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Commit | Line | Data |
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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 | ||
20 | #include <stdlib.h> | |
21 | #include <errno.h> | |
22 | #include <string.h> | |
23 | #include <stdio.h> | |
46a66b79 | 24 | #include <net/ethernet.h> |
aba26854 | 25 | #include <sys/param.h> |
5266a81e | 26 | #include <sys/ioctl.h> |
011feef8 PF |
27 | |
28 | #include "util.h" | |
29 | #include "list.h" | |
30 | ||
31 | #include "dhcp-protocol.h" | |
46a66b79 | 32 | #include "dhcp-internal.h" |
fe8db0c5 | 33 | #include "dhcp-lease-internal.h" |
011feef8 PF |
34 | #include "sd-dhcp-client.h" |
35 | ||
36 | struct sd_dhcp_client { | |
37 | DHCPState state; | |
d3d8ac2f | 38 | sd_event *event; |
b25ef18b | 39 | int event_priority; |
d3d8ac2f | 40 | sd_event_source *timeout_resend; |
011feef8 | 41 | int index; |
8c00042c PF |
42 | int fd; |
43 | union sockaddr_union link; | |
44 | sd_event_source *receive_message; | |
011feef8 | 45 | uint8_t *req_opts; |
7a7c74ca | 46 | size_t req_opts_allocated; |
011feef8 | 47 | size_t req_opts_size; |
3b349af6 | 48 | be32_t last_addr; |
46a66b79 PF |
49 | struct ether_addr mac_addr; |
50 | uint32_t xid; | |
d3d8ac2f | 51 | usec_t start_time; |
40e39f62 | 52 | uint16_t secs; |
e2dfc79f | 53 | unsigned int attempt; |
51debc1e PF |
54 | usec_t request_sent; |
55 | sd_event_source *timeout_t1; | |
56 | sd_event_source *timeout_t2; | |
57 | sd_event_source *timeout_expire; | |
751246ee PF |
58 | sd_dhcp_client_cb_t cb; |
59 | void *userdata; | |
a6cc569e | 60 | sd_dhcp_lease *lease; |
011feef8 PF |
61 | }; |
62 | ||
63 | static const uint8_t default_req_opts[] = { | |
64 | DHCP_OPTION_SUBNET_MASK, | |
65 | DHCP_OPTION_ROUTER, | |
66 | DHCP_OPTION_HOST_NAME, | |
67 | DHCP_OPTION_DOMAIN_NAME, | |
68 | DHCP_OPTION_DOMAIN_NAME_SERVER, | |
69 | DHCP_OPTION_NTP_SERVER, | |
70 | }; | |
71 | ||
e5002702 TG |
72 | static int client_receive_message_raw(sd_event_source *s, int fd, |
73 | uint32_t revents, void *userdata); | |
74 | static int client_receive_message_udp(sd_event_source *s, int fd, | |
75 | uint32_t revents, void *userdata); | |
aba26854 | 76 | |
751246ee | 77 | int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb, |
5ee482df | 78 | void *userdata) { |
751246ee PF |
79 | assert_return(client, -EINVAL); |
80 | ||
81 | client->cb = cb; | |
82 | client->userdata = userdata; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
5ee482df | 87 | int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) { |
011feef8 PF |
88 | size_t i; |
89 | ||
90 | assert_return(client, -EINVAL); | |
91 | assert_return (client->state == DHCP_STATE_INIT, -EBUSY); | |
92 | ||
93 | switch(option) { | |
94 | case DHCP_OPTION_PAD: | |
95 | case DHCP_OPTION_OVERLOAD: | |
96 | case DHCP_OPTION_MESSAGE_TYPE: | |
97 | case DHCP_OPTION_PARAMETER_REQUEST_LIST: | |
98 | case DHCP_OPTION_END: | |
99 | return -EINVAL; | |
100 | ||
101 | default: | |
102 | break; | |
103 | } | |
104 | ||
105 | for (i = 0; i < client->req_opts_size; i++) | |
106 | if (client->req_opts[i] == option) | |
107 | return -EEXIST; | |
108 | ||
7a7c74ca | 109 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, |
011feef8 PF |
110 | client->req_opts_size + 1)) |
111 | return -ENOMEM; | |
112 | ||
7a7c74ca | 113 | client->req_opts[client->req_opts_size++] = option; |
011feef8 PF |
114 | |
115 | return 0; | |
116 | } | |
117 | ||
118 | int sd_dhcp_client_set_request_address(sd_dhcp_client *client, | |
5ee482df | 119 | const struct in_addr *last_addr) { |
011feef8 PF |
120 | assert_return(client, -EINVAL); |
121 | assert_return(client->state == DHCP_STATE_INIT, -EBUSY); | |
122 | ||
123 | if (last_addr) | |
124 | client->last_addr = last_addr->s_addr; | |
125 | else | |
126 | client->last_addr = INADDR_ANY; | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
5ee482df | 131 | int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) { |
011feef8 PF |
132 | assert_return(client, -EINVAL); |
133 | assert_return(client->state == DHCP_STATE_INIT, -EBUSY); | |
134 | assert_return(interface_index >= -1, -EINVAL); | |
135 | ||
136 | client->index = interface_index; | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
46a66b79 | 141 | int sd_dhcp_client_set_mac(sd_dhcp_client *client, |
5ee482df | 142 | const struct ether_addr *addr) { |
46a66b79 PF |
143 | assert_return(client, -EINVAL); |
144 | assert_return(client->state == DHCP_STATE_INIT, -EBUSY); | |
145 | ||
02ec5cd7 TG |
146 | log_dhcp_client(client, "set MAC address to " |
147 | "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx", | |
148 | addr->ether_addr_octet[0], | |
149 | addr->ether_addr_octet[1], | |
150 | addr->ether_addr_octet[2], | |
151 | addr->ether_addr_octet[3], | |
152 | addr->ether_addr_octet[4], | |
153 | addr->ether_addr_octet[5]); | |
