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_REQUEST");
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_REQUEST");
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 	struct got_imsg_object *iobj;
1189 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1190 
1191 	if (datalen != sizeof(*iobj))
1192 		return got_error(GOT_ERR_PRIVSEP_LEN);
1193 	iobj = imsg->data;
1194 
1195 	*obj = calloc(1, sizeof(**obj));
1196 	if (*obj == NULL)
1197 		return got_error_from_errno("calloc");
1198 
1199 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1200 	(*obj)->type = iobj->type;
1201 	(*obj)->flags = iobj->flags;
1202 	(*obj)->hdrlen = iobj->hdrlen;
1203 	(*obj)->size = iobj->size;
1204 	/* path_packfile is handled by caller */
1205 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1206 		(*obj)->pack_offset = iobj->pack_offset;
1207 		(*obj)->pack_idx = iobj->pack_idx;
1208 	}
1209 	STAILQ_INIT(&(*obj)->deltas.entries);
1210 	return NULL;
1211 }
1212 
1213 const struct got_error *
1214 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1215 {
1216 	const struct got_error *err = NULL;
1217 	struct imsg imsg;
1218 	const size_t min_datalen =
1219 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1220 
1221 	*obj = NULL;
1222 
1223 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1224 	if (err)
1225 		return err;
1226 
1227 	switch (imsg.hdr.type) {
1228 	case GOT_IMSG_OBJECT:
1229 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1230 		break;
1231 	default:
1232 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1233 		break;
1234 	}
1235 
1236 	imsg_free(&imsg);
1237 
1238 	return err;
1239 }
1240 
1241 static const struct got_error *
1242 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1243     size_t logmsg_len)
1244 {
1245 	const struct got_error *err = NULL;
1246 	size_t offset, remain;
1247 
1248 	offset = 0;
1249 	remain = logmsg_len;
1250 	while (remain > 0) {
1251 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1252 
1253 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1254 		    commit->logmsg + offset, n) == -1) {
1255 			err = got_error_from_errno("imsg_compose "
1256 			    "COMMIT_LOGMSG");
1257 			break;
1258 		}
1259 
1260 		err = flush_imsg(ibuf);
1261 		if (err)
1262 			break;
1263 
1264 		offset += n;
1265 		remain -= n;
1266 	}
1267 
1268 	return err;
1269 }
1270 
1271 const struct got_error *
1272 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1273 {
1274 	const struct got_error *err = NULL;
1275 	struct got_imsg_commit_object *icommit;
1276 	uint8_t *buf;
1277 	size_t len, total;
1278 	struct got_object_qid *qid;
1279 	size_t author_len = strlen(commit->author);
1280 	size_t committer_len = strlen(commit->committer);
1281 	size_t logmsg_len = strlen(commit->logmsg);
1282 
1283 	total = sizeof(*icommit) + author_len + committer_len +
1284 	    commit->nparents * SHA1_DIGEST_LENGTH;
1285 
1286 	buf = malloc(total);
1287 	if (buf == NULL)
1288 		return got_error_from_errno("malloc");
1289 
1290 	icommit = (struct got_imsg_commit_object *)buf;
1291 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1292 	    sizeof(icommit->tree_id));
1293 	icommit->author_len = author_len;
1294 	icommit->author_time = commit->author_time;
1295 	icommit->author_gmtoff = commit->author_gmtoff;
1296 	icommit->committer_len = committer_len;
1297 	icommit->committer_time = commit->committer_time;
1298 	icommit->committer_gmtoff = commit->committer_gmtoff;
1299 	icommit->logmsg_len = logmsg_len;
1300 	icommit->nparents = commit->nparents;
1301 
1302 	len = sizeof(*icommit);
1303 	memcpy(buf + len, commit->author, author_len);
1304 	len += author_len;
1305 	memcpy(buf + len, commit->committer, committer_len);
1306 	len += committer_len;
1307 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1308 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
1309 		len += SHA1_DIGEST_LENGTH;
1310 	}
1311 
1312 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1313 		err = got_error_from_errno("imsg_compose COMMIT");
1314 		goto done;
1315 	}
1316 
1317 	if (logmsg_len == 0 ||
1318 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1319 		err = flush_imsg(ibuf);
1320 		if (err)
1321 			goto done;
1322 	}
1323 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1324 done:
1325 	free(buf);
1326 	return err;
1327 }
1328 
1329 static const struct got_error *
1330 get_commit_from_imsg(struct got_commit_object **commit,
1331     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1332 {
1333 	const struct got_error *err = NULL;
1334 	struct got_imsg_commit_object *icommit;
1335 	size_t len = 0;
1336 	int i;
1337 
1338 	if (datalen < sizeof(*icommit))
1339 		return got_error(GOT_ERR_PRIVSEP_LEN);
1340 
1341 	icommit = imsg->data;
1342 	if (datalen != sizeof(*icommit) + icommit->author_len +
1343 	    icommit->committer_len +
1344 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1345 		return got_error(GOT_ERR_PRIVSEP_LEN);
1346 
1347 	if (icommit->nparents < 0)
1348 		return got_error(GOT_ERR_PRIVSEP_LEN);
1349 
1350 	len += sizeof(*icommit);
1351 
1352 	*commit = got_object_commit_alloc_partial();
1353 	if (*commit == NULL)
1354 		return got_error_from_errno(
1355 		    "got_object_commit_alloc_partial");
1356 
1357 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1358 	    SHA1_DIGEST_LENGTH);
1359 	(*commit)->author_time = icommit->author_time;
1360 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1361 	(*commit)->committer_time = icommit->committer_time;
1362 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1363 
1364 	if (icommit->author_len == 0) {
1365 		(*commit)->author = strdup("");
1366 		if ((*commit)->author == NULL) {
1367 			err = got_error_from_errno("strdup");
1368 			goto done;
1369 		}
1370 	} else {
