Game of Trees Repos

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Date:: Fri Jul 14 12:59:53 2023 UTC
Message:: fix typo in a comment
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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/tree.h>
19 #include <sys/time.h>
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <sys/socket.h>
23 #include <sys/un.h>
24 #include <sys/wait.h>
25 
26 #include <fcntl.h>
27 #include <err.h>
28 #include <errno.h>
29 #include <event.h>
30 #include <limits.h>
31 #include <pwd.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <sha2.h>
35 #include <signal.h>
36 #include <siphash.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <syslog.h>
42 #include <unistd.h>
43 
44 #include "got_error.h"
45 #include "got_opentemp.h"
46 #include "got_path.h"
47 #include "got_repository.h"
48 #include "got_object.h"
49 #include "got_reference.h"
50 
51 #include "got_lib_delta.h"
52 #include "got_lib_object.h"
53 #include "got_lib_object_cache.h"
54 #include "got_lib_hash.h"
55 #include "got_lib_gitproto.h"
56 #include "got_lib_pack.h"
57 #include "got_lib_repository.h"
58 
59 #include "gotd.h"
60 #include "log.h"
61 #include "listen.h"
62 #include "auth.h"
63 #include "session.h"
64 #include "repo_read.h"
65 #include "repo_write.h"
66 
67 #ifndef nitems
68 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
69 #endif
70 
71 enum gotd_client_state {
72 	GOTD_CLIENT_STATE_NEW,
73 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
74 };
75 
76 struct gotd_child_proc {
77 	pid_t				 pid;
78 	enum gotd_procid		 type;
79 	char				 repo_name[NAME_MAX];
80 	char				 repo_path[PATH_MAX];
81 	int				 pipe[2];
82 	struct gotd_imsgev		 iev;
83 	struct event			 tmo;
84 
85 	TAILQ_ENTRY(gotd_child_proc)	 entry;
86 };
87 TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
88 
89 struct gotd_client {
90 	STAILQ_ENTRY(gotd_client)	 entry;
91 	enum gotd_client_state		 state;
92 	uint32_t			 id;
93 	int				 fd;
94 	struct gotd_imsgev		 iev;
95 	struct event			 tmo;
96 	uid_t				 euid;
97 	gid_t				 egid;
98 	struct gotd_child_proc		*repo;
99 	struct gotd_child_proc		*auth;
100 	struct gotd_child_proc		*session;
101 	int				 required_auth;
102 };
103 STAILQ_HEAD(gotd_clients, gotd_client);
104 
105 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
106 static SIPHASH_KEY clients_hash_key;
107 volatile int client_cnt;
108 static struct timeval auth_timeout = { 5, 0 };
109 static struct gotd gotd;
110 
111 void gotd_sighdlr(int sig, short event, void *arg);
112 static void gotd_shutdown(void);
113 static const struct got_error *start_session_child(struct gotd_client *,
114     struct gotd_repo *, char *, const char *, int, int);
115 static const struct got_error *start_repo_child(struct gotd_client *,
116     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
117 static const struct got_error *start_auth_child(struct gotd_client *, int,
118     struct gotd_repo *, char *, const char *, int, int);
119 static void kill_proc(struct gotd_child_proc *, int);
120 static void disconnect(struct gotd_client *);
121 
122 __dead static void
123 usage(void)
124 {
125 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
126 	exit(1);
127 }
128 
129 static int
130 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
131 {
132 	struct sockaddr_un sun;
133 	int fd = -1;
134 	mode_t old_umask, mode;
135 
136 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
137 	if (fd == -1) {
138 		log_warn("socket");
139 		return -1;
140 	}
141 
142 	sun.sun_family = AF_UNIX;
143 	if (strlcpy(sun.sun_path, unix_socket_path,
144 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
145 		log_warnx("%s: name too long", unix_socket_path);
146 		close(fd);
147 		return -1;
148 	}
149 
150 	if (unlink(unix_socket_path) == -1) {
151 		if (errno != ENOENT) {
152 			log_warn("unlink %s", unix_socket_path);
153 			close(fd);
154 			return -1;
155 		}
156 	}
157 
158 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
159 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
160 
161 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
162 		log_warn("bind: %s", unix_socket_path);
163 		close(fd);
164 		umask(old_umask);
165 		return -1;
166 	}
167 
168 	umask(old_umask);
169 
170 	if (chmod(unix_socket_path, mode) == -1) {
171 		log_warn("chmod %o %s", mode, unix_socket_path);
172 		close(fd);
173 		unlink(unix_socket_path);
174 		return -1;
175 	}
176 
177 	if (chown(unix_socket_path, uid, gid) == -1) {
178 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
179 		close(fd);
180 		unlink(unix_socket_path);
181 		return -1;
182 	}
183 
184 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
185 		log_warn("listen");
186 		close(fd);
187 		unlink(unix_socket_path);
188 		return -1;
189 	}
190 
191 	return fd;
192 }
193 
194 static uint64_t
195 client_hash(uint32_t client_id)
196 {
197 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
198 }
199 
200 static void
201 add_client(struct gotd_client *client)
202 {
203 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
204 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
205 	client_cnt++;
206 }
207 
208 static struct gotd_client *
209 find_client(uint32_t client_id)
210 {
211 	uint64_t slot;
212 	struct gotd_client *c;
213 
214 	slot = client_hash(client_id) % nitems(gotd_clients);
215 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
216 		if (c->id == client_id)
217 			return c;
218 	}
219 
220 	return NULL;
221 }
222 
223 static struct gotd_client *
224 find_client_by_proc_fd(int fd)
225 {
226 	uint64_t slot;
227 
228 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
229 		struct gotd_client *c;
230 
231 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
232 			if (c->repo && c->repo->iev.ibuf.fd == fd)
233 				return c;
234 			if (c->auth && c->auth->iev.ibuf.fd == fd)
235 				return c;
236 			if (c->session && c->session->iev.ibuf.fd == fd)
237 				return c;
238 		}
239 	}
240 
241 	return NULL;
242 }
243 
244 static int
245 client_is_reading(struct gotd_client *client)
246 {
247 	return (client->required_auth &
248 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
249 }
250 
251 static int
252 client_is_writing(struct gotd_client *client)
253 {
254 	return (client->required_auth &
255 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
256 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
257 }
258 
259 static const struct got_error *
260 ensure_client_is_not_writing(struct gotd_client *client)
261 {
262 	if (client_is_writing(client)) {
263 		return got_error_fmt(GOT_ERR_BAD_PACKET,
264 		    "uid %d made a read-request but is writing to "
265 		    "a repository", client->euid);
266 	}
267 
268 	return NULL;
269 }
270 
271 static const struct got_error *
272 ensure_client_is_not_reading(struct gotd_client *client)
273 {
274 	if (client_is_reading(client)) {
275 		return got_error_fmt(GOT_ERR_BAD_PACKET,
276 		    "uid %d made a write-request but is reading from "
277 		    "a repository", client->euid);
278 	}
279 
280 	return NULL;
281 }
282 
283 static void
284 proc_done(struct gotd_child_proc *proc)
285 {
286 	struct gotd_client *client;
287 
288 	TAILQ_REMOVE(&procs, proc, entry);
289 
290 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
291 	if (client != NULL) {
292 		if (proc == client->repo)
293 			client->repo = NULL;
294 		if (proc == client->auth)
295 			client->auth = NULL;
296 		if (proc == client->session)
297 			client->session = NULL;
298 		disconnect(client);
299 	}
300 
301 	evtimer_del(&proc->tmo);
302 
