dhclient - Only warn on unknown options when appropiate.
[dragonfly.git] / sbin / dhclient / dhclient.c
CommitLineData
b796b237 1/* $OpenBSD: src/sbin/dhclient/dhclient.c,v 1.140 2011/04/17 20:06:08 phessler Exp $ */
846204b6
HT
2
3/*
4 * Copyright 2004 Henning Brauer <henning@openbsd.org>
5 * Copyright (c) 1995, 1996, 1997, 1998, 1999
6 * The Internet Software Consortium. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
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.
20 *
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
33 * SUCH DAMAGE.
34 *
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''.
40 *
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
43 * Stanford.
44 *
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
53 * purpose.
54 */
d63fb838 55#include <sys/ioctl.h>
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HT
56
57#include <ctype.h>
58#include <poll.h>
59#include <pwd.h>
a05d48e6 60#include <unistd.h>
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HT
61
62#include "dhcpd.h"
63#include "privsep.h"
64
65#define CLIENT_PATH "PATH=/usr/bin:/usr/sbin:/bin:/sbin"
66#define DEFAULT_LEASE_TIME 43200 /* 12 hours... */
67#define TIME_MAX 2147483647
a05d48e6
SG
68#define POLL_FAILURES 10
69#define POLL_FAILURE_WAIT 1 /* Back off multiplier (seconds) */
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HT
70
71time_t cur_time;
72
73char *path_dhclient_conf = _PATH_DHCLIENT_CONF;
74char *path_dhclient_db = NULL;
75
76int log_perror = 1;
77int privfd;
78int nullfd = -1;
79int no_daemon;
80int unknown_ok = 1;
81int routefd = -1;
82
83struct iaddr iaddr_broadcast = { 4, { 255, 255, 255, 255 } };
84struct in_addr inaddr_any;
85struct sockaddr_in sockaddr_broadcast;
86
87struct interface_info *ifi;
88struct client_state *client;
89struct client_config *config;
90
91int findproto(char *, int);
92struct sockaddr *get_ifa(char *, int);
93void usage(void);
94int check_option(struct client_lease *l, int option);
95int ipv4addrs(char * buf);
96int res_hnok(const char *dn);
97char *option_as_string(unsigned int code, unsigned char *data, int len);
98int fork_privchld(int, int);
d63fb838 99void get_ifname(char *, char *);
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HT
100#define ROUNDUP(a) \
101 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
102#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
103
104time_t scripttime;
105static FILE *leaseFile;
106
107int
108findproto(char *cp, int n)
109{
110 struct sockaddr *sa;
111 int i;
112
113 if (n == 0)
114 return -1;
115 for (i = 1; i; i <<= 1) {
116 if (i & n) {
117 sa = (struct sockaddr *)cp;
118 switch (i) {
119 case RTA_IFA:
120 case RTA_DST:
121 case RTA_GATEWAY:
122 case RTA_NETMASK:
123 if (sa->sa_family == AF_INET)
124 return AF_INET;
125 if (sa->sa_family == AF_INET6)
126 return AF_INET6;
127 break;
128 case RTA_IFP:
129 break;
130 }
131 ADVANCE(cp, sa);
132 }
133 }
134 return (-1);
135}
136
137struct sockaddr *
138get_ifa(char *cp, int n)
139{
140 struct sockaddr *sa;
141 int i;
142
143 if (n == 0)
144 return (NULL);
145 for (i = 1; i; i <<= 1)
146 if (i & n) {
147 sa = (struct sockaddr *)cp;
148 if (i == RTA_IFA)
149 return (sa);
150 ADVANCE(cp, sa);
151 }
152
153 return (NULL);
154}
be18cf74 155struct iaddr defaddr = { .len = 4 }; /* NULL is for silence warnings */
846204b6 156
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HT
157void
158routehandler(void)
159{
160 int linkstat;
161 char msg[2048];
162 struct rt_msghdr *rtm;
163 struct if_msghdr *ifm;
164 struct ifa_msghdr *ifam;
165 struct if_announcemsghdr *ifan;
166 struct client_lease *l;
167 time_t t = time(NULL);
168 struct sockaddr *sa;
169 struct iaddr a;
170 ssize_t n;
44967127 171 char *errmsg, buf[64];
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172
173 do {
174 n = read(routefd, &msg, sizeof(msg));
175 } while (n == -1 && errno == EINTR);
176
177 rtm = (struct rt_msghdr *)msg;
178 if (n < sizeof(rtm->rtm_msglen) || n < rtm->rtm_msglen ||
179 rtm->rtm_version != RTM_VERSION)
180 return;
181
182 switch (rtm->rtm_type) {
183 case RTM_NEWADDR:
184 ifam = (struct ifa_msghdr *)rtm;
185 if (ifam->ifam_index != ifi->index)
186 break;
187 if (findproto((char *)(ifam + 1), ifam->ifam_addrs) != AF_INET)
188 break;
189 sa = get_ifa((char *)(ifam + 1), ifam->ifam_addrs);
44967127
AHJ
190 if (sa == NULL) {
191 errmsg = "sa == NULL";
846204b6 192 goto die;
44967127 193 }
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HT
194
195 if ((a.len = sizeof(struct in_addr)) > sizeof(a.iabuf))
196 error("king bula sez: len mismatch");
197 memcpy(a.iabuf, &((struct sockaddr_in *)sa)->sin_addr, a.len);
198 if (addr_eq(a, defaddr))
199 break;
200
6954ee78
AHJ
201 /* state_panic() can try unexpired existing leases */
202 if (client->active && addr_eq(a, client->active->address))
203 break;
204 for (l = client->leases; l != NULL; l = l->next)
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205 if (addr_eq(a, l->address))
206 break;
207
7cbe3601 208 if (l != NULL)
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209 /* new addr is the one we set */
210 break;
44967127
AHJ
211 snprintf(buf, sizeof(buf), "%s: %s",
212 "new address not one we set", piaddr(a));
213 errmsg = buf;
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214 goto die;
215 case RTM_DELADDR:
216 ifam = (struct ifa_msghdr *)rtm;
217 if (ifam->ifam_index != ifi->index)
218 break;
219 if (findproto((char *)(ifam + 1), ifam->ifam_addrs) != AF_INET)
220 break;
6954ee78 221 /* XXX check addrs like RTM_NEWADDR instead of this? */
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222 if (scripttime == 0 || t < scripttime + 10)
223 break;
44967127 224 errmsg = "interface address deleted";
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225 goto die;
226 case RTM_IFINFO:
227 ifm = (struct if_msghdr *)rtm;
228 if (ifm->ifm_index != ifi->index)
229 break;
44967127
AHJ
230 if ((rtm->rtm_flags & RTF_UP) == 0) {
231 errmsg = "interface down";
846204b6 232 goto die;
44967127 233 }
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234
235 linkstat =
236 LINK_STATE_IS_UP(ifm->ifm_data.ifi_link_state) ? 1 : 0;
237 if (linkstat != ifi->linkstat) {
4cada237 238#ifdef DEBUG
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239 debug("link state %s -> %s",
240 ifi->linkstat ? "up" : "down",
241 linkstat ? "up" : "down");
4cada237 242#endif
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243 ifi->linkstat = interface_link_status(ifi->name);
244 if (ifi->linkstat) {
245 client->state = S_INIT;
246 state_reboot();
247 }
248 }
249 break;
250 case RTM_IFANNOUNCE:
251 ifan = (struct if_announcemsghdr *)rtm;
252 if (ifan->ifan_what == IFAN_DEPARTURE &&
44967127
AHJ
253 ifan->ifan_index == ifi->index) {
254 errmsg = "interface departure";
846204b6 255 goto die;
44967127 256 }
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HT
257 break;
258 default:
259 break;
260 }
261 return;
262
263die:
7cbe3601 264 script_init("FAIL");
846204b6 265 script_go();
