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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" |
07630cea LP |
27 | #include "random-util.h" |
28 | #include "string-util.h" | |
af1c0de0 | 29 | #include "strv.h" |
cb310866 | 30 | #include "util.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 | ||
011feef8 | 38 | struct sd_dhcp_client { |
3733eec3 | 39 | unsigned n_ref; |
e5b04c8d | 40 | |
011feef8 | 41 | DHCPState state; |
d3d8ac2f | 42 | sd_event *event; |
b25ef18b | 43 | int event_priority; |
d3d8ac2f | 44 | sd_event_source *timeout_resend; |
2f8e7633 | 45 | int ifindex; |
8c00042c | 46 | int fd; |
9faed222 | 47 | uint16_t port; |
8c00042c PF |
48 | union sockaddr_union link; |
49 | sd_event_source *receive_message; | |
f5de5b00 | 50 | bool request_broadcast; |
011feef8 | 51 | uint8_t *req_opts; |
7a7c74ca | 52 | size_t req_opts_allocated; |
011feef8 | 53 | size_t req_opts_size; |
db3d2358 | 54 | bool anonymize; |
3b349af6 | 55 | be32_t last_addr; |
76253e73 DW |
56 | uint8_t mac_addr[MAX_MAC_ADDR_LEN]; |
57 | size_t mac_addr_len; | |
58 | uint16_t arp_type; | |
5bac5235 TG |
59 | struct { |
60 | uint8_t type; | |
61 | union { | |
62 | struct { | |
63 | /* 0: Generic (non-LL) (RFC 2132) */ | |
64 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
65 | } _packed_ gen; | |
66 | struct { | |
67 | /* 1: Ethernet Link-Layer (RFC 2132) */ | |
68 | uint8_t haddr[ETH_ALEN]; | |
69 | } _packed_ eth; | |
70 | struct { | |
71 | /* 2 - 254: ARP/Link-Layer (RFC 2132) */ | |
72 | uint8_t haddr[0]; | |
73 | } _packed_ ll; | |
74 | struct { | |
75 | /* 255: Node-specific (RFC 4361) */ | |
413708d1 | 76 | be32_t iaid; |
5bac5235 TG |
77 | struct duid duid; |
78 | } _packed_ ns; | |
79 | struct { | |
80 | uint8_t data[MAX_CLIENT_ID_LEN]; | |
81 | } _packed_ raw; | |
82 | }; | |
83 | } _packed_ client_id; | |
ba6c0fd6 | 84 | size_t client_id_len; |
4cc7a82c | 85 | char *hostname; |
edb85f0d | 86 | char *vendor_class_identifier; |
af1c0de0 | 87 | char **user_class; |
324f8187 | 88 | uint32_t mtu; |
46a66b79 | 89 | uint32_t xid; |
d3d8ac2f | 90 | usec_t start_time; |
14cb109d | 91 | unsigned attempt; |
51debc1e PF |
92 | usec_t request_sent; |
93 | sd_event_source *timeout_t1; | |
94 | sd_event_source *timeout_t2; | |
95 | sd_event_source *timeout_expire; | |
45aa74c7 | 96 | sd_dhcp_client_callback_t callback; |
751246ee | 97 | void *userdata; |
a6cc569e | 98 | sd_dhcp_lease *lease; |
1d1a3e0a | 99 | usec_t start_delay; |
011feef8 PF |
100 | }; |
101 | ||
102 | static const uint8_t default_req_opts[] = { | |
22805d92 BG |
103 | SD_DHCP_OPTION_SUBNET_MASK, |
104 | SD_DHCP_OPTION_ROUTER, | |
105 | SD_DHCP_OPTION_HOST_NAME, | |
106 | SD_DHCP_OPTION_DOMAIN_NAME, | |
107 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, | |
011feef8 PF |
108 | }; |
109 | ||
db3d2358 | 110 | /* RFC7844 section 3: |
111 | MAY contain the Parameter Request List option. | |
112 | RFC7844 section 3.6: | |
113 | The client intending to protect its privacy SHOULD only request a | |
114 | minimal number of options in the PRL and SHOULD also randomly shuffle | |
115 | the ordering of option codes in the PRL. If this random ordering | |
116 | cannot be implemented, the client MAY order the option codes in the | |
117 | PRL by option code number (lowest to highest). | |
118 | */ | |
119 | /* NOTE: using PRL options that Windows 10 RFC7844 implementation uses */ | |
120 | static const uint8_t default_req_opts_anonymize[] = { | |
75924885 YW |
121 | SD_DHCP_OPTION_SUBNET_MASK, /* 1 */ |
122 | SD_DHCP_OPTION_ROUTER, /* 3 */ | |
123 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, /* 6 */ | |
124 | SD_DHCP_OPTION_DOMAIN_NAME, /* 15 */ | |
125 | SD_DHCP_OPTION_ROUTER_DISCOVER, /* 31 */ | |
126 | SD_DHCP_OPTION_STATIC_ROUTE, /* 33 */ | |
127 | SD_DHCP_OPTION_VENDOR_SPECIFIC, /* 43 */ | |
128 | SD_DHCP_OPTION_NETBIOS_NAMESERVER, /* 44 */ | |
129 | SD_DHCP_OPTION_NETBIOS_NODETYPE, /* 46 */ | |
130 | SD_DHCP_OPTION_NETBIOS_SCOPE, /* 47 */ | |
131 | SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE, /* 121 */ | |
132 | SD_DHCP_OPTION_PRIVATE_CLASSLESS_STATIC_ROUTE, /* 249 */ | |
133 | SD_DHCP_OPTION_PRIVATE_PROXY_AUTODISCOVERY, /* 252 */ | |
db3d2358 | 134 | }; |
135 | ||
4b558378 ZJS |
136 | static int client_receive_message_raw( |
137 | sd_event_source *s, | |
138 | int fd, | |
139 | uint32_t revents, | |
140 | void *userdata); | |
141 | static int client_receive_message_udp( | |
142 | sd_event_source *s, | |
143 | int fd, | |
144 | uint32_t revents, | |
145 | void *userdata); | |
574cc928 | 146 | static void client_stop(sd_dhcp_client *client, int error); |
aba26854 | 147 | |
4b558378 ZJS |
148 | int sd_dhcp_client_set_callback( |
149 | sd_dhcp_client *client, | |
150 | sd_dhcp_client_callback_t cb, | |
151 | void *userdata) { | |
45aa74c7 | 152 | |
751246ee PF |
153 | assert_return(client, -EINVAL); |
154 | ||
45aa74c7 | 155 | client->callback = cb; |
751246ee PF |
156 | client->userdata = userdata; |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
f5de5b00 TG |
161 | int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) { |
162 | assert_return(client, -EINVAL); | |
163 | ||
164 | client->request_broadcast = !!broadcast; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
5ee482df | 169 | int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) { |
011feef8 PF |
170 | size_t i; |
171 | ||
172 | assert_return(client, -EINVAL); | |
a1140666 | 173 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); |
011feef8 PF |
174 | |
175 | switch(option) { | |
a1140666 | 176 | |
22805d92 BG |
177 | case SD_DHCP_OPTION_PAD: |
178 | case SD_DHCP_OPTION_OVERLOAD: | |
179 | case SD_DHCP_OPTION_MESSAGE_TYPE: | |
180 | case SD_DHCP_OPTION_PARAMETER_REQUEST_LIST: | |
181 | case SD_DHCP_OPTION_END: | |
011feef8 PF |
182 | return -EINVAL; |
183 | ||
184 | default: | |
185 | break; | |
186 | } | |
187 | ||
188 | for (i = 0; i < client->req_opts_size; i++) | |
189 | if (client->req_opts[i] == option) | |
190 | return -EEXIST; | |
191 | ||
7a7c74ca | 192 | if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated, |
011feef8 PF |
193 | client->req_opts_size + 1)) |
194 | return -ENOMEM; | |
195 | ||
7a7c74ca | 196 | client->req_opts[client->req_opts_size++] = option; |
011feef8 PF |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
4b558378 ZJS |
201 | int sd_dhcp_client_set_request_address( |
202 | sd_dhcp_client *client, | |
203 | const struct in_addr *last_addr) { | |
a1140666 | 204 | |
011feef8 | 205 | assert_return(client, -EINVAL); |
a1140666 | 206 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); |
011feef8 PF |
207 | |
208 | if (last_addr) | |
209 | client->last_addr = last_addr->s_addr; | |
210 | else | |
211 | client->last_addr = INADDR_ANY; | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
2f8e7633 | 216 | int sd_dhcp_client_set_ifindex(sd_dhcp_client *client, int ifindex) { |
011feef8 | 217 | |
2f8e7633 LP |
218 | assert_return(client, -EINVAL); |
219 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY); | |
220 | assert_return(ifindex > 0, -EINVAL); | |
011feef8 | 221 | |
2f8e7633 | 222 | client->ifindex = ifindex; |
011feef8 PF |
223 | return 0; |
224 | } | |
225 | ||
4b558378 ZJS |
226 | int sd_dhcp_client_set_mac( |
227 | sd_dhcp_client *client, | |
228 | const uint8_t *addr, | |
229 | size_t addr_len, | |
230 | uint16_t arp_type) { | |
231 | ||
574cc928 | 232 | DHCP_CLIENT_DONT_DESTROY(client); |
4644fee0 TG |
233 | bool need_restart = false; |
234 | ||
46a66b79 | 235 | assert_return(client, -EINVAL); |
4644fee0 | 236 | assert_return(addr, -EINVAL); |
76253e73 DW |
237 | assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); |
238 | assert_return(arp_type > 0, -EINVAL); | |
239 | ||
240 | if (arp_type == ARPHRD_ETHER) | |
241 | assert_return(addr_len == ETH_ALEN, -EINVAL); | |
242 | else if (arp_type == ARPHRD_INFINIBAND) | |
243 | assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); | |
244 | else | |
245 | return -EINVAL; | |
46a66b79 | 246 | |
76253e73 DW |
247 | if (client->mac_addr_len == addr_len && |
248 | memcmp(&client->mac_addr, addr, addr_len) == 0) | |
4644fee0 TG |
249 | return 0; |
250 | ||
781ca7a1 | 251 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { |
a1140666 | 252 | log_dhcp_client(client, "Changing MAC address on running DHCP client, restarting"); |
4644fee0 | 253 | need_restart = true; |
03748142 | 254 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
4644fee0 | 255 | } |
02ec5cd7 | 256 | |
76253e73 DW |
257 | memcpy(&client->mac_addr, addr, addr_len); |
258 | client->mac_addr_len = addr_len; | |
259 | client->arp_type = arp_type; | |
260 | ||
ba6c0fd6 DW |
261 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
262 | sd_dhcp_client_start(client); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
4b558378 ZJS |
267 | int sd_dhcp_client_get_client_id( |
268 | sd_dhcp_client *client, | |
269 | uint8_t *type, | |
270 | const uint8_t **data, | |
271 | size_t *data_len) { | |
ba6c0fd6 DW |
272 | |
273 | assert_return(client, -EINVAL); | |
274 | assert_return(type, -EINVAL); | |
275 | assert_return(data, -EINVAL); | |
276 | assert_return(data_len, -EINVAL); | |
277 | ||
278 | *type = 0; | |
279 | *data = NULL; | |
280 | *data_len = 0; | |
281 | if (client->client_id_len) { | |
5bac5235 | 282 | *type = client->client_id.type; |
