]>
Commit | Line | Data |
---|---|---|
011feef8 PF |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2013 Intel Corporation. All rights reserved. | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
011feef8 | 20 | #include <errno.h> |
46a66b79 | 21 | #include <net/ethernet.h> |
3b7ca119 | 22 | #include <net/if_arp.h> |
07630cea LP |
23 | #include <stdio.h> |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
5266a81e | 26 | #include <sys/ioctl.h> |
07630cea | 27 | #include <linux/if_infiniband.h> |
011feef8 | 28 | |
07630cea | 29 | #include "sd-dhcp-client.h" |
011feef8 | 30 | |
b5efdb8a | 31 | #include "alloc-util.h" |
07630cea LP |
32 | #include "async.h" |
33 | #include "dhcp-identifier.h" | |
46a66b79 | 34 | #include "dhcp-internal.h" |
fe8db0c5 | 35 | #include "dhcp-lease-internal.h" |
07630cea LP |
36 | #include "dhcp-protocol.h" |
37 | #include "random-util.h" | |
38 | #include "string-util.h" | |
39 | #include "util.h" | |
011feef8 | 40 | |
5bac5235 | 41 | #define MAX_CLIENT_ID_LEN (sizeof(uint32_t) + MAX_DUID_LEN) /* Arbitrary limit */ |
dd168445 | 42 | #define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN) |
76253e73 | 43 | |
011feef8 | 44 | struct sd_dhcp_client { |
3733eec3 | 45 | unsigned n_ref; |
e5b04c8d | 46 | |
011feef8 | 47 | DHCPState state; |
d3d8ac2f | 48 | sd_event *event; |
b25ef18b | 49 | int event_priority; |
d3d8ac2f | 50 | sd_event_source *timeout_resend; |
011feef8 | 51 | int index; |
8c00042c PF |
52 | int fd; |
53 | union sockaddr_union link; | |
54 | sd_event_source *receive_message; | |
f5de5b00 | 55 | bool request_broadcast; |
011feef8 | 56 | uint8_t *req_opts; |
7a7c74ca | 57 | size_t req_opts_allocated; |
011feef8 | 58 | size_t req_opts_size; |
3b349af6 | 59 | be32_t last_addr; |
76253e73 DW |
60 | uint8_t mac_addr[MAX_MAC_ADDR_LEN]; |
61 | size_t mac_addr_len; | |
62 | uint16_t arp_type; | |
5bac5235 TG |
63 | struct { |
64 | uint8_t type; | |
65 | union { | |
66 | struct { | |
67 | /* 0: Generic (non-LL) (RFC 2132) */ | |
68 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
69 | } _packed_ gen; | |
70 | struct { | |
71 | /* 1: Ethernet Link-Layer (RFC 2132) */ | |
72 | uint8_t haddr[ETH_ALEN]; | |
73 | } _packed_ eth; | |
74 | struct { | |
75 | /* 2 - 254: ARP/Link-Layer (RFC 2132) */ | |
76 | uint8_t haddr[0]; | |
77 | } _packed_ ll; | |
78 | struct { | |
79 | /* 255: Node-specific (RFC 4361) */ | |
80 | uint32_t iaid; | |
81 | struct duid duid; | |
82 | } _packed_ ns; | |
83 | struct { | |
84 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
85 | } _packed_ raw; | |
86 | }; | |
87 | } _packed_ client_id; | |
ba6c0fd6 | 88 | size_t client_id_len; |
4cc7a82c | 89 | char *hostname; |
edb85f0d | 90 | char *vendor_class_identifier; |
324f8187 | 91 | uint32_t mtu; |
46a66b79 | 92 | uint32_t xid; |
d3d8ac2f | 93 | usec_t start_time; |
e2dfc79f | 94 | unsigned int attempt; |
51debc1e PF |
95 | usec_t request_sent; |
96 | sd_event_source *timeout_t1; | |
97 | sd_event_source *timeout_t2; | |
98 | sd_event_source *timeout_expire; | |
751246ee PF |
99 | sd_dhcp_client_cb_t cb; |
100 | void *userdata; | |
a6cc569e | 101 | sd_dhcp_lease *lease; |
011feef8 PF |
102 | }; |
103 | ||
104 | static const uint8_t default_req_opts[] = { | |
105 | DHCP_OPTION_SUBNET_MASK, | |
106 | DHCP_OPTION_ROUTER, | |
107 | DHCP_OPTION_HOST_NAME, | |
108 | DHCP_OPTION_DOMAIN_NAME, | |
109 | DHCP_OPTION_DOMAIN_NAME_SERVER, | |
011feef8 PF |
110 | }; |
111 | ||
e5002702 TG |
112 | static int client_receive_message_raw(sd_event_source *s, int fd, |
113 | uint32_t revents, void *userdata); | |
114 | static int client_receive_message_udp(sd_event_source *s, int fd, | |
115 | uint32_t revents, void *userdata); | |
574cc928 | 116 | static void client_stop(sd_dhcp_client *client, int error); |
aba26854 | 117 | |
751246ee | 118 | int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb, |
5ee482df | 119 | void *userdata) { |
751246ee PF |
120 | assert_return(client, -EINVAL); |
121 | ||
122 | client->cb = cb; | |
123 | client->userdata = userdata; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
f5de5b00 TG |
128 | int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) { |
129 | assert_return(client, -EINVAL); | |
130 | ||
131 | client->request_broadcast = !!broadcast; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
5ee482df | 136 | int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) { |
011feef8 PF |
137 | size_t i; |
138 | ||
139 | assert_return(client, -EINVAL); | |
781ca7a1 PF |
140 | assert_return (IN_SET(client->state, DHCP_STATE_INIT, |
141 | DHCP_STATE_STOPPED), -EBUSY); | |
011feef8 PF |
142 | |
143 | switch(option) { | |
144 | case DHCP_OPTION_PAD: | |
145 | case DHCP_OPTION_OVERLOAD: | |
146 | case DHCP_OPTION_MESSAGE_TYPE: | |
147 | case DHCP_OPTION_PARAMETER_REQUEST_LIST: | |
148 | case DHCP_OPTION_END: | |
149 | return -EINVAL; | |
150 | ||
151 | default: | |
152 | break; | |
153 | } | |
154 | ||
155 | for (i = 0; i < client->req_opts_size; i++) | |
156 | if (client->req_opts[i] == option) | |
157 | return -EEXIST; | |
158 | ||
7a7c74ca | 159 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, |
011feef8 PF |
160 | client->req_opts_size + 1)) |
161 | return -ENOMEM; | |
162 | ||
7a7c74ca | 163 | client->req_opts[client->req_opts_size++] = option; |
011feef8 PF |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
168 | int sd_dhcp_client_set_request_address(sd_dhcp_client *client, | |
5ee482df | 169 | const struct in_addr *last_addr) { |
011feef8 | 170 | assert_return(client, -EINVAL); |
781ca7a1 PF |
171 | assert_return (IN_SET(client->state, DHCP_STATE_INIT, |
172 | DHCP_STATE_STOPPED), -EBUSY); | |
011feef8 PF |
173 | |
174 | if (last_addr) | |
175 | client->last_addr = last_addr->s_addr; | |
176 | else | |
177 | client->last_addr = INADDR_ANY; | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
5ee482df | 182 | int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) { |
011feef8 | 183 | assert_return(client, -EINVAL); |
781ca7a1 PF |
184 | assert_return (IN_SET(client->state, DHCP_STATE_INIT, |
185 | DHCP_STATE_STOPPED), -EBUSY); | |
d9bf4f8c | 186 | assert_return(interface_index > 0, -EINVAL); |
011feef8 PF |
187 | |
188 | client->index = interface_index; | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
76253e73 DW |
193 | int sd_dhcp_client_set_mac(sd_dhcp_client *client, const uint8_t *addr, |
194 | size_t addr_len, uint16_t arp_type) { | |
574cc928 | 195 | DHCP_CLIENT_DONT_DESTROY(client); |
4644fee0 TG |
196 | bool need_restart = false; |
197 | ||
46a66b79 | 198 | assert_return(client, -EINVAL); |
4644fee0 | 199 | assert_return(addr, -EINVAL); |
76253e73 DW |
200 | assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); |
201 | assert_return(arp_type > 0, -EINVAL); | |
202 | ||
203 | if (arp_type == ARPHRD_ETHER) | |
204 | assert_return(addr_len == ETH_ALEN, -EINVAL); | |
205 | else if (arp_type == ARPHRD_INFINIBAND) | |
206 | assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); | |
207 | else | |
208 | return -EINVAL; | |
46a66b79 | 209 | |
76253e73 DW |
210 | if (client->mac_addr_len == addr_len && |
211 | memcmp(&client->mac_addr, addr, addr_len) == 0) | |
4644fee0 TG |
212 | return 0; |
213 | ||
781ca7a1 | 214 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { |
4644fee0 TG |
215 | log_dhcp_client(client, "Changing MAC address on running DHCP " |
216 | "client, restarting"); | |
4644fee0 | 217 | need_restart = true; |
03748142 | 218 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
4644fee0 | 219 | } |
02ec5cd7 | 220 | |
76253e73 DW |
221 | memcpy(&client->mac_addr, addr, addr_len); |
222 | client->mac_addr_len = addr_len; | |
223 | client->arp_type = arp_type; | |
224 | ||
ba6c0fd6 DW |
225 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
226 | sd_dhcp_client_start(client); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | int sd_dhcp_client_get_client_id(sd_dhcp_client *client, uint8_t *type, | |
232 | const uint8_t **data, size_t *data_len) { | |
233 | ||
234 | assert_return(client, -EINVAL); | |
235 | assert_return(type, -EINVAL); | |
236 | assert_return(data, -EINVAL); | |
