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Date:: Tue Nov 1 08:33:49 2022 UTC
Message:: use mkstemps(3) instead of mkstemp(3) for opening named temporary files Allows 'got commit' to use a ".diff" suffix for temporary diff files. 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 <stdlib.h>
41 #include <string.h>
42 #include <syslog.h>
43 #include <unistd.h>
44 
45 #include "got_error.h"
46 #include "got_opentemp.h"
47 #include "got_path.h"
48 #include "got_repository.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 
52 #include "got_lib_delta.h"
53 #include "got_lib_object.h"
54 #include "got_lib_object_cache.h"
55 #include "got_lib_sha1.h"
56 #include "got_lib_gitproto.h"
57 #include "got_lib_pack.h"
58 #include "got_lib_repository.h"
59 
60 #include "gotd.h"
61 #include "log.h"
62 #include "repo_read.h"
63 #include "repo_write.h"
64 
65 #ifndef nitems
66 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
67 #endif
68 
69 struct gotd_client {
70 	STAILQ_ENTRY(gotd_client)	 entry;
71 	enum gotd_client_state		 state;
72 	struct gotd_client_capability	*capabilities;
73 	size_t				 ncapa_alloc;
74 	size_t				 ncapabilities;
75 	uint32_t			 id;
76 	int				 fd;
77 	int				 delta_cache_fd;
78 	struct gotd_imsgev		 iev;
79 	struct event			 tmo;
80 	uid_t				 euid;
81 	gid_t				 egid;
82 	struct gotd_child_proc		*repo_read;
83 	struct gotd_child_proc		*repo_write;
84 	char				*packfile_path;
85 	char				*packidx_path;
86 	int				 nref_updates;
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 timeout = { 3600, 0 };
94 static int inflight;
95 static struct gotd gotd;
96 
97 void gotd_sighdlr(int sig, short event, void *arg);
98 static void gotd_shutdown(void);
99 
100 __dead static void
101 usage()
102 {
103 	fprintf(stderr, "usage: %s [-dv] [-f config-file]\n", getprogname());
104 	exit(1);
105 }
106 
107 static int
108 unix_socket_listen(const char *unix_socket_path, uid_t uid, gid_t gid)
109 {
110 	struct sockaddr_un sun;
111 	int fd = -1;
112 	mode_t old_umask, mode;
113 
114 	fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK| SOCK_CLOEXEC, 0);
115 	if (fd == -1) {
116 		log_warn("socket");
117 		return -1;
118 	}
119 
120 	sun.sun_family = AF_UNIX;
121 	if (strlcpy(sun.sun_path, unix_socket_path,
122 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
123 		log_warnx("%s: name too long", unix_socket_path);
124 		close(fd);
125 		return -1;
126 	}
127 
128 	if (unlink(unix_socket_path) == -1) {
129 		if (errno != ENOENT) {
130 			log_warn("unlink %s", unix_socket_path);
131 			close(fd);
132 			return -1;
133 		}
134 	}
135 
136 	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
137 	mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
138 
139 	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
140 		log_warn("bind: %s", unix_socket_path);
141 		close(fd);
142 		umask(old_umask);
143 		return -1;
144 	}
145 
146 	umask(old_umask);
147 
148 	if (chmod(unix_socket_path, mode) == -1) {
149 		log_warn("chmod %o %s", mode, unix_socket_path);
150 		close(fd);
151 		unlink(unix_socket_path);
152 		return -1;
153 	}
154 
155 	if (chown(unix_socket_path, uid, gid) == -1) {
156 		log_warn("chown %s uid=%d gid=%d", unix_socket_path, uid, gid);
157 		close(fd);
158 		unlink(unix_socket_path);
159 		return -1;
160 	}
161 
162 	if (listen(fd, GOTD_UNIX_SOCKET_BACKLOG) == -1) {
163 		log_warn("listen");
164 		close(fd);
165 		unlink(unix_socket_path);
166 		return -1;
167 	}
168 
169 	return fd;
170 }
171 
172 static struct group *
173 match_group(gid_t *groups, int ngroups, const char *unix_group_name)
174 {
175 	struct group *gr;
176 	int i;
177 
178 	for (i = 0; i < ngroups; i++) {
179 		gr = getgrgid(groups[i]);
180 		if (gr == NULL) {
181 			log_warn("getgrgid %d", groups[i]);
182 			continue;
183 		}
184 		if (strcmp(gr->gr_name, unix_group_name) == 0)
185 			return gr;
186 	}
187 
188 	return NULL;
189 }
190 
191 static int
192 accept_reserve(int fd, struct sockaddr *addr, socklen_t *addrlen,
193     int reserve, volatile int *counter)
194 {
195 	int ret;
196 
197 	if (getdtablecount() + reserve +
198 	    ((*counter + 1) * GOTD_FD_NEEDED) >= getdtablesize()) {
199 		log_debug("inflight fds exceeded");
200 		errno = EMFILE;
201 		return -1;
202 	}
203 
204 	if ((ret = accept4(fd, addr, addrlen,
205 	    SOCK_NONBLOCK | SOCK_CLOEXEC)) > -1) {
206 		(*counter)++;
207 	}
208 
209 	return ret;
210 }
211 
212 static uint64_t
213 client_hash(uint32_t client_id)
214 {
215 	return SipHash24(&clients_hash_key, &client_id, sizeof(client_id));
216 }
217 
218 static void
219 add_client(struct gotd_client *client)
220 {
221 	uint64_t slot = client_hash(client->id) % nitems(gotd_clients);
222 	STAILQ_INSERT_HEAD(&gotd_clients[slot], client, entry);
223 	client_cnt++;
224 }
225 
226 static struct gotd_client *
227 find_client(uint32_t client_id)
228 {
229 	uint64_t slot;
230 	struct gotd_client *c;
231 
232 	slot = client_hash(client_id) % nitems(gotd_clients);
233 	STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
234 		if (c->id == client_id)
235 			return c;
236 	}
237 
238 	return NULL;
239 }
240 
241 static uint32_t
242 get_client_id(void)
243 {
244 	int duplicate = 0;
245 	uint32_t id;
246 
247 	do {
248 		id = arc4random();
249 		duplicate = (find_client(id) != NULL);
250 	} while (duplicate || id == 0);
251 
252 	return id;
253 }
254 
255 static struct gotd_child_proc *
256 get_client_proc(struct gotd_client *client)
257 {
258 	if (client->repo_read && client->repo_write) {
259 		fatalx("uid %d is reading and writing in the same session",
260 		    client->euid);
261 		/* NOTREACHED */
262 	}
263 
264 	if (client->repo_read)
265 		return client->repo_read;
266 	else if (client->repo_write)
267 		return client->repo_write;
268 
269 	return NULL;
270 }
271 
272 static int
273 client_is_reading(struct gotd_client *client)
274 {
275 	return client->repo_read != NULL;
276 }
277 
278 static int
279 client_is_writing(struct gotd_client *client)
280 {
281 	return client->repo_write != NULL;
282 }
283 
284 static const struct got_error *
285 ensure_client_is_reading(struct gotd_client *client)
286 {
287 	if (!client_is_reading(client)) {
288 		return got_error_fmt(GOT_ERR_BAD_PACKET,
289 		    "uid %d made a read-request but is not reading from "
290 		    "a repository", client->euid);
291 	}
292 
293 	return NULL;
294 }
295 
296 static const struct got_error *
297 ensure_client_is_writing(struct gotd_client *client)
298 {
299 	if (!client_is_writing(client)) {
300 		return got_error_fmt(GOT_ERR_BAD_PACKET,
301 		    "uid %d made a write-request but is not writing to "
302 		    "a repository", client->euid);
303 	}
304 
305 	return NULL;
306 }
307 
308 static const struct got_error *
309 ensure_client_is_not_writing(struct gotd_client *client)
310 {
311 	if (client_is_writing(client)) {
312 		return got_error_fmt(GOT_ERR_BAD_PACKET,
313 		    "uid %d made a read-request but is writing to "
314 		    "a repository", client->euid);
315 	}
316 
317 	return NULL;
318 }
319 
320 static const struct got_error *
321 ensure_client_is_not_reading(struct gotd_client *client)
322 {
323 	if (client_is_reading(client)) {
324 		return got_error_fmt(GOT_ERR_BAD_PACKET,
325 		    "uid %d made a write-request but is reading from "
326 		    "a repository", client->euid);
327 	}
328 
329 	return NULL;
330 }
331 
332 static void
333 disconnect(struct gotd_client *client)
334 {
335 	struct gotd_imsg_disconnect idisconnect;
336 	struct gotd_child_proc *proc = get_client_proc(client);
337 	uint64_t slot;
338 
339 	log_debug("uid %d: disconnecting", client->euid);
340 
341 	idisconnect.client_id = client->id;
342 	if (proc) {
343 		if (gotd_imsg_compose_event(&proc->iev,
344 		    GOTD_IMSG_DISCONNECT, PROC_GOTD, -1,
345 		    &idisconnect, sizeof(idisconnect)) == -1)
346 			log_warn("imsg compose DISCONNECT");
347 	}
348 	slot = client_hash(client->id) % nitems(gotd_clients);
349 	STAILQ_REMOVE(&gotd_clients[slot], client, gotd_client, entry);
350 	imsg_clear(&client->iev.ibuf);
351 	event_del(&client->iev.ev);
352 	evtimer_del(&client->tmo);
353 	close(client->fd);
354 	if (client->delta_cache_fd != -1)
355 		close(client->delta_cache_fd);
356 	if (client->packfile_path) {
357 		if (unlink(client->packfile_path) == -1 && errno != ENOENT)
358 			log_warn("unlink %s: ", client->packfile_path);
359 		free(client->packfile_path);
360 	}
361 	if (client->packidx_path) {
362 		if (unlink(client->packidx_path) == -1 && errno != ENOENT)
363 			log_warn("unlink %s: ", client->packidx_path);
364 		free(client->packidx_path);
365 	}
366 	free(client->capabilities);
367 	free(client);
368 	inflight--;
369 	client_cnt--;
370 }
371 
372 static void
373 disconnect_on_error(struct gotd_client *client, const struct got_error *err)
374 {
375 	struct imsgbuf ibuf;
376 
377 	log_warnx("uid %d: %s", client->euid, err->msg);
378 	if (err->code != GOT_ERR_EOF) {
379 		imsg_init(&ibuf, client->fd);
380 		gotd_imsg_send_error(&ibuf, 0, PROC_GOTD, err);
381 		imsg_clear(&ibuf);
382 	}
