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c68d2a87 TL |
1 | /* failover.c |
2 | ||
3 | Failover protocol support code... */ | |
4 | ||
5 | /* | |
6ec59010 | 6 | * Copyright (c) 2004-2017 by Internet Systems Consortium, Inc. ("ISC") |
98311e4b | 7 | * Copyright (c) 1999-2003 by Internet Software Consortium |
c68d2a87 | 8 | * |
7512d88b TM |
9 | * This Source Code Form is subject to the terms of the Mozilla Public |
10 | * License, v. 2.0. If a copy of the MPL was not distributed with this | |
11 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. | |
c68d2a87 | 12 | * |
98311e4b DH |
13 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
14 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
15 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR | |
16 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
17 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
18 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
19 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
c68d2a87 | 20 | * |
98311e4b DH |
21 | * Internet Systems Consortium, Inc. |
22 | * 950 Charter Street | |
23 | * Redwood City, CA 94063 | |
24 | * <info@isc.org> | |
2c85ac9b | 25 | * https://www.isc.org/ |
49733f31 | 26 | * |
c68d2a87 TL |
27 | */ |
28 | ||
dd9237c3 | 29 | #include "cdefs.h" |
c68d2a87 | 30 | #include "dhcpd.h" |
d9eefc5d | 31 | #include <omapip/omapip_p.h> |
c68d2a87 TL |
32 | |
33 | #if defined (FAILOVER_PROTOCOL) | |
d758ad8c | 34 | dhcp_failover_state_t *failover_states; |
d9eefc5d | 35 | static isc_result_t do_a_failover_option (omapi_object_t *, |
d50d0b82 | 36 | dhcp_failover_link_t *); |
02ca1b45 | 37 | dhcp_failover_listener_t *failover_listeners; |
c68d2a87 | 38 | |
988c1ca7 DN |
39 | static isc_result_t failover_message_reference (failover_message_t **, |
40 | failover_message_t *, | |
41 | const char *file, int line); | |
42 | static isc_result_t failover_message_dereference (failover_message_t **, | |
43 | const char *file, int line); | |
44 | ||
fc3b9c90 | 45 | static void dhcp_failover_pool_balance(dhcp_failover_state_t *state); |
2426234f | 46 | static void dhcp_failover_pool_reqbalance(dhcp_failover_state_t *state); |
f71bc988 DH |
47 | static int dhcp_failover_pool_dobalance(dhcp_failover_state_t *state, |
48 | isc_boolean_t *sendreq); | |
a34feb7d | 49 | static inline int secondary_not_hoarding(dhcp_failover_state_t *state, |
2426234f | 50 | struct pool *p); |
09dccd03 | 51 | static void scrub_lease(struct lease* lease, const char *file, int line); |
2426234f | 52 | |
30593241 | 53 | int check_secs_byte_order = 0; /* enables byte order check of secs field if 1 */ |
2426234f | 54 | |
6ec59010 TM |
55 | /*! |
56 | * \brief Performs a "pre-flight" sanity check of failover configuration | |
57 | * | |
58 | * Provides an opportunity to do post-parse pre-startup sanity checking | |
59 | * of failover configuration. This allows checks to be done under test | |
60 | * mode (-T), without requiring full startup for validation. | |
61 | * | |
62 | * Currently, it enforces all failover peers be used in at lease one | |
63 | * pool. This logic was formerly located in dhcp_failover_startup. | |
64 | * | |
65 | * On failure, a fatal error is logged. | |
66 | * | |
67 | */ | |
68 | void dhcp_failover_sanity_check() { | |
69 | dhcp_failover_state_t *state; | |
70 | int fail_count = 0; | |
71 | ||
72 | for (state = failover_states; state; state = state->next) { | |
73 | if (state->pool_count == 0) { | |
74 | log_error ("ERROR: Failover peer, %s, has no referring" | |
75 | " pools. You must refer to each peer in at" | |
76 | " least one pool declaration.", | |
77 | state->name); | |
78 | fail_count++; | |
79 | } | |
3e985dbf TM |
80 | |
81 | if (state->load_balance_max_secs == 0) { | |
82 | log_info ("WARNING: load balancing will be disabled " | |
83 | "for failover peer, %s, " | |
84 | "because its load balance max secs is 0", | |
85 | state->name); | |
86 | } | |
6ec59010 TM |
87 | } |
88 | ||
89 | if (fail_count) { | |
90 | log_fatal ("Failover configuration sanity check failed"); | |
91 | } | |
3e985dbf | 92 | |
6ec59010 TM |
93 | } |
94 | ||
85a53735 TL |
95 | void dhcp_failover_startup () |
96 | { | |
97 | dhcp_failover_state_t *state; | |
98 | isc_result_t status; | |
be62cf06 | 99 | struct timeval tv; |
85a53735 TL |
100 | |
101 | for (state = failover_states; state; state = state -> next) { | |
9f3da356 | 102 | dhcp_failover_state_transition (state, "startup"); |
02ca1b45 TL |
103 | /* In case the peer is already running, immediately try |
104 | to establish a connection with it. */ | |
8998f8df | 105 | status = dhcp_failover_link_initiate ((omapi_object_t *)state); |
98bf1607 | 106 | if (status != ISC_R_SUCCESS && status != DHCP_R_INCOMPLETE) { |
0db87765 TL |
107 | #if defined (DEBUG_FAILOVER_TIMING) |
108 | log_info ("add_timeout +90 dhcp_failover_reconnect"); | |
109 | #endif | |
be62cf06 FD |
110 | tv . tv_sec = cur_time + 90; |
111 | tv . tv_usec = 0; | |
112 | add_timeout (&tv, | |
02ca1b45 TL |
113 | dhcp_failover_reconnect, state, |
114 | (tvref_t) | |
115 | dhcp_failover_state_reference, | |
116 | (tvunref_t) | |
117 | dhcp_failover_state_dereference); | |
85a53735 TL |
118 | log_error ("failover peer %s: %s", state -> name, |
119 | isc_result_totext (status)); | |
120 | } | |
02ca1b45 TL |
121 | |
122 | status = (dhcp_failover_listen | |
123 | ((omapi_object_t *)state)); | |
124 | if (status != ISC_R_SUCCESS) { | |
0db87765 TL |
125 | #if defined (DEBUG_FAILOVER_TIMING) |
126 | log_info ("add_timeout +90 %s", | |
127 | "dhcp_failover_listener_restart"); | |
128 | #endif | |
be62cf06 FD |
129 | tv . tv_sec = cur_time + 90; |
130 | tv . tv_usec = 0; | |
131 | add_timeout (&tv, | |
02ca1b45 TL |
132 | dhcp_failover_listener_restart, |
133 | state, | |
134 | (tvref_t)omapi_object_reference, | |
135 | (tvunref_t)omapi_object_dereference); | |
136 | } | |
85a53735 TL |
137 | } |
138 | } | |
139 | ||
d758ad8c | 140 | int dhcp_failover_write_all_states () |
9f3da356 TL |
141 | { |
142 | dhcp_failover_state_t *state; | |
143 | ||
144 | for (state = failover_states; state; state = state -> next) { | |
d758ad8c TL |
145 | if (!write_failover_state (state)) |
146 | return 0; | |
9f3da356 | 147 | } |
d758ad8c | 148 | return 1; |
9f3da356 TL |
149 | } |
150 | ||
85a53735 | 151 | isc_result_t enter_failover_peer (peer) |
dd53dc5a | 152 | dhcp_failover_state_t *peer; |
c68d2a87 | 153 | { |
85a53735 TL |
154 | dhcp_failover_state_t *dup = (dhcp_failover_state_t *)0; |
155 | isc_result_t status; | |
156 | ||
20916cae | 157 | status = find_failover_peer (&dup, peer -> name, MDL); |
85a53735 TL |
158 | if (status == ISC_R_NOTFOUND) { |
159 | if (failover_states) { | |
20916cae TL |
160 | dhcp_failover_state_reference (&peer -> next, |
161 | failover_states, MDL); | |
162 | dhcp_failover_state_dereference (&failover_states, | |
163 | MDL); | |
85a53735 | 164 | } |
20916cae | 165 | dhcp_failover_state_reference (&failover_states, peer, MDL); |
85a53735 TL |
166 | return ISC_R_SUCCESS; |
167 | } | |
20916cae | 168 | dhcp_failover_state_dereference (&dup, MDL); |
85a53735 TL |
169 | if (status == ISC_R_SUCCESS) |
170 | return ISC_R_EXISTS; | |
85a53735 | 171 | return status; |
c68d2a87 TL |
172 | } |
173 | ||
20916cae | 174 | isc_result_t find_failover_peer (peer, name, file, line) |
dd53dc5a | 175 | dhcp_failover_state_t **peer; |
85a53735 | 176 | const char *name; |
20916cae TL |
177 | const char *file; |
178 | int line; | |
c68d2a87 | 179 | { |
dd53dc5a | 180 | dhcp_failover_state_t *p; |
c68d2a87 | 181 | |
dd53dc5a TL |
182 | for (p = failover_states; p; p = p -> next) |
183 | if (!strcmp (name, p -> name)) | |
184 | break; | |
185 | if (p) | |
20916cae | 186 | return dhcp_failover_state_reference (peer, p, file, line); |
dd53dc5a | 187 | return ISC_R_NOTFOUND; |
c68d2a87 TL |
188 | } |
189 | ||
d50d0b82 TL |
190 | /* The failover protocol has three objects associated with it. For |
191 | each failover partner declaration in the dhcpd.conf file, primary | |
192 | or secondary, there is a failover_state object. For any primary or | |
193 | secondary state object that has a connection to its peer, there is | |
c57db45c | 194 | also a failover_link object, which has its own input state separate |
d50d0b82 TL |
195 | from the failover protocol state for managing the actual bytes |
196 | coming in off the wire. Finally, there will be one listener object | |
197 | for every distinct port number associated with a secondary | |
198 | failover_state object. Normally all secondary failover_state | |
199 | objects are expected to listen on the same port number, so there | |
200 | need be only one listener object, but if different port numbers are | |
201 | specified for each failover object, there could be as many as one | |
202 | listener object for each secondary failover_state object. */ | |
203 | ||
20ae1aff | 204 | /* This, then, is the implementation of the failover link object. */ |
d50d0b82 TL |
205 | |
206 | isc_result_t dhcp_failover_link_initiate (omapi_object_t *h) | |
207 | { | |
208 | isc_result_t status; | |
209 | dhcp_failover_link_t *obj; | |
dd53dc5a TL |
210 | dhcp_failover_state_t *state; |
211 | omapi_object_t *o; | |
212 | int i; | |
213 | struct data_string ds; | |
85a53735 TL |
214 | omapi_addr_list_t *addrs = (omapi_addr_list_t *)0; |
215 | omapi_addr_t local_addr; | |
d50d0b82 | 216 | |
dd53dc5a TL |
217 | /* Find the failover state in the object chain. */ |
218 | for (o = h; o -> outer; o = o -> outer) | |
219 | ; | |
220 | for (; o; o = o -> inner) { | |
221 | if (o -> type == dhcp_type_failover_state) | |
222 | break; | |
d9eefc5d | 223 | } |
dd53dc5a | 224 | if (!o) |
98bf1607 | 225 | return DHCP_R_INVALIDARG; |
dd53dc5a | 226 | state = (dhcp_failover_state_t *)o; |
d50d0b82 | 227 | |
20916cae TL |
228 | obj = (dhcp_failover_link_t *)0; |
229 | status = dhcp_failover_link_allocate (&obj, MDL); | |
230 | if (status != ISC_R_SUCCESS) | |
231 | return status; | |
02ca1b45 TL |
232 | option_cache_reference (&obj -> peer_address, |
233 | state -> partner.address, MDL); | |
234 | obj -> peer_port = state -> partner.port; | |
20916cae | 235 | dhcp_failover_state_reference (&obj -> state_object, state, MDL); |
dd53dc5a TL |
236 | |
237 | memset (&ds, 0, sizeof ds); | |
238 | if (!evaluate_option_cache (&ds, (struct packet *)0, (struct lease *)0, | |
9e383163 | 239 | (struct client_state *)0, |
dd53dc5a TL |
240 | (struct option_state *)0, |
241 | (struct option_state *)0, | |
4bd8800e | 242 | &global_scope, obj -> peer_address, MDL)) { |
20916cae | 243 | dhcp_failover_link_dereference (&obj, MDL); |
dd53dc5a | 244 | return ISC_R_UNEXPECTED; |
d50d0b82 | 245 | } |
dd53dc5a | 246 | |
85a53735 TL |
247 | /* Make an omapi address list out of a buffer containing zero or more |
248 | IPv4 addresses. */ | |
249 | status = omapi_addr_list_new (&addrs, ds.len / 4, MDL); | |
250 | if (status != ISC_R_SUCCESS) { | |
20916cae | 251 | dhcp_failover_link_dereference (&obj, MDL); |
85a53735 TL |
252 | return status; |
253 | } | |
254 | ||
255 | for (i = 0; i < addrs -> count; i++) { | |
256 | addrs -> addresses [i].addrtype = AF_INET; | |
257 | addrs -> addresses [i].addrlen = sizeof (struct in_addr); | |
258 | memcpy (addrs -> addresses [i].address, | |
259 | &ds.data [i * 4], sizeof (struct in_addr)); | |
260 | addrs -> addresses [i].port = obj -> peer_port; | |
dd53dc5a | 261 | } |
4bd8800e | 262 | data_string_forget (&ds, MDL); |
dd53dc5a | 263 | |
85a53735 | 264 | /* Now figure out the local address that we're supposed to use. */ |
de8dfadf TL |
265 | if (!state -> me.address || |
266 | !evaluate_option_cache (&ds, (struct packet *)0, | |
267 | (struct lease *)0, | |
9e383163 | 268 | (struct client_state *)0, |
85a53735 TL |
269 | (struct option_state *)0, |
270 | (struct option_state *)0, | |
02ca1b45 | 271 | &global_scope, state -> me.address, |
85a53735 TL |
272 | MDL)) { |
273 | memset (&local_addr, 0, sizeof local_addr); | |
274 | local_addr.addrtype = AF_INET; | |
275 | local_addr.addrlen = sizeof (struct in_addr); | |
9f3da356 | 276 | if (!state -> server_identifier.len) { |
a609e69b | 277 | log_fatal ("failover peer %s: no local address.", |
9f3da356 TL |
278 | state -> name); |
279 | } | |
85a53735 TL |
280 | } else { |
281 | if (ds.len != sizeof (struct in_addr)) { | |
41d4652f DH |
282 | log_error("failover peer %s: 'address' parameter " |
283 | "fails to resolve to an IPv4 address", | |
284 | state->name); | |
85a53735 | 285 | data_string_forget (&ds, MDL); |
20916cae | 286 | dhcp_failover_link_dereference (&obj, MDL); |
85a53735 | 287 | omapi_addr_list_dereference (&addrs, MDL); |
98bf1607 | 288 | return DHCP_R_INVALIDARG; |
85a53735 TL |
289 | } |
290 | local_addr.addrtype = AF_INET; | |
291 | local_addr.addrlen = ds.len; | |
292 | memcpy (local_addr.address, ds.data, ds.len); | |
9f3da356 TL |
293 | if (!state -> server_identifier.len) |
294 | data_string_copy (&state -> server_identifier, | |
295 | &ds, MDL); | |
85a53735 | 296 | data_string_forget (&ds, MDL); |
9f3da356 | 297 | local_addr.port = 0; /* Let the O.S. choose. */ |
85a53735 TL |
298 | } |
299 | ||
300 | status = omapi_connect_list ((omapi_object_t *)obj, | |
301 | addrs, &local_addr); | |
302 | omapi_addr_list_dereference (&addrs, MDL); | |
303 | ||
20916cae TL |
304 | dhcp_failover_link_dereference (&obj, MDL); |
305 | return status; | |
d50d0b82 TL |
306 | } |
307 | ||
308 | isc_result_t dhcp_failover_link_signal (omapi_object_t *h, | |
309 | const char *name, va_list ap) | |
310 | { | |
311 | isc_result_t status; | |
312 | dhcp_failover_link_t *link; | |
313 | omapi_object_t *c; | |
9f3da356 | 314 | dhcp_failover_state_t *s, *state = (dhcp_failover_state_t *)0; |
fa9b593d DH |
315 | char *sname; |
316 | int slen; | |
be62cf06 | 317 | struct timeval tv; |
d50d0b82 TL |
318 | |
319 | if (h -> type != dhcp_type_failover_link) { | |
320 | /* XXX shouldn't happen. Put an assert here? */ | |
321 | return ISC_R_UNEXPECTED; | |
322 | } | |
323 | link = (dhcp_failover_link_t *)h; | |
324 | ||
85a53735 | 325 | if (!strcmp (name, "connect")) { |
02ca1b45 | 326 | if (link -> state_object -> i_am == primary) { |
85a53735 | 327 | status = dhcp_failover_send_connect (h); |
02ca1b45 TL |
328 | if (status != ISC_R_SUCCESS) { |
329 | log_info ("dhcp_failover_send_connect: %s", | |
330 | isc_result_totext (status)); | |
331 | omapi_disconnect (h -> outer, 1); | |
332 | } | |
da292833 TL |
333 | } else |
334 | status = ISC_R_SUCCESS; | |
335 | /* Allow the peer fifteen seconds to send us a | |
336 | startup message. */ | |
0db87765 TL |
337 | #if defined (DEBUG_FAILOVER_TIMING) |
338 | log_info ("add_timeout +15 %s", | |
339 | "dhcp_failover_link_startup_timeout"); | |
340 | #endif | |
be62cf06 FD |
341 | tv . tv_sec = cur_time + 15; |
342 | tv . tv_usec = 0; | |
343 | add_timeout (&tv, | |
da292833 TL |
344 | dhcp_failover_link_startup_timeout, |
345 | link, | |
346 | (tvref_t)dhcp_failover_link_reference, | |
347 | (tvunref_t)dhcp_failover_link_dereference); | |
348 | return status; | |
85a53735 TL |
349 | } |
350 | ||
9f3da356 | 351 | if (!strcmp (name, "disconnect")) { |
da292833 | 352 | if (link -> state_object) { |
db6960a7 TL |
353 | dhcp_failover_state_reference (&state, |
354 | link -> state_object, MDL); | |
e651f9b2 | 355 | link -> state = dhcp_flink_disconnected; |
db6960a7 | 356 | |
e651f9b2 | 357 | /* Make the transition. */ |
350576c5 DH |
358 | if (state->link_to_peer == link) |
359 | dhcp_failover_state_transition(link->state_object, name); | |
db6960a7 | 360 | |
350576c5 | 361 | /* Schedule an attempt to reconnect. */ |
0db87765 | 362 | #if defined (DEBUG_FAILOVER_TIMING) |
350576c5 | 363 | log_info("add_timeout +5 dhcp_failover_reconnect"); |
0db87765 | 364 | #endif |
350576c5 DH |
365 | tv.tv_sec = cur_time + 5; |
366 | tv.tv_usec = cur_tv.tv_usec; | |
367 | add_timeout(&tv, dhcp_failover_reconnect, state, | |
368 | (tvref_t)dhcp_failover_state_reference, | |
369 | (tvunref_t)dhcp_failover_state_dereference); | |
370 | ||
380da6c0 | 371 | dhcp_failover_state_dereference (&state, MDL); |
e651f9b2 TL |
372 | } |
373 | return ISC_R_SUCCESS; | |
9f3da356 TL |
374 | } |
375 | ||
98311e4b DH |
376 | if (!strcmp (name, "status")) { |
377 | if (link -> state_object) { | |
378 | isc_result_t status; | |
379 | ||
380 | status = va_arg(ap, isc_result_t); | |
381 | ||
382 | if ((status == ISC_R_HOSTUNREACH) || (status == ISC_R_TIMEDOUT)) { | |
383 | dhcp_failover_state_reference (&state, | |
384 | link -> state_object, MDL); | |
385 | link -> state = dhcp_flink_disconnected; | |
386 | ||
387 | /* Make the transition. */ | |
388 | dhcp_failover_state_transition (link -> state_object, | |
389 | "disconnect"); | |
390 | ||
391 | /* Start trying to reconnect. */ | |
392 | #if defined (DEBUG_FAILOVER_TIMING) | |
393 | log_info ("add_timeout +5 %s", | |
394 | "dhcp_failover_reconnect"); | |
395 | #endif | |
be62cf06 FD |
396 | tv . tv_sec = cur_time + 5; |
397 | tv . tv_usec = 0; | |
398 | add_timeout (&tv, dhcp_failover_reconnect, | |
98311e4b DH |
399 | state, |
400 | (tvref_t)dhcp_failover_state_reference, | |
401 | (tvunref_t)dhcp_failover_state_dereference); | |
402 | } | |
403 | dhcp_failover_state_dereference (&state, MDL); | |
404 | } | |
405 | return ISC_R_SUCCESS; | |
406 | } | |
407 | ||
d50d0b82 TL |
408 | /* Not a signal we recognize? */ |
409 | if (strcmp (name, "ready")) { | |
d9eefc5d | 410 | if (h -> inner && h -> inner -> type -> signal_handler) |
9f3da356 TL |
411 | return (*(h -> inner -> type -> signal_handler)) |
412 | (h -> inner, name, ap); | |
d50d0b82 TL |
413 | return ISC_R_NOTFOUND; |
414 | } | |
415 | ||
d9eefc5d | 416 | if (!h -> outer || h -> outer -> type != omapi_type_connection) |
98bf1607 | 417 | return DHCP_R_INVALIDARG; |
d9eefc5d | 418 | c = h -> outer; |
d50d0b82 TL |
419 | |
420 | /* We get here because we requested that we be woken up after | |
421 | some number of bytes were read, and that number of bytes | |
422 | has in fact been read. */ | |
d9eefc5d | 423 | switch (link -> state) { |
d50d0b82 | 424 | case dhcp_flink_start: |
d9eefc5d | 425 | link -> state = dhcp_flink_message_length_wait; |
d50d0b82 TL |
426 | if ((omapi_connection_require (c, 2)) != ISC_R_SUCCESS) |
427 | break; | |
428 | case dhcp_flink_message_length_wait: | |
25a69ca1 | 429 | next_message: |
d9eefc5d | 430 | link -> state = dhcp_flink_message_wait; |
4bd8800e | 431 | link -> imsg = dmalloc (sizeof (failover_message_t), MDL); |
d9eefc5d | 432 | if (!link -> imsg) { |
988c1ca7 | 433 | status = ISC_R_NOMEMORY; |
d50d0b82 | 434 | dhcp_flink_fail: |
d9eefc5d | 435 | if (link -> imsg) { |
988c1ca7 DN |
436 | failover_message_dereference (&link->imsg, |
437 | MDL); | |
d9eefc5d | 438 | } |
d50d0b82 | 439 | link -> state = dhcp_flink_disconnected; |
988c1ca7 DN |
440 | log_info ("message length wait: %s", |
441 | isc_result_totext (status)); | |
d50d0b82 TL |
442 | omapi_disconnect (c, 1); |
443 | /* XXX just blow away the protocol state now? | |
444 | XXX or will disconnect blow it away? */ | |
445 | return ISC_R_UNEXPECTED; | |
446 | } | |
25a69ca1 | 447 | memset (link -> imsg, 0, sizeof (failover_message_t)); |
fa0b4709 | 448 | link -> imsg -> refcnt = 1; |
d9eefc5d TL |
449 | /* Get the length: */ |
450 | omapi_connection_get_uint16 (c, &link -> imsg_len); | |
451 | link -> imsg_count = 0; /* Bytes read. */ | |
a55ccdd0 DH |
452 | |
453 | /* Ensure the message is of valid length. */ | |
454 | if (link->imsg_len < DHCP_FAILOVER_MIN_MESSAGE_SIZE || | |
455 | link->imsg_len > DHCP_FAILOVER_MAX_MESSAGE_SIZE) { | |
988c1ca7 | 456 | status = ISC_R_UNEXPECTED; |
d9eefc5d | 457 | goto dhcp_flink_fail; |
988c1ca7 | 458 | } |
d50d0b82 | 459 | |
9f3da356 | 460 | if ((omapi_connection_require (c, link -> imsg_len - 2U)) != |
d50d0b82 TL |
461 | ISC_R_SUCCESS) |
462 | break; | |
463 | case dhcp_flink_message_wait: | |
464 | /* Read in the message. At this point we have the | |
465 | entire message in the input buffer. For each | |
466 | incoming value ID, set a bit in the bitmask | |
467 | indicating that we've gotten it. Maybe flag an | |
468 | error message if the bit is already set. Once | |
469 | we're done reading, we can check the bitmask to | |
470 | make sure that the required fields for each message | |
471 | have been included. */ | |
472 | ||
473 | link -> imsg_count += 2; /* Count the length as read. */ | |
474 | ||
475 | /* Get message type. */ | |
476 | omapi_connection_copyout (&link -> imsg -> type, c, 1); | |
477 | link -> imsg_count++; | |
478 | ||
479 | /* Get message payload offset. */ | |
480 | omapi_connection_copyout (&link -> imsg_payoff, c, 1); | |
481 | link -> imsg_count++; | |
482 | ||
483 | /* Get message time. */ | |
484 | omapi_connection_get_uint32 (c, &link -> imsg -> time); | |
485 | link -> imsg_count += 4; | |
486 | ||
487 | /* Get transaction ID. */ | |
488 | omapi_connection_get_uint32 (c, &link -> imsg -> xid); | |
489 | link -> imsg_count += 4; | |
490 | ||
02ca1b45 | 491 | #if defined (DEBUG_FAILOVER_MESSAGES) |
1387545f DH |
492 | # if !defined(DEBUG_FAILOVER_CONTACT_MESSAGES) |
493 | if (link->imsg->type == FTM_CONTACT) | |
494 | goto skip_contact; | |
495 | # endif | |
02ca1b45 TL |
496 | log_info ("link: message %s payoff %d time %ld xid %ld", |
497 | dhcp_failover_message_name (link -> imsg -> type), | |
498 | link -> imsg_payoff, | |
499 | (unsigned long)link -> imsg -> time, | |
500 | (unsigned long)link -> imsg -> xid); | |
1387545f DH |
501 | # if !defined(DEBUG_FAILOVER_CONTACT_MESSAGES) |
502 | skip_contact: | |
503 | # endif | |
02ca1b45 | 504 | #endif |
d50d0b82 TL |
505 | /* Skip over any portions of the message header that we |
506 | don't understand. */ | |
d9eefc5d | 507 | if (link -> imsg_payoff - link -> imsg_count) { |
d50d0b82 | 508 | omapi_connection_copyout ((unsigned char *)0, c, |
d9eefc5d | 509 | (link -> imsg_payoff - |
d50d0b82 | 510 | link -> imsg_count)); |
d9eefc5d | 511 | link -> imsg_count = link -> imsg_payoff; |
d50d0b82 | 512 | } |
6ec59010 | 513 | |
d50d0b82 TL |
514 | /* Now start sucking options off the wire. */ |
515 | while (link -> imsg_count < link -> imsg_len) { | |
988c1ca7 DN |
516 | status = do_a_failover_option (c, link); |
517 | if (status != ISC_R_SUCCESS) | |
d50d0b82 TL |
518 | goto dhcp_flink_fail; |
519 | } | |
520 | ||
9f3da356 TL |
521 | /* If it's a connect message, try to associate it with |
522 | a state object. */ | |
523 | /* XXX this should be authenticated! */ | |
524 | if (link -> imsg -> type == FTM_CONNECT) { | |
007e3ee4 TL |
525 | const char *errmsg; |
526 | int reason; | |
a55ccdd0 DH |
527 | |
528 | if (!(link->imsg->options_present & | |
529 | FTB_RELATIONSHIP_NAME)) { | |
530 | errmsg = "missing relationship-name"; | |
531 | reason = FTR_INVALID_PARTNER; | |
532 | goto badconnect; | |
533 | } | |
534 | ||
9f3da356 TL |
535 | /* See if we can find a failover_state object that |
536 | matches this connection. This message should only | |
537 | be received by a secondary from a primary. */ | |
538 | for (s = failover_states; s; s = s -> next) { | |
a55ccdd0 DH |
539 | if (dhcp_failover_state_match_by_name(s, |
540 | &link->imsg->relationship_name)) | |
9f3da356 | 541 | state = s; |
fa9b593d | 542 | } |
9f3da356 TL |
543 | |
544 | /* If we can't find a failover protocol state | |
545 | for this remote host, drop the connection */ | |
546 | if (!state) { | |
fa9b593d | 547 | errmsg = "unknown failover relationship name"; |
007e3ee4 TL |
548 | reason = FTR_INVALID_PARTNER; |
549 | ||
550 | badconnect: | |
9f3da356 TL |
551 | /* XXX Send a refusal message first? |
552 | XXX Look in protocol spec for guidance. */ | |
fa9b593d DH |
553 | |
554 | if (state != NULL) { | |
555 | sname = state->name; | |
556 | slen = strlen(sname); | |
557 | } else if (link->imsg->options_present & | |
558 | FTB_RELATIONSHIP_NAME) { | |
d7ec175b SK |
559 | sname = (char *)link->imsg-> |
560 | relationship_name.data; | |
fa9b593d DH |
561 | slen = link->imsg->relationship_name.count; |
562 | } else { | |
563 | sname = "unknown"; | |
564 | slen = strlen(sname); | |
565 | } | |
566 | ||
567 | log_error("Failover CONNECT from %.*s: %s", | |
568 | slen, sname, errmsg); | |
9f3da356 | 569 | dhcp_failover_send_connectack |
007e3ee4 TL |
570 | ((omapi_object_t *)link, state, |
571 | reason, errmsg); | |
02ca1b45 | 572 | log_info ("failover: disconnect: %s", errmsg); |
9f3da356 | 573 | omapi_disconnect (c, 0); |
25a69ca1 | 574 | link -> state = dhcp_flink_disconnected; |
9f3da356 TL |
575 | return ISC_R_SUCCESS; |
576 | } | |
577 | ||
d758ad8c TL |
578 | if ((cur_time > link -> imsg -> time && |
579 | cur_time - link -> imsg -> time > 60) || | |
580 | (cur_time < link -> imsg -> time && | |
581 | link -> imsg -> time - cur_time > 60)) { | |
582 | errmsg = "time offset too large"; | |
583 | reason = FTR_TIMEMISMATCH; | |
584 | goto badconnect; | |
585 | } | |
586 | ||
007e3ee4 TL |
587 | if (!(link -> imsg -> options_present & FTB_HBA) || |
588 | link -> imsg -> hba.count != 32) { | |
589 | errmsg = "invalid HBA"; | |
590 | reason = FTR_HBA_CONFLICT; /* XXX */ | |
591 | goto badconnect; | |
592 | } | |
593 | if (state -> hba) | |
594 | dfree (state -> hba, MDL); | |
595 | state -> hba = dmalloc (32, MDL); | |
596 | if (!state -> hba) { | |
597 | errmsg = "no memory"; | |
598 | reason = FTR_MISC_REJECT; | |
599 | goto badconnect; | |
600 | } | |
601 | memcpy (state -> hba, link -> imsg -> hba.data, 32); | |
602 | ||
9f3da356 | 603 | if (!link -> state_object) |
20916cae TL |
604 | dhcp_failover_state_reference |
605 | (&link -> state_object, state, MDL); | |
02ca1b45 TL |
606 | if (!link -> peer_address) |
607 | option_cache_reference | |
608 | (&link -> peer_address, | |
609 | state -> partner.address, MDL); | |
9f3da356 TL |
610 | } |
611 | ||
612 | /* If we don't have a state object at this point, it's | |
613 | some kind of bogus situation, so just drop the | |
614 | connection. */ | |
615 | if (!link -> state_object) { | |
02ca1b45 | 616 | log_info ("failover: connect: no matching state."); |
9f3da356 | 617 | omapi_disconnect (c, 1); |
25a69ca1 | 618 | link -> state = dhcp_flink_disconnected; |
98bf1607 | 619 | return DHCP_R_INVALIDARG; |
9f3da356 TL |
620 | } |
621 | ||
d50d0b82 TL |
622 | /* Once we have the entire message, and we've validated |
623 | it as best we can here, pass it to the parent. */ | |
9f3da356 TL |
624 | omapi_signal ((omapi_object_t *)link -> state_object, |
625 | "message", link); | |
25a69ca1 | 626 | link -> state = dhcp_flink_message_length_wait; |
d453265f PS |
627 | if (link -> imsg) |
628 | failover_message_dereference (&link -> imsg, MDL); | |
25a69ca1 TL |
629 | /* XXX This is dangerous because we could get into a tight |
630 | XXX loop reading input without servicing any other stuff. | |
631 | XXX There needs to be a way to relinquish control but | |
632 | XXX get it back immediately if there's no other work to | |
633 | XXX do. */ | |
634 | if ((omapi_connection_require (c, 2)) == ISC_R_SUCCESS) | |
635 | goto next_message; | |
d50d0b82 TL |
636 | break; |
637 | ||
638 | default: | |
fa9b593d | 639 | log_fatal("Impossible case at %s:%d.", MDL); |
d50d0b82 TL |
640 | break; |
641 | } | |
642 | return ISC_R_SUCCESS; | |
643 | } | |
644 | ||
645 | static isc_result_t do_a_failover_option (c, link) | |
d9eefc5d | 646 | omapi_object_t *c; |
d50d0b82 TL |
647 | dhcp_failover_link_t *link; |
648 | { | |
649 | u_int16_t option_code; | |
650 | u_int16_t option_len; | |
d9eefc5d TL |
651 | unsigned char *op; |
652 | unsigned op_size; | |
653 | unsigned op_count; | |
654 | int i; | |
6ec59010 | 655 | |
d50d0b82 TL |
656 | if (link -> imsg_count + 2 > link -> imsg_len) { |
657 | log_error ("FAILOVER: message overflow at option code."); | |
98bf1607 | 658 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 TL |
659 | } |
660 | ||
e1b18c69 TM |
661 | if (link->imsg->type > FTM_MAX) { |
662 | log_error ("FAILOVER: invalid message type: %d", | |
663 | link->imsg->type); | |
664 | return DHCP_R_PROTOCOLERROR; | |
665 | } | |
666 | ||
d50d0b82 TL |
667 | /* Get option code. */ |
668 | omapi_connection_get_uint16 (c, &option_code); | |
669 | link -> imsg_count += 2; | |
6ec59010 | 670 | |
9f3da356 TL |
671 | if (link -> imsg_count + 2 > link -> imsg_len) { |
672 | log_error ("FAILOVER: message overflow at length."); | |
98bf1607 | 673 | return DHCP_R_PROTOCOLERROR; |
9f3da356 TL |
674 | } |
675 | ||
d50d0b82 TL |
676 | /* Get option length. */ |
677 | omapi_connection_get_uint16 (c, &option_len); | |
678 | link -> imsg_count += 2; | |
679 | ||
680 | if (link -> imsg_count + option_len > link -> imsg_len) { | |
9f3da356 | 681 | log_error ("FAILOVER: message overflow at data."); |
98bf1607 | 682 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 TL |
683 | } |
684 | ||
685 | /* If it's an unknown code, skip over it. */ | |
ffdf3c8c DH |
686 | if ((option_code > FTO_MAX) || |
687 | (ft_options[option_code].type == FT_UNDEF)) { | |
02ca1b45 TL |
688 | #if defined (DEBUG_FAILOVER_MESSAGES) |
689 | log_debug (" option code %d (%s) len %d (not recognized)", | |
690 | option_code, | |
691 | dhcp_failover_option_name (option_code), | |
692 | option_len); | |
d50d0b82 TL |
693 | #endif |
694 | omapi_connection_copyout ((unsigned char *)0, c, option_len); | |
d9eefc5d | 695 | link -> imsg_count += option_len; |
d50d0b82 TL |
696 | return ISC_R_SUCCESS; |
697 | } | |
698 | ||
699 | /* If it's the digest, do it now. */ | |
700 | if (ft_options [option_code].type == FT_DIGEST) { | |
701 | link -> imsg_count += option_len; | |
702 | if (link -> imsg_count != link -> imsg_len) { | |
703 | log_error ("FAILOVER: digest not at end of message"); | |
98bf1607 | 704 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 | 705 | } |
02ca1b45 | 706 | #if defined (DEBUG_FAILOVER_MESSAGES) |
d50d0b82 TL |
707 | log_debug (" option %s len %d", |
708 | ft_options [option_code].name, option_len); | |
709 | #endif | |
710 | /* For now, just dump it. */ | |
711 | omapi_connection_copyout ((unsigned char *)0, c, option_len); | |
712 | return ISC_R_SUCCESS; | |
713 | } | |
6ec59010 | 714 | |
d50d0b82 | 715 | /* Only accept an option once. */ |
d9eefc5d | 716 | if (link -> imsg -> options_present & ft_options [option_code].bit) { |
d50d0b82 TL |
717 | log_error ("FAILOVER: duplicate option %s", |
718 | ft_options [option_code].name); | |
98bf1607 | 719 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 TL |
720 | } |
721 | ||
722 | /* Make sure the option is appropriate for this type of message. | |
723 | Really, any option is generally allowed for any message, and the | |
724 | cases where this is not true are too complicated to represent in | |
725 | this way - what this code is doing is to just avoid saving the | |
726 | value of an option we don't have any way to use, which allows | |
727 | us to make the failover_message structure smaller. */ | |
728 | if (ft_options [option_code].bit && | |
9f3da356 TL |
729 | !(fto_allowed [link -> imsg -> type] & |
730 | ft_options [option_code].bit)) { | |
d50d0b82 | 731 | omapi_connection_copyout ((unsigned char *)0, c, option_len); |
d9eefc5d | 732 | link -> imsg_count += option_len; |
d50d0b82 | 733 | return ISC_R_SUCCESS; |
6ec59010 | 734 | } |
d50d0b82 TL |
735 | |
736 | /* Figure out how many elements, how big they are, and where | |
737 | to store them. */ | |
738 | if (ft_options [option_code].num_present) { | |
739 | /* If this option takes a fixed number of elements, | |
740 | we expect the space for them to be preallocated, | |
741 | and we can just read the data in. */ | |
742 | ||
9f3da356 | 743 | op = ((unsigned char *)link -> imsg) + |
d9eefc5d | 744 | ft_options [option_code].offset; |
d50d0b82 TL |
745 | op_size = ft_sizes [ft_options [option_code].type]; |
746 | op_count = ft_options [option_code].num_present; | |
747 | ||
d9eefc5d | 748 | if (option_len != op_size * op_count) { |
d50d0b82 | 749 | log_error ("FAILOVER: option size (%d:%d), option %s", |
d9eefc5d | 750 | option_len, |
d50d0b82 TL |
751 | (ft_sizes [ft_options [option_code].type] * |
752 | ft_options [option_code].num_present), | |
753 | ft_options [option_code].name); | |
98bf1607 | 754 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 TL |
755 | } |
756 | } else { | |
d9eefc5d | 757 | failover_option_t *fo; |
d50d0b82 TL |
758 | |
759 | /* FT_DDNS* are special - one or two bytes of status | |
760 | followed by the client FQDN. */ | |
6ec59010 | 761 | |
a07d99bb TM |
762 | /* Note: FT_DDNS* option support appears to be incomplete. |
763 | ISC-Bugs #36996 has been opened to address this. */ | |
764 | if (ft_options [option_code].type == FT_DDNS || | |
d50d0b82 | 765 | ft_options [option_code].type == FT_DDNS1) { |
d9eefc5d TL |
766 | ddns_fqdn_t *ddns = |
767 | ((ddns_fqdn_t *) | |
007e3ee4 | 768 | (((char *)link -> imsg) + |
d50d0b82 TL |
769 | ft_options [option_code].offset)); |
770 | ||
771 | op_count = (ft_options [option_code].type == FT_DDNS1 | |
772 | ? 1 : 2); | |
773 | ||
774 | omapi_connection_copyout (&ddns -> codes [0], | |
775 | c, op_count); | |
9f3da356 | 776 | link -> imsg_count += op_count; |
d50d0b82 TL |
777 | if (op_count == 1) |
778 | ddns -> codes [1] = 0; | |
779 | op_size = 1; | |
d9eefc5d | 780 | op_count = option_len - op_count; |
d50d0b82 TL |
781 | |
782 | ddns -> length = op_count; | |
