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/socket.h>
19 #include <sys/stat.h>
20 
21 #include <arpa/inet.h>
22 #include <netinet/in.h>
23 
24 #include <assert.h>
25 #include <err.h>
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <poll.h>
29 #include <signal.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <tls.h>
34 #include <unistd.h>
35 
36 #ifndef __OpenBSD__
37 # define pledge(a, b) 0
38 # define unveil(a, b) 0
39 #endif /* __OpenBSD__ */
40 
41 #ifndef INFTIM
42 # define INFTIM -1
43 #endif /* INFTIM */
44 
45 #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */
46 
47 /* large enough to hold a copy of a gemini URL and still have extra room */
48 #define PATHBUF		2048
49 
50 #define SUCCESS		20
51 #define TEMP_FAILURE	40
52 #define NOT_FOUND	51
53 #define BAD_REQUEST	59
54 
55 #ifndef MAX_USERS
56 #define MAX_USERS	64
57 #endif
58 
59 enum {
60 	S_OPEN,
61 	S_INITIALIZING,
62 	S_SENDING,
63 	S_CLOSING,
64 };
65 
66 struct client {
67 	struct tls	*ctx;
68 	int		 state;
69 	int		 code;
70 	const char	*meta;
71 	int		 fd;
72 	pid_t		 child;
73 	void		*buf, *i;
74 	ssize_t		 len, off;
75 	int		 af;
76 	struct in_addr	 addr;
77 };
78 
79 struct etm {			/* file extension to mime */
80 	const char	*mime;
81 	const char	*ext;
82 } filetypes[] = {
83 	{"application/pdf",	"pdf"},
84 
85 	{"image/gif",		"gif"},
86 	{"image/jpeg",		"jpg"},
87 	{"image/jpeg",		"jpeg"},
88 	{"image/png",		"png"},
89 	{"image/svg+xml",	"svg"},
90 
91 	{"text/gemini",		"gemini"},
92 	{"text/gemini",		"gmi"},
93 	{"text/markdown",	"markdown"},
94 	{"text/markdown",	"md"},
95 	{"text/plain",		"txt"},
96 	{"text/xml",		"xml"},
97 
98 	{NULL, NULL}
99 };
100 
101 #define LOG(c, fmt, ...)						\
102 	do {								\
103 		char buf[INET_ADDRSTRLEN];				\
104 		if (inet_ntop((c)->af, &(c)->addr, buf, sizeof(buf)) == NULL) \
105 			err(1, "inet_ntop");				\
106 		dprintf(logfd, "[%s] " fmt "\n", buf, __VA_ARGS__);	\
107 	} while (0)
108 
109 const char *dir;
110 int dirfd, logfd;
111 int cgi;
112 
113 char		*url_after_proto(char*);
114 char		*url_start_of_request(char*);
115 int		 url_trim(struct client*, char*);
116 char		*adjust_path(char*);
117 int		 path_isdir(char*);
118 ssize_t		 filesize(int);
119 
120 int		 start_reply(struct pollfd*, struct client*, int, const char*);
121 const char	*path_ext(const char*);
122 const char	*mime(const char*);
123 int		 open_file(char*, struct pollfd*, struct client*);
124 void		 start_cgi(const char*, struct pollfd*, struct client*);
125 void		 handle_cgi(struct pollfd*, struct client*);
126 void		 send_file(char*, struct pollfd*, struct client*);
127 void		 send_dir(char*, struct pollfd*, struct client*);
128 void		 handle(struct pollfd*, struct client*);
129 
130 void		 mark_nonblock(int);
131 int		 make_soket(int);
132 void		 do_accept(int, struct tls*, struct pollfd*, struct client*);
133 void		 goodbye(struct pollfd*, struct client*);
134 void		 loop(struct tls*, int);
135 
136 void		 usage(const char*);
137 
138 char *
139 url_after_proto(char *url)
140 {
141 	char *s;
142 	const char *proto = "gemini";
143 	const char *marker = "://";
144 	size_t i;
145 
146 	/* a relative URL */
147 	if ((s = strstr(url, marker)) == NULL)
148 		return url;
149 
150 	if (s - strlen(proto) != url)
151 		return NULL;
