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/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <sha2.h>
35 #include <unistd.h>
36 #include <zlib.h>
37 
38 #include "got_object.h"
39 #include "got_error.h"
40 #include "got_path.h"
41 #include "got_repository.h"
42 
43 #include "got_lib_hash.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_object_qid.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_pack.h"
51 #include "got_lib_poll.h"
52 
53 #include "got_privsep.h"
54 
55 #ifndef MIN
56 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
57 #endif
58 
59 #ifndef nitems
60 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
61 #endif
62 
63 static const struct got_error *
64 read_imsg(struct imsgbuf *ibuf)
65 {
66 	const struct got_error *err;
67 	size_t n;
68 
69 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
70 	if (err) {
71 		if (err->code == GOT_ERR_EOF)
72 			return got_error(GOT_ERR_PRIVSEP_PIPE);
73 		return err;
74 	}
75 
76 	n = imsg_read(ibuf);
77 	if (n == -1) {
78 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
79 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
80 		return got_error(GOT_ERR_PRIVSEP_READ);
81 	}
82 	if (n == 0)
83 		return got_error(GOT_ERR_PRIVSEP_PIPE);
84 
85 	return NULL;
86 }
87 
88 const struct got_error *
89 got_privsep_wait_for_child(pid_t pid)
90 {
91 	int child_status;
92 
93 	if (waitpid(pid, &child_status, 0) == -1)
94 		return got_error_from_errno("waitpid");
95 
96 	if (!WIFEXITED(child_status))
97 		return got_error(GOT_ERR_PRIVSEP_DIED);
98 
99 	if (WEXITSTATUS(child_status) != 0)
100 		return got_error(GOT_ERR_PRIVSEP_EXIT);
101 
102 	return NULL;
103 }
104 
105 static const struct got_error *
106 recv_imsg_error(struct imsg *imsg, size_t datalen)
107 {
108 	struct got_imsg_error *ierr;
109 
110 	if (datalen != sizeof(*ierr))
111 		return got_error(GOT_ERR_PRIVSEP_LEN);
112 
113 	ierr = imsg->data;
114 	if (ierr->code == GOT_ERR_ERRNO) {
115 		static struct got_error serr;
116 		serr.code = GOT_ERR_ERRNO;
117 		serr.msg = strerror(ierr->errno_code);
118 		return &serr;
119 	}
120 
121 	return got_error(ierr->code);
122 }
123 
124 const struct got_error *
125 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
126     size_t min_datalen)
127 {
128 	const struct got_error *err;
129 	ssize_t n;
130 
131 	n = imsg_get(ibuf, imsg);
132 	if (n == -1)
133 		return got_error_from_errno("imsg_get");
134 
135 	while (n == 0) {
136 		err = read_imsg(ibuf);
137 		if (err)
138 			return err;
139 		n = imsg_get(ibuf, imsg);
140 		if (n == -1)
141 			return got_error_from_errno("imsg_get");
142 	}
143 
144 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
145 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
146 		err = recv_imsg_error(imsg, datalen);
147 		imsg_free(imsg);
148 		return err;
149 	}
150 
151 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen) {
152 		imsg_free(imsg);
153 		return got_error(GOT_ERR_PRIVSEP_LEN);
154 	}
155 
156 	return NULL;
157 }
158 
159 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
160 void
161 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
162 {
163 	const struct got_error *poll_err;
164 	struct got_imsg_error ierr;
165 	int ret;
166 
167 	ierr.code = err->code;
168 	if (err->code == GOT_ERR_ERRNO)
169 		ierr.errno_code = errno;
170 	else
171 		ierr.errno_code = 0;
172 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
173 	if (ret == -1) {
174 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
175 		    getprogname(), err->code, err->msg, strerror(errno));
176 		return;
177 	}
178 
179 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
180 	if (poll_err) {
181 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
182 		    getprogname(), err->code, err->msg, poll_err->msg);
183 		return;
184 	}
185 
186 	ret = imsg_flush(ibuf);
187 	if (ret == -1) {
188 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
189 		    getprogname(), err->code, err->msg, strerror(errno));
190 		imsg_clear(ibuf);
191 		return;
192 	}
193 }
194 
195 static const struct got_error *
196 flush_imsg(struct imsgbuf *ibuf)
197 {
198 	const struct got_error *err;
199 
200 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
201 	if (err)
202 		return err;
203 
204 	if (imsg_flush(ibuf) == -1) {
205 		imsg_clear(ibuf);
206 		return got_error_from_errno("imsg_flush");
207 	}
208 
209 	return NULL;
210 }
211 
212 const struct got_error *
213 got_privsep_flush_imsg(struct imsgbuf *ibuf)
214 {
215 	return flush_imsg(ibuf);
216 }
217 
218 const struct got_error *
219 got_privsep_send_stop(int fd)
220 {
221 	struct imsgbuf ibuf;
222 
223 	imsg_init(&ibuf, fd);
224 
225 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
226 		return got_error_from_errno("imsg_compose STOP");
227 
228 	return flush_imsg(&ibuf);
229 }
230 
231 const struct got_error *
232 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
233     struct got_object_id *id)
234 {
235 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
236 	    id, sizeof(*id)) == -1)
237 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
238 
239 	return flush_imsg(ibuf);
240 }
241 
242 const struct got_error *
243 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
244     struct got_object_id *id)
245 {
246 	const struct got_error *err;
247 
248 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
249 	    id, sizeof(*id)) == -1) {
250 		err = got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
251 		close(fd);
252 		return err;
253 	}
254 
255 	return flush_imsg(ibuf);
256 }
257 
258 const struct got_error *
259 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
260 {
261 	const struct got_error *err = NULL;
262 
263 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
264 	    == -1) {
265 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
266 		close(outfd);
267 		return err;
268 	}
269 
270 	return flush_imsg(ibuf);
271 }
272 
273 const struct got_error *
274 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
275     uint8_t *data)
276 {
277 	struct got_imsg_raw_obj iobj;
278 	size_t len = sizeof(iobj);
279 	struct ibuf *wbuf;
280 
281 	memset(&iobj, 0, sizeof(iobj));
282 	iobj.hdrlen = hdrlen;
283 	iobj.size = size;
284 
285 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
286 		len += (size_t)size + hdrlen;
287 
288 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
289 	if (wbuf == NULL)
290 		return got_error_from_errno("imsg_create RAW_OBJECT");
291 
292 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
293 		return got_error_from_errno("imsg_add RAW_OBJECT");
294 
295 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
296 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
297 			return got_error_from_errno("imsg_add RAW_OBJECT");
298 	}
299 
300 	imsg_close(ibuf, wbuf);
301 	return flush_imsg(ibuf);
302 }
303 
304 const struct got_error *
305 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
306     struct imsgbuf *ibuf)
307 {
308 	const struct got_error *err = NULL;
309 	struct imsg imsg;
310 	struct got_imsg_raw_obj *iobj;
311 	size_t datalen;
312 
313 	*outbuf = NULL;
314 
