1 /*
2  * Copyright (c) 2020, 2021, 2022 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "gmid.h"
18 
19 #include <sys/stat.h>
20 
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <getopt.h>
24 #include <libgen.h>
25 #include <limits.h>
26 #include <pwd.h>
27 #include <signal.h>
28 #include <string.h>
29 
30 static const char	*opts = "6c:D:d:fH:hnP:p:Vvx:";
31 
32 static const struct option longopts[] = {
33 	{"help",	no_argument,		NULL,	'h'},
34 	{"version",	no_argument,		NULL,	'V'},
35 	{NULL,		0,			NULL,	0},
36 };
37 
38 struct fcgi fcgi[FCGI_MAX];
39 
40 struct vhosthead hosts;
41 
42 int sock4, sock6;
43 
44 struct imsgbuf logibuf, exibuf, servibuf[PROC_MAX];
45 
46 const char *config_path, *certs_dir, *hostname, *pidfile, *cgi;
47 
48 struct conf conf;
49 
50 struct tls_config *tlsconf;
51 struct tls *ctx;
52 
53 static void
54 dummy_handler(int signo)
55 {
56 	return;
57 }
58 
59 /* wrapper around dirname(3).  dn must be PATH_MAX+1 at least. */
60 static void
61 pdirname(const char *path, char *dn)
62 {
63 	char	 p[PATH_MAX+1];
64 	char	*t;
65 
66 	strlcpy(p, path, sizeof(p));
67 	t = dirname(p);
68 	memmove(dn, t, strlen(t)+1);
69 }
70 
71 static void
72 mkdirs(const char *path, mode_t mode)
73 {
74 	char	dname[PATH_MAX+1];
75 
76 	pdirname(path, dname);
77 	if (!strcmp(dname, "/"))
78 		return;
79 	mkdirs(dname, mode);
80 	if (mkdir(path, mode) != 0 && errno != EEXIST)
81 		fatal("can't mkdir %s: %s", path, strerror(errno));
82 }
83 
84 /* $XDG_DATA_HOME/gmid */
85 char *
86 data_dir(void)
87 {
88 	const char *home, *xdg;
89 	char *t;
90 
91 	if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
92 		if ((home = getenv("HOME")) == NULL)
93 			errx(1, "XDG_DATA_HOME and HOME both empty");
94 		if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
95 			err(1, "asprintf");
96 	} else {
97 		if (asprintf(&t, "%s/gmid", xdg) == -1)
98 			err(1, "asprintf");
99 	}
100 
101 	mkdirs(t, 0755);
102 	return t;
103 }
104 
105 void
106 load_local_cert(const char *hostname, const char *dir)
107 {
108 	char *cert, *key;
109 	struct vhost *h;
110 
111 	if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
112 		errx(1, "asprintf");
113 	if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
114 		errx(1, "asprintf");
115 
116 	if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
117 		gen_certificate(hostname, cert, key);
118 
119 	h = TAILQ_FIRST(&hosts);
120 	h->cert = cert;
121 	h->key = key;
122 	h->domain = hostname;
123 }
124 
125 void
126 load_vhosts(void)
127 {
128 	struct vhost	*h;
129 	struct location	*l;
130 
131 	TAILQ_FOREACH(h, &hosts, vhosts) {
132 		TAILQ_FOREACH(l, &h->locations, locations) {
133 			if (l->dir == NULL)
134 				continue;
135 			if ((l->dirfd = open(l->dir, O_RDONLY | O_DIRECTORY)) == -1)
136 				fatal("open %s for domain %s: %s", l->dir, h->domain,
137 				    strerror(errno));
138 		}
139 	}
140 }
141 
142 int
143 make_socket(int port, int family)
144 {
145 	int sock, v;
146 	struct sockaddr_in addr4;
147 	struct sockaddr_in6 addr6;
148 	struct sockaddr *addr;
149 	socklen_t len;
150 
151 	switch (family) {
152 	case AF_INET:
153 		memset(&addr4, 0, sizeof(addr4));
154 		addr4.sin_family = family;
155 		addr4.sin_port = htons(port);
156 		addr4.sin_addr.s_addr = INADDR_ANY;
157 		addr = (struct sockaddr*)&addr4;
158 		len = sizeof(addr4);
159 		break;
160 
161 	case AF_INET6:
162 		memset(&addr6, 0, sizeof(addr6));
163 		addr6.sin6_family = AF_INET6;
164 		addr6.sin6_port = htons(port);
165 		addr6.sin6_addr = in6addr_any;
166 		addr = (struct sockaddr*)&addr6;
167 		len = sizeof(addr6);
168 		break;
169 
170 	default:
