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Date:: Thu Dec 29 18:10:53 2022 UTC
Message:: fix gotd authentication timeout The authentication timeout was accidentally overriden by the request timeout. Fix this and set both timeouts in the same place for clarity. ok op@
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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 <grp.h>
33 #include <imsg.h>
34 #include <sha1.h>
35 #include <signal.h>
36 #include <siphash.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <syslog.h>
42 #include <unistd.h>
43 
44 #include "got_error.h"
45 #include "got_opentemp.h"
46 #include "got_path.h"
47 #include "got_repository.h"
48 #include "got_object.h"
49 #include "got_reference.h"
50 
51 #include "got_lib_delta.h"
52 #include "got_lib_object.h"
53 #include "got_lib_object_cache.h"
54 #include "got_lib_sha1.h"
55 #include "got_lib_gitproto.h"
56 #include "got_lib_pack.h"
57 #include "got_lib_repository.h"
58 
59 #include "gotd.h"
60 #include "log.h"
61 #include "listen.h"
62 #include "auth.h"
63 #include "repo_read.h"
64 #include "repo_write.h"
65 
66 #ifndef nitems
67 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
68 #endif
69 
70 struct gotd_client {
71 	STAILQ_ENTRY(gotd_client)	 entry;
72 	enum gotd_client_state		 state;
73 	struct gotd_client_capability	*capabilities;
74 	size_t				 ncapa_alloc;
75 	size_t				 ncapabilities;
76 	uint32_t			 id;
77 	int				 fd;
78 	int				 delta_cache_fd;
79 	struct gotd_imsgev		 iev;
80 	struct event			 tmo;
81 	uid_t				 euid;
82 	gid_t				 egid;
83 	struct gotd_child_proc		*repo_read;
84 	struct gotd_child_proc		*repo_write;
85 	struct gotd_child_proc		*auth;
86 	int				 required_auth;
87 	char				*packfile_path;
88 	char				*packidx_path;
89 	int				 nref_updates;
90 };
91 STAILQ_HEAD(gotd_clients, gotd_client);
92 
93 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
94 static SIPHASH_KEY clients_hash_key;
95 volatile int client_cnt;
96 static struct timeval timeout = { 3600, 0 };
97 static struct timeval auth_timeout = { 5, 0 };
98 static struct gotd gotd;
99 
100 void gotd_sighdlr(int sig, short event, void *arg);
101 static void gotd_shutdown(void);
102 static const struct got_error *start_repo_child(struct gotd_client *,
103     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
104 static const struct got_error *start_auth_child(struct gotd_client *, int,
105     struct gotd_repo *, char *, const char *, int, int);
106 static void kill_proc(struct gotd_child_proc *, int);
107 
108 __dead static void
109 usage()
110 {
111 	fprintf(stderr, "usage: %s [-dv] [-f config-file]\n", getprogname());
112 	exit(1);
113 }
114 
115 static int
116 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
117 {
118 	struct sockaddr_un sun;
119 	int fd = -1;
120 	mode_t old_umask, mode;
121 
122 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
123 	if (fd == -1) {
124 		log_warn("socket");
125 		return -1;
126 	}
127 
128 	sun.sun_family = AF_UNIX;
129 	if (strlcpy(sun.sun_path, unix_socket_path,
130 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
131 		log_warnx("%s: name too long", unix_socket_path);
132 		close(fd);
133 		return -1;
134 	}
135 
136 	if (unlink(unix_socket_path) == -1) {
137 		if (errno != ENOENT) {
138 			log_warn("unlink %s", unix_socket_path);
139 			close(fd);
140 			return -1;
141 		}
142 	}
143 
144 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
145 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
146 
147 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
148 		log_warn("bind: %s", unix_socket_path);
149 		close(fd);
150 		umask(old_umask);
151 		return -1;
152 	}
153 
154 	umask(old_umask);
155 
156 	if (chmod(unix_socket_path, mode) == -1) {
157 		log_warn("chmod %o %s", mode, unix_socket_path);
158 		close(fd);
159 		unlink(unix_socket_path);
160 		return -1;
161 	}
162 
163 	if (chown(unix_socket_path, uid, gid) == -1) {
164 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
165 		close(fd);
166 		unlink(unix_socket_path);
167 		return -1;
168 	}
169 
170 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
171 		log_warn("listen");
172 		close(fd);
173 		unlink(unix_socket_path);
174 		return -1;
175 	}
176 
177 	return fd;
178 }
179 
180 static struct group *
181 match_group(gid_t *groups, int ngroups, const char *unix_group_name)
182 {
183 	struct group *gr;
184 	int i;
185 
186 	for (i = 0; i < ngroups; i++) {
187 		gr = getgrgid(groups[i]);
188 		if (gr == NULL) {
189 			log_warn("getgrgid %d", groups[i]);
190 			continue;
191 		}
192 		if (strcmp(gr->gr_name, unix_group_name) == 0)
193 			return gr;
194 	}
195 
196 	return NULL;
197 }
198 
199 static uint64_t
200 client_hash(uint32_t client_id)
201 {
202 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
203 }
204 
205 static void
206 add_client(struct gotd_client *client)
207 {
208 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
209 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
210 	client_cnt++;
211 }
212 
213 static struct gotd_client *
214 find_client(uint32_t client_id)
215 {
216 	uint64_t slot;
217 	struct gotd_client *c;
218 
219 	slot = client_hash(client_id) % nitems(gotd_clients);
220 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
221 		if (c->id == client_id)
222 			return c;
223 	}
224 
225 	return NULL;
226 }
227 
228 static struct gotd_child_proc *
229 get_client_proc(struct gotd_client *client)
230 {
231 	if (client->repo_read && client->repo_write) {
232 		fatalx("uid %d is reading and writing in the same session",
233 		    client->euid);
234 		/* NOTREACHED */
235 	}
236 
237 	if (client->repo_read)
238 		return client->repo_read;
239 	else if (client->repo_write)
240 		return client->repo_write;
241 
242 	return NULL;
243 }
244 
245 static struct gotd_client *
246 find_client_by_proc_fd(int fd)
247 {
248 	uint64_t slot;
249 
250 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
251 		struct gotd_client *c;
252 
253 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
254 			struct gotd_child_proc *proc = get_client_proc(c);
255 			if (proc && proc->iev.ibuf.fd == fd)
256 				return c;
257 			if (c->auth && c->auth->iev.ibuf.fd == fd)
258 				return c;
259 		}
260 	}
261 
262 	return NULL;
263 }
264 
265 static int
266 client_is_reading(struct gotd_client *client)
267 {
268 	return client->repo_read != NULL;
269 }
270 
271 static int
272 client_is_writing(struct gotd_client *client)
273 {
274 	return client->repo_write != NULL;
275 }
276 
277 static const struct got_error *
278 ensure_client_is_reading(struct gotd_client *client)
279 {
280 	if (!client_is_reading(client)) {
281 		return got_error_fmt(GOT_ERR_BAD_PACKET,
282 		    "uid %d made a read-request but is not reading from "
283 		    "a repository", client->euid);
284 	}
285 
286 	return NULL;
287 }
288 
289 static const struct got_error *
290 ensure_client_is_writing(struct gotd_client *client)
291 {
292 	if (!client_is_writing(client)) {
293 		return got_error_fmt(GOT_ERR_BAD_PACKET,
294 		    "uid %d made a write-request but is not writing to "
295 		    "a repository", client->euid);
296 	}
297 
298 	return NULL;
299 }
300 
301 static const struct got_error *
302 ensure_client_is_not_writing(struct gotd_client *client)
303 {
304 	if (client_is_writing(client)) {
305 		return got_error_fmt(GOT_ERR_BAD_PACKET,
306 		    "uid %d made a read-request but is writing to "
307 		    "a repository", client->euid);
308 	}
309 
310 	return NULL;
311 }
312 
313 static const struct got_error *
314 ensure_client_is_not_reading(struct gotd_client *client)
315 {
316 	if (client_is_reading(client)) {
317 		return got_error_fmt(GOT_ERR_BAD_PACKET,
318 		    "uid %d made a write-request but is reading from "
319 		    "a repository", client->euid);
320 	}
321 
322 	return NULL;
323 }
324 
325 static void
326 wait_for_child(pid_t child_pid)
327 {
328 	pid_t pid;
329 	int status;
330 
331 	log_debug("waiting for child PID %ld to terminate",
332 	    (long)child_pid);
333 
334 	do {
335 		pid = waitpid(child_pid, &status, WNOHANG);
336 		if (pid == -1) {
337 			if (errno != EINTR && errno != ECHILD)
338 				fatal("wait");
339 		} else if (WIFSIGNALED(status)) {
340 			log_warnx("child PID %ld terminated; signal %d",
341 			    (long)pid, WTERMSIG(status));
342 		}	
343 	} while (pid != -1 || (pid == -1 && errno == EINTR));
344 }
345 
346 static void
347 kill_auth_proc(struct gotd_client *client)
348 {
349 	struct gotd_child_proc *proc;
350 
351 	if (client->auth == NULL)
352 		return;
353 
354 	proc = client->auth;
355 	client->auth = NULL;
356 
357 	event_del(&proc->iev.ev);
358 	msgbuf_clear(&proc->iev.ibuf.w);
359 	close(proc->iev.ibuf.fd);
360 	kill_proc(proc, 0);
361 	wait_for_child(proc->pid);
362 	free(proc);
363 }
364 
365 static void
366 disconnect(struct gotd_client *client)
367 {
368 	struct gotd_imsg_disconnect idisconnect;
369 	struct gotd_child_proc *proc = get_client_proc(client);
370 	struct gotd_child_proc *listen_proc = &gotd.listen_proc;
371 	uint64_t slot;
372 
373 	log_debug("uid %d: disconnecting", client->euid);
374 
375 	kill_auth_proc(client);
376 
377 	idisconnect.client_id = client->id;
378 	if (proc) {
379 		if (gotd_imsg_compose_event(&proc->iev,
380 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
381 		    &idisconnect, sizeof(idisconnect)) == -1)
382 			log_warn("imsg compose DISCONNECT");
383 
384 		msgbuf_clear(&proc->iev.ibuf.w);