315 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
316 	if (err)
317 		return err;
318 
319 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
320 
321 	switch (imsg.hdr.type) {
322 	case GOT_IMSG_RAW_OBJECT:
323 		if (datalen < sizeof(*iobj)) {
324 			err = got_error(GOT_ERR_PRIVSEP_LEN);
325 			break;
326 		}
327 		iobj = imsg.data;
328 		*size = iobj->size;
329 		*hdrlen = iobj->hdrlen;
330 
331 		if (datalen == sizeof(*iobj)) {
332 			/* Data has been written to file descriptor. */
333 			break;
334 		}
335 
336 		if (*size < 0 ||
337 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
338 			err = got_error(GOT_ERR_PRIVSEP_LEN);
339 			break;
340 		}
341 
342 		*outbuf = malloc(*size + *hdrlen);
343 		if (*outbuf == NULL) {
344 			err = got_error_from_errno("malloc");
345 			break;
346 		}
347 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
348 		break;
349 	default:
350 		err = got_error(GOT_ERR_PRIVSEP_MSG);
351 		break;
352 	}
353 
354 	imsg_free(&imsg);
355 
356 	return err;
357 }
358 
359 const struct got_error *
360 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
361     struct got_object_id *id, int pack_idx)
362 {
363 	const struct got_error *err = NULL;
364 	struct got_imsg_packed_object iobj;
365 	void *data;
366 	size_t len;
367 
368 	memset(&iobj, 0, sizeof(iobj));
369 	if (pack_idx != -1) { /* commit is packed */
370 		iobj.idx = pack_idx;
371 		memcpy(&iobj.id, id, sizeof(iobj.id));
372 		data = &iobj;
373 		len = sizeof(iobj);
374 	} else {
375 		data = id;
376 		len = sizeof(*id);
377 	}
378 
379 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
380 	    == -1) {
381 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
382 		close(fd);
383 		return err;
384 	}
385 
386 	return flush_imsg(ibuf);
387 }
388 
389 const struct got_error *
390 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
391     struct got_object_id *id, int pack_idx)
392 {
393 	const struct got_error *err;
394 	struct ibuf *wbuf;
395 	size_t len;
396 
397 	if (pack_idx != -1)
398 		len = sizeof(struct got_imsg_packed_object);
399 	else
400 		len = sizeof(*id);
401 
402 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
403 	if (wbuf == NULL) {
404 		err = got_error_from_errno("imsg_create TREE_REQUEST");
405 		if (fd != -1)
406 			close(fd);
407 		return err;
408 	}
409 
410 	if (imsg_add(wbuf, id, sizeof(*id)) == -1) {
411 		err = got_error_from_errno("imsg_add TREE_REQUEST");
412 		if (fd != -1)
413 			close(fd);
414 		return err;
415 	}
416 
417 	if (pack_idx != -1) { /* tree is packed */
418 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1) {
419 			err = got_error_from_errno("imsg_add TREE_REQUEST");
420 			if (fd != -1)
421 				close(fd);
422 			return err;
423 		}
424 	}
425 
426 	ibuf_fd_set(wbuf, fd);
427 	imsg_close(ibuf, wbuf);
428 
429 	return flush_imsg(ibuf);
430 }
431 
432 const struct got_error *
433 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
434     struct got_object_id *id, int pack_idx)
435 {
436 	const struct got_error *err;
437 	struct got_imsg_packed_object iobj;
438 	void *data;
439 	size_t len;
440 
441 	memset(&iobj, 0, sizeof(iobj));
442 	if (pack_idx != -1) { /* tag is packed */
443 		iobj.idx = pack_idx;
444 		memcpy(&iobj.id, id, sizeof(iobj.id));
445 		data = &iobj;
446 		len = sizeof(iobj);
447 	} else {
448 		data = id;
449 		len = sizeof(*id);
450 	}
451 
452 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
453 	    == -1) {
454 		err = got_error_from_errno("imsg_compose TAG_REQUEST");
455 		if (fd != -1)
456 			close(fd);
457 		return err;
458 	}
459 
460 	return flush_imsg(ibuf);
461 }
462 
463 const struct got_error *
464 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
465     struct got_object_id *id, int pack_idx)
466 {
467 	const struct got_error *err = NULL;
468 	struct got_imsg_packed_object iobj;
469 	void *data;
470 	size_t len;
471 
472 	memset(&iobj, 0, sizeof(iobj));
473 	if (pack_idx != -1) { /* blob is packed */
474 		iobj.idx = pack_idx;
475 		memcpy(&iobj.id, id, sizeof(iobj.id));
476 		data = &iobj;
477 		len = sizeof(iobj);
478 	} else {
479 		data = id;
480 		len = sizeof(*id);
481 	}
482 
483 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
484 	    == -1) {
485 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
486 		close(infd);
487 		return err;
488 	}
489 
490 	return flush_imsg(ibuf);
491 }
492 
493 const struct got_error *
494 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
495 {
496 	const struct got_error *err = NULL;
497 
498 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
499 	    == -1) {
500 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
501 		close(outfd);
502 		return err;
503 	}
504 
505 	return flush_imsg(ibuf);
506 }
507 
508 static const struct got_error *
509 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
510 {
511 	const struct got_error *err = NULL;
512 
513 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
514 		err = got_error_from_errno("imsg_compose TMPFD");
515 		close(fd);
516 		return err;
517 	}
518 
519 	return flush_imsg(ibuf);
520 }
521 
522 const struct got_error *
523 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
524 {
525 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
526 }
527 
528 const struct got_error *
529 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
530 {
531 	struct got_imsg_object iobj;
532 
533 	memset(&iobj, 0, sizeof(iobj));
534 
535 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
536 	iobj.type = obj->type;
537 	iobj.flags = obj->flags;
538 	iobj.hdrlen = obj->hdrlen;
539 	iobj.size = obj->size;
540 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
541 		iobj.pack_offset = obj->pack_offset;
542 		iobj.pack_idx = obj->pack_idx;
543 	}
544 
545 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
546 	    == -1)
547 		return got_error_from_errno("imsg_compose OBJECT");
548 
549 	return flush_imsg(ibuf);
550 }
551 
552 const struct got_error *
553 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
554     struct got_pathlist_head *have_refs, int fetch_all_branches,
555     struct got_pathlist_head *wanted_branches,
556     struct got_pathlist_head *wanted_refs, int list_refs_only,
557     const char *worktree_branch, const char *remote_head,
558     int no_head, int verbosity)
559 {
560 	const struct got_error *err = NULL;
561 	struct ibuf *wbuf;
562 	struct got_pathlist_entry *pe;
563 	struct got_imsg_fetch_request fetchreq;
564 	size_t remote_head_len, worktree_branch_len, len = sizeof(fetchreq);
565 
566 	if (worktree_branch) {
567 		worktree_branch_len = strlen(worktree_branch);
568 		len += worktree_branch_len;
569 	}
570 	if (remote_head) {
571 		remote_head_len = strlen(remote_head);
572 		len += remote_head_len;
573 	}
574 
575 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
576 		close(fd);
577 		return got_error(GOT_ERR_NO_SPACE);
578 	}
579 
580 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
581 	if (wbuf == NULL) {
582 		err = got_error_from_errno("imsg_create FETCH_HAVE_REF");
583 		close(fd);
584 		return err;
585 	}
586 
587 	memset(&fetchreq, 0, sizeof(fetchreq));
