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>
30 #include "dhcp-protocol.h"
31 #include "dhcp-internal.h"
32 #include "sd-dhcp-client.h"
34 #define DHCP_CLIENT_MIN_OPTIONS_SIZE 312
41 be32_t server_address;
47 typedef struct DHCPLease DHCPLease;
49 struct sd_dhcp_client {
52 sd_event_source *timeout_resend;
55 union sockaddr_union link;
56 sd_event_source *receive_message;
58 size_t req_opts_allocated;
61 struct ether_addr mac_addr;
66 sd_event_source *timeout_t1;
67 sd_event_source *timeout_t2;
68 sd_event_source *timeout_expire;
69 sd_dhcp_client_cb_t cb;
74 static const uint8_t default_req_opts[] = {
75 DHCP_OPTION_SUBNET_MASK,
77 DHCP_OPTION_HOST_NAME,
78 DHCP_OPTION_DOMAIN_NAME,
79 DHCP_OPTION_DOMAIN_NAME_SERVER,
80 DHCP_OPTION_NTP_SERVER,
83 static int client_receive_message(sd_event_source *s, int fd,
84 uint32_t revents, void *userdata);
86 int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
89 assert_return(client, -EINVAL);
92 client->userdata = userdata;
97 int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option)
101 assert_return(client, -EINVAL);
102 assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
105 case DHCP_OPTION_PAD:
106 case DHCP_OPTION_OVERLOAD:
107 case DHCP_OPTION_MESSAGE_TYPE:
108 case DHCP_OPTION_PARAMETER_REQUEST_LIST:
109 case DHCP_OPTION_END:
116 for (i = 0; i < client->req_opts_size; i++)
117 if (client->req_opts[i] == option)
120 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
121 client->req_opts_size + 1))
124 client->req_opts[client->req_opts_size++] = option;
129 int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
130 const struct in_addr *last_addr)
132 assert_return(client, -EINVAL);
133 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
136 client->last_addr = last_addr->s_addr;
138 client->last_addr = INADDR_ANY;
143 int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index)
145 assert_return(client, -EINVAL);
146 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
147 assert_return(interface_index >= -1, -EINVAL);
149 client->index = interface_index;
154 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
155 const struct ether_addr *addr)
157 assert_return(client, -EINVAL);
158 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
160 memcpy(&client->mac_addr, addr, ETH_ALEN);
165 int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr)
167 assert_return(client, -EINVAL);
168 assert_return(addr, -EINVAL);
170 switch (client->state) {
171 case DHCP_STATE_INIT:
172 case DHCP_STATE_SELECTING:
173 case DHCP_STATE_INIT_REBOOT:
174 case DHCP_STATE_REBOOTING:
175 case DHCP_STATE_REQUESTING:
176 return -EADDRNOTAVAIL;
178 case DHCP_STATE_BOUND:
179 case DHCP_STATE_RENEWING:
180 case DHCP_STATE_REBINDING:
181 addr->s_addr = client->lease->address;
189 int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
191 assert_return(client, -EINVAL);
192 assert_return(addr, -EINVAL);
194 switch (client->state) {
195 case DHCP_STATE_INIT:
196 case DHCP_STATE_SELECTING:
197 case DHCP_STATE_INIT_REBOOT:
198 case DHCP_STATE_REBOOTING:
199 case DHCP_STATE_REQUESTING:
200 return -EADDRNOTAVAIL;
202 case DHCP_STATE_BOUND:
203 case DHCP_STATE_RENEWING:
204 case DHCP_STATE_REBINDING:
205 addr->s_addr = client->lease->subnet_mask;
213 int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr ***addr)
215 assert_return(client, -EINVAL);
216 assert_return(addr, -EINVAL);
218 switch (client->state) {
219 case DHCP_STATE_INIT:
220 case DHCP_STATE_SELECTING:
221 case DHCP_STATE_INIT_REBOOT:
222 case DHCP_STATE_REBOOTING:
223 case DHCP_STATE_REQUESTING:
224 return -EADDRNOTAVAIL;
226 case DHCP_STATE_BOUND:
227 case DHCP_STATE_RENEWING:
228 case DHCP_STATE_REBINDING:
229 if (client->lease->dns)
230 *addr = client->lease->dns;
240 int sd_dhcp_client_prefixlen(const struct in_addr *addr)
245 assert_return(addr, -EADDRNOTAVAIL);