ba6c0fd6 | 283 | *data = client->client_id.raw.data; |
5bac5235 | 284 | *data_len = client->client_id_len - sizeof(client->client_id.type); |
ba6c0fd6 DW |
285 | } |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
4b558378 ZJS |
290 | int sd_dhcp_client_set_client_id( |
291 | sd_dhcp_client *client, | |
292 | uint8_t type, | |
293 | const uint8_t *data, | |
294 | size_t data_len) { | |
295 | ||
ba6c0fd6 DW |
296 | DHCP_CLIENT_DONT_DESTROY(client); |
297 | bool need_restart = false; | |
298 | ||
299 | assert_return(client, -EINVAL); | |
300 | assert_return(data, -EINVAL); | |
301 | assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL); | |
302 | ||
5bac5235 TG |
303 | if (client->client_id_len == data_len + sizeof(client->client_id.type) && |
304 | client->client_id.type == type && | |
ba6c0fd6 DW |
305 | memcmp(&client->client_id.raw.data, data, data_len) == 0) |
306 | return 0; | |
307 | ||
bfda0d0f TH |
308 | /* For hardware types, log debug message about unexpected data length. |
309 | * | |
310 | * Note that infiniband's INFINIBAND_ALEN is 20 bytes long, but only | |
311 | * last last 8 bytes of the address are stable and suitable to put into | |
312 | * the client-id. The caller is advised to account for that. */ | |
313 | if ((type == ARPHRD_ETHER && data_len != ETH_ALEN) || | |
314 | (type == ARPHRD_INFINIBAND && data_len != 8)) | |
315 | log_dhcp_client(client, "Changing client ID to hardware type %u with " | |
316 | "unexpected address length %zu", | |
317 | type, data_len); | |
318 | ||
ba6c0fd6 DW |
319 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { |
320 | log_dhcp_client(client, "Changing client ID on running DHCP " | |
321 | "client, restarting"); | |
322 | need_restart = true; | |
03748142 | 323 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
ba6c0fd6 DW |
324 | } |
325 | ||
5bac5235 | 326 | client->client_id.type = type; |
ba6c0fd6 | 327 | memcpy(&client->client_id.raw.data, data, data_len); |
5bac5235 | 328 | client->client_id_len = data_len + sizeof (client->client_id.type); |
46a66b79 | 329 | |
781ca7a1 | 330 | if (need_restart && client->state != DHCP_STATE_STOPPED) |
4644fee0 TG |
331 | sd_dhcp_client_start(client); |
332 | ||
46a66b79 PF |
333 | return 0; |
334 | } | |
335 | ||
d7df2fd3 ZJS |
336 | /** |
337 | * Sets IAID and DUID. If duid is non-null, the DUID is set to duid_type + duid | |
338 | * without further modification. Otherwise, if duid_type is supported, DUID | |
339 | * is set based on that type. Otherwise, an error is returned. | |
340 | */ | |
7e90a499 | 341 | static int dhcp_client_set_iaid_duid_internal( |
4b558378 | 342 | sd_dhcp_client *client, |
8217ed5e TH |
343 | bool iaid_append, |
344 | bool iaid_set, | |
4b558378 ZJS |
345 | uint32_t iaid, |
346 | uint16_t duid_type, | |
f7a92d1a | 347 | const void *duid, |
7e90a499 YW |
348 | size_t duid_len, |
349 | usec_t llt_time) { | |
4b558378 | 350 | |
413708d1 VK |
351 | DHCP_CLIENT_DONT_DESTROY(client); |
352 | int r; | |
d7df2fd3 ZJS |
353 | size_t len; |
354 | ||
413708d1 | 355 | assert_return(client, -EINVAL); |
da3c49e9 | 356 | assert_return(duid_len == 0 || duid, -EINVAL); |
d7df2fd3 | 357 | |
da3c49e9 | 358 | if (duid) { |
ab4a88bc | 359 | r = dhcp_validate_duid_len(duid_type, duid_len, true); |
d7df2fd3 ZJS |
360 | if (r < 0) |
361 | return r; | |
362 | } | |
413708d1 | 363 | |
d7df2fd3 | 364 | zero(client->client_id); |
413708d1 VK |
365 | client->client_id.type = 255; |
366 | ||
8217ed5e TH |
367 | if (iaid_append) { |
368 | if (iaid_set) | |
369 | client->client_id.ns.iaid = htobe32(iaid); | |
370 | else { | |
dace710c YW |
371 | r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, |
372 | client->mac_addr_len, | |
6d13616b | 373 | true, |
dace710c YW |
374 | &client->client_id.ns.iaid); |
375 | if (r < 0) | |
376 | return r; | |
8217ed5e | 377 | } |
dace710c | 378 | } |
413708d1 | 379 | |
da3c49e9 | 380 | if (duid) { |
413708d1 VK |
381 | client->client_id.ns.duid.type = htobe16(duid_type); |
382 | memcpy(&client->client_id.ns.duid.raw.data, duid, duid_len); | |
d7df2fd3 | 383 | len = sizeof(client->client_id.ns.duid.type) + duid_len; |
d7df2fd3 | 384 | } else |
27eba50e | 385 | switch (duid_type) { |
335f80a6 | 386 | case DUID_TYPE_LLT: |
339697f0 | 387 | if (client->mac_addr_len == 0) |
335f80a6 YW |
388 | return -EOPNOTSUPP; |
389 | ||
7e90a499 | 390 | 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 |
391 | if (r < 0) |
392 | return r; | |
393 | break; | |
27eba50e YW |
394 | case DUID_TYPE_EN: |
395 | r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &len); | |
396 | if (r < 0) | |
397 | return r; | |
398 | break; | |
335f80a6 | 399 | case DUID_TYPE_LL: |
339697f0 | 400 | if (client->mac_addr_len == 0) |
335f80a6 YW |
401 | return -EOPNOTSUPP; |
402 | ||
403 | r = dhcp_identifier_set_duid_ll(&client->client_id.ns.duid, client->mac_addr, client->mac_addr_len, client->arp_type, &len); | |
404 | if (r < 0) | |
405 | return r; | |
406 | break; | |
27eba50e YW |
407 | case DUID_TYPE_UUID: |
408 | r = dhcp_identifier_set_duid_uuid(&client->client_id.ns.duid, &len); | |
409 | if (r < 0) | |
410 | return r; | |
411 | break; | |
412 | default: | |
335f80a6 | 413 | return -EINVAL; |
27eba50e | 414 | } |
413708d1 | 415 | |
d7df2fd3 | 416 | client->client_id_len = sizeof(client->client_id.type) + len + |
8217ed5e | 417 | (iaid_append ? sizeof(client->client_id.ns.iaid) : 0); |
413708d1 VK |
418 | |
419 | if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { | |
8217ed5e | 420 | log_dhcp_client(client, "Configured %sDUID, restarting.", iaid_append ? "IAID+" : ""); |
413708d1 VK |
421 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
422 | sd_dhcp_client_start(client); | |
423 | } | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
dace710c YW |
428 | int sd_dhcp_client_set_iaid_duid( |
429 | sd_dhcp_client *client, | |
8217ed5e | 430 | bool iaid_set, |
dace710c YW |
431 | uint32_t iaid, |
432 | uint16_t duid_type, | |
433 | const void *duid, | |
434 | size_t duid_len) { | |
8217ed5e | 435 | return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, duid_type, duid, duid_len, 0); |
7e90a499 YW |
436 | } |
437 | ||
438 | int sd_dhcp_client_set_iaid_duid_llt( | |
439 | sd_dhcp_client *client, | |
8217ed5e | 440 | bool iaid_set, |
7e90a499 YW |
441 | uint32_t iaid, |
442 | usec_t llt_time) { | |
8217ed5e | 443 | return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, DUID_TYPE_LLT, NULL, 0, llt_time); |
dace710c YW |
444 | } |
445 | ||
446 | int sd_dhcp_client_set_duid( | |
447 | sd_dhcp_client *client, | |
448 | uint16_t duid_type, | |
449 | const void *duid, | |
450 | size_t duid_len) { | |
8217ed5e | 451 | return dhcp_client_set_iaid_duid_internal(client, false, false, 0, duid_type, duid, duid_len, 0); |
7e90a499 YW |
452 | } |
453 | ||
454 | int sd_dhcp_client_set_duid_llt( | |
455 | sd_dhcp_client *client, | |
456 | usec_t llt_time) { | |
8217ed5e | 457 | return dhcp_client_set_iaid_duid_internal(client, false, false, 0, DUID_TYPE_LLT, NULL, 0, llt_time); |
dace710c YW |
458 | } |
459 | ||
4b558378 ZJS |
460 | int sd_dhcp_client_set_hostname( |
461 | sd_dhcp_client *client, | |
462 | const char *hostname) { | |
463 | ||
4cc7a82c EY |
464 | assert_return(client, -EINVAL); |
465 | ||
9740eae6 | 466 | /* Make sure hostnames qualify as DNS and as Linux hostnames */ |
ef8b0084 | 467 | if (hostname && |
9740eae6 | 468 | !(hostname_is_valid(hostname, false) && dns_name_is_valid(hostname) > 0)) |
23873e25 BG |
469 | return -EINVAL; |
470 | ||
ef8b0084 | 471 | return free_and_strdup(&client->hostname, hostname); |
4cc7a82c EY |
472 | } |
473 | ||
4b558378 ZJS |
474 | int sd_dhcp_client_set_vendor_class_identifier( |
475 | sd_dhcp_client *client, | |
476 | const char *vci) { | |
477 | ||
edb85f0d SS |
478 | assert_return(client, -EINVAL); |
479 | ||
ef8b0084 | 480 | return free_and_strdup(&client->vendor_class_identifier, vci); |
edb85f0d SS |
481 | } |
482 | ||
af1c0de0 SS |
483 | int sd_dhcp_client_set_user_class( |
484 | sd_dhcp_client *client, | |
485 | const char* const* user_class) { | |
486 | ||
487 | _cleanup_strv_free_ char **s = NULL; | |
488 | char **p; | |
489 | ||
490 | STRV_FOREACH(p, (char **) user_class) | |
491 | if (strlen(*p) > 255) | |
492 | return -ENAMETOOLONG; | |
493 | ||
494 | s = strv_copy((char **) user_class); | |
495 | if (!s) | |
496 | return -ENOMEM; | |
497 | ||
498 | client->user_class = TAKE_PTR(s); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
9faed222 SS |
503 | int sd_dhcp_client_set_client_port( |
504 | sd_dhcp_client *client, | |
505 | uint16_t port) { | |
506 | ||
507 | assert_return(client, -EINVAL); | |
508 | ||
509 | client->port = port; | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
324f8187 TG |
514 | int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) { |
515 | assert_return(client, -EINVAL); | |
516 | assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE); | |
517 | ||
518 | client->mtu = mtu; | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
a6cc569e | 523 | int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) { |
751246ee | 524 | assert_return(client, -EINVAL); |
751246ee | 525 | |
ec2ce0c5 | 526 | if (!IN_SET(client->state, DHCP_STATE_BOUND, DHCP_STATE_RENEWING, DHCP_STATE_REBINDING)) |
a6cc569e | 527 | return -EADDRNOTAVAIL; |
751246ee | 528 | |
a1140666 LP |
529 | if (ret) |
530 | *ret = client->lease; | |