171 		/* unreachable */
172 		abort();
173 	}
174 
175 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
176 		fatal("socket: %s", strerror(errno));
177 
178 	v = 1;
179 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
180 		fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
181 
182 	v = 1;
183 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
184 		fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
185 
186 	mark_nonblock(sock);
187 
188 	if (bind(sock, addr, len) == -1)
189 		fatal("bind: %s", strerror(errno));
190 
191 	if (listen(sock, 16) == -1)
192 		fatal("listen: %s", strerror(errno));
193 
194 	return sock;
195 }
196 
197 static void
198 add_keypair(struct vhost *h)
199 {
200 	if (h->ocsp == NULL) {
201 		if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
202 			fatal("failed to load the keypair (%s, %s)",
203 			    h->cert, h->key);
204 	} else {
205 		if (tls_config_add_keypair_ocsp_file(tlsconf, h->cert, h->key,
206 		    h->ocsp) == -1)
207 			fatal("failed to load the keypair (%s, %s, %s)",
208 			    h->cert, h->key, h->ocsp);
209 	}
210 }
211 
212 void
213 setup_tls(void)
214 {
215 	struct vhost *h;
216 
217 	if ((tlsconf = tls_config_new()) == NULL)
218 		fatal("tls_config_new");
219 
220 	/* optionally accept client certs, but don't try to verify them */
221 	tls_config_verify_client_optional(tlsconf);
222 	tls_config_insecure_noverifycert(tlsconf);
223 
224 	if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
225 		fatal("tls_config_set_protocols");
226 
227 	if ((ctx = tls_server()) == NULL)
228 		fatal("tls_server failure");
229 
230 	h = TAILQ_FIRST(&hosts);
231 
232 	/* we need to set something, then we can add how many key we want */
233 	if (tls_config_set_keypair_file(tlsconf, h->cert, h->key))
234 		fatal("tls_config_set_keypair_file failed for (%s, %s)",
235 		    h->cert, h->key);
236 
237 	/* same for OCSP */
238 	if (h->ocsp != NULL &&
239 	    tls_config_set_ocsp_staple_file(tlsconf, h->ocsp) == -1)
240 		fatal("tls_config_set_ocsp_staple_file failed for (%s)",
241 		    h->ocsp);
242 
243 	while ((h = TAILQ_NEXT(h, vhosts)) != NULL)
244 		add_keypair(h);
245 
246 	if (tls_configure(ctx, tlsconf) == -1)
247 		fatal("tls_configure: %s", tls_error(ctx));
248 }
249 
250 static int
251 listener_main(struct imsgbuf *ibuf)
252 {
253 	drop_priv();
254 	if (!conf.mime.skip_defaults && load_default_mime(&conf.mime) == -1)
255 		fatal("load_default_mime: %s", strerror(errno));
256 	sort_mime(&conf.mime);
257 	load_vhosts();
258 	loop(ctx, sock4, sock6, ibuf);
259 	return 0;
260 }
261 
262 void
263 init_config(void)
264 {
265 	TAILQ_INIT(&hosts);
266 
267 	conf.port = 1965;
268 	conf.ipv6 = 0;
269 	conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
270 
271 	init_mime(&conf.mime);
272 
273 	conf.chroot = NULL;
274 	conf.user = NULL;
275 
276 	conf.prefork = 3;
277 }
278 
279 void
280 free_config(void)
281 {
282 	struct vhost *h, *th;
283 	struct location *l, *tl;
284 	struct proxy *p, *tp;
285 	struct envlist *e, *te;
286 	struct alist *a, *ta;
287 	int v, i;
288 
289 	v = conf.verbose;
290 
291 	free_mime(&conf.mime);
292 	free(conf.chroot);
293 	free(conf.user);
294 	memset(&conf, 0, sizeof(conf));
295 
296 	conf.verbose = v;
297 
298 	TAILQ_FOREACH_SAFE(h, &hosts, vhosts, th) {
299 		TAILQ_FOREACH_SAFE(l, &h->locations, locations, tl) {
300 			TAILQ_REMOVE(&h->locations, l, locations);
301 
302 			free((char*)l->match);
303 			free((char*)l->lang);
304 			free((char*)l->default_mime);
305 			free((char*)l->index);
306 			free((char*)l->block_fmt);
307 			free((char*)l->dir);
308 
309 			if (l->dirfd != -1)
