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Date:: Tue Jan 10 12:26:30 2023 UTC
Message:: remove now unused fields from struct gotd_client
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1 /*
2  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/tree.h>
19 #include <sys/time.h>
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <sys/socket.h>
23 #include <sys/un.h>
24 #include <sys/wait.h>
25 
26 #include <fcntl.h>
27 #include <err.h>
28 #include <errno.h>
29 #include <event.h>
30 #include <limits.h>
31 #include <pwd.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <signal.h>
35 #include <siphash.h>
36 #include <stdarg.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <syslog.h>
41 #include <unistd.h>
42 
43 #include "got_error.h"
44 #include "got_opentemp.h"
45 #include "got_path.h"
46 #include "got_repository.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 
50 #include "got_lib_delta.h"
51 #include "got_lib_object.h"
52 #include "got_lib_object_cache.h"
53 #include "got_lib_sha1.h"
54 #include "got_lib_gitproto.h"
55 #include "got_lib_pack.h"
56 #include "got_lib_repository.h"
57 
58 #include "gotd.h"
59 #include "log.h"
60 #include "listen.h"
61 #include "auth.h"
62 #include "session.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 	struct gotd_imsgev		 iev;
79 	struct event			 tmo;
80 	uid_t				 euid;
81 	gid_t				 egid;
82 	struct gotd_child_proc		*repo_read;
83 	struct gotd_child_proc		*repo_write;
84 	struct gotd_child_proc		*auth;
85 	struct gotd_child_proc		*session;
86 	int				 required_auth;
87 };
88 STAILQ_HEAD(gotd_clients, gotd_client);
89 
90 static struct gotd_clients gotd_clients[GOTD_CLIENT_TABLE_SIZE];
91 static SIPHASH_KEY clients_hash_key;
92 volatile int client_cnt;
93 static struct timeval auth_timeout = { 5, 0 };
94 static struct gotd gotd;
95 
96 void gotd_sighdlr(int sig, short event, void *arg);
97 static void gotd_shutdown(void);
98 static const struct got_error *start_session_child(struct gotd_client *,
99     struct gotd_repo *, char *, const char *, int, int);
100 static const struct got_error *start_repo_child(struct gotd_client *,
101     enum gotd_procid, struct gotd_repo *, char *, const char *, int, int);
102 static const struct got_error *start_auth_child(struct gotd_client *, int,
103     struct gotd_repo *, char *, const char *, int, int);
104 static void kill_proc(struct gotd_child_proc *, int);
105 
106 __dead static void
107 usage()
108 {
109 	fprintf(stderr, "usage: %s [-dv] [-f config-file]\n", getprogname());
110 	exit(1);
111 }
112 
113 static int
114 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
115 {
116 	struct sockaddr_un sun;
117 	int fd = -1;
118 	mode_t old_umask, mode;
119 
120 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
121 	if (fd == -1) {
122 		log_warn("socket");
123 		return -1;
124 	}
125 
126 	sun.sun_family = AF_UNIX;
127 	if (strlcpy(sun.sun_path, unix_socket_path,
128 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
129 		log_warnx("%s: name too long", unix_socket_path);
130 		close(fd);
131 		return -1;
132 	}
133 
134 	if (unlink(unix_socket_path) == -1) {
135 		if (errno != ENOENT) {
136 			log_warn("unlink %s", unix_socket_path);
137 			close(fd);
138 			return -1;
139 		}
140 	}
141 
142 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
143 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
144 
145 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
146 		log_warn("bind: %s", unix_socket_path);
147 		close(fd);
148 		umask(old_umask);
149 		return -1;
150 	}
151 
152 	umask(old_umask);
153 
154 	if (chmod(unix_socket_path, mode) == -1) {
155 		log_warn("chmod %o %s", mode, unix_socket_path);
156 		close(fd);
157 		unlink(unix_socket_path);
158 		return -1;
159 	}
160 
161 	if (chown(unix_socket_path, uid, gid) == -1) {
162 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
163 		close(fd);
164 		unlink(unix_socket_path);
165 		return -1;
166 	}
167 
168 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
169 		log_warn("listen");
170 		close(fd);
171 		unlink(unix_socket_path);
172 		return -1;
173 	}
174 
175 	return fd;
176 }
177 
178 static uint64_t
179 client_hash(uint32_t client_id)
180 {
181 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
182 }
183 
184 static void
185 add_client(struct gotd_client *client)
186 {
187 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
188 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
189 	client_cnt++;
190 }
191 
192 static struct gotd_client *
193 find_client(uint32_t client_id)
194 {
195 	uint64_t slot;
196 	struct gotd_client *c;
197 
198 	slot = client_hash(client_id) % nitems(gotd_clients);
199 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
200 		if (c->id == client_id)
201 			return c;
202 	}
203 
204 	return NULL;
205 }
206 
207 static struct gotd_child_proc *
208 get_client_repo_proc(struct gotd_client *client)
209 {
210 	if (client->repo_read && client->repo_write) {
211 		fatalx("uid %d is reading and writing in the same session",
212 		    client->euid);
213 		/* NOTREACHED */
214 	}
215 
216 	if (client->repo_read)
217 		return client->repo_read;
218 	else if (client->repo_write)
219 		return client->repo_write;
220 
221 	return NULL;
222 }
223 
224 static struct gotd_client *
225 find_client_by_proc_fd(int fd)
226 {
227 	uint64_t slot;
228 
229 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
230 		struct gotd_client *c;
231 
232 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
233 			struct gotd_child_proc *proc = get_client_repo_proc(c);
234 			if (proc && proc->iev.ibuf.fd == fd)
235 				return c;
236 			if (c->auth && c->auth->iev.ibuf.fd == fd)
237 				return c;
238 			if (c->session && c->session->iev.ibuf.fd == fd)
239 				return c;
240 		}
241 	}
242 
243 	return NULL;
244 }
245 
246 static int
247 client_is_reading(struct gotd_client *client)
248 {
249 	return client->repo_read != NULL;
250 }
251 
252 static int
253 client_is_writing(struct gotd_client *client)
254 {
255 	return client->repo_write != NULL;
256 }
257 
258 static const struct got_error *
259 ensure_client_is_not_writing(struct gotd_client *client)
260 {
261 	if (client_is_writing(client)) {
262 		return got_error_fmt(GOT_ERR_BAD_PACKET,
263 		    "uid %d made a read-request but is writing to "
264 		    "a repository", client->euid);
265 	}
266 
267 	return NULL;
268 }
269 
270 static const struct got_error *
271 ensure_client_is_not_reading(struct gotd_client *client)
272 {
273 	if (client_is_reading(client)) {
274 		return got_error_fmt(GOT_ERR_BAD_PACKET,
275 		    "uid %d made a write-request but is reading from "
276 		    "a repository", client->euid);
277 	}
278 
279 	return NULL;
280 }
281 
282 static void
283 wait_for_child(pid_t child_pid)
284 {
285 	pid_t pid;
286 	int status;
287 
288 	log_debug("waiting for child PID %ld to terminate",
289 	    (long)child_pid);
290 
291 	do {
292 		pid = waitpid(child_pid, &status, WNOHANG);
293 		if (pid == -1) {
294 			if (errno != EINTR && errno != ECHILD)
295 				fatal("wait");
296 		} else if (WIFSIGNALED(status)) {
297 			log_warnx("child PID %ld terminated; signal %d",
298 			    (long)pid, WTERMSIG(status));
299 		}
300 	} while (pid != -1 || (pid == -1 && errno == EINTR));
301 }
302 
303 static void
304 proc_done(struct gotd_child_proc *proc)
305 {
306 	event_del(&proc->iev.ev);
307 	msgbuf_clear(&proc->iev.ibuf.w);
308 	close(proc->iev.ibuf.fd);
309 	kill_proc(proc, 0);
310 	wait_for_child(proc->pid);
311 	free(proc);
312 }
313 
314 static void
315 kill_auth_proc(struct gotd_client *client)
316 {
317 	struct gotd_child_proc *proc;
318 
319 	if (client->auth == NULL)
320 		return;
321 
322 	proc = client->auth;
323 	client->auth = NULL;
324 
325 	proc_done(proc);
326 }
327 
328 static void
329 kill_session_proc(struct gotd_client *client)
330 {
331 	struct gotd_child_proc *proc;
332 
333 	if (client->session == NULL)
334 		return;
335 
336 	proc = client->session;
337 	client->session = NULL;
338 
339 	proc_done(proc);
340 }
341 
342 static void
343 disconnect(struct gotd_client *client)
344 {
345 	struct gotd_imsg_disconnect idisconnect;
346 	struct gotd_child_proc *proc = get_client_repo_proc(client);
347 	struct gotd_child_proc *listen_proc = &gotd.listen_proc;
348 	uint64_t slot;
349 
350 	log_debug("uid %d: disconnecting", client->euid);
351 
352 	kill_auth_proc(client);
353 	kill_session_proc(client);
354 
355 	idisconnect.client_id = client->id;
356 	if (proc) {
357 		if (gotd_imsg_compose_event(&proc->iev,
358 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
