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;
49 struct ether_addr mac_addr;
55 sd_event_source *timeout_t1;
56 sd_event_source *timeout_t2;
57 sd_event_source *timeout_expire;
58 sd_dhcp_client_cb_t cb;
63 static const uint8_t default_req_opts[] = {
64 DHCP_OPTION_SUBNET_MASK,
66 DHCP_OPTION_HOST_NAME,
67 DHCP_OPTION_DOMAIN_NAME,
68 DHCP_OPTION_DOMAIN_NAME_SERVER,
69 DHCP_OPTION_NTP_SERVER,
72 static int client_receive_message_raw(sd_event_source *s, int fd,
73 uint32_t revents, void *userdata);
74 static int client_receive_message_udp(sd_event_source *s, int fd,
75 uint32_t revents, void *userdata);
77 int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
79 assert_return(client, -EINVAL);
82 client->userdata = userdata;
87 int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
90 assert_return(client, -EINVAL);
91 assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
95 case DHCP_OPTION_OVERLOAD:
96 case DHCP_OPTION_MESSAGE_TYPE:
97 case DHCP_OPTION_PARAMETER_REQUEST_LIST:
105 for (i = 0; i < client->req_opts_size; i++)
106 if (client->req_opts[i] == option)
109 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
110 client->req_opts_size + 1))
113 client->req_opts[client->req_opts_size++] = option;
118 int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
119 const struct in_addr *last_addr) {
120 assert_return(client, -EINVAL);
121 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
124 client->last_addr = last_addr->s_addr;
126 client->last_addr = INADDR_ANY;
131 int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) {
132 assert_return(client, -EINVAL);
133 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
134 assert_return(interface_index >= -1, -EINVAL);
136 client->index = interface_index;
141 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
142 const struct ether_addr *addr) {
143 assert_return(client, -EINVAL);
144 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
146 log_dhcp_client(client, "set MAC address to "
147 "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
148 addr->ether_addr_octet[0],
149 addr->ether_addr_octet[1],
150 addr->ether_addr_octet[2],
151 addr->ether_addr_octet[3],
152 addr->ether_addr_octet[4],
153 addr->ether_addr_octet[5]);
155 memcpy(&client->mac_addr, addr, ETH_ALEN);
160 int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
161 assert_return(client, -EINVAL);
162 assert_return(ret, -EINVAL);
164 if (client->state != DHCP_STATE_BOUND &&
165 client->state != DHCP_STATE_RENEWING &&
166 client->state != DHCP_STATE_REBINDING)
167 return -EADDRNOTAVAIL;
169 *ret = sd_dhcp_lease_ref(client->lease);
174 static int client_notify(sd_dhcp_client *client, int event) {
176 client->cb(client, event, client->userdata);
181 static int client_initialize(sd_dhcp_client *client) {
182 assert_return(client, -EINVAL);
184 client->receive_message =
185 sd_event_source_unref(client->receive_message);
187 client->fd = safe_close(client->fd);
189 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
191 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
192 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
193 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
197 client->start_time = 0;
199 client->state = DHCP_STATE_INIT;
203 client->lease = sd_dhcp_lease_unref(client->lease);
208 static int client_stop(sd_dhcp_client *client, int error) {
209 assert_return(client, -EINVAL);
211 client_notify(client, error);
213 client_initialize(client);
215 log_dhcp_client(client, "STOPPED");
220 static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
221 uint8_t type, uint16_t secs, uint8_t **opt,
227 r = dhcp_message_init(message, BOOTREQUEST, client->xid, type, opt,
232 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
233 refuse to issue an DHCP lease if 'secs' is set to zero */
234 message->secs = htobe16(secs);
236 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
238 if (client->state == DHCP_STATE_RENEWING ||
239 client->state == DHCP_STATE_REBINDING)
240 message->ciaddr = client->lease->address;
242 /* Some DHCP servers will refuse to issue an DHCP lease if the Client
