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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
011feef8 | 2 | /*** |
810adae9 | 3 | Copyright © 2013 Intel Corporation. All rights reserved. |
011feef8 PF |
4 | ***/ |
5 | ||
011feef8 | 6 | #include <errno.h> |
46a66b79 | 7 | #include <net/ethernet.h> |
3b7ca119 | 8 | #include <net/if_arp.h> |
07630cea LP |
9 | #include <stdio.h> |
10 | #include <stdlib.h> | |
11 | #include <string.h> | |
5266a81e | 12 | #include <sys/ioctl.h> |
07630cea | 13 | #include <linux/if_infiniband.h> |
011feef8 | 14 | |
07630cea | 15 | #include "sd-dhcp-client.h" |
011feef8 | 16 | |
b5efdb8a | 17 | #include "alloc-util.h" |
07630cea LP |
18 | #include "async.h" |
19 | #include "dhcp-identifier.h" | |
46a66b79 | 20 | #include "dhcp-internal.h" |
fe8db0c5 | 21 | #include "dhcp-lease-internal.h" |
07630cea | 22 | #include "dhcp-protocol.h" |
23873e25 | 23 | #include "dns-domain.h" |
a3fa4287 | 24 | #include "event-util.h" |
23873e25 | 25 | #include "hostname-util.h" |
07630cea LP |
26 | #include "random-util.h" |
27 | #include "string-util.h" | |
28 | #include "util.h" | |
af1c0de0 | 29 | #include "strv.h" |
011feef8 | 30 | |
5bac5235 | 31 | #define MAX_CLIENT_ID_LEN (sizeof(uint32_t) + MAX_DUID_LEN) /* Arbitrary limit */ |
dd168445 | 32 | #define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN) |
76253e73 | 33 | |
1d1a3e0a BG |
34 | #define RESTART_AFTER_NAK_MIN_USEC (1 * USEC_PER_SEC) |
35 | #define RESTART_AFTER_NAK_MAX_USEC (30 * USEC_PER_MINUTE) | |
36 | ||
011feef8 | 37 | struct sd_dhcp_client { |
3733eec3 | 38 | unsigned n_ref; |
e5b04c8d | 39 | |
011feef8 | 40 | DHCPState state; |
d3d8ac2f | 41 | sd_event *event; |
b25ef18b | 42 | int event_priority; |
d3d8ac2f | 43 | sd_event_source *timeout_resend; |
2f8e7633 | 44 | int ifindex; |
8c00042c | 45 | int fd; |
9faed222 | 46 | uint16_t port; |
8c00042c PF |
47 | union sockaddr_union link; |
48 | sd_event_source *receive_message; | |
f5de5b00 | 49 | bool request_broadcast; |
011feef8 | 50 | uint8_t *req_opts; |
7a7c74ca | 51 | size_t req_opts_allocated; |
011feef8 | 52 | size_t req_opts_size; |
db3d2358 | 53 | bool anonymize; |
3b349af6 | 54 | be32_t last_addr; |
76253e73 DW |
55 | uint8_t mac_addr[MAX_MAC_ADDR_LEN]; |
56 | size_t mac_addr_len; | |
57 | uint16_t arp_type; | |
5bac5235 TG |
58 | struct { |
59 | uint8_t type; | |
60 | union { | |
61 | struct { | |
62 | /* 0: Generic (non-LL) (RFC 2132) */ | |
63 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
64 | } _packed_ gen; | |
65 | struct { | |
66 | /* 1: Ethernet Link-Layer (RFC 2132) */ | |
67 | uint8_t haddr[ETH_ALEN]; | |
68 | } _packed_ eth; | |
69 | struct { | |
70 | /* 2 - 254: ARP/Link-Layer (RFC 2132) */ | |
71 | uint8_t haddr[0]; | |
72 | } _packed_ ll; | |
73 | struct { | |
74 | /* 255: Node-specific (RFC 4361) */ | |
413708d1 | 75 | be32_t iaid; |
5bac5235 TG |
76 | struct duid duid; |
77 | } _packed_ ns; | |
78 | struct { | |
79 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
80 | } _packed_ raw; | |
81 | }; | |
82 | } _packed_ client_id; | |
ba6c0fd6 | 83 | size_t client_id_len; |
4cc7a82c | 84 | char *hostname; |
edb85f0d | 85 | char *vendor_class_identifier; |
af1c0de0 | 86 | char **user_class; |
324f8187 | 87 | uint32_t mtu; |
46a66b79 | 88 | uint32_t xid; |
d3d8ac2f | 89 | usec_t start_time; |
14cb109d | 90 | unsigned attempt; |
51debc1e PF |
91 | usec_t request_sent; |
92 | sd_event_source *timeout_t1; | |
93 | sd_event_source *timeout_t2; | |
94 | sd_event_source *timeout_expire; | |
45aa74c7 | 95 | sd_dhcp_client_callback_t callback; |
751246ee | 96 | void *userdata; |
a6cc569e | 97 | sd_dhcp_lease *lease; |
1d1a3e0a | 98 | usec_t start_delay; |
011feef8 PF |
99 | }; |
100 | ||
101 | static const uint8_t default_req_opts[] = { | |
22805d92 BG |
102 | SD_DHCP_OPTION_SUBNET_MASK, |
103 | SD_DHCP_OPTION_ROUTER, | |
104 | SD_DHCP_OPTION_HOST_NAME, | |
105 | SD_DHCP_OPTION_DOMAIN_NAME, | |
106 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, | |
011feef8 PF |
107 | }; |
108 | ||
db3d2358 | 109 | /* RFC7844 section 3: |
110 | MAY contain the Parameter Request List option. | |
111 | RFC7844 section 3.6: | |
112 | The client intending to protect its privacy SHOULD only request a | |
113 | minimal number of options in the PRL and SHOULD also randomly shuffle | |
114 | the ordering of option codes in the PRL. If this random ordering | |
115 | cannot be implemented, the client MAY order the option codes in the | |
116 | PRL by option code number (lowest to highest). | |
117 | */ | |
118 | /* NOTE: using PRL options that Windows 10 RFC7844 implementation uses */ | |
119 | static const uint8_t default_req_opts_anonymize[] = { | |
120 | SD_DHCP_OPTION_SUBNET_MASK, /* 1 */ | |
121 | SD_DHCP_OPTION_ROUTER, /* 3 */ | |
122 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, /* 6 */ | |
123 | SD_DHCP_OPTION_DOMAIN_NAME, /* 15 */ | |
124 | SD_DHCP_OPTION_ROUTER_DISCOVER, /* 31 */ | |
125 | SD_DHCP_OPTION_STATIC_ROUTE, /* 33 */ | |
126 | SD_DHCP_OPTION_VENDOR_SPECIFIC, /* 43 */ | |
127 | SD_DHCP_OPTION_NETBIOS_NAMESERVER, /* 44 */ | |
128 | SD_DHCP_OPTION_NETBIOS_NODETYPE, /* 46 */ | |
129 | SD_DHCP_OPTION_NETBIOS_SCOPE, /* 47 */ | |
130 | SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE, /* 121 */ | |
131 | SD_DHCP_OPTION_PRIVATE_CLASSLESS_STATIC_ROUTE, /* 249 */ | |
132 | SD_DHCP_OPTION_PRIVATE_PROXY_AUTODISCOVERY, /* 252 */ | |
133 | }; | |
134 | ||
4b558378 ZJS |
135 | static int client_receive_message_raw( |
136 | sd_event_source *s, | |
137 | int fd, | |
138 | uint32_t revents, | |
139 | void *userdata); | |
140 | static int client_receive_message_udp( | |
141 | sd_event_source *s, | |
142 | int fd, | |
143 | uint32_t revents, | |
144 | void *userdata); | |
574cc928 | 145 | static void client_stop(sd_dhcp_client *client, int error); |
aba26854 | 146 | |
4b558378 ZJS |
147 | int sd_dhcp_client_set_callback( |
148 | sd_dhcp_client *client, | |
149 | sd_dhcp_client_callback_t cb, | |
150 | void *userdata) { | |
45aa74c7 | 151 | |
751246ee PF |
152 | assert_return(client, -EINVAL); |
153 | ||
45aa74c7 | 154 | client->callback = cb; |
751246ee PF |
155 | client->userdata = userdata; |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
f5de5b00 TG |
160 | int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) { |
161 | assert_return(client, -EINVAL); | |
162 | ||
163 | client->request_broadcast = !!broadcast; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
5ee482df | 168 | int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) { |
011feef8 PF |
169 | size_t i; |
170 | ||
171 | assert_return(client, -EINVAL); | |
a1140666 | 172 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); |
011feef8 PF |
173 | |
174 | switch(option) { | |
a1140666 | 175 | |
22805d92 BG |
176 | case SD_DHCP_OPTION_PAD: |
177 | case SD_DHCP_OPTION_OVERLOAD: | |
178 | case SD_DHCP_OPTION_MESSAGE_TYPE: | |
179 | case SD_DHCP_OPTION_PARAMETER_REQUEST_LIST: | |
180 | case SD_DHCP_OPTION_END: | |
011feef8 PF |
181 | return -EINVAL; |
182 | ||
183 | default: | |
184 | break; | |
185 | } | |
186 | ||
187 | for (i = 0; i < client->req_opts_size; i++) | |
188 | if (client->req_opts[i] == option) | |
189 | return -EEXIST; | |
190 | ||
7a7c74ca | 191 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, |
011feef8 PF |
192 | client->req_opts_size + 1)) |
193 | return -ENOMEM; | |
194 | ||
7a7c74ca | 195 | client->req_opts[client->req_opts_size++] = option; |
011feef8 PF |
196 | |
197 | return 0; | |
198 | } | |
199 | ||
4b558378 ZJS |
200 | int sd_dhcp_client_set_request_address( |
201 | sd_dhcp_client *client, | |
202 | const struct in_addr *last_addr) { | |
a1140666 | 203 | |
011feef8 | 204 | assert_return(client, -EINVAL); |
a1140666 | 205 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); |
011feef8 PF |
206 | |
207 | if (last_addr) | |
208 | client->last_addr = last_addr->s_addr; | |
209 | else | |
210 | client->last_addr = INADDR_ANY; | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
2f8e7633 | 215 | int sd_dhcp_client_set_ifindex(sd_dhcp_client *client, int ifindex) { |
011feef8 | 216 | |
2f8e7633 LP |
217 | assert_return(client, -EINVAL); |
218 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); | |
219 | assert_return(ifindex > 0, -EINVAL); | |
011feef8 | 220 | |
2f8e7633 | 221 | client->ifindex = ifindex; |
011feef8 PF |
222 | return 0; |
223 | } | |
224 | ||
4b558378 ZJS |
225 | int sd_dhcp_client_set_mac( |
226 | sd_dhcp_client *client, | |
227 | const uint8_t *addr, | |
228 | size_t addr_len, | |
229 | uint16_t arp_type) { | |
230 | ||
574cc928 | 231 | DHCP_CLIENT_DONT_DESTROY(client); |
4644fee0 TG |
232 | bool need_restart = false; |
233 | ||
46a66b79 | 234 | assert_return(client, -EINVAL); |
4644fee0 | 235 | assert_return(addr, -EINVAL); |
76253e73 DW |
236 | assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); |
237 | assert_return(arp_type > 0, -EINVAL); | |
238 | ||
239 | if (arp_type == ARPHRD_ETHER) | |
240 | assert_return(addr_len == ETH_ALEN, -EINVAL); | |
241 | else if (arp_type == ARPHRD_INFINIBAND) | |
242 | assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); | |
243 | else | |
244 | return -EINVAL; | |
46a66b79 | 245 | |
76253e73 DW |
246 | if (client->mac_addr_len == addr_len && |
247 | memcmp(&client->mac_addr, addr, addr_len) == 0) | |
4644fee0 TG |
248 | return 0; |
249 | ||
781ca7a1 | 250 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { |
a1140666 | 251 | log_dhcp_client(client, "Changing MAC address on running DHCP client, restarting"); |
4644fee0 | 252 | need_restart = true; |
03748142 | 253 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
4644fee0 | 254 | } |
02ec5cd7 | 255 | |
76253e73 DW |
256 | memcpy(&client->mac_addr, addr, addr_len); |
257 | client->mac_addr_len = addr_len; | |
258 | client->arp_type = arp_type; | |
259 | ||
ba6c0fd6 DW |
260 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
261 | sd_dhcp_client_start(client); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
4b558378 ZJS |
266 | int sd_dhcp_client_get_client_id( |
267 | sd_dhcp_client *client, | |
268 | uint8_t *type, | |
269 | const uint8_t **data, | |
270 | size_t *data_len) { | |
ba6c0fd6 DW |
271 | |
272 | assert_return(client, -EINVAL); | |
273 | assert_return(type, -EINVAL); | |
274 | assert_return(data, -EINVAL); | |
275 | assert_return(data_len, -EINVAL); | |
276 | ||
277 | *type = 0; | |
278 | *data = NULL; | |
279 | *data_len = 0; | |
280 | if (client->client_id_len) { | |
5bac5235 | 281 | *type = client->client_id.type; |
ba6c0fd6 | 282 | *data = client->client_id.raw.data; |
5bac5235 | 283 | *data_len = client->client_id_len - sizeof(client->client_id.type); |
ba6c0fd6 DW |
284 | } |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
4b558378 ZJS |
289 | int sd_dhcp_client_set_client_id( |
290 | sd_dhcp_client *client, | |
291 | uint8_t type, | |
292 | const uint8_t *data, | |
293 | size_t data_len) { | |
294 | ||
ba6c0fd6 DW |
295 | DHCP_CLIENT_DONT_DESTROY(client); |
296 | bool need_restart = false; | |
297 | ||
298 | assert_return(client, -EINVAL); | |
299 | assert_return(data, -EINVAL); | |
300 | assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL); | |
301 | ||
302 | switch (type) { | |
a1140666 | 303 | |
ba6c0fd6 DW |
304 | case ARPHRD_ETHER: |
305 | if (data_len != ETH_ALEN) | |
306 | return -EINVAL; | |
307 | break; | |
a1140666 | 308 | |
ba6c0fd6 DW |
309 | case ARPHRD_INFINIBAND: |
310 | if (data_len != INFINIBAND_ALEN) | |
311 | return -EINVAL; | |
312 | break; | |
a1140666 | 313 | |
ba6c0fd6 DW |
314 | default: |
315 | break; | |
316 | } | |
317 | ||
5bac5235 TG |
318 | if (client->client_id_len == data_len + sizeof(client->client_id.type) && |
319 | client->client_id.type == type && | |
ba6c0fd6 DW |
320 | memcmp(&client->client_id.raw.data, data, data_len) == 0) |
321 | return 0; | |
322 | ||
323 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { | |
324 | log_dhcp_client(client, "Changing client ID on running DHCP " | |
325 | "client, restarting"); | |
326 | need_restart = true; | |
03748142 | 327 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
ba6c0fd6 DW |
328 | } |
329 | ||
5bac5235 | 330 | client->client_id.type = type; |
ba6c0fd6 | 331 | memcpy(&client->client_id.raw.data, data, data_len); |
5bac5235 | 332 | client->client_id_len = data_len + sizeof (client->client_id.type); |
46a66b79 | 333 | |
781ca7a1 | 334 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
4644fee0 TG |
335 | sd_dhcp_client_start(client); |
336 | ||
46a66b79 PF |
337 | return 0; |
338 | } | |
339 | ||
d7df2fd3 ZJS |
340 | /** |
341 | * Sets IAID and DUID. If duid is non-null, the DUID is set to duid_type + duid | |
342 | * without further modification. Otherwise, if duid_type is supported, DUID | |
343 | * is set based on that type. Otherwise, an error is returned. | |
344 | */ | |
7e90a499 | 345 | static int dhcp_client_set_iaid_duid_internal( |
4b558378 ZJS |
346 | sd_dhcp_client *client, |
347 | uint32_t iaid, | |
dace710c | 348 | bool append_iaid, |
4b558378 | 349 | uint16_t duid_type, |
f7a92d1a | 350 | const void *duid, |
7e90a499 YW |
351 | size_t duid_len, |
352 | usec_t llt_time) { | |
4b558378 | 353 | |
413708d1 VK |
354 | DHCP_CLIENT_DONT_DESTROY(client); |
355 | int r; | |
d7df2fd3 ZJS |
356 | size_t len; |
357 | ||
413708d1 | 358 | assert_return(client, -EINVAL); |
d7df2fd3 ZJS |
359 | assert_return(duid_len == 0 || duid != NULL, -EINVAL); |
360 | ||
361 | if (duid != NULL) { | |
362 | r = dhcp_validate_duid_len(duid_type, duid_len); | |
363 | if (r < 0) | |
364 | return r; | |
365 | } | |
413708d1 | 366 | |
d7df2fd3 | 367 | zero(client->client_id); |
413708d1 VK |
368 | client->client_id.type = 255; |
369 | ||
dace710c YW |
370 | if (append_iaid) { |
371 | /* If IAID is not configured, generate it. */ | |
372 | if (iaid == 0) { | |
373 | r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, | |
374 | client->mac_addr_len, | |
6d13616b | 375 | true, |
dace710c YW |
376 | &client->client_id.ns.iaid); |
377 | if (r < 0) | |
378 | return r; | |
379 | } else | |
380 | client->client_id.ns.iaid = htobe32(iaid); | |
381 | } | |
413708d1 | 382 | |
d7df2fd3 | 383 | if (duid != NULL) { |
413708d1 VK |
384 | client->client_id.ns.duid.type = htobe16(duid_type); |
385 | memcpy(&client->client_id.ns.duid.raw.data, duid, duid_len); | |
d7df2fd3 | 386 | len = sizeof(client->client_id.ns.duid.type) + duid_len; |
d7df2fd3 | 387 | } else |
27eba50e | 388 | switch (duid_type) { |
335f80a6 | 389 | case DUID_TYPE_LLT: |
339697f0 | 390 | if (client->mac_addr_len == 0) |
335f80a6 YW |
391 | return -EOPNOTSUPP; |
392 | ||
7e90a499 | 393 | r = dhcp_identifier_set_duid_llt(&client->client_id.ns.duid, llt_time, client->mac_addr, client->mac_addr_len, client->arp_type, &len); |
335f80a6 YW |
394 | if (r < 0) |
395 | return r; | |
396 | break; | |
27eba50e YW |
397 | case DUID_TYPE_EN: |
398 | r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &len); | |
399 | if (r < 0) | |
400 | return r; | |
401 | break; | |
335f80a6 | 402 | case DUID_TYPE_LL: |
339697f0 | 403 | if (client->mac_addr_len == 0) |
335f80a6 YW |
404 | return -EOPNOTSUPP; |
405 | ||
406 | r = dhcp_identifier_set_duid_ll(&client->client_id.ns.duid, client->mac_addr, client->mac_addr_len, client->arp_type, &len); | |
407 | if (r < 0) | |
408 | return r; | |
409 | break; | |
27eba50e YW |
410 | case DUID_TYPE_UUID: |
411 | r = dhcp_identifier_set_duid_uuid(&client->client_id.ns.duid, &len); | |
412 | if (r < 0) | |
413 | return r; | |
414 | break; | |
415 | default: | |
335f80a6 | 416 | return -EINVAL; |
27eba50e | 417 | } |
413708d1 | 418 | |
d7df2fd3 | 419 | client->client_id_len = sizeof(client->client_id.type) + len + |
dace710c | 420 | (append_iaid ? sizeof(client->client_id.ns.iaid) : 0); |
413708d1 VK |
421 | |
422 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { | |
f7708f3f | 423 | log_dhcp_client(client, "Configured %sDUID, restarting.", append_iaid ? "IAID+" : ""); |
413708d1 VK |
424 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
425 | sd_dhcp_client_start(client); | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
dace710c YW |
431 | int sd_dhcp_client_set_iaid_duid( |
432 | sd_dhcp_client *client, | |
433 | uint32_t iaid, | |
434 | uint16_t duid_type, | |
435 | const void *duid, | |
436 | size_t duid_len) { | |
7e90a499 YW |
437 | return dhcp_client_set_iaid_duid_internal(client, iaid, true, duid_type, duid, duid_len, 0); |
438 | } | |
439 | ||
440 | int sd_dhcp_client_set_iaid_duid_llt( | |
441 | sd_dhcp_client *client, | |
442 | uint32_t iaid, | |
443 | usec_t llt_time) { | |
444 | return dhcp_client_set_iaid_duid_internal(client, iaid, true, DUID_TYPE_LLT, NULL, 0, llt_time); | |
dace710c YW |
445 | } |
446 | ||
447 | int sd_dhcp_client_set_duid( | |
448 | sd_dhcp_client *client, | |
449 | uint16_t duid_type, | |
450 | const void *duid, | |
451 | size_t duid_len) { | |
7e90a499 YW |
452 | return dhcp_client_set_iaid_duid_internal(client, 0, false, duid_type, duid, duid_len, 0); |
453 | } | |
454 | ||
455 | int sd_dhcp_client_set_duid_llt( | |
456 | sd_dhcp_client *client, | |
457 | usec_t llt_time) { | |
458 | return dhcp_client_set_iaid_duid_internal(client, 0, false, DUID_TYPE_LLT, NULL, 0, llt_time); | |
dace710c YW |
459 | } |
460 | ||
4b558378 ZJS |
461 | int sd_dhcp_client_set_hostname( |
462 | sd_dhcp_client *client, | |
463 | const char *hostname) { | |
464 | ||
4cc7a82c EY |
465 | assert_return(client, -EINVAL); |
466 | ||
9740eae6 | 467 | /* Make sure hostnames qualify as DNS and as Linux hostnames */ |
ef8b0084 | 468 | if (hostname && |
9740eae6 | 469 | !(hostname_is_valid(hostname, false) && dns_name_is_valid(hostname) > 0)) |
23873e25 BG |
470 | return -EINVAL; |
471 | ||
ef8b0084 | 472 | return free_and_strdup(&client->hostname, hostname); |
4cc7a82c EY |
473 | } |
474 | ||
4b558378 ZJS |
475 | int sd_dhcp_client_set_vendor_class_identifier( |
476 | sd_dhcp_client *client, | |
477 | const char *vci) { | |
478 | ||
edb85f0d SS |
479 | assert_return(client, -EINVAL); |
480 | ||
ef8b0084 | 481 | return free_and_strdup(&client->vendor_class_identifier, vci); |
edb85f0d SS |
482 | } |
483 | ||
af1c0de0 SS |
484 | int sd_dhcp_client_set_user_class( |
485 | sd_dhcp_client *client, | |
486 | const char* const* user_class) { | |
487 | ||
488 | _cleanup_strv_free_ char **s = NULL; | |
489 | char **p; | |
490 | ||
491 | STRV_FOREACH(p, (char **) user_class) | |
492 | if (strlen(*p) > 255) | |
493 | return -ENAMETOOLONG; | |
494 | ||
495 | s = strv_copy((char **) user_class); | |
496 | if (!s) | |
497 | return -ENOMEM; | |
498 | ||
499 | client->user_class = TAKE_PTR(s); | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
9faed222 SS |
504 | int sd_dhcp_client_set_client_port( |
505 | sd_dhcp_client *client, | |
506 | uint16_t port) { | |
507 | ||
508 | assert_return(client, -EINVAL); | |
509 | ||
