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;
50 typedef struct DHCPLease DHCPLease;
52 struct sd_dhcp_client {
55 sd_event_source *timeout_resend;
58 union sockaddr_union link;
59 sd_event_source *receive_message;
61 size_t req_opts_allocated;
64 struct ether_addr mac_addr;
69 sd_event_source *timeout_t1;
70 sd_event_source *timeout_t2;
71 sd_event_source *timeout_expire;
72 sd_dhcp_client_cb_t cb;
77 static const uint8_t default_req_opts[] = {
78 DHCP_OPTION_SUBNET_MASK,
80 DHCP_OPTION_HOST_NAME,
81 DHCP_OPTION_DOMAIN_NAME,
82 DHCP_OPTION_DOMAIN_NAME_SERVER,
83 DHCP_OPTION_NTP_SERVER,
86 static int client_receive_message(sd_event_source *s, int fd,
87 uint32_t revents, void *userdata);
89 int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
91 assert_return(client, -EINVAL);
94 client->userdata = userdata;
99 int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
102 assert_return(client, -EINVAL);
103 assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
106 case DHCP_OPTION_PAD:
107 case DHCP_OPTION_OVERLOAD:
108 case DHCP_OPTION_MESSAGE_TYPE:
109 case DHCP_OPTION_PARAMETER_REQUEST_LIST:
110 case DHCP_OPTION_END:
117 for (i = 0; i < client->req_opts_size; i++)
118 if (client->req_opts[i] == option)
121 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
122 client->req_opts_size + 1))
125 client->req_opts[client->req_opts_size++] = option;
130 int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
131 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) {
144 assert_return(client, -EINVAL);
145 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
146 assert_return(interface_index >= -1, -EINVAL);
148 client->index = interface_index;
153 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
154 const struct ether_addr *addr) {
155 assert_return(client, -EINVAL);
156 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
158 memcpy(&client->mac_addr, addr, ETH_ALEN);
163 int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr) {
164 assert_return(client, -EINVAL);
165 assert_return(addr, -EINVAL);
167 switch (client->state) {
168 case DHCP_STATE_INIT:
169 case DHCP_STATE_SELECTING:
170 case DHCP_STATE_INIT_REBOOT:
171 case DHCP_STATE_REBOOTING:
172 case DHCP_STATE_REQUESTING:
173 return -EADDRNOTAVAIL;
175 case DHCP_STATE_BOUND:
176 case DHCP_STATE_RENEWING:
177 case DHCP_STATE_REBINDING:
178 addr->s_addr = client->lease->address;
186 int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu) {
187 assert_return(client, -EINVAL);
188 assert_return(mtu, -EINVAL);
190 switch (client->state) {
191 case DHCP_STATE_INIT:
192 case DHCP_STATE_SELECTING:
193 case DHCP_STATE_INIT_REBOOT:
194 case DHCP_STATE_REBOOTING:
195 case DHCP_STATE_REQUESTING:
196 return -EADDRNOTAVAIL;
198 case DHCP_STATE_BOUND:
199 case DHCP_STATE_RENEWING:
200 case DHCP_STATE_REBINDING:
201 if (client->lease->mtu)
202 *mtu = client->lease->mtu;
212 int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr **addr, size_t *addr_size) {
213 assert_return(client, -EINVAL);
214 assert_return(addr, -EINVAL);
215 assert_return(addr_size, -EINVAL);
217 switch (client->state) {
218 case DHCP_STATE_INIT:
219 case DHCP_STATE_SELECTING:
220 case DHCP_STATE_INIT_REBOOT:
221 case DHCP_STATE_REBOOTING:
222 case DHCP_STATE_REQUESTING:
223 return -EADDRNOTAVAIL;
225 case DHCP_STATE_BOUND:
226 case DHCP_STATE_RENEWING:
227 case DHCP_STATE_REBINDING:
228 if (client->lease->dns_size) {
229 *addr_size = client->lease->dns_size;
230 *addr = client->lease->dns;
240 int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname) {
241 assert_return(client, -EINVAL);
242 assert_return(hostname, -EINVAL);
244 switch (client->state) {
245 case DHCP_STATE_INIT:
246 case DHCP_STATE_SELECTING:
247 case DHCP_STATE_INIT_REBOOT:
248 case DHCP_STATE_REBOOTING:
249 case DHCP_STATE_REQUESTING:
250 return -EADDRNOTAVAIL;
252 case DHCP_STATE_BOUND:
253 case DHCP_STATE_RENEWING:
254 case DHCP_STATE_REBINDING:
255 if (client->lease->hostname)
