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->s_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 int client_stop(sd_dhcp_client *client, int error)
290 assert_return(client, -EINVAL);
292 client->receive_message =
293 sd_event_source_unref(client->receive_message);
299 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
301 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
302 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
303 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
307 client_notify(client, error);
309 switch (client->state) {
311 case DHCP_STATE_INIT:
312 case DHCP_STATE_SELECTING:
313 case DHCP_STATE_REQUESTING:
314 case DHCP_STATE_BOUND:
316 client->start_time = 0;
317 client->state = DHCP_STATE_INIT;
320 case DHCP_STATE_INIT_REBOOT:
321 case DHCP_STATE_REBOOTING:
322 case DHCP_STATE_RENEWING:
323 case DHCP_STATE_REBINDING:
330 client->lease = NULL;
336 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
337 DHCPMessage *message, uint16_t secs,
338 uint8_t **opt, size_t *optlen)
343 *opt = (uint8_t *)(message + 1);
349 message->op = BOOTREQUEST;
351 message->hlen = ETHER_ADDR_LEN;
352 message->xid = htobe32(client->xid);
354 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
355 refuse to issue an DHCP lease if 'secs' is set to zero */
356 message->secs = htobe16(secs);
358 if (client->state == DHCP_STATE_RENEWING ||
359 client->state == DHCP_STATE_REBINDING)
360 message->ciaddr = client->lease->address;
362 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
370 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
375 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
376 Identifier option is not set */
377 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
378 ETH_ALEN, &client->mac_addr);
382 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
383 err = dhcp_option_append(opt, optlen,
384 DHCP_OPTION_PARAMETER_REQUEST_LIST,
385 client->req_opts_size,
390 /* Some DHCP servers will send bigger DHCP packets than the
391 defined default size unless the Maximum Messge Size option
392 is explicitely set */
393 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
394 DHCP_CLIENT_MIN_OPTIONS_SIZE);
395 err = dhcp_option_append(opt, optlen,
396 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
405 static uint16_t client_checksum(void *buf, int len)
415 for (i = 0; i < len / 2 ; i++)
424 sum = (sum & 0xffff) + (sum >> 16);
429 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len)
431 packet->ip.version = IPVERSION;
432 packet->ip.ihl = DHCP_IP_SIZE / 4;
433 packet->ip.tot_len = htobe16(len);
435 packet->ip.protocol = IPPROTO_UDP;
436 packet->ip.saddr = INADDR_ANY;
437 packet->ip.daddr = INADDR_BROADCAST;
439 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
440 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
441 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
443 packet->ip.check = packet->udp.len;
444 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
446 packet->ip.ttl = IPDEFTTL;
447 packet->ip.check = 0;
448 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
451 static int client_send_discover(sd_dhcp_client *client, uint16_t secs)
454 _cleanup_free_ DHCPPacket *discover;
458 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
459 len = sizeof(DHCPPacket) + optlen;
461 discover = malloc0(len);
466 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
467 secs, &opt, &optlen);
471 if (client->last_addr != INADDR_ANY) {
472 err = dhcp_option_append(&opt, &optlen,
473 DHCP_OPTION_REQUESTED_IP_ADDRESS,
474 4, &client->last_addr);
479 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
483 client_append_ip_headers(discover, len);
485 err = dhcp_network_send_raw_socket(client->fd, &client->link,
491 static int client_send_request(sd_dhcp_client *client, uint16_t secs)
493 _cleanup_free_ DHCPPacket *request;
498 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
499 len = DHCP_MESSAGE_SIZE + optlen;
501 request = malloc0(len);
505 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
510 if (client->state == DHCP_STATE_REQUESTING) {
511 err = dhcp_option_append(&opt, &optlen,
512 DHCP_OPTION_REQUESTED_IP_ADDRESS,
513 4, &client->lease->address);
517 err = dhcp_option_append(&opt, &optlen,
518 DHCP_OPTION_SERVER_IDENTIFIER,
519 4, &client->lease->server_address);
524 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
528 if (client->state == DHCP_STATE_RENEWING) {
529 err = dhcp_network_send_udp_socket(client->fd,
530 client->lease->server_address,
532 len - DHCP_IP_UDP_SIZE);
534 client_append_ip_headers(request, len);
536 err = dhcp_network_send_raw_socket(client->fd, &client->link,
543 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
546 sd_dhcp_client *client = userdata;
547 usec_t next_timeout = 0;
552 switch (client->state) {
553 case DHCP_STATE_RENEWING:
555 time_left = (client->lease->t2 - client->lease->t1)/2;
559 next_timeout = usec + time_left * USEC_PER_SEC;
563 case DHCP_STATE_REBINDING:
565 time_left = (client->lease->lifetime - client->lease->t2)/2;
569 next_timeout = usec + time_left * USEC_PER_SEC;
572 case DHCP_STATE_INIT:
573 case DHCP_STATE_INIT_REBOOT:
574 case DHCP_STATE_REBOOTING:
575 case DHCP_STATE_SELECTING:
576 case DHCP_STATE_REQUESTING:
577 case DHCP_STATE_BOUND:
579 if (client->attempt < 64)
580 client->attempt *= 2;
582 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
587 next_timeout += (random_u32() & 0x1fffff);
589 err = sd_event_add_monotonic(client->event, next_timeout,
591 client_timeout_resend, client,
592 &client->timeout_resend);
596 secs = (usec - client->start_time) / USEC_PER_SEC;
598 switch (client->state) {
599 case DHCP_STATE_INIT:
600 err = client_send_discover(client, secs);
602 client->state = DHCP_STATE_SELECTING;
605 if (client->attempt >= 64)
611 case DHCP_STATE_SELECTING:
612 err = client_send_discover(client, secs);
613 if (err < 0 && client->attempt >= 64)
618 case DHCP_STATE_REQUESTING:
619 case DHCP_STATE_RENEWING:
620 case DHCP_STATE_REBINDING:
621 err = client_send_request(client, secs);
622 if (err < 0 && client->attempt >= 64)
625 client->request_sent = usec;
629 case DHCP_STATE_INIT_REBOOT:
630 case DHCP_STATE_REBOOTING:
631 case DHCP_STATE_BOUND:
639 client_stop(client, err);
641 /* Errors were dealt with when stopping the client, don't spill
642 errors into the event loop handler */
646 static int client_initialize_events(sd_dhcp_client *client, usec_t usec)
650 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
651 client_receive_message, client,
652 &client->receive_message);
656 r = sd_event_add_monotonic(client->event, usec, 0,
657 client_timeout_resend, client,
658 &client->timeout_resend);
662 client_stop(client, r);
668 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
671 sd_dhcp_client *client = userdata;
673 client_stop(client, DHCP_EVENT_EXPIRED);
678 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
680 sd_dhcp_client *client = userdata;
683 if (client->fd >= 0) {
684 client->receive_message =
685 sd_event_source_unref(client->receive_message);
690 client->state = DHCP_STATE_REBINDING;
693 r = dhcp_network_bind_raw_socket(client->index, &client->link);
695 client_stop(client, r);
701 return client_initialize_events(client, usec);
704 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata)
706 sd_dhcp_client *client = userdata;
709 client->state = DHCP_STATE_RENEWING;
712 r = dhcp_network_bind_udp_socket(client->index,
713 client->lease->address);
715 client_stop(client, r);
721 return client_initialize_events(client, usec);
724 static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
727 DHCPLease *lease = user_data;
732 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
734 memcpy(&val, option, 4);
735 lease->lifetime = be32toh(val);
740 case DHCP_OPTION_SERVER_IDENTIFIER:
742 memcpy(&lease->server_address, option, 4);
746 case DHCP_OPTION_SUBNET_MASK:
748 memcpy(&lease->subnet_mask, option, 4);
752 case DHCP_OPTION_ROUTER:
754 memcpy(&lease->router, option, 4);
758 case DHCP_OPTION_DOMAIN_NAME_SERVER:
760 memcpy(&lease->dns, option, 4);
764 case DHCP_OPTION_RENEWAL_T1_TIME:
766 memcpy(&val, option, 4);
767 lease->t1 = be32toh(val);
772 case DHCP_OPTION_REBINDING_T2_TIME:
774 memcpy(&val, option, 4);
775 lease->t2 = be32toh(val);
784 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
789 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
792 hdrlen = message->ip.ihl * 4;
793 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
797 message->ip.check = message->udp.len;
800 if (hdrlen + be16toh(message->udp.len) > len ||
801 client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
804 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
805 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
808 if (message->dhcp.op != BOOTREPLY)
811 if (be32toh(message->dhcp.xid) != client->xid)
814 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
821 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
827 err = client_verify_headers(client, offer, len);
831 lease = new0(DHCPLease, 1);
835 len = len - DHCP_IP_UDP_SIZE;
836 if (dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
837 lease) != DHCP_OFFER)
840 lease->address = offer->dhcp.yiaddr;
842 if (lease->address == INADDR_ANY ||
843 lease->server_address == INADDR_ANY ||
844 lease->subnet_mask == INADDR_ANY ||
845 lease->lifetime == 0)
848 client->lease = lease;
858 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
866 if (client->state == DHCP_STATE_RENEWING) {
867 dhcp = (DHCPMessage *)buf;
869 ack = (DHCPPacket *)buf;
871 r = client_verify_headers(client, ack, len);
876 len -= DHCP_IP_UDP_SIZE;
879 lease = new0(DHCPLease, 1);
