1 /*
2  * Copyright (c) 2021, 2022, 2023 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 #include <sys/un.h>
21 
22 #include <assert.h>
23 #include <ctype.h>
24 #include <errno.h>
25 #include <event.h>
26 #include <fcntl.h>
27 #include <fnmatch.h>
28 #include <limits.h>
29 #include <string.h>
30 
31 #include "log.h"
32 #include "proc.h"
33 
34 #define MIN(a, b)	((a) < (b) ? (a) : (b))
35 
36 #ifndef nitems
37 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
38 #endif
39 
40 #ifdef SIGINFO
41 static struct event siginfo;
42 #endif
43 static struct event sigusr2;
44 
45 int connected_clients;
46 
47 /*
48  * This function is not publicy exported because it is a hack until libtls
49  * has a proper privsep setup.
50  */
51 void tls_config_use_fake_private_key(struct tls_config *);
52 
53 static inline int matches(const char*, const char*);
54 
55 static void	 handle_handshake(int, short, void*);
56 static const char *strip_path(const char*, int);
57 static void	 fmtbuf(char *, size_t, const char *, struct client *,
58 		    const char *);
59 static int	 apply_block_return(struct client*);
60 static int	 check_matching_certificate(X509_STORE *, struct client *);
61 static int	 apply_reverse_proxy(struct client *);
62 static int	 apply_fastcgi(struct client*);
63 static int	 apply_require_ca(struct client*);
64 static void	 open_dir(struct client*);
65 static void	 redirect_canonical_dir(struct client*);
66 
67 static void	 client_tls_readcb(int, short, void *);
68 static void	 client_tls_writecb(int, short, void *);
69 
70 static void	 client_read(struct bufferevent *, void *);
71 void		 client_write(struct bufferevent *, void *);
72 static void	 client_error(struct bufferevent *, short, void *);
73 
74 static void	 client_close_ev(int, short, void *);
75 
76 static void	 handle_siginfo(int, short, void*);
77 
78 static int	 server_dispatch_parent(int, struct privsep_proc *, struct imsg *);
79 static int	 server_dispatch_crypto(int, struct privsep_proc *, struct imsg *);
80 static int	 server_dispatch_logger(int, struct privsep_proc *, struct imsg *);
81 
82 static struct privsep_proc procs[] = {
83 	{ "parent",	PROC_PARENT,	server_dispatch_parent },
84 	{ "crypto",	PROC_CRYPTO,	server_dispatch_crypto },
85 	{ "logger",	PROC_LOGGER,	server_dispatch_logger },
86 };
87 
88 static uint32_t server_client_id;
89 
90 struct client_tree_id clients;
91 
92 static inline int
93 match_addr(struct address *target, struct address *source)
94 {
95 	return (target->ai_flags == source->ai_flags &&
96 	    target->ai_family == source->ai_family &&
97 	    target->ai_socktype == source->ai_socktype &&
98 	    target->ai_protocol == source->ai_protocol &&
99 	    target->slen == source->slen &&
100 	    !memcmp(&target->ss, &source->ss, target->slen));
101 }
102 
103 static inline int
104 matches(const char *pattern, const char *path)
105 {
106 	if (*path == '/')
107 		path++;
108 	return !fnmatch(pattern, path, 0);
109 }
110 
111 static inline int
112 match_host(struct vhost *v, struct client *c)
113 {
114 	struct alist *a;
115 	struct address *addr;
116 
117 	TAILQ_FOREACH(addr, &v->addrs, addrs)
118 		if (match_addr(addr, c->addr))
119 			break;
120 	if (addr == NULL)
121 		return 0;
122 
123 	if (matches(v->domain, c->domain))
124 		return 1;
125 
126 	TAILQ_FOREACH(a, &v->aliases, aliases)
127 		if (matches(a->alias, c->domain))
128 			return 1;
129 
130 	return 0;
131 }
132 
133 const char *
134 vhost_lang(struct vhost *v, const char *path)
135 {
136 	struct location *loc;
137 
138 	if (v == NULL || path == NULL)
139 		return NULL;
140 
141 	loc = TAILQ_FIRST(&v->locations);
142 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
143 		if (*loc->lang != '\0') {
144 			if (matches(loc->match, path))
145 				return loc->lang;
146 		}
147 	}
148 
149 	loc = TAILQ_FIRST(&v->locations);
150 	if (*loc->lang == '\0')
151 		return NULL;
152 	return loc->lang;
153 }
154 
155 const char *
156 vhost_default_mime(struct vhost *v, const char *path)
157 {
158 	struct location *loc;
159 	const char *default_mime = "application/octet-stream";
160 
161 	if (v == NULL || path == NULL)
162 		return default_mime;
163 
164 	loc = TAILQ_FIRST(&v->locations);
165 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
166 		if (*loc->default_mime != '\0') {
167 			if (matches(loc->match, path))
168 				return loc->default_mime;
169 		}
170 	}
171 
172 	loc = TAILQ_FIRST(&v->locations);
173 	if (*loc->default_mime != '\0')
174 		return loc->default_mime;
175 	return default_mime;
176 }
177 
178 const char *
179 vhost_index(struct vhost *v, const char *path)
180 {
181 	struct location *loc;
182 	const char *index = "index.gmi";
183 
184 	if (v == NULL || path == NULL)
