1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/uio.h>
20 #include <sys/wait.h>
21 
22 #include <ctype.h>
23 #include <limits.h>
24 #include <signal.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <stdint.h>
30 #include <poll.h>
31 #include <unistd.h>
32 #include <zlib.h>
33 #include <time.h>
34 
35 #include "got_compat.h"
36 
37 #include "got_object.h"
38 #include "got_error.h"
39 #include "got_path.h"
40 #include "got_repository.h"
41 
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49 
50 #ifndef MIN
51 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
52 #endif
53 
54 #ifndef nitems
55 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
56 #endif
57 
58 static const struct got_error *
59 poll_fd(int fd, int events, int timeout)
60 {
61 	struct pollfd pfd[1];
62 	struct timespec ts;
63 	sigset_t sigset;
64 	int n;
65 
66 	pfd[0].fd = fd;
67 	pfd[0].events = events;
68 
69 	ts.tv_sec = timeout;
70 	ts.tv_nsec = 0;
71 
72 	if (sigemptyset(&sigset) == -1)
73 		return got_error_from_errno("sigemptyset");
74 	if (sigaddset(&sigset, SIGWINCH) == -1)
75 		return got_error_from_errno("sigaddset");
76 
77 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
78 	if (n == -1)
79 		return got_error_from_errno("ppoll");
80 	if (n == 0)
81 		return got_error(GOT_ERR_TIMEOUT);
82 	if (pfd[0].revents & (POLLERR | POLLNVAL))
83 		return got_error_from_errno("poll error");
84 	if (pfd[0].revents & (events | POLLHUP))
85 		return NULL;
86 
87 	return got_error(GOT_ERR_INTERRUPT);
88 }
89 
90 static const struct got_error *
91 read_imsg(struct imsgbuf *ibuf)
92 {
93 	const struct got_error *err;
94 	size_t n;
95 
96 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
97 	if (err)
98 		return err;
99 
100 	n = imsg_read(ibuf);
101 	if (n == -1) {
102 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
103 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
104 		return got_error(GOT_ERR_PRIVSEP_READ);
105 	}
106 	if (n == 0)
107 		return got_error(GOT_ERR_PRIVSEP_PIPE);
108 
109 	return NULL;
110 }
111 
112 const struct got_error *
113 got_privsep_wait_for_child(pid_t pid)
114 {
115 	int child_status;
116 
117 	if (waitpid(pid, &child_status, 0) == -1)
118 		return got_error_from_errno("waitpid");
119 
120 	if (!WIFEXITED(child_status))
121 		return got_error(GOT_ERR_PRIVSEP_DIED);
122 
123 	if (WEXITSTATUS(child_status) != 0)
124 		return got_error(GOT_ERR_PRIVSEP_EXIT);
125 
126 	return NULL;
127 }
128 
129 static const struct got_error *
130 recv_imsg_error(struct imsg *imsg, size_t datalen)
131 {
132 	struct got_imsg_error *ierr;
133 
134 	if (datalen != sizeof(*ierr))
135 		return got_error(GOT_ERR_PRIVSEP_LEN);
136 
137 	ierr = imsg->data;
138 	if (ierr->code == GOT_ERR_ERRNO) {
139 		static struct got_error serr;
140 		serr.code = GOT_ERR_ERRNO;
141 		serr.msg = strerror(ierr->errno_code);
142 		return &serr;
143 	}
144 
145 	return got_error(ierr->code);
146 }
147 
148 const struct got_error *
149 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
150     size_t min_datalen)
151 {
152 	const struct got_error *err;
153 	ssize_t n;
154 
155 	n = imsg_get(ibuf, imsg);
156 	if (n == -1)
157 		return got_error_from_errno("imsg_get");
158 
159 	while (n == 0) {
160 		err = read_imsg(ibuf);
161 		if (err)
162 			return err;
163 		n = imsg_get(ibuf, imsg);
164 		if (n == -1)
165 			return got_error_from_errno("imsg_get");
166 	}
167 
168 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
169 		return got_error(GOT_ERR_PRIVSEP_LEN);
170 
171 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
172 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
173 		return recv_imsg_error(imsg, datalen);
174 	}
175 
176 	return NULL;
177 }
178 
179 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
180 void
181 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
182 {
183 	const struct got_error *poll_err;
184 	struct got_imsg_error ierr;
185 	int ret;
186 
187 	ierr.code = err->code;
188 	if (err->code == GOT_ERR_ERRNO)
189 		ierr.errno_code = errno;
190 	else
191 		ierr.errno_code = 0;
192 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
193 	if (ret == -1) {
194 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
195 		    getprogname(), err->code, err->msg, strerror(errno));
196 		return;
197 	}
198 
199 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
200 	if (poll_err) {
201 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
202 		    getprogname(), err->code, err->msg, poll_err->msg);
203 		return;
204 	}
205 
206 	ret = imsg_flush(ibuf);
207 	if (ret == -1) {
208 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
209 		    getprogname(), err->code, err->msg, strerror(errno));
210 		return;
211 	}
212 }
213 
214 static const struct got_error *
215 flush_imsg(struct imsgbuf *ibuf)
216 {
217 	const struct got_error *err;
218 
219 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
220 	if (err)
221 		return err;
222 
223 	if (imsg_flush(ibuf) == -1)
224 		return got_error_from_errno("imsg_flush");
225 
226 	return NULL;
227 }
228 
229 const struct got_error *
230 got_privsep_flush_imsg(struct imsgbuf *ibuf)
231 {
232 	return flush_imsg(ibuf);
233 }
234 
235 const struct got_error *
236 got_privsep_send_stop(int fd)
237 {
238 	const struct got_error *err = NULL;
239 	struct imsgbuf ibuf;
240 
241 	imsg_init(&ibuf, fd);
242 
243 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
244 		return got_error_from_errno("imsg_compose STOP");
245 
246 	err = flush_imsg(&ibuf);
247 	imsg_clear(&ibuf);
248 	return err;
249 }
250 
251 const struct got_error *
252 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
253     struct got_object_id *id)
254 {
255 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
256 	    id, sizeof(*id)) == -1)
257 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
258 
259 	return flush_imsg(ibuf);
260 }
261 
262 const struct got_error *
263 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
264     struct got_object_id *id)
265 {
266 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
267 	    id, sizeof(*id)) == -1)
268 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
269 
270 	return flush_imsg(ibuf);
271 }
272 
273 const struct got_error *
274 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
275 {
276 	const struct got_error *err = NULL;
277 
278 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
279 	    == -1) {
280 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
281 		close(outfd);
282 		return err;
283 	}
284 
285 	return flush_imsg(ibuf);
286 }
287 
288 const struct got_error *
289 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
290     uint8_t *data)
291 {
292 	const struct got_error *err = NULL;
293 	struct got_imsg_raw_obj iobj;
294 	size_t len = sizeof(iobj);
295 	struct ibuf *wbuf;
296 
297 	iobj.hdrlen = hdrlen;
298 	iobj.size = size;
299 
300 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
301 		len += (size_t)size + hdrlen;
302 
303 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
304 	if (wbuf == NULL) {
305 		err = got_error_from_errno("imsg_create RAW_OBJECT");
306 		return err;
307 	}
308 
309 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1) {
310 		err = got_error_from_errno("imsg_add RAW_OBJECT");
311 		ibuf_free(wbuf);
312 		return err;
313 	}
314 
315 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
316 		if (imsg_add(wbuf, data, size + hdrlen) == -1) {
317 			err = got_error_from_errno("imsg_add RAW_OBJECT");
318 			ibuf_free(wbuf);
319 			return err;
320 		}
321 	}
322 
323 	wbuf->fd = -1;
324 	imsg_close(ibuf, wbuf);
325 
326 	return flush_imsg(ibuf);
327 }
328 
329 const struct got_error *
330 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
331     struct imsgbuf *ibuf)
332 {
333 	const struct got_error *err = NULL;
334 	struct imsg imsg;
335 	struct got_imsg_raw_obj *iobj;
336 	size_t datalen;
337 
338 	*outbuf = NULL;
339 
340 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
341 	if (err)
342 		return err;
343 
344 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
345 
346 	switch (imsg.hdr.type) {
347 	case GOT_IMSG_RAW_OBJECT:
348 		if (datalen < sizeof(*iobj)) {
349 			err = got_error(GOT_ERR_PRIVSEP_LEN);
350 			break;
351 		}
352 		iobj = imsg.data;
353 		*size = iobj->size;
354 		*hdrlen = iobj->hdrlen;
355 
356 		if (datalen == sizeof(*iobj)) {
357 			/* Data has been written to file descriptor. */
358 			break;
359 		}
360 
361 		if (*size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
362 			err = got_error(GOT_ERR_PRIVSEP_LEN);
363 			break;
364 		}
365 
366 		*outbuf = malloc(*size + *hdrlen);
367 		if (*outbuf == NULL) {
368 			err = got_error_from_errno("malloc");
369 			break;
370 		}
371 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
372 		break;
373 	default:
374 		err = got_error(GOT_ERR_PRIVSEP_MSG);
375 		break;
376 	}
377 
378 	imsg_free(&imsg);
379 
380 	return err;
381 }
382 
383 const struct got_error *
384 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
385     struct got_object_id *id, int pack_idx)
386 {
387 	const struct got_error *err = NULL;
388 	struct got_imsg_packed_object iobj;
389 	void *data;
390 	size_t len;
391 
392 	if (pack_idx != -1) { /* commit is packed */
393 		iobj.idx = pack_idx;
394 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
395 		data = &iobj;
396 		len = sizeof(iobj);
397 	} else {
398 		data = id;
399 		len = sizeof(*id);
400 	}
401 
402 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
403 	    == -1) {
404 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
405 		close(fd);
406 		return err;
407 	}
408 
409 	return flush_imsg(ibuf);
410 }
411 
412 const struct got_error *
413 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
