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Date:: Wed Aug 23 11:28:31 2023 UTC
Message:: portable: gotd: listen Include listen.c; make it portable.
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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/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 <stdarg.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <syslog.h>
38 #include <unistd.h>
39 
40 #include "got_error.h"
41 #include "got_opentemp.h"
42 #include "got_path.h"
43 #include "got_repository.h"
44 #include "got_object.h"
45 #include "got_reference.h"
46 
47 #include "got_lib_delta.h"
48 #include "got_lib_object.h"
49 #include "got_lib_object_cache.h"
50 #include "got_lib_hash.h"
51 #include "got_lib_gitproto.h"
52 #include "got_lib_pack.h"
53 #include "got_lib_repository.h"
54 
55 #include "gotd.h"
56 #include "log.h"
57 #include "listen.h"
58 #include "auth.h"
59 #include "session.h"
60 #include "repo_read.h"
61 #include "repo_write.h"
62 
63 #ifndef nitems
64 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
65 #endif
66 
67 enum gotd_client_state {
68 	GOTD_CLIENT_STATE_NEW,
69 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
70 };
71 
72 struct gotd_child_proc {
73 	pid_t				 pid;
74 	enum gotd_procid		 type;
75 	char				 repo_name[NAME_MAX];
76 	char				 repo_path[PATH_MAX];
77 	int				 pipe[2];
78 	struct gotd_imsgev		 iev;
79 	struct event			 tmo;
80 
81 	TAILQ_ENTRY(gotd_child_proc)	 entry;
82 };
83 TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
84 
85 struct gotd_client {
86 	STAILQ_ENTRY(gotd_client)	 entry;
87 	enum gotd_client_state		 state;
88 	uint32_t			 id;
89 	int				 fd;
90 	struct gotd_imsgev		 iev;
91 	struct event			 tmo;
92 	uid_t				 euid;
93 	gid_t				 egid;
94 	struct gotd_child_proc		*repo;
95 	struct gotd_child_proc		*auth;
96 	struct gotd_child_proc		*session;
97 	int				 required_auth;
98 };
99 STAILQ_HEAD(gotd_clients, gotd_client);
100 
101 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
102 static SIPHASH_KEY clients_hash_key;
103 volatile int client_cnt;
104 static struct timeval auth_timeout = { 5, 0 };
105 static struct gotd gotd;
106 
107 void gotd_sighdlr(int sig, short event, void *arg);
108 static void gotd_shutdown(void);
109 static const struct got_error *start_session_child(struct gotd_client *,
110     struct gotd_repo *, char *, const char *, int, int);
111 static const struct got_error *start_repo_child(struct gotd_client *,
112     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
113 static const struct got_error *start_auth_child(struct gotd_client *, int,
114     struct gotd_repo *, char *, const char *, int, int);
115 static void kill_proc(struct gotd_child_proc *, int);
116 static void disconnect(struct gotd_client *);
117 
118 __dead static void
119 usage(void)
120 {
121 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
122 	exit(1);
123 }
124 
125 static int
126 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
127 {
128 	struct sockaddr_un sun;
129 	int fd = -1;
130 	mode_t old_umask, mode;
131 	int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
132 
133 #ifdef SOCK_CLOEXEC
134 	sock_flags |= SOCK_CLOEXEC;
135 #endif
136 
137 	fd = socket(AF_UNIX, sock_flags, 0);
138 	if (fd == -1) {
139 		log_warn("socket");
140 		return -1;
141 	}
142 
143 	sun.sun_family = AF_UNIX;
144 	if (strlcpy(sun.sun_path, unix_socket_path,
145 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
146 		log_warnx("%s: name too long", unix_socket_path);
147 		close(fd);
148 		return -1;
149 	}
150 
151 	if (unlink(unix_socket_path) == -1) {
152 		if (errno != ENOENT) {
153 			log_warn("unlink %s", unix_socket_path);
154 			close(fd);
155 			return -1;
156 		}
157 	}
158 
159 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
160 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
161 
162 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
163 		log_warn("bind: %s", unix_socket_path);
164 		close(fd);
165 		umask(old_umask);
166 		return -1;
167 	}
168 
169 	umask(old_umask);
170 
171 	if (chmod(unix_socket_path, mode) == -1) {
172 		log_warn("chmod %o %s", mode, unix_socket_path);
173 		close(fd);
174 		unlink(unix_socket_path);
175 		return -1;
176 	}
177 
178 	if (chown(unix_socket_path, uid, gid) == -1) {
179 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
180 		close(fd);
181 		unlink(unix_socket_path);
182 		return -1;
183 	}
184 
185 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
186 		log_warn("listen");
187 		close(fd);
188 		unlink(unix_socket_path);
189 		return -1;
190 	}
191 
192 	return fd;
193 }
194 
195 static uint64_t
196 client_hash(uint32_t client_id)
197 {
198 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
199 }
200 
201 static void
202 add_client(struct gotd_client *client)
203 {
204 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
205 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
206 	client_cnt++;
207 }
208 
209 static struct gotd_client *
210 find_client(uint32_t client_id)
211 {
212 	uint64_t slot;
213 	struct gotd_client *c;
214 
215 	slot = client_hash(client_id) % nitems(gotd_clients);
216 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
217 		if (c->id == client_id)
218 			return c;
219 	}
220 
221 	return NULL;
222 }
223 
224 static struct gotd_client *
225 find_client_by_proc_fd(int fd)
226 {
227 	uint64_t slot;
228 
229 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
230 		struct gotd_client *c;
231 
232 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
233 			if (c->repo && c->repo->iev.ibuf.fd == fd)
234 				return c;
235 			if (c->auth && c->auth->iev.ibuf.fd == fd)
236 				return c;
237 			if (c->session && c->session->iev.ibuf.fd == fd)
238 				return c;
239 		}
240 	}
241 
242 	return NULL;
243 }
244 
245 static int
246 client_is_reading(struct gotd_client *client)
247 {
248 	return (client->required_auth &
249 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
250 }
251 
252 static int
253 client_is_writing(struct gotd_client *client)
254 {
255 	return (client->required_auth &
256 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
257 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
258 }
259 
260 static const struct got_error *
261 ensure_client_is_not_writing(struct gotd_client *client)
262 {
263 	if (client_is_writing(client)) {
264 		return got_error_fmt(GOT_ERR_BAD_PACKET,
265 		    "uid %d made a read-request but is writing to "
266 		    "a repository", client->euid);
267 	}
268 
269 	return NULL;
270 }
271 
272 static const struct got_error *
273 ensure_client_is_not_reading(struct gotd_client *client)
274 {
275 	if (client_is_reading(client)) {
276 		return got_error_fmt(GOT_ERR_BAD_PACKET,
277 		    "uid %d made a write-request but is reading from "
278 		    "a repository", client->euid);
279 	}
280 
281 	return NULL;
282 }
283 
284 static void
285 proc_done(struct gotd_child_proc *proc)
286 {
287 	struct gotd_client *client;
288 
289 	TAILQ_REMOVE(&procs, proc, entry);
290 
291 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
292 	if (client != NULL) {
293 		if (proc == client->repo)
294 			client->repo = NULL;
295 		if (proc == client->auth)
296 			client->auth = NULL;
297 		if (proc == client->session)
298 			client->session = NULL;
299 		disconnect(client);
300 	}
301 
302 	evtimer_del(&proc->tmo);
303 
304 	if (proc->iev.ibuf.fd != -1) {
305 		event_del(&proc->iev.ev);
306 		msgbuf_clear(&proc->iev.ibuf.w);
