Game of Trees Repos

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Date:: Thu Jan 5 15:34:39 2023 UTC
Message:: gotd: delete unreachable code after gotd_shutdown()
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1 /*
2  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/tree.h>
19 #include <sys/time.h>
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <sys/socket.h>
23 #include <sys/un.h>
24 #include <sys/wait.h>
25 
26 #include <fcntl.h>
27 #include <err.h>
28 #include <errno.h>
29 #include <event.h>
30 #include <limits.h>
31 #include <pwd.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <signal.h>
35 #include <siphash.h>
36 #include <stdarg.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <syslog.h>
41 #include <unistd.h>
42 
43 #include "got_error.h"
44 #include "got_opentemp.h"
45 #include "got_path.h"
46 #include "got_repository.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 
50 #include "got_lib_delta.h"
51 #include "got_lib_object.h"
52 #include "got_lib_object_cache.h"
53 #include "got_lib_sha1.h"
54 #include "got_lib_gitproto.h"
55 #include "got_lib_pack.h"
56 #include "got_lib_repository.h"
57 
58 #include "gotd.h"
59 #include "log.h"
60 #include "listen.h"
61 #include "auth.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 struct gotd_client {
70 	STAILQ_ENTRY(gotd_client)	 entry;
71 	enum gotd_client_state		 state;
72 	struct gotd_client_capability	*capabilities;
73 	size_t				 ncapa_alloc;
74 	size_t				 ncapabilities;
75 	uint32_t			 id;
76 	int				 fd;
77 	int				 delta_cache_fd;
78 	struct gotd_imsgev		 iev;
79 	struct event			 tmo;
80 	uid_t				 euid;
81 	gid_t				 egid;
82 	struct gotd_child_proc		*repo_read;
83 	struct gotd_child_proc		*repo_write;
84 	struct gotd_child_proc		*auth;
85 	int				 required_auth;
86 	char				*packfile_path;
87 	char				*packidx_path;
88 	int				 nref_updates;
89 };
90 STAILQ_HEAD(gotd_clients, gotd_client);
91 
92 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
93 static SIPHASH_KEY clients_hash_key;
94 volatile int client_cnt;
95 static struct timeval auth_timeout = { 5, 0 };
96 static struct gotd gotd;
97 
98 void gotd_sighdlr(int sig, short event, void *arg);
99 static void gotd_shutdown(void);
100 static const struct got_error *start_repo_child(struct gotd_client *,
101     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
102 static const struct got_error *start_auth_child(struct gotd_client *, int,
103     struct gotd_repo *, char *, const char *, int, int);
104 static void kill_proc(struct gotd_child_proc *, int);
105 
106 __dead static void
107 usage()
108 {
109 	fprintf(stderr, "usage: %s [-dv] [-f config-file]\n", getprogname());
110 	exit(1);
111 }
112 
113 static int
114 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
115 {
116 	struct sockaddr_un sun;
117 	int fd = -1;
118 	mode_t old_umask, mode;
119 
120 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
121 	if (fd == -1) {
122 		log_warn("socket");
123 		return -1;
124 	}
125 
126 	sun.sun_family = AF_UNIX;
127 	if (strlcpy(sun.sun_path, unix_socket_path,
128 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
129 		log_warnx("%s: name too long", unix_socket_path);
130 		close(fd);
131 		return -1;
132 	}
133 
134 	if (unlink(unix_socket_path) == -1) {
135 		if (errno != ENOENT) {
136 			log_warn("unlink %s", unix_socket_path);
137 			close(fd);
138 			return -1;
139 		}
140 	}
141 
142 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
143 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
144 
145 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
146 		log_warn("bind: %s", unix_socket_path);
147 		close(fd);
148 		umask(old_umask);
149 		return -1;
150 	}
151 
152 	umask(old_umask);
153 
154 	if (chmod(unix_socket_path, mode) == -1) {
155 		log_warn("chmod %o %s", mode, unix_socket_path);
156 		close(fd);
157 		unlink(unix_socket_path);
158 		return -1;
159 	}
160 
161 	if (chown(unix_socket_path, uid, gid) == -1) {
162 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
163 		close(fd);
164 		unlink(unix_socket_path);
165 		return -1;
166 	}
167 
168 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
169 		log_warn("listen");
170 		close(fd);
171 		unlink(unix_socket_path);
172 		return -1;
173 	}
174 
175 	return fd;
176 }
177 
178 static uint64_t
179 client_hash(uint32_t client_id)
180 {
181 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
182 }
183 
184 static void
185 add_client(struct gotd_client *client)
186 {
187 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
188 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
189 	client_cnt++;
190 }
191 
192 static struct gotd_client *
193 find_client(uint32_t client_id)
194 {
195 	uint64_t slot;
196 	struct gotd_client *c;
197 
198 	slot = client_hash(client_id) % nitems(gotd_clients);
199 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
200 		if (c->id == client_id)
201 			return c;
202 	}
203 
204 	return NULL;
205 }
206 
207 static struct gotd_child_proc *
208 get_client_proc(struct gotd_client *client)
209 {
210 	if (client->repo_read && client->repo_write) {
211 		fatalx("uid %d is reading and writing in the same session",
212 		    client->euid);
213 		/* NOTREACHED */
214 	}
215 
216 	if (client->repo_read)
217 		return client->repo_read;
218 	else if (client->repo_write)
219 		return client->repo_write;
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 			struct gotd_child_proc *proc = get_client_proc(c);
234 			if (proc && proc->iev.ibuf.fd == fd)
235 				return c;
236 			if (c->auth && c->auth->iev.ibuf.fd == fd)
237 				return c;
238 		}
239 	}
240 
241 	return NULL;
242 }
243 
244 static int
245 client_is_reading(struct gotd_client *client)
246 {
247 	return client->repo_read != NULL;
248 }
249 
250 static int
251 client_is_writing(struct gotd_client *client)
252 {
253 	return client->repo_write != NULL;
254 }
255 
256 static const struct got_error *
257 ensure_client_is_reading(struct gotd_client *client)
258 {
259 	if (!client_is_reading(client)) {
260 		return got_error_fmt(GOT_ERR_BAD_PACKET,
261 		    "uid %d made a read-request but is not reading from "
262 		    "a repository", client->euid);
263 	}
264 
265 	return NULL;
266 }
267 
268 static const struct got_error *
269 ensure_client_is_writing(struct gotd_client *client)
270 {
271 	if (!client_is_writing(client)) {
272 		return got_error_fmt(GOT_ERR_BAD_PACKET,
273 		    "uid %d made a write-request but is not writing to "
274 		    "a repository", client->euid);
275 	}
276 
277 	return NULL;
278 }
279 
280 static const struct got_error *
281 ensure_client_is_not_writing(struct gotd_client *client)
282 {
283 	if (client_is_writing(client)) {
284 		return got_error_fmt(GOT_ERR_BAD_PACKET,
285 		    "uid %d made a read-request but is writing to "
286 		    "a repository", client->euid);
287 	}
288 
289 	return NULL;
290 }
291 
292 static const struct got_error *
293 ensure_client_is_not_reading(struct gotd_client *client)
294 {
295 	if (client_is_reading(client)) {
296 		return got_error_fmt(GOT_ERR_BAD_PACKET,
297 		    "uid %d made a write-request but is reading from "
298 		    "a repository", client->euid);
299 	}
300 
301 	return NULL;
302 }
303 
304 static void
305 wait_for_child(pid_t child_pid)
306 {
307 	pid_t pid;
308 	int status;
309 
310 	log_debug("waiting for child PID %ld to terminate",
311 	    (long)child_pid);
312 
313 	do {
314 		pid = waitpid(child_pid, &status, WNOHANG);
315 		if (pid == -1) {
316 			if (errno != EINTR && errno != ECHILD)
317 				fatal("wait");
318 		} else if (WIFSIGNALED(status)) {
319 			log_warnx("child PID %ld terminated; signal %d",
320 			    (long)pid, WTERMSIG(status));
321 		}
322 	} while (pid != -1 || (pid == -1 && errno == EINTR));
323 }
324 
325 static void
326 kill_auth_proc(struct gotd_client *client)
327 {
328 	struct gotd_child_proc *proc;
329 
330 	if (client->auth == NULL)
331 		return;
332 
333 	proc = client->auth;
334 	client->auth = NULL;
335 
336 	event_del(&proc->iev.ev);
337 	msgbuf_clear(&proc->iev.ibuf.w);
338 	close(proc->iev.ibuf.fd);
339 	kill_proc(proc, 0);
340 	wait_for_child(proc->pid);
341 	free(proc);
342 }
343 
344 static void
345 disconnect(struct gotd_client *client)
346 {
347 	struct gotd_imsg_disconnect idisconnect;
348 	struct gotd_child_proc *proc = get_client_proc(client);
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 
356 	idisconnect.client_id = client->id;
357 	if (proc) {
358 		if (gotd_imsg_compose_event(&proc->iev,
359 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
360 		    &idisconnect, sizeof(idisconnect)) == -1)
361 			log_warn("imsg compose DISCONNECT");
362 
363 		msgbuf_clear(&proc->iev.ibuf.w);
364 		close(proc->iev.ibuf.fd);
365 		kill_proc(proc, 0);
366 		wait_for_child(proc->pid);
367 		free(proc);
368 		proc = NULL;
369 	}
370 
371 	if (gotd_imsg_compose_event(&listen_proc->iev,
372 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
373 	    &idisconnect, sizeof(idisconnect)) == -1)
374 		log_warn("imsg compose DISCONNECT");
375 
376 	slot = client_hash(client->id) % nitems(gotd_clients);
377 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
378 	imsg_clear(&client->iev.ibuf);
