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Date:: Wed Aug 23 11:28:31 2023 UTC
Message:: portable: gotd/gitwrapper: update for libs Bring gotd and gitwrapper closer to how libraries are detected.
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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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/time.h>
21 #include <sys/types.h>
22 #include <sys/stat.h>
23 #include <sys/socket.h>
24 #include <sys/un.h>
25 #include <sys/wait.h>
26 
27 #include <fcntl.h>
28 #include <err.h>
29 #include <errno.h>
30 #include <event.h>
31 #include <limits.h>
32 #include <pwd.h>
33 #include <imsg.h>
34 #include <signal.h>
35 #include <stdarg.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <syslog.h>
40 #include <unistd.h>
41 
42 #include "got_error.h"
43 #include "got_opentemp.h"
44 #include "got_path.h"
45 #include "got_repository.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 
49 #include "got_lib_delta.h"
50 #include "got_lib_object.h"
51 #include "got_lib_object_cache.h"
52 #include "got_lib_hash.h"
53 #include "got_lib_gitproto.h"
54 #include "got_lib_pack.h"
55 #include "got_lib_repository.h"
56 
57 #include "gotd.h"
58 #include "log.h"
59 #include "listen.h"
60 #include "auth.h"
61 #include "session.h"
62 #include "repo_read.h"
63 #include "repo_write.h"
64 
65 #ifndef nitems
66 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
67 #endif
68 
69 enum gotd_client_state {
70 	GOTD_CLIENT_STATE_NEW,
71 	GOTD_CLIENT_STATE_ACCESS_GRANTED,
72 };
73 
74 struct gotd_child_proc {
75 	pid_t				 pid;
76 	enum gotd_procid		 type;
77 	char				 repo_name[NAME_MAX];
78 	char				 repo_path[PATH_MAX];
79 	int				 pipe[2];
80 	struct gotd_imsgev		 iev;
81 	struct event			 tmo;
82 
83 	TAILQ_ENTRY(gotd_child_proc)	 entry;
84 };
85 TAILQ_HEAD(gotd_procs, gotd_child_proc) procs;
86 
87 struct gotd_client {
88 	STAILQ_ENTRY(gotd_client)	 entry;
89 	enum gotd_client_state		 state;
90 	uint32_t			 id;
91 	int				 fd;
92 	struct gotd_imsgev		 iev;
93 	struct event			 tmo;
94 	uid_t				 euid;
95 	gid_t				 egid;
96 	struct gotd_child_proc		*repo;
97 	struct gotd_child_proc		*auth;
98 	struct gotd_child_proc		*session;
99 	int				 required_auth;
100 };
101 STAILQ_HEAD(gotd_clients, gotd_client);
102 
103 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
104 static SIPHASH_KEY clients_hash_key;
105 volatile int client_cnt;
106 static struct timeval auth_timeout = { 5, 0 };
107 static struct gotd gotd;
108 
109 void gotd_sighdlr(int sig, short event, void *arg);
110 static void gotd_shutdown(void);
111 static const struct got_error *start_session_child(struct gotd_client *,
112     struct gotd_repo *, char *, const char *, int, int);
113 static const struct got_error *start_repo_child(struct gotd_client *,
114     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
115 static const struct got_error *start_auth_child(struct gotd_client *, int,
116     struct gotd_repo *, char *, const char *, int, int);
117 static void kill_proc(struct gotd_child_proc *, int);
118 static void disconnect(struct gotd_client *);
119 
120 __dead static void
121 usage(void)
122 {
123 	fprintf(stderr, "usage: %s [-dnv] [-f config-file]\n", getprogname());
124 	exit(1);
125 }
126 
127 static int
128 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
129 {
130 	struct sockaddr_un sun;
131 	int fd = -1;
132 	mode_t old_umask, mode;
133 	int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
134 
135 #ifdef SOCK_CLOEXEC
136 	sock_flags |= SOCK_CLOEXEC;
137 #endif
138 
139 	fd = socket(AF_UNIX, sock_flags, 0);
140 	if (fd == -1) {
141 		log_warn("socket");
142 		return -1;
143 	}
144 
145 	sun.sun_family = AF_UNIX;
146 	if (strlcpy(sun.sun_path, unix_socket_path,
147 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
148 		log_warnx("%s: name too long", unix_socket_path);
149 		close(fd);
150 		return -1;
151 	}
152 
153 	if (unlink(unix_socket_path) == -1) {
154 		if (errno != ENOENT) {
155 			log_warn("unlink %s", unix_socket_path);
156 			close(fd);
157 			return -1;
158 		}
159 	}
160 
161 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
162 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
163 
164 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
165 		log_warn("bind: %s", unix_socket_path);
166 		close(fd);
167 		umask(old_umask);
168 		return -1;
169 	}
170 
171 	umask(old_umask);
172 
173 	if (chmod(unix_socket_path, mode) == -1) {
174 		log_warn("chmod %o %s", mode, unix_socket_path);
175 		close(fd);
176 		unlink(unix_socket_path);
177 		return -1;
178 	}
179 
180 	if (chown(unix_socket_path, uid, gid) == -1) {
181 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
182 		close(fd);
183 		unlink(unix_socket_path);
184 		return -1;
185 	}
186 
187 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
188 		log_warn("listen");
189 		close(fd);
190 		unlink(unix_socket_path);
191 		return -1;
192 	}
193 
194 	return fd;
195 }
196 
197 static uint64_t
198 client_hash(uint32_t client_id)
199 {
200 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
201 }
202 
203 static void
204 add_client(struct gotd_client *client)
205 {
206 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
207 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
208 	client_cnt++;
209 }
210 
211 static struct gotd_client *
212 find_client(uint32_t client_id)
213 {
214 	uint64_t slot;
215 	struct gotd_client *c;
216 
217 	slot = client_hash(client_id) % nitems(gotd_clients);
218 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
219 		if (c->id == client_id)
220 			return c;
221 	}
222 
223 	return NULL;
224 }
225 
226 static struct gotd_client *
227 find_client_by_proc_fd(int fd)
228 {
229 	uint64_t slot;
230 
231 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
232 		struct gotd_client *c;
233 
234 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
235 			if (c->repo && c->repo->iev.ibuf.fd == fd)
236 				return c;
237 			if (c->auth && c->auth->iev.ibuf.fd == fd)
238 				return c;
239 			if (c->session && c->session->iev.ibuf.fd == fd)
240 				return c;
241 		}
242 	}
243 
244 	return NULL;
245 }
246 
247 static int
248 client_is_reading(struct gotd_client *client)
249 {
250 	return (client->required_auth &
251 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) == GOTD_AUTH_READ;
252 }
253 
254 static int
255 client_is_writing(struct gotd_client *client)
256 {
257 	return (client->required_auth &
258 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE)) ==
259 	    (GOTD_AUTH_READ | GOTD_AUTH_WRITE);
260 }
261 
262 static const struct got_error *
263 ensure_client_is_not_writing(struct gotd_client *client)
264 {
265 	if (client_is_writing(client)) {
266 		return got_error_fmt(GOT_ERR_BAD_PACKET,
267 		    "uid %d made a read-request but is writing to "
268 		    "a repository", client->euid);
269 	}
270 
271 	return NULL;
272 }
273 
274 static const struct got_error *
275 ensure_client_is_not_reading(struct gotd_client *client)
276 {
277 	if (client_is_reading(client)) {
278 		return got_error_fmt(GOT_ERR_BAD_PACKET,
279 		    "uid %d made a write-request but is reading from "
280 		    "a repository", client->euid);
281 	}
282 
283 	return NULL;
284 }
285 
286 static void
287 proc_done(struct gotd_child_proc *proc)
288 {
289 	struct gotd_client *client;
290 
291 	TAILQ_REMOVE(&procs, proc, entry);
292 
293 	client = find_client_by_proc_fd(proc->iev.ibuf.fd);
294 	if (client != NULL) {
295 		if (proc == client->repo)
296 			client->repo = NULL;
297 		if (proc == client->auth)
298 			client->auth = NULL;
299 		if (proc == client->session)
300 			client->session = NULL;
