1 /* $OpenBSD: dhclient.c,v 1.63 2005/02/06 17:10:13 krw Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright 2004 Henning Brauer <henning@openbsd.org>
7 * Copyright (c) 1995, 1996, 1997, 1998, 1999
8 * The Internet Software Consortium. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of The Internet Software Consortium nor the names
20 * of its contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
24 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
25 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
28 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
31 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
32 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
34 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * This software has been written for the Internet Software Consortium
38 * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
39 * Enterprises. To learn more about the Internet Software Consortium,
40 * see ``http://www.vix.com/isc''. To learn more about Vixie
41 * Enterprises, see ``http://www.vix.com''.
43 * This client was substantially modified and enhanced by Elliot Poger
44 * for use on Linux while he was working on the MosquitoNet project at
47 * The current version owes much to Elliot's Linux enhancements, but
48 * was substantially reorganized and partially rewritten by Ted Lemon
49 * so as to use the same networking framework that the Internet Software
50 * Consortium DHCP server uses. Much system-specific configuration code
51 * was moved into a shell script so that as support for more operating
52 * systems is added, it will not be necessary to port and maintain
53 * system-specific configuration code to these operating systems - instead,
54 * the shell script can invoke the native tools to accomplish the same
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
64 #include <sys/capsicum.h>
65 #include <sys/endian.h>
67 #include <capsicum_helpers.h>
70 #include <net80211/ieee80211_freebsd.h>
73 #ifndef _PATH_VAREMPTY
74 #define _PATH_VAREMPTY "/var/empty"
78 #define hyphenchar(c) ((c) == 0x2d)
79 #define bslashchar(c) ((c) == 0x5c)
80 #define periodchar(c) ((c) == PERIOD)
81 #define asterchar(c) ((c) == 0x2a)
82 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) || \
83 ((c) >= 0x61 && (c) <= 0x7a))
84 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
85 #define whitechar(c) ((c) == ' ' || (c) == '\t')
87 #define borderchar(c) (alphachar(c) || digitchar(c))
88 #define middlechar(c) (borderchar(c) || hyphenchar(c))
89 #define domainchar(c) ((c) > 0x20 && (c) < 0x7f)
91 #define CLIENT_PATH "PATH=/usr/bin:/usr/sbin:/bin:/sbin"
93 cap_channel_t *capsyslog;
96 static time_t default_lease_time = 43200; /* 12 hours... */
98 const char *path_dhclient_conf = _PATH_DHCLIENT_CONF;
99 char *path_dhclient_db = NULL;
103 static int nullfd = -1;
105 static char hostname[_POSIX_HOST_NAME_MAX + 1];
107 static struct iaddr iaddr_broadcast = { 4, { 255, 255, 255, 255 } };
108 static struct in_addr inaddr_any, inaddr_broadcast;
110 static char *path_dhclient_pidfile;
111 struct pidfh *pidfile;
114 * ASSERT_STATE() does nothing now; it used to be
115 * assert (state_is == state_shouldbe).
117 #define ASSERT_STATE(state_is, state_shouldbe) {}
120 * We need to check that the expiry, renewal and rebind times are not beyond
121 * the end of time (~2038 when a 32-bit time_t is being used).
123 #define TIME_MAX ((((time_t) 1 << (sizeof(time_t) * CHAR_BIT - 2)) - 1) * 2 + 1)
126 static int no_daemon;
127 static int unknown_ok = 1;
130 struct interface_info *ifi;
132 int findproto(char *, int);
133 struct sockaddr *get_ifa(char *, int);
134 void routehandler(struct protocol *);
136 int check_option(struct client_lease *l, int option);
137 int check_classless_option(unsigned char *data, int len);
138 int ipv4addrs(const char * buf);
139 int res_hnok(const char *dn);
140 int check_search(const char *srch);
141 const char *option_as_string(unsigned int code, unsigned char *data, int len);
142 int fork_privchld(int, int);
145 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
146 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
148 /* Minimum MTU is 68 as per RFC791, p. 24 */
151 static time_t scripttime;
154 findproto(char *cp, int n)
161 for (i = 1; i; i <<= 1) {
163 sa = (struct sockaddr *)cp;
169 if (sa->sa_family == AF_INET)
171 if (sa->sa_family == AF_INET6)
184 get_ifa(char *cp, int n)
191 for (i = 1; i; i <<= 1)
193 sa = (struct sockaddr *)cp;
202 static struct iaddr defaddr = { .len = 4 };
203 static uint8_t curbssid[6];
208 struct interface_info *_ifi = arg;
211 * Clear existing state.
213 if (_ifi->client->active != NULL) {
214 script_init("EXPIRE", NULL);
215 script_write_params("old_",
216 _ifi->client->active);
217 if (_ifi->client->alias)
218 script_write_params("alias_",
219 _ifi->client->alias);
222 _ifi->client->state = S_INIT;
226 routehandler(struct protocol *p __unused)
228 char msg[2048], *addr;
229 struct rt_msghdr *rtm;
230 struct if_msghdr *ifm;
231 struct ifa_msghdr *ifam;
232 struct if_announcemsghdr *ifan;
233 struct ieee80211_join_event *jev;
234 struct client_lease *l;
235 time_t t = time(NULL);
236 struct sockaddr_in *sa;
241 n = read(routefd, &msg, sizeof(msg));
242 rtm = (struct rt_msghdr *)msg;
243 if (n < (ssize_t)sizeof(rtm->rtm_msglen) ||
244 n < (ssize_t)rtm->rtm_msglen ||
245 rtm->rtm_version != RTM_VERSION)
248 switch (rtm->rtm_type) {
251 ifam = (struct ifa_msghdr *)rtm;
253 if (ifam->ifam_index != ifi->index)
255 if (findproto((char *)(ifam + 1), ifam->ifam_addrs) != AF_INET)
257 if (scripttime == 0 || t < scripttime + 10)
260 sa = (struct sockaddr_in*)get_ifa((char *)(ifam + 1), ifam->ifam_addrs);
264 if ((a.len = sizeof(struct in_addr)) > sizeof(a.iabuf))
265 error("king bula sez: len mismatch");
266 memcpy(a.iabuf, &sa->sin_addr, a.len);
267 if (addr_eq(a, defaddr))
270 for (l = ifi->client->active; l != NULL; l = l->next)
271 if (addr_eq(a, l->address))
274 if (l == NULL) /* added/deleted addr is not the one we set */
277 addr = inet_ntoa(sa->sin_addr);
278 if (rtm->rtm_type == RTM_NEWADDR) {
280 * XXX: If someone other than us adds our address,
281 * should we assume they are taking over from us,
282 * delete the lease record, and exit without modifying
285 warning("My address (%s) was re-added", addr);
287 warning("My address (%s) was deleted, dhclient exiting",
293 ifm = (struct if_msghdr *)rtm;
294 if (ifm->ifm_index != ifi->index)
296 if ((rtm->rtm_flags & RTF_UP) == 0) {
297 warning("Interface %s is down, dhclient exiting",
301 linkstat = interface_link_status(ifi->name);
302 if (linkstat != ifi->linkstat) {
303 debug("%s link state %s -> %s", ifi->name,
304 ifi->linkstat ? "up" : "down",
305 linkstat ? "up" : "down");
306 ifi->linkstat = linkstat;
312 ifan = (struct if_announcemsghdr *)rtm;
313 if (ifan->ifan_what == IFAN_DEPARTURE &&
314 ifan->ifan_index == ifi->index) {
315 warning("Interface %s is gone, dhclient exiting",
321 ifan = (struct if_announcemsghdr *)rtm;
322 if (ifan->ifan_index != ifi->index)
324 switch (ifan->ifan_what) {
325 case RTM_IEEE80211_ASSOC:
326 case RTM_IEEE80211_REASSOC:
328 * Use assoc/reassoc event to kick state machine
329 * in case we roam. Otherwise fall back to the
330 * normal state machine just like a wired network.
332 jev = (struct ieee80211_join_event *) &ifan[1];
333 if (memcmp(curbssid, jev->iev_addr, 6)) {
337 memcpy(curbssid, jev->iev_addr, 6);
347 script_init("FAIL", NULL);
348 if (ifi->client->alias)
349 script_write_params("alias_", ifi->client->alias);
352 pidfile_remove(pidfile);
359 cap_channel_t *casper;
363 error("unable to start casper");
365 capsyslog = cap_service_open(casper, "system.syslog");
367 if (capsyslog == NULL)
368 error("unable to open system.syslog service");
372 main(int argc, char *argv[])
375 int ch, fd, quiet = 0, i = 0;
377 int immediate_daemon = 0;
384 /* Initially, log errors to stderr as well as to syslogd. */
385 cap_openlog(capsyslog, getprogname(), LOG_PID | LOG_NDELAY, DHCPD_LOG_FACILITY);
386 cap_setlogmask(capsyslog, LOG_UPTO(LOG_DEBUG));
388 while ((ch = getopt(argc, argv, "bc:dl:p:qu")) != -1)
391 immediate_daemon = 1;
394 path_dhclient_conf = optarg;
400 path_dhclient_db = optarg;
403 path_dhclient_pidfile = optarg;
421 if (path_dhclient_pidfile == NULL) {
422 asprintf(&path_dhclient_pidfile,
423 "%s/dhclient/dhclient.%s.pid", _PATH_VARRUN, *argv);
424 if (path_dhclient_pidfile == NULL)
427 pidfile = pidfile_open(path_dhclient_pidfile, 0644, &otherpid);
428 if (pidfile == NULL) {
430 error("dhclient already running, pid: %d.", otherpid);
432 error("dhclient already running.");
433 warning("Cannot open or create pidfile: %m");
436 if ((ifi = calloc(1, sizeof(struct interface_info))) == NULL)
438 if (strlcpy(ifi->name, argv[0], IFNAMSIZ) >= IFNAMSIZ)
439 error("Interface name too long");
440 if (path_dhclient_db == NULL && asprintf(&path_dhclient_db, "%s.%s",
441 _PATH_DHCLIENT_DB, ifi->name) == -1)
450 inaddr_broadcast.s_addr = INADDR_BROADCAST;
451 inaddr_any.s_addr = INADDR_ANY;
455 /* The next bit is potentially very time-consuming, so write out
456 the pidfile right away. We will write it out again with the
457 correct pid after daemonizing. */
459 pidfile_write(pidfile);
461 if (!interface_link_status(ifi->name)) {
462 fprintf(stderr, "%s: no link ...", ifi->name);
465 while (!interface_link_status(ifi->name)) {
466 fprintf(stderr, ".");
469 fprintf(stderr, " giving up\n");
474 fprintf(stderr, " got link\n");
478 if ((nullfd = open(_PATH_DEVNULL, O_RDWR, 0)) == -1)
479 error("cannot open %s: %m", _PATH_DEVNULL);
481 if ((pw = getpwnam("_dhcp")) == NULL) {
482 warning("no such user: _dhcp, falling back to \"nobody\"");
483 if ((pw = getpwnam("nobody")) == NULL)
484 error("no such user: nobody");
488 * Obtain hostname before entering capability mode - it won't be
489 * possible then, as reading kern.hostname is not permitted.
