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Date:: Mon Jul 4 14:31:17 2022 UTC
Message:: add a trailing / for dirs in the directory index.
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1 /*
2  * Copyright (c) 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 <assert.h>
22 #include <ctype.h>
23 #include <errno.h>
24 #include <event.h>
25 #include <fcntl.h>
26 #include <fnmatch.h>
27 #include <limits.h>
28 #include <string.h>
29 
30 #define MIN(a, b)	((a) < (b) ? (a) : (b))
31 
32 int shutting_down;
33 
34 static struct tls	*ctx;
35 
36 static struct event e4, e6, imsgev, siginfo, sigusr2;
37 static int has_ipv6, has_siginfo;
38 
39 int connected_clients;
40 
41 static inline int matches(const char*, const char*);
42 
43 static int	 check_path(struct client*, const char*, int*);
44 static void	 open_file(struct client*);
45 static void	 check_for_cgi(struct client*);
46 static void	 handle_handshake(int, short, void*);
47 static const char *strip_path(const char*, int);
48 static void	 fmt_sbuf(const char*, struct client*, const char*);
49 static int	 apply_block_return(struct client*);
50 static int	 check_matching_certificate(X509_STORE *, struct client *);
51 static int	 apply_reverse_proxy(struct client *);
52 static int	 apply_fastcgi(struct client*);
53 static int	 apply_require_ca(struct client*);
54 static size_t	 host_nth(struct vhost*);
55 static void	 start_cgi(const char*, const char*, struct client*);
56 static void	 open_dir(struct client*);
57 static void	 redirect_canonical_dir(struct client*);
58 
59 static void	 client_tls_readcb(int, short, void *);
60 static void	 client_tls_writecb(int, short, void *);
61 
62 static void	 client_read(struct bufferevent *, void *);
63 void		 client_write(struct bufferevent *, void *);
64 static void	 client_error(struct bufferevent *, short, void *);
65 
66 static void	 client_close_ev(int, short, void *);
67 
68 static void	 cgi_read(struct bufferevent *, void *);
69 static void	 cgi_write(struct bufferevent *, void *);
70 static void	 cgi_error(struct bufferevent *, short, void *);
71 
72 static void	 do_accept(int, short, void*);
73 
74 static void	 handle_imsg_cgi_res(struct imsgbuf*, struct imsg*, size_t);
75 static void	 handle_imsg_fcgi_fd(struct imsgbuf*, struct imsg*, size_t);
76 static void	 handle_imsg_conn_fd(struct imsgbuf*, struct imsg*, size_t);
77 static void	 handle_imsg_quit(struct imsgbuf*, struct imsg*, size_t);
78 static void	 handle_dispatch_imsg(int, short, void *);
79 static void	 handle_siginfo(int, short, void*);
80 
81 static imsg_handlerfn *handlers[] = {
82 	[IMSG_QUIT] = handle_imsg_quit,
83 	[IMSG_CGI_RES] = handle_imsg_cgi_res,
84 	[IMSG_FCGI_FD] = handle_imsg_fcgi_fd,
85 	[IMSG_CONN_FD] = handle_imsg_conn_fd,
86 };
87 
88 static uint32_t server_client_id;
89 
90 struct client_tree_id clients;
91 
92 static inline int
93 matches(const char *pattern, const char *path)
94 {
95 	if (*path == '/')
96 		path++;
97 	return !fnmatch(pattern, path, 0);
98 }
99 
100 const char *
101 vhost_lang(struct vhost *v, const char *path)
102 {
103 	struct location *loc;
104 
105 	if (v == NULL || path == NULL)
106 		return NULL;
107 
108 	loc = TAILQ_FIRST(&v->locations);
109 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
110 		if (loc->lang != NULL) {
111 			if (matches(loc->match, path))
112 				return loc->lang;
113 		}
114 	}
115 
116 	return TAILQ_FIRST(&v->locations)->lang;
117 }
118 
119 const char *
120 vhost_default_mime(struct vhost *v, const char *path)
121 {
122 	struct location *loc;
123 	const char *default_mime = "application/octet-stream";
124 
125 	if (v == NULL || path == NULL)
126 		return default_mime;
127 
128 	loc = TAILQ_FIRST(&v->locations);
129 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
130 		if (loc->default_mime != NULL) {
131 			if (matches(loc->match, path))
132 				return loc->default_mime;
133 		}
134 	}
135 
136 	loc = TAILQ_FIRST(&v->locations);
137 	if (loc->default_mime != NULL)
138 		return loc->default_mime;
139 	return default_mime;
140 }
141 
142 const char *
143 vhost_index(struct vhost *v, const char *path)
144 {
145 	struct location *loc;
146 	const char *index = "index.gmi";
147 
148 	if (v == NULL || path == NULL)
149 		return index;
150 
151 	loc = TAILQ_FIRST(&v->locations);
152 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
153 		if (loc->index != NULL) {
154 			if (matches(loc->match, path))
155 				return loc->index;
156 		}
157 	}
158 
159 	loc = TAILQ_FIRST(&v->locations);
160 	if (loc->index != NULL)
161 		return loc->index;
162 	return index;
163 }
164 
165 int
166 vhost_auto_index(struct vhost *v, const char *path)
167 {
168 	struct location *loc;
169 
170 	if (v == NULL || path == NULL)
171 		return 0;
172 
173 	loc = TAILQ_FIRST(&v->locations);
174 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
175 		if (loc->auto_index != 0) {
176 			if (matches(loc->match, path))
177 				return loc->auto_index == 1;
178 		}
179 	}
180 
181 	loc = TAILQ_FIRST(&v->locations);
182 	return loc->auto_index == 1;
183 }
184 
185 int
186 vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
187 {
188 	struct location *loc;
189 
190 	if (v == NULL || path == NULL)
191 		return 0;
192 
193 	loc = TAILQ_FIRST(&v->locations);