303 	if (proc->iev.ibuf.fd != -1) {
304 		event_del(&proc->iev.ev);
305 		msgbuf_clear(&proc->iev.ibuf.w);
306 		close(proc->iev.ibuf.fd);
307 	}
308 
309 	free(proc);
310 }
311 
312 static void
313 kill_repo_proc(struct gotd_client *client)
314 {
315 	if (client->repo == NULL)
316 		return;
317 
318 	kill_proc(client->repo, 0);
319 	client->repo = NULL;
320 }
321 
322 static void
323 kill_auth_proc(struct gotd_client *client)
324 {
325 	if (client->auth == NULL)
326 		return;
327 
328 	kill_proc(client->auth, 0);
329 	client->auth = NULL;
330 }
331 
332 static void
333 kill_session_proc(struct gotd_client *client)
334 {
335 	if (client->session == NULL)
336 		return;
337 
338 	kill_proc(client->session, 0);
339 	client->session = NULL;
340 }
341 
342 static void
343 disconnect(struct gotd_client *client)
344 {
345 	struct gotd_imsg_disconnect idisconnect;
346 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
347 	uint64_t slot;
348 
349 	log_debug("uid %d: disconnecting", client->euid);
350 
351 	kill_auth_proc(client);
352 	kill_session_proc(client);
353 	kill_repo_proc(client);
354 
355 	idisconnect.client_id = client->id;
356 	if (gotd_imsg_compose_event(&listen_proc->iev,
357 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
358 	    &idisconnect, sizeof(idisconnect)) == -1)
359 		log_warn("imsg compose DISCONNECT");
360 
361 	slot = client_hash(client->id) % nitems(gotd_clients);
362 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
363 	imsg_clear(&client->iev.ibuf);
364 	event_del(&client->iev.ev);
365 	evtimer_del(&client->tmo);
366 	if (client->fd != -1)
367 		close(client->fd);
368 	else if (client->iev.ibuf.fd != -1)
369 		close(client->iev.ibuf.fd);
370 	free(client);
371 	client_cnt--;
372 }
373 
374 static void
375 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
376 {
377 	struct imsgbuf ibuf;
378 
379 	log_warnx("uid %d: %s", client->euid, err->msg);
380 	if (err->code != GOT_ERR_EOF && client->fd != -1) {
381 		imsg_init(&ibuf, client->fd);
382 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
383 		imsg_clear(&ibuf);
384 	}
385 	disconnect(client);
386 }
387 
388 static const struct got_error *
389 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
390 {
391 	const struct got_error *err = NULL;
392 	struct gotd_imsg_info_repo irepo;
393 
394 	memset(&irepo, 0, sizeof(irepo));
395 
396 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
397 	    >= sizeof(irepo.repo_name))
398 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
399 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
400 	    >= sizeof(irepo.repo_path))
401 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
402 
403 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
404 	    &irepo, sizeof(irepo)) == -1) {
405 		err = got_error_from_errno("imsg compose INFO_REPO");
406 		if (err)
407 			return err;
408 	}
409 
410 	return NULL;
411 }
412 
413 static const struct got_error *
414 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
415 {
416 	const struct got_error *err = NULL;
417 	struct gotd_imsg_info_client iclient;
418 	struct gotd_child_proc *proc;
419 
420 	memset(&iclient, 0, sizeof(iclient));
421 	iclient.euid = client->euid;
422 	iclient.egid = client->egid;
423 
424 	proc = client->repo;
425 	if (proc) {
426 		if (strlcpy(iclient.repo_name, proc->repo_path,
427 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
428 			return got_error_msg(GOT_ERR_NO_SPACE,
429 			    "repo name too long");
430 		}
431 		if (client_is_writing(client))
432 			iclient.is_writing = 1;
433 
434 		iclient.repo_child_pid = proc->pid;
435 	}
436 
437 	if (client->session)
438 		iclient.session_child_pid = client->session->pid;
439 
440 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
441 	    &iclient, sizeof(iclient)) == -1) {
442 		err = got_error_from_errno("imsg compose INFO_CLIENT");
443 		if (err)
444 			return err;
445 	}
446 
447 	return NULL;
448 }
449 
450 static const struct got_error *
451 send_info(struct gotd_client *client)
452 {
453 	const struct got_error *err = NULL;
454 	struct gotd_imsg_info info;
455 	uint64_t slot;
456 	struct gotd_repo *repo;
457 
458 	if (client->euid != 0)
459 		return got_error_set_errno(EPERM, "info");
460 
461 	info.pid = gotd.pid;
462 	info.verbosity = gotd.verbosity;
463 	info.nrepos = gotd.nrepos;
464 	info.nclients = client_cnt - 1;
465 
466 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
467 	    &info, sizeof(info)) == -1) {
468 		err = got_error_from_errno("imsg compose INFO");
469 		if (err)
470 			return err;
471 	}
472 
473 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
474 		err = send_repo_info(&client->iev, repo);
475 		if (err)
476 			return err;
477 	}
478 
479 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
480 		struct gotd_client *c;
481 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
482 			if (c->id == client->id)
483 				continue;
484 			err = send_client_info(&client->iev, c);
485 			if (err)
486 				return err;
487 		}
488 	}
489 
490 	return NULL;
491 }
492 
493 static const struct got_error *
494 stop_gotd(struct gotd_client *client)
495 {
496 
497 	if (client->euid != 0)
498 		return got_error_set_errno(EPERM, "stop");
499 
500 	gotd_shutdown();
501 	/* NOTREACHED */
502 	return NULL;
503 }
504 
505 static const struct got_error *
506 start_client_authentication(struct gotd_client *client, struct imsg *imsg)
507 {
508 	const struct got_error *err;
509 	struct gotd_imsg_list_refs ireq;
510 	struct gotd_repo *repo = NULL;
511 	size_t datalen;
512 
513 	log_debug("list-refs request from uid %d", client->euid);
514 
515 	if (client->state != GOTD_CLIENT_STATE_NEW)
516 		return got_error_msg(GOT_ERR_BAD_REQUEST,
517 		    "unexpected list-refs request received");
518 
519 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
520 	if (datalen != sizeof(ireq))
521 		return got_error(GOT_ERR_PRIVSEP_LEN);
522 
523 	memcpy(&ireq, imsg->data, datalen);
524 
525 	if (ireq.client_is_reading) {
526 		err = ensure_client_is_not_writing(client);
527 		if (err)
528 			return err;
529 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
530 		if (repo == NULL)
531 			return got_error(GOT_ERR_NOT_GIT_REPO);
532 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
533 		    gotd.argv0, gotd.confpath, gotd.daemonize,
534 		    gotd.verbosity);
535 		if (err)
536 			return err;
537 	} else {
538 		err = ensure_client_is_not_reading(client);
539 		if (err)
540 			return err;
541 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
542 		if (repo == NULL)
543 			return got_error(GOT_ERR_NOT_GIT_REPO);
544 		err = start_auth_child(client,
545 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
546 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
547 		    gotd.verbosity);
548 		if (err)
549 			return err;
550 	}
551 
552 	evtimer_add(&client->tmo, &auth_timeout);
553 
554 	/* Flow continues upon authentication success/failure or timeout. */
555 	return NULL;
556 }
557 
558 static void
559 gotd_request(int fd, short events, void *arg)
560 {
561 	struct gotd_imsgev *iev = arg;
562 	struct imsgbuf *ibuf = &iev->ibuf;
563 	struct gotd_client *client = iev->handler_arg;
564 	const struct got_error *err = NULL;
565 	struct imsg imsg;
566 	ssize_t n;
567 
568 	if (events & EV_WRITE) {
569 		while (ibuf->w.queued) {
570 			n = msgbuf_write(&ibuf->w);
571 			if (n == -1 && errno == EPIPE) {
572 				/*
573 				 * The client has closed its socket.
574 				 * This can happen when Git clients are
575 				 * done sending pack file data.
