1 /* $OpenBSD: dhcpleased.c,v 1.39 2024/11/21 13:35:20 claudio Exp $ */
2
3 /*
4 * Copyright (c) 2017, 2021 Florian Obser <florian@openbsd.org>
5 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
6 * Copyright (c) 2004 Esben Norby <norby@openbsd.org>
7 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
8 *
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 */
21 #include <sys/types.h>
22 #include <sys/ioctl.h>
23 #include <sys/queue.h>
24 #include <sys/socket.h>
25 #include <sys/stat.h>
26 #include <sys/syslog.h>
27 #include <sys/sysctl.h>
28 #include <sys/uio.h>
29 #include <sys/wait.h>
30
31 #include <net/if.h>
32 #include <net/route.h>
33 #include <net/if_dl.h>
34 #include <netinet/in.h>
35 #include <netinet/if_ether.h>
36 #include <netinet/in_var.h>
37
38 #include <arpa/inet.h>
39
40 #include <err.h>
41 #include <errno.h>
42 #include <fcntl.h>
43 #include <event.h>
44 #include <ifaddrs.h>
45 #include <imsg.h>
46 #include <netdb.h>
47 #include <pwd.h>
48 #include <stddef.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <signal.h>
53 #include <unistd.h>
54
55 #include "bpf.h"
56 #include "log.h"
57 #include "dhcpleased.h"
58 #include "frontend.h"
59 #include "engine.h"
60 #include "control.h"
61
62 enum dhcpleased_process {
63 PROC_MAIN,
64 PROC_ENGINE,
65 PROC_FRONTEND
66 };
67
68 __dead void usage(void);
69 __dead void main_shutdown(void);
70
71 void main_sig_handler(int, short, void *);
72
73 static pid_t start_child(enum dhcpleased_process, char *, int, int, int);
74
75 void main_dispatch_frontend(int, short, void *);
76 void main_dispatch_engine(int, short, void *);
77 void open_bpfsock(uint32_t);
78 void configure_interface(struct imsg_configure_interface *);
79 void deconfigure_interface(struct imsg_configure_interface *);
80 void propose_rdns(struct imsg_propose_rdns *);
81 void configure_routes(uint8_t, struct imsg_configure_interface *);
82 void configure_route(uint8_t, uint32_t, int, struct sockaddr_in *, struct
83 sockaddr_in *, struct sockaddr_in *, struct sockaddr_in *, int);
84 void read_lease_file(struct imsg_ifinfo *);
85
86 static int main_imsg_send_ipc_sockets(struct imsgbuf *, struct imsgbuf *);
87 int main_imsg_compose_frontend(int, int, void *, uint16_t);
88 int main_imsg_compose_engine(int, int, void *, uint16_t);
89
90 #ifndef SMALL
91 int main_imsg_send_config(struct dhcpleased_conf *);
92 #endif /* SMALL */
93 int main_reload(void);
94
95 static struct imsgev *iev_frontend;
96 static struct imsgev *iev_engine;
97
98 #ifndef SMALL
99 struct dhcpleased_conf *main_conf;
100 #endif
101 const char default_conffile[] = _PATH_CONF_FILE;
102 const char *conffile = default_conffile;
103 pid_t frontend_pid;
104 pid_t engine_pid;
105
106 int routesock, ioctl_sock, rtm_seq, no_lease_files;
107
108 void
main_sig_handler(int sig,short event,void * arg)109 main_sig_handler(int sig, short event, void *arg)
110 {
111 /*
112 * Normal signal handler rules don't apply because libevent
113 * decouples for us.
114 */
115
116 switch (sig) {
117 case SIGTERM:
118 case SIGINT:
119 main_shutdown();
120 case SIGHUP:
121 #ifndef SMALL
122 if (main_reload() == -1)
123 log_warnx("configuration reload failed");
124 else
125 log_debug("configuration reloaded");
126 #endif /* SMALL */
127 break;
128 default:
129 fatalx("unexpected signal");
130 }
131 }
132
133 __dead void
usage(void)134 usage(void)
135 {
136 extern char *__progname;
137
138 fprintf(stderr, "usage: %s [-dnv] [-f file] [-s socket]\n",
139 __progname);
140 exit(1);
141 }
142
143 int
main(int argc,char * argv[])144 main(int argc, char *argv[])
145 {
146 struct event ev_sigint, ev_sigterm, ev_sighup;
147 int ch;
148 int debug = 0, engine_flag = 0, frontend_flag = 0;
149 int verbose = 0, no_action = 0;
150 char *saved_argv0;
151 int pipe_main2frontend[2];
152 int pipe_main2engine[2];
153 int frontend_routesock, rtfilter, lockfd;
154 int rtable_any = RTABLE_ANY;
155 char *csock = _PATH_DHCPLEASED_SOCKET;
156 #ifndef SMALL
157 int control_fd;
158 #endif /* SMALL */
159
160 log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
161 log_setverbose(1);
162
163 saved_argv0 = argv[0];
164 if (saved_argv0 == NULL)
165 saved_argv0 = "dhcpleased";
166
167 while ((ch = getopt(argc, argv, "dEFf:ns:v")) != -1) {
168 switch (ch) {
169 case 'd':
170 debug = 1;
171 break;
172 case 'E':
173 engine_flag = 1;
174 break;
175 case 'F':
176 frontend_flag = 1;
177 break;
178 case 'f':
179 conffile = optarg;
180 break;
181 case 'n':
182 no_action = 1;
183 break;
184 case 's':
185 csock = optarg;
186 break;
187 case 'v':
188 verbose++;
189 break;
190 default:
191 usage();
192 }
193 }
194
195 argc -= optind;
196 argv += optind;
197 if (argc > 0 || (engine_flag && frontend_flag))
198 usage();
199
200 if (engine_flag)
201 engine(debug, verbose);
202 else if (frontend_flag)
203 frontend(debug, verbose);
204
205 #ifndef SMALL
206 /* parse config file */
207 if ((main_conf = parse_config(conffile)) == NULL)
208 exit(1);
209
210 if (no_action) {
211 if (verbose)
212 print_config(main_conf);
213 else
214 fprintf(stderr, "configuration OK\n");
215 exit(0);
216 }
217 #endif /* SMALL */
218
219 /* Check for root privileges. */
220 if (geteuid())