359 		    &idisconnect, sizeof(idisconnect)) == -1)
360 			log_warn("imsg compose DISCONNECT");
361 
362 		msgbuf_clear(&proc->iev.ibuf.w);
363 		close(proc->iev.ibuf.fd);
364 		kill_proc(proc, 0);
365 		wait_for_child(proc->pid);
366 		free(proc);
367 		proc = NULL;
368 	}
369 
370 	if (gotd_imsg_compose_event(&listen_proc->iev,
371 	    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
372 	    &idisconnect, sizeof(idisconnect)) == -1)
373 		log_warn("imsg compose DISCONNECT");
374 
375 	slot = client_hash(client->id) % nitems(gotd_clients);
376 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
377 	imsg_clear(&client->iev.ibuf);
378 	event_del(&client->iev.ev);
379 	evtimer_del(&client->tmo);
380 	if (client->fd != -1)
381 		close(client->fd);
382 	else if (client->iev.ibuf.fd != -1)
383 		close(client->iev.ibuf.fd);
384 	free(client->capabilities);
385 	free(client);
386 	client_cnt--;
387 }
388 
389 static void
390 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
391 {
392 	struct imsgbuf ibuf;
393 
394 	log_warnx("uid %d: %s", client->euid, err->msg);
395 	if (err->code != GOT_ERR_EOF && client->fd != -1) {
396 		imsg_init(&ibuf, client->fd);
397 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
398 		imsg_clear(&ibuf);
399 	}
400 	disconnect(client);
401 }
402 
403 static const struct got_error *
404 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
405 {
406 	const struct got_error *err = NULL;
407 	struct gotd_imsg_info_repo irepo;
408 
409 	memset(&irepo, 0, sizeof(irepo));
410 
411 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
412 	    >= sizeof(irepo.repo_name))
413 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
414 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
415 	    >= sizeof(irepo.repo_path))
416 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
417 
418 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
419 	    &irepo, sizeof(irepo)) == -1) {
420 		err = got_error_from_errno("imsg compose INFO_REPO");
421 		if (err)
422 			return err;
423 	}
424 
425 	return NULL;
426 }
427 
428 static const struct got_error *
429 send_capability(struct gotd_client_capability *capa, struct gotd_imsgev* iev)
430 {
431 	const struct got_error *err = NULL;
432 	struct gotd_imsg_capability icapa;
433 	size_t len;
434 	struct ibuf *wbuf;
435 
436 	memset(&icapa, 0, sizeof(icapa));
437 
438 	icapa.key_len = strlen(capa->key);
439 	len = sizeof(icapa) + icapa.key_len;
440 	if (capa->value) {
441 		icapa.value_len = strlen(capa->value);
442 		len += icapa.value_len;
443 	}
444 
445 	wbuf = imsg_create(&iev->ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
446 	if (wbuf == NULL) {
447 		err = got_error_from_errno("imsg_create CAPABILITY");
448 		return err;
449 	}
450 
451 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
452 		return got_error_from_errno("imsg_add CAPABILITY");
453 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
454 		return got_error_from_errno("imsg_add CAPABILITY");
455 	if (capa->value) {
456 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
457 			return got_error_from_errno("imsg_add CAPABILITY");
458 	}
459 
460 	wbuf->fd = -1;
461 	imsg_close(&iev->ibuf, wbuf);
462 
463 	gotd_imsg_event_add(iev);
464 
465 	return NULL;
466 }
467 
468 static const struct got_error *
469 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
470 {
471 	const struct got_error *err = NULL;
472 	struct gotd_imsg_info_client iclient;
473 	struct gotd_child_proc *proc;
474 	size_t i;
475 
476 	memset(&iclient, 0, sizeof(iclient));
477 	iclient.euid = client->euid;
478 	iclient.egid = client->egid;
479 
480 	proc = get_client_repo_proc(client);
481 	if (proc) {
482 		if (strlcpy(iclient.repo_name, proc->repo_path,
483 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
484 			return got_error_msg(GOT_ERR_NO_SPACE,
485 			    "repo name too long");
486 		}
487 		if (client_is_writing(client))
488 			iclient.is_writing = 1;
489 
490 		iclient.repo_child_pid = proc->pid;
491 	}
492 
493 	iclient.state = client->state;
494 	if (client->session)
495 		iclient.session_child_pid = client->session->pid;
496 	iclient.ncapabilities = client->ncapabilities;
497 
498 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
499 	    &iclient, sizeof(iclient)) == -1) {
500 		err = got_error_from_errno("imsg compose INFO_CLIENT");
501 		if (err)
502 			return err;
503 	}
504 
505 	for (i = 0; i < client->ncapabilities; i++) {
506 		struct gotd_client_capability *capa;
507 		capa = &client->capabilities[i];
508 		err = send_capability(capa, iev);
509 		if (err)
510 			return err;
511 	}
512 
513 	return NULL;
514 }
515 
516 static const struct got_error *
517 send_info(struct gotd_client *client)
518 {
519 	const struct got_error *err = NULL;
520 	struct gotd_imsg_info info;
521 	uint64_t slot;
522 	struct gotd_repo *repo;
523 
524 	if (client->euid != 0)
525 		return got_error_set_errno(EPERM, "info");
526 
527 	info.pid = gotd.pid;
528 	info.verbosity = gotd.verbosity;
529 	info.nrepos = gotd.nrepos;
530 	info.nclients = client_cnt - 1;
531 
532 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
533 	    &info, sizeof(info)) == -1) {
534 		err = got_error_from_errno("imsg compose INFO");
535 		if (err)
536 			return err;
537 	}
538 
539 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
540 		err = send_repo_info(&client->iev, repo);
541 		if (err)
542 			return err;
543 	}
544 
545 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
546 		struct gotd_client *c;
547 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
548 			if (c->id == client->id)
549 				continue;
550 			err = send_client_info(&client->iev, c);
551 			if (err)
552 				return err;
553 		}
554 	}
555 
556 	return NULL;
557 }
558 
559 static const struct got_error *
560 stop_gotd(struct gotd_client *client)
561 {
562 
563 	if (client->euid != 0)
564 		return got_error_set_errno(EPERM, "stop");
565 
566 	gotd_shutdown();
567 	/* NOTREACHED */
568 	return NULL;
569 }
570 
571 static struct gotd_repo *
572 find_repo_by_name(const char *repo_name)
573 {
574 	struct gotd_repo *repo;
575 	size_t namelen;
576 
577 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
578 		namelen = strlen(repo->name);
579 		if (strncmp(repo->name, repo_name, namelen) != 0)
580 			continue;
581 		if (repo_name[namelen] == '\0' ||
582 		    strcmp(&repo_name[namelen], ".git") == 0)
583 			return repo;
584 	}
585 
586 	return NULL;
587 }
588 
589 static const struct got_error *
590 start_client_authentication(struct gotd_client *client, struct imsg *imsg)
591 {
592 	const struct got_error *err;
593 	struct gotd_imsg_list_refs ireq;
594 	struct gotd_repo *repo = NULL;
595 	size_t datalen;
596 
597 	log_debug("list-refs request from uid %d", client->euid);
598 
599 	if (client->state != GOTD_STATE_EXPECT_LIST_REFS)
600 		return got_error_msg(GOT_ERR_BAD_REQUEST,
601 		    "unexpected list-refs request received");
602 
603 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
604 	if (datalen != sizeof(ireq))
605 		return got_error(GOT_ERR_PRIVSEP_LEN);
606 
607 	memcpy(&ireq, imsg->data, datalen);
608 
609 	if (ireq.client_is_reading) {
610 		err = ensure_client_is_not_writing(client);
611 		if (err)
612 			return err;
613 		repo = find_repo_by_name(ireq.repo_name);
614 		if (repo == NULL)
615 			return got_error(GOT_ERR_NOT_GIT_REPO);
616 		err = start_auth_child(client, GOTD_AUTH_READ, repo,
617 		    gotd.argv0, gotd.confpath, gotd.daemonize,
618 		    gotd.verbosity);
619 		if (err)
620 			return err;
621 	} else {
622 		err = ensure_client_is_not_reading(client);
623 		if (err)
624 			return err;
625 		repo = find_repo_by_name(ireq.repo_name);
626 		if (repo == NULL)
627 			return got_error(GOT_ERR_NOT_GIT_REPO);
628 		err = start_auth_child(client,
629 		    GOTD_AUTH_READ | GOTD_AUTH_WRITE,
630 		    repo, gotd.argv0, gotd.confpath, gotd.daemonize,
631 		    gotd.verbosity);
632 		if (err)
633 			return err;
634 	}
635 
636 	evtimer_add(&client->tmo, &auth_timeout);
637 
638 	/* Flow continues upon authentication successs/failure or timeout. */
639 	return NULL;
640 }
641 
642 static void
643 gotd_request(int fd, short events, void *arg)
644 {
645 	struct gotd_imsgev *iev = arg;
646 	struct imsgbuf *ibuf = &iev->ibuf;
647 	struct gotd_client *client = iev->handler_arg;
648 	const struct got_error *err = NULL;
649 	struct imsg imsg;
650 	ssize_t n;
651 
652 	if (events & EV_WRITE) {
653 		while (ibuf->w.queued) {
654 			n = msgbuf_write(&ibuf->w);
655 			if (n == -1 && errno == EPIPE) {
656 				/*
657 				 * The client has closed its socket.