1371 		(*commit)->author = malloc(icommit->author_len + 1);
1372 		if ((*commit)->author == NULL) {
1373 			err = got_error_from_errno("malloc");
1374 			goto done;
1375 		}
1376 		memcpy((*commit)->author, imsg->data + len,
1377 		    icommit->author_len);
1378 		(*commit)->author[icommit->author_len] = '\0';
1379 	}
1380 	len += icommit->author_len;
1381 
1382 	if (icommit->committer_len == 0) {
1383 		(*commit)->committer = strdup("");
1384 		if ((*commit)->committer == NULL) {
1385 			err = got_error_from_errno("strdup");
1386 			goto done;
1387 		}
1388 	} else {
1389 		(*commit)->committer =
1390 		    malloc(icommit->committer_len + 1);
1391 		if ((*commit)->committer == NULL) {
1392 			err = got_error_from_errno("malloc");
1393 			goto done;
1394 		}
1395 		memcpy((*commit)->committer, imsg->data + len,
1396 		    icommit->committer_len);
1397 		(*commit)->committer[icommit->committer_len] = '\0';
1398 	}
1399 	len += icommit->committer_len;
1400 
1401 	if (icommit->logmsg_len == 0) {
1402 		(*commit)->logmsg = strdup("");
1403 		if ((*commit)->logmsg == NULL) {
1404 			err = got_error_from_errno("strdup");
1405 			goto done;
1406 		}
1407 	} else {
1408 		size_t offset = 0, remain = icommit->logmsg_len;
1409 
1410 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1411 		if ((*commit)->logmsg == NULL) {
1412 			err = got_error_from_errno("malloc");
1413 			goto done;
1414 		}
1415 		while (remain > 0) {
1416 			struct imsg imsg_log;
1417 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1418 			    remain);
1419 
1420 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1421 			if (err)
1422 				goto done;
1423 
1424 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1425 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1426 				goto done;
1427 			}
1428 
1429 			memcpy((*commit)->logmsg + offset,
1430 			    imsg_log.data, n);
1431 			imsg_free(&imsg_log);
1432 			offset += n;
1433 			remain -= n;
1434 		}
1435 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1436 	}
1437 
1438 	for (i = 0; i < icommit->nparents; i++) {
1439 		struct got_object_qid *qid;
1440 
1441 		err = got_object_qid_alloc_partial(&qid);
1442 		if (err)
1443 			break;
1444 		memcpy(qid->id, imsg->data + len +
1445 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
1446 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1447 		(*commit)->nparents++;
1448 	}
1449 done:
1450 	if (err) {
1451 		got_object_commit_close(*commit);
1452 		*commit = NULL;
1453 	}
1454 	return err;
1455 }
1456 
1457 const struct got_error *
1458 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1459 {
1460 	const struct got_error *err = NULL;
1461 	struct imsg imsg;
1462 	size_t datalen;
1463 	const size_t min_datalen =
1464 	    MIN(sizeof(struct got_imsg_error),
1465 	    sizeof(struct got_imsg_commit_object));
1466 
1467 	*commit = NULL;
1468 
1469 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1470 	if (err)
1471 		return err;
1472 
1473 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1474 
1475 	switch (imsg.hdr.type) {
1476 	case GOT_IMSG_COMMIT:
1477 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1478 		break;
1479 	default:
1480 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1481 		break;
1482 	}
1483 
1484 	imsg_free(&imsg);
1485 
1486 	return err;
1487 }
1488 
1489 const struct got_error *
1490 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
1491     int nentries)
1492 {
1493 	const struct got_error *err = NULL;
1494 	struct got_imsg_tree_object itree;
1495 	struct got_pathlist_entry *pe;
1496 	size_t totlen;
1497 	int nimsg; /* number of imsg queued in ibuf */
1498 
1499 	itree.nentries = nentries;
1500 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1501 	    == -1)
1502 		return got_error_from_errno("imsg_compose TREE");
1503 
1504 	totlen = sizeof(itree);
1505 	nimsg = 1;
1506 	TAILQ_FOREACH(pe, entries, entry) {
1507 		const char *name = pe->path;
1508 		struct got_parsed_tree_entry *pte = pe->data;
1509 		struct ibuf *wbuf;
1510 		size_t namelen = strlen(name);
1511 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
1512 
1513 		if (len > MAX_IMSGSIZE)
1514 			return got_error(GOT_ERR_NO_SPACE);
1515 
1516 		nimsg++;
1517 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
1518 			err = flush_imsg(ibuf);
1519 			if (err)
1520 				return err;
1521 			nimsg = 0;
1522 		}
1523 
1524 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
1525 		if (wbuf == NULL)
1526 			return got_error_from_errno("imsg_create TREE_ENTRY");
1527 
1528 		/* Keep in sync with struct got_imsg_tree_object definition! */
1529 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
1530 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1531 			ibuf_free(wbuf);
1532 			return err;
1533 		}
1534 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
1535 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1536 			ibuf_free(wbuf);
1537 			return err;
1538 		}
1539 
1540 		if (imsg_add(wbuf, name, namelen) == -1) {
1541 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1542 			ibuf_free(wbuf);
1543 			return err;
1544 		}
1545 
1546 		wbuf->fd = -1;
1547 		imsg_close(ibuf, wbuf);
1548 
1549 		totlen += len;
1550 	}
1551 
1552 	return flush_imsg(ibuf);
1553 }
1554 
1555 const struct got_error *
1556 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1557 {
1558 	const struct got_error *err = NULL;
1559 	const size_t min_datalen =
1560 	    MIN(sizeof(struct got_imsg_error),
1561 	    sizeof(struct got_imsg_tree_object));
1562 	struct got_imsg_tree_object *itree;
1563 	int nentries = 0;
1564 
1565 	*tree = NULL;
1566 get_more:
1567 	err = read_imsg(ibuf);
1568 	if (err)
1569 		goto done;
1570 
1571 	for (;;) {
1572 		struct imsg imsg;
1573 		size_t n;
1574 		size_t datalen;
