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Date:: Tue Jan 4 23:15:13 2022 UTC
Message:: add missing prototype
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1 /*
2  * Copyright (c) 2021 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 static struct client *client_by_id(int);
74 
75 static void	 handle_imsg_cgi_res(struct imsgbuf*, struct imsg*, size_t);
76 static void	 handle_imsg_fcgi_fd(struct imsgbuf*, struct imsg*, size_t);
77 static void	 handle_imsg_conn_fd(struct imsgbuf*, struct imsg*, size_t);
78 static void	 handle_imsg_quit(struct imsgbuf*, struct imsg*, size_t);
79 static void	 handle_dispatch_imsg(int, short, void *);
80 static void	 handle_siginfo(int, short, void*);
81 
82 static imsg_handlerfn *handlers[] = {
83 	[IMSG_QUIT] = handle_imsg_quit,
84 	[IMSG_CGI_RES] = handle_imsg_cgi_res,
85 	[IMSG_FCGI_FD] = handle_imsg_fcgi_fd,
86 	[IMSG_CONN_FD] = handle_imsg_conn_fd,
87 };
88 
89 static uint32_t server_client_id;
90 
91 struct client_tree_id clients;
92 
93 static inline int
94 matches(const char *pattern, const char *path)
95 {
96 	if (*path == '/')
97 		path++;
98 	return !fnmatch(pattern, path, 0);
99 }
100 
101 const char *
102 vhost_lang(struct vhost *v, const char *path)
103 {
104 	struct location *loc;
105 
106 	if (v == NULL || path == NULL)
107 		return NULL;
108 
109 	loc = TAILQ_FIRST(&v->locations);
110 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
111 		if (loc->lang != NULL) {
112 			if (matches(loc->match, path))
113 				return loc->lang;
114 		}
115 	}
116 
117 	return TAILQ_FIRST(&v->locations)->lang;
118 }
119 
120 const char *
121 vhost_default_mime(struct vhost *v, const char *path)
122 {
123 	struct location *loc;
124 	const char *default_mime = "application/octet-stream";
125 
126 	if (v == NULL || path == NULL)
127 		return default_mime;
128 
129 	loc = TAILQ_FIRST(&v->locations);
130 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
131 		if (loc->default_mime != NULL) {
132 			if (matches(loc->match, path))
133 				return loc->default_mime;
134 		}
135 	}
136 
137 	loc = TAILQ_FIRST(&v->locations);
138 	if (loc->default_mime != NULL)
139 		return loc->default_mime;
140 	return default_mime;
141 }
142 
143 const char *
144 vhost_index(struct vhost *v, const char *path)
145 {
146 	struct location *loc;
147 	const char *index = "index.gmi";
148 
149 	if (v == NULL || path == NULL)
150 		return index;
151 
152 	loc = TAILQ_FIRST(&v->locations);
153 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
154 		if (loc->index != NULL) {
155 			if (matches(loc->match, path))
156 				return loc->index;
157 		}
158 	}
159 
160 	loc = TAILQ_FIRST(&v->locations);
161 	if (loc->index != NULL)
162 		return loc->index;
163 	return index;
164 }
165 
166 int
167 vhost_auto_index(struct vhost *v, const char *path)
168 {
169 	struct location *loc;
170 
171 	if (v == NULL || path == NULL)
172 		return 0;
173 
174 	loc = TAILQ_FIRST(&v->locations);
175 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
176 		if (loc->auto_index != 0) {
177 			if (matches(loc->match, path))
178 				return loc->auto_index == 1;
179 		}
180 	}
181 
182 	loc = TAILQ_FIRST(&v->locations);
183 	return loc->auto_index == 1;
184 }
185 
186 int
187 vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
188 {
189 	struct location *loc;
190 
191 	if (v == NULL || path == NULL)
192 		return 0;
193 
194 	loc = TAILQ_FIRST(&v->locations);
195 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
196 		if (loc->block_code != 0) {
197 			if (matches(loc->match, path)) {
198 				*code = loc->block_code;
199 				*fmt = loc->block_fmt;
200 				return 1;
201 			}
202 		}
203 	}
204 
205 	loc = TAILQ_FIRST(&v->locations);
206 	*code = loc->block_code;
207 	*fmt = loc->block_fmt;
208 	return loc->block_code != 0;
209 }
210 
211 int
212 vhost_fastcgi(struct vhost *v, const char *path)
213 {
214 	struct location *loc;
215 
216 	if (v == NULL || path == NULL)
217 		return -1;
218 
219 	loc = TAILQ_FIRST(&v->locations);
220 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
221 		if (loc->fcgi != -1)
222 			if (matches(loc->match, path))
223 				return loc->fcgi;
224 	}
225 
226 	loc = TAILQ_FIRST(&v->locations);
227 	return loc->fcgi;
228 }
229 
230 int
231 vhost_dirfd(struct vhost *v, const char *path, size_t *retloc)
232 {
233 	struct location *loc;
234 	size_t		 l = 0;
235 
236 	if (v == NULL || path == NULL)
237 		return -1;
238 
239 	loc = TAILQ_FIRST(&v->locations);
240 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
241 		l++;
242 		if (loc->dirfd != -1)
243 			if (matches(loc->match, path)) {
244 				*retloc = l;
245 				return loc->dirfd;
246 			}
247 	}
248 
249 	*retloc = 0;
250 	loc = TAILQ_FIRST(&v->locations);
251 	return loc->dirfd;
252 }
253 
254 int
255 vhost_strip(struct vhost *v, const char *path)
256 {
257 	struct location *loc;
258 
259 	if (v == NULL || path == NULL)
260 		return 0;
261 
262 	loc = TAILQ_FIRST(&v->locations);
263 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
