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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> |
3b7ca119 | 25 | #include <net/if_arp.h> |
63175195 | 26 | #include <netinet/ether.h> |
aba26854 | 27 | #include <sys/param.h> |
5266a81e | 28 | #include <sys/ioctl.h> |
011feef8 PF |
29 | |
30 | #include "util.h" | |
31 | #include "list.h" | |
e5b04c8d | 32 | #include "refcnt.h" |
22fc2420 | 33 | #include "async.h" |
011feef8 PF |
34 | |
35 | #include "dhcp-protocol.h" | |
46a66b79 | 36 | #include "dhcp-internal.h" |
fe8db0c5 | 37 | #include "dhcp-lease-internal.h" |
011feef8 PF |
38 | #include "sd-dhcp-client.h" |
39 | ||
40 | struct sd_dhcp_client { | |
e5b04c8d PF |
41 | RefCount n_ref; |
42 | ||
011feef8 | 43 | DHCPState state; |
d3d8ac2f | 44 | sd_event *event; |
b25ef18b | 45 | int event_priority; |
d3d8ac2f | 46 | sd_event_source *timeout_resend; |
011feef8 | 47 | int index; |
8c00042c PF |
48 | int fd; |
49 | union sockaddr_union link; | |
50 | sd_event_source *receive_message; | |
f5de5b00 | 51 | bool request_broadcast; |
011feef8 | 52 | uint8_t *req_opts; |
7a7c74ca | 53 | size_t req_opts_allocated; |
011feef8 | 54 | size_t req_opts_size; |
3b349af6 | 55 | be32_t last_addr; |
715c6a9a PF |
56 | struct { |
57 | uint8_t type; | |
58 | struct ether_addr mac_addr; | |
59 | } _packed_ client_id; | |
4cc7a82c | 60 | char *hostname; |
edb85f0d | 61 | char *vendor_class_identifier; |
324f8187 | 62 | uint32_t mtu; |
46a66b79 | 63 | uint32_t xid; |
d3d8ac2f | 64 | usec_t start_time; |
40e39f62 | 65 | uint16_t secs; |
e2dfc79f | 66 | unsigned int attempt; |
51debc1e PF |
67 | usec_t request_sent; |
68 | sd_event_source *timeout_t1; | |
69 | sd_event_source *timeout_t2; | |
70 | sd_event_source *timeout_expire; | |
751246ee PF |
71 | sd_dhcp_client_cb_t cb; |
72 | void *userdata; | |
a6cc569e | 73 | sd_dhcp_lease *lease; |
011feef8 PF |
74 | }; |
75 | ||
76 | static const uint8_t default_req_opts[] = { | |
77 | DHCP_OPTION_SUBNET_MASK, | |
78 | DHCP_OPTION_ROUTER, | |
79 | DHCP_OPTION_HOST_NAME, | |
80 | DHCP_OPTION_DOMAIN_NAME, | |
81 | DHCP_OPTION_DOMAIN_NAME_SERVER, | |
82 | DHCP_OPTION_NTP_SERVER, | |
83 | }; | |
84 | ||
e5002702 TG |
85 | static int client_receive_message_raw(sd_event_source *s, int fd, |
86 | uint32_t revents, void *userdata); | |
87 | static int client_receive_message_udp(sd_event_source *s, int fd, | |
88 | uint32_t revents, void *userdata); | |
574cc928 | 89 | static void client_stop(sd_dhcp_client *client, int error); |
aba26854 | 90 | |
751246ee | 91 | int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb, |
5ee482df | 92 | void *userdata) { |
751246ee PF |
93 | assert_return(client, -EINVAL); |
94 | ||
95 | client->cb = cb; | |
96 | client->userdata = userdata; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
f5de5b00 TG |
101 | int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) { |
102 | assert_return(client, -EINVAL); | |
103 | ||
104 | client->request_broadcast = !!broadcast; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
5ee482df | 109 | int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) { |
011feef8 PF |
110 | size_t i; |
111 | ||
112 | assert_return(client, -EINVAL); | |
781ca7a1 PF |
113 | assert_return (IN_SET(client->state, DHCP_STATE_INIT, |
114 | DHCP_STATE_STOPPED), -EBUSY); | |
011feef8 PF |
115 | |
116 | switch(option) { | |
117 | case DHCP_OPTION_PAD: | |
118 | case DHCP_OPTION_OVERLOAD: | |
119 | case DHCP_OPTION_MESSAGE_TYPE: | |
120 | case DHCP_OPTION_PARAMETER_REQUEST_LIST: | |
121 | case DHCP_OPTION_END: | |
122 | return -EINVAL; | |
123 | ||
124 | default: | |
125 | break; | |
126 | } | |
127 | ||
128 | for (i = 0; i < client->req_opts_size; i++) | |
129 | if (client->req_opts[i] == option) | |
130 | return -EEXIST; | |
131 | ||
7a7c74ca | 132 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, |
011feef8 PF |
133 | client->req_opts_size + 1)) |
134 | return -ENOMEM; | |
135 | ||
7a7c74ca | 136 | client->req_opts[client->req_opts_size++] = option; |
011feef8 PF |
137 | |
138 | return 0; | |
139 | } | |
140 | ||
141 | int sd_dhcp_client_set_request_address(sd_dhcp_client *client, | |
5ee482df | 142 | const struct in_addr *last_addr) { |
011feef8 | 143 | assert_return(client, -EINVAL); |
781ca7a1 PF |
144 | assert_return (IN_SET(client->state, DHCP_STATE_INIT, |
145 | DHCP_STATE_STOPPED), -EBUSY); | |
011feef8 PF |
146 | |
147 | if (last_addr) | |
148 | client->last_addr = last_addr->s_addr; | |
149 | else | |
150 | client->last_addr = INADDR_ANY; | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
5ee482df | 155 | int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) { |
011feef8 | 156 | assert_return(client, -EINVAL); |
781ca7a1 PF |
157 | assert_return (IN_SET(client->state, DHCP_STATE_INIT, |
158 | DHCP_STATE_STOPPED), -EBUSY); | |
d9bf4f8c | 159 | assert_return(interface_index > 0, -EINVAL); |
011feef8 PF |
160 | |
161 | client->index = interface_index; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
46a66b79 | 166 | int sd_dhcp_client_set_mac(sd_dhcp_client *client, |
5ee482df | 167 | const struct ether_addr *addr) { |
574cc928 | 168 | DHCP_CLIENT_DONT_DESTROY(client); |
4644fee0 TG |
169 | bool need_restart = false; |
170 | ||
46a66b79 | 171 | assert_return(client, -EINVAL); |
4644fee0 | 172 | assert_return(addr, -EINVAL); |
46a66b79 | 173 | |
4644fee0 TG |
174 | if (memcmp(&client->client_id.mac_addr, addr, ETH_ALEN) == 0) |
175 | return 0; | |
176 | ||
781ca7a1 | 177 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { |
4644fee0 TG |
178 | log_dhcp_client(client, "Changing MAC address on running DHCP " |
179 | "client, restarting"); | |
4644fee0 | 180 | need_restart = true; |
574cc928 | 181 | client_stop(client, DHCP_EVENT_STOP); |
4644fee0 | 182 | } |
02ec5cd7 | 183 | |
715c6a9a PF |
184 | memcpy(&client->client_id.mac_addr, addr, ETH_ALEN); |
185 | client->client_id.type = 0x01; | |
46a66b79 | 186 | |
781ca7a1 | 187 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
4644fee0 TG |
188 | sd_dhcp_client_start(client); |
189 | ||
46a66b79 PF |
190 | return 0; |
191 | } | |
192 | ||
4cc7a82c EY |
193 | int sd_dhcp_client_set_hostname(sd_dhcp_client *client, |
194 | const char *hostname) { | |
195 | char *new_hostname = NULL; | |
196 | ||
197 | assert_return(client, -EINVAL); | |
198 | ||
199 | if (streq_ptr(client->hostname, hostname)) | |
200 | return 0; | |
201 | ||
202 | if (hostname) { | |
203 | new_hostname = strdup(hostname); | |
204 | if (!new_hostname) | |
205 | return -ENOMEM; | |
206 | } | |
207 | ||
208 | free(client->hostname); | |
209 | client->hostname = new_hostname; | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
edb85f0d SS |
214 | int sd_dhcp_client_set_vendor_class_identifier(sd_dhcp_client *client, |
215 | const char *vci) { | |
216 | char *new_vci = NULL; | |
217 | ||
218 | assert_return(client, -EINVAL); | |
219 | ||
220 | new_vci = strdup(vci); | |
221 | if (!new_vci) | |
222 | return -ENOMEM; | |
223 | ||
224 | free(client->vendor_class_identifier); | |
225 | ||
226 | client->vendor_class_identifier = new_vci; | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
324f8187 TG |
231 | int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) { |
