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Date:: Fri Dec 30 14:58:04 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 	if (gotd_imsg_compose_event(&client->repo_write->iev,
906 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
907 	        &ipipe, sizeof(ipipe)) == -1) {
908 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
909 		pipe[0] = -1;
910 		goto done;
911 	}
912 	pipe[0] = -1;
913 
914 	if (gotd_imsg_compose_event(&client->repo_write->iev,
915 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1],
916 	        &ipipe, sizeof(ipipe)) == -1)
917 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
918 	pipe[1] = -1;
919 
920 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.pack",
921 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
922 	    client->euid) == -1) {
923 		err = got_error_from_errno("asprintf");
924 		goto done;
925 	}
926 
927 	err = got_opentemp_named_fd(&pack_path, &packfd, basepath, "");
928 	if (err)
929 		goto done;
930 
931 	free(basepath);
932 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.idx",
933 	    client->repo_write->repo_path, GOT_OBJECTS_PACK_DIR,
934 	    client->euid) == -1) {
935 		err = got_error_from_errno("asprintf");
936 		basepath = NULL;
937 		goto done;
938 	}
939 	err = got_opentemp_named_fd(&idx_path, &idxfd, basepath, "");
940 	if (err)
941 		goto done;
942 
943 	memset(&ifile, 0, sizeof(ifile));
944 	ifile.client_id = client->id;
945 	if (gotd_imsg_compose_event(&client->repo_write->iev,
946 	    GOTD_IMSG_PACKIDX_FILE, PROC_GOTD, idxfd,
947 	    &ifile, sizeof(ifile)) == -1) {
948 		err = got_error_from_errno("imsg compose PACKIDX_FILE");
949 		idxfd = -1;
950 		goto done;
951 	}
952 	idxfd = -1;
953 
954 	memset(&ipack, 0, sizeof(ipack));
955 	ipack.client_id = client->id;
956 	if (client_has_capability(client, GOT_CAPA_REPORT_STATUS))
957 		ipack.report_status = 1;
958 
959 	if (gotd_imsg_compose_event(&client->repo_write->iev,
960 	    GOTD_IMSG_RECV_PACKFILE, PROC_GOTD, packfd,
961 	    &ipack, sizeof(ipack)) == -1) {
962 		err = got_error_from_errno("imsg compose RECV_PACKFILE");
963 		packfd = -1;
964 		goto done;
965 	}
966 	packfd = -1;
967 
968 done:
969 	free(basepath);
970 	if (pipe[0] != -1 && close(pipe[0]) == -1 && err == NULL)
971 		err = got_error_from_errno("close");
972 	if (pipe[1] != -1 && close(pipe[1]) == -1 && err == NULL)
973 		err = got_error_from_errno("close");
974 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
975 		err = got_error_from_errno("close");
976 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
977 		err = got_error_from_errno("close");
978 	if (err) {
979 		free(pack_path);
980 		free(idx_path);
981 	} else {
982 		client->packfile_path = pack_path;
983 		client->packidx_path = idx_path;
984 	}
985 	return err;
986 }
987 
988 static void
989 gotd_request(int fd, short events, void *arg)
990 {
991 	struct gotd_imsgev *iev = arg;
992 	struct imsgbuf *ibuf = &iev->ibuf;
993 	struct gotd_client *client = iev->handler_arg;
994 	const struct got_error *err = NULL;
995 	struct imsg imsg;
996 	ssize_t n;
997 
998 	if (events & EV_WRITE) {
999 		while (ibuf->w.queued) {
1000 			n = msgbuf_write(&ibuf->w);
1001 			if (n == -1 && errno == EPIPE) {
1002 				/*
1003 				 * The client has closed its socket.
1004 				 * This can happen when Git clients are
1005 				 * done sending pack file data.
1006 				*/
1007 				msgbuf_clear(&ibuf->w);
1008 				continue;
1009 			} else if (n == -1 && errno != EAGAIN) {
1010 				err = got_error_from_errno("imsg_flush");
1011 				disconnect_on_error(client, err);
1012 				return;
1013 			}
1014 			if (n == 0) {
1015 				/* Connection closed. */
1016 				err = got_error(GOT_ERR_EOF);
1017 				disconnect_on_error(client, err);
1018 				return;
1019 			}
1020 		}
1021 
1022 		/* Disconnect gotctl(8) now that messages have been sent. */
1023 		if (!client_is_reading(client) && !client_is_writing(client)) {
1024 			disconnect(client);
1025 			return;
1026 		}
1027 	}
1028 
1029 	if ((events & EV_READ) == 0)
1030 		return;
1031 
1032 	memset(&imsg, 0, sizeof(imsg));
1033 
1034 	while (err == NULL) {
1035 		err = gotd_imsg_recv(&imsg, ibuf, 0);
1036 		if (err) {
1037 			if (err->code == GOT_ERR_PRIVSEP_READ)
1038 				err = NULL;
1039 			break;
1040 		}
1041 
1042 		evtimer_del(&client->tmo);
1043 
1044 		switch (imsg.hdr.type) {
1045 		case GOTD_IMSG_INFO:
1046 			err = send_info(client);
1047 			break;
1048 		case GOTD_IMSG_STOP:
1049 			err = stop_gotd(client);
1050 			break;
1051 		case GOTD_IMSG_LIST_REFS:
1052 			if (client->state != GOTD_STATE_EXPECT_LIST_REFS) {
1053 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1054 				    "unexpected list-refs request received");
1055 				break;
1056 			}
1057 			err = start_client_session(client, &imsg);
1058 			if (err)
1059 				break;
1060 			break;
1061 		case GOTD_IMSG_CAPABILITIES:
1062 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1063 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1064 				    "unexpected capabilities received");
1065 				break;
1066 			}
1067 			log_debug("receiving capabilities from uid %d",
1068 			    client->euid);
1069 			err = recv_capabilities(client, &imsg);
1070 			break;
1071 		case GOTD_IMSG_CAPABILITY:
1072 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1073 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1074 				    "unexpected capability received");
1075 				break;
1076 			}
1077 			err = recv_capability(client, &imsg);
1078 			if (err || client->ncapabilities < client->ncapa_alloc)
1079 				break;
1080 			if (client_is_reading(client)) {
1081 				client->state = GOTD_STATE_EXPECT_WANT;
1082 				log_debug("uid %d: expecting want-lines",
1083 				    client->euid);
1084 			} else if (client_is_writing(client)) {
1085 				client->state = GOTD_STATE_EXPECT_REF_UPDATE;
1086 				log_debug("uid %d: expecting ref-update-lines",
1087 				    client->euid);
1088 			} else
1089 				fatalx("client %d is both reading and writing",
1090 				    client->euid);
1091 			break;
1092 		case GOTD_IMSG_WANT:
1093 			if (client->state != GOTD_STATE_EXPECT_WANT) {
1094 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1095 				    "unexpected want-line received");
1096 				break;
1097 			}
1098 			log_debug("received want-line from uid %d",
1099 			    client->euid);
1100 			err = ensure_client_is_reading(client);
1101 			if (err)
1102 				break;
1103 			err = forward_want(client, &imsg);
1104 			break;
1105 		case GOTD_IMSG_REF_UPDATE:
1106 			if (client->state != GOTD_STATE_EXPECT_REF_UPDATE) {
1107 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1108 				    "unexpected ref-update-line received");
1109 				break;
1110 			}
1111 			log_debug("received ref-update-line from uid %d",
1112 			    client->euid);
1113 			err = ensure_client_is_writing(client);
1114 			if (err)