152 
153 	for (i = 0; proto[i] != '\0'; ++i)
154 		if (url[i] != proto[i])
155 			return NULL;
156 
157 	/* a valid gemini:// URL */
158 	return s + strlen(marker);
159 }
160 
161 char *
162 url_start_of_request(char *url)
163 {
164 	char *s, *t;
165 
166 	if ((s = url_after_proto(url)) == NULL)
167 		return NULL;
168 
169 	if ((t = strstr(s, "/")) == NULL)
170 		return s + strlen(s);
171 	return t;
172 }
173 
174 int
175 url_trim(struct client *c, char *url)
176 {
177 	const char *e = "\r\n";
178 	char *s;
179 
180 	if ((s = strstr(url, e)) == NULL)
181 		return 0;
182 	s[0] = '\0';
183 	s[1] = '\0';
184 
185 	if (s[2] != '\0') {
186 		LOG(c, "%s", "request longer than 1024 bytes\n");
187 		return 0;
188 	}
189 
190 	return 1;
191 }
192 
193 char *
194 adjust_path(char *path)
195 {
196 	char *s, *query;
197 	size_t len;
198 
199 	if ((query = strchr(path, '?')) != NULL) {
200 		*query = '\0';
201 		query++;
202 	}
203 
204 	/* /.. -> / */
205 	len = strlen(path);
206 	if (len >= 3) {
207 		if (!strcmp(&path[len-3], "/..")) {
208 			path[len-2] = '\0';
209 		}
210 	}
211 
212 	/* if the path is only `..` trim out and exit */
213 	if (!strcmp(path, "..")) {
214 		path[0] = '\0';
215 		return query;
216 	}
217 
218 	/* remove every ../ in the path */
219 	while (1) {
220 		if ((s = strstr(path, "../")) == NULL)
221 			return query;
222 		memmove(s, s+3, strlen(s)+1);	/* copy also the \0 */
223 	}
224 }
225 
226 int
227 path_isdir(char *path)
228 {
229 	if (*path == '\0')
230 		return 1;
231 	return path[strlen(path)-1] == '/';
232 }
233 
234 int
235 start_reply(struct pollfd *pfd, struct client *client, int code, const char *reason)
236 {
237 	char buf[1030] = {0}; 	/* status + ' ' + max reply len + \r\n\0 */
238 	int len;
239 	int ret;
240 
241 	client->code = code;
242 	client->meta = reason;
243 	client->state = S_INITIALIZING;
244 
245 	len = snprintf(buf, sizeof(buf), "%d %s\r\n", code, reason);
246 	assert(len < (int)sizeof(buf));
247 	ret = tls_write(client->ctx, buf, len);
248 	if (ret == TLS_WANT_POLLIN) {
249 		pfd->events = POLLIN;
250 		return 0;
251 	}
252 
253 	if (ret == TLS_WANT_POLLOUT) {
254 		pfd->events = POLLOUT;
255 		return 0;
256 	}
257 
258 	return 1;
259 }
260 
261 ssize_t
262 filesize(int fd)
263 {
264 	ssize_t len;
265 
266 	if ((len = lseek(fd, 0, SEEK_END)) == -1)
267 		return -1;
268 	if (lseek(fd, 0, SEEK_SET) == -1)
269 		return -1;
270 	return len;
271 }
272 
273 const char *
274 path_ext(const char *path)
275 {
276 	const char *end;
277 
278 	end = path + strlen(path)-1; /* the last byte before the NUL */
279 	for (; end != path; --end) {
280 		if (*end == '.')
281 			return end+1;
282 		if (*end == '/')
283 			break;
284 	}
285 
286 	return NULL;
287 }
288 
289 const char *
290 mime(const char *path)
291 {
292 	const char *ext, *def = "application/octet-stream";
293 	struct etm *t;
294 
295 	if ((ext = path_ext(path)) == NULL)
296 		return def;
297 
298 	for (t = filetypes; t->mime != NULL; ++t)
299 		if (!strcmp(ext, t->ext))
300 			return t->mime;
301 
302 	return def;
303 }
304 
305 int
306 open_file(char *path, struct pollfd *fds, struct client *c)
307 {
308 	char fpath[PATHBUF];
309 	struct stat sb;
310 
311 	assert(path != NULL);
312 
313 	bzero(fpath, sizeof(fpath));
314 
315 	if (*path != '.')