307 		close(proc->iev.ibuf.fd);
308 	}
309 
310 	free(proc);
311 }
312 
313 static void
314 kill_repo_proc(struct gotd_client *client)
315 {
316 	if (client->repo == NULL)
317 		return;
318 
319 	kill_proc(client->repo, 0);
320 	client->repo = NULL;
321 }
322 
323 static void
324 kill_auth_proc(struct gotd_client *client)
325 {
326 	if (client->auth == NULL)
327 		return;
328 
329 	kill_proc(client->auth, 0);
330 	client->auth = NULL;
331 }
332 
333 static void
334 kill_session_proc(struct gotd_client *client)
335 {
336 	if (client->session == NULL)
337 		return;
338 
339 	kill_proc(client->session, 0);
340 	client->session = NULL;
341 }
342 
343 static void
344 disconnect(struct gotd_client *client)
345 {
346 	struct gotd_imsg_disconnect idisconnect;
347 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
348 	uint64_t slot;
349 
350 	log_debug("uid %d: disconnecting", client->euid);
351 
352 	kill_auth_proc(client);
353 	kill_session_proc(client);
354 	kill_repo_proc(client);
355 
356 	idisconnect.client_id = client->id;
357 	if (gotd_imsg_compose_event(&listen_proc->iev,
358 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
359 	    &idisconnect, sizeof(idisconnect)) == -1)
360 		log_warn("imsg compose DISCONNECT");
361 
362 	slot = client_hash(client->id) % nitems(gotd_clients);
363 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
364 	imsg_clear(&client->iev.ibuf);
365 	event_del(&client->iev.ev);
366 	evtimer_del(&client->tmo);
367 	if (client->fd != -1)
368 		close(client->fd);
369 	else if (client->iev.ibuf.fd != -1)
370 		close(client->iev.ibuf.fd);
371 	free(client);
372 	client_cnt--;
373 }
374 
375 static void
376 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
377 {
378 	struct imsgbuf ibuf;
379 
380 	if (err->code != GOT_ERR_EOF) {
381 		log_warnx("uid %d: %s", client->euid, err->msg);
382 		if (client->fd != -1) {
383 			imsg_init(&ibuf, client->fd);
384 			gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
385 			imsg_clear(&ibuf);
386 		}
387 	}
388 	disconnect(client);
389 }
390 
391 static const struct got_error *
392 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
393 {
394 	const struct got_error *err = NULL;
395 	struct gotd_imsg_info_repo irepo;
396 
397 	memset(&irepo, 0, sizeof(irepo));
398 
399 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
400 	    >= sizeof(irepo.repo_name))
401 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
402 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
403 	    >= sizeof(irepo.repo_path))
404 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
405 
406 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
407 	    &irepo, sizeof(irepo)) == -1) {
408 		err = got_error_from_errno("imsg compose INFO_REPO");
409 		if (err)
410 			return err;
411 	}
412 
413 	return NULL;
414 }
415 
416 static const struct got_error *
417 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
418 {
419 	const struct got_error *err = NULL;
420 	struct gotd_imsg_info_client iclient;
421 	struct gotd_child_proc *proc;
422 
423 	memset(&iclient, 0, sizeof(iclient));
424 	iclient.euid = client->euid;
425 	iclient.egid = client->egid;
426 
427 	proc = client->repo;
428 	if (proc) {
429 		if (strlcpy(iclient.repo_name, proc->repo_path,
430 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
431 			return got_error_msg(GOT_ERR_NO_SPACE,
432 			    "repo name too long");
433 		}
434 		if (client_is_writing(client))
435 			iclient.is_writing = 1;
436 
437 		iclient.repo_child_pid = proc->pid;
438 	}
439 
440 	if (client->session)
441 		iclient.session_child_pid = client->session->pid;
442 
443 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
444 	    &iclient, sizeof(iclient)) == -1) {
445 		err = got_error_from_errno("imsg compose INFO_CLIENT");
446 		if (err)
447 			return err;
448 	}
449 
450 	return NULL;
451 }
452 
453 static const struct got_error *
454 send_info(struct gotd_client *client)
455 {
456 	const struct got_error *err = NULL;
457 	struct gotd_imsg_info info;
458 	uint64_t slot;
459 	struct gotd_repo *repo;
460 
461 	if (client->euid != 0)
462 		return got_error_set_errno(EPERM, "info");
463 
464 	info.pid = gotd.pid;
465 	info.verbosity = gotd.verbosity;
466 	info.nrepos = gotd.nrepos;
467 	info.nclients = client_cnt - 1;
468 
469 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
470 	    &info, sizeof(info)) == -1) {
471 		err = got_error_from_errno("imsg compose INFO");
472 		if (err)
473 			return err;
474 	}
475 
476 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
477 		err = send_repo_info(&client->iev, repo);
478 		if (err)
479 			return err;
480 	}
481 
482 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
483 		struct gotd_client *c;
484 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
485 			if (c->id == client->id)
486 				continue;
487 			err = send_client_info(&client->iev, c);
488 			if (err)
489 				return err;
490 		}
491 	}
492 
493 	return NULL;
494 }
495 
496 static const struct got_error *
497 stop_gotd(struct gotd_client *client)
498 {
499 
500 	if (client->euid != 0)
501 		return got_error_set_errno(EPERM, "stop");
502 
503 	gotd_shutdown();
504 	/* NOTREACHED */
505 	return NULL;
506 }
507 
508 static const struct got_error *
509 start_client_authentication(struct gotd_client *client, struct imsg *imsg)
510 {
511 	const struct got_error *err;
512 	struct gotd_imsg_list_refs ireq;
513 	struct gotd_repo *repo = NULL;
514 	size_t datalen;
515 
516 	log_debug("list-refs request from uid %d", client->euid);
517 
518 	if (client->state != GOTD_CLIENT_STATE_NEW)
519 		return got_error_msg(GOT_ERR_BAD_REQUEST,
520 		    "unexpected list-refs request received");
521 
522 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
523 	if (datalen != sizeof(ireq))
524 		return got_error(GOT_ERR_PRIVSEP_LEN);
525 
526 	memcpy(&ireq, imsg->data, datalen);
527 
528 	if (ireq.client_is_reading) {
529 		err = ensure_client_is_not_writing(client);
530 		if (err)
531 			return err;
532 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
533 		if (repo == NULL)
534 			return got_error(GOT_ERR_NOT_GIT_REPO);
535 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
536 		    gotd.argv0, gotd.confpath, gotd.daemonize,
537 		    gotd.verbosity);
538 		if (err)
539 			return err;
540 	} else {
541 		err = ensure_client_is_not_reading(client);
542 		if (err)
543 			return err;
544 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
545 		if (repo == NULL)
546 			return got_error(GOT_ERR_NOT_GIT_REPO);
547 		err = start_auth_child(client,
548 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
549 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
550 		    gotd.verbosity);
551 		if (err)
552 			return err;
553 	}
554 
555 	evtimer_add(&client->tmo, &auth_timeout);
556 
557 	/* Flow continues upon authentication success/failure or timeout. */
558 	return NULL;
559 }
560 
561 static void
562 gotd_request(int fd, short events, void *arg)
563 {
564 	struct gotd_imsgev *iev = arg;
565 	struct imsgbuf *ibuf = &iev->ibuf;
566 	struct gotd_client *client = iev->handler_arg;
567 	const struct got_error *err = NULL;
568 	struct imsg imsg;
569 	ssize_t n;
570 
571 	if (events & EV_WRITE) {
572 		while (ibuf->w.queued) {
573 			n = msgbuf_write(&ibuf->w);
574 			if (n == -1 && errno == EPIPE) {
575 				/*
576 				 * The client has closed its socket.
577 				 * This can happen when Git clients are
578 				 * done sending pack file data.