264 		if (loc->strip != 0) {
265 			if (matches(loc->match, path))
266 				return loc->strip;
267 		}
268 	}
269 
270 	loc = TAILQ_FIRST(&v->locations);
271 	return loc->strip;
272 }
273 
274 X509_STORE *
275 vhost_require_ca(struct vhost *v, const char *path)
276 {
277 	struct location *loc;
278 
279 	if (v == NULL || path == NULL)
280 		return NULL;
281 
282 	loc = TAILQ_FIRST(&v->locations);
283 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
284 		if (loc->reqca != NULL) {
285 			if (matches(loc->match, path))
286 				return loc->reqca;
287 		}
288 	}
289 
290 	loc = TAILQ_FIRST(&v->locations);
291 	return loc->reqca;
292 }
293 
294 int
295 vhost_disable_log(struct vhost *v, const char *path)
296 {
297 	struct location *loc;
298 
299 	if (v == NULL || path == NULL)
300 		return 0;
301 
302 	loc = TAILQ_FIRST(&v->locations);
303 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
304 		if (loc->disable_log && matches(loc->match, path))
305 				return 1;
306 	}
307 
308 	loc = TAILQ_FIRST(&v->locations);
309 	return loc->disable_log;
310 }
311 
312 static int
313 check_path(struct client *c, const char *path, int *fd)
314 {
315 	struct stat sb;
316 	const char *p;
317 	int dirfd, strip;
318 
319 	assert(path != NULL);
320 
321 	/*
322 	 * in send_dir we add an initial / (to be redirect-friendly),
323 	 * but here we want to skip it
324 	 */
325 	if (*path == '/')
326 		path++;
327 
328 	strip = vhost_strip(c->host, path);
329 	p = strip_path(path, strip);
330 
331 	if (*p == '/')
332 		p = p+1;
333 	if (*p == '\0')
334 		p = ".";
335 
336 	dirfd = vhost_dirfd(c->host, path, &c->loc);
337 	log_debug(c, "check_path: strip=%d path=%s original=%s",
338 	    strip, p, path);
339 	if (*fd == -1 && (*fd = openat(dirfd, p, O_RDONLY)) == -1)
340 		return FILE_MISSING;
341 
342 	if (fstat(*fd, &sb) == -1) {
343 		log_notice(c, "failed stat for %s: %s", path, strerror(errno));
344 		return FILE_MISSING;
345 	}
346 
347 	if (S_ISDIR(sb.st_mode))
348 		return FILE_DIRECTORY;
349 
350 	if (sb.st_mode & S_IXUSR)
351 		return FILE_EXECUTABLE;
352 
353 	return FILE_EXISTS;
354 }
355 
356 static void
357 open_file(struct client *c)
358 {
359 	switch (check_path(c, c->iri.path, &c->pfd)) {
360 	case FILE_EXECUTABLE:
361 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
362 			start_cgi(c->iri.path, "", c);
363 			return;
364 		}
365 
366 		/* fallthrough */
367 
368 	case FILE_EXISTS:
369 		c->type = REQUEST_FILE;
370 		start_reply(c, SUCCESS, mime(c->host, c->iri.path));
371 		return;
372 
373 	case FILE_DIRECTORY:
374 		open_dir(c);
375 		return;
376 
377 	case FILE_MISSING:
378 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
379 			check_for_cgi(c);
380 			return;
381 		}
382 		start_reply(c, NOT_FOUND, "not found");
383 		return;
384 
385 	default:
386 		/* unreachable */
387 		abort();
388 	}
389 }
390 
391 /*
392  * the inverse of this algorithm, i.e. starting from the start of the
393  * path + strlen(cgi), and checking if each component, should be
394  * faster.  But it's tedious to write.  This does the opposite: starts
395  * from the end and strip one component at a time, until either an
396  * executable is found or we emptied the path.
397  */
398 static void
399 check_for_cgi(struct client *c)
400 {
401 	char path[PATH_MAX];
402 	char *end;
403 
404 	strlcpy(path, c->iri.path, sizeof(path));
405 	end = strchr(path, '\0');
406 
407 	while (end > path) {
408 		/*
409 		 * go up one level.  UNIX paths are simple and POSIX
410 		 * dirname, with its ambiguities on if the given
411 		 * pointer is changed or not, gives me headaches.
412 		 */
413 		while (*end != '/' && end > path)
414 			end--;
415 
416 		if (end == path)
417 			break;
418 
419 		*end = '\0';
420 
421 		switch (check_path(c, path, &c->pfd)) {
422 		case FILE_EXECUTABLE:
423 			start_cgi(path, end+1, c);
424 			return;
425 		case FILE_MISSING:
426 			break;
427 		default:
428 			goto err;
429 		}
430 
431 		*end = '/';
432 		end--;
433 	}
434 
435 err:
436 	start_reply(c, NOT_FOUND, "not found");
437 	return;
438 }
439 
440 void
441 mark_nonblock(int fd)
442 {
443 	int flags;
444 
445 	if ((flags = fcntl(fd, F_GETFL)) == -1)
446 		fatal("fcntl(F_GETFL): %s", strerror(errno));
447 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
448 		fatal("fcntl(F_SETFL): %s", strerror(errno));
449 }
450 
451 static void
452 handle_handshake(int fd, short ev, void *d)
453 {
454 	struct client *c = d;
455 	struct vhost *h;
456 	struct alist *a;
457 	const char *servname;
458 	const char *parse_err = "unknown error";
459 
460 	switch (tls_handshake(c->ctx)) {
461 	case 0:  /* success */
462 	case -1: /* already handshaked */
463 		break;
464 	case TLS_WANT_POLLIN:
465 		event_once(c->fd, EV_READ, handle_handshake, c, NULL);
466 		return;
467 	case TLS_WANT_POLLOUT:
468 		event_once(c->fd, EV_WRITE, handle_handshake, c, NULL);
469 		return;
470 	default:
471 		/* unreachable */
472 		abort();
473 	}
474 
475 	c->bev = bufferevent_new(fd, client_read, client_write,
476 	    client_error, c);