310 				close(l->dirfd);
311 
312 			free(l);
313 		}
314 
315 		TAILQ_FOREACH_SAFE(e, &h->env, envs, te) {
316 			TAILQ_REMOVE(&h->env, e, envs);
317 
318 			free(e->name);
319 			free(e->value);
320 			free(e);
321 		}
322 
323 		TAILQ_FOREACH_SAFE(e, &h->params, envs, te) {
324 			TAILQ_REMOVE(&h->params, e, envs);
325 
326 			free(e->name);
327 			free(e->value);
328 			free(e);
329 		}
330 
331 		TAILQ_FOREACH_SAFE(a, &h->aliases, aliases, ta) {
332 			TAILQ_REMOVE(&h->aliases, a, aliases);
333 
334 			free(a->alias);
335 			free(a);
336 		}
337 
338 		TAILQ_FOREACH_SAFE(p, &h->proxies, proxies, tp) {
339 			TAILQ_REMOVE(&h->proxies, p, proxies);
340 
341 			free(p->match_proto);
342 			free(p->match_host);
343 			free(p->host);
344 			free(p->sni);
345 			tls_unload_file(p->cert, p->certlen);
346 			tls_unload_file(p->key, p->keylen);
347 			free(p);
348 		}
349 
350 		free((char*)h->domain);
351 		free((char*)h->cert);
352 		free((char*)h->key);
353 		free((char*)h->ocsp);
354 		free((char*)h->cgi);
355 		free((char*)h->entrypoint);
356 
357 		TAILQ_REMOVE(&hosts, h, vhosts);
358 		free(h);
359 	}
360 
361 	for (i = 0; i < FCGI_MAX; ++i) {
362 		if (fcgi[i].path == NULL && fcgi[i].prog == NULL)
363 			break;
364 		free(fcgi[i].path);
365 		free(fcgi[i].port);
366 		free(fcgi[i].prog);
367 
368 		fcgi[i].path = NULL;
369 		fcgi[i].port = NULL;
370 		fcgi[i].prog = NULL;
371 	}
372 
373 	tls_free(ctx);
374 	tls_config_free(tlsconf);
375 }
376 
377 static int
378 wait_signal(void)
379 {
380 	sigset_t mask;
381 	int signo;
382 
383 	sigemptyset(&mask);
384 	sigaddset(&mask, SIGHUP);
385 	sigaddset(&mask, SIGINT);
386 	sigaddset(&mask, SIGTERM);
387 	sigwait(&mask, &signo);
388 
389 	return signo == SIGHUP;
390 }
391 
392 void
393 drop_priv(void)
394 {
395 	struct passwd *pw = NULL;
396 
397 	if (conf.chroot != NULL && conf.user == NULL)
398 		fatal("can't chroot without an user to switch to after.");
399 
400 	if (conf.user != NULL) {
401 		if ((pw = getpwnam(conf.user)) == NULL)
402 			fatal("can't find user %s", conf.user);
403 	}
404 
405 	if (conf.chroot != NULL) {
406 		if (chroot(conf.chroot) != 0 || chdir("/") != 0)
407 			fatal("%s: %s", conf.chroot, strerror(errno));
408 	}
409 
410 	if (pw != NULL) {
411 		if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
412 			fatal("setresuid(%d): %s", pw->pw_uid,
413 			    strerror(errno));
414 	}
415 
416 	if (getuid() == 0)
417 		log_warn(NULL, "not a good idea to run a network daemon as root");
418 }
419 
420 static void
421 usage(void)
422 {
423 	fprintf(stderr,
424 	    "Version: " GMID_STRING "\n"
425 	    "Usage: %s [-fnv] [-c config] [-D macro=value] [-P pidfile]\n"
426 	    "       %s [-6hVv] [-d certs-dir] [-H hostname] [-p port] [-x cgi] [dir]\n",
427 	    getprogname(),
428 	    getprogname());
429 }
430 
431 static void
432 logger_init(void)
433 {
434 	int p[2];
435 
436 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
437 		err(1, "socketpair");
438 
439 	switch (fork()) {
440 	case -1:
441 		err(1, "fork");
442 	case 0:
443 		signal(SIGHUP, SIG_IGN);
444 		close(p[0]);
445 		setproctitle("logger");
446 		imsg_init(&logibuf, p[1]);
447 		drop_priv();
448 		_exit(logger_main(p[1], &logibuf));
449 	default:
450 		close(p[1]);
451 		imsg_init(&logibuf, p[0]);
452 		return;
453 	}
454 }
455 
456 static int
457 serve(int argc, char **argv, struct imsgbuf *ibuf)
458 {
459 	char		 path[PATH_MAX];
460 	int		 i, p[2];
461 	struct vhost	*h;
462 	struct location	*l;
463 
464 	if (config_path == NULL) {
465 		if (hostname == NULL)
466 			hostname = "localhost";
467 		if (certs_dir == NULL)