510 | client->port = port; | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
324f8187 TG |
515 | int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) { |
516 | assert_return(client, -EINVAL); | |
517 | assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE); | |
518 | ||
519 | client->mtu = mtu; | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
a6cc569e | 524 | int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) { |
751246ee | 525 | assert_return(client, -EINVAL); |
751246ee | 526 | |
ec2ce0c5 | 527 | if (!IN_SET(client->state, DHCP_STATE_BOUND, DHCP_STATE_RENEWING, DHCP_STATE_REBINDING)) |
a6cc569e | 528 | return -EADDRNOTAVAIL; |
751246ee | 529 | |
a1140666 LP |
530 | if (ret) |
531 | *ret = client->lease; | |
4f882b2a TG |
532 | |
533 | return 0; | |
534 | } | |
535 | ||
574cc928 | 536 | static void client_notify(sd_dhcp_client *client, int event) { |
45aa74c7 LP |
537 | assert(client); |
538 | ||
539 | if (client->callback) | |
540 | client->callback(client, event, client->userdata); | |
3e3d8f78 PF |
541 | } |
542 | ||
0f941add | 543 | static int client_initialize(sd_dhcp_client *client) { |
bbdf06d9 | 544 | assert_return(client, -EINVAL); |
bbdf06d9 | 545 | |
a1140666 | 546 | client->receive_message = sd_event_source_unref(client->receive_message); |
8c00042c | 547 | |
22fc2420 | 548 | client->fd = asynchronous_close(client->fd); |
8c00042c | 549 | |
a3fa4287 YW |
550 | (void) event_source_disable(client->timeout_resend); |
551 | (void) event_source_disable(client->timeout_t1); | |
552 | (void) event_source_disable(client->timeout_t2); | |
553 | (void) event_source_disable(client->timeout_expire); | |
51debc1e | 554 | |
e2dfc79f PF |
555 | client->attempt = 1; |
556 | ||
f8fdefe4 | 557 | client->state = DHCP_STATE_INIT; |
0f941add | 558 | client->xid = 0; |
bbdf06d9 | 559 | |
0339cd77 | 560 | client->lease = sd_dhcp_lease_unref(client->lease); |
8c00042c | 561 | |
0f941add PF |
562 | return 0; |
563 | } | |
564 | ||
574cc928 TG |
565 | static void client_stop(sd_dhcp_client *client, int error) { |
566 | assert(client); | |
0f941add | 567 | |
ccfdc9a1 UTL |
568 | if (error < 0) |
569 | log_dhcp_client(client, "STOPPED: %s", strerror(-error)); | |
03748142 | 570 | else if (error == SD_DHCP_CLIENT_EVENT_STOP) |
2d2349cc TG |
571 | log_dhcp_client(client, "STOPPED"); |
572 | else | |
573 | log_dhcp_client(client, "STOPPED: Unknown event"); | |
0f941add | 574 | |
574cc928 | 575 | client_notify(client, error); |
ee57a737 | 576 | |
574cc928 | 577 | client_initialize(client); |
bbdf06d9 PF |
578 | } |
579 | ||
4b558378 ZJS |
580 | static int client_message_init( |
581 | sd_dhcp_client *client, | |
582 | DHCPPacket **ret, | |
583 | uint8_t type, | |
584 | size_t *_optlen, | |
585 | size_t *_optoffset) { | |
586 | ||
3587161a | 587 | _cleanup_free_ DHCPPacket *packet = NULL; |
424a8732 | 588 | size_t optlen, optoffset, size; |
8a9e7616 | 589 | be16_t max_size; |
d8d74ef0 DW |
590 | usec_t time_now; |
591 | uint16_t secs; | |
cf597f65 | 592 | int r; |
46a66b79 | 593 | |
6236f49b | 594 | assert(client); |
d8d74ef0 | 595 | assert(client->start_time); |
424a8732 TG |
596 | assert(ret); |
597 | assert(_optlen); | |
598 | assert(_optoffset); | |
4c701096 | 599 | assert(IN_SET(type, DHCP_DISCOVER, DHCP_REQUEST)); |
0a1b6da8 | 600 | |
424a8732 TG |
601 | optlen = DHCP_MIN_OPTIONS_SIZE; |
602 | size = sizeof(DHCPPacket) + optlen; | |
603 | ||
604 | packet = malloc0(size); | |
605 | if (!packet) | |
606 | return -ENOMEM; | |
607 | ||
608 | r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type, | |
76253e73 | 609 | client->arp_type, optlen, &optoffset); |
cf597f65 TG |
610 | if (r < 0) |
611 | return r; | |
46a66b79 | 612 | |
0a1b6da8 TG |
613 | /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers |
614 | refuse to issue an DHCP lease if 'secs' is set to zero */ | |
d8d74ef0 DW |
615 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
616 | if (r < 0) | |
617 | return r; | |
618 | assert(time_now >= client->start_time); | |
619 | ||
620 | /* seconds between sending first and last DISCOVER | |
621 | * must always be strictly positive to deal with broken servers */ | |
622 | secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1; | |
623 | packet->dhcp.secs = htobe16(secs); | |
0a1b6da8 | 624 | |
63a07041 CA |
625 | /* RFC2132 section 4.1 |
626 | A client that cannot receive unicast IP datagrams until its protocol | |
627 | software has been configured with an IP address SHOULD set the | |
628 | BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or | |
629 | DHCPREQUEST messages that client sends. The BROADCAST bit will | |
630 | provide a hint to the DHCP server and BOOTP relay agent to broadcast | |
f5de5b00 TG |
631 | any messages to the client on the client's subnet. |
632 | ||
633 | Note: some interfaces needs this to be enabled, but some networks | |
634 | needs this to be disabled as broadcasts are filteretd, so this | |
635 | needs to be configurable */ | |
76253e73 | 636 | if (client->request_broadcast || client->arp_type != ARPHRD_ETHER) |
f5de5b00 | 637 | packet->dhcp.flags = htobe16(0x8000); |
63a07041 | 638 | |
50d6810e TG |
639 | /* RFC2132 section 4.1.1: |
640 | The client MUST include its hardware address in the ’chaddr’ field, if | |
76253e73 DW |
641 | necessary for delivery of DHCP reply messages. Non-Ethernet |
642 | interfaces will leave 'chaddr' empty and use the client identifier | |
643 | instead (eg, RFC 4390 section 2.1). | |
50d6810e | 644 | */ |
76253e73 DW |
645 | if (client->arp_type == ARPHRD_ETHER) |
646 | memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN); | |
f5a70de7 | 647 | |
afec4539 | 648 | /* If no client identifier exists, construct an RFC 4361-compliant one */ |
5bac5235 TG |
649 | if (client->client_id_len == 0) { |
650 | size_t duid_len; | |
651 | ||
652 | client->client_id.type = 255; | |
653 | ||
6d13616b TH |
654 | r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, |
655 | true, &client->client_id.ns.iaid); | |
5bac5235 TG |
656 | if (r < 0) |
657 | return r; | |
658 | ||
659 | r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &duid_len); | |
660 | if (r < 0) | |
661 | return r; | |
662 | ||
663 | client->client_id_len = sizeof(client->client_id.type) + sizeof(client->client_id.ns.iaid) + duid_len; | |
ba6c0fd6 DW |
664 | } |
665 | ||
ee57a737 | 666 | /* Some DHCP servers will refuse to issue an DHCP lease if the Client |
46a66b79 | 667 | Identifier option is not set */ |
ba6c0fd6 DW |
668 | if (client->client_id_len) { |
669 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, | |
22805d92 | 670 | SD_DHCP_OPTION_CLIENT_IDENTIFIER, |
ba6c0fd6 | 671 | client->client_id_len, |
5bac5235 | 672 | &client->client_id); |
ba6c0fd6 DW |
673 | if (r < 0) |
674 | return r; | |
675 | } | |
50d6810e TG |
676 | |
677 | /* RFC2131 section 3.5: | |
678 | in its initial DHCPDISCOVER or DHCPREQUEST message, a | |
679 | client may provide the server with a list of specific | |
680 | parameters the client is interested in. If the client | |
681 | includes a list of parameters in a DHCPDISCOVER message, | |
682 | it MUST include that list in any subsequent DHCPREQUEST | |
683 | messages. | |
684 | */ | |
5e77a146 | 685 | |
686 | /* RFC7844 section 3: | |
687 | MAY contain the Parameter Request List option. */ | |
688 | /* NOTE: in case that there would be an option to do not send | |
689 | * any PRL at all, the size should be checked before sending */ | |
690 | if (client->req_opts_size > 0) { | |
691 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, | |
692 | SD_DHCP_OPTION_PARAMETER_REQUEST_LIST, | |
693 | client->req_opts_size, client->req_opts); | |
694 | if (r < 0) | |
695 | return r; | |
696 | } | |
8a9e7616 | 697 | |
50d6810e TG |
698 | /* RFC2131 section 3.5: |
699 | The client SHOULD include the ’maximum DHCP message size’ option to | |
700 | let the server know how large the server may make its DHCP messages. | |
701 | ||
702 | Note (from ConnMan): Some DHCP servers will send bigger DHCP packets | |
f21f31b2 | 703 | than the defined default size unless the Maximum Message Size option |
f131770b | 704 | is explicitly set |
324f8187 TG |
705 | |
706 | RFC3442 "Requirements to Avoid Sizing Constraints": | |
707 | Because a full routing table can be quite large, the standard 576 | |
708 | octet maximum size for a DHCP message may be too short to contain | |
709 | some legitimate Classless Static Route options. Because of this, | |
710 | clients implementing the Classless Static Route option SHOULD send a | |
711 | Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP | |
712 | stack is capable of receiving larger IP datagrams. In this case, the | |
713 | client SHOULD set the value of this option to at least the MTU of the | |
714 | interface that the client is configuring. The client MAY set the | |
715 | value of this option higher, up to the size of the largest UDP packet | |
716 | it is prepared to accept. (Note that the value specified in the | |
717 | Maximum DHCP Message Size option is the total maximum packet size, | |
718 | including IP and UDP headers.) | |
50d6810e | 719 | */ |
1b41b815 | 720 | /* RFC7844 section 3: |
721 | SHOULD NOT contain any other option. */ | |
722 | if (!client->anonymize) { | |
723 | max_size = htobe16(size); | |
724 | r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0, | |
725 | SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, | |
726 | 2, &max_size); | |
727 | if (r < 0) | |