237 | assert_return(data_len, -EINVAL); | |
238 | ||
239 | *type = 0; | |
240 | *data = NULL; | |
241 | *data_len = 0; | |
242 | if (client->client_id_len) { | |
5bac5235 | 243 | *type = client->client_id.type; |
ba6c0fd6 | 244 | *data = client->client_id.raw.data; |
5bac5235 | 245 | *data_len = client->client_id_len - sizeof(client->client_id.type); |
ba6c0fd6 DW |
246 | } |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | int sd_dhcp_client_set_client_id(sd_dhcp_client *client, uint8_t type, | |
252 | const uint8_t *data, size_t data_len) { | |
253 | DHCP_CLIENT_DONT_DESTROY(client); | |
254 | bool need_restart = false; | |
255 | ||
256 | assert_return(client, -EINVAL); | |
257 | assert_return(data, -EINVAL); | |
258 | assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL); | |
259 | ||
260 | switch (type) { | |
261 | case ARPHRD_ETHER: | |
262 | if (data_len != ETH_ALEN) | |
263 | return -EINVAL; | |
264 | break; | |
265 | case ARPHRD_INFINIBAND: | |
266 | if (data_len != INFINIBAND_ALEN) | |
267 | return -EINVAL; | |
268 | break; | |
269 | default: | |
270 | break; | |
271 | } | |
272 | ||
5bac5235 TG |
273 | if (client->client_id_len == data_len + sizeof(client->client_id.type) && |
274 | client->client_id.type == type && | |
ba6c0fd6 DW |
275 | memcmp(&client->client_id.raw.data, data, data_len) == 0) |
276 | return 0; | |
277 | ||
278 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { | |
279 | log_dhcp_client(client, "Changing client ID on running DHCP " | |
280 | "client, restarting"); | |
281 | need_restart = true; | |
03748142 | 282 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
ba6c0fd6 DW |
283 | } |
284 | ||
5bac5235 | 285 | client->client_id.type = type; |
ba6c0fd6 | 286 | memcpy(&client->client_id.raw.data, data, data_len); |
5bac5235 | 287 | client->client_id_len = data_len + sizeof (client->client_id.type); |
46a66b79 | 288 | |
781ca7a1 | 289 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
4644fee0 TG |
290 | sd_dhcp_client_start(client); |
291 | ||
46a66b79 PF |
292 | return 0; |
293 | } | |
294 | ||
4cc7a82c EY |
295 | int sd_dhcp_client_set_hostname(sd_dhcp_client *client, |
296 | const char *hostname) { | |
297 | char *new_hostname = NULL; | |
298 | ||
299 | assert_return(client, -EINVAL); | |
300 | ||
301 | if (streq_ptr(client->hostname, hostname)) | |
302 | return 0; | |
303 | ||
304 | if (hostname) { | |
305 | new_hostname = strdup(hostname); | |
306 | if (!new_hostname) | |
307 | return -ENOMEM; | |
308 | } | |
309 | ||
310 | free(client->hostname); | |
311 | client->hostname = new_hostname; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
edb85f0d SS |
316 | int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client, |
317 | const char *vci) { | |
318 | char *new_vci = NULL; | |
319 | ||
320 | assert_return(client, -EINVAL); | |
321 | ||
322 | new_vci = strdup(vci); | |
323 | if (!new_vci) | |
324 | return -ENOMEM; | |
325 | ||
326 | free(client->vendor_class_identifier); | |
327 | ||
328 | client->vendor_class_identifier = new_vci; | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
324f8187 TG |
333 | int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) { |
334 | assert_return(client, -EINVAL); | |
335 | assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE); | |
336 | ||
337 | client->mtu = mtu; | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
a6cc569e | 342 | int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) { |
751246ee | 343 | assert_return(client, -EINVAL); |
a6cc569e | 344 | assert_return(ret, -EINVAL); |
751246ee | 345 | |
a6cc569e TG |
346 | if (client->state != DHCP_STATE_BOUND && |
347 | client->state != DHCP_STATE_RENEWING && | |
348 | client->state != DHCP_STATE_REBINDING) | |
349 | return -EADDRNOTAVAIL; | |
751246ee | 350 | |
e6b18ffa | 351 | *ret = client->lease; |
4f882b2a TG |
352 | |
353 | return 0; | |
354 | } | |
355 | ||
574cc928 TG |
356 | static void client_notify(sd_dhcp_client *client, int event) { |
357 | if (client->cb) | |
751246ee | 358 | client->cb(client, event, client->userdata); |
3e3d8f78 PF |
359 | } |
360 | ||
0f941add | 361 | static int client_initialize(sd_dhcp_client *client) { |
bbdf06d9 | 362 | assert_return(client, -EINVAL); |
bbdf06d9 | 363 | |
8c00042c PF |
364 | client->receive_message = |
365 | sd_event_source_unref(client->receive_message); | |
366 | ||
22fc2420 | 367 | client->fd = asynchronous_close(client->fd); |
8c00042c | 368 | |
d3d8ac2f PF |
369 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
370 | ||
51debc1e PF |
371 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); |
372 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
373 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
374 | ||
e2dfc79f PF |
375 | client->attempt = 1; |
376 | ||
f8fdefe4 | 377 | client->state = DHCP_STATE_INIT; |
0f941add | 378 | client->xid = 0; |
bbdf06d9 | 379 | |
0339cd77 | 380 | client->lease = sd_dhcp_lease_unref(client->lease); |
8c00042c | 381 | |
0f941add PF |
382 | return 0; |
383 | } | |
384 | ||
574cc928 TG |
385 | static void client_stop(sd_dhcp_client *client, int error) { |
386 | assert(client); | |
0f941add | 387 | |
ccfdc9a1 UTL |
388 | if (error < 0) |
389 | log_dhcp_client(client, "STOPPED: %s", strerror(-error)); | |
03748142 | 390 | else if (error == SD_DHCP_CLIENT_EVENT_STOP) |
2d2349cc TG |
391 | log_dhcp_client(client, "STOPPED"); |
392 | else | |
393 | log_dhcp_client(client, "STOPPED: Unknown event"); | |
0f941add | 394 | |
574cc928 | 395 | client_notify(client, error); |
ee57a737 | 396 | |
574cc928 | 397 | client_initialize(client); |
bbdf06d9 PF |
398 | } |
399 | ||
424a8732 TG |
400 | static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret, |
401 | uint8_t type, size_t *_optlen, size_t *_optoffset) { | |
402 | _cleanup_free_ DHCPPacket *packet; | |
403 | size_t optlen, optoffset, size; | |
8a9e7616 | 404 | be16_t max_size; |
d8d74ef0 DW |
405 | usec_t time_now; |
406 | uint16_t secs; | |
cf597f65 | 407 | int r; |
46a66b79 | 408 | |
6236f49b | 409 | assert(client); |
d8d74ef0 | 410 | assert(client->start_time); |
424a8732 TG |
411 | assert(ret); |
412 | assert(_optlen); | |
413 | assert(_optoffset); | |
8a9e7616 | 414 | assert(type == DHCP_DISCOVER || type == DHCP_REQUEST); |
0a1b6da8 | 415 | |
424a8732 TG |
416 | optlen = DHCP_MIN_OPTIONS_SIZE; |
417 | size = sizeof(DHCPPacket) + optlen; | |
418 | ||
419 | packet = malloc0(size); | |
420 | if (!packet) | |
421 | return -ENOMEM; | |
422 | ||
423 | r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type, | |
76253e73 | 424 | client->arp_type, optlen, &optoffset); |
cf597f65 TG |
425 | if (r < 0) |
426 | return r; | |
46a66b79 | 427 | |
0a1b6da8 TG |
428 | /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers |
429 | refuse to issue an DHCP lease if 'secs' is set to zero */ | |
d8d74ef0 DW |
430 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
431 | if (r < 0) | |
432 | return r; | |
433 | assert(time_now >= client->start_time); | |
434 | ||
435 | /* seconds between sending first and last DISCOVER | |
436 | * must always be strictly positive to deal with broken servers */ | |
437 | secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1; | |
438 | packet->dhcp.secs = htobe16(secs); | |
0a1b6da8 | 439 | |
63a07041 CA |
440 | /* RFC2132 section 4.1 |
441 | A client that cannot receive unicast IP datagrams until its protocol | |
442 | software has been configured with an IP address SHOULD set the | |
443 | BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or | |
444 | DHCPREQUEST messages that client sends. The BROADCAST bit will | |
445 | provide a hint to the DHCP server and BOOTP relay agent to broadcast | |
f5de5b00 TG |
446 | any messages to the client on the client's subnet. |
447 | ||
448 | Note: some interfaces needs this to be enabled, but some networks | |
449 | needs this to be disabled as broadcasts are filteretd, so this | |
450 | needs to be configurable */ | |
76253e73 | 451 | if (client->request_broadcast || client->arp_type != ARPHRD_ETHER) |
f5de5b00 | 452 | packet->dhcp.flags = htobe16(0x8000); |
63a07041 | 453 | |
50d6810e TG |
454 | /* RFC2132 section 4.1.1: |