232 | assert_return(client, -EINVAL); | |
233 | assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE); | |
234 | ||
235 | client->mtu = mtu; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
a6cc569e | 240 | int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) { |
751246ee | 241 | assert_return(client, -EINVAL); |
a6cc569e | 242 | assert_return(ret, -EINVAL); |
751246ee | 243 | |
a6cc569e TG |
244 | if (client->state != DHCP_STATE_BOUND && |
245 | client->state != DHCP_STATE_RENEWING && | |
246 | client->state != DHCP_STATE_REBINDING) | |
247 | return -EADDRNOTAVAIL; | |
751246ee | 248 | |
a6cc569e | 249 | *ret = sd_dhcp_lease_ref(client->lease); |
4f882b2a TG |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
574cc928 TG |
254 | static void client_notify(sd_dhcp_client *client, int event) { |
255 | if (client->cb) | |
751246ee | 256 | client->cb(client, event, client->userdata); |
3e3d8f78 PF |
257 | } |
258 | ||
0f941add | 259 | static int client_initialize(sd_dhcp_client *client) { |
bbdf06d9 | 260 | assert_return(client, -EINVAL); |
bbdf06d9 | 261 | |
8c00042c PF |
262 | client->receive_message = |
263 | sd_event_source_unref(client->receive_message); | |
264 | ||
22fc2420 | 265 | client->fd = asynchronous_close(client->fd); |
8c00042c | 266 | |
d3d8ac2f PF |
267 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
268 | ||
51debc1e PF |
269 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); |
270 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
271 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
272 | ||
e2dfc79f PF |
273 | client->attempt = 1; |
274 | ||
f8fdefe4 | 275 | client->state = DHCP_STATE_INIT; |
0f941add | 276 | client->xid = 0; |
bbdf06d9 | 277 | |
a6cc569e TG |
278 | if (client->lease) |
279 | client->lease = sd_dhcp_lease_unref(client->lease); | |
8c00042c | 280 | |
0f941add PF |
281 | return 0; |
282 | } | |
283 | ||
574cc928 TG |
284 | static void client_stop(sd_dhcp_client *client, int error) { |
285 | assert(client); | |
0f941add | 286 | |
ccfdc9a1 UTL |
287 | if (error < 0) |
288 | log_dhcp_client(client, "STOPPED: %s", strerror(-error)); | |
2d2349cc TG |
289 | else if (error == DHCP_EVENT_STOP) |
290 | log_dhcp_client(client, "STOPPED"); | |
291 | else | |
292 | log_dhcp_client(client, "STOPPED: Unknown event"); | |
0f941add | 293 | |
574cc928 | 294 | client_notify(client, error); |
ee57a737 | 295 | |
574cc928 | 296 | client_initialize(client); |
bbdf06d9 PF |
297 | } |
298 | ||
424a8732 TG |
299 | static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret, |
300 | uint8_t type, size_t *_optlen, size_t *_optoffset) { | |
301 | _cleanup_free_ DHCPPacket *packet; | |
302 | size_t optlen, optoffset, size; | |
8a9e7616 | 303 | be16_t max_size; |
cf597f65 | 304 | int r; |
46a66b79 | 305 | |
6236f49b TG |
306 | assert(client); |
307 | assert(client->secs); | |
424a8732 TG |
308 | assert(ret); |
309 | assert(_optlen); | |
310 | assert(_optoffset); | |
8a9e7616 | 311 | assert(type == DHCP_DISCOVER || type == DHCP_REQUEST); |
0a1b6da8 | 312 | |
424a8732 TG |
313 | optlen = DHCP_MIN_OPTIONS_SIZE; |
314 | size = sizeof(DHCPPacket) + optlen; | |
315 | ||
316 | packet = malloc0(size); | |
317 | if (!packet) | |
318 | return -ENOMEM; | |
319 | ||
320 | r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type, | |
321 | optlen, &optoffset); | |
cf597f65 TG |
322 | if (r < 0) |
323 | return r; | |
46a66b79 | 324 | |
0a1b6da8 TG |
325 | /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers |
326 | refuse to issue an DHCP lease if 'secs' is set to zero */ | |
424a8732 | 327 | packet->dhcp.secs = htobe16(client->secs); |
0a1b6da8 | 328 | |
63a07041 CA |
329 | /* RFC2132 section 4.1 |
330 | A client that cannot receive unicast IP datagrams until its protocol | |
331 | software has been configured with an IP address SHOULD set the | |
332 | BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or | |
333 | DHCPREQUEST messages that client sends. The BROADCAST bit will | |
334 | provide a hint to the DHCP server and BOOTP relay agent to broadcast | |
f5de5b00 TG |
335 | any messages to the client on the client's subnet. |
336 | ||
337 | Note: some interfaces needs this to be enabled, but some networks | |
338 | needs this to be disabled as broadcasts are filteretd, so this | |
339 | needs to be configurable */ | |
340 | if (client->request_broadcast) | |
341 | packet->dhcp.flags = htobe16(0x8000); | |
63a07041 | 342 | |
50d6810e TG |
343 | /* RFC2132 section 4.1.1: |
344 | The client MUST include its hardware address in the ’chaddr’ field, if | |
345 | necessary for delivery of DHCP reply messages. | |
346 | */ | |
424a8732 | 347 | memcpy(&packet->dhcp.chaddr, &client->client_id.mac_addr, ETH_ALEN); |
f5a70de7 | 348 | |
ee57a737 | 349 | /* Some DHCP servers will refuse to issue an DHCP lease if the Client |
46a66b79 | 350 | Identifier option is not set */ |
424a8732 | 351 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, |
20b958bf | 352 | DHCP_OPTION_CLIENT_IDENTIFIER, |
715c6a9a | 353 | sizeof(client->client_id), &client->client_id); |
cf597f65 TG |
354 | if (r < 0) |
355 | return r; | |
46a66b79 | 356 | |
50d6810e TG |
357 | |
358 | /* RFC2131 section 3.5: | |
359 | in its initial DHCPDISCOVER or DHCPREQUEST message, a | |
360 | client may provide the server with a list of specific | |
361 | parameters the client is interested in. If the client | |
362 | includes a list of parameters in a DHCPDISCOVER message, | |
363 | it MUST include that list in any subsequent DHCPREQUEST | |
364 | messages. | |
365 | */ | |
424a8732 | 366 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, |
8a9e7616 | 367 | DHCP_OPTION_PARAMETER_REQUEST_LIST, |
20b958bf | 368 | client->req_opts_size, client->req_opts); |
8a9e7616 TG |
369 | if (r < 0) |
370 | return r; | |
371 | ||
50d6810e TG |
372 | /* RFC2131 section 3.5: |
373 | The client SHOULD include the ’maximum DHCP message size’ option to | |
374 | let the server know how large the server may make its DHCP messages. | |
375 | ||
376 | Note (from ConnMan): Some DHCP servers will send bigger DHCP packets | |
377 | than the defined default size unless the Maximum Messge Size option | |
378 | is explicitely set | |
324f8187 TG |
379 | |
380 | RFC3442 "Requirements to Avoid Sizing Constraints": | |
381 | Because a full routing table can be quite large, the standard 576 | |
382 | octet maximum size for a DHCP message may be too short to contain | |
383 | some legitimate Classless Static Route options. Because of this, | |
384 | clients implementing the Classless Static Route option SHOULD send a | |
385 | Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP | |
386 | stack is capable of receiving larger IP datagrams. In this case, the | |
387 | client SHOULD set the value of this option to at least the MTU of the | |
388 | interface that the client is configuring. The client MAY set the | |
389 | value of this option higher, up to the size of the largest UDP packet | |
390 | it is prepared to accept. (Note that the value specified in the | |
391 | Maximum DHCP Message Size option is the total maximum packet size, | |
392 | including IP and UDP headers.) | |