576 				 */
577 				msgbuf_clear(&ibuf->w);
578 				continue;
579 			} else if (n == -1 && errno != EAGAIN) {
580 				err = got_error_from_errno("imsg_flush");
581 				disconnect_on_error(client, err);
582 				return;
583 			}
584 			if (n == 0) {
585 				/* Connection closed. */
586 				err = got_error(GOT_ERR_EOF);
587 				disconnect_on_error(client, err);
588 				return;
589 			}
590 		}
591 
592 		/* Disconnect gotctl(8) now that messages have been sent. */
593 		if (!client_is_reading(client) && !client_is_writing(client)) {
594 			disconnect(client);
595 			return;
596 		}
597 	}
598 
599 	if ((events & EV_READ) == 0)
600 		return;
601 
602 	memset(&imsg, 0, sizeof(imsg));
603 
604 	while (err == NULL) {
605 		err = gotd_imsg_recv(&imsg, ibuf, 0);
606 		if (err) {
607 			if (err->code == GOT_ERR_PRIVSEP_READ)
608 				err = NULL;
609 			break;
610 		}
611 
612 		evtimer_del(&client->tmo);
613 
614 		switch (imsg.hdr.type) {
615 		case GOTD_IMSG_INFO:
616 			err = send_info(client);
617 			break;
618 		case GOTD_IMSG_STOP:
619 			err = stop_gotd(client);
620 			break;
621 		case GOTD_IMSG_LIST_REFS:
622 			err = start_client_authentication(client, &imsg);
623 			break;
624 		default:
625 			log_debug("unexpected imsg %d", imsg.hdr.type);
626 			err = got_error(GOT_ERR_PRIVSEP_MSG);
627 			break;
628 		}
629 
630 		imsg_free(&imsg);
631 	}
632 
633 	if (err) {
634 		disconnect_on_error(client, err);
635 	} else {
636 		gotd_imsg_event_add(&client->iev);
637 	}
638 }
639 
640 static void
641 gotd_auth_timeout(int fd, short events, void *arg)
642 {
643 	struct gotd_client *client = arg;
644 
645 	log_debug("disconnecting uid %d due to authentication timeout",
646 	    client->euid);
647 	disconnect(client);
648 }
649 
650 static const struct got_error *
651 recv_connect(uint32_t *client_id, struct imsg *imsg)
652 {
653 	const struct got_error *err = NULL;
654 	struct gotd_imsg_connect iconnect;
655 	size_t datalen;
656 	int s = -1;
657 	struct gotd_client *client = NULL;
658 
659 	*client_id = 0;
660 
661 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
662 	if (datalen != sizeof(iconnect))
663 		return got_error(GOT_ERR_PRIVSEP_LEN);
664 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
665 
666 	s = imsg->fd;
667 	if (s == -1) {
668 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
669 		goto done;
670 	}
671 
672 	if (find_client(iconnect.client_id)) {
673 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
674 		goto done;
675 	}
676 
677 	client = calloc(1, sizeof(*client));
678 	if (client == NULL) {
679 		err = got_error_from_errno("calloc");
680 		goto done;
681 	}
682 
683 	*client_id = iconnect.client_id;
684 
685 	client->state = GOTD_CLIENT_STATE_NEW;
686 	client->id = iconnect.client_id;
687 	client->fd = s;
688 	s = -1;
689 	/* The auth process will verify UID/GID for us. */
690 	client->euid = iconnect.euid;
691 	client->egid = iconnect.egid;
692 
693 	imsg_init(&client->iev.ibuf, client->fd);
694 	client->iev.handler = gotd_request;
695 	client->iev.events = EV_READ;
696 	client->iev.handler_arg = client;
697 
698 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
699 	    &client->iev);
700 	gotd_imsg_event_add(&client->iev);
701 
702 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
703 
704 	add_client(client);
705 	log_debug("%s: new client uid %d connected on fd %d", __func__,
706 	    client->euid, client->fd);
707 done:
708 	if (err) {
709 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
710 		struct gotd_imsg_disconnect idisconnect;
711 
712 		idisconnect.client_id = client->id;
713 		if (gotd_imsg_compose_event(&listen_proc->iev,
714 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
715 		    &idisconnect, sizeof(idisconnect)) == -1)
716 			log_warn("imsg compose DISCONNECT");
717 
718 		if (s != -1)
719 			close(s);
720 	}
721 
722 	return err;
723 }
724 
725 static const char *gotd_proc_names[PROC_MAX] = {
726 	"parent",
727 	"listen",
728 	"auth",
729 	"session_read",
730 	"session_write",
731 	"repo_read",
732 	"repo_write",
733 	"gitwrapper"
734 };
735 
736 static void
737 kill_proc(struct gotd_child_proc *proc, int fatal)
738 {
739 	struct timeval tv = { 5, 0 };
740 
741 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
742 
743 	if (proc->iev.ibuf.fd != -1) {
744 		event_del(&proc->iev.ev);
745 		msgbuf_clear(&proc->iev.ibuf.w);
746 		close(proc->iev.ibuf.fd);
747 		proc->iev.ibuf.fd = -1;
748 	}
749 
750 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
751 		evtimer_add(&proc->tmo, &tv);
752 
753 	if (fatal) {
754 		log_warnx("sending SIGKILL to PID %d", proc->pid);
755 		kill(proc->pid, SIGKILL);
756 	} else
757 		kill(proc->pid, SIGTERM);
758 }
759 
760 static void
761 kill_proc_timeout(int fd, short ev, void *d)
762 {
763 	struct gotd_child_proc *proc = d;
764 
765 	log_warnx("timeout waiting for PID %d to terminate;"
766 	    " retrying with force", proc->pid);
767 	kill_proc(proc, 1);
768 }
769 
770 static void
771 gotd_shutdown(void)
772 {
773 	uint64_t slot;
774 
775 	log_debug("shutting down");
776 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
777 		struct gotd_client *c, *tmp;
778 
779 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
780 			disconnect(c);
781 	}
782 
783 	kill_proc(gotd.listen_proc, 0);
784 
785 	log_info("terminating");
786 	exit(0);
787 }
788 
789 static struct gotd_child_proc *
790 find_proc_by_pid(pid_t pid)
791 {
792 	struct gotd_child_proc *proc = NULL;
793 
794 	TAILQ_FOREACH(proc, &procs, entry)
795 		if (proc->pid == pid)
796 			break;
797 
798 	return proc;
799 }
800 
801 void
802 gotd_sighdlr(int sig, short event, void *arg)
803 {
804 	struct gotd_child_proc *proc;
805 	pid_t pid;
806 	int status;
807 
808 	/*
809 	 * Normal signal handler rules don't apply because libevent
810 	 * decouples for us.