477 	if (c->bev == NULL)
478 		fatal("%s: failed to allocate client buffer: %s",
479 		    __func__, strerror(errno));
480 
481 	event_set(&c->bev->ev_read, c->fd, EV_READ,
482 	    client_tls_readcb, c->bev);
483 	event_set(&c->bev->ev_write, c->fd, EV_WRITE,
484 	    client_tls_writecb, c->bev);
485 
486 #if HAVE_LIBEVENT2
487 	evbuffer_unfreeze(c->bev->input, 0);
488 	evbuffer_unfreeze(c->bev->output, 1);
489 #endif
490 
491 	if ((servname = tls_conn_servername(c->ctx)) == NULL) {
492 		log_debug(c, "handshake: missing SNI");
493 		goto err;
494 	}
495 
496 	if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
497 		log_info(c, "puny_decode: %s", parse_err);
498 		goto err;
499 	}
500 
501 	TAILQ_FOREACH(h, &hosts, vhosts) {
502 		if (matches(h->domain, c->domain))
503 			goto found;
504 		TAILQ_FOREACH(a, &h->aliases, aliases) {
505 			if (matches(a->alias, c->domain))
506 				goto found;
507 		}
508 	}
509 
510 found:
511 	log_debug(c, "handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
512 	    servname != NULL ? servname : "(null)",
513 	    c->domain,
514 	    h != NULL ? h->domain : "(null)");
515 
516 	if (h != NULL) {
517 		c->host = h;
518 		bufferevent_enable(c->bev, EV_READ);
519 		return;
520 	}
521 
522 err:
523 	start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
524 }
525 
526 static const char *
527 strip_path(const char *path, int strip)
528 {
529 	char *t;
530 
531 	while (strip > 0) {
532 		if ((t = strchr(path, '/')) == NULL) {
533 			path = strchr(path, '\0');
534 			break;
535 		}
536 		path = t;
537 		strip--;
538 	}
539 
540 	return path;
541 }
542 
543 static void
544 fmt_sbuf(const char *fmt, struct client *c, const char *path)
545 {
546 	size_t i;
547 	char buf[32];
548 
549 	memset(buf, 0, sizeof(buf));
550 	for (i = 0; *fmt; ++fmt) {
551 		if (i == sizeof(buf)-1 || *fmt == '%') {
552 			strlcat(c->sbuf, buf, sizeof(c->sbuf));
553 			memset(buf, 0, sizeof(buf));
554 			i = 0;
555 		}
556 
557 		if (*fmt != '%') {
558 			buf[i++] = *fmt;
559 			continue;
560 		}
561 
562 		switch (*++fmt) {
563 		case '%':
564 			strlcat(c->sbuf, "%", sizeof(c->sbuf));
565 			break;
566 		case 'p':
567 			if (*path != '/')
568 				strlcat(c->sbuf, "/", sizeof(c->sbuf));
569 			strlcat(c->sbuf, path, sizeof(c->sbuf));
570 			break;
571 		case 'q':
572 			strlcat(c->sbuf, c->iri.query, sizeof(c->sbuf));
573 			break;
574 		case 'P':
575 			snprintf(buf, sizeof(buf), "%d", conf.port);
576 			strlcat(c->sbuf, buf, sizeof(c->sbuf));
577 			memset(buf, 0, sizeof(buf));
578 			break;
579 		case 'N':
580 			strlcat(c->sbuf, c->domain, sizeof(c->sbuf));
581 			break;
582 		default:
583 			fatal("%s: unknown fmt specifier %c",
584 			    __func__, *fmt);
585 		}
586 	}
587 
588 	if (i != 0)
589 		strlcat(c->sbuf, buf, sizeof(c->sbuf));
590 }
591 
592 /* 1 if a matching `block return' (and apply it), 0 otherwise */
593 static int
594 apply_block_return(struct client *c)
595 {
596 	const char *fmt, *path;
597 	int code;
598 
599 	if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
600 		return 0;
601 
602 	path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
603 	fmt_sbuf(fmt, c, path);
604 
605 	start_reply(c, code, c->sbuf);
606 	return 1;
607 }
608 
609 static struct proxy *
610 matched_proxy(struct client *c)
611 {
612 	struct proxy	*p;
613 	const char	*proto;
614 	const char	*host;
615 	const char	*port;
616 
617 	TAILQ_FOREACH(p, &c->host->proxies, proxies) {
618 		if ((proto = p->match_proto) == NULL)
619 			proto = "gemini";
620 		if ((host = p->match_host) == NULL)
621 			host = "*";
622 		if ((port = p->match_port) == NULL)
623 			port = "*";
624 
625 		if (matches(proto, c->iri.schema) &&
626 		    matches(host, c->domain) &&
627 		    matches(port, c->iri.port))
628 			return p;
629 	}
630 
631 	return NULL;
632 }
633 
634 static int
635 check_matching_certificate(X509_STORE *store, struct client *c)
636 {
637 	const uint8_t	*cert;
638 	size_t		 len;
639 
640 	if (!tls_peer_cert_provided(c->ctx)) {
641 		start_reply(c, CLIENT_CERT_REQ, "client certificate required");
642 		return 1;
643 	}
644 
645 	cert = tls_peer_cert_chain_pem(c->ctx, &len);
646 	if (!validate_against_ca(store, cert, len)) {
647 		start_reply(c, CERT_NOT_AUTH, "certificate not authorised");
648 		return 1;
649 	}
650 
651 	return 0;
652 }
653 
654 /* 1 if matching a proxy relay-to (and apply it), 0 otherwise */
655 static int
656 apply_reverse_proxy(struct client *c)
657 {
658 	struct proxy	*p;
659 	struct connreq	 r;
660 
661 	if ((p = matched_proxy(c)) == NULL)
662 		return 0;
663 
664 	c->proxy = p;
665 
666 	if (p->reqca != NULL && check_matching_certificate(p->reqca, c))
667 		return 1;
668 
669 	log_debug(c, "opening proxy connection for %s:%s",
670 	    p->host, p->port);
671 
672 	strlcpy(r.host, p->host, sizeof(r.host));
673 	strlcpy(r.port, p->port, sizeof(r.port));
674 
675 	imsg_compose(&exibuf, IMSG_CONN_REQ, c->id, 0, -1, &r, sizeof(r));
676 	imsg_flush(&exibuf);
677 
678 	return 1;
679 }
680 