414     struct got_object_id *id, int pack_idx)
415 {
416 	const struct got_error *err = NULL;
417 	struct ibuf *wbuf;
418 	size_t len;
419 
420 	if (pack_idx != -1)
421 		len = sizeof(struct got_imsg_packed_object);
422 	else
423 		len = sizeof(*id);
424 
425 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
426 	if (wbuf == NULL)
427 		return got_error_from_errno("imsg_create TREE_REQUEST");
428 
429 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
430 		err = got_error_from_errno("imsg_add TREE_ENTRY");
431 		ibuf_free(wbuf);
432 		return err;
433 	}
434 
435 	if (pack_idx != -1) { /* tree is packed */
436 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1) {
437 			err = got_error_from_errno("imsg_add TREE_ENTRY");
438 			ibuf_free(wbuf);
439 			return err;
440 		}
441 	}
442 
443 	wbuf->fd = fd;
444 	imsg_close(ibuf, wbuf);
445 
446 	return flush_imsg(ibuf);
447 }
448 
449 const struct got_error *
450 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
451     struct got_object_id *id, int pack_idx)
452 {
453 	struct got_imsg_packed_object iobj;
454 	void *data;
455 	size_t len;
456 
457 	if (pack_idx != -1) { /* tag is packed */
458 		iobj.idx = pack_idx;
459 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
460 		data = &iobj;
461 		len = sizeof(iobj);
462 	} else {
463 		data = id;
464 		len = sizeof(*id);
465 	}
466 
467 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
468 	    == -1)
469 		return got_error_from_errno("imsg_compose TAG_REQUEST");
470 
471 	return flush_imsg(ibuf);
472 }
473 
474 const struct got_error *
475 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
476     struct got_object_id *id, int pack_idx)
477 {
478 	const struct got_error *err = NULL;
479 	struct got_imsg_packed_object iobj;
480 	void *data;
481 	size_t len;
482 
483 	if (pack_idx != -1) { /* blob is packed */
484 		iobj.idx = pack_idx;
485 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
486 		data = &iobj;
487 		len = sizeof(iobj);
488 	} else {
489 		data = id;
490 		len = sizeof(*id);
491 	}
492 
493 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
494 	    == -1) {
495 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
496 		close(infd);
497 		return err;
498 	}
499 
500 	return flush_imsg(ibuf);
501 }
502 
503 const struct got_error *
504 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
505 {
506 	const struct got_error *err = NULL;
507 
508 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
509 	    == -1) {
510 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
511 		close(outfd);
512 		return err;
513 	}
514 
515 	return flush_imsg(ibuf);
516 }
517 
518 static const struct got_error *
519 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
520 {
521 	const struct got_error *err = NULL;
522 
523 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
524 		err = got_error_from_errno("imsg_compose TMPFD");
525 		close(fd);
526 		return err;
527 	}
528 
529 	return flush_imsg(ibuf);
530 }
531 
532 const struct got_error *
533 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
534 {
535 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
536 }
537 
538 const struct got_error *
539 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
540 {
541 	struct got_imsg_object iobj;
542 
543 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
544 	iobj.type = obj->type;
545 	iobj.flags = obj->flags;
546 	iobj.hdrlen = obj->hdrlen;
547 	iobj.size = obj->size;
548 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
549 		iobj.pack_offset = obj->pack_offset;
550 		iobj.pack_idx = obj->pack_idx;
551 	}
552 
553 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
554 	    == -1)
555 		return got_error_from_errno("imsg_compose OBJECT");
556 
557 	return flush_imsg(ibuf);
558 }
559 
560 const struct got_error *
561 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
562     struct got_pathlist_head *have_refs, int fetch_all_branches,
563     struct got_pathlist_head *wanted_branches,
564     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
565 {
566 	const struct got_error *err = NULL;
567 	struct ibuf *wbuf;
568 	size_t len;
569 	struct got_pathlist_entry *pe;
570 	struct got_imsg_fetch_request fetchreq;
571 
572 	memset(&fetchreq, 0, sizeof(fetchreq));
573 	fetchreq.fetch_all_branches = fetch_all_branches;
574 	fetchreq.list_refs_only = list_refs_only;
575 	fetchreq.verbosity = verbosity;
576 	TAILQ_FOREACH(pe, have_refs, entry)
577 		fetchreq.n_have_refs++;
578 	TAILQ_FOREACH(pe, wanted_branches, entry)
579 		fetchreq.n_wanted_branches++;
580 	TAILQ_FOREACH(pe, wanted_refs, entry)
581 		fetchreq.n_wanted_refs++;
582 	len = sizeof(struct got_imsg_fetch_request);
583 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
584 		close(fd);
585 		return got_error(GOT_ERR_NO_SPACE);
586 	}
587 
588 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
589 	    &fetchreq, sizeof(fetchreq)) == -1)
590 		return got_error_from_errno(
591 		    "imsg_compose FETCH_SERVER_PROGRESS");
592 
593 	err = flush_imsg(ibuf);
594 	if (err) {
595 		close(fd);
596 		return err;
597 	}
598 	fd = -1;
599 
600 	TAILQ_FOREACH(pe, have_refs, entry) {
601 		const char *name = pe->path;
602 		size_t name_len = pe->path_len;
603 		struct got_object_id *id = pe->data;
604 
605 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
606 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
607 		if (wbuf == NULL)
608 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
609 
610 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
611 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1) {
612 			err = got_error_from_errno("imsg_add FETCH_HAVE_REF");
613 			ibuf_free(wbuf);
614 			return err;
615 		}
616 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
617 			err = got_error_from_errno("imsg_add FETCH_HAVE_REF");
618 			ibuf_free(wbuf);
619 			return err;
620 		}
621 		if (imsg_add(wbuf, name, name_len) == -1) {
622 			err = got_error_from_errno("imsg_add FETCH_HAVE_REF");
623 			ibuf_free(wbuf);
624 			return err;
625 		}
626 
627 		wbuf->fd = -1;
628 		imsg_close(ibuf, wbuf);
629 		err = flush_imsg(ibuf);
630 		if (err)
631 			return err;
632 	}
633 
634 	TAILQ_FOREACH(pe, wanted_branches, entry) {
635 		const char *name = pe->path;
636 		size_t name_len = pe->path_len;
637 
638 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
639 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
640 		    len);
641 		if (wbuf == NULL)
642 			return got_error_from_errno(
643 			    "imsg_create FETCH_WANTED_BRANCH");
644 
645 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
646 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
647 			err = got_error_from_errno(
648 			    "imsg_add FETCH_WANTED_BRANCH");
649 			ibuf_free(wbuf);
650 			return err;
651 		}
652 		if (imsg_add(wbuf, name, name_len) == -1) {
653 			err = got_error_from_errno(
654 			    "imsg_add FETCH_WANTED_BRANCH");
655 			ibuf_free(wbuf);
656 			return err;
657 		}
658 
659 		wbuf->fd = -1;
660 		imsg_close(ibuf, wbuf);
661 		err = flush_imsg(ibuf);
662 		if (err)
663 			return err;
664 	}
665 
666 	TAILQ_FOREACH(pe, wanted_refs, entry) {
667 		const char *name = pe->path;
668 		size_t name_len = pe->path_len;
669 
670 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
671 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
672 		    len);
673 		if (wbuf == NULL)
674 			return got_error_from_errno(
675 			    "imsg_create FETCH_WANTED_REF");
676 
677 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
678 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
679 			err = got_error_from_errno(
680 			    "imsg_add FETCH_WANTED_REF");
681 			ibuf_free(wbuf);
682 			return err;
683 		}
684 		if (imsg_add(wbuf, name, name_len) == -1) {
685 			err = got_error_from_errno(
686 			    "imsg_add FETCH_WANTED_REF");
687 			ibuf_free(wbuf);
688 			return err;
689 		}
690 
691 		wbuf->fd = -1;
692 		imsg_close(ibuf, wbuf);
693 		err = flush_imsg(ibuf);
694 		if (err)
695 			return err;
696 	}
697 
698 
699 	return NULL;
700 
701 }
702 
703 const struct got_error *
704 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
705 {
706 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
707 }
708 
709 const struct got_error *
710 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
711     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
712     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
713 {
714 	const struct got_error *err = NULL;
715 	struct imsg imsg;
716 	size_t datalen;
717 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
718 	size_t n, remain;
719 	off_t off;
720 	int i;
721 
722 	*done = 0;
723 	*id = NULL;
724 	*refname = NULL;
725 	*server_progress = NULL;
726 	*packfile_size = 0;
727 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
728 
729 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
730 	if (err)
731 		return err;
732 
733 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
734 	switch (imsg.hdr.type) {
735 	case GOT_IMSG_ERROR:
736 		if (datalen < sizeof(struct got_imsg_error)) {
737 			err = got_error(GOT_ERR_PRIVSEP_LEN);
738 			break;
739 		}
740 		err = recv_imsg_error(&imsg, datalen);
741 		break;
742 	case GOT_IMSG_FETCH_SYMREFS:
743 		if (datalen < sizeof(*isymrefs)) {
744 			err = got_error(GOT_ERR_PRIVSEP_LEN);
745 			break;
746 		}
747 		if (isymrefs != NULL) {
748 			err = got_error(GOT_ERR_PRIVSEP_MSG);
749 			break;
750 		}
751 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
752 		off = sizeof(*isymrefs);
753 		remain = datalen - off;
754 		for (n = 0; n < isymrefs->nsymrefs; n++) {
755 			struct got_imsg_fetch_symref *s;
756 			char *name, *target;
757 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
758 				err = got_error(GOT_ERR_PRIVSEP_LEN);
