Commit | Line | Data |
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377552a8 | 1 | /* $OpenBSD: src/sbin/dhclient/dhclient.c,v 1.142 2011/12/10 15:55:43 krw 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 | */ | |
f96419f4 | 55 | #include <sys/ioctl.h> |
846204b6 HT |
56 | |
57 | #include <ctype.h> | |
58 | #include <poll.h> | |
59 | #include <pwd.h> | |
a05d48e6 | 60 | #include <unistd.h> |
846204b6 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) */ | |
846204b6 HT |
70 | |
71 | time_t cur_time; | |
72 | ||
73 | char *path_dhclient_conf = _PATH_DHCLIENT_CONF; | |
74 | char *path_dhclient_db = NULL; | |
75 | ||
76 | int log_perror = 1; | |
77 | int privfd; | |
78 | int nullfd = -1; | |
79 | int no_daemon; | |
80 | int unknown_ok = 1; | |
81 | int routefd = -1; | |
82 | ||
83 | struct iaddr iaddr_broadcast = { 4, { 255, 255, 255, 255 } }; | |
84 | struct in_addr inaddr_any; | |
85 | struct sockaddr_in sockaddr_broadcast; | |
86 | ||
87 | struct interface_info *ifi; | |
88 | struct client_state *client; | |
89 | struct client_config *config; | |
90 | ||
91 | int findproto(char *, int); | |
92 | struct sockaddr *get_ifa(char *, int); | |
93 | void usage(void); | |
94 | int check_option(struct client_lease *l, int option); | |
95 | int ipv4addrs(char * buf); | |
96 | int res_hnok(const char *dn); | |
97 | char *option_as_string(unsigned int code, unsigned char *data, int len); | |
98 | int fork_privchld(int, int); | |
f96419f4 | 99 | void get_ifname(char *, char *); |
846204b6 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 | ||
104 | time_t scripttime; | |
105 | static FILE *leaseFile; | |
106 | ||
107 | int | |
108 | findproto(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 | ||
137 | struct sockaddr * | |
138 | get_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 | 155 | struct iaddr defaddr = { .len = 4 }; /* NULL is for silence warnings */ |
846204b6 | 156 | |
846204b6 HT |
157 | void |
158 | routehandler(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; | |
28d4e79d | 171 | char *errmsg, buf[64]; |
846204b6 HT |
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); | |
28d4e79d AHJ |
190 | if (sa == NULL) { |
191 | errmsg = "sa == NULL"; | |
846204b6 | 192 | goto die; |
28d4e79d | 193 | } |
846204b6 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 | ||
03b1a5b4 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) | |
846204b6 HT |
205 | if (addr_eq(a, l->address)) |
206 | break; | |
207 | ||
f155048f | 208 | if (l != NULL) |
846204b6 HT |
209 | /* new addr is the one we set */ |
210 | break; | |
28d4e79d AHJ |
211 | snprintf(buf, sizeof(buf), "%s: %s", |
212 | "new address not one we set", piaddr(a)); | |
213 | errmsg = buf; | |
846204b6 HT |
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; | |
03b1a5b4 | 221 | /* XXX check addrs like RTM_NEWADDR instead of this? */ |
846204b6 HT |
222 | if (scripttime == 0 || t < scripttime + 10) |
223 | break; | |
28d4e79d | 224 | errmsg = "interface address deleted"; |
846204b6 HT |
225 | goto die; |
226 | case RTM_IFINFO: | |
227 | ifm = (struct if_msghdr *)rtm; | |
228 | if (ifm->ifm_index != ifi->index) | |
229 | break; | |
28d4e79d AHJ |
230 | if ((rtm->rtm_flags & RTF_UP) == 0) { |
231 | errmsg = "interface down"; | |
846204b6 | 232 | goto die; |
28d4e79d | 233 | } |
846204b6 HT |
234 | |
235 | linkstat = | |
236 | LINK_STATE_IS_UP(ifm->ifm_data.ifi_link_state) ? 1 : 0; | |
237 | if (linkstat != ifi->linkstat) { | |
84c21dc9 | 238 | #ifdef DEBUG |
846204b6 HT |
239 | debug("link state %s -> %s", |
240 | ifi->linkstat ? "up" : "down", | |
241 | linkstat ? "up" : "down"); | |
84c21dc9 | 242 | #endif |
846204b6 HT |
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 && | |
28d4e79d AHJ |
253 | ifan->ifan_index == ifi->index) { |
254 | errmsg = "interface departure"; | |
846204b6 | 255 | goto die; |
28d4e79d | 256 | } |
846204b6 HT |
257 | break; |
258 | default: | |
259 | break; | |
260 | } | |
261 | return; | |
262 | ||
263 | die: | |
f155048f | 264 | script_init("FAIL"); |
846204b6 | 265 | script_go(); |
28d4e79d | 266 | error("routehandler: %s", errmsg); |
846204b6 HT |
267 | } |
268 | ||
269 | int | |
270 | main(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 | ||
f96419f4 | 316 | get_ifname(ifi->name, argv[0]); |
846204b6 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 | } |
05248929 | 355 | if (i > 0) |
77a69a5f | 356 | fprintf(stderr, " got link\n"); |
846204b6 HT |
357 | |
358 | dispatch: | |
359 | if ((nullfd = open(_PATH_DEVNULL, O_RDWR, 0)) == -1) | |
360 | error("cannot open %s: %m", _PATH_DEVNULL); | |
361 | ||
b48f010c AHJ |
362 | if ((pw = getpwnam("_dhcp")) == NULL) |
363 | error("no such user: _dhcp"); | |
846204b6 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 | ||
846204b6 HT |
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 | ||
415 | void | |
416 | usage(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 | */ | |
452 | void | |
453 | state_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; | |
944f2750 | 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 | */ | |
484 | void | |
485 | state_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; | |