221 errx(1, "need root privileges");
222
223 lockfd = open(_PATH_LOCKFILE, O_CREAT|O_RDWR|O_EXLOCK|O_NONBLOCK, 0600);
224 if (lockfd == -1) {
225 if (errno == EAGAIN)
226 errx(1, "already running");
227 err(1, "%s", _PATH_LOCKFILE);
228 }
229
230 /* Check for assigned daemon user */
231 if (getpwnam(DHCPLEASED_USER) == NULL)
232 errx(1, "unknown user %s", DHCPLEASED_USER);
233
234 log_init(debug, LOG_DAEMON);
235 log_setverbose(verbose);
236
237 if (!debug)
238 daemon(0, 0);
239
240 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
241 PF_UNSPEC, pipe_main2frontend) == -1)
242 fatal("main2frontend socketpair");
243 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
244 PF_UNSPEC, pipe_main2engine) == -1)
245 fatal("main2engine socketpair");
246
247 /* Start children. */
248 engine_pid = start_child(PROC_ENGINE, saved_argv0, pipe_main2engine[1],
249 debug, verbose);
250 frontend_pid = start_child(PROC_FRONTEND, saved_argv0,
251 pipe_main2frontend[1], debug, verbose);
252
253 log_procinit("main");
254
255 if ((routesock = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC |
256 SOCK_NONBLOCK, AF_INET)) == -1)
257 fatal("route socket");
258 shutdown(routesock, SHUT_RD);
259
260 event_init();
261
262 /* Setup signal handler. */
263 signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
264 signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
265 signal_set(&ev_sighup, SIGHUP, main_sig_handler, NULL);
266 signal_add(&ev_sigint, NULL);
267 signal_add(&ev_sigterm, NULL);
268 signal_add(&ev_sighup, NULL);
269 signal(SIGPIPE, SIG_IGN);
270
271 /* Setup pipes to children. */
272
273 if ((iev_frontend = malloc(sizeof(struct imsgev))) == NULL ||
274 (iev_engine = malloc(sizeof(struct imsgev))) == NULL)
275 fatal(NULL);
276 if (imsgbuf_init(&iev_frontend->ibuf, pipe_main2frontend[0]) == -1)
277 fatal(NULL);
278 imsgbuf_allow_fdpass(&iev_frontend->ibuf);
279 iev_frontend->handler = main_dispatch_frontend;
280 if (imsgbuf_init(&iev_engine->ibuf, pipe_main2engine[0]) == -1)
281 fatal(NULL);
282 imsgbuf_allow_fdpass(&iev_engine->ibuf);
283 iev_engine->handler = main_dispatch_engine;
284
285 /* Setup event handlers for pipes to engine & frontend. */
286 iev_frontend->events = EV_READ;
287 event_set(&iev_frontend->ev, iev_frontend->ibuf.fd,
288 iev_frontend->events, iev_frontend->handler, iev_frontend);
289 event_add(&iev_frontend->ev, NULL);
290
291 iev_engine->events = EV_READ;
292 event_set(&iev_engine->ev, iev_engine->ibuf.fd, iev_engine->events,
293 iev_engine->handler, iev_engine);
294 event_add(&iev_engine->ev, NULL);
295
296 if (main_imsg_send_ipc_sockets(&iev_frontend->ibuf, &iev_engine->ibuf))
297 fatal("could not establish imsg links");
298
299 if ((ioctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0)) == -1)
300 fatal("socket");
301
302 if ((frontend_routesock = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC,
303 AF_INET)) == -1)
304 fatal("route socket");
305
306 rtfilter = ROUTE_FILTER(RTM_IFINFO) | ROUTE_FILTER(RTM_PROPOSAL) |
307 ROUTE_FILTER(RTM_IFANNOUNCE);
308 if (setsockopt(frontend_routesock, AF_ROUTE, ROUTE_MSGFILTER,
309 &rtfilter, sizeof(rtfilter)) == -1)
310 fatal("setsockopt(ROUTE_MSGFILTER)");
311 if (setsockopt(frontend_routesock, AF_ROUTE, ROUTE_TABLEFILTER,
312 &rtable_any, sizeof(rtable_any)) == -1)
313 fatal("setsockopt(ROUTE_TABLEFILTER)");
314
315 #ifndef SMALL
316 if ((control_fd = control_init(csock)) == -1)
317 warnx("control socket setup failed");
318 #endif /* SMALL */
319
320 if (unveil(conffile, "r") == -1)
321 fatal("unveil %s", conffile);
322 if (unveil("/dev/bpf", "rw") == -1)
323 fatal("unveil /dev/bpf");
324
325 if (unveil(_PATH_LEASE, "rwc") == -1) {
326 no_lease_files = 1;
327 log_warn("disabling lease files, unveil " _PATH_LEASE);
328 }
329
330 if (unveil(NULL, NULL) == -1)
331 fatal("unveil");
332 #if notyet
333 if (pledge("stdio inet rpath wpath sendfd wroute bpf", NULL) == -1)
334 fatal("pledge");
335 #endif
336 main_imsg_compose_frontend(IMSG_ROUTESOCK, frontend_routesock, NULL, 0);
337
338 #ifndef SMALL
339 if (control_fd != -1)
340 main_imsg_compose_frontend(IMSG_CONTROLFD, control_fd, NULL, 0);
341 main_imsg_send_config(main_conf);
342 #endif /* SMALL */
343
344 main_imsg_compose_frontend(IMSG_STARTUP, -1, NULL, 0);
345
346 event_dispatch();
347
348 main_shutdown();
349 return (0);
350 }
351
352 __dead void
main_shutdown(void)353 main_shutdown(void)
354 {
355 pid_t pid;
356 int status;
357
358 /* Close pipes. */
359 imsgbuf_clear(&iev_frontend->ibuf);
360 close(iev_frontend->ibuf.fd);
361 imsgbuf_clear(&iev_engine->ibuf);
362 close(iev_engine->ibuf.fd);
363
364 #ifndef SMALL
365 config_clear(main_conf);
366 #endif /* SMALL */
367
368 log_debug("waiting for children to terminate");
369 do {
370 pid = wait(&status);
371 if (pid == -1) {
372 if (errno != EINTR && errno != ECHILD)
373 fatal("wait");
374 } else if (WIFSIGNALED(status))
375 log_warnx("%s terminated; signal %d",
376 (pid == engine_pid) ? "engine" :
377 "frontend", WTERMSIG(status));
378 } while (pid != -1 || (pid == -1 && errno == EINTR));
379
380 free(iev_frontend);
381 free(iev_engine);
382
383 log_info("terminating");
384 exit(0);
385 }