243 Identifier option is not set */
244 r = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
245 ETH_ALEN, &client->mac_addr);
249 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
252 r = dhcp_option_append(opt, optlen,
253 DHCP_OPTION_PARAMETER_REQUEST_LIST,
254 client->req_opts_size,
259 /* Some DHCP servers will send bigger DHCP packets than the
260 defined default size unless the Maximum Messge Size option
261 is explicitely set */
262 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
263 DHCP_MIN_OPTIONS_SIZE);
264 r = dhcp_option_append(opt, optlen,
265 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
274 static int dhcp_client_send_raw(sd_dhcp_client *client, DHCPPacket *packet,
276 dhcp_packet_append_ip_headers(packet, INADDR_ANY, DHCP_PORT_CLIENT,
277 INADDR_BROADCAST, DHCP_PORT_SERVER, len);
279 return dhcp_network_send_raw_socket(client->fd, &client->link,
283 static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
285 _cleanup_free_ DHCPPacket *discover;
289 optlen = DHCP_MIN_OPTIONS_SIZE;
290 len = sizeof(DHCPPacket) + optlen;
292 discover = malloc0(len);
297 err = client_message_init(client, &discover->dhcp, DHCP_DISCOVER,
298 secs, &opt, &optlen);
302 if (client->last_addr != INADDR_ANY) {
303 err = dhcp_option_append(&opt, &optlen,
304 DHCP_OPTION_REQUESTED_IP_ADDRESS,
305 4, &client->last_addr);
310 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
314 err = dhcp_client_send_raw(client, discover, len);
318 log_dhcp_client(client, "DISCOVER");
323 static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
324 _cleanup_free_ DHCPPacket *request;
329 optlen = DHCP_MIN_OPTIONS_SIZE;
330 len = sizeof(DHCPPacket) + optlen;
332 request = malloc0(len);
336 err = client_message_init(client, &request->dhcp, DHCP_REQUEST, secs,
341 switch (client->state) {
343 case DHCP_STATE_INIT_REBOOT:
344 err = dhcp_option_append(&opt, &optlen,
345 DHCP_OPTION_REQUESTED_IP_ADDRESS,
346 4, &client->last_addr);
351 case DHCP_STATE_REQUESTING:
352 err = dhcp_option_append(&opt, &optlen,
353 DHCP_OPTION_REQUESTED_IP_ADDRESS,
354 4, &client->lease->address);
358 err = dhcp_option_append(&opt, &optlen,
359 DHCP_OPTION_SERVER_IDENTIFIER,
360 4, &client->lease->server_address);
365 case DHCP_STATE_INIT:
366 case DHCP_STATE_SELECTING:
367 case DHCP_STATE_REBOOTING:
368 case DHCP_STATE_BOUND:
369 case DHCP_STATE_RENEWING:
370 case DHCP_STATE_REBINDING:
375 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
379 if (client->state == DHCP_STATE_RENEWING) {
380 err = dhcp_network_send_udp_socket(client->fd,
381 client->lease->server_address,
384 len - DHCP_IP_UDP_SIZE);
386 err = dhcp_client_send_raw(client, request, len);
391 log_dhcp_client(client, "REQUEST");
396 static uint16_t client_update_secs(sd_dhcp_client *client, usec_t time_now)
398 client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
403 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
405 sd_dhcp_client *client = userdata;
406 usec_t next_timeout = 0;
413 assert(client->event);
415 r = sd_event_get_now_monotonic(client->event, &time_now);
419 switch (client->state) {
420 case DHCP_STATE_RENEWING:
422 time_left = (client->lease->t2 - client->lease->t1) / 2;
426 next_timeout = time_now + time_left * USEC_PER_SEC;
430 case DHCP_STATE_REBINDING:
432 time_left = (client->lease->lifetime - client->lease->t2) / 2;
436 next_timeout = time_now + time_left * USEC_PER_SEC;
439 case DHCP_STATE_REBOOTING:
440 /* start over as we did not receive a timely ack or nak */
441 client->state = DHCP_STATE_INIT;
443 client->xid = random_u32();
446 case DHCP_STATE_INIT:
447 case DHCP_STATE_INIT_REBOOT:
448 case DHCP_STATE_SELECTING:
449 case DHCP_STATE_REQUESTING:
450 case DHCP_STATE_BOUND:
452 if (client->attempt < 64)
453 client->attempt *= 2;
455 next_timeout = time_now + (client->attempt - 1) * USEC_PER_SEC;
460 next_timeout += (random_u32() & 0x1fffff);
462 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
464 r = sd_event_add_monotonic(client->event,
465 &client->timeout_resend,
468 client_timeout_resend, client);