185 		return index;
186 
187 	loc = TAILQ_FIRST(&v->locations);
188 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
189 		if (*loc->index != '\0') {
190 			if (matches(loc->match, path))
191 				return loc->index;
192 		}
193 	}
194 
195 	loc = TAILQ_FIRST(&v->locations);
196 	if (*loc->index != '\0')
197 		return loc->index;
198 	return index;
199 }
200 
201 int
202 vhost_auto_index(struct vhost *v, const char *path)
203 {
204 	struct location *loc;
205 
206 	if (v == NULL || path == NULL)
207 		return 0;
208 
209 	loc = TAILQ_FIRST(&v->locations);
210 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
211 		if (loc->auto_index != 0) {
212 			if (matches(loc->match, path))
213 				return loc->auto_index == 1;
214 		}
215 	}
216 
217 	loc = TAILQ_FIRST(&v->locations);
218 	return loc->auto_index == 1;
219 }
220 
221 int
222 vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
223 {
224 	struct location *loc;
225 
226 	if (v == NULL || path == NULL)
227 		return 0;
228 
229 	loc = TAILQ_FIRST(&v->locations);
230 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
231 		if (loc->block_code != 0) {
232 			if (matches(loc->match, path)) {
233 				*code = loc->block_code;
234 				*fmt = loc->block_fmt;
235 				return 1;
236 			}
237 		}
238 	}
239 
240 	loc = TAILQ_FIRST(&v->locations);
241 	*code = loc->block_code;
242 	*fmt = loc->block_fmt;
243 	return loc->block_code != 0;
244 }
245 
246 struct location *
247 vhost_fastcgi(struct vhost *v, const char *path)
248 {
249 	struct location *loc;
250 
251 	if (v == NULL || path == NULL)
252 		return NULL;
253 
254 	loc = TAILQ_FIRST(&v->locations);
255 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
256 		if (loc->fcgi != -1)
257 			if (matches(loc->match, path))
258 				return loc;
259 	}
260 
261 	loc = TAILQ_FIRST(&v->locations);
262 	return loc->fcgi == -1 ? NULL : loc;
263 }
264 
265 int
266 vhost_dirfd(struct vhost *v, const char *path, size_t *retloc)
267 {
268 	struct location *loc;
269 	size_t		 l = 0;
270 
271 	if (v == NULL || path == NULL)
272 		return -1;
273 
274 	loc = TAILQ_FIRST(&v->locations);
275 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
276 		l++;
277 		if (loc->dirfd != -1)
278 			if (matches(loc->match, path)) {
279 				*retloc = l;
280 				return loc->dirfd;
281 			}
282 	}
283 
284 	*retloc = 0;
285 	loc = TAILQ_FIRST(&v->locations);
286 	return loc->dirfd;
287 }
288 
289 int
290 vhost_strip(struct vhost *v, const char *path)
291 {
292 	struct location *loc;
293 
294 	if (v == NULL || path == NULL)
295 		return 0;
296 
297 	loc = TAILQ_FIRST(&v->locations);
298 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
299 		if (loc->strip != 0) {
300 			if (matches(loc->match, path))
301 				return loc->strip;
302 		}
303 	}
304 
305 	loc = TAILQ_FIRST(&v->locations);
306 	return loc->strip;
307 }
308 
309 X509_STORE *
310 vhost_require_ca(struct vhost *v, const char *path)
311 {
312 	struct location *loc;
313 
314 	if (v == NULL || path == NULL)
315 		return NULL;
316 
317 	loc = TAILQ_FIRST(&v->locations);
318 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
319 		if (loc->reqca != NULL) {
320 			if (matches(loc->match, path))
321 				return loc->reqca;
322 		}
323 	}
324 
325 	loc = TAILQ_FIRST(&v->locations);
326 	return loc->reqca;
327 }
328 
329 int
330 vhost_disable_log(struct vhost *v, const char *path)
331 {
332 	struct location *loc;
333 
334 	if (v == NULL || path == NULL)
335 		return 0;
336 
337 	loc = TAILQ_FIRST(&v->locations);
338 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
339 		if (loc->disable_log && matches(loc->match, path))
340 				return 1;
341 	}
342 
343 	loc = TAILQ_FIRST(&v->locations);
344 	return loc->disable_log;
345 }
346 
347 void
348 mark_nonblock(int fd)
349 {
350 	int flags;
351 
352 	if ((flags = fcntl(fd, F_GETFL)) == -1)
353 		fatal("fcntl(F_GETFL)");
354 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
355 		fatal("fcntl(F_SETFL)");
356 }
357 
358 static void
359 handle_handshake(int fd, short ev, void *d)
360 {
361 	struct client *c = d;
362 	struct conf *conf = c->conf;
363 	struct vhost *h;
364 	const char *servname;
365 	const char *parse_err = "unknown error";
366 
367 	switch (tls_handshake(c->ctx)) {
368 	case 0:  /* success */
369 		break;
370 	case -1:
371 		log_warnx("tls_handshake failed: %s", tls_error(c->ctx));
372 		client_close(c);
373 		return;
374 	case TLS_WANT_POLLIN:
375 		event_once(c->fd, EV_READ, handle_handshake, c, NULL);
376 		return;
377 	case TLS_WANT_POLLOUT:
378 		event_once(c->fd, EV_WRITE, handle_handshake, c, NULL);
379 		return;
380 	default:
381 		/* unreachable */
382 		abort();
383 	}
384 
385 	c->bev = bufferevent_new(fd, client_read, client_write,
386 	    client_error, c);