944f2750 | 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 | */ | |
505 | void | |
506 | state_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 { |
f155048f 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 | } | |
f155048f | 539 | picked->next = NULL; |
846204b6 HT |
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; | |
944f2750 | 562 | client->interval = 0; |
846204b6 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 | ||
575 | void | |
576 | dhcpack(struct iaddr client_addr, struct option_data *options) | |
577 | { | |
578 | struct client_lease *lease; | |
579 | ||
846204b6 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 | ||
846204b6 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 | ||
643 | void | |
644 | bind_lease(void) | |
645 | { | |
846204b6 HT |
646 | /* Run the client script with the new parameters. */ |
647 | script_init((client->state == S_REQUESTING ? "BOUND" : | |
648 | (client->state == S_RENEWING ? "RENEW" : | |
f155048f | 649 | (client->state == S_REBOOTING ? "REBOOT" : "REBIND")))); |
846204b6 HT |
650 | if (client->active && client->state != S_REBOOTING) |
651 | script_write_params("old_", client->active); | |
652 | script_write_params("new_", client->new); | |
846204b6 HT |
653 | script_go(); |
654 | ||
655 | /* Replace the old active lease with the new one. */ | |
656 | if (client->active) | |
657 | free_client_lease(client->active); | |
658 | client->active = client->new; | |
659 | client->new = NULL; | |
660 | ||
377552a8 AHJ |
661 | /* Write out new leases file. */ |
662 | rewrite_client_leases(); | |
663 | ||
846204b6 HT |
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 | */ | |
681 | void | |
682 | state_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; | |
944f2750 | 697 | client->interval = 0; |
846204b6 HT |
698 | client->state = S_RENEWING; |
699 | ||
700 | /* Send the first packet immediately. */ | |
701 | send_request(); | |
702 | } | |
703 | ||
704 | void | |
705 | dhcpoffer(struct iaddr client_addr, struct option_data *options) | |
706 | { | |
707 | struct client_lease *lease, *lp; | |
708 | int i; | |
f155048f | 709 | int stop_selecting; |
846204b6 HT |
710 | char *name = options[DHO_DHCP_MESSAGE_TYPE].len ? "DHCPOFFER" : |
711 | "BOOTREPLY"; | |
712 | ||
846204b6 HT |
713 | |
714 | if (client->state != S_SELECTING) | |
715 | return; | |
716 | ||
846204b6 HT |
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)) { | |
84c21dc9 | 733 | #ifdef DEBUG |
846204b6 | 734 | debug("%s already seen.", name); |
84c21dc9 | 735 | #endif |
846204b6 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 | ||
846204b6 HT |
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. */ | |
12d96337 | 756 | if (addr_eq(lease->address, client->requested_address)) { |
846204b6 HT |
757 | lease->next = client->offered_leases; |
758 | client->offered_leases = lease; | |
759 | } else { | |
846204b6 HT |
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 | ||
846204b6 HT |
772 | /* If the selecting interval has expired, go immediately to |
773 | state_selecting(). Otherwise, time out into | |
774 | state_selecting at the select interval. */ | |
944f2750 | 775 | if (stop_selecting <= cur_time) |
846204b6 HT |
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 | */ | |
787 | struct client_lease * | |
788 | packet_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 | ||
857 | void | |
858 | dhcpnak(struct iaddr client_addr, struct option_data *options) | |
859 | { | |
846204b6 HT |
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 HT |
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 | */ | |
888 | void | |
889 | send_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 HT |
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 | */ | |
956 | void | |
957 | state_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. */ | |
f155048f | 976 | script_init("TIMEOUT"); |
846204b6 | 977 | script_write_params("new_", client->active); |
846204b6 HT |
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 | ||
1009 | activate_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."); | |
f155048f | 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 | ||
1040 | void | |
1041 | send_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 | ||
846204b6 HT |
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. */ | |
f155048f | 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 | ||
1139 | void | |
1140 | send_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 | ||
1150 | void | |
1151 | make_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. */ | |
3c8fe83f | 1188 | i = cons_options(options); |
846204b6 HT |
1189 | if (i == -1 || client->packet.options[i] != DHO_END) |
1190 | error("options do not fit in DHCPDISCOVER packet."); | |
1191 | client->packet_length = DHCP_FIXED_NON_UDP+i+1; | |
1192 | if (client->packet_length < BOOTP_MIN_LEN) | |
1193 | client->packet_length = BOOTP_MIN_LEN; | |
1194 | ||
1195 | client->packet.op = BOOTREQUEST; | |
1196 | client->packet.htype = ifi->hw_address.htype; | |
1197 | client->packet.hlen = ifi->hw_address.hlen; | |
1198 | client->packet.hops = 0; | |
1199 | client->packet.xid = arc4random(); | |