681 /* 1 if matching `fcgi' (and apply it), 0 otherwise */
682 static int
683 apply_fastcgi(struct client *c)
684 {
685 	int		 id;
686 	struct fcgi	*f;
687 
688 	if ((id = vhost_fastcgi(c->host, c->iri.path)) == -1)
689 		return 0;
690 
691 	f = &fcgi[id];
692 
693 	log_debug(c, "opening fastcgi connection for (%s,%s,%s)",
694 	    f->path, f->port, f->prog);
695 
696 	imsg_compose(&exibuf, IMSG_FCGI_REQ, c->id, 0, -1,
697 	    &id, sizeof(id));
698 	imsg_flush(&exibuf);
699 	return 1;
700 }
701 
702 /* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
703 static int
704 apply_require_ca(struct client *c)
705 {
706 	X509_STORE	*store;
707 
708 	if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
709 		return 0;
710 	return check_matching_certificate(store, c);
711 }
712 
713 static size_t
714 host_nth(struct vhost *h)
715 {
716 	struct vhost	*v;
717 	size_t		 i = 0;
718 
719 	TAILQ_FOREACH(v, &hosts, vhosts) {
720 		if (v == h)
721 			return i;
722 		i++;
723 	}
724 
725 	abort();
726 }
727 
728 static void
729 start_cgi(const char *spath, const char *relpath, struct client *c)
730 {
731 	char addr[NI_MAXHOST];
732 	const char *t;
733 	struct cgireq req;
734 	int e;
735 
736 	c->type = REQUEST_CGI;
737 
738 	e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
739 	    addr, sizeof(addr),
740 	    NULL, 0,
741 	    NI_NUMERICHOST);
742 	if (e != 0)
743 		fatal("getnameinfo failed");
744 
745 	memset(&req, 0, sizeof(req));
746 
747 	memcpy(req.buf, c->req, sizeof(req.buf));
748 
749 	req.iri_schema_off = c->iri.schema - c->req;
750 	req.iri_host_off = c->iri.host - c->req;
751 	req.iri_port_off = c->iri.port - c->req;
752 	req.iri_path_off = c->iri.path - c->req;
753 	req.iri_query_off = c->iri.query - c->req;
754 	req.iri_fragment_off = c->iri.fragment - c->req;
755 
756 	req.iri_portno = c->iri.port_no;
757 
758 	strlcpy(req.spath, spath, sizeof(req.spath));
759 	strlcpy(req.relpath, relpath, sizeof(req.relpath));
760 	strlcpy(req.addr, addr, sizeof(req.addr));
761 
762 	if ((t = tls_peer_cert_subject(c->ctx)) != NULL)
763 		strlcpy(req.subject, t, sizeof(req.subject));
764 	if ((t = tls_peer_cert_issuer(c->ctx)) != NULL)
765 		strlcpy(req.issuer, t, sizeof(req.issuer));
766 	if ((t = tls_peer_cert_hash(c->ctx)) != NULL)
767 		strlcpy(req.hash, t, sizeof(req.hash));
768 	if ((t = tls_conn_version(c->ctx)) != NULL)
769 		strlcpy(req.version, t, sizeof(req.version));
770 	if ((t = tls_conn_cipher(c->ctx)) != NULL)
771 		strlcpy(req.cipher, t, sizeof(req.cipher));
772 
773 	req.cipher_strength = tls_conn_cipher_strength(c->ctx);
774 	req.notbefore = tls_peer_cert_notbefore(c->ctx);
775 	req.notafter = tls_peer_cert_notafter(c->ctx);
776 
777 	req.host_off = host_nth(c->host);
778 	req.loc_off = c->loc;
779 
780 	imsg_compose(&exibuf, IMSG_CGI_REQ, c->id, 0, -1, &req, sizeof(req));
781 	imsg_flush(&exibuf);
782 
783 	close(c->pfd);
784 }
785 
786 static void
787 open_dir(struct client *c)
788 {
789 	size_t len;
790 	int dirfd, root;
791 	char *before_file;
792 
793 	root = !strcmp(c->iri.path, "/") || *c->iri.path == '\0';
794 
795 	len = strlen(c->iri.path);
796 	if (len > 0 && !ends_with(c->iri.path, "/")) {
797 		redirect_canonical_dir(c);
798 		return;
799 	}
800 
801 	strlcpy(c->sbuf, "/", sizeof(c->sbuf));
802 	strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
803 	if (!ends_with(c->sbuf, "/"))
804 		strlcat(c->sbuf, "/", sizeof(c->sbuf));
805 	before_file = strchr(c->sbuf, '\0');
806 	len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
807 	    sizeof(c->sbuf));
808 	if (len >= sizeof(c->sbuf)) {
809 		start_reply(c, TEMP_FAILURE, "internal server error");
810 		return;
811 	}
812 
813 	c->iri.path = c->sbuf;
814 
815 	/* close later unless we have to generate the dir listing */
816 	dirfd = c->pfd;
817 	c->pfd = -1;
818 
819 	switch (check_path(c, c->iri.path, &c->pfd)) {
820 	case FILE_EXECUTABLE:
821 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
822 			start_cgi(c->iri.path, "", c);
823 			break;
824 		}
825 
826 		/* fallthrough */
827 
828 	case FILE_EXISTS:
829 		c->type = REQUEST_FILE;
830 		start_reply(c, SUCCESS, mime(c->host, c->iri.path));
831 		break;
832 
833 	case FILE_DIRECTORY:
834 		start_reply(c, TEMP_REDIRECT, c->sbuf);
835 		break;
836 
837 	case FILE_MISSING:
838 		*before_file = '\0';
839 
840 		if (!vhost_auto_index(c->host, c->iri.path)) {
841 			start_reply(c, NOT_FOUND, "not found");
842 			break;
843 		}
844 
845 		c->type = REQUEST_DIR;
846 
847 		c->dirlen = scandir_fd(dirfd, &c->dir,
848 		    root ? select_non_dotdot : select_non_dot,
849 		    alphasort);
850 		if (c->dirlen == -1) {
851 			log_err(c, "scandir_fd(%d) (vhost:%s) %s: %s",
852 			    c->pfd, c->host->domain, c->iri.path, strerror(errno));
853 			start_reply(c, TEMP_FAILURE, "internal server error");
854 			return;
855 		}
856 		c->diroff = 0;
857 		c->off = 0;
858 
859 		start_reply(c, SUCCESS, "text/gemini");
860 		evbuffer_add_printf(EVBUFFER_OUTPUT(c->bev),
861 		    "# Index of %s\n\n", c->iri.path);
862 		return;
863 