1575 		struct got_imsg_tree_entry *ite;
1576 		struct got_tree_entry *te = NULL;
1577 
1578 		n = imsg_get(ibuf, &imsg);
1579 		if (n == 0) {
1580 			if (*tree && (*tree)->nentries != nentries)
1581 				goto get_more;
1582 			break;
1583 		}
1584 
1585 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1586 			imsg_free(&imsg);
1587 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1588 			break;
1589 		}
1590 
1591 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1592 
1593 		switch (imsg.hdr.type) {
1594 		case GOT_IMSG_ERROR:
1595 			err = recv_imsg_error(&imsg, datalen);
1596 			break;
1597 		case GOT_IMSG_TREE:
1598 			/* This message should only appear once. */
1599 			if (*tree != NULL) {
1600 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1601 				break;
1602 			}
1603 			if (datalen != sizeof(*itree)) {
1604 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1605 				break;
1606 			}
1607 			itree = imsg.data;
1608 			*tree = malloc(sizeof(**tree));
1609 			if (*tree == NULL) {
1610 				err = got_error_from_errno("malloc");
1611 				break;
1612 			}
1613 			(*tree)->entries = calloc(itree->nentries,
1614 			    sizeof(struct got_tree_entry));
1615 			if ((*tree)->entries == NULL) {
1616 				err = got_error_from_errno("malloc");
1617 				break;
1618 			}
1619 			(*tree)->nentries = itree->nentries;
1620 			(*tree)->refcnt = 0;
1621 			break;
1622 		case GOT_IMSG_TREE_ENTRY:
1623 			/* This message should be preceeded by GOT_IMSG_TREE. */
1624 			if (*tree == NULL) {
1625 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1626 				break;
1627 			}
1628 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
1629 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1630 				break;
1631 			}
1632 
1633 			/* Remaining data contains the entry's name. */
1634 			datalen -= sizeof(*ite);
1635 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
1636 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1637 				break;
1638 			}
1639 			ite = imsg.data;
1640 
1641 			if (datalen + 1 > sizeof(te->name)) {
1642 				err = got_error(GOT_ERR_NO_SPACE);
1643 				break;
1644 			}
1645 			te = &(*tree)->entries[nentries];
1646 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
1647 			te->name[datalen] = '\0';
1648 
1649 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
1650 			te->mode = ite->mode;
1651 			te->idx = nentries;
1652 			nentries++;
1653 			break;
1654 		default:
1655 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1656 			break;
1657 		}
1658 
1659 		imsg_free(&imsg);
1660 		if (err)
1661 			break;
1662 	}
1663 done:
1664 	if (*tree && (*tree)->nentries != nentries) {
1665 		if (err == NULL)
1666 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1667 		got_object_tree_close(*tree);
1668 		*tree = NULL;
1669 	}
1670 
1671 	return err;
1672 }
1673 
1674 const struct got_error *
1675 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1676     const uint8_t *data)
1677 {
1678 	struct got_imsg_blob iblob;
1679 
1680 	iblob.size = size;
1681 	iblob.hdrlen = hdrlen;
1682 
1683 	if (data) {
1684 		uint8_t *buf;
1685 
1686 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1687 			return got_error(GOT_ERR_NO_SPACE);
1688 
1689 		buf = malloc(sizeof(iblob) + size);
1690 		if (buf == NULL)
1691 			return got_error_from_errno("malloc");
1692 
1693 		memcpy(buf, &iblob, sizeof(iblob));
1694 		memcpy(buf + sizeof(iblob), data, size);
1695 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1696 		    sizeof(iblob) + size) == -1) {
1697 			free(buf);
1698 			return got_error_from_errno("imsg_compose BLOB");
1699 		}
1700 		free(buf);
1701 	} else {
1702 		/* Data has already been written to file descriptor. */
1703 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1704 		    sizeof(iblob)) == -1)
1705 			return got_error_from_errno("imsg_compose BLOB");
1706 	}
1707 
1708 
1709 	return flush_imsg(ibuf);
1710 }
1711 
1712 const struct got_error *
1713 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1714     struct imsgbuf *ibuf)
1715 {
1716 	const struct got_error *err = NULL;
1717 	struct imsg imsg;
1718 	struct got_imsg_blob *iblob;
1719 	size_t datalen;
1720 
1721 	*outbuf = NULL;
1722 
1723 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1724 	if (err)
1725 		return err;
1726 
1727 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1728 
1729 	switch (imsg.hdr.type) {
1730 	case GOT_IMSG_BLOB:
1731 		if (datalen < sizeof(*iblob)) {
1732 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1733 			break;
1734 		}
1735 		iblob = imsg.data;
1736 		*size = iblob->size;
1737 		*hdrlen = iblob->hdrlen;
1738 
1739 		if (datalen == sizeof(*iblob)) {
1740 			/* Data has been written to file descriptor. */
1741 			break;
1742 		}
1743 
1744 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1745 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1746 			break;
1747 		}
1748 
1749 		*outbuf = malloc(*size);
1750 		if (*outbuf == NULL) {
1751 			err = got_error_from_errno("malloc");
1752 			break;
1753 		}
1754 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1755 		break;
1756 	default:
1757 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1758 		break;
1759 	}
1760 
1761 	imsg_free(&imsg);
1762 
1763 	return err;
1764 }
1765 
1766 static const struct got_error *
1767 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1768 {
1769 	const struct got_error *err = NULL;
1770 	size_t offset, remain;
1771 
1772 	offset = 0;
1773 	remain = tagmsg_len;
1774 	while (remain > 0) {
1775 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1776 
1777 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1778 		    tag->tagmsg + offset, n) == -1) {
1779 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1780 			break;
1781 		}
1782 