44967127 266 error("routehandler: %s", errmsg);
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267}
268
269int
270main(int argc, char *argv[])
271{
272 int ch, fd, quiet = 0, i = 0, pipe_fd[2];
273 struct passwd *pw;
274
275 /* Initially, log errors to stderr as well as to syslogd. */
276 openlog(getprogname(), LOG_PID | LOG_NDELAY, DHCPD_LOG_FACILITY);
277 setlogmask(LOG_UPTO(LOG_INFO));
278
279 while ((ch = getopt(argc, argv, "c:dl:qu")) != -1)
280 switch (ch) {
281 case 'c':
282 path_dhclient_conf = optarg;
283 break;
284 case 'd':
285 no_daemon = 1;
286 break;
287 case 'l':
288 path_dhclient_db = optarg;
289 break;
290 case 'q':
291 quiet = 1;
292 break;
293 case 'u':
294 unknown_ok = 0;
295 break;
296 default:
297 usage();
298 }
299
300 argc -= optind;
301 argv += optind;
302
303 if (argc != 1)
304 usage();
305
306 ifi = calloc(1, sizeof(*ifi));
307 if (ifi == NULL)
308 error("ifi calloc");
309 client = calloc(1, sizeof(*client));
310 if (client == NULL)
311 error("client calloc");
312 config = calloc(1, sizeof(*config));
313 if (config == NULL)
314 error("config calloc");
315
d63fb838 316 get_ifname(ifi->name, argv[0]);
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HT
317 if (path_dhclient_db == NULL && asprintf(&path_dhclient_db, "%s.%s",
318 _PATH_DHCLIENT_DB, ifi->name) == -1)
319 error("asprintf");
320
321 if (quiet)
322 log_perror = 0;
323
324 tzset();
325 time(&cur_time);
326
327 memset(&sockaddr_broadcast, 0, sizeof(sockaddr_broadcast));
328 sockaddr_broadcast.sin_family = AF_INET;
329 sockaddr_broadcast.sin_port = htons(REMOTE_PORT);
330 sockaddr_broadcast.sin_addr.s_addr = INADDR_BROADCAST;
331 sockaddr_broadcast.sin_len = sizeof(sockaddr_broadcast);
332 inaddr_any.s_addr = INADDR_ANY;
333
334 read_client_conf();
335
336 if (interface_status(ifi->name) == 0) {
337 interface_link_forceup(ifi->name);
338 /* Give it up to 4 seconds of silent grace to find link */
339 i = -4;
340 } else
341 i = 0;
342
343 while (!(ifi->linkstat = interface_link_status(ifi->name))) {
344 if (i == 0)
345 fprintf(stderr, "%s: no link ...", ifi->name);
346 else if (i > 0)
347 fprintf(stderr, ".");
348 fflush(stderr);
349 if (++i > config->link_timeout) {
350 fprintf(stderr, " sleeping\n");
351 goto dispatch;
352 }
353 sleep(1);
846204b6 354 }
ade429c6 355 if (i > 0)
77a69a5f 356 fprintf(stderr, " got link\n");
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HT
357
358 dispatch:
359 if ((nullfd = open(_PATH_DEVNULL, O_RDWR, 0)) == -1)
360 error("cannot open %s: %m", _PATH_DEVNULL);
361
38623c79
AHJ
362 if ((pw = getpwnam("_dhcp")) == NULL)
363 error("no such user: _dhcp");
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HT
364
365 if (pipe(pipe_fd) == -1)
366 error("pipe");
367
368 fork_privchld(pipe_fd[0], pipe_fd[1]);
369
370 close(pipe_fd[0]);
371 privfd = pipe_fd[1];
372
373 if ((fd = open(path_dhclient_db, O_RDONLY|O_EXLOCK|O_CREAT, 0)) == -1)
374 error("can't open and lock %s: %m", path_dhclient_db);
375 read_client_leases();
376 if ((leaseFile = fopen(path_dhclient_db, "w")) == NULL)
377 error("can't open %s: %m", path_dhclient_db);
378 rewrite_client_leases();
379 close(fd);
380
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381 if ((routefd = socket(PF_ROUTE, SOCK_RAW, 0)) == -1)
382 error("socket(PF_ROUTE, SOCK_RAW): %m");
383
384 /* set up the interface */
385 discover_interface();
386
387 if (chroot(_PATH_VAREMPTY) == -1)
388 error("chroot");
389 if (chdir("/") == -1)
390 error("chdir(\"/\")");
391
392 if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1)
393 error("setresgid");
394 if (setgroups(1, &pw->pw_gid) == -1)
395 error("setgroups");
396 if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
397 error("setresuid");
398
399 endpwent();
400
401 setproctitle("%s", ifi->name);
402
403 if (ifi->linkstat) {
404 client->state = S_INIT;
405 state_reboot();
406 } else
407 go_daemon();
408
409 dispatch();
410
411 /* not reached */
412 return (0);
413}
414
415void
416usage(void)
417{
418 fprintf(stderr, "usage: %s [-dqu] [-c file] [-l file] interface\n",
419 getprogname());
420 exit(1);
421}
422
423/*
424 * Individual States:
425 *
426 * Each routine is called from the dhclient_state_machine() in one of
427 * these conditions:
428 * -> entering INIT state
429 * -> recvpacket_flag == 0: timeout in this state
430 * -> otherwise: received a packet in this state
431 *
432 * Return conditions as handled by dhclient_state_machine():
433 * Returns 1, sendpacket_flag = 1: send packet, reset timer.
434 * Returns 1, sendpacket_flag = 0: just reset the timer (wait for a milestone).
435 * Returns 0: finish the nap which was interrupted for no good reason.
436 *
437 * Several per-interface variables are used to keep track of the process:
438 * active_lease: the lease that is being used on the interface
439 * (null pointer if not configured yet).
440 * offered_leases: leases corresponding to DHCPOFFER messages that have
441 * been sent to us by DHCP servers.
442 * acked_leases: leases corresponding to DHCPACK messages that have been
443 * sent to us by DHCP servers.
444 * sendpacket: DHCP packet we're trying to send.
445 * destination: IP address to send sendpacket to
446 * In addition, there are several relevant per-lease variables.
447 * T1_expiry, T2_expiry, lease_expiry: lease milestones
448 * In the active lease, these control the process of renewing the lease;
449 * In leases on the acked_leases list, this simply determines when we
450 * can no longer legitimately use the lease.
451 */
452void
453state_reboot(void)
454{
455 /* If we don't remember an active lease, go straight to INIT. */
456 if (!client->active || client->active->is_bootp) {
457 state_init();
458 return;
459 }
460
461 /* We are in the rebooting state. */
462 client->state = S_REBOOTING;
463
464 /* make_request doesn't initialize xid because it normally comes
465 from the DHCPDISCOVER, but we haven't sent a DHCPDISCOVER,
466 so pick an xid now. */
467 client->xid = arc4random();
468
469 /* Make a DHCPREQUEST packet, and set appropriate per-interface
470 flags. */
471 make_request(client->active);
472 client->destination = iaddr_broadcast;
473 client->first_sending = cur_time;
601f8f90 474 client->interval = 0;
846204b6 475
846204b6
HT
476 /* Send out the first DHCPREQUEST packet. */
477 send_request();
478}
479
480/*
481 * Called when a lease has completely expired and we've
482 * been unable to renew it.
483 */
484void
485state_init(void)
486{
487 /* Make a DHCPDISCOVER packet, and set appropriate per-interface
488 flags. */
489 make_discover(client->active);
490 client->xid = client->packet.xid;
491 client->destination = iaddr_broadcast;
492 client->state = S_SELECTING;
493 client->first_sending = cur_time;
601f8f90 494 client->interval = 0;
846204b6
HT
495
496 /* Add an immediate timeout to cause the first DHCPDISCOVER packet
497 to go out. */
498 send_discover();
499}
500
501/*
502 * state_selecting is called when one or more DHCPOFFER packets
503 * have been received and a configurable period of time has passed.