1200 | client->packet.secs = 0; /* filled in by send_discover. */ | |
1201 | client->packet.flags = 0; | |
1202 | ||
1203 | memset(&client->packet.ciaddr, 0, sizeof(client->packet.ciaddr)); | |
1204 | memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr)); | |
1205 | memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr)); | |
1206 | memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr)); | |
1207 | memcpy(client->packet.chaddr, ifi->hw_address.haddr, | |
1208 | ifi->hw_address.hlen); | |
1209 | } | |
1210 | ||
1211 | void | |
1212 | make_request(struct client_lease * lease) | |
1213 | { | |
1214 | unsigned char request = DHCPREQUEST; | |
1215 | struct option_data options[256]; | |
1216 | int i; | |
1217 | ||
1218 | memset(options, 0, sizeof(options)); | |
1219 | memset(&client->packet, 0, sizeof(client->packet)); | |
1220 | ||
1221 | /* Set DHCP_MESSAGE_TYPE to DHCPREQUEST */ | |
1222 | i = DHO_DHCP_MESSAGE_TYPE; | |
1223 | options[i].data = &request; | |
1224 | options[i].len = sizeof(request); | |
1225 | ||
1226 | /* Request the options we want */ | |
1227 | i = DHO_DHCP_PARAMETER_REQUEST_LIST; | |
1228 | options[i].data = config->requested_options; | |
1229 | options[i].len = config->requested_option_count; | |
1230 | ||
1231 | /* If we are requesting an address that hasn't yet been assigned | |
1232 | to us, use the DHCP Requested Address option. */ | |
1233 | if (client->state == S_REQUESTING) { | |
1234 | /* Send back the server identifier... */ | |
1235 | i = DHO_DHCP_SERVER_IDENTIFIER; | |
1236 | options[i].data = lease->options[i].data; | |
1237 | options[i].len = lease->options[i].len; | |
1238 | } | |
1239 | if (client->state == S_REQUESTING || | |
1240 | client->state == S_REBOOTING) { | |
1241 | client->requested_address = lease->address; | |
1242 | i = DHO_DHCP_REQUESTED_ADDRESS; | |
1243 | options[i].data = lease->address.iabuf; | |
1244 | options[i].len = lease->address.len; | |
1245 | } else | |
1246 | client->requested_address.len = 0; | |
1247 | ||
1248 | /* Send any options requested in the config file. */ | |
1249 | for (i = 0; i < 256; i++) | |
1250 | if (!options[i].data && config->send_options[i].data) { | |
1251 | options[i].data = config->send_options[i].data; | |
1252 | options[i].len = config->send_options[i].len; | |
1253 | } | |
1254 | ||
1255 | /* Set up the option buffer to fit in a minimal UDP packet. */ | |
3c8fe83f | 1256 | i = cons_options(options); |
846204b6 HT |
1257 | if (i == -1 || client->packet.options[i] != DHO_END) |
1258 | error("options do not fit in DHCPREQUEST packet."); | |
1259 | client->packet_length = DHCP_FIXED_NON_UDP+i+1; | |
1260 | if (client->packet_length < BOOTP_MIN_LEN) | |
1261 | client->packet_length = BOOTP_MIN_LEN; | |
1262 | ||
1263 | client->packet.op = BOOTREQUEST; | |
1264 | client->packet.htype = ifi->hw_address.htype; | |
1265 | client->packet.hlen = ifi->hw_address.hlen; | |
1266 | client->packet.hops = 0; | |
1267 | client->packet.xid = client->xid; | |
1268 | client->packet.secs = 0; /* Filled in by send_request. */ | |
1269 | client->packet.flags = 0; | |
1270 | ||
1271 | /* If we own the address we're requesting, put it in ciaddr; | |
1272 | otherwise set ciaddr to zero. */ | |
1273 | if (client->state == S_BOUND || | |
1274 | client->state == S_RENEWING || | |
1275 | client->state == S_REBINDING) { | |
1276 | memcpy(&client->packet.ciaddr, | |
1277 | lease->address.iabuf, lease->address.len); | |
1278 | } else { | |
1279 | memset(&client->packet.ciaddr, 0, | |
1280 | sizeof(client->packet.ciaddr)); | |
1281 | } | |
1282 | ||
1283 | memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr)); | |
1284 | memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr)); | |
1285 | memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr)); | |
1286 | memcpy(client->packet.chaddr, ifi->hw_address.haddr, | |
1287 | ifi->hw_address.hlen); | |
1288 | } | |
1289 | ||
1290 | void | |
1291 | make_decline(struct client_lease *lease) | |
1292 | { | |
1293 | struct option_data options[256]; | |
1294 | unsigned char decline = DHCPDECLINE; | |
1295 | int i; | |
1296 | ||
1297 | memset(options, 0, sizeof(options)); | |
1298 | memset(&client->packet, 0, sizeof(client->packet)); | |
1299 | ||
1300 | /* Set DHCP_MESSAGE_TYPE to DHCPDECLINE */ | |
1301 | i = DHO_DHCP_MESSAGE_TYPE; | |
1302 | options[i].data = &decline; | |
1303 | options[i].len = sizeof(decline); | |
1304 | ||
1305 | /* Send back the server identifier... */ | |
1306 | i = DHO_DHCP_SERVER_IDENTIFIER; | |
1307 | options[i].data = lease->options[i].data; | |
1308 | options[i].len = lease->options[i].len; | |
1309 | ||
1310 | /* Send back the address we're declining. */ | |
1311 | i = DHO_DHCP_REQUESTED_ADDRESS; | |
1312 | options[i].data = lease->address.iabuf; | |
1313 | options[i].len = lease->address.len; | |
1314 | ||
1315 | /* Send the uid if the user supplied one. */ | |
1316 | i = DHO_DHCP_CLIENT_IDENTIFIER; | |
1317 | if (config->send_options[i].len) { | |
1318 | options[i].data = config->send_options[i].data; | |
1319 | options[i].len = config->send_options[i].len; | |
1320 | } | |
1321 | ||
1322 | /* Set up the option buffer to fit in a minimal UDP packet. */ | |
