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
36 #define client_state_machine_check(s, r) \
38 if (s != DHCP_STATE_BOUND && \
39 s != DHCP_STATE_RENEWING && \
40 s != DHCP_STATE_REBINDING) { \
50 be32_t server_address;
60 typedef struct DHCPLease DHCPLease;
62 struct sd_dhcp_client {
66 sd_event_source *timeout_resend;
69 union sockaddr_union link;
70 sd_event_source *receive_message;
72 size_t req_opts_allocated;
75 struct ether_addr mac_addr;
80 sd_event_source *timeout_t1;
81 sd_event_source *timeout_t2;
82 sd_event_source *timeout_expire;
83 sd_dhcp_client_cb_t cb;
88 static const uint8_t default_req_opts[] = {
89 DHCP_OPTION_SUBNET_MASK,
91 DHCP_OPTION_HOST_NAME,
92 DHCP_OPTION_DOMAIN_NAME,
93 DHCP_OPTION_DOMAIN_NAME_SERVER,
94 DHCP_OPTION_NTP_SERVER,
97 static int client_receive_message(sd_event_source *s, int fd,
98 uint32_t revents, void *userdata);
100 int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
102 assert_return(client, -EINVAL);
105 client->userdata = userdata;
110 int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
113 assert_return(client, -EINVAL);
114 assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
117 case DHCP_OPTION_PAD:
118 case DHCP_OPTION_OVERLOAD:
119 case DHCP_OPTION_MESSAGE_TYPE:
120 case DHCP_OPTION_PARAMETER_REQUEST_LIST:
121 case DHCP_OPTION_END:
128 for (i = 0; i < client->req_opts_size; i++)
129 if (client->req_opts[i] == option)
132 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
133 client->req_opts_size + 1))
136 client->req_opts[client->req_opts_size++] = option;
141 int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
142 const struct in_addr *last_addr) {
143 assert_return(client, -EINVAL);
144 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
147 client->last_addr = last_addr->s_addr;
149 client->last_addr = INADDR_ANY;
154 int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) {
155 assert_return(client, -EINVAL);
156 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
157 assert_return(interface_index >= -1, -EINVAL);
159 client->index = interface_index;
164 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
165 const struct ether_addr *addr) {
166 assert_return(client, -EINVAL);
167 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
169 memcpy(&client->mac_addr, addr, ETH_ALEN);
174 int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr) {
175 assert_return(client, -EINVAL);
176 assert_return(addr, -EINVAL);
178 client_state_machine_check (client->state, -EADDRNOTAVAIL);
180 addr->s_addr = client->lease->address;
185 int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu) {
186 assert_return(client, -EINVAL);
187 assert_return(mtu, -EINVAL);
189 client_state_machine_check (client->state, -EADDRNOTAVAIL);
191 if (client->lease->mtu)
192 *mtu = client->lease->mtu;
199 int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr **addr, size_t *addr_size) {
200 assert_return(client, -EINVAL);
201 assert_return(addr, -EINVAL);
202 assert_return(addr_size, -EINVAL);
204 client_state_machine_check (client->state, -EADDRNOTAVAIL);
206 if (client->lease->dns_size) {
207 *addr_size = client->lease->dns_size;
208 *addr = client->lease->dns;
215 int sd_dhcp_client_get_domainname(sd_dhcp_client *client, const char **domainname) {
216 assert_return(client, -EINVAL);
217 assert_return(domainname, -EINVAL);
219 client_state_machine_check (client->state, -EADDRNOTAVAIL);
221 if (client->lease->domainname)
222 *domainname = client->lease->domainname;
229 int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname) {
230 assert_return(client, -EINVAL);
231 assert_return(hostname, -EINVAL);
233 client_state_machine_check (client->state, -EADDRNOTAVAIL);
235 if (client->lease->hostname)
236 *hostname = client->lease->hostname;
243 int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr) {
244 assert_return(client, -EINVAL);
245 assert_return(addr, -EINVAL);
247 client_state_machine_check (client->state, -EADDRNOTAVAIL);
249 addr->s_addr = client->lease->router;
254 int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr) {
255 assert_return(client, -EINVAL);
256 assert_return(addr, -EINVAL);