759 				goto done;
760 			}
761 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
762 			off += sizeof(*s);
763 			remain -= sizeof(*s);
764 			if (remain < s->name_len) {
765 				err = got_error(GOT_ERR_PRIVSEP_LEN);
766 				goto done;
767 			}
768 			name = strndup(imsg.data + off, s->name_len);
769 			if (name == NULL) {
770 				err = got_error_from_errno("strndup");
771 				goto done;
772 			}
773 			off += s->name_len;
774 			remain -= s->name_len;
775 			if (remain < s->target_len) {
776 				err = got_error(GOT_ERR_PRIVSEP_LEN);
777 				free(name);
778 				goto done;
779 			}
780 			target = strndup(imsg.data + off, s->target_len);
781 			if (target == NULL) {
782 				err = got_error_from_errno("strndup");
783 				free(name);
784 				goto done;
785 			}
786 			off += s->target_len;
787 			remain -= s->target_len;
788 			err = got_pathlist_append(symrefs, name, target);
789 			if (err) {
790 				free(name);
791 				free(target);
792 				goto done;
793 			}
794 		}
795 		break;
796 	case GOT_IMSG_FETCH_REF:
797 		if (datalen <= SHA1_DIGEST_LENGTH) {
798 			err = got_error(GOT_ERR_PRIVSEP_MSG);
799 			break;
800 		}
801 		*id = malloc(sizeof(**id));
802 		if (*id == NULL) {
803 			err = got_error_from_errno("malloc");
804 			break;
805 		}
806 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
807 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
808 		    datalen - SHA1_DIGEST_LENGTH);
809 		if (*refname == NULL) {
810 			err = got_error_from_errno("strndup");
811 			break;
812 		}
813 		break;
814 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
815 		if (datalen == 0) {
816 			err = got_error(GOT_ERR_PRIVSEP_LEN);
817 			break;
818 		}
819 		*server_progress = strndup(imsg.data, datalen);
820 		if (*server_progress == NULL) {
821 			err = got_error_from_errno("strndup");
822 			break;
823 		}
824 		for (i = 0; i < datalen; i++) {
825 			if (!isprint((unsigned char)(*server_progress)[i]) &&
826 			    !isspace((unsigned char)(*server_progress)[i])) {
827 				err = got_error(GOT_ERR_PRIVSEP_MSG);
828 				free(*server_progress);
829 				*server_progress = NULL;
830 				goto done;
831 			}
832 		}
833 		break;
834 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
835 		if (datalen < sizeof(*packfile_size)) {
836 			err = got_error(GOT_ERR_PRIVSEP_MSG);
837 			break;
838 		}
839 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
840 		break;
841 	case GOT_IMSG_FETCH_DONE:
842 		if (datalen != SHA1_DIGEST_LENGTH) {
843 			err = got_error(GOT_ERR_PRIVSEP_MSG);
844 			break;
845 		}
846 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
847 		*done = 1;
848 		break;
849 	default:
850 		err = got_error(GOT_ERR_PRIVSEP_MSG);
851 		break;
852 	}
853 done:
854 	if (err) {
855 		free(*id);
856 		*id = NULL;
857 		free(*refname);
858 		*refname = NULL;
859 	}
860 	imsg_free(&imsg);
861 	return err;
862 }
863 
864 static const struct got_error *
865 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
866     int delete, struct imsgbuf *ibuf)
867 {
868 	const struct got_error *err = NULL;
869 	size_t len;
870 	struct ibuf *wbuf;
871 
872 	len = sizeof(struct got_imsg_send_ref) + name_len;
873 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
874 	if (wbuf == NULL)
875 		return got_error_from_errno("imsg_create SEND_REF");
876 
877 	/* Keep in sync with struct got_imsg_send_ref! */
878 	if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1) {
879 		err = got_error_from_errno("imsg_add SEND_REF");
880 		ibuf_free(wbuf);
881 		return err;
882 	}
883 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1) {
884 		err = got_error_from_errno("imsg_add SEND_REF");
885 		ibuf_free(wbuf);
886 		return err;
887 	}
888 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
889 		err = got_error_from_errno("imsg_add SEND_REF");
890 		ibuf_free(wbuf);
891 		return err;
892 	}
893 	if (imsg_add(wbuf, name, name_len) == -1) {
894 		err = got_error_from_errno("imsg_add SEND_REF");
895 		ibuf_free(wbuf);
896 		return err;
897 	}
898 
899 	wbuf->fd = -1;
900 	imsg_close(ibuf, wbuf);
901 	return flush_imsg(ibuf);
902 }
903 
904 const struct got_error *
905 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
906     struct got_pathlist_head *have_refs,
907     struct got_pathlist_head *delete_refs,
908     int verbosity)
909 {
910 	const struct got_error *err = NULL;
911 	struct got_pathlist_entry *pe;
912 	struct got_imsg_send_request sendreq;
913 	struct got_object_id zero_id;
914 
915 	memset(&zero_id, 0, sizeof(zero_id));
916 	memset(&sendreq, 0, sizeof(sendreq));
917 	sendreq.verbosity = verbosity;
918 	TAILQ_FOREACH(pe, have_refs, entry)
919 		sendreq.nrefs++;
920 	TAILQ_FOREACH(pe, delete_refs, entry)
921 		sendreq.nrefs++;
922 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
923 	    &sendreq, sizeof(sendreq)) == -1) {
924 		err = got_error_from_errno(
925 		    "imsg_compose FETCH_SERVER_PROGRESS");
926 		goto done;
927 	}
928 
929 	err = flush_imsg(ibuf);
930 	if (err)
931 		goto done;
932 	fd = -1;
933 
934 	TAILQ_FOREACH(pe, have_refs, entry) {
935 		const char *name = pe->path;
936 		size_t name_len = pe->path_len;
937 		struct got_object_id *id = pe->data;
938 		err = send_send_ref(name, name_len, id, 0, ibuf);
939 		if (err)
940 			goto done;
941 	}
942 
943 	TAILQ_FOREACH(pe, delete_refs, entry) {
944 		const char *name = pe->path;
945 		size_t name_len = pe->path_len;
946 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
947 		if (err)
948 			goto done;
949 	}
950 done:
951 	if (fd != -1 && close(fd) == -1 && err == NULL)
952 		err = got_error_from_errno("close");
953 	return err;
954 
955 }
956 
957 const struct got_error *
958 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
959     struct imsgbuf *ibuf)
960 {
961 	const struct got_error *err = NULL;
962 	struct imsg imsg;
963 	size_t datalen;
964 	int done = 0;
965 	struct got_imsg_send_remote_ref iremote_ref;
966 	struct got_object_id *id = NULL;
967 	char *refname = NULL;
968 	struct got_pathlist_entry *new;
969 
970 	while (!done) {
971 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
972 		if (err)
973 			return err;
974 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
975 		switch (imsg.hdr.type) {
976 		case GOT_IMSG_ERROR:
977 			if (datalen < sizeof(struct got_imsg_error)) {
978 				err = got_error(GOT_ERR_PRIVSEP_LEN);
979 				goto done;
980 			}
981 			err = recv_imsg_error(&imsg, datalen);
982 			goto done;
983 		case GOT_IMSG_SEND_REMOTE_REF:
984 			if (datalen < sizeof(iremote_ref)) {
985 				err = got_error(GOT_ERR_PRIVSEP_MSG);
986 				goto done;
987 			}
988 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
989 			if (datalen != sizeof(iremote_ref) +
990 			    iremote_ref.name_len) {
991 				err = got_error(GOT_ERR_PRIVSEP_MSG);
992 				goto done;
993 			}
994 			id = malloc(sizeof(*id));
995 			if (id == NULL) {
996 				err = got_error_from_errno("malloc");
997 				goto done;
998 			}
999 			memcpy(id->sha1, iremote_ref.id, SHA1_DIGEST_LENGTH);
1000 			refname = strndup(imsg.data + sizeof(iremote_ref),
1001 			    datalen - sizeof(iremote_ref));
1002 			if (refname == NULL) {
1003 				err = got_error_from_errno("strndup");
1004 				goto done;
1005 			}
1006 			err = got_pathlist_insert(&new, remote_refs,
1007 			    refname, id);
1008 			if (err)
1009 				goto done;
1010 			if (new == NULL) { /* duplicate which wasn't inserted */
1011 				free(id);
1012 				free(refname);
1013 			}
1014 			id = NULL;
1015 			refname = NULL;
1016 			break;
1017 		case GOT_IMSG_SEND_PACK_REQUEST:
1018 			if (datalen != 0) {
1019 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1020 				goto done;
1021 			}
1022 			/* got-send-pack is now waiting for a pack file. */
1023 			done = 1;
1024 			break;
1025 		default:
1026 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1027 			break;
1028 		}
1029 	}
1030 done:
1031 	free(id);
1032 	free(refname);
1033 	imsg_free(&imsg);
1034 	return err;
1035 }
1036 
1037 const struct got_error *
1038 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
1039 {
1040 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
1041 }
1042 
1043 const struct got_error *
1044 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
1045     int *success, char **refname, struct imsgbuf *ibuf)
1046 {
1047 	const struct got_error *err = NULL;
1048 	struct imsg imsg;
1049 	size_t datalen;
1050 	struct got_imsg_send_ref_status iref_status;
1051 
1052 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1053 	*done = 0;
1054 	*success = 0;
1055 	*refname = NULL;
1056 
1057 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1058 	if (err)
1059 		return err;
1060 
1061 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1062 	switch (imsg.hdr.type) {
1063 	case GOT_IMSG_ERROR:
1064 		if (datalen < sizeof(struct got_imsg_error)) {
1065 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1066 			break;
1067 		}
1068 		err = recv_imsg_error(&imsg, datalen);
1069 		break;
1070 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1071 		if (datalen < sizeof(*bytes_sent)) {
1072 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1073 			break;
1074 		}
1075 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1076 		break;
1077 	case GOT_IMSG_SEND_REF_STATUS:
1078 		if (datalen < sizeof(iref_status)) {
1079 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1080 			break;
1081 		}
1082 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1083 		if (datalen != sizeof(iref_status) + iref_status.name_len) {
1084 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1085 			break;
1086 		}
1087 		*success = iref_status.success;
1088 		*refname = strndup(imsg.data + sizeof(iref_status),
1089 		    iref_status.name_len);
1090 		break;
1091 	case GOT_IMSG_SEND_DONE:
1092 		if (datalen != 0) {
1093 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1094 			break;
1095 		}
1096 		*done = 1;
1097 		break;
1098 	default:
1099 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1100 		break;
1101 	}
1102 
1103 	imsg_free(&imsg);
1104 	return err;
1105 }
1106 
1107 const struct got_error *
1108 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1109     int fd)
1110 {
1111 	const struct got_error *err = NULL;
1112 
1113 	/* Keep in sync with struct got_imsg_index_pack_request */
1114 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1115 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1116 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1117 		close(fd);
1118 		return err;
1119 	}
1120 	return flush_imsg(ibuf);
1121 }
1122 
1123 const struct got_error *
1124 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1125 {
1126 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1127 }
1128 
1129 const struct got_error *
1130 got_privsep_recv_index_progress(int *done, int *nobj_total,
1131     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1132     struct imsgbuf *ibuf)
1133 {
1134 	const struct got_error *err = NULL;
1135 	struct imsg imsg;
1136 	struct got_imsg_index_pack_progress *iprogress;
1137 	size_t datalen;
1138 
1139 	*done = 0;
1140 	*nobj_total = 0;
1141 	*nobj_indexed = 0;
1142 	*nobj_resolved = 0;
1143 
1144 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1145 	if (err)
1146 		return err;
1147 
1148 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1149 	switch (imsg.hdr.type) {
1150 	case GOT_IMSG_ERROR:
1151 		if (datalen < sizeof(struct got_imsg_error)) {
1152 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1153 			break;
1154 		}
1155 		err = recv_imsg_error(&imsg, datalen);
1156 		break;
1157 	case GOT_IMSG_IDXPACK_PROGRESS:
1158 		if (datalen < sizeof(*iprogress)) {
1159 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1160 			break;
1161 		}
1162 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1163 		*nobj_total = iprogress->nobj_total;
1164 		*nobj_indexed = iprogress->nobj_indexed;
1165 		*nobj_loose = iprogress->nobj_loose;
1166 		*nobj_resolved = iprogress->nobj_resolved;
1167 		break;
1168 	case GOT_IMSG_IDXPACK_DONE:
1169 		if (datalen != 0) {
1170 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1171 			break;
1172 		}
1173 		*done = 1;
1174 		break;
1175 	default:
1176 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1177 		break;
1178 	}
1179 
1180 	imsg_free(&imsg);
1181 	return err;
1182 }
1183 
1184 const struct got_error *
1185 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1186     struct imsgbuf *ibuf)
1187 {
1188 	const struct got_error *err = NULL;
1189 	struct got_imsg_object *iobj;
1190 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1191 
1192 	if (datalen != sizeof(*iobj))
1193 		return got_error(GOT_ERR_PRIVSEP_LEN);
1194 	iobj = imsg->data;
1195 
1196 	*obj = calloc(1, sizeof(**obj));
1197 	if (*obj == NULL)
1198 		return got_error_from_errno("calloc");
1199 
1200 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1201 	(*obj)->type = iobj->type;
1202 	(*obj)->flags = iobj->flags;
1203 	(*obj)->hdrlen = iobj->hdrlen;
1204 	(*obj)->size = iobj->size;
1205 	/* path_packfile is handled by caller */
1206 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1207 		(*obj)->pack_offset = iobj->pack_offset;
1208 		(*obj)->pack_idx = iobj->pack_idx;
1209 	}
1210 
1211 	return err;
1212 }
1213 
1214 const struct got_error *
1215 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1216 {
1217 	const struct got_error *err = NULL;
1218 	struct imsg imsg;
1219 	const size_t min_datalen =
1220 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1221 
1222 	*obj = NULL;
1223 
1224 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1225 	if (err)
1226 		return err;
1227 
1228 	switch (imsg.hdr.type) {
1229 	case GOT_IMSG_OBJECT:
1230 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1231 		break;
1232 	default:
1233 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1234 		break;
1235 	}
1236 
1237 	imsg_free(&imsg);
1238 
1239 	return err;
1240 }
1241 
1242 static const struct got_error *
1243 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1244     size_t logmsg_len)
1245 {
1246 	const struct got_error *err = NULL;
1247 	size_t offset, remain;
1248 
1249 	offset = 0;
1250 	remain = logmsg_len;
1251 	while (remain > 0) {
1252 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1253 
1254 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1255 		    commit->logmsg + offset, n) == -1) {
1256 			err = got_error_from_errno("imsg_compose "
1257 			    "COMMIT_LOGMSG");
1258 			break;
1259 		}
1260 
1261 		err = flush_imsg(ibuf);
1262 		if (err)
1263 			break;
1264 
1265 		offset += n;
1266 		remain -= n;
1267 	}
1268 
1269 	return err;
1270 }
1271 
1272 const struct got_error *
1273 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1274 {
1275 	const struct got_error *err = NULL;
1276 	struct got_imsg_commit_object *icommit;
1277 	uint8_t *buf;
1278 	size_t len, total;
1279 	struct got_object_qid *qid;
1280 	size_t author_len = strlen(commit->author);
1281 	size_t committer_len = strlen(commit->committer);
1282 	size_t logmsg_len = strlen(commit->logmsg);
1283 
1284 	total = sizeof(*icommit) + author_len + committer_len +
1285 	    commit->nparents * SHA1_DIGEST_LENGTH;
1286 
1287 	buf = malloc(total);
1288 	if (buf == NULL)
1289 		return got_error_from_errno("malloc");
1290 
1291 	icommit = (struct got_imsg_commit_object *)buf;
1292 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1293 	    sizeof(icommit->tree_id));
1294 	icommit->author_len = author_len;
1295 	icommit->author_time = commit->author_time;
1296 	icommit->author_gmtoff = commit->author_gmtoff;
1297 	icommit->committer_len = committer_len;
1298 	icommit->committer_time = commit->committer_time;
1299 	icommit->committer_gmtoff = commit->committer_gmtoff;
1300 	icommit->logmsg_len = logmsg_len;
1301 	icommit->nparents = commit->nparents;
1302 
1303 	len = sizeof(*icommit);
1304 	memcpy(buf + len, commit->author, author_len);
1305 	len += author_len;
1306 	memcpy(buf + len, commit->committer, committer_len);
1307 	len += committer_len;
1308 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1309 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
1310 		len += SHA1_DIGEST_LENGTH;
1311 	}
1312 
1313 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1314 		err = got_error_from_errno("imsg_compose COMMIT");
1315 		goto done;
1316 	}
1317 
1318 	if (logmsg_len == 0 ||
1319 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1320 		err = flush_imsg(ibuf);
1321 		if (err)
1322 			goto done;
1323 	}
1324 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1325 done:
1326 	free(buf);
1327 	return err;
1328 }
1329 
1330 static const struct got_error *
1331 get_commit_from_imsg(struct got_commit_object **commit,
1332     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1333 {
1334 	const struct got_error *err = NULL;
1335 	struct got_imsg_commit_object *icommit;
1336 	size_t len = 0;
1337 	int i;
1338 
1339 	if (datalen < sizeof(*icommit))
1340 		return got_error(GOT_ERR_PRIVSEP_LEN);
1341 
1342 	icommit = imsg->data;
1343 	if (datalen != sizeof(*icommit) + icommit->author_len +
1344 	    icommit->committer_len +
1345 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1346 		return got_error(GOT_ERR_PRIVSEP_LEN);
1347 
1348 	if (icommit->nparents < 0)
1349 		return got_error(GOT_ERR_PRIVSEP_LEN);
1350 
1351 	len += sizeof(*icommit);
1352 
1353 	*commit = got_object_commit_alloc_partial();
1354 	if (*commit == NULL)
1355 		return got_error_from_errno(
1356 		    "got_object_commit_alloc_partial");
1357 
1358 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1359 	    SHA1_DIGEST_LENGTH);
1360 	(*commit)->author_time = icommit->author_time;
1361 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1362 	(*commit)->committer_time = icommit->committer_time;
1363 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1364 
1365 	if (icommit->author_len == 0) {
1366 		(*commit)->author = strdup("");
1367 		if ((*commit)->author == NULL) {
1368 			err = got_error_from_errno("strdup");
1369 			goto done;
1370 		}
1371 	} else {
1372 		(*commit)->author = malloc(icommit->author_len + 1);
1373 		if ((*commit)->author == NULL) {
1374 			err = got_error_from_errno("malloc");
1375 			goto done;
1376 		}
1377 		memcpy((*commit)->author, imsg->data + len,
1378 		    icommit->author_len);
1379 		(*commit)->author[icommit->author_len] = '\0';
1380 	}
1381 	len += icommit->author_len;
1382 
1383 	if (icommit->committer_len == 0) {
1384 		(*commit)->committer = strdup("");
1385 		if ((*commit)->committer == NULL) {
1386 			err = got_error_from_errno("strdup");
1387 			goto done;
1388 		}
1389 	} else {
1390 		(*commit)->committer =
1391 		    malloc(icommit->committer_len + 1);
1392 		if ((*commit)->committer == NULL) {
1393 			err = got_error_from_errno("malloc");
1394 			goto done;
1395 		}
1396 		memcpy((*commit)->committer, imsg->data + len,
1397 		    icommit->committer_len);
1398 		(*commit)->committer[icommit->committer_len] = '\0';
1399 	}
1400 	len += icommit->committer_len;
1401 
1402 	if (icommit->logmsg_len == 0) {
1403 		(*commit)->logmsg = strdup("");
1404 		if ((*commit)->logmsg == NULL) {
1405 			err = got_error_from_errno("strdup");
1406 			goto done;
1407 		}
1408 	} else {
1409 		size_t offset = 0, remain = icommit->logmsg_len;
1410 
1411 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1412 		if ((*commit)->logmsg == NULL) {
1413 			err = got_error_from_errno("malloc");
1414 			goto done;
1415 		}
1416 		while (remain > 0) {
1417 			struct imsg imsg_log;