50d6810e | 393 | */ |
424a8732 | 394 | max_size = htobe16(size); |
324f8187 | 395 | r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0, |
8a9e7616 TG |
396 | DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, |
397 | 2, &max_size); | |
398 | if (r < 0) | |
399 | return r; | |
46a66b79 | 400 | |
424a8732 TG |
401 | *_optlen = optlen; |
402 | *_optoffset = optoffset; | |
403 | *ret = packet; | |
404 | packet = NULL; | |
405 | ||
46a66b79 PF |
406 | return 0; |
407 | } | |
408 | ||
63edaa62 TG |
409 | static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet, |
410 | size_t len) { | |
411 | dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT, | |
412 | INADDR_BROADCAST, DHCP_PORT_SERVER, len); | |
413 | ||
414 | return dhcp_network_send_raw_socket(client->fd, &client->link, | |
415 | packet, len); | |
416 | } | |
417 | ||
6236f49b | 418 | static int client_send_discover(sd_dhcp_client *client) { |
9f2a50a3 | 419 | _cleanup_free_ DHCPPacket *discover = NULL; |
424a8732 | 420 | size_t optoffset, optlen; |
6236f49b TG |
421 | usec_t time_now; |
422 | int r; | |
423 | ||
424 | assert(client); | |
50d6810e TG |
425 | assert(client->state == DHCP_STATE_INIT || |
426 | client->state == DHCP_STATE_SELECTING); | |
427 | ||
428 | /* See RFC2131 section 4.4.1 */ | |
6236f49b | 429 | |
fa94c34b | 430 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
6236f49b TG |
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 | client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1; | |
46a66b79 | 438 | |
424a8732 TG |
439 | r = client_message_init(client, &discover, DHCP_DISCOVER, |
440 | &optlen, &optoffset); | |
6236f49b TG |
441 | if (r < 0) |
442 | return r; | |
46a66b79 | 443 | |
50d6810e TG |
444 | /* the client may suggest values for the network address |
445 | and lease time in the DHCPDISCOVER message. The client may include | |
446 | the ’requested IP address’ option to suggest that a particular IP | |
447 | address be assigned, and may include the ’IP address lease time’ | |
448 | option to suggest the lease time it would like. | |
449 | */ | |
46a66b79 | 450 | if (client->last_addr != INADDR_ANY) { |
04b28be1 | 451 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
20b958bf TG |
452 | DHCP_OPTION_REQUESTED_IP_ADDRESS, |
453 | 4, &client->last_addr); | |
6236f49b TG |
454 | if (r < 0) |
455 | return r; | |
46a66b79 PF |
456 | } |
457 | ||
4cc7a82c EY |
458 | /* it is unclear from RFC 2131 if client should send hostname in |
459 | DHCPDISCOVER but dhclient does and so we do as well | |
460 | */ | |
461 | if (client->hostname) { | |
462 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
463 | DHCP_OPTION_HOST_NAME, | |
464 | strlen(client->hostname), client->hostname); | |
465 | if (r < 0) | |
466 | return r; | |
467 | } | |
468 | ||
edb85f0d SS |
469 | if (client->vendor_class_identifier) { |
470 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
471 | DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, | |
472 | strlen(client->vendor_class_identifier), | |
473 | client->vendor_class_identifier); | |
474 | if (r < 0) | |
475 | return r; | |
476 | } | |
477 | ||
04b28be1 | 478 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
20b958bf | 479 | DHCP_OPTION_END, 0, NULL); |
f7926298 TA |
480 | if (r < 0) |
481 | return r; | |
46a66b79 | 482 | |
50d6810e TG |
483 | /* We currently ignore: |
484 | The client SHOULD wait a random time between one and ten seconds to | |
485 | desynchronize the use of DHCP at startup. | |
486 | */ | |
20b958bf | 487 | r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset); |
6236f49b TG |
488 | if (r < 0) |
489 | return r; | |
e2dfc79f | 490 | |
ee57a737 TG |
491 | log_dhcp_client(client, "DISCOVER"); |
492 | ||
63edaa62 | 493 | return 0; |
e2dfc79f PF |
494 | } |
495 | ||
6236f49b | 496 | static int client_send_request(sd_dhcp_client *client) { |
8186d9dd | 497 | _cleanup_free_ DHCPPacket *request = NULL; |
424a8732 | 498 | size_t optoffset, optlen; |
6236f49b | 499 | int r; |
e2dfc79f | 500 | |
424a8732 TG |
501 | r = client_message_init(client, &request, DHCP_REQUEST, |
502 | &optlen, &optoffset); | |
6236f49b TG |
503 | if (r < 0) |
504 | return r; | |
46a66b79 | 505 | |
8b1243f7 | 506 | switch (client->state) { |
50d6810e TG |
507 | /* See RFC2131 section 4.3.2 (note that there is a typo in the RFC, |
508 | SELECTING should be REQUESTING) | |
509 | */ | |
510 | ||
511 | case DHCP_STATE_REQUESTING: | |
512 | /* Client inserts the address of the selected server in ’server | |
513 | identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be | |
514 | filled in with the yiaddr value from the chosen DHCPOFFER. | |
515 | */ | |
8b1243f7 | 516 | |
04b28be1 | 517 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
50d6810e TG |
518 | DHCP_OPTION_SERVER_IDENTIFIER, |
519 | 4, &client->lease->server_address); | |
6236f49b TG |
520 | if (r < 0) |
521 | return r; | |
8b1243f7 | 522 | |
04b28be1 | 523 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
6236f49b TG |
524 | DHCP_OPTION_REQUESTED_IP_ADDRESS, |
525 | 4, &client->lease->address); | |
526 | if (r < 0) | |
527 | return r; | |
528 | ||
50d6810e TG |
529 | break; |
530 | ||
531 | case DHCP_STATE_INIT_REBOOT: | |
532 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ | |
533 | option MUST be filled in with client’s notion of its previously | |
534 | assigned address. ’ciaddr’ MUST be zero. | |
535 | */ | |
04b28be1 | 536 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
50d6810e TG |
537 | DHCP_OPTION_REQUESTED_IP_ADDRESS, |
538 | 4, &client->last_addr); | |
6236f49b TG |
539 | if (r < 0) |
540 | return r; | |
8b1243f7 PF |
541 | break; |
542 | ||
8b1243f7 | 543 | case DHCP_STATE_RENEWING: |
50d6810e TG |
544 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
545 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
546 | client’s IP address. | |
547 | */ | |
548 | ||
549 | /* fall through */ | |
8b1243f7 | 550 | case DHCP_STATE_REBINDING: |
50d6810e TG |
551 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
552 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
553 | client’s IP address. | |
554 | ||
555 | This message MUST be broadcast to the 0xffffffff IP broadcast address. | |
556 | */ | |
557 | request->dhcp.ciaddr = client->lease->address; | |
8b1243f7 PF |
558 | |
559 | break; | |
781ca7a1 | 560 | |
50d6810e TG |
561 | case DHCP_STATE_INIT: |
562 | case DHCP_STATE_SELECTING: | |
563 | case DHCP_STATE_REBOOTING: | |
564 | case DHCP_STATE_BOUND: | |
781ca7a1 PF |
565 | case DHCP_STATE_STOPPED: |
566 | return -EINVAL; | |
e2dfc79f | 567 | } |
46a66b79 | 568 | |
4cc7a82c EY |
569 | if (client->hostname) { |
570 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, | |
571 | DHCP_OPTION_HOST_NAME, | |
572 | strlen(client->hostname), client->hostname); | |
573 | if (r < 0) | |
574 | return r; | |
575 | } | |
576 | ||
04b28be1 | 577 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
20b958bf | 578 | DHCP_OPTION_END, 0, NULL); |
6236f49b TG |
579 | if (r < 0) |
580 | return r; | |
46a66b79 | 581 | |
aba26854 | 582 | if (client->state == DHCP_STATE_RENEWING) { |
6236f49b TG |
583 | r = dhcp_network_send_udp_socket(client->fd, |