387 	if (c->bev == NULL)
388 		fatal("%s: failed to allocate client buffer", __func__);
389 
390 	event_set(&c->bev->ev_read, c->fd, EV_READ,
391 	    client_tls_readcb, c->bev);
392 	event_set(&c->bev->ev_write, c->fd, EV_WRITE,
393 	    client_tls_writecb, c->bev);
394 
395 #if HAVE_LIBEVENT2
396 	evbuffer_unfreeze(c->bev->input, 0);
397 	evbuffer_unfreeze(c->bev->output, 1);
398 #endif
399 
400 	if ((servname = tls_conn_servername(c->ctx)) == NULL) {
401 		log_debug("handshake: missing SNI");
402 		goto err;
403 	}
404 
405 	if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
406 		log_info("puny_decode: %s", parse_err);
407 		goto err;
408 	}
409 
410 	TAILQ_FOREACH(h, &conf->hosts, vhosts)
411 		if (match_host(h, c))
412 			break;
413 
414 	log_debug("handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
415 	    servname != NULL ? servname : "(null)",
416 	    c->domain,
417 	    h != NULL ? h->domain : "(null)");
418 
419 	if (h != NULL) {
420 		c->host = h;
421 		bufferevent_enable(c->bev, EV_READ);
422 		return;
423 	}
424 
425 err:
426 	start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
427 }
428 
429 static const char *
430 strip_path(const char *path, int strip)
431 {
432 	char *t;
433 
434 	while (strip > 0) {
435 		if ((t = strchr(path, '/')) == NULL) {
436 			path = strchr(path, '\0');
437 			break;
438 		}
439 		path = t;
440 		strip--;
441 	}
442 
443 	return path;
444 }
445 
446 static void
447 fmtbuf(char *buf, size_t buflen, const char *fmt, struct client *c,
448     const char *path)
449 {
450 	size_t i;
451 	char tmp[32];
452 
453 	*buf = '\0';
454 	memset(tmp, 0, sizeof(tmp));
455 	for (i = 0; *fmt; ++fmt) {
456 		if (i == sizeof(tmp)-1 || *fmt == '%') {
457 			strlcat(buf, tmp, buflen);
458 			memset(tmp, 0, sizeof(tmp));
459 			i = 0;
460 		}
461 
462 		if (*fmt != '%') {
463 			tmp[i++] = *fmt;
464 			continue;
465 		}
466 
467 		switch (*++fmt) {
468 		case '%':
469 			strlcat(buf, "%", buflen);
470 			break;
471 		case 'p':
472 			if (*path != '/')
473 				strlcat(buf, "/", buflen);
474 			strlcat(buf, path, buflen);
475 			break;
476 		case 'q':
477 			strlcat(buf, c->iri.query, buflen);
478 			break;
479 		case 'P':
480 			snprintf(tmp, sizeof(tmp), "%d", c->addr->port);
481 			strlcat(buf, tmp, buflen);
482 			memset(tmp, 0, sizeof(tmp));
483 			break;
484 		case 'N':
485 			strlcat(buf, c->domain, buflen);
486 			break;
487 		default:
488 			log_warnx("%s: unknown fmt specifier %c",
489 			    __func__, *fmt);
490 		}
491 	}
492 
493 	if (i != 0)
494 		strlcat(buf, tmp, buflen);
495 }
496 
497 /* 1 if a matching `block return' (and apply it), 0 otherwise */
498 static int
499 apply_block_return(struct client *c)
500 {
501 	char buf[GEMINI_URL_LEN];
502 	const char *fmt, *path;
503 	int code;
504 
505 	if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
506 		return 0;
507 
508 	path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
509 	fmtbuf(buf, sizeof(buf), fmt, c, path);
510 
511 	start_reply(c, code, buf);
512 	return 1;
513 }
514 
515 static struct proxy *
516 matched_proxy(struct client *c)
517 {
518 	struct proxy	*p;
519 	const char	*proto;
520 	const char	*host;
521 	const char	*port;
522 
523 	TAILQ_FOREACH(p, &c->host->proxies, proxies) {
524 		if (*(proto = p->match_proto) == '\0')
525 			proto = "gemini";
526 		if (*(host = p->match_host) == '\0')
527 			host = "*";
528 		if (*(port = p->match_port) == '\0')
529 			port = "*";
530 
531 		if (matches(proto, c->iri.schema) &&
532 		    matches(host, c->domain) &&
533 		    matches(port, c->iri.port))
534 			return p;
535 	}
536 
537 	return NULL;
538 }
539 
540 static int
541 check_matching_certificate(X509_STORE *store, struct client *c)
542 {
543 	const uint8_t	*cert;
544 	size_t		 len;
545 
546 	if (!tls_peer_cert_provided(c->ctx)) {
547 		start_reply(c, CLIENT_CERT_REQ, "client certificate required");
548 		return 1;
549 	}
550 
551 	cert = tls_peer_cert_chain_pem(c->ctx, &len);
552 	if (!validate_against_ca(store, cert, len)) {
553 		start_reply(c, CERT_NOT_AUTH, "certificate not authorised");
554 		return 1;
555 	}
556 
557 	return 0;
558 }
559 
560 static int
561 proxy_socket(struct client *c, const char *host, const char *port)
562 {
563 	struct addrinfo hints, *res, *res0;
564 	int r, sock, save_errno;
565 	const char *cause = NULL;
566 
567 	memset(&hints, 0, sizeof(hints));
568 	hints.ai_family = AF_UNSPEC;
569 	hints.ai_socktype = SOCK_STREAM;
570 
571 	/* XXX: asr_run? :> */
572 	r = getaddrinfo(host, port, &hints, &res0);
573 	if (r != 0) {
574 		log_warnx("getaddrinfo(\"%s\", \"%s\"): %s",
575 		    host, port, gai_strerror(r));
576 		return -1;
577 	}
578 
579 	for (res = res0; res; res = res->ai_next) {