154 | ||
46a66b79 PF |
155 | memcpy(&client->mac_addr, addr, ETH_ALEN); |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
a6cc569e | 160 | int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) { |
751246ee | 161 | assert_return(client, -EINVAL); |
a6cc569e | 162 | assert_return(ret, -EINVAL); |
751246ee | 163 | |
a6cc569e TG |
164 | if (client->state != DHCP_STATE_BOUND && |
165 | client->state != DHCP_STATE_RENEWING && | |
166 | client->state != DHCP_STATE_REBINDING) | |
167 | return -EADDRNOTAVAIL; | |
751246ee | 168 | |
a6cc569e | 169 | *ret = sd_dhcp_lease_ref(client->lease); |
4f882b2a TG |
170 | |
171 | return 0; | |
172 | } | |
173 | ||
5ee482df | 174 | static int client_notify(sd_dhcp_client *client, int event) { |
751246ee PF |
175 | if (client->cb) |
176 | client->cb(client, event, client->userdata); | |
177 | ||
3e3d8f78 PF |
178 | return 0; |
179 | } | |
180 | ||
0f941add | 181 | static int client_initialize(sd_dhcp_client *client) { |
bbdf06d9 | 182 | assert_return(client, -EINVAL); |
bbdf06d9 | 183 | |
8c00042c PF |
184 | client->receive_message = |
185 | sd_event_source_unref(client->receive_message); | |
186 | ||
03e334a1 | 187 | client->fd = safe_close(client->fd); |
8c00042c | 188 | |
d3d8ac2f PF |
189 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
190 | ||
51debc1e PF |
191 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); |
192 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
193 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
194 | ||
e2dfc79f PF |
195 | client->attempt = 1; |
196 | ||
f8fdefe4 | 197 | client->start_time = 0; |
40e39f62 | 198 | client->secs = 0; |
f8fdefe4 | 199 | client->state = DHCP_STATE_INIT; |
0f941add | 200 | client->xid = 0; |
bbdf06d9 | 201 | |
a6cc569e TG |
202 | if (client->lease) |
203 | client->lease = sd_dhcp_lease_unref(client->lease); | |
8c00042c | 204 | |
0f941add PF |
205 | return 0; |
206 | } | |
207 | ||
208 | static int client_stop(sd_dhcp_client *client, int error) { | |
209 | assert_return(client, -EINVAL); | |
210 | ||
211 | client_notify(client, error); | |
212 | ||
213 | client_initialize(client); | |
214 | ||
ee57a737 TG |
215 | log_dhcp_client(client, "STOPPED"); |
216 | ||
bbdf06d9 PF |
217 | return 0; |
218 | } | |
219 | ||
cf597f65 TG |
220 | static int client_message_init(sd_dhcp_client *client, DHCPMessage *message, |
221 | uint8_t type, uint16_t secs, uint8_t **opt, | |
222 | size_t *optlen) { | |
223 | int r; | |
46a66b79 | 224 | |
0a1b6da8 TG |
225 | assert(secs); |
226 | ||
227 | r = dhcp_message_init(message, BOOTREQUEST, client->xid, type, opt, | |
228 | optlen); | |
cf597f65 TG |
229 | if (r < 0) |
230 | return r; | |
46a66b79 | 231 | |
0a1b6da8 TG |
232 | /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers |
233 | refuse to issue an DHCP lease if 'secs' is set to zero */ | |
234 | message->secs = htobe16(secs); | |
235 | ||
cf597f65 | 236 | memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN); |
f5a70de7 | 237 | |
3dd71400 PF |
238 | if (client->state == DHCP_STATE_RENEWING || |
239 | client->state == DHCP_STATE_REBINDING) | |
aba26854 PF |
240 | message->ciaddr = client->lease->address; |
241 | ||
ee57a737 | 242 | /* Some DHCP servers will refuse to issue an DHCP lease if the Client |
46a66b79 | 243 | Identifier option is not set */ |
cf597f65 TG |
244 | r = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER, |
245 | ETH_ALEN, &client->mac_addr); | |
246 | if (r < 0) | |
247 | return r; | |
46a66b79 PF |
248 | |
249 | if (type == DHCP_DISCOVER || type == DHCP_REQUEST) { | |
cf597f65 TG |
250 | be16_t max_size; |
251 | ||
252 | r = dhcp_option_append(opt, optlen, | |
253 | DHCP_OPTION_PARAMETER_REQUEST_LIST, | |
254 | client->req_opts_size, | |
255 | client->req_opts); | |
256 | if (r < 0) | |
257 | return r; | |
564ba3b0 PF |
258 | |
259 | /* Some DHCP servers will send bigger DHCP packets than the | |
260 | defined default size unless the Maximum Messge Size option | |
261 | is explicitely set */ | |
262 | max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE + | |
0bfedf14 | 263 | DHCP_MIN_OPTIONS_SIZE); |
cf597f65 TG |
264 | r = dhcp_option_append(opt, optlen, |
265 | DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, | |
266 | 2, &max_size); | |
267 | if (r < 0) | |
268 | return r; | |
46a66b79 PF |
269 | } |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
63edaa62 TG |
274 | static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet, |
275 | size_t len) { | |
276 | dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT, | |
277 | INADDR_BROADCAST, DHCP_PORT_SERVER, len); | |
278 | ||
279 | return dhcp_network_send_raw_socket(client->fd, &client->link, | |
280 | packet, len); | |
281 | } | |
282 | ||
5ee482df | 283 | static int client_send_discover(sd_dhcp_client *client, uint16_t secs) { |
46a66b79 PF |