3c8fe83f | 1323 | i = cons_options(options); |
846204b6 HT |
1324 | if (i == -1 || client->packet.options[i] != DHO_END) |
1325 | error("options do not fit in DHCPDECLINE packet."); | |
1326 | client->packet_length = DHCP_FIXED_NON_UDP+i+1; | |
1327 | if (client->packet_length < BOOTP_MIN_LEN) | |
1328 | client->packet_length = BOOTP_MIN_LEN; | |
1329 | ||
1330 | client->packet.op = BOOTREQUEST; | |
1331 | client->packet.htype = ifi->hw_address.htype; | |
1332 | client->packet.hlen = ifi->hw_address.hlen; | |
1333 | client->packet.hops = 0; | |
1334 | client->packet.xid = client->xid; | |
1335 | client->packet.secs = 0; /* Filled in by send_request. */ | |
1336 | client->packet.flags = 0; | |
1337 | ||
1338 | /* ciaddr must always be zero. */ | |
1339 | memset(&client->packet.ciaddr, 0, sizeof(client->packet.ciaddr)); | |
1340 | memset(&client->packet.yiaddr, 0, sizeof(client->packet.yiaddr)); | |
1341 | memset(&client->packet.siaddr, 0, sizeof(client->packet.siaddr)); | |
1342 | memset(&client->packet.giaddr, 0, sizeof(client->packet.giaddr)); | |
1343 | memcpy(client->packet.chaddr, ifi->hw_address.haddr, | |
1344 | ifi->hw_address.hlen); | |
1345 | } | |
1346 | ||
1347 | void | |
1348 | free_client_lease(struct client_lease *lease) | |
1349 | { | |
1350 | int i; | |
1351 | ||
1352 | if (lease->server_name) | |
1353 | free(lease->server_name); | |
1354 | if (lease->filename) | |
1355 | free(lease->filename); | |
1356 | for (i = 0; i < 256; i++) { | |
1357 | if (lease->options[i].len) | |
1358 | free(lease->options[i].data); | |
1359 | } | |
1360 | free(lease); | |
1361 | } | |
1362 | ||
1363 | void | |
1364 | rewrite_client_leases(void) | |
1365 | { | |
1366 | struct client_lease *lp; | |
1367 | ||
1368 | if (!leaseFile) /* XXX */ | |
1369 | error("lease file not open"); | |
1370 | ||
1371 | fflush(leaseFile); | |
1372 | rewind(leaseFile); | |
1373 | ||
377552a8 AHJ |
1374 | for (lp = client->leases; lp; lp = lp->next) { |
1375 | if (client->active && addr_eq(lp->address, | |
1376 | client->active->address)) | |
1377 | continue; | |
1378 | write_client_lease(lp); | |
1379 | } | |
1380 | ||
846204b6 | 1381 | if (client->active) |
377552a8 | 1382 | write_client_lease(client->active); |
846204b6 HT |
1383 | |
1384 | fflush(leaseFile); | |
1385 | ftruncate(fileno(leaseFile), ftello(leaseFile)); | |
1386 | fsync(fileno(leaseFile)); | |
1387 | } | |
1388 | ||
1389 | void | |
377552a8 | 1390 | write_client_lease(struct client_lease *lease) |
846204b6 | 1391 | { |
846204b6 HT |
1392 | struct tm *t; |
1393 | int i; | |
1394 | ||
846204b6 HT |
1395 | /* If the lease came from the config file, we don't need to stash |
1396 | a copy in the lease database. */ | |
1397 | if (lease->is_static) | |
1398 | return; | |
1399 | ||
1400 | if (!leaseFile) /* XXX */ | |
1401 | error("lease file not open"); | |
1402 | ||
1403 | fprintf(leaseFile, "lease {\n"); | |
1404 | if (lease->is_bootp) | |
1405 | fprintf(leaseFile, " bootp;\n"); | |
1406 | fprintf(leaseFile, " interface \"%s\";\n", ifi->name); | |
1407 | fprintf(leaseFile, " fixed-address %s;\n", piaddr(lease->address)); | |
1408 | if (lease->filename) | |
1409 | fprintf(leaseFile, " filename \"%s\";\n", lease->filename); | |
1410 | if (lease->server_name) | |
1411 | fprintf(leaseFile, " server-name \"%s\";\n", | |
1412 | lease->server_name); | |
846204b6 HT |
1413 | for (i = 0; i < 256; i++) |
1414 | if (lease->options[i].len) | |
1415 | fprintf(leaseFile, " option %s %s;\n", | |
1416 | dhcp_options[i].name, | |
1417 | pretty_print_option(i, lease->options[i].data, | |
1418 | lease->options[i].len, 1, 1)); | |
1419 | ||
1420 | t = gmtime(&lease->renewal); | |
1421 | fprintf(leaseFile, " renew %d %d/%d/%d %02d:%02d:%02d;\n", | |
1422 | t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, | |
1423 | t->tm_hour, t->tm_min, t->tm_sec); | |
1424 | t = gmtime(&lease->rebind); | |
1425 | fprintf(leaseFile, " rebind %d %d/%d/%d %02d:%02d:%02d;\n", | |
1426 | t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, | |
1427 | t->tm_hour, t->tm_min, t->tm_sec); | |
1428 | t = gmtime(&lease->expiry); | |
1429 | fprintf(leaseFile, " expire %d %d/%d/%d %02d:%02d:%02d;\n", | |
1430 | t->tm_wday, t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, | |
1431 | t->tm_hour, t->tm_min, t->tm_sec); | |
1432 | fprintf(leaseFile, "}\n"); | |
1433 | fflush(leaseFile); | |
1434 | } | |
1435 | ||
1436 | void | |
f155048f | 1437 | script_init(char *reason) |
846204b6 | 1438 | { |
f155048f | 1439 | size_t len; |
846204b6 HT |
1440 | struct imsg_hdr hdr; |
1441 | struct buf *buf; | |
1442 | ||
846204b6 | 1443 | hdr.code = IMSG_SCRIPT_INIT; |
f155048f | 1444 | hdr.len = sizeof(struct imsg_hdr) + sizeof(size_t) + strlen(reason); |
846204b6 HT |
1445 | buf = buf_open(hdr.len); |
1446 | ||
1447 | buf_add(buf, &hdr, sizeof(hdr)); | |
846204b6 HT |
1448 | len = strlen(reason); |
1449 | buf_add(buf, &len, sizeof(len)); | |
1450 | buf_add(buf, reason, len); | |
1451 | ||
1452 | buf_close(privfd, buf); | |
1453 | } | |
1454 | ||
1455 | void | |
f155048f | 1456 | priv_script_init(char *reason) |
846204b6 HT |
1457 | { |
1458 | client->scriptEnvsize = 100; | |
1459 | if (client->scriptEnv == NULL) | |