580 		sock = socket(res->ai_family, res->ai_socktype,
581 		    res->ai_protocol);
582 		if (sock == -1) {
583 			cause = "socket";
584 			continue;
585 		}
586 
587 		if (connect(sock, res->ai_addr, res->ai_addrlen) == -1) {
588 			cause = "connect";
589 			save_errno = errno;
590 			close(sock);
591 			errno = save_errno;
592 			sock = -1;
593 			continue;
594 		}
595 
596 		break;
597 	}
598 
599 	if (sock == -1)
600 		log_warn("can't connect to %s:%s: %s", host, port, cause);
601 
602 	freeaddrinfo(res0);
603 
604 	return sock;
605 }
606 
607 /* 1 if matching a proxy relay-to (and apply it), 0 otherwise */
608 static int
609 apply_reverse_proxy(struct client *c)
610 {
611 	struct proxy	*p;
612 
613 	if ((p = matched_proxy(c)) == NULL)
614 		return 0;
615 
616 	c->proxy = p;
617 
618 	if (p->reqca != NULL && check_matching_certificate(p->reqca, c))
619 		return 1;
620 
621 	log_debug("opening proxy connection for %s:%s",
622 	    p->host, p->port);
623 
624 	if ((c->pfd = proxy_socket(c, p->host, p->port)) == -1) {
625 		start_reply(c, PROXY_ERROR, "proxy error");
626 		return 1;
627 	}
628 
629 	mark_nonblock(c->pfd);
630 	if (proxy_init(c) == -1)
631 		start_reply(c, PROXY_ERROR, "proxy error");
632 
633 	return 1;
634 }
635 
636 static int
637 fcgi_open_sock(struct fcgi *f)
638 {
639 	struct sockaddr_un	addr;
640 	int			fd;
641 
642 	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
643 		log_warn("socket");
644 		return -1;
645 	}
646 
647 	memset(&addr, 0, sizeof(addr));
648 	addr.sun_family = AF_UNIX;
649 	strlcpy(addr.sun_path, f->path, sizeof(addr.sun_path));
650 
651 	if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
652 		log_warn("failed to connect to %s", f->path);
653 		close(fd);
654 		return -1;
655 	}
656 
657 	return fd;
658 }
659 
660 static int
661 fcgi_open_conn(struct fcgi *f)
662 {
663 	struct addrinfo	 hints, *servinfo, *p;
664 	int		 r, sock, save_errno;
665 	const char	*cause = NULL;
666 
667 	memset(&hints, 0, sizeof(hints));
668 	hints.ai_family = AF_UNSPEC;
669 	hints.ai_socktype = SOCK_STREAM;
670 	hints.ai_flags = AI_ADDRCONFIG;
671 
672 	if ((r = getaddrinfo(f->path, f->port, &hints, &servinfo)) != 0) {
673 		log_warnx("getaddrinfo %s:%s: %s", f->path, f->port,
674 		    gai_strerror(r));
675 		return -1;
676 	}
677 
678 	for (p = servinfo; p != NULL; p = p->ai_next) {
679 		sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
680 		if (sock == -1) {
681 			cause = "socket";
682 			continue;
683 		}
684 		if (connect(sock, p->ai_addr, p->ai_addrlen) == -1) {
685 			cause = "connect";
686 			save_errno = errno;
687 			close(sock);
688 			errno = save_errno;
689 			continue;
690 		}
691 		break;
692 	}
693 
694 	if (p == NULL) {
695 		log_warn("couldn't connect to %s:%s: %s", f->path, f->port,
696 		    cause);
697 		sock = -1;
698 	}
699 
700 	freeaddrinfo(servinfo);
701 	return sock;
702 }
703 
704 /* 1 if matching `fcgi' (and apply it), 0 otherwise */
705 static int
706 apply_fastcgi(struct client *c)
707 {
708 	int		 i = 0;
709 	struct fcgi	*f;
710 	struct location	*loc;
711 
712 	if ((loc = vhost_fastcgi(c->host, c->iri.path)) == NULL)
713 		return 0;
714 
715 	TAILQ_FOREACH(f, &c->conf->fcgi, fcgi) {
716 		if (i == loc->fcgi)
717 			break;
718 		++i;
719 	}
720 
721 	if (f == NULL) {
722 		log_warnx("can't find fcgi #%d", loc->fcgi);
723 		return 0;
724 	}
725 
726 	log_debug("opening fastcgi connection for (%s,%s)",
727 	    f->path, f->port);
728 
729 	if (*f->port == '\0')
730 		c->pfd = fcgi_open_sock(f);
731 	else
732 		c->pfd = fcgi_open_conn(f);
733 
734 	if (c->pfd == -1) {
735 		start_reply(c, CGI_ERROR, "CGI error");
736 		return 1;
737 	}
738 
739 	mark_nonblock(c->pfd);
740 
741 	c->cgibev = bufferevent_new(c->pfd, fcgi_read, fcgi_write,
742 	    fcgi_error, c);
743 	if (c->cgibev == NULL) {
744 		start_reply(c, TEMP_FAILURE, "internal server error");
745 		return 1;
746 	}
747 
748 	bufferevent_enable(c->cgibev, EV_READ|EV_WRITE);
749 	fcgi_req(c, loc);
750 
751 	return 1;
752 }
753 
754 /* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
755 static int
756 apply_require_ca(struct client *c)
757 {
758 	X509_STORE	*store;
759 
760 	if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
761 		return 0;
762 	return check_matching_certificate(store, c);
763 }
764 
765 static void
766 server_dir_listing(struct client *c)
767 {
768 	int root;
769 
770 	root = !strcmp(c->iri.path, "/") || *c->iri.path == '\0';
771 
772 	if (!vhost_auto_index(c->host, c->iri.path)) {
773 		start_reply(c, NOT_FOUND, "not found");
774 		return;
775 	}
776 
777 	c->dirlen = scandir_fd(c->pfd, &c->dir,
778 	    root ? select_non_dotdot : select_non_dot,
779 	    alphasort);
780 	if (c->dirlen == -1) {