316 		fpath[0] = '.';
317 	strlcat(fpath, path, PATHBUF);
318 
319 	if ((c->fd = openat(dirfd, fpath,
320 		    O_RDONLY | O_NOFOLLOW | O_CLOEXEC)) == -1) {
321 		LOG(c, "open failed: %s", fpath);
322 		if (!start_reply(fds, c, NOT_FOUND, "not found"))
323 			return 0;
324 		goodbye(fds, c);
325 		return 0;
326 	}
327 
328 	if (fstat(c->fd, &sb) == -1) {
329 		LOG(c, "fstat failed for %s", fpath);
330 		if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
331 			return 0;
332 		goodbye(fds, c);
333 		return 0;
334 	}
335 
336 	if (S_ISDIR(sb.st_mode)) {
337 		LOG(c, "%s is a directory, trying %s/index.gmi", fpath, fpath);
338 		close(c->fd);
339 		c->fd = -1;
340 		send_dir(fpath, fds, c);
341 		return 0;
342 	}
343 
344 	if (cgi && (sb.st_mode & S_IXUSR)) {
345 		start_cgi(fpath, fds, c);
346 		return 0;
347 	}
348 
349 	if ((c->len = filesize(c->fd)) == -1) {
350 		LOG(c, "failed to get file size for %s", fpath);
351 		goodbye(fds, c);
352 		return 0;
353 	}
354 
355 	if ((c->buf = mmap(NULL, c->len, PROT_READ, MAP_PRIVATE,
356 		    c->fd, 0)) == MAP_FAILED) {
357 		warn("mmap: %s", fpath);
358 		goodbye(fds, c);
359 		return 0;
360 	}
361 	c->i = c->buf;
362 
363 	return start_reply(fds, c, SUCCESS, mime(fpath));
364 }
365 
366 void
367 start_cgi(const char *path, struct pollfd *fds, struct client *c)
368 {
369 	pid_t pid;
370 	int p[2];
371 
372 	if (pipe(p) == -1)
373 		goto err;
374 
375 	switch (pid = fork()) {
376 	case -1:
377 		goto err;
378 
379 	case 0: {		/* child */
380                 char *expath;
381 		char addr[INET_ADDRSTRLEN];
382 		char *argv[] = { NULL, NULL, NULL };
383 		char *envp[] = {
384 			/* inherited */
385 			"PATH=",
386 
387 			/* CGI */
388 			"SERVER_SOFTWARE=gmid",
389 			/* "SERVER_NAME=example.com", */
390 			/* "GATEWAY_INTERFACE=CGI/version" */
391 			"SERVER_PROTOCOL=gemini",
392 			"SERVER_PORT=1965",
393 			/* "PATH_INFO=" */
394 			/* "PATH_TRANSLATED=" */
395 			/* "SCRIPT_NAME=" */
396 			/* "QUERY_STRING=" */
397                         "REMOTE_ADDR=",
398 			NULL,
399 		};
400 		size_t i;
401 
402 		close(p[0]);	/* close the read end */
403 		if (dup2(p[1], 1) == -1)
404 			goto childerr;
405 
406 		if (inet_ntop(c->af, &c->addr, addr, sizeof(addr)) == NULL)
407                         goto childerr;
408 
409 		/* skip the ./ at the start of path*/
410 		if (asprintf(&expath, "%s%s", dir, path+2) == -1)
411 			goto childerr;
412 		argv[0] = argv[1] = expath;
413 
414 		/* fix the envp */
415 		for (i = 0; envp[i] != NULL; ++i) {
416 			if (!strcmp(envp[i], "PATH="))
417 				envp[i] = getenv("PATH");
418 			else if (!strcmp(envp[i], "REMOTE_ADDR="))
419 				envp[i] = addr;
420 			/* else if (!strcmp(envp[i], "PATH_INFO")) */
421 			/* ... */
422 		}
423 
424 		execvpe(expath, argv, envp);
425 		goto childerr;
426 	}
427 
428 	default:		/* parent */
429 		close(p[1]);	/* close the write end */
430 		close(c->fd);
431 		c->fd = p[0];
432 		c->child = pid;
433 		handle_cgi(fds, c);
434 		return;
435 	}
436 
437 err:
438 	if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
439 		return;
440 	goodbye(fds, c);
441 	return;
442 
443 childerr:
444 	dprintf(p[1], "%d internal server error\r\n", TEMP_FAILURE);
445 	close(p[1]);