588 	fetchreq.no_head = no_head;
589 	fetchreq.fetch_all_branches = fetch_all_branches;
590 	fetchreq.list_refs_only = list_refs_only;
591 	fetchreq.verbosity = verbosity;
592 	if (worktree_branch != NULL)
593 		fetchreq.worktree_branch_len = worktree_branch_len;
594 	if (remote_head != NULL)
595 		fetchreq.remote_head_len = remote_head_len;
596 	TAILQ_FOREACH(pe, have_refs, entry)
597 		fetchreq.n_have_refs++;
598 	TAILQ_FOREACH(pe, wanted_branches, entry)
599 		fetchreq.n_wanted_branches++;
600 	TAILQ_FOREACH(pe, wanted_refs, entry)
601 		fetchreq.n_wanted_refs++;
602 	if (imsg_add(wbuf, &fetchreq, sizeof(fetchreq)) == -1)
603 		return got_error_from_errno("imsg_add FETCH_REQUEST");
604 	if (worktree_branch) {
605 		if (imsg_add(wbuf, worktree_branch, worktree_branch_len)
606 		    == -1) {
607 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
608 			close(fd);
609 			return err;
610 		}
611 	}
612 	if (remote_head) {
613 		if (imsg_add(wbuf, remote_head, remote_head_len) == -1) {
614 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
615 			close(fd);
616 			return err;
617 		}
618 	}
619 	ibuf_fd_set(wbuf, fd);
620 	fd = -1;
621 	imsg_close(ibuf, wbuf);
622 
623 	err = flush_imsg(ibuf);
624 	if (err)
625 		return err;
626 
627 	TAILQ_FOREACH(pe, have_refs, entry) {
628 		const char *name = pe->path;
629 		size_t name_len = pe->path_len;
630 		struct got_object_id *id = pe->data;
631 
632 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
633 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
634 		if (wbuf == NULL)
635 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
636 
637 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
638 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
639 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
640 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
641 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
642 		if (imsg_add(wbuf, name, name_len) == -1)
643 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
644 
645 		imsg_close(ibuf, wbuf);
646 		err = flush_imsg(ibuf);
647 		if (err)
648 			return err;
649 	}
650 
651 	TAILQ_FOREACH(pe, wanted_branches, entry) {
652 		const char *name = pe->path;
653 		size_t name_len = pe->path_len;
654 
655 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
656 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
657 		    len);
658 		if (wbuf == NULL)
659 			return got_error_from_errno(
660 			    "imsg_create FETCH_WANTED_BRANCH");
661 
662 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
663 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
664 			return got_error_from_errno(
665 			    "imsg_add FETCH_WANTED_BRANCH");
666 		if (imsg_add(wbuf, name, name_len) == -1)
667 			return got_error_from_errno(
668 			    "imsg_add FETCH_WANTED_BRANCH");
669 
670 		imsg_close(ibuf, wbuf);
671 		err = flush_imsg(ibuf);
672 		if (err)
673 			return err;
674 	}
675 
676 	TAILQ_FOREACH(pe, wanted_refs, entry) {
677 		const char *name = pe->path;
678 		size_t name_len = pe->path_len;
679 
680 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
681 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
682 		    len);
683 		if (wbuf == NULL)
684 			return got_error_from_errno(
685 			    "imsg_create FETCH_WANTED_REF");
686 
687 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
688 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
689 			return got_error_from_errno(
690 			    "imsg_add FETCH_WANTED_REF");
691 		if (imsg_add(wbuf, name, name_len) == -1)
692 			return got_error_from_errno(
693 			    "imsg_add FETCH_WANTED_REF");
694 
695 		imsg_close(ibuf, wbuf);
696 		err = flush_imsg(ibuf);
697 		if (err)
698 			return err;
699 	}
700 
701 	return NULL;
702 }
703 
704 const struct got_error *
705 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
706 {
707 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
708 }
709 
710 const struct got_error *
711 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
712     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
713     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
714 {
715 	const struct got_error *err = NULL;
716 	struct imsg imsg;
717 	size_t datalen;
718 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
719 	size_t n, remain;
720 	off_t off;
721 	int i;
722 
723 	*done = 0;
724 	*id = NULL;
725 	*refname = NULL;
726 	*server_progress = NULL;
727 	*packfile_size = 0;
728 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
729 
730 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
731 	if (err)
732 		return err;
733 
734 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
735 	switch (imsg.hdr.type) {
736 	case GOT_IMSG_FETCH_SYMREFS:
737 		if (datalen < sizeof(*isymrefs)) {
738 			err = got_error(GOT_ERR_PRIVSEP_LEN);
739 			break;
740 		}
741 		if (isymrefs != NULL) {
742 			err = got_error(GOT_ERR_PRIVSEP_MSG);
743 			break;
744 		}
745 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
746 		off = sizeof(*isymrefs);
747 		remain = datalen - off;
748 		for (n = 0; n < isymrefs->nsymrefs; n++) {
749 			struct got_imsg_fetch_symref *s;
750 			char *name, *target;
751 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
752 				err = got_error(GOT_ERR_PRIVSEP_LEN);
753 				goto done;
754 			}
755 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
756 			off += sizeof(*s);
757 			remain -= sizeof(*s);
758 			if (remain < s->name_len) {
759 				err = got_error(GOT_ERR_PRIVSEP_LEN);
760 				goto done;
761 			}
762 			name = strndup(imsg.data + off, s->name_len);
763 			if (name == NULL) {
764 				err = got_error_from_errno("strndup");
765 				goto done;
766 			}
767 			off += s->name_len;
768 			remain -= s->name_len;
769 			if (remain < s->target_len) {
770 				err = got_error(GOT_ERR_PRIVSEP_LEN);
771 				free(name);
772 				goto done;
773 			}
774 			target = strndup(imsg.data + off, s->target_len);
775 			if (target == NULL) {
776 				err = got_error_from_errno("strndup");
777 				free(name);
778 				goto done;
779 			}
780 			off += s->target_len;
781 			remain -= s->target_len;
782 			err = got_pathlist_append(symrefs, name, target);
783 			if (err) {
784 				free(name);
785 				free(target);
786 				goto done;
787 			}
788 		}
789 		break;
790 	case GOT_IMSG_FETCH_REF:
791 		if (datalen <= sizeof(**id)) {
792 			err = got_error(GOT_ERR_PRIVSEP_MSG);
793 			break;
794 		}
795 		*id = malloc(sizeof(**id));
796 		if (*id == NULL) {
797 			err = got_error_from_errno("malloc");
798 			break;
799 		}
800 		memcpy(*id, imsg.data, sizeof(**id));
801 		*refname = strndup(imsg.data + sizeof(**id),
802 		    datalen - sizeof(**id));
803 		if (*refname == NULL) {
804 			err = got_error_from_errno("strndup");
805 			break;
806 		}
807 		break;
808 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
809 		if (datalen == 0) {
810 			err = got_error(GOT_ERR_PRIVSEP_LEN);
811 			break;
812 		}
813 		*server_progress = strndup(imsg.data, datalen);
814 		if (*server_progress == NULL) {
815 			err = got_error_from_errno("strndup");
816 			break;
817 		}
818 		for (i = 0; i < datalen; i++) {
819 			if (!isprint((unsigned char)(*server_progress)[i]) &&
