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Date:: Sat Oct 2 17:20:56 2021 UTC
Message:: new I/O handling on top of bufferevents This is a big change in how gmid handles I/O. Initially we used a hand-written loop over poll(2), that then was evolved into something powered by libevent basic API. This meant that there were a lot of small "asynchronous" function that did one step, eventually scheduling the re-execution, that called each others in a chain. The new implementation revolves completely around libevent' bufferevents. It's more clear, as everything is implemented around the client_read and client_write functions. There is still space for improvements, like adding timeouts for one, but it's solid enough to be committed as is and then further improved.
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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 struct client	 clients[MAX_USERS];
35 
36 static struct tls	*ctx;
37 
38 static struct event e4, e6, imsgev, siginfo, sigusr2;
39 static int has_ipv6, has_siginfo;
40 
41 int connected_clients;
42 
43 static inline int matches(const char*, const char*);
44 
45 static int	 check_path(struct client*, const char*, int*);
46 static void	 open_file(struct client*);
47 static void	 check_for_cgi(struct client*);
48 static void	 handle_handshake(int, short, void*);
49 static const char *strip_path(const char*, int);
50 static void	 fmt_sbuf(const char*, struct client*, const char*);
51 static int	 apply_block_return(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_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 };
86 
87 static inline int
88 matches(const char *pattern, const char *path)
89 {
90 	if (*path == '/')
91 		path++;
92 	return !fnmatch(pattern, path, 0);
93 }
94 
95 const char *
96 vhost_lang(struct vhost *v, const char *path)
97 {
98 	struct location *loc;
99 
100 	if (v == NULL || path == NULL)
101 		return NULL;
102 
103 	loc = TAILQ_FIRST(&v->locations);
104 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
105 		if (loc->lang != NULL) {
106 			if (matches(loc->match, path))
107 				return loc->lang;
108 		}
109 	}
110 
111 	return TAILQ_FIRST(&v->locations)->lang;
112 }
113 
114 const char *
115 vhost_default_mime(struct vhost *v, const char *path)
116 {
117 	struct location *loc;
118 	const char *default_mime = "application/octet-stream";
119 
120 	if (v == NULL || path == NULL)
121 		return default_mime;
122 
123 	loc = TAILQ_FIRST(&v->locations);
124 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
125 		if (loc->default_mime != NULL) {
126 			if (matches(loc->match, path))
127 				return loc->default_mime;
128 		}
129 	}
130 
131 	loc = TAILQ_FIRST(&v->locations);
132 	if (loc->default_mime != NULL)
133 		return loc->default_mime;
134 	return default_mime;
135 }
136 
137 const char *
138 vhost_index(struct vhost *v, const char *path)
139 {
140 	struct location *loc;
141 	const char *index = "index.gmi";
142 
143 	if (v == NULL || path == NULL)
144 		return index;
145 
146 	loc = TAILQ_FIRST(&v->locations);
147 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
148 		if (loc->index != NULL) {
149 			if (matches(loc->match, path))
150 				return loc->index;
151 		}
152 	}
153 
154 	loc = TAILQ_FIRST(&v->locations);
155 	if (loc->index != NULL)
156 		return loc->index;
157 	return index;
158 }
159 
160 int
161 vhost_auto_index(struct vhost *v, const char *path)
162 {
163 	struct location *loc;
164 
165 	if (v == NULL || path == NULL)
166 		return 0;
167 
168 	loc = TAILQ_FIRST(&v->locations);
169 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
170 		if (loc->auto_index != 0) {
171 			if (matches(loc->match, path))
172 				return loc->auto_index == 1;
173 		}
174 	}
175 
176 	loc = TAILQ_FIRST(&v->locations);
177 	return loc->auto_index == 1;
178 }
179 
180 int
181 vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
182 {
183 	struct location *loc;
184 
185 	if (v == NULL || path == NULL)
186 		return 0;
187 
188 	loc = TAILQ_FIRST(&v->locations);
189 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
190 		if (loc->block_code != 0) {
191 			if (matches(loc->match, path)) {
192 				*code = loc->block_code;
193 				*fmt = loc->block_fmt;
194 				return 1;
195 			}
196 		}
197 	}
198 
199 	loc = TAILQ_FIRST(&v->locations);
200 	*code = loc->block_code;
201 	*fmt = loc->block_fmt;
202 	return loc->block_code != 0;
203 }
204 
205 int
206 vhost_fastcgi(struct vhost *v, const char *path)
207 {
208 	struct location *loc;
209 
210 	if (v == NULL || path == NULL)
211 		return -1;
212 
213 	loc = TAILQ_FIRST(&v->locations);