385 		close(proc->iev.ibuf.fd);
386 		kill_proc(proc, 0);
387 		wait_for_child(proc->pid);
388 		free(proc);
389 		proc = NULL;
390 	}
391 
392 	if (gotd_imsg_compose_event(&listen_proc->iev,
393 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
394 	    &idisconnect, sizeof(idisconnect)) == -1)
395 		log_warn("imsg compose DISCONNECT");
396 
397 	slot = client_hash(client->id) % nitems(gotd_clients);
398 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
399 	imsg_clear(&client->iev.ibuf);
400 	event_del(&client->iev.ev);
401 	evtimer_del(&client->tmo);
402 	close(client->fd);
403 	if (client->delta_cache_fd != -1)
404 		close(client->delta_cache_fd);
405 	if (client->packfile_path) {
406 		if (unlink(client->packfile_path) == -1 && errno != ENOENT)
407 			log_warn("unlink %s: ", client->packfile_path);
408 		free(client->packfile_path);
409 	}
410 	if (client->packidx_path) {
411 		if (unlink(client->packidx_path) == -1 && errno != ENOENT)
412 			log_warn("unlink %s: ", client->packidx_path);
413 		free(client->packidx_path);
414 	}
415 	free(client->capabilities);
416 	free(client);
417 	client_cnt--;
418 }
419 
420 static void
421 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
422 {
423 	struct imsgbuf ibuf;
424 
425 	log_warnx("uid %d: %s", client->euid, err->msg);
426 	if (err->code != GOT_ERR_EOF) {
427 		imsg_init(&ibuf, client->fd);
428 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
429 		imsg_clear(&ibuf);
430 	}
431 	disconnect(client);
432 }
433 
434 static const struct got_error *
435 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
436 {
437 	const struct got_error *err = NULL;
438 	struct gotd_imsg_info_repo irepo;
439 
440 	memset(&irepo, 0, sizeof(irepo));
441 
442 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
443 	    >= sizeof(irepo.repo_name))
444 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
445 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
446 	    >= sizeof(irepo.repo_path))
447 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
448 
449 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
450 	    &irepo, sizeof(irepo)) == -1) {
451 		err = got_error_from_errno("imsg compose INFO_REPO");
452 		if (err)
453 			return err;
454 	}
455 
456 	return NULL;
457 }
458 
459 static const struct got_error *
460 send_capability(struct gotd_client_capability *capa, struct gotd_imsgev* iev)
461 {
462 	const struct got_error *err = NULL;
463 	struct gotd_imsg_capability icapa;
464 	size_t len;
465 	struct ibuf *wbuf;
466 
467 	memset(&icapa, 0, sizeof(icapa));
468 
469 	icapa.key_len = strlen(capa->key);
470 	len = sizeof(icapa) + icapa.key_len;
471 	if (capa->value) {
472 		icapa.value_len = strlen(capa->value);
473 		len += icapa.value_len;
474 	}
475 
476 	wbuf = imsg_create(&iev->ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
477 	if (wbuf == NULL) {
478 		err = got_error_from_errno("imsg_create CAPABILITY");
479 		return err;
480 	}
481 
482 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
483 		return got_error_from_errno("imsg_add CAPABILITY");
484 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
485 		return got_error_from_errno("imsg_add CAPABILITY");
486 	if (capa->value) {
487 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
488 			return got_error_from_errno("imsg_add CAPABILITY");
489 	}
490 
491 	wbuf->fd = -1;
492 	imsg_close(&iev->ibuf, wbuf);
493 
494 	gotd_imsg_event_add(iev);
495 
496 	return NULL;
497 }
498 
499 static const struct got_error *
500 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
501 {
502 	const struct got_error *err = NULL;
503 	struct gotd_imsg_info_client iclient;
504 	struct gotd_child_proc *proc;
505 	size_t i;
506 
507 	memset(&iclient, 0, sizeof(iclient));
508 	iclient.euid = client->euid;
509 	iclient.egid = client->egid;
510 
511 	proc = get_client_proc(client);
512 	if (proc) {
513 		if (strlcpy(iclient.repo_name, proc->repo_path,
514 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
515 			return got_error_msg(GOT_ERR_NO_SPACE,
516 			    "repo name too long");
517 		}
518 		if (client_is_writing(client))
519 			iclient.is_writing = 1;
520 	}
521 
522 	iclient.state = client->state;
523 	iclient.ncapabilities = client->ncapabilities;
524 
525 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
526 	    &iclient, sizeof(iclient)) == -1) {
527 		err = got_error_from_errno("imsg compose INFO_CLIENT");
528 		if (err)
529 			return err;
530 	}
531 
532 	for (i = 0; i < client->ncapabilities; i++) {
533 		struct gotd_client_capability *capa;
534 		capa = &client->capabilities[i];
535 		err = send_capability(capa, iev);
536 		if (err)
537 			return err;
538 	}
539 
540 	return NULL;
541 }
542 
543 static const struct got_error *
544 send_info(struct gotd_client *client)
545 {
546 	const struct got_error *err = NULL;
547 	struct gotd_imsg_info info;
548 	uint64_t slot;
549 	struct gotd_repo *repo;
550 
551 	info.pid = gotd.pid;
552 	info.verbosity = gotd.verbosity;
553 	info.nrepos = gotd.nrepos;
554 	info.nclients = client_cnt - 1;
555 
556 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
557 	    &info, sizeof(info)) == -1) {
558 		err = got_error_from_errno("imsg compose INFO");
559 		if (err)
560 			return err;
561 	}
562 
563 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
564 		err = send_repo_info(&client->iev, repo);
565 		if (err)
566 			return err;
567 	}
568 
569 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
570 		struct gotd_client *c;
571 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
572 			if (c->id == client->id)
573 				continue;
574 			err = send_client_info(&client->iev, c);
575 			if (err)
576 				return err;
577 		}
578 	}
579 
580 	return NULL;
581 }
582 
583 static const struct got_error *
584 stop_gotd(struct gotd_client *client)
585 {
586 
587 	if (client->euid != 0)
588 		return got_error_set_errno(EPERM, "stop");
589 
590 	gotd_shutdown();
591 	/* NOTREACHED */
592 	return NULL;
593 }
594 
595 static struct gotd_repo *
596 find_repo_by_name(const char *repo_name)
597 {
598 	struct gotd_repo *repo;
599 	size_t namelen;
600 
601 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
602 		namelen = strlen(repo->name);
603 		if (strncmp(repo->name, repo_name, namelen) != 0)
604 			continue;
605 		if (repo_name[namelen] == '\0' ||
606 		    strcmp(&repo_name[namelen], ".git") == 0)
607 			return repo;
608 	}
609 
610 	return NULL;
611 }
612 
613 static const struct got_error *
614 start_client_session(struct gotd_client *client, struct imsg *imsg)
615 {
616 	const struct got_error *err;
617 	struct gotd_imsg_list_refs ireq;
618 	struct gotd_repo *repo = NULL;
619 	size_t datalen;
620 
621 	log_debug("list-refs request from uid %d", client->euid);
622 
623 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
624 	if (datalen != sizeof(ireq))
625 		return got_error(GOT_ERR_PRIVSEP_LEN);
626 
627 	memcpy(&ireq, imsg->data, datalen);
628 
629 	if (ireq.client_is_reading) {
630 		err = ensure_client_is_not_writing(client);
631 		if (err)
632 			return err;
633 		repo = find_repo_by_name(ireq.repo_name);
634 		if (repo == NULL)
635 			return got_error(GOT_ERR_NOT_GIT_REPO);
636 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
637 		    gotd.argv0, gotd.confpath, gotd.daemonize,
638 		    gotd.verbosity);
639 		if (err)
640 			return err;
641 	} else {
642 		err = ensure_client_is_not_reading(client);
643 		if (err)
644 			return err;
645 		repo = find_repo_by_name(ireq.repo_name);
646 		if (repo == NULL)
647 			return got_error(GOT_ERR_NOT_GIT_REPO);
648 		err = start_auth_child(client,
649 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
650 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
651 		    gotd.verbosity);
652 		if (err)
653 			return err;
654 	}
655 
656 	/* Flow continues upon authentication successs/failure or timeout. */
657 	return NULL;
658 }
659 
660 static const struct got_error *
661 forward_want(struct gotd_client *client, struct imsg *imsg)
662 {
663 	struct gotd_imsg_want ireq;
664 	struct gotd_imsg_want iwant;
665 	size_t datalen;
666 
667 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
668 	if (datalen != sizeof(ireq))
669 		return got_error(GOT_ERR_PRIVSEP_LEN);
670 
671 	memcpy(&ireq, imsg->data, datalen);
672 
673 	memset(&iwant, 0, sizeof(iwant));
674 	memcpy(iwant.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
675 	iwant.client_id = client->id;
676 
677 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_WANT,
678 	    PROC_GOTD, -1, &iwant, sizeof(iwant)) == -1)
679 		return got_error_from_errno("imsg compose WANT");
680 
681 	return NULL;
682 }
683 
684 static const struct got_error *
685 forward_ref_update(struct gotd_client *client, struct imsg *imsg)
686 {
687 	const struct got_error *err = NULL;
688 	struct gotd_imsg_ref_update ireq;
689 	struct gotd_imsg_ref_update *iref = NULL;
690 	size_t datalen;
691 
692 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
693 	if (datalen < sizeof(ireq))
694 		return got_error(GOT_ERR_PRIVSEP_LEN);
695 	memcpy(&ireq, imsg->data, sizeof(ireq));
696 	if (datalen != sizeof(ireq) + ireq.name_len)
697 		return got_error(GOT_ERR_PRIVSEP_LEN);
698 
699 	iref = malloc(datalen);
700 	if (iref == NULL)
701 		return got_error_from_errno("malloc");
702 	memcpy(iref, imsg->data, datalen);
703 
704 	iref->client_id = client->id;
705 	if (gotd_imsg_compose_event(&client->repo_write->iev,
