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Commit | Line | Data |
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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" |
cb310866 | 26 | #include "io-util.h" |
0a970718 | 27 | #include "memory-util.h" |
07630cea LP |
28 | #include "random-util.h" |
29 | #include "string-util.h" | |
af1c0de0 | 30 | #include "strv.h" |
011feef8 | 31 | |
5bac5235 | 32 | #define MAX_CLIENT_ID_LEN (sizeof(uint32_t) + MAX_DUID_LEN) /* Arbitrary limit */ |
dd168445 | 33 | #define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN) |
76253e73 | 34 | |
1d1a3e0a BG |
35 | #define RESTART_AFTER_NAK_MIN_USEC (1 * USEC_PER_SEC) |
36 | #define RESTART_AFTER_NAK_MAX_USEC (30 * USEC_PER_MINUTE) | |
37 | ||
cb29c156 SS |
38 | struct sd_dhcp_option { |
39 | unsigned n_ref; | |
40 | ||
41 | uint8_t option; | |
42 | void *data; | |
43 | size_t length; | |
44 | }; | |
45 | ||
011feef8 | 46 | struct sd_dhcp_client { |
3733eec3 | 47 | unsigned n_ref; |
e5b04c8d | 48 | |
011feef8 | 49 | DHCPState state; |
d3d8ac2f | 50 | sd_event *event; |
b25ef18b | 51 | int event_priority; |
d3d8ac2f | 52 | sd_event_source *timeout_resend; |
2f8e7633 | 53 | int ifindex; |
8c00042c | 54 | int fd; |
9faed222 | 55 | uint16_t port; |
8c00042c PF |
56 | union sockaddr_union link; |
57 | sd_event_source *receive_message; | |
f5de5b00 | 58 | bool request_broadcast; |
011feef8 | 59 | uint8_t *req_opts; |
7a7c74ca | 60 | size_t req_opts_allocated; |
011feef8 | 61 | size_t req_opts_size; |
db3d2358 | 62 | bool anonymize; |
3b349af6 | 63 | be32_t last_addr; |
76253e73 DW |
64 | uint8_t mac_addr[MAX_MAC_ADDR_LEN]; |
65 | size_t mac_addr_len; | |
66 | uint16_t arp_type; | |
5bac5235 TG |
67 | struct { |
68 | uint8_t type; | |
69 | union { | |
70 | struct { | |
71 | /* 0: Generic (non-LL) (RFC 2132) */ | |
72 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
73 | } _packed_ gen; | |
74 | struct { | |
75 | /* 1: Ethernet Link-Layer (RFC 2132) */ | |
76 | uint8_t haddr[ETH_ALEN]; | |
77 | } _packed_ eth; | |
78 | struct { | |
79 | /* 2 - 254: ARP/Link-Layer (RFC 2132) */ | |
80 | uint8_t haddr[0]; | |
81 | } _packed_ ll; | |
82 | struct { | |
83 | /* 255: Node-specific (RFC 4361) */ | |
413708d1 | 84 | be32_t iaid; |
5bac5235 TG |
85 | struct duid duid; |
86 | } _packed_ ns; | |
87 | struct { | |
88 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
89 | } _packed_ raw; | |
90 | }; | |
91 | } _packed_ client_id; | |
ba6c0fd6 | 92 | size_t client_id_len; |
4cc7a82c | 93 | char *hostname; |
edb85f0d | 94 | char *vendor_class_identifier; |
af1c0de0 | 95 | char **user_class; |
324f8187 | 96 | uint32_t mtu; |
46a66b79 | 97 | uint32_t xid; |
d3d8ac2f | 98 | usec_t start_time; |
715cedfb SS |
99 | uint64_t attempt; |
100 | uint64_t max_attempts; | |
cb29c156 | 101 | OrderedHashmap *options; |
51debc1e PF |
102 | usec_t request_sent; |
103 | sd_event_source *timeout_t1; | |
104 | sd_event_source *timeout_t2; | |
105 | sd_event_source *timeout_expire; | |
45aa74c7 | 106 | sd_dhcp_client_callback_t callback; |
751246ee | 107 | void *userdata; |
a6cc569e | 108 | sd_dhcp_lease *lease; |
1d1a3e0a | 109 | usec_t start_delay; |
afe42aef | 110 | int ip_service_type; |
011feef8 PF |
111 | }; |
112 | ||
113 | static const uint8_t default_req_opts[] = { | |
22805d92 BG |
114 | SD_DHCP_OPTION_SUBNET_MASK, |
115 | SD_DHCP_OPTION_ROUTER, | |
116 | SD_DHCP_OPTION_HOST_NAME, | |
117 | SD_DHCP_OPTION_DOMAIN_NAME, | |
118 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, | |
011feef8 PF |
119 | }; |
120 | ||
db3d2358 | 121 | /* RFC7844 section 3: |
122 | MAY contain the Parameter Request List option. | |
123 | RFC7844 section 3.6: | |
124 | The client intending to protect its privacy SHOULD only request a | |
125 | minimal number of options in the PRL and SHOULD also randomly shuffle | |
126 | the ordering of option codes in the PRL. If this random ordering | |
127 | cannot be implemented, the client MAY order the option codes in the | |
128 | PRL by option code number (lowest to highest). | |
129 | */ | |
130 | /* NOTE: using PRL options that Windows 10 RFC7844 implementation uses */ | |
131 | static const uint8_t default_req_opts_anonymize[] = { | |
75924885 YW |
132 | SD_DHCP_OPTION_SUBNET_MASK, /* 1 */ |
133 | SD_DHCP_OPTION_ROUTER, /* 3 */ | |
134 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, /* 6 */ | |
135 | SD_DHCP_OPTION_DOMAIN_NAME, /* 15 */ | |
136 | SD_DHCP_OPTION_ROUTER_DISCOVER, /* 31 */ | |
137 | SD_DHCP_OPTION_STATIC_ROUTE, /* 33 */ | |
138 | SD_DHCP_OPTION_VENDOR_SPECIFIC, /* 43 */ | |
139 | SD_DHCP_OPTION_NETBIOS_NAMESERVER, /* 44 */ | |
140 | SD_DHCP_OPTION_NETBIOS_NODETYPE, /* 46 */ | |
141 | SD_DHCP_OPTION_NETBIOS_SCOPE, /* 47 */ | |
142 | SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE, /* 121 */ | |
143 | SD_DHCP_OPTION_PRIVATE_CLASSLESS_STATIC_ROUTE, /* 249 */ | |
144 | SD_DHCP_OPTION_PRIVATE_PROXY_AUTODISCOVERY, /* 252 */ | |
db3d2358 | 145 | }; |
146 | ||
4b558378 ZJS |
147 | static int client_receive_message_raw( |
148 | sd_event_source *s, | |
149 | int fd, | |
150 | uint32_t revents, | |
151 | void *userdata); | |
152 | static int client_receive_message_udp( | |
153 | sd_event_source *s, | |
154 | int fd, | |
155 | uint32_t revents, | |
156 | void *userdata); | |
574cc928 | 157 | static void client_stop(sd_dhcp_client *client, int error); |
aba26854 | 158 | |
4b558378 ZJS |
159 | int sd_dhcp_client_set_callback( |
160 | sd_dhcp_client *client, | |
161 | sd_dhcp_client_callback_t cb, | |
162 | void *userdata) { | |
45aa74c7 | 163 | |
751246ee PF |
164 | assert_return(client, -EINVAL); |
165 | ||
45aa74c7 | 166 | client->callback = cb; |
751246ee PF |
167 | client->userdata = userdata; |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
f5de5b00 TG |
172 | int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) { |
173 | assert_return(client, -EINVAL); | |
174 | ||
175 | client->request_broadcast = !!broadcast; | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
5ee482df | 180 | int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) { |
011feef8 PF |
181 | size_t i; |
182 | ||
183 | assert_return(client, -EINVAL); | |
a1140666 | 184 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); |
011feef8 PF |
185 | |
186 | switch(option) { | |
a1140666 | 187 | |
22805d92 BG |
188 | case SD_DHCP_OPTION_PAD: |
189 | case SD_DHCP_OPTION_OVERLOAD: | |
190 | case SD_DHCP_OPTION_MESSAGE_TYPE: | |
191 | case SD_DHCP_OPTION_PARAMETER_REQUEST_LIST: | |
192 | case SD_DHCP_OPTION_END: | |
011feef8 PF |
193 | return -EINVAL; |
194 | ||
195 | default: | |
196 | break; | |
197 | } | |
198 | ||
199 | for (i = 0; i < client->req_opts_size; i++) | |
200 | if (client->req_opts[i] == option) | |
201 | return -EEXIST; | |
202 | ||
7a7c74ca | 203 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, |
011feef8 PF |
204 | client->req_opts_size + 1)) |
205 | return -ENOMEM; | |
206 | ||
7a7c74ca | 207 | client->req_opts[client->req_opts_size++] = option; |
011feef8 PF |
208 | |
209 | return 0; | |
210 | } | |
211 | ||
4b558378 ZJS |
212 | int sd_dhcp_client_set_request_address( |
213 | sd_dhcp_client *client, | |
214 | const struct in_addr *last_addr) { | |
a1140666 | 215 | |
011feef8 | 216 | assert_return(client, -EINVAL); |
a1140666 | 217 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); |
011feef8 PF |
218 | |
219 | if (last_addr) | |
220 | client->last_addr = last_addr->s_addr; | |
221 | else | |
222 | client->last_addr = INADDR_ANY; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
2f8e7633 | 227 | int sd_dhcp_client_set_ifindex(sd_dhcp_client *client, int ifindex) { |
011feef8 | 228 | |
2f8e7633 LP |
229 | assert_return(client, -EINVAL); |
230 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); | |
231 | assert_return(ifindex > 0, -EINVAL); | |
011feef8 | 232 | |
2f8e7633 | 233 | client->ifindex = ifindex; |
011feef8 PF |
234 | return 0; |
235 | } | |
236 | ||
4b558378 ZJS |
237 | int sd_dhcp_client_set_mac( |
238 | sd_dhcp_client *client, | |
239 | const uint8_t *addr, | |
240 | size_t addr_len, | |
241 | uint16_t arp_type) { | |
242 | ||
574cc928 | 243 | DHCP_CLIENT_DONT_DESTROY(client); |
4644fee0 TG |
244 | bool need_restart = false; |
245 | ||
46a66b79 | 246 | assert_return(client, -EINVAL); |
4644fee0 | 247 | assert_return(addr, -EINVAL); |
76253e73 DW |
248 | assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); |
249 | assert_return(arp_type > 0, -EINVAL); | |
250 | ||
251 | if (arp_type == ARPHRD_ETHER) | |
252 | assert_return(addr_len == ETH_ALEN, -EINVAL); | |
253 | else if (arp_type == ARPHRD_INFINIBAND) | |
254 | assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); | |
255 | else | |
256 | return -EINVAL; | |
46a66b79 | 257 | |
76253e73 DW |
258 | if (client->mac_addr_len == addr_len && |
259 | memcmp(&client->mac_addr, addr, addr_len) == 0) | |
4644fee0 TG |
260 | return 0; |
261 | ||
781ca7a1 | 262 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { |
a1140666 | 263 | log_dhcp_client(client, "Changing MAC address on running DHCP client, restarting"); |
4644fee0 | 264 | need_restart = true; |
03748142 | 265 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
4644fee0 | 266 | } |
02ec5cd7 | 267 | |
76253e73 DW |
268 | memcpy(&client->mac_addr, addr, addr_len); |
269 | client->mac_addr_len = addr_len; | |
270 | client->arp_type = arp_type; | |
271 | ||
ba6c0fd6 DW |
272 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
273 | sd_dhcp_client_start(client); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
4b558378 ZJS |
278 | int sd_dhcp_client_get_client_id( |
279 | sd_dhcp_client *client, | |
280 | uint8_t *type, | |
281 | const uint8_t **data, | |
282 | size_t *data_len) { | |
ba6c0fd6 DW |
283 | |
284 | assert_return(client, -EINVAL); | |
285 | assert_return(type, -EINVAL); | |
286 | assert_return(data, -EINVAL); | |
287 | assert_return(data_len, -EINVAL); | |
288 | ||
289 | *type = 0; | |
290 | *data = NULL; | |
291 | *data_len = 0; | |
292 | if (client->client_id_len) { | |
5bac5235 | 293 | *type = client->client_id.type; |
ba6c0fd6 | 294 | *data = client->client_id.raw.data; |