491 if (gethostname(hostname, sizeof(hostname)) < 0)
494 priv_script_init("PREINIT", NULL);
495 if (ifi->client->alias)
496 priv_script_write_params("alias_", ifi->client->alias);
499 /* set up the interface */
500 discover_interfaces(ifi);
502 if (pipe(pipe_fd) == -1)
505 fork_privchld(pipe_fd[0], pipe_fd[1]);
514 cap_rights_init(&rights, CAP_READ, CAP_WRITE);
515 if (caph_rights_limit(privfd, &rights) < 0)
516 error("can't limit private descriptor: %m");
518 if ((fd = open(path_dhclient_db, O_RDONLY|O_EXLOCK|O_CREAT, 0)) == -1)
519 error("can't open and lock %s: %m", path_dhclient_db);
520 read_client_leases();
521 rewrite_client_leases();
524 if ((routefd = socket(PF_ROUTE, SOCK_RAW, 0)) != -1)
525 add_protocol("AF_ROUTE", routefd, routehandler, ifi);
526 if (shutdown(routefd, SHUT_WR) < 0)
527 error("can't shutdown route socket: %m");
528 cap_rights_init(&rights, CAP_EVENT, CAP_READ);
529 if (caph_rights_limit(routefd, &rights) < 0)
530 error("can't limit route socket: %m");
534 setproctitle("%s", ifi->name);
536 /* setgroups(2) is not permitted in capability mode. */
537 if (setgroups(1, &pw->pw_gid) != 0)
538 error("can't restrict groups: %m");
540 if (caph_enter_casper() < 0)
541 error("can't enter capability mode: %m");
544 * If we are not in capability mode (i.e., Capsicum or libcasper is
545 * disabled), try to restrict filesystem access. This will fail if
546 * kern.chroot_allow_open_directories is 0 or the process is jailed.
548 if (cap_getmode(&capmode) < 0 || capmode == 0) {
549 if (chroot(_PATH_VAREMPTY) == -1)
551 if (chdir("/") == -1)
552 error("chdir(\"/\")");
555 if (setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
556 seteuid(pw->pw_uid) || setuid(pw->pw_uid))
557 error("can't drop privileges: %m");
559 if (immediate_daemon)
562 ifi->client->state = S_INIT;
565 bootp_packet_handler = do_packet;
577 fprintf(stderr, "usage: %s [-bdqu] ", getprogname());
578 fprintf(stderr, "[-c conffile] [-l leasefile] interface\n");
585 * Each routine is called from the dhclient_state_machine() in one of
587 * -> entering INIT state
588 * -> recvpacket_flag == 0: timeout in this state
589 * -> otherwise: received a packet in this state
591 * Return conditions as handled by dhclient_state_machine():
592 * Returns 1, sendpacket_flag = 1: send packet, reset timer.
593 * Returns 1, sendpacket_flag = 0: just reset the timer (wait for a milestone).
594 * Returns 0: finish the nap which was interrupted for no good reason.
596 * Several per-interface variables are used to keep track of the process:
597 * active_lease: the lease that is being used on the interface
598 * (null pointer if not configured yet).
599 * offered_leases: leases corresponding to DHCPOFFER messages that have
600 * been sent to us by DHCP servers.
601 * acked_leases: leases corresponding to DHCPACK messages that have been
602 * sent to us by DHCP servers.
603 * sendpacket: DHCP packet we're trying to send.
604 * destination: IP address to send sendpacket to
605 * In addition, there are several relevant per-lease variables.
606 * T1_expiry, T2_expiry, lease_expiry: lease milestones
607 * In the active lease, these control the process of renewing the lease;
608 * In leases on the acked_leases list, this simply determines when we
609 * can no longer legitimately use the lease.
613 state_reboot(void *ipp)
615 struct interface_info *ip = ipp;
617 /* If we don't remember an active lease, go straight to INIT. */
618 if (!ip->client->active || ip->client->active->is_bootp) {
623 /* We are in the rebooting state. */
624 ip->client->state = S_REBOOTING;
626 /* make_request doesn't initialize xid because it normally comes
627 from the DHCPDISCOVER, but we haven't sent a DHCPDISCOVER,
628 so pick an xid now. */
629 ip->client->xid = arc4random();
631 /* Make a DHCPREQUEST packet, and set appropriate per-interface
633 make_request(ip, ip->client->active);
634 ip->client->destination = iaddr_broadcast;
635 ip->client->first_sending = cur_time;
636 ip->client->interval = ip->client->config->initial_interval;
638 /* Zap the medium list... */
639 ip->client->medium = NULL;
641 /* Send out the first DHCPREQUEST packet. */
646 * Called when a lease has completely expired and we've
647 * been unable to renew it.
650 state_init(void *ipp)
652 struct interface_info *ip = ipp;
654 ASSERT_STATE(state, S_INIT);
656 /* Make a DHCPDISCOVER packet, and set appropriate per-interface
658 make_discover(ip, ip->client->active);
659 ip->client->xid = ip->client->packet.xid;
660 ip->client->destination = iaddr_broadcast;
661 ip->client->state = S_SELECTING;
662 ip->client->first_sending = cur_time;
663 ip->client->interval = ip->client->config->initial_interval;
665 /* Add an immediate timeout to cause the first DHCPDISCOVER packet
671 * state_selecting is called when one or more DHCPOFFER packets
672 * have been received and a configurable period of time has passed.
675 state_selecting(void *ipp)
677 struct interface_info *ip = ipp;
678 struct client_lease *lp, *next, *picked;
680 ASSERT_STATE(state, S_SELECTING);
682 /* Cancel state_selecting and send_discover timeouts, since either
683 one could have got us here. */
684 cancel_timeout(state_selecting, ip);
685 cancel_timeout(send_discover, ip);
687 /* We have received one or more DHCPOFFER packets. Currently,
688 the only criterion by which we judge leases is whether or
689 not we get a response when we arp for them. */
691 for (lp = ip->client->offered_leases; lp; lp = next) {
694 /* Check to see if we got an ARPREPLY for the address
695 in this particular lease. */
697 script_init("ARPCHECK", lp->medium);
698 script_write_params("check_", lp);
700 /* If the ARPCHECK code detects another
701 machine using the offered address, it exits
702 nonzero. We need to send a DHCPDECLINE and
705 make_decline(ip, lp);
713 free_client_lease(lp);
716 ip->client->offered_leases = NULL;
718 /* If we just tossed all the leases we were offered, go back
721 ip->client->state = S_INIT;
726 /* If it was a BOOTREPLY, we can just take the address right now. */
727 if (!picked->options[DHO_DHCP_MESSAGE_TYPE].len) {
728 ip->client->new = picked;
730 /* Make up some lease expiry times
731 XXX these should be configurable. */
732 ip->client->new->expiry = cur_time + 12000;
733 ip->client->new->renewal += cur_time + 8000;
734 ip->client->new->rebind += cur_time + 10000;
736 ip->client->state = S_REQUESTING;
738 /* Bind to the address we received. */
743 /* Go to the REQUESTING state. */
744 ip->client->destination = iaddr_broadcast;
745 ip->client->state = S_REQUESTING;
746 ip->client->first_sending = cur_time;
747 ip->client->interval = ip->client->config->initial_interval;
749 /* Make a DHCPREQUEST packet from the lease we picked. */
750 make_request(ip, picked);
751 ip->client->xid = ip->client->packet.xid;
753 /* Toss the lease we picked - we'll get it back in a DHCPACK. */
754 free_client_lease(picked);
756 /* Add an immediate timeout to send the first DHCPREQUEST packet. */
760 /* state_requesting is called when we receive a DHCPACK message after
761 having sent out one or more DHCPREQUEST packets. */
764 dhcpack(struct packet *packet)
766 struct interface_info *ip = packet->interface;
767 struct client_lease *lease;
769 /* If we're not receptive to an offer right now, or if the offer
770 has an unrecognizable transaction id, then just drop it. */
771 if (packet->interface->client->xid != packet->raw->xid ||
772 (packet->interface->hw_address.hlen != packet->raw->hlen) ||
773 (memcmp(packet->interface->hw_address.haddr,
774 packet->raw->chaddr, packet->raw->hlen)))
777 if (ip->client->state != S_REBOOTING &&
778 ip->client->state != S_REQUESTING &&
779 ip->client->state != S_RENEWING &&
780 ip->client->state != S_REBINDING)
783 note("DHCPACK from %s", piaddr(packet->client_addr));
785 lease = packet_to_lease(packet);
787 note("packet_to_lease failed.");
791 ip->client->new = lease;
793 /* Stop resending DHCPREQUEST. */
794 cancel_timeout(send_request, ip);
796 /* Figure out the lease time. */
797 if (ip->client->config->default_actions[DHO_DHCP_LEASE_TIME] ==
799 ip->client->new->expiry = getULong(
800 ip->client->config->defaults[DHO_DHCP_LEASE_TIME].data);
801 else if (ip->client->new->options[DHO_DHCP_LEASE_TIME].data)
802 ip->client->new->expiry = getULong(
803 ip->client->new->options[DHO_DHCP_LEASE_TIME].data);
805 ip->client->new->expiry = default_lease_time;
806 /* A number that looks negative here is really just very large,
807 because the lease expiry offset is unsigned. Also make sure that
808 the addition of cur_time below does not overflow (a 32 bit) time_t. */
809 if (ip->client->new->expiry < 0 ||
810 ip->client->new->expiry > TIME_MAX - cur_time)
811 ip->client->new->expiry = TIME_MAX - cur_time;
812 /* XXX should be fixed by resetting the client state */
813 if (ip->client->new->expiry < 60)
814 ip->client->new->expiry = 60;
816 /* Unless overridden in the config, take the server-provided renewal
817 * time if there is one. Otherwise figure it out according to the spec.
818 * Also make sure the renewal time does not exceed the expiry time.