820 			    !isspace((unsigned char)(*server_progress)[i])) {
821 				err = got_error(GOT_ERR_PRIVSEP_MSG);
822 				free(*server_progress);
823 				*server_progress = NULL;
824 				goto done;
825 			}
826 		}
827 		break;
828 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
829 		if (datalen < sizeof(*packfile_size)) {
830 			err = got_error(GOT_ERR_PRIVSEP_MSG);
831 			break;
832 		}
833 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
834 		break;
835 	case GOT_IMSG_FETCH_DONE:
836 		if (datalen != SHA1_DIGEST_LENGTH) {
837 			err = got_error(GOT_ERR_PRIVSEP_MSG);
838 			break;
839 		}
840 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
841 		*done = 1;
842 		break;
843 	default:
844 		err = got_error(GOT_ERR_PRIVSEP_MSG);
845 		break;
846 	}
847 done:
848 	if (err) {
849 		free(*id);
850 		*id = NULL;
851 		free(*refname);
852 		*refname = NULL;
853 	}
854 	imsg_free(&imsg);
855 	return err;
856 }
857 
858 static const struct got_error *
859 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
860     int delete, struct imsgbuf *ibuf)
861 {
862 	size_t len;
863 	struct ibuf *wbuf;
864 
865 	len = sizeof(struct got_imsg_send_ref) + name_len;
866 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
867 	if (wbuf == NULL)
868 		return got_error_from_errno("imsg_create SEND_REF");
869 
870 	/* Keep in sync with struct got_imsg_send_ref! */
871 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
872 		return got_error_from_errno("imsg_add SEND_REF");
873 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
874 		return got_error_from_errno("imsg_add SEND_REF");
875 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
876 		return got_error_from_errno("imsg_add SEND_REF");
877 	if (imsg_add(wbuf, name, name_len) == -1)
878 		return got_error_from_errno("imsg_add SEND_REF");
879 
880 	imsg_close(ibuf, wbuf);
881 	return flush_imsg(ibuf);
882 }
883 
884 const struct got_error *
885 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
886     struct got_pathlist_head *have_refs,
887     struct got_pathlist_head *delete_refs,
888     int verbosity)
889 {
890 	const struct got_error *err = NULL;
891 	struct got_pathlist_entry *pe;
892 	struct got_imsg_send_request sendreq;
893 	struct got_object_id zero_id;
894 
895 	memset(&zero_id, 0, sizeof(zero_id));
896 	memset(&sendreq, 0, sizeof(sendreq));
897 	sendreq.verbosity = verbosity;
898 	TAILQ_FOREACH(pe, have_refs, entry)
899 		sendreq.nrefs++;
900 	TAILQ_FOREACH(pe, delete_refs, entry)
901 		sendreq.nrefs++;
902 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
903 	    &sendreq, sizeof(sendreq)) == -1) {
904 		err = got_error_from_errno(
905 		    "imsg_compose FETCH_SERVER_PROGRESS");
906 		goto done;
907 	}
908 
909 	fd = -1;
910 	err = flush_imsg(ibuf);
911 	if (err)
912 		goto done;
913 
914 	TAILQ_FOREACH(pe, have_refs, entry) {
915 		const char *name = pe->path;
916 		size_t name_len = pe->path_len;
917 		struct got_object_id *id = pe->data;
918 		err = send_send_ref(name, name_len, id, 0, ibuf);
919 		if (err)
920 			goto done;
921 	}
922 
923 	TAILQ_FOREACH(pe, delete_refs, entry) {
924 		const char *name = pe->path;
925 		size_t name_len = pe->path_len;
926 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
927 		if (err)
928 			goto done;
929 	}
930 done:
931 	if (fd != -1 && close(fd) == -1 && err == NULL)
932 		err = got_error_from_errno("close");
933 	return err;
934 }
935 
936 const struct got_error *
937 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
938     struct imsgbuf *ibuf)
939 {
940 	const struct got_error *err = NULL;
941 	struct imsg imsg;
942 	size_t datalen;
943 	int done = 0;
944 	struct got_imsg_send_remote_ref iremote_ref;
945 	struct got_object_id *id = NULL;
946 	char *refname = NULL;
947 	struct got_pathlist_entry *new;
948 
949 	while (!done) {
950 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
951 		if (err)
952 			return err;
953 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
954 		switch (imsg.hdr.type) {
955 		case GOT_IMSG_SEND_REMOTE_REF:
956 			if (datalen < sizeof(iremote_ref)) {
957 				err = got_error(GOT_ERR_PRIVSEP_MSG);
958 				goto done;
959 			}
960 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
961 			if (datalen != sizeof(iremote_ref) +
962 			    iremote_ref.name_len) {
963 				err = got_error(GOT_ERR_PRIVSEP_MSG);
964 				goto done;
965 			}
966 			id = malloc(sizeof(*id));
967 			if (id == NULL) {
968 				err = got_error_from_errno("malloc");
969 				goto done;
970 			}
971 			memcpy(id, &iremote_ref.id, sizeof(*id));
972 			refname = strndup(imsg.data + sizeof(iremote_ref),
973 			    datalen - sizeof(iremote_ref));
974 			if (refname == NULL) {
975 				err = got_error_from_errno("strndup");
976 				goto done;
977 			}
978 			err = got_pathlist_insert(&new, remote_refs,
979 			    refname, id);
980 			if (err)
981 				goto done;
982 			if (new == NULL) { /* duplicate which wasn't inserted */
983 				free(id);
984 				free(refname);
985 			}
986 			id = NULL;
987 			refname = NULL;
988 			break;
989 		case GOT_IMSG_SEND_PACK_REQUEST:
990 			if (datalen != 0) {
991 				err = got_error(GOT_ERR_PRIVSEP_MSG);
992 				goto done;
993 			}
994 			/* got-send-pack is now waiting for a pack file. */
995 			done = 1;
996 			break;
997 		default:
998 			err = got_error(GOT_ERR_PRIVSEP_MSG);
999 			break;
1000 		}
1001 	}
1002 done:
1003 	free(id);
1004 	free(refname);
1005 	imsg_free(&imsg);
1006 	return err;
1007 }
1008 
1009 const struct got_error *
1010 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
1011 {
1012 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
1013 }
1014 
1015 const struct got_error *
1016 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
1017     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
1018 {
1019 	const struct got_error *err = NULL;
1020 	struct imsg imsg;
1021 	size_t datalen;
1022 	struct got_imsg_send_ref_status iref_status;
1023 
1024 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1025 	*done = 0;
1026 	*success = 0;
1027 	*refname = NULL;
1028 	*errmsg = NULL;
1029 
1030 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1031 	if (err)
1032 		return err;
1033 
1034 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1035 	switch (imsg.hdr.type) {
1036 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1037 		if (datalen < sizeof(*bytes_sent)) {
1038 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1039 			break;
1040 		}
1041 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1042 		break;
1043 	case GOT_IMSG_SEND_REF_STATUS:
1044 		if (datalen < sizeof(iref_status)) {
1045 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1046 			break;
1047 		}
1048 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1049 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1050 		    iref_status.errmsg_len) {
1051 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1052 			break;
1053 		}
1054 		*success = iref_status.success;
1055 		*refname = strndup(imsg.data + sizeof(iref_status),
1056 		    iref_status.name_len);
1057 
1058 		if (iref_status.errmsg_len != 0)
