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Merge pull request #14046 from poettering/id128-uuid
[thirdparty/systemd.git] / src / libsystemd-network / sd-dhcp-client.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
2 /***
3 Copyright © 2013 Intel Corporation. All rights reserved.
4 ***/
5
6 #include <errno.h>
7 #include <net/ethernet.h>
8 #include <net/if_arp.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <sys/ioctl.h>
12 #include <linux/if_infiniband.h>
13
14 #include "sd-dhcp-client.h"
15
16 #include "alloc-util.h"
17 #include "async.h"
18 #include "dhcp-identifier.h"
19 #include "dhcp-internal.h"
20 #include "dhcp-lease-internal.h"
21 #include "dhcp-protocol.h"
22 #include "dns-domain.h"
23 #include "event-util.h"
24 #include "hostname-util.h"
25 #include "io-util.h"
26 #include "memory-util.h"
27 #include "random-util.h"
28 #include "string-util.h"
29 #include "strv.h"
30
31 #define MAX_CLIENT_ID_LEN (sizeof(uint32_t) + MAX_DUID_LEN) /* Arbitrary limit */
32 #define MAX_MAC_ADDR_LEN CONST_MAX(INFINIBAND_ALEN, ETH_ALEN)
33
34 #define RESTART_AFTER_NAK_MIN_USEC (1 * USEC_PER_SEC)
35 #define RESTART_AFTER_NAK_MAX_USEC (30 * USEC_PER_MINUTE)
36
37 struct sd_dhcp_option {
38 unsigned n_ref;
39
40 uint8_t option;
41 void *data;
42 size_t length;
43 };
44
45 struct sd_dhcp_client {
46 unsigned n_ref;
47
48 DHCPState state;
49 sd_event *event;
50 int event_priority;
51 sd_event_source *timeout_resend;
52 int ifindex;
53 int fd;
54 uint16_t port;
55 union sockaddr_union link;
56 sd_event_source *receive_message;
57 bool request_broadcast;
58 uint8_t *req_opts;
59 size_t req_opts_allocated;
60 size_t req_opts_size;
61 bool anonymize;
62 be32_t last_addr;
63 uint8_t mac_addr[MAX_MAC_ADDR_LEN];
64 size_t mac_addr_len;
65 uint16_t arp_type;
66 struct {
67 uint8_t type;
68 union {
69 struct {
70 /* 0: Generic (non-LL) (RFC 2132) */
71 uint8_t data[MAX_CLIENT_ID_LEN];
72 } _packed_ gen;
73 struct {
74 /* 1: Ethernet Link-Layer (RFC 2132) */
75 uint8_t haddr[ETH_ALEN];
76 } _packed_ eth;
77 struct {
78 /* 2 - 254: ARP/Link-Layer (RFC 2132) */
79 uint8_t haddr[0];
80 } _packed_ ll;
81 struct {
82 /* 255: Node-specific (RFC 4361) */
83 be32_t iaid;
84 struct duid duid;
85 } _packed_ ns;
86 struct {
87 uint8_t data[MAX_CLIENT_ID_LEN];
88 } _packed_ raw;
89 };
90 } _packed_ client_id;
91 size_t client_id_len;
92 char *hostname;
93 char *vendor_class_identifier;
94 char **user_class;
95 uint32_t mtu;
96 uint32_t xid;
97 usec_t start_time;
98 uint64_t attempt;
99 uint64_t max_attempts;
100 OrderedHashmap *options;
101 usec_t request_sent;
102 sd_event_source *timeout_t1;
103 sd_event_source *timeout_t2;
104 sd_event_source *timeout_expire;
105 sd_dhcp_client_callback_t callback;
106 void *userdata;
107 sd_dhcp_lease *lease;
108 usec_t start_delay;
109 int ip_service_type;
110 };
111
112 static const uint8_t default_req_opts[] = {
113 SD_DHCP_OPTION_SUBNET_MASK,
114 SD_DHCP_OPTION_ROUTER,
115 SD_DHCP_OPTION_HOST_NAME,
116 SD_DHCP_OPTION_DOMAIN_NAME,
117 SD_DHCP_OPTION_DOMAIN_NAME_SERVER,
118 };
119
120 /* RFC7844 section 3:
121 MAY contain the Parameter Request List option.
122 RFC7844 section 3.6:
123 The client intending to protect its privacy SHOULD only request a
124 minimal number of options in the PRL and SHOULD also randomly shuffle
125 the ordering of option codes in the PRL. If this random ordering
126 cannot be implemented, the client MAY order the option codes in the
127 PRL by option code number (lowest to highest).
128 */
129 /* NOTE: using PRL options that Windows 10 RFC7844 implementation uses */
130 static const uint8_t default_req_opts_anonymize[] = {
131 SD_DHCP_OPTION_SUBNET_MASK, /* 1 */
132 SD_DHCP_OPTION_ROUTER, /* 3 */
133 SD_DHCP_OPTION_DOMAIN_NAME_SERVER, /* 6 */
134 SD_DHCP_OPTION_DOMAIN_NAME, /* 15 */
135 SD_DHCP_OPTION_ROUTER_DISCOVER, /* 31 */
136 SD_DHCP_OPTION_STATIC_ROUTE, /* 33 */
137 SD_DHCP_OPTION_VENDOR_SPECIFIC, /* 43 */
138 SD_DHCP_OPTION_NETBIOS_NAMESERVER, /* 44 */
139 SD_DHCP_OPTION_NETBIOS_NODETYPE, /* 46 */
140 SD_DHCP_OPTION_NETBIOS_SCOPE, /* 47 */
141 SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE, /* 121 */
142 SD_DHCP_OPTION_PRIVATE_CLASSLESS_STATIC_ROUTE, /* 249 */
143 SD_DHCP_OPTION_PRIVATE_PROXY_AUTODISCOVERY, /* 252 */
144 };
145
146 static int client_receive_message_raw(
147 sd_event_source *s,
148 int fd,
149 uint32_t revents,
150 void *userdata);
151 static int client_receive_message_udp(
152 sd_event_source *s,
153 int fd,
154 uint32_t revents,
155 void *userdata);
156 static void client_stop(sd_dhcp_client *client, int error);
157
158 int sd_dhcp_client_set_callback(
159 sd_dhcp_client *client,
160 sd_dhcp_client_callback_t cb,
161 void *userdata) {
162
163 assert_return(client, -EINVAL);
164
165 client->callback = cb;
166 client->userdata = userdata;
167
168 return 0;
169 }
170
171 int sd_dhcp_client_set_request_broadcast(sd_dhcp_client *client, int broadcast) {
172 assert_return(client, -EINVAL);
173
174 client->request_broadcast = !!broadcast;
175
176 return 0;
177 }
178
179 int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
180 size_t i;
181
182 assert_return(client, -EINVAL);
183 assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY);
184
185 switch(option) {
186
187 case SD_DHCP_OPTION_PAD:
188 case SD_DHCP_OPTION_OVERLOAD:
189 case SD_DHCP_OPTION_MESSAGE_TYPE:
190 case SD_DHCP_OPTION_PARAMETER_REQUEST_LIST:
191 case SD_DHCP_OPTION_END:
192 return -EINVAL;
193
194 default:
195 break;
196 }
197
198 for (i = 0; i < client->req_opts_size; i++)
199 if (client->req_opts[i] == option)
200 return -EEXIST;
201
202 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
203 client->req_opts_size + 1))
204 return -ENOMEM;
205
206 client->req_opts[client->req_opts_size++] = option;
207
208 return 0;
209 }
210
211 int sd_dhcp_client_set_request_address(
212 sd_dhcp_client *client,
213 const struct in_addr *last_addr) {
214
215 assert_return(client, -EINVAL);
216 assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY);
217
218 if (last_addr)
219 client->last_addr = last_addr->s_addr;
220 else
221 client->last_addr = INADDR_ANY;
222
223 return 0;
224 }
225
226 int sd_dhcp_client_set_ifindex(sd_dhcp_client *client, int ifindex) {
227
228 assert_return(client, -EINVAL);
229 assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED), -EBUSY);
230 assert_return(ifindex > 0, -EINVAL);
231
232 client->ifindex = ifindex;
233 return 0;
234 }
235
236 int sd_dhcp_client_set_mac(
237 sd_dhcp_client *client,
238 const uint8_t *addr,
239 size_t addr_len,
240 uint16_t arp_type) {
241
242 DHCP_CLIENT_DONT_DESTROY(client);
243 bool need_restart = false;
244 int r;
245
246 assert_return(client, -EINVAL);
247 assert_return(addr, -EINVAL);
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;
257
258 if (client->mac_addr_len == addr_len &&
259 memcmp(&client->mac_addr, addr, addr_len) == 0)
260 return 0;
261
262 if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
263 log_dhcp_client(client, "Changing MAC address on running DHCP client, restarting");
264 need_restart = true;
265 client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
266 }
267
268 memcpy(&client->mac_addr, addr, addr_len);
269 client->mac_addr_len = addr_len;
270 client->arp_type = arp_type;
271
272 if (need_restart && client->state != DHCP_STATE_STOPPED) {
273 r = sd_dhcp_client_start(client);
274 if (r < 0)
275 return log_dhcp_client_errno(client, r, "Failed to restart DHCPv4 client: %m");
276 }
277
278 return 0;
279 }
280
281 int sd_dhcp_client_get_client_id(
282 sd_dhcp_client *client,
283 uint8_t *type,
284 const uint8_t **data,
285 size_t *data_len) {
286
287 assert_return(client, -EINVAL);
288 assert_return(type, -EINVAL);
289 assert_return(data, -EINVAL);
290 assert_return(data_len, -EINVAL);
291
292 *type = 0;
293 *data = NULL;
294 *data_len = 0;
295 if (client->client_id_len) {
296 *type = client->client_id.type;
297 *data = client->client_id.raw.data;
298 *data_len = client->client_id_len - sizeof(client->client_id.type);
299 }
300
301 return 0;
302 }
303
304 int sd_dhcp_client_set_client_id(
305 sd_dhcp_client *client,
306 uint8_t type,
307 const uint8_t *data,
308 size_t data_len) {
309
310 DHCP_CLIENT_DONT_DESTROY(client);
311 bool need_restart = false;
312 int r;
313
314 assert_return(client, -EINVAL);
315 assert_return(data, -EINVAL);
316 assert_return(data_len > 0 && data_len <= MAX_CLIENT_ID_LEN, -EINVAL);
317
318 if (client->client_id_len == data_len + sizeof(client->client_id.type) &&
319 client->client_id.type == type &&
320 memcmp(&client->client_id.raw.data, data, data_len) == 0)
321 return 0;
322
323 /* For hardware types, log debug message about unexpected data length.
