1 /*
2  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/time.h>
19 #include <sys/types.h>
20 #include <sys/stat.h>
21 #include <sys/socket.h>
22 #include <sys/un.h>
23 #include <sys/wait.h>
24 
25 #include <fcntl.h>
26 #include <err.h>
27 #include <errno.h>
28 #include <event.h>
29 #include <limits.h>
30 #include <pwd.h>
31 #include <imsg.h>
32 #include <signal.h>
33 #include <siphash.h>
34 #include <stdarg.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <syslog.h>
39 #include <unistd.h>
40 
41 #include "got_error.h"
42 #include "got_opentemp.h"
43 #include "got_path.h"
44 #include "got_repository.h"
45 #include "got_object.h"
46 #include "got_reference.h"
47 
48 #include "got_lib_delta.h"
49 #include "got_lib_object.h"
50 #include "got_lib_object_cache.h"
51 #include "got_lib_hash.h"
52 #include "got_lib_gitproto.h"
53 #include "got_lib_pack.h"
54 #include "got_lib_repository.h"
55 
56 #include "gotd.h"
57 #include "log.h"
58 #include "listen.h"
59 #include "auth.h"
60 #include "session.h"
61 #include "repo_read.h"
62 #include "repo_write.h"
63 
64 #ifndef nitems
65 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
66 #endif
67 
68 enum gotd_client_state {
69 	GOTD_CLIENT_STATE_NEW,
70 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
71 };
72 
73 struct gotd_child_proc {
74 	pid_t				 pid;
75 	enum gotd_procid		 type;
76 	char				 repo_name[NAME_MAX];
77 	char				 repo_path[PATH_MAX];
78 	int				 pipe[2];
79 	struct gotd_imsgev		 iev;
80 	struct event			 tmo;
81 
82 	TAILQ_ENTRY(gotd_child_proc)	 entry;
83 };
84 TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
85 
86 struct gotd_client {
87 	STAILQ_ENTRY(gotd_client)	 entry;
88 	enum gotd_client_state		 state;
89 	uint32_t			 id;
90 	int				 fd;
91 	struct gotd_imsgev		 iev;
92 	struct event			 tmo;
93 	uid_t				 euid;
94 	gid_t				 egid;
95 	struct gotd_child_proc		*repo;
96 	struct gotd_child_proc		*auth;
97 	struct gotd_child_proc		*session;
98 	int				 required_auth;
99 };
100 STAILQ_HEAD(gotd_clients, gotd_client);
101 
102 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
103 static SIPHASH_KEY clients_hash_key;
104 volatile int client_cnt;
105 static struct timeval auth_timeout = { 5, 0 };
106 static struct gotd gotd;
107 
108 void gotd_sighdlr(int sig, short event, void *arg);
109 static void gotd_shutdown(void);
110 static const struct got_error *start_session_child(struct gotd_client *,
111     struct gotd_repo *, char *, const char *, int, int);
112 static const struct got_error *start_repo_child(struct gotd_client *,
113     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
114 static const struct got_error *start_auth_child(struct gotd_client *, int,
115     struct gotd_repo *, char *, const char *, int, int);
116 static void kill_proc(struct gotd_child_proc *, int);
117 static void disconnect(struct gotd_client *);
118 
119 __dead static void
120 usage(void)
121 {
122 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
123 	exit(1);
124 }
125 
126 static int
127 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
128 {
129 	struct sockaddr_un sun;
130 	int fd = -1;
131 	mode_t old_umask, mode;
132 
133 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
134 	if (fd == -1) {
135 		log_warn("socket");
136 		return -1;
137 	}
138 
139 	sun.sun_family = AF_UNIX;
140 	if (strlcpy(sun.sun_path, unix_socket_path,
141 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
142 		log_warnx("%s: name too long", unix_socket_path);
143 		close(fd);
144 		return -1;
145 	}
146 
147 	if (unlink(unix_socket_path) == -1) {
148 		if (errno != ENOENT) {
149 			log_warn("unlink %s", unix_socket_path);
150 			close(fd);
151 			return -1;
152 		}
153 	}
154 
155 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
156 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
157 
158 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
159 		log_warn("bind: %s", unix_socket_path);
160 		close(fd);
161 		umask(old_umask);
162 		return -1;
163 	}
164 
165 	umask(old_umask);
166 
167 	if (chmod(unix_socket_path, mode) == -1) {
168 		log_warn("chmod %o %s", mode, unix_socket_path);
169 		close(fd);
170 		unlink(unix_socket_path);
171 		return -1;
172 	}
173 
174 	if (chown(unix_socket_path, uid, gid) == -1) {
175 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
176 		close(fd);
177 		unlink(unix_socket_path);
178 		return -1;
179 	}
180 
181 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
182 		log_warn("listen");
183 		close(fd);
184 		unlink(unix_socket_path);
185 		return -1;
186 	}
187 
188 	return fd;
189 }
190 
191 static uint64_t
192 client_hash(uint32_t client_id)
193 {
194 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
195 }
196 
197 static void
198 add_client(struct gotd_client *client)
199 {
200 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
201 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
202 	client_cnt++;
203 }
204 
205 static struct gotd_client *
206 find_client(uint32_t client_id)
207 {
208 	uint64_t slot;
209 	struct gotd_client *c;
210 
211 	slot = client_hash(client_id) % nitems(gotd_clients);
212 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
213 		if (c->id == client_id)
214 			return c;
215 	}
216 
217 	return NULL;
218 }
219 
220 static struct gotd_client *
221 find_client_by_proc_fd(int fd)
222 {
223 	uint64_t slot;
224 
225 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
226 		struct gotd_client *c;
227 
228 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
229 			if (c->repo && c->repo->iev.ibuf.fd == fd)
230 				return c;
231 			if (c->auth && c->auth->iev.ibuf.fd == fd)
232 				return c;
233 			if (c->session && c->session->iev.ibuf.fd == fd)
234 				return c;
235 		}
236 	}
237 
238 	return NULL;
239 }
240 
241 static int
242 client_is_reading(struct gotd_client *client)
243 {
244 	return (client->required_auth &
245 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
246 }
247 
248 static int
249 client_is_writing(struct gotd_client *client)
250 {
251 	return (client->required_auth &
252 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
253 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
254 }
255 
256 static const struct got_error *
257 ensure_client_is_not_writing(struct gotd_client *client)
258 {
259 	if (client_is_writing(client)) {
260 		return got_error_fmt(GOT_ERR_BAD_PACKET,
261 		    "uid %d made a read-request but is writing to "
262 		    "a repository", client->euid);
263 	}
264 
265 	return NULL;
266 }
267 
268 static const struct got_error *
269 ensure_client_is_not_reading(struct gotd_client *client)
270 {
271 	if (client_is_reading(client)) {
272 		return got_error_fmt(GOT_ERR_BAD_PACKET,
273 		    "uid %d made a write-request but is reading from "
274 		    "a repository", client->euid);
275 	}
276 
277 	return NULL;
278 }
279 
280 static void
281 proc_done(struct gotd_child_proc *proc)
282 {
283 	struct gotd_client *client;
284 
285 	TAILQ_REMOVE(&procs, proc, entry);
286 
287 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
288 	if (client != NULL) {
289 		if (proc == client->repo)
290 			client->repo = NULL;
291 		if (proc == client->auth)
292 			client->auth = NULL;
293 		if (proc == client->session)
294 			client->session = NULL;
295 		disconnect(client);
296 	}
297 
298 	evtimer_del(&proc->tmo);
299 
300 	if (proc->iev.ibuf.fd != -1) {
301 		event_del(&proc->iev.ev);
302 		msgbuf_clear(&proc->iev.ibuf.w);