1418 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1419 			    remain);
1420 
1421 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1422 			if (err)
1423 				goto done;
1424 
1425 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1426 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1427 				goto done;
1428 			}
1429 
1430 			memcpy((*commit)->logmsg + offset,
1431 			    imsg_log.data, n);
1432 			imsg_free(&imsg_log);
1433 			offset += n;
1434 			remain -= n;
1435 		}
1436 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1437 	}
1438 
1439 	for (i = 0; i < icommit->nparents; i++) {
1440 		struct got_object_qid *qid;
1441 
1442 		err = got_object_qid_alloc_partial(&qid);
1443 		if (err)
1444 			break;
1445 		memcpy(qid->id, imsg->data + len +
1446 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
1447 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1448 		(*commit)->nparents++;
1449 	}
1450 done:
1451 	if (err) {
1452 		got_object_commit_close(*commit);
1453 		*commit = NULL;
1454 	}
1455 	return err;
1456 }
1457 
1458 const struct got_error *
1459 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1460 {
1461 	const struct got_error *err = NULL;
1462 	struct imsg imsg;
1463 	size_t datalen;
1464 	const size_t min_datalen =
1465 	    MIN(sizeof(struct got_imsg_error),
1466 	    sizeof(struct got_imsg_commit_object));
1467 
1468 	*commit = NULL;
1469 
1470 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1471 	if (err)
1472 		return err;
1473 
1474 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1475 
1476 	switch (imsg.hdr.type) {
1477 	case GOT_IMSG_COMMIT:
1478 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1479 		break;
1480 	default:
1481 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1482 		break;
1483 	}
1484 
1485 	imsg_free(&imsg);
1486 
1487 	return err;
1488 }
1489 
1490 const struct got_error *
1491 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
1492     int nentries)
1493 {
1494 	const struct got_error *err = NULL;
1495 	struct got_imsg_tree_object itree;
1496 	struct got_pathlist_entry *pe;
1497 	size_t totlen;
1498 	int nimsg; /* number of imsg queued in ibuf */
1499 
1500 	itree.nentries = nentries;
1501 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1502 	    == -1)
1503 		return got_error_from_errno("imsg_compose TREE");
1504 
1505 	totlen = sizeof(itree);
1506 	nimsg = 1;
1507 	TAILQ_FOREACH(pe, entries, entry) {
1508 		const char *name = pe->path;
1509 		struct got_parsed_tree_entry *pte = pe->data;
1510 		struct ibuf *wbuf;
1511 		size_t namelen = strlen(name);
1512 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
1513 
1514 		if (len > MAX_IMSGSIZE)
1515 			return got_error(GOT_ERR_NO_SPACE);
1516 
1517 		nimsg++;
1518 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
1519 			err = flush_imsg(ibuf);
1520 			if (err)
1521 				return err;
1522 			nimsg = 0;
1523 		}
1524 
1525 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
1526 		if (wbuf == NULL)
1527 			return got_error_from_errno("imsg_create TREE_ENTRY");
1528 
1529 		/* Keep in sync with struct got_imsg_tree_object definition! */
1530 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
1531 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1532 			ibuf_free(wbuf);
1533 			return err;
1534 		}
1535 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
1536 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1537 			ibuf_free(wbuf);
1538 			return err;
1539 		}
1540 
1541 		if (imsg_add(wbuf, name, namelen) == -1) {
1542 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1543 			ibuf_free(wbuf);
1544 			return err;
1545 		}
1546 
1547 		wbuf->fd = -1;
1548 		imsg_close(ibuf, wbuf);
1549 
1550 		totlen += len;
1551 	}
1552 
1553 	return flush_imsg(ibuf);
1554 }
1555 
1556 const struct got_error *
1557 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1558 {
1559 	const struct got_error *err = NULL;
1560 	const size_t min_datalen =
1561 	    MIN(sizeof(struct got_imsg_error),
1562 	    sizeof(struct got_imsg_tree_object));
1563 	struct got_imsg_tree_object *itree;
1564 	int nentries = 0;
1565 
1566 	*tree = NULL;
1567 get_more:
1568 	err = read_imsg(ibuf);
1569 	if (err)
1570 		goto done;
1571 
1572 	for (;;) {
1573 		struct imsg imsg;
1574 		size_t n;
1575 		size_t datalen;
1576 		struct got_imsg_tree_entry *ite;
1577 		struct got_tree_entry *te = NULL;
1578 
1579 		n = imsg_get(ibuf, &imsg);
1580 		if (n == 0) {
1581 			if (*tree && (*tree)->nentries != nentries)
1582 				goto get_more;
1583 			break;
1584 		}
1585 
1586 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1587 			imsg_free(&imsg);
1588 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1589 			break;
1590 		}
1591 
1592 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1593 
1594 		switch (imsg.hdr.type) {
1595 		case GOT_IMSG_ERROR:
1596 			err = recv_imsg_error(&imsg, datalen);
1597 			break;
1598 		case GOT_IMSG_TREE:
1599 			/* This message should only appear once. */
1600 			if (*tree != NULL) {
1601 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1602 				break;
1603 			}
1604 			if (datalen != sizeof(*itree)) {
1605 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1606 				break;
1607 			}
1608 			itree = imsg.data;
1609 			*tree = malloc(sizeof(**tree));
1610 			if (*tree == NULL) {
1611 				err = got_error_from_errno("malloc");
1612 				break;
1613 			}
1614 			(*tree)->entries = calloc(itree->nentries,
1615 			    sizeof(struct got_tree_entry));
1616 			if ((*tree)->entries == NULL) {
1617 				err = got_error_from_errno("malloc");
1618 				break;
1619 			}
1620 			(*tree)->nentries = itree->nentries;
1621 			(*tree)->refcnt = 0;
1622 			break;
1623 		case GOT_IMSG_TREE_ENTRY:
1624 			/* This message should be preceeded by GOT_IMSG_TREE. */
1625 			if (*tree == NULL) {
1626 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1627 				break;
1628 			}
1629 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
1630 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1631 				break;
1632 			}
1633 
1634 			/* Remaining data contains the entry's name. */
1635 			datalen -= sizeof(*ite);
1636 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
1637 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1638 				break;
1639 			}
1640 			ite = imsg.data;
1641 
1642 			if (datalen + 1 > sizeof(te->name)) {
1643 				err = got_error(GOT_ERR_NO_SPACE);
1644 				break;
1645 			}
1646 			te = &(*tree)->entries[nentries];
1647 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
1648 			te->name[datalen] = '\0';
1649 
1650 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
1651 			te->mode = ite->mode;
1652 			te->idx = nentries;
1653 			nentries++;
1654 			break;
1655 		default:
1656 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1657 			break;
1658 		}
1659 
1660 		imsg_free(&imsg);
1661 		if (err)
1662 			break;
1663 	}
1664 done:
1665 	if (*tree && (*tree)->nentries != nentries) {
1666 		if (err == NULL)
1667 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1668 		got_object_tree_close(*tree);
1669 		*tree = NULL;
1670 	}
1671 
1672 	return err;
1673 }
1674 
1675 const struct got_error *
1676 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1677     const uint8_t *data)
1678 {
1679 	struct got_imsg_blob iblob;
1680 
1681 	iblob.size = size;
1682 	iblob.hdrlen = hdrlen;
1683 
1684 	if (data) {
1685 		uint8_t *buf;
1686 
1687 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1688 			return got_error(GOT_ERR_NO_SPACE);
1689 
1690 		buf = malloc(sizeof(iblob) + size);
1691 		if (buf == NULL)
1692 			return got_error_from_errno("malloc");
1693 
1694 		memcpy(buf, &iblob, sizeof(iblob));
1695 		memcpy(buf + sizeof(iblob), data, size);
1696 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1697 		    sizeof(iblob) + size) == -1) {
1698 			free(buf);
1699 			return got_error_from_errno("imsg_compose BLOB");
1700 		}
1701 		free(buf);
1702 	} else {
1703 		/* Data has already been written to file descriptor. */
1704 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1705 		    sizeof(iblob)) == -1)
1706 			return got_error_from_errno("imsg_compose BLOB");
1707 	}
1708 
1709 
1710 	return flush_imsg(ibuf);
1711 }
1712 
1713 const struct got_error *
1714 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1715     struct imsgbuf *ibuf)
1716 {
1717 	const struct got_error *err = NULL;
1718 	struct imsg imsg;
1719 	struct got_imsg_blob *iblob;
1720 	size_t datalen;
1721 
1722 	*outbuf = NULL;
1723 
1724 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1725 	if (err)
1726 		return err;
1727 
1728 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1729 
1730 	switch (imsg.hdr.type) {
1731 	case GOT_IMSG_BLOB:
1732 		if (datalen < sizeof(*iblob)) {
1733 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1734 			break;
1735 		}
1736 		iblob = imsg.data;
1737 		*size = iblob->size;
1738 		*hdrlen = iblob->hdrlen;
1739 
1740 		if (datalen == sizeof(*iblob)) {
1741 			/* Data has been written to file descriptor. */
1742 			break;
1743 		}
1744 
1745 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1746 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1747 			break;
1748 		}
1749 
1750 		*outbuf = malloc(*size);
1751 		if (*outbuf == NULL) {
1752 			err = got_error_from_errno("malloc");
1753 			break;
1754 		}
1755 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1756 		break;
1757 	default:
1758 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1759 		break;
1760 	}
1761 
1762 	imsg_free(&imsg);
1763 
1764 	return err;
1765 }
1766 
1767 static const struct got_error *
1768 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1769 {
1770 	const struct got_error *err = NULL;
1771 	size_t offset, remain;
1772 
1773 	offset = 0;
1774 	remain = tagmsg_len;
