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 switch (client->state) {
307 case DHCP_STATE_INIT:
308 case DHCP_STATE_SELECTING:
309 case DHCP_STATE_REQUESTING:
310 case DHCP_STATE_BOUND:
312 client->start_time = 0;
313 client->state = DHCP_STATE_INIT;
316 case DHCP_STATE_INIT_REBOOT:
317 case DHCP_STATE_REBOOTING:
318 case DHCP_STATE_RENEWING:
319 case DHCP_STATE_REBINDING:
325 lease_free(client->lease);
326 client->lease = NULL;
332 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
333 DHCPMessage *message, uint16_t secs,
334 uint8_t **opt, size_t *optlen) {
338 *opt = (uint8_t *)(message + 1);
344 message->op = BOOTREQUEST;
346 message->hlen = ETHER_ADDR_LEN;
347 message->xid = htobe32(client->xid);
349 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
350 refuse to issue an DHCP lease if 'secs' is set to zero */
351 message->secs = htobe16(secs);
353 if (client->state == DHCP_STATE_RENEWING ||
354 client->state == DHCP_STATE_REBINDING)
355 message->ciaddr = client->lease->address;
357 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
365 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
370 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
371 Identifier option is not set */
372 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
373 ETH_ALEN, &client->mac_addr);
377 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
378 err = dhcp_option_append(opt, optlen,
379 DHCP_OPTION_PARAMETER_REQUEST_LIST,
380 client->req_opts_size,
385 /* Some DHCP servers will send bigger DHCP packets than the
386 defined default size unless the Maximum Messge Size option
387 is explicitely set */
388 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
389 DHCP_CLIENT_MIN_OPTIONS_SIZE);
390 err = dhcp_option_append(opt, optlen,
391 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
400 static uint16_t client_checksum(void *buf, int len) {
409 for (i = 0; i < len / 2 ; i++)
418 sum = (sum & 0xffff) + (sum >> 16);
423 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len) {
424 packet->ip.version = IPVERSION;
425 packet->ip.ihl = DHCP_IP_SIZE / 4;
426 packet->ip.tot_len = htobe16(len);
428 packet->ip.protocol = IPPROTO_UDP;
429 packet->ip.saddr = INADDR_ANY;
430 packet->ip.daddr = INADDR_BROADCAST;
432 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
433 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
434 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
436 packet->ip.check = packet->udp.len;
437 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
439 packet->ip.ttl = IPDEFTTL;
440 packet->ip.check = 0;
441 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
444 static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
446 _cleanup_free_ DHCPPacket *discover;
450 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
451 len = sizeof(DHCPPacket) + optlen;
453 discover = malloc0(len);
458 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
459 secs, &opt, &optlen);
463 if (client->last_addr != INADDR_ANY) {
464 err = dhcp_option_append(&opt, &optlen,
465 DHCP_OPTION_REQUESTED_IP_ADDRESS,
466 4, &client->last_addr);
471 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
475 client_append_ip_headers(discover, len);
477 err = dhcp_network_send_raw_socket(client->fd, &client->link,
483 static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
484 _cleanup_free_ DHCPPacket *request;
489 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
490 len = DHCP_MESSAGE_SIZE + optlen;
492 request = malloc0(len);
496 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
501 if (client->state == DHCP_STATE_REQUESTING) {
502 err = dhcp_option_append(&opt, &optlen,
503 DHCP_OPTION_REQUESTED_IP_ADDRESS,
504 4, &client->lease->address);
508 err = dhcp_option_append(&opt, &optlen,
509 DHCP_OPTION_SERVER_IDENTIFIER,
510 4, &client->lease->server_address);
515 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
519 if (client->state == DHCP_STATE_RENEWING) {