4bd8800e | 783 | ddns -> data = dmalloc (op_count, MDL); |
d50d0b82 TL |
784 | if (!ddns -> data) { |
785 | log_error ("FAILOVER: no memory getting%s(%d)", | |
786 | " DNS data ", op_count); | |
787 | ||
788 | /* Actually, NO_MEMORY, but if we lose here | |
789 | we have to drop the connection. */ | |
98bf1607 | 790 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 TL |
791 | } |
792 | omapi_connection_copyout (ddns -> data, c, op_count); | |
793 | goto out; | |
794 | } | |
d9eefc5d | 795 | |
d50d0b82 TL |
796 | /* A zero for num_present means that any number of |
797 | elements can appear, so we have to figure out how | |
798 | many we got from the length of the option, and then | |
799 | fill out a failover_option structure describing the | |
800 | data. */ | |
801 | op_size = ft_sizes [ft_options [option_code].type]; | |
802 | ||
803 | /* Make sure that option data length is a multiple of the | |
804 | size of the data type being sent. */ | |
d9eefc5d TL |
805 | if (op_size > 1 && option_len % op_size) { |
806 | log_error ("FAILOVER: option_len %d not %s%d", | |
807 | option_len, "multiple of ", op_size); | |
98bf1607 | 808 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 TL |
809 | } |
810 | ||
d9eefc5d | 811 | op_count = option_len / op_size; |
6ec59010 | 812 | |
d9eefc5d | 813 | fo = ((failover_option_t *) |
007e3ee4 | 814 | (((char *)link -> imsg) + |
d50d0b82 TL |
815 | ft_options [option_code].offset)); |
816 | ||
817 | fo -> count = op_count; | |
4bd8800e | 818 | fo -> data = dmalloc (option_len, MDL); |
d50d0b82 TL |
819 | if (!fo -> data) { |
820 | log_error ("FAILOVER: no memory getting %s (%d)", | |
821 | "option data", op_count); | |
822 | ||
98bf1607 | 823 | return DHCP_R_PROTOCOLERROR; |
6ec59010 | 824 | } |
d50d0b82 TL |
825 | op = fo -> data; |
826 | } | |
827 | ||
828 | /* For single-byte message values and multi-byte values that | |
829 | don't need swapping, just read them in all at once. */ | |
830 | if (op_size == 1 || ft_options [option_code].type == FT_IPADDR) { | |
831 | omapi_connection_copyout ((unsigned char *)op, c, option_len); | |
9f3da356 | 832 | link -> imsg_count += option_len; |
ffdf3c8c DH |
833 | |
834 | /* | |
835 | * As of 3.1.0, many option codes were changed to conform to | |
836 | * draft revision 12 (which alphabetized, then renumbered all | |
837 | * the option codes without preserving the version option code | |
838 | * nor bumping its value). As it turns out, the message codes | |
839 | * for CONNECT and CONNECTACK turn out the same, so it tries | |
840 | * its darndest to connect, and falls short (when TLS_REQUEST | |
841 | * comes up size 2 rather than size 1 as draft revision 12 also | |
842 | * mandates). | |
843 | * | |
844 | * The VENDOR_CLASS code in 3.0.x was 11, which is now the HBA | |
845 | * code. Both work out to be arbitrarily long text-or-byte | |
846 | * strings, so they pass parsing. | |
847 | * | |
848 | * Note that it is possible (or intentional), if highly | |
849 | * improbable, for the HBA bit array to exactly match | |
850 | * isc-V3.0.x. Warning here is not an issue; if it really is | |
851 | * 3.0.x, there will be a protocol error later on. If it isn't | |
852 | * actually 3.0.x, then I guess the lucky user will have to | |
853 | * live with a weird warning. | |
854 | */ | |
855 | if ((option_code == 11) && (option_len > 9) && | |
856 | (strncmp((const char *)op, "isc-V3.0.", 9) == 0)) { | |
857 | log_error("WARNING: failover as of versions 3.1.0 and " | |
858 | "on are not reverse compatible with " | |
859 | "versions 3.0.x."); | |
860 | } | |
861 | ||
d50d0b82 TL |
862 | goto out; |
863 | } | |
864 | ||
865 | /* For values that require swapping, read them in one at a time | |
866 | using routines that swap bytes. */ | |
867 | for (i = 0; i < op_count; i++) { | |
868 | switch (ft_options [option_code].type) { | |
869 | case FT_UINT32: | |
d9eefc5d | 870 | omapi_connection_get_uint32 (c, (u_int32_t *)op); |
d50d0b82 | 871 | op += 4; |
9f3da356 | 872 | link -> imsg_count += 4; |
d50d0b82 | 873 | break; |
6ec59010 | 874 | |
d50d0b82 | 875 | case FT_UINT16: |
d9eefc5d | 876 | omapi_connection_get_uint16 (c, (u_int16_t *)op); |
d50d0b82 | 877 | op += 2; |
9f3da356 | 878 | link -> imsg_count += 2; |
d50d0b82 | 879 | break; |
6ec59010 | 880 | |
d50d0b82 TL |
881 | default: |
882 | /* Everything else should have been handled | |
883 | already. */ | |
884 | log_error ("FAILOVER: option %s: bad type %d", | |
885 | ft_options [option_code].name, | |
886 | ft_options [option_code].type); | |
98bf1607 | 887 | return DHCP_R_PROTOCOLERROR; |
d50d0b82 TL |
888 | } |
889 | } | |
890 | out: | |
891 | /* Remember that we got this option. */ | |
d9eefc5d | 892 | link -> imsg -> options_present |= ft_options [option_code].bit; |
d50d0b82 TL |
893 | return ISC_R_SUCCESS; |
894 | } | |
895 | ||
896 | isc_result_t dhcp_failover_link_set_value (omapi_object_t *h, | |
897 | omapi_object_t *id, | |
898 | omapi_data_string_t *name, | |
899 | omapi_typed_data_t *value) | |
900 | { | |
901 | if (h -> type != omapi_type_protocol) | |
98bf1607 | 902 | return DHCP_R_INVALIDARG; |
d50d0b82 TL |
903 | |
904 | /* Never valid to set these. */ | |
d9eefc5d | 905 | if (!omapi_ds_strcmp (name, "link-port") || |
d50d0b82 TL |
906 | !omapi_ds_strcmp (name, "link-name") || |
907 | !omapi_ds_strcmp (name, "link-state")) | |
908 | return ISC_R_NOPERM; | |
909 | ||
910 | if (h -> inner && h -> inner -> type -> set_value) | |
911 | return (*(h -> inner -> type -> set_value)) | |
912 | (h -> inner, id, name, value); | |
913 | return ISC_R_NOTFOUND; | |
914 | } | |
915 | ||
916 | isc_result_t dhcp_failover_link_get_value (omapi_object_t *h, | |
917 | omapi_object_t *id, | |
918 | omapi_data_string_t *name, | |
919 | omapi_value_t **value) | |
920 | { | |
921 | dhcp_failover_link_t *link; | |
922 | ||
923 | if (h -> type != omapi_type_protocol) | |
98bf1607 | 924 | return DHCP_R_INVALIDARG; |
d50d0b82 | 925 | link = (dhcp_failover_link_t *)h; |
6ec59010 | 926 | |
d9eefc5d TL |
927 | if (!omapi_ds_strcmp (name, "link-port")) { |
928 | return omapi_make_int_value (value, name, | |
4bd8800e | 929 | (int)link -> peer_port, MDL); |
d50d0b82 | 930 | } else if (!omapi_ds_strcmp (name, "link-state")) { |
dc9d7b08 | 931 | if (link -> state >= dhcp_flink_state_max) |
4bd8800e TL |
932 | return omapi_make_string_value (value, name, |
933 | "invalid link state", | |
934 | MDL); | |
d50d0b82 TL |
935 | return omapi_make_string_value |
936 | (value, name, | |
4bd8800e | 937 | dhcp_flink_state_names [link -> state], MDL); |
d50d0b82 TL |
938 | } |
939 | ||
940 | if (h -> inner && h -> inner -> type -> get_value) | |
941 | return (*(h -> inner -> type -> get_value)) | |
942 | (h -> inner, id, name, value); | |
943 | return ISC_R_NOTFOUND; | |
944 | } | |
945 | ||
4bd8800e TL |
946 | isc_result_t dhcp_failover_link_destroy (omapi_object_t *h, |
947 | const char *file, int line) | |
d50d0b82 | 948 | { |
d9eefc5d | 949 | dhcp_failover_link_t *link; |
d50d0b82 | 950 | if (h -> type != dhcp_type_failover_link) |
98bf1607 | 951 | return DHCP_R_INVALIDARG; |
d9eefc5d | 952 | link = (dhcp_failover_link_t *)h; |
d758ad8c TL |
953 | |
954 | if (link -> peer_address) | |
955 | option_cache_dereference (&link -> peer_address, file, line); | |
956 | if (link -> imsg) | |
957 | failover_message_dereference (&link -> imsg, file, line); | |
85a53735 | 958 | if (link -> state_object) |
d758ad8c TL |
959 | dhcp_failover_state_dereference (&link -> state_object, |
960 | file, line); | |
d50d0b82 TL |
961 | return ISC_R_SUCCESS; |
962 | } | |
963 | ||
964 | /* Write all the published values associated with the object through the | |
965 | specified connection. */ | |
966 | ||
967 | isc_result_t dhcp_failover_link_stuff_values (omapi_object_t *c, | |
968 | omapi_object_t *id, | |
d9eefc5d | 969 | omapi_object_t *l) |
d50d0b82 TL |
970 | { |
971 | dhcp_failover_link_t *link; | |
d9eefc5d | 972 | isc_result_t status; |
d50d0b82 | 973 | |
d9eefc5d | 974 | if (l -> type != dhcp_type_failover_link) |
98bf1607 | 975 | return DHCP_R_INVALIDARG; |
d9eefc5d | 976 | link = (dhcp_failover_link_t *)l; |
6ec59010 | 977 | |
d9eefc5d | 978 | status = omapi_connection_put_name (c, "link-port"); |
d50d0b82 TL |
979 | if (status != ISC_R_SUCCESS) |
980 | return status; | |
d9eefc5d | 981 | status = omapi_connection_put_uint32 (c, sizeof (int)); |
d50d0b82 TL |
982 | if (status != ISC_R_SUCCESS) |
983 | return status; | |
d9eefc5d | 984 | status = omapi_connection_put_uint32 (c, link -> peer_port); |
d50d0b82 TL |
985 | if (status != ISC_R_SUCCESS) |
986 | return status; | |
6ec59010 | 987 | |
d50d0b82 TL |
988 | status = omapi_connection_put_name (c, "link-state"); |
989 | if (status != ISC_R_SUCCESS) | |
990 | return status; | |
dc9d7b08 | 991 | if (link -> state >= dhcp_flink_state_max) |
d50d0b82 TL |
992 | status = omapi_connection_put_string (c, "invalid link state"); |
993 | else | |
994 | status = (omapi_connection_put_string | |
d8a417b2 | 995 | (c, dhcp_flink_state_names [link -> state])); |
d50d0b82 TL |
996 | if (status != ISC_R_SUCCESS) |
997 | return status; | |
998 | ||
d9eefc5d TL |
999 | if (link -> inner && link -> inner -> type -> stuff_values) |
1000 | return (*(link -> inner -> type -> stuff_values)) (c, id, | |
1001 | link -> inner); | |
d50d0b82 TL |
1002 | return ISC_R_SUCCESS; |
1003 | } | |
1004 | ||
1005 | /* Set up a listener for the omapi protocol. The handle stored points to | |
1006 | a listener object, not a protocol object. */ | |
1007 | ||
d9eefc5d | 1008 | isc_result_t dhcp_failover_listen (omapi_object_t *h) |
d50d0b82 TL |
1009 | { |
1010 | isc_result_t status; | |
02ca1b45 | 1011 | dhcp_failover_listener_t *obj, *l; |
d50d0b82 | 1012 | omapi_value_t *value = (omapi_value_t *)0; |
85a53735 TL |
1013 | omapi_addr_t local_addr; |
1014 | unsigned long port; | |
d50d0b82 TL |
1015 | |
1016 | status = omapi_get_value_str (h, (omapi_object_t *)0, | |
1017 | "local-port", &value); | |
1018 | if (status != ISC_R_SUCCESS) | |
1019 | return status; | |
d9eefc5d | 1020 | if (!value -> value) { |
4bd8800e | 1021 | omapi_value_dereference (&value, MDL); |
98bf1607 | 1022 | return DHCP_R_INVALIDARG; |
d9eefc5d | 1023 | } |
6ec59010 | 1024 | |
d9eefc5d | 1025 | status = omapi_get_int_value (&port, value -> value); |
4bd8800e | 1026 | omapi_value_dereference (&value, MDL); |
d50d0b82 TL |
1027 | if (status != ISC_R_SUCCESS) |
1028 | return status; | |
85a53735 TL |
1029 | local_addr.port = port; |
1030 | ||
1031 | status = omapi_get_value_str (h, (omapi_object_t *)0, | |
1032 | "local-address", &value); | |
1033 | if (status != ISC_R_SUCCESS) | |
1034 | return status; | |
1035 | if (!value -> value) { | |
1036 | nogood: | |
1037 | omapi_value_dereference (&value, MDL); | |
98bf1607 | 1038 | return DHCP_R_INVALIDARG; |
85a53735 | 1039 | } |
6ec59010 | 1040 | |
85a53735 TL |
1041 | if (value -> value -> type != omapi_datatype_data || |
1042 | value -> value -> u.buffer.len != sizeof (struct in_addr)) | |
1043 | goto nogood; | |
1044 | ||
1045 | memcpy (local_addr.address, value -> value -> u.buffer.value, | |
1046 | value -> value -> u.buffer.len); | |
1047 | local_addr.addrlen = value -> value -> u.buffer.len; | |
1048 | local_addr.addrtype = AF_INET; | |
1049 | ||
1050 | omapi_value_dereference (&value, MDL); | |
d50d0b82 | 1051 | |
02ca1b45 TL |
1052 | /* Are we already listening on this port and address? */ |
1053 | for (l = failover_listeners; l; l = l -> next) { | |
1054 | if (l -> address.port == local_addr.port && | |
1055 | l -> address.addrtype == local_addr.addrtype && | |
1056 | l -> address.addrlen == local_addr.addrlen && | |
1057 | !memcmp (l -> address.address, local_addr.address, | |
1058 | local_addr.addrlen)) | |
1059 | break; | |
1060 | } | |
1061 | /* Already listening. */ | |
1062 | if (l) | |
1063 | return ISC_R_SUCCESS; | |
1064 | ||
20916cae TL |
1065 | obj = (dhcp_failover_listener_t *)0; |
1066 | status = dhcp_failover_listener_allocate (&obj, MDL); | |
1067 | if (status != ISC_R_SUCCESS) | |
1068 | return status; | |
02ca1b45 | 1069 | obj -> address = local_addr; |
6ec59010 | 1070 | |
02ca1b45 | 1071 | status = omapi_listen_addr ((omapi_object_t *)obj, &obj -> address, 1); |
d50d0b82 TL |
1072 | if (status != ISC_R_SUCCESS) |
1073 | return status; | |
1074 | ||
4bd8800e TL |
1075 | status = omapi_object_reference (&h -> outer, |
1076 | (omapi_object_t *)obj, MDL); | |
d50d0b82 | 1077 | if (status != ISC_R_SUCCESS) { |
20916cae | 1078 | dhcp_failover_listener_dereference (&obj, MDL); |
d50d0b82 TL |
1079 | return status; |
1080 | } | |
4bd8800e | 1081 | status = omapi_object_reference (&obj -> inner, h, MDL); |
d50d0b82 | 1082 | if (status != ISC_R_SUCCESS) { |
20916cae | 1083 | dhcp_failover_listener_dereference (&obj, MDL); |
d50d0b82 TL |
1084 | return status; |
1085 | } | |
1086 | ||
02ca1b45 | 1087 | /* Put this listener on the list. */ |
d2ff2ec2 TL |
1088 | if (failover_listeners) { |
1089 | dhcp_failover_listener_reference (&obj -> next, | |
1090 | failover_listeners, MDL); | |
1091 | dhcp_failover_listener_dereference (&failover_listeners, MDL); | |
1092 | } | |
02ca1b45 TL |
1093 | dhcp_failover_listener_reference (&failover_listeners, obj, MDL); |
1094 | ||
20916cae | 1095 | return dhcp_failover_listener_dereference (&obj, MDL); |
d50d0b82 TL |
1096 | } |
1097 | ||
1098 | /* Signal handler for protocol listener - if we get a connect signal, | |
1099 | create a new protocol connection, otherwise pass the signal down. */ | |
1100 | ||
1101 | isc_result_t dhcp_failover_listener_signal (omapi_object_t *o, | |
1102 | const char *name, va_list ap) | |
1103 | { | |
1104 | isc_result_t status; | |
1105 | omapi_connection_object_t *c; | |
d9eefc5d TL |
1106 | dhcp_failover_link_t *obj; |
1107 | dhcp_failover_listener_t *p; | |
85a53735 | 1108 | dhcp_failover_state_t *s, *state = (dhcp_failover_state_t *)0; |
d50d0b82 TL |
1109 | |
1110 | if (!o || o -> type != dhcp_type_failover_listener) | |
98bf1607 | 1111 | return DHCP_R_INVALIDARG; |
d9eefc5d | 1112 | p = (dhcp_failover_listener_t *)o; |
d50d0b82 TL |
1113 | |
1114 | /* Not a signal we recognize? */ | |
1115 | if (strcmp (name, "connect")) { | |
1116 | if (p -> inner && p -> inner -> type -> signal_handler) | |
1117 | return (*(p -> inner -> type -> signal_handler)) | |
1118 | (p -> inner, name, ap); | |
1119 | return ISC_R_NOTFOUND; | |
1120 | } | |
1121 | ||
1122 | c = va_arg (ap, omapi_connection_object_t *); | |
1123 | if (!c || c -> type != omapi_type_connection) | |
98bf1607 | 1124 | return DHCP_R_INVALIDARG; |
d50d0b82 | 1125 | |
02ca1b45 TL |
1126 | /* See if we can find a failover_state object that |
1127 | matches this connection. */ | |
1128 | for (s = failover_states; s; s = s -> next) { | |
1129 | if (dhcp_failover_state_match | |
1130 | (s, (u_int8_t *)&c -> remote_addr.sin_addr, | |
d758ad8c | 1131 | sizeof c -> remote_addr.sin_addr)) { |
02ca1b45 | 1132 | state = s; |
d758ad8c TL |
1133 | break; |
1134 | } | |
6ec59010 | 1135 | } |
02ca1b45 TL |
1136 | if (!state) { |
1137 | log_info ("failover: listener: no matching state"); | |
9d97e644 SR |
1138 | omapi_disconnect ((omapi_object_t *)c, 1); |
1139 | return(ISC_R_NOTFOUND); | |
02ca1b45 TL |
1140 | } |
1141 | ||
20916cae TL |
1142 | obj = (dhcp_failover_link_t *)0; |
1143 | status = dhcp_failover_link_allocate (&obj, MDL); | |
1144 | if (status != ISC_R_SUCCESS) | |
1145 | return status; | |
d9eefc5d | 1146 | obj -> peer_port = ntohs (c -> remote_addr.sin_port); |
d50d0b82 | 1147 | |
4bd8800e TL |
1148 | status = omapi_object_reference (&obj -> outer, |
1149 | (omapi_object_t *)c, MDL); | |
d50d0b82 TL |
1150 | if (status != ISC_R_SUCCESS) { |
1151 | lose: | |
20916cae | 1152 | dhcp_failover_link_dereference (&obj, MDL); |
02ca1b45 | 1153 | log_info ("failover: listener: picayune failure."); |
d9eefc5d | 1154 | omapi_disconnect ((omapi_object_t *)c, 1); |
d50d0b82 TL |
1155 | return status; |
1156 | } | |
1157 | ||
4bd8800e TL |
1158 | status = omapi_object_reference (&c -> inner, |
1159 | (omapi_object_t *)obj, MDL); | |
d50d0b82 TL |
1160 | if (status != ISC_R_SUCCESS) |
1161 | goto lose; | |
1162 | ||
02ca1b45 TL |
1163 | status = dhcp_failover_state_reference (&obj -> state_object, |
1164 | state, MDL); | |
1165 | if (status != ISC_R_SUCCESS) | |
1166 | goto lose; | |
1167 | ||
1168 | omapi_signal_in ((omapi_object_t *)obj, "connect"); | |
1169 | ||
20916cae | 1170 | return dhcp_failover_link_dereference (&obj, MDL); |
d50d0b82 TL |
1171 | } |
1172 | ||
1173 | isc_result_t dhcp_failover_listener_set_value (omapi_object_t *h, | |
1174 | omapi_object_t *id, | |
1175 | omapi_data_string_t *name, | |
1176 | omapi_typed_data_t *value) | |
1177 | { | |
1178 | if (h -> type != dhcp_type_failover_listener) | |
98bf1607 | 1179 | return DHCP_R_INVALIDARG; |
6ec59010 | 1180 | |
d50d0b82 TL |
1181 | if (h -> inner && h -> inner -> type -> set_value) |
1182 | return (*(h -> inner -> type -> set_value)) | |
1183 | (h -> inner, id, name, value); | |
1184 | return ISC_R_NOTFOUND; | |
1185 | } | |
1186 | ||
1187 | isc_result_t dhcp_failover_listener_get_value (omapi_object_t *h, | |
1188 | omapi_object_t *id, | |
1189 | omapi_data_string_t *name, | |
1190 | omapi_value_t **value) | |
1191 | { | |
1192 | if (h -> type != dhcp_type_failover_listener) | |
98bf1607 | 1193 | return DHCP_R_INVALIDARG; |
6ec59010 | 1194 | |
d50d0b82 TL |
1195 | if (h -> inner && h -> inner -> type -> get_value) |
1196 | return (*(h -> inner -> type -> get_value)) | |
1197 | (h -> inner, id, name, value); | |
1198 | return ISC_R_NOTFOUND; | |
1199 | } | |
1200 | ||
1201 | isc_result_t dhcp_failover_listener_destroy (omapi_object_t *h, | |
4bd8800e | 1202 | const char *file, int line) |
d50d0b82 | 1203 | { |
d758ad8c TL |
1204 | dhcp_failover_listener_t *l; |
1205 | ||
d50d0b82 | 1206 | if (h -> type != dhcp_type_failover_listener) |
98bf1607 | 1207 | return DHCP_R_INVALIDARG; |
d758ad8c TL |
1208 | l = (dhcp_failover_listener_t *)h; |
1209 | if (l -> next) | |
1210 | dhcp_failover_listener_dereference (&l -> next, file, line); | |
1211 | ||
d50d0b82 TL |
1212 | return ISC_R_SUCCESS; |
1213 | } | |
1214 | ||
1215 | /* Write all the published values associated with the object through the | |
1216 | specified connection. */ | |
1217 | ||
1218 | isc_result_t dhcp_failover_listener_stuff (omapi_object_t *c, | |
1219 | omapi_object_t *id, | |
1220 | omapi_object_t *p) | |
1221 | { | |
d50d0b82 | 1222 | if (p -> type != dhcp_type_failover_listener) |
98bf1607 | 1223 | return DHCP_R_INVALIDARG; |
d50d0b82 TL |
1224 | |
1225 | if (p -> inner && p -> inner -> type -> stuff_values) | |
1226 | return (*(p -> inner -> type -> stuff_values)) (c, id, | |
1227 | p -> inner); | |
1228 | return ISC_R_SUCCESS; | |
1229 | } | |
1230 | ||
1231 | /* Set up master state machine for the failover protocol. */ | |
1232 | ||
d9eefc5d | 1233 | isc_result_t dhcp_failover_register (omapi_object_t *h) |
d50d0b82 TL |
1234 | { |
1235 | isc_result_t status; | |
d9eefc5d | 1236 | dhcp_failover_state_t *obj; |
d50d0b82 TL |
1237 | unsigned long port; |
1238 | omapi_value_t *value = (omapi_value_t *)0; | |
1239 | ||
1240 | status = omapi_get_value_str (h, (omapi_object_t *)0, | |
1241 | "local-port", &value); | |
1242 | if (status != ISC_R_SUCCESS) | |
1243 | return status; | |
d9eefc5d | 1244 | if (!value -> value) { |
4bd8800e | 1245 | omapi_value_dereference (&value, MDL); |
98bf1607 | 1246 | return DHCP_R_INVALIDARG; |
d9eefc5d | 1247 | } |
6ec59010 | 1248 | |
d9eefc5d | 1249 | status = omapi_get_int_value (&port, value -> value); |
4bd8800e | 1250 | omapi_value_dereference (&value, MDL); |
d50d0b82 TL |
1251 | if (status != ISC_R_SUCCESS) |
1252 | return status; | |
1253 | ||
20916cae TL |
1254 | obj = (dhcp_failover_state_t *)0; |
1255 | dhcp_failover_state_allocate (&obj, MDL); | |
02ca1b45 | 1256 | obj -> me.port = port; |
6ec59010 | 1257 | |
d50d0b82 | 1258 | status = omapi_listen ((omapi_object_t *)obj, port, 1); |
20916cae TL |
1259 | if (status != ISC_R_SUCCESS) { |
1260 | dhcp_failover_state_dereference (&obj, MDL); | |
d50d0b82 | 1261 | return status; |
20916cae | 1262 | } |
d50d0b82 TL |
1263 | |
1264 | status = omapi_object_reference (&h -> outer, (omapi_object_t *)obj, | |
4bd8800e | 1265 | MDL); |
d50d0b82 | 1266 | if (status != ISC_R_SUCCESS) { |
20916cae | 1267 | dhcp_failover_state_dereference (&obj, MDL); |
d50d0b82 TL |
1268 | return status; |
1269 | } | |
4bd8800e | 1270 | status = omapi_object_reference (&obj -> inner, h, MDL); |
20916cae | 1271 | dhcp_failover_state_dereference (&obj, MDL); |
d50d0b82 TL |
1272 | return status; |
1273 | } | |
1274 | ||
1275 | /* Signal handler for protocol state machine. */ | |
1276 | ||
1277 | isc_result_t dhcp_failover_state_signal (omapi_object_t *o, | |
1278 | const char *name, va_list ap) | |
1279 | { | |
1280 | isc_result_t status; | |
d9eefc5d | 1281 | dhcp_failover_state_t *state; |
9f3da356 | 1282 | dhcp_failover_link_t *link; |
be62cf06 | 1283 | struct timeval tv; |
d50d0b82 TL |
1284 | |
1285 | if (!o || o -> type != dhcp_type_failover_state) | |
98bf1607 | 1286 | return DHCP_R_INVALIDARG; |
d9eefc5d | 1287 | state = (dhcp_failover_state_t *)o; |
d50d0b82 TL |
1288 | |
1289 | /* Not a signal we recognize? */ | |
9f3da356 | 1290 | if (strcmp (name, "disconnect") && |
d50d0b82 | 1291 | strcmp (name, "message")) { |
d9eefc5d TL |
1292 | if (state -> inner && state -> inner -> type -> signal_handler) |
1293 | return (*(state -> inner -> type -> signal_handler)) | |
1294 | (state -> inner, name, ap); | |
d50d0b82 TL |
1295 | return ISC_R_NOTFOUND; |
1296 | } | |
1297 | ||
85a53735 TL |
1298 | /* Handle connect signals by seeing what state we're in |
1299 | and potentially doing a state transition. */ | |
9f3da356 TL |
1300 | if (!strcmp (name, "disconnect")) { |
1301 | link = va_arg (ap, dhcp_failover_link_t *); | |
1302 | ||
20916cae | 1303 | dhcp_failover_link_dereference (&state -> link_to_peer, MDL); |
9f3da356 | 1304 | dhcp_failover_state_transition (state, "disconnect"); |
0db87765 TL |
1305 | if (state -> i_am == primary) { |
1306 | #if defined (DEBUG_FAILOVER_TIMING) | |
1307 | log_info ("add_timeout +90 %s", | |
1308 | "dhcp_failover_reconnect"); | |
1309 | #endif | |
be62cf06 FD |
1310 | tv . tv_sec = cur_time + 90; |
1311 | tv . tv_usec = 0; | |
1312 | add_timeout (&tv, dhcp_failover_reconnect, | |
20916cae TL |
1313 | state, |
1314 | (tvref_t)dhcp_failover_state_reference, | |
1315 | (tvunref_t) | |
1316 | dhcp_failover_state_dereference); | |
0db87765 | 1317 | } |
9f3da356 TL |
1318 | } else if (!strcmp (name, "message")) { |
1319 | link = va_arg (ap, dhcp_failover_link_t *); | |
1320 | ||
1321 | if (link -> imsg -> type == FTM_CONNECT) { | |
1322 | /* If we already have a link to the peer, it must be | |
1323 | dead, so drop it. | |
02ca1b45 TL |
1324 | XXX Is this the right thing to do? |
1325 | XXX Probably not - what if both peers start at | |
1326 | XXX the same time? */ | |
9f3da356 | 1327 | if (state -> link_to_peer) { |
02ca1b45 TL |
1328 | dhcp_failover_send_connectack |
1329 | ((omapi_object_t *)link, state, | |
1330 | FTR_DUP_CONNECTION, | |
1331 | "already connected"); | |
1332 | omapi_disconnect (link -> outer, 1); | |
1333 | return ISC_R_SUCCESS; | |
9f3da356 | 1334 | } |
02ca1b45 TL |
1335 | if (!(link -> imsg -> options_present & FTB_MCLT)) { |
1336 | dhcp_failover_send_connectack | |
1337 | ((omapi_object_t *)link, state, | |
1338 | FTR_INVALID_MCLT, | |
1339 | "no MCLT provided"); | |
1340 | omapi_disconnect (link -> outer, 1); | |
1341 | return ISC_R_SUCCESS; | |
6ec59010 | 1342 | } |
02ca1b45 | 1343 | |
20916cae TL |
1344 | dhcp_failover_link_reference (&state -> link_to_peer, |
1345 | link, MDL); | |
9f3da356 | 1346 | status = (dhcp_failover_send_connectack |
007e3ee4 | 1347 | ((omapi_object_t *)link, state, 0, 0)); |
9f3da356 | 1348 | if (status != ISC_R_SUCCESS) { |
20916cae | 1349 | dhcp_failover_link_dereference |
9f3da356 | 1350 | (&state -> link_to_peer, MDL); |
02ca1b45 TL |
1351 | log_info ("dhcp_failover_send_connectack: %s", |
1352 | isc_result_totext (status)); | |
9f3da356 TL |
1353 | omapi_disconnect (link -> outer, 1); |
1354 | return ISC_R_SUCCESS; | |
1355 | } | |
02ca1b45 TL |
1356 | if (link -> imsg -> options_present & FTB_MAX_UNACKED) |
1357 | state -> partner.max_flying_updates = | |
1358 | link -> imsg -> max_unacked; | |
a55ccdd0 | 1359 | if (link -> imsg -> options_present & FTB_RECEIVE_TIMER) |
02ca1b45 TL |
1360 | state -> partner.max_response_delay = |
1361 | link -> imsg -> receive_timer; | |
1362 | state -> mclt = link -> imsg -> mclt; | |
1363 | dhcp_failover_send_state (state); | |
1364 | cancel_timeout (dhcp_failover_link_startup_timeout, | |
1365 | link); | |
9f3da356 | 1366 | } else if (link -> imsg -> type == FTM_CONNECTACK) { |
007e3ee4 | 1367 | const char *errmsg; |
fa9b593d | 1368 | char errbuf[1024]; |
007e3ee4 | 1369 | int reason; |
da292833 TL |
1370 | |
1371 | cancel_timeout (dhcp_failover_link_startup_timeout, | |
1372 | link); | |
1373 | ||
a55ccdd0 DH |
1374 | if (!(link->imsg->options_present & |
1375 | FTB_RELATIONSHIP_NAME)) { | |
1376 | errmsg = "missing relationship-name"; | |
1377 | reason = FTR_INVALID_PARTNER; | |
1378 | goto badconnectack; | |
1379 | } | |
1380 | ||
1381 | if (link->imsg->options_present & FTB_REJECT_REASON) { | |
1382 | /* XXX: add message option to text output. */ | |
1383 | log_error ("Failover CONNECT to %s rejected: %s", | |
1384 | state ? state->name : "unknown", | |
9f3da356 TL |
1385 | (dhcp_failover_reject_reason_print |
1386 | (link -> imsg -> reject_reason))); | |
007e3ee4 | 1387 | /* XXX print message from peer if peer sent message. */ |
9f3da356 TL |
1388 | omapi_disconnect (link -> outer, 1); |
1389 | return ISC_R_SUCCESS; | |
1390 | } | |
fa9b593d | 1391 | |
a55ccdd0 DH |
1392 | if (!dhcp_failover_state_match_by_name(state, |
1393 | &link->imsg->relationship_name)) { | |
fa9b593d DH |
1394 | /* XXX: Overflow results in log truncation, safe. */ |
1395 | snprintf(errbuf, sizeof(errbuf), "remote failover " | |
1396 | "relationship name %.*s does not match", | |
d7ec175b | 1397 | (int)link->imsg->relationship_name.count, |
fa9b593d DH |
1398 | link->imsg->relationship_name.data); |
1399 | errmsg = errbuf; | |
007e3ee4 TL |
1400 | reason = FTR_INVALID_PARTNER; |
1401 | badconnectack: | |
fa9b593d DH |
1402 | log_error("Failover CONNECTACK from %s: %s", |
1403 | state->name, errmsg); | |
9f3da356 | 1404 | dhcp_failover_send_disconnect ((omapi_object_t *)link, |
007e3ee4 | 1405 | reason, errmsg); |
9f3da356 | 1406 | omapi_disconnect (link -> outer, 0); |
6f0b9ed0 | 1407 | return ISC_R_SUCCESS; |
9f3da356 | 1408 | } |
25a69ca1 TL |
1409 | |
1410 | if (state -> link_to_peer) { | |
007e3ee4 TL |
1411 | errmsg = "already connected"; |
1412 | reason = FTR_DUP_CONNECTION; | |
1413 | goto badconnectack; | |
25a69ca1 | 1414 | } |
007e3ee4 | 1415 | |
d758ad8c TL |
1416 | if ((cur_time > link -> imsg -> time && |
1417 | cur_time - link -> imsg -> time > 60) || | |
1418 | (cur_time < link -> imsg -> time && | |
1419 | link -> imsg -> time - cur_time > 60)) { | |
1420 | errmsg = "time offset too large"; | |
1421 | reason = FTR_TIMEMISMATCH; | |
1422 | goto badconnectack; | |
1423 | } | |
1424 | ||
20916cae TL |
1425 | dhcp_failover_link_reference (&state -> link_to_peer, |
1426 | link, MDL); | |
02ca1b45 | 1427 | #if 0 |
fd273e02 TL |
1428 | /* XXX This is probably the right thing to do, but |
1429 | XXX for release three, to make the smallest possible | |
1430 | XXX change, we are doing this when the peer state | |
1431 | XXX changes instead. */ | |
1432 | if (state -> me.state == startup) | |
1433 | dhcp_failover_set_state (state, | |
1434 | state -> saved_state); | |
1435 | else | |
02ca1b45 | 1436 | #endif |
fd273e02 TL |
1437 | dhcp_failover_send_state (state); |
1438 | ||
02ca1b45 TL |
1439 | if (link -> imsg -> options_present & FTB_MAX_UNACKED) |
1440 | state -> partner.max_flying_updates = | |
1441 | link -> imsg -> max_unacked; | |
1442 | if (link -> imsg -> options_present & FTB_RECEIVE_TIMER) | |
1443 | state -> partner.max_response_delay = | |
1444 | link -> imsg -> receive_timer; | |
1387545f | 1445 | #if defined (DEBUG_FAILOVER_CONTACT_TIMING) |
0db87765 TL |
1446 | log_info ("add_timeout +%d %s", |
1447 | (int)state -> partner.max_response_delay / 3, | |
1448 | "dhcp_failover_send_contact"); | |
1449 | #endif | |
be62cf06 FD |
1450 | tv . tv_sec = cur_time + |
1451 | (int)state -> partner.max_response_delay / 3; | |
1452 | tv . tv_usec = 0; | |
1453 | add_timeout (&tv, | |
6f0b9ed0 TL |
1454 | dhcp_failover_send_contact, state, |
1455 | (tvref_t)dhcp_failover_state_reference, | |
1456 | (tvunref_t)dhcp_failover_state_dereference); | |
1387545f | 1457 | #if defined (DEBUG_FAILOVER_CONTACT_TIMING) |
0db87765 TL |
1458 | log_info ("add_timeout +%d %s", |
1459 | (int)state -> me.max_response_delay, | |
1460 | "dhcp_failover_timeout"); | |
1461 | #endif | |
be62cf06 FD |
1462 | tv . tv_sec = cur_time + |
1463 | (int)state -> me.max_response_delay; | |
1464 | tv . tv_usec = 0; | |
1465 | add_timeout (&tv, | |
6f0b9ed0 TL |
1466 | dhcp_failover_timeout, state, |
1467 | (tvref_t)dhcp_failover_state_reference, | |
1468 | (tvunref_t)dhcp_failover_state_dereference); | |
9f3da356 TL |
1469 | } else if (link -> imsg -> type == FTM_DISCONNECT) { |
1470 | if (link -> imsg -> reject_reason) { | |
a55ccdd0 DH |
1471 | log_error ("Failover DISCONNECT from %s: %s", |
1472 | state ? state->name : "unknown", | |
9f3da356 TL |
1473 | (dhcp_failover_reject_reason_print |
1474 | (link -> imsg -> reject_reason))); | |
1475 | } | |
1476 | omapi_disconnect (link -> outer, 1); | |
9f3da356 | 1477 | } else if (link -> imsg -> type == FTM_BNDUPD) { |
8c8e27c5 TL |
1478 | dhcp_failover_process_bind_update (state, |
1479 | link -> imsg); | |
9f3da356 | 1480 | } else if (link -> imsg -> type == FTM_BNDACK) { |
8c8e27c5 | 1481 | dhcp_failover_process_bind_ack (state, link -> imsg); |
5f0c7be1 TL |
1482 | } else if (link -> imsg -> type == FTM_UPDREQ) { |
1483 | dhcp_failover_process_update_request (state, | |
1484 | link -> imsg); | |
1485 | } else if (link -> imsg -> type == FTM_UPDREQALL) { | |
1486 | dhcp_failover_process_update_request_all | |
1487 | (state, link -> imsg); | |
1488 | } else if (link -> imsg -> type == FTM_UPDDONE) { | |
1489 | dhcp_failover_process_update_done (state, | |
1490 | link -> imsg); | |
8c8e27c5 | 1491 | } else if (link -> imsg -> type == FTM_POOLREQ) { |
2426234f | 1492 | dhcp_failover_pool_reqbalance(state); |
8c8e27c5 | 1493 | } else if (link -> imsg -> type == FTM_POOLRESP) { |
165bce70 TL |
1494 | log_info ("pool response: %ld leases", |
1495 | (unsigned long) | |
8c8e27c5 | 1496 | link -> imsg -> addresses_transferred); |
02ca1b45 | 1497 | } else if (link -> imsg -> type == FTM_STATE) { |
5f0c7be1 TL |
1498 | dhcp_failover_peer_state_changed (state, |
1499 | link -> imsg); | |
02ca1b45 | 1500 | } |
85a53735 | 1501 | |
da292833 TL |
1502 | /* Add a timeout so that if the partner doesn't send |
1503 | another message for the maximum transmit idle time | |
1504 | plus a grace of one second, we close the | |
1505 | connection. */ | |
1506 | if (state -> link_to_peer && | |
1507 | state -> link_to_peer == link && | |
1508 | state -> link_to_peer -> state != dhcp_flink_disconnected) | |
0db87765 | 1509 | { |
1387545f | 1510 | #if defined (DEBUG_FAILOVER_CONTACT_TIMING) |
0db87765 TL |
1511 | log_info ("add_timeout +%d %s", |
1512 | (int)state -> me.max_response_delay, | |
1513 | "dhcp_failover_timeout"); | |
1514 | #endif | |
be62cf06 FD |
1515 | tv . tv_sec = cur_time + |
1516 | (int)state -> me.max_response_delay; | |
1517 | tv . tv_usec = 0; | |
1518 | add_timeout (&tv, | |
da292833 TL |
1519 | dhcp_failover_timeout, state, |
1520 | (tvref_t)dhcp_failover_state_reference, | |
1521 | (tvunref_t)dhcp_failover_state_dereference); | |
1522 | ||
0db87765 | 1523 | } |
da292833 | 1524 | } |
6f0b9ed0 | 1525 | |
d9eefc5d TL |
1526 | /* Handle all the events we care about... */ |
1527 | return ISC_R_SUCCESS; | |
d50d0b82 TL |
1528 | } |
1529 | ||
85a53735 TL |
1530 | isc_result_t dhcp_failover_state_transition (dhcp_failover_state_t *state, |
1531 | const char *name) | |
1532 | { | |
d758ad8c TL |
1533 | isc_result_t status; |
1534 | ||
85a53735 TL |
1535 | /* XXX Check these state transitions against the spec! */ |
1536 | if (!strcmp (name, "disconnect")) { | |
e651f9b2 | 1537 | if (state -> link_to_peer) { |
02ca1b45 | 1538 | log_info ("peer %s: disconnected", state -> name); |
e651f9b2 TL |
1539 | if (state -> link_to_peer -> state_object) |
1540 | dhcp_failover_state_dereference | |
1541 | (&state -> link_to_peer -> state_object, MDL); | |
1542 | dhcp_failover_link_dereference (&state -> link_to_peer, | |
1543 | MDL); | |
1544 | } | |
1545 | cancel_timeout (dhcp_failover_send_contact, state); | |
1546 | cancel_timeout (dhcp_failover_timeout, state); | |
02ca1b45 | 1547 | cancel_timeout (dhcp_failover_startup_timeout, state); |
e651f9b2 | 1548 | |
02ca1b45 TL |
1549 | switch (state -> me.state == startup ? |
1550 | state -> saved_state : state -> me.state) { | |
a55ccdd0 DH |
1551 | /* In these situations, we remain in the current |
1552 | * state, or if in startup enter those states. | |
1553 | */ | |