472 r = sd_event_source_set_priority(client->timeout_resend,
473 client->event_priority);
477 switch (client->state) {
478 case DHCP_STATE_INIT:
480 client_update_secs(client, time_now);
482 r = client_send_discover(client, client->secs);
484 client->state = DHCP_STATE_SELECTING;
487 if (client->attempt >= 64)
493 case DHCP_STATE_SELECTING:
494 client_update_secs(client, time_now);
496 r = client_send_discover(client, client->secs);
497 if (r < 0 && client->attempt >= 64)
502 case DHCP_STATE_INIT_REBOOT:
503 case DHCP_STATE_REQUESTING:
504 case DHCP_STATE_RENEWING:
505 case DHCP_STATE_REBINDING:
506 r = client_send_request(client, client->secs);
507 if (r < 0 && client->attempt >= 64)
510 if (client->state == DHCP_STATE_INIT_REBOOT)
511 client->state = DHCP_STATE_REBOOTING;
513 client->request_sent = time_now;
517 case DHCP_STATE_REBOOTING:
518 case DHCP_STATE_BOUND:
526 client_stop(client, r);
528 /* Errors were dealt with when stopping the client, don't spill
529 errors into the event loop handler */
533 static int client_initialize_events(sd_dhcp_client *client,
534 sd_event_io_handler_t io_callback) {
538 assert(client->event);
540 r = sd_event_add_io(client->event, &client->receive_message,
541 client->fd, EPOLLIN, io_callback,
546 r = sd_event_source_set_priority(client->receive_message,
547 client->event_priority);
551 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
553 r = sd_event_add_monotonic(client->event,
554 &client->timeout_resend, 0, 0,
555 client_timeout_resend, client);
559 r = sd_event_source_set_priority(client->timeout_resend,
560 client->event_priority);
564 client_stop(client, r);
570 static int client_start(sd_dhcp_client *client) {
573 assert_return(client, -EINVAL);
574 assert_return(client->event, -EINVAL);
575 assert_return(client->index > 0, -EINVAL);
576 assert_return(client->fd < 0, -EBUSY);
577 assert_return(client->xid == 0, -EINVAL);
578 assert_return(client->state == DHCP_STATE_INIT ||
579 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
581 client->xid = random_u32();
583 r = dhcp_network_bind_raw_socket(client->index, &client->link);
586 client_stop(client, r);
591 client->start_time = now(CLOCK_MONOTONIC);
594 log_dhcp_client(client, "STARTED");
596 return client_initialize_events(client, client_receive_message_raw);
599 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
601 sd_dhcp_client *client = userdata;
603 log_dhcp_client(client, "EXPIRED");
605 client_notify(client, DHCP_EVENT_EXPIRED);
607 /* start over as the lease was lost */
608 client_initialize(client);
609 client_start(client);
614 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
615 sd_dhcp_client *client = userdata;
618 client->receive_message = sd_event_source_unref(client->receive_message);
619 client->fd = safe_close(client->fd);
621 client->state = DHCP_STATE_REBINDING;
624 r = dhcp_network_bind_raw_socket(client->index, &client->link);
626 client_stop(client, r);
632 log_dhcp_client(client, "TIMEOUT T2");
634 return client_initialize_events(client, client_receive_message_raw);
637 static int client_timeout_t1(sd_event_source *s, uint64_t usec,
639 sd_dhcp_client *client = userdata;
642 client->state = DHCP_STATE_RENEWING;
645 r = dhcp_network_bind_udp_socket(client->index,
646 client->lease->address,
649 client_stop(client, r);
655 log_dhcp_client(client, "TIMEOUT T1");
657 return client_initialize_events(client, client_receive_message_udp);
660 static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer,
662 _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
665 r = dhcp_lease_new(&lease);
669 r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease);
673 lease->next_server = offer->siaddr;
675 lease->address = offer->yiaddr;
677 if (lease->address == INADDR_ANY ||
678 lease->server_address == INADDR_ANY ||
679 lease->subnet_mask == INADDR_ANY ||
680 lease->lifetime == 0)
683 client->lease = lease;
686 log_dhcp_client(client, "OFFER");
691 static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack,
693 _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