658 				 * This can happen when Git clients are
659 				 * done sending pack file data.
660 				 */
661 				msgbuf_clear(&ibuf->w);
662 				continue;
663 			} else if (n == -1 && errno != EAGAIN) {
664 				err = got_error_from_errno("imsg_flush");
665 				disconnect_on_error(client, err);
666 				return;
667 			}
668 			if (n == 0) {
669 				/* Connection closed. */
670 				err = got_error(GOT_ERR_EOF);
671 				disconnect_on_error(client, err);
672 				return;
673 			}
674 		}
675 
676 		/* Disconnect gotctl(8) now that messages have been sent. */
677 		if (!client_is_reading(client) && !client_is_writing(client)) {
678 			disconnect(client);
679 			return;
680 		}
681 	}
682 
683 	if ((events & EV_READ) == 0)
684 		return;
685 
686 	memset(&imsg, 0, sizeof(imsg));
687 
688 	while (err == NULL) {
689 		err = gotd_imsg_recv(&imsg, ibuf, 0);
690 		if (err) {
691 			if (err->code == GOT_ERR_PRIVSEP_READ)
692 				err = NULL;
693 			break;
694 		}
695 
696 		evtimer_del(&client->tmo);
697 
698 		switch (imsg.hdr.type) {
699 		case GOTD_IMSG_INFO:
700 			err = send_info(client);
701 			break;
702 		case GOTD_IMSG_STOP:
703 			err = stop_gotd(client);
704 			break;
705 		case GOTD_IMSG_LIST_REFS:
706 			err = start_client_authentication(client, &imsg);
707 			break;
708 		default:
709 			log_debug("unexpected imsg %d", imsg.hdr.type);
710 			err = got_error(GOT_ERR_PRIVSEP_MSG);
711 			break;
712 		}
713 
714 		imsg_free(&imsg);
715 	}
716 
717 	if (err) {
718 		if (err->code != GOT_ERR_EOF ||
719 		    client->state != GOTD_STATE_EXPECT_PACKFILE)
720 			disconnect_on_error(client, err);
721 	} else {
722 		gotd_imsg_event_add(&client->iev);
723 	}
724 }
725 
726 static void
727 gotd_auth_timeout(int fd, short events, void *arg)
728 {
729 	struct gotd_client *client = arg;
730 
731 	log_debug("disconnecting uid %d due to authentication timeout",
732 	    client->euid);
733 	disconnect(client);
734 }
735 
736 static const struct got_error *
737 recv_connect(uint32_t *client_id, struct imsg *imsg)
738 {
739 	const struct got_error *err = NULL;
740 	struct gotd_imsg_connect iconnect;
741 	size_t datalen;
742 	int s = -1;
743 	struct gotd_client *client = NULL;
744 
745 	*client_id = 0;
746 
747 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
748 	if (datalen != sizeof(iconnect))
749 		return got_error(GOT_ERR_PRIVSEP_LEN);
750 	memcpy(&iconnect, imsg->data, sizeof(iconnect));
751 
752 	s = imsg->fd;
753 	if (s == -1) {
754 		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
755 		goto done;
756 	}
757 
758 	if (find_client(iconnect.client_id)) {
759 		err = got_error_msg(GOT_ERR_CLIENT_ID, "duplicate client ID");
760 		goto done;
761 	}
762 
763 	client = calloc(1, sizeof(*client));
764 	if (client == NULL) {
765 		err = got_error_from_errno("calloc");
766 		goto done;
767 	}
768 
769 	*client_id = iconnect.client_id;
770 
771 	client->state = GOTD_STATE_EXPECT_LIST_REFS;
772 	client->id = iconnect.client_id;
773 	client->fd = s;
774 	s = -1;
775 	/* The auth process will verify UID/GID for us. */
776 	client->euid = iconnect.euid;
777 	client->egid = iconnect.egid;
778 
779 	imsg_init(&client->iev.ibuf, client->fd);
780 	client->iev.handler = gotd_request;
781 	client->iev.events = EV_READ;
782 	client->iev.handler_arg = client;
783 
784 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
785 	    &client->iev);
786 	gotd_imsg_event_add(&client->iev);
787 
788 	evtimer_set(&client->tmo, gotd_auth_timeout, client);
789 
790 	add_client(client);
791 	log_debug("%s: new client uid %d connected on fd %d", __func__,
792 	    client->euid, client->fd);
793 done:
794 	if (err) {
795 		struct gotd_child_proc *listen_proc = &gotd.listen_proc;
796 		struct gotd_imsg_disconnect idisconnect;
797 
798 		idisconnect.client_id = client->id;
799 		if (gotd_imsg_compose_event(&listen_proc->iev,
800 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
801 		    &idisconnect, sizeof(idisconnect)) == -1)
802 			log_warn("imsg compose DISCONNECT");
803 
804 		if (s != -1)
805 			close(s);
806 	}
807 
808 	return err;
809 }
810 
811 static const char *gotd_proc_names[PROC_MAX] = {
812 	"parent",
813 	"listen",
814 	"auth",
815 	"session",
816 	"repo_read",
817 	"repo_write"
818 };
819 
820 static void
821 kill_proc(struct gotd_child_proc *proc, int fatal)
822 {
823 	if (fatal) {
824 		log_warnx("sending SIGKILL to PID %d", proc->pid);
825 		kill(proc->pid, SIGKILL);
826 	} else
827 		kill(proc->pid, SIGTERM);
828 }
829 
830 static void
831 gotd_shutdown(void)
832 {
833 	struct gotd_child_proc *proc;
834 	uint64_t slot;
835 
836 	log_debug("shutting down");
837 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
838 		struct gotd_client *c, *tmp;
839 
840 		STAILQ_FOREACH_SAFE(c, &gotd_clients[slot], entry, tmp)
841 			disconnect(c);
842 	}
843 
844 	proc = &gotd.listen_proc;
845 	msgbuf_clear(&proc->iev.ibuf.w);
846 	close(proc->iev.ibuf.fd);
847 	kill_proc(proc, 0);
848 	wait_for_child(proc->pid);
849 
850 	log_info("terminating");
851 	exit(0);
852 }
853 
854 void
855 gotd_sighdlr(int sig, short event, void *arg)
856 {
857 	/*
858 	 * Normal signal handler rules don't apply because libevent
859 	 * decouples for us.