383 	disconnect(client);
384 }
385 
386 static const struct got_error *
387 send_repo_info(struct gotd_imsgev *iev, struct gotd_repo *repo)
388 {
389 	const struct got_error *err = NULL;
390 	struct gotd_imsg_info_repo irepo;
391 
392 	memset(&irepo, 0, sizeof(irepo));
393 
394 	if (strlcpy(irepo.repo_name, repo->name, sizeof(irepo.repo_name))
395 	    >= sizeof(irepo.repo_name))
396 		return got_error_msg(GOT_ERR_NO_SPACE, "repo name too long");
397 	if (strlcpy(irepo.repo_path, repo->path, sizeof(irepo.repo_path))
398 	    >= sizeof(irepo.repo_path))
399 		return got_error_msg(GOT_ERR_NO_SPACE, "repo path too long");
400 
401 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_REPO, PROC_GOTD, -1,
402 	    &irepo, sizeof(irepo)) == -1) {
403 		err = got_error_from_errno("imsg compose INFO_REPO");
404 		if (err)
405 			return err;
406 	}
407 
408 	return NULL;
409 }
410 
411 static const struct got_error *
412 send_capability(struct gotd_client_capability *capa, struct gotd_imsgev* iev)
413 {
414 	const struct got_error *err = NULL;
415 	struct gotd_imsg_capability icapa;
416 	size_t len;
417 	struct ibuf *wbuf;
418 
419 	memset(&icapa, 0, sizeof(icapa));
420 
421 	icapa.key_len = strlen(capa->key);
422 	len = sizeof(icapa) + icapa.key_len;
423 	if (capa->value) {
424 		icapa.value_len = strlen(capa->value);
425 		len += icapa.value_len;
426 	}
427 
428 	wbuf = imsg_create(&iev->ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
429 	if (wbuf == NULL) {
430 		err = got_error_from_errno("imsg_create CAPABILITY");
431 		return err;
432 	}
433 
434 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
435 		return got_error_from_errno("imsg_add CAPABILITY");
436 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
437 		return got_error_from_errno("imsg_add CAPABILITY");
438 	if (capa->value) {
439 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
440 			return got_error_from_errno("imsg_add CAPABILITY");
441 	}
442 
443 	wbuf->fd = -1;
444 	imsg_close(&iev->ibuf, wbuf);
445 
446 	gotd_imsg_event_add(iev);
447 
448 	return NULL;
449 }
450 
451 static const struct got_error *
452 send_client_info(struct gotd_imsgev *iev, struct gotd_client *client)
453 {
454 	const struct got_error *err = NULL;
455 	struct gotd_imsg_info_client iclient;
456 	struct gotd_child_proc *proc;
457 	size_t i;
458 
459 	memset(&iclient, 0, sizeof(iclient));
460 	iclient.euid = client->euid;
461 	iclient.egid = client->egid;
462 
463 	proc = get_client_proc(client);
464 	if (proc) {
465 		if (strlcpy(iclient.repo_name, proc->chroot_path,
466 		    sizeof(iclient.repo_name)) >= sizeof(iclient.repo_name)) {
467 			return got_error_msg(GOT_ERR_NO_SPACE,
468 			    "repo name too long");
469 		}
470 		if (client_is_writing(client))
471 			iclient.is_writing = 1;
472 	}
473 
474 	iclient.state = client->state;
475 	iclient.ncapabilities = client->ncapabilities;
476 
477 	if (gotd_imsg_compose_event(iev, GOTD_IMSG_INFO_CLIENT, PROC_GOTD, -1,
478 	    &iclient, sizeof(iclient)) == -1) {
479 		err = got_error_from_errno("imsg compose INFO_CLIENT");
480 		if (err)
481 			return err;
482 	}
483 
484 	for (i = 0; i < client->ncapabilities; i++) {
485 		struct gotd_client_capability *capa;
486 		capa = &client->capabilities[i];
487 		err = send_capability(capa, iev);
488 		if (err)
489 			return err;
490 	}
491 
492 	return NULL;
493 }
494 
495 static const struct got_error *
496 send_info(struct gotd_client *client)
497 {
498 	const struct got_error *err = NULL;
499 	struct gotd_imsg_info info;
500 	uint64_t slot;
501 	struct gotd_repo *repo;
502 
503 	info.pid = gotd.pid;
504 	info.verbosity = gotd.verbosity;
505 	info.nrepos = gotd.nrepos;
506 	info.nclients = client_cnt - 1;
507 
508 	if (gotd_imsg_compose_event(&client->iev, GOTD_IMSG_INFO, PROC_GOTD, -1,
509 	    &info, sizeof(info)) == -1) {
510 		err = got_error_from_errno("imsg compose INFO");
511 		if (err)
512 			return err;
513 	}
514 
515 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
516 		err = send_repo_info(&client->iev, repo);
517 		if (err)
518 			return err;
519 	}
520 
521 	for (slot = 0; slot < nitems(gotd_clients); slot++) {
522 		struct gotd_client *c;
523 		STAILQ_FOREACH(c, &gotd_clients[slot], entry) {
524 			if (c->id == client->id)
525 				continue;
526 			err = send_client_info(&client->iev, c);
527 			if (err)
528 				return err;
529 		}
530 	}
531 
532 	return NULL;
533 }
534 
535 static const struct got_error *
536 stop_gotd(struct gotd_client *client)
537 {
538 
539 	if (client->euid != 0)
540 		return got_error_set_errno(EPERM, "stop");
541 
542 	gotd_shutdown();
543 	/* NOTREACHED */
544 	return NULL;
545 }
546 
547 static struct gotd_child_proc *
548 find_proc_by_repo_name(enum gotd_procid proc_id, const char *repo_name)
549 {
550 	struct gotd_child_proc *proc;
551 	int i;
552 	size_t namelen;
553 
554 	for (i = 0; i < gotd.nprocs; i++) {
555 		proc = &gotd.procs[i];
556 		if (proc->type != proc_id)
557 			continue;
558 		namelen = strlen(proc->repo_name);
559 		if (strncmp(proc->repo_name, repo_name, namelen) != 0)
560 			continue;
561 		if (repo_name[namelen] == '\0' ||
562 		    strcmp(&repo_name[namelen], ".git") == 0)
563 			return proc;
564 	}
565 
566 	return NULL;
567 }
568 
569 static struct gotd_child_proc *
570 find_proc_by_fd(int fd)
571 {
572 	struct gotd_child_proc *proc;
573 	int i;
574 
575 	for (i = 0; i < gotd.nprocs; i++) {
576 		proc = &gotd.procs[i];
577 		if (proc->iev.ibuf.fd == fd)
578 			return proc;
579 	}
580 
581 	return NULL;
582 }
583 
584 static const struct got_error *
585 forward_list_refs_request(struct gotd_client *client, struct imsg *imsg)
586 {
587 	const struct got_error *err;
588 	struct gotd_imsg_list_refs ireq;
589 	struct gotd_imsg_list_refs_internal ilref;
590 	struct gotd_child_proc *proc = NULL;
591 	size_t datalen;
592 	int fd = -1;
593 
594 	log_debug("list-refs request from uid %d", client->euid);
595 
596 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
597 	if (datalen != sizeof(ireq))
598 		return got_error(GOT_ERR_PRIVSEP_LEN);
599 
600 	memcpy(&ireq, imsg->data, datalen);
601 
602 	memset(&ilref, 0, sizeof(ilref));
603 	ilref.client_id = client->id;
604 
605 	if (ireq.client_is_reading) {
606 		err = ensure_client_is_not_writing(client);
607 		if (err)
608 			return err;
609 		client->repo_read = find_proc_by_repo_name(PROC_REPO_READ,
610 		    ireq.repo_name);
611 		if (client->repo_read == NULL)
612 			return got_error(GOT_ERR_NOT_GIT_REPO);
613 	} else {
614 		err = ensure_client_is_not_reading(client);
615 		if (err)
616 			return err;
617 		client->repo_write = find_proc_by_repo_name(PROC_REPO_WRITE,
618 		    ireq.repo_name);
619 		if (client->repo_write == NULL)
620 			return got_error(GOT_ERR_NOT_GIT_REPO);
621 	}
622 
623 	fd = dup(client->fd);
624 	if (fd == -1)
625 		return got_error_from_errno("dup");
626 
627 	proc = get_client_proc(client);
628 	if (proc == NULL)
629 		fatalx("no process found for uid %d", client->euid);
630 	if (gotd_imsg_compose_event(&proc->iev,
631 	    GOTD_IMSG_LIST_REFS_INTERNAL, PROC_GOTD, fd,
632 	    &ilref, sizeof(ilref)) == -1) {
633 		err = got_error_from_errno("imsg compose WANT");
634 		close(fd);
635 		return err;
636 	}
637 
638 	return NULL;
639 }
640 
641 static const struct got_error *
642 forward_want(struct gotd_client *client, struct imsg *imsg)
643 {
644 	struct gotd_imsg_want ireq;
645 	struct gotd_imsg_want iwant;
646 	size_t datalen;
647 
648 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
649 	if (datalen != sizeof(ireq))
650 		return got_error(GOT_ERR_PRIVSEP_LEN);
651 
652 	memcpy(&ireq, imsg->data, datalen);
653 
654 	memset(&iwant, 0, sizeof(iwant));
655 	memcpy(iwant.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
656 	iwant.client_id = client->id;
657 
658 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_WANT,
659 	    PROC_GOTD, -1, &iwant, sizeof(iwant)) == -1)
660 		return got_error_from_errno("imsg compose WANT");
661 
662 	return NULL;
663 }
664 
665 static const struct got_error *
666 forward_ref_update(struct gotd_client *client, struct imsg *imsg)
667 {
668 	const struct got_error *err = NULL;
669 	struct gotd_imsg_ref_update ireq;
670 	struct gotd_imsg_ref_update *iref = NULL;
671 	size_t datalen;
672 
673 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
674 	if (datalen < sizeof(ireq))
675 		return got_error(GOT_ERR_PRIVSEP_LEN);
676 	memcpy(&ireq, imsg->data, sizeof(ireq));
677 	if (datalen != sizeof(ireq) + ireq.name_len)
678 		return got_error(GOT_ERR_PRIVSEP_LEN);
679 
680 	iref = malloc(datalen);
681 	if (iref == NULL)
682 		return got_error_from_errno("malloc");
683 	memcpy(iref, imsg->data, datalen);
684 
685 	iref->client_id = client->id;
686 	if (gotd_imsg_compose_event(&client->repo_write->iev,
687 	    GOTD_IMSG_REF_UPDATE, PROC_GOTD, -1, iref, datalen) == -1)
688 		err = got_error_from_errno("imsg compose REF_UPDATE");
689 	free(iref);
690 	return err;
691 }
692 
693 static const struct got_error *
694 forward_have(struct gotd_client *client, struct imsg *imsg)
