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Commit | Line | Data |
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b992d7e2 DN |
1 | /* ddns.c |
2 | ||
3 | Dynamic DNS updates. */ | |
4 | ||
5 | /* | |
2b58b865 | 6 | * |
60bba434 | 7 | * Copyright (c) 2009-2016 by Internet Systems Consortium, Inc. ("ISC") |
2b58b865 | 8 | * Copyright (c) 2004-2007 by Internet Systems Consortium, Inc. ("ISC") |
98311e4b | 9 | * Copyright (c) 2000-2003 by Internet Software Consortium |
b992d7e2 | 10 | * |
98311e4b DH |
11 | * Permission to use, copy, modify, and distribute this software for any |
12 | * purpose with or without fee is hereby granted, provided that the above | |
13 | * copyright notice and this permission notice appear in all copies. | |
b992d7e2 | 14 | * |
98311e4b DH |
15 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
16 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
17 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR | |
18 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
19 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
20 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
21 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
b992d7e2 | 22 | * |
98311e4b DH |
23 | * Internet Systems Consortium, Inc. |
24 | * 950 Charter Street | |
25 | * Redwood City, CA 94063 | |
26 | * <info@isc.org> | |
2c85ac9b | 27 | * https://www.isc.org/ |
b992d7e2 | 28 | * |
98311e4b | 29 | * This software has been donated to Internet Systems Consortium |
0598e123 TL |
30 | * by Damien Neil of Nominum, Inc. |
31 | * | |
98311e4b | 32 | * To learn more about Internet Systems Consortium, see |
60bba434 | 33 | * ``https://www.isc.org/''. |
b992d7e2 DN |
34 | */ |
35 | ||
b992d7e2 | 36 | #include "dhcpd.h" |
98bf1607 | 37 | #include <dns/result.h> |
b992d7e2 | 38 | |
d7d9c0c7 SR |
39 | char *ddns_standard_tag = "ddns-dhcid"; |
40 | char *ddns_interim_tag = "ddns-txt"; | |
41 | ||
b992d7e2 DN |
42 | #ifdef NSUPDATE |
43 | ||
98bf1607 SR |
44 | static void ddns_fwd_srv_connector(struct lease *lease, |
45 | struct iasubopt *lease6, | |
46 | struct binding_scope **inscope, | |
47 | dhcp_ddns_cb_t *ddns_cb, | |
48 | isc_result_t eresult); | |
49 | ||
0598e123 TL |
50 | /* DN: No way of checking that there is enough space in a data_string's |
51 | buffer. Be certain to allocate enough! | |
385fcb27 | 52 | TL: This is why the expression evaluation code allocates a *new* |
0598e123 | 53 | data_string. :') */ |
b992d7e2 DN |
54 | static void data_string_append (struct data_string *ds1, |
55 | struct data_string *ds2) | |
56 | { | |
57 | memcpy (ds1 -> buffer -> data + ds1 -> len, | |
58 | ds2 -> data, | |
59 | ds2 -> len); | |
60 | ds1 -> len += ds2 -> len; | |
61 | } | |
62 | ||
b992d7e2 | 63 | |
98bd7ca0 DH |
64 | /* Determine what, if any, forward and reverse updates need to be |
65 | * performed, and carry them through. | |
66 | */ | |
67 | int | |
68 | ddns_updates(struct packet *packet, struct lease *lease, struct lease *old, | |
1d17db44 | 69 | struct iasubopt *lease6, struct iasubopt *old6, |
98bd7ca0 | 70 | struct option_state *options) |
b992d7e2 DN |
71 | { |
72 | unsigned long ddns_ttl = DEFAULT_DDNS_TTL; | |
73 | struct data_string ddns_hostname; | |
74 | struct data_string ddns_domainname; | |
478028e7 | 75 | struct data_string old_ddns_fwd_name; |
b992d7e2 | 76 | struct data_string ddns_fwd_name; |
b992d7e2 | 77 | struct data_string ddns_dhcid; |
98bf1607 | 78 | struct binding_scope **scope = NULL; |
b992d7e2 DN |
79 | struct data_string d1; |
80 | struct option_cache *oc; | |
81 | int s1, s2; | |
82 | int result = 0; | |
478028e7 TL |
83 | int server_updates_a = 1; |
84 | struct buffer *bp = (struct buffer *)0; | |
a396d25f | 85 | int ignorep = 0, client_ignorep = 0; |
98bd7ca0 DH |
86 | int rev_name_len; |
87 | int i; | |
b992d7e2 | 88 | |
98bf1607 SR |
89 | dhcp_ddns_cb_t *ddns_cb; |
90 | int do_remove = 0; | |
91 | ||
d7d9c0c7 SR |
92 | if ((ddns_update_style != DDNS_UPDATE_STYLE_STANDARD) && |
93 | (ddns_update_style != DDNS_UPDATE_STYLE_INTERIM)) | |
94 | return (0); | |
5fac73d6 | 95 | |
98bf1607 SR |
96 | /* |
97 | * sigh, I want to cancel any previous udpates before we do anything | |
98 | * else but this means we need to deal with the lease vs lease6 | |
99 | * question twice. | |
100 | * If there is a ddns request already outstanding cancel it. | |
101 | */ | |
102 | ||
98bd7ca0 | 103 | if (lease != NULL) { |
98bf1607 | 104 | if ((old != NULL) && (old->ddns_cb != NULL)) { |
87132514 | 105 | ddns_cancel(old->ddns_cb, MDL); |
98bf1607 SR |
106 | old->ddns_cb = NULL; |
107 | } | |
98bd7ca0 | 108 | } else if (lease6 != NULL) { |
98bf1607 | 109 | if ((old6 != NULL) && (old6->ddns_cb != NULL)) { |
87132514 | 110 | ddns_cancel(old6->ddns_cb, MDL); |
98bf1607 SR |
111 | old6->ddns_cb = NULL; |
112 | } | |
6705543f | 113 | } else { |
98bd7ca0 | 114 | log_fatal("Impossible condition at %s:%d.", MDL); |
6705543f | 115 | /* Silence compiler warnings. */ |
98bf1607 SR |
116 | result = 0; |
117 | return(0); | |
118 | } | |
119 | ||
120 | /* allocate our control block */ | |
121 | ddns_cb = ddns_cb_alloc(MDL); | |
122 | if (ddns_cb == NULL) { | |
123 | return(0); | |
124 | } | |
0ef9a46e SR |
125 | /* |
126 | * Assume that we shall update both the A and ptr records and, | |
127 | * as this is an update, set the active flag | |
128 | */ | |
129 | ddns_cb->flags = DDNS_UPDATE_ADDR | DDNS_UPDATE_PTR | | |
130 | DDNS_ACTIVE_LEASE; | |
3221151b SR |
131 | |
132 | /* | |
133 | * For v4 we flag static leases so we don't try | |
134 | * and manipulate the lease later. For v6 we don't | |
135 | * get static leases and don't need to flag them. | |
136 | */ | |
98bf1607 SR |
137 | if (lease != NULL) { |
138 | scope = &(lease->scope); | |
139 | ddns_cb->address = lease->ip_addr; | |
3221151b SR |
140 | if (lease->flags & STATIC_LEASE) |
141 | ddns_cb->flags |= DDNS_STATIC_LEASE; | |
98bf1607 SR |
142 | } else if (lease6 != NULL) { |
143 | scope = &(lease6->scope); | |
144 | memcpy(ddns_cb->address.iabuf, lease6->addr.s6_addr, 16); | |
145 | ddns_cb->address.len = 16; | |
6705543f | 146 | } |
b992d7e2 | 147 | |
98bf1607 | 148 | memset (&d1, 0, sizeof(d1)); |
b992d7e2 DN |
149 | memset (&ddns_hostname, 0, sizeof (ddns_hostname)); |
150 | memset (&ddns_domainname, 0, sizeof (ddns_domainname)); | |
478028e7 | 151 | memset (&old_ddns_fwd_name, 0, sizeof (ddns_fwd_name)); |
b992d7e2 | 152 | memset (&ddns_fwd_name, 0, sizeof (ddns_fwd_name)); |
b992d7e2 DN |
153 | memset (&ddns_dhcid, 0, sizeof (ddns_dhcid)); |
154 | ||
478028e7 TL |
155 | /* If we are allowed to accept the client's update of its own A |
156 | record, see if the client wants to update its own A record. */ | |
98bd7ca0 | 157 | if (!(oc = lookup_option(&server_universe, options, |
a396d25f DH |
158 | SV_CLIENT_UPDATES)) || |
159 | evaluate_boolean_option_cache(&client_ignorep, packet, lease, NULL, | |
98bd7ca0 DH |
160 | packet->options, options, scope, |
161 | oc, MDL)) { | |
478028e7 TL |
162 | /* If there's no fqdn.no-client-update or if it's |
163 | nonzero, don't try to use the client-supplied | |
164 | XXX */ | |
ee83afae | 165 | if (!(oc = lookup_option (&fqdn_universe, packet -> options, |
98311e4b | 166 | FQDN_SERVER_UPDATE)) || |
98bd7ca0 DH |
167 | evaluate_boolean_option_cache(&ignorep, packet, lease, |
168 | NULL, packet->options, | |
169 | options, scope, oc, MDL)) | |
478028e7 | 170 | goto noclient; |
e9d45f83 TL |
171 | /* Win98 and Win2k will happily claim to be willing to |
172 | update an unqualified domain name. */ | |
173 | if (!(oc = lookup_option (&fqdn_universe, packet -> options, | |
174 | FQDN_DOMAINNAME))) | |
175 | goto noclient; | |
ee83afae | 176 | if (!(oc = lookup_option (&fqdn_universe, packet -> options, |
478028e7 | 177 | FQDN_FQDN)) || |
98bd7ca0 DH |
178 | !evaluate_option_cache(&ddns_fwd_name, packet, lease, |
179 | NULL, packet->options, | |
180 | options, scope, oc, MDL)) | |
478028e7 | 181 | goto noclient; |
98bf1607 | 182 | ddns_cb->flags &= ~DDNS_UPDATE_ADDR; |
478028e7 TL |
183 | server_updates_a = 0; |
184 | goto client_updates; | |
b992d7e2 | 185 | } |
478028e7 | 186 | noclient: |
98311e4b DH |
187 | /* If do-forward-updates is disabled, this basically means don't |
188 | do an update unless the client is participating, so if we get | |
189 | here and do-forward-updates is disabled, we can stop. */ | |
98bd7ca0 | 190 | if ((oc = lookup_option (&server_universe, options, |
98311e4b | 191 | SV_DO_FORWARD_UPDATES)) && |
98bd7ca0 DH |
192 | !evaluate_boolean_option_cache(&ignorep, packet, lease, |
193 | NULL, packet->options, | |
194 | options, scope, oc, MDL)) { | |
98bf1607 | 195 | goto out; |
98311e4b | 196 | } |
b992d7e2 | 197 | |
ec64b462 TL |
198 | /* If it's a static lease, then don't do the DNS update unless we're |
199 | specifically configured to do so. If the client asked to do its | |
200 | own update and we allowed that, we don't do this test. */ | |
98bd7ca0 DH |
201 | /* XXX: note that we cannot detect static DHCPv6 leases. */ |
202 | if ((lease != NULL) && (lease->flags & STATIC_LEASE)) { | |
203 | if (!(oc = lookup_option(&server_universe, options, | |
204 | SV_UPDATE_STATIC_LEASES)) || | |
205 | !evaluate_boolean_option_cache(&ignorep, packet, lease, | |
206 | NULL, packet->options, | |
207 | options, scope, oc, MDL)) | |
98bf1607 | 208 | goto out; |
ec64b462 TL |
209 | } |
210 | ||
b992d7e2 | 211 | /* |
478028e7 | 212 | * Compute the name for the A record. |
b992d7e2 | 213 | */ |
98bd7ca0 | 214 | oc = lookup_option(&server_universe, options, SV_DDNS_HOST_NAME); |
b992d7e2 | 215 | if (oc) |
98bd7ca0 DH |
216 | s1 = evaluate_option_cache(&ddns_hostname, packet, lease, |
217 | NULL, packet->options, | |
218 | options, scope, oc, MDL); | |
98311e4b DH |
219 | else |
220 | s1 = 0; | |
b992d7e2 | 221 | |
d9b2a590 TM |
222 | /* If we don't have a host name based on ddns-hostname then use |
223 | * the host declaration name if there is one and use-host-decl-names | |
224 | * is turned on. */ | |
225 | if ((s1 == 0) && (lease && lease->host && lease->host->name)) { | |
226 | oc = lookup_option(&server_universe, options, | |
227 | SV_USE_HOST_DECL_NAMES); | |
228 | if (evaluate_boolean_option_cache(NULL, packet, lease, | |
229 | NULL, packet->options, | |
230 | options, scope, oc, MDL)) { | |
231 | s1 = ((data_string_new(&ddns_hostname, | |
232 | lease->host->name, | |
233 | strlen(lease->host->name), | |
234 | MDL) && ddns_hostname.len > 0)); | |