4f882b2a TG |
531 | |
532 | return 0; | |
533 | } | |
534 | ||
574cc928 | 535 | static void client_notify(sd_dhcp_client *client, int event) { |
45aa74c7 LP |
536 | assert(client); |
537 | ||
538 | if (client->callback) | |
539 | client->callback(client, event, client->userdata); | |
3e3d8f78 PF |
540 | } |
541 | ||
0f941add | 542 | static int client_initialize(sd_dhcp_client *client) { |
bbdf06d9 | 543 | assert_return(client, -EINVAL); |
bbdf06d9 | 544 | |
a1140666 | 545 | client->receive_message = sd_event_source_unref(client->receive_message); |
8c00042c | 546 | |
22fc2420 | 547 | client->fd = asynchronous_close(client->fd); |
8c00042c | 548 | |
a3fa4287 YW |
549 | (void) event_source_disable(client->timeout_resend); |
550 | (void) event_source_disable(client->timeout_t1); | |
551 | (void) event_source_disable(client->timeout_t2); | |
552 | (void) event_source_disable(client->timeout_expire); | |
51debc1e | 553 | |
e2dfc79f PF |
554 | client->attempt = 1; |
555 | ||
f8fdefe4 | 556 | client->state = DHCP_STATE_INIT; |
0f941add | 557 | client->xid = 0; |
bbdf06d9 | 558 | |
0339cd77 | 559 | client->lease = sd_dhcp_lease_unref(client->lease); |
8c00042c | 560 | |
0f941add PF |
561 | return 0; |
562 | } | |
563 | ||
574cc928 TG |
564 | static void client_stop(sd_dhcp_client *client, int error) { |
565 | assert(client); | |
0f941add | 566 | |
ccfdc9a1 UTL |
567 | if (error < 0) |
568 | log_dhcp_client(client, "STOPPED: %s", strerror(-error)); | |
03748142 | 569 | else if (error == SD_DHCP_CLIENT_EVENT_STOP) |
2d2349cc TG |
570 | log_dhcp_client(client, "STOPPED"); |
571 | else | |
572 | log_dhcp_client(client, "STOPPED: Unknown event"); | |
0f941add | 573 | |
574cc928 | 574 | client_notify(client, error); |
ee57a737 | 575 | |
574cc928 | 576 | client_initialize(client); |
bbdf06d9 PF |
577 | } |
578 | ||
4b558378 ZJS |
579 | static int client_message_init( |
580 | sd_dhcp_client *client, | |
581 | DHCPPacket **ret, | |
582 | uint8_t type, | |
583 | size_t *_optlen, | |
584 | size_t *_optoffset) { | |
585 | ||
3587161a | 586 | _cleanup_free_ DHCPPacket *packet = NULL; |
424a8732 | 587 | size_t optlen, optoffset, size; |
8a9e7616 | 588 | be16_t max_size; |
d8d74ef0 DW |
589 | usec_t time_now; |
590 | uint16_t secs; | |
cf597f65 | 591 | int r; |
46a66b79 | 592 | |
6236f49b | 593 | assert(client); |
d8d74ef0 | 594 | assert(client->start_time); |
424a8732 TG |
595 | assert(ret); |
596 | assert(_optlen); | |
597 | assert(_optoffset); | |
4c701096 | 598 | assert(IN_SET(type, DHCP_DISCOVER, DHCP_REQUEST)); |
0a1b6da8 | 599 | |
424a8732 TG |
600 | optlen = DHCP_MIN_OPTIONS_SIZE; |
601 | size = sizeof(DHCPPacket) + optlen; | |
602 | ||
603 | packet = malloc0(size); | |
604 | if (!packet) | |
605 | return -ENOMEM; | |
606 | ||
607 | r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type, | |
76253e73 | 608 | client->arp_type, optlen, &optoffset); |
cf597f65 TG |
609 | if (r < 0) |
610 | return r; | |
46a66b79 | 611 | |
0a1b6da8 TG |
612 | /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers |
613 | refuse to issue an DHCP lease if 'secs' is set to zero */ | |
d8d74ef0 DW |
614 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
615 | if (r < 0) | |
616 | return r; | |
617 | assert(time_now >= client->start_time); | |
618 | ||
619 | /* seconds between sending first and last DISCOVER | |
620 | * must always be strictly positive to deal with broken servers */ | |
621 | secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1; | |
622 | packet->dhcp.secs = htobe16(secs); | |
0a1b6da8 | 623 | |
63a07041 CA |
624 | /* RFC2132 section 4.1 |
625 | A client that cannot receive unicast IP datagrams until its protocol | |
626 | software has been configured with an IP address SHOULD set the | |
627 | BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or | |
628 | DHCPREQUEST messages that client sends. The BROADCAST bit will | |
629 | provide a hint to the DHCP server and BOOTP relay agent to broadcast | |
f5de5b00 TG |
630 | any messages to the client on the client's subnet. |
631 | ||
632 | Note: some interfaces needs this to be enabled, but some networks | |
633 | needs this to be disabled as broadcasts are filteretd, so this | |
634 | needs to be configurable */ | |
76253e73 | 635 | if (client->request_broadcast || client->arp_type != ARPHRD_ETHER) |
f5de5b00 | 636 | packet->dhcp.flags = htobe16(0x8000); |
63a07041 | 637 | |
50d6810e TG |
638 | /* RFC2132 section 4.1.1: |
639 | The client MUST include its hardware address in the ’chaddr’ field, if | |
76253e73 DW |
640 | necessary for delivery of DHCP reply messages. Non-Ethernet |
641 | interfaces will leave 'chaddr' empty and use the client identifier | |
642 | instead (eg, RFC 4390 section 2.1). | |
50d6810e | 643 | */ |
76253e73 DW |
644 | if (client->arp_type == ARPHRD_ETHER) |
645 | memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN); | |
f5a70de7 | 646 | |
afec4539 | 647 | /* If no client identifier exists, construct an RFC 4361-compliant one */ |
5bac5235 TG |
648 | if (client->client_id_len == 0) { |
649 | size_t duid_len; | |
650 | ||
651 | client->client_id.type = 255; | |
652 | ||
6d13616b TH |
653 | r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, |
654 | true, &client->client_id.ns.iaid); | |
5bac5235 TG |
655 | if (r < 0) |
656 | return r; | |
657 | ||
658 | r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &duid_len); | |
659 | if (r < 0) | |
660 | return r; | |
661 | ||
662 | client->client_id_len = sizeof(client->client_id.type) + sizeof(client->client_id.ns.iaid) + duid_len; | |
ba6c0fd6 DW |
663 | } |
664 | ||
ee57a737 | 665 | /* Some DHCP servers will refuse to issue an DHCP lease if the Client |
46a66b79 | 666 | Identifier option is not set */ |
ba6c0fd6 DW |
667 | if (client->client_id_len) { |
668 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, | |
22805d92 | 669 | SD_DHCP_OPTION_CLIENT_IDENTIFIER, |
ba6c0fd6 | 670 | client->client_id_len, |
5bac5235 | 671 | &client->client_id); |
ba6c0fd6 DW |
672 | if (r < 0) |
673 | return r; | |
674 | } | |
50d6810e TG |
675 | |
676 | /* RFC2131 section 3.5: | |
677 | in its initial DHCPDISCOVER or DHCPREQUEST message, a | |
678 | client may provide the server with a list of specific | |
679 | parameters the client is interested in. If the client | |
680 | includes a list of parameters in a DHCPDISCOVER message, | |
681 | it MUST include that list in any subsequent DHCPREQUEST | |
682 | messages. | |
683 | */ | |
5e77a146 | 684 | |
685 | /* RFC7844 section 3: | |
686 | MAY contain the Parameter Request List option. */ | |
687 | /* NOTE: in case that there would be an option to do not send | |
688 | * any PRL at all, the size should be checked before sending */ | |
689 | if (client->req_opts_size > 0) { | |
690 | r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0, | |
691 | SD_DHCP_OPTION_PARAMETER_REQUEST_LIST, | |
692 | client->req_opts_size, client->req_opts); | |
693 | if (r < 0) | |
694 | return r; | |
695 | } | |
8a9e7616 | 696 | |
50d6810e TG |
697 | /* RFC2131 section 3.5: |
698 | The client SHOULD include the ’maximum DHCP message size’ option to | |
699 | let the server know how large the server may make its DHCP messages. | |
700 | ||
701 | Note (from ConnMan): Some DHCP servers will send bigger DHCP packets | |
f21f31b2 | 702 | than the defined default size unless the Maximum Message Size option |
f131770b | 703 | is explicitly set |
324f8187 TG |
704 | |
705 | RFC3442 "Requirements to Avoid Sizing Constraints": | |
706 | Because a full routing table can be quite large, the standard 576 | |
707 | octet maximum size for a DHCP message may be too short to contain | |
708 | some legitimate Classless Static Route options. Because of this, | |
709 | clients implementing the Classless Static Route option SHOULD send a | |
710 | Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP | |
711 | stack is capable of receiving larger IP datagrams. In this case, the | |
712 | client SHOULD set the value of this option to at least the MTU of the | |
713 | interface that the client is configuring. The client MAY set the | |
714 | value of this option higher, up to the size of the largest UDP packet | |
715 | it is prepared to accept. (Note that the value specified in the | |
716 | Maximum DHCP Message Size option is the total maximum packet size, | |
717 | including IP and UDP headers.) | |
50d6810e | 718 | */ |
1b41b815 | 719 | /* RFC7844 section 3: |
720 | SHOULD NOT contain any other option. */ | |
721 | if (!client->anonymize) { | |
722 | max_size = htobe16(size); | |
723 | r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0, | |
724 | SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE, | |
725 | 2, &max_size); | |
726 | if (r < 0) | |
727 | return r; | |
728 | } | |
46a66b79 | 729 | |
424a8732 TG |
730 | *_optlen = optlen; |
731 | *_optoffset = optoffset; | |
1cc6c93a | 732 | *ret = TAKE_PTR(packet); |
424a8732 | 733 | |
46a66b79 PF |
734 | return 0; |
735 | } | |
736 | ||
4b558378 ZJS |
737 | static int client_append_fqdn_option( |
738 | DHCPMessage *message, | |
739 | size_t optlen, | |
740 | size_t *optoffset, | |
741 | const char *fqdn) { | |
742 | ||
23873e25 BG |
743 | uint8_t buffer[3 + DHCP_MAX_FQDN_LENGTH]; |
744 | int r; | |
745 | ||
746 | buffer[0] = DHCP_FQDN_FLAG_S | /* Request server to perform A RR DNS updates */ | |