728 | return r; | |
729 | } | |
46a66b79 | 730 | |
424a8732 TG |
731 | *_optlen = optlen; |
732 | *_optoffset = optoffset; | |
1cc6c93a | 733 | *ret = TAKE_PTR(packet); |
424a8732 | 734 | |
46a66b79 PF |
735 | return 0; |
736 | } | |
737 | ||
4b558378 ZJS |
738 | static int client_append_fqdn_option( |
739 | DHCPMessage *message, | |
740 | size_t optlen, | |
741 | size_t *optoffset, | |
742 | const char *fqdn) { | |
743 | ||
23873e25 BG |
744 | uint8_t buffer[3 + DHCP_MAX_FQDN_LENGTH]; |
745 | int r; | |
746 | ||
747 | buffer[0] = DHCP_FQDN_FLAG_S | /* Request server to perform A RR DNS updates */ | |
748 | DHCP_FQDN_FLAG_E; /* Canonical wire format */ | |
749 | buffer[1] = 0; /* RCODE1 (deprecated) */ | |
750 | buffer[2] = 0; /* RCODE2 (deprecated) */ | |
751 | ||
3cd03457 | 752 | r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3, false); |
23873e25 BG |
753 | if (r > 0) |
754 | r = dhcp_option_append(message, optlen, optoffset, 0, | |
22805d92 | 755 | SD_DHCP_OPTION_FQDN, 3 + r, buffer); |
23873e25 BG |
756 | |
757 | return r; | |
758 | } | |
759 | ||
4b558378 ZJS |
760 | static int dhcp_client_send_raw( |
761 | sd_dhcp_client *client, | |
762 | DHCPPacket *packet, | |
763 | size_t len) { | |
764 | ||
9faed222 | 765 | dhcp_packet_append_ip_headers(packet, INADDR_ANY, client->port, |
63edaa62 TG |
766 | INADDR_BROADCAST, DHCP_PORT_SERVER, len); |
767 | ||
768 | return dhcp_network_send_raw_socket(client->fd, &client->link, | |
769 | packet, len); | |
770 | } | |
771 | ||
6236f49b | 772 | static int client_send_discover(sd_dhcp_client *client) { |
9f2a50a3 | 773 | _cleanup_free_ DHCPPacket *discover = NULL; |
424a8732 | 774 | size_t optoffset, optlen; |
6236f49b TG |
775 | int r; |
776 | ||
777 | assert(client); | |
4c701096 | 778 | assert(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_SELECTING)); |
50d6810e | 779 | |
424a8732 TG |
780 | r = client_message_init(client, &discover, DHCP_DISCOVER, |
781 | &optlen, &optoffset); | |
6236f49b TG |
782 | if (r < 0) |
783 | return r; | |
46a66b79 | 784 | |
50d6810e TG |
785 | /* the client may suggest values for the network address |
786 | and lease time in the DHCPDISCOVER message. The client may include | |
787 | the ’requested IP address’ option to suggest that a particular IP | |
788 | address be assigned, and may include the ’IP address lease time’ | |
789 | option to suggest the lease time it would like. | |
790 | */ | |
46a66b79 | 791 | if (client->last_addr != INADDR_ANY) { |
04b28be1 | 792 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
22805d92 | 793 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
20b958bf | 794 | 4, &client->last_addr); |
6236f49b TG |
795 | if (r < 0) |
796 | return r; | |
46a66b79 PF |
797 | } |
798 | ||
4cc7a82c | 799 | if (client->hostname) { |
23873e25 BG |
800 | /* According to RFC 4702 "clients that send the Client FQDN option in |
801 | their messages MUST NOT also send the Host Name option". Just send | |
802 | one of the two depending on the hostname type. | |
803 | */ | |
dc477e73 | 804 | if (dns_name_is_single_label(client->hostname)) { |
23873e25 BG |
805 | /* it is unclear from RFC 2131 if client should send hostname in |
806 | DHCPDISCOVER but dhclient does and so we do as well | |
807 | */ | |
808 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
22805d92 | 809 | SD_DHCP_OPTION_HOST_NAME, |
23873e25 BG |
810 | strlen(client->hostname), client->hostname); |
811 | } else | |
812 | r = client_append_fqdn_option(&discover->dhcp, optlen, &optoffset, | |
813 | client->hostname); | |
4cc7a82c EY |
814 | if (r < 0) |
815 | return r; | |
816 | } | |
817 | ||
edb85f0d SS |
818 | if (client->vendor_class_identifier) { |
819 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
22805d92 | 820 | SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, |
edb85f0d SS |
821 | strlen(client->vendor_class_identifier), |
822 | client->vendor_class_identifier); | |
823 | if (r < 0) | |
824 | return r; | |
825 | } | |
826 | ||
af1c0de0 SS |
827 | if (client->user_class) { |
828 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
829 | SD_DHCP_OPTION_USER_CLASS, | |
830 | strv_length(client->user_class), | |
831 | client->user_class); | |
832 | if (r < 0) | |
833 | return r; | |
834 | } | |
835 | ||
04b28be1 | 836 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
22805d92 | 837 | SD_DHCP_OPTION_END, 0, NULL); |
f7926298 TA |
838 | if (r < 0) |
839 | return r; | |
46a66b79 | 840 | |
50d6810e TG |
841 | /* We currently ignore: |
842 | The client SHOULD wait a random time between one and ten seconds to | |
843 | desynchronize the use of DHCP at startup. | |
844 | */ | |
20b958bf | 845 | r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset); |
6236f49b TG |
846 | if (r < 0) |
847 | return r; | |
e2dfc79f | 848 | |
ee57a737 TG |
849 | log_dhcp_client(client, "DISCOVER"); |
850 | ||
63edaa62 | 851 | return 0; |
e2dfc79f PF |
852 | } |
853 | ||
6236f49b | 854 | static int client_send_request(sd_dhcp_client *client) { |
8186d9dd | 855 | _cleanup_free_ DHCPPacket *request = NULL; |
424a8732 | 856 | size_t optoffset, optlen; |
6236f49b | 857 | int r; |
e2dfc79f | 858 | |
a1140666 LP |
859 | assert(client); |
860 | ||
861 | r = client_message_init(client, &request, DHCP_REQUEST, &optlen, &optoffset); | |
6236f49b TG |
862 | if (r < 0) |
863 | return r; | |
46a66b79 | 864 | |
8b1243f7 | 865 | switch (client->state) { |
50d6810e TG |
866 | /* See RFC2131 section 4.3.2 (note that there is a typo in the RFC, |
867 | SELECTING should be REQUESTING) | |
868 | */ | |
869 | ||
870 | case DHCP_STATE_REQUESTING: | |
871 | /* Client inserts the address of the selected server in ’server | |
872 | identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be | |
873 | filled in with the yiaddr value from the chosen DHCPOFFER. | |
874 | */ | |
8b1243f7 | 875 | |
04b28be1 | 876 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 877 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
50d6810e | 878 | 4, &client->lease->server_address); |
6236f49b TG |
879 | if (r < 0) |
880 | return r; | |
8b1243f7 | 881 | |
04b28be1 | 882 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 883 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
6236f49b TG |
884 | 4, &client->lease->address); |
885 | if (r < 0) | |
886 | return r; | |
887 | ||
50d6810e TG |
888 | break; |
889 | ||
890 | case DHCP_STATE_INIT_REBOOT: | |
891 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ | |
892 | option MUST be filled in with client’s notion of its previously | |
893 | assigned address. ’ciaddr’ MUST be zero. | |
894 | */ | |
04b28be1 | 895 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 896 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
50d6810e | 897 | 4, &client->last_addr); |
6236f49b TG |
898 | if (r < 0) |
899 | return r; | |
8b1243f7 PF |
900 | break; |
901 | ||
8b1243f7 | 902 | case DHCP_STATE_RENEWING: |
50d6810e TG |
903 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
904 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
905 | client’s IP address. | |
906 | */ | |
907 | ||
8b1243f7 | 908 | case DHCP_STATE_REBINDING: |
50d6810e TG |
909 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
910 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
911 | client’s IP address. | |
912 | ||
913 | This message MUST be broadcast to the 0xffffffff IP broadcast address. | |
914 | */ | |
915 | request->dhcp.ciaddr = client->lease->address; | |
8b1243f7 PF |
916 | |
917 | break; | |
781ca7a1 | 918 | |
50d6810e TG |
919 | case DHCP_STATE_INIT: |
920 | case DHCP_STATE_SELECTING: | |
921 | case DHCP_STATE_REBOOTING: | |
922 | case DHCP_STATE_BOUND: | |
781ca7a1 PF |
923 | case DHCP_STATE_STOPPED: |
924 | return -EINVAL; | |
e2dfc79f | 925 | } |
46a66b79 | 926 | |
4cc7a82c | 927 | if (client->hostname) { |
dc477e73 | 928 | if (dns_name_is_single_label(client->hostname)) |
23873e25 | 929 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 930 | SD_DHCP_OPTION_HOST_NAME, |
23873e25 BG |
931 | strlen(client->hostname), client->hostname); |
932 | else | |
933 | r = client_append_fqdn_option(&request->dhcp, optlen, &optoffset, | |
934 | client->hostname); | |
4cc7a82c EY |
935 | if (r < 0) |
936 | return r; | |
937 | } | |
938 | ||
5153494f AG |
939 | if (client->vendor_class_identifier) { |
940 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, | |
941 | SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, | |
942 | strlen(client->vendor_class_identifier), | |
943 | client->vendor_class_identifier); | |
944 | if (r < 0) | |
945 | return r; | |
946 | } | |
947 | ||
04b28be1 | 948 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 949 | SD_DHCP_OPTION_END, 0, NULL); |
6236f49b TG |
950 | if (r < 0) |
951 | return r; | |
46a66b79 | 952 | |
aba26854 | 953 | if (client->state == DHCP_STATE_RENEWING) { |
6236f49b TG |
954 | r = dhcp_network_send_udp_socket(client->fd, |
955 | client->lease->server_address, | |
956 | DHCP_PORT_SERVER, | |
957 | &request->dhcp, | |
20b958bf | 958 | sizeof(DHCPMessage) + optoffset); |
aba26854 | 959 | } else { |
20b958bf | 960 | r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset); |
aba26854 | 961 | } |
6236f49b TG |
962 | if (r < 0) |
963 | return r; | |
46a66b79 | 964 | |
998d8047 | 965 | switch (client->state) { |
a1140666 | 966 | |
998d8047 TG |
967 | case DHCP_STATE_REQUESTING: |
968 | log_dhcp_client(client, "REQUEST (requesting)"); | |