820 if (ip->client->config->default_actions[DHO_DHCP_RENEWAL_TIME] ==
822 ip->client->new->renewal = getULong(
823 ip->client->config->defaults[DHO_DHCP_RENEWAL_TIME].data);
824 else if (ip->client->new->options[DHO_DHCP_RENEWAL_TIME].len)
825 ip->client->new->renewal = getULong(
826 ip->client->new->options[DHO_DHCP_RENEWAL_TIME].data);
828 ip->client->new->renewal = ip->client->new->expiry / 2;
829 if (ip->client->new->renewal < 0 ||
830 ip->client->new->renewal > ip->client->new->expiry / 2)
831 ip->client->new->renewal = ip->client->new->expiry / 2;
833 /* Same deal with the rebind time. */
834 if (ip->client->config->default_actions[DHO_DHCP_REBINDING_TIME] ==
836 ip->client->new->rebind = getULong(
837 ip->client->config->defaults[DHO_DHCP_REBINDING_TIME].data);
838 else if (ip->client->new->options[DHO_DHCP_REBINDING_TIME].len)
839 ip->client->new->rebind = getULong(
840 ip->client->new->options[DHO_DHCP_REBINDING_TIME].data);
842 ip->client->new->rebind = ip->client->new->renewal / 4 * 7;
843 if (ip->client->new->rebind < 0 ||
844 ip->client->new->rebind > ip->client->new->renewal / 4 * 7)
845 ip->client->new->rebind = ip->client->new->renewal / 4 * 7;
847 /* Convert the time offsets into seconds-since-the-epoch */
848 ip->client->new->expiry += cur_time;
849 ip->client->new->renewal += cur_time;
850 ip->client->new->rebind += cur_time;
856 bind_lease(struct interface_info *ip)
858 struct option_data *opt;
860 /* Remember the medium. */
861 ip->client->new->medium = ip->client->medium;
863 opt = &ip->client->new->options[DHO_INTERFACE_MTU];
864 if (opt->len == sizeof(u_int16_t)) {
866 u_int16_t old_mtu = 0;
867 bool supersede = (ip->client->config->default_actions[DHO_INTERFACE_MTU] ==
871 mtu = getUShort(ip->client->config->defaults[DHO_INTERFACE_MTU].data);
873 mtu = be16dec(opt->data);
875 if (ip->client->active) {
876 opt = &ip->client->active->options[DHO_INTERFACE_MTU];
877 if (opt->len == sizeof(u_int16_t)) {
878 old_mtu = be16dec(opt->data);
883 /* Treat 0 like a user intentionally doesn't want to change MTU and,
884 * therefore, warning is not needed */
885 if (!supersede || mtu != 0)
886 warning("mtu size %u < %d: ignored", (unsigned)mtu, MIN_MTU);
887 } else if (ip->client->state != S_RENEWING || mtu != old_mtu) {
888 interface_set_mtu_unpriv(privfd, mtu);
892 /* Write out the new lease. */
893 write_client_lease(ip, ip->client->new, 0);
895 /* Run the client script with the new parameters. */
896 script_init((ip->client->state == S_REQUESTING ? "BOUND" :
897 (ip->client->state == S_RENEWING ? "RENEW" :
898 (ip->client->state == S_REBOOTING ? "REBOOT" : "REBIND"))),
899 ip->client->new->medium);
900 if (ip->client->active && ip->client->state != S_REBOOTING)
901 script_write_params("old_", ip->client->active);
902 script_write_params("new_", ip->client->new);
903 if (ip->client->alias)
904 script_write_params("alias_", ip->client->alias);
907 /* Replace the old active lease with the new one. */
908 if (ip->client->active)
909 free_client_lease(ip->client->active);
910 ip->client->active = ip->client->new;
911 ip->client->new = NULL;
913 /* Set up a timeout to start the renewal process. */
914 add_timeout(ip->client->active->renewal, state_bound, ip);
916 note("bound to %s -- renewal in %d seconds.",
917 piaddr(ip->client->active->address),
918 (int)(ip->client->active->renewal - cur_time));
919 ip->client->state = S_BOUND;
920 reinitialize_interfaces();
925 * state_bound is called when we've successfully bound to a particular
926 * lease, but the renewal time on that lease has expired. We are
927 * expected to unicast a DHCPREQUEST to the server that gave us our
931 state_bound(void *ipp)
933 struct interface_info *ip = ipp;
935 ASSERT_STATE(state, S_BOUND);
937 /* T1 has expired. */
938 make_request(ip, ip->client->active);
939 ip->client->xid = ip->client->packet.xid;
941 if (ip->client->active->options[DHO_DHCP_SERVER_IDENTIFIER].len == 4) {
942 memcpy(ip->client->destination.iabuf, ip->client->active->
943 options[DHO_DHCP_SERVER_IDENTIFIER].data, 4);
944 ip->client->destination.len = 4;
946 ip->client->destination = iaddr_broadcast;
948 ip->client->first_sending = cur_time;
949 ip->client->interval = ip->client->config->initial_interval;
950 ip->client->state = S_RENEWING;
952 /* Send the first packet immediately. */
957 bootp(struct packet *packet)
959 struct iaddrlist *ap;
961 if (packet->raw->op != BOOTREPLY)
964 /* If there's a reject list, make sure this packet's sender isn't
966 for (ap = packet->interface->client->config->reject_list;
968 if (addr_eq(packet->client_addr, ap->addr)) {
969 note("BOOTREPLY from %s rejected.", piaddr(ap->addr));
977 dhcp(struct packet *packet)
979 struct iaddrlist *ap;
980 void (*handler)(struct packet *);
983 switch (packet->packet_type) {
1000 /* If there's a reject list, make sure this packet's sender isn't
1002 for (ap = packet->interface->client->config->reject_list;
1003 ap; ap = ap->next) {
1004 if (addr_eq(packet->client_addr, ap->addr)) {
1005 note("%s from %s rejected.", type, piaddr(ap->addr));
1013 dhcpoffer(struct packet *packet)
1015 struct interface_info *ip = packet->interface;
1016 struct client_lease *lease, *lp;
1018 int arp_timeout_needed, stop_selecting;
1019 const char *name = packet->options[DHO_DHCP_MESSAGE_TYPE].len ?
1020 "DHCPOFFER" : "BOOTREPLY";
1022 /* If we're not receptive to an offer right now, or if the offer
1023 has an unrecognizable transaction id, then just drop it. */
1024 if (ip->client->state != S_SELECTING ||
1025 packet->interface->client->xid != packet->raw->xid ||
1026 (packet->interface->hw_address.hlen != packet->raw->hlen) ||
1027 (memcmp(packet->interface->hw_address.haddr,
1028 packet->raw->chaddr, packet->raw->hlen)))
1031 note("%s from %s", name, piaddr(packet->client_addr));
1034 /* If this lease doesn't supply the minimum required parameters,
1036 for (i = 0; ip->client->config->required_options[i]; i++) {
1037 if (!packet->options[ip->client->config->
1038 required_options[i]].len) {
1039 note("%s isn't satisfactory.", name);
1044 /* If we've already seen this lease, don't record it again. */
1045 for (lease = ip->client->offered_leases;
1046 lease; lease = lease->next) {
1047 if (lease->address.len == sizeof(packet->raw->yiaddr) &&
1048 !memcmp(lease->address.iabuf,
1049 &packet->raw->yiaddr, lease->address.len)) {
1050 debug("%s already seen.", name);
1055 lease = packet_to_lease(packet);
1057 note("packet_to_lease failed.");
1061 /* If this lease was acquired through a BOOTREPLY, record that
1063 if (!packet->options[DHO_DHCP_MESSAGE_TYPE].len)
1064 lease->is_bootp = 1;
1066 /* Record the medium under which this lease was offered. */
1067 lease->medium = ip->client->medium;
1069 /* Send out an ARP Request for the offered IP address. */
1070 script_init("ARPSEND", lease->medium);
1071 script_write_params("check_", lease);
1072 /* If the script can't send an ARP request without waiting,
1073 we'll be waiting when we do the ARPCHECK, so don't wait now. */
1075 arp_timeout_needed = 0;
1077 arp_timeout_needed = 2;
1079 /* Figure out when we're supposed to stop selecting. */
1081 ip->client->first_sending + ip->client->config->select_interval;
1083 /* If this is the lease we asked for, put it at the head of the
1084 list, and don't mess with the arp request timeout. */
1085 if (lease->address.len == ip->client->requested_address.len &&
1086 !memcmp(lease->address.iabuf,
1087 ip->client->requested_address.iabuf,
1088 ip->client->requested_address.len)) {
1089 lease->next = ip->client->offered_leases;
1090 ip->client->offered_leases = lease;
1092 /* If we already have an offer, and arping for this
1093 offer would take us past the selection timeout,
1094 then don't extend the timeout - just hope for the
1096 if (ip->client->offered_leases &&
1097 (cur_time + arp_timeout_needed) > stop_selecting)
1098 arp_timeout_needed = 0;
1100 /* Put the lease at the end of the list. */
1102 if (!ip->client->offered_leases)
1103 ip->client->offered_leases = lease;
1105 for (lp = ip->client->offered_leases; lp->next;
1112 /* If we're supposed to stop selecting before we've had time
1113 to wait for the ARPREPLY, add some delay to wait for
1115 if (stop_selecting - cur_time < arp_timeout_needed)
1116 stop_selecting = cur_time + arp_timeout_needed;
1118 /* If the selecting interval has expired, go immediately to
1119 state_selecting(). Otherwise, time out into
1120 state_selecting at the select interval. */
1121 if (stop_selecting <= 0)
1122 state_selecting(ip);
1124 add_timeout(stop_selecting, state_selecting, ip);
1125 cancel_timeout(send_discover, ip);
1129 /* Allocate a client_lease structure and initialize it from the parameters
1130 in the specified packet. */
1132 struct client_lease *
1133 packet_to_lease(struct packet *packet)
1135 struct client_lease *lease;
1138 lease = malloc(sizeof(struct client_lease));
1141 warning("dhcpoffer: no memory to record lease.");
1145 memset(lease, 0, sizeof(*lease));
1147 /* Copy the lease options. */
1148 for (i = 0; i < 256; i++) {
1149 if (packet->options[i].len) {
1150 lease->options[i].data =
1151 malloc(packet->options[i].len + 1);
1152 if (!lease->options[i].data) {
1153 warning("dhcpoffer: no memory for option %d", i);
1154 free_client_lease(lease);
1157 memcpy(lease->options[i].data,
1158 packet->options[i].data,
1159 packet->options[i].len);
1160 lease->options[i].len =
1161 packet->options[i].len;
1162 lease->options[i].data[lease->options[i].len] =
1165 if (!check_option(lease,i)) {
1166 /* ignore a bogus lease offer */
1167 warning("Invalid lease option - ignoring offer");
1168 free_client_lease(lease);
1174 lease->address.len = sizeof(packet->raw->yiaddr);
1175 memcpy(lease->address.iabuf, &packet->raw->yiaddr, lease->address.len);
1177 lease->nextserver.len = sizeof(packet->raw->siaddr);
1178 memcpy(lease->nextserver.iabuf, &packet->raw->siaddr, lease->nextserver.len);
1180 /* If the server name was filled out, copy it.