504 */
505void
506state_selecting(void)
507{
508 struct client_lease *lp, *next, *picked;
509
510 /* Cancel state_selecting and send_discover timeouts, since either
511 one could have got us here. */
512 cancel_timeout(state_selecting);
513 cancel_timeout(send_discover);
514
515 /* We have received one or more DHCPOFFER packets. Currently,
516 the only criterion by which we judge leases is whether or
517 not we get a response when we arp for them. */
518 picked = NULL;
519 for (lp = client->offered_leases; lp; lp = next) {
520 next = lp->next;
521
846204b6 522 if (!picked) {
846204b6 523 picked = lp;
846204b6 524 } else {
7cbe3601
AHJ
525 make_decline(lp);
526 send_decline();
846204b6
HT
527 free_client_lease(lp);
528 }
529 }
530 client->offered_leases = NULL;
531
532 /* If we just tossed all the leases we were offered, go back
533 to square one. */
534 if (!picked) {
535 client->state = S_INIT;
536 state_init();
537 return;
538 }
7cbe3601 539 picked->next = NULL;
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540
541 /* If it was a BOOTREPLY, we can just take the address right now. */
542 if (!picked->options[DHO_DHCP_MESSAGE_TYPE].len) {
543 client->new = picked;
544
545 /* Make up some lease expiry times
546 XXX these should be configurable. */
547 client->new->expiry = cur_time + 12000;
548 client->new->renewal += cur_time + 8000;
549 client->new->rebind += cur_time + 10000;
550
551 client->state = S_REQUESTING;
552
553 /* Bind to the address we received. */
554 bind_lease();
555 return;
556 }
557
558 /* Go to the REQUESTING state. */
559 client->destination = iaddr_broadcast;
560 client->state = S_REQUESTING;
561 client->first_sending = cur_time;
601f8f90 562 client->interval = 0;
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HT
563
564 /* Make a DHCPREQUEST packet from the lease we picked. */
565 make_request(picked);
566 client->xid = client->packet.xid;
567
568 /* Toss the lease we picked - we'll get it back in a DHCPACK. */
569 free_client_lease(picked);
570
571 /* Add an immediate timeout to send the first DHCPREQUEST packet. */
572 send_request();
573}
574
575void
576dhcpack(struct iaddr client_addr, struct option_data *options)
577{
578 struct client_lease *lease;
579
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HT
580
581 if (client->state != S_REBOOTING &&
582 client->state != S_REQUESTING &&
583 client->state != S_RENEWING &&
584 client->state != S_REBINDING)
585 return;
586
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HT
587
588 lease = packet_to_lease(options);
589 if (!lease) {
590 note("packet_to_lease failed.");
591 return;
592 }
593
594 client->new = lease;
595
596 /* Stop resending DHCPREQUEST. */
597 cancel_timeout(send_request);
598
599 /* Figure out the lease time. */
600 if (client->new->options[DHO_DHCP_LEASE_TIME].data)
601 client->new->expiry =
602 getULong(client->new->options[DHO_DHCP_LEASE_TIME].data);
603 else
604 client->new->expiry = DEFAULT_LEASE_TIME;
605 /* A number that looks negative here is really just very large,
606 because the lease expiry offset is unsigned. */
607 if (client->new->expiry < 0)
608 client->new->expiry = TIME_MAX;
609 /* XXX should be fixed by resetting the client state */
610 if (client->new->expiry < 60)
611 client->new->expiry = 60;
612
613 /* Take the server-provided renewal time if there is one;
614 otherwise figure it out according to the spec. */
615 if (client->new->options[DHO_DHCP_RENEWAL_TIME].len)
616 client->new->renewal =
617 getULong(client->new->options[DHO_DHCP_RENEWAL_TIME].data);
618 else
619 client->new->renewal = client->new->expiry / 2;
620
621 /* Same deal with the rebind time. */
622 if (client->new->options[DHO_DHCP_REBINDING_TIME].len)
623 client->new->rebind =
624 getULong(client->new->options[DHO_DHCP_REBINDING_TIME].data);
625 else
626 client->new->rebind = client->new->renewal +
627 client->new->renewal / 2 + client->new->renewal / 4;
628
629 client->new->expiry += cur_time;
630 /* Lease lengths can never be negative. */
631 if (client->new->expiry < cur_time)
632 client->new->expiry = TIME_MAX;
633 client->new->renewal += cur_time;
634 if (client->new->renewal < cur_time)
635 client->new->renewal = TIME_MAX;
636 client->new->rebind += cur_time;
637 if (client->new->rebind < cur_time)
638 client->new->rebind = TIME_MAX;
639
640 bind_lease();
641}
642
643void
644bind_lease(void)
645{
846204b6
HT
646 /* Write out the new lease. */
647 write_client_lease(client->new, 0);
648
649 /* Run the client script with the new parameters. */
650 script_init((client->state == S_REQUESTING ? "BOUND" :
651 (client->state == S_RENEWING ? "RENEW" :
7cbe3601 652 (client->state == S_REBOOTING ? "REBOOT" : "REBIND"))));
846204b6
HT
653 if (client->active && client->state != S_REBOOTING)
654 script_write_params("old_", client->active);
655 script_write_params("new_", client->new);
846204b6
HT
656 script_go();
657
658 /* Replace the old active lease with the new one. */
659 if (client->active)
660 free_client_lease(client->active);
661 client->active = client->new;
662 client->new = NULL;
663
664 /* Set up a timeout to start the renewal process. */
665 add_timeout(client->active->renewal, state_bound);
666
667 note("bound to %s -- renewal in %ld seconds.",
668 piaddr(client->active->address),
669 client->active->renewal - cur_time);
670 client->state = S_BOUND;
671 reinitialize_interface();
672 go_daemon();
673}
674
675/*
676 * state_bound is called when we've successfully bound to a particular
677 * lease, but the renewal time on that lease has expired. We are
678 * expected to unicast a DHCPREQUEST to the server that gave us our
679 * original lease.
680 */
681void
682state_bound(void)
683{
684 /* T1 has expired. */
685 make_request(client->active);
686 client->xid = client->packet.xid;
687
688 if (client->active->options[DHO_DHCP_SERVER_IDENTIFIER].len == 4) {
689 memcpy(client->destination.iabuf,
690 client->active->options[DHO_DHCP_SERVER_IDENTIFIER].data,
691 4);
692 client->destination.len = 4;
693 } else
694 client->destination = iaddr_broadcast;
695
696 client->first_sending = cur_time;
601f8f90 697 client->interval = 0;
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698 client->state = S_RENEWING;
699
700 /* Send the first packet immediately. */
701 send_request();
702}
703
704void
705dhcpoffer(struct iaddr client_addr, struct option_data *options)
706{
707 struct client_lease *lease, *lp;
708 int i;
7cbe3601 709 int stop_selecting;
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710 char *name = options[DHO_DHCP_MESSAGE_TYPE].len ? "DHCPOFFER" :
711 "BOOTREPLY";
712
846204b6
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713
714 if (client->state != S_SELECTING)
715 return;
716
846204b6
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717
718 /* If this lease doesn't supply the minimum required parameters,
719 blow it off. */
720 for (i = 0; config->required_options[i]; i++) {
721 if (!options[config->required_options[i]].len) {
722 note("%s isn't satisfactory.", name);
723 return;
724 }
725 }
726
727 /* If we've already seen this lease, don't record it again. */
728 for (lease = client->offered_leases;
729 lease; lease = lease->next) {
730 if (lease->address.len == sizeof(client->packet.yiaddr) &&
731 !memcmp(lease->address.iabuf,
732 &client->packet.yiaddr, lease->address.len)) {
4cada237 733#ifdef DEBUG
846204b6 734 debug("%s already seen.", name);
4cada237 735#endif
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HT
736 return;
737 }
738 }
739
740 lease = packet_to_lease(options);
741 if (!lease) {
742 note("packet_to_lease failed.");
743 return;
744 }
745
746 /* If this lease was acquired through a BOOTREPLY, record that
747 fact. */
748 if (!options[DHO_DHCP_MESSAGE_TYPE].len)
749 lease->is_bootp = 1;
750
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751 /* Figure out when we're supposed to stop selecting. */
752 stop_selecting = client->first_sending + config->select_interval;
753
754 /* If this is the lease we asked for, put it at the head of the
755 list, and don't mess with the arp request timeout. */
c3b31e60 756 if (addr_eq(lease->address, client->requested_address)) {
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757 lease->next = client->offered_leases;
758 client->offered_leases = lease;
759 } else {
846204b6
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760 /* Put the lease at the end of the list. */
761 lease->next = NULL;
762 if (!client->offered_leases)
763 client->offered_leases = lease;
764 else {
765 for (lp = client->offered_leases; lp->next;
766 lp = lp->next)
767 ; /* nothing */
768 lp->next = lease;
769 }
770 }
771
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772 /* If the selecting interval has expired, go immediately to
773 state_selecting(). Otherwise, time out into
774 state_selecting at the select interval. */
601f8f90 775 if (stop_selecting <= cur_time)
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776 state_selecting();
777 else {
778 add_timeout(stop_selecting, state_selecting);
779 cancel_timeout(send_discover);
780 }
781}
782
783/*
784 * Allocate a client_lease structure and initialize it from the
785 * parameters in the specified packet.
786 */
787struct client_lease *
788packet_to_lease(struct option_data *options)
789{
790 struct client_lease *lease;
791 int i;
792
793 lease = malloc(sizeof(struct client_lease));
794
795 if (!lease) {
796 warning("dhcpoffer: no memory to record lease.");
797 return (NULL);
798 }
799
800 memset(lease, 0, sizeof(*lease));
801
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;
807 options[i].len = 0;
808 if (!check_option(lease, i)) {
809 warning("Invalid lease option - ignoring offer");
810 free_client_lease(lease);
811 return (NULL);
812 }
813 }
814 }
815
816 lease->address.len = sizeof(client->packet.yiaddr);
817 memcpy(lease->address.iabuf, &client->packet.yiaddr,
818 lease->address.len);
819
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);
828 return (NULL);
829 }
830 memcpy(lease->server_name, client->packet.sname,
831 DHCP_SNAME_LEN);
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;
837 }
838 }
839
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);
849 return (NULL);
850 }
851 memcpy(lease->filename, client->packet.file, DHCP_FILE_LEN);
852 lease->filename[DHCP_FILE_LEN] = '\0';
853 }
854 return lease;
855}
856
857void
858dhcpnak(struct iaddr client_addr, struct option_data *options)
859{
846204b6
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860
861 if (client->state != S_REBOOTING &&
862 client->state != S_REQUESTING &&
863 client->state != S_RENEWING &&
864 client->state != S_REBINDING)
865 return;
866
846204b6
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867
868 if (!client->active) {
869 note("DHCPNAK with no active lease.");
870 return;
871 }
872
873 free_client_lease(client->active);
874 client->active = NULL;
875
876 /* Stop sending DHCPREQUEST packets... */
877 cancel_timeout(send_request);
878
879 client->state = S_INIT;
880 state_init();
881}
882
883/*
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.
