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Date:: Sun Jan 17 09:34:06 2021 UTC
Message:: missing break
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1 /*
2  * Copyright (c) 2020 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 <sys/mman.h>
18 #include <sys/stat.h>
19 
20 #include <assert.h>
21 #include <err.h>
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <limits.h>
25 #include <netdb.h>
26 #include <signal.h>
27 #include <stdarg.h>
28 #include <string.h>
29 
30 #include "gmid.h"
31 
32 struct vhost hosts[HOSTSLEN];
33 
34 int connected_clients;
35 int goterror;
36 
37 int exfd;
38 
39 struct conf conf;
40 
41 struct etm {			/* file extension to mime */
42 	const char	*mime;
43 	const char	*ext;
44 } filetypes[] = {
45 	{"application/pdf",	"pdf"},
46 
47 	{"image/gif",		"gif"},
48 	{"image/jpeg",		"jpg"},
49 	{"image/jpeg",		"jpeg"},
50 	{"image/png",		"png"},
51 	{"image/svg+xml",	"svg"},
52 
53 	{"text/gemini",		"gemini"},
54 	{"text/gemini",		"gmi"},
55 	{"text/markdown",	"markdown"},
56 	{"text/markdown",	"md"},
57 	{"text/plain",		"txt"},
58 	{"text/xml",		"xml"},
59 
60 	{NULL, NULL}
61 };
62 
63 __attribute__ ((format (printf, 1, 2)))
64 __attribute__ ((__noreturn__))
65 static inline void
66 fatal(const char *fmt, ...)
67 {
68 	va_list ap;
69 
70 	va_start(ap, fmt);
71 
72 	if (conf.foreground) {
73 		vfprintf(stderr, fmt, ap);
74 		fprintf(stderr, "\n");
75 	} else
76 		vsyslog(LOG_DAEMON | LOG_CRIT, fmt, ap);
77 
78 	va_end(ap);
79 	exit(1);
80 }
81 
82 void
83 logs(int priority, struct client *c,
84     const char *fmt, ...)
85 {
86 	char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
87 	char *fmted, *s;
88 	size_t len;
89 	int ec;
90 	va_list ap;
91 
92 	va_start(ap, fmt);
93 
94 	if (c == NULL) {
95 		strncpy(hbuf, "<internal>", sizeof(hbuf));
96 		sbuf[0] = '\0';
97 	} else {
98 		len = sizeof(c->addr);
99 		ec = getnameinfo((struct sockaddr*)&c->addr, len,
100 		    hbuf, sizeof(hbuf),
101 		    sbuf, sizeof(sbuf),
102 		    NI_NUMERICHOST | NI_NUMERICSERV);
103 		if (ec != 0)
104 			fatal("getnameinfo: %s", gai_strerror(ec));
105 	}
106 
107 	if (vasprintf(&fmted, fmt, ap) == -1)
108 		fatal("vasprintf: %s", strerror(errno));
109 
110 	if (conf.foreground)
111 		fprintf(stderr, "%s:%s %s\n", hbuf, sbuf, fmted);
112 	else {
113 		if (asprintf(&s, "%s:%s %s", hbuf, sbuf, fmted) == -1)
114 			fatal("asprintf: %s", strerror(errno));
115 		syslog(priority | LOG_DAEMON, "%s", s);
116 		free(s);
117 	}
118 
119 	free(fmted);
120 
121 	va_end(ap);
122 }
123 
124 void
125 sig_handler(int sig)
126 {
127 	(void)sig;
128 }
129 
130 int
131 starts_with(const char *str, const char *prefix)
132 {
133 	size_t i;
134 
135 	for (i = 0; prefix[i] != '\0'; ++i)
136 		if (str[i] != prefix[i])
137 			return 0;
138 	return 1;
139 }
140 
141 int
142 start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
143 {
144 	char buf[1030]; 	/* status + ' ' + max reply len + \r\n\0 */
145 	int len;
146 
147 	client->code = code;
148 	client->meta = reason;
149 	client->state = S_INITIALIZING;
150 
151 	len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
152 	assert(len < (int)sizeof(buf));
153 
154 	switch (tls_write(client->ctx, buf, len)) {
155 	case TLS_WANT_POLLIN:
156 		pfd->events = POLLIN;
157 		return 0;
158 	case TLS_WANT_POLLOUT:
159 		pfd->events = POLLOUT;
160 		return 0;
161 	default:
162 		return 1;
163 	}
164 }
165 
166 ssize_t
167 filesize(int fd)
168 {
169 	ssize_t len;
170 
171 	if ((len = lseek(fd, 0, SEEK_END)) == -1)
172 		return -1;
173 	if (lseek(fd, 0, SEEK_SET) == -1)
174 		return -1;
175 	return len;
176 }
177 
178 const char *
179 path_ext(const char *path)
180 {
181 	const char *end;
182 
183 	end = path + strlen(path)-1;
184 	for (; end != path; --end) {
185 		if (*end == '.')