235 | } | |
236 | } | |
237 | ||
98bd7ca0 | 238 | oc = lookup_option(&server_universe, options, SV_DDNS_DOMAIN_NAME); |
b992d7e2 | 239 | if (oc) |
98bd7ca0 DH |
240 | s2 = evaluate_option_cache(&ddns_domainname, packet, lease, |
241 | NULL, packet->options, | |
242 | options, scope, oc, MDL); | |
98311e4b DH |
243 | else |
244 | s2 = 0; | |
b992d7e2 DN |
245 | |
246 | if (s1 && s2) { | |
98311e4b DH |
247 | if (ddns_hostname.len + ddns_domainname.len > 253) { |
248 | log_error ("ddns_update: host.domain name too long"); | |
249 | ||
250 | goto out; | |
251 | } | |
252 | ||
a07d99bb TM |
253 | if (buffer_allocate (&ddns_fwd_name.buffer, |
254 | ddns_hostname.len + | |
255 | ddns_domainname.len + 2, MDL)) { | |
98bf1607 | 256 | ddns_fwd_name.data = ddns_fwd_name.buffer->data; |
b992d7e2 | 257 | data_string_append (&ddns_fwd_name, &ddns_hostname); |
98bf1607 | 258 | ddns_fwd_name.buffer->data[ddns_fwd_name.len] = '.'; |
b992d7e2 DN |
259 | ddns_fwd_name.len++; |
260 | data_string_append (&ddns_fwd_name, &ddns_domainname); | |
98bf1607 | 261 | ddns_fwd_name.buffer->data[ddns_fwd_name.len] ='\0'; |
b992d7e2 DN |
262 | ddns_fwd_name.terminated = 1; |
263 | } | |
264 | } | |
478028e7 TL |
265 | client_updates: |
266 | ||
267 | /* See if there's a name already stored on the lease. */ | |
98bd7ca0 | 268 | if (find_bound_string(&old_ddns_fwd_name, *scope, "ddns-fwd-name")) { |
478028e7 TL |
269 | /* If there is, see if it's different. */ |
270 | if (old_ddns_fwd_name.len != ddns_fwd_name.len || | |
271 | memcmp (old_ddns_fwd_name.data, ddns_fwd_name.data, | |
272 | old_ddns_fwd_name.len)) { | |
98bf1607 SR |
273 | /* |
274 | * If the name is different, mark the old record | |
275 | * for deletion and continue getting the new info. | |
276 | */ | |
277 | do_remove = 1; | |
478028e7 TL |
278 | goto in; |
279 | } | |
280 | ||
d7d9c0c7 SR |
281 | #if defined (DDNS_UPDATE_SLOW_TRANSITION) |
282 | /* | |
283 | * If the slow transition code is enabled check to see | |
284 | * if the stored type (standard or interim doesn't | |
285 | * match the type currently in use. If it doesn't | |
286 | * try to remove and replace the DNS record | |
98bd7ca0 | 287 | */ |
d7d9c0c7 SR |
288 | if (((ddns_update_style == DDNS_UPDATE_STYLE_STANDARD) && |
289 | find_bound_string(&ddns_dhcid, *scope, ddns_interim_tag)) || | |
290 | ((ddns_update_style == DDNS_UPDATE_STYLE_INTERIM) && | |
291 | find_bound_string(&ddns_dhcid, *scope, ddns_standard_tag))) { | |
75ab3070 | 292 | data_string_forget(&ddns_dhcid, MDL); |
d7d9c0c7 SR |
293 | do_remove = 1; |
294 | goto in; | |
295 | } | |
296 | #endif | |
297 | ||
ebd0310b TL |
298 | /* See if the administrator wants to do updates even |
299 | in cases where the update already appears to have been | |
300 | done. */ | |
98bd7ca0 DH |
301 | if (!(oc = lookup_option(&server_universe, options, |
302 | SV_UPDATE_OPTIMIZATION)) || | |
303 | evaluate_boolean_option_cache(&ignorep, packet, lease, | |
304 | NULL, packet->options, | |
305 | options, scope, oc, MDL)) { | |
ebd0310b TL |
306 | result = 1; |
307 | goto noerror; | |
308 | } | |
75ab3070 DH |
309 | /* If there's no "ddns-fwd-name" on the lease record, see if |
310 | * there's a ddns-client-fqdn indicating a previous client | |
311 | * update (if it changes, we need to adjust the PTR). | |
312 | */ | |
98bd7ca0 | 313 | } else if (find_bound_string(&old_ddns_fwd_name, *scope, |
75ab3070 | 314 | "ddns-client-fqdn")) { |
98311e4b DH |
315 | /* If the name is not different, no need to update |
316 | the PTR record. */ | |
ee83afae TL |
317 | if (old_ddns_fwd_name.len == ddns_fwd_name.len && |
318 | !memcmp (old_ddns_fwd_name.data, ddns_fwd_name.data, | |
98311e4b | 319 | old_ddns_fwd_name.len) && |
98bd7ca0 DH |
320 | (!(oc = lookup_option(&server_universe, options, |
321 | SV_UPDATE_OPTIMIZATION)) || | |
322 | evaluate_boolean_option_cache(&ignorep, packet, lease, | |
323 | NULL, packet->options, | |
324 | options, scope, oc, MDL))) { | |
478028e7 TL |
325 | goto noerror; |
326 | } | |
327 | } | |
328 | in: | |
329 | ||
d758ad8c TL |
330 | /* If we don't have a name that the client has been assigned, we |
331 | can just skip all this. */ | |
d758ad8c | 332 | |
98bf1607 SR |
333 | if ((!ddns_fwd_name.len) || (ddns_fwd_name.len > 255)) { |
334 | if (ddns_fwd_name.len > 255) { | |
335 | log_error ("client provided fqdn: too long"); | |
336 | } | |
337 | ||
338 | /* If desired do the removals */ | |
339 | if (do_remove != 0) { | |
0ef9a46e | 340 | (void) ddns_removals(lease, lease6, NULL, ISC_TRUE); |
98bf1607 | 341 | } |
98311e4b DH |
342 | goto out; |
343 | } | |
344 | ||
b992d7e2 | 345 | /* |
478028e7 | 346 | * Compute the RR TTL. |
2b58b865 SR |
347 | * |
348 | * We have two ways of computing the TTL. | |
349 | * The old behavior was to allow for the customer to set up | |
350 | * the option or to default things. For v4 this was 1/2 | |
351 | * of the lease time, for v6 this was DEFAULT_DDNS_TTL. | |
352 | * The new behavior continues to allow the customer to set | |
353 | * up an option but the defaults are a little different. | |
354 | * We now use 1/2 of the (preferred) lease time for both | |
355 | * v4 and v6 and cap them at a maximum value. | |
356 | * If the customer chooses to use an experession that references | |
357 | * part of the lease the v6 value will be the default as there | |
358 | * isn't a lease available for v6. | |
478028e7 | 359 | */ |
2b58b865 | 360 | |
478028e7 | 361 | ddns_ttl = DEFAULT_DDNS_TTL; |
2b58b865 SR |
362 | if (lease != NULL) { |
363 | if (lease->ends <= cur_time) { | |
364 | ddns_ttl = 0; | |
365 | } else { | |
366 | ddns_ttl = (lease->ends - cur_time)/2; | |
367 | } | |
368 | } | |
369 | #ifndef USE_OLD_DDNS_TTL | |
370 | else if (lease6 != NULL) { | |
371 | ddns_ttl = lease6->prefer/2; | |
372 | } | |
373 | ||
374 | if (ddns_ttl > MAX_DEFAULT_DDNS_TTL) { | |
375 | ddns_ttl = MAX_DEFAULT_DDNS_TTL; | |
376 | } | |
377 | #endif | |
378 | ||
98bd7ca0 DH |
379 | if ((oc = lookup_option(&server_universe, options, SV_DDNS_TTL))) { |
380 | if (evaluate_option_cache(&d1, packet, lease, NULL, | |
2b58b865 SR |
381 | packet->options, options, |
382 | scope, oc, MDL)) { | |
478028e7 | 383 | if (d1.len == sizeof (u_int32_t)) |
2b58b865 | 384 | ddns_ttl = getULong (d1.data); |
478028e7 TL |
385 | data_string_forget (&d1, MDL); |
386 | } | |
387 | } | |
388 | ||
2b58b865 SR |
389 | ddns_cb->ttl = ddns_ttl; |
390 | ||
478028e7 | 391 | /* |
61d75ea2 | 392 | * Compute the reverse IP name, starting with the domain name. |
b992d7e2 | 393 | */ |
61d75ea2 DH |
394 | oc = lookup_option(&server_universe, options, SV_DDNS_REV_DOMAIN_NAME); |
395 | if (oc) | |
396 | s1 = evaluate_option_cache(&d1, packet, lease, NULL, | |
397 | packet->options, options, | |
398 | scope, oc, MDL); | |
399 | else | |
400 | s1 = 0; | |
98bd7ca0 DH |
401 | |
402 | /* | |
403 | * Figure out the length of the part of the name that depends | |
404 | * on the address. | |
405 | */ | |
98bf1607 | 406 | if (ddns_cb->address.len == 4) { |
61d75ea2 | 407 | char buf[17]; |
98bd7ca0 DH |
408 | /* XXX: WOW this is gross. */ |
409 | rev_name_len = snprintf(buf, sizeof(buf), "%u.%u.%u.%u.", | |
98bf1607 SR |
410 | ddns_cb->address.iabuf[3] & 0xff, |
411 | ddns_cb->address.iabuf[2] & 0xff, | |
412 | ddns_cb->address.iabuf[1] & 0xff, | |
413 | ddns_cb->address.iabuf[0] & 0xff) + 1; | |
61d75ea2 DH |
414 | |
415 | if (s1) { | |
416 | rev_name_len += d1.len; | |
417 | ||
418 | if (rev_name_len > 255) { | |
419 | log_error("ddns_update: Calculated rev domain " | |
420 | "name too long."); | |
421 | s1 = 0; | |
422 | data_string_forget(&d1, MDL); | |
423 | } | |
424 | } | |
98bf1607 | 425 | } else if (ddns_cb->address.len == 16) { |
98bd7ca0 DH |
426 | /* |
427 | * IPv6 reverse names are always the same length, with | |
428 | * 32 hex characters separated by dots. | |
429 | */ | |
61d75ea2 DH |
430 | rev_name_len = sizeof("0.1.2.3.4.5.6.7." |
431 | "8.9.a.b.c.d.e.f." | |
432 | "0.1.2.3.4.5.6.7." | |
433 | "8.9.a.b.c.d.e.f." | |
434 | "ip6.arpa."); | |
435 | ||
436 | /* Set s1 to make sure we gate into updates. */ | |
437 | s1 = 1; | |
6705543f | 438 | } else { |
98bf1607 | 439 | log_fatal("invalid address length %d", ddns_cb->address.len); |
6705543f DH |
440 | /* Silence compiler warnings. */ |
441 | return 0; | |
442 | } | |
98bd7ca0 | 443 | |
61d75ea2 DH |
444 | /* See if we are configured NOT to do reverse ptr updates */ |
445 | if ((oc = lookup_option(&server_universe, options, | |
446 | SV_DO_REVERSE_UPDATES)) && | |
447 | !evaluate_boolean_option_cache(&ignorep, packet, lease, NULL, | |
98bd7ca0 | 448 | packet->options, options, |
61d75ea2 | 449 | scope, oc, MDL)) { |
98bf1607 | 450 | ddns_cb->flags &= ~DDNS_UPDATE_PTR; |
98311e4b DH |
451 | } |
452 | ||
61d75ea2 | 453 | if (s1) { |
a07d99bb TM |
454 | if (buffer_allocate(&ddns_cb->rev_name.buffer, |
455 | rev_name_len, MDL)) { | |
98bf1607 SR |
456 | struct data_string *rname = &ddns_cb->rev_name; |
457 | rname->data = rname->buffer->data; | |
458 | ||
459 | if (ddns_cb->address.len == 4) { | |
460 | rname->len = | |
461 | sprintf((char *)rname->buffer->data, | |
61d75ea2 | 462 | "%u.%u.%u.%u.", |
98bf1607 SR |
463 | ddns_cb->address.iabuf[3] & 0xff, |
464 | ddns_cb->address.iabuf[2] & 0xff, | |
465 | ddns_cb->address.iabuf[1] & 0xff, | |
466 | ddns_cb->address.iabuf[0] & 0xff); | |
61d75ea2 DH |
467 | |
468 | /* | |
469 | * d1.data may be opaque, garbage bytes, from | |
470 | * user (mis)configuration. | |
471 | */ | |
98bf1607 SR |
472 | data_string_append(rname, &d1); |
473 | rname->buffer->data[rname->len] = '\0'; | |
474 | } else if (ddns_cb->address.len == 16) { | |
475 | char *p = (char *)&rname->buffer->data; | |
476 | unsigned char *a = ddns_cb->address.iabuf + 15; | |
98bd7ca0 DH |
477 | for (i=0; i<16; i++) { |
478 | sprintf(p, "%x.%x.", | |
479 | (*a & 0xF), ((*a >> 4) & 0xF)); | |
480 | p += 4; | |
481 | a -= 1; | |
482 | } | |
61d75ea2 | 483 | strcat(p, "ip6.arpa."); |
98bf1607 | 484 | rname->len = strlen((const char *)rname->data); |
98bd7ca0 | 485 | } |
98311e4b | 486 | |
98bf1607 | 487 | rname->terminated = 1; |
b992d7e2 | 488 | } |
98bd7ca0 | 489 | |
61d75ea2 DH |
490 | if (d1.data != NULL) |
491 | data_string_forget(&d1, MDL); | |
b992d7e2 DN |
492 | } |
493 | ||
d7d9c0c7 SR |
494 | /* |
495 | * copy the string now so we can pass it to the dhcid routines | |
496 | * via the ddns_cb pointer | |
497 | */ | |
498 | data_string_copy(&ddns_cb->fwd_name, &ddns_fwd_name, MDL); | |