887 */
888void
889send_discover(void)
890{
891 int interval, increase = 1;
892
893 /* Figure out how long it's been since we started transmitting. */
894 interval = cur_time - client->first_sending;
895
896 /* If we're past the panic timeout, call the script and tell it
897 we haven't found anything for this interface yet. */
898 if (interval > config->timeout) {
899 state_panic();
900 return;
901 }
902
846204b6
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903 /*
904 * If we're supposed to increase the interval, do so. If it's
905 * currently zero (i.e., we haven't sent any packets yet), set
906 * it to initial_interval; otherwise, add to it a random
907 * number between zero and two times itself. On average, this
908 * means that it will double with every transmission.
909 */
910 if (increase) {
911 if (!client->interval)
912 client->interval = config->initial_interval;
913 else {
914 client->interval += (arc4random() >> 2) %
915 (2 * client->interval);
916 }
917
918 /* Don't backoff past cutoff. */
919 if (client->interval > config->backoff_cutoff)
920 client->interval = ((config->backoff_cutoff / 2)
921 + ((arc4random() >> 2) %
922 config->backoff_cutoff));
923 } else if (!client->interval)
924 client->interval = config->initial_interval;
925
926 /* If the backoff would take us to the panic timeout, just use that
927 as the interval. */
928 if (cur_time + client->interval >
929 client->first_sending + config->timeout)
930 client->interval = (client->first_sending +
931 config->timeout) - cur_time + 1;
932
933 /* Record the number of seconds since we started sending. */
934 if (interval < 65536)
935 client->packet.secs = htons(interval);
936 else
937 client->packet.secs = htons(65535);
938 client->secs = client->packet.secs;
939
940 note("DHCPDISCOVER on %s to %s port %d interval %ld",
941 ifi->name, inet_ntoa(sockaddr_broadcast.sin_addr),
942 ntohs(sockaddr_broadcast.sin_port), client->interval);
943
944 /* Send out a packet. */
945 send_packet(inaddr_any, &sockaddr_broadcast, NULL);
946
947 add_timeout(cur_time + client->interval, send_discover);
948}
949
950/*
951 * state_panic gets called if we haven't received any offers in a preset
952 * amount of time. When this happens, we try to use existing leases
953 * that haven't yet expired, and failing that, we call the client script
954 * and hope it can do something.
955 */
956void
957state_panic(void)
958{
959 struct client_lease *loop = client->active;
960 struct client_lease *lp;
961
962 note("No DHCPOFFERS received.");
963
964 /* We may not have an active lease, but we may have some
965 predefined leases that we can try. */
966 if (!client->active && client->leases)
967 goto activate_next;
968
969 /* Run through the list of leases and see if one can be used. */
970 while (client->active) {
971 if (client->active->expiry > cur_time) {
972 note("Trying recorded lease %s",
973 piaddr(client->active->address));
974 /* Run the client script with the existing
975 parameters. */
7cbe3601 976 script_init("TIMEOUT");
846204b6 977 script_write_params("new_", client->active);
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978
979 /* If the old lease is still good and doesn't
980 yet need renewal, go into BOUND state and
981 timeout at the renewal time. */
982 if (!script_go()) {
983 if (cur_time <
984 client->active->renewal) {
985 client->state = S_BOUND;
986 note("bound: renewal in %ld seconds.",
987 client->active->renewal -
988 cur_time);
989 add_timeout(client->active->renewal,
990 state_bound);
991 } else {
992 client->state = S_BOUND;
993 note("bound: immediate renewal.");
994 state_bound();
995 }
996 reinitialize_interface();
997 go_daemon();
998 return;
999 }
1000 }
1001
1002 /* If there are no other leases, give up. */
1003 if (!client->leases) {
1004 client->leases = client->active;
1005 client->active = NULL;
1006 break;
1007 }
1008
1009activate_next:
1010 /* Otherwise, put the active lease at the end of the
1011 lease list, and try another lease.. */
1012 for (lp = client->leases; lp->next; lp = lp->next)
1013 ;
1014 lp->next = client->active;
1015 if (lp->next)
1016 lp->next->next = NULL;
1017 client->active = client->leases;
1018 client->leases = client->leases->next;
1019
1020 /* If we already tried this lease, we've exhausted the
1021 set of leases, so we might as well give up for
1022 now. */
1023 if (client->active == loop)
1024 break;
1025 else if (!loop)
1026 loop = client->active;
1027 }
1028
1029 /* No leases were available, or what was available didn't work, so
1030 tell the shell script that we failed to allocate an address,
1031 and try again later. */
1032 note("No working leases in persistent database - sleeping.");
7cbe3601 1033 script_init("FAIL");
846204b6
HT
1034 script_go();
1035 client->state = S_INIT;
1036 add_timeout(cur_time + config->retry_interval, state_init);
1037 go_daemon();
1038}
1039
1040void
1041send_request(void)
1042{
1043 struct sockaddr_in destination;
1044 struct in_addr from;
1045 int interval;
1046
1047 /* Figure out how long it's been since we started transmitting. */
1048 interval = cur_time - client->first_sending;
1049
1050 /* If we're in the INIT-REBOOT or REQUESTING state and we're
1051 past the reboot timeout, go to INIT and see if we can
1052 DISCOVER an address... */
1053 /* XXX In the INIT-REBOOT state, if we don't get an ACK, it
1054 means either that we're on a network with no DHCP server,
1055 or that our server is down. In the latter case, assuming
1056 that there is a backup DHCP server, DHCPDISCOVER will get
1057 us a new address, but we could also have successfully
1058 reused our old address. In the former case, we're hosed
1059 anyway. This is not a win-prone situation. */
1060 if ((client->state == S_REBOOTING ||
1061 client->state == S_REQUESTING) &&
1062 interval > config->reboot_timeout) {
846204b6
HT
1063 client->state = S_INIT;
1064 cancel_timeout(send_request);
1065 state_init();
1066 return;
1067 }
1068
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1069 /* If the lease has expired, relinquish the address and go back
1070 to the INIT state. */
1071 if (client->state != S_REQUESTING &&
1072 cur_time > client->active->expiry) {
1073 /* Run the client script with the new parameters. */
7cbe3601 1074 script_init("EXPIRE");
846204b6 1075 script_write_params("old_", client->active);
846204b6
HT
1076 script_go();
1077
1078 client->state = S_INIT;
1079 state_init();
1080 return;
1081 }
1082
1083 /* Do the exponential backoff... */
1084 if (!client->interval)
1085 client->interval = config->initial_interval;
1086 else
1087 client->interval += ((arc4random() >> 2) %
1088 (2 * client->interval));
1089
1090 /* Don't backoff past cutoff. */
1091 if (client->interval > config->backoff_cutoff)
1092 client->interval = ((config->backoff_cutoff / 2) +
1093 ((arc4random() >> 2) % client->interval));
1094
1095 /* If the backoff would take us to the expiry time, just set the
1096 timeout to the expiry time. */
1097 if (client->state != S_REQUESTING && cur_time + client->interval >
1098 client->active->expiry)