1775 	while (remain > 0) {
1776 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1777 
1778 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1779 		    tag->tagmsg + offset, n) == -1) {
1780 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1781 			break;
1782 		}
1783 
1784 		err = flush_imsg(ibuf);
1785 		if (err)
1786 			break;
1787 
1788 		offset += n;
1789 		remain -= n;
1790 	}
1791 
1792 	return err;
1793 }
1794 
1795 const struct got_error *
1796 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1797 {
1798 	const struct got_error *err = NULL;
1799 	struct got_imsg_tag_object *itag;
1800 	uint8_t *buf;
1801 	size_t len, total;
1802 	size_t tag_len = strlen(tag->tag);
1803 	size_t tagger_len = strlen(tag->tagger);
1804 	size_t tagmsg_len = strlen(tag->tagmsg);
1805 
1806 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1807 
1808 	buf = malloc(total);
1809 	if (buf == NULL)
1810 		return got_error_from_errno("malloc");
1811 
1812 	itag = (struct got_imsg_tag_object *)buf;
1813 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1814 	itag->obj_type = tag->obj_type;
1815 	itag->tag_len = tag_len;
1816 	itag->tagger_len = tagger_len;
1817 	itag->tagger_time = tag->tagger_time;
1818 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1819 	itag->tagmsg_len = tagmsg_len;
1820 
1821 	len = sizeof(*itag);
1822 	memcpy(buf + len, tag->tag, tag_len);
1823 	len += tag_len;
1824 	memcpy(buf + len, tag->tagger, tagger_len);
1825 	len += tagger_len;
1826 
1827 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1828 		err = got_error_from_errno("imsg_compose TAG");
1829 		goto done;
1830 	}
1831 
1832 	if (tagmsg_len == 0 ||
1833 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1834 		err = flush_imsg(ibuf);
1835 		if (err)
1836 			goto done;
1837 	}
1838 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1839 done:
1840 	free(buf);
1841 	return err;
1842 }
1843 
1844 const struct got_error *
1845 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1846 {
1847 	const struct got_error *err = NULL;
1848 	struct imsg imsg;
1849 	struct got_imsg_tag_object *itag;
1850 	size_t len, datalen;
1851 	const size_t min_datalen =
1852 	    MIN(sizeof(struct got_imsg_error),
1853 	    sizeof(struct got_imsg_tag_object));
1854 
1855 	*tag = NULL;
1856 
1857 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1858 	if (err)
1859 		return err;
1860 
1861 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1862 	len = 0;
1863 
1864 	switch (imsg.hdr.type) {
1865 	case GOT_IMSG_TAG:
1866 		if (datalen < sizeof(*itag)) {
1867 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1868 			break;
1869 		}
1870 		itag = imsg.data;
1871 		if (datalen != sizeof(*itag) + itag->tag_len +
1872 		    itag->tagger_len) {
1873 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1874 			break;
1875 		}
1876 		len += sizeof(*itag);
1877 
1878 		*tag = calloc(1, sizeof(**tag));
1879 		if (*tag == NULL) {
1880 			err = got_error_from_errno("calloc");
1881 			break;
1882 		}
1883 
1884 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1885 
1886 		if (itag->tag_len == 0) {
1887 			(*tag)->tag = strdup("");
1888 			if ((*tag)->tag == NULL) {
1889 				err = got_error_from_errno("strdup");
1890 				break;
1891 			}
1892 		} else {
1893 			(*tag)->tag = malloc(itag->tag_len + 1);
1894 			if ((*tag)->tag == NULL) {
1895 				err = got_error_from_errno("malloc");
1896 				break;
1897 			}
1898 			memcpy((*tag)->tag, imsg.data + len,
1899 			    itag->tag_len);
1900 			(*tag)->tag[itag->tag_len] = '\0';
1901 		}
1902 		len += itag->tag_len;
1903 
1904 		(*tag)->obj_type = itag->obj_type;
1905 		(*tag)->tagger_time = itag->tagger_time;
1906 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1907 
1908 		if (itag->tagger_len == 0) {
1909 			(*tag)->tagger = strdup("");
1910 			if ((*tag)->tagger == NULL) {
1911 				err = got_error_from_errno("strdup");
1912 				break;
1913 			}
1914 		} else {
1915 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1916 			if ((*tag)->tagger == NULL) {
1917 				err = got_error_from_errno("malloc");
1918 				break;
1919 			}
1920 			memcpy((*tag)->tagger, imsg.data + len,
1921 			    itag->tagger_len);
1922 			(*tag)->tagger[itag->tagger_len] = '\0';
1923 		}
1924 		len += itag->tagger_len;
1925 
1926 		if (itag->tagmsg_len == 0) {
1927 			(*tag)->tagmsg = strdup("");
1928 			if ((*tag)->tagmsg == NULL) {
1929 				err = got_error_from_errno("strdup");
1930 				break;
1931 			}
1932 		} else {
1933 			size_t offset = 0, remain = itag->tagmsg_len;
1934 
1935 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1936 			if ((*tag)->tagmsg == NULL) {
1937 				err = got_error_from_errno("malloc");
1938 				break;
1939 			}
1940 			while (remain > 0) {
1941 				struct imsg imsg_log;
1942 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1943 				    remain);
1944 
1945 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1946 				if (err)
1947 					return err;
1948 
1949 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1950 					return got_error(GOT_ERR_PRIVSEP_MSG);
1951 
1952 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1953 				    n);
1954 				imsg_free(&imsg_log);
1955 				offset += n;
1956 				remain -= n;
1957 			}
1958 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1959 		}
1960 
1961 		break;
1962 	default:
1963 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1964 		break;
1965 	}
1966 
1967 	imsg_free(&imsg);
1968 
1969 	return err;
1970 }
1971 
1972 const struct got_error *
1973 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1974     struct got_packidx *packidx)
1975 {
1976 	const struct got_error *err = NULL;
1977 	struct got_imsg_packidx ipackidx;
1978 	struct got_imsg_pack ipack;
1979 	int fd;
1980 
1981 	ipackidx.len = packidx->len;
1982 	ipackidx.packfile_size = pack->filesize;
1983 	fd = dup(packidx->fd);
1984 	if (fd == -1)
1985 		return got_error_from_errno("dup");
1986 
1987 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1988 	    sizeof(ipackidx)) == -1) {
1989 		err = got_error_from_errno("imsg_compose PACKIDX");
1990 		close(fd);
1991 		return err;
1992 	}
1993 
1994 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1995 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1996 		return got_error(GOT_ERR_NO_SPACE);
1997 	ipack.filesize = pack->filesize;
1998 
1999 	fd = dup(pack->fd);
2000 	if (fd == -1)
2001 		return got_error_from_errno("dup");
2002 
2003 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
2004 	    == -1) {
2005 		err = got_error_from_errno("imsg_compose PACK");
2006 		close(fd);
2007 		return err;
2008 	}
2009 
2010 	return flush_imsg(ibuf);
2011 }
2012 
2013 const struct got_error *
2014 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
2015     struct got_object_id *id)
2016 {
2017 	struct got_imsg_packed_object iobj;
2018 
2019 	iobj.idx = idx;
2020 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2021 
2022 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2023 	    &iobj, sizeof(iobj)) == -1)
2024 		return got_error_from_errno("imsg_compose "
2025 		    "PACKED_OBJECT_REQUEST");
2026 
2027 	return flush_imsg(ibuf);
2028 }
2029 
2030 const struct got_error *
2031 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2032     struct got_object_id *id)
2033 {
2034 	struct got_imsg_packed_object iobj;
2035 
2036 	iobj.idx = idx;
2037 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2038 
2039 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2040 	    &iobj, sizeof(iobj)) == -1)
2041 		return got_error_from_errno("imsg_compose "
2042 		    "PACKED_OBJECT_REQUEST");
2043 
2044 	return flush_imsg(ibuf);
2045 }
2046 
2047 const struct got_error *
2048 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2049 {
2050 	const struct got_error *err = NULL;
2051 
2052 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2053 	    NULL, 0) == -1) {
2054 		err = got_error_from_errno("imsg_compose "
2055 		    "GITCONFIG_PARSE_REQUEST");
2056 		close(fd);
2057 		return err;
2058 	}
2059 
2060 	return flush_imsg(ibuf);
2061 }
2062 
2063 const struct got_error *
2064 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2065 {
2066 	if (imsg_compose(ibuf,
2067 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2068 	    NULL, 0) == -1)
2069 		return got_error_from_errno("imsg_compose "
2070 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2071 
2072 	return flush_imsg(ibuf);
2073 }
2074 
2075 const struct got_error *
2076 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2077 {
2078 	if (imsg_compose(ibuf,
2079 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2080 	    NULL, 0) == -1)
2081 		return got_error_from_errno("imsg_compose "
2082 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2083 
2084 	return flush_imsg(ibuf);
2085 }
2086 
2087 
2088 const struct got_error *
2089 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2090 {
2091 	if (imsg_compose(ibuf,
2092 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2093 		return got_error_from_errno("imsg_compose "
2094 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2095 
2096 	return flush_imsg(ibuf);
2097 }
2098 
2099 const struct got_error *
2100 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2101 {
2102 	if (imsg_compose(ibuf,
2103 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2104 		return got_error_from_errno("imsg_compose "
2105 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2106 
2107 	return flush_imsg(ibuf);
2108 }
2109 
2110 const struct got_error *
2111 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2112 {
2113 	if (imsg_compose(ibuf,
2114 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2115 		return got_error_from_errno("imsg_compose "
2116 		    "GITCONFIG_REMOTE_REQUEST");