499 | ||
b992d7e2 | 500 | /* |
478028e7 | 501 | * If we are updating the A record, compute the DHCID value. |
d7d9c0c7 SR |
502 | * We have two options for computing the DHCID value, the older |
503 | * interim version and the newer standard version. The interim | |
504 | * has some issues but is left as is to avoid compatibility issues. | |
505 | * | |
506 | * We select the type of DHCID to construct and the information to | |
507 | * use for the digest based on 4701 section 3.3 | |
b992d7e2 | 508 | */ |
98bf1607 | 509 | if ((ddns_cb->flags & DDNS_UPDATE_ADDR) != 0) { |
d7d9c0c7 SR |
510 | int ddns_type; |
511 | int ddns_len; | |
512 | if (ddns_update_style == DDNS_UPDATE_STYLE_STANDARD) { | |
513 | /* The standard style */ | |
514 | ddns_cb->lease_tag = ddns_standard_tag; | |
515 | ddns_cb->dhcid_class = dns_rdatatype_dhcid; | |
516 | ddns_type = 1; | |
517 | ddns_len = 4; | |
518 | } else { | |
519 | /* The older interim style */ | |
520 | ddns_cb->lease_tag = ddns_interim_tag; | |
521 | ddns_cb->dhcid_class = dns_rdatatype_txt; | |
522 | /* for backwards compatibility */ | |
523 | ddns_type = DHO_DHCP_CLIENT_IDENTIFIER; | |
524 | /* IAID incorrectly included */ | |
525 | ddns_len = 0; | |
526 | } | |
527 | ||
528 | ||
529 | if (lease6 != NULL) { | |
530 | if (lease6->ia->iaid_duid.len < ddns_len) | |
531 | goto badfqdn; | |
532 | result = get_dhcid(ddns_cb, 2, | |
533 | lease6->ia->iaid_duid.data + ddns_len, | |
534 | lease6->ia->iaid_duid.len - ddns_len); | |
535 | } else if ((lease != NULL) && | |
536 | (lease->uid != NULL) && | |
537 | (lease->uid_len != 0)) { | |
538 | /* If this is standard check for an RFC 4361 | |
539 | * compliant client identifier | |
540 | */ | |
541 | if ((ddns_update_style == DDNS_UPDATE_STYLE_STANDARD) && | |
542 | (lease->uid[0] == 255)) { | |
543 | if (lease->uid_len < 5) | |
544 | goto badfqdn; | |
545 | result = get_dhcid(ddns_cb, 2, | |
546 | lease->uid + 5, | |
547 | lease->uid_len - 5); | |
548 | } else { | |
549 | result = get_dhcid(ddns_cb, ddns_type, | |
550 | lease->uid, | |
551 | lease->uid_len); | |
552 | } | |
553 | } else if (lease != NULL) | |
554 | result = get_dhcid(ddns_cb, 0, | |
555 | lease->hardware_addr.hbuf, | |
556 | lease->hardware_addr.hlen); | |
98bd7ca0 DH |
557 | else |
558 | log_fatal("Impossible condition at %s:%d.", MDL); | |
559 | ||
d758ad8c TL |
560 | if (!result) |
561 | goto badfqdn; | |
478028e7 | 562 | } |
b992d7e2 | 563 | |
b992d7e2 DN |
564 | /* |
565 | * Perform updates. | |
566 | */ | |
3004bebf | 567 | |
b45889b4 | 568 | if (ddns_cb->flags & DDNS_UPDATE_ADDR) { |
98bd7ca0 | 569 | oc = lookup_option(&server_universe, options, |
3004bebf | 570 | SV_DDNS_CONFLICT_DETECT); |
98bf1607 SR |
571 | if (oc && |
572 | !evaluate_boolean_option_cache(&ignorep, packet, lease, | |
573 | NULL, packet->options, | |
574 | options, scope, oc, MDL)) | |
575 | ddns_cb->flags |= DDNS_CONFLICT_OVERRIDE; | |
3004bebf | 576 | |
3004bebf | 577 | } |
75ab3070 | 578 | |
98bf1607 SR |
579 | /* |
580 | * Previously if we failed during the removal operations | |
581 | * we skipped the fqdn option processing. I'm not sure | |
582 | * if we want to continue with that if we fail before sending | |
583 | * the ddns messages. Currently we don't. | |
584 | */ | |
585 | if (do_remove) { | |
dd9237c3 TM |
586 | /* |
587 | * We should log a more specific error closer to the actual | |
588 | * error if we want one. ddns_removal failure not logged here. | |
589 | */ | |
590 | (void) ddns_removals(lease, lease6, ddns_cb, ISC_TRUE); | |
b992d7e2 | 591 | } |
98bf1607 SR |
592 | else { |
593 | ddns_fwd_srv_connector(lease, lease6, scope, ddns_cb, | |
594 | ISC_R_SUCCESS); | |
b992d7e2 | 595 | } |
98bf1607 | 596 | ddns_cb = NULL; |
b992d7e2 | 597 | |
478028e7 | 598 | noerror: |
1ba87b37 EH |
599 | /* |
600 | * If fqdn-reply option is disabled in dhcpd.conf, then don't | |
601 | * send the client an FQDN option at all, even if one was requested. | |
602 | * (WinXP clients allegedly misbehave if the option is present, | |
603 | * refusing to handle PTR updates themselves). | |
604 | */ | |
98bd7ca0 DH |
605 | if ((oc = lookup_option (&server_universe, options, SV_FQDN_REPLY)) && |
606 | !evaluate_boolean_option_cache(&ignorep, packet, lease, NULL, | |
607 | packet->options, options, | |
608 | scope, oc, MDL)) { | |
1ba87b37 EH |
609 | goto badfqdn; |
610 | ||
a396d25f DH |
611 | /* If we're ignoring client updates, then we tell a sort of 'white |
612 | * lie'. We've already updated the name the server wants (per the | |
613 | * config written by the server admin). Now let the client do as | |
614 | * it pleases with the name they supplied (if any). | |
615 | * | |
616 | * We only form an FQDN option this way if the client supplied an | |
617 | * FQDN option that had FQDN_SERVER_UPDATE set false. | |
618 | */ | |
1ba87b37 | 619 | } else if (client_ignorep && |
a396d25f DH |
620 | (oc = lookup_option(&fqdn_universe, packet->options, |
621 | FQDN_SERVER_UPDATE)) && | |
622 | !evaluate_boolean_option_cache(&ignorep, packet, lease, NULL, | |
98bd7ca0 DH |
623 | packet->options, options, |
624 | scope, oc, MDL)) { | |
a396d25f DH |
625 | oc = lookup_option(&fqdn_universe, packet->options, FQDN_FQDN); |
626 | if (oc && evaluate_option_cache(&d1, packet, lease, NULL, | |
98bd7ca0 DH |
627 | packet->options, options, |
628 | scope, oc, MDL)) { | |
a396d25f DH |
629 | if (d1.len == 0 || |
630 | !buffer_allocate(&bp, d1.len + 5, MDL)) | |
631 | goto badfqdn; | |
632 | ||
633 | /* Server pretends it is not updating. */ | |
634 | bp->data[0] = 0; | |
98bd7ca0 | 635 | if (!save_option_buffer(&fqdn_universe, options, |
a396d25f | 636 | bp, &bp->data[0], 1, |
8f4c32a1 | 637 | FQDN_SERVER_UPDATE, 0)) |
a396d25f DH |
638 | goto badfqdn; |
639 | ||
640 | /* Client is encouraged to update. */ | |
641 | bp->data[1] = 0; | |
98bd7ca0 | 642 | if (!save_option_buffer(&fqdn_universe, options, |
a396d25f | 643 | bp, &bp->data[1], 1, |
8f4c32a1 | 644 | FQDN_NO_CLIENT_UPDATE, 0)) |
a396d25f DH |
645 | goto badfqdn; |
646 | ||
647 | /* Use the encoding of client's FQDN option. */ | |
648 | oc = lookup_option(&fqdn_universe, packet->options, | |
649 | FQDN_ENCODED); | |
98bd7ca0 DH |
650 | if (oc && |
651 | evaluate_boolean_option_cache(&ignorep, packet, | |
652 | lease, NULL, | |
653 | packet->options, | |
654 | options, scope, | |
655 | oc, MDL)) | |
a396d25f DH |
656 | bp->data[2] = 1; /* FQDN is encoded. */ |
657 | else | |
658 | bp->data[2] = 0; /* FQDN is not encoded. */ | |
659 | ||
98bd7ca0 | 660 | if (!save_option_buffer(&fqdn_universe, options, |
a396d25f | 661 | bp, &bp->data[2], 1, |
8f4c32a1 | 662 | FQDN_ENCODED, 0)) |
a396d25f DH |
663 | goto badfqdn; |
664 | ||
665 | /* Current FQDN drafts indicate 255 is mandatory. */ | |
666 | bp->data[3] = 255; | |
98bd7ca0 | 667 | if (!save_option_buffer(&fqdn_universe, options, |
a396d25f | 668 | bp, &bp->data[3], 1, |
8f4c32a1 | 669 | FQDN_RCODE1, 0)) |
a396d25f DH |
670 | goto badfqdn; |
671 | ||
672 | bp->data[4] = 255; | |
98bd7ca0 | 673 | if (!save_option_buffer(&fqdn_universe, options, |
a396d25f | 674 | bp, &bp->data[4], 1, |
8f4c32a1 | 675 | FQDN_RCODE2, 0)) |
a396d25f DH |
676 | goto badfqdn; |
677 | ||
678 | /* Copy in the FQDN supplied by the client. Note well | |
679 | * that the format of this option in the cache is going | |
680 | * to be in text format. If the fqdn supplied by the | |
681 | * client is encoded, it is decoded into the option | |
682 | * cache when parsed out of the packet. It will be | |
683 | * re-encoded when the option is assembled to be | |
684 | * transmitted if the client elects that encoding. | |
685 | */ | |
686 | memcpy(&bp->data[5], d1.data, d1.len); | |
98bd7ca0 | 687 | if (!save_option_buffer(&fqdn_universe, options, |
928618dd | 688 | bp, &bp->data[5], d1.len, |
8f4c32a1 | 689 | FQDN_FQDN, 0)) |
a396d25f DH |
690 | goto badfqdn; |
691 | ||
692 | data_string_forget(&d1, MDL); | |
693 | } | |
694 | /* Set up the outgoing FQDN option if there was an incoming | |
695 | * FQDN option. If there's a valid FQDN option, there MUST | |
696 | * be an FQDN_SERVER_UPDATES suboption, it's part of the fixed | |
697 | * length head of the option contents, so we test the latter | |
698 | * to detect the presence of the former. | |
699 | */ | |
700 | } else if ((oc = lookup_option(&fqdn_universe, packet->options, | |
701 | FQDN_ENCODED)) && | |
702 | buffer_allocate(&bp, ddns_fwd_name.len + 5, MDL)) { | |
478028e7 | 703 | bp -> data [0] = server_updates_a; |
98bd7ca0 DH |
704 | if (!save_option_buffer(&fqdn_universe, options, |
705 | bp, &bp->data [0], 1, | |
706 | FQDN_SERVER_UPDATE, 0)) | |
478028e7 TL |
707 | goto badfqdn; |
708 | bp -> data [1] = server_updates_a; | |
98bd7ca0 DH |
709 | if (!save_option_buffer(&fqdn_universe, options, |
710 | bp, &bp->data [1], 1, | |
f7fdb216 | 711 | FQDN_NO_CLIENT_UPDATE, 0)) |
478028e7 | 712 | goto badfqdn; |
a396d25f | 713 | |
478028e7 | 714 | /* Do the same encoding the client did. */ |
a396d25f DH |
715 | if (evaluate_boolean_option_cache(&ignorep, packet, lease, |
716 | NULL, packet->options, | |
98bd7ca0 | 717 | options, scope, oc, MDL)) |
478028e7 TL |
718 | bp -> data [2] = 1; |
719 | else | |
720 | bp -> data [2] = 0; | |
98bd7ca0 DH |
721 | if (!save_option_buffer(&fqdn_universe, options, |
722 | bp, &bp->data [2], 1, | |
723 | FQDN_ENCODED, 0)) | |
478028e7 | 724 | goto badfqdn; |
98bf1607 | 725 | bp -> data [3] = 255;//isc_rcode_to_ns (rcode1); |
98bd7ca0 DH |
726 | if (!save_option_buffer(&fqdn_universe, options, |
727 | bp, &bp->data [3], 1, | |
728 | FQDN_RCODE1, 0)) | |
478028e7 | 729 | goto badfqdn; |
98bf1607 | 730 | bp -> data [4] = 255;//isc_rcode_to_ns (rcode2); |
98bd7ca0 DH |
731 | if (!save_option_buffer(&fqdn_universe, options, |
732 | bp, &bp->data [4], 1, | |
733 | FQDN_RCODE2, 0)) | |
478028e7 TL |
734 | goto badfqdn; |
735 | if (ddns_fwd_name.len) { | |
736 | memcpy (&bp -> data [5], | |
737 | ddns_fwd_name.data, ddns_fwd_name.len); | |
98bd7ca0 DH |
738 | if (!save_option_buffer(&fqdn_universe, options, |
739 | bp, &bp->data [5], | |
478028e7 | 740 | ddns_fwd_name.len, |
f7fdb216 | 741 | FQDN_FQDN, 0)) |
478028e7 TL |
742 | goto badfqdn; |
743 | } | |
b992d7e2 DN |
744 | } |
745 | ||
478028e7 TL |
746 | badfqdn: |
747 | out: | |
b992d7e2 DN |
748 | /* |
749 | * Final cleanup. | |
750 | */ | |
98bf1607 SR |
751 | if (ddns_cb != NULL) { |
752 | ddns_cb_free(ddns_cb, MDL); | |
753 | } | |
754 | ||
