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;
49 typedef struct DHCPLease DHCPLease;
51 struct sd_dhcp_client {
54 sd_event_source *timeout_resend;
57 union sockaddr_union link;
58 sd_event_source *receive_message;
60 size_t req_opts_allocated;
63 struct ether_addr mac_addr;
68 sd_event_source *timeout_t1;
69 sd_event_source *timeout_t2;
70 sd_event_source *timeout_expire;
71 sd_dhcp_client_cb_t cb;
76 static const uint8_t default_req_opts[] = {
77 DHCP_OPTION_SUBNET_MASK,
79 DHCP_OPTION_HOST_NAME,
80 DHCP_OPTION_DOMAIN_NAME,
81 DHCP_OPTION_DOMAIN_NAME_SERVER,
82 DHCP_OPTION_NTP_SERVER,
85 static int client_receive_message(sd_event_source *s, int fd,
86 uint32_t revents, void *userdata);
88 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)
103 assert_return(client, -EINVAL);
104 assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
107 case DHCP_OPTION_PAD:
108 case DHCP_OPTION_OVERLOAD:
109 case DHCP_OPTION_MESSAGE_TYPE:
110 case DHCP_OPTION_PARAMETER_REQUEST_LIST:
111 case DHCP_OPTION_END:
118 for (i = 0; i < client->req_opts_size; i++)
119 if (client->req_opts[i] == option)
122 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
123 client->req_opts_size + 1))
126 client->req_opts[client->req_opts_size++] = option;
131 int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
132 const struct in_addr *last_addr)
134 assert_return(client, -EINVAL);
135 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
138 client->last_addr = last_addr->s_addr;
140 client->last_addr = INADDR_ANY;
145 int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index)
147 assert_return(client, -EINVAL);
148 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
149 assert_return(interface_index >= -1, -EINVAL);
151 client->index = interface_index;
156 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
157 const struct ether_addr *addr)
159 assert_return(client, -EINVAL);
160 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
162 memcpy(&client->mac_addr, addr, ETH_ALEN);
167 int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr)
169 assert_return(client, -EINVAL);
170 assert_return(addr, -EINVAL);
172 switch (client->state) {
173 case DHCP_STATE_INIT:
174 case DHCP_STATE_SELECTING:
175 case DHCP_STATE_INIT_REBOOT:
176 case DHCP_STATE_REBOOTING:
177 case DHCP_STATE_REQUESTING:
178 return -EADDRNOTAVAIL;
180 case DHCP_STATE_BOUND:
181 case DHCP_STATE_RENEWING:
182 case DHCP_STATE_REBINDING:
183 addr->s_addr = client->lease->address;
191 int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu)
193 assert_return(client, -EINVAL);
194 assert_return(mtu, -EINVAL);
196 switch (client->state) {
197 case DHCP_STATE_INIT:
198 case DHCP_STATE_SELECTING:
199 case DHCP_STATE_INIT_REBOOT:
200 case DHCP_STATE_REBOOTING:
201 case DHCP_STATE_REQUESTING:
202 return -EADDRNOTAVAIL;
204 case DHCP_STATE_BOUND:
205 case DHCP_STATE_RENEWING:
206 case DHCP_STATE_REBINDING:
207 if (client->lease->mtu)
208 *mtu = client->lease->mtu;
218 int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr ***addr)
220 assert_return(client, -EINVAL);
221 assert_return(addr, -EINVAL);
223 switch (client->state) {
224 case DHCP_STATE_INIT:
225 case DHCP_STATE_SELECTING:
226 case DHCP_STATE_INIT_REBOOT:
227 case DHCP_STATE_REBOOTING:
228 case DHCP_STATE_REQUESTING:
229 return -EADDRNOTAVAIL;
231 case DHCP_STATE_BOUND:
232 case DHCP_STATE_RENEWING:
233 case DHCP_STATE_REBINDING:
234 if (client->lease->dns)
235 *addr = client->lease->dns;
245 int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname)
247 assert_return(client, -EINVAL);
248 assert_return(hostname, -EINVAL);
250 switch (client->state) {
251 case DHCP_STATE_INIT:
252 case DHCP_STATE_SELECTING:
253 case DHCP_STATE_INIT_REBOOT:
254 case DHCP_STATE_REBOOTING:
255 case DHCP_STATE_REQUESTING:
256 return -EADDRNOTAVAIL;
258 case DHCP_STATE_BOUND:
259 case DHCP_STATE_RENEWING:
260 case DHCP_STATE_REBINDING:
261 if (client->lease->hostname)
262 *hostname = client->lease->hostname;
272 int sd_dhcp_client_prefixlen(const struct in_addr *addr)