747 | DHCP_FQDN_FLAG_E; /* Canonical wire format */ | |
748 | buffer[1] = 0; /* RCODE1 (deprecated) */ | |
749 | buffer[2] = 0; /* RCODE2 (deprecated) */ | |
750 | ||
3cd03457 | 751 | r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3, false); |
23873e25 BG |
752 | if (r > 0) |
753 | r = dhcp_option_append(message, optlen, optoffset, 0, | |
22805d92 | 754 | SD_DHCP_OPTION_FQDN, 3 + r, buffer); |
23873e25 BG |
755 | |
756 | return r; | |
757 | } | |
758 | ||
4b558378 ZJS |
759 | static int dhcp_client_send_raw( |
760 | sd_dhcp_client *client, | |
761 | DHCPPacket *packet, | |
762 | size_t len) { | |
763 | ||
9faed222 | 764 | dhcp_packet_append_ip_headers(packet, INADDR_ANY, client->port, |
63edaa62 TG |
765 | INADDR_BROADCAST, DHCP_PORT_SERVER, len); |
766 | ||
767 | return dhcp_network_send_raw_socket(client->fd, &client->link, | |
768 | packet, len); | |
769 | } | |
770 | ||
6236f49b | 771 | static int client_send_discover(sd_dhcp_client *client) { |
9f2a50a3 | 772 | _cleanup_free_ DHCPPacket *discover = NULL; |
424a8732 | 773 | size_t optoffset, optlen; |
6236f49b TG |
774 | int r; |
775 | ||
776 | assert(client); | |
4c701096 | 777 | assert(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_SELECTING)); |
50d6810e | 778 | |
424a8732 TG |
779 | r = client_message_init(client, &discover, DHCP_DISCOVER, |
780 | &optlen, &optoffset); | |
6236f49b TG |
781 | if (r < 0) |
782 | return r; | |
46a66b79 | 783 | |
50d6810e TG |
784 | /* the client may suggest values for the network address |
785 | and lease time in the DHCPDISCOVER message. The client may include | |
786 | the ’requested IP address’ option to suggest that a particular IP | |
787 | address be assigned, and may include the ’IP address lease time’ | |
788 | option to suggest the lease time it would like. | |
789 | */ | |
46a66b79 | 790 | if (client->last_addr != INADDR_ANY) { |
04b28be1 | 791 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
22805d92 | 792 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
20b958bf | 793 | 4, &client->last_addr); |
6236f49b TG |
794 | if (r < 0) |
795 | return r; | |
46a66b79 PF |
796 | } |
797 | ||
4cc7a82c | 798 | if (client->hostname) { |
23873e25 BG |
799 | /* According to RFC 4702 "clients that send the Client FQDN option in |
800 | their messages MUST NOT also send the Host Name option". Just send | |
801 | one of the two depending on the hostname type. | |
802 | */ | |
dc477e73 | 803 | if (dns_name_is_single_label(client->hostname)) { |
23873e25 BG |
804 | /* it is unclear from RFC 2131 if client should send hostname in |
805 | DHCPDISCOVER but dhclient does and so we do as well | |
806 | */ | |
807 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
22805d92 | 808 | SD_DHCP_OPTION_HOST_NAME, |
23873e25 BG |
809 | strlen(client->hostname), client->hostname); |
810 | } else | |
811 | r = client_append_fqdn_option(&discover->dhcp, optlen, &optoffset, | |
812 | client->hostname); | |
4cc7a82c EY |
813 | if (r < 0) |
814 | return r; | |
815 | } | |
816 | ||
edb85f0d SS |
817 | if (client->vendor_class_identifier) { |
818 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
22805d92 | 819 | SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, |
edb85f0d SS |
820 | strlen(client->vendor_class_identifier), |
821 | client->vendor_class_identifier); | |
822 | if (r < 0) | |
823 | return r; | |
824 | } | |
825 | ||
af1c0de0 SS |
826 | if (client->user_class) { |
827 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, | |
828 | SD_DHCP_OPTION_USER_CLASS, | |
829 | strv_length(client->user_class), | |
830 | client->user_class); | |
831 | if (r < 0) | |
832 | return r; | |
833 | } | |
834 | ||
04b28be1 | 835 | r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0, |
22805d92 | 836 | SD_DHCP_OPTION_END, 0, NULL); |
f7926298 TA |
837 | if (r < 0) |
838 | return r; | |
46a66b79 | 839 | |
50d6810e TG |
840 | /* We currently ignore: |
841 | The client SHOULD wait a random time between one and ten seconds to | |
842 | desynchronize the use of DHCP at startup. | |
843 | */ | |
20b958bf | 844 | r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset); |
6236f49b TG |
845 | if (r < 0) |
846 | return r; | |
e2dfc79f | 847 | |
ee57a737 TG |
848 | log_dhcp_client(client, "DISCOVER"); |
849 | ||
63edaa62 | 850 | return 0; |
e2dfc79f PF |
851 | } |
852 | ||
6236f49b | 853 | static int client_send_request(sd_dhcp_client *client) { |
8186d9dd | 854 | _cleanup_free_ DHCPPacket *request = NULL; |
424a8732 | 855 | size_t optoffset, optlen; |
6236f49b | 856 | int r; |
e2dfc79f | 857 | |
a1140666 LP |
858 | assert(client); |
859 | ||
860 | r = client_message_init(client, &request, DHCP_REQUEST, &optlen, &optoffset); | |
6236f49b TG |
861 | if (r < 0) |
862 | return r; | |
46a66b79 | 863 | |
8b1243f7 | 864 | switch (client->state) { |
50d6810e TG |
865 | /* See RFC2131 section 4.3.2 (note that there is a typo in the RFC, |
866 | SELECTING should be REQUESTING) | |
867 | */ | |
868 | ||
869 | case DHCP_STATE_REQUESTING: | |
870 | /* Client inserts the address of the selected server in ’server | |
871 | identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be | |
872 | filled in with the yiaddr value from the chosen DHCPOFFER. | |
873 | */ | |
8b1243f7 | 874 | |
04b28be1 | 875 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 876 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
50d6810e | 877 | 4, &client->lease->server_address); |
6236f49b TG |
878 | if (r < 0) |
879 | return r; | |
8b1243f7 | 880 | |
04b28be1 | 881 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 882 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
6236f49b TG |
883 | 4, &client->lease->address); |
884 | if (r < 0) | |
885 | return r; | |
886 | ||
50d6810e TG |
887 | break; |
888 | ||
889 | case DHCP_STATE_INIT_REBOOT: | |
890 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ | |
891 | option MUST be filled in with client’s notion of its previously | |
892 | assigned address. ’ciaddr’ MUST be zero. | |
893 | */ | |
04b28be1 | 894 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 895 | SD_DHCP_OPTION_REQUESTED_IP_ADDRESS, |
50d6810e | 896 | 4, &client->last_addr); |
6236f49b TG |
897 | if (r < 0) |
898 | return r; | |
8b1243f7 PF |
899 | break; |
900 | ||
8b1243f7 | 901 | case DHCP_STATE_RENEWING: |
50d6810e TG |
902 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
903 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
904 | client’s IP address. | |
905 | */ | |
906 | ||
8b1243f7 | 907 | case DHCP_STATE_REBINDING: |
50d6810e TG |
908 | /* ’server identifier’ MUST NOT be filled in, ’requested IP address’ |
909 | option MUST NOT be filled in, ’ciaddr’ MUST be filled in with | |
910 | client’s IP address. | |
911 | ||
912 | This message MUST be broadcast to the 0xffffffff IP broadcast address. | |
913 | */ | |
914 | request->dhcp.ciaddr = client->lease->address; | |
8b1243f7 PF |
915 | |
916 | break; | |
781ca7a1 | 917 | |
50d6810e TG |
918 | case DHCP_STATE_INIT: |
919 | case DHCP_STATE_SELECTING: | |
920 | case DHCP_STATE_REBOOTING: | |
921 | case DHCP_STATE_BOUND: | |
781ca7a1 PF |
922 | case DHCP_STATE_STOPPED: |
923 | return -EINVAL; | |
e2dfc79f | 924 | } |
46a66b79 | 925 | |
4cc7a82c | 926 | if (client->hostname) { |
dc477e73 | 927 | if (dns_name_is_single_label(client->hostname)) |
23873e25 | 928 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 929 | SD_DHCP_OPTION_HOST_NAME, |
23873e25 BG |
930 | strlen(client->hostname), client->hostname); |
931 | else | |
932 | r = client_append_fqdn_option(&request->dhcp, optlen, &optoffset, | |
933 | client->hostname); | |
4cc7a82c EY |
934 | if (r < 0) |
935 | return r; | |
936 | } | |
937 | ||
5153494f AG |
938 | if (client->vendor_class_identifier) { |
939 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, | |
940 | SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER, | |
941 | strlen(client->vendor_class_identifier), | |
942 | client->vendor_class_identifier); | |
943 | if (r < 0) | |
944 | return r; | |
945 | } | |
946 | ||
04b28be1 | 947 | r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0, |
22805d92 | 948 | SD_DHCP_OPTION_END, 0, NULL); |
6236f49b TG |
949 | if (r < 0) |
950 | return r; | |
46a66b79 | 951 | |
aba26854 | 952 | if (client->state == DHCP_STATE_RENEWING) { |
6236f49b TG |
953 | r = dhcp_network_send_udp_socket(client->fd, |
954 | client->lease->server_address, | |
955 | DHCP_PORT_SERVER, | |
956 | &request->dhcp, | |
20b958bf | 957 | sizeof(DHCPMessage) + optoffset); |
aba26854 | 958 | } else { |
20b958bf | 959 | r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset); |
aba26854 | 960 | } |
6236f49b TG |
961 | if (r < 0) |
962 | return r; | |
46a66b79 | 963 | |
998d8047 | 964 | switch (client->state) { |
a1140666 | 965 | |
998d8047 TG |
966 | case DHCP_STATE_REQUESTING: |
967 | log_dhcp_client(client, "REQUEST (requesting)"); | |
968 | break; | |
a1140666 | 969 | |
998d8047 TG |
970 | case DHCP_STATE_INIT_REBOOT: |
971 | log_dhcp_client(client, "REQUEST (init-reboot)"); | |
972 | break; | |
a1140666 | 973 | |
998d8047 TG |
974 | case DHCP_STATE_RENEWING: |
975 | log_dhcp_client(client, "REQUEST (renewing)"); | |
976 | break; | |
a1140666 | 977 | |
998d8047 TG |
978 | case DHCP_STATE_REBINDING: |
979 | log_dhcp_client(client, "REQUEST (rebinding)"); | |
980 | break; | |
a1140666 | 981 | |
998d8047 TG |
982 | default: |