186 			return end+1;
187 		if (*end == '/')
188 			break;
189 	}
190 
191 	return NULL;
192 }
193 
194 const char *
195 mime(const char *path)
196 {
197 	const char *ext, *def = "application/octet-stream";
198 	struct etm *t;
199 
200 	if ((ext = path_ext(path)) == NULL)
201 		return def;
202 
203 	for (t = filetypes; t->mime != NULL; ++t)
204 		if (!strcmp(ext, t->ext))
205 			return t->mime;
206 
207 	return def;
208 }
209 
210 int
211 check_path(struct client *c, const char *path, int *fd)
212 {
213 	struct stat sb;
214 
215 	assert(path != NULL);
216 	if ((*fd = openat(c->host->dirfd, *path ? path : ".",
217 	    O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
218 		return FILE_MISSING;
219 	}
220 
221 	if (fstat(*fd, &sb) == -1) {
222 		LOGN(c, "failed stat for %s: %s", path, strerror(errno));
223 		return FILE_MISSING;
224 	}
225 
226 	if (S_ISDIR(sb.st_mode))
227 		return FILE_DIRECTORY;
228 
229 	if (sb.st_mode & S_IXUSR)
230 		return FILE_EXECUTABLE;
231 
232 	return FILE_EXISTS;
233 }
234 
235 int
236 open_file(char *fpath, char *query, struct pollfd *fds, struct client *c)
237 {
238 	switch (check_path(c, fpath, &c->fd)) {
239 	case FILE_EXECUTABLE:
240 		if (c->host->cgi != NULL && starts_with(fpath, c->host->cgi))
241 			return start_cgi(fpath, "", query, fds, c);
242 
243 		/* fallthrough */
244 
245 	case FILE_EXISTS:
246 		if ((c->len = filesize(c->fd)) == -1) {
247 			LOGE(c, "failed to get file size for %s", fpath);
248 			goodbye(fds, c);
249 			return 0;
250 		}
251 
252 		if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
253 			    c->fd, 0)) == MAP_FAILED) {
254 			warn("mmap: %s", fpath);
255 			goodbye(fds, c);
256 			return 0;
257 		}
258 		c->i = c->buf;
259 		return start_reply(fds, c, SUCCESS, mime(fpath));
260 
261 	case FILE_DIRECTORY:
262 		LOGD(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
263 		close(c->fd);
264 		c->fd = -1;
265 		send_dir(fpath, fds, c);
266 		return 0;
267 
268 	case FILE_MISSING:
269 		if (c->host->cgi != NULL && starts_with(fpath, c->host->cgi))
270 			return check_for_cgi(fpath, query, fds, c);
271 
272 		if (!start_reply(fds, c, NOT_FOUND, "not found"))
273 			return 0;
274 		goodbye(fds, c);
275 		return 0;
276 
277 	default:
278 		/* unreachable */
279 		abort();
280 	}
281 }
282 
283 void
284 send_file(char *path, char *query, struct pollfd *fds, struct client *c)
285 {
286 	ssize_t ret, len;
287 
288 	if (c->fd == -1) {
289 		if (!open_file(path, query, fds, c))
290 			return;
291 		c->state = S_SENDING;
292 	}
293 
294 	len = (c->buf + c->len) - c->i;
295 
296 	while (len > 0) {
297 		switch (ret = tls_write(c->ctx, c->i, len)) {
298 		case -1:
299 			LOGE(c, "tls_write: %s", tls_error(c->ctx));
300 			goodbye(fds, c);
301 			return;
302 
303 		case TLS_WANT_POLLIN:
304 			fds->events = POLLIN;
305 			return;
306 
307 		case TLS_WANT_POLLOUT:
308 			fds->events = POLLOUT;
309 			return;
310 
311 		default:
312 			c->i += ret;
313 			len -= ret;
314 			break;
315 		}
316 	}
317 
318 	goodbye(fds, c);
319 }
320 
321 void
322 send_dir(char *path, struct pollfd *fds, struct client *client)
323 {
324 	char fpath[PATHBUF];
325 	size_t len;
326 
327 	bzero(fpath, PATHBUF);
328 
329 	if (path[0] != '.')