1099 client->interval = client->active->expiry - cur_time + 1;
1100
1101 /* If the lease T2 time has elapsed, or if we're not yet bound,
1102 broadcast the DHCPREQUEST rather than unicasting. */
1103 memset(&destination, 0, sizeof(destination));
1104 if (client->state == S_REQUESTING ||
1105 client->state == S_REBOOTING ||
1106 cur_time > client->active->rebind)
1107 destination.sin_addr.s_addr = INADDR_BROADCAST;
1108 else
1109 memcpy(&destination.sin_addr.s_addr, client->destination.iabuf,
1110 sizeof(destination.sin_addr.s_addr));
1111 destination.sin_port = htons(REMOTE_PORT);
1112 destination.sin_family = AF_INET;
1113 destination.sin_len = sizeof(destination);
1114
1115 if (client->state != S_REQUESTING)
1116 memcpy(&from, client->active->address.iabuf, sizeof(from));
1117 else
1118 from.s_addr = INADDR_ANY;
1119
1120 /* Record the number of seconds since we started sending. */
1121 if (client->state == S_REQUESTING)
1122 client->packet.secs = client->secs;
1123 else {
1124 if (interval < 65536)
1125 client->packet.secs = htons(interval);
1126 else
1127 client->packet.secs = htons(65535);
1128 }
1129
1130 note("DHCPREQUEST on %s to %s port %d", ifi->name,
1131 inet_ntoa(destination.sin_addr), ntohs(destination.sin_port));
1132
1133 /* Send out a packet. */
1134 send_packet(from, &destination, NULL);
1135
1136 add_timeout(cur_time + client->interval, send_request);
1137}
1138
1139void
1140send_decline(void)
1141{
1142 note("DHCPDECLINE on %s to %s port %d", ifi->name,
1143 inet_ntoa(sockaddr_broadcast.sin_addr),
1144 ntohs(sockaddr_broadcast.sin_port));
1145
1146 /* Send out a packet. */
1147 send_packet(inaddr_any, &sockaddr_broadcast, NULL);
1148}
1149
1150void
1151make_discover(struct client_lease *lease)
1152{
1153 unsigned char discover = DHCPDISCOVER;
1154 struct option_data options[256];
1155 int i;
1156
1157 memset(options, 0, sizeof(options));
1158 memset(&client->packet, 0, sizeof(client->packet));
1159
1160 /* Set DHCP_MESSAGE_TYPE to DHCPDISCOVER */
1161 i = DHO_DHCP_MESSAGE_TYPE;
1162 options[i].data = &discover;
1163 options[i].len = sizeof(discover);
1164
1165 /* Request the options we want */
1166 i = DHO_DHCP_PARAMETER_REQUEST_LIST;
1167 options[i].data = config->requested_options;
1168 options[i].len = config->requested_option_count;
1169
1170 /* If we had an address, try to get it again. */
1171 if (lease) {
1172 client->requested_address = lease->address;
1173 i = DHO_DHCP_REQUESTED_ADDRESS;
1174 options[i].data = lease->address.iabuf;
1175 options[i].len = lease->address.len;
1176 } else
1177 client->requested_address.len = 0;
1178
1179 /* Send any options requested in the config file. */
1180 for (i = 0; i < 256; i++)
1181 if (!options[i].data &&
1182 config->send_options[i].data) {
1183 options[i].data = config->send_options[i].data;
1184 options[i].len = config->send_options[i].len;
1185 }
1186
1187 /* Set up the option buffer to fit in a minimal UDP packet. */
1188 i = cons_options(client->packet.options, 576 - DHCP_FIXED_LEN,
1189 options);
1190 if (i == -1 || client->packet.options[i] != DHO_END)
1191 error("options do not fit in DHCPDISCOVER packet.");
1192 client->packet_length = DHCP_FIXED_NON_UDP+i+1;
1193 if (client->packet_length < BOOTP_MIN_LEN)
1194 client->packet_length = BOOTP_MIN_LEN;
1195
1196 client->packet.op = BOOTREQUEST;
1197 client->packet.htype = ifi->hw_address.htype;
1198 client->packet.hlen = ifi->hw_address.hlen;
1199 client->packet.hops = 0;
1200 client->packet.xid = arc4random();
1201 client->packet.secs = 0; /* filled in by send_discover. */
1202 client->packet.flags = 0;
1203
1204 memset(&client->packet.ciaddr, 0, sizeof(client->packet.ciaddr));
1205 memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr));
1206 memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr));
1207 memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr));
1208 memcpy(client->packet.chaddr, ifi->hw_address.haddr,
1209 ifi->hw_address.hlen);
1210}
1211
1212void
1213make_request(struct client_lease * lease)
1214{
1215 unsigned char request = DHCPREQUEST;
1216 struct option_data options[256];
1217 int i;
1218
1219 memset(options, 0, sizeof(options));
1220 memset(&client->packet, 0, sizeof(client->packet));
1221
1222 /* Set DHCP_MESSAGE_TYPE to DHCPREQUEST */
1223 i = DHO_DHCP_MESSAGE_TYPE;
1224 options[i].data = &request;
1225 options[i].len = sizeof(request);
1226
1227 /* Request the options we want */
1228 i = DHO_DHCP_PARAMETER_REQUEST_LIST;
1229 options[i].data = config->requested_options;
1230 options[i].len = config->requested_option_count;
1231
1232 /* If we are requesting an address that hasn't yet been assigned
1233 to us, use the DHCP Requested Address option. */
1234 if (client->state == S_REQUESTING) {
1235 /* Send back the server identifier... */
1236 i = DHO_DHCP_SERVER_IDENTIFIER;
1237 options[i].data = lease->options[i].data;
1238 options[i].len = lease->options[i].len;
1239 }
1240 if (client->state == S_REQUESTING ||
1241 client->state == S_REBOOTING) {
1242 client->requested_address = lease->address;
1243 i = DHO_DHCP_REQUESTED_ADDRESS;
1244 options[i].data = lease->address.iabuf;
1245 options[i].len = lease->address.len;
1246 } else
1247 client->requested_address.len = 0;
1248
1249 /* Send any options requested in the config file. */
1250 for (i = 0; i < 256; i++)
1251 if (!options[i].data && config->send_options[i].data) {
1252 options[i].data = config->send_options[i].data;
1253 options[i].len = config->send_options[i].len;
1254 }
1255
1256 /* Set up the option buffer to fit in a minimal UDP packet. */
1257 i = cons_options(client->packet.options, 576 - DHCP_FIXED_LEN,
1258 options);
1259 if (i == -1 || client->packet.options[i] != DHO_END)
1260 error("options do not fit in DHCPREQUEST packet.");
1261 client->packet_length = DHCP_FIXED_NON_UDP+i+1;
1262 if (client->packet_length < BOOTP_MIN_LEN)
1263 client->packet_length = BOOTP_MIN_LEN;
1264
1265 client->packet.op = BOOTREQUEST;
1266 client->packet.htype = ifi->hw_address.htype;
1267 client->packet.hlen = ifi->hw_address.hlen;
1268 client->packet.hops = 0;
1269 client->packet.xid = client->xid;
1270 client->packet.secs = 0; /* Filled in by send_request. */
1271 client->packet.flags = 0;
1272
1273 /* If we own the address we're requesting, put it in ciaddr;
1274 otherwise set ciaddr to zero. */
1275 if (client->state == S_BOUND ||
1276 client->state == S_RENEWING ||
1277 client->state == S_REBINDING) {
1278 memcpy(&client->packet.ciaddr,
1279 lease->address.iabuf, lease->address.len);
1280 } else {
1281 memset(&client->packet.ciaddr, 0,
1282 sizeof(client->packet.ciaddr));
1283 }
1284
1285 memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr));
1286 memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr));
1287 memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr));
1288 memcpy(client->packet.chaddr, ifi->hw_address.haddr,
1289 ifi->hw_address.hlen);
1290}
1291
1292void
1293make_decline(struct client_lease *lease)
1294{
1295 struct option_data options[256];
1296 unsigned char decline = DHCPDECLINE;