194 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
195 		if (loc->block_code != 0) {
196 			if (matches(loc->match, path)) {
197 				*code = loc->block_code;
198 				*fmt = loc->block_fmt;
199 				return 1;
200 			}
201 		}
202 	}
203 
204 	loc = TAILQ_FIRST(&v->locations);
205 	*code = loc->block_code;
206 	*fmt = loc->block_fmt;
207 	return loc->block_code != 0;
208 }
209 
210 int
211 vhost_fastcgi(struct vhost *v, const char *path)
212 {
213 	struct location *loc;
214 
215 	if (v == NULL || path == NULL)
216 		return -1;
217 
218 	loc = TAILQ_FIRST(&v->locations);
219 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
220 		if (loc->fcgi != -1)
221 			if (matches(loc->match, path))
222 				return loc->fcgi;
223 	}
224 
225 	loc = TAILQ_FIRST(&v->locations);
226 	return loc->fcgi;
227 }
228 
229 int
230 vhost_dirfd(struct vhost *v, const char *path, size_t *retloc)
231 {
232 	struct location *loc;
233 	size_t		 l = 0;
234 
235 	if (v == NULL || path == NULL)
236 		return -1;
237 
238 	loc = TAILQ_FIRST(&v->locations);
239 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
240 		l++;
241 		if (loc->dirfd != -1)
242 			if (matches(loc->match, path)) {
243 				*retloc = l;
244 				return loc->dirfd;
245 			}
246 	}
247 
248 	*retloc = 0;
249 	loc = TAILQ_FIRST(&v->locations);
250 	return loc->dirfd;
251 }
252 
253 int
254 vhost_strip(struct vhost *v, const char *path)
255 {
256 	struct location *loc;
257 
258 	if (v == NULL || path == NULL)
259 		return 0;
260 
261 	loc = TAILQ_FIRST(&v->locations);
262 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
263 		if (loc->strip != 0) {
264 			if (matches(loc->match, path))
265 				return loc->strip;
266 		}
267 	}
268 
269 	loc = TAILQ_FIRST(&v->locations);
270 	return loc->strip;
271 }
272 
273 X509_STORE *
274 vhost_require_ca(struct vhost *v, const char *path)
275 {
276 	struct location *loc;
277 
278 	if (v == NULL || path == NULL)
279 		return NULL;
280 
281 	loc = TAILQ_FIRST(&v->locations);
282 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
283 		if (loc->reqca != NULL) {
284 			if (matches(loc->match, path))
285 				return loc->reqca;
286 		}
287 	}
288 
289 	loc = TAILQ_FIRST(&v->locations);
290 	return loc->reqca;
291 }
292 
293 int
294 vhost_disable_log(struct vhost *v, const char *path)
295 {
296 	struct location *loc;
297 
298 	if (v == NULL || path == NULL)
299 		return 0;
300 
301 	loc = TAILQ_FIRST(&v->locations);
302 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
303 		if (loc->disable_log && matches(loc->match, path))
304 				return 1;
305 	}
306 
307 	loc = TAILQ_FIRST(&v->locations);
308 	return loc->disable_log;
309 }
310 
311 static int
312 check_path(struct client *c, const char *path, int *fd)
313 {
314 	struct stat sb;
315 	const char *p;
316 	int dirfd, strip;
317 
318 	assert(path != NULL);
319 
320 	/*
321 	 * in send_dir we add an initial / (to be redirect-friendly),
322 	 * but here we want to skip it
323 	 */
324 	if (*path == '/')
325 		path++;
326 
327 	strip = vhost_strip(c->host, path);
328 	p = strip_path(path, strip);
329 
330 	if (*p == '/')
331 		p = p+1;
332 	if (*p == '\0')
333 		p = ".";
334 
335 	dirfd = vhost_dirfd(c->host, path, &c->loc);
336 	log_debug(c, "check_path: strip=%d path=%s original=%s",
337 	    strip, p, path);
338 	if (*fd == -1 && (*fd = openat(dirfd, p, O_RDONLY)) == -1) {
339 		if (errno == EACCES)
340 			log_info(c, "can't open %s: %s", p, strerror(errno));
341 		return FILE_MISSING;
342 	}
343 
344 	if (fstat(*fd, &sb) == -1) {
345 		log_notice(c, "failed stat for %s: %s", path, strerror(errno));
346 		return FILE_MISSING;
347 	}
348 
349 	if (S_ISDIR(sb.st_mode))
350 		return FILE_DIRECTORY;
351 
352 	if (sb.st_mode & S_IXUSR)
353 		return FILE_EXECUTABLE;
354 
355 	return FILE_EXISTS;
356 }
357 
358 static void
359 open_file(struct client *c)
360 {
361 	switch (check_path(c, c->iri.path, &c->pfd)) {
362 	case FILE_EXECUTABLE:
363 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
364 			start_cgi(c->iri.path, "", c);
365 			return;
366 		}
367 
368 		/* fallthrough */
369 
370 	case FILE_EXISTS:
371 		c->type = REQUEST_FILE;
372 		start_reply(c, SUCCESS, mime(c->host, c->iri.path));
373 		return;
374 
375 	case FILE_DIRECTORY:
376 		open_dir(c);
377 		return;
378 
379 	case FILE_MISSING:
380 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
381 			check_for_cgi(c);
382 			return;
383 		}
384 		start_reply(c, NOT_FOUND, "not found");
385 		return;
386 
387 	default:
388 		/* unreachable */
389 		abort();
390 	}
391 }
392 
393 /*
394  * the inverse of this algorithm, i.e. starting from the start of the
395  * path + strlen(cgi), and checking if each component, should be
396  * faster.  But it's tedious to write.  This does the opposite: starts
397  * from the end and strip one component at a time, until either an
398  * executable is found or we emptied the path.
399  */
400 static void
401 check_for_cgi(struct client *c)
402 {
403 	char path[PATH_MAX];
404 	char *end;
405 
406 	strlcpy(path, c->iri.path, sizeof(path));
407 	end = strchr(path, '\0');
408 
409 	while (end > path) {
410 		/*
411 		 * go up one level.  UNIX paths are simple and POSIX
412 		 * dirname, with its ambiguities on if the given
413 		 * pointer is changed or not, gives me headaches.