811 	 */
812 
813 	switch (sig) {
814 	case SIGHUP:
815 		log_info("%s: ignoring SIGHUP", __func__);
816 		break;
817 	case SIGUSR1:
818 		log_info("%s: ignoring SIGUSR1", __func__);
819 		break;
820 	case SIGTERM:
821 	case SIGINT:
822 		gotd_shutdown();
823 		break;
824 	case SIGCHLD:
825 		for (;;) {
826 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
827 			if (pid == -1) {
828 				if (errno == EINTR)
829 					continue;
830 				if (errno == ECHILD)
831 					break;
832 				fatal("waitpid");
833 			}
834 			if (pid == 0)
835 				break;
836 
837 			log_debug("reaped pid %d", pid);
838 			proc = find_proc_by_pid(pid);
839 			if (proc == NULL) {
840 				log_info("caught exit of unknown child %d",
841 				    pid);
842 				continue;
843 			}
844 
845 			if (WIFSIGNALED(status)) {
846 				log_warnx("child PID %d terminated with"
847 				    " signal %d", pid, WTERMSIG(status));
848 			}
849 
850 			proc_done(proc);
851 		}
852 		break;
853 	default:
854 		fatalx("unexpected signal");
855 	}
856 }
857 
858 static const struct got_error *
859 ensure_proc_is_reading(struct gotd_client *client,
860     struct gotd_child_proc *proc)
861 {
862 	if (!client_is_reading(client)) {
863 		kill_proc(proc, 1);
864 		return got_error_fmt(GOT_ERR_BAD_PACKET,
865 		    "PID %d handled a read-request for uid %d but this "
866 		    "user is not reading from a repository", proc->pid,
867 		    client->euid);
868 	}
869 
870 	return NULL;
871 }
872 
873 static const struct got_error *
874 ensure_proc_is_writing(struct gotd_client *client,
875     struct gotd_child_proc *proc)
876 {
877 	if (!client_is_writing(client)) {
878 		kill_proc(proc, 1);
879 		return got_error_fmt(GOT_ERR_BAD_PACKET,
880 		    "PID %d handled a write-request for uid %d but this "
881 		    "user is not writing to a repository", proc->pid,
882 		    client->euid);
883 	}
884 
885 	return NULL;
886 }
887 
888 static int
889 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
890     struct imsg *imsg)
891 {
892 	const struct got_error *err;
893 	int ret = 0;
894 
895 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
896 		if (client->repo == NULL)
897 			fatalx("no process found for uid %d", client->euid);
898 		if (proc->pid != client->repo->pid) {
899 			kill_proc(proc, 1);
900 			log_warnx("received message from PID %d for uid %d, "
901 			    "while PID %d is the process serving this user",
902 			    proc->pid, client->euid, client->repo->pid);
903 			return 0;
904 		}
905 	}
906 	if (proc->type == PROC_SESSION_READ ||
907 	    proc->type == PROC_SESSION_WRITE) {
908 		if (client->session == NULL) {
909 			log_warnx("no session found for uid %d", client->euid);
910 			return 0;
911 		}
912 		if (proc->pid != client->session->pid) {
913 			kill_proc(proc, 1);
914 			log_warnx("received message from PID %d for uid %d, "
915 			    "while PID %d is the process serving this user",
916 			    proc->pid, client->euid, client->session->pid);
917 			return 0;
918 		}
919 	}
920 
921 	switch (imsg->hdr.type) {
922 	case GOTD_IMSG_ERROR:
923 		ret = 1;
924 		break;
925 	case GOTD_IMSG_CONNECT:
926 		if (proc->type != PROC_LISTEN) {
927 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
928 			    "new connection for uid %d from PID %d "
929 			    "which is not the listen process",
930 			    proc->pid, client->euid);
931 		} else
932 			ret = 1;
933 		break;
934 	case GOTD_IMSG_ACCESS_GRANTED:
935 		if (proc->type != PROC_AUTH) {
936 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
937 			    "authentication of uid %d from PID %d "
938 			    "which is not the auth process",
939 			    proc->pid, client->euid);
940 		} else
941 			ret = 1;
942 		break;
943 	case GOTD_IMSG_CLIENT_SESSION_READY:
944 		if (proc->type != PROC_SESSION_READ &&
945 		    proc->type != PROC_SESSION_WRITE) {
946 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
947 			    "unexpected \"ready\" signal from PID %d",
948 			    proc->pid);
949 		} else
950 			ret = 1;
951 		break;
952 	case GOTD_IMSG_REPO_CHILD_READY:
953 		if (proc->type != PROC_REPO_READ &&
954 		    proc->type != PROC_REPO_WRITE) {
955 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
956 			    "unexpected \"ready\" signal from PID %d",
957 			    proc->pid);
958 		} else
959 			ret = 1;
960 		break;
961 	case GOTD_IMSG_PACKFILE_DONE:
962 		err = ensure_proc_is_reading(client, proc);
963 		if (err)
964 			log_warnx("uid %d: %s", client->euid, err->msg);
965 		else
966 			ret = 1;
967 		break;
968 	case GOTD_IMSG_PACKFILE_INSTALL:
969 	case GOTD_IMSG_REF_UPDATES_START:
970 	case GOTD_IMSG_REF_UPDATE:
971 		err = ensure_proc_is_writing(client, proc);
972 		if (err)
973 			log_warnx("uid %d: %s", client->euid, err->msg);
974 		else
975 			ret = 1;
976 		break;
977 	default:
978 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
979 		break;
980 	}
981 
982 	return ret;
983 }
984 
985 static const struct got_error *
986 connect_repo_child(struct gotd_client *client,
987     struct gotd_child_proc *repo_proc)
988 {
989 	static const struct got_error *err;
990 	struct gotd_imsgev *session_iev = &client->session->iev;
991 	struct gotd_imsg_connect_repo_child ireq;
992 	int pipe[2];
993 
994 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
995 		return got_error_msg(GOT_ERR_BAD_REQUEST,
996 		    "unexpected repo child ready signal received");
997 
998 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
999 	    PF_UNSPEC, pipe) == -1)
1000 		fatal("socketpair");
1001 
1002 	memset(&ireq, 0, sizeof(ireq));
1003 	ireq.client_id = client->id;
1004 	ireq.proc_id = repo_proc->type;
1005 
1006 	/* Pass repo child pipe to session child process. */
1007 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1008 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1009 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1010 		close(pipe[0]);
1011 		close(pipe[1]);
1012 		return err;
1013 	}
1014 
1015 	/* Pass session child pipe to repo child process. */
1016 	if (gotd_imsg_compose_event(&repo_proc->iev,
1017 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1018 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1019 		close(pipe[1]);
1020 		return err;
1021 	}
1022 
1023 	return NULL;
1024 }
1025 
1026 static void
1027 gotd_dispatch_listener(int fd, short event, void *arg)
1028 {
1029 	struct gotd_imsgev *iev = arg;
1030 	struct imsgbuf *ibuf = &iev->ibuf;
1031 	struct gotd_child_proc *proc = gotd.listen_proc;
1032 	ssize_t n;
1033 	int shut = 0;
1034 	struct imsg imsg;
1035 
1036 	if (proc->iev.ibuf.fd != fd)
1037 		fatalx("%s: unexpected fd %d", __func__, fd);
1038 
1039 	if (event & EV_READ) {
1040 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1041 			fatal("imsg_read error");
1042 		if (n == 0) {
1043 			/* Connection closed. */
1044 			shut = 1;
1045 			goto done;
1046 		}
1047 	}
1048 
1049 	if (event & EV_WRITE) {
1050 		n = msgbuf_write(&ibuf->w);
1051 		if (n == -1 && errno != EAGAIN)
1052 			fatal("msgbuf_write");
1053 		if (n == 0) {
1054 			/* Connection closed. */
1055 			shut = 1;
1056 			goto done;
1057 		}
1058 	}
1059 
1060 	for (;;) {
1061 		const struct got_error *err = NULL;
1062 		struct gotd_client *client = NULL;
1063 		uint32_t client_id = 0;
1064 		int do_disconnect = 0;