379 	event_del(&client->iev.ev);
380 	evtimer_del(&client->tmo);
381 	close(client->fd);
382 	if (client->delta_cache_fd != -1)
383 		close(client->delta_cache_fd);
384 	if (client->packfile_path) {
385 		if (unlink(client->packfile_path) == -1 && errno != ENOENT)
386 			log_warn("unlink %s: ", client->packfile_path);
387 		free(client->packfile_path);
388 	}
389 	if (client->packidx_path) {
390 		if (unlink(client->packidx_path) == -1 && errno != ENOENT)
391 			log_warn("unlink %s: ", client->packidx_path);
392 		free(client->packidx_path);
393 	}
394 	free(client->capabilities);
395 	free(client);
396 	client_cnt--;
397 }
398 
399 static void
400 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
401 {
402 	struct imsgbuf ibuf;
403 
404 	log_warnx("uid %d: %s", client->euid, err->msg);
405 	if (err->code != GOT_ERR_EOF) {
406 		imsg_init(&ibuf, client->fd);
407 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
408 		imsg_clear(&ibuf);
409 	}
410 	disconnect(client);
411 }
412 
413 static const struct got_error *
414 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
415 {
416 	const struct got_error *err = NULL;
417 	struct gotd_imsg_info_repo irepo;
418 
419 	memset(&irepo, 0, sizeof(irepo));
420 
421 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
422 	    >= sizeof(irepo.repo_name))
423 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
424 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
425 	    >= sizeof(irepo.repo_path))
426 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
427 
428 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
429 	    &irepo, sizeof(irepo)) == -1) {
430 		err = got_error_from_errno("imsg compose INFO_REPO");
431 		if (err)
432 			return err;
433 	}
434 
435 	return NULL;
436 }
437 
438 static const struct got_error *
439 send_capability(struct gotd_client_capability *capa, struct gotd_imsgev* iev)
440 {
441 	const struct got_error *err = NULL;
442 	struct gotd_imsg_capability icapa;
443 	size_t len;
444 	struct ibuf *wbuf;
445 
446 	memset(&icapa, 0, sizeof(icapa));
447 
448 	icapa.key_len = strlen(capa->key);
449 	len = sizeof(icapa) + icapa.key_len;
450 	if (capa->value) {
451 		icapa.value_len = strlen(capa->value);
452 		len += icapa.value_len;
453 	}
454 
455 	wbuf = imsg_create(&iev->ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
456 	if (wbuf == NULL) {
457 		err = got_error_from_errno("imsg_create CAPABILITY");
458 		return err;
459 	}
460 
461 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
462 		return got_error_from_errno("imsg_add CAPABILITY");
463 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
464 		return got_error_from_errno("imsg_add CAPABILITY");
465 	if (capa->value) {
466 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
467 			return got_error_from_errno("imsg_add CAPABILITY");
468 	}
469 
470 	wbuf->fd = -1;
471 	imsg_close(&iev->ibuf, wbuf);
472 
473 	gotd_imsg_event_add(iev);
474 
475 	return NULL;
476 }
477 
478 static const struct got_error *
479 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
480 {
481 	const struct got_error *err = NULL;
482 	struct gotd_imsg_info_client iclient;
483 	struct gotd_child_proc *proc;
484 	size_t i;
485 
486 	memset(&iclient, 0, sizeof(iclient));
487 	iclient.euid = client->euid;
488 	iclient.egid = client->egid;
489 
490 	proc = get_client_proc(client);
491 	if (proc) {
492 		if (strlcpy(iclient.repo_name, proc->repo_path,
493 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
494 			return got_error_msg(GOT_ERR_NO_SPACE,
495 			    "repo name too long");
496 		}
497 		if (client_is_writing(client))
498 			iclient.is_writing = 1;
499 	}
500 
501 	iclient.state = client->state;
502 	iclient.ncapabilities = client->ncapabilities;
503 
504 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
505 	    &iclient, sizeof(iclient)) == -1) {
506 		err = got_error_from_errno("imsg compose INFO_CLIENT");
507 		if (err)
508 			return err;
509 	}
510 
511 	for (i = 0; i < client->ncapabilities; i++) {
512 		struct gotd_client_capability *capa;
513 		capa = &client->capabilities[i];
514 		err = send_capability(capa, iev);
515 		if (err)
516 			return err;
517 	}
518 
519 	return NULL;
520 }
521 
522 static const struct got_error *
523 send_info(struct gotd_client *client)
524 {
525 	const struct got_error *err = NULL;
526 	struct gotd_imsg_info info;
527 	uint64_t slot;
528 	struct gotd_repo *repo;
529 
530 	if (client->euid != 0)
531 		return got_error_set_errno(EPERM, "info");
532 
533 	info.pid = gotd.pid;
534 	info.verbosity = gotd.verbosity;
535 	info.nrepos = gotd.nrepos;
536 	info.nclients = client_cnt - 1;
537 
538 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
539 	    &info, sizeof(info)) == -1) {
540 		err = got_error_from_errno("imsg compose INFO");
541 		if (err)
542 			return err;
543 	}
544 
545 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
546 		err = send_repo_info(&client->iev, repo);
547 		if (err)
548 			return err;
549 	}
550 
551 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
552 		struct gotd_client *c;
553 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
554 			if (c->id == client->id)
555 				continue;
556 			err = send_client_info(&client->iev, c);
557 			if (err)
558 				return err;
559 		}
560 	}
561 
562 	return NULL;
563 }
564 
565 static const struct got_error *
566 stop_gotd(struct gotd_client *client)
567 {
568 
569 	if (client->euid != 0)
570 		return got_error_set_errno(EPERM, "stop");
571 
572 	gotd_shutdown();
573 	/* NOTREACHED */
574 	return NULL;
575 }
576 
577 static struct gotd_repo *
578 find_repo_by_name(const char *repo_name)
579 {
580 	struct gotd_repo *repo;
581 	size_t namelen;
582 
583 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
584 		namelen = strlen(repo->name);
585 		if (strncmp(repo->name, repo_name, namelen) != 0)
586 			continue;
587 		if (repo_name[namelen] == '\0' ||
588 		    strcmp(&repo_name[namelen], ".git") == 0)
589 			return repo;
590 	}
591 
592 	return NULL;
593 }
594 
595 static const struct got_error *
596 start_client_session(struct gotd_client *client, struct imsg *imsg)
597 {
598 	const struct got_error *err;
599 	struct gotd_imsg_list_refs ireq;
600 	struct gotd_repo *repo = NULL;
601 	size_t datalen;
602 
603 	log_debug("list-refs request from uid %d", client->euid);
604 
605 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
606 	if (datalen != sizeof(ireq))
607 		return got_error(GOT_ERR_PRIVSEP_LEN);
608 
609 	memcpy(&ireq, imsg->data, datalen);
610 
611 	if (ireq.client_is_reading) {
612 		err = ensure_client_is_not_writing(client);
613 		if (err)
614 			return err;
615 		repo = find_repo_by_name(ireq.repo_name);
616 		if (repo == NULL)
617 			return got_error(GOT_ERR_NOT_GIT_REPO);
618 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
619 		    gotd.argv0, gotd.confpath, gotd.daemonize,
620 		    gotd.verbosity);
621 		if (err)
622 			return err;
623 	} else {
624 		err = ensure_client_is_not_reading(client);
625 		if (err)
626 			return err;
627 		repo = find_repo_by_name(ireq.repo_name);
628 		if (repo == NULL)
629 			return got_error(GOT_ERR_NOT_GIT_REPO);
630 		err = start_auth_child(client,
631 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
632 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
633 		    gotd.verbosity);
634 		if (err)
635 			return err;
636 	}
637 
638 	/* Flow continues upon authentication successs/failure or timeout. */
639 	return NULL;
640 }
641 
642 static const struct got_error *
643 forward_want(struct gotd_client *client, struct imsg *imsg)
644 {
645 	struct gotd_imsg_want ireq;
646 	struct gotd_imsg_want iwant;
647 	size_t datalen;
648 
649 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
650 	if (datalen != sizeof(ireq))
651 		return got_error(GOT_ERR_PRIVSEP_LEN);
652 
653 	memcpy(&ireq, imsg->data, datalen);
654 
655 	memset(&iwant, 0, sizeof(iwant));
656 	memcpy(iwant.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
657 	iwant.client_id = client->id;
658 
659 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_WANT,
660 	    PROC_GOTD, -1, &iwant, sizeof(iwant)) == -1)
661 		return got_error_from_errno("imsg compose WANT");
662 
663 	return NULL;
664 }
665 
666 static const struct got_error *
667 forward_ref_update(struct gotd_client *client, struct imsg *imsg)
668 {
669 	const struct got_error *err = NULL;
670 	struct gotd_imsg_ref_update ireq;
671 	struct gotd_imsg_ref_update *iref = NULL;
672 	size_t datalen;
673 
674 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
675 	if (datalen < sizeof(ireq))
676 		return got_error(GOT_ERR_PRIVSEP_LEN);
677 	memcpy(&ireq, imsg->data, sizeof(ireq));
678 	if (datalen != sizeof(ireq) + ireq.name_len)
679 		return got_error(GOT_ERR_PRIVSEP_LEN);
680 
681 	iref = malloc(datalen);
682 	if (iref == NULL)
683 		return got_error_from_errno("malloc");
684 	memcpy(iref, imsg->data, datalen);
685 
686 	iref->client_id = client->id;
687 	if (gotd_imsg_compose_event(&client->repo_write->iev,
688 	    GOTD_IMSG_REF_UPDATE, PROC_GOTD, -1, iref, datalen) == -1)
689 		err = got_error_from_errno("imsg compose REF_UPDATE");
690 	free(iref);
691 	return err;
692 }
693 
694 static const struct got_error *