a396d25f DH |
755 | data_string_forget(&d1, MDL); |
756 | data_string_forget(&ddns_hostname, MDL); | |
757 | data_string_forget(&ddns_domainname, MDL); | |
758 | data_string_forget(&old_ddns_fwd_name, MDL); | |
759 | data_string_forget(&ddns_fwd_name, MDL); | |
c3993513 | 760 | if (bp) |
a396d25f | 761 | buffer_dereference(&bp, MDL); |
b992d7e2 | 762 | |
478028e7 | 763 | return result; |
b992d7e2 DN |
764 | } |
765 | ||
d13db163 | 766 | /*%< |
98bf1607 SR |
767 | * Utility function to update text strings within a lease. |
768 | * | |
769 | * The first issue is to find the proper scope. Sometimes we shall be | |
770 | * called with a pointer to the scope in other cases we need to find | |
771 | * the proper lease and then get the scope. Once we have the scope we update | |
772 | * the proper strings, as indicated by the state value in the control block. | |
773 | * Lastly, if we needed to find the scope we write it out, if we used a | |
774 | * scope that was passed as an argument we don't write it, assuming that | |
775 | * our caller (or his ...) will do the write. | |
d13db163 SR |
776 | * |
777 | *\li ddns_cb - the control block for the DDNS request | |
778 | * | |
779 | *\li inscope - a pointer to the scope to update. This may be NULL | |
780 | * in which case we use the control block to find the lease and | |
781 | * then the scope. | |
782 | * | |
783 | * Returns | |
784 | *\li ISC_R_SUCCESS | |
785 | * | |
786 | *\li ISC_R_FAILURE - The routine was unable to find an expected scope. | |
787 | * In some cases (static and inactive leases) we don't expect a scope | |
788 | * and return success. | |
98bf1607 SR |
789 | */ |
790 | ||
791 | isc_result_t | |
792 | ddns_update_lease_text(dhcp_ddns_cb_t *ddns_cb, | |
793 | struct binding_scope **inscope) | |
794 | { | |
795 | struct binding_scope **scope = NULL; | |
796 | struct lease *lease = NULL; | |
797 | struct iasubopt *lease6 = NULL; | |
798 | struct ipv6_pool *pool = NULL; | |
799 | struct in6_addr addr; | |
800 | struct data_string lease_dhcid; | |
801 | ||
3221151b SR |
802 | /* |
803 | * If the lease was static (for a fixed address) | |
804 | * we don't need to do any work. | |
805 | */ | |
806 | if (ddns_cb->flags & DDNS_STATIC_LEASE) | |
807 | return (ISC_R_SUCCESS); | |
808 | ||
0ef9a46e SR |
809 | /* |
810 | * If we are processing an expired or released v6 lease | |
d13db163 SR |
811 | * or some types of v4 leases we don't actually have a |
812 | * scope to update | |
0ef9a46e | 813 | */ |
d13db163 | 814 | if ((ddns_cb->flags & DDNS_ACTIVE_LEASE) == 0) |
0ef9a46e | 815 | return (ISC_R_SUCCESS); |
0ef9a46e | 816 | |
98bf1607 SR |
817 | if (inscope != NULL) { |
818 | scope = inscope; | |
819 | } else if (ddns_cb->address.len == 4) { | |
820 | if (find_lease_by_ip_addr(&lease, ddns_cb->address, MDL) != 0){ | |
821 | scope = &(lease->scope); | |
822 | } | |
823 | } else if (ddns_cb->address.len == 16) { | |
824 | memcpy(&addr, &ddns_cb->address.iabuf, 16); | |
825 | if ((find_ipv6_pool(&pool, D6O_IA_TA, &addr) == | |
826 | ISC_R_SUCCESS) || | |
827 | (find_ipv6_pool(&pool, D6O_IA_NA, &addr) == | |
828 | ISC_R_SUCCESS)) { | |
829 | if (iasubopt_hash_lookup(&lease6, pool->leases, | |
830 | &addr, 16, MDL)) { | |
831 | scope = &(lease6->scope); | |
832 | } | |
833 | ipv6_pool_dereference(&pool, MDL); | |
834 | } | |
835 | } else { | |
836 | log_fatal("Impossible condition at %s:%d.", MDL); | |
837 | } | |
838 | ||
839 | if (scope == NULL) { | |
840 | /* If necessary get rid of the lease */ | |
841 | if (lease) { | |
842 | lease_dereference(&lease, MDL); | |
843 | } | |
844 | else if (lease6) { | |
845 | iasubopt_dereference(&lease6, MDL); | |
846 | } | |
847 | ||
848 | return(ISC_R_FAILURE); | |
849 | } | |
850 | ||
851 | /* We now have a scope and can proceed to update it */ | |
852 | switch(ddns_cb->state) { | |
853 | case DDNS_STATE_REM_PTR: | |
854 | unset(*scope, "ddns-rev-name"); | |
855 | if ((ddns_cb->flags & DDNS_CLIENT_DID_UPDATE) != 0) { | |
856 | unset(*scope, "ddns-client-fqdn"); | |
857 | } | |
858 | break; | |
859 | ||
860 | case DDNS_STATE_ADD_PTR: | |
861 | case DDNS_STATE_CLEANUP: | |
862 | bind_ds_value(scope, "ddns-rev-name", &ddns_cb->rev_name); | |
863 | if ((ddns_cb->flags & DDNS_UPDATE_ADDR) == 0) { | |
864 | bind_ds_value(scope, "ddns-client-fqdn", | |
865 | &ddns_cb->fwd_name); | |
866 | } | |
867 | break; | |
868 | ||
869 | case DDNS_STATE_ADD_FW_YXDHCID: | |
870 | case DDNS_STATE_ADD_FW_NXDOMAIN: | |
871 | bind_ds_value(scope, "ddns-fwd-name", &ddns_cb->fwd_name); | |
872 | ||
d7d9c0c7 SR |
873 | if (ddns_cb->lease_tag == ddns_standard_tag) { |
874 | bind_ds_value(scope, ddns_standard_tag, &ddns_cb->dhcid); | |
875 | } else { | |
876 | /* convert from dns version to lease version of dhcid */ | |
877 | memset(&lease_dhcid, 0, sizeof(lease_dhcid)); | |
878 | dhcid_tolease(&ddns_cb->dhcid, &lease_dhcid); | |
879 | bind_ds_value(scope, ddns_interim_tag, &lease_dhcid); | |
880 | data_string_forget(&lease_dhcid, MDL); | |
881 | } | |
98bf1607 SR |
882 | break; |
883 | ||
884 | case DDNS_STATE_REM_FW_NXRR: | |
885 | case DDNS_STATE_REM_FW_YXDHCID: | |
886 | unset(*scope, "ddns-fwd-name"); | |
d7d9c0c7 | 887 | unset(*scope, ddns_cb->lease_tag); |
98bf1607 SR |
888 | break; |
889 | } | |
890 | ||
891 | /* If necessary write it out and get rid of the lease */ | |
892 | if (lease) { | |
893 | write_lease(lease); | |
894 | lease_dereference(&lease, MDL); | |
895 | } else if (lease6) { | |
896 | write_ia(lease6->ia); | |
897 | iasubopt_dereference(&lease6, MDL); | |
898 | } | |
899 | ||
900 | return(ISC_R_SUCCESS); | |
901 | } | |
902 | ||
beaed73f SR |
903 | /* |
904 | * This function should be called when update_lease_ptr function fails. | |
905 | * It does inform user about the condition, provides some hints how to | |
906 | * resolve this and dies gracefully. This can happend in at least three | |
907 | * cases (all are configuration mistakes): | |
908 | * a) IPv4: user have duplicate fixed-address entries (the same | |
909 | * address is defined twice). We may have found wrong lease. | |
910 | * b) IPv6: user have overlapping pools (we tried to find | |
911 | * a lease in a wrong pool) | |
912 | * c) IPv6: user have duplicate fixed-address6 entires (the same | |
913 | * address is defined twice). We may have found wrong lease. | |
914 | * | |
915 | * Comment: while it would be possible to recover from both cases | |
916 | * by forcibly searching for leases in *all* following pools, that would | |
917 | * only hide the real problem - a misconfiguration. Proper solution | |
918 | * is to log the problem, die and let the user fix his config file. | |
919 | */ | |
920 | void | |
921 | update_lease_failed(struct lease *lease, | |
922 | struct iasubopt *lease6, | |
923 | dhcp_ddns_cb_t *ddns_cb, | |
924 | dhcp_ddns_cb_t *ddns_cb_set, | |
925 | const char * file, int line) | |
926 | { | |
927 | char lease_address[MAX_ADDRESS_STRING_LEN + 64]; | |
928 | char reason[128]; /* likely reason */ | |
929 | ||
930 | sprintf(reason, "unknown"); | |
931 | sprintf(lease_address, "unknown"); | |
932 | ||
3221151b SR |
933 | /* |
934 | * let's pretend that everything is ok, so we can continue for | |
935 | * information gathering purposes | |
936 | */ | |
beaed73f SR |
937 | |
938 | if (ddns_cb != NULL) { | |
939 | strncpy(lease_address, piaddr(ddns_cb->address), | |
940 | MAX_ADDRESS_STRING_LEN); | |
941 | ||
942 | if (ddns_cb->address.len == 4) { | |
943 | sprintf(reason, "duplicate IPv4 fixed-address entry"); | |
944 | } else if (ddns_cb->address.len == 16) { | |
945 | sprintf(reason, "duplicate IPv6 fixed-address6 entry " | |
946 | "or overlapping pools"); | |
947 | } else { | |
948 | /* | |
949 | * Should not happen. We have non-IPv4, non-IPv6 | |
950 | * address. Something is very wrong here. | |
951 | */ | |
952 | sprintf(reason, "corrupted ddns_cb structure (address " | |
953 | "length is %d)", ddns_cb->address.len); | |
954 | } | |
955 | } | |
956 | ||
957 | log_error("Failed to properly update internal lease structure with " | |
958 | "DDNS"); | |
959 | log_error("control block structures. Tried to update lease for" | |
960 | "%s address, ddns_cb=%p.", lease_address, ddns_cb); | |
961 | ||
962 | log_error("%s", ""); | |
963 | log_error("This condition can occur, if DHCP server configuration is " | |
964 | "inconsistent."); | |
965 | log_error("In particular, please do check that your configuration:"); | |
966 | log_error("a) does not have overlapping pools (especially containing"); | |
967 | log_error(" %s address).", lease_address); | |
968 | log_error("b) there are no duplicate fixed-address or fixed-address6"); | |
969 | log_error("entries for the %s address.", lease_address); | |
970 | log_error("%s", ""); | |
971 | log_error("Possible reason for this failure: %s", reason); | |
972 | ||
973 | log_fatal("%s(%d): Failed to update lease database with DDNS info for " | |
974 | "address %s. Lease database inconsistent. Unable to recover." | |
975 | " Terminating.", file, line, lease_address); | |
976 | } | |
977 | ||
978 | /* | |
979 | * utility function to update found lease. It does extra checks | |
980 | * that we are indeed updating the right lease. It may happen | |
981 | * that user have duplicate fixed-address entries, so we attempt | |
982 | * to update wrong lease. See also safe_lease6_update. | |
983 | */ | |
984 | ||
985 | void | |
986 | safe_lease_update(struct lease *lease, | |
beaed73f SR |
987 | dhcp_ddns_cb_t *oldcb, |
988 | dhcp_ddns_cb_t *newcb, | |
989 | const char *file, int line) | |
990 | { | |
3221151b SR |
991 | if (lease == NULL) { |
992 | /* should never get here */ | |
993 | log_fatal("Impossible condition at %s:%d (called from %s:%d).", | |
994 | MDL, file, line); | |
995 | } | |
beaed73f | 996 | |
3221151b SR |
997 | if ( (lease->ddns_cb == NULL) && (newcb == NULL) ) { |
998 | /* | |
999 | * Trying to clean up pointer that is already null. We | |
1000 | * are most likely trying to update wrong lease here. | |
1001 | */ | |
beaed73f | 1002 | |
3221151b SR |
1003 | /* |
1004 | * Previously this error message popped out during | |
1005 | * DNS update for fixed leases. As we no longer | |
1006 | * try to update the lease for a fixed (static) lease | |
1007 | * this should not be a problem. | |
1008 | */ | |
1009 | log_error("%s(%d): Invalid lease update. Tried to " | |
1010 | "clear already NULL DDNS control block " | |
1011 | "pointer for lease %s.", | |