303 		close(proc->iev.ibuf.fd);
304 	}
305 
306 	free(proc);
307 }
308 
309 static void
310 kill_repo_proc(struct gotd_client *client)
311 {
312 	if (client->repo == NULL)
313 		return;
314 
315 	kill_proc(client->repo, 0);
316 	client->repo = NULL;
317 }
318 
319 static void
320 kill_auth_proc(struct gotd_client *client)
321 {
322 	if (client->auth == NULL)
323 		return;
324 
325 	kill_proc(client->auth, 0);
326 	client->auth = NULL;
327 }
328 
329 static void
330 kill_session_proc(struct gotd_client *client)
331 {
332 	if (client->session == NULL)
333 		return;
334 
335 	kill_proc(client->session, 0);
336 	client->session = NULL;
337 }
338 
339 static void
340 disconnect(struct gotd_client *client)
341 {
342 	struct gotd_imsg_disconnect idisconnect;
343 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
344 	uint64_t slot;
345 
346 	log_debug("uid %d: disconnecting", client->euid);
347 
348 	kill_auth_proc(client);
349 	kill_session_proc(client);
350 	kill_repo_proc(client);
351 
352 	idisconnect.client_id = client->id;
353 	if (gotd_imsg_compose_event(&listen_proc->iev,
354 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
355 	    &idisconnect, sizeof(idisconnect)) == -1)
356 		log_warn("imsg compose DISCONNECT");
357 
358 	slot = client_hash(client->id) % nitems(gotd_clients);
359 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
360 	imsg_clear(&client->iev.ibuf);
361 	event_del(&client->iev.ev);
362 	evtimer_del(&client->tmo);
363 	if (client->fd != -1)
364 		close(client->fd);
365 	else if (client->iev.ibuf.fd != -1)
366 		close(client->iev.ibuf.fd);
367 	free(client);
368 	client_cnt--;
369 }
370 
371 static void
372 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
373 {
374 	struct imsgbuf ibuf;
375 
376 	log_warnx("uid %d: %s", client->euid, err->msg);
377 	if (err->code != GOT_ERR_EOF && client->fd != -1) {
378 		imsg_init(&ibuf, client->fd);
379 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
380 		imsg_clear(&ibuf);
381 	}
382 	disconnect(client);
383 }
384 
385 static const struct got_error *
386 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
387 {
388 	const struct got_error *err = NULL;
389 	struct gotd_imsg_info_repo irepo;
390 
391 	memset(&irepo, 0, sizeof(irepo));
392 
393 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
394 	    >= sizeof(irepo.repo_name))
395 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
396 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
397 	    >= sizeof(irepo.repo_path))
398 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
399 
400 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
401 	    &irepo, sizeof(irepo)) == -1) {
402 		err = got_error_from_errno("imsg compose INFO_REPO");
403 		if (err)
404 			return err;
405 	}
406 
407 	return NULL;
408 }
409 
410 static const struct got_error *
411 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
412 {
413 	const struct got_error *err = NULL;
414 	struct gotd_imsg_info_client iclient;
415 	struct gotd_child_proc *proc;
416 
417 	memset(&iclient, 0, sizeof(iclient));
418 	iclient.euid = client->euid;
419 	iclient.egid = client->egid;
420 
421 	proc = client->repo;
422 	if (proc) {
423 		if (strlcpy(iclient.repo_name, proc->repo_path,
424 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
425 			return got_error_msg(GOT_ERR_NO_SPACE,
426 			    "repo name too long");
427 		}
428 		if (client_is_writing(client))
429 			iclient.is_writing = 1;
430 
431 		iclient.repo_child_pid = proc->pid;
432 	}
433 
434 	if (client->session)
435 		iclient.session_child_pid = client->session->pid;
436 
437 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
438 	    &iclient, sizeof(iclient)) == -1) {
439 		err = got_error_from_errno("imsg compose INFO_CLIENT");
440 		if (err)
441 			return err;
442 	}
443 
444 	return NULL;
445 }
446 
447 static const struct got_error *
448 send_info(struct gotd_client *client)
449 {
450 	const struct got_error *err = NULL;
451 	struct gotd_imsg_info info;
452 	uint64_t slot;
453 	struct gotd_repo *repo;
454 
455 	if (client->euid != 0)
456 		return got_error_set_errno(EPERM, "info");
457 
458 	info.pid = gotd.pid;
459 	info.verbosity = gotd.verbosity;
460 	info.nrepos = gotd.nrepos;
461 	info.nclients = client_cnt - 1;
462 
463 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
464 	    &info, sizeof(info)) == -1) {
465 		err = got_error_from_errno("imsg compose INFO");
466 		if (err)
467 			return err;
468 	}
469 
470 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
471 		err = send_repo_info(&client->iev, repo);
472 		if (err)
473 			return err;
474 	}
475 
476 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
477 		struct gotd_client *c;
478 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
479 			if (c->id == client->id)
480 				continue;
481 			err = send_client_info(&client->iev, c);
482 			if (err)
483 				return err;
484 		}
485 	}
486 
487 	return NULL;
488 }
489 
490 static const struct got_error *
491 stop_gotd(struct gotd_client *client)
492 {
493 
494 	if (client->euid != 0)
495 		return got_error_set_errno(EPERM, "stop");
496 
497 	gotd_shutdown();
498 	/* NOTREACHED */
499 	return NULL;
500 }
501 
502 static const struct got_error *
503 start_client_authentication(struct gotd_client *client, struct imsg *imsg)
504 {
505 	const struct got_error *err;
506 	struct gotd_imsg_list_refs ireq;
507 	struct gotd_repo *repo = NULL;
508 	size_t datalen;
509 
510 	log_debug("list-refs request from uid %d", client->euid);
511 
512 	if (client->state != GOTD_CLIENT_STATE_NEW)
513 		return got_error_msg(GOT_ERR_BAD_REQUEST,
514 		    "unexpected list-refs request received");
515 
516 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
517 	if (datalen != sizeof(ireq))
518 		return got_error(GOT_ERR_PRIVSEP_LEN);
519 
520 	memcpy(&ireq, imsg->data, datalen);
521 
522 	if (ireq.client_is_reading) {
523 		err = ensure_client_is_not_writing(client);
524 		if (err)
525 			return err;
526 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
527 		if (repo == NULL)
528 			return got_error(GOT_ERR_NOT_GIT_REPO);
529 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
530 		    gotd.argv0, gotd.confpath, gotd.daemonize,
531 		    gotd.verbosity);
532 		if (err)
533 			return err;
534 	} else {
535 		err = ensure_client_is_not_reading(client);
536 		if (err)
537 			return err;
538 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
539 		if (repo == NULL)
540 			return got_error(GOT_ERR_NOT_GIT_REPO);
541 		err = start_auth_child(client,
542 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
543 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
544 		    gotd.verbosity);
545 		if (err)
546 			return err;
547 	}
548 
549 	evtimer_add(&client->tmo, &auth_timeout);
550 
551 	/* Flow continues upon authentication success/failure or timeout. */
552 	return NULL;
553 }
554 
555 static void
556 gotd_request(int fd, short events, void *arg)
557 {
558 	struct gotd_imsgev *iev = arg;
559 	struct imsgbuf *ibuf = &iev->ibuf;
560 	struct gotd_client *client = iev->handler_arg;
561 	const struct got_error *err = NULL;
562 	struct imsg imsg;
563 	ssize_t n;
564 
565 	if (events & EV_WRITE) {
566 		while (ibuf->w.queued) {
567 			n = msgbuf_write(&ibuf->w);
568 			if (n == -1 && errno == EPIPE) {
569 				/*
570 				 * The client has closed its socket.
571 				 * This can happen when Git clients are
572 				 * done sending pack file data.