455 | The client MUST include its hardware address in the ’chaddr’ field, if | |
76253e73 DW |
456 | necessary for delivery of DHCP reply messages. Non-Ethernet |
457 | interfaces will leave 'chaddr' empty and use the client identifier | |
458 | instead (eg, RFC 4390 section 2.1). | |
50d6810e | 459 | */ |
76253e73 DW |
460 | if (client->arp_type == ARPHRD_ETHER) |
461 | memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN); | |
f5a70de7 | 462 | |
5bac5235 TG |
463 | /* If no client identifier exists, construct an RFC 4361-compliant one */ |
464 | if (client->client_id_len == 0) { | |
465 | size_t duid_len; | |
466 | ||
467 | client->client_id.type = 255; | |
468 | ||
469 | r = dhcp_identifier_set_iaid(client->index, client->mac_addr, client->mac_addr_len, &client->client_id.ns.iaid); | |
470 | if (r < 0) | |
471 | return r; | |
472 | ||
473 | r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &duid_len); | |
474 | if (r < 0) | |
475 | return r; | |
476 | ||
477 | client->client_id_len = sizeof(client->client_id.type) + sizeof(client->client_id.ns.iaid) + duid_len; | |
ba6c0fd6 DW |
478 | } |
479 | ||
ee57a737 | 480 | /* Some DHCP servers will refuse to issue an DHCP lease if the Client |
46a66b79 | 481 | Identifier option is not set */ |
ba6c0fd6 DW |
482 | if (client->client_id_len) { |
483 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, | |
484 | DHCP_OPTION_CLIENT_IDENTIFIER, | |
485 | client->client_id_len, | |
5bac5235 | 486 | &client->client_id); |
ba6c0fd6 DW |
487 | if (r < 0) |
488 | return r; | |
489 | } | |
50d6810e TG |
490 | |
491 | /* RFC2131 section 3.5: | |
492 | in its initial DHCPDISCOVER or DHCPREQUEST message, a | |
493 | client may provide the server with a list of specific | |
494 | parameters the client is interested in. If the client | |
495 | includes a list of parameters in a DHCPDISCOVER message, | |
496 | it MUST include that list in any subsequent DHCPREQUEST | |
497 | messages. | |
498 | */ | |
424a8732 | 499 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, |
8a9e7616 | 500 | DHCP_OPTION_PARAMETER_REQUEST_LIST, |
20b958bf | 501 | client->req_opts_size, client->req_opts); |
8a9e7616 TG |
502 | if (r < 0) |
503 | return r; | |
504 | ||
50d6810e TG |
505 | /* RFC2131 section 3.5: |
506 | The client SHOULD include the ’maximum DHCP message size’ option to | |
507 | let the server know how large the server may make its DHCP messages. | |
508 | ||
509 | Note (from ConnMan): Some DHCP servers will send bigger DHCP packets | |
510 | than the defined default size unless the Maximum Messge Size option | |
f131770b | 511 | is explicitly set |
324f8187 TG |
512 | |
513 | RFC3442 "Requirements to Avoid Sizing Constraints": | |
514 | Because a full routing table can be quite large, the standard 576 | |
515 | octet maximum size for a DHCP message may be too short to contain | |
516 | some legitimate Classless Static Route options. Because of this, | |
517 | clients implementing the Classless Static Route option SHOULD send a | |
518 | Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP | |
519 | stack is capable of receiving larger IP datagrams. In this case, the | |
520 | client SHOULD set the value of this option to at least the MTU of the | |
521 | interface that the client is configuring. The client MAY set the | |
522 | value of this option higher, up to the size of the largest UDP packet | |
523 | it is prepared to accept. (Note that the value specified in the | |
524 | Maximum DHCP Message Size option is the total maximum packet size, | |
525 | including IP and UDP headers.) | |
50d6810e | 526 | */ |
424a8732 | 527 | max_size = htobe16(size); |
324f8187 | 528 | r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0, |
8a9e7616 TG |
529 | DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, |
530 | 2, &max_size); | |
531 | if (r < 0) | |
532 | return r; | |
46a66b79 | 533 | |
424a8732 TG |
534 | *_optlen = optlen; |
535 | *_optoffset = optoffset; | |
536 | *ret = packet; | |
537 | packet = NULL; | |
538 | ||
46a66b79 PF |
539 | return 0; |
540 | } | |
541 | ||
63edaa62 TG |
542 | static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet, |
543 | size_t len) { | |
544 | dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT, | |
545 | INADDR_BROADCAST, DHCP_PORT_SERVER, len); | |
546 | ||
547 | return dhcp_network_send_raw_socket(client->fd, &client->link, | |
548 | packet, len); | |
549 | } | |
550 | ||
6236f49b | 551 | static int client_send_discover(sd_dhcp_client *client) { |
9f2a50a3 | 552 | _cleanup_free_ DHCPPacket *discover = NULL; |
424a8732 | 553 | size_t optoffset, optlen; |
6236f49b TG |
554 | int r; |
555 | ||
556 | assert(client); | |
50d6810e TG |
557 | assert(client->state == DHCP_STATE_INIT || |
558 | client->state == DHCP_STATE_SELECTING); | |
559 | ||
424a8732 TG |
560 | r = client_message_init(client, &discover, DHCP_DISCOVER, |
561 | &optlen, &optoffset); | |
6236f49b TG |
562 | if (r < 0) |
563 | return r; | |
46a66b79 | 564 | |
50d6810e TG |
565 | /* the client may suggest values for the network address |
566 | and lease time in the DHCPDISCOVER message. The client may include | |
567 | the ’requested IP address’ option to suggest that a particular IP | |
568 | address be assigned, and may include the ’IP address lease time’ | |
569 | option to suggest the lease time it would like. | |
570 | */ | |
46a66b79 | 571 | if (client->last_addr != INADDR_ANY) { |
04b28be1 | 572 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
20b958bf TG |
573 | DHCP_OPTION_REQUESTED_IP_ADDRESS, |
574 | 4, &client->last_addr); | |
6236f49b TG |
575 | if (r < 0) |
576 | return r; | |
46a66b79 PF |
577 | } |
578 | ||
4cc7a82c EY |
579 | /* it is unclear from RFC 2131 if client should send hostname in |
580 | DHCPDISCOVER but dhclient does and so we do as well | |
581 | */ | |
582 | if (client->hostname) { | |
583 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
584 | DHCP_OPTION_HOST_NAME, | |
585 | strlen(client->hostname), client->hostname); | |
586 | if (r < 0) | |
587 | return r; | |
588 | } | |
589 | ||
edb85f0d SS |
590 | if (client->vendor_class_identifier) { |
591 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
592 | DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, | |
593 | strlen(client->vendor_class_identifier), | |
594 | client->vendor_class_identifier); | |
595 | if (r < 0) | |
596 | return r; | |
597 | } | |
598 | ||
04b28be1 | 599 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
20b958bf | 600 | DHCP_OPTION_END, 0, NULL); |
f7926298 TA |
601 | if (r < 0) |
602 | return r; | |
46a66b79 | 603 | |
50d6810e TG |
604 | /* We currently ignore: |
605 | The client SHOULD wait a random time between one and ten seconds to | |
606 | desynchronize the use of DHCP at startup. | |
607 | */ | |
20b958bf | 608 | r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset); |
6236f49b TG |
609 | if (r < 0) |
610 | return r; | |
e2dfc79f | 611 | |
ee57a737 TG |
612 | log_dhcp_client(client, "DISCOVER"); |
613 | ||
63edaa62 | 614 | return 0; |
e2dfc79f PF |
615 | } |
616 | ||
6236f49b | 617 | static int client_send_request(sd_dhcp_client *client) { |
8186d9dd | 618 | _cleanup_free_ DHCPPacket *request = NULL; |
424a8732 | 619 | size_t optoffset, optlen; |
6236f49b | 620 | int r; |
e2dfc79f | 621 | |
424a8732 TG |
622 | r = client_message_init(client, &request, DHCP_REQUEST, |
623 | &optlen, &optoffset); | |
6236f49b TG |
624 | if (r < 0) |
625 | return r; | |
46a66b79 | 626 | |
8b1243f7 | 627 | switch (client->state) { |
50d6810e TG |
628 | /* See RFC2131 section 4.3.2 (note that there is a typo in the RFC, |
629 | SELECTING should be REQUESTING) | |
630 | */ | |
631 | ||
632 | case DHCP_STATE_REQUESTING: | |
633 | /* Client inserts the address of the selected server in ’server | |
634 | identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be | |
635 | filled in with the yiaddr value from the chosen DHCPOFFER. | |
636 | */ | |
8b1243f7 | 637 | |
04b28be1 | 638 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
50d6810e TG |
639 | DHCP_OPTION_SERVER_IDENTIFIER, |
640 | 4, &client->lease->server_address); | |
