2 This file is part of systemd.
4 Copyright (C) 2013 Intel Corporation. All rights reserved.
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <net/ethernet.h>
25 #include <sys/param.h>
26 #include <sys/ioctl.h>
31 #include "dhcp-protocol.h"
32 #include "dhcp-internal.h"
33 #include "dhcp-lease-internal.h"
34 #include "sd-dhcp-client.h"
36 struct sd_dhcp_client {
40 sd_event_source *timeout_resend;
43 union sockaddr_union link;
44 sd_event_source *receive_message;
46 size_t req_opts_allocated;
51 struct ether_addr mac_addr;
58 sd_event_source *timeout_t1;
59 sd_event_source *timeout_t2;
60 sd_event_source *timeout_expire;
61 sd_dhcp_client_cb_t cb;
66 static const uint8_t default_req_opts[] = {
67 DHCP_OPTION_SUBNET_MASK,
69 DHCP_OPTION_HOST_NAME,
70 DHCP_OPTION_DOMAIN_NAME,
71 DHCP_OPTION_DOMAIN_NAME_SERVER,
72 DHCP_OPTION_NTP_SERVER,
75 static int client_receive_message_raw(sd_event_source *s, int fd,
76 uint32_t revents, void *userdata);
77 static int client_receive_message_udp(sd_event_source *s, int fd,
78 uint32_t revents, void *userdata);
80 int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
82 assert_return(client, -EINVAL);
85 client->userdata = userdata;
90 int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
93 assert_return(client, -EINVAL);
94 assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
98 case DHCP_OPTION_OVERLOAD:
99 case DHCP_OPTION_MESSAGE_TYPE:
100 case DHCP_OPTION_PARAMETER_REQUEST_LIST:
101 case DHCP_OPTION_END:
108 for (i = 0; i < client->req_opts_size; i++)
109 if (client->req_opts[i] == option)
112 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
113 client->req_opts_size + 1))
116 client->req_opts[client->req_opts_size++] = option;
121 int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
122 const struct in_addr *last_addr) {
123 assert_return(client, -EINVAL);
124 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
127 client->last_addr = last_addr->s_addr;
129 client->last_addr = INADDR_ANY;
134 int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) {
135 assert_return(client, -EINVAL);
136 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
137 assert_return(interface_index >= -1, -EINVAL);
139 client->index = interface_index;
144 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
145 const struct ether_addr *addr) {
146 assert_return(client, -EINVAL);
147 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
149 log_dhcp_client(client, "set MAC address to "
150 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
151 addr->ether_addr_octet[0],
152 addr->ether_addr_octet[1],
153 addr->ether_addr_octet[2],
154 addr->ether_addr_octet[3],
155 addr->ether_addr_octet[4],
156 addr->ether_addr_octet[5]);
158 memcpy(&client->client_id.mac_addr, addr, ETH_ALEN);
159 client->client_id.type = 0x01;
164 int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
165 assert_return(client, -EINVAL);
166 assert_return(ret, -EINVAL);
168 if (client->state != DHCP_STATE_BOUND &&
169 client->state != DHCP_STATE_RENEWING &&
170 client->state != DHCP_STATE_REBINDING)
171 return -EADDRNOTAVAIL;
173 *ret = sd_dhcp_lease_ref(client->lease);
178 static int client_notify(sd_dhcp_client *client, int event) {
180 client->cb(client, event, client->userdata);
185 static int client_initialize(sd_dhcp_client *client) {
186 assert_return(client, -EINVAL);
188 client->receive_message =
189 sd_event_source_unref(client->receive_message);
191 client->fd = safe_close(client->fd);
193 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
195 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
196 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
197 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
201 client->start_time = 0;
203 client->state = DHCP_STATE_INIT;
207 client->lease = sd_dhcp_lease_unref(client->lease);
212 static int client_stop(sd_dhcp_client *client, int error) {
213 assert_return(client, -EINVAL);
215 client_notify(client, error);
217 client_initialize(client);
219 log_dhcp_client(client, "STOPPED");
224 static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
225 uint8_t type, uint8_t **opt, size_t *optlen) {
229 assert(client->secs);