301 		disconnect(client);
302 	}
303 
304 	evtimer_del(&proc->tmo);
305 
306 	if (proc->iev.ibuf.fd != -1) {
307 		event_del(&proc->iev.ev);
308 		msgbuf_clear(&proc->iev.ibuf.w);
309 		close(proc->iev.ibuf.fd);
310 	}
311 
312 	free(proc);
313 }
314 
315 static void
316 kill_repo_proc(struct gotd_client *client)
317 {
318 	if (client->repo == NULL)
319 		return;
320 
321 	kill_proc(client->repo, 0);
322 	client->repo = NULL;
323 }
324 
325 static void
326 kill_auth_proc(struct gotd_client *client)
327 {
328 	if (client->auth == NULL)
329 		return;
330 
331 	kill_proc(client->auth, 0);
332 	client->auth = NULL;
333 }
334 
335 static void
336 kill_session_proc(struct gotd_client *client)
337 {
338 	if (client->session == NULL)
339 		return;
340 
341 	kill_proc(client->session, 0);
342 	client->session = NULL;
343 }
344 
345 static void
346 disconnect(struct gotd_client *client)
347 {
348 	struct gotd_imsg_disconnect idisconnect;
349 	struct gotd_child_proc *listen_proc = gotd.listen_proc;
350 	uint64_t slot;
351 
352 	log_debug("uid %d: disconnecting", client->euid);
353 
354 	kill_auth_proc(client);
355 	kill_session_proc(client);
356 	kill_repo_proc(client);
357 
358 	idisconnect.client_id = client->id;
359 	if (gotd_imsg_compose_event(&listen_proc->iev,
360 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
361 	    &idisconnect, sizeof(idisconnect)) == -1)
362 		log_warn("imsg compose DISCONNECT");
363 
364 	slot = client_hash(client->id) % nitems(gotd_clients);
365 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
366 	imsg_clear(&client->iev.ibuf);
367 	event_del(&client->iev.ev);
368 	evtimer_del(&client->tmo);
369 	if (client->fd != -1)
370 		close(client->fd);
371 	else if (client->iev.ibuf.fd != -1)
372 		close(client->iev.ibuf.fd);
373 	free(client);
374 	client_cnt--;
375 }
376 
377 static void
378 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
379 {
380 	struct imsgbuf ibuf;
381 
382 	if (err->code != GOT_ERR_EOF) {
383 		log_warnx("uid %d: %s", client->euid, err->msg);
384 		if (client->fd != -1) {
385 			imsg_init(&ibuf, client->fd);
386 			gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
387 			imsg_clear(&ibuf);
388 		}
389 	}
390 	disconnect(client);
391 }
392 
393 static const struct got_error *
394 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
395 {
396 	const struct got_error *err = NULL;
397 	struct gotd_imsg_info_repo irepo;
398 
399 	memset(&irepo, 0, sizeof(irepo));
400 
401 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
402 	    >= sizeof(irepo.repo_name))
403 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
404 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
405 	    >= sizeof(irepo.repo_path))
406 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
407 
408 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
409 	    &irepo, sizeof(irepo)) == -1) {
410 		err = got_error_from_errno("imsg compose INFO_REPO");
411 		if (err)
412 			return err;
413 	}
414 
415 	return NULL;
416 }
417 
418 static const struct got_error *
419 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
420 {
421 	const struct got_error *err = NULL;
422 	struct gotd_imsg_info_client iclient;
423 	struct gotd_child_proc *proc;
424 
425 	memset(&iclient, 0, sizeof(iclient));
426 	iclient.euid = client->euid;
427 	iclient.egid = client->egid;
428 
429 	proc = client->repo;
430 	if (proc) {
431 		if (strlcpy(iclient.repo_name, proc->repo_path,
432 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
433 			return got_error_msg(GOT_ERR_NO_SPACE,
434 			    "repo name too long");
435 		}
436 		if (client_is_writing(client))
437 			iclient.is_writing = 1;
438 
439 		iclient.repo_child_pid = proc->pid;
440 	}
441 
442 	if (client->session)
443 		iclient.session_child_pid = client->session->pid;
444 
445 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
446 	    &iclient, sizeof(iclient)) == -1) {
447 		err = got_error_from_errno("imsg compose INFO_CLIENT");
448 		if (err)
449 			return err;
450 	}
451 
452 	return NULL;
453 }
454 
455 static const struct got_error *
456 send_info(struct gotd_client *client)
457 {
458 	const struct got_error *err = NULL;
459 	struct gotd_imsg_info info;
460 	uint64_t slot;
461 	struct gotd_repo *repo;
462 
463 	if (client->euid != 0)
464 		return got_error_set_errno(EPERM, "info");
465 
466 	info.pid = gotd.pid;
467 	info.verbosity = gotd.verbosity;
468 	info.nrepos = gotd.nrepos;
469 	info.nclients = client_cnt - 1;
470 
471 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
472 	    &info, sizeof(info)) == -1) {
473 		err = got_error_from_errno("imsg compose INFO");
474 		if (err)
475 			return err;
476 	}
477 
478 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
479 		err = send_repo_info(&client->iev, repo);
480 		if (err)
481 			return err;
482 	}
483 
484 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
485 		struct gotd_client *c;
486 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
487 			if (c->id == client->id)
488 				continue;
489 			err = send_client_info(&client->iev, c);
490 			if (err)
491 				return err;
492 		}
493 	}
494 
495 	return NULL;
496 }
497 
498 static const struct got_error *
499 stop_gotd(struct gotd_client *client)
500 {
501 
502 	if (client->euid != 0)
503 		return got_error_set_errno(EPERM, "stop");
504 
505 	gotd_shutdown();
506 	/* NOTREACHED */
507 	return NULL;
508 }
509 
510 static const struct got_error *
511 start_client_authentication(struct gotd_client *client, struct imsg *imsg)
512 {
513 	const struct got_error *err;
514 	struct gotd_imsg_list_refs ireq;
515 	struct gotd_repo *repo = NULL;
516 	size_t datalen;
517 
518 	log_debug("list-refs request from uid %d", client->euid);
519 
520 	if (client->state != GOTD_CLIENT_STATE_NEW)
521 		return got_error_msg(GOT_ERR_BAD_REQUEST,
522 		    "unexpected list-refs request received");
523 
524 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
525 	if (datalen != sizeof(ireq))
526 		return got_error(GOT_ERR_PRIVSEP_LEN);
527 
528 	memcpy(&ireq, imsg->data, datalen);
529 
530 	if (ireq.client_is_reading) {
531 		err = ensure_client_is_not_writing(client);
532 		if (err)
533 			return err;
534 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
535 		if (repo == NULL)
536 			return got_error(GOT_ERR_NOT_GIT_REPO);
537 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
538 		    gotd.argv0, gotd.confpath, gotd.daemonize,
539 		    gotd.verbosity);
540 		if (err)
541 			return err;
542 	} else {
543 		err = ensure_client_is_not_reading(client);
544 		if (err)
545 			return err;
546 		repo = gotd_find_repo_by_name(ireq.repo_name, &gotd);
547 		if (repo == NULL)
548 			return got_error(GOT_ERR_NOT_GIT_REPO);
549 		err = start_auth_child(client,
550 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
551 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
552 		    gotd.verbosity);
553 		if (err)
554 			return err;
555 	}
556 
557 	evtimer_add(&client->tmo, &auth_timeout);
558 
559 	/* Flow continues upon authentication success/failure or timeout. */
560 	return NULL;
561 }
562 
563 static void
564 gotd_request(int fd, short events, void *arg)
565 {
566 	struct gotd_imsgev *iev = arg;
567 	struct imsgbuf *ibuf = &iev->ibuf;
568 	struct gotd_client *client = iev->handler_arg;
569 	const struct got_error *err = NULL;
570 	struct imsg imsg;
571 	ssize_t n;
572 
573 	if (events & EV_WRITE) {
574 		while (ibuf->w.queued) {
575 			n = msgbuf_write(&ibuf->w);
576 			if (n == -1 && errno == EPIPE) {
577 				/*
578 				 * The client has closed its socket.
579 				 * This can happen when Git clients are
580 				 * done sending pack file data.