258 client_state_machine_check (client->state, -EADDRNOTAVAIL);
260 addr->s_addr = client->lease->subnet_mask;
265 static int client_notify(sd_dhcp_client *client, int event) {
267 client->cb(client, event, client->userdata);
272 static void lease_free(DHCPLease *lease) {
276 free(lease->hostname);
277 free(lease->domainname);
282 DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPLease*, lease_free);
283 #define _cleanup_lease_free_ _cleanup_(lease_freep)
285 static int client_stop(sd_dhcp_client *client, int error) {
286 assert_return(client, -EINVAL);
288 client->receive_message =
289 sd_event_source_unref(client->receive_message);
295 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
297 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
298 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
299 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
303 client_notify(client, error);
305 client->start_time = 0;
306 client->state = DHCP_STATE_INIT;
309 lease_free(client->lease);
310 client->lease = NULL;
316 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
317 DHCPMessage *message, uint16_t secs,
318 uint8_t **opt, size_t *optlen) {
322 *opt = (uint8_t *)(message + 1);
328 message->op = BOOTREQUEST;
330 message->hlen = ETHER_ADDR_LEN;
331 message->xid = htobe32(client->xid);
333 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
334 refuse to issue an DHCP lease if 'secs' is set to zero */
335 message->secs = htobe16(secs);
337 if (client->state == DHCP_STATE_RENEWING ||
338 client->state == DHCP_STATE_REBINDING)
339 message->ciaddr = client->lease->address;
341 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
349 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
354 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
355 Identifier option is not set */
356 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
357 ETH_ALEN, &client->mac_addr);
361 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
362 err = dhcp_option_append(opt, optlen,
363 DHCP_OPTION_PARAMETER_REQUEST_LIST,
364 client->req_opts_size,
369 /* Some DHCP servers will send bigger DHCP packets than the
370 defined default size unless the Maximum Messge Size option
371 is explicitely set */
372 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
373 DHCP_CLIENT_MIN_OPTIONS_SIZE);
374 err = dhcp_option_append(opt, optlen,
375 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
384 static uint16_t client_checksum(void *buf, int len) {
393 for (i = 0; i < len / 2 ; i++)
402 sum = (sum & 0xffff) + (sum >> 16);
407 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len) {
408 packet->ip.version = IPVERSION;
409 packet->ip.ihl = DHCP_IP_SIZE / 4;
410 packet->ip.tot_len = htobe16(len);
412 packet->ip.protocol = IPPROTO_UDP;
413 packet->ip.saddr = INADDR_ANY;
414 packet->ip.daddr = INADDR_BROADCAST;
416 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
417 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
418 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
420 packet->ip.check = packet->udp.len;
421 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
423 packet->ip.ttl = IPDEFTTL;
424 packet->ip.check = 0;
425 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
428 static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
430 _cleanup_free_ DHCPPacket *discover;
434 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
435 len = sizeof(DHCPPacket) + optlen;
437 discover = malloc0(len);
442 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
443 secs, &opt, &optlen);
447 if (client->last_addr != INADDR_ANY) {
448 err = dhcp_option_append(&opt, &optlen,
449 DHCP_OPTION_REQUESTED_IP_ADDRESS,
450 4, &client->last_addr);
455 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
459 client_append_ip_headers(discover, len);
461 err = dhcp_network_send_raw_socket(client->fd, &client->link,
467 static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
468 _cleanup_free_ DHCPPacket *request;
473 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
474 len = DHCP_MESSAGE_SIZE + optlen;
476 request = malloc0(len);
480 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