969 | break; | |
a1140666 | 970 | |
998d8047 TG |
971 | case DHCP_STATE_INIT_REBOOT: |
972 | log_dhcp_client(client, "REQUEST (init-reboot)"); | |
973 | break; | |
a1140666 | 974 | |
998d8047 TG |
975 | case DHCP_STATE_RENEWING: |
976 | log_dhcp_client(client, "REQUEST (renewing)"); | |
977 | break; | |
a1140666 | 978 | |
998d8047 TG |
979 | case DHCP_STATE_REBINDING: |
980 | log_dhcp_client(client, "REQUEST (rebinding)"); | |
981 | break; | |
a1140666 | 982 | |
998d8047 TG |
983 | default: |
984 | log_dhcp_client(client, "REQUEST (invalid)"); | |
985 | break; | |
986 | } | |
ee57a737 | 987 | |
63edaa62 | 988 | return 0; |
46a66b79 PF |
989 | } |
990 | ||
7739a40b TG |
991 | static int client_start(sd_dhcp_client *client); |
992 | ||
4b558378 ZJS |
993 | static int client_timeout_resend( |
994 | sd_event_source *s, | |
995 | uint64_t usec, | |
996 | void *userdata) { | |
997 | ||
d3d8ac2f | 998 | sd_dhcp_client *client = userdata; |
574cc928 | 999 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 | 1000 | usec_t next_timeout = 0; |
d23c45bf | 1001 | uint64_t time_now; |
aba26854 | 1002 | uint32_t time_left; |
d23c45bf | 1003 | int r; |
b25ef18b TG |
1004 | |
1005 | assert(s); | |
1006 | assert(client); | |
1007 | assert(client->event); | |
d3d8ac2f | 1008 | |
fa94c34b | 1009 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d23c45bf TG |
1010 | if (r < 0) |
1011 | goto error; | |
1012 | ||
aba26854 | 1013 | switch (client->state) { |
a1140666 | 1014 | |
aba26854 PF |
1015 | case DHCP_STATE_RENEWING: |
1016 | ||
e5002702 | 1017 | time_left = (client->lease->t2 - client->lease->t1) / 2; |
aba26854 PF |
1018 | if (time_left < 60) |
1019 | time_left = 60; | |
d3d8ac2f | 1020 | |
d23c45bf | 1021 | next_timeout = time_now + time_left * USEC_PER_SEC; |
d3d8ac2f | 1022 | |
aba26854 PF |
1023 | break; |
1024 | ||
3dd71400 PF |
1025 | case DHCP_STATE_REBINDING: |
1026 | ||
e5002702 | 1027 | time_left = (client->lease->lifetime - client->lease->t2) / 2; |
3dd71400 PF |
1028 | if (time_left < 60) |
1029 | time_left = 60; | |
1030 | ||
d23c45bf | 1031 | next_timeout = time_now + time_left * USEC_PER_SEC; |
3dd71400 PF |
1032 | break; |
1033 | ||
8b1243f7 PF |
1034 | case DHCP_STATE_REBOOTING: |
1035 | /* start over as we did not receive a timely ack or nak */ | |
7739a40b | 1036 | r = client_initialize(client); |
eb105b96 TG |
1037 | if (r < 0) |
1038 | goto error; | |
8b1243f7 | 1039 | |
998d8047 TG |
1040 | r = client_start(client); |
1041 | if (r < 0) | |
1042 | goto error; | |
1043 | else { | |
1044 | log_dhcp_client(client, "REBOOTED"); | |
1045 | return 0; | |
1046 | } | |
7739a40b | 1047 | |
aba26854 PF |
1048 | case DHCP_STATE_INIT: |
1049 | case DHCP_STATE_INIT_REBOOT: | |
aba26854 PF |
1050 | case DHCP_STATE_SELECTING: |
1051 | case DHCP_STATE_REQUESTING: | |
1052 | case DHCP_STATE_BOUND: | |
aba26854 PF |
1053 | |
1054 | if (client->attempt < 64) | |
1055 | client->attempt *= 2; | |
1056 | ||
d23c45bf | 1057 | next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC; |
aba26854 PF |
1058 | |
1059 | break; | |
781ca7a1 PF |
1060 | |
1061 | case DHCP_STATE_STOPPED: | |
1062 | r = -EINVAL; | |
1063 | goto error; | |
aba26854 PF |
1064 | } |
1065 | ||
9bf3b535 | 1066 | next_timeout += (random_u32() & 0x1fffff); |
d3d8ac2f | 1067 | |
a3fa4287 YW |
1068 | r = event_reset_time(client->event, &client->timeout_resend, |
1069 | clock_boottime_or_monotonic(), | |
1070 | next_timeout, 10 * USEC_PER_MSEC, | |
1071 | client_timeout_resend, client, | |
1072 | client->event_priority, "dhcp4-resend-timer", true); | |
9021bb9f TG |
1073 | if (r < 0) |
1074 | goto error; | |
1075 | ||
e2dfc79f PF |
1076 | switch (client->state) { |
1077 | case DHCP_STATE_INIT: | |
6236f49b | 1078 | r = client_send_discover(client); |
b25ef18b | 1079 | if (r >= 0) { |
e2dfc79f PF |
1080 | client->state = DHCP_STATE_SELECTING; |
1081 | client->attempt = 1; | |
1082 | } else { | |
1083 | if (client->attempt >= 64) | |
1084 | goto error; | |
1085 | } | |
1086 | ||
1087 | break; | |
1088 | ||
1089 | case DHCP_STATE_SELECTING: | |
6236f49b | 1090 | r = client_send_discover(client); |
b25ef18b | 1091 | if (r < 0 && client->attempt >= 64) |
d3d8ac2f PF |
1092 | goto error; |
1093 | ||
e2dfc79f PF |
1094 | break; |
1095 | ||
8b1243f7 | 1096 | case DHCP_STATE_INIT_REBOOT: |
e2dfc79f | 1097 | case DHCP_STATE_REQUESTING: |
aba26854 | 1098 | case DHCP_STATE_RENEWING: |
3dd71400 | 1099 | case DHCP_STATE_REBINDING: |
6236f49b | 1100 | r = client_send_request(client); |
b25ef18b | 1101 | if (r < 0 && client->attempt >= 64) |
e2dfc79f | 1102 | goto error; |
d3d8ac2f | 1103 | |
8b1243f7 PF |
1104 | if (client->state == DHCP_STATE_INIT_REBOOT) |
1105 | client->state = DHCP_STATE_REBOOTING; | |
1106 | ||
d23c45bf | 1107 | client->request_sent = time_now; |
51debc1e | 1108 | |
d3d8ac2f PF |
1109 | break; |
1110 | ||
d3d8ac2f | 1111 | case DHCP_STATE_REBOOTING: |
d3d8ac2f | 1112 | case DHCP_STATE_BOUND: |
d3d8ac2f PF |
1113 | |
1114 | break; | |
781ca7a1 PF |
1115 | |
1116 | case DHCP_STATE_STOPPED: | |
1117 | r = -EINVAL; | |
1118 | goto error; | |
d3d8ac2f PF |
1119 | } |
1120 | ||
1121 | return 0; | |
1122 | ||
1123 | error: | |
b25ef18b | 1124 | client_stop(client, r); |
d3d8ac2f PF |
1125 | |
1126 | /* Errors were dealt with when stopping the client, don't spill | |
1127 | errors into the event loop handler */ | |
1128 | return 0; | |
1129 | } | |
1130 | ||
4b558378 ZJS |
1131 | static int client_initialize_io_events( |
1132 | sd_dhcp_client *client, | |
1133 | sd_event_io_handler_t io_callback) { | |
1134 | ||
6a1cd41e PF |
1135 | int r; |
1136 | ||
b25ef18b TG |
1137 | assert(client); |
1138 | assert(client->event); | |
1139 | ||
151b9b96 LP |
1140 | r = sd_event_add_io(client->event, &client->receive_message, |
1141 | client->fd, EPOLLIN, io_callback, | |
1142 | client); | |
6a1cd41e PF |
1143 | if (r < 0) |
1144 | goto error; | |
1145 | ||
e5002702 TG |
1146 | r = sd_event_source_set_priority(client->receive_message, |
1147 | client->event_priority); | |
b25ef18b TG |
1148 | if (r < 0) |
1149 | goto error; | |
1150 | ||
356779df | 1151 | r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message"); |
9021bb9f TG |
1152 | if (r < 0) |
1153 | goto error; | |
1154 | ||
0af03ba5 TG |
1155 | error: |
1156 | if (r < 0) | |
1157 | client_stop(client, r); | |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | static int client_initialize_time_events(sd_dhcp_client *client) { | |
1d1a3e0a | 1163 | uint64_t usec = 0; |
0af03ba5 TG |
1164 | int r; |
1165 | ||
1166 | assert(client); | |
1167 | assert(client->event); | |
1168 | ||
1d1a3e0a | 1169 | if (client->start_delay) { |
8ecdcb55 | 1170 | assert_se(sd_event_now(client->event, clock_boottime_or_monotonic(), &usec) >= 0); |
1d1a3e0a BG |
1171 | usec += client->start_delay; |
1172 | } | |
1173 | ||
a3fa4287 YW |
1174 | r = event_reset_time(client->event, &client->timeout_resend, |
1175 | clock_boottime_or_monotonic(), | |
1176 | usec, 0, | |
1177 | client_timeout_resend, client, | |
1178 | client->event_priority, "dhcp4-resend-timer", true); | |
6a1cd41e PF |
1179 | if (r < 0) |
1180 | client_stop(client, r); | |
1181 | ||
1182 | return 0; | |
1183 | ||
1184 | } | |
1185 | ||
4b558378 | 1186 | static int client_initialize_events(sd_dhcp_client *client, sd_event_io_handler_t io_callback) { |
0af03ba5 TG |
1187 | client_initialize_io_events(client, io_callback); |
1188 | client_initialize_time_events(client); | |
1189 | ||
1190 | return 0; | |
1191 | } | |
1192 | ||
1d1a3e0a | 1193 | static int client_start_delayed(sd_dhcp_client *client) { |
0f941add PF |
1194 | int r; |
1195 | ||
1196 | assert_return(client, -EINVAL); | |
1197 | assert_return(client->event, -EINVAL); | |
2f8e7633 | 1198 | assert_return(client->ifindex > 0, -EINVAL); |
0f941add PF |
1199 | assert_return(client->fd < 0, -EBUSY); |
1200 | assert_return(client->xid == 0, -EINVAL); | |
a1140666 | 1201 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT), -EBUSY); |
0f941add PF |
1202 | |
1203 | client->xid = random_u32(); | |
1204 | ||
2f8e7633 | 1205 | r = dhcp_network_bind_raw_socket(client->ifindex, &client->link, |
76253e73 | 1206 | client->xid, client->mac_addr, |
9faed222 | 1207 | client->mac_addr_len, client->arp_type, client->port); |
0f941add PF |
1208 | if (r < 0) { |
1209 | client_stop(client, r); | |
1210 | return r; | |
1211 | } | |
0f941add | 1212 | client->fd = r; |
58ec2d3e | 1213 | |
3742095b | 1214 | if (IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT)) |
fa94c34b | 1215 | client->start_time = now(clock_boottime_or_monotonic()); |
0f941add | 1216 | |
0f941add PF |
1217 | return client_initialize_events(client, client_receive_message_raw); |
1218 | } | |
1219 | ||
1d1a3e0a BG |
1220 | static int client_start(sd_dhcp_client *client) { |
1221 | client->start_delay = 0; | |
1222 | return client_start_delayed(client); | |
1223 | } | |
1224 | ||
4b558378 | 1225 | static int client_timeout_expire(sd_event_source *s, uint64_t usec, void *userdata) { |
751246ee | 1226 | sd_dhcp_client *client = userdata; |
574cc928 | 1227 | DHCP_CLIENT_DONT_DESTROY(client); |
751246ee | 1228 | |
ee57a737 TG |
1229 | log_dhcp_client(client, "EXPIRED"); |
1230 | ||
03748142 | 1231 | client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); |
0f941add | 1232 | |
781ca7a1 | 1233 | /* lease was lost, start over if not freed or stopped in callback */ |
574cc928 | 1234 | if (client->state != DHCP_STATE_STOPPED) { |