a55ccdd0 | 1554 | case conflict_done: |
21d30347 SR |
1555 | /* As the peer may not have received or may have |
1556 | * lost track of updates we sent previously we | |
1557 | * rescind them, causing us to retransmit them | |
1558 | * on an update request. | |
1559 | */ | |
1560 | dhcp_failover_rescind_updates(state); | |
1561 | /* fall through */ | |
1562 | ||
1563 | case communications_interrupted: | |
a55ccdd0 DH |
1564 | case partner_down: |
1565 | case paused: | |
31bbee78 | 1566 | case recover: |
a55ccdd0 DH |
1567 | case recover_done: |
1568 | case recover_wait: | |
1569 | case resolution_interrupted: | |
1570 | case shut_down: | |
85a53735 | 1571 | /* Already in the right state? */ |
02ca1b45 TL |
1572 | if (state -> me.state == startup) |
1573 | return (dhcp_failover_set_state | |
1574 | (state, state -> saved_state)); | |
85a53735 | 1575 | return ISC_R_SUCCESS; |
6ec59010 | 1576 | |
85a53735 TL |
1577 | case potential_conflict: |
1578 | return dhcp_failover_set_state | |
5f0c7be1 | 1579 | (state, resolution_interrupted); |
6ec59010 | 1580 | |
85a53735 TL |
1581 | case normal: |
1582 | return dhcp_failover_set_state | |
1583 | (state, communications_interrupted); | |
1584 | ||
9f3da356 | 1585 | case unknown_state: |
85a53735 | 1586 | return dhcp_failover_set_state |
5f0c7be1 | 1587 | (state, resolution_interrupted); |
a55ccdd0 DH |
1588 | |
1589 | default: | |
1590 | log_fatal("Impossible case at %s:%d.", MDL); | |
02ca1b45 | 1591 | break; /* can't happen. */ |
85a53735 TL |
1592 | } |
1593 | } else if (!strcmp (name, "connect")) { | |
02ca1b45 | 1594 | switch (state -> me.state) { |
85a53735 | 1595 | case communications_interrupted: |
d758ad8c TL |
1596 | status = dhcp_failover_set_state (state, normal); |
1597 | dhcp_failover_send_updates (state); | |
1598 | return status; | |
9f3da356 | 1599 | |
5f0c7be1 | 1600 | case resolution_interrupted: |
9f3da356 TL |
1601 | return dhcp_failover_set_state (state, |
1602 | potential_conflict); | |
1603 | ||
a55ccdd0 | 1604 | case conflict_done: |
02ca1b45 | 1605 | case partner_down: |
85a53735 | 1606 | case potential_conflict: |
9f3da356 | 1607 | case normal: |
02ca1b45 TL |
1608 | case recover: |
1609 | case shut_down: | |
1610 | case paused: | |
9f3da356 | 1611 | case unknown_state: |
d9539882 TL |
1612 | case recover_done: |
1613 | case startup: | |
fd273e02 | 1614 | case recover_wait: |
02ca1b45 | 1615 | return dhcp_failover_send_state (state); |
a55ccdd0 DH |
1616 | |
1617 | default: | |
1618 | log_fatal("Impossible case at %s:%d.", MDL); | |
1619 | break; | |
9f3da356 TL |
1620 | } |
1621 | } else if (!strcmp (name, "startup")) { | |
02ca1b45 TL |
1622 | dhcp_failover_set_state (state, startup); |
1623 | return ISC_R_SUCCESS; | |
5f0c7be1 | 1624 | } else if (!strcmp (name, "connect-timeout")) { |
02ca1b45 | 1625 | switch (state -> me.state) { |
9f3da356 TL |
1626 | case communications_interrupted: |
1627 | case partner_down: | |
5f0c7be1 | 1628 | case resolution_interrupted: |
a55ccdd0 DH |
1629 | case paused: |
1630 | case startup: | |
1631 | case shut_down: | |
1632 | case conflict_done: | |
9f3da356 TL |
1633 | return ISC_R_SUCCESS; |
1634 | ||
85a53735 | 1635 | case normal: |
9f3da356 | 1636 | case recover: |
a55ccdd0 DH |
1637 | case recover_wait: |
1638 | case recover_done: | |
1639 | case unknown_state: | |
9f3da356 TL |
1640 | return dhcp_failover_set_state |
1641 | (state, communications_interrupted); | |
1642 | ||
1643 | case potential_conflict: | |
1644 | return dhcp_failover_set_state | |
5f0c7be1 | 1645 | (state, resolution_interrupted); |
9f3da356 | 1646 | |
9f3da356 | 1647 | default: |
a55ccdd0 DH |
1648 | log_fatal("Impossible case at %s:%d.", MDL); |
1649 | break; | |
85a53735 | 1650 | } |
85a53735 | 1651 | } |
98bf1607 | 1652 | return DHCP_R_INVALIDARG; |
85a53735 TL |
1653 | } |
1654 | ||
5f0c7be1 TL |
1655 | isc_result_t dhcp_failover_set_service_state (dhcp_failover_state_t *state) |
1656 | { | |
02ca1b45 | 1657 | switch (state -> me.state) { |
5f0c7be1 TL |
1658 | case unknown_state: |
1659 | state -> service_state = not_responding; | |
1660 | state -> nrr = " (my state unknown)"; | |
1661 | break; | |
1662 | ||
1663 | case partner_down: | |
1664 | state -> service_state = service_partner_down; | |
1665 | state -> nrr = ""; | |
1666 | break; | |
1667 | ||
1668 | case normal: | |
1669 | state -> service_state = cooperating; | |
1670 | state -> nrr = ""; | |
1671 | break; | |
1672 | ||
1673 | case communications_interrupted: | |
1674 | state -> service_state = not_cooperating; | |
1675 | state -> nrr = ""; | |
1676 | break; | |
1677 | ||
1678 | case resolution_interrupted: | |
1679 | case potential_conflict: | |
a55ccdd0 | 1680 | case conflict_done: |
5f0c7be1 TL |
1681 | state -> service_state = not_responding; |
1682 | state -> nrr = " (resolving conflicts)"; | |
1683 | break; | |
1684 | ||
1685 | case recover: | |
1686 | state -> service_state = not_responding; | |
1687 | state -> nrr = " (recovering)"; | |
1688 | break; | |
1689 | ||
1690 | case shut_down: | |
1691 | state -> service_state = not_responding; | |
1692 | state -> nrr = " (shut down)"; | |
1693 | break; | |
1694 | ||
1695 | case paused: | |
1696 | state -> service_state = not_responding; | |
1697 | state -> nrr = " (paused)"; | |
1698 | break; | |
1699 | ||
fd273e02 TL |
1700 | case recover_wait: |
1701 | state -> service_state = not_responding; | |
1702 | state -> nrr = " (recover wait)"; | |
1703 | break; | |
1704 | ||
5f0c7be1 TL |
1705 | case recover_done: |
1706 | state -> service_state = not_responding; | |
1707 | state -> nrr = " (recover done)"; | |
1708 | break; | |
02ca1b45 TL |
1709 | |
1710 | case startup: | |
1711 | state -> service_state = service_startup; | |
1712 | state -> nrr = " (startup)"; | |
1713 | break; | |
a55ccdd0 DH |
1714 | |
1715 | default: | |
1716 | log_fatal("Impossible case at %s:%d.\n", MDL); | |
1717 | break; | |
5f0c7be1 TL |
1718 | } |
1719 | ||
1720 | /* Some peer states can require us not to respond, even if our | |
1721 | state doesn't. */ | |
1722 | /* XXX hm. I suspect this isn't true anymore. */ | |
1723 | if (state -> service_state != not_responding) { | |
02ca1b45 | 1724 | switch (state -> partner.state) { |
5f0c7be1 | 1725 | case partner_down: |
5f0c7be1 | 1726 | state -> service_state = not_responding; |
a55ccdd0 | 1727 | state -> nrr = " (peer demands: recovering)"; |
5f0c7be1 TL |
1728 | break; |
1729 | ||
1730 | case potential_conflict: | |
a55ccdd0 DH |
1731 | case conflict_done: |
1732 | case resolution_interrupted: | |
5f0c7be1 | 1733 | state -> service_state = not_responding; |
a55ccdd0 | 1734 | state -> nrr = " (peer demands: resolving conflicts)"; |
5f0c7be1 TL |
1735 | break; |
1736 | ||
1737 | /* Other peer states don't affect our behaviour. */ | |
1738 | default: | |
1739 | break; | |
1740 | } | |
1741 | } | |
1742 | ||
1743 | return ISC_R_SUCCESS; | |
1744 | } | |
1745 | ||
21d30347 SR |
1746 | /*! |
1747 | * \brief Return any leases on the ack queue back to the update queue | |
1748 | * | |
1749 | * Re-schedule any pending updates by moving them from the ack queue | |
1750 | * (update sent awaiting response) back to the update queue (need to | |
1751 | * send an update for this lease). This will result in a retransmission | |
1752 | * of the update. | |
1753 | * | |
1754 | * \param state is the state block for the failover connection we are | |
1755 | * updating. | |
1756 | */ | |
1757 | ||
1758 | void dhcp_failover_rescind_updates (dhcp_failover_state_t *state) | |
1759 | { | |
1760 | struct lease *lp; | |
1761 | ||
1762 | if (state->ack_queue_tail == NULL) | |
1763 | return; | |
1764 | ||
1765 | /* Zap the flags. */ | |
1766 | for (lp = state->ack_queue_head; lp; lp = lp->next_pending) | |
1767 | lp->flags = ((lp->flags & ~ON_ACK_QUEUE) | ON_UPDATE_QUEUE); | |
1768 | ||
1769 | /* Now hook the ack queue to the beginning of the update queue. */ | |
1770 | if (state->update_queue_head) { | |
1771 | lease_reference(&state->ack_queue_tail->next_pending, | |
1772 | state->update_queue_head, MDL); | |
1773 | lease_dereference(&state->update_queue_head, MDL); | |
1774 | } | |
1775 | lease_reference(&state->update_queue_head, state->ack_queue_head, MDL); | |
1776 | ||
1777 | if (!state->update_queue_tail) { | |
1778 | #if defined (POINTER_DEBUG) | |
1779 | if (state->ack_queue_tail->next_pending) { | |
1780 | log_error("next pending on ack queue tail."); | |
1781 | abort(); | |
1782 | } | |
1783 | #endif | |
1784 | lease_reference(&state->update_queue_tail, | |
1785 | state->ack_queue_tail, MDL); | |
1786 | } | |
1787 | lease_dereference(&state->ack_queue_tail, MDL); | |
1788 | lease_dereference(&state->ack_queue_head, MDL); | |
1789 | state->cur_unacked_updates = 0; | |
1790 | } | |
1791 | ||
85a53735 TL |
1792 | isc_result_t dhcp_failover_set_state (dhcp_failover_state_t *state, |
1793 | enum failover_state new_state) | |
1794 | { | |
9f3da356 TL |
1795 | enum failover_state saved_state; |
1796 | TIME saved_stos; | |
31bbee78 TL |
1797 | struct pool *p; |
1798 | struct shared_network *s; | |
1799 | struct lease *l; | |
be62cf06 | 1800 | struct timeval tv; |
9f3da356 | 1801 | |
a55ccdd0 DH |
1802 | /* If we're in certain states where we're sending updates, and the peer |
1803 | * state changes, we need to re-schedule any pending updates just to | |
1804 | * be on the safe side. This results in retransmission. | |
1805 | */ | |
02ca1b45 | 1806 | switch (state -> me.state) { |
85a53735 | 1807 | case normal: |
a55ccdd0 DH |
1808 | case potential_conflict: |
1809 | case partner_down: | |
21d30347 SR |
1810 | /* Move the ack queue to the update queue */ |
1811 | dhcp_failover_rescind_updates(state); | |
1812 | ||
a55ccdd0 | 1813 | /* We will re-queue a timeout later, if applicable. */ |
85a53735 TL |
1814 | cancel_timeout (dhcp_failover_keepalive, state); |
1815 | break; | |
6ec59010 | 1816 | |
85a53735 TL |
1817 | default: |
1818 | break; | |
1819 | } | |
1820 | ||
9f3da356 | 1821 | /* Tentatively make the transition. */ |
02ca1b45 TL |
1822 | saved_state = state -> me.state; |
1823 | saved_stos = state -> me.stos; | |
d758ad8c TL |
1824 | |
1825 | /* Keep the old stos if we're going into recover_wait or if we're | |
1826 | coming into or out of startup. */ | |
1827 | if (new_state != recover_wait && new_state != startup && | |
1828 | saved_state != startup) | |
fd273e02 | 1829 | state -> me.stos = cur_time; |
d758ad8c TL |
1830 | |
1831 | /* If we're in shutdown, peer is in partner_down, and we're moving | |
1832 | to recover, we can skip waiting for MCLT to expire. This happens | |
1833 | when a server is moved administratively into shutdown prior to | |
1834 | actually shutting down. Of course, if there are any updates | |
1835 | pending we can't actually do this. */ | |
1836 | if (new_state == recover && saved_state == shut_down && | |
1837 | state -> partner.state == partner_down && | |
1838 | !state -> update_queue_head && !state -> ack_queue_head) | |
1839 | state -> me.stos = cur_time - state -> mclt; | |
1840 | ||
837d4342 | 1841 | state -> me.state = new_state; |
d758ad8c TL |
1842 | if (new_state == startup && saved_state != startup) |
1843 | state -> saved_state = saved_state; | |
9f3da356 | 1844 | |
d758ad8c | 1845 | /* If we can't record the new state, we can't make a state transition. */ |
9f3da356 | 1846 | if (!write_failover_state (state) || !commit_leases ()) { |
9f3da356 TL |
1847 | log_error ("Unable to record current failover state for %s", |
1848 | state -> name); | |
02ca1b45 TL |
1849 | state -> me.state = saved_state; |
1850 | state -> me.stos = saved_stos; | |
9f3da356 TL |
1851 | return ISC_R_IOERROR; |
1852 | } | |
1853 | ||
5f0c7be1 | 1854 | log_info ("failover peer %s: I move from %s to %s", |
9f3da356 | 1855 | state -> name, dhcp_failover_state_name_print (saved_state), |
02ca1b45 | 1856 | dhcp_failover_state_name_print (state -> me.state)); |
f88446f1 SR |
1857 | |
1858 | /* If both servers are now normal log it */ | |
1859 | if ((state->me.state == normal) && (state->partner.state == normal)) | |
1860 | log_info("failover peer %s: Both servers normal", state->name); | |
6ec59010 | 1861 | |
da292833 TL |
1862 | /* If we were in startup and we just left it, cancel the timeout. */ |
1863 | if (new_state != startup && saved_state == startup) | |
1864 | cancel_timeout (dhcp_failover_startup_timeout, state); | |
1865 | ||
9e3eb22a DH |
1866 | /* |
1867 | * If the state changes for any reason, cancel 'delayed auto state | |
1868 | * changes' (currently there is just the one). | |
1869 | */ | |
1870 | cancel_timeout(dhcp_failover_auto_partner_down, state); | |
1871 | ||
da292833 TL |
1872 | /* Set our service state. */ |
1873 | dhcp_failover_set_service_state (state); | |
1874 | ||
1875 | /* Tell the peer about it. */ | |
1876 | if (state -> link_to_peer) | |
1877 | dhcp_failover_send_state (state); | |
1878 | ||
fd273e02 | 1879 | switch (new_state) { |
9e3eb22a DH |
1880 | case communications_interrupted: |
1881 | /* | |
1882 | * There is an optional feature to automatically enter partner | |
1883 | * down after a timer expires, upon entering comms-interrupted. | |
1884 | * This feature is generally not safe except in specific | |
1885 | * circumstances. | |
1886 | * | |
1887 | * A zero value (also the default) disables it. | |
1888 | */ | |
1889 | if (state->auto_partner_down == 0) | |
1890 | break; | |
1891 | ||
1892 | #if defined (DEBUG_FAILOVER_TIMING) | |
f02c8db4 | 1893 | log_info("add_timeout +%lu dhcp_failover_auto_partner_down", |
9e3eb22a DH |
1894 | (unsigned long)state->auto_partner_down); |
1895 | #endif | |
1896 | tv.tv_sec = cur_time + state->auto_partner_down; | |
1897 | tv.tv_usec = 0; | |
1898 | add_timeout(&tv, dhcp_failover_auto_partner_down, state, | |
1899 | (tvref_t)omapi_object_reference, | |
1900 | (tvunref_t)omapi_object_dereference); | |
1901 | break; | |
1902 | ||
fd273e02 | 1903 | case normal: |
808d45fd | 1904 | /* Upon entering normal state, the server is expected to retransmit |
fc3b9c90 DH |
1905 | * all pending binding updates. This is a good opportunity to |
1906 | * rebalance the pool (potentially making new pending updates), | |
1907 | * which also schedules the next pool rebalance. | |
808d45fd | 1908 | */ |
fc3b9c90 | 1909 | dhcp_failover_pool_balance(state); |
808d45fd | 1910 | dhcp_failover_generate_update_queue(state, 0); |
616d67cb DH |
1911 | |
1912 | if (state->update_queue_tail != NULL) { | |
1913 | dhcp_failover_send_updates(state); | |
1914 | log_info("Sending updates to %s.", state->name); | |
1915 | } | |
1916 | ||
fd273e02 | 1917 | break; |
9e3eb22a | 1918 | |
fd273e02 | 1919 | case potential_conflict: |
21d30347 SR |
1920 | if ((state->i_am == primary) || |
1921 | ((state->i_am == secondary) && | |
1922 | (state->partner.state == conflict_done))) | |
fd273e02 TL |
1923 | dhcp_failover_send_update_request (state); |
1924 | break; | |
9e3eb22a | 1925 | |
fd273e02 | 1926 | case startup: |
0db87765 TL |
1927 | #if defined (DEBUG_FAILOVER_TIMING) |
1928 | log_info ("add_timeout +15 %s", | |
1929 | "dhcp_failover_startup_timeout"); | |
1930 | #endif | |
be62cf06 FD |
1931 | tv . tv_sec = cur_time + 15; |
1932 | tv . tv_usec = 0; | |
1933 | add_timeout (&tv, | |
fd273e02 TL |
1934 | dhcp_failover_startup_timeout, |
1935 | state, | |
1936 | (tvref_t)omapi_object_reference, | |
1937 | (tvunref_t) | |
1938 | omapi_object_dereference); | |
1939 | break; | |
6ec59010 | 1940 | |
fd273e02 TL |
1941 | /* If we come back in recover_wait and there's still waiting |
1942 | to do, set a timeout. */ | |
1943 | case recover_wait: | |
0db87765 TL |
1944 | if (state -> me.stos + state -> mclt > cur_time) { |
1945 | #if defined (DEBUG_FAILOVER_TIMING) | |
1946 | log_info ("add_timeout +%d %s", | |
1947 | (int)(cur_time - | |
1948 | state -> me.stos + state -> mclt), | |
1949 | "dhcp_failover_startup_timeout"); | |
1950 | #endif | |
be62cf06 FD |
1951 | tv . tv_sec = (int)(state -> me.stos + state -> mclt); |
1952 | tv . tv_usec = 0; | |
1953 | add_timeout (&tv, | |
fd273e02 TL |
1954 | dhcp_failover_recover_done, |
1955 | state, | |
1956 | (tvref_t)omapi_object_reference, | |
1957 | (tvunref_t) | |
1958 | omapi_object_dereference); | |
0db87765 | 1959 | } else |
d758ad8c | 1960 | dhcp_failover_recover_done (state); |
fd273e02 | 1961 | break; |
6ec59010 | 1962 | |
01c6e68a | 1963 | case recover: |
a55ccdd0 DH |
1964 | /* XXX: We're supposed to calculate if updreq or updreqall is |
1965 | * needed. In theory, we should only have to updreqall if we | |
1966 | * are positive we lost our stable storage. | |
1967 | */ | |
01c6e68a TL |
1968 | if (state -> link_to_peer) |
1969 | dhcp_failover_send_update_request_all (state); | |
1970 | break; | |
1971 | ||
31bbee78 TL |
1972 | case partner_down: |
1973 | /* For every expired lease, set a timeout for it to become free. */ | |
3933e2aa SR |
1974 | for (s = shared_networks; s; s = s->next) { |
1975 | for (p = s->pools; p; p = p->next) { | |
1976 | #if defined (BINARY_LEASES) | |
1977 | long int tiebreaker = 0; | |
1978 | #endif | |
1979 | if (p->failover_peer == state) { | |
1980 | for (l = LEASE_GET_FIRST(p->expired); | |
1981 | l != NULL; | |
1982 | l = LEASE_GET_NEXT(p->expired, l)) { | |
88cd8aca DH |
1983 | l->tsfp = state->me.stos + state->mclt; |
1984 | l->sort_time = (l->tsfp > l->ends) ? | |
1985 | l->tsfp : l->ends; | |
3933e2aa SR |
1986 | #if defined (BINARY_LEASES) |
1987 | /* If necessary fix up the tiebreaker so the leases | |
1988 | * maintain proper sort order. | |
1989 | */ | |
1990 | l->sort_tiebreaker = tiebreaker; | |
1991 | if (tiebreaker != LONG_MAX) | |
1992 | tiebreaker++; | |
1993 | #endif | |
1994 | ||
88cd8aca | 1995 | } |
88cd8aca | 1996 | |
3933e2aa SR |
1997 | l = LEASE_GET_FIRST(p->expired); |
1998 | if (l && (l->sort_time < p->next_event_time)) { | |
1999 | ||
2000 | p->next_event_time = l->sort_time; | |
0db87765 TL |
2001 | #if defined (DEBUG_FAILOVER_TIMING) |
2002 | log_info ("add_timeout +%d %s", | |
88cd8aca | 2003 | (int)(cur_time - p->next_event_time), |
0db87765 TL |
2004 | "pool_timer"); |
2005 | #endif | |
be62cf06 FD |
2006 | tv.tv_sec = p->next_event_time; |
2007 | tv.tv_usec = 0; | |
2008 | add_timeout(&tv, pool_timer, p, | |
88cd8aca DH |
2009 | (tvref_t)pool_reference, |
2010 | (tvunref_t)pool_dereference); | |
31bbee78 TL |
2011 | } |
2012 | } | |
2013 | } | |
2014 | } | |
2015 | break; | |
a55ccdd0 | 2016 | |
fd273e02 TL |
2017 | default: |
2018 | break; | |
85a53735 | 2019 | } |
9f3da356 | 2020 | |
85a53735 TL |
2021 | return ISC_R_SUCCESS; |
2022 | } | |
2023 | ||
5f0c7be1 TL |
2024 | isc_result_t dhcp_failover_peer_state_changed (dhcp_failover_state_t *state, |
2025 | failover_message_t *msg) | |
2026 | { | |
02ca1b45 TL |
2027 | enum failover_state previous_state = state -> partner.state; |
2028 | enum failover_state new_state; | |
2029 | int startupp; | |
5f0c7be1 | 2030 | |
02ca1b45 | 2031 | new_state = msg -> server_state; |
a55ccdd0 | 2032 | startupp = (msg -> server_flags & FTF_SERVER_STARTUP) ? 1 : 0; |
5f0c7be1 | 2033 | |
d07ccee3 TL |
2034 | if (state -> partner.state == new_state && state -> me.state) { |
2035 | switch (state -> me.state) { | |
2036 | case startup: | |
21d30347 SR |
2037 | /* |
2038 | * If we have a peer state we must be connected. | |
2039 | * If so we should move to potential_conflict | |
2040 | * instead of resolution_interrupted, otherwise | |
2041 | * back to whereever we were before we stopped. | |
2042 | */ | |
2043 | if (state->saved_state == resolution_interrupted) | |
2044 | dhcp_failover_set_state(state, | |
2045 | potential_conflict); | |
6ec59010 | 2046 | else |
21d30347 SR |
2047 | dhcp_failover_set_state(state, |
2048 | state->saved_state); | |
d07ccee3 TL |
2049 | return ISC_R_SUCCESS; |
2050 | ||
2051 | case unknown_state: | |
2052 | case normal: | |
2053 | case potential_conflict: | |
d07ccee3 TL |
2054 | case recover_done: |
2055 | case shut_down: | |
2056 | case paused: | |
2057 | case recover_wait: | |
2058 | return ISC_R_SUCCESS; | |
2059 | ||
2060 | /* If we get a peer state change when we're | |
2061 | disconnected, we always process it. */ | |
2062 | case partner_down: | |
2063 | case communications_interrupted: | |
2064 | case resolution_interrupted: | |
98311e4b | 2065 | case recover: |
a55ccdd0 DH |
2066 | case conflict_done: |
2067 | break; | |
2068 | ||
2069 | default: | |
2070 | log_fatal("Impossible case at %s:%d.", MDL); | |
d07ccee3 TL |
2071 | break; |
2072 | } | |
fd273e02 | 2073 | } |
da292833 | 2074 | |
02ca1b45 | 2075 | state -> partner.state = new_state; |
dceef873 | 2076 | state -> partner.stos = cur_time; |
5f0c7be1 TL |
2077 | |
2078 | log_info ("failover peer %s: peer moves from %s to %s", | |
2079 | state -> name, | |
2080 | dhcp_failover_state_name_print (previous_state), | |
02ca1b45 | 2081 | dhcp_failover_state_name_print (state -> partner.state)); |
f88446f1 SR |
2082 | |
2083 | /* If both servers are now normal log it */ | |
2084 | if ((state->me.state == normal) && (state->partner.state == normal)) | |
2085 | log_info("failover peer %s: Both servers normal", state->name); | |
6ec59010 | 2086 | |
5f0c7be1 TL |
2087 | if (!write_failover_state (state) || !commit_leases ()) { |
2088 | /* This is bad, but it's not fatal. Of course, if we | |
2089 | can't write to the lease database, we're not going to | |
2090 | get much done anyway. */ | |
2091 | log_error ("Unable to record current failover state for %s", | |
2092 | state -> name); | |
2093 | } | |
2094 | ||
a55ccdd0 DH |
2095 | /* Quickly validate the new state as being one of the 13 known |
2096 | * states. | |
2097 | */ | |
2098 | switch (new_state) { | |
2099 | case unknown_state: | |
2100 | case startup: | |
2101 | case normal: | |
2102 | case communications_interrupted: | |
2103 | case partner_down: | |
2104 | case potential_conflict: | |
2105 | case recover: | |
2106 | case paused: | |
2107 | case shut_down: | |
2108 | case recover_done: | |
2109 | case resolution_interrupted: | |
2110 | case conflict_done: | |
2111 | case recover_wait: | |
2112 | break; | |
2113 | ||
2114 | default: | |
2115 | log_error("failover peer %s: Invalid state: %d", state->name, | |
2116 | new_state); | |
2117 | dhcp_failover_set_state(state, shut_down); | |
2118 | return ISC_R_SUCCESS; | |
2119 | } | |
2120 | ||
5f0c7be1 TL |
2121 | /* Do any state transitions that are required as a result of the |
2122 | peer's state transition. */ | |
2123 | ||
02ca1b45 TL |
2124 | switch (state -> me.state == startup ? |
2125 | state -> saved_state : state -> me.state) { | |
5f0c7be1 TL |
2126 | case normal: |
2127 | switch (new_state) { | |
2128 | case normal: | |
da292833 TL |
2129 | dhcp_failover_state_pool_check (state); |
2130 | break; | |
2131 | ||
01c6e68a TL |
2132 | case partner_down: |
2133 | if (state -> me.state == startup) | |
2134 | dhcp_failover_set_state (state, recover); | |
2135 | else | |
2136 | dhcp_failover_set_state (state, | |
2137 | potential_conflict); | |
2138 | break; | |
2139 | ||
5f0c7be1 | 2140 | case potential_conflict: |
5f0c7be1 | 2141 | case resolution_interrupted: |
a55ccdd0 | 2142 | case conflict_done: |
da292833 | 2143 | /* None of these transitions should ever occur. */ |
a55ccdd0 DH |
2144 | log_error("Peer %s: Invalid state transition %s " |
2145 | "to %s.", state->name, | |
2146 | dhcp_failover_state_name_print(previous_state), | |
2147 | dhcp_failover_state_name_print(new_state)); | |
da292833 | 2148 | dhcp_failover_set_state (state, shut_down); |
5f0c7be1 | 2149 | break; |
da292833 | 2150 | |
a55ccdd0 | 2151 | case recover: |
5f0c7be1 | 2152 | case shut_down: |
5f0c7be1 | 2153 | dhcp_failover_set_state (state, partner_down); |
812022ff | 2154 | break; |
5f0c7be1 TL |
2155 | |
2156 | case paused: | |
2157 | dhcp_failover_set_state (state, | |
2158 | communications_interrupted); | |
2159 | break; | |
2160 | ||
a55ccdd0 DH |
2161 | default: |
2162 | /* recover_wait, recover_done, unknown_state, startup, | |
2163 | * communications_interrupted | |
2164 | */ | |
5f0c7be1 TL |
2165 | break; |
2166 | } | |
2167 | break; | |
2168 | ||
2169 | case recover: | |
2170 | switch (new_state) { | |
2171 | case recover: | |
755acf88 TL |
2172 | log_info ("failover peer %s: requesting %s", |
2173 | state -> name, "full update from peer"); | |
01c6e68a TL |
2174 | /* Don't send updreqall if we're really in the |
2175 | startup state, because that will result in two | |
2176 | being sent. */ | |
2177 | if (state -> me.state == recover) | |
2178 | dhcp_failover_send_update_request_all (state); | |
5f0c7be1 | 2179 | break; |
da292833 | 2180 | |
5f0c7be1 TL |
2181 | case potential_conflict: |
2182 | case resolution_interrupted: | |
a55ccdd0 | 2183 | case conflict_done: |
5f0c7be1 TL |
2184 | case normal: |
2185 | dhcp_failover_set_state (state, potential_conflict); | |
2186 | break; | |
2187 | ||
2188 | case partner_down: | |
2189 | case communications_interrupted: | |
2190 | /* We're supposed to send an update request at this | |
2191 | point. */ | |
2192 | /* XXX we don't currently have code here to do any | |
2193 | XXX clever detection of when we should send an | |
2194 | XXX UPDREQALL message rather than an UPDREQ | |
2195 | XXX message. What to do, what to do? */ | |
98311e4b DH |
2196 | /* Currently when we enter recover state, no matter |
2197 | * the reason, we send an UPDREQALL. So, it makes | |
2198 | * the most sense to stick to that until something | |
2199 | * better is done. | |
a55ccdd0 | 2200 | * Furthermore, we only want to send the update |
98311e4b DH |
2201 | * request if we are not in startup state. |
2202 | */ | |
2203 | if (state -> me.state == recover) | |
2204 | dhcp_failover_send_update_request_all (state); | |
5f0c7be1 TL |
2205 | break; |
2206 | ||
2207 | case shut_down: | |
2208 | /* XXX We're not explicitly told what to do in this | |
2209 | XXX case, but this transition is consistent with | |
2210 | XXX what is elsewhere in the draft. */ | |
2211 | dhcp_failover_set_state (state, partner_down); | |
2212 | break; | |
2213 | ||
2214 | /* We can't really do anything in this case. */ | |
a55ccdd0 DH |
2215 | default: |
2216 | /* paused, recover_done, recover_wait, unknown_state, | |
2217 | * startup. | |
2218 | */ | |
5f0c7be1 TL |
2219 | break; |
2220 | } | |
2221 | break; | |
2222 | ||
2223 | case potential_conflict: | |
2224 | switch (new_state) { | |
2225 | case normal: | |
a55ccdd0 DH |
2226 | /* This is an illegal transition. */ |
2227 | log_error("Peer %s moves to normal during conflict " | |
2228 | "resolution - panic, shutting down.", | |
2229 | state->name); | |
2230 | dhcp_failover_set_state(state, shut_down); | |
2231 | break; | |
2232 | ||
2233 | case conflict_done: | |
2234 | if (previous_state == potential_conflict) | |
5f0c7be1 | 2235 | dhcp_failover_send_update_request (state); |
a55ccdd0 DH |
2236 | else |
2237 | log_error("Peer %s: Unexpected move to " | |
2238 | "conflict-done.", state->name); | |
5f0c7be1 TL |
2239 | break; |
2240 | ||
5f0c7be1 | 2241 | case recover_done: |
fd273e02 | 2242 | case recover_wait: |
5f0c7be1 TL |
2243 | case potential_conflict: |
2244 | case partner_down: | |
2245 | case communications_interrupted: | |
2246 | case resolution_interrupted: | |
2247 | case paused: | |
2248 | break; | |
2249 | ||
da292833 TL |
2250 | case recover: |
2251 | dhcp_failover_set_state (state, recover); | |
2252 | break; | |
2253 | ||
5f0c7be1 TL |
2254 | case shut_down: |
2255 | dhcp_failover_set_state (state, partner_down); | |
2256 | break; | |
2257 | ||
a55ccdd0 DH |
2258 | default: |
2259 | /* unknown_state, startup */ | |
5f0c7be1 TL |
2260 | break; |
2261 | } | |
2262 | break; | |
2263 | ||
a55ccdd0 DH |
2264 | case conflict_done: |
2265 | switch (new_state) { | |
2266 | case normal: | |
2267 | case shut_down: | |
2268 | dhcp_failover_set_state(state, new_state); | |
2269 | break; | |
2270 | ||
21d30347 SR |
2271 | case potential_conflict: |
2272 | case resolution_interrupted: | |
2273 | /* | |
6ec59010 TM |
2274 | * This can happen when the connection is lost and |
2275 | * recovered after the primary has moved to | |
2276 | * conflict-done but the secondary is still in | |
2277 | * potential-conflict. In that case, we have to | |
21d30347 SR |
2278 | * remain in conflict-done. |
2279 | */ | |
2280 | break; | |
2281 | ||
a55ccdd0 DH |
2282 | default: |
2283 | log_fatal("Peer %s: Invalid attempt to move from %s " | |
2284 | "to %s while local state is conflict-done.", | |
2285 | state->name, | |
2286 | dhcp_failover_state_name_print(previous_state), | |
2287 | dhcp_failover_state_name_print(new_state)); | |
2288 | } | |
2289 | break; | |
2290 | ||
5f0c7be1 TL |
2291 | case partner_down: |
2292 | /* Take no action if other server is starting up. */ | |
2293 | if (startupp) | |
2294 | break; | |
2295 | ||
2296 | switch (new_state) { | |
2297 | /* This is where we should be. */ | |
2298 | case recover: | |
2036af06 | 2299 | case recover_wait: |
da292833 TL |
2300 | break; |
2301 | ||
5f0c7be1 | 2302 | case recover_done: |
da292833 | 2303 | dhcp_failover_set_state (state, normal); |
5f0c7be1 TL |
2304 | break; |
2305 | ||
2306 | case normal: | |
2307 | case potential_conflict: | |
2308 | case partner_down: | |
2309 | case communications_interrupted: | |
2310 | case resolution_interrupted: | |
a55ccdd0 | 2311 | case conflict_done: |
5f0c7be1 TL |
2312 | dhcp_failover_set_state (state, potential_conflict); |
2313 | break; | |
2314 | ||
a55ccdd0 DH |
2315 | default: |
2316 | /* shut_down, paused, unknown_state, startup */ | |
5f0c7be1 TL |
2317 | break; |
2318 | } | |
2319 | break; | |
2320 | ||
2321 | case communications_interrupted: | |
2322 | switch (new_state) { | |
5f0c7be1 TL |
2323 | case paused: |
2324 | /* Stick with the status quo. */ | |
2325 | break; | |
2326 | ||
da292833 | 2327 | /* If we're in communications-interrupted and an |
20ae1aff | 2328 | amnesic peer connects, go to the partner_down |
da292833 TL |
2329 | state immediately. */ |
2330 | case recover: | |
2331 | dhcp_failover_set_state (state, partner_down); | |
2332 | break; | |
2333 | ||
5f0c7be1 TL |
2334 | case normal: |
2335 | case communications_interrupted: | |
2336 | case recover_done: | |
fd273e02 | 2337 | case recover_wait: |
5f0c7be1 TL |
2338 | /* XXX so we don't need to do this specially in |
2339 | XXX the CONNECT and CONNECTACK handlers. */ | |
d758ad8c | 2340 | dhcp_failover_send_updates (state); |
5f0c7be1 TL |
2341 | dhcp_failover_set_state (state, normal); |
2342 | break; | |
2343 | ||
2344 | case potential_conflict: | |
2345 | case partner_down: | |
2346 | case resolution_interrupted: | |
a55ccdd0 | 2347 | case conflict_done: |
5f0c7be1 TL |
2348 | dhcp_failover_set_state (state, potential_conflict); |
2349 | break; | |
2350 | ||
2351 | case shut_down: | |
2352 | dhcp_failover_set_state (state, partner_down); | |
2353 | break; | |
2354 | ||
a55ccdd0 DH |
2355 | default: |
2356 | /* unknown_state, startup */ | |
5f0c7be1 TL |
2357 | break; |
2358 | } | |
2359 | break; | |
2360 | ||
2361 | case resolution_interrupted: | |
2362 | switch (new_state) { | |
2363 | case normal: | |
2364 | case recover: | |
2365 | case potential_conflict: | |
2366 | case partner_down: | |
2367 | case communications_interrupted: | |
2368 | case resolution_interrupted: | |
a55ccdd0 | 2369 | case conflict_done: |
5f0c7be1 | 2370 | case recover_done: |
fd273e02 | 2371 | case recover_wait: |
5f0c7be1 TL |
2372 | dhcp_failover_set_state (state, potential_conflict); |
2373 | break; | |
2374 | ||
2375 | case shut_down: | |
2376 | dhcp_failover_set_state (state, partner_down); | |
2377 | break; | |
2378 | ||
a55ccdd0 DH |
2379 | default: |
2380 | /* paused, unknown_state, startup */ | |
5f0c7be1 TL |
2381 | break; |
2382 | } | |
2383 | break; | |
2384 | ||
a55ccdd0 DH |
2385 | /* Make no transitions while in recover_wait...just wait. */ |
2386 | case recover_wait: | |
2387 | break; | |
2388 | ||
5f0c7be1 TL |
2389 | case recover_done: |
2390 | switch (new_state) { | |
da292833 | 2391 | case recover_done: |
a55ccdd0 | 2392 | log_error("Both servers have entered recover-done!"); |
a07d99bb TM |
2393 | /* Fall through and tranistion to normal anyway */ |
2394 | ||
a55ccdd0 | 2395 | case normal: |
5f0c7be1 TL |
2396 | dhcp_failover_set_state (state, normal); |
2397 | break; | |
2398 | ||
5f0c7be1 TL |
2399 | case shut_down: |
2400 | dhcp_failover_set_state (state, partner_down); | |
2401 | break; | |
2402 | ||
a55ccdd0 DH |
2403 | default: |
2404 | /* potential_conflict, partner_down, | |
2405 | * communications_interrupted, resolution_interrupted, | |
2406 | * paused, recover, recover_wait, unknown_state, | |
2407 | * startup. | |
2408 | */ | |
5f0c7be1 TL |
2409 | break; |
2410 | } | |
2411 | break; | |
2412 | ||
2413 | /* We are essentially dead in the water when we're in | |
2414 | either shut_down or paused states, and do not do any | |
2415 | automatic state transitions. */ | |
2416 | case shut_down: | |
2417 | case paused: | |
2418 | break; | |
2419 | ||
a55ccdd0 DH |
2420 | /* XXX: Shouldn't this be a fatal condition? */ |
2421 | case unknown_state: | |
2422 | break; | |
2423 | ||
2424 | default: | |
2425 | log_fatal("Impossible condition at %s:%d.", MDL); | |
fd273e02 TL |
2426 | break; |
2427 | ||
5f0c7be1 | 2428 | } |
02ca1b45 TL |
2429 | |
2430 | /* If we didn't make a transition out of startup as a result of | |