579 				 */
580 				msgbuf_clear(&ibuf->w);
581 				continue;
582 			} else if (n == -1 && errno != EAGAIN) {
583 				err = got_error_from_errno("imsg_flush");
584 				disconnect_on_error(client, err);
585 				return;
586 			}
587 			if (n == 0) {
588 				/* Connection closed. */
589 				err = got_error(GOT_ERR_EOF);
590 				disconnect_on_error(client, err);
591 				return;
592 			}
593 		}
594 
595 		/* Disconnect gotctl(8) now that messages have been sent. */
596 		if (!client_is_reading(client) && !client_is_writing(client)) {
597 			disconnect(client);
598 			return;
599 		}
600 	}
601 
602 	if ((events & EV_READ) == 0)
603 		return;
604 
605 	memset(&imsg, 0, sizeof(imsg));
606 
607 	while (err == NULL) {
608 		err = gotd_imsg_recv(&imsg, ibuf, 0);
609 		if (err) {
610 			if (err->code == GOT_ERR_PRIVSEP_READ)
611 				err = NULL;
612 			break;
613 		}
614 
615 		evtimer_del(&client->tmo);
616 
617 		switch (imsg.hdr.type) {
618 		case GOTD_IMSG_INFO:
619 			err = send_info(client);
620 			break;
621 		case GOTD_IMSG_STOP:
622 			err = stop_gotd(client);
623 			break;
624 		case GOTD_IMSG_LIST_REFS:
625 			err = start_client_authentication(client, &imsg);
626 			break;
627 		default:
628 			log_debug("unexpected imsg %d", imsg.hdr.type);
629 			err = got_error(GOT_ERR_PRIVSEP_MSG);
630 			break;
631 		}
632 
633 		imsg_free(&imsg);
634 	}
635 
636 	if (err) {
637 		disconnect_on_error(client, err);
638 	} else {
639 		gotd_imsg_event_add(&client->iev);
640 	}
641 }
642 
643 static void
644 gotd_auth_timeout(int fd, short events, void *arg)
645 {
646 	struct gotd_client *client = arg;
647 
648 	log_debug("disconnecting uid %d due to authentication timeout",
649 	    client->euid);
650 	disconnect(client);
651 }
652 
653 static const struct got_error *
654 recv_connect(uint32_t *client_id, struct imsg *imsg)
655 {
656 	const struct got_error *err = NULL;
657 	struct gotd_imsg_connect iconnect;
658 	size_t datalen;
659 	int s = -1;
660 	struct gotd_client *client = NULL;
661 
662 	*client_id = 0;
663 
664 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
665 	if (datalen != sizeof(iconnect))
666 		return got_error(GOT_ERR_PRIVSEP_LEN);
667 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
668 
669 	s = imsg->fd;
670 	if (s == -1) {
671 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
672 		goto done;
673 	}
674 
675 	if (find_client(iconnect.client_id)) {
676 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
677 		goto done;
678 	}
679 
680 	client = calloc(1, sizeof(*client));
681 	if (client == NULL) {
682 		err = got_error_from_errno("calloc");
683 		goto done;
684 	}
685 
686 	*client_id = iconnect.client_id;
687 
688 	client->state = GOTD_CLIENT_STATE_NEW;
689 	client->id = iconnect.client_id;
690 	client->fd = s;
691 	s = -1;
692 	/* The auth process will verify UID/GID for us. */
693 	client->euid = iconnect.euid;
694 	client->egid = iconnect.egid;
695 
696 	imsg_init(&client->iev.ibuf, client->fd);
697 	client->iev.handler = gotd_request;
698 	client->iev.events = EV_READ;
699 	client->iev.handler_arg = client;
700 
701 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
702 	    &client->iev);
703 	gotd_imsg_event_add(&client->iev);
704 
705 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
706 
707 	add_client(client);
708 	log_debug("%s: new client uid %d connected on fd %d", __func__,
709 	    client->euid, client->fd);
710 done:
711 	if (err) {
712 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
713 		struct gotd_imsg_disconnect idisconnect;
714 
715 		idisconnect.client_id = client->id;
716 		if (gotd_imsg_compose_event(&listen_proc->iev,
717 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
718 		    &idisconnect, sizeof(idisconnect)) == -1)
719 			log_warn("imsg compose DISCONNECT");
720 
721 		if (s != -1)
722 			close(s);
723 	}
724 
725 	return err;
726 }
727 
728 static const char *gotd_proc_names[PROC_MAX] = {
729 	"parent",
730 	"listen",
731 	"auth",
732 	"session_read",
733 	"session_write",
734 	"repo_read",
735 	"repo_write",
736 	"gitwrapper"
737 };
738 
739 static void
740 kill_proc(struct gotd_child_proc *proc, int fatal)
741 {
742 	struct timeval tv = { 5, 0 };
743 
744 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
745 
746 	if (proc->iev.ibuf.fd != -1) {
747 		event_del(&proc->iev.ev);
748 		msgbuf_clear(&proc->iev.ibuf.w);
749 		close(proc->iev.ibuf.fd);
750 		proc->iev.ibuf.fd = -1;
751 	}
752 
753 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
754 		evtimer_add(&proc->tmo, &tv);
755 
756 	if (fatal) {
757 		log_warnx("sending SIGKILL to PID %d", proc->pid);
758 		kill(proc->pid, SIGKILL);
759 	} else
760 		kill(proc->pid, SIGTERM);
761 }
762 
763 static void
764 kill_proc_timeout(int fd, short ev, void *d)
765 {
766 	struct gotd_child_proc *proc = d;
767 
768 	log_warnx("timeout waiting for PID %d to terminate;"
769 	    " retrying with force", proc->pid);
770 	kill_proc(proc, 1);
771 }
772 
773 static void
774 gotd_shutdown(void)
775 {
776 	uint64_t slot;
777 
778 	log_debug("shutting down");
779 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
780 		struct gotd_client *c, *tmp;
781 
782 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
783 			disconnect(c);
784 	}
785 
786 	kill_proc(gotd.listen_proc, 0);
787 
788 	log_info("terminating");
789 	exit(0);
790 }
791 
792 static struct gotd_child_proc *
793 find_proc_by_pid(pid_t pid)
794 {
795 	struct gotd_child_proc *proc = NULL;
796 
797 	TAILQ_FOREACH(proc, &procs, entry)
798 		if (proc->pid == pid)
799 			break;
800 
801 	return proc;
802 }
803 
804 void
805 gotd_sighdlr(int sig, short event, void *arg)
806 {
807 	struct gotd_child_proc *proc;
808 	pid_t pid;
809 	int status;
810 
811 	/*
812 	 * Normal signal handler rules don't apply because libevent
813 	 * decouples for us.