1460 | client->scriptEnv = | |
1461 | calloc(client->scriptEnvsize, sizeof(char *)); | |
1462 | if (client->scriptEnv == NULL) | |
1463 | error("script_init: no memory for environment"); | |
1464 | ||
1465 | client->scriptEnv[0] = strdup(CLIENT_PATH); | |
1466 | if (client->scriptEnv[0] == NULL) | |
1467 | error("script_init: no memory for environment"); | |
1468 | ||
1469 | client->scriptEnv[1] = NULL; | |
1470 | ||
1471 | script_set_env("", "interface", ifi->name); | |
1472 | ||
846204b6 HT |
1473 | script_set_env("", "reason", reason); |
1474 | } | |
1475 | ||
1476 | void | |
1477 | priv_script_write_params(char *prefix, struct client_lease *lease) | |
1478 | { | |
1479 | u_int8_t dbuf[1500]; | |
1480 | int i, len = 0; | |
1481 | char tbuf[128]; | |
1482 | ||
1483 | script_set_env(prefix, "ip_address", piaddr(lease->address)); | |
1484 | ||
1485 | if (lease->options[DHO_SUBNET_MASK].len && | |
1486 | (lease->options[DHO_SUBNET_MASK].len < | |
1487 | sizeof(lease->address.iabuf))) { | |
1488 | struct iaddr netmask, subnet, broadcast; | |
1489 | ||
1490 | memcpy(netmask.iabuf, lease->options[DHO_SUBNET_MASK].data, | |
1491 | lease->options[DHO_SUBNET_MASK].len); | |
1492 | netmask.len = lease->options[DHO_SUBNET_MASK].len; | |
1493 | ||
1494 | subnet = subnet_number(lease->address, netmask); | |
1495 | if (subnet.len) { | |
1496 | script_set_env(prefix, "network_number", | |
1497 | piaddr(subnet)); | |
1498 | if (!lease->options[DHO_BROADCAST_ADDRESS].len) { | |
1499 | broadcast = broadcast_addr(subnet, netmask); | |
1500 | if (broadcast.len) | |
1501 | script_set_env(prefix, | |
1502 | "broadcast_address", | |
1503 | piaddr(broadcast)); | |
1504 | } | |
1505 | } | |
1506 | } | |
1507 | ||
1508 | if (lease->filename) | |
1509 | script_set_env(prefix, "filename", lease->filename); | |
1510 | if (lease->server_name) | |
1511 | script_set_env(prefix, "server_name", | |
1512 | lease->server_name); | |
1513 | for (i = 0; i < 256; i++) { | |
1514 | u_int8_t *dp = NULL; | |
1515 | ||
1516 | if (config->defaults[i].len) { | |
1517 | if (lease->options[i].len) { | |
1518 | switch (config->default_actions[i]) { | |
1519 | case ACTION_DEFAULT: | |
1520 | dp = lease->options[i].data; | |
1521 | len = lease->options[i].len; | |
1522 | break; | |
1523 | case ACTION_SUPERSEDE: | |
1524 | supersede: | |
1525 | dp = config->defaults[i].data; | |
1526 | len = config->defaults[i].len; | |
1527 | break; | |
1528 | case ACTION_PREPEND: | |
1529 | len = config->defaults[i].len + | |
1530 | lease->options[i].len; | |
df7e6fe8 | 1531 | if (len >= sizeof(dbuf)) { |
846204b6 HT |
1532 | warning("no space to %s %s", |
1533 | "prepend option", | |
1534 | dhcp_options[i].name); | |
1535 | goto supersede; | |
1536 | } | |
1537 | dp = dbuf; | |
1538 | memcpy(dp, | |
1539 | config->defaults[i].data, | |
1540 | config->defaults[i].len); | |
1541 | memcpy(dp + | |
1542 | config->defaults[i].len, | |
1543 | lease->options[i].data, | |
1544 | lease->options[i].len); | |
1545 | dp[len] = '\0'; | |
1546 | break; | |
1547 | case ACTION_APPEND: | |
1548 | len = config->defaults[i].len + | |
1549 | lease->options[i].len; | |
df7e6fe8 | 1550 | if (len >= sizeof(dbuf)) { |
846204b6 HT |
1551 | warning("no space to %s %s", |
1552 | "append option", | |
1553 | dhcp_options[i].name); | |
1554 | goto supersede; | |
1555 | } | |
1556 | dp = dbuf; | |
1557 | memcpy(dp, lease->options[i].data, | |
1558 | lease->options[i].len); | |
1559 | memcpy(dp + lease->options[i].len, | |
1560 | config->defaults[i].data, | |
1561 | config->defaults[i].len); | |
1562 | dp[len] = '\0'; | |
1563 | } | |
1564 | } else { | |
1565 | dp = config->defaults[i].data; | |
1566 | len = config->defaults[i].len; | |
1567 | } | |
1568 | } else if (lease->options[i].len) { | |
1569 | len = lease->options[i].len; | |
1570 | dp = lease->options[i].data; | |
1571 | } else { | |
1572 | len = 0; | |
1573 | } | |
1574 | if (len) { | |
1575 | char name[256]; | |
1576 | ||
1577 | if (dhcp_option_ev_name(name, sizeof(name), | |
1578 | &dhcp_options[i])) | |
1579 | script_set_env(prefix, name, | |
1580 | pretty_print_option(i, dp, len, 0, 0)); | |
1581 | } | |
1582 | } | |
1583 | snprintf(tbuf, sizeof(tbuf), "%d", (int)lease->expiry); | |
1584 | script_set_env(prefix, "expiry", tbuf); | |
1585 | } | |
1586 | ||
1587 | void | |
1588 | script_write_params(char *prefix, struct client_lease *lease) | |
1589 | { | |
1590 | size_t fn_len = 0, sn_len = 0, pr_len = 0; | |
1591 | struct imsg_hdr hdr; | |
1592 | struct buf *buf; | |
1593 | int i; | |
1594 | ||
1595 | if (lease->filename != NULL) | |
1596 | fn_len = strlen(lease->filename); | |
1597 | if (lease->server_name != NULL) | |
1598 | sn_len = strlen(lease->server_name); | |
1599 | if (prefix != NULL) | |
1600 | pr_len = strlen(prefix); | |
1601 | ||
1602 | hdr.code = IMSG_SCRIPT_WRITE_PARAMS; | |
1603 | hdr.len = sizeof(hdr) + sizeof(struct client_lease) + | |
1604 | sizeof(size_t) + fn_len + sizeof(size_t) + sn_len + | |
1605 | sizeof(size_t) + pr_len; | |
1606 | ||
1607 | for (i = 0; i < 256; i++) | |
1608 | hdr.len += sizeof(int) + lease->options[i].len; | |
1609 | ||
1610 | scripttime = time(NULL); | |
1611 | ||