2431 | the peer's state change, do it now as a result of the fact that | |
2432 | we got a state change from the peer. */ | |
2433 | if (state -> me.state == startup && state -> saved_state != startup) | |
2434 | dhcp_failover_set_state (state, state -> saved_state); | |
6ec59010 | 2435 | |
5f0c7be1 TL |
2436 | /* For now, just set the service state based on the peer's state |
2437 | if necessary. */ | |
2438 | dhcp_failover_set_service_state (state); | |
2439 | ||
2440 | return ISC_R_SUCCESS; | |
2441 | } | |
2442 | ||
f71bc988 DH |
2443 | /* |
2444 | * Balance operation manual entry; startup, entrance to normal state. No | |
2445 | * sense sending a POOLREQ at this stage; the peer is likely about to schedule | |
2446 | * their own rebalance event upon entering normal themselves. | |
2447 | */ | |
fc3b9c90 DH |
2448 | static void |
2449 | dhcp_failover_pool_balance(dhcp_failover_state_t *state) | |
2450 | { | |
2451 | /* Cancel pending event. */ | |
2452 | cancel_timeout(dhcp_failover_pool_rebalance, state); | |
2453 | state->sched_balance = 0; | |
2454 | ||
f71bc988 | 2455 | dhcp_failover_pool_dobalance(state, NULL); |
fc3b9c90 DH |
2456 | } |
2457 | ||
f71bc988 DH |
2458 | /* |
2459 | * Balance operation entry from timer event. Once per timer interval is | |
2460 | * the only time we want to emit POOLREQs (asserting an interrupt in our | |
2461 | * peer). | |
2462 | */ | |
fc3b9c90 DH |
2463 | void |
2464 | dhcp_failover_pool_rebalance(void *failover_state) | |
8c8e27c5 | 2465 | { |
2426234f | 2466 | dhcp_failover_state_t *state; |
f71bc988 | 2467 | isc_boolean_t sendreq = ISC_FALSE; |
2426234f DH |
2468 | |
2469 | state = (dhcp_failover_state_t *)failover_state; | |
2470 | ||
fc3b9c90 DH |
2471 | /* Clear scheduled event indicator. */ |
2472 | state->sched_balance = 0; | |
2473 | ||
f71bc988 | 2474 | if (dhcp_failover_pool_dobalance(state, &sendreq)) |
2426234f | 2475 | dhcp_failover_send_updates(state); |
f71bc988 DH |
2476 | |
2477 | if (sendreq) | |
2478 | dhcp_failover_send_poolreq(state); | |
2426234f DH |
2479 | } |
2480 | ||
f71bc988 DH |
2481 | /* |
2482 | * Balance operation entry from POOLREQ protocol message. Do not permit a | |
2483 | * POOLREQ to send back a POOLREQ. Ping pong. | |
2484 | */ | |
fc3b9c90 DH |
2485 | static void |
2486 | dhcp_failover_pool_reqbalance(dhcp_failover_state_t *state) | |
2426234f DH |
2487 | { |
2488 | int queued; | |
2489 | ||
fc3b9c90 DH |
2490 | /* Cancel pending event. */ |
2491 | cancel_timeout(dhcp_failover_pool_rebalance, state); | |
2492 | state->sched_balance = 0; | |
2493 | ||
f71bc988 | 2494 | queued = dhcp_failover_pool_dobalance(state, NULL); |
2426234f DH |
2495 | |
2496 | dhcp_failover_send_poolresp(state, queued); | |
2497 | ||
2498 | if (queued) | |
2499 | dhcp_failover_send_updates(state); | |
2500 | else | |
2501 | log_info("peer %s: Got POOLREQ, answering negatively! " | |
2502 | "Peer may be out of leases or database inconsistent.", | |
2503 | state->name); | |
2504 | } | |
2505 | ||
f71bc988 DH |
2506 | /* |
2507 | * Do the meat of the work common to all forms of pool rebalance. If the | |
2508 | * caller deems it appropriate to transmit POOLREQ messages, it can use the | |
2509 | * sendreq pointer to pass in the address of a FALSE value which this function | |
2510 | * will conditionally turn TRUE if a POOLREQ is determined to be necessary. | |
2511 | * A NULL value may be passed, in which case no action is taken. | |
2512 | */ | |
2513 | static int | |
2514 | dhcp_failover_pool_dobalance(dhcp_failover_state_t *state, | |
2515 | isc_boolean_t *sendreq) | |
2426234f | 2516 | { |
f71bc988 | 2517 | int lts, total, thresh, hold, panic, pass; |
8c8e27c5 | 2518 | int leases_queued = 0; |
3933e2aa SR |
2519 | struct lease *lp = NULL; |
2520 | struct lease *next = NULL; | |
2521 | struct lease *ltemp = NULL; | |
8c8e27c5 TL |
2522 | struct shared_network *s; |
2523 | struct pool *p; | |
007e3ee4 | 2524 | binding_state_t peer_lease_state; |
dd9237c3 TM |
2525 | /* binding_state_t my_lease_state; */ |
2526 | /* XXX Why is this my_lease_state never used? */ | |
3933e2aa | 2527 | LEASE_STRUCT_PTR lq; |
a512cc3a | 2528 | int (*log_func)(const char *, ...); |
f71bc988 | 2529 | const char *result, *reqlog; |
8c8e27c5 | 2530 | |
2426234f | 2531 | if (state -> me.state != normal) |
8c8e27c5 TL |
2532 | return 0; |
2533 | ||
2426234f | 2534 | state->last_balance = cur_time; |
2426234f DH |
2535 | |
2536 | for (s = shared_networks ; s ; s = s->next) { | |
2537 | for (p = s->pools ; p ; p = p->next) { | |
2538 | if (p->failover_peer != state) | |
8c8e27c5 | 2539 | continue; |
007e3ee4 TL |
2540 | |
2541 | /* Right now we're giving the peer half of the free leases. | |
2542 | If we have more leases than the peer (i.e., more than | |
2543 | half), then the number of leases we have, less the number | |
2544 | of leases the peer has, will be how many more leases we | |
2545 | have than the peer has. So if we send half that number | |
2546 | to the peer, we should be even. */ | |
2426234f DH |
2547 | if (p->failover_peer->i_am == primary) { |
2548 | lts = (p->free_leases - p->backup_leases) / 2; | |
007e3ee4 | 2549 | peer_lease_state = FTS_BACKUP; |
dd9237c3 | 2550 | /* my_lease_state = FTS_FREE; */ |
2426234f | 2551 | lq = &p->free; |
007e3ee4 | 2552 | } else { |
2426234f | 2553 | lts = (p->backup_leases - p->free_leases) / 2; |
007e3ee4 | 2554 | peer_lease_state = FTS_FREE; |
dd9237c3 | 2555 | /* my_lease_state = FTS_BACKUP; */ |
2426234f DH |
2556 | lq = &p->backup; |
2557 | } | |
2558 | ||
2426234f DH |
2559 | total = p->backup_leases + p->free_leases; |
2560 | ||
2561 | thresh = ((total * state->max_lease_misbalance) + 50) / 100; | |
2562 | hold = ((total * state->max_lease_ownership) + 50) / 100; | |
2563 | ||
f71bc988 DH |
2564 | /* |
2565 | * If we need leases (so lts is negative) more than negative | |
2566 | * double the thresh%, panic and send poolreq to hopefully wake | |
2567 | * up the peer (but more likely the db is inconsistent). But, | |
2568 | * if this comes out zero, switch to -1 so that the POOLREQ is | |
2569 | * sent on lts == -2 rather than right away at -1. | |
2570 | * | |
2571 | * Note that we do not subtract -1 from panic all the time | |
2572 | * because thresh% and hold% may come out to the same number, | |
2573 | * and that is correct operation...where thresh% and hold% are | |
2574 | * both -1, we want to send poolreq when lts reaches -3. So, | |
2575 | * "-3 < -2", lts < panic. | |
2576 | */ | |
2577 | panic = thresh * -2; | |
2578 | ||
2579 | if (panic == 0) | |
2580 | panic = -1; | |
2581 | ||
2582 | if ((sendreq != NULL) && (lts < panic)) { | |
2583 | reqlog = " (requesting peer rebalance!)"; | |
2584 | *sendreq = ISC_TRUE; | |
2585 | } else | |
2586 | reqlog = ""; | |
2587 | ||
a512cc3a | 2588 | log_info("balancing pool %lx %s total %d free %d " |
f71bc988 | 2589 | "backup %d lts %d max-own (+/-)%d%s", |
a512cc3a DH |
2590 | (unsigned long)p, |
2591 | (p->shared_network ? | |
2592 | p->shared_network->name : ""), p->lease_count, | |
f71bc988 DH |
2593 | p->free_leases, p->backup_leases, lts, hold, |
2594 | reqlog); | |
8c8e27c5 | 2595 | |
2426234f DH |
2596 | /* In the first pass, try to allocate leases to the |
2597 | * peer which it would normally be responsible for (if | |
2598 | * the lease has a hardware address or client-identifier, | |
2599 | * and the load-balance-algorithm chooses the peer to | |
2600 | * answer that address), up to a hold% excess in the peer's | |
2601 | * favor. In the second pass, just send the oldest (first | |
2602 | * on the list) leases up to a hold% excess in our favor. | |
2603 | * | |
2604 | * This could make for additional pool rebalance | |
2605 | * events, but preserving MAC possession should be | |
2606 | * worth it. | |
2607 | */ | |
2608 | pass = 0; | |
3933e2aa | 2609 | lease_reference(&lp, LEASE_GET_FIRSTP(lq), MDL); |
007e3ee4 | 2610 | |
edb1283e | 2611 | while (lp) { |
007e3ee4 | 2612 | if (next) |
2426234f | 2613 | lease_dereference(&next, MDL); |
3933e2aa SR |
2614 | ltemp = LEASE_GET_NEXTP(lq, lp); |
2615 | if (ltemp != NULL) | |
2616 | lease_reference(&next, ltemp, MDL); | |
2426234f | 2617 | |
edb1283e DH |
2618 | /* |
2619 | * Stop if the pool is 'balanced enough.' | |
2620 | * | |
2621 | * The pool is balanced enough if: | |
2622 | * | |
2623 | * 1) We're on the first run through and the peer has | |
2624 | * its fair share of leases already (lts reaches | |
2625 | * -hold). | |
2626 | * 2) We're on the second run through, we are shifting | |
2627 | * never-used leases, and there is a perfectly even | |
2628 | * balance (lts reaches zero). | |
2629 | * 3) Second run through, we are shifting previously | |
2630 | * used leases, and the local system has its fair | |
2631 | * share but no more (lts reaches hold). | |
2632 | * | |
2633 | * Note that this is implemented below in 3,2,1 order. | |
2634 | */ | |
2635 | if (pass) { | |
2636 | if (lp->ends) { | |
2637 | if (lts <= hold) | |
2638 | break; | |
2639 | } else { | |
2640 | if (lts <= 0) | |
2641 | break; | |
2642 | } | |
2643 | } else if (lts <= -hold) | |
2644 | break; | |
2645 | ||
2426234f DH |
2646 | if (pass || peer_wants_lease(lp)) { |
2647 | --lts; | |
2648 | ++leases_queued; | |
2649 | lp->next_binding_state = peer_lease_state; | |
2650 | lp->tstp = cur_time; | |
2651 | lp->starts = cur_time; | |
2652 | ||
09dccd03 | 2653 | scrub_lease(lp, MDL); |
491bf4a2 | 2654 | if (!supersede_lease(lp, NULL, 0, 1, 0, 0) || |
2426234f DH |
2655 | !write_lease(lp)) |
2656 | log_error("can't commit lease %s on " | |
2657 | "giveaway", piaddr(lp->ip_addr)); | |
8c8e27c5 | 2658 | } |
007e3ee4 | 2659 | |
2426234f | 2660 | lease_dereference(&lp, MDL); |
007e3ee4 | 2661 | if (next) |
2426234f DH |
2662 | lease_reference(&lp, next, MDL); |
2663 | else if (!pass) { | |
2664 | pass = 1; | |
3933e2aa | 2665 | lease_reference(&lp, LEASE_GET_FIRSTP(lq), MDL); |
2426234f | 2666 | } |
8c8e27c5 | 2667 | } |
2426234f DH |
2668 | |
2669 | if (next) | |
2670 | lease_dereference(&next, MDL); | |
2671 | if (lp) | |
2672 | lease_dereference(&lp, MDL); | |
2673 | ||
a512cc3a DH |
2674 | if (lts > thresh) { |
2675 | result = "IMBALANCED"; | |
2676 | log_func = log_error; | |
2677 | } else { | |
2678 | result = "balanced"; | |
2679 | log_func = log_info; | |
2680 | } | |
2681 | ||
2682 | log_func("%s pool %lx %s total %d free %d backup %d " | |
2683 | "lts %d max-misbal %d", result, (unsigned long)p, | |
2684 | (p->shared_network ? | |
2685 | p->shared_network->name : ""), p->lease_count, | |
2686 | p->free_leases, p->backup_leases, lts, thresh); | |
6ec59010 | 2687 | |
2426234f DH |
2688 | /* Recalculate next rebalance event timer. */ |
2689 | dhcp_failover_pool_check(p); | |
8c8e27c5 TL |
2690 | } |
2691 | } | |
2426234f DH |
2692 | |
2693 | if (leases_queued) | |
2694 | commit_leases(); | |
2695 | ||
8c8e27c5 TL |
2696 | return leases_queued; |
2697 | } | |
2698 | ||
2426234f DH |
2699 | /* dhcp_failover_pool_check: Called whenever FREE or BACKUP leases change |
2700 | * states, on both servers. Check the scheduled time to rebalance the pool | |
2701 | * and lower it if applicable. | |
2702 | */ | |
2703 | void | |
2704 | dhcp_failover_pool_check(struct pool *pool) | |
8c8e27c5 | 2705 | { |
2426234f DH |
2706 | dhcp_failover_state_t *peer; |
2707 | TIME est1, est2; | |
be62cf06 | 2708 | struct timeval tv; |
3933e2aa | 2709 | struct lease *ltemp; |
8c8e27c5 | 2710 | |
2426234f DH |
2711 | peer = pool->failover_peer; |
2712 | ||
2713 | if(!peer || peer->me.state != normal) | |
2714 | return; | |
8c8e27c5 | 2715 | |
2426234f DH |
2716 | /* Estimate the time left until lease exhaustion. |
2717 | * The first lease on the backup or free lists is also the oldest | |
2718 | * lease. It is reasonable to guess that it will take at least | |
2719 | * as much time for a pool to run out of leases, as the present | |
2720 | * age of the oldest lease (seconds since it expired). | |
2721 | * | |
2722 | * Note that this isn't so sane of an assumption if the oldest | |
2723 | * lease is a virgin (ends = 0), we wind up sending this against | |
2724 | * the max_balance bounds check. | |
2725 | */ | |
3933e2aa SR |
2726 | ltemp = LEASE_GET_FIRST(pool->free); |
2727 | if(ltemp && ltemp->ends < cur_time) | |
2728 | est1 = cur_time - ltemp->ends; | |
007e3ee4 | 2729 | else |
2426234f DH |
2730 | est1 = 0; |
2731 | ||
3933e2aa SR |
2732 | ltemp = LEASE_GET_FIRST(pool->backup); |
2733 | if(ltemp && ltemp->ends < cur_time) | |
2734 | est2 = cur_time - ltemp->ends; | |
2426234f DH |
2735 | else |
2736 | est2 = 0; | |
2737 | ||
2738 | /* We don't want to schedule rebalance for when we think we'll run | |
2739 | * out of leases, we want to schedule the rebalance for when we think | |
2740 | * the disparity will be 'large enough' to warrant action. | |
2741 | */ | |
2742 | est1 = ((est1 * peer->max_lease_misbalance) + 50) / 100; | |
2743 | est2 = ((est2 * peer->max_lease_misbalance) + 50) / 100; | |
2744 | ||
2745 | /* Guess when the local system will begin issuing POOLREQ panic | |
2746 | * attacks because "max_lease_misbalance*2" has been exceeded. | |
2747 | */ | |
2748 | if(peer->i_am == primary) | |
2749 | est1 *= 2; | |
2750 | else | |
2751 | est2 *= 2; | |
2752 | ||
2753 | /* Select the smallest time. */ | |
2754 | if(est1 > est2) | |
2755 | est1 = est2; | |
2756 | ||
2757 | /* Bounded by the maximum configured value. */ | |
2758 | if(est1 > peer->max_balance) | |
2759 | est1 = peer->max_balance; | |
2760 | ||
2761 | /* Project this time into the future. */ | |
2762 | est1 += cur_time; | |
2763 | ||
2764 | /* Do not move the time down under the minimum. */ | |
2765 | est2 = peer->last_balance + peer->min_balance; | |
2766 | if(peer->last_balance && (est1 < est2)) | |
2767 | est1 = est2; | |
2768 | ||
a512cc3a DH |
2769 | /* Introduce a random delay. */ |
2770 | est1 += random() % 5; | |
2771 | ||
2426234f DH |
2772 | /* Do not move the time forward, or reset to the same time. */ |
2773 | if(peer->sched_balance) { | |
2774 | if (est1 >= peer->sched_balance) | |
2775 | return; | |
2776 | ||
2777 | /* We are about to schedule the time down, cancel the | |
2778 | * current timeout. | |
2779 | */ | |
2780 | cancel_timeout(dhcp_failover_pool_rebalance, peer); | |
8c8e27c5 | 2781 | } |
2426234f DH |
2782 | |
2783 | /* The time is different, and lower, use it. */ | |
2784 | peer->sched_balance = est1; | |
2785 | ||
2786 | #if defined(DEBUG_FAILOVER_TIMING) | |
2787 | log_info("add_timeout +%d dhcp_failover_pool_rebalance", | |
1387545f | 2788 | (int)(est1 - cur_time)); |
2426234f | 2789 | #endif |
be62cf06 FD |
2790 | tv.tv_sec = est1; |
2791 | tv.tv_usec = 0; | |
2792 | add_timeout(&tv, dhcp_failover_pool_rebalance, peer, | |
2426234f DH |
2793 | (tvref_t)dhcp_failover_state_reference, |
2794 | (tvunref_t)dhcp_failover_state_dereference); | |
8c8e27c5 TL |
2795 | } |
2796 | ||
2797 | int dhcp_failover_state_pool_check (dhcp_failover_state_t *state) | |
2798 | { | |
8c8e27c5 TL |
2799 | struct shared_network *s; |
2800 | struct pool *p; | |
2801 | ||
2802 | for (s = shared_networks; s; s = s -> next) { | |
2803 | for (p = s -> pools; p; p = p -> next) { | |
2804 | if (p -> failover_peer != state) | |
2805 | continue; | |
2426234f | 2806 | dhcp_failover_pool_check (p); |
8c8e27c5 TL |
2807 | } |
2808 | } | |
2809 | return 0; | |
2810 | } | |
2811 | ||
9f3da356 TL |
2812 | isc_result_t dhcp_failover_send_updates (dhcp_failover_state_t *state) |
2813 | { | |
84fe3bd0 | 2814 | struct lease *lp = (struct lease *)0; |
9f3da356 TL |
2815 | isc_result_t status; |
2816 | ||
8c8e27c5 | 2817 | /* Can't update peer if we're not talking to it! */ |
01c6e68a | 2818 | if (!state -> link_to_peer) |
8c8e27c5 TL |
2819 | return ISC_R_SUCCESS; |
2820 | ||
20ae1aff | 2821 | /* If there are acks pending, transmit them prior to potentially |
a512cc3a DH |
2822 | * sending new updates for the same lease. |
2823 | */ | |
2824 | if (state->toack_queue_head != NULL) | |
2825 | dhcp_failover_send_acks(state); | |
2826 | ||
02ca1b45 TL |
2827 | while ((state -> partner.max_flying_updates > |
2828 | state -> cur_unacked_updates) && state -> update_queue_head) { | |
25a69ca1 | 2829 | /* Grab the head of the update queue. */ |
20916cae | 2830 | lease_reference (&lp, state -> update_queue_head, MDL); |
84fe3bd0 TL |
2831 | |
2832 | /* Send the update to the peer. */ | |
2833 | status = dhcp_failover_send_bind_update (state, lp); | |
2834 | if (status != ISC_R_SUCCESS) { | |
20916cae | 2835 | lease_dereference (&lp, MDL); |
84fe3bd0 TL |
2836 | return status; |
2837 | } | |
25a69ca1 | 2838 | lp -> flags &= ~ON_UPDATE_QUEUE; |
84fe3bd0 | 2839 | |
25a69ca1 TL |
2840 | /* Take it off the head of the update queue and put the next |
2841 | item in the update queue at the head. */ | |
20916cae | 2842 | lease_dereference (&state -> update_queue_head, MDL); |
9f3da356 | 2843 | if (lp -> next_pending) { |
20916cae TL |
2844 | lease_reference (&state -> update_queue_head, |
2845 | lp -> next_pending, MDL); | |
2846 | lease_dereference (&lp -> next_pending, MDL); | |
9f3da356 | 2847 | } else { |
20916cae | 2848 | lease_dereference (&state -> update_queue_tail, MDL); |
9f3da356 | 2849 | } |
84fe3bd0 | 2850 | |
9f3da356 | 2851 | if (state -> ack_queue_head) { |
20916cae TL |
2852 | lease_reference |
2853 | (&state -> ack_queue_tail -> next_pending, | |
2854 | lp, MDL); | |
2855 | lease_dereference (&state -> ack_queue_tail, MDL); | |
9f3da356 | 2856 | } else { |
20916cae | 2857 | lease_reference (&state -> ack_queue_head, lp, MDL); |
9f3da356 | 2858 | } |
da292833 TL |
2859 | #if defined (POINTER_DEBUG) |
2860 | if (lp -> next_pending) { | |
2861 | log_error ("ack_queue_tail: lp -> next_pending"); | |
2862 | abort (); | |
2863 | } | |
2864 | #endif | |
20916cae | 2865 | lease_reference (&state -> ack_queue_tail, lp, MDL); |
25a69ca1 | 2866 | lp -> flags |= ON_ACK_QUEUE; |
20916cae | 2867 | lease_dereference (&lp, MDL); |
9f3da356 TL |
2868 | |
2869 | /* Count the object as an unacked update. */ | |
2870 | state -> cur_unacked_updates++; | |
2871 | } | |
2872 | return ISC_R_SUCCESS; | |
2873 | } | |
2874 | ||
2875 | /* Queue an update for a lease. Always returns 1 at this point - it's | |
2876 | not an error for this to be called on a lease for which there's no | |
2877 | failover peer. */ | |
2878 | ||
007e3ee4 | 2879 | int dhcp_failover_queue_update (struct lease *lease, int immediate) |
9f3da356 TL |
2880 | { |
2881 | dhcp_failover_state_t *state; | |
2882 | ||
2883 | if (!lease -> pool || | |
2884 | !lease -> pool -> failover_peer) | |
2885 | return 1; | |
2886 | ||
25a69ca1 TL |
2887 | /* If it's already on the update queue, leave it there. */ |
2888 | if (lease -> flags & ON_UPDATE_QUEUE) | |
2889 | return 1; | |
2890 | ||
2891 | /* Get the failover state structure for this lease. */ | |
9f3da356 | 2892 | state = lease -> pool -> failover_peer; |
25a69ca1 TL |
2893 | |
2894 | /* If it's on the ack queue, take it off. */ | |
2895 | if (lease -> flags & ON_ACK_QUEUE) | |
2896 | dhcp_failover_ack_queue_remove (state, lease); | |
2897 | ||
9f3da356 | 2898 | if (state -> update_queue_head) { |
20916cae TL |
2899 | lease_reference (&state -> update_queue_tail -> next_pending, |
2900 | lease, MDL); | |
2901 | lease_dereference (&state -> update_queue_tail, MDL); | |
9f3da356 | 2902 | } else { |
20916cae | 2903 | lease_reference (&state -> update_queue_head, lease, MDL); |
9f3da356 | 2904 | } |
294d641e | 2905 | #if defined (POINTER_DEBUG) |
da292833 TL |
2906 | if (lease -> next_pending) { |
2907 | log_error ("next pending on update queue lease."); | |
755acf88 | 2908 | #if defined (DEBUG_RC_HISTORY) |
d758ad8c | 2909 | dump_rc_history (lease); |
755acf88 | 2910 | #endif |
da292833 TL |
2911 | abort (); |
2912 | } | |
294d641e | 2913 | #endif |
20916cae | 2914 | lease_reference (&state -> update_queue_tail, lease, MDL); |
25a69ca1 | 2915 | lease -> flags |= ON_UPDATE_QUEUE; |
007e3ee4 TL |
2916 | if (immediate) |
2917 | dhcp_failover_send_updates (state); | |
9f3da356 TL |
2918 | return 1; |
2919 | } | |
2920 | ||
12fd6075 TL |
2921 | int dhcp_failover_send_acks (dhcp_failover_state_t *state) |
2922 | { | |
988c1ca7 DN |
2923 | failover_message_t *msg = (failover_message_t *)0; |
2924 | ||
2925 | /* Must commit all leases prior to acking them. */ | |
2926 | if (!commit_leases ()) | |
2927 | return 0; | |
2928 | ||
2929 | while (state -> toack_queue_head) { | |
2930 | failover_message_reference | |
2931 | (&msg, state -> toack_queue_head, MDL); | |
2932 | failover_message_dereference | |
2933 | (&state -> toack_queue_head, MDL); | |
2934 | if (msg -> next) { | |
2935 | failover_message_reference | |
2936 | (&state -> toack_queue_head, msg -> next, MDL); | |
2937 | } | |
2938 | ||
2939 | dhcp_failover_send_bind_ack (state, msg, 0, (const char *)0); | |
2940 | ||
2941 | failover_message_dereference (&msg, MDL); | |
2942 | } | |
2943 | ||
fa0b4709 BC |
2944 | if (state -> toack_queue_tail) |
2945 | failover_message_dereference (&state -> toack_queue_tail, MDL); | |
988c1ca7 DN |
2946 | state -> pending_acks = 0; |
2947 | ||
2948 | return 1; | |
2949 | } | |
2950 | ||
12fd6075 TL |
2951 | void dhcp_failover_toack_queue_timeout (void *vs) |
2952 | { | |
988c1ca7 | 2953 | dhcp_failover_state_t *state = vs; |
0db87765 TL |
2954 | |
2955 | #if defined (DEBUG_FAILOVER_TIMING) | |
2956 | log_info ("dhcp_failover_toack_queue_timeout"); | |
2957 | #endif | |
2958 | ||
988c1ca7 DN |
2959 | dhcp_failover_send_acks (state); |
2960 | } | |
2961 | ||
2962 | /* Queue an ack for a message. There is currently no way to queue a | |
2963 | negative ack -- these need to be sent directly. */ | |
2964 | ||
2965 | int dhcp_failover_queue_ack (dhcp_failover_state_t *state, | |
2966 | failover_message_t *msg) | |
2967 | { | |
be62cf06 FD |
2968 | struct timeval tv; |
2969 | ||
988c1ca7 DN |
2970 | if (state -> toack_queue_head) { |
2971 | failover_message_reference | |
2972 | (&state -> toack_queue_tail -> next, msg, MDL); | |
2973 | failover_message_dereference (&state -> toack_queue_tail, MDL); | |
2974 | } else { | |
2975 | failover_message_reference (&state -> toack_queue_head, | |
2976 | msg, MDL); | |
2977 | } | |
2978 | failover_message_reference (&state -> toack_queue_tail, msg, MDL); | |
2979 | ||
2980 | state -> pending_acks++; | |
2981 | ||
2982 | /* Flush the toack queue whenever we exceed half the number of | |
2983 | allowed unacked updates. */ | |
2984 | if (state -> pending_acks >= state -> partner.max_flying_updates / 2) { | |
2985 | dhcp_failover_send_acks (state); | |
2986 | } | |
2987 | ||
2988 | /* Schedule a timeout to flush the ack queue. */ | |
2989 | if (state -> pending_acks > 0) { | |
0db87765 TL |
2990 | #if defined (DEBUG_FAILOVER_TIMING) |
2991 | log_info ("add_timeout +2 %s", | |
2992 | "dhcp_failover_toack_queue_timeout"); | |
2993 | #endif | |
be62cf06 FD |
2994 | tv . tv_sec = cur_time + 2; |
2995 | tv . tv_usec = 0; | |
2996 | add_timeout (&tv, | |
988c1ca7 DN |
2997 | dhcp_failover_toack_queue_timeout, state, |
2998 | (tvref_t)dhcp_failover_state_reference, | |
2999 | (tvunref_t)dhcp_failover_state_dereference); | |
3000 | } | |
3001 | ||
988c1ca7 DN |
3002 | return 1; |
3003 | } | |
3004 | ||
25a69ca1 TL |
3005 | void dhcp_failover_ack_queue_remove (dhcp_failover_state_t *state, |
3006 | struct lease *lease) | |
3007 | { | |
3008 | struct lease *lp; | |
3009 | ||
999992c9 TL |
3010 | if (!(lease -> flags & ON_ACK_QUEUE)) |
3011 | return; | |
3012 | ||
25a69ca1 | 3013 | if (state -> ack_queue_head == lease) { |
20916cae | 3014 | lease_dereference (&state -> ack_queue_head, MDL); |
25a69ca1 | 3015 | if (lease -> next_pending) { |
20916cae TL |
3016 | lease_reference (&state -> ack_queue_head, |
3017 | lease -> next_pending, MDL); | |
6f0b9ed0 | 3018 | lease_dereference (&lease -> next_pending, MDL); |
25a69ca1 | 3019 | } else { |
20916cae | 3020 | lease_dereference (&state -> ack_queue_tail, MDL); |
25a69ca1 | 3021 | } |
988c1ca7 DN |
3022 | } else { |
3023 | for (lp = state -> ack_queue_head; | |
3024 | lp && lp -> next_pending != lease; | |
3025 | lp = lp -> next_pending) | |
3026 | ; | |
3027 | ||
3028 | if (!lp) | |
3029 | return; | |
3030 | ||
20916cae | 3031 | lease_dereference (&lp -> next_pending, MDL); |
6f0b9ed0 | 3032 | if (lease -> next_pending) { |
20916cae TL |
3033 | lease_reference (&lp -> next_pending, |
3034 | lease -> next_pending, MDL); | |
6f0b9ed0 TL |
3035 | lease_dereference (&lease -> next_pending, MDL); |
3036 | } else { | |
20916cae | 3037 | lease_dereference (&state -> ack_queue_tail, MDL); |
da292833 TL |
3038 | if (lp -> next_pending) { |
3039 | log_error ("state -> ack_queue_tail"); | |
3040 | abort (); | |
3041 | } | |
20916cae | 3042 | lease_reference (&state -> ack_queue_tail, lp, MDL); |
25a69ca1 TL |
3043 | } |
3044 | } | |
988c1ca7 | 3045 | |
25a69ca1 | 3046 | lease -> flags &= ~ON_ACK_QUEUE; |
808d45fd DH |
3047 | /* Multiple acks on one XID is an error and may cause badness. */ |
3048 | lease->last_xid = 0; | |
3049 | /* XXX: this violates draft-failover. We can't send another | |
3050 | * update just because we forgot about an old one that hasn't | |
3051 | * been acked yet. | |
3052 | */ | |
6f0b9ed0 | 3053 | state -> cur_unacked_updates--; |
988c1ca7 DN |
3054 | |
3055 | /* | |
3056 | * When updating leases as a result of an ack, we defer the commit | |
3057 | * for performance reasons. When there are no more acks pending, | |
3058 | * do a commit. | |
3059 | */ | |
3060 | if (state -> cur_unacked_updates == 0) { | |
3061 | commit_leases(); | |
3062 | } | |
25a69ca1 TL |
3063 | } |
3064 | ||
d50d0b82 | 3065 | isc_result_t dhcp_failover_state_set_value (omapi_object_t *h, |
85a53735 TL |
3066 | omapi_object_t *id, |
3067 | omapi_data_string_t *name, | |
3068 | omapi_typed_data_t *value) | |
d50d0b82 | 3069 | { |
311dbab6 DN |
3070 | isc_result_t status; |
3071 | ||
d50d0b82 | 3072 | if (h -> type != dhcp_type_failover_state) |
98bf1607 | 3073 | return DHCP_R_INVALIDARG; |
311dbab6 DN |
3074 | |
3075 | /* This list of successful returns is completely wrong, but the | |
3076 | fastest way to make dhcpctl do something vaguely sane when | |
3077 | you try to change the local state. */ | |
3078 | ||
3079 | if (!omapi_ds_strcmp (name, "name")) { | |
3080 | return ISC_R_SUCCESS; | |
311dbab6 DN |
3081 | } else if (!omapi_ds_strcmp (name, "partner-address")) { |
3082 | return ISC_R_SUCCESS; | |
3083 | } else if (!omapi_ds_strcmp (name, "local-address")) { | |
3084 | return ISC_R_SUCCESS; | |
3085 | } else if (!omapi_ds_strcmp (name, "partner-port")) { | |
3086 | return ISC_R_SUCCESS; | |
3087 | } else if (!omapi_ds_strcmp (name, "local-port")) { | |
3088 | return ISC_R_SUCCESS; | |
3089 | } else if (!omapi_ds_strcmp (name, "max-outstanding-updates")) { | |
3090 | return ISC_R_SUCCESS; | |
3091 | } else if (!omapi_ds_strcmp (name, "mclt")) { | |
3092 | return ISC_R_SUCCESS; | |
3093 | } else if (!omapi_ds_strcmp (name, "load-balance-max-secs")) { | |
3094 | return ISC_R_SUCCESS; | |
3095 | } else if (!omapi_ds_strcmp (name, "load-balance-hba")) { | |
3096 | return ISC_R_SUCCESS; | |
3097 | } else if (!omapi_ds_strcmp (name, "partner-state")) { | |
3098 | return ISC_R_SUCCESS; | |
3099 | } else if (!omapi_ds_strcmp (name, "local-state")) { | |
7c6a9da0 | 3100 | unsigned long l; |
311dbab6 DN |
3101 | status = omapi_get_int_value (&l, value); |
3102 | if (status != ISC_R_SUCCESS) | |
3103 | return status; | |
3104 | return dhcp_failover_set_state ((dhcp_failover_state_t *)h, l); | |
3105 | } else if (!omapi_ds_strcmp (name, "partner-stos")) { | |
3106 | return ISC_R_SUCCESS; | |
3107 | } else if (!omapi_ds_strcmp (name, "local-stos")) { | |
3108 | return ISC_R_SUCCESS; | |
3109 | } else if (!omapi_ds_strcmp (name, "hierarchy")) { | |
3110 | return ISC_R_SUCCESS; | |
3111 | } else if (!omapi_ds_strcmp (name, "last-packet-sent")) { | |
3112 | return ISC_R_SUCCESS; | |
3113 | } else if (!omapi_ds_strcmp (name, "last-timestamp-received")) { | |
3114 | return ISC_R_SUCCESS; | |
3115 | } else if (!omapi_ds_strcmp (name, "skew")) { | |
3116 | return ISC_R_SUCCESS; | |
3117 | } else if (!omapi_ds_strcmp (name, "max-response-delay")) { | |
3118 | return ISC_R_SUCCESS; | |
3119 | } else if (!omapi_ds_strcmp (name, "cur-unacked-updates")) { | |
3120 | return ISC_R_SUCCESS; | |
3121 | } | |
6ec59010 | 3122 | |
d50d0b82 TL |
3123 | if (h -> inner && h -> inner -> type -> set_value) |
3124 | return (*(h -> inner -> type -> set_value)) | |
3125 | (h -> inner, id, name, value); | |
3126 | return ISC_R_NOTFOUND; | |
3127 | } | |
3128 | ||
85a53735 TL |
3129 | void dhcp_failover_keepalive (void *vs) |
3130 | { | |
85a53735 TL |
3131 | } |
3132 | ||
9f3da356 TL |
3133 | void dhcp_failover_reconnect (void *vs) |
3134 | { | |
3135 | dhcp_failover_state_t *state = vs; | |
3136 | isc_result_t status; | |
be62cf06 | 3137 | struct timeval tv; |
9f3da356 | 3138 | |
0db87765 TL |
3139 | #if defined (DEBUG_FAILOVER_TIMING) |
3140 | log_info ("dhcp_failover_reconnect"); | |
3141 | #endif | |
da292833 TL |
3142 | /* If we already connected the other way, let the connection |
3143 | recovery code initiate any retry that may be required. */ | |
3144 | if (state -> link_to_peer) | |
3145 | return; | |
3146 | ||
9f3da356 | 3147 | status = dhcp_failover_link_initiate ((omapi_object_t *)state); |
98bf1607 | 3148 | if (status != ISC_R_SUCCESS && status != DHCP_R_INCOMPLETE) { |
9f3da356 TL |
3149 | log_info ("failover peer %s: %s", state -> name, |
3150 | isc_result_totext (status)); | |
0db87765 | 3151 | #if defined (DEBUG_FAILOVER_TIMING) |
dedde1ba | 3152 | log_info("add_timeout +90 dhcp_failover_reconnect"); |
0db87765 | 3153 | #endif |
be62cf06 FD |
3154 | tv . tv_sec = cur_time + 90; |
3155 | tv . tv_usec = 0; | |
dedde1ba DH |
3156 | add_timeout(&tv, dhcp_failover_reconnect, state, |
3157 | (tvref_t)dhcp_failover_state_reference, | |
3158 | (tvunref_t)dhcp_failover_state_dereference); | |
9f3da356 TL |
3159 | } |
3160 | } | |
3161 | ||
5f0c7be1 TL |
3162 | void dhcp_failover_startup_timeout (void *vs) |
3163 | { | |
3164 | dhcp_failover_state_t *state = vs; | |
5f0c7be1 | 3165 | |
0db87765 TL |
3166 | #if defined (DEBUG_FAILOVER_TIMING) |
3167 | log_info ("dhcp_failover_startup_timeout"); | |
3168 | #endif | |
3169 | ||
02ca1b45 TL |
3170 | dhcp_failover_state_transition (state, "disconnect"); |
3171 | } | |
3172 | ||
3173 | void dhcp_failover_link_startup_timeout (void *vl) | |
3174 | { | |
3175 | dhcp_failover_link_t *link = vl; | |
02ca1b45 TL |
3176 | omapi_object_t *p; |
3177 | ||
3178 | for (p = (omapi_object_t *)link; p -> inner; p = p -> inner) | |
3179 | ; | |
3180 | for (; p; p = p -> outer) | |
3181 | if (p -> type == omapi_type_connection) | |
3182 | break; | |
3183 | if (p) { | |
da292833 | 3184 | log_info ("failover: link startup timeout"); |
02ca1b45 TL |
3185 | omapi_disconnect (p, 1); |
3186 | } | |
5f0c7be1 TL |
3187 | } |
3188 | ||
9f3da356 TL |
3189 | void dhcp_failover_listener_restart (void *vs) |
3190 | { | |
3191 | dhcp_failover_state_t *state = vs; | |
3192 | isc_result_t status; | |
be62cf06 | 3193 | struct timeval tv; |
9f3da356 | 3194 | |
0db87765 TL |
3195 | #if defined (DEBUG_FAILOVER_TIMING) |
3196 | log_info ("dhcp_failover_listener_restart"); | |
3197 | #endif | |
3198 | ||
9f3da356 TL |
3199 | status = dhcp_failover_listen ((omapi_object_t *)state); |
3200 | if (status != ISC_R_SUCCESS) { | |
3201 | log_info ("failover peer %s: %s", state -> name, | |
3202 | isc_result_totext (status)); | |
0db87765 TL |
3203 | #if defined (DEBUG_FAILOVER_TIMING) |
3204 | log_info ("add_timeout +90 %s", | |
3205 | "dhcp_failover_listener_restart"); | |
3206 | #endif | |
be62cf06 FD |
3207 | tv . tv_sec = cur_time + 90; |
3208 | tv . tv_usec = 0; | |
3209 | add_timeout (&tv, | |
20916cae TL |
3210 | dhcp_failover_listener_restart, state, |
3211 | (tvref_t)dhcp_failover_state_reference, | |
3212 | (tvunref_t)dhcp_failover_state_dereference); | |
9f3da356 TL |
3213 | } |
3214 | } | |
3215 | ||
9e3eb22a DH |
3216 | void |
3217 | dhcp_failover_auto_partner_down(void *vs) | |
3218 | { | |
3219 | dhcp_failover_state_t *state = vs; | |
3220 | ||
3221 | #if defined (DEBUG_FAILOVER_TIMING) | |
3222 | log_info("dhcp_failover_auto_partner_down"); | |
3223 | #endif | |
3224 | ||
3225 | dhcp_failover_set_state(state, partner_down); | |
3226 | } | |
3227 | ||
d50d0b82 | 3228 | isc_result_t dhcp_failover_state_get_value (omapi_object_t *h, |
85a53735 TL |
3229 | omapi_object_t *id, |
3230 | omapi_data_string_t *name, | |
3231 | omapi_value_t **value) | |
d50d0b82 | 3232 | { |
85a53735 TL |
3233 | dhcp_failover_state_t *s; |
3234 | struct option_cache *oc; | |
3235 | struct data_string ds; | |
3236 | isc_result_t status; | |
3237 | ||
d50d0b82 | 3238 | if (h -> type != dhcp_type_failover_state) |
98bf1607 | 3239 | return DHCP_R_INVALIDARG; |
85a53735 | 3240 | s = (dhcp_failover_state_t *)h; |
6ec59010 | 3241 | |
85a53735 TL |
3242 | if (!omapi_ds_strcmp (name, "name")) { |
3243 | if (s -> name) | |
3244 | return omapi_make_string_value (value, | |
3245 | name, s -> name, MDL); | |
3246 | return ISC_R_NOTFOUND; | |
3247 | } else if (!omapi_ds_strcmp (name, "partner-address")) { | |
02ca1b45 | 3248 | oc = s -> partner.address; |
85a53735 TL |
3249 | getaddr: |
