1 /* $OpenBSD: src/sbin/dhclient/dhclient.c,v 1.157 2012/10/10 17:44:43 krw Exp $ */
4 * Copyright 2004 Henning Brauer <henning@openbsd.org>
5 * Copyright (c) 1995, 1996, 1997, 1998, 1999
6 * The Internet Software Consortium. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of The Internet Software Consortium nor the names
18 * of its contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
22 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
23 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
26 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
30 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * This software has been written for the Internet Software Consortium
36 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
37 * Enterprises. To learn more about the Internet Software Consortium,
38 * see ``http://www.vix.com/isc''. To learn more about Vixie
39 * Enterprises, see ``http://www.vix.com''.
41 * This client was substantially modified and enhanced by Elliot Poger
42 * for use on Linux while he was working on the MosquitoNet project at
45 * The current version owes much to Elliot's Linux enhancements, but
46 * was substantially reorganized and partially rewritten by Ted Lemon
47 * so as to use the same networking framework that the Internet Software
48 * Consortium DHCP server uses. Much system-specific configuration code
49 * was moved into a shell script so that as support for more operating
50 * systems is added, it will not be necessary to port and maintain
51 * system-specific configuration code to these operating systems - instead,
52 * the shell script can invoke the native tools to accomplish the same
55 #include <sys/ioctl.h>
65 #define CLIENT_PATH "PATH=/usr/bin:/usr/sbin:/bin:/sbin"
66 #define DEFAULT_LEASE_TIME 43200 /* 12 hours... */
67 #define TIME_MAX 2147483647
68 #define POLL_FAILURES 10
69 #define POLL_FAILURE_WAIT 1 /* Back off multiplier (seconds) */
71 char *path_dhclient_conf = _PATH_DHCLIENT_CONF;
72 char *path_dhclient_db = NULL;
81 struct iaddr iaddr_broadcast = { 4, { 255, 255, 255, 255 } };
82 struct in_addr inaddr_any;
83 struct sockaddr_in sockaddr_broadcast;
85 struct interface_info *ifi;
86 struct client_state *client;
87 struct client_config *config;
89 int findproto(char *, int);
90 struct sockaddr *get_ifa(char *, int);
92 int check_option(struct client_lease *l, int option);
93 int ipv4addrs(char * buf);
94 int res_hnok(const char *dn);
95 char *option_as_string(unsigned int code, unsigned char *data, int len);
96 int fork_privchld(int, int);
97 void get_ifname(char *, char *);
100 static FILE *leaseFile;
103 findproto(char *cp, int n)
110 for (i = 1; i; i <<= 1) {
112 sa = (struct sockaddr *)cp;
118 if (sa->sa_family == AF_INET)
120 if (sa->sa_family == AF_INET6)
133 get_ifa(char *cp, int n)
140 for (i = 1; i; i <<= 1)
142 sa = (struct sockaddr *)cp;
150 struct iaddr defaddr = { .len = 4 }; /* NULL is for silence warnings */
157 struct rt_msghdr *rtm;
158 struct if_msghdr *ifm;
159 struct ifa_msghdr *ifam;
160 struct if_announcemsghdr *ifan;
161 struct client_lease *l;
165 char *errmsg, buf[64];
168 n = read(routefd, &msg, sizeof(msg));
169 } while (n == -1 && errno == EINTR);
171 rtm = (struct rt_msghdr *)msg;
172 if (n < sizeof(rtm->rtm_msglen) || n < rtm->rtm_msglen ||
173 rtm->rtm_version != RTM_VERSION)
176 switch (rtm->rtm_type) {
178 ifam = (struct ifa_msghdr *)rtm;
179 if (ifam->ifam_index != ifi->index)
181 if (findproto((char *)(ifam + 1), ifam->ifam_addrs) != AF_INET)
183 sa = get_ifa((char *)(ifam + 1), ifam->ifam_addrs);
185 errmsg = "sa == NULL";
189 if ((a.len = sizeof(struct in_addr)) > sizeof(a.iabuf))
190 error("king bula sez: len mismatch");
191 memcpy(a.iabuf, &((struct sockaddr_in *)sa)->sin_addr, a.len);
192 if (addr_eq(a, defaddr))
195 /* state_panic() can try unexpired existing leases */
196 if (client->active && addr_eq(a, client->active->address))
198 for (l = client->leases; l != NULL; l = l->next)
199 if (addr_eq(a, l->address))
203 /* new addr is the one we set */
205 snprintf(buf, sizeof(buf), "%s: %s",
206 "new address not one we set", piaddr(a));
210 ifam = (struct ifa_msghdr *)rtm;
211 if (ifam->ifam_index != ifi->index)
213 if (findproto((char *)(ifam + 1), ifam->ifam_addrs) != AF_INET)
215 /* XXX check addrs like RTM_NEWADDR instead of this? */
216 if (scripttime == 0 || time(NULL) < scripttime + 10)
218 errmsg = "interface address deleted";
221 ifm = (struct if_msghdr *)rtm;
222 if (ifm->ifm_index != ifi->index)
224 if ((rtm->rtm_flags & RTF_UP) == 0) {
225 errmsg = "interface down";
230 LINK_STATE_IS_UP(ifm->ifm_data.ifi_link_state) ? 1 : 0;
231 if (linkstat != ifi->linkstat) {
233 debug("link state %s -> %s",
234 ifi->linkstat ? "up" : "down",
235 linkstat ? "up" : "down");
237 ifi->linkstat = interface_status(ifi->name);
239 client->state = S_REBOOTING;
245 ifan = (struct if_announcemsghdr *)rtm;
246 if (ifan->ifan_what == IFAN_DEPARTURE &&
247 ifan->ifan_index == ifi->index) {
248 errmsg = "interface departure";
260 error("routehandler: %s", errmsg);
264 main(int argc, char *argv[])
266 int ch, fd, quiet = 0, i = 0, pipe_fd[2];
269 /* Initially, log errors to stderr as well as to syslogd. */
270 openlog(getprogname(), LOG_PID | LOG_NDELAY, DHCPD_LOG_FACILITY);
271 setlogmask(LOG_UPTO(LOG_INFO));
273 while ((ch = getopt(argc, argv, "c:dl:qu")) != -1)
276 path_dhclient_conf = optarg;
282 path_dhclient_db = optarg;
300 ifi = calloc(1, sizeof(*ifi));
303 client = calloc(1, sizeof(*client));
305 error("client calloc");
306 config = calloc(1, sizeof(*config));
308 error("config calloc");
310 get_ifname(ifi->name, argv[0]);
311 if (path_dhclient_db == NULL && asprintf(&path_dhclient_db, "%s.%s",
312 _PATH_DHCLIENT_DB, ifi->name) == -1)
320 memset(&sockaddr_broadcast, 0, sizeof(sockaddr_broadcast));
321 sockaddr_broadcast.sin_family = AF_INET;
322 sockaddr_broadcast.sin_port = htons(REMOTE_PORT);
323 sockaddr_broadcast.sin_addr.s_addr = INADDR_BROADCAST;
324 sockaddr_broadcast.sin_len = sizeof(sockaddr_broadcast);
325 inaddr_any.s_addr = INADDR_ANY;
329 if (interface_status(ifi->name) == 0) {
330 interface_link_forceup(ifi->name);
331 /* Give it up to 4 seconds of silent grace to find link */
336 while (!(ifi->linkstat = interface_status(ifi->name))) {
338 fprintf(stderr, "%s: no link ...", ifi->name);
340 fprintf(stderr, ".");
342 if (++i > config->link_timeout) {
343 fprintf(stderr, " sleeping\n");
349 fprintf(stderr, " got link\n");
352 if ((nullfd = open(_PATH_DEVNULL, O_RDWR, 0)) == -1)
353 error("cannot open %s: %m", _PATH_DEVNULL);
355 if ((pw = getpwnam("_dhcp")) == NULL)
356 error("no such user: _dhcp");