1297 int i;
1298
1299 memset(options, 0, sizeof(options));
1300 memset(&client->packet, 0, sizeof(client->packet));
1301
1302 /* Set DHCP_MESSAGE_TYPE to DHCPDECLINE */
1303 i = DHO_DHCP_MESSAGE_TYPE;
1304 options[i].data = &decline;
1305 options[i].len = sizeof(decline);
1306
1307 /* Send back the server identifier... */
1308 i = DHO_DHCP_SERVER_IDENTIFIER;
1309 options[i].data = lease->options[i].data;
1310 options[i].len = lease->options[i].len;
1311
1312 /* Send back the address we're declining. */
1313 i = DHO_DHCP_REQUESTED_ADDRESS;
1314 options[i].data = lease->address.iabuf;
1315 options[i].len = lease->address.len;
1316
1317 /* Send the uid if the user supplied one. */
1318 i = DHO_DHCP_CLIENT_IDENTIFIER;
1319 if (config->send_options[i].len) {
1320 options[i].data = config->send_options[i].data;
1321 options[i].len = config->send_options[i].len;
1322 }
1323
1324 /* Set up the option buffer to fit in a minimal UDP packet. */
1325 i = cons_options(client->packet.options, 576 - DHCP_FIXED_LEN,
1326 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;
1332
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;
1340
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);
1348}
1349
1350void
1351free_client_lease(struct client_lease *lease)
1352{
1353 int i;
1354
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);
1362 }
1363 free(lease);
1364}
1365
1366void
1367rewrite_client_leases(void)
1368{
1369 struct client_lease *lp;
1370
1371 if (!leaseFile) /* XXX */
1372 error("lease file not open");
1373
1374 fflush(leaseFile);
1375 rewind(leaseFile);
1376
1377 for (lp = client->leases; lp; lp = lp->next)
1378 write_client_lease(lp, 1);
1379 if (client->active)
1380 write_client_lease(client->active, 1);
1381
1382 fflush(leaseFile);
1383 ftruncate(fileno(leaseFile), ftello(leaseFile));
1384 fsync(fileno(leaseFile));
1385}
1386
1387void
1388write_client_lease(struct client_lease *lease, int rewrite)
1389{
1390 static int leases_written;
1391 struct tm *t;
1392 int i;
1393
1394 if (!rewrite) {
1395 if (leases_written++ > 20) {
1396 rewrite_client_leases();
1397 leases_written = 0;
1398 }
1399 }
1400
1401 /* If the lease came from the config file, we don't need to stash
1402 a copy in the lease database. */
1403 if (lease->is_static)
1404 return;
1405
1406 if (!leaseFile) /* XXX */
1407 error("lease file not open");
1408
1409 fprintf(leaseFile, "lease {\n");
1410 if (lease->is_bootp)
1411 fprintf(leaseFile, " bootp;\n");
1412 fprintf(leaseFile, " interface \"%s\";\n", ifi->name);
1413 fprintf(leaseFile, " fixed-address %s;\n", piaddr(lease->address));
1414 if (lease->filename)
1415 fprintf(leaseFile, " filename \"%s\";\n", lease->filename);
1416 if (lease->server_name)
1417 fprintf(leaseFile, " server-name \"%s\";\n",
1418 lease->server_name);
846204b6
HT
1419 for (i = 0; i < 256; i++)
1420 if (lease->options[i].len)
1421 fprintf(leaseFile, " option %s %s;\n",
1422 dhcp_options[i].name,
1423 pretty_print_option(i, lease->options[i].data,
1424 lease->options[i].len, 1, 1));
1425
1426 t = gmtime(&lease->renewal);
1427 fprintf(leaseFile, " renew %d %d/%d/%d %02d:%02d:%02d;\n",
1428 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
1429 t->tm_hour, t->tm_min, t->tm_sec);
1430 t = gmtime(&lease->rebind);
1431 fprintf(leaseFile, " rebind %d %d/%d/%d %02d:%02d:%02d;\n",
1432 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
1433 t->tm_hour, t->tm_min, t->tm_sec);
1434 t = gmtime(&lease->expiry);
1435 fprintf(leaseFile, " expire %d %d/%d/%d %02d:%02d:%02d;\n",
1436 t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
1437 t->tm_hour, t->tm_min, t->tm_sec);
1438 fprintf(leaseFile, "}\n");
1439 fflush(leaseFile);
1440}
1441
1442void
7cbe3601 1443script_init(char *reason)
846204b6 1444{
7cbe3601 1445 size_t len;
846204b6
HT
1446 struct imsg_hdr hdr;
1447 struct buf *buf;
1448
846204b6 1449 hdr.code = IMSG_SCRIPT_INIT;
7cbe3601 1450 hdr.len = sizeof(struct imsg_hdr) + sizeof(size_t) + strlen(reason);
846204b6
HT
1451 buf = buf_open(hdr.len);
1452
1453 buf_add(buf, &hdr, sizeof(hdr));
846204b6
HT
1454 len = strlen(reason);
1455 buf_add(buf, &len, sizeof(len));
1456 buf_add(buf, reason, len);
1457
1458 buf_close(privfd, buf);
1459}
1460
1461void
7cbe3601 1462priv_script_init(char *reason)
846204b6
HT
1463{
1464 client->scriptEnvsize = 100;
1465 if (client->scriptEnv == NULL)
1466 client->scriptEnv =
1467 calloc(client->scriptEnvsize, sizeof(char *));
1468 if (client->scriptEnv == NULL)
1469 error("script_init: no memory for environment");
1470
1471 client->scriptEnv[0] = strdup(CLIENT_PATH);
1472 if (client->scriptEnv[0] == NULL)
1473 error("script_init: no memory for environment");
1474
1475 client->scriptEnv[1] = NULL;
1476
1477 script_set_env("", "interface", ifi->name);
1478
846204b6
HT
1479 script_set_env("", "reason", reason);
1480}
1481
1482void
1483priv_script_write_params(char *prefix, struct client_lease *lease)
1484{
1485 u_int8_t dbuf[1500];
1486 int i, len = 0;
1487 char tbuf[128];
1488
1489 script_set_env(prefix, "ip_address", piaddr(lease->address));
1490
1491 if (lease->options[DHO_SUBNET_MASK].len &&
1492 (lease->options[DHO_SUBNET_MASK].len <
1493 sizeof(lease->address.iabuf))) {
1494 struct iaddr netmask, subnet, broadcast;
1495
1496 memcpy(netmask.iabuf, lease->options[DHO_SUBNET_MASK].data,
1497 lease->options[DHO_SUBNET_MASK].len);
1498 netmask.len = lease->options[DHO_SUBNET_MASK].len;
1499
1500 subnet = subnet_number(lease->address, netmask);
1501 if (subnet.len) {
1502 script_set_env(prefix, "network_number",
1503 piaddr(subnet));
1504 if (!lease->options[DHO_BROADCAST_ADDRESS].len) {
1505 broadcast = broadcast_addr(subnet, netmask);
1506 if (broadcast.len)
1507 script_set_env(prefix,
1508 "broadcast_address",
1509 piaddr(broadcast));
1510 }
1511 }
1512 }
1513
1514 if (lease->filename)
1515 script_set_env(prefix, "filename", lease->filename);
1516 if (lease->server_name)
1517 script_set_env(prefix, "server_name",
1518 lease->server_name);
1519 for (i = 0; i < 256; i++) {
1520 u_int8_t *dp = NULL;
1521
1522 if (config->defaults[i].len) {
1523 if (lease->options[i].len) {
1524 switch (config->default_actions[i]) {
1525 case ACTION_DEFAULT:
1526 dp = lease->options[i].data;
1527 len = lease->options[i].len;
1528 break;
1529 case ACTION_SUPERSEDE:
1530supersede:
1531 dp = config->defaults[i].data;
1532 len = config->defaults[i].len;
1533 break;
1534 case ACTION_PREPEND:
1535 len = config->defaults[i].len +
1536 lease->options[i].len;
c1b95e62 1537 if (len >= sizeof(dbuf)) {
846204b6
HT
1538 warning("no space to %s %s",
1539 "prepend option",
1540 dhcp_options[i].name);
1541 goto supersede;
1542 }
1543 dp = dbuf;
1544 memcpy(dp,
1545 config->defaults[i].data,
1546 config->defaults[i].len);
1547 memcpy(dp +
1548 config->defaults[i].len,
1549 lease->options[i].data,
1550 lease->options[i].len);
1551 dp[len] = '\0';
1552 break;
1553 case ACTION_APPEND:
1554 len = config->defaults[i].len +
1555 lease->options[i].len;
c1b95e62 1556 if (len >= sizeof(dbuf)) {
846204b6
HT
1557 warning("no space to %s %s",
1558 "append option",