1783 		err = flush_imsg(ibuf);
1784 		if (err)
1785 			break;
1786 
1787 		offset += n;
1788 		remain -= n;
1789 	}
1790 
1791 	return err;
1792 }
1793 
1794 const struct got_error *
1795 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1796 {
1797 	const struct got_error *err = NULL;
1798 	struct got_imsg_tag_object *itag;
1799 	uint8_t *buf;
1800 	size_t len, total;
1801 	size_t tag_len = strlen(tag->tag);
1802 	size_t tagger_len = strlen(tag->tagger);
1803 	size_t tagmsg_len = strlen(tag->tagmsg);
1804 
1805 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1806 
1807 	buf = malloc(total);
1808 	if (buf == NULL)
1809 		return got_error_from_errno("malloc");
1810 
1811 	itag = (struct got_imsg_tag_object *)buf;
1812 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1813 	itag->obj_type = tag->obj_type;
1814 	itag->tag_len = tag_len;
1815 	itag->tagger_len = tagger_len;
1816 	itag->tagger_time = tag->tagger_time;
1817 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1818 	itag->tagmsg_len = tagmsg_len;
1819 
1820 	len = sizeof(*itag);
1821 	memcpy(buf + len, tag->tag, tag_len);
1822 	len += tag_len;
1823 	memcpy(buf + len, tag->tagger, tagger_len);
1824 	len += tagger_len;
1825 
1826 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1827 		err = got_error_from_errno("imsg_compose TAG");
1828 		goto done;
1829 	}
1830 
1831 	if (tagmsg_len == 0 ||
1832 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1833 		err = flush_imsg(ibuf);
1834 		if (err)
1835 			goto done;
1836 	}
1837 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1838 done:
1839 	free(buf);
1840 	return err;
1841 }
1842 
1843 const struct got_error *
1844 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1845 {
1846 	const struct got_error *err = NULL;
1847 	struct imsg imsg;
1848 	struct got_imsg_tag_object *itag;
1849 	size_t len, datalen;
1850 	const size_t min_datalen =
1851 	    MIN(sizeof(struct got_imsg_error),
1852 	    sizeof(struct got_imsg_tag_object));
1853 
1854 	*tag = NULL;
1855 
1856 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1857 	if (err)
1858 		return err;
1859 
1860 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1861 	len = 0;
1862 
1863 	switch (imsg.hdr.type) {
1864 	case GOT_IMSG_TAG:
1865 		if (datalen < sizeof(*itag)) {
1866 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1867 			break;
1868 		}
1869 		itag = imsg.data;
1870 		if (datalen != sizeof(*itag) + itag->tag_len +
1871 		    itag->tagger_len) {
1872 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1873 			break;
1874 		}
1875 		len += sizeof(*itag);
1876 
1877 		*tag = calloc(1, sizeof(**tag));
1878 		if (*tag == NULL) {
1879 			err = got_error_from_errno("calloc");
1880 			break;
1881 		}
1882 
1883 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1884 
1885 		if (itag->tag_len == 0) {
1886 			(*tag)->tag = strdup("");
1887 			if ((*tag)->tag == NULL) {
1888 				err = got_error_from_errno("strdup");
1889 				break;
1890 			}
1891 		} else {
1892 			(*tag)->tag = malloc(itag->tag_len + 1);
1893 			if ((*tag)->tag == NULL) {
1894 				err = got_error_from_errno("malloc");
1895 				break;
1896 			}
1897 			memcpy((*tag)->tag, imsg.data + len,
1898 			    itag->tag_len);
1899 			(*tag)->tag[itag->tag_len] = '\0';
1900 		}
1901 		len += itag->tag_len;
1902 
1903 		(*tag)->obj_type = itag->obj_type;
1904 		(*tag)->tagger_time = itag->tagger_time;
1905 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1906 
1907 		if (itag->tagger_len == 0) {
1908 			(*tag)->tagger = strdup("");
1909 			if ((*tag)->tagger == NULL) {
1910 				err = got_error_from_errno("strdup");
1911 				break;
1912 			}
1913 		} else {
1914 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1915 			if ((*tag)->tagger == NULL) {
1916 				err = got_error_from_errno("malloc");
1917 				break;
1918 			}
1919 			memcpy((*tag)->tagger, imsg.data + len,
1920 			    itag->tagger_len);
1921 			(*tag)->tagger[itag->tagger_len] = '\0';
1922 		}
1923 		len += itag->tagger_len;
1924 
1925 		if (itag->tagmsg_len == 0) {
1926 			(*tag)->tagmsg = strdup("");
1927 			if ((*tag)->tagmsg == NULL) {
1928 				err = got_error_from_errno("strdup");
1929 				break;
1930 			}
1931 		} else {
1932 			size_t offset = 0, remain = itag->tagmsg_len;
1933 
1934 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1935 			if ((*tag)->tagmsg == NULL) {
1936 				err = got_error_from_errno("malloc");
1937 				break;
1938 			}
1939 			while (remain > 0) {
1940 				struct imsg imsg_log;
1941 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1942 				    remain);
1943 
1944 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1945 				if (err)
1946 					return err;
1947 
1948 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1949 					return got_error(GOT_ERR_PRIVSEP_MSG);
1950 
1951 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1952 				    n);
1953 				imsg_free(&imsg_log);
1954 				offset += n;
1955 				remain -= n;
1956 			}
1957 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1958 		}
1959 
1960 		break;
1961 	default:
1962 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1963 		break;
1964 	}
1965 
1966 	imsg_free(&imsg);
1967 
1968 	return err;
1969 }
1970 
1971 const struct got_error *
1972 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1973     struct got_packidx *packidx)
1974 {
1975 	const struct got_error *err = NULL;
1976 	struct got_imsg_packidx ipackidx;
1977 	struct got_imsg_pack ipack;
1978 	int fd;
1979 
1980 	ipackidx.len = packidx->len;
1981 	ipackidx.packfile_size = pack->filesize;
1982 	fd = dup(packidx->fd);
1983 	if (fd == -1)
1984 		return got_error_from_errno("dup");
1985 
1986 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1987 	    sizeof(ipackidx)) == -1) {
1988 		err = got_error_from_errno("imsg_compose PACKIDX");