414 		 */
415 		while (*end != '/' && end > path)
416 			end--;
417 
418 		if (end == path)
419 			break;
420 
421 		*end = '\0';
422 
423 		switch (check_path(c, path, &c->pfd)) {
424 		case FILE_EXECUTABLE:
425 			start_cgi(path, end+1, c);
426 			return;
427 		case FILE_MISSING:
428 			break;
429 		default:
430 			goto err;
431 		}
432 
433 		*end = '/';
434 		end--;
435 	}
436 
437 err:
438 	start_reply(c, NOT_FOUND, "not found");
439 	return;
440 }
441 
442 void
443 mark_nonblock(int fd)
444 {
445 	int flags;
446 
447 	if ((flags = fcntl(fd, F_GETFL)) == -1)
448 		fatal("fcntl(F_GETFL): %s", strerror(errno));
449 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
450 		fatal("fcntl(F_SETFL): %s", strerror(errno));
451 }
452 
453 static void
454 handle_handshake(int fd, short ev, void *d)
455 {
456 	struct client *c = d;
457 	struct vhost *h;
458 	struct alist *a;
459 	const char *servname;
460 	const char *parse_err = "unknown error";
461 
462 	switch (tls_handshake(c->ctx)) {
463 	case 0:  /* success */
464 	case -1: /* already handshaked */
465 		break;
466 	case TLS_WANT_POLLIN:
467 		event_once(c->fd, EV_READ, handle_handshake, c, NULL);
468 		return;
469 	case TLS_WANT_POLLOUT:
470 		event_once(c->fd, EV_WRITE, handle_handshake, c, NULL);
471 		return;
472 	default:
473 		/* unreachable */
474 		abort();
475 	}
476 
477 	c->bev = bufferevent_new(fd, client_read, client_write,
478 	    client_error, c);
479 	if (c->bev == NULL)
480 		fatal("%s: failed to allocate client buffer: %s",
481 		    __func__, strerror(errno));
482 
483 	event_set(&c->bev->ev_read, c->fd, EV_READ,
484 	    client_tls_readcb, c->bev);
485 	event_set(&c->bev->ev_write, c->fd, EV_WRITE,
486 	    client_tls_writecb, c->bev);
487 
488 #if HAVE_LIBEVENT2
489 	evbuffer_unfreeze(c->bev->input, 0);
490 	evbuffer_unfreeze(c->bev->output, 1);
491 #endif
492 
493 	if ((servname = tls_conn_servername(c->ctx)) == NULL) {
494 		log_debug(c, "handshake: missing SNI");
495 		goto err;
496 	}
497 
498 	if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
499 		log_info(c, "puny_decode: %s", parse_err);
500 		goto err;
501 	}
502 
503 	TAILQ_FOREACH(h, &hosts, vhosts) {
504 		if (matches(h->domain, c->domain))
505 			goto found;
506 		TAILQ_FOREACH(a, &h->aliases, aliases) {
507 			if (matches(a->alias, c->domain))
508 				goto found;
509 		}
510 	}
511 
512 found:
513 	log_debug(c, "handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
514 	    servname != NULL ? servname : "(null)",
515 	    c->domain,
516 	    h != NULL ? h->domain : "(null)");
517 
518 	if (h != NULL) {
519 		c->host = h;
520 		bufferevent_enable(c->bev, EV_READ);
521 		return;
522 	}
523 
524 err:
525 	start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
526 }
527 
528 static const char *
529 strip_path(const char *path, int strip)
530 {
531 	char *t;
532 
533 	while (strip > 0) {
534 		if ((t = strchr(path, '/')) == NULL) {
535 			path = strchr(path, '\0');
536 			break;
537 		}
538 		path = t;
539 		strip--;
540 	}
541 
542 	return path;
543 }
544 
545 static void
546 fmt_sbuf(const char *fmt, struct client *c, const char *path)
547 {
548 	size_t i;
549 	char buf[32];
550 
551 	memset(buf, 0, sizeof(buf));
552 	for (i = 0; *fmt; ++fmt) {
553 		if (i == sizeof(buf)-1 || *fmt == '%') {
554 			strlcat(c->sbuf, buf, sizeof(c->sbuf));
555 			memset(buf, 0, sizeof(buf));
556 			i = 0;
557 		}
558 
559 		if (*fmt != '%') {
560 			buf[i++] = *fmt;
561 			continue;
562 		}
563 
564 		switch (*++fmt) {
565 		case '%':
566 			strlcat(c->sbuf, "%", sizeof(c->sbuf));
567 			break;
568 		case 'p':
569 			if (*path != '/')
570 				strlcat(c->sbuf, "/", sizeof(c->sbuf));
571 			strlcat(c->sbuf, path, sizeof(c->sbuf));
572 			break;
573 		case 'q':
574 			strlcat(c->sbuf, c->iri.query, sizeof(c->sbuf));
575 			break;
576 		case 'P':
577 			snprintf(buf, sizeof(buf), "%d", conf.port);
578 			strlcat(c->sbuf, buf, sizeof(c->sbuf));
579 			memset(buf, 0, sizeof(buf));
580 			break;
581 		case 'N':
582 			strlcat(c->sbuf, c->domain, sizeof(c->sbuf));
583 			break;
584 		default:
585 			fatal("%s: unknown fmt specifier %c",
586 			    __func__, *fmt);
587 		}
588 	}
589 
590 	if (i != 0)
591 		strlcat(c->sbuf, buf, sizeof(c->sbuf));
592 }
593 
594 /* 1 if a matching `block return' (and apply it), 0 otherwise */
595 static int
596 apply_block_return(struct client *c)
597 {
598 	const char *fmt, *path;
599 	int code;
600 
601 	if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
602 		return 0;
603 
604 	path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
605 	fmt_sbuf(fmt, c, path);
606 
607 	start_reply(c, code, c->sbuf);
608 	return 1;
609 }
610 
611 static struct proxy *
612 matched_proxy(struct client *c)
613 {
614 	struct proxy	*p;
615 	const char	*proto;
616 	const char	*host;
617 	const char	*port;
618 
619 	TAILQ_FOREACH(p, &c->host->proxies, proxies) {
620 		if ((proto = p->match_proto) == NULL)
621 			proto = "gemini";
622 		if ((host = p->match_host) == NULL)
623 			host = "*";