520 err = dhcp_network_send_udp_socket(client->fd,
521 client->lease->server_address,
523 len - DHCP_IP_UDP_SIZE);
525 client_append_ip_headers(request, len);
527 err = dhcp_network_send_raw_socket(client->fd, &client->link,
534 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
536 sd_dhcp_client *client = userdata;
537 usec_t next_timeout = 0;
544 assert(client->event);
546 switch (client->state) {
547 case DHCP_STATE_RENEWING:
549 time_left = (client->lease->t2 - client->lease->t1)/2;
553 next_timeout = usec + time_left * USEC_PER_SEC;
557 case DHCP_STATE_REBINDING:
559 time_left = (client->lease->lifetime - client->lease->t2)/2;
563 next_timeout = usec + time_left * USEC_PER_SEC;
566 case DHCP_STATE_INIT:
567 case DHCP_STATE_INIT_REBOOT:
568 case DHCP_STATE_REBOOTING:
569 case DHCP_STATE_SELECTING:
570 case DHCP_STATE_REQUESTING:
571 case DHCP_STATE_BOUND:
573 if (client->attempt < 64)
574 client->attempt *= 2;
576 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
581 next_timeout += (random_u32() & 0x1fffff);
583 r = sd_event_add_monotonic(client->event, next_timeout,
585 client_timeout_resend, client,
586 &client->timeout_resend);
590 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
594 secs = (usec - client->start_time) / USEC_PER_SEC;
596 switch (client->state) {
597 case DHCP_STATE_INIT:
598 r = client_send_discover(client, secs);
600 client->state = DHCP_STATE_SELECTING;
603 if (client->attempt >= 64)
609 case DHCP_STATE_SELECTING:
610 r = client_send_discover(client, secs);
611 if (r < 0 && client->attempt >= 64)
616 case DHCP_STATE_REQUESTING:
617 case DHCP_STATE_RENEWING:
618 case DHCP_STATE_REBINDING:
619 r = client_send_request(client, secs);
620 if (r < 0 && client->attempt >= 64)
623 client->request_sent = usec;
627 case DHCP_STATE_INIT_REBOOT:
628 case DHCP_STATE_REBOOTING:
629 case DHCP_STATE_BOUND:
637 client_stop(client, r);
639 /* Errors were dealt with when stopping the client, don't spill
640 errors into the event loop handler */
644 static int client_initialize_events(sd_dhcp_client *client, usec_t usec) {
648 assert(client->event);
650 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
651 client_receive_message, client,
652 &client->receive_message);
656 r = sd_event_source_set_priority(client->receive_message, client->event_priority);
660 r = sd_event_add_monotonic(client->event, usec, 0,
661 client_timeout_resend, client,
662 &client->timeout_resend);
666 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
670 client_stop(client, r);
676 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
678 sd_dhcp_client *client = userdata;
680 client_stop(client, DHCP_EVENT_EXPIRED);
685 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
686 sd_dhcp_client *client = userdata;
689 if (client->fd >= 0) {
690 client->receive_message =
691 sd_event_source_unref(client->receive_message);
696 client->state = DHCP_STATE_REBINDING;
699 r = dhcp_network_bind_raw_socket(client->index, &client->link);
701 client_stop(client, r);
707 return client_initialize_events(client, usec);
710 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
711 sd_dhcp_client *client = userdata;
714 client->state = DHCP_STATE_RENEWING;
717 r = dhcp_network_bind_udp_socket(client->index,
718 client->lease->address);
720 client_stop(client, r);
726 return client_initialize_events(client, usec);
729 static int client_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
731 DHCPLease *lease = user_data;
736 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
738 memcpy(&val, option, 4);
739 lease->lifetime = be32toh(val);
744 case DHCP_OPTION_SERVER_IDENTIFIER:
746 memcpy(&lease->server_address, option, 4);
750 case DHCP_OPTION_SUBNET_MASK:
752 memcpy(&lease->subnet_mask, option, 4);
756 case DHCP_OPTION_ROUTER:
758 memcpy(&lease->router, option, 4);
762 case DHCP_OPTION_DOMAIN_NAME_SERVER:
763 if (len && !(len % 4)) {
766 lease->dns_size = len / 4;