214 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
215 		if (loc->fcgi != -1)
216 			if (matches(loc->match, path))
217 				return loc->fcgi;
218 	}
219 
220 	loc = TAILQ_FIRST(&v->locations);
221 	return loc->fcgi;
222 }
223 
224 int
225 vhost_dirfd(struct vhost *v, const char *path, size_t *retloc)
226 {
227 	struct location *loc;
228 	size_t		 l = 0;
229 
230 	if (v == NULL || path == NULL)
231 		return -1;
232 
233 	loc = TAILQ_FIRST(&v->locations);
234 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
235 		l++;
236 		if (loc->dirfd != -1)
237 			if (matches(loc->match, path)) {
238 				*retloc = l;
239 				return loc->dirfd;
240 			}
241 	}
242 
243 	*retloc = 0;
244 	loc = TAILQ_FIRST(&v->locations);
245 	return loc->dirfd;
246 }
247 
248 int
249 vhost_strip(struct vhost *v, const char *path)
250 {
251 	struct location *loc;
252 
253 	if (v == NULL || path == NULL)
254 		return 0;
255 
256 	loc = TAILQ_FIRST(&v->locations);
257 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
258 		if (loc->strip != 0) {
259 			if (matches(loc->match, path))
260 				return loc->strip;
261 		}
262 	}
263 
264 	loc = TAILQ_FIRST(&v->locations);
265 	return loc->strip;
266 }
267 
268 X509_STORE *
269 vhost_require_ca(struct vhost *v, const char *path)
270 {
271 	struct location *loc;
272 
273 	if (v == NULL || path == NULL)
274 		return NULL;
275 
276 	loc = TAILQ_FIRST(&v->locations);
277 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
278 		if (loc->reqca != NULL) {
279 			if (matches(loc->match, path))
280 				return loc->reqca;
281 		}
282 	}
283 
284 	loc = TAILQ_FIRST(&v->locations);
285 	return loc->reqca;
286 }
287 
288 int
289 vhost_disable_log(struct vhost *v, const char *path)
290 {
291 	struct location *loc;
292 
293 	if (v == NULL || path == NULL)
294 		return 0;
295 
296 	loc = TAILQ_FIRST(&v->locations);
297 	while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
298 		if (loc->disable_log && matches(loc->match, path))
299 				return 1;
300 	}
301 
302 	loc = TAILQ_FIRST(&v->locations);
303 	return loc->disable_log;
304 }
305 
306 static int
307 check_path(struct client *c, const char *path, int *fd)
308 {
309 	struct stat sb;
310 	const char *p;
311 	int dirfd, strip;
312 
313 	assert(path != NULL);
314 
315 	/*
316 	 * in send_dir we add an initial / (to be redirect-friendly),
317 	 * but here we want to skip it
318 	 */
319 	if (*path == '/')
320 		path++;
321 
322 	strip = vhost_strip(c->host, path);
323 	p = strip_path(path, strip);
324 
325 	if (*p == '/')
326 		p = p+1;
327 	if (*p == '\0')
328 		p = ".";
329 
330 	dirfd = vhost_dirfd(c->host, path, &c->loc);
331 	log_debug(c, "check_path: strip=%d path=%s original=%s",
332 	    strip, p, path);
333 	if (*fd == -1 && (*fd = openat(dirfd, p, O_RDONLY)) == -1)
334 		return FILE_MISSING;
335 
336 	if (fstat(*fd, &sb) == -1) {
337 		log_notice(c, "failed stat for %s: %s", path, strerror(errno));
338 		return FILE_MISSING;
339 	}
340 
341 	if (S_ISDIR(sb.st_mode))
342 		return FILE_DIRECTORY;
343 
344 	if (sb.st_mode & S_IXUSR)
345 		return FILE_EXECUTABLE;
346 
347 	return FILE_EXISTS;
348 }
349 
350 static void
351 open_file(struct client *c)
352 {
353 	switch (check_path(c, c->iri.path, &c->pfd)) {
354 	case FILE_EXECUTABLE:
355 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
356 			start_cgi(c->iri.path, "", c);
357 			return;
358 		}
359 
360 		/* fallthrough */
361 
362 	case FILE_EXISTS:
363 		c->type = REQUEST_FILE;
364 		start_reply(c, SUCCESS, mime(c->host, c->iri.path));
365 		return;
366 
367 	case FILE_DIRECTORY:
368 		open_dir(c);
369 		return;
370 
371 	case FILE_MISSING:
372 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
373 			check_for_cgi(c);
374 			return;
375 		}
376 		start_reply(c, NOT_FOUND, "not found");
377 		return;
378 
379 	default:
380 		/* unreachable */
381 		abort();
382 	}
383 }
384 
385 /*
386  * the inverse of this algorithm, i.e. starting from the start of the
387  * path + strlen(cgi), and checking if each component, should be
388  * faster.  But it's tedious to write.  This does the opposite: starts
389  * from the end and strip one component at a time, until either an
390  * executable is found or we emptied the path.
391  */
392 static void
393 check_for_cgi(struct client *c)
394 {
395 	char path[PATH_MAX];
396 	char *end;
397 
398 	strlcpy(path, c->iri.path, sizeof(path));
399 	end = strchr(path, '\0');
400 
401 	while (end > path) {
402 		/*
403 		 * go up one level.  UNIX paths are simple and POSIX
404 		 * dirname, with its ambiguities on if the given
405 		 * pointer is changed or not, gives me headaches.