983 | log_dhcp_client(client, "REQUEST (invalid)"); | |
984 | break; | |
985 | } | |
ee57a737 | 986 | |
63edaa62 | 987 | return 0; |
46a66b79 PF |
988 | } |
989 | ||
7739a40b TG |
990 | static int client_start(sd_dhcp_client *client); |
991 | ||
4b558378 ZJS |
992 | static int client_timeout_resend( |
993 | sd_event_source *s, | |
994 | uint64_t usec, | |
995 | void *userdata) { | |
996 | ||
d3d8ac2f | 997 | sd_dhcp_client *client = userdata; |
574cc928 | 998 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 | 999 | usec_t next_timeout = 0; |
d23c45bf | 1000 | uint64_t time_now; |
aba26854 | 1001 | uint32_t time_left; |
d23c45bf | 1002 | int r; |
b25ef18b TG |
1003 | |
1004 | assert(s); | |
1005 | assert(client); | |
1006 | assert(client->event); | |
d3d8ac2f | 1007 | |
fa94c34b | 1008 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
d23c45bf TG |
1009 | if (r < 0) |
1010 | goto error; | |
1011 | ||
aba26854 | 1012 | switch (client->state) { |
a1140666 | 1013 | |
aba26854 PF |
1014 | case DHCP_STATE_RENEWING: |
1015 | ||
e5002702 | 1016 | time_left = (client->lease->t2 - client->lease->t1) / 2; |
aba26854 PF |
1017 | if (time_left < 60) |
1018 | time_left = 60; | |
d3d8ac2f | 1019 | |
d23c45bf | 1020 | next_timeout = time_now + time_left * USEC_PER_SEC; |
d3d8ac2f | 1021 | |
aba26854 PF |
1022 | break; |
1023 | ||
3dd71400 PF |
1024 | case DHCP_STATE_REBINDING: |
1025 | ||
e5002702 | 1026 | time_left = (client->lease->lifetime - client->lease->t2) / 2; |
3dd71400 PF |
1027 | if (time_left < 60) |
1028 | time_left = 60; | |
1029 | ||
d23c45bf | 1030 | next_timeout = time_now + time_left * USEC_PER_SEC; |
3dd71400 PF |
1031 | break; |
1032 | ||
8b1243f7 PF |
1033 | case DHCP_STATE_REBOOTING: |
1034 | /* start over as we did not receive a timely ack or nak */ | |
7739a40b | 1035 | r = client_initialize(client); |
eb105b96 TG |
1036 | if (r < 0) |
1037 | goto error; | |
8b1243f7 | 1038 | |
998d8047 TG |
1039 | r = client_start(client); |
1040 | if (r < 0) | |
1041 | goto error; | |
1042 | else { | |
1043 | log_dhcp_client(client, "REBOOTED"); | |
1044 | return 0; | |
1045 | } | |
7739a40b | 1046 | |
aba26854 PF |
1047 | case DHCP_STATE_INIT: |
1048 | case DHCP_STATE_INIT_REBOOT: | |
aba26854 PF |
1049 | case DHCP_STATE_SELECTING: |
1050 | case DHCP_STATE_REQUESTING: | |
1051 | case DHCP_STATE_BOUND: | |
aba26854 PF |
1052 | |
1053 | if (client->attempt < 64) | |
1054 | client->attempt *= 2; | |
1055 | ||
d23c45bf | 1056 | next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC; |
aba26854 PF |
1057 | |
1058 | break; | |
781ca7a1 PF |
1059 | |
1060 | case DHCP_STATE_STOPPED: | |
1061 | r = -EINVAL; | |
1062 | goto error; | |
aba26854 PF |
1063 | } |
1064 | ||
9bf3b535 | 1065 | next_timeout += (random_u32() & 0x1fffff); |
d3d8ac2f | 1066 | |
a3fa4287 YW |
1067 | r = event_reset_time(client->event, &client->timeout_resend, |
1068 | clock_boottime_or_monotonic(), | |
1069 | next_timeout, 10 * USEC_PER_MSEC, | |
1070 | client_timeout_resend, client, | |
1071 | client->event_priority, "dhcp4-resend-timer", true); | |
9021bb9f TG |
1072 | if (r < 0) |
1073 | goto error; | |
1074 | ||
e2dfc79f PF |
1075 | switch (client->state) { |
1076 | case DHCP_STATE_INIT: | |
6236f49b | 1077 | r = client_send_discover(client); |
b25ef18b | 1078 | if (r >= 0) { |
e2dfc79f PF |
1079 | client->state = DHCP_STATE_SELECTING; |
1080 | client->attempt = 1; | |
1081 | } else { | |
1082 | if (client->attempt >= 64) | |
1083 | goto error; | |
1084 | } | |
1085 | ||
1086 | break; | |
1087 | ||
1088 | case DHCP_STATE_SELECTING: | |
6236f49b | 1089 | r = client_send_discover(client); |
b25ef18b | 1090 | if (r < 0 && client->attempt >= 64) |
d3d8ac2f PF |
1091 | goto error; |
1092 | ||
e2dfc79f PF |
1093 | break; |
1094 | ||
8b1243f7 | 1095 | case DHCP_STATE_INIT_REBOOT: |
e2dfc79f | 1096 | case DHCP_STATE_REQUESTING: |
aba26854 | 1097 | case DHCP_STATE_RENEWING: |
3dd71400 | 1098 | case DHCP_STATE_REBINDING: |
6236f49b | 1099 | r = client_send_request(client); |
b25ef18b | 1100 | if (r < 0 && client->attempt >= 64) |
e2dfc79f | 1101 | goto error; |
d3d8ac2f | 1102 | |
8b1243f7 PF |
1103 | if (client->state == DHCP_STATE_INIT_REBOOT) |
1104 | client->state = DHCP_STATE_REBOOTING; | |
1105 | ||
d23c45bf | 1106 | client->request_sent = time_now; |
51debc1e | 1107 | |
d3d8ac2f PF |
1108 | break; |
1109 | ||
d3d8ac2f | 1110 | case DHCP_STATE_REBOOTING: |
d3d8ac2f | 1111 | case DHCP_STATE_BOUND: |
d3d8ac2f PF |
1112 | |
1113 | break; | |
781ca7a1 PF |
1114 | |
1115 | case DHCP_STATE_STOPPED: | |
1116 | r = -EINVAL; | |
1117 | goto error; | |
d3d8ac2f PF |
1118 | } |
1119 | ||
1120 | return 0; | |
1121 | ||
1122 | error: | |
b25ef18b | 1123 | client_stop(client, r); |
d3d8ac2f PF |
1124 | |
1125 | /* Errors were dealt with when stopping the client, don't spill | |
1126 | errors into the event loop handler */ | |
1127 | return 0; | |
1128 | } | |
1129 | ||
4b558378 ZJS |
1130 | static int client_initialize_io_events( |
1131 | sd_dhcp_client *client, | |
1132 | sd_event_io_handler_t io_callback) { | |
1133 | ||
6a1cd41e PF |
1134 | int r; |
1135 | ||
b25ef18b TG |
1136 | assert(client); |
1137 | assert(client->event); | |
1138 | ||
151b9b96 LP |
1139 | r = sd_event_add_io(client->event, &client->receive_message, |
1140 | client->fd, EPOLLIN, io_callback, | |
1141 | client); | |
6a1cd41e PF |
1142 | if (r < 0) |
1143 | goto error; | |
1144 | ||
e5002702 TG |
1145 | r = sd_event_source_set_priority(client->receive_message, |
1146 | client->event_priority); | |
b25ef18b TG |
1147 | if (r < 0) |
1148 | goto error; | |
1149 | ||
356779df | 1150 | r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message"); |
9021bb9f TG |
1151 | if (r < 0) |
1152 | goto error; | |
1153 | ||
0af03ba5 TG |
1154 | error: |
1155 | if (r < 0) | |
1156 | client_stop(client, r); | |
1157 | ||
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | static int client_initialize_time_events(sd_dhcp_client *client) { | |
1d1a3e0a | 1162 | uint64_t usec = 0; |
0af03ba5 TG |
1163 | int r; |
1164 | ||
1165 | assert(client); | |
1166 | assert(client->event); | |
1167 | ||
1d1a3e0a | 1168 | if (client->start_delay) { |
8ecdcb55 | 1169 | assert_se(sd_event_now(client->event, clock_boottime_or_monotonic(), &usec) >= 0); |
1d1a3e0a BG |
1170 | usec += client->start_delay; |
1171 | } | |
1172 | ||
a3fa4287 YW |
1173 | r = event_reset_time(client->event, &client->timeout_resend, |
1174 | clock_boottime_or_monotonic(), | |
1175 | usec, 0, | |
1176 | client_timeout_resend, client, | |
1177 | client->event_priority, "dhcp4-resend-timer", true); | |
6a1cd41e PF |
1178 | if (r < 0) |
1179 | client_stop(client, r); | |
1180 | ||
1181 | return 0; | |
1182 | ||
1183 | } | |
1184 | ||
4b558378 | 1185 | static int client_initialize_events(sd_dhcp_client *client, sd_event_io_handler_t io_callback) { |
0af03ba5 TG |
1186 | client_initialize_io_events(client, io_callback); |
1187 | client_initialize_time_events(client); | |
1188 | ||
1189 | return 0; | |
1190 | } | |
1191 | ||
1d1a3e0a | 1192 | static int client_start_delayed(sd_dhcp_client *client) { |
0f941add PF |
1193 | int r; |
1194 | ||
1195 | assert_return(client, -EINVAL); | |
1196 | assert_return(client->event, -EINVAL); | |
2f8e7633 | 1197 | assert_return(client->ifindex > 0, -EINVAL); |
0f941add PF |
1198 | assert_return(client->fd < 0, -EBUSY); |
1199 | assert_return(client->xid == 0, -EINVAL); | |
a1140666 | 1200 | assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT), -EBUSY); |
0f941add PF |
1201 | |
1202 | client->xid = random_u32(); | |
1203 | ||
2f8e7633 | 1204 | r = dhcp_network_bind_raw_socket(client->ifindex, &client->link, |
76253e73 | 1205 | client->xid, client->mac_addr, |
9faed222 | 1206 | client->mac_addr_len, client->arp_type, client->port); |
0f941add PF |
1207 | if (r < 0) { |
1208 | client_stop(client, r); | |
1209 | return r; | |
1210 | } | |
0f941add | 1211 | client->fd = r; |
58ec2d3e | 1212 | |
3742095b | 1213 | if (IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT)) |
fa94c34b | 1214 | client->start_time = now(clock_boottime_or_monotonic()); |
0f941add | 1215 | |
0f941add PF |
1216 | return client_initialize_events(client, client_receive_message_raw); |
1217 | } | |
1218 | ||
1d1a3e0a BG |
1219 | static int client_start(sd_dhcp_client *client) { |
1220 | client->start_delay = 0; | |
1221 | return client_start_delayed(client); | |
1222 | } | |
1223 | ||
4b558378 | 1224 | static int client_timeout_expire(sd_event_source *s, uint64_t usec, void *userdata) { |
751246ee | 1225 | sd_dhcp_client *client = userdata; |
574cc928 | 1226 | DHCP_CLIENT_DONT_DESTROY(client); |
751246ee | 1227 | |
ee57a737 TG |
1228 | log_dhcp_client(client, "EXPIRED"); |
1229 | ||
03748142 | 1230 | client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); |
0f941add | 1231 | |
781ca7a1 | 1232 | /* lease was lost, start over if not freed or stopped in callback */ |
574cc928 | 1233 | if (client->state != DHCP_STATE_STOPPED) { |
e5b04c8d PF |
1234 | client_initialize(client); |
1235 | client_start(client); | |
1236 | } | |
751246ee | 1237 | |
51debc1e PF |
1238 | return 0; |
1239 | } | |
1240 | ||
5ee482df | 1241 | static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
3dd71400 | 1242 | sd_dhcp_client *client = userdata; |
574cc928 | 1243 | DHCP_CLIENT_DONT_DESTROY(client); |
3dd71400 PF |
1244 | int r; |
1245 | ||
a1140666 LP |