358 if (pipe(pipe_fd) == -1)
361 fork_privchld(pipe_fd[0], pipe_fd[1]);
366 if ((fd = open(path_dhclient_db, O_RDONLY|O_EXLOCK|O_CREAT, 0)) == -1)
367 error("can't open and lock %s: %m", path_dhclient_db);
368 read_client_leases();
369 if ((leaseFile = fopen(path_dhclient_db, "w")) == NULL)
370 error("can't open %s: %m", path_dhclient_db);
371 rewrite_client_leases();
374 if ((routefd = socket(PF_ROUTE, SOCK_RAW, 0)) == -1)
375 error("socket(PF_ROUTE, SOCK_RAW): %m");
377 /* set up the interface */
378 discover_interface();
380 if (chroot(_PATH_VAREMPTY) == -1)
382 if (chdir("/") == -1)
383 error("chdir(\"/\")");
385 if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1)
387 if (setgroups(1, &pw->pw_gid) == -1)
389 if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
394 setproctitle("%s", ifi->name);
397 client->state = S_REBOOTING;
411 fprintf(stderr, "usage: %s [-dqu] [-c file] [-l file] interface\n",
419 * Each routine is called from the dhclient_state_machine() in one of
421 * -> entering INIT state
422 * -> recvpacket_flag == 0: timeout in this state
423 * -> otherwise: received a packet in this state
425 * Return conditions as handled by dhclient_state_machine():
426 * Returns 1, sendpacket_flag = 1: send packet, reset timer.
427 * Returns 1, sendpacket_flag = 0: just reset the timer (wait for a milestone).
428 * Returns 0: finish the nap which was interrupted for no good reason.
430 * Several per-interface variables are used to keep track of the process:
431 * active_lease: the lease that is being used on the interface
432 * (null pointer if not configured yet).
433 * offered_leases: leases corresponding to DHCPOFFER messages that have
434 * been sent to us by DHCP servers.
435 * acked_leases: leases corresponding to DHCPACK messages that have been
436 * sent to us by DHCP servers.
437 * sendpacket: DHCP packet we're trying to send.
438 * destination: IP address to send sendpacket to
439 * In addition, there are several relevant per-lease variables.
440 * T1_expiry, T2_expiry, lease_expiry: lease milestones
441 * In the active lease, these control the process of renewing the lease;
442 * In leases on the acked_leases list, this simply determines when we
443 * can no longer legitimately use the lease.
448 /* Cancel all timeouts, since a link state change gets us here
449 and can happen anytime. */
452 /* If we don't remember an active lease, go straight to INIT. */
453 if (!client->active || client->active->is_bootp) {
454 client->state = S_INIT;
459 /* make_request doesn't initialize xid because it normally comes
460 from the DHCPDISCOVER, but we haven't sent a DHCPDISCOVER,
461 so pick an xid now. */
462 client->xid = arc4random();
464 /* Make a DHCPREQUEST packet, and set appropriate per-interface
466 make_request(client->active);
467 client->destination = iaddr_broadcast;
468 client->first_sending = time(NULL);
469 client->interval = 0;
475 * Called when a lease has completely expired and we've
476 * been unable to renew it.
481 /* Make a DHCPDISCOVER packet, and set appropriate per-interface
483 make_discover(client->active);
484 client->xid = client->packet.xid;
485 client->destination = iaddr_broadcast;
486 client->state = S_SELECTING;
487 client->first_sending = time(NULL);
488 client->interval = 0;
494 * state_selecting is called when one or more DHCPOFFER packets
495 * have been received and a configurable period of time has passed.
498 state_selecting(void)
500 struct client_lease *lp, *next, *picked;
503 /* Cancel state_selecting and send_discover timeouts, since either
504 one could have got us here. */
507 /* We have received one or more DHCPOFFER packets. Currently,
508 the only criterion by which we judge leases is whether or
509 not we get a response when we arp for them. */
511 for (lp = client->offered_leases; lp; lp = next) {
519 free_client_lease(lp);
522 client->offered_leases = NULL;
524 /* If we just tossed all the leases we were offered, go back
527 client->state = S_INIT;
535 /* If it was a BOOTREPLY, we can just take the address right now. */
536 if (!picked->options[DHO_DHCP_MESSAGE_TYPE].len) {
537 client->new = picked;
539 /* Make up some lease expiry times
540 XXX these should be configurable. */
541 client->new->expiry = cur_time + 12000;
542 client->new->renewal += cur_time + 8000;
543 client->new->rebind += cur_time + 10000;
545 client->state = S_REQUESTING;
547 /* Bind to the address we received. */
552 /* Go to the REQUESTING state. */
553 client->destination = iaddr_broadcast;
554 client->state = S_REQUESTING;
555 client->first_sending = cur_time;
556 client->interval = 0;
558 /* Make a DHCPREQUEST packet from the lease we picked. */
559 make_request(picked);
560 client->xid = client->packet.xid;
562 /* Toss the lease we picked - we'll get it back in a DHCPACK. */
563 free_client_lease(picked);
569 dhcpack(struct iaddr client_addr, struct option_data *options)
571 struct client_lease *lease;
575 if (client->state != S_REBOOTING &&
576 client->state != S_REQUESTING &&
577 client->state != S_RENEWING &&
578 client->state != S_REBINDING)
582 lease = packet_to_lease(options);
584 note("packet_to_lease failed.");
590 /* Stop resending DHCPREQUEST. */
593 /* Figure out the lease time. */
594 if (client->new->options[DHO_DHCP_LEASE_TIME].data)
595 client->new->expiry =
596 getULong(client->new->options[DHO_DHCP_LEASE_TIME].data);
598 client->new->expiry = DEFAULT_LEASE_TIME;
599 /* A number that looks negative here is really just very large,
600 because the lease expiry offset is unsigned. */
601 if (client->new->expiry < 0)
602 client->new->expiry = TIME_MAX;
603 /* XXX should be fixed by resetting the client state */
604 if (client->new->expiry < 60)
605 client->new->expiry = 60;
607 /* Take the server-provided renewal time if there is one;
608 otherwise figure it out according to the spec. */
609 if (client->new->options[DHO_DHCP_RENEWAL_TIME].len)
610 client->new->renewal =
611 getULong(client->new->options[DHO_DHCP_RENEWAL_TIME].data);
613 client->new->renewal = client->new->expiry / 2;
615 /* Same deal with the rebind time. */
616 if (client->new->options[DHO_DHCP_REBINDING_TIME].len)
617 client->new->rebind =
618 getULong(client->new->options[DHO_DHCP_REBINDING_TIME].data);
620 client->new->rebind = client->new->renewal +
621 client->new->renewal / 2 + client->new->renewal / 4;
625 client->new->expiry += cur_time;
626 /* Lease lengths can never be negative. */
627 if (client->new->expiry < cur_time)
628 client->new->expiry = TIME_MAX;
629 client->new->renewal += cur_time;
630 if (client->new->renewal < cur_time)
631 client->new->renewal = TIME_MAX;
632 client->new->rebind += cur_time;