406 		 */
407 		while (*end != '/' && end > path)
408 			end--;
409 
410 		if (end == path)
411 			break;
412 
413 		*end = '\0';
414 
415 		switch (check_path(c, path, &c->pfd)) {
416 		case FILE_EXECUTABLE:
417 			start_cgi(path, end+1, c);
418 			return;
419 		case FILE_MISSING:
420 			break;
421 		default:
422 			goto err;
423 		}
424 
425 		*end = '/';
426 		end--;
427 	}
428 
429 err:
430 	start_reply(c, NOT_FOUND, "not found");
431 	return;
432 }
433 
434 void
435 mark_nonblock(int fd)
436 {
437 	int flags;
438 
439 	if ((flags = fcntl(fd, F_GETFL)) == -1)
440 		fatal("fcntl(F_GETFL): %s", strerror(errno));
441 	if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
442 		fatal("fcntl(F_SETFL): %s", strerror(errno));
443 }
444 
445 static void
446 handle_handshake(int fd, short ev, void *d)
447 {
448 	struct client *c = d;
449 	struct vhost *h;
450 	struct alist *a;
451 	const char *servname;
452 	const char *parse_err = "unknown error";
453 
454 	switch (tls_handshake(c->ctx)) {
455 	case 0:  /* success */
456 	case -1: /* already handshaked */
457 		break;
458 	case TLS_WANT_POLLIN:
459 		event_once(c->fd, EV_READ, handle_handshake, c, NULL);
460 		return;
461 	case TLS_WANT_POLLOUT:
462 		event_once(c->fd, EV_WRITE, handle_handshake, c, NULL);
463 		return;
464 	default:
465 		/* unreachable */
466 		abort();
467 	}
468 
469 	if ((servname = tls_conn_servername(c->ctx)) == NULL) {
470 		log_debug(c, "handshake: missing SNI");
471 		goto err;
472 	}
473 
474 	if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
475 		log_info(c, "puny_decode: %s", parse_err);
476 		goto err;
477 	}
478 
479 	TAILQ_FOREACH(h, &hosts, vhosts) {
480 		if (matches(h->domain, c->domain))
481 			goto found;
482 		TAILQ_FOREACH(a, &h->aliases, aliases) {
483 			if (matches(a->alias, c->domain))
484 				goto found;
485 		}
486 	}
487 
488 found:
489 	log_debug(c, "handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
490 	    servname != NULL ? servname : "(null)",
491 	    c->domain,
492 	    h != NULL ? h->domain : "(null)");
493 
494 	if (h != NULL) {
495 		c->host = h;
496 
497 		c->bev = bufferevent_new(fd, client_read, client_write,
498 		    client_error, c);
499 		if (c->bev == NULL)
500 			fatal("%s: failed to allocate client buffer: %s",
501 			    __func__, strerror(errno));
502 
503 		event_set(&c->bev->ev_read, c->fd, EV_READ,
504 		    client_tls_readcb, c->bev);
505 		event_set(&c->bev->ev_write, c->fd, EV_WRITE,
506 		    client_tls_writecb, c->bev);
507 
508 		bufferevent_enable(c->bev, EV_READ);
509 
510 		return;
511 	}
512 
513 err:
514 	start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
515 }
516 
517 static const char *
518 strip_path(const char *path, int strip)
519 {
520 	char *t;
521 
522 	while (strip > 0) {
523 		if ((t = strchr(path, '/')) == NULL) {
524 			path = strchr(path, '\0');
525 			break;
526 		}
527 		path = t;
528 		strip--;
529 	}
530 
531 	return path;
532 }
533 
534 static void
535 fmt_sbuf(const char *fmt, struct client *c, const char *path)
536 {
537 	size_t i;
538         char buf[32];
539 
540 	memset(buf, 0, sizeof(buf));
541 	for (i = 0; *fmt; ++fmt) {
542 		if (i == sizeof(buf)-1 || *fmt == '%') {
543 			strlcat(c->sbuf, buf, sizeof(c->sbuf));
544 			memset(buf, 0, sizeof(buf));
545 			i = 0;
546 		}
547 
548 		if (*fmt != '%') {
549 			buf[i++] = *fmt;
550 			continue;
551 		}
552 
553 		switch (*++fmt) {
554 		case '%':
555 			strlcat(c->sbuf, "%", sizeof(c->sbuf));
556 			break;
557 		case 'p':
558 			if (*path != '/')
559 				strlcat(c->sbuf, "/", sizeof(c->sbuf));
560 			strlcat(c->sbuf, path, sizeof(c->sbuf));
561 			break;
562 		case 'q':
563 			strlcat(c->sbuf, c->iri.query, sizeof(c->sbuf));
564 			break;
565 		case 'P':
566 			snprintf(buf, sizeof(buf), "%d", conf.port);
567 			strlcat(c->sbuf, buf, sizeof(c->sbuf));
568 			memset(buf, 0, sizeof(buf));
569 			break;
570 		case 'N':
571 			strlcat(c->sbuf, c->domain, sizeof(c->sbuf));
572 			break;
573 		default:
574 			fatal("%s: unknown fmt specifier %c",
575 			    __func__, *fmt);
576 		}
577 	}
578 
579 	if (i != 0)
580 		strlcat(c->sbuf, buf, sizeof(c->sbuf));
581 }
582 
583 /* 1 if a matching `block return' (and apply it), 0 otherwise */
584 static int
585 apply_block_return(struct client *c)
586 {
587 	const char *fmt, *path;
588 	int code;
589 
590 	if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
591 		return 0;
592 
593 	path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
594 	fmt_sbuf(fmt, c, path);
595 
596 	start_reply(c, code, c->sbuf);
597 	return 1;
598 }
599 
600 /* 1 if matching `fcgi' (and apply it), 0 otherwise */
601 static int
602 apply_fastcgi(struct client *c)
603 {
604 	int		 id;
605 	struct fcgi	*f;
606 
607 	if ((id = vhost_fastcgi(c->host, c->iri.path)) == -1)
608 		return 0;
609 
610 	switch ((f = &fcgi[id])->s) {
611 	case FCGI_OFF:
612 		f->s = FCGI_INFLIGHT;
613 		log_info(c, "opening fastcgi connection for (%s,%s,%s)",
