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_prefixlen(const struct in_addr *addr) {
247 assert_return(addr, -EADDRNOTAVAIL);
249 mask = be32toh(addr->s_addr);
258 int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr) {
259 assert_return(client, -EINVAL);
260 assert_return(addr, -EINVAL);
262 client_state_machine_check (client->state, -EADDRNOTAVAIL);
264 addr->s_addr = client->lease->router;
269 int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr) {
270 assert_return(client, -EINVAL);
271 assert_return(addr, -EINVAL);
273 client_state_machine_check (client->state, -EADDRNOTAVAIL);
275 addr->s_addr = client->lease->subnet_mask;
280 static int client_notify(sd_dhcp_client *client, int event) {
282 client->cb(client, event, client->userdata);
287 static void lease_free(DHCPLease *lease) {
291 free(lease->hostname);
292 free(lease->domainname);
297 DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPLease*, lease_free);
298 #define _cleanup_lease_free_ _cleanup_(lease_freep)
300 static int client_stop(sd_dhcp_client *client, int error) {
301 assert_return(client, -EINVAL);
303 client->receive_message =
304 sd_event_source_unref(client->receive_message);
310 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
312 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
313 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
314 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
318 client_notify(client, error);
320 switch (client->state) {
322 case DHCP_STATE_INIT:
323 case DHCP_STATE_SELECTING:
324 case DHCP_STATE_REQUESTING:
325 case DHCP_STATE_BOUND:
327 client->start_time = 0;
328 client->state = DHCP_STATE_INIT;
331 case DHCP_STATE_INIT_REBOOT:
332 case DHCP_STATE_REBOOTING:
333 case DHCP_STATE_RENEWING:
334 case DHCP_STATE_REBINDING:
340 lease_free(client->lease);
341 client->lease = NULL;
347 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
348 DHCPMessage *message, uint16_t secs,
349 uint8_t **opt, size_t *optlen) {
353 *opt = (uint8_t *)(message + 1);
359 message->op = BOOTREQUEST;
361 message->hlen = ETHER_ADDR_LEN;
362 message->xid = htobe32(client->xid);
364 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
365 refuse to issue an DHCP lease if 'secs' is set to zero */
366 message->secs = htobe16(secs);
368 if (client->state == DHCP_STATE_RENEWING ||
369 client->state == DHCP_STATE_REBINDING)
370 message->ciaddr = client->lease->address;
372 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
380 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
385 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
386 Identifier option is not set */
387 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
388 ETH_ALEN, &client->mac_addr);
392 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
393 err = dhcp_option_append(opt, optlen,
394 DHCP_OPTION_PARAMETER_REQUEST_LIST,
395 client->req_opts_size,
400 /* Some DHCP servers will send bigger DHCP packets than the
401 defined default size unless the Maximum Messge Size option
402 is explicitely set */
403 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
404 DHCP_CLIENT_MIN_OPTIONS_SIZE);
405 err = dhcp_option_append(opt, optlen,
406 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
415 static uint16_t client_checksum(void *buf, int len) {
424 for (i = 0; i < len / 2 ; i++)
433 sum = (sum & 0xffff) + (sum >> 16);
438 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len) {
439 packet->ip.version = IPVERSION;
440 packet->ip.ihl = DHCP_IP_SIZE / 4;
441 packet->ip.tot_len = htobe16(len);
443 packet->ip.protocol = IPPROTO_UDP;
444 packet->ip.saddr = INADDR_ANY;
445 packet->ip.daddr = INADDR_BROADCAST;
447 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
448 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
449 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
451 packet->ip.check = packet->udp.len;
452 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
454 packet->ip.ttl = IPDEFTTL;
455 packet->ip.check = 0;
456 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
459 static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
461 _cleanup_free_ DHCPPacket *discover;
465 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
466 len = sizeof(DHCPPacket) + optlen;