695 forward_have(struct gotd_client *client, struct imsg *imsg)
696 {
697 	struct gotd_imsg_have ireq;
698 	struct gotd_imsg_have ihave;
699 	size_t datalen;
700 
701 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
702 	if (datalen != sizeof(ireq))
703 		return got_error(GOT_ERR_PRIVSEP_LEN);
704 
705 	memcpy(&ireq, imsg->data, datalen);
706 
707 	memset(&ihave, 0, sizeof(ihave));
708 	memcpy(ihave.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
709 	ihave.client_id = client->id;
710 
711 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_HAVE,
712 	    PROC_GOTD, -1, &ihave, sizeof(ihave)) == -1)
713 		return got_error_from_errno("imsg compose HAVE");
714 
715 	return NULL;
716 }
717 
718 static int
719 client_has_capability(struct gotd_client *client, const char *capastr)
720 {
721 	struct gotd_client_capability *capa;
722 	size_t i;
723 
724 	if (client->ncapabilities == 0)
725 		return 0;
726 
727 	for (i = 0; i < client->ncapabilities; i++) {
728 		capa = &client->capabilities[i];
729 		if (strcmp(capa->key, capastr) == 0)
730 			return 1;
731 	}
732 
733 	return 0;
734 }
735 
736 static const struct got_error *
737 recv_capabilities(struct gotd_client *client, struct imsg *imsg)
738 {
739 	struct gotd_imsg_capabilities icapas;
740 	size_t datalen;
741 
742 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
743 	if (datalen != sizeof(icapas))
744 		return got_error(GOT_ERR_PRIVSEP_LEN);
745 	memcpy(&icapas, imsg->data, sizeof(icapas));
746 
747 	client->ncapa_alloc = icapas.ncapabilities;
748 	client->capabilities = calloc(client->ncapa_alloc,
749 	    sizeof(*client->capabilities));
750 	if (client->capabilities == NULL) {
751 		client->ncapa_alloc = 0;
752 		return got_error_from_errno("calloc");
753 	}
754 
755 	log_debug("expecting %zu capabilities from uid %d",
756 	    client->ncapa_alloc, client->euid);
757 	return NULL;
758 }
759 
760 static const struct got_error *
761 recv_capability(struct gotd_client *client, struct imsg *imsg)
762 {
763 	struct gotd_imsg_capability icapa;
764 	struct gotd_client_capability *capa;
765 	size_t datalen;
766 	char *key, *value = NULL;
767 
768 	if (client->capabilities == NULL ||
769 	    client->ncapabilities >= client->ncapa_alloc) {
770 		return got_error_msg(GOT_ERR_BAD_REQUEST,
771 		    "unexpected capability received");
772 	}
773 
774 	memset(&icapa, 0, sizeof(icapa));
775 
776 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
777 	if (datalen < sizeof(icapa))
778 		return got_error(GOT_ERR_PRIVSEP_LEN);
779 	memcpy(&icapa, imsg->data, sizeof(icapa));
780 
781 	if (datalen != sizeof(icapa) + icapa.key_len + icapa.value_len)
782 		return got_error(GOT_ERR_PRIVSEP_LEN);
783 
784 	key = malloc(icapa.key_len + 1);
785 	if (key == NULL)
786 		return got_error_from_errno("malloc");
787 	if (icapa.value_len > 0) {
788 		value = malloc(icapa.value_len + 1);
789 		if (value == NULL) {
790 			free(key);
791 			return got_error_from_errno("malloc");
792 		}
793 	}
794 
795 	memcpy(key, imsg->data + sizeof(icapa), icapa.key_len);
796 	key[icapa.key_len] = '\0';
797 	if (value) {
798 		memcpy(value, imsg->data + sizeof(icapa) + icapa.key_len,
799 		    icapa.value_len);
800 		value[icapa.value_len] = '\0';
801 	}
802 
803 	capa = &client->capabilities[client->ncapabilities++];
804 	capa->key = key;
805 	capa->value = value;
806 
807 	if (value)
808 		log_debug("uid %d: capability %s=%s", client->euid, key, value);
809 	else
810 		log_debug("uid %d: capability %s", client->euid, key);
811 
812 	return NULL;
813 }
814 
815 static const struct got_error *
816 send_packfile(struct gotd_client *client)
817 {
818 	const struct got_error *err = NULL;
819 	struct gotd_imsg_send_packfile ipack;
820 	struct gotd_imsg_packfile_pipe ipipe;
821 	int pipe[2];
822 
823 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
824 		return got_error_from_errno("socketpair");
825 
826 	memset(&ipack, 0, sizeof(ipack));
827 	memset(&ipipe, 0, sizeof(ipipe));
828 
829 	ipack.client_id = client->id;
830 	if (client_has_capability(client, GOT_CAPA_SIDE_BAND_64K))
831 		ipack.report_progress = 1;
832 
833 	client->delta_cache_fd = got_opentempfd();
834 	if (client->delta_cache_fd == -1)
835 		return got_error_from_errno("got_opentempfd");
836 
837 	if (gotd_imsg_compose_event(&client->repo_read->iev,
838 	    GOTD_IMSG_SEND_PACKFILE, PROC_GOTD, client->delta_cache_fd,
839 	    &ipack, sizeof(ipack)) == -1) {
840 		err = got_error_from_errno("imsg compose SEND_PACKFILE");
841 		close(pipe[0]);
842 		close(pipe[1]);
843 		return err;
844 	}
845 
846 	ipipe.client_id = client->id;
847 
848 	/* Send pack pipe end 0 to repo_read. */
849 	if (gotd_imsg_compose_event(&client->repo_read->iev,
850 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
851 	        &ipipe, sizeof(ipipe)) == -1) {
852 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
853 		close(pipe[1]);
854 		return err;
855 	}
856 
857 	/* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
858 	if (gotd_imsg_compose_event(&client->iev,
859 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
860 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
861 
862 	return err;
863 }
864 
865 static const struct got_error *
866 recv_packfile(struct gotd_client *client)
867 {
868 	const struct got_error *err = NULL;
869 	struct gotd_imsg_recv_packfile ipack;
870 	struct gotd_imsg_packfile_pipe ipipe;
871 	struct gotd_imsg_packidx_file ifile;
872 	char *basepath = NULL, *pack_path = NULL, *idx_path = NULL;
873 	int packfd = -1, idxfd = -1;
874 	int pipe[2] = { -1, -1 };
875 
876 	if (client->packfile_path) {
877 		return got_error_fmt(GOT_ERR_PRIVSEP_MSG,
878 		    "uid %d already has a pack file", client->euid);
879 	}
880 
881 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
882 		return got_error_from_errno("socketpair");
883 
884 	memset(&ipipe, 0, sizeof(ipipe));
885 	ipipe.client_id = client->id;
886 
887 	/* Send pack pipe end 0 to repo_write. */
888 	if (gotd_imsg_compose_event(&client->repo_write->iev,
889 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
890 	        &ipipe, sizeof(ipipe)) == -1) {
891 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
892 		pipe[0] = -1;
893 		goto done;
894 	}
895 	pipe[0] = -1;
896 
897 	/* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
898 	if (gotd_imsg_compose_event(&client->iev,
899 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
900 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
901 	pipe[1] = -1;
902 
903 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.pack",
904 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
905 	    client->euid) == -1) {
906 		err = got_error_from_errno("asprintf");
907 		goto done;
908 	}
909 
910 	err = got_opentemp_named_fd(&pack_path, &packfd, basepath, "");
911 	if (err)
912 		goto done;
913 
914 	free(basepath);
915 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.idx",
916 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
917 	    client->euid) == -1) {
918 		err = got_error_from_errno("asprintf");
919 		basepath = NULL;
920 		goto done;
921 	}
922 	err = got_opentemp_named_fd(&idx_path, &idxfd, basepath, "");
923 	if (err)
924 		goto done;
925 
926 	memset(&ifile, 0, sizeof(ifile));
927 	ifile.client_id = client->id;
928 	if (gotd_imsg_compose_event(&client->repo_write->iev,
929 	    GOTD_IMSG_PACKIDX_FILE, PROC_GOTD, idxfd,
930 	    &ifile, sizeof(ifile)) == -1) {
931 		err = got_error_from_errno("imsg compose PACKIDX_FILE");
932 		idxfd = -1;
933 		goto done;
934 	}
935 	idxfd = -1;
936 
937 	memset(&ipack, 0, sizeof(ipack));
938 	ipack.client_id = client->id;
939 	if (client_has_capability(client, GOT_CAPA_REPORT_STATUS))
940 		ipack.report_status = 1;
941 
942 	if (gotd_imsg_compose_event(&client->repo_write->iev,
943 	    GOTD_IMSG_RECV_PACKFILE, PROC_GOTD, packfd,
944 	    &ipack, sizeof(ipack)) == -1) {
945 		err = got_error_from_errno("imsg compose RECV_PACKFILE");
946 		packfd = -1;
947 		goto done;
948 	}
949 	packfd = -1;
950 
951 done:
952 	free(basepath);
953 	if (pipe[0] != -1 && close(pipe[0]) == -1 && err == NULL)
954 		err = got_error_from_errno("close");
955 	if (pipe[1] != -1 && close(pipe[1]) == -1 && err == NULL)
956 		err = got_error_from_errno("close");
957 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
958 		err = got_error_from_errno("close");
959 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
960 		err = got_error_from_errno("close");
961 	if (err) {
962 		free(pack_path);
963 		free(idx_path);
964 	} else {
965 		client->packfile_path = pack_path;
966 		client->packidx_path = idx_path;
967 	}
968 	return err;
969 }
970 
971 static void
972 gotd_request(int fd, short events, void *arg)
973 {
974 	struct gotd_imsgev *iev = arg;
975 	struct imsgbuf *ibuf = &iev->ibuf;
976 	struct gotd_client *client = iev->handler_arg;
977 	const struct got_error *err = NULL;
978 	struct imsg imsg;
979 	ssize_t n;
980 
981 	if (events & EV_WRITE) {
982 		while (ibuf->w.queued) {
983 			n = msgbuf_write(&ibuf->w);
984 			if (n == -1 && errno == EPIPE) {
985 				/*
986 				 * The client has closed its socket.
987 				 * This can happen when Git clients are
988 				 * done sending pack file data.