624 		if ((port = p->match_port) == NULL)
625 			port = "*";
626 
627 		if (matches(proto, c->iri.schema) &&
628 		    matches(host, c->domain) &&
629 		    matches(port, c->iri.port))
630 			return p;
631 	}
632 
633 	return NULL;
634 }
635 
636 static int
637 check_matching_certificate(X509_STORE *store, struct client *c)
638 {
639 	const uint8_t	*cert;
640 	size_t		 len;
641 
642 	if (!tls_peer_cert_provided(c->ctx)) {
643 		start_reply(c, CLIENT_CERT_REQ, "client certificate required");
644 		return 1;
645 	}
646 
647 	cert = tls_peer_cert_chain_pem(c->ctx, &len);
648 	if (!validate_against_ca(store, cert, len)) {
649 		start_reply(c, CERT_NOT_AUTH, "certificate not authorised");
650 		return 1;
651 	}
652 
653 	return 0;
654 }
655 
656 /* 1 if matching a proxy relay-to (and apply it), 0 otherwise */
657 static int
658 apply_reverse_proxy(struct client *c)
659 {
660 	struct proxy	*p;
661 	struct connreq	 r;
662 
663 	if ((p = matched_proxy(c)) == NULL)
664 		return 0;
665 
666 	c->proxy = p;
667 
668 	if (p->reqca != NULL && check_matching_certificate(p->reqca, c))
669 		return 1;
670 
671 	log_debug(c, "opening proxy connection for %s:%s",
672 	    p->host, p->port);
673 
674 	strlcpy(r.host, p->host, sizeof(r.host));
675 	strlcpy(r.port, p->port, sizeof(r.port));
676 
677 	imsg_compose(&exibuf, IMSG_CONN_REQ, c->id, 0, -1, &r, sizeof(r));
678 	imsg_flush(&exibuf);
679 
680 	return 1;
681 }
682 
683 /* 1 if matching `fcgi' (and apply it), 0 otherwise */
684 static int
685 apply_fastcgi(struct client *c)
686 {
687 	int		 id;
688 	struct fcgi	*f;
689 
690 	if ((id = vhost_fastcgi(c->host, c->iri.path)) == -1)
691 		return 0;
692 
693 	f = &fcgi[id];
694 
695 	log_debug(c, "opening fastcgi connection for (%s,%s,%s)",
696 	    f->path, f->port, f->prog);
697 
698 	imsg_compose(&exibuf, IMSG_FCGI_REQ, c->id, 0, -1,
699 	    &id, sizeof(id));
700 	imsg_flush(&exibuf);
701 	return 1;
702 }
703 
704 /* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
705 static int
706 apply_require_ca(struct client *c)
707 {
708 	X509_STORE	*store;
709 
710 	if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
711 		return 0;
712 	return check_matching_certificate(store, c);
713 }
714 
715 static size_t
716 host_nth(struct vhost *h)
717 {
718 	struct vhost	*v;
719 	size_t		 i = 0;
720 
721 	TAILQ_FOREACH(v, &hosts, vhosts) {
722 		if (v == h)
723 			return i;
724 		i++;
725 	}
726 
727 	abort();
728 }
729 
730 static void
731 start_cgi(const char *spath, const char *relpath, struct client *c)
732 {
733 	char addr[NI_MAXHOST];
734 	const char *t;
735 	struct cgireq req;
736 	int e;
737 
738 	c->type = REQUEST_CGI;
739 
740 	e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
741 	    addr, sizeof(addr),
742 	    NULL, 0,
743 	    NI_NUMERICHOST);
744 	if (e != 0)
745 		fatal("getnameinfo failed");
746 
747 	memset(&req, 0, sizeof(req));
748 
749 	memcpy(req.buf, c->req, c->reqlen);
750 
751 	req.iri_schema_off = c->iri.schema - c->req;
752 	req.iri_host_off = c->iri.host - c->req;
753 	req.iri_port_off = c->iri.port - c->req;
754 	req.iri_path_off = c->iri.path - c->req;
755 	req.iri_query_off = c->iri.query - c->req;
756 	req.iri_fragment_off = c->iri.fragment - c->req;
757 
758 	req.iri_portno = c->iri.port_no;
759 
760 	strlcpy(req.spath, spath, sizeof(req.spath));
761 	strlcpy(req.relpath, relpath, sizeof(req.relpath));
762 	strlcpy(req.addr, addr, sizeof(req.addr));
763 
764 	if ((t = tls_peer_cert_subject(c->ctx)) != NULL)
765 		strlcpy(req.subject, t, sizeof(req.subject));
766 	if ((t = tls_peer_cert_issuer(c->ctx)) != NULL)
767 		strlcpy(req.issuer, t, sizeof(req.issuer));
768 	if ((t = tls_peer_cert_hash(c->ctx)) != NULL)
769 		strlcpy(req.hash, t, sizeof(req.hash));
770 	if ((t = tls_conn_version(c->ctx)) != NULL)
771 		strlcpy(req.version, t, sizeof(req.version));
772 	if ((t = tls_conn_cipher(c->ctx)) != NULL)
773 		strlcpy(req.cipher, t, sizeof(req.cipher));
774 
775 	req.cipher_strength = tls_conn_cipher_strength(c->ctx);
776 	req.notbefore = tls_peer_cert_notbefore(c->ctx);
777 	req.notafter = tls_peer_cert_notafter(c->ctx);
778 
779 	req.host_off = host_nth(c->host);
780 	req.loc_off = c->loc;
781 
782 	imsg_compose(&exibuf, IMSG_CGI_REQ, c->id, 0, -1, &req, sizeof(req));
783 	imsg_flush(&exibuf);
784 
785 	close(c->pfd);
786 }
787 
788 static void
789 open_dir(struct client *c)
790 {
791 	size_t len;
792 	int dirfd, root;
793 	char *before_file;
794 
795 	root = !strcmp(c->iri.path, "/") || *c->iri.path == '\0';
796 
797 	len = strlen(c->iri.path);
798 	if (len > 0 && !ends_with(c->iri.path, "/")) {
799 		redirect_canonical_dir(c);
800 		return;
801 	}
802 
803 	strlcpy(c->sbuf, "/", sizeof(c->sbuf));
804 	strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
805 	if (!ends_with(c->sbuf, "/"))
806 		strlcat(c->sbuf, "/", sizeof(c->sbuf));
807 	before_file = strchr(c->sbuf, '\0');
808 	len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
809 	    sizeof(c->sbuf));
810 	if (len >= sizeof(c->sbuf)) {
811 		start_reply(c, TEMP_FAILURE, "internal server error");