5bac5235 | 295 | *data_len = client->client_id_len - sizeof(client->client_id.type); |
ba6c0fd6 DW |
296 | } |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
4b558378 ZJS |
301 | int sd_dhcp_client_set_client_id( |
302 | sd_dhcp_client *client, | |
303 | uint8_t type, | |
304 | const uint8_t *data, | |
305 | size_t data_len) { | |
306 | ||
ba6c0fd6 DW |
307 | DHCP_CLIENT_DONT_DESTROY(client); |
308 | bool need_restart = false; | |
309 | ||
310 | assert_return(client, -EINVAL); | |
311 | assert_return(data, -EINVAL); | |
312 | assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL); | |
313 | ||
5bac5235 TG |
314 | if (client->client_id_len == data_len + sizeof(client->client_id.type) && |
315 | client->client_id.type == type && | |
ba6c0fd6 DW |
316 | memcmp(&client->client_id.raw.data, data, data_len) == 0) |
317 | return 0; | |
318 | ||
bfda0d0f TH |
319 | /* For hardware types, log debug message about unexpected data length. |
320 | * | |
321 | * Note that infiniband's INFINIBAND_ALEN is 20 bytes long, but only | |
322 | * last last 8 bytes of the address are stable and suitable to put into | |
323 | * the client-id. The caller is advised to account for that. */ | |
324 | if ((type == ARPHRD_ETHER && data_len != ETH_ALEN) || | |
325 | (type == ARPHRD_INFINIBAND && data_len != 8)) | |
326 | log_dhcp_client(client, "Changing client ID to hardware type %u with " | |
327 | "unexpected address length %zu", | |
328 | type, data_len); | |
329 | ||
ba6c0fd6 DW |
330 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { |
331 | log_dhcp_client(client, "Changing client ID on running DHCP " | |
332 | "client, restarting"); | |
333 | need_restart = true; | |
03748142 | 334 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
ba6c0fd6 DW |
335 | } |
336 | ||
5bac5235 | 337 | client->client_id.type = type; |
ba6c0fd6 | 338 | memcpy(&client->client_id.raw.data, data, data_len); |
5bac5235 | 339 | client->client_id_len = data_len + sizeof (client->client_id.type); |
46a66b79 | 340 | |
781ca7a1 | 341 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
4644fee0 TG |
342 | sd_dhcp_client_start(client); |
343 | ||
46a66b79 PF |
344 | return 0; |
345 | } | |
346 | ||
d7df2fd3 ZJS |
347 | /** |
348 | * Sets IAID and DUID. If duid is non-null, the DUID is set to duid_type + duid | |
349 | * without further modification. Otherwise, if duid_type is supported, DUID | |
350 | * is set based on that type. Otherwise, an error is returned. | |
351 | */ | |
7e90a499 | 352 | static int dhcp_client_set_iaid_duid_internal( |
4b558378 | 353 | sd_dhcp_client *client, |
8217ed5e TH |
354 | bool iaid_append, |
355 | bool iaid_set, | |
4b558378 ZJS |
356 | uint32_t iaid, |
357 | uint16_t duid_type, | |
f7a92d1a | 358 | const void *duid, |
7e90a499 YW |
359 | size_t duid_len, |
360 | usec_t llt_time) { | |
4b558378 | 361 | |
413708d1 VK |
362 | DHCP_CLIENT_DONT_DESTROY(client); |
363 | int r; | |
d7df2fd3 ZJS |
364 | size_t len; |
365 | ||
413708d1 | 366 | assert_return(client, -EINVAL); |
da3c49e9 | 367 | assert_return(duid_len == 0 || duid, -EINVAL); |
d7df2fd3 | 368 | |
da3c49e9 | 369 | if (duid) { |
ab4a88bc | 370 | r = dhcp_validate_duid_len(duid_type, duid_len, true); |
d7df2fd3 ZJS |
371 | if (r < 0) |
372 | return r; | |
373 | } | |
413708d1 | 374 | |
d7df2fd3 | 375 | zero(client->client_id); |
413708d1 VK |
376 | client->client_id.type = 255; |
377 | ||
8217ed5e TH |
378 | if (iaid_append) { |
379 | if (iaid_set) | |
380 | client->client_id.ns.iaid = htobe32(iaid); | |
381 | else { | |
dace710c YW |
382 | r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, |
383 | client->mac_addr_len, | |
6d13616b | 384 | true, |
dace710c YW |
385 | &client->client_id.ns.iaid); |
386 | if (r < 0) | |
387 | return r; | |
8217ed5e | 388 | } |
dace710c | 389 | } |
413708d1 | 390 | |
da3c49e9 | 391 | if (duid) { |
413708d1 VK |
392 | client->client_id.ns.duid.type = htobe16(duid_type); |
393 | memcpy(&client->client_id.ns.duid.raw.data, duid, duid_len); | |
d7df2fd3 | 394 | len = sizeof(client->client_id.ns.duid.type) + duid_len; |
d7df2fd3 | 395 | } else |
27eba50e | 396 | switch (duid_type) { |
335f80a6 | 397 | case DUID_TYPE_LLT: |
339697f0 | 398 | if (client->mac_addr_len == 0) |
335f80a6 YW |
399 | return -EOPNOTSUPP; |
400 | ||
7e90a499 | 401 | 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 |
402 | if (r < 0) |
403 | return r; | |
404 | break; | |
27eba50e YW |
405 | case DUID_TYPE_EN: |
406 | r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &len); | |
407 | if (r < 0) | |
408 | return r; | |
409 | break; | |
335f80a6 | 410 | case DUID_TYPE_LL: |
339697f0 | 411 | if (client->mac_addr_len == 0) |
335f80a6 YW |
412 | return -EOPNOTSUPP; |
413 | ||
414 | r = dhcp_identifier_set_duid_ll(&client->client_id.ns.duid, client->mac_addr, client->mac_addr_len, client->arp_type, &len); | |
415 | if (r < 0) | |
416 | return r; | |
417 | break; | |
27eba50e YW |
418 | case DUID_TYPE_UUID: |
419 | r = dhcp_identifier_set_duid_uuid(&client->client_id.ns.duid, &len); | |
420 | if (r < 0) | |
421 | return r; | |
422 | break; | |
423 | default: | |
335f80a6 | 424 | return -EINVAL; |
27eba50e | 425 | } |
413708d1 | 426 | |
d7df2fd3 | 427 | client->client_id_len = sizeof(client->client_id.type) + len + |
8217ed5e | 428 | (iaid_append ? sizeof(client->client_id.ns.iaid) : 0); |
413708d1 VK |
429 | |
430 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { | |
8217ed5e | 431 | log_dhcp_client(client, "Configured %sDUID, restarting.", iaid_append ? "IAID+" : ""); |
413708d1 VK |
432 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
433 | sd_dhcp_client_start(client); | |
434 | } | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
dace710c YW |
439 | int sd_dhcp_client_set_iaid_duid( |
440 | sd_dhcp_client *client, | |
8217ed5e | 441 | bool iaid_set, |
dace710c YW |
442 | uint32_t iaid, |
443 | uint16_t duid_type, | |
444 | const void *duid, | |
445 | size_t duid_len) { | |
8217ed5e | 446 | return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, duid_type, duid, duid_len, 0); |
7e90a499 YW |
447 | } |
448 | ||
449 | int sd_dhcp_client_set_iaid_duid_llt( | |
450 | sd_dhcp_client *client, | |
8217ed5e | 451 | bool iaid_set, |
7e90a499 YW |
452 | uint32_t iaid, |
453 | usec_t llt_time) { | |
8217ed5e | 454 | return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, DUID_TYPE_LLT, NULL, 0, llt_time); |
dace710c YW |
455 | } |
456 | ||
457 | int sd_dhcp_client_set_duid( | |
458 | sd_dhcp_client *client, | |
459 | uint16_t duid_type, | |
460 | const void *duid, | |
461 | size_t duid_len) { | |
8217ed5e | 462 | return dhcp_client_set_iaid_duid_internal(client, false, false, 0, duid_type, duid, duid_len, 0); |
7e90a499 YW |
463 | } |
464 | ||
465 | int sd_dhcp_client_set_duid_llt( | |
466 | sd_dhcp_client *client, | |
467 | usec_t llt_time) { | |
8217ed5e | 468 | return dhcp_client_set_iaid_duid_internal(client, false, false, 0, DUID_TYPE_LLT, NULL, 0, llt_time); |
dace710c YW |
469 | } |
470 | ||
4b558378 ZJS |
471 | int sd_dhcp_client_set_hostname( |
472 | sd_dhcp_client *client, | |
473 | const char *hostname) { | |
474 | ||
4cc7a82c EY |
475 | assert_return(client, -EINVAL); |
476 | ||
9740eae6 | 477 | /* Make sure hostnames qualify as DNS and as Linux hostnames */ |
ef8b0084 | 478 | if (hostname && |
9740eae6 | 479 | !(hostname_is_valid(hostname, false) && dns_name_is_valid(hostname) > 0)) |
23873e25 BG |
480 | return -EINVAL; |
481 | ||
ef8b0084 | 482 | return free_and_strdup(&client->hostname, hostname); |
4cc7a82c EY |
483 | } |
484 | ||
4b558378 ZJS |
485 | int sd_dhcp_client_set_vendor_class_identifier( |
486 | sd_dhcp_client *client, | |
487 | const char *vci) { | |
488 | ||
edb85f0d SS |
489 | assert_return(client, -EINVAL); |
490 | ||
ef8b0084 | 491 | return free_and_strdup(&client->vendor_class_identifier, vci); |
edb85f0d SS |
492 | } |
493 | ||
af1c0de0 SS |
494 | int sd_dhcp_client_set_user_class( |
495 | sd_dhcp_client *client, | |
496 | const char* const* user_class) { | |
497 | ||
498 | _cleanup_strv_free_ char **s = NULL; | |
499 | char **p; | |
500 | ||
501 | STRV_FOREACH(p, (char **) user_class) | |
502 | if (strlen(*p) > 255) | |
503 | return -ENAMETOOLONG; | |
504 | ||
505 | s = strv_copy((char **) user_class); | |
506 | if (!s) | |
507 | return -ENOMEM; | |
508 | ||
509 | client->user_class = TAKE_PTR(s); | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
9faed222 SS |
514 | int sd_dhcp_client_set_client_port( |
515 | sd_dhcp_client *client, | |
516 | uint16_t port) { | |
517 | ||
518 | assert_return(client, -EINVAL); | |
519 | ||
520 | client->port = port; | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
324f8187 TG |
525 | int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) { |
526 | assert_return(client, -EINVAL); | |
527 | assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE); | |
528 | ||
529 | client->mtu = mtu; | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
715cedfb SS |
534 | int sd_dhcp_client_set_max_attempts(sd_dhcp_client *client, uint64_t max_attempts) { |
535 | assert_return(client, -EINVAL); | |
536 | ||
537 | client->max_attempts = max_attempts; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | ||
cb29c156 SS |
542 | static sd_dhcp_option* dhcp_option_free(sd_dhcp_option *i) { |
543 | if (!i) | |
544 | return NULL; | |
545 | ||
546 | free(i->data); | |
547 | return mfree(i); | |
548 | } | |
549 | ||
550 | int sd_dhcp_option_new(uint8_t option, void *data, size_t length, sd_dhcp_option **ret) { | |
551 | _cleanup_(sd_dhcp_option_unrefp) sd_dhcp_option *p = NULL; | |
552 | _cleanup_free_ void *q = NULL; | |
553 | ||
554 | assert(ret); | |
555 | ||
556 | q = memdup(data, length); | |
557 | if (!q) | |
558 | return -ENOMEM; | |
559 | ||
560 | p = new(sd_dhcp_option, 1); | |
561 | if (!p) | |
562 | return -ENOMEM; | |
563 | ||
564 | *p = (sd_dhcp_option) { | |
565 | .n_ref = 1, | |
566 | .option = option, | |
567 | .length = length, | |
568 | .data = TAKE_PTR(q), | |
569 | }; | |
570 | ||
571 | *ret = TAKE_PTR(p); | |
572 | return 0; | |
573 | } | |
574 | ||
575 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_option, sd_dhcp_option, dhcp_option_free); | |
