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;
51 typedef struct DHCPLease DHCPLease;
53 struct sd_dhcp_client {
57 sd_event_source *timeout_resend;
60 union sockaddr_union link;
61 sd_event_source *receive_message;
63 size_t req_opts_allocated;
66 struct ether_addr mac_addr;
71 sd_event_source *timeout_t1;
72 sd_event_source *timeout_t2;
73 sd_event_source *timeout_expire;
74 sd_dhcp_client_cb_t cb;
79 static const uint8_t default_req_opts[] = {
80 DHCP_OPTION_SUBNET_MASK,
82 DHCP_OPTION_HOST_NAME,
83 DHCP_OPTION_DOMAIN_NAME,
84 DHCP_OPTION_DOMAIN_NAME_SERVER,
85 DHCP_OPTION_NTP_SERVER,
88 static int client_receive_message(sd_event_source *s, int fd,
89 uint32_t revents, void *userdata);
91 int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
93 assert_return(client, -EINVAL);
96 client->userdata = userdata;
101 int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
104 assert_return(client, -EINVAL);
105 assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
108 case DHCP_OPTION_PAD:
109 case DHCP_OPTION_OVERLOAD:
110 case DHCP_OPTION_MESSAGE_TYPE:
111 case DHCP_OPTION_PARAMETER_REQUEST_LIST:
112 case DHCP_OPTION_END:
119 for (i = 0; i < client->req_opts_size; i++)
120 if (client->req_opts[i] == option)
123 if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
124 client->req_opts_size + 1))
127 client->req_opts[client->req_opts_size++] = option;
132 int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
133 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) {
146 assert_return(client, -EINVAL);
147 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
148 assert_return(interface_index >= -1, -EINVAL);
150 client->index = interface_index;
155 int sd_dhcp_client_set_mac(sd_dhcp_client *client,
156 const struct ether_addr *addr) {
157 assert_return(client, -EINVAL);
158 assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
160 memcpy(&client->mac_addr, addr, ETH_ALEN);
165 int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr) {
166 assert_return(client, -EINVAL);
167 assert_return(addr, -EINVAL);
169 switch (client->state) {
170 case DHCP_STATE_INIT:
171 case DHCP_STATE_SELECTING:
172 case DHCP_STATE_INIT_REBOOT:
173 case DHCP_STATE_REBOOTING:
174 case DHCP_STATE_REQUESTING:
175 return -EADDRNOTAVAIL;
177 case DHCP_STATE_BOUND:
178 case DHCP_STATE_RENEWING:
179 case DHCP_STATE_REBINDING:
180 addr->s_addr = client->lease->address;
188 int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu) {
189 assert_return(client, -EINVAL);
190 assert_return(mtu, -EINVAL);
192 switch (client->state) {
193 case DHCP_STATE_INIT:
194 case DHCP_STATE_SELECTING:
195 case DHCP_STATE_INIT_REBOOT:
196 case DHCP_STATE_REBOOTING:
197 case DHCP_STATE_REQUESTING:
198 return -EADDRNOTAVAIL;
200 case DHCP_STATE_BOUND:
201 case DHCP_STATE_RENEWING:
202 case DHCP_STATE_REBINDING:
203 if (client->lease->mtu)
204 *mtu = client->lease->mtu;
214 int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr **addr, size_t *addr_size) {
215 assert_return(client, -EINVAL);
216 assert_return(addr, -EINVAL);
217 assert_return(addr_size, -EINVAL);
219 switch (client->state) {
220 case DHCP_STATE_INIT:
221 case DHCP_STATE_SELECTING:
222 case DHCP_STATE_INIT_REBOOT:
223 case DHCP_STATE_REBOOTING:
224 case DHCP_STATE_REQUESTING:
225 return -EADDRNOTAVAIL;
227 case DHCP_STATE_BOUND:
228 case DHCP_STATE_RENEWING:
229 case DHCP_STATE_REBINDING:
230 if (client->lease->dns_size) {
231 *addr_size = client->lease->dns_size;
232 *addr = client->lease->dns;
242 int sd_dhcp_client_get_domainname(sd_dhcp_client *client, const char **domainname) {
243 assert_return(client, -EINVAL);
244 assert_return(domainname, -EINVAL);
246 switch (client->state) {
247 case DHCP_STATE_INIT:
248 case DHCP_STATE_SELECTING:
249 case DHCP_STATE_INIT_REBOOT:
250 case DHCP_STATE_REBOOTING:
251 case DHCP_STATE_REQUESTING:
252 return -EADDRNOTAVAIL;
254 case DHCP_STATE_BOUND:
255 case DHCP_STATE_RENEWING:
256 case DHCP_STATE_REBINDING:
257 if (client->lease->domainname)
258 *domainname = client->lease->domainname;
268 int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname) {
269 assert_return(client, -EINVAL);
270 assert_return(hostname, -EINVAL);
272 switch (client->state) {
273 case DHCP_STATE_INIT:
274 case DHCP_STATE_SELECTING:
275 case DHCP_STATE_INIT_REBOOT:
276 case DHCP_STATE_REBOOTING:
277 case DHCP_STATE_REQUESTING:
278 return -EADDRNOTAVAIL;
280 case DHCP_STATE_BOUND:
281 case DHCP_STATE_RENEWING:
282 case DHCP_STATE_REBINDING:
283 if (client->lease->hostname)
284 *hostname = client->lease->hostname;
294 int sd_dhcp_client_prefixlen(const struct in_addr *addr) {
298 assert_return(addr, -EADDRNOTAVAIL);
300 mask = be32toh(addr->s_addr);
309 int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr) {
310 assert_return(client, -EINVAL);
311 assert_return(addr, -EINVAL);
313 switch (client->state) {
314 case DHCP_STATE_INIT:
315 case DHCP_STATE_SELECTING:
316 case DHCP_STATE_INIT_REBOOT:
317 case DHCP_STATE_REBOOTING:
318 case DHCP_STATE_REQUESTING:
319 return -EADDRNOTAVAIL;
321 case DHCP_STATE_BOUND:
322 case DHCP_STATE_RENEWING:
323 case DHCP_STATE_REBINDING:
324 addr->s_addr = client->lease->router;
332 int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr) {
333 assert_return(client, -EINVAL);
334 assert_return(addr, -EINVAL);
336 switch (client->state) {
337 case DHCP_STATE_INIT:
338 case DHCP_STATE_SELECTING:
339 case DHCP_STATE_INIT_REBOOT:
340 case DHCP_STATE_REBOOTING:
341 case DHCP_STATE_REQUESTING:
342 return -EADDRNOTAVAIL;
344 case DHCP_STATE_BOUND:
345 case DHCP_STATE_RENEWING:
346 case DHCP_STATE_REBINDING:
347 addr->s_addr = client->lease->subnet_mask;
355 static int client_notify(sd_dhcp_client *client, int event) {
357 client->cb(client, event, client->userdata);
362 static void lease_free(DHCPLease *lease) {
366 free(lease->hostname);
367 free(lease->domainname);
372 DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPLease*, lease_free);
373 #define _cleanup_lease_free_ _cleanup_(lease_freep)
375 static int client_stop(sd_dhcp_client *client, int error) {
376 assert_return(client, -EINVAL);
378 client->receive_message =
379 sd_event_source_unref(client->receive_message);
385 client->timeout_resend = sd_event_source_unref(client->timeout_resend);
387 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
388 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
389 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
393 client_notify(client, error);
395 switch (client->state) {
397 case DHCP_STATE_INIT:
398 case DHCP_STATE_SELECTING:
399 case DHCP_STATE_REQUESTING:
400 case DHCP_STATE_BOUND:
402 client->start_time = 0;
403 client->state = DHCP_STATE_INIT;
406 case DHCP_STATE_INIT_REBOOT:
407 case DHCP_STATE_REBOOTING:
408 case DHCP_STATE_RENEWING:
409 case DHCP_STATE_REBINDING:
415 lease_free(client->lease);
416 client->lease = NULL;
422 static int client_packet_init(sd_dhcp_client *client, uint8_t type,
423 DHCPMessage *message, uint16_t secs,
424 uint8_t **opt, size_t *optlen) {
428 *opt = (uint8_t *)(message + 1);
434 message->op = BOOTREQUEST;
436 message->hlen = ETHER_ADDR_LEN;
437 message->xid = htobe32(client->xid);
439 /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
440 refuse to issue an DHCP lease if 'secs' is set to zero */
441 message->secs = htobe16(secs);
443 if (client->state == DHCP_STATE_RENEWING ||
444 client->state == DHCP_STATE_REBINDING)
445 message->ciaddr = client->lease->address;
447 memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