3250 | memset (&ds, 0, sizeof ds); | |
3251 | if (!evaluate_option_cache (&ds, (struct packet *)0, | |
3252 | (struct lease *)0, | |
9e383163 | 3253 | (struct client_state *)0, |
85a53735 TL |
3254 | (struct option_state *)0, |
3255 | (struct option_state *)0, | |
3256 | &global_scope, oc, MDL)) { | |
3257 | return ISC_R_NOTFOUND; | |
3258 | } | |
3259 | status = omapi_make_const_value (value, | |
3260 | name, ds.data, ds.len, MDL); | |
9f3da356 | 3261 | /* Disgusting kludge: */ |
02ca1b45 | 3262 | if (oc == s -> me.address && !s -> server_identifier.len) |
9f3da356 | 3263 | data_string_copy (&s -> server_identifier, &ds, MDL); |
85a53735 TL |
3264 | data_string_forget (&ds, MDL); |
3265 | return status; | |
3266 | } else if (!omapi_ds_strcmp (name, "local-address")) { | |
02ca1b45 | 3267 | oc = s -> me.address; |
85a53735 TL |
3268 | goto getaddr; |
3269 | } else if (!omapi_ds_strcmp (name, "partner-port")) { | |
02ca1b45 TL |
3270 | return omapi_make_int_value (value, name, |
3271 | s -> partner.port, MDL); | |
85a53735 TL |
3272 | } else if (!omapi_ds_strcmp (name, "local-port")) { |
3273 | return omapi_make_int_value (value, | |
02ca1b45 | 3274 | name, s -> me.port, MDL); |
85a53735 TL |
3275 | } else if (!omapi_ds_strcmp (name, "max-outstanding-updates")) { |
3276 | return omapi_make_uint_value (value, name, | |
02ca1b45 TL |
3277 | s -> me.max_flying_updates, |
3278 | MDL); | |
85a53735 TL |
3279 | } else if (!omapi_ds_strcmp (name, "mclt")) { |
3280 | return omapi_make_uint_value (value, name, s -> mclt, MDL); | |
3281 | } else if (!omapi_ds_strcmp (name, "load-balance-max-secs")) { | |
3282 | return omapi_make_int_value (value, name, | |
3283 | s -> load_balance_max_secs, MDL); | |
3284 | } else if (!omapi_ds_strcmp (name, "load-balance-hba")) { | |
3285 | if (s -> hba) | |
3286 | return omapi_make_const_value (value, name, | |
3287 | s -> hba, 32, MDL); | |
3288 | return ISC_R_NOTFOUND; | |
3289 | } else if (!omapi_ds_strcmp (name, "partner-state")) { | |
3290 | return omapi_make_uint_value (value, name, | |
02ca1b45 | 3291 | s -> partner.state, MDL); |
85a53735 TL |
3292 | } else if (!omapi_ds_strcmp (name, "local-state")) { |
3293 | return omapi_make_uint_value (value, name, | |
02ca1b45 | 3294 | s -> me.state, MDL); |
85a53735 TL |
3295 | } else if (!omapi_ds_strcmp (name, "partner-stos")) { |
3296 | return omapi_make_int_value (value, name, | |
02ca1b45 | 3297 | s -> partner.stos, MDL); |
85a53735 TL |
3298 | } else if (!omapi_ds_strcmp (name, "local-stos")) { |
3299 | return omapi_make_int_value (value, name, | |
02ca1b45 | 3300 | s -> me.stos, MDL); |
85a53735 TL |
3301 | } else if (!omapi_ds_strcmp (name, "hierarchy")) { |
3302 | return omapi_make_uint_value (value, name, s -> i_am, MDL); | |
3303 | } else if (!omapi_ds_strcmp (name, "last-packet-sent")) { | |
3304 | return omapi_make_int_value (value, name, | |
3305 | s -> last_packet_sent, MDL); | |
3306 | } else if (!omapi_ds_strcmp (name, "last-timestamp-received")) { | |
3307 | return omapi_make_int_value (value, name, | |
3308 | s -> last_timestamp_received, | |
3309 | MDL); | |
3310 | } else if (!omapi_ds_strcmp (name, "skew")) { | |
3311 | return omapi_make_int_value (value, name, s -> skew, MDL); | |
85a53735 TL |
3312 | } else if (!omapi_ds_strcmp (name, "max-response-delay")) { |
3313 | return omapi_make_uint_value (value, name, | |
02ca1b45 TL |
3314 | s -> me.max_response_delay, |
3315 | MDL); | |
85a53735 TL |
3316 | } else if (!omapi_ds_strcmp (name, "cur-unacked-updates")) { |
3317 | return omapi_make_int_value (value, name, | |
3318 | s -> cur_unacked_updates, MDL); | |
3319 | } | |
6ec59010 | 3320 | |
d50d0b82 TL |
3321 | if (h -> inner && h -> inner -> type -> get_value) |
3322 | return (*(h -> inner -> type -> get_value)) | |
3323 | (h -> inner, id, name, value); | |
3324 | return ISC_R_NOTFOUND; | |
3325 | } | |
3326 | ||
3327 | isc_result_t dhcp_failover_state_destroy (omapi_object_t *h, | |
4bd8800e | 3328 | const char *file, int line) |
d50d0b82 | 3329 | { |
85a53735 TL |
3330 | dhcp_failover_state_t *s; |
3331 | ||
d50d0b82 | 3332 | if (h -> type != dhcp_type_failover_state) |
98bf1607 | 3333 | return DHCP_R_INVALIDARG; |
85a53735 | 3334 | s = (dhcp_failover_state_t *)h; |
d758ad8c | 3335 | |
85a53735 | 3336 | if (s -> link_to_peer) |
d758ad8c TL |
3337 | dhcp_failover_link_dereference (&s -> link_to_peer, file, line); |
3338 | if (s -> name) { | |
85a53735 | 3339 | dfree (s -> name, MDL); |
d758ad8c TL |
3340 | s -> name = (char *)0; |
3341 | } | |
02ca1b45 | 3342 | if (s -> partner.address) |
d758ad8c | 3343 | option_cache_dereference (&s -> partner.address, file, line); |
02ca1b45 | 3344 | if (s -> me.address) |
d758ad8c TL |
3345 | option_cache_dereference (&s -> me.address, file, line); |
3346 | if (s -> hba) { | |
3347 | dfree (s -> hba, file, line); | |
3348 | s -> hba = (u_int8_t *)0; | |
3349 | } | |
3350 | if (s -> update_queue_head) | |
3351 | lease_dereference (&s -> update_queue_head, file, line); | |
3352 | if (s -> update_queue_tail) | |
3353 | lease_dereference (&s -> update_queue_tail, file, line); | |
3354 | if (s -> ack_queue_head) | |
3355 | lease_dereference (&s -> ack_queue_head, file, line); | |
3356 | if (s -> ack_queue_tail) | |
3357 | lease_dereference (&s -> ack_queue_tail, file, line); | |
3358 | if (s -> send_update_done) | |
3359 | lease_dereference (&s -> send_update_done, file, line); | |
3360 | if (s -> toack_queue_head) | |
3361 | failover_message_dereference (&s -> toack_queue_head, | |
3362 | file, line); | |
3363 | if (s -> toack_queue_tail) | |
3364 | failover_message_dereference (&s -> toack_queue_tail, | |
3365 | file, line); | |
d50d0b82 TL |
3366 | return ISC_R_SUCCESS; |
3367 | } | |
3368 | ||
3369 | /* Write all the published values associated with the object through the | |
3370 | specified connection. */ | |
3371 | ||
3372 | isc_result_t dhcp_failover_state_stuff (omapi_object_t *c, | |
d8a417b2 | 3373 | omapi_object_t *id, |
85a53735 | 3374 | omapi_object_t *h) |
d50d0b82 | 3375 | { |
dd9237c3 TM |
3376 | /* In this function c should be a (omapi_connection_object_t *) */ |
3377 | ||
85a53735 | 3378 | dhcp_failover_state_t *s; |
85a53735 | 3379 | isc_result_t status; |
d50d0b82 | 3380 | |
85a53735 | 3381 | if (c -> type != omapi_type_connection) |
98bf1607 | 3382 | return DHCP_R_INVALIDARG; |
d50d0b82 | 3383 | |
85a53735 | 3384 | if (h -> type != dhcp_type_failover_state) |
98bf1607 | 3385 | return DHCP_R_INVALIDARG; |
85a53735 | 3386 | s = (dhcp_failover_state_t *)h; |
6ec59010 | 3387 | |
85a53735 TL |
3388 | status = omapi_connection_put_name (c, "name"); |
3389 | if (status != ISC_R_SUCCESS) | |
3390 | return status; | |
3391 | status = omapi_connection_put_string (c, s -> name); | |
3392 | if (status != ISC_R_SUCCESS) | |
3393 | return status; | |
3394 | ||
3395 | status = omapi_connection_put_name (c, "partner-address"); | |
3396 | if (status != ISC_R_SUCCESS) | |
3397 | return status; | |
02ca1b45 | 3398 | status = omapi_connection_put_uint32 (c, sizeof s -> partner.address); |
85a53735 TL |
3399 | if (status != ISC_R_SUCCESS) |
3400 | return status; | |
02ca1b45 TL |
3401 | status = omapi_connection_copyin (c, (u_int8_t *)&s -> partner.address, |
3402 | sizeof s -> partner.address); | |
85a53735 TL |
3403 | if (status != ISC_R_SUCCESS) |
3404 | return status; | |
6ec59010 | 3405 | |
85a53735 TL |
3406 | status = omapi_connection_put_name (c, "partner-port"); |
3407 | if (status != ISC_R_SUCCESS) | |
3408 | return status; | |
3409 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3410 | if (status != ISC_R_SUCCESS) | |
3411 | return status; | |
02ca1b45 | 3412 | status = omapi_connection_put_uint32 (c, (u_int32_t)s -> partner.port); |
85a53735 TL |
3413 | if (status != ISC_R_SUCCESS) |
3414 | return status; | |
6ec59010 | 3415 | |
85a53735 TL |
3416 | status = omapi_connection_put_name (c, "local-address"); |
3417 | if (status != ISC_R_SUCCESS) | |
3418 | return status; | |
02ca1b45 | 3419 | status = omapi_connection_put_uint32 (c, sizeof s -> me.address); |
85a53735 TL |
3420 | if (status != ISC_R_SUCCESS) |
3421 | return status; | |
02ca1b45 TL |
3422 | status = omapi_connection_copyin (c, (u_int8_t *)&s -> me.address, |
3423 | sizeof s -> me.address); | |
85a53735 TL |
3424 | if (status != ISC_R_SUCCESS) |
3425 | return status; | |
6ec59010 | 3426 | |
85a53735 TL |
3427 | status = omapi_connection_put_name (c, "local-port"); |
3428 | if (status != ISC_R_SUCCESS) | |
3429 | return status; | |
3430 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3431 | if (status != ISC_R_SUCCESS) | |
3432 | return status; | |
02ca1b45 | 3433 | status = omapi_connection_put_uint32 (c, (u_int32_t)s -> me.port); |
85a53735 TL |
3434 | if (status != ISC_R_SUCCESS) |
3435 | return status; | |
6ec59010 | 3436 | |
85a53735 TL |
3437 | status = omapi_connection_put_name (c, "max-outstanding-updates"); |
3438 | if (status != ISC_R_SUCCESS) | |
3439 | return status; | |
3440 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3441 | if (status != ISC_R_SUCCESS) | |
3442 | return status; | |
02ca1b45 TL |
3443 | status = omapi_connection_put_uint32 (c, |
3444 | s -> me.max_flying_updates); | |
85a53735 TL |
3445 | if (status != ISC_R_SUCCESS) |
3446 | return status; | |
3447 | ||
3448 | status = omapi_connection_put_name (c, "mclt"); | |
3449 | if (status != ISC_R_SUCCESS) | |
3450 | return status; | |
3451 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3452 | if (status != ISC_R_SUCCESS) | |
3453 | return status; | |
3454 | status = omapi_connection_put_uint32 (c, s -> mclt); | |
3455 | if (status != ISC_R_SUCCESS) | |
3456 | return status; | |
3457 | ||
3458 | status = omapi_connection_put_name (c, "load-balance-max-secs"); | |
3459 | if (status != ISC_R_SUCCESS) | |
3460 | return status; | |
3461 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3462 | if (status != ISC_R_SUCCESS) | |
3463 | return status; | |
3464 | status = (omapi_connection_put_uint32 | |
3465 | (c, (u_int32_t)s -> load_balance_max_secs)); | |
3466 | if (status != ISC_R_SUCCESS) | |
3467 | return status; | |
3468 | ||
6ec59010 | 3469 | |
85a53735 TL |
3470 | if (s -> hba) { |
3471 | status = omapi_connection_put_name (c, "load-balance-hba"); | |
3472 | if (status != ISC_R_SUCCESS) | |
3473 | return status; | |
3474 | status = omapi_connection_put_uint32 (c, 32); | |
3475 | if (status != ISC_R_SUCCESS) | |
3476 | return status; | |
3477 | status = omapi_connection_copyin (c, s -> hba, 32); | |
3478 | if (status != ISC_R_SUCCESS) | |
3479 | return status; | |
3480 | } | |
3481 | ||
3482 | status = omapi_connection_put_name (c, "partner-state"); | |
3483 | if (status != ISC_R_SUCCESS) | |
3484 | return status; | |
3485 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3486 | if (status != ISC_R_SUCCESS) | |
3487 | return status; | |
02ca1b45 | 3488 | status = omapi_connection_put_uint32 (c, s -> partner.state); |
85a53735 TL |
3489 | if (status != ISC_R_SUCCESS) |
3490 | return status; | |
6ec59010 | 3491 | |
85a53735 TL |
3492 | status = omapi_connection_put_name (c, "local-state"); |
3493 | if (status != ISC_R_SUCCESS) | |
3494 | return status; | |
3495 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3496 | if (status != ISC_R_SUCCESS) | |
3497 | return status; | |
02ca1b45 | 3498 | status = omapi_connection_put_uint32 (c, s -> me.state); |
85a53735 TL |
3499 | if (status != ISC_R_SUCCESS) |
3500 | return status; | |
6ec59010 | 3501 | |
85a53735 TL |
3502 | status = omapi_connection_put_name (c, "partner-stos"); |
3503 | if (status != ISC_R_SUCCESS) | |
3504 | return status; | |
3505 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3506 | if (status != ISC_R_SUCCESS) | |
3507 | return status; | |
02ca1b45 TL |
3508 | status = omapi_connection_put_uint32 (c, |
3509 | (u_int32_t)s -> partner.stos); | |
85a53735 TL |
3510 | if (status != ISC_R_SUCCESS) |
3511 | return status; | |
3512 | ||
3513 | status = omapi_connection_put_name (c, "local-stos"); | |
3514 | if (status != ISC_R_SUCCESS) | |
3515 | return status; | |
3516 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3517 | if (status != ISC_R_SUCCESS) | |
3518 | return status; | |
02ca1b45 | 3519 | status = omapi_connection_put_uint32 (c, (u_int32_t)s -> me.stos); |
85a53735 TL |
3520 | if (status != ISC_R_SUCCESS) |
3521 | return status; | |
3522 | ||
3523 | status = omapi_connection_put_name (c, "hierarchy"); | |
3524 | if (status != ISC_R_SUCCESS) | |
3525 | return status; | |
3526 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3527 | if (status != ISC_R_SUCCESS) | |
3528 | return status; | |
3529 | status = omapi_connection_put_uint32 (c, s -> i_am); | |
3530 | if (status != ISC_R_SUCCESS) | |
3531 | return status; | |
3532 | ||
3533 | status = omapi_connection_put_name (c, "last-packet-sent"); | |
3534 | if (status != ISC_R_SUCCESS) | |
3535 | return status; | |
3536 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3537 | if (status != ISC_R_SUCCESS) | |
3538 | return status; | |
3539 | status = (omapi_connection_put_uint32 | |
3540 | (c, (u_int32_t)s -> last_packet_sent)); | |
3541 | if (status != ISC_R_SUCCESS) | |
3542 | return status; | |
3543 | ||
3544 | status = omapi_connection_put_name (c, "last-timestamp-received"); | |
3545 | if (status != ISC_R_SUCCESS) | |
3546 | return status; | |
3547 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3548 | if (status != ISC_R_SUCCESS) | |
3549 | return status; | |
3550 | status = (omapi_connection_put_uint32 | |
3551 | (c, (u_int32_t)s -> last_timestamp_received)); | |
3552 | if (status != ISC_R_SUCCESS) | |
3553 | return status; | |
3554 | ||
3555 | status = omapi_connection_put_name (c, "skew"); | |
3556 | if (status != ISC_R_SUCCESS) | |
3557 | return status; | |
3558 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3559 | if (status != ISC_R_SUCCESS) | |
3560 | return status; | |
3561 | status = omapi_connection_put_uint32 (c, (u_int32_t)s -> skew); | |
3562 | if (status != ISC_R_SUCCESS) | |
3563 | return status; | |
3564 | ||
85a53735 TL |
3565 | status = omapi_connection_put_name (c, "max-response-delay"); |
3566 | if (status != ISC_R_SUCCESS) | |
3567 | return status; | |
3568 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3569 | if (status != ISC_R_SUCCESS) | |
3570 | return status; | |
3571 | status = (omapi_connection_put_uint32 | |
02ca1b45 | 3572 | (c, (u_int32_t)s -> me.max_response_delay)); |
85a53735 TL |
3573 | if (status != ISC_R_SUCCESS) |
3574 | return status; | |
6ec59010 | 3575 | |
85a53735 TL |
3576 | status = omapi_connection_put_name (c, "cur-unacked-updates"); |
3577 | if (status != ISC_R_SUCCESS) | |
3578 | return status; | |
3579 | status = omapi_connection_put_uint32 (c, sizeof (u_int32_t)); | |
3580 | if (status != ISC_R_SUCCESS) | |
3581 | return status; | |
3582 | status = (omapi_connection_put_uint32 | |
3583 | (c, (u_int32_t)s -> cur_unacked_updates)); | |
3584 | if (status != ISC_R_SUCCESS) | |
3585 | return status; | |
3586 | ||
3587 | if (h -> inner && h -> inner -> type -> stuff_values) | |
3588 | return (*(h -> inner -> type -> stuff_values)) (c, id, | |
3589 | h -> inner); | |
d50d0b82 TL |
3590 | return ISC_R_SUCCESS; |
3591 | } | |
3592 | ||
d8a417b2 TL |
3593 | isc_result_t dhcp_failover_state_lookup (omapi_object_t **sp, |
3594 | omapi_object_t *id, | |
3595 | omapi_object_t *ref) | |
3596 | { | |
3597 | omapi_value_t *tv = (omapi_value_t *)0; | |
3598 | isc_result_t status; | |
3599 | dhcp_failover_state_t *s; | |
3600 | ||
d758ad8c | 3601 | if (!ref) |
98bf1607 | 3602 | return DHCP_R_NOKEYS; |
d758ad8c | 3603 | |
d8a417b2 TL |
3604 | /* First see if we were sent a handle. */ |
3605 | status = omapi_get_value_str (ref, id, "handle", &tv); | |
3606 | if (status == ISC_R_SUCCESS) { | |
3607 | status = omapi_handle_td_lookup (sp, tv -> value); | |
3608 | ||
4bd8800e | 3609 | omapi_value_dereference (&tv, MDL); |
d8a417b2 TL |
3610 | if (status != ISC_R_SUCCESS) |
3611 | return status; | |
3612 | ||
3613 | /* Don't return the object if the type is wrong. */ | |
3614 | if ((*sp) -> type != dhcp_type_failover_state) { | |
4bd8800e | 3615 | omapi_object_dereference (sp, MDL); |
98bf1607 | 3616 | return DHCP_R_INVALIDARG; |
d8a417b2 TL |
3617 | } |
3618 | } | |
3619 | ||
dd53dc5a | 3620 | /* Look the failover state up by peer name. */ |
01c6e68a | 3621 | status = omapi_get_value_str (ref, id, "name", &tv); |
d8a417b2 TL |
3622 | if (status == ISC_R_SUCCESS) { |
3623 | for (s = failover_states; s; s = s -> next) { | |
dd53dc5a | 3624 | unsigned l = strlen (s -> name); |
98311e4b | 3625 | if (l == tv -> value -> u.buffer.len && |
dd53dc5a | 3626 | !memcmp (s -> name, |
d8a417b2 TL |
3627 | tv -> value -> u.buffer.value, l)) |
3628 | break; | |
3629 | } | |
4bd8800e | 3630 | omapi_value_dereference (&tv, MDL); |
d8a417b2 TL |
3631 | |
3632 | /* If we already have a lease, and it's not the same one, | |
3633 | then the query was invalid. */ | |
3634 | if (*sp && *sp != (omapi_object_t *)s) { | |
4bd8800e | 3635 | omapi_object_dereference (sp, MDL); |
98bf1607 | 3636 | return DHCP_R_KEYCONFLICT; |
d8a417b2 TL |
3637 | } else if (!s) { |
3638 | if (*sp) | |
4bd8800e | 3639 | omapi_object_dereference (sp, MDL); |
d8a417b2 TL |
3640 | return ISC_R_NOTFOUND; |
3641 | } else if (!*sp) | |
3642 | /* XXX fix so that hash lookup itself creates | |
3643 | XXX the reference. */ | |
4bd8800e | 3644 | omapi_object_reference (sp, (omapi_object_t *)s, MDL); |
d8a417b2 TL |
3645 | } |
3646 | ||
3647 | /* If we get to here without finding a lease, no valid key was | |
3648 | specified. */ | |
3649 | if (!*sp) | |
98bf1607 | 3650 | return DHCP_R_NOKEYS; |
d8a417b2 TL |
3651 | return ISC_R_SUCCESS; |
3652 | } | |
3653 | ||
3654 | isc_result_t dhcp_failover_state_create (omapi_object_t **sp, | |
3655 | omapi_object_t *id) | |
3656 | { | |
3657 | return ISC_R_NOTIMPLEMENTED; | |
3658 | } | |
3659 | ||
3660 | isc_result_t dhcp_failover_state_remove (omapi_object_t *sp, | |
3661 | omapi_object_t *id) | |
3662 | { | |
3663 | return ISC_R_NOTIMPLEMENTED; | |
3664 | } | |
3665 | ||
9f3da356 TL |
3666 | int dhcp_failover_state_match (dhcp_failover_state_t *state, |
3667 | u_int8_t *addr, unsigned addrlen) | |
3668 | { | |
9f3da356 TL |
3669 | struct data_string ds; |
3670 | int i; | |
6ec59010 | 3671 | |
9f3da356 TL |
3672 | memset (&ds, 0, sizeof ds); |
3673 | if (evaluate_option_cache (&ds, (struct packet *)0, | |
3674 | (struct lease *)0, | |
9e383163 | 3675 | (struct client_state *)0, |
9f3da356 TL |
3676 | (struct option_state *)0, |
3677 | (struct option_state *)0, | |
3678 | &global_scope, | |
02ca1b45 | 3679 | state -> partner.address, MDL)) { |
9f3da356 TL |
3680 | for (i = 0; i + addrlen - 1 < ds.len; i += addrlen) { |
3681 | if (!memcmp (&ds.data [i], | |
3682 | addr, addrlen)) { | |
3683 | data_string_forget (&ds, MDL); | |
3684 | return 1; | |
3685 | } | |
3686 | } | |
3687 | data_string_forget (&ds, MDL); | |
3688 | } | |
3689 | return 0; | |
3690 | } | |
3691 | ||
a55ccdd0 DH |
3692 | int |
3693 | dhcp_failover_state_match_by_name(state, name) | |
3694 | dhcp_failover_state_t *state; | |
3695 | failover_option_t *name; | |
3696 | { | |
3697 | if ((strlen(state->name) == name->count) && | |
3698 | (memcmp(state->name, name->data, name->count) == 0)) | |
3699 | return 1; | |
3700 | ||
3701 | return 0; | |
3702 | } | |
3703 | ||
9f3da356 TL |
3704 | const char *dhcp_failover_reject_reason_print (int reason) |
3705 | { | |
a55ccdd0 DH |
3706 | static char resbuf[sizeof("Undefined-255: This reason code is not defined " |
3707 | "in the protocol standard.")]; | |
3708 | ||
3709 | if ((reason > 0xff) || (reason < 0)) | |
3710 | return "Reason code out of range."; | |
3711 | ||
9f3da356 TL |
3712 | switch (reason) { |
3713 | case FTR_ILLEGAL_IP_ADDR: | |
3714 | return "Illegal IP address (not part of any address pool)."; | |
3715 | ||
3716 | case FTR_FATAL_CONFLICT: | |
3717 | return "Fatal conflict exists: address in use by other client."; | |
3718 | ||
3719 | case FTR_MISSING_BINDINFO: | |
3720 | return "Missing binding information."; | |
3721 | ||
3722 | case FTR_TIMEMISMATCH: | |
3723 | return "Connection rejected, time mismatch too great."; | |
3724 | ||
3725 | case FTR_INVALID_MCLT: | |
3726 | return "Connection rejected, invalid MCLT."; | |
3727 | ||
3728 | case FTR_MISC_REJECT: | |
3729 | return "Connection rejected, unknown reason."; | |
3730 | ||
3731 | case FTR_DUP_CONNECTION: | |
3732 | return "Connection rejected, duplicate connection."; | |
3733 | ||
3734 | case FTR_INVALID_PARTNER: | |
3735 | return "Connection rejected, invalid failover partner."; | |
3736 | ||
3737 | case FTR_TLS_UNSUPPORTED: | |
3738 | return "TLS not supported."; | |
3739 | ||
3740 | case FTR_TLS_UNCONFIGURED: | |
3741 | return "TLS supported but not configured."; | |
3742 | ||
3743 | case FTR_TLS_REQUIRED: | |
3744 | return "TLS required but not supported by partner."; | |
3745 | ||
3746 | case FTR_DIGEST_UNSUPPORTED: | |
3747 | return "Message digest not supported."; | |
3748 | ||
3749 | case FTR_DIGEST_UNCONFIGURED: | |
3750 | return "Message digest not configured."; | |
3751 | ||
3752 | case FTR_VERSION_MISMATCH: | |
3753 | return "Protocol version mismatch."; | |
3754 | ||
9f3da356 TL |
3755 | case FTR_OUTDATED_BIND_INFO: |
3756 | return "Outdated binding information."; | |
3757 | ||
3758 | case FTR_LESS_CRIT_BIND_INFO: | |
3759 | return "Less critical binding information."; | |
3760 | ||
3761 | case FTR_NO_TRAFFIC: | |
3762 | return "No traffic within sufficient time."; | |
3763 | ||
3764 | case FTR_HBA_CONFLICT: | |
3765 | return "Hash bucket assignment conflict."; | |
3766 | ||
a55ccdd0 DH |
3767 | case FTR_IP_NOT_RESERVED: |
3768 | return "IP not reserved on this server."; | |
3769 | ||
3770 | case FTR_IP_DIGEST_FAILURE: | |
3771 | return "Message digest failed to compare."; | |
3772 | ||
3773 | case FTR_IP_MISSING_DIGEST: | |
3774 | return "Missing message digest."; | |
3775 | ||
9f3da356 | 3776 | case FTR_UNKNOWN: |
a55ccdd0 DH |
3777 | return "Unknown Error."; |
3778 | ||
3779 | default: | |
3780 | sprintf(resbuf, "Undefined-%d: This reason code is not defined in the " | |
3781 | "protocol standard.", reason); | |
3782 | return resbuf; | |
9f3da356 TL |
3783 | } |
3784 | } | |
3785 | ||
3786 | const char *dhcp_failover_state_name_print (enum failover_state state) | |
3787 | { | |
3788 | switch (state) { | |
3789 | default: | |
3790 | case unknown_state: | |
3791 | return "unknown-state"; | |
3792 | ||
3793 | case partner_down: | |
3794 | return "partner-down"; | |
3795 | ||
3796 | case normal: | |
3797 | return "normal"; | |
3798 | ||
99363a74 DH |
3799 | case conflict_done: |
3800 | return "conflict-done"; | |
3801 | ||
9f3da356 TL |
3802 | case communications_interrupted: |
3803 | return "communications-interrupted"; | |
3804 | ||
5f0c7be1 TL |
3805 | case resolution_interrupted: |
3806 | return "resolution-interrupted"; | |
9f3da356 TL |
3807 | |
3808 | case potential_conflict: | |
3809 | return "potential-conflict"; | |
3810 | ||
3811 | case recover: | |
3812 | return "recover"; | |
02ca1b45 TL |
3813 | |
3814 | case recover_done: | |
3815 | return "recover-done"; | |
3816 | ||
fd273e02 TL |
3817 | case recover_wait: |
3818 | return "recover-wait"; | |
3819 | ||
02ca1b45 TL |
3820 | case shut_down: |
3821 | return "shutdown"; | |
3822 | ||
3823 | case paused: | |
3824 | return "paused"; | |
3825 | ||
3826 | case startup: | |
3827 | return "startup"; | |
3828 | } | |
3829 | } | |
3830 | ||
d9539882 | 3831 | const char *dhcp_failover_message_name (unsigned type) |
02ca1b45 | 3832 | { |
a55ccdd0 DH |
3833 | static char messbuf[sizeof("unknown-message-255")]; |
3834 | ||
3835 | if (type > 0xff) | |
3836 | return "invalid-message"; | |
3837 | ||
02ca1b45 TL |
3838 | switch (type) { |
3839 | case FTM_POOLREQ: | |
3840 | return "pool-request"; | |
6ec59010 | 3841 | |
02ca1b45 TL |
3842 | case FTM_POOLRESP: |
3843 | return "pool-response"; | |
3844 | ||
3845 | case FTM_BNDUPD: | |
3846 | return "bind-update"; | |
3847 | ||
3848 | case FTM_BNDACK: | |
3849 | return "bind-ack"; | |
3850 | ||
3851 | case FTM_CONNECT: | |
3852 | return "connect"; | |
3853 | ||
3854 | case FTM_CONNECTACK: | |
3855 | return "connect-ack"; | |
3856 | ||
3857 | case FTM_UPDREQ: | |
3858 | return "update-request"; | |
3859 | ||
3860 | case FTM_UPDDONE: | |
3861 | return "update-done"; | |
3862 | ||
3863 | case FTM_UPDREQALL: | |
3864 | return "update-request-all"; | |
3865 | ||
3866 | case FTM_STATE: | |
3867 | return "state"; | |
3868 | ||
3869 | case FTM_CONTACT: | |
3870 | return "contact"; | |
3871 | ||
3872 | case FTM_DISCONNECT: | |
3873 | return "disconnect"; | |
3874 | ||
3875 | default: | |
a55ccdd0 DH |
3876 | sprintf(messbuf, "unknown-message-%u", type); |
3877 | return messbuf; | |
02ca1b45 TL |
3878 | } |
3879 | } | |
3880 | ||
12fd6075 TL |
3881 | const char *dhcp_failover_option_name (unsigned type) |
3882 | { | |
a55ccdd0 DH |
3883 | static char optbuf[sizeof("unknown-option-65535")]; |
3884 | ||
3885 | if (type > 0xffff) | |
3886 | return "invalid-option"; | |
3887 | ||
02ca1b45 | 3888 | switch (type) { |
a55ccdd0 DH |
3889 | case FTO_ADDRESSES_TRANSFERRED: |
3890 | return "addresses-transferred"; | |
02ca1b45 | 3891 | |
a55ccdd0 | 3892 | case FTO_ASSIGNED_IP_ADDRESS: |
02ca1b45 TL |
3893 | return "assigned-ip-address"; |
3894 | ||
a55ccdd0 DH |
3895 | case FTO_BINDING_STATUS: |
3896 | return "binding-status"; | |
02ca1b45 | 3897 | |
a55ccdd0 | 3898 | case FTO_CLIENT_IDENTIFIER: |
02ca1b45 TL |
3899 | return "client-identifier"; |
3900 | ||
a55ccdd0 | 3901 | case FTO_CHADDR: |
02ca1b45 TL |
3902 | return "chaddr"; |
3903 | ||
a55ccdd0 DH |
3904 | case FTO_CLTT: |
3905 | return "cltt"; | |
02ca1b45 | 3906 | |
a55ccdd0 DH |
3907 | case FTO_DDNS: |
3908 | return "ddns"; | |
02ca1b45 | 3909 | |
a55ccdd0 DH |
3910 | case FTO_DELAYED_SERVICE: |
3911 | return "delayed-service"; | |
02ca1b45 | 3912 | |
a55ccdd0 DH |
3913 | case FTO_HBA: |
3914 | return "hba"; | |
02ca1b45 | 3915 | |
a55ccdd0 DH |
3916 | case FTO_IP_FLAGS: |
3917 | return "ip-flags"; | |
02ca1b45 | 3918 | |
a55ccdd0 | 3919 | case FTO_LEASE_EXPIRY: |
02ca1b45 TL |
3920 | return "lease-expiry"; |
3921 | ||
a55ccdd0 DH |
3922 | case FTO_MAX_UNACKED: |
3923 | return "max-unacked"; | |
02ca1b45 | 3924 | |
a55ccdd0 DH |
3925 | case FTO_MCLT: |
3926 | return "mclt"; | |
02ca1b45 | 3927 | |
a55ccdd0 DH |
3928 | case FTO_MESSAGE: |
3929 | return "message"; | |
02ca1b45 | 3930 | |
a55ccdd0 DH |
3931 | case FTO_MESSAGE_DIGEST: |
3932 | return "message-digest"; | |
02ca1b45 | 3933 | |
a55ccdd0 DH |
3934 | case FTO_POTENTIAL_EXPIRY: |
3935 | return "potential-expiry"; | |
02ca1b45 | 3936 | |
a55ccdd0 DH |
3937 | case FTO_PROTOCOL_VERSION: |
3938 | return "protocol-version"; | |
02ca1b45 | 3939 | |
a55ccdd0 DH |
3940 | case FTO_RECEIVE_TIMER: |
3941 | return "receive-timer"; | |
02ca1b45 | 3942 | |
a55ccdd0 DH |
3943 | case FTO_REJECT_REASON: |
3944 | return "reject-reason"; | |
02ca1b45 | 3945 | |
a55ccdd0 DH |
3946 | case FTO_RELATIONSHIP_NAME: |
3947 | return "relationship-name"; | |
02ca1b45 | 3948 | |
a55ccdd0 DH |
3949 | case FTO_REPLY_OPTIONS: |
3950 | return "reply-options"; | |
02ca1b45 | 3951 | |
a55ccdd0 DH |
3952 | case FTO_REQUEST_OPTIONS: |
3953 | return "request-options"; | |
02ca1b45 | 3954 | |
a55ccdd0 DH |
3955 | case FTO_SERVER_FLAGS: |
3956 | return "server-flags"; | |
02ca1b45 | 3957 | |
a55ccdd0 DH |
3958 | case FTO_SERVER_STATE: |
3959 | return "server-state"; | |
3960 | ||
3961 | case FTO_STOS: | |
3962 | return "stos"; | |
02ca1b45 | 3963 | |
a55ccdd0 | 3964 | case FTO_TLS_REPLY: |
02ca1b45 TL |
3965 | return "tls-reply"; |
3966 | ||
a55ccdd0 DH |
3967 | case FTO_TLS_REQUEST: |
3968 | return "tls-request"; | |
02ca1b45 | 3969 | |
a55ccdd0 DH |
3970 | case FTO_VENDOR_CLASS: |
3971 | return "vendor-class"; | |
02ca1b45 | 3972 | |
a55ccdd0 DH |
3973 | case FTO_VENDOR_OPTIONS: |
3974 | return "vendor-options"; | |
3975 | ||
3976 | default: | |
3977 | sprintf(optbuf, "unknown-option-%u", type); | |
3978 | return optbuf; | |
9f3da356 TL |
3979 | } |
3980 | } | |
3981 | ||
8c8e27c5 TL |
3982 | failover_option_t *dhcp_failover_option_printf (unsigned code, |
3983 | char *obuf, | |
3984 | unsigned *obufix, | |
3985 | unsigned obufmax, | |
007e3ee4 TL |
3986 | const char *fmt, ...) |
3987 | { | |
8c8e27c5 TL |
3988 | va_list va; |
3989 | char tbuf [256]; | |
3990 | ||
98311e4b DH |
3991 | /* %Audit% Truncation causes panic. %2004.06.17,Revisit% |
3992 | * It is unclear what the effects of truncation here are, or | |
3993 | * how that condition should be handled. It seems that this | |
3994 | * function is used for formatting messages in the failover | |
3995 | * command channel. For now the safest thing is for | |
3996 | * overflow-truncation to cause a fatal log. | |
3997 | */ | |
8c8e27c5 | 3998 | va_start (va, fmt); |
98311e4b DH |
3999 | if (vsnprintf (tbuf, sizeof tbuf, fmt, va) >= sizeof tbuf) |
4000 | log_fatal ("%s: vsnprintf would truncate", | |
4001 | "dhcp_failover_make_option"); | |
8c8e27c5 TL |
4002 | va_end (va); |
4003 | ||
4004 | return dhcp_failover_make_option (code, obuf, obufix, obufmax, | |
4005 | strlen (tbuf), tbuf); | |
4006 | } | |
4007 | ||
d8a417b2 TL |
4008 | failover_option_t *dhcp_failover_make_option (unsigned code, |
4009 | char *obuf, unsigned *obufix, | |
4010 | unsigned obufmax, ...) | |
4011 | { | |
4012 | va_list va; | |
4013 | struct failover_option_info *info; | |
4014 | int i; | |
4015 | unsigned size, count; | |
4016 | unsigned val; | |
85a53735 | 4017 | u_int8_t *iaddr; |
98311e4b | 4018 | unsigned ilen = 0; |
d8a417b2 | 4019 | u_int8_t *bval; |
98311e4b | 4020 | char *txt = NULL; |
d8a417b2 TL |
4021 | #if defined (DEBUG_FAILOVER_MESSAGES) |
4022 | char tbuf [256]; | |
4023 | #endif | |
8c8e27c5 | 4024 | |
d8a417b2 TL |
4025 | /* Note that the failover_option structure is used differently on |
4026 | input than on output - on input, count is an element count, and | |
4027 | on output it's the number of bytes total in the option, including | |
4028 | the option code and option length. */ | |
4029 | failover_option_t option, *op; | |
4030 | ||
4031 | ||
4032 | /* Bogus option code? */ | |
4033 | if (code < 1 || code > FTO_MAX || ft_options [code].type == FT_UNDEF) { | |
4034 | return &null_failover_option; | |
4035 | } | |
4036 | info = &ft_options [code]; | |
6ec59010 | 4037 | |
d8a417b2 TL |
4038 | va_start (va, obufmax); |
4039 | ||
4040 | /* Get the number of elements and the size of the buffer we need | |
4041 | to allocate. */ | |
4042 | if (info -> type == FT_DDNS || info -> type == FT_DDNS1) { | |
4043 | count = info -> type == FT_DDNS ? 1 : 2; | |
4044 | size = va_arg (va, int) + count; | |
4045 | } else { | |
4046 | /* Find out how many items in this list. */ | |
4047 | if (info -> num_present) | |
4048 | count = info -> num_present; | |
4049 | else | |
4050 | count = va_arg (va, int); | |
4051 | ||
4052 | /* Figure out size. */ | |
4053 | switch (info -> type) { | |
4054 | case FT_UINT8: | |
4055 | case FT_BYTES: | |
4056 | case FT_DIGEST: | |
4057 | size = count; | |
4058 | break; | |
4059 | ||
4060 | case FT_TEXT_OR_BYTES: | |
4061 | case FT_TEXT: | |
8c8e27c5 TL |
4062 | txt = va_arg (va, char *); |
4063 | size = count; | |
d8a417b2 TL |
4064 | break; |
4065 | ||
4066 | case FT_IPADDR: | |
9f3da356 TL |
4067 | ilen = va_arg (va, unsigned); |
4068 | size = count * ilen; | |
8c8e27c5 | 4069 | break; |
9f3da356 | 4070 | |
d8a417b2 TL |
4071 | case FT_UINT32: |
4072 | size = count * 4; | |
4073 | break; | |
4074 | ||
4075 | case FT_UINT16: | |
4076 | size = count * 2; | |
4077 | break; | |
4078 | ||
4079 | default: | |
4080 | /* shouldn't get here. */ | |
4081 | log_fatal ("bogus type in failover_make_option: %d", | |
4082 | info -> type); | |
98311e4b | 4083 | return &null_failover_option; |
d8a417b2 TL |
4084 | } |
4085 | } | |
6ec59010 | 4086 | |
d8a417b2 TL |
4087 | size += 4; |
4088 | ||
4089 | /* Allocate a buffer for the option. */ | |
4090 | option.count = size; | |
4bd8800e | 4091 | option.data = dmalloc (option.count, MDL); |
98311e4b DH |
4092 | if (!option.data) { |
4093 | va_end (va); | |
d8a417b2 | 4094 | return &null_failover_option; |
98311e4b | 4095 | } |
d8a417b2 TL |
4096 | |
4097 | /* Put in the option code and option length. */ | |
4098 | putUShort (option.data, code); | |
9f3da356 | 4099 | putUShort (&option.data [2], size - 4); |
d8a417b2 | 4100 | |
6ec59010 | 4101 | #if defined (DEBUG_FAILOVER_MESSAGES) |
98311e4b DH |
4102 | /* %Audit% Truncation causes panic. %2004.06.17,Revisit% |
4103 | * It is unclear what the effects of truncation here are, or | |
4104 | * how that condition should be handled. It seems that this | |
4105 | * message may be sent over the failover command channel. | |
4106 | * For now the safest thing is for overflow-truncation to cause | |
4107 | * a fatal log. | |
4108 | */ | |
4109 | if (snprintf (tbuf, sizeof tbuf, " (%s<%d>", info -> name, | |
4110 | option.count) >= sizeof tbuf) | |
4111 | log_fatal ("dhcp_failover_make_option: tbuf overflow"); | |
d8a417b2 TL |
4112 | failover_print (obuf, obufix, obufmax, tbuf); |
4113 | #endif | |
4114 | ||
4115 | /* Now put in the data. */ | |
4116 | switch (info -> type) { | |
4117 | case FT_UINT8: | |
4118 | for (i = 0; i < count; i++) { | |