1612 | buf = buf_open(hdr.len); | |
1613 | ||
1614 | buf_add(buf, &hdr, sizeof(hdr)); | |
1615 | buf_add(buf, lease, sizeof(struct client_lease)); | |
1616 | buf_add(buf, &fn_len, sizeof(fn_len)); | |
1617 | buf_add(buf, lease->filename, fn_len); | |
1618 | buf_add(buf, &sn_len, sizeof(sn_len)); | |
1619 | buf_add(buf, lease->server_name, sn_len); | |
1620 | buf_add(buf, &pr_len, sizeof(pr_len)); | |
1621 | buf_add(buf, prefix, pr_len); | |
1622 | ||
1623 | for (i = 0; i < 256; i++) { | |
1624 | buf_add(buf, &lease->options[i].len, | |
1625 | sizeof(lease->options[i].len)); | |
1626 | buf_add(buf, lease->options[i].data, | |
1627 | lease->options[i].len); | |
1628 | } | |
1629 | ||
1630 | buf_close(privfd, buf); | |
1631 | } | |
1632 | ||
1633 | int | |
1634 | script_go(void) | |
1635 | { | |
1636 | struct imsg_hdr hdr; | |
1637 | struct buf *buf; | |
1638 | int ret; | |
1639 | ||
1640 | scripttime = time(NULL); | |
1641 | ||
1642 | hdr.code = IMSG_SCRIPT_GO; | |
1643 | hdr.len = sizeof(struct imsg_hdr); | |
1644 | ||
1645 | buf = buf_open(hdr.len); | |
1646 | ||
1647 | buf_add(buf, &hdr, sizeof(hdr)); | |
1648 | buf_close(privfd, buf); | |
1649 | ||
1650 | bzero(&hdr, sizeof(hdr)); | |
1651 | buf_read(privfd, &hdr, sizeof(hdr)); | |
1652 | if (hdr.code != IMSG_SCRIPT_GO_RET) | |
1653 | error("unexpected msg type %u", hdr.code); | |
1654 | if (hdr.len != sizeof(hdr) + sizeof(int)) | |
1655 | error("received corrupted message"); | |
1656 | buf_read(privfd, &ret, sizeof(ret)); | |
1657 | ||
1658 | return (ret); | |
1659 | } | |
1660 | ||
1661 | int | |
1662 | priv_script_go(void) | |
1663 | { | |
1664 | char *scriptName, *argv[2], **envp; | |
1665 | int pid, wpid, wstatus; | |
1666 | ||
1667 | scripttime = time(NULL); | |
1668 | ||
1669 | scriptName = config->script_name; | |
1670 | envp = client->scriptEnv; | |
1671 | ||
1672 | argv[0] = scriptName; | |
1673 | argv[1] = NULL; | |
1674 | ||
1675 | pid = fork(); | |
1676 | if (pid < 0) { | |
1677 | error("fork: %m"); | |
1678 | wstatus = 0; | |
1679 | } else if (pid) { | |
1680 | do { | |
1681 | wpid = wait(&wstatus); | |
1682 | } while (wpid != pid && wpid > 0); | |
1683 | if (wpid < 0) { | |
1684 | error("wait: %m"); | |
1685 | wstatus = 0; | |
1686 | } | |
1687 | } else { | |
1688 | execve(scriptName, argv, envp); | |
1689 | error("execve (%s, ...): %m", scriptName); | |
1690 | } | |
1691 | ||
1692 | script_flush_env(); | |
1693 | ||
1694 | return (WEXITSTATUS(wstatus)); | |
1695 | } | |
1696 | ||
1697 | void | |
1698 | script_set_env(const char *prefix, const char *name, const char *value) | |
1699 | { | |
1700 | int i, j, namelen; | |
1701 | ||
1702 | namelen = strlen(name); | |
1703 | ||
1704 | for (i = 0; client->scriptEnv[i]; i++) | |
1705 | if (strncmp(client->scriptEnv[i], name, namelen) == 0 && | |
1706 | client->scriptEnv[i][namelen] == '=') | |
1707 | break; | |
1708 | ||
1709 | if (client->scriptEnv[i]) | |
1710 | /* Reuse the slot. */ | |
1711 | free(client->scriptEnv[i]); | |
1712 | else { | |
1713 | /* New variable. Expand if necessary. */ | |
1714 | if (i >= client->scriptEnvsize - 1) { | |
1715 | char **newscriptEnv; | |
1716 | int newscriptEnvsize = client->scriptEnvsize + 50; | |
1717 | ||
1718 | newscriptEnv = realloc(client->scriptEnv, | |
1719 | newscriptEnvsize); | |
1720 | if (newscriptEnv == NULL) { | |
1721 | free(client->scriptEnv); | |
1722 | client->scriptEnv = NULL; | |
1723 | client->scriptEnvsize = 0; | |
1724 | error("script_set_env: no memory for variable"); | |
1725 | } | |
1726 | client->scriptEnv = newscriptEnv; | |
1727 | client->scriptEnvsize = newscriptEnvsize; | |
1728 | } | |
1729 | /* need to set the NULL pointer at end of array beyond | |
1730 | the new slot. */ | |
1731 | client->scriptEnv[i + 1] = NULL; | |
1732 | } | |
1733 | /* Allocate space and format the variable in the appropriate slot. */ | |
1734 | client->scriptEnv[i] = malloc(strlen(prefix) + strlen(name) + 1 + | |
1735 | strlen(value) + 1); | |
1736 | if (client->scriptEnv[i] == NULL) | |
1737 | error("script_set_env: no memory for variable assignment"); | |
1738 | ||
1739 | /* No `` or $() command substitution allowed in environment values! */ | |
1740 | for (j = 0; j < strlen(value); j++) | |
1741 | switch (value[j]) { | |
1742 | case '`': | |
1743 | case '$': | |
1744 | error("illegal character (%c) in value '%s'", value[j], | |
1745 | value); | |
1746 | /* not reached */ | |
1747 | } | |
1748 | snprintf(client->scriptEnv[i], strlen(prefix) + strlen(name) + | |
1749 | 1 + strlen(value) + 1, "%s%s=%s", prefix, name, value); | |
1750 | } | |
1751 | ||
1752 | void | |
1753 | script_flush_env(void) | |
1754 | { | |
1755 | int i; | |
1756 | ||
1757 | for (i = 0; client->scriptEnv[i]; i++) { | |
1758 | free(client->scriptEnv[i]); | |
1759 | client->scriptEnv[i] = NULL; | |
1760 | } | |
1761 | client->scriptEnvsize = 0; | |
1762 | } | |
1763 | ||
1764 | int | |
1765 | dhcp_option_ev_name(char *buf, size_t buflen, const struct option *option) | |
1766 | { | |
1767 | size_t i; | |
1768 | ||
1769 | for (i = 0; option->name[i]; i++) { | |
1770 | if (i + 1 == buflen) | |
1771 | return 0; | |
1772 | if (option->name[i] == '-') | |
1773 | buf[i] = '_'; | |
1774 | else | |