696 r = dhcp_lease_new(&lease);
700 r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease);
702 log_dhcp_client(client, "NAK");
703 return DHCP_EVENT_NO_LEASE;
709 lease->next_server = ack->siaddr;
711 lease->address = ack->yiaddr;
713 if (lease->address == INADDR_ANY ||
714 lease->server_address == INADDR_ANY ||
715 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
718 r = DHCP_EVENT_IP_ACQUIRE;
720 if (client->lease->address != lease->address ||
721 client->lease->subnet_mask != lease->subnet_mask ||
722 client->lease->router != lease->router) {
723 r = DHCP_EVENT_IP_CHANGE;
726 client->lease = sd_dhcp_lease_unref(client->lease);
729 client->lease = lease;
732 log_dhcp_client(client, "ACK");
737 static uint64_t client_compute_timeout(uint64_t request_sent,
739 return request_sent + (lifetime - 3) * USEC_PER_SEC +
740 + (random_u32() & 0x1fffff);
743 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) {
744 uint64_t next_timeout;
748 assert(client->event);
750 /* don't set timers for infinite leases */
751 if (client->lease->lifetime == 0xffffffff)
754 if (client->lease->lifetime < 10)
757 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
758 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
759 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
761 if (!client->lease->t1)
762 client->lease->t1 = client->lease->lifetime / 2;
764 next_timeout = client_compute_timeout(client->request_sent,
766 if (next_timeout < usec)
769 r = sd_event_add_monotonic(client->event,
773 client_timeout_t1, client);
777 r = sd_event_source_set_priority(client->timeout_t1,
778 client->event_priority);
782 if (!client->lease->t2)
783 client->lease->t2 = client->lease->lifetime * 7 / 8;
785 if (client->lease->t2 < client->lease->t1)
788 if (client->lease->lifetime < client->lease->t2)
791 next_timeout = client_compute_timeout(client->request_sent,
793 if (next_timeout < usec)
796 r = sd_event_add_monotonic(client->event,
800 client_timeout_t2, client);
804 r = sd_event_source_set_priority(client->timeout_t2,
805 client->event_priority);
809 next_timeout = client_compute_timeout(client->request_sent,
810 client->lease->lifetime);
811 if (next_timeout < usec)
814 r = sd_event_add_monotonic(client->event,
815 &client->timeout_expire, next_timeout,
817 client_timeout_expire, client);
821 r = sd_event_source_set_priority(client->timeout_expire,
822 client->event_priority);
829 static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
830 int len, usec_t time_now) {
831 int r = 0, notify_event = 0;
834 assert(client->event);
837 if (len < DHCP_MESSAGE_SIZE) {
838 log_dhcp_client(client, "message too small (%d bytes): "
843 if (message->op != BOOTREPLY) {
844 log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
848 if (be32toh(message->xid) != client->xid) {
849 log_dhcp_client(client, "received xid (%u) does not match "
850 "expected (%u): ignoring",
851 be32toh(message->xid), client->xid);
855 if (memcmp(&message->chaddr[0], &client->mac_addr.ether_addr_octet,
857 log_dhcp_client(client, "received chaddr does not match "
858 "expected: ignoring");
862 switch (client->state) {
863 case DHCP_STATE_SELECTING:
865 r = client_handle_offer(client, message, len);
868 client->timeout_resend =
869 sd_event_source_unref(client->timeout_resend);
871 client->state = DHCP_STATE_REQUESTING;
874 r = sd_event_add_monotonic(client->event,
875 &client->timeout_resend, 0,
876 0, client_timeout_resend,
881 r = sd_event_source_set_priority(client->timeout_resend,
882 client->event_priority);
889 case DHCP_STATE_REBOOTING:
890 case DHCP_STATE_REQUESTING:
891 case DHCP_STATE_RENEWING:
892 case DHCP_STATE_REBINDING:
894 r = client_handle_ack(client, message, len);
896 if (r == DHCP_EVENT_NO_LEASE) {
898 client->timeout_resend =
899 sd_event_source_unref(client->timeout_resend);
901 if (client->state == DHCP_STATE_REBOOTING) {
902 r = client_initialize(client);
906 r = client_start(client);
915 client->timeout_resend =
916 sd_event_source_unref(client->timeout_resend);
918 if (IN_SET(client->state, DHCP_STATE_REQUESTING,
919 DHCP_STATE_REBOOTING))