6236f49b TG |
641 | if (r < 0) |
642 | return r; | |
8b1243f7 | 643 | |
04b28be1 | 644 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
6236f49b TG |
645 | DHCP_OPTION_REQUESTED_IP_ADDRESS, |
646 | 4, &client->lease->address); | |
647 | if (r < 0) | |
648 | return r; | |
649 | ||
50d6810e TG |
650 | break; |
651 | ||
652 | case DHCP_STATE_INIT_REBOOT: | |
653 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ | |
654 | option MUST be filled in with client’s notion of its previously | |
655 | assigned address. ’ciaddr’ MUST be zero. | |
656 | */ | |
04b28be1 | 657 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
50d6810e TG |
658 | DHCP_OPTION_REQUESTED_IP_ADDRESS, |
659 | 4, &client->last_addr); | |
6236f49b TG |
660 | if (r < 0) |
661 | return r; | |
8b1243f7 PF |
662 | break; |
663 | ||
8b1243f7 | 664 | case DHCP_STATE_RENEWING: |
50d6810e TG |
665 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
666 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
667 | client’s IP address. | |
668 | */ | |
669 | ||
670 | /* fall through */ | |
8b1243f7 | 671 | case DHCP_STATE_REBINDING: |
50d6810e TG |
672 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
673 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
674 | client’s IP address. | |
675 | ||
676 | This message MUST be broadcast to the 0xffffffff IP broadcast address. | |
677 | */ | |
678 | request->dhcp.ciaddr = client->lease->address; | |
8b1243f7 PF |
679 | |
680 | break; | |
781ca7a1 | 681 | |
50d6810e TG |
682 | case DHCP_STATE_INIT: |
683 | case DHCP_STATE_SELECTING: | |
684 | case DHCP_STATE_REBOOTING: | |
685 | case DHCP_STATE_BOUND: | |
781ca7a1 PF |
686 | case DHCP_STATE_STOPPED: |
687 | return -EINVAL; | |
e2dfc79f | 688 | } |
46a66b79 | 689 | |
4cc7a82c EY |
690 | if (client->hostname) { |
691 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, | |
692 | DHCP_OPTION_HOST_NAME, | |
693 | strlen(client->hostname), client->hostname); | |
694 | if (r < 0) | |
695 | return r; | |
696 | } | |
697 | ||
04b28be1 | 698 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
20b958bf | 699 | DHCP_OPTION_END, 0, NULL); |
6236f49b TG |
700 | if (r < 0) |
701 | return r; | |
46a66b79 | 702 | |
aba26854 | 703 | if (client->state == DHCP_STATE_RENEWING) { |
6236f49b TG |
704 | r = dhcp_network_send_udp_socket(client->fd, |
705 | client->lease->server_address, | |
706 | DHCP_PORT_SERVER, | |
707 | &request->dhcp, | |
20b958bf | 708 | sizeof(DHCPMessage) + optoffset); |
aba26854 | 709 | } else { |
20b958bf | 710 | r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset); |
aba26854 | 711 | } |
6236f49b TG |
712 | if (r < 0) |
713 | return r; | |
46a66b79 | 714 | |
998d8047 TG |
715 | switch (client->state) { |
716 | case DHCP_STATE_REQUESTING: | |
717 | log_dhcp_client(client, "REQUEST (requesting)"); | |
718 | break; | |
719 | case DHCP_STATE_INIT_REBOOT: | |
720 | log_dhcp_client(client, "REQUEST (init-reboot)"); | |
721 | break; | |
722 | case DHCP_STATE_RENEWING: | |
723 | log_dhcp_client(client, "REQUEST (renewing)"); | |
724 | break; | |
725 | case DHCP_STATE_REBINDING: | |
726 | log_dhcp_client(client, "REQUEST (rebinding)"); | |
727 | break; | |
728 | default: | |
729 | log_dhcp_client(client, "REQUEST (invalid)"); | |
730 | break; | |
731 | } | |
ee57a737 | 732 | |
63edaa62 | 733 | return 0; |
46a66b79 PF |
734 | } |
735 | ||
7739a40b TG |
736 | static int client_start(sd_dhcp_client *client); |
737 | ||
d3d8ac2f | 738 | static int client_timeout_resend(sd_event_source *s, uint64_t usec, |
5ee482df | 739 | void *userdata) { |
d3d8ac2f | 740 | sd_dhcp_client *client = userdata; |
574cc928 | 741 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 | 742 | usec_t next_timeout = 0; |
d23c45bf | 743 | uint64_t time_now; |
aba26854 | 744 | uint32_t time_left; |
d23c45bf | 745 | int r; |
b25ef18b TG |
746 | |
747 | assert(s); | |
748 | assert(client); | |
749 | assert(client->event); | |
d3d8ac2f | 750 | |
fa94c34b | 751 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d23c45bf TG |
752 | if (r < 0) |
753 | goto error; | |
754 | ||
aba26854 PF |
755 | switch (client->state) { |
756 | case DHCP_STATE_RENEWING: | |
757 | ||
e5002702 | 758 | time_left = (client->lease->t2 - client->lease->t1) / 2; |
aba26854 PF |
759 | if (time_left < 60) |
760 | time_left = 60; | |
d3d8ac2f | 761 | |
d23c45bf | 762 | next_timeout = time_now + time_left * USEC_PER_SEC; |
d3d8ac2f | 763 | |
aba26854 PF |
764 | break; |
765 | ||
3dd71400 PF |
766 | case DHCP_STATE_REBINDING: |
767 | ||
e5002702 | 768 | time_left = (client->lease->lifetime - client->lease->t2) / 2; |
3dd71400 PF |
769 | if (time_left < 60) |
770 | time_left = 60; | |
771 | ||
d23c45bf | 772 | next_timeout = time_now + time_left * USEC_PER_SEC; |
3dd71400 PF |
773 | break; |
774 | ||
8b1243f7 PF |
775 | case DHCP_STATE_REBOOTING: |
776 | /* start over as we did not receive a timely ack or nak */ | |
7739a40b | 777 | r = client_initialize(client); |
eb105b96 TG |
778 | if (r < 0) |
779 | goto error; | |
8b1243f7 | 780 | |
998d8047 TG |
781 | r = client_start(client); |
782 | if (r < 0) | |
783 | goto error; | |
784 | else { | |
785 | log_dhcp_client(client, "REBOOTED"); | |
786 | return 0; | |
787 | } | |
7739a40b | 788 | |
aba26854 PF |
789 | case DHCP_STATE_INIT: |
790 | case DHCP_STATE_INIT_REBOOT: | |
aba26854 PF |
791 | case DHCP_STATE_SELECTING: |
792 | case DHCP_STATE_REQUESTING: | |
793 | case DHCP_STATE_BOUND: | |
aba26854 PF |
794 | |
795 | if (client->attempt < 64) | |
796 | client->attempt *= 2; | |
797 | ||
d23c45bf | 798 | next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC; |
aba26854 PF |
799 | |
800 | break; | |
781ca7a1 PF |
801 | |
802 | case DHCP_STATE_STOPPED: | |
803 | r = -EINVAL; | |
804 | goto error; | |
aba26854 PF |
805 | } |
806 | ||
9bf3b535 | 807 | next_timeout += (random_u32() & 0x1fffff); |
d3d8ac2f | 808 | |
2333154a UTL |
809 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
810 | ||
6a0f1f6d LP |
811 | r = sd_event_add_time(client->event, |
812 | &client->timeout_resend, | |
fa94c34b | 813 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
814 | next_timeout, 10 * USEC_PER_MSEC, |
815 | client_timeout_resend, client); | |
b25ef18b TG |
816 | if (r < 0) |
817 | goto error; | |
818 | ||
e5002702 TG |
819 | r = sd_event_source_set_priority(client->timeout_resend, |
820 | client->event_priority); | |
b25ef18b | 821 | if (r < 0) |
e2dfc79f | 822 | goto error; |
d3d8ac2f | 823 | |
356779df | 824 | r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer"); |
9021bb9f TG |
825 | if (r < 0) |
826 | goto error; | |
827 | ||
e2dfc79f PF |
828 | switch (client->state) { |
829 | case DHCP_STATE_INIT: | |
6236f49b | 830 | r = client_send_discover(client); |
b25ef18b | 831 | if (r >= 0) { |
e2dfc79f PF |
832 | client->state = DHCP_STATE_SELECTING; |
833 | client->attempt = 1; | |
834 | } else { | |
835 | if (client->attempt >= 64) | |
836 | goto error; | |
837 | } | |
838 | ||
839 | break; | |
840 | ||
841 | case DHCP_STATE_SELECTING: | |
6236f49b | 842 | r = client_send_discover(client); |
b25ef18b | 843 | if (r < 0 && client->attempt >= 64) |
d3d8ac2f PF |
844 | goto error; |
845 | ||
e2dfc79f PF |
846 | break; |
847 | ||
8b1243f7 | 848 | case DHCP_STATE_INIT_REBOOT: |
e2dfc79f | 849 | case DHCP_STATE_REQUESTING: |
aba26854 | 850 | case DHCP_STATE_RENEWING: |
3dd71400 | 851 | case DHCP_STATE_REBINDING: |
6236f49b | 852 | r = client_send_request(client); |
b25ef18b | 853 | if (r < 0 && client->attempt >= 64) |
e2dfc79f | 854 | goto error; |
d3d8ac2f | 855 | |
8b1243f7 PF |
856 | if (client->state == DHCP_STATE_INIT_REBOOT) |
857 | client->state = DHCP_STATE_REBOOTING; | |
858 | ||
d23c45bf | 859 | client->request_sent = time_now; |
51debc1e | 860 | |
d3d8ac2f PF |
861 | break; |
862 | ||
d3d8ac2f | 863 | case DHCP_STATE_REBOOTING: |
d3d8ac2f | 864 | case DHCP_STATE_BOUND: |
d3d8ac2f PF |
865 | |
866 | break; | |
781ca7a1 PF |
867 | |
868 | case DHCP_STATE_STOPPED: | |
869 | r = -EINVAL; | |
870 | goto error; | |
d3d8ac2f PF |
871 | } |
872 | ||
873 | return 0; | |
874 | ||
875 | error: | |
b25ef18b | 876 | client_stop(client, r); |
d3d8ac2f PF |