284 | int err = 0; |
285 | _cleanup_free_ DHCPPacket *discover; | |
286 | size_t optlen, len; | |
287 | uint8_t *opt; | |
288 | ||
0bfedf14 | 289 | optlen = DHCP_MIN_OPTIONS_SIZE; |
46a66b79 PF |
290 | len = sizeof(DHCPPacket) + optlen; |
291 | ||
292 | discover = malloc0(len); | |
293 | ||
294 | if (!discover) | |
295 | return -ENOMEM; | |
296 | ||
cf597f65 TG |
297 | err = client_message_init(client, &discover->dhcp, DHCP_DISCOVER, |
298 | secs, &opt, &optlen); | |
46a66b79 PF |
299 | if (err < 0) |
300 | return err; | |
301 | ||
302 | if (client->last_addr != INADDR_ANY) { | |
303 | err = dhcp_option_append(&opt, &optlen, | |
304 | DHCP_OPTION_REQUESTED_IP_ADDRESS, | |
305 | 4, &client->last_addr); | |
306 | if (err < 0) | |
307 | return err; | |
308 | } | |
309 | ||
310 | err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL); | |
311 | if (err < 0) | |
312 | return err; | |
313 | ||
63edaa62 TG |
314 | err = dhcp_client_send_raw(client, discover, len); |
315 | if (err < 0) | |
316 | return err; | |
e2dfc79f | 317 | |
ee57a737 TG |
318 | log_dhcp_client(client, "DISCOVER"); |
319 | ||
63edaa62 | 320 | return 0; |
e2dfc79f PF |
321 | } |
322 | ||
5ee482df | 323 | static int client_send_request(sd_dhcp_client *client, uint16_t secs) { |
e2dfc79f PF |
324 | _cleanup_free_ DHCPPacket *request; |
325 | size_t optlen, len; | |
326 | int err; | |
327 | uint8_t *opt; | |
328 | ||
0bfedf14 | 329 | optlen = DHCP_MIN_OPTIONS_SIZE; |
279efc70 | 330 | len = sizeof(DHCPPacket) + optlen; |
e2dfc79f PF |
331 | |
332 | request = malloc0(len); | |
333 | if (!request) | |
334 | return -ENOMEM; | |
335 | ||
cf597f65 TG |
336 | err = client_message_init(client, &request->dhcp, DHCP_REQUEST, secs, |
337 | &opt, &optlen); | |
e2dfc79f PF |
338 | if (err < 0) |
339 | return err; | |
46a66b79 | 340 | |
8b1243f7 PF |
341 | switch (client->state) { |
342 | ||
343 | case DHCP_STATE_INIT_REBOOT: | |
344 | err = dhcp_option_append(&opt, &optlen, | |
345 | DHCP_OPTION_REQUESTED_IP_ADDRESS, | |
346 | 4, &client->last_addr); | |
347 | if (err < 0) | |
348 | return err; | |
349 | break; | |
350 | ||
351 | case DHCP_STATE_REQUESTING: | |
e2dfc79f PF |
352 | err = dhcp_option_append(&opt, &optlen, |
353 | DHCP_OPTION_REQUESTED_IP_ADDRESS, | |
354 | 4, &client->lease->address); | |
355 | if (err < 0) | |
356 | return err; | |
46a66b79 | 357 | |
e2dfc79f PF |
358 | err = dhcp_option_append(&opt, &optlen, |
359 | DHCP_OPTION_SERVER_IDENTIFIER, | |
360 | 4, &client->lease->server_address); | |
361 | if (err < 0) | |
362 | return err; | |
8b1243f7 PF |
363 | break; |
364 | ||
365 | case DHCP_STATE_INIT: | |
366 | case DHCP_STATE_SELECTING: | |
367 | case DHCP_STATE_REBOOTING: | |
368 | case DHCP_STATE_BOUND: | |
369 | case DHCP_STATE_RENEWING: | |
370 | case DHCP_STATE_REBINDING: | |
371 | ||
372 | break; | |
e2dfc79f | 373 | } |
46a66b79 | 374 | |
e2dfc79f PF |
375 | err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL); |
376 | if (err < 0) | |
377 | return err; | |
46a66b79 | 378 | |
aba26854 PF |
379 | if (client->state == DHCP_STATE_RENEWING) { |
380 | err = dhcp_network_send_udp_socket(client->fd, | |
381 | client->lease->server_address, | |
080ab276 | 382 | DHCP_PORT_SERVER, |
aba26854 PF |
383 | &request->dhcp, |
384 | len - DHCP_IP_UDP_SIZE); | |
385 | } else { | |
63edaa62 | 386 | err = dhcp_client_send_raw(client, request, len); |
aba26854 | 387 | } |
63edaa62 TG |
388 | if (err < 0) |
389 | return err; | |
46a66b79 | 390 | |
ee57a737 TG |
391 | log_dhcp_client(client, "REQUEST"); |
392 | ||
63edaa62 | 393 | return 0; |
46a66b79 PF |
394 | } |
395 | ||
40e39f62 PF |
396 | static uint16_t client_update_secs(sd_dhcp_client *client, usec_t time_now) |
397 | { | |
c6f7b693 | 398 | client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1; |
40e39f62 PF |
399 | |
400 | return client->secs; | |
401 | } | |
402 | ||
d3d8ac2f | 403 | static int client_timeout_resend(sd_event_source *s, uint64_t usec, |
5ee482df | 404 | void *userdata) { |
d3d8ac2f | 405 | sd_dhcp_client *client = userdata; |
aba26854 | 406 | usec_t next_timeout = 0; |
d23c45bf | 407 | uint64_t time_now; |
aba26854 | 408 | uint32_t time_left; |
d23c45bf | 409 | int r; |
b25ef18b TG |
410 | |
411 | assert(s); | |
412 | assert(client); | |
413 | assert(client->event); | |
d3d8ac2f | 414 | |
d23c45bf TG |
415 | r = sd_event_get_now_monotonic(client->event, &time_now); |
416 | if (r < 0) | |
417 | goto error; | |
418 | ||
aba26854 PF |
419 | switch (client->state) { |
420 | case DHCP_STATE_RENEWING: | |
421 | ||
e5002702 | 422 | time_left = (client->lease->t2 - client->lease->t1) / 2; |
aba26854 PF |
423 | if (time_left < 60) |
424 | time_left = 60; | |
d3d8ac2f | 425 | |
d23c45bf | 426 | next_timeout = time_now + time_left * USEC_PER_SEC; |
d3d8ac2f | 427 | |
aba26854 PF |
428 | break; |
429 | ||
3dd71400 PF |