989 				 */
990 				msgbuf_clear(&ibuf->w);
991 				continue;
992 			} else if (n == -1 && errno != EAGAIN) {
993 				err = got_error_from_errno("imsg_flush");
994 				disconnect_on_error(client, err);
995 				return;
996 			}
997 			if (n == 0) {
998 				/* Connection closed. */
999 				err = got_error(GOT_ERR_EOF);
1000 				disconnect_on_error(client, err);
1001 				return;
1002 			}
1003 		}
1004 
1005 		/* Disconnect gotctl(8) now that messages have been sent. */
1006 		if (!client_is_reading(client) && !client_is_writing(client)) {
1007 			disconnect(client);
1008 			return;
1009 		}
1010 	}
1011 
1012 	if ((events & EV_READ) == 0)
1013 		return;
1014 
1015 	memset(&imsg, 0, sizeof(imsg));
1016 
1017 	while (err == NULL) {
1018 		err = gotd_imsg_recv(&imsg, ibuf, 0);
1019 		if (err) {
1020 			if (err->code == GOT_ERR_PRIVSEP_READ)
1021 				err = NULL;
1022 			break;
1023 		}
1024 
1025 		evtimer_del(&client->tmo);
1026 
1027 		switch (imsg.hdr.type) {
1028 		case GOTD_IMSG_INFO:
1029 			err = send_info(client);
1030 			break;
1031 		case GOTD_IMSG_STOP:
1032 			err = stop_gotd(client);
1033 			break;
1034 		case GOTD_IMSG_LIST_REFS:
1035 			if (client->state != GOTD_STATE_EXPECT_LIST_REFS) {
1036 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1037 				    "unexpected list-refs request received");
1038 				break;
1039 			}
1040 			err = start_client_session(client, &imsg);
1041 			if (err)
1042 				break;
1043 			break;
1044 		case GOTD_IMSG_CAPABILITIES:
1045 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1046 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1047 				    "unexpected capabilities received");
1048 				break;
1049 			}
1050 			log_debug("receiving capabilities from uid %d",
1051 			    client->euid);
1052 			err = recv_capabilities(client, &imsg);
1053 			break;
1054 		case GOTD_IMSG_CAPABILITY:
1055 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1056 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1057 				    "unexpected capability received");
1058 				break;
1059 			}
1060 			err = recv_capability(client, &imsg);
1061 			if (err || client->ncapabilities < client->ncapa_alloc)
1062 				break;
1063 			if (client_is_reading(client)) {
1064 				client->state = GOTD_STATE_EXPECT_WANT;
1065 				log_debug("uid %d: expecting want-lines",
1066 				    client->euid);
1067 			} else if (client_is_writing(client)) {
1068 				client->state = GOTD_STATE_EXPECT_REF_UPDATE;
1069 				log_debug("uid %d: expecting ref-update-lines",
1070 				    client->euid);
1071 			} else
1072 				fatalx("client %d is both reading and writing",
1073 				    client->euid);
1074 			break;
1075 		case GOTD_IMSG_WANT:
1076 			if (client->state != GOTD_STATE_EXPECT_WANT) {
1077 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1078 				    "unexpected want-line received");
1079 				break;
1080 			}
1081 			log_debug("received want-line from uid %d",
1082 			    client->euid);
1083 			err = ensure_client_is_reading(client);
1084 			if (err)
1085 				break;
1086 			err = forward_want(client, &imsg);
1087 			break;
1088 		case GOTD_IMSG_REF_UPDATE:
1089 			if (client->state != GOTD_STATE_EXPECT_REF_UPDATE) {
1090 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1091 				    "unexpected ref-update-line received");
1092 				break;
1093 			}
1094 			log_debug("received ref-update-line from uid %d",
1095 			    client->euid);
1096 			err = ensure_client_is_writing(client);
1097 			if (err)
1098 				break;
1099 			err = forward_ref_update(client, &imsg);
1100 			if (err)
1101 				break;
1102 			client->state = GOTD_STATE_EXPECT_MORE_REF_UPDATES;
1103 			break;
1104 		case GOTD_IMSG_HAVE:
1105 			if (client->state != GOTD_STATE_EXPECT_HAVE) {
1106 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1107 				    "unexpected have-line received");
1108 				break;
1109 			}
1110 			log_debug("received have-line from uid %d",
1111 			    client->euid);
1112 			err = ensure_client_is_reading(client);
1113 			if (err)
1114 				break;
1115 			err = forward_have(client, &imsg);
1116 			if (err)
1117 				break;
1118 			break;
1119 		case GOTD_IMSG_FLUSH:
1120 			if (client->state == GOTD_STATE_EXPECT_WANT ||
1121 			    client->state == GOTD_STATE_EXPECT_HAVE) {
1122 				err = ensure_client_is_reading(client);
1123 				if (err)
1124 					break;
1125 			} else if (client->state ==
1126 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1127 				err = ensure_client_is_writing(client);
1128 				if (err)
1129 					break;
1130 			} else {
1131 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1132 				    "unexpected flush-pkt received");
1133 				break;
1134 			}
1135 			log_debug("received flush-pkt from uid %d",
1136 			    client->euid);
1137 			if (client->state == GOTD_STATE_EXPECT_WANT) {
1138 				client->state = GOTD_STATE_EXPECT_HAVE;
1139 				log_debug("uid %d: expecting have-lines",
1140 				    client->euid);
1141 			} else if (client->state == GOTD_STATE_EXPECT_HAVE) {
1142 				client->state = GOTD_STATE_EXPECT_DONE;
1143 				log_debug("uid %d: expecting 'done'",
1144 				    client->euid);
1145 			} else if (client->state ==
1146 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1147 				client->state = GOTD_STATE_EXPECT_PACKFILE;
1148 				log_debug("uid %d: expecting packfile",
1149 				    client->euid);
1150 				err = recv_packfile(client);
1151 			} else {
1152 				/* should not happen, see above */
1153 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1154 				    "unexpected client state");
1155 				break;
1156 			}
1157 			break;
1158 		case GOTD_IMSG_DONE:
1159 			if (client->state != GOTD_STATE_EXPECT_HAVE &&
1160 			    client->state != GOTD_STATE_EXPECT_DONE) {
1161 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1162 				    "unexpected flush-pkt received");
1163 				break;
1164 			}
1165 			log_debug("received 'done' from uid %d", client->euid);
1166 			err = ensure_client_is_reading(client);
1167 			if (err)
1168 				break;
1169 			client->state = GOTD_STATE_DONE;
1170 			err = send_packfile(client);
1171 			break;
1172 		default:
1173 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1174 			break;
1175 		}
1176 
1177 		imsg_free(&imsg);
1178 	}
1179 
1180 	if (err) {
1181 		if (err->code != GOT_ERR_EOF ||
1182 		    client->state != GOTD_STATE_EXPECT_PACKFILE)
1183 			disconnect_on_error(client, err);
1184 	} else {
1185 		gotd_imsg_event_add(&client->iev);
1186 		if (client->state == GOTD_STATE_EXPECT_LIST_REFS)
1187 			evtimer_add(&client->tmo, &auth_timeout);
1188 		else
1189 			evtimer_add(&client->tmo, &gotd.request_timeout);
1190 	}
1191 }
1192 
1193 static void
1194 gotd_request_timeout(int fd, short events, void *arg)
1195 {
1196 	struct gotd_client *client = arg;
1197 
1198 	log_debug("disconnecting uid %d due to timeout", client->euid);
1199 	disconnect(client);
1200 }
1201 
1202 static const struct got_error *
1203 recv_connect(uint32_t *client_id, struct imsg *imsg)
1204 {
1205 	const struct got_error *err = NULL;
1206 	struct gotd_imsg_connect iconnect;
1207 	size_t datalen;
1208 	int s = -1;
1209 	struct gotd_client *client = NULL;
1210 
1211 	*client_id = 0;
1212 
1213 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1214 	if (datalen != sizeof(iconnect))
1215 		return got_error(GOT_ERR_PRIVSEP_LEN);
1216 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
1217 
1218 	s = imsg->fd;
1219 	if (s == -1) {
1220 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
1221 		goto done;
1222 	}
1223 
1224 	if (find_client(iconnect.client_id)) {
1225 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
1226 		goto done;
1227 	}
1228 
1229 	client = calloc(1, sizeof(*client));
1230 	if (client == NULL) {
1231 		err = got_error_from_errno("calloc");
1232 		goto done;
1233 	}
1234 
1235 	*client_id = iconnect.client_id;
1236 
1237 	client->state = GOTD_STATE_EXPECT_LIST_REFS;
1238 	client->id = iconnect.client_id;
1239 	client->fd = s;
1240 	s = -1;
1241 	client->delta_cache_fd = -1;
1242 	/* The auth process will verify UID/GID for us. */
1243 	client->euid = iconnect.euid;
1244 	client->egid = iconnect.egid;
1245 	client->nref_updates = -1;
1246 
1247 	imsg_init(&client->iev.ibuf, client->fd);
1248 	client->iev.handler = gotd_request;
1249 	client->iev.events = EV_READ;
1250 	client->iev.handler_arg = client;
1251 
1252 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
1253 	    &client->iev);
1254 	gotd_imsg_event_add(&client->iev);
1255 
1256 	evtimer_set(&client->tmo, gotd_request_timeout, client);
1257 
1258 	add_client(client);
1259 	log_debug("%s: new client uid %d connected on fd %d", __func__,
1260 	    client->euid, client->fd);
1261 done:
1262 	if (err) {
1263 		struct gotd_child_proc *listen_proc = &gotd.listen_proc;
1264 		struct gotd_imsg_disconnect idisconnect;
1265 
1266 		idisconnect.client_id = client->id;
1267 		if (gotd_imsg_compose_event(&listen_proc->iev,
1268 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
1269 		    &idisconnect, sizeof(idisconnect)) == -1)
1270 			log_warn("imsg compose DISCONNECT");
1271 
1272 		if (s != -1)
1273 			close(s);
1274 	}
1275 
1276 	return err;
1277 }
1278 
1279 static const char *gotd_proc_names[PROC_MAX] = {
1280 	"parent",
1281 	"listen",
1282 	"auth",
1283 	"repo_read",
1284 	"repo_write"
1285 };
1286 
1287 static void
1288 kill_proc(struct gotd_child_proc *proc, int fatal)
1289 {
1290 	if (fatal) {
1291 		log_warnx("sending SIGKILL to PID %d", proc->pid);
1292 		kill(proc->pid, SIGKILL);
1293 	} else
1294 		kill(proc->pid, SIGTERM);
1295 }
1296 
1297 static void
1298 gotd_shutdown(void)
1299 {
1300 	struct gotd_child_proc *proc;
1301 	uint64_t slot;
1302 
1303 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
1304 		struct gotd_client *c, *tmp;
1305 
1306 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
1307 			disconnect(c);
1308 	}
1309 
1310 	proc = &gotd.listen_proc;
1311 	msgbuf_clear(&proc->iev.ibuf.w);
1312 	close(proc->iev.ibuf.fd);
1313 	kill_proc(proc, 0);
1314 	wait_for_child(proc->pid);
1315 
1316 	log_info("terminating");
1317 	exit(0);
1318 }
1319 
1320 void
1321 gotd_sighdlr(int sig, short event, void *arg)
1322 {
1323 	/*
1324 	 * Normal signal handler rules don't apply because libevent
1325 	 * decouples for us.