781 		log_warn("scandir_fd(%d) (vhost:%s) %s",
782 		    c->pfd, c->host->domain, c->iri.path);
783 		start_reply(c, TEMP_FAILURE, "internal server error");
784 		return;
785 	}
786 
787 	c->type = REQUEST_DIR;
788 	start_reply(c, SUCCESS, "text/gemini");
789 	evbuffer_add_printf(EVBUFFER_OUTPUT(c->bev),
790 	    "# Index of /%s\n\n", c->iri.path);
791 }
792 
793 static void
794 open_dir(struct client *c)
795 {
796 	struct stat sb;
797 	const char *index;
798 	char path[PATH_MAX];
799 	int fd = -1;
800 
801 	if (*c->iri.path != '\0' && !ends_with(c->iri.path, "/")) {
802 		redirect_canonical_dir(c);
803 		return;
804 	}
805 
806 	index = vhost_index(c->host, c->iri.path);
807 	fd = openat(c->pfd, index, O_RDONLY);
808 	if (fd == -1) {
809 		server_dir_listing(c);
810 		return;
811 	}
812 
813 	if (fstat(fd, &sb) == -1) {
814 		log_warn("fstat");
815 		close(fd);
816 		start_reply(c, TEMP_FAILURE, "internal server error");
817 		return;
818 	}
819 
820 	if (!S_ISREG(sb.st_mode)) {
821 		close(fd);
822 		server_dir_listing(c);
823 		return;
824 	}
825 
826 	strlcpy(path, c->iri.path, sizeof(path));
827 	strlcat(path, index, sizeof(path));
828 
829 	close(c->pfd);
830 	c->pfd = fd;
831 	c->type = REQUEST_FILE;
832 	start_reply(c, SUCCESS, mime(c->conf, c->host, path));
833 }
834 
835 static void
836 redirect_canonical_dir(struct client *c)
837 {
838 	char buf[GEMINI_URL_LEN];
839 	int r;
840 
841 	r = snprintf(buf, sizeof(buf), "/%s/", c->iri.path);
842 	if (r < 0 || (size_t)r >= sizeof(buf)) {
843 		start_reply(c, TEMP_FAILURE, "internal server error");
844 		return;
845 	}
846 
847 	start_reply(c, TEMP_REDIRECT, buf);
848 }
849 
850 static void
851 client_tls_readcb(int fd, short event, void *d)
852 {
853 	struct bufferevent	*bufev = d;
854 	struct client		*client = bufev->cbarg;
855 	ssize_t			 ret;
856 	size_t			 len;
857 	int			 what = EVBUFFER_READ;
858 	int			 howmuch = IBUF_READ_SIZE;
859 	char			 buf[IBUF_READ_SIZE];
860 
861 	if (event == EV_TIMEOUT) {
862 		what |= EVBUFFER_TIMEOUT;
863 		goto err;
864 	}
865 
866 	if (bufev->wm_read.high != 0)
867 		howmuch = MIN(sizeof(buf), bufev->wm_read.high);
868 
869 	switch (ret = tls_read(client->ctx, buf, howmuch)) {
870 	case TLS_WANT_POLLIN:
871 	case TLS_WANT_POLLOUT:
872 		goto retry;
873 	case -1:
874 		what |= EVBUFFER_ERROR;
875 		goto err;
876 	}
877 	len = ret;
878 
879 	if (len == 0) {
880 		what |= EVBUFFER_EOF;
881 		goto err;
882 	}
883 
884 	if (evbuffer_add(bufev->input, buf, len) == -1) {
885 		what |= EVBUFFER_ERROR;
886 		goto err;
887 	}
888 
889 	event_add(&bufev->ev_read, NULL);
890 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
891 		return;
892 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
893 		/*
894 		 * here we could implement a read pressure policy.
895 		 */
896 	}
897 
898 	if (bufev->readcb != NULL)
899 		(*bufev->readcb)(bufev, bufev->cbarg);
900 
901 	return;
902 
903 retry:
904 	event_add(&bufev->ev_read, NULL);
905 	return;
906 
907 err:
908 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
909 }
910 
911 static void
912 client_tls_writecb(int fd, short event, void *d)
913 {
914 	struct bufferevent	*bufev = d;
915 	struct client		*client = bufev->cbarg;
916 	ssize_t			 ret;
917 	size_t			 len;
918 	short			 what = EVBUFFER_WRITE;
919 
920 	if (event == EV_TIMEOUT) {
921 		what |= EVBUFFER_TIMEOUT;
922 		goto err;
923 	}
924 
925 	if (EVBUFFER_LENGTH(bufev->output) != 0) {
926 		ret = tls_write(client->ctx,
927 		    EVBUFFER_DATA(bufev->output),
928 		    EVBUFFER_LENGTH(bufev->output));
929 		switch (ret) {
930 		case TLS_WANT_POLLIN:
931 		case TLS_WANT_POLLOUT:
932 			goto retry;
933 		case -1:
934 			what |= EVBUFFER_ERROR;
935 			goto err;
936 		}
937 		len = ret;
938 		evbuffer_drain(bufev->output, len);
939 	}
940 
941 	if (EVBUFFER_LENGTH(bufev->output) != 0)
942 		event_add(&bufev->ev_write, NULL);
943 
944 	if (bufev->writecb != NULL &&
945 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
946 		(*bufev->writecb)(bufev, bufev->cbarg);
947 	return;
948 
949 retry:
950 	event_add(&bufev->ev_write, NULL);
951 	return;
952 err:
953 	log_warnx("tls error: %s", tls_error(client->ctx));
954 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
955 }
956 
957 static void
958 client_read(struct bufferevent *bev, void *d)
959 {
960 	struct stat	 sb;
961 	struct client	*c = d;
962 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
963 	const char	*path, *p, *parse_err = "invalid request";
964 	char		 decoded[DOMAIN_NAME_LEN];
965 
966 	bufferevent_disable(bev, EVBUFFER_READ);
967 
968 	/*
969 	 * libevent2 can still somehow call this function, even
970 	 * though I never enable EV_READ in the bufferevent.  If
971 	 * that's the case, bail out.