430 | case DHCP_STATE_REBINDING: |
431 | ||
e5002702 | 432 | time_left = (client->lease->lifetime - client->lease->t2) / 2; |
3dd71400 PF |
433 | if (time_left < 60) |
434 | time_left = 60; | |
435 | ||
d23c45bf | 436 | next_timeout = time_now + time_left * USEC_PER_SEC; |
3dd71400 PF |
437 | break; |
438 | ||
8b1243f7 PF |
439 | case DHCP_STATE_REBOOTING: |
440 | /* start over as we did not receive a timely ack or nak */ | |
441 | client->state = DHCP_STATE_INIT; | |
442 | client->attempt = 1; | |
443 | client->xid = random_u32(); | |
444 | ||
445 | /* fall through */ | |
aba26854 PF |
446 | case DHCP_STATE_INIT: |
447 | case DHCP_STATE_INIT_REBOOT: | |
aba26854 PF |
448 | case DHCP_STATE_SELECTING: |
449 | case DHCP_STATE_REQUESTING: | |
450 | case DHCP_STATE_BOUND: | |
aba26854 PF |
451 | |
452 | if (client->attempt < 64) | |
453 | client->attempt *= 2; | |
454 | ||
d23c45bf | 455 | next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC; |
aba26854 PF |
456 | |
457 | break; | |
458 | } | |
459 | ||
9bf3b535 | 460 | next_timeout += (random_u32() & 0x1fffff); |
d3d8ac2f | 461 | |
2333154a UTL |
462 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
463 | ||
151b9b96 LP |
464 | r = sd_event_add_monotonic(client->event, |
465 | &client->timeout_resend, | |
466 | next_timeout, | |
e2dfc79f | 467 | 10 * USEC_PER_MSEC, |
151b9b96 | 468 | client_timeout_resend, client); |
b25ef18b TG |
469 | if (r < 0) |
470 | goto error; | |
471 | ||
e5002702 TG |
472 | r = sd_event_source_set_priority(client->timeout_resend, |
473 | client->event_priority); | |
b25ef18b | 474 | if (r < 0) |
e2dfc79f | 475 | goto error; |
d3d8ac2f | 476 | |
e2dfc79f PF |
477 | switch (client->state) { |
478 | case DHCP_STATE_INIT: | |
40e39f62 | 479 | |
d23c45bf | 480 | client_update_secs(client, time_now); |
40e39f62 PF |
481 | |
482 | r = client_send_discover(client, client->secs); | |
b25ef18b | 483 | if (r >= 0) { |
e2dfc79f PF |
484 | client->state = DHCP_STATE_SELECTING; |
485 | client->attempt = 1; | |
486 | } else { | |
487 | if (client->attempt >= 64) | |
488 | goto error; | |
489 | } | |
490 | ||
491 | break; | |
492 | ||
493 | case DHCP_STATE_SELECTING: | |
d23c45bf | 494 | client_update_secs(client, time_now); |
40e39f62 PF |
495 | |
496 | r = client_send_discover(client, client->secs); | |
b25ef18b | 497 | if (r < 0 && client->attempt >= 64) |
d3d8ac2f PF |
498 | goto error; |
499 | ||
e2dfc79f PF |
500 | break; |
501 | ||
8b1243f7 | 502 | case DHCP_STATE_INIT_REBOOT: |
e2dfc79f | 503 | case DHCP_STATE_REQUESTING: |
aba26854 | 504 | case DHCP_STATE_RENEWING: |
3dd71400 | 505 | case DHCP_STATE_REBINDING: |
40e39f62 | 506 | r = client_send_request(client, client->secs); |
b25ef18b | 507 | if (r < 0 && client->attempt >= 64) |
e2dfc79f | 508 | goto error; |
d3d8ac2f | 509 | |
8b1243f7 PF |
510 | if (client->state == DHCP_STATE_INIT_REBOOT) |
511 | client->state = DHCP_STATE_REBOOTING; | |
512 | ||
d23c45bf | 513 | client->request_sent = time_now; |
51debc1e | 514 | |
d3d8ac2f PF |
515 | break; |
516 | ||
d3d8ac2f | 517 | case DHCP_STATE_REBOOTING: |
d3d8ac2f | 518 | case DHCP_STATE_BOUND: |
d3d8ac2f PF |
519 | |
520 | break; | |
521 | } | |
522 | ||
523 | return 0; | |
524 | ||
525 | error: | |
b25ef18b | 526 | client_stop(client, r); |
d3d8ac2f PF |
527 | |
528 | /* Errors were dealt with when stopping the client, don't spill | |
529 | errors into the event loop handler */ | |
530 | return 0; | |
531 | } | |
532 | ||
e5002702 | 533 | static int client_initialize_events(sd_dhcp_client *client, |
d23c45bf | 534 | sd_event_io_handler_t io_callback) { |
6a1cd41e PF |
535 | int r; |
536 | ||
b25ef18b TG |
537 | assert(client); |
538 | assert(client->event); | |
539 | ||
151b9b96 LP |
540 | r = sd_event_add_io(client->event, &client->receive_message, |
541 | client->fd, EPOLLIN, io_callback, | |
542 | client); | |
6a1cd41e PF |
543 | if (r < 0) |
544 | goto error; | |
545 | ||
e5002702 TG |
546 | r = sd_event_source_set_priority(client->receive_message, |
547 | client->event_priority); | |
b25ef18b TG |
548 | if (r < 0) |
549 | goto error; | |
550 | ||
2333154a UTL |
551 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
552 | ||
151b9b96 | 553 | r = sd_event_add_monotonic(client->event, |
d23c45bf | 554 | &client->timeout_resend, 0, 0, |
151b9b96 | 555 | client_timeout_resend, client); |
b25ef18b TG |
556 | if (r < 0) |
557 | goto error; | |
558 | ||
e5002702 TG |
559 | r = sd_event_source_set_priority(client->timeout_resend, |
560 | client->event_priority); | |
6a1cd41e PF |
561 | |
562 | error: | |
563 | if (r < 0) | |
564 | client_stop(client, r); | |
565 | ||
566 | return 0; | |
567 | ||
568 | } | |
569 | ||
0f941add PF |
570 | static int client_start(sd_dhcp_client *client) { |
571 | int r; | |
572 | ||
573 | assert_return(client, -EINVAL); | |
574 | assert_return(client->event, -EINVAL); | |