581 				 */
582 				msgbuf_clear(&ibuf->w);
583 				continue;
584 			} else if (n == -1 && errno != EAGAIN) {
585 				err = got_error_from_errno("imsg_flush");
586 				disconnect_on_error(client, err);
587 				return;
588 			}
589 			if (n == 0) {
590 				/* Connection closed. */
591 				err = got_error(GOT_ERR_EOF);
592 				disconnect_on_error(client, err);
593 				return;
594 			}
595 		}
596 
597 		/* Disconnect gotctl(8) now that messages have been sent. */
598 		if (!client_is_reading(client) && !client_is_writing(client)) {
599 			disconnect(client);
600 			return;
601 		}
602 	}
603 
604 	if ((events & EV_READ) == 0)
605 		return;
606 
607 	memset(&imsg, 0, sizeof(imsg));
608 
609 	while (err == NULL) {
610 		err = gotd_imsg_recv(&imsg, ibuf, 0);
611 		if (err) {
612 			if (err->code == GOT_ERR_PRIVSEP_READ)
613 				err = NULL;
614 			break;
615 		}
616 
617 		evtimer_del(&client->tmo);
618 
619 		switch (imsg.hdr.type) {
620 		case GOTD_IMSG_INFO:
621 			err = send_info(client);
622 			break;
623 		case GOTD_IMSG_STOP:
624 			err = stop_gotd(client);
625 			break;
626 		case GOTD_IMSG_LIST_REFS:
627 			err = start_client_authentication(client, &imsg);
628 			break;
629 		default:
630 			log_debug("unexpected imsg %d", imsg.hdr.type);
631 			err = got_error(GOT_ERR_PRIVSEP_MSG);
632 			break;
633 		}
634 
635 		imsg_free(&imsg);
636 	}
637 
638 	if (err) {
639 		disconnect_on_error(client, err);
640 	} else {
641 		gotd_imsg_event_add(&client->iev);
642 	}
643 }
644 
645 static void
646 gotd_auth_timeout(int fd, short events, void *arg)
647 {
648 	struct gotd_client *client = arg;
649 
650 	log_debug("disconnecting uid %d due to authentication timeout",
651 	    client->euid);
652 	disconnect(client);
653 }
654 
655 static const struct got_error *
656 recv_connect(uint32_t *client_id, struct imsg *imsg)
657 {
658 	const struct got_error *err = NULL;
659 	struct gotd_imsg_connect iconnect;
660 	size_t datalen;
661 	int s = -1;
662 	struct gotd_client *client = NULL;
663 
664 	*client_id = 0;
665 
666 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
667 	if (datalen != sizeof(iconnect))
668 		return got_error(GOT_ERR_PRIVSEP_LEN);
669 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
670 
671 	s = imsg->fd;
672 	if (s == -1) {
673 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
674 		goto done;
675 	}
676 
677 	if (find_client(iconnect.client_id)) {
678 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
679 		goto done;
680 	}
681 
682 	client = calloc(1, sizeof(*client));
683 	if (client == NULL) {
684 		err = got_error_from_errno("calloc");
685 		goto done;
686 	}
687 
688 	*client_id = iconnect.client_id;
689 
690 	client->state = GOTD_CLIENT_STATE_NEW;
691 	client->id = iconnect.client_id;
692 	client->fd = s;
693 	s = -1;
694 	/* The auth process will verify UID/GID for us. */
695 	client->euid = iconnect.euid;
696 	client->egid = iconnect.egid;
697 
698 	imsg_init(&client->iev.ibuf, client->fd);
699 	client->iev.handler = gotd_request;
700 	client->iev.events = EV_READ;
701 	client->iev.handler_arg = client;
702 
703 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
704 	    &client->iev);
705 	gotd_imsg_event_add(&client->iev);
706 
707 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
708 
709 	add_client(client);
710 	log_debug("%s: new client uid %d connected on fd %d", __func__,
711 	    client->euid, client->fd);
712 done:
713 	if (err) {
714 		struct gotd_child_proc *listen_proc = gotd.listen_proc;
715 		struct gotd_imsg_disconnect idisconnect;
716 
717 		idisconnect.client_id = client->id;
718 		if (gotd_imsg_compose_event(&listen_proc->iev,
719 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
720 		    &idisconnect, sizeof(idisconnect)) == -1)
721 			log_warn("imsg compose DISCONNECT");
722 
723 		if (s != -1)
724 			close(s);
725 	}
726 
727 	return err;
728 }
729 
730 static const char *gotd_proc_names[PROC_MAX] = {
731 	"parent",
732 	"listen",
733 	"auth",
734 	"session_read",
735 	"session_write",
736 	"repo_read",
737 	"repo_write",
738 	"gitwrapper"
739 };
740 
741 static void
742 kill_proc(struct gotd_child_proc *proc, int fatal)
743 {
744 	struct timeval tv = { 5, 0 };
745 
746 	log_debug("kill -%d %d", fatal ? SIGKILL : SIGTERM, proc->pid);
747 
748 	if (proc->iev.ibuf.fd != -1) {
749 		event_del(&proc->iev.ev);
750 		msgbuf_clear(&proc->iev.ibuf.w);
751 		close(proc->iev.ibuf.fd);
752 		proc->iev.ibuf.fd = -1;
753 	}
754 
755 	if (!evtimer_pending(&proc->tmo, NULL) && !fatal)
756 		evtimer_add(&proc->tmo, &tv);
757 
758 	if (fatal) {
759 		log_warnx("sending SIGKILL to PID %d", proc->pid);
760 		kill(proc->pid, SIGKILL);
761 	} else
762 		kill(proc->pid, SIGTERM);
763 }
764 
765 static void
766 kill_proc_timeout(int fd, short ev, void *d)
767 {
768 	struct gotd_child_proc *proc = d;
769 
770 	log_warnx("timeout waiting for PID %d to terminate;"
771 	    " retrying with force", proc->pid);
772 	kill_proc(proc, 1);
773 }
774 
775 static void
776 gotd_shutdown(void)
777 {
778 	uint64_t slot;
779 
780 	log_debug("shutting down");
781 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
782 		struct gotd_client *c, *tmp;
783 
784 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
785 			disconnect(c);
786 	}
787 
788 	kill_proc(gotd.listen_proc, 0);
789 
790 	log_info("terminating");
791 	exit(0);
792 }
793 
794 static struct gotd_child_proc *
795 find_proc_by_pid(pid_t pid)
796 {
797 	struct gotd_child_proc *proc = NULL;
798 
799 	TAILQ_FOREACH(proc, &procs, entry)
800 		if (proc->pid == pid)
801 			break;
802 
803 	return proc;
804 }
805 
806 void
807 gotd_sighdlr(int sig, short event, void *arg)
808 {
809 	struct gotd_child_proc *proc;
810 	pid_t pid;
811 	int status;
812 
813 	/*
814 	 * Normal signal handler rules don't apply because libevent
815 	 * decouples for us.