860 	 */
861 
862 	switch (sig) {
863 	case SIGHUP:
864 		log_info("%s: ignoring SIGHUP", __func__);
865 		break;
866 	case SIGUSR1:
867 		log_info("%s: ignoring SIGUSR1", __func__);
868 		break;
869 	case SIGTERM:
870 	case SIGINT:
871 		gotd_shutdown();
872 		break;
873 	default:
874 		fatalx("unexpected signal");
875 	}
876 }
877 
878 static const struct got_error *
879 ensure_proc_is_reading(struct gotd_client *client,
880     struct gotd_child_proc *proc)
881 {
882 	if (!client_is_reading(client)) {
883 		kill_proc(proc, 1);
884 		return got_error_fmt(GOT_ERR_BAD_PACKET,
885 		    "PID %d handled a read-request for uid %d but this "
886 		    "user is not reading from a repository", proc->pid,
887 		    client->euid);
888 	}
889 
890 	return NULL;
891 }
892 
893 static const struct got_error *
894 ensure_proc_is_writing(struct gotd_client *client,
895     struct gotd_child_proc *proc)
896 {
897 	if (!client_is_writing(client)) {
898 		kill_proc(proc, 1);
899 		return got_error_fmt(GOT_ERR_BAD_PACKET,
900 		    "PID %d handled a write-request for uid %d but this "
901 		    "user is not writing to a repository", proc->pid,
902 		    client->euid);
903 	}
904 
905 	return NULL;
906 }
907 
908 static int
909 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
910     struct imsg *imsg)
911 {
912 	const struct got_error *err;
913 	struct gotd_child_proc *client_proc;
914 	int ret = 0;
915 
916 	if (proc->type == PROC_REPO_READ || proc->type == PROC_REPO_WRITE) {
917 		client_proc = get_client_repo_proc(client);
918 		if (client_proc == NULL)
919 			fatalx("no process found for uid %d", client->euid);
920 		if (proc->pid != client_proc->pid) {
921 			kill_proc(proc, 1);
922 			log_warnx("received message from PID %d for uid %d, "
923 			    "while PID %d is the process serving this user",
924 			    proc->pid, client->euid, client_proc->pid);
925 			return 0;
926 		}
927 	}
928 	if (proc->type == PROC_SESSION) {
929 		if (client->session == NULL) {
930 			log_warnx("no session found for uid %d", client->euid);
931 			return 0;
932 		}
933 		if (proc->pid != client->session->pid) {
934 			kill_proc(proc, 1);
935 			log_warnx("received message from PID %d for uid %d, "
936 			    "while PID %d is the process serving this user",
937 			    proc->pid, client->euid, client->session->pid);
938 			return 0;
939 		}
940 	}
941 
942 	switch (imsg->hdr.type) {
943 	case GOTD_IMSG_ERROR:
944 		ret = 1;
945 		break;
946 	case GOTD_IMSG_CONNECT:
947 		if (proc->type != PROC_LISTEN) {
948 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
949 			    "new connection for uid %d from PID %d "
950 			    "which is not the listen process",
951 			    proc->pid, client->euid);
952 		} else
953 			ret = 1;
954 		break;
955 	case GOTD_IMSG_ACCESS_GRANTED:
956 		if (proc->type != PROC_AUTH) {
957 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
958 			    "authentication of uid %d from PID %d "
959 			    "which is not the auth process",
960 			    proc->pid, client->euid);
961 		} else
962 			ret = 1;
963 		break;
964 	case GOTD_IMSG_CLIENT_SESSION_READY:
965 		if (proc->type != PROC_SESSION) {
966 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
967 			    "unexpected \"ready\" signal from PID %d",
968 			    proc->pid);
969 		} else
970 			ret = 1;
971 		break;
972 	case GOTD_IMSG_REPO_CHILD_READY:
973 		if (proc->type != PROC_REPO_READ &&
974 		    proc->type != PROC_REPO_WRITE) {
975 			err = got_error_fmt(GOT_ERR_BAD_PACKET,
976 			    "unexpected \"ready\" signal from PID %d",
977 			    proc->pid);
978 		} else
979 			ret = 1;
980 		break;
981 	case GOTD_IMSG_PACKFILE_DONE:
982 		err = ensure_proc_is_reading(client, proc);
983 		if (err)
984 			log_warnx("uid %d: %s", client->euid, err->msg);
985 		else
986 			ret = 1;
987 		break;
988 	case GOTD_IMSG_PACKFILE_INSTALL:
989 	case GOTD_IMSG_REF_UPDATES_START:
990 	case GOTD_IMSG_REF_UPDATE:
991 		err = ensure_proc_is_writing(client, proc);
992 		if (err)
993 			log_warnx("uid %d: %s", client->euid, err->msg);
994 		else
995 			ret = 1;
996 		break;
997 	default:
998 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
999 		break;
1000 	}
1001 
1002 	return ret;
1003 }
1004 
1005 static const struct got_error *
1006 connect_repo_child(struct gotd_client *client,
1007     struct gotd_child_proc *repo_proc)
1008 {
1009 	static const struct got_error *err;
1010 	struct gotd_imsgev *session_iev = &client->session->iev;
1011 	struct gotd_imsg_connect_repo_child ireq;
1012 	int pipe[2];
1013 
1014 	if (client->state != GOTD_STATE_EXPECT_LIST_REFS)
1015 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1016 		    "unexpected repo child ready signal received");
1017 
1018 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1019 	    PF_UNSPEC, pipe) == -1)
1020 		fatal("socketpair");
1021 
1022 	memset(&ireq, 0, sizeof(ireq));
1023 	ireq.client_id = client->id;
1024 	ireq.proc_id = repo_proc->type;
1025 
1026 	/* Pass repo child pipe to session child process. */
1027 	if (gotd_imsg_compose_event(session_iev, GOTD_IMSG_CONNECT_REPO_CHILD,
1028 	    PROC_GOTD, pipe[0], &ireq, sizeof(ireq)) == -1) {
1029 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1030 		close(pipe[0]);
1031 		close(pipe[1]);
1032 		return err;
1033 	}
1034 
1035 	/* Pass session child pipe to repo child process. */
1036 	if (gotd_imsg_compose_event(&repo_proc->iev,
1037 	    GOTD_IMSG_CONNECT_REPO_CHILD, PROC_GOTD, pipe[1], NULL, 0) == -1) {
1038 		err = got_error_from_errno("imsg compose CONNECT_REPO_CHILD");
1039 		close(pipe[1]);
1040 		return err;
1041 	}
1042 
1043 	return NULL;
1044 }
1045 
1046 static void
1047 gotd_dispatch_listener(int fd, short event, void *arg)
1048 {
1049 	struct gotd_imsgev *iev = arg;
1050 	struct imsgbuf *ibuf = &iev->ibuf;
1051 	struct gotd_child_proc *proc = &gotd.listen_proc;
1052 	ssize_t n;
1053 	int shut = 0;
1054 	struct imsg imsg;
1055 
1056 	if (proc->iev.ibuf.fd != fd)
1057 		fatalx("%s: unexpected fd %d", __func__, fd);
1058 
1059 	if (event & EV_READ) {
1060 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1061 			fatal("imsg_read error");
1062 		if (n == 0) {
1063 			/* Connection closed. */
1064 			shut = 1;
1065 			goto done;
1066 		}
1067 	}
1068 
1069 	if (event & EV_WRITE) {
1070 		n = msgbuf_write(&ibuf->w);
1071 		if (n == -1 && errno != EAGAIN)
1072 			fatal("msgbuf_write");
1073 		if (n == 0) {
1074 			/* Connection closed. */
1075 			shut = 1;
1076 			goto done;
1077 		}
1078 	}
1079 
1080 	for (;;) {
1081 		const struct got_error *err = NULL;
1082 		struct gotd_client *client = NULL;
1083 		uint32_t client_id = 0;
1084 		int do_disconnect = 0;
1085 
1086 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1087 			fatal("%s: imsg_get error", __func__);
1088 		if (n == 0)	/* No more messages. */
1089 			break;
1090 
1091 		switch (imsg.hdr.type) {
1092 		case GOTD_IMSG_ERROR:
1093 			do_disconnect = 1;