256 *hostname = client->lease->hostname;
266 int sd_dhcp_client_prefixlen(const struct in_addr *addr) {
270 assert_return(addr, -EADDRNOTAVAIL);
272 mask = be32toh(addr->s_addr);
281 int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr) {
282 assert_return(client, -EINVAL);
283 assert_return(addr, -EINVAL);
285 switch (client->state) {
286 case DHCP_STATE_INIT:
287 case DHCP_STATE_SELECTING:
288 case DHCP_STATE_INIT_REBOOT:
289 case DHCP_STATE_REBOOTING:
290 case DHCP_STATE_REQUESTING:
291 return -EADDRNOTAVAIL;
293 case DHCP_STATE_BOUND:
294 case DHCP_STATE_RENEWING:
295 case DHCP_STATE_REBINDING:
296 addr->s_addr = client->lease->router;
304 int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr) {
305 assert_return(client, -EINVAL);
306 assert_return(addr, -EINVAL);
308 switch (client->state) {
309 case DHCP_STATE_INIT:
310 case DHCP_STATE_SELECTING:
311 case DHCP_STATE_INIT_REBOOT:
312 case DHCP_STATE_REBOOTING:
313 case DHCP_STATE_REQUESTING:
314 return -EADDRNOTAVAIL;
316 case DHCP_STATE_BOUND:
317 case DHCP_STATE_RENEWING:
318 case DHCP_STATE_REBINDING:
319 addr->s_addr = client->lease->subnet_mask;
327 static int client_notify(sd_dhcp_client *client, int event) {
329 client->cb(client, event, client->userdata);
334 static void lease_free(DHCPLease *lease) {
338 free(lease->hostname);
343 DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPLease*, lease_free);
344 #define _cleanup_lease_free_ _cleanup_(lease_freep)
346 static int client_stop(sd_dhcp_client *client, int error) {
347 assert_return(client, -EINVAL);
349 client->receive_message =
350 sd_event_source_unref(client->receive_message);
356 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
358 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
359 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
360 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
364 client_notify(client, error);
366 switch (client->state) {
368 case DHCP_STATE_INIT:
369 case DHCP_STATE_SELECTING:
370 case DHCP_STATE_REQUESTING:
371 case DHCP_STATE_BOUND:
373 client->start_time = 0;
374 client->state = DHCP_STATE_INIT;
377 case DHCP_STATE_INIT_REBOOT:
378 case DHCP_STATE_REBOOTING:
379 case DHCP_STATE_RENEWING:
380 case DHCP_STATE_REBINDING:
386 lease_free(client->lease);
387 client->lease = NULL;
393 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
394 DHCPMessage *message, uint16_t secs,
395 uint8_t **opt, size_t *optlen) {
399 *opt = (uint8_t *)(message + 1);
405 message->op = BOOTREQUEST;
407 message->hlen = ETHER_ADDR_LEN;
408 message->xid = htobe32(client->xid);
410 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
411 refuse to issue an DHCP lease if 'secs' is set to zero */
412 message->secs = htobe16(secs);
414 if (client->state == DHCP_STATE_RENEWING ||
415 client->state == DHCP_STATE_REBINDING)
416 message->ciaddr = client->lease->address;
418 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
426 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
431 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
432 Identifier option is not set */
433 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
434 ETH_ALEN, &client->mac_addr);
438 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
439 err = dhcp_option_append(opt, optlen,
440 DHCP_OPTION_PARAMETER_REQUEST_LIST,
441 client->req_opts_size,
446 /* Some DHCP servers will send bigger DHCP packets than the
447 defined default size unless the Maximum Messge Size option
448 is explicitely set */
449 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
450 DHCP_CLIENT_MIN_OPTIONS_SIZE);
451 err = dhcp_option_append(opt, optlen,
452 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
461 static uint16_t client_checksum(void *buf, int len) {
470 for (i = 0; i < len / 2 ; i++)
479 sum = (sum & 0xffff) + (sum >> 16);
484 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len) {
485 packet->ip.version = IPVERSION;
486 packet->ip.ihl = DHCP_IP_SIZE / 4;
487 packet->ip.tot_len = htobe16(len);