4119 | val = va_arg (va, unsigned); | |
4120 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
98311e4b | 4121 | /* %Audit% Cannot exceed 24 bytes. %2004.06.17,Safe% */ |
d8a417b2 TL |
4122 | sprintf (tbuf, " %d", val); |
4123 | failover_print (obuf, obufix, obufmax, tbuf); | |
4124 | #endif | |
4125 | option.data [i + 4] = val; | |
4126 | } | |
4127 | break; | |
4128 | ||
4129 | case FT_IPADDR: | |
4130 | for (i = 0; i < count; i++) { | |
85a53735 TL |
4131 | iaddr = va_arg (va, u_int8_t *); |
4132 | if (ilen != 4) { | |
4bd8800e | 4133 | dfree (option.data, MDL); |
d8a417b2 | 4134 | log_error ("IP addrlen=%d, should be 4.", |
85a53735 | 4135 | ilen); |
98311e4b | 4136 | va_end (va); |
d8a417b2 TL |
4137 | return &null_failover_option; |
4138 | } | |
6ec59010 | 4139 | |
d8a417b2 | 4140 | #if defined (DEBUG_FAILOVER_MESSAGES) |
98311e4b DH |
4141 | /*%Audit% Cannot exceed 17 bytes. %2004.06.17,Safe%*/ |
4142 | sprintf (tbuf, " %u.%u.%u.%u", | |
4143 | iaddr [0], iaddr [1], iaddr [2], iaddr [3]); | |
d8a417b2 TL |
4144 | failover_print (obuf, obufix, obufmax, tbuf); |
4145 | #endif | |
9f3da356 | 4146 | memcpy (&option.data [4 + i * ilen], iaddr, ilen); |
d8a417b2 TL |
4147 | } |
4148 | break; | |
4149 | ||
4150 | case FT_UINT32: | |
4151 | for (i = 0; i < count; i++) { | |
4152 | val = va_arg (va, unsigned); | |
4153 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
98311e4b | 4154 | /*%Audit% Cannot exceed 24 bytes. %2004.06.17,Safe%*/ |
d8a417b2 TL |
4155 | sprintf (tbuf, " %d", val); |
4156 | failover_print (obuf, obufix, obufmax, tbuf); | |
4157 | #endif | |
4158 | putULong (&option.data [4 + i * 4], val); | |
4159 | } | |
4160 | break; | |
4161 | ||
4162 | case FT_BYTES: | |
4163 | case FT_DIGEST: | |
4164 | bval = va_arg (va, u_int8_t *); | |
4165 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4166 | for (i = 0; i < count; i++) { | |
98311e4b | 4167 | /* 23 bytes plus nul, safe. */ |
d8a417b2 TL |
4168 | sprintf (tbuf, " %d", bval [i]); |
4169 | failover_print (obuf, obufix, obufmax, tbuf); | |
4170 | } | |
4171 | #endif | |
4172 | memcpy (&option.data [4], bval, count); | |
4173 | break; | |
4174 | ||
4175 | /* On output, TEXT_OR_BYTES is _always_ text, and always NUL | |
98311e4b DH |
4176 | terminated. Note that the caller should be careful not |
4177 | to provide a format and data that amount to more than 256 | |
4178 | bytes of data, since it will cause a fatal error. */ | |
d8a417b2 TL |
4179 | case FT_TEXT_OR_BYTES: |
4180 | case FT_TEXT: | |
4181 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
98311e4b DH |
4182 | /* %Audit% Truncation causes panic. %2004.06.17,Revisit% |
4183 | * It is unclear what the effects of truncation here are, or | |
4184 | * how that condition should be handled. It seems that this | |
4185 | * function is used for formatting messages in the failover | |
4186 | * command channel. For now the safest thing is for | |
4187 | * overflow-truncation to cause a fatal log. | |
4188 | */ | |
4189 | if (snprintf (tbuf, sizeof tbuf, "\"%s\"", txt) >= sizeof tbuf) | |
4190 | log_fatal ("dhcp_failover_make_option: tbuf overflow"); | |
d8a417b2 | 4191 | failover_print (obuf, obufix, obufmax, tbuf); |
d8a417b2 | 4192 | #endif |
8c8e27c5 | 4193 | memcpy (&option.data [4], txt, count); |
d8a417b2 TL |
4194 | break; |
4195 | ||
4196 | case FT_DDNS: | |
4197 | case FT_DDNS1: | |
4198 | option.data [4] = va_arg (va, unsigned); | |
4199 | if (count == 2) | |
4200 | option.data [5] = va_arg (va, unsigned); | |
4201 | bval = va_arg (va, u_int8_t *); | |
4202 | memcpy (&option.data [4 + count], bval, size - count - 4); | |
4203 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4204 | for (i = 4; i < size; i++) { | |
98311e4b | 4205 | /*%Audit% Cannot exceed 24 bytes. %2004.06.17,Safe%*/ |
d8a417b2 TL |
4206 | sprintf (tbuf, " %d", option.data [i]); |
4207 | failover_print (obuf, obufix, obufmax, tbuf); | |
4208 | } | |
4209 | #endif | |
4210 | break; | |
4211 | ||
4212 | case FT_UINT16: | |
4213 | for (i = 0; i < count; i++) { | |
4214 | val = va_arg (va, u_int32_t); | |
4215 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
98311e4b | 4216 | /*%Audit% Cannot exceed 24 bytes. %2004.06.17,Safe%*/ |
d8a417b2 TL |
4217 | sprintf (tbuf, " %d", val); |
4218 | failover_print (obuf, obufix, obufmax, tbuf); | |
4219 | #endif | |
4220 | putUShort (&option.data [4 + i * 2], val); | |
4221 | } | |
4222 | break; | |
4223 | ||
4224 | case FT_UNDEF: | |
4225 | default: | |
165bce70 | 4226 | break; |
d8a417b2 TL |
4227 | } |
4228 | ||
0096c639 | 4229 | #if defined DEBUG_FAILOVER_MESSAGES |
d8a417b2 | 4230 | failover_print (obuf, obufix, obufmax, ")"); |
0096c639 | 4231 | #endif |
98311e4b | 4232 | va_end (va); |
d8a417b2 TL |
4233 | |
4234 | /* Now allocate a place to store what we just set up. */ | |
4bd8800e | 4235 | op = dmalloc (sizeof (failover_option_t), MDL); |
d8a417b2 | 4236 | if (!op) { |
4bd8800e | 4237 | dfree (option.data, MDL); |
d8a417b2 TL |
4238 | return &null_failover_option; |
4239 | } | |
4240 | ||
4241 | *op = option; | |
4242 | return op; | |
4243 | } | |
4244 | ||
4245 | /* Send a failover message header. */ | |
4246 | ||
4247 | isc_result_t dhcp_failover_put_message (dhcp_failover_link_t *link, | |
4248 | omapi_object_t *connection, | |
a55ccdd0 | 4249 | int msg_type, u_int32_t xid, ...) |
d8a417b2 | 4250 | { |
d8a417b2 TL |
4251 | unsigned size = 0; |
4252 | int bad_option = 0; | |
4253 | int opix = 0; | |
4254 | va_list list; | |
4255 | failover_option_t *option; | |
4256 | unsigned char *opbuf; | |
4257 | isc_result_t status = ISC_R_SUCCESS; | |
4258 | unsigned char cbuf; | |
be62cf06 | 4259 | struct timeval tv; |
d8a417b2 TL |
4260 | |
4261 | /* Run through the argument list once to compute the length of | |
4262 | the option portion of the message. */ | |
a55ccdd0 | 4263 | va_start (list, xid); |
d8a417b2 | 4264 | while ((option = va_arg (list, failover_option_t *))) { |
dd53dc5a TL |
4265 | if (option != &skip_failover_option) |
4266 | size += option -> count; | |
d8a417b2 TL |
4267 | if (option == &null_failover_option) |
4268 | bad_option = 1; | |
4269 | } | |
4270 | va_end (list); | |
4271 | ||
4272 | /* Allocate an option buffer, unless we got an error. */ | |
61aaca12 | 4273 | if (!bad_option && size) { |
4bd8800e | 4274 | opbuf = dmalloc (size, MDL); |
d8a417b2 TL |
4275 | if (!opbuf) |
4276 | status = ISC_R_NOMEMORY; | |
61aaca12 TL |
4277 | } else |
4278 | opbuf = (unsigned char *)0; | |
d8a417b2 | 4279 | |
a55ccdd0 | 4280 | va_start (list, xid); |
d8a417b2 | 4281 | while ((option = va_arg (list, failover_option_t *))) { |
dd53dc5a TL |
4282 | if (option == &skip_failover_option) |
4283 | continue; | |
d8a417b2 TL |
4284 | if (!bad_option && opbuf) |
4285 | memcpy (&opbuf [opix], | |
4286 | option -> data, option -> count); | |
85a53735 TL |
4287 | if (option != &null_failover_option && |
4288 | option != &skip_failover_option) { | |
4289 | opix += option -> count; | |
4290 | dfree (option -> data, MDL); | |
4291 | dfree (option, MDL); | |
4292 | } | |
d8a417b2 | 4293 | } |
a55ccdd0 | 4294 | va_end(list); |
d8a417b2 | 4295 | |
9f3da356 | 4296 | if (bad_option) |
98bf1607 | 4297 | return DHCP_R_INVALIDARG; |
d8a417b2 TL |
4298 | |
4299 | /* Now send the message header. */ | |
4300 | ||
4301 | /* Message length. */ | |
4302 | status = omapi_connection_put_uint16 (connection, size + 12); | |
4303 | if (status != ISC_R_SUCCESS) | |
4304 | goto err; | |
4305 | ||
4306 | /* Message type. */ | |
4307 | cbuf = msg_type; | |
4308 | status = omapi_connection_copyin (connection, &cbuf, 1); | |
4309 | if (status != ISC_R_SUCCESS) | |
4310 | goto err; | |
4311 | ||
4312 | /* Payload offset. */ | |
4313 | cbuf = 12; | |
4314 | status = omapi_connection_copyin (connection, &cbuf, 1); | |
4315 | if (status != ISC_R_SUCCESS) | |
4316 | goto err; | |
4317 | ||
4318 | /* Current time. */ | |
4319 | status = omapi_connection_put_uint32 (connection, (u_int32_t)cur_time); | |
4320 | if (status != ISC_R_SUCCESS) | |
4321 | goto err; | |
4322 | ||
4323 | /* Transaction ID. */ | |
a55ccdd0 | 4324 | status = omapi_connection_put_uint32(connection, xid); |
d8a417b2 TL |
4325 | if (status != ISC_R_SUCCESS) |
4326 | goto err; | |
4327 | ||
d8a417b2 | 4328 | /* Payload. */ |
61aaca12 TL |
4329 | if (opbuf) { |
4330 | status = omapi_connection_copyin (connection, opbuf, size); | |
4331 | if (status != ISC_R_SUCCESS) | |
4332 | goto err; | |
4333 | dfree (opbuf, MDL); | |
4334 | } | |
6f0b9ed0 | 4335 | if (link -> state_object && |
da292833 | 4336 | link -> state_object -> link_to_peer == link) { |
1387545f | 4337 | #if defined (DEBUG_FAILOVER_CONTACT_TIMING) |
0db87765 TL |
4338 | log_info ("add_timeout +%d %s", |
4339 | (int)(link -> state_object -> | |
4340 | partner.max_response_delay) / 3, | |
4341 | "dhcp_failover_send_contact"); | |
4342 | #endif | |
be62cf06 FD |
4343 | tv . tv_sec = cur_time + |
4344 | (int)(link -> state_object -> | |
4345 | partner.max_response_delay) / 3; | |
4346 | tv . tv_usec = 0; | |
4347 | add_timeout (&tv, | |
6f0b9ed0 TL |
4348 | dhcp_failover_send_contact, link -> state_object, |
4349 | (tvref_t)dhcp_failover_state_reference, | |
4350 | (tvunref_t)dhcp_failover_state_dereference); | |
da292833 | 4351 | } |
d8a417b2 TL |
4352 | return status; |
4353 | ||
4354 | err: | |
61aaca12 TL |
4355 | if (opbuf) |
4356 | dfree (opbuf, MDL); | |
02ca1b45 | 4357 | log_info ("dhcp_failover_put_message: something went wrong."); |
d8a417b2 TL |
4358 | omapi_disconnect (connection, 1); |
4359 | return status; | |
9f3da356 | 4360 | } |
d8a417b2 | 4361 | |
6f0b9ed0 TL |
4362 | void dhcp_failover_timeout (void *vstate) |
4363 | { | |
4364 | dhcp_failover_state_t *state = vstate; | |
4365 | dhcp_failover_link_t *link; | |
6f0b9ed0 | 4366 | |
0db87765 TL |
4367 | #if defined (DEBUG_FAILOVER_TIMING) |
4368 | log_info ("dhcp_failover_timeout"); | |
4369 | #endif | |
4370 | ||
6f0b9ed0 TL |
4371 | if (!state || state -> type != dhcp_type_failover_state) |
4372 | return; | |
6f0b9ed0 TL |
4373 | link = state -> link_to_peer; |
4374 | if (!link || | |
4375 | !link -> outer || | |
4376 | link -> outer -> type != omapi_type_connection) | |
4377 | return; | |
4378 | ||
4379 | log_error ("timeout waiting for failover peer %s", state -> name); | |
4380 | ||
4381 | /* If we haven't gotten a timely response, blow away the connection. | |
4382 | This will cause the state to change automatically. */ | |
4383 | omapi_disconnect (link -> outer, 1); | |
4384 | } | |
4385 | ||
4386 | void dhcp_failover_send_contact (void *vstate) | |
4387 | { | |
4388 | dhcp_failover_state_t *state = vstate; | |
4389 | dhcp_failover_link_t *link; | |
4390 | isc_result_t status; | |
4391 | ||
1387545f DH |
4392 | #if defined(DEBUG_FAILOVER_MESSAGES) && \ |
4393 | defined(DEBUG_FAILOVER_CONTACT_MESSAGES) | |
6f0b9ed0 TL |
4394 | char obuf [64]; |
4395 | unsigned obufix = 0; | |
1387545f DH |
4396 | |
4397 | failover_print(obuf, &obufix, sizeof(obuf), "(contact"); | |
6f0b9ed0 TL |
4398 | #endif |
4399 | ||
1387545f | 4400 | #if defined (DEBUG_FAILOVER_CONTACT_TIMING) |
0db87765 TL |
4401 | log_info ("dhcp_failover_send_contact"); |
4402 | #endif | |
4403 | ||
6f0b9ed0 TL |
4404 | if (!state || state -> type != dhcp_type_failover_state) |
4405 | return; | |
4406 | link = state -> link_to_peer; | |
4407 | if (!link || | |
4408 | !link -> outer || | |
4409 | link -> outer -> type != omapi_type_connection) | |
4410 | return; | |
4411 | ||
4412 | status = (dhcp_failover_put_message | |
4413 | (link, link -> outer, | |
a55ccdd0 | 4414 | FTM_CONTACT, link->xid++, |
02ca1b45 TL |
4415 | (failover_option_t *)0)); |
4416 | ||
1387545f DH |
4417 | #if defined(DEBUG_FAILOVER_MESSAGES) && \ |
4418 | defined(DEBUG_FAILOVER_CONTACT_MESSAGES) | |
02ca1b45 | 4419 | if (status != ISC_R_SUCCESS) |
1387545f DH |
4420 | failover_print(obuf, &obufix, sizeof(obuf), " (failed)"); |
4421 | failover_print(obuf, &obufix, sizeof(obuf), ")"); | |
02ca1b45 TL |
4422 | if (obufix) { |
4423 | log_debug ("%s", obuf); | |
4424 | } | |
dd9237c3 TM |
4425 | #else |
4426 | IGNORE_UNUSED(status); | |
02ca1b45 TL |
4427 | #endif |
4428 | return; | |
4429 | } | |
4430 | ||
4431 | isc_result_t dhcp_failover_send_state (dhcp_failover_state_t *state) | |
4432 | { | |
4433 | dhcp_failover_link_t *link; | |
4434 | isc_result_t status; | |
4435 | ||
6ec59010 | 4436 | #if defined (DEBUG_FAILOVER_MESSAGES) |
02ca1b45 TL |
4437 | char obuf [64]; |
4438 | unsigned obufix = 0; | |
6ec59010 | 4439 | |
02ca1b45 TL |
4440 | # define FMA obuf, &obufix, sizeof obuf |
4441 | failover_print (FMA, "(state"); | |
4442 | #else | |
4443 | # define FMA (char *)0, (unsigned *)0, 0 | |
4444 | #endif | |
4445 | ||
4446 | if (!state || state -> type != dhcp_type_failover_state) | |
98bf1607 | 4447 | return DHCP_R_INVALIDARG; |
02ca1b45 TL |
4448 | link = state -> link_to_peer; |
4449 | if (!link || | |
4450 | !link -> outer || | |
4451 | link -> outer -> type != omapi_type_connection) | |
98bf1607 | 4452 | return DHCP_R_INVALIDARG; |
02ca1b45 TL |
4453 | |
4454 | status = (dhcp_failover_put_message | |
4455 | (link, link -> outer, | |
a55ccdd0 | 4456 | FTM_STATE, link->xid++, |
5f0c7be1 | 4457 | dhcp_failover_make_option (FTO_SERVER_STATE, FMA, |
02ca1b45 TL |
4458 | (state -> me.state == startup |
4459 | ? state -> saved_state | |
4460 | : state -> me.state)), | |
5f0c7be1 TL |
4461 | dhcp_failover_make_option |
4462 | (FTO_SERVER_FLAGS, FMA, | |
4463 | (state -> service_state == service_startup | |
a55ccdd0 | 4464 | ? FTF_SERVER_STARTUP : 0)), |
02ca1b45 | 4465 | dhcp_failover_make_option (FTO_STOS, FMA, state -> me.stos), |
6f0b9ed0 TL |
4466 | (failover_option_t *)0)); |
4467 | ||
4468 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4469 | if (status != ISC_R_SUCCESS) | |
4470 | failover_print (FMA, " (failed)"); | |
4471 | failover_print (FMA, ")"); | |
4472 | if (obufix) { | |
4473 | log_debug ("%s", obuf); | |
4474 | } | |
dd9237c3 TM |
4475 | #else |
4476 | IGNORE_UNUSED(status); | |
6f0b9ed0 | 4477 | #endif |
02ca1b45 | 4478 | return ISC_R_SUCCESS; |
6f0b9ed0 TL |
4479 | } |
4480 | ||
d8a417b2 TL |
4481 | /* Send a connect message. */ |
4482 | ||
4483 | isc_result_t dhcp_failover_send_connect (omapi_object_t *l) | |
4484 | { | |
4485 | dhcp_failover_link_t *link; | |
4486 | dhcp_failover_state_t *state; | |
4487 | isc_result_t status; | |
6ec59010 | 4488 | #if defined (DEBUG_FAILOVER_MESSAGES) |
d8a417b2 TL |
4489 | char obuf [64]; |
4490 | unsigned obufix = 0; | |
6ec59010 | 4491 | |
d8a417b2 TL |
4492 | # define FMA obuf, &obufix, sizeof obuf |
4493 | failover_print (FMA, "(connect"); | |
4494 | #else | |
00c272ee | 4495 | # define FMA (char *)0, (unsigned *)0, 0 |
d8a417b2 TL |
4496 | #endif |
4497 | ||
d8a417b2 | 4498 | if (!l || l -> type != dhcp_type_failover_link) |
98bf1607 | 4499 | return DHCP_R_INVALIDARG; |
d8a417b2 TL |
4500 | link = (dhcp_failover_link_t *)l; |
4501 | state = link -> state_object; | |
4502 | if (!l -> outer || l -> outer -> type != omapi_type_connection) | |
98bf1607 | 4503 | return DHCP_R_INVALIDARG; |
d8a417b2 | 4504 | |
02ca1b45 TL |
4505 | status = |
4506 | (dhcp_failover_put_message | |
4507 | (link, l -> outer, | |
a55ccdd0 DH |
4508 | FTM_CONNECT, link->xid++, |
4509 | dhcp_failover_make_option(FTO_RELATIONSHIP_NAME, FMA, | |
4510 | strlen(state->name), state->name), | |
02ca1b45 TL |
4511 | dhcp_failover_make_option (FTO_MAX_UNACKED, FMA, |
4512 | state -> me.max_flying_updates), | |
4513 | dhcp_failover_make_option (FTO_RECEIVE_TIMER, FMA, | |
4514 | state -> me.max_response_delay), | |
fe5b0fdd DH |
4515 | dhcp_failover_option_printf(FTO_VENDOR_CLASS, FMA, |
4516 | "isc-%s", PACKAGE_VERSION), | |
02ca1b45 TL |
4517 | dhcp_failover_make_option (FTO_PROTOCOL_VERSION, FMA, |
4518 | DHCP_FAILOVER_VERSION), | |
4519 | dhcp_failover_make_option (FTO_TLS_REQUEST, FMA, | |
4520 | 0, 0), | |
4521 | dhcp_failover_make_option (FTO_MCLT, FMA, | |
4522 | state -> mclt), | |
4523 | (state -> hba | |
4524 | ? dhcp_failover_make_option (FTO_HBA, FMA, 32, state -> hba) | |
4525 | : &skip_failover_option), | |
4526 | (failover_option_t *)0)); | |
6ec59010 | 4527 | |
d8a417b2 TL |
4528 | #if defined (DEBUG_FAILOVER_MESSAGES) |
4529 | if (status != ISC_R_SUCCESS) | |
4530 | failover_print (FMA, " (failed)"); | |
4531 | failover_print (FMA, ")"); | |
4532 | if (obufix) { | |
4533 | log_debug ("%s", obuf); | |
4534 | } | |
4535 | #endif | |
4536 | return status; | |
4537 | } | |
4538 | ||
007e3ee4 TL |
4539 | isc_result_t dhcp_failover_send_connectack (omapi_object_t *l, |
4540 | dhcp_failover_state_t *state, | |
4541 | int reason, const char *errmsg) | |
9f3da356 TL |
4542 | { |
4543 | dhcp_failover_link_t *link; | |
9f3da356 | 4544 | isc_result_t status; |
6ec59010 | 4545 | #if defined (DEBUG_FAILOVER_MESSAGES) |
9f3da356 TL |
4546 | char obuf [64]; |
4547 | unsigned obufix = 0; | |
6ec59010 | 4548 | |
9f3da356 TL |
4549 | # define FMA obuf, &obufix, sizeof obuf |
4550 | failover_print (FMA, "(connectack"); | |
4551 | #else | |
00c272ee | 4552 | # define FMA (char *)0, (unsigned *)0, 0 |
9f3da356 TL |
4553 | #endif |
4554 | ||
4555 | if (!l || l -> type != dhcp_type_failover_link) | |
98bf1607 | 4556 | return DHCP_R_INVALIDARG; |
9f3da356 | 4557 | link = (dhcp_failover_link_t *)l; |
9f3da356 | 4558 | if (!l -> outer || l -> outer -> type != omapi_type_connection) |
98bf1607 | 4559 | return DHCP_R_INVALIDARG; |
dd53dc5a | 4560 | |
02ca1b45 TL |
4561 | status = |
4562 | (dhcp_failover_put_message | |
4563 | (link, l -> outer, | |
a55ccdd0 DH |
4564 | FTM_CONNECTACK, link->imsg->xid, |
4565 | state | |
4566 | ? dhcp_failover_make_option(FTO_RELATIONSHIP_NAME, FMA, | |
4567 | strlen(state->name), state->name) | |
4568 | : (link->imsg->options_present & FTB_RELATIONSHIP_NAME) | |
30e42327 SR |
4569 | ? dhcp_failover_make_option(FTO_RELATIONSHIP_NAME, FMA, |
4570 | link->imsg->relationship_name.count, | |
4571 | link->imsg->relationship_name.data) | |
a55ccdd0 DH |
4572 | : &skip_failover_option, |
4573 | state | |
02ca1b45 TL |
4574 | ? dhcp_failover_make_option (FTO_MAX_UNACKED, FMA, |
4575 | state -> me.max_flying_updates) | |
a55ccdd0 DH |
4576 | : &skip_failover_option, |
4577 | state | |
02ca1b45 TL |
4578 | ? dhcp_failover_make_option (FTO_RECEIVE_TIMER, FMA, |
4579 | state -> me.max_response_delay) | |
a55ccdd0 | 4580 | : &skip_failover_option, |
fe5b0fdd DH |
4581 | dhcp_failover_option_printf(FTO_VENDOR_CLASS, FMA, |
4582 | "isc-%s", PACKAGE_VERSION), | |
02ca1b45 TL |
4583 | dhcp_failover_make_option (FTO_PROTOCOL_VERSION, FMA, |
4584 | DHCP_FAILOVER_VERSION), | |
a55ccdd0 DH |
4585 | (link->imsg->options_present & FTB_TLS_REQUEST) |
4586 | ? dhcp_failover_make_option(FTO_TLS_REPLY, FMA, | |
4587 | 0, 0) | |
4588 | : &skip_failover_option, | |
4589 | reason | |
02ca1b45 TL |
4590 | ? dhcp_failover_make_option (FTO_REJECT_REASON, |
4591 | FMA, reason) | |
a55ccdd0 DH |
4592 | : &skip_failover_option, |
4593 | (reason && errmsg) | |
02ca1b45 TL |
4594 | ? dhcp_failover_make_option (FTO_MESSAGE, FMA, |
4595 | strlen (errmsg), errmsg) | |
a55ccdd0 | 4596 | : &skip_failover_option, |
02ca1b45 | 4597 | (failover_option_t *)0)); |
9f3da356 TL |
4598 | |
4599 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4600 | if (status != ISC_R_SUCCESS) | |
4601 | failover_print (FMA, " (failed)"); | |
4602 | failover_print (FMA, ")"); | |
4603 | if (obufix) { | |
4604 | log_debug ("%s", obuf); | |
4605 | } | |
4606 | #endif | |
4607 | return status; | |
4608 | } | |
4609 | ||
4610 | isc_result_t dhcp_failover_send_disconnect (omapi_object_t *l, | |
4611 | int reason, | |
4612 | const char *message) | |
dd53dc5a TL |
4613 | { |
4614 | dhcp_failover_link_t *link; | |
dd53dc5a | 4615 | isc_result_t status; |
6ec59010 | 4616 | #if defined (DEBUG_FAILOVER_MESSAGES) |
dd53dc5a TL |
4617 | char obuf [64]; |
4618 | unsigned obufix = 0; | |
6ec59010 | 4619 | |
dd53dc5a | 4620 | # define FMA obuf, &obufix, sizeof obuf |
9f3da356 | 4621 | failover_print (FMA, "(disconnect"); |
dd53dc5a | 4622 | #else |
00c272ee | 4623 | # define FMA (char *)0, (unsigned *)0, 0 |
dd53dc5a TL |
4624 | #endif |
4625 | ||
9f3da356 | 4626 | if (!l || l -> type != dhcp_type_failover_link) |
98bf1607 | 4627 | return DHCP_R_INVALIDARG; |
9f3da356 | 4628 | link = (dhcp_failover_link_t *)l; |
9f3da356 | 4629 | if (!l -> outer || l -> outer -> type != omapi_type_connection) |
98bf1607 | 4630 | return DHCP_R_INVALIDARG; |
dd53dc5a | 4631 | |
8c8e27c5 TL |
4632 | if (!message && reason) |
4633 | message = dhcp_failover_reject_reason_print (reason); | |
4634 | ||
9f3da356 TL |
4635 | status = (dhcp_failover_put_message |
4636 | (link, l -> outer, | |
a55ccdd0 | 4637 | FTM_DISCONNECT, link->xid++, |
9f3da356 TL |
4638 | dhcp_failover_make_option (FTO_REJECT_REASON, |
4639 | FMA, reason), | |
4640 | (message | |
8c8e27c5 TL |
4641 | ? dhcp_failover_make_option (FTO_MESSAGE, FMA, |
4642 | strlen (message), message) | |
4643 | : &skip_failover_option), | |
9f3da356 TL |
4644 | (failover_option_t *)0)); |
4645 | ||
4646 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4647 | if (status != ISC_R_SUCCESS) | |
4648 | failover_print (FMA, " (failed)"); | |
4649 | failover_print (FMA, ")"); | |
4650 | if (obufix) { | |
4651 | log_debug ("%s", obuf); | |
4652 | } | |
4653 | #endif | |
4654 | return status; | |
4655 | } | |
4656 | ||
4657 | /* Send a Bind Update message. */ | |
4658 | ||
4659 | isc_result_t dhcp_failover_send_bind_update (dhcp_failover_state_t *state, | |
4660 | struct lease *lease) | |
4661 | { | |
4662 | dhcp_failover_link_t *link; | |
4663 | isc_result_t status; | |
a55ccdd0 DH |
4664 | int flags = 0; |
4665 | binding_state_t transmit_state; | |
6ec59010 | 4666 | #if defined (DEBUG_FAILOVER_MESSAGES) |
9f3da356 TL |
4667 | char obuf [64]; |
4668 | unsigned obufix = 0; | |
6ec59010 | 4669 | |
9f3da356 TL |
4670 | # define FMA obuf, &obufix, sizeof obuf |
4671 | failover_print (FMA, "(bndupd"); | |
4672 | #else | |
00c272ee | 4673 | # define FMA (char *)0, (unsigned *)0, 0 |
9f3da356 TL |
4674 | #endif |
4675 | ||
4676 | if (!state -> link_to_peer || | |
4677 | state -> link_to_peer -> type != dhcp_type_failover_link) | |
98bf1607 | 4678 | return DHCP_R_INVALIDARG; |
9f3da356 | 4679 | link = (dhcp_failover_link_t *)state -> link_to_peer; |
dd53dc5a TL |
4680 | |
4681 | if (!link -> outer || link -> outer -> type != omapi_type_connection) | |
98bf1607 | 4682 | return DHCP_R_INVALIDARG; |
dd53dc5a | 4683 | |
a55ccdd0 DH |
4684 | transmit_state = lease->desired_binding_state; |
4685 | if (lease->flags & RESERVED_LEASE) { | |
4686 | /* If we are listing an allocable (not yet ACTIVE etc) lease | |
4687 | * as reserved, toggle to the peer's 'free state', per the | |
4688 | * draft. This gives the peer permission to alloc it to the | |
4689 | * chaddr/uid-named client. | |
4690 | */ | |
4691 | if ((state->i_am == primary) && (transmit_state == FTS_FREE)) | |
4692 | transmit_state = FTS_BACKUP; | |
4693 | else if ((state->i_am == secondary) && | |
4694 | (transmit_state == FTS_BACKUP)) | |
4695 | transmit_state = FTS_FREE; | |
4696 | ||
4697 | flags |= FTF_IP_FLAG_RESERVE; | |
4698 | } | |
4699 | if (lease->flags & BOOTP_LEASE) | |
4700 | flags |= FTF_IP_FLAG_BOOTP; | |
4701 | ||
4702 | /* last_xid == 0 is illegal, seek past zero if we hit it. */ | |
4703 | if (link->xid == 0) | |
4704 | link->xid = 1; | |
4705 | ||
4706 | lease->last_xid = link->xid++; | |
4707 | ||
fdfebedf DH |
4708 | /* |
4709 | * Our very next action is to transmit a binding update relating to | |
4710 | * this lease over the wire, and although there is a BNDACK, there is | |
4711 | * no BNDACKACK or BNDACKACKACK...the basic issue as we send a BNDUPD, | |
4712 | * we may not receive a BNDACK. This non-reception does not imply the | |
4713 | * peer did not receive and process the BNDUPD. So at this point, we | |
4714 | * must divest any state that would be dangerous to retain under the | |
4715 | * impression the peer has been updated. Normally state changes like | |
4716 | * this are processed in supersede_lease(), but in this case we need a | |
4717 | * very late binding. | |
4718 | * | |
4719 | * In failover rules, a server is permitted to work forward in certain | |
4720 | * directions from a given lease's state; active leases may be | |
4721 | * extended, so forth. There is an 'optimization' in the failover | |
4722 | * draft that permits a server to 'rewind' any work they have not | |
4723 | * informed the peer. Since we can't know if the peer received our | |
4724 | * update but was unable to acknowledge it, we make this change on | |
4725 | * transmit rather than upon receiving the acknowledgement. | |
4726 | * | |
4727 | * XXX: Frequent lease commits are undesirable. This should hopefully | |
4728 | * only trigger when a server is sending a lease /state change/, and | |
4729 | * not merely an update such as with a renewal. | |
4730 | */ | |
4731 | if (lease->rewind_binding_state != lease->binding_state) { | |
4732 | lease->rewind_binding_state = lease->binding_state; | |
4733 | ||
4734 | write_lease(lease); | |
4735 | commit_leases(); | |
4736 | } | |
4737 | ||
8c8e27c5 | 4738 | /* Send the update. */ |
dd53dc5a TL |
4739 | status = (dhcp_failover_put_message |
4740 | (link, link -> outer, | |
a55ccdd0 | 4741 | FTM_BNDUPD, lease->last_xid, |
dd53dc5a | 4742 | dhcp_failover_make_option (FTO_ASSIGNED_IP_ADDRESS, FMA, |
85a53735 | 4743 | lease -> ip_addr.len, |
dd53dc5a TL |
4744 | lease -> ip_addr.iabuf), |
4745 | dhcp_failover_make_option (FTO_BINDING_STATUS, FMA, | |
98311e4b | 4746 | lease -> desired_binding_state), |
dd53dc5a TL |
4747 | lease -> uid_len |
4748 | ? dhcp_failover_make_option (FTO_CLIENT_IDENTIFIER, FMA, | |
25a69ca1 TL |
4749 | lease -> uid_len, |
4750 | lease -> uid) | |
dd53dc5a | 4751 | : &skip_failover_option, |
8c8e27c5 TL |
4752 | lease -> hardware_addr.hlen |
4753 | ? dhcp_failover_make_option (FTO_CHADDR, FMA, | |
4754 | lease -> hardware_addr.hlen, | |
4755 | lease -> hardware_addr.hbuf) | |
4756 | : &skip_failover_option, | |
dd53dc5a TL |
4757 | dhcp_failover_make_option (FTO_LEASE_EXPIRY, FMA, |
4758 | lease -> ends), | |
4759 | dhcp_failover_make_option (FTO_POTENTIAL_EXPIRY, FMA, | |
4760 | lease -> tstp), | |
4761 | dhcp_failover_make_option (FTO_STOS, FMA, | |
4762 | lease -> starts), | |
6ec59010 | 4763 | (lease->cltt != 0) ? |
1387545f DH |
4764 | dhcp_failover_make_option(FTO_CLTT, FMA, lease->cltt) : |
4765 | &skip_failover_option, /* No CLTT */ | |
a55ccdd0 DH |
4766 | flags ? dhcp_failover_make_option(FTO_IP_FLAGS, FMA, |
4767 | flags) : | |
4768 | &skip_failover_option, /* No IP_FLAGS */ | |
dd53dc5a TL |
4769 | &skip_failover_option, /* XXX DDNS */ |
4770 | &skip_failover_option, /* XXX request options */ | |
4771 | &skip_failover_option, /* XXX reply options */ | |
4772 | (failover_option_t *)0)); | |
4773 | ||
4774 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4775 | if (status != ISC_R_SUCCESS) | |
4776 | failover_print (FMA, " (failed)"); | |
4777 | failover_print (FMA, ")"); | |
4778 | if (obufix) { | |
4779 | log_debug ("%s", obuf); | |
4780 | } | |
4781 | #endif | |
4782 | return status; | |
4783 | } | |
4784 | ||
8c8e27c5 TL |
4785 | /* Send a Bind ACK message. */ |
4786 | ||
4787 | isc_result_t dhcp_failover_send_bind_ack (dhcp_failover_state_t *state, | |
8c8e27c5 TL |
4788 | failover_message_t *msg, |
4789 | int reason, const char *message) | |
4790 | { | |
4791 | dhcp_failover_link_t *link; | |
4792 | isc_result_t status; | |
6ec59010 | 4793 | #if defined (DEBUG_FAILOVER_MESSAGES) |
8c8e27c5 TL |
4794 | char obuf [64]; |
4795 | unsigned obufix = 0; | |
6ec59010 | 4796 | |
8c8e27c5 TL |
4797 | # define FMA obuf, &obufix, sizeof obuf |
4798 | failover_print (FMA, "(bndack"); | |
4799 | #else | |
00c272ee | 4800 | # define FMA (char *)0, (unsigned *)0, 0 |
8c8e27c5 TL |
4801 | #endif |
4802 | ||
4803 | if (!state -> link_to_peer || | |
4804 | state -> link_to_peer -> type != dhcp_type_failover_link) | |
98bf1607 | 4805 | return DHCP_R_INVALIDARG; |
8c8e27c5 TL |
4806 | link = (dhcp_failover_link_t *)state -> link_to_peer; |
4807 | ||
4808 | if (!link -> outer || link -> outer -> type != omapi_type_connection) | |
98bf1607 | 4809 | return DHCP_R_INVALIDARG; |
8c8e27c5 | 4810 | |
8c8e27c5 TL |
4811 | if (!message && reason) |
4812 | message = dhcp_failover_reject_reason_print (reason); | |
4813 | ||
4814 | /* Send the update. */ | |
4815 | status = (dhcp_failover_put_message | |
4816 | (link, link -> outer, | |
a55ccdd0 | 4817 | FTM_BNDACK, msg->xid, |
8c8e27c5 | 4818 | dhcp_failover_make_option (FTO_ASSIGNED_IP_ADDRESS, FMA, |
6f0b9ed0 TL |
4819 | sizeof msg -> assigned_addr, |
4820 | &msg -> assigned_addr), | |
a55ccdd0 | 4821 | #ifdef DO_BNDACK_SHOULD_NOT |
8c8e27c5 | 4822 | dhcp_failover_make_option (FTO_BINDING_STATUS, FMA, |
6f0b9ed0 TL |
4823 | msg -> binding_status), |
4824 | (msg -> options_present & FTB_CLIENT_IDENTIFIER) | |
8c8e27c5 | 4825 | ? dhcp_failover_make_option (FTO_CLIENT_IDENTIFIER, FMA, |
6f0b9ed0 TL |
4826 | msg -> client_identifier.count, |
4827 | msg -> client_identifier.data) | |
8c8e27c5 | 4828 | : &skip_failover_option, |
6f0b9ed0 | 4829 | (msg -> options_present & FTB_CHADDR) |
8c8e27c5 | 4830 | ? dhcp_failover_make_option (FTO_CHADDR, FMA, |
6f0b9ed0 TL |
4831 | msg -> chaddr.count, |
4832 | msg -> chaddr.data) | |
8c8e27c5 TL |
4833 | : &skip_failover_option, |
4834 | dhcp_failover_make_option (FTO_LEASE_EXPIRY, FMA, | |
4835 | msg -> expiry), | |
4836 | dhcp_failover_make_option (FTO_POTENTIAL_EXPIRY, FMA, | |
4837 | msg -> potential_expiry), | |
4838 | dhcp_failover_make_option (FTO_STOS, FMA, | |
4839 | msg -> stos), | |
1387545f DH |
4840 | (msg->options_present & FTB_CLTT) ? |
4841 | dhcp_failover_make_option(FTO_CLTT, FMA, msg->cltt) : | |
4842 | &skip_failover_option, /* No CLTT in the msg to ack. */ | |
6ec59010 | 4843 | ((msg->options_present & FTB_IP_FLAGS) && msg->ip_flags) ? |
a55ccdd0 DH |
4844 | dhcp_failover_make_option(FTO_IP_FLAGS, FMA, |
4845 | msg->ip_flags) | |
4846 | : &skip_failover_option, | |
4847 | #endif /* DO_BNDACK_SHOULD_NOT */ | |
8c8e27c5 | 4848 | reason |
a55ccdd0 DH |
4849 | ? dhcp_failover_make_option(FTO_REJECT_REASON, FMA, reason) |
4850 | : &skip_failover_option, | |
4851 | (reason && message) | |
8c8e27c5 TL |
4852 | ? dhcp_failover_make_option (FTO_MESSAGE, FMA, |
4853 | strlen (message), message) | |
a55ccdd0 DH |
4854 | : &skip_failover_option, |
4855 | #ifdef DO_BNDACK_SHOULD_NOT | |
8c8e27c5 TL |
4856 | &skip_failover_option, /* XXX DDNS */ |
4857 | &skip_failover_option, /* XXX request options */ | |
4858 | &skip_failover_option, /* XXX reply options */ | |
a55ccdd0 | 4859 | #endif /* DO_BNDACK_SHOULD_NOT */ |
8c8e27c5 TL |
4860 | (failover_option_t *)0)); |
4861 | ||
4862 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4863 | if (status != ISC_R_SUCCESS) | |
4864 | failover_print (FMA, " (failed)"); | |
4865 | failover_print (FMA, ")"); | |
4866 | if (obufix) { | |
4867 | log_debug ("%s", obuf); | |
4868 | } | |
4869 | #endif | |
4870 | return status; | |
4871 | } | |
4872 | ||
4873 | isc_result_t dhcp_failover_send_poolreq (dhcp_failover_state_t *state) | |
4874 | { | |
4875 | dhcp_failover_link_t *link; | |
4876 | isc_result_t status; | |
6ec59010 | 4877 | #if defined (DEBUG_FAILOVER_MESSAGES) |
8c8e27c5 TL |
4878 | char obuf [64]; |
4879 | unsigned obufix = 0; | |
6ec59010 | 4880 | |
8c8e27c5 TL |
4881 | # define FMA obuf, &obufix, sizeof obuf |
4882 | failover_print (FMA, "(poolreq"); | |
4883 | #else | |
00c272ee | 4884 | # define FMA (char *)0, (unsigned *)0, 0 |
8c8e27c5 TL |
4885 | #endif |
4886 | ||
4887 | if (!state -> link_to_peer || | |
4888 | state -> link_to_peer -> type != dhcp_type_failover_link) | |
98bf1607 | 4889 | return DHCP_R_INVALIDARG; |
8c8e27c5 TL |
4890 | link = (dhcp_failover_link_t *)state -> link_to_peer; |
4891 | ||
4892 | if (!link -> outer || link -> outer -> type != omapi_type_connection) | |
98bf1607 | 4893 | return DHCP_R_INVALIDARG; |
8c8e27c5 TL |
4894 | |
4895 | status = (dhcp_failover_put_message | |
4896 | (link, link -> outer, | |
a55ccdd0 | 4897 | FTM_POOLREQ, link->xid++, |
8c8e27c5 TL |
4898 | (failover_option_t *)0)); |
4899 | ||
4900 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4901 | if (status != ISC_R_SUCCESS) | |
4902 | failover_print (FMA, " (failed)"); | |
4903 | failover_print (FMA, ")"); | |
4904 | if (obufix) { | |
4905 | log_debug ("%s", obuf); | |
4906 | } | |
4907 | #endif | |
4908 | return status; | |
4909 | } | |
4910 | ||
4911 | isc_result_t dhcp_failover_send_poolresp (dhcp_failover_state_t *state, | |
4912 | int leases) | |
4913 | { | |
4914 | dhcp_failover_link_t *link; | |
4915 | isc_result_t status; | |
6ec59010 | 4916 | #if defined (DEBUG_FAILOVER_MESSAGES) |
8c8e27c5 TL |
4917 | char obuf [64]; |
4918 | unsigned obufix = 0; | |
6ec59010 | 4919 | |
8c8e27c5 | 4920 | # define FMA obuf, &obufix, sizeof obuf |
007e3ee4 | 4921 | failover_print (FMA, "(poolresp"); |
8c8e27c5 | 4922 | #else |
00c272ee | 4923 | # define FMA (char *)0, (unsigned *)0, 0 |
8c8e27c5 TL |
4924 | #endif |
4925 | ||
4926 | if (!state -> link_to_peer || | |
4927 | state -> link_to_peer -> type != dhcp_type_failover_link) | |
98bf1607 | 4928 | return DHCP_R_INVALIDARG; |