1181 Do not attempt to validate the server name as a host name.
1182 RFC 2131 merely states that sname is NUL-terminated (which do
1183 do not assume) and that it is the server's host name. Since
1184 the ISC client and server allow arbitrary characters, we do
1186 if ((!packet->options[DHO_DHCP_OPTION_OVERLOAD].len ||
1187 !(packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 2)) &&
1188 packet->raw->sname[0]) {
1189 lease->server_name = malloc(DHCP_SNAME_LEN + 1);
1190 if (!lease->server_name) {
1191 warning("dhcpoffer: no memory for server name.");
1192 free_client_lease(lease);
1195 memcpy(lease->server_name, packet->raw->sname, DHCP_SNAME_LEN);
1196 lease->server_name[DHCP_SNAME_LEN]='\0';
1199 /* Ditto for the filename. */
1200 if ((!packet->options[DHO_DHCP_OPTION_OVERLOAD].len ||
1201 !(packet->options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 1)) &&
1202 packet->raw->file[0]) {
1203 /* Don't count on the NUL terminator. */
1204 lease->filename = malloc(DHCP_FILE_LEN + 1);
1205 if (!lease->filename) {
1206 warning("dhcpoffer: no memory for filename.");
1207 free_client_lease(lease);
1210 memcpy(lease->filename, packet->raw->file, DHCP_FILE_LEN);
1211 lease->filename[DHCP_FILE_LEN]='\0';
1217 dhcpnak(struct packet *packet)
1219 struct interface_info *ip = packet->interface;
1221 /* If we're not receptive to an offer right now, or if the offer
1222 has an unrecognizable transaction id, then just drop it. */
1223 if (packet->interface->client->xid != packet->raw->xid ||
1224 (packet->interface->hw_address.hlen != packet->raw->hlen) ||
1225 (memcmp(packet->interface->hw_address.haddr,
1226 packet->raw->chaddr, packet->raw->hlen)))
1229 if (ip->client->state != S_REBOOTING &&
1230 ip->client->state != S_REQUESTING &&
1231 ip->client->state != S_RENEWING &&
1232 ip->client->state != S_REBINDING)
1235 note("DHCPNAK from %s", piaddr(packet->client_addr));
1237 if (!ip->client->active) {
1238 note("DHCPNAK with no active lease.\n");
1242 free_client_lease(ip->client->active);
1243 ip->client->active = NULL;
1245 /* Stop sending DHCPREQUEST packets... */
1246 cancel_timeout(send_request, ip);
1248 ip->client->state = S_INIT;
1252 /* Send out a DHCPDISCOVER packet, and set a timeout to send out another
1253 one after the right interval has expired. If we don't get an offer by
1254 the time we reach the panic interval, call the panic function. */
1257 send_discover(void *ipp)
1259 struct interface_info *ip = ipp;
1260 int interval, increase = 1;
1262 /* Figure out how long it's been since we started transmitting. */
1263 interval = cur_time - ip->client->first_sending;
1265 /* If we're past the panic timeout, call the script and tell it
1266 we haven't found anything for this interface yet. */
1267 if (interval > ip->client->config->timeout) {
1272 /* If we're selecting media, try the whole list before doing
1273 the exponential backoff, but if we've already received an
1274 offer, stop looping, because we obviously have it right. */
1275 if (!ip->client->offered_leases &&
1276 ip->client->config->media) {
1279 if (ip->client->medium) {
1280 ip->client->medium = ip->client->medium->next;
1283 if (!ip->client->medium) {
1285 error("No valid media types for %s!", ip->name);
1286 ip->client->medium = ip->client->config->media;
1290 note("Trying medium \"%s\" %d", ip->client->medium->string,
1292 script_init("MEDIUM", ip->client->medium);
1298 * If we're supposed to increase the interval, do so. If it's
1299 * currently zero (i.e., we haven't sent any packets yet), set
1300 * it to one; otherwise, add to it a random number between zero
1301 * and two times itself. On average, this means that it will
1302 * double with every transmission.
1305 if (!ip->client->interval)
1306 ip->client->interval =
1307 ip->client->config->initial_interval;
1309 ip->client->interval += (arc4random() >> 2) %
1310 (2 * ip->client->interval);
1313 /* Don't backoff past cutoff. */
1314 if (ip->client->interval >
1315 ip->client->config->backoff_cutoff)
1316 ip->client->interval =
1317 ((ip->client->config->backoff_cutoff / 2)
1318 + ((arc4random() >> 2) %
1319 ip->client->config->backoff_cutoff));
1320 } else if (!ip->client->interval)
1321 ip->client->interval =
1322 ip->client->config->initial_interval;
1324 /* If the backoff would take us to the panic timeout, just use that
1326 if (cur_time + ip->client->interval >
1327 ip->client->first_sending + ip->client->config->timeout)
1328 ip->client->interval =
1329 (ip->client->first_sending +
1330 ip->client->config->timeout) - cur_time + 1;
1332 /* Record the number of seconds since we started sending. */
1333 if (interval < 65536)
1334 ip->client->packet.secs = htons(interval);
1336 ip->client->packet.secs = htons(65535);
1337 ip->client->secs = ip->client->packet.secs;
1339 note("DHCPDISCOVER on %s to %s port %d interval %d",
1340 ip->name, inet_ntoa(inaddr_broadcast), REMOTE_PORT,
1341 (int)ip->client->interval);
1343 /* Send out a packet. */
1344 send_packet_unpriv(privfd, &ip->client->packet,
1345 ip->client->packet_length, inaddr_any, inaddr_broadcast);
1347 add_timeout(cur_time + ip->client->interval, send_discover, ip);
1351 * state_panic gets called if we haven't received any offers in a preset
1352 * amount of time. When this happens, we try to use existing leases
1353 * that haven't yet expired, and failing that, we call the client script
1354 * and hope it can do something.
1357 state_panic(void *ipp)
1359 struct interface_info *ip = ipp;
1360 struct client_lease *loop = ip->client->active;
1361 struct client_lease *lp;
1363 note("No DHCPOFFERS received.");
1365 /* We may not have an active lease, but we may have some
1366 predefined leases that we can try. */
1367 if (!ip->client->active && ip->client->leases)
1370 /* Run through the list of leases and see if one can be used. */
1371 while (ip->client->active) {
1372 if (ip->client->active->expiry > cur_time) {
1373 note("Trying recorded lease %s",
1374 piaddr(ip->client->active->address));
1375 /* Run the client script with the existing
1377 script_init("TIMEOUT",
1378 ip->client->active->medium);
1379 script_write_params("new_", ip->client->active);
1380 if (ip->client->alias)
1381 script_write_params("alias_",
1384 /* If the old lease is still good and doesn't
1385 yet need renewal, go into BOUND state and
1386 timeout at the renewal time. */
1389 ip->client->active->renewal) {
1390 ip->client->state = S_BOUND;
1391 note("bound: renewal in %d seconds.",
1392 (int)(ip->client->active->renewal -
1395 ip->client->active->renewal,
1398 ip->client->state = S_BOUND;
1399 note("bound: immediate renewal.");
1402 reinitialize_interfaces();
1408 /* If there are no other leases, give up. */
1409 if (!ip->client->leases) {
1410 ip->client->leases = ip->client->active;
1411 ip->client->active = NULL;
1416 /* Otherwise, put the active lease at the end of the
1417 lease list, and try another lease.. */
1418 for (lp = ip->client->leases; lp->next; lp = lp->next)
1420 lp->next = ip->client->active;
1422 lp->next->next = NULL;
1423 ip->client->active = ip->client->leases;
1424 ip->client->leases = ip->client->leases->next;
1426 /* If we already tried this lease, we've exhausted the
1427 set of leases, so we might as well give up for
1429 if (ip->client->active == loop)
1432 loop = ip->client->active;
1435 /* No leases were available, or what was available didn't work, so
1436 tell the shell script that we failed to allocate an address,
1437 and try again later. */
1438 note("No working leases in persistent database - sleeping.\n");
1439 script_init("FAIL", NULL);
1440 if (ip->client->alias)
1441 script_write_params("alias_", ip->client->alias);
1443 ip->client->state = S_INIT;
1444 add_timeout(cur_time + ip->client->config->retry_interval, state_init,
1450 send_request(void *ipp)
1452 struct interface_info *ip = ipp;
1453 struct in_addr from, to;
1456 /* Figure out how long it's been since we started transmitting. */
1457 interval = cur_time - ip->client->first_sending;
1459 /* If we're in the INIT-REBOOT or REQUESTING state and we're
1460 past the reboot timeout, go to INIT and see if we can
1461 DISCOVER an address... */
1462 /* XXX In the INIT-REBOOT state, if we don't get an ACK, it
1463 means either that we're on a network with no DHCP server,
1464 or that our server is down. In the latter case, assuming
1465 that there is a backup DHCP server, DHCPDISCOVER will get
1466 us a new address, but we could also have successfully
1467 reused our old address. In the former case, we're hosed
1468 anyway. This is not a win-prone situation. */
1469 if ((ip->client->state == S_REBOOTING ||
1470 ip->client->state == S_REQUESTING) &&
1471 interval > ip->client->config->reboot_timeout) {
1473 ip->client->state = S_INIT;
1474 cancel_timeout(send_request, ip);
1479 /* If we're in the reboot state, make sure the media is set up
1481 if (ip->client->state == S_REBOOTING &&
1482 !ip->client->medium &&
1483 ip->client->active->medium ) {
1484 script_init("MEDIUM", ip->client->active->medium);
1486 /* If the medium we chose won't fly, go to INIT state. */
1490 /* Record the medium. */
1491 ip->client->medium = ip->client->active->medium;
1494 /* If the lease has expired, relinquish the address and go back
1495 to the INIT state. */
1496 if (ip->client->state != S_REQUESTING &&
1497 cur_time > ip->client->active->expiry) {
1498 /* Run the client script with the new parameters. */
1499 script_init("EXPIRE", NULL);