1115 				break;
1116 			err = forward_ref_update(client, &imsg);
1117 			if (err)
1118 				break;
1119 			client->state = GOTD_STATE_EXPECT_MORE_REF_UPDATES;
1120 			break;
1121 		case GOTD_IMSG_HAVE:
1122 			if (client->state != GOTD_STATE_EXPECT_HAVE) {
1123 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1124 				    "unexpected have-line received");
1125 				break;
1126 			}
1127 			log_debug("received have-line from uid %d",
1128 			    client->euid);
1129 			err = ensure_client_is_reading(client);
1130 			if (err)
1131 				break;
1132 			err = forward_have(client, &imsg);
1133 			if (err)
1134 				break;
1135 			break;
1136 		case GOTD_IMSG_FLUSH:
1137 			if (client->state == GOTD_STATE_EXPECT_WANT ||
1138 			    client->state == GOTD_STATE_EXPECT_HAVE) {
1139 				err = ensure_client_is_reading(client);
1140 				if (err)
1141 					break;
1142 			} else if (client->state ==
1143 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1144 				err = ensure_client_is_writing(client);
1145 				if (err)
1146 					break;
1147 			} else {
1148 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1149 				    "unexpected flush-pkt received");
1150 				break;
1151 			}
1152 			log_debug("received flush-pkt from uid %d",
1153 			    client->euid);
1154 			if (client->state == GOTD_STATE_EXPECT_WANT) {
1155 				client->state = GOTD_STATE_EXPECT_HAVE;
1156 				log_debug("uid %d: expecting have-lines",
1157 				    client->euid);
1158 			} else if (client->state == GOTD_STATE_EXPECT_HAVE) {
1159 				client->state = GOTD_STATE_EXPECT_DONE;
1160 				log_debug("uid %d: expecting 'done'",
1161 				    client->euid);
1162 			} else if (client->state ==
1163 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1164 				client->state = GOTD_STATE_EXPECT_PACKFILE;
1165 				log_debug("uid %d: expecting packfile",
1166 				    client->euid);
1167 				err = recv_packfile(client);
1168 			} else {
1169 				/* should not happen, see above */
1170 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1171 				    "unexpected client state");
1172 				break;
1173 			}
1174 			break;
1175 		case GOTD_IMSG_DONE:
1176 			if (client->state != GOTD_STATE_EXPECT_HAVE &&
1177 			    client->state != GOTD_STATE_EXPECT_DONE) {
1178 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1179 				    "unexpected flush-pkt received");
1180 				break;
1181 			}
1182 			log_debug("received 'done' from uid %d", client->euid);
1183 			err = ensure_client_is_reading(client);
1184 			if (err)
1185 				break;
1186 			client->state = GOTD_STATE_DONE;
1187 			err = send_packfile(client);
1188 			break;
1189 		default:
1190 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1191 			break;
1192 		}
1193 
1194 		imsg_free(&imsg);
1195 	}
1196 
1197 	if (err) {
1198 		if (err->code != GOT_ERR_EOF ||
1199 		    client->state != GOTD_STATE_EXPECT_PACKFILE)
1200 			disconnect_on_error(client, err);
1201 	} else {
1202 		gotd_imsg_event_add(&client->iev);
1203 		if (client->state == GOTD_STATE_EXPECT_LIST_REFS)
1204 			evtimer_add(&client->tmo, &auth_timeout);
1205 		else
1206 			evtimer_add(&client->tmo, &timeout);
1207 	}
1208 }
1209 
1210 static void
1211 gotd_request_timeout(int fd, short events, void *arg)
1212 {
1213 	struct gotd_client *client = arg;
1214 
1215 	log_debug("disconnecting uid %d due to timeout", client->euid);
1216 	disconnect(client);
1217 }
1218 
1219 static const struct got_error *
1220 recv_connect(uint32_t *client_id, struct imsg *imsg)
1221 {
1222 	const struct got_error *err = NULL;
1223 	struct gotd_imsg_connect iconnect;
1224 	size_t datalen;
1225 	int s = -1;
1226 	struct gotd_client *client = NULL;
1227 	uid_t euid;
1228 	gid_t egid;
1229 
1230 	*client_id = 0;
1231 
1232 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1233 	if (datalen != sizeof(iconnect))
1234 		return got_error(GOT_ERR_PRIVSEP_LEN);
1235 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
1236 
1237 	s = imsg->fd;
1238 	if (s == -1) {
1239 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
1240 		goto done;
1241 	}
1242 
1243 	if (find_client(iconnect.client_id)) {
1244 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
1245 		goto done;
1246 	}
1247 
1248 	if (getpeereid(s, &euid, &egid) == -1) {
1249 		err = got_error_from_errno("getpeerid");
1250 		goto done;
1251 	}
1252 
1253 	client = calloc(1, sizeof(*client));
1254 	if (client == NULL) {
1255 		err = got_error_from_errno("calloc");
1256 		goto done;
1257 	}
1258 
1259 	*client_id = iconnect.client_id;
1260 
1261 	client->state = GOTD_STATE_EXPECT_LIST_REFS;
1262 	client->id = iconnect.client_id;
1263 	client->fd = s;
1264 	s = -1;
1265 	client->delta_cache_fd = -1;
1266 	client->euid = euid;
1267 	client->egid = egid;
1268 	client->nref_updates = -1;
1269 
1270 	imsg_init(&client->iev.ibuf, client->fd);
1271 	client->iev.handler = gotd_request;
1272 	client->iev.events = EV_READ;
1273 	client->iev.handler_arg = client;
1274 
1275 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
1276 	    &client->iev);
1277 	gotd_imsg_event_add(&client->iev);
1278 
1279 	evtimer_set(&client->tmo, gotd_request_timeout, client);
1280 
1281 	add_client(client);
1282 	log_debug("%s: new client uid %d connected on fd %d", __func__,
1283 	    client->euid, client->fd);
1284 done:
1285 	if (err) {
1286 		struct gotd_child_proc *listen_proc = &gotd.listen_proc;
1287 		struct gotd_imsg_disconnect idisconnect;
1288 
1289 		idisconnect.client_id = client->id;
1290 		if (gotd_imsg_compose_event(&listen_proc->iev,
1291 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
1292 		    &idisconnect, sizeof(idisconnect)) == -1)
1293 			log_warn("imsg compose DISCONNECT");
1294 
1295 		if (s != -1)
1296 			close(s);
1297 	}
1298 
1299 	return err;
1300 }
1301 
1302 static const char *gotd_proc_names[PROC_MAX] = {
1303 	"parent",
1304 	"listen",
1305 	"auth",
1306 	"repo_read",
1307 	"repo_write"
1308 };
1309 
1310 static void
1311 kill_proc(struct gotd_child_proc *proc, int fatal)
1312 {
1313 	if (fatal) {
1314 		log_warnx("sending SIGKILL to PID %d", proc->pid);
1315 		kill(proc->pid, SIGKILL);
1316 	} else
1317 		kill(proc->pid, SIGTERM);
1318 }
1319 
1320 static void
1321 gotd_shutdown(void)
1322 {
1323 	struct gotd_child_proc *proc;
1324 	uint64_t slot;
1325 
1326 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
1327 		struct gotd_client *c, *tmp;
1328 
1329 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
1330 			disconnect(c);
1331 	}
1332 
1333 	proc = &gotd.listen_proc;
1334 	msgbuf_clear(&proc->iev.ibuf.w);
1335 	close(proc->iev.ibuf.fd);
1336 	kill_proc(proc, 0);
1337 	wait_for_child(proc->pid);
1338 
1339 	log_info("terminating");
1340 	exit(0);
1341 }
1342 
1343 void
1344 gotd_sighdlr(int sig, short event, void *arg)
1345 {
1346 	/*
1347 	 * Normal signal handler rules don't apply because libevent
1348 	 * decouples for us.