1012 | file, line, piaddr(lease->ip_addr) ); | |
beaed73f SR |
1013 | |
1014 | #if defined (DNS_UPDATES_MEMORY_CHECKS) | |
3221151b | 1015 | update_lease_failed(lease, NULL, oldcb, newcb, file, line); |
beaed73f | 1016 | #endif |
3221151b SR |
1017 | /* |
1018 | * May not reach this: update_lease_failed calls | |
1019 | * log_fatal. | |
1020 | */ | |
1021 | return; | |
1022 | } | |
beaed73f | 1023 | |
3221151b SR |
1024 | if ( (lease->ddns_cb != NULL) && (lease->ddns_cb != oldcb) ) { |
1025 | /* | |
1026 | * There is existing cb structure, but it differs from | |
1027 | * what we expected to see there. Most likely we are | |
1028 | * trying to update wrong lease. | |
1029 | */ | |
1030 | log_error("%s(%d): Failed to update internal lease " | |
1031 | "structure with DDNS control block. Existing" | |
1032 | " ddns_cb structure does not match " | |
1033 | "expectations.IPv4=%s, old ddns_cb=%p, tried" | |
1034 | "to update to new ddns_cb=%p", file, line, | |
1035 | piaddr(lease->ip_addr), oldcb, newcb); | |
beaed73f SR |
1036 | |
1037 | #if defined (DNS_UPDATES_MEMORY_CHECKS) | |
3221151b | 1038 | update_lease_failed(lease, NULL, oldcb, newcb, file, line); |
beaed73f | 1039 | #endif |
3221151b SR |
1040 | /* |
1041 | * May not reach this: update_lease_failed calls | |
1042 | * log_fatal. | |
1043 | */ | |
1044 | return; | |
1045 | } | |
beaed73f | 1046 | |
3221151b SR |
1047 | /* additional IPv4 specific checks may be added here */ |
1048 | ||
1049 | /* update the lease */ | |
1050 | lease->ddns_cb = newcb; | |
1051 | } | |
1052 | ||
1053 | void | |
1054 | safe_lease6_update(struct iasubopt *lease6, | |
1055 | dhcp_ddns_cb_t *oldcb, | |
1056 | dhcp_ddns_cb_t *newcb, | |
1057 | const char *file, int line) | |
1058 | { | |
1059 | char addrbuf[MAX_ADDRESS_STRING_LEN]; | |
1060 | ||
1061 | if (lease6 == NULL) { | |
1062 | /* should never get here */ | |
1063 | log_fatal("Impossible condition at %s:%d (called from %s:%d).", | |
1064 | MDL, file, line); | |
1065 | } | |
1066 | ||
1067 | if ( (lease6->ddns_cb == NULL) && (newcb == NULL) ) { | |
1068 | inet_ntop(AF_INET6, &lease6->addr, addrbuf, | |
1069 | MAX_ADDRESS_STRING_LEN); | |
1070 | /* | |
1071 | * Trying to clean up pointer that is already null. We | |
1072 | * are most likely trying to update wrong lease here. | |
1073 | */ | |
1074 | log_error("%s(%d): Failed to update internal lease " | |
1075 | "structure. Tried to clear already NULL " | |
1076 | "DDNS control block pointer for lease %s.", | |
1077 | file, line, addrbuf); | |
beaed73f SR |
1078 | |
1079 | #if defined (DNS_UPDATES_MEMORY_CHECKS) | |
3221151b | 1080 | update_lease_failed(NULL, lease6, oldcb, newcb, file, line); |
beaed73f SR |
1081 | #endif |
1082 | ||
3221151b SR |
1083 | /* |
1084 | * May not reach this: update_lease_failed calls | |
1085 | * log_fatal. | |
1086 | */ | |
1087 | return; | |
1088 | } | |
beaed73f | 1089 | |
3221151b SR |
1090 | if ( (lease6->ddns_cb != NULL) && (lease6->ddns_cb != oldcb) ) { |
1091 | /* | |
1092 | * there is existing cb structure, but it differs from | |
1093 | * what we expected to see there. Most likely we are | |
1094 | * trying to update wrong lease. | |
1095 | */ | |
1096 | inet_ntop(AF_INET6, &lease6->addr, addrbuf, | |
1097 | MAX_ADDRESS_STRING_LEN); | |
beaed73f | 1098 | |
3221151b SR |
1099 | log_error("%s(%d): Failed to update internal lease " |
1100 | "structure with DDNS control block. Existing" | |
1101 | " ddns_cb structure does not match " | |
1102 | "expectations.IPv6=%s, old ddns_cb=%p, tried" | |
1103 | "to update to new ddns_cb=%p", file, line, | |
1104 | addrbuf, oldcb, newcb); | |
beaed73f SR |
1105 | |
1106 | #if defined (DNS_UPDATES_MEMORY_CHECKS) | |
3221151b | 1107 | update_lease_failed(NULL, lease6, oldcb, newcb, file, line); |
beaed73f | 1108 | #endif |
3221151b SR |
1109 | /* |
1110 | * May not reach this: update_lease_failed calls | |
1111 | * log_fatal. | |
1112 | */ | |
1113 | return; | |
beaed73f | 1114 | } |
3221151b SR |
1115 | /* additional IPv6 specific checks may be added here */ |
1116 | ||
1117 | /* update the lease */ | |
1118 | lease6->ddns_cb = newcb; | |
beaed73f SR |
1119 | } |
1120 | ||
98bf1607 SR |
1121 | /* |
1122 | * Utility function to update the pointer to the DDNS control block | |
1123 | * in a lease. | |
1124 | * SUCCESS - able to update the pointer | |
1125 | * FAILURE - lease didn't exist or sanity checks failed | |
1126 | * lease and lease6 may be empty in which case we attempt to find | |
1127 | * the lease from the ddns_cb information. | |
1128 | * ddns_cb is the control block to use if a lookup is necessary | |
1129 | * ddns_cb_set is the pointer to insert into the lease and may be NULL | |
1130 | * The last two arguments may look odd as they will be the same much of the | |
1131 | * time, but I need an argument to tell me if I'm setting or clearing in | |
1132 | * addition to the address information from the cb to look up the lease. | |
1133 | * using the same value twice allows me more flexibility. | |
1134 | */ | |
1135 | ||
1136 | isc_result_t | |
1137 | ddns_update_lease_ptr(struct lease *lease, | |
1138 | struct iasubopt *lease6, | |
1139 | dhcp_ddns_cb_t *ddns_cb, | |
beaed73f SR |
1140 | dhcp_ddns_cb_t *ddns_cb_set, |
1141 | const char * file, int line) | |
98bf1607 | 1142 | { |
beaed73f | 1143 | char ddns_address[MAX_ADDRESS_STRING_LEN]; |
3221151b | 1144 | sprintf(ddns_address, "unknown"); |
0f750c4f SR |
1145 | if (ddns_cb == NULL) { |
1146 | log_info("%s(%d): No control block for lease update", | |
1147 | file, line); | |
1148 | return (ISC_R_FAILURE); | |
1149 | } | |
1150 | else { | |
36e2c224 | 1151 | strcpy(ddns_address, piaddr(ddns_cb->address)); |
beaed73f SR |
1152 | } |
1153 | #if defined (DEBUG_DNS_UPDATES) | |
1154 | log_info("%s(%d): Updating lease_ptr for ddns_cp=%p (addr=%s)", | |
1155 | file, line, ddns_cb, ddns_address ); | |
1156 | #endif | |
1157 | ||
3221151b SR |
1158 | /* |
1159 | * If the lease was static (for a fixed address) | |
1160 | * we don't need to do any work. | |
1161 | */ | |
1162 | if (ddns_cb->flags & DDNS_STATIC_LEASE) { | |
1163 | #if defined (DEBUG_DNS_UPDATES) | |
1164 | log_info("lease is static, returning"); | |
1165 | #endif | |
1166 | return (ISC_R_SUCCESS); | |
1167 | } | |
1168 | ||
0ef9a46e SR |
1169 | /* |
1170 | * If we are processing an expired or released v6 lease | |
d13db163 | 1171 | * we don't actually have a lease to update |
0ef9a46e SR |
1172 | */ |
1173 | if ((ddns_cb->address.len == 16) && | |
1174 | ((ddns_cb->flags & DDNS_ACTIVE_LEASE) == 0)) { | |
1175 | return (ISC_R_SUCCESS); | |
1176 | } | |
1177 | ||
98bf1607 | 1178 | if (lease != NULL) { |
3221151b | 1179 | safe_lease_update(lease, ddns_cb, ddns_cb_set, |
beaed73f | 1180 | file, line); |
98bf1607 | 1181 | } else if (lease6 != NULL) { |
3221151b | 1182 | safe_lease6_update(lease6, ddns_cb, ddns_cb_set, |
beaed73f | 1183 | file, line); |
98bf1607 SR |
1184 | } else if (ddns_cb->address.len == 4) { |
1185 | struct lease *find_lease = NULL; | |
1186 | if (find_lease_by_ip_addr(&find_lease, | |
1187 | ddns_cb->address, MDL) != 0) { | |
beaed73f SR |
1188 | #if defined (DEBUG_DNS_UPDATES) |
1189 | log_info("%s(%d): find_lease_by_ip_addr(%s) successful:" | |
1190 | "lease=%p", file, line, ddns_address, | |
1191 | find_lease); | |
1192 | #endif | |
1193 | ||
3221151b | 1194 | safe_lease_update(find_lease, ddns_cb, |
beaed73f | 1195 | ddns_cb_set, file, line); |
98bf1607 SR |
1196 | lease_dereference(&find_lease, MDL); |
1197 | } | |
1198 | else { | |
beaed73f | 1199 | log_error("%s(%d): ddns_update_lease_ptr failed. " |
3221151b | 1200 | "Lease for %s not found.", |
beaed73f | 1201 | file, line, piaddr(ddns_cb->address)); |
beaed73f SR |
1202 | |
1203 | #if defined (DNS_UPDATES_MEMORY_CHECKS) | |
1204 | update_lease_failed(NULL, NULL, ddns_cb, ddns_cb_set, | |
1205 | file, line); | |
1206 | #endif | |
1207 | /* | |
1208 | * may not reach this. update_lease_failed | |
1209 | * calls log_fatal. | |
1210 | */ | |
1211 | return(ISC_R_FAILURE); | |
1212 | ||
98bf1607 SR |
1213 | } |
1214 | } else if (ddns_cb->address.len == 16) { | |
1215 | struct iasubopt *find_lease6 = NULL; | |
1216 | struct ipv6_pool *pool = NULL; | |
1217 | struct in6_addr addr; | |
beaed73f | 1218 | char addrbuf[MAX_ADDRESS_STRING_LEN]; |
98bf1607 SR |
1219 | |
1220 | memcpy(&addr, &ddns_cb->address.iabuf, 16); | |
1221 | if ((find_ipv6_pool(&pool, D6O_IA_TA, &addr) != | |
1222 | ISC_R_SUCCESS) && | |
1223 | (find_ipv6_pool(&pool, D6O_IA_NA, &addr) != | |
1224 | ISC_R_SUCCESS)) { | |
0ef9a46e | 1225 | inet_ntop(AF_INET6, &addr, addrbuf, |
beaed73f SR |
1226 | MAX_ADDRESS_STRING_LEN); |
1227 | log_error("%s(%d): Pool for lease %s not found.", | |
1228 | file, line, addrbuf); | |
1229 | #if defined (DNS_UPDATES_MEMORY_CHECKS) | |
1230 | update_lease_failed(NULL, NULL, ddns_cb, ddns_cb_set, | |
1231 | file, line); | |
1232 | #endif | |
1233 | /* | |
1234 | * never reached. update_lease_failed | |
1235 | * calls log_fatal. | |
1236 | */ | |
98bf1607 SR |
1237 | return(ISC_R_FAILURE); |
1238 | } | |
1239 | ||
3221151b | 1240 | if (iasubopt_hash_lookup(&find_lease6, pool->leases, |
98bf1607 SR |
1241 | &addr, 16, MDL)) { |
1242 | find_lease6->ddns_cb = ddns_cb_set; | |
1243 | iasubopt_dereference(&find_lease6, MDL); | |
1244 | } else { | |
0ef9a46e | 1245 | inet_ntop(AF_INET6, &addr, addrbuf, |
beaed73f SR |
1246 | MAX_ADDRESS_STRING_LEN); |
1247 | log_error("%s(%d): Lease %s not found within pool.", | |
1248 | file, line, addrbuf); | |
1249 | #if defined (DNS_UPDATES_MEMORY_CHECKS) | |
1250 | update_lease_failed(NULL, NULL, ddns_cb, ddns_cb_set, | |
1251 | file, line); | |
1252 | #endif | |
1253 | /* | |
1254 | * never reached. update_lease_failed | |
1255 | * calls log_fatal. | |
1256 | */ | |
98bf1607 SR |
1257 | return(ISC_R_FAILURE); |
1258 | } | |
1259 | ipv6_pool_dereference(&pool, MDL); | |
1260 | } else { | |
1261 | /* shouldn't get here */ | |
beaed73f SR |
1262 | log_fatal("Impossible condition at %s:%d, called from %s:%d.", |
1263 | MDL, file, line); | |
98bf1607 SR |
1264 | } |
1265 | ||
1266 | return(ISC_R_SUCCESS); | |
1267 | } | |
1268 | ||
1269 | void | |
1270 | ddns_ptr_add(dhcp_ddns_cb_t *ddns_cb, | |
1271 | isc_result_t eresult) | |
1272 | { | |
1273 | if (eresult == ISC_R_SUCCESS) { | |
7aa153b8 | 1274 | log_info("Added reverse map from %.*s to %.*s", |
98bf1607 SR |
1275 | (int)ddns_cb->rev_name.len, |
1276 | (const char *)ddns_cb->rev_name.data, | |
1277 | (int)ddns_cb->fwd_name.len, | |