877 | |
878 | /* Errors were dealt with when stopping the client, don't spill | |
879 | errors into the event loop handler */ | |
880 | return 0; | |
881 | } | |
882 | ||
0af03ba5 TG |
883 | static int client_initialize_io_events(sd_dhcp_client *client, |
884 | sd_event_io_handler_t io_callback) { | |
6a1cd41e PF |
885 | int r; |
886 | ||
b25ef18b TG |
887 | assert(client); |
888 | assert(client->event); | |
889 | ||
151b9b96 LP |
890 | r = sd_event_add_io(client->event, &client->receive_message, |
891 | client->fd, EPOLLIN, io_callback, | |
892 | client); | |
6a1cd41e PF |
893 | if (r < 0) |
894 | goto error; | |
895 | ||
e5002702 TG |
896 | r = sd_event_source_set_priority(client->receive_message, |
897 | client->event_priority); | |
b25ef18b TG |
898 | if (r < 0) |
899 | goto error; | |
900 | ||
356779df | 901 | r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message"); |
9021bb9f TG |
902 | if (r < 0) |
903 | goto error; | |
904 | ||
0af03ba5 TG |
905 | error: |
906 | if (r < 0) | |
907 | client_stop(client, r); | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
912 | static int client_initialize_time_events(sd_dhcp_client *client) { | |
913 | int r; | |
914 | ||
915 | assert(client); | |
916 | assert(client->event); | |
917 | ||
2333154a UTL |
918 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
919 | ||
6a0f1f6d LP |
920 | r = sd_event_add_time(client->event, |
921 | &client->timeout_resend, | |
fa94c34b | 922 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
923 | 0, 0, |
924 | client_timeout_resend, client); | |
b25ef18b TG |
925 | if (r < 0) |
926 | goto error; | |
927 | ||
e5002702 TG |
928 | r = sd_event_source_set_priority(client->timeout_resend, |
929 | client->event_priority); | |
144c3488 TA |
930 | if (r < 0) |
931 | goto error; | |
6a1cd41e | 932 | |
356779df | 933 | r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer"); |
9021bb9f TG |
934 | if (r < 0) |
935 | goto error; | |
936 | ||
6a1cd41e PF |
937 | error: |
938 | if (r < 0) | |
939 | client_stop(client, r); | |
940 | ||
941 | return 0; | |
942 | ||
943 | } | |
944 | ||
0af03ba5 TG |
945 | static int client_initialize_events(sd_dhcp_client *client, |
946 | sd_event_io_handler_t io_callback) { | |
947 | client_initialize_io_events(client, io_callback); | |
948 | client_initialize_time_events(client); | |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
0f941add PF |
953 | static int client_start(sd_dhcp_client *client) { |
954 | int r; | |
955 | ||
956 | assert_return(client, -EINVAL); | |
957 | assert_return(client->event, -EINVAL); | |
958 | assert_return(client->index > 0, -EINVAL); | |
959 | assert_return(client->fd < 0, -EBUSY); | |
960 | assert_return(client->xid == 0, -EINVAL); | |
961 | assert_return(client->state == DHCP_STATE_INIT || | |
962 | client->state == DHCP_STATE_INIT_REBOOT, -EBUSY); | |
963 | ||
964 | client->xid = random_u32(); | |
965 | ||
76253e73 DW |
966 | r = dhcp_network_bind_raw_socket(client->index, &client->link, |
967 | client->xid, client->mac_addr, | |
968 | client->mac_addr_len, client->arp_type); | |
0f941add PF |
969 | if (r < 0) { |
970 | client_stop(client, r); | |
971 | return r; | |
972 | } | |
0f941add | 973 | client->fd = r; |
58ec2d3e | 974 | |
d8d74ef0 | 975 | if (client->state == DHCP_STATE_INIT || client->state == DHCP_STATE_INIT_REBOOT) |
fa94c34b | 976 | client->start_time = now(clock_boottime_or_monotonic()); |
0f941add | 977 | |
0f941add PF |
978 | return client_initialize_events(client, client_receive_message_raw); |
979 | } | |
980 | ||
51debc1e | 981 | static int client_timeout_expire(sd_event_source *s, uint64_t usec, |
5ee482df | 982 | void *userdata) { |
751246ee | 983 | sd_dhcp_client *client = userdata; |
574cc928 | 984 | DHCP_CLIENT_DONT_DESTROY(client); |
751246ee | 985 | |
ee57a737 TG |
986 | log_dhcp_client(client, "EXPIRED"); |
987 | ||
03748142 | 988 | client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); |
0f941add | 989 | |
781ca7a1 | 990 | /* lease was lost, start over if not freed or stopped in callback */ |
574cc928 | 991 | if (client->state != DHCP_STATE_STOPPED) { |
e5b04c8d PF |
992 | client_initialize(client); |
993 | client_start(client); | |
994 | } | |
751246ee | 995 | |
51debc1e PF |
996 | return 0; |
997 | } | |
998 | ||
5ee482df | 999 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
3dd71400 | 1000 | sd_dhcp_client *client = userdata; |
574cc928 | 1001 | DHCP_CLIENT_DONT_DESTROY(client); |
3dd71400 PF |
1002 | int r; |
1003 | ||
03e334a1 | 1004 | client->receive_message = sd_event_source_unref(client->receive_message); |
22fc2420 | 1005 | client->fd = asynchronous_close(client->fd); |
3dd71400 PF |
1006 | |
1007 | client->state = DHCP_STATE_REBINDING; | |
1008 | client->attempt = 1; | |
1009 | ||
76253e73 DW |
1010 | r = dhcp_network_bind_raw_socket(client->index, &client->link, |
1011 | client->xid, client->mac_addr, | |
1012 | client->mac_addr_len, client->arp_type); | |
3dd71400 PF |
1013 | if (r < 0) { |
1014 | client_stop(client, r); | |
1015 | return 0; | |
1016 | } | |
3dd71400 PF |
1017 | client->fd = r; |
1018 | ||
d23c45bf | 1019 | return client_initialize_events(client, client_receive_message_raw); |
51debc1e PF |
1020 | } |
1021 | ||
e5002702 TG |
1022 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, |
1023 | void *userdata) { | |
aba26854 | 1024 | sd_dhcp_client *client = userdata; |
574cc928 | 1025 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 PF |
1026 | |
1027 | client->state = DHCP_STATE_RENEWING; | |
1028 | client->attempt = 1; | |
1029 | ||
0af03ba5 | 1030 | return client_initialize_time_events(client); |
51debc1e PF |
1031 | } |
1032 | ||
e5002702 TG |
1033 | static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, |
1034 | size_t len) { | |
a6cc569e | 1035 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; |
5ee482df | 1036 | int r; |
3e3d8f78 | 1037 | |
a6cc569e TG |
1038 | r = dhcp_lease_new(&lease); |
1039 | if (r < 0) | |
1040 | return r; | |
8c00042c | 1041 | |
e37f74a6 DW |
1042 | if (client->client_id_len) { |
1043 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1044 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1045 | client->client_id_len); |
1046 | if (r < 0) | |
1047 | return r; | |
1048 | } | |
1049 | ||
e5002702 | 1050 | r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease); |
9e64dd72 | 1051 | if (r != DHCP_OFFER) { |
6ff8806e | 1052 | log_dhcp_client(client, "received message was not an OFFER, ignoring"); |
5ee482df | 1053 | return -ENOMSG; |
9e64dd72 | 1054 | } |
8c00042c | 1055 | |
8e34a618 | 1056 | lease->next_server = offer->siaddr; |
e5002702 | 1057 | lease->address = offer->yiaddr; |
8c00042c | 1058 | |
0339cd77 LP |
1059 | if (lease->address == 0 || |
1060 | lease->server_address == 0 || | |
9e64dd72 | 1061 | lease->lifetime == 0) { |
0339cd77 | 1062 | log_dhcp_client(client, "received lease lacks address, server address or lease lifetime, ignoring"); |
5ee482df | 1063 | return -ENOMSG; |
9e64dd72 TG |
1064 | } |
1065 | ||
0339cd77 | 1066 | if (!lease->have_subnet_mask) { |
9e64dd72 TG |
1067 | r = dhcp_lease_set_default_subnet_mask(lease); |
1068 | if (r < 0) { | |
6ff8806e | 1069 | log_dhcp_client(client, "received lease lacks subnet " |
9e64dd72 TG |
1070 | "mask, and a fallback one can not be " |
1071 | "generated, ignoring"); | |
1072 | return -ENOMSG; | |
1073 | } | |
1074 | } | |
8c00042c | 1075 | |
6e00a806 | 1076 | sd_dhcp_lease_unref(client->lease); |
8c00042c | 1077 | client->lease = lease; |
5ee482df | 1078 | lease = NULL; |
8c00042c | 1079 | |
ee57a737 TG |
1080 | log_dhcp_client(client, "OFFER"); |
1081 | ||
8c00042c | 1082 | return 0; |
8c00042c PF |
1083 | } |
1084 | ||
615c1467 TG |
1085 | static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force, |
1086 | size_t len) { | |
1087 | int r; | |
1088 | ||
1089 | r = dhcp_option_parse(force, len, NULL, NULL); | |
1090 | if (r != DHCP_FORCERENEW) | |
1091 | return -ENOMSG; | |
1092 | ||
1093 | log_dhcp_client(client, "FORCERENEW"); | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
e5002702 TG |
1098 | static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, |