695 {
696 	struct gotd_imsg_have ireq;
697 	struct gotd_imsg_have ihave;
698 	size_t datalen;
699 
700 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
701 	if (datalen != sizeof(ireq))
702 		return got_error(GOT_ERR_PRIVSEP_LEN);
703 
704 	memcpy(&ireq, imsg->data, datalen);
705 
706 	memset(&ihave, 0, sizeof(ihave));
707 	memcpy(ihave.object_id, ireq.object_id, SHA1_DIGEST_LENGTH);
708 	ihave.client_id = client->id;
709 
710 	if (gotd_imsg_compose_event(&client->repo_read->iev, GOTD_IMSG_HAVE,
711 	    PROC_GOTD, -1, &ihave, sizeof(ihave)) == -1)
712 		return got_error_from_errno("imsg compose HAVE");
713 
714 	return NULL;
715 }
716 
717 static int
718 client_has_capability(struct gotd_client *client, const char *capastr)
719 {
720 	struct gotd_client_capability *capa;
721 	size_t i;
722 
723 	if (client->ncapabilities == 0)
724 		return 0;
725 
726 	for (i = 0; i < client->ncapabilities; i++) {
727 		capa = &client->capabilities[i];
728 		if (strcmp(capa->key, capastr) == 0)
729 			return 1;
730 	}
731 
732 	return 0;
733 }
734 
735 static const struct got_error *
736 recv_capabilities(struct gotd_client *client, struct imsg *imsg)
737 {
738 	struct gotd_imsg_capabilities icapas;
739 	size_t datalen;
740 
741 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
742 	if (datalen != sizeof(icapas))
743 		return got_error(GOT_ERR_PRIVSEP_LEN);
744 	memcpy(&icapas, imsg->data, sizeof(icapas));
745 
746 	client->ncapa_alloc = icapas.ncapabilities;
747 	client->capabilities = calloc(client->ncapa_alloc,
748 	    sizeof(*client->capabilities));
749 	if (client->capabilities == NULL) {
750 		client->ncapa_alloc = 0;
751 		return got_error_from_errno("calloc");
752 	}
753 
754 	log_debug("expecting %zu capabilities from uid %d",
755 	    client->ncapa_alloc, client->euid);
756 	return NULL;
757 }
758 
759 static const struct got_error *
760 recv_capability(struct gotd_client *client, struct imsg *imsg)
761 {
762 	struct gotd_imsg_capability icapa;
763 	struct gotd_client_capability *capa;
764 	size_t datalen;
765 	char *key, *value = NULL;
766 
767 	if (client->capabilities == NULL ||
768 	    client->ncapabilities >= client->ncapa_alloc) {
769 		return got_error_msg(GOT_ERR_BAD_REQUEST,
770 		    "unexpected capability received");
771 	}
772 
773 	memset(&icapa, 0, sizeof(icapa));
774 
775 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
776 	if (datalen < sizeof(icapa))
777 		return got_error(GOT_ERR_PRIVSEP_LEN);
778 	memcpy(&icapa, imsg->data, sizeof(icapa));
779 
780 	if (datalen != sizeof(icapa) + icapa.key_len + icapa.value_len)
781 		return got_error(GOT_ERR_PRIVSEP_LEN);
782 
783 	key = malloc(icapa.key_len + 1);
784 	if (key == NULL)
785 		return got_error_from_errno("malloc");
786 	if (icapa.value_len > 0) {
787 		value = malloc(icapa.value_len + 1);
788 		if (value == NULL) {
789 			free(key);
790 			return got_error_from_errno("malloc");
791 		}
792 	}
793 
794 	memcpy(key, imsg->data + sizeof(icapa), icapa.key_len);
795 	key[icapa.key_len] = '\0';
796 	if (value) {
797 		memcpy(value, imsg->data + sizeof(icapa) + icapa.key_len,
798 		    icapa.value_len);
799 		value[icapa.value_len] = '\0';
800 	}
801 
802 	capa = &client->capabilities[client->ncapabilities++];
803 	capa->key = key;
804 	capa->value = value;
805 
806 	if (value)
807 		log_debug("uid %d: capability %s=%s", client->euid, key, value);
808 	else
809 		log_debug("uid %d: capability %s", client->euid, key);
810 
811 	return NULL;
812 }
813 
814 static const struct got_error *
815 send_packfile(struct gotd_client *client)
816 {
817 	const struct got_error *err = NULL;
818 	struct gotd_imsg_send_packfile ipack;
819 	struct gotd_imsg_packfile_pipe ipipe;
820 	int pipe[2];
821 
822 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
823 		return got_error_from_errno("socketpair");
824 
825 	memset(&ipack, 0, sizeof(ipack));
826 	memset(&ipipe, 0, sizeof(ipipe));
827 
828 	ipack.client_id = client->id;
829 	if (client_has_capability(client, GOT_CAPA_SIDE_BAND_64K))
830 		ipack.report_progress = 1;
831 
832 	client->delta_cache_fd = got_opentempfd();
833 	if (client->delta_cache_fd == -1)
834 		return got_error_from_errno("got_opentempfd");
835 
836 	if (gotd_imsg_compose_event(&client->repo_read->iev,
837 	    GOTD_IMSG_SEND_PACKFILE, PROC_GOTD, client->delta_cache_fd,
838 	    &ipack, sizeof(ipack)) == -1) {
839 		err = got_error_from_errno("imsg compose SEND_PACKFILE");
840 		close(pipe[0]);
841 		close(pipe[1]);
842 		return err;
843 	}
844 
845 	ipipe.client_id = client->id;
846 
847 	/* Send pack pipe end 0 to repo_read. */
848 	if (gotd_imsg_compose_event(&client->repo_read->iev,
849 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
850 	        &ipipe, sizeof(ipipe)) == -1) {
851 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
852 		close(pipe[1]);
853 		return err;
854 	}
855 
856 	/* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
857 	if (gotd_imsg_compose_event(&client->iev,
858 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
859 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
860 
861 	return err;
862 }
863 
864 static const struct got_error *
865 recv_packfile(struct gotd_client *client)
866 {
867 	const struct got_error *err = NULL;
868 	struct gotd_imsg_recv_packfile ipack;
869 	struct gotd_imsg_packfile_pipe ipipe;
870 	struct gotd_imsg_packidx_file ifile;
871 	char *basepath = NULL, *pack_path = NULL, *idx_path = NULL;
872 	int packfd = -1, idxfd = -1;
873 	int pipe[2] = { -1, -1 };
874 
875 	if (client->packfile_path) {
876 		return got_error_fmt(GOT_ERR_PRIVSEP_MSG,
877 		    "uid %d already has a pack file", client->euid);
878 	}
879 
880 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe) == -1)
881 		return got_error_from_errno("socketpair");
882 
883 	memset(&ipipe, 0, sizeof(ipipe));
884 	ipipe.client_id = client->id;
885 
886 	if (gotd_imsg_compose_event(&client->repo_write->iev,
887 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
888 	        &ipipe, sizeof(ipipe)) == -1) {
889 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
890 		pipe[0] = -1;
891 		goto done;
892 	}
893 	pipe[0] = -1;
894 
895 	if (gotd_imsg_compose_event(&client->repo_write->iev,
896 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1],
897 	        &ipipe, sizeof(ipipe)) == -1)
898 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
899 	pipe[1] = -1;
900 
901 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.pack",
902 	    client->repo_write->chroot_path, GOT_OBJECTS_PACK_DIR,
903 	    client->euid) == -1) {
904 		err = got_error_from_errno("asprintf");
905 		goto done;
906 	}
907 
908 	err = got_opentemp_named_fd(&pack_path, &packfd, basepath, "");
909 	if (err)
910 		goto done;
911 
912 	free(basepath);
913 	if (asprintf(&basepath, "%s/%s/receiving-from-uid-%d.idx",
914 	    client->repo_write->chroot_path, GOT_OBJECTS_PACK_DIR,
915 	    client->euid) == -1) {
916 		err = got_error_from_errno("asprintf");
917 		basepath = NULL;
918 		goto done;
919 	}
920 	err = got_opentemp_named_fd(&idx_path, &idxfd, basepath, "");
921 	if (err)
922 		goto done;
923 
924 	memset(&ifile, 0, sizeof(ifile));
925 	ifile.client_id = client->id;
926 	if (gotd_imsg_compose_event(&client->repo_write->iev,
927 	    GOTD_IMSG_PACKIDX_FILE, PROC_GOTD, idxfd,
928 	    &ifile, sizeof(ifile)) == -1) {
929 		err = got_error_from_errno("imsg compose PACKIDX_FILE");
930 		idxfd = -1;
931 		goto done;
932 	}
933 	idxfd = -1;
934 
935 	memset(&ipack, 0, sizeof(ipack));
936 	ipack.client_id = client->id;
937 	if (client_has_capability(client, GOT_CAPA_REPORT_STATUS))
938 		ipack.report_status = 1;
939 
940 	if (gotd_imsg_compose_event(&client->repo_write->iev,
941 	    GOTD_IMSG_RECV_PACKFILE, PROC_GOTD, packfd,
942 	    &ipack, sizeof(ipack)) == -1) {
943 		err = got_error_from_errno("imsg compose RECV_PACKFILE");
944 		packfd = -1;
945 		goto done;
946 	}
947 	packfd = -1;
948 
949 done:
950 	free(basepath);
951 	if (pipe[0] != -1 && close(pipe[0]) == -1 && err == NULL)
952 		err = got_error_from_errno("close");
953 	if (pipe[1] != -1 && close(pipe[1]) == -1 && err == NULL)
954 		err = got_error_from_errno("close");
955 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
956 		err = got_error_from_errno("close");
957 	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
958 		err = got_error_from_errno("close");
959 	if (err) {
960 		free(pack_path);
961 		free(idx_path);
962 	} else {
963 		client->packfile_path = pack_path;
964 		client->packidx_path = idx_path;
965 	}
966 	return err;
967 }
968 
969 static void
970 gotd_request(int fd, short events, void *arg)
971 {
972 	struct gotd_imsgev *iev = arg;
973 	struct imsgbuf *ibuf = &iev->ibuf;
974 	struct gotd_client *client = iev->handler_arg;
975 	const struct got_error *err = NULL;
976 	struct imsg imsg;
977 	ssize_t n;
978 
979 	if (events & EV_WRITE) {
980 		while (ibuf->w.queued) {
981 			n = msgbuf_write(&ibuf->w);
982 			if (n == -1 && errno == EPIPE) {
983 				/*
984 				 * The client has closed its socket.