8c8e27c5 TL |
4929 | link = (dhcp_failover_link_t *)state -> link_to_peer; |
4930 | ||
4931 | if (!link -> outer || link -> outer -> type != omapi_type_connection) | |
98bf1607 | 4932 | return DHCP_R_INVALIDARG; |
8c8e27c5 TL |
4933 | |
4934 | status = (dhcp_failover_put_message | |
4935 | (link, link -> outer, | |
a55ccdd0 | 4936 | FTM_POOLRESP, link->imsg->xid, |
8c8e27c5 TL |
4937 | dhcp_failover_make_option (FTO_ADDRESSES_TRANSFERRED, FMA, |
4938 | leases), | |
4939 | (failover_option_t *)0)); | |
4940 | ||
4941 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
4942 | if (status != ISC_R_SUCCESS) | |
4943 | failover_print (FMA, " (failed)"); | |
4944 | failover_print (FMA, ")"); | |
4945 | if (obufix) { | |
4946 | log_debug ("%s", obuf); | |
4947 | } | |
4948 | #endif | |
4949 | return status; | |
4950 | } | |
4951 | ||
5f0c7be1 TL |
4952 | isc_result_t dhcp_failover_send_update_request (dhcp_failover_state_t *state) |
4953 | { | |
4954 | dhcp_failover_link_t *link; | |
4955 | isc_result_t status; | |
6ec59010 | 4956 | #if defined (DEBUG_FAILOVER_MESSAGES) |
5f0c7be1 TL |
4957 | char obuf [64]; |
4958 | unsigned obufix = 0; | |
988c1ca7 | 4959 | |
5f0c7be1 TL |
4960 | # define FMA obuf, &obufix, sizeof obuf |
4961 | failover_print (FMA, "(updreq"); | |
4962 | #else | |
4963 | # define FMA (char *)0, (unsigned *)0, 0 | |
4964 | #endif | |
4965 | ||
21d30347 SR |
4966 | if (!state->link_to_peer || |
4967 | state->link_to_peer->type != dhcp_type_failover_link) | |
4968 | return (DHCP_R_INVALIDARG); | |
4969 | link = (dhcp_failover_link_t *)state->link_to_peer; | |
5f0c7be1 | 4970 | |
21d30347 SR |
4971 | if (!link->outer || link->outer->type != omapi_type_connection) |
4972 | return (DHCP_R_INVALIDARG); | |
5f0c7be1 | 4973 | |
21d30347 SR |
4974 | /* We allow an update to be restarted in case we requested an update |
4975 | * and were interrupted by something. If we had an ALL going we need | |
4976 | * to restart that. Otherwise we simply continue with the request */ | |
4977 | if (state->curUPD == FTM_UPDREQALL) { | |
4978 | return (dhcp_failover_send_update_request_all(state)); | |
4979 | } | |
98311e4b | 4980 | |
21d30347 SR |
4981 | status = (dhcp_failover_put_message(link, link->outer, FTM_UPDREQ, |
4982 | link->xid++, NULL)); | |
5f0c7be1 | 4983 | |
21d30347 | 4984 | state->curUPD = FTM_UPDREQ; |
98311e4b | 4985 | |
5f0c7be1 TL |
4986 | #if defined (DEBUG_FAILOVER_MESSAGES) |
4987 | if (status != ISC_R_SUCCESS) | |
21d30347 SR |
4988 | failover_print(FMA, " (failed)"); |
4989 | failover_print(FMA, ")"); | |
5f0c7be1 | 4990 | if (obufix) { |
21d30347 | 4991 | log_debug("%s", obuf); |
5f0c7be1 TL |
4992 | } |
4993 | #endif | |
21d30347 SR |
4994 | |
4995 | if (status == ISC_R_SUCCESS) { | |
4996 | log_info("Sent update request message to %s", state->name); | |
4997 | } else { | |
4998 | log_error("Failed to send update request all message to %s: %s", | |
4999 | state->name, isc_result_totext(status)); | |
5000 | } | |
5001 | return (status); | |
5f0c7be1 TL |
5002 | } |
5003 | ||
5004 | isc_result_t dhcp_failover_send_update_request_all (dhcp_failover_state_t | |
5005 | *state) | |
5006 | { | |
5007 | dhcp_failover_link_t *link; | |
5008 | isc_result_t status; | |
6ec59010 | 5009 | #if defined (DEBUG_FAILOVER_MESSAGES) |
5f0c7be1 TL |
5010 | char obuf [64]; |
5011 | unsigned obufix = 0; | |
6ec59010 | 5012 | |
5f0c7be1 TL |
5013 | # define FMA obuf, &obufix, sizeof obuf |
5014 | failover_print (FMA, "(updreqall"); | |
5015 | #else | |
5016 | # define FMA (char *)0, (unsigned *)0, 0 | |
5017 | #endif | |
5018 | ||
21d30347 SR |
5019 | if (!state->link_to_peer || |
5020 | state->link_to_peer->type != dhcp_type_failover_link) | |
5021 | return (DHCP_R_INVALIDARG); | |
5022 | link = (dhcp_failover_link_t *)state->link_to_peer; | |
5f0c7be1 | 5023 | |
21d30347 SR |
5024 | if (!link->outer || link->outer->type != omapi_type_connection) |
5025 | return (DHCP_R_INVALIDARG); | |
5f0c7be1 | 5026 | |
21d30347 SR |
5027 | /* We allow an update to be restarted in case we requested an update |
5028 | * and were interrupted by something. | |
5029 | */ | |
98311e4b | 5030 | |
21d30347 SR |
5031 | status = (dhcp_failover_put_message(link, link->outer, FTM_UPDREQALL, |
5032 | link->xid++, NULL)); | |
5f0c7be1 | 5033 | |
21d30347 | 5034 | state->curUPD = FTM_UPDREQALL; |
98311e4b | 5035 | |
5f0c7be1 TL |
5036 | #if defined (DEBUG_FAILOVER_MESSAGES) |
5037 | if (status != ISC_R_SUCCESS) | |
21d30347 SR |
5038 | failover_print(FMA, " (failed)"); |
5039 | failover_print(FMA, ")"); | |
5f0c7be1 | 5040 | if (obufix) { |
21d30347 | 5041 | log_debug("%s", obuf); |
5f0c7be1 TL |
5042 | } |
5043 | #endif | |
21d30347 SR |
5044 | |
5045 | if (status == ISC_R_SUCCESS) { | |
5046 | log_info("Sent update request all message to %s", state->name); | |
5047 | } else { | |
5048 | log_error("Failed to send update request all message to %s: %s", | |
5049 | state->name, isc_result_totext(status)); | |
5050 | } | |
5051 | return (status); | |
5f0c7be1 TL |
5052 | } |
5053 | ||
5054 | isc_result_t dhcp_failover_send_update_done (dhcp_failover_state_t *state) | |
5055 | { | |
5056 | dhcp_failover_link_t *link; | |
5057 | isc_result_t status; | |
6ec59010 | 5058 | #if defined (DEBUG_FAILOVER_MESSAGES) |
5f0c7be1 TL |
5059 | char obuf [64]; |
5060 | unsigned obufix = 0; | |
6ec59010 | 5061 | |
5f0c7be1 TL |
5062 | # define FMA obuf, &obufix, sizeof obuf |
5063 | failover_print (FMA, "(upddone"); | |
5064 | #else | |
5065 | # define FMA (char *)0, (unsigned *)0, 0 | |
5066 | #endif | |
5067 | ||
5068 | if (!state -> link_to_peer || | |
5069 | state -> link_to_peer -> type != dhcp_type_failover_link) | |
98bf1607 | 5070 | return DHCP_R_INVALIDARG; |
5f0c7be1 TL |
5071 | link = (dhcp_failover_link_t *)state -> link_to_peer; |
5072 | ||
5073 | if (!link -> outer || link -> outer -> type != omapi_type_connection) | |
98bf1607 | 5074 | return DHCP_R_INVALIDARG; |
5f0c7be1 TL |
5075 | |
5076 | status = (dhcp_failover_put_message | |
5077 | (link, link -> outer, | |
a55ccdd0 | 5078 | FTM_UPDDONE, state->updxid, |
5f0c7be1 TL |
5079 | (failover_option_t *)0)); |
5080 | ||
5081 | #if defined (DEBUG_FAILOVER_MESSAGES) | |
5082 | if (status != ISC_R_SUCCESS) | |
5083 | failover_print (FMA, " (failed)"); | |
5084 | failover_print (FMA, ")"); | |
5085 | if (obufix) { | |
5086 | log_debug ("%s", obuf); | |
5087 | } | |
5088 | #endif | |
988c1ca7 | 5089 | |
98311e4b DH |
5090 | log_info ("Sent update done message to %s", state -> name); |
5091 | ||
a55ccdd0 DH |
5092 | state->updxid--; /* Paranoia, just so it mismatches. */ |
5093 | ||
988c1ca7 DN |
5094 | /* There may be uncommitted leases at this point (since |
5095 | dhcp_failover_process_bind_ack() doesn't commit leases); | |
5096 | commit the lease file. */ | |
5097 | commit_leases(); | |
5098 | ||
5f0c7be1 TL |
5099 | return status; |
5100 | } | |
5101 | ||
1387545f DH |
5102 | /* |
5103 | * failover_lease_is_better() compares the binding update in 'msg' with | |
5104 | * the current lease in 'lease'. If the determination is that the binding | |
5105 | * update shouldn't be allowed to update/crush more critical binding info | |
5106 | * on the lease, the lease is preferred. A value of true is returned if the | |
5107 | * local lease is preferred, or false if the remote binding update is | |
5108 | * preferred. | |
5109 | * | |
5110 | * For now this function is hopefully simplistic and trivial. It may be that | |
5111 | * a more detailed system of preferences is required, so this is something we | |
5112 | * should monitor as we gain experience with these dueling events. | |
5113 | */ | |
5114 | static isc_boolean_t | |
5115 | failover_lease_is_better(dhcp_failover_state_t *state, struct lease *lease, | |
5116 | failover_message_t *msg) | |
5117 | { | |
5118 | binding_state_t local_state; | |
5119 | TIME msg_cltt; | |
5120 | ||
5121 | if (lease->binding_state != lease->desired_binding_state) | |
5122 | local_state = lease->desired_binding_state; | |
5123 | else | |
5124 | local_state = lease->binding_state; | |
5125 | ||
5126 | if ((msg->options_present & FTB_CLTT) != 0) | |
5127 | msg_cltt = msg->cltt; | |
5128 | else | |
5129 | msg_cltt = 0; | |
5130 | ||
5131 | switch(local_state) { | |
5132 | case FTS_ACTIVE: | |
5133 | if (msg->binding_status == FTS_ACTIVE) { | |
5134 | if (msg_cltt < lease->cltt) | |
5135 | return ISC_TRUE; | |
5136 | else if (msg_cltt > lease->cltt) | |
5137 | return ISC_FALSE; | |
5138 | else if (state->i_am == primary) | |
5139 | return ISC_TRUE; | |
5140 | else | |
5141 | return ISC_FALSE; | |
5142 | } else if (msg->binding_status == FTS_EXPIRED) { | |
5143 | return ISC_FALSE; | |
5144 | } | |
5145 | /* FALL THROUGH */ | |
5146 | ||
5147 | case FTS_FREE: | |
5148 | case FTS_BACKUP: | |
5149 | case FTS_EXPIRED: | |
5150 | case FTS_RELEASED: | |
5151 | case FTS_ABANDONED: | |
5152 | case FTS_RESET: | |
5153 | if (msg->binding_status == FTS_ACTIVE) | |
5154 | return ISC_FALSE; | |
5155 | else if (state->i_am == primary) | |
5156 | return ISC_TRUE; | |
5157 | else | |
5158 | return ISC_FALSE; | |
5159 | /* FALL THROUGH to impossible condition */ | |
5160 | ||
5161 | default: | |
5162 | log_fatal("Impossible condition at %s:%d.", MDL); | |
5163 | } | |
5164 | ||
5165 | log_fatal("Impossible condition at %s:%d.", MDL); | |
5166 | /* Silence compiler warning. */ | |
5167 | return ISC_FALSE; | |
5168 | } | |
5169 | ||
8c8e27c5 TL |
5170 | isc_result_t dhcp_failover_process_bind_update (dhcp_failover_state_t *state, |
5171 | failover_message_t *msg) | |
5172 | { | |
0f750c4f | 5173 | struct lease *lt = NULL, *lease = NULL; |
8c8e27c5 | 5174 | struct iaddr ia; |
20916cae TL |
5175 | int reason = FTR_MISC_REJECT; |
5176 | const char *message; | |
007e3ee4 | 5177 | int new_binding_state; |
2426234f | 5178 | int send_to_backup = 0; |
1387545f | 5179 | int required_options; |
b8d45c67 DH |
5180 | isc_boolean_t chaddr_changed = ISC_FALSE; |
5181 | isc_boolean_t ident_changed = ISC_FALSE; | |
1387545f DH |
5182 | |
5183 | /* Validate the binding update. */ | |
5184 | required_options = FTB_ASSIGNED_IP_ADDRESS | FTB_BINDING_STATUS; | |
5185 | if ((msg->options_present & required_options) != required_options) { | |
5186 | message = "binding update lacks required options"; | |
5187 | reason = FTR_MISSING_BINDINFO; | |
5188 | goto bad; | |
5189 | } | |
8c8e27c5 TL |
5190 | |
5191 | ia.len = sizeof msg -> assigned_addr; | |
5192 | memcpy (ia.iabuf, &msg -> assigned_addr, ia.len); | |
5193 | ||
20916cae TL |
5194 | if (!find_lease_by_ip_addr (&lease, ia, MDL)) { |
5195 | message = "unknown IP address"; | |
5196 | reason = FTR_ILLEGAL_IP_ADDR; | |
5197 | goto bad; | |
8c8e27c5 TL |
5198 | } |
5199 | ||
1387545f DH |
5200 | /* |
5201 | * If this lease is covered by a different failover peering | |
5202 | * relationship, assert an error. | |
5203 | */ | |
5204 | if ((lease->pool == NULL) || (lease->pool->failover_peer == NULL) || | |
5205 | (lease->pool->failover_peer != state)) { | |
5206 | message = "IP address is covered by a different failover " | |
5207 | "relationship state"; | |
5208 | reason = FTR_ILLEGAL_IP_ADDR; | |
5209 | goto bad; | |
5210 | } | |
8c8e27c5 | 5211 | |
1387545f DH |
5212 | /* |
5213 | * Dueling updates: This happens when both servers send a BNDUPD | |
5214 | * at the same time. We want the best update to win, which means | |
5215 | * we reject if we think ours is better, or cancel if we think the | |
5216 | * peer's is better. We only assert a problem if the lease is on | |
5217 | * the ACK queue, not on the UPDATE queue. This means that after | |
5218 | * accepting this server's BNDUPD, we will send our own BNDUPD | |
5219 | * /after/ sending the BNDACK (this order was recently enforced in | |
5220 | * queue processing). | |
5221 | */ | |
5222 | if ((lease->flags & ON_ACK_QUEUE) != 0) { | |
5223 | if (failover_lease_is_better(state, lease, msg)) { | |
5224 | message = "incoming update is less critical than " | |
5225 | "outgoing update"; | |
5226 | reason = FTR_LESS_CRIT_BIND_INFO; | |
5227 | goto bad; | |
5228 | } else { | |
5229 | /* This makes it so we ignore any spurious ACKs. */ | |
5230 | dhcp_failover_ack_queue_remove(state, lease); | |
5231 | } | |
5232 | } | |
5233 | ||
5234 | /* Install the new info. Start by taking a copy to markup. */ | |
20916cae TL |
5235 | if (!lease_copy (<, lease, MDL)) { |
5236 | message = "no memory"; | |
5237 | goto bad; | |
5238 | } | |
8c8e27c5 TL |
5239 | |
5240 | if (msg -> options_present & FTB_CHADDR) { | |
98311e4b DH |
5241 | if (msg->binding_status == FTS_ABANDONED) { |
5242 | message = "BNDUPD to ABANDONED with a CHADDR"; | |
5243 | goto bad; | |
5244 | } | |
20916cae | 5245 | if (msg -> chaddr.count > sizeof lt -> hardware_addr.hbuf) { |
88cd8aca | 5246 | message = "chaddr too long"; |
20916cae | 5247 | goto bad; |
8c8e27c5 | 5248 | } |
b8d45c67 DH |
5249 | |
5250 | if ((lt->hardware_addr.hlen != msg->chaddr.count) || | |
5251 | (memcmp(lt->hardware_addr.hbuf, msg->chaddr.data, | |
5252 | msg->chaddr.count) != 0)) | |
5253 | chaddr_changed = ISC_TRUE; | |
5254 | ||
20916cae TL |
5255 | lt -> hardware_addr.hlen = msg -> chaddr.count; |
5256 | memcpy (lt -> hardware_addr.hbuf, msg -> chaddr.data, | |
8c8e27c5 | 5257 | msg -> chaddr.count); |
98311e4b DH |
5258 | } else if (msg->binding_status == FTS_ACTIVE || |
5259 | msg->binding_status == FTS_EXPIRED || | |
5260 | msg->binding_status == FTS_RELEASED) { | |
5261 | message = "BNDUPD without CHADDR"; | |
1387545f | 5262 | reason = FTR_MISSING_BINDINFO; |
98311e4b DH |
5263 | goto bad; |
5264 | } else if (msg->binding_status == FTS_ABANDONED) { | |
b8d45c67 | 5265 | chaddr_changed = ISC_TRUE; |
98311e4b DH |
5266 | lt->hardware_addr.hlen = 0; |
5267 | if (lt->scope) | |
5268 | binding_scope_dereference(<->scope, MDL); | |
5269 | } | |
5270 | ||
5271 | /* There is no explicit message content to indicate that the client | |
5272 | * supplied no client-identifier. So if we don't hear of a value, | |
5273 | * we discard the last one. | |
5274 | */ | |
5275 | if (msg->options_present & FTB_CLIENT_IDENTIFIER) { | |
5276 | if (msg->binding_status == FTS_ABANDONED) { | |
5277 | message = "BNDUPD to ABANDONED with client-id"; | |
5278 | goto bad; | |
5279 | } | |
8c8e27c5 | 5280 | |
b8d45c67 DH |
5281 | if ((lt->uid_len != msg->client_identifier.count) || |
5282 | (lt->uid == NULL) || /* Sanity; should never happen. */ | |
5283 | (memcmp(lt->uid, msg->client_identifier.data, | |
5284 | lt->uid_len) != 0)) | |
5285 | ident_changed = ISC_TRUE; | |
5286 | ||
98311e4b DH |
5287 | lt->uid_len = msg->client_identifier.count; |
5288 | ||
5289 | /* Allocate the lt->uid buffer if we haven't already, or | |
5290 | * re-allocate the lt-uid buffer if we have one that is not | |
5291 | * large enough. Otherwise, just use the extant buffer. | |
5292 | */ | |
5293 | if (!lt->uid || lt->uid == lt->uid_buf || | |
5294 | lt->uid_len > lt->uid_max) { | |
5295 | if (lt->uid && lt->uid != lt->uid_buf) | |
5296 | dfree(lt->uid, MDL); | |
5297 | ||
5298 | if (lt->uid_len > sizeof(lt->uid_buf)) { | |
5299 | lt->uid_max = lt->uid_len; | |
5300 | lt->uid = dmalloc(lt->uid_len, MDL); | |
5301 | if (!lt->uid) { | |
5302 | message = "no memory"; | |
5303 | goto bad; | |
5304 | } | |
5305 | } else { | |
5306 | lt->uid_max = sizeof(lt->uid_buf); | |
5307 | lt->uid = lt->uid_buf; | |
20916cae | 5308 | } |
8c8e27c5 | 5309 | } |
20916cae TL |
5310 | memcpy (lt -> uid, |
5311 | msg -> client_identifier.data, lt -> uid_len); | |
98311e4b DH |
5312 | } else if (lt->uid && msg->binding_status != FTS_RESET && |
5313 | msg->binding_status != FTS_FREE && | |
5314 | msg->binding_status != FTS_BACKUP) { | |
b8d45c67 | 5315 | ident_changed = ISC_TRUE; |
98311e4b DH |
5316 | if (lt->uid != lt->uid_buf) |
5317 | dfree (lt->uid, MDL); | |
5318 | lt->uid = NULL; | |
5319 | lt->uid_max = lt->uid_len = 0; | |
8c8e27c5 | 5320 | } |
98311e4b | 5321 | |
b8d45c67 DH |
5322 | /* |
5323 | * A server's configuration can assign a 'binding scope'; | |
5324 | * | |
5325 | * set var = "value"; | |
5326 | * | |
5327 | * The problem with these binding scopes is that they are refreshed | |
5328 | * when the server processes a client's DHCP packet. A local binding | |
5329 | * scope is trash, then, when the lease has been assigned by the | |
5330 | * partner server. There is no real way to detect this, a peer may | |
5331 | * be updating us (as through potential conflict) with a binding we | |
5332 | * sent them, but we can trivially detect the /problematic/ case; | |
5333 | * | |
5334 | * lease is free. | |
5335 | * primary allocates lease to client A, assigns ddns name A. | |
5336 | * primary fails. | |
5337 | * secondary enters partner down. | |
5338 | * lease expires, and is set free. | |
5339 | * lease is allocated to client B and given ddns name B. | |
5340 | * primary recovers. | |
5341 | * | |
5342 | * The binding update in this case will be active->active, but the | |
5343 | * client identification on the lease will have changed. The ddns | |
5344 | * update on client A will have leaked if we just remove the binding | |
5345 | * scope blindly. | |
5346 | */ | |
5347 | if (msg->binding_status == FTS_ACTIVE && | |
5348 | (chaddr_changed || ident_changed)) { | |
158a34fb | 5349 | #if defined (NSUPDATE) |
d13db163 | 5350 | (void) ddns_removals(lease, NULL, NULL, ISC_FALSE); |
158a34fb | 5351 | #endif /* NSUPDATE */ |
b8d45c67 DH |
5352 | |
5353 | if (lease->scope != NULL) | |
5354 | binding_scope_dereference(&lease->scope, MDL); | |
5355 | } | |
98311e4b | 5356 | |
8c8e27c5 TL |
5357 | /* XXX Times may need to be adjusted based on clock skew! */ |
5358 | if (msg -> options_present & FTB_STOS) { | |
20916cae | 5359 | lt -> starts = msg -> stos; |
8c8e27c5 TL |
5360 | } |
5361 | if (msg -> options_present & FTB_LEASE_EXPIRY) { | |
20916cae | 5362 | lt -> ends = msg -> expiry; |
8c8e27c5 | 5363 | } |
88cd8aca DH |
5364 | if (msg->options_present & FTB_POTENTIAL_EXPIRY) { |
5365 | lt->atsfp = lt->tsfp = msg->potential_expiry; | |
8c8e27c5 | 5366 | } |
a55ccdd0 DH |
5367 | if (msg->options_present & FTB_IP_FLAGS) { |
5368 | if (msg->ip_flags & FTF_IP_FLAG_RESERVE) { | |
5369 | if ((((state->i_am == primary) && | |
5370 | (lease->binding_state == FTS_FREE)) || | |
5371 | ((state->i_am == secondary) && | |
5372 | (lease->binding_state == FTS_BACKUP))) && | |
5373 | !(lease->flags & RESERVED_LEASE)) { | |
5374 | message = "Address is not reserved."; | |
5375 | reason = FTR_IP_NOT_RESERVED; | |
5376 | goto bad; | |
5377 | } | |
5378 | ||
5379 | lt->flags |= RESERVED_LEASE; | |
5380 | } else | |
5381 | lt->flags &= ~RESERVED_LEASE; | |
5382 | ||
5383 | if (msg->ip_flags & FTF_IP_FLAG_BOOTP) { | |
5384 | if ((((state->i_am == primary) && | |
5385 | (lease->binding_state == FTS_FREE)) || | |
5386 | ((state->i_am == secondary) && | |
5387 | (lease->binding_state == FTS_BACKUP))) && | |
5388 | !(lease->flags & BOOTP_LEASE)) { | |
5389 | message = "Address is not allocated to BOOTP."; | |
5390 | goto bad; | |
5391 | } | |
5392 | lt->flags |= BOOTP_LEASE; | |
5393 | } else | |
5394 | lt->flags &= ~BOOTP_LEASE; | |
5395 | ||
5396 | if (msg->ip_flags & ~(FTF_IP_FLAG_RESERVE | FTF_IP_FLAG_BOOTP)) | |
5397 | log_info("Unknown IP-flags set in BNDUPD (0x%x).", | |
5398 | msg->ip_flags); | |
5399 | } else /* Flags may only not appear if the values are zero. */ | |
5400 | lt->flags &= ~(RESERVED_LEASE | BOOTP_LEASE); | |
8c8e27c5 | 5401 | |
d758ad8c | 5402 | #if defined (DEBUG_LEASE_STATE_TRANSITIONS) |
1387545f DH |
5403 | log_info ("processing state transition for %s: %s to %s", |
5404 | piaddr (lease -> ip_addr), | |
5405 | binding_state_print (lease -> binding_state), | |
5406 | binding_state_print (msg -> binding_status)); | |
d758ad8c TL |
5407 | #endif |
5408 | ||
1387545f DH |
5409 | /* If we're in normal state, make sure the state transition |
5410 | we got is valid. */ | |
5411 | if (state -> me.state == normal) { | |
5412 | new_binding_state = | |
5413 | (normal_binding_state_transition_check | |
5414 | (lease, state, msg -> binding_status, | |
5415 | msg -> potential_expiry)); | |
5416 | /* XXX if the transition the peer asked for isn't | |
5417 | XXX allowed, maybe we should make the transition | |
5418 | XXX into potential-conflict at this point. */ | |
5419 | } else { | |
5420 | new_binding_state = | |
5421 | (conflict_binding_state_transition_check | |
5422 | (lease, state, msg -> binding_status, | |
5423 | msg -> potential_expiry)); | |
5424 | } | |
5425 | if (new_binding_state != msg -> binding_status) { | |
5426 | char outbuf [100]; | |
5427 | ||
5428 | if (snprintf (outbuf, sizeof outbuf, | |
5429 | "%s: invalid state transition: %s to %s", | |
5430 | piaddr (lease -> ip_addr), | |
5431 | binding_state_print (lease -> binding_state), | |
5432 | binding_state_print (msg -> binding_status)) | |
5433 | >= sizeof outbuf) | |
5434 | log_fatal ("%s: impossible outbuf overflow", | |
5435 | "dhcp_failover_process_bind_update"); | |
5436 | ||
5437 | dhcp_failover_send_bind_ack (state, msg, | |
5438 | FTR_FATAL_CONFLICT, | |
5439 | outbuf); | |
5440 | goto out; | |
5441 | } | |
5442 | if (new_binding_state == FTS_EXPIRED || | |
5443 | new_binding_state == FTS_RELEASED || | |
5444 | new_binding_state == FTS_RESET) { | |
5445 | lt -> next_binding_state = FTS_FREE; | |
5446 | ||
5447 | /* Mac address affinity. Assign the lease to | |
5448 | * BACKUP state if we are the primary and the | |
5449 | * peer is more likely to reallocate this lease | |
5450 | * to a returning client. | |
5451 | */ | |
5452 | if ((state->i_am == primary) && | |
5453 | !(lt->flags & (RESERVED_LEASE | BOOTP_LEASE))) | |
5454 | send_to_backup = peer_wants_lease(lt); | |
5455 | } else { | |
5456 | lt -> next_binding_state = new_binding_state; | |
8c8e27c5 | 5457 | } |
1387545f | 5458 | msg -> binding_status = lt -> next_binding_state; |
8c8e27c5 | 5459 | |
fdfebedf DH |
5460 | /* |
5461 | * If we accept a peer's binding update, then we can't rewind a | |
5462 | * lease behind the peer's state. | |
5463 | */ | |
5464 | lease->rewind_binding_state = lt->next_binding_state; | |
5465 | ||
8c8e27c5 | 5466 | /* Try to install the new information. */ |
491bf4a2 | 5467 | if (!supersede_lease (lease, lt, 0, 0, 0, 0) || |
988c1ca7 | 5468 | !write_lease (lease)) { |
20916cae TL |
5469 | message = "database update failed"; |
5470 | bad: | |
988c1ca7 | 5471 | dhcp_failover_send_bind_ack (state, msg, reason, message); |
2426234f | 5472 | goto out; |
d758ad8c | 5473 | } else { |
988c1ca7 | 5474 | dhcp_failover_queue_ack (state, msg); |
d758ad8c | 5475 | } |
988c1ca7 | 5476 | |
2426234f DH |
5477 | /* If it is probably wise, assign lease to backup state if the peer |
5478 | * is not already hoarding leases. | |
5479 | */ | |
808d45fd DH |
5480 | if (send_to_backup && secondary_not_hoarding(state, lease->pool)) { |
5481 | lease->next_binding_state = FTS_BACKUP; | |
5482 | lease->tstp = cur_time; | |
5483 | lease->starts = cur_time; | |
2426234f | 5484 | |
491bf4a2 | 5485 | if (!supersede_lease(lease, NULL, 0, 1, 0, 0) || |
808d45fd | 5486 | !write_lease(lease)) |
2426234f | 5487 | log_error("can't commit lease %s for mac addr " |
808d45fd | 5488 | "affinity", piaddr(lease->ip_addr)); |
2426234f DH |
5489 | |
5490 | dhcp_failover_send_updates(state); | |
5491 | } | |
5492 | ||
54bdf6c7 | 5493 | out: |
20916cae TL |
5494 | if (lt) |
5495 | lease_dereference (<, MDL); | |
6f0b9ed0 TL |
5496 | if (lease) |
5497 | lease_dereference (&lease, MDL); | |
8c8e27c5 | 5498 | |
9f3da356 TL |
5499 | return ISC_R_SUCCESS; |
5500 | } | |
5501 | ||
2426234f DH |
5502 | /* This was hairy enough I didn't want to do it all in an if statement. |
5503 | * | |
5504 | * Returns: Truth is the secondary is allowed to get more leases based upon | |
5505 | * MAC address affinity. False otherwise. | |
5506 | */ | |
a34feb7d | 5507 | static inline int |
2426234f DH |
5508 | secondary_not_hoarding(dhcp_failover_state_t *state, struct pool *p) { |
5509 | int total; | |
5510 | int hold; | |
5511 | int lts; | |
5512 | ||
5513 | total = p->free_leases + p->backup_leases; | |
5514 | ||
5515 | /* How many leases is one side or the other allowed to "hold"? */ | |
5516 | hold = ((total * state->max_lease_ownership) + 50) / 100; | |
5517 | ||
5518 | /* If we were to send leases (or if the secondary were to send us | |
5519 | * leases in the negative direction), how many would that be? | |
5520 | */ | |
5521 | lts = (p->free_leases - p->backup_leases) / 2; | |
5522 | ||
5523 | /* The peer is not hoarding leases if we would send them more leases | |
5524 | * (or they would take fewer leases) than the maximum they are allowed | |
5525 | * to hold (the negative hold). | |
5526 | */ | |
5527 | return(lts > -hold); | |
5528 | } | |
5529 | ||
8c8e27c5 TL |
5530 | isc_result_t dhcp_failover_process_bind_ack (dhcp_failover_state_t *state, |
5531 | failover_message_t *msg) | |
5532 | { | |
45086eef | 5533 | struct lease *lease = NULL; |
8c8e27c5 | 5534 | struct iaddr ia; |
20916cae | 5535 | const char *message = "no memory"; |
a55ccdd0 | 5536 | u_int32_t pot_expire; |
808d45fd | 5537 | int send_to_backup = ISC_FALSE; |
be62cf06 | 5538 | struct timeval tv; |
8c8e27c5 TL |
5539 | |
5540 | ia.len = sizeof msg -> assigned_addr; | |
5541 | memcpy (ia.iabuf, &msg -> assigned_addr, ia.len); | |
5542 | ||
20916cae TL |
5543 | if (!find_lease_by_ip_addr (&lease, ia, MDL)) { |
5544 | message = "no such lease"; | |
5545 | goto bad; | |
8c8e27c5 TL |
5546 | } |
5547 | ||
5548 | /* XXX check for conflicts. */ | |
6f0b9ed0 TL |
5549 | if (msg -> options_present & FTB_REJECT_REASON) { |
5550 | log_error ("bind update on %s from %s rejected: %.*s", | |
5551 | piaddr (ia), state -> name, | |
5552 | (int)((msg -> options_present & FTB_MESSAGE) | |
5553 | ? msg -> message.count | |
5554 | : strlen (dhcp_failover_reject_reason_print | |
5555 | (msg -> reject_reason))), | |
5556 | (msg -> options_present & FTB_MESSAGE) | |
5557 | ? (const char *)(msg -> message.data) | |
5558 | : (dhcp_failover_reject_reason_print | |
5559 | (msg -> reject_reason))); | |
5560 | goto unqueue; | |
5561 | } | |
8c8e27c5 | 5562 | |
808d45fd DH |
5563 | /* Silently discard acks for leases we did not update (or multiple |
5564 | * acks). | |
5565 | */ | |
5566 | if (!lease->last_xid) | |
5567 | goto unqueue; | |
5568 | ||
5569 | if (lease->last_xid != msg->xid) { | |
5570 | message = "xid mismatch"; | |
5571 | goto bad; | |
5572 | } | |
5573 | ||
8c8e27c5 | 5574 | /* XXX Times may need to be adjusted based on clock skew! */ |
a55ccdd0 DH |
5575 | if (msg->options_present & FTO_POTENTIAL_EXPIRY) |
5576 | pot_expire = msg->potential_expiry; | |
808d45fd | 5577 | else |
a55ccdd0 | 5578 | pot_expire = lease->tstp; |
a55ccdd0 | 5579 | |
808d45fd DH |
5580 | /* If the lease was desired to enter a binding state, we set |
5581 | * such a value upon transmitting a bndupd. We do not clear it | |
5582 | * if we receive a bndupd in the meantime (or change the state | |
5583 | * of the lease again ourselves), but we do set binding_state | |
5584 | * if we get a bndupd. | |
5585 | * | |
5586 | * So desired_binding_state tells us what we sent a bndupd for, | |
5587 | * and binding_state tells us what we have since determined in | |
5588 | * the meantime. | |
5589 | */ | |
5590 | if (lease->desired_binding_state == FTS_EXPIRED || | |
5591 | lease->desired_binding_state == FTS_RESET || | |
5592 | lease->desired_binding_state == FTS_RELEASED) | |
a55ccdd0 | 5593 | { |
808d45fd DH |
5594 | /* It is not a problem to do this directly as we call |
5595 | * supersede_lease immediately after: the lease is requeued | |
5596 | * even if its sort order (tsfp) has changed. | |
5597 | */ | |
d084a789 | 5598 | lease->atsfp = lease->tsfp = pot_expire; |
a55ccdd0 DH |
5599 | if ((state->i_am == secondary) && |
5600 | (lease->flags & RESERVED_LEASE)) | |
5601 | lease->next_binding_state = FTS_BACKUP; | |
5602 | else | |
5603 | lease->next_binding_state = FTS_FREE; | |
fdfebedf | 5604 | |
808d45fd DH |
5605 | /* Clear this condition for the next go-round. */ |
5606 | lease->desired_binding_state = lease->next_binding_state; | |
fdfebedf DH |
5607 | |
5608 | /* The peer will have made this state change, so set rewind. */ | |
5609 | lease->rewind_binding_state = lease->next_binding_state; | |
5610 | ||
491bf4a2 | 5611 | supersede_lease(lease, NULL, 0, 0, 0, 0); |
a55ccdd0 | 5612 | write_lease(lease); |
2426234f DH |
5613 | |
5614 | /* Lease has returned to FREE state from the | |
5615 | * transitional states. If the lease 'belongs' | |
5616 | * to a client that would be served by the | |
5617 | * peer, process a binding update now to send | |
808d45fd DH |
5618 | * the lease to backup state. But not if we |
5619 | * think we already have. | |
2426234f DH |
5620 | */ |
5621 | if (state->i_am == primary && | |
2b9ce770 | 5622 | !(lease->flags & (RESERVED_LEASE | BOOTP_LEASE)) && |
808d45fd DH |
5623 | peer_wants_lease(lease)) |
5624 | send_to_backup = ISC_TRUE; | |
2426234f | 5625 | |
808d45fd DH |
5626 | if (!send_to_backup && state->me.state == normal) |
5627 | commit_leases(); | |
a55ccdd0 | 5628 | } else { |
808d45fd DH |
5629 | /* XXX It could be a problem to do this directly if the lease |
5630 | * XXX is sorted by tsfp. | |
5631 | */ | |
d084a789 | 5632 | lease->atsfp = lease->tsfp = pot_expire; |
a55ccdd0 DH |
5633 | if (lease->desired_binding_state != lease->binding_state) { |
5634 | lease->next_binding_state = | |
5635 | lease->desired_binding_state; | |
491bf4a2 | 5636 | supersede_lease(lease, NULL, 0, 0, 0, 0); |
31bbee78 | 5637 | } |
a55ccdd0 DH |
5638 | write_lease(lease); |
5639 | /* Commit the lease only after a two-second timeout, | |
5640 | so that if we get a bunch of acks in quick | |
20ae1aff | 5641 | succession (e.g., when stealing leases from the |
a55ccdd0 DH |
5642 | secondary), we do not do an immediate commit for |
5643 | each one. */ | |
be62cf06 FD |
5644 | tv.tv_sec = cur_time + 2; |
5645 | tv.tv_usec = 0; | |
5646 | add_timeout(&tv, commit_leases_timeout, (void *)0, 0, 0); | |
8c8e27c5 TL |
5647 | } |
5648 | ||
6f0b9ed0 | 5649 | unqueue: |
8c8e27c5 TL |
5650 | dhcp_failover_ack_queue_remove (state, lease); |
5651 | ||
5f0c7be1 TL |
5652 | /* If we are supposed to send an update done after we send |
5653 | this lease, go ahead and send it. */ | |
5654 | if (state -> send_update_done == lease) { | |
5655 | lease_dereference (&state -> send_update_done, MDL); | |
5656 | dhcp_failover_send_update_done (state); | |
5657 | } | |
5658 | ||
a512cc3a | 5659 | /* Now that the lease is off the ack queue, consider putting it |
808d45fd DH |
5660 | * back on the update queue for mac address affinity. |
5661 | */ | |
5662 | if (send_to_backup && secondary_not_hoarding(state, lease->pool)) { | |
5663 | lease->next_binding_state = FTS_BACKUP; | |
5664 | lease->tstp = lease->starts = cur_time; | |
5665 | ||
491bf4a2 | 5666 | if (!supersede_lease(lease, NULL, 0, 1, 0, 0) || |
808d45fd DH |
5667 | !write_lease(lease)) |
5668 | log_error("can't commit lease %s for " | |
5669 | "client affinity", piaddr(lease->ip_addr)); | |
5670 | ||
5671 | if (state->me.state == normal) | |
5672 | commit_leases(); | |
5673 | } | |
5674 | ||
8c8e27c5 TL |
5675 | /* If there are updates pending, we've created space to send at |
5676 | least one. */ | |
5677 | dhcp_failover_send_updates (state); | |
5678 | ||
20916cae TL |
5679 | out: |
5680 | lease_dereference (&lease, MDL); | |
9f3da356 | 5681 | return ISC_R_SUCCESS; |
20916cae TL |
5682 | |
5683 | bad: | |
808d45fd | 5684 | log_info ("bind update on %s got ack from %s: %s.", |
20916cae TL |
5685 | piaddr (ia), state -> name, message); |
5686 | goto out; | |
9f3da356 TL |
5687 | } |
5688 | ||
5f0c7be1 TL |
5689 | isc_result_t dhcp_failover_generate_update_queue (dhcp_failover_state_t *state, |
5690 | int everythingp) | |
5691 | { | |
5692 | struct shared_network *s; | |
5693 | struct pool *p; | |
28868515 | 5694 | struct lease *l; |
5f0c7be1 | 5695 | int i; |
5f0c7be1 TL |
5696 | #define FREE_LEASES 0 |
5697 | #define ACTIVE_LEASES 1 | |
5698 | #define EXPIRED_LEASES 2 | |
5699 | #define ABANDONED_LEASES 3 | |
5700 | #define BACKUP_LEASES 4 | |
616d67cb | 5701 | #define RESERVED_LEASES 5 |
3933e2aa | 5702 | LEASE_STRUCT_PTR lptr[RESERVED_LEASES+1]; |
5f0c7be1 | 5703 | |
5f0c7be1 TL |
5704 | /* Loop through each pool in each shared network and call the |
5705 | expiry routine on the pool. */ | |
5706 | for (s = shared_networks; s; s = s -> next) { | |
5707 | for (p = s -> pools; p; p = p -> next) { | |
88cd8aca DH |
5708 | if (p->failover_peer != state) |
5709 | continue; | |
5710 | ||
616d67cb DH |
5711 | lptr[FREE_LEASES] = &p->free; |
5712 | lptr[ACTIVE_LEASES] = &p->active; | |
5713 | lptr[EXPIRED_LEASES] = &p->expired; | |
5714 | lptr[ABANDONED_LEASES] = &p->abandoned; | |
5715 | lptr[BACKUP_LEASES] = &p->backup; | |
5716 | lptr[RESERVED_LEASES] = &p->reserved; | |
5f0c7be1 | 5717 | |
616d67cb | 5718 | for (i = FREE_LEASES; i <= RESERVED_LEASES; i++) { |
3933e2aa SR |
5719 | for (l = LEASE_GET_FIRSTP(lptr[i]); |
5720 | l != NULL; | |
5721 | l = LEASE_GET_NEXTP(lptr[i], l)) { | |
4c7ffd58 | 5722 | if ((l->flags & ON_QUEUE) == 0 && |
616d67cb DH |
5723 | (everythingp || |
5724 | (l->tstp > l->atsfp) || | |
5725 | (i == EXPIRED_LEASES))) { | |