468 			certs_dir = data_dir();
469 		load_local_cert(hostname, certs_dir);
470 
471 		h = TAILQ_FIRST(&hosts);
472 		h->domain = "*";
473 
474 		l = TAILQ_FIRST(&h->locations);
475 		l->auto_index = 1;
476 		l->match = "*";
477 
478 		switch (argc) {
479 		case 0:
480 			l->dir = getcwd(path, sizeof(path));
481 			break;
482 		case 1:
483 			l->dir = absolutify_path(argv[0]);
484 			break;
485 		default:
486 			usage();
487 			return 1;
488 		}
489 
490 		log_notice(NULL, "serving %s on port %d", l->dir, conf.port);
491 	}
492 
493 	/* setup tls before dropping privileges: we don't want user
494 	 * to put private certs inside the chroot. */
495 	setup_tls();
496 
497 	for (i = 0; i < conf.prefork; ++i) {
498 		if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
499 		    PF_UNSPEC, p) == -1)
500 			fatal("socketpair: %s", strerror(errno));
501 
502 		switch (fork()) {
503 		case -1:
504 			fatal("fork: %s", strerror(errno));
505 		case 0:		/* child */
506 			close(p[0]);
507 			imsg_init(&exibuf, p[1]);
508 			setproctitle("server");
509 			_exit(listener_main(&exibuf));
510 		default:
511 			close(p[1]);
512 			imsg_init(&servibuf[i], p[0]);
513 		}
514 	}
515 
516 	setproctitle("executor");
517 	drop_priv();
518 	_exit(executor_main(ibuf));
519 }
520 
521 static int
522 write_pidfile(const char *pidfile)
523 {
524 	struct flock	lock;
525 	int		fd;
526 
527 	if (pidfile == NULL)
528 		return -1;
529 
530 	if ((fd = open(pidfile, O_WRONLY|O_CREAT|O_CLOEXEC, 0600)) == -1)
531 		fatal("can't open pidfile %s: %s", pidfile, strerror(errno));
532 
533 	lock.l_start = 0;
534 	lock.l_len = 0;
535 	lock.l_type = F_WRLCK;
536 	lock.l_whence = SEEK_SET;
537 
538 	if (fcntl(fd, F_SETLK, &lock) == -1)
539 		fatal("can't lock %s, gmid is already running?", pidfile);
540 
541 	if (ftruncate(fd, 0) == -1)
542 		fatal("ftruncate: %s: %s", pidfile, strerror(errno));
543 
544 	dprintf(fd, "%d\n", getpid());
545 
546 	return fd;
547 }
548 
549 static void
550 setup_configless(int argc, char **argv, const char *cgi)
551 {
552 	struct vhost	*host;
553 	struct location	*loc;
554 
555 	host = xcalloc(1, sizeof(*host));
556 	host->cgi = cgi;
557 	TAILQ_INSERT_HEAD(&hosts, host, vhosts);
558 
559 	loc = xcalloc(1, sizeof(*loc));
560 	loc->fcgi = -1;
561 	TAILQ_INSERT_HEAD(&host->locations, loc, locations);
562 
563 	serve(argc, argv, NULL);
564 
565 	imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
566 	imsg_flush(&logibuf);
567 }
568 
569 static int
570 parse_portno(const char *p)
571 {
572 	const char *errstr;
573 	int n;
574 
575 	n = strtonum(p, 0, UINT16_MAX, &errstr);
576 	if (errstr != NULL)
577 		yyerror("port number is %s: %s", errstr, p);
578 	return n;
579 }
580 
581 int
582 main(int argc, char **argv)
583 {
584 	struct imsgbuf exibuf;
585 	int ch, conftest = 0, configless = 0;
586 	int pidfd, old_ipv6, old_port;
587 
588 	logger_init();
589 	init_config();
590 
591 	while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
592 		switch (ch) {
593 		case '6':
594 			conf.ipv6 = 1;
595 			configless = 1;
596 			break;
597 
598 		case 'c':
599 			config_path = absolutify_path(optarg);
600 			break;
601 
602 		case 'D':
603 			if (cmdline_symset(optarg) == -1)
604 				fatal("could not parse macro definition: %s",
605 				    optarg);
606 			break;
607 
608 		case 'd':
609 			certs_dir = optarg;
610 			configless = 1;
611 			break;
612 
613 		case 'f':
614 			conf.foreground = 1;
615 			break;
616 
617 		case 'H':
618 			hostname = optarg;
619 			configless = 1;
620 			break;
621 
622 		case 'h':
623 			usage();
624 			return 0;
625 
626 		case 'n':
627 			conftest++;