576 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR( | |
577 | dhcp_option_hash_ops, | |
578 | void, | |
579 | trivial_hash_func, | |
580 | trivial_compare_func, | |
581 | sd_dhcp_option, | |
582 | sd_dhcp_option_unref); | |
583 | ||
584 | int sd_dhcp_client_set_dhcp_option(sd_dhcp_client *client, sd_dhcp_option *v) { | |
585 | int r; | |
586 | ||
587 | assert_return(client, -EINVAL); | |
588 | assert_return(v, -EINVAL); | |
589 | ||
590 | r = ordered_hashmap_ensure_allocated(&client->options, &dhcp_option_hash_ops); | |
591 | if (r < 0) | |
592 | return r; | |
593 | ||
594 | r = ordered_hashmap_put(client->options, UINT_TO_PTR(v->option), v); | |
595 | if (r < 0) | |
596 | return r; | |
597 | ||
598 | sd_dhcp_option_ref(v); | |
599 | return 0; | |
600 | } | |
601 | ||
a6cc569e | 602 | int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) { |
751246ee | 603 | assert_return(client, -EINVAL); |
751246ee | 604 | |
727b5734 | 605 | if (!IN_SET(client->state, DHCP_STATE_SELECTING, DHCP_STATE_BOUND, DHCP_STATE_RENEWING, DHCP_STATE_REBINDING)) |
a6cc569e | 606 | return -EADDRNOTAVAIL; |
751246ee | 607 | |
a1140666 LP |
608 | if (ret) |
609 | *ret = client->lease; | |
4f882b2a TG |
610 | |
611 | return 0; | |
612 | } | |
613 | ||
afe42aef SC |
614 | int sd_dhcp_client_set_service_type(sd_dhcp_client *client, int type) { |
615 | assert_return(client, -EINVAL); | |
616 | ||
617 | client->ip_service_type = type; | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
727b5734 | 622 | static int client_notify(sd_dhcp_client *client, int event) { |
45aa74c7 LP |
623 | assert(client); |
624 | ||
625 | if (client->callback) | |
727b5734 SS |
626 | return client->callback(client, event, client->userdata); |
627 | ||
628 | return 0; | |
3e3d8f78 PF |
629 | } |
630 | ||
0f941add | 631 | static int client_initialize(sd_dhcp_client *client) { |
bbdf06d9 | 632 | assert_return(client, -EINVAL); |
bbdf06d9 | 633 | |
a1140666 | 634 | client->receive_message = sd_event_source_unref(client->receive_message); |
8c00042c | 635 | |
22fc2420 | 636 | client->fd = asynchronous_close(client->fd); |
8c00042c | 637 | |
a3fa4287 YW |
638 | (void) event_source_disable(client->timeout_resend); |
639 | (void) event_source_disable(client->timeout_t1); | |
640 | (void) event_source_disable(client->timeout_t2); | |
641 | (void) event_source_disable(client->timeout_expire); | |
51debc1e | 642 | |
11793fcd | 643 | client->attempt = 0; |
e2dfc79f | 644 | |
f8fdefe4 | 645 | client->state = DHCP_STATE_INIT; |
0f941add | 646 | client->xid = 0; |
bbdf06d9 | 647 | |
0339cd77 | 648 | client->lease = sd_dhcp_lease_unref(client->lease); |
8c00042c | 649 | |
0f941add PF |
650 | return 0; |
651 | } | |
652 | ||
574cc928 TG |
653 | static void client_stop(sd_dhcp_client *client, int error) { |
654 | assert(client); | |
0f941add | 655 | |
ccfdc9a1 | 656 | if (error < 0) |
7fa6223f | 657 | log_dhcp_client_errno(client, error, "STOPPED: %m"); |
03748142 | 658 | else if (error == SD_DHCP_CLIENT_EVENT_STOP) |
2d2349cc TG |
659 | log_dhcp_client(client, "STOPPED"); |
660 | else | |
661 | log_dhcp_client(client, "STOPPED: Unknown event"); | |
0f941add | 662 | |
574cc928 | 663 | client_notify(client, error); |
ee57a737 | 664 | |
574cc928 | 665 | client_initialize(client); |
bbdf06d9 PF |
666 | } |
667 | ||
4b558378 ZJS |
668 | static int client_message_init( |
669 | sd_dhcp_client *client, | |
670 | DHCPPacket **ret, | |
671 | uint8_t type, | |
672 | size_t *_optlen, | |
673 | size_t *_optoffset) { | |
674 | ||
3587161a | 675 | _cleanup_free_ DHCPPacket *packet = NULL; |
424a8732 | 676 | size_t optlen, optoffset, size; |
8a9e7616 | 677 | be16_t max_size; |
d8d74ef0 DW |
678 | usec_t time_now; |
679 | uint16_t secs; | |
cf597f65 | 680 | int r; |
46a66b79 | 681 | |
6236f49b | 682 | assert(client); |
d8d74ef0 | 683 | assert(client->start_time); |
424a8732 TG |
684 | assert(ret); |
685 | assert(_optlen); | |
686 | assert(_optoffset); | |
1501b429 | 687 | assert(IN_SET(type, DHCP_DISCOVER, DHCP_REQUEST, DHCP_RELEASE)); |
0a1b6da8 | 688 | |
424a8732 TG |
689 | optlen = DHCP_MIN_OPTIONS_SIZE; |
690 | size = sizeof(DHCPPacket) + optlen; | |
691 | ||
692 | packet = malloc0(size); | |
693 | if (!packet) | |
694 | return -ENOMEM; | |
695 | ||
696 | r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type, | |
76253e73 | 697 | client->arp_type, optlen, &optoffset); |
cf597f65 TG |
698 | if (r < 0) |
699 | return r; | |
46a66b79 | 700 | |
0a1b6da8 TG |
701 | /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers |
702 | refuse to issue an DHCP lease if 'secs' is set to zero */ | |
d8d74ef0 DW |
703 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
704 | if (r < 0) | |
705 | return r; | |
706 | assert(time_now >= client->start_time); | |
707 | ||
708 | /* seconds between sending first and last DISCOVER | |
709 | * must always be strictly positive to deal with broken servers */ | |
710 | secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1; | |
711 | packet->dhcp.secs = htobe16(secs); | |
0a1b6da8 | 712 | |
63a07041 CA |
713 | /* RFC2132 section 4.1 |
714 | A client that cannot receive unicast IP datagrams until its protocol | |
715 | software has been configured with an IP address SHOULD set the | |
716 | BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or | |
717 | DHCPREQUEST messages that client sends. The BROADCAST bit will | |
718 | provide a hint to the DHCP server and BOOTP relay agent to broadcast | |
f5de5b00 TG |
719 | any messages to the client on the client's subnet. |
720 | ||
721 | Note: some interfaces needs this to be enabled, but some networks | |
722 | needs this to be disabled as broadcasts are filteretd, so this | |
723 | needs to be configurable */ | |
76253e73 | 724 | if (client->request_broadcast || client->arp_type != ARPHRD_ETHER) |
f5de5b00 | 725 | packet->dhcp.flags = htobe16(0x8000); |
63a07041 | 726 | |
50d6810e TG |
727 | /* RFC2132 section 4.1.1: |
728 | The client MUST include its hardware address in the ’chaddr’ field, if | |
76253e73 DW |
729 | necessary for delivery of DHCP reply messages. Non-Ethernet |
730 | interfaces will leave 'chaddr' empty and use the client identifier | |
731 | instead (eg, RFC 4390 section 2.1). | |
50d6810e | 732 | */ |
76253e73 DW |
733 | if (client->arp_type == ARPHRD_ETHER) |
734 | memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN); | |
f5a70de7 | 735 | |
afec4539 | 736 | /* If no client identifier exists, construct an RFC 4361-compliant one */ |
5bac5235 TG |
737 | if (client->client_id_len == 0) { |
738 | size_t duid_len; | |
739 | ||
740 | client->client_id.type = 255; | |
741 | ||
6d13616b TH |
742 | r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, |
743 | true, &client->client_id.ns.iaid); | |
5bac5235 TG |
744 | if (r < 0) |
745 | return r; | |
746 | ||
747 | r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &duid_len); | |
748 | if (r < 0) | |
749 | return r; | |
750 | ||
751 | client->client_id_len = sizeof(client->client_id.type) + sizeof(client->client_id.ns.iaid) + duid_len; | |
ba6c0fd6 DW |
752 | } |
753 | ||
ee57a737 | 754 | /* Some DHCP servers will refuse to issue an DHCP lease if the Client |
46a66b79 | 755 | Identifier option is not set */ |
ba6c0fd6 DW |
756 | if (client->client_id_len) { |
757 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, | |
22805d92 | 758 | SD_DHCP_OPTION_CLIENT_IDENTIFIER, |
ba6c0fd6 | 759 | client->client_id_len, |
5bac5235 | 760 | &client->client_id); |
ba6c0fd6 DW |
761 | if (r < 0) |
762 | return r; | |
763 | } | |
50d6810e TG |
764 | |
765 | /* RFC2131 section 3.5: | |
766 | in its initial DHCPDISCOVER or DHCPREQUEST message, a | |
767 | client may provide the server with a list of specific | |
768 | parameters the client is interested in. If the client | |
769 | includes a list of parameters in a DHCPDISCOVER message, | |
770 | it MUST include that list in any subsequent DHCPREQUEST | |
771 | messages. | |
772 | */ | |
5e77a146 | 773 | |
774 | /* RFC7844 section 3: | |
775 | MAY contain the Parameter Request List option. */ | |
776 | /* NOTE: in case that there would be an option to do not send | |
777 | * any PRL at all, the size should be checked before sending */ | |
1501b429 | 778 | if (client->req_opts_size > 0 && type != DHCP_RELEASE) { |
5e77a146 | 779 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, |
780 | SD_DHCP_OPTION_PARAMETER_REQUEST_LIST, | |
781 | client->req_opts_size, client->req_opts); | |
782 | if (r < 0) | |
783 | return r; | |
784 | } | |
8a9e7616 | 785 | |
50d6810e TG |
786 | /* RFC2131 section 3.5: |
787 | The client SHOULD include the ’maximum DHCP message size’ option to | |
788 | let the server know how large the server may make its DHCP messages. | |
789 | ||
790 | Note (from ConnMan): Some DHCP servers will send bigger DHCP packets | |
f21f31b2 | 791 | than the defined default size unless the Maximum Message Size option |
f131770b | 792 | is explicitly set |
324f8187 TG |
793 | |
794 | RFC3442 "Requirements to Avoid Sizing Constraints": | |
795 | Because a full routing table can be quite large, the standard 576 | |
796 | octet maximum size for a DHCP message may be too short to contain | |
797 | some legitimate Classless Static Route options. Because of this, | |
798 | clients implementing the Classless Static Route option SHOULD send a | |
799 | Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP | |
800 | stack is capable of receiving larger IP datagrams. In this case, the | |
801 | client SHOULD set the value of this option to at least the MTU of the | |
802 | interface that the client is configuring. The client MAY set the | |
803 | value of this option higher, up to the size of the largest UDP packet | |
804 | it is prepared to accept. (Note that the value specified in the | |
805 | Maximum DHCP Message Size option is the total maximum packet size, | |
806 | including IP and UDP headers.) | |
50d6810e | 807 | */ |
1b41b815 | 808 | /* RFC7844 section 3: |
809 | SHOULD NOT contain any other option. */ | |
1501b429 | 810 | if (!client->anonymize && type != DHCP_RELEASE) { |
1b41b815 | 811 | max_size = htobe16(size); |