814 	 */
815 
816 	switch (sig) {
817 	case SIGHUP:
818 		log_info("%s: ignoring SIGHUP", __func__);
819 		break;
820 	case SIGUSR1:
821 		log_info("%s: ignoring SIGUSR1", __func__);
822 		break;
823 	case SIGTERM:
824 	case SIGINT:
825 		gotd_shutdown();
826 		break;
827 	case SIGCHLD:
828 		for (;;) {
829 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
830 			if (pid == -1) {
831 				if (errno == EINTR)
832 					continue;
833 				if (errno == ECHILD)
834 					break;
835 				fatal("waitpid");
836 			}
837 			if (pid == 0)
838 				break;
839 
840 			log_debug("reaped pid %d", pid);
841 			proc = find_proc_by_pid(pid);
842 			if (proc == NULL) {
843 				log_info("caught exit of unknown child %d",
844 				    pid);
845 				continue;
846 			}
847 
848 			if (WIFSIGNALED(status)) {
849 				log_warnx("child PID %d terminated with"
850 				    " signal %d", pid, WTERMSIG(status));
851 			}
852 
853 			proc_done(proc);
854 		}
855 		break;
856 	default:
857 		fatalx("unexpected signal");
858 	}
859 }
860 
861 static const struct got_error *
862 ensure_proc_is_reading(struct gotd_client *client,
863     struct gotd_child_proc *proc)
864 {
865 	if (!client_is_reading(client)) {
866 		kill_proc(proc, 1);
867 		return got_error_fmt(GOT_ERR_BAD_PACKET,
868 		    "PID %d handled a read-request for uid %d but this "
869 		    "user is not reading from a repository", proc->pid,
870 		    client->euid);
871 	}
872 
873 	return NULL;
874 }
875 
876 static const struct got_error *
877 ensure_proc_is_writing(struct gotd_client *client,
878     struct gotd_child_proc *proc)
879 {
880 	if (!client_is_writing(client)) {
881 		kill_proc(proc, 1);
882 		return got_error_fmt(GOT_ERR_BAD_PACKET,
883 		    "PID %d handled a write-request for uid %d but this "
884 		    "user is not writing to a repository", proc->pid,
885 		    client->euid);
886 	}
887 
888 	return NULL;
889 }
890 
891 static int
892 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
893     struct imsg *imsg)
894 {
895 	const struct got_error *err;
896 	int ret = 0;
897 
898 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
899 		if (client->repo == NULL)
900 			fatalx("no process found for uid %d", client->euid);
901 		if (proc->pid != client->repo->pid) {
902 			kill_proc(proc, 1);
903 			log_warnx("received message from PID %d for uid %d, "
904 			    "while PID %d is the process serving this user",
905 			    proc->pid, client->euid, client->repo->pid);
906 			return 0;
907 		}
908 	}
909 	if (proc->type == PROC_SESSION_READ ||
910 	    proc->type == PROC_SESSION_WRITE) {
911 		if (client->session == NULL) {
912 			log_warnx("no session found for uid %d", client->euid);
913 			return 0;
914 		}
915 		if (proc->pid != client->session->pid) {
916 			kill_proc(proc, 1);
917 			log_warnx("received message from PID %d for uid %d, "
918 			    "while PID %d is the process serving this user",
919 			    proc->pid, client->euid, client->session->pid);
920 			return 0;
921 		}
922 	}
923 
924 	switch (imsg->hdr.type) {
925 	case GOTD_IMSG_ERROR:
926 		ret = 1;
927 		break;
928 	case GOTD_IMSG_CONNECT:
929 		if (proc->type != PROC_LISTEN) {
930 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
931 			    "new connection for uid %d from PID %d "
932 			    "which is not the listen process",
933 			    proc->pid, client->euid);
934 		} else
935 			ret = 1;
936 		break;
937 	case GOTD_IMSG_ACCESS_GRANTED:
938 		if (proc->type != PROC_AUTH) {
939 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
940 			    "authentication of uid %d from PID %d "
941 			    "which is not the auth process",
942 			    proc->pid, client->euid);
943 		} else
944 			ret = 1;
945 		break;
946 	case GOTD_IMSG_CLIENT_SESSION_READY:
947 		if (proc->type != PROC_SESSION_READ &&
948 		    proc->type != PROC_SESSION_WRITE) {
949 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
950 			    "unexpected \"ready\" signal from PID %d",
951 			    proc->pid);
952 		} else
953 			ret = 1;
954 		break;
955 	case GOTD_IMSG_REPO_CHILD_READY:
956 		if (proc->type != PROC_REPO_READ &&
957 		    proc->type != PROC_REPO_WRITE) {
958 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
959 			    "unexpected \"ready\" signal from PID %d",
960 			    proc->pid);
961 		} else
962 			ret = 1;
963 		break;
964 	case GOTD_IMSG_PACKFILE_DONE:
965 		err = ensure_proc_is_reading(client, proc);
966 		if (err)
967 			log_warnx("uid %d: %s", client->euid, err->msg);
968 		else
969 			ret = 1;
970 		break;
971 	case GOTD_IMSG_PACKFILE_INSTALL:
972 	case GOTD_IMSG_REF_UPDATES_START:
973 	case GOTD_IMSG_REF_UPDATE:
974 		err = ensure_proc_is_writing(client, proc);
975 		if (err)
976 			log_warnx("uid %d: %s", client->euid, err->msg);
977 		else
978 			ret = 1;
979 		break;
980 	default:
981 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
982 		break;
983 	}
984 
985 	return ret;
986 }
987 
988 static const struct got_error *
989 connect_repo_child(struct gotd_client *client,
990     struct gotd_child_proc *repo_proc)
991 {
992 	static const struct got_error *err;
993 	struct gotd_imsgev *session_iev = &client->session->iev;
994 	struct gotd_imsg_connect_repo_child ireq;
995 	int pipe[2];
996 	int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
997 
998 #ifdef SOCK_CLOEXEC
999 	sock_flags |= SOCK_CLOEXEC;
1000 #endif
1001 
1002 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
1003 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1004 		    "unexpected repo child ready signal received");
1005 
1006 	if (socketpair(AF_UNIX, sock_flags, PF_UNSPEC, pipe) == -1)
1007 		fatal("socketpair");
1008 
1009 	memset(&ireq, 0, sizeof(ireq));
1010 	ireq.client_id = client->id;
1011 	ireq.proc_id = repo_proc->type;
1012 
1013 	/* Pass repo child pipe to session child process. */
1014 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1015 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1016 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1017 		close(pipe[0]);
1018 		close(pipe[1]);
1019 		return err;
1020 	}
1021 
1022 	/* Pass session child pipe to repo child process. */
1023 	if (gotd_imsg_compose_event(&repo_proc->iev,
1024 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1025 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1026 		close(pipe[1]);
1027 		return err;
1028 	}
1029 
1030 	return NULL;
1031 }
1032 
1033 static void
1034 gotd_dispatch_listener(int fd, short event, void *arg)
1035 {
1036 	struct gotd_imsgev *iev = arg;
1037 	struct imsgbuf *ibuf = &iev->ibuf;
1038 	struct gotd_child_proc *proc = gotd.listen_proc;
1039 	ssize_t n;
1040 	int shut = 0;
1041 	struct imsg imsg;
1042 
1043 	if (proc->iev.ibuf.fd != fd)
1044 		fatalx("%s: unexpected fd %d", __func__, fd);
1045 
1046 	if (event & EV_READ) {
1047 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1048 			fatal("imsg_read error");
1049 		if (n == 0) {
1050 			/* Connection closed. */
1051 			shut = 1;
1052 			goto done;
1053 		}
1054 	}
1055 
1056 	if (event & EV_WRITE) {
1057 		n = msgbuf_write(&ibuf->w);
1058 		if (n == -1 && errno != EAGAIN)
1059 			fatal("msgbuf_write");
1060 		if (n == 0) {
1061 			/* Connection closed. */
1062 			shut = 1;
1063 			goto done;
1064 		}
1065 	}
1066 
1067 	for (;;) {
1068 		const struct got_error *err = NULL;
1069 		struct gotd_client *client = NULL;
1070 		uint32_t client_id = 0;
1071 		int do_disconnect = 0;
1072 