1059 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1060 			    iref_status.name_len, iref_status.errmsg_len);
1061 		break;
1062 	case GOT_IMSG_SEND_DONE:
1063 		if (datalen != 0) {
1064 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1065 			break;
1066 		}
1067 		*done = 1;
1068 		break;
1069 	default:
1070 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1071 		break;
1072 	}
1073 
1074 	imsg_free(&imsg);
1075 	return err;
1076 }
1077 
1078 const struct got_error *
1079 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1080     int fd)
1081 {
1082 	const struct got_error *err = NULL;
1083 
1084 	/* Keep in sync with struct got_imsg_index_pack_request */
1085 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1086 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1087 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1088 		close(fd);
1089 		return err;
1090 	}
1091 	return flush_imsg(ibuf);
1092 }
1093 
1094 const struct got_error *
1095 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1096 {
1097 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1098 }
1099 
1100 const struct got_error *
1101 got_privsep_recv_index_progress(int *done, int *nobj_total,
1102     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1103     struct imsgbuf *ibuf)
1104 {
1105 	const struct got_error *err = NULL;
1106 	struct imsg imsg;
1107 	struct got_imsg_index_pack_progress *iprogress;
1108 	size_t datalen;
1109 
1110 	*done = 0;
1111 	*nobj_total = 0;
1112 	*nobj_indexed = 0;
1113 	*nobj_resolved = 0;
1114 
1115 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1116 	if (err)
1117 		return err;
1118 
1119 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1120 	switch (imsg.hdr.type) {
1121 	case GOT_IMSG_IDXPACK_PROGRESS:
1122 		if (datalen < sizeof(*iprogress)) {
1123 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1124 			break;
1125 		}
1126 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1127 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1128 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1129 			err = got_error(GOT_ERR_RANGE);
1130 			break;
1131 		}
1132 		*nobj_total = iprogress->nobj_total;
1133 		*nobj_indexed = iprogress->nobj_indexed;
1134 		*nobj_loose = iprogress->nobj_loose;
1135 		*nobj_resolved = iprogress->nobj_resolved;
1136 		break;
1137 	case GOT_IMSG_IDXPACK_DONE:
1138 		if (datalen != 0) {
1139 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1140 			break;
1141 		}
1142 		*done = 1;
1143 		break;
1144 	default:
1145 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1146 		break;
1147 	}
1148 
1149 	imsg_free(&imsg);
1150 	return err;
1151 }
1152 
1153 const struct got_error *
1154 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1155     struct imsgbuf *ibuf)
1156 {
1157 	struct got_imsg_object *iobj;
1158 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1159 
1160 	if (datalen != sizeof(*iobj))
1161 		return got_error(GOT_ERR_PRIVSEP_LEN);
1162 	iobj = imsg->data;
1163 
1164 	if (iobj->pack_offset < 0)
1165 		return got_error(GOT_ERR_PACK_OFFSET);
1166 
1167 	*obj = calloc(1, sizeof(**obj));
1168 	if (*obj == NULL)
1169 		return got_error_from_errno("calloc");
1170 
1171 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1172 	(*obj)->type = iobj->type;
1173 	(*obj)->flags = iobj->flags;
1174 	(*obj)->hdrlen = iobj->hdrlen;
1175 	(*obj)->size = iobj->size;
1176 	/* path_packfile is handled by caller */
1177 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1178 		(*obj)->pack_offset = iobj->pack_offset;
1179 		(*obj)->pack_idx = iobj->pack_idx;
1180 	}
1181 	STAILQ_INIT(&(*obj)->deltas.entries);
1182 	return NULL;
1183 }
1184 
1185 const struct got_error *
1186 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1187 {
1188 	const struct got_error *err = NULL;
1189 	struct imsg imsg;
1190 	const size_t min_datalen =
1191 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1192 
1193 	*obj = NULL;
1194 
1195 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1196 	if (err)
1197 		return err;
1198 
1199 	switch (imsg.hdr.type) {
1200 	case GOT_IMSG_OBJECT:
1201 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1202 		break;
1203 	default:
1204 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1205 		break;
1206 	}
1207 
1208 	imsg_free(&imsg);
1209 
1210 	return err;
1211 }
1212 
1213 static const struct got_error *
1214 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1215     size_t logmsg_len)
1216 {
1217 	const struct got_error *err = NULL;
1218 	size_t offset, remain;
1219 
1220 	offset = 0;
1221 	remain = logmsg_len;
1222 	while (remain > 0) {
1223 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1224 
1225 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1226 		    commit->logmsg + offset, n) == -1) {
1227 			err = got_error_from_errno("imsg_compose "
1228 			    "COMMIT_LOGMSG");
1229 			break;
1230 		}
1231 
1232 		err = flush_imsg(ibuf);
1233 		if (err)
1234 			break;
1235 
1236 		offset += n;
1237 		remain -= n;
1238 	}
1239 
1240 	return err;
1241 }
1242 
1243 const struct got_error *
1244 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1245 {
1246 	const struct got_error *err = NULL;
1247 	struct got_imsg_commit_object *icommit;
1248 	uint8_t *buf;
1249 	size_t len, total;
1250 	struct got_object_qid *qid;
1251 	size_t author_len = strlen(commit->author);
1252 	size_t committer_len = strlen(commit->committer);
1253 	size_t logmsg_len = strlen(commit->logmsg);
1254 
1255 	total = sizeof(*icommit) + author_len + committer_len +
1256 	    commit->nparents * sizeof(struct got_object_id);
1257 
1258 	buf = malloc(total);
1259 	if (buf == NULL)
1260 		return got_error_from_errno("malloc");
1261 
1262 	icommit = (struct got_imsg_commit_object *)buf;
1263 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1264 	icommit->author_len = author_len;
1265 	icommit->author_time = commit->author_time;
1266 	icommit->author_gmtoff = commit->author_gmtoff;
1267 	icommit->committer_len = committer_len;
1268 	icommit->committer_time = commit->committer_time;
1269 	icommit->committer_gmtoff = commit->committer_gmtoff;
1270 	icommit->logmsg_len = logmsg_len;
1271 	icommit->nparents = commit->nparents;
1272 
1273 	len = sizeof(*icommit);
1274 	memcpy(buf + len, commit->author, author_len);
1275 	len += author_len;
1276 	memcpy(buf + len, commit->committer, committer_len);
1277 	len += committer_len;
1278 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1279 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1280 		len += sizeof(qid->id);
1281 	}
1282 
1283 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1284 		err = got_error_from_errno("imsg_compose COMMIT");
1285 		goto done;
1286 	}
1287 
1288 	if (logmsg_len == 0 ||
1289 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1290 		err = flush_imsg(ibuf);
1291 		if (err)
1292 			goto done;
1293 	}
1294 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1295 done:
1296 	free(buf);
1297 	return err;
1298 }
1299 
1300 static const struct got_error *
1301 get_commit_from_imsg(struct got_commit_object **commit,
1302     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1303 {