247 mask = be32toh(addr->s_addr);
256 int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr)
258 assert_return(client, -EINVAL);
259 assert_return(addr, -EINVAL);
261 switch (client->state) {
262 case DHCP_STATE_INIT:
263 case DHCP_STATE_SELECTING:
264 case DHCP_STATE_INIT_REBOOT:
265 case DHCP_STATE_REBOOTING:
266 case DHCP_STATE_REQUESTING:
267 return -EADDRNOTAVAIL;
269 case DHCP_STATE_BOUND:
270 case DHCP_STATE_RENEWING:
271 case DHCP_STATE_REBINDING:
272 addr->s_addr = client->lease->router;
280 static int client_notify(sd_dhcp_client *client, int event)
283 client->cb(client, event, client->userdata);
288 static void in_addrs_free(struct in_addr **addrs) {
294 for (i = 0; addrs[i]; i++)
300 static int client_stop(sd_dhcp_client *client, int error)
302 assert_return(client, -EINVAL);
304 client->receive_message =
305 sd_event_source_unref(client->receive_message);
311 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
313 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
314 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
315 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
319 client_notify(client, error);
321 switch (client->state) {
323 case DHCP_STATE_INIT:
324 case DHCP_STATE_SELECTING:
325 case DHCP_STATE_REQUESTING:
326 case DHCP_STATE_BOUND:
328 client->start_time = 0;
329 client->state = DHCP_STATE_INIT;
332 case DHCP_STATE_INIT_REBOOT:
333 case DHCP_STATE_REBOOTING:
334 case DHCP_STATE_RENEWING:
335 case DHCP_STATE_REBINDING:
341 in_addrs_free(client->lease->dns);
343 client->lease = NULL;
349 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
350 DHCPMessage *message, uint16_t secs,
351 uint8_t **opt, size_t *optlen)
356 *opt = (uint8_t *)(message + 1);
362 message->op = BOOTREQUEST;
364 message->hlen = ETHER_ADDR_LEN;
365 message->xid = htobe32(client->xid);
367 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
368 refuse to issue an DHCP lease if 'secs' is set to zero */
369 message->secs = htobe16(secs);
371 if (client->state == DHCP_STATE_RENEWING ||
372 client->state == DHCP_STATE_REBINDING)
373 message->ciaddr = client->lease->address;
375 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
383 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
388 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
389 Identifier option is not set */
390 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
391 ETH_ALEN, &client->mac_addr);
395 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
396 err = dhcp_option_append(opt, optlen,
397 DHCP_OPTION_PARAMETER_REQUEST_LIST,
398 client->req_opts_size,
403 /* Some DHCP servers will send bigger DHCP packets than the
404 defined default size unless the Maximum Messge Size option
405 is explicitely set */
406 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
407 DHCP_CLIENT_MIN_OPTIONS_SIZE);
408 err = dhcp_option_append(opt, optlen,
409 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
418 static uint16_t client_checksum(void *buf, int len)
428 for (i = 0; i < len / 2 ; i++)
437 sum = (sum & 0xffff) + (sum >> 16);
442 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len)
444 packet->ip.version = IPVERSION;
445 packet->ip.ihl = DHCP_IP_SIZE / 4;
446 packet->ip.tot_len = htobe16(len);
448 packet->ip.protocol = IPPROTO_UDP;
449 packet->ip.saddr = INADDR_ANY;
450 packet->ip.daddr = INADDR_BROADCAST;
452 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
453 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
454 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
456 packet->ip.check = packet->udp.len;
457 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
459 packet->ip.ttl = IPDEFTTL;
460 packet->ip.check = 0;
461 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
464 static int client_send_discover(sd_dhcp_client *client, uint16_t secs)