633 if (client->new->rebind < cur_time)
634 client->new->rebind = TIME_MAX;
642 /* Run the client script with the new parameters. */
643 script_init((client->state == S_REQUESTING ? "BOUND" :
644 (client->state == S_RENEWING ? "RENEW" :
645 (client->state == S_REBOOTING ? "REBOOT" : "REBIND"))));
646 if (client->active && client->state != S_REBOOTING)
647 script_write_params("old_", client->active);
648 script_write_params("new_", client->new);
651 /* Replace the old active lease with the new one. */
653 free_client_lease(client->active);
654 client->active = client->new;
657 /* Write out new leases file. */
658 rewrite_client_leases();
660 /* Set timeout to start the renewal process. */
661 set_timeout(client->active->renewal, state_bound);
663 note("bound to %s -- renewal in %lld seconds.",
664 piaddr(client->active->address),
665 (long long)(client->active->renewal - time(NULL)));
666 client->state = S_BOUND;
671 * state_bound is called when we've successfully bound to a particular
672 * lease, but the renewal time on that lease has expired. We are
673 * expected to unicast a DHCPREQUEST to the server that gave us our
679 /* T1 has expired. */
680 make_request(client->active);
681 client->xid = client->packet.xid;
683 if (client->active->options[DHO_DHCP_SERVER_IDENTIFIER].len == 4) {
684 memcpy(client->destination.iabuf,
685 client->active->options[DHO_DHCP_SERVER_IDENTIFIER].data,
687 client->destination.len = 4;
689 client->destination = iaddr_broadcast;
691 client->first_sending = time(NULL);
692 client->interval = 0;
693 client->state = S_RENEWING;
699 dhcpoffer(struct iaddr client_addr, struct option_data *options)
701 struct client_lease *lease, *lp;
703 time_t stop_selecting;
704 char *name = options[DHO_DHCP_MESSAGE_TYPE].len ? "DHCPOFFER" :
708 if (client->state != S_SELECTING)
712 /* If this lease doesn't supply the minimum required parameters,
714 for (i = 0; config->required_options[i]; i++) {
715 if (!options[config->required_options[i]].len) {
716 note("%s isn't satisfactory.", name);
721 /* If we've already seen this lease, don't record it again. */
722 for (lease = client->offered_leases;
723 lease; lease = lease->next) {
724 if (lease->address.len == sizeof(client->packet.yiaddr) &&
725 !memcmp(lease->address.iabuf,
726 &client->packet.yiaddr, lease->address.len)) {
728 debug("%s already seen.", name);
734 lease = packet_to_lease(options);
736 note("packet_to_lease failed.");
741 * Reject offers whose subnet is already configured on another
744 if (subnet_exists(lease))
747 /* If this lease was acquired through a BOOTREPLY, record that
749 if (!options[DHO_DHCP_MESSAGE_TYPE].len)
752 /* Figure out when we're supposed to stop selecting. */
753 stop_selecting = client->first_sending + config->select_interval;
755 /* If this is the lease we asked for, put it at the head of the
756 list, and don't mess with the arp request timeout. */
757 if (addr_eq(lease->address, client->requested_address)) {
758 lease->next = client->offered_leases;
759 client->offered_leases = lease;
761 /* Put the lease at the end of the list. */
763 if (!client->offered_leases)
764 client->offered_leases = lease;
766 for (lp = client->offered_leases; lp->next;
773 /* If the selecting interval has expired, go immediately to
774 state_selecting(). Otherwise, time out into
775 state_selecting at the select interval. */
776 if (stop_selecting <= time(NULL))
779 set_timeout(stop_selecting, state_selecting);
784 * Allocate a client_lease structure and initialize it from the
785 * parameters in the specified packet.
787 struct client_lease *
788 packet_to_lease(struct option_data *options)
790 struct client_lease *lease;
793 lease = malloc(sizeof(struct client_lease));
796 warning("dhcpoffer: no memory to record lease.");
800 memset(lease, 0, sizeof(*lease));
802 /* Copy the lease options. */
803 for (i = 0; i < 256; i++) {
804 if (options[i].len) {
805 lease->options[i] = options[i];
806 options[i].data = NULL;
808 if (!check_option(lease, i)) {
809 warning("Invalid lease option - ignoring offer");
810 free_client_lease(lease);
816 lease->address.len = sizeof(client->packet.yiaddr);
817 memcpy(lease->address.iabuf, &client->packet.yiaddr,
820 /* If the server name was filled out, copy it. */
821 if ((!lease->options[DHO_DHCP_OPTION_OVERLOAD].len ||
822 !(lease->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 2)) &&
823 client->packet.sname[0]) {
824 lease->server_name = malloc(DHCP_SNAME_LEN + 1);
825 if (!lease->server_name) {
826 warning("dhcpoffer: no memory for server name.");
827 free_client_lease(lease);
830 memcpy(lease->server_name, client->packet.sname,
832 lease->server_name[DHCP_SNAME_LEN] = '\0';
833 if (!res_hnok(lease->server_name)) {
834 warning("Bogus server name %s", lease->server_name);
835 free(lease->server_name);
836 lease->server_name = NULL;
840 /* Ditto for the filename. */
841 if ((!lease->options[DHO_DHCP_OPTION_OVERLOAD].len ||
842 !(lease->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 1)) &&
843 client->packet.file[0]) {
844 /* Don't count on the NUL terminator. */
845 lease->filename = malloc(DHCP_FILE_LEN + 1);
846 if (!lease->filename) {
847 warning("dhcpoffer: no memory for filename.");
848 free_client_lease(lease);
851 memcpy(lease->filename, client->packet.file, DHCP_FILE_LEN);
852 lease->filename[DHCP_FILE_LEN] = '\0';
858 dhcpnak(struct iaddr client_addr, struct option_data *options)
861 if (client->state != S_REBOOTING &&
862 client->state != S_REQUESTING &&
863 client->state != S_RENEWING &&
864 client->state != S_REBINDING)
868 if (!client->active) {
869 note("DHCPNAK with no active lease.");
873 free_client_lease(client->active);
874 client->active = NULL;
876 /* Stop sending DHCPREQUEST packets... */
879 client->state = S_INIT;
884 * Send out a DHCPDISCOVER packet, and set a timeout to send out another
885 * one after the right interval has expired. If we don't get an offer by
886 * the time we reach the panic interval, call the panic function.
892 int interval, increase = 1;
896 /* Figure out how long it's been since we started transmitting. */
897 interval = cur_time - client->first_sending;
899 /* If we're past the panic timeout, call the script and tell it
900 we haven't found anything for this interface yet. */
901 if (interval > config->timeout) {
907 * If we're supposed to increase the interval, do so. If it's
908 * currently zero (i.e., we haven't sent any packets yet), set
909 * it to initial_interval; otherwise, add to it a random
910 * number between zero and two times itself. On average, this
911 * means that it will double with every transmission.