330 		fpath[0] = '.';
331 
332 	/* this cannot fail since sizeof(fpath) > maxlen of path */
333 	strlcat(fpath, path, PATHBUF);
334 	len = strlen(fpath);
335 
336 	/* add a trailing / in case. */
337 	if (fpath[len-1] != '/') {
338 		fpath[len] = '/';
339 	}
340 
341 	strlcat(fpath, "index.gmi", sizeof(fpath));
342 
343 	send_file(fpath, NULL, fds, client);
344 }
345 
346 void
347 handle_handshake(struct pollfd *fds, struct client *c)
348 {
349 	struct vhost *h;
350 	const char *servname;
351 
352 	switch (tls_handshake(c->ctx)) {
353 	case 0:  /* success */
354 	case -1: /* already handshaked */
355 		break;
356 	case TLS_WANT_POLLIN:
357 		fds->events = POLLIN;
358 		return;
359 	case TLS_WANT_POLLOUT:
360 		fds->events = POLLOUT;
361 		return;
362 	default:
363 		/* unreachable */
364 		abort();
365 	}
366 
367 	servname = tls_conn_servername(c->ctx);
368 	if (servname == NULL)
369 		goto hostnotfound;
370 
371 	for (h = hosts; h->domain != NULL; ++h) {
372 		if (!strcmp(h->domain, servname) || !strcmp(h->domain, "*"))
373 			break;
374 	}
375 
376 	if (h->domain != NULL) {
377 		c->state = S_OPEN;
378 		c->host = h;
379 		handle_open_conn(fds, c);
380 		return;
381 	}
382 
383 hostnotfound:
384 	/* XXX: check the correct response */
385 	if (!start_reply(fds, c, BAD_REQUEST, "Wrong host or missing SNI"))
386 		return;
387 	goodbye(fds, c);
388 }
389 
390 void
391 handle_open_conn(struct pollfd *fds, struct client *c)
392 {
393 	char buf[GEMINI_URL_LEN];
394 	const char *parse_err = "invalid request";
395 	struct iri iri;
396 
397 	bzero(buf, sizeof(buf));
398 
399 	switch (tls_read(c->ctx, buf, sizeof(buf)-1)) {
400 	case -1:
401 		LOGE(c, "tls_read: %s", tls_error(c->ctx));
402 		goodbye(fds, c);
403 		return;
404 
405 	case TLS_WANT_POLLIN:
406 		fds->events = POLLIN;
407 		return;
408 
409 	case TLS_WANT_POLLOUT:
410 		fds->events = POLLOUT;
411 		return;
412 	}
413 
414 	if (!trim_req_iri(buf) || !parse_iri(buf, &iri, &parse_err)) {
415 		if (!start_reply(fds, c, BAD_REQUEST, parse_err))
416 			return;
417 		goodbye(fds, c);
418 		return;
419 	}
420 
421 	if (strcmp(iri.schema, "gemini") || iri.port_no != conf.port) {
422 		if (!start_reply(fds, c, PROXY_REFUSED, "won't proxy request"))
423 			return;
424 		goodbye(fds, c);
425 		return;
426 	}
427 
428 	LOGI(c, "GET %s%s%s",
429 	    *iri.path ? iri.path : "/",
430 	    *iri.query ? "?" : "",
431 	    *iri.query ? iri.query : "");
432 
433 	send_file(iri.path, iri.query, fds, c);
434 }
435 
436 void
437 handle(struct pollfd *fds, struct client *client)
438 {
439 	switch (client->state) {
440 	case S_HANDSHAKE:
441 		handle_handshake(fds, client);
442 		break;
443 
444 	case S_OPEN:
445                 handle_open_conn(fds, client);
446 		break;
447 
448 	case S_INITIALIZING:
449 		if (!start_reply(fds, client, client->code, client->meta))
450 			return;
451 
452 		if (client->code != SUCCESS) {
453 			/* we don't need a body */
454 			goodbye(fds, client);
455 			return;
456 		}
457 
458 		client->state = S_SENDING;
459 
460 		/* fallthrough */
461 
462 	case S_SENDING:
463 		if (client->child)
464 			handle_cgi(fds, client);
465 		else
466 			send_file(NULL, NULL, fds, client);
467 		break;
468 
469 	case S_CLOSING:
470 		goodbye(fds, client);
471 		break;
472 
473 	default:
474 		/* unreachable */
475 		abort();
476 	}
477 }
478 
479 void
480 mark_nonblock(int fd)
481 {
482 	int flags;
483 
484 	if ((flags = fcntl(fd, F_GETFL)) == -1)
485 		fatal("fcntl(F_GETFL): %s", strerror(errno));
486 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
487 		fatal("fcntl(F_SETFL): %s", strerror(errno));
488 }
489 
490 int
491 make_socket(int port, int family)
492 {
493 	int sock, v;
494 	struct sockaddr_in addr4;
495 	struct sockaddr_in6 addr6;
496 	struct sockaddr *addr;
497 	socklen_t len;
498 
499         switch (family) {
500 	case AF_INET:
501 		bzero(&addr4, sizeof(addr4));
502 		addr4.sin_family = family;
503 		addr4.sin_port = htons(port);
504 		addr4.sin_addr.s_addr = INADDR_ANY;
505 		addr = (struct sockaddr*)&addr4;
506 		len = sizeof(addr4);
507 		break;
508 
509 	case AF_INET6:
510 		bzero(&addr6, sizeof(addr6));
511 		addr6.sin6_family = AF_INET6;
512 		addr6.sin6_port = htons(port);
513 		addr6.sin6_addr = in6addr_any;
514 		addr = (struct sockaddr*)&addr6;
515 		len = sizeof(addr6);
516 		break;
517 
518 	default:
519 		/* unreachable */
520 		abort();
521 	}
522 
523 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
524 		fatal("socket: %s", strerror(errno));
525 
526 	v = 1;
527 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
528 		fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
529 
530 	v = 1;
531 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
532 		fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
533 
534 	mark_nonblock(sock);
535 
536 	if (bind(sock, addr, len) == -1)
537 		fatal("bind: %s", strerror(errno));
538 
539 	if (listen(sock, 16) == -1)
540 		fatal("listen: %s", strerror(errno));
541 
542 	return sock;
543 }
544 
545 void
546 do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
547 {
548 	int i, fd;
549 	struct sockaddr_storage addr;
550 	socklen_t len;
551 
552 	len = sizeof(addr);
553 	if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
554 		if (errno == EWOULDBLOCK)
555 			return;
556 		fatal("accept: %s", strerror(errno));
557 	}
558 
559 	mark_nonblock(fd);
560 
561 	for (i = 0; i < MAX_USERS; ++i) {
562 		if (fds[i].fd == -1) {
563 			bzero(&clients[i], sizeof(struct client));
564 			if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
565 				break; /* goodbye fd! */
566 
567 			fds[i].fd = fd;
568 			fds[i].events = POLLIN;
569 
570 			clients[i].state = S_HANDSHAKE;
571 			clients[i].fd = -1;
572 			clients[i].child = 0;
573 			clients[i].waiting_on_child = 0;
574 			clients[i].buf = MAP_FAILED;
575 			clients[i].af = AF_INET;
576 			clients[i].addr = addr;
577 
578 			connected_clients++;
579 			return;
580 		}
581 	}
582 
583 	close(fd);
584 }
585 
586 void
587 goodbye(struct pollfd *pfd, struct client *c)
588 {
589 	c->state = S_CLOSING;
590 
591 	switch (tls_close(c->ctx)) {
592 	case TLS_WANT_POLLIN:
593 		pfd->events = POLLIN;
594 		return;
595 	case TLS_WANT_POLLOUT:
596 		pfd->events = POLLOUT;
597 		return;
598 	}
599 
600 	connected_clients--;
601 
602 	tls_free(c->ctx);
603 	c->ctx = NULL;
604 
605 	if (c->buf != MAP_FAILED)
606 		munmap(c->buf, c->len);
607 
608 	if (c->fd != -1)
609 		close(c->fd);
610 
611 	close(pfd->fd);
612 	pfd->fd = -1;
613 }
614 
615 void
616 loop(struct tls *ctx, int sock4, int sock6)
617 {