706 	    GOTD_IMSG_REF_UPDATE, PROC_GOTD, -1, iref, datalen) == -1)
707 		err = got_error_from_errno("imsg compose REF_UPDATE");
708 	free(iref);
709 	return err;
710 }
711 
712 static const struct got_error *
713 forward_have(struct gotd_client *client, struct imsg *imsg)
714 {
715 	struct gotd_imsg_have ireq;
716 	struct gotd_imsg_have ihave;
717 	size_t datalen;
718 
719 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
720 	if (datalen != sizeof(ireq))
721 		return got_error(GOT_ERR_PRIVSEP_LEN);
722 
723 	memcpy(&ireq, imsg->data, datalen);
724 
725 	memset(&ihave, 0, sizeof(ihave));
726 	memcpy(ihave.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
727 	ihave.client_id = client->id;
728 
729 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_HAVE,
730 	    PROC_GOTD, -1, &ihave, sizeof(ihave)) == -1)
731 		return got_error_from_errno("imsg compose HAVE");
732 
733 	return NULL;
734 }
735 
736 static int
737 client_has_capability(struct gotd_client *client, const char *capastr)
738 {
739 	struct gotd_client_capability *capa;
740 	size_t i;
741 
742 	if (client->ncapabilities == 0)
743 		return 0;
744 
745 	for (i = 0; i < client->ncapabilities; i++) {
746 		capa = &client->capabilities[i];
747 		if (strcmp(capa->key, capastr) == 0)
748 			return 1;
749 	}
750 
751 	return 0;
752 }
753 
754 static const struct got_error *
755 recv_capabilities(struct gotd_client *client, struct imsg *imsg)
756 {
757 	struct gotd_imsg_capabilities icapas;
758 	size_t datalen;
759 
760 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
761 	if (datalen != sizeof(icapas))
762 		return got_error(GOT_ERR_PRIVSEP_LEN);
763 	memcpy(&icapas, imsg->data, sizeof(icapas));
764 
765 	client->ncapa_alloc = icapas.ncapabilities;
766 	client->capabilities = calloc(client->ncapa_alloc,
767 	    sizeof(*client->capabilities));
768 	if (client->capabilities == NULL) {
769 		client->ncapa_alloc = 0;
770 		return got_error_from_errno("calloc");
771 	}
772 
773 	log_debug("expecting %zu capabilities from uid %d",
774 	    client->ncapa_alloc, client->euid);
775 	return NULL;
776 }
777 
778 static const struct got_error *
779 recv_capability(struct gotd_client *client, struct imsg *imsg)
780 {
781 	struct gotd_imsg_capability icapa;
782 	struct gotd_client_capability *capa;
783 	size_t datalen;
784 	char *key, *value = NULL;
785 
786 	if (client->capabilities == NULL ||
787 	    client->ncapabilities >= client->ncapa_alloc) {
788 		return got_error_msg(GOT_ERR_BAD_REQUEST,
789 		    "unexpected capability received");
790 	}
791 
792 	memset(&icapa, 0, sizeof(icapa));
793 
794 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
795 	if (datalen < sizeof(icapa))
796 		return got_error(GOT_ERR_PRIVSEP_LEN);
797 	memcpy(&icapa, imsg->data, sizeof(icapa));
798 
799 	if (datalen != sizeof(icapa) + icapa.key_len + icapa.value_len)
800 		return got_error(GOT_ERR_PRIVSEP_LEN);
801 
802 	key = malloc(icapa.key_len + 1);
803 	if (key == NULL)
804 		return got_error_from_errno("malloc");
805 	if (icapa.value_len > 0) {
806 		value = malloc(icapa.value_len + 1);
807 		if (value == NULL) {
808 			free(key);
809 			return got_error_from_errno("malloc");
810 		}
811 	}
812 
813 	memcpy(key, imsg->data + sizeof(icapa), icapa.key_len);
814 	key[icapa.key_len] = '\0';
815 	if (value) {
816 		memcpy(value, imsg->data + sizeof(icapa) + icapa.key_len,
817 		    icapa.value_len);
818 		value[icapa.value_len] = '\0';
819 	}
820 
821 	capa = &client->capabilities[client->ncapabilities++];
822 	capa->key = key;
823 	capa->value = value;
824 
825 	if (value)
826 		log_debug("uid %d: capability %s=%s", client->euid, key, value);
827 	else
828 		log_debug("uid %d: capability %s", client->euid, key);
829 
830 	return NULL;
831 }
832 
833 static const struct got_error *
834 send_packfile(struct gotd_client *client)
835 {
836 	const struct got_error *err = NULL;
837 	struct gotd_imsg_send_packfile ipack;
838 	struct gotd_imsg_packfile_pipe ipipe;
839 	int pipe[2];
840 
841 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
842 		return got_error_from_errno("socketpair");
843 
844 	memset(&ipack, 0, sizeof(ipack));
845 	memset(&ipipe, 0, sizeof(ipipe));
846 
847 	ipack.client_id = client->id;
848 	if (client_has_capability(client, GOT_CAPA_SIDE_BAND_64K))
849 		ipack.report_progress = 1;
850 
851 	client->delta_cache_fd = got_opentempfd();
852 	if (client->delta_cache_fd == -1)
853 		return got_error_from_errno("got_opentempfd");
854 
855 	if (gotd_imsg_compose_event(&client->repo_read->iev,
856 	    GOTD_IMSG_SEND_PACKFILE, PROC_GOTD, client->delta_cache_fd,
857 	    &ipack, sizeof(ipack)) == -1) {
858 		err = got_error_from_errno("imsg compose SEND_PACKFILE");
859 		close(pipe[0]);
860 		close(pipe[1]);
861 		return err;
862 	}
863 
864 	ipipe.client_id = client->id;
865 
866 	/* Send pack pipe end 0 to repo_read. */
867 	if (gotd_imsg_compose_event(&client->repo_read->iev,
868 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
869 	        &ipipe, sizeof(ipipe)) == -1) {
870 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
871 		close(pipe[1]);
872 		return err;
873 	}
874 
875 	/* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
876 	if (gotd_imsg_compose_event(&client->iev,
877 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
878 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
879 
880 	return err;
881 }
882 
883 static const struct got_error *
884 recv_packfile(struct gotd_client *client)
885 {
886 	const struct got_error *err = NULL;
887 	struct gotd_imsg_recv_packfile ipack;
888 	struct gotd_imsg_packfile_pipe ipipe;
889 	struct gotd_imsg_packidx_file ifile;
890 	char *basepath = NULL, *pack_path = NULL, *idx_path = NULL;
891 	int packfd = -1, idxfd = -1;
892 	int pipe[2] = { -1, -1 };
893 
894 	if (client->packfile_path) {
895 		return got_error_fmt(GOT_ERR_PRIVSEP_MSG,
896 		    "uid %d already has a pack file", client->euid);
897 	}
898 
899 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
900 		return got_error_from_errno("socketpair");
901 
902 	memset(&ipipe, 0, sizeof(ipipe));
903 	ipipe.client_id = client->id;
904 
905 	/* Send pack pipe end 0 to repo_write. */
906 	if (gotd_imsg_compose_event(&client->repo_write->iev,
907 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
908 	        &ipipe, sizeof(ipipe)) == -1) {
909 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
910 		pipe[0] = -1;
911 		goto done;
912 	}
913 	pipe[0] = -1;
914 
915 	/* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
916 	if (gotd_imsg_compose_event(&client->iev,
917 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
918 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
919 	pipe[1] = -1;
920 
921 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.pack",
922 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
923 	    client->euid) == -1) {
924 		err = got_error_from_errno("asprintf");
925 		goto done;
926 	}
927 
928 	err = got_opentemp_named_fd(&pack_path, &packfd, basepath, "");
929 	if (err)
930 		goto done;
931 
932 	free(basepath);
933 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.idx",
934 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
935 	    client->euid) == -1) {
936 		err = got_error_from_errno("asprintf");
937 		basepath = NULL;
938 		goto done;
939 	}
940 	err = got_opentemp_named_fd(&idx_path, &idxfd, basepath, "");
941 	if (err)
942 		goto done;
943 
944 	memset(&ifile, 0, sizeof(ifile));
945 	ifile.client_id = client->id;
946 	if (gotd_imsg_compose_event(&client->repo_write->iev,
947 	    GOTD_IMSG_PACKIDX_FILE, PROC_GOTD, idxfd,
948 	    &ifile, sizeof(ifile)) == -1) {
949 		err = got_error_from_errno("imsg compose PACKIDX_FILE");
950 		idxfd = -1;
951 		goto done;
952 	}
953 	idxfd = -1;
954 
955 	memset(&ipack, 0, sizeof(ipack));
956 	ipack.client_id = client->id;
957 	if (client_has_capability(client, GOT_CAPA_REPORT_STATUS))
958 		ipack.report_status = 1;
959 
960 	if (gotd_imsg_compose_event(&client->repo_write->iev,
961 	    GOTD_IMSG_RECV_PACKFILE, PROC_GOTD, packfd,
962 	    &ipack, sizeof(ipack)) == -1) {
963 		err = got_error_from_errno("imsg compose RECV_PACKFILE");
964 		packfd = -1;
965 		goto done;
966 	}
967 	packfd = -1;
968 
969 done:
970 	free(basepath);
971 	if (pipe[0] != -1 && close(pipe[0]) == -1 && err == NULL)
972 		err = got_error_from_errno("close");
973 	if (pipe[1] != -1 && close(pipe[1]) == -1 && err == NULL)
974 		err = got_error_from_errno("close");
975 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
976 		err = got_error_from_errno("close");
977 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
978 		err = got_error_from_errno("close");
979 	if (err) {
980 		free(pack_path);
981 		free(idx_path);
982 	} else {
983 		client->packfile_path = pack_path;
984 		client->packidx_path = idx_path;
985 	}
986 	return err;
987 }
988 
989 static void
990 gotd_request(int fd, short events, void *arg)
991 {
992 	struct gotd_imsgev *iev = arg;
993 	struct imsgbuf *ibuf = &iev->ibuf;
994 	struct gotd_client *client = iev->handler_arg;
995 	const struct got_error *err = NULL;
996 	struct imsg imsg;
997 	ssize_t n;
998 
999 	if (events & EV_WRITE) {
1000 		while (ibuf->w.queued) {
1001 			n = msgbuf_write(&ibuf->w);
1002 			if (n == -1 && errno == EPIPE) {
1003 				/*
1004 				 * The client has closed its socket.
1005 				 * This can happen when Git clients are
1006 				 * done sending pack file data.