e5b04c8d PF |
1235 | client_initialize(client); |
1236 | client_start(client); | |
1237 | } | |
751246ee | 1238 | |
51debc1e PF |
1239 | return 0; |
1240 | } | |
1241 | ||
5ee482df | 1242 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
3dd71400 | 1243 | sd_dhcp_client *client = userdata; |
574cc928 | 1244 | DHCP_CLIENT_DONT_DESTROY(client); |
3dd71400 PF |
1245 | int r; |
1246 | ||
a1140666 LP |
1247 | assert(client); |
1248 | ||
03e334a1 | 1249 | client->receive_message = sd_event_source_unref(client->receive_message); |
22fc2420 | 1250 | client->fd = asynchronous_close(client->fd); |
3dd71400 PF |
1251 | |
1252 | client->state = DHCP_STATE_REBINDING; | |
1253 | client->attempt = 1; | |
1254 | ||
2f8e7633 | 1255 | r = dhcp_network_bind_raw_socket(client->ifindex, &client->link, |
76253e73 | 1256 | client->xid, client->mac_addr, |
9faed222 SS |
1257 | client->mac_addr_len, client->arp_type, |
1258 | client->port); | |
3dd71400 PF |
1259 | if (r < 0) { |
1260 | client_stop(client, r); | |
1261 | return 0; | |
1262 | } | |
3dd71400 PF |
1263 | client->fd = r; |
1264 | ||
d23c45bf | 1265 | return client_initialize_events(client, client_receive_message_raw); |
51debc1e PF |
1266 | } |
1267 | ||
4b558378 | 1268 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { |
aba26854 | 1269 | sd_dhcp_client *client = userdata; |
574cc928 | 1270 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 PF |
1271 | |
1272 | client->state = DHCP_STATE_RENEWING; | |
1273 | client->attempt = 1; | |
1274 | ||
0af03ba5 | 1275 | return client_initialize_time_events(client); |
51debc1e PF |
1276 | } |
1277 | ||
4b558378 | 1278 | static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, size_t len) { |
4afd3348 | 1279 | _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL; |
5ee482df | 1280 | int r; |
3e3d8f78 | 1281 | |
a6cc569e TG |
1282 | r = dhcp_lease_new(&lease); |
1283 | if (r < 0) | |
1284 | return r; | |
8c00042c | 1285 | |
e37f74a6 DW |
1286 | if (client->client_id_len) { |
1287 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1288 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1289 | client->client_id_len); |
1290 | if (r < 0) | |
1291 | return r; | |
1292 | } | |
1293 | ||
f693e9b3 | 1294 | r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease, NULL); |
9e64dd72 | 1295 | if (r != DHCP_OFFER) { |
6ff8806e | 1296 | log_dhcp_client(client, "received message was not an OFFER, ignoring"); |
5ee482df | 1297 | return -ENOMSG; |
9e64dd72 | 1298 | } |
8c00042c | 1299 | |
8e34a618 | 1300 | lease->next_server = offer->siaddr; |
e5002702 | 1301 | lease->address = offer->yiaddr; |
8c00042c | 1302 | |
0339cd77 LP |
1303 | if (lease->address == 0 || |
1304 | lease->server_address == 0 || | |
9e64dd72 | 1305 | lease->lifetime == 0) { |
0339cd77 | 1306 | log_dhcp_client(client, "received lease lacks address, server address or lease lifetime, ignoring"); |
5ee482df | 1307 | return -ENOMSG; |
9e64dd72 TG |
1308 | } |
1309 | ||
0339cd77 | 1310 | if (!lease->have_subnet_mask) { |
9e64dd72 TG |
1311 | r = dhcp_lease_set_default_subnet_mask(lease); |
1312 | if (r < 0) { | |
87ac8d99 ZJS |
1313 | log_dhcp_client(client, |
1314 | "received lease lacks subnet mask, " | |
1315 | "and a fallback one cannot be generated, ignoring"); | |
9e64dd72 TG |
1316 | return -ENOMSG; |
1317 | } | |
1318 | } | |
8c00042c | 1319 | |
6e00a806 | 1320 | sd_dhcp_lease_unref(client->lease); |
1cc6c93a | 1321 | client->lease = TAKE_PTR(lease); |
8c00042c | 1322 | |
ee57a737 TG |
1323 | log_dhcp_client(client, "OFFER"); |
1324 | ||
8c00042c | 1325 | return 0; |
8c00042c PF |
1326 | } |
1327 | ||
4b558378 | 1328 | static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force, size_t len) { |
615c1467 TG |
1329 | int r; |
1330 | ||
f693e9b3 | 1331 | r = dhcp_option_parse(force, len, NULL, NULL, NULL); |
615c1467 TG |
1332 | if (r != DHCP_FORCERENEW) |
1333 | return -ENOMSG; | |
1334 | ||
1335 | log_dhcp_client(client, "FORCERENEW"); | |
1336 | ||
1337 | return 0; | |
1338 | } | |
1339 | ||
4b558378 | 1340 | static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, size_t len) { |
4afd3348 | 1341 | _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL; |
f693e9b3 | 1342 | _cleanup_free_ char *error_message = NULL; |
5ee482df | 1343 | int r; |
3e3d8f78 | 1344 | |
a6cc569e TG |
1345 | r = dhcp_lease_new(&lease); |
1346 | if (r < 0) | |
1347 | return r; | |
3e3d8f78 | 1348 | |
e37f74a6 DW |
1349 | if (client->client_id_len) { |
1350 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1351 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1352 | client->client_id_len); |
1353 | if (r < 0) | |
1354 | return r; | |
1355 | } | |
1356 | ||
f693e9b3 | 1357 | r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease, &error_message); |
ee57a737 | 1358 | if (r == DHCP_NAK) { |
f693e9b3 | 1359 | log_dhcp_client(client, "NAK: %s", strna(error_message)); |
2d2349cc | 1360 | return -EADDRNOTAVAIL; |
ee57a737 | 1361 | } |
3e3d8f78 | 1362 | |
9e64dd72 | 1363 | if (r != DHCP_ACK) { |
6ff8806e | 1364 | log_dhcp_client(client, "received message was not an ACK, ignoring"); |
5ee482df | 1365 | return -ENOMSG; |
9e64dd72 | 1366 | } |
3e3d8f78 | 1367 | |
8e34a618 TG |
1368 | lease->next_server = ack->siaddr; |
1369 | ||
e5002702 | 1370 | lease->address = ack->yiaddr; |
3e3d8f78 PF |
1371 | |
1372 | if (lease->address == INADDR_ANY || | |
1373 | lease->server_address == INADDR_ANY || | |
9e64dd72 | 1374 | lease->lifetime == 0) { |
6ff8806e | 1375 | log_dhcp_client(client, "received lease lacks address, server " |
9e64dd72 | 1376 | "address or lease lifetime, ignoring"); |
5ee482df | 1377 | return -ENOMSG; |
9e64dd72 TG |
1378 | } |
1379 | ||
1380 | if (lease->subnet_mask == INADDR_ANY) { | |
1381 | r = dhcp_lease_set_default_subnet_mask(lease); | |
1382 | if (r < 0) { | |
87ac8d99 ZJS |
1383 | log_dhcp_client(client, |
1384 | "received lease lacks subnet mask, " | |
1385 | "and a fallback one cannot be generated, ignoring"); | |
9e64dd72 TG |
1386 | return -ENOMSG; |
1387 | } | |
1388 | } | |
3e3d8f78 | 1389 | |
03748142 | 1390 | r = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
3e3d8f78 PF |
1391 | if (client->lease) { |
1392 | if (client->lease->address != lease->address || | |
1393 | client->lease->subnet_mask != lease->subnet_mask || | |
1394 | client->lease->router != lease->router) { | |
03748142 | 1395 | r = SD_DHCP_CLIENT_EVENT_IP_CHANGE; |
68ceb9df | 1396 | } else |
03748142 | 1397 | r = SD_DHCP_CLIENT_EVENT_RENEW; |
3e3d8f78 | 1398 | |
a6cc569e | 1399 | client->lease = sd_dhcp_lease_unref(client->lease); |
3e3d8f78 PF |
1400 | } |
1401 | ||
1cc6c93a | 1402 | client->lease = TAKE_PTR(lease); |
3e3d8f78 | 1403 | |
ee57a737 TG |
1404 | log_dhcp_client(client, "ACK"); |
1405 | ||
3e3d8f78 PF |
1406 | return r; |
1407 | } | |
1408 | ||
fbcd420a | 1409 | static uint64_t client_compute_timeout(sd_dhcp_client *client, uint32_t lifetime, double factor) { |
022446ad TG |
1410 | assert(client); |
1411 | assert(client->request_sent); | |
fbcd420a | 1412 | assert(lifetime > 0); |
022446ad | 1413 | |
fbcd420a LP |
1414 | if (lifetime > 3) |
1415 | lifetime -= 3; | |
1416 | else | |
1417 | lifetime = 0; | |
1418 | ||
1419 | return client->request_sent + (lifetime * USEC_PER_SEC * factor) + | |
9bf3b535 | 1420 | + (random_u32() & 0x1fffff); |
51debc1e PF |
1421 | } |
1422 | ||
022446ad TG |
1423 | static int client_set_lease_timeouts(sd_dhcp_client *client) { |
1424 | usec_t time_now; | |
1425 | uint64_t lifetime_timeout; | |
1426 | uint64_t t2_timeout; | |
1427 | uint64_t t1_timeout; | |
1428 | char time_string[FORMAT_TIMESPAN_MAX]; | |
5ee482df | 1429 | int r; |
51debc1e | 1430 | |
b25ef18b TG |
1431 | assert(client); |
1432 | assert(client->event); | |
022446ad TG |
1433 | assert(client->lease); |
1434 | assert(client->lease->lifetime); | |
51debc1e | 1435 | |
022446ad | 1436 | /* don't set timers for infinite leases */ |
a3fa4287 YW |
1437 | if (client->lease->lifetime == 0xffffffff) { |
1438 | (void) event_source_disable(client->timeout_t1); | |
1439 | (void) event_source_disable(client->timeout_t2); | |
1440 | (void) event_source_disable(client->timeout_expire); | |
1441 | ||
022446ad | 1442 | return 0; |
a3fa4287 | 1443 | } |
51debc1e | 1444 | |
fa94c34b | 1445 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
022446ad TG |
1446 | if (r < 0) |
1447 | return r; | |
1448 | assert(client->request_sent <= time_now); | |
1449 | ||
1450 | /* convert the various timeouts from relative (secs) to absolute (usecs) */ | |
1451 | lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1); | |
fbcd420a | 1452 | if (client->lease->t1 > 0 && client->lease->t2 > 0) { |
022446ad TG |
1453 | /* both T1 and T2 are given */ |
1454 | if (client->lease->t1 < client->lease->t2 && | |
1455 | client->lease->t2 < client->lease->lifetime) { | |
1456 | /* they are both valid */ | |
1457 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1458 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1459 | } else { | |
1460 | /* discard both */ | |
1461 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1462 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1463 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1464 | client->lease->t1 = client->lease->lifetime / 2; | |
1465 | } | |
fbcd420a | 1466 | } else if (client->lease->t2 > 0 && client->lease->t2 < client->lease->lifetime) { |
022446ad TG |
1467 | /* only T2 is given, and it is valid */ |