1099 | size_t len) { | |
a6cc569e | 1100 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; |
5ee482df | 1101 | int r; |
3e3d8f78 | 1102 | |
a6cc569e TG |
1103 | r = dhcp_lease_new(&lease); |
1104 | if (r < 0) | |
1105 | return r; | |
3e3d8f78 | 1106 | |
e37f74a6 DW |
1107 | if (client->client_id_len) { |
1108 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1109 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1110 | client->client_id_len); |
1111 | if (r < 0) | |
1112 | return r; | |
1113 | } | |
1114 | ||
e5002702 | 1115 | r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease); |
ee57a737 TG |
1116 | if (r == DHCP_NAK) { |
1117 | log_dhcp_client(client, "NAK"); | |
2d2349cc | 1118 | return -EADDRNOTAVAIL; |
ee57a737 | 1119 | } |
3e3d8f78 | 1120 | |
9e64dd72 | 1121 | if (r != DHCP_ACK) { |
6ff8806e | 1122 | log_dhcp_client(client, "received message was not an ACK, ignoring"); |
5ee482df | 1123 | return -ENOMSG; |
9e64dd72 | 1124 | } |
3e3d8f78 | 1125 | |
8e34a618 TG |
1126 | lease->next_server = ack->siaddr; |
1127 | ||
e5002702 | 1128 | lease->address = ack->yiaddr; |
3e3d8f78 PF |
1129 | |
1130 | if (lease->address == INADDR_ANY || | |
1131 | lease->server_address == INADDR_ANY || | |
9e64dd72 | 1132 | lease->lifetime == 0) { |
6ff8806e | 1133 | log_dhcp_client(client, "received lease lacks address, server " |
9e64dd72 | 1134 | "address or lease lifetime, ignoring"); |
5ee482df | 1135 | return -ENOMSG; |
9e64dd72 TG |
1136 | } |
1137 | ||
1138 | if (lease->subnet_mask == INADDR_ANY) { | |
1139 | r = dhcp_lease_set_default_subnet_mask(lease); | |
1140 | if (r < 0) { | |
6ff8806e | 1141 | log_dhcp_client(client, "received lease lacks subnet " |
9e64dd72 TG |
1142 | "mask, and a fallback one can not be " |
1143 | "generated, ignoring"); | |
1144 | return -ENOMSG; | |
1145 | } | |
1146 | } | |
3e3d8f78 | 1147 | |
03748142 | 1148 | r = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
3e3d8f78 PF |
1149 | if (client->lease) { |
1150 | if (client->lease->address != lease->address || | |
1151 | client->lease->subnet_mask != lease->subnet_mask || | |
1152 | client->lease->router != lease->router) { | |
03748142 | 1153 | r = SD_DHCP_CLIENT_EVENT_IP_CHANGE; |
68ceb9df | 1154 | } else |
03748142 | 1155 | r = SD_DHCP_CLIENT_EVENT_RENEW; |
3e3d8f78 | 1156 | |
a6cc569e | 1157 | client->lease = sd_dhcp_lease_unref(client->lease); |
3e3d8f78 PF |
1158 | } |
1159 | ||
1160 | client->lease = lease; | |
5ee482df | 1161 | lease = NULL; |
3e3d8f78 | 1162 | |
ee57a737 TG |
1163 | log_dhcp_client(client, "ACK"); |
1164 | ||
3e3d8f78 PF |
1165 | return r; |
1166 | } | |
1167 | ||
fbcd420a | 1168 | static uint64_t client_compute_timeout(sd_dhcp_client *client, uint32_t lifetime, double factor) { |
022446ad TG |
1169 | assert(client); |
1170 | assert(client->request_sent); | |
fbcd420a | 1171 | assert(lifetime > 0); |
022446ad | 1172 | |
fbcd420a LP |
1173 | if (lifetime > 3) |
1174 | lifetime -= 3; | |
1175 | else | |
1176 | lifetime = 0; | |
1177 | ||
1178 | return client->request_sent + (lifetime * USEC_PER_SEC * factor) + | |
9bf3b535 | 1179 | + (random_u32() & 0x1fffff); |
51debc1e PF |
1180 | } |
1181 | ||
022446ad TG |
1182 | static int client_set_lease_timeouts(sd_dhcp_client *client) { |
1183 | usec_t time_now; | |
1184 | uint64_t lifetime_timeout; | |
1185 | uint64_t t2_timeout; | |
1186 | uint64_t t1_timeout; | |
1187 | char time_string[FORMAT_TIMESPAN_MAX]; | |
5ee482df | 1188 | int r; |
51debc1e | 1189 | |
b25ef18b TG |
1190 | assert(client); |
1191 | assert(client->event); | |
022446ad TG |
1192 | assert(client->lease); |
1193 | assert(client->lease->lifetime); | |
51debc1e | 1194 | |
aba26854 PF |
1195 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); |
1196 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
1197 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
1198 | ||
022446ad TG |
1199 | /* don't set timers for infinite leases */ |
1200 | if (client->lease->lifetime == 0xffffffff) | |
1201 | return 0; | |
51debc1e | 1202 | |
fa94c34b | 1203 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
022446ad TG |
1204 | if (r < 0) |
1205 | return r; | |
1206 | assert(client->request_sent <= time_now); | |
1207 | ||
1208 | /* convert the various timeouts from relative (secs) to absolute (usecs) */ | |
1209 | lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1); | |
fbcd420a | 1210 | if (client->lease->t1 > 0 && client->lease->t2 > 0) { |
022446ad TG |
1211 | /* both T1 and T2 are given */ |
1212 | if (client->lease->t1 < client->lease->t2 && | |
1213 | client->lease->t2 < client->lease->lifetime) { | |
1214 | /* they are both valid */ | |
1215 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1216 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1217 | } else { | |
1218 | /* discard both */ | |
1219 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1220 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1221 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1222 | client->lease->t1 = client->lease->lifetime / 2; | |
1223 | } | |
fbcd420a | 1224 | } else if (client->lease->t2 > 0 && client->lease->t2 < client->lease->lifetime) { |
022446ad TG |
1225 | /* only T2 is given, and it is valid */ |
1226 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1227 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1228 | client->lease->t1 = client->lease->lifetime / 2; | |
1229 | if (t2_timeout <= t1_timeout) { | |
1230 | /* the computed T1 would be invalid, so discard T2 */ | |
1231 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1232 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1233 | } | |
fbcd420a | 1234 | } else if (client->lease->t1 > 0 && client->lease->t1 < client->lease->lifetime) { |
022446ad TG |
1235 | /* only T1 is given, and it is valid */ |
1236 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1237 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1238 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1239 | if (t2_timeout <= t1_timeout) { | |
1240 | /* the computed T2 would be invalid, so discard T1 */ | |
1241 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1242 | client->lease->t2 = client->lease->lifetime / 2; | |
1243 | } | |
1244 | } else { | |
1245 | /* fall back to the default timeouts */ | |
1246 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1247 | client->lease->t1 = client->lease->lifetime / 2; | |
1248 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1249 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1250 | } | |
51debc1e | 1251 | |
022446ad | 1252 | /* arm lifetime timeout */ |
6a0f1f6d | 1253 | r = sd_event_add_time(client->event, &client->timeout_expire, |
fa94c34b | 1254 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1255 | lifetime_timeout, 10 * USEC_PER_MSEC, |
1256 | client_timeout_expire, client); | |
5ee482df TG |
1257 | if (r < 0) |
1258 | return r; | |
51debc1e | 1259 | |
022446ad | 1260 | r = sd_event_source_set_priority(client->timeout_expire, |
e5002702 | 1261 | client->event_priority); |
b25ef18b TG |
1262 | if (r < 0) |
1263 | return r; | |
1264 | ||
356779df | 1265 | r = sd_event_source_set_description(client->timeout_expire, "dhcp4-lifetime"); |
9021bb9f TG |
1266 | if (r < 0) |
1267 | return r; | |
1268 | ||
022446ad | 1269 | log_dhcp_client(client, "lease expires in %s", |
ed19c567 | 1270 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_timeout - time_now, USEC_PER_SEC)); |
51debc1e | 1271 | |
022446ad TG |
1272 | /* don't arm earlier timeouts if this has already expired */ |
1273 | if (lifetime_timeout <= time_now) | |
1274 | return 0; | |
51debc1e | 1275 | |
022446ad | 1276 | /* arm T2 timeout */ |
6a0f1f6d LP |
1277 | r = sd_event_add_time(client->event, |
1278 | &client->timeout_t2, | |
fa94c34b | 1279 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1280 | t2_timeout, |
1281 | 10 * USEC_PER_MSEC, | |
1282 | client_timeout_t2, client); | |
5ee482df TG |
1283 | if (r < 0) |
1284 | return r; | |
51debc1e | 1285 | |
e5002702 TG |
1286 | r = sd_event_source_set_priority(client->timeout_t2, |
1287 | client->event_priority); | |
b25ef18b TG |