914 if (!client->interval)
915 client->interval = config->initial_interval;
917 client->interval += (arc4random() >> 2) %
918 (2 * client->interval);
921 /* Don't backoff past cutoff. */
922 if (client->interval > config->backoff_cutoff)
923 client->interval = ((config->backoff_cutoff / 2)
924 + ((arc4random() >> 2) %
925 config->backoff_cutoff));
926 } else if (!client->interval)
927 client->interval = config->initial_interval;
929 /* If the backoff would take us to the panic timeout, just use that
931 if (cur_time + client->interval >
932 client->first_sending + config->timeout)
933 client->interval = (client->first_sending +
934 config->timeout) - cur_time + 1;
936 /* Record the number of seconds since we started sending. */
937 if (interval < 65536)
938 client->packet.secs = htons(interval);
940 client->packet.secs = htons(65535);
941 client->secs = client->packet.secs;
943 note("DHCPDISCOVER on %s to %s port %d interval %ld",
944 ifi->name, inet_ntoa(sockaddr_broadcast.sin_addr),
945 ntohs(sockaddr_broadcast.sin_port), client->interval);
947 send_packet(inaddr_any, &sockaddr_broadcast, NULL);
949 set_timeout_interval(client->interval, send_discover);
953 * state_panic gets called if we haven't received any offers in a preset
954 * amount of time. When this happens, we try to use existing leases
955 * that haven't yet expired, and failing that, we call the client script
956 * and hope it can do something.
961 struct client_lease *loop = client->active;
962 struct client_lease *lp;
965 note("No DHCPOFFERS received.");
967 /* We may not have an active lease, but we may have some
968 predefined leases that we can try. */
969 if (!client->active && client->leases)
972 /* Run through the list of leases and see if one can be used. */
974 while (client->active) {
975 if (client->active->expiry > cur_time) {
976 note("Trying recorded lease %s",
977 piaddr(client->active->address));
978 /* Run the client script with the existing
980 script_init("TIMEOUT");
981 script_write_params("new_", client->active);
983 /* If the old lease is still good and doesn't
984 yet need renewal, go into BOUND state and
985 timeout at the renewal time. */
987 if (cur_time < client->active->renewal) {
988 client->state = S_BOUND;
989 note("bound: renewal in %lld seconds.",
990 (long long)(client->active->renewal
992 set_timeout(client->active->renewal,
995 client->state = S_BOUND;
996 note("bound: immediate renewal.");
1004 /* If there are no other leases, give up. */
1005 if (!client->leases) {
1006 client->leases = client->active;
1007 client->active = NULL;
1012 /* Otherwise, put the active lease at the end of the
1013 lease list, and try another lease.. */
1014 for (lp = client->leases; lp->next; lp = lp->next)
1016 lp->next = client->active;
1018 lp->next->next = NULL;
1019 client->active = client->leases;
1020 client->leases = client->leases->next;
1022 /* If we already tried this lease, we've exhausted the
1023 set of leases, so we might as well give up for
1025 if (client->active == loop)
1028 loop = client->active;
1031 /* No leases were available, or what was available didn't work, so
1032 tell the shell script that we failed to allocate an address,
1033 and try again later. */
1034 note("No working leases in persistent database - sleeping.");
1035 script_init("FAIL");
1037 client->state = S_INIT;
1038 set_timeout_interval(config->retry_interval, state_init);
1045 struct sockaddr_in destination;
1046 struct in_addr from;
1052 /* Figure out how long it's been since we started transmitting. */
1053 interval = (int)(cur_time - client->first_sending);
1055 /* If we're in the INIT-REBOOT or REQUESTING state and we're
1056 past the reboot timeout, go to INIT and see if we can
1057 DISCOVER an address... */
1058 /* XXX In the INIT-REBOOT state, if we don't get an ACK, it
1059 means either that we're on a network with no DHCP server,
1060 or that our server is down. In the latter case, assuming
1061 that there is a backup DHCP server, DHCPDISCOVER will get
1062 us a new address, but we could also have successfully
1063 reused our old address. In the former case, we're hosed
1064 anyway. This is not a win-prone situation. */
1065 if ((client->state == S_REBOOTING ||
1066 client->state == S_REQUESTING) &&
1067 interval > config->reboot_timeout) {
1068 client->state = S_INIT;
1074 /* If the lease has expired, relinquish the address and go back
1075 to the INIT state. */
1076 if (client->state != S_REQUESTING &&
1077 cur_time > client->active->expiry) {
1078 /* Run the client script with the new parameters. */
1079 script_init("EXPIRE");
1080 script_write_params("old_", client->active);
1083 client->state = S_INIT;
1088 /* Do the exponential backoff... */
1089 if (!client->interval)
1090 client->interval = config->initial_interval;
1092 client->interval += ((arc4random() >> 2) %
1093 (2 * client->interval));
1095 /* Don't backoff past cutoff. */
1096 if (client->interval > config->backoff_cutoff)
1097 client->interval = ((config->backoff_cutoff / 2) +
1098 ((arc4random() >> 2) % client->interval));
1100 /* If the backoff would take us to the expiry time, just set the
1101 timeout to the expiry time. */
1102 if (client->state != S_REQUESTING && cur_time + client->interval >
1103 client->active->expiry)
1104 client->interval = client->active->expiry - cur_time + 1;
1106 /* If the lease T2 time has elapsed, or if we're not yet bound,
1107 broadcast the DHCPREQUEST rather than unicasting. */
1108 memset(&destination, 0, sizeof(destination));
1109 if (client->state == S_REQUESTING ||
1110 client->state == S_REBOOTING ||
1111 cur_time > client->active->rebind)
1112 destination.sin_addr.s_addr = INADDR_BROADCAST;
1114 memcpy(&destination.sin_addr.s_addr, client->destination.iabuf,
1115 sizeof(destination.sin_addr.s_addr));
1116 destination.sin_port = htons(REMOTE_PORT);
1117 destination.sin_family = AF_INET;