1775 | buf[i] = option->name[i]; | |
1776 | } | |
1777 | ||
1778 | buf[i] = 0; | |
1779 | return 1; | |
1780 | } | |
1781 | ||
1782 | void | |
1783 | go_daemon(void) | |
1784 | { | |
1785 | static int state = 0; | |
1786 | ||
1787 | if (no_daemon || state) | |
1788 | return; | |
1789 | ||
1790 | state = 1; | |
1791 | ||
1792 | /* Stop logging to stderr... */ | |
1793 | log_perror = 0; | |
1794 | ||
1795 | if (daemon(1, 0) == -1) | |
1796 | error("daemon"); | |
1797 | ||
1798 | /* we are chrooted, daemon(3) fails to open /dev/null */ | |
1799 | if (nullfd != -1) { | |
1800 | dup2(nullfd, STDIN_FILENO); | |
1801 | dup2(nullfd, STDOUT_FILENO); | |
1802 | dup2(nullfd, STDERR_FILENO); | |
1803 | close(nullfd); | |
1804 | nullfd = -1; | |
1805 | } | |
1806 | } | |
1807 | ||
1808 | int | |
1809 | check_option(struct client_lease *l, int option) | |
1810 | { | |
1811 | char *opbuf; | |
1812 | char *sbuf; | |
1813 | ||
1814 | /* we use this, since this is what gets passed to dhclient-script */ | |
1815 | ||
1816 | opbuf = pretty_print_option(option, l->options[option].data, | |
1817 | l->options[option].len, 0, 0); | |
1818 | ||
1819 | sbuf = option_as_string(option, l->options[option].data, | |
1820 | l->options[option].len); | |
1821 | ||
1822 | switch (option) { | |
1823 | case DHO_SUBNET_MASK: | |
b3a4979d AHJ |
1824 | case DHO_SWAP_SERVER: |
1825 | case DHO_BROADCAST_ADDRESS: | |
1826 | case DHO_DHCP_SERVER_IDENTIFIER: | |
1827 | case DHO_ROUTER_SOLICITATION_ADDRESS: | |
1828 | case DHO_DHCP_REQUESTED_ADDRESS: | |
1829 | if (ipv4addrs(opbuf) == 0) { | |
1830 | warning("Invalid IP address in option %s: %s", | |
1831 | dhcp_options[option].name, opbuf); | |
1832 | return (0); | |
1833 | } | |
1834 | if (l->options[option].len != 4) { /* RFC 2132 */ | |
1835 | warning("warning: Only 1 IP address allowed in " | |
1836 | "%s option; length %d, must be 4", | |
1837 | dhcp_options[option].name, | |
1838 | l->options[option].len); | |
1839 | l->options[option].len = 4; | |
1840 | } | |
1841 | return (1); | |
846204b6 HT |
1842 | case DHO_TIME_SERVERS: |
1843 | case DHO_NAME_SERVERS: | |
1844 | case DHO_ROUTERS: | |
1845 | case DHO_DOMAIN_NAME_SERVERS: | |
1846 | case DHO_LOG_SERVERS: | |
1847 | case DHO_COOKIE_SERVERS: | |
1848 | case DHO_LPR_SERVERS: | |
1849 | case DHO_IMPRESS_SERVERS: | |
1850 | case DHO_RESOURCE_LOCATION_SERVERS: | |
846204b6 HT |
1851 | case DHO_NIS_SERVERS: |
1852 | case DHO_NTP_SERVERS: | |
1853 | case DHO_NETBIOS_NAME_SERVERS: | |
1854 | case DHO_NETBIOS_DD_SERVER: | |
1855 | case DHO_FONT_SERVERS: | |
b3a4979d AHJ |
1856 | if (ipv4addrs(opbuf) == 0) { |
1857 | warning("Invalid IP address in option %s: %s", | |
1858 | dhcp_options[option].name, opbuf); | |
846204b6 HT |
1859 | return (0); |
1860 | } | |
1861 | return (1); | |
1862 | case DHO_HOST_NAME: | |
1863 | case DHO_DOMAIN_NAME: | |
1864 | case DHO_NIS_DOMAIN: | |
1865 | if (!res_hnok(sbuf)) { | |
1866 | warning("Bogus Host Name option %d: %s (%s)", option, | |
1867 | sbuf, opbuf); | |
1868 | l->options[option].len = 0; | |
1869 | free(l->options[option].data); | |
1870 | } | |
1871 | return (1); | |
1872 | case DHO_PAD: | |
1873 | case DHO_TIME_OFFSET: | |
1874 | case DHO_BOOT_SIZE: | |
1875 | case DHO_MERIT_DUMP: | |
1876 | case DHO_ROOT_PATH: | |
1877 | case DHO_EXTENSIONS_PATH: | |
1878 | case DHO_IP_FORWARDING: | |
1879 | case DHO_NON_LOCAL_SOURCE_ROUTING: | |
1880 | case DHO_POLICY_FILTER: | |
1881 | case DHO_MAX_DGRAM_REASSEMBLY: | |
1882 | case DHO_DEFAULT_IP_TTL: | |
1883 | case DHO_PATH_MTU_AGING_TIMEOUT: | |
1884 | case DHO_PATH_MTU_PLATEAU_TABLE: | |
1885 | case DHO_INTERFACE_MTU: | |
1886 | case DHO_ALL_SUBNETS_LOCAL: | |
1887 | case DHO_PERFORM_MASK_DISCOVERY: | |
1888 | case DHO_MASK_SUPPLIER: | |
1889 | case DHO_ROUTER_DISCOVERY: | |
846204b6 HT |
1890 | case DHO_STATIC_ROUTES: |
1891 | case DHO_TRAILER_ENCAPSULATION: | |
1892 | case DHO_ARP_CACHE_TIMEOUT: | |
1893 | case DHO_IEEE802_3_ENCAPSULATION: | |
1894 | case DHO_DEFAULT_TCP_TTL: | |
1895 | case DHO_TCP_KEEPALIVE_INTERVAL: | |
1896 | case DHO_TCP_KEEPALIVE_GARBAGE: | |
1897 | case DHO_VENDOR_ENCAPSULATED_OPTIONS: | |
1898 | case DHO_NETBIOS_NODE_TYPE: | |
1899 | case DHO_NETBIOS_SCOPE: | |
1900 | case DHO_X_DISPLAY_MANAGER: | |
846204b6 HT |
1901 | case DHO_DHCP_LEASE_TIME: |
1902 | case DHO_DHCP_OPTION_OVERLOAD: | |
1903 | case DHO_DHCP_MESSAGE_TYPE: | |
1904 | case DHO_DHCP_PARAMETER_REQUEST_LIST: | |
1905 | case DHO_DHCP_MESSAGE: | |
1906 | case DHO_DHCP_MAX_MESSAGE_SIZE: | |
1907 | case DHO_DHCP_RENEWAL_TIME: | |
1908 | case DHO_DHCP_REBINDING_TIME: | |
1909 | case DHO_DHCP_CLASS_IDENTIFIER: | |
1910 | case DHO_DHCP_CLIENT_IDENTIFIER: | |
1911 | case DHO_DHCP_USER_CLASS_ID: | |
f64350ef | 1912 | case DHO_TFTP_SERVER: |
846204b6 HT |
1913 | case DHO_END: |
1914 | return (1); | |
1915 | default: | |
d6210ec6 AHJ |
1916 | if (!unknown_ok) |
1917 | warning("unknown dhcp option value 0x%x", option); | |
846204b6 HT |
1918 | return (unknown_ok); |
1919 | } | |
1920 | } | |
1921 | ||
1922 | int | |
1923 | res_hnok(const char *name) | |
1924 | { | |
1925 | const char *dn = name; | |
1926 | int pch = '.', ch = *dn++; | |
1927 | int warn = 0; | |
1928 | ||