1288 | if (r < 0) |
1289 | return r; | |
1290 | ||
356779df | 1291 | r = sd_event_source_set_description(client->timeout_t2, "dhcp4-t2-timeout"); |
9021bb9f TG |
1292 | if (r < 0) |
1293 | return r; | |
1294 | ||
022446ad | 1295 | log_dhcp_client(client, "T2 expires in %s", |
ed19c567 | 1296 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t2_timeout - time_now, USEC_PER_SEC)); |
022446ad TG |
1297 | |
1298 | /* don't arm earlier timeout if this has already expired */ | |
1299 | if (t2_timeout <= time_now) | |
1300 | return 0; | |
51debc1e | 1301 | |
022446ad | 1302 | /* arm T1 timeout */ |
6a0f1f6d LP |
1303 | r = sd_event_add_time(client->event, |
1304 | &client->timeout_t1, | |
fa94c34b | 1305 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1306 | t1_timeout, 10 * USEC_PER_MSEC, |
1307 | client_timeout_t1, client); | |
5ee482df TG |
1308 | if (r < 0) |
1309 | return r; | |
51debc1e | 1310 | |
022446ad | 1311 | r = sd_event_source_set_priority(client->timeout_t1, |
e5002702 | 1312 | client->event_priority); |
b25ef18b TG |
1313 | if (r < 0) |
1314 | return r; | |
1315 | ||
356779df | 1316 | r = sd_event_source_set_description(client->timeout_t1, "dhcp4-t1-timer"); |
9021bb9f TG |
1317 | if (r < 0) |
1318 | return r; | |
1319 | ||
022446ad | 1320 | log_dhcp_client(client, "T1 expires in %s", |
ed19c567 | 1321 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t1_timeout - time_now, USEC_PER_SEC)); |
022446ad | 1322 | |
51debc1e PF |
1323 | return 0; |
1324 | } | |
1325 | ||
e5002702 | 1326 | static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, |
022446ad | 1327 | int len) { |
574cc928 | 1328 | DHCP_CLIENT_DONT_DESTROY(client); |
e5002702 | 1329 | int r = 0, notify_event = 0; |
8c00042c | 1330 | |
b25ef18b TG |
1331 | assert(client); |
1332 | assert(client->event); | |
e5002702 | 1333 | assert(message); |
b25ef18b | 1334 | |
8c00042c PF |
1335 | switch (client->state) { |
1336 | case DHCP_STATE_SELECTING: | |
1337 | ||
e5002702 TG |
1338 | r = client_handle_offer(client, message, len); |
1339 | if (r >= 0) { | |
8c00042c | 1340 | |
8c00042c PF |
1341 | client->timeout_resend = |
1342 | sd_event_source_unref(client->timeout_resend); | |
1343 | ||
1344 | client->state = DHCP_STATE_REQUESTING; | |
e2dfc79f PF |
1345 | client->attempt = 1; |
1346 | ||
6a0f1f6d LP |
1347 | r = sd_event_add_time(client->event, |
1348 | &client->timeout_resend, | |
fa94c34b | 1349 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1350 | 0, 0, |
1351 | client_timeout_resend, client); | |
3e3d8f78 | 1352 | if (r < 0) |
e2dfc79f | 1353 | goto error; |
b25ef18b | 1354 | |
e5002702 TG |
1355 | r = sd_event_source_set_priority(client->timeout_resend, |
1356 | client->event_priority); | |
b25ef18b TG |
1357 | if (r < 0) |
1358 | goto error; | |
9021bb9f | 1359 | |
356779df | 1360 | r = sd_event_source_set_description(client->timeout_resend, "dhcp4-resend-timer"); |
9021bb9f TG |
1361 | if (r < 0) |
1362 | goto error; | |
9e64dd72 TG |
1363 | } else if (r == -ENOMSG) |
1364 | /* invalid message, let's ignore it */ | |
1365 | return 0; | |
8c00042c PF |
1366 | |
1367 | break; | |
1368 | ||
8b1243f7 | 1369 | case DHCP_STATE_REBOOTING: |
3e3d8f78 | 1370 | case DHCP_STATE_REQUESTING: |
aba26854 | 1371 | case DHCP_STATE_RENEWING: |
3dd71400 | 1372 | case DHCP_STATE_REBINDING: |
aba26854 | 1373 | |
e5002702 | 1374 | r = client_handle_ack(client, message, len); |
2d2349cc | 1375 | if (r >= 0) { |
3e3d8f78 PF |
1376 | client->timeout_resend = |
1377 | sd_event_source_unref(client->timeout_resend); | |
affaa94f DW |
1378 | client->receive_message = |
1379 | sd_event_source_unref(client->receive_message); | |
1380 | client->fd = asynchronous_close(client->fd); | |
3e3d8f78 | 1381 | |
8b1243f7 PF |
1382 | if (IN_SET(client->state, DHCP_STATE_REQUESTING, |
1383 | DHCP_STATE_REBOOTING)) | |
03748142 DH |
1384 | notify_event = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
1385 | else if (r != SD_DHCP_CLIENT_EVENT_IP_ACQUIRE) | |
aba26854 PF |
1386 | notify_event = r; |
1387 | ||
3e3d8f78 PF |
1388 | client->state = DHCP_STATE_BOUND; |
1389 | client->attempt = 1; | |
1390 | ||
1391 | client->last_addr = client->lease->address; | |
1392 | ||
022446ad | 1393 | r = client_set_lease_timeouts(client); |
0411760a TG |
1394 | if (r < 0) { |
1395 | log_dhcp_client(client, "could not set lease timeouts"); | |
51debc1e | 1396 | goto error; |
0411760a | 1397 | } |
51debc1e | 1398 | |
0af03ba5 TG |
1399 | r = dhcp_network_bind_udp_socket(client->lease->address, |
1400 | DHCP_PORT_CLIENT); | |
1401 | if (r < 0) { | |
1402 | log_dhcp_client(client, "could not bind UDP socket"); | |
1403 | goto error; | |
1404 | } | |
1405 | ||
1406 | client->fd = r; | |
1407 | ||
1408 | client_initialize_io_events(client, client_receive_message_udp); | |
1409 | ||
e5b04c8d | 1410 | if (notify_event) { |
574cc928 TG |
1411 | client_notify(client, notify_event); |
1412 | if (client->state == DHCP_STATE_STOPPED) | |
e5b04c8d PF |
1413 | return 0; |
1414 | } | |
3e3d8f78 | 1415 | |
2d2349cc TG |
1416 | } else if (r == -EADDRNOTAVAIL) { |
1417 | /* got a NAK, let's restart the client */ | |
1418 | client->timeout_resend = | |
1419 | sd_event_source_unref(client->timeout_resend); | |
1420 | ||
1421 | r = client_initialize(client); | |
1422 | if (r < 0) | |
1423 | goto error; | |
1424 | ||
1425 | r = client_start(client); | |
1426 | if (r < 0) | |
1427 | goto error; | |
1428 | ||
1429 | log_dhcp_client(client, "REBOOTED"); | |
1430 | ||
1431 | return 0; | |
9e64dd72 TG |
1432 | } else if (r == -ENOMSG) |
1433 | /* invalid message, let's ignore it */ | |
1434 | return 0; | |
97b9372d | 1435 | |
3e3d8f78 PF |
1436 | break; |
1437 | ||
615c1467 TG |
1438 | case DHCP_STATE_BOUND: |
1439 | r = client_handle_forcerenew(client, message, len); | |
1440 | if (r >= 0) { | |
1441 | r = client_timeout_t1(NULL, 0, client); | |
1442 | if (r < 0) | |
1443 | goto error; | |
1444 | } else if (r == -ENOMSG) | |
1445 | /* invalid message, let's ignore it */ | |
1446 | return 0; | |
1447 | ||
1448 | break; | |
1449 | ||
8c00042c PF |
1450 | case DHCP_STATE_INIT: |
1451 | case DHCP_STATE_INIT_REBOOT: | |
8c00042c PF |
1452 | |
1453 | break; | |
781ca7a1 PF |
1454 | |
1455 | case DHCP_STATE_STOPPED: | |
1456 | r = -EINVAL; | |
1457 | goto error; | |
8c00042c PF |
1458 | } |
1459 | ||
1460 | error: | |
2d2349cc | 1461 | if (r < 0) |
e5b04c8d | 1462 | client_stop(client, r); |
e2dfc79f | 1463 | |
e5b04c8d | 1464 | return r; |
8c00042c PF |
1465 | } |
1466 | ||
8f61afd8 | 1467 | static int client_receive_message_udp(sd_event_source *s, int fd, |
e5002702 TG |
1468 | uint32_t revents, void *userdata) { |
1469 | sd_dhcp_client *client = userdata; | |
5266a81e TG |
1470 | _cleanup_free_ DHCPMessage *message = NULL; |
1471 | int buflen = 0, len, r; | |
76253e73 | 1472 | const struct ether_addr zero_mac = { { 0, 0, 0, 0, 0, 0 } }; |
3dc05554 | 1473 | const struct ether_addr *expected_chaddr = NULL; |
76253e73 | 1474 | uint8_t expected_hlen = 0; |
e5002702 TG |
1475 | |
1476 | assert(s); | |
1477 | assert(client); | |
e5002702 | 1478 | |
5266a81e | 1479 | r = ioctl(fd, FIONREAD, &buflen); |
23289745 TG |
1480 | if (r < 0) |
1481 | return r; | |
1482 | ||
1483 | if (buflen < 0) | |
1484 | /* this can't be right */ | |
1485 | return -EIO; | |
5266a81e TG |
1486 | |
1487 | message = malloc0(buflen); | |
1488 | if (!message) | |
1489 | return -ENOMEM; | |
1490 | ||
1491 | len = read(fd, message, buflen); | |
0c79c68d TG |
1492 | if (len < 0) { |
1493 | log_dhcp_client(client, "could not receive message from UDP " | |
590b6b91 | 1494 | "socket: %m"); |
0c79c68d | 1495 | return 0; |
9fbc2523 TG |
1496 | } else if ((size_t)len < sizeof(DHCPMessage)) { |
1497 | log_dhcp_client(client, "too small to be a DHCP message: ignoring"); | |
e5002702 | 1498 | return 0; |
9fbc2523 TG |
1499 | } |
1500 | ||
1501 | if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) { | |
1502 | log_dhcp_client(client, "not a DHCP message: ignoring"); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | if (message->op != BOOTREPLY) { | |
1507 | log_dhcp_client(client, "not a BOOTREPLY message: ignoring"); | |