467 _cleanup_free_ DHCPPacket *discover;
471 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
472 len = sizeof(DHCPPacket) + optlen;
474 discover = malloc0(len);
479 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
480 secs, &opt, &optlen);
484 if (client->last_addr != INADDR_ANY) {
485 err = dhcp_option_append(&opt, &optlen,
486 DHCP_OPTION_REQUESTED_IP_ADDRESS,
487 4, &client->last_addr);
492 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
496 client_append_ip_headers(discover, len);
498 err = dhcp_network_send_raw_socket(client->fd, &client->link,
504 static int client_send_request(sd_dhcp_client *client, uint16_t secs)
506 _cleanup_free_ DHCPPacket *request;
511 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
512 len = DHCP_MESSAGE_SIZE + optlen;
514 request = malloc0(len);
518 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
523 if (client->state == DHCP_STATE_REQUESTING) {
524 err = dhcp_option_append(&opt, &optlen,
525 DHCP_OPTION_REQUESTED_IP_ADDRESS,
526 4, &client->lease->address);
530 err = dhcp_option_append(&opt, &optlen,
531 DHCP_OPTION_SERVER_IDENTIFIER,
532 4, &client->lease->server_address);
537 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
541 if (client->state == DHCP_STATE_RENEWING) {
542 err = dhcp_network_send_udp_socket(client->fd,
543 client->lease->server_address,
545 len - DHCP_IP_UDP_SIZE);
547 client_append_ip_headers(request, len);
549 err = dhcp_network_send_raw_socket(client->fd, &client->link,
556 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
559 sd_dhcp_client *client = userdata;
560 usec_t next_timeout = 0;
565 switch (client->state) {
566 case DHCP_STATE_RENEWING:
568 time_left = (client->lease->t2 - client->lease->t1)/2;
572 next_timeout = usec + time_left * USEC_PER_SEC;
576 case DHCP_STATE_REBINDING:
578 time_left = (client->lease->lifetime - client->lease->t2)/2;
582 next_timeout = usec + time_left * USEC_PER_SEC;
585 case DHCP_STATE_INIT:
586 case DHCP_STATE_INIT_REBOOT:
587 case DHCP_STATE_REBOOTING:
588 case DHCP_STATE_SELECTING:
589 case DHCP_STATE_REQUESTING:
590 case DHCP_STATE_BOUND:
592 if (client->attempt < 64)
593 client->attempt *= 2;
595 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
600 next_timeout += (random_u32() & 0x1fffff);
602 err = sd_event_add_monotonic(client->event, next_timeout,
604 client_timeout_resend, client,
605 &client->timeout_resend);
609 secs = (usec - client->start_time) / USEC_PER_SEC;
611 switch (client->state) {
612 case DHCP_STATE_INIT:
613 err = client_send_discover(client, secs);
615 client->state = DHCP_STATE_SELECTING;
618 if (client->attempt >= 64)
624 case DHCP_STATE_SELECTING:
625 err = client_send_discover(client, secs);
626 if (err < 0 && client->attempt >= 64)
631 case DHCP_STATE_REQUESTING:
632 case DHCP_STATE_RENEWING:
633 case DHCP_STATE_REBINDING:
634 err = client_send_request(client, secs);
635 if (err < 0 && client->attempt >= 64)
638 client->request_sent = usec;
642 case DHCP_STATE_INIT_REBOOT:
643 case DHCP_STATE_REBOOTING:
644 case DHCP_STATE_BOUND:
652 client_stop(client, err);
654 /* Errors were dealt with when stopping the client, don't spill
655 errors into the event loop handler */
659 static int client_initialize_events(sd_dhcp_client *client, usec_t usec)
663 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
664 client_receive_message, client,
665 &client->receive_message);
669 r = sd_event_add_monotonic(client->event, usec, 0,
670 client_timeout_resend, client,
671 &client->timeout_resend);
675 client_stop(client, r);
681 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
684 sd_dhcp_client *client = userdata;
686 client_stop(client, DHCP_EVENT_EXPIRED);
691 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
693 sd_dhcp_client *client = userdata;
696 if (client->fd >= 0) {
697 client->receive_message =