1007 				*/
1008 				msgbuf_clear(&ibuf->w);
1009 				continue;
1010 			} else if (n == -1 && errno != EAGAIN) {
1011 				err = got_error_from_errno("imsg_flush");
1012 				disconnect_on_error(client, err);
1013 				return;
1014 			}
1015 			if (n == 0) {
1016 				/* Connection closed. */
1017 				err = got_error(GOT_ERR_EOF);
1018 				disconnect_on_error(client, err);
1019 				return;
1020 			}
1021 		}
1022 
1023 		/* Disconnect gotctl(8) now that messages have been sent. */
1024 		if (!client_is_reading(client) && !client_is_writing(client)) {
1025 			disconnect(client);
1026 			return;
1027 		}
1028 	}
1029 
1030 	if ((events & EV_READ) == 0)
1031 		return;
1032 
1033 	memset(&imsg, 0, sizeof(imsg));
1034 
1035 	while (err == NULL) {
1036 		err = gotd_imsg_recv(&imsg, ibuf, 0);
1037 		if (err) {
1038 			if (err->code == GOT_ERR_PRIVSEP_READ)
1039 				err = NULL;
1040 			break;
1041 		}
1042 
1043 		evtimer_del(&client->tmo);
1044 
1045 		switch (imsg.hdr.type) {
1046 		case GOTD_IMSG_INFO:
1047 			err = send_info(client);
1048 			break;
1049 		case GOTD_IMSG_STOP:
1050 			err = stop_gotd(client);
1051 			break;
1052 		case GOTD_IMSG_LIST_REFS:
1053 			if (client->state != GOTD_STATE_EXPECT_LIST_REFS) {
1054 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1055 				    "unexpected list-refs request received");
1056 				break;
1057 			}
1058 			err = start_client_session(client, &imsg);
1059 			if (err)
1060 				break;
1061 			break;
1062 		case GOTD_IMSG_CAPABILITIES:
1063 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1064 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1065 				    "unexpected capabilities received");
1066 				break;
1067 			}
1068 			log_debug("receiving capabilities from uid %d",
1069 			    client->euid);
1070 			err = recv_capabilities(client, &imsg);
1071 			break;
1072 		case GOTD_IMSG_CAPABILITY:
1073 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1074 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1075 				    "unexpected capability received");
1076 				break;
1077 			}
1078 			err = recv_capability(client, &imsg);
1079 			if (err || client->ncapabilities < client->ncapa_alloc)
1080 				break;
1081 			if (client_is_reading(client)) {
1082 				client->state = GOTD_STATE_EXPECT_WANT;
1083 				log_debug("uid %d: expecting want-lines",
1084 				    client->euid);
1085 			} else if (client_is_writing(client)) {
1086 				client->state = GOTD_STATE_EXPECT_REF_UPDATE;
1087 				log_debug("uid %d: expecting ref-update-lines",
1088 				    client->euid);
1089 			} else
1090 				fatalx("client %d is both reading and writing",
1091 				    client->euid);
1092 			break;
1093 		case GOTD_IMSG_WANT:
1094 			if (client->state != GOTD_STATE_EXPECT_WANT) {
1095 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1096 				    "unexpected want-line received");
1097 				break;
1098 			}
1099 			log_debug("received want-line from uid %d",
1100 			    client->euid);
1101 			err = ensure_client_is_reading(client);
1102 			if (err)
1103 				break;
1104 			err = forward_want(client, &imsg);
1105 			break;
1106 		case GOTD_IMSG_REF_UPDATE:
1107 			if (client->state != GOTD_STATE_EXPECT_REF_UPDATE) {
1108 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1109 				    "unexpected ref-update-line received");
1110 				break;
1111 			}
1112 			log_debug("received ref-update-line from uid %d",
1113 			    client->euid);
1114 			err = ensure_client_is_writing(client);
1115 			if (err)
1116 				break;
1117 			err = forward_ref_update(client, &imsg);
1118 			if (err)
1119 				break;
1120 			client->state = GOTD_STATE_EXPECT_MORE_REF_UPDATES;
1121 			break;
1122 		case GOTD_IMSG_HAVE:
1123 			if (client->state != GOTD_STATE_EXPECT_HAVE) {
1124 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1125 				    "unexpected have-line received");
1126 				break;
1127 			}
1128 			log_debug("received have-line from uid %d",
1129 			    client->euid);
1130 			err = ensure_client_is_reading(client);
1131 			if (err)
1132 				break;
1133 			err = forward_have(client, &imsg);
1134 			if (err)
1135 				break;
1136 			break;
1137 		case GOTD_IMSG_FLUSH:
1138 			if (client->state == GOTD_STATE_EXPECT_WANT ||
1139 			    client->state == GOTD_STATE_EXPECT_HAVE) {
1140 				err = ensure_client_is_reading(client);
1141 				if (err)
1142 					break;
1143 			} else if (client->state ==
1144 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1145 				err = ensure_client_is_writing(client);
1146 				if (err)
1147 					break;
1148 			} else {
1149 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1150 				    "unexpected flush-pkt received");
1151 				break;
1152 			}
1153 			log_debug("received flush-pkt from uid %d",
1154 			    client->euid);
1155 			if (client->state == GOTD_STATE_EXPECT_WANT) {
1156 				client->state = GOTD_STATE_EXPECT_HAVE;
1157 				log_debug("uid %d: expecting have-lines",
1158 				    client->euid);
1159 			} else if (client->state == GOTD_STATE_EXPECT_HAVE) {
1160 				client->state = GOTD_STATE_EXPECT_DONE;
1161 				log_debug("uid %d: expecting 'done'",
1162 				    client->euid);
1163 			} else if (client->state ==
1164 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1165 				client->state = GOTD_STATE_EXPECT_PACKFILE;
1166 				log_debug("uid %d: expecting packfile",
1167 				    client->euid);
1168 				err = recv_packfile(client);
1169 			} else {
1170 				/* should not happen, see above */
1171 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1172 				    "unexpected client state");
1173 				break;
1174 			}
1175 			break;
1176 		case GOTD_IMSG_DONE:
1177 			if (client->state != GOTD_STATE_EXPECT_HAVE &&
1178 			    client->state != GOTD_STATE_EXPECT_DONE) {
1179 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1180 				    "unexpected flush-pkt received");
1181 				break;
1182 			}
1183 			log_debug("received 'done' from uid %d", client->euid);
1184 			err = ensure_client_is_reading(client);
1185 			if (err)
1186 				break;
1187 			client->state = GOTD_STATE_DONE;
1188 			err = send_packfile(client);
1189 			break;
1190 		default:
1191 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1192 			break;
1193 		}
1194 
1195 		imsg_free(&imsg);
1196 	}
1197 
1198 	if (err) {
1199 		if (err->code != GOT_ERR_EOF ||
1200 		    client->state != GOTD_STATE_EXPECT_PACKFILE)
1201 			disconnect_on_error(client, err);
1202 	} else {
1203 		gotd_imsg_event_add(&client->iev);
1204 		if (client->state == GOTD_STATE_EXPECT_LIST_REFS)
1205 			evtimer_add(&client->tmo, &auth_timeout);
1206 		else
1207 			evtimer_add(&client->tmo, &timeout);
1208 	}
1209 }
1210 
1211 static void
1212 gotd_request_timeout(int fd, short events, void *arg)
1213 {
1214 	struct gotd_client *client = arg;
1215 
1216 	log_debug("disconnecting uid %d due to timeout", client->euid);
1217 	disconnect(client);
1218 }
1219 
1220 static const struct got_error *
1221 recv_connect(uint32_t *client_id, struct imsg *imsg)
1222 {
1223 	const struct got_error *err = NULL;
1224 	struct gotd_imsg_connect iconnect;
1225 	size_t datalen;
1226 	int s = -1;
1227 	struct gotd_client *client = NULL;
1228 	uid_t euid;
1229 	gid_t egid;
1230 
1231 	*client_id = 0;
1232 
1233 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1234 	if (datalen != sizeof(iconnect))
1235 		return got_error(GOT_ERR_PRIVSEP_LEN);
1236 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
1237 
1238 	s = imsg->fd;
1239 	if (s == -1) {
1240 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
1241 		goto done;
1242 	}
1243 
1244 	if (find_client(iconnect.client_id)) {
1245 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
1246 		goto done;
1247 	}
1248 
1249 	if (getpeereid(s, &euid, &egid) == -1) {
1250 		err = got_error_from_errno("getpeerid");
1251 		goto done;
1252 	}
1253 
1254 	client = calloc(1, sizeof(*client));
1255 	if (client == NULL) {
1256 		err = got_error_from_errno("calloc");
1257 		goto done;
1258 	}
1259 
1260 	*client_id = iconnect.client_id;
1261 
1262 	client->state = GOTD_STATE_EXPECT_LIST_REFS;
1263 	client->id = iconnect.client_id;
1264 	client->fd = s;
1265 	s = -1;
1266 	client->delta_cache_fd = -1;
1267 	client->euid = euid;
1268 	client->egid = egid;
1269 	client->nref_updates = -1;
1270 
1271 	imsg_init(&client->iev.ibuf, client->fd);
1272 	client->iev.handler = gotd_request;
1273 	client->iev.events = EV_READ;
1274 	client->iev.handler_arg = client;
1275 
1276 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
1277 	    &client->iev);
1278 	gotd_imsg_event_add(&client->iev);
1279 
1280 	evtimer_set(&client->tmo, gotd_request_timeout, client);
1281 
1282 	add_client(client);
1283 	log_debug("%s: new client uid %d connected on fd %d", __func__,
1284 	    client->euid, client->fd);
1285 done:
1286 	if (err) {
1287 		struct gotd_child_proc *listen_proc = &gotd.listen_proc;
1288 		struct gotd_imsg_disconnect idisconnect;
1289 
1290 		idisconnect.client_id = client->id;
1291 		if (gotd_imsg_compose_event(&listen_proc->iev,
1292 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
1293 		    &idisconnect, sizeof(idisconnect)) == -1)
1294 			log_warn("imsg compose DISCONNECT");
1295 
1296 		if (s != -1)
1297 			close(s);
1298 	}
1299 
1300 	return err;
1301 }
1302 
1303 static const char *gotd_proc_names[PROC_MAX] = {
1304 	"parent",
1305 	"listen",
1306 	"auth",
1307 	"repo_read",
1308 	"repo_write"
1309 };
1310 
1311 static void
1312 kill_proc(struct gotd_child_proc *proc, int fatal)
1313 {
1314 	if (fatal) {
1315 		log_warnx("sending SIGKILL to PID %d", proc->pid);
1316 		kill(proc->pid, SIGKILL);
1317 	} else
1318 		kill(proc->pid, SIGTERM);
1319 }
1320 
1321 static void
1322 gotd_shutdown(void)
1323 {
1324 	struct gotd_child_proc *proc;
1325 	uint64_t slot;
1326 
1327 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
1328 		struct gotd_client *c, *tmp;
1329 
1330 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
1331 			disconnect(c);
1332 	}
1333 
1334 	proc = &gotd.listen_proc;
1335 	msgbuf_clear(&proc->iev.ibuf.w);
1336 	close(proc->iev.ibuf.fd);
1337 	kill_proc(proc, 0);
1338 	wait_for_child(proc->pid);
1339 
1340 	log_info("terminating");
1341 	exit(0);
1342 }
1343 
1344 void
1345 gotd_sighdlr(int sig, short event, void *arg)
1346 {
1347 	/*
1348 	 * Normal signal handler rules don't apply because libevent
1349 	 * decouples for us.