324 *
325 * Note that infiniband's INFINIBAND_ALEN is 20 bytes long, but only
326 * last last 8 bytes of the address are stable and suitable to put into
327 * the client-id. The caller is advised to account for that. */
328 if ((type == ARPHRD_ETHER && data_len != ETH_ALEN) ||
329 (type == ARPHRD_INFINIBAND && data_len != 8))
330 log_dhcp_client(client, "Changing client ID to hardware type %u with "
331 "unexpected address length %zu",
332 type, data_len);
333
334 if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
335 log_dhcp_client(client, "Changing client ID on running DHCP "
336 "client, restarting");
337 need_restart = true;
338 client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
339 }
340
341 client->client_id.type = type;
342 memcpy(&client->client_id.raw.data, data, data_len);
343 client->client_id_len = data_len + sizeof (client->client_id.type);
344
345 if (need_restart && client->state != DHCP_STATE_STOPPED) {
346 r = sd_dhcp_client_start(client);
347 if (r < 0)
348 return log_dhcp_client_errno(client, r, "Failed to restart DHCPv4 client: %m");
349 }
350
351 return 0;
352 }
353
354 /**
355 * Sets IAID and DUID. If duid is non-null, the DUID is set to duid_type + duid
356 * without further modification. Otherwise, if duid_type is supported, DUID
357 * is set based on that type. Otherwise, an error is returned.
358 */
359 static int dhcp_client_set_iaid_duid_internal(
360 sd_dhcp_client *client,
361 bool iaid_append,
362 bool iaid_set,
363 uint32_t iaid,
364 uint16_t duid_type,
365 const void *duid,
366 size_t duid_len,
367 usec_t llt_time) {
368
369 DHCP_CLIENT_DONT_DESTROY(client);
370 int r;
371 size_t len;
372
373 assert_return(client, -EINVAL);
374 assert_return(duid_len == 0 || duid, -EINVAL);
375
376 if (duid) {
377 r = dhcp_validate_duid_len(duid_type, duid_len, true);
378 if (r < 0)
379 return log_dhcp_client_errno(client, r, "Failed to validate length of DUID: %m");
380 }
381
382 zero(client->client_id);
383 client->client_id.type = 255;
384
385 if (iaid_append) {
386 if (iaid_set)
387 client->client_id.ns.iaid = htobe32(iaid);
388 else {
389 r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr,
390 client->mac_addr_len,
391 true,
392 &client->client_id.ns.iaid);
393 if (r < 0)
394 return log_dhcp_client_errno(client, r, "Failed to set IAID: %m");
395 }
396 }
397
398 if (duid) {
399 client->client_id.ns.duid.type = htobe16(duid_type);
400 memcpy(&client->client_id.ns.duid.raw.data, duid, duid_len);
401 len = sizeof(client->client_id.ns.duid.type) + duid_len;
402 } else
403 switch (duid_type) {
404 case DUID_TYPE_LLT:
405 if (client->mac_addr_len == 0)
406 return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(EOPNOTSUPP), "Failed to set DUID-LLT, MAC address is not set.");
407
408 r = dhcp_identifier_set_duid_llt(&client->client_id.ns.duid, llt_time, client->mac_addr, client->mac_addr_len, client->arp_type, &len);
409 if (r < 0)
410 return log_dhcp_client_errno(client, r, "Failed to set DUID-LLT: %m");
411 break;
412 case DUID_TYPE_EN:
413 r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &len);
414 if (r < 0)
415 return log_dhcp_client_errno(client, r, "Failed to set DUID-EN: %m");
416 break;
417 case DUID_TYPE_LL:
418 if (client->mac_addr_len == 0)
419 return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(EOPNOTSUPP), "Failed to set DUID-LL, MAC address is not set.");
420
421 r = dhcp_identifier_set_duid_ll(&client->client_id.ns.duid, client->mac_addr, client->mac_addr_len, client->arp_type, &len);
422 if (r < 0)
423 return log_dhcp_client_errno(client, r, "Failed to set DUID-LL: %m");
424 break;
425 case DUID_TYPE_UUID:
426 r = dhcp_identifier_set_duid_uuid(&client->client_id.ns.duid, &len);
427 if (r < 0)
428 return log_dhcp_client_errno(client, r, "Failed to set DUID-UUID: %m");
429 break;
430 default:
431 return log_dhcp_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Invalid DUID type");
432 }
433
434 client->client_id_len = sizeof(client->client_id.type) + len +
435 (iaid_append ? sizeof(client->client_id.ns.iaid) : 0);
436
437 if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) {
438 log_dhcp_client(client, "Configured %sDUID, restarting.", iaid_append ? "IAID+" : "");
439 client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
440 r = sd_dhcp_client_start(client);
441 if (r < 0)
442 return log_dhcp_client_errno(client, r, "Failed to restart DHCPv4 client: %m");
443 }
444
445 return 0;
446 }
447
448 int sd_dhcp_client_set_iaid_duid(
449 sd_dhcp_client *client,
450 bool iaid_set,
451 uint32_t iaid,
452 uint16_t duid_type,
453 const void *duid,
454 size_t duid_len) {
455 return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, duid_type, duid, duid_len, 0);
456 }
457
458 int sd_dhcp_client_set_iaid_duid_llt(
459 sd_dhcp_client *client,
460 bool iaid_set,
461 uint32_t iaid,
462 usec_t llt_time) {
463 return dhcp_client_set_iaid_duid_internal(client, true, iaid_set, iaid, DUID_TYPE_LLT, NULL, 0, llt_time);
464 }
465
466 int sd_dhcp_client_set_duid(
467 sd_dhcp_client *client,
468 uint16_t duid_type,
469 const void *duid,
470 size_t duid_len) {
471 return dhcp_client_set_iaid_duid_internal(client, false, false, 0, duid_type, duid, duid_len, 0);
472 }
473
474 int sd_dhcp_client_set_duid_llt(
475 sd_dhcp_client *client,
476 usec_t llt_time) {
477 return dhcp_client_set_iaid_duid_internal(client, false, false, 0, DUID_TYPE_LLT, NULL, 0, llt_time);
478 }
479
480 int sd_dhcp_client_set_hostname(
481 sd_dhcp_client *client,
482 const char *hostname) {
483
484 assert_return(client, -EINVAL);
485
486 /* Make sure hostnames qualify as DNS and as Linux hostnames */
487 if (hostname &&
488 !(hostname_is_valid(hostname, false) && dns_name_is_valid(hostname) > 0))
489 return -EINVAL;
490
491 return free_and_strdup(&client->hostname, hostname);
492 }
493
494 int sd_dhcp_client_set_vendor_class_identifier(
495 sd_dhcp_client *client,
496 const char *vci) {
497
498 assert_return(client, -EINVAL);
499
500 return free_and_strdup(&client->vendor_class_identifier, vci);
501 }
502
503 int sd_dhcp_client_set_user_class(
504 sd_dhcp_client *client,
505 const char* const* user_class) {
506
507 _cleanup_strv_free_ char **s = NULL;
508 char **p;
509
510 STRV_FOREACH(p, (char **) user_class)
511 if (strlen(*p) > 255)
512 return -ENAMETOOLONG;
513
514 s = strv_copy((char **) user_class);
515 if (!s)
516 return -ENOMEM;
517
518 client->user_class = TAKE_PTR(s);
519
520 return 0;
521 }
522
523 int sd_dhcp_client_set_client_port(
524 sd_dhcp_client *client,
525 uint16_t port) {
526
527 assert_return(client, -EINVAL);
528
529 client->port = port;
530
531 return 0;
532 }
533
534 int sd_dhcp_client_set_mtu(sd_dhcp_client *client, uint32_t mtu) {
535 assert_return(client, -EINVAL);
536 assert_return(mtu >= DHCP_DEFAULT_MIN_SIZE, -ERANGE);
537
538 client->mtu = mtu;
539
540 return 0;
541 }
542
543 int sd_dhcp_client_set_max_attempts(sd_dhcp_client *client, uint64_t max_attempts) {
544 assert_return(client, -EINVAL);
545
546 client->max_attempts = max_attempts;
547
548 return 0;
549 }
550
551 static sd_dhcp_option* dhcp_option_free(sd_dhcp_option *i) {
552 if (!i)
553 return NULL;
554
555 free(i->data);
556 return mfree(i);
557 }
558