1065 
1066 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1067 			fatal("%s: imsg_get error", __func__);
1068 		if (n == 0)	/* No more messages. */
1069 			break;
1070 
1071 		switch (imsg.hdr.type) {
1072 		case GOTD_IMSG_ERROR:
1073 			do_disconnect = 1;
1074 			err = gotd_imsg_recv_error(&client_id, &imsg);
1075 			break;
1076 		case GOTD_IMSG_CONNECT:
1077 			err = recv_connect(&client_id, &imsg);
1078 			break;
1079 		default:
1080 			log_debug("unexpected imsg %d", imsg.hdr.type);
1081 			break;
1082 		}
1083 
1084 		client = find_client(client_id);
1085 		if (client == NULL) {
1086 			log_warnx("%s: client not found", __func__);
1087 			imsg_free(&imsg);
1088 			continue;
1089 		}
1090 
1091 		if (err)
1092 			log_warnx("uid %d: %s", client->euid, err->msg);
1093 
1094 		if (do_disconnect) {
1095 			if (err)
1096 				disconnect_on_error(client, err);
1097 			else
1098 				disconnect(client);
1099 		}
1100 
1101 		imsg_free(&imsg);
1102 	}
1103 done:
1104 	if (!shut) {
1105 		gotd_imsg_event_add(iev);
1106 	} else {
1107 		/* This pipe is dead. Remove its event handler */
1108 		event_del(&iev->ev);
1109 		event_loopexit(NULL);
1110 	}
1111 }
1112 
1113 static void
1114 gotd_dispatch_auth_child(int fd, short event, void *arg)
1115 {
1116 	const struct got_error *err = NULL;
1117 	struct gotd_imsgev *iev = arg;
1118 	struct imsgbuf *ibuf = &iev->ibuf;
1119 	struct gotd_client *client;
1120 	struct gotd_repo *repo = NULL;
1121 	ssize_t n;
1122 	int shut = 0;
1123 	struct imsg imsg;
1124 	uint32_t client_id = 0;
1125 	int do_disconnect = 0;
1126 
1127 	client = find_client_by_proc_fd(fd);
1128 	if (client == NULL) {
1129 		/* Can happen during process teardown. */
1130 		warnx("cannot find client for fd %d", fd);
1131 		shut = 1;
1132 		goto done;
1133 	}
1134 
1135 	if (client->auth == NULL)
1136 		fatalx("cannot find auth child process for fd %d", fd);
1137 
1138 	if (event & EV_READ) {
1139 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1140 			fatal("imsg_read error");
1141 		if (n == 0) {
1142 			/* Connection closed. */
1143 			shut = 1;
1144 			goto done;
1145 		}
1146 	}
1147 
1148 	if (event & EV_WRITE) {
1149 		n = msgbuf_write(&ibuf->w);
1150 		if (n == -1 && errno != EAGAIN)
1151 			fatal("msgbuf_write");
1152 		if (n == 0) {
1153 			/* Connection closed. */
1154 			shut = 1;
1155 		}
1156 		goto done;
1157 	}
1158 
1159 	if (client->auth->iev.ibuf.fd != fd)
1160 		fatalx("%s: unexpected fd %d", __func__, fd);
1161 
1162 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1163 		fatal("%s: imsg_get error", __func__);
1164 	if (n == 0)	/* No more messages. */
1165 		return;
1166 
1167 	evtimer_del(&client->tmo);
1168 
1169 	switch (imsg.hdr.type) {
1170 	case GOTD_IMSG_ERROR:
1171 		do_disconnect = 1;
1172 		err = gotd_imsg_recv_error(&client_id, &imsg);
1173 		break;
1174 	case GOTD_IMSG_ACCESS_GRANTED:
1175 		client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1176 		break;
1177 	default:
1178 		do_disconnect = 1;
1179 		log_debug("unexpected imsg %d", imsg.hdr.type);
1180 		break;
1181 	}
1182 
1183 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1184 		do_disconnect = 1;
1185 		log_debug("dropping imsg type %d from PID %d",
1186 		    imsg.hdr.type, client->auth->pid);
1187 	}
1188 	imsg_free(&imsg);
1189 
1190 	if (do_disconnect) {
1191 		if (err)
1192 			disconnect_on_error(client, err);
1193 		else
1194 			disconnect(client);
1195 		return;
1196 	}
1197 
1198 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1199 	if (repo == NULL) {
1200 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1201 		goto done;
1202 	}
1203 	kill_auth_proc(client);
1204 
1205 	log_info("authenticated uid %d for repository %s",
1206 	    client->euid, repo->name);
1207 
1208 	err = start_session_child(client, repo, gotd.argv0,
1209 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1210 	if (err)
1211 		goto done;
1212 done:
1213 	if (err)
1214 		log_warnx("uid %d: %s", client->euid, err->msg);
1215 
1216 	/* We might have killed the auth process by now. */
1217 	if (client->auth != NULL) {
1218 		if (!shut) {
1219 			gotd_imsg_event_add(iev);
1220 		} else {
1221 			/* This pipe is dead. Remove its event handler */
1222 			event_del(&iev->ev);
1223 		}
1224 	}
1225 }
1226 
1227 static const struct got_error *
1228 connect_session(struct gotd_client *client)
1229 {
1230 	const struct got_error *err = NULL;
1231 	struct gotd_imsg_connect iconnect;
1232 	int s;
1233 
1234 	memset(&iconnect, 0, sizeof(iconnect));
1235 
1236 	s = dup(client->fd);
1237 	if (s == -1)
1238 		return got_error_from_errno("dup");
1239 
1240 	iconnect.client_id = client->id;
1241 	iconnect.euid = client->euid;
1242 	iconnect.egid = client->egid;
1243 
1244 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1245 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1246 		err = got_error_from_errno("imsg compose CONNECT");
1247 		close(s);
1248 		return err;
1249 	}
1250 
1251 	/*
1252 	 * We are no longer interested in messages from this client.
1253 	 * Further client requests will be handled by the session process.
1254 	 */
1255 	msgbuf_clear(&client->iev.ibuf.w);
1256 	imsg_clear(&client->iev.ibuf);
1257 	event_del(&client->iev.ev);
1258 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1259 
1260 	return NULL;
1261 }
1262 
1263 static void
1264 gotd_dispatch_client_session(int fd, short event, void *arg)
1265 {
1266 	struct gotd_imsgev *iev = arg;
1267 	struct imsgbuf *ibuf = &iev->ibuf;
1268 	struct gotd_child_proc *proc = NULL;
1269 	struct gotd_client *client = NULL;
1270 	ssize_t n;
1271 	int shut = 0;
1272 	struct imsg imsg;
1273 
1274 	client = find_client_by_proc_fd(fd);
1275 	if (client == NULL) {
1276 		/* Can happen during process teardown. */
1277 		warnx("cannot find client for fd %d", fd);
1278 		shut = 1;
1279 		goto done;
1280 	}
1281 
1282 	if (event & EV_READ) {
1283 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1284 			fatal("imsg_read error");
1285 		if (n == 0) {
1286 			/* Connection closed. */
1287 			shut = 1;
1288 			goto done;
1289 		}
1290 	}
1291 
1292 	if (event & EV_WRITE) {
1293 		n = msgbuf_write(&ibuf->w);
1294 		if (n == -1 && errno != EAGAIN)
1295 			fatal("msgbuf_write");
1296 		if (n == 0) {
1297 			/* Connection closed. */
1298 			shut = 1;
1299 			goto done;
1300 		}
1301 	}
1302 
1303 	proc = client->session;
1304 	if (proc == NULL)
1305 		fatalx("cannot find session child process for fd %d", fd);
1306 
1307 	for (;;) {
1308 		const struct got_error *err = NULL;
1309 		uint32_t client_id = 0;
1310 		int do_disconnect = 0, do_start_repo_child = 0;
1311 
1312 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1313 			fatal("%s: imsg_get error", __func__);
1314 		if (n == 0)	/* No more messages. */
1315 			break;
1316 
1317 		switch (imsg.hdr.type) {
1318 		case GOTD_IMSG_ERROR:
1319 			do_disconnect = 1;
1320 			err = gotd_imsg_recv_error(&client_id, &imsg);
1321 			break;
1322 		case GOTD_IMSG_CLIENT_SESSION_READY:
1323 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1324 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1325 				break;
1326 			}
1327 			do_start_repo_child = 1;
1328 			break;
1329 		case GOTD_IMSG_DISCONNECT:
1330 			do_disconnect = 1;