277 assert_return(addr, -EADDRNOTAVAIL);
279 mask = be32toh(addr->s_addr);
288 int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr)
290 assert_return(client, -EINVAL);
291 assert_return(addr, -EINVAL);
293 switch (client->state) {
294 case DHCP_STATE_INIT:
295 case DHCP_STATE_SELECTING:
296 case DHCP_STATE_INIT_REBOOT:
297 case DHCP_STATE_REBOOTING:
298 case DHCP_STATE_REQUESTING:
299 return -EADDRNOTAVAIL;
301 case DHCP_STATE_BOUND:
302 case DHCP_STATE_RENEWING:
303 case DHCP_STATE_REBINDING:
304 addr->s_addr = client->lease->router;
312 int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
314 assert_return(client, -EINVAL);
315 assert_return(addr, -EINVAL);
317 switch (client->state) {
318 case DHCP_STATE_INIT:
319 case DHCP_STATE_SELECTING:
320 case DHCP_STATE_INIT_REBOOT:
321 case DHCP_STATE_REBOOTING:
322 case DHCP_STATE_REQUESTING:
323 return -EADDRNOTAVAIL;
325 case DHCP_STATE_BOUND:
326 case DHCP_STATE_RENEWING:
327 case DHCP_STATE_REBINDING:
328 addr->s_addr = client->lease->subnet_mask;
336 static int client_notify(sd_dhcp_client *client, int event)
339 client->cb(client, event, client->userdata);
344 static void in_addrs_free(struct in_addr **addrs) {
350 for (i = 0; addrs[i]; i++)
356 static int client_stop(sd_dhcp_client *client, int error)
358 assert_return(client, -EINVAL);
360 client->receive_message =
361 sd_event_source_unref(client->receive_message);
367 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
369 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
370 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
371 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
375 client_notify(client, error);
377 switch (client->state) {
379 case DHCP_STATE_INIT:
380 case DHCP_STATE_SELECTING:
381 case DHCP_STATE_REQUESTING:
382 case DHCP_STATE_BOUND:
384 client->start_time = 0;
385 client->state = DHCP_STATE_INIT;
388 case DHCP_STATE_INIT_REBOOT:
389 case DHCP_STATE_REBOOTING:
390 case DHCP_STATE_RENEWING:
391 case DHCP_STATE_REBINDING:
397 in_addrs_free(client->lease->dns);
399 client->lease = NULL;
405 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
406 DHCPMessage *message, uint16_t secs,
407 uint8_t **opt, size_t *optlen)
412 *opt = (uint8_t *)(message + 1);
418 message->op = BOOTREQUEST;
420 message->hlen = ETHER_ADDR_LEN;
421 message->xid = htobe32(client->xid);
423 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
424 refuse to issue an DHCP lease if 'secs' is set to zero */
425 message->secs = htobe16(secs);
427 if (client->state == DHCP_STATE_RENEWING ||
428 client->state == DHCP_STATE_REBINDING)
429 message->ciaddr = client->lease->address;
431 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
439 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
444 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
445 Identifier option is not set */
446 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
447 ETH_ALEN, &client->mac_addr);
451 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
452 err = dhcp_option_append(opt, optlen,
453 DHCP_OPTION_PARAMETER_REQUEST_LIST,
454 client->req_opts_size,
459 /* Some DHCP servers will send bigger DHCP packets than the
460 defined default size unless the Maximum Messge Size option
461 is explicitely set */
462 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
463 DHCP_CLIENT_MIN_OPTIONS_SIZE);
464 err = dhcp_option_append(opt, optlen,
465 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
474 static uint16_t client_checksum(void *buf, int len)
484 for (i = 0; i < len / 2 ; i++)
493 sum = (sum & 0xffff) + (sum >> 16);
498 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len)
500 packet->ip.version = IPVERSION;
501 packet->ip.ihl = DHCP_IP_SIZE / 4;
502 packet->ip.tot_len = htobe16(len);
504 packet->ip.protocol = IPPROTO_UDP;
505 packet->ip.saddr = INADDR_ANY;
506 packet->ip.daddr = INADDR_BROADCAST;
508 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
509 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
510 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