1349 	 */
1350 
1351 	switch (sig) {
1352 	case SIGHUP:
1353 		log_info("%s: ignoring SIGHUP", __func__);
1354 		break;
1355 	case SIGUSR1:
1356 		log_info("%s: ignoring SIGUSR1", __func__);
1357 		break;
1358 	case SIGTERM:
1359 	case SIGINT:
1360 		gotd_shutdown();
1361 		log_warnx("gotd terminating");
1362 		exit(0);
1363 		break;
1364 	default:
1365 		fatalx("unexpected signal");
1366 	}
1367 }
1368 
1369 static const struct got_error *
1370 ensure_proc_is_reading(struct gotd_client *client,
1371     struct gotd_child_proc *proc)
1372 {
1373 	if (!client_is_reading(client)) {
1374 		kill_proc(proc, 1);
1375 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1376 		    "PID %d handled a read-request for uid %d but this "
1377 		    "user is not reading from a repository", proc->pid,
1378 		    client->euid);
1379 	}
1380 
1381 	return NULL;
1382 }
1383 
1384 static const struct got_error *
1385 ensure_proc_is_writing(struct gotd_client *client,
1386     struct gotd_child_proc *proc)
1387 {
1388 	if (!client_is_writing(client)) {
1389 		kill_proc(proc, 1);
1390 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1391 		    "PID %d handled a write-request for uid %d but this "
1392 		    "user is not writing to a repository", proc->pid,
1393 		    client->euid);
1394 	}
1395 
1396 	return NULL;
1397 }
1398 
1399 static int
1400 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
1401     struct imsg *imsg)
1402 {
1403 	const struct got_error *err;
1404 	struct gotd_child_proc *client_proc;
1405 	int ret = 0;
1406 
1407 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
1408 		client_proc = get_client_proc(client);
1409 		if (client_proc == NULL)
1410 			fatalx("no process found for uid %d", client->euid);
1411 		if (proc->pid != client_proc->pid) {
1412 			kill_proc(proc, 1);
1413 			log_warnx("received message from PID %d for uid %d, "
1414 			    "while PID %d is the process serving this user",
1415 			    proc->pid, client->euid, client_proc->pid);
1416 			return 0;
1417 		}
1418 	}
1419 
1420 	switch (imsg->hdr.type) {
1421 	case GOTD_IMSG_ERROR:
1422 		ret = 1;
1423 		break;
1424 	case GOTD_IMSG_CONNECT:
1425 		if (proc->type != PROC_LISTEN) {
1426 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1427 			    "new connection for uid %d from PID %d "
1428 			    "which is not the listen process",
1429 			    proc->pid, client->euid);
1430 		} else
1431 			ret = 1;
1432 		break;
1433 	case GOTD_IMSG_ACCESS_GRANTED:
1434 		if (proc->type != PROC_AUTH) {
1435 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1436 			    "authentication of uid %d from PID %d "
1437 			    "which is not the auth process",
1438 			    proc->pid, client->euid);
1439 		} else
1440 			ret = 1;
1441 		break;
1442 	case GOTD_IMSG_REPO_CHILD_READY:
1443 		if (proc->type != PROC_REPO_READ &&
1444 		    proc->type != PROC_REPO_WRITE) {
1445 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
1446 			    "unexpected \"ready\" signal from PID %d",
1447 			    proc->pid);
1448 		} else
1449 			ret = 1;
1450 		break;
1451 	case GOTD_IMSG_PACKFILE_DONE:
1452 		err = ensure_proc_is_reading(client, proc);
1453 		if (err)
1454 			log_warnx("uid %d: %s", client->euid, err->msg);
1455 		else
1456 			ret = 1;
1457 		break;
1458 	case GOTD_IMSG_PACKFILE_INSTALL:
1459 	case GOTD_IMSG_REF_UPDATES_START:
1460 	case GOTD_IMSG_REF_UPDATE:
1461 		err = ensure_proc_is_writing(client, proc);
1462 		if (err)
1463 			log_warnx("uid %d: %s", client->euid, err->msg);
1464 		else
1465 			ret = 1;
1466 		break;
1467 	default:
1468 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
1469 		break;
1470 	}
1471 
1472 	return ret;
1473 }
1474 
1475 static const struct got_error *
1476 list_refs_request(struct gotd_client *client, struct gotd_imsgev *iev)
1477 {
1478 	static const struct got_error *err;
1479 	struct gotd_imsg_list_refs_internal ilref;
1480 	int fd;
1481 
1482 	memset(&ilref, 0, sizeof(ilref));
1483 	ilref.client_id = client->id;
1484 
1485 	fd = dup(client->fd);
1486 	if (fd == -1)
1487 		return got_error_from_errno("dup");
1488 
1489 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_LIST_REFS_INTERNAL,
1490 	    PROC_GOTD, fd, &ilref, sizeof(ilref)) == -1) {
1491 		err = got_error_from_errno("imsg compose WANT");
1492 		close(fd);
1493 		return err;
1494 	}
1495 
1496 	client->state = GOTD_STATE_EXPECT_CAPABILITIES;
1497 	log_debug("uid %d: expecting capabilities", client->euid);
1498 	return NULL;
1499 }
1500 
1501 static const struct got_error *
1502 recv_packfile_done(uint32_t *client_id, struct imsg *imsg)
1503 {
1504 	struct gotd_imsg_packfile_done idone;
1505 	size_t datalen;
1506 
1507 	log_debug("packfile-done received");
1508 
1509 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1510 	if (datalen != sizeof(idone))
1511 		return got_error(GOT_ERR_PRIVSEP_LEN);
1512 	memcpy(&idone, imsg->data, sizeof(idone));
1513 
1514 	*client_id = idone.client_id;
1515 	return NULL;
1516 }
1517 
1518 static const struct got_error *
1519 recv_packfile_install(uint32_t *client_id, struct imsg *imsg)
1520 {
1521 	struct gotd_imsg_packfile_install inst;
1522 	size_t datalen;
1523 
1524 	log_debug("packfile-install received");
1525 
1526 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1527 	if (datalen != sizeof(inst))
1528 		return got_error(GOT_ERR_PRIVSEP_LEN);
1529 	memcpy(&inst, imsg->data, sizeof(inst));
1530 
1531 	*client_id = inst.client_id;
1532 	return NULL;
1533 }
1534 
1535 static const struct got_error *
1536 recv_ref_updates_start(uint32_t *client_id, struct imsg *imsg)
1537 {
1538 	struct gotd_imsg_ref_updates_start istart;
1539 	size_t datalen;
1540 
1541 	log_debug("ref-updates-start received");
1542 
1543 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1544 	if (datalen != sizeof(istart))
1545 		return got_error(GOT_ERR_PRIVSEP_LEN);
1546 	memcpy(&istart, imsg->data, sizeof(istart));
1547 
1548 	*client_id = istart.client_id;
1549 	return NULL;
1550 }
1551 
1552 static const struct got_error *
1553 recv_ref_update(uint32_t *client_id, struct imsg *imsg)
1554 {
1555 	struct gotd_imsg_ref_update iref;
1556 	size_t datalen;
1557 
1558 	log_debug("ref-update received");
1559 
1560 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1561 	if (datalen < sizeof(iref))
1562 		return got_error(GOT_ERR_PRIVSEP_LEN);
1563 	memcpy(&iref, imsg->data, sizeof(iref));
1564 
1565 	*client_id = iref.client_id;
1566 	return NULL;