455 err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
460 /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
461 Identifier option is not set */
462 err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
463 ETH_ALEN, &client->mac_addr);
467 if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
468 err = dhcp_option_append(opt, optlen,
469 DHCP_OPTION_PARAMETER_REQUEST_LIST,
470 client->req_opts_size,
475 /* Some DHCP servers will send bigger DHCP packets than the
476 defined default size unless the Maximum Messge Size option
477 is explicitely set */
478 max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
479 DHCP_CLIENT_MIN_OPTIONS_SIZE);
480 err = dhcp_option_append(opt, optlen,
481 DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
490 static uint16_t client_checksum(void *buf, int len) {
499 for (i = 0; i < len / 2 ; i++)
508 sum = (sum & 0xffff) + (sum >> 16);
513 static void client_append_ip_headers(DHCPPacket *packet, uint16_t len) {
514 packet->ip.version = IPVERSION;
515 packet->ip.ihl = DHCP_IP_SIZE / 4;
516 packet->ip.tot_len = htobe16(len);
518 packet->ip.protocol = IPPROTO_UDP;
519 packet->ip.saddr = INADDR_ANY;
520 packet->ip.daddr = INADDR_BROADCAST;
522 packet->udp.source = htobe16(DHCP_PORT_CLIENT);
523 packet->udp.dest = htobe16(DHCP_PORT_SERVER);
524 packet->udp.len = htobe16(len - DHCP_IP_SIZE);
526 packet->ip.check = packet->udp.len;
527 packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
529 packet->ip.ttl = IPDEFTTL;
530 packet->ip.check = 0;
531 packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
534 static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
536 _cleanup_free_ DHCPPacket *discover;
540 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
541 len = sizeof(DHCPPacket) + optlen;
543 discover = malloc0(len);
548 err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
549 secs, &opt, &optlen);
553 if (client->last_addr != INADDR_ANY) {
554 err = dhcp_option_append(&opt, &optlen,
555 DHCP_OPTION_REQUESTED_IP_ADDRESS,
556 4, &client->last_addr);
561 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
565 client_append_ip_headers(discover, len);
567 err = dhcp_network_send_raw_socket(client->fd, &client->link,
573 static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
574 _cleanup_free_ DHCPPacket *request;
579 optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
580 len = DHCP_MESSAGE_SIZE + optlen;
582 request = malloc0(len);
586 err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
591 if (client->state == DHCP_STATE_REQUESTING) {
592 err = dhcp_option_append(&opt, &optlen,
593 DHCP_OPTION_REQUESTED_IP_ADDRESS,
594 4, &client->lease->address);
598 err = dhcp_option_append(&opt, &optlen,
599 DHCP_OPTION_SERVER_IDENTIFIER,
600 4, &client->lease->server_address);
605 err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
609 if (client->state == DHCP_STATE_RENEWING) {
610 err = dhcp_network_send_udp_socket(client->fd,
611 client->lease->server_address,
613 len - DHCP_IP_UDP_SIZE);
615 client_append_ip_headers(request, len);
617 err = dhcp_network_send_raw_socket(client->fd, &client->link,
624 static int client_timeout_resend(sd_event_source *s, uint64_t usec,
626 sd_dhcp_client *client = userdata;
627 usec_t next_timeout = 0;
634 assert(client->event);
636 switch (client->state) {
637 case DHCP_STATE_RENEWING:
639 time_left = (client->lease->t2 - client->lease->t1)/2;
643 next_timeout = usec + time_left * USEC_PER_SEC;
647 case DHCP_STATE_REBINDING:
649 time_left = (client->lease->lifetime - client->lease->t2)/2;
653 next_timeout = usec + time_left * USEC_PER_SEC;
656 case DHCP_STATE_INIT:
657 case DHCP_STATE_INIT_REBOOT:
658 case DHCP_STATE_REBOOTING:
659 case DHCP_STATE_SELECTING:
660 case DHCP_STATE_REQUESTING:
661 case DHCP_STATE_BOUND:
663 if (client->attempt < 64)
664 client->attempt *= 2;
666 next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
671 next_timeout += (random_u32() & 0x1fffff);
673 r = sd_event_add_monotonic(client->event, next_timeout,
675 client_timeout_resend, client,
676 &client->timeout_resend);
680 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
684 secs = (usec - client->start_time) / USEC_PER_SEC;
686 switch (client->state) {
687 case DHCP_STATE_INIT:
688 r = client_send_discover(client, secs);
690 client->state = DHCP_STATE_SELECTING;
693 if (client->attempt >= 64)
699 case DHCP_STATE_SELECTING:
700 r = client_send_discover(client, secs);
701 if (r < 0 && client->attempt >= 64)
706 case DHCP_STATE_REQUESTING:
707 case DHCP_STATE_RENEWING:
708 case DHCP_STATE_REBINDING:
709 r = client_send_request(client, secs);
710 if (r < 0 && client->attempt >= 64)
713 client->request_sent = usec;
717 case DHCP_STATE_INIT_REBOOT:
718 case DHCP_STATE_REBOOTING:
719 case DHCP_STATE_BOUND:
727 client_stop(client, r);
729 /* Errors were dealt with when stopping the client, don't spill
730 errors into the event loop handler */
734 static int client_initialize_events(sd_dhcp_client *client, usec_t usec) {
738 assert(client->event);
740 r = sd_event_add_io(client->event, client->fd, EPOLLIN,
741 client_receive_message, client,
742 &client->receive_message);
746 r = sd_event_source_set_priority(client->receive_message, client->event_priority);
750 r = sd_event_add_monotonic(client->event, usec, 0,
751 client_timeout_resend, client,
752 &client->timeout_resend);
756 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
760 client_stop(client, r);
766 static int client_timeout_expire(sd_event_source *s, uint64_t usec,
768 sd_dhcp_client *client = userdata;
770 client_stop(client, DHCP_EVENT_EXPIRED);
775 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
776 sd_dhcp_client *client = userdata;
779 if (client->fd >= 0) {
780 client->receive_message =
781 sd_event_source_unref(client->receive_message);
786 client->state = DHCP_STATE_REBINDING;
789 r = dhcp_network_bind_raw_socket(client->index, &client->link);
791 client_stop(client, r);
797 return client_initialize_events(client, usec);
800 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
801 sd_dhcp_client *client = userdata;
804 client->state = DHCP_STATE_RENEWING;
807 r = dhcp_network_bind_udp_socket(client->index,
808 client->lease->address);
810 client_stop(client, r);
816 return client_initialize_events(client, usec);
819 static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
821 DHCPLease *lease = user_data;
826 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
828 memcpy(&val, option, 4);
829 lease->lifetime = be32toh(val);
834 case DHCP_OPTION_SERVER_IDENTIFIER:
836 memcpy(&lease->server_address, option, 4);
840 case DHCP_OPTION_SUBNET_MASK:
842 memcpy(&lease->subnet_mask, option, 4);
846 case DHCP_OPTION_ROUTER:
848 memcpy(&lease->router, option, 4);
852 case DHCP_OPTION_DOMAIN_NAME_SERVER:
856 lease->dns_size = len / 4;
859 lease->dns = new0(struct in_addr, lease->dns_size);
863 for (i = 0; i < lease->dns_size; i++) {
864 memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
870 case DHCP_OPTION_INTERFACE_MTU:
874 memcpy(&mtu, option, 2);
875 lease->mtu = be16toh(mtu);
883 case DHCP_OPTION_DOMAIN_NAME:
885 free(lease->domainname);
886 lease->domainname = strndup((const char *)option, len);
891 case DHCP_OPTION_HOST_NAME:
893 free(lease->hostname);
894 lease->hostname = strndup((const char *)option, len);
899 case DHCP_OPTION_RENEWAL_T1_TIME:
901 memcpy(&val, option, 4);
902 lease->t1 = be32toh(val);
907 case DHCP_OPTION_REBINDING_T2_TIME:
909 memcpy(&val, option, 4);
910 lease->t2 = be32toh(val);
919 static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