234 r = dhcp_message_init(message, BOOTREQUEST, client->xid, type, opt,
239 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
240 refuse to issue an DHCP lease if 'secs' is set to zero */
241 message->secs = htobe16(client->secs);
243 memcpy(&message->chaddr, &client->client_id.mac_addr, ETH_ALEN);
245 if (client->state == DHCP_STATE_RENEWING ||
246 client->state == DHCP_STATE_REBINDING)
247 message->ciaddr = client->lease->address;
249 /* Some DHCP servers will refuse to issue an DHCP lease if the Client
250 Identifier option is not set */
251 r = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
252 sizeof(client->client_id), &client->client_id);
256 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
259 r = dhcp_option_append(opt, optlen,
260 DHCP_OPTION_PARAMETER_REQUEST_LIST,
261 client->req_opts_size,
266 /* Some DHCP servers will send bigger DHCP packets than the
267 defined default size unless the Maximum Messge Size option
268 is explicitely set */
269 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
270 DHCP_MIN_OPTIONS_SIZE);
271 r = dhcp_option_append(opt, optlen,
272 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
281 static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet,
283 dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT,
284 INADDR_BROADCAST, DHCP_PORT_SERVER, len);
286 return dhcp_network_send_raw_socket(client->fd, &client->link,
290 static int client_send_discover(sd_dhcp_client *client) {
291 _cleanup_free_ DHCPPacket *discover;
299 r = sd_event_get_now_monotonic(client->event, &time_now);
302 assert(time_now >= client->start_time);
304 /* seconds between sending first and last DISCOVER
305 * must always be strictly positive to deal with broken servers */
306 client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
308 optlen = DHCP_MIN_OPTIONS_SIZE;
309 len = sizeof(DHCPPacket) + optlen;
311 discover = malloc0(len);
315 r = client_message_init(client, &discover->dhcp, DHCP_DISCOVER,
320 if (client->last_addr != INADDR_ANY) {
321 r = dhcp_option_append(&opt, &optlen,
322 DHCP_OPTION_REQUESTED_IP_ADDRESS,
323 4, &client->last_addr);
328 r = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
332 r = dhcp_client_send_raw(client, discover, len - optlen);
336 log_dhcp_client(client, "DISCOVER");
341 static int client_send_request(sd_dhcp_client *client) {
342 _cleanup_free_ DHCPPacket *request;
347 optlen = DHCP_MIN_OPTIONS_SIZE;
348 len = sizeof(DHCPPacket) + optlen;
350 request = malloc0(len);
354 r = client_message_init(client, &request->dhcp, DHCP_REQUEST, &opt,
359 switch (client->state) {
361 case DHCP_STATE_INIT_REBOOT:
362 r = dhcp_option_append(&opt, &optlen,
363 DHCP_OPTION_REQUESTED_IP_ADDRESS,
364 4, &client->last_addr);
369 case DHCP_STATE_REQUESTING:
370 r = dhcp_option_append(&opt, &optlen,
371 DHCP_OPTION_REQUESTED_IP_ADDRESS,
372 4, &client->lease->address);
376 r = dhcp_option_append(&opt, &optlen,
377 DHCP_OPTION_SERVER_IDENTIFIER,
378 4, &client->lease->server_address);
383 case DHCP_STATE_INIT:
384 case DHCP_STATE_SELECTING:
385 case DHCP_STATE_REBOOTING:
386 case DHCP_STATE_BOUND:
387 case DHCP_STATE_RENEWING:
388 case DHCP_STATE_REBINDING:
393 r = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
397 if (client->state == DHCP_STATE_RENEWING) {
398 r = dhcp_network_send_udp_socket(client->fd,
399 client->lease->server_address,
402 len - optlen - DHCP_IP_UDP_SIZE);
404 r = dhcp_client_send_raw(client, request, len - optlen);
409 log_dhcp_client(client, "REQUEST");
414 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
416 sd_dhcp_client *client = userdata;
417 usec_t next_timeout = 0;
424 assert(client->event);
426 r = sd_event_get_now_monotonic(client->event, &time_now);
430 switch (client->state) {
431 case DHCP_STATE_RENEWING:
433 time_left = (client->lease->t2 - client->lease->t1) / 2;
437 next_timeout = time_now + time_left * USEC_PER_SEC;
441 case DHCP_STATE_REBINDING:
443 time_left = (client->lease->lifetime - client->lease->t2) / 2;
447 next_timeout = time_now + time_left * USEC_PER_SEC;
450 case DHCP_STATE_REBOOTING:
451 /* start over as we did not receive a timely ack or nak */
452 client->state = DHCP_STATE_INIT;
454 client->xid = random_u32();