584 | client->lease->server_address, | |
585 | DHCP_PORT_SERVER, | |
586 | &request->dhcp, | |
20b958bf | 587 | sizeof(DHCPMessage) + optoffset); |
aba26854 | 588 | } else { |
20b958bf | 589 | r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset); |
aba26854 | 590 | } |
6236f49b TG |
591 | if (r < 0) |
592 | return r; | |
46a66b79 | 593 | |
998d8047 TG |
594 | switch (client->state) { |
595 | case DHCP_STATE_REQUESTING: | |
596 | log_dhcp_client(client, "REQUEST (requesting)"); | |
597 | break; | |
598 | case DHCP_STATE_INIT_REBOOT: | |
599 | log_dhcp_client(client, "REQUEST (init-reboot)"); | |
600 | break; | |
601 | case DHCP_STATE_RENEWING: | |
602 | log_dhcp_client(client, "REQUEST (renewing)"); | |
603 | break; | |
604 | case DHCP_STATE_REBINDING: | |
605 | log_dhcp_client(client, "REQUEST (rebinding)"); | |
606 | break; | |
607 | default: | |
608 | log_dhcp_client(client, "REQUEST (invalid)"); | |
609 | break; | |
610 | } | |
ee57a737 | 611 | |
63edaa62 | 612 | return 0; |
46a66b79 PF |
613 | } |
614 | ||
7739a40b TG |
615 | static int client_start(sd_dhcp_client *client); |
616 | ||
d3d8ac2f | 617 | static int client_timeout_resend(sd_event_source *s, uint64_t usec, |
5ee482df | 618 | void *userdata) { |
d3d8ac2f | 619 | sd_dhcp_client *client = userdata; |
574cc928 | 620 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 | 621 | usec_t next_timeout = 0; |
d23c45bf | 622 | uint64_t time_now; |
aba26854 | 623 | uint32_t time_left; |
d23c45bf | 624 | int r; |
b25ef18b TG |
625 | |
626 | assert(s); | |
627 | assert(client); | |
628 | assert(client->event); | |
d3d8ac2f | 629 | |
fa94c34b | 630 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d23c45bf TG |
631 | if (r < 0) |
632 | goto error; | |
633 | ||
aba26854 PF |
634 | switch (client->state) { |
635 | case DHCP_STATE_RENEWING: | |
636 | ||
e5002702 | 637 | time_left = (client->lease->t2 - client->lease->t1) / 2; |
aba26854 PF |
638 | if (time_left < 60) |
639 | time_left = 60; | |
d3d8ac2f | 640 | |
d23c45bf | 641 | next_timeout = time_now + time_left * USEC_PER_SEC; |
d3d8ac2f | 642 | |
aba26854 PF |
643 | break; |
644 | ||
3dd71400 PF |
645 | case DHCP_STATE_REBINDING: |
646 | ||
e5002702 | 647 | time_left = (client->lease->lifetime - client->lease->t2) / 2; |
3dd71400 PF |
648 | if (time_left < 60) |
649 | time_left = 60; | |
650 | ||
d23c45bf | 651 | next_timeout = time_now + time_left * USEC_PER_SEC; |
3dd71400 PF |
652 | break; |
653 | ||
8b1243f7 PF |
654 | case DHCP_STATE_REBOOTING: |
655 | /* start over as we did not receive a timely ack or nak */ | |
7739a40b | 656 | r = client_initialize(client); |
eb105b96 TG |
657 | if (r < 0) |
658 | goto error; | |
8b1243f7 | 659 | |
998d8047 TG |
660 | r = client_start(client); |
661 | if (r < 0) | |
662 | goto error; | |
663 | else { | |
664 | log_dhcp_client(client, "REBOOTED"); | |
665 | return 0; | |
666 | } | |
7739a40b | 667 | |
aba26854 PF |
668 | case DHCP_STATE_INIT: |
669 | case DHCP_STATE_INIT_REBOOT: | |
aba26854 PF |
670 | case DHCP_STATE_SELECTING: |
671 | case DHCP_STATE_REQUESTING: | |
672 | case DHCP_STATE_BOUND: | |
aba26854 PF |
673 | |
674 | if (client->attempt < 64) | |
675 | client->attempt *= 2; | |
676 | ||
d23c45bf | 677 | next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC; |
aba26854 PF |
678 | |
679 | break; | |
781ca7a1 PF |
680 | |
681 | case DHCP_STATE_STOPPED: | |
682 | r = -EINVAL; | |
683 | goto error; | |
aba26854 PF |
684 | } |
685 | ||
9bf3b535 | 686 | next_timeout += (random_u32() & 0x1fffff); |
d3d8ac2f | 687 | |
2333154a UTL |
688 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
689 | ||
6a0f1f6d LP |
690 | r = sd_event_add_time(client->event, |
691 | &client->timeout_resend, | |
fa94c34b | 692 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
693 | next_timeout, 10 * USEC_PER_MSEC, |
694 | client_timeout_resend, client); | |
b25ef18b TG |
695 | if (r < 0) |
696 | goto error; | |
697 | ||
e5002702 TG |
698 | r = sd_event_source_set_priority(client->timeout_resend, |
699 | client->event_priority); | |
b25ef18b | 700 | if (r < 0) |
e2dfc79f | 701 | goto error; |
d3d8ac2f | 702 | |
9021bb9f TG |
703 | r = sd_event_source_set_name(client->timeout_resend, |
704 | "dhcp4-resend-timer"); | |
705 | if (r < 0) | |
706 | goto error; | |
707 | ||
e2dfc79f PF |
708 | switch (client->state) { |
709 | case DHCP_STATE_INIT: | |
6236f49b | 710 | r = client_send_discover(client); |
b25ef18b | 711 | if (r >= 0) { |
e2dfc79f PF |
712 | client->state = DHCP_STATE_SELECTING; |
713 | client->attempt = 1; | |
714 | } else { | |
715 | if (client->attempt >= 64) | |
716 | goto error; | |
717 | } | |
718 | ||
719 | break; | |
720 | ||
721 | case DHCP_STATE_SELECTING: | |
6236f49b | 722 | r = client_send_discover(client); |
b25ef18b | 723 | if (r < 0 && client->attempt >= 64) |
d3d8ac2f PF |
724 | goto error; |
725 | ||
e2dfc79f PF |
726 | break; |
727 | ||
8b1243f7 | 728 | case DHCP_STATE_INIT_REBOOT: |
e2dfc79f | 729 | case DHCP_STATE_REQUESTING: |
aba26854 | 730 | case DHCP_STATE_RENEWING: |
3dd71400 | 731 | case DHCP_STATE_REBINDING: |
6236f49b | 732 | r = client_send_request(client); |
b25ef18b | 733 | if (r < 0 && client->attempt >= 64) |
e2dfc79f | 734 | goto error; |
d3d8ac2f | 735 | |
8b1243f7 PF |
736 | if (client->state == DHCP_STATE_INIT_REBOOT) |
737 | client->state = DHCP_STATE_REBOOTING; | |
738 | ||
d23c45bf | 739 | client->request_sent = time_now; |
51debc1e | 740 | |
d3d8ac2f PF |
741 | break; |
742 | ||
d3d8ac2f | 743 | case DHCP_STATE_REBOOTING: |
d3d8ac2f | 744 | case DHCP_STATE_BOUND: |
d3d8ac2f PF |
745 | |
746 | break; | |
781ca7a1 PF |
747 | |
748 | case DHCP_STATE_STOPPED: | |
749 | r = -EINVAL; | |
750 | goto error; | |
d3d8ac2f PF |
751 | } |
752 | ||
753 | return 0; | |
754 | ||
755 | error: | |
b25ef18b | 756 | client_stop(client, r); |
d3d8ac2f PF |
757 | |
758 | /* Errors were dealt with when stopping the client, don't spill | |
759 | errors into the event loop handler */ | |
760 | return 0; | |
761 | } | |
762 | ||
0af03ba5 TG |
763 | static int client_initialize_io_events(sd_dhcp_client *client, |
764 | sd_event_io_handler_t io_callback) { | |
6a1cd41e PF |
765 | int r; |
766 | ||
b25ef18b TG |
767 | assert(client); |
768 | assert(client->event); | |
769 | ||
151b9b96 LP |
770 | r = sd_event_add_io(client->event, &client->receive_message, |
771 | client->fd, EPOLLIN, io_callback, | |
772 | client); | |
6a1cd41e PF |
773 | if (r < 0) |
774 | goto error; | |
775 | ||
e5002702 TG |
776 | r = sd_event_source_set_priority(client->receive_message, |
777 | client->event_priority); | |
b25ef18b TG |
778 | if (r < 0) |
779 | goto error; | |
780 | ||
9021bb9f TG |
781 | r = sd_event_source_set_name(client->receive_message, |
782 | "dhcp4-receive-message"); | |
783 | if (r < 0) | |
784 | goto error; | |
785 | ||
0af03ba5 TG |
786 | error: |
787 | if (r < 0) | |
788 | client_stop(client, r); | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
793 | static int client_initialize_time_events(sd_dhcp_client *client) { | |
794 | int r; | |
795 | ||
796 | assert(client); | |
797 | assert(client->event); | |
798 | ||
2333154a UTL |
799 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
800 | ||
6a0f1f6d LP |