614 		    f->path, f->port, f->prog);
615 		imsg_compose(&exibuf, IMSG_FCGI_REQ, 0, 0, -1,
616 		    &id, sizeof(id));
617 		imsg_flush(&exibuf);
618                 /* fallthrough */
619 	case FCGI_INFLIGHT:
620                 c->fcgi = id;
621 		break;
622 	case FCGI_READY:
623                 c->fcgi = id;
624 		fcgi_req(f, c);
625 		break;
626 	}
627 
628 	return 1;
629 }
630 
631 /* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
632 static int
633 apply_require_ca(struct client *c)
634 {
635 	X509_STORE	*store;
636 	const uint8_t	*cert;
637 	size_t		 len;
638 
639 	if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
640 		return 0;
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 static size_t
657 host_nth(struct vhost *h)
658 {
659 	struct vhost	*v;
660 	size_t		 i = 0;
661 
662 	TAILQ_FOREACH(v, &hosts, vhosts) {
663 		if (v == h)
664 			return i;
665 		i++;
666 	}
667 
668 	abort();
669 }
670 
671 static void
672 start_cgi(const char *spath, const char *relpath, struct client *c)
673 {
674 	char addr[NI_MAXHOST];
675 	const char *t;
676 	struct cgireq req;
677 	int e;
678 
679 	c->type = REQUEST_CGI;
680 
681 	e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
682 	    addr, sizeof(addr),
683 	    NULL, 0,
684 	    NI_NUMERICHOST);
685 	if (e != 0)
686 		fatal("getnameinfo failed");
687 
688 	memset(&req, 0, sizeof(req));
689 
690 	memcpy(req.buf, c->req, sizeof(req.buf));
691 
692 	req.iri_schema_off = c->iri.schema - c->req;
693 	req.iri_host_off = c->iri.host - c->req;
694 	req.iri_port_off = c->iri.port - c->req;
695 	req.iri_path_off = c->iri.path - c->req;
696 	req.iri_query_off = c->iri.query - c->req;
697 	req.iri_fragment_off = c->iri.fragment - c->req;
698 
699 	req.iri_portno = c->iri.port_no;
700 
701 	strlcpy(req.spath, spath, sizeof(req.spath));
702 	strlcpy(req.relpath, relpath, sizeof(req.relpath));
703 	strlcpy(req.addr, addr, sizeof(req.addr));
704 
705 	if ((t = tls_peer_cert_subject(c->ctx)) != NULL)
706 		strlcpy(req.subject, t, sizeof(req.subject));
707 	if ((t = tls_peer_cert_issuer(c->ctx)) != NULL)
708 		strlcpy(req.issuer, t, sizeof(req.issuer));
709 	if ((t = tls_peer_cert_hash(c->ctx)) != NULL)
710 		strlcpy(req.hash, t, sizeof(req.hash));
711 	if ((t = tls_conn_version(c->ctx)) != NULL)
712 		strlcpy(req.version, t, sizeof(req.version));
713 	if ((t = tls_conn_cipher(c->ctx)) != NULL)
714 		strlcpy(req.cipher, t, sizeof(req.cipher));
715 
716 	req.cipher_strength = tls_conn_cipher_strength(c->ctx);
717 	req.notbefore = tls_peer_cert_notbefore(c->ctx);
718 	req.notafter = tls_peer_cert_notafter(c->ctx);
719 
720 	req.host_off = host_nth(c->host);
721 	req.loc_off = c->loc;
722 
723 	imsg_compose(&exibuf, IMSG_CGI_REQ, c->id, 0, -1, &req, sizeof(req));
724 	imsg_flush(&exibuf);
725 
726 	close(c->pfd);
727 }
728 
729 static void
730 open_dir(struct client *c)
731 {
732 	size_t len;
733 	int dirfd, root;
734 	char *before_file;
735 
736 	root = !strcmp(c->iri.path, "/") || *c->iri.path == '\0';
737 
738 	len = strlen(c->iri.path);
739 	if (len > 0 && !ends_with(c->iri.path, "/")) {
740 		redirect_canonical_dir(c);
741 		return;
742 	}
743 
744 	strlcpy(c->sbuf, "/", sizeof(c->sbuf));
745 	strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
746 	if (!ends_with(c->sbuf, "/"))
747 		strlcat(c->sbuf, "/", sizeof(c->sbuf));
748 	before_file = strchr(c->sbuf, '\0');
749 	len = strlcat(c->sbuf, vhost_index(c->host, c->iri.path),
750 	    sizeof(c->sbuf));
751 	if (len >= sizeof(c->sbuf)) {
752 		start_reply(c, TEMP_FAILURE, "internal server error");
753 		return;
754 	}
755 
756 	c->iri.path = c->sbuf;
757 
758 	/* close later unless we have to generate the dir listing */
759 	dirfd = c->pfd;
760 	c->pfd = -1;
761 
762 	switch (check_path(c, c->iri.path, &c->pfd)) {
763 	case FILE_EXECUTABLE:
764 		if (c->host->cgi != NULL && matches(c->host->cgi, c->iri.path)) {
765 			start_cgi(c->iri.path, "", c);
766 			break;
767 		}
768 
769 		/* fallthrough */
770 
771 	case FILE_EXISTS:
772 		c->type = REQUEST_FILE;
773 		start_reply(c, SUCCESS, mime(c->host, c->iri.path));
774 		break;
775 
776 	case FILE_DIRECTORY:
777 		start_reply(c, TEMP_REDIRECT, c->sbuf);
778 		break;
779 
780 	case FILE_MISSING:
781 		*before_file = '\0';
782 
783 		if (!vhost_auto_index(c->host, c->iri.path)) {
784 			start_reply(c, NOT_FOUND, "not found");
785 			break;
786 		}
787 
788 		c->type = REQUEST_DIR;
789 
790 		c->dirlen = scandir_fd(dirfd, &c->dir,
791 		    root ? select_non_dotdot : select_non_dot,
792 		    alphasort);
793 		if (c->dirlen == -1) {
794 			log_err(c, "scandir_fd(%d) (vhost:%s) %s: %s",
795 			    c->pfd, c->host->domain, c->iri.path, strerror(errno));
796 			start_reply(c, TEMP_FAILURE, "internal server error");
797 			return;
798 		}
799 		c->diroff = 0;
800 		c->off = 0;
801 
802                 start_reply(c, SUCCESS, "text/gemini");
803 		evbuffer_add_printf(EVBUFFER_OUTPUT(c->bev),
804 		    "# Index of %s\n\n", c->iri.path);