1500 script_write_params("old_", ip->client->active);
1501 if (ip->client->alias)
1502 script_write_params("alias_", ip->client->alias);
1505 /* Now do a preinit on the interface so that we can
1506 discover a new address. */
1507 script_init("PREINIT", NULL);
1508 if (ip->client->alias)
1509 script_write_params("alias_", ip->client->alias);
1512 ip->client->state = S_INIT;
1517 /* Do the exponential backoff... */
1518 if (!ip->client->interval)
1519 ip->client->interval = ip->client->config->initial_interval;
1521 ip->client->interval += ((arc4random() >> 2) %
1522 (2 * ip->client->interval));
1524 /* Don't backoff past cutoff. */
1525 if (ip->client->interval >
1526 ip->client->config->backoff_cutoff)
1527 ip->client->interval =
1528 ((ip->client->config->backoff_cutoff / 2) +
1529 ((arc4random() >> 2) % ip->client->interval));
1531 /* If the backoff would take us to the expiry time, just set the
1532 timeout to the expiry time. */
1533 if (ip->client->state != S_REQUESTING &&
1534 cur_time + ip->client->interval >
1535 ip->client->active->expiry)
1536 ip->client->interval =
1537 ip->client->active->expiry - cur_time + 1;
1539 /* If the lease T2 time has elapsed, or if we're not yet bound,
1540 broadcast the DHCPREQUEST rather than unicasting. */
1541 if (ip->client->state == S_REQUESTING ||
1542 ip->client->state == S_REBOOTING ||
1543 cur_time > ip->client->active->rebind)
1544 to.s_addr = INADDR_BROADCAST;
1546 memcpy(&to.s_addr, ip->client->destination.iabuf,
1549 if (ip->client->state != S_REQUESTING &&
1550 ip->client->state != S_REBOOTING)
1551 memcpy(&from, ip->client->active->address.iabuf,
1554 from.s_addr = INADDR_ANY;
1556 /* Record the number of seconds since we started sending. */
1557 if (ip->client->state == S_REQUESTING)
1558 ip->client->packet.secs = ip->client->secs;
1560 if (interval < 65536)
1561 ip->client->packet.secs = htons(interval);
1563 ip->client->packet.secs = htons(65535);
1566 note("DHCPREQUEST on %s to %s port %d", ip->name, inet_ntoa(to),
1569 /* Send out a packet. */
1570 send_packet_unpriv(privfd, &ip->client->packet,
1571 ip->client->packet_length, from, to);
1573 add_timeout(cur_time + ip->client->interval, send_request, ip);
1577 send_decline(void *ipp)
1579 struct interface_info *ip = ipp;
1581 note("DHCPDECLINE on %s to %s port %d", ip->name,
1582 inet_ntoa(inaddr_broadcast), REMOTE_PORT);
1584 /* Send out a packet. */
1585 send_packet_unpriv(privfd, &ip->client->packet,
1586 ip->client->packet_length, inaddr_any, inaddr_broadcast);
1590 make_discover(struct interface_info *ip, struct client_lease *lease)
1592 unsigned char discover = DHCPDISCOVER;
1593 struct tree_cache *options[256];
1594 struct tree_cache option_elements[256];
1597 memset(option_elements, 0, sizeof(option_elements));
1598 memset(options, 0, sizeof(options));
1599 memset(&ip->client->packet, 0, sizeof(ip->client->packet));
1601 /* Set DHCP_MESSAGE_TYPE to DHCPDISCOVER */
1602 i = DHO_DHCP_MESSAGE_TYPE;
1603 options[i] = &option_elements[i];
1604 options[i]->value = &discover;
1605 options[i]->len = sizeof(discover);
1606 options[i]->buf_size = sizeof(discover);
1607 options[i]->timeout = 0xFFFFFFFF;
1609 /* Request the options we want */
1610 i = DHO_DHCP_PARAMETER_REQUEST_LIST;
1611 options[i] = &option_elements[i];
1612 options[i]->value = ip->client->config->requested_options;
1613 options[i]->len = ip->client->config->requested_option_count;
1614 options[i]->buf_size =
1615 ip->client->config->requested_option_count;
1616 options[i]->timeout = 0xFFFFFFFF;
1618 /* If we had an address, try to get it again. */
1620 ip->client->requested_address = lease->address;
1621 i = DHO_DHCP_REQUESTED_ADDRESS;
1622 options[i] = &option_elements[i];
1623 options[i]->value = lease->address.iabuf;
1624 options[i]->len = lease->address.len;
1625 options[i]->buf_size = lease->address.len;
1626 options[i]->timeout = 0xFFFFFFFF;
1628 ip->client->requested_address.len = 0;
1630 /* Send any options requested in the config file. */
1631 for (i = 0; i < 256; i++)
1633 ip->client->config->send_options[i].data) {
1634 options[i] = &option_elements[i];
1636 ip->client->config->send_options[i].data;
1638 ip->client->config->send_options[i].len;
1639 options[i]->buf_size =
1640 ip->client->config->send_options[i].len;
1641 options[i]->timeout = 0xFFFFFFFF;
1644 /* send host name if not set via config file. */
1645 if (!options[DHO_HOST_NAME]) {
1646 if (hostname[0] != '\0') {
1648 char* posDot = strchr(hostname, '.');
1650 len = posDot - hostname;
1652 len = strlen(hostname);
1653 options[DHO_HOST_NAME] = &option_elements[DHO_HOST_NAME];
1654 options[DHO_HOST_NAME]->value = hostname;
1655 options[DHO_HOST_NAME]->len = len;
1656 options[DHO_HOST_NAME]->buf_size = len;
1657 options[DHO_HOST_NAME]->timeout = 0xFFFFFFFF;
1661 /* set unique client identifier */
1662 char client_ident[sizeof(ip->hw_address.haddr) + 1];
1663 if (!options[DHO_DHCP_CLIENT_IDENTIFIER]) {
1664 int hwlen = (ip->hw_address.hlen < sizeof(client_ident)-1) ?
1665 ip->hw_address.hlen : sizeof(client_ident)-1;
1666 client_ident[0] = ip->hw_address.htype;
1667 memcpy(&client_ident[1], ip->hw_address.haddr, hwlen);
1668 options[DHO_DHCP_CLIENT_IDENTIFIER] = &option_elements[DHO_DHCP_CLIENT_IDENTIFIER];
1669 options[DHO_DHCP_CLIENT_IDENTIFIER]->value = client_ident;
1670 options[DHO_DHCP_CLIENT_IDENTIFIER]->len = hwlen+1;
1671 options[DHO_DHCP_CLIENT_IDENTIFIER]->buf_size = hwlen+1;
1672 options[DHO_DHCP_CLIENT_IDENTIFIER]->timeout = 0xFFFFFFFF;
1675 /* Set up the option buffer... */
1676 ip->client->packet_length = cons_options(NULL, &ip->client->packet, 0,
1677 options, 0, 0, 0, NULL, 0);
1678 if (ip->client->packet_length < BOOTP_MIN_LEN)
1679 ip->client->packet_length = BOOTP_MIN_LEN;
1681 ip->client->packet.op = BOOTREQUEST;
1682 ip->client->packet.htype = ip->hw_address.htype;
1683 ip->client->packet.hlen = ip->hw_address.hlen;
1684 ip->client->packet.hops = 0;
1685 ip->client->packet.xid = arc4random();
1686 ip->client->packet.secs = 0; /* filled in by send_discover. */
1687 ip->client->packet.flags = 0;
1689 memset(&(ip->client->packet.ciaddr),
1690 0, sizeof(ip->client->packet.ciaddr));
1691 memset(&(ip->client->packet.yiaddr),
1692 0, sizeof(ip->client->packet.yiaddr));
1693 memset(&(ip->client->packet.siaddr),
1694 0, sizeof(ip->client->packet.siaddr));
1695 memset(&(ip->client->packet.giaddr),
1696 0, sizeof(ip->client->packet.giaddr));
1697 memcpy(ip->client->packet.chaddr,
1698 ip->hw_address.haddr, ip->hw_address.hlen);
1703 make_request(struct interface_info *ip, struct client_lease * lease)
1705 unsigned char request = DHCPREQUEST;
1706 struct tree_cache *options[256];
1707 struct tree_cache option_elements[256];
1710 memset(options, 0, sizeof(options));
1711 memset(&ip->client->packet, 0, sizeof(ip->client->packet));
1713 /* Set DHCP_MESSAGE_TYPE to DHCPREQUEST */
1714 i = DHO_DHCP_MESSAGE_TYPE;
1715 options[i] = &option_elements[i];
1716 options[i]->value = &request;
1717 options[i]->len = sizeof(request);
1718 options[i]->buf_size = sizeof(request);
1719 options[i]->timeout = 0xFFFFFFFF;
1721 /* Request the options we want */
1722 i = DHO_DHCP_PARAMETER_REQUEST_LIST;
1723 options[i] = &option_elements[i];
1724 options[i]->value = ip->client->config->requested_options;
1725 options[i]->len = ip->client->config->requested_option_count;
1726 options[i]->buf_size =
1727 ip->client->config->requested_option_count;
1728 options[i]->timeout = 0xFFFFFFFF;
1730 /* If we are requesting an address that hasn't yet been assigned
1731 to us, use the DHCP Requested Address option. */
1732 if (ip->client->state == S_REQUESTING) {
1733 /* Send back the server identifier... */
1734 i = DHO_DHCP_SERVER_IDENTIFIER;
1735 options[i] = &option_elements[i];
1736 options[i]->value = lease->options[i].data;
1737 options[i]->len = lease->options[i].len;
1738 options[i]->buf_size = lease->options[i].len;
1739 options[i]->timeout = 0xFFFFFFFF;
1741 if (ip->client->state == S_REQUESTING ||
1742 ip->client->state == S_REBOOTING) {
1743 ip->client->requested_address = lease->address;
1744 i = DHO_DHCP_REQUESTED_ADDRESS;
1745 options[i] = &option_elements[i];
1746 options[i]->value = lease->address.iabuf;
1747 options[i]->len = lease->address.len;
1748 options[i]->buf_size = lease->address.len;
1749 options[i]->timeout = 0xFFFFFFFF;
1751 ip->client->requested_address.len = 0;
1753 /* Send any options requested in the config file. */
1754 for (i = 0; i < 256; i++)
1756 ip->client->config->send_options[i].data) {
1757 options[i] = &option_elements[i];
1759 ip->client->config->send_options[i].data;
1761 ip->client->config->send_options[i].len;
1762 options[i]->buf_size =
1763 ip->client->config->send_options[i].len;
1764 options[i]->timeout = 0xFFFFFFFF;
1767 /* send host name if not set via config file. */
1768 if (!options[DHO_HOST_NAME]) {
1769 if (hostname[0] != '\0') {
1771 char* posDot = strchr(hostname, '.');
1773 len = posDot - hostname;
1775 len = strlen(hostname);
1776 options[DHO_HOST_NAME] = &option_elements[DHO_HOST_NAME];
1777 options[DHO_HOST_NAME]->value = hostname;
1778 options[DHO_HOST_NAME]->len = len;
1779 options[DHO_HOST_NAME]->buf_size = len;
1780 options[DHO_HOST_NAME]->timeout = 0xFFFFFFFF;
1784 /* set unique client identifier */
1785 char client_ident[sizeof(ip->hw_address.haddr) + 1];
1786 if (!options[DHO_DHCP_CLIENT_IDENTIFIER]) {
1787 int hwlen = (ip->hw_address.hlen < sizeof(client_ident)-1) ?