1350 	 */
1351 
1352 	switch (sig) {
1353 	case SIGHUP:
1354 		log_info("%s: ignoring SIGHUP", __func__);
1355 		break;
1356 	case SIGUSR1:
1357 		log_info("%s: ignoring SIGUSR1", __func__);
1358 		break;
1359 	case SIGTERM:
1360 	case SIGINT:
1361 		gotd_shutdown();
1362 		log_warnx("gotd terminating");
1363 		exit(0);
1364 		break;
1365 	default:
1366 		fatalx("unexpected signal");
1367 	}
1368 }
1369 
1370 static const struct got_error *
1371 ensure_proc_is_reading(struct gotd_client *client,
1372     struct gotd_child_proc *proc)
1373 {
1374 	if (!client_is_reading(client)) {
1375 		kill_proc(proc, 1);
1376 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1377 		    "PID %d handled a read-request for uid %d but this "
1378 		    "user is not reading from a repository", proc->pid,
1379 		    client->euid);
1380 	}
1381 
1382 	return NULL;
1383 }
1384 
1385 static const struct got_error *
1386 ensure_proc_is_writing(struct gotd_client *client,
1387     struct gotd_child_proc *proc)
1388 {
1389 	if (!client_is_writing(client)) {
1390 		kill_proc(proc, 1);
1391 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1392 		    "PID %d handled a write-request for uid %d but this "
1393 		    "user is not writing to a repository", proc->pid,
1394 		    client->euid);
1395 	}
1396 
1397 	return NULL;
1398 }
1399 
1400 static int
1401 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
1402     struct imsg *imsg)
1403 {
1404 	const struct got_error *err;
1405 	struct gotd_child_proc *client_proc;
1406 	int ret = 0;
1407 
1408 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
1409 		client_proc = get_client_proc(client);
1410 		if (client_proc == NULL)
1411 			fatalx("no process found for uid %d", client->euid);
1412 		if (proc->pid != client_proc->pid) {
1413 			kill_proc(proc, 1);
1414 			log_warnx("received message from PID %d for uid %d, "
1415 			    "while PID %d is the process serving this user",
1416 			    proc->pid, client->euid, client_proc->pid);
1417 			return 0;
1418 		}
1419 	}
1420 
1421 	switch (imsg->hdr.type) {
1422 	case GOTD_IMSG_ERROR:
1423 		ret = 1;
1424 		break;
1425 	case GOTD_IMSG_CONNECT:
1426 		if (proc->type != PROC_LISTEN) {
1427 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1428 			    "new connection for uid %d from PID %d "
1429 			    "which is not the listen process",
1430 			    proc->pid, client->euid);
1431 		} else
1432 			ret = 1;
1433 		break;
1434 	case GOTD_IMSG_ACCESS_GRANTED:
1435 		if (proc->type != PROC_AUTH) {
1436 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1437 			    "authentication of uid %d from PID %d "
1438 			    "which is not the auth process",
1439 			    proc->pid, client->euid);
1440 		} else
1441 			ret = 1;
1442 		break;
1443 	case GOTD_IMSG_REPO_CHILD_READY:
1444 		if (proc->type != PROC_REPO_READ &&
1445 		    proc->type != PROC_REPO_WRITE) {
1446 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1447 			    "unexpected \"ready\" signal from PID %d",
1448 			    proc->pid);
1449 		} else
1450 			ret = 1;
1451 		break;
1452 	case GOTD_IMSG_PACKFILE_DONE:
1453 		err = ensure_proc_is_reading(client, proc);
1454 		if (err)
1455 			log_warnx("uid %d: %s", client->euid, err->msg);
1456 		else
1457 			ret = 1;
1458 		break;
1459 	case GOTD_IMSG_PACKFILE_INSTALL:
1460 	case GOTD_IMSG_REF_UPDATES_START:
1461 	case GOTD_IMSG_REF_UPDATE:
1462 		err = ensure_proc_is_writing(client, proc);
1463 		if (err)
1464 			log_warnx("uid %d: %s", client->euid, err->msg);
1465 		else
1466 			ret = 1;
1467 		break;
1468 	default:
1469 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
1470 		break;
1471 	}
1472 
1473 	return ret;
1474 }
1475 
1476 static const struct got_error *
1477 list_refs_request(struct gotd_client *client, struct gotd_imsgev *iev)
1478 {
1479 	static const struct got_error *err;
1480 	struct gotd_imsg_list_refs_internal ilref;
1481 	int fd;
1482 
1483 	memset(&ilref, 0, sizeof(ilref));
1484 	ilref.client_id = client->id;
1485 
1486 	fd = dup(client->fd);
1487 	if (fd == -1)
1488 		return got_error_from_errno("dup");
1489 
1490 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_LIST_REFS_INTERNAL,
1491 	    PROC_GOTD, fd, &ilref, sizeof(ilref)) == -1) {
1492 		err = got_error_from_errno("imsg compose WANT");
1493 		close(fd);
1494 		return err;
1495 	}
1496 
1497 	client->state = GOTD_STATE_EXPECT_CAPABILITIES;
1498 	log_debug("uid %d: expecting capabilities", client->euid);
1499 	return NULL;
1500 }
1501 
1502 static const struct got_error *
1503 recv_packfile_done(uint32_t *client_id, struct imsg *imsg)
1504 {
1505 	struct gotd_imsg_packfile_done idone;
1506 	size_t datalen;
1507 
1508 	log_debug("packfile-done received");
1509 
1510 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1511 	if (datalen != sizeof(idone))
1512 		return got_error(GOT_ERR_PRIVSEP_LEN);
1513 	memcpy(&idone, imsg->data, sizeof(idone));
1514 
1515 	*client_id = idone.client_id;
1516 	return NULL;
1517 }
1518 
1519 static const struct got_error *
1520 recv_packfile_install(uint32_t *client_id, struct imsg *imsg)
1521 {
1522 	struct gotd_imsg_packfile_install inst;
1523 	size_t datalen;
1524 
1525 	log_debug("packfile-install received");
1526 
1527 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1528 	if (datalen != sizeof(inst))
1529 		return got_error(GOT_ERR_PRIVSEP_LEN);
1530 	memcpy(&inst, imsg->data, sizeof(inst));
1531 
1532 	*client_id = inst.client_id;
1533 	return NULL;
1534 }
1535 
1536 static const struct got_error *
1537 recv_ref_updates_start(uint32_t *client_id, struct imsg *imsg)
1538 {
1539 	struct gotd_imsg_ref_updates_start istart;
1540 	size_t datalen;
1541 
1542 	log_debug("ref-updates-start received");
1543 
1544 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1545 	if (datalen != sizeof(istart))
1546 		return got_error(GOT_ERR_PRIVSEP_LEN);
1547 	memcpy(&istart, imsg->data, sizeof(istart));
1548 
1549 	*client_id = istart.client_id;
1550 	return NULL;
1551 }
1552 
1553 static const struct got_error *
1554 recv_ref_update(uint32_t *client_id, struct imsg *imsg)
1555 {
1556 	struct gotd_imsg_ref_update iref;
1557 	size_t datalen;
1558 
1559 	log_debug("ref-update received");
1560 
1561 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1562 	if (datalen < sizeof(iref))
1563 		return got_error(GOT_ERR_PRIVSEP_LEN);
1564 	memcpy(&iref, imsg->data, sizeof(iref));
1565 
1566 	*client_id = iref.client_id;
1567 	return NULL;
1568 }
1569 
1570 static const struct got_error *
1571 send_ref_update_ok(struct gotd_client *client,
1572     struct gotd_imsg_ref_update *iref, const char *refname)
1573 {
1574 	struct gotd_imsg_ref_update_ok iok;
1575 	struct ibuf *wbuf;
1576 	size_t len;
1577 
1578 	memset(&iok, 0, sizeof(iok));
1579 	iok.client_id = client->id;
1580 	memcpy(iok.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1581 	memcpy(iok.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1582 	iok.name_len = strlen(refname);
1583 
1584 	len = sizeof(iok) + iok.name_len;
1585 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_OK,
1586 	    PROC_GOTD, gotd.pid, len);
1587 	if (wbuf == NULL)
1588 		return got_error_from_errno("imsg_create REF_UPDATE_OK");
1589 
1590 	if (imsg_add(wbuf, &iok, sizeof(iok)) == -1)
1591 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1592 	if (imsg_add(wbuf, refname, iok.name_len) == -1)
1593 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1594 
1595 	wbuf->fd = -1;
1596 	imsg_close(&client->iev.ibuf, wbuf);
1597 	gotd_imsg_event_add(&client->iev);
1598 	return NULL;
1599 }
1600 
1601 static void
1602 send_refs_updated(struct gotd_client *client)
1603 {
1604 	if (gotd_imsg_compose_event(&client->iev,
1605 	    GOTD_IMSG_REFS_UPDATED, PROC_GOTD, -1, NULL, 0) == -1)
1606 		log_warn("imsg compose REFS_UPDATED");
1607 }
1608 
1609 static const struct got_error *
1610 send_ref_update_ng(struct gotd_client *client,
1611     struct gotd_imsg_ref_update *iref, const char *refname,
1612     const char *reason)
1613 {
1614 	const struct got_error *ng_err;
1615 	struct gotd_imsg_ref_update_ng ing;
1616 	struct ibuf *wbuf;
1617 	size_t len;
1618 
1619 	memset(&ing, 0, sizeof(ing));
1620 	ing.client_id = client->id;
1621 	memcpy(ing.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1622 	memcpy(ing.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1623 	ing.name_len = strlen(refname);
1624 
1625 	ng_err = got_error_fmt(GOT_ERR_REF_BUSY, "%s", reason);
1626 	ing.reason_len = strlen(ng_err->msg);
1627 
1628 	len = sizeof(ing) + ing.name_len + ing.reason_len;
1629 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_NG,
1630 	    PROC_GOTD, gotd.pid, len);
1631 	if (wbuf == NULL)
1632 		return got_error_from_errno("imsg_create REF_UPDATE_NG");
1633 
1634 	if (imsg_add(wbuf, &ing, sizeof(ing)) == -1)
1635 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1636 	if (imsg_add(wbuf, refname, ing.name_len) == -1)
1637 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1638 	if (imsg_add(wbuf, ng_err->msg, ing.reason_len) == -1)
1639 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1640 
1641 	wbuf->fd = -1;
1642 	imsg_close(&client->iev.ibuf, wbuf);
1643 	gotd_imsg_event_add(&client->iev);
1644 	return NULL;
1645 }
1646 
1647 static const struct got_error *
1648 install_pack(struct gotd_client *client, const char *repo_path,
1649     struct imsg *imsg)
1650 {
1651 	const struct got_error *err = NULL;
1652 	struct gotd_imsg_packfile_install inst;
1653 	char hex[SHA1_DIGEST_STRING_LENGTH];
1654 	size_t datalen;
1655 	char *packfile_path = NULL, *packidx_path = NULL;
1656 
1657 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1658 	if (datalen != sizeof(inst))