1278 | (const char *)ddns_cb->fwd_name.data); | |
1279 | ||
1280 | ddns_update_lease_text(ddns_cb, NULL); | |
1281 | } else { | |
7aa153b8 | 1282 | log_error("Unable to add reverse map from %.*s to %.*s: %s", |
98bf1607 SR |
1283 | (int)ddns_cb->rev_name.len, |
1284 | (const char *)ddns_cb->rev_name.data, | |
1285 | (int)ddns_cb->fwd_name.len, | |
1286 | (const char *)ddns_cb->fwd_name.data, | |
1287 | isc_result_totext (eresult)); | |
1288 | } | |
1289 | ||
beaed73f | 1290 | ddns_update_lease_ptr(NULL, NULL, ddns_cb, NULL, MDL); |
98bf1607 SR |
1291 | ddns_cb_free(ddns_cb, MDL); |
1292 | /* | |
1293 | * A single DDNS operation may require several calls depending on | |
1294 | * the current state as the prerequisites for the first message | |
1295 | * may not succeed requiring a second operation and potentially | |
1296 | * a ptr operation after that. The commit_leases operation is | |
1297 | * invoked at the end of this set of operations in order to require | |
1298 | * a single write for all of the changes. We call commit_leases | |
1299 | * here rather than immediately after the call to update the lease | |
1300 | * text in order to save any previously written data. | |
1301 | */ | |
1302 | commit_leases(); | |
1303 | return; | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * action routine when trying to remove a pointer | |
1308 | * this will be called after the ddns queries have completed | |
1309 | * if we succeeded in removing the pointer we go to the next step (if any) | |
1310 | * if not we cleanup and leave. | |
1311 | */ | |
1312 | ||
1313 | void | |
1314 | ddns_ptr_remove(dhcp_ddns_cb_t *ddns_cb, | |
1315 | isc_result_t eresult) | |
1316 | { | |
1317 | isc_result_t result = eresult; | |
1318 | ||
1319 | switch(eresult) { | |
1320 | case ISC_R_SUCCESS: | |
7aa153b8 | 1321 | log_info("Removed reverse map on %.*s", |
98bf1607 SR |
1322 | (int)ddns_cb->rev_name.len, |
1323 | (const char *)ddns_cb->rev_name.data); | |
1324 | /* fall through */ | |
1325 | case DNS_R_NXRRSET: | |
1326 | case DNS_R_NXDOMAIN: | |
1327 | /* No entry is the same as success. | |
1328 | * Remove the information from the lease and | |
1329 | * continue with any next step */ | |
1330 | ddns_update_lease_text(ddns_cb, NULL); | |
1331 | ||
1332 | /* trigger any add operation */ | |
1333 | result = ISC_R_SUCCESS; | |
87132514 SR |
1334 | #if defined (DEBUG_DNS_UPDATES) |
1335 | log_info("DDNS: removed map or no reverse map to remove %.*s", | |
1336 | (int)ddns_cb->rev_name.len, | |
1337 | (const char *)ddns_cb->rev_name.data); | |
1338 | #endif | |
98bf1607 SR |
1339 | break; |
1340 | ||
1341 | default: | |
7aa153b8 | 1342 | log_error("Can't remove reverse map on %.*s: %s", |
98bf1607 SR |
1343 | (int)ddns_cb->rev_name.len, |
1344 | (const char *)ddns_cb->rev_name.data, | |
1345 | isc_result_totext (eresult)); | |
1346 | break; | |
1347 | } | |
1348 | ||
ad06e7ba SR |
1349 | /* If we aren't suppossed to do the next step, set the result |
1350 | * flag so ddns_fwd_srv_connector won't do much | |
1351 | */ | |
1352 | if ((ddns_cb->flags & DDNS_EXECUTE_NEXT) == 0) | |
1353 | result = ISC_R_FAILURE; | |
1354 | ||
beaed73f | 1355 | ddns_update_lease_ptr(NULL, NULL, ddns_cb, NULL, MDL); |
98bf1607 SR |
1356 | ddns_fwd_srv_connector(NULL, NULL, NULL, ddns_cb->next_op, result); |
1357 | ddns_cb_free(ddns_cb, MDL); | |
1358 | return; | |
1359 | } | |
1360 | ||
1361 | ||
1362 | /* | |
1363 | * If the first query succeeds, the updater can conclude that it | |
1364 | * has added a new name whose only RRs are the A and DHCID RR records. | |
1365 | * The A RR update is now complete (and a client updater is finished, | |
1366 | * while a server might proceed to perform a PTR RR update). | |
1367 | * -- "Interaction between DHCP and DNS" | |
1368 | * | |
1369 | * If the second query succeeds, the updater can conclude that the current | |
1370 | * client was the last client associated with the domain name, and that | |
1371 | * the name now contains the updated A RR. The A RR update is now | |
1372 | * complete (and a client updater is finished, while a server would | |
1373 | * then proceed to perform a PTR RR update). | |
1374 | * -- "Interaction between DHCP and DNS" | |
1375 | * | |
1376 | * If the second query fails with NXRRSET, the updater must conclude | |
1377 | * that the client's desired name is in use by another host. At this | |
1378 | * juncture, the updater can decide (based on some administrative | |
1379 | * configuration outside of the scope of this document) whether to let | |
1380 | * the existing owner of the name keep that name, and to (possibly) | |
1381 | * perform some name disambiguation operation on behalf of the current | |
1382 | * client, or to replace the RRs on the name with RRs that represent | |
1383 | * the current client. If the configured policy allows replacement of | |
1384 | * existing records, the updater submits a query that deletes the | |
1385 | * existing A RR and the existing DHCID RR, adding A and DHCID RRs that | |
1386 | * represent the IP address and client-identity of the new client. | |
1387 | * -- "Interaction between DHCP and DNS" | |
1388 | */ | |
1389 | ||
1390 | void | |
1391 | ddns_fwd_srv_add2(dhcp_ddns_cb_t *ddns_cb, | |
1392 | isc_result_t eresult) | |
1393 | { | |
1394 | isc_result_t result; | |
1395 | const char *logstr = NULL; | |
beaed73f | 1396 | char ddns_address[MAX_ADDRESS_STRING_LEN]; |
98bf1607 SR |
1397 | |
1398 | /* Construct a printable form of the address for logging */ | |
1399 | strcpy(ddns_address, piaddr(ddns_cb->address)); | |
1400 | ||
1401 | switch(eresult) { | |
1402 | case ISC_R_SUCCESS: | |
1403 | log_info("Added new forward map from %.*s to %s", | |
1404 | (int)ddns_cb->fwd_name.len, | |
1405 | (const char *)ddns_cb->fwd_name.data, | |
1406 | ddns_address); | |
1407 | ||
1408 | ddns_update_lease_text(ddns_cb, NULL); | |
1409 | ||
1410 | if ((ddns_cb->flags & DDNS_UPDATE_PTR) != 0) { | |
1411 | /* if we have zone information get rid of it */ | |
1412 | if (ddns_cb->zone != NULL) { | |
1413 | ddns_cb_forget_zone(ddns_cb); | |
1414 | } | |
1415 | ||
1416 | ddns_cb->state = DDNS_STATE_ADD_PTR; | |
1417 | ddns_cb->cur_func = ddns_ptr_add; | |
1418 | ||
87132514 | 1419 | result = ddns_modify_ptr(ddns_cb, MDL); |
98bf1607 SR |
1420 | if (result == ISC_R_SUCCESS) { |
1421 | return; | |
1422 | } | |
1423 | } | |
1424 | break; | |
1425 | ||
1426 | case DNS_R_YXRRSET: | |
1427 | case DNS_R_YXDOMAIN: | |
1428 | logstr = "DHCID mismatch, belongs to another client."; | |
1429 | break; | |
1430 | ||
1431 | case DNS_R_NXRRSET: | |
1432 | case DNS_R_NXDOMAIN: | |
1433 | logstr = "Has an address record but no DHCID, not mine."; | |
1434 | break; | |
1435 | ||
1436 | default: | |
1437 | logstr = isc_result_totext(eresult); | |
1438 | break; | |
1439 | } | |
1440 | ||
1441 | if (logstr != NULL) { | |
1442 | log_error("Forward map from %.*s to %s FAILED: %s", | |
1443 | (int)ddns_cb->fwd_name.len, | |
1444 | (const char *)ddns_cb->fwd_name.data, | |
1445 | ddns_address, logstr); | |
1446 | } | |
1447 | ||
beaed73f | 1448 | ddns_update_lease_ptr(NULL, NULL, ddns_cb, NULL, MDL); |
98bf1607 SR |
1449 | ddns_cb_free(ddns_cb, MDL); |
1450 | /* | |
1451 | * A single DDNS operation may require several calls depending on | |
1452 | * the current state as the prerequisites for the first message | |
1453 | * may not succeed requiring a second operation and potentially | |
1454 | * a ptr operation after that. The commit_leases operation is | |
1455 | * invoked at the end of this set of operations in order to require | |
1456 | * a single write for all of the changes. We call commit_leases | |
1457 | * here rather than immediately after the call to update the lease | |
1458 | * text in order to save any previously written data. | |
1459 | */ | |
1460 | commit_leases(); | |
1461 | return; | |
1462 | } | |
1463 | ||
1464 | void | |
1465 | ddns_fwd_srv_add1(dhcp_ddns_cb_t *ddns_cb, | |
1466 | isc_result_t eresult) | |
1467 | { | |
1468 | isc_result_t result; | |
beaed73f | 1469 | char ddns_address[MAX_ADDRESS_STRING_LEN]; |
98bf1607 SR |
1470 | |
1471 | /* Construct a printable form of the address for logging */ | |
1472 | strcpy(ddns_address, piaddr(ddns_cb->address)); | |
1473 | ||
1474 | switch(eresult) { | |
1475 | case ISC_R_SUCCESS: | |
1476 | log_info ("Added new forward map from %.*s to %s", | |
1477 | (int)ddns_cb->fwd_name.len, | |
1478 | (const char *)ddns_cb->fwd_name.data, | |
1479 | ddns_address); | |
1480 | ||
1481 | ddns_update_lease_text(ddns_cb, NULL); | |
1482 | ||
1483 | if ((ddns_cb->flags & DDNS_UPDATE_PTR) != 0) { | |
1484 | /* if we have zone information get rid of it */ | |
1485 | if (ddns_cb->zone != NULL) { | |
1486 | ddns_cb_forget_zone(ddns_cb); | |
1487 | } | |
1488 | ||
1489 | ddns_cb->state = DDNS_STATE_ADD_PTR; | |
1490 | ddns_cb->cur_func = ddns_ptr_add; | |
1491 | ||
87132514 | 1492 | result = ddns_modify_ptr(ddns_cb, MDL); |
98bf1607 SR |
1493 | if (result == ISC_R_SUCCESS) { |
1494 | return; | |
1495 | } | |
1496 | } | |
98bf1607 SR |
1497 | break; |
1498 | ||
1499 | case DNS_R_YXDOMAIN: | |
1500 | /* we can reuse the zone information */ | |
1501 | ddns_cb->state = DDNS_STATE_ADD_FW_YXDHCID; | |
1502 | ddns_cb->cur_func = ddns_fwd_srv_add2; | |
1503 | ||
87132514 | 1504 | result = ddns_modify_fwd(ddns_cb, MDL); |
98bf1607 SR |
1505 | if (result == ISC_R_SUCCESS) { |
1506 | return; | |
1507 | } | |
98bf1607 SR |
1508 | break; |
1509 | ||
1510 | default: | |
1511 | log_error ("Unable to add forward map from %.*s to %s: %s", | |
1512 | (int)ddns_cb->fwd_name.len, | |
1513 | (const char *)ddns_cb->fwd_name.data, | |
1514 | ddns_address, | |
1515 | isc_result_totext (eresult)); | |
1516 | break; | |
1517 | } | |
1518 | ||
beaed73f | 1519 | ddns_update_lease_ptr(NULL, NULL, ddns_cb, NULL, MDL); |
98bf1607 SR |
1520 | ddns_cb_free(ddns_cb, MDL); |
1521 | /* | |
1522 | * A single DDNS operation may require several calls depending on | |
1523 | * the current state as the prerequisites for the first message | |
1524 | * may not succeed requiring a second operation and potentially | |
1525 | * a ptr operation after that. The commit_leases operation is | |
1526 | * invoked at the end of this set of operations in order to require | |
1527 | * a single write for all of the changes. We call commit_leases | |
1528 | * here rather than immediately after the call to update the lease | |