1326 	 */
1327 
1328 	switch (sig) {
1329 	case SIGHUP:
1330 		log_info("%s: ignoring SIGHUP", __func__);
1331 		break;
1332 	case SIGUSR1:
1333 		log_info("%s: ignoring SIGUSR1", __func__);
1334 		break;
1335 	case SIGTERM:
1336 	case SIGINT:
1337 		gotd_shutdown();
1338 		break;
1339 	default:
1340 		fatalx("unexpected signal");
1341 	}
1342 }
1343 
1344 static const struct got_error *
1345 ensure_proc_is_reading(struct gotd_client *client,
1346     struct gotd_child_proc *proc)
1347 {
1348 	if (!client_is_reading(client)) {
1349 		kill_proc(proc, 1);
1350 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1351 		    "PID %d handled a read-request for uid %d but this "
1352 		    "user is not reading from a repository", proc->pid,
1353 		    client->euid);
1354 	}
1355 
1356 	return NULL;
1357 }
1358 
1359 static const struct got_error *
1360 ensure_proc_is_writing(struct gotd_client *client,
1361     struct gotd_child_proc *proc)
1362 {
1363 	if (!client_is_writing(client)) {
1364 		kill_proc(proc, 1);
1365 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1366 		    "PID %d handled a write-request for uid %d but this "
1367 		    "user is not writing to a repository", proc->pid,
1368 		    client->euid);
1369 	}
1370 
1371 	return NULL;
1372 }
1373 
1374 static int
1375 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
1376     struct imsg *imsg)
1377 {
1378 	const struct got_error *err;
1379 	struct gotd_child_proc *client_proc;
1380 	int ret = 0;
1381 
1382 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
1383 		client_proc = get_client_proc(client);
1384 		if (client_proc == NULL)
1385 			fatalx("no process found for uid %d", client->euid);
1386 		if (proc->pid != client_proc->pid) {
1387 			kill_proc(proc, 1);
1388 			log_warnx("received message from PID %d for uid %d, "
1389 			    "while PID %d is the process serving this user",
1390 			    proc->pid, client->euid, client_proc->pid);
1391 			return 0;
1392 		}
1393 	}
1394 
1395 	switch (imsg->hdr.type) {
1396 	case GOTD_IMSG_ERROR:
1397 		ret = 1;
1398 		break;
1399 	case GOTD_IMSG_CONNECT:
1400 		if (proc->type != PROC_LISTEN) {
1401 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1402 			    "new connection for uid %d from PID %d "
1403 			    "which is not the listen process",
1404 			    proc->pid, client->euid);
1405 		} else
1406 			ret = 1;
1407 		break;
1408 	case GOTD_IMSG_ACCESS_GRANTED:
1409 		if (proc->type != PROC_AUTH) {
1410 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1411 			    "authentication of uid %d from PID %d "
1412 			    "which is not the auth process",
1413 			    proc->pid, client->euid);
1414 		} else
1415 			ret = 1;
1416 		break;
1417 	case GOTD_IMSG_REPO_CHILD_READY:
1418 		if (proc->type != PROC_REPO_READ &&
1419 		    proc->type != PROC_REPO_WRITE) {
1420 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1421 			    "unexpected \"ready\" signal from PID %d",
1422 			    proc->pid);
1423 		} else
1424 			ret = 1;
1425 		break;
1426 	case GOTD_IMSG_PACKFILE_DONE:
1427 		err = ensure_proc_is_reading(client, proc);
1428 		if (err)
1429 			log_warnx("uid %d: %s", client->euid, err->msg);
1430 		else
1431 			ret = 1;
1432 		break;
1433 	case GOTD_IMSG_PACKFILE_INSTALL:
1434 	case GOTD_IMSG_REF_UPDATES_START:
1435 	case GOTD_IMSG_REF_UPDATE:
1436 		err = ensure_proc_is_writing(client, proc);
1437 		if (err)
1438 			log_warnx("uid %d: %s", client->euid, err->msg);
1439 		else
1440 			ret = 1;
1441 		break;
1442 	default:
1443 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
1444 		break;
1445 	}
1446 
1447 	return ret;
1448 }
1449 
1450 static const struct got_error *
1451 list_refs_request(struct gotd_client *client, struct gotd_imsgev *iev)
1452 {
1453 	static const struct got_error *err;
1454 	struct gotd_imsg_list_refs_internal ilref;
1455 	int fd;
1456 
1457 	memset(&ilref, 0, sizeof(ilref));
1458 	ilref.client_id = client->id;
1459 
1460 	fd = dup(client->fd);
1461 	if (fd == -1)
1462 		return got_error_from_errno("dup");
1463 
1464 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_LIST_REFS_INTERNAL,
1465 	    PROC_GOTD, fd, &ilref, sizeof(ilref)) == -1) {
1466 		err = got_error_from_errno("imsg compose WANT");
1467 		close(fd);
1468 		return err;
1469 	}
1470 
1471 	client->state = GOTD_STATE_EXPECT_CAPABILITIES;
1472 	log_debug("uid %d: expecting capabilities", client->euid);
1473 	return NULL;
1474 }
1475 
1476 static const struct got_error *
1477 recv_packfile_done(uint32_t *client_id, struct imsg *imsg)
1478 {
1479 	struct gotd_imsg_packfile_done idone;
1480 	size_t datalen;
1481 
1482 	log_debug("packfile-done received");
1483 
1484 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1485 	if (datalen != sizeof(idone))
1486 		return got_error(GOT_ERR_PRIVSEP_LEN);
1487 	memcpy(&idone, imsg->data, sizeof(idone));
1488 
1489 	*client_id = idone.client_id;
1490 	return NULL;
1491 }
1492 
1493 static const struct got_error *
1494 recv_packfile_install(uint32_t *client_id, struct imsg *imsg)
1495 {
1496 	struct gotd_imsg_packfile_install inst;
1497 	size_t datalen;
1498 
1499 	log_debug("packfile-install received");
1500 
1501 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1502 	if (datalen != sizeof(inst))
1503 		return got_error(GOT_ERR_PRIVSEP_LEN);
1504 	memcpy(&inst, imsg->data, sizeof(inst));
1505 
1506 	*client_id = inst.client_id;
1507 	return NULL;
1508 }
1509 
1510 static const struct got_error *
1511 recv_ref_updates_start(uint32_t *client_id, struct imsg *imsg)
1512 {
1513 	struct gotd_imsg_ref_updates_start istart;
1514 	size_t datalen;
1515 
1516 	log_debug("ref-updates-start received");
1517 
1518 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1519 	if (datalen != sizeof(istart))
1520 		return got_error(GOT_ERR_PRIVSEP_LEN);
1521 	memcpy(&istart, imsg->data, sizeof(istart));
1522 
1523 	*client_id = istart.client_id;
1524 	return NULL;
1525 }
1526 
1527 static const struct got_error *
1528 recv_ref_update(uint32_t *client_id, struct imsg *imsg)
1529 {
1530 	struct gotd_imsg_ref_update iref;
1531 	size_t datalen;
1532 
1533 	log_debug("ref-update received");
1534 
1535 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1536 	if (datalen < sizeof(iref))
1537 		return got_error(GOT_ERR_PRIVSEP_LEN);
1538 	memcpy(&iref, imsg->data, sizeof(iref));
1539 
1540 	*client_id = iref.client_id;
1541 	return NULL;
1542 }
1543 
1544 static const struct got_error *
1545 send_ref_update_ok(struct gotd_client *client,
1546     struct gotd_imsg_ref_update *iref, const char *refname)
1547 {
1548 	struct gotd_imsg_ref_update_ok iok;
1549 	struct ibuf *wbuf;
1550 	size_t len;
1551 
1552 	memset(&iok, 0, sizeof(iok));
1553 	iok.client_id = client->id;
1554 	memcpy(iok.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1555 	memcpy(iok.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1556 	iok.name_len = strlen(refname);
1557 
1558 	len = sizeof(iok) + iok.name_len;
1559 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_OK,
1560 	    PROC_GOTD, gotd.pid, len);
1561 	if (wbuf == NULL)
1562 		return got_error_from_errno("imsg_create REF_UPDATE_OK");
1563 
1564 	if (imsg_add(wbuf, &iok, sizeof(iok)) == -1)
1565 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1566 	if (imsg_add(wbuf, refname, iok.name_len) == -1)
1567 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1568 
1569 	wbuf->fd = -1;
1570 	imsg_close(&client->iev.ibuf, wbuf);
1571 	gotd_imsg_event_add(&client->iev);
1572 	return NULL;
1573 }
1574 
1575 static void
1576 send_refs_updated(struct gotd_client *client)
1577 {
1578 	if (gotd_imsg_compose_event(&client->iev,
1579 	    GOTD_IMSG_REFS_UPDATED, PROC_GOTD, -1, NULL, 0) == -1)
1580 		log_warn("imsg compose REFS_UPDATED");
1581 }
1582 
1583 static const struct got_error *
1584 send_ref_update_ng(struct gotd_client *client,
1585     struct gotd_imsg_ref_update *iref, const char *refname,
1586     const char *reason)
1587 {
1588 	const struct got_error *ng_err;
1589 	struct gotd_imsg_ref_update_ng ing;
1590 	struct ibuf *wbuf;
1591 	size_t len;
1592 
1593 	memset(&ing, 0, sizeof(ing));
1594 	ing.client_id = client->id;
1595 	memcpy(ing.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1596 	memcpy(ing.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1597 	ing.name_len = strlen(refname);
1598 
1599 	ng_err = got_error_fmt(GOT_ERR_REF_BUSY, "%s", reason);
1600 	ing.reason_len = strlen(ng_err->msg);
1601 
1602 	len = sizeof(ing) + ing.name_len + ing.reason_len;
1603 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_NG,
1604 	    PROC_GOTD, gotd.pid, len);
1605 	if (wbuf == NULL)
1606 		return got_error_from_errno("imsg_create REF_UPDATE_NG");
1607 
1608 	if (imsg_add(wbuf, &ing, sizeof(ing)) == -1)
1609 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1610 	if (imsg_add(wbuf, refname, ing.name_len) == -1)
1611 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1612 	if (imsg_add(wbuf, ng_err->msg, ing.reason_len) == -1)
1613 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1614 
1615 	wbuf->fd = -1;
1616 	imsg_close(&client->iev.ibuf, wbuf);
1617 	gotd_imsg_event_add(&client->iev);
1618 	return NULL;
1619 }
1620 
1621 static const struct got_error *
1622 install_pack(struct gotd_client *client, const char *repo_path,
1623     struct imsg *imsg)
1624 {
1625 	const struct got_error *err = NULL;
1626 	struct gotd_imsg_packfile_install inst;
1627 	char hex[SHA1_DIGEST_STRING_LENGTH];
1628 	size_t datalen;
1629 	char *packfile_path = NULL, *packidx_path = NULL;
1630 
1631 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1632 	if (datalen != sizeof(inst))
1633 		return got_error(GOT_ERR_PRIVSEP_LEN);