883 r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
886 r = DHCP_EVENT_NO_LEASE;
895 lease->address = dhcp->yiaddr;
897 if (lease->address == INADDR_ANY ||
898 lease->server_address == INADDR_ANY ||
899 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0) {
904 r = DHCP_EVENT_IP_ACQUIRE;
906 if (client->lease->address != lease->address ||
907 client->lease->subnet_mask != lease->subnet_mask ||
908 client->lease->router != lease->router) {
909 r = DHCP_EVENT_IP_CHANGE;
915 client->lease = lease;
925 static uint64_t client_compute_timeout(uint64_t request_sent,
928 return request_sent + (lifetime - 3) * USEC_PER_SEC +
929 + (random_u32() & 0x1fffff);
932 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec)
935 uint64_t next_timeout;
937 if (client->lease->lifetime < 10)
940 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
941 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
942 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
944 if (!client->lease->t1)
945 client->lease->t1 = client->lease->lifetime / 2;
947 next_timeout = client_compute_timeout(client->request_sent,
949 if (next_timeout < usec)
952 err = sd_event_add_monotonic(client->event, next_timeout,
954 client_timeout_t1, client,
955 &client->timeout_t1);
959 if (!client->lease->t2)
960 client->lease->t2 = client->lease->lifetime * 7 / 8;
962 if (client->lease->t2 < client->lease->t1)
965 if (client->lease->lifetime < client->lease->t2)
968 next_timeout = client_compute_timeout(client->request_sent,
970 if (next_timeout < usec)
973 err = sd_event_add_monotonic(client->event, next_timeout,
975 client_timeout_t2, client,
976 &client->timeout_t2);
980 next_timeout = client_compute_timeout(client->request_sent,
981 client->lease->lifetime);
982 if (next_timeout < usec)
985 err = sd_event_add_monotonic(client->event, next_timeout,
987 client_timeout_expire, client,
988 &client->timeout_expire);
995 static int client_receive_message(sd_event_source *s, int fd,
996 uint32_t revents, void *userdata)
998 sd_dhcp_client *client = userdata;
999 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1000 int buflen = sizeof(buf);
1001 int len, r = 0, notify_event = 0;
1002 DHCPPacket *message;
1005 len = read(fd, &buf, buflen);
1009 r = sd_event_get_now_monotonic(client->event, &time_now);
1013 switch (client->state) {
1014 case DHCP_STATE_SELECTING:
1016 message = (DHCPPacket *)&buf;
1018 if (client_receive_offer(client, message, len) >= 0) {
1020 client->timeout_resend =
1021 sd_event_source_unref(client->timeout_resend);
1023 client->state = DHCP_STATE_REQUESTING;
1024 client->attempt = 1;
1026 r = sd_event_add_monotonic(client->event, time_now, 0,
1027 client_timeout_resend,
1029 &client->timeout_resend);
1036 case DHCP_STATE_REQUESTING:
1037 case DHCP_STATE_RENEWING:
1038 case DHCP_STATE_REBINDING:
1040 r = client_receive_ack(client, buf, len);
1042 if (r == DHCP_EVENT_NO_LEASE)
1046 client->timeout_resend =
1047 sd_event_source_unref(client->timeout_resend);
1049 if (client->state == DHCP_STATE_REQUESTING)
1050 notify_event = DHCP_EVENT_IP_ACQUIRE;
1051 else if (r != DHCP_EVENT_IP_ACQUIRE)
1054 client->state = DHCP_STATE_BOUND;
1055 client->attempt = 1;
1057 client->last_addr = client->lease->address;
1059 r = client_set_lease_timeouts(client, time_now);
1064 client_notify(client, notify_event);
1066 client->receive_message =
1067 sd_event_source_unref(client->receive_message);
1076 case DHCP_STATE_INIT:
1077 case DHCP_STATE_INIT_REBOOT:
1078 case DHCP_STATE_REBOOTING:
1079 case DHCP_STATE_BOUND:
1085 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1086 return client_stop(client, r);
1091 int sd_dhcp_client_start(sd_dhcp_client *client)
1095 assert_return(client, -EINVAL);
1096 assert_return(client->index > 0, -EINVAL);
1097 assert_return(client->state == DHCP_STATE_INIT ||
1098 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1100 client->xid = random_u32();
1102 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1105 client_stop(client, r);
1110 client->start_time = now(CLOCK_MONOTONIC);
1112 return client_initialize_events(client, client->start_time);
1115 int sd_dhcp_client_stop(sd_dhcp_client *client)
1117 return client_stop(client, DHCP_EVENT_STOP);
1120 sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client)
1122 assert_return(client, NULL);
1124 sd_dhcp_client_stop(client);
1126 sd_event_unref(client->event);
1127 free(client->req_opts);
1133 sd_dhcp_client *sd_dhcp_client_new(sd_event *event)
1135 sd_dhcp_client *client;
1137 assert_return(event, NULL);
1139 client = new0(sd_dhcp_client, 1);
1143 client->event = sd_event_ref(event);
1144 client->state = DHCP_STATE_INIT;
1147 client->attempt = 1;
1149 client->req_opts_size = ELEMENTSOF(default_req_opts);
1151 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1152 if (!client->req_opts) {