559 int sd_dhcp_option_new(uint8_t option, void *data, size_t length, sd_dhcp_option **ret) {
560 assert_return(ret, -EINVAL);
561 assert_return(length == 0 || data, -EINVAL);
562
563 _cleanup_free_ void *q = memdup(data, length);
564 if (!q)
565 return -ENOMEM;
566
567 sd_dhcp_option *p = new(sd_dhcp_option, 1);
568 if (!p)
569 return -ENOMEM;
570
571 *p = (sd_dhcp_option) {
572 .n_ref = 1,
573 .option = option,
574 .length = length,
575 .data = TAKE_PTR(q),
576 };
577
578 *ret = TAKE_PTR(p);
579 return 0;
580 }
581
582 DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_option, sd_dhcp_option, dhcp_option_free);
583 DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
584 dhcp_option_hash_ops,
585 void,
586 trivial_hash_func,
587 trivial_compare_func,
588 sd_dhcp_option,
589 sd_dhcp_option_unref);
590
591 int sd_dhcp_client_set_dhcp_option(sd_dhcp_client *client, sd_dhcp_option *v) {
592 int r;
593
594 assert_return(client, -EINVAL);
595 assert_return(v, -EINVAL);
596
597 r = ordered_hashmap_ensure_allocated(&client->options, &dhcp_option_hash_ops);
598 if (r < 0)
599 return r;
600
601 r = ordered_hashmap_put(client->options, UINT_TO_PTR(v->option), v);
602 if (r < 0)
603 return r;
604
605 sd_dhcp_option_ref(v);
606 return 0;
607 }
608
609 int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
610 assert_return(client, -EINVAL);
611
612 if (!IN_SET(client->state, DHCP_STATE_SELECTING, DHCP_STATE_BOUND, DHCP_STATE_RENEWING, DHCP_STATE_REBINDING))
613 return -EADDRNOTAVAIL;
614
615 if (ret)
616 *ret = client->lease;
617
618 return 0;
619 }
620
621 int sd_dhcp_client_set_service_type(sd_dhcp_client *client, int type) {
622 assert_return(client, -EINVAL);
623
624 client->ip_service_type = type;
625
626 return 0;
627 }
628
629 static int client_notify(sd_dhcp_client *client, int event) {
630 assert(client);
631
632 if (client->callback)
633 return client->callback(client, event, client->userdata);
634
635 return 0;
636 }
637
638 static int client_initialize(sd_dhcp_client *client) {
639 assert_return(client, -EINVAL);
640
641 client->receive_message = sd_event_source_unref(client->receive_message);
642
643 client->fd = asynchronous_close(client->fd);
644
645 (void) event_source_disable(client->timeout_resend);
646 (void) event_source_disable(client->timeout_t1);
647 (void) event_source_disable(client->timeout_t2);
648 (void) event_source_disable(client->timeout_expire);
649
650 client->attempt = 0;
651
652 client->state = DHCP_STATE_INIT;
653 client->xid = 0;
654
655 client->lease = sd_dhcp_lease_unref(client->lease);
656
657 return 0;
658 }
659
660 static void client_stop(sd_dhcp_client *client, int error) {
661 assert(client);
662
663 if (error < 0)
664 log_dhcp_client_errno(client, error, "STOPPED: %m");
665 else if (error == SD_DHCP_CLIENT_EVENT_STOP)
666 log_dhcp_client(client, "STOPPED");
667 else
668 log_dhcp_client(client, "STOPPED: Unknown event");
669
670 client_notify(client, error);
671
672 client_initialize(client);
673 }
674
675 static int client_message_init(
676 sd_dhcp_client *client,
677 DHCPPacket **ret,
678 uint8_t type,
679 size_t *_optlen,
680 size_t *_optoffset) {
681
682 _cleanup_free_ DHCPPacket *packet = NULL;
683 size_t optlen, optoffset, size;
684 be16_t max_size;
685 usec_t time_now;
686 uint16_t secs;
687 int r;
688
689 assert(client);
690 assert(client->start_time);
691 assert(ret);
692 assert(_optlen);
693 assert(_optoffset);
694 assert(IN_SET(type, DHCP_DISCOVER, DHCP_REQUEST, DHCP_RELEASE));
695
696 optlen = DHCP_MIN_OPTIONS_SIZE;
697 size = sizeof(DHCPPacket) + optlen;
698
699 packet = malloc0(size);
700 if (!packet)
701 return -ENOMEM;
702
703 r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type,
704 client->arp_type, optlen, &optoffset);
705 if (r < 0)
706 return r;
707
708 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
709 refuse to issue an DHCP lease if 'secs' is set to zero */
710 r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
711 if (r < 0)
712 return r;
713 assert(time_now >= client->start_time);
714
715 /* seconds between sending first and last DISCOVER
716 * must always be strictly positive to deal with broken servers */
717 secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
718 packet->dhcp.secs = htobe16(secs);
719
720 /* RFC2132 section 4.1
721 A client that cannot receive unicast IP datagrams until its protocol
722 software has been configured with an IP address SHOULD set the
723 BROADCAST bit in the 'flags' field to 1 in any DHCPDISCOVER or
724 DHCPREQUEST messages that client sends. The BROADCAST bit will
725 provide a hint to the DHCP server and BOOTP relay agent to broadcast
726 any messages to the client on the client's subnet.
727
728 Note: some interfaces needs this to be enabled, but some networks
729 needs this to be disabled as broadcasts are filteretd, so this
730 needs to be configurable */
731 if (client->request_broadcast || client->arp_type != ARPHRD_ETHER)
732 packet->dhcp.flags = htobe16(0x8000);
733
734 /* RFC2132 section 4.1.1:
735 The client MUST include its hardware address in the ’chaddr’ field, if
736 necessary for delivery of DHCP reply messages. Non-Ethernet
737 interfaces will leave 'chaddr' empty and use the client identifier
738 instead (eg, RFC 4390 section 2.1).
739 */
740 if (client->arp_type == ARPHRD_ETHER)
741 memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN);
742
743 /* If no client identifier exists, construct an RFC 4361-compliant one */
744 if (client->client_id_len == 0) {
745 size_t duid_len;
746
747 client->client_id.type = 255;
748
749 r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len,
750 true, &client->client_id.ns.iaid);
751 if (r < 0)
752 return r;
753
754 r = dhcp_identifier_set_duid_en(&client->client_id.ns.duid, &duid_len);
755 if (r < 0)
756 return r;
757
758 client->client_id_len = sizeof(client->client_id.type) + sizeof(client->client_id.ns.iaid) + duid_len;
759 }
760
761 /* Some DHCP servers will refuse to issue an DHCP lease if the Client
762 Identifier option is not set */
763 if (client->client_id_len) {
764 r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
765 SD_DHCP_OPTION_CLIENT_IDENTIFIER,
766 client->client_id_len,
767 &client->client_id);
768 if (r < 0)
769 return r;
770 }
771
772 /* RFC2131 section 3.5:
773 in its initial DHCPDISCOVER or DHCPREQUEST message, a
774 client may provide the server with a list of specific
775 parameters the client is interested in. If the client
776 includes a list of parameters in a DHCPDISCOVER message,
777 it MUST include that list in any subsequent DHCPREQUEST
778 messages.
779 */
780
781 /* RFC7844 section 3:
782 MAY contain the Parameter Request List option. */
783 /* NOTE: in case that there would be an option to do not send
784 * any PRL at all, the size should be checked before sending */
785 if (client->req_opts_size > 0 && type != DHCP_RELEASE) {
786 r = dhcp_option_append(&packet->dhcp, optlen, &optoffset, 0,
787 SD_DHCP_OPTION_PARAMETER_REQUEST_LIST,
788 client->req_opts_size, client->req_opts);
789 if (r < 0)
790 return r;
791 }
792
793 /* RFC2131 section 3.5:
794 The client SHOULD include the ’maximum DHCP message size’ option to
795 let the server know how large the server may make its DHCP messages.