1529 | * text in order to save any previously written data. | |
1530 | */ | |
1531 | commit_leases(); | |
1532 | return; | |
1533 | } | |
1534 | ||
1535 | static void | |
1536 | ddns_fwd_srv_connector(struct lease *lease, | |
1537 | struct iasubopt *lease6, | |
1538 | struct binding_scope **inscope, | |
1539 | dhcp_ddns_cb_t *ddns_cb, | |
1540 | isc_result_t eresult) | |
1541 | { | |
1542 | isc_result_t result = ISC_R_FAILURE; | |
1543 | ||
1544 | if (ddns_cb == NULL) { | |
1545 | /* nothing to do */ | |
1546 | return; | |
1547 | } | |
1548 | ||
1549 | if (eresult == ISC_R_SUCCESS) { | |
1550 | /* | |
1551 | * If we have updates dispatch as appropriate, | |
1552 | * if not do FQDN binding if desired. | |
1553 | */ | |
1554 | ||
1555 | if (ddns_cb->flags & DDNS_UPDATE_ADDR) { | |
1556 | ddns_cb->state = DDNS_STATE_ADD_FW_NXDOMAIN; | |
1557 | ddns_cb->cur_func = ddns_fwd_srv_add1; | |
87132514 | 1558 | result = ddns_modify_fwd(ddns_cb, MDL); |
98bf1607 SR |
1559 | } else if ((ddns_cb->flags & DDNS_UPDATE_PTR) && |
1560 | (ddns_cb->rev_name.len != 0)) { | |
1561 | ddns_cb->state = DDNS_STATE_ADD_PTR; | |
1562 | ddns_cb->cur_func = ddns_ptr_add; | |
87132514 | 1563 | result = ddns_modify_ptr(ddns_cb, MDL); |
98bf1607 SR |
1564 | } else { |
1565 | ddns_update_lease_text(ddns_cb, inscope); | |
1566 | } | |
1567 | } | |
1568 | ||
1569 | if (result == ISC_R_SUCCESS) { | |
beaed73f | 1570 | ddns_update_lease_ptr(lease, lease6, ddns_cb, ddns_cb, MDL); |
98bf1607 SR |
1571 | } else { |
1572 | ddns_cb_free(ddns_cb, MDL); | |
1573 | } | |
1574 | ||
1575 | return; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * If the first query fails, the updater MUST NOT delete the DNS name. It | |
1580 | * may be that the host whose lease on the server has expired has moved | |
1581 | * to another network and obtained a lease from a different server, | |
1582 | * which has caused the client's A RR to be replaced. It may also be | |
1583 | * that some other client has been configured with a name that matches | |
1584 | * the name of the DHCP client, and the policy was that the last client | |
1585 | * to specify the name would get the name. In this case, the DHCID RR | |
1586 | * will no longer match the updater's notion of the client-identity of | |
1587 | * the host pointed to by the DNS name. | |
1588 | * -- "Interaction between DHCP and DNS" | |
1589 | */ | |
1590 | ||
1591 | void | |
1592 | ddns_fwd_srv_rem2(dhcp_ddns_cb_t *ddns_cb, | |
1593 | isc_result_t eresult) | |
1594 | { | |
ad06e7ba SR |
1595 | |
1596 | /* | |
1597 | * To get here we have already managed to remove the A/AAAA | |
1598 | * record and are trying to remove the DHCID/TXT record as well. | |
1599 | * On success (removed DHCID/TXT) or YXRRSET (DHCID/TXT still in | |
1600 | * use by something else) we clean up the lease. | |
1601 | * On some other error we don't clean up the lease and hope that | |
1602 | * if we try this again it will work. An example would be if we | |
1603 | * got a timeout as the DNS server halted between the first and | |
1604 | * second steps. The DNS server would still have the DHCID/TXT | |
1605 | * and we would like to remove that in the future. | |
1606 | * | |
1607 | * On success set the EXECUTE_NEXT flag which triggers any | |
1608 | * add that is next in the chain. | |
1609 | */ | |
1610 | if ((eresult == ISC_R_SUCCESS) || | |
1611 | (eresult == DNS_R_YXRRSET)) { | |
98bf1607 | 1612 | ddns_update_lease_text(ddns_cb, NULL); |
ad06e7ba SR |
1613 | eresult = ISC_R_SUCCESS; |
1614 | } | |
98bf1607 | 1615 | |
ad06e7ba SR |
1616 | /* Do the next operation */ |
1617 | if ((ddns_cb->flags & DDNS_UPDATE_PTR) != 0) { | |
1618 | /* if we have zone information get rid of it */ | |
1619 | if (ddns_cb->zone != NULL) { | |
1620 | ddns_cb_forget_zone(ddns_cb); | |
1621 | } | |
98bf1607 | 1622 | |
ad06e7ba SR |
1623 | ddns_cb->state = DDNS_STATE_REM_PTR; |
1624 | ddns_cb->cur_func = ddns_ptr_remove; | |
1625 | if (eresult == ISC_R_SUCCESS) | |
1626 | ddns_cb->flags |= DDNS_EXECUTE_NEXT; | |
1627 | ||
1628 | eresult = ddns_modify_ptr(ddns_cb, MDL); | |
1629 | if (eresult == ISC_R_SUCCESS) { | |
1630 | return; | |
98bf1607 SR |
1631 | } |
1632 | } | |
1633 | ||
beaed73f | 1634 | ddns_update_lease_ptr(NULL, NULL, ddns_cb, NULL, MDL); |
98bf1607 SR |
1635 | ddns_fwd_srv_connector(NULL, NULL, NULL, ddns_cb->next_op, eresult); |
1636 | ddns_cb_free(ddns_cb, MDL); | |
1637 | return; | |
1638 | } | |
1639 | ||
1640 | ||
1641 | /* | |
1642 | * First action routine when trying to remove a fwd | |
1643 | * this will be called after the ddns queries have completed | |
1644 | * if we succeeded in removing the fwd we go to the next step (if any) | |
1645 | * if not we cleanup and leave. | |
1646 | */ | |
1647 | ||
1648 | void | |
1649 | ddns_fwd_srv_rem1(dhcp_ddns_cb_t *ddns_cb, | |
1650 | isc_result_t eresult) | |
1651 | { | |
1652 | isc_result_t result = eresult; | |
beaed73f | 1653 | char ddns_address[MAX_ADDRESS_STRING_LEN]; |
98bf1607 SR |
1654 | |
1655 | switch(eresult) { | |
1656 | case ISC_R_SUCCESS: | |
7aa153b8 SR |
1657 | /* Construct a printable form of the address for logging */ |
1658 | strcpy(ddns_address, piaddr(ddns_cb->address)); | |
1659 | log_info("Removed forward map from %.*s to %s", | |
1660 | (int)ddns_cb->fwd_name.len, | |
1661 | (const char*)ddns_cb->fwd_name.data, | |
1662 | ddns_address); | |
1663 | ||
98bf1607 SR |
1664 | /* Do the second step of the FWD removal */ |
1665 | ddns_cb->state = DDNS_STATE_REM_FW_NXRR; | |
1666 | ddns_cb->cur_func = ddns_fwd_srv_rem2; | |
87132514 | 1667 | result = ddns_modify_fwd(ddns_cb, MDL); |
98bf1607 SR |
1668 | if (result == ISC_R_SUCCESS) { |
1669 | return; | |
1670 | } | |
1671 | break; | |
1672 | ||
1673 | case DNS_R_NXRRSET: | |
1674 | case DNS_R_NXDOMAIN: | |
1675 | ddns_update_lease_text(ddns_cb, NULL); | |
1676 | ||
87132514 SR |
1677 | #if defined (DEBUG_DNS_UPDATES) |
1678 | log_info("DDNS: no forward map to remove. %p", ddns_cb); | |
1679 | #endif | |
1680 | ||
ad06e7ba SR |
1681 | /* Trigger the add operation */ |
1682 | eresult = ISC_R_SUCCESS; | |
1683 | ||
1684 | /* Fall through */ | |
1685 | default: | |
1686 | ||
1687 | /* We do the remove operation in most cases | |
1688 | * but we don't want to continue with adding a forward | |
1689 | * record if the forward removal had issues so we | |
1690 | * check the eresult and set the EXECUTE_NEXT flag on | |
1691 | * success. | |
1692 | */ | |
1693 | ||
1694 | /* Do the remove operation */ | |
98bf1607 SR |
1695 | if ((ddns_cb->flags & DDNS_UPDATE_PTR) != 0) { |
1696 | /* if we have zone information get rid of it */ | |
1697 | if (ddns_cb->zone != NULL) { | |
1698 | ddns_cb_forget_zone(ddns_cb); | |
1699 | } | |
1700 | ||
1701 | ddns_cb->state = DDNS_STATE_REM_PTR; | |
1702 | ddns_cb->cur_func = ddns_ptr_remove; | |
ad06e7ba SR |
1703 | if (eresult == ISC_R_SUCCESS) |
1704 | ddns_cb->flags |= DDNS_EXECUTE_NEXT; | |
1705 | ||
87132514 | 1706 | result = ddns_modify_ptr(ddns_cb, MDL); |
98bf1607 SR |
1707 | if (result == ISC_R_SUCCESS) { |
1708 | return; | |
1709 | } | |
1710 | } | |
98bf1607 SR |
1711 | break; |
1712 | } | |
1713 | ||
beaed73f | 1714 | ddns_update_lease_ptr(NULL, NULL, ddns_cb, NULL, MDL); |
98bf1607 SR |
1715 | ddns_fwd_srv_connector(NULL, NULL, NULL, ddns_cb->next_op, eresult); |
1716 | ddns_cb_free(ddns_cb, MDL); | |
1717 | } | |
1718 | ||
d13db163 | 1719 | /*%< |
98bf1607 SR |
1720 | * Remove relevant entries from DNS. |
1721 | * | |
d13db163 SR |
1722 | * \li lease - lease to start with if this is for v4 |
1723 | * | |
1724 | * \li lease6 - lease to start with if this is for v6 | |
1725 | * | |
1726 | * \li add_ddns_cb - control block for additional DDNS work. This | |
1727 | * is used when the code is going to add a DDNS entry after removing | |
1728 | * the current entry. | |
0ef9a46e | 1729 | * |
d13db163 SR |
1730 | * \li active - indication about the status of the lease. It is |
1731 | * ISC_TRUE if the lease is still active, and FALSE if the lease | |
1732 | * is inactive. This is used to indicate if the lease is inactive or going | |
1733 | * to inactive so we can avoid trying to update the lease with cb pointers | |
1734 | * and text information if it isn't useful. | |
1735 | * | |
1736 | * Returns | |
1737 | * \li #ISC_R_FAILURE - badness occurred and we weren't able to do what was wanted | |
1738 | * \li #ISC_R_SUCCESS - we were able to do stuff but it's in progress | |
1739 | * | |
1740 | * in both cases any additional block has been passed on to it's handler | |
98bf1607 SR |
1741 | */ |
1742 | ||
d13db163 | 1743 | isc_result_t |
98bf1607 SR |
1744 | ddns_removals(struct lease *lease, |
1745 | struct iasubopt *lease6, | |
0ef9a46e SR |
1746 | dhcp_ddns_cb_t *add_ddns_cb, |
1747 | isc_boolean_t active) | |
385fcb27 | 1748 | { |
98bf1607 SR |
1749 | isc_result_t rcode, execute_add = ISC_R_FAILURE; |
1750 | struct binding_scope **scope = NULL; | |
d13db163 | 1751 | isc_result_t result = ISC_R_FAILURE; |
919f1407 | 1752 | dhcp_ddns_cb_t *ddns_cb = NULL; |
98bf1607 | 1753 | struct data_string leaseid; |
b992d7e2 | 1754 | |
919f1407 | 1755 | /* |
d13db163 SR |
1756 | * See if we need to cancel an outstanding request. Mostly this is |
1757 | * used to handle the case where this routine is called twice for | |
1758 | * the same release or abandon event. | |
1759 | * | |
1760 | * When called from the dns code as part of an update request | |
1761 | * (add_ddns_cb != NULL) any outstanding requests will have already | |
1762 | * been cancelled. | |
1763 | * | |
1764 | * If the new request is just a removal and we have an outstanding | |
1765 | * request we have several options: | |
1766 | * | |
1767 | * - we are doing an update or we are doing a removal and the active | |
1768 | * flag has changed from TRUE to FALSE. In these cases we need to | |
1769 | * cancel the old request and start the new one. | |
1770 | * | |
1771 | * - other wise we are doing a removal with the active flag unchanged. | |
1772 | * In this case we can let the current removal continue and do not need | |
1773 | * to start a new one. If the old request included an update to be | |
1774 | * done after the removal we need to kill the update part of the | |
1775 | * request. | |
919f1407 | 1776 | */ |
d13db163 SR |
1777 | |
1778 | if (add_ddns_cb == NULL) { | |
1779 | if ((lease != NULL) && (lease->ddns_cb != NULL)) { | |
1780 | ddns_cb = lease->ddns_cb; | |
1781 | ||
1782 | /* | |
1783 | * Is the old request an update or did the | |