1989 		close(fd);
1990 		return err;
1991 	}
1992 
1993 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1994 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1995 		return got_error(GOT_ERR_NO_SPACE);
1996 	ipack.filesize = pack->filesize;
1997 
1998 	fd = dup(pack->fd);
1999 	if (fd == -1)
2000 		return got_error_from_errno("dup");
2001 
2002 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
2003 	    == -1) {
2004 		err = got_error_from_errno("imsg_compose PACK");
2005 		close(fd);
2006 		return err;
2007 	}
2008 
2009 	return flush_imsg(ibuf);
2010 }
2011 
2012 const struct got_error *
2013 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
2014     struct got_object_id *id)
2015 {
2016 	struct got_imsg_packed_object iobj;
2017 
2018 	iobj.idx = idx;
2019 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2020 
2021 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2022 	    &iobj, sizeof(iobj)) == -1)
2023 		return got_error_from_errno("imsg_compose "
2024 		    "PACKED_OBJECT_REQUEST");
2025 
2026 	return flush_imsg(ibuf);
2027 }
2028 
2029 const struct got_error *
2030 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2031     struct got_object_id *id)
2032 {
2033 	struct got_imsg_packed_object iobj;
2034 
2035 	iobj.idx = idx;
2036 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2037 
2038 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2039 	    &iobj, sizeof(iobj)) == -1)
2040 		return got_error_from_errno("imsg_compose "
2041 		    "PACKED_OBJECT_REQUEST");
2042 
2043 	return flush_imsg(ibuf);
2044 }
2045 
2046 const struct got_error *
2047 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2048 {
2049 	const struct got_error *err = NULL;
2050 
2051 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2052 	    NULL, 0) == -1) {
2053 		err = got_error_from_errno("imsg_compose "
2054 		    "GITCONFIG_PARSE_REQUEST");
2055 		close(fd);
2056 		return err;
2057 	}
2058 
2059 	return flush_imsg(ibuf);
2060 }
2061 
2062 const struct got_error *
2063 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2064 {
2065 	if (imsg_compose(ibuf,
2066 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2067 	    NULL, 0) == -1)
2068 		return got_error_from_errno("imsg_compose "
2069 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2070 
2071 	return flush_imsg(ibuf);
2072 }
2073 
2074 const struct got_error *
2075 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2076 {
2077 	if (imsg_compose(ibuf,
2078 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2079 	    NULL, 0) == -1)
2080 		return got_error_from_errno("imsg_compose "
2081 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2082 
2083 	return flush_imsg(ibuf);
2084 }
2085 
2086 
2087 const struct got_error *
2088 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2089 {
2090 	if (imsg_compose(ibuf,
2091 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2092 		return got_error_from_errno("imsg_compose "
2093 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2094 
2095 	return flush_imsg(ibuf);
2096 }
2097 
2098 const struct got_error *
2099 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2100 {
2101 	if (imsg_compose(ibuf,
2102 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2103 		return got_error_from_errno("imsg_compose "
2104 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2105 
2106 	return flush_imsg(ibuf);
2107 }
2108 
2109 const struct got_error *
2110 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2111 {
2112 	if (imsg_compose(ibuf,
2113 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2114 		return got_error_from_errno("imsg_compose "
2115 		    "GITCONFIG_REMOTE_REQUEST");
2116 
2117 	return flush_imsg(ibuf);
2118 }
2119 
2120 const struct got_error *
2121 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2122 {
2123 	if (imsg_compose(ibuf,
2124 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2125 		return got_error_from_errno("imsg_compose "
2126 		    "GITCONFIG_OWNER_REQUEST");
2127 
2128 	return flush_imsg(ibuf);
2129 }
2130 
2131 const struct got_error *
2132 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2133 {
2134 	const struct got_error *err = NULL;
2135 	struct imsg imsg;
2136 	size_t datalen;
2137 	const size_t min_datalen = 0;
2138 
2139 	*str = NULL;
2140 
2141 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2142 	if (err)
2143 		return err;
2144 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2145 
2146 	switch (imsg.hdr.type) {
2147 	case GOT_IMSG_GITCONFIG_STR_VAL:
2148 		if (datalen == 0)
2149 			break;
2150 		/* datalen does not include terminating \0 */
2151 		*str = malloc(datalen + 1);
2152 		if (*str == NULL) {
2153 			err = got_error_from_errno("malloc");
2154 			break;
2155 		}
2156 		memcpy(*str, imsg.data, datalen);
2157 		(*str)[datalen] = '\0';
2158 		break;
2159 	default:
2160 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2161 		break;
2162 	}
2163 
2164 	imsg_free(&imsg);
2165 	return err;
2166 }
2167 
2168 const struct got_error *
2169 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2170 {
2171 	const struct got_error *err = NULL;
2172 	struct imsg imsg;
2173 	size_t datalen;
2174 	const size_t min_datalen =
2175 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2176 
2177 	*val = 0;
2178 
2179 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2180 	if (err)
2181 		return err;
2182 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2183 
2184 	switch (imsg.hdr.type) {
2185 	case GOT_IMSG_GITCONFIG_INT_VAL:
2186 		if (datalen != sizeof(*val)) {
2187 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2188 			break;
2189 		}
2190 		memcpy(val, imsg.data, sizeof(*val));
2191 		break;
2192 	default:
2193 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2194 		break;