386
387 static pid_t
start_child(enum dhcpleased_process p,char * argv0,int fd,int debug,int verbose)388 start_child(enum dhcpleased_process p, char *argv0, int fd, int debug, int
389 verbose)
390 {
391 char *argv[7];
392 int argc = 0;
393 pid_t pid;
394
395 switch (pid = fork()) {
396 case -1:
397 fatal("cannot fork");
398 case 0:
399 break;
400 default:
401 close(fd);
402 return (pid);
403 }
404
405 if (fd != 3) {
406 if (dup2(fd, 3) == -1)
407 fatal("cannot setup imsg fd");
408 } else if (fcntl(fd, F_SETFD, 0) == -1)
409 fatal("cannot setup imsg fd");
410
411 argv[argc++] = argv0;
412 switch (p) {
413 case PROC_MAIN:
414 fatalx("Can not start main process");
415 case PROC_ENGINE:
416 argv[argc++] = "-E";
417 break;
418 case PROC_FRONTEND:
419 argv[argc++] = "-F";
420 break;
421 }
422 if (debug)
423 argv[argc++] = "-d";
424 if (verbose)
425 argv[argc++] = "-v";
426 if (verbose > 1)
427 argv[argc++] = "-v";
428 argv[argc++] = NULL;
429
430 execvp(argv0, argv);
431 fatal("execvp");
432 }
433
434 void
main_dispatch_frontend(int fd,short event,void * bula)435 main_dispatch_frontend(int fd, short event, void *bula)
436 {
437 struct imsgev *iev = bula;
438 struct imsgbuf *ibuf;
439 struct imsg imsg;
440 struct imsg_ifinfo imsg_ifinfo;
441 ssize_t n;
442 int shut = 0;
443 uint32_t if_index, type;
444 #ifndef SMALL
445 int verbose;
446 #endif /* SMALL */
447
448 ibuf = &iev->ibuf;
449
450 if (event & EV_READ) {
451 if ((n = imsgbuf_read(ibuf)) == -1)
452 fatal("imsgbuf_read error");
453 if (n == 0) /* Connection closed. */
454 shut = 1;
455 }
456 if (event & EV_WRITE) {
457 if (imsgbuf_write(ibuf) == -1) {
458 if (errno == EPIPE) /* Connection closed. */
459 shut = 1;
460 else
461 fatal("imsgbuf_write");
462 }
463 }
464
465 for (;;) {
466 if ((n = imsg_get(ibuf, &imsg)) == -1)
467 fatal("imsg_get");
468 if (n == 0) /* No more messages. */
469 break;
470
471 type = imsg_get_type(&imsg);
472
473 switch (type) {
474 case IMSG_OPEN_BPFSOCK:
475 if (imsg_get_data(&imsg, &if_index,
476 sizeof(if_index)) == -1)
477 fatalx("%s: invalid %s", __func__, i2s(type));
478
479 open_bpfsock(if_index);
480 break;
481 #ifndef SMALL
482 case IMSG_CTL_RELOAD:
483 if (main_reload() == -1)
484 log_warnx("configuration reload failed");
485 else
486 log_warnx("configuration reloaded");
487 break;
488 case IMSG_CTL_LOG_VERBOSE:
489 if (imsg_get_data(&imsg, &verbose,
490 sizeof(verbose)) == -1)
491 fatalx("%s: invalid %s", __func__, i2s(type));
492
493 log_setverbose(verbose);
494 break;
495 #endif /* SMALL */
496 case IMSG_UPDATE_IF:
497 if (imsg_get_data(&imsg, &imsg_ifinfo,
498 sizeof(imsg_ifinfo)) == -1)
499 fatalx("%s: invalid %s", __func__, i2s(type));
500
501 read_lease_file(&imsg_ifinfo);
502 main_imsg_compose_engine(IMSG_UPDATE_IF, -1,
503 &imsg_ifinfo, sizeof(imsg_ifinfo));
504 break;
505 default:
506 log_debug("%s: error handling imsg %d", __func__, type);
507 break;
508 }
509 imsg_free(&imsg);
510 }
511 if (!shut)
512 imsg_event_add(iev);
513 else {
514 /* This pipe is dead. Remove its event handler */
515 event_del(&iev->ev);
516 event_loopexit(NULL);
517 }
518 }
519
520 void
main_dispatch_engine(int fd,short event,void * bula)521 main_dispatch_engine(int fd, short event, void *bula)
522 {
523 struct imsgev *iev = bula;
524 struct imsgbuf *ibuf;
525 struct imsg imsg;
526 ssize_t n;
527 uint32_t type;
528 int shut = 0;
529
530 ibuf = &iev->ibuf;
531
532 if (event & EV_READ) {
533 if ((n = imsgbuf_read(ibuf)) == -1)
534 fatal("imsgbuf_read error");
535 if (n == 0) /* Connection closed. */
536 shut = 1;
537 }
538 if (event & EV_WRITE) {
539 if (imsgbuf_write(ibuf) == -1) {
540 if (errno == EPIPE) /* Connection closed. */
541 shut = 1;
542 else
543 fatal("imsgbuf_write");
544 }
545 }
546
547 for (;;) {
548 if ((n = imsg_get(ibuf, &imsg)) == -1)
549 fatal("imsg_get");
550 if (n == 0) /* No more messages. */
551 break;
552
553 type = imsg_get_type(&imsg);
554
555 switch (type) {
556 case IMSG_CONFIGURE_INTERFACE: {
557 struct imsg_configure_interface imsg_interface;
558
559 if (imsg_get_data(&imsg, &imsg_interface,
560 sizeof(imsg_interface)) == -1)
561 fatalx("%s: invalid %s", __func__, i2s(type));
562
563 if (imsg_interface.routes_len >= MAX_DHCP_ROUTES)
564 fatalx("%s: too many routes in imsg", __func__);
565 configure_interface(&imsg_interface);
566 break;
567 }
568 case IMSG_DECONFIGURE_INTERFACE: {
569 struct imsg_configure_interface imsg_interface;
570
571 if (imsg_get_data(&imsg, &imsg_interface,
572 sizeof(imsg_interface)) == -1)
573 fatalx("%s: invalid %s", __func__, i2s(type));
574 if (imsg_interface.routes_len >= MAX_DHCP_ROUTES)
575 fatalx("%s: too many routes in imsg", __func__);
576
577 deconfigure_interface(&imsg_interface);
578 main_imsg_compose_frontend(IMSG_CLOSE_UDPSOCK, -1,
579 &imsg_interface.if_index,
580 sizeof(imsg_interface.if_index));
581 break;
582 }
583 case IMSG_WITHDRAW_ROUTES: {
584 struct imsg_configure_interface imsg_interface;
585
586 if (imsg_get_data(&imsg, &imsg_interface,
587 sizeof(imsg_interface)) == -1)
588 fatalx("%s: invalid %s", __func__, i2s(type));
589 if (imsg_interface.routes_len >= MAX_DHCP_ROUTES)
590 fatalx("%s: too many routes in imsg", __func__);