1929 | while (ch != '\0') { | |
1930 | int nch = *dn++; | |
1931 | ||
1932 | if (ch == '.') { | |
1933 | ; | |
1934 | } else if (pch == '.' || nch == '.' || nch == '\0') { | |
1935 | if (!isalnum(ch)) | |
1936 | return (0); | |
1937 | } else if (!isalnum(ch) && ch != '-' && ch != '_') | |
1938 | return (0); | |
1939 | else if (ch == '_' && warn == 0) { | |
1940 | warning("warning: hostname %s contains an " | |
1941 | "underscore which violates RFC 952", name); | |
1942 | warn++; | |
1943 | } | |
1944 | pch = ch, ch = nch; | |
1945 | } | |
1946 | return (1); | |
1947 | } | |
1948 | ||
1949 | /* Does buf consist only of dotted decimal ipv4 addrs? | |
1950 | * return how many if so, | |
1951 | * otherwise, return 0 | |
1952 | */ | |
1953 | int | |
1954 | ipv4addrs(char * buf) | |
1955 | { | |
1956 | struct in_addr jnk; | |
1957 | int count = 0; | |
1958 | ||
1959 | while (inet_aton(buf, &jnk) == 1){ | |
1960 | count++; | |
1961 | while (*buf == '.' || isdigit(*buf)) | |
1962 | buf++; | |
1963 | if (*buf == '\0') | |
1964 | return (count); | |
1965 | while (*buf == ' ') | |
1966 | buf++; | |
1967 | } | |
1968 | return (0); | |
1969 | } | |
1970 | ||
1971 | char * | |
1972 | option_as_string(unsigned int code, unsigned char *data, int len) | |
1973 | { | |
1974 | static char optbuf[32768]; /* XXX */ | |
1975 | char *op = optbuf; | |
1976 | int opleft = sizeof(optbuf); | |
1977 | unsigned char *dp = data; | |
1978 | ||
1979 | if (code > 255) | |
1980 | error("option_as_string: bad code %d", code); | |
1981 | ||
1982 | for (; dp < data + len; dp++) { | |
1983 | if (!isascii(*dp) || !isprint(*dp)) { | |
1984 | if (dp + 1 != data + len || *dp != 0) { | |
1985 | size_t oplen; | |
1986 | snprintf(op, opleft, "\\%03o", *dp); | |
1987 | oplen = strlen(op); | |
1988 | op += oplen; | |
1989 | opleft -= oplen; | |
1990 | } | |
1991 | } else if (*dp == '"' || *dp == '\'' || *dp == '$' || | |
1992 | *dp == '`' || *dp == '\\') { | |
1993 | *op++ = '\\'; | |
1994 | *op++ = *dp; | |
1995 | opleft -= 2; | |
1996 | } else { | |
1997 | *op++ = *dp; | |
1998 | opleft--; | |
1999 | } | |
2000 | } | |
2001 | if (opleft < 1) | |
2002 | goto toobig; | |
2003 | *op = 0; | |
2004 | return optbuf; | |
2005 | toobig: | |
2006 | warning("dhcp option too large"); | |
2007 | return "<error>"; | |
2008 | } | |
2009 | ||
2010 | int | |
2011 | fork_privchld(int fd, int fd2) | |
2012 | { | |
2013 | struct pollfd pfd[1]; | |
a05d48e6 | 2014 | int nfds, pfail = 0; |
846204b6 HT |
2015 | |
2016 | switch (fork()) { | |
2017 | case -1: | |
2018 | error("cannot fork"); | |
2019 | break; | |
2020 | case 0: | |
2021 | break; | |
2022 | default: | |
2023 | return (0); | |
2024 | } | |
2025 | ||
2026 | if (chdir("/") == -1) | |
2027 | error("chdir(\"/\")"); | |
2028 | ||
2029 | setproctitle("%s [priv]", ifi->name); | |
2030 | ||
2031 | dup2(nullfd, STDIN_FILENO); | |
2032 | dup2(nullfd, STDOUT_FILENO); | |
2033 | dup2(nullfd, STDERR_FILENO); | |
2034 | close(nullfd); | |
2035 | close(fd2); | |
2036 | ||
2037 | for (;;) { | |
2038 | pfd[0].fd = fd; | |
2039 | pfd[0].events = POLLIN; | |
2040 | if ((nfds = poll(pfd, 1, INFTIM)) == -1) | |
2041 | if (errno != EINTR) | |
2042 | error("poll error"); | |
2043 | ||
a05d48e6 SG |
2044 | /* |
2045 | * Handle temporary errors, but bail if they persist. | |
2046 | */ | |
2047 | if (nfds == 0 || !(pfd[0].revents & POLLIN)) { | |
2048 | if (pfail > POLL_FAILURES) | |
2049 | error("poll failed > %d times", POLL_FAILURES); | |
2050 | sleep(pfail * POLL_FAILURE_WAIT); | |
2051 | pfail++; | |
846204b6 | 2052 | continue; |
a05d48e6 | 2053 | } |
846204b6 HT |
2054 | |
2055 | dispatch_imsg(fd); | |
2056 | } | |
2057 | } | |
f96419f4 AHJ |
2058 | |
2059 | void | |
2060 | get_ifname(char *ifname, char *arg) | |
2061 | { | |
2062 | struct ifgroupreq ifgr; | |
2063 | struct ifg_req *ifg; | |
2064 | int s, len; | |
2065 | ||
2066 | if (!strcmp(arg, "egress")) { | |
2067 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
2068 | if (s == -1) | |
2069 | error("socket error"); | |
2070 | bzero(&ifgr, sizeof(ifgr)); | |
2071 | strlcpy(ifgr.ifgr_name, "egress", sizeof(ifgr.ifgr_name)); | |
2072 | if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1) { | |
2073 | if (errno == ENOENT) | |
2074 | error("no interface in group egress found"); | |
2075 | error("ioctl SIOCGIFGMEMB: %m"); | |
2076 | } | |
2077 | len = ifgr.ifgr_len; | |
2078 | if ((ifgr.ifgr_groups = calloc(1, len)) == NULL) | |
2079 | error("get_ifname"); | |
2080 | if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1) | |
2081 | error("ioctl SIOCGIFGMEMB: %m"); | |
2082 | ||
2083 | arg = NULL; | |
2084 | for (ifg = ifgr.ifgr_groups; | |
2085 | ifg && len >= sizeof(struct ifg_req); ifg++) { | |
2086 | len -= sizeof(struct ifg_req); | |
2087 | if (arg) | |
2088 | error("too many interfaces in group egress"); | |
2089 | arg = ifg->ifgrq_member; | |
2090 | } | |
2091 | ||
2092 | if (strlcpy(ifi->name, arg, IFNAMSIZ) >= IFNAMSIZ) | |
2093 | error("Interface name too long: %m"); | |
2094 | ||
2095 | free(ifgr.ifgr_groups); | |
2096 | close(s); | |
2097 | } else if (strlcpy(ifi->name, arg, IFNAMSIZ) >= IFNAMSIZ) | |
2098 | error("Interface name too long"); | |
2099 | } |