1118 destination.sin_len = sizeof(destination);
1120 if (client->state != S_REQUESTING)
1121 memcpy(&from, client->active->address.iabuf, sizeof(from));
1123 from.s_addr = INADDR_ANY;
1125 /* Record the number of seconds since we started sending. */
1126 if (client->state == S_REQUESTING)
1127 client->packet.secs = client->secs;
1129 if (interval < 65536)
1130 client->packet.secs = htons(interval);
1132 client->packet.secs = htons(65535);
1135 note("DHCPREQUEST on %s to %s port %d", ifi->name,
1136 inet_ntoa(destination.sin_addr), ntohs(destination.sin_port));
1138 send_packet(from, &destination, NULL);
1140 set_timeout_interval(client->interval, send_request);
1146 note("DHCPDECLINE on %s to %s port %d", ifi->name,
1147 inet_ntoa(sockaddr_broadcast.sin_addr),
1148 ntohs(sockaddr_broadcast.sin_port));
1150 send_packet(inaddr_any, &sockaddr_broadcast, NULL);
1154 make_discover(struct client_lease *lease)
1156 unsigned char discover = DHCPDISCOVER;
1157 struct option_data options[256];
1160 memset(options, 0, sizeof(options));
1161 memset(&client->packet, 0, sizeof(client->packet));
1163 /* Set DHCP_MESSAGE_TYPE to DHCPDISCOVER */
1164 i = DHO_DHCP_MESSAGE_TYPE;
1165 options[i].data = &discover;
1166 options[i].len = sizeof(discover);
1168 /* Request the options we want */
1169 i = DHO_DHCP_PARAMETER_REQUEST_LIST;
1170 options[i].data = config->requested_options;
1171 options[i].len = config->requested_option_count;
1173 /* If we had an address, try to get it again. */
1175 client->requested_address = lease->address;
1176 i = DHO_DHCP_REQUESTED_ADDRESS;
1177 options[i].data = lease->address.iabuf;
1178 options[i].len = lease->address.len;
1180 client->requested_address.len = 0;
1182 /* Send any options requested in the config file. */
1183 for (i = 0; i < 256; i++)
1184 if (!options[i].data &&
1185 config->send_options[i].data) {
1186 options[i].data = config->send_options[i].data;
1187 options[i].len = config->send_options[i].len;
1190 /* Set up the option buffer to fit in a minimal UDP packet. */
1191 i = cons_options(options);
1192 if (i == -1 || client->packet.options[i] != DHO_END)
1193 error("options do not fit in DHCPDISCOVER packet.");
1194 client->packet_length = DHCP_FIXED_NON_UDP+i+1;
1195 if (client->packet_length < BOOTP_MIN_LEN)
1196 client->packet_length = BOOTP_MIN_LEN;
1198 client->packet.op = BOOTREQUEST;
1199 client->packet.htype = ifi->hw_address.htype;
1200 client->packet.hlen = ifi->hw_address.hlen;
1201 client->packet.hops = 0;
1202 client->packet.xid = arc4random();
1203 client->packet.secs = 0; /* filled in by send_discover. */
1204 client->packet.flags = 0;
1206 memset(&client->packet.ciaddr, 0, sizeof(client->packet.ciaddr));
1207 memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr));
1208 memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr));
1209 memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr));
1210 memcpy(client->packet.chaddr, ifi->hw_address.haddr,
1211 ifi->hw_address.hlen);
1215 make_request(struct client_lease * lease)
1217 unsigned char request = DHCPREQUEST;
1218 struct option_data options[256];
1221 memset(options, 0, sizeof(options));
1222 memset(&client->packet, 0, sizeof(client->packet));
1224 /* Set DHCP_MESSAGE_TYPE to DHCPREQUEST */
1225 i = DHO_DHCP_MESSAGE_TYPE;
1226 options[i].data = &request;
1227 options[i].len = sizeof(request);
1229 /* Request the options we want */
1230 i = DHO_DHCP_PARAMETER_REQUEST_LIST;
1231 options[i].data = config->requested_options;
1232 options[i].len = config->requested_option_count;
1234 /* If we are requesting an address that hasn't yet been assigned
1235 to us, use the DHCP Requested Address option. */
1236 if (client->state == S_REQUESTING) {
1237 /* Send back the server identifier... */
1238 i = DHO_DHCP_SERVER_IDENTIFIER;
1239 options[i].data = lease->options[i].data;
1240 options[i].len = lease->options[i].len;
1242 if (client->state == S_REQUESTING ||
1243 client->state == S_REBOOTING) {
1244 client->requested_address = lease->address;
1245 i = DHO_DHCP_REQUESTED_ADDRESS;
1246 options[i].data = lease->address.iabuf;
1247 options[i].len = lease->address.len;
1249 client->requested_address.len = 0;
1251 /* Send any options requested in the config file. */
1252 for (i = 0; i < 256; i++)
1253 if (!options[i].data && config->send_options[i].data) {
1254 options[i].data = config->send_options[i].data;
1255 options[i].len = config->send_options[i].len;
1258 /* Set up the option buffer to fit in a minimal UDP packet. */
1259 i = cons_options(options);
1260 if (i == -1 || client->packet.options[i] != DHO_END)
1261 error("options do not fit in DHCPREQUEST packet.");
1262 client->packet_length = DHCP_FIXED_NON_UDP+i+1;
1263 if (client->packet_length < BOOTP_MIN_LEN)
1264 client->packet_length = BOOTP_MIN_LEN;
1266 client->packet.op = BOOTREQUEST;
1267 client->packet.htype = ifi->hw_address.htype;
1268 client->packet.hlen = ifi->hw_address.hlen;
1269 client->packet.hops = 0;
1270 client->packet.xid = client->xid;
1271 client->packet.secs = 0; /* Filled in by send_request. */
1272 client->packet.flags = 0;
1274 /* If we own the address we're requesting, put it in ciaddr;
1275 otherwise set ciaddr to zero. */
1276 if (client->state == S_BOUND ||
1277 client->state == S_RENEWING ||
1278 client->state == S_REBINDING) {
1279 memcpy(&client->packet.ciaddr,
1280 lease->address.iabuf, lease->address.len);
1282 memset(&client->packet.ciaddr, 0,
1283 sizeof(client->packet.ciaddr));
1286 memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr));
1287 memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr));
1288 memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr));
1289 memcpy(client->packet.chaddr, ifi->hw_address.haddr,
1290 ifi->hw_address.hlen);
1294 make_decline(struct client_lease *lease)
1296 struct option_data options[256];
1297 unsigned char decline = DHCPDECLINE;