468 discover = malloc0(len);
473 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
474 secs, &opt, &optlen);
478 if (client->last_addr != INADDR_ANY) {
479 err = dhcp_option_append(&opt, &optlen,
480 DHCP_OPTION_REQUESTED_IP_ADDRESS,
481 4, &client->last_addr);
486 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
490 client_append_ip_headers(discover, len);
492 err = dhcp_network_send_raw_socket(client->fd, &client->link,
498 static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
499 _cleanup_free_ DHCPPacket *request;
504 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
505 len = DHCP_MESSAGE_SIZE + optlen;
507 request = malloc0(len);
511 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
516 if (client->state == DHCP_STATE_REQUESTING) {
517 err = dhcp_option_append(&opt, &optlen,
518 DHCP_OPTION_REQUESTED_IP_ADDRESS,
519 4, &client->lease->address);
523 err = dhcp_option_append(&opt, &optlen,
524 DHCP_OPTION_SERVER_IDENTIFIER,
525 4, &client->lease->server_address);
530 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
534 if (client->state == DHCP_STATE_RENEWING) {
535 err = dhcp_network_send_udp_socket(client->fd,
536 client->lease->server_address,
538 len - DHCP_IP_UDP_SIZE);
540 client_append_ip_headers(request, len);
542 err = dhcp_network_send_raw_socket(client->fd, &client->link,
549 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
551 sd_dhcp_client *client = userdata;
552 usec_t next_timeout = 0;
559 assert(client->event);
561 switch (client->state) {
562 case DHCP_STATE_RENEWING:
564 time_left = (client->lease->t2 - client->lease->t1)/2;
568 next_timeout = usec + time_left * USEC_PER_SEC;
572 case DHCP_STATE_REBINDING:
574 time_left = (client->lease->lifetime - client->lease->t2)/2;
578 next_timeout = usec + time_left * USEC_PER_SEC;
581 case DHCP_STATE_INIT:
582 case DHCP_STATE_INIT_REBOOT:
583 case DHCP_STATE_REBOOTING:
584 case DHCP_STATE_SELECTING:
585 case DHCP_STATE_REQUESTING:
586 case DHCP_STATE_BOUND:
588 if (client->attempt < 64)
589 client->attempt *= 2;
591 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
596 next_timeout += (random_u32() & 0x1fffff);
598 r = sd_event_add_monotonic(client->event, next_timeout,
600 client_timeout_resend, client,
601 &client->timeout_resend);
605 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
609 secs = (usec - client->start_time) / USEC_PER_SEC;
611 switch (client->state) {
612 case DHCP_STATE_INIT:
613 r = client_send_discover(client, secs);
615 client->state = DHCP_STATE_SELECTING;
618 if (client->attempt >= 64)
624 case DHCP_STATE_SELECTING:
625 r = client_send_discover(client, secs);
626 if (r < 0 && client->attempt >= 64)
631 case DHCP_STATE_REQUESTING:
632 case DHCP_STATE_RENEWING:
633 case DHCP_STATE_REBINDING:
634 r = client_send_request(client, secs);
635 if (r < 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, r);
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 assert(client->event);
665 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
666 client_receive_message, client,
667 &client->receive_message);
671 r = sd_event_source_set_priority(client->receive_message, client->event_priority);
675 r = sd_event_add_monotonic(client->event, usec, 0,
676 client_timeout_resend, client,
677 &client->timeout_resend);
681 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
685 client_stop(client, r);
691 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
693 sd_dhcp_client *client = userdata;
695 client_stop(client, DHCP_EVENT_EXPIRED);
700 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
701 sd_dhcp_client *client = userdata;
704 if (client->fd >= 0) {
705 client->receive_message =
706 sd_event_source_unref(client->receive_message);
711 client->state = DHCP_STATE_REBINDING;
714 r = dhcp_network_bind_raw_socket(client->index, &client->link);
716 client_stop(client, r);
722 return client_initialize_events(client, usec);
725 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
726 sd_dhcp_client *client = userdata;
729 client->state = DHCP_STATE_RENEWING;
732 r = dhcp_network_bind_udp_socket(client->index,
733 client->lease->address);
735 client_stop(client, r);
741 return client_initialize_events(client, usec);
744 static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