1567 }
1568 
1569 static const struct got_error *
1570 send_ref_update_ok(struct gotd_client *client,
1571     struct gotd_imsg_ref_update *iref, const char *refname)
1572 {
1573 	struct gotd_imsg_ref_update_ok iok;
1574 	struct ibuf *wbuf;
1575 	size_t len;
1576 
1577 	memset(&iok, 0, sizeof(iok));
1578 	iok.client_id = client->id;
1579 	memcpy(iok.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1580 	memcpy(iok.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1581 	iok.name_len = strlen(refname);
1582 
1583 	len = sizeof(iok) + iok.name_len;
1584 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_OK,
1585 	    PROC_GOTD, gotd.pid, len);
1586 	if (wbuf == NULL)
1587 		return got_error_from_errno("imsg_create REF_UPDATE_OK");
1588 
1589 	if (imsg_add(wbuf, &iok, sizeof(iok)) == -1)
1590 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1591 	if (imsg_add(wbuf, refname, iok.name_len) == -1)
1592 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1593 
1594 	wbuf->fd = -1;
1595 	imsg_close(&client->iev.ibuf, wbuf);
1596 	gotd_imsg_event_add(&client->iev);
1597 	return NULL;
1598 }
1599 
1600 static void
1601 send_refs_updated(struct gotd_client *client)
1602 {
1603 	if (gotd_imsg_compose_event(&client->iev,
1604 	    GOTD_IMSG_REFS_UPDATED, PROC_GOTD, -1, NULL, 0) == -1)
1605 		log_warn("imsg compose REFS_UPDATED");
1606 }
1607 
1608 static const struct got_error *
1609 send_ref_update_ng(struct gotd_client *client,
1610     struct gotd_imsg_ref_update *iref, const char *refname,
1611     const char *reason)
1612 {
1613 	const struct got_error *ng_err;
1614 	struct gotd_imsg_ref_update_ng ing;
1615 	struct ibuf *wbuf;
1616 	size_t len;
1617 
1618 	memset(&ing, 0, sizeof(ing));
1619 	ing.client_id = client->id;
1620 	memcpy(ing.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1621 	memcpy(ing.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1622 	ing.name_len = strlen(refname);
1623 
1624 	ng_err = got_error_fmt(GOT_ERR_REF_BUSY, "%s", reason);
1625 	ing.reason_len = strlen(ng_err->msg);
1626 
1627 	len = sizeof(ing) + ing.name_len + ing.reason_len;
1628 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_NG,
1629 	    PROC_GOTD, gotd.pid, len);
1630 	if (wbuf == NULL)
1631 		return got_error_from_errno("imsg_create REF_UPDATE_NG");
1632 
1633 	if (imsg_add(wbuf, &ing, sizeof(ing)) == -1)
1634 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1635 	if (imsg_add(wbuf, refname, ing.name_len) == -1)
1636 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1637 	if (imsg_add(wbuf, ng_err->msg, ing.reason_len) == -1)
1638 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1639 
1640 	wbuf->fd = -1;
1641 	imsg_close(&client->iev.ibuf, wbuf);
1642 	gotd_imsg_event_add(&client->iev);
1643 	return NULL;
1644 }
1645 
1646 static const struct got_error *
1647 install_pack(struct gotd_client *client, const char *repo_path,
1648     struct imsg *imsg)
1649 {
1650 	const struct got_error *err = NULL;
1651 	struct gotd_imsg_packfile_install inst;
1652 	char hex[SHA1_DIGEST_STRING_LENGTH];
1653 	size_t datalen;
1654 	char *packfile_path = NULL, *packidx_path = NULL;
1655 
1656 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1657 	if (datalen != sizeof(inst))
1658 		return got_error(GOT_ERR_PRIVSEP_LEN);
1659 	memcpy(&inst, imsg->data, sizeof(inst));
1660 
1661 	if (client->packfile_path == NULL)
1662 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1663 		    "client has no pack file");
1664 	if (client->packidx_path == NULL)
1665 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1666 		    "client has no pack file index");
1667 
1668 	if (got_sha1_digest_to_str(inst.pack_sha1, hex, sizeof(hex)) == NULL)
1669 		return got_error_msg(GOT_ERR_NO_SPACE,
1670 		    "could not convert pack file SHA1 to hex");
1671 
1672 	if (asprintf(&packfile_path, "/%s/%s/pack-%s.pack",
1673 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1674 		err = got_error_from_errno("asprintf");
1675 		goto done;
1676 	}
1677 
1678 	if (asprintf(&packidx_path, "/%s/%s/pack-%s.idx",
1679 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1680 		err = got_error_from_errno("asprintf");
1681 		goto done;
1682 	}
1683 
1684 	if (rename(client->packfile_path, packfile_path) == -1) {
1685 		err = got_error_from_errno3("rename", client->packfile_path,
1686 		    packfile_path);
1687 		goto done;
1688 	}
1689 
1690 	free(client->packfile_path);
1691 	client->packfile_path = NULL;
1692 
1693 	if (rename(client->packidx_path, packidx_path) == -1) {
1694 		err = got_error_from_errno3("rename", client->packidx_path,
1695 		    packidx_path);
1696 		goto done;
1697 	}
1698 
1699 	free(client->packidx_path);
1700 	client->packidx_path = NULL;
1701 done:
1702 	free(packfile_path);
1703 	free(packidx_path);
1704 	return err;
1705 }
1706 
1707 static const struct got_error *
1708 begin_ref_updates(struct gotd_client *client, struct imsg *imsg)
1709 {
1710 	struct gotd_imsg_ref_updates_start istart;
1711 	size_t datalen;
1712 
1713 	if (client->nref_updates != -1)
1714 		return got_error(GOT_ERR_PRIVSEP_MSG);
1715 
1716 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1717 	if (datalen != sizeof(istart))
1718 		return got_error(GOT_ERR_PRIVSEP_LEN);
1719 	memcpy(&istart, imsg->data, sizeof(istart));
1720 
1721 	if (istart.nref_updates <= 0)
1722 		return got_error(GOT_ERR_PRIVSEP_MSG);
1723 
1724 	client->nref_updates = istart.nref_updates;
1725 	return NULL;
1726 }
1727 
1728 static const struct got_error *
1729 update_ref(struct gotd_client *client, const char *repo_path,
1730     struct imsg *imsg)
1731 {
1732 	const struct got_error *err = NULL;
1733 	struct got_repository *repo = NULL;
1734 	struct got_reference *ref = NULL;
1735 	struct gotd_imsg_ref_update iref;
1736 	struct got_object_id old_id, new_id;
1737 	struct got_object_id *id = NULL;
1738 	struct got_object *obj = NULL;
1739 	char *refname = NULL;
1740 	size_t datalen;
1741 	int locked = 0;
1742 
1743 	log_debug("update-ref from uid %d", client->euid);
1744 
1745 	if (client->nref_updates <= 0)
1746 		return got_error(GOT_ERR_PRIVSEP_MSG);
1747 
1748 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1749 	if (datalen < sizeof(iref))
1750 		return got_error(GOT_ERR_PRIVSEP_LEN);
1751 	memcpy(&iref, imsg->data, sizeof(iref));
1752 	if (datalen != sizeof(iref) + iref.name_len)
1753 		return got_error(GOT_ERR_PRIVSEP_LEN);
1754 	refname = malloc(iref.name_len + 1);