573 				 */
574 				msgbuf_clear(&ibuf->w);
575 				continue;
576 			} else if (n == -1 && errno != EAGAIN) {
577 				err = got_error_from_errno("imsg_flush");
578 				disconnect_on_error(client, err);
579 				return;
580 			}
581 			if (n == 0) {
582 				/* Connection closed. */
583 				err = got_error(GOT_ERR_EOF);
584 				disconnect_on_error(client, err);
585 				return;
586 			}
587 		}
588 
589 		/* Disconnect gotctl(8) now that messages have been sent. */
590 		if (!client_is_reading(client) && !client_is_writing(client)) {
591 			disconnect(client);
592 			return;
593 		}
594 	}
595 
596 	if ((events & EV_READ) == 0)
597 		return;
598 
599 	memset(&imsg, 0, sizeof(imsg));
600 
601 	while (err == NULL) {
602 		err = gotd_imsg_recv(&imsg, ibuf, 0);
603 		if (err) {
604 			if (err->code == GOT_ERR_PRIVSEP_READ)
605 				err = NULL;
606 			break;
607 		}
608 
609 		evtimer_del(&client->tmo);
610 
611 		switch (imsg.hdr.type) {
612 		case GOTD_IMSG_INFO:
613 			err = send_info(client);
614 			break;
615 		case GOTD_IMSG_STOP:
616 			err = stop_gotd(client);
617 			break;
618 		case GOTD_IMSG_LIST_REFS:
619 			err = start_client_authentication(client, &imsg);
620 			break;
621 		default:
622 			log_debug("unexpected imsg %d", imsg.hdr.type);
623 			err = got_error(GOT_ERR_PRIVSEP_MSG);
624 			break;
625 		}
626 
627 		imsg_free(&imsg);
628 	}
629 
630 	if (err) {
631 		disconnect_on_error(client, err);
632 	} else {
633 		gotd_imsg_event_add(&client->iev);
634 	}
635 }
636 
637 static void
638 gotd_auth_timeout(int fd, short events, void *arg)
639 {
640 	struct gotd_client *client = arg;
641 
642 	log_debug("disconnecting uid %d due to authentication timeout",
643 	    client->euid);
644 	disconnect(client);
645 }
646 
647 static const struct got_error *
648 recv_connect(uint32_t *client_id, struct imsg *imsg)
649 {
650 	const struct got_error *err = NULL;
651 	struct gotd_imsg_connect iconnect;
652 	size_t datalen;
653 	int s = -1;
654 	struct gotd_client *client = NULL;
655 
656 	*client_id = 0;
657 
658 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
659 	if (datalen != sizeof(iconnect))
660 		return got_error(GOT_ERR_PRIVSEP_LEN);
661 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
662 
663 	s = imsg->fd;
664 	if (s == -1) {
665 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
666 		goto done;
667 	}
668 
669 	if (find_client(iconnect.client_id)) {
670 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
671 		goto done;
672 	}
673 
674 	client = calloc(1, sizeof(*client));
675 	if (client == NULL) {
676 		err = got_error_from_errno("calloc");
677 		goto done;
678 	}
679 
680 	*client_id = iconnect.client_id;
681 
682 	client->state = GOTD_CLIENT_STATE_NEW;
683 	client->id = iconnect.client_id;
684 	client->fd = s;
685 	s = -1;
686 	/* The auth process will verify UID/GID for us. */
687 	client->euid = iconnect.euid;
688 	client->egid = iconnect.egid;
689 
690 	imsg_init(&client->iev.ibuf, client->fd);
691 	client->iev.handler = gotd_request;
692 	client->iev.events = EV_READ;
693 	client->iev.handler_arg = client;
694 
695 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
696 	    &client->iev);
697 	gotd_imsg_event_add(&client->iev);
698 
699 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
700 
701 	add_client(client);
702 	log_debug("%s: new client uid %d connected on fd %d", __func__,
703 	    client->euid, client->fd);
704 done:
705 	if (err) {
706 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
707 		struct gotd_imsg_disconnect idisconnect;
708 
709 		idisconnect.client_id = client->id;
710 		if (gotd_imsg_compose_event(&listen_proc->iev,
711 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
712 		    &idisconnect, sizeof(idisconnect)) == -1)
713 			log_warn("imsg compose DISCONNECT");
714 
715 		if (s != -1)
716 			close(s);
717 	}
718 
719 	return err;
720 }
721 
722 static const char *gotd_proc_names[PROC_MAX] = {
723 	"parent",
724 	"listen",
725 	"auth",
726 	"session_read",
727 	"session_write",
728 	"repo_read",
729 	"repo_write",
730 	"gitwrapper"
731 };
732 
733 static void
734 kill_proc(struct gotd_child_proc *proc, int fatal)
735 {
736 	struct timeval tv = { 5, 0 };
737 
738 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
739 
740 	if (proc->iev.ibuf.fd != -1) {
741 		event_del(&proc->iev.ev);
742 		msgbuf_clear(&proc->iev.ibuf.w);
743 		close(proc->iev.ibuf.fd);
744 		proc->iev.ibuf.fd = -1;
745 	}
746 
747 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
748 		evtimer_add(&proc->tmo, &tv);
749 
750 	if (fatal) {
751 		log_warnx("sending SIGKILL to PID %d", proc->pid);
752 		kill(proc->pid, SIGKILL);
753 	} else
754 		kill(proc->pid, SIGTERM);
755 }
756 
757 static void
758 kill_proc_timeout(int fd, short ev, void *d)
759 {
760 	struct gotd_child_proc *proc = d;
761 
762 	log_warnx("timeout waiting for PID %d to terminate;"
763 	    " retrying with force", proc->pid);
764 	kill_proc(proc, 1);
765 }
766 
767 static void
768 gotd_shutdown(void)
769 {
770 	uint64_t slot;
771 
772 	log_debug("shutting down");
773 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
774 		struct gotd_client *c, *tmp;
775 
776 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
777 			disconnect(c);
778 	}
779 
780 	kill_proc(gotd.listen_proc, 0);
781 
782 	log_info("terminating");
783 	exit(0);
784 }
785 
786 static struct gotd_child_proc *
787 find_proc_by_pid(pid_t pid)
788 {
789 	struct gotd_child_proc *proc = NULL;
790 
791 	TAILQ_FOREACH(proc, &procs, entry)
792 		if (proc->pid == pid)
793 			break;
794 
795 	return proc;
796 }
797 
798 void
799 gotd_sighdlr(int sig, short event, void *arg)
800 {
801 	struct gotd_child_proc *proc;
802 	pid_t pid;
803 	int status;
804 
805 	/*
806 	 * Normal signal handler rules don't apply because libevent
807 	 * decouples for us.