1788 ip->hw_address.hlen : sizeof(client_ident)-1;
1789 client_ident[0] = ip->hw_address.htype;
1790 memcpy(&client_ident[1], ip->hw_address.haddr, hwlen);
1791 options[DHO_DHCP_CLIENT_IDENTIFIER] = &option_elements[DHO_DHCP_CLIENT_IDENTIFIER];
1792 options[DHO_DHCP_CLIENT_IDENTIFIER]->value = client_ident;
1793 options[DHO_DHCP_CLIENT_IDENTIFIER]->len = hwlen+1;
1794 options[DHO_DHCP_CLIENT_IDENTIFIER]->buf_size = hwlen+1;
1795 options[DHO_DHCP_CLIENT_IDENTIFIER]->timeout = 0xFFFFFFFF;
1798 /* Set up the option buffer... */
1799 ip->client->packet_length = cons_options(NULL, &ip->client->packet, 0,
1800 options, 0, 0, 0, NULL, 0);
1801 if (ip->client->packet_length < BOOTP_MIN_LEN)
1802 ip->client->packet_length = BOOTP_MIN_LEN;
1804 ip->client->packet.op = BOOTREQUEST;
1805 ip->client->packet.htype = ip->hw_address.htype;
1806 ip->client->packet.hlen = ip->hw_address.hlen;
1807 ip->client->packet.hops = 0;
1808 ip->client->packet.xid = ip->client->xid;
1809 ip->client->packet.secs = 0; /* Filled in by send_request. */
1811 /* If we own the address we're requesting, put it in ciaddr;
1812 otherwise set ciaddr to zero. */
1813 if (ip->client->state == S_BOUND ||
1814 ip->client->state == S_RENEWING ||
1815 ip->client->state == S_REBINDING) {
1816 memcpy(&ip->client->packet.ciaddr,
1817 lease->address.iabuf, lease->address.len);
1818 ip->client->packet.flags = 0;
1820 memset(&ip->client->packet.ciaddr, 0,
1821 sizeof(ip->client->packet.ciaddr));
1822 ip->client->packet.flags = 0;
1825 memset(&ip->client->packet.yiaddr, 0,
1826 sizeof(ip->client->packet.yiaddr));
1827 memset(&ip->client->packet.siaddr, 0,
1828 sizeof(ip->client->packet.siaddr));
1829 memset(&ip->client->packet.giaddr, 0,
1830 sizeof(ip->client->packet.giaddr));
1831 memcpy(ip->client->packet.chaddr,
1832 ip->hw_address.haddr, ip->hw_address.hlen);
1836 make_decline(struct interface_info *ip, struct client_lease *lease)
1838 struct tree_cache *options[256], message_type_tree;
1839 struct tree_cache requested_address_tree;
1840 struct tree_cache server_id_tree, client_id_tree;
1841 unsigned char decline = DHCPDECLINE;
1844 memset(options, 0, sizeof(options));
1845 memset(&ip->client->packet, 0, sizeof(ip->client->packet));
1847 /* Set DHCP_MESSAGE_TYPE to DHCPDECLINE */
1848 i = DHO_DHCP_MESSAGE_TYPE;
1849 options[i] = &message_type_tree;
1850 options[i]->value = &decline;
1851 options[i]->len = sizeof(decline);
1852 options[i]->buf_size = sizeof(decline);
1853 options[i]->timeout = 0xFFFFFFFF;
1855 /* Send back the server identifier... */
1856 i = DHO_DHCP_SERVER_IDENTIFIER;
1857 options[i] = &server_id_tree;
1858 options[i]->value = lease->options[i].data;
1859 options[i]->len = lease->options[i].len;
1860 options[i]->buf_size = lease->options[i].len;
1861 options[i]->timeout = 0xFFFFFFFF;
1863 /* Send back the address we're declining. */
1864 i = DHO_DHCP_REQUESTED_ADDRESS;
1865 options[i] = &requested_address_tree;
1866 options[i]->value = lease->address.iabuf;
1867 options[i]->len = lease->address.len;
1868 options[i]->buf_size = lease->address.len;
1869 options[i]->timeout = 0xFFFFFFFF;
1871 /* Send the uid if the user supplied one. */
1872 i = DHO_DHCP_CLIENT_IDENTIFIER;
1873 if (ip->client->config->send_options[i].len) {
1874 options[i] = &client_id_tree;
1875 options[i]->value = ip->client->config->send_options[i].data;
1876 options[i]->len = ip->client->config->send_options[i].len;
1877 options[i]->buf_size = ip->client->config->send_options[i].len;
1878 options[i]->timeout = 0xFFFFFFFF;
1882 /* Set up the option buffer... */
1883 ip->client->packet_length = cons_options(NULL, &ip->client->packet, 0,
1884 options, 0, 0, 0, NULL, 0);
1885 if (ip->client->packet_length < BOOTP_MIN_LEN)
1886 ip->client->packet_length = BOOTP_MIN_LEN;
1888 ip->client->packet.op = BOOTREQUEST;
1889 ip->client->packet.htype = ip->hw_address.htype;
1890 ip->client->packet.hlen = ip->hw_address.hlen;
1891 ip->client->packet.hops = 0;
1892 ip->client->packet.xid = ip->client->xid;
1893 ip->client->packet.secs = 0; /* Filled in by send_request. */
1894 ip->client->packet.flags = 0;
1896 /* ciaddr must always be zero. */
1897 memset(&ip->client->packet.ciaddr, 0,
1898 sizeof(ip->client->packet.ciaddr));
1899 memset(&ip->client->packet.yiaddr, 0,
1900 sizeof(ip->client->packet.yiaddr));
1901 memset(&ip->client->packet.siaddr, 0,
1902 sizeof(ip->client->packet.siaddr));
1903 memset(&ip->client->packet.giaddr, 0,
1904 sizeof(ip->client->packet.giaddr));
1905 memcpy(ip->client->packet.chaddr,
1906 ip->hw_address.haddr, ip->hw_address.hlen);
1910 free_client_lease(struct client_lease *lease)
1914 if (lease->server_name)
1915 free(lease->server_name);
1916 if (lease->filename)
1917 free(lease->filename);
1918 for (i = 0; i < 256; i++) {
1919 if (lease->options[i].len)
1920 free(lease->options[i].data);
1925 static FILE *leaseFile;
1928 rewrite_client_leases(void)
1930 struct client_lease *lp;
1931 cap_rights_t rights;
1934 leaseFile = fopen(path_dhclient_db, "w");
1936 error("can't create %s: %m", path_dhclient_db);
1937 cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_FSYNC,
1938 CAP_FTRUNCATE, CAP_SEEK, CAP_WRITE);
1939 if (caph_rights_limit(fileno(leaseFile), &rights) < 0) {
1940 error("can't limit lease descriptor: %m");
1942 if (caph_fcntls_limit(fileno(leaseFile), CAP_FCNTL_GETFL) < 0) {
1943 error("can't limit lease descriptor fcntls: %m");
1950 for (lp = ifi->client->leases; lp; lp = lp->next)
1951 write_client_lease(ifi, lp, 1);
1952 if (ifi->client->active)
1953 write_client_lease(ifi, ifi->client->active, 1);
1956 ftruncate(fileno(leaseFile), ftello(leaseFile));
1957 fsync(fileno(leaseFile));
1961 write_client_lease(struct interface_info *ip, struct client_lease *lease,
1964 static int leases_written;
1969 if (leases_written++ > 20) {
1970 rewrite_client_leases();
1975 /* If the lease came from the config file, we don't need to stash
1976 a copy in the lease database. */
1977 if (lease->is_static)
1980 if (!leaseFile) { /* XXX */
1981 leaseFile = fopen(path_dhclient_db, "w");
1983 error("can't create %s: %m", path_dhclient_db);
1986 fprintf(leaseFile, "lease {\n");
1987 if (lease->is_bootp)
1988 fprintf(leaseFile, " bootp;\n");
1989 fprintf(leaseFile, " interface \"%s\";\n", ip->name);
1990 fprintf(leaseFile, " fixed-address %s;\n", piaddr(lease->address));
1991 if (lease->nextserver.len == sizeof(inaddr_any) &&
1992 0 != memcmp(lease->nextserver.iabuf, &inaddr_any,
1993 sizeof(inaddr_any)))
1994 fprintf(leaseFile, " next-server %s;\n",
1995 piaddr(lease->nextserver));
1996 if (lease->filename)
1997 fprintf(leaseFile, " filename \"%s\";\n", lease->filename);
1998 if (lease->server_name)
1999 fprintf(leaseFile, " server-name \"%s\";\n",
2000 lease->server_name);
2002 fprintf(leaseFile, " medium \"%s\";\n", lease->medium->string);
2003 for (i = 0; i < 256; i++)
2004 if (lease->options[i].len)
2005 fprintf(leaseFile, " option %s %s;\n",
2006 dhcp_options[i].name,
2007 pretty_print_option(i, lease->options[i].data,
2008 lease->options[i].len, 1, 1));
2010 t = gmtime(&lease->renewal);
2011 fprintf(leaseFile, " renew %d %d/%d/%d %02d:%02d:%02d;\n",
2012 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
2013 t->tm_hour, t->tm_min, t->tm_sec);
2014 t = gmtime(&lease->rebind);
2015 fprintf(leaseFile, " rebind %d %d/%d/%d %02d:%02d:%02d;\n",