816 	 */
817 
818 	switch (sig) {
819 	case SIGHUP:
820 		log_info("%s: ignoring SIGHUP", __func__);
821 		break;
822 	case SIGUSR1:
823 		log_info("%s: ignoring SIGUSR1", __func__);
824 		break;
825 	case SIGTERM:
826 	case SIGINT:
827 		gotd_shutdown();
828 		break;
829 	case SIGCHLD:
830 		for (;;) {
831 			pid = waitpid(WAIT_ANY, &status, WNOHANG);
832 			if (pid == -1) {
833 				if (errno == EINTR)
834 					continue;
835 				if (errno == ECHILD)
836 					break;
837 				fatal("waitpid");
838 			}
839 			if (pid == 0)
840 				break;
841 
842 			log_debug("reaped pid %d", pid);
843 			proc = find_proc_by_pid(pid);
844 			if (proc == NULL) {
845 				log_info("caught exit of unknown child %d",
846 				    pid);
847 				continue;
848 			}
849 
850 			if (WIFSIGNALED(status)) {
851 				log_warnx("child PID %d terminated with"
852 				    " signal %d", pid, WTERMSIG(status));
853 			}
854 
855 			proc_done(proc);
856 		}
857 		break;
858 	default:
859 		fatalx("unexpected signal");
860 	}
861 }
862 
863 static const struct got_error *
864 ensure_proc_is_reading(struct gotd_client *client,
865     struct gotd_child_proc *proc)
866 {
867 	if (!client_is_reading(client)) {
868 		kill_proc(proc, 1);
869 		return got_error_fmt(GOT_ERR_BAD_PACKET,
870 		    "PID %d handled a read-request for uid %d but this "
871 		    "user is not reading from a repository", proc->pid,
872 		    client->euid);
873 	}
874 
875 	return NULL;
876 }
877 
878 static const struct got_error *
879 ensure_proc_is_writing(struct gotd_client *client,
880     struct gotd_child_proc *proc)
881 {
882 	if (!client_is_writing(client)) {
883 		kill_proc(proc, 1);
884 		return got_error_fmt(GOT_ERR_BAD_PACKET,
885 		    "PID %d handled a write-request for uid %d but this "
886 		    "user is not writing to a repository", proc->pid,
887 		    client->euid);
888 	}
889 
890 	return NULL;
891 }
892 
893 static int
894 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
895     struct imsg *imsg)
896 {
897 	const struct got_error *err;
898 	int ret = 0;
899 
900 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
901 		if (client->repo == NULL)
902 			fatalx("no process found for uid %d", client->euid);
903 		if (proc->pid != client->repo->pid) {
904 			kill_proc(proc, 1);
905 			log_warnx("received message from PID %d for uid %d, "
906 			    "while PID %d is the process serving this user",
907 			    proc->pid, client->euid, client->repo->pid);
908 			return 0;
909 		}
910 	}
911 	if (proc->type == PROC_SESSION_READ ||
912 	    proc->type == PROC_SESSION_WRITE) {
913 		if (client->session == NULL) {
914 			log_warnx("no session found for uid %d", client->euid);
915 			return 0;
916 		}
917 		if (proc->pid != client->session->pid) {
918 			kill_proc(proc, 1);
919 			log_warnx("received message from PID %d for uid %d, "
920 			    "while PID %d is the process serving this user",
921 			    proc->pid, client->euid, client->session->pid);
922 			return 0;
923 		}
924 	}
925 
926 	switch (imsg->hdr.type) {
927 	case GOTD_IMSG_ERROR:
928 		ret = 1;
929 		break;
930 	case GOTD_IMSG_CONNECT:
931 		if (proc->type != PROC_LISTEN) {
932 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
933 			    "new connection for uid %d from PID %d "
934 			    "which is not the listen process",
935 			    proc->pid, client->euid);
936 		} else
937 			ret = 1;
938 		break;
939 	case GOTD_IMSG_ACCESS_GRANTED:
940 		if (proc->type != PROC_AUTH) {
941 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
942 			    "authentication of uid %d from PID %d "
943 			    "which is not the auth process",
944 			    proc->pid, client->euid);
945 		} else
946 			ret = 1;
947 		break;
948 	case GOTD_IMSG_CLIENT_SESSION_READY:
949 		if (proc->type != PROC_SESSION_READ &&
950 		    proc->type != PROC_SESSION_WRITE) {
951 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
952 			    "unexpected \"ready\" signal from PID %d",
953 			    proc->pid);
954 		} else
955 			ret = 1;
956 		break;
957 	case GOTD_IMSG_REPO_CHILD_READY:
958 		if (proc->type != PROC_REPO_READ &&
959 		    proc->type != PROC_REPO_WRITE) {
960 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
961 			    "unexpected \"ready\" signal from PID %d",
962 			    proc->pid);
963 		} else
964 			ret = 1;
965 		break;
966 	case GOTD_IMSG_PACKFILE_DONE:
967 		err = ensure_proc_is_reading(client, proc);
968 		if (err)
969 			log_warnx("uid %d: %s", client->euid, err->msg);
970 		else
971 			ret = 1;
972 		break;
973 	case GOTD_IMSG_PACKFILE_INSTALL:
974 	case GOTD_IMSG_REF_UPDATES_START:
975 	case GOTD_IMSG_REF_UPDATE:
976 		err = ensure_proc_is_writing(client, proc);
977 		if (err)
978 			log_warnx("uid %d: %s", client->euid, err->msg);
979 		else
980 			ret = 1;
981 		break;
982 	default:
983 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
984 		break;
985 	}
986 
987 	return ret;
988 }
989 
990 static const struct got_error *
991 connect_repo_child(struct gotd_client *client,
992     struct gotd_child_proc *repo_proc)
993 {
994 	static const struct got_error *err;
995 	struct gotd_imsgev *session_iev = &client->session->iev;
996 	struct gotd_imsg_connect_repo_child ireq;
997 	int pipe[2];
998 	int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
999 
1000 #ifdef SOCK_CLOEXEC
1001 	sock_flags |= SOCK_CLOEXEC;
1002 #endif
1003 
1004 	if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED)
1005 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1006 		    "unexpected repo child ready signal received");
1007 
1008 	if (socketpair(AF_UNIX, sock_flags, PF_UNSPEC, pipe) == -1)
1009 		fatal("socketpair");
1010 
1011 	memset(&ireq, 0, sizeof(ireq));
1012 	ireq.client_id = client->id;
1013 	ireq.proc_id = repo_proc->type;
1014 
1015 	/* Pass repo child pipe to session child process. */
1016 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1017 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1018 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1019 		close(pipe[0]);
1020 		close(pipe[1]);
1021 		return err;
1022 	}
1023 
1024 	/* Pass session child pipe to repo child process. */
1025 	if (gotd_imsg_compose_event(&repo_proc->iev,
1026 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1027 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1028 		close(pipe[1]);
1029 		return err;
1030 	}
1031 
1032 	return NULL;
1033 }
1034 
1035 static void
1036 gotd_dispatch_listener(int fd, short event, void *arg)
1037 {
1038 	struct gotd_imsgev *iev = arg;
1039 	struct imsgbuf *ibuf = &iev->ibuf;
1040 	struct gotd_child_proc *proc = gotd.listen_proc;
1041 	ssize_t n;
1042 	int shut = 0;
1043 	struct imsg imsg;
1044 
1045 	if (proc->iev.ibuf.fd != fd)
1046 		fatalx("%s: unexpected fd %d", __func__, fd);
1047 
1048 	if (event & EV_READ) {
1049 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1050 			fatal("imsg_read error");
1051 		if (n == 0) {
1052 			/* Connection closed. */
1053 			shut = 1;
1054 			goto done;
1055 		}
1056 	}
1057 
1058 	if (event & EV_WRITE) {
1059 		n = msgbuf_write(&ibuf->w);
1060 		if (n == -1 && errno != EAGAIN)
1061 			fatal("msgbuf_write");
1062 		if (n == 0) {
1063 			/* Connection closed. */
1064 			shut = 1;
1065 			goto done;
1066 		}
1067 	}
1068 
1069 	for (;;) {
1070 		const struct got_error *err = NULL;
1071 		struct gotd_client *client = NULL;
1072 		uint32_t client_id = 0;
1073 		int do_disconnect = 0;
1074 