457 case DHCP_STATE_INIT:
458 case DHCP_STATE_INIT_REBOOT:
459 case DHCP_STATE_SELECTING:
460 case DHCP_STATE_REQUESTING:
461 case DHCP_STATE_BOUND:
463 if (client->attempt < 64)
464 client->attempt *= 2;
466 next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC;
471 next_timeout += (random_u32() & 0x1fffff);
473 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
475 r = sd_event_add_monotonic(client->event,
476 &client->timeout_resend,
479 client_timeout_resend, client);
483 r = sd_event_source_set_priority(client->timeout_resend,
484 client->event_priority);
488 switch (client->state) {
489 case DHCP_STATE_INIT:
490 r = client_send_discover(client);
492 client->state = DHCP_STATE_SELECTING;
495 if (client->attempt >= 64)
501 case DHCP_STATE_SELECTING:
502 r = client_send_discover(client);
503 if (r < 0 && client->attempt >= 64)
508 case DHCP_STATE_INIT_REBOOT:
509 case DHCP_STATE_REQUESTING:
510 case DHCP_STATE_RENEWING:
511 case DHCP_STATE_REBINDING:
512 r = client_send_request(client);
513 if (r < 0 && client->attempt >= 64)
516 if (client->state == DHCP_STATE_INIT_REBOOT)
517 client->state = DHCP_STATE_REBOOTING;
519 client->request_sent = time_now;
523 case DHCP_STATE_REBOOTING:
524 case DHCP_STATE_BOUND:
532 client_stop(client, r);
534 /* Errors were dealt with when stopping the client, don't spill
535 errors into the event loop handler */
539 static int client_initialize_events(sd_dhcp_client *client,
540 sd_event_io_handler_t io_callback) {
544 assert(client->event);
546 r = sd_event_add_io(client->event, &client->receive_message,
547 client->fd, EPOLLIN, io_callback,
552 r = sd_event_source_set_priority(client->receive_message,
553 client->event_priority);
557 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
559 r = sd_event_add_monotonic(client->event,
560 &client->timeout_resend, 0, 0,
561 client_timeout_resend, client);
565 r = sd_event_source_set_priority(client->timeout_resend,
566 client->event_priority);
570 client_stop(client, r);
576 static int client_start(sd_dhcp_client *client) {
579 assert_return(client, -EINVAL);
580 assert_return(client->event, -EINVAL);
581 assert_return(client->index > 0, -EINVAL);
582 assert_return(client->fd < 0, -EBUSY);
583 assert_return(client->xid == 0, -EINVAL);
584 assert_return(client->state == DHCP_STATE_INIT ||
585 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
587 client->xid = random_u32();
589 r = dhcp_network_bind_raw_socket(client->index, &client->link);
592 client_stop(client, r);
597 client->start_time = now(CLOCK_MONOTONIC);
600 log_dhcp_client(client, "STARTED");
602 return client_initialize_events(client, client_receive_message_raw);
605 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
607 sd_dhcp_client *client = userdata;
609 log_dhcp_client(client, "EXPIRED");
611 client_notify(client, DHCP_EVENT_EXPIRED);
613 /* start over as the lease was lost */
614 client_initialize(client);
615 client_start(client);
620 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
621 sd_dhcp_client *client = userdata;
624 client->receive_message = sd_event_source_unref(client->receive_message);
625 client->fd = safe_close(client->fd);
627 client->state = DHCP_STATE_REBINDING;
630 r = dhcp_network_bind_raw_socket(client->index, &client->link);
632 client_stop(client, r);
638 log_dhcp_client(client, "TIMEOUT T2");
640 return client_initialize_events(client, client_receive_message_raw);
643 static int client_timeout_t1(sd_event_source *s, uint64_t usec,
645 sd_dhcp_client *client = userdata;
648 client->state = DHCP_STATE_RENEWING;
651 r = dhcp_network_bind_udp_socket(client->index,
652 client->lease->address,
655 client_stop(client, r);
661 log_dhcp_client(client, "TIMEOUT T1");
663 return client_initialize_events(client, client_receive_message_udp);
666 static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer,
668 _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
671 r = dhcp_lease_new(&lease);
675 r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease);
679 lease->next_server = offer->siaddr;
681 lease->address = offer->yiaddr;
683 if (lease->address == INADDR_ANY ||
684 lease->server_address == INADDR_ANY ||
685 lease->subnet_mask == INADDR_ANY ||