575 | assert_return(client->index > 0, -EINVAL); | |
576 | assert_return(client->fd < 0, -EBUSY); | |
577 | assert_return(client->xid == 0, -EINVAL); | |
578 | assert_return(client->state == DHCP_STATE_INIT || | |
579 | client->state == DHCP_STATE_INIT_REBOOT, -EBUSY); | |
580 | ||
581 | client->xid = random_u32(); | |
582 | ||
583 | r = dhcp_network_bind_raw_socket(client->index, &client->link); | |
584 | ||
585 | if (r < 0) { | |
586 | client_stop(client, r); | |
587 | return r; | |
588 | } | |
589 | ||
590 | client->fd = r; | |
591 | client->start_time = now(CLOCK_MONOTONIC); | |
592 | client->secs = 0; | |
593 | ||
594 | log_dhcp_client(client, "STARTED"); | |
595 | ||
596 | return client_initialize_events(client, client_receive_message_raw); | |
597 | } | |
598 | ||
51debc1e | 599 | static int client_timeout_expire(sd_event_source *s, uint64_t usec, |
5ee482df | 600 | void *userdata) { |
751246ee PF |
601 | sd_dhcp_client *client = userdata; |
602 | ||
ee57a737 TG |
603 | log_dhcp_client(client, "EXPIRED"); |
604 | ||
0f941add PF |
605 | client_notify(client, DHCP_EVENT_EXPIRED); |
606 | ||
607 | /* start over as the lease was lost */ | |
608 | client_initialize(client); | |
609 | client_start(client); | |
751246ee | 610 | |
51debc1e PF |
611 | return 0; |
612 | } | |
613 | ||
5ee482df | 614 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
3dd71400 PF |
615 | sd_dhcp_client *client = userdata; |
616 | int r; | |
617 | ||
03e334a1 LP |
618 | client->receive_message = sd_event_source_unref(client->receive_message); |
619 | client->fd = safe_close(client->fd); | |
3dd71400 PF |
620 | |
621 | client->state = DHCP_STATE_REBINDING; | |
622 | client->attempt = 1; | |
623 | ||
624 | r = dhcp_network_bind_raw_socket(client->index, &client->link); | |
625 | if (r < 0) { | |
626 | client_stop(client, r); | |
627 | return 0; | |
628 | } | |
629 | ||
630 | client->fd = r; | |
631 | ||
ee57a737 TG |
632 | log_dhcp_client(client, "TIMEOUT T2"); |
633 | ||
d23c45bf | 634 | return client_initialize_events(client, client_receive_message_raw); |
51debc1e PF |
635 | } |
636 | ||
e5002702 TG |
637 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, |
638 | void *userdata) { | |
aba26854 PF |
639 | sd_dhcp_client *client = userdata; |
640 | int r; | |
641 | ||
642 | client->state = DHCP_STATE_RENEWING; | |
643 | client->attempt = 1; | |
644 | ||
645 | r = dhcp_network_bind_udp_socket(client->index, | |
080ab276 TG |
646 | client->lease->address, |
647 | DHCP_PORT_CLIENT); | |
6a1cd41e PF |
648 | if (r < 0) { |
649 | client_stop(client, r); | |
650 | return 0; | |
651 | } | |
aba26854 PF |
652 | |
653 | client->fd = r; | |
aba26854 | 654 | |
ee57a737 TG |
655 | log_dhcp_client(client, "TIMEOUT T1"); |
656 | ||
d23c45bf | 657 | return client_initialize_events(client, client_receive_message_udp); |
51debc1e PF |
658 | } |
659 | ||
e5002702 TG |
660 | static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, |
661 | size_t len) { | |
a6cc569e | 662 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; |
5ee482df | 663 | int r; |
3e3d8f78 | 664 | |
a6cc569e TG |
665 | r = dhcp_lease_new(&lease); |
666 | if (r < 0) | |
667 | return r; | |
8c00042c | 668 | |
e5002702 | 669 | r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease); |
5ee482df TG |
670 | if (r != DHCP_OFFER) |
671 | return -ENOMSG; | |
8c00042c | 672 | |
8e34a618 TG |
673 | lease->next_server = offer->siaddr; |
674 | ||
e5002702 | 675 | lease->address = offer->yiaddr; |
8c00042c PF |
676 | |
677 | if (lease->address == INADDR_ANY || | |
678 | lease->server_address == INADDR_ANY || | |
679 | lease->subnet_mask == INADDR_ANY || | |
680 | lease->lifetime == 0) | |
5ee482df | 681 | return -ENOMSG; |
8c00042c PF |
682 | |
683 | client->lease = lease; | |
5ee482df | 684 | lease = NULL; |
8c00042c | 685 | |
ee57a737 TG |
686 | log_dhcp_client(client, "OFFER"); |
687 | ||
8c00042c | 688 | return 0; |
8c00042c PF |
689 | } |
690 | ||
e5002702 TG |
691 | static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, |
692 | size_t len) { | |
a6cc569e | 693 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; |
5ee482df | 694 | int r; |
3e3d8f78 | 695 | |
a6cc569e TG |
696 | r = dhcp_lease_new(&lease); |
697 | if (r < 0) | |
698 | return r; | |
3e3d8f78 | 699 | |
e5002702 | 700 | r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease); |
ee57a737 TG |
701 | if (r == DHCP_NAK) { |
702 | log_dhcp_client(client, "NAK"); | |
5ee482df | 703 | return DHCP_EVENT_NO_LEASE; |
ee57a737 | 704 | } |
3e3d8f78 | 705 | |
5ee482df TG |
706 | if (r != DHCP_ACK) |
707 | return -ENOMSG; | |
3e3d8f78 | 708 | |
8e34a618 TG |
709 | lease->next_server = ack->siaddr; |
710 | ||
e5002702 | 711 | lease->address = ack->yiaddr; |
3e3d8f78 PF |
712 | |
713 | if (lease->address == INADDR_ANY || | |
714 | lease->server_address == INADDR_ANY || | |