1075 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1076 			fatal("%s: imsg_get error", __func__);
1077 		if (n == 0)	/* No more messages. */
1078 			break;
1079 
1080 		switch (imsg.hdr.type) {
1081 		case GOTD_IMSG_ERROR:
1082 			do_disconnect = 1;
1083 			err = gotd_imsg_recv_error(&client_id, &imsg);
1084 			break;
1085 		case GOTD_IMSG_CONNECT:
1086 			err = recv_connect(&client_id, &imsg);
1087 			break;
1088 		default:
1089 			log_debug("unexpected imsg %d", imsg.hdr.type);
1090 			break;
1091 		}
1092 
1093 		client = find_client(client_id);
1094 		if (client == NULL) {
1095 			log_warnx("%s: client not found", __func__);
1096 			imsg_free(&imsg);
1097 			continue;
1098 		}
1099 
1100 		if (err)
1101 			log_warnx("uid %d: %s", client->euid, err->msg);
1102 
1103 		if (do_disconnect) {
1104 			if (err)
1105 				disconnect_on_error(client, err);
1106 			else
1107 				disconnect(client);
1108 		}
1109 
1110 		imsg_free(&imsg);
1111 	}
1112 done:
1113 	if (!shut) {
1114 		gotd_imsg_event_add(iev);
1115 	} else {
1116 		/* This pipe is dead. Remove its event handler */
1117 		event_del(&iev->ev);
1118 		event_loopexit(NULL);
1119 	}
1120 }
1121 
1122 static void
1123 gotd_dispatch_auth_child(int fd, short event, void *arg)
1124 {
1125 	const struct got_error *err = NULL;
1126 	struct gotd_imsgev *iev = arg;
1127 	struct imsgbuf *ibuf = &iev->ibuf;
1128 	struct gotd_client *client;
1129 	struct gotd_repo *repo = NULL;
1130 	ssize_t n;
1131 	int shut = 0;
1132 	struct imsg imsg;
1133 	uint32_t client_id = 0;
1134 	int do_disconnect = 0;
1135 
1136 	client = find_client_by_proc_fd(fd);
1137 	if (client == NULL) {
1138 		/* Can happen during process teardown. */
1139 		warnx("cannot find client for fd %d", fd);
1140 		shut = 1;
1141 		goto done;
1142 	}
1143 
1144 	if (client->auth == NULL)
1145 		fatalx("cannot find auth child process for fd %d", fd);
1146 
1147 	if (event & EV_READ) {
1148 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1149 			fatal("imsg_read error");
1150 		if (n == 0) {
1151 			/* Connection closed. */
1152 			shut = 1;
1153 			goto done;
1154 		}
1155 	}
1156 
1157 	if (event & EV_WRITE) {
1158 		n = msgbuf_write(&ibuf->w);
1159 		if (n == -1 && errno != EAGAIN)
1160 			fatal("msgbuf_write");
1161 		if (n == 0) {
1162 			/* Connection closed. */
1163 			shut = 1;
1164 		}
1165 		goto done;
1166 	}
1167 
1168 	if (client->auth->iev.ibuf.fd != fd)
1169 		fatalx("%s: unexpected fd %d", __func__, fd);
1170 
1171 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1172 		fatal("%s: imsg_get error", __func__);
1173 	if (n == 0)	/* No more messages. */
1174 		return;
1175 
1176 	evtimer_del(&client->tmo);
1177 
1178 	switch (imsg.hdr.type) {
1179 	case GOTD_IMSG_ERROR:
1180 		do_disconnect = 1;
1181 		err = gotd_imsg_recv_error(&client_id, &imsg);
1182 		break;
1183 	case GOTD_IMSG_ACCESS_GRANTED:
1184 		client->state = GOTD_CLIENT_STATE_ACCESS_GRANTED;
1185 		break;
1186 	default:
1187 		do_disconnect = 1;
1188 		log_debug("unexpected imsg %d", imsg.hdr.type);
1189 		break;
1190 	}
1191 
1192 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1193 		do_disconnect = 1;
1194 		log_debug("dropping imsg type %d from PID %d",
1195 		    imsg.hdr.type, client->auth->pid);
1196 	}
1197 	imsg_free(&imsg);
1198 
1199 	if (do_disconnect) {
1200 		if (err)
1201 			disconnect_on_error(client, err);
1202 		else
1203 			disconnect(client);
1204 		return;
1205 	}
1206 
1207 	repo = gotd_find_repo_by_name(client->auth->repo_name, &gotd);
1208 	if (repo == NULL) {
1209 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1210 		goto done;
1211 	}
1212 	kill_auth_proc(client);
1213 
1214 	log_info("authenticated uid %d for repository %s",
1215 	    client->euid, repo->name);
1216 
1217 	err = start_session_child(client, repo, gotd.argv0,
1218 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1219 	if (err)
1220 		goto done;
1221 done:
1222 	if (err)
1223 		log_warnx("uid %d: %s", client->euid, err->msg);
1224 
1225 	/* We might have killed the auth process by now. */
1226 	if (client->auth != NULL) {
1227 		if (!shut) {
1228 			gotd_imsg_event_add(iev);
1229 		} else {
1230 			/* This pipe is dead. Remove its event handler */
1231 			event_del(&iev->ev);
1232 		}
1233 	}
1234 }
1235 
1236 static const struct got_error *
1237 connect_session(struct gotd_client *client)
1238 {
1239 	const struct got_error *err = NULL;
1240 	struct gotd_imsg_connect iconnect;
1241 	int s;
1242 
1243 	memset(&iconnect, 0, sizeof(iconnect));
1244 
1245 	s = dup(client->fd);
1246 	if (s == -1)
1247 		return got_error_from_errno("dup");
1248 
1249 	iconnect.client_id = client->id;
1250 	iconnect.euid = client->euid;
1251 	iconnect.egid = client->egid;
1252 
1253 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1254 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1255 		err = got_error_from_errno("imsg compose CONNECT");
1256 		close(s);
1257 		return err;
1258 	}
1259 
1260 	/*
1261 	 * We are no longer interested in messages from this client.
1262 	 * Further client requests will be handled by the session process.
1263 	 */
1264 	msgbuf_clear(&client->iev.ibuf.w);
1265 	imsg_clear(&client->iev.ibuf);
1266 	event_del(&client->iev.ev);
1267 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1268 
1269 	return NULL;
1270 }
1271 
1272 static void
1273 gotd_dispatch_client_session(int fd, short event, void *arg)
1274 {
1275 	struct gotd_imsgev *iev = arg;
1276 	struct imsgbuf *ibuf = &iev->ibuf;
1277 	struct gotd_child_proc *proc = NULL;
1278 	struct gotd_client *client = NULL;
1279 	ssize_t n;
1280 	int shut = 0;
1281 	struct imsg imsg;
1282 
1283 	client = find_client_by_proc_fd(fd);
1284 	if (client == NULL) {
1285 		/* Can happen during process teardown. */
1286 		warnx("cannot find client for fd %d", fd);
1287 		shut = 1;
1288 		goto done;
1289 	}
1290 
1291 	if (event & EV_READ) {
1292 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1293 			fatal("imsg_read error");
1294 		if (n == 0) {
1295 			/* Connection closed. */
1296 			shut = 1;
1297 			goto done;
1298 		}
1299 	}
1300 
1301 	if (event & EV_WRITE) {
1302 		n = msgbuf_write(&ibuf->w);
1303 		if (n == -1 && errno != EAGAIN)
1304 			fatal("msgbuf_write");
1305 		if (n == 0) {
1306 			/* Connection closed. */
1307 			shut = 1;
1308 			goto done;
1309 		}
1310 	}
1311 
1312 	proc = client->session;
1313 	if (proc == NULL)
1314 		fatalx("cannot find session child process for fd %d", fd);
1315 
1316 	for (;;) {
1317 		const struct got_error *err = NULL;
1318 		uint32_t client_id = 0;
1319 		int do_disconnect = 0, do_start_repo_child = 0;
1320 
1321 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1322 			fatal("%s: imsg_get error", __func__);
1323 		if (n == 0)	/* No more messages. */
1324 			break;
1325 
1326 		switch (imsg.hdr.type) {
1327 		case GOTD_IMSG_ERROR:
1328 			do_disconnect = 1;
1329 			err = gotd_imsg_recv_error(&client_id, &imsg);
1330 			break;
1331 		case GOTD_IMSG_CLIENT_SESSION_READY:
1332 			if (client->state != GOTD_CLIENT_STATE_ACCESS_GRANTED) {
1333 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1334 				break;
1335 			}
1336 			do_start_repo_child = 1;
1337 			break;
1338 		case GOTD_IMSG_DISCONNECT:
1339 			do_disconnect = 1;
1340 			break;
1341 		default:
1342 			log_debug("unexpected imsg %d", imsg.hdr.type);
1343 			break;
1344 		}
1345 
1346 		if (!verify_imsg_src(client, proc, &imsg)) {