801 | r = sd_event_add_time(client->event, |
802 | &client->timeout_resend, | |
fa94c34b | 803 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
804 | 0, 0, |
805 | client_timeout_resend, client); | |
b25ef18b TG |
806 | if (r < 0) |
807 | goto error; | |
808 | ||
e5002702 TG |
809 | r = sd_event_source_set_priority(client->timeout_resend, |
810 | client->event_priority); | |
6a1cd41e | 811 | |
9021bb9f TG |
812 | r = sd_event_source_set_name(client->timeout_resend, |
813 | "dhcp4-resend-timer"); | |
814 | if (r < 0) | |
815 | goto error; | |
816 | ||
6a1cd41e PF |
817 | error: |
818 | if (r < 0) | |
819 | client_stop(client, r); | |
820 | ||
821 | return 0; | |
822 | ||
823 | } | |
824 | ||
0af03ba5 TG |
825 | static int client_initialize_events(sd_dhcp_client *client, |
826 | sd_event_io_handler_t io_callback) { | |
827 | client_initialize_io_events(client, io_callback); | |
828 | client_initialize_time_events(client); | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
0f941add PF |
833 | static int client_start(sd_dhcp_client *client) { |
834 | int r; | |
835 | ||
836 | assert_return(client, -EINVAL); | |
837 | assert_return(client->event, -EINVAL); | |
838 | assert_return(client->index > 0, -EINVAL); | |
839 | assert_return(client->fd < 0, -EBUSY); | |
840 | assert_return(client->xid == 0, -EINVAL); | |
841 | assert_return(client->state == DHCP_STATE_INIT || | |
842 | client->state == DHCP_STATE_INIT_REBOOT, -EBUSY); | |
843 | ||
844 | client->xid = random_u32(); | |
845 | ||
58587a7a | 846 | r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid, client->client_id.mac_addr); |
0f941add PF |
847 | if (r < 0) { |
848 | client_stop(client, r); | |
849 | return r; | |
850 | } | |
0f941add | 851 | client->fd = r; |
58ec2d3e TG |
852 | |
853 | if (client->state == DHCP_STATE_INIT) { | |
fa94c34b | 854 | client->start_time = now(clock_boottime_or_monotonic()); |
58ec2d3e TG |
855 | client->secs = 0; |
856 | } | |
0f941add | 857 | |
0f941add PF |
858 | return client_initialize_events(client, client_receive_message_raw); |
859 | } | |
860 | ||
51debc1e | 861 | static int client_timeout_expire(sd_event_source *s, uint64_t usec, |
5ee482df | 862 | void *userdata) { |
751246ee | 863 | sd_dhcp_client *client = userdata; |
574cc928 | 864 | DHCP_CLIENT_DONT_DESTROY(client); |
751246ee | 865 | |
ee57a737 TG |
866 | log_dhcp_client(client, "EXPIRED"); |
867 | ||
574cc928 | 868 | client_notify(client, DHCP_EVENT_EXPIRED); |
0f941add | 869 | |
781ca7a1 | 870 | /* lease was lost, start over if not freed or stopped in callback */ |
574cc928 | 871 | if (client->state != DHCP_STATE_STOPPED) { |
e5b04c8d PF |
872 | client_initialize(client); |
873 | client_start(client); | |
874 | } | |
751246ee | 875 | |
51debc1e PF |
876 | return 0; |
877 | } | |
878 | ||
5ee482df | 879 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
3dd71400 | 880 | sd_dhcp_client *client = userdata; |
574cc928 | 881 | DHCP_CLIENT_DONT_DESTROY(client); |
3dd71400 PF |
882 | int r; |
883 | ||
03e334a1 | 884 | client->receive_message = sd_event_source_unref(client->receive_message); |
22fc2420 | 885 | client->fd = asynchronous_close(client->fd); |
3dd71400 PF |
886 | |
887 | client->state = DHCP_STATE_REBINDING; | |
888 | client->attempt = 1; | |
889 | ||
58587a7a | 890 | r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid, client->client_id.mac_addr); |
3dd71400 PF |
891 | if (r < 0) { |
892 | client_stop(client, r); | |
893 | return 0; | |
894 | } | |
3dd71400 PF |
895 | client->fd = r; |
896 | ||
d23c45bf | 897 | return client_initialize_events(client, client_receive_message_raw); |
51debc1e PF |
898 | } |
899 | ||
e5002702 TG |
900 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, |
901 | void *userdata) { | |
aba26854 | 902 | sd_dhcp_client *client = userdata; |
574cc928 | 903 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 PF |
904 | |
905 | client->state = DHCP_STATE_RENEWING; | |
906 | client->attempt = 1; | |
907 | ||
0af03ba5 | 908 | return client_initialize_time_events(client); |
51debc1e PF |
909 | } |
910 | ||
e5002702 TG |
911 | static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, |
912 | size_t len) { | |
a6cc569e | 913 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; |
5ee482df | 914 | int r; |
3e3d8f78 | 915 | |
a6cc569e TG |
916 | r = dhcp_lease_new(&lease); |
917 | if (r < 0) | |
918 | return r; | |
8c00042c | 919 | |
e5002702 | 920 | r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease); |
9e64dd72 TG |
921 | if (r != DHCP_OFFER) { |
922 | log_dhcp_client(client, "receieved message was not an OFFER, ignoring"); | |
5ee482df | 923 | return -ENOMSG; |
9e64dd72 | 924 | } |
8c00042c | 925 | |
8e34a618 TG |
926 | lease->next_server = offer->siaddr; |
927 | ||
e5002702 | 928 | lease->address = offer->yiaddr; |
8c00042c PF |
929 | |
930 | if (lease->address == INADDR_ANY || | |
931 | lease->server_address == INADDR_ANY || | |
9e64dd72 TG |
932 | lease->lifetime == 0) { |
933 | log_dhcp_client(client, "receieved lease lacks address, server " | |
934 | "address or lease lifetime, ignoring"); | |
5ee482df | 935 | return -ENOMSG; |
9e64dd72 TG |
936 | } |
937 | ||
938 | if (lease->subnet_mask == INADDR_ANY) { | |
939 | r = dhcp_lease_set_default_subnet_mask(lease); | |
940 | if (r < 0) { | |
941 | log_dhcp_client(client, "receieved lease lacks subnet " | |
942 | "mask, and a fallback one can not be " | |
943 | "generated, ignoring"); | |
944 | return -ENOMSG; | |
945 | } | |
946 | } | |
8c00042c | 947 | |
6e00a806 | 948 | sd_dhcp_lease_unref(client->lease); |
8c00042c | 949 | client->lease = lease; |
5ee482df | 950 | lease = NULL; |
8c00042c | 951 | |
ee57a737 TG |
952 | log_dhcp_client(client, "OFFER"); |
953 | ||
8c00042c | 954 | return 0; |
8c00042c PF |
955 | } |
956 | ||
615c1467 TG |
957 | static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force, |
958 | size_t len) { | |
959 | int r; | |
960 | ||
961 | r = dhcp_option_parse(force, len, NULL, NULL); | |
962 | if (r != DHCP_FORCERENEW) | |
963 | return -ENOMSG; | |
964 | ||
965 | log_dhcp_client(client, "FORCERENEW"); | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
e5002702 TG |
970 | static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, |
971 | size_t len) { | |
a6cc569e | 972 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; |
5ee482df | 973 | int r; |
3e3d8f78 | 974 | |
a6cc569e TG |
975 | r = dhcp_lease_new(&lease); |
976 | if (r < 0) | |
977 | return r; | |
3e3d8f78 | 978 | |
e5002702 | 979 | r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease); |
ee57a737 TG |
980 | if (r == DHCP_NAK) { |
981 | log_dhcp_client(client, "NAK"); | |
2d2349cc | 982 | return -EADDRNOTAVAIL; |
ee57a737 | 983 | } |
3e3d8f78 | 984 | |
9e64dd72 TG |
985 | if (r != DHCP_ACK) { |
986 | log_dhcp_client(client, "receieved message was not an ACK, ignoring"); | |
5ee482df | 987 | return -ENOMSG; |
9e64dd72 | 988 | } |
3e3d8f78 | 989 | |
8e34a618 TG |
990 | lease->next_server = ack->siaddr; |
991 | ||
e5002702 | 992 | lease->address = ack->yiaddr; |
3e3d8f78 PF |
993 | |
994 | if (lease->address == INADDR_ANY || | |
995 | lease->server_address == INADDR_ANY || | |
9e64dd72 TG |