1559 dhcp_options[i].name);
1560 goto supersede;
1561 }
1562 dp = dbuf;
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);
1568 dp[len] = '\0';
1569 }
1570 } else {
1571 dp = config->defaults[i].data;
1572 len = config->defaults[i].len;
1573 }
1574 } else if (lease->options[i].len) {
1575 len = lease->options[i].len;
1576 dp = lease->options[i].data;
1577 } else {
1578 len = 0;
1579 }
1580 if (len) {
1581 char name[256];
1582
1583 if (dhcp_option_ev_name(name, sizeof(name),
1584 &dhcp_options[i]))
1585 script_set_env(prefix, name,
1586 pretty_print_option(i, dp, len, 0, 0));
1587 }
1588 }
1589 snprintf(tbuf, sizeof(tbuf), "%d", (int)lease->expiry);
1590 script_set_env(prefix, "expiry", tbuf);
1591}
1592
1593void
1594script_write_params(char *prefix, struct client_lease *lease)
1595{
1596 size_t fn_len = 0, sn_len = 0, pr_len = 0;
1597 struct imsg_hdr hdr;
1598 struct buf *buf;
1599 int i;
1600
1601 if (lease->filename != NULL)
1602 fn_len = strlen(lease->filename);
1603 if (lease->server_name != NULL)
1604 sn_len = strlen(lease->server_name);
1605 if (prefix != NULL)
1606 pr_len = strlen(prefix);
1607
1608 hdr.code = IMSG_SCRIPT_WRITE_PARAMS;
1609 hdr.len = sizeof(hdr) + sizeof(struct client_lease) +
1610 sizeof(size_t) + fn_len + sizeof(size_t) + sn_len +
1611 sizeof(size_t) + pr_len;
1612
1613 for (i = 0; i < 256; i++)
1614 hdr.len += sizeof(int) + lease->options[i].len;
1615
1616 scripttime = time(NULL);
1617
1618 buf = buf_open(hdr.len);
1619
1620 buf_add(buf, &hdr, sizeof(hdr));
1621 buf_add(buf, lease, sizeof(struct client_lease));
1622 buf_add(buf, &fn_len, sizeof(fn_len));
1623 buf_add(buf, lease->filename, fn_len);
1624 buf_add(buf, &sn_len, sizeof(sn_len));
1625 buf_add(buf, lease->server_name, sn_len);
1626 buf_add(buf, &pr_len, sizeof(pr_len));
1627 buf_add(buf, prefix, pr_len);
1628
1629 for (i = 0; i < 256; i++) {
1630 buf_add(buf, &lease->options[i].len,
1631 sizeof(lease->options[i].len));
1632 buf_add(buf, lease->options[i].data,
1633 lease->options[i].len);
1634 }
1635
1636 buf_close(privfd, buf);
1637}
1638
1639int
1640script_go(void)
1641{
1642 struct imsg_hdr hdr;
1643 struct buf *buf;
1644 int ret;
1645
1646 scripttime = time(NULL);
1647
1648 hdr.code = IMSG_SCRIPT_GO;
1649 hdr.len = sizeof(struct imsg_hdr);
1650
1651 buf = buf_open(hdr.len);
1652
1653 buf_add(buf, &hdr, sizeof(hdr));
1654 buf_close(privfd, buf);
1655
1656 bzero(&hdr, sizeof(hdr));
1657 buf_read(privfd, &hdr, sizeof(hdr));
1658 if (hdr.code != IMSG_SCRIPT_GO_RET)
1659 error("unexpected msg type %u", hdr.code);
1660 if (hdr.len != sizeof(hdr) + sizeof(int))
1661 error("received corrupted message");
1662 buf_read(privfd, &ret, sizeof(ret));
1663
1664 return (ret);
1665}
1666
1667int
1668priv_script_go(void)
1669{
1670 char *scriptName, *argv[2], **envp;
1671 int pid, wpid, wstatus;
1672
1673 scripttime = time(NULL);
1674
1675 scriptName = config->script_name;
1676 envp = client->scriptEnv;
1677
1678 argv[0] = scriptName;
1679 argv[1] = NULL;
1680
1681 pid = fork();
1682 if (pid < 0) {
1683 error("fork: %m");
1684 wstatus = 0;
1685 } else if (pid) {
1686 do {
1687 wpid = wait(&wstatus);
1688 } while (wpid != pid && wpid > 0);
1689 if (wpid < 0) {
1690 error("wait: %m");
1691 wstatus = 0;
1692 }
1693 } else {
1694 execve(scriptName, argv, envp);
1695 error("execve (%s, ...): %m", scriptName);
1696 }
1697
1698 script_flush_env();
1699
1700 return (WEXITSTATUS(wstatus));
1701}
1702
1703void
1704script_set_env(const char *prefix, const char *name, const char *value)
1705{
1706 int i, j, namelen;
1707
1708 namelen = strlen(name);
1709
1710 for (i = 0; client->scriptEnv[i]; i++)
1711 if (strncmp(client->scriptEnv[i], name, namelen) == 0 &&
1712 client->scriptEnv[i][namelen] == '=')
1713 break;
1714
1715 if (client->scriptEnv[i])
1716 /* Reuse the slot. */
1717 free(client->scriptEnv[i]);
1718 else {
1719 /* New variable. Expand if necessary. */
1720 if (i >= client->scriptEnvsize - 1) {
1721 char **newscriptEnv;
1722 int newscriptEnvsize = client->scriptEnvsize + 50;
1723
1724 newscriptEnv = realloc(client->scriptEnv,
1725 newscriptEnvsize);
1726 if (newscriptEnv == NULL) {
1727 free(client->scriptEnv);
1728 client->scriptEnv = NULL;
1729 client->scriptEnvsize = 0;
1730 error("script_set_env: no memory for variable");
1731 }
1732 client->scriptEnv = newscriptEnv;
1733 client->scriptEnvsize = newscriptEnvsize;
1734 }
1735 /* need to set the NULL pointer at end of array beyond
1736 the new slot. */
1737 client->scriptEnv[i + 1] = NULL;
1738 }
1739 /* Allocate space and format the variable in the appropriate slot. */
1740 client->scriptEnv[i] = malloc(strlen(prefix) + strlen(name) + 1 +
1741 strlen(value) + 1);
1742 if (client->scriptEnv[i] == NULL)
1743 error("script_set_env: no memory for variable assignment");
1744
1745 /* No `` or $() command substitution allowed in environment values! */
1746 for (j = 0; j < strlen(value); j++)
1747 switch (value[j]) {
1748 case '`':
1749 case '$':
1750 error("illegal character (%c) in value '%s'", value[j],
1751 value);
1752 /* not reached */
1753 }
1754 snprintf(client->scriptEnv[i], strlen(prefix) + strlen(name) +
1755 1 + strlen(value) + 1, "%s%s=%s", prefix, name, value);
1756}
1757
1758void
1759script_flush_env(void)
1760{
1761 int i;
1762
1763 for (i = 0; client->scriptEnv[i]; i++) {
1764 free(client->scriptEnv[i]);
1765 client->scriptEnv[i] = NULL;
1766 }
1767 client->scriptEnvsize = 0;
1768}
1769
1770int
1771dhcp_option_ev_name(char *buf, size_t buflen, const struct option *option)
1772{
1773 size_t i;
1774
1775 for (i = 0; option->name[i]; i++) {
1776 if (i + 1 == buflen)
1777 return 0;
1778 if (option->name[i] == '-')
1779 buf[i] = '_';
1780 else
1781 buf[i] = option->name[i];
1782 }
1783
1784 buf[i] = 0;
1785 return 1;
1786}
1787
1788void
1789go_daemon(void)
1790{
1791 static int state = 0;
1792
1793 if (no_daemon || state)
1794 return;
1795
1796 state = 1;
1797
1798 /* Stop logging to stderr... */
1799 log_perror = 0;
1800
1801 if (daemon(1, 0) == -1)
1802 error("daemon");
1803
1804 /* we are chrooted, daemon(3) fails to open /dev/null */
1805 if (nullfd != -1) {
1806 dup2(nullfd, STDIN_FILENO);
1807 dup2(nullfd, STDOUT_FILENO);
1808 dup2(nullfd, STDERR_FILENO);
1809 close(nullfd);
1810 nullfd = -1;
1811 }
1812}
1813
1814int
1815check_option(struct client_lease *l, int option)
1816{
1817 char *opbuf;
1818 char *sbuf;
1819
1820 /* we use this, since this is what gets passed to dhclient-script */
1821
1822 opbuf = pretty_print_option(option, l->options[option].data,
1823 l->options[option].len, 0, 0);
1824
1825 sbuf = option_as_string(option, l->options[option].data,
1826 l->options[option].len);
1827
1828 switch (option) {
1829 case DHO_SUBNET_MASK:
313ef36c
AHJ
1830 case DHO_SWAP_SERVER:
1831 case DHO_BROADCAST_ADDRESS:
1832 case DHO_DHCP_SERVER_IDENTIFIER:
1833 case DHO_ROUTER_SOLICITATION_ADDRESS:
1834 case DHO_DHCP_REQUESTED_ADDRESS:
1835 if (ipv4addrs(opbuf) == 0) {
1836 warning("Invalid IP address in option %s: %s",
1837 dhcp_options[option].name, opbuf);
1838 return (0);
1839 }