1304 	const struct got_error *err = NULL;
1305 	struct got_imsg_commit_object *icommit;
1306 	size_t len = 0;
1307 	int i;
1308 
1309 	if (datalen < sizeof(*icommit))
1310 		return got_error(GOT_ERR_PRIVSEP_LEN);
1311 
1312 	icommit = imsg->data;
1313 	if (datalen != sizeof(*icommit) + icommit->author_len +
1314 	    icommit->committer_len +
1315 	    icommit->nparents * sizeof(struct got_object_id))
1316 		return got_error(GOT_ERR_PRIVSEP_LEN);
1317 
1318 	if (icommit->nparents < 0)
1319 		return got_error(GOT_ERR_PRIVSEP_LEN);
1320 
1321 	len += sizeof(*icommit);
1322 
1323 	*commit = got_object_commit_alloc_partial();
1324 	if (*commit == NULL)
1325 		return got_error_from_errno(
1326 		    "got_object_commit_alloc_partial");
1327 
1328 	memcpy((*commit)->tree_id, &icommit->tree_id,
1329 	    sizeof(icommit->tree_id));
1330 	(*commit)->author_time = icommit->author_time;
1331 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1332 	(*commit)->committer_time = icommit->committer_time;
1333 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1334 
1335 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1336 	if ((*commit)->author == NULL) {
1337 		err = got_error_from_errno("strndup");
1338 		goto done;
1339 	}
1340 	len += icommit->author_len;
1341 
1342 	(*commit)->committer = strndup(imsg->data + len,
1343 	    icommit->committer_len);
1344 	if ((*commit)->committer == NULL) {
1345 		err = got_error_from_errno("strndup");
1346 		goto done;
1347 	}
1348 	len += icommit->committer_len;
1349 
1350 	if (icommit->logmsg_len == 0) {
1351 		(*commit)->logmsg = strdup("");
1352 		if ((*commit)->logmsg == NULL) {
1353 			err = got_error_from_errno("strdup");
1354 			goto done;
1355 		}
1356 	} else {
1357 		size_t offset = 0, remain = icommit->logmsg_len;
1358 
1359 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1360 		if ((*commit)->logmsg == NULL) {
1361 			err = got_error_from_errno("malloc");
1362 			goto done;
1363 		}
1364 		while (remain > 0) {
1365 			struct imsg imsg_log;
1366 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1367 			    remain);
1368 
1369 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1370 			if (err)
1371 				goto done;
1372 
1373 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1374 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1375 				goto done;
1376 			}
1377 
1378 			memcpy((*commit)->logmsg + offset,
1379 			    imsg_log.data, n);
1380 			imsg_free(&imsg_log);
1381 			offset += n;
1382 			remain -= n;
1383 		}
1384 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1385 	}
1386 
1387 	for (i = 0; i < icommit->nparents; i++) {
1388 		struct got_object_qid *qid;
1389 
1390 		err = got_object_qid_alloc_partial(&qid);
1391 		if (err)
1392 			break;
1393 		memcpy(&qid->id, imsg->data + len +
1394 		    i * sizeof(qid->id), sizeof(qid->id));
1395 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1396 		(*commit)->nparents++;
1397 	}
1398 done:
1399 	if (err) {
1400 		got_object_commit_close(*commit);
1401 		*commit = NULL;
1402 	}
1403 	return err;
1404 }
1405 
1406 const struct got_error *
1407 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1408 {
1409 	const struct got_error *err = NULL;
1410 	struct imsg imsg;
1411 	size_t datalen;
1412 	const size_t min_datalen =
1413 	    MIN(sizeof(struct got_imsg_error),
1414 	    sizeof(struct got_imsg_commit_object));
1415 
1416 	*commit = NULL;
1417 
1418 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1419 	if (err)
1420 		return err;
1421 
1422 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1423 
1424 	switch (imsg.hdr.type) {
1425 	case GOT_IMSG_COMMIT:
1426 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1427 		break;
1428 	default:
1429 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1430 		break;
1431 	}
1432 
1433 	imsg_free(&imsg);
1434 
1435 	return err;
1436 }
1437 
1438 static const struct got_error *
1439 send_tree_entries_batch(struct imsgbuf *ibuf,
1440     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1441 {
1442 	struct ibuf *wbuf;
1443 	struct got_imsg_tree_entries ientries;
1444 	int i;
1445 
1446 	memset(&ientries, 0, sizeof(ientries));
1447 
1448 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1449 	if (wbuf == NULL)
1450 		return got_error_from_errno("imsg_create TREE_ENTRY");
1451 
1452 	ientries.nentries = idxN - idx0 + 1;
1453 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1454 		return got_error_from_errno("imsg_add TREE_ENTRY");
1455 
1456 	for (i = idx0; i <= idxN; i++) {
1457 		struct got_parsed_tree_entry *pte = &entries[i];
1458 
1459 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1460 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1461 			return got_error_from_errno("imsg_add TREE_ENTRY");
1462 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1463 			return got_error_from_errno("imsg_add TREE_ENTRY");
1464 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1465 			return got_error_from_errno("imsg_add TREE_ENTRY");
1466 
1467 		/* Remaining bytes are the entry's name. */
1468 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1469 			return got_error_from_errno("imsg_add TREE_ENTRY");
1470 	}
1471 
1472 	imsg_close(ibuf, wbuf);
1473 	return NULL;
1474 }
1475 
1476 static const struct got_error *
1477 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1478     int nentries)
1479 {
1480 	const struct got_error *err = NULL;
1481 	int i, j;
1482 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1483 
1484 	i = 0;
1485 	for (j = 0; j < nentries; j++) {
1486 		struct got_parsed_tree_entry *pte = &entries[j];
1487 		size_t len = sizeof(struct got_imsg_tree_entry) + pte->namelen;
1488 
1489 		if (j > 0 &&
1490 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1491 			err = send_tree_entries_batch(ibuf, entries,
1492 			    i, j - 1, entries_len);
1493 			if (err)
1494 				return err;
1495 			i = j;
1496 			entries_len = sizeof(struct got_imsg_tree_entries);
1497 		}
1498 
1499 		entries_len += len;
1500 	}
1501 
1502 	if (j > 0) {
1503 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1504 		    entries_len);
1505 		if (err)
1506 			return err;
1507 	}
1508 
1509 	return NULL;
1510 }
1511 
1512 const struct got_error *
1513 got_privsep_send_tree(struct imsgbuf *ibuf,
1514     struct got_parsed_tree_entry *entries, int nentries)
1515 {
1516 	const struct got_error *err = NULL;
1517 	struct got_imsg_tree_object itree;
1518 
1519 	memset(&itree, 0, sizeof(itree));
1520 	itree.nentries = nentries;
1521 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1522 	    == -1)
1523 		return got_error_from_errno("imsg_compose TREE");
1524 
1525 	err = send_tree_entries(ibuf, entries, nentries);
1526 	if (err)
1527 		return err;
1528 
1529 	return flush_imsg(ibuf);
1530 }
1531 
1532 
1533 static const struct got_error *
1534 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1535     int *nentries)
1536 {
1537 	const struct got_error *err = NULL;
1538 	struct got_imsg_tree_entries *ientries;
1539 	struct got_tree_entry *te;
1540 	size_t te_offset;
1541 	size_t i;
1542 
1543 	if (datalen <= sizeof(*ientries) ||