591
592 if (imsg_interface.routes_len > 0)
593 configure_routes(RTM_DELETE, &imsg_interface);
594 break;
595 }
596 case IMSG_PROPOSE_RDNS: {
597 struct imsg_propose_rdns rdns;
598
599 if (imsg_get_data(&imsg, &rdns, sizeof(rdns)) == -1)
600 fatalx("%s: invalid %s", __func__, i2s(type));
601 if ((2 + rdns.rdns_count * sizeof(struct in_addr)) >
602 sizeof(struct sockaddr_rtdns))
603 fatalx("%s: rdns_count too big: %d", __func__,
604 rdns.rdns_count);
605
606 propose_rdns(&rdns);
607 break;
608 }
609 case IMSG_WITHDRAW_RDNS: {
610 struct imsg_propose_rdns rdns;
611
612 if (imsg_get_data(&imsg, &rdns, sizeof(rdns)) == -1)
613 fatalx("%s: invalid %s", __func__, i2s(type));
614 if (rdns.rdns_count != 0)
615 fatalx("%s: expected rdns_count == 0: %d",
616 __func__, rdns.rdns_count);
617
618 propose_rdns(&rdns);
619 break;
620 }
621 default:
622 log_debug("%s: error handling imsg %d", __func__, type);
623 break;
624 }
625 imsg_free(&imsg);
626 }
627 if (!shut)
628 imsg_event_add(iev);
629 else {
630 /* This pipe is dead. Remove its event handler. */
631 event_del(&iev->ev);
632 event_loopexit(NULL);
633 }
634 }
635
636 int
main_imsg_compose_frontend(int type,int fd,void * data,uint16_t datalen)637 main_imsg_compose_frontend(int type, int fd, void *data, uint16_t datalen)
638 {
639 if (iev_frontend)
640 return (imsg_compose_event(iev_frontend, type, 0, 0, fd, data,
641 datalen));
642 else
643 return (-1);
644 }
645
646 int
main_imsg_compose_engine(int type,int fd,void * data,uint16_t datalen)647 main_imsg_compose_engine(int type, int fd, void *data, uint16_t datalen)
648 {
649 if (iev_engine)
650 return(imsg_compose_event(iev_engine, type, 0, 0, fd, data,
651 datalen));
652 else
653 return (-1);
654 }
655
656 void
imsg_event_add(struct imsgev * iev)657 imsg_event_add(struct imsgev *iev)
658 {
659 iev->events = EV_READ;
660 if (imsgbuf_queuelen(&iev->ibuf) > 0)
661 iev->events |= EV_WRITE;
662
663 event_del(&iev->ev);
664 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
665 event_add(&iev->ev, NULL);
666 }
667
668 int
imsg_compose_event(struct imsgev * iev,uint16_t type,uint32_t peerid,pid_t pid,int fd,void * data,uint16_t datalen)669 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
670 pid_t pid, int fd, void *data, uint16_t datalen)
671 {
672 int ret;
673
674 if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
675 datalen)) != -1)
676 imsg_event_add(iev);
677
678 return (ret);
679 }
680
681 int
imsg_forward_event(struct imsgev * iev,struct imsg * imsg)682 imsg_forward_event(struct imsgev *iev, struct imsg *imsg)
683 {
684 int ret;
685
686 if ((ret = imsg_forward(&iev->ibuf, imsg)) != -1)
687 imsg_event_add(iev);
688
689 return (ret);
690 }
691
692 static int
main_imsg_send_ipc_sockets(struct imsgbuf * frontend_buf,struct imsgbuf * engine_buf)693 main_imsg_send_ipc_sockets(struct imsgbuf *frontend_buf,
694 struct imsgbuf *engine_buf)
695 {
696 int pipe_frontend2engine[2];
697
698 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
699 PF_UNSPEC, pipe_frontend2engine) == -1)
700 return (-1);
701
702 if (imsg_compose(frontend_buf, IMSG_SOCKET_IPC, 0, 0,
703 pipe_frontend2engine[0], NULL, 0) == -1)
704 return (-1);
705 imsgbuf_flush(frontend_buf);
706 if (imsg_compose(engine_buf, IMSG_SOCKET_IPC, 0, 0,
707 pipe_frontend2engine[1], NULL, 0) == -1)
708 return (-1);
709 imsgbuf_flush(engine_buf);
710 return (0);
711 }
712
713 #ifndef SMALL
714 int
main_reload(void)715 main_reload(void)
716 {
717 struct dhcpleased_conf *xconf;
718
719 if ((xconf = parse_config(conffile)) == NULL)
720 return (-1);
721
722 if (main_imsg_send_config(xconf) == -1)
723 return (-1);
724
725 merge_config(main_conf, xconf);
726
727 return (0);
728 }
729
730 int
main_imsg_send_config(struct dhcpleased_conf * xconf)731 main_imsg_send_config(struct dhcpleased_conf *xconf)
732 {
733 struct iface_conf *iface_conf;
734
735 main_imsg_compose_frontend(IMSG_RECONF_CONF, -1, NULL, 0);
736 main_imsg_compose_engine(IMSG_RECONF_CONF, -1, NULL, 0);
737
738 /* Send the interface list to the frontend & engine. */
739 SIMPLEQ_FOREACH(iface_conf, &xconf->iface_list, entry) {
740 main_imsg_compose_frontend(IMSG_RECONF_IFACE, -1, iface_conf,
741 sizeof(*iface_conf));
742 main_imsg_compose_engine(IMSG_RECONF_IFACE, -1, iface_conf,
743 sizeof(*iface_conf));
744 if (iface_conf->vc_id_len) {
745 main_imsg_compose_frontend(IMSG_RECONF_VC_ID, -1,
746 iface_conf->vc_id, iface_conf->vc_id_len);
747 main_imsg_compose_engine(IMSG_RECONF_VC_ID, -1,
748 iface_conf->vc_id, iface_conf->vc_id_len);
749 }
750 if (iface_conf->c_id_len) {
751 main_imsg_compose_frontend(IMSG_RECONF_C_ID, -1,
752 iface_conf->c_id, iface_conf->c_id_len);
753 main_imsg_compose_engine(IMSG_RECONF_C_ID, -1,
754 iface_conf->c_id, iface_conf->c_id_len);
755 }
756 if (iface_conf->h_name != NULL)
757 main_imsg_compose_frontend(IMSG_RECONF_H_NAME, -1,
758 iface_conf->h_name, strlen(iface_conf->h_name) + 1);
759 }
760
761 /* Config is now complete. */
762 main_imsg_compose_frontend(IMSG_RECONF_END, -1, NULL, 0);
763 main_imsg_compose_engine(IMSG_RECONF_END, -1, NULL, 0);
764
765 return (0);
766 }
767 #endif /* SMALL */
768
769 void