1347 			log_debug("dropping imsg type %d from PID %d",
1348 			    imsg.hdr.type, proc->pid);
1349 			imsg_free(&imsg);
1350 			continue;
1351 		}
1352 		if (err)
1353 			log_warnx("uid %d: %s", client->euid, err->msg);
1354 
1355 		if (do_start_repo_child) {
1356 			struct gotd_repo *repo;
1357 			const char *name = client->session->repo_name;
1358 
1359 			repo = gotd_find_repo_by_name(name, &gotd);
1360 			if (repo != NULL) {
1361 				enum gotd_procid proc_type;
1362 
1363 				if (client->required_auth & GOTD_AUTH_WRITE)
1364 					proc_type = PROC_REPO_WRITE;
1365 				else
1366 					proc_type = PROC_REPO_READ;
1367 
1368 				err = start_repo_child(client, proc_type, repo,
1369 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1370 				    gotd.verbosity);
1371 			} else
1372 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1373 
1374 			if (err) {
1375 				log_warnx("uid %d: %s", client->euid, err->msg);
1376 				do_disconnect = 1;
1377 			}
1378 		}
1379 
1380 		if (do_disconnect) {
1381 			if (err)
1382 				disconnect_on_error(client, err);
1383 			else
1384 				disconnect(client);
1385 		}
1386 
1387 		imsg_free(&imsg);
1388 	}
1389 done:
1390 	if (!shut) {
1391 		gotd_imsg_event_add(iev);
1392 	} else {
1393 		/* This pipe is dead. Remove its event handler */
1394 		event_del(&iev->ev);
1395 		disconnect(client);
1396 	}
1397 }
1398 
1399 static void
1400 gotd_dispatch_repo_child(int fd, short event, void *arg)
1401 {
1402 	struct gotd_imsgev *iev = arg;
1403 	struct imsgbuf *ibuf = &iev->ibuf;
1404 	struct gotd_child_proc *proc = NULL;
1405 	struct gotd_client *client;
1406 	ssize_t n;
1407 	int shut = 0;
1408 	struct imsg imsg;
1409 
1410 	client = find_client_by_proc_fd(fd);
1411 	if (client == NULL) {
1412 		/* Can happen during process teardown. */
1413 		warnx("cannot find client for fd %d", fd);
1414 		shut = 1;
1415 		goto done;
1416 	}
1417 
1418 	if (event & EV_READ) {
1419 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1420 			fatal("imsg_read error");
1421 		if (n == 0) {
1422 			/* Connection closed. */
1423 			shut = 1;
1424 			goto done;
1425 		}
1426 	}
1427 
1428 	if (event & EV_WRITE) {
1429 		n = msgbuf_write(&ibuf->w);
1430 		if (n == -1 && errno != EAGAIN)
1431 			fatal("msgbuf_write");
1432 		if (n == 0) {
1433 			/* Connection closed. */
1434 			shut = 1;
1435 			goto done;
1436 		}
1437 	}
1438 
1439 	proc = client->repo;
1440 	if (proc == NULL)
1441 		fatalx("cannot find child process for fd %d", fd);
1442 
1443 	for (;;) {
1444 		const struct got_error *err = NULL;
1445 		uint32_t client_id = 0;
1446 		int do_disconnect = 0;
1447 
1448 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1449 			fatal("%s: imsg_get error", __func__);
1450 		if (n == 0)	/* No more messages. */
1451 			break;
1452 
1453 		switch (imsg.hdr.type) {
1454 		case GOTD_IMSG_ERROR:
1455 			do_disconnect = 1;
1456 			err = gotd_imsg_recv_error(&client_id, &imsg);
1457 			break;
1458 		case GOTD_IMSG_REPO_CHILD_READY:
1459 			err = connect_session(client);
1460 			if (err)
1461 				break;
1462 			err = connect_repo_child(client, proc);
1463 			break;
1464 		default:
1465 			log_debug("unexpected imsg %d", imsg.hdr.type);
1466 			break;
1467 		}
1468 
1469 		if (!verify_imsg_src(client, proc, &imsg)) {
1470 			log_debug("dropping imsg type %d from PID %d",
1471 			    imsg.hdr.type, proc->pid);
1472 			imsg_free(&imsg);
1473 			continue;
1474 		}
1475 		if (err)
1476 			log_warnx("uid %d: %s", client->euid, err->msg);
1477 
1478 		if (do_disconnect) {
1479 			if (err)
1480 				disconnect_on_error(client, err);
1481 			else
1482 				disconnect(client);
1483 		}
1484 
1485 		imsg_free(&imsg);
1486 	}
1487 done:
1488 	if (!shut) {
1489 		gotd_imsg_event_add(iev);
1490 	} else {
1491 		/* This pipe is dead. Remove its event handler */
1492 		event_del(&iev->ev);
1493 		disconnect(client);
1494 	}
1495 }
1496 
1497 static pid_t
1498 start_child(enum gotd_procid proc_id, const char *repo_path,
1499     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1500 {
1501 	char	*argv[11];
1502 	int	 argc = 0;
1503 	pid_t	 pid;
1504 
1505 	switch (pid = fork()) {
1506 	case -1:
1507 		fatal("cannot fork");
1508 	case 0:
1509 		break;
1510 	default:
1511 		close(fd);
1512 		return pid;
1513 	}
1514 
1515 	if (fd != GOTD_FILENO_MSG_PIPE) {
1516 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1517 			fatal("cannot setup imsg fd");
1518 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1519 		fatal("cannot setup imsg fd");
1520 
1521 	argv[argc++] = argv0;
1522 	switch (proc_id) {
1523 	case PROC_LISTEN:
1524 		argv[argc++] = (char *)"-L";
1525 		break;
1526 	case PROC_AUTH:
1527 		argv[argc++] = (char *)"-A";
1528 		break;
1529 	case PROC_SESSION_READ:
1530 		argv[argc++] = (char *)"-s";
1531 		break;
1532 	case PROC_SESSION_WRITE:
1533 		argv[argc++] = (char *)"-S";
1534 		break;
1535 	case PROC_REPO_READ:
1536 		argv[argc++] = (char *)"-R";
1537 		break;
1538 	case PROC_REPO_WRITE:
1539 		argv[argc++] = (char *)"-W";
1540 		break;
1541 	default:
1542 		fatalx("invalid process id %d", proc_id);
1543 	}
1544 
1545 	argv[argc++] = (char *)"-f";
1546 	argv[argc++] = (char *)confpath;
1547 
1548 	if (repo_path) {
1549 		argv[argc++] = (char *)"-P";
1550 		argv[argc++] = (char *)repo_path;
1551 	}
1552 
1553 	if (!daemonize)
1554 		argv[argc++] = (char *)"-d";
1555 	if (verbosity > 0)
1556 		argv[argc++] = (char *)"-v";
1557 	if (verbosity > 1)
1558 		argv[argc++] = (char *)"-v";
1559 	argv[argc++] = NULL;
1560 
1561 	execvp(argv0, argv);
1562 	fatal("execvp");
1563 }
1564 
1565 static void
1566 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1567 {
1568 	struct gotd_child_proc *proc;
1569 	int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1570 
1571 #ifdef SOCK_CLOEXEC
1572 	sock_flags |= SOCK_CLOEXEC;
1573 #endif
1574 
1575 	proc = calloc(1, sizeof(*proc));
1576 	if (proc == NULL)
1577 		fatal("calloc");
1578 
1579 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1580 
1581 	/* proc->tmo is initialized in main() after event_init() */
1582 
1583 	proc->type = PROC_LISTEN;
1584 
1585 	if (socketpair(AF_UNIX, sock_flags,
1586 	    PF_UNSPEC, proc->pipe) == -1)
1587 		fatal("socketpair");
1588 
1589 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1590 	    proc->pipe[1], daemonize, verbosity);
1591 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1592 	proc->iev.handler = gotd_dispatch_listener;
1593 	proc->iev.events = EV_READ;
1594 	proc->iev.handler_arg = NULL;
1595 
1596 	gotd.listen_proc = proc;
1597 }
1598 
1599 static const struct got_error *
1600 start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1601     char *argv0, const char *confpath, int daemonize, int verbosity)
1602 {
1603 	struct gotd_child_proc *proc;
1604 	int sock_flags = SOCK_STREAM | SOCK_NONBLOCK;
1605 
1606 #ifdef SOCK_CLOEXEC
1607 	sock_flags |= SOCK_CLOEXEC;
1608 #endif
1609 
1610 	proc = calloc(1, sizeof(*proc));
1611 	if (proc == NULL)
1612 		return got_error_from_errno("calloc");
1613 
1614 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1615 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1616 
1617 	if (client_is_reading(client))
1618 		proc->type = PROC_SESSION_READ;
1619 	else
1620 		proc->type = PROC_SESSION_WRITE;
1621 	if (strlcpy(proc->repo_name, repo->name,
1622 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1623 		fatalx("repository name too long: %s", repo->name);