1755 	if (refname == NULL)
1756 		return got_error_from_errno("malloc");
1757 	memcpy(refname, imsg->data + sizeof(iref), iref.name_len);
1758 	refname[iref.name_len] = '\0';
1759 
1760 	log_debug("updating ref %s for uid %d", refname, client->euid);
1761 
1762 	err = got_repo_open(&repo, repo_path, NULL, NULL);
1763 	if (err)
1764 		goto done;
1765 
1766 	memcpy(old_id.sha1, iref.old_id, SHA1_DIGEST_LENGTH);
1767 	memcpy(new_id.sha1, iref.new_id, SHA1_DIGEST_LENGTH);
1768 	err = got_object_open(&obj, repo, &new_id);
1769 	if (err)
1770 		goto done;
1771 
1772 	if (iref.ref_is_new) {
1773 		err = got_ref_open(&ref, repo, refname, 0);
1774 		if (err) {
1775 			if (err->code != GOT_ERR_NOT_REF)
1776 				goto done;
1777 			err = got_ref_alloc(&ref, refname, &new_id);
1778 			if (err)
1779 				goto done;
1780 			err = got_ref_write(ref, repo); /* will lock/unlock */
1781 			if (err)
1782 				goto done;
1783 		} else {
1784 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1785 			    "%s has been created by someone else "
1786 			    "while transaction was in progress",
1787 			    got_ref_get_name(ref));
1788 			goto done;
1789 		}
1790 	} else {
1791 		err = got_ref_open(&ref, repo, refname, 1 /* lock */);
1792 		if (err)
1793 			goto done;
1794 		locked = 1;
1795 
1796 		err = got_ref_resolve(&id, repo, ref);
1797 		if (err)
1798 			goto done;
1799 
1800 		if (got_object_id_cmp(id, &old_id) != 0) {
1801 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1802 			    "%s has been modified by someone else "
1803 			    "while transaction was in progress",
1804 			    got_ref_get_name(ref));
1805 			goto done;
1806 		}
1807 
1808 		err = got_ref_change_ref(ref, &new_id);
1809 		if (err)
1810 			goto done;
1811 
1812 		err = got_ref_write(ref, repo);
1813 		if (err)
1814 			goto done;
1815 
1816 		free(id);
1817 		id = NULL;
1818 	}
1819 done:
1820 	if (err) {
1821 		if (err->code == GOT_ERR_LOCKFILE_TIMEOUT) {
1822 			err = got_error_fmt(GOT_ERR_LOCKFILE_TIMEOUT,
1823 			    "could not acquire exclusive file lock for %s",
1824 			    refname);
1825 		}
1826 		send_ref_update_ng(client, &iref, refname, err->msg);
1827 	} else
1828 		send_ref_update_ok(client, &iref, refname);
1829 
1830 	if (client->nref_updates > 0) {
1831 		client->nref_updates--;
1832 		if (client->nref_updates == 0)
1833 			send_refs_updated(client);
1834 
1835 	}
1836 	if (locked) {
1837 		const struct got_error *unlock_err;
1838 		unlock_err = got_ref_unlock(ref);
1839 		if (unlock_err && err == NULL)
1840 			err = unlock_err;
1841 	}
1842 	if (ref)
1843 		got_ref_close(ref);
1844 	if (obj)
1845 		got_object_close(obj);
1846 	if (repo)
1847 		got_repo_close(repo);
1848 	free(refname);
1849 	free(id);
1850 	return err;
1851 }
1852 
1853 static void
1854 gotd_dispatch_listener(int fd, short event, void *arg)
1855 {
1856 	struct gotd_imsgev *iev = arg;
1857 	struct imsgbuf *ibuf = &iev->ibuf;
1858 	struct gotd_child_proc *proc = &gotd.listen_proc;
1859 	ssize_t n;
1860 	int shut = 0;
1861 	struct imsg imsg;
1862 
1863 	if (proc->iev.ibuf.fd != fd)
1864 		fatalx("%s: unexpected fd %d", __func__, fd);
1865 
1866 	if (event & EV_READ) {
1867 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1868 			fatal("imsg_read error");
1869 		if (n == 0) {
1870 			/* Connection closed. */
1871 			shut = 1;
1872 			goto done;
1873 		}
1874 	}
1875 
1876 	if (event & EV_WRITE) {
1877 		n = msgbuf_write(&ibuf->w);
1878 		if (n == -1 && errno != EAGAIN)
1879 			fatal("msgbuf_write");
1880 		if (n == 0) {
1881 			/* Connection closed. */
1882 			shut = 1;
1883 			goto done;
1884 		}
1885 	}
1886 
1887 	for (;;) {
1888 		const struct got_error *err = NULL;
1889 		struct gotd_client *client = NULL;
1890 		uint32_t client_id = 0;
1891 		int do_disconnect = 0;
1892 
1893 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1894 			fatal("%s: imsg_get error", __func__);
1895 		if (n == 0)	/* No more messages. */
1896 			break;
1897 
1898 		switch (imsg.hdr.type) {
1899 		case GOTD_IMSG_ERROR:
1900 			do_disconnect = 1;
1901 			err = gotd_imsg_recv_error(&client_id, &imsg);
1902 			break;
1903 		case GOTD_IMSG_CONNECT:
1904 			err = recv_connect(&client_id, &imsg);
1905 			break;
1906 		default:
1907 			log_debug("unexpected imsg %d", imsg.hdr.type);
1908 			break;
1909 		}
1910 
1911 		client = find_client(client_id);
1912 		if (client == NULL) {
1913 			log_warnx("%s: client not found", __func__);
1914 			imsg_free(&imsg);
1915 			continue;
1916 		}
1917 
1918 		if (err)
1919 			log_warnx("uid %d: %s", client->euid, err->msg);
1920 
1921 		if (do_disconnect) {
1922 			if (err)
1923 				disconnect_on_error(client, err);
1924 			else
1925 				disconnect(client);
1926 		}
1927 
1928 		imsg_free(&imsg);
1929 	}
1930 done:
1931 	if (!shut) {
1932 		gotd_imsg_event_add(iev);
1933 	} else {
1934 		/* This pipe is dead. Remove its event handler */
1935 		event_del(&iev->ev);
1936 		event_loopexit(NULL);
1937 	}
1938 }
1939 
1940 static void
1941 gotd_dispatch_auth_child(int fd, short event, void *arg)
1942 {
1943 	const struct got_error *err = NULL;
1944 	struct gotd_imsgev *iev = arg;
1945 	struct imsgbuf *ibuf = &iev->ibuf;
1946 	struct gotd_client *client;
1947 	struct gotd_repo *repo = NULL;
1948 	ssize_t n;
1949 	int shut = 0;
1950 	struct imsg imsg;
1951 	uint32_t client_id = 0;
1952 	int do_disconnect = 0;
1953 	enum gotd_procid proc_type;
1954 
1955 	client = find_client_by_proc_fd(fd);
1956 	if (client == NULL)
1957 		fatalx("cannot find client for fd %d", fd);
1958 
1959 	if (client->auth == NULL)
1960 		fatalx("cannot find auth child process for fd %d", fd);
1961 
1962 	if (event & EV_READ) {
1963 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1964 			fatal("imsg_read error");
1965 		if (n == 0) {
1966 			/* Connection closed. */
1967 			shut = 1;
1968 			goto done;
1969 		}
1970 	}
1971 
1972 	if (event & EV_WRITE) {
1973 		n = msgbuf_write(&ibuf->w);
1974 		if (n == -1 && errno != EAGAIN)
1975 			fatal("msgbuf_write");
1976 		if (n == 0) {
1977 			/* Connection closed. */
1978 			shut = 1;
1979 		}
1980 		goto done;
1981 	}
1982 
1983 	if (client->auth->iev.ibuf.fd != fd)
1984 		fatalx("%s: unexpected fd %d", __func__, fd);
1985 
1986 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1987 		fatal("%s: imsg_get error", __func__);
1988 	if (n == 0)	/* No more messages. */
1989 		return;
1990 
1991 	evtimer_del(&client->tmo);
1992 
1993 	switch (imsg.hdr.type) {