812 | r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0, | |
813 | SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, | |
814 | 2, &max_size); | |
815 | if (r < 0) | |
816 | return r; | |
817 | } | |
46a66b79 | 818 | |
424a8732 TG |
819 | *_optlen = optlen; |
820 | *_optoffset = optoffset; | |
1cc6c93a | 821 | *ret = TAKE_PTR(packet); |
424a8732 | 822 | |
46a66b79 PF |
823 | return 0; |
824 | } | |
825 | ||
4b558378 ZJS |
826 | static int client_append_fqdn_option( |
827 | DHCPMessage *message, | |
828 | size_t optlen, | |
829 | size_t *optoffset, | |
830 | const char *fqdn) { | |
831 | ||
23873e25 BG |
832 | uint8_t buffer[3 + DHCP_MAX_FQDN_LENGTH]; |
833 | int r; | |
834 | ||
835 | buffer[0] = DHCP_FQDN_FLAG_S | /* Request server to perform A RR DNS updates */ | |
836 | DHCP_FQDN_FLAG_E; /* Canonical wire format */ | |
837 | buffer[1] = 0; /* RCODE1 (deprecated) */ | |
838 | buffer[2] = 0; /* RCODE2 (deprecated) */ | |
839 | ||
3cd03457 | 840 | r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3, false); |
23873e25 BG |
841 | if (r > 0) |
842 | r = dhcp_option_append(message, optlen, optoffset, 0, | |
22805d92 | 843 | SD_DHCP_OPTION_FQDN, 3 + r, buffer); |
23873e25 BG |
844 | |
845 | return r; | |
846 | } | |
847 | ||
4b558378 ZJS |
848 | static int dhcp_client_send_raw( |
849 | sd_dhcp_client *client, | |
850 | DHCPPacket *packet, | |
851 | size_t len) { | |
852 | ||
9faed222 | 853 | dhcp_packet_append_ip_headers(packet, INADDR_ANY, client->port, |
afe42aef | 854 | INADDR_BROADCAST, DHCP_PORT_SERVER, len, client->ip_service_type); |
63edaa62 TG |
855 | |
856 | return dhcp_network_send_raw_socket(client->fd, &client->link, | |
857 | packet, len); | |
858 | } | |
859 | ||
6236f49b | 860 | static int client_send_discover(sd_dhcp_client *client) { |
9f2a50a3 | 861 | _cleanup_free_ DHCPPacket *discover = NULL; |
424a8732 | 862 | size_t optoffset, optlen; |
cb29c156 SS |
863 | sd_dhcp_option *j; |
864 | Iterator i; | |
6236f49b TG |
865 | int r; |
866 | ||
867 | assert(client); | |
4c701096 | 868 | assert(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_SELECTING)); |
50d6810e | 869 | |
424a8732 TG |
870 | r = client_message_init(client, &discover, DHCP_DISCOVER, |
871 | &optlen, &optoffset); | |
6236f49b TG |
872 | if (r < 0) |
873 | return r; | |
46a66b79 | 874 | |
50d6810e TG |
875 | /* the client may suggest values for the network address |
876 | and lease time in the DHCPDISCOVER message. The client may include | |
877 | the ’requested IP address’ option to suggest that a particular IP | |
878 | address be assigned, and may include the ’IP address lease time’ | |
879 | option to suggest the lease time it would like. | |
880 | */ | |
46a66b79 | 881 | if (client->last_addr != INADDR_ANY) { |
04b28be1 | 882 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
22805d92 | 883 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
20b958bf | 884 | 4, &client->last_addr); |
6236f49b TG |
885 | if (r < 0) |
886 | return r; | |
46a66b79 PF |
887 | } |
888 | ||
4cc7a82c | 889 | if (client->hostname) { |
23873e25 BG |
890 | /* According to RFC 4702 "clients that send the Client FQDN option in |
891 | their messages MUST NOT also send the Host Name option". Just send | |
892 | one of the two depending on the hostname type. | |
893 | */ | |
dc477e73 | 894 | if (dns_name_is_single_label(client->hostname)) { |
23873e25 BG |
895 | /* it is unclear from RFC 2131 if client should send hostname in |
896 | DHCPDISCOVER but dhclient does and so we do as well | |
897 | */ | |
898 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
22805d92 | 899 | SD_DHCP_OPTION_HOST_NAME, |
23873e25 BG |
900 | strlen(client->hostname), client->hostname); |
901 | } else | |
902 | r = client_append_fqdn_option(&discover->dhcp, optlen, &optoffset, | |
903 | client->hostname); | |
4cc7a82c EY |
904 | if (r < 0) |
905 | return r; | |
906 | } | |
907 | ||
edb85f0d SS |
908 | if (client->vendor_class_identifier) { |
909 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
22805d92 | 910 | SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, |
edb85f0d SS |
911 | strlen(client->vendor_class_identifier), |
912 | client->vendor_class_identifier); | |
913 | if (r < 0) | |
914 | return r; | |
915 | } | |
916 | ||
af1c0de0 SS |
917 | if (client->user_class) { |
918 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
919 | SD_DHCP_OPTION_USER_CLASS, | |
920 | strv_length(client->user_class), | |
921 | client->user_class); | |
922 | if (r < 0) | |
923 | return r; | |
924 | } | |
925 | ||
cb29c156 SS |
926 | ORDERED_HASHMAP_FOREACH(j, client->options, i) { |
927 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
928 | j->option, j->length, j->data); | |
929 | if (r < 0) | |
930 | return r; | |
931 | } | |
932 | ||
04b28be1 | 933 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
22805d92 | 934 | SD_DHCP_OPTION_END, 0, NULL); |
f7926298 TA |
935 | if (r < 0) |
936 | return r; | |
46a66b79 | 937 | |
50d6810e TG |
938 | /* We currently ignore: |
939 | The client SHOULD wait a random time between one and ten seconds to | |
940 | desynchronize the use of DHCP at startup. | |
941 | */ | |
20b958bf | 942 | r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset); |
6236f49b TG |
943 | if (r < 0) |
944 | return r; | |
e2dfc79f | 945 | |
ee57a737 TG |
946 | log_dhcp_client(client, "DISCOVER"); |
947 | ||
63edaa62 | 948 | return 0; |
e2dfc79f PF |
949 | } |
950 | ||
6236f49b | 951 | static int client_send_request(sd_dhcp_client *client) { |
8186d9dd | 952 | _cleanup_free_ DHCPPacket *request = NULL; |
424a8732 | 953 | size_t optoffset, optlen; |
6236f49b | 954 | int r; |
e2dfc79f | 955 | |
a1140666 LP |
956 | assert(client); |
957 | ||
958 | r = client_message_init(client, &request, DHCP_REQUEST, &optlen, &optoffset); | |
6236f49b TG |
959 | if (r < 0) |
960 | return r; | |
46a66b79 | 961 | |
8b1243f7 | 962 | switch (client->state) { |
50d6810e TG |
963 | /* See RFC2131 section 4.3.2 (note that there is a typo in the RFC, |
964 | SELECTING should be REQUESTING) | |
965 | */ | |
966 | ||
967 | case DHCP_STATE_REQUESTING: | |
968 | /* Client inserts the address of the selected server in ’server | |
969 | identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be | |
970 | filled in with the yiaddr value from the chosen DHCPOFFER. | |
971 | */ | |
8b1243f7 | 972 | |
04b28be1 | 973 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 974 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
50d6810e | 975 | 4, &client->lease->server_address); |
6236f49b TG |
976 | if (r < 0) |
977 | return r; | |
8b1243f7 | 978 | |
04b28be1 | 979 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 980 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
6236f49b TG |
981 | 4, &client->lease->address); |
982 | if (r < 0) | |
983 | return r; | |
984 | ||
50d6810e TG |
985 | break; |
986 | ||
987 | case DHCP_STATE_INIT_REBOOT: | |
988 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ | |
989 | option MUST be filled in with client’s notion of its previously | |
990 | assigned address. ’ciaddr’ MUST be zero. | |
991 | */ | |
04b28be1 | 992 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 993 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
50d6810e | 994 | 4, &client->last_addr); |
6236f49b TG |
995 | if (r < 0) |
996 | return r; | |
8b1243f7 PF |
997 | break; |
998 | ||
8b1243f7 | 999 | case DHCP_STATE_RENEWING: |
50d6810e TG |
1000 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
1001 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
1002 | client’s IP address. | |
1003 | */ | |
1004 | ||
8b1243f7 | 1005 | case DHCP_STATE_REBINDING: |
50d6810e TG |
1006 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
1007 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
1008 | client’s IP address. | |
1009 | ||
1010 | This message MUST be broadcast to the 0xffffffff IP broadcast address. | |
1011 | */ | |
1012 | request->dhcp.ciaddr = client->lease->address; | |
8b1243f7 PF |
1013 | |
1014 | break; | |
781ca7a1 | 1015 | |
50d6810e TG |
1016 | case DHCP_STATE_INIT: |
1017 | case DHCP_STATE_SELECTING: | |
1018 | case DHCP_STATE_REBOOTING: | |
1019 | case DHCP_STATE_BOUND: | |
781ca7a1 PF |
1020 | case DHCP_STATE_STOPPED: |
1021 | return -EINVAL; | |
e2dfc79f | 1022 | } |
46a66b79 | 1023 | |
4cc7a82c | 1024 | if (client->hostname) { |
dc477e73 | 1025 | if (dns_name_is_single_label(client->hostname)) |
23873e25 | 1026 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 1027 | SD_DHCP_OPTION_HOST_NAME, |
23873e25 BG |
1028 | strlen(client->hostname), client->hostname); |
1029 | else | |
1030 | r = client_append_fqdn_option(&request->dhcp, optlen, &optoffset, | |
1031 | client->hostname); | |
4cc7a82c EY |
1032 | if (r < 0) |
1033 | return r; | |
1034 | } | |
1035 | ||
5153494f AG |
1036 | if (client->vendor_class_identifier) { |
1037 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, | |
1038 | SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, | |
1039 | strlen(client->vendor_class_identifier), | |
1040 | client->vendor_class_identifier); | |
1041 | if (r < 0) | |
1042 | return r; | |
1043 | } | |
1044 | ||
04b28be1 | 1045 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 1046 | SD_DHCP_OPTION_END, 0, NULL); |
6236f49b TG |
1047 | if (r < 0) |
1048 | return r; | |
46a66b79 | 1049 | |
bdbb98d9 | 1050 | if (client->state == DHCP_STATE_RENEWING) |
6236f49b TG |
1051 | r = dhcp_network_send_udp_socket(client->fd, |
1052 | client->lease->server_address, | |
1053 | DHCP_PORT_SERVER, | |
1054 | &request->dhcp, | |
20b958bf | 1055 | sizeof(DHCPMessage) + optoffset); |
bdbb98d9 | 1056 | else |
20b958bf | 1057 | r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset); |
6236f49b TG |
1058 | if (r < 0) |
1059 | return r; | |
46a66b79 | 1060 | |
998d8047 | 1061 | switch (client->state) { |
a1140666 | 1062 | |
998d8047 TG |
1063 | case DHCP_STATE_REQUESTING: |
1064 | log_dhcp_client(client, "REQUEST (requesting)"); | |
1065 | break; | |
a1140666 | 1066 | |
998d8047 TG |
1067 | case DHCP_STATE_INIT_REBOOT: |
1068 | log_dhcp_client(client, "REQUEST (init-reboot)"); | |
1069 | break; | |