808 	 */
809 
810 	switch (sig) {
811 	case SIGHUP:
812 		log_info("%s: ignoring SIGHUP", __func__);
813 		break;
814 	case SIGUSR1:
815 		log_info("%s: ignoring SIGUSR1", __func__);
816 		break;
817 	case SIGTERM:
818 	case SIGINT:
819 		gotd_shutdown();
820 		break;
821 	case SIGCHLD:
822 		for (;;) {
823 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
824 			if (pid == -1) {
825 				if (errno == EINTR)
826 					continue;
827 				if (errno == ECHILD)
828 					break;
829 				fatal("waitpid");
830 			}
831 			if (pid == 0)
832 				break;
833 
834 			log_debug("reaped pid %d", pid);
835 			proc = find_proc_by_pid(pid);
836 			if (proc == NULL) {
837 				log_info("caught exit of unknown child %d",
838 				    pid);
839 				continue;
840 			}
841 
842 			if (WIFSIGNALED(status)) {
843 				log_warnx("child PID %d terminated with"
844 				    " signal %d", pid, WTERMSIG(status));
845 			}
846 
847 			proc_done(proc);
848 		}
849 		break;
850 	default:
851 		fatalx("unexpected signal");
852 	}
853 }
854 
855 static const struct got_error *
856 ensure_proc_is_reading(struct gotd_client *client,
857     struct gotd_child_proc *proc)
858 {
859 	if (!client_is_reading(client)) {
860 		kill_proc(proc, 1);
861 		return got_error_fmt(GOT_ERR_BAD_PACKET,
862 		    "PID %d handled a read-request for uid %d but this "
863 		    "user is not reading from a repository", proc->pid,
864 		    client->euid);
865 	}
866 
867 	return NULL;
868 }
869 
870 static const struct got_error *
871 ensure_proc_is_writing(struct gotd_client *client,
872     struct gotd_child_proc *proc)
873 {
874 	if (!client_is_writing(client)) {
875 		kill_proc(proc, 1);
876 		return got_error_fmt(GOT_ERR_BAD_PACKET,
877 		    "PID %d handled a write-request for uid %d but this "
878 		    "user is not writing to a repository", proc->pid,
879 		    client->euid);
880 	}
881 
882 	return NULL;
883 }
884 
885 static int
886 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
887     struct imsg *imsg)
888 {
889 	const struct got_error *err;
890 	int ret = 0;
891 
892 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
893 		if (client->repo == NULL)
894 			fatalx("no process found for uid %d", client->euid);
895 		if (proc->pid != client->repo->pid) {
896 			kill_proc(proc, 1);
897 			log_warnx("received message from PID %d for uid %d, "
898 			    "while PID %d is the process serving this user",
899 			    proc->pid, client->euid, client->repo->pid);
900 			return 0;
901 		}
902 	}
903 	if (proc->type == PROC_SESSION_READ ||
904 	    proc->type == PROC_SESSION_WRITE) {
905 		if (client->session == NULL) {
906 			log_warnx("no session found for uid %d", client->euid);
907 			return 0;
908 		}
909 		if (proc->pid != client->session->pid) {
910 			kill_proc(proc, 1);
911 			log_warnx("received message from PID %d for uid %d, "
912 			    "while PID %d is the process serving this user",
913 			    proc->pid, client->euid, client->session->pid);
914 			return 0;
915 		}
916 	}
917 
918 	switch (imsg->hdr.type) {
919 	case GOTD_IMSG_ERROR:
920 		ret = 1;
921 		break;
922 	case GOTD_IMSG_CONNECT:
923 		if (proc->type != PROC_LISTEN) {
924 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
925 			    "new connection for uid %d from PID %d "
926 			    "which is not the listen process",
927 			    proc->pid, client->euid);
928 		} else
929 			ret = 1;
930 		break;
931 	case GOTD_IMSG_ACCESS_GRANTED:
932 		if (proc->type != PROC_AUTH) {
933 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
934 			    "authentication of uid %d from PID %d "
935 			    "which is not the auth process",
936 			    proc->pid, client->euid);
937 		} else
938 			ret = 1;
939 		break;
940 	case GOTD_IMSG_CLIENT_SESSION_READY:
941 		if (proc->type != PROC_SESSION_READ &&
942 		    proc->type != PROC_SESSION_WRITE) {
943 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
944 			    "unexpected \"ready\" signal from PID %d",
945 			    proc->pid);
946 		} else
947 			ret = 1;
948 		break;
949 	case GOTD_IMSG_REPO_CHILD_READY:
950 		if (proc->type != PROC_REPO_READ &&
951 		    proc->type != PROC_REPO_WRITE) {
952 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
953 			    "unexpected \"ready\" signal from PID %d",
954 			    proc->pid);
955 		} else
956 			ret = 1;
957 		break;
958 	case GOTD_IMSG_PACKFILE_DONE:
959 		err = ensure_proc_is_reading(client, proc);
960 		if (err)
961 			log_warnx("uid %d: %s", client->euid, err->msg);
962 		else
963 			ret = 1;
964 		break;
965 	case GOTD_IMSG_PACKFILE_INSTALL:
966 	case GOTD_IMSG_REF_UPDATES_START:
967 	case GOTD_IMSG_REF_UPDATE:
968 		err = ensure_proc_is_writing(client, proc);
969 		if (err)
970 			log_warnx("uid %d: %s", client->euid, err->msg);
971 		else
972 			ret = 1;
973 		break;
974 	default:
975 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
976 		break;
977 	}
978 
979 	return ret;
980 }
981 
982 static const struct got_error *
983 connect_repo_child(struct gotd_client *client,
984     struct gotd_child_proc *repo_proc)
985 {
986 	static const struct got_error *err;
987 	struct gotd_imsgev *session_iev = &client->session->iev;
988 	struct gotd_imsg_connect_repo_child ireq;
989 	int pipe[2];
990 
991 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
992 		return got_error_msg(GOT_ERR_BAD_REQUEST,
993 		    "unexpected repo child ready signal received");
994 
995 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
996 	    PF_UNSPEC, pipe) == -1)
997 		fatal("socketpair");
998 
999 	memset(&ireq, 0, sizeof(ireq));
1000 	ireq.client_id = client->id;
1001 	ireq.proc_id = repo_proc->type;
1002 
1003 	/* Pass repo child pipe to session child process. */
1004 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1005 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1006 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1007 		close(pipe[0]);
1008 		close(pipe[1]);
1009 		return err;
1010 	}
1011 
1012 	/* Pass session child pipe to repo child process. */
1013 	if (gotd_imsg_compose_event(&repo_proc->iev,
1014 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1015 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1016 		close(pipe[1]);
1017 		return err;
1018 	}
1019 
1020 	return NULL;
1021 }
1022 
1023 static void
1024 gotd_dispatch_listener(int fd, short event, void *arg)
1025 {
1026 	struct gotd_imsgev *iev = arg;
1027 	struct imsgbuf *ibuf = &iev->ibuf;
1028 	struct gotd_child_proc *proc = gotd.listen_proc;
1029 	ssize_t n;
1030 	int shut = 0;
1031 	struct imsg imsg;
1032 
1033 	if (proc->iev.ibuf.fd != fd)
1034 		fatalx("%s: unexpected fd %d", __func__, fd);
1035 
1036 	if (event & EV_READ) {
1037 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1038 			fatal("imsg_read error");
1039 		if (n == 0) {
1040 			/* Connection closed. */
1041 			shut = 1;
1042 			goto done;
1043 		}
1044 	}
1045 
1046 	if (event & EV_WRITE) {
1047 		n = msgbuf_write(&ibuf->w);
1048 		if (n == -1 && errno != EAGAIN)
1049 			fatal("msgbuf_write");
1050 		if (n == 0) {
1051 			/* Connection closed. */
1052 			shut = 1;
1053 			goto done;
1054 		}
1055 	}
1056 
1057 	for (;;) {
1058 		const struct got_error *err = NULL;
1059 		struct gotd_client *client = NULL;
1060 		uint32_t client_id = 0;
1061 		int do_disconnect = 0;
1062 