686 lease->lifetime == 0)
689 client->lease = lease;
692 log_dhcp_client(client, "OFFER");
697 static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack,
699 _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
702 r = dhcp_lease_new(&lease);
706 r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease);
708 log_dhcp_client(client, "NAK");
709 return DHCP_EVENT_NO_LEASE;
715 lease->next_server = ack->siaddr;
717 lease->address = ack->yiaddr;
719 if (lease->address == INADDR_ANY ||
720 lease->server_address == INADDR_ANY ||
721 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
724 r = DHCP_EVENT_IP_ACQUIRE;
726 if (client->lease->address != lease->address ||
727 client->lease->subnet_mask != lease->subnet_mask ||
728 client->lease->router != lease->router) {
729 r = DHCP_EVENT_IP_CHANGE;
732 client->lease = sd_dhcp_lease_unref(client->lease);
735 client->lease = lease;
738 log_dhcp_client(client, "ACK");
743 static uint64_t client_compute_timeout(uint64_t request_sent,
745 return request_sent + (lifetime - 3) * USEC_PER_SEC +
746 + (random_u32() & 0x1fffff);
749 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) {
750 uint64_t next_timeout;
754 assert(client->event);
756 /* don't set timers for infinite leases */
757 if (client->lease->lifetime == 0xffffffff)
760 if (client->lease->lifetime < 10)
763 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
764 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
765 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
767 if (!client->lease->t1)
768 client->lease->t1 = client->lease->lifetime / 2;
770 next_timeout = client_compute_timeout(client->request_sent,
772 if (next_timeout < usec)
775 r = sd_event_add_monotonic(client->event,
779 client_timeout_t1, client);
783 r = sd_event_source_set_priority(client->timeout_t1,
784 client->event_priority);
788 if (!client->lease->t2)
789 client->lease->t2 = client->lease->lifetime * 7 / 8;
791 if (client->lease->t2 < client->lease->t1)
794 if (client->lease->lifetime < client->lease->t2)
797 next_timeout = client_compute_timeout(client->request_sent,
799 if (next_timeout < usec)
802 r = sd_event_add_monotonic(client->event,
806 client_timeout_t2, client);
810 r = sd_event_source_set_priority(client->timeout_t2,
811 client->event_priority);
815 next_timeout = client_compute_timeout(client->request_sent,
816 client->lease->lifetime);
817 if (next_timeout < usec)
820 r = sd_event_add_monotonic(client->event,
821 &client->timeout_expire, next_timeout,
823 client_timeout_expire, client);
827 r = sd_event_source_set_priority(client->timeout_expire,
828 client->event_priority);
835 static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
836 int len, usec_t time_now) {
837 int r = 0, notify_event = 0;
840 assert(client->event);
843 if (len < DHCP_MESSAGE_SIZE) {
844 log_dhcp_client(client, "message too small (%d bytes): "
849 if (message->op != BOOTREPLY) {
850 log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
854 if (be32toh(message->xid) != client->xid) {
855 log_dhcp_client(client, "received xid (%u) does not match "
856 "expected (%u): ignoring",
857 be32toh(message->xid), client->xid);
861 if (memcmp(&message->chaddr[0], &client->client_id.mac_addr,
863 log_dhcp_client(client, "received chaddr does not match "
864 "expected: ignoring");
868 switch (client->state) {
869 case DHCP_STATE_SELECTING:
871 r = client_handle_offer(client, message, len);
874 client->timeout_resend =
875 sd_event_source_unref(client->timeout_resend);
877 client->state = DHCP_STATE_REQUESTING;
880 r = sd_event_add_monotonic(client->event,
881 &client->timeout_resend, 0,
882 0, client_timeout_resend,
887 r = sd_event_source_set_priority(client->timeout_resend,
888 client->event_priority);
895 case DHCP_STATE_REBOOTING:
896 case DHCP_STATE_REQUESTING:
897 case DHCP_STATE_RENEWING:
898 case DHCP_STATE_REBINDING:
900 r = client_handle_ack(client, message, len);
902 if (r == DHCP_EVENT_NO_LEASE) {
904 client->timeout_resend =
905 sd_event_source_unref(client->timeout_resend);
907 if (client->state == DHCP_STATE_REBOOTING) {
908 r = client_initialize(client);
912 r = client_start(client);
921 client->timeout_resend =