1994 	case GOTD_IMSG_ERROR:
1995 		do_disconnect = 1;
1996 		err = gotd_imsg_recv_error(&client_id, &imsg);
1997 		break;
1998 	case GOTD_IMSG_ACCESS_GRANTED:
1999 		break;
2000 	default:
2001 		do_disconnect = 1;
2002 		log_debug("unexpected imsg %d", imsg.hdr.type);
2003 		break;
2004 	}
2005 
2006 	if (!verify_imsg_src(client, client->auth, &imsg)) {
2007 		do_disconnect = 1;
2008 		log_debug("dropping imsg type %d from PID %d",
2009 		    imsg.hdr.type, client->auth->pid);
2010 	}
2011 	imsg_free(&imsg);
2012 
2013 	if (do_disconnect) {
2014 		if (err)
2015 			disconnect_on_error(client, err);
2016 		else
2017 			disconnect(client);
2018 		goto done;
2019 	}
2020 
2021 	repo = find_repo_by_name(client->auth->repo_name);
2022 	if (repo == NULL) {
2023 		err = got_error(GOT_ERR_NOT_GIT_REPO);
2024 		goto done;
2025 	}
2026 	kill_auth_proc(client);
2027 
2028 	log_info("authenticated uid %d for repository %s\n",
2029 	    client->euid, repo->name);
2030 
2031 	if (client->required_auth & GOTD_AUTH_WRITE)
2032 		proc_type = PROC_REPO_WRITE;
2033 	else
2034 		proc_type = PROC_REPO_READ;
2035 
2036 	err = start_repo_child(client, proc_type, repo,
2037 		gotd.argv0, gotd.confpath, gotd.daemonize,
2038 		gotd.verbosity);
2039 done:
2040 	if (err)
2041 		log_warnx("uid %d: %s", client->euid, err->msg);
2042 
2043 	/* We might have killed the auth process by now. */
2044 	if (client->auth != NULL) {
2045 		if (!shut) {
2046 			gotd_imsg_event_add(iev);
2047 		} else {
2048 			/* This pipe is dead. Remove its event handler */
2049 			event_del(&iev->ev);
2050 		}
2051 	}
2052 }
2053 
2054 static void
2055 gotd_dispatch_repo_child(int fd, short event, void *arg)
2056 {
2057 	struct gotd_imsgev *iev = arg;
2058 	struct imsgbuf *ibuf = &iev->ibuf;
2059 	struct gotd_child_proc *proc = NULL;
2060 	struct gotd_client *client = NULL;
2061 	ssize_t n;
2062 	int shut = 0;
2063 	struct imsg imsg;
2064 
2065 	if (event & EV_READ) {
2066 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
2067 			fatal("imsg_read error");
2068 		if (n == 0) {
2069 			/* Connection closed. */
2070 			shut = 1;
2071 			goto done;
2072 		}
2073 	}
2074 
2075 	if (event & EV_WRITE) {
2076 		n = msgbuf_write(&ibuf->w);
2077 		if (n == -1 && errno != EAGAIN)
2078 			fatal("msgbuf_write");
2079 		if (n == 0) {
2080 			/* Connection closed. */
2081 			shut = 1;
2082 			goto done;
2083 		}
2084 	}
2085 
2086 	client = find_client_by_proc_fd(fd);
2087 	if (client == NULL)
2088 		fatalx("cannot find client for fd %d", fd);
2089 
2090 	proc = get_client_proc(client);
2091 	if (proc == NULL)
2092 		fatalx("cannot find child process for fd %d", fd);
2093 
2094 	for (;;) {
2095 		const struct got_error *err = NULL;
2096 		uint32_t client_id = 0;
2097 		int do_disconnect = 0;
2098 		int do_list_refs = 0, do_ref_updates = 0, do_ref_update = 0;
2099 		int do_packfile_install = 0;
2100 
2101 		if ((n = imsg_get(ibuf, &imsg)) == -1)
2102 			fatal("%s: imsg_get error", __func__);
2103 		if (n == 0)	/* No more messages. */
2104 			break;
2105 
2106 		switch (imsg.hdr.type) {
2107 		case GOTD_IMSG_ERROR:
2108 			do_disconnect = 1;
2109 			err = gotd_imsg_recv_error(&client_id, &imsg);
2110 			break;
2111 		case GOTD_IMSG_REPO_CHILD_READY:
2112 			do_list_refs = 1;
2113 			break;
2114 		case GOTD_IMSG_PACKFILE_DONE:
2115 			do_disconnect = 1;
2116 			err = recv_packfile_done(&client_id, &imsg);
2117 			break;
2118 		case GOTD_IMSG_PACKFILE_INSTALL:
2119 			err = recv_packfile_install(&client_id, &imsg);
2120 			if (err == NULL)
2121 				do_packfile_install = 1;
2122 			break;
2123 		case GOTD_IMSG_REF_UPDATES_START:
2124 			err = recv_ref_updates_start(&client_id, &imsg);
2125 			if (err == NULL)
2126 				do_ref_updates = 1;
2127 			break;
2128 		case GOTD_IMSG_REF_UPDATE:
2129 			err = recv_ref_update(&client_id, &imsg);
2130 			if (err == NULL)
2131 				do_ref_update = 1;
2132 			break;
2133 		default:
2134 			log_debug("unexpected imsg %d", imsg.hdr.type);
2135 			break;
2136 		}
2137 
2138 		if (!verify_imsg_src(client, proc, &imsg)) {
2139 			log_debug("dropping imsg type %d from PID %d",
2140 			    imsg.hdr.type, proc->pid);
2141 			imsg_free(&imsg);
2142 			continue;
2143 		}
2144 		if (err)
2145 			log_warnx("uid %d: %s", client->euid, err->msg);
2146 
2147 		if (do_disconnect) {
2148 			if (err)
2149 				disconnect_on_error(client, err);
2150 			else
2151 				disconnect(client);
2152 		} else {
2153 			if (do_list_refs)
2154 				err = list_refs_request(client, iev);
2155 			else if (do_packfile_install)
2156 				err = install_pack(client, proc->repo_path,
2157 				    &imsg);
2158 			else if (do_ref_updates)
2159 				err = begin_ref_updates(client, &imsg);
2160 			else if (do_ref_update)
2161 				err = update_ref(client, proc->repo_path,
2162 				    &imsg);
2163 			if (err)
2164 				log_warnx("uid %d: %s", client->euid, err->msg);
2165 		}
2166 		imsg_free(&imsg);
2167 	}
2168 done:
2169 	if (!shut) {
2170 		gotd_imsg_event_add(iev);
2171 	} else {
2172 		/* This pipe is dead. Remove its event handler */
2173 		event_del(&iev->ev);
2174 		event_loopexit(NULL);
2175 	}
2176 }
2177 
2178 static pid_t
2179 start_child(enum gotd_procid proc_id, const char *repo_path,
2180     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
2181 {
2182 	char	*argv[11];
2183 	int	 argc = 0;
2184 	pid_t	 pid;
2185 
2186 	switch (pid = fork()) {
2187 	case -1:
2188 		fatal("cannot fork");
2189 	case 0:
2190 		break;
2191 	default:
2192 		close(fd);
2193 		return pid;
2194 	}
2195 
2196 	if (fd != GOTD_FILENO_MSG_PIPE) {
2197 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
2198 			fatal("cannot setup imsg fd");
2199 	} else if (fcntl(fd, F_SETFD, 0) == -1)
2200 		fatal("cannot setup imsg fd");
2201 
2202 	argv[argc++] = argv0;
2203 	switch (proc_id) {
2204 	case PROC_LISTEN:
2205 		argv[argc++] = (char *)"-L";
2206 		break;
2207 	case PROC_AUTH:
2208 		argv[argc++] = (char *)"-A";
2209 		break;
2210 	case PROC_REPO_READ:
2211 		argv[argc++] = (char *)"-R";
2212 		break;
2213 	case PROC_REPO_WRITE:
2214 		argv[argc++] = (char *)"-W";
2215 		break;
2216 	default:
2217 		fatalx("invalid process id %d", proc_id);
2218 	}
2219 
2220 	argv[argc++] = (char *)"-f";
2221 	argv[argc++] = (char *)confpath;
2222 
2223 	if (repo_path) {
2224 		argv[argc++] = (char *)"-P";
2225 		argv[argc++] = (char *)repo_path;
2226 	}
2227 
2228 	if (!daemonize)
2229 		argv[argc++] = (char *)"-d";