864 	default:
865 		/* unreachable */
866 		abort();
867 	}
868 
869 	close(dirfd);
870 }
871 
872 static void
873 redirect_canonical_dir(struct client *c)
874 {
875 	size_t len;
876 
877 	strlcpy(c->sbuf, "/", sizeof(c->sbuf));
878 	strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
879 	len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
880 
881 	if (len >= sizeof(c->sbuf)) {
882 		start_reply(c, TEMP_FAILURE, "internal server error");
883 		return;
884 	}
885 
886 	start_reply(c, TEMP_REDIRECT, c->sbuf);
887 }
888 
889 static void
890 client_tls_readcb(int fd, short event, void *d)
891 {
892 	struct bufferevent	*bufev = d;
893 	struct client		*client = bufev->cbarg;
894 	ssize_t			 ret;
895 	size_t			 len;
896 	int			 what = EVBUFFER_READ;
897 	int			 howmuch = IBUF_READ_SIZE;
898 	char			 buf[IBUF_READ_SIZE];
899 
900 	if (event == EV_TIMEOUT) {
901 		what |= EVBUFFER_TIMEOUT;
902 		goto err;
903 	}
904 
905 	if (bufev->wm_read.high != 0)
906 		howmuch = MIN(sizeof(buf), bufev->wm_read.high);
907 
908 	switch (ret = tls_read(client->ctx, buf, howmuch)) {
909 	case TLS_WANT_POLLIN:
910 	case TLS_WANT_POLLOUT:
911 		goto retry;
912 	case -1:
913 		what |= EVBUFFER_ERROR;
914 		goto err;
915 	}
916 	len = ret;
917 
918 	if (len == 0) {
919 		what |= EVBUFFER_EOF;
920 		goto err;
921 	}
922 
923 	if (evbuffer_add(bufev->input, buf, len) == -1) {
924 		what |= EVBUFFER_ERROR;
925 		goto err;
926 	}
927 
928 	event_add(&bufev->ev_read, NULL);
929 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
930 		return;
931 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
932 		/*
933 		 * here we could implement a read pressure policy.
934 		 */
935 	}
936 
937 	if (bufev->readcb != NULL)
938 		(*bufev->readcb)(bufev, bufev->cbarg);
939 
940 	return;
941 
942 retry:
943 	event_add(&bufev->ev_read, NULL);
944 	return;
945 
946 err:
947 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
948 }
949 
950 static void
951 client_tls_writecb(int fd, short event, void *d)
952 {
953 	struct bufferevent	*bufev = d;
954 	struct client		*client = bufev->cbarg;
955 	ssize_t			 ret;
956 	size_t			 len;
957 	short			 what = EVBUFFER_WRITE;
958 
959 	if (event == EV_TIMEOUT) {
960 		what |= EVBUFFER_TIMEOUT;
961 		goto err;
962 	}
963 
964 	if (EVBUFFER_LENGTH(bufev->output) != 0) {
965 		ret = tls_write(client->ctx,
966 		    EVBUFFER_DATA(bufev->output),
967 		    EVBUFFER_LENGTH(bufev->output));
968 		switch (ret) {
969 		case TLS_WANT_POLLIN:
970 		case TLS_WANT_POLLOUT:
971 			goto retry;
972 		case -1:
973 			what |= EVBUFFER_ERROR;
974 			goto err;
975 		}
976 		len = ret;
977 		evbuffer_drain(bufev->output, len);
978 	}
979 
980 	if (EVBUFFER_LENGTH(bufev->output) != 0)
981 		event_add(&bufev->ev_write, NULL);
982 
983 	if (bufev->writecb != NULL &&
984 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
985 		(*bufev->writecb)(bufev, bufev->cbarg);
986 	return;
987 
988 retry:
989 	event_add(&bufev->ev_write, NULL);
990 	return;
991 err:
992 	log_err(client, "tls error: %s", tls_error(client->ctx));
993 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
994 }
995 
996 static void
997 client_read(struct bufferevent *bev, void *d)
998 {
999 	struct client	*c = d;
1000 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
1001 	const char	*parse_err = "invalid request";
1002 	char		 decoded[DOMAIN_NAME_LEN];
1003 	size_t		 len;
1004 
1005 	bufferevent_disable(bev, EVBUFFER_READ);
1006 
1007 	/* max url len + \r\n */
1008 	if (EVBUFFER_LENGTH(src) > 1024 + 2) {
1009 		log_err(c, "too much data received");
1010 		start_reply(c, BAD_REQUEST, "bad request");
1011 		return;
1012 	}
1013 
1014 	c->req = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
1015 	if (c->req == NULL) {
1016 		/* not enough data yet. */
1017 		bufferevent_enable(bev, EVBUFFER_READ);
1018 		return;
1019 	}
1020 
1021 	if (!parse_iri(c->req, &c->iri, &parse_err) ||
1022 	    !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
1023 		log_err(c, "IRI parse error: %s", parse_err);
1024 		start_reply(c, BAD_REQUEST, "bad request");
1025 		return;
1026 	}
1027 
1028 	if (apply_reverse_proxy(c))
1029 		return;
1030 
1031 	/* ignore the port number */
1032 	if (strcmp(c->iri.schema, "gemini") ||
1033 	    strcmp(decoded, c->domain)) {
1034 		start_reply(c, PROXY_REFUSED, "won't proxy request");
1035 		return;
1036 	}
1037 
1038 	if (apply_require_ca(c) ||
1039 	    apply_block_return(c)||
1040 	    apply_fastcgi(c))
1041 		return;
1042 
1043 	if (c->host->entrypoint != NULL) {
1044 		c->loc = 0;
1045 		start_cgi(c->host->entrypoint, c->iri.path, c);
1046 		return;
1047 	}
1048 
1049 	open_file(c);
1050 }
1051 
1052 void
1053 client_write(struct bufferevent *bev, void *d)
1054 {
1055 	struct client	*c = d;
1056 	struct evbuffer	*out = EVBUFFER_OUTPUT(bev);
1057 	char		 buf[BUFSIZ];
1058 	ssize_t		 r;
1059 
1060 	switch (c->type) {
1061 	case REQUEST_UNDECIDED:
1062 		/*
1063 		 * Ignore spurious calls when we still don't have idea
1064 		 * what to do with the request.