796
797 Note (from ConnMan): Some DHCP servers will send bigger DHCP packets
798 than the defined default size unless the Maximum Message Size option
799 is explicitly set
800
801 RFC3442 "Requirements to Avoid Sizing Constraints":
802 Because a full routing table can be quite large, the standard 576
803 octet maximum size for a DHCP message may be too short to contain
804 some legitimate Classless Static Route options. Because of this,
805 clients implementing the Classless Static Route option SHOULD send a
806 Maximum DHCP Message Size [4] option if the DHCP client's TCP/IP
807 stack is capable of receiving larger IP datagrams. In this case, the
808 client SHOULD set the value of this option to at least the MTU of the
809 interface that the client is configuring. The client MAY set the
810 value of this option higher, up to the size of the largest UDP packet
811 it is prepared to accept. (Note that the value specified in the
812 Maximum DHCP Message Size option is the total maximum packet size,
813 including IP and UDP headers.)
814 */
815 /* RFC7844 section 3:
816 SHOULD NOT contain any other option. */
817 if (!client->anonymize && type != DHCP_RELEASE) {
818 max_size = htobe16(size);
819 r = dhcp_option_append(&packet->dhcp, client->mtu, &optoffset, 0,
820 SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
821 2, &max_size);
822 if (r < 0)
823 return r;
824 }
825
826 *_optlen = optlen;
827 *_optoffset = optoffset;
828 *ret = TAKE_PTR(packet);
829
830 return 0;
831 }
832
833 static int client_append_fqdn_option(
834 DHCPMessage *message,
835 size_t optlen,
836 size_t *optoffset,
837 const char *fqdn) {
838
839 uint8_t buffer[3 + DHCP_MAX_FQDN_LENGTH];
840 int r;
841
842 buffer[0] = DHCP_FQDN_FLAG_S | /* Request server to perform A RR DNS updates */
843 DHCP_FQDN_FLAG_E; /* Canonical wire format */
844 buffer[1] = 0; /* RCODE1 (deprecated) */
845 buffer[2] = 0; /* RCODE2 (deprecated) */
846
847 r = dns_name_to_wire_format(fqdn, buffer + 3, sizeof(buffer) - 3, false);
848 if (r > 0)
849 r = dhcp_option_append(message, optlen, optoffset, 0,
850 SD_DHCP_OPTION_FQDN, 3 + r, buffer);
851
852 return r;
853 }
854
855 static int dhcp_client_send_raw(
856 sd_dhcp_client *client,
857 DHCPPacket *packet,
858 size_t len) {
859
860 dhcp_packet_append_ip_headers(packet, INADDR_ANY, client->port,
861 INADDR_BROADCAST, DHCP_PORT_SERVER, len, client->ip_service_type);
862
863 return dhcp_network_send_raw_socket(client->fd, &client->link,
864 packet, len);
865 }
866
867 static int client_send_discover(sd_dhcp_client *client) {
868 _cleanup_free_ DHCPPacket *discover = NULL;
869 size_t optoffset, optlen;
870 sd_dhcp_option *j;
871 Iterator i;
872 int r;
873
874 assert(client);
875 assert(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_SELECTING));
876
877 r = client_message_init(client, &discover, DHCP_DISCOVER,
878 &optlen, &optoffset);
879 if (r < 0)
880 return r;
881
882 /* the client may suggest values for the network address
883 and lease time in the DHCPDISCOVER message. The client may include
884 the ’requested IP address’ option to suggest that a particular IP
885 address be assigned, and may include the ’IP address lease time’
886 option to suggest the lease time it would like.
887 */
888 /* RFC7844 section 3:
889 SHOULD NOT contain any other option. */
890 if (!client->anonymize && client->last_addr != INADDR_ANY) {
891 r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
892 SD_DHCP_OPTION_REQUESTED_IP_ADDRESS,
893 4, &client->last_addr);
894 if (r < 0)
895 return r;
896 }
897
898 if (client->hostname) {
899 /* According to RFC 4702 "clients that send the Client FQDN option in
900 their messages MUST NOT also send the Host Name option". Just send
901 one of the two depending on the hostname type.
902 */
903 if (dns_name_is_single_label(client->hostname)) {
904 /* it is unclear from RFC 2131 if client should send hostname in
905 DHCPDISCOVER but dhclient does and so we do as well
906 */
907 r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
908 SD_DHCP_OPTION_HOST_NAME,
909 strlen(client->hostname), client->hostname);
910 } else
911 r = client_append_fqdn_option(&discover->dhcp, optlen, &optoffset,
912 client->hostname);
913 if (r < 0)
914 return r;
915 }
916
917 if (client->vendor_class_identifier) {
918 r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
919 SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER,
920 strlen(client->vendor_class_identifier),
921 client->vendor_class_identifier);
922 if (r < 0)
923 return r;
924 }
925
926 if (client->user_class) {
927 r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
928 SD_DHCP_OPTION_USER_CLASS,
929 strv_length(client->user_class),
930 client->user_class);
931 if (r < 0)
932 return r;
933 }
934
935 ORDERED_HASHMAP_FOREACH(j, client->options, i) {
936 r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
937 j->option, j->length, j->data);
938 if (r < 0)
939 return r;
940 }
941
942 r = dhcp_option_append(&discover->dhcp, optlen, &optoffset, 0,
943 SD_DHCP_OPTION_END, 0, NULL);
944 if (r < 0)
945 return r;
946
947 /* We currently ignore:
948 The client SHOULD wait a random time between one and ten seconds to
949 desynchronize the use of DHCP at startup.
950 */
951 r = dhcp_client_send_raw(client, discover, sizeof(DHCPPacket) + optoffset);
952 if (r < 0)
953 return r;
954
955 log_dhcp_client(client, "DISCOVER");
956
957 return 0;
958 }
959
960 static int client_send_request(sd_dhcp_client *client) {
961 _cleanup_free_ DHCPPacket *request = NULL;
962 size_t optoffset, optlen;
963 int r;
964
965 assert(client);
966
967 r = client_message_init(client, &request, DHCP_REQUEST, &optlen, &optoffset);
968 if (r < 0)
969 return r;
970
971 switch (client->state) {
972 /* See RFC2131 section 4.3.2 (note that there is a typo in the RFC,
973 SELECTING should be REQUESTING)
974 */
975
976 case DHCP_STATE_REQUESTING:
977 /* Client inserts the address of the selected server in ’server
978 identifier’, ’ciaddr’ MUST be zero, ’requested IP address’ MUST be
979 filled in with the yiaddr value from the chosen DHCPOFFER.
980 */
981
982 r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
983 SD_DHCP_OPTION_SERVER_IDENTIFIER,
984 4, &client->lease->server_address);
985 if (r < 0)
986 return r;
987
988 r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
989 SD_DHCP_OPTION_REQUESTED_IP_ADDRESS,
990 4, &client->lease->address);
991 if (r < 0)
992 return r;
993
994 break;
995
996 case DHCP_STATE_INIT_REBOOT:
997 /* ’server identifier’ MUST NOT be filled in, ’requested IP address’
998 option MUST be filled in with client’s notion of its previously
999 assigned address. ’ciaddr’ MUST be zero.
1000 */
1001 r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
1002 SD_DHCP_OPTION_REQUESTED_IP_ADDRESS,
1003 4, &client->last_addr);
1004 if (r < 0)
1005 return r;
1006 break;
1007
1008 case DHCP_STATE_RENEWING:
1009 /* ’server identifier’ MUST NOT be filled in, ’requested IP address’
1010 option MUST NOT be filled in, ’ciaddr’ MUST be filled in with
1011 client’s IP address.
1012 */
1013
1014 case DHCP_STATE_REBINDING:
1015 /* ’server identifier’ MUST NOT be filled in, ’requested IP address’
1016 option MUST NOT be filled in, ’ciaddr’ MUST be filled in with
1017 client’s IP address.