5ee482df TG |
715 | lease->subnet_mask == INADDR_ANY || lease->lifetime == 0) |
716 | return -ENOMSG; | |
3e3d8f78 PF |
717 | |
718 | r = DHCP_EVENT_IP_ACQUIRE; | |
719 | if (client->lease) { | |
720 | if (client->lease->address != lease->address || | |
721 | client->lease->subnet_mask != lease->subnet_mask || | |
722 | client->lease->router != lease->router) { | |
723 | r = DHCP_EVENT_IP_CHANGE; | |
724 | } | |
725 | ||
a6cc569e | 726 | client->lease = sd_dhcp_lease_unref(client->lease); |
3e3d8f78 PF |
727 | } |
728 | ||
729 | client->lease = lease; | |
5ee482df | 730 | lease = NULL; |
3e3d8f78 | 731 | |
ee57a737 TG |
732 | log_dhcp_client(client, "ACK"); |
733 | ||
3e3d8f78 PF |
734 | return r; |
735 | } | |
736 | ||
51debc1e | 737 | static uint64_t client_compute_timeout(uint64_t request_sent, |
5ee482df | 738 | uint32_t lifetime) { |
51debc1e | 739 | return request_sent + (lifetime - 3) * USEC_PER_SEC + |
9bf3b535 | 740 | + (random_u32() & 0x1fffff); |
51debc1e PF |
741 | } |
742 | ||
5ee482df | 743 | static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) { |
51debc1e | 744 | uint64_t next_timeout; |
5ee482df | 745 | int r; |
51debc1e | 746 | |
b25ef18b TG |
747 | assert(client); |
748 | assert(client->event); | |
749 | ||
51debc1e PF |
750 | if (client->lease->lifetime < 10) |
751 | return -EINVAL; | |
752 | ||
aba26854 PF |
753 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); |
754 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
755 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
756 | ||
51debc1e PF |
757 | if (!client->lease->t1) |
758 | client->lease->t1 = client->lease->lifetime / 2; | |
759 | ||
760 | next_timeout = client_compute_timeout(client->request_sent, | |
761 | client->lease->t1); | |
762 | if (next_timeout < usec) | |
763 | return -EINVAL; | |
764 | ||
151b9b96 | 765 | r = sd_event_add_monotonic(client->event, |
d23c45bf TG |
766 | &client->timeout_t1, |
767 | next_timeout, | |
768 | 10 * USEC_PER_MSEC, | |
769 | client_timeout_t1, client); | |
5ee482df TG |
770 | if (r < 0) |
771 | return r; | |
51debc1e | 772 | |
e5002702 TG |
773 | r = sd_event_source_set_priority(client->timeout_t1, |
774 | client->event_priority); | |
b25ef18b TG |
775 | if (r < 0) |
776 | return r; | |
777 | ||
51debc1e PF |
778 | if (!client->lease->t2) |
779 | client->lease->t2 = client->lease->lifetime * 7 / 8; | |
780 | ||
781 | if (client->lease->t2 < client->lease->t1) | |
782 | return -EINVAL; | |
783 | ||
784 | if (client->lease->lifetime < client->lease->t2) | |
785 | return -EINVAL; | |
786 | ||
787 | next_timeout = client_compute_timeout(client->request_sent, | |
788 | client->lease->t2); | |
789 | if (next_timeout < usec) | |
790 | return -EINVAL; | |
791 | ||
151b9b96 | 792 | r = sd_event_add_monotonic(client->event, |
d23c45bf TG |
793 | &client->timeout_t2, |
794 | next_timeout, | |
795 | 10 * USEC_PER_MSEC, | |
796 | client_timeout_t2, client); | |
5ee482df TG |
797 | if (r < 0) |
798 | return r; | |
51debc1e | 799 | |
e5002702 TG |
800 | r = sd_event_source_set_priority(client->timeout_t2, |
801 | client->event_priority); | |
b25ef18b TG |
802 | if (r < 0) |
803 | return r; | |
804 | ||
51debc1e PF |
805 | next_timeout = client_compute_timeout(client->request_sent, |
806 | client->lease->lifetime); | |
807 | if (next_timeout < usec) | |
808 | return -EINVAL; | |
809 | ||
151b9b96 | 810 | r = sd_event_add_monotonic(client->event, |
d23c45bf TG |
811 | &client->timeout_expire, next_timeout, |
812 | 10 * USEC_PER_MSEC, | |
813 | client_timeout_expire, client); | |
5ee482df TG |
814 | if (r < 0) |
815 | return r; | |
51debc1e | 816 | |
e5002702 TG |
817 | r = sd_event_source_set_priority(client->timeout_expire, |
818 | client->event_priority); | |
b25ef18b TG |
819 | if (r < 0) |
820 | return r; | |
821 | ||
51debc1e PF |
822 | return 0; |
823 | } | |
824 | ||
e5002702 TG |
825 | static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, |
826 | int len, usec_t time_now) { | |
827 | int r = 0, notify_event = 0; | |
8c00042c | 828 | |
b25ef18b TG |
829 | assert(client); |
830 | assert(client->event); | |
e5002702 | 831 | assert(message); |
b25ef18b | 832 | |
06b44be7 TG |
833 | if (len < DHCP_MESSAGE_SIZE) { |
834 | log_dhcp_client(client, "message too small (%d bytes): " | |
835 | "ignoring", len); | |
9fadd4ca | 836 | return 0; |
06b44be7 TG |
837 | } |
838 | ||
839 | if (message->op != BOOTREPLY) { | |
840 | log_dhcp_client(client, "not a BOOTREPLY message: ignoring"); | |
841 | return 0; | |
842 | } | |
843 | ||
844 | if (be32toh(message->xid) != client->xid) { | |
845 | log_dhcp_client(client, "received xid (%u) does not match " | |
846 | "expected (%u): ignoring", | |
847 | be32toh(message->xid), client->xid); | |
848 | return 0; | |
849 | } | |
e2dfc79f | 850 | |