1065 		 */
1066 		break;
1067 
1068 	case REQUEST_FILE:
1069 		if ((r = read(c->pfd, buf, sizeof(buf))) == -1) {
1070 			log_warn(c, "read: %s", strerror(errno));
1071 			client_error(bev, EVBUFFER_ERROR, c);
1072 			return;
1073 		} else if (r == 0) {
1074 			client_close(c);
1075 			return;
1076 		} else if (r != sizeof(buf))
1077 			c->type = REQUEST_DONE;
1078 		bufferevent_write(bev, buf, r);
1079 		break;
1080 
1081 	case REQUEST_DIR:
1082 		/* TODO: handle big big directories better */
1083 		for (c->diroff = 0; c->diroff < c->dirlen; ++c->diroff) {
1084 			evbuffer_add_printf(out, "=> %s\n",
1085 			    c->dir[c->diroff]->d_name);
1086 			free(c->dir[c->diroff]);
1087 		}
1088 		free(c->dir);
1089 		c->dir = NULL;
1090 
1091 		c->type = REQUEST_DONE;
1092 
1093 		event_add(&c->bev->ev_write, NULL);
1094 		break;
1095 
1096 	case REQUEST_CGI:
1097 	case REQUEST_FCGI:
1098 	case REQUEST_PROXY:
1099 		/*
1100 		 *  Here we depend on on the cgi script or fastcgi
1101 		 *  connection to provide data.
1102 		 */
1103 		break;
1104 
1105 	case REQUEST_DONE:
1106 		if (EVBUFFER_LENGTH(out) == 0)
1107 			client_close(c);
1108 		break;
1109 	}
1110 }
1111 
1112 static void
1113 client_error(struct bufferevent *bev, short error, void *d)
1114 {
1115 	struct client	*c = d;
1116 
1117 	c->type = REQUEST_DONE;
1118 
1119 	if (error & EVBUFFER_TIMEOUT) {
1120 		log_warn(c, "timeout reached, "
1121 		    "forcefully closing the connection");
1122 		if (c->code == 0)
1123 			start_reply(c, BAD_REQUEST, "timeout");
1124 		else
1125 			client_close(c);
1126 		return;
1127 	}
1128 
1129 	if (error & EVBUFFER_EOF) {
1130 		client_close(c);
1131 		return;
1132 	}
1133 
1134 	log_err(c, "unknown bufferevent error: %s", strerror(errno));
1135 	client_close(c);
1136 }
1137 
1138 void
1139 start_reply(struct client *c, int code, const char *meta)
1140 {
1141 	struct evbuffer	*evb = EVBUFFER_OUTPUT(c->bev);
1142 	const char	*lang;
1143 	int		 r, rr;
1144 
1145 	bufferevent_enable(c->bev, EVBUFFER_WRITE);
1146 
1147 	c->code = code;
1148 	c->meta = meta;
1149 
1150 	r = evbuffer_add_printf(evb, "%d %s", code, meta);
1151 	if (r == -1)
1152 		goto err;
1153 
1154 	/* 2 digit status + space + 1024 max reply */
1155 	if (r > 1027)
1156 		goto overflow;
1157 
1158 	if (c->type != REQUEST_CGI &&
1159 	    c->type != REQUEST_FCGI &&
1160 	    c->type != REQUEST_PROXY &&
1161 	    !strcmp(meta, "text/gemini") &&
1162 	    (lang = vhost_lang(c->host, c->iri.path)) != NULL) {
1163 		rr = evbuffer_add_printf(evb, ";lang=%s", lang);
1164 		if (rr == -1)
1165 			goto err;
1166 		if (r + rr > 1027)
1167 			goto overflow;
1168 	}
1169 
1170 	bufferevent_write(c->bev, "\r\n", 2);
1171 
1172 	if (!vhost_disable_log(c->host, c->iri.path))
1173 		log_request(c, EVBUFFER_DATA(evb), EVBUFFER_LENGTH(evb));
1174 
1175 	if (code != 20 && IS_INTERNAL_REQUEST(c->type))
1176 		c->type = REQUEST_DONE;
1177 
1178 	return;
1179 
1180 err:
1181 	log_err(c, "evbuffer_add_printf error: no memory");
1182 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1183 	client_close(c);
1184 	return;
1185 
1186 overflow:
1187 	log_warn(c, "reply header overflow");
1188 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1189 	start_reply(c, TEMP_FAILURE, "internal error");
1190 }
1191 
1192 static void
1193 client_close_ev(int fd, short event, void *d)
1194 {
1195 	struct client	*c = d;
1196 
1197 	switch (tls_close(c->ctx)) {
1198 	case TLS_WANT_POLLIN:
1199 		event_once(c->fd, EV_READ, client_close_ev, c, NULL);
1200 		break;
1201 	case TLS_WANT_POLLOUT:
1202 		event_once(c->fd, EV_WRITE, client_close_ev, c, NULL);
1203 		break;
1204 	}
1205 
1206 	connected_clients--;
1207 
1208 	free(c->req);
1209 
1210 	tls_free(c->ctx);
1211 	c->ctx = NULL;
1212 
1213 	free(c->header);
1214 
1215 	if (c->pfd != -1)
1216 		close(c->pfd);
1217 
1218 	if (c->dir != NULL)
1219 		free(c->dir);
1220 
1221 	close(c->fd);
1222 	c->fd = -1;
1223 }
1224 
1225 static void
1226 client_proxy_close(int fd, short event, void *d)
1227 {
1228 	struct tls *ctx = d;
1229 
1230 	if (ctx == NULL) {
1231 		close(fd);
1232 		return;
1233 	}
1234 
1235 	switch (tls_close(ctx)) {
1236 	case TLS_WANT_POLLIN:
1237 		event_once(fd, EV_READ, client_proxy_close, d, NULL);
1238 		break;
1239 	case TLS_WANT_POLLOUT:
1240 		event_once(fd, EV_WRITE, client_proxy_close, d, NULL);
1241 		break;
1242 	}
1243 
1244 	tls_free(ctx);
1245 	close(fd);
1246 }
1247 
1248 void
1249 client_close(struct client *c)
1250 {
1251 	/*
1252 	 * We may end up calling client_close in various situations
1253 	 * and for the most unexpected reasons.  Therefore, we need to
1254 	 * ensure that everything is properly released once we reach
1255 	 * this point.