2016 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
2017 t->tm_hour, t->tm_min, t->tm_sec);
2018 t = gmtime(&lease->expiry);
2019 fprintf(leaseFile, " expire %d %d/%d/%d %02d:%02d:%02d;\n",
2020 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
2021 t->tm_hour, t->tm_min, t->tm_sec);
2022 fprintf(leaseFile, "}\n");
2027 script_init(const char *reason, struct string_list *medium)
2029 size_t len, mediumlen = 0;
2030 struct imsg_hdr hdr;
2034 if (medium != NULL && medium->string != NULL)
2035 mediumlen = strlen(medium->string);
2037 hdr.code = IMSG_SCRIPT_INIT;
2038 hdr.len = sizeof(struct imsg_hdr) +
2039 sizeof(size_t) + mediumlen +
2040 sizeof(size_t) + strlen(reason);
2042 if ((buf = buf_open(hdr.len)) == NULL)
2043 error("buf_open: %m");
2046 errs += buf_add(buf, &hdr, sizeof(hdr));
2047 errs += buf_add(buf, &mediumlen, sizeof(mediumlen));
2049 errs += buf_add(buf, medium->string, mediumlen);
2050 len = strlen(reason);
2051 errs += buf_add(buf, &len, sizeof(len));
2052 errs += buf_add(buf, reason, len);
2055 error("buf_add: %m");
2057 if (buf_close(privfd, buf) == -1)
2058 error("buf_close: %m");
2062 priv_script_init(const char *reason, char *medium)
2064 struct interface_info *ip = ifi;
2067 ip->client->scriptEnvsize = 100;
2068 if (ip->client->scriptEnv == NULL)
2069 ip->client->scriptEnv =
2070 malloc(ip->client->scriptEnvsize * sizeof(char *));
2071 if (ip->client->scriptEnv == NULL)
2072 error("script_init: no memory for environment");
2074 ip->client->scriptEnv[0] = strdup(CLIENT_PATH);
2075 if (ip->client->scriptEnv[0] == NULL)
2076 error("script_init: no memory for environment");
2078 ip->client->scriptEnv[1] = NULL;
2080 script_set_env(ip->client, "", "interface", ip->name);
2083 script_set_env(ip->client, "", "medium", medium);
2085 script_set_env(ip->client, "", "reason", reason);
2090 priv_script_write_params(const char *prefix, struct client_lease *lease)
2092 struct interface_info *ip = ifi;
2093 u_int8_t dbuf[1500], *dp = NULL;
2098 script_set_env(ip->client, prefix, "ip_address",
2099 piaddr(lease->address));
2101 if (ip->client->config->default_actions[DHO_SUBNET_MASK] ==
2103 dp = ip->client->config->defaults[DHO_SUBNET_MASK].data;
2104 len = ip->client->config->defaults[DHO_SUBNET_MASK].len;
2106 dp = lease->options[DHO_SUBNET_MASK].data;
2107 len = lease->options[DHO_SUBNET_MASK].len;
2109 if (len && (len < sizeof(lease->address.iabuf))) {
2110 struct iaddr netmask, subnet, broadcast;
2112 memcpy(netmask.iabuf, dp, len);
2114 subnet = subnet_number(lease->address, netmask);
2116 script_set_env(ip->client, prefix, "network_number",
2118 if (!lease->options[DHO_BROADCAST_ADDRESS].len) {
2119 broadcast = broadcast_addr(subnet, netmask);
2121 script_set_env(ip->client, prefix,
2122 "broadcast_address",
2128 if (lease->filename)
2129 script_set_env(ip->client, prefix, "filename", lease->filename);
2130 if (lease->server_name)
2131 script_set_env(ip->client, prefix, "server_name",
2132 lease->server_name);
2133 for (i = 0; i < 256; i++) {
2136 if (ip->client->config->defaults[i].len) {
2137 if (lease->options[i].len) {
2139 ip->client->config->default_actions[i]) {
2140 case ACTION_DEFAULT:
2141 dp = lease->options[i].data;
2142 len = lease->options[i].len;
2144 case ACTION_SUPERSEDE:
2147 config->defaults[i].data;
2149 config->defaults[i].len;
2151 case ACTION_PREPEND:
2153 config->defaults[i].len +
2154 lease->options[i].len;
2155 if (len >= sizeof(dbuf)) {
2156 warning("no space to %s %s",
2158 dhcp_options[i].name);
2164 config->defaults[i].data,
2166 config->defaults[i].len);
2167 memcpy(dp + ip->client->
2168 config->defaults[i].len,
2169 lease->options[i].data,
2170 lease->options[i].len);
2175 * When we append, we assume that we're
2176 * appending to text. Some MS servers
2177 * include a NUL byte at the end of
2178 * the search string provided.
2181 config->defaults[i].len +
2182 lease->options[i].len;
2183 if (len >= sizeof(dbuf)) {
2184 warning("no space to %s %s",
2186 dhcp_options[i].name);
2190 lease->options[i].data,
2191 lease->options[i].len);
2192 for (dp = dbuf + lease->options[i].len;
2193 dp > dbuf; dp--, len--)
2198 config->defaults[i].data,
2200 config->defaults[i].len);
2206 config->defaults[i].data;
2208 config->defaults[i].len;
2210 } else if (lease->options[i].len) {
2211 len = lease->options[i].len;
2212 dp = lease->options[i].data;
2219 if (dhcp_option_ev_name(name, sizeof(name),
2221 script_set_env(ip->client, prefix, name,
2222 pretty_print_option(i, dp, len, 0, 0));
2225 snprintf(tbuf, sizeof(tbuf), "%d", (int)lease->expiry);
2226 script_set_env(ip->client, prefix, "expiry", tbuf);
2230 script_write_params(const char *prefix, struct client_lease *lease)
2232 size_t fn_len = 0, sn_len = 0, pr_len = 0;
2233 struct imsg_hdr hdr;
2237 if (lease->filename != NULL)
2238 fn_len = strlen(lease->filename);
2239 if (lease->server_name != NULL)
2240 sn_len = strlen(lease->server_name);
2242 pr_len = strlen(prefix);
2244 hdr.code = IMSG_SCRIPT_WRITE_PARAMS;
2245 hdr.len = sizeof(hdr) + sizeof(*lease) +
2246 sizeof(fn_len) + fn_len + sizeof(sn_len) + sn_len +
2247 sizeof(pr_len) + pr_len;
2249 for (i = 0; i < 256; i++) {
2250 hdr.len += sizeof(lease->options[i].len);
2251 hdr.len += lease->options[i].len;
2254 scripttime = time(NULL);
2256 if ((buf = buf_open(hdr.len)) == NULL)
2257 error("buf_open: %m");
2260 errs += buf_add(buf, &hdr, sizeof(hdr));
2261 errs += buf_add(buf, lease, sizeof(*lease));
2262 errs += buf_add(buf, &fn_len, sizeof(fn_len));
2263 errs += buf_add(buf, lease->filename, fn_len);
2264 errs += buf_add(buf, &sn_len, sizeof(sn_len));
2265 errs += buf_add(buf, lease->server_name, sn_len);
2266 errs += buf_add(buf, &pr_len, sizeof(pr_len));
2267 errs += buf_add(buf, prefix, pr_len);
2269 for (i = 0; i < 256; i++) {
2270 errs += buf_add(buf, &lease->options[i].len,
2271 sizeof(lease->options[i].len));
2272 errs += buf_add(buf, lease->options[i].data,
2273 lease->options[i].len);
2277 error("buf_add: %m");
2279 if (buf_close(privfd, buf) == -1)
2280 error("buf_close: %m");
2286 struct imsg_hdr hdr;
2290 hdr.code = IMSG_SCRIPT_GO;
2291 hdr.len = sizeof(struct imsg_hdr);
2293 if ((buf = buf_open(hdr.len)) == NULL)
2294 error("buf_open: %m");
2296 if (buf_add(buf, &hdr, sizeof(hdr)))
2297 error("buf_add: %m");
2299 if (buf_close(privfd, buf) == -1)
2300 error("buf_close: %m");
2302 bzero(&hdr, sizeof(hdr));
2303 buf_read(privfd, &hdr, sizeof(hdr));
2304 if (hdr.code != IMSG_SCRIPT_GO_RET)
2305 error("unexpected msg type %u", hdr.code);
2306 if (hdr.len != sizeof(hdr) + sizeof(int))
2307 error("received corrupted message");
2308 buf_read(privfd, &ret, sizeof(ret));
2310 scripttime = time(NULL);
2316 priv_script_go(void)
2318 char *scriptName, *argv[2], **envp, *epp[3], reason[] = "REASON=NBI";
2319 static char client_path[] = CLIENT_PATH;
2320 struct interface_info *ip = ifi;
2321 int pid, wpid, wstatus;
2323 scripttime = time(NULL);
2326 scriptName = ip->client->config->script_name;
2327 envp = ip->client->scriptEnv;
2329 scriptName = top_level_config.script_name;
2331 epp[1] = client_path;
2336 argv[0] = scriptName;
2345 wpid = wait(&wstatus);
2346 } while (wpid != pid && wpid > 0);
2352 execve(scriptName, argv, envp);
2353 error("execve (%s, ...): %m", scriptName);
2357 script_flush_env(ip->client);
2359 return (WIFEXITED(wstatus) ?