923 if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
926 hdrlen = message->ip.ihl * 4;
927 if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
931 message->ip.check = message->udp.len;
934 if (hdrlen + be16toh(message->udp.len) > len ||
935 client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
938 if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
939 be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
942 if (message->dhcp.op != BOOTREPLY)
945 if (be32toh(message->dhcp.xid) != client->xid)
948 if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
955 static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
957 _cleanup_lease_free_ DHCPLease *lease = NULL;
960 r = client_verify_headers(client, offer, len);
964 lease = new0(DHCPLease, 1);
968 len = len - DHCP_IP_UDP_SIZE;
969 r = dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
974 lease->address = offer->dhcp.yiaddr;
976 if (lease->address == INADDR_ANY ||
977 lease->server_address == INADDR_ANY ||
978 lease->subnet_mask == INADDR_ANY ||
979 lease->lifetime == 0)
982 client->lease = lease;
988 static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
992 _cleanup_lease_free_ DHCPLease *lease = NULL;
995 if (client->state == DHCP_STATE_RENEWING) {
996 dhcp = (DHCPMessage *)buf;
998 ack = (DHCPPacket *)buf;
1000 r = client_verify_headers(client, ack, len);
1005 len -= DHCP_IP_UDP_SIZE;
1008 lease = new0(DHCPLease, 1);
1012 r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
1014 return DHCP_EVENT_NO_LEASE;
1019 lease->address = dhcp->yiaddr;
1021 if (lease->address == INADDR_ANY ||
1022 lease->server_address == INADDR_ANY ||
1023 lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
1026 r = DHCP_EVENT_IP_ACQUIRE;
1027 if (client->lease) {
1028 if (client->lease->address != lease->address ||
1029 client->lease->subnet_mask != lease->subnet_mask ||
1030 client->lease->router != lease->router) {
1031 r = DHCP_EVENT_IP_CHANGE;
1034 lease_free(client->lease);
1037 client->lease = lease;
1043 static uint64_t client_compute_timeout(uint64_t request_sent,
1044 uint32_t lifetime) {
1045 return request_sent + (lifetime - 3) * USEC_PER_SEC +
1046 + (random_u32() & 0x1fffff);
1049 static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) {
1050 uint64_t next_timeout;
1054 assert(client->event);
1056 if (client->lease->lifetime < 10)
1059 client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
1060 client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
1061 client->timeout_expire = sd_event_source_unref(client->timeout_expire);
1063 if (!client->lease->t1)
1064 client->lease->t1 = client->lease->lifetime / 2;
1066 next_timeout = client_compute_timeout(client->request_sent,
1068 if (next_timeout < usec)
1071 r = sd_event_add_monotonic(client->event, next_timeout,
1073 client_timeout_t1, client,
1074 &client->timeout_t1);
1078 r = sd_event_source_set_priority(client->timeout_t1, client->event_priority);
1082 if (!client->lease->t2)
1083 client->lease->t2 = client->lease->lifetime * 7 / 8;
1085 if (client->lease->t2 < client->lease->t1)
1088 if (client->lease->lifetime < client->lease->t2)
1091 next_timeout = client_compute_timeout(client->request_sent,
1093 if (next_timeout < usec)
1096 r = sd_event_add_monotonic(client->event, next_timeout,
1098 client_timeout_t2, client,
1099 &client->timeout_t2);
1103 r = sd_event_source_set_priority(client->timeout_t2, client->event_priority);
1107 next_timeout = client_compute_timeout(client->request_sent,
1108 client->lease->lifetime);
1109 if (next_timeout < usec)
1112 r = sd_event_add_monotonic(client->event, next_timeout,
1114 client_timeout_expire, client,
1115 &client->timeout_expire);
1119 r = sd_event_source_set_priority(client->timeout_expire, client->event_priority);