a1140666 | 1070 | |
998d8047 TG |
1071 | case DHCP_STATE_RENEWING: |
1072 | log_dhcp_client(client, "REQUEST (renewing)"); | |
1073 | break; | |
a1140666 | 1074 | |
998d8047 TG |
1075 | case DHCP_STATE_REBINDING: |
1076 | log_dhcp_client(client, "REQUEST (rebinding)"); | |
1077 | break; | |
a1140666 | 1078 | |
998d8047 TG |
1079 | default: |
1080 | log_dhcp_client(client, "REQUEST (invalid)"); | |
1081 | break; | |
1082 | } | |
ee57a737 | 1083 | |
63edaa62 | 1084 | return 0; |
46a66b79 PF |
1085 | } |
1086 | ||
7739a40b TG |
1087 | static int client_start(sd_dhcp_client *client); |
1088 | ||
4b558378 ZJS |
1089 | static int client_timeout_resend( |
1090 | sd_event_source *s, | |
1091 | uint64_t usec, | |
1092 | void *userdata) { | |
1093 | ||
d3d8ac2f | 1094 | sd_dhcp_client *client = userdata; |
574cc928 | 1095 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 | 1096 | usec_t next_timeout = 0; |
d23c45bf | 1097 | uint64_t time_now; |
aba26854 | 1098 | uint32_t time_left; |
d23c45bf | 1099 | int r; |
b25ef18b TG |
1100 | |
1101 | assert(s); | |
1102 | assert(client); | |
1103 | assert(client->event); | |
d3d8ac2f | 1104 | |
fa94c34b | 1105 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d23c45bf TG |
1106 | if (r < 0) |
1107 | goto error; | |
1108 | ||
aba26854 | 1109 | switch (client->state) { |
a1140666 | 1110 | |
aba26854 PF |
1111 | case DHCP_STATE_RENEWING: |
1112 | ||
e5002702 | 1113 | time_left = (client->lease->t2 - client->lease->t1) / 2; |
aba26854 PF |
1114 | if (time_left < 60) |
1115 | time_left = 60; | |
d3d8ac2f | 1116 | |
d23c45bf | 1117 | next_timeout = time_now + time_left * USEC_PER_SEC; |
d3d8ac2f | 1118 | |
aba26854 PF |
1119 | break; |
1120 | ||
3dd71400 PF |
1121 | case DHCP_STATE_REBINDING: |
1122 | ||
e5002702 | 1123 | time_left = (client->lease->lifetime - client->lease->t2) / 2; |
3dd71400 PF |
1124 | if (time_left < 60) |
1125 | time_left = 60; | |
1126 | ||
d23c45bf | 1127 | next_timeout = time_now + time_left * USEC_PER_SEC; |
3dd71400 PF |
1128 | break; |
1129 | ||
8b1243f7 PF |
1130 | case DHCP_STATE_REBOOTING: |
1131 | /* start over as we did not receive a timely ack or nak */ | |
7739a40b | 1132 | r = client_initialize(client); |
eb105b96 TG |
1133 | if (r < 0) |
1134 | goto error; | |
8b1243f7 | 1135 | |
998d8047 TG |
1136 | r = client_start(client); |
1137 | if (r < 0) | |
1138 | goto error; | |
1139 | else { | |
1140 | log_dhcp_client(client, "REBOOTED"); | |
1141 | return 0; | |
1142 | } | |
7739a40b | 1143 | |
aba26854 PF |
1144 | case DHCP_STATE_INIT: |
1145 | case DHCP_STATE_INIT_REBOOT: | |
aba26854 PF |
1146 | case DHCP_STATE_SELECTING: |
1147 | case DHCP_STATE_REQUESTING: | |
1148 | case DHCP_STATE_BOUND: | |
aba26854 | 1149 | |
715cedfb | 1150 | if (client->attempt < client->max_attempts) |
11793fcd | 1151 | client->attempt++; |
8bc17bb3 SS |
1152 | else |
1153 | goto error; | |
aba26854 | 1154 | |
715cedfb | 1155 | next_timeout = time_now + ((UINT64_C(1) << MIN(client->attempt, (uint64_t) 6)) - 1) * USEC_PER_SEC; |
aba26854 PF |
1156 | |
1157 | break; | |
781ca7a1 PF |
1158 | |
1159 | case DHCP_STATE_STOPPED: | |
1160 | r = -EINVAL; | |
1161 | goto error; | |
aba26854 PF |
1162 | } |
1163 | ||
9bf3b535 | 1164 | next_timeout += (random_u32() & 0x1fffff); |
d3d8ac2f | 1165 | |
a3fa4287 YW |
1166 | r = event_reset_time(client->event, &client->timeout_resend, |
1167 | clock_boottime_or_monotonic(), | |
1168 | next_timeout, 10 * USEC_PER_MSEC, | |
1169 | client_timeout_resend, client, | |
1170 | client->event_priority, "dhcp4-resend-timer", true); | |
9021bb9f TG |
1171 | if (r < 0) |
1172 | goto error; | |
1173 | ||
e2dfc79f PF |
1174 | switch (client->state) { |
1175 | case DHCP_STATE_INIT: | |
6236f49b | 1176 | r = client_send_discover(client); |
b25ef18b | 1177 | if (r >= 0) { |
e2dfc79f | 1178 | client->state = DHCP_STATE_SELECTING; |
11793fcd | 1179 | client->attempt = 0; |
715cedfb SS |
1180 | } else if (client->attempt >= client->max_attempts) |
1181 | goto error; | |
e2dfc79f PF |
1182 | |
1183 | break; | |
1184 | ||
1185 | case DHCP_STATE_SELECTING: | |
6236f49b | 1186 | r = client_send_discover(client); |
715cedfb | 1187 | if (r < 0 && client->attempt >= client->max_attempts) |
d3d8ac2f PF |
1188 | goto error; |
1189 | ||
e2dfc79f PF |
1190 | break; |
1191 | ||
8b1243f7 | 1192 | case DHCP_STATE_INIT_REBOOT: |
e2dfc79f | 1193 | case DHCP_STATE_REQUESTING: |
aba26854 | 1194 | case DHCP_STATE_RENEWING: |
3dd71400 | 1195 | case DHCP_STATE_REBINDING: |
6236f49b | 1196 | r = client_send_request(client); |
715cedfb | 1197 | if (r < 0 && client->attempt >= client->max_attempts) |
e2dfc79f | 1198 | goto error; |
d3d8ac2f | 1199 | |
8b1243f7 PF |
1200 | if (client->state == DHCP_STATE_INIT_REBOOT) |
1201 | client->state = DHCP_STATE_REBOOTING; | |
1202 | ||
d23c45bf | 1203 | client->request_sent = time_now; |
51debc1e | 1204 | |
d3d8ac2f PF |
1205 | break; |
1206 | ||
d3d8ac2f | 1207 | case DHCP_STATE_REBOOTING: |
d3d8ac2f | 1208 | case DHCP_STATE_BOUND: |
d3d8ac2f PF |
1209 | |
1210 | break; | |
781ca7a1 PF |
1211 | |
1212 | case DHCP_STATE_STOPPED: | |
1213 | r = -EINVAL; | |
1214 | goto error; | |
d3d8ac2f PF |
1215 | } |
1216 | ||
1217 | return 0; | |
1218 | ||
1219 | error: | |
b25ef18b | 1220 | client_stop(client, r); |
d3d8ac2f PF |
1221 | |
1222 | /* Errors were dealt with when stopping the client, don't spill | |
1223 | errors into the event loop handler */ | |
1224 | return 0; | |
1225 | } | |
1226 | ||
4b558378 ZJS |
1227 | static int client_initialize_io_events( |
1228 | sd_dhcp_client *client, | |
1229 | sd_event_io_handler_t io_callback) { | |
1230 | ||
6a1cd41e PF |
1231 | int r; |
1232 | ||
b25ef18b TG |
1233 | assert(client); |
1234 | assert(client->event); | |
1235 | ||
151b9b96 LP |
1236 | r = sd_event_add_io(client->event, &client->receive_message, |
1237 | client->fd, EPOLLIN, io_callback, | |
1238 | client); | |
6a1cd41e PF |
1239 | if (r < 0) |
1240 | goto error; | |
1241 | ||
e5002702 TG |
1242 | r = sd_event_source_set_priority(client->receive_message, |
1243 | client->event_priority); | |
b25ef18b TG |
1244 | if (r < 0) |
1245 | goto error; | |
1246 | ||
356779df | 1247 | r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message"); |
9021bb9f TG |
1248 | if (r < 0) |
1249 | goto error; | |
1250 | ||
0af03ba5 TG |
1251 | error: |
1252 | if (r < 0) | |
1253 | client_stop(client, r); | |
1254 | ||
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static int client_initialize_time_events(sd_dhcp_client *client) { | |
1d1a3e0a | 1259 | uint64_t usec = 0; |
0af03ba5 TG |
1260 | int r; |
1261 | ||
1262 | assert(client); | |
1263 | assert(client->event); | |
1264 | ||
bdbb98d9 | 1265 | if (client->start_delay > 0) { |
8ecdcb55 | 1266 | assert_se(sd_event_now(client->event, clock_boottime_or_monotonic(), &usec) >= 0); |
1d1a3e0a BG |
1267 | usec += client->start_delay; |
1268 | } | |
1269 | ||
a3fa4287 YW |
1270 | r = event_reset_time(client->event, &client->timeout_resend, |
1271 | clock_boottime_or_monotonic(), | |
1272 | usec, 0, | |
1273 | client_timeout_resend, client, | |
1274 | client->event_priority, "dhcp4-resend-timer", true); | |
6a1cd41e PF |
1275 | if (r < 0) |
1276 | client_stop(client, r); | |
1277 | ||
1278 | return 0; | |
1279 | ||
1280 | } | |
1281 | ||
4b558378 | 1282 | static int client_initialize_events(sd_dhcp_client *client, sd_event_io_handler_t io_callback) { |
0af03ba5 TG |
1283 | client_initialize_io_events(client, io_callback); |
1284 | client_initialize_time_events(client); | |
1285 | ||
1286 | return 0; | |
1287 | } | |
1288 | ||
1d1a3e0a | 1289 | static int client_start_delayed(sd_dhcp_client *client) { |
0f941add PF |
1290 | int r; |
1291 | ||
1292 | assert_return(client, -EINVAL); | |
1293 | assert_return(client->event, -EINVAL); | |
2f8e7633 | 1294 | assert_return(client->ifindex > 0, -EINVAL); |
0f941add PF |
1295 | assert_return(client->fd < 0, -EBUSY); |
1296 | assert_return(client->xid == 0, -EINVAL); | |
a1140666 | 1297 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT), -EBUSY); |
0f941add PF |
1298 | |
1299 | client->xid = random_u32(); | |
1300 | ||
2f8e7633 | 1301 | r = dhcp_network_bind_raw_socket(client->ifindex, &client->link, |
76253e73 | 1302 | client->xid, client->mac_addr, |
9faed222 | 1303 | client->mac_addr_len, client->arp_type, client->port); |
0f941add PF |
1304 | if (r < 0) { |
1305 | client_stop(client, r); | |
1306 | return r; | |
1307 | } | |
0f941add | 1308 | client->fd = r; |
58ec2d3e | 1309 | |
3742095b | 1310 | if (IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT)) |
fa94c34b | 1311 | client->start_time = now(clock_boottime_or_monotonic()); |
0f941add | 1312 | |
0f941add PF |
1313 | return client_initialize_events(client, client_receive_message_raw); |
1314 | } | |
1315 | ||
1d1a3e0a BG |
1316 | static int client_start(sd_dhcp_client *client) { |
1317 | client->start_delay = 0; | |
1318 | return client_start_delayed(client); | |
1319 | } | |
1320 | ||
4b558378 | 1321 | static int client_timeout_expire(sd_event_source *s, uint64_t usec, void *userdata) { |
751246ee | 1322 | sd_dhcp_client *client = userdata; |
574cc928 | 1323 | DHCP_CLIENT_DONT_DESTROY(client); |
751246ee | 1324 | |
ee57a737 TG |
1325 | log_dhcp_client(client, "EXPIRED"); |
1326 | ||
03748142 | 1327 | client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); |
0f941add | 1328 | |
781ca7a1 | 1329 | /* lease was lost, start over if not freed or stopped in callback */ |
574cc928 | 1330 | if (client->state != DHCP_STATE_STOPPED) { |
e5b04c8d PF |
1331 | client_initialize(client); |
1332 | client_start(client); | |
1333 | } | |
751246ee | 1334 | |
51debc1e PF |
1335 | return 0; |
1336 | } | |
1337 | ||
5ee482df | 1338 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
3dd71400 | 1339 | sd_dhcp_client *client = userdata; |
574cc928 | 1340 | DHCP_CLIENT_DONT_DESTROY(client); |
3dd71400 PF |
1341 | int r; |
1342 | ||
a1140666 LP |
1343 | assert(client); |
1344 | ||
03e334a1 | 1345 | client->receive_message = sd_event_source_unref(client->receive_message); |
22fc2420 | 1346 | client->fd = asynchronous_close(client->fd); |
3dd71400 PF |
1347 | |