489 packet->ip.protocol = IPPROTO_UDP;
490 packet->ip.saddr = INADDR_ANY;
491 packet->ip.daddr = INADDR_BROADCAST;
493 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
494 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
495 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
497 packet->ip.check = packet->udp.len;
498 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
500 packet->ip.ttl = IPDEFTTL;
501 packet->ip.check = 0;
502 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
505 static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
507 _cleanup_free_ DHCPPacket *discover;
511 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
512 len = sizeof(DHCPPacket) + optlen;
514 discover = malloc0(len);
519 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
520 secs, &opt, &optlen);
524 if (client->last_addr != INADDR_ANY) {
525 err = dhcp_option_append(&opt, &optlen,
526 DHCP_OPTION_REQUESTED_IP_ADDRESS,
527 4, &client->last_addr);
532 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
536 client_append_ip_headers(discover, len);
538 err = dhcp_network_send_raw_socket(client->fd, &client->link,
544 static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
545 _cleanup_free_ DHCPPacket *request;
550 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
551 len = DHCP_MESSAGE_SIZE + optlen;
553 request = malloc0(len);
557 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
562 if (client->state == DHCP_STATE_REQUESTING) {
563 err = dhcp_option_append(&opt, &optlen,
564 DHCP_OPTION_REQUESTED_IP_ADDRESS,
565 4, &client->lease->address);
569 err = dhcp_option_append(&opt, &optlen,
570 DHCP_OPTION_SERVER_IDENTIFIER,
571 4, &client->lease->server_address);
576 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
580 if (client->state == DHCP_STATE_RENEWING) {
581 err = dhcp_network_send_udp_socket(client->fd,
582 client->lease->server_address,
584 len - DHCP_IP_UDP_SIZE);
586 client_append_ip_headers(request, len);
588 err = dhcp_network_send_raw_socket(client->fd, &client->link,
595 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
597 sd_dhcp_client *client = userdata;
598 usec_t next_timeout = 0;
603 switch (client->state) {
604 case DHCP_STATE_RENEWING:
606 time_left = (client->lease->t2 - client->lease->t1)/2;
610 next_timeout = usec + time_left * USEC_PER_SEC;
614 case DHCP_STATE_REBINDING:
616 time_left = (client->lease->lifetime - client->lease->t2)/2;
620 next_timeout = usec + time_left * USEC_PER_SEC;
623 case DHCP_STATE_INIT:
624 case DHCP_STATE_INIT_REBOOT:
625 case DHCP_STATE_REBOOTING:
626 case DHCP_STATE_SELECTING:
627 case DHCP_STATE_REQUESTING:
628 case DHCP_STATE_BOUND:
630 if (client->attempt < 64)
631 client->attempt *= 2;
633 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
638 next_timeout += (random_u32() & 0x1fffff);
640 err = sd_event_add_monotonic(client->event, next_timeout,
642 client_timeout_resend, client,
643 &client->timeout_resend);
647 secs = (usec - client->start_time) / USEC_PER_SEC;
649 switch (client->state) {
650 case DHCP_STATE_INIT:
651 err = client_send_discover(client, secs);
653 client->state = DHCP_STATE_SELECTING;
656 if (client->attempt >= 64)
662 case DHCP_STATE_SELECTING:
663 err = client_send_discover(client, secs);
664 if (err < 0 && client->attempt >= 64)
669 case DHCP_STATE_REQUESTING:
670 case DHCP_STATE_RENEWING:
671 case DHCP_STATE_REBINDING:
672 err = client_send_request(client, secs);
673 if (err < 0 && client->attempt >= 64)
676 client->request_sent = usec;
680 case DHCP_STATE_INIT_REBOOT:
681 case DHCP_STATE_REBOOTING:
682 case DHCP_STATE_BOUND:
690 client_stop(client, err);
692 /* Errors were dealt with when stopping the client, don't spill
693 errors into the event loop handler */
697 static int client_initialize_events(sd_dhcp_client *client, usec_t usec) {
700 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
701 client_receive_message, client,
702 &client->receive_message);