446         _exit(1);
447 }
448 
449 void
450 handle_cgi(struct pollfd *fds, struct client *c)
451 {
452 	char buf[1024];
453 	ssize_t r, todo;
454 
455 	while (1) {
456 		r = read(c->fd, buf, sizeof(buf));
457 		if (r == -1 || r == 0)
458 			break;
459 		todo = r;
460 		while (todo > 0) {
461 			switch (r = tls_write(c->ctx, buf, todo)) {
462 			case -1:
463 				goto end;
464 
465 			case TLS_WANT_POLLOUT:
466 			case TLS_WANT_POLLIN:
467 				/* evil! */
468 				continue;
469 
470 			default:
471 				todo -= r;
472 			}
473 		}
474 	}
475 
476 end:
477 	goodbye(fds, c);
478 }
479 
480 void
481 send_file(char *path, struct pollfd *fds, struct client *c)
482 {
483 	ssize_t ret, len;
484 
485 	if (c->fd == -1) {
486 		if (!open_file(path, fds, c))
487 			return;
488 		c->state = S_SENDING;
489 	}
490 
491 	len = (c->buf + c->len) - c->i;
492 
493 	while (len > 0) {
494 		switch (ret = tls_write(c->ctx, c->i, len)) {
495 		case -1:
496 			LOG(c, "tls_write: %s", tls_error(c->ctx));
497 			goodbye(fds, c);
498 			return;
499 
500 		case TLS_WANT_POLLIN:
501 			fds->events = POLLIN;
502 			return;
503 
504 		case TLS_WANT_POLLOUT:
505 			fds->events = POLLOUT;
506 			return;
507 
508 		default:
509 			c->i += ret;
510 			len -= ret;
511 			break;
512 		}
513 	}
514 
515 	goodbye(fds, c);
516 }
517 
518 void
519 send_dir(char *path, struct pollfd *fds, struct client *client)
520 {
521 	char fpath[PATHBUF];
522 	size_t len;
523 
524 	bzero(fpath, PATHBUF);
525 
526 	if (path[0] != '.')
527 		fpath[0] = '.';
528 
529 	/* this cannot fail since sizeof(fpath) > maxlen of path */
530 	strlcat(fpath, path, PATHBUF);
531 	len = strlen(fpath);
532 
533 	/* add a trailing / in case. */
534 	if (fpath[len-1] != '/') {
535 		fpath[len] = '/';
536 	}
537 
538 	strlcat(fpath, "index.gmi", sizeof(fpath));
539 
540 	send_file(fpath, fds, client);
541 }
542 
543 void
544 handle(struct pollfd *fds, struct client *client)
545 {
546 	char buf[GEMINI_URL_LEN];
547 	char *path;
548 	char *query;
549 
550 	switch (client->state) {
551 	case S_OPEN:
552 		bzero(buf, GEMINI_URL_LEN);
553 		switch (tls_read(client->ctx, buf, sizeof(buf)-1)) {
554 		case -1:
555 			LOG(client, "tls_read: %s", tls_error(client->ctx));
556 			goodbye(fds, client);
557 			return;
558 
559 		case TLS_WANT_POLLIN:
560 			fds->events = POLLIN;
561 			return;
562 
563 		case TLS_WANT_POLLOUT:
564 			fds->events = POLLOUT;
565 			return;
566 		}
567 
568 		if (!url_trim(client, buf)) {
569 			if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
570 				return;
571 			goodbye(fds, client);
572 			return;
573 		}
574 
575 		if ((path = url_start_of_request(buf)) == NULL) {
576 			if (!start_reply(fds, client, BAD_REQUEST, "bad request"))
577 				return;
578 			goodbye(fds, client);
579 			return;
580 		}
581 
582 		query = adjust_path(path);
583 		LOG(client, "get %s%s%s", path,
584 		    query ? "?" : "",
585 		    query ? query : "");
586 
587 		if (path_isdir(path))
588 			send_dir(path, fds, client);
589 		else
590 			send_file(path, fds, client);
591 		break;
592 
593 	case S_INITIALIZING:
594 		if (!start_reply(fds, client, client->code, client->meta))
595 			return;
596 
597 		if (client->code != SUCCESS) {
598 			/* we don't need a body */