746 DHCPLease *lease = user_data;
751 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
753 memcpy(&val, option, 4);
754 lease->lifetime = be32toh(val);
759 case DHCP_OPTION_SERVER_IDENTIFIER:
761 memcpy(&lease->server_address, option, 4);
765 case DHCP_OPTION_SUBNET_MASK:
767 memcpy(&lease->subnet_mask, option, 4);
771 case DHCP_OPTION_ROUTER:
773 memcpy(&lease->router, option, 4);
777 case DHCP_OPTION_DOMAIN_NAME_SERVER:
781 lease->dns_size = len / 4;
784 lease->dns = new0(struct in_addr, lease->dns_size);
788 for (i = 0; i < lease->dns_size; i++) {
789 memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
795 case DHCP_OPTION_INTERFACE_MTU:
799 memcpy(&mtu, option, 2);
800 lease->mtu = be16toh(mtu);
808 case DHCP_OPTION_DOMAIN_NAME:
810 free(lease->domainname);
811 lease->domainname = strndup((const char *)option, len);
816 case DHCP_OPTION_HOST_NAME:
818 free(lease->hostname);
819 lease->hostname = strndup((const char *)option, len);
824 case DHCP_OPTION_RENEWAL_T1_TIME:
826 memcpy(&val, option, 4);
827 lease->t1 = be32toh(val);
832 case DHCP_OPTION_REBINDING_T2_TIME:
834 memcpy(&val, option, 4);
835 lease->t2 = be32toh(val);
844 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
848 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
851 hdrlen = message->ip.ihl * 4;
852 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
856 message->ip.check = message->udp.len;
859 if (hdrlen + be16toh(message->udp.len) > len ||
860 client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
863 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
864 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
867 if (message->dhcp.op != BOOTREPLY)
870 if (be32toh(message->dhcp.xid) != client->xid)
873 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
880 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
882 _cleanup_lease_free_ DHCPLease *lease = NULL;
885 r = client_verify_headers(client, offer, len);
889 lease = new0(DHCPLease, 1);
893 len = len - DHCP_IP_UDP_SIZE;
894 r = dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
899 lease->address = offer->dhcp.yiaddr;
901 if (lease->address == INADDR_ANY ||
902 lease->server_address == INADDR_ANY ||
903 lease->subnet_mask == INADDR_ANY ||
904 lease->lifetime == 0)
907 client->lease = lease;
913 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
917 _cleanup_lease_free_ DHCPLease *lease = NULL;
920 if (client->state == DHCP_STATE_RENEWING) {
921 dhcp = (DHCPMessage *)buf;
923 ack = (DHCPPacket *)buf;
925 r = client_verify_headers(client, ack, len);
930 len -= DHCP_IP_UDP_SIZE;
933 lease = new0(DHCPLease, 1);
937 r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
939 return DHCP_EVENT_NO_LEASE;
944 lease->address = dhcp->yiaddr;
946 if (lease->address == INADDR_ANY ||
947 lease->server_address == INADDR_ANY ||
948 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
951 r = DHCP_EVENT_IP_ACQUIRE;
953 if (client->lease->address != lease->address ||
954 client->lease->subnet_mask != lease->subnet_mask ||
955 client->lease->router != lease->router) {
956 r = DHCP_EVENT_IP_CHANGE;
959 lease_free(client->lease);
962 client->lease = lease;
968 static uint64_t client_compute_timeout(uint64_t request_sent,
970 return request_sent + (lifetime - 3) * USEC_PER_SEC +
971 + (random_u32() & 0x1fffff);
974 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) {
975 uint64_t next_timeout;
979 assert(client->event);
981 if (client->lease->lifetime < 10)
984 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
985 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
986 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
988 if (!client->lease->t1)
989 client->lease->t1 = client->lease->lifetime / 2;
991 next_timeout = client_compute_timeout(client->request_sent,
993 if (next_timeout < usec)
996 r = sd_event_add_monotonic(client->event, next_timeout,
998 client_timeout_t1, client,
999 &client->timeout_t1);
1003 r = sd_event_source_set_priority(client->timeout_t1, client->event_priority);
1007 if (!client->lease->t2)
1008 client->lease->t2 = client->lease->lifetime * 7 / 8;
1010 if (client->lease->t2 < client->lease->t1)
1013 if (client->lease->lifetime < client->lease->t2)
1016 next_timeout = client_compute_timeout(client->request_sent,