1126 static int client_receive_message(sd_event_source *s, int fd,
1127 uint32_t revents, void *userdata) {
1128 sd_dhcp_client *client = userdata;
1129 uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
1130 int buflen = sizeof(buf);
1131 int len, r = 0, notify_event = 0;
1132 DHCPPacket *message;
1137 assert(client->event);
1139 len = read(fd, &buf, buflen);
1143 r = sd_event_get_now_monotonic(client->event, &time_now);
1147 switch (client->state) {
1148 case DHCP_STATE_SELECTING:
1150 message = (DHCPPacket *)&buf;
1152 if (client_receive_offer(client, message, len) >= 0) {
1154 client->timeout_resend =
1155 sd_event_source_unref(client->timeout_resend);
1157 client->state = DHCP_STATE_REQUESTING;
1158 client->attempt = 1;
1160 r = sd_event_add_monotonic(client->event, time_now, 0,
1161 client_timeout_resend,
1163 &client->timeout_resend);
1167 r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
1174 case DHCP_STATE_REQUESTING:
1175 case DHCP_STATE_RENEWING:
1176 case DHCP_STATE_REBINDING:
1178 r = client_receive_ack(client, buf, len);
1180 if (r == DHCP_EVENT_NO_LEASE)
1184 client->timeout_resend =
1185 sd_event_source_unref(client->timeout_resend);
1187 if (client->state == DHCP_STATE_REQUESTING)
1188 notify_event = DHCP_EVENT_IP_ACQUIRE;
1189 else if (r != DHCP_EVENT_IP_ACQUIRE)
1192 client->state = DHCP_STATE_BOUND;
1193 client->attempt = 1;
1195 client->last_addr = client->lease->address;
1197 r = client_set_lease_timeouts(client, time_now);
1202 client_notify(client, notify_event);
1204 client->receive_message =
1205 sd_event_source_unref(client->receive_message);
1214 case DHCP_STATE_INIT:
1215 case DHCP_STATE_INIT_REBOOT:
1216 case DHCP_STATE_REBOOTING:
1217 case DHCP_STATE_BOUND:
1223 if (r < 0 || r == DHCP_EVENT_NO_LEASE)
1224 return client_stop(client, r);
1229 int sd_dhcp_client_start(sd_dhcp_client *client) {
1232 assert_return(client, -EINVAL);
1233 assert_return(client->event, -EINVAL);
1234 assert_return(client->index > 0, -EINVAL);
1235 assert_return(client->state == DHCP_STATE_INIT ||
1236 client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
1238 client->xid = random_u32();
1240 r = dhcp_network_bind_raw_socket(client->index, &client->link);
1243 client_stop(client, r);
1248 client->start_time = now(CLOCK_MONOTONIC);
1250 return client_initialize_events(client, client->start_time);
1253 int sd_dhcp_client_stop(sd_dhcp_client *client) {
1254 return client_stop(client, DHCP_EVENT_STOP);
1257 int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int priority) {
1260 assert_return(client, -EINVAL);
1261 assert_return(!client->event, -EBUSY);
1264 client->event = sd_event_ref(event);
1266 r = sd_event_default(&client->event);
1271 client->event_priority = priority;
1276 int sd_dhcp_client_detach_event(sd_dhcp_client *client) {
1277 assert_return(client, -EINVAL);
1279 client->event = sd_event_unref(client->event);
1284 sd_event *sd_dhcp_client_get_event(sd_dhcp_client *client) {
1288 return client->event;
1291 void sd_dhcp_client_free(sd_dhcp_client *client) {
1295 sd_dhcp_client_stop(client);
1296 sd_dhcp_client_detach_event(client);
1298 free(client->req_opts);
1302 DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_client*, sd_dhcp_client_free);
1303 #define _cleanup_dhcp_client_free_ _cleanup_(sd_dhcp_client_freep)
1305 int sd_dhcp_client_new(sd_dhcp_client **ret) {
1306 _cleanup_dhcp_client_free_ sd_dhcp_client *client = NULL;
1308 assert_return(ret, -EINVAL);
1310 client = new0(sd_dhcp_client, 1);
1314 client->state = DHCP_STATE_INIT;
1317 client->attempt = 1;
1319 client->req_opts_size = ELEMENTSOF(default_req_opts);
1321 client->req_opts = memdup(default_req_opts, client->req_opts_size);
1322 if (!client->req_opts)