2117 
2118 	return flush_imsg(ibuf);
2119 }
2120 
2121 const struct got_error *
2122 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2123 {
2124 	if (imsg_compose(ibuf,
2125 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2126 		return got_error_from_errno("imsg_compose "
2127 		    "GITCONFIG_OWNER_REQUEST");
2128 
2129 	return flush_imsg(ibuf);
2130 }
2131 
2132 const struct got_error *
2133 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2134 {
2135 	const struct got_error *err = NULL;
2136 	struct imsg imsg;
2137 	size_t datalen;
2138 	const size_t min_datalen = 0;
2139 
2140 	*str = NULL;
2141 
2142 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2143 	if (err)
2144 		return err;
2145 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2146 
2147 	switch (imsg.hdr.type) {
2148 	case GOT_IMSG_GITCONFIG_STR_VAL:
2149 		if (datalen == 0)
2150 			break;
2151 		/* datalen does not include terminating \0 */
2152 		*str = malloc(datalen + 1);
2153 		if (*str == NULL) {
2154 			err = got_error_from_errno("malloc");
2155 			break;
2156 		}
2157 		memcpy(*str, imsg.data, datalen);
2158 		(*str)[datalen] = '\0';
2159 		break;
2160 	default:
2161 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2162 		break;
2163 	}
2164 
2165 	imsg_free(&imsg);
2166 	return err;
2167 }
2168 
2169 const struct got_error *
2170 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2171 {
2172 	const struct got_error *err = NULL;
2173 	struct imsg imsg;
2174 	size_t datalen;
2175 	const size_t min_datalen =
2176 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2177 
2178 	*val = 0;
2179 
2180 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2181 	if (err)
2182 		return err;
2183 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2184 
2185 	switch (imsg.hdr.type) {
2186 	case GOT_IMSG_GITCONFIG_INT_VAL:
2187 		if (datalen != sizeof(*val)) {
2188 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2189 			break;
2190 		}
2191 		memcpy(val, imsg.data, sizeof(*val));
2192 		break;
2193 	default:
2194 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2195 		break;
2196 	}
2197 
2198 	imsg_free(&imsg);
2199 	return err;
2200 }
2201 
2202 static void
2203 free_remote_data(struct got_remote_repo *remote)
2204 {
2205 	int i;
2206 
2207 	free(remote->name);
2208 	free(remote->fetch_url);
2209 	free(remote->send_url);
2210 	for (i = 0; i < remote->nfetch_branches; i++)
2211 		free(remote->fetch_branches[i]);
2212 	free(remote->fetch_branches);
2213 	for (i = 0; i < remote->nsend_branches; i++)
2214 		free(remote->send_branches[i]);
2215 	free(remote->send_branches);
2216 	for (i = 0; i < remote->nfetch_refs; i++)
2217 		free(remote->fetch_refs[i]);
2218 	free(remote->fetch_refs);
2219 }
2220 
2221 const struct got_error *
2222 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2223     int *nremotes, struct imsgbuf *ibuf)
2224 {
2225 	const struct got_error *err = NULL;
2226 	struct imsg imsg;
2227 	size_t datalen;
2228 	struct got_imsg_remotes iremotes;
2229 	struct got_imsg_remote iremote;
2230 
2231 	*remotes = NULL;
2232 	*nremotes = 0;
2233 	iremotes.nremotes = 0;
2234 
2235 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2236 	if (err)
2237 		return err;
2238 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2239 
2240 	switch (imsg.hdr.type) {
2241 	case GOT_IMSG_GITCONFIG_REMOTES:
2242 		if (datalen != sizeof(iremotes)) {
2243 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2244 			break;
2245 		}
2246 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2247 		if (iremotes.nremotes == 0) {
2248 			imsg_free(&imsg);
2249 			return NULL;
2250 		}
2251 		break;
2252 	default:
2253 		imsg_free(&imsg);
2254 		return got_error(GOT_ERR_PRIVSEP_MSG);
2255 	}
2256 
2257 	imsg_free(&imsg);
2258 
2259 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2260 	if (*remotes == NULL)
2261 		return got_error_from_errno("recallocarray");
2262 
2263 	while (*nremotes < iremotes.nremotes) {
2264 		struct got_remote_repo *remote;
2265 
2266 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2267 		if (err)
2268 			break;
2269 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2270 
2271 		switch (imsg.hdr.type) {
2272 		case GOT_IMSG_GITCONFIG_REMOTE:
2273 			remote = &(*remotes)[*nremotes];
2274 			memset(remote, 0, sizeof(*remote));
2275 			if (datalen < sizeof(iremote)) {
2276 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2277 				break;
2278 			}
2279 			memcpy(&iremote, imsg.data, sizeof(iremote));
2280 			if (iremote.name_len == 0 ||
2281 			    iremote.fetch_url_len == 0 ||
2282 			    iremote.send_url_len == 0 ||
2283 			    (sizeof(iremote) + iremote.name_len +
2284 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2285 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2286 				break;
2287 			}
2288 			remote->name = strndup(imsg.data + sizeof(iremote),
2289 			    iremote.name_len);
2290 			if (remote->name == NULL) {
2291 				err = got_error_from_errno("strndup");
2292 				break;
2293 			}
2294 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2295 			    iremote.name_len, iremote.fetch_url_len);
2296 			if (remote->fetch_url == NULL) {
2297 				err = got_error_from_errno("strndup");
2298 				free_remote_data(remote);
2299 				break;
2300 			}
2301 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2302 			    iremote.name_len + iremote.fetch_url_len,
2303 			    iremote.send_url_len);
2304 			if (remote->send_url == NULL) {
2305 				err = got_error_from_errno("strndup");
2306 				free_remote_data(remote);
2307 				break;
2308 			}
2309 			remote->mirror_references = iremote.mirror_references;
2310 			remote->fetch_all_branches = iremote.fetch_all_branches;
2311 			remote->nfetch_branches = 0;
2312 			remote->fetch_branches = NULL;
2313 			remote->nsend_branches = 0;
2314 			remote->send_branches = NULL;
2315 			remote->nfetch_refs = 0;
2316 			remote->fetch_refs = NULL;
2317 			(*nremotes)++;
2318 			break;
2319 		default:
2320 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2321 			break;
2322 		}
2323 
2324 		imsg_free(&imsg);
2325 		if (err)
2326 			break;
2327 	}
2328 
2329 	if (err) {
2330 		int i;
2331 		for (i = 0; i < *nremotes; i++)
2332 			free_remote_data(&(*remotes)[i]);
2333 		free(*remotes);
2334 		*remotes = NULL;
2335 		*nremotes = 0;
2336 	}
2337 	return err;
2338 }
2339 
2340 const struct got_error *
2341 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2342 {
2343 	const struct got_error *err = NULL;
2344 
2345 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2346 	    NULL, 0) == -1) {
2347 		err = got_error_from_errno("imsg_compose "
2348 		    "GOTCONFIG_PARSE_REQUEST");
2349 		close(fd);
2350 		return err;
2351 	}
2352 
2353 	return flush_imsg(ibuf);
2354 }
2355 
2356 const struct got_error *
2357 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2358 {
2359 	if (imsg_compose(ibuf,
2360 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2361 		return got_error_from_errno("imsg_compose "
2362 		    "GOTCONFIG_AUTHOR_REQUEST");
2363 
2364 	return flush_imsg(ibuf);
2365 }
2366 
2367 const struct got_error *
2368 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2369 {
2370 	if (imsg_compose(ibuf,
2371 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2372 		return got_error_from_errno("imsg_compose "
2373 		    "GOTCONFIG_REMOTE_REQUEST");
2374 
2375 	return flush_imsg(ibuf);
2376 }
2377 
2378 const struct got_error *
2379 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2380 {
2381 	const struct got_error *err = NULL;
2382 	struct imsg imsg;
2383 	size_t datalen;
2384 	const size_t min_datalen = 0;
2385 
2386 	*str = NULL;
2387 
2388 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2389 	if (err)
2390 		return err;
2391 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2392 
2393 	switch (imsg.hdr.type) {
2394 	case GOT_IMSG_ERROR:
2395 		if (datalen < sizeof(struct got_imsg_error)) {
2396 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2397 			break;
2398 		}
2399 		err = recv_imsg_error(&imsg, datalen);
2400 		break;
2401 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2402 		if (datalen == 0)
2403 			break;
2404 		/* datalen does not include terminating \0 */
2405 		*str = malloc(datalen + 1);
2406 		if (*str == NULL) {
2407 			err = got_error_from_errno("malloc");
2408 			break;
2409 		}
2410 		memcpy(*str, imsg.data, datalen);
2411 		(*str)[datalen] = '\0';
2412 		break;
2413 	default:
2414 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2415 		break;
2416 	}
2417 
2418 	imsg_free(&imsg);
2419 	return err;
2420 }
2421 
2422 const struct got_error *
2423 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2424     int *nremotes, struct imsgbuf *ibuf)
2425 {
2426 	const struct got_error *err = NULL;
2427 	struct imsg imsg;
2428 	size_t datalen;
2429 	struct got_imsg_remotes iremotes;
2430 	struct got_imsg_remote iremote;
2431 	const size_t min_datalen =
2432 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2433 
2434 	*remotes = NULL;
2435 	*nremotes = 0;
2436 	iremotes.nremotes = 0;
2437 
2438 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2439 	if (err)
2440 		return err;
2441 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2442 
2443 	switch (imsg.hdr.type) {
2444 	case GOT_IMSG_ERROR:
2445 		if (datalen < sizeof(struct got_imsg_error)) {
2446 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2447 			break;
2448 		}
2449 		err = recv_imsg_error(&imsg, datalen);
2450 		break;
2451 	case GOT_IMSG_GOTCONFIG_REMOTES:
2452 		if (datalen != sizeof(iremotes)) {
2453 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2454 			break;
2455 		}
2456 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2457 		if (iremotes.nremotes == 0) {
2458 			imsg_free(&imsg);