706 r = sd_event_add_monotonic(client->event, usec, 0,
707 client_timeout_resend, client,
708 &client->timeout_resend);
712 client_stop(client, r);
718 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
720 sd_dhcp_client *client = userdata;
722 client_stop(client, DHCP_EVENT_EXPIRED);
727 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
728 sd_dhcp_client *client = userdata;
731 if (client->fd >= 0) {
732 client->receive_message =
733 sd_event_source_unref(client->receive_message);
738 client->state = DHCP_STATE_REBINDING;
741 r = dhcp_network_bind_raw_socket(client->index, &client->link);
743 client_stop(client, r);
749 return client_initialize_events(client, usec);
752 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
753 sd_dhcp_client *client = userdata;
756 client->state = DHCP_STATE_RENEWING;
759 r = dhcp_network_bind_udp_socket(client->index,
760 client->lease->address);
762 client_stop(client, r);
768 return client_initialize_events(client, usec);
771 static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
773 DHCPLease *lease = user_data;
778 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
780 memcpy(&val, option, 4);
781 lease->lifetime = be32toh(val);
786 case DHCP_OPTION_SERVER_IDENTIFIER:
788 memcpy(&lease->server_address, option, 4);
792 case DHCP_OPTION_SUBNET_MASK:
794 memcpy(&lease->subnet_mask, option, 4);
798 case DHCP_OPTION_ROUTER:
800 memcpy(&lease->router, option, 4);
804 case DHCP_OPTION_DOMAIN_NAME_SERVER:
808 lease->dns_size = len / 4;
811 lease->dns = new0(struct in_addr, lease->dns_size);
815 for (i = 0; i < lease->dns_size; i++) {
816 memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
822 case DHCP_OPTION_INTERFACE_MTU:
826 memcpy(&mtu, option, 2);
827 lease->mtu = be16toh(mtu);
835 case DHCP_OPTION_HOST_NAME:
837 free(lease->hostname);
838 lease->hostname = strndup((const char *)option, len);
843 case DHCP_OPTION_RENEWAL_T1_TIME:
845 memcpy(&val, option, 4);
846 lease->t1 = be32toh(val);
851 case DHCP_OPTION_REBINDING_T2_TIME:
853 memcpy(&val, option, 4);
854 lease->t2 = be32toh(val);
863 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
867 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
870 hdrlen = message->ip.ihl * 4;
871 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
875 message->ip.check = message->udp.len;
878 if (hdrlen + be16toh(message->udp.len) > len ||
879 client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
882 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
883 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
886 if (message->dhcp.op != BOOTREPLY)
889 if (be32toh(message->dhcp.xid) != client->xid)
892 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
899 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
901 _cleanup_lease_free_ DHCPLease *lease = NULL;
904 r = client_verify_headers(client, offer, len);
908 lease = new0(DHCPLease, 1);
912 len = len - DHCP_IP_UDP_SIZE;
913 r = dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
918 lease->address = offer->dhcp.yiaddr;
920 if (lease->address == INADDR_ANY ||
921 lease->server_address == INADDR_ANY ||
922 lease->subnet_mask == INADDR_ANY ||
923 lease->lifetime == 0)
926 client->lease = lease;
932 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
936 _cleanup_lease_free_ DHCPLease *lease = NULL;
939 if (client->state == DHCP_STATE_RENEWING) {
940 dhcp = (DHCPMessage *)buf;
942 ack = (DHCPPacket *)buf;
944 r = client_verify_headers(client, ack, len);
949 len -= DHCP_IP_UDP_SIZE;
952 lease = new0(DHCPLease, 1);
956 r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
958 return DHCP_EVENT_NO_LEASE;
963 lease->address = dhcp->yiaddr;
965 if (lease->address == INADDR_ANY ||
966 lease->server_address == INADDR_ANY ||
967 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
970 r = DHCP_EVENT_IP_ACQUIRE;
972 if (client->lease->address != lease->address ||
973 client->lease->subnet_mask != lease->subnet_mask ||
974 client->lease->router != lease->router) {