922 sd_event_source_unref(client->timeout_resend);
924 if (IN_SET(client->state, DHCP_STATE_REQUESTING,
925 DHCP_STATE_REBOOTING))
926 notify_event = DHCP_EVENT_IP_ACQUIRE;
927 else if (r != DHCP_EVENT_IP_ACQUIRE)
930 client->state = DHCP_STATE_BOUND;
933 client->last_addr = client->lease->address;
935 r = client_set_lease_timeouts(client, time_now);
940 client_notify(client, notify_event);
942 client->receive_message =
943 sd_event_source_unref(client->receive_message);
944 client->fd = safe_close(client->fd);
951 case DHCP_STATE_INIT:
952 case DHCP_STATE_INIT_REBOOT:
953 case DHCP_STATE_BOUND:
959 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
960 return client_stop(client, r);
965 static int client_receive_message_udp(sd_event_source *s, int fd,
966 uint32_t revents, void *userdata) {
967 sd_dhcp_client *client = userdata;
968 _cleanup_free_ DHCPMessage *message = NULL;
969 int buflen = 0, len, r;
974 assert(client->event);
976 r = ioctl(fd, FIONREAD, &buflen);
977 if (r < 0 || buflen <= 0)
978 buflen = sizeof(DHCPMessage) + DHCP_MIN_OPTIONS_SIZE;
980 message = malloc0(buflen);
984 len = read(fd, message, buflen);
988 r = sd_event_get_now_monotonic(client->event, &time_now);
990 return client_stop(client, r);
992 return client_handle_message(client, message, len,
996 static int client_receive_message_raw(sd_event_source *s, int fd,
997 uint32_t revents, void *userdata) {
998 sd_dhcp_client *client = userdata;
999 _cleanup_free_ DHCPPacket *packet = NULL;
1001 uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))];
1002 struct iovec iov = {};
1003 struct msghdr msg = {
1006 .msg_control = cmsgbuf,
1007 .msg_controllen = sizeof(cmsgbuf),
1009 struct cmsghdr *cmsg;
1010 bool checksum = true;
1011 int buflen = 0, len, r;
1015 assert(client->event);
1017 r = ioctl(fd, FIONREAD, &buflen);
1018 if (r < 0 || buflen <= 0)
1019 buflen = sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE;
1021 packet = malloc0(buflen);
1025 iov.iov_base = packet;
1026 iov.iov_len = buflen;
1028 len = recvmsg(fd, &msg, 0);
1030 log_dhcp_client(client, "could not receive message from raw "
1031 "socket: %s", strerror(errno));
1035 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
1036 if (cmsg->cmsg_level == SOL_PACKET && cmsg->cmsg_type == PACKET_AUXDATA) {
1037 struct tpacket_auxdata *aux = (void *)CMSG_DATA(cmsg);
1039 checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
1044 r = dhcp_packet_verify_headers(packet, len, checksum);
1048 len -= DHCP_IP_UDP_SIZE;
1050 r = sd_event_get_now_monotonic(client->event, &time_now);
1052 return client_stop(client, r);
1054 return client_handle_message(client, &packet->dhcp, len, time_now);
1057 int sd_dhcp_client_start(sd_dhcp_client *client) {
1060 assert_return(client, -EINVAL);
1062 r = client_initialize(client);
1066 if (client->last_addr)
1067 client->state = DHCP_STATE_INIT_REBOOT;
1069 return client_start(client);
1072 int sd_dhcp_client_stop(sd_dhcp_client *client) {
1073 return client_stop(client, DHCP_EVENT_STOP);
1076 int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event,
1080 assert_return(client, -EINVAL);
1081 assert_return(!client->event, -EBUSY);
1084 client->event = sd_event_ref(event);
1086 r = sd_event_default(&client->event);
1091 client->event_priority = priority;
1096 int sd_dhcp_client_detach_event(sd_dhcp_client *client) {
1097 assert_return(client, -EINVAL);
1099 client->event = sd_event_unref(client->event);
1104 sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
1108 return client->event;
1111 void sd_dhcp_client_free(sd_dhcp_client *client) {
1115 sd_dhcp_client_stop(client);
1116 sd_dhcp_client_detach_event(client);
1118 free(client->req_opts);
1122 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free);
1123 #define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep)
1125 int sd_dhcp_client_new(sd_dhcp_client **ret) {
1126 _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
1128 assert_return(ret, -EINVAL);
1130 client = new0(sd_dhcp_client, 1);
1134 client->state = DHCP_STATE_INIT;
1137 client->attempt = 1;
1139 client->req_opts_size = ELEMENTSOF(default_req_opts);
1141 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1142 if (!client->req_opts)