1468 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1469 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1470 | client->lease->t1 = client->lease->lifetime / 2; | |
1471 | if (t2_timeout <= t1_timeout) { | |
1472 | /* the computed T1 would be invalid, so discard T2 */ | |
1473 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1474 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1475 | } | |
fbcd420a | 1476 | } else if (client->lease->t1 > 0 && client->lease->t1 < client->lease->lifetime) { |
022446ad TG |
1477 | /* only T1 is given, and it is valid */ |
1478 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1479 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1480 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1481 | if (t2_timeout <= t1_timeout) { | |
1482 | /* the computed T2 would be invalid, so discard T1 */ | |
1483 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1484 | client->lease->t2 = client->lease->lifetime / 2; | |
1485 | } | |
1486 | } else { | |
1487 | /* fall back to the default timeouts */ | |
1488 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1489 | client->lease->t1 = client->lease->lifetime / 2; | |
1490 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1491 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1492 | } | |
51debc1e | 1493 | |
022446ad | 1494 | /* arm lifetime timeout */ |
a3fa4287 YW |
1495 | r = event_reset_time(client->event, &client->timeout_expire, |
1496 | clock_boottime_or_monotonic(), | |
1497 | lifetime_timeout, 10 * USEC_PER_MSEC, | |
1498 | client_timeout_expire, client, | |
1499 | client->event_priority, "dhcp4-lifetime", true); | |
9021bb9f TG |
1500 | if (r < 0) |
1501 | return r; | |
1502 | ||
022446ad | 1503 | log_dhcp_client(client, "lease expires in %s", |
ed19c567 | 1504 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_timeout - time_now, USEC_PER_SEC)); |
51debc1e | 1505 | |
022446ad TG |
1506 | /* don't arm earlier timeouts if this has already expired */ |
1507 | if (lifetime_timeout <= time_now) | |
1508 | return 0; | |
51debc1e | 1509 | |
022446ad | 1510 | /* arm T2 timeout */ |
a3fa4287 YW |
1511 | r = event_reset_time(client->event, &client->timeout_t2, |
1512 | clock_boottime_or_monotonic(), | |
1513 | t2_timeout, 10 * USEC_PER_MSEC, | |
1514 | client_timeout_t2, client, | |
1515 | client->event_priority, "dhcp4-t2-timeout", true); | |
9021bb9f TG |
1516 | if (r < 0) |
1517 | return r; | |
1518 | ||
022446ad | 1519 | log_dhcp_client(client, "T2 expires in %s", |
ed19c567 | 1520 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t2_timeout - time_now, USEC_PER_SEC)); |
022446ad TG |
1521 | |
1522 | /* don't arm earlier timeout if this has already expired */ | |
1523 | if (t2_timeout <= time_now) | |
1524 | return 0; | |
51debc1e | 1525 | |
022446ad | 1526 | /* arm T1 timeout */ |
a3fa4287 YW |
1527 | r = event_reset_time(client->event, &client->timeout_t1, |
1528 | clock_boottime_or_monotonic(), | |
1529 | t1_timeout, 10 * USEC_PER_MSEC, | |
1530 | client_timeout_t1, client, | |
1531 | client->event_priority, "dhcp4-t1-timer", true); | |
9021bb9f TG |
1532 | if (r < 0) |
1533 | return r; | |
1534 | ||
022446ad | 1535 | log_dhcp_client(client, "T1 expires in %s", |
ed19c567 | 1536 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t1_timeout - time_now, USEC_PER_SEC)); |
022446ad | 1537 | |
51debc1e PF |
1538 | return 0; |
1539 | } | |
1540 | ||
4b558378 | 1541 | static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, int len) { |
574cc928 | 1542 | DHCP_CLIENT_DONT_DESTROY(client); |
1d1a3e0a | 1543 | char time_string[FORMAT_TIMESPAN_MAX]; |
e5002702 | 1544 | int r = 0, notify_event = 0; |
8c00042c | 1545 | |
b25ef18b TG |
1546 | assert(client); |
1547 | assert(client->event); | |
e5002702 | 1548 | assert(message); |
b25ef18b | 1549 | |
8c00042c PF |
1550 | switch (client->state) { |
1551 | case DHCP_STATE_SELECTING: | |
1552 | ||
e5002702 TG |
1553 | r = client_handle_offer(client, message, len); |
1554 | if (r >= 0) { | |
8c00042c | 1555 | |
8c00042c | 1556 | client->state = DHCP_STATE_REQUESTING; |
e2dfc79f PF |
1557 | client->attempt = 1; |
1558 | ||
a3fa4287 YW |
1559 | r = event_reset_time(client->event, &client->timeout_resend, |
1560 | clock_boottime_or_monotonic(), | |
1561 | 0, 0, | |
1562 | client_timeout_resend, client, | |
1563 | client->event_priority, "dhcp4-resend-timer", true); | |
9021bb9f TG |
1564 | if (r < 0) |
1565 | goto error; | |
9e64dd72 TG |
1566 | } else if (r == -ENOMSG) |
1567 | /* invalid message, let's ignore it */ | |
1568 | return 0; | |
8c00042c PF |
1569 | |
1570 | break; | |
1571 | ||
8b1243f7 | 1572 | case DHCP_STATE_REBOOTING: |
3e3d8f78 | 1573 | case DHCP_STATE_REQUESTING: |
aba26854 | 1574 | case DHCP_STATE_RENEWING: |
3dd71400 | 1575 | case DHCP_STATE_REBINDING: |
aba26854 | 1576 | |
e5002702 | 1577 | r = client_handle_ack(client, message, len); |
2d2349cc | 1578 | if (r >= 0) { |
1d1a3e0a | 1579 | client->start_delay = 0; |
a3fa4287 | 1580 | (void) event_source_disable(client->timeout_resend); |
affaa94f DW |
1581 | client->receive_message = |
1582 | sd_event_source_unref(client->receive_message); | |
1583 | client->fd = asynchronous_close(client->fd); | |
3e3d8f78 | 1584 | |
8b1243f7 PF |
1585 | if (IN_SET(client->state, DHCP_STATE_REQUESTING, |
1586 | DHCP_STATE_REBOOTING)) | |
03748142 DH |
1587 | notify_event = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
1588 | else if (r != SD_DHCP_CLIENT_EVENT_IP_ACQUIRE) | |
aba26854 PF |
1589 | notify_event = r; |
1590 | ||
3e3d8f78 PF |
1591 | client->state = DHCP_STATE_BOUND; |
1592 | client->attempt = 1; | |
1593 | ||
1594 | client->last_addr = client->lease->address; | |
1595 | ||
022446ad | 1596 | r = client_set_lease_timeouts(client); |
0411760a TG |
1597 | if (r < 0) { |
1598 | log_dhcp_client(client, "could not set lease timeouts"); | |
51debc1e | 1599 | goto error; |
0411760a | 1600 | } |
51debc1e | 1601 | |
3e7b9f76 | 1602 | r = dhcp_network_bind_udp_socket(client->ifindex, client->lease->address, client->port); |
0af03ba5 TG |
1603 | if (r < 0) { |
1604 | log_dhcp_client(client, "could not bind UDP socket"); | |
1605 | goto error; | |
1606 | } | |
1607 | ||
1608 | client->fd = r; | |
1609 | ||
1610 | client_initialize_io_events(client, client_receive_message_udp); | |
1611 | ||
e5b04c8d | 1612 | if (notify_event) { |
574cc928 TG |
1613 | client_notify(client, notify_event); |
1614 | if (client->state == DHCP_STATE_STOPPED) | |
e5b04c8d PF |
1615 | return 0; |
1616 | } | |
3e3d8f78 | 1617 | |
2d2349cc TG |
1618 | } else if (r == -EADDRNOTAVAIL) { |
1619 | /* got a NAK, let's restart the client */ | |
cc3981b1 LS |
1620 | client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); |
1621 | ||
2d2349cc TG |
1622 | r = client_initialize(client); |
1623 | if (r < 0) | |
1624 | goto error; | |
1625 | ||
1d1a3e0a | 1626 | r = client_start_delayed(client); |
2d2349cc TG |
1627 | if (r < 0) |
1628 | goto error; | |
1629 | ||
1d1a3e0a BG |
1630 | log_dhcp_client(client, "REBOOT in %s", format_timespan(time_string, FORMAT_TIMESPAN_MAX, |
1631 | client->start_delay, USEC_PER_SEC)); | |
1632 | ||
1633 | client->start_delay = CLAMP(client->start_delay * 2, | |
1634 | RESTART_AFTER_NAK_MIN_USEC, RESTART_AFTER_NAK_MAX_USEC); | |
2d2349cc TG |
1635 | |
1636 | return 0; | |
9e64dd72 TG |
1637 | } else if (r == -ENOMSG) |
1638 | /* invalid message, let's ignore it */ | |
1639 | return 0; | |
97b9372d | 1640 | |
3e3d8f78 PF |
1641 | break; |
1642 | ||
615c1467 TG |
1643 | case DHCP_STATE_BOUND: |
1644 | r = client_handle_forcerenew(client, message, len); | |
1645 | if (r >= 0) { | |
1646 | r = client_timeout_t1(NULL, 0, client); | |
1647 | if (r < 0) | |
1648 | goto error; | |
1649 | } else if (r == -ENOMSG) | |
1650 | /* invalid message, let's ignore it */ | |
1651 | return 0; | |
1652 | ||
1653 | break; | |
1654 | ||
8c00042c PF |
1655 | case DHCP_STATE_INIT: |
1656 | case DHCP_STATE_INIT_REBOOT: | |
8c00042c PF |
1657 | |
1658 | break; | |
781ca7a1 PF |
1659 | |
1660 | case DHCP_STATE_STOPPED: | |
1661 | r = -EINVAL; | |
1662 | goto error; | |
8c00042c PF |
1663 | } |
1664 | ||
1665 | error: | |
2d2349cc | 1666 | if (r < 0) |
e5b04c8d | 1667 | client_stop(client, r); |
e2dfc79f | 1668 | |
e5b04c8d | 1669 | return r; |
8c00042c PF |
1670 | } |
1671 | ||
4b558378 ZJS |
1672 | static int client_receive_message_udp( |
1673 | sd_event_source *s, | |
1674 | int fd, | |
1675 | uint32_t revents, | |
1676 | void *userdata) { | |
1677 | ||
e5002702 | 1678 | sd_dhcp_client *client = userdata; |
5266a81e | 1679 | _cleanup_free_ DHCPMessage *message = NULL; |
16f0b479 | 1680 | const struct ether_addr zero_mac = {}; |
3dc05554 | 1681 | const struct ether_addr *expected_chaddr = NULL; |
76253e73 | 1682 | uint8_t expected_hlen = 0; |
4edc2c9b | 1683 | ssize_t len, buflen; |
e5002702 TG |
1684 | |
1685 | assert(s); | |
1686 | assert(client); | |
e5002702 | 1687 | |
4edc2c9b LP |
1688 | buflen = next_datagram_size_fd(fd); |
1689 | if (buflen < 0) | |
1690 | return buflen; | |
5266a81e TG |
1691 | |
1692 | message = malloc0(buflen); | |
1693 | if (!message) | |
1694 | return -ENOMEM; | |
1695 | ||
cf447cb6 | 1696 | len = recv(fd, message, buflen, 0); |
0c79c68d | 1697 | if (len < 0) { |
4c701096 | 1698 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
1699 | return 0; |
1700 | ||
25f027c5 ZJS |
1701 | return log_dhcp_client_errno(client, errno, |