996 | lease->lifetime == 0) { |
997 | log_dhcp_client(client, "receieved lease lacks address, server " | |
998 | "address or lease lifetime, ignoring"); | |
5ee482df | 999 | return -ENOMSG; |
9e64dd72 TG |
1000 | } |
1001 | ||
1002 | if (lease->subnet_mask == INADDR_ANY) { | |
1003 | r = dhcp_lease_set_default_subnet_mask(lease); | |
1004 | if (r < 0) { | |
1005 | log_dhcp_client(client, "receieved lease lacks subnet " | |
1006 | "mask, and a fallback one can not be " | |
1007 | "generated, ignoring"); | |
1008 | return -ENOMSG; | |
1009 | } | |
1010 | } | |
3e3d8f78 PF |
1011 | |
1012 | r = DHCP_EVENT_IP_ACQUIRE; | |
1013 | if (client->lease) { | |
1014 | if (client->lease->address != lease->address || | |
1015 | client->lease->subnet_mask != lease->subnet_mask || | |
1016 | client->lease->router != lease->router) { | |
1017 | r = DHCP_EVENT_IP_CHANGE; | |
68ceb9df PF |
1018 | } else |
1019 | r = DHCP_EVENT_RENEW; | |
3e3d8f78 | 1020 | |
a6cc569e | 1021 | client->lease = sd_dhcp_lease_unref(client->lease); |
3e3d8f78 PF |
1022 | } |
1023 | ||
1024 | client->lease = lease; | |
5ee482df | 1025 | lease = NULL; |
3e3d8f78 | 1026 | |
ee57a737 TG |
1027 | log_dhcp_client(client, "ACK"); |
1028 | ||
3e3d8f78 PF |
1029 | return r; |
1030 | } | |
1031 | ||
022446ad TG |
1032 | static uint64_t client_compute_timeout(sd_dhcp_client *client, |
1033 | uint32_t lifetime, double factor) { | |
1034 | assert(client); | |
1035 | assert(client->request_sent); | |
1036 | assert(lifetime); | |
1037 | ||
1038 | return client->request_sent + ((lifetime - 3) * USEC_PER_SEC * factor) + | |
9bf3b535 | 1039 | + (random_u32() & 0x1fffff); |
51debc1e PF |
1040 | } |
1041 | ||
022446ad TG |
1042 | static int client_set_lease_timeouts(sd_dhcp_client *client) { |
1043 | usec_t time_now; | |
1044 | uint64_t lifetime_timeout; | |
1045 | uint64_t t2_timeout; | |
1046 | uint64_t t1_timeout; | |
1047 | char time_string[FORMAT_TIMESPAN_MAX]; | |
5ee482df | 1048 | int r; |
51debc1e | 1049 | |
b25ef18b TG |
1050 | assert(client); |
1051 | assert(client->event); | |
022446ad TG |
1052 | assert(client->lease); |
1053 | assert(client->lease->lifetime); | |
51debc1e | 1054 | |
aba26854 PF |
1055 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); |
1056 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
1057 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
1058 | ||
022446ad TG |
1059 | /* don't set timers for infinite leases */ |
1060 | if (client->lease->lifetime == 0xffffffff) | |
1061 | return 0; | |
51debc1e | 1062 | |
fa94c34b | 1063 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
022446ad TG |
1064 | if (r < 0) |
1065 | return r; | |
1066 | assert(client->request_sent <= time_now); | |
1067 | ||
1068 | /* convert the various timeouts from relative (secs) to absolute (usecs) */ | |
1069 | lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1); | |
1070 | if (client->lease->t1 && client->lease->t2) { | |
1071 | /* both T1 and T2 are given */ | |
1072 | if (client->lease->t1 < client->lease->t2 && | |
1073 | client->lease->t2 < client->lease->lifetime) { | |
1074 | /* they are both valid */ | |
1075 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1076 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1077 | } else { | |
1078 | /* discard both */ | |
1079 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1080 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1081 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1082 | client->lease->t1 = client->lease->lifetime / 2; | |
1083 | } | |
1084 | } else if (client->lease->t2 && client->lease->t2 < client->lease->lifetime) { | |
1085 | /* only T2 is given, and it is valid */ | |
1086 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1087 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1088 | client->lease->t1 = client->lease->lifetime / 2; | |
1089 | if (t2_timeout <= t1_timeout) { | |
1090 | /* the computed T1 would be invalid, so discard T2 */ | |
1091 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1092 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1093 | } | |
1094 | } else if (client->lease->t1 && client->lease->t1 < client->lease->lifetime) { | |
1095 | /* only T1 is given, and it is valid */ | |
1096 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1097 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1098 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1099 | if (t2_timeout <= t1_timeout) { | |
1100 | /* the computed T2 would be invalid, so discard T1 */ | |
1101 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1102 | client->lease->t2 = client->lease->lifetime / 2; | |
1103 | } | |
1104 | } else { | |
1105 | /* fall back to the default timeouts */ | |
1106 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1107 | client->lease->t1 = client->lease->lifetime / 2; | |
1108 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1109 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1110 | } | |
51debc1e | 1111 | |
022446ad | 1112 | /* arm lifetime timeout */ |
6a0f1f6d | 1113 | r = sd_event_add_time(client->event, &client->timeout_expire, |
fa94c34b | 1114 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1115 | lifetime_timeout, 10 * USEC_PER_MSEC, |
1116 | client_timeout_expire, client); | |
5ee482df TG |
1117 | if (r < 0) |
1118 | return r; | |
51debc1e | 1119 | |
022446ad | 1120 | r = sd_event_source_set_priority(client->timeout_expire, |
e5002702 | 1121 | client->event_priority); |
b25ef18b TG |
1122 | if (r < 0) |
1123 | return r; | |
1124 | ||
9021bb9f TG |
1125 | r = sd_event_source_set_name(client->timeout_expire, |
1126 | "dhcp4-lifetime"); | |
1127 | if (r < 0) | |
1128 | return r; | |
1129 | ||
022446ad TG |
1130 | log_dhcp_client(client, "lease expires in %s", |
1131 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
1132 | lifetime_timeout - time_now, 0)); | |
51debc1e | 1133 | |
022446ad TG |
1134 | /* don't arm earlier timeouts if this has already expired */ |
1135 | if (lifetime_timeout <= time_now) | |
1136 | return 0; | |
51debc1e | 1137 | |
022446ad | 1138 | /* arm T2 timeout */ |
6a0f1f6d LP |
1139 | r = sd_event_add_time(client->event, |
1140 | &client->timeout_t2, | |
fa94c34b | 1141 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1142 | t2_timeout, |
1143 | 10 * USEC_PER_MSEC, | |
1144 | client_timeout_t2, client); | |
5ee482df TG |
1145 | if (r < 0) |
1146 | return r; | |
51debc1e | 1147 | |
e5002702 TG |
1148 | r = sd_event_source_set_priority(client->timeout_t2, |
1149 | client->event_priority); | |
b25ef18b TG |
1150 | if (r < 0) |
1151 | return r; | |
1152 | ||
9021bb9f TG |
1153 | r = sd_event_source_set_name(client->timeout_t2, |
1154 | "dhcp4-t2-timeout"); | |
1155 | if (r < 0) | |
1156 | return r; | |
1157 | ||
022446ad TG |
1158 | log_dhcp_client(client, "T2 expires in %s", |
1159 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
1160 | t2_timeout - time_now, 0)); | |
1161 | ||
1162 | /* don't arm earlier timeout if this has already expired */ | |
1163 | if (t2_timeout <= time_now) | |
1164 | return 0; | |
51debc1e | 1165 | |
022446ad | 1166 | /* arm T1 timeout */ |
6a0f1f6d LP |
1167 | r = sd_event_add_time(client->event, |
1168 | &client->timeout_t1, | |