2230 	if (verbosity > 0)
2231 		argv[argc++] = (char *)"-v";
2232 	if (verbosity > 1)
2233 		argv[argc++] = (char *)"-v";
2234 	argv[argc++] = NULL;
2235 
2236 	execvp(argv0, argv);
2237 	fatal("execvp");
2238 }
2239 
2240 static void
2241 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
2242 {
2243 	struct gotd_child_proc *proc = &gotd.listen_proc;
2244 
2245 	proc->type = PROC_LISTEN;
2246 
2247 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2248 	    PF_UNSPEC, proc->pipe) == -1)
2249 		fatal("socketpair");
2250 
2251 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
2252 	    proc->pipe[1], daemonize, verbosity);
2253 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2254 	proc->iev.handler = gotd_dispatch_listener;
2255 	proc->iev.events = EV_READ;
2256 	proc->iev.handler_arg = NULL;
2257 }
2258 
2259 static const struct got_error *
2260 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
2261     struct gotd_repo *repo, char *argv0, const char *confpath,
2262     int daemonize, int verbosity)
2263 {
2264 	struct gotd_child_proc *proc;
2265 
2266 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
2267 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
2268 		
2269 	proc = calloc(1, sizeof(*proc));
2270 	if (proc == NULL)
2271 		return got_error_from_errno("calloc");
2272 
2273 	proc->type = proc_type;
2274 	if (strlcpy(proc->repo_name, repo->name,
2275 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2276 		fatalx("repository name too long: %s", repo->name);
2277 	log_debug("starting %s for repository %s",
2278 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
2279 	if (realpath(repo->path, proc->repo_path) == NULL)
2280 		fatal("%s", repo->path);
2281 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2282 	    PF_UNSPEC, proc->pipe) == -1)
2283 		fatal("socketpair");
2284 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2285 	    confpath, proc->pipe[1], daemonize, verbosity);
2286 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2287 	log_debug("proc %s %s is on fd %d",
2288 	    gotd_proc_names[proc->type], proc->repo_path,
2289 	    proc->pipe[0]);
2290 	proc->iev.handler = gotd_dispatch_repo_child;
2291 	proc->iev.events = EV_READ;
2292 	proc->iev.handler_arg = NULL;
2293 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2294 	    gotd_dispatch_repo_child, &proc->iev);
2295 	gotd_imsg_event_add(&proc->iev);
2296 
2297 	if (proc->type == PROC_REPO_READ)
2298 		client->repo_read = proc;
2299 	else
2300 		client->repo_write = proc;
2301 
2302 	return NULL;
2303 }
2304 
2305 static const struct got_error *
2306 start_auth_child(struct gotd_client *client, int required_auth,
2307     struct gotd_repo *repo, char *argv0, const char *confpath,
2308     int daemonize, int verbosity)
2309 {
2310 	struct gotd_child_proc *proc;
2311 	struct gotd_imsg_auth iauth;
2312 
2313 	memset(&iauth, 0, sizeof(iauth));
2314 
2315 	proc = calloc(1, sizeof(*proc));
2316 	if (proc == NULL)
2317 		return got_error_from_errno("calloc");
2318 
2319 	proc->type = PROC_AUTH;
2320 	if (strlcpy(proc->repo_name, repo->name,
2321 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2322 		fatalx("repository name too long: %s", repo->name);
2323 	log_debug("starting auth for uid %d repository %s",
2324 	    client->euid, repo->name);
2325 	if (realpath(repo->path, proc->repo_path) == NULL)
2326 		fatal("%s", repo->path);
2327 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2328 	    PF_UNSPEC, proc->pipe) == -1)
2329 		fatal("socketpair");
2330 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
2331 	    confpath, proc->pipe[1], daemonize, verbosity);
2332 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2333 	log_debug("proc %s %s is on fd %d",
2334 	    gotd_proc_names[proc->type], proc->repo_path,
2335 	    proc->pipe[0]);
2336 	proc->iev.handler = gotd_dispatch_auth_child;
2337 	proc->iev.events = EV_READ;
2338 	proc->iev.handler_arg = NULL;
2339 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2340 	    gotd_dispatch_auth_child, &proc->iev);
2341 	gotd_imsg_event_add(&proc->iev);
2342 
2343 	iauth.euid = client->euid;
2344 	iauth.egid = client->egid;
2345 	iauth.required_auth = required_auth;
2346 	iauth.client_id = client->id;
2347 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
2348 	    PROC_GOTD, -1, &iauth, sizeof(iauth)) == -1)
2349 		log_warn("imsg compose AUTHENTICATE");
2350 
2351 	client->auth = proc;
2352 	client->required_auth = required_auth;
2353 	return NULL;
2354 }
2355 
2356 static void
2357 apply_unveil_repo_readonly(const char *repo_path)
2358 {
2359 	if (unveil(repo_path, "r") == -1)
2360 		fatal("unveil %s", repo_path);
2361 
2362 	if (unveil(NULL, NULL) == -1)
2363 		fatal("unveil");
2364 }
2365 
2366 static void
2367 apply_unveil(void)
2368 {
2369 	struct gotd_repo *repo;
2370 
2371 	if (unveil(gotd.argv0, "x") == -1)
2372 		fatal("unveil %s", gotd.argv0);
2373 
2374 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
2375 		if (unveil(repo->path, "rwc") == -1)
2376 			fatal("unveil %s", repo->path);
2377 	}
2378 
2379 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
2380 		fatal("unveil %s", GOT_TMPDIR_STR);
2381 
2382 	if (unveil(NULL, NULL) == -1)
2383 		fatal("unveil");
2384 }
2385 
2386 int
2387 main(int argc, char **argv)
2388 {
2389 	const struct got_error *error = NULL;
2390 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
2391 	const char *confpath = GOTD_CONF_PATH;
2392 	char *argv0 = argv[0];
2393 	char title[2048];
2394 	gid_t groups[NGROUPS_MAX];
2395 	int ngroups = NGROUPS_MAX;
2396 	struct passwd *pw = NULL;
2397 	struct group *gr = NULL;
2398 	char *repo_path = NULL;
2399 	enum gotd_procid proc_id = PROC_GOTD;
2400 	struct event evsigint, evsigterm, evsighup, evsigusr1;
2401 	int *pack_fds = NULL, *temp_fds = NULL;
2402 
2403 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
2404 
2405 	while ((ch = getopt(argc, argv, "Adf:LnP:RvW")) != -1) {
2406 		switch (ch) {
2407 		case 'A':
2408 			proc_id = PROC_AUTH;
2409 			break;
2410 		case 'd':
2411 			daemonize = 0;
2412 			break;
2413 		case 'f':
2414 			confpath = optarg;
2415 			break;
2416 		case 'L':
2417 			proc_id = PROC_LISTEN;
2418 			break;
2419 		case 'n':
2420 			noaction = 1;
2421 			break;
2422 		case 'P':
2423 			repo_path = realpath(optarg, NULL);
2424 			if (repo_path == NULL)
2425 				fatal("realpath '%s'", optarg);
2426 			break;