1094 			err = gotd_imsg_recv_error(&client_id, &imsg);
1095 			break;
1096 		case GOTD_IMSG_CONNECT:
1097 			err = recv_connect(&client_id, &imsg);
1098 			break;
1099 		default:
1100 			log_debug("unexpected imsg %d", imsg.hdr.type);
1101 			break;
1102 		}
1103 
1104 		client = find_client(client_id);
1105 		if (client == NULL) {
1106 			log_warnx("%s: client not found", __func__);
1107 			imsg_free(&imsg);
1108 			continue;
1109 		}
1110 
1111 		if (err)
1112 			log_warnx("uid %d: %s", client->euid, err->msg);
1113 
1114 		if (do_disconnect) {
1115 			if (err)
1116 				disconnect_on_error(client, err);
1117 			else
1118 				disconnect(client);
1119 		}
1120 
1121 		imsg_free(&imsg);
1122 	}
1123 done:
1124 	if (!shut) {
1125 		gotd_imsg_event_add(iev);
1126 	} else {
1127 		/* This pipe is dead. Remove its event handler */
1128 		event_del(&iev->ev);
1129 		event_loopexit(NULL);
1130 	}
1131 }
1132 
1133 static void
1134 gotd_dispatch_auth_child(int fd, short event, void *arg)
1135 {
1136 	const struct got_error *err = NULL;
1137 	struct gotd_imsgev *iev = arg;
1138 	struct imsgbuf *ibuf = &iev->ibuf;
1139 	struct gotd_client *client;
1140 	struct gotd_repo *repo = NULL;
1141 	ssize_t n;
1142 	int shut = 0;
1143 	struct imsg imsg;
1144 	uint32_t client_id = 0;
1145 	int do_disconnect = 0;
1146 
1147 	client = find_client_by_proc_fd(fd);
1148 	if (client == NULL)
1149 		fatalx("cannot find client for fd %d", fd);
1150 
1151 	if (client->auth == NULL)
1152 		fatalx("cannot find auth child process for fd %d", fd);
1153 
1154 	if (event & EV_READ) {
1155 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1156 			fatal("imsg_read error");
1157 		if (n == 0) {
1158 			/* Connection closed. */
1159 			shut = 1;
1160 			goto done;
1161 		}
1162 	}
1163 
1164 	if (event & EV_WRITE) {
1165 		n = msgbuf_write(&ibuf->w);
1166 		if (n == -1 && errno != EAGAIN)
1167 			fatal("msgbuf_write");
1168 		if (n == 0) {
1169 			/* Connection closed. */
1170 			shut = 1;
1171 		}
1172 		goto done;
1173 	}
1174 
1175 	if (client->auth->iev.ibuf.fd != fd)
1176 		fatalx("%s: unexpected fd %d", __func__, fd);
1177 
1178 	if ((n = imsg_get(ibuf, &imsg)) == -1)
1179 		fatal("%s: imsg_get error", __func__);
1180 	if (n == 0)	/* No more messages. */
1181 		return;
1182 
1183 	evtimer_del(&client->tmo);
1184 
1185 	switch (imsg.hdr.type) {
1186 	case GOTD_IMSG_ERROR:
1187 		do_disconnect = 1;
1188 		err = gotd_imsg_recv_error(&client_id, &imsg);
1189 		break;
1190 	case GOTD_IMSG_ACCESS_GRANTED:
1191 		break;
1192 	default:
1193 		do_disconnect = 1;
1194 		log_debug("unexpected imsg %d", imsg.hdr.type);
1195 		break;
1196 	}
1197 
1198 	if (!verify_imsg_src(client, client->auth, &imsg)) {
1199 		do_disconnect = 1;
1200 		log_debug("dropping imsg type %d from PID %d",
1201 		    imsg.hdr.type, client->auth->pid);
1202 	}
1203 	imsg_free(&imsg);
1204 
1205 	if (do_disconnect) {
1206 		if (err)
1207 			disconnect_on_error(client, err);
1208 		else
1209 			disconnect(client);
1210 		goto done;
1211 	}
1212 
1213 	repo = find_repo_by_name(client->auth->repo_name);
1214 	if (repo == NULL) {
1215 		err = got_error(GOT_ERR_NOT_GIT_REPO);
1216 		goto done;
1217 	}
1218 	kill_auth_proc(client);
1219 
1220 	log_info("authenticated uid %d for repository %s\n",
1221 	    client->euid, repo->name);
1222 
1223 	err = start_session_child(client, repo, gotd.argv0,
1224 	    gotd.confpath, gotd.daemonize, gotd.verbosity);
1225 	if (err)
1226 		goto done;
1227 done:
1228 	if (err)
1229 		log_warnx("uid %d: %s", client->euid, err->msg);
1230 
1231 	/* We might have killed the auth process by now. */
1232 	if (client->auth != NULL) {
1233 		if (!shut) {
1234 			gotd_imsg_event_add(iev);
1235 		} else {
1236 			/* This pipe is dead. Remove its event handler */
1237 			event_del(&iev->ev);
1238 		}
1239 	}
1240 }
1241 
1242 static const struct got_error *
1243 connect_session(struct gotd_client *client)
1244 {
1245 	const struct got_error *err = NULL;
1246 	struct gotd_imsg_connect iconnect;
1247 	int s;
1248 
1249 	memset(&iconnect, 0, sizeof(iconnect));
1250 
1251 	s = dup(client->fd);
1252 	if (s == -1)
1253 		return got_error_from_errno("dup");
1254 
1255 	iconnect.client_id = client->id;
1256 	iconnect.euid = client->euid;
1257 	iconnect.egid = client->egid;
1258 
1259 	if (gotd_imsg_compose_event(&client->session->iev, GOTD_IMSG_CONNECT,
1260 	    PROC_GOTD, s, &iconnect, sizeof(iconnect)) == -1) {
1261 		err = got_error_from_errno("imsg compose CONNECT");
1262 		close(s);
1263 		return err;
1264 	}
1265 
1266 	/*
1267 	 * We are no longer interested in messages from this client.
1268 	 * Further client requests will be handled by the session process.
1269 	 */
1270 	msgbuf_clear(&client->iev.ibuf.w);
1271 	imsg_clear(&client->iev.ibuf);
1272 	event_del(&client->iev.ev);
1273 	client->fd = -1; /* will be closed via copy in client->iev.ibuf.fd */
1274 
1275 	return NULL;
1276 }
1277 
1278 static void
1279 gotd_dispatch_client_session(int fd, short event, void *arg)
1280 {
1281 	struct gotd_imsgev *iev = arg;
1282 	struct imsgbuf *ibuf = &iev->ibuf;
1283 	struct gotd_child_proc *proc = NULL;
1284 	struct gotd_client *client = NULL;
1285 	ssize_t n;
1286 	int shut = 0;
1287 	struct imsg imsg;
1288 
1289 	client = find_client_by_proc_fd(fd);
1290 	if (client == NULL)
1291 		fatalx("cannot find client for fd %d", fd);
1292 
1293 	if (event & EV_READ) {
1294 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1295 			fatal("imsg_read error");
1296 		if (n == 0) {
1297 			/* Connection closed. */
1298 			shut = 1;
1299 			goto done;
1300 		}
1301 	}
1302 
1303 	if (event & EV_WRITE) {
1304 		n = msgbuf_write(&ibuf->w);
1305 		if (n == -1 && errno != EAGAIN)
1306 			fatal("msgbuf_write");
1307 		if (n == 0) {
1308 			/* Connection closed. */
1309 			shut = 1;
1310 			goto done;
1311 		}
1312 	}
1313 
1314 	proc = client->session;
1315 	if (proc == NULL)
1316 		fatalx("cannot find session child process for fd %d", fd);
1317 
1318 	for (;;) {
1319 		const struct got_error *err = NULL;
1320 		uint32_t client_id = 0;
1321 		int do_disconnect = 0, do_start_repo_child = 0;
1322 
1323 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1324 			fatal("%s: imsg_get error", __func__);
1325 		if (n == 0)	/* No more messages. */
1326 			break;
1327 
1328 		switch (imsg.hdr.type) {
1329 		case GOTD_IMSG_ERROR:
1330 			do_disconnect = 1;
1331 			err = gotd_imsg_recv_error(&client_id, &imsg);
1332 			break;
1333 		case GOTD_IMSG_CLIENT_SESSION_READY:
1334 			if (client->state != GOTD_STATE_EXPECT_LIST_REFS) {
1335 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1336 				break;
1337 			}
1338 			do_start_repo_child = 1;
1339 			break;
1340 		case GOTD_IMSG_DISCONNECT:
1341 			do_disconnect = 1;
1342 			break;
1343 		default:
1344 			log_debug("unexpected imsg %d", imsg.hdr.type);
1345 			break;
1346 		}
1347 
1348 		if (!verify_imsg_src(client, proc, &imsg)) {