1659 		return got_error(GOT_ERR_PRIVSEP_LEN);
1660 	memcpy(&inst, imsg->data, sizeof(inst));
1661 
1662 	if (client->packfile_path == NULL)
1663 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1664 		    "client has no pack file");
1665 	if (client->packidx_path == NULL)
1666 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1667 		    "client has no pack file index");
1668 
1669 	if (got_sha1_digest_to_str(inst.pack_sha1, hex, sizeof(hex)) == NULL)
1670 		return got_error_msg(GOT_ERR_NO_SPACE,
1671 		    "could not convert pack file SHA1 to hex");
1672 
1673 	if (asprintf(&packfile_path, "/%s/%s/pack-%s.pack",
1674 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1675 		err = got_error_from_errno("asprintf");
1676 		goto done;
1677 	}
1678 
1679 	if (asprintf(&packidx_path, "/%s/%s/pack-%s.idx",
1680 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1681 		err = got_error_from_errno("asprintf");
1682 		goto done;
1683 	}
1684 
1685 	if (rename(client->packfile_path, packfile_path) == -1) {
1686 		err = got_error_from_errno3("rename", client->packfile_path,
1687 		    packfile_path);
1688 		goto done;
1689 	}
1690 
1691 	free(client->packfile_path);
1692 	client->packfile_path = NULL;
1693 
1694 	if (rename(client->packidx_path, packidx_path) == -1) {
1695 		err = got_error_from_errno3("rename", client->packidx_path,
1696 		    packidx_path);
1697 		goto done;
1698 	}
1699 
1700 	free(client->packidx_path);
1701 	client->packidx_path = NULL;
1702 done:
1703 	free(packfile_path);
1704 	free(packidx_path);
1705 	return err;
1706 }
1707 
1708 static const struct got_error *
1709 begin_ref_updates(struct gotd_client *client, struct imsg *imsg)
1710 {
1711 	struct gotd_imsg_ref_updates_start istart;
1712 	size_t datalen;
1713 
1714 	if (client->nref_updates != -1)
1715 		return got_error(GOT_ERR_PRIVSEP_MSG);
1716 
1717 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1718 	if (datalen != sizeof(istart))
1719 		return got_error(GOT_ERR_PRIVSEP_LEN);
1720 	memcpy(&istart, imsg->data, sizeof(istart));
1721 
1722 	if (istart.nref_updates <= 0)
1723 		return got_error(GOT_ERR_PRIVSEP_MSG);
1724 
1725 	client->nref_updates = istart.nref_updates;
1726 	return NULL;
1727 }
1728 
1729 static const struct got_error *
1730 update_ref(struct gotd_client *client, const char *repo_path,
1731     struct imsg *imsg)
1732 {
1733 	const struct got_error *err = NULL;
1734 	struct got_repository *repo = NULL;
1735 	struct got_reference *ref = NULL;
1736 	struct gotd_imsg_ref_update iref;
1737 	struct got_object_id old_id, new_id;
1738 	struct got_object_id *id = NULL;
1739 	struct got_object *obj = NULL;
1740 	char *refname = NULL;
1741 	size_t datalen;
1742 	int locked = 0;
1743 
1744 	log_debug("update-ref from uid %d", client->euid);
1745 
1746 	if (client->nref_updates <= 0)
1747 		return got_error(GOT_ERR_PRIVSEP_MSG);
1748 
1749 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1750 	if (datalen < sizeof(iref))
1751 		return got_error(GOT_ERR_PRIVSEP_LEN);
1752 	memcpy(&iref, imsg->data, sizeof(iref));
1753 	if (datalen != sizeof(iref) + iref.name_len)
1754 		return got_error(GOT_ERR_PRIVSEP_LEN);
1755 	refname = malloc(iref.name_len + 1);
1756 	if (refname == NULL)
1757 		return got_error_from_errno("malloc");
1758 	memcpy(refname, imsg->data + sizeof(iref), iref.name_len);
1759 	refname[iref.name_len] = '\0';
1760 
1761 	log_debug("updating ref %s for uid %d", refname, client->euid);
1762 
1763 	err = got_repo_open(&repo, repo_path, NULL, NULL);
1764 	if (err)
1765 		goto done;
1766 
1767 	memcpy(old_id.sha1, iref.old_id, SHA1_DIGEST_LENGTH);
1768 	memcpy(new_id.sha1, iref.new_id, SHA1_DIGEST_LENGTH);
1769 	err = got_object_open(&obj, repo, &new_id);
1770 	if (err)
1771 		goto done;
1772 
1773 	if (iref.ref_is_new) {
1774 		err = got_ref_open(&ref, repo, refname, 0);
1775 		if (err) {
1776 			if (err->code != GOT_ERR_NOT_REF)
1777 				goto done;
1778 			err = got_ref_alloc(&ref, refname, &new_id);
1779 			if (err)
1780 				goto done;
1781 			err = got_ref_write(ref, repo); /* will lock/unlock */
1782 			if (err)
1783 				goto done;
1784 		} else {
1785 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1786 			    "%s has been created by someone else "
1787 			    "while transaction was in progress",
1788 			    got_ref_get_name(ref));
1789 			goto done;
1790 		}
1791 	} else {
1792 		err = got_ref_open(&ref, repo, refname, 1 /* lock */);
1793 		if (err)
1794 			goto done;
1795 		locked = 1;
1796 
1797 		err = got_ref_resolve(&id, repo, ref);
1798 		if (err)
1799 			goto done;
1800 
1801 		if (got_object_id_cmp(id, &old_id) != 0) {
1802 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1803 			    "%s has been modified by someone else "
1804 			    "while transaction was in progress",
1805 			    got_ref_get_name(ref));
1806 			goto done;
1807 		}
1808 
1809 		err = got_ref_change_ref(ref, &new_id);
1810 		if (err)
1811 			goto done;
1812 
1813 		err = got_ref_write(ref, repo);
1814 		if (err)
1815 			goto done;
1816 
1817 		free(id);
1818 		id = NULL;
1819 	}
1820 done:
1821 	if (err) {
1822 		if (err->code == GOT_ERR_LOCKFILE_TIMEOUT) {
1823 			err = got_error_fmt(GOT_ERR_LOCKFILE_TIMEOUT,
1824 			    "could not acquire exclusive file lock for %s",
1825 			    refname);
1826 		}
1827 		send_ref_update_ng(client, &iref, refname, err->msg);
1828 	} else
1829 		send_ref_update_ok(client, &iref, refname);
1830 
1831 	if (client->nref_updates > 0) {
1832 		client->nref_updates--;
1833 		if (client->nref_updates == 0)
1834 			send_refs_updated(client);
1835 
1836 	}
1837 	if (locked) {
1838 		const struct got_error *unlock_err;
1839 		unlock_err = got_ref_unlock(ref);
1840 		if (unlock_err && err == NULL)
1841 			err = unlock_err;
1842 	}
1843 	if (ref)
1844 		got_ref_close(ref);
1845 	if (obj)
1846 		got_object_close(obj);
1847 	if (repo)
1848 		got_repo_close(repo);
1849 	free(refname);
1850 	free(id);
1851 	return err;
1852 }
1853 
1854 static void
1855 gotd_dispatch_listener(int fd, short event, void *arg)
1856 {
1857 	struct gotd_imsgev *iev = arg;
1858 	struct imsgbuf *ibuf = &iev->ibuf;
1859 	struct gotd_child_proc *proc = &gotd.listen_proc;
1860 	ssize_t n;
1861 	int shut = 0;
1862 	struct imsg imsg;
1863 
1864 	if (proc->iev.ibuf.fd != fd)
1865 		fatalx("%s: unexpected fd %d", __func__, fd);
1866 
1867 	if (event & EV_READ) {
1868 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1869 			fatal("imsg_read error");
1870 		if (n == 0) {
1871 			/* Connection closed. */
1872 			shut = 1;
1873 			goto done;
1874 		}
1875 	}
1876 
1877 	if (event & EV_WRITE) {
1878 		n = msgbuf_write(&ibuf->w);
1879 		if (n == -1 && errno != EAGAIN)
1880 			fatal("msgbuf_write");
1881 		if (n == 0) {
1882 			/* Connection closed. */
1883 			shut = 1;
1884 			goto done;
1885 		}
1886 	}
1887 
1888 	for (;;) {
1889 		const struct got_error *err = NULL;
1890 		struct gotd_client *client = NULL;
1891 		uint32_t client_id = 0;
1892 		int do_disconnect = 0;
1893 
1894 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1895 			fatal("%s: imsg_get error", __func__);
1896 		if (n == 0)	/* No more messages. */
1897 			break;
1898 
1899 		switch (imsg.hdr.type) {
1900 		case GOTD_IMSG_ERROR:
1901 			do_disconnect = 1;
1902 			err = gotd_imsg_recv_error(&client_id, &imsg);
1903 			break;
1904 		case GOTD_IMSG_CONNECT:
1905 			err = recv_connect(&client_id, &imsg);
1906 			break;
1907 		default:
1908 			log_debug("unexpected imsg %d", imsg.hdr.type);
1909 			break;
1910 		}
1911 
1912 		client = find_client(client_id);
1913 		if (client == NULL) {
1914 			log_warnx("%s: client not found", __func__);
1915 			imsg_free(&imsg);
1916 			continue;
1917 		}
1918 
1919 		if (err)
1920 			log_warnx("uid %d: %s", client->euid, err->msg);
1921 
1922 		if (do_disconnect) {
1923 			if (err)
1924 				disconnect_on_error(client, err);
1925 			else
1926 				disconnect(client);
1927 		}
1928 
1929 		imsg_free(&imsg);
1930 	}
1931 done:
1932 	if (!shut) {
1933 		gotd_imsg_event_add(iev);
1934 	} else {
1935 		/* This pipe is dead. Remove its event handler */
1936 		event_del(&iev->ev);
1937 		event_loopexit(NULL);
1938 	}
1939 }
1940 
1941 static void
1942 gotd_dispatch_auth_child(int fd, short event, void *arg)
1943 {
1944 	const struct got_error *err = NULL;
1945 	struct gotd_imsgev *iev = arg;
1946 	struct imsgbuf *ibuf = &iev->ibuf;
1947 	struct gotd_client *client;
1948 	struct gotd_repo *repo = NULL;
1949 	ssize_t n;
1950 	int shut = 0;
1951 	struct imsg imsg;
1952 	uint32_t client_id = 0;
1953 	int do_disconnect = 0;
1954 	enum gotd_procid proc_type;
1955 
1956 	client = find_client_by_proc_fd(fd);
1957 	if (client == NULL)
1958 		fatalx("cannot find client for fd %d", fd);
1959 
1960 	if (client->auth == NULL)
1961 		fatalx("cannot find auth child process for fd %d", fd);
1962 
1963 	if (event & EV_READ) {
1964 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1965 			fatal("imsg_read error");
1966 		if (n == 0) {
1967 			/* Connection closed. */
1968 			shut = 1;
1969 			goto done;
1970 		}
1971 	}
1972 
1973 	if (event & EV_WRITE) {
1974 		n = msgbuf_write(&ibuf->w);
1975 		if (n == -1 && errno != EAGAIN)
1976 			fatal("msgbuf_write");
1977 		if (n == 0) {
1978 			/* Connection closed. */
1979 			shut = 1;
1980 		}
1981 		goto done;
1982 	}
1983 
1984 	if (client->auth->iev.ibuf.fd != fd)
1985 		fatalx("%s: unexpected fd %d", __func__, fd);
1986 
1987 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1988 		fatal("%s: imsg_get error", __func__);
1989 	if (n == 0)	/* No more messages. */
1990 		return;
1991 
1992 	evtimer_del(&client->tmo);
1993 