1063 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1064 			fatal("%s: imsg_get error", __func__);
1065 		if (n == 0)	/* No more messages. */
1066 			break;
1067 
1068 		switch (imsg.hdr.type) {
1069 		case GOTD_IMSG_ERROR:
1070 			do_disconnect = 1;
1071 			err = gotd_imsg_recv_error(&client_id, &imsg);
1072 			break;
1073 		case GOTD_IMSG_CONNECT:
1074 			err = recv_connect(&client_id, &imsg);
1075 			break;
1076 		default:
1077 			log_debug("unexpected imsg %d", imsg.hdr.type);
1078 			break;
1079 		}
1080 
1081 		client = find_client(client_id);
1082 		if (client == NULL) {
1083 			log_warnx("%s: client not found", __func__);
1084 			imsg_free(&imsg);
1085 			continue;
1086 		}
1087 
1088 		if (err)
1089 			log_warnx("uid %d: %s", client->euid, err->msg);
1090 
1091 		if (do_disconnect) {
1092 			if (err)
1093 				disconnect_on_error(client, err);
1094 			else
1095 				disconnect(client);
1096 		}
1097 
1098 		imsg_free(&imsg);
1099 	}
1100 done:
1101 	if (!shut) {
1102 		gotd_imsg_event_add(iev);
1103 	} else {
1104 		/* This pipe is dead. Remove its event handler */
1105 		event_del(&iev->ev);
1106 		event_loopexit(NULL);
1107 	}
1108 }
1109 
1110 static void
1111 gotd_dispatch_auth_child(int fd, short event, void *arg)
1112 {
1113 	const struct got_error *err = NULL;
1114 	struct gotd_imsgev *iev = arg;
1115 	struct imsgbuf *ibuf = &iev->ibuf;
1116 	struct gotd_client *client;
1117 	struct gotd_repo *repo = NULL;
1118 	ssize_t n;
1119 	int shut = 0;
1120 	struct imsg imsg;
1121 	uint32_t client_id = 0;
1122 	int do_disconnect = 0;
1123 
1124 	client = find_client_by_proc_fd(fd);
1125 	if (client == NULL) {
1126 		/* Can happen during process teardown. */
1127 		warnx("cannot find client for fd %d", fd);
1128 		shut = 1;
1129 		goto done;
1130 	}
1131 
1132 	if (client->auth == NULL)
1133 		fatalx("cannot find auth child process for fd %d", fd);
1134 
1135 	if (event & EV_READ) {
1136 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1137 			fatal("imsg_read error");
1138 		if (n == 0) {
1139 			/* Connection closed. */
1140 			shut = 1;
1141 			goto done;
1142 		}
1143 	}
1144 
1145 	if (event & EV_WRITE) {
1146 		n = msgbuf_write(&ibuf->w);
1147 		if (n == -1 && errno != EAGAIN)
1148 			fatal("msgbuf_write");
1149 		if (n == 0) {
1150 			/* Connection closed. */
1151 			shut = 1;
1152 		}
1153 		goto done;
1154 	}
1155 
1156 	if (client->auth->iev.ibuf.fd != fd)
1157 		fatalx("%s: unexpected fd %d", __func__, fd);
1158 
1159 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1160 		fatal("%s: imsg_get error", __func__);
1161 	if (n == 0)	/* No more messages. */
1162 		return;
1163 
1164 	evtimer_del(&client->tmo);
1165 
1166 	switch (imsg.hdr.type) {
1167 	case GOTD_IMSG_ERROR:
1168 		do_disconnect = 1;
1169 		err = gotd_imsg_recv_error(&client_id, &imsg);
1170 		break;
1171 	case GOTD_IMSG_ACCESS_GRANTED:
1172 		client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1173 		break;
1174 	default:
1175 		do_disconnect = 1;
1176 		log_debug("unexpected imsg %d", imsg.hdr.type);
1177 		break;
1178 	}
1179 
1180 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1181 		do_disconnect = 1;
1182 		log_debug("dropping imsg type %d from PID %d",
1183 		    imsg.hdr.type, client->auth->pid);
1184 	}
1185 	imsg_free(&imsg);
1186 
1187 	if (do_disconnect) {
1188 		if (err)
1189 			disconnect_on_error(client, err);
1190 		else
1191 			disconnect(client);
1192 		return;
1193 	}
1194 
1195 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1196 	if (repo == NULL) {
1197 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1198 		goto done;
1199 	}
1200 	kill_auth_proc(client);
1201 
1202 	log_info("authenticated uid %d for repository %s",
1203 	    client->euid, repo->name);
1204 
1205 	err = start_session_child(client, repo, gotd.argv0,
1206 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1207 	if (err)
1208 		goto done;
1209 done:
1210 	if (err)
1211 		log_warnx("uid %d: %s", client->euid, err->msg);
1212 
1213 	/* We might have killed the auth process by now. */
1214 	if (client->auth != NULL) {
1215 		if (!shut) {
1216 			gotd_imsg_event_add(iev);
1217 		} else {
1218 			/* This pipe is dead. Remove its event handler */
1219 			event_del(&iev->ev);
1220 		}
1221 	}
1222 }
1223 
1224 static const struct got_error *
1225 connect_session(struct gotd_client *client)
1226 {
1227 	const struct got_error *err = NULL;
1228 	struct gotd_imsg_connect iconnect;
1229 	int s;
1230 
1231 	memset(&iconnect, 0, sizeof(iconnect));
1232 
1233 	s = dup(client->fd);
1234 	if (s == -1)
1235 		return got_error_from_errno("dup");
1236 
1237 	iconnect.client_id = client->id;
1238 	iconnect.euid = client->euid;
1239 	iconnect.egid = client->egid;
1240 
1241 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1242 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1243 		err = got_error_from_errno("imsg compose CONNECT");
1244 		close(s);
1245 		return err;
1246 	}
1247 
1248 	/*
1249 	 * We are no longer interested in messages from this client.
1250 	 * Further client requests will be handled by the session process.
1251 	 */
1252 	msgbuf_clear(&client->iev.ibuf.w);
1253 	imsg_clear(&client->iev.ibuf);
1254 	event_del(&client->iev.ev);
1255 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1256 
1257 	return NULL;
1258 }
1259 
1260 static void
1261 gotd_dispatch_client_session(int fd, short event, void *arg)
1262 {
1263 	struct gotd_imsgev *iev = arg;
1264 	struct imsgbuf *ibuf = &iev->ibuf;
1265 	struct gotd_child_proc *proc = NULL;
1266 	struct gotd_client *client = NULL;
1267 	ssize_t n;
1268 	int shut = 0;
1269 	struct imsg imsg;
1270 
1271 	client = find_client_by_proc_fd(fd);
1272 	if (client == NULL) {
1273 		/* Can happen during process teardown. */
1274 		warnx("cannot find client for fd %d", fd);
1275 		shut = 1;
1276 		goto done;
1277 	}
1278 
1279 	if (event & EV_READ) {
1280 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1281 			fatal("imsg_read error");
1282 		if (n == 0) {
1283 			/* Connection closed. */
1284 			shut = 1;
1285 			goto done;
1286 		}
1287 	}
1288 
1289 	if (event & EV_WRITE) {
1290 		n = msgbuf_write(&ibuf->w);
1291 		if (n == -1 && errno != EAGAIN)
1292 			fatal("msgbuf_write");
1293 		if (n == 0) {
1294 			/* Connection closed. */
1295 			shut = 1;
1296 			goto done;
1297 		}
1298 	}
1299 
1300 	proc = client->session;
1301 	if (proc == NULL)
1302 		fatalx("cannot find session child process for fd %d", fd);
1303 
1304 	for (;;) {
1305 		const struct got_error *err = NULL;
1306 		uint32_t client_id = 0;
1307 		int do_disconnect = 0, do_start_repo_child = 0;
1308 
1309 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1310 			fatal("%s: imsg_get error", __func__);
1311 		if (n == 0)	/* No more messages. */
1312 			break;
1313 
1314 		switch (imsg.hdr.type) {
1315 		case GOTD_IMSG_ERROR:
1316 			do_disconnect = 1;
1317 			err = gotd_imsg_recv_error(&client_id, &imsg);
1318 			break;
1319 		case GOTD_IMSG_CLIENT_SESSION_READY:
1320 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1321 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1322 				break;
1323 			}
1324 			do_start_repo_child = 1;
1325 			break;
1326 		case GOTD_IMSG_DISCONNECT:
1327 			do_disconnect = 1;