1073 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1074 			fatal("%s: imsg_get error", __func__);
1075 		if (n == 0)	/* No more messages. */
1076 			break;
1077 
1078 		switch (imsg.hdr.type) {
1079 		case GOTD_IMSG_ERROR:
1080 			do_disconnect = 1;
1081 			err = gotd_imsg_recv_error(&client_id, &imsg);
1082 			break;
1083 		case GOTD_IMSG_CONNECT:
1084 			err = recv_connect(&client_id, &imsg);
1085 			break;
1086 		default:
1087 			log_debug("unexpected imsg %d", imsg.hdr.type);
1088 			break;
1089 		}
1090 
1091 		client = find_client(client_id);
1092 		if (client == NULL) {
1093 			log_warnx("%s: client not found", __func__);
1094 			imsg_free(&imsg);
1095 			continue;
1096 		}
1097 
1098 		if (err)
1099 			log_warnx("uid %d: %s", client->euid, err->msg);
1100 
1101 		if (do_disconnect) {
1102 			if (err)
1103 				disconnect_on_error(client, err);
1104 			else
1105 				disconnect(client);
1106 		}
1107 
1108 		imsg_free(&imsg);
1109 	}
1110 done:
1111 	if (!shut) {
1112 		gotd_imsg_event_add(iev);
1113 	} else {
1114 		/* This pipe is dead. Remove its event handler */
1115 		event_del(&iev->ev);
1116 		event_loopexit(NULL);
1117 	}
1118 }
1119 
1120 static void
1121 gotd_dispatch_auth_child(int fd, short event, void *arg)
1122 {
1123 	const struct got_error *err = NULL;
1124 	struct gotd_imsgev *iev = arg;
1125 	struct imsgbuf *ibuf = &iev->ibuf;
1126 	struct gotd_client *client;
1127 	struct gotd_repo *repo = NULL;
1128 	ssize_t n;
1129 	int shut = 0;
1130 	struct imsg imsg;
1131 	uint32_t client_id = 0;
1132 	int do_disconnect = 0;
1133 
1134 	client = find_client_by_proc_fd(fd);
1135 	if (client == NULL) {
1136 		/* Can happen during process teardown. */
1137 		warnx("cannot find client for fd %d", fd);
1138 		shut = 1;
1139 		goto done;
1140 	}
1141 
1142 	if (client->auth == NULL)
1143 		fatalx("cannot find auth child process for fd %d", fd);
1144 
1145 	if (event & EV_READ) {
1146 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1147 			fatal("imsg_read error");
1148 		if (n == 0) {
1149 			/* Connection closed. */
1150 			shut = 1;
1151 			goto done;
1152 		}
1153 	}
1154 
1155 	if (event & EV_WRITE) {
1156 		n = msgbuf_write(&ibuf->w);
1157 		if (n == -1 && errno != EAGAIN)
1158 			fatal("msgbuf_write");
1159 		if (n == 0) {
1160 			/* Connection closed. */
1161 			shut = 1;
1162 		}
1163 		goto done;
1164 	}
1165 
1166 	if (client->auth->iev.ibuf.fd != fd)
1167 		fatalx("%s: unexpected fd %d", __func__, fd);
1168 
1169 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1170 		fatal("%s: imsg_get error", __func__);
1171 	if (n == 0)	/* No more messages. */
1172 		return;
1173 
1174 	evtimer_del(&client->tmo);
1175 
1176 	switch (imsg.hdr.type) {
1177 	case GOTD_IMSG_ERROR:
1178 		do_disconnect = 1;
1179 		err = gotd_imsg_recv_error(&client_id, &imsg);
1180 		break;
1181 	case GOTD_IMSG_ACCESS_GRANTED:
1182 		client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1183 		break;
1184 	default:
1185 		do_disconnect = 1;
1186 		log_debug("unexpected imsg %d", imsg.hdr.type);
1187 		break;
1188 	}
1189 
1190 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1191 		do_disconnect = 1;
1192 		log_debug("dropping imsg type %d from PID %d",
1193 		    imsg.hdr.type, client->auth->pid);
1194 	}
1195 	imsg_free(&imsg);
1196 
1197 	if (do_disconnect) {
1198 		if (err)
1199 			disconnect_on_error(client, err);
1200 		else
1201 			disconnect(client);
1202 		return;
1203 	}
1204 
1205 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1206 	if (repo == NULL) {
1207 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1208 		goto done;
1209 	}
1210 	kill_auth_proc(client);
1211 
1212 	log_info("authenticated uid %d for repository %s",
1213 	    client->euid, repo->name);
1214 
1215 	err = start_session_child(client, repo, gotd.argv0,
1216 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1217 	if (err)
1218 		goto done;
1219 done:
1220 	if (err)
1221 		log_warnx("uid %d: %s", client->euid, err->msg);
1222 
1223 	/* We might have killed the auth process by now. */
1224 	if (client->auth != NULL) {
1225 		if (!shut) {
1226 			gotd_imsg_event_add(iev);
1227 		} else {
1228 			/* This pipe is dead. Remove its event handler */
1229 			event_del(&iev->ev);
1230 		}
1231 	}
1232 }
1233 
1234 static const struct got_error *
1235 connect_session(struct gotd_client *client)
1236 {
1237 	const struct got_error *err = NULL;
1238 	struct gotd_imsg_connect iconnect;
1239 	int s;
1240 
1241 	memset(&iconnect, 0, sizeof(iconnect));
1242 
1243 	s = dup(client->fd);
1244 	if (s == -1)
1245 		return got_error_from_errno("dup");
1246 
1247 	iconnect.client_id = client->id;
1248 	iconnect.euid = client->euid;
1249 	iconnect.egid = client->egid;
1250 
1251 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1252 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1253 		err = got_error_from_errno("imsg compose CONNECT");
1254 		close(s);
1255 		return err;
1256 	}
1257 
1258 	/*
1259 	 * We are no longer interested in messages from this client.
1260 	 * Further client requests will be handled by the session process.
1261 	 */
1262 	msgbuf_clear(&client->iev.ibuf.w);
1263 	imsg_clear(&client->iev.ibuf);
1264 	event_del(&client->iev.ev);
1265 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1266 
1267 	return NULL;
1268 }
1269 
1270 static void
1271 gotd_dispatch_client_session(int fd, short event, void *arg)
1272 {
1273 	struct gotd_imsgev *iev = arg;
1274 	struct imsgbuf *ibuf = &iev->ibuf;
1275 	struct gotd_child_proc *proc = NULL;
1276 	struct gotd_client *client = NULL;
1277 	ssize_t n;
1278 	int shut = 0;
1279 	struct imsg imsg;
1280 
1281 	client = find_client_by_proc_fd(fd);
1282 	if (client == NULL) {
1283 		/* Can happen during process teardown. */
1284 		warnx("cannot find client for fd %d", fd);
1285 		shut = 1;
1286 		goto done;
1287 	}
1288 
1289 	if (event & EV_READ) {
1290 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1291 			fatal("imsg_read error");
1292 		if (n == 0) {
1293 			/* Connection closed. */
1294 			shut = 1;
1295 			goto done;
1296 		}
1297 	}
1298 
1299 	if (event & EV_WRITE) {
1300 		n = msgbuf_write(&ibuf->w);
1301 		if (n == -1 && errno != EAGAIN)
1302 			fatal("msgbuf_write");
1303 		if (n == 0) {
1304 			/* Connection closed. */
1305 			shut = 1;
1306 			goto done;
1307 		}
1308 	}
1309 
1310 	proc = client->session;
1311 	if (proc == NULL)
1312 		fatalx("cannot find session child process for fd %d", fd);
1313 
1314 	for (;;) {
1315 		const struct got_error *err = NULL;
1316 		uint32_t client_id = 0;
1317 		int do_disconnect = 0, do_start_repo_child = 0;
1318 
1319 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1320 			fatal("%s: imsg_get error", __func__);
1321 		if (n == 0)	/* No more messages. */
1322 			break;
1323 
1324 		switch (imsg.hdr.type) {
1325 		case GOTD_IMSG_ERROR:
1326 			do_disconnect = 1;
1327 			err = gotd_imsg_recv_error(&client_id, &imsg);
1328 			break;
1329 		case GOTD_IMSG_CLIENT_SESSION_READY:
1330 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1331 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1332 				break;
1333 			}
1334 			do_start_repo_child = 1;
1335 			break;
1336 		case GOTD_IMSG_DISCONNECT:
1337 			do_disconnect = 1;
1338 			break;
1339 		default:
1340 			log_debug("unexpected imsg %d", imsg.hdr.type);
1341 			break;
1342 		}
1343 