1349 			log_debug("dropping imsg type %d from PID %d",
1350 			    imsg.hdr.type, proc->pid);
1351 			imsg_free(&imsg);
1352 			continue;
1353 		}
1354 		if (err)
1355 			log_warnx("uid %d: %s", client->euid, err->msg);
1356 
1357 		if (do_start_repo_child) {
1358 			struct gotd_repo *repo;
1359 
1360 			repo = find_repo_by_name(client->session->repo_name);
1361 			if (repo != NULL) {
1362 				enum gotd_procid proc_type;
1363 
1364 				if (client->required_auth & GOTD_AUTH_WRITE)
1365 					proc_type = PROC_REPO_WRITE;
1366 				else
1367 					proc_type = PROC_REPO_READ;
1368 
1369 				err = start_repo_child(client, proc_type, repo,
1370 				    gotd.argv0, gotd.confpath, gotd.daemonize,
1371 				    gotd.verbosity);
1372 			} else
1373 				err = got_error(GOT_ERR_NOT_GIT_REPO);
1374 
1375 			if (err) {
1376 				log_warnx("uid %d: %s", client->euid, err->msg);
1377 				do_disconnect = 1;
1378 			}
1379 		}
1380 
1381 		if (do_disconnect) {
1382 			if (err)
1383 				disconnect_on_error(client, err);
1384 			else
1385 				disconnect(client);
1386 		}
1387 
1388 		imsg_free(&imsg);
1389 	}
1390 done:
1391 	if (!shut) {
1392 		gotd_imsg_event_add(iev);
1393 	} else {
1394 		/* This pipe is dead. Remove its event handler */
1395 		event_del(&iev->ev);
1396 		disconnect(client);
1397 	}
1398 }
1399 
1400 static void
1401 gotd_dispatch_repo_child(int fd, short event, void *arg)
1402 {
1403 	struct gotd_imsgev *iev = arg;
1404 	struct imsgbuf *ibuf = &iev->ibuf;
1405 	struct gotd_child_proc *proc = NULL;
1406 	struct gotd_client *client;
1407 	ssize_t n;
1408 	int shut = 0;
1409 	struct imsg imsg;
1410 
1411 	client = find_client_by_proc_fd(fd);
1412 	if (client == NULL)
1413 		fatalx("cannot find client for fd %d", fd);
1414 
1415 	if (event & EV_READ) {
1416 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1417 			fatal("imsg_read error");
1418 		if (n == 0) {
1419 			/* Connection closed. */
1420 			shut = 1;
1421 			goto done;
1422 		}
1423 	}
1424 
1425 	if (event & EV_WRITE) {
1426 		n = msgbuf_write(&ibuf->w);
1427 		if (n == -1 && errno != EAGAIN)
1428 			fatal("msgbuf_write");
1429 		if (n == 0) {
1430 			/* Connection closed. */
1431 			shut = 1;
1432 			goto done;
1433 		}
1434 	}
1435 
1436 	proc = get_client_repo_proc(client);
1437 	if (proc == NULL)
1438 		fatalx("cannot find child process for fd %d", fd);
1439 
1440 	for (;;) {
1441 		const struct got_error *err = NULL;
1442 		uint32_t client_id = 0;
1443 		int do_disconnect = 0;
1444 
1445 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1446 			fatal("%s: imsg_get error", __func__);
1447 		if (n == 0)	/* No more messages. */
1448 			break;
1449 
1450 		switch (imsg.hdr.type) {
1451 		case GOTD_IMSG_ERROR:
1452 			do_disconnect = 1;
1453 			err = gotd_imsg_recv_error(&client_id, &imsg);
1454 			break;
1455 		case GOTD_IMSG_REPO_CHILD_READY:
1456 			err = connect_session(client);
1457 			if (err)
1458 				break;
1459 			err = connect_repo_child(client, proc);
1460 			break;
1461 		default:
1462 			log_debug("unexpected imsg %d", imsg.hdr.type);
1463 			break;
1464 		}
1465 
1466 		if (!verify_imsg_src(client, proc, &imsg)) {
1467 			log_debug("dropping imsg type %d from PID %d",
1468 			    imsg.hdr.type, proc->pid);
1469 			imsg_free(&imsg);
1470 			continue;
1471 		}
1472 		if (err)
1473 			log_warnx("uid %d: %s", client->euid, err->msg);
1474 
1475 		if (do_disconnect) {
1476 			if (err)
1477 				disconnect_on_error(client, err);
1478 			else
1479 				disconnect(client);
1480 		}
1481 
1482 		imsg_free(&imsg);
1483 	}
1484 done:
1485 	if (!shut) {
1486 		gotd_imsg_event_add(iev);
1487 	} else {
1488 		/* This pipe is dead. Remove its event handler */
1489 		event_del(&iev->ev);
1490 		disconnect(client);
1491 	}
1492 }
1493 
1494 static pid_t
1495 start_child(enum gotd_procid proc_id, const char *repo_path,
1496     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1497 {
1498 	char	*argv[11];
1499 	int	 argc = 0;
1500 	pid_t	 pid;
1501 
1502 	switch (pid = fork()) {
1503 	case -1:
1504 		fatal("cannot fork");
1505 	case 0:
1506 		break;
1507 	default:
1508 		close(fd);
1509 		return pid;
1510 	}
1511 
1512 	if (fd != GOTD_FILENO_MSG_PIPE) {
1513 		if (dup2(fd, GOTD_FILENO_MSG_PIPE) == -1)
1514 			fatal("cannot setup imsg fd");
1515 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1516 		fatal("cannot setup imsg fd");
1517 
1518 	argv[argc++] = argv0;
1519 	switch (proc_id) {
1520 	case PROC_LISTEN:
1521 		argv[argc++] = (char *)"-L";
1522 		break;
1523 	case PROC_AUTH:
1524 		argv[argc++] = (char *)"-A";
1525 		break;
1526 	case PROC_SESSION:
1527 		argv[argc++] = (char *)"-S";
1528 		break;
1529 	case PROC_REPO_READ:
1530 		argv[argc++] = (char *)"-R";
1531 		break;
1532 	case PROC_REPO_WRITE:
1533 		argv[argc++] = (char *)"-W";
1534 		break;
1535 	default:
1536 		fatalx("invalid process id %d", proc_id);
1537 	}
1538 
1539 	argv[argc++] = (char *)"-f";
1540 	argv[argc++] = (char *)confpath;
1541 
1542 	if (repo_path) {
1543 		argv[argc++] = (char *)"-P";
1544 		argv[argc++] = (char *)repo_path;
1545 	}
1546 
1547 	if (!daemonize)
1548 		argv[argc++] = (char *)"-d";
1549 	if (verbosity > 0)
1550 		argv[argc++] = (char *)"-v";
1551 	if (verbosity > 1)
1552 		argv[argc++] = (char *)"-v";
1553 	argv[argc++] = NULL;
1554 
1555 	execvp(argv0, argv);
1556 	fatal("execvp");
1557 }
1558 
1559 static void
1560 start_listener(char *argv0, const char *confpath, int daemonize, int verbosity)
1561 {
1562 	struct gotd_child_proc *proc = &gotd.listen_proc;
1563 
1564 	proc->type = PROC_LISTEN;
1565 
1566 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1567 	    PF_UNSPEC, proc->pipe) == -1)
1568 		fatal("socketpair");
1569 
1570 	proc->pid = start_child(proc->type, NULL, argv0, confpath,
1571 	    proc->pipe[1], daemonize, verbosity);
1572 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1573 	proc->iev.handler = gotd_dispatch_listener;
1574 	proc->iev.events = EV_READ;
1575 	proc->iev.handler_arg = NULL;
1576 }
1577 
1578 static const struct got_error *
1579 start_session_child(struct gotd_client *client, struct gotd_repo *repo,
1580     char *argv0, const char *confpath, int daemonize, int verbosity)
1581 {
1582 	struct gotd_child_proc *proc;
1583 
1584 	proc = calloc(1, sizeof(*proc));
1585 	if (proc == NULL)
1586 		return got_error_from_errno("calloc");
1587 
1588 	proc->type = PROC_SESSION;
1589 	if (strlcpy(proc->repo_name, repo->name,
1590 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1591 		fatalx("repository name too long: %s", repo->name);
1592 	log_debug("starting client uid %d session for repository %s",
1593 	    client->euid, repo->name);
1594 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1595 	    sizeof(proc->repo_path))
1596 		fatalx("repository path too long: %s", repo->path);
1597 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1598 	    PF_UNSPEC, proc->pipe) == -1)