2195 	}
2196 
2197 	imsg_free(&imsg);
2198 	return err;
2199 }
2200 
2201 static void
2202 free_remote_data(struct got_remote_repo *remote)
2203 {
2204 	int i;
2205 
2206 	free(remote->name);
2207 	free(remote->fetch_url);
2208 	free(remote->send_url);
2209 	for (i = 0; i < remote->nfetch_branches; i++)
2210 		free(remote->fetch_branches[i]);
2211 	free(remote->fetch_branches);
2212 	for (i = 0; i < remote->nsend_branches; i++)
2213 		free(remote->send_branches[i]);
2214 	free(remote->send_branches);
2215 	for (i = 0; i < remote->nfetch_refs; i++)
2216 		free(remote->fetch_refs[i]);
2217 	free(remote->fetch_refs);
2218 }
2219 
2220 const struct got_error *
2221 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2222     int *nremotes, struct imsgbuf *ibuf)
2223 {
2224 	const struct got_error *err = NULL;
2225 	struct imsg imsg;
2226 	size_t datalen;
2227 	struct got_imsg_remotes iremotes;
2228 	struct got_imsg_remote iremote;
2229 
2230 	*remotes = NULL;
2231 	*nremotes = 0;
2232 	iremotes.nremotes = 0;
2233 
2234 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2235 	if (err)
2236 		return err;
2237 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2238 
2239 	switch (imsg.hdr.type) {
2240 	case GOT_IMSG_GITCONFIG_REMOTES:
2241 		if (datalen != sizeof(iremotes)) {
2242 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2243 			break;
2244 		}
2245 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2246 		if (iremotes.nremotes == 0) {
2247 			imsg_free(&imsg);
2248 			return NULL;
2249 		}
2250 		break;
2251 	default:
2252 		imsg_free(&imsg);
2253 		return got_error(GOT_ERR_PRIVSEP_MSG);
2254 	}
2255 
2256 	imsg_free(&imsg);
2257 
2258 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2259 	if (*remotes == NULL)
2260 		return got_error_from_errno("recallocarray");
2261 
2262 	while (*nremotes < iremotes.nremotes) {
2263 		struct got_remote_repo *remote;
2264 
2265 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2266 		if (err)
2267 			break;
2268 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2269 
2270 		switch (imsg.hdr.type) {
2271 		case GOT_IMSG_GITCONFIG_REMOTE:
2272 			remote = &(*remotes)[*nremotes];
2273 			memset(remote, 0, sizeof(*remote));
2274 			if (datalen < sizeof(iremote)) {
2275 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2276 				break;
2277 			}
2278 			memcpy(&iremote, imsg.data, sizeof(iremote));
2279 			if (iremote.name_len == 0 ||
2280 			    iremote.fetch_url_len == 0 ||
2281 			    iremote.send_url_len == 0 ||
2282 			    (sizeof(iremote) + iremote.name_len +
2283 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2284 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2285 				break;
2286 			}
2287 			remote->name = strndup(imsg.data + sizeof(iremote),
2288 			    iremote.name_len);
2289 			if (remote->name == NULL) {
2290 				err = got_error_from_errno("strndup");
2291 				break;
2292 			}
2293 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2294 			    iremote.name_len, iremote.fetch_url_len);
2295 			if (remote->fetch_url == NULL) {
2296 				err = got_error_from_errno("strndup");
2297 				free_remote_data(remote);
2298 				break;
2299 			}
2300 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2301 			    iremote.name_len + iremote.fetch_url_len,
2302 			    iremote.send_url_len);
2303 			if (remote->send_url == NULL) {
2304 				err = got_error_from_errno("strndup");
2305 				free_remote_data(remote);
2306 				break;
2307 			}
2308 			remote->mirror_references = iremote.mirror_references;
2309 			remote->fetch_all_branches = iremote.fetch_all_branches;
2310 			remote->nfetch_branches = 0;
2311 			remote->fetch_branches = NULL;
2312 			remote->nsend_branches = 0;
2313 			remote->send_branches = NULL;
2314 			remote->nfetch_refs = 0;
2315 			remote->fetch_refs = NULL;
2316 			(*nremotes)++;
2317 			break;
2318 		default:
2319 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2320 			break;
2321 		}
2322 
2323 		imsg_free(&imsg);
2324 		if (err)
2325 			break;
2326 	}
2327 
2328 	if (err) {
2329 		int i;
2330 		for (i = 0; i < *nremotes; i++)
2331 			free_remote_data(&(*remotes)[i]);
2332 		free(*remotes);
2333 		*remotes = NULL;
2334 		*nremotes = 0;
2335 	}
2336 	return err;
2337 }
2338 
2339 const struct got_error *
2340 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2341 {
2342 	const struct got_error *err = NULL;
2343 
2344 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2345 	    NULL, 0) == -1) {
2346 		err = got_error_from_errno("imsg_compose "
2347 		    "GOTCONFIG_PARSE_REQUEST");
2348 		close(fd);
2349 		return err;
2350 	}
2351 
2352 	return flush_imsg(ibuf);
2353 }
2354 
2355 const struct got_error *
2356 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2357 {
2358 	if (imsg_compose(ibuf,
2359 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2360 		return got_error_from_errno("imsg_compose "
2361 		    "GOTCONFIG_AUTHOR_REQUEST");
2362 
2363 	return flush_imsg(ibuf);
2364 }
2365 
2366 const struct got_error *
2367 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2368 {
2369 	if (imsg_compose(ibuf,
2370 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2371 		return got_error_from_errno("imsg_compose "
2372 		    "GOTCONFIG_REMOTE_REQUEST");
2373 
2374 	return flush_imsg(ibuf);
2375 }
2376 
2377 const struct got_error *
2378 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2379 {
2380 	const struct got_error *err = NULL;
2381 	struct imsg imsg;
2382 	size_t datalen;
2383 	const size_t min_datalen = 0;
2384 
2385 	*str = NULL;
2386 
2387 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2388 	if (err)
2389 		return err;
2390 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2391 
2392 	switch (imsg.hdr.type) {
2393 	case GOT_IMSG_ERROR:
2394 		if (datalen < sizeof(struct got_imsg_error)) {
2395 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2396 			break;
2397 		}
2398 		err = recv_imsg_error(&imsg, datalen);
2399 		break;
2400 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2401 		if (datalen == 0)
2402 			break;
2403 		/* datalen does not include terminating \0 */
2404 		*str = malloc(datalen + 1);
2405 		if (*str == NULL) {
2406 			err = got_error_from_errno("malloc");
2407 			break;
2408 		}
2409 		memcpy(*str, imsg.data, datalen);
2410 		(*str)[datalen] = '\0';
2411 		break;
2412 	default:
2413 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2414 		break;
2415 	}
2416 
2417 	imsg_free(&imsg);
2418 	return err;
2419 }
2420 
2421 const struct got_error *
2422 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2423     int *nremotes, struct imsgbuf *ibuf)
2424 {
2425 	const struct got_error *err = NULL;
2426 	struct imsg imsg;
2427 	size_t datalen;
2428 	struct got_imsg_remotes iremotes;
2429 	struct got_imsg_remote iremote;
2430 	const size_t min_datalen =
2431 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2432 
2433 	*remotes = NULL;
2434 	*nremotes = 0;
2435 	iremotes.nremotes = 0;
2436 
2437 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2438 	if (err)
2439 		return err;
2440 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2441 
2442 	switch (imsg.hdr.type) {
2443 	case GOT_IMSG_ERROR:
2444 		if (datalen < sizeof(struct got_imsg_error)) {
2445 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2446 			break;
2447 		}
2448 		err = recv_imsg_error(&imsg, datalen);
2449 		break;
2450 	case GOT_IMSG_GOTCONFIG_REMOTES:
2451 		if (datalen != sizeof(iremotes)) {
2452 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2453 			break;
2454 		}
2455 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2456 		if (iremotes.nremotes == 0) {
2457 			imsg_free(&imsg);
2458 			return NULL;
2459 		}
2460 		break;
2461 	default:
2462 		imsg_free(&imsg);
2463 		return got_error(GOT_ERR_PRIVSEP_MSG);
2464 	}
2465 
2466 	imsg_free(&imsg);
2467 
2468 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2469 	if (*remotes == NULL)
2470 		return got_error_from_errno("recallocarray");
2471 
2472 	while (*nremotes < iremotes.nremotes) {
2473 		struct got_remote_repo *remote;
2474 		const size_t min_datalen =
2475 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2476 		int i;
2477 
2478 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2479 		if (err)
2480 			break;
2481 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2482 
2483 		switch (imsg.hdr.type) {
2484 		case GOT_IMSG_ERROR:
2485 			if (datalen < sizeof(struct got_imsg_error)) {
2486 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2487 				break;
2488 			}
2489 			err = recv_imsg_error(&imsg, datalen);
2490 			break;
2491 		case GOT_IMSG_GOTCONFIG_REMOTE:
2492 			remote = &(*remotes)[*nremotes];
2493 			memset(remote, 0, sizeof(*remote));
2494 			if (datalen < sizeof(iremote)) {
2495 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2496 				break;
2497 			}
2498 			memcpy(&iremote, imsg.data, sizeof(iremote));
2499 			if (iremote.name_len == 0 ||
2500 			    (iremote.fetch_url_len == 0 &&
2501 			    iremote.send_url_len == 0) ||
2502 			    (sizeof(iremote) + iremote.name_len +
2503 			    iremote.fetch_url_len + iremote.send_url_len) >
2504 			    datalen) {
2505 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2506 				break;
2507 			}
2508 			remote->name = strndup(imsg.data + sizeof(iremote),
2509 			    iremote.name_len);
2510 			if (remote->name == NULL) {
2511 				err = got_error_from_errno("strndup");
2512 				break;
2513 			}
2514 			remote->fetch_url = strndup(imsg.data +
2515 			    sizeof(iremote) + iremote.name_len,
2516 			    iremote.fetch_url_len);
2517 			if (remote->fetch_url == NULL) {
2518 				err = got_error_from_errno("strndup");
2519 				free_remote_data(remote);
2520 				break;
2521 			}
2522 			remote->send_url = strndup(imsg.data +
2523 			    sizeof(iremote) + iremote.name_len +
2524 			    iremote.fetch_url_len, iremote.send_url_len);
2525 			if (remote->send_url == NULL) {
2526 				err = got_error_from_errno("strndup");
2527 				free_remote_data(remote);
2528 				break;
2529 			}
2530 			remote->mirror_references = iremote.mirror_references;
2531 			remote->fetch_all_branches = iremote.fetch_all_branches;
2532 			if (iremote.nfetch_branches > 0) {
2533 				remote->fetch_branches = recallocarray(NULL, 0,
2534 				    iremote.nfetch_branches, sizeof(char *));
2535 				if (remote->fetch_branches == NULL) {
2536 					err = got_error_from_errno("calloc");
2537 					free_remote_data(remote);
2538 					break;
2539 				}
2540 			}
2541 			remote->nfetch_branches = 0;
2542 			for (i = 0; i < iremote.nfetch_branches; i++) {
2543 				char *branch;
2544 				err = got_privsep_recv_gotconfig_str(&branch,
2545 				    ibuf);
2546 				if (err) {
2547 					free_remote_data(remote);
2548 					goto done;
2549 				}
2550 				remote->fetch_branches[i] = branch;
2551 				remote->nfetch_branches++;
2552 			}
2553 			if (iremote.nsend_branches > 0) {
2554 				remote->send_branches = recallocarray(NULL, 0,
2555 				    iremote.nsend_branches, sizeof(char *));
2556 				if (remote->send_branches == NULL) {
2557 					err = got_error_from_errno("calloc");
2558 					free_remote_data(remote);
2559 					break;
2560 				}
2561 			}
2562 			remote->nsend_branches = 0;
2563 			for (i = 0; i < iremote.nsend_branches; i++) {
2564 				char *branch;
2565 				err = got_privsep_recv_gotconfig_str(&branch,
2566 				    ibuf);
2567 				if (err) {
2568 					free_remote_data(remote);
2569 					goto done;
2570 				}
2571 				remote->send_branches[i] = branch;
2572 				remote->nsend_branches++;
2573 			}
2574 			if (iremote.nfetch_refs > 0) {