975 r = DHCP_EVENT_IP_CHANGE;
978 lease_free(client->lease);
981 client->lease = lease;
987 static uint64_t client_compute_timeout(uint64_t request_sent,
989 return request_sent + (lifetime - 3) * USEC_PER_SEC +
990 + (random_u32() & 0x1fffff);
993 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) {
994 uint64_t next_timeout;
997 if (client->lease->lifetime < 10)
1000 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
1001 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
1002 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
1004 if (!client->lease->t1)
1005 client->lease->t1 = client->lease->lifetime / 2;
1007 next_timeout = client_compute_timeout(client->request_sent,
1009 if (next_timeout < usec)
1012 r = sd_event_add_monotonic(client->event, next_timeout,
1014 client_timeout_t1, client,
1015 &client->timeout_t1);
1019 if (!client->lease->t2)
1020 client->lease->t2 = client->lease->lifetime * 7 / 8;
1022 if (client->lease->t2 < client->lease->t1)
1025 if (client->lease->lifetime < client->lease->t2)
1028 next_timeout = client_compute_timeout(client->request_sent,
1030 if (next_timeout < usec)
1033 r = sd_event_add_monotonic(client->event, next_timeout,
1035 client_timeout_t2, client,
1036 &client->timeout_t2);
1040 next_timeout = client_compute_timeout(client->request_sent,
1041 client->lease->lifetime);
1042 if (next_timeout < usec)
1045 r = sd_event_add_monotonic(client->event, next_timeout,
1047 client_timeout_expire, client,
1048 &client->timeout_expire);
1055 static int client_receive_message(sd_event_source *s, int fd,
1056 uint32_t revents, void *userdata) {
1057 sd_dhcp_client *client = userdata;
1058 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1059 int buflen = sizeof(buf);
1060 int len, r = 0, notify_event = 0;
1061 DHCPPacket *message;
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);
1095 case DHCP_STATE_REQUESTING:
1096 case DHCP_STATE_RENEWING:
1097 case DHCP_STATE_REBINDING:
1099 r = client_receive_ack(client, buf, len);
1101 if (r == DHCP_EVENT_NO_LEASE)
1105 client->timeout_resend =
1106 sd_event_source_unref(client->timeout_resend);
1108 if (client->state == DHCP_STATE_REQUESTING)
1109 notify_event = DHCP_EVENT_IP_ACQUIRE;
1110 else if (r != DHCP_EVENT_IP_ACQUIRE)
1113 client->state = DHCP_STATE_BOUND;
1114 client->attempt = 1;
1116 client->last_addr = client->lease->address;
1118 r = client_set_lease_timeouts(client, time_now);
1123 client_notify(client, notify_event);
1125 client->receive_message =
1126 sd_event_source_unref(client->receive_message);
1135 case DHCP_STATE_INIT:
1136 case DHCP_STATE_INIT_REBOOT:
1137 case DHCP_STATE_REBOOTING:
1138 case DHCP_STATE_BOUND:
1144 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1145 return client_stop(client, r);
1150 int sd_dhcp_client_start(sd_dhcp_client *client) {
1153 assert_return(client, -EINVAL);
1154 assert_return(client->index > 0, -EINVAL);
1155 assert_return(client->state == DHCP_STATE_INIT ||
1156 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1158 client->xid = random_u32();
1160 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1163 client_stop(client, r);
1168 client->start_time = now(CLOCK_MONOTONIC);
1170 return client_initialize_events(client, client->start_time);
1173 int sd_dhcp_client_stop(sd_dhcp_client *client) {
1174 return client_stop(client, DHCP_EVENT_STOP);
1177 sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client) {
1178 assert_return(client, NULL);
1180 sd_dhcp_client_stop(client);
1182 sd_event_unref(client->event);
1183 free(client->req_opts);
1189 sd_dhcp_client *sd_dhcp_client_new(sd_event *event) {
1190 sd_dhcp_client *client;
1192 assert_return(event, NULL);
1194 client = new0(sd_dhcp_client, 1);
1198 client->event = sd_event_ref(event);
1199 client->state = DHCP_STATE_INIT;
1202 client->attempt = 1;
1204 client->req_opts_size = ELEMENTSOF(default_req_opts);
1206 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1207 if (!client->req_opts) {