1018
1019 This message MUST be broadcast to the 0xffffffff IP broadcast address.
1020 */
1021 request->dhcp.ciaddr = client->lease->address;
1022
1023 break;
1024
1025 case DHCP_STATE_INIT:
1026 case DHCP_STATE_SELECTING:
1027 case DHCP_STATE_REBOOTING:
1028 case DHCP_STATE_BOUND:
1029 case DHCP_STATE_STOPPED:
1030 return -EINVAL;
1031 }
1032
1033 if (client->hostname) {
1034 if (dns_name_is_single_label(client->hostname))
1035 r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
1036 SD_DHCP_OPTION_HOST_NAME,
1037 strlen(client->hostname), client->hostname);
1038 else
1039 r = client_append_fqdn_option(&request->dhcp, optlen, &optoffset,
1040 client->hostname);
1041 if (r < 0)
1042 return r;
1043 }
1044
1045 if (client->vendor_class_identifier) {
1046 r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
1047 SD_DHCP_OPTION_VENDOR_CLASS_IDENTIFIER,
1048 strlen(client->vendor_class_identifier),
1049 client->vendor_class_identifier);
1050 if (r < 0)
1051 return r;
1052 }
1053
1054 r = dhcp_option_append(&request->dhcp, optlen, &optoffset, 0,
1055 SD_DHCP_OPTION_END, 0, NULL);
1056 if (r < 0)
1057 return r;
1058
1059 if (client->state == DHCP_STATE_RENEWING)
1060 r = dhcp_network_send_udp_socket(client->fd,
1061 client->lease->server_address,
1062 DHCP_PORT_SERVER,
1063 &request->dhcp,
1064 sizeof(DHCPMessage) + optoffset);
1065 else
1066 r = dhcp_client_send_raw(client, request, sizeof(DHCPPacket) + optoffset);
1067 if (r < 0)
1068 return r;
1069
1070 switch (client->state) {
1071
1072 case DHCP_STATE_REQUESTING:
1073 log_dhcp_client(client, "REQUEST (requesting)");
1074 break;
1075
1076 case DHCP_STATE_INIT_REBOOT:
1077 log_dhcp_client(client, "REQUEST (init-reboot)");
1078 break;
1079
1080 case DHCP_STATE_RENEWING:
1081 log_dhcp_client(client, "REQUEST (renewing)");
1082 break;
1083
1084 case DHCP_STATE_REBINDING:
1085 log_dhcp_client(client, "REQUEST (rebinding)");
1086 break;
1087
1088 default:
1089 log_dhcp_client(client, "REQUEST (invalid)");
1090 break;
1091 }
1092
1093 return 0;
1094 }
1095
1096 static int client_start(sd_dhcp_client *client);
1097
1098 static int client_timeout_resend(
1099 sd_event_source *s,
1100 uint64_t usec,
1101 void *userdata) {
1102
1103 sd_dhcp_client *client = userdata;
1104 DHCP_CLIENT_DONT_DESTROY(client);
1105 usec_t next_timeout = 0;
1106 uint64_t time_now;
1107 uint32_t time_left;
1108 int r;
1109
1110 assert(s);
1111 assert(client);
1112 assert(client->event);
1113
1114 r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
1115 if (r < 0)
1116 goto error;
1117
1118 switch (client->state) {
1119
1120 case DHCP_STATE_RENEWING:
1121
1122 time_left = (client->lease->t2 - client->lease->t1) / 2;
1123 if (time_left < 60)
1124 time_left = 60;
1125
1126 next_timeout = time_now + time_left * USEC_PER_SEC;
1127
1128 break;
1129
1130 case DHCP_STATE_REBINDING:
1131
1132 time_left = (client->lease->lifetime - client->lease->t2) / 2;
1133 if (time_left < 60)
1134 time_left = 60;
1135
1136 next_timeout = time_now + time_left * USEC_PER_SEC;
1137 break;
1138
1139 case DHCP_STATE_REBOOTING:
1140 /* start over as we did not receive a timely ack or nak */
1141 r = client_initialize(client);
1142 if (r < 0)
1143 goto error;
1144
1145 r = client_start(client);
1146 if (r < 0)
1147 goto error;
1148 else {
1149 log_dhcp_client(client, "REBOOTED");
1150 return 0;
1151 }
1152
1153 case DHCP_STATE_INIT:
1154 case DHCP_STATE_INIT_REBOOT:
1155 case DHCP_STATE_SELECTING:
1156 case DHCP_STATE_REQUESTING:
1157 case DHCP_STATE_BOUND:
1158
1159 if (client->attempt < client->max_attempts)
1160 client->attempt++;
1161 else
1162 goto error;
1163
1164 next_timeout = time_now + ((UINT64_C(1) << MIN(client->attempt, (uint64_t) 6)) - 1) * USEC_PER_SEC;
1165
1166 break;
1167
1168 case DHCP_STATE_STOPPED:
1169 r = -EINVAL;
1170 goto error;
1171 }
1172
1173 next_timeout += (random_u32() & 0x1fffff);
1174
1175 r = event_reset_time(client->event, &client->timeout_resend,
1176 clock_boottime_or_monotonic(),
1177 next_timeout, 10 * USEC_PER_MSEC,
1178 client_timeout_resend, client,
1179 client->event_priority, "dhcp4-resend-timer", true);
1180 if (r < 0)
1181 goto error;
1182
1183 switch (client->state) {
1184 case DHCP_STATE_INIT:
1185 r = client_send_discover(client);
1186 if (r >= 0) {
1187 client->state = DHCP_STATE_SELECTING;
1188 client->attempt = 0;
1189 } else if (client->attempt >= client->max_attempts)
1190 goto error;
1191
1192 break;
1193
1194 case DHCP_STATE_SELECTING:
1195 r = client_send_discover(client);
1196 if (r < 0 && client->attempt >= client->max_attempts)
1197 goto error;
1198
1199 break;
1200
1201 case DHCP_STATE_INIT_REBOOT:
1202 case DHCP_STATE_REQUESTING:
1203 case DHCP_STATE_RENEWING:
1204 case DHCP_STATE_REBINDING:
1205 r = client_send_request(client);
1206 if (r < 0 && client->attempt >= client->max_attempts)
1207 goto error;
1208
1209 if (client->state == DHCP_STATE_INIT_REBOOT)
1210 client->state = DHCP_STATE_REBOOTING;
1211
1212 client->request_sent = time_now;
1213
1214 break;
1215
1216 case DHCP_STATE_REBOOTING:
1217 case DHCP_STATE_BOUND:
1218
1219 break;
1220
1221 case DHCP_STATE_STOPPED:
1222 r = -EINVAL;
1223 goto error;
1224 }
1225
1226 return 0;
1227
1228 error:
1229 client_stop(client, r);
1230
1231 /* Errors were dealt with when stopping the client, don't spill
1232 errors into the event loop handler */
1233 return 0;
1234 }
1235
1236 static int client_initialize_io_events(
1237 sd_dhcp_client *client,
1238 sd_event_io_handler_t io_callback) {
1239
1240 int r;
1241
1242 assert(client);
1243 assert(client->event);
1244
1245 r = sd_event_add_io(client->event, &client->receive_message,
1246 client->fd, EPOLLIN, io_callback,
1247 client);
1248 if (r < 0)
1249 goto error;
1250
1251 r = sd_event_source_set_priority(client->receive_message,
1252 client->event_priority);
1253 if (r < 0)
1254 goto error;
1255
1256 r = sd_event_source_set_description(client->receive_message, "dhcp4-receive-message");
1257 if (r < 0)
1258 goto error;
1259
1260 error:
1261 if (r < 0)
1262 client_stop(client, r);
1263
1264 return 0;
1265 }
1266
1267 static int client_initialize_time_events(sd_dhcp_client *client) {
1268 uint64_t usec = 0;
1269 int r;
1270
1271 assert(client);
1272 assert(client->event);
1273
1274 if (client->start_delay > 0) {
1275 assert_se(sd_event_now(client->event, clock_boottime_or_monotonic(), &usec) >= 0);
1276 usec += client->start_delay;
1277 }
1278
1279 r = event_reset_time(client->event, &client->timeout_resend,
1280 clock_boottime_or_monotonic(),
1281 usec, 0,
1282 client_timeout_resend, client,
1283 client->event_priority, "dhcp4-resend-timer", true);
1284 if (r < 0)
1285 client_stop(client, r);
1286
1287 return 0;
1288
1289 }
1290
1291 static int client_initialize_events(sd_dhcp_client *client, sd_event_io_handler_t io_callback) {
1292 client_initialize_io_events(client, io_callback);
1293 client_initialize_time_events(client);
1294
1295 return 0;
1296 }
1297
1298 static int client_start_delayed(sd_dhcp_client *client) {
1299 int r;
1300
1301 assert_return(client, -EINVAL);
1302 assert_return(client->event, -EINVAL);
1303 assert_return(client->ifindex > 0, -EINVAL);
1304 assert_return(client->fd < 0, -EBUSY);
1305 assert_return(client->xid == 0, -EINVAL);
1306 assert_return(IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT), -EBUSY);
1307
1308 client->xid = random_u32();
1309
1310 r = dhcp_network_bind_raw_socket(client->ifindex, &client->link,
1311 client->xid, client->mac_addr,
1312 client->mac_addr_len, client->arp_type, client->port);
1313 if (r < 0) {
1314 client_stop(client, r);
1315 return r;
1316 }
1317 client->fd = r;
1318
1319 if (IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_INIT_REBOOT))
1320 client->start_time = now(clock_boottime_or_monotonic());
1321
1322 return client_initialize_events(client, client_receive_message_raw);
1323 }
1324