512 packet->ip.check = packet->udp.len;
513 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
515 packet->ip.ttl = IPDEFTTL;
516 packet->ip.check = 0;
517 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
520 static int client_send_discover(sd_dhcp_client *client, uint16_t secs)
523 _cleanup_free_ DHCPPacket *discover;
527 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
528 len = sizeof(DHCPPacket) + optlen;
530 discover = malloc0(len);
535 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
536 secs, &opt, &optlen);
540 if (client->last_addr != INADDR_ANY) {
541 err = dhcp_option_append(&opt, &optlen,
542 DHCP_OPTION_REQUESTED_IP_ADDRESS,
543 4, &client->last_addr);
548 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
552 client_append_ip_headers(discover, len);
554 err = dhcp_network_send_raw_socket(client->fd, &client->link,
560 static int client_send_request(sd_dhcp_client *client, uint16_t secs)
562 _cleanup_free_ DHCPPacket *request;
567 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
568 len = DHCP_MESSAGE_SIZE + optlen;
570 request = malloc0(len);
574 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
579 if (client->state == DHCP_STATE_REQUESTING) {
580 err = dhcp_option_append(&opt, &optlen,
581 DHCP_OPTION_REQUESTED_IP_ADDRESS,
582 4, &client->lease->address);
586 err = dhcp_option_append(&opt, &optlen,
587 DHCP_OPTION_SERVER_IDENTIFIER,
588 4, &client->lease->server_address);
593 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
597 if (client->state == DHCP_STATE_RENEWING) {
598 err = dhcp_network_send_udp_socket(client->fd,
599 client->lease->server_address,
601 len - DHCP_IP_UDP_SIZE);
603 client_append_ip_headers(request, len);
605 err = dhcp_network_send_raw_socket(client->fd, &client->link,
612 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
615 sd_dhcp_client *client = userdata;
616 usec_t next_timeout = 0;
621 switch (client->state) {
622 case DHCP_STATE_RENEWING:
624 time_left = (client->lease->t2 - client->lease->t1)/2;
628 next_timeout = usec + time_left * USEC_PER_SEC;
632 case DHCP_STATE_REBINDING:
634 time_left = (client->lease->lifetime - client->lease->t2)/2;
638 next_timeout = usec + time_left * USEC_PER_SEC;
641 case DHCP_STATE_INIT:
642 case DHCP_STATE_INIT_REBOOT:
643 case DHCP_STATE_REBOOTING:
644 case DHCP_STATE_SELECTING:
645 case DHCP_STATE_REQUESTING:
646 case DHCP_STATE_BOUND:
648 if (client->attempt < 64)
649 client->attempt *= 2;
651 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
656 next_timeout += (random_u32() & 0x1fffff);
658 err = sd_event_add_monotonic(client->event, next_timeout,
660 client_timeout_resend, client,
661 &client->timeout_resend);
665 secs = (usec - client->start_time) / USEC_PER_SEC;
667 switch (client->state) {
668 case DHCP_STATE_INIT:
669 err = client_send_discover(client, secs);
671 client->state = DHCP_STATE_SELECTING;
674 if (client->attempt >= 64)
680 case DHCP_STATE_SELECTING:
681 err = client_send_discover(client, secs);
682 if (err < 0 && client->attempt >= 64)
687 case DHCP_STATE_REQUESTING:
688 case DHCP_STATE_RENEWING:
689 case DHCP_STATE_REBINDING:
690 err = client_send_request(client, secs);
691 if (err < 0 && client->attempt >= 64)
694 client->request_sent = usec;
698 case DHCP_STATE_INIT_REBOOT:
699 case DHCP_STATE_REBOOTING:
700 case DHCP_STATE_BOUND:
708 client_stop(client, err);
710 /* Errors were dealt with when stopping the client, don't spill
711 errors into the event loop handler */
715 static int client_initialize_events(sd_dhcp_client *client, usec_t usec)
719 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
720 client_receive_message, client,
721 &client->receive_message);
725 r = sd_event_add_monotonic(client->event, usec, 0,
726 client_timeout_resend, client,
727 &client->timeout_resend);
731 client_stop(client, r);
737 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
740 sd_dhcp_client *client = userdata;
742 client_stop(client, DHCP_EVENT_EXPIRED);
747 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