1840 if (l->options[option].len != 4) { /* RFC 2132 */
1841 warning("warning: Only 1 IP address allowed in "
1842 "%s option; length %d, must be 4",
1843 dhcp_options[option].name,
1844 l->options[option].len);
1845 l->options[option].len = 4;
1846 }
1847 return (1);
846204b6
HT
1848 case DHO_TIME_SERVERS:
1849 case DHO_NAME_SERVERS:
1850 case DHO_ROUTERS:
1851 case DHO_DOMAIN_NAME_SERVERS:
1852 case DHO_LOG_SERVERS:
1853 case DHO_COOKIE_SERVERS:
1854 case DHO_LPR_SERVERS:
1855 case DHO_IMPRESS_SERVERS:
1856 case DHO_RESOURCE_LOCATION_SERVERS:
846204b6
HT
1857 case DHO_NIS_SERVERS:
1858 case DHO_NTP_SERVERS:
1859 case DHO_NETBIOS_NAME_SERVERS:
1860 case DHO_NETBIOS_DD_SERVER:
1861 case DHO_FONT_SERVERS:
313ef36c
AHJ
1862 if (ipv4addrs(opbuf) == 0) {
1863 warning("Invalid IP address in option %s: %s",
1864 dhcp_options[option].name, opbuf);
846204b6
HT
1865 return (0);
1866 }
1867 return (1);
1868 case DHO_HOST_NAME:
1869 case DHO_DOMAIN_NAME:
1870 case DHO_NIS_DOMAIN:
1871 if (!res_hnok(sbuf)) {
1872 warning("Bogus Host Name option %d: %s (%s)", option,
1873 sbuf, opbuf);
1874 l->options[option].len = 0;
1875 free(l->options[option].data);
1876 }
1877 return (1);
1878 case DHO_PAD:
1879 case DHO_TIME_OFFSET:
1880 case DHO_BOOT_SIZE:
1881 case DHO_MERIT_DUMP:
1882 case DHO_ROOT_PATH:
1883 case DHO_EXTENSIONS_PATH:
1884 case DHO_IP_FORWARDING:
1885 case DHO_NON_LOCAL_SOURCE_ROUTING:
1886 case DHO_POLICY_FILTER:
1887 case DHO_MAX_DGRAM_REASSEMBLY:
1888 case DHO_DEFAULT_IP_TTL:
1889 case DHO_PATH_MTU_AGING_TIMEOUT:
1890 case DHO_PATH_MTU_PLATEAU_TABLE:
1891 case DHO_INTERFACE_MTU:
1892 case DHO_ALL_SUBNETS_LOCAL:
1893 case DHO_PERFORM_MASK_DISCOVERY:
1894 case DHO_MASK_SUPPLIER:
1895 case DHO_ROUTER_DISCOVERY:
846204b6
HT
1896 case DHO_STATIC_ROUTES:
1897 case DHO_TRAILER_ENCAPSULATION:
1898 case DHO_ARP_CACHE_TIMEOUT:
1899 case DHO_IEEE802_3_ENCAPSULATION:
1900 case DHO_DEFAULT_TCP_TTL:
1901 case DHO_TCP_KEEPALIVE_INTERVAL:
1902 case DHO_TCP_KEEPALIVE_GARBAGE:
1903 case DHO_VENDOR_ENCAPSULATED_OPTIONS:
1904 case DHO_NETBIOS_NODE_TYPE:
1905 case DHO_NETBIOS_SCOPE:
1906 case DHO_X_DISPLAY_MANAGER:
846204b6
HT
1907 case DHO_DHCP_LEASE_TIME:
1908 case DHO_DHCP_OPTION_OVERLOAD:
1909 case DHO_DHCP_MESSAGE_TYPE:
1910 case DHO_DHCP_PARAMETER_REQUEST_LIST:
1911 case DHO_DHCP_MESSAGE:
1912 case DHO_DHCP_MAX_MESSAGE_SIZE:
1913 case DHO_DHCP_RENEWAL_TIME:
1914 case DHO_DHCP_REBINDING_TIME:
1915 case DHO_DHCP_CLASS_IDENTIFIER:
1916 case DHO_DHCP_CLIENT_IDENTIFIER:
1917 case DHO_DHCP_USER_CLASS_ID:
7a6ba664 1918 case DHO_TFTP_SERVER:
846204b6
HT
1919 case DHO_END:
1920 return (1);
1921 default:
b796b237
AHJ
1922 if (!unknown_ok)
1923 warning("unknown dhcp option value 0x%x", option);
846204b6
HT
1924 return (unknown_ok);
1925 }
1926}
1927
1928int
1929res_hnok(const char *name)
1930{
1931 const char *dn = name;
1932 int pch = '.', ch = *dn++;
1933 int warn = 0;
1934
1935 while (ch != '\0') {
1936 int nch = *dn++;
1937
1938 if (ch == '.') {
1939 ;
1940 } else if (pch == '.' || nch == '.' || nch == '\0') {
1941 if (!isalnum(ch))
1942 return (0);
1943 } else if (!isalnum(ch) && ch != '-' && ch != '_')
1944 return (0);
1945 else if (ch == '_' && warn == 0) {
1946 warning("warning: hostname %s contains an "
1947 "underscore which violates RFC 952", name);
1948 warn++;
1949 }
1950 pch = ch, ch = nch;
1951 }
1952 return (1);
1953}
1954
1955/* Does buf consist only of dotted decimal ipv4 addrs?
1956 * return how many if so,
1957 * otherwise, return 0
1958 */
1959int
1960ipv4addrs(char * buf)
1961{
1962 struct in_addr jnk;
1963 int count = 0;
1964
1965 while (inet_aton(buf, &jnk) == 1){
1966 count++;
1967 while (*buf == '.' || isdigit(*buf))
1968 buf++;
1969 if (*buf == '\0')
1970 return (count);
1971 while (*buf == ' ')
1972 buf++;
1973 }
1974 return (0);
1975}
1976
1977char *
1978option_as_string(unsigned int code, unsigned char *data, int len)
1979{
1980 static char optbuf[32768]; /* XXX */
1981 char *op = optbuf;
1982 int opleft = sizeof(optbuf);
1983 unsigned char *dp = data;
1984
1985 if (code > 255)
1986 error("option_as_string: bad code %d", code);
1987
1988 for (; dp < data + len; dp++) {
1989 if (!isascii(*dp) || !isprint(*dp)) {
1990 if (dp + 1 != data + len || *dp != 0) {
1991 size_t oplen;
1992 snprintf(op, opleft, "\\%03o", *dp);
1993 oplen = strlen(op);
1994 op += oplen;
1995 opleft -= oplen;
1996 }
1997 } else if (*dp == '"' || *dp == '\'' || *dp == '$' ||
1998 *dp == '`' || *dp == '\\') {
1999 *op++ = '\\';
2000 *op++ = *dp;
2001 opleft -= 2;
2002 } else {
2003 *op++ = *dp;
2004 opleft--;
2005 }
2006 }
2007 if (opleft < 1)
2008 goto toobig;
2009 *op = 0;
2010 return optbuf;
2011toobig:
2012 warning("dhcp option too large");
2013 return "<error>";
2014}
2015
2016int
2017fork_privchld(int fd, int fd2)
2018{
2019 struct pollfd pfd[1];
a05d48e6 2020 int nfds, pfail = 0;
846204b6
HT
2021
2022 switch (fork()) {
2023 case -1:
2024 error("cannot fork");
2025 break;
2026 case 0:
2027 break;
2028 default:
2029 return (0);
2030 }
2031
2032 if (chdir("/") == -1)
2033 error("chdir(\"/\")");
2034
2035 setproctitle("%s [priv]", ifi->name);
2036
2037 dup2(nullfd, STDIN_FILENO);
2038 dup2(nullfd, STDOUT_FILENO);
2039 dup2(nullfd, STDERR_FILENO);
2040 close(nullfd);
2041 close(fd2);
2042
2043 for (;;) {
2044 pfd[0].fd = fd;
2045 pfd[0].events = POLLIN;
2046 if ((nfds = poll(pfd, 1, INFTIM)) == -1)
2047 if (errno != EINTR)
2048 error("poll error");
2049
a05d48e6
SG
2050 /*
2051 * Handle temporary errors, but bail if they persist.
2052 */
2053 if (nfds == 0 || !(pfd[0].revents & POLLIN)) {
2054 if (pfail > POLL_FAILURES)
2055 error("poll failed > %d times", POLL_FAILURES);
2056 sleep(pfail * POLL_FAILURE_WAIT);
2057 pfail++;
846204b6 2058 continue;
a05d48e6 2059 }
846204b6
HT
2060
2061 dispatch_imsg(fd);
2062 }
2063}
d63fb838
AHJ
2064
2065void
2066get_ifname(char *ifname, char *arg)
2067{
2068 struct ifgroupreq ifgr;
2069 struct ifg_req *ifg;
2070 int s, len;
2071
2072 if (!strcmp(arg, "egress")) {
2073 s = socket(AF_INET, SOCK_DGRAM, 0);
2074 if (s == -1)
2075 error("socket error");
2076 bzero(&ifgr, sizeof(ifgr));
2077 strlcpy(ifgr.ifgr_name, "egress", sizeof(ifgr.ifgr_name));
2078 if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1) {
2079 if (errno == ENOENT)
2080 error("no interface in group egress found");
2081 error("ioctl SIOCGIFGMEMB: %m");
2082 }
2083 len = ifgr.ifgr_len;
2084 if ((ifgr.ifgr_groups = calloc(1, len)) == NULL)
2085 error("get_ifname");
2086 if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1)
2087 error("ioctl SIOCGIFGMEMB: %m");
2088
2089 arg = NULL;
2090 for (ifg = ifgr.ifgr_groups;
2091 ifg && len >= sizeof(struct ifg_req); ifg++) {
2092 len -= sizeof(struct ifg_req);
2093 if (arg)
2094 error("too many interfaces in group egress");
2095 arg = ifg->ifgrq_member;
2096 }
2097
2098 if (strlcpy(ifi->name, arg, IFNAMSIZ) >= IFNAMSIZ)
2099 error("Interface name too long: %m");
2100
2101 free(ifgr.ifgr_groups);
2102 close(s);
2103 } else if (strlcpy(ifi->name, arg, IFNAMSIZ) >= IFNAMSIZ)
2104 error("Interface name too long");
2105}