fa94c34b | 1169 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1170 | t1_timeout, 10 * USEC_PER_MSEC, |
1171 | client_timeout_t1, client); | |
5ee482df TG |
1172 | if (r < 0) |
1173 | return r; | |
51debc1e | 1174 | |
022446ad | 1175 | r = sd_event_source_set_priority(client->timeout_t1, |
e5002702 | 1176 | client->event_priority); |
b25ef18b TG |
1177 | if (r < 0) |
1178 | return r; | |
1179 | ||
9021bb9f TG |
1180 | r = sd_event_source_set_name(client->timeout_t1, |
1181 | "dhcp4-t1-timer"); | |
1182 | if (r < 0) | |
1183 | return r; | |
1184 | ||
022446ad TG |
1185 | log_dhcp_client(client, "T1 expires in %s", |
1186 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, | |
1187 | t1_timeout - time_now, 0)); | |
1188 | ||
51debc1e PF |
1189 | return 0; |
1190 | } | |
1191 | ||
e5002702 | 1192 | static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, |
022446ad | 1193 | int len) { |
574cc928 | 1194 | DHCP_CLIENT_DONT_DESTROY(client); |
e5002702 | 1195 | int r = 0, notify_event = 0; |
8c00042c | 1196 | |
b25ef18b TG |
1197 | assert(client); |
1198 | assert(client->event); | |
e5002702 | 1199 | assert(message); |
b25ef18b | 1200 | |
8c00042c PF |
1201 | switch (client->state) { |
1202 | case DHCP_STATE_SELECTING: | |
1203 | ||
e5002702 TG |
1204 | r = client_handle_offer(client, message, len); |
1205 | if (r >= 0) { | |
8c00042c | 1206 | |
8c00042c PF |
1207 | client->timeout_resend = |
1208 | sd_event_source_unref(client->timeout_resend); | |
1209 | ||
1210 | client->state = DHCP_STATE_REQUESTING; | |
e2dfc79f PF |
1211 | client->attempt = 1; |
1212 | ||
6a0f1f6d LP |
1213 | r = sd_event_add_time(client->event, |
1214 | &client->timeout_resend, | |
fa94c34b | 1215 | clock_boottime_or_monotonic(), |
6a0f1f6d LP |
1216 | 0, 0, |
1217 | client_timeout_resend, client); | |
3e3d8f78 | 1218 | if (r < 0) |
e2dfc79f | 1219 | goto error; |
b25ef18b | 1220 | |
e5002702 TG |
1221 | r = sd_event_source_set_priority(client->timeout_resend, |
1222 | client->event_priority); | |
b25ef18b TG |
1223 | if (r < 0) |
1224 | goto error; | |
9021bb9f TG |
1225 | |
1226 | r = sd_event_source_set_name(client->timeout_resend, | |
1227 | "dhcp4-resend-timer"); | |
1228 | if (r < 0) | |
1229 | goto error; | |
9e64dd72 TG |
1230 | } else if (r == -ENOMSG) |
1231 | /* invalid message, let's ignore it */ | |
1232 | return 0; | |
8c00042c PF |
1233 | |
1234 | break; | |
1235 | ||
8b1243f7 | 1236 | case DHCP_STATE_REBOOTING: |
3e3d8f78 | 1237 | case DHCP_STATE_REQUESTING: |
aba26854 | 1238 | case DHCP_STATE_RENEWING: |
3dd71400 | 1239 | case DHCP_STATE_REBINDING: |
aba26854 | 1240 | |
e5002702 | 1241 | r = client_handle_ack(client, message, len); |
2d2349cc | 1242 | if (r >= 0) { |
3e3d8f78 PF |
1243 | client->timeout_resend = |
1244 | sd_event_source_unref(client->timeout_resend); | |
1245 | ||
8b1243f7 PF |
1246 | if (IN_SET(client->state, DHCP_STATE_REQUESTING, |
1247 | DHCP_STATE_REBOOTING)) | |
aba26854 PF |
1248 | notify_event = DHCP_EVENT_IP_ACQUIRE; |
1249 | else if (r != DHCP_EVENT_IP_ACQUIRE) | |
1250 | notify_event = r; | |
1251 | ||
3e3d8f78 PF |
1252 | client->state = DHCP_STATE_BOUND; |
1253 | client->attempt = 1; | |
1254 | ||
1255 | client->last_addr = client->lease->address; | |
1256 | ||
022446ad | 1257 | r = client_set_lease_timeouts(client); |
aba26854 | 1258 | if (r < 0) |
51debc1e PF |
1259 | goto error; |
1260 | ||
0af03ba5 TG |
1261 | r = dhcp_network_bind_udp_socket(client->lease->address, |
1262 | DHCP_PORT_CLIENT); | |
1263 | if (r < 0) { | |
1264 | log_dhcp_client(client, "could not bind UDP socket"); | |
1265 | goto error; | |
1266 | } | |
1267 | ||
1268 | client->fd = r; | |
1269 | ||
1270 | client_initialize_io_events(client, client_receive_message_udp); | |
1271 | ||
e5b04c8d | 1272 | if (notify_event) { |
574cc928 TG |
1273 | client_notify(client, notify_event); |
1274 | if (client->state == DHCP_STATE_STOPPED) | |
e5b04c8d PF |
1275 | return 0; |
1276 | } | |
3e3d8f78 | 1277 | |
2d2349cc TG |
1278 | } else if (r == -EADDRNOTAVAIL) { |
1279 | /* got a NAK, let's restart the client */ | |
1280 | client->timeout_resend = | |
1281 | sd_event_source_unref(client->timeout_resend); | |
1282 | ||
1283 | r = client_initialize(client); | |
1284 | if (r < 0) | |
1285 | goto error; | |
1286 | ||
1287 | r = client_start(client); | |
1288 | if (r < 0) | |
1289 | goto error; | |
1290 | ||
1291 | log_dhcp_client(client, "REBOOTED"); | |
1292 | ||
1293 | return 0; | |
9e64dd72 TG |
1294 | } else if (r == -ENOMSG) |
1295 | /* invalid message, let's ignore it */ | |
1296 | return 0; | |
97b9372d | 1297 | |
3e3d8f78 PF |
1298 | break; |
1299 | ||
615c1467 TG |
1300 | case DHCP_STATE_BOUND: |
1301 | r = client_handle_forcerenew(client, message, len); | |
1302 | if (r >= 0) { | |
1303 | r = client_timeout_t1(NULL, 0, client); | |
1304 | if (r < 0) | |
1305 | goto error; | |
1306 | } else if (r == -ENOMSG) | |
1307 | /* invalid message, let's ignore it */ | |
1308 | return 0; | |
1309 | ||
1310 | break; | |
1311 | ||
8c00042c PF |
1312 | case DHCP_STATE_INIT: |
1313 | case DHCP_STATE_INIT_REBOOT: | |
8c00042c PF |
1314 | |
1315 | break; | |
781ca7a1 PF |
1316 | |
1317 | case DHCP_STATE_STOPPED: | |
1318 | r = -EINVAL; | |
1319 | goto error; | |
8c00042c PF |
1320 | } |
1321 | ||
1322 | error: | |
2d2349cc | 1323 | if (r < 0) |
e5b04c8d | 1324 | client_stop(client, r); |
e2dfc79f | 1325 | |
e5b04c8d | 1326 | return r; |
8c00042c PF |
1327 | } |
1328 | ||
8f61afd8 | 1329 | static int client_receive_message_udp(sd_event_source *s, int fd, |
e5002702 TG |
1330 | uint32_t revents, void *userdata) { |
1331 | sd_dhcp_client *client = userdata; | |
5266a81e TG |
1332 | _cleanup_free_ DHCPMessage *message = NULL; |
1333 | int buflen = 0, len, r; | |
e5002702 TG |
1334 | |
1335 | assert(s); | |
1336 | assert(client); | |
e5002702 | 1337 | |
5266a81e | 1338 | r = ioctl(fd, FIONREAD, &buflen); |
23289745 TG |
1339 | if (r < 0) |
1340 | return r; | |
1341 | ||
1342 | if (buflen < 0) | |
1343 | /* this can't be right */ | |
1344 | return -EIO; | |
5266a81e TG |
1345 | |
1346 | message = malloc0(buflen); | |
1347 | if (!message) | |
1348 | return -ENOMEM; | |
1349 | ||
1350 | len = read(fd, message, buflen); | |
0c79c68d TG |
1351 | if (len < 0) { |
1352 | log_dhcp_client(client, "could not receive message from UDP " | |
590b6b91 | 1353 | "socket: %m"); |
0c79c68d | 1354 | return 0; |
9fbc2523 TG |
1355 | } else if ((size_t)len < sizeof(DHCPMessage)) { |
1356 | log_dhcp_client(client, "too small to be a DHCP message: ignoring"); | |
e5002702 | 1357 | return 0; |
9fbc2523 TG |
1358 | } |
1359 | ||
1360 | if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) { | |
1361 | log_dhcp_client(client, "not a DHCP message: ignoring"); | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | if (message->op != BOOTREPLY) { | |
1366 | log_dhcp_client(client, "not a BOOTREPLY message: ignoring"); | |
1367 | return 0; | |
1368 | } | |
1369 | ||
9fbc2523 TG |
1370 | if (message->htype != ARPHRD_ETHER || message->hlen != ETHER_ADDR_LEN) { |
1371 | log_dhcp_client(client, "not an ethernet packet"); | |
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | if (memcmp(&message->chaddr[0], &client->client_id.mac_addr, | |