1624 	log_debug("starting client uid %d session for repository %s",
1625 	    client->euid, repo->name);
1626 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1627 	    sizeof(proc->repo_path))
1628 		fatalx("repository path too long: %s", repo->path);
1629 	if (socketpair(AF_UNIX, sock_flags, PF_UNSPEC, proc->pipe) == -1)
1630 		fatal("socketpair");
1631 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1632 	    confpath, proc->pipe[1], daemonize, verbosity);
1633 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1634 	log_debug("proc %s %s is on fd %d",
1635 	    gotd_proc_names[proc->type], proc->repo_path,
1636 	    proc->pipe[0]);
1637 	proc->iev.handler = gotd_dispatch_client_session;
1638 	proc->iev.events = EV_READ;
1639 	proc->iev.handler_arg = NULL;
1640 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1641 	    gotd_dispatch_client_session, &proc->iev);
1642 	gotd_imsg_event_add(&proc->iev);
1643 
1644 	client->session = proc;
1645 	return NULL;
1646 }
1647 
1648 static const struct got_error *
1649 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1650     struct gotd_repo *repo, char *argv0, const char *confpath,
1651     int daemonize, int verbosity)
1652 {
1653 	struct gotd_child_proc *proc;
1654 	int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1655 
1656 #ifdef SOCK_CLOEXEC
1657 	sock_flags |= SOCK_CLOEXEC;
1658 #endif
1659 
1660 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1661 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1662 
1663 	proc = calloc(1, sizeof(*proc));
1664 	if (proc == NULL)
1665 		return got_error_from_errno("calloc");
1666 
1667 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1668 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1669 
1670 	proc->type = proc_type;
1671 	if (strlcpy(proc->repo_name, repo->name,
1672 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1673 		fatalx("repository name too long: %s", repo->name);
1674 	log_debug("starting %s for repository %s",
1675 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1676 
1677 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1678 	    sizeof(proc->repo_path))
1679 		fatalx("repository path too long: %s", repo->path);
1680 	if (realpath(repo->path, proc->repo_path) == NULL)
1681 		fatal("%s", repo->path);
1682 	if (socketpair(AF_UNIX, sock_flags,
1683 	    PF_UNSPEC, proc->pipe) == -1)
1684 		fatal("socketpair");
1685 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1686 	    confpath, proc->pipe[1], daemonize, verbosity);
1687 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1688 	log_debug("proc %s %s is on fd %d",
1689 	    gotd_proc_names[proc->type], proc->repo_path,
1690 	    proc->pipe[0]);
1691 	proc->iev.handler = gotd_dispatch_repo_child;
1692 	proc->iev.events = EV_READ;
1693 	proc->iev.handler_arg = NULL;
1694 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1695 	    gotd_dispatch_repo_child, &proc->iev);
1696 	gotd_imsg_event_add(&proc->iev);
1697 
1698 	client->repo = proc;
1699 	return NULL;
1700 }
1701 
1702 static const struct got_error *
1703 start_auth_child(struct gotd_client *client, int required_auth,
1704     struct gotd_repo *repo, char *argv0, const char *confpath,
1705     int daemonize, int verbosity)
1706 {
1707 	const struct got_error *err = NULL;
1708 	struct gotd_child_proc *proc;
1709 	struct gotd_imsg_auth iauth;
1710 	int fd;
1711 	int sock_flags = SOCK_STREAM|SOCK_NONBLOCK;
1712 
1713 #ifdef SOCK_CLOEXEC
1714 	sock_flags |= SOCK_CLOEXEC;
1715 #endif
1716 
1717 	memset(&iauth, 0, sizeof(iauth));
1718 
1719 	fd = dup(client->fd);
1720 	if (fd == -1)
1721 		return got_error_from_errno("dup");
1722 
1723 	proc = calloc(1, sizeof(*proc));
1724 	if (proc == NULL) {
1725 		err = got_error_from_errno("calloc");
1726 		close(fd);
1727 		return err;
1728 	}
1729 
1730 	TAILQ_INSERT_HEAD(&procs, proc, entry);
1731 	evtimer_set(&proc->tmo, kill_proc_timeout, proc);
1732 
1733 	proc->type = PROC_AUTH;
1734 	if (strlcpy(proc->repo_name, repo->name,
1735 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1736 		fatalx("repository name too long: %s", repo->name);
1737 	log_debug("starting auth for uid %d repository %s",
1738 	    client->euid, repo->name);
1739 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1740 	    sizeof(proc->repo_path))
1741 		fatalx("repository path too long: %s", repo->path);
1742 	if (realpath(repo->path, proc->repo_path) == NULL)
1743 		fatal("%s", repo->path);
1744 	if (socketpair(AF_UNIX, sock_flags,
1745 	    PF_UNSPEC, proc->pipe) == -1)
1746 		fatal("socketpair");
1747 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1748 	    confpath, proc->pipe[1], daemonize, verbosity);
1749 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1750 	log_debug("proc %s %s is on fd %d",
1751 	    gotd_proc_names[proc->type], proc->repo_path,
1752 	    proc->pipe[0]);
1753 	proc->iev.handler = gotd_dispatch_auth_child;
1754 	proc->iev.events = EV_READ;
1755 	proc->iev.handler_arg = NULL;
1756 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1757 	    gotd_dispatch_auth_child, &proc->iev);
1758 	gotd_imsg_event_add(&proc->iev);
1759 
1760 	iauth.euid = client->euid;
1761 	iauth.egid = client->egid;
1762 	iauth.required_auth = required_auth;
1763 	iauth.client_id = client->id;
1764 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1765 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1766 		log_warn("imsg compose AUTHENTICATE");
1767 		close(fd);
1768 		/* Let the auth_timeout handler tidy up. */
1769 	}
1770 
1771 	client->auth = proc;
1772 	client->required_auth = required_auth;
1773 	return NULL;
1774 }
1775 
1776 static void
1777 apply_unveil_repo_readonly(const char *repo_path, int need_tmpdir)
1778 {
1779 	if (need_tmpdir) {
1780 		if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1781 			fatal("unveil %s", GOT_TMPDIR_STR);
1782 	}
1783 
1784 	if (unveil(repo_path, "r") == -1)
1785 		fatal("unveil %s", repo_path);
1786 
1787 	if (unveil(NULL, NULL) == -1)
1788 		fatal("unveil");
1789 }
1790 
1791 static void
1792 apply_unveil_repo_readwrite(const char *repo_path)
1793 {
1794 	if (unveil(repo_path, "rwc") == -1)
1795 		fatal("unveil %s", repo_path);
1796 
1797 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1798 		fatal("unveil %s", GOT_TMPDIR_STR);
1799 
1800 	if (unveil(NULL, NULL) == -1)
1801 		fatal("unveil");
1802 }
1803 
1804 static void
1805 apply_unveil_none(void)
1806 {
1807 	if (unveil("/", "") == -1)
1808 		fatal("unveil");
1809 
1810 	if (unveil(NULL, NULL) == -1)
1811 		fatal("unveil");
1812 }
1813 
1814 static void
1815 apply_unveil_selfexec(void)
1816 {
1817 	if (unveil(gotd.argv0, "x") == -1)
1818 		fatal("unveil %s", gotd.argv0);
1819 
1820 	if (unveil(NULL, NULL) == -1)
1821 		fatal("unveil");
1822 }
1823 
1824 int
1825 main(int argc, char **argv)
1826 {
1827 	const struct got_error *error = NULL;
1828 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1829 	const char *confpath = GOTD_CONF_PATH;
1830 	char *argv0 = argv[0];
1831 	char title[2048];
1832 	struct passwd *pw = NULL;
1833 	char *repo_path = NULL;
1834 	enum gotd_procid proc_id = PROC_GOTD;
1835 	struct event evsigint, evsigterm, evsighup, evsigusr1, evsigchld;
1836 	int *pack_fds = NULL, *temp_fds = NULL;
1837 	struct gotd_repo *repo = NULL;
1838 
1839 	TAILQ_INIT(&procs);
1840 
1841 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1842 