1300 memset(options, 0, sizeof(options));
1301 memset(&client->packet, 0, sizeof(client->packet));
1303 /* Set DHCP_MESSAGE_TYPE to DHCPDECLINE */
1304 i = DHO_DHCP_MESSAGE_TYPE;
1305 options[i].data = &decline;
1306 options[i].len = sizeof(decline);
1308 /* Send back the server identifier... */
1309 i = DHO_DHCP_SERVER_IDENTIFIER;
1310 options[i].data = lease->options[i].data;
1311 options[i].len = lease->options[i].len;
1313 /* Send back the address we're declining. */
1314 i = DHO_DHCP_REQUESTED_ADDRESS;
1315 options[i].data = lease->address.iabuf;
1316 options[i].len = lease->address.len;
1318 /* Send the uid if the user supplied one. */
1319 i = DHO_DHCP_CLIENT_IDENTIFIER;
1320 if (config->send_options[i].len) {
1321 options[i].data = config->send_options[i].data;
1322 options[i].len = config->send_options[i].len;
1325 /* Set up the option buffer to fit in a minimal UDP packet. */
1326 i = cons_options(options);
1327 if (i == -1 || client->packet.options[i] != DHO_END)
1328 error("options do not fit in DHCPDECLINE packet.");
1329 client->packet_length = DHCP_FIXED_NON_UDP+i+1;
1330 if (client->packet_length < BOOTP_MIN_LEN)
1331 client->packet_length = BOOTP_MIN_LEN;
1333 client->packet.op = BOOTREQUEST;
1334 client->packet.htype = ifi->hw_address.htype;
1335 client->packet.hlen = ifi->hw_address.hlen;
1336 client->packet.hops = 0;
1337 client->packet.xid = client->xid;
1338 client->packet.secs = 0; /* Filled in by send_request. */
1339 client->packet.flags = 0;
1341 /* ciaddr must always be zero. */
1342 memset(&client->packet.ciaddr, 0, sizeof(client->packet.ciaddr));
1343 memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr));
1344 memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr));
1345 memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr));
1346 memcpy(client->packet.chaddr, ifi->hw_address.haddr,
1347 ifi->hw_address.hlen);
1351 free_client_lease(struct client_lease *lease)
1355 if (lease->server_name)
1356 free(lease->server_name);
1357 if (lease->filename)
1358 free(lease->filename);
1359 for (i = 0; i < 256; i++) {
1360 if (lease->options[i].len)
1361 free(lease->options[i].data);
1367 rewrite_client_leases(void)
1369 struct client_lease *lp;
1371 if (!leaseFile) /* XXX */
1372 error("lease file not open");
1377 for (lp = client->leases; lp; lp = lp->next) {
1378 if (client->active && addr_eq(lp->address,
1379 client->active->address))
1381 write_client_lease(lp);
1385 write_client_lease(client->active);
1388 ftruncate(fileno(leaseFile), ftello(leaseFile));
1389 fsync(fileno(leaseFile));
1393 write_client_lease(struct client_lease *lease)
1398 /* If the lease came from the config file, we don't need to stash
1399 a copy in the lease database. */
1400 if (lease->is_static)
1403 if (!leaseFile) /* XXX */
1404 error("lease file not open");
1406 fprintf(leaseFile, "lease {\n");
1407 if (lease->is_bootp)
1408 fprintf(leaseFile, " bootp;\n");
1409 fprintf(leaseFile, " interface \"%s\";\n", ifi->name);
1410 fprintf(leaseFile, " fixed-address %s;\n", piaddr(lease->address));
1411 if (lease->filename)
1412 fprintf(leaseFile, " filename \"%s\";\n", lease->filename);
1413 if (lease->server_name)
1414 fprintf(leaseFile, " server-name \"%s\";\n",
1415 lease->server_name);
1416 for (i = 0; i < 256; i++)
1417 if (lease->options[i].len)
1418 fprintf(leaseFile, " option %s %s;\n",
1419 dhcp_options[i].name,
1420 pretty_print_option(i, lease->options[i].data,
1421 lease->options[i].len, 1, 1));
1423 t = gmtime(&lease->renewal);
1424 fprintf(leaseFile, " renew %d %d/%d/%d %02d:%02d:%02d;\n",
1425 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
1426 t->tm_hour, t->tm_min, t->tm_sec);
1427 t = gmtime(&lease->rebind);
1428 fprintf(leaseFile, " rebind %d %d/%d/%d %02d:%02d:%02d;\n",
1429 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
1430 t->tm_hour, t->tm_min, t->tm_sec);
1431 t = gmtime(&lease->expiry);
1432 fprintf(leaseFile, " expire %d %d/%d/%d %02d:%02d:%02d;\n",
1433 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
1434 t->tm_hour, t->tm_min, t->tm_sec);
1435 fprintf(leaseFile, "}\n");
1440 script_init(char *reason)
1443 struct imsg_hdr hdr;
1446 hdr.code = IMSG_SCRIPT_INIT;
1447 hdr.len = sizeof(struct imsg_hdr) + sizeof(size_t) + strlen(reason);
1448 buf = buf_open(hdr.len);
1450 buf_add(buf, &hdr, sizeof(hdr));
1451 len = strlen(reason);
1452 buf_add(buf, &len, sizeof(len));
1453 buf_add(buf, reason, len);
1455 buf_close(privfd, buf);
1459 priv_script_init(char *reason)
1461 client->scriptEnvsize = 100;
1462 if (client->scriptEnv == NULL)
1464 calloc(client->scriptEnvsize, sizeof(char *));
1465 if (client->scriptEnv == NULL)
1466 error("script_init: no memory for environment");
1468 client->scriptEnv[0] = strdup(CLIENT_PATH);
1469 if (client->scriptEnv[0] == NULL)
1470 error("script_init: no memory for environment");
1472 client->scriptEnv[1] = NULL;
1474 script_set_env("", "interface", ifi->name);
1476 script_set_env("", "reason", reason);
1480 priv_script_write_params(char *prefix, struct client_lease *lease)
1482 u_int8_t dbuf[1500];
1486 script_set_env(prefix, "ip_address", piaddr(lease->address));
1488 if (lease->options[DHO_SUBNET_MASK].len &&
1489 (lease->options[DHO_SUBNET_MASK].len <
1490 sizeof(lease->address.iabuf))) {
1491 struct iaddr netmask, subnet, broadcast;
1493 memcpy(netmask.iabuf, lease->options[DHO_SUBNET_MASK].data,
1494 lease->options[DHO_SUBNET_MASK].len);
1495 netmask.len = lease->options[DHO_SUBNET_MASK].len;
1497 subnet = subnet_number(lease->address, netmask);
1499 script_set_env(prefix, "network_number",
1501 if (!lease->options[DHO_BROADCAST_ADDRESS].len) {
1502 broadcast = broadcast_addr(subnet, netmask);
1504 script_set_env(prefix,
1505 "broadcast_address",
1511 if (lease->filename)
1512 script_set_env(prefix, "filename", lease->filename);
1513 if (lease->server_name)