485 if (client->state == DHCP_STATE_REQUESTING) {
486 err = dhcp_option_append(&opt, &optlen,
487 DHCP_OPTION_REQUESTED_IP_ADDRESS,
488 4, &client->lease->address);
492 err = dhcp_option_append(&opt, &optlen,
493 DHCP_OPTION_SERVER_IDENTIFIER,
494 4, &client->lease->server_address);
499 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
503 if (client->state == DHCP_STATE_RENEWING) {
504 err = dhcp_network_send_udp_socket(client->fd,
505 client->lease->server_address,
507 len - DHCP_IP_UDP_SIZE);
509 client_append_ip_headers(request, len);
511 err = dhcp_network_send_raw_socket(client->fd, &client->link,
518 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
520 sd_dhcp_client *client = userdata;
521 usec_t next_timeout = 0;
528 assert(client->event);
530 switch (client->state) {
531 case DHCP_STATE_RENEWING:
533 time_left = (client->lease->t2 - client->lease->t1)/2;
537 next_timeout = usec + time_left * USEC_PER_SEC;
541 case DHCP_STATE_REBINDING:
543 time_left = (client->lease->lifetime - client->lease->t2)/2;
547 next_timeout = usec + time_left * USEC_PER_SEC;
550 case DHCP_STATE_INIT:
551 case DHCP_STATE_INIT_REBOOT:
552 case DHCP_STATE_REBOOTING:
553 case DHCP_STATE_SELECTING:
554 case DHCP_STATE_REQUESTING:
555 case DHCP_STATE_BOUND:
557 if (client->attempt < 64)
558 client->attempt *= 2;
560 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
565 next_timeout += (random_u32() & 0x1fffff);
567 r = sd_event_add_monotonic(client->event, next_timeout,
569 client_timeout_resend, client,
570 &client->timeout_resend);
574 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
578 secs = (usec - client->start_time) / USEC_PER_SEC;
580 switch (client->state) {
581 case DHCP_STATE_INIT:
582 r = client_send_discover(client, secs);
584 client->state = DHCP_STATE_SELECTING;
587 if (client->attempt >= 64)
593 case DHCP_STATE_SELECTING:
594 r = client_send_discover(client, secs);
595 if (r < 0 && client->attempt >= 64)
600 case DHCP_STATE_REQUESTING:
601 case DHCP_STATE_RENEWING:
602 case DHCP_STATE_REBINDING:
603 r = client_send_request(client, secs);
604 if (r < 0 && client->attempt >= 64)
607 client->request_sent = usec;
611 case DHCP_STATE_INIT_REBOOT:
612 case DHCP_STATE_REBOOTING:
613 case DHCP_STATE_BOUND:
621 client_stop(client, r);
623 /* Errors were dealt with when stopping the client, don't spill
624 errors into the event loop handler */
628 static int client_initialize_events(sd_dhcp_client *client, usec_t usec) {
632 assert(client->event);
634 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
635 client_receive_message, client,
636 &client->receive_message);
640 r = sd_event_source_set_priority(client->receive_message, client->event_priority);
644 r = sd_event_add_monotonic(client->event, usec, 0,
645 client_timeout_resend, client,
646 &client->timeout_resend);
650 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
654 client_stop(client, r);
660 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
662 sd_dhcp_client *client = userdata;
664 client_stop(client, DHCP_EVENT_EXPIRED);
669 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
670 sd_dhcp_client *client = userdata;
673 if (client->fd >= 0) {
674 client->receive_message =
675 sd_event_source_unref(client->receive_message);
680 client->state = DHCP_STATE_REBINDING;
683 r = dhcp_network_bind_raw_socket(client->index, &client->link);
685 client_stop(client, r);
691 return client_initialize_events(client, usec);
694 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
695 sd_dhcp_client *client = userdata;
698 client->state = DHCP_STATE_RENEWING;
701 r = dhcp_network_bind_udp_socket(client->index,
702 client->lease->address);
704 client_stop(client, r);
710 return client_initialize_events(client, usec);
713 static int client_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
715 DHCPLease *lease = user_data;
720 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
722 memcpy(&val, option, 4);
723 lease->lifetime = be32toh(val);
728 case DHCP_OPTION_SERVER_IDENTIFIER:
730 memcpy(&lease->server_address, option, 4);
734 case DHCP_OPTION_SUBNET_MASK:
736 memcpy(&lease->subnet_mask, option, 4);
740 case DHCP_OPTION_ROUTER:
742 memcpy(&lease->router, option, 4);
746 case DHCP_OPTION_DOMAIN_NAME_SERVER:
747 if (len && !(len % 4)) {
750 lease->dns_size = len / 4;
753 lease->dns = new0(struct in_addr, lease->dns_size);
757 for (i = 0; i < lease->dns_size; i++) {
758 memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
764 case DHCP_OPTION_INTERFACE_MTU:
768 memcpy(&mtu, option, 2);
769 lease->mtu = be16toh(mtu);
777 case DHCP_OPTION_DOMAIN_NAME:
779 free(lease->domainname);
780 lease->domainname = strndup((const char *)option, len);
785 case DHCP_OPTION_HOST_NAME:
787 free(lease->hostname);
788 lease->hostname = strndup((const char *)option, len);
793 case DHCP_OPTION_RENEWAL_T1_TIME:
795 memcpy(&val, option, 4);
796 lease->t1 = be32toh(val);
801 case DHCP_OPTION_REBINDING_T2_TIME:
803 memcpy(&val, option, 4);
804 lease->t2 = be32toh(val);
813 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
817 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
820 hdrlen = message->ip.ihl * 4;
821 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
825 if (hdrlen + be16toh(message->udp.len) > len)
828 if (message->udp.check) {
829 message->ip.check = message->udp.len;
832 if (client_checksum(&message->ip.ttl,
833 be16toh(message->udp.len) + 12))
837 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
838 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
841 if (message->dhcp.op != BOOTREPLY)
844 if (be32toh(message->dhcp.xid) != client->xid)
847 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
854 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
856 _cleanup_lease_free_ DHCPLease *lease = NULL;
859 r = client_verify_headers(client, offer, len);
863 lease = new0(DHCPLease, 1);
867 len = len - DHCP_IP_UDP_SIZE;
868 r = dhcp_option_parse(&offer->dhcp, len, client_parse_options,
873 lease->address = offer->dhcp.yiaddr;
875 if (lease->address == INADDR_ANY ||
876 lease->server_address == INADDR_ANY ||
877 lease->subnet_mask == INADDR_ANY ||
878 lease->lifetime == 0)
881 client->lease = lease;
887 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
891 _cleanup_lease_free_ DHCPLease *lease = NULL;
894 if (client->state == DHCP_STATE_RENEWING) {
895 dhcp = (DHCPMessage *)buf;
897 ack = (DHCPPacket *)buf;
899 r = client_verify_headers(client, ack, len);
904 len -= DHCP_IP_UDP_SIZE;
907 lease = new0(DHCPLease, 1);
911 r = dhcp_option_parse(dhcp, len, client_parse_options, lease);
913 return DHCP_EVENT_NO_LEASE;
918 lease->address = dhcp->yiaddr;
920 if (lease->address == INADDR_ANY ||
921 lease->server_address == INADDR_ANY ||
922 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
925 r = DHCP_EVENT_IP_ACQUIRE;
927 if (client->lease->address != lease->address ||
928 client->lease->subnet_mask != lease->subnet_mask ||
929 client->lease->router != lease->router) {
930 r = DHCP_EVENT_IP_CHANGE;
933 lease_free(client->lease);
936 client->lease = lease;
942 static uint64_t client_compute_timeout(uint64_t request_sent,
944 return request_sent + (lifetime - 3) * USEC_PER_SEC +
945 + (random_u32() & 0x1fffff);
948 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) {
949 uint64_t next_timeout;
953 assert(client->event);
955 if (client->lease->lifetime < 10)
958 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
959 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
960 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
962 if (!client->lease->t1)
963 client->lease->t1 = client->lease->lifetime / 2;
965 next_timeout = client_compute_timeout(client->request_sent,
967 if (next_timeout < usec)
970 r = sd_event_add_monotonic(client->event, next_timeout,
972 client_timeout_t1, client,
973 &client->timeout_t1);
977 r = sd_event_source_set_priority(client->timeout_t1, client->event_priority);
981 if (!client->lease->t2)
982 client->lease->t2 = client->lease->lifetime * 7 / 8;
984 if (client->lease->t2 < client->lease->t1)
987 if (client->lease->lifetime < client->lease->t2)
990 next_timeout = client_compute_timeout(client->request_sent,
992 if (next_timeout < usec)
995 r = sd_event_add_monotonic(client->event, next_timeout,