2459 			return NULL;
2460 		}
2461 		break;
2462 	default:
2463 		imsg_free(&imsg);
2464 		return got_error(GOT_ERR_PRIVSEP_MSG);
2465 	}
2466 
2467 	imsg_free(&imsg);
2468 
2469 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2470 	if (*remotes == NULL)
2471 		return got_error_from_errno("recallocarray");
2472 
2473 	while (*nremotes < iremotes.nremotes) {
2474 		struct got_remote_repo *remote;
2475 		const size_t min_datalen =
2476 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2477 		int i;
2478 
2479 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2480 		if (err)
2481 			break;
2482 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2483 
2484 		switch (imsg.hdr.type) {
2485 		case GOT_IMSG_ERROR:
2486 			if (datalen < sizeof(struct got_imsg_error)) {
2487 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2488 				break;
2489 			}
2490 			err = recv_imsg_error(&imsg, datalen);
2491 			break;
2492 		case GOT_IMSG_GOTCONFIG_REMOTE:
2493 			remote = &(*remotes)[*nremotes];
2494 			memset(remote, 0, sizeof(*remote));
2495 			if (datalen < sizeof(iremote)) {
2496 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2497 				break;
2498 			}
2499 			memcpy(&iremote, imsg.data, sizeof(iremote));
2500 			if (iremote.name_len == 0 ||
2501 			    (iremote.fetch_url_len == 0 &&
2502 			    iremote.send_url_len == 0) ||
2503 			    (sizeof(iremote) + iremote.name_len +
2504 			    iremote.fetch_url_len + iremote.send_url_len) >
2505 			    datalen) {
2506 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2507 				break;
2508 			}
2509 			remote->name = strndup(imsg.data + sizeof(iremote),
2510 			    iremote.name_len);
2511 			if (remote->name == NULL) {
2512 				err = got_error_from_errno("strndup");
2513 				break;
2514 			}
2515 			remote->fetch_url = strndup(imsg.data +
2516 			    sizeof(iremote) + iremote.name_len,
2517 			    iremote.fetch_url_len);
2518 			if (remote->fetch_url == NULL) {
2519 				err = got_error_from_errno("strndup");
2520 				free_remote_data(remote);
2521 				break;
2522 			}
2523 			remote->send_url = strndup(imsg.data +
2524 			    sizeof(iremote) + iremote.name_len +
2525 			    iremote.fetch_url_len, iremote.send_url_len);
2526 			if (remote->send_url == NULL) {
2527 				err = got_error_from_errno("strndup");
2528 				free_remote_data(remote);
2529 				break;
2530 			}
2531 			remote->mirror_references = iremote.mirror_references;
2532 			remote->fetch_all_branches = iremote.fetch_all_branches;
2533 			if (iremote.nfetch_branches > 0) {
2534 				remote->fetch_branches = recallocarray(NULL, 0,
2535 				    iremote.nfetch_branches, sizeof(char *));
2536 				if (remote->fetch_branches == NULL) {
2537 					err = got_error_from_errno("calloc");
2538 					free_remote_data(remote);
2539 					break;
2540 				}
2541 			}
2542 			remote->nfetch_branches = 0;
2543 			for (i = 0; i < iremote.nfetch_branches; i++) {
2544 				char *branch;
2545 				err = got_privsep_recv_gotconfig_str(&branch,
2546 				    ibuf);
2547 				if (err) {
2548 					free_remote_data(remote);
2549 					goto done;
2550 				}
2551 				remote->fetch_branches[i] = branch;
2552 				remote->nfetch_branches++;
2553 			}
2554 			if (iremote.nsend_branches > 0) {
2555 				remote->send_branches = recallocarray(NULL, 0,
2556 				    iremote.nsend_branches, sizeof(char *));
2557 				if (remote->send_branches == NULL) {
2558 					err = got_error_from_errno("calloc");
2559 					free_remote_data(remote);
2560 					break;
2561 				}
2562 			}
2563 			remote->nsend_branches = 0;
2564 			for (i = 0; i < iremote.nsend_branches; i++) {
2565 				char *branch;
2566 				err = got_privsep_recv_gotconfig_str(&branch,
2567 				    ibuf);
2568 				if (err) {
2569 					free_remote_data(remote);
2570 					goto done;
2571 				}
2572 				remote->send_branches[i] = branch;
2573 				remote->nsend_branches++;
2574 			}
2575 			if (iremote.nfetch_refs > 0) {
2576 				remote->fetch_refs = recallocarray(NULL, 0,
2577 				    iremote.nfetch_refs, sizeof(char *));
2578 				if (remote->fetch_refs == NULL) {
2579 					err = got_error_from_errno("calloc");
2580 					free_remote_data(remote);
2581 					break;
2582 				}
2583 			}
2584 			remote->nfetch_refs = 0;
2585 			for (i = 0; i < iremote.nfetch_refs; i++) {
2586 				char *ref;
2587 				err = got_privsep_recv_gotconfig_str(&ref,
2588 				    ibuf);
2589 				if (err) {
2590 					free_remote_data(remote);
2591 					goto done;
2592 				}
2593 				remote->fetch_refs[i] = ref;
2594 				remote->nfetch_refs++;
2595 			}
2596 			(*nremotes)++;
2597 			break;
2598 		default:
2599 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2600 			break;
2601 		}
2602 
2603 		imsg_free(&imsg);
2604 		if (err)
2605 			break;
2606 	}
2607 done:
2608 	if (err) {
2609 		int i;
2610 		for (i = 0; i < *nremotes; i++)
2611 			free_remote_data(&(*remotes)[i]);
2612 		free(*remotes);
2613 		*remotes = NULL;
2614 		*nremotes = 0;
2615 	}
2616 	return err;
2617 }
2618 
2619 const struct got_error *
2620 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2621     struct got_object_id *id, int idx, const char *path)
2622 {
2623 	const struct got_error *err = NULL;
2624 	struct ibuf *wbuf;
2625 	size_t path_len = strlen(path) + 1;
2626 
2627 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2628 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2629 	if (wbuf == NULL)
2630 		return got_error_from_errno(
2631 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2632 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2633 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2634 		ibuf_free(wbuf);
2635 		return err;
2636 	}
2637 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
2638 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2639 		ibuf_free(wbuf);
2640 		return err;
2641 	}
2642 	if (imsg_add(wbuf, path, path_len) == -1) {
2643 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2644 		ibuf_free(wbuf);
2645 		return err;
2646 	}
2647 
2648 	wbuf->fd = -1;
2649 	imsg_close(ibuf, wbuf);
2650 
2651 	return flush_imsg(ibuf);
2652 }
2653 
2654 const struct got_error *
2655 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2656     struct got_object_id **changed_commit_id,
2657     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2658 {
2659 	const struct got_error *err = NULL;
2660 	struct imsg imsg;
2661 	struct got_imsg_traversed_commits *icommits;
2662 	size_t datalen;
2663 	int i, done = 0;
2664 
2665 	*changed_commit = NULL;
2666 	*changed_commit_id = NULL;
2667 
2668 	while (!done) {
2669 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2670 		if (err)
2671 			return err;
2672 
2673 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2674 		switch (imsg.hdr.type) {
2675 		case GOT_IMSG_TRAVERSED_COMMITS:
2676 			icommits = imsg.data;
2677 			if (datalen != sizeof(*icommits) +
2678 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2679 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2680 				break;
2681 			}
2682 			for (i = 0; i < icommits->ncommits; i++) {
2683 				struct got_object_qid *qid;
2684 				uint8_t *sha1 = (uint8_t *)imsg.data +
2685 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2686 				err = got_object_qid_alloc_partial(&qid);
2687 				if (err)
2688 					break;
2689 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
2690 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2691 
2692 				/* The last commit may contain a change. */
2693 				if (i == icommits->ncommits - 1) {
2694 					*changed_commit_id =
2695 					    got_object_id_dup(qid->id);
2696 					if (*changed_commit_id == NULL) {
2697 						err = got_error_from_errno(
2698 						    "got_object_id_dup");
2699 						break;
2700 					}
2701 				}
2702 			}
2703 			break;
2704 		case GOT_IMSG_COMMIT:
2705 			if (*changed_commit_id == NULL) {
2706 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2707 				break;
2708 			}
2709 			err = get_commit_from_imsg(changed_commit, &imsg,
2710 			    datalen, ibuf);
2711 			break;
2712 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2713 			done = 1;
2714 			break;
2715 		default:
2716 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2717 			break;
2718 		}
2719 
2720 		imsg_free(&imsg);
2721 		if (err)
2722 			break;
2723 	}
2724 
2725 	if (err)
2726 		got_object_id_queue_free(commit_ids);
2727 	return err;
2728 }
2729 
2730 const struct got_error *
2731 got_privsep_unveil_exec_helpers(void)
2732 {
2733 	const char *helpers[] = {
2734 	    GOT_PATH_PROG_READ_PACK,
2735 	    GOT_PATH_PROG_READ_OBJECT,
2736 	    GOT_PATH_PROG_READ_COMMIT,
2737 	    GOT_PATH_PROG_READ_TREE,
2738 	    GOT_PATH_PROG_READ_BLOB,
2739 	    GOT_PATH_PROG_READ_TAG,
2740 	    GOT_PATH_PROG_READ_GITCONFIG,
2741 	    GOT_PATH_PROG_READ_GOTCONFIG,
2742 	    GOT_PATH_PROG_FETCH_PACK,
2743 	    GOT_PATH_PROG_INDEX_PACK,
2744 	    GOT_PATH_PROG_SEND_PACK,
2745 	};
2746 	size_t i;
2747 
2748 	for (i = 0; i < nitems(helpers); i++) {
2749 		if (unveil(helpers[i], "x") == 0)
2750 			continue;
2751 		return got_error_from_errno2("unveil", helpers[i]);
2752 	}
2753 
2754 	return NULL;
2755 }
2756 
2757 void
2758 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
2759 {
2760 	if (close(imsg_fds[0]) == -1) {
2761 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2762 		_exit(1);
2763 	}
2764 
2765 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
2766 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2767 		_exit(1);
2768 	}
2769 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
2770 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2771 		_exit(1);
2772 	}
2773 
2774 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
2775 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
2776 		    strerror(errno));
2777 		_exit(1);
2778 	}
2779 }