1784 | * the active flag change? | |
1785 | */ | |
1786 | if (((ddns_cb->state == DDNS_STATE_ADD_PTR) || | |
1787 | (ddns_cb->state == DDNS_STATE_ADD_FW_NXDOMAIN) || | |
1788 | (ddns_cb->state == DDNS_STATE_ADD_FW_YXDHCID)) || | |
1789 | ((active == ISC_FALSE) && | |
1790 | ((ddns_cb->flags & DDNS_ACTIVE_LEASE) != 0))) { | |
1791 | /* Cancel the current request */ | |
1792 | ddns_cancel(lease->ddns_cb, MDL); | |
1793 | lease->ddns_cb = NULL; | |
1794 | } else { | |
1795 | /* Remvoval, check and remove updates */ | |
1796 | if (ddns_cb->next_op != NULL) { | |
1797 | ddns_cb_free(ddns_cb->next_op, MDL); | |
1798 | ddns_cb->next_op = NULL; | |
1799 | } | |
1800 | #if defined (DEBUG_DNS_UPDATES) | |
1801 | log_info("DDNS %s(%d): removal already in " | |
1802 | "progress new ddns_cb=%p", | |
1803 | MDL, ddns_cb); | |
1804 | #endif | |
1805 | return (ISC_R_SUCCESS); | |
1806 | } | |
1807 | } else if ((lease6 != NULL) && (lease6->ddns_cb != NULL)) { | |
1808 | ddns_cb = lease6->ddns_cb; | |
1809 | ||
1810 | /* | |
1811 | * Is the old request an update or did the | |
1812 | * the active flag change? | |
1813 | */ | |
1814 | if (((ddns_cb->state == DDNS_STATE_ADD_PTR) || | |
1815 | (ddns_cb->state == DDNS_STATE_ADD_FW_NXDOMAIN) || | |
1816 | (ddns_cb->state == DDNS_STATE_ADD_FW_YXDHCID)) || | |
1817 | ((active == ISC_FALSE) && | |
1818 | ((ddns_cb->flags & DDNS_ACTIVE_LEASE) != 0))) { | |
1819 | /* Cancel the current request */ | |
1820 | ddns_cancel(lease6->ddns_cb, MDL); | |
1821 | lease6->ddns_cb = NULL; | |
1822 | } else { | |
1823 | /* Remvoval, check and remove updates */ | |
1824 | if (ddns_cb->next_op != NULL) { | |
1825 | ddns_cb_free(ddns_cb->next_op, MDL); | |
1826 | ddns_cb->next_op = NULL; | |
1827 | } | |
1828 | #if defined (DEBUG_DNS_UPDATES) | |
1829 | log_info("DDNS %s(%d): removal already in " | |
1830 | "progress new ddns_cb=%p", | |
1831 | MDL, ddns_cb); | |
1832 | #endif | |
1833 | return (ISC_R_SUCCESS); | |
1834 | } | |
1835 | } | |
1836 | ddns_cb = NULL; | |
d208bb04 | 1837 | } |
919f1407 | 1838 | |
98bf1607 SR |
1839 | /* allocate our control block */ |
1840 | ddns_cb = ddns_cb_alloc(MDL); | |
1841 | if (ddns_cb == NULL) { | |
1842 | goto cleanup; | |
1843 | } | |
3221151b SR |
1844 | |
1845 | /* | |
1846 | * For v4 we flag static leases so we don't try | |
1847 | * and manipulate the lease later. For v6 we don't | |
1848 | * get static leases and don't need to flag them. | |
1849 | */ | |
98bd7ca0 DH |
1850 | if (lease != NULL) { |
1851 | scope = &(lease->scope); | |
98bf1607 | 1852 | ddns_cb->address = lease->ip_addr; |
3221151b SR |
1853 | if (lease->flags & STATIC_LEASE) |
1854 | ddns_cb->flags |= DDNS_STATIC_LEASE; | |
98bd7ca0 DH |
1855 | } else if (lease6 != NULL) { |
1856 | scope = &(lease6->scope); | |
98bf1607 SR |
1857 | memcpy(&ddns_cb->address.iabuf, lease6->addr.s6_addr, 16); |
1858 | ddns_cb->address.len = 16; | |
98bd7ca0 | 1859 | } else |
98bf1607 | 1860 | goto cleanup; |
98bd7ca0 | 1861 | |
0ef9a46e SR |
1862 | /* |
1863 | * Set the flag bit if the lease is active, that is it isn't | |
d13db163 SR |
1864 | * expired or released. This is used to determine if we need |
1865 | * to update the scope information for both v4 and v6 and | |
1866 | * the lease information for v6 when the response | |
0ef9a46e SR |
1867 | * from the DNS code is processed. |
1868 | */ | |
1869 | if (active == ISC_TRUE) { | |
1870 | ddns_cb->flags |= DDNS_ACTIVE_LEASE; | |
1871 | } | |
1872 | ||
b992d7e2 | 1873 | /* No scope implies that DDNS has not been performed for this lease. */ |
98bd7ca0 | 1874 | if (*scope == NULL) |
98bf1607 | 1875 | goto cleanup; |
b992d7e2 | 1876 | |
d7d9c0c7 SR |
1877 | if ((ddns_update_style != DDNS_UPDATE_STYLE_STANDARD) && |
1878 | (ddns_update_style != DDNS_UPDATE_STYLE_INTERIM)) | |
98bf1607 SR |
1879 | goto cleanup; |
1880 | ||
1881 | /* Assume that we are removing both records */ | |
3221151b | 1882 | ddns_cb->flags |= DDNS_UPDATE_ADDR | DDNS_UPDATE_PTR; |
98bf1607 SR |
1883 | |
1884 | /* and that we want to do the add call */ | |
1885 | execute_add = ISC_R_SUCCESS; | |
98311e4b | 1886 | |
b992d7e2 DN |
1887 | /* |
1888 | * Look up stored names. | |
1889 | */ | |
b992d7e2 | 1890 | |
b992d7e2 | 1891 | /* |
98bf1607 SR |
1892 | * Find the fwd name and copy it to the control block. If we don't |
1893 | * have it we can't delete the fwd record but we can still try to | |
1894 | * remove the ptr record and cleanup the lease information if the | |
1895 | * client did the fwd update. | |
b992d7e2 | 1896 | */ |
98bf1607 SR |
1897 | if (!find_bound_string(&ddns_cb->fwd_name, *scope, "ddns-fwd-name")) { |
1898 | /* don't try and delete the A, or do the add */ | |
1899 | ddns_cb->flags &= ~DDNS_UPDATE_ADDR; | |
1900 | execute_add = ISC_R_FAILURE; | |
1901 | ||
1902 | /* Check if client did update */ | |
1903 | if (find_bound_string(&ddns_cb->fwd_name, *scope, | |
1904 | "ddns-client-fqdn")) { | |
1905 | ddns_cb->flags |= DDNS_CLIENT_DID_UPDATE; | |
1906 | } | |
b992d7e2 DN |
1907 | } |
1908 | ||
98bf1607 | 1909 | /* |
d7d9c0c7 SR |
1910 | * Find the txt or dhcid tag and copy it to the control block. If we don't |
1911 | * have one this isn't an interim or standard record so we can't delete | |
98bf1607 SR |
1912 | * the A record using this mechanism but we can delete the ptr record. |
1913 | * In this case we will attempt to do any requested next step. | |
1914 | */ | |
1915 | memset(&leaseid, 0, sizeof(leaseid)); | |
d7d9c0c7 SR |
1916 | if (find_bound_string (&leaseid, *scope, ddns_standard_tag)) { |
1917 | /* We have a standard tag */ | |
1918 | ddns_cb->lease_tag = ddns_standard_tag; | |
1919 | ddns_cb->dhcid_class = dns_rdatatype_dhcid; | |
1920 | data_string_copy(&ddns_cb->dhcid, &leaseid, MDL); | |
1921 | data_string_forget(&leaseid, MDL); | |
1922 | } else if (find_bound_string (&leaseid, *scope, ddns_interim_tag)) { | |
1923 | /* we have an interim tag */ | |
1924 | ddns_cb->lease_tag = ddns_interim_tag; | |
1925 | ddns_cb->dhcid_class = dns_rdatatype_txt; | |
98bf1607 SR |
1926 | if (dhcid_fromlease(&ddns_cb->dhcid, &leaseid) != |
1927 | ISC_R_SUCCESS) { | |
1928 | /* We couldn't convert the dhcid from the lease | |
1929 | * version to the dns version. We can't delete | |
1930 | * the A record but can continue to the ptr | |
1931 | */ | |
1932 | ddns_cb->flags &= ~DDNS_UPDATE_ADDR; | |
1933 | } | |
1934 | data_string_forget(&leaseid, MDL); | |
d7d9c0c7 SR |
1935 | } else { |
1936 | ddns_cb->flags &= ~DDNS_UPDATE_ADDR; | |
1937 | } | |
478028e7 | 1938 | |
98bf1607 SR |
1939 | /* |
1940 | * Find the rev name and copy it to the control block. If we don't | |
1941 | * have it we can't get rid of it but we can try to remove the fwd | |
1942 | * pointer if desired. | |
1943 | */ | |
1944 | if (!find_bound_string(&ddns_cb->rev_name, *scope, "ddns-rev-name")) { | |
1945 | ddns_cb->flags &= ~DDNS_UPDATE_PTR; | |
478028e7 | 1946 | } |
98bf1607 SR |
1947 | |
1948 | /* | |
1949 | * If we have a second control block for doing an add | |
1950 | * after the remove finished attach it to our control block. | |
1951 | */ | |
1952 | ddns_cb->next_op = add_ddns_cb; | |
478028e7 | 1953 | |
b992d7e2 | 1954 | /* |
98bf1607 SR |
1955 | * Now that we've collected the information we can try to process it. |
1956 | * If necessary we call an appropriate routine to send a message and | |
1957 | * provide it with an action routine to run on the control block given | |
1958 | * the results of the message. We have three entry points from here, | |
1959 | * one for removing the A record, the next for removing the PTR and | |
1960 | * the third for doing any requested add. | |
b992d7e2 | 1961 | */ |
98bf1607 SR |
1962 | if ((ddns_cb->flags & DDNS_UPDATE_ADDR) != 0) { |
1963 | if (ddns_cb->fwd_name.len != 0) { | |
1964 | ddns_cb->state = DDNS_STATE_REM_FW_YXDHCID; | |
1965 | ddns_cb->cur_func = ddns_fwd_srv_rem1; | |
1966 | ||
87132514 | 1967 | rcode = ddns_modify_fwd(ddns_cb, MDL); |
98bf1607 SR |
1968 | if (rcode == ISC_R_SUCCESS) { |
1969 | ddns_update_lease_ptr(lease, lease6, ddns_cb, | |
beaed73f | 1970 | ddns_cb, MDL); |
d13db163 | 1971 | return (ISC_R_SUCCESS); |
98bf1607 | 1972 | } |
478028e7 | 1973 | |
98bf1607 SR |
1974 | /* |
1975 | * We weren't able to process the request tag the | |
1976 | * add so we won't execute it. | |
1977 | */ | |
1978 | execute_add = ISC_R_FAILURE; | |
1979 | goto cleanup; | |
1980 | } | |
1981 | else { | |
1982 | /*remove info from scope */ | |
1983 | unset(*scope, "ddns-fwd-name"); | |
d7d9c0c7 | 1984 | unset(*scope, ddns_cb->lease_tag); |
98bf1607 SR |
1985 | } |
1986 | } | |
b992d7e2 | 1987 | |
98bf1607 SR |
1988 | if ((ddns_cb->flags & DDNS_UPDATE_PTR) != 0) { |
1989 | ddns_cb->state = DDNS_STATE_REM_PTR; | |
1990 | ddns_cb->cur_func = ddns_ptr_remove; | |
ad06e7ba | 1991 | ddns_cb->flags |= DDNS_EXECUTE_NEXT; |
98bf1607 SR |
1992 | |
1993 | /* | |
1994 | * if execute add isn't success remove the control block so | |
1995 | * it won't be processed when the remove completes. We | |
1996 | * also arrange to clean it up and get rid of it. | |
1997 | */ | |
1998 | if (execute_add != ISC_R_SUCCESS) { | |
1999 | ddns_cb->next_op = NULL; | |
2000 | ddns_fwd_srv_connector(lease, lease6, scope, | |
2001 | add_ddns_cb, execute_add); | |
2002 | add_ddns_cb = NULL; | |
2003 | } | |
2004 | else { | |
d13db163 | 2005 | result = ISC_R_SUCCESS; |
98bf1607 SR |
2006 | } |
2007 | ||
87132514 | 2008 | rcode = ddns_modify_ptr(ddns_cb, MDL); |
98bf1607 | 2009 | if (rcode == ISC_R_SUCCESS) { |
beaed73f SR |
2010 | ddns_update_lease_ptr(lease, lease6, ddns_cb, ddns_cb, |
2011 | MDL); | |
d13db163 | 2012 | return (result); |
98bf1607 SR |
2013 | } |
2014 | ||
2015 | /* We weren't able to process the request tag the | |
2016 | * add so we won't execute it */ | |
2017 | execute_add = ISC_R_FAILURE; | |
2018 | goto cleanup; | |
2019 | } | |
2020 | ||
2021 | cleanup: | |
2022 | /* | |
2023 | * We've gotten here because we didn't need to send a message or | |
2024 | * we failed when trying to do so. We send the additional cb | |
2025 | * off to handle sending and/or cleanup and cleanup anything | |
2026 | * we allocated here. | |
2027 | */ | |
2028 | ddns_fwd_srv_connector(lease, lease6, scope, add_ddns_cb, execute_add); | |
919f1407 SR |
2029 | if (ddns_cb != NULL) |
2030 | ddns_cb_free(ddns_cb, MDL); | |
98bf1607 | 2031 | |
d13db163 | 2032 | return (result); |
b992d7e2 DN |
2033 | } |
2034 | ||
b992d7e2 | 2035 | #endif /* NSUPDATE */ |