985 				 * This can happen when Git clients are
986 				 * done sending pack file data.
987 				*/
988 				msgbuf_clear(&ibuf->w);
989 				continue;
990 			} else if (n == -1 && errno != EAGAIN) {
991 				err = got_error_from_errno("imsg_flush");
992 				disconnect_on_error(client, err);
993 				return;
994 			}
995 			if (n == 0) {
996 				/* Connection closed. */
997 				err = got_error(GOT_ERR_EOF);
998 				disconnect_on_error(client, err);
999 				return;
1000 			}
1001 		}
1002 
1003 		/* Disconnect gotctl(8) now that messages have been sent. */
1004 		if (!client_is_reading(client) && !client_is_writing(client)) {
1005 			disconnect(client);
1006 			return;
1007 		}
1008 	}
1009 
1010 	if ((events & EV_READ) == 0)
1011 		return;
1012 
1013 	memset(&imsg, 0, sizeof(imsg));
1014 
1015 	while (err == NULL) {
1016 		err = gotd_imsg_recv(&imsg, ibuf, 0);
1017 		if (err) {
1018 			if (err->code == GOT_ERR_PRIVSEP_READ)
1019 				err = NULL;
1020 			break;
1021 		}
1022 
1023 		evtimer_del(&client->tmo);
1024 
1025 		switch (imsg.hdr.type) {
1026 		case GOTD_IMSG_INFO:
1027 			err = send_info(client);
1028 			break;
1029 		case GOTD_IMSG_STOP:
1030 			err = stop_gotd(client);
1031 			break;
1032 		case GOTD_IMSG_LIST_REFS:
1033 			if (client->state != GOTD_STATE_EXPECT_LIST_REFS) {
1034 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1035 				    "unexpected list-refs request received");
1036 				break;
1037 			}
1038 			err = forward_list_refs_request(client, &imsg);
1039 			if (err)
1040 				break;
1041 			client->state = GOTD_STATE_EXPECT_CAPABILITIES;
1042 			log_debug("uid %d: expecting capabilities",
1043 			    client->euid);
1044 			break;
1045 		case GOTD_IMSG_CAPABILITIES:
1046 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1047 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1048 				    "unexpected capabilities received");
1049 				break;
1050 			}
1051 			log_debug("receiving capabilities from uid %d",
1052 			    client->euid);
1053 			err = recv_capabilities(client, &imsg);
1054 			break;
1055 		case GOTD_IMSG_CAPABILITY:
1056 			if (client->state != GOTD_STATE_EXPECT_CAPABILITIES) {
1057 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1058 				    "unexpected capability received");
1059 				break;
1060 			}
1061 			err = recv_capability(client, &imsg);
1062 			if (err || client->ncapabilities < client->ncapa_alloc)
1063 				break;
1064 			if (client_is_reading(client)) {
1065 				client->state = GOTD_STATE_EXPECT_WANT;
1066 				log_debug("uid %d: expecting want-lines",
1067 				    client->euid);
1068 			} else if (client_is_writing(client)) {
1069 				client->state = GOTD_STATE_EXPECT_REF_UPDATE;
1070 				log_debug("uid %d: expecting ref-update-lines",
1071 				    client->euid);
1072 			} else
1073 				fatalx("client %d is both reading and writing",
1074 				    client->euid);
1075 			break;
1076 		case GOTD_IMSG_WANT:
1077 			if (client->state != GOTD_STATE_EXPECT_WANT) {
1078 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1079 				    "unexpected want-line received");
1080 				break;
1081 			}
1082 			log_debug("received want-line from uid %d",
1083 			    client->euid);
1084 			err = ensure_client_is_reading(client);
1085 			if (err)
1086 				break;
1087 			err = forward_want(client, &imsg);
1088 			break;
1089 		case GOTD_IMSG_REF_UPDATE:
1090 			if (client->state != GOTD_STATE_EXPECT_REF_UPDATE) {
1091 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1092 				    "unexpected ref-update-line received");
1093 				break;
1094 			}
1095 			log_debug("received ref-update-line from uid %d",
1096 			    client->euid);
1097 			err = ensure_client_is_writing(client);
1098 			if (err)
1099 				break;
1100 			err = forward_ref_update(client, &imsg);
1101 			if (err)
1102 				break;
1103 			client->state = GOTD_STATE_EXPECT_MORE_REF_UPDATES;
1104 			break;
1105 		case GOTD_IMSG_HAVE:
1106 			if (client->state != GOTD_STATE_EXPECT_HAVE) {
1107 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1108 				    "unexpected have-line received");
1109 				break;
1110 			}
1111 			log_debug("received have-line from uid %d",
1112 			    client->euid);
1113 			err = ensure_client_is_reading(client);
1114 			if (err)
1115 				break;
1116 			err = forward_have(client, &imsg);
1117 			if (err)
1118 				break;
1119 			break;
1120 		case GOTD_IMSG_FLUSH:
1121 			if (client->state == GOTD_STATE_EXPECT_WANT ||
1122 			    client->state == GOTD_STATE_EXPECT_HAVE) {
1123 				err = ensure_client_is_reading(client);
1124 				if (err)
1125 					break;
1126 			} else if (client->state ==
1127 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1128 				err = ensure_client_is_writing(client);
1129 				if (err)
1130 					break;
1131 			} else {
1132 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1133 				    "unexpected flush-pkt received");
1134 				break;
1135 			}
1136 			log_debug("received flush-pkt from uid %d",
1137 			    client->euid);
1138 			if (client->state == GOTD_STATE_EXPECT_WANT) {
1139 				client->state = GOTD_STATE_EXPECT_HAVE;
1140 				log_debug("uid %d: expecting have-lines",
1141 				    client->euid);
1142 			} else if (client->state == GOTD_STATE_EXPECT_HAVE) {
1143 				client->state = GOTD_STATE_EXPECT_DONE;
1144 				log_debug("uid %d: expecting 'done'",
1145 				    client->euid);
1146 			} else if (client->state ==
1147 			    GOTD_STATE_EXPECT_MORE_REF_UPDATES) {
1148 				client->state = GOTD_STATE_EXPECT_PACKFILE;
1149 				log_debug("uid %d: expecting packfile",
1150 				    client->euid);
1151 				err = recv_packfile(client);
1152 			} else {
1153 				/* should not happen, see above */
1154 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1155 				    "unexpected client state");
1156 				break;
1157 			}
1158 			break;
1159 		case GOTD_IMSG_DONE:
1160 			if (client->state != GOTD_STATE_EXPECT_HAVE &&
1161 			    client->state != GOTD_STATE_EXPECT_DONE) {
1162 				err = got_error_msg(GOT_ERR_BAD_REQUEST,
1163 				    "unexpected flush-pkt received");
1164 				break;
1165 			}
1166 			log_debug("received 'done' from uid %d", client->euid);
1167 			err = ensure_client_is_reading(client);
1168 			if (err)
1169 				break;
1170 			client->state = GOTD_STATE_DONE;
1171 			err = send_packfile(client);
1172 			break;
1173 		default:
1174 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1175 			break;
1176 		}
1177 
1178 		imsg_free(&imsg);
1179 	}
1180 
1181 	if (err) {
1182 		if (err->code != GOT_ERR_EOF ||
1183 		    client->state != GOTD_STATE_EXPECT_PACKFILE)
1184 			disconnect_on_error(client, err);
1185 	} else {
1186 		gotd_imsg_event_add(&client->iev);
1187 		evtimer_add(&client->tmo, &timeout);
1188 	}
1189 }
1190 
1191 static void
1192 gotd_request_timeout(int fd, short events, void *arg)
1193 {
1194 	struct gotd_client *client = arg;
1195 
1196 	log_debug("disconnecting uid %d due to timeout", client->euid);
1197 	disconnect(client);
1198 }
1199 
1200 static void
1201 gotd_accept(int fd, short event, void *arg)
1202 {
1203 	struct sockaddr_storage ss;
1204 	struct timeval backoff;
1205 	socklen_t len;
1206 	int s = -1;
1207 	struct gotd_client *client = NULL;
1208 	uid_t euid;
1209 	gid_t egid;
1210 
1211 	backoff.tv_sec = 1;
1212 	backoff.tv_usec = 0;
1213 
1214 	if (event_add(&gotd.ev, NULL) == -1) {
1215 		log_warn("event_add");
1216 		return;
1217 	}
1218 	if (event & EV_TIMEOUT)
1219 		return;
1220 
1221 	len = sizeof(ss);
1222 