1348 | client->state = DHCP_STATE_REBINDING; | |
11793fcd | 1349 | client->attempt = 0; |
3dd71400 | 1350 | |
2f8e7633 | 1351 | r = dhcp_network_bind_raw_socket(client->ifindex, &client->link, |
76253e73 | 1352 | client->xid, client->mac_addr, |
9faed222 SS |
1353 | client->mac_addr_len, client->arp_type, |
1354 | client->port); | |
3dd71400 PF |
1355 | if (r < 0) { |
1356 | client_stop(client, r); | |
1357 | return 0; | |
1358 | } | |
3dd71400 PF |
1359 | client->fd = r; |
1360 | ||
d23c45bf | 1361 | return client_initialize_events(client, client_receive_message_raw); |
51debc1e PF |
1362 | } |
1363 | ||
4b558378 | 1364 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { |
aba26854 | 1365 | sd_dhcp_client *client = userdata; |
574cc928 | 1366 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 PF |
1367 | |
1368 | client->state = DHCP_STATE_RENEWING; | |
11793fcd | 1369 | client->attempt = 0; |
aba26854 | 1370 | |
0af03ba5 | 1371 | return client_initialize_time_events(client); |
51debc1e PF |
1372 | } |
1373 | ||
4b558378 | 1374 | static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, size_t len) { |
4afd3348 | 1375 | _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL; |
5ee482df | 1376 | int r; |
3e3d8f78 | 1377 | |
a6cc569e TG |
1378 | r = dhcp_lease_new(&lease); |
1379 | if (r < 0) | |
1380 | return r; | |
8c00042c | 1381 | |
e37f74a6 DW |
1382 | if (client->client_id_len) { |
1383 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1384 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1385 | client->client_id_len); |
1386 | if (r < 0) | |
1387 | return r; | |
1388 | } | |
1389 | ||
f693e9b3 | 1390 | r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease, NULL); |
9e64dd72 | 1391 | if (r != DHCP_OFFER) { |
6ff8806e | 1392 | log_dhcp_client(client, "received message was not an OFFER, ignoring"); |
5ee482df | 1393 | return -ENOMSG; |
9e64dd72 | 1394 | } |
8c00042c | 1395 | |
8e34a618 | 1396 | lease->next_server = offer->siaddr; |
e5002702 | 1397 | lease->address = offer->yiaddr; |
8c00042c | 1398 | |
0339cd77 LP |
1399 | if (lease->address == 0 || |
1400 | lease->server_address == 0 || | |
9e64dd72 | 1401 | lease->lifetime == 0) { |
0339cd77 | 1402 | log_dhcp_client(client, "received lease lacks address, server address or lease lifetime, ignoring"); |
5ee482df | 1403 | return -ENOMSG; |
9e64dd72 TG |
1404 | } |
1405 | ||
0339cd77 | 1406 | if (!lease->have_subnet_mask) { |
9e64dd72 TG |
1407 | r = dhcp_lease_set_default_subnet_mask(lease); |
1408 | if (r < 0) { | |
87ac8d99 ZJS |
1409 | log_dhcp_client(client, |
1410 | "received lease lacks subnet mask, " | |
1411 | "and a fallback one cannot be generated, ignoring"); | |
9e64dd72 TG |
1412 | return -ENOMSG; |
1413 | } | |
1414 | } | |
8c00042c | 1415 | |
6e00a806 | 1416 | sd_dhcp_lease_unref(client->lease); |
1cc6c93a | 1417 | client->lease = TAKE_PTR(lease); |
8c00042c | 1418 | |
727b5734 SS |
1419 | if (client_notify(client, SD_DHCP_CLIENT_EVENT_SELECTING) < 0) |
1420 | return -ENOMSG; | |
1421 | ||
ee57a737 TG |
1422 | log_dhcp_client(client, "OFFER"); |
1423 | ||
8c00042c | 1424 | return 0; |
8c00042c PF |
1425 | } |
1426 | ||
4b558378 | 1427 | static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force, size_t len) { |
615c1467 TG |
1428 | int r; |
1429 | ||
f693e9b3 | 1430 | r = dhcp_option_parse(force, len, NULL, NULL, NULL); |
615c1467 TG |
1431 | if (r != DHCP_FORCERENEW) |
1432 | return -ENOMSG; | |
1433 | ||
1434 | log_dhcp_client(client, "FORCERENEW"); | |
1435 | ||
1436 | return 0; | |
1437 | } | |
1438 | ||
3d9f6707 YW |
1439 | static bool lease_equal(const sd_dhcp_lease *a, const sd_dhcp_lease *b) { |
1440 | if (a->address != b->address) | |
1441 | return false; | |
1442 | ||
1443 | if (a->subnet_mask != b->subnet_mask) | |
1444 | return false; | |
1445 | ||
1446 | if (a->router_size != b->router_size) | |
1447 | return false; | |
1448 | ||
1449 | for (size_t i = 0; i < a->router_size; i++) | |
1450 | if (a->router[i].s_addr != b->router[i].s_addr) | |
1451 | return false; | |
1452 | ||
1453 | return true; | |
1454 | } | |
1455 | ||
4b558378 | 1456 | static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, size_t len) { |
4afd3348 | 1457 | _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL; |
f693e9b3 | 1458 | _cleanup_free_ char *error_message = NULL; |
5ee482df | 1459 | int r; |
3e3d8f78 | 1460 | |
a6cc569e TG |
1461 | r = dhcp_lease_new(&lease); |
1462 | if (r < 0) | |
1463 | return r; | |
3e3d8f78 | 1464 | |
e37f74a6 DW |
1465 | if (client->client_id_len) { |
1466 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1467 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1468 | client->client_id_len); |
1469 | if (r < 0) | |
1470 | return r; | |
1471 | } | |
1472 | ||
f693e9b3 | 1473 | r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease, &error_message); |
ee57a737 | 1474 | if (r == DHCP_NAK) { |
f693e9b3 | 1475 | log_dhcp_client(client, "NAK: %s", strna(error_message)); |
2d2349cc | 1476 | return -EADDRNOTAVAIL; |
ee57a737 | 1477 | } |
3e3d8f78 | 1478 | |
9e64dd72 | 1479 | if (r != DHCP_ACK) { |
6ff8806e | 1480 | log_dhcp_client(client, "received message was not an ACK, ignoring"); |
5ee482df | 1481 | return -ENOMSG; |
9e64dd72 | 1482 | } |
3e3d8f78 | 1483 | |
8e34a618 TG |
1484 | lease->next_server = ack->siaddr; |
1485 | ||
e5002702 | 1486 | lease->address = ack->yiaddr; |
3e3d8f78 PF |
1487 | |
1488 | if (lease->address == INADDR_ANY || | |
1489 | lease->server_address == INADDR_ANY || | |
9e64dd72 | 1490 | lease->lifetime == 0) { |
6ff8806e | 1491 | log_dhcp_client(client, "received lease lacks address, server " |
9e64dd72 | 1492 | "address or lease lifetime, ignoring"); |
5ee482df | 1493 | return -ENOMSG; |
9e64dd72 TG |
1494 | } |
1495 | ||
1496 | if (lease->subnet_mask == INADDR_ANY) { | |
1497 | r = dhcp_lease_set_default_subnet_mask(lease); | |
1498 | if (r < 0) { | |
87ac8d99 ZJS |
1499 | log_dhcp_client(client, |
1500 | "received lease lacks subnet mask, " | |
1501 | "and a fallback one cannot be generated, ignoring"); | |
9e64dd72 TG |
1502 | return -ENOMSG; |
1503 | } | |
1504 | } | |
3e3d8f78 | 1505 | |
03748142 | 1506 | r = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
3e3d8f78 | 1507 | if (client->lease) { |
3d9f6707 | 1508 | if (lease_equal(client->lease, lease)) |
03748142 | 1509 | r = SD_DHCP_CLIENT_EVENT_RENEW; |
3d9f6707 YW |
1510 | else |
1511 | r = SD_DHCP_CLIENT_EVENT_IP_CHANGE; | |
3e3d8f78 | 1512 | |
a6cc569e | 1513 | client->lease = sd_dhcp_lease_unref(client->lease); |
3e3d8f78 PF |
1514 | } |
1515 | ||
1cc6c93a | 1516 | client->lease = TAKE_PTR(lease); |
3e3d8f78 | 1517 | |
ee57a737 TG |
1518 | log_dhcp_client(client, "ACK"); |
1519 | ||
3e3d8f78 PF |
1520 | return r; |
1521 | } | |
1522 | ||
fbcd420a | 1523 | static uint64_t client_compute_timeout(sd_dhcp_client *client, uint32_t lifetime, double factor) { |
022446ad TG |
1524 | assert(client); |
1525 | assert(client->request_sent); | |
fbcd420a | 1526 | assert(lifetime > 0); |
022446ad | 1527 | |
fbcd420a LP |
1528 | if (lifetime > 3) |
1529 | lifetime -= 3; | |
1530 | else | |
1531 | lifetime = 0; | |
1532 | ||
1533 | return client->request_sent + (lifetime * USEC_PER_SEC * factor) + | |
9bf3b535 | 1534 | + (random_u32() & 0x1fffff); |
51debc1e PF |
1535 | } |
1536 | ||
022446ad TG |
1537 | static int client_set_lease_timeouts(sd_dhcp_client *client) { |
1538 | usec_t time_now; | |
1539 | uint64_t lifetime_timeout; | |
1540 | uint64_t t2_timeout; | |
1541 | uint64_t t1_timeout; | |
1542 | char time_string[FORMAT_TIMESPAN_MAX]; | |
5ee482df | 1543 | int r; |
51debc1e | 1544 | |
b25ef18b TG |
1545 | assert(client); |
1546 | assert(client->event); | |
022446ad TG |
1547 | assert(client->lease); |
1548 | assert(client->lease->lifetime); | |
51debc1e | 1549 | |
022446ad | 1550 | /* don't set timers for infinite leases */ |
a3fa4287 YW |
1551 | if (client->lease->lifetime == 0xffffffff) { |
1552 | (void) event_source_disable(client->timeout_t1); | |
1553 | (void) event_source_disable(client->timeout_t2); | |
1554 | (void) event_source_disable(client->timeout_expire); | |
1555 | ||
022446ad | 1556 | return 0; |
a3fa4287 | 1557 | } |
51debc1e | 1558 | |
fa94c34b | 1559 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
022446ad TG |
1560 | if (r < 0) |
1561 | return r; | |
1562 | assert(client->request_sent <= time_now); | |
1563 | ||
1564 | /* convert the various timeouts from relative (secs) to absolute (usecs) */ | |
1565 | lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1); | |
fbcd420a | 1566 | if (client->lease->t1 > 0 && client->lease->t2 > 0) { |
022446ad TG |
1567 | /* both T1 and T2 are given */ |
1568 | if (client->lease->t1 < client->lease->t2 && | |
1569 | client->lease->t2 < client->lease->lifetime) { | |
1570 | /* they are both valid */ | |
1571 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1572 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1573 | } else { | |
1574 | /* discard both */ | |
1575 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1576 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1577 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1578 | client->lease->t1 = client->lease->lifetime / 2; | |
1579 | } | |
fbcd420a | 1580 | } else if (client->lease->t2 > 0 && client->lease->t2 < client->lease->lifetime) { |
022446ad TG |
1581 | /* only T2 is given, and it is valid */ |
1582 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1583 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1584 | client->lease->t1 = client->lease->lifetime / 2; | |
1585 | if (t2_timeout <= t1_timeout) { | |
1586 | /* the computed T1 would be invalid, so discard T2 */ | |
1587 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1588 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1589 | } | |
fbcd420a | 1590 | } else if (client->lease->t1 > 0 && client->lease->t1 < client->lease->lifetime) { |
022446ad TG |
1591 | /* only T1 is given, and it is valid */ |
1592 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1593 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1594 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1595 | if (t2_timeout <= t1_timeout) { | |