997 client_timeout_t2, client,
998 &client->timeout_t2);
1002 r = sd_event_source_set_priority(client->timeout_t2, client->event_priority);
1006 next_timeout = client_compute_timeout(client->request_sent,
1007 client->lease->lifetime);
1008 if (next_timeout < usec)
1011 r = sd_event_add_monotonic(client->event, next_timeout,
1013 client_timeout_expire, client,
1014 &client->timeout_expire);
1018 r = sd_event_source_set_priority(client->timeout_expire, client->event_priority);
1025 static int client_receive_message(sd_event_source *s, int fd,
1026 uint32_t revents, void *userdata) {
1027 sd_dhcp_client *client = userdata;
1028 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1029 int buflen = sizeof(buf);
1030 int len, r = 0, notify_event = 0;
1031 DHCPPacket *message;
1036 assert(client->event);
1038 len = read(fd, &buf, buflen);
1042 r = sd_event_get_now_monotonic(client->event, &time_now);
1046 switch (client->state) {
1047 case DHCP_STATE_SELECTING:
1049 message = (DHCPPacket *)&buf;
1051 if (client_receive_offer(client, message, len) >= 0) {
1053 client->timeout_resend =
1054 sd_event_source_unref(client->timeout_resend);
1056 client->state = DHCP_STATE_REQUESTING;
1057 client->attempt = 1;
1059 r = sd_event_add_monotonic(client->event, time_now, 0,
1060 client_timeout_resend,
1062 &client->timeout_resend);
1066 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
1073 case DHCP_STATE_REQUESTING:
1074 case DHCP_STATE_RENEWING:
1075 case DHCP_STATE_REBINDING:
1077 r = client_receive_ack(client, buf, len);
1079 if (r == DHCP_EVENT_NO_LEASE)
1083 client->timeout_resend =
1084 sd_event_source_unref(client->timeout_resend);
1086 if (client->state == DHCP_STATE_REQUESTING)
1087 notify_event = DHCP_EVENT_IP_ACQUIRE;
1088 else if (r != DHCP_EVENT_IP_ACQUIRE)
1091 client->state = DHCP_STATE_BOUND;
1092 client->attempt = 1;
1094 client->last_addr = client->lease->address;
1096 r = client_set_lease_timeouts(client, time_now);
1101 client_notify(client, notify_event);
1103 client->receive_message =
1104 sd_event_source_unref(client->receive_message);
1113 case DHCP_STATE_INIT:
1114 case DHCP_STATE_INIT_REBOOT:
1115 case DHCP_STATE_REBOOTING:
1116 case DHCP_STATE_BOUND:
1122 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1123 return client_stop(client, r);
1128 int sd_dhcp_client_start(sd_dhcp_client *client) {
1131 assert_return(client, -EINVAL);
1132 assert_return(client->event, -EINVAL);
1133 assert_return(client->index > 0, -EINVAL);
1134 assert_return(client->state == DHCP_STATE_INIT ||
1135 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1137 client->xid = random_u32();
1139 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1142 client_stop(client, r);
1147 client->start_time = now(CLOCK_MONOTONIC);
1149 return client_initialize_events(client, client->start_time);
1152 int sd_dhcp_client_stop(sd_dhcp_client *client) {
1153 return client_stop(client, DHCP_EVENT_STOP);
1156 int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int priority) {
1159 assert_return(client, -EINVAL);
1160 assert_return(!client->event, -EBUSY);
1163 client->event = sd_event_ref(event);
1165 r = sd_event_default(&client->event);
1170 client->event_priority = priority;
1175 int sd_dhcp_client_detach_event(sd_dhcp_client *client) {
1176 assert_return(client, -EINVAL);
1178 client->event = sd_event_unref(client->event);
1183 sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
1187 return client->event;
1190 void sd_dhcp_client_free(sd_dhcp_client *client) {
1194 sd_dhcp_client_stop(client);
1195 sd_dhcp_client_detach_event(client);
1197 free(client->req_opts);
1201 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free);
1202 #define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep)
1204 int sd_dhcp_client_new(sd_dhcp_client **ret) {
1205 _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
1207 assert_return(ret, -EINVAL);
1209 client = new0(sd_dhcp_client, 1);
1213 client->state = DHCP_STATE_INIT;
1216 client->attempt = 1;
1218 client->req_opts_size = ELEMENTSOF(default_req_opts);
1220 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1221 if (!client->req_opts)