1328 			break;
1329 		default:
1330 			log_debug("unexpected imsg %d", imsg.hdr.type);
1331 			break;
1332 		}
1333 
1334 		if (!verify_imsg_src(client, proc, &imsg)) {
1335 			log_debug("dropping imsg type %d from PID %d",
1336 			    imsg.hdr.type, proc->pid);
1337 			imsg_free(&imsg);
1338 			continue;
1339 		}
1340 		if (err)
1341 			log_warnx("uid %d: %s", client->euid, err->msg);
1342 
1343 		if (do_start_repo_child) {
1344 			struct gotd_repo *repo;
1345 			const char *name = client->session->repo_name;
1346 
1347 			repo = gotd_find_repo_by_name(name, &gotd);
1348 			if (repo != NULL) {
1349 				enum gotd_procid proc_type;
1350 
1351 				if (client->required_auth & GOTD_AUTH_WRITE)
1352 					proc_type = PROC_REPO_WRITE;
1353 				else
1354 					proc_type = PROC_REPO_READ;
1355 
1356 				err = start_repo_child(client, proc_type, repo,
1357 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1358 				    gotd.verbosity);
1359 			} else
1360 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1361 
1362 			if (err) {
1363 				log_warnx("uid %d: %s", client->euid, err->msg);
1364 				do_disconnect = 1;
1365 			}
1366 		}
1367 
1368 		if (do_disconnect) {
1369 			if (err)
1370 				disconnect_on_error(client, err);
1371 			else
1372 				disconnect(client);
1373 		}
1374 
1375 		imsg_free(&imsg);
1376 	}
1377 done:
1378 	if (!shut) {
1379 		gotd_imsg_event_add(iev);
1380 	} else {
1381 		/* This pipe is dead. Remove its event handler */
1382 		event_del(&iev->ev);
1383 		disconnect(client);
1384 	}
1385 }
1386 
1387 static void
1388 gotd_dispatch_repo_child(int fd, short event, void *arg)
1389 {
1390 	struct gotd_imsgev *iev = arg;
1391 	struct imsgbuf *ibuf = &iev->ibuf;
1392 	struct gotd_child_proc *proc = NULL;
1393 	struct gotd_client *client;
1394 	ssize_t n;
1395 	int shut = 0;
1396 	struct imsg imsg;
1397 
1398 	client = find_client_by_proc_fd(fd);
1399 	if (client == NULL) {
1400 		/* Can happen during process teardown. */
1401 		warnx("cannot find client for fd %d", fd);
1402 		shut = 1;
1403 		goto done;
1404 	}
1405 
1406 	if (event & EV_READ) {
1407 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1408 			fatal("imsg_read error");
1409 		if (n == 0) {
1410 			/* Connection closed. */
1411 			shut = 1;
1412 			goto done;
1413 		}
1414 	}
1415 
1416 	if (event & EV_WRITE) {
1417 		n = msgbuf_write(&ibuf->w);
1418 		if (n == -1 && errno != EAGAIN)
1419 			fatal("msgbuf_write");
1420 		if (n == 0) {
1421 			/* Connection closed. */
1422 			shut = 1;
1423 			goto done;
1424 		}
1425 	}
1426 
1427 	proc = client->repo;
1428 	if (proc == NULL)
1429 		fatalx("cannot find child process for fd %d", fd);
1430 
1431 	for (;;) {
1432 		const struct got_error *err = NULL;
1433 		uint32_t client_id = 0;
1434 		int do_disconnect = 0;
1435 
1436 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1437 			fatal("%s: imsg_get error", __func__);
1438 		if (n == 0)	/* No more messages. */
1439 			break;
1440 
1441 		switch (imsg.hdr.type) {
1442 		case GOTD_IMSG_ERROR:
1443 			do_disconnect = 1;
1444 			err = gotd_imsg_recv_error(&client_id, &imsg);
1445 			break;
1446 		case GOTD_IMSG_REPO_CHILD_READY:
1447 			err = connect_session(client);
1448 			if (err)
1449 				break;
1450 			err = connect_repo_child(client, proc);
1451 			break;
1452 		default:
1453 			log_debug("unexpected imsg %d", imsg.hdr.type);
1454 			break;
1455 		}
1456 
1457 		if (!verify_imsg_src(client, proc, &imsg)) {
1458 			log_debug("dropping imsg type %d from PID %d",
1459 			    imsg.hdr.type, proc->pid);
1460 			imsg_free(&imsg);
1461 			continue;
1462 		}
1463 		if (err)
1464 			log_warnx("uid %d: %s", client->euid, err->msg);
1465 
1466 		if (do_disconnect) {
1467 			if (err)
1468 				disconnect_on_error(client, err);
1469 			else
1470 				disconnect(client);
1471 		}
1472 
1473 		imsg_free(&imsg);
1474 	}
1475 done:
1476 	if (!shut) {
1477 		gotd_imsg_event_add(iev);
1478 	} else {
1479 		/* This pipe is dead. Remove its event handler */
1480 		event_del(&iev->ev);
1481 		disconnect(client);
1482 	}
1483 }
1484 
1485 static pid_t
1486 start_child(enum gotd_procid proc_id, const char *repo_path,
1487     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1488 {
1489 	char	*argv[11];
1490 	int	 argc = 0;
1491 	pid_t	 pid;
1492 
1493 	switch (pid = fork()) {
1494 	case -1:
1495 		fatal("cannot fork");
1496 	case 0:
1497 		break;
1498 	default:
1499 		close(fd);
1500 		return pid;
1501 	}
1502 
1503 	if (fd != GOTD_FILENO_MSG_PIPE) {
1504 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1505 			fatal("cannot setup imsg fd");
1506 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1507 		fatal("cannot setup imsg fd");
1508 
1509 	argv[argc++] = argv0;
1510 	switch (proc_id) {
1511 	case PROC_LISTEN:
1512 		argv[argc++] = (char *)"-L";
1513 		break;
1514 	case PROC_AUTH:
1515 		argv[argc++] = (char *)"-A";
1516 		break;
1517 	case PROC_SESSION_READ:
1518 		argv[argc++] = (char *)"-s";
1519 		break;
1520 	case PROC_SESSION_WRITE:
1521 		argv[argc++] = (char *)"-S";
1522 		break;
1523 	case PROC_REPO_READ:
1524 		argv[argc++] = (char *)"-R";
1525 		break;
1526 	case PROC_REPO_WRITE:
1527 		argv[argc++] = (char *)"-W";
1528 		break;
1529 	default:
1530 		fatalx("invalid process id %d", proc_id);
1531 	}
1532 
1533 	argv[argc++] = (char *)"-f";
1534 	argv[argc++] = (char *)confpath;
1535 
1536 	if (repo_path) {
1537 		argv[argc++] = (char *)"-P";
1538 		argv[argc++] = (char *)repo_path;
1539 	}
1540 
1541 	if (!daemonize)
1542 		argv[argc++] = (char *)"-d";
1543 	if (verbosity > 0)
1544 		argv[argc++] = (char *)"-v";
1545 	if (verbosity > 1)
1546 		argv[argc++] = (char *)"-v";
1547 	argv[argc++] = NULL;
1548 
1549 	execvp(argv0, argv);
1550 	fatal("execvp");
1551 }
1552 
1553 static void
1554 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1555 {
1556 	struct gotd_child_proc *proc;
1557 
1558 	proc = calloc(1, sizeof(*proc));
1559 	if (proc == NULL)
1560 		fatal("calloc");
1561 
1562 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1563 
1564 	/* proc->tmo is initialized in main() after event_init() */
1565 
1566 	proc->type = PROC_LISTEN;
1567 
1568 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1569 	    PF_UNSPEC, proc->pipe) == -1)
1570 		fatal("socketpair");
1571 
1572 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1573 	    proc->pipe[1], daemonize, verbosity);
1574 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1575 	proc->iev.handler = gotd_dispatch_listener;
1576 	proc->iev.events = EV_READ;
1577 	proc->iev.handler_arg = NULL;
1578 
1579 	gotd.listen_proc = proc;
1580 }
1581 
1582 static const struct got_error *
1583 start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1584     char *argv0, const char *confpath, int daemonize, int verbosity)
1585 {
1586 	struct gotd_child_proc *proc;
1587 
1588 	proc = calloc(1, sizeof(*proc));
1589 	if (proc == NULL)
1590 		return got_error_from_errno("calloc");
1591 
1592 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1593 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1594 
1595 	if (client_is_reading(client))
1596 		proc->type = PROC_SESSION_READ;
1597 	else
1598 		proc->type = PROC_SESSION_WRITE;
1599 	if (strlcpy(proc->repo_name, repo->name,