1331 			break;
1332 		default:
1333 			log_debug("unexpected imsg %d", imsg.hdr.type);
1334 			break;
1335 		}
1336 
1337 		if (!verify_imsg_src(client, proc, &imsg)) {
1338 			log_debug("dropping imsg type %d from PID %d",
1339 			    imsg.hdr.type, proc->pid);
1340 			imsg_free(&imsg);
1341 			continue;
1342 		}
1343 		if (err)
1344 			log_warnx("uid %d: %s", client->euid, err->msg);
1345 
1346 		if (do_start_repo_child) {
1347 			struct gotd_repo *repo;
1348 			const char *name = client->session->repo_name;
1349 
1350 			repo = gotd_find_repo_by_name(name, &gotd);
1351 			if (repo != NULL) {
1352 				enum gotd_procid proc_type;
1353 
1354 				if (client->required_auth & GOTD_AUTH_WRITE)
1355 					proc_type = PROC_REPO_WRITE;
1356 				else
1357 					proc_type = PROC_REPO_READ;
1358 
1359 				err = start_repo_child(client, proc_type, repo,
1360 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1361 				    gotd.verbosity);
1362 			} else
1363 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1364 
1365 			if (err) {
1366 				log_warnx("uid %d: %s", client->euid, err->msg);
1367 				do_disconnect = 1;
1368 			}
1369 		}
1370 
1371 		if (do_disconnect) {
1372 			if (err)
1373 				disconnect_on_error(client, err);
1374 			else
1375 				disconnect(client);
1376 		}
1377 
1378 		imsg_free(&imsg);
1379 	}
1380 done:
1381 	if (!shut) {
1382 		gotd_imsg_event_add(iev);
1383 	} else {
1384 		/* This pipe is dead. Remove its event handler */
1385 		event_del(&iev->ev);
1386 		disconnect(client);
1387 	}
1388 }
1389 
1390 static void
1391 gotd_dispatch_repo_child(int fd, short event, void *arg)
1392 {
1393 	struct gotd_imsgev *iev = arg;
1394 	struct imsgbuf *ibuf = &iev->ibuf;
1395 	struct gotd_child_proc *proc = NULL;
1396 	struct gotd_client *client;
1397 	ssize_t n;
1398 	int shut = 0;
1399 	struct imsg imsg;
1400 
1401 	client = find_client_by_proc_fd(fd);
1402 	if (client == NULL) {
1403 		/* Can happen during process teardown. */
1404 		warnx("cannot find client for fd %d", fd);
1405 		shut = 1;
1406 		goto done;
1407 	}
1408 
1409 	if (event & EV_READ) {
1410 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1411 			fatal("imsg_read error");
1412 		if (n == 0) {
1413 			/* Connection closed. */
1414 			shut = 1;
1415 			goto done;
1416 		}
1417 	}
1418 
1419 	if (event & EV_WRITE) {
1420 		n = msgbuf_write(&ibuf->w);
1421 		if (n == -1 && errno != EAGAIN)
1422 			fatal("msgbuf_write");
1423 		if (n == 0) {
1424 			/* Connection closed. */
1425 			shut = 1;
1426 			goto done;
1427 		}
1428 	}
1429 
1430 	proc = client->repo;
1431 	if (proc == NULL)
1432 		fatalx("cannot find child process for fd %d", fd);
1433 
1434 	for (;;) {
1435 		const struct got_error *err = NULL;
1436 		uint32_t client_id = 0;
1437 		int do_disconnect = 0;
1438 
1439 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1440 			fatal("%s: imsg_get error", __func__);
1441 		if (n == 0)	/* No more messages. */
1442 			break;
1443 
1444 		switch (imsg.hdr.type) {
1445 		case GOTD_IMSG_ERROR:
1446 			do_disconnect = 1;
1447 			err = gotd_imsg_recv_error(&client_id, &imsg);
1448 			break;
1449 		case GOTD_IMSG_REPO_CHILD_READY:
1450 			err = connect_session(client);
1451 			if (err)
1452 				break;
1453 			err = connect_repo_child(client, proc);
1454 			break;
1455 		default:
1456 			log_debug("unexpected imsg %d", imsg.hdr.type);
1457 			break;
1458 		}
1459 
1460 		if (!verify_imsg_src(client, proc, &imsg)) {
1461 			log_debug("dropping imsg type %d from PID %d",
1462 			    imsg.hdr.type, proc->pid);
1463 			imsg_free(&imsg);
1464 			continue;
1465 		}
1466 		if (err)
1467 			log_warnx("uid %d: %s", client->euid, err->msg);
1468 
1469 		if (do_disconnect) {
1470 			if (err)
1471 				disconnect_on_error(client, err);
1472 			else
1473 				disconnect(client);
1474 		}
1475 
1476 		imsg_free(&imsg);
1477 	}
1478 done:
1479 	if (!shut) {
1480 		gotd_imsg_event_add(iev);
1481 	} else {
1482 		/* This pipe is dead. Remove its event handler */
1483 		event_del(&iev->ev);
1484 		disconnect(client);
1485 	}
1486 }
1487 
1488 static pid_t
1489 start_child(enum gotd_procid proc_id, const char *repo_path,
1490     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1491 {
1492 	char	*argv[11];
1493 	int	 argc = 0;
1494 	pid_t	 pid;
1495 
1496 	switch (pid = fork()) {
1497 	case -1:
1498 		fatal("cannot fork");
1499 	case 0:
1500 		break;
1501 	default:
1502 		close(fd);
1503 		return pid;
1504 	}
1505 
1506 	if (fd != GOTD_FILENO_MSG_PIPE) {
1507 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1508 			fatal("cannot setup imsg fd");
1509 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1510 		fatal("cannot setup imsg fd");
1511 
1512 	argv[argc++] = argv0;
1513 	switch (proc_id) {
1514 	case PROC_LISTEN:
1515 		argv[argc++] = (char *)"-L";
1516 		break;
1517 	case PROC_AUTH:
1518 		argv[argc++] = (char *)"-A";
1519 		break;
1520 	case PROC_SESSION_READ:
1521 		argv[argc++] = (char *)"-s";
1522 		break;
1523 	case PROC_SESSION_WRITE:
1524 		argv[argc++] = (char *)"-S";
1525 		break;
1526 	case PROC_REPO_READ:
1527 		argv[argc++] = (char *)"-R";
1528 		break;
1529 	case PROC_REPO_WRITE:
1530 		argv[argc++] = (char *)"-W";
1531 		break;
1532 	default:
1533 		fatalx("invalid process id %d", proc_id);
1534 	}
1535 
1536 	argv[argc++] = (char *)"-f";
1537 	argv[argc++] = (char *)confpath;
1538 
1539 	if (repo_path) {
1540 		argv[argc++] = (char *)"-P";
1541 		argv[argc++] = (char *)repo_path;
1542 	}
1543 
1544 	if (!daemonize)
1545 		argv[argc++] = (char *)"-d";
1546 	if (verbosity > 0)
1547 		argv[argc++] = (char *)"-v";
1548 	if (verbosity > 1)
1549 		argv[argc++] = (char *)"-v";
1550 	argv[argc++] = NULL;
1551 
1552 	execvp(argv0, argv);
1553 	fatal("execvp");
1554 }
1555 
1556 static void
1557 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1558 {
1559 	struct gotd_child_proc *proc;
1560 
1561 	proc = calloc(1, sizeof(*proc));
1562 	if (proc == NULL)
1563 		fatal("calloc");
1564 
1565 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1566 
1567 	/* proc->tmo is initialized in main() after event_init() */
1568 
1569 	proc->type = PROC_LISTEN;
1570 
1571 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1572 	    PF_UNSPEC, proc->pipe) == -1)
1573 		fatal("socketpair");
1574 
1575 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1576 	    proc->pipe[1], daemonize, verbosity);
1577 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1578 	proc->iev.handler = gotd_dispatch_listener;
1579 	proc->iev.events = EV_READ;
1580 	proc->iev.handler_arg = NULL;
1581 
1582 	gotd.listen_proc = proc;
1583 }
1584 
1585 static const struct got_error *
1586 start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1587     char *argv0, const char *confpath, int daemonize, int verbosity)
1588 {
1589 	struct gotd_child_proc *proc;
1590 
1591 	proc = calloc(1, sizeof(*proc));
1592 	if (proc == NULL)
1593 		return got_error_from_errno("calloc");
1594 
1595 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1596 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1597 
1598 	if (client_is_reading(client))
1599 		proc->type = PROC_SESSION_READ;
1600 	else
1601 		proc->type = PROC_SESSION_WRITE;
1602 	if (strlcpy(proc->repo_name, repo->name,