920 notify_event = DHCP_EVENT_IP_ACQUIRE;
921 else if (r != DHCP_EVENT_IP_ACQUIRE)
924 client->state = DHCP_STATE_BOUND;
927 client->last_addr = client->lease->address;
929 r = client_set_lease_timeouts(client, time_now);
934 client_notify(client, notify_event);
936 client->receive_message =
937 sd_event_source_unref(client->receive_message);
938 client->fd = safe_close(client->fd);
945 case DHCP_STATE_INIT:
946 case DHCP_STATE_INIT_REBOOT:
947 case DHCP_STATE_BOUND:
953 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
954 return client_stop(client, r);
959 static int client_receive_message_udp(sd_event_source *s, int fd,
960 uint32_t revents, void *userdata) {
961 sd_dhcp_client *client = userdata;
962 _cleanup_free_ DHCPMessage *message = NULL;
963 int buflen = 0, len, r;
968 assert(client->event);
970 r = ioctl(fd, FIONREAD, &buflen);
971 if (r < 0 || buflen <= 0)
972 buflen = sizeof(DHCPMessage) + DHCP_MIN_OPTIONS_SIZE;
974 message = malloc0(buflen);
978 len = read(fd, message, buflen);
982 r = sd_event_get_now_monotonic(client->event, &time_now);
984 return client_stop(client, r);
986 return client_handle_message(client, message, len,
990 static int client_receive_message_raw(sd_event_source *s, int fd,
991 uint32_t revents, void *userdata) {
992 sd_dhcp_client *client = userdata;
993 _cleanup_free_ DHCPPacket *packet = NULL;
995 uint8_t cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))];
996 struct iovec iov = {};
997 struct msghdr msg = {
1000 .msg_control = cmsgbuf,
1001 .msg_controllen = sizeof(cmsgbuf),
1003 struct cmsghdr *cmsg;
1004 bool checksum = true;
1005 int buflen = 0, len, r;
1009 assert(client->event);
1011 r = ioctl(fd, FIONREAD, &buflen);
1012 if (r < 0 || buflen <= 0)
1013 buflen = sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE;
1015 packet = malloc0(buflen);
1019 iov.iov_base = packet;
1020 iov.iov_len = buflen;
1022 len = recvmsg(fd, &msg, 0);
1024 log_dhcp_client(client, "could not receive message from raw "
1025 "socket: %s", strerror(errno));
1029 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
1030 if (cmsg->cmsg_level == SOL_PACKET && cmsg->cmsg_type == PACKET_AUXDATA) {
1031 struct tpacket_auxdata *aux = (void *)CMSG_DATA(cmsg);
1033 checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
1038 r = dhcp_packet_verify_headers(packet, len, checksum);
1042 len -= DHCP_IP_UDP_SIZE;
1044 r = sd_event_get_now_monotonic(client->event, &time_now);
1046 return client_stop(client, r);
1048 return client_handle_message(client, &packet->dhcp, len, time_now);
1051 int sd_dhcp_client_start(sd_dhcp_client *client) {
1054 assert_return(client, -EINVAL);
1056 r = client_initialize(client);
1060 if (client->last_addr)
1061 client->state = DHCP_STATE_INIT_REBOOT;
1063 return client_start(client);
1066 int sd_dhcp_client_stop(sd_dhcp_client *client) {
1067 return client_stop(client, DHCP_EVENT_STOP);
1070 int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event,
1074 assert_return(client, -EINVAL);
1075 assert_return(!client->event, -EBUSY);
1078 client->event = sd_event_ref(event);
1080 r = sd_event_default(&client->event);
1085 client->event_priority = priority;
1090 int sd_dhcp_client_detach_event(sd_dhcp_client *client) {
1091 assert_return(client, -EINVAL);
1093 client->event = sd_event_unref(client->event);
1098 sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
1102 return client->event;
1105 void sd_dhcp_client_free(sd_dhcp_client *client) {
1109 sd_dhcp_client_stop(client);
1110 sd_dhcp_client_detach_event(client);
1112 free(client->req_opts);
1116 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free);
1117 #define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep)
1119 int sd_dhcp_client_new(sd_dhcp_client **ret) {
1120 _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
1122 assert_return(ret, -EINVAL);
1124 client = new0(sd_dhcp_client, 1);
1128 client->state = DHCP_STATE_INIT;
1131 client->attempt = 1;
1133 client->req_opts_size = ELEMENTSOF(default_req_opts);
1135 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1136 if (!client->req_opts)