1514 script_set_env(prefix, "server_name",
1515 lease->server_name);
1516 for (i = 0; i < 256; i++) {
1517 u_int8_t *dp = NULL;
1519 if (config->defaults[i].len) {
1520 if (lease->options[i].len) {
1521 switch (config->default_actions[i]) {
1525 case ACTION_DEFAULT:
1526 dp = lease->options[i].data;
1527 len = lease->options[i].len;
1529 case ACTION_SUPERSEDE:
1531 dp = config->defaults[i].data;
1532 len = config->defaults[i].len;
1534 case ACTION_PREPEND:
1535 len = config->defaults[i].len +
1536 lease->options[i].len;
1537 if (len >= sizeof(dbuf)) {
1538 warning("no space to %s %s",
1540 dhcp_options[i].name);
1545 config->defaults[i].data,
1546 config->defaults[i].len);
1548 config->defaults[i].len,
1549 lease->options[i].data,
1550 lease->options[i].len);
1554 len = config->defaults[i].len +
1555 lease->options[i].len;
1556 if (len >= sizeof(dbuf)) {
1557 warning("no space to %s %s",
1559 dhcp_options[i].name);
1563 memcpy(dp, lease->options[i].data,
1564 lease->options[i].len);
1565 memcpy(dp + lease->options[i].len,
1566 config->defaults[i].data,
1567 config->defaults[i].len);
1571 dp = config->defaults[i].data;
1572 len = config->defaults[i].len;
1574 } else if (lease->options[i].len) {
1575 len = lease->options[i].len;
1576 dp = lease->options[i].data;
1580 if (len && config->default_actions[i] == ACTION_IGNORE) {
1586 if (dhcp_option_ev_name(name, sizeof(name),
1588 script_set_env(prefix, name,
1589 pretty_print_option(i, dp, len, 0, 0));
1592 snprintf(tbuf, sizeof(tbuf), "%d", (int)lease->expiry);
1593 script_set_env(prefix, "expiry", tbuf);
1597 script_write_params(char *prefix, struct client_lease *lease)
1599 size_t fn_len = 0, sn_len = 0, pr_len = 0;
1600 struct imsg_hdr hdr;
1604 if (lease->filename != NULL)
1605 fn_len = strlen(lease->filename);
1606 if (lease->server_name != NULL)
1607 sn_len = strlen(lease->server_name);
1609 pr_len = strlen(prefix);
1611 hdr.code = IMSG_SCRIPT_WRITE_PARAMS;
1612 hdr.len = sizeof(hdr) + sizeof(struct client_lease) +
1613 sizeof(size_t) + fn_len + sizeof(size_t) + sn_len +
1614 sizeof(size_t) + pr_len;
1616 for (i = 0; i < 256; i++)
1617 hdr.len += sizeof(int) + lease->options[i].len;
1619 scripttime = time(NULL);
1621 buf = buf_open(hdr.len);
1623 buf_add(buf, &hdr, sizeof(hdr));
1624 buf_add(buf, lease, sizeof(struct client_lease));
1625 buf_add(buf, &fn_len, sizeof(fn_len));
1626 buf_add(buf, lease->filename, fn_len);
1627 buf_add(buf, &sn_len, sizeof(sn_len));
1628 buf_add(buf, lease->server_name, sn_len);
1629 buf_add(buf, &pr_len, sizeof(pr_len));
1630 buf_add(buf, prefix, pr_len);
1632 for (i = 0; i < 256; i++) {
1633 buf_add(buf, &lease->options[i].len,
1634 sizeof(lease->options[i].len));
1635 buf_add(buf, lease->options[i].data,
1636 lease->options[i].len);
1639 buf_close(privfd, buf);
1645 struct imsg_hdr hdr;
1649 scripttime = time(NULL);
1651 hdr.code = IMSG_SCRIPT_GO;
1652 hdr.len = sizeof(struct imsg_hdr);
1654 buf = buf_open(hdr.len);
1656 buf_add(buf, &hdr, sizeof(hdr));
1657 buf_close(privfd, buf);
1659 bzero(&hdr, sizeof(hdr));
1660 buf_read(privfd, &hdr, sizeof(hdr));
1661 if (hdr.code != IMSG_SCRIPT_GO_RET)
1662 error("unexpected msg type %u", hdr.code);
1663 if (hdr.len != sizeof(hdr) + sizeof(int))
1664 error("received corrupted message");
1665 buf_read(privfd, &ret, sizeof(ret));
1671 priv_script_go(void)
1673 char *scriptName, *argv[2], **envp;
1674 int pid, wpid, wstatus;
1676 scripttime = time(NULL);
1678 scriptName = config->script_name;
1679 envp = client->scriptEnv;
1681 argv[0] = scriptName;
1690 wpid = wait(&wstatus);
1691 } while (wpid != pid && wpid > 0);
1697 execve(scriptName, argv, envp);
1698 error("execve (%s, ...): %m", scriptName);
1703 return (WEXITSTATUS(wstatus));
1707 script_set_env(const char *prefix, const char *name, const char *value)
1711 namelen = strlen(name);
1713 for (i = 0; client->scriptEnv[i]; i++)
1714 if (strncmp(client->scriptEnv[i], name, namelen) == 0 &&
1715 client->scriptEnv[i][namelen] == '=')
1718 if (client->scriptEnv[i])
1719 /* Reuse the slot. */
1720 free(client->scriptEnv[i]);
1722 /* New variable. Expand if necessary. */
1723 if (i >= client->scriptEnvsize - 1) {
1724 char **newscriptEnv;
1725 int newscriptEnvsize = client->scriptEnvsize + 50;
1727 newscriptEnv = realloc(client->scriptEnv,
1729 if (newscriptEnv == NULL) {
1730 free(client->scriptEnv);
1731 client->scriptEnv = NULL;
1732 client->scriptEnvsize = 0;
1733 error("script_set_env: no memory for variable");
1735 client->scriptEnv = newscriptEnv;
1736 client->scriptEnvsize = newscriptEnvsize;
1738 /* need to set the NULL pointer at end of array beyond
1740 client->scriptEnv[i + 1] = NULL;
1742 /* Allocate space and format the variable in the appropriate slot. */
1743 client->scriptEnv[i] = malloc(strlen(prefix) + strlen(name) + 1 +
1745 if (client->scriptEnv[i] == NULL)
1746 error("script_set_env: no memory for variable assignment");
1748 /* No `` or $() command substitution allowed in environment values! */
1749 for (j = 0; j < strlen(value); j++)
1753 error("illegal character (%c) in value '%s'", value[j],
1757 snprintf(client->scriptEnv[i], strlen(prefix) + strlen(name) +
1758 1 + strlen(value) + 1, "%s%s=%s", prefix, name, value);
1762 script_flush_env(void)
1766 for (i = 0; client->scriptEnv[i]; i++) {
1767 free(client->scriptEnv[i]);
1768 client->scriptEnv[i] = NULL;
1770 client->scriptEnvsize = 0;
1774 dhcp_option_ev_name(char *buf, size_t buflen, const struct option *option)
1778 for (i = 0; option->name[i]; i++) {
1779 if (i + 1 == buflen)
1781 if (option->name[i] == '-')
1784 buf[i] = option->name[i];
1794 static int state = 0;
1796 if (no_daemon || state)
1801 /* Stop logging to stderr... */
1804 if (daemon(1, 0) == -1)
1807 /* we are chrooted, daemon(3) fails to open /dev/null */
1809 dup2(nullfd, STDIN_FILENO);
1810 dup2(nullfd, STDOUT_FILENO);
1811 dup2(nullfd, STDERR_FILENO);