configure_interface(struct imsg_configure_interface * imsg)770 configure_interface(struct imsg_configure_interface *imsg)
771 {
772 struct ifaliasreq ifaliasreq;
773 struct ifaddrs *ifap, *ifa;
774 struct sockaddr_in *req_sin_addr, *req_sin_mask;
775 int found = 0, udpsock, opt = 1, len, fd = -1;
776 char *if_name;
777 char ip_ntop_buf[INET_ADDRSTRLEN];
778 char nextserver_ntop_buf[INET_ADDRSTRLEN];
779 char lease_buf[LEASE_SIZE];
780 char lease_file_buf[sizeof(_PATH_LEASE) +
781 IF_NAMESIZE];
782 char tmpl[] = _PATH_LEASE"XXXXXXXXXX";
783
784 memset(&ifaliasreq, 0, sizeof(ifaliasreq));
785
786 if_name = if_indextoname(imsg->if_index, ifaliasreq.ifra_name);
787 if (if_name == NULL) {
788 log_warnx("%s: cannot find interface %d", __func__,
789 imsg->if_index);
790 return;
791 }
792
793 log_debug("%s %s", __func__, if_name);
794
795 if (getifaddrs(&ifap) != 0)
796 fatal("getifaddrs");
797
798 req_sin_addr = (struct sockaddr_in *)&ifaliasreq.ifra_addr;
799 req_sin_addr->sin_family = AF_INET;
800 req_sin_addr->sin_len = sizeof(*req_sin_addr);
801
802 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
803 struct in_addr addr, mask;
804
805 if (strcmp(if_name, ifa->ifa_name) != 0)
806 continue;
807 if (ifa->ifa_addr == NULL)
808 continue;
809 if (ifa->ifa_addr->sa_family != AF_INET)
810 continue;
811
812 addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
813 mask = ((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
814
815 if (imsg->addr.s_addr == addr.s_addr) {
816 if (imsg->mask.s_addr == mask.s_addr)
817 found = 1;
818 else {
819 req_sin_addr->sin_addr = addr;
820 if (ioctl(ioctl_sock, SIOCDIFADDR, &ifaliasreq)
821 == -1) {
822 if (errno != EADDRNOTAVAIL)
823 log_warn("SIOCDIFADDR");
824 }
825 }
826 break;
827 }
828 }
829 freeifaddrs(ifap);
830
831 req_sin_addr->sin_addr = imsg->addr;
832 if (!found) {
833 req_sin_mask = (struct sockaddr_in *)&ifaliasreq.ifra_mask;
834 req_sin_mask->sin_family = AF_INET;
835 req_sin_mask->sin_len = sizeof(*req_sin_mask);
836 req_sin_mask->sin_addr = imsg->mask;
837 if (ioctl(ioctl_sock, SIOCAIFADDR, &ifaliasreq) == -1)
838 log_warn("SIOCAIFADDR");
839 }
840 if (imsg->routes_len > 0)
841 configure_routes(RTM_ADD, imsg);
842
843 req_sin_addr->sin_port = ntohs(CLIENT_PORT);
844 if ((udpsock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
845 log_warn("socket");
846 return;
847 }
848 if (setsockopt(udpsock, SOL_SOCKET, SO_REUSEADDR, &opt,
849 sizeof(opt)) == -1)
850 log_warn("setting SO_REUSEADDR on socket");
851
852 if (setsockopt(udpsock, SOL_SOCKET, SO_RTABLE, &imsg->rdomain,
853 sizeof(imsg->rdomain)) == -1) {
854 /* we might race against removal of the rdomain */
855 log_warn("setsockopt SO_RTABLE");
856 close(udpsock);
857 return;
858 }
859
860 if (bind(udpsock, (struct sockaddr *)req_sin_addr,
861 sizeof(*req_sin_addr)) == -1) {
862 close(udpsock);
863 return;
864 }
865
866 shutdown(udpsock, SHUT_RD);
867
868 main_imsg_compose_frontend(IMSG_UDPSOCK, udpsock,
869 &imsg->if_index, sizeof(imsg->if_index));
870
871 if (no_lease_files)
872 return;
873
874 if (inet_ntop(AF_INET, &imsg->addr, ip_ntop_buf, sizeof(ip_ntop_buf)) ==
875 NULL) {
876 log_warn("%s: inet_ntop", __func__);
877 return;
878 }
879
880 if (imsg->siaddr.s_addr == INADDR_ANY)
881 nextserver_ntop_buf[0] = '\0';
882 else {
883 if (inet_ntop(AF_INET, &imsg->siaddr, nextserver_ntop_buf,
884 sizeof(nextserver_ntop_buf)) == NULL) {
885 log_warn("%s: inet_ntop", __func__);
886 return;
887 }
888 }
889 len = snprintf(lease_file_buf, sizeof(lease_file_buf), "%s%s",
890 _PATH_LEASE, if_name);
891 if ( len == -1 || (size_t) len >= sizeof(lease_file_buf)) {
892 log_warnx("%s: failed to encode lease path for %s", __func__,
893 if_name);
894 return;
895 }
896
897 len = snprintf(lease_buf, sizeof(lease_buf),
898 "%s\n%s%s\n%s%s\n%s%s\n%s%s\n%s%s\n",
899 LEASE_VERSION, LEASE_IP_PREFIX, ip_ntop_buf,
900 LEASE_NEXTSERVER_PREFIX, nextserver_ntop_buf, LEASE_BOOTFILE_PREFIX,
901 imsg->file, LEASE_HOSTNAME_PREFIX, imsg->hostname,
902 LEASE_DOMAIN_PREFIX, imsg->domainname);
903 if ( len == -1 || (size_t) len >= sizeof(lease_buf)) {
904 log_warnx("%s: failed to encode lease for %s", __func__,
905 ip_ntop_buf);
906 return;
907 }
908
909 if ((fd = mkstemp(tmpl)) == -1) {
910 log_warn("%s: mkstemp", __func__);
911 return;
912 }
913
914 if (write(fd, lease_buf, len) < len)
915 goto err;
916
917 if (fchmod(fd, 0644) == -1)
918 goto err;
919
920 if (close(fd) == -1)
921 goto err;
922 fd = -1;
923
924 if (rename(tmpl, lease_file_buf) == -1)
925 goto err;
926 return;
927 err:
928 log_warn("%s", __func__);
929 if (fd != -1)
930 close(fd);
931 unlink(tmpl);
932 }
933
934 void
deconfigure_interface(struct imsg_configure_interface * imsg)935 deconfigure_interface(struct imsg_configure_interface *imsg)
936 {
937 struct ifaliasreq ifaliasreq;
938 struct sockaddr_in *req_sin_addr;
939
940 memset(&ifaliasreq, 0, sizeof(ifaliasreq));
941
942 #if 0
943 /*
944 * When two default routes have the same gateway the kernel always
945 * deletes the first which might be the wrong one. When we then
946 * deconfigure the IP address from the interface the kernel deletes
947 * all routes pointing out that interface and we end up with no
948 * default.