2575 				remote->fetch_refs = recallocarray(NULL, 0,
2576 				    iremote.nfetch_refs, sizeof(char *));
2577 				if (remote->fetch_refs == NULL) {
2578 					err = got_error_from_errno("calloc");
2579 					free_remote_data(remote);
2580 					break;
2581 				}
2582 			}
2583 			remote->nfetch_refs = 0;
2584 			for (i = 0; i < iremote.nfetch_refs; i++) {
2585 				char *ref;
2586 				err = got_privsep_recv_gotconfig_str(&ref,
2587 				    ibuf);
2588 				if (err) {
2589 					free_remote_data(remote);
2590 					goto done;
2591 				}
2592 				remote->fetch_refs[i] = ref;
2593 				remote->nfetch_refs++;
2594 			}
2595 			(*nremotes)++;
2596 			break;
2597 		default:
2598 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2599 			break;
2600 		}
2601 
2602 		imsg_free(&imsg);
2603 		if (err)
2604 			break;
2605 	}
2606 done:
2607 	if (err) {
2608 		int i;
2609 		for (i = 0; i < *nremotes; i++)
2610 			free_remote_data(&(*remotes)[i]);
2611 		free(*remotes);
2612 		*remotes = NULL;
2613 		*nremotes = 0;
2614 	}
2615 	return err;
2616 }
2617 
2618 const struct got_error *
2619 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2620     struct got_object_id *id, int idx, const char *path)
2621 {
2622 	const struct got_error *err = NULL;
2623 	struct ibuf *wbuf;
2624 	size_t path_len = strlen(path) + 1;
2625 
2626 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2627 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2628 	if (wbuf == NULL)
2629 		return got_error_from_errno(
2630 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2631 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2632 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2633 		ibuf_free(wbuf);
2634 		return err;
2635 	}
2636 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
2637 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2638 		ibuf_free(wbuf);
2639 		return err;
2640 	}
2641 	if (imsg_add(wbuf, path, path_len) == -1) {
2642 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2643 		ibuf_free(wbuf);
2644 		return err;
2645 	}
2646 
2647 	wbuf->fd = -1;
2648 	imsg_close(ibuf, wbuf);
2649 
2650 	return flush_imsg(ibuf);
2651 }
2652 
2653 const struct got_error *
2654 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2655     struct got_object_id **changed_commit_id,
2656     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2657 {
2658 	const struct got_error *err = NULL;
2659 	struct imsg imsg;
2660 	struct got_imsg_traversed_commits *icommits;
2661 	size_t datalen;
2662 	int i, done = 0;
2663 
2664 	*changed_commit = NULL;
2665 	*changed_commit_id = NULL;
2666 
2667 	while (!done) {
2668 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2669 		if (err)
2670 			return err;
2671 
2672 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2673 		switch (imsg.hdr.type) {
2674 		case GOT_IMSG_TRAVERSED_COMMITS:
2675 			icommits = imsg.data;
2676 			if (datalen != sizeof(*icommits) +
2677 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2678 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2679 				break;
2680 			}
2681 			for (i = 0; i < icommits->ncommits; i++) {
2682 				struct got_object_qid *qid;
2683 				uint8_t *sha1 = (uint8_t *)imsg.data +
2684 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2685 				err = got_object_qid_alloc_partial(&qid);
2686 				if (err)
2687 					break;
2688 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
2689 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2690 
2691 				/* The last commit may contain a change. */
2692 				if (i == icommits->ncommits - 1) {
2693 					*changed_commit_id =
2694 					    got_object_id_dup(qid->id);
2695 					if (*changed_commit_id == NULL) {
2696 						err = got_error_from_errno(
2697 						    "got_object_id_dup");
2698 						break;
2699 					}
2700 				}
2701 			}
2702 			break;
2703 		case GOT_IMSG_COMMIT:
2704 			if (*changed_commit_id == NULL) {
2705 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2706 				break;
2707 			}
2708 			err = get_commit_from_imsg(changed_commit, &imsg,
2709 			    datalen, ibuf);
2710 			break;
2711 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2712 			done = 1;
2713 			break;
2714 		default:
2715 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2716 			break;
2717 		}
2718 
2719 		imsg_free(&imsg);
2720 		if (err)
2721 			break;
2722 	}
2723 
2724 	if (err)
2725 		got_object_id_queue_free(commit_ids);
2726 	return err;
2727 }
2728 
2729 const struct got_error *
2730 got_privsep_unveil_exec_helpers(void)
2731 {
2732 	const char *helpers[] = {
2733 	    GOT_PATH_PROG_READ_PACK,
2734 	    GOT_PATH_PROG_READ_OBJECT,
2735 	    GOT_PATH_PROG_READ_COMMIT,
2736 	    GOT_PATH_PROG_READ_TREE,
2737 	    GOT_PATH_PROG_READ_BLOB,
2738 	    GOT_PATH_PROG_READ_TAG,
2739 	    GOT_PATH_PROG_READ_GITCONFIG,
2740 	    GOT_PATH_PROG_READ_GOTCONFIG,
2741 	    GOT_PATH_PROG_FETCH_PACK,
2742 	    GOT_PATH_PROG_INDEX_PACK,
2743 	    GOT_PATH_PROG_SEND_PACK,
2744 	};
2745 	size_t i;
2746 
2747 	for (i = 0; i < nitems(helpers); i++) {
2748 		if (unveil(helpers[i], "x") == 0)
2749 			continue;
2750 		return got_error_from_errno2("unveil", helpers[i]);
2751 	}
2752 
2753 	return NULL;
2754 }
2755 
2756 void
2757 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
2758 {
2759 	if (close(imsg_fds[0]) == -1) {
2760 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2761 		_exit(1);
2762 	}
2763 
2764 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
2765 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2766 		_exit(1);
2767 	}
2768 
2769 	closefrom(GOT_IMSG_FD_CHILD + 1);
2770 
2771 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
2772 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
2773 		    strerror(errno));
2774 		_exit(1);
2775 	}
2776 }