972 	 */
973 	if (c->type != REQUEST_UNDECIDED)
974 		return;
975 
976 	/* max url len + \r\n */
977 	if (EVBUFFER_LENGTH(src) > 1024 + 2) {
978 		log_debug("too much data received");
979 		start_reply(c, BAD_REQUEST, "bad request");
980 		return;
981 	}
982 
983 	c->req = evbuffer_readln(src, &c->reqlen, EVBUFFER_EOL_CRLF_STRICT);
984 	if (c->req == NULL) {
985 		/* not enough data yet. */
986 		bufferevent_enable(bev, EVBUFFER_READ);
987 		return;
988 	}
989 	if (c->reqlen > 1024+2) {
990 		log_debug("URL too long");
991 		start_reply(c, BAD_REQUEST, "bad request");
992 		return;
993 	}
994 
995 	if (!parse_iri(c->req, &c->iri, &parse_err) ||
996 	    !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
997 		log_debug("IRI parse error: %s", parse_err);
998 		start_reply(c, BAD_REQUEST, "bad request");
999 		return;
1000 	}
1001 
1002 	if (apply_reverse_proxy(c))
1003 		return;
1004 
1005 	/* ignore the port number */
1006 	if (strcmp(c->iri.schema, "gemini") ||
1007 	    strcmp(decoded, c->domain)) {
1008 		start_reply(c, PROXY_REFUSED, "won't proxy request");
1009 		return;
1010 	}
1011 
1012 	if (apply_require_ca(c) ||
1013 	    apply_block_return(c)||
1014 	    apply_fastcgi(c))
1015 		return;
1016 
1017 	path = c->iri.path;
1018 	p = strip_path(path, vhost_strip(c->host, path));
1019 	while (*p == '/')
1020 		p++;
1021 	if (*p == '\0')
1022 		p = ".";
1023 
1024 	c->pfd = openat(vhost_dirfd(c->host, path, &c->loc), p, O_RDONLY);
1025 	if (c->pfd == -1) {
1026 		if (errno == EACCES)
1027 			log_info("can't open %s: %s", p, strerror(errno));
1028 		start_reply(c, NOT_FOUND, "not found");
1029 		return;
1030 	}
1031 
1032 	if (fstat(c->pfd, &sb) == -1) {
1033 		log_warnx("fstat %s", path);
1034 		start_reply(c, TEMP_FAILURE, "internal server error");
1035 		return;
1036 	}
1037 
1038 	if (S_ISDIR(sb.st_mode)) {
1039 		open_dir(c);
1040 		return;
1041 	}
1042 
1043 	c->type = REQUEST_FILE;
1044 	start_reply(c, SUCCESS, mime(c->conf, c->host, p));
1045 }
1046 
1047 void
1048 client_write(struct bufferevent *bev, void *d)
1049 {
1050 	struct client	*c = d;
1051 	struct evbuffer	*out = EVBUFFER_OUTPUT(bev);
1052 	char		 nam[PATH_MAX];
1053 	char		 buf[BUFSIZ];
1054 	ssize_t		 r;
1055 
1056 	switch (c->type) {
1057 	case REQUEST_UNDECIDED:
1058 		/*
1059 		 * Ignore spurious calls when we still don't have idea
1060 		 * what to do with the request.
1061 		 */
1062 		break;
1063 
1064 	case REQUEST_FILE:
1065 		if ((r = read(c->pfd, buf, sizeof(buf))) == -1) {
1066 			log_warn("read");
1067 			client_error(bev, EVBUFFER_ERROR, c);
1068 			return;
1069 		} else if (r == 0) {
1070 			client_close(c);
1071 			return;
1072 		} else if (r != sizeof(buf))
1073 			c->type = REQUEST_DONE;
1074 		bufferevent_write(bev, buf, r);
1075 		break;
1076 
1077 	case REQUEST_DIR:
1078 		/* TODO: handle big big directories better */
1079 		for (c->diroff = 0; c->diroff < c->dirlen; ++c->diroff) {
1080 			const char *sufx = "";
1081 
1082 			encode_path(nam, sizeof(nam),
1083 			    c->dir[c->diroff]->d_name);
1084 			if (c->dir[c->diroff]->d_type == DT_DIR)
1085 				sufx = "/";
1086 			evbuffer_add_printf(out, "=> ./%s%s\n", nam, sufx);
1087 			free(c->dir[c->diroff]);
1088 		}
1089 		free(c->dir);
1090 		c->dir = NULL;
1091 
1092 		c->type = REQUEST_DONE;
1093 
1094 		event_add(&c->bev->ev_write, NULL);
1095 		break;
1096 
1097 	case REQUEST_FCGI:
1098 	case REQUEST_PROXY:
1099 		/*
1100 		 * Here we depend on fastcgi or proxy connection to
1101 		 * 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_debug("timeout; forcefully closing the connection");
1121 		if (c->code == 0)
1122 			start_reply(c, BAD_REQUEST, "timeout");
1123 		else
1124 			client_close(c);
1125 		return;
1126 	}
1127 
1128 	if (error & EVBUFFER_EOF) {
1129 		client_close(c);
1130 		return;
1131 	}
1132 
1133 	log_warnx("unknown bufferevent error 0x%x", error);
1134 	client_close(c);
1135 }
1136 
1137 void
1138 start_reply(struct client *c, int code, const char *meta)
1139 {
1140 	struct evbuffer	*evb = EVBUFFER_OUTPUT(c->bev);
1141 	const char	*lang;
1142 	int		 r, rr;
1143 
1144 	bufferevent_enable(c->bev, EVBUFFER_WRITE);
1145 
1146 	c->code = code;
1147 	c->meta = meta;
1148 
1149 	r = evbuffer_add_printf(evb, "%d %s", code, meta);
1150 	if (r == -1)
1151 		goto err;
1152 
1153 	/* 2 digit status + space + 1024 max reply */
1154 	if (r > 1027)
1155 		goto overflow;
1156 
1157 	if (c->type != REQUEST_FCGI &&
1158 	    c->type != REQUEST_PROXY &&