1596 | /* the computed T2 would be invalid, so discard T1 */ | |
1597 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1598 | client->lease->t2 = client->lease->lifetime / 2; | |
1599 | } | |
1600 | } else { | |
1601 | /* fall back to the default timeouts */ | |
1602 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1603 | client->lease->t1 = client->lease->lifetime / 2; | |
1604 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1605 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1606 | } | |
51debc1e | 1607 | |
022446ad | 1608 | /* arm lifetime timeout */ |
a3fa4287 YW |
1609 | r = event_reset_time(client->event, &client->timeout_expire, |
1610 | clock_boottime_or_monotonic(), | |
1611 | lifetime_timeout, 10 * USEC_PER_MSEC, | |
1612 | client_timeout_expire, client, | |
1613 | client->event_priority, "dhcp4-lifetime", true); | |
9021bb9f TG |
1614 | if (r < 0) |
1615 | return r; | |
1616 | ||
022446ad | 1617 | log_dhcp_client(client, "lease expires in %s", |
ed19c567 | 1618 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_timeout - time_now, USEC_PER_SEC)); |
51debc1e | 1619 | |
022446ad TG |
1620 | /* don't arm earlier timeouts if this has already expired */ |
1621 | if (lifetime_timeout <= time_now) | |
1622 | return 0; | |
51debc1e | 1623 | |
022446ad | 1624 | /* arm T2 timeout */ |
a3fa4287 YW |
1625 | r = event_reset_time(client->event, &client->timeout_t2, |
1626 | clock_boottime_or_monotonic(), | |
1627 | t2_timeout, 10 * USEC_PER_MSEC, | |
1628 | client_timeout_t2, client, | |
1629 | client->event_priority, "dhcp4-t2-timeout", true); | |
9021bb9f TG |
1630 | if (r < 0) |
1631 | return r; | |
1632 | ||
022446ad | 1633 | log_dhcp_client(client, "T2 expires in %s", |
ed19c567 | 1634 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t2_timeout - time_now, USEC_PER_SEC)); |
022446ad TG |
1635 | |
1636 | /* don't arm earlier timeout if this has already expired */ | |
1637 | if (t2_timeout <= time_now) | |
1638 | return 0; | |
51debc1e | 1639 | |
022446ad | 1640 | /* arm T1 timeout */ |
a3fa4287 YW |
1641 | r = event_reset_time(client->event, &client->timeout_t1, |
1642 | clock_boottime_or_monotonic(), | |
1643 | t1_timeout, 10 * USEC_PER_MSEC, | |
1644 | client_timeout_t1, client, | |
1645 | client->event_priority, "dhcp4-t1-timer", true); | |
9021bb9f TG |
1646 | if (r < 0) |
1647 | return r; | |
1648 | ||
022446ad | 1649 | log_dhcp_client(client, "T1 expires in %s", |
ed19c567 | 1650 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t1_timeout - time_now, USEC_PER_SEC)); |
022446ad | 1651 | |
51debc1e PF |
1652 | return 0; |
1653 | } | |
1654 | ||
4b558378 | 1655 | static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, int len) { |
574cc928 | 1656 | DHCP_CLIENT_DONT_DESTROY(client); |
1d1a3e0a | 1657 | char time_string[FORMAT_TIMESPAN_MAX]; |
e5002702 | 1658 | int r = 0, notify_event = 0; |
8c00042c | 1659 | |
b25ef18b TG |
1660 | assert(client); |
1661 | assert(client->event); | |
e5002702 | 1662 | assert(message); |
b25ef18b | 1663 | |
8c00042c PF |
1664 | switch (client->state) { |
1665 | case DHCP_STATE_SELECTING: | |
1666 | ||
e5002702 TG |
1667 | r = client_handle_offer(client, message, len); |
1668 | if (r >= 0) { | |
8c00042c | 1669 | |
8c00042c | 1670 | client->state = DHCP_STATE_REQUESTING; |
11793fcd | 1671 | client->attempt = 0; |
e2dfc79f | 1672 | |
a3fa4287 YW |
1673 | r = event_reset_time(client->event, &client->timeout_resend, |
1674 | clock_boottime_or_monotonic(), | |
1675 | 0, 0, | |
1676 | client_timeout_resend, client, | |
1677 | client->event_priority, "dhcp4-resend-timer", true); | |
9021bb9f TG |
1678 | if (r < 0) |
1679 | goto error; | |
9e64dd72 TG |
1680 | } else if (r == -ENOMSG) |
1681 | /* invalid message, let's ignore it */ | |
1682 | return 0; | |
8c00042c PF |
1683 | |
1684 | break; | |
1685 | ||
8b1243f7 | 1686 | case DHCP_STATE_REBOOTING: |
3e3d8f78 | 1687 | case DHCP_STATE_REQUESTING: |
aba26854 | 1688 | case DHCP_STATE_RENEWING: |
3dd71400 | 1689 | case DHCP_STATE_REBINDING: |
aba26854 | 1690 | |
e5002702 | 1691 | r = client_handle_ack(client, message, len); |
2d2349cc | 1692 | if (r >= 0) { |
1d1a3e0a | 1693 | client->start_delay = 0; |
a3fa4287 | 1694 | (void) event_source_disable(client->timeout_resend); |
affaa94f DW |
1695 | client->receive_message = |
1696 | sd_event_source_unref(client->receive_message); | |
1697 | client->fd = asynchronous_close(client->fd); | |
3e3d8f78 | 1698 | |
8b1243f7 PF |
1699 | if (IN_SET(client->state, DHCP_STATE_REQUESTING, |
1700 | DHCP_STATE_REBOOTING)) | |
03748142 DH |
1701 | notify_event = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
1702 | else if (r != SD_DHCP_CLIENT_EVENT_IP_ACQUIRE) | |
aba26854 PF |
1703 | notify_event = r; |
1704 | ||
3e3d8f78 | 1705 | client->state = DHCP_STATE_BOUND; |
11793fcd | 1706 | client->attempt = 0; |
3e3d8f78 PF |
1707 | |
1708 | client->last_addr = client->lease->address; | |
1709 | ||
022446ad | 1710 | r = client_set_lease_timeouts(client); |
0411760a TG |
1711 | if (r < 0) { |
1712 | log_dhcp_client(client, "could not set lease timeouts"); | |
51debc1e | 1713 | goto error; |
0411760a | 1714 | } |
51debc1e | 1715 | |
afe42aef | 1716 | r = dhcp_network_bind_udp_socket(client->ifindex, client->lease->address, client->port, client->ip_service_type); |
0af03ba5 TG |
1717 | if (r < 0) { |
1718 | log_dhcp_client(client, "could not bind UDP socket"); | |
1719 | goto error; | |
1720 | } | |
1721 | ||
1722 | client->fd = r; | |
1723 | ||
1724 | client_initialize_io_events(client, client_receive_message_udp); | |
1725 | ||
e5b04c8d | 1726 | if (notify_event) { |
574cc928 TG |
1727 | client_notify(client, notify_event); |
1728 | if (client->state == DHCP_STATE_STOPPED) | |
e5b04c8d PF |
1729 | return 0; |
1730 | } | |
3e3d8f78 | 1731 | |
2d2349cc TG |
1732 | } else if (r == -EADDRNOTAVAIL) { |
1733 | /* got a NAK, let's restart the client */ | |
cc3981b1 LS |
1734 | client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); |
1735 | ||
2d2349cc TG |
1736 | r = client_initialize(client); |
1737 | if (r < 0) | |
1738 | goto error; | |
1739 | ||
1d1a3e0a | 1740 | r = client_start_delayed(client); |
2d2349cc TG |
1741 | if (r < 0) |
1742 | goto error; | |
1743 | ||
1d1a3e0a BG |
1744 | log_dhcp_client(client, "REBOOT in %s", format_timespan(time_string, FORMAT_TIMESPAN_MAX, |
1745 | client->start_delay, USEC_PER_SEC)); | |
1746 | ||
1747 | client->start_delay = CLAMP(client->start_delay * 2, | |
1748 | RESTART_AFTER_NAK_MIN_USEC, RESTART_AFTER_NAK_MAX_USEC); | |
2d2349cc TG |
1749 | |
1750 | return 0; | |
9e64dd72 TG |
1751 | } else if (r == -ENOMSG) |
1752 | /* invalid message, let's ignore it */ | |
1753 | return 0; | |
97b9372d | 1754 | |
3e3d8f78 PF |
1755 | break; |
1756 | ||
615c1467 TG |
1757 | case DHCP_STATE_BOUND: |
1758 | r = client_handle_forcerenew(client, message, len); | |
1759 | if (r >= 0) { | |
1760 | r = client_timeout_t1(NULL, 0, client); | |
1761 | if (r < 0) | |
1762 | goto error; | |
1763 | } else if (r == -ENOMSG) | |
1764 | /* invalid message, let's ignore it */ | |
1765 | return 0; | |
1766 | ||
1767 | break; | |
1768 | ||
8c00042c PF |
1769 | case DHCP_STATE_INIT: |
1770 | case DHCP_STATE_INIT_REBOOT: | |
8c00042c PF |
1771 | |
1772 | break; | |
781ca7a1 PF |
1773 | |
1774 | case DHCP_STATE_STOPPED: | |
1775 | r = -EINVAL; | |
1776 | goto error; | |
8c00042c PF |
1777 | } |
1778 | ||
1779 | error: | |
2d2349cc | 1780 | if (r < 0) |
e5b04c8d | 1781 | client_stop(client, r); |
e2dfc79f | 1782 | |
e5b04c8d | 1783 | return r; |
8c00042c PF |
1784 | } |
1785 | ||
4b558378 ZJS |
1786 | static int client_receive_message_udp( |
1787 | sd_event_source *s, | |
1788 | int fd, | |
1789 | uint32_t revents, | |
1790 | void *userdata) { | |
1791 | ||
e5002702 | 1792 | sd_dhcp_client *client = userdata; |
5266a81e | 1793 | _cleanup_free_ DHCPMessage *message = NULL; |
13f1fd03 | 1794 | const uint8_t *expected_chaddr = NULL; |
76253e73 | 1795 | uint8_t expected_hlen = 0; |
4edc2c9b | 1796 | ssize_t len, buflen; |
e5002702 TG |
1797 | |
1798 | assert(s); | |
1799 | assert(client); | |
e5002702 | 1800 | |
4edc2c9b | 1801 | buflen = next_datagram_size_fd(fd); |
22a3fd2d BG |
1802 | if (buflen == -ENETDOWN) { |
1803 | /* the link is down. Don't return an error or the I/O event | |
1804 | source will be disconnected and we won't be able to receive | |
1805 | packets again when the link comes back. */ | |
1806 | return 0; | |
1807 | } | |
4edc2c9b LP |
1808 | if (buflen < 0) |
1809 | return buflen; | |
5266a81e TG |
1810 | |
1811 | message = malloc0(buflen); | |
1812 | if (!message) | |
1813 | return -ENOMEM; | |
1814 | ||
cf447cb6 | 1815 | len = recv(fd, message, buflen, 0); |
0c79c68d | 1816 | if (len < 0) { |
22a3fd2d BG |
1817 | /* see comment above for why we shouldn't error out on ENETDOWN. */ |
1818 | if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN)) | |
0d43d2fc TG |
1819 | return 0; |
1820 | ||
25f027c5 ZJS |
1821 | return log_dhcp_client_errno(client, errno, |
1822 | "Could not receive message from UDP socket: %m"); | |
004845d1 LP |
1823 | } |
1824 | if ((size_t) len < sizeof(DHCPMessage)) { | |
0d43d2fc | 1825 | log_dhcp_client(client, "Too small to be a DHCP message: ignoring"); |
e5002702 | 1826 | return 0; |
9fbc2523 TG |
1827 | } |
1828 | ||
1829 | if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) { | |
0d43d2fc | 1830 | log_dhcp_client(client, "Not a DHCP message: ignoring"); |
9fbc2523 TG |
1831 | return 0; |
1832 | } | |
1833 | ||
1834 | if (message->op != BOOTREPLY) { | |
0d43d2fc | 1835 | log_dhcp_client(client, "Not a BOOTREPLY message: ignoring"); |
9fbc2523 TG |
1836 | return 0; |
1837 | } | |
1838 | ||
76253e73 | 1839 | if (message->htype != client->arp_type) { |
0d43d2fc | 1840 | log_dhcp_client(client, "Packet type does not match client type"); |
76253e73 DW |
1841 | return 0; |
1842 | } | |
1843 | ||
1844 | if (client->arp_type == ARPHRD_ETHER) { | |
1845 | expected_hlen = ETH_ALEN; | |
13f1fd03 | 1846 | expected_chaddr = &client->mac_addr[0]; |
76253e73 DW |
1847 | } |
1848 | ||
1849 | if (message->hlen != expected_hlen) { | |