1634 	memcpy(&inst, imsg->data, sizeof(inst));
1635 
1636 	if (client->packfile_path == NULL)
1637 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1638 		    "client has no pack file");
1639 	if (client->packidx_path == NULL)
1640 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1641 		    "client has no pack file index");
1642 
1643 	if (got_sha1_digest_to_str(inst.pack_sha1, hex, sizeof(hex)) == NULL)
1644 		return got_error_msg(GOT_ERR_NO_SPACE,
1645 		    "could not convert pack file SHA1 to hex");
1646 
1647 	if (asprintf(&packfile_path, "/%s/%s/pack-%s.pack",
1648 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1649 		err = got_error_from_errno("asprintf");
1650 		goto done;
1651 	}
1652 
1653 	if (asprintf(&packidx_path, "/%s/%s/pack-%s.idx",
1654 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1655 		err = got_error_from_errno("asprintf");
1656 		goto done;
1657 	}
1658 
1659 	if (rename(client->packfile_path, packfile_path) == -1) {
1660 		err = got_error_from_errno3("rename", client->packfile_path,
1661 		    packfile_path);
1662 		goto done;
1663 	}
1664 
1665 	free(client->packfile_path);
1666 	client->packfile_path = NULL;
1667 
1668 	if (rename(client->packidx_path, packidx_path) == -1) {
1669 		err = got_error_from_errno3("rename", client->packidx_path,
1670 		    packidx_path);
1671 		goto done;
1672 	}
1673 
1674 	free(client->packidx_path);
1675 	client->packidx_path = NULL;
1676 done:
1677 	free(packfile_path);
1678 	free(packidx_path);
1679 	return err;
1680 }
1681 
1682 static const struct got_error *
1683 begin_ref_updates(struct gotd_client *client, struct imsg *imsg)
1684 {
1685 	struct gotd_imsg_ref_updates_start istart;
1686 	size_t datalen;
1687 
1688 	if (client->nref_updates != -1)
1689 		return got_error(GOT_ERR_PRIVSEP_MSG);
1690 
1691 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1692 	if (datalen != sizeof(istart))
1693 		return got_error(GOT_ERR_PRIVSEP_LEN);
1694 	memcpy(&istart, imsg->data, sizeof(istart));
1695 
1696 	if (istart.nref_updates <= 0)
1697 		return got_error(GOT_ERR_PRIVSEP_MSG);
1698 
1699 	client->nref_updates = istart.nref_updates;
1700 	return NULL;
1701 }
1702 
1703 static const struct got_error *
1704 update_ref(struct gotd_client *client, const char *repo_path,
1705     struct imsg *imsg)
1706 {
1707 	const struct got_error *err = NULL;
1708 	struct got_repository *repo = NULL;
1709 	struct got_reference *ref = NULL;
1710 	struct gotd_imsg_ref_update iref;
1711 	struct got_object_id old_id, new_id;
1712 	struct got_object_id *id = NULL;
1713 	struct got_object *obj = NULL;
1714 	char *refname = NULL;
1715 	size_t datalen;
1716 	int locked = 0;
1717 
1718 	log_debug("update-ref from uid %d", client->euid);
1719 
1720 	if (client->nref_updates <= 0)
1721 		return got_error(GOT_ERR_PRIVSEP_MSG);
1722 
1723 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1724 	if (datalen < sizeof(iref))
1725 		return got_error(GOT_ERR_PRIVSEP_LEN);
1726 	memcpy(&iref, imsg->data, sizeof(iref));
1727 	if (datalen != sizeof(iref) + iref.name_len)
1728 		return got_error(GOT_ERR_PRIVSEP_LEN);
1729 	refname = malloc(iref.name_len + 1);
1730 	if (refname == NULL)
1731 		return got_error_from_errno("malloc");
1732 	memcpy(refname, imsg->data + sizeof(iref), iref.name_len);
1733 	refname[iref.name_len] = '\0';
1734 
1735 	log_debug("updating ref %s for uid %d", refname, client->euid);
1736 
1737 	err = got_repo_open(&repo, repo_path, NULL, NULL);
1738 	if (err)
1739 		goto done;
1740 
1741 	memcpy(old_id.sha1, iref.old_id, SHA1_DIGEST_LENGTH);
1742 	memcpy(new_id.sha1, iref.new_id, SHA1_DIGEST_LENGTH);
1743 	err = got_object_open(&obj, repo, &new_id);
1744 	if (err)
1745 		goto done;
1746 
1747 	if (iref.ref_is_new) {
1748 		err = got_ref_open(&ref, repo, refname, 0);
1749 		if (err) {
1750 			if (err->code != GOT_ERR_NOT_REF)
1751 				goto done;
1752 			err = got_ref_alloc(&ref, refname, &new_id);
1753 			if (err)
1754 				goto done;
1755 			err = got_ref_write(ref, repo); /* will lock/unlock */
1756 			if (err)
1757 				goto done;
1758 		} else {
1759 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1760 			    "%s has been created by someone else "
1761 			    "while transaction was in progress",
1762 			    got_ref_get_name(ref));
1763 			goto done;
1764 		}
1765 	} else {
1766 		err = got_ref_open(&ref, repo, refname, 1 /* lock */);
1767 		if (err)
1768 			goto done;
1769 		locked = 1;
1770 
1771 		err = got_ref_resolve(&id, repo, ref);
1772 		if (err)
1773 			goto done;
1774 
1775 		if (got_object_id_cmp(id, &old_id) != 0) {
1776 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1777 			    "%s has been modified by someone else "
1778 			    "while transaction was in progress",
1779 			    got_ref_get_name(ref));
1780 			goto done;
1781 		}
1782 
1783 		err = got_ref_change_ref(ref, &new_id);
1784 		if (err)
1785 			goto done;
1786 
1787 		err = got_ref_write(ref, repo);
1788 		if (err)
1789 			goto done;
1790 
1791 		free(id);
1792 		id = NULL;
1793 	}
1794 done:
1795 	if (err) {
1796 		if (err->code == GOT_ERR_LOCKFILE_TIMEOUT) {
1797 			err = got_error_fmt(GOT_ERR_LOCKFILE_TIMEOUT,
1798 			    "could not acquire exclusive file lock for %s",
1799 			    refname);
1800 		}
1801 		send_ref_update_ng(client, &iref, refname, err->msg);
1802 	} else
1803 		send_ref_update_ok(client, &iref, refname);
1804 
1805 	if (client->nref_updates > 0) {
1806 		client->nref_updates--;
1807 		if (client->nref_updates == 0)
1808 			send_refs_updated(client);
1809 
1810 	}
1811 	if (locked) {
1812 		const struct got_error *unlock_err;
1813 		unlock_err = got_ref_unlock(ref);
1814 		if (unlock_err && err == NULL)
1815 			err = unlock_err;
1816 	}
1817 	if (ref)
1818 		got_ref_close(ref);
1819 	if (obj)
1820 		got_object_close(obj);
1821 	if (repo)
1822 		got_repo_close(repo);
1823 	free(refname);
1824 	free(id);
1825 	return err;
1826 }
1827 
1828 static void
1829 gotd_dispatch_listener(int fd, short event, void *arg)
1830 {
1831 	struct gotd_imsgev *iev = arg;
1832 	struct imsgbuf *ibuf = &iev->ibuf;
1833 	struct gotd_child_proc *proc = &gotd.listen_proc;
1834 	ssize_t n;
1835 	int shut = 0;
1836 	struct imsg imsg;
1837 
1838 	if (proc->iev.ibuf.fd != fd)
1839 		fatalx("%s: unexpected fd %d", __func__, fd);
1840 
1841 	if (event & EV_READ) {
1842 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1843 			fatal("imsg_read error");
1844 		if (n == 0) {
1845 			/* Connection closed. */
1846 			shut = 1;
1847 			goto done;
1848 		}
1849 	}
1850 
1851 	if (event & EV_WRITE) {
1852 		n = msgbuf_write(&ibuf->w);
1853 		if (n == -1 && errno != EAGAIN)
1854 			fatal("msgbuf_write");
1855 		if (n == 0) {
1856 			/* Connection closed. */
1857 			shut = 1;
1858 			goto done;
1859 		}
1860 	}
1861 
1862 	for (;;) {
1863 		const struct got_error *err = NULL;
1864 		struct gotd_client *client = NULL;
1865 		uint32_t client_id = 0;
1866 		int do_disconnect = 0;
1867 
1868 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1869 			fatal("%s: imsg_get error", __func__);
1870 		if (n == 0)	/* No more messages. */
1871 			break;
1872 
1873 		switch (imsg.hdr.type) {
1874 		case GOTD_IMSG_ERROR:
1875 			do_disconnect = 1;
1876 			err = gotd_imsg_recv_error(&client_id, &imsg);
1877 			break;
1878 		case GOTD_IMSG_CONNECT:
1879 			err = recv_connect(&client_id, &imsg);
1880 			break;
1881 		default:
1882 			log_debug("unexpected imsg %d", imsg.hdr.type);
1883 			break;
1884 		}
1885 
1886 		client = find_client(client_id);
1887 		if (client == NULL) {
1888 			log_warnx("%s: client not found", __func__);
1889 			imsg_free(&imsg);
1890 			continue;
1891 		}
1892 
1893 		if (err)
1894 			log_warnx("uid %d: %s", client->euid, err->msg);
1895 
1896 		if (do_disconnect) {
1897 			if (err)
1898 				disconnect_on_error(client, err);
1899 			else
1900 				disconnect(client);
1901 		}
1902 
1903 		imsg_free(&imsg);
1904 	}
1905 done:
1906 	if (!shut) {
1907 		gotd_imsg_event_add(iev);
1908 	} else {
1909 		/* This pipe is dead. Remove its event handler */
1910 		event_del(&iev->ev);
1911 		event_loopexit(NULL);
1912 	}
1913 }
1914 
1915 static void
1916 gotd_dispatch_auth_child(int fd, short event, void *arg)
1917 {
1918 	const struct got_error *err = NULL;
1919 	struct gotd_imsgev *iev = arg;
1920 	struct imsgbuf *ibuf = &iev->ibuf;
1921 	struct gotd_client *client;
1922 	struct gotd_repo *repo = NULL;
1923 	ssize_t n;
1924 	int shut = 0;
1925 	struct imsg imsg;
1926 	uint32_t client_id = 0;
1927 	int do_disconnect = 0;
1928 	enum gotd_procid proc_type;
1929 
1930 	client = find_client_by_proc_fd(fd);
1931 	if (client == NULL)
1932 		fatalx("cannot find client for fd %d", fd);
1933 
1934 	if (client->auth == NULL)
1935 		fatalx("cannot find auth child process for fd %d", fd);
1936 
1937 	if (event & EV_READ) {
1938 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1939 			fatal("imsg_read error");
1940 		if (n == 0) {
1941 			/* Connection closed. */
1942 			shut = 1;
1943 			goto done;
1944 		}
1945 	}
1946 
1947 	if (event & EV_WRITE) {
1948 		n = msgbuf_write(&ibuf->w);
1949 		if (n == -1 && errno != EAGAIN)
1950 			fatal("msgbuf_write");
1951 		if (n == 0) {
1952 			/* Connection closed. */
1953 			shut = 1;
1954 		}
1955 		goto done;
1956 	}
1957 
1958 	if (client->auth->iev.ibuf.fd != fd)
1959 		fatalx("%s: unexpected fd %d", __func__, fd);
1960 
1961 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1962 		fatal("%s: imsg_get error", __func__);
1963 	if (n == 0)	/* No more messages. */
1964 		return;
1965 
1966 	evtimer_del(&client->tmo);
1967 
1968 	switch (imsg.hdr.type) {
1969 	case GOTD_IMSG_ERROR:
1970 		do_disconnect = 1;
1971 		err = gotd_imsg_recv_error(&client_id, &imsg);