1325 static int client_start(sd_dhcp_client *client) {
1326 client->start_delay = 0;
1327 return client_start_delayed(client);
1328 }
1329
1330 static int client_timeout_expire(sd_event_source *s, uint64_t usec, void *userdata) {
1331 sd_dhcp_client *client = userdata;
1332 DHCP_CLIENT_DONT_DESTROY(client);
1333
1334 log_dhcp_client(client, "EXPIRED");
1335
1336 client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED);
1337
1338 /* lease was lost, start over if not freed or stopped in callback */
1339 if (client->state != DHCP_STATE_STOPPED) {
1340 client_initialize(client);
1341 client_start(client);
1342 }
1343
1344 return 0;
1345 }
1346
1347 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
1348 sd_dhcp_client *client = userdata;
1349 DHCP_CLIENT_DONT_DESTROY(client);
1350 int r;
1351
1352 assert(client);
1353
1354 client->receive_message = sd_event_source_unref(client->receive_message);
1355 client->fd = asynchronous_close(client->fd);
1356
1357 client->state = DHCP_STATE_REBINDING;
1358 client->attempt = 0;
1359
1360 r = dhcp_network_bind_raw_socket(client->ifindex, &client->link,
1361 client->xid, client->mac_addr,
1362 client->mac_addr_len, client->arp_type,
1363 client->port);
1364 if (r < 0) {
1365 client_stop(client, r);
1366 return 0;
1367 }
1368 client->fd = r;
1369
1370 return client_initialize_events(client, client_receive_message_raw);
1371 }
1372
1373 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
1374 sd_dhcp_client *client = userdata;
1375 DHCP_CLIENT_DONT_DESTROY(client);
1376
1377 client->state = DHCP_STATE_RENEWING;
1378 client->attempt = 0;
1379
1380 return client_initialize_time_events(client);
1381 }
1382
1383 static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer, size_t len) {
1384 _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
1385 int r;
1386
1387 r = dhcp_lease_new(&lease);
1388 if (r < 0)
1389 return r;
1390
1391 if (client->client_id_len) {
1392 r = dhcp_lease_set_client_id(lease,
1393 (uint8_t *) &client->client_id,
1394 client->client_id_len);
1395 if (r < 0)
1396 return r;
1397 }
1398
1399 r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease, NULL);
1400 if (r != DHCP_OFFER) {
1401 log_dhcp_client(client, "received message was not an OFFER, ignoring");
1402 return -ENOMSG;
1403 }
1404
1405 lease->next_server = offer->siaddr;
1406 lease->address = offer->yiaddr;
1407
1408 if (lease->address == 0 ||
1409 lease->server_address == 0 ||
1410 lease->lifetime == 0) {
1411 log_dhcp_client(client, "received lease lacks address, server address or lease lifetime, ignoring");
1412 return -ENOMSG;
1413 }
1414
1415 if (!lease->have_subnet_mask) {
1416 r = dhcp_lease_set_default_subnet_mask(lease);
1417 if (r < 0) {
1418 log_dhcp_client(client,
1419 "received lease lacks subnet mask, "
1420 "and a fallback one cannot be generated, ignoring");
1421 return -ENOMSG;
1422 }
1423 }
1424
1425 sd_dhcp_lease_unref(client->lease);
1426 client->lease = TAKE_PTR(lease);
1427
1428 if (client_notify(client, SD_DHCP_CLIENT_EVENT_SELECTING) < 0)
1429 return -ENOMSG;
1430
1431 log_dhcp_client(client, "OFFER");
1432
1433 return 0;
1434 }
1435
1436 static int client_handle_forcerenew(sd_dhcp_client *client, DHCPMessage *force, size_t len) {
1437 int r;
1438
1439 r = dhcp_option_parse(force, len, NULL, NULL, NULL);
1440 if (r != DHCP_FORCERENEW)
1441 return -ENOMSG;
1442
1443 log_dhcp_client(client, "FORCERENEW");
1444
1445 return 0;
1446 }
1447
1448 static bool lease_equal(const sd_dhcp_lease *a, const sd_dhcp_lease *b) {
1449 if (a->address != b->address)
1450 return false;
1451
1452 if (a->subnet_mask != b->subnet_mask)
1453 return false;
1454
1455 if (a->router_size != b->router_size)
1456 return false;
1457
1458 for (size_t i = 0; i < a->router_size; i++)
1459 if (a->router[i].s_addr != b->router[i].s_addr)
1460 return false;
1461
1462 return true;
1463 }
1464
1465 static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack, size_t len) {
1466 _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
1467 _cleanup_free_ char *error_message = NULL;
1468 int r;
1469
1470 r = dhcp_lease_new(&lease);
1471 if (r < 0)
1472 return r;
1473
1474 if (client->client_id_len) {
1475 r = dhcp_lease_set_client_id(lease,
1476 (uint8_t *) &client->client_id,
1477 client->client_id_len);
1478 if (r < 0)
1479 return r;
1480 }
1481
1482 r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease, &error_message);
1483 if (r == DHCP_NAK) {
1484 log_dhcp_client(client, "NAK: %s", strna(error_message));
1485 return -EADDRNOTAVAIL;
1486 }
1487
1488 if (r != DHCP_ACK) {
1489 log_dhcp_client(client, "received message was not an ACK, ignoring");
1490 return -ENOMSG;
1491 }
1492
1493 lease->next_server = ack->siaddr;
1494
1495 lease->address = ack->yiaddr;
1496
1497 if (lease->address == INADDR_ANY ||
1498 lease->server_address == INADDR_ANY ||
1499 lease->lifetime == 0) {
1500 log_dhcp_client(client, "received lease lacks address, server "
1501 "address or lease lifetime, ignoring");
1502 return -ENOMSG;
1503 }
1504
1505 if (lease->subnet_mask == INADDR_ANY) {
1506 r = dhcp_lease_set_default_subnet_mask(lease);
1507 if (r < 0) {
1508 log_dhcp_client(client,
1509 "received lease lacks subnet mask, "
1510 "and a fallback one cannot be generated, ignoring");
1511 return -ENOMSG;
1512 }
1513 }
1514
1515 r = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE;
1516 if (client->lease) {
1517 if (lease_equal(client->lease, lease))
1518 r = SD_DHCP_CLIENT_EVENT_RENEW;
1519 else
1520 r = SD_DHCP_CLIENT_EVENT_IP_CHANGE;
1521
1522 client->lease = sd_dhcp_lease_unref(client->lease);
1523 }
1524
1525 client->lease = TAKE_PTR(lease);
1526
1527 log_dhcp_client(client, "ACK");
1528
1529 return r;
1530 }
1531
1532 static uint64_t client_compute_timeout(sd_dhcp_client *client, uint32_t lifetime, double factor) {
1533 assert(client);
1534 assert(client->request_sent);
1535 assert(lifetime > 0);
1536
1537 if (lifetime > 3)
1538 lifetime -= 3;
1539 else
1540 lifetime = 0;
1541
1542 return client->request_sent + (lifetime * USEC_PER_SEC * factor) +
1543 + (random_u32() & 0x1fffff);
1544 }
1545
1546 static int client_set_lease_timeouts(sd_dhcp_client *client) {
1547 usec_t time_now;
1548 uint64_t lifetime_timeout;
1549 uint64_t t2_timeout;
1550 uint64_t t1_timeout;
1551 char time_string[FORMAT_TIMESPAN_MAX];
1552 int r;
1553
1554 assert(client);
1555 assert(client->event);
1556 assert(client->lease);
1557 assert(client->lease->lifetime);
1558
1559 /* don't set timers for infinite leases */
1560 if (client->lease->lifetime == 0xffffffff) {
1561 (void) event_source_disable(client->timeout_t1);
1562 (void) event_source_disable(client->timeout_t2);
1563 (void) event_source_disable(client->timeout_expire);
1564
1565 return 0;
1566 }
1567
1568 r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now);
1569 if (r < 0)
1570 return r;
1571 assert(client->request_sent <= time_now);
1572
1573 /* convert the various timeouts from relative (secs) to absolute (usecs) */
1574 lifetime_timeout = client_compute_timeout(client, client->lease->lifetime, 1);
1575 if (client->lease->t1 > 0 && client->lease->t2 > 0) {
1576 /* both T1 and T2 are given */
1577 if (client->lease->t1 < client->lease->t2 &&
1578 client->lease->t2 < client->lease->lifetime) {
1579 /* they are both valid */
1580 t2_timeout = client_compute_timeout(client, client->lease->t2, 1);
1581 t1_timeout = client_compute_timeout(client, client->lease->t1, 1);
1582 } else {
1583 /* discard both */
1584 t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
1585 client->lease->t2 = (client->lease->lifetime * 7) / 8;
1586 t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
1587 client->lease->t1 = client->lease->lifetime / 2;
1588 }
1589 } else if (client->lease->t2 > 0 && client->lease->t2 < client->lease->lifetime) {
1590 /* only T2 is given, and it is valid */