599 			goodbye(fds, client);
600 			return;
601 		}
602 
603 		client->state = S_SENDING;
604 
605 		/* fallthrough */
606 
607 	case S_SENDING:
608 		send_file(NULL, fds, client);
609 		break;
610 
611 	case S_CLOSING:
612 		goodbye(fds, client);
613 		break;
614 
615 	default:
616 		/* unreachable */
617 		abort();
618 	}
619 }
620 
621 void
622 mark_nonblock(int fd)
623 {
624 	int flags;
625 
626 	if ((flags = fcntl(fd, F_GETFL)) == -1)
627 		err(1, "fcntl(F_GETFL)");
628 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
629 		err(1, "fcntl(F_SETFL)");
630 }
631 
632 int
633 make_socket(int port, int family)
634 {
635 	int sock, v;
636 	struct sockaddr_in addr4;
637 	struct sockaddr_in6 addr6;
638 	struct sockaddr *addr;
639 	socklen_t len;
640 
641         switch (family) {
642 	case AF_INET:
643 		bzero(&addr4, sizeof(addr4));
644 		addr4.sin_family = family;
645 		addr4.sin_port = htons(port);
646 		addr4.sin_addr.s_addr = INADDR_ANY;
647 		addr = (struct sockaddr*)&addr4;
648 		len = sizeof(addr4);
649 		break;
650 
651 	case AF_INET6:
652 		bzero(&addr6, sizeof(addr6));
653 		addr6.sin6_family = AF_INET6;
654 		addr6.sin6_port = htons(port);
655 		addr6.sin6_addr = in6addr_any;
656 		addr = (struct sockaddr*)&addr6;
657 		len = sizeof(addr6);
658 		break;
659 
660 	default:
661 		/* unreachable */
662 		abort();
663 	}
664 
665 	if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
666 		err(1, "socket");
667 
668 	v = 1;
669 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
670 		err(1, "setsockopt(SO_REUSEADDR)");
671 
672 	v = 1;
673 	if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
674 		err(1, "setsockopt(SO_REUSEPORT)");
675 
676 	mark_nonblock(sock);
677 
678 	if (bind(sock, addr, len) == -1)
679 		err(1, "bind");
680 
681 	if (listen(sock, 16) == -1)
682 		err(1, "listen");
683 
684 	return sock;
685 }
686 
687 void
688 do_accept(int sock, struct tls *ctx, struct pollfd *fds, struct client *clients)
689 {
690 	int i, fd;
691 	struct sockaddr_in addr;
692 	socklen_t len;
693 
694 	len = sizeof(addr);
695 	if ((fd = accept(sock, (struct sockaddr*)&addr, &len)) == -1) {
696 		if (errno == EWOULDBLOCK)
697 			return;
698 		err(1, "accept");
699 	}
700 
701 	mark_nonblock(fd);
702 
703 	for (i = 0; i < MAX_USERS; ++i) {
704 		if (fds[i].fd == -1) {
705 			bzero(&clients[i], sizeof(struct client));
706 			if (tls_accept_socket(ctx, &clients[i].ctx, fd) == -1)
707 				break; /* goodbye fd! */
708 
709 			fds[i].fd = fd;
710 			fds[i].events = POLLIN;
711 
712 			clients[i].state = S_OPEN;
713 			clients[i].fd = -1;
714 			clients[i].child = -1;
715 			clients[i].buf = MAP_FAILED;
716 			clients[i].af = AF_INET;
717 			clients[i].addr = addr.sin_addr;
718 
719 			return;
720 		}
721 	}
722 
723 	close(fd);
724 }
725 
726 void
727 goodbye(struct pollfd *pfd, struct client *c)
728 {
729 	ssize_t ret;
730 
731 	c->state = S_CLOSING;
732 
733 	ret = tls_close(c->ctx);
734 	if (ret == TLS_WANT_POLLIN) {
735 		pfd->events = POLLIN;
736 		return;
737 	}
738 	if (ret == TLS_WANT_POLLOUT) {
739 		pfd->events = POLLOUT;
740 		return;
741 	}
742 
743 	tls_free(c->ctx);
744 	c->ctx = NULL;
745 
746 	if (c->buf != MAP_FAILED)
747 		munmap(c->buf, c->len);
748 