1544 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1545 		return got_error(GOT_ERR_PRIVSEP_LEN);
1546 
1547 	ientries = (struct got_imsg_tree_entries *)data;
1548 	if (ientries->nentries > INT_MAX) {
1549 		return got_error_msg(GOT_ERR_NO_SPACE,
1550 		    "too many tree entries");
1551 	}
1552 
1553 	te_offset = sizeof(*ientries);
1554 	for (i = 0; i < ientries->nentries; i++) {
1555 		struct got_imsg_tree_entry ite;
1556 		const char *te_name;
1557 		uint8_t *buf = (uint8_t *)data + te_offset;
1558 
1559 		if (te_offset >= datalen) {
1560 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1561 			break;
1562 		}
1563 
1564 		/* Might not be aligned, size is ~32 bytes. */
1565 		memcpy(&ite, buf, sizeof(ite));
1566 
1567 		if (ite.namelen >= sizeof(te->name)) {
1568 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1569 			break;
1570 		}
1571 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1572 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1573 			break;
1574 		}
1575 
1576 		if (*nentries >= tree->nentries) {
1577 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1578 			break;
1579 		}
1580 		te = &tree->entries[*nentries];
1581 		te_name = buf + sizeof(ite);
1582 		memcpy(te->name, te_name, ite.namelen);
1583 		te->name[ite.namelen] = '\0';
1584 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1585 		te->mode = ite.mode;
1586 		te->idx = *nentries;
1587 		(*nentries)++;
1588 
1589 		te_offset += sizeof(ite) + ite.namelen;
1590 	}
1591 
1592 	return err;
1593 }
1594 
1595 const struct got_error *
1596 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1597 {
1598 	const struct got_error *err = NULL;
1599 	const size_t min_datalen =
1600 	    MIN(sizeof(struct got_imsg_error),
1601 	    sizeof(struct got_imsg_tree_object));
1602 	struct got_imsg_tree_object *itree;
1603 	int nentries = 0;
1604 
1605 	*tree = NULL;
1606 
1607 	while (*tree == NULL || nentries < (*tree)->nentries) {
1608 		struct imsg imsg;
1609 		size_t datalen;
1610 
1611 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1612 		if (err)
1613 			break;
1614 
1615 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1616 
1617 		switch (imsg.hdr.type) {
1618 		case GOT_IMSG_TREE:
1619 			/* This message should only appear once. */
1620 			if (*tree != NULL) {
1621 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1622 				break;
1623 			}
1624 			if (datalen != sizeof(*itree)) {
1625 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1626 				break;
1627 			}
1628 			itree = imsg.data;
1629 			if (itree->nentries < 0) {
1630 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1631 				break;
1632 			}
1633 			*tree = malloc(sizeof(**tree));
1634 			if (*tree == NULL) {
1635 				err = got_error_from_errno("malloc");
1636 				break;
1637 			}
1638 			(*tree)->entries = calloc(itree->nentries,
1639 			    sizeof(struct got_tree_entry));
1640 			if ((*tree)->entries == NULL) {
1641 				err = got_error_from_errno("malloc");
1642 				free(*tree);
1643 				*tree = NULL;
1644 				break;
1645 			}
1646 			(*tree)->nentries = itree->nentries;
1647 			(*tree)->refcnt = 0;
1648 			break;
1649 		case GOT_IMSG_TREE_ENTRIES:
1650 			/* This message should be preceeded by GOT_IMSG_TREE. */
1651 			if (*tree == NULL) {
1652 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1653 				break;
1654 			}
1655 			err = recv_tree_entries(imsg.data, datalen,
1656 			    *tree, &nentries);
1657 			break;
1658 		default:
1659 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1660 			break;
1661 		}
1662 
1663 		imsg_free(&imsg);
1664 		if (err)
1665 			break;
1666 	}
1667 
1668 	if (*tree && (*tree)->nentries != nentries) {
1669 		if (err == NULL)
1670 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1671 		got_object_tree_close(*tree);
1672 		*tree = NULL;
1673 	}
1674 
1675 	return err;
1676 }
1677 
1678 const struct got_error *
1679 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1680     const uint8_t *data)
1681 {
1682 	struct got_imsg_blob iblob;
1683 
1684 	memset(&iblob, 0, sizeof(iblob));
1685 	iblob.size = size;
1686 	iblob.hdrlen = hdrlen;
1687 
1688 	if (data) {
1689 		uint8_t *buf;
1690 
1691 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1692 			return got_error(GOT_ERR_NO_SPACE);
1693 
1694 		buf = malloc(sizeof(iblob) + size);
1695 		if (buf == NULL)
1696 			return got_error_from_errno("malloc");
1697 
1698 		memcpy(buf, &iblob, sizeof(iblob));
1699 		memcpy(buf + sizeof(iblob), data, size);
1700 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1701 		    sizeof(iblob) + size) == -1) {
1702 			free(buf);
1703 			return got_error_from_errno("imsg_compose BLOB");
1704 		}
1705 		free(buf);
1706 	} else {
1707 		/* Data has already been written to file descriptor. */
1708 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1709 		    sizeof(iblob)) == -1)
1710 			return got_error_from_errno("imsg_compose BLOB");
1711 	}
1712 
1713 
1714 	return flush_imsg(ibuf);
1715 }
1716 
1717 const struct got_error *
1718 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1719     struct imsgbuf *ibuf)
1720 {
1721 	const struct got_error *err = NULL;
1722 	struct imsg imsg;
1723 	struct got_imsg_blob *iblob;
1724 	size_t datalen;
1725 
1726 	*outbuf = NULL;
1727 
1728 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1729 	if (err)
1730 		return err;
1731 
1732 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1733 
1734 	switch (imsg.hdr.type) {
1735 	case GOT_IMSG_BLOB:
1736 		if (datalen < sizeof(*iblob)) {
1737 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1738 			break;
1739 		}
1740 		iblob = imsg.data;
1741 		*size = iblob->size;
1742 		*hdrlen = iblob->hdrlen;
1743 
1744 		if (datalen == sizeof(*iblob)) {
1745 			/* Data has been written to file descriptor. */
1746 			break;
1747 		}
1748 
1749 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1750 		    *size > datalen + sizeof(*iblob)) {
1751 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1752 			break;
1753 		}
1754 
1755 		*outbuf = malloc(*size);
1756 		if (*outbuf == NULL) {
1757 			err = got_error_from_errno("malloc");
1758 			break;
1759 		}
1760 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1761 		break;
1762 	default:
1763 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1764 		break;
1765 	}
1766 
1767 	imsg_free(&imsg);
1768 
1769 	return err;
1770 }
1771 
1772 static const struct got_error *
1773 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1774 {
1775 	const struct got_error *err = NULL;
1776 	size_t offset, remain;
1777 
1778 	offset = 0;
1779 	remain = tagmsg_len;
1780 	while (remain > 0) {
1781 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1782 
1783 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1784 		    tag->tagmsg + offset, n) == -1) {
1785 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1786 			break;
1787 		}
1788 
1789 		err = flush_imsg(ibuf);
1790 		if (err)
1791 			break;
1792 
1793 		offset += n;
1794 		remain -= n;
1795 	}
1796 
1797 	return err;
1798 }
1799 
1800 const struct got_error *
1801 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1802 {