698 sd_event_source_unref(client->receive_message);
703 client->state = DHCP_STATE_REBINDING;
706 r = dhcp_network_bind_raw_socket(client->index, &client->link);
708 client_stop(client, r);
714 return client_initialize_events(client, usec);
717 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata)
719 sd_dhcp_client *client = userdata;
722 client->state = DHCP_STATE_RENEWING;
725 r = dhcp_network_bind_udp_socket(client->index,
726 client->lease->address);
728 client_stop(client, r);
734 return client_initialize_events(client, usec);
737 static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
740 DHCPLease *lease = user_data;
745 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
747 memcpy(&val, option, 4);
748 lease->lifetime = be32toh(val);
753 case DHCP_OPTION_SERVER_IDENTIFIER:
755 memcpy(&lease->server_address, option, 4);
759 case DHCP_OPTION_SUBNET_MASK:
761 memcpy(&lease->subnet_mask, option, 4);
765 case DHCP_OPTION_ROUTER:
767 memcpy(&lease->router, option, 4);
771 case DHCP_OPTION_DOMAIN_NAME_SERVER:
775 in_addrs_free(lease->dns);
777 lease->dns = new0(struct in_addr*, len / 4 + 1);
781 for (i = 0; i < len / 4; i++) {
782 lease->dns[i] = new0(struct in_addr, 1);
783 memcpy(&lease->dns[i]->s_addr, option + 4 * i, 4);
786 lease->dns[i + 1] = NULL;
791 case DHCP_OPTION_RENEWAL_T1_TIME:
793 memcpy(&val, option, 4);
794 lease->t1 = be32toh(val);
799 case DHCP_OPTION_REBINDING_T2_TIME:
801 memcpy(&val, option, 4);
802 lease->t2 = be32toh(val);
811 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
816 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
819 hdrlen = message->ip.ihl * 4;
820 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
824 message->ip.check = message->udp.len;
827 if (hdrlen + be16toh(message->udp.len) > len ||
828 client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
831 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
832 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
835 if (message->dhcp.op != BOOTREPLY)
838 if (be32toh(message->dhcp.xid) != client->xid)
841 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
848 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
854 err = client_verify_headers(client, offer, len);
858 lease = new0(DHCPLease, 1);
862 len = len - DHCP_IP_UDP_SIZE;
863 if (dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
864 lease) != DHCP_OFFER)
867 lease->address = offer->dhcp.yiaddr;
869 if (lease->address == INADDR_ANY ||
870 lease->server_address == INADDR_ANY ||
871 lease->subnet_mask == INADDR_ANY ||
872 lease->lifetime == 0)
875 client->lease = lease;
885 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
893 if (client->state == DHCP_STATE_RENEWING) {
894 dhcp = (DHCPMessage *)buf;
896 ack = (DHCPPacket *)buf;
898 r = client_verify_headers(client, ack, len);
903 len -= DHCP_IP_UDP_SIZE;
906 lease = new0(DHCPLease, 1);
910 r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
913 r = DHCP_EVENT_NO_LEASE;
922 lease->address = dhcp->yiaddr;
924 if (lease->address == INADDR_ANY ||
925 lease->server_address == INADDR_ANY ||
926 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0) {
931 r = DHCP_EVENT_IP_ACQUIRE;
933 if (client->lease->address != lease->address ||
934 client->lease->subnet_mask != lease->subnet_mask ||
935 client->lease->router != lease->router) {
936 r = DHCP_EVENT_IP_CHANGE;
942 client->lease = lease;
952 static uint64_t client_compute_timeout(uint64_t request_sent,
955 return request_sent + (lifetime - 3) * USEC_PER_SEC +
956 + (random_u32() & 0x1fffff);
959 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec)
962 uint64_t next_timeout;
964 if (client->lease->lifetime < 10)
967 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
968 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
969 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
971 if (!client->lease->t1)