1256 	 */
1257 
1258 	SPLAY_REMOVE(client_tree_id, &clients, c);
1259 
1260 	if (c->cgibev != NULL) {
1261 		bufferevent_disable(c->cgibev, EVBUFFER_READ|EVBUFFER_WRITE);
1262 		bufferevent_free(c->cgibev);
1263 		c->cgibev = NULL;
1264 		close(c->pfd);
1265 		c->pfd = -1;
1266 	}
1267 
1268 	bufferevent_disable(c->bev, EVBUFFER_READ|EVBUFFER_WRITE);
1269 	bufferevent_free(c->bev);
1270 	c->bev = NULL;
1271 
1272 	if (c->proxybev != NULL) {
1273 		if (event_pending(&c->proxyev, EV_READ|EV_WRITE, NULL))
1274 			event_del(&c->proxyev);
1275 
1276 		if (c->pfd != -1 && c->proxyctx != NULL) {
1277 			/* shut down the proxy TLS connection */
1278 			client_proxy_close(c->pfd, 0, c->proxyctx);
1279 			c->pfd = -1;
1280 		}
1281 
1282 		bufferevent_free(c->proxybev);
1283 	}
1284 
1285 	client_close_ev(c->fd, 0, c);
1286 }
1287 
1288 static void
1289 cgi_read(struct bufferevent *bev, void *d)
1290 {
1291 	struct client	*client = d;
1292 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
1293 	char		*header;
1294 	size_t		 len;
1295 	int		 code;
1296 
1297 	/* intercept the header */
1298 	if (client->code == 0) {
1299 		header = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
1300 		if (header == NULL) {
1301 			/* max reply + \r\n */
1302 			if (EVBUFFER_LENGTH(src) > 1029) {
1303 				log_warn(client, "CGI script is trying to "
1304 				    "send a header too long.");
1305 				cgi_error(bev, EVBUFFER_READ, client);
1306 			}
1307 
1308 			/* wait a bit */
1309 			return;
1310 		}
1311 
1312 		if (len < 3 || len > 1029 ||
1313 		    !isdigit(header[0]) ||
1314 		    !isdigit(header[1]) ||
1315 		    !isspace(header[2])) {
1316 			free(header);
1317 			log_warn(client, "CGI script is trying to send a "
1318 			    "malformed header");
1319 			cgi_error(bev, EVBUFFER_READ, client);
1320 			return;
1321 		}
1322 
1323 		client->header = header;
1324 		code = (header[0] - '0') * 10 + (header[1] - '0');
1325 
1326 		if (code < 10 || code >= 70) {
1327 			log_warn(client, "CGI script is trying to send an "
1328 			    "invalid reply code (%d)", code);
1329 			cgi_error(bev, EVBUFFER_READ, client);
1330 			return;
1331 		}
1332 
1333 		start_reply(client, code, header + 3);
1334 
1335 		if (client->code < 20 || client->code > 29) {
1336 			cgi_error(client->cgibev, EVBUFFER_EOF, client);
1337 			return;
1338 		}
1339 	}
1340 
1341 	bufferevent_write_buffer(client->bev, src);
1342 }
1343 
1344 static void
1345 cgi_write(struct bufferevent *bev, void *d)
1346 {
1347 	/*
1348 	 * Never called.  We don't send data to a CGI script.
1349 	 */
1350 	abort();
1351 }
1352 
1353 static void
1354 cgi_error(struct bufferevent *bev, short error, void *d)
1355 {
1356 	struct client	*client = d;
1357 
1358 	if (error & EVBUFFER_ERROR)
1359 		log_err(client, "%s: evbuffer error (%x): %s",
1360 		    __func__, error, strerror(errno));
1361 
1362 	bufferevent_disable(bev, EVBUFFER_READ|EVBUFFER_WRITE);
1363 	bufferevent_free(bev);
1364 	client->cgibev = NULL;
1365 
1366 	close(client->pfd);
1367 	client->pfd = -1;
1368 
1369 	client->type = REQUEST_DONE;
1370 	if (client->code != 0)
1371 		client_write(client->bev, client);
1372 	else
1373 		start_reply(client, CGI_ERROR, "CGI error");
1374 }
1375 
1376 static void
1377 do_accept(int sock, short et, void *d)
1378 {
1379 	struct client *c;
1380 	struct sockaddr_storage addr;
1381 	struct sockaddr *saddr;
1382 	socklen_t len;
1383 	int fd;
1384 
1385 	saddr = (struct sockaddr*)&addr;
1386 	len = sizeof(addr);
1387 	if ((fd = accept(sock, saddr, &len)) == -1) {
1388 		if (errno == EWOULDBLOCK || errno == EAGAIN ||
1389 		    errno == ECONNABORTED)
1390 			return;
1391 		fatal("accept: %s", strerror(errno));
1392 	}
1393 
1394 	mark_nonblock(fd);
1395 
1396 	c = xcalloc(1, sizeof(*c));
1397 	c->id = ++server_client_id;
1398 	c->fd = fd;
1399 	c->pfd = -1;
1400 	c->addr = addr;
1401 
1402 	if (tls_accept_socket(ctx, &c->ctx, fd) == -1) {
1403 		log_warn(c, "failed to accept socket: %s", tls_error(c->ctx));
1404 		close(c->fd);
1405 		free(c);
1406 		return;
1407 	}
1408 
1409 	SPLAY_INSERT(client_tree_id, &clients, c);
1410 	event_once(c->fd, EV_READ|EV_WRITE, handle_handshake, c, NULL);