805 		return;
806 
807 	default:
808 		/* unreachable */
809 		abort();
810 	}
811 
812 	close(dirfd);
813 }
814 
815 static void
816 redirect_canonical_dir(struct client *c)
817 {
818 	size_t len;
819 
820 	strlcpy(c->sbuf, "/", sizeof(c->sbuf));
821 	strlcat(c->sbuf, c->iri.path, sizeof(c->sbuf));
822 	len = strlcat(c->sbuf, "/", sizeof(c->sbuf));
823 
824 	if (len >= sizeof(c->sbuf)) {
825 		start_reply(c, TEMP_FAILURE, "internal server error");
826 		return;
827 	}
828 
829 	start_reply(c, TEMP_REDIRECT, c->sbuf);
830 }
831 
832 static void
833 client_tls_readcb(int fd, short event, void *d)
834 {
835 	struct bufferevent	*bufev = d;
836 	struct client		*client = bufev->cbarg;
837 	ssize_t			 ret;
838 	size_t			 len;
839 	int			 what = EVBUFFER_READ;
840 	int			 howmuch = IBUF_READ_SIZE;
841 	char			 buf[IBUF_READ_SIZE];
842 
843 	if (event == EV_TIMEOUT) {
844 		what |= EVBUFFER_TIMEOUT;
845 		goto err;
846 	}
847 
848 	if (bufev->wm_read.high != 0)
849 		howmuch = MIN(sizeof(buf), bufev->wm_read.high);
850 
851 	switch (ret = tls_read(client->ctx, buf, howmuch)) {
852 	case TLS_WANT_POLLIN:
853 	case TLS_WANT_POLLOUT:
854 		goto retry;
855 	case -1:
856 		what |= EVBUFFER_ERROR;
857 		goto err;
858 	}
859 	len = ret;
860 
861 	if (len == 0) {
862 		what |= EVBUFFER_EOF;
863 		goto err;
864 	}
865 
866 	if (evbuffer_add(bufev->input, buf, len) == -1) {
867 		what |= EVBUFFER_ERROR;
868 		goto err;
869 	}
870 
871 	event_add(&bufev->ev_read, NULL);
872 	if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
873 		return;
874 	if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
875 		/*
876 		 * here we could implement a read pressure policy.
877 		 */
878 	}
879 
880 	if (bufev->readcb != NULL)
881 		(*bufev->readcb)(bufev, bufev->cbarg);
882 
883 	return;
884 
885 retry:
886 	event_add(&bufev->ev_read, NULL);
887 	return;
888 
889 err:
890 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
891 }
892 
893 static void
894 client_tls_writecb(int fd, short event, void *d)
895 {
896 	struct bufferevent	*bufev = d;
897 	struct client		*client = bufev->cbarg;
898 	ssize_t			 ret;
899 	size_t			 len;
900 	short			 what = EVBUFFER_WRITE;
901 
902 	if (event == EV_TIMEOUT) {
903 		what |= EVBUFFER_TIMEOUT;
904 		goto err;
905 	}
906 
907 	if (EVBUFFER_LENGTH(bufev->output) != 0) {
908 		ret = tls_write(client->ctx,
909 		    EVBUFFER_DATA(bufev->output),
910 		    EVBUFFER_LENGTH(bufev->output));
911 		switch (ret) {
912 		case TLS_WANT_POLLIN:
913 		case TLS_WANT_POLLOUT:
914 			goto retry;
915 		case -1:
916 			what |= EVBUFFER_ERROR;
917 			goto err;
918 		}
919 		len = ret;
920 		evbuffer_drain(bufev->output, len);
921 	}
922 
923 	if (EVBUFFER_LENGTH(bufev->output) != 0)
924 		event_add(&bufev->ev_write, NULL);
925 
926 	if (bufev->writecb != NULL &&
927 	    EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
928 		(*bufev->writecb)(bufev, bufev->cbarg);
929 	return;
930 
931 retry:
932 	event_add(&bufev->ev_write, NULL);
933 	return;
934 err:
935 	log_err(client, "tls error: %s", tls_error(client->ctx));
936 	(*bufev->errorcb)(bufev, what, bufev->cbarg);
937 }
938 
939 static void
940 client_read(struct bufferevent *bev, void *d)
941 {
942 	struct client	*c = d;
943 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
944 	const char	*parse_err = "invalid request";
945 	char		 decoded[DOMAIN_NAME_LEN];
946 	size_t		 len;
947 
948 	bufferevent_disable(bev, EVBUFFER_READ);
949 
950 	/* max url len + \r\n */
951 	if (EVBUFFER_LENGTH(src) > 1024 + 2) {
952 		log_err(c, "too much data received");
953 		start_reply(c, BAD_REQUEST, "bad request");
954 		return;
955 	}
956 
957 	c->req = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
958 	if (c->req == NULL) {
959 		/* not enough data yet. */
960 		bufferevent_enable(bev, EVBUFFER_READ);
961 		return;
962 	}
963 
964 	if (!parse_iri(c->req, &c->iri, &parse_err) ||
965 	    !puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
966 		log_err(c, "IRI parse error: %s", parse_err);
967                 start_reply(c, BAD_REQUEST, "bad request");
968 		return;
969 	}
970 
971 	if (c->iri.port_no != conf.port ||
972 	    strcmp(c->iri.schema, "gemini") ||
973 	    strcmp(decoded, c->domain)) {
974 		start_reply(c, PROXY_REFUSED, "won't proxy request");
975 		return;
976 	}
977 
978 	if (apply_require_ca(c) ||
979 	    apply_block_return(c)||
980 	    apply_fastcgi(c))
981 		return;
982 
983 	if (c->host->entrypoint != NULL) {
984 		c->loc = 0;
985 		start_cgi(c->host->entrypoint, c->iri.path, c);
986 		return;
987 	}
988 
989 	open_file(c);
990 }
991 
992 void
993 client_write(struct bufferevent *bev, void *d)
994 {
995 	struct client	*c = d;
996 	struct evbuffer	*out = EVBUFFER_OUTPUT(bev);
997 	char		 buf[BUFSIZ];
998 	ssize_t		 r;
999 
1000 	switch (c->type) {
1001 	case REQUEST_UNDECIDED:
1002 		/*
1003 		 * Ignore spurious calls when we still don't have idea
1004 		 * what to do with the request.