0d43d2fc | 1850 | log_dhcp_client(client, "Unexpected packet hlen %d", message->hlen); |
9fbc2523 TG |
1851 | return 0; |
1852 | } | |
1853 | ||
13f1fd03 | 1854 | if (expected_hlen > 0 && memcmp(&message->chaddr[0], expected_chaddr, expected_hlen)) { |
0d43d2fc | 1855 | log_dhcp_client(client, "Received chaddr does not match expected: ignoring"); |
9fbc2523 TG |
1856 | return 0; |
1857 | } | |
e5002702 | 1858 | |
615c1467 TG |
1859 | if (client->state != DHCP_STATE_BOUND && |
1860 | be32toh(message->xid) != client->xid) { | |
1861 | /* in BOUND state, we may receive FORCERENEW with xid set by server, | |
1862 | so ignore the xid in this case */ | |
0d43d2fc | 1863 | log_dhcp_client(client, "Received xid (%u) does not match expected (%u): ignoring", |
615c1467 TG |
1864 | be32toh(message->xid), client->xid); |
1865 | return 0; | |
1866 | } | |
1867 | ||
022446ad | 1868 | return client_handle_message(client, message, len); |
e5002702 TG |
1869 | } |
1870 | ||
4b558378 ZJS |
1871 | static int client_receive_message_raw( |
1872 | sd_event_source *s, | |
1873 | int fd, | |
1874 | uint32_t revents, | |
1875 | void *userdata) { | |
1876 | ||
e5002702 | 1877 | sd_dhcp_client *client = userdata; |
5266a81e | 1878 | _cleanup_free_ DHCPPacket *packet = NULL; |
55dab2ed TG |
1879 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; |
1880 | struct iovec iov = {}; | |
1881 | struct msghdr msg = { | |
1882 | .msg_iov = &iov, | |
1883 | .msg_iovlen = 1, | |
1884 | .msg_control = cmsgbuf, | |
1885 | .msg_controllen = sizeof(cmsgbuf), | |
1886 | }; | |
1887 | struct cmsghdr *cmsg; | |
1888 | bool checksum = true; | |
4edc2c9b LP |
1889 | ssize_t buflen, len; |
1890 | int r; | |
e5002702 TG |
1891 | |
1892 | assert(s); | |
1893 | assert(client); | |
e5002702 | 1894 | |
4edc2c9b | 1895 | buflen = next_datagram_size_fd(fd); |
22a3fd2d BG |
1896 | if (buflen == -ENETDOWN) |
1897 | return 0; | |
4edc2c9b LP |
1898 | if (buflen < 0) |
1899 | return buflen; | |
5266a81e TG |
1900 | |
1901 | packet = malloc0(buflen); | |
1902 | if (!packet) | |
1903 | return -ENOMEM; | |
1904 | ||
cb310866 | 1905 | iov = IOVEC_MAKE(packet, buflen); |
55dab2ed | 1906 | |
a38d9945 | 1907 | len = recvmsg(fd, &msg, 0); |
55dab2ed | 1908 | if (len < 0) { |
22a3fd2d | 1909 | if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN)) |
0d43d2fc TG |
1910 | return 0; |
1911 | ||
25f027c5 ZJS |
1912 | return log_dhcp_client_errno(client, errno, |
1913 | "Could not receive message from raw socket: %m"); | |
0c79c68d TG |
1914 | } else if ((size_t)len < sizeof(DHCPPacket)) |
1915 | return 0; | |
55dab2ed | 1916 | |
e4a0fe63 | 1917 | CMSG_FOREACH(cmsg, &msg) |
48a4612e TG |
1918 | if (cmsg->cmsg_level == SOL_PACKET && |
1919 | cmsg->cmsg_type == PACKET_AUXDATA && | |
1920 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) { | |
1921 | struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg); | |
55dab2ed TG |
1922 | |
1923 | checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY); | |
1924 | break; | |
1925 | } | |
e5002702 | 1926 | |
9faed222 | 1927 | r = dhcp_packet_verify_headers(packet, len, checksum, client->port); |
ac4f16ab | 1928 | if (r < 0) |
9fadd4ca | 1929 | return 0; |
e5002702 TG |
1930 | |
1931 | len -= DHCP_IP_UDP_SIZE; | |
1932 | ||
022446ad | 1933 | return client_handle_message(client, &packet->dhcp, len); |
e5002702 TG |
1934 | } |
1935 | ||
1c9a2e26 YW |
1936 | int sd_dhcp_client_send_renew(sd_dhcp_client *client) { |
1937 | assert_return(client, -EINVAL); | |
1938 | assert_return(client->fd >= 0, -EINVAL); | |
1939 | ||
1940 | client->start_delay = 0; | |
1941 | client->attempt = 1; | |
1942 | client->state = DHCP_STATE_RENEWING; | |
1943 | ||
1944 | return client_initialize_time_events(client); | |
1945 | } | |
1946 | ||
5ee482df | 1947 | int sd_dhcp_client_start(sd_dhcp_client *client) { |
6a1cd41e | 1948 | int r; |
d3d8ac2f | 1949 | |
46a66b79 | 1950 | assert_return(client, -EINVAL); |
46a66b79 | 1951 | |
0f941add PF |
1952 | r = client_initialize(client); |
1953 | if (r < 0) | |
6a1cd41e | 1954 | return r; |
8c00042c | 1955 | |
66173db7 | 1956 | /* RFC7844 section 3.3: |
1957 | SHOULD perform a complete four-way handshake, starting with a | |
1958 | DHCPDISCOVER, to obtain a new address lease. If the client can | |
1959 | ascertain that this is exactly the same network to which it was | |
1960 | previously connected, and if the link-layer address did not change, | |
1961 | the client MAY issue a DHCPREQUEST to try to reclaim the current | |
1962 | address. */ | |
1963 | if (client->last_addr && !client->anonymize) | |
0f941add | 1964 | client->state = DHCP_STATE_INIT_REBOOT; |
d3d8ac2f | 1965 | |
998d8047 TG |
1966 | r = client_start(client); |
1967 | if (r >= 0) | |
2f8e7633 | 1968 | log_dhcp_client(client, "STARTED on ifindex %i", client->ifindex); |
998d8047 TG |
1969 | |
1970 | return r; | |
46a66b79 PF |
1971 | } |
1972 | ||
1501b429 SS |
1973 | int sd_dhcp_client_send_release(sd_dhcp_client *client) { |
1974 | assert_return(client, -EINVAL); | |
8ff4585f | 1975 | assert_return(client->state != DHCP_STATE_STOPPED, -ESTALE); |
8bea7e70 | 1976 | assert_return(client->lease, -EUNATCH); |
8ff4585f ZJS |
1977 | |
1978 | _cleanup_free_ DHCPPacket *release = NULL; | |
1979 | size_t optoffset, optlen; | |
1980 | int r; | |
1981 | ||
1982 | r = client_message_init(client, &release, DHCP_RELEASE, &optlen, &optoffset); | |
1983 | if (r < 0) | |
1984 | return r; | |
1985 | ||
1986 | /* Fill up release IP and MAC */ | |
1987 | release->dhcp.ciaddr = client->lease->address; | |
1988 | memcpy(&release->dhcp.chaddr, &client->mac_addr, client->mac_addr_len); | |
1501b429 | 1989 | |
8ff4585f ZJS |
1990 | r = dhcp_option_append(&release->dhcp, optlen, &optoffset, 0, |
1991 | SD_DHCP_OPTION_END, 0, NULL); | |
1992 | if (r < 0) | |
1993 | return r; | |
1994 | ||
1995 | r = dhcp_network_send_udp_socket(client->fd, | |
1996 | client->lease->server_address, | |
1997 | DHCP_PORT_SERVER, | |
1998 | &release->dhcp, | |
1999 | sizeof(DHCPMessage) + optoffset); | |
2000 | if (r < 0) | |
2001 | return r; | |
2002 | ||
2003 | log_dhcp_client(client, "RELEASE"); | |
1501b429 SS |
2004 | |
2005 | return 0; | |
2006 | } | |
2007 | ||
5ee482df | 2008 | int sd_dhcp_client_stop(sd_dhcp_client *client) { |
574cc928 TG |
2009 | DHCP_CLIENT_DONT_DESTROY(client); |
2010 | ||
e5b04c8d PF |
2011 | assert_return(client, -EINVAL); |
2012 | ||
03748142 | 2013 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
574cc928 | 2014 | client->state = DHCP_STATE_STOPPED; |
e5b04c8d PF |
2015 | |
2016 | return 0; | |
bbdf06d9 PF |
2017 | } |
2018 | ||
32d20645 | 2019 | int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int64_t priority) { |
b25ef18b TG |
2020 | int r; |
2021 | ||
2022 | assert_return(client, -EINVAL); | |
2023 | assert_return(!client->event, -EBUSY); | |
2024 | ||
2025 | if (event) | |
2026 | client->event = sd_event_ref(event); | |
2027 | else { | |
2028 | r = sd_event_default(&client->event); | |
2029 | if (r < 0) | |
2030 | return 0; | |
2031 | } | |
2032 | ||
2033 | client->event_priority = priority; | |
2034 | ||
2035 | return 0; | |
2036 | } | |
2037 | ||
2038 | int sd_dhcp_client_detach_event(sd_dhcp_client *client) { | |
2039 | assert_return(client, -EINVAL); | |
2040 | ||
2041 | client->event = sd_event_unref(client->event); | |
2042 | ||
2043 | return 0; | |
2044 | } | |
2045 | ||
2046 | sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { | |
a1140666 | 2047 | assert_return(client, NULL); |
b25ef18b TG |
2048 | |
2049 | return client->event; | |
2050 | } | |
2051 | ||
8301aa0b YW |
2052 | static sd_dhcp_client *dhcp_client_free(sd_dhcp_client *client) { |
2053 | assert(client); | |
e5b04c8d | 2054 | |
3733eec3 | 2055 | log_dhcp_client(client, "FREE"); |
6e00a806 | 2056 | |
a3fa4287 YW |
2057 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
2058 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); | |
2059 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
2060 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
3733eec3 | 2061 | |
a3fa4287 | 2062 | client_initialize(client); |
3733eec3 LP |
2063 | |
2064 | sd_dhcp_client_detach_event(client); | |
2065 | ||
2066 | sd_dhcp_lease_unref(client->lease); | |
2067 | ||
2068 | free(client->req_opts); | |
2069 | free(client->hostname); | |
2070 | free(client->vendor_class_identifier); | |
af1c0de0 | 2071 | client->user_class = strv_free(client->user_class); |
cb29c156 | 2072 | ordered_hashmap_free(client->options); |
6b430fdb | 2073 | return mfree(client); |
d2fe46b5 PF |
2074 | } |
2075 | ||
8301aa0b YW |
2076 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_client, sd_dhcp_client, dhcp_client_free); |
2077 | ||
db3d2358 | 2078 | int sd_dhcp_client_new(sd_dhcp_client **ret, int anonymize) { |
4afd3348 | 2079 | _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = NULL; |
011feef8 | 2080 | |
b25ef18b | 2081 | assert_return(ret, -EINVAL); |
d3d8ac2f | 2082 | |
be6bf4a7 | 2083 | client = new(sd_dhcp_client, 1); |
011feef8 | 2084 | if (!client) |
b25ef18b | 2085 | return -ENOMEM; |
011feef8 | 2086 | |
be6bf4a7 YW |
2087 | *client = (sd_dhcp_client) { |
2088 | .n_ref = 1, | |
2089 | .state = DHCP_STATE_INIT, | |
2090 | .ifindex = -1, | |
2091 | .fd = -1, | |
be6bf4a7 YW |
2092 | .mtu = DHCP_DEFAULT_MIN_SIZE, |
2093 | .port = DHCP_PORT_CLIENT, | |
2094 | .anonymize = !!anonymize, | |
715cedfb | 2095 | .max_attempts = (uint64_t) -1, |
afe42aef | 2096 | .ip_service_type = -1, |
be6bf4a7 | 2097 | }; |
db3d2358 | 2098 | /* NOTE: this could be moved to a function. */ |
2099 | if (anonymize) { | |
2100 | client->req_opts_size = ELEMENTSOF(default_req_opts_anonymize); | |
2101 | client->req_opts = memdup(default_req_opts_anonymize, client->req_opts_size); | |
2102 | } else { | |
2103 | client->req_opts_size = ELEMENTSOF(default_req_opts); | |
2104 | client->req_opts = memdup(default_req_opts, client->req_opts_size); | |
2105 | } | |
b25ef18b TG |
2106 | if (!client->req_opts) |
2107 | return -ENOMEM; | |
2108 | ||
1cc6c93a | 2109 | *ret = TAKE_PTR(client); |
011feef8 | 2110 | |
b25ef18b | 2111 | return 0; |
011feef8 | 2112 | } |