1591 t2_timeout = client_compute_timeout(client, client->lease->t2, 1);
1592 t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
1593 client->lease->t1 = client->lease->lifetime / 2;
1594 if (t2_timeout <= t1_timeout) {
1595 /* the computed T1 would be invalid, so discard T2 */
1596 t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
1597 client->lease->t2 = (client->lease->lifetime * 7) / 8;
1598 }
1599 } else if (client->lease->t1 > 0 && client->lease->t1 < client->lease->lifetime) {
1600 /* only T1 is given, and it is valid */
1601 t1_timeout = client_compute_timeout(client, client->lease->t1, 1);
1602 t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
1603 client->lease->t2 = (client->lease->lifetime * 7) / 8;
1604 if (t2_timeout <= t1_timeout) {
1605 /* the computed T2 would be invalid, so discard T1 */
1606 t2_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
1607 client->lease->t2 = client->lease->lifetime / 2;
1608 }
1609 } else {
1610 /* fall back to the default timeouts */
1611 t1_timeout = client_compute_timeout(client, client->lease->lifetime, 0.5);
1612 client->lease->t1 = client->lease->lifetime / 2;
1613 t2_timeout = client_compute_timeout(client, client->lease->lifetime, 7.0 / 8.0);
1614 client->lease->t2 = (client->lease->lifetime * 7) / 8;
1615 }
1616
1617 /* arm lifetime timeout */
1618 r = event_reset_time(client->event, &client->timeout_expire,
1619 clock_boottime_or_monotonic(),
1620 lifetime_timeout, 10 * USEC_PER_MSEC,
1621 client_timeout_expire, client,
1622 client->event_priority, "dhcp4-lifetime", true);
1623 if (r < 0)
1624 return r;
1625
1626 log_dhcp_client(client, "lease expires in %s",
1627 format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_timeout - time_now, USEC_PER_SEC));
1628
1629 /* don't arm earlier timeouts if this has already expired */
1630 if (lifetime_timeout <= time_now)
1631 return 0;
1632
1633 /* arm T2 timeout */
1634 r = event_reset_time(client->event, &client->timeout_t2,
1635 clock_boottime_or_monotonic(),
1636 t2_timeout, 10 * USEC_PER_MSEC,
1637 client_timeout_t2, client,
1638 client->event_priority, "dhcp4-t2-timeout", true);
1639 if (r < 0)
1640 return r;
1641
1642 log_dhcp_client(client, "T2 expires in %s",
1643 format_timespan(time_string, FORMAT_TIMESPAN_MAX, t2_timeout - time_now, USEC_PER_SEC));
1644
1645 /* don't arm earlier timeout if this has already expired */
1646 if (t2_timeout <= time_now)
1647 return 0;
1648
1649 /* arm T1 timeout */
1650 r = event_reset_time(client->event, &client->timeout_t1,
1651 clock_boottime_or_monotonic(),
1652 t1_timeout, 10 * USEC_PER_MSEC,
1653 client_timeout_t1, client,
1654 client->event_priority, "dhcp4-t1-timer", true);
1655 if (r < 0)
1656 return r;
1657
1658 log_dhcp_client(client, "T1 expires in %s",
1659 format_timespan(time_string, FORMAT_TIMESPAN_MAX, t1_timeout - time_now, USEC_PER_SEC));
1660
1661 return 0;
1662 }
1663
1664 static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message, int len) {
1665 DHCP_CLIENT_DONT_DESTROY(client);
1666 char time_string[FORMAT_TIMESPAN_MAX];
1667 int r = 0, notify_event = 0;
1668
1669 assert(client);
1670 assert(client->event);
1671 assert(message);
1672
1673 switch (client->state) {
1674 case DHCP_STATE_SELECTING:
1675
1676 r = client_handle_offer(client, message, len);
1677 if (r >= 0) {
1678
1679 client->state = DHCP_STATE_REQUESTING;
1680 client->attempt = 0;
1681
1682 r = event_reset_time(client->event, &client->timeout_resend,
1683 clock_boottime_or_monotonic(),
1684 0, 0,
1685 client_timeout_resend, client,
1686 client->event_priority, "dhcp4-resend-timer", true);
1687 if (r < 0)
1688 goto error;
1689 } else if (r == -ENOMSG)
1690 /* invalid message, let's ignore it */
1691 return 0;
1692
1693 break;
1694
1695 case DHCP_STATE_REBOOTING:
1696 case DHCP_STATE_REQUESTING:
1697 case DHCP_STATE_RENEWING:
1698 case DHCP_STATE_REBINDING:
1699
1700 r = client_handle_ack(client, message, len);
1701 if (r >= 0) {
1702 client->start_delay = 0;
1703 (void) event_source_disable(client->timeout_resend);
1704 client->receive_message =
1705 sd_event_source_unref(client->receive_message);
1706 client->fd = asynchronous_close(client->fd);
1707
1708 if (IN_SET(client->state, DHCP_STATE_REQUESTING,
1709 DHCP_STATE_REBOOTING))
1710 notify_event = SD_DHCP_CLIENT_EVENT_IP_ACQUIRE;
1711 else if (r != SD_DHCP_CLIENT_EVENT_IP_ACQUIRE)
1712 notify_event = r;
1713
1714 client->state = DHCP_STATE_BOUND;
1715 client->attempt = 0;
1716
1717 client->last_addr = client->lease->address;
1718
1719 r = client_set_lease_timeouts(client);
1720 if (r < 0) {
1721 log_dhcp_client(client, "could not set lease timeouts");
1722 goto error;
1723 }
1724
1725 r = dhcp_network_bind_udp_socket(client->ifindex, client->lease->address, client->port, client->ip_service_type);
1726 if (r < 0) {
1727 log_dhcp_client(client, "could not bind UDP socket");
1728 goto error;
1729 }
1730
1731 client->fd = r;
1732
1733 client_initialize_io_events(client, client_receive_message_udp);
1734
1735 if (notify_event) {
1736 client_notify(client, notify_event);
1737 if (client->state == DHCP_STATE_STOPPED)
1738 return 0;
1739 }
1740
1741 } else if (r == -EADDRNOTAVAIL) {
1742 /* got a NAK, let's restart the client */
1743 client_notify(client, SD_DHCP_CLIENT_EVENT_EXPIRED);
1744
1745 r = client_initialize(client);
1746 if (r < 0)
1747 goto error;
1748
1749 r = client_start_delayed(client);
1750 if (r < 0)
1751 goto error;
1752
1753 log_dhcp_client(client, "REBOOT in %s", format_timespan(time_string, FORMAT_TIMESPAN_MAX,
1754 client->start_delay, USEC_PER_SEC));
1755
1756 client->start_delay = CLAMP(client->start_delay * 2,
1757 RESTART_AFTER_NAK_MIN_USEC, RESTART_AFTER_NAK_MAX_USEC);
1758
1759 return 0;
1760 } else if (r == -ENOMSG)
1761 /* invalid message, let's ignore it */
1762 return 0;
1763
1764 break;
1765
1766 case DHCP_STATE_BOUND:
1767 r = client_handle_forcerenew(client, message, len);
1768 if (r >= 0) {
1769 r = client_timeout_t1(NULL, 0, client);
1770 if (r < 0)
1771 goto error;
1772 } else if (r == -ENOMSG)
1773 /* invalid message, let's ignore it */
1774 return 0;
1775
1776 break;
1777
1778 case DHCP_STATE_INIT:
1779 case DHCP_STATE_INIT_REBOOT:
1780
1781 break;
1782
1783 case DHCP_STATE_STOPPED:
1784 r = -EINVAL;
1785 goto error;
1786 }
1787
1788 error:
1789 if (r < 0)
1790 client_stop(client, r);
1791
1792 return r;
1793 }
1794
1795 static int client_receive_message_udp(
1796 sd_event_source *s,
1797 int fd,
1798 uint32_t revents,
1799 void *userdata) {
1800
1801 sd_dhcp_client *client = userdata;
1802 _cleanup_free_ DHCPMessage *message = NULL;
1803 const uint8_t *expected_chaddr = NULL;
1804 uint8_t expected_hlen = 0;
1805 ssize_t len, buflen;
1806
1807 assert(s);
1808 assert(client);
1809
1810 buflen = next_datagram_size_fd(fd);
1811 if (buflen == -ENETDOWN) {
1812 /* the link is down. Don't return an error or the I/O event
1813 source will be disconnected and we won't be able to receive
1814 packets again when the link comes back. */
1815 return 0;
1816 }
1817 if (buflen < 0)
1818 return buflen;
1819
1820 message = malloc0(buflen);
1821 if (!message)
1822 return -ENOMEM;
1823
1824 len = recv(fd, message, buflen, 0);
1825 if (len < 0) {
1826 /* see comment above for why we shouldn't error out on ENETDOWN. */
1827 if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN))
1828 return 0;
1829
1830 return log_dhcp_client_errno(client, errno,
1831 "Could not receive message from UDP socket: %m");
1832 }
1833 if ((size_t) len < sizeof(DHCPMessage)) {
1834 log_dhcp_client(client, "Too small to be a DHCP message: ignoring");
1835 return 0;
1836 }
1837
1838 if (be32toh(message->magic) != DHCP_MAGIC_COOKIE) {
1839 log_dhcp_client(client, "Not a DHCP message: ignoring");
1840 return 0;
1841 }
1842
1843 if (message->op != BOOTREPLY) {
1844 log_dhcp_client(client, "Not a BOOTREPLY message: ignoring");
1845 return 0;
1846 }
1847