1344 		if (!verify_imsg_src(client, proc, &imsg)) {
1345 			log_debug("dropping imsg type %d from PID %d",
1346 			    imsg.hdr.type, proc->pid);
1347 			imsg_free(&imsg);
1348 			continue;
1349 		}
1350 		if (err)
1351 			log_warnx("uid %d: %s", client->euid, err->msg);
1352 
1353 		if (do_start_repo_child) {
1354 			struct gotd_repo *repo;
1355 			const char *name = client->session->repo_name;
1356 
1357 			repo = gotd_find_repo_by_name(name, &gotd);
1358 			if (repo != NULL) {
1359 				enum gotd_procid proc_type;
1360 
1361 				if (client->required_auth & GOTD_AUTH_WRITE)
1362 					proc_type = PROC_REPO_WRITE;
1363 				else
1364 					proc_type = PROC_REPO_READ;
1365 
1366 				err = start_repo_child(client, proc_type, repo,
1367 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1368 				    gotd.verbosity);
1369 			} else
1370 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1371 
1372 			if (err) {
1373 				log_warnx("uid %d: %s", client->euid, err->msg);
1374 				do_disconnect = 1;
1375 			}
1376 		}
1377 
1378 		if (do_disconnect) {
1379 			if (err)
1380 				disconnect_on_error(client, err);
1381 			else
1382 				disconnect(client);
1383 		}
1384 
1385 		imsg_free(&imsg);
1386 	}
1387 done:
1388 	if (!shut) {
1389 		gotd_imsg_event_add(iev);
1390 	} else {
1391 		/* This pipe is dead. Remove its event handler */
1392 		event_del(&iev->ev);
1393 		disconnect(client);
1394 	}
1395 }
1396 
1397 static void
1398 gotd_dispatch_repo_child(int fd, short event, void *arg)
1399 {
1400 	struct gotd_imsgev *iev = arg;
1401 	struct imsgbuf *ibuf = &iev->ibuf;
1402 	struct gotd_child_proc *proc = NULL;
1403 	struct gotd_client *client;
1404 	ssize_t n;
1405 	int shut = 0;
1406 	struct imsg imsg;
1407 
1408 	client = find_client_by_proc_fd(fd);
1409 	if (client == NULL) {
1410 		/* Can happen during process teardown. */
1411 		warnx("cannot find client for fd %d", fd);
1412 		shut = 1;
1413 		goto done;
1414 	}
1415 
1416 	if (event & EV_READ) {
1417 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1418 			fatal("imsg_read error");
1419 		if (n == 0) {
1420 			/* Connection closed. */
1421 			shut = 1;
1422 			goto done;
1423 		}
1424 	}
1425 
1426 	if (event & EV_WRITE) {
1427 		n = msgbuf_write(&ibuf->w);
1428 		if (n == -1 && errno != EAGAIN)
1429 			fatal("msgbuf_write");
1430 		if (n == 0) {
1431 			/* Connection closed. */
1432 			shut = 1;
1433 			goto done;
1434 		}
1435 	}
1436 
1437 	proc = client->repo;
1438 	if (proc == NULL)
1439 		fatalx("cannot find child process for fd %d", fd);
1440 
1441 	for (;;) {
1442 		const struct got_error *err = NULL;
1443 		uint32_t client_id = 0;
1444 		int do_disconnect = 0;
1445 
1446 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1447 			fatal("%s: imsg_get error", __func__);
1448 		if (n == 0)	/* No more messages. */
1449 			break;
1450 
1451 		switch (imsg.hdr.type) {
1452 		case GOTD_IMSG_ERROR:
1453 			do_disconnect = 1;
1454 			err = gotd_imsg_recv_error(&client_id, &imsg);
1455 			break;
1456 		case GOTD_IMSG_REPO_CHILD_READY:
1457 			err = connect_session(client);
1458 			if (err)
1459 				break;
1460 			err = connect_repo_child(client, proc);
1461 			break;
1462 		default:
1463 			log_debug("unexpected imsg %d", imsg.hdr.type);
1464 			break;
1465 		}
1466 
1467 		if (!verify_imsg_src(client, proc, &imsg)) {
1468 			log_debug("dropping imsg type %d from PID %d",
1469 			    imsg.hdr.type, proc->pid);
1470 			imsg_free(&imsg);
1471 			continue;
1472 		}
1473 		if (err)
1474 			log_warnx("uid %d: %s", client->euid, err->msg);
1475 
1476 		if (do_disconnect) {
1477 			if (err)
1478 				disconnect_on_error(client, err);
1479 			else
1480 				disconnect(client);
1481 		}
1482 
1483 		imsg_free(&imsg);
1484 	}
1485 done:
1486 	if (!shut) {
1487 		gotd_imsg_event_add(iev);
1488 	} else {
1489 		/* This pipe is dead. Remove its event handler */
1490 		event_del(&iev->ev);
1491 		disconnect(client);
1492 	}
1493 }
1494 
1495 static pid_t
1496 start_child(enum gotd_procid proc_id, const char *repo_path,
1497     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1498 {
1499 	char	*argv[11];
1500 	int	 argc = 0;
1501 	pid_t	 pid;
1502 
1503 	switch (pid = fork()) {
1504 	case -1:
1505 		fatal("cannot fork");
1506 	case 0:
1507 		break;
1508 	default:
1509 		close(fd);
1510 		return pid;
1511 	}
1512 
1513 	if (fd != GOTD_FILENO_MSG_PIPE) {
1514 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1515 			fatal("cannot setup imsg fd");
1516 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1517 		fatal("cannot setup imsg fd");
1518 
1519 	argv[argc++] = argv0;
1520 	switch (proc_id) {
1521 	case PROC_LISTEN:
1522 		argv[argc++] = (char *)"-L";
1523 		break;
1524 	case PROC_AUTH:
1525 		argv[argc++] = (char *)"-A";
1526 		break;
1527 	case PROC_SESSION_READ:
1528 		argv[argc++] = (char *)"-s";
1529 		break;
1530 	case PROC_SESSION_WRITE:
1531 		argv[argc++] = (char *)"-S";
1532 		break;
1533 	case PROC_REPO_READ:
1534 		argv[argc++] = (char *)"-R";
1535 		break;
1536 	case PROC_REPO_WRITE:
1537 		argv[argc++] = (char *)"-W";
1538 		break;
1539 	default:
1540 		fatalx("invalid process id %d", proc_id);
1541 	}
1542 
1543 	argv[argc++] = (char *)"-f";
1544 	argv[argc++] = (char *)confpath;
1545 
1546 	if (repo_path) {
1547 		argv[argc++] = (char *)"-P";
1548 		argv[argc++] = (char *)repo_path;
1549 	}
1550 
1551 	if (!daemonize)
1552 		argv[argc++] = (char *)"-d";
1553 	if (verbosity > 0)
1554 		argv[argc++] = (char *)"-v";
1555 	if (verbosity > 1)
1556 		argv[argc++] = (char *)"-v";
1557 	argv[argc++] = NULL;
1558 
1559 	execvp(argv0, argv);
1560 	fatal("execvp");
1561 }
1562 
1563 static void
1564 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1565 {
1566 	struct gotd_child_proc *proc;
1567 
1568 	proc = calloc(1, sizeof(*proc));
1569 	if (proc == NULL)
1570 		fatal("calloc");
1571 
1572 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1573 
1574 	/* proc->tmo is initialized in main() after event_init() */
1575 
1576 	proc->type = PROC_LISTEN;
1577 
1578 	if (socketpair(AF_UNIX, sock_flags,
1579 	    PF_UNSPEC, proc->pipe) == -1)
1580 		fatal("socketpair");
1581 
1582 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1583 	    proc->pipe[1], daemonize, verbosity);
1584 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1585 	proc->iev.handler = gotd_dispatch_listener;
1586 	proc->iev.events = EV_READ;
1587 	proc->iev.handler_arg = NULL;
1588 
1589 	gotd.listen_proc = proc;
1590 }
1591 
1592 static const struct got_error *
1593 start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1594     char *argv0, const char *confpath, int daemonize, int verbosity)
1595 {
1596 	struct gotd_child_proc *proc;
1597 	int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
1598 
1599 #ifdef SOCK_CLOEXEC
1600 	sock_flags |= SOCK_CLOEXEC;
1601 #endif
1602 
1603 	proc = calloc(1, sizeof(*proc));
1604 	if (proc == NULL)
1605 		return got_error_from_errno("calloc");
1606 
1607 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1608 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1609 
1610 	if (client_is_reading(client))
1611 		proc->type = PROC_SESSION_READ;
1612 	else
1613 		proc->type = PROC_SESSION_WRITE;
1614 	if (strlcpy(proc->repo_name, repo->name,
1615 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1616 		fatalx("repository name too long: %s", repo->name);
1617 	log_debug("starting client uid %d session for repository %s",