e5002702 | 851 | if (memcmp(&message->chaddr[0], &client->mac_addr.ether_addr_octet, |
06b44be7 TG |
852 | ETHER_ADDR_LEN)) { |
853 | log_dhcp_client(client, "received chaddr does not match " | |
854 | "expected: ignoring"); | |
9fadd4ca | 855 | return 0; |
06b44be7 | 856 | } |
8c00042c | 857 | |
8c00042c PF |
858 | switch (client->state) { |
859 | case DHCP_STATE_SELECTING: | |
860 | ||
e5002702 TG |
861 | r = client_handle_offer(client, message, len); |
862 | if (r >= 0) { | |
8c00042c | 863 | |
8c00042c PF |
864 | client->timeout_resend = |
865 | sd_event_source_unref(client->timeout_resend); | |
866 | ||
867 | client->state = DHCP_STATE_REQUESTING; | |
e2dfc79f PF |
868 | client->attempt = 1; |
869 | ||
151b9b96 | 870 | r = sd_event_add_monotonic(client->event, |
d23c45bf TG |
871 | &client->timeout_resend, 0, |
872 | 0, client_timeout_resend, | |
151b9b96 | 873 | client); |
3e3d8f78 | 874 | if (r < 0) |
e2dfc79f | 875 | goto error; |
b25ef18b | 876 | |
e5002702 TG |
877 | r = sd_event_source_set_priority(client->timeout_resend, |
878 | client->event_priority); | |
b25ef18b TG |
879 | if (r < 0) |
880 | goto error; | |
8c00042c PF |
881 | } |
882 | ||
883 | break; | |
884 | ||
8b1243f7 | 885 | case DHCP_STATE_REBOOTING: |
3e3d8f78 | 886 | case DHCP_STATE_REQUESTING: |
aba26854 | 887 | case DHCP_STATE_RENEWING: |
3dd71400 | 888 | case DHCP_STATE_REBINDING: |
aba26854 | 889 | |
e5002702 | 890 | r = client_handle_ack(client, message, len); |
3e3d8f78 | 891 | |
8b1243f7 PF |
892 | if (r == DHCP_EVENT_NO_LEASE) { |
893 | ||
894 | client->timeout_resend = | |
895 | sd_event_source_unref(client->timeout_resend); | |
896 | ||
897 | if (client->state == DHCP_STATE_REBOOTING) { | |
898 | r = client_initialize(client); | |
899 | if (r < 0) | |
900 | goto error; | |
901 | ||
902 | r = client_start(client); | |
903 | if (r < 0) | |
904 | goto error; | |
905 | } | |
906 | ||
3e3d8f78 | 907 | goto error; |
8b1243f7 | 908 | } |
3e3d8f78 PF |
909 | |
910 | if (r >= 0) { | |
911 | client->timeout_resend = | |
912 | sd_event_source_unref(client->timeout_resend); | |
913 | ||
8b1243f7 PF |
914 | if (IN_SET(client->state, DHCP_STATE_REQUESTING, |
915 | DHCP_STATE_REBOOTING)) | |
aba26854 PF |
916 | notify_event = DHCP_EVENT_IP_ACQUIRE; |
917 | else if (r != DHCP_EVENT_IP_ACQUIRE) | |
918 | notify_event = r; | |
919 | ||
3e3d8f78 PF |
920 | client->state = DHCP_STATE_BOUND; |
921 | client->attempt = 1; | |
922 | ||
923 | client->last_addr = client->lease->address; | |
924 | ||
51debc1e | 925 | r = client_set_lease_timeouts(client, time_now); |
aba26854 | 926 | if (r < 0) |
51debc1e PF |
927 | goto error; |
928 | ||
aba26854 PF |
929 | if (notify_event) |
930 | client_notify(client, notify_event); | |
3e3d8f78 | 931 | |
3e3d8f78 PF |
932 | client->receive_message = |
933 | sd_event_source_unref(client->receive_message); | |
03e334a1 | 934 | client->fd = safe_close(client->fd); |
3e3d8f78 | 935 | } |
97b9372d PF |
936 | |
937 | r = 0; | |
938 | ||
3e3d8f78 PF |
939 | break; |
940 | ||
8c00042c PF |
941 | case DHCP_STATE_INIT: |
942 | case DHCP_STATE_INIT_REBOOT: | |
8c00042c | 943 | case DHCP_STATE_BOUND: |
8c00042c PF |
944 | |
945 | break; | |
946 | } | |
947 | ||
948 | error: | |
97b9372d | 949 | if (r < 0 || r == DHCP_EVENT_NO_LEASE) |
3e3d8f78 | 950 | return client_stop(client, r); |
e2dfc79f | 951 | |
8c00042c PF |
952 | return 0; |
953 | } | |
954 | ||
8f61afd8 | 955 | static int client_receive_message_udp(sd_event_source *s, int fd, |
e5002702 TG |
956 | uint32_t revents, void *userdata) { |
957 | sd_dhcp_client *client = userdata; | |
5266a81e TG |
958 | _cleanup_free_ DHCPMessage *message = NULL; |
959 | int buflen = 0, len, r; | |
e5002702 TG |
960 | usec_t time_now; |
961 | ||
962 | assert(s); | |
963 | assert(client); | |
964 | assert(client->event); | |
965 | ||
5266a81e TG |
966 | r = ioctl(fd, FIONREAD, &buflen); |
967 | if (r < 0 || buflen <= 0) | |
968 | buflen = sizeof(DHCPMessage) + DHCP_MIN_OPTIONS_SIZE; | |
969 | ||
970 | message = malloc0(buflen); | |
971 | if (!message) | |
972 | return -ENOMEM; | |
973 | ||
974 | len = read(fd, message, buflen); | |
e5002702 TG |
975 | if (len < 0) |
976 | return 0; | |
977 | ||
978 | r = sd_event_get_now_monotonic(client->event, &time_now); | |
979 | if (r < 0) | |
980 | return client_stop(client, r); | |
981 | ||
5266a81e | 982 | return client_handle_message(client, message, len, |
e5002702 TG |
983 | time_now); |
984 | } | |
985 | ||
8f61afd8 | 986 | static int client_receive_message_raw(sd_event_source *s, int fd, |
e5002702 TG |
987 | uint32_t revents, void *userdata) { |
988 | sd_dhcp_client *client = userdata; | |
5266a81e | 989 | _cleanup_free_ DHCPPacket *packet = NULL; |
e5002702 | 990 | usec_t time_now; |
55dab2ed TG |
991 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; |
992 | struct iovec iov = {}; | |
993 | struct msghdr msg = { | |