749 sd_dhcp_client *client = userdata;
752 if (client->fd >= 0) {
753 client->receive_message =
754 sd_event_source_unref(client->receive_message);
759 client->state = DHCP_STATE_REBINDING;
762 r = dhcp_network_bind_raw_socket(client->index, &client->link);
764 client_stop(client, r);
770 return client_initialize_events(client, usec);
773 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata)
775 sd_dhcp_client *client = userdata;
778 client->state = DHCP_STATE_RENEWING;
781 r = dhcp_network_bind_udp_socket(client->index,
782 client->lease->address);
784 client_stop(client, r);
790 return client_initialize_events(client, usec);
793 static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
796 DHCPLease *lease = user_data;
801 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
803 memcpy(&val, option, 4);
804 lease->lifetime = be32toh(val);
809 case DHCP_OPTION_SERVER_IDENTIFIER:
811 memcpy(&lease->server_address, option, 4);
815 case DHCP_OPTION_SUBNET_MASK:
817 memcpy(&lease->subnet_mask, option, 4);
821 case DHCP_OPTION_ROUTER:
823 memcpy(&lease->router, option, 4);
827 case DHCP_OPTION_DOMAIN_NAME_SERVER:
831 in_addrs_free(lease->dns);
833 lease->dns = new0(struct in_addr*, len / 4 + 1);
837 for (i = 0; i < len / 4; i++) {
838 lease->dns[i] = new0(struct in_addr, 1);
839 memcpy(&lease->dns[i]->s_addr, option + 4 * i, 4);
842 lease->dns[len / 4] = NULL;
847 case DHCP_OPTION_INTERFACE_MTU:
851 memcpy(&mtu, option, 2);
852 lease->mtu = be16toh(mtu);
860 case DHCP_OPTION_HOST_NAME:
862 free(lease->hostname);
863 lease->hostname = strndup((const char *)option, len);
868 case DHCP_OPTION_RENEWAL_T1_TIME:
870 memcpy(&val, option, 4);
871 lease->t1 = be32toh(val);
876 case DHCP_OPTION_REBINDING_T2_TIME:
878 memcpy(&val, option, 4);
879 lease->t2 = be32toh(val);
888 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
893 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
896 hdrlen = message->ip.ihl * 4;
897 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
901 message->ip.check = message->udp.len;
904 if (hdrlen + be16toh(message->udp.len) > len ||
905 client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
908 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
909 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
912 if (message->dhcp.op != BOOTREPLY)
915 if (be32toh(message->dhcp.xid) != client->xid)
918 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
925 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
931 err = client_verify_headers(client, offer, len);
935 lease = new0(DHCPLease, 1);
939 len = len - DHCP_IP_UDP_SIZE;
940 if (dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
941 lease) != DHCP_OFFER)
944 lease->address = offer->dhcp.yiaddr;
946 if (lease->address == INADDR_ANY ||
947 lease->server_address == INADDR_ANY ||
948 lease->subnet_mask == INADDR_ANY ||
949 lease->lifetime == 0)
952 client->lease = lease;
962 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
970 if (client->state == DHCP_STATE_RENEWING) {
971 dhcp = (DHCPMessage *)buf;
973 ack = (DHCPPacket *)buf;
975 r = client_verify_headers(client, ack, len);
980 len -= DHCP_IP_UDP_SIZE;
983 lease = new0(DHCPLease, 1);
987 r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
990 r = DHCP_EVENT_NO_LEASE;
999 lease->address = dhcp->yiaddr;
1001 if (lease->address == INADDR_ANY ||
1002 lease->server_address == INADDR_ANY ||
1003 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0) {
1008 r = DHCP_EVENT_IP_ACQUIRE;
1009 if (client->lease) {
1010 if (client->lease->address != lease->address ||
1011 client->lease->subnet_mask != lease->subnet_mask ||
1012 client->lease->router != lease->router) {
1013 r = DHCP_EVENT_IP_CHANGE;
1016 free(client->lease);
1019 client->lease = lease;
1029 static uint64_t client_compute_timeout(uint64_t request_sent,
1032 return request_sent + (lifetime - 3) * USEC_PER_SEC +
1033 + (random_u32() & 0x1fffff);
1036 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec)
1039 uint64_t next_timeout;
1041 if (client->lease->lifetime < 10)