1972 		break;
1973 	case GOTD_IMSG_ACCESS_GRANTED:
1974 		break;
1975 	default:
1976 		do_disconnect = 1;
1977 		log_debug("unexpected imsg %d", imsg.hdr.type);
1978 		break;
1979 	}
1980 
1981 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1982 		do_disconnect = 1;
1983 		log_debug("dropping imsg type %d from PID %d",
1984 		    imsg.hdr.type, client->auth->pid);
1985 	}
1986 	imsg_free(&imsg);
1987 
1988 	if (do_disconnect) {
1989 		if (err)
1990 			disconnect_on_error(client, err);
1991 		else
1992 			disconnect(client);
1993 		goto done;
1994 	}
1995 
1996 	repo = find_repo_by_name(client->auth->repo_name);
1997 	if (repo == NULL) {
1998 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1999 		goto done;
2000 	}
2001 	kill_auth_proc(client);
2002 
2003 	log_info("authenticated uid %d for repository %s\n",
2004 	    client->euid, repo->name);
2005 
2006 	if (client->required_auth & GOTD_AUTH_WRITE)
2007 		proc_type = PROC_REPO_WRITE;
2008 	else
2009 		proc_type = PROC_REPO_READ;
2010 
2011 	err = start_repo_child(client, proc_type, repo, gotd.argv0,
2012 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
2013 done:
2014 	if (err)
2015 		log_warnx("uid %d: %s", client->euid, err->msg);
2016 
2017 	/* We might have killed the auth process by now. */
2018 	if (client->auth != NULL) {
2019 		if (!shut) {
2020 			gotd_imsg_event_add(iev);
2021 		} else {
2022 			/* This pipe is dead. Remove its event handler */
2023 			event_del(&iev->ev);
2024 		}
2025 	}
2026 }
2027 
2028 static void
2029 gotd_dispatch_repo_child(int fd, short event, void *arg)
2030 {
2031 	struct gotd_imsgev *iev = arg;
2032 	struct imsgbuf *ibuf = &iev->ibuf;
2033 	struct gotd_child_proc *proc = NULL;
2034 	struct gotd_client *client = NULL;
2035 	ssize_t n;
2036 	int shut = 0;
2037 	struct imsg imsg;
2038 
2039 	if (event & EV_READ) {
2040 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
2041 			fatal("imsg_read error");
2042 		if (n == 0) {
2043 			/* Connection closed. */
2044 			shut = 1;
2045 			goto done;
2046 		}
2047 	}
2048 
2049 	if (event & EV_WRITE) {
2050 		n = msgbuf_write(&ibuf->w);
2051 		if (n == -1 && errno != EAGAIN)
2052 			fatal("msgbuf_write");
2053 		if (n == 0) {
2054 			/* Connection closed. */
2055 			shut = 1;
2056 			goto done;
2057 		}
2058 	}
2059 
2060 	client = find_client_by_proc_fd(fd);
2061 	if (client == NULL)
2062 		fatalx("cannot find client for fd %d", fd);
2063 
2064 	proc = get_client_proc(client);
2065 	if (proc == NULL)
2066 		fatalx("cannot find child process for fd %d", fd);
2067 
2068 	for (;;) {
2069 		const struct got_error *err = NULL;
2070 		uint32_t client_id = 0;
2071 		int do_disconnect = 0;
2072 		int do_list_refs = 0, do_ref_updates = 0, do_ref_update = 0;
2073 		int do_packfile_install = 0;
2074 
2075 		if ((n = imsg_get(ibuf, &imsg)) == -1)
2076 			fatal("%s: imsg_get error", __func__);
2077 		if (n == 0)	/* No more messages. */
2078 			break;
2079 
2080 		switch (imsg.hdr.type) {
2081 		case GOTD_IMSG_ERROR:
2082 			do_disconnect = 1;
2083 			err = gotd_imsg_recv_error(&client_id, &imsg);
2084 			break;
2085 		case GOTD_IMSG_REPO_CHILD_READY:
2086 			do_list_refs = 1;
2087 			break;
2088 		case GOTD_IMSG_PACKFILE_DONE:
2089 			do_disconnect = 1;
2090 			err = recv_packfile_done(&client_id, &imsg);
2091 			break;
2092 		case GOTD_IMSG_PACKFILE_INSTALL:
2093 			err = recv_packfile_install(&client_id, &imsg);
2094 			if (err == NULL)
2095 				do_packfile_install = 1;
2096 			break;
2097 		case GOTD_IMSG_REF_UPDATES_START:
2098 			err = recv_ref_updates_start(&client_id, &imsg);
2099 			if (err == NULL)
2100 				do_ref_updates = 1;
2101 			break;
2102 		case GOTD_IMSG_REF_UPDATE:
2103 			err = recv_ref_update(&client_id, &imsg);
2104 			if (err == NULL)
2105 				do_ref_update = 1;
2106 			break;
2107 		default:
2108 			log_debug("unexpected imsg %d", imsg.hdr.type);
2109 			break;
2110 		}
2111 
2112 		if (!verify_imsg_src(client, proc, &imsg)) {
2113 			log_debug("dropping imsg type %d from PID %d",
2114 			    imsg.hdr.type, proc->pid);
2115 			imsg_free(&imsg);
2116 			continue;
2117 		}
2118 		if (err)
2119 			log_warnx("uid %d: %s", client->euid, err->msg);
2120 
2121 		if (do_disconnect) {
2122 			if (err)
2123 				disconnect_on_error(client, err);
2124 			else
2125 				disconnect(client);
2126 		} else {
2127 			if (do_list_refs)
2128 				err = list_refs_request(client, iev);
2129 			else if (do_packfile_install)
2130 				err = install_pack(client, proc->repo_path,
2131 				    &imsg);
2132 			else if (do_ref_updates)
2133 				err = begin_ref_updates(client, &imsg);
2134 			else if (do_ref_update)
2135 				err = update_ref(client, proc->repo_path,
2136 				    &imsg);
2137 			if (err)
2138 				log_warnx("uid %d: %s", client->euid, err->msg);
2139 		}
2140 		imsg_free(&imsg);
2141 	}
2142 done:
2143 	if (!shut) {
2144 		gotd_imsg_event_add(iev);
2145 	} else {
2146 		/* This pipe is dead. Remove its event handler */
2147 		event_del(&iev->ev);
2148 		event_loopexit(NULL);
2149 	}
2150 }
2151 
2152 static pid_t
2153 start_child(enum gotd_procid proc_id, const char *repo_path,
2154     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
2155 {
2156 	char	*argv[11];
2157 	int	 argc = 0;
2158 	pid_t	 pid;
2159 
2160 	switch (pid = fork()) {
2161 	case -1:
2162 		fatal("cannot fork");
2163 	case 0:
2164 		break;
2165 	default:
2166 		close(fd);
2167 		return pid;
2168 	}
2169 
2170 	if (fd != GOTD_FILENO_MSG_PIPE) {
2171 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
2172 			fatal("cannot setup imsg fd");
2173 	} else if (fcntl(fd, F_SETFD, 0) == -1)
2174 		fatal("cannot setup imsg fd");
2175 
2176 	argv[argc++] = argv0;
2177 	switch (proc_id) {
2178 	case PROC_LISTEN:
2179 		argv[argc++] = (char *)"-L";
2180 		break;
2181 	case PROC_AUTH:
2182 		argv[argc++] = (char *)"-A";
2183 		break;
2184 	case PROC_REPO_READ:
2185 		argv[argc++] = (char *)"-R";
2186 		break;
2187 	case PROC_REPO_WRITE:
2188 		argv[argc++] = (char *)"-W";
2189 		break;
2190 	default:
2191 		fatalx("invalid process id %d", proc_id);
2192 	}
2193 
2194 	argv[argc++] = (char *)"-f";
2195 	argv[argc++] = (char *)confpath;
2196 
2197 	if (repo_path) {
2198 		argv[argc++] = (char *)"-P";
2199 		argv[argc++] = (char *)repo_path;
2200 	}
2201 
2202 	if (!daemonize)
2203 		argv[argc++] = (char *)"-d";
2204 	if (verbosity > 0)
2205 		argv[argc++] = (char *)"-v";
2206 	if (verbosity > 1)
2207 		argv[argc++] = (char *)"-v";
2208 	argv[argc++] = NULL;
2209 
2210 	execvp(argv0, argv);
2211 	fatal("execvp");
2212 }
2213 
2214 static void
2215 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
2216 {
2217 	struct gotd_child_proc *proc = &gotd.listen_proc;
2218 
2219 	proc->type = PROC_LISTEN;
2220 
2221 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2222 	    PF_UNSPEC, proc->pipe) == -1)
2223 		fatal("socketpair");
2224 
2225 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
2226 	    proc->pipe[1], daemonize, verbosity);
2227 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2228 	proc->iev.handler = gotd_dispatch_listener;
2229 	proc->iev.events = EV_READ;
2230 	proc->iev.handler_arg = NULL;
2231 }
2232 
2233 static const struct got_error *
2234 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
2235     struct gotd_repo *repo, char *argv0, const char *confpath,
2236     int daemonize, int verbosity)
2237 {
2238 	struct gotd_child_proc *proc;
2239 
2240 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
2241 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
2242 
2243 	proc = calloc(1, sizeof(*proc));
2244 	if (proc == NULL)
2245 		return got_error_from_errno("calloc");
2246 
2247 	proc->type = proc_type;
2248 	if (strlcpy(proc->repo_name, repo->name,
2249 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2250 		fatalx("repository name too long: %s", repo->name);
2251 	log_debug("starting %s for repository %s",
2252 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
2253 	if (realpath(repo->path, proc->repo_path) == NULL)
2254 		fatal("%s", repo->path);
2255 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2256 	    PF_UNSPEC, proc->pipe) == -1)
2257 		fatal("socketpair");
2258 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2259 	    confpath, proc->pipe[1], daemonize, verbosity);
2260 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2261 	log_debug("proc %s %s is on fd %d",
2262 	    gotd_proc_names[proc->type], proc->repo_path,
2263 	    proc->pipe[0]);
2264 	proc->iev.handler = gotd_dispatch_repo_child;
2265 	proc->iev.events = EV_READ;
2266 	proc->iev.handler_arg = NULL;
2267 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2268 	    gotd_dispatch_repo_child, &proc->iev);
2269 	gotd_imsg_event_add(&proc->iev);
2270 
2271 	if (proc->type == PROC_REPO_READ)
2272 		client->repo_read = proc;
2273 	else
2274 		client->repo_write = proc;
2275 
2276 	return NULL;
2277 }
2278 
2279 static const struct got_error *
2280 start_auth_child(struct gotd_client *client, int required_auth,
2281     struct gotd_repo *repo, char *argv0, const char *confpath,
2282     int daemonize, int verbosity)
2283 {
2284 	const struct got_error *err = NULL;
2285 	struct gotd_child_proc *proc;
2286 	struct gotd_imsg_auth iauth;
2287 	int fd;
2288 
2289 	memset(&iauth, 0, sizeof(iauth));
2290 
2291 	fd = dup(client->fd);
2292 	if (fd == -1)
2293 		return got_error_from_errno("dup");
2294 
2295 	proc = calloc(1, sizeof(*proc));
2296 	if (proc == NULL) {
2297 		err = got_error_from_errno("calloc");
2298 		close(fd);
2299 		return err;
2300 	}
2301 
2302 	proc->type = PROC_AUTH;
2303 	if (strlcpy(proc->repo_name, repo->name,
2304 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2305 		fatalx("repository name too long: %s", repo->name);