1018 if (next_timeout < usec)
1021 r = sd_event_add_monotonic(client->event, next_timeout,
1023 client_timeout_t2, client,
1024 &client->timeout_t2);
1028 r = sd_event_source_set_priority(client->timeout_t2, client->event_priority);
1032 next_timeout = client_compute_timeout(client->request_sent,
1033 client->lease->lifetime);
1034 if (next_timeout < usec)
1037 r = sd_event_add_monotonic(client->event, next_timeout,
1039 client_timeout_expire, client,
1040 &client->timeout_expire);
1044 r = sd_event_source_set_priority(client->timeout_expire, client->event_priority);
1051 static int client_receive_message(sd_event_source *s, int fd,
1052 uint32_t revents, void *userdata) {
1053 sd_dhcp_client *client = userdata;
1054 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1055 int buflen = sizeof(buf);
1056 int len, r = 0, notify_event = 0;
1057 DHCPPacket *message;
1062 assert(client->event);
1064 len = read(fd, &buf, buflen);
1068 r = sd_event_get_now_monotonic(client->event, &time_now);
1072 switch (client->state) {
1073 case DHCP_STATE_SELECTING:
1075 message = (DHCPPacket *)&buf;
1077 if (client_receive_offer(client, message, len) >= 0) {
1079 client->timeout_resend =
1080 sd_event_source_unref(client->timeout_resend);
1082 client->state = DHCP_STATE_REQUESTING;
1083 client->attempt = 1;
1085 r = sd_event_add_monotonic(client->event, time_now, 0,
1086 client_timeout_resend,
1088 &client->timeout_resend);
1092 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
1099 case DHCP_STATE_REQUESTING:
1100 case DHCP_STATE_RENEWING:
1101 case DHCP_STATE_REBINDING:
1103 r = client_receive_ack(client, buf, len);
1105 if (r == DHCP_EVENT_NO_LEASE)
1109 client->timeout_resend =
1110 sd_event_source_unref(client->timeout_resend);
1112 if (client->state == DHCP_STATE_REQUESTING)
1113 notify_event = DHCP_EVENT_IP_ACQUIRE;
1114 else if (r != DHCP_EVENT_IP_ACQUIRE)
1117 client->state = DHCP_STATE_BOUND;
1118 client->attempt = 1;
1120 client->last_addr = client->lease->address;
1122 r = client_set_lease_timeouts(client, time_now);
1127 client_notify(client, notify_event);
1129 client->receive_message =
1130 sd_event_source_unref(client->receive_message);
1139 case DHCP_STATE_INIT:
1140 case DHCP_STATE_INIT_REBOOT:
1141 case DHCP_STATE_REBOOTING:
1142 case DHCP_STATE_BOUND:
1148 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1149 return client_stop(client, r);
1154 int sd_dhcp_client_start(sd_dhcp_client *client) {
1157 assert_return(client, -EINVAL);
1158 assert_return(client->event, -EINVAL);
1159 assert_return(client->index > 0, -EINVAL);
1160 assert_return(client->state == DHCP_STATE_INIT ||
1161 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1163 client->xid = random_u32();
1165 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1168 client_stop(client, r);
1173 client->start_time = now(CLOCK_MONOTONIC);
1175 return client_initialize_events(client, client->start_time);
1178 int sd_dhcp_client_stop(sd_dhcp_client *client) {
1179 return client_stop(client, DHCP_EVENT_STOP);
1182 int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int priority) {
1185 assert_return(client, -EINVAL);
1186 assert_return(!client->event, -EBUSY);
1189 client->event = sd_event_ref(event);
1191 r = sd_event_default(&client->event);
1196 client->event_priority = priority;
1201 int sd_dhcp_client_detach_event(sd_dhcp_client *client) {
1202 assert_return(client, -EINVAL);
1204 client->event = sd_event_unref(client->event);
1209 sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
1213 return client->event;
1216 void sd_dhcp_client_free(sd_dhcp_client *client) {
1220 sd_dhcp_client_stop(client);
1221 sd_dhcp_client_detach_event(client);
1223 free(client->req_opts);
1227 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free);
1228 #define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep)
1230 int sd_dhcp_client_new(sd_dhcp_client **ret) {
1231 _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
1233 assert_return(ret, -EINVAL);
1235 client = new0(sd_dhcp_client, 1);
1239 client->state = DHCP_STATE_INIT;
1242 client->attempt = 1;
1244 client->req_opts_size = ELEMENTSOF(default_req_opts);
1246 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1247 if (!client->req_opts)