1603 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1604 		fatalx("repository name too long: %s", repo->name);
1605 	log_debug("starting client uid %d session for repository %s",
1606 	    client->euid, repo->name);
1607 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1608 	    sizeof(proc->repo_path))
1609 		fatalx("repository path too long: %s", repo->path);
1610 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1611 	    PF_UNSPEC, proc->pipe) == -1)
1612 		fatal("socketpair");
1613 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1614 	    confpath, proc->pipe[1], daemonize, verbosity);
1615 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1616 	log_debug("proc %s %s is on fd %d",
1617 	    gotd_proc_names[proc->type], proc->repo_path,
1618 	    proc->pipe[0]);
1619 	proc->iev.handler = gotd_dispatch_client_session;
1620 	proc->iev.events = EV_READ;
1621 	proc->iev.handler_arg = NULL;
1622 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1623 	    gotd_dispatch_client_session, &proc->iev);
1624 	gotd_imsg_event_add(&proc->iev);
1625 
1626 	client->session = proc;
1627 	return NULL;
1628 }
1629 
1630 static const struct got_error *
1631 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1632     struct gotd_repo *repo, char *argv0, const char *confpath,
1633     int daemonize, int verbosity)
1634 {
1635 	struct gotd_child_proc *proc;
1636 
1637 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1638 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1639 
1640 	proc = calloc(1, sizeof(*proc));
1641 	if (proc == NULL)
1642 		return got_error_from_errno("calloc");
1643 
1644 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1645 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1646 
1647 	proc->type = proc_type;
1648 	if (strlcpy(proc->repo_name, repo->name,
1649 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1650 		fatalx("repository name too long: %s", repo->name);
1651 	log_debug("starting %s for repository %s",
1652 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1653 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1654 	    sizeof(proc->repo_path))
1655 		fatalx("repository path too long: %s", repo->path);
1656 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1657 	    PF_UNSPEC, proc->pipe) == -1)
1658 		fatal("socketpair");
1659 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1660 	    confpath, proc->pipe[1], daemonize, verbosity);
1661 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1662 	log_debug("proc %s %s is on fd %d",
1663 	    gotd_proc_names[proc->type], proc->repo_path,
1664 	    proc->pipe[0]);
1665 	proc->iev.handler = gotd_dispatch_repo_child;
1666 	proc->iev.events = EV_READ;
1667 	proc->iev.handler_arg = NULL;
1668 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1669 	    gotd_dispatch_repo_child, &proc->iev);
1670 	gotd_imsg_event_add(&proc->iev);
1671 
1672 	client->repo = proc;
1673 	return NULL;
1674 }
1675 
1676 static const struct got_error *
1677 start_auth_child(struct gotd_client *client, int required_auth,
1678     struct gotd_repo *repo, char *argv0, const char *confpath,
1679     int daemonize, int verbosity)
1680 {
1681 	const struct got_error *err = NULL;
1682 	struct gotd_child_proc *proc;
1683 	struct gotd_imsg_auth iauth;
1684 	int fd;
1685 
1686 	memset(&iauth, 0, sizeof(iauth));
1687 
1688 	fd = dup(client->fd);
1689 	if (fd == -1)
1690 		return got_error_from_errno("dup");
1691 
1692 	proc = calloc(1, sizeof(*proc));
1693 	if (proc == NULL) {
1694 		err = got_error_from_errno("calloc");
1695 		close(fd);
1696 		return err;
1697 	}
1698 
1699 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1700 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1701 
1702 	proc->type = PROC_AUTH;
1703 	if (strlcpy(proc->repo_name, repo->name,
1704 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1705 		fatalx("repository name too long: %s", repo->name);
1706 	log_debug("starting auth for uid %d repository %s",
1707 	    client->euid, repo->name);
1708 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1709 	    sizeof(proc->repo_path))
1710 		fatalx("repository path too long: %s", repo->path);
1711 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1712 	    PF_UNSPEC, proc->pipe) == -1)
1713 		fatal("socketpair");
1714 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1715 	    confpath, proc->pipe[1], daemonize, verbosity);
1716 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1717 	log_debug("proc %s %s is on fd %d",
1718 	    gotd_proc_names[proc->type], proc->repo_path,
1719 	    proc->pipe[0]);
1720 	proc->iev.handler = gotd_dispatch_auth_child;
1721 	proc->iev.events = EV_READ;
1722 	proc->iev.handler_arg = NULL;
1723 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1724 	    gotd_dispatch_auth_child, &proc->iev);
1725 	gotd_imsg_event_add(&proc->iev);
1726 
1727 	iauth.euid = client->euid;
1728 	iauth.egid = client->egid;
1729 	iauth.required_auth = required_auth;
1730 	iauth.client_id = client->id;
1731 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1732 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1733 		log_warn("imsg compose AUTHENTICATE");
1734 		close(fd);
1735 		/* Let the auth_timeout handler tidy up. */
1736 	}
1737 
1738 	client->auth = proc;
1739 	client->required_auth = required_auth;
1740 	return NULL;
1741 }
1742 
1743 static void
1744 apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1745 {
1746 	if (need_tmpdir) {
1747 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1748 			fatal("unveil %s", GOT_TMPDIR_STR);
1749 	}
1750 
1751 	if (unveil(repo_path, "r") == -1)
1752 		fatal("unveil %s", repo_path);
1753 
1754 	if (unveil(NULL, NULL) == -1)
1755 		fatal("unveil");
1756 }
1757 
1758 static void
1759 apply_unveil_repo_readwrite(const char *repo_path)
1760 {
1761 	if (unveil(repo_path, "rwc") == -1)
1762 		fatal("unveil %s", repo_path);
1763 
1764 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1765 		fatal("unveil %s", GOT_TMPDIR_STR);
1766 
1767 	if (unveil(NULL, NULL) == -1)
1768 		fatal("unveil");
1769 }
1770 
1771 static void
1772 apply_unveil_none(void)
1773 {
1774 	if (unveil("/", "") == -1)
1775 		fatal("unveil");
1776 
1777 	if (unveil(NULL, NULL) == -1)
1778 		fatal("unveil");
1779 }
1780 
1781 static void
1782 apply_unveil_selfexec(void)
1783 {
1784 	if (unveil(gotd.argv0, "x") == -1)
1785 		fatal("unveil %s", gotd.argv0);
1786 
1787 	if (unveil(NULL, NULL) == -1)
1788 		fatal("unveil");
1789 }
1790 
1791 int
1792 main(int argc, char **argv)
1793 {
1794 	const struct got_error *error = NULL;
1795 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1796 	const char *confpath = GOTD_CONF_PATH;
1797 	char *argv0 = argv[0];
1798 	char title[2048];
1799 	struct passwd *pw = NULL;
1800 	char *repo_path = NULL;
1801 	enum gotd_procid proc_id = PROC_GOTD;
1802 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1803 	int *pack_fds = NULL, *temp_fds = NULL;
1804 	struct gotd_repo *repo = NULL;
1805 
1806 	TAILQ_INIT(&procs);
1807 
1808 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1809 
1810 	while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1811 		switch (ch) {
1812 		case 'A':
1813 			proc_id = PROC_AUTH;
1814 			break;
1815 		case 'd':
1816 			daemonize = 0;