1159 	    !strcmp(meta, "text/gemini") &&
1160 	    (lang = vhost_lang(c->host, c->iri.path)) != NULL) {
1161 		rr = evbuffer_add_printf(evb, ";lang=%s", lang);
1162 		if (rr == -1)
1163 			goto err;
1164 		if (r + rr > 1027)
1165 			goto overflow;
1166 	}
1167 
1168 	bufferevent_write(c->bev, "\r\n", 2);
1169 
1170 	if (!vhost_disable_log(c->host, c->iri.path))
1171 		log_request(c, code, meta);
1172 
1173 	if (code != 20)
1174 		c->type = REQUEST_DONE;
1175 
1176 	return;
1177 
1178 err:
1179 	log_warnx("evbuffer_add_printf error: no memory");
1180 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1181 	client_close(c);
1182 	return;
1183 
1184 overflow:
1185 	log_warnx("reply header overflow");
1186 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1187 	start_reply(c, TEMP_FAILURE, "internal error");
1188 }
1189 
1190 static void
1191 client_close_ev(int fd, short event, void *d)
1192 {
1193 	struct client	*c = d;
1194 
1195 	switch (tls_close(c->ctx)) {
1196 	case TLS_WANT_POLLIN:
1197 		event_once(c->fd, EV_READ, client_close_ev, c, NULL);
1198 		return;
1199 	case TLS_WANT_POLLOUT:
1200 		event_once(c->fd, EV_WRITE, client_close_ev, c, NULL);
1201 		return;
1202 	}
1203 
1204 	connected_clients--;
1205 
1206 	free(c->req);
1207 
1208 	tls_free(c->ctx);
1209 	c->ctx = NULL;
1210 
1211 	free(c->header);
1212 
1213 	if (c->pfd != -1)
1214 		close(c->pfd);
1215 
1216 	if (c->dir != NULL)
1217 		free(c->dir);
1218 
1219 	close(c->fd);
1220 	c->fd = -1;
1221 
1222 	free(c);
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 gets 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 	if (c->bev != NULL) {
1269 		bufferevent_disable(c->bev, EVBUFFER_READ|EVBUFFER_WRITE);
1270 		bufferevent_free(c->bev);
1271 	}
1272 
1273 	if (c->proxyevset &&
1274 	    event_pending(&c->proxyev, EV_READ|EV_WRITE, NULL)) {
1275 		c->proxyevset = 0;
1276 		event_del(&c->proxyev);
1277 	}
1278 
1279 	if (c->pfd != -1 && c->proxyctx != NULL) {
1280 		/* shut down the proxy TLS connection */
1281 		client_proxy_close(c->pfd, 0, c->proxyctx);
1282 		c->pfd = -1;
1283 	}
1284 
1285 	if (c->proxybev != NULL)
1286 		bufferevent_free(c->proxybev);
1287 
1288 	client_close_ev(c->fd, 0, c);
1289 }
1290 
1291 void
1292 server_accept(int sock, short et, void *d)
1293 {
1294 	struct address *addr = d;
1295 	struct client *c;
1296 	struct sockaddr_storage raddr;
1297 	struct sockaddr *sraddr;
1298 	socklen_t len;
1299 	int e, fd;
1300 
1301 	sraddr = (struct sockaddr *)&raddr;
1302 	len = sizeof(raddr);
1303 	if ((fd = accept(sock, sraddr, &len)) == -1) {
1304 		if (errno == EWOULDBLOCK || errno == EAGAIN ||
1305 		    errno == ECONNABORTED)
1306 			return;
1307 		fatal("accept");
1308 	}
1309 
1310 	mark_nonblock(fd);
1311 
1312 	c = xcalloc(1, sizeof(*c));
1313 	c->conf = addr->conf;
1314 	c->addr = addr;
1315 	c->id = ++server_client_id;
1316 	c->fd = fd;
1317 	c->pfd = -1;
1318 	memcpy(&c->raddr, &raddr, sizeof(raddr));
1319 	c->raddrlen = len;
1320 
1321 	e = getnameinfo(sraddr, len, c->rhost, sizeof(c->rhost),
1322 	    c->rserv, sizeof(c->rserv), NI_NUMERICHOST | NI_NUMERICSERV);
1323 	if (e != 0) {
1324 		log_warnx("getnameinfo failed: %s", gai_strerror(e));
1325 		close(c->fd);
1326 		free(c);
1327 		return;
1328 	}
1329 
1330 	if (tls_accept_socket(addr->ctx, &c->ctx, fd) == -1) {
1331 		log_warnx("failed to accept socket: %s", tls_error(c->ctx));
1332 		close(c->fd);
1333 		free(c);
1334 		return;
1335 	}
1336 
1337 	SPLAY_INSERT(client_tree_id, &clients, c);
1338 	event_once(c->fd, EV_READ|EV_WRITE, handle_handshake, c, NULL);
1339 	connected_clients++;
1340 }
1341 
1342 struct client *
1343 client_by_id(int id)
1344 {
1345 	struct client find;
1346 
1347 	find.id = id;
1348 	return SPLAY_FIND(client_tree_id, &clients, &find);
1349 }
1350 
1351 static void
1352 handle_siginfo(int fd, short ev, void *d)
1353 {
1354 	log_info("%d connected clients", connected_clients);
1355 }
1356 
1357 static void
1358 add_matching_kps(struct tls_config *tlsconf, struct address *addr,
1359     struct conf *conf)
1360 {
1361 	struct address	*vaddr;
1362 	struct vhost	*h;
1363 	int		 r, any = 0;
1364 
1365 	TAILQ_FOREACH(h, &conf->hosts, vhosts) {
1366 		TAILQ_FOREACH(vaddr, &h->addrs, addrs) {
1367 			if (!match_addr(addr, vaddr))
1368 				continue;
1369 
1370 			if (!any) {
1371 				any = 1;
1372 				r = tls_config_set_keypair_ocsp_mem(tlsconf,
1373 				    h->cert, h->certlen, h->key, h->keylen,
1374 				    h->ocsp, h->ocsplen);
1375 			} else {