1044 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
1045 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
1046 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
1048 if (!client->lease->t1)
1049 client->lease->t1 = client->lease->lifetime / 2;
1051 next_timeout = client_compute_timeout(client->request_sent,
1053 if (next_timeout < usec)
1056 err = sd_event_add_monotonic(client->event, next_timeout,
1058 client_timeout_t1, client,
1059 &client->timeout_t1);
1063 if (!client->lease->t2)
1064 client->lease->t2 = client->lease->lifetime * 7 / 8;
1066 if (client->lease->t2 < client->lease->t1)
1069 if (client->lease->lifetime < client->lease->t2)
1072 next_timeout = client_compute_timeout(client->request_sent,
1074 if (next_timeout < usec)
1077 err = sd_event_add_monotonic(client->event, next_timeout,
1079 client_timeout_t2, client,
1080 &client->timeout_t2);
1084 next_timeout = client_compute_timeout(client->request_sent,
1085 client->lease->lifetime);
1086 if (next_timeout < usec)
1089 err = sd_event_add_monotonic(client->event, next_timeout,
1091 client_timeout_expire, client,
1092 &client->timeout_expire);
1099 static int client_receive_message(sd_event_source *s, int fd,
1100 uint32_t revents, void *userdata)
1102 sd_dhcp_client *client = userdata;
1103 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1104 int buflen = sizeof(buf);
1105 int len, r = 0, notify_event = 0;
1106 DHCPPacket *message;
1109 len = read(fd, &buf, buflen);
1113 r = sd_event_get_now_monotonic(client->event, &time_now);
1117 switch (client->state) {
1118 case DHCP_STATE_SELECTING:
1120 message = (DHCPPacket *)&buf;
1122 if (client_receive_offer(client, message, len) >= 0) {
1124 client->timeout_resend =
1125 sd_event_source_unref(client->timeout_resend);
1127 client->state = DHCP_STATE_REQUESTING;
1128 client->attempt = 1;
1130 r = sd_event_add_monotonic(client->event, time_now, 0,
1131 client_timeout_resend,
1133 &client->timeout_resend);
1140 case DHCP_STATE_REQUESTING:
1141 case DHCP_STATE_RENEWING:
1142 case DHCP_STATE_REBINDING:
1144 r = client_receive_ack(client, buf, len);
1146 if (r == DHCP_EVENT_NO_LEASE)
1150 client->timeout_resend =
1151 sd_event_source_unref(client->timeout_resend);
1153 if (client->state == DHCP_STATE_REQUESTING)
1154 notify_event = DHCP_EVENT_IP_ACQUIRE;
1155 else if (r != DHCP_EVENT_IP_ACQUIRE)
1158 client->state = DHCP_STATE_BOUND;
1159 client->attempt = 1;
1161 client->last_addr = client->lease->address;
1163 r = client_set_lease_timeouts(client, time_now);
1168 client_notify(client, notify_event);
1170 client->receive_message =
1171 sd_event_source_unref(client->receive_message);
1180 case DHCP_STATE_INIT:
1181 case DHCP_STATE_INIT_REBOOT:
1182 case DHCP_STATE_REBOOTING:
1183 case DHCP_STATE_BOUND:
1189 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1190 return client_stop(client, r);
1195 int sd_dhcp_client_start(sd_dhcp_client *client)
1199 assert_return(client, -EINVAL);
1200 assert_return(client->index > 0, -EINVAL);
1201 assert_return(client->state == DHCP_STATE_INIT ||
1202 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1204 client->xid = random_u32();
1206 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1209 client_stop(client, r);
1214 client->start_time = now(CLOCK_MONOTONIC);
1216 return client_initialize_events(client, client->start_time);
1219 int sd_dhcp_client_stop(sd_dhcp_client *client)
1221 return client_stop(client, DHCP_EVENT_STOP);
1224 sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client)
1226 assert_return(client, NULL);
1228 sd_dhcp_client_stop(client);
1230 sd_event_unref(client->event);
1231 free(client->req_opts);
1237 sd_dhcp_client *sd_dhcp_client_new(sd_event *event)
1239 sd_dhcp_client *client;
1241 assert_return(event, NULL);
1243 client = new0(sd_dhcp_client, 1);
1247 client->event = sd_event_ref(event);
1248 client->state = DHCP_STATE_INIT;
1251 client->attempt = 1;
1253 client->req_opts_size = ELEMENTSOF(default_req_opts);
1255 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1256 if (!client->req_opts) {