618 	int i;
619 	struct client clients[MAX_USERS];
620 	struct pollfd fds[MAX_USERS];
621 
622 	for (i = 0; i < MAX_USERS; ++i) {
623 		fds[i].fd = -1;
624 		fds[i].events = POLLIN;
625 		bzero(&clients[i], sizeof(struct client));
626 	}
627 
628 	fds[0].fd = sock4;
629 	fds[1].fd = sock6;
630 
631 	for (;;) {
632 		if (poll(fds, MAX_USERS, INFTIM) == -1) {
633 			if (errno == EINTR) {
634                                 warnx("connected clients: %d",
635 				    connected_clients);
636 				continue;
637 			}
638 			fatal("poll: %s", strerror(errno));
639 		}
640 
641 		for (i = 0; i < MAX_USERS; i++) {
642 			if (fds[i].revents == 0)
643 				continue;
644 
645 			if (fds[i].revents & (POLLERR|POLLNVAL))
646 				fatal("bad fd %d: %s", fds[i].fd,
647 				    strerror(errno));
648 
649 			if (fds[i].revents & POLLHUP) {
650 				/* fds[i] may be the fd of the stdin
651 				 * of a cgi script that has exited. */
652 				if (!clients[i].waiting_on_child) {
653 					goodbye(&fds[i], &clients[i]);
654 					continue;
655 				}
656 			}
657 
658 			if (fds[i].fd == sock4)
659 				do_accept(sock4, ctx, fds, clients);
660 			else if (fds[i].fd == sock6)
661 				do_accept(sock6, ctx, fds, clients);
662 			else
663 				handle(&fds[i], &clients[i]);
664 		}
665 	}
666 }
667 
668 char *
669 absolutify_path(const char *path)
670 {
671 	char *wd, *r;
672 
673 	if (*path == '/')
674 		return strdup(path);
675 
676 	wd = getcwd(NULL, 0);
677 	if (asprintf(&r, "%s/%s", wd, path) == -1)
678 		err(1, "asprintf");
679 	free(wd);
680 	return r;
681 }
682 
683 void
684 yyerror(const char *msg)
685 {
686 	goterror = 1;
687 	fprintf(stderr, "%d: %s\n", yylineno, msg);
688 }
689 
690 int
691 parse_portno(const char *p)
692 {
693 	char *ep;
694 	long lval;
695 
696 	errno = 0;
697 	lval = strtol(p, &ep, 10);
698 	if (p[0] == '\0' || *ep != '\0')
699 		errx(1, "not a number: %s", p);
700 	if (lval < 0 || lval > UINT16_MAX)
701 		errx(1, "port number out of range for domain %s: %ld", p, lval);
702 	return lval;
703 }
704 
705 void
706 parse_conf(const char *path)
707 {
708 	if ((yyin = fopen(path, "r")) == NULL)
709 		err(1, "cannot open config %s", path);
710 	yyparse();
711 	fclose(yyin);
712 
713 	if (goterror)
714 		exit(1);
715 }
716 
717 void
718 load_vhosts(struct tls_config *tlsconf)
719 {
720 	struct vhost *h;
721 
722 	/* we need to set something, then we can add how many key we want */
723 	if (tls_config_set_keypair_file(tlsconf, hosts->cert, hosts->key))
724 		errx(1, "tls_config_set_keypair_file failed");
725 
726 	for (h = hosts; h->domain != NULL; ++h) {
727 		if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
728 			errx(1, "failed to load the keypair (%s, %s)",
729 			    h->cert, h->key);
730 
731 		if ((h->dirfd = open(h->dir, O_RDONLY | O_DIRECTORY)) == -1)
732 			err(1, "open %s for domain %s", h->dir, h->domain);
733 	}
734 }
735 
736 int
737 listener_main()
738 {
739 	int sock4, sock6;
740 	struct tls *ctx = NULL;
741 	struct tls_config *tlsconf;
742 
743 	if ((tlsconf = tls_config_new()) == NULL)
744 		err(1, "tls_config_new");
745 
746 	/* optionally accept client certs, but don't try to verify them */
747 	tls_config_verify_client_optional(tlsconf);
748 	tls_config_insecure_noverifycert(tlsconf);
749 