749 	if (c->fd != -1)
750 		close(c->fd);
751 
752 	close(pfd->fd);
753 	pfd->fd = -1;
754 }
755 
756 void
757 loop(struct tls *ctx, int sock)
758 {
759 	int i, todo;
760 	struct client clients[MAX_USERS];
761 	struct pollfd fds[MAX_USERS];
762 
763 	for (i = 0; i < MAX_USERS; ++i) {
764 		fds[i].fd = -1;
765 		fds[i].events = POLLIN;
766 		bzero(&clients[i], sizeof(struct client));
767 	}
768 
769 	fds[0].fd = sock;
770 
771 	for (;;) {
772 		if ((todo = poll(fds, MAX_USERS, INFTIM)) == -1)
773 			err(1, "poll");
774 
775 		for (i = 0; i < MAX_USERS; i++) {
776 			assert(i < MAX_USERS);
777 
778 			if (fds[i].revents == 0)
779 				continue;
780 
781 			if (fds[i].revents & (POLLERR|POLLNVAL))
782 				err(1, "bad fd %d", fds[i].fd);
783 
784 			if (fds[i].revents & POLLHUP) {
785 				goodbye(&fds[i], &clients[i]);
786 				continue;
787 			}
788 
789 			todo--;
790 
791 			if (i == 0) { /* new client */
792 				do_accept(sock, ctx, fds, clients);
793 				continue;
794 			}
795 
796 			handle(&fds[i], &clients[i]);
797 		}
798 	}
799 }
800 
801 void
802 usage(const char *me)
803 {
804 	fprintf(stderr,
805 	    "USAGE: %s [-h] [-c cert.pem] [-d docs] [-k key.pem]\n",
806 	    me);
807 }
808 
809 int
810 main(int argc, char **argv)
811 {
812 	const char *cert = "cert.pem", *key = "key.pem";
813 	struct tls *ctx = NULL;
814 	struct tls_config *conf;
815 	int sock, ch;
816 
817 	signal(SIGPIPE, SIG_IGN);
818 	signal(SIGCHLD, SIG_IGN);
819 
820 	dir = "docs/";
821 	logfd = 2;		/* stderr */
822 	cgi = 0;
823 
824 	while ((ch = getopt(argc, argv, "c:d:hk:l:x")) != -1) {
825 		switch (ch) {
826 		case 'c':
827 			cert = optarg;
828 			break;
829 
830 		case 'd':
831 			dir = optarg;
832 			break;
833 
834 		case 'h':
835 			usage(*argv);
836 			return 0;
837 
838 		case 'k':
839 			key = optarg;
840 			break;
841 
842 		case 'l':
843 			/* open log file or create it with 644 */
844 			if ((logfd = open(optarg, O_WRONLY | O_CREAT | O_CLOEXEC,
845 					S_IRUSR | S_IWUSR | S_IRGRP | S_IWOTH)) == -1)
846 				err(1, "%s", optarg);
847 			break;
848 
849 		case 'x':
850 			cgi = 1;
851 			break;
852 
853 		default:
854 			usage(*argv);
855 			return 1;
856 		}
857 	}
858 
859 	if ((conf = tls_config_new()) == NULL)
860 		err(1, "tls_config_new");
861 
862 	if (tls_config_set_protocols(conf,
863 	    TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3) == -1)
864 		err(1, "tls_config_set_protocols");
865 
866 	if (tls_config_set_cert_file(conf, cert) == -1)
867 		err(1, "tls_config_set_cert_file: %s", cert);
868 
869 	if (tls_config_set_key_file(conf, key) == -1)
870 		err(1, "tls_config_set_key_file: %s", key);
871 
872 	if ((ctx = tls_server()) == NULL)
873 		err(1, "tls_server");
874 
875 	if (tls_configure(ctx, conf) == -1)
876 		errx(1, "tls_configure: %s", tls_error(ctx));
877 
878 	sock = make_socket(1965, AF_INET);
879 
880 	if ((dirfd = open(dir, O_RDONLY | O_DIRECTORY)) == -1)
881 		err(1, "open: %s", dir);
882 
883 	if (unveil(dir, cgi ? "rx" : "r") == -1)
884 		err(1, "unveil");
885 
886 	if (pledge(cgi ? "stdio rpath inet proc exec" : "stdio rpath inet", NULL) == -1)
887 		err(1, "pledge");
888 
889 	loop(ctx, sock);
890 
891 	close(sock);
892 	tls_free(ctx);
893 	tls_config_free(conf);
894 }