1246 | assert(client); |
1247 | ||
03e334a1 | 1248 | client->receive_message = sd_event_source_unref(client->receive_message); |
22fc2420 | 1249 | client->fd = asynchronous_close(client->fd); |
3dd71400 PF |
1250 | |
1251 | client->state = DHCP_STATE_REBINDING; | |
1252 | client->attempt = 1; | |
1253 | ||
2f8e7633 | 1254 | r = dhcp_network_bind_raw_socket(client->ifindex, &client->link, |
76253e73 | 1255 | client->xid, client->mac_addr, |
9faed222 SS |
1256 | client->mac_addr_len, client->arp_type, |
1257 | client->port); | |
3dd71400 PF |
1258 | if (r < 0) { |
1259 | client_stop(client, r); | |
1260 | return 0; | |
1261 | } | |
3dd71400 PF |
1262 | client->fd = r; |
1263 | ||
d23c45bf | 1264 | return client_initialize_events(client, client_receive_message_raw); |
51debc1e PF |
1265 | } |
1266 | ||
4b558378 | 1267 | static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { |
aba26854 | 1268 | sd_dhcp_client *client = userdata; |
574cc928 | 1269 | DHCP_CLIENT_DONT_DESTROY(client); |
aba26854 PF |
1270 | |
1271 | client->state = DHCP_STATE_RENEWING; | |
1272 | client->attempt = 1; | |
1273 | ||
0af03ba5 | 1274 | return client_initialize_time_events(client); |
51debc1e PF |
1275 | } |
1276 | ||
4b558378 | 1277 | static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, size_t len) { |
4afd3348 | 1278 | _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL; |
5ee482df | 1279 | int r; |
3e3d8f78 | 1280 | |
a6cc569e TG |
1281 | r = dhcp_lease_new(&lease); |
1282 | if (r < 0) | |
1283 | return r; | |
8c00042c | 1284 | |
e37f74a6 DW |
1285 | if (client->client_id_len) { |
1286 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1287 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1288 | client->client_id_len); |
1289 | if (r < 0) | |
1290 | return r; | |
1291 | } | |
1292 | ||
f693e9b3 | 1293 | r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease, NULL); |
9e64dd72 | 1294 | if (r != DHCP_OFFER) { |
6ff8806e | 1295 | log_dhcp_client(client, "received message was not an OFFER, ignoring"); |
5ee482df | 1296 | return -ENOMSG; |
9e64dd72 | 1297 | } |
8c00042c | 1298 | |
8e34a618 | 1299 | lease->next_server = offer->siaddr; |
e5002702 | 1300 | lease->address = offer->yiaddr; |
8c00042c | 1301 | |
0339cd77 LP |
1302 | if (lease->address == 0 || |
1303 | lease->server_address == 0 || | |
9e64dd72 | 1304 | lease->lifetime == 0) { |
0339cd77 | 1305 | log_dhcp_client(client, "received lease lacks address, server address or lease lifetime, ignoring"); |
5ee482df | 1306 | return -ENOMSG; |
9e64dd72 TG |
1307 | } |
1308 | ||
0339cd77 | 1309 | if (!lease->have_subnet_mask) { |
9e64dd72 TG |
1310 | r = dhcp_lease_set_default_subnet_mask(lease); |
1311 | if (r < 0) { | |
87ac8d99 ZJS |
1312 | log_dhcp_client(client, |
1313 | "received lease lacks subnet mask, " | |
1314 | "and a fallback one cannot be generated, ignoring"); | |
9e64dd72 TG |
1315 | return -ENOMSG; |
1316 | } | |
1317 | } | |
8c00042c | 1318 | |
6e00a806 | 1319 | sd_dhcp_lease_unref(client->lease); |
1cc6c93a | 1320 | client->lease = TAKE_PTR(lease); |
8c00042c | 1321 | |
ee57a737 TG |
1322 | log_dhcp_client(client, "OFFER"); |
1323 | ||
8c00042c | 1324 | return 0; |
8c00042c PF |
1325 | } |
1326 | ||
4b558378 | 1327 | static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force, size_t len) { |
615c1467 TG |
1328 | int r; |
1329 | ||
f693e9b3 | 1330 | r = dhcp_option_parse(force, len, NULL, NULL, NULL); |
615c1467 TG |
1331 | if (r != DHCP_FORCERENEW) |
1332 | return -ENOMSG; | |
1333 | ||
1334 | log_dhcp_client(client, "FORCERENEW"); | |
1335 | ||
1336 | return 0; | |
1337 | } | |
1338 | ||
4b558378 | 1339 | static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, size_t len) { |
4afd3348 | 1340 | _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL; |
f693e9b3 | 1341 | _cleanup_free_ char *error_message = NULL; |
5ee482df | 1342 | int r; |
3e3d8f78 | 1343 | |
a6cc569e TG |
1344 | r = dhcp_lease_new(&lease); |
1345 | if (r < 0) | |
1346 | return r; | |
3e3d8f78 | 1347 | |
e37f74a6 DW |
1348 | if (client->client_id_len) { |
1349 | r = dhcp_lease_set_client_id(lease, | |
5bac5235 | 1350 | (uint8_t *) &client->client_id, |
e37f74a6 DW |
1351 | client->client_id_len); |
1352 | if (r < 0) | |
1353 | return r; | |
1354 | } | |
1355 | ||
f693e9b3 | 1356 | r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease, &error_message); |
ee57a737 | 1357 | if (r == DHCP_NAK) { |
f693e9b3 | 1358 | log_dhcp_client(client, "NAK: %s", strna(error_message)); |
2d2349cc | 1359 | return -EADDRNOTAVAIL; |
ee57a737 | 1360 | } |
3e3d8f78 | 1361 | |
9e64dd72 | 1362 | if (r != DHCP_ACK) { |
6ff8806e | 1363 | log_dhcp_client(client, "received message was not an ACK, ignoring"); |
5ee482df | 1364 | return -ENOMSG; |
9e64dd72 | 1365 | } |
3e3d8f78 | 1366 | |
8e34a618 TG |
1367 | lease->next_server = ack->siaddr; |
1368 | ||
e5002702 | 1369 | lease->address = ack->yiaddr; |
3e3d8f78 PF |
1370 | |
1371 | if (lease->address == INADDR_ANY || | |
1372 | lease->server_address == INADDR_ANY || | |
9e64dd72 | 1373 | lease->lifetime == 0) { |
6ff8806e | 1374 | log_dhcp_client(client, "received lease lacks address, server " |
9e64dd72 | 1375 | "address or lease lifetime, ignoring"); |
5ee482df | 1376 | return -ENOMSG; |
9e64dd72 TG |
1377 | } |
1378 | ||
1379 | if (lease->subnet_mask == INADDR_ANY) { | |
1380 | r = dhcp_lease_set_default_subnet_mask(lease); | |
1381 | if (r < 0) { | |
87ac8d99 ZJS |
1382 | log_dhcp_client(client, |
1383 | "received lease lacks subnet mask, " | |
1384 | "and a fallback one cannot be generated, ignoring"); | |
9e64dd72 TG |
1385 | return -ENOMSG; |
1386 | } | |
1387 | } | |
3e3d8f78 | 1388 | |
03748142 | 1389 | r = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
3e3d8f78 PF |
1390 | if (client->lease) { |
1391 | if (client->lease->address != lease->address || | |
1392 | client->lease->subnet_mask != lease->subnet_mask || | |
1393 | client->lease->router != lease->router) { | |
03748142 | 1394 | r = SD_DHCP_CLIENT_EVENT_IP_CHANGE; |
68ceb9df | 1395 | } else |
03748142 | 1396 | r = SD_DHCP_CLIENT_EVENT_RENEW; |
3e3d8f78 | 1397 | |
a6cc569e | 1398 | client->lease = sd_dhcp_lease_unref(client->lease); |
3e3d8f78 PF |
1399 | } |
1400 | ||
1cc6c93a | 1401 | client->lease = TAKE_PTR(lease); |
3e3d8f78 | 1402 | |
ee57a737 TG |
1403 | log_dhcp_client(client, "ACK"); |
1404 | ||
3e3d8f78 PF |
1405 | return r; |
1406 | } | |
1407 | ||
fbcd420a | 1408 | static uint64_t client_compute_timeout(sd_dhcp_client *client, uint32_t lifetime, double factor) { |
022446ad TG |
1409 | assert(client); |
1410 | assert(client->request_sent); | |
fbcd420a | 1411 | assert(lifetime > 0); |
022446ad | 1412 | |
fbcd420a LP |
1413 | if (lifetime > 3) |
1414 | lifetime -= 3; | |
1415 | else | |
1416 | lifetime = 0; | |
1417 | ||
1418 | return client->request_sent + (lifetime * USEC_PER_SEC * factor) + | |
9bf3b535 | 1419 | + (random_u32() & 0x1fffff); |
51debc1e PF |
1420 | } |
1421 | ||
022446ad TG |
1422 | static int client_set_lease_timeouts(sd_dhcp_client *client) { |
1423 | usec_t time_now; | |
1424 | uint64_t lifetime_timeout; | |
1425 | uint64_t t2_timeout; | |
1426 | uint64_t t1_timeout; | |
1427 | char time_string[FORMAT_TIMESPAN_MAX]; | |
5ee482df | 1428 | int r; |
51debc1e | 1429 | |
b25ef18b TG |
1430 | assert(client); |
1431 | assert(client->event); | |
022446ad TG |
1432 | assert(client->lease); |
1433 | assert(client->lease->lifetime); | |
51debc1e | 1434 | |
022446ad | 1435 | /* don't set timers for infinite leases */ |
a3fa4287 YW |
1436 | if (client->lease->lifetime == 0xffffffff) { |
1437 | (void) event_source_disable(client->timeout_t1); | |
1438 | (void) event_source_disable(client->timeout_t2); | |
1439 | (void) event_source_disable(client->timeout_expire); | |
1440 | ||
022446ad | 1441 | return 0; |
a3fa4287 | 1442 | } |
51debc1e | 1443 | |
fa94c34b | 1444 | r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); |
022446ad TG |
1445 | if (r < 0) |
1446 | return r; | |
1447 | assert(client->request_sent <= time_now); | |
1448 | ||
1449 | /* convert the various timeouts from relative (secs) to absolute (usecs) */ | |
1450 | lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1); | |
fbcd420a | 1451 | if (client->lease->t1 > 0 && client->lease->t2 > 0) { |
022446ad TG |
1452 | /* both T1 and T2 are given */ |
1453 | if (client->lease->t1 < client->lease->t2 && | |
1454 | client->lease->t2 < client->lease->lifetime) { | |
1455 | /* they are both valid */ | |
1456 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1457 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1458 | } else { | |
1459 | /* discard both */ | |
1460 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1461 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1462 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1463 | client->lease->t1 = client->lease->lifetime / 2; | |
1464 | } | |
fbcd420a | 1465 | } else if (client->lease->t2 > 0 && client->lease->t2 < client->lease->lifetime) { |
022446ad TG |
1466 | /* only T2 is given, and it is valid */ |
1467 | t2_timeout = client_compute_timeout(client, client->lease->t2, 1); | |
1468 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1469 | client->lease->t1 = client->lease->lifetime / 2; | |
1470 | if (t2_timeout <= t1_timeout) { | |
1471 | /* the computed T1 would be invalid, so discard T2 */ | |