1411 	connected_clients++;
1412 }
1413 
1414 static struct client *
1415 client_by_id(int id)
1416 {
1417 	struct client *c;
1418 
1419 	if ((c = try_client_by_id(id)) == NULL)
1420 		fatal("in client_by_id: invalid id %d", id);
1421 	return c;
1422 }
1423 
1424 struct client *
1425 try_client_by_id(int id)
1426 {
1427 	struct client find;
1428 
1429 	find.id = id;
1430 	return SPLAY_FIND(client_tree_id, &clients, &find);
1431 }
1432 
1433 static void
1434 handle_imsg_cgi_res(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1435 {
1436 	struct client *c;
1437 
1438 	c = client_by_id(imsg->hdr.peerid);
1439 
1440 	if ((c->pfd = imsg->fd) == -1) {
1441 		start_reply(c, TEMP_FAILURE, "internal server error");
1442 		return;
1443 	}
1444 
1445 	c->type = REQUEST_CGI;
1446 
1447 	c->cgibev = bufferevent_new(c->pfd, cgi_read, cgi_write,
1448 	    cgi_error, c);
1449 
1450 	bufferevent_enable(c->cgibev, EV_READ);
1451 }
1452 
1453 static void
1454 handle_imsg_fcgi_fd(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1455 {
1456 	struct client	*c;
1457 	int		 id;
1458 
1459 	id = imsg->hdr.peerid;
1460 
1461 	if ((c = try_client_by_id(id)) == NULL) {
1462 		if (imsg->fd != -1)
1463 			close(imsg->fd);
1464 		return;
1465 	}
1466 
1467 	if ((c->pfd = imsg->fd) == -1) {
1468 		start_reply(c, CGI_ERROR, "CGI error");
1469 		return;
1470 	}
1471 
1472 	mark_nonblock(c->pfd);
1473 
1474 	c->cgibev = bufferevent_new(c->pfd, fcgi_read, fcgi_write,
1475 	    fcgi_error, c);
1476 	if (c->cgibev == NULL) {
1477 		start_reply(c, TEMP_FAILURE, "internal server error");
1478 		return;
1479 	}
1480 
1481 	bufferevent_enable(c->cgibev, EV_READ|EV_WRITE);
1482 	fcgi_req(c);
1483 }
1484 
1485 static void
1486 handle_imsg_conn_fd(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1487 {
1488 	struct client	*c;
1489 	int		 id;
1490 
1491 	id = imsg->hdr.peerid;
1492 	if ((c = try_client_by_id(id)) == NULL) {
1493 		if (imsg->fd != -1)
1494 			close(imsg->fd);
1495 		return;
1496 	}
1497 
1498 	if ((c->pfd = imsg->fd) == -1) {
1499 		start_reply(c, PROXY_ERROR, "proxy error");
1500 		return;
1501 	}
1502 
1503 	mark_nonblock(c->pfd);
1504 
1505 	if (proxy_init(c) == -1)
1506 		start_reply(c, PROXY_ERROR, "proxy error");
1507 }
1508 
1509 static void
1510 handle_imsg_quit(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1511 {
1512 	/*
1513 	 * don't call event_loopbreak since we want to finish to
1514 	 * handle the ongoing connections.
1515 	 */
1516 
1517 	shutting_down = 1;
1518 
1519 	event_del(&e4);
1520 	if (has_ipv6)
1521 		event_del(&e6);
1522 	if (has_siginfo)
1523 		signal_del(&siginfo);
1524 	event_del(&imsgev);
1525 	signal_del(&sigusr2);
1526 }
1527 
1528 static void
1529 handle_dispatch_imsg(int fd, short ev, void *d)
1530 {
1531 	struct imsgbuf *ibuf = d;
1532 	dispatch_imsg(ibuf, handlers, sizeof(handlers));
1533 }
1534 
1535 static void
1536 handle_siginfo(int fd, short ev, void *d)
1537 {
1538 	log_info(NULL, "%d connected clients", connected_clients);
1539 }
1540 
1541 void
1542 loop(struct tls *ctx_, int sock4, int sock6, struct imsgbuf *ibuf)
1543 {
1544 	ctx = ctx_;
1545 
1546 	SPLAY_INIT(&clients);
1547 
1548 	event_init();
1549 
1550 	event_set(&e4, sock4, EV_READ | EV_PERSIST, &do_accept, NULL);
1551 	event_add(&e4, NULL);
1552 
1553 	if (sock6 != -1) {
1554 		has_ipv6 = 1;
1555 		event_set(&e6, sock6, EV_READ | EV_PERSIST, &do_accept, NULL);
1556 		event_add(&e6, NULL);
1557 	}
1558 
1559 	event_set(&imsgev, ibuf->fd, EV_READ | EV_PERSIST, handle_dispatch_imsg, ibuf);
1560 	event_add(&imsgev, NULL);
1561 
1562 #ifdef SIGINFO
1563 	has_siginfo = 1;
1564 	signal_set(&siginfo, SIGINFO, &handle_siginfo, NULL);
1565 	signal_add(&siginfo, NULL);
1566 #endif
1567 	signal_set(&sigusr2, SIGUSR2, &handle_siginfo, NULL);
1568 	signal_add(&sigusr2, NULL);
1569 
1570 	sandbox_server_process();
1571 	event_dispatch();
1572 	_exit(0);
1573 }
1574 
1575 int
1576 client_tree_cmp(struct client *a, struct client *b)
1577 {
1578 	if (a->id == b->id)
1579 		return 0;
1580 	else if (a->id < b->id)
1581 		return -1;
1582 	else
1583 		return +1;
1584 }
1585 
1586 SPLAY_GENERATE(client_tree_id, client, entry, client_tree_cmp)