812 		return;
813 	}
814 
815 	c->iri.path = c->sbuf;
816 
817 	/* close later unless we have to generate the dir listing */
818 	dirfd = c->pfd;
819 	c->pfd = -1;
820 
821 	switch (check_path(c, c->iri.path, &c->pfd)) {
822 	case FILE_EXECUTABLE:
823 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
824 			start_cgi(c->iri.path, "", c);
825 			break;
826 		}
827 
828 		/* fallthrough */
829 
830 	case FILE_EXISTS:
831 		c->type = REQUEST_FILE;
832 		start_reply(c, SUCCESS, mime(c->host, c->iri.path));
833 		break;
834 
835 	case FILE_DIRECTORY:
836 		start_reply(c, TEMP_REDIRECT, c->sbuf);
837 		break;
838 
839 	case FILE_MISSING:
840 		*before_file = '\0';
841 
842 		if (!vhost_auto_index(c->host, c->iri.path)) {
843 			start_reply(c, NOT_FOUND, "not found");
844 			break;
845 		}
846 
847 		c->type = REQUEST_DIR;
848 
849 		c->dirlen = scandir_fd(dirfd, &c->dir,
850 		    root ? select_non_dotdot : select_non_dot,
851 		    alphasort);
852 		if (c->dirlen == -1) {
853 			log_err(c, "scandir_fd(%d) (vhost:%s) %s: %s",
854 			    c->pfd, c->host->domain, c->iri.path, strerror(errno));
855 			start_reply(c, TEMP_FAILURE, "internal server error");
856 			return;
857 		}
858 		c->diroff = 0;
859 		c->off = 0;
860 
861 		start_reply(c, SUCCESS, "text/gemini");
862 		evbuffer_add_printf(EVBUFFER_OUTPUT(c->bev),
863 		    "# Index of %s\n\n", c->iri.path);
864 		return;
865 
866 	default:
867 		/* unreachable */
868 		abort();
869 	}
870 
871 	close(dirfd);
872 }
873 
874 static void
875 redirect_canonical_dir(struct client *c)
876 {
877 	size_t len;
878 
879 	strlcpy(c->sbuf, "/", sizeof(c->sbuf));
880 	strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
881 	len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
882 
883 	if (len >= sizeof(c->sbuf)) {
884 		start_reply(c, TEMP_FAILURE, "internal server error");
885 		return;
886 	}
887 
888 	start_reply(c, TEMP_REDIRECT, c->sbuf);
889 }
890 
891 static void
892 client_tls_readcb(int fd, short event, void *d)
893 {
894 	struct bufferevent	*bufev = d;
895 	struct client		*client = bufev->cbarg;
896 	ssize_t			 ret;
897 	size_t			 len;
898 	int			 what = EVBUFFER_READ;
899 	int			 howmuch = IBUF_READ_SIZE;
900 	char			 buf[IBUF_READ_SIZE];
901 
902 	if (event == EV_TIMEOUT) {
903 		what |= EVBUFFER_TIMEOUT;
904 		goto err;
905 	}
906 
907 	if (bufev->wm_read.high != 0)
908 		howmuch = MIN(sizeof(buf), bufev->wm_read.high);
909 
910 	switch (ret = tls_read(client->ctx, buf, howmuch)) {
911 	case TLS_WANT_POLLIN:
912 	case TLS_WANT_POLLOUT:
913 		goto retry;
914 	case -1:
915 		what |= EVBUFFER_ERROR;
916 		goto err;
917 	}
918 	len = ret;
919 
920 	if (len == 0) {
921 		what |= EVBUFFER_EOF;
922 		goto err;
923 	}
924 
925 	if (evbuffer_add(bufev->input, buf, len) == -1) {
926 		what |= EVBUFFER_ERROR;
927 		goto err;
928 	}
929 
930 	event_add(&bufev->ev_read, NULL);
931 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
932 		return;
933 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
934 		/*
935 		 * here we could implement a read pressure policy.
936 		 */
937 	}
938 
939 	if (bufev->readcb != NULL)
940 		(*bufev->readcb)(bufev, bufev->cbarg);
941 
942 	return;
943 
944 retry:
945 	event_add(&bufev->ev_read, NULL);
946 	return;
947 
948 err:
949 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
950 }
951 
952 static void
953 client_tls_writecb(int fd, short event, void *d)
954 {
955 	struct bufferevent	*bufev = d;
956 	struct client		*client = bufev->cbarg;
957 	ssize_t			 ret;
958 	size_t			 len;
959 	short			 what = EVBUFFER_WRITE;
960 
961 	if (event == EV_TIMEOUT) {
962 		what |= EVBUFFER_TIMEOUT;
963 		goto err;
964 	}
965 
966 	if (EVBUFFER_LENGTH(bufev->output) != 0) {
967 		ret = tls_write(client->ctx,
968 		    EVBUFFER_DATA(bufev->output),
969 		    EVBUFFER_LENGTH(bufev->output));
970 		switch (ret) {
971 		case TLS_WANT_POLLIN:
972 		case TLS_WANT_POLLOUT:
973 			goto retry;
974 		case -1:
975 			what |= EVBUFFER_ERROR;
976 			goto err;
977 		}
978 		len = ret;
979 		evbuffer_drain(bufev->output, len);
980 	}
981 
982 	if (EVBUFFER_LENGTH(bufev->output) != 0)
983 		event_add(&bufev->ev_write, NULL);
984 
985 	if (bufev->writecb != NULL &&
986 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
987 		(*bufev->writecb)(bufev, bufev->cbarg);
988 	return;
989 
990 retry:
991 	event_add(&bufev->ev_write, NULL);
992 	return;
993 err:
994 	log_err(client, "tls error: %s", tls_error(client->ctx));
995 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
996 }
997 
998 static void
999 client_read(struct bufferevent *bev, void *d)
1000 {
1001 	struct client	*c = d;
1002 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
1003 	const char	*parse_err = "invalid request";
1004 	char		 decoded[DOMAIN_NAME_LEN];
1005 	size_t		 len;
1006 
1007 	bufferevent_disable(bev, EVBUFFER_READ);
1008 
1009 	/*
1010 	 * libevent2 can still somehow call this function, even
1011 	 * though I never enable EV_READ in the bufferevent.  If
1012 	 * that's the case, bail out.