1848 if (message->htype != client->arp_type) {
1849 log_dhcp_client(client, "Packet type does not match client type");
1850 return 0;
1851 }
1852
1853 if (client->arp_type == ARPHRD_ETHER) {
1854 expected_hlen = ETH_ALEN;
1855 expected_chaddr = &client->mac_addr[0];
1856 }
1857
1858 if (message->hlen != expected_hlen) {
1859 log_dhcp_client(client, "Unexpected packet hlen %d", message->hlen);
1860 return 0;
1861 }
1862
1863 if (expected_hlen > 0 && memcmp(&message->chaddr[0], expected_chaddr, expected_hlen)) {
1864 log_dhcp_client(client, "Received chaddr does not match expected: ignoring");
1865 return 0;
1866 }
1867
1868 if (client->state != DHCP_STATE_BOUND &&
1869 be32toh(message->xid) != client->xid) {
1870 /* in BOUND state, we may receive FORCERENEW with xid set by server,
1871 so ignore the xid in this case */
1872 log_dhcp_client(client, "Received xid (%u) does not match expected (%u): ignoring",
1873 be32toh(message->xid), client->xid);
1874 return 0;
1875 }
1876
1877 return client_handle_message(client, message, len);
1878 }
1879
1880 static int client_receive_message_raw(
1881 sd_event_source *s,
1882 int fd,
1883 uint32_t revents,
1884 void *userdata) {
1885
1886 sd_dhcp_client *client = userdata;
1887 _cleanup_free_ DHCPPacket *packet = NULL;
1888 uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))];
1889 struct iovec iov = {};
1890 struct msghdr msg = {
1891 .msg_iov = &iov,
1892 .msg_iovlen = 1,
1893 .msg_control = cmsgbuf,
1894 .msg_controllen = sizeof(cmsgbuf),
1895 };
1896 struct cmsghdr *cmsg;
1897 bool checksum = true;
1898 ssize_t buflen, len;
1899 int r;
1900
1901 assert(s);
1902 assert(client);
1903
1904 buflen = next_datagram_size_fd(fd);
1905 if (buflen == -ENETDOWN)
1906 return 0;
1907 if (buflen < 0)
1908 return buflen;
1909
1910 packet = malloc0(buflen);
1911 if (!packet)
1912 return -ENOMEM;
1913
1914 iov = IOVEC_MAKE(packet, buflen);
1915
1916 len = recvmsg(fd, &msg, 0);
1917 if (len < 0) {
1918 if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN))
1919 return 0;
1920
1921 return log_dhcp_client_errno(client, errno,
1922 "Could not receive message from raw socket: %m");
1923 } else if ((size_t)len < sizeof(DHCPPacket))
1924 return 0;
1925
1926 CMSG_FOREACH(cmsg, &msg)
1927 if (cmsg->cmsg_level == SOL_PACKET &&
1928 cmsg->cmsg_type == PACKET_AUXDATA &&
1929 cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) {
1930 struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg);
1931
1932 checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
1933 break;
1934 }
1935
1936 r = dhcp_packet_verify_headers(packet, len, checksum, client->port);
1937 if (r < 0)
1938 return 0;
1939
1940 len -= DHCP_IP_UDP_SIZE;
1941
1942 return client_handle_message(client, &packet->dhcp, len);
1943 }
1944
1945 int sd_dhcp_client_send_renew(sd_dhcp_client *client) {
1946 assert_return(client, -EINVAL);
1947 assert_return(client->fd >= 0, -EINVAL);
1948
1949 client->start_delay = 0;
1950 client->attempt = 1;
1951 client->state = DHCP_STATE_RENEWING;
1952
1953 return client_initialize_time_events(client);
1954 }
1955
1956 int sd_dhcp_client_start(sd_dhcp_client *client) {
1957 int r;
1958
1959 assert_return(client, -EINVAL);
1960
1961 r = client_initialize(client);
1962 if (r < 0)
1963 return r;
1964
1965 /* RFC7844 section 3.3:
1966 SHOULD perform a complete four-way handshake, starting with a
1967 DHCPDISCOVER, to obtain a new address lease. If the client can
1968 ascertain that this is exactly the same network to which it was
1969 previously connected, and if the link-layer address did not change,
1970 the client MAY issue a DHCPREQUEST to try to reclaim the current
1971 address. */
1972 if (client->last_addr && !client->anonymize)
1973 client->state = DHCP_STATE_INIT_REBOOT;
1974
1975 r = client_start(client);
1976 if (r >= 0)
1977 log_dhcp_client(client, "STARTED on ifindex %i", client->ifindex);
1978
1979 return r;
1980 }
1981
1982 int sd_dhcp_client_send_release(sd_dhcp_client *client) {
1983 assert_return(client, -EINVAL);
1984 assert_return(client->state != DHCP_STATE_STOPPED, -ESTALE);
1985 assert_return(client->lease, -EUNATCH);
1986
1987 _cleanup_free_ DHCPPacket *release = NULL;
1988 size_t optoffset, optlen;
1989 int r;
1990
1991 r = client_message_init(client, &release, DHCP_RELEASE, &optlen, &optoffset);
1992 if (r < 0)
1993 return r;
1994
1995 /* Fill up release IP and MAC */
1996 release->dhcp.ciaddr = client->lease->address;
1997 memcpy(&release->dhcp.chaddr, &client->mac_addr, client->mac_addr_len);
1998
1999 r = dhcp_option_append(&release->dhcp, optlen, &optoffset, 0,
2000 SD_DHCP_OPTION_END, 0, NULL);
2001 if (r < 0)
2002 return r;
2003
2004 r = dhcp_network_send_udp_socket(client->fd,
2005 client->lease->server_address,
2006 DHCP_PORT_SERVER,
2007 &release->dhcp,
2008 sizeof(DHCPMessage) + optoffset);
2009 if (r < 0)
2010 return r;
2011
2012 log_dhcp_client(client, "RELEASE");
2013
2014 return 0;
2015 }
2016
2017 int sd_dhcp_client_stop(sd_dhcp_client *client) {
2018 DHCP_CLIENT_DONT_DESTROY(client);
2019
2020 assert_return(client, -EINVAL);
2021
2022 client_stop(client, SD_DHCP_CLIENT_EVENT_STOP);
2023 client->state = DHCP_STATE_STOPPED;
2024
2025 return 0;
2026 }
2027
2028 int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int64_t priority) {
2029 int r;
2030
2031 assert_return(client, -EINVAL);
2032 assert_return(!client->event, -EBUSY);
2033
2034 if (event)
2035 client->event = sd_event_ref(event);
2036 else {
2037 r = sd_event_default(&client->event);
2038 if (r < 0)
2039 return 0;
2040 }
2041
2042 client->event_priority = priority;
2043
2044 return 0;
2045 }
2046
2047 int sd_dhcp_client_detach_event(sd_dhcp_client *client) {
2048 assert_return(client, -EINVAL);
2049
2050 client->event = sd_event_unref(client->event);
2051
2052 return 0;
2053 }
2054
2055 sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
2056 assert_return(client, NULL);
2057
2058 return client->event;
2059 }
2060
2061 static sd_dhcp_client *dhcp_client_free(sd_dhcp_client *client) {
2062 if (!client)
2063 return NULL;
2064
2065 log_dhcp_client(client, "FREE");
2066
2067 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
2068 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
2069 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
2070 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
2071
2072 client_initialize(client);
2073
2074 sd_dhcp_client_detach_event(client);
2075
2076 sd_dhcp_lease_unref(client->lease);
2077
2078 free(client->req_opts);
2079 free(client->hostname);
2080 free(client->vendor_class_identifier);
2081 client->user_class = strv_free(client->user_class);
2082 ordered_hashmap_free(client->options);
2083 return mfree(client);
2084 }
2085
2086 DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_client, sd_dhcp_client, dhcp_client_free);
2087
2088 int sd_dhcp_client_new(sd_dhcp_client **ret, int anonymize) {
2089 assert_return(ret, -EINVAL);
2090
2091 _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = new(sd_dhcp_client, 1);
2092 if (!client)
2093 return -ENOMEM;
2094
2095 *client = (sd_dhcp_client) {
2096 .n_ref = 1,
2097 .state = DHCP_STATE_INIT,
2098 .ifindex = -1,
2099 .fd = -1,
2100 .mtu = DHCP_DEFAULT_MIN_SIZE,
2101 .port = DHCP_PORT_CLIENT,
2102 .anonymize = !!anonymize,
2103 .max_attempts = (uint64_t) -1,
2104 .ip_service_type = -1,
2105 };
2106 /* NOTE: this could be moved to a function. */
2107 if (anonymize) {
2108 client->req_opts_size = ELEMENTSOF(default_req_opts_anonymize);
2109 client->req_opts = memdup(default_req_opts_anonymize, client->req_opts_size);
2110 } else {
2111 client->req_opts_size = ELEMENTSOF(default_req_opts);
2112 client->req_opts = memdup(default_req_opts, client->req_opts_size);
2113 }
2114 if (!client->req_opts)
2115 return -ENOMEM;
2116
2117 *ret = TAKE_PTR(client);
2118
2119 return 0;
2120 }
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