1223 	s = accept_reserve(fd, (struct sockaddr *)&ss, &len, GOTD_FD_RESERVE,
1224 	    &inflight);
1225 
1226 	if (s == -1) {
1227 		switch (errno) {
1228 		case EINTR:
1229 		case EWOULDBLOCK:
1230 		case ECONNABORTED:
1231 			return;
1232 		case EMFILE:
1233 		case ENFILE:
1234 			event_del(&gotd.ev);
1235 			evtimer_add(&gotd.pause, &backoff);
1236 			return;
1237 		default:
1238 			log_warn("%s: accept", __func__);
1239 			return;
1240 		}
1241 	}
1242 
1243 	if (client_cnt >= GOTD_MAXCLIENTS)
1244 		goto err;
1245 
1246 	if (getpeereid(s, &euid, &egid) == -1) {
1247 		log_warn("%s: getpeereid", __func__);
1248 		goto err;
1249 	}
1250 
1251 	client = calloc(1, sizeof(*client));
1252 	if (client == NULL) {
1253 		log_warn("%s: calloc", __func__);
1254 		goto err;
1255 	}
1256 
1257 	client->state = GOTD_STATE_EXPECT_LIST_REFS;
1258 	client->id = get_client_id();
1259 	client->fd = s;
1260 	s = -1;
1261 	client->delta_cache_fd = -1;
1262 	client->euid = euid;
1263 	client->egid = egid;
1264 	client->nref_updates = -1;
1265 
1266 	imsg_init(&client->iev.ibuf, client->fd);
1267 	client->iev.handler = gotd_request;
1268 	client->iev.events = EV_READ;
1269 	client->iev.handler_arg = client;
1270 
1271 	event_set(&client->iev.ev, client->fd, EV_READ, gotd_request,
1272 	    &client->iev);
1273 	gotd_imsg_event_add(&client->iev);
1274 
1275 	evtimer_set(&client->tmo, gotd_request_timeout, client);
1276 
1277 	add_client(client);
1278 	log_debug("%s: new client uid %d connected on fd %d", __func__,
1279 	    client->euid, client->fd);
1280 	return;
1281 err:
1282 	inflight--;
1283 	if (s != -1)
1284 		close(s);
1285 	free(client);
1286 }
1287 
1288 static void
1289 gotd_accept_paused(int fd, short event, void *arg)
1290 {
1291 	event_add(&gotd.ev, NULL);
1292 }
1293 
1294 static const char *gotd_proc_names[PROC_MAX] = {
1295 	"parent",
1296 	"repo_read",
1297 	"repo_write"
1298 };
1299 
1300 static struct gotd_child_proc *
1301 get_proc_for_pid(pid_t pid)
1302 {
1303 	struct gotd_child_proc *proc;
1304 	int i;
1305 
1306 	for (i = 0; i < gotd.nprocs; i++) {
1307 		proc = &gotd.procs[i];
1308 		if (proc->pid == pid)
1309 			return proc;
1310 	}
1311 
1312 	return NULL;
1313 }
1314 
1315 static void
1316 kill_proc(struct gotd_child_proc *proc, int fatal)
1317 {
1318 	if (fatal) {
1319 		log_warnx("sending SIGKILL to PID %d", proc->pid);
1320 		kill(proc->pid, SIGKILL);
1321 	} else
1322 		kill(proc->pid, SIGTERM);
1323 }
1324 
1325 static void
1326 gotd_shutdown(void)
1327 {
1328 	pid_t	 pid;
1329 	int	 status, i;
1330 	struct gotd_child_proc *proc;
1331 
1332 	for (i = 0; i < gotd.nprocs; i++) {
1333 		proc = &gotd.procs[i];
1334 		msgbuf_clear(&proc->iev.ibuf.w);
1335 		close(proc->iev.ibuf.fd);
1336 		kill_proc(proc, 0);
1337 	}
1338 
1339 	log_debug("waiting for children to terminate");
1340 	do {
1341 		pid = wait(&status);
1342 		if (pid == -1) {
1343 			if (errno != EINTR && errno != ECHILD)
1344 				fatal("wait");
1345 		} else if (WIFSIGNALED(status)) {
1346 			proc = get_proc_for_pid(pid);
1347 			log_warnx("%s %s child process terminated; signal %d",
1348 			    proc ? gotd_proc_names[proc->type] : "",
1349 			    proc ? proc->chroot_path : "", WTERMSIG(status));
1350 		}	
1351 	} while (pid != -1 || (pid == -1 && errno == EINTR));
1352 
1353 	log_info("terminating");
1354 	exit(0);
1355 }
1356 
1357 void
1358 gotd_sighdlr(int sig, short event, void *arg)
1359 {
1360 	/*
1361 	 * Normal signal handler rules don't apply because libevent
1362 	 * decouples for us.
1363 	 */
1364 
1365 	switch (sig) {
1366 	case SIGHUP:
1367 		log_info("%s: ignoring SIGHUP", __func__);
1368 		break;
1369 	case SIGUSR1:
1370 		log_info("%s: ignoring SIGUSR1", __func__);
1371 		break;
1372 	case SIGTERM:
1373 	case SIGINT:
1374 		gotd_shutdown();
1375 		log_warnx("gotd terminating");
1376 		exit(0);
1377 		break;
1378 	default:
1379 		fatalx("unexpected signal");
1380 	}
1381 }
1382 
1383 static const struct got_error *
1384 ensure_proc_is_reading(struct gotd_client *client,
1385     struct gotd_child_proc *proc)
1386 {
1387 	if (!client_is_reading(client)) {
1388 		kill_proc(proc, 1);
1389 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1390 		    "PID %d handled a read-request for uid %d but this "
1391 		    "user is not reading from a repository", proc->pid,
1392 		    client->euid);
1393 	}
1394 
1395 	return NULL;
1396 }
1397 
1398 static const struct got_error *
1399 ensure_proc_is_writing(struct gotd_client *client,
1400     struct gotd_child_proc *proc)
1401 {
1402 	if (!client_is_writing(client)) {
1403 		kill_proc(proc, 1);
1404 		return got_error_fmt(GOT_ERR_BAD_PACKET,
1405 		    "PID %d handled a write-request for uid %d but this "
1406 		    "user is not writing to a repository", proc->pid,
1407 		    client->euid);
1408 	}
1409 
1410 	return NULL;
1411 }
1412 
1413 static int
1414 verify_imsg_src(struct gotd_client *client, struct gotd_child_proc *proc,
1415     struct imsg *imsg)
1416 {
1417 	const struct got_error *err;
1418 	struct gotd_child_proc *client_proc;
1419 	int ret = 0;
1420 
1421 	client_proc = get_client_proc(client);
1422 	if (client_proc == NULL)
1423 		fatalx("no process found for uid %d", client->euid);
1424 
1425 	if (proc->pid != client_proc->pid) {
1426 		kill_proc(proc, 1);
1427 		log_warnx("received message from PID %d for uid %d, while "
1428 		    "PID %d is the process serving this user",
1429 		    proc->pid, client->euid, client_proc->pid);
1430 		return 0;
1431 	}
1432 
1433 	switch (imsg->hdr.type) {
1434 	case GOTD_IMSG_ERROR:
1435 		ret = 1;
1436 		break;
1437 	case GOTD_IMSG_PACKFILE_DONE:
1438 		err = ensure_proc_is_reading(client, proc);
1439 		if (err)
1440 			log_warnx("uid %d: %s", client->euid, err->msg);
1441 		else
1442 			ret = 1;
1443 		break;
1444 	case GOTD_IMSG_PACKFILE_INSTALL:
1445 	case GOTD_IMSG_REF_UPDATES_START:
1446 	case GOTD_IMSG_REF_UPDATE:
1447 		err = ensure_proc_is_writing(client, proc);
1448 		if (err)
1449 			log_warnx("uid %d: %s", client->euid, err->msg);
1450 		else
1451 			ret = 1;
1452 		break;
1453 	default:
1454 		log_debug("%s: unexpected imsg %d", __func__, imsg->hdr.type);
1455 		break;
1456 	}
1457 
1458 	return ret;
1459 }
1460 
1461 static const struct got_error *
1462 recv_packfile_done(uint32_t *client_id, struct imsg *imsg)
1463 {
1464 	struct gotd_imsg_packfile_done idone;
1465 	size_t datalen;
1466 
1467 	log_debug("packfile-done received");
1468 
1469 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1470 	if (datalen != sizeof(idone))
1471 		return got_error(GOT_ERR_PRIVSEP_LEN);
1472 	memcpy(&idone, imsg->data, sizeof(idone));
1473 
1474 	*client_id = idone.client_id;
1475 	return NULL;
1476 }
1477 
1478 static const struct got_error *
1479 recv_packfile_install(uint32_t *client_id, struct imsg *imsg)
1480 {
1481 	struct gotd_imsg_packfile_install inst;
1482 	size_t datalen;
1483 
1484 	log_debug("packfile-install received");
1485 
1486 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1487 	if (datalen != sizeof(inst))
1488 		return got_error(GOT_ERR_PRIVSEP_LEN);
1489 	memcpy(&inst, imsg->data, sizeof(inst));
1490 
1491 	*client_id = inst.client_id;
1492 	return NULL;
1493 }
1494 
1495 static const struct got_error *
1496 recv_ref_updates_start(uint32_t *client_id, struct imsg *imsg)
1497 {
1498 	struct gotd_imsg_ref_updates_start istart;
1499 	size_t datalen;
1500 
1501 	log_debug("ref-updates-start received");
1502 