1994 	switch (imsg.hdr.type) {
1995 	case GOTD_IMSG_ERROR:
1996 		do_disconnect = 1;
1997 		err = gotd_imsg_recv_error(&client_id, &imsg);
1998 		break;
1999 	case GOTD_IMSG_ACCESS_GRANTED:
2000 		break;
2001 	default:
2002 		do_disconnect = 1;
2003 		log_debug("unexpected imsg %d", imsg.hdr.type);
2004 		break;
2005 	}
2006 
2007 	if (!verify_imsg_src(client, client->auth, &imsg)) {
2008 		do_disconnect = 1;
2009 		log_debug("dropping imsg type %d from PID %d",
2010 		    imsg.hdr.type, client->auth->pid);
2011 	}
2012 	imsg_free(&imsg);
2013 
2014 	if (do_disconnect) {
2015 		if (err)
2016 			disconnect_on_error(client, err);
2017 		else
2018 			disconnect(client);
2019 		goto done;
2020 	}
2021 
2022 	repo = find_repo_by_name(client->auth->repo_name);
2023 	if (repo == NULL) {
2024 		err = got_error(GOT_ERR_NOT_GIT_REPO);
2025 		goto done;
2026 	}
2027 	kill_auth_proc(client);
2028 
2029 	log_info("authenticated uid %d for repository %s\n",
2030 	    client->euid, repo->name);
2031 
2032 	if (client->required_auth & GOTD_AUTH_WRITE)
2033 		proc_type = PROC_REPO_WRITE;
2034 	else
2035 		proc_type = PROC_REPO_READ;
2036 
2037 	err = start_repo_child(client, proc_type, repo,
2038 		gotd.argv0, gotd.confpath, gotd.daemonize,
2039 		gotd.verbosity);
2040 done:
2041 	if (err)
2042 		log_warnx("uid %d: %s", client->euid, err->msg);
2043 
2044 	/* We might have killed the auth process by now. */
2045 	if (client->auth != NULL) {
2046 		if (!shut) {
2047 			gotd_imsg_event_add(iev);
2048 		} else {
2049 			/* This pipe is dead. Remove its event handler */
2050 			event_del(&iev->ev);
2051 		}
2052 	}
2053 }
2054 
2055 static void
2056 gotd_dispatch_repo_child(int fd, short event, void *arg)
2057 {
2058 	struct gotd_imsgev *iev = arg;
2059 	struct imsgbuf *ibuf = &iev->ibuf;
2060 	struct gotd_child_proc *proc = NULL;
2061 	struct gotd_client *client = NULL;
2062 	ssize_t n;
2063 	int shut = 0;
2064 	struct imsg imsg;
2065 
2066 	if (event & EV_READ) {
2067 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
2068 			fatal("imsg_read error");
2069 		if (n == 0) {
2070 			/* Connection closed. */
2071 			shut = 1;
2072 			goto done;
2073 		}
2074 	}
2075 
2076 	if (event & EV_WRITE) {
2077 		n = msgbuf_write(&ibuf->w);
2078 		if (n == -1 && errno != EAGAIN)
2079 			fatal("msgbuf_write");
2080 		if (n == 0) {
2081 			/* Connection closed. */
2082 			shut = 1;
2083 			goto done;
2084 		}
2085 	}
2086 
2087 	client = find_client_by_proc_fd(fd);
2088 	if (client == NULL)
2089 		fatalx("cannot find client for fd %d", fd);
2090 
2091 	proc = get_client_proc(client);
2092 	if (proc == NULL)
2093 		fatalx("cannot find child process for fd %d", fd);
2094 
2095 	for (;;) {
2096 		const struct got_error *err = NULL;
2097 		uint32_t client_id = 0;
2098 		int do_disconnect = 0;
2099 		int do_list_refs = 0, do_ref_updates = 0, do_ref_update = 0;
2100 		int do_packfile_install = 0;
2101 
2102 		if ((n = imsg_get(ibuf, &imsg)) == -1)
2103 			fatal("%s: imsg_get error", __func__);
2104 		if (n == 0)	/* No more messages. */
2105 			break;
2106 
2107 		switch (imsg.hdr.type) {
2108 		case GOTD_IMSG_ERROR:
2109 			do_disconnect = 1;
2110 			err = gotd_imsg_recv_error(&client_id, &imsg);
2111 			break;
2112 		case GOTD_IMSG_REPO_CHILD_READY:
2113 			do_list_refs = 1;
2114 			break;
2115 		case GOTD_IMSG_PACKFILE_DONE:
2116 			do_disconnect = 1;
2117 			err = recv_packfile_done(&client_id, &imsg);
2118 			break;
2119 		case GOTD_IMSG_PACKFILE_INSTALL:
2120 			err = recv_packfile_install(&client_id, &imsg);
2121 			if (err == NULL)
2122 				do_packfile_install = 1;
2123 			break;
2124 		case GOTD_IMSG_REF_UPDATES_START:
2125 			err = recv_ref_updates_start(&client_id, &imsg);
2126 			if (err == NULL)
2127 				do_ref_updates = 1;
2128 			break;
2129 		case GOTD_IMSG_REF_UPDATE:
2130 			err = recv_ref_update(&client_id, &imsg);
2131 			if (err == NULL)
2132 				do_ref_update = 1;
2133 			break;
2134 		default:
2135 			log_debug("unexpected imsg %d", imsg.hdr.type);
2136 			break;
2137 		}
2138 
2139 		if (!verify_imsg_src(client, proc, &imsg)) {
2140 			log_debug("dropping imsg type %d from PID %d",
2141 			    imsg.hdr.type, proc->pid);
2142 			imsg_free(&imsg);
2143 			continue;
2144 		}
2145 		if (err)
2146 			log_warnx("uid %d: %s", client->euid, err->msg);
2147 
2148 		if (do_disconnect) {
2149 			if (err)
2150 				disconnect_on_error(client, err);
2151 			else
2152 				disconnect(client);
2153 		} else {
2154 			if (do_list_refs)
2155 				err = list_refs_request(client, iev);
2156 			else if (do_packfile_install)
2157 				err = install_pack(client, proc->repo_path,
2158 				    &imsg);
2159 			else if (do_ref_updates)
2160 				err = begin_ref_updates(client, &imsg);
2161 			else if (do_ref_update)
2162 				err = update_ref(client, proc->repo_path,
2163 				    &imsg);
2164 			if (err)
2165 				log_warnx("uid %d: %s", client->euid, err->msg);
2166 		}
2167 		imsg_free(&imsg);
2168 	}
2169 done:
2170 	if (!shut) {
2171 		gotd_imsg_event_add(iev);
2172 	} else {
2173 		/* This pipe is dead. Remove its event handler */
2174 		event_del(&iev->ev);
2175 		event_loopexit(NULL);
2176 	}
2177 }
2178 
2179 static pid_t
2180 start_child(enum gotd_procid proc_id, const char *repo_path,
2181     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
2182 {
2183 	char	*argv[11];
2184 	int	 argc = 0;
2185 	pid_t	 pid;
2186 
2187 	switch (pid = fork()) {
2188 	case -1:
2189 		fatal("cannot fork");
2190 	case 0:
2191 		break;
2192 	default:
2193 		close(fd);
2194 		return pid;
2195 	}
2196 
2197 	if (fd != GOTD_FILENO_MSG_PIPE) {
2198 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
2199 			fatal("cannot setup imsg fd");
2200 	} else if (fcntl(fd, F_SETFD, 0) == -1)
2201 		fatal("cannot setup imsg fd");
2202 
2203 	argv[argc++] = argv0;
2204 	switch (proc_id) {
2205 	case PROC_LISTEN:
2206 		argv[argc++] = (char *)"-L";
2207 		break;
2208 	case PROC_AUTH:
2209 		argv[argc++] = (char *)"-A";
2210 		break;
2211 	case PROC_REPO_READ:
2212 		argv[argc++] = (char *)"-R";
2213 		break;
2214 	case PROC_REPO_WRITE:
2215 		argv[argc++] = (char *)"-W";
2216 		break;
2217 	default:
2218 		fatalx("invalid process id %d", proc_id);
2219 	}
2220 
2221 	argv[argc++] = (char *)"-f";
2222 	argv[argc++] = (char *)confpath;
2223 
2224 	if (repo_path) {
2225 		argv[argc++] = (char *)"-P";
2226 		argv[argc++] = (char *)repo_path;
2227 	}
2228 
2229 	if (!daemonize)
2230 		argv[argc++] = (char *)"-d";
2231 	if (verbosity > 0)
2232 		argv[argc++] = (char *)"-v";
2233 	if (verbosity > 1)
2234 		argv[argc++] = (char *)"-v";
2235 	argv[argc++] = NULL;
2236 
2237 	execvp(argv0, argv);
2238 	fatal("execvp");
2239 }
2240 
2241 static void
2242 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
2243 {
2244 	struct gotd_child_proc *proc = &gotd.listen_proc;
2245 
2246 	proc->type = PROC_LISTEN;
2247 
2248 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2249 	    PF_UNSPEC, proc->pipe) == -1)
2250 		fatal("socketpair");
2251 
2252 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
2253 	    proc->pipe[1], daemonize, verbosity);
2254 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2255 	proc->iev.handler = gotd_dispatch_listener;
2256 	proc->iev.events = EV_READ;
2257 	proc->iev.handler_arg = NULL;
2258 }
2259 
2260 static const struct got_error *
2261 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
2262     struct gotd_repo *repo, char *argv0, const char *confpath,
2263     int daemonize, int verbosity)
2264 {
2265 	struct gotd_child_proc *proc;
2266 
2267 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
2268 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
2269 		
2270 	proc = calloc(1, sizeof(*proc));
2271 	if (proc == NULL)
2272 		return got_error_from_errno("calloc");
2273 
2274 	proc->type = proc_type;
2275 	if (strlcpy(proc->repo_name, repo->name,
2276 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2277 		fatalx("repository name too long: %s", repo->name);
2278 	log_debug("starting %s for repository %s",
2279 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
2280 	if (realpath(repo->path, proc->repo_path) == NULL)
2281 		fatal("%s", repo->path);
2282 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2283 	    PF_UNSPEC, proc->pipe) == -1)
2284 		fatal("socketpair");
2285 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2286 	    confpath, proc->pipe[1], daemonize, verbosity);
2287 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2288 	log_debug("proc %s %s is on fd %d",
2289 	    gotd_proc_names[proc->type], proc->repo_path,
2290 	    proc->pipe[0]);
2291 	proc->iev.handler = gotd_dispatch_repo_child;
2292 	proc->iev.events = EV_READ;
2293 	proc->iev.handler_arg = NULL;
2294 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2295 	    gotd_dispatch_repo_child, &proc->iev);
2296 	gotd_imsg_event_add(&proc->iev);
2297 
2298 	if (proc->type == PROC_REPO_READ)
2299 		client->repo_read = proc;
2300 	else
2301 		client->repo_write = proc;
2302 
2303 	return NULL;
2304 }
2305 
2306 static const struct got_error *
2307 start_auth_child(struct gotd_client *client, int required_auth,
2308     struct gotd_repo *repo, char *argv0, const char *confpath,
2309     int daemonize, int verbosity)
2310 {
2311 	struct gotd_child_proc *proc;
2312 	struct gotd_imsg_auth iauth;
2313 
2314 	memset(&iauth, 0, sizeof(iauth));
2315 
2316 	proc = calloc(1, sizeof(*proc));
2317 	if (proc == NULL)
2318 		return got_error_from_errno("calloc");
2319 
2320 	proc->type = PROC_AUTH;
2321 	if (strlcpy(proc->repo_name, repo->name,
2322 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2323 		fatalx("repository name too long: %s", repo->name);