1817 			break;
1818 		case 'f':
1819 			confpath = optarg;
1820 			break;
1821 		case 'L':
1822 			proc_id = PROC_LISTEN;
1823 			break;
1824 		case 'n':
1825 			noaction = 1;
1826 			break;
1827 		case 'P':
1828 			repo_path = realpath(optarg, NULL);
1829 			if (repo_path == NULL)
1830 				fatal("realpath '%s'", optarg);
1831 			break;
1832 		case 'R':
1833 			proc_id = PROC_REPO_READ;
1834 			break;
1835 		case 's':
1836 			proc_id = PROC_SESSION_READ;
1837 			break;
1838 		case 'S':
1839 			proc_id = PROC_SESSION_WRITE;
1840 			break;
1841 		case 'v':
1842 			if (verbosity < 3)
1843 				verbosity++;
1844 			break;
1845 		case 'W':
1846 			proc_id = PROC_REPO_WRITE;
1847 			break;
1848 		default:
1849 			usage();
1850 		}
1851 	}
1852 
1853 	argc -= optind;
1854 	argv += optind;
1855 
1856 	if (argc != 0)
1857 		usage();
1858 
1859 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1860 		fatalx("need root privileges");
1861 
1862 	if (parse_config(confpath, proc_id, &gotd) != 0)
1863 		return 1;
1864 
1865 	pw = getpwnam(gotd.user_name);
1866 	if (pw == NULL)
1867 		fatalx("user %s not found", gotd.user_name);
1868 
1869 	if (pw->pw_uid == 0)
1870 		fatalx("cannot run %s as the superuser", getprogname());
1871 
1872 	if (noaction) {
1873 		fprintf(stderr, "configuration OK\n");
1874 		return 0;
1875 	}
1876 
1877 	gotd.argv0 = argv0;
1878 	gotd.daemonize = daemonize;
1879 	gotd.verbosity = verbosity;
1880 	gotd.confpath = confpath;
1881 
1882 	/* Require an absolute path in argv[0] for reliable re-exec. */
1883 	if (!got_path_is_absolute(argv0))
1884 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1885 
1886 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1887 	log_setverbose(verbosity);
1888 
1889 	if (proc_id == PROC_GOTD) {
1890 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1891 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1892 		if (daemonize && daemon(1, 0) == -1)
1893 			fatal("daemon");
1894 		gotd.pid = getpid();
1895 		start_listener(argv0, confpath, daemonize, verbosity);
1896 	} else if (proc_id == PROC_LISTEN) {
1897 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1898 		if (verbosity) {
1899 			log_info("socket: %s", gotd.unix_socket_path);
1900 			log_info("user: %s", pw->pw_name);
1901 		}
1902 
1903 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1904 		    pw->pw_gid);
1905 		if (fd == -1) {
1906 			fatal("cannot listen on unix socket %s",
1907 			    gotd.unix_socket_path);
1908 		}
1909 	} else if (proc_id == PROC_AUTH) {
1910 		snprintf(title, sizeof(title), "%s %s",
1911 		    gotd_proc_names[proc_id], repo_path);
1912 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1913 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1914 		error = got_repo_pack_fds_open(&pack_fds);
1915 		if (error != NULL)
1916 			fatalx("cannot open pack tempfiles: %s", error->msg);
1917 		error = got_repo_temp_fds_open(&temp_fds);
1918 		if (error != NULL)
1919 			fatalx("cannot open pack tempfiles: %s", error->msg);
1920 		if (repo_path == NULL)
1921 			fatalx("repository path not specified");
1922 		snprintf(title, sizeof(title), "%s %s",
1923 		    gotd_proc_names[proc_id], repo_path);
1924 	} else
1925 		fatal("invalid process id %d", proc_id);
1926 
1927 	setproctitle("%s", title);
1928 	log_procinit(title);
1929 
1930 	/* Drop root privileges. */
1931 	if (setgid(pw->pw_gid) == -1)
1932 		fatal("setgid %d failed", pw->pw_gid);
1933 	if (setuid(pw->pw_uid) == -1)
1934 		fatal("setuid %d failed", pw->pw_uid);
1935 
1936 	event_init();
1937 
1938 	switch (proc_id) {
1939 	case PROC_GOTD:
1940 #ifndef PROFILE
1941 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1942 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1943 			err(1, "pledge");
1944 #endif
1945 		break;
1946 	case PROC_LISTEN:
1947 #ifndef PROFILE
1948 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1949 			err(1, "pledge");
1950 #endif
1951 		/*
1952 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1953 		 * sockets by revoking all filesystem access via unveil(2).
1954 		 */
1955 		apply_unveil_none();
1956 
1957 		listen_main(title, fd, gotd.connection_limits,
1958 		    gotd.nconnection_limits);
1959 		/* NOTREACHED */
1960 		break;
1961 	case PROC_AUTH:
1962 #ifndef PROFILE
1963 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1964 			err(1, "pledge");
1965 #endif
1966 		/*
1967 		 * We need the "unix" pledge promise for getpeername(2) only.
1968 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
1969 		 * filesystem access via unveil(2). Access to password database
1970 		 * files will still work since "getpw" bypasses unveil(2).
1971 		 */
1972 		apply_unveil_none();
1973 
1974 		auth_main(title, &gotd.repos, repo_path);
1975 		/* NOTREACHED */
1976 		break;
1977 	case PROC_SESSION_READ:
1978 	case PROC_SESSION_WRITE:
1979 #ifndef PROFILE
1980 		/*
1981 		 * The "recvfd" promise is only needed during setup and
1982 		 * will be removed in a later pledge(2) call.
1983 		 */
1984 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
1985 		    "unveil", NULL) == -1)
1986 			err(1, "pledge");
1987 #endif
1988 		if (proc_id == PROC_SESSION_READ)
1989 			apply_unveil_repo_readonly(repo_path, 1);
1990 		else
1991 			apply_unveil_repo_readwrite(repo_path);
1992 		session_main(title, repo_path, pack_fds, temp_fds,
1993 		    &gotd.request_timeout, proc_id);
1994 		/* NOTREACHED */
1995 		break;
1996 	case PROC_REPO_READ:
1997 #ifndef PROFILE
1998 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1999 			err(1, "pledge");
2000 #endif
2001 		apply_unveil_repo_readonly(repo_path, 0);
2002 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2003 		/* NOTREACHED */
2004 		exit(0);
2005 	case PROC_REPO_WRITE:
2006 #ifndef PROFILE
2007 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2008 			err(1, "pledge");
2009 #endif
2010 		apply_unveil_repo_readonly(repo_path, 0);
2011 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2012 		if (repo == NULL)
2013 			fatalx("no repository for path %s", repo_path);
2014 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2015 		    &repo->protected_tag_namespaces,
2016 		    &repo->protected_branch_namespaces,
2017 		    &repo->protected_branches);
2018 		/* NOTREACHED */
2019 		exit(0);
2020 	default:
2021 		fatal("invalid process id %d", proc_id);
2022 	}
2023 
2024 	if (proc_id != PROC_GOTD)
2025 		fatal("invalid process id %d", proc_id);
2026 
2027 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2028 	    gotd.listen_proc);
2029 
2030 	apply_unveil_selfexec();
2031 
2032 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2033 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2034 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2035 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2036 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2037 	signal(SIGPIPE, SIG_IGN);
2038 
2039 	signal_add(&evsigint, NULL);
2040 	signal_add(&evsigterm, NULL);
2041 	signal_add(&evsighup, NULL);
2042 	signal_add(&evsigusr1, NULL);
2043 	signal_add(&evsigchld, NULL);
2044 
2045 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2046 
2047 	event_dispatch();
2048 
2049 	free(repo_path);
2050 	gotd_shutdown();
2051 
2052 	return 0;
2053 }