1376 				r = tls_config_add_keypair_ocsp_mem(tlsconf,
1377 				    h->cert, h->certlen, h->key, h->keylen,
1378 				    h->ocsp, h->ocsplen);
1379 			}
1380 
1381 			if (r == -1)
1382 				fatalx("failed to load keypair"
1383 				    " for host %s: %s", h->domain,
1384 				    tls_config_error(tlsconf));
1385 		}
1386 	}
1387 }
1388 
1389 static void
1390 setup_tls(struct conf *conf)
1391 {
1392 	struct tls_config	*tlsconf;
1393 	struct address		*addr;
1394 
1395 	TAILQ_FOREACH(addr, &conf->addrs, addrs) {
1396 		if ((tlsconf = tls_config_new()) == NULL)
1397 			fatal("tls_config_new");
1398 
1399 		if (conf->use_privsep_crypto)
1400 			tls_config_use_fake_private_key(tlsconf);
1401 
1402 		/* optionally accept client certs but don't verify */
1403 		tls_config_verify_client_optional(tlsconf);
1404 		tls_config_insecure_noverifycert(tlsconf);
1405 
1406 		if (tls_config_set_protocols(tlsconf, conf->protos) == -1)
1407 			fatalx("tls_config_set_protocols: %s",
1408 			    tls_config_error(tlsconf));
1409 
1410 		add_matching_kps(tlsconf, addr, conf);
1411 
1412 		tls_reset(addr->ctx);
1413 		if (tls_configure(addr->ctx, tlsconf) == -1)
1414 			fatalx("tls_configure: %s", tls_error(addr->ctx));
1415 
1416 		tls_config_free(tlsconf);
1417 	}
1418 }
1419 
1420 static void
1421 load_vhosts(struct conf *conf)
1422 {
1423 	struct vhost	*h;
1424 	struct location	*l;
1425 
1426 	TAILQ_FOREACH(h, &conf->hosts, vhosts) {
1427 		TAILQ_FOREACH(l, &h->locations, locations) {
1428 			if (*l->dir == '\0')
1429 				continue;
1430 			l->dirfd = open(l->dir, O_RDONLY | O_DIRECTORY);
1431 			if (l->dirfd == -1)
1432 				fatal("open %s for domain %s", l->dir,
1433 				    h->domain);
1434 		}
1435 	}
1436 }
1437 
1438 void
1439 server(struct privsep *ps, struct privsep_proc *p)
1440 {
1441 	proc_run(ps, p, procs, nitems(procs), server_init, NULL);
1442 }
1443 
1444 void
1445 server_init(struct privsep *ps, struct privsep_proc *p, void *arg)
1446 {
1447 	struct conf *c;
1448 
1449 	SPLAY_INIT(&clients);
1450 
1451 #ifdef SIGINFO
1452 	signal_set(&siginfo, SIGINFO, &handle_siginfo, NULL);
1453 	signal_add(&siginfo, NULL);
1454 #endif
1455 	signal_set(&sigusr2, SIGUSR2, &handle_siginfo, NULL);
1456 	signal_add(&sigusr2, NULL);
1457 
1458 	sandbox_server_process();
1459 
1460 	/*
1461 	 * ge doesn't use the privsep crypto engine; it doesn't use
1462 	 * privsep at all so `ps' is NULL.
1463 	 */
1464 	if (ps != NULL) {
1465 		c = ps->ps_env;
1466 		if (c->use_privsep_crypto)
1467 			crypto_engine_init(ps->ps_env);
1468 	}
1469 }
1470 
1471 int
1472 server_configure_done(struct conf *conf)
1473 {
1474 	struct address *addr;
1475 
1476 	if (load_default_mime(&conf->mime) == -1)
1477 		fatal("can't load default mime");
1478 	sort_mime(&conf->mime);
1479 	setup_tls(conf);
1480 	load_vhosts(conf);
1481 
1482 	TAILQ_FOREACH(addr, &conf->addrs, addrs) {
1483 		if (addr->sock != -1)
1484 			event_add(&addr->evsock, NULL);
1485 	}
1486 
1487 	return 0;
1488 }
1489 
1490 static int
1491 server_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
1492 {
1493 	struct privsep	*ps = p->p_ps;
1494 	struct conf	*conf = ps->ps_env;
1495 
1496 	switch (imsg->hdr.type) {
1497 	case IMSG_RECONF_START:
1498 	case IMSG_RECONF_MIME:
1499 	case IMSG_RECONF_PROTOS:
1500 	case IMSG_RECONF_SOCK:
1501 	case IMSG_RECONF_FCGI:
1502 	case IMSG_RECONF_HOST:
1503 	case IMSG_RECONF_CERT:
1504 	case IMSG_RECONF_KEY:
1505 	case IMSG_RECONF_OCSP:
1506 	case IMSG_RECONF_HOST_ADDR:
1507 	case IMSG_RECONF_LOC:
1508 	case IMSG_RECONF_ENV:
1509 	case IMSG_RECONF_ALIAS:
1510 	case IMSG_RECONF_PROXY:
1511 	case IMSG_RECONF_PROXY_CERT:
1512 	case IMSG_RECONF_PROXY_KEY:
1513 		return config_recv(conf, imsg);
1514 	case IMSG_RECONF_END:
1515 		if (config_recv(conf, imsg) == -1)
1516 			return -1;
1517 		if (server_configure_done(conf) == -1)
1518 			return -1;
1519 		break;
1520 	default:
1521 		return -1;
1522 	}
1523 
1524 	return 0;
1525 }
1526 
1527 static int
1528 server_dispatch_crypto(int fd, struct privsep_proc *p, struct imsg *imsg)
1529 {
1530 	return -1;
1531 }
1532 
1533 static int
1534 server_dispatch_logger(int fd, struct privsep_proc *p, struct imsg *imsg)
1535 {
1536 	return -1;
1537 }
1538 
1539 int
1540 client_tree_cmp(struct client *a, struct client *b)
1541 {
1542 	if (a->id == b->id)
1543 		return 0;
1544 	else if (a->id < b->id)
1545 		return -1;
1546 	else
1547 		return +1;
1548 }
1549 
1550 SPLAY_GENERATE(client_tree_id, client, entry, client_tree_cmp)