1005 		 */
1006 		break;
1007 
1008 	case REQUEST_FILE:
1009 		if ((r = read(c->pfd, buf, sizeof(buf))) == -1) {
1010 			log_warn(c, "read: %s", strerror(errno));
1011 			client_error(bev, EVBUFFER_ERROR, c);
1012 			return;
1013 		} else if (r == 0) {
1014 			client_close(c);
1015 			return;
1016 		} else if (r != sizeof(buf))
1017 			c->type = REQUEST_DONE;
1018 		bufferevent_write(bev, buf, r);
1019 		break;
1020 
1021 	case REQUEST_DIR:
1022 		/* TODO: handle big big directories better */
1023 		for (c->diroff = 0; c->diroff < c->dirlen; ++c->diroff) {
1024 			evbuffer_add_printf(out, "=> %s\n",
1025 			    c->dir[c->diroff]->d_name);
1026 			free(c->dir[c->diroff]);
1027 		}
1028 		free(c->dir);
1029 		c->dir = NULL;
1030 
1031 		c->type = REQUEST_DONE;
1032 
1033 		event_add(&c->bev->ev_write, NULL);
1034 		break;
1035 
1036 	case REQUEST_CGI:
1037 	case REQUEST_FCGI:
1038 		/*
1039 		 *  Here we depend on on the cgi script or fastcgi
1040 		 *  connection to provide data.
1041 		 */
1042 		break;
1043 
1044 	case REQUEST_DONE:
1045 		if (EVBUFFER_LENGTH(out) == 0)
1046 			client_close(c);
1047 		break;
1048 	}
1049 }
1050 
1051 static void
1052 client_error(struct bufferevent *bev, short error, void *d)
1053 {
1054 	struct client	*c = d;
1055 
1056 	if (c->type == REQUEST_FCGI)
1057 		fcgi_abort_request(c);
1058 
1059 	c->type = REQUEST_DONE;
1060 
1061 	if (error & EVBUFFER_TIMEOUT) {
1062 		log_warn(c, "timeout reached, "
1063 		    "forcefully closing the connection");
1064 		if (c->code == 0)
1065 			start_reply(c, BAD_REQUEST, "timeout");
1066 		else
1067 			client_close(c);
1068 		return;
1069 	}
1070 
1071 	if (error & EVBUFFER_EOF) {
1072 		client_close(c);
1073 		return;
1074 	}
1075 
1076 	log_err(c, "unknown bufferevent error: %s", strerror(errno));
1077 	client_close(c);
1078 }
1079 
1080 void
1081 start_reply(struct client *c, int code, const char *meta)
1082 {
1083 	struct evbuffer	*evb = EVBUFFER_OUTPUT(c->bev);
1084 	const char	*lang;
1085 	int		 r, rr;
1086 
1087 	bufferevent_enable(c->bev, EVBUFFER_WRITE);
1088 
1089 	c->code = code;
1090 	c->meta = meta;
1091 
1092 	r = evbuffer_add_printf(evb, "%d %s", code, meta);
1093 	if (r == -1)
1094 		goto err;
1095 
1096 	/* 2 digit status + space + 1024 max reply */
1097 	if (r > 1027)
1098 		goto overflow;
1099 
1100 	if (c->type != REQUEST_CGI &&
1101 	    c->type != REQUEST_FCGI &&
1102 	    !strcmp(meta, "text/gemini") &&
1103 	    (lang = vhost_lang(c->host, c->iri.path)) != NULL) {
1104                 rr = evbuffer_add_printf(evb, ";lang=%s", lang);
1105 		if (rr == -1)
1106 			goto err;
1107 		if (r + rr > 1027)
1108 			goto overflow;
1109 	}
1110 
1111 	bufferevent_write(c->bev, "\r\n", 2);
1112 
1113 	if (!vhost_disable_log(c->host, c->iri.path))
1114 		log_request(c, EVBUFFER_DATA(evb), EVBUFFER_LENGTH(evb));
1115 
1116 	if (code != 20 && IS_INTERNAL_REQUEST(c->type))
1117 		c->type = REQUEST_DONE;
1118 
1119 	return;
1120 
1121 err:
1122 	log_err(c, "evbuffer_add_printf error: no memory");
1123 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1124 	client_close(c);
1125 	return;
1126 
1127 overflow:
1128 	log_warn(c, "reply header overflow");
1129 	evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
1130 	start_reply(c, TEMP_FAILURE, "internal error");
1131 }
1132 
1133 static void
1134 client_close_ev(int fd, short event, void *d)
1135 {
1136 	struct client	*c = d;
1137 
1138 	switch (tls_close(c->ctx)) {
1139 	case TLS_WANT_POLLIN:
1140 		event_once(c->fd, EV_READ, client_close_ev, c, NULL);
1141 		break;
1142 	case TLS_WANT_POLLOUT:
1143 		event_once(c->fd, EV_WRITE, client_close_ev, c, NULL);
1144 		break;
1145 	}
1146 
1147 	connected_clients--;
1148 
1149 	tls_free(c->ctx);
1150 	c->ctx = NULL;
1151 
1152 	free(c->header);
1153 
1154 	if (c->pfd != -1)
1155 		close(c->pfd);
1156 
1157 	if (c->dir != NULL)
1158 		free(c->dir);
1159 
1160 	close(c->fd);
1161 	c->fd = -1;
1162 }
1163 
1164 void
1165 client_close(struct client *c)
1166 {
1167 	/*
1168 	 * We may end up calling client_close in various situations
1169 	 * and for the most unexpected reasons.  Therefore, we need to
1170 	 * ensure that everything is properly released once we reach
1171 	 * this point.