1013 	 */
1014 	if (c->type != REQUEST_UNDECIDED)
1015 		return;
1016 
1017 	/* max url len + \r\n */
1018 	if (EVBUFFER_LENGTH(src) > 1024 + 2) {
1019 		log_err(c, "too much data received");
1020 		start_reply(c, BAD_REQUEST, "bad request");
1021 		return;
1022 	}
1023 
1024 	c->req = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
1025 	if (c->req == NULL) {
1026 		/* not enough data yet. */
1027 		bufferevent_enable(bev, EVBUFFER_READ);
1028 		return;
1029 	}
1030 	c->reqlen = strlen(c->req);
1031 	if (c->reqlen > 1024+2) {
1032 		log_err(c, "URL too long");
1033 		start_reply(c, BAD_REQUEST, "bad request");
1034 		return;
1035 	}
1036 
1037 	if (!parse_iri(c->req, &c->iri, &parse_err) ||
1038 	    !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
1039 		log_err(c, "IRI parse error: %s", parse_err);
1040 		start_reply(c, BAD_REQUEST, "bad request");
1041 		return;
1042 	}
1043 
1044 	if (apply_reverse_proxy(c))
1045 		return;
1046 
1047 	/* ignore the port number */
1048 	if (strcmp(c->iri.schema, "gemini") ||
1049 	    strcmp(decoded, c->domain)) {
1050 		start_reply(c, PROXY_REFUSED, "won't proxy request");
1051 		return;
1052 	}
1053 
1054 	if (apply_require_ca(c) ||
1055 	    apply_block_return(c)||
1056 	    apply_fastcgi(c))
1057 		return;
1058 
1059 	if (c->host->entrypoint != NULL) {
1060 		c->loc = 0;
1061 		start_cgi(c->host->entrypoint, c->iri.path, c);
1062 		return;
1063 	}
1064 
1065 	open_file(c);
1066 }
1067 
1068 void
1069 client_write(struct bufferevent *bev, void *d)
1070 {
1071 	struct client	*c = d;
1072 	struct evbuffer	*out = EVBUFFER_OUTPUT(bev);
1073 	char		 nam[PATH_MAX];
1074 	char		 buf[BUFSIZ];
1075 	ssize_t		 r;
1076 
1077 	switch (c->type) {
1078 	case REQUEST_UNDECIDED:
1079 		/*
1080 		 * Ignore spurious calls when we still don't have idea
1081 		 * what to do with the request.
1082 		 */
1083 		break;
1084 
1085 	case REQUEST_FILE:
1086 		if ((r = read(c->pfd, buf, sizeof(buf))) == -1) {
1087 			log_warn(c, "read: %s", strerror(errno));
1088 			client_error(bev, EVBUFFER_ERROR, c);
1089 			return;
1090 		} else if (r == 0) {
1091 			client_close(c);
1092 			return;
1093 		} else if (r != sizeof(buf))
1094 			c->type = REQUEST_DONE;
1095 		bufferevent_write(bev, buf, r);
1096 		break;
1097 
1098 	case REQUEST_DIR:
1099 		/* TODO: handle big big directories better */
1100 		for (c->diroff = 0; c->diroff < c->dirlen; ++c->diroff) {
1101 			const char *sufx = "";
1102 
1103 			encode_path(nam, sizeof(nam),
1104 			    c->dir[c->diroff]->d_name);
1105 			if (c->dir[c->diroff]->d_type == DT_DIR)
1106 				sufx = "/";
1107 			evbuffer_add_printf(out, "=> ./%s%s\n", nam, sufx);
1108 			free(c->dir[c->diroff]);
1109 		}
1110 		free(c->dir);
1111 		c->dir = NULL;
1112 
1113 		c->type = REQUEST_DONE;
1114 
1115 		event_add(&c->bev->ev_write, NULL);
1116 		break;
1117 
1118 	case REQUEST_CGI:
1119 	case REQUEST_FCGI:
1120 	case REQUEST_PROXY:
1121 		/*
1122 		 * Here we depend on the cgi/fastcgi or proxy
1123 		 * connection to provide data.
1124 		 */
1125 		break;
1126 
1127 	case REQUEST_DONE:
1128 		if (EVBUFFER_LENGTH(out) == 0)
1129 			client_close(c);
1130 		break;
1131 	}
1132 }
1133 
1134 static void
1135 client_error(struct bufferevent *bev, short error, void *d)
1136 {
1137 	struct client	*c = d;
1138 
1139 	c->type = REQUEST_DONE;
1140 
1141 	if (error & EVBUFFER_TIMEOUT) {
1142 		log_warn(c, "timeout reached, "
1143 		    "forcefully closing the connection");
1144 		if (c->code == 0)
1145 			start_reply(c, BAD_REQUEST, "timeout");
1146 		else
1147 			client_close(c);
1148 		return;
1149 	}
1150 
1151 	if (error & EVBUFFER_EOF) {
1152 		client_close(c);
1153 		return;
1154 	}
1155 
1156 	log_err(c, "unknown bufferevent error %x", error);
1157 	client_close(c);
1158 }
1159 
1160 void
1161 start_reply(struct client *c, int code, const char *meta)
1162 {
1163 	struct evbuffer	*evb = EVBUFFER_OUTPUT(c->bev);
1164 	const char	*lang;
1165 	int		 r, rr;
1166 
1167 	bufferevent_enable(c->bev, EVBUFFER_WRITE);
1168 
1169 	c->code = code;
1170 	c->meta = meta;
1171 
1172 	r = evbuffer_add_printf(evb, "%d %s", code, meta);
1173 	if (r == -1)
1174 		goto err;
1175 
1176 	/* 2 digit status + space + 1024 max reply */
1177 	if (r > 1027)
1178 		goto overflow;
1179 
1180 	if (c->type != REQUEST_CGI &&
1181 	    c->type != REQUEST_FCGI &&
1182 	    c->type != REQUEST_PROXY &&
1183 	    !strcmp(meta, "text/gemini") &&
1184 	    (lang = vhost_lang(c->host, c->iri.path)) != NULL) {
1185 		rr = evbuffer_add_printf(evb, ";lang=%s", lang);
1186 		if (rr == -1)
1187 			goto err;
1188 		if (r + rr > 1027)
1189 			goto overflow;
1190 	}
1191 
1192 	bufferevent_write(c->bev, "\r\n", 2);
1193 
1194 	if (!vhost_disable_log(c->host, c->iri.path))
1195 		log_request(c, EVBUFFER_DATA(evb), EVBUFFER_LENGTH(evb));
1196 
1197 	if (code != 20)
1198 		c->type = REQUEST_DONE;
1199 
1200 	return;
1201 
1202 err:
1203 	log_err(c, "evbuffer_add_printf error: no memory");
1204 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1205 	client_close(c);
1206 	return;
1207 
1208 overflow:
1209 	log_warn(c, "reply header overflow");
1210 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1211 	start_reply(c, TEMP_FAILURE, "internal error");
1212 }
1213 
1214 static void
1215 client_close_ev(int fd, short event, void *d)
1216 {
1217 	struct client	*c = d;
1218 
1219 	switch (tls_close(c->ctx)) {
1220 	case TLS_WANT_POLLIN:
1221 		event_once(c->fd, EV_READ, client_close_ev, c, NULL);
1222 		break;
1223 	case TLS_WANT_POLLOUT:
1224 		event_once(c->fd, EV_WRITE, client_close_ev, c, NULL);
1225 		break;
1226 	}
1227 
1228 	connected_clients--;
1229 
1230 	free(c->req);
1231 
1232 	tls_free(c->ctx);
1233 	c->ctx = NULL;
1234 
1235 	free(c->header);
1236 
1237 	if (c->pfd != -1)
1238 		close(c->pfd);
1239 
1240 	if (c->dir != NULL)
1241 		free(c->dir);
1242 
1243 	close(c->fd);
1244 	c->fd = -1;
1245 }
1246 
1247 static void
1248 client_proxy_close(int fd, short event, void *d)
1249 {
1250 	struct tls *ctx = d;
1251 
1252 	if (ctx == NULL) {
1253 		close(fd);
1254 		return;
1255 	}
1256 
1257 	switch (tls_close(ctx)) {
1258 	case TLS_WANT_POLLIN:
1259 		event_once(fd, EV_READ, client_proxy_close, d, NULL);
1260 		break;
1261 	case TLS_WANT_POLLOUT:
1262 		event_once(fd, EV_WRITE, client_proxy_close, d, NULL);
1263 		break;
1264 	}
1265 
1266 	tls_free(ctx);
1267 	close(fd);
1268 }
1269 
1270 void
1271 client_close(struct client *c)
1272 {
1273 	/*
1274 	 * We may end up calling client_close in various situations
1275 	 * and for the most unexpected reasons.  Therefore, we need to
1276 	 * ensure that everything gets properly released once we reach
1277 	 * this point.