972 client->lease->t1 = client->lease->lifetime / 2;
974 next_timeout = client_compute_timeout(client->request_sent,
976 if (next_timeout < usec)
979 err = sd_event_add_monotonic(client->event, next_timeout,
981 client_timeout_t1, client,
982 &client->timeout_t1);
986 if (!client->lease->t2)
987 client->lease->t2 = client->lease->lifetime * 7 / 8;
989 if (client->lease->t2 < client->lease->t1)
992 if (client->lease->lifetime < client->lease->t2)
995 next_timeout = client_compute_timeout(client->request_sent,
997 if (next_timeout < usec)
1000 err = sd_event_add_monotonic(client->event, next_timeout,
1002 client_timeout_t2, client,
1003 &client->timeout_t2);
1007 next_timeout = client_compute_timeout(client->request_sent,
1008 client->lease->lifetime);
1009 if (next_timeout < usec)
1012 err = sd_event_add_monotonic(client->event, next_timeout,
1014 client_timeout_expire, client,
1015 &client->timeout_expire);
1022 static int client_receive_message(sd_event_source *s, int fd,
1023 uint32_t revents, void *userdata)
1025 sd_dhcp_client *client = userdata;
1026 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1027 int buflen = sizeof(buf);
1028 int len, r = 0, notify_event = 0;
1029 DHCPPacket *message;
1032 len = read(fd, &buf, buflen);
1036 r = sd_event_get_now_monotonic(client->event, &time_now);
1040 switch (client->state) {
1041 case DHCP_STATE_SELECTING:
1043 message = (DHCPPacket *)&buf;
1045 if (client_receive_offer(client, message, len) >= 0) {
1047 client->timeout_resend =
1048 sd_event_source_unref(client->timeout_resend);
1050 client->state = DHCP_STATE_REQUESTING;
1051 client->attempt = 1;
1053 r = sd_event_add_monotonic(client->event, time_now, 0,
1054 client_timeout_resend,
1056 &client->timeout_resend);
1063 case DHCP_STATE_REQUESTING:
1064 case DHCP_STATE_RENEWING:
1065 case DHCP_STATE_REBINDING:
1067 r = client_receive_ack(client, buf, len);
1069 if (r == DHCP_EVENT_NO_LEASE)
1073 client->timeout_resend =
1074 sd_event_source_unref(client->timeout_resend);
1076 if (client->state == DHCP_STATE_REQUESTING)
1077 notify_event = DHCP_EVENT_IP_ACQUIRE;
1078 else if (r != DHCP_EVENT_IP_ACQUIRE)
1081 client->state = DHCP_STATE_BOUND;
1082 client->attempt = 1;
1084 client->last_addr = client->lease->address;
1086 r = client_set_lease_timeouts(client, time_now);
1091 client_notify(client, notify_event);
1093 client->receive_message =
1094 sd_event_source_unref(client->receive_message);
1103 case DHCP_STATE_INIT:
1104 case DHCP_STATE_INIT_REBOOT:
1105 case DHCP_STATE_REBOOTING:
1106 case DHCP_STATE_BOUND:
1112 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1113 return client_stop(client, r);
1118 int sd_dhcp_client_start(sd_dhcp_client *client)
1122 assert_return(client, -EINVAL);
1123 assert_return(client->index > 0, -EINVAL);
1124 assert_return(client->state == DHCP_STATE_INIT ||
1125 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1127 client->xid = random_u32();
1129 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1132 client_stop(client, r);
1137 client->start_time = now(CLOCK_MONOTONIC);
1139 return client_initialize_events(client, client->start_time);
1142 int sd_dhcp_client_stop(sd_dhcp_client *client)
1144 return client_stop(client, DHCP_EVENT_STOP);
1147 sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client)
1149 assert_return(client, NULL);
1151 sd_dhcp_client_stop(client);
1153 sd_event_unref(client->event);
1154 free(client->req_opts);
1160 sd_dhcp_client *sd_dhcp_client_new(sd_event *event)
1162 sd_dhcp_client *client;
1164 assert_return(event, NULL);
1166 client = new0(sd_dhcp_client, 1);
1170 client->event = sd_event_ref(event);
1171 client->state = DHCP_STATE_INIT;
1174 client->attempt = 1;
1176 client->req_opts_size = ELEMENTSOF(default_req_opts);
1178 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1179 if (!client->req_opts) {