949 * This can happen with a wired & wireless interface on the same
950 * layer 2 network and the user issues ifconfig $WIFI inet -autoconf.
951 * Work around this issue by not deleting the default route and let
952 * the kernel handle it when we remove the IP address a few lines
953 * down.
954 */
955 if (imsg->routes_len > 0)
956 configure_routes(RTM_DELETE, imsg);
957 #endif
958
959 if (if_indextoname(imsg->if_index, ifaliasreq.ifra_name) == NULL) {
960 log_warnx("%s: cannot find interface %d", __func__,
961 imsg->if_index);
962 return;
963 }
964
965 log_debug("%s %s", __func__, ifaliasreq.ifra_name);
966
967 req_sin_addr = (struct sockaddr_in *)&ifaliasreq.ifra_addr;
968 req_sin_addr->sin_family = AF_INET;
969 req_sin_addr->sin_len = sizeof(*req_sin_addr);
970
971 req_sin_addr->sin_addr = imsg->addr;
972 if (ioctl(ioctl_sock, SIOCDIFADDR, &ifaliasreq) == -1) {
973 if (errno != EADDRNOTAVAIL)
974 log_warn("SIOCDIFADDR");
975 }
976 }
977
978 void
configure_routes(uint8_t rtm_type,struct imsg_configure_interface * imsg)979 configure_routes(uint8_t rtm_type, struct imsg_configure_interface *imsg)
980 {
981 struct sockaddr_in dst, mask, gw, ifa;
982 in_addr_t addrnet, gwnet;
983 int i;
984
985 memset(&ifa, 0, sizeof(ifa));
986 ifa.sin_family = AF_INET;
987 ifa.sin_len = sizeof(ifa);
988 ifa.sin_addr = imsg->addr;
989
990 memset(&dst, 0, sizeof(dst));
991 dst.sin_family = AF_INET;
992 dst.sin_len = sizeof(dst);
993
994 memset(&mask, 0, sizeof(mask));
995 mask.sin_family = AF_INET;
996 mask.sin_len = sizeof(mask);
997
998 memset(&gw, 0, sizeof(gw));
999 gw.sin_family = AF_INET;
1000 gw.sin_len = sizeof(gw);
1001
1002 addrnet = imsg->addr.s_addr & imsg->mask.s_addr;
1003
1004 for (i = 0; i < imsg->routes_len; i++) {
1005 dst.sin_addr = imsg->routes[i].dst;
1006 mask.sin_addr = imsg->routes[i].mask;
1007 gw.sin_addr = imsg->routes[i].gw;
1008
1009 if (gw.sin_addr.s_addr == INADDR_ANY) {
1010 /* direct route */
1011 configure_route(rtm_type, imsg->if_index,
1012 imsg->rdomain, &dst, &mask, &ifa, NULL,
1013 RTF_CLONING);
1014 } else if (mask.sin_addr.s_addr == INADDR_ANY) {
1015 /* default route */
1016 gwnet = gw.sin_addr.s_addr & imsg->mask.s_addr;
1017 if (addrnet != gwnet) {
1018 /*
1019 * The gateway for the default route is outside
1020 * the configured prefix. Install a direct
1021 * cloning route for the gateway to make the
1022 * default route reachable.
1023 */
1024 mask.sin_addr.s_addr = 0xffffffff;
1025 configure_route(rtm_type, imsg->if_index,
1026 imsg->rdomain, &gw, &mask, &ifa, NULL,
1027 RTF_CLONING);
1028 mask.sin_addr = imsg->routes[i].mask;
1029 }
1030
1031 if (gw.sin_addr.s_addr == ifa.sin_addr.s_addr) {
1032 /* directly connected default */
1033 configure_route(rtm_type, imsg->if_index,
1034 imsg->rdomain, &dst, &mask, &gw, NULL, 0);
1035 } else {
1036 /* default route via gateway */
1037 configure_route(rtm_type, imsg->if_index,
1038 imsg->rdomain, &dst, &mask, &gw, &ifa,
1039 RTF_GATEWAY);
1040 }
1041 } else {
1042 /* non-default via gateway */
1043 configure_route(rtm_type, imsg->if_index, imsg->rdomain,
1044 &dst, &mask, &gw, NULL, RTF_GATEWAY);
1045 }
1046 }
1047 }
1048
1049 #define ROUNDUP(a) \
1050 (((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
1051 void
configure_route(uint8_t rtm_type,uint32_t if_index,int rdomain,struct sockaddr_in * dst,struct sockaddr_in * mask,struct sockaddr_in * gw,struct sockaddr_in * ifa,int rtm_flags)1052 configure_route(uint8_t rtm_type, uint32_t if_index, int rdomain, struct
1053 sockaddr_in *dst, struct sockaddr_in *mask, struct sockaddr_in *gw,
1054 struct sockaddr_in *ifa, int rtm_flags)
1055 {
1056 struct rt_msghdr rtm;
1057 struct sockaddr_dl ifp;
1058 struct sockaddr_rtlabel rl;
1059 struct iovec iov[14];
1060 long pad = 0;
1061 int iovcnt = 0, padlen;
1062
1063 memset(&rtm, 0, sizeof(rtm));
1064
1065 rtm.rtm_version = RTM_VERSION;
1066 rtm.rtm_type = rtm_type;
1067 rtm.rtm_msglen = sizeof(rtm);
1068 rtm.rtm_index = if_index;
1069 rtm.rtm_tableid = rdomain;
1070 rtm.rtm_seq = ++rtm_seq;
1071 rtm.rtm_priority = RTP_NONE;
1072 rtm.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK | RTA_IFP |