1702 | "Could not receive message from UDP socket: %m"); | |
004845d1 LP |
1703 | } |
1704 | if ((size_t) len < sizeof(DHCPMessage)) { | |
0d43d2fc | 1705 | log_dhcp_client(client, "Too small to be a DHCP message: ignoring"); |
e5002702 | 1706 | return 0; |
9fbc2523 TG |
1707 | } |
1708 | ||
1709 | if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) { | |
0d43d2fc | 1710 | log_dhcp_client(client, "Not a DHCP message: ignoring"); |
9fbc2523 TG |
1711 | return 0; |
1712 | } | |
1713 | ||
1714 | if (message->op != BOOTREPLY) { | |
0d43d2fc | 1715 | log_dhcp_client(client, "Not a BOOTREPLY message: ignoring"); |
9fbc2523 TG |
1716 | return 0; |
1717 | } | |
1718 | ||
76253e73 | 1719 | if (message->htype != client->arp_type) { |
0d43d2fc | 1720 | log_dhcp_client(client, "Packet type does not match client type"); |
76253e73 DW |
1721 | return 0; |
1722 | } | |
1723 | ||
1724 | if (client->arp_type == ARPHRD_ETHER) { | |
1725 | expected_hlen = ETH_ALEN; | |
3dc05554 | 1726 | expected_chaddr = (const struct ether_addr *) &client->mac_addr; |
76253e73 | 1727 | } else { |
a8eaaee7 | 1728 | /* Non-Ethernet links expect zero chaddr */ |
76253e73 | 1729 | expected_hlen = 0; |
3dc05554 | 1730 | expected_chaddr = &zero_mac; |
76253e73 DW |
1731 | } |
1732 | ||
1733 | if (message->hlen != expected_hlen) { | |
0d43d2fc | 1734 | log_dhcp_client(client, "Unexpected packet hlen %d", message->hlen); |
9fbc2523 TG |
1735 | return 0; |
1736 | } | |
1737 | ||
3dc05554 | 1738 | if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) { |
0d43d2fc | 1739 | log_dhcp_client(client, "Received chaddr does not match expected: ignoring"); |
9fbc2523 TG |
1740 | return 0; |
1741 | } | |
e5002702 | 1742 | |
615c1467 TG |
1743 | if (client->state != DHCP_STATE_BOUND && |
1744 | be32toh(message->xid) != client->xid) { | |
1745 | /* in BOUND state, we may receive FORCERENEW with xid set by server, | |
1746 | so ignore the xid in this case */ | |
0d43d2fc | 1747 | log_dhcp_client(client, "Received xid (%u) does not match expected (%u): ignoring", |
615c1467 TG |
1748 | be32toh(message->xid), client->xid); |
1749 | return 0; | |
1750 | } | |
1751 | ||
022446ad | 1752 | return client_handle_message(client, message, len); |
e5002702 TG |
1753 | } |
1754 | ||
4b558378 ZJS |
1755 | static int client_receive_message_raw( |
1756 | sd_event_source *s, | |
1757 | int fd, | |
1758 | uint32_t revents, | |
1759 | void *userdata) { | |
1760 | ||
e5002702 | 1761 | sd_dhcp_client *client = userdata; |
5266a81e | 1762 | _cleanup_free_ DHCPPacket *packet = NULL; |
55dab2ed TG |
1763 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; |
1764 | struct iovec iov = {}; | |
1765 | struct msghdr msg = { | |
1766 | .msg_iov = &iov, | |
1767 | .msg_iovlen = 1, | |
1768 | .msg_control = cmsgbuf, | |
1769 | .msg_controllen = sizeof(cmsgbuf), | |
1770 | }; | |
1771 | struct cmsghdr *cmsg; | |
1772 | bool checksum = true; | |
4edc2c9b LP |
1773 | ssize_t buflen, len; |
1774 | int r; | |
e5002702 TG |
1775 | |
1776 | assert(s); | |
1777 | assert(client); | |
e5002702 | 1778 | |
4edc2c9b LP |
1779 | buflen = next_datagram_size_fd(fd); |
1780 | if (buflen < 0) | |
1781 | return buflen; | |
5266a81e TG |
1782 | |
1783 | packet = malloc0(buflen); | |
1784 | if (!packet) | |
1785 | return -ENOMEM; | |
1786 | ||
55dab2ed TG |
1787 | iov.iov_base = packet; |
1788 | iov.iov_len = buflen; | |
1789 | ||
a38d9945 | 1790 | len = recvmsg(fd, &msg, 0); |
55dab2ed | 1791 | if (len < 0) { |
4c701096 | 1792 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
1793 | return 0; |
1794 | ||
25f027c5 ZJS |
1795 | return log_dhcp_client_errno(client, errno, |
1796 | "Could not receive message from raw socket: %m"); | |
0c79c68d TG |
1797 | } else if ((size_t)len < sizeof(DHCPPacket)) |
1798 | return 0; | |
55dab2ed | 1799 | |
2a1288ff | 1800 | CMSG_FOREACH(cmsg, &msg) { |
48a4612e TG |
1801 | if (cmsg->cmsg_level == SOL_PACKET && |
1802 | cmsg->cmsg_type == PACKET_AUXDATA && | |
1803 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) { | |
1804 | struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg); | |
55dab2ed TG |
1805 | |
1806 | checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY); | |
1807 | break; | |
1808 | } | |
1809 | } | |
e5002702 | 1810 | |
9faed222 | 1811 | r = dhcp_packet_verify_headers(packet, len, checksum, client->port); |
ac4f16ab | 1812 | if (r < 0) |
9fadd4ca | 1813 | return 0; |
e5002702 TG |
1814 | |
1815 | len -= DHCP_IP_UDP_SIZE; | |
1816 | ||
022446ad | 1817 | return client_handle_message(client, &packet->dhcp, len); |
e5002702 TG |
1818 | } |
1819 | ||
5ee482df | 1820 | int sd_dhcp_client_start(sd_dhcp_client *client) { |
6a1cd41e | 1821 | int r; |
d3d8ac2f | 1822 | |
46a66b79 | 1823 | assert_return(client, -EINVAL); |
46a66b79 | 1824 | |
0f941add PF |
1825 | r = client_initialize(client); |
1826 | if (r < 0) | |
6a1cd41e | 1827 | return r; |
8c00042c | 1828 | |
66173db7 | 1829 | /* RFC7844 section 3.3: |
1830 | SHOULD perform a complete four-way handshake, starting with a | |
1831 | DHCPDISCOVER, to obtain a new address lease. If the client can | |
1832 | ascertain that this is exactly the same network to which it was | |
1833 | previously connected, and if the link-layer address did not change, | |
1834 | the client MAY issue a DHCPREQUEST to try to reclaim the current | |
1835 | address. */ | |
1836 | if (client->last_addr && !client->anonymize) | |
0f941add | 1837 | client->state = DHCP_STATE_INIT_REBOOT; |
d3d8ac2f | 1838 | |
998d8047 TG |
1839 | r = client_start(client); |
1840 | if (r >= 0) | |
2f8e7633 | 1841 | log_dhcp_client(client, "STARTED on ifindex %i", client->ifindex); |
998d8047 TG |
1842 | |
1843 | return r; | |
46a66b79 PF |
1844 | } |
1845 | ||
5ee482df | 1846 | int sd_dhcp_client_stop(sd_dhcp_client *client) { |
574cc928 TG |
1847 | DHCP_CLIENT_DONT_DESTROY(client); |
1848 | ||
e5b04c8d PF |
1849 | assert_return(client, -EINVAL); |
1850 | ||
03748142 | 1851 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
574cc928 | 1852 | client->state = DHCP_STATE_STOPPED; |
e5b04c8d PF |
1853 | |
1854 | return 0; | |
bbdf06d9 PF |
1855 | } |
1856 | ||
32d20645 | 1857 | int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int64_t priority) { |
b25ef18b TG |
1858 | int r; |
1859 | ||
1860 | assert_return(client, -EINVAL); | |
1861 | assert_return(!client->event, -EBUSY); | |
1862 | ||
1863 | if (event) | |
1864 | client->event = sd_event_ref(event); | |
1865 | else { | |
1866 | r = sd_event_default(&client->event); | |
1867 | if (r < 0) | |
1868 | return 0; | |
1869 | } | |
1870 | ||
1871 | client->event_priority = priority; | |
1872 | ||
1873 | return 0; | |
1874 | } | |
1875 | ||
1876 | int sd_dhcp_client_detach_event(sd_dhcp_client *client) { | |
1877 | assert_return(client, -EINVAL); | |
1878 | ||
1879 | client->event = sd_event_unref(client->event); | |
1880 | ||
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { | |
a1140666 | 1885 | assert_return(client, NULL); |
b25ef18b TG |
1886 | |
1887 | return client->event; | |
1888 | } | |
1889 | ||
8301aa0b YW |
1890 | static sd_dhcp_client *dhcp_client_free(sd_dhcp_client *client) { |
1891 | assert(client); | |
e5b04c8d | 1892 | |
3733eec3 | 1893 | log_dhcp_client(client, "FREE"); |
6e00a806 | 1894 | |
a3fa4287 YW |
1895 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
1896 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); | |
1897 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
1898 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
3733eec3 | 1899 | |
a3fa4287 | 1900 | client_initialize(client); |
3733eec3 LP |
1901 | |
1902 | sd_dhcp_client_detach_event(client); | |
1903 | ||
1904 | sd_dhcp_lease_unref(client->lease); | |
1905 | ||
1906 | free(client->req_opts); | |
1907 | free(client->hostname); | |
1908 | free(client->vendor_class_identifier); | |
af1c0de0 | 1909 | client->user_class = strv_free(client->user_class); |
6b430fdb | 1910 | return mfree(client); |
d2fe46b5 PF |
1911 | } |
1912 | ||
8301aa0b YW |
1913 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_client, sd_dhcp_client, dhcp_client_free); |
1914 | ||
db3d2358 | 1915 | int sd_dhcp_client_new(sd_dhcp_client **ret, int anonymize) { |
4afd3348 | 1916 | _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = NULL; |
011feef8 | 1917 | |
b25ef18b | 1918 | assert_return(ret, -EINVAL); |
d3d8ac2f | 1919 | |
be6bf4a7 | 1920 | client = new(sd_dhcp_client, 1); |
011feef8 | 1921 | if (!client) |
b25ef18b | 1922 | return -ENOMEM; |
011feef8 | 1923 | |
be6bf4a7 YW |
1924 | *client = (sd_dhcp_client) { |
1925 | .n_ref = 1, | |
1926 | .state = DHCP_STATE_INIT, | |
1927 | .ifindex = -1, | |
1928 | .fd = -1, | |
1929 | .attempt = 1, | |
1930 | .mtu = DHCP_DEFAULT_MIN_SIZE, | |
1931 | .port = DHCP_PORT_CLIENT, | |
1932 | .anonymize = !!anonymize, | |
1933 | }; | |
db3d2358 | 1934 | /* NOTE: this could be moved to a function. */ |
1935 | if (anonymize) { | |
1936 | client->req_opts_size = ELEMENTSOF(default_req_opts_anonymize); | |
1937 | client->req_opts = memdup(default_req_opts_anonymize, client->req_opts_size); | |
1938 | } else { | |
1939 | client->req_opts_size = ELEMENTSOF(default_req_opts); | |
1940 | client->req_opts = memdup(default_req_opts, client->req_opts_size); | |
1941 | } | |
b25ef18b TG |
1942 | if (!client->req_opts) |
1943 | return -ENOMEM; | |
1944 | ||
1cc6c93a | 1945 | *ret = TAKE_PTR(client); |
011feef8 | 1946 | |
b25ef18b | 1947 | return 0; |
011feef8 | 1948 | } |