98311e4b | 5726 | l -> desired_binding_state = l -> binding_state; |
5f0c7be1 TL |
5727 | dhcp_failover_queue_update (l, 0); |
5728 | } | |
5729 | } | |
5730 | } | |
5731 | } | |
5732 | } | |
5733 | return ISC_R_SUCCESS; | |
5734 | } | |
5735 | ||
5736 | isc_result_t | |
5737 | dhcp_failover_process_update_request (dhcp_failover_state_t *state, | |
5738 | failover_message_t *msg) | |
5739 | { | |
616d67cb DH |
5740 | if (state->send_update_done) { |
5741 | log_info("Received update request while old update still " | |
5742 | "flying! Silently discarding old request."); | |
5743 | lease_dereference(&state->send_update_done, MDL); | |
5744 | } | |
5745 | ||
5f0c7be1 TL |
5746 | /* Generate a fresh update queue. */ |
5747 | dhcp_failover_generate_update_queue (state, 0); | |
5748 | ||
a55ccdd0 DH |
5749 | state->updxid = msg->xid; |
5750 | ||
5f0c7be1 TL |
5751 | /* If there's anything on the update queue (there shouldn't be |
5752 | anything on the ack queue), trigger an update done message | |
5753 | when we get an ack for that lease. */ | |
5754 | if (state -> update_queue_tail) { | |
5755 | lease_reference (&state -> send_update_done, | |
5756 | state -> update_queue_tail, MDL); | |
5757 | dhcp_failover_send_updates (state); | |
98311e4b DH |
5758 | log_info ("Update request from %s: sending update", |
5759 | state -> name); | |
5f0c7be1 TL |
5760 | } else { |
5761 | /* Otherwise, there are no updates to send, so we can | |
5762 | just send an UPDDONE message immediately. */ | |
5763 | dhcp_failover_send_update_done (state); | |
98311e4b DH |
5764 | log_info ("Update request from %s: nothing pending", |
5765 | state -> name); | |
5f0c7be1 TL |
5766 | } |
5767 | ||
5768 | return ISC_R_SUCCESS; | |
5769 | } | |
5770 | ||
5771 | isc_result_t | |
5772 | dhcp_failover_process_update_request_all (dhcp_failover_state_t *state, | |
5773 | failover_message_t *msg) | |
5774 | { | |
616d67cb DH |
5775 | if (state->send_update_done) { |
5776 | log_info("Received update request while old update still " | |
5777 | "flying! Silently discarding old request."); | |
5778 | lease_dereference(&state->send_update_done, MDL); | |
5779 | } | |
5780 | ||
5f0c7be1 TL |
5781 | /* Generate a fresh update queue that includes every lease. */ |
5782 | dhcp_failover_generate_update_queue (state, 1); | |
5783 | ||
a55ccdd0 DH |
5784 | state->updxid = msg->xid; |
5785 | ||
5f0c7be1 TL |
5786 | if (state -> update_queue_tail) { |
5787 | lease_reference (&state -> send_update_done, | |
5788 | state -> update_queue_tail, MDL); | |
5789 | dhcp_failover_send_updates (state); | |
98311e4b DH |
5790 | log_info ("Update request all from %s: sending update", |
5791 | state -> name); | |
5f0c7be1 TL |
5792 | } else { |
5793 | /* This should really never happen, but it could happen | |
5794 | on a server that currently has no leases configured. */ | |
5795 | dhcp_failover_send_update_done (state); | |
98311e4b DH |
5796 | log_info ("Update request all from %s: nothing pending", |
5797 | state -> name); | |
5f0c7be1 TL |
5798 | } |
5799 | ||
5800 | return ISC_R_SUCCESS; | |
5801 | } | |
5802 | ||
5803 | isc_result_t | |
5804 | dhcp_failover_process_update_done (dhcp_failover_state_t *state, | |
fd273e02 | 5805 | failover_message_t *msg) |
5f0c7be1 | 5806 | { |
be62cf06 FD |
5807 | struct timeval tv; |
5808 | ||
755acf88 TL |
5809 | log_info ("failover peer %s: peer update completed.", |
5810 | state -> name); | |
5811 | ||
98311e4b DH |
5812 | state -> curUPD = 0; |
5813 | ||
02ca1b45 | 5814 | switch (state -> me.state) { |
5f0c7be1 TL |
5815 | case unknown_state: |
5816 | case partner_down: | |
5817 | case normal: | |
5818 | case communications_interrupted: | |
5819 | case resolution_interrupted: | |
5820 | case shut_down: | |
5821 | case paused: | |
5822 | case recover_done: | |
d9539882 | 5823 | case startup: |
fd273e02 | 5824 | case recover_wait: |
5f0c7be1 TL |
5825 | break; /* shouldn't happen. */ |
5826 | ||
5827 | /* We got the UPDDONE, so we can go into normal state! */ | |
5828 | case potential_conflict: | |
a55ccdd0 DH |
5829 | if (state->partner.state == conflict_done) { |
5830 | if (state->i_am == secondary) { | |
5831 | dhcp_failover_set_state (state, normal); | |
5832 | } else { | |
5833 | log_error("Secondary is in conflict_done " | |
5834 | "state after conflict resolution, " | |
5835 | "this is illegal."); | |
5836 | dhcp_failover_set_state (state, shut_down); | |
5837 | } | |
5838 | } else { | |
5839 | if (state->i_am == primary) | |
5840 | dhcp_failover_set_state (state, conflict_done); | |
5841 | else | |
5842 | log_error("Spurious update-done message."); | |
5843 | } | |
5844 | ||
5845 | break; | |
5846 | ||
5847 | case conflict_done: | |
5848 | log_error("Spurious update-done message."); | |
5f0c7be1 TL |
5849 | break; |
5850 | ||
5851 | case recover: | |
37d8bfeb TL |
5852 | /* Wait for MCLT to expire before moving to recover_done, |
5853 | except that if both peers come up in recover, there is | |
5854 | no point in waiting for MCLT to expire - this probably | |
5855 | indicates the initial startup of a newly-configured | |
5856 | failover pair. */ | |
5857 | if (state -> me.stos + state -> mclt > cur_time && | |
5858 | state -> partner.state != recover && | |
5859 | state -> partner.state != recover_done) { | |
fd273e02 | 5860 | dhcp_failover_set_state (state, recover_wait); |
0db87765 TL |
5861 | #if defined (DEBUG_FAILOVER_TIMING) |
5862 | log_info ("add_timeout +%d %s", | |
5863 | (int)(cur_time - | |
5864 | state -> me.stos + state -> mclt), | |
5865 | "dhcp_failover_recover_done"); | |
5866 | #endif | |
be62cf06 FD |
5867 | tv . tv_sec = (int)(state -> me.stos + state -> mclt); |
5868 | tv . tv_usec = 0; | |
5869 | add_timeout (&tv, | |
5f0c7be1 TL |
5870 | dhcp_failover_recover_done, |
5871 | state, | |
5872 | (tvref_t)omapi_object_reference, | |
5873 | (tvunref_t) | |
5874 | omapi_object_dereference); | |
da292833 | 5875 | } else |
5f0c7be1 TL |
5876 | dhcp_failover_recover_done (state); |
5877 | } | |
5878 | ||
5879 | return ISC_R_SUCCESS; | |
5880 | } | |
5881 | ||
5882 | void dhcp_failover_recover_done (void *sp) | |
5883 | { | |
5884 | dhcp_failover_state_t *state = sp; | |
5885 | ||
0db87765 TL |
5886 | #if defined (DEBUG_FAILOVER_TIMING) |
5887 | log_info ("dhcp_failover_recover_done"); | |
5888 | #endif | |
5889 | ||
5f0c7be1 TL |
5890 | dhcp_failover_set_state (state, recover_done); |
5891 | } | |
5892 | ||
d8a417b2 TL |
5893 | #if defined (DEBUG_FAILOVER_MESSAGES) |
5894 | /* Print hunks of failover messages, doing line breaks as appropriate. | |
5895 | Note that this assumes syslog is being used, rather than, e.g., the | |
5896 | Windows NT logging facility, where just dumping the whole message in | |
5897 | one hunk would be more appropriate. */ | |
5898 | ||
5899 | void failover_print (char *obuf, | |
5900 | unsigned *obufix, unsigned obufmax, const char *s) | |
5901 | { | |
5902 | int len = strlen (s); | |
5903 | ||
9f3da356 TL |
5904 | while (len + *obufix + 1 >= obufmax) { |
5905 | log_debug ("%s", obuf); | |
d8a417b2 TL |
5906 | if (!*obufix) { |
5907 | log_debug ("%s", s); | |
9f3da356 | 5908 | *obufix = 0; |
d8a417b2 TL |
5909 | return; |
5910 | } | |
d8a417b2 | 5911 | *obufix = 0; |
d8a417b2 | 5912 | } |
9f3da356 TL |
5913 | strcpy (&obuf [*obufix], s); |
5914 | *obufix += len; | |
6ec59010 | 5915 | } |
d8a417b2 | 5916 | #endif /* defined (DEBUG_FAILOVER_MESSAGES) */ |
d50d0b82 | 5917 | |
85a53735 TL |
5918 | /* Taken from draft-ietf-dhc-loadb-01.txt: */ |
5919 | /* A "mixing table" of 256 distinct values, in pseudo-random order. */ | |
5920 | unsigned char loadb_mx_tbl[256] = { | |
5921 | 251, 175, 119, 215, 81, 14, 79, 191, 103, 49, | |
5922 | 181, 143, 186, 157, 0, 232, 31, 32, 55, 60, | |
5923 | 152, 58, 17, 237, 174, 70, 160, 144, 220, 90, | |
5924 | 57, 223, 59, 3, 18, 140, 111, 166, 203, 196, | |
5925 | 134, 243, 124, 95, 222, 179, 197, 65, 180, 48, | |
5926 | 36, 15, 107, 46, 233, 130, 165, 30, 123, 161, | |
5927 | 209, 23, 97, 16, 40, 91, 219, 61, 100, 10, | |
5928 | 210, 109, 250, 127, 22, 138, 29, 108, 244, 67, | |
5929 | 207, 9, 178, 204, 74, 98, 126, 249, 167, 116, | |
5930 | 34, 77, 193, 200, 121, 5, 20, 113, 71, 35, | |
5931 | 128, 13, 182, 94, 25, 226, 227, 199, 75, 27, | |
5932 | 41, 245, 230, 224, 43, 225, 177, 26, 155, 150, | |
5933 | 212, 142, 218, 115, 241, 73, 88, 105, 39, 114, | |
5934 | 62, 255, 192, 201, 145, 214, 168, 158, 221, 148, | |
5935 | 154, 122, 12, 84, 82, 163, 44, 139, 228, 236, | |
5936 | 205, 242, 217, 11, 187, 146, 159, 64, 86, 239, | |
5937 | 195, 42, 106, 198, 118, 112, 184, 172, 87, 2, | |
5938 | 173, 117, 176, 229, 247, 253, 137, 185, 99, 164, | |
5939 | 102, 147, 45, 66, 231, 52, 141, 211, 194, 206, | |
5940 | 246, 238, 56, 110, 78, 248, 63, 240, 189, 93, | |
5941 | 92, 51, 53, 183, 19, 171, 72, 50, 33, 104, | |
5942 | 101, 69, 8, 252, 83, 120, 76, 135, 85, 54, | |
5943 | 202, 125, 188, 213, 96, 235, 136, 208, 162, 129, | |
5944 | 190, 132, 156, 38, 47, 1, 7, 254, 24, 4, | |
5945 | 216, 131, 89, 21, 28, 133, 37, 153, 149, 80, | |
5946 | 170, 68, 6, 169, 234, 151 }; | |
5947 | ||
5948 | static unsigned char loadb_p_hash (const unsigned char *, unsigned); | |
5949 | static unsigned char loadb_p_hash (const unsigned char *key, unsigned len) | |
5950 | { | |
5951 | unsigned char hash = len; | |
5952 | int i; | |
5953 | for(i = len; i > 0; ) | |
5954 | hash = loadb_mx_tbl [hash ^ (key [--i])]; | |
5955 | return hash; | |
5956 | } | |
5957 | ||
5958 | int load_balance_mine (struct packet *packet, dhcp_failover_state_t *state) | |
5959 | { | |
5960 | struct option_cache *oc; | |
5961 | struct data_string ds; | |
5962 | unsigned char hbaix; | |
5963 | int hm; | |
6ec59010 | 5964 | u_int16_t ec; |
85a53735 | 5965 | |
dbd65517 SR |
5966 | ec = ntohs(packet->raw->secs); |
5967 | ||
dbd65517 SR |
5968 | /* |
5969 | * If desired check to see if the secs field may have been byte | |
5970 | * swapped. We assume it has if the high order byte isn't cleared | |
5971 | * while the low order byte is cleared. In this case we swap the | |
5972 | * bytes and continue processing. | |
5973 | */ | |
30593241 TM |
5974 | if ((check_secs_byte_order == 1) && |
5975 | ((ec > 255) && ((ec & 0xff) == 0))) { | |
dbd65517 SR |
5976 | ec = (ec >> 8) | (ec << 8); |
5977 | } | |
dbd65517 | 5978 | |
3e985dbf TM |
5979 | if ((state->load_balance_max_secs == 0) || |
5980 | (state->load_balance_max_secs < ec)) { | |
dbd65517 | 5981 | return (1); |
85a53735 TL |
5982 | } |
5983 | ||
007e3ee4 TL |
5984 | /* If we don't have a hash bucket array, we can't tell if this |
5985 | one's ours, so we assume it's not. */ | |
dbd65517 SR |
5986 | if (!state->hba) |
5987 | return (0); | |
007e3ee4 | 5988 | |
dbd65517 SR |
5989 | oc = lookup_option(&dhcp_universe, packet->options, |
5990 | DHO_DHCP_CLIENT_IDENTIFIER); | |
5991 | memset(&ds, 0, sizeof ds); | |
85a53735 | 5992 | if (oc && |
dbd65517 SR |
5993 | evaluate_option_cache(&ds, packet, NULL, NULL, |
5994 | packet->options, NULL, | |
5995 | &global_scope, oc, MDL)) { | |
5996 | hbaix = loadb_p_hash(ds.data, ds.len); | |
95fd7038 DH |
5997 | |
5998 | data_string_forget(&ds, MDL); | |
85a53735 | 5999 | } else { |
dbd65517 SR |
6000 | hbaix = loadb_p_hash(packet->raw->chaddr, |
6001 | packet->raw->hlen); | |
85a53735 | 6002 | } |
0b17f049 DH |
6003 | |
6004 | hm = state->hba[(hbaix >> 3) & 0x1F] & (1 << (hbaix & 0x07)); | |
6005 | ||
dbd65517 SR |
6006 | if (state->i_am == primary) |
6007 | return (hm); | |
85a53735 | 6008 | else |
dbd65517 | 6009 | return (!hm); |
85a53735 | 6010 | } |
20916cae | 6011 | |
2426234f DH |
6012 | /* The inverse of load_balance_mine ("load balance theirs"). We can't |
6013 | * use the regular load_balance_mine() and invert it because of the case | |
6014 | * where there might not be an HBA, and we want to indicate false here | |
6015 | * in this case only. | |
6016 | */ | |
6017 | int | |
6018 | peer_wants_lease(struct lease *lp) | |
6019 | { | |
6020 | dhcp_failover_state_t *state; | |
6021 | unsigned char hbaix; | |
6022 | int hm; | |
6023 | ||
6024 | if (!lp->pool) | |
6025 | return 0; | |
6026 | ||
6027 | state = lp->pool->failover_peer; | |
6028 | ||
6029 | if (!state || !state->hba) | |
6030 | return 0; | |
6031 | ||
6032 | if (lp->uid_len) | |
1418fd11 DH |
6033 | hbaix = loadb_p_hash(lp->uid, lp->uid_len); |
6034 | else if (lp->hardware_addr.hlen > 1) | |
6035 | /* Skip the first byte, which is the hardware type, and is | |
6036 | * not included during actual load balancing checks above | |
6037 | * since it is separate from the packet header chaddr field. | |
6038 | * The remainder of the hardware address should be identical | |
6039 | * to the chaddr contents. | |
6040 | */ | |
6041 | hbaix = loadb_p_hash(lp->hardware_addr.hbuf + 1, | |
6042 | lp->hardware_addr.hlen - 1); | |
edb1283e DH |
6043 | else /* impossible to categorize into LBA */ |
6044 | return 0; | |
2426234f DH |
6045 | |
6046 | hm = state->hba[(hbaix >> 3) & 0x1F] & (1 << (hbaix & 0x07)); | |
6047 | ||
6048 | if (state->i_am == primary) | |
6049 | return !hm; | |
6050 | else | |
6051 | return hm; | |
6052 | } | |
6053 | ||
da292833 | 6054 | /* This deals with what to do with bind updates when |
6ec59010 | 6055 | we're in the normal state |
da292833 TL |
6056 | |
6057 | Note that tsfp had better be set from the latest bind update | |
6058 | _before_ this function is called! */ | |
6059 | ||
6060 | binding_state_t | |
6061 | normal_binding_state_transition_check (struct lease *lease, | |
6062 | dhcp_failover_state_t *state, | |
31bbee78 TL |
6063 | binding_state_t binding_state, |
6064 | u_int32_t tsfp) | |
007e3ee4 | 6065 | { |
da292833 TL |
6066 | binding_state_t new_state; |
6067 | ||
007e3ee4 TL |
6068 | /* If there is no transition, it's no problem. */ |
6069 | if (binding_state == lease -> binding_state) | |
6070 | return binding_state; | |
6071 | ||
007e3ee4 TL |
6072 | switch (lease -> binding_state) { |
6073 | case FTS_FREE: | |
6074 | case FTS_ABANDONED: | |
6075 | switch (binding_state) { | |
6076 | case FTS_ACTIVE: | |
6077 | case FTS_ABANDONED: | |
6078 | case FTS_BACKUP: | |
98311e4b DH |
6079 | case FTS_EXPIRED: |
6080 | case FTS_RELEASED: | |
6081 | case FTS_RESET: | |
007e3ee4 TL |
6082 | /* If the lease was free, and our peer is primary, |
6083 | then it can make it active, or abandoned, or | |
6084 | backup. Abandoned is treated like free in | |
6085 | this case. */ | |
6086 | if (state -> i_am == secondary) | |
6087 | return binding_state; | |
6088 | ||
d758ad8c TL |
6089 | /* Otherwise, it can't legitimately do any sort of |
6090 | state transition. Because the lease was free, | |
6091 | and the error has already been made, we allow the | |
6092 | peer to change its state anyway, but log a warning | |
6093 | message in hopes that the error will be fixed. */ | |
007e3ee4 | 6094 | case FTS_FREE: /* for compiler */ |
d758ad8c | 6095 | new_state = binding_state; |
da292833 | 6096 | goto out; |
98311e4b DH |
6097 | |
6098 | default: | |
6099 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6100 | return FTS_RESET; | |
007e3ee4 TL |
6101 | } |
6102 | case FTS_ACTIVE: | |
007e3ee4 TL |
6103 | /* The secondary can't change the state of an active |
6104 | lease. */ | |
da292833 | 6105 | if (state -> i_am == primary) { |
98311e4b | 6106 | /* Except that the client may send the DHCPRELEASE |
3e3b5257 TM |
6107 | to the secondary. We also allow for when the |
6108 | secondary gets a DECLINE and the primary does not.*/ | |
6109 | if ((binding_state == FTS_RELEASED) || | |
6110 | (binding_state == FTS_ABANDONED)) | |
6111 | return binding_state; | |
6112 | ||
da292833 TL |
6113 | new_state = lease -> binding_state; |
6114 | goto out; | |
6115 | } | |
007e3ee4 TL |
6116 | |
6117 | /* So this is only for transitions made by the primary: */ | |
6118 | switch (binding_state) { | |
6119 | case FTS_FREE: | |
6120 | case FTS_BACKUP: | |
6121 | /* Can't set a lease to free or backup until the | |
6122 | peer agrees that it's expired. */ | |
31bbee78 | 6123 | if (tsfp > cur_time) { |
da292833 TL |
6124 | new_state = lease -> binding_state; |
6125 | goto out; | |
6126 | } | |
007e3ee4 TL |
6127 | return binding_state; |
6128 | ||
6129 | case FTS_EXPIRED: | |
98311e4b DH |
6130 | /* XXX 65 should be the clock skew between the peers |
6131 | XXX plus a fudge factor. This code will result | |
6132 | XXX in problems if MCLT is really short or the | |
6133 | XXX max-lease-time is really short (less than the | |
6134 | XXX fudge factor. */ | |
6135 | if (lease -> ends - 65 > cur_time) { | |
da292833 TL |
6136 | new_state = lease -> binding_state; |
6137 | goto out; | |
6138 | } | |
007e3ee4 | 6139 | |
007e3ee4 TL |
6140 | case FTS_RELEASED: |
6141 | case FTS_ABANDONED: | |
6142 | case FTS_RESET: | |
6143 | case FTS_ACTIVE: | |
6144 | return binding_state; | |
6145 | ||
98311e4b DH |
6146 | default: |
6147 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6148 | return FTS_RESET; | |
007e3ee4 | 6149 | } |
d758ad8c | 6150 | break; |
007e3ee4 TL |
6151 | case FTS_EXPIRED: |
6152 | switch (binding_state) { | |
007e3ee4 | 6153 | case FTS_BACKUP: |
d758ad8c | 6154 | case FTS_FREE: |
007e3ee4 TL |
6155 | /* Can't set a lease to free or backup until the |
6156 | peer agrees that it's expired. */ | |
31bbee78 | 6157 | if (tsfp > cur_time) { |
da292833 TL |
6158 | new_state = lease -> binding_state; |
6159 | goto out; | |
6160 | } | |
007e3ee4 TL |
6161 | return binding_state; |
6162 | ||
007e3ee4 TL |
6163 | case FTS_ACTIVE: |
6164 | case FTS_RELEASED: | |
6165 | case FTS_ABANDONED: | |
6166 | case FTS_RESET: | |
6167 | case FTS_EXPIRED: | |
6168 | return binding_state; | |
98311e4b DH |
6169 | |
6170 | default: | |
6171 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6172 | return FTS_RESET; | |
007e3ee4 TL |
6173 | } |
6174 | case FTS_RELEASED: | |
6175 | switch (binding_state) { | |
6176 | case FTS_FREE: | |
6177 | case FTS_BACKUP: | |
007e3ee4 | 6178 | |
a609e69b TL |
6179 | /* These are invalid state transitions - should we |
6180 | prevent them? */ | |
007e3ee4 TL |
6181 | case FTS_EXPIRED: |
6182 | case FTS_ABANDONED: | |
6183 | case FTS_RESET: | |
6184 | case FTS_ACTIVE: | |
6185 | case FTS_RELEASED: | |
6186 | return binding_state; | |
98311e4b DH |
6187 | |
6188 | default: | |
6189 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6190 | return FTS_RESET; | |
007e3ee4 TL |
6191 | } |
6192 | case FTS_RESET: | |
6193 | switch (binding_state) { | |
6194 | case FTS_FREE: | |
6195 | case FTS_BACKUP: | |
6196 | /* Can't set a lease to free or backup until the | |
6197 | peer agrees that it's expired. */ | |
31bbee78 | 6198 | if (tsfp > cur_time) { |
da292833 TL |
6199 | new_state = lease -> binding_state; |
6200 | goto out; | |
6201 | } | |
007e3ee4 TL |
6202 | return binding_state; |
6203 | ||
6204 | case FTS_ACTIVE: | |
007e3ee4 TL |
6205 | case FTS_EXPIRED: |
6206 | case FTS_RELEASED: | |
6207 | case FTS_ABANDONED: | |
6208 | case FTS_RESET: | |
6209 | return binding_state; | |
98311e4b DH |
6210 | |
6211 | default: | |
6212 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6213 | return FTS_RESET; | |
007e3ee4 TL |
6214 | } |
6215 | case FTS_BACKUP: | |
6216 | switch (binding_state) { | |
6217 | case FTS_ACTIVE: | |
6218 | case FTS_ABANDONED: | |
007e3ee4 TL |
6219 | case FTS_EXPIRED: |
6220 | case FTS_RELEASED: | |
6221 | case FTS_RESET: | |
98311e4b DH |
6222 | /* If the lease was in backup, and our peer |
6223 | is secondary, then it can make it active | |
6224 | or abandoned. */ | |
6225 | if (state -> i_am == primary) | |
6226 | return binding_state; | |
6227 | ||
6228 | /* Either the primary or the secondary can | |
6229 | reasonably move a lease from the backup | |
6230 | state to the free state. */ | |
6231 | case FTS_FREE: | |
6232 | return binding_state; | |
007e3ee4 TL |
6233 | |
6234 | case FTS_BACKUP: | |
da292833 TL |
6235 | new_state = lease -> binding_state; |
6236 | goto out; | |
98311e4b DH |
6237 | |
6238 | default: | |
6239 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6240 | return FTS_RESET; | |
da292833 | 6241 | } |
98311e4b DH |
6242 | |
6243 | default: | |
6244 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6245 | return FTS_RESET; | |
da292833 TL |
6246 | } |
6247 | out: | |
6248 | return new_state; | |
6249 | } | |
6250 | ||
6251 | /* Determine whether the state transition is okay when we're potentially | |
6252 | in conflict with the peer. */ | |
6253 | binding_state_t | |
6254 | conflict_binding_state_transition_check (struct lease *lease, | |
6255 | dhcp_failover_state_t *state, | |
31bbee78 TL |
6256 | binding_state_t binding_state, |
6257 | u_int32_t tsfp) | |
da292833 TL |
6258 | { |
6259 | binding_state_t new_state; | |
6260 | ||
6261 | /* If there is no transition, it's no problem. */ | |
6262 | if (binding_state == lease -> binding_state) | |
6263 | new_state = binding_state; | |
6264 | else { | |
6265 | switch (lease -> binding_state) { | |
6266 | /* If we think the lease is not in use, then the | |
6267 | state into which the partner put it is just fine, | |
6268 | whatever it is. */ | |
6269 | case FTS_FREE: | |
6270 | case FTS_ABANDONED: | |
6271 | case FTS_EXPIRED: | |
6272 | case FTS_RELEASED: | |
6273 | case FTS_RESET: | |
6274 | case FTS_BACKUP: | |
6275 | new_state = binding_state; | |
6276 | break; | |
6277 | ||
6278 | /* If we think the lease *is* in use, then we're not | |
6279 | going to take the partner's change if the partner | |
6280 | thinks it's free. */ | |
6281 | case FTS_ACTIVE: | |
da292833 TL |
6282 | switch (binding_state) { |
6283 | case FTS_FREE: | |
6284 | case FTS_BACKUP: | |
da292833 TL |
6285 | new_state = lease -> binding_state; |
6286 | break; | |
6287 | ||
6288 | case FTS_EXPIRED: | |
88cd8aca DH |
6289 | /* If we don't agree about expiry, it's |
6290 | * invalid. 65 should allow for max | |
6291 | * clock skew (60) plus some fudge. | |
6292 | * XXX: should we refetch cur_time? | |
6293 | */ | |
6294 | if ((lease->ends - 65) > cur_time) | |
6295 | new_state = lease->binding_state; | |
da292833 TL |
6296 | else |
6297 | new_state = binding_state; | |
6298 | break; | |
6299 | ||
88cd8aca DH |
6300 | /* RELEASED, RESET, and ABANDONED indicate |
6301 | * that our partner has information about | |
6302 | * this lease that we did not witness. Our | |
6303 | * partner wins. | |
6304 | */ | |
6305 | case FTS_RELEASED: | |
6306 | case FTS_RESET: | |
6307 | case FTS_ABANDONED: | |
da292833 TL |
6308 | new_state = binding_state; |
6309 | break; | |
98311e4b DH |
6310 | |
6311 | default: | |
6312 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6313 | return FTS_RESET; | |
da292833 TL |
6314 | } |
6315 | break; | |
98311e4b DH |
6316 | |
6317 | default: | |
6318 | log_fatal ("Impossible case at %s:%d.", MDL); | |
6319 | return FTS_RESET; | |
007e3ee4 TL |
6320 | } |
6321 | } | |
da292833 | 6322 | return new_state; |
007e3ee4 TL |
6323 | } |
6324 | ||
5f0c7be1 TL |
6325 | /* We can reallocate a lease under the following circumstances: |
6326 | ||
6327 | (1) It belongs to us - it's FTS_FREE, and we're primary, or it's | |
6328 | FTS_BACKUP, and we're secondary. | |
6329 | (2) We're in partner_down, and the lease is not active, and we | |
6330 | can be sure that the other server didn't make it active. | |
6331 | We can only be sure that the server didn't make it active | |
6332 | when we are in the partner_down state and one of the following | |
6333 | two conditions holds: | |
6334 | (a) in the case that the time sent from the peer is earlier than | |
6335 | the time we entered the partner_down state, at least MCLT has | |
6336 | gone by since we entered partner_down, or | |
6337 | (b) in the case that the time sent from the peer is later than | |
6338 | the time when we entered partner_down, the current time is | |
6339 | later than the time sent from the peer by at least MCLT. */ | |
6340 | ||
6341 | int lease_mine_to_reallocate (struct lease *lease) | |
007e3ee4 TL |
6342 | { |
6343 | dhcp_failover_state_t *peer; | |
6344 | ||
88cd8aca DH |
6345 | if (lease && lease->pool && |
6346 | (peer = lease->pool->failover_peer)) { | |
fdfebedf DH |
6347 | /* |
6348 | * In addition to the normal rules governing wether a server | |
6349 | * is allowed to operate changes on a lease, the server is | |
6350 | * allowed to operate on a lease from the standpoint of the | |
6351 | * most conservative guess of the peer's state for this lease. | |
6352 | */ | |
88cd8aca | 6353 | switch (lease->binding_state) { |
5f0c7be1 | 6354 | case FTS_ACTIVE: |
88cd8aca | 6355 | /* ACTIVE leases may not be reallocated. */ |
5f0c7be1 TL |
6356 | return 0; |
6357 | ||
6358 | case FTS_FREE: | |
88cd8aca DH |
6359 | case FTS_ABANDONED: |
6360 | /* FREE leases may only be allocated by the primary, | |
6361 | * unless the secondary is acting in partner_down | |
6362 | * state and stos+mclt or tsfp+mclt has expired, | |
6363 | * whichever is greater. | |
6364 | * | |
6365 | * ABANDONED are treated the same as FREE for all | |
6366 | * purposes here. Note that servers will only try | |
6367 | * for ABANDONED leases as a last resort anyway. | |
6368 | */ | |
5f0c7be1 TL |
6369 | if (peer -> i_am == primary) |
6370 | return 1; | |
5f0c7be1 | 6371 | |
88cd8aca DH |
6372 | return(peer->service_state == service_partner_down && |
6373 | ((lease->tsfp < peer->me.stos) ? | |
6374 | (peer->me.stos + peer->mclt < cur_time) : | |
6375 | (lease->tsfp + peer->mclt < cur_time))); | |
6376 | ||
5f0c7be1 TL |
6377 | case FTS_RELEASED: |
6378 | case FTS_EXPIRED: | |
fdfebedf DH |
6379 | /* |
6380 | * These leases are generally untouchable until the | |
6381 | * peer acknowledges their state change. However, as | |
6382 | * this is impossible if the peer is offline, the | |
6383 | * failover protocol permits an 'optimization' to | |
6384 | * rewind the lease to a previous state that the server | |
6385 | * is allowed to operate on, if that was the state that | |
6386 | * was last acknowledged by the peer. | |
6387 | * | |
6388 | * So if a lease was free, was allocated by this | |
6389 | * server, and expired without ever being transmitted | |
6390 | * to the peer, it can be returned to free and given | |
6391 | * to any new client legally. | |
6392 | */ | |
6393 | if ((peer->i_am == primary) && | |
6394 | (lease->rewind_binding_state == FTS_FREE)) | |
6395 | return 1; | |
6396 | if ((peer->i_am == secondary) && | |
6397 | (lease->rewind_binding_state == FTS_BACKUP)) | |
6398 | return 1; | |
6399 | ||
6400 | /* FALL THROUGH (released, expired, reset) */ | |
6401 | case FTS_RESET: | |
6402 | /* | |
6403 | * Released, expired, and reset leases go onto the | |
6404 | * 'expired' queue all together. Upon entry into | |
6405 | * partner-down state, this queue of leases has their | |
6406 | * tsfp values modified to equal stos+mclt, the point | |
6407 | * at which the server is allowed to remove them from | |
6408 | * these transitional states. | |
88cd8aca DH |
6409 | * |
6410 | * Note that although tsfp has been possibly extended | |
6411 | * past the actual tsfp we received from the peer, we | |
6412 | * don't have to take any special action. Since tsfp | |
fdfebedf DH |
6413 | * will be equal to the current time when the lease |
6414 | * transitions to free, tsfp will not be used to grant | |
6415 | * lease-times longer than the MCLT to clients, which | |
6416 | * is the only danger for this sort of modification. | |
88cd8aca DH |
6417 | */ |
6418 | return((peer->service_state == service_partner_down) && | |
6419 | (lease->tsfp < cur_time)); | |
6420 | ||
5f0c7be1 | 6421 | case FTS_BACKUP: |
88cd8aca DH |
6422 | /* Only the secondary may allocate BACKUP leases, |
6423 | * unless in partner_down state in which case at | |
6424 | * least TSFP+MCLT or STOS+MCLT must have expired, | |
6425 | * whichever is greater. | |
6426 | */ | |
6427 | if (peer->i_am == secondary) | |
5f0c7be1 | 6428 | return 1; |
88cd8aca DH |
6429 | |
6430 | return((peer->service_state == service_partner_down) && | |
6431 | ((lease->tsfp < peer->me.stos) ? | |
6432 | (peer->me.stos + peer->mclt < cur_time) : | |
6433 | (lease->tsfp + peer->mclt < cur_time))); | |
6434 | ||
6435 | default: | |
6436 | /* All lease states appear above. */ | |
6437 | log_fatal("Impossible case at %s:%d.", MDL); | |
6438 | break; | |
007e3ee4 | 6439 | } |
5f0c7be1 | 6440 | return 0; |
007e3ee4 | 6441 | } |
d588b01f | 6442 | if (lease) |
88cd8aca DH |
6443 | return(lease->binding_state == FTS_FREE || |
6444 | lease->binding_state == FTS_BACKUP); | |
d588b01f TL |
6445 | else |
6446 | return 0; | |
007e3ee4 TL |
6447 | } |
6448 | ||
988c1ca7 DN |
6449 | static isc_result_t failover_message_reference (failover_message_t **mp, |
6450 | failover_message_t *m, | |
6451 | const char *file, int line) | |
6452 | { | |
6453 | *mp = m; | |
6454 | m -> refcnt++; | |
6455 | return ISC_R_SUCCESS; | |
6456 | } | |
6457 | ||
6458 | static isc_result_t failover_message_dereference (failover_message_t **mp, | |
6459 | const char *file, int line) | |
6460 | { | |
d758ad8c TL |
6461 | failover_message_t *m; |
6462 | m = (*mp); | |
6463 | m -> refcnt--; | |
6464 | if (m -> refcnt == 0) { | |
6465 | if (m -> next) | |
6466 | failover_message_dereference (&m -> next, | |
6467 | file, line); | |
6468 | if (m -> chaddr.data) | |
6469 | dfree (m -> chaddr.data, file, line); | |
6470 | if (m -> client_identifier.data) | |
6471 | dfree (m -> client_identifier.data, file, line); | |
6472 | if (m -> hba.data) | |
6473 | dfree (m -> hba.data, file, line); | |
6474 | if (m -> message.data) | |
6475 | dfree (m -> message.data, file, line); | |
30e42327 SR |
6476 | if (m -> relationship_name.data) |
6477 | dfree (m -> relationship_name.data, file, line); | |
d758ad8c TL |
6478 | if (m -> reply_options.data) |
6479 | dfree (m -> reply_options.data, file, line); | |
6480 | if (m -> request_options.data) | |
6481 | dfree (m -> request_options.data, file, line); | |
6482 | if (m -> vendor_class.data) | |
6483 | dfree (m -> vendor_class.data, file, line); | |
6484 | if (m -> vendor_options.data) | |
6485 | dfree (m -> vendor_options.data, file, line); | |
6486 | if (m -> ddns.data) | |
6487 | dfree (m -> ddns.data, file, line); | |
6488 | dfree (*mp, file, line); | |
988c1ca7 | 6489 | } |
fa0b4709 | 6490 | *mp = 0; |
988c1ca7 DN |
6491 | return ISC_R_SUCCESS; |
6492 | } | |
6493 | ||
20916cae TL |
6494 | OMAPI_OBJECT_ALLOC (dhcp_failover_state, dhcp_failover_state_t, |
6495 | dhcp_type_failover_state) | |
6496 | OMAPI_OBJECT_ALLOC (dhcp_failover_listener, dhcp_failover_listener_t, | |
6497 | dhcp_type_failover_listener) | |
6498 | OMAPI_OBJECT_ALLOC (dhcp_failover_link, dhcp_failover_link_t, | |
6499 | dhcp_type_failover_link) | |
c68d2a87 | 6500 | #endif /* defined (FAILOVER_PROTOCOL) */ |
da292833 | 6501 | |
da292833 TL |
6502 | const char *binding_state_print (enum failover_state state) |
6503 | { | |
6504 | switch (state) { | |
6505 | case FTS_FREE: | |
6506 | return "free"; | |
6507 | break; | |
6508 | ||
6509 | case FTS_ACTIVE: | |
6510 | return "active"; | |
6511 | break; | |
6512 | ||
6513 | case FTS_EXPIRED: | |
6514 | return "expired"; | |
6515 | break; | |
6516 | ||
6517 | case FTS_RELEASED: | |
6518 | return "released"; | |
6519 | break; | |
6520 | ||
6521 | case FTS_ABANDONED: | |
6522 | return "abandoned"; | |
6523 | break; | |
6524 | ||
6525 | case FTS_RESET: | |
6526 | return "reset"; | |
6527 | break; | |
6528 | ||
6529 | case FTS_BACKUP: | |
6530 | return "backup"; | |
6531 | break; | |
6532 | ||
da292833 TL |
6533 | default: |
6534 | return "unknown"; | |
6535 | break; | |
6536 | } | |
6537 | } | |
09dccd03 TM |
6538 | |
6539 | ||
6540 | /*! | |
6541 | * \brief Given a char pointer, return always return a printable value | |
6542 | * | |
6543 | * This function is intended to be used in within log statements, such that | |
6544 | * its invocation only occurs if the logging level is enabled. | |
6545 | * | |
6546 | * \param value pointer the character to print | |
6547 | * | |
6548 | * \return If value is null, returns the string "<none>", if it contains | |
6549 | * non-printable bytes, returns the string "<unsuitable for printing>", | |
6550 | * otherwise it returns a const pointer to value | |
6551 | */ | |
6552 | const char *printable(const char* value) { | |
6553 | const char *print_value = "<none>"; | |
6554 | if (value) { | |
6555 | if ((strlen (value) <= 64) && | |
6556 | db_printable((unsigned char*)value)) { | |
6557 | print_value = value; | |
6558 | } | |
6559 | else { | |
6560 | print_value = "<unsuitable for printing>"; | |
6561 | } | |
6562 | } | |
6563 | ||
6564 | return (print_value); | |
6565 | } | |
6566 | ||
6567 | /*! | |
6568 | * \brief Remove information from a prior use of a lease | |
6569 | * | |
6570 | * Remove information from a lease that is not germain to lease affinity | |
6571 | * | |
6572 | * \param lease the lease to scrub | |
6573 | */ | |
6574 | void scrub_lease(struct lease* lease, const char *file, int line) { | |
6575 | log_debug ("%s(%d):scrubbing lease for %s, hostname: %s", file, line, | |
6576 | piaddr(lease->ip_addr), printable(lease->client_hostname)); | |
6577 | ||
6578 | if (lease->client_hostname) { | |
6579 | dfree (lease->client_hostname, MDL); | |
6580 | lease->client_hostname = (char *)0; | |
6581 | } | |
6582 | } |