1508 | return 0; | |
1509 | } | |
1510 | ||
76253e73 DW |
1511 | if (message->htype != client->arp_type) { |
1512 | log_dhcp_client(client, "packet type does not match client type"); | |
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | if (client->arp_type == ARPHRD_ETHER) { | |
1517 | expected_hlen = ETH_ALEN; | |
3dc05554 | 1518 | expected_chaddr = (const struct ether_addr *) &client->mac_addr; |
76253e73 DW |
1519 | } else { |
1520 | /* Non-ethernet links expect zero chaddr */ | |
1521 | expected_hlen = 0; | |
3dc05554 | 1522 | expected_chaddr = &zero_mac; |
76253e73 DW |
1523 | } |
1524 | ||
1525 | if (message->hlen != expected_hlen) { | |
1526 | log_dhcp_client(client, "unexpected packet hlen %d", message->hlen); | |
9fbc2523 TG |
1527 | return 0; |
1528 | } | |
1529 | ||
3dc05554 | 1530 | if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) { |
9fbc2523 TG |
1531 | log_dhcp_client(client, "received chaddr does not match " |
1532 | "expected: ignoring"); | |
1533 | return 0; | |
1534 | } | |
e5002702 | 1535 | |
615c1467 TG |
1536 | if (client->state != DHCP_STATE_BOUND && |
1537 | be32toh(message->xid) != client->xid) { | |
1538 | /* in BOUND state, we may receive FORCERENEW with xid set by server, | |
1539 | so ignore the xid in this case */ | |
1540 | log_dhcp_client(client, "received xid (%u) does not match " | |
1541 | "expected (%u): ignoring", | |
1542 | be32toh(message->xid), client->xid); | |
1543 | return 0; | |
1544 | } | |
1545 | ||
022446ad | 1546 | return client_handle_message(client, message, len); |
e5002702 TG |
1547 | } |
1548 | ||
8f61afd8 | 1549 | static int client_receive_message_raw(sd_event_source *s, int fd, |
e5002702 TG |
1550 | uint32_t revents, void *userdata) { |
1551 | sd_dhcp_client *client = userdata; | |
5266a81e | 1552 | _cleanup_free_ DHCPPacket *packet = NULL; |
55dab2ed TG |
1553 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; |
1554 | struct iovec iov = {}; | |
1555 | struct msghdr msg = { | |
1556 | .msg_iov = &iov, | |
1557 | .msg_iovlen = 1, | |
1558 | .msg_control = cmsgbuf, | |
1559 | .msg_controllen = sizeof(cmsgbuf), | |
1560 | }; | |
1561 | struct cmsghdr *cmsg; | |
1562 | bool checksum = true; | |
1563 | int buflen = 0, len, r; | |
e5002702 TG |
1564 | |
1565 | assert(s); | |
1566 | assert(client); | |
e5002702 | 1567 | |
5266a81e | 1568 | r = ioctl(fd, FIONREAD, &buflen); |
23289745 TG |
1569 | if (r < 0) |
1570 | return r; | |
1571 | ||
1572 | if (buflen < 0) | |
1573 | /* this can't be right */ | |
1574 | return -EIO; | |
5266a81e TG |
1575 | |
1576 | packet = malloc0(buflen); | |
1577 | if (!packet) | |
1578 | return -ENOMEM; | |
1579 | ||
55dab2ed TG |
1580 | iov.iov_base = packet; |
1581 | iov.iov_len = buflen; | |
1582 | ||
a38d9945 | 1583 | len = recvmsg(fd, &msg, 0); |
55dab2ed TG |
1584 | if (len < 0) { |
1585 | log_dhcp_client(client, "could not receive message from raw " | |
590b6b91 | 1586 | "socket: %m"); |
e5002702 | 1587 | return 0; |
0c79c68d TG |
1588 | } else if ((size_t)len < sizeof(DHCPPacket)) |
1589 | return 0; | |
55dab2ed | 1590 | |
2a1288ff | 1591 | CMSG_FOREACH(cmsg, &msg) { |
48a4612e TG |
1592 | if (cmsg->cmsg_level == SOL_PACKET && |
1593 | cmsg->cmsg_type == PACKET_AUXDATA && | |
1594 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) { | |
1595 | struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg); | |
55dab2ed TG |
1596 | |
1597 | checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY); | |
1598 | break; | |
1599 | } | |
1600 | } | |
e5002702 | 1601 | |
55dab2ed | 1602 | r = dhcp_packet_verify_headers(packet, len, checksum); |
ac4f16ab | 1603 | if (r < 0) |
9fadd4ca | 1604 | return 0; |
e5002702 TG |
1605 | |
1606 | len -= DHCP_IP_UDP_SIZE; | |
1607 | ||
022446ad | 1608 | return client_handle_message(client, &packet->dhcp, len); |
e5002702 TG |
1609 | } |
1610 | ||
5ee482df | 1611 | int sd_dhcp_client_start(sd_dhcp_client *client) { |
6a1cd41e | 1612 | int r; |
d3d8ac2f | 1613 | |
46a66b79 | 1614 | assert_return(client, -EINVAL); |
46a66b79 | 1615 | |
0f941add PF |
1616 | r = client_initialize(client); |
1617 | if (r < 0) | |
6a1cd41e | 1618 | return r; |
8c00042c | 1619 | |
0f941add PF |
1620 | if (client->last_addr) |
1621 | client->state = DHCP_STATE_INIT_REBOOT; | |
d3d8ac2f | 1622 | |
998d8047 TG |
1623 | r = client_start(client); |
1624 | if (r >= 0) | |
1fa2f38f | 1625 | log_dhcp_client(client, "STARTED on ifindex %i", client->index); |
998d8047 TG |
1626 | |
1627 | return r; | |
46a66b79 PF |
1628 | } |
1629 | ||
5ee482df | 1630 | int sd_dhcp_client_stop(sd_dhcp_client *client) { |
574cc928 TG |
1631 | DHCP_CLIENT_DONT_DESTROY(client); |
1632 | ||
e5b04c8d PF |
1633 | assert_return(client, -EINVAL); |
1634 | ||
03748142 | 1635 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
574cc928 | 1636 | client->state = DHCP_STATE_STOPPED; |
e5b04c8d PF |
1637 | |
1638 | return 0; | |
bbdf06d9 PF |
1639 | } |
1640 | ||
e5002702 TG |
1641 | int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, |
1642 | int priority) { | |
b25ef18b TG |
1643 | int r; |
1644 | ||
1645 | assert_return(client, -EINVAL); | |
1646 | assert_return(!client->event, -EBUSY); | |
1647 | ||
1648 | if (event) | |
1649 | client->event = sd_event_ref(event); | |
1650 | else { | |
1651 | r = sd_event_default(&client->event); | |
1652 | if (r < 0) | |
1653 | return 0; | |
1654 | } | |
1655 | ||
1656 | client->event_priority = priority; | |
1657 | ||
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | int sd_dhcp_client_detach_event(sd_dhcp_client *client) { | |
1662 | assert_return(client, -EINVAL); | |
1663 | ||
1664 | client->event = sd_event_unref(client->event); | |
1665 | ||
1666 | return 0; | |
1667 | } | |
1668 | ||
1669 | sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { | |
1670 | if (!client) | |
1671 | return NULL; | |
1672 | ||
1673 | return client->event; | |
1674 | } | |
1675 | ||
e5b04c8d | 1676 | sd_dhcp_client *sd_dhcp_client_ref(sd_dhcp_client *client) { |
3733eec3 LP |
1677 | |
1678 | if (!client) | |
1679 | return NULL; | |
1680 | ||
1681 | assert(client->n_ref >= 1); | |
1682 | client->n_ref++; | |
e5b04c8d PF |
1683 | |
1684 | return client; | |
1685 | } | |
1686 | ||
1687 | sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) { | |
d2fe46b5 | 1688 | |
3733eec3 LP |
1689 | if (!client) |
1690 | return NULL; | |
e5b04c8d | 1691 | |
3733eec3 LP |
1692 | assert(client->n_ref >= 1); |
1693 | client->n_ref--; | |
e5b04c8d | 1694 | |
3733eec3 LP |
1695 | if (client->n_ref > 0) |
1696 | return NULL; | |
e5b04c8d | 1697 | |
3733eec3 | 1698 | log_dhcp_client(client, "FREE"); |
6e00a806 | 1699 | |
3733eec3 LP |
1700 | client_initialize(client); |
1701 | ||
1702 | client->receive_message = sd_event_source_unref(client->receive_message); | |
1703 | ||
1704 | sd_dhcp_client_detach_event(client); | |
1705 | ||
1706 | sd_dhcp_lease_unref(client->lease); | |
1707 | ||
1708 | free(client->req_opts); | |
1709 | free(client->hostname); | |
1710 | free(client->vendor_class_identifier); | |
1711 | free(client); | |
d2fe46b5 | 1712 | |
574cc928 | 1713 | return NULL; |
d2fe46b5 PF |
1714 | } |
1715 | ||
b25ef18b | 1716 | int sd_dhcp_client_new(sd_dhcp_client **ret) { |
574cc928 | 1717 | _cleanup_dhcp_client_unref_ sd_dhcp_client *client = NULL; |
011feef8 | 1718 | |
b25ef18b | 1719 | assert_return(ret, -EINVAL); |
d3d8ac2f | 1720 | |
011feef8 PF |
1721 | client = new0(sd_dhcp_client, 1); |
1722 | if (!client) | |
b25ef18b | 1723 | return -ENOMEM; |
011feef8 | 1724 | |
3733eec3 | 1725 | client->n_ref = 1; |
011feef8 PF |
1726 | client->state = DHCP_STATE_INIT; |
1727 | client->index = -1; | |
8c00042c | 1728 | client->fd = -1; |
e2dfc79f | 1729 | client->attempt = 1; |
324f8187 | 1730 | client->mtu = DHCP_DEFAULT_MIN_SIZE; |
011feef8 PF |
1731 | |
1732 | client->req_opts_size = ELEMENTSOF(default_req_opts); | |
1733 | ||
1734 | client->req_opts = memdup(default_req_opts, client->req_opts_size); | |
b25ef18b TG |
1735 | if (!client->req_opts) |
1736 | return -ENOMEM; | |
1737 | ||
1738 | *ret = client; | |
1739 | client = NULL; | |
011feef8 | 1740 | |
b25ef18b | 1741 | return 0; |
011feef8 | 1742 | } |