1843 	while ((ch = getopt(argc, argv, "Adf:LnP:RsSvW")) != -1) {
1844 		switch (ch) {
1845 		case 'A':
1846 			proc_id = PROC_AUTH;
1847 			break;
1848 		case 'd':
1849 			daemonize = 0;
1850 			break;
1851 		case 'f':
1852 			confpath = optarg;
1853 			break;
1854 		case 'L':
1855 			proc_id = PROC_LISTEN;
1856 			break;
1857 		case 'n':
1858 			noaction = 1;
1859 			break;
1860 		case 'P':
1861 			repo_path = realpath(optarg, NULL);
1862 			if (repo_path == NULL)
1863 				fatal("realpath '%s'", optarg);
1864 			break;
1865 		case 'R':
1866 			proc_id = PROC_REPO_READ;
1867 			break;
1868 		case 's':
1869 			proc_id = PROC_SESSION_READ;
1870 			break;
1871 		case 'S':
1872 			proc_id = PROC_SESSION_WRITE;
1873 			break;
1874 		case 'v':
1875 			if (verbosity < 3)
1876 				verbosity++;
1877 			break;
1878 		case 'W':
1879 			proc_id = PROC_REPO_WRITE;
1880 			break;
1881 		default:
1882 			usage();
1883 		}
1884 	}
1885 
1886 	argc -= optind;
1887 	argv += optind;
1888 
1889 	if (argc != 0)
1890 		usage();
1891 
1892 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1893 		fatalx("need root privileges");
1894 
1895 	if (parse_config(confpath, proc_id, &gotd) != 0)
1896 		return 1;
1897 
1898 	pw = getpwnam(gotd.user_name);
1899 	if (pw == NULL)
1900 		fatalx("user %s not found", gotd.user_name);
1901 
1902 	if (pw->pw_uid == 0)
1903 		fatalx("cannot run %s as the superuser", getprogname());
1904 
1905 	if (noaction) {
1906 		fprintf(stderr, "configuration OK\n");
1907 		return 0;
1908 	}
1909 
1910 	gotd.argv0 = argv0;
1911 	gotd.daemonize = daemonize;
1912 	gotd.verbosity = verbosity;
1913 	gotd.confpath = confpath;
1914 
1915 	/* Require an absolute path in argv[0] for reliable re-exec. */
1916 	if (!got_path_is_absolute(argv0))
1917 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1918 
1919 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1920 	log_setverbose(verbosity);
1921 
1922 	if (proc_id == PROC_GOTD) {
1923 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1924 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1925 		if (daemonize && daemon(1, 0) == -1)
1926 			fatal("daemon");
1927 		gotd.pid = getpid();
1928 		start_listener(argv0, confpath, daemonize, verbosity);
1929 	} else if (proc_id == PROC_LISTEN) {
1930 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1931 		if (verbosity) {
1932 			log_info("socket: %s", gotd.unix_socket_path);
1933 			log_info("user: %s", pw->pw_name);
1934 		}
1935 
1936 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1937 		    pw->pw_gid);
1938 		if (fd == -1) {
1939 			fatal("cannot listen on unix socket %s",
1940 			    gotd.unix_socket_path);
1941 		}
1942 	} else if (proc_id == PROC_AUTH) {
1943 		snprintf(title, sizeof(title), "%s %s",
1944 		    gotd_proc_names[proc_id], repo_path);
1945 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1946 	    proc_id == PROC_SESSION_READ || proc_id == PROC_SESSION_WRITE) {
1947 		error = got_repo_pack_fds_open(&pack_fds);
1948 		if (error != NULL)
1949 			fatalx("cannot open pack tempfiles: %s", error->msg);
1950 		error = got_repo_temp_fds_open(&temp_fds);
1951 		if (error != NULL)
1952 			fatalx("cannot open pack tempfiles: %s", error->msg);
1953 		if (repo_path == NULL)
1954 			fatalx("repository path not specified");
1955 		snprintf(title, sizeof(title), "%s %s",
1956 		    gotd_proc_names[proc_id], repo_path);
1957 	} else
1958 		fatal("invalid process id %d", proc_id);
1959 
1960 	setproctitle("%s", title);
1961 	log_procinit(title);
1962 
1963 	/* Drop root privileges. */
1964 	if (setgid(pw->pw_gid) == -1)
1965 		fatal("setgid %d failed", pw->pw_gid);
1966 	if (setuid(pw->pw_uid) == -1)
1967 		fatal("setuid %d failed", pw->pw_uid);
1968 
1969 	event_init();
1970 
1971 	switch (proc_id) {
1972 	case PROC_GOTD:
1973 #ifndef PROFILE
1974 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1975 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1976 			err(1, "pledge");
1977 #endif
1978 		break;
1979 	case PROC_LISTEN:
1980 #ifndef PROFILE
1981 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1982 			err(1, "pledge");
1983 #endif
1984 		/*
1985 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1986 		 * sockets by revoking all filesystem access via unveil(2).
1987 		 */
1988 		apply_unveil_none();
1989 
1990 		listen_main(title, fd, gotd.connection_limits,
1991 		    gotd.nconnection_limits);
1992 		/* NOTREACHED */
1993 		break;
1994 	case PROC_AUTH:
1995 #ifndef PROFILE
1996 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1997 			err(1, "pledge");
1998 #endif
1999 		/*
2000 		 * We need the "unix" pledge promise for getpeername(2) only.
2001 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
2002 		 * filesystem access via unveil(2). Access to password database
2003 		 * files will still work since "getpw" bypasses unveil(2).
2004 		 */
2005 		apply_unveil_none();
2006 
2007 		auth_main(title, &gotd.repos, repo_path);
2008 		/* NOTREACHED */
2009 		break;
2010 	case PROC_SESSION_READ:
2011 	case PROC_SESSION_WRITE:
2012 #ifndef PROFILE
2013 		/*
2014 		 * The "recvfd" promise is only needed during setup and
2015 		 * will be removed in a later pledge(2) call.
2016 		 */
2017 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
2018 		    "unveil", NULL) == -1)
2019 			err(1, "pledge");
2020 #endif
2021 		if (proc_id == PROC_SESSION_READ)
2022 			apply_unveil_repo_readonly(repo_path, 1);
2023 		else
2024 			apply_unveil_repo_readwrite(repo_path);
2025 		session_main(title, repo_path, pack_fds, temp_fds,
2026 		    &gotd.request_timeout, proc_id);
2027 		/* NOTREACHED */
2028 		break;
2029 	case PROC_REPO_READ:
2030 #ifndef PROFILE
2031 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2032 			err(1, "pledge");
2033 #endif
2034 		apply_unveil_repo_readonly(repo_path, 0);
2035 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2036 		/* NOTREACHED */
2037 		exit(0);
2038 	case PROC_REPO_WRITE:
2039 #ifndef PROFILE
2040 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2041 			err(1, "pledge");
2042 #endif
2043 		apply_unveil_repo_readonly(repo_path, 0);
2044 		repo = gotd_find_repo_by_path(repo_path, &gotd);
2045 		if (repo == NULL)
2046 			fatalx("no repository for path %s", repo_path);
2047 		repo_write_main(title, repo_path, pack_fds, temp_fds,
2048 		    &repo->protected_tag_namespaces,
2049 		    &repo->protected_branch_namespaces,
2050 		    &repo->protected_branches);
2051 		/* NOTREACHED */
2052 		exit(0);
2053 	default:
2054 		fatal("invalid process id %d", proc_id);
2055 	}
2056 
2057 	if (proc_id != PROC_GOTD)
2058 		fatal("invalid process id %d", proc_id);
2059 
2060 	evtimer_set(&gotd.listen_proc->tmo, kill_proc_timeout,
2061 	    gotd.listen_proc);
2062 
2063 	apply_unveil_selfexec();
2064 
2065 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2066 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2067 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2068 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2069 	signal_set(&evsigchld, SIGCHLD, gotd_sighdlr, NULL);
2070 	signal(SIGPIPE, SIG_IGN);
2071 
2072 	signal_add(&evsigint, NULL);
2073 	signal_add(&evsigterm, NULL);
2074 	signal_add(&evsighup, NULL);
2075 	signal_add(&evsigusr1, NULL);
2076 	signal_add(&evsigchld, NULL);
2077 
2078 	gotd_imsg_event_add(&gotd.listen_proc->iev);
2079 
2080 	event_dispatch();
2081 
2082 	free(repo_path);
2083 	gotd_shutdown();
2084 
2085 	return 0;
2086 }