750 	if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
751 		err(1, "tls_config_set_protocols");
752 
753 	if ((ctx = tls_server()) == NULL)
754 		errx(1, "tls_server failure");
755 
756 	load_vhosts(tlsconf);
757 
758 	if (tls_configure(ctx, tlsconf) == -1)
759 		errx(1, "tls_configure: %s", tls_error(ctx));
760 
761 	if (!conf.foreground && daemon(0, 1) == -1)
762 		exit(1);
763 
764 	sock4 = make_socket(conf.port, AF_INET);
765 	sock6 = -1;
766 	if (conf.ipv6)
767 		sock6 = make_socket(conf.port, AF_INET6);
768 
769 	sandbox();
770 	loop(ctx, sock4, sock6);
771 
772 	return 0;
773 }
774 
775 void
776 usage(const char *me)
777 {
778 	fprintf(stderr,
779 	    "USAGE: %s [-n] [-c config] | [-6fh] [-C cert] [-d root] [-K key] "
780 	    "[-p port] [-x cgi-bin]\n",
781 	    me);
782 }
783 
784 int
785 main(int argc, char **argv)
786 {
787 	int ch, p[2];
788 	const char *config_path = NULL;
789 	size_t i;
790 	int conftest = 0;
791 
792 	bzero(hosts, sizeof(hosts));
793 	for (i = 0; i < HOSTSLEN; ++i)
794 		hosts[i].dirfd = -1;
795 
796 	conf.foreground = 1;
797 	conf.port = 1965;
798 	conf.ipv6 = 0;
799 	conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
800 
801 	connected_clients = 0;
802 
803 	while ((ch = getopt(argc, argv, "6C:c:d:fhK:np:x:")) != -1) {
804 		switch (ch) {
805 		case '6':
806 			conf.ipv6 = 1;
807 			break;
808 
809 		case 'C':
810 			hosts[0].cert = optarg;
811 			break;
812 
813 		case 'c':
814 			config_path = optarg;
815 			break;
816 
817 		case 'd':
818 			free((char*)hosts[0].dir);
819 			if ((hosts[0].dir = absolutify_path(optarg)) == NULL)
820 				err(1, "absolutify_path");
821 			break;
822 
823 		case 'f':
824 			conf.foreground = 1;
825 			break;
826 
827 		case 'h':
828 			usage(*argv);
829 			return 0;
830 
831 		case 'K':
832 			hosts[0].key = optarg;
833 			break;
834 
835 		case 'n':
836 			conftest = 1;
837 			break;
838 
839 		case 'p':
840 			conf.port = parse_portno(optarg);
841 			break;
842 
843 		case 'x':
844 			/* drop the starting / (if any) */
845 			if (*optarg == '/')
846 				optarg++;
847 			hosts[0].cgi = optarg;
848 			break;
849 
850 		default:
851 			usage(*argv);
852 			return 1;
853 		}
854 	}
855 
856 	if (config_path != NULL) {
857 		if (hosts[0].cert != NULL || hosts[0].key != NULL ||
858 		    hosts[0].dir != NULL)
859 			errx(1, "can't specify options in conf mode");
860 		parse_conf(config_path);
861 	} else {
862 		if (hosts[0].cert == NULL || hosts[0].key == NULL ||
863 		    hosts[0].dir == NULL)
864 			errx(1, "missing cert, key or root directory to serve");
865 		hosts[0].domain = "*";
866 	}
867 
868 	if (conftest)
869                 errx(0, "config OK");
870 
871 	signal(SIGPIPE, SIG_IGN);
872 	signal(SIGCHLD, SIG_IGN);
873 
874 #ifdef SIGINFO
875 	signal(SIGINFO, sig_handler);
876 #endif
877 	signal(SIGUSR2, sig_handler);
878 
879 	if (!conf.foreground)
880 		signal(SIGHUP, SIG_IGN);
881 
882 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
883 		fatal("socketpair: %s", strerror(errno));
884 
885 	switch (fork()) {
886 	case -1:
887 		fatal("fork: %s", strerror(errno));
888 
889 	case 0:			/* child */
890 		close(p[0]);
891 		exfd = p[1];
892 		listener_main();
893 		_exit(0);
894 
895 	default:		/* parent */
896 		close(p[1]);
897 		return executor_main(p[0]);
898 	}
899 }