1278 	 */
1279 
1280 	SPLAY_REMOVE(client_tree_id, &clients, c);
1281 
1282 	if (c->cgibev != NULL) {
1283 		bufferevent_disable(c->cgibev, EVBUFFER_READ|EVBUFFER_WRITE);
1284 		bufferevent_free(c->cgibev);
1285 		c->cgibev = NULL;
1286 		close(c->pfd);
1287 		c->pfd = -1;
1288 	}
1289 
1290 	bufferevent_disable(c->bev, EVBUFFER_READ|EVBUFFER_WRITE);
1291 	bufferevent_free(c->bev);
1292 	c->bev = NULL;
1293 
1294 	if (c->proxyevset &&
1295 	    event_pending(&c->proxyev, EV_READ|EV_WRITE, NULL)) {
1296 		c->proxyevset = 0;
1297 		event_del(&c->proxyev);
1298 	}
1299 
1300 	if (c->pfd != -1 && c->proxyctx != NULL) {
1301 		/* shut down the proxy TLS connection */
1302 		client_proxy_close(c->pfd, 0, c->proxyctx);
1303 		c->pfd = -1;
1304 	}
1305 
1306 	if (c->proxybev != NULL)
1307 		bufferevent_free(c->proxybev);
1308 
1309 	client_close_ev(c->fd, 0, c);
1310 }
1311 
1312 static void
1313 cgi_read(struct bufferevent *bev, void *d)
1314 {
1315 	struct client	*client = d;
1316 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
1317 	char		*header;
1318 	size_t		 len;
1319 	int		 code;
1320 
1321 	/* intercept the header */
1322 	if (client->code == 0) {
1323 		header = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
1324 		if (header == NULL) {
1325 			/* max reply + \r\n */
1326 			if (EVBUFFER_LENGTH(src) > 1029) {
1327 				log_warn(client, "CGI script is trying to "
1328 				    "send a header too long.");
1329 				cgi_error(bev, EVBUFFER_READ, client);
1330 			}
1331 
1332 			/* wait a bit */
1333 			return;
1334 		}
1335 
1336 		if (len < 3 || len > 1029 ||
1337 		    !isdigit(header[0]) ||
1338 		    !isdigit(header[1]) ||
1339 		    !isspace(header[2])) {
1340 			free(header);
1341 			log_warn(client, "CGI script is trying to send a "
1342 			    "malformed header");
1343 			cgi_error(bev, EVBUFFER_READ, client);
1344 			return;
1345 		}
1346 
1347 		client->header = header;
1348 		code = (header[0] - '0') * 10 + (header[1] - '0');
1349 
1350 		if (code < 10 || code >= 70) {
1351 			log_warn(client, "CGI script is trying to send an "
1352 			    "invalid reply code (%d)", code);
1353 			cgi_error(bev, EVBUFFER_READ, client);
1354 			return;
1355 		}
1356 
1357 		start_reply(client, code, header + 3);
1358 
1359 		if (client->code < 20 || client->code > 29) {
1360 			cgi_error(client->cgibev, EVBUFFER_EOF, client);
1361 			return;
1362 		}
1363 	}
1364 
1365 	bufferevent_write_buffer(client->bev, src);
1366 }
1367 
1368 static void
1369 cgi_write(struct bufferevent *bev, void *d)
1370 {
1371 	/*
1372 	 * Never called.  We don't send data to a CGI script.