1618 	    client->euid, repo->name);
1619 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1620 	    sizeof(proc->repo_path))
1621 		fatalx("repository path too long: %s", repo->path);
1622 	if (socketpair(AF_UNIX, sock_flags, PF_UNSPEC, proc->pipe) == -1)
1623 		fatal("socketpair");
1624 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1625 	    confpath, proc->pipe[1], daemonize, verbosity);
1626 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1627 	log_debug("proc %s %s is on fd %d",
1628 	    gotd_proc_names[proc->type], proc->repo_path,
1629 	    proc->pipe[0]);
1630 	proc->iev.handler = gotd_dispatch_client_session;
1631 	proc->iev.events = EV_READ;
1632 	proc->iev.handler_arg = NULL;
1633 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1634 	    gotd_dispatch_client_session, &proc->iev);
1635 	gotd_imsg_event_add(&proc->iev);
1636 
1637 	client->session = proc;
1638 	return NULL;
1639 }
1640 
1641 static const struct got_error *
1642 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1643     struct gotd_repo *repo, char *argv0, const char *confpath,
1644     int daemonize, int verbosity)
1645 {
1646 	struct gotd_child_proc *proc;
1647 	int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1648 
1649 #ifdef SOCK_CLOEXEC
1650 	sock_flags |= SOCK_CLOEXEC;
1651 #endif
1652 
1653 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1654 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1655 
1656 	proc = calloc(1, sizeof(*proc));
1657 	if (proc == NULL)
1658 		return got_error_from_errno("calloc");
1659 
1660 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1661 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1662 
1663 	proc->type = proc_type;
1664 	if (strlcpy(proc->repo_name, repo->name,
1665 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1666 		fatalx("repository name too long: %s", repo->name);
1667 	log_debug("starting %s for repository %s",
1668 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1669 
1670 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1671 	    sizeof(proc->repo_path))
1672 		fatalx("repository path too long: %s", repo->path);
1673 	if (realpath(repo->path, proc->repo_path) == NULL)
1674 		fatal("%s", repo->path);
1675 	if (socketpair(AF_UNIX, sock_flags,
1676 	    PF_UNSPEC, proc->pipe) == -1)
1677 		fatal("socketpair");
1678 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1679 	    confpath, proc->pipe[1], daemonize, verbosity);
1680 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1681 	log_debug("proc %s %s is on fd %d",
1682 	    gotd_proc_names[proc->type], proc->repo_path,
1683 	    proc->pipe[0]);
1684 	proc->iev.handler = gotd_dispatch_repo_child;
1685 	proc->iev.events = EV_READ;
1686 	proc->iev.handler_arg = NULL;
1687 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1688 	    gotd_dispatch_repo_child, &proc->iev);
1689 	gotd_imsg_event_add(&proc->iev);
1690 
1691 	client->repo = proc;
1692 	return NULL;
1693 }
1694 
1695 static const struct got_error *
1696 start_auth_child(struct gotd_client *client, int required_auth,
1697     struct gotd_repo *repo, char *argv0, const char *confpath,
1698     int daemonize, int verbosity)
1699 {
1700 	const struct got_error *err = NULL;
1701 	struct gotd_child_proc *proc;
1702 	struct gotd_imsg_auth iauth;
1703 	int fd;
1704 	int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1705 
1706 #ifdef SOCK_CLOEXEC
1707 	sock_flags |= SOCK_CLOEXEC;
1708 #endif
1709 
1710 	memset(&iauth, 0, sizeof(iauth));
1711 
1712 	fd = dup(client->fd);
1713 	if (fd == -1)
1714 		return got_error_from_errno("dup");
1715 
1716 	proc = calloc(1, sizeof(*proc));
1717 	if (proc == NULL) {
1718 		err = got_error_from_errno("calloc");
1719 		close(fd);
1720 		return err;
1721 	}
1722 
1723 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1724 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1725 
1726 	proc->type = PROC_AUTH;
1727 	if (strlcpy(proc->repo_name, repo->name,
1728 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1729 		fatalx("repository name too long: %s", repo->name);
1730 	log_debug("starting auth for uid %d repository %s",
1731 	    client->euid, repo->name);
1732 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1733 	    sizeof(proc->repo_path))
1734 		fatalx("repository path too long: %s", repo->path);
1735 	if (realpath(repo->path, proc->repo_path) == NULL)
1736 		fatal("%s", repo->path);
1737 	if (socketpair(AF_UNIX, sock_flags,
1738 	    PF_UNSPEC, proc->pipe) == -1)
1739 		fatal("socketpair");
1740 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1741 	    confpath, proc->pipe[1], daemonize, verbosity);
1742 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1743 	log_debug("proc %s %s is on fd %d",
1744 	    gotd_proc_names[proc->type], proc->repo_path,
1745 	    proc->pipe[0]);
1746 	proc->iev.handler = gotd_dispatch_auth_child;
1747 	proc->iev.events = EV_READ;
1748 	proc->iev.handler_arg = NULL;
1749 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1750 	    gotd_dispatch_auth_child, &proc->iev);
1751 	gotd_imsg_event_add(&proc->iev);
1752 
1753 	iauth.euid = client->euid;
1754 	iauth.egid = client->egid;
1755 	iauth.required_auth = required_auth;
1756 	iauth.client_id = client->id;
1757 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1758 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1759 		log_warn("imsg compose AUTHENTICATE");
1760 		close(fd);
1761 		/* Let the auth_timeout handler tidy up. */
1762 	}
1763 
1764 	client->auth = proc;
1765 	client->required_auth = required_auth;
1766 	return NULL;
1767 }
1768 
1769 static void
1770 apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1771 {
1772 	if (need_tmpdir) {
1773 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1774 			fatal("unveil %s", GOT_TMPDIR_STR);
1775 	}
1776 
1777 	if (unveil(repo_path, "r") == -1)
1778 		fatal("unveil %s", repo_path);
1779 
1780 	if (unveil(NULL, NULL) == -1)
1781 		fatal("unveil");
1782 }
1783 
1784 static void
1785 apply_unveil_repo_readwrite(const char *repo_path)
1786 {
1787 	if (unveil(repo_path, "rwc") == -1)
1788 		fatal("unveil %s", repo_path);
1789 
1790 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1791 		fatal("unveil %s", GOT_TMPDIR_STR);
1792 
1793 	if (unveil(NULL, NULL) == -1)
1794 		fatal("unveil");
1795 }
1796 
1797 static void
1798 apply_unveil_none(void)
1799 {
1800 	if (unveil("/", "") == -1)
1801 		fatal("unveil");
1802 
1803 	if (unveil(NULL, NULL) == -1)
1804 		fatal("unveil");
1805 }
1806 
1807 static void
1808 apply_unveil_selfexec(void)
1809 {
1810 	if (unveil(gotd.argv0, "x") == -1)
1811 		fatal("unveil %s", gotd.argv0);
1812 
1813 	if (unveil(NULL, NULL) == -1)
1814 		fatal("unveil");
1815 }
1816 
1817 int
1818 main(int argc, char **argv)
1819 {
1820 	const struct got_error *error = NULL;
1821 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1822 	const char *confpath = GOTD_CONF_PATH;
1823 	char *argv0 = argv[0];
1824 	char title[2048];
1825 	struct passwd *pw = NULL;
1826 	char *repo_path = NULL;
1827 	enum gotd_procid proc_id = PROC_GOTD;
1828 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1829 	int *pack_fds = NULL, *temp_fds = NULL;
1830 	struct gotd_repo *repo = NULL;
1831 
1832 	TAILQ_INIT(&procs);
1833 
1834 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1835 
1836 	while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1837 		switch (ch) {