1472 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1473 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1474 | } | |
fbcd420a | 1475 | } else if (client->lease->t1 > 0 && client->lease->t1 < client->lease->lifetime) { |
022446ad TG |
1476 | /* only T1 is given, and it is valid */ |
1477 | t1_timeout = client_compute_timeout(client, client->lease->t1, 1); | |
1478 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1479 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1480 | if (t2_timeout <= t1_timeout) { | |
1481 | /* the computed T2 would be invalid, so discard T1 */ | |
1482 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1483 | client->lease->t2 = client->lease->lifetime / 2; | |
1484 | } | |
1485 | } else { | |
1486 | /* fall back to the default timeouts */ | |
1487 | t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5); | |
1488 | client->lease->t1 = client->lease->lifetime / 2; | |
1489 | t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0); | |
1490 | client->lease->t2 = (client->lease->lifetime * 7) / 8; | |
1491 | } | |
51debc1e | 1492 | |
022446ad | 1493 | /* arm lifetime timeout */ |
a3fa4287 YW |
1494 | r = event_reset_time(client->event, &client->timeout_expire, |
1495 | clock_boottime_or_monotonic(), | |
1496 | lifetime_timeout, 10 * USEC_PER_MSEC, | |
1497 | client_timeout_expire, client, | |
1498 | client->event_priority, "dhcp4-lifetime", true); | |
9021bb9f TG |
1499 | if (r < 0) |
1500 | return r; | |
1501 | ||
022446ad | 1502 | log_dhcp_client(client, "lease expires in %s", |
ed19c567 | 1503 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_timeout - time_now, USEC_PER_SEC)); |
51debc1e | 1504 | |
022446ad TG |
1505 | /* don't arm earlier timeouts if this has already expired */ |
1506 | if (lifetime_timeout <= time_now) | |
1507 | return 0; | |
51debc1e | 1508 | |
022446ad | 1509 | /* arm T2 timeout */ |
a3fa4287 YW |
1510 | r = event_reset_time(client->event, &client->timeout_t2, |
1511 | clock_boottime_or_monotonic(), | |
1512 | t2_timeout, 10 * USEC_PER_MSEC, | |
1513 | client_timeout_t2, client, | |
1514 | client->event_priority, "dhcp4-t2-timeout", true); | |
9021bb9f TG |
1515 | if (r < 0) |
1516 | return r; | |
1517 | ||
022446ad | 1518 | log_dhcp_client(client, "T2 expires in %s", |
ed19c567 | 1519 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t2_timeout - time_now, USEC_PER_SEC)); |
022446ad TG |
1520 | |
1521 | /* don't arm earlier timeout if this has already expired */ | |
1522 | if (t2_timeout <= time_now) | |
1523 | return 0; | |
51debc1e | 1524 | |
022446ad | 1525 | /* arm T1 timeout */ |
a3fa4287 YW |
1526 | r = event_reset_time(client->event, &client->timeout_t1, |
1527 | clock_boottime_or_monotonic(), | |
1528 | t1_timeout, 10 * USEC_PER_MSEC, | |
1529 | client_timeout_t1, client, | |
1530 | client->event_priority, "dhcp4-t1-timer", true); | |
9021bb9f TG |
1531 | if (r < 0) |
1532 | return r; | |
1533 | ||
022446ad | 1534 | log_dhcp_client(client, "T1 expires in %s", |
ed19c567 | 1535 | format_timespan(time_string, FORMAT_TIMESPAN_MAX, t1_timeout - time_now, USEC_PER_SEC)); |
022446ad | 1536 | |
51debc1e PF |
1537 | return 0; |
1538 | } | |
1539 | ||
4b558378 | 1540 | static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, int len) { |
574cc928 | 1541 | DHCP_CLIENT_DONT_DESTROY(client); |
1d1a3e0a | 1542 | char time_string[FORMAT_TIMESPAN_MAX]; |
e5002702 | 1543 | int r = 0, notify_event = 0; |
8c00042c | 1544 | |
b25ef18b TG |
1545 | assert(client); |
1546 | assert(client->event); | |
e5002702 | 1547 | assert(message); |
b25ef18b | 1548 | |
8c00042c PF |
1549 | switch (client->state) { |
1550 | case DHCP_STATE_SELECTING: | |
1551 | ||
e5002702 TG |
1552 | r = client_handle_offer(client, message, len); |
1553 | if (r >= 0) { | |
8c00042c | 1554 | |
8c00042c | 1555 | client->state = DHCP_STATE_REQUESTING; |
e2dfc79f PF |
1556 | client->attempt = 1; |
1557 | ||
a3fa4287 YW |
1558 | r = event_reset_time(client->event, &client->timeout_resend, |
1559 | clock_boottime_or_monotonic(), | |
1560 | 0, 0, | |
1561 | client_timeout_resend, client, | |
1562 | client->event_priority, "dhcp4-resend-timer", true); | |
9021bb9f TG |
1563 | if (r < 0) |
1564 | goto error; | |
9e64dd72 TG |
1565 | } else if (r == -ENOMSG) |
1566 | /* invalid message, let's ignore it */ | |
1567 | return 0; | |
8c00042c PF |
1568 | |
1569 | break; | |
1570 | ||
8b1243f7 | 1571 | case DHCP_STATE_REBOOTING: |
3e3d8f78 | 1572 | case DHCP_STATE_REQUESTING: |
aba26854 | 1573 | case DHCP_STATE_RENEWING: |
3dd71400 | 1574 | case DHCP_STATE_REBINDING: |
aba26854 | 1575 | |
e5002702 | 1576 | r = client_handle_ack(client, message, len); |
2d2349cc | 1577 | if (r >= 0) { |
1d1a3e0a | 1578 | client->start_delay = 0; |
a3fa4287 | 1579 | (void) event_source_disable(client->timeout_resend); |
affaa94f DW |
1580 | client->receive_message = |
1581 | sd_event_source_unref(client->receive_message); | |
1582 | client->fd = asynchronous_close(client->fd); | |
3e3d8f78 | 1583 | |
8b1243f7 PF |
1584 | if (IN_SET(client->state, DHCP_STATE_REQUESTING, |
1585 | DHCP_STATE_REBOOTING)) | |
03748142 DH |
1586 | notify_event = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE; |
1587 | else if (r != SD_DHCP_CLIENT_EVENT_IP_ACQUIRE) | |
aba26854 PF |
1588 | notify_event = r; |
1589 | ||
3e3d8f78 PF |
1590 | client->state = DHCP_STATE_BOUND; |
1591 | client->attempt = 1; | |
1592 | ||
1593 | client->last_addr = client->lease->address; | |
1594 | ||
022446ad | 1595 | r = client_set_lease_timeouts(client); |
0411760a TG |
1596 | if (r < 0) { |
1597 | log_dhcp_client(client, "could not set lease timeouts"); | |
51debc1e | 1598 | goto error; |
0411760a | 1599 | } |
51debc1e | 1600 | |
3e7b9f76 | 1601 | r = dhcp_network_bind_udp_socket(client->ifindex, client->lease->address, client->port); |
0af03ba5 TG |
1602 | if (r < 0) { |
1603 | log_dhcp_client(client, "could not bind UDP socket"); | |
1604 | goto error; | |
1605 | } | |
1606 | ||
1607 | client->fd = r; | |
1608 | ||
1609 | client_initialize_io_events(client, client_receive_message_udp); | |
1610 | ||
e5b04c8d | 1611 | if (notify_event) { |
574cc928 TG |
1612 | client_notify(client, notify_event); |
1613 | if (client->state == DHCP_STATE_STOPPED) | |
e5b04c8d PF |
1614 | return 0; |
1615 | } | |
3e3d8f78 | 1616 | |
2d2349cc TG |
1617 | } else if (r == -EADDRNOTAVAIL) { |
1618 | /* got a NAK, let's restart the client */ | |
cc3981b1 LS |
1619 | client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED); |
1620 | ||
2d2349cc TG |
1621 | r = client_initialize(client); |
1622 | if (r < 0) | |
1623 | goto error; | |
1624 | ||
1d1a3e0a | 1625 | r = client_start_delayed(client); |
2d2349cc TG |
1626 | if (r < 0) |
1627 | goto error; | |
1628 | ||
1d1a3e0a BG |
1629 | log_dhcp_client(client, "REBOOT in %s", format_timespan(time_string, FORMAT_TIMESPAN_MAX, |
1630 | client->start_delay, USEC_PER_SEC)); | |
1631 | ||
1632 | client->start_delay = CLAMP(client->start_delay * 2, | |
1633 | RESTART_AFTER_NAK_MIN_USEC, RESTART_AFTER_NAK_MAX_USEC); | |
2d2349cc TG |
1634 | |
1635 | return 0; | |
9e64dd72 TG |
1636 | } else if (r == -ENOMSG) |
1637 | /* invalid message, let's ignore it */ | |
1638 | return 0; | |
97b9372d | 1639 | |
3e3d8f78 PF |
1640 | break; |
1641 | ||
615c1467 TG |
1642 | case DHCP_STATE_BOUND: |
1643 | r = client_handle_forcerenew(client, message, len); | |
1644 | if (r >= 0) { | |
1645 | r = client_timeout_t1(NULL, 0, client); | |
1646 | if (r < 0) | |
1647 | goto error; | |
1648 | } else if (r == -ENOMSG) | |
1649 | /* invalid message, let's ignore it */ | |
1650 | return 0; | |
1651 | ||
1652 | break; | |
1653 | ||
8c00042c PF |
1654 | case DHCP_STATE_INIT: |
1655 | case DHCP_STATE_INIT_REBOOT: | |
8c00042c PF |
1656 | |
1657 | break; | |
781ca7a1 PF |
1658 | |
1659 | case DHCP_STATE_STOPPED: | |
1660 | r = -EINVAL; | |
1661 | goto error; | |
8c00042c PF |
1662 | } |
1663 | ||
1664 | error: | |
2d2349cc | 1665 | if (r < 0) |
e5b04c8d | 1666 | client_stop(client, r); |
e2dfc79f | 1667 | |
e5b04c8d | 1668 | return r; |
8c00042c PF |
1669 | } |
1670 | ||
4b558378 ZJS |
1671 | static int client_receive_message_udp( |
1672 | sd_event_source *s, | |
1673 | int fd, | |
1674 | uint32_t revents, | |
1675 | void *userdata) { | |
1676 | ||
e5002702 | 1677 | sd_dhcp_client *client = userdata; |
5266a81e | 1678 | _cleanup_free_ DHCPMessage *message = NULL; |
16f0b479 | 1679 | const struct ether_addr zero_mac = {}; |
3dc05554 | 1680 | const struct ether_addr *expected_chaddr = NULL; |
76253e73 | 1681 | uint8_t expected_hlen = 0; |
4edc2c9b | 1682 | ssize_t len, buflen; |
e5002702 TG |
1683 | |
1684 | assert(s); | |
1685 | assert(client); | |
e5002702 | 1686 | |
4edc2c9b LP |
1687 | buflen = next_datagram_size_fd(fd); |
1688 | if (buflen < 0) | |
1689 | return buflen; | |
5266a81e TG |
1690 | |
1691 | message = malloc0(buflen); | |
1692 | if (!message) | |
1693 | return -ENOMEM; | |
1694 | ||
cf447cb6 | 1695 | len = recv(fd, message, buflen, 0); |
0c79c68d | 1696 | if (len < 0) { |
4c701096 | 1697 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
1698 | return 0; |
1699 | ||
25f027c5 ZJS |
1700 | return log_dhcp_client_errno(client, errno, |
1701 | "Could not receive message from UDP socket: %m"); | |
004845d1 LP |
1702 | } |
1703 | if ((size_t) len < sizeof(DHCPMessage)) { | |
0d43d2fc | 1704 | log_dhcp_client(client, "Too small to be a DHCP message: ignoring"); |