2427 		case 'R':
2428 			proc_id = PROC_REPO_READ;
2429 			break;
2430 		case 'v':
2431 			if (verbosity < 3)
2432 				verbosity++;
2433 			break;
2434 		case 'W':
2435 			proc_id = PROC_REPO_WRITE;
2436 			break;
2437 		default:
2438 			usage();
2439 		}
2440 	}
2441 
2442 	argc -= optind;
2443 	argv += optind;
2444 
2445 	if (argc != 0)
2446 		usage();
2447 
2448 	/* Require an absolute path in argv[0] for reliable re-exec. */
2449 	if (!got_path_is_absolute(argv0))
2450 		fatalx("bad path \"%s\": must be an absolute path", argv0);
2451 
2452 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
2453 		fatalx("need root privileges");
2454 
2455 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
2456 	log_setverbose(verbosity);
2457 
2458 	if (parse_config(confpath, proc_id, &gotd) != 0)
2459 		return 1;
2460 
2461 	gotd.argv0 = argv0;
2462 	gotd.daemonize = daemonize;
2463 	gotd.verbosity = verbosity;
2464 	gotd.confpath = confpath;
2465 
2466 	if (proc_id == PROC_GOTD &&
2467 	    (gotd.nrepos == 0 || TAILQ_EMPTY(&gotd.repos)))
2468 		fatalx("no repository defined in configuration file");
2469 
2470 	pw = getpwnam(gotd.user_name);
2471 	if (pw == NULL)
2472 		fatalx("user %s not found", gotd.user_name);
2473 
2474 	if (pw->pw_uid == 0) {
2475 		fatalx("cannot run %s as %s: the user running %s "
2476 		    "must not be the superuser",
2477 		    getprogname(), pw->pw_name, getprogname());
2478 	}
2479 
2480 	if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1)
2481 		log_warnx("group membership list truncated");
2482 
2483 	gr = match_group(groups, ngroups, gotd.unix_group_name);
2484 	if (gr == NULL) {
2485 		fatalx("cannot start %s: the user running %s "
2486 		    "must be a secondary member of group %s",
2487 		    getprogname(), getprogname(), gotd.unix_group_name);
2488 	}
2489 	if (gr->gr_gid == pw->pw_gid) {
2490 		fatalx("cannot start %s: the user running %s "
2491 		    "must be a secondary member of group %s, but "
2492 		    "%s is the user's primary group",
2493 		    getprogname(), getprogname(), gotd.unix_group_name,
2494 		    gotd.unix_group_name);
2495 	}
2496 
2497 	if (proc_id == PROC_LISTEN &&
2498 	    !got_path_is_absolute(gotd.unix_socket_path))
2499 		fatalx("bad unix socket path \"%s\": must be an absolute path",
2500 		    gotd.unix_socket_path);
2501 
2502 	if (noaction)
2503 		return 0;
2504 
2505 	if (proc_id == PROC_GOTD) {
2506 		gotd.pid = getpid();
2507 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2508 		start_listener(argv0, confpath, daemonize, verbosity);
2509 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
2510 		if (daemonize && daemon(1, 0) == -1)
2511 			fatal("daemon");
2512 	} else if (proc_id == PROC_LISTEN) {
2513 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2514 		if (verbosity) {
2515 			log_info("socket: %s", gotd.unix_socket_path);
2516 			log_info("user: %s", pw->pw_name);
2517 			log_info("secondary group: %s", gr->gr_name);
2518 		}
2519 
2520 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
2521 		    gr->gr_gid);
2522 		if (fd == -1) {
2523 			fatal("cannot listen on unix socket %s",
2524 			    gotd.unix_socket_path);
2525 		}
2526 		if (daemonize && daemon(0, 0) == -1)
2527 			fatal("daemon");
2528 	} else if (proc_id == PROC_AUTH) {
2529 		snprintf(title, sizeof(title), "%s %s",
2530 		    gotd_proc_names[proc_id], repo_path);
2531 		if (daemonize && daemon(0, 0) == -1)
2532 			fatal("daemon");
2533 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE) {
2534 		error = got_repo_pack_fds_open(&pack_fds);
2535 		if (error != NULL)
2536 			fatalx("cannot open pack tempfiles: %s", error->msg);
2537 		error = got_repo_temp_fds_open(&temp_fds);
2538 		if (error != NULL)
2539 			fatalx("cannot open pack tempfiles: %s", error->msg);
2540 		if (repo_path == NULL)
2541 			fatalx("repository path not specified");
2542 		snprintf(title, sizeof(title), "%s %s",
2543 		    gotd_proc_names[proc_id], repo_path);
2544 		if (daemonize && daemon(0, 0) == -1)
2545 			fatal("daemon");
2546 	} else
2547 		fatal("invalid process id %d", proc_id);
2548 
2549 	setproctitle("%s", title);
2550 	log_procinit(title);
2551 
2552 	/* Drop root privileges. */
2553 	if (setgid(pw->pw_gid) == -1)
2554 		fatal("setgid %d failed", pw->pw_gid);
2555 	if (setuid(pw->pw_uid) == -1)
2556 		fatal("setuid %d failed", pw->pw_uid);
2557 
2558 	event_init();
2559 
2560 	switch (proc_id) {
2561 	case PROC_GOTD:
2562 #ifndef PROFILE
2563 		if (pledge("stdio rpath wpath cpath proc exec "
2564 		    "sendfd recvfd fattr flock unix unveil", NULL) == -1)
2565 			err(1, "pledge");
2566 #endif
2567 		break;
2568 	case PROC_LISTEN:
2569 #ifndef PROFILE
2570 		if (pledge("stdio sendfd unix", NULL) == -1)
2571 			err(1, "pledge");
2572 #endif
2573 		listen_main(title, fd);
2574 		/* NOTREACHED */
2575 		break;
2576 	case PROC_AUTH:
2577 #ifndef PROFILE
2578 		if (pledge("stdio getpw", NULL) == -1)
2579 			err(1, "pledge");
2580 #endif
2581 		auth_main(title, &gotd.repos, repo_path);
2582 		/* NOTREACHED */
2583 		break;
2584 	case PROC_REPO_READ:
2585 #ifndef PROFILE
2586 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2587 			err(1, "pledge");
2588 #endif
2589 		apply_unveil_repo_readonly(repo_path);
2590 		repo_read_main(title, repo_path, pack_fds, temp_fds);
2591 		/* NOTREACHED */
2592 		exit(0);
2593 	case PROC_REPO_WRITE:
2594 #ifndef PROFILE
2595 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
2596 			err(1, "pledge");
2597 #endif
2598 		apply_unveil_repo_readonly(repo_path);
2599 		repo_write_main(title, repo_path, pack_fds, temp_fds);
2600 		/* NOTREACHED */
2601 		exit(0);
2602 	default:
2603 		fatal("invalid process id %d", proc_id);
2604 	}
2605 
2606 	if (proc_id != PROC_GOTD)
2607 		fatal("invalid process id %d", proc_id);
2608 
2609 	apply_unveil();
2610 
2611 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2612 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2613 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2614 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2615 	signal(SIGPIPE, SIG_IGN);
2616 
2617 	signal_add(&evsigint, NULL);
2618 	signal_add(&evsigterm, NULL);
2619 	signal_add(&evsighup, NULL);
2620 	signal_add(&evsigusr1, NULL);
2621 
2622 	gotd_imsg_event_add(&gotd.listen_proc.iev);
2623 
2624 	event_dispatch();
2625 
2626 	if (pack_fds)
2627 		got_repo_pack_fds_close(pack_fds);
2628 	free(repo_path);
2629 	return 0;
2630 }