1838 		case 'A':
1839 			proc_id = PROC_AUTH;
1840 			break;
1841 		case 'd':
1842 			daemonize = 0;
1843 			break;
1844 		case 'f':
1845 			confpath = optarg;
1846 			break;
1847 		case 'L':
1848 			proc_id = PROC_LISTEN;
1849 			break;
1850 		case 'n':
1851 			noaction = 1;
1852 			break;
1853 		case 'P':
1854 			repo_path = realpath(optarg, NULL);
1855 			if (repo_path == NULL)
1856 				fatal("realpath '%s'", optarg);
1857 			break;
1858 		case 'R':
1859 			proc_id = PROC_REPO_READ;
1860 			break;
1861 		case 's':
1862 			proc_id = PROC_SESSION_READ;
1863 			break;
1864 		case 'S':
1865 			proc_id = PROC_SESSION_WRITE;
1866 			break;
1867 		case 'v':
1868 			if (verbosity < 3)
1869 				verbosity++;
1870 			break;
1871 		case 'W':
1872 			proc_id = PROC_REPO_WRITE;
1873 			break;
1874 		default:
1875 			usage();
1876 		}
1877 	}
1878 
1879 	argc -= optind;
1880 	argv += optind;
1881 
1882 	if (argc != 0)
1883 		usage();
1884 
1885 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1886 		fatalx("need root privileges");
1887 
1888 	if (parse_config(confpath, proc_id, &gotd) != 0)
1889 		return 1;
1890 
1891 	pw = getpwnam(gotd.user_name);
1892 	if (pw == NULL)
1893 		fatalx("user %s not found", gotd.user_name);
1894 
1895 	if (pw->pw_uid == 0)
1896 		fatalx("cannot run %s as the superuser", getprogname());
1897 
1898 	if (noaction) {
1899 		fprintf(stderr, "configuration OK\n");
1900 		return 0;
1901 	}
1902 
1903 	gotd.argv0 = argv0;
1904 	gotd.daemonize = daemonize;
1905 	gotd.verbosity = verbosity;
1906 	gotd.confpath = confpath;
1907 
1908 	/* Require an absolute path in argv[0] for reliable re-exec. */
1909 	if (!got_path_is_absolute(argv0))
1910 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1911 
1912 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1913 	log_setverbose(verbosity);
1914 
1915 	if (proc_id == PROC_GOTD) {
1916 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1917 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1918 		if (daemonize && daemon(1, 0) == -1)
1919 			fatal("daemon");
1920 		gotd.pid = getpid();
1921 		start_listener(argv0, confpath, daemonize, verbosity);
1922 	} else if (proc_id == PROC_LISTEN) {
1923 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1924 		if (verbosity) {
1925 			log_info("socket: %s", gotd.unix_socket_path);
1926 			log_info("user: %s", pw->pw_name);
1927 		}
1928 
1929 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1930 		    pw->pw_gid);
1931 		if (fd == -1) {
1932 			fatal("cannot listen on unix socket %s",
1933 			    gotd.unix_socket_path);
1934 		}
1935 	} else if (proc_id == PROC_AUTH) {
1936 		snprintf(title, sizeof(title), "%s %s",
1937 		    gotd_proc_names[proc_id], repo_path);
1938 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1939 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1940 		error = got_repo_pack_fds_open(&pack_fds);
1941 		if (error != NULL)
1942 			fatalx("cannot open pack tempfiles: %s", error->msg);
1943 		error = got_repo_temp_fds_open(&temp_fds);
1944 		if (error != NULL)
1945 			fatalx("cannot open pack tempfiles: %s", error->msg);
1946 		if (repo_path == NULL)
1947 			fatalx("repository path not specified");
1948 		snprintf(title, sizeof(title), "%s %s",
1949 		    gotd_proc_names[proc_id], repo_path);
1950 	} else
1951 		fatal("invalid process id %d", proc_id);
1952 
1953 	setproctitle("%s", title);
1954 	log_procinit(title);
1955 
1956 	/* Drop root privileges. */
1957 	if (setgid(pw->pw_gid) == -1)
1958 		fatal("setgid %d failed", pw->pw_gid);
1959 	if (setuid(pw->pw_uid) == -1)
1960 		fatal("setuid %d failed", pw->pw_uid);
1961 
1962 	event_init();
1963 
1964 	switch (proc_id) {
1965 	case PROC_GOTD:
1966 #ifndef PROFILE
1967 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1968 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1969 			err(1, "pledge");
1970 #endif
1971 		break;
1972 	case PROC_LISTEN:
1973 #ifndef PROFILE
1974 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1975 			err(1, "pledge");
1976 #endif
1977 		/*
1978 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1979 		 * sockets by revoking all filesystem access via unveil(2).
1980 		 */
1981 		apply_unveil_none();
1982 
1983 		listen_main(title, fd, gotd.connection_limits,
1984 		    gotd.nconnection_limits);
1985 		/* NOTREACHED */
1986 		break;
1987 	case PROC_AUTH:
1988 #ifndef PROFILE
1989 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1990 			err(1, "pledge");
1991 #endif
1992 		/*
1993 		 * We need the "unix" pledge promise for getpeername(2) only.
1994 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
1995 		 * filesystem access via unveil(2). Access to password database
1996 		 * files will still work since "getpw" bypasses unveil(2).
1997 		 */
1998 		apply_unveil_none();
1999 
2000 		auth_main(title, &gotd.repos, repo_path);
2001 		/* NOTREACHED */
2002 		break;
2003 	case PROC_SESSION_READ:
2004 	case PROC_SESSION_WRITE:
2005 #ifndef PROFILE
2006 		/*
2007 		 * The "recvfd" promise is only needed during setup and
2008 		 * will be removed in a later pledge(2) call.
2009 		 */
2010 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
2011 		    "unveil", NULL) == -1)
2012 			err(1, "pledge");
2013 #endif
2014 		if (proc_id == PROC_SESSION_READ)
2015 			apply_unveil_repo_readonly(repo_path, 1);
2016 		else
2017 			apply_unveil_repo_readwrite(repo_path);
2018 		session_main(title, repo_path, pack_fds, temp_fds,
2019 		    &gotd.request_timeout, proc_id);
2020 		/* NOTREACHED */
2021 		break;
2022 	case PROC_REPO_READ:
2023 #ifndef PROFILE
2024 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2025 			err(1, "pledge");
2026 #endif
2027 		apply_unveil_repo_readonly(repo_path, 0);
2028 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2029 		/* NOTREACHED */
2030 		exit(0);
2031 	case PROC_REPO_WRITE:
2032 #ifndef PROFILE
2033 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2034 			err(1, "pledge");
2035 #endif
2036 		apply_unveil_repo_readonly(repo_path, 0);
2037 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2038 		if (repo == NULL)
2039 			fatalx("no repository for path %s", repo_path);
2040 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2041 		    &repo->protected_tag_namespaces,
2042 		    &repo->protected_branch_namespaces,
2043 		    &repo->protected_branches);
2044 		/* NOTREACHED */
2045 		exit(0);
2046 	default:
2047 		fatal("invalid process id %d", proc_id);
2048 	}
2049 
2050 	if (proc_id != PROC_GOTD)
2051 		fatal("invalid process id %d", proc_id);
2052 
2053 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2054 	    gotd.listen_proc);
2055 
2056 	apply_unveil_selfexec();
2057 
2058 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2059 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2060 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2061 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2062 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2063 	signal(SIGPIPE, SIG_IGN);
2064 
2065 	signal_add(&evsigint, NULL);
2066 	signal_add(&evsigterm, NULL);
2067 	signal_add(&evsighup, NULL);
2068 	signal_add(&evsigusr1, NULL);
2069 	signal_add(&evsigchld, NULL);
2070 
2071 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2072 
2073 	event_dispatch();
2074 
2075 	free(repo_path);
2076 	gotd_shutdown();
2077 
2078 	return 0;
2079 }