769 lease->dns = new0(struct in_addr, lease->dns_size);
773 for (i = 0; i < lease->dns_size; i++) {
774 memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
780 case DHCP_OPTION_INTERFACE_MTU:
784 memcpy(&mtu, option, 2);
785 lease->mtu = be16toh(mtu);
793 case DHCP_OPTION_DOMAIN_NAME:
795 free(lease->domainname);
796 lease->domainname = strndup((const char *)option, len);
801 case DHCP_OPTION_HOST_NAME:
803 free(lease->hostname);
804 lease->hostname = strndup((const char *)option, len);
809 case DHCP_OPTION_RENEWAL_T1_TIME:
811 memcpy(&val, option, 4);
812 lease->t1 = be32toh(val);
817 case DHCP_OPTION_REBINDING_T2_TIME:
819 memcpy(&val, option, 4);
820 lease->t2 = be32toh(val);
829 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
833 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
836 hdrlen = message->ip.ihl * 4;
837 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
841 message->ip.check = message->udp.len;
844 if (hdrlen + be16toh(message->udp.len) > len ||
845 client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
848 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
849 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
852 if (message->dhcp.op != BOOTREPLY)
855 if (be32toh(message->dhcp.xid) != client->xid)
858 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
865 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
867 _cleanup_lease_free_ DHCPLease *lease = NULL;
870 r = client_verify_headers(client, offer, len);
874 lease = new0(DHCPLease, 1);
878 len = len - DHCP_IP_UDP_SIZE;
879 r = dhcp_option_parse(&offer->dhcp, len, client_parse_options,
884 lease->address = offer->dhcp.yiaddr;
886 if (lease->address == INADDR_ANY ||
887 lease->server_address == INADDR_ANY ||
888 lease->subnet_mask == INADDR_ANY ||
889 lease->lifetime == 0)
892 client->lease = lease;
898 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
902 _cleanup_lease_free_ DHCPLease *lease = NULL;
905 if (client->state == DHCP_STATE_RENEWING) {
906 dhcp = (DHCPMessage *)buf;
908 ack = (DHCPPacket *)buf;
910 r = client_verify_headers(client, ack, len);
915 len -= DHCP_IP_UDP_SIZE;
918 lease = new0(DHCPLease, 1);
922 r = dhcp_option_parse(dhcp, len, client_parse_options, lease);
924 return DHCP_EVENT_NO_LEASE;
929 lease->address = dhcp->yiaddr;
931 if (lease->address == INADDR_ANY ||
932 lease->server_address == INADDR_ANY ||
933 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
936 r = DHCP_EVENT_IP_ACQUIRE;
938 if (client->lease->address != lease->address ||
939 client->lease->subnet_mask != lease->subnet_mask ||
940 client->lease->router != lease->router) {
941 r = DHCP_EVENT_IP_CHANGE;
944 lease_free(client->lease);
947 client->lease = lease;
953 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) {
960 uint64_t next_timeout;
964 assert(client->event);
966 if (client->lease->lifetime < 10)
969 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
970 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
971 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
973 if (!client->lease->t1)
974 client->lease->t1 = client->lease->lifetime / 2;
976 next_timeout = client_compute_timeout(client->request_sent,
978 if (next_timeout < usec)
981 r = sd_event_add_monotonic(client->event, next_timeout,
983 client_timeout_t1, client,
984 &client->timeout_t1);
988 r = sd_event_source_set_priority(client->timeout_t1, client->event_priority);
992 if (!client->lease->t2)
993 client->lease->t2 = client->lease->lifetime * 7 / 8;
995 if (client->lease->t2 < client->lease->t1)
998 if (client->lease->lifetime < client->lease->t2)
1001 next_timeout = client_compute_timeout(client->request_sent,
1003 if (next_timeout < usec)
1006 r = sd_event_add_monotonic(client->event, next_timeout,
1008 client_timeout_t2, client,
1009 &client->timeout_t2);
1013 r = sd_event_source_set_priority(client->timeout_t2, client->event_priority);
1017 next_timeout = client_compute_timeout(client->request_sent,