1599 		fatal("socketpair");
1600 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1601 	    confpath, proc->pipe[1], daemonize, verbosity);
1602 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1603 	log_debug("proc %s %s is on fd %d",
1604 	    gotd_proc_names[proc->type], proc->repo_path,
1605 	    proc->pipe[0]);
1606 	proc->iev.handler = gotd_dispatch_client_session;
1607 	proc->iev.events = EV_READ;
1608 	proc->iev.handler_arg = NULL;
1609 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1610 	    gotd_dispatch_client_session, &proc->iev);
1611 	gotd_imsg_event_add(&proc->iev);
1612 
1613 	client->session = proc;
1614 	return NULL;
1615 }
1616 
1617 static const struct got_error *
1618 start_repo_child(struct gotd_client *client, enum gotd_procid proc_type,
1619     struct gotd_repo *repo, char *argv0, const char *confpath,
1620     int daemonize, int verbosity)
1621 {
1622 	struct gotd_child_proc *proc;
1623 
1624 	if (proc_type != PROC_REPO_READ && proc_type != PROC_REPO_WRITE)
1625 		return got_error_msg(GOT_ERR_NOT_IMPL, "bad process type");
1626 
1627 	proc = calloc(1, sizeof(*proc));
1628 	if (proc == NULL)
1629 		return got_error_from_errno("calloc");
1630 
1631 	proc->type = proc_type;
1632 	if (strlcpy(proc->repo_name, repo->name,
1633 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1634 		fatalx("repository name too long: %s", repo->name);
1635 	log_debug("starting %s for repository %s",
1636 	    proc->type == PROC_REPO_READ ? "reader" : "writer", repo->name);
1637 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1638 	    sizeof(proc->repo_path))
1639 		fatalx("repository path too long: %s", repo->path);
1640 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1641 	    PF_UNSPEC, proc->pipe) == -1)
1642 		fatal("socketpair");
1643 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1644 	    confpath, proc->pipe[1], daemonize, verbosity);
1645 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1646 	log_debug("proc %s %s is on fd %d",
1647 	    gotd_proc_names[proc->type], proc->repo_path,
1648 	    proc->pipe[0]);
1649 	proc->iev.handler = gotd_dispatch_repo_child;
1650 	proc->iev.events = EV_READ;
1651 	proc->iev.handler_arg = NULL;
1652 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1653 	    gotd_dispatch_repo_child, &proc->iev);
1654 	gotd_imsg_event_add(&proc->iev);
1655 
1656 	if (proc->type == PROC_REPO_READ)
1657 		client->repo_read = proc;
1658 	else
1659 		client->repo_write = proc;
1660 
1661 	return NULL;
1662 }
1663 
1664 static const struct got_error *
1665 start_auth_child(struct gotd_client *client, int required_auth,
1666     struct gotd_repo *repo, char *argv0, const char *confpath,
1667     int daemonize, int verbosity)
1668 {
1669 	const struct got_error *err = NULL;
1670 	struct gotd_child_proc *proc;
1671 	struct gotd_imsg_auth iauth;
1672 	int fd;
1673 
1674 	memset(&iauth, 0, sizeof(iauth));
1675 
1676 	fd = dup(client->fd);
1677 	if (fd == -1)
1678 		return got_error_from_errno("dup");
1679 
1680 	proc = calloc(1, sizeof(*proc));
1681 	if (proc == NULL) {
1682 		err = got_error_from_errno("calloc");
1683 		close(fd);
1684 		return err;
1685 	}
1686 
1687 	proc->type = PROC_AUTH;
1688 	if (strlcpy(proc->repo_name, repo->name,
1689 	    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
1690 		fatalx("repository name too long: %s", repo->name);
1691 	log_debug("starting auth for uid %d repository %s",
1692 	    client->euid, repo->name);
1693 	if (strlcpy(proc->repo_path, repo->path, sizeof(proc->repo_path)) >=
1694 	    sizeof(proc->repo_path))
1695 		fatalx("repository path too long: %s", repo->path);
1696 	if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
1697 	    PF_UNSPEC, proc->pipe) == -1)
1698 		fatal("socketpair");
1699 	proc->pid = start_child(proc->type, proc->repo_path, argv0,
1700 	    confpath, proc->pipe[1], daemonize, verbosity);
1701 	imsg_init(&proc->iev.ibuf, proc->pipe[0]);
1702 	log_debug("proc %s %s is on fd %d",
1703 	    gotd_proc_names[proc->type], proc->repo_path,
1704 	    proc->pipe[0]);
1705 	proc->iev.handler = gotd_dispatch_auth_child;
1706 	proc->iev.events = EV_READ;
1707 	proc->iev.handler_arg = NULL;
1708 	event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
1709 	    gotd_dispatch_auth_child, &proc->iev);
1710 	gotd_imsg_event_add(&proc->iev);
1711 
1712 	iauth.euid = client->euid;
1713 	iauth.egid = client->egid;
1714 	iauth.required_auth = required_auth;
1715 	iauth.client_id = client->id;
1716 	if (gotd_imsg_compose_event(&proc->iev, GOTD_IMSG_AUTHENTICATE,
1717 	    PROC_GOTD, fd, &iauth, sizeof(iauth)) == -1) {
1718 		log_warn("imsg compose AUTHENTICATE");
1719 		close(fd);
1720 		/* Let the auth_timeout handler tidy up. */
1721 	}
1722 
1723 	client->auth = proc;
1724 	client->required_auth = required_auth;
1725 	return NULL;
1726 }
1727 
1728 static void
1729 apply_unveil_repo_readonly(const char *repo_path)
1730 {
1731 	if (unveil(repo_path, "r") == -1)
1732 		fatal("unveil %s", repo_path);
1733 
1734 	if (unveil(NULL, NULL) == -1)
1735 		fatal("unveil");
1736 }
1737 
1738 static void
1739 apply_unveil_repo_readwrite(const char *repo_path)
1740 {
1741 	if (unveil(repo_path, "rwc") == -1)
1742 		fatal("unveil %s", repo_path);
1743 
1744 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
1745 		fatal("unveil %s", GOT_TMPDIR_STR);
1746 
1747 	if (unveil(NULL, NULL) == -1)
1748 		fatal("unveil");
1749 }
1750 
1751 static void
1752 apply_unveil_none(void)
1753 {
1754 	if (unveil("/", "") == -1)
1755 		fatal("unveil");
1756 
1757 	if (unveil(NULL, NULL) == -1)
1758 		fatal("unveil");
1759 }
1760 
1761 static void
1762 apply_unveil_selfexec(void)
1763 {
1764 	if (unveil(gotd.argv0, "x") == -1)
1765 		fatal("unveil %s", gotd.argv0);
1766 
1767 	if (unveil(NULL, NULL) == -1)
1768 		fatal("unveil");
1769 }
1770 
1771 int
1772 main(int argc, char **argv)
1773 {
1774 	const struct got_error *error = NULL;
1775 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
1776 	const char *confpath = GOTD_CONF_PATH;
1777 	char *argv0 = argv[0];
1778 	char title[2048];
1779 	struct passwd *pw = NULL;
1780 	char *repo_path = NULL;
1781 	enum gotd_procid proc_id = PROC_GOTD;
1782 	struct event evsigint, evsigterm, evsighup, evsigusr1;
1783 	int *pack_fds = NULL, *temp_fds = NULL;
1784 
1785 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
1786 
1787 	while ((ch = getopt(argc, argv, "Adf:LnP:RSvW")) != -1) {
1788 		switch (ch) {
1789 		case 'A':
1790 			proc_id = PROC_AUTH;
1791 			break;
1792 		case 'd':
1793 			daemonize = 0;
1794 			break;
1795 		case 'f':
1796 			confpath = optarg;
1797 			break;
1798 		case 'L':
1799 			proc_id = PROC_LISTEN;
1800 			break;
1801 		case 'n':
1802 			noaction = 1;
1803 			break;
1804 		case 'P':
1805 			repo_path = realpath(optarg, NULL);
1806 			if (repo_path == NULL)
1807 				fatal("realpath '%s'", optarg);
1808 			break;