628 			break;
629 
630 		case 'P':
631 			pidfile = optarg;
632 			break;
633 
634 		case 'p':
635 			conf.port = parse_portno(optarg);
636 			configless = 1;
637 			break;
638 
639 		case 'V':
640 			puts("Version: " GMID_STRING);
641 			return 0;
642 
643 		case 'v':
644 			conf.verbose++;
645 			break;
646 
647 		case 'x':
648 			/* drop the starting / (if any) */
649 			if (*optarg == '/')
650 				optarg++;
651 			cgi = optarg;
652 			configless = 1;
653 			break;
654 
655 		default:
656 			usage();
657 			return 1;
658 		}
659 	}
660 	argc -= optind;
661 	argv += optind;
662 
663 	if (config_path == NULL) {
664 		configless = 1;
665 		conf.foreground = 1;
666 		conf.prefork = 1;
667 		conf.verbose++;
668 	}
669 
670 	if (config_path != NULL && (argc > 0 || configless))
671 		fatal("can't specify options in config mode.");
672 
673 	if (conftest) {
674 		if (config_path == NULL)
675 			fatal("missing configuration");
676 		parse_conf(config_path);
677 		fprintf(stderr, "config OK\n");
678 		if (conftest > 1)
679 			print_conf();
680 		return 0;
681 	}
682 
683 	if (!conf.foreground && !configless) {
684 		/* log to syslog */
685 		imsg_compose(&logibuf, IMSG_LOG_TYPE, 0, 0, -1, NULL, 0);
686 		imsg_flush(&logibuf);
687 
688 		if (daemon(1, 1) == -1)
689 			fatal("daemon: %s", strerror(errno));
690 	}
691 
692 	if (config_path != NULL)
693 		parse_conf(config_path);
694 
695 	sock4 = make_socket(conf.port, AF_INET);
696 	sock6 = -1;
697 	if (conf.ipv6)
698 		sock6 = make_socket(conf.port, AF_INET6);
699 
700 	signal(SIGPIPE, SIG_IGN);
701 	signal(SIGCHLD, SIG_IGN);
702 
703 	if (configless) {
704 		setup_configless(argc, argv, cgi);
705 		return 0;
706 	}
707 
708 	pidfd = write_pidfile(pidfile);
709 
710 	/*
711 	 * Linux seems to call the event handlers even when we're
712 	 * doing a sigwait.  These dummy handlers are here to avoid
713 	 * being terminated on SIGHUP, SIGINT or SIGTERM.
714 	 */
715 	signal(SIGHUP, dummy_handler);
716 	signal(SIGINT, dummy_handler);
717 	signal(SIGTERM, dummy_handler);
718 
719 	/* wait a sighup and reload the daemon */
720 	for (;;) {
721 		int p[2];
722 
723 		if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
724 		    PF_UNSPEC, p) == -1)
725 			fatal("socketpair: %s", strerror(errno));
726 
727 		switch (fork()) {
728 		case -1:
729 			fatal("fork: %s", strerror(errno));
730 		case 0:
731 			close(p[0]);
732 			imsg_init(&exibuf, p[1]);
733 			_exit(serve(argc, argv, &exibuf));
734 		}
735 
736 		close(p[1]);
737 		imsg_init(&exibuf, p[0]);
738 
739 		if (!wait_signal())
740 			break;
741 
742 		log_info(NULL, "reloading configuration %s", config_path);
743 
744 		/* close the executor (it'll close the servers too) */
745 		imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
746 		imsg_flush(&exibuf);
747 		close(p[0]);
748 
749 		old_ipv6 = conf.ipv6;
750 		old_port = conf.port;
751 
752 		free_config();
753 		init_config();
754 		parse_conf(config_path);
755 
756 		if (old_port != conf.port) {
757 			close(sock4);
758 			close(sock6);
759 			sock4 = -1;
760 			sock6 = -1;
761 		}
762 
763 		if (sock6 != -1 && old_ipv6 != conf.ipv6) {
764 			close(sock6);
765 			sock6 = -1;
766 		}
767 
768 		if (sock4 == -1)
769 			sock4 = make_socket(conf.port, AF_INET);
770 		if (sock6 == -1 && conf.ipv6)
771 			sock6 = make_socket(conf.port, AF_INET6);
772 	}
773 
774 	imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
775 	imsg_flush(&exibuf);
776 
777 	imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
778 	imsg_flush(&logibuf);
779 
780 	if (pidfd != -1)
781 		close(pidfd);
782 
783 	return 0;
784 }