1018 client->lease->lifetime);
1019 if (next_timeout < usec)
1022 r = sd_event_add_monotonic(client->event, next_timeout,
1024 client_timeout_expire, client,
1025 &client->timeout_expire);
1029 r = sd_event_source_set_priority(client->timeout_expire, client->event_priority);
1036 static int client_receive_message(sd_event_source *s, int fd,
1037 uint32_t revents, void *userdata) {
1038 sd_dhcp_client *client = userdata;
1039 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1040 int buflen = sizeof(buf);
1041 int len, r = 0, notify_event = 0;
1042 DHCPPacket *message;
1047 assert(client->event);
1049 len = read(fd, &buf, buflen);
1053 r = sd_event_get_now_monotonic(client->event, &time_now);
1057 switch (client->state) {
1058 case DHCP_STATE_SELECTING:
1060 message = (DHCPPacket *)&buf;
1062 if (client_receive_offer(client, message, len) >= 0) {
1064 client->timeout_resend =
1065 sd_event_source_unref(client->timeout_resend);
1067 client->state = DHCP_STATE_REQUESTING;
1068 client->attempt = 1;
1070 r = sd_event_add_monotonic(client->event, time_now, 0,
1071 client_timeout_resend,
1073 &client->timeout_resend);
1077 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
1084 case DHCP_STATE_REQUESTING:
1085 case DHCP_STATE_RENEWING:
1086 case DHCP_STATE_REBINDING:
1088 r = client_receive_ack(client, buf, len);
1090 if (r == DHCP_EVENT_NO_LEASE)
1094 client->timeout_resend =
1095 sd_event_source_unref(client->timeout_resend);
1097 if (client->state == DHCP_STATE_REQUESTING)
1098 notify_event = DHCP_EVENT_IP_ACQUIRE;
1099 else if (r != DHCP_EVENT_IP_ACQUIRE)
1102 client->state = DHCP_STATE_BOUND;
1103 client->attempt = 1;
1105 client->last_addr = client->lease->address;
1107 r = client_set_lease_timeouts(client, time_now);
1112 client_notify(client, notify_event);
1114 client->receive_message =
1115 sd_event_source_unref(client->receive_message);
1124 case DHCP_STATE_INIT:
1125 case DHCP_STATE_INIT_REBOOT:
1126 case DHCP_STATE_REBOOTING:
1127 case DHCP_STATE_BOUND:
1133 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1134 return client_stop(client, r);
1139 int sd_dhcp_client_start(sd_dhcp_client *client) {
1142 assert_return(client, -EINVAL);
1143 assert_return(client->event, -EINVAL);
1144 assert_return(client->index > 0, -EINVAL);
1145 assert_return(client->state == DHCP_STATE_INIT ||
1146 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1148 client->xid = random_u32();
1150 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1153 client_stop(client, r);
1158 client->start_time = now(CLOCK_MONOTONIC);
1160 return client_initialize_events(client, client->start_time);
1163 int sd_dhcp_client_stop(sd_dhcp_client *client) {
1164 return client_stop(client, DHCP_EVENT_STOP);
1167 int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int priority) {
1170 assert_return(client, -EINVAL);
1171 assert_return(!client->event, -EBUSY);
1174 client->event = sd_event_ref(event);
1176 r = sd_event_default(&client->event);
1181 client->event_priority = priority;
1186 int sd_dhcp_client_detach_event(sd_dhcp_client *client) {
1187 assert_return(client, -EINVAL);
1189 client->event = sd_event_unref(client->event);
1194 sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
1198 return client->event;
1201 void sd_dhcp_client_free(sd_dhcp_client *client) {
1205 sd_dhcp_client_stop(client);
1206 sd_dhcp_client_detach_event(client);
1208 free(client->req_opts);
1212 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free);
1213 #define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep)
1215 int sd_dhcp_client_new(sd_dhcp_client **ret) {
1216 _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
1218 assert_return(ret, -EINVAL);
1220 client = new0(sd_dhcp_client, 1);
1224 client->state = DHCP_STATE_INIT;
1227 client->attempt = 1;
1229 client->req_opts_size = ELEMENTSOF(default_req_opts);
1231 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1232 if (!client->req_opts)