1172 	 */
1173 
1174 	if (c->type == REQUEST_FCGI)
1175 		fcgi_abort_request(c);
1176 
1177 	if (c->cgibev != NULL) {
1178 		bufferevent_disable(c->cgibev, EVBUFFER_READ|EVBUFFER_WRITE);
1179 		bufferevent_free(c->cgibev);
1180 		c->cgibev = NULL;
1181 		close(c->pfd);
1182 		c->pfd = -1;
1183 	}
1184 
1185 	bufferevent_disable(c->bev, EVBUFFER_READ|EVBUFFER_WRITE);
1186 	bufferevent_free(c->bev);
1187 	c->bev = NULL;
1188 
1189 	client_close_ev(c->fd, 0, c);
1190 }
1191 
1192 static void
1193 cgi_read(struct bufferevent *bev, void *d)
1194 {
1195 	struct client	*client = d;
1196 	struct evbuffer	*src = EVBUFFER_INPUT(bev);
1197 	char		*header;
1198 	size_t		 len;
1199 	int		 code;
1200 
1201 	/* intercept the header */
1202 	if (client->code == 0) {
1203 		header = evbuffer_readln(src, &len, EVBUFFER_EOL_CRLF_STRICT);
1204 		if (header == NULL) {
1205 			/* max reply + \r\n */
1206 			if (EVBUFFER_LENGTH(src) > 1026) {
1207 				log_warn(client, "CGI script is trying to "
1208 				    "send a header too long.");
1209 				cgi_error(bev, EVBUFFER_READ, client);
1210 			}
1211 
1212 			/* wait a bit */
1213 			return;
1214 		}
1215 
1216 		if (len < 3 || len > 1029 ||
1217 		    !isdigit(header[0]) ||
1218 		    !isdigit(header[1]) ||
1219 		    !isspace(header[2])) {
1220 			free(header);
1221 			log_warn(client, "CGI script is trying to send a "
1222 			    "malformed header");
1223 			cgi_error(bev, EVBUFFER_READ, client);
1224 			return;
1225 		}
1226 
1227 		client->header = header;
1228 		code = (header[0] - '0') * 10 + (header[1] - '0');
1229 
1230 		if (code < 10 || code >= 70) {
1231 			log_warn(client, "CGI script is trying to send an "
1232 			    "invalid reply code (%d)", code);
1233 			cgi_error(bev, EVBUFFER_READ, client);
1234 			return;
1235 		}
1236 
1237 		start_reply(client, code, header + 3);
1238 
1239 		if (client->code < 20 || client->code > 29) {
1240 			cgi_error(client->cgibev, EVBUFFER_EOF, client);
1241 			return;
1242 		}
1243 	}
1244 
1245 	bufferevent_write_buffer(client->bev, src);
1246 }
1247 
1248 static void
1249 cgi_write(struct bufferevent *bev, void *d)
1250 {
1251 	/*
1252 	 * Never called.  We don't send data to a CGI script.
1253 	 */
1254 	abort();
1255 }
1256 
1257 static void
1258 cgi_error(struct bufferevent *bev, short error, void *d)
1259 {
1260 	struct client	*client = d;
1261 
1262 	if (error & EVBUFFER_ERROR)
1263 		log_err(client, "%s: evbuffer error (%x): %s",
1264 		    __func__, error, strerror(errno));
1265 
1266 	bufferevent_disable(bev, EVBUFFER_READ|EVBUFFER_WRITE);
1267 	bufferevent_free(bev);
1268 	client->cgibev = NULL;
1269 
1270 	close(client->pfd);
1271 	client->pfd = -1;
1272 
1273 	client->type = REQUEST_DONE;
1274 	if (client->code != 0)
1275 		client_write(client->bev, client);
1276 	else
1277 		start_reply(client, CGI_ERROR, "CGI error");
1278 }
1279 
1280 static void
1281 do_accept(int sock, short et, void *d)
1282 {
1283 	struct client *c;
1284 	struct sockaddr_storage addr;
1285 	struct sockaddr *saddr;
1286 	socklen_t len;
1287 	int i, fd;
1288 
1289 	(void)et;
1290 
1291 	saddr = (struct sockaddr*)&addr;
1292 	len = sizeof(addr);
1293 	if ((fd = accept(sock, saddr, &len)) == -1) {
1294 		if (errno == EWOULDBLOCK || errno == EAGAIN)
1295 			return;
1296 		fatal("accept: %s", strerror(errno));
1297 	}
1298 
1299 	mark_nonblock(fd);
1300 
1301 	for (i = 0; i < MAX_USERS; ++i) {
1302 		c = &clients[i];
1303 		if (c->fd == -1) {
1304 			memset(c, 0, sizeof(*c));
1305 			c->id = i;
1306 			if (tls_accept_socket(ctx, &c->ctx, fd) == -1)
1307 				break; /* goodbye fd! */
1308 
1309 			c->fd = fd;
1310 			c->pfd = -1;
1311 			c->dir = NULL;
1312 			c->addr = addr;
1313 			c->fcgi = -1;
1314 
1315 			event_once(c->fd, EV_READ|EV_WRITE, handle_handshake,
1316 			    c, NULL);
1317 
1318 			connected_clients++;
1319 			return;
1320 		}
1321 	}
1322 
1323 	close(fd);
1324 }
1325 
1326 static struct client *
1327 client_by_id(int id)
1328 {