1073 RTA_LABEL;
1074 rtm.rtm_flags = RTF_UP | RTF_STATIC | RTF_MPATH | rtm_flags;
1075
1076 if (ifa)
1077 rtm.rtm_addrs |= RTA_IFA;
1078
1079 iov[iovcnt].iov_base = &rtm;
1080 iov[iovcnt++].iov_len = sizeof(rtm);
1081
1082 iov[iovcnt].iov_base = dst;
1083 iov[iovcnt++].iov_len = dst->sin_len;
1084 rtm.rtm_msglen += dst->sin_len;
1085 padlen = ROUNDUP(dst->sin_len) - dst->sin_len;
1086 if (padlen > 0) {
1087 iov[iovcnt].iov_base = &pad;
1088 iov[iovcnt++].iov_len = padlen;
1089 rtm.rtm_msglen += padlen;
1090 }
1091
1092 iov[iovcnt].iov_base = gw;
1093 iov[iovcnt++].iov_len = gw->sin_len;
1094 rtm.rtm_msglen += gw->sin_len;
1095 padlen = ROUNDUP(gw->sin_len) - gw->sin_len;
1096 if (padlen > 0) {
1097 iov[iovcnt].iov_base = &pad;
1098 iov[iovcnt++].iov_len = padlen;
1099 rtm.rtm_msglen += padlen;
1100 }
1101
1102 iov[iovcnt].iov_base = mask;
1103 iov[iovcnt++].iov_len = mask->sin_len;
1104 rtm.rtm_msglen += mask->sin_len;
1105 padlen = ROUNDUP(mask->sin_len) - mask->sin_len;
1106 if (padlen > 0) {
1107 iov[iovcnt].iov_base = &pad;
1108 iov[iovcnt++].iov_len = padlen;
1109 rtm.rtm_msglen += padlen;
1110 }
1111
1112 memset(&ifp, 0, sizeof(ifp));
1113 ifp.sdl_len = sizeof(struct sockaddr_dl);
1114 ifp.sdl_family = AF_LINK;
1115 ifp.sdl_index = if_index;
1116 iov[iovcnt].iov_base = &ifp;
1117 iov[iovcnt++].iov_len = sizeof(ifp);
1118 rtm.rtm_msglen += sizeof(ifp);
1119 padlen = ROUNDUP(sizeof(ifp)) - sizeof(ifp);
1120 if (padlen > 0) {
1121 iov[iovcnt].iov_base = &pad;
1122 iov[iovcnt++].iov_len = padlen;
1123 rtm.rtm_msglen += padlen;
1124 }
1125
1126 if (ifa) {
1127 iov[iovcnt].iov_base = ifa;
1128 iov[iovcnt++].iov_len = ifa->sin_len;
1129 rtm.rtm_msglen += ifa->sin_len;
1130 padlen = ROUNDUP(ifa->sin_len) - ifa->sin_len;
1131 if (padlen > 0) {
1132 iov[iovcnt].iov_base = &pad;
1133 iov[iovcnt++].iov_len = padlen;
1134 rtm.rtm_msglen += padlen;
1135 }
1136 }
1137
1138 memset(&rl, 0, sizeof(rl));
1139 rl.sr_len = sizeof(rl);
1140 rl.sr_family = AF_UNSPEC;
1141 (void)snprintf(rl.sr_label, sizeof(rl.sr_label), "%s",
1142 DHCPLEASED_RTA_LABEL);
1143 iov[iovcnt].iov_base = &rl;
1144 iov[iovcnt++].iov_len = sizeof(rl);
1145 rtm.rtm_msglen += sizeof(rl);
1146 padlen = ROUNDUP(sizeof(rl)) - sizeof(rl);
1147 if (padlen > 0) {
1148 iov[iovcnt].iov_base = &pad;
1149 iov[iovcnt++].iov_len = padlen;
1150 rtm.rtm_msglen += padlen;
1151 }
1152
1153 if (writev(routesock, iov, iovcnt) == -1) {
1154 if (errno != EEXIST)
1155 log_warn("failed to send route message");
1156 }
1157 }
1158
1159 #ifndef SMALL
1160 const char*
sin_to_str(struct sockaddr_in * sin)1161 sin_to_str(struct sockaddr_in *sin)
1162 {
1163 static char hbuf[NI_MAXHOST];
1164 int error;
1165
1166 error = getnameinfo((struct sockaddr *)sin, sin->sin_len, hbuf,
1167 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV);
1168 if (error) {
1169 log_warnx("%s", gai_strerror(error));
1170 strlcpy(hbuf, "unknown", sizeof(hbuf));
1171 }
1172 return hbuf;
1173 }
1174 #endif /* SMALL */
1175
1176 void
open_bpfsock(uint32_t if_index)1177 open_bpfsock(uint32_t if_index)
1178 {
1179 int bpfsock;
1180 char ifname[IF_NAMESIZE];
1181
1182 if (if_indextoname(if_index, ifname) == NULL) {
1183 log_warnx("%s: cannot find interface %d", __func__, if_index);
1184 return;
1185 }
1186
1187 if ((bpfsock = get_bpf_sock(ifname)) == -1)
1188 return;
1189
1190 main_imsg_compose_frontend(IMSG_BPFSOCK, bpfsock, &if_index,
1191 sizeof(if_index));
1192 }
1193
1194 void
propose_rdns(struct imsg_propose_rdns * rdns)1195 propose_rdns(struct imsg_propose_rdns *rdns)
1196 {
1197 struct rt_msghdr rtm;
1198 struct sockaddr_rtdns rtdns;
1199 struct iovec iov[3];
1200 long pad = 0;
1201 int iovcnt = 0, padlen;
1202
1203 memset(&rtm, 0, sizeof(rtm));
1204
1205 rtm.rtm_version = RTM_VERSION;
1206 rtm.rtm_type = RTM_PROPOSAL;
1207 rtm.rtm_msglen = sizeof(rtm);
1208 rtm.rtm_tableid = rdns->rdomain;
1209 rtm.rtm_index = rdns->if_index;
1210 rtm.rtm_seq = ++rtm_seq;
1211 rtm.rtm_priority = RTP_PROPOSAL_DHCLIENT;
1212 rtm.rtm_addrs = RTA_DNS;
1213 rtm.rtm_flags = RTF_UP;
1214
1215 iov[iovcnt].iov_base = &rtm;
1216 iov[iovcnt++].iov_len = sizeof(rtm);
1217