e5002702 | 1705 | return 0; |
9fbc2523 TG |
1706 | } |
1707 | ||
1708 | if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) { | |
0d43d2fc | 1709 | log_dhcp_client(client, "Not a DHCP message: ignoring"); |
9fbc2523 TG |
1710 | return 0; |
1711 | } | |
1712 | ||
1713 | if (message->op != BOOTREPLY) { | |
0d43d2fc | 1714 | log_dhcp_client(client, "Not a BOOTREPLY message: ignoring"); |
9fbc2523 TG |
1715 | return 0; |
1716 | } | |
1717 | ||
76253e73 | 1718 | if (message->htype != client->arp_type) { |
0d43d2fc | 1719 | log_dhcp_client(client, "Packet type does not match client type"); |
76253e73 DW |
1720 | return 0; |
1721 | } | |
1722 | ||
1723 | if (client->arp_type == ARPHRD_ETHER) { | |
1724 | expected_hlen = ETH_ALEN; | |
3dc05554 | 1725 | expected_chaddr = (const struct ether_addr *) &client->mac_addr; |
76253e73 | 1726 | } else { |
a8eaaee7 | 1727 | /* Non-Ethernet links expect zero chaddr */ |
76253e73 | 1728 | expected_hlen = 0; |
3dc05554 | 1729 | expected_chaddr = &zero_mac; |
76253e73 DW |
1730 | } |
1731 | ||
1732 | if (message->hlen != expected_hlen) { | |
0d43d2fc | 1733 | log_dhcp_client(client, "Unexpected packet hlen %d", message->hlen); |
9fbc2523 TG |
1734 | return 0; |
1735 | } | |
1736 | ||
3dc05554 | 1737 | if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) { |
0d43d2fc | 1738 | log_dhcp_client(client, "Received chaddr does not match expected: ignoring"); |
9fbc2523 TG |
1739 | return 0; |
1740 | } | |
e5002702 | 1741 | |
615c1467 TG |
1742 | if (client->state != DHCP_STATE_BOUND && |
1743 | be32toh(message->xid) != client->xid) { | |
1744 | /* in BOUND state, we may receive FORCERENEW with xid set by server, | |
1745 | so ignore the xid in this case */ | |
0d43d2fc | 1746 | log_dhcp_client(client, "Received xid (%u) does not match expected (%u): ignoring", |
615c1467 TG |
1747 | be32toh(message->xid), client->xid); |
1748 | return 0; | |
1749 | } | |
1750 | ||
022446ad | 1751 | return client_handle_message(client, message, len); |
e5002702 TG |
1752 | } |
1753 | ||
4b558378 ZJS |
1754 | static int client_receive_message_raw( |
1755 | sd_event_source *s, | |
1756 | int fd, | |
1757 | uint32_t revents, | |
1758 | void *userdata) { | |
1759 | ||
e5002702 | 1760 | sd_dhcp_client *client = userdata; |
5266a81e | 1761 | _cleanup_free_ DHCPPacket *packet = NULL; |
55dab2ed TG |
1762 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))]; |
1763 | struct iovec iov = {}; | |
1764 | struct msghdr msg = { | |
1765 | .msg_iov = &iov, | |
1766 | .msg_iovlen = 1, | |
1767 | .msg_control = cmsgbuf, | |
1768 | .msg_controllen = sizeof(cmsgbuf), | |
1769 | }; | |
1770 | struct cmsghdr *cmsg; | |
1771 | bool checksum = true; | |
4edc2c9b LP |
1772 | ssize_t buflen, len; |
1773 | int r; | |
e5002702 TG |
1774 | |
1775 | assert(s); | |
1776 | assert(client); | |
e5002702 | 1777 | |
4edc2c9b LP |
1778 | buflen = next_datagram_size_fd(fd); |
1779 | if (buflen < 0) | |
1780 | return buflen; | |
5266a81e TG |
1781 | |
1782 | packet = malloc0(buflen); | |
1783 | if (!packet) | |
1784 | return -ENOMEM; | |
1785 | ||
cb310866 | 1786 | iov = IOVEC_MAKE(packet, buflen); |
55dab2ed | 1787 | |
a38d9945 | 1788 | len = recvmsg(fd, &msg, 0); |
55dab2ed | 1789 | if (len < 0) { |
4c701096 | 1790 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
1791 | return 0; |
1792 | ||
25f027c5 ZJS |
1793 | return log_dhcp_client_errno(client, errno, |
1794 | "Could not receive message from raw socket: %m"); | |
0c79c68d TG |
1795 | } else if ((size_t)len < sizeof(DHCPPacket)) |
1796 | return 0; | |
55dab2ed | 1797 | |
e4a0fe63 | 1798 | CMSG_FOREACH(cmsg, &msg) |
48a4612e TG |
1799 | if (cmsg->cmsg_level == SOL_PACKET && |
1800 | cmsg->cmsg_type == PACKET_AUXDATA && | |
1801 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) { | |
1802 | struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg); | |
55dab2ed TG |
1803 | |
1804 | checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY); | |
1805 | break; | |
1806 | } | |
e5002702 | 1807 | |
9faed222 | 1808 | r = dhcp_packet_verify_headers(packet, len, checksum, client->port); |
ac4f16ab | 1809 | if (r < 0) |
9fadd4ca | 1810 | return 0; |
e5002702 TG |
1811 | |
1812 | len -= DHCP_IP_UDP_SIZE; | |
1813 | ||
022446ad | 1814 | return client_handle_message(client, &packet->dhcp, len); |
e5002702 TG |
1815 | } |
1816 | ||
5ee482df | 1817 | int sd_dhcp_client_start(sd_dhcp_client *client) { |
6a1cd41e | 1818 | int r; |
d3d8ac2f | 1819 | |
46a66b79 | 1820 | assert_return(client, -EINVAL); |
46a66b79 | 1821 | |
0f941add PF |
1822 | r = client_initialize(client); |
1823 | if (r < 0) | |
6a1cd41e | 1824 | return r; |
8c00042c | 1825 | |
66173db7 | 1826 | /* RFC7844 section 3.3: |
1827 | SHOULD perform a complete four-way handshake, starting with a | |
1828 | DHCPDISCOVER, to obtain a new address lease. If the client can | |
1829 | ascertain that this is exactly the same network to which it was | |
1830 | previously connected, and if the link-layer address did not change, | |
1831 | the client MAY issue a DHCPREQUEST to try to reclaim the current | |
1832 | address. */ | |
1833 | if (client->last_addr && !client->anonymize) | |
0f941add | 1834 | client->state = DHCP_STATE_INIT_REBOOT; |
d3d8ac2f | 1835 | |
998d8047 TG |
1836 | r = client_start(client); |
1837 | if (r >= 0) | |
2f8e7633 | 1838 | log_dhcp_client(client, "STARTED on ifindex %i", client->ifindex); |
998d8047 TG |
1839 | |
1840 | return r; | |
46a66b79 PF |
1841 | } |
1842 | ||
5ee482df | 1843 | int sd_dhcp_client_stop(sd_dhcp_client *client) { |
574cc928 TG |
1844 | DHCP_CLIENT_DONT_DESTROY(client); |
1845 | ||
e5b04c8d PF |
1846 | assert_return(client, -EINVAL); |
1847 | ||
03748142 | 1848 | client_stop(client, SD_DHCP_CLIENT_EVENT_STOP); |
574cc928 | 1849 | client->state = DHCP_STATE_STOPPED; |
e5b04c8d PF |
1850 | |
1851 | return 0; | |
bbdf06d9 PF |
1852 | } |
1853 | ||
32d20645 | 1854 | int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int64_t priority) { |
b25ef18b TG |
1855 | int r; |
1856 | ||
1857 | assert_return(client, -EINVAL); | |
1858 | assert_return(!client->event, -EBUSY); | |
1859 | ||
1860 | if (event) | |
1861 | client->event = sd_event_ref(event); | |
1862 | else { | |
1863 | r = sd_event_default(&client->event); | |
1864 | if (r < 0) | |
1865 | return 0; | |
1866 | } | |
1867 | ||
1868 | client->event_priority = priority; | |
1869 | ||
1870 | return 0; | |
1871 | } | |
1872 | ||
1873 | int sd_dhcp_client_detach_event(sd_dhcp_client *client) { | |
1874 | assert_return(client, -EINVAL); | |
1875 | ||
1876 | client->event = sd_event_unref(client->event); | |
1877 | ||
1878 | return 0; | |
1879 | } | |
1880 | ||
1881 | sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) { | |
a1140666 | 1882 | assert_return(client, NULL); |
b25ef18b TG |
1883 | |
1884 | return client->event; | |
1885 | } | |
1886 | ||
8301aa0b YW |
1887 | static sd_dhcp_client *dhcp_client_free(sd_dhcp_client *client) { |
1888 | assert(client); | |
e5b04c8d | 1889 | |
3733eec3 | 1890 | log_dhcp_client(client, "FREE"); |
6e00a806 | 1891 | |
a3fa4287 YW |
1892 | client->timeout_resend = sd_event_source_unref(client->timeout_resend); |
1893 | client->timeout_t1 = sd_event_source_unref(client->timeout_t1); | |
1894 | client->timeout_t2 = sd_event_source_unref(client->timeout_t2); | |
1895 | client->timeout_expire = sd_event_source_unref(client->timeout_expire); | |
3733eec3 | 1896 | |
a3fa4287 | 1897 | client_initialize(client); |
3733eec3 LP |
1898 | |
1899 | sd_dhcp_client_detach_event(client); | |
1900 | ||
1901 | sd_dhcp_lease_unref(client->lease); | |
1902 | ||
1903 | free(client->req_opts); | |
1904 | free(client->hostname); | |
1905 | free(client->vendor_class_identifier); | |
af1c0de0 | 1906 | client->user_class = strv_free(client->user_class); |
6b430fdb | 1907 | return mfree(client); |
d2fe46b5 PF |
1908 | } |
1909 | ||
8301aa0b YW |
1910 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_client, sd_dhcp_client, dhcp_client_free); |
1911 | ||
db3d2358 | 1912 | int sd_dhcp_client_new(sd_dhcp_client **ret, int anonymize) { |
4afd3348 | 1913 | _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = NULL; |
011feef8 | 1914 | |
b25ef18b | 1915 | assert_return(ret, -EINVAL); |
d3d8ac2f | 1916 | |
be6bf4a7 | 1917 | client = new(sd_dhcp_client, 1); |
011feef8 | 1918 | if (!client) |
b25ef18b | 1919 | return -ENOMEM; |
011feef8 | 1920 | |
be6bf4a7 YW |
1921 | *client = (sd_dhcp_client) { |
1922 | .n_ref = 1, | |
1923 | .state = DHCP_STATE_INIT, | |
1924 | .ifindex = -1, | |
1925 | .fd = -1, | |
1926 | .attempt = 1, | |
1927 | .mtu = DHCP_DEFAULT_MIN_SIZE, | |
1928 | .port = DHCP_PORT_CLIENT, | |
1929 | .anonymize = !!anonymize, | |
1930 | }; | |
db3d2358 | 1931 | /* NOTE: this could be moved to a function. */ |
1932 | if (anonymize) { | |
1933 | client->req_opts_size = ELEMENTSOF(default_req_opts_anonymize); | |
1934 | client->req_opts = memdup(default_req_opts_anonymize, client->req_opts_size); | |
1935 | } else { | |
1936 | client->req_opts_size = ELEMENTSOF(default_req_opts); | |
1937 | client->req_opts = memdup(default_req_opts, client->req_opts_size); | |
1938 | } | |
b25ef18b TG |
1939 | if (!client->req_opts) |
1940 | return -ENOMEM; | |
1941 | ||
1cc6c93a | 1942 | *ret = TAKE_PTR(client); |
011feef8 | 1943 | |
b25ef18b | 1944 | return 0; |
011feef8 | 1945 | } |