1503 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1504 	if (datalen != sizeof(istart))
1505 		return got_error(GOT_ERR_PRIVSEP_LEN);
1506 	memcpy(&istart, imsg->data, sizeof(istart));
1507 
1508 	*client_id = istart.client_id;
1509 	return NULL;
1510 }
1511 
1512 static const struct got_error *
1513 recv_ref_update(uint32_t *client_id, struct imsg *imsg)
1514 {
1515 	struct gotd_imsg_ref_update iref;
1516 	size_t datalen;
1517 
1518 	log_debug("ref-update received");
1519 
1520 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1521 	if (datalen < sizeof(iref))
1522 		return got_error(GOT_ERR_PRIVSEP_LEN);
1523 	memcpy(&iref, imsg->data, sizeof(iref));
1524 
1525 	*client_id = iref.client_id;
1526 	return NULL;
1527 }
1528 
1529 static const struct got_error *
1530 send_ref_update_ok(struct gotd_client *client,
1531     struct gotd_imsg_ref_update *iref, const char *refname)
1532 {
1533 	struct gotd_imsg_ref_update_ok iok;
1534 	struct ibuf *wbuf;
1535 	size_t len;
1536 
1537 	memset(&iok, 0, sizeof(iok));
1538 	iok.client_id = client->id;
1539 	memcpy(iok.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1540 	memcpy(iok.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1541 	iok.name_len = strlen(refname);
1542 
1543 	len = sizeof(iok) + iok.name_len;
1544 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_OK,
1545 	    PROC_GOTD, gotd.pid, len);
1546 	if (wbuf == NULL)
1547 		return got_error_from_errno("imsg_create REF_UPDATE_OK");
1548 
1549 	if (imsg_add(wbuf, &iok, sizeof(iok)) == -1)
1550 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1551 	if (imsg_add(wbuf, refname, iok.name_len) == -1)
1552 		return got_error_from_errno("imsg_add REF_UPDATE_OK");
1553 
1554 	wbuf->fd = -1;
1555 	imsg_close(&client->iev.ibuf, wbuf);
1556 	gotd_imsg_event_add(&client->iev);
1557 	return NULL;
1558 }
1559 
1560 static void
1561 send_refs_updated(struct gotd_client *client)
1562 {
1563 	if (gotd_imsg_compose_event(&client->iev,
1564 	    GOTD_IMSG_REFS_UPDATED, PROC_GOTD, -1, NULL, 0) == -1)
1565 		log_warn("imsg compose REFS_UPDATED");
1566 }
1567 
1568 static const struct got_error *
1569 send_ref_update_ng(struct gotd_client *client,
1570     struct gotd_imsg_ref_update *iref, const char *refname,
1571     const char *reason)
1572 {
1573 	const struct got_error *ng_err;
1574 	struct gotd_imsg_ref_update_ng ing;
1575 	struct ibuf *wbuf;
1576 	size_t len;
1577 
1578 	memset(&ing, 0, sizeof(ing));
1579 	ing.client_id = client->id;
1580 	memcpy(ing.old_id, iref->old_id, SHA1_DIGEST_LENGTH);
1581 	memcpy(ing.new_id, iref->new_id, SHA1_DIGEST_LENGTH);
1582 	ing.name_len = strlen(refname);
1583 
1584 	ng_err = got_error_fmt(GOT_ERR_REF_BUSY, "%s", reason);
1585 	ing.reason_len = strlen(ng_err->msg);
1586 
1587 	len = sizeof(ing) + ing.name_len + ing.reason_len;
1588 	wbuf = imsg_create(&client->iev.ibuf, GOTD_IMSG_REF_UPDATE_NG,
1589 	    PROC_GOTD, gotd.pid, len);
1590 	if (wbuf == NULL)
1591 		return got_error_from_errno("imsg_create REF_UPDATE_NG");
1592 
1593 	if (imsg_add(wbuf, &ing, sizeof(ing)) == -1)
1594 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1595 	if (imsg_add(wbuf, refname, ing.name_len) == -1)
1596 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1597 	if (imsg_add(wbuf, ng_err->msg, ing.reason_len) == -1)
1598 		return got_error_from_errno("imsg_add REF_UPDATE_NG");
1599 
1600 	wbuf->fd = -1;
1601 	imsg_close(&client->iev.ibuf, wbuf);
1602 	gotd_imsg_event_add(&client->iev);
1603 	return NULL;
1604 }
1605 
1606 static const struct got_error *
1607 install_pack(struct gotd_client *client, const char *repo_path,
1608     struct imsg *imsg)
1609 {
1610 	const struct got_error *err = NULL;
1611 	struct gotd_imsg_packfile_install inst;
1612 	char hex[SHA1_DIGEST_STRING_LENGTH];
1613 	size_t datalen;
1614 	char *packfile_path = NULL, *packidx_path = NULL;
1615 
1616 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1617 	if (datalen != sizeof(inst))
1618 		return got_error(GOT_ERR_PRIVSEP_LEN);
1619 	memcpy(&inst, imsg->data, sizeof(inst));
1620 
1621 	if (client->packfile_path == NULL)
1622 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1623 		    "client has no pack file");
1624 	if (client->packidx_path == NULL)
1625 		return got_error_msg(GOT_ERR_BAD_REQUEST,
1626 		    "client has no pack file index");
1627 
1628 	if (got_sha1_digest_to_str(inst.pack_sha1, hex, sizeof(hex)) == NULL)
1629 		return got_error_msg(GOT_ERR_NO_SPACE,
1630 		    "could not convert pack file SHA1 to hex");
1631 
1632 	if (asprintf(&packfile_path, "/%s/%s/pack-%s.pack",
1633 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1634 		err = got_error_from_errno("asprintf");
1635 		goto done;
1636 	}
1637 
1638 	if (asprintf(&packidx_path, "/%s/%s/pack-%s.idx",
1639 	    repo_path, GOT_OBJECTS_PACK_DIR, hex) == -1) {
1640 		err = got_error_from_errno("asprintf");
1641 		goto done;
1642 	}
1643 
1644 	if (rename(client->packfile_path, packfile_path) == -1) {
1645 		err = got_error_from_errno3("rename", client->packfile_path,
1646 		    packfile_path);
1647 		goto done;
1648 	}
1649 
1650 	free(client->packfile_path);
1651 	client->packfile_path = NULL;
1652 
1653 	if (rename(client->packidx_path, packidx_path) == -1) {
1654 		err = got_error_from_errno3("rename", client->packidx_path,
1655 		    packidx_path);
1656 		goto done;
1657 	}
1658 
1659 	free(client->packidx_path);
1660 	client->packidx_path = NULL;
1661 done:
1662 	free(packfile_path);
1663 	free(packidx_path);
1664 	return err;
1665 }
1666 
1667 static const struct got_error *
1668 begin_ref_updates(struct gotd_client *client, struct imsg *imsg)
1669 {
1670 	struct gotd_imsg_ref_updates_start istart;
1671 	size_t datalen;
1672 
1673 	if (client->nref_updates != -1)
1674 		return got_error(GOT_ERR_PRIVSEP_MSG);
1675 
1676 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1677 	if (datalen != sizeof(istart))
1678 		return got_error(GOT_ERR_PRIVSEP_LEN);
1679 	memcpy(&istart, imsg->data, sizeof(istart));
1680 
1681 	if (istart.nref_updates <= 0)
1682 		return got_error(GOT_ERR_PRIVSEP_MSG);
1683 
1684 	client->nref_updates = istart.nref_updates;
1685 	return NULL;
1686 }
1687 
1688 static const struct got_error *
1689 update_ref(struct gotd_client *client, const char *repo_path,
1690     struct imsg *imsg)
1691 {
1692 	const struct got_error *err = NULL;
1693 	struct got_repository *repo = NULL;
1694 	struct got_reference *ref = NULL;
1695 	struct gotd_imsg_ref_update iref;
1696 	struct got_object_id old_id, new_id;
1697 	struct got_object_id *id = NULL;
1698 	struct got_object *obj = NULL;
1699 	char *refname = NULL;
1700 	size_t datalen;
1701 	int locked = 0;
1702 
1703 	log_debug("update-ref from uid %d", client->euid);
1704 
1705 	if (client->nref_updates <= 0)
1706 		return got_error(GOT_ERR_PRIVSEP_MSG);
1707 
1708 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1709 	if (datalen < sizeof(iref))
1710 		return got_error(GOT_ERR_PRIVSEP_LEN);
1711 	memcpy(&iref, imsg->data, sizeof(iref));
1712 	if (datalen != sizeof(iref) + iref.name_len)
1713 		return got_error(GOT_ERR_PRIVSEP_LEN);
1714 	refname = malloc(iref.name_len + 1);
1715 	if (refname == NULL)
1716 		return got_error_from_errno("malloc");
1717 	memcpy(refname, imsg->data + sizeof(iref), iref.name_len);
1718 	refname[iref.name_len] = '\0';
1719 
1720 	log_debug("updating ref %s for uid %d", refname, client->euid);
1721 
1722 	err = got_repo_open(&repo, repo_path, NULL, NULL);
1723 	if (err)
1724 		goto done;