1373 	 */
1374 	abort();
1375 }
1376 
1377 static void
1378 cgi_error(struct bufferevent *bev, short error, void *d)
1379 {
1380 	struct client	*client = d;
1381 
1382 	if (error & EVBUFFER_ERROR)
1383 		log_err(client, "%s: evbuffer error (%x): %s",
1384 		    __func__, error, strerror(errno));
1385 
1386 	bufferevent_disable(bev, EVBUFFER_READ|EVBUFFER_WRITE);
1387 	bufferevent_free(bev);
1388 	client->cgibev = NULL;
1389 
1390 	close(client->pfd);
1391 	client->pfd = -1;
1392 
1393 	client->type = REQUEST_DONE;
1394 	if (client->code != 0)
1395 		client_write(client->bev, client);
1396 	else
1397 		start_reply(client, CGI_ERROR, "CGI error");
1398 }
1399 
1400 static void
1401 do_accept(int sock, short et, void *d)
1402 {
1403 	struct client *c;
1404 	struct sockaddr_storage addr;
1405 	struct sockaddr *saddr;
1406 	socklen_t len;
1407 	int fd;
1408 
1409 	saddr = (struct sockaddr*)&addr;
1410 	len = sizeof(addr);
1411 	if ((fd = accept(sock, saddr, &len)) == -1) {
1412 		if (errno == EWOULDBLOCK || errno == EAGAIN ||
1413 		    errno == ECONNABORTED)
1414 			return;
1415 		fatal("accept: %s", strerror(errno));
1416 	}
1417 
1418 	mark_nonblock(fd);
1419 
1420 	c = xcalloc(1, sizeof(*c));
1421 	c->id = ++server_client_id;
1422 	c->fd = fd;
1423 	c->pfd = -1;
1424 	c->addr = addr;
1425 
1426 	if (tls_accept_socket(ctx, &c->ctx, fd) == -1) {
1427 		log_warn(c, "failed to accept socket: %s", tls_error(c->ctx));
1428 		close(c->fd);
1429 		free(c);
1430 		return;
1431 	}
1432 
1433 	SPLAY_INSERT(client_tree_id, &clients, c);
1434 	event_once(c->fd, EV_READ|EV_WRITE, handle_handshake, c, NULL);
1435 	connected_clients++;
1436 }
1437 
1438 struct client *
1439 client_by_id(int id)
1440 {
1441 	struct client find;
1442 
1443 	find.id = id;
1444 	return SPLAY_FIND(client_tree_id, &clients, &find);
1445 }
1446 
1447 static void
1448 handle_imsg_cgi_res(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1449 {
1450 	struct client *c;
1451 
1452 	if ((c = client_by_id(imsg->hdr.peerid)) == NULL) {
1453 		if (imsg->fd != -1)
1454 			close(imsg->fd);
1455 		return;
1456 	}
1457 
1458 	if ((c->pfd = imsg->fd) == -1) {
1459 		start_reply(c, TEMP_FAILURE, "internal server error");
1460 		return;
1461 	}
1462 
1463 	c->type = REQUEST_CGI;
1464 
1465 	c->cgibev = bufferevent_new(c->pfd, cgi_read, cgi_write,
1466 	    cgi_error, c);
1467 
1468 	bufferevent_enable(c->cgibev, EV_READ);
1469 }
1470 
1471 static void
1472 handle_imsg_fcgi_fd(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1473 {
1474 	struct client	*c;
1475 	int		 id;
1476 
1477 	id = imsg->hdr.peerid;
1478 
1479 	if ((c = client_by_id(id)) == NULL) {
1480 		if (imsg->fd != -1)
1481 			close(imsg->fd);
1482 		return;
1483 	}
1484 
1485 	if ((c->pfd = imsg->fd) == -1) {
1486 		start_reply(c, CGI_ERROR, "CGI error");
1487 		return;
1488 	}
1489 
1490 	mark_nonblock(c->pfd);
1491 
1492 	c->cgibev = bufferevent_new(c->pfd, fcgi_read, fcgi_write,
1493 	    fcgi_error, c);
1494 	if (c->cgibev == NULL) {
1495 		start_reply(c, TEMP_FAILURE, "internal server error");
1496 		return;
1497 	}
1498 
1499 	bufferevent_enable(c->cgibev, EV_READ|EV_WRITE);
1500 	fcgi_req(c);
1501 }
1502 
1503 static void
1504 handle_imsg_conn_fd(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1505 {
1506 	struct client	*c;
1507 	int		 id;
1508 
1509 	id = imsg->hdr.peerid;
1510 	if ((c = client_by_id(id)) == NULL) {
1511 		if (imsg->fd != -1)
1512 			close(imsg->fd);
1513 		return;
1514 	}
1515 
1516 	if ((c->pfd = imsg->fd) == -1) {
1517 		start_reply(c, PROXY_ERROR, "proxy error");
1518 		return;
1519 	}
1520 
1521 	mark_nonblock(c->pfd);
1522 
1523 	if (proxy_init(c) == -1)
1524 		start_reply(c, PROXY_ERROR, "proxy error");
1525 }
1526 
1527 static void
1528 handle_imsg_quit(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1529 {
1530 	/*
1531 	 * don't call event_loopbreak since we want to finish to
1532 	 * handle the ongoing connections.
1533 	 */
1534 
1535 	shutting_down = 1;
1536 
1537 	event_del(&e4);
1538 	if (has_ipv6)
1539 		event_del(&e6);
1540 	if (has_siginfo)
1541 		signal_del(&siginfo);
1542 	event_del(&imsgev);
1543 	signal_del(&sigusr2);
1544 }
1545 
1546 static void
1547 handle_dispatch_imsg(int fd, short ev, void *d)
1548 {
1549 	struct imsgbuf *ibuf = d;
1550 	dispatch_imsg(ibuf, handlers, sizeof(handlers));
1551 }
1552 
1553 static void
1554 handle_siginfo(int fd, short ev, void *d)
1555 {
1556 	log_info(NULL, "%d connected clients", connected_clients);
1557 }
1558 
1559 void
1560 loop(struct tls *ctx_, int sock4, int sock6, struct imsgbuf *ibuf)
1561 {
1562 	ctx = ctx_;
1563 
1564 	SPLAY_INIT(&clients);
1565 
1566 	event_init();
1567 
1568 	event_set(&e4, sock4, EV_READ | EV_PERSIST, &do_accept, NULL);
1569 	event_add(&e4, NULL);
1570 
1571 	if (sock6 != -1) {
1572 		has_ipv6 = 1;
1573 		event_set(&e6, sock6, EV_READ | EV_PERSIST, &do_accept, NULL);
1574 		event_add(&e6, NULL);
1575 	}
1576 
1577 	event_set(&imsgev, ibuf->fd, EV_READ | EV_PERSIST, handle_dispatch_imsg, ibuf);
1578 	event_add(&imsgev, NULL);
1579 
1580 #ifdef SIGINFO
1581 	has_siginfo = 1;
1582 	signal_set(&siginfo, SIGINFO, &handle_siginfo, NULL);
1583 	signal_add(&siginfo, NULL);
1584 #endif
1585 	signal_set(&sigusr2, SIGUSR2, &handle_siginfo, NULL);
1586 	signal_add(&sigusr2, NULL);
1587 
1588 	sandbox_server_process();
1589 	event_dispatch();
1590 	_exit(0);
1591 }
1592 
1593 int
1594 client_tree_cmp(struct client *a, struct client *b)
1595 {
1596 	if (a->id == b->id)
1597 		return 0;
1598 	else if (a->id < b->id)
1599 		return -1;
1600 	else
1601 		return +1;
1602 }
1603 
1604 SPLAY_GENERATE(client_tree_id, client, entry, client_tree_cmp)