1818 check_option(struct client_lease *l, int option)
1823 /* we use this, since this is what gets passed to dhclient-script */
1825 opbuf = pretty_print_option(option, l->options[option].data,
1826 l->options[option].len, 0, 0);
1828 sbuf = option_as_string(option, l->options[option].data,
1829 l->options[option].len);
1832 case DHO_SUBNET_MASK:
1833 case DHO_SWAP_SERVER:
1834 case DHO_BROADCAST_ADDRESS:
1835 case DHO_DHCP_SERVER_IDENTIFIER:
1836 case DHO_ROUTER_SOLICITATION_ADDRESS:
1837 case DHO_DHCP_REQUESTED_ADDRESS:
1838 if (ipv4addrs(opbuf) == 0) {
1839 warning("Invalid IP address in option %s: %s",
1840 dhcp_options[option].name, opbuf);
1843 if (l->options[option].len != 4) { /* RFC 2132 */
1844 warning("warning: Only 1 IP address allowed in "
1845 "%s option; length %d, must be 4",
1846 dhcp_options[option].name,
1847 l->options[option].len);
1848 l->options[option].len = 4;
1851 case DHO_TIME_SERVERS:
1852 case DHO_NAME_SERVERS:
1854 case DHO_DOMAIN_NAME_SERVERS:
1855 case DHO_LOG_SERVERS:
1856 case DHO_COOKIE_SERVERS:
1857 case DHO_LPR_SERVERS:
1858 case DHO_IMPRESS_SERVERS:
1859 case DHO_RESOURCE_LOCATION_SERVERS:
1860 case DHO_NIS_SERVERS:
1861 case DHO_NTP_SERVERS:
1862 case DHO_NETBIOS_NAME_SERVERS:
1863 case DHO_NETBIOS_DD_SERVER:
1864 case DHO_FONT_SERVERS:
1865 if (ipv4addrs(opbuf) == 0) {
1866 warning("Invalid IP address in option %s: %s",
1867 dhcp_options[option].name, opbuf);
1872 case DHO_DOMAIN_NAME:
1873 case DHO_NIS_DOMAIN:
1874 if (!res_hnok(sbuf)) {
1875 warning("Bogus Host Name option %d: %s (%s)", option,
1877 l->options[option].len = 0;
1878 free(l->options[option].data);
1882 case DHO_TIME_OFFSET:
1884 case DHO_MERIT_DUMP:
1886 case DHO_EXTENSIONS_PATH:
1887 case DHO_IP_FORWARDING:
1888 case DHO_NON_LOCAL_SOURCE_ROUTING:
1889 case DHO_POLICY_FILTER:
1890 case DHO_MAX_DGRAM_REASSEMBLY:
1891 case DHO_DEFAULT_IP_TTL:
1892 case DHO_PATH_MTU_AGING_TIMEOUT:
1893 case DHO_PATH_MTU_PLATEAU_TABLE:
1894 case DHO_INTERFACE_MTU:
1895 case DHO_ALL_SUBNETS_LOCAL:
1896 case DHO_PERFORM_MASK_DISCOVERY:
1897 case DHO_MASK_SUPPLIER:
1898 case DHO_ROUTER_DISCOVERY:
1899 case DHO_STATIC_ROUTES:
1900 case DHO_TRAILER_ENCAPSULATION:
1901 case DHO_ARP_CACHE_TIMEOUT:
1902 case DHO_IEEE802_3_ENCAPSULATION:
1903 case DHO_DEFAULT_TCP_TTL:
1904 case DHO_TCP_KEEPALIVE_INTERVAL:
1905 case DHO_TCP_KEEPALIVE_GARBAGE:
1906 case DHO_VENDOR_ENCAPSULATED_OPTIONS:
1907 case DHO_NETBIOS_NODE_TYPE:
1908 case DHO_NETBIOS_SCOPE:
1909 case DHO_X_DISPLAY_MANAGER:
1910 case DHO_DHCP_LEASE_TIME:
1911 case DHO_DHCP_OPTION_OVERLOAD:
1912 case DHO_DHCP_MESSAGE_TYPE:
1913 case DHO_DHCP_PARAMETER_REQUEST_LIST:
1914 case DHO_DHCP_MESSAGE:
1915 case DHO_DHCP_MAX_MESSAGE_SIZE:
1916 case DHO_DHCP_RENEWAL_TIME:
1917 case DHO_DHCP_REBINDING_TIME:
1918 case DHO_DHCP_CLASS_IDENTIFIER:
1919 case DHO_DHCP_CLIENT_IDENTIFIER:
1920 case DHO_DHCP_USER_CLASS_ID:
1921 case DHO_TFTP_SERVER:
1926 warning("unknown dhcp option value 0x%x", option);
1927 return (unknown_ok);
1932 res_hnok(const char *name)
1934 const char *dn = name;
1935 int pch = '.', ch = *dn++;
1938 while (ch != '\0') {
1943 } else if (pch == '.' || nch == '.' || nch == '\0') {
1946 } else if (!isalnum(ch) && ch != '-' && ch != '_')
1948 else if (ch == '_' && warn == 0) {
1949 warning("warning: hostname %s contains an "
1950 "underscore which violates RFC 952", name);
1958 /* Does buf consist only of dotted decimal ipv4 addrs?
1959 * return how many if so,
1960 * otherwise, return 0
1963 ipv4addrs(char * buf)
1968 while (inet_aton(buf, &jnk) == 1){
1970 while (*buf == '.' || isdigit(*buf))
1981 option_as_string(unsigned int code, unsigned char *data, int len)
1983 static char optbuf[32768]; /* XXX */
1985 int opleft = sizeof(optbuf);
1986 unsigned char *dp = data;
1989 error("option_as_string: bad code %d", code);
1991 for (; dp < data + len; dp++) {
1992 if (!isascii(*dp) || !isprint(*dp)) {
1993 if (dp + 1 != data + len || *dp != 0) {
1995 snprintf(op, opleft, "\\%03o", *dp);
2000 } else if (*dp == '"' || *dp == '\'' || *dp == '$' ||
2001 *dp == '`' || *dp == '\\') {
2015 warning("dhcp option too large");
2020 fork_privchld(int fd, int fd2)
2022 struct pollfd pfd[1];
2023 int nfds, pfail = 0;
2027 error("cannot fork");
2035 if (chdir("/") == -1)
2036 error("chdir(\"/\")");
2038 setproctitle("%s [priv]", ifi->name);
2040 dup2(nullfd, STDIN_FILENO);
2041 dup2(nullfd, STDOUT_FILENO);
2042 dup2(nullfd, STDERR_FILENO);
2048 pfd[0].events = POLLIN;
2049 if ((nfds = poll(pfd, 1, INFTIM)) == -1)
2051 error("poll error");
2054 * Handle temporary errors, but bail if they persist.
2056 if (nfds == 0 || !(pfd[0].revents & POLLIN)) {
2057 if (pfail > POLL_FAILURES)
2058 error("poll failed > %d times", POLL_FAILURES);
2059 sleep(pfail * POLL_FAILURE_WAIT);
2069 get_ifname(char *ifname, char *arg)
2071 struct ifgroupreq ifgr;
2072 struct ifg_req *ifg;
2075 if (!strcmp(arg, "egress")) {
2076 s = socket(AF_INET, SOCK_DGRAM, 0);
2078 error("socket error");
2079 bzero(&ifgr, sizeof(ifgr));
2080 strlcpy(ifgr.ifgr_name, "egress", sizeof(ifgr.ifgr_name));
2081 if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1) {
2082 if (errno == ENOENT)
2083 error("no interface in group egress found");
2084 error("ioctl SIOCGIFGMEMB: %m");
2086 len = ifgr.ifgr_len;
2087 if ((ifgr.ifgr_groups = calloc(1, len)) == NULL)
2088 error("get_ifname");
2089 if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1)
2090 error("ioctl SIOCGIFGMEMB: %m");
2093 for (ifg = ifgr.ifgr_groups;
2094 ifg && len >= sizeof(struct ifg_req); ifg++) {
2095 len -= sizeof(struct ifg_req);
2097 error("too many interfaces in group egress");
2098 arg = ifg->ifgrq_member;
2101 if (strlcpy(ifi->name, arg, IFNAMSIZ) >= IFNAMSIZ)
2102 error("Interface name too long: %m");
2104 free(ifgr.ifgr_groups);
2106 } else if (strlcpy(ifi->name, arg, IFNAMSIZ) >= IFNAMSIZ)
2107 error("Interface name too long");