2324 	log_debug("starting auth for uid %d repository %s",
2325 	    client->euid, repo->name);
2326 	if (realpath(repo->path, proc->repo_path) == NULL)
2327 		fatal("%s", repo->path);
2328 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2329 	    PF_UNSPEC, proc->pipe) == -1)
2330 		fatal("socketpair");
2331 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2332 	    confpath, proc->pipe[1], daemonize, verbosity);
2333 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2334 	log_debug("proc %s %s is on fd %d",
2335 	    gotd_proc_names[proc->type], proc->repo_path,
2336 	    proc->pipe[0]);
2337 	proc->iev.handler = gotd_dispatch_auth_child;
2338 	proc->iev.events = EV_READ;
2339 	proc->iev.handler_arg = NULL;
2340 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2341 	    gotd_dispatch_auth_child, &proc->iev);
2342 	gotd_imsg_event_add(&proc->iev);
2343 
2344 	iauth.euid = client->euid;
2345 	iauth.egid = client->egid;
2346 	iauth.required_auth = required_auth;
2347 	iauth.client_id = client->id;
2348 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
2349 	    PROC_GOTD, -1, &iauth, sizeof(iauth)) == -1)
2350 		log_warn("imsg compose AUTHENTICATE");
2351 
2352 	client->auth = proc;
2353 	client->required_auth = required_auth;
2354 	return NULL;
2355 }
2356 
2357 static void
2358 apply_unveil_repo_readonly(const char *repo_path)
2359 {
2360 	if (unveil(repo_path, "r") == -1)
2361 		fatal("unveil %s", repo_path);
2362 
2363 	if (unveil(NULL, NULL) == -1)
2364 		fatal("unveil");
2365 }
2366 
2367 static void
2368 apply_unveil(void)
2369 {
2370 	struct gotd_repo *repo;
2371 
2372 	if (unveil(gotd.argv0, "x") == -1)
2373 		fatal("unveil %s", gotd.argv0);
2374 
2375 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
2376 		if (unveil(repo->path, "rwc") == -1)
2377 			fatal("unveil %s", repo->path);
2378 	}
2379 
2380 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
2381 		fatal("unveil %s", GOT_TMPDIR_STR);
2382 
2383 	if (unveil(NULL, NULL) == -1)
2384 		fatal("unveil");
2385 }
2386 
2387 int
2388 main(int argc, char **argv)
2389 {
2390 	const struct got_error *error = NULL;
2391 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
2392 	const char *confpath = GOTD_CONF_PATH;
2393 	char *argv0 = argv[0];
2394 	char title[2048];
2395 	gid_t groups[NGROUPS_MAX];
2396 	int ngroups = NGROUPS_MAX;
2397 	struct passwd *pw = NULL;
2398 	struct group *gr = NULL;
2399 	char *repo_path = NULL;
2400 	enum gotd_procid proc_id = PROC_GOTD;
2401 	struct event evsigint, evsigterm, evsighup, evsigusr1;
2402 	int *pack_fds = NULL, *temp_fds = NULL;
2403 
2404 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
2405 
2406 	while ((ch = getopt(argc, argv, "Adf:LnP:RvW")) != -1) {
2407 		switch (ch) {
2408 		case 'A':
2409 			proc_id = PROC_AUTH;
2410 			break;
2411 		case 'd':
2412 			daemonize = 0;
2413 			break;
2414 		case 'f':
2415 			confpath = optarg;
2416 			break;
2417 		case 'L':
2418 			proc_id = PROC_LISTEN;
2419 			break;
2420 		case 'n':
2421 			noaction = 1;
2422 			break;
2423 		case 'P':
2424 			repo_path = realpath(optarg, NULL);
2425 			if (repo_path == NULL)
2426 				fatal("realpath '%s'", optarg);
2427 			break;
2428 		case 'R':
2429 			proc_id = PROC_REPO_READ;
2430 			break;
2431 		case 'v':
2432 			if (verbosity < 3)
2433 				verbosity++;
2434 			break;
2435 		case 'W':
2436 			proc_id = PROC_REPO_WRITE;
2437 			break;
2438 		default:
2439 			usage();
2440 		}
2441 	}
2442 
2443 	argc -= optind;
2444 	argv += optind;
2445 
2446 	if (argc != 0)
2447 		usage();
2448 
2449 	/* Require an absolute path in argv[0] for reliable re-exec. */
2450 	if (!got_path_is_absolute(argv0))
2451 		fatalx("bad path \"%s\": must be an absolute path", argv0);
2452 
2453 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
2454 		fatalx("need root privileges");
2455 
2456 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
2457 	log_setverbose(verbosity);
2458 
2459 	if (parse_config(confpath, proc_id, &gotd) != 0)
2460 		return 1;
2461 
2462 	gotd.argv0 = argv0;
2463 	gotd.daemonize = daemonize;
2464 	gotd.verbosity = verbosity;
2465 	gotd.confpath = confpath;
2466 
2467 	if (proc_id == PROC_GOTD &&
2468 	    (gotd.nrepos == 0 || TAILQ_EMPTY(&gotd.repos)))
2469 		fatalx("no repository defined in configuration file");
2470 
2471 	pw = getpwnam(gotd.user_name);
2472 	if (pw == NULL)
2473 		fatalx("user %s not found", gotd.user_name);
2474 
2475 	if (pw->pw_uid == 0) {
2476 		fatalx("cannot run %s as %s: the user running %s "
2477 		    "must not be the superuser",
2478 		    getprogname(), pw->pw_name, getprogname());
2479 	}
2480 
2481 	if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1)
2482 		log_warnx("group membership list truncated");
2483 
2484 	gr = match_group(groups, ngroups, gotd.unix_group_name);
2485 	if (gr == NULL) {
2486 		fatalx("cannot start %s: the user running %s "
2487 		    "must be a secondary member of group %s",
2488 		    getprogname(), getprogname(), gotd.unix_group_name);
2489 	}
2490 	if (gr->gr_gid == pw->pw_gid) {
2491 		fatalx("cannot start %s: the user running %s "
2492 		    "must be a secondary member of group %s, but "
2493 		    "%s is the user's primary group",
2494 		    getprogname(), getprogname(), gotd.unix_group_name,
2495 		    gotd.unix_group_name);
2496 	}
2497 
2498 	if (proc_id == PROC_LISTEN &&
2499 	    !got_path_is_absolute(gotd.unix_socket_path))
2500 		fatalx("bad unix socket path \"%s\": must be an absolute path",
2501 		    gotd.unix_socket_path);
2502 
2503 	if (noaction)
2504 		return 0;
2505 
2506 	if (proc_id == PROC_GOTD) {
2507 		gotd.pid = getpid();
2508 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2509 		start_listener(argv0, confpath, daemonize, verbosity);
2510 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
2511 		if (daemonize && daemon(1, 0) == -1)
2512 			fatal("daemon");
2513 	} else if (proc_id == PROC_LISTEN) {
2514 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2515 		if (verbosity) {
2516 			log_info("socket: %s", gotd.unix_socket_path);
2517 			log_info("user: %s", pw->pw_name);
2518 			log_info("secondary group: %s", gr->gr_name);
2519 		}
2520 
2521 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
2522 		    gr->gr_gid);
2523 		if (fd == -1) {
2524 			fatal("cannot listen on unix socket %s",
2525 			    gotd.unix_socket_path);
2526 		}
2527 		if (daemonize && daemon(0, 0) == -1)
2528 			fatal("daemon");
2529 	} else if (proc_id == PROC_AUTH) {
2530 		snprintf(title, sizeof(title), "%s %s",
2531 		    gotd_proc_names[proc_id], repo_path);
2532 		if (daemonize && daemon(0, 0) == -1)
2533 			fatal("daemon");
2534 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE) {
2535 		error = got_repo_pack_fds_open(&pack_fds);
2536 		if (error != NULL)
2537 			fatalx("cannot open pack tempfiles: %s", error->msg);
2538 		error = got_repo_temp_fds_open(&temp_fds);
2539 		if (error != NULL)
2540 			fatalx("cannot open pack tempfiles: %s", error->msg);
2541 		if (repo_path == NULL)
2542 			fatalx("repository path not specified");
2543 		snprintf(title, sizeof(title), "%s %s",
2544 		    gotd_proc_names[proc_id], repo_path);
2545 		if (daemonize && daemon(0, 0) == -1)
2546 			fatal("daemon");
2547 	} else
2548 		fatal("invalid process id %d", proc_id);
2549 
2550 	setproctitle("%s", title);
2551 	log_procinit(title);
2552 
2553 	/* Drop root privileges. */
2554 	if (setgid(pw->pw_gid) == -1)
2555 		fatal("setgid %d failed", pw->pw_gid);
2556 	if (setuid(pw->pw_uid) == -1)
2557 		fatal("setuid %d failed", pw->pw_uid);
2558 
2559 	event_init();
2560 
2561 	switch (proc_id) {
2562 	case PROC_GOTD:
2563 #ifndef PROFILE
2564 		if (pledge("stdio rpath wpath cpath proc exec "
2565 		    "sendfd recvfd fattr flock unix unveil", NULL) == -1)
2566 			err(1, "pledge");
2567 #endif
2568 		break;
2569 	case PROC_LISTEN:
2570 #ifndef PROFILE
2571 		if (pledge("stdio sendfd unix", NULL) == -1)
2572 			err(1, "pledge");
2573 #endif
2574 		listen_main(title, fd);
2575 		/* NOTREACHED */
2576 		break;
2577 	case PROC_AUTH:
2578 #ifndef PROFILE
2579 		if (pledge("stdio getpw", NULL) == -1)
2580 			err(1, "pledge");
2581 #endif
2582 		auth_main(title, &gotd.repos, repo_path);
2583 		/* NOTREACHED */
2584 		break;
2585 	case PROC_REPO_READ:
2586 #ifndef PROFILE
2587 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2588 			err(1, "pledge");
2589 #endif
2590 		apply_unveil_repo_readonly(repo_path);
2591 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2592 		/* NOTREACHED */
2593 		exit(0);
2594 	case PROC_REPO_WRITE:
2595 #ifndef PROFILE
2596 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2597 			err(1, "pledge");
2598 #endif
2599 		apply_unveil_repo_readonly(repo_path);
2600 		repo_write_main(title, repo_path, pack_fds, temp_fds);
2601 		/* NOTREACHED */
2602 		exit(0);
2603 	default:
2604 		fatal("invalid process id %d", proc_id);
2605 	}
2606 
2607 	if (proc_id != PROC_GOTD)
2608 		fatal("invalid process id %d", proc_id);
2609 
2610 	apply_unveil();
2611 
2612 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2613 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2614 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2615 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2616 	signal(SIGPIPE, SIG_IGN);
2617 
2618 	signal_add(&evsigint, NULL);
2619 	signal_add(&evsigterm, NULL);
2620 	signal_add(&evsighup, NULL);
2621 	signal_add(&evsigusr1, NULL);
2622 
2623 	gotd_imsg_event_add(&gotd.listen_proc.iev);
2624 
2625 	event_dispatch();
2626 
2627 	if (pack_fds)
2628 		got_repo_pack_fds_close(pack_fds);
2629 	free(repo_path);
2630 	return 0;
2631 }