1809 		case 'R':
1810 			proc_id = PROC_REPO_READ;
1811 			break;
1812 		case 'S':
1813 			proc_id = PROC_SESSION;
1814 			break;
1815 		case 'v':
1816 			if (verbosity < 3)
1817 				verbosity++;
1818 			break;
1819 		case 'W':
1820 			proc_id = PROC_REPO_WRITE;
1821 			break;
1822 		default:
1823 			usage();
1824 		}
1825 	}
1826 
1827 	argc -= optind;
1828 	argv += optind;
1829 
1830 	if (argc != 0)
1831 		usage();
1832 
1833 	/* Require an absolute path in argv[0] for reliable re-exec. */
1834 	if (!got_path_is_absolute(argv0))
1835 		fatalx("bad path \"%s\": must be an absolute path", argv0);
1836 
1837 	if (geteuid() && (proc_id == PROC_GOTD || proc_id == PROC_LISTEN))
1838 		fatalx("need root privileges");
1839 
1840 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
1841 	log_setverbose(verbosity);
1842 
1843 	if (parse_config(confpath, proc_id, &gotd) != 0)
1844 		return 1;
1845 
1846 	gotd.argv0 = argv0;
1847 	gotd.daemonize = daemonize;
1848 	gotd.verbosity = verbosity;
1849 	gotd.confpath = confpath;
1850 
1851 	if (proc_id == PROC_GOTD &&
1852 	    (gotd.nrepos == 0 || TAILQ_EMPTY(&gotd.repos)))
1853 		fatalx("no repository defined in configuration file");
1854 
1855 	pw = getpwnam(gotd.user_name);
1856 	if (pw == NULL)
1857 		fatalx("user %s not found", gotd.user_name);
1858 
1859 	if (pw->pw_uid == 0) {
1860 		fatalx("cannot run %s as %s: the user running %s "
1861 		    "must not be the superuser",
1862 		    getprogname(), pw->pw_name, getprogname());
1863 	}
1864 
1865 	if (proc_id == PROC_LISTEN &&
1866 	    !got_path_is_absolute(gotd.unix_socket_path))
1867 		fatalx("bad unix socket path \"%s\": must be an absolute path",
1868 		    gotd.unix_socket_path);
1869 
1870 	if (noaction)
1871 		return 0;
1872 
1873 	if (proc_id == PROC_GOTD) {
1874 		gotd.pid = getpid();
1875 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1876 		start_listener(argv0, confpath, daemonize, verbosity);
1877 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
1878 		if (daemonize && daemon(1, 0) == -1)
1879 			fatal("daemon");
1880 	} else if (proc_id == PROC_LISTEN) {
1881 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
1882 		if (verbosity) {
1883 			log_info("socket: %s", gotd.unix_socket_path);
1884 			log_info("user: %s", pw->pw_name);
1885 		}
1886 
1887 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
1888 		    pw->pw_gid);
1889 		if (fd == -1) {
1890 			fatal("cannot listen on unix socket %s",
1891 			    gotd.unix_socket_path);
1892 		}
1893 		if (daemonize && daemon(0, 0) == -1)
1894 			fatal("daemon");
1895 	} else if (proc_id == PROC_AUTH) {
1896 		snprintf(title, sizeof(title), "%s %s",
1897 		    gotd_proc_names[proc_id], repo_path);
1898 		if (daemonize && daemon(0, 0) == -1)
1899 			fatal("daemon");
1900 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE ||
1901 	    proc_id == PROC_SESSION) {
1902 		error = got_repo_pack_fds_open(&pack_fds);
1903 		if (error != NULL)
1904 			fatalx("cannot open pack tempfiles: %s", error->msg);
1905 		error = got_repo_temp_fds_open(&temp_fds);
1906 		if (error != NULL)
1907 			fatalx("cannot open pack tempfiles: %s", error->msg);
1908 		if (repo_path == NULL)
1909 			fatalx("repository path not specified");
1910 		snprintf(title, sizeof(title), "%s %s",
1911 		    gotd_proc_names[proc_id], repo_path);
1912 		if (daemonize && daemon(0, 0) == -1)
1913 			fatal("daemon");
1914 	} else
1915 		fatal("invalid process id %d", proc_id);
1916 
1917 	setproctitle("%s", title);
1918 	log_procinit(title);
1919 
1920 	/* Drop root privileges. */
1921 	if (setgid(pw->pw_gid) == -1)
1922 		fatal("setgid %d failed", pw->pw_gid);
1923 	if (setuid(pw->pw_uid) == -1)
1924 		fatal("setuid %d failed", pw->pw_uid);
1925 
1926 	event_init();
1927 
1928 	switch (proc_id) {
1929 	case PROC_GOTD:
1930 #ifndef PROFILE
1931 		/* "exec" promise will be limited to argv[0] via unveil(2). */
1932 		if (pledge("stdio proc exec sendfd recvfd unveil", NULL) == -1)
1933 			err(1, "pledge");
1934 #endif
1935 		break;
1936 	case PROC_LISTEN:
1937 #ifndef PROFILE
1938 		if (pledge("stdio sendfd unix unveil", NULL) == -1)
1939 			err(1, "pledge");
1940 #endif
1941 		/*
1942 		 * Ensure that AF_UNIX bind(2) cannot be used with any other
1943 		 * sockets by revoking all filesystem access via unveil(2).
1944 		 */
1945 		apply_unveil_none();
1946 
1947 		listen_main(title, fd, gotd.connection_limits,
1948 		    gotd.nconnection_limits);
1949 		/* NOTREACHED */
1950 		break;
1951 	case PROC_AUTH:
1952 #ifndef PROFILE
1953 		if (pledge("stdio getpw recvfd unix unveil", NULL) == -1)
1954 			err(1, "pledge");
1955 #endif
1956 		/*
1957 		 * We need the "unix" pledge promise for getpeername(2) only.
1958 		 * Ensure that AF_UNIX bind(2) cannot be used by revoking all
1959 		 * filesystem access via unveil(2). Access to password database
1960 		 * files will still work since "getpw" bypasses unveil(2).
1961 		 */
1962 		apply_unveil_none();
1963 
1964 		auth_main(title, &gotd.repos, repo_path);
1965 		/* NOTREACHED */
1966 		break;
1967 	case PROC_SESSION:
1968 #ifndef PROFILE
1969 		/*
1970 		 * The "recvfd" promise is only needed during setup and
1971 		 * will be removed in a later pledge(2) call.
1972 		 */
1973 		if (pledge("stdio rpath wpath cpath recvfd sendfd fattr flock "
1974 		    "unveil", NULL) == -1)
1975 			err(1, "pledge");
1976 #endif
1977 		apply_unveil_repo_readwrite(repo_path);
1978 		session_main(title, repo_path, pack_fds, temp_fds,
1979 		    &gotd.request_timeout);
1980 		/* NOTREACHED */
1981 		break;
1982 	case PROC_REPO_READ:
1983 #ifndef PROFILE
1984 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1985 			err(1, "pledge");
1986 #endif
1987 		apply_unveil_repo_readonly(repo_path);
1988 		repo_read_main(title, repo_path, pack_fds, temp_fds);
1989 		/* NOTREACHED */
1990 		exit(0);
1991 	case PROC_REPO_WRITE:
1992 #ifndef PROFILE
1993 		if (pledge("stdio rpath recvfd unveil", NULL) == -1)
1994 			err(1, "pledge");
1995 #endif
1996 		apply_unveil_repo_readonly(repo_path);
1997 		repo_write_main(title, repo_path, pack_fds, temp_fds);
1998 		/* NOTREACHED */
1999 		exit(0);
2000 	default:
2001 		fatal("invalid process id %d", proc_id);
2002 	}
2003 
2004 	if (proc_id != PROC_GOTD)
2005 		fatal("invalid process id %d", proc_id);
2006 
2007 	apply_unveil_selfexec();
2008 
2009 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2010 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2011 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2012 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2013 	signal(SIGPIPE, SIG_IGN);
2014 
2015 	signal_add(&evsigint, NULL);
2016 	signal_add(&evsigterm, NULL);
2017 	signal_add(&evsighup, NULL);
2018 	signal_add(&evsigusr1, NULL);
2019 
2020 	gotd_imsg_event_add(&gotd.listen_proc.iev);
2021 
2022 	event_dispatch();
2023 
2024 	free(repo_path);
2025 	gotd_shutdown();
2026 
2027 	return 0;
2028 }