1600 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1601 		fatalx("repository name too long: %s", repo->name);
1602 	log_debug("starting client uid %d session for repository %s",
1603 	    client->euid, repo->name);
1604 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1605 	    sizeof(proc->repo_path))
1606 		fatalx("repository path too long: %s", repo->path);
1607 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1608 	    PF_UNSPEC, proc->pipe) == -1)
1609 		fatal("socketpair");
1610 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1611 	    confpath, proc->pipe[1], daemonize, verbosity);
1612 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1613 	log_debug("proc %s %s is on fd %d",
1614 	    gotd_proc_names[proc->type], proc->repo_path,
1615 	    proc->pipe[0]);
1616 	proc->iev.handler = gotd_dispatch_client_session;
1617 	proc->iev.events = EV_READ;
1618 	proc->iev.handler_arg = NULL;
1619 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1620 	    gotd_dispatch_client_session, &proc->iev);
1621 	gotd_imsg_event_add(&proc->iev);
1622 
1623 	client->session = proc;
1624 	return NULL;
1625 }
1626 
1627 static const struct got_error *
1628 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1629     struct gotd_repo *repo, char *argv0, const char *confpath,
1630     int daemonize, int verbosity)
1631 {
1632 	struct gotd_child_proc *proc;
1633 
1634 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1635 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1636 
1637 	proc = calloc(1, sizeof(*proc));
1638 	if (proc == NULL)
1639 		return got_error_from_errno("calloc");
1640 
1641 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1642 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1643 
1644 	proc->type = proc_type;
1645 	if (strlcpy(proc->repo_name, repo->name,
1646 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1647 		fatalx("repository name too long: %s", repo->name);
1648 	log_debug("starting %s for repository %s",
1649 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1650 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1651 	    sizeof(proc->repo_path))
1652 		fatalx("repository path too long: %s", repo->path);
1653 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1654 	    PF_UNSPEC, proc->pipe) == -1)
1655 		fatal("socketpair");
1656 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1657 	    confpath, proc->pipe[1], daemonize, verbosity);
1658 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1659 	log_debug("proc %s %s is on fd %d",
1660 	    gotd_proc_names[proc->type], proc->repo_path,
1661 	    proc->pipe[0]);
1662 	proc->iev.handler = gotd_dispatch_repo_child;
1663 	proc->iev.events = EV_READ;
1664 	proc->iev.handler_arg = NULL;
1665 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1666 	    gotd_dispatch_repo_child, &proc->iev);
1667 	gotd_imsg_event_add(&proc->iev);
1668 
1669 	client->repo = proc;
1670 	return NULL;
1671 }
1672 
1673 static const struct got_error *
1674 start_auth_child(struct gotd_client *client, int required_auth,
1675     struct gotd_repo *repo, char *argv0, const char *confpath,
1676     int daemonize, int verbosity)
1677 {
1678 	const struct got_error *err = NULL;
1679 	struct gotd_child_proc *proc;
1680 	struct gotd_imsg_auth iauth;
1681 	int fd;
1682 
1683 	memset(&iauth, 0, sizeof(iauth));
1684 
1685 	fd = dup(client->fd);
1686 	if (fd == -1)
1687 		return got_error_from_errno("dup");
1688 
1689 	proc = calloc(1, sizeof(*proc));
1690 	if (proc == NULL) {
1691 		err = got_error_from_errno("calloc");
1692 		close(fd);
1693 		return err;
1694 	}
1695 
1696 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1697 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1698 
1699 	proc->type = PROC_AUTH;
1700 	if (strlcpy(proc->repo_name, repo->name,
1701 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1702 		fatalx("repository name too long: %s", repo->name);
1703 	log_debug("starting auth for uid %d repository %s",
1704 	    client->euid, repo->name);
1705 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1706 	    sizeof(proc->repo_path))
1707 		fatalx("repository path too long: %s", repo->path);
1708 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1709 	    PF_UNSPEC, proc->pipe) == -1)
1710 		fatal("socketpair");
1711 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1712 	    confpath, proc->pipe[1], daemonize, verbosity);
1713 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1714 	log_debug("proc %s %s is on fd %d",
1715 	    gotd_proc_names[proc->type], proc->repo_path,
1716 	    proc->pipe[0]);
1717 	proc->iev.handler = gotd_dispatch_auth_child;
1718 	proc->iev.events = EV_READ;
1719 	proc->iev.handler_arg = NULL;
1720 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1721 	    gotd_dispatch_auth_child, &proc->iev);
1722 	gotd_imsg_event_add(&proc->iev);
1723 
1724 	iauth.euid = client->euid;
1725 	iauth.egid = client->egid;
1726 	iauth.required_auth = required_auth;
1727 	iauth.client_id = client->id;
1728 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1729 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1730 		log_warn("imsg compose AUTHENTICATE");
1731 		close(fd);
1732 		/* Let the auth_timeout handler tidy up. */
1733 	}
1734 
1735 	client->auth = proc;
1736 	client->required_auth = required_auth;
1737 	return NULL;
1738 }
1739 
1740 static void
1741 apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1742 {
1743 	if (need_tmpdir) {
1744 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1745 			fatal("unveil %s", GOT_TMPDIR_STR);
1746 	}
1747 
1748 	if (unveil(repo_path, "r") == -1)
1749 		fatal("unveil %s", repo_path);
1750 
1751 	if (unveil(NULL, NULL) == -1)
1752 		fatal("unveil");
1753 }
1754 
1755 static void
1756 apply_unveil_repo_readwrite(const char *repo_path)
1757 {
1758 	if (unveil(repo_path, "rwc") == -1)
1759 		fatal("unveil %s", repo_path);
1760 
1761 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1762 		fatal("unveil %s", GOT_TMPDIR_STR);
1763 
1764 	if (unveil(NULL, NULL) == -1)
1765 		fatal("unveil");
1766 }
1767 
1768 static void
1769 apply_unveil_none(void)
1770 {
1771 	if (unveil("/", "") == -1)
1772 		fatal("unveil");
1773 
1774 	if (unveil(NULL, NULL) == -1)
1775 		fatal("unveil");
1776 }
1777 
1778 static void
1779 apply_unveil_selfexec(void)
1780 {
1781 	if (unveil(gotd.argv0, "x") == -1)
1782 		fatal("unveil %s", gotd.argv0);
1783 
1784 	if (unveil(NULL, NULL) == -1)
1785 		fatal("unveil");
1786 }
1787 
1788 int
1789 main(int argc, char **argv)
1790 {
1791 	const struct got_error *error = NULL;
1792 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1793 	const char *confpath = GOTD_CONF_PATH;
1794 	char *argv0 = argv[0];
1795 	char title[2048];
1796 	struct passwd *pw = NULL;
1797 	char *repo_path = NULL;
1798 	enum gotd_procid proc_id = PROC_GOTD;
1799 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1800 	int *pack_fds = NULL, *temp_fds = NULL;
1801 	struct gotd_repo *repo = NULL;
1802 
1803 	TAILQ_INIT(&procs);
1804 
1805 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1806 
1807 	while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1808 		switch (ch) {
1809 		case 'A':
1810 			proc_id = PROC_AUTH;
1811 			break;
1812 		case 'd':
1813 			daemonize = 0;