1329 	if ((size_t)id > sizeof(clients)/sizeof(clients[0]))
1330 		fatal("in client_by_id: invalid id %d", id);
1331 	return &clients[id];
1332 }
1333 
1334 struct client *
1335 try_client_by_id(int id)
1336 {
1337 	if ((size_t)id > sizeof(clients)/sizeof(clients[0]))
1338                 return NULL;
1339 	return &clients[id];
1340 }
1341 
1342 static void
1343 handle_imsg_cgi_res(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1344 {
1345 	struct client *c;
1346 
1347 	c = client_by_id(imsg->hdr.peerid);
1348 
1349 	if ((c->pfd = imsg->fd) == -1) {
1350 		start_reply(c, TEMP_FAILURE, "internal server error");
1351 		return;
1352 	}
1353 
1354 	c->type = REQUEST_CGI;
1355 
1356 	c->cgibev = bufferevent_new(c->pfd, cgi_read, cgi_write,
1357 	    cgi_error, c);
1358 
1359 	bufferevent_enable(c->cgibev, EV_READ);
1360 }
1361 
1362 static void
1363 handle_imsg_fcgi_fd(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1364 {
1365 	struct client	*c;
1366 	struct fcgi	*f;
1367 	int		 i, id;
1368 
1369 	id = imsg->hdr.peerid;
1370 	f = &fcgi[id];
1371 
1372 	if ((f->fd = imsg->fd) == -1)
1373 		f->s = FCGI_OFF;
1374 	else {
1375 		mark_nonblock(f->fd);
1376 
1377 		f->s = FCGI_READY;
1378 
1379 		f->bev = bufferevent_new(f->fd, fcgi_read, fcgi_write,
1380 		    fcgi_error, f);
1381 		if (f->bev == NULL) {
1382 			close(f->fd);
1383 			log_err(NULL, "%s: failed to allocate client buffer",
1384 			    __func__);
1385 			f->s = FCGI_OFF;
1386 		}
1387 
1388 		bufferevent_enable(f->bev, EV_READ|EV_WRITE);
1389 	}
1390 
1391 	for (i = 0; i < MAX_USERS; ++i) {
1392 		c = &clients[i];
1393 		if (c->fd == -1)
1394 			continue;
1395 		if (c->fcgi != id)
1396 			continue;
1397 
1398 		if (f->s == FCGI_OFF) {
1399 			c->fcgi = -1;
1400 			start_reply(c, TEMP_FAILURE, "internal server error");
1401 		} else
1402 			fcgi_req(f, c);
1403 	}
1404 }
1405 
1406 static void
1407 handle_imsg_quit(struct imsgbuf *ibuf, struct imsg *imsg, size_t len)
1408 {
1409 	size_t i;
1410 
1411 	(void)imsg;
1412 	(void)len;
1413 
1414 	/*
1415 	 * don't call event_loopbreak since we want to finish to
1416 	 * handle the ongoing connections.
1417 	 */
1418 
1419 	shutting_down = 1;
1420 
1421 	event_del(&e4);
1422 	if (has_ipv6)
1423 		event_del(&e6);
1424 	if (has_siginfo)
1425 		signal_del(&siginfo);
1426 	event_del(&imsgev);
1427 	signal_del(&sigusr2);
1428 
1429 	for (i = 0; i < FCGI_MAX; ++i) {
1430 		if (fcgi[i].path == NULL && fcgi[i].prog == NULL)
1431 			break;
1432 
1433 		if (fcgi[i].bev == NULL || fcgi[i].pending != 0)
1434 			continue;
1435 
1436 		fcgi_close_backend(&fcgi[i]);
1437 	}
1438 }
1439 
1440 static void
1441 handle_dispatch_imsg(int fd, short ev, void *d)
1442 {
1443 	struct imsgbuf *ibuf = d;
1444 	dispatch_imsg(ibuf, handlers, sizeof(handlers));
1445 }
1446 
1447 static void
1448 handle_siginfo(int fd, short ev, void *d)
1449 {
1450 	(void)fd;
1451 	(void)ev;
1452 	(void)d;
1453 
1454 	log_info(NULL, "%d connected clients", connected_clients);
1455 }
1456 
1457 void
1458 loop(struct tls *ctx_, int sock4, int sock6, struct imsgbuf *ibuf)
1459 {
1460 	size_t i;
1461 
1462 	ctx = ctx_;
1463 
1464 	event_init();
1465 
1466 	memset(&clients, 0, sizeof(clients));
1467 	for (i = 0; i < MAX_USERS; ++i)
1468 		clients[i].fd = -1;
1469 
1470 	event_set(&e4, sock4, EV_READ | EV_PERSIST, &do_accept, NULL);
1471 	event_add(&e4, NULL);
1472 
1473 	if (sock6 != -1) {
1474 		has_ipv6 = 1;
1475 		event_set(&e6, sock6, EV_READ | EV_PERSIST, &do_accept, NULL);
1476 		event_add(&e6, NULL);
1477 	}
1478 
1479 	event_set(&imsgev, ibuf->fd, EV_READ | EV_PERSIST, handle_dispatch_imsg, ibuf);
1480 	event_add(&imsgev, NULL);
1481 
1482 #ifdef SIGINFO
1483 	has_siginfo = 1;
1484 	signal_set(&siginfo, SIGINFO, &handle_siginfo, NULL);
1485 	signal_add(&siginfo, NULL);
1486 #endif
1487 	signal_set(&sigusr2, SIGUSR2, &handle_siginfo, NULL);
1488 	signal_add(&sigusr2, NULL);
1489 
1490 	sandbox_server_process();
1491 	event_dispatch();
1492 	_exit(0);
1493 }