1218 memset(&rtdns, 0, sizeof(rtdns));
1219 rtdns.sr_family = AF_INET;
1220 rtdns.sr_len = 2 + rdns->rdns_count * sizeof(struct in_addr);
1221 memcpy(rtdns.sr_dns, rdns->rdns, rtdns.sr_len - 2);
1222
1223 iov[iovcnt].iov_base = &rtdns;
1224 iov[iovcnt++].iov_len = sizeof(rtdns);
1225 rtm.rtm_msglen += sizeof(rtdns);
1226 padlen = ROUNDUP(sizeof(rtdns)) - sizeof(rtdns);
1227 if (padlen > 0) {
1228 iov[iovcnt].iov_base = &pad;
1229 iov[iovcnt++].iov_len = padlen;
1230 rtm.rtm_msglen += padlen;
1231 }
1232
1233 if (writev(routesock, iov, iovcnt) == -1)
1234 log_warn("failed to propose nameservers");
1235 }
1236
1237 void
read_lease_file(struct imsg_ifinfo * imsg_ifinfo)1238 read_lease_file(struct imsg_ifinfo *imsg_ifinfo)
1239 {
1240 int len, fd;
1241 char if_name[IF_NAMESIZE];
1242 char lease_file_buf[sizeof(_PATH_LEASE) + IF_NAMESIZE];
1243
1244 if (no_lease_files)
1245 return;
1246
1247 memset(imsg_ifinfo->lease, 0, sizeof(imsg_ifinfo->lease));
1248
1249 if (if_indextoname(imsg_ifinfo->if_index, if_name) == NULL) {
1250 log_warnx("%s: cannot find interface %d", __func__,
1251 imsg_ifinfo->if_index);
1252 return;
1253 }
1254
1255 len = snprintf(lease_file_buf, sizeof(lease_file_buf), "%s%s",
1256 _PATH_LEASE, if_name);
1257 if ( len == -1 || (size_t) len >= sizeof(lease_file_buf)) {
1258 log_warnx("%s: failed to encode lease path for %s", __func__,
1259 if_name);
1260 return;
1261 }
1262
1263 if ((fd = open(lease_file_buf, O_RDONLY)) == -1)
1264 return;
1265
1266 /* no need for error handling, we'll just do a DHCP discover */
1267 read(fd, imsg_ifinfo->lease, sizeof(imsg_ifinfo->lease) - 1);
1268 close(fd);
1269 }
1270
1271 #ifndef SMALL
1272 void
merge_config(struct dhcpleased_conf * conf,struct dhcpleased_conf * xconf)1273 merge_config(struct dhcpleased_conf *conf, struct dhcpleased_conf *xconf)
1274 {
1275 struct iface_conf *iface_conf;
1276
1277 /* Remove & discard existing interfaces. */
1278 while ((iface_conf = SIMPLEQ_FIRST(&conf->iface_list)) != NULL) {
1279 SIMPLEQ_REMOVE_HEAD(&conf->iface_list, entry);
1280 free(iface_conf->vc_id);
1281 free(iface_conf->c_id);
1282 free(iface_conf->h_name);
1283 free(iface_conf);
1284 }
1285
1286 /* Add new interfaces. */
1287 SIMPLEQ_CONCAT(&conf->iface_list, &xconf->iface_list);
1288
1289 free(xconf);
1290 }
1291
1292 struct dhcpleased_conf *
config_new_empty(void)1293 config_new_empty(void)
1294 {
1295 struct dhcpleased_conf *xconf;
1296
1297 xconf = calloc(1, sizeof(*xconf));
1298 if (xconf == NULL)
1299 fatal(NULL);
1300
1301 SIMPLEQ_INIT(&xconf->iface_list);
1302
1303 return (xconf);
1304 }
1305
1306 void
config_clear(struct dhcpleased_conf * conf)1307 config_clear(struct dhcpleased_conf *conf)
1308 {
1309 struct dhcpleased_conf *xconf;
1310
1311 /* Merge current config with an empty config. */
1312 xconf = config_new_empty();
1313 merge_config(conf, xconf);
1314
1315 free(conf);
1316 }
1317
1318 #define I2S(x) case x: return #x
1319
1320 const char*
i2s(uint32_t type)1321 i2s(uint32_t type)
1322 {
1323 static char unknown[sizeof("IMSG_4294967295")];
1324
1325 switch (type) {
1326 I2S(IMSG_NONE);
1327 I2S(IMSG_CTL_LOG_VERBOSE);
1328 I2S(IMSG_CTL_SHOW_INTERFACE_INFO);
1329 I2S(IMSG_CTL_SEND_REQUEST);
1330 I2S(IMSG_CTL_RELOAD);
1331 I2S(IMSG_CTL_END);
1332 I2S(IMSG_RECONF_CONF);
1333 I2S(IMSG_RECONF_IFACE);
1334 I2S(IMSG_RECONF_VC_ID);
1335 I2S(IMSG_RECONF_C_ID);
1336 I2S(IMSG_RECONF_H_NAME);
1337 I2S(IMSG_RECONF_END);
1338 I2S(IMSG_SEND_DISCOVER);
1339 I2S(IMSG_SEND_REQUEST);
1340 I2S(IMSG_SOCKET_IPC);
1341 I2S(IMSG_OPEN_BPFSOCK);
1342 I2S(IMSG_BPFSOCK);
1343 I2S(IMSG_UDPSOCK);
1344 I2S(IMSG_CLOSE_UDPSOCK);
1345 I2S(IMSG_ROUTESOCK);
1346 I2S(IMSG_CONTROLFD);
1347 I2S(IMSG_STARTUP);
1348 I2S(IMSG_UPDATE_IF);
1349 I2S(IMSG_REMOVE_IF);
1350 I2S(IMSG_DHCP);
1351 I2S(IMSG_CONFIGURE_INTERFACE);
1352 I2S(IMSG_DECONFIGURE_INTERFACE);
1353 I2S(IMSG_PROPOSE_RDNS);
1354 I2S(IMSG_WITHDRAW_RDNS);
1355 I2S(IMSG_WITHDRAW_ROUTES);
1356 I2S(IMSG_REPROPOSE_RDNS);
1357 I2S(IMSG_REQUEST_REBOOT);
1358 default:
1359 snprintf(unknown, sizeof(unknown), "IMSG_%u", type);
1360 return unknown;
1361 }
1362 }
1363 #undef I2S
1364
1365 #endif /* SMALL */
1366