1814 			break;
1815 		case 'f':
1816 			confpath = optarg;
1817 			break;
1818 		case 'L':
1819 			proc_id = PROC_LISTEN;
1820 			break;
1821 		case 'n':
1822 			noaction = 1;
1823 			break;
1824 		case 'P':
1825 			repo_path = realpath(optarg, NULL);
1826 			if (repo_path == NULL)
1827 				fatal("realpath '%s'", optarg);
1828 			break;
1829 		case 'R':
1830 			proc_id = PROC_REPO_READ;
1831 			break;
1832 		case 's':
1833 			proc_id = PROC_SESSION_READ;
1834 			break;
1835 		case 'S':
1836 			proc_id = PROC_SESSION_WRITE;
1837 			break;
1838 		case 'v':
1839 			if (verbosity < 3)
1840 				verbosity++;
1841 			break;
1842 		case 'W':
1843 			proc_id = PROC_REPO_WRITE;
1844 			break;
1845 		default:
1846 			usage();
1847 		}
1848 	}
1849 
1850 	argc -= optind;
1851 	argv += optind;
1852 
1853 	if (argc != 0)
1854 		usage();
1855 
1856 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1857 		fatalx("need root privileges");
1858 
1859 	if (parse_config(confpath, proc_id, &gotd) != 0)
1860 		return 1;
1861 
1862 	pw = getpwnam(gotd.user_name);
1863 	if (pw == NULL)
1864 		fatalx("user %s not found", gotd.user_name);
1865 
1866 	if (pw->pw_uid == 0)
1867 		fatalx("cannot run %s as the superuser", getprogname());
1868 
1869 	if (noaction) {
1870 		fprintf(stderr, "configuration OK\n");
1871 		return 0;
1872 	}
1873 
1874 	gotd.argv0 = argv0;
1875 	gotd.daemonize = daemonize;
1876 	gotd.verbosity = verbosity;
1877 	gotd.confpath = confpath;
1878 
1879 	/* Require an absolute path in argv[0] for reliable re-exec. */
1880 	if (!got_path_is_absolute(argv0))
1881 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1882 
1883 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1884 	log_setverbose(verbosity);
1885 
1886 	if (proc_id == PROC_GOTD) {
1887 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1888 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1889 		if (daemonize && daemon(1, 0) == -1)
1890 			fatal("daemon");
1891 		gotd.pid = getpid();
1892 		start_listener(argv0, confpath, daemonize, verbosity);
1893 	} else if (proc_id == PROC_LISTEN) {
1894 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1895 		if (verbosity) {
1896 			log_info("socket: %s", gotd.unix_socket_path);
1897 			log_info("user: %s", pw->pw_name);
1898 		}
1899 
1900 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1901 		    pw->pw_gid);
1902 		if (fd == -1) {
1903 			fatal("cannot listen on unix socket %s",
1904 			    gotd.unix_socket_path);
1905 		}
1906 	} else if (proc_id == PROC_AUTH) {
1907 		snprintf(title, sizeof(title), "%s %s",
1908 		    gotd_proc_names[proc_id], repo_path);
1909 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1910 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1911 		error = got_repo_pack_fds_open(&pack_fds);
1912 		if (error != NULL)
1913 			fatalx("cannot open pack tempfiles: %s", error->msg);
1914 		error = got_repo_temp_fds_open(&temp_fds);
1915 		if (error != NULL)
1916 			fatalx("cannot open pack tempfiles: %s", error->msg);
1917 		if (repo_path == NULL)
1918 			fatalx("repository path not specified");
1919 		snprintf(title, sizeof(title), "%s %s",
1920 		    gotd_proc_names[proc_id], repo_path);
1921 	} else
1922 		fatal("invalid process id %d", proc_id);
1923 
1924 	setproctitle("%s", title);
1925 	log_procinit(title);
1926 
1927 	/* Drop root privileges. */
1928 	if (setgid(pw->pw_gid) == -1)
1929 		fatal("setgid %d failed", pw->pw_gid);
1930 	if (setuid(pw->pw_uid) == -1)
1931 		fatal("setuid %d failed", pw->pw_uid);
1932 
1933 	event_init();
1934 
1935 	switch (proc_id) {
1936 	case PROC_GOTD:
1937 #ifndef PROFILE
1938 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1939 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1940 			err(1, "pledge");
1941 #endif
1942 		break;
1943 	case PROC_LISTEN:
1944 #ifndef PROFILE
1945 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1946 			err(1, "pledge");
1947 #endif
1948 		/*
1949 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1950 		 * sockets by revoking all filesystem access via unveil(2).
1951 		 */
1952 		apply_unveil_none();
1953 
1954 		listen_main(title, fd, gotd.connection_limits,
1955 		    gotd.nconnection_limits);
1956 		/* NOTREACHED */
1957 		break;
1958 	case PROC_AUTH:
1959 #ifndef PROFILE
1960 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1961 			err(1, "pledge");
1962 #endif
1963 		/*
1964 		 * We need the "unix" pledge promise for getpeername(2) only.
1965 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
1966 		 * filesystem access via unveil(2). Access to password database
1967 		 * files will still work since "getpw" bypasses unveil(2).
1968 		 */
1969 		apply_unveil_none();
1970 
1971 		auth_main(title, &gotd.repos, repo_path);
1972 		/* NOTREACHED */
1973 		break;
1974 	case PROC_SESSION_READ:
1975 	case PROC_SESSION_WRITE:
1976 #ifndef PROFILE
1977 		/*
1978 		 * The "recvfd" promise is only needed during setup and
1979 		 * will be removed in a later pledge(2) call.
1980 		 */
1981 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
1982 		    "unveil", NULL) == -1)
1983 			err(1, "pledge");
1984 #endif
1985 		if (proc_id == PROC_SESSION_READ)
1986 			apply_unveil_repo_readonly(repo_path, 1);
1987 		else
1988 			apply_unveil_repo_readwrite(repo_path);
1989 		session_main(title, repo_path, pack_fds, temp_fds,
1990 		    &gotd.request_timeout, proc_id);
1991 		/* NOTREACHED */
1992 		break;
1993 	case PROC_REPO_READ:
1994 #ifndef PROFILE
1995 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1996 			err(1, "pledge");
1997 #endif
1998 		apply_unveil_repo_readonly(repo_path, 0);
1999 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2000 		/* NOTREACHED */
2001 		exit(0);
2002 	case PROC_REPO_WRITE:
2003 #ifndef PROFILE
2004 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2005 			err(1, "pledge");
2006 #endif
2007 		apply_unveil_repo_readonly(repo_path, 0);
2008 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2009 		if (repo == NULL)
2010 			fatalx("no repository for path %s", repo_path);
2011 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2012 		    &repo->protected_tag_namespaces,
2013 		    &repo->protected_branch_namespaces,
2014 		    &repo->protected_branches);
2015 		/* NOTREACHED */
2016 		exit(0);
2017 	default:
2018 		fatal("invalid process id %d", proc_id);
2019 	}
2020 
2021 	if (proc_id != PROC_GOTD)
2022 		fatal("invalid process id %d", proc_id);
2023 
2024 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2025 	    gotd.listen_proc);
2026 
2027 	apply_unveil_selfexec();
2028 
2029 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2030 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2031 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2032 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2033 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2034 	signal(SIGPIPE, SIG_IGN);
2035 
2036 	signal_add(&evsigint, NULL);
2037 	signal_add(&evsigterm, NULL);
2038 	signal_add(&evsighup, NULL);
2039 	signal_add(&evsigusr1, NULL);
2040 	signal_add(&evsigchld, NULL);
2041 
2042 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2043 
2044 	event_dispatch();
2045 
2046 	free(repo_path);
2047 	gotd_shutdown();
2048 
2049 	return 0;
2050 }