2306 	log_debug("starting auth for uid %d repository %s",
2307 	    client->euid, repo->name);
2308 	if (realpath(repo->path, proc->repo_path) == NULL)
2309 		fatal("%s", repo->path);
2310 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2311 	    PF_UNSPEC, proc->pipe) == -1)
2312 		fatal("socketpair");
2313 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2314 	    confpath, proc->pipe[1], daemonize, verbosity);
2315 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2316 	log_debug("proc %s %s is on fd %d",
2317 	    gotd_proc_names[proc->type], proc->repo_path,
2318 	    proc->pipe[0]);
2319 	proc->iev.handler = gotd_dispatch_auth_child;
2320 	proc->iev.events = EV_READ;
2321 	proc->iev.handler_arg = NULL;
2322 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2323 	    gotd_dispatch_auth_child, &proc->iev);
2324 	gotd_imsg_event_add(&proc->iev);
2325 
2326 	iauth.euid = client->euid;
2327 	iauth.egid = client->egid;
2328 	iauth.required_auth = required_auth;
2329 	iauth.client_id = client->id;
2330 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
2331 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
2332 		log_warn("imsg compose AUTHENTICATE");
2333 		close(fd);
2334 		/* Let the auth_timeout handler tidy up. */
2335 	}
2336 
2337 	client->auth = proc;
2338 	client->required_auth = required_auth;
2339 	return NULL;
2340 }
2341 
2342 static void
2343 apply_unveil_repo_readonly(const char *repo_path)
2344 {
2345 	if (unveil(repo_path, "r") == -1)
2346 		fatal("unveil %s", repo_path);
2347 
2348 	if (unveil(NULL, NULL) == -1)
2349 		fatal("unveil");
2350 }
2351 
2352 static void
2353 apply_unveil_none(void)
2354 {
2355 	if (unveil("/", "") == -1)
2356 		fatal("unveil");
2357 
2358 	if (unveil(NULL, NULL) == -1)
2359 		fatal("unveil");
2360 }
2361 
2362 static void
2363 apply_unveil(void)
2364 {
2365 	struct gotd_repo *repo;
2366 
2367 	if (unveil(gotd.argv0, "x") == -1)
2368 		fatal("unveil %s", gotd.argv0);
2369 
2370 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
2371 		if (unveil(repo->path, "rwc") == -1)
2372 			fatal("unveil %s", repo->path);
2373 	}
2374 
2375 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
2376 		fatal("unveil %s", GOT_TMPDIR_STR);
2377 
2378 	if (unveil(NULL, NULL) == -1)
2379 		fatal("unveil");
2380 }
2381 
2382 int
2383 main(int argc, char **argv)
2384 {
2385 	const struct got_error *error = NULL;
2386 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
2387 	const char *confpath = GOTD_CONF_PATH;
2388 	char *argv0 = argv[0];
2389 	char title[2048];
2390 	struct passwd *pw = NULL;
2391 	char *repo_path = NULL;
2392 	enum gotd_procid proc_id = PROC_GOTD;
2393 	struct event evsigint, evsigterm, evsighup, evsigusr1;
2394 	int *pack_fds = NULL, *temp_fds = NULL;
2395 
2396 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
2397 
2398 	while ((ch = getopt(argc, argv, "Adf:LnP:RvW")) != -1) {
2399 		switch (ch) {
2400 		case 'A':
2401 			proc_id = PROC_AUTH;
2402 			break;
2403 		case 'd':
2404 			daemonize = 0;
2405 			break;
2406 		case 'f':
2407 			confpath = optarg;
2408 			break;
2409 		case 'L':
2410 			proc_id = PROC_LISTEN;
2411 			break;
2412 		case 'n':
2413 			noaction = 1;
2414 			break;
2415 		case 'P':
2416 			repo_path = realpath(optarg, NULL);
2417 			if (repo_path == NULL)
2418 				fatal("realpath '%s'", optarg);
2419 			break;
2420 		case 'R':
2421 			proc_id = PROC_REPO_READ;
2422 			break;
2423 		case 'v':
2424 			if (verbosity < 3)
2425 				verbosity++;
2426 			break;
2427 		case 'W':
2428 			proc_id = PROC_REPO_WRITE;
2429 			break;
2430 		default:
2431 			usage();
2432 		}
2433 	}
2434 
2435 	argc -= optind;
2436 	argv += optind;
2437 
2438 	if (argc != 0)
2439 		usage();
2440 
2441 	/* Require an absolute path in argv[0] for reliable re-exec. */
2442 	if (!got_path_is_absolute(argv0))
2443 		fatalx("bad path \"%s\": must be an absolute path", argv0);
2444 
2445 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
2446 		fatalx("need root privileges");
2447 
2448 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
2449 	log_setverbose(verbosity);
2450 
2451 	if (parse_config(confpath, proc_id, &gotd) != 0)
2452 		return 1;
2453 
2454 	gotd.argv0 = argv0;
2455 	gotd.daemonize = daemonize;
2456 	gotd.verbosity = verbosity;
2457 	gotd.confpath = confpath;
2458 
2459 	if (proc_id == PROC_GOTD &&
2460 	    (gotd.nrepos == 0 || TAILQ_EMPTY(&gotd.repos)))
2461 		fatalx("no repository defined in configuration file");
2462 
2463 	pw = getpwnam(gotd.user_name);
2464 	if (pw == NULL)
2465 		fatalx("user %s not found", gotd.user_name);
2466 
2467 	if (pw->pw_uid == 0) {
2468 		fatalx("cannot run %s as %s: the user running %s "
2469 		    "must not be the superuser",
2470 		    getprogname(), pw->pw_name, getprogname());
2471 	}
2472 
2473 	if (proc_id == PROC_LISTEN &&
2474 	    !got_path_is_absolute(gotd.unix_socket_path))
2475 		fatalx("bad unix socket path \"%s\": must be an absolute path",
2476 		    gotd.unix_socket_path);
2477 
2478 	if (noaction)
2479 		return 0;
2480 
2481 	if (proc_id == PROC_GOTD) {
2482 		gotd.pid = getpid();
2483 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2484 		start_listener(argv0, confpath, daemonize, verbosity);
2485 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
2486 		if (daemonize && daemon(1, 0) == -1)
2487 			fatal("daemon");
2488 	} else if (proc_id == PROC_LISTEN) {
2489 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2490 		if (verbosity) {
2491 			log_info("socket: %s", gotd.unix_socket_path);
2492 			log_info("user: %s", pw->pw_name);
2493 		}
2494 
2495 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
2496 		    pw->pw_gid);
2497 		if (fd == -1) {
2498 			fatal("cannot listen on unix socket %s",
2499 			    gotd.unix_socket_path);
2500 		}
2501 		if (daemonize && daemon(0, 0) == -1)
2502 			fatal("daemon");
2503 	} else if (proc_id == PROC_AUTH) {
2504 		snprintf(title, sizeof(title), "%s %s",
2505 		    gotd_proc_names[proc_id], repo_path);
2506 		if (daemonize && daemon(0, 0) == -1)
2507 			fatal("daemon");
2508 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE) {
2509 		error = got_repo_pack_fds_open(&pack_fds);
2510 		if (error != NULL)
2511 			fatalx("cannot open pack tempfiles: %s", error->msg);
2512 		error = got_repo_temp_fds_open(&temp_fds);
2513 		if (error != NULL)
2514 			fatalx("cannot open pack tempfiles: %s", error->msg);
2515 		if (repo_path == NULL)
2516 			fatalx("repository path not specified");
2517 		snprintf(title, sizeof(title), "%s %s",
2518 		    gotd_proc_names[proc_id], repo_path);
2519 		if (daemonize && daemon(0, 0) == -1)
2520 			fatal("daemon");
2521 	} else
2522 		fatal("invalid process id %d", proc_id);
2523 
2524 	setproctitle("%s", title);
2525 	log_procinit(title);
2526 
2527 	/* Drop root privileges. */
2528 	if (setgid(pw->pw_gid) == -1)
2529 		fatal("setgid %d failed", pw->pw_gid);
2530 	if (setuid(pw->pw_uid) == -1)
2531 		fatal("setuid %d failed", pw->pw_uid);
2532 
2533 	event_init();
2534 
2535 	switch (proc_id) {
2536 	case PROC_GOTD:
2537 #ifndef PROFILE
2538 		if (pledge("stdio rpath wpath cpath proc exec "
2539 		    "sendfd recvfd fattr flock unveil", NULL) == -1)
2540 			err(1, "pledge");
2541 #endif
2542 		break;
2543 	case PROC_LISTEN:
2544 #ifndef PROFILE
2545 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
2546 			err(1, "pledge");
2547 #endif
2548 		/*
2549 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
2550 		 * sockets by revoking all filesystem access via unveil(2).
2551 		 */
2552 		apply_unveil_none();
2553 
2554 		listen_main(title, fd, gotd.connection_limits,
2555 		    gotd.nconnection_limits);
2556 		/* NOTREACHED */
2557 		break;
2558 	case PROC_AUTH:
2559 #ifndef PROFILE
2560 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
2561 			err(1, "pledge");
2562 #endif
2563 		/*
2564 		 * We need the "unix" pledge promise for getpeername(2) only.
2565 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
2566 		 * filesystem access via unveil(2). Access to password database
2567 		 * files will still work since "getpw" bypasses unveil(2).
2568 		 */
2569 		apply_unveil_none();
2570 
2571 		auth_main(title, &gotd.repos, repo_path);
2572 		/* NOTREACHED */
2573 		break;
2574 	case PROC_REPO_READ:
2575 #ifndef PROFILE
2576 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2577 			err(1, "pledge");
2578 #endif
2579 		apply_unveil_repo_readonly(repo_path);
2580 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2581 		/* NOTREACHED */
2582 		exit(0);
2583 	case PROC_REPO_WRITE:
2584 #ifndef PROFILE
2585 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2586 			err(1, "pledge");
2587 #endif
2588 		apply_unveil_repo_readonly(repo_path);
2589 		repo_write_main(title, repo_path, pack_fds, temp_fds);
2590 		/* NOTREACHED */
2591 		exit(0);
2592 	default:
2593 		fatal("invalid process id %d", proc_id);
2594 	}
2595 
2596 	if (proc_id != PROC_GOTD)
2597 		fatal("invalid process id %d", proc_id);
2598 
2599 	apply_unveil();
2600 
2601 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2602 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2603 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2604 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2605 	signal(SIGPIPE, SIG_IGN);
2606 
2607 	signal_add(&evsigint, NULL);
2608 	signal_add(&evsigterm, NULL);
2609 	signal_add(&evsighup, NULL);
2610 	signal_add(&evsigusr1, NULL);
2611 
2612 	gotd_imsg_event_add(&gotd.listen_proc.iev);
2613 
2614 	event_dispatch();
2615 
2616 	if (pack_fds)
2617 		got_repo_pack_fds_close(pack_fds);
2618 	free(repo_path);
2619 	return 0;
2620 }