994 | .msg_iov = &iov, | |
995 | .msg_iovlen = 1, | |
996 | .msg_control = cmsgbuf, | |
997 | .msg_controllen = sizeof(cmsgbuf), | |
998 | }; | |
999 | struct cmsghdr *cmsg; | |
1000 | bool checksum = true; | |
1001 | int buflen = 0, len, r; | |
e5002702 TG |
1002 | |
1003 | assert(s); | |
1004 | assert(client); | |
1005 | assert(client->event); | |
1006 | ||
5266a81e TG |
1007 | r = ioctl(fd, FIONREAD, &buflen); |
1008 | if (r < 0 || buflen <= 0) | |
1009 | buflen = sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE; | |
1010 | ||
1011 | packet = malloc0(buflen); | |
1012 | if (!packet) | |
1013 | return -ENOMEM; | |
1014 | ||
55dab2ed TG |
1015 | iov.iov_base = packet; |
1016 | iov.iov_len = buflen; | |
1017 | ||
1018 | len = recvmsg(fd, &msg, 0); | |
1019 | if (len < 0) { | |
1020 | log_dhcp_client(client, "could not receive message from raw " | |
1021 | "socket: %s", strerror(errno)); | |
e5002702 | 1022 | return 0; |
55dab2ed TG |
1023 | } |
1024 | ||
1025 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { | |
1026 | if (cmsg->cmsg_level == SOL_PACKET && cmsg->cmsg_type == PACKET_AUXDATA) { | |
1027 | struct tpacket_auxdata *aux = (void *)CMSG_DATA(cmsg); | |
1028 | ||
1029 | checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY); | |
1030 | break; | |
1031 | } | |
1032 | } | |
e5002702 | 1033 | |
55dab2ed | 1034 | r = dhcp_packet_verify_headers(packet, len, checksum); |
ac4f16ab | 1035 | if (r < 0) |
9fadd4ca | 1036 | return 0; |
e5002702 TG |
1037 | |
1038 | len -= DHCP_IP_UDP_SIZE; | |
1039 | ||
1040 | r = sd_event_get_now_monotonic(client->event, &time_now); | |
1041 | if (r < 0) | |
1042 | return client_stop(client, r); | |
1043 | ||
1044 | return client_handle_message(client, &packet->dhcp, len, time_now); | |
1045 | } | |
1046 | ||
5ee482df | 1047 | int sd_dhcp_client_start(sd_dhcp_client *client) { |
6a1cd41e | 1048 | int r; |
d3d8ac2f | 1049 | |
46a66b79 | 1050 | assert_return(client, -EINVAL); |
46a66b79 | 1051 | |
0f941add PF |
1052 | r = client_initialize(client); |
1053 | if (r < 0) | |
6a1cd41e | 1054 | return r; |
8c00042c | 1055 | |
0f941add PF |
1056 | if (client->last_addr) |
1057 | client->state = DHCP_STATE_INIT_REBOOT; | |
d3d8ac2f | 1058 | |
0f941add | 1059 | return client_start(client); |
46a66b79 PF |
1060 | } |
1061 | ||
5ee482df | 1062 | int sd_dhcp_client_stop(sd_dhcp_client *client) { |
751246ee | 1063 | return client_stop(client, DHCP_EVENT_STOP); |
bbdf06d9 PF |
1064 | } |
1065 | ||
e5002702 TG |
1066 | int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, |
1067 | int priority) { | |
b25ef18b TG |
1068 | int r; |
1069 | ||
1070 | assert_return(client, -EINVAL); | |
1071 | assert_return(!client->event, -EBUSY); | |
1072 | ||
1073 | if (event) | |
1074 | client->event = sd_event_ref(event); | |
1075 | else { | |
1076 | r = sd_event_default(&client->event); | |
1077 | if (r < 0) | |
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | client->event_priority = priority; | |
1082 | ||
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | int sd_dhcp_client_detach_event(sd_dhcp_client *client) { | |
1087 | assert_return(client, -EINVAL); | |
1088 | ||
1089 | client->event = sd_event_unref(client->event); | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
1094 | sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { | |
1095 | if (!client) | |
1096 | return NULL; | |
1097 | ||
1098 | return client->event; | |
1099 | } | |
1100 | ||
1101 | void sd_dhcp_client_free(sd_dhcp_client *client) { | |
1102 | if (!client) | |
1103 | return; | |
d2fe46b5 PF |
1104 | |
1105 | sd_dhcp_client_stop(client); | |
b25ef18b | 1106 | sd_dhcp_client_detach_event(client); |
d2fe46b5 | 1107 | |
d2fe46b5 PF |
1108 | free(client->req_opts); |
1109 | free(client); | |
d2fe46b5 PF |
1110 | } |
1111 | ||
b25ef18b TG |
1112 | DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free); |
1113 | #define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep) | |
1114 | ||
1115 | int sd_dhcp_client_new(sd_dhcp_client **ret) { | |
1116 | _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL; | |
011feef8 | 1117 | |
b25ef18b | 1118 | assert_return(ret, -EINVAL); |
d3d8ac2f | 1119 | |
011feef8 PF |
1120 | client = new0(sd_dhcp_client, 1); |
1121 | if (!client) | |
b25ef18b | 1122 | return -ENOMEM; |
011feef8 PF |
1123 | |
1124 | client->state = DHCP_STATE_INIT; | |
1125 | client->index = -1; | |
8c00042c | 1126 | client->fd = -1; |
e2dfc79f | 1127 | client->attempt = 1; |
011feef8 PF |
1128 | |
1129 | client->req_opts_size = ELEMENTSOF(default_req_opts); | |
1130 | ||
1131 | client->req_opts = memdup(default_req_opts, client->req_opts_size); | |
b25ef18b TG |
1132 | if (!client->req_opts) |
1133 | return -ENOMEM; | |
1134 | ||
1135 | *ret = client; | |
1136 | client = NULL; | |
011feef8 | 1137 | |
b25ef18b | 1138 | return 0; |
011feef8 | 1139 | } |