2360 WEXITSTATUS(wstatus) : 128 + WTERMSIG(wstatus));
2364 script_set_env(struct client_state *client, const char *prefix,
2365 const char *name, const char *value)
2370 /* No `` or $() command substitution allowed in environment values! */
2371 for (j=0; j < strlen(value); j++)
2375 warning("illegal character (%c) in value '%s'",
2377 /* Ignore this option */
2381 namelen = strlen(name);
2383 for (i = 0; client->scriptEnv[i]; i++)
2384 if (strncmp(client->scriptEnv[i], name, namelen) == 0 &&
2385 client->scriptEnv[i][namelen] == '=')
2388 if (client->scriptEnv[i])
2389 /* Reuse the slot. */
2390 free(client->scriptEnv[i]);
2392 /* New variable. Expand if necessary. */
2393 if (i >= client->scriptEnvsize - 1) {
2394 char **newscriptEnv;
2395 int newscriptEnvsize = client->scriptEnvsize + 50;
2397 newscriptEnv = realloc(client->scriptEnv,
2399 if (newscriptEnv == NULL) {
2400 free(client->scriptEnv);
2401 client->scriptEnv = NULL;
2402 client->scriptEnvsize = 0;
2403 error("script_set_env: no memory for variable");
2405 client->scriptEnv = newscriptEnv;
2406 client->scriptEnvsize = newscriptEnvsize;
2408 /* need to set the NULL pointer at end of array beyond
2410 client->scriptEnv[i + 1] = NULL;
2412 /* Allocate space and format the variable in the appropriate slot. */
2413 client->scriptEnv[i] = malloc(strlen(prefix) + strlen(name) + 1 +
2415 if (client->scriptEnv[i] == NULL)
2416 error("script_set_env: no memory for variable assignment");
2417 snprintf(client->scriptEnv[i], strlen(prefix) + strlen(name) +
2418 1 + strlen(value) + 1, "%s%s=%s", prefix, name, value);
2422 script_flush_env(struct client_state *client)
2426 for (i = 0; client->scriptEnv[i]; i++) {
2427 free(client->scriptEnv[i]);
2428 client->scriptEnv[i] = NULL;
2430 client->scriptEnvsize = 0;
2434 dhcp_option_ev_name(char *buf, size_t buflen, struct option *option)
2438 for (i = 0; option->name[i]; i++) {
2439 if (i + 1 == buflen)
2441 if (option->name[i] == '-')
2444 buf[i] = option->name[i];
2454 static int state = 0;
2455 cap_rights_t rights;
2457 if (no_daemon || state)
2462 /* Stop logging to stderr... */
2465 if (daemonfd(-1, nullfd) == -1)
2468 cap_rights_init(&rights);
2470 if (pidfile != NULL) {
2471 pidfile_write(pidfile);
2473 if (caph_rights_limit(pidfile_fileno(pidfile), &rights) < 0)
2474 error("can't limit pidfile descriptor: %m");
2482 if (caph_rights_limit(STDIN_FILENO, &rights) < 0)
2483 error("can't limit stdin: %m");
2484 cap_rights_init(&rights, CAP_WRITE);
2485 if (caph_rights_limit(STDOUT_FILENO, &rights) < 0)
2486 error("can't limit stdout: %m");
2487 if (caph_rights_limit(STDERR_FILENO, &rights) < 0)
2488 error("can't limit stderr: %m");
2492 check_option(struct client_lease *l, int option)
2497 /* we use this, since this is what gets passed to dhclient-script */
2499 opbuf = pretty_print_option(option, l->options[option].data,
2500 l->options[option].len, 0, 0);
2502 sbuf = option_as_string(option, l->options[option].data,
2503 l->options[option].len);
2506 case DHO_SUBNET_MASK:
2507 case DHO_TIME_SERVERS:
2508 case DHO_NAME_SERVERS:
2510 case DHO_DOMAIN_NAME_SERVERS:
2511 case DHO_LOG_SERVERS:
2512 case DHO_COOKIE_SERVERS:
2513 case DHO_LPR_SERVERS:
2514 case DHO_IMPRESS_SERVERS:
2515 case DHO_RESOURCE_LOCATION_SERVERS:
2516 case DHO_SWAP_SERVER:
2517 case DHO_BROADCAST_ADDRESS:
2518 case DHO_NIS_SERVERS:
2519 case DHO_NTP_SERVERS:
2520 case DHO_NETBIOS_NAME_SERVERS:
2521 case DHO_NETBIOS_DD_SERVER:
2522 case DHO_FONT_SERVERS:
2523 case DHO_DHCP_SERVER_IDENTIFIER:
2524 case DHO_NISPLUS_SERVERS:
2525 case DHO_MOBILE_IP_HOME_AGENT:
2526 case DHO_SMTP_SERVER:
2527 case DHO_POP_SERVER:
2528 case DHO_NNTP_SERVER:
2529 case DHO_WWW_SERVER:
2530 case DHO_FINGER_SERVER:
2531 case DHO_IRC_SERVER:
2532 case DHO_STREETTALK_SERVER:
2533 case DHO_STREETTALK_DA_SERVER:
2534 if (!ipv4addrs(opbuf)) {
2535 warning("Invalid IP address in option: %s", opbuf);
2540 case DHO_NIS_DOMAIN:
2541 case DHO_NISPLUS_DOMAIN:
2542 case DHO_TFTP_SERVER_NAME:
2543 if (!res_hnok(sbuf)) {
2544 warning("Bogus Host Name option %d: %s (%s)", option,
2546 l->options[option].len = 0;
2547 free(l->options[option].data);
2550 case DHO_DOMAIN_NAME:
2551 case DHO_DOMAIN_SEARCH:
2552 if (!res_hnok(sbuf)) {
2553 if (!check_search(sbuf)) {
2554 warning("Bogus domain search list %d: %s (%s)",
2555 option, sbuf, opbuf);
2556 l->options[option].len = 0;
2557 free(l->options[option].data);
2562 case DHO_TIME_OFFSET:
2564 case DHO_MERIT_DUMP:
2566 case DHO_EXTENSIONS_PATH:
2567 case DHO_IP_FORWARDING:
2568 case DHO_NON_LOCAL_SOURCE_ROUTING:
2569 case DHO_POLICY_FILTER:
2570 case DHO_MAX_DGRAM_REASSEMBLY:
2571 case DHO_DEFAULT_IP_TTL:
2572 case DHO_PATH_MTU_AGING_TIMEOUT:
2573 case DHO_PATH_MTU_PLATEAU_TABLE:
2574 case DHO_INTERFACE_MTU:
2575 case DHO_ALL_SUBNETS_LOCAL:
2576 case DHO_PERFORM_MASK_DISCOVERY:
2577 case DHO_MASK_SUPPLIER:
2578 case DHO_ROUTER_DISCOVERY:
2579 case DHO_ROUTER_SOLICITATION_ADDRESS:
2580 case DHO_STATIC_ROUTES:
2581 case DHO_TRAILER_ENCAPSULATION:
2582 case DHO_ARP_CACHE_TIMEOUT:
2583 case DHO_IEEE802_3_ENCAPSULATION:
2584 case DHO_DEFAULT_TCP_TTL:
2585 case DHO_TCP_KEEPALIVE_INTERVAL:
2586 case DHO_TCP_KEEPALIVE_GARBAGE:
2587 case DHO_VENDOR_ENCAPSULATED_OPTIONS:
2588 case DHO_NETBIOS_NODE_TYPE:
2589 case DHO_NETBIOS_SCOPE:
2590 case DHO_X_DISPLAY_MANAGER:
2591 case DHO_DHCP_REQUESTED_ADDRESS:
2592 case DHO_DHCP_LEASE_TIME:
2593 case DHO_DHCP_OPTION_OVERLOAD:
2594 case DHO_DHCP_MESSAGE_TYPE:
2595 case DHO_DHCP_PARAMETER_REQUEST_LIST:
2596 case DHO_DHCP_MESSAGE:
2597 case DHO_DHCP_MAX_MESSAGE_SIZE:
2598 case DHO_DHCP_RENEWAL_TIME:
2599 case DHO_DHCP_REBINDING_TIME:
2600 case DHO_DHCP_CLASS_IDENTIFIER:
2601 case DHO_DHCP_CLIENT_IDENTIFIER:
2602 case DHO_BOOTFILE_NAME:
2603 case DHO_DHCP_USER_CLASS_ID:
2607 case DHO_CLASSLESS_ROUTES:
2608 return (check_classless_option(l->options[option].data,
2609 l->options[option].len));
2611 warning("unknown dhcp option value 0x%x", option);
2612 return (unknown_ok);
2616 /* RFC 3442 The Classless Static Routes option checks */
2618 check_classless_option(unsigned char *data, int len)
2621 unsigned char width;
2622 in_addr_t addr, mask;
2625 warning("Too small length: %d", len);
2633 } else if (width < 9) {
2634 addr = (in_addr_t)(data[i] << 24);
2636 } else if (width < 17) {
2637 addr = (in_addr_t)(data[i] << 24) +
2638 (in_addr_t)(data[i + 1] << 16);
2640 } else if (width < 25) {
2641 addr = (in_addr_t)(data[i] << 24) +
2642 (in_addr_t)(data[i + 1] << 16) +
2643 (in_addr_t)(data[i + 2] << 8);
2645 } else if (width < 33) {
2646 addr = (in_addr_t)(data[i] << 24) +
2647 (in_addr_t)(data[i + 1] << 16) +
2648 (in_addr_t)(data[i + 2] << 8) +
2652 warning("Incorrect subnet width: %d", width);
2655 mask = (in_addr_t)(~0) << (32 - width);
2661 * ... After deriving a subnet number and subnet mask
2662 * from each destination descriptor, the DHCP client
2663 * MUST zero any bits in the subnet number where the
2664 * corresponding bit in the mask is zero...
2666 if ((addr & mask) != addr) {
2668 data[i - 1] = (unsigned char)(
2669 (addr >> (((32 - width)/8)*8)) & 0xFF);
2674 warning("Incorrect data length: %d (must be %d)", len, i);
2681 res_hnok(const char *dn)
2683 int pch = PERIOD, ch = *dn++;
2685 while (ch != '\0') {
2688 if (periodchar(ch)) {
2690 } else if (periodchar(pch)) {
2691 if (!borderchar(ch))
2693 } else if (periodchar(nch) || nch == '\0') {
2694 if (!borderchar(ch))
2697 if (!middlechar(ch))
2706 check_search(const char *srch)
2708 int pch = PERIOD, ch = *srch++;
2711 /* 256 char limit re resolv.conf(5) */
2712 if (strlen(srch) > 256)
2715 while (whitechar(ch))
2718 while (ch != '\0') {
2721 if (periodchar(ch) || whitechar(ch)) {
2723 } else if (periodchar(pch)) {
2724 if (!borderchar(ch))
2726 } else if (periodchar(nch) || nch == '\0') {
2727 if (!borderchar(ch))
2730 if (!middlechar(ch))
2733 if (!whitechar(ch)) {
2736 while (whitechar(nch)) {
2745 /* 6 domain limit re resolv.conf(5) */
2751 /* Does buf consist only of dotted decimal ipv4 addrs?
2752 * return how many if so,
2753 * otherwise, return 0
2756 ipv4addrs(const char * buf)
2761 while (inet_aton(buf, &jnk) == 1){
2763 while (periodchar(*buf) || digitchar(*buf))
2775 option_as_string(unsigned int code, unsigned char *data, int len)
2777 static char optbuf[32768]; /* XXX */
2779 int opleft = sizeof(optbuf);
2780 unsigned char *dp = data;
2783 error("option_as_string: bad code %d", code);
2785 for (; dp < data + len; dp++) {
2786 if (!isascii(*dp) || !isprint(*dp)) {
2787 if (dp + 1 != data + len || *dp != 0) {
2788 snprintf(op, opleft, "\\%03o", *dp);
2792 } else if (*dp == '"' || *dp == '\'' || *dp == '$' ||
2793 *dp == '`' || *dp == '\\') {
2807 warning("dhcp option too large");
2812 fork_privchld(int fd, int fd2)
2814 struct pollfd pfd[1];
2819 error("cannot fork");
2826 setproctitle("%s [priv]", ifi->name);
2829 dup2(nullfd, STDIN_FILENO);
2830 dup2(nullfd, STDOUT_FILENO);
2831 dup2(nullfd, STDERR_FILENO);
2839 pfd[0].events = POLLIN;
2840 if ((nfds = poll(pfd, 1, INFTIM)) == -1)
2842 error("poll error");
2844 if (nfds == 0 || !(pfd[0].revents & POLLIN))
2847 dispatch_imsg(ifi, fd);