1725 
1726 	memcpy(old_id.sha1, iref.old_id, SHA1_DIGEST_LENGTH);
1727 	memcpy(new_id.sha1, iref.new_id, SHA1_DIGEST_LENGTH);
1728 	err = got_object_open(&obj, repo, &new_id);
1729 	if (err)
1730 		goto done;
1731 
1732 	if (iref.ref_is_new) {
1733 		err = got_ref_open(&ref, repo, refname, 0);
1734 		if (err) {
1735 			if (err->code != GOT_ERR_NOT_REF)
1736 				goto done;
1737 			err = got_ref_alloc(&ref, refname, &new_id);
1738 			if (err)
1739 				goto done;
1740 			err = got_ref_write(ref, repo); /* will lock/unlock */
1741 			if (err)
1742 				goto done;
1743 		} else {
1744 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1745 			    "%s has been created by someone else "
1746 			    "while transaction was in progress",
1747 			    got_ref_get_name(ref));
1748 			goto done;
1749 		}
1750 	} else {
1751 		err = got_ref_open(&ref, repo, refname, 1 /* lock */);
1752 		if (err)
1753 			goto done;
1754 		locked = 1;
1755 
1756 		err = got_ref_resolve(&id, repo, ref);
1757 		if (err)
1758 			goto done;
1759 
1760 		if (got_object_id_cmp(id, &old_id) != 0) {
1761 			err = got_error_fmt(GOT_ERR_REF_BUSY,
1762 			    "%s has been modified by someone else "
1763 			    "while transaction was in progress",
1764 			    got_ref_get_name(ref));
1765 			goto done;
1766 		}
1767 
1768 		err = got_ref_change_ref(ref, &new_id);
1769 		if (err)
1770 			goto done;
1771 
1772 		err = got_ref_write(ref, repo);
1773 		if (err)
1774 			goto done;
1775 
1776 		free(id);
1777 		id = NULL;
1778 	}
1779 done:
1780 	if (err) {
1781 		if (err->code == GOT_ERR_LOCKFILE_TIMEOUT) {
1782 			err = got_error_fmt(GOT_ERR_LOCKFILE_TIMEOUT,
1783 			    "could not acquire exclusive file lock for %s",
1784 			    refname);
1785 		}
1786 		send_ref_update_ng(client, &iref, refname, err->msg);
1787 	} else
1788 		send_ref_update_ok(client, &iref, refname);
1789 
1790 	if (client->nref_updates > 0) {
1791 		client->nref_updates--;
1792 		if (client->nref_updates == 0)
1793 			send_refs_updated(client);
1794 
1795 	}
1796 	if (locked) {
1797 		const struct got_error *unlock_err;
1798 		unlock_err = got_ref_unlock(ref);
1799 		if (unlock_err && err == NULL)
1800 			err = unlock_err;
1801 	}
1802 	if (ref)
1803 		got_ref_close(ref);
1804 	if (obj)
1805 		got_object_close(obj);
1806 	if (repo)
1807 		got_repo_close(repo);
1808 	free(refname);
1809 	free(id);
1810 	return err;
1811 }
1812 
1813 static void
1814 gotd_dispatch(int fd, short event, void *arg)
1815 {
1816 	struct gotd_imsgev *iev = arg;
1817 	struct imsgbuf *ibuf = &iev->ibuf;
1818 	struct gotd_child_proc *proc = NULL;
1819 	ssize_t n;
1820 	int shut = 0;
1821 	struct imsg imsg;
1822 
1823 	if (event & EV_READ) {
1824 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
1825 			fatal("imsg_read error");
1826 		if (n == 0) {
1827 			/* Connection closed. */
1828 			shut = 1;
1829 			goto done;
1830 		}
1831 	}
1832 
1833 	if (event & EV_WRITE) {
1834 		n = msgbuf_write(&ibuf->w);
1835 		if (n == -1 && errno != EAGAIN)
1836 			fatal("msgbuf_write");
1837 		if (n == 0) {
1838 			/* Connection closed. */
1839 			shut = 1;
1840 			goto done;
1841 		}
1842 	}
1843 
1844 	proc = find_proc_by_fd(fd);
1845 	if (proc == NULL)
1846 		fatalx("cannot find child process for fd %d", fd);
1847 
1848 	for (;;) {
1849 		const struct got_error *err = NULL;
1850 		struct gotd_client *client = NULL;
1851 		uint32_t client_id = 0;
1852 		int do_disconnect = 0;
1853 		int do_ref_updates = 0, do_ref_update = 0;
1854 		int do_packfile_install = 0;
1855 
1856 		if ((n = imsg_get(ibuf, &imsg)) == -1)
1857 			fatal("%s: imsg_get error", __func__);
1858 		if (n == 0)	/* No more messages. */
1859 			break;
1860 
1861 		switch (imsg.hdr.type) {
1862 		case GOTD_IMSG_ERROR:
1863 			do_disconnect = 1;
1864 			err = gotd_imsg_recv_error(&client_id, &imsg);
1865 			break;
1866 		case GOTD_IMSG_PACKFILE_DONE:
1867 			do_disconnect = 1;
1868 			err = recv_packfile_done(&client_id, &imsg);
1869 			break;
1870 		case GOTD_IMSG_PACKFILE_INSTALL:
1871 			err = recv_packfile_install(&client_id, &imsg);
1872 			if (err == NULL)
1873 				do_packfile_install = 1;
1874 			break;
1875 		case GOTD_IMSG_REF_UPDATES_START:
1876 			err = recv_ref_updates_start(&client_id, &imsg);
1877 			if (err == NULL)
1878 				do_ref_updates = 1;
1879 			break;
1880 		case GOTD_IMSG_REF_UPDATE:
1881 			err = recv_ref_update(&client_id, &imsg);
1882 			if (err == NULL)
1883 				do_ref_update = 1;
1884 			break;
1885 		default:
1886 			log_debug("unexpected imsg %d", imsg.hdr.type);
1887 			break;
1888 		}
1889 
1890 		client = find_client(client_id);
1891 		if (client == NULL) {
1892 			log_warnx("%s: client not found", __func__);
1893 			imsg_free(&imsg);
1894 			continue;
1895 		}
1896 
1897 		if (!verify_imsg_src(client, proc, &imsg)) {
1898 			log_debug("dropping imsg type %d from PID %d",
1899 			    imsg.hdr.type, proc->pid);
1900 			imsg_free(&imsg);
1901 			continue;
1902 		}
1903 		if (err)
1904 			log_warnx("uid %d: %s", client->euid, err->msg);
1905 
1906 		if (do_disconnect) {
1907 			if (err)
1908 				disconnect_on_error(client, err);
1909 			else
1910 				disconnect(client);
1911 		} else if (do_packfile_install)
1912 			err = install_pack(client, proc->chroot_path, &imsg);
1913 		else if (do_ref_updates)
1914 			err = begin_ref_updates(client, &imsg);
1915 		else if (do_ref_update)
1916 			err = update_ref(client, proc->chroot_path, &imsg);
1917 
1918 		if (err)
1919 			log_warnx("uid %d: %s", client->euid, err->msg);
1920 		imsg_free(&imsg);
1921 	}
1922 done:
1923 	if (!shut) {
1924 		gotd_imsg_event_add(iev);
1925 	} else {
1926 		/* This pipe is dead. Remove its event handler */
1927 		event_del(&iev->ev);
1928 		event_loopexit(NULL);
1929 	}
1930 }
1931 
1932 static pid_t
1933 start_child(enum gotd_procid proc_id, const char *chroot_path,
1934     char *argv0, const char *confpath, int fd, int daemonize, int verbosity)
1935 {
1936 	char	*argv[11];
1937 	int	 argc = 0;
1938 	pid_t	 pid;
1939 
1940 	switch (pid = fork()) {
1941 	case -1:
1942 		fatal("cannot fork");
1943 	case 0:
1944 		break;
1945 	default:
1946 		close(fd);
1947 		return pid;
1948 	}
1949 
1950 	if (fd != GOTD_SOCK_FILENO) {
1951 		if (dup2(fd, GOTD_SOCK_FILENO) == -1)
1952 			fatal("cannot setup imsg fd");
1953 	} else if (fcntl(fd, F_SETFD, 0) == -1)
1954 		fatal("cannot setup imsg fd");
1955 
1956 	argv[argc++] = argv0;
1957 	switch (proc_id) {
1958 	case PROC_REPO_READ:
1959 		argv[argc++] = (char *)"-R";
1960 		break;
1961 	case PROC_REPO_WRITE:
1962 		argv[argc++] = (char *)"-W";
1963 		break;
1964 	default:
1965 		fatalx("invalid process id %d", proc_id);
1966 	}
1967 
1968 	argv[argc++] = (char *)"-f";
1969 	argv[argc++] = (char *)confpath;
1970 
1971 	argv[argc++] = (char *)"-P";
1972 	argv[argc++] = (char *)chroot_path;
1973 
1974 	if (!daemonize)
1975 		argv[argc++] = (char *)"-d";
1976 	if (verbosity > 0)
1977 		argv[argc++] = (char *)"-v";
1978 	if (verbosity > 1)
1979 		argv[argc++] = (char *)"-v";
1980 	argv[argc++] = NULL;
1981 
1982 	execvp(argv0, argv);
1983 	fatal("execvp");
1984 }
1985 
1986 static void
1987 start_repo_children(struct gotd *gotd, char *argv0, const char *confpath,
1988     int daemonize, int verbosity)
1989 {
1990 	struct gotd_repo *repo = NULL;
1991 	struct gotd_child_proc *proc;
1992 	int i;
1993 
1994 	/*
1995 	 * XXX For now, use one reader and one writer per repository.
1996 	 * This should be changed to N readers + M writers.