1376 | ETH_ALEN)) { | |
1377 | log_dhcp_client(client, "received chaddr does not match " | |
1378 | "expected: ignoring"); | |
1379 | return 0; | |
1380 | } | |
e5002702 | 1381 | |
615c1467 TG |
1382 | if (client->state != DHCP_STATE_BOUND && |
1383 | be32toh(message->xid) != client->xid) { | |
1384 | /* in BOUND state, we may receive FORCERENEW with xid set by server, | |
1385 | so ignore the xid in this case */ | |
1386 | log_dhcp_client(client, "received xid (%u) does not match " | |
1387 | "expected (%u): ignoring", | |
1388 | be32toh(message->xid), client->xid); | |
1389 | return 0; | |
1390 | } | |
1391 | ||
022446ad | 1392 | return client_handle_message(client, message, len); |
e5002702 TG |
1393 | } |
1394 | ||
8f61afd8 | 1395 | static int client_receive_message_raw(sd_event_source *s, int fd, |
e5002702 TG |
1396 | uint32_t revents, void *userdata) { |
1397 | sd_dhcp_client *client = userdata; | |
5266a81e | 1398 | _cleanup_free_ DHCPPacket *packet = NULL; |
55dab2ed TG |
1399 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; |
1400 | struct iovec iov = {}; | |
1401 | struct msghdr msg = { | |
1402 | .msg_iov = &iov, | |
1403 | .msg_iovlen = 1, | |
1404 | .msg_control = cmsgbuf, | |
1405 | .msg_controllen = sizeof(cmsgbuf), | |
1406 | }; | |
1407 | struct cmsghdr *cmsg; | |
1408 | bool checksum = true; | |
1409 | int buflen = 0, len, r; | |
e5002702 TG |
1410 | |
1411 | assert(s); | |
1412 | assert(client); | |
e5002702 | 1413 | |
5266a81e | 1414 | r = ioctl(fd, FIONREAD, &buflen); |
23289745 TG |
1415 | if (r < 0) |
1416 | return r; | |
1417 | ||
1418 | if (buflen < 0) | |
1419 | /* this can't be right */ | |
1420 | return -EIO; | |
5266a81e TG |
1421 | |
1422 | packet = malloc0(buflen); | |
1423 | if (!packet) | |
1424 | return -ENOMEM; | |
1425 | ||
55dab2ed TG |
1426 | iov.iov_base = packet; |
1427 | iov.iov_len = buflen; | |
1428 | ||
1429 | len = recvmsg(fd, &msg, 0); | |
1430 | if (len < 0) { | |
1431 | log_dhcp_client(client, "could not receive message from raw " | |
590b6b91 | 1432 | "socket: %m"); |
e5002702 | 1433 | return 0; |
0c79c68d TG |
1434 | } else if ((size_t)len < sizeof(DHCPPacket)) |
1435 | return 0; | |
55dab2ed TG |
1436 | |
1437 | for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { | |
48a4612e TG |
1438 | if (cmsg->cmsg_level == SOL_PACKET && |
1439 | cmsg->cmsg_type == PACKET_AUXDATA && | |
1440 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) { | |
1441 | struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg); | |
55dab2ed TG |
1442 | |
1443 | checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY); | |
1444 | break; | |
1445 | } | |
1446 | } | |
e5002702 | 1447 | |
55dab2ed | 1448 | r = dhcp_packet_verify_headers(packet, len, checksum); |
ac4f16ab | 1449 | if (r < 0) |
9fadd4ca | 1450 | return 0; |
e5002702 TG |
1451 | |
1452 | len -= DHCP_IP_UDP_SIZE; | |
1453 | ||
022446ad | 1454 | return client_handle_message(client, &packet->dhcp, len); |
e5002702 TG |
1455 | } |
1456 | ||
5ee482df | 1457 | int sd_dhcp_client_start(sd_dhcp_client *client) { |
db73295a | 1458 | char buffer[ETHER_ADDR_TO_STRING_MAX]; |
6a1cd41e | 1459 | int r; |
d3d8ac2f | 1460 | |
46a66b79 | 1461 | assert_return(client, -EINVAL); |
46a66b79 | 1462 | |
0f941add PF |
1463 | r = client_initialize(client); |
1464 | if (r < 0) | |
6a1cd41e | 1465 | return r; |
8c00042c | 1466 | |
0f941add PF |
1467 | if (client->last_addr) |
1468 | client->state = DHCP_STATE_INIT_REBOOT; | |
d3d8ac2f | 1469 | |
998d8047 TG |
1470 | r = client_start(client); |
1471 | if (r >= 0) | |
63175195 TG |
1472 | log_dhcp_client(client, "STARTED on ifindex %u with address %s", |
1473 | client->index, | |
db73295a | 1474 | ether_addr_to_string(&client->client_id.mac_addr, buffer)); |
998d8047 TG |
1475 | |
1476 | return r; | |
46a66b79 PF |
1477 | } |
1478 | ||
5ee482df | 1479 | int sd_dhcp_client_stop(sd_dhcp_client *client) { |
574cc928 TG |
1480 | DHCP_CLIENT_DONT_DESTROY(client); |
1481 | ||
e5b04c8d PF |
1482 | assert_return(client, -EINVAL); |
1483 | ||
574cc928 TG |
1484 | client_stop(client, DHCP_EVENT_STOP); |
1485 | client->state = DHCP_STATE_STOPPED; | |
e5b04c8d PF |
1486 | |
1487 | return 0; | |
bbdf06d9 PF |
1488 | } |
1489 | ||
e5002702 TG |
1490 | int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, |
1491 | int priority) { | |
b25ef18b TG |
1492 | int r; |
1493 | ||
1494 | assert_return(client, -EINVAL); | |
1495 | assert_return(!client->event, -EBUSY); | |
1496 | ||
1497 | if (event) | |
1498 | client->event = sd_event_ref(event); | |
1499 | else { | |
1500 | r = sd_event_default(&client->event); | |
1501 | if (r < 0) | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | client->event_priority = priority; | |
1506 | ||
1507 | return 0; | |
1508 | } | |
1509 | ||
1510 | int sd_dhcp_client_detach_event(sd_dhcp_client *client) { | |
1511 | assert_return(client, -EINVAL); | |
1512 | ||
1513 | client->event = sd_event_unref(client->event); | |
1514 | ||
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { | |
1519 | if (!client) | |
1520 | return NULL; | |
1521 | ||
1522 | return client->event; | |
1523 | } | |
1524 | ||
e5b04c8d PF |
1525 | sd_dhcp_client *sd_dhcp_client_ref(sd_dhcp_client *client) { |
1526 | if (client) | |
1527 | assert_se(REFCNT_INC(client->n_ref) >= 2); | |
1528 | ||
1529 | return client; | |
1530 | } | |
1531 | ||
1532 | sd_dhcp_client *sd_dhcp_client_unref(sd_dhcp_client *client) { | |
1533 | if (client && REFCNT_DEC(client->n_ref) <= 0) { | |
574cc928 | 1534 | log_dhcp_client(client, "FREE"); |
d2fe46b5 | 1535 | |
e5b04c8d PF |
1536 | client_initialize(client); |
1537 | ||
1538 | client->receive_message = | |
1539 | sd_event_source_unref(client->receive_message); | |
1540 | ||
1541 | sd_dhcp_client_detach_event(client); | |
1542 | ||
6e00a806 ZJS |
1543 | sd_dhcp_lease_unref(client->lease); |
1544 | ||
e5b04c8d | 1545 | free(client->req_opts); |
4cc7a82c | 1546 | free(client->hostname); |
edb85f0d | 1547 | free(client->vendor_class_identifier); |
e5b04c8d | 1548 | free(client); |
e5b04c8d | 1549 | } |
d2fe46b5 | 1550 | |
574cc928 | 1551 | return NULL; |
d2fe46b5 PF |
1552 | } |
1553 | ||
b25ef18b | 1554 | int sd_dhcp_client_new(sd_dhcp_client **ret) { |
574cc928 | 1555 | _cleanup_dhcp_client_unref_ sd_dhcp_client *client = NULL; |
011feef8 | 1556 | |
b25ef18b | 1557 | assert_return(ret, -EINVAL); |
d3d8ac2f | 1558 | |
011feef8 PF |
1559 | client = new0(sd_dhcp_client, 1); |
1560 | if (!client) | |
b25ef18b | 1561 | return -ENOMEM; |
011feef8 | 1562 | |
e5b04c8d | 1563 | client->n_ref = REFCNT_INIT; |
011feef8 PF |
1564 | client->state = DHCP_STATE_INIT; |
1565 | client->index = -1; | |
8c00042c | 1566 | client->fd = -1; |
e2dfc79f | 1567 | client->attempt = 1; |
324f8187 | 1568 | client->mtu = DHCP_DEFAULT_MIN_SIZE; |
011feef8 PF |
1569 | |
1570 | client->req_opts_size = ELEMENTSOF(default_req_opts); | |
1571 | ||
1572 | client->req_opts = memdup(default_req_opts, client->req_opts_size); | |
b25ef18b TG |
1573 | if (!client->req_opts) |
1574 | return -ENOMEM; | |
1575 | ||
1576 | *ret = client; | |
1577 | client = NULL; | |
011feef8 | 1578 | |
b25ef18b | 1579 | return 0; |
011feef8 | 1580 | } |