1997 	 */
1998 	gotd->nprocs = gotd->nrepos * 2;
1999 	gotd->procs = calloc(gotd->nprocs, sizeof(*gotd->procs));
2000 	if (gotd->procs == NULL)
2001 		fatal("calloc");
2002 	for (i = 0; i < gotd->nprocs; i++) {
2003 		if (repo == NULL)
2004 			repo = TAILQ_FIRST(&gotd->repos);
2005 		proc = &gotd->procs[i];
2006 		if (i < gotd->nrepos)
2007 			proc->type = PROC_REPO_READ;
2008 		else
2009 			proc->type = PROC_REPO_WRITE;
2010 		if (strlcpy(proc->repo_name, repo->name,
2011 		    sizeof(proc->repo_name)) >= sizeof(proc->repo_name))
2012 			fatalx("repository name too long: %s", repo->name);
2013 		log_debug("adding repository %s", repo->name);
2014 		if (realpath(repo->path, proc->chroot_path) == NULL)
2015 			fatal("%s", repo->path);
2016 		if (socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK,
2017 		    PF_UNSPEC, proc->pipe) == -1)
2018 			fatal("socketpair");
2019 		proc->pid = start_child(proc->type, proc->chroot_path, argv0,
2020 		    confpath, proc->pipe[1], daemonize, verbosity);
2021 		imsg_init(&proc->iev.ibuf, proc->pipe[0]);
2022 		log_debug("proc %s %s is on fd %d",
2023 		    gotd_proc_names[proc->type], proc->chroot_path,
2024 		    proc->pipe[0]);
2025 		proc->iev.handler = gotd_dispatch;
2026 		proc->iev.events = EV_READ;
2027 		proc->iev.handler_arg = NULL;
2028 		event_set(&proc->iev.ev, proc->iev.ibuf.fd, EV_READ,
2029 		    gotd_dispatch, &proc->iev);
2030 
2031 		repo = TAILQ_NEXT(repo, entry);
2032 	}
2033 }
2034 
2035 static void
2036 apply_unveil(void)
2037 {
2038 	struct gotd_repo *repo;
2039 
2040 	TAILQ_FOREACH(repo, &gotd.repos, entry) {
2041 		if (unveil(repo->path, "rwc") == -1)
2042 			fatal("unveil %s", repo->path);
2043 	}
2044 
2045 	if (unveil(GOT_TMPDIR_STR, "rwc") == -1)
2046 		fatal("unveil %s", GOT_TMPDIR_STR);
2047 
2048 	if (unveil(NULL, NULL) == -1)
2049 		fatal("unveil");
2050 }
2051 
2052 int
2053 main(int argc, char **argv)
2054 {
2055 	const struct got_error *error = NULL;
2056 	int ch, fd = -1, daemonize = 1, verbosity = 0, noaction = 0;
2057 	const char *confpath = GOTD_CONF_PATH;
2058 	char *argv0 = argv[0];
2059 	char title[2048];
2060 	gid_t groups[NGROUPS_MAX + 1];
2061 	int ngroups = NGROUPS_MAX + 1;
2062 	struct passwd *pw = NULL;
2063 	struct group *gr = NULL;
2064 	char *repo_path = NULL;
2065 	enum gotd_procid proc_id = PROC_GOTD;
2066 	struct event evsigint, evsigterm, evsighup, evsigusr1;
2067 	int *pack_fds = NULL, *temp_fds = NULL;
2068 
2069 	log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
2070 
2071 	while ((ch = getopt(argc, argv, "df:nP:RvW")) != -1) {
2072 		switch (ch) {
2073 		case 'd':
2074 			daemonize = 0;
2075 			break;
2076 		case 'f':
2077 			confpath = optarg;
2078 			break;
2079 		case 'n':
2080 			noaction = 1;
2081 			break;
2082 		case 'P':
2083 			repo_path = realpath(optarg, NULL);
2084 			if (repo_path == NULL)
2085 				fatal("realpath '%s'", optarg);
2086 			break;
2087 		case 'R':
2088 			proc_id = PROC_REPO_READ;
2089 			break;
2090 		case 'v':
2091 			if (verbosity < 3)
2092 				verbosity++;
2093 			break;
2094 		case 'W':
2095 			proc_id = PROC_REPO_WRITE;
2096 			break;
2097 		default:
2098 			usage();
2099 		}
2100 	}
2101 
2102 	argc -= optind;
2103 	argv += optind;
2104 
2105 	if (argc != 0)
2106 		usage();
2107 
2108 	if (geteuid())
2109 		fatalx("need root privileges");
2110 
2111 	log_init(daemonize ? 0 : 1, LOG_DAEMON);
2112 	log_setverbose(verbosity);
2113 
2114 	if (parse_config(confpath, proc_id, &gotd) != 0)
2115 		return 1;
2116 
2117 	if (proc_id == PROC_GOTD &&
2118 	    (gotd.nrepos == 0 || TAILQ_EMPTY(&gotd.repos)))
2119 		fatalx("no repository defined in configuration file");
2120 
2121 	pw = getpwnam(gotd.user_name);
2122 	if (pw == NULL)
2123 		fatal("getpwuid: user %s not found", gotd.user_name);
2124 
2125 	if (pw->pw_uid == 0) {
2126 		fatalx("cannot run %s as %s: the user running %s "
2127 		    "must not be the superuser",
2128 		    getprogname(), pw->pw_name, getprogname());
2129 	}
2130 
2131 	if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1)
2132 		log_warnx("group membership list truncated");
2133 
2134 	gr = match_group(groups, ngroups, gotd.unix_group_name);
2135 	if (gr == NULL) {
2136 		fatalx("cannot start %s: the user running %s "
2137 		    "must be a secondary member of group %s",
2138 		    getprogname(), getprogname(), gotd.unix_group_name);
2139 	}
2140 	if (gr->gr_gid == pw->pw_gid) {
2141 		fatalx("cannot start %s: the user running %s "
2142 		    "must be a secondary member of group %s, but "
2143 		    "%s is the user's primary group",
2144 		    getprogname(), getprogname(), gotd.unix_group_name,
2145 		    gotd.unix_group_name);
2146 	}
2147 
2148 	if (proc_id == PROC_GOTD &&
2149 	    !got_path_is_absolute(gotd.unix_socket_path))
2150 		fatalx("bad unix socket path \"%s\": must be an absolute path",
2151 		    gotd.unix_socket_path);
2152 
2153 	if (noaction)
2154 		return 0;
2155 
2156 	if (proc_id == PROC_GOTD && verbosity) {
2157 		log_info("socket: %s", gotd.unix_socket_path);
2158 		log_info("user: %s", pw->pw_name);
2159 		log_info("secondary group: %s", gr->gr_name);
2160 
2161 		fd = unix_socket_listen(gotd.unix_socket_path, pw->pw_uid,
2162 		    gr->gr_gid);
2163 		if (fd == -1) {
2164 			fatal("cannot listen on unix socket %s",
2165 			    gotd.unix_socket_path);
2166 		}
2167 	}
2168 
2169 	if (proc_id == PROC_GOTD) {
2170 		gotd.pid = getpid();
2171 		snprintf(title, sizeof(title), "%s", gotd_proc_names[proc_id]);
2172 		start_repo_children(&gotd, argv0, confpath, daemonize,
2173 		    verbosity);
2174 		arc4random_buf(&clients_hash_key, sizeof(clients_hash_key));
2175 		if (daemonize && daemon(0, 0) == -1)
2176 			fatal("daemon");
2177 	} else if (proc_id == PROC_REPO_READ || proc_id == PROC_REPO_WRITE) {
2178 		error = got_repo_pack_fds_open(&pack_fds);
2179 		if (error != NULL)
2180 			fatalx("cannot open pack tempfiles: %s", error->msg);
2181 		error = got_repo_temp_fds_open(&temp_fds);
2182 		if (error != NULL)
2183 			fatalx("cannot open pack tempfiles: %s", error->msg);
2184 		if (repo_path == NULL)
2185 			fatalx("repository path not specified");
2186 		snprintf(title, sizeof(title), "%s %s",
2187 		    gotd_proc_names[proc_id], repo_path);
2188 		if (chroot(repo_path) == -1)
2189 			fatal("chroot");
2190 		if (chdir("/") == -1)
2191 			fatal("chdir(\"/\")");
2192 		if (daemonize && daemon(1, 0) == -1)
2193 			fatal("daemon");
2194 	} else
2195 		fatal("invalid process id %d", proc_id);
2196 
2197 	setproctitle("%s", title);
2198 	log_procinit(title);
2199 
2200 	/* Drop root privileges. */
2201 	if (setgid(pw->pw_gid) == -1)
2202 		fatal("setgid %d failed", pw->pw_gid);
2203 	if (setuid(pw->pw_uid) == -1)
2204 		fatal("setuid %d failed", pw->pw_uid);
2205 
2206 	event_init();
2207 
2208 	switch (proc_id) {
2209 	case PROC_GOTD:
2210 #ifndef PROFILE
2211 		if (pledge("stdio rpath wpath cpath proc getpw sendfd recvfd "
2212 		    "fattr flock unix unveil", NULL) == -1)
2213 			err(1, "pledge");
2214 #endif
2215 		break;
2216 	case PROC_REPO_READ:
2217 #ifndef PROFILE
2218 		if (pledge("stdio rpath recvfd", NULL) == -1)
2219 			err(1, "pledge");
2220 #endif
2221 		repo_read_main(title, pack_fds, temp_fds);
2222 		/* NOTREACHED */
2223 		exit(0);
2224 	case PROC_REPO_WRITE:
2225 #ifndef PROFILE
2226 		if (pledge("stdio rpath sendfd recvfd", NULL) == -1)
2227 			err(1, "pledge");
2228 #endif
2229 		repo_write_main(title, pack_fds, temp_fds);
2230 		/* NOTREACHED */
2231 		exit(0);
2232 	default:
2233 		fatal("invalid process id %d", proc_id);
2234 	}
2235 
2236 	if (proc_id != PROC_GOTD)
2237 		fatal("invalid process id %d", proc_id);
2238 
2239 	apply_unveil();
2240 
2241 	signal_set(&evsigint, SIGINT, gotd_sighdlr, NULL);
2242 	signal_set(&evsigterm, SIGTERM, gotd_sighdlr, NULL);
2243 	signal_set(&evsighup, SIGHUP, gotd_sighdlr, NULL);
2244 	signal_set(&evsigusr1, SIGUSR1, gotd_sighdlr, NULL);
2245 	signal(SIGPIPE, SIG_IGN);
2246 
2247 	signal_add(&evsigint, NULL);
2248 	signal_add(&evsigterm, NULL);
2249 	signal_add(&evsighup, NULL);
2250 	signal_add(&evsigusr1, NULL);
2251 
2252 	event_set(&gotd.ev, fd, EV_READ | EV_PERSIST, gotd_accept, NULL);
2253 	if (event_add(&gotd.ev, NULL))
2254 		fatalx("event add");
2255 	evtimer_set(&gotd.pause, gotd_accept_paused, NULL);
2256 
2257 	event_dispatch();
2258 
2259 	if (fd != -1)
2260 		close(fd);
2261 	if (pack_fds)
2262 		got_repo_pack_fds_close(pack_fds);
2263 	free(repo_path);
2264 	return 0;
2265 }