1803 	const struct got_error *err = NULL;
1804 	struct got_imsg_tag_object *itag;
1805 	uint8_t *buf;
1806 	size_t len, total;
1807 	size_t tag_len = strlen(tag->tag);
1808 	size_t tagger_len = strlen(tag->tagger);
1809 	size_t tagmsg_len = strlen(tag->tagmsg);
1810 
1811 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1812 
1813 	buf = malloc(total);
1814 	if (buf == NULL)
1815 		return got_error_from_errno("malloc");
1816 
1817 	itag = (struct got_imsg_tag_object *)buf;
1818 	memcpy(&itag->id, &tag->id, sizeof(itag->id));
1819 	itag->obj_type = tag->obj_type;
1820 	itag->tag_len = tag_len;
1821 	itag->tagger_len = tagger_len;
1822 	itag->tagger_time = tag->tagger_time;
1823 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1824 	itag->tagmsg_len = tagmsg_len;
1825 
1826 	len = sizeof(*itag);
1827 	memcpy(buf + len, tag->tag, tag_len);
1828 	len += tag_len;
1829 	memcpy(buf + len, tag->tagger, tagger_len);
1830 	len += tagger_len;
1831 
1832 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1833 		err = got_error_from_errno("imsg_compose TAG");
1834 		goto done;
1835 	}
1836 
1837 	if (tagmsg_len == 0 ||
1838 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1839 		err = flush_imsg(ibuf);
1840 		if (err)
1841 			goto done;
1842 	}
1843 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1844 done:
1845 	free(buf);
1846 	return err;
1847 }
1848 
1849 const struct got_error *
1850 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1851 {
1852 	const struct got_error *err = NULL;
1853 	struct imsg imsg;
1854 	struct got_imsg_tag_object *itag;
1855 	size_t len, datalen;
1856 	const size_t min_datalen =
1857 	    MIN(sizeof(struct got_imsg_error),
1858 	    sizeof(struct got_imsg_tag_object));
1859 
1860 	*tag = NULL;
1861 
1862 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1863 	if (err)
1864 		return err;
1865 
1866 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1867 	len = 0;
1868 
1869 	switch (imsg.hdr.type) {
1870 	case GOT_IMSG_TAG:
1871 		if (datalen < sizeof(*itag)) {
1872 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1873 			break;
1874 		}
1875 		itag = imsg.data;
1876 		if (datalen != sizeof(*itag) + itag->tag_len +
1877 		    itag->tagger_len) {
1878 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1879 			break;
1880 		}
1881 		len += sizeof(*itag);
1882 
1883 		*tag = calloc(1, sizeof(**tag));
1884 		if (*tag == NULL) {
1885 			err = got_error_from_errno("calloc");
1886 			break;
1887 		}
1888 
1889 		memcpy(&(*tag)->id, &itag->id, sizeof(itag->id));
1890 
1891 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1892 		if ((*tag)->tag == NULL) {
1893 			err = got_error_from_errno("strndup");
1894 			break;
1895 		}
1896 		len += itag->tag_len;
1897 
1898 		(*tag)->obj_type = itag->obj_type;
1899 		(*tag)->tagger_time = itag->tagger_time;
1900 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1901 
1902 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1903 		if ((*tag)->tagger == NULL) {
1904 			err = got_error_from_errno("strndup");
1905 			break;
1906 		}
1907 		len += itag->tagger_len;
1908 
1909 		if (itag->tagmsg_len == 0) {
1910 			(*tag)->tagmsg = strdup("");
1911 			if ((*tag)->tagmsg == NULL) {
1912 				err = got_error_from_errno("strdup");
1913 				break;
1914 			}
1915 		} else {
1916 			size_t offset = 0, remain = itag->tagmsg_len;
1917 
1918 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1919 			if ((*tag)->tagmsg == NULL) {
1920 				err = got_error_from_errno("malloc");
1921 				break;
1922 			}
1923 			while (remain > 0) {
1924 				struct imsg imsg_log;
1925 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1926 				    remain);
1927 
1928 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1929 				if (err)
1930 					return err;
1931 
1932 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1933 					return got_error(GOT_ERR_PRIVSEP_MSG);
1934 
1935 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1936 				    n);
1937 				imsg_free(&imsg_log);
1938 				offset += n;
1939 				remain -= n;
1940 			}
1941 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1942 		}
1943 
1944 		break;
1945 	default:
1946 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1947 		break;
1948 	}
1949 
1950 	imsg_free(&imsg);
1951 
1952 	return err;
1953 }
1954 
1955 const struct got_error *
1956 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1957     struct got_packidx *packidx)
1958 {
1959 	const struct got_error *err = NULL;
1960 	struct got_imsg_packidx ipackidx;
1961 	struct got_imsg_pack ipack;
1962 	int fd;
1963 
1964 	memset(&ipackidx, 0, sizeof(ipackidx));
1965 	memset(&ipack, 0, sizeof(ipack));
1966 
1967 	ipackidx.len = packidx->len;
1968 	ipackidx.packfile_size = pack->filesize;
1969 	fd = dup(packidx->fd);
1970 	if (fd == -1)
1971 		return got_error_from_errno("dup");
1972 
1973 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1974 	    sizeof(ipackidx)) == -1) {
1975 		err = got_error_from_errno("imsg_compose PACKIDX");
1976 		close(fd);
1977 		return err;
1978 	}
1979 
1980 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1981 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1982 		return got_error(GOT_ERR_NO_SPACE);
1983 	ipack.filesize = pack->filesize;
1984 
1985 	fd = dup(pack->fd);
1986 	if (fd == -1)
1987 		return got_error_from_errno("dup");
1988 
1989 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1990 	    == -1) {
1991 		err = got_error_from_errno("imsg_compose PACK");
1992 		close(fd);
1993 		return err;
1994 	}
1995 
1996 	return flush_imsg(ibuf);
1997 }
1998 
1999 const struct got_error *
2000 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
2001     struct got_object_id *id)
2002 {
2003 	struct got_imsg_packed_object iobj;
2004 
2005 	memset(&iobj, 0, sizeof(iobj));
2006 	iobj.idx = idx;
2007 	memcpy(&iobj.id, id, sizeof(iobj.id));
2008 
2009 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2010 	    &iobj, sizeof(iobj)) == -1)
2011 		return got_error_from_errno("imsg_compose "
2012 		    "PACKED_OBJECT_REQUEST");
2013 
2014 	return flush_imsg(ibuf);
2015 }
2016 
2017 const struct got_error *
2018 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2019     struct got_object_id *id)
2020 {
2021 	struct got_imsg_packed_object iobj;
2022 
2023 	memset(&iobj, 0, sizeof(iobj));
2024 	iobj.idx = idx;
2025 	memcpy(&iobj.id, id, sizeof(iobj.id));
2026 
2027 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2028 	    &iobj, sizeof(iobj)) == -1)
2029 		return got_error_from_errno("imsg_compose "
2030 		    "PACKED_OBJECT_REQUEST");
2031 
2032 	return flush_imsg(ibuf);
2033 }
2034 
2035 const struct got_error *
2036 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2037 {
2038 	const struct got_error *err = NULL;
2039 
2040 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2041 	    NULL, 0) == -1) {
2042 		err = got_error_from_errno("imsg_compose "
2043 		    "GITCONFIG_PARSE_REQUEST");
2044 		close(fd);
2045 		return err;
2046 	}
2047 
2048 	return flush_imsg(ibuf);
2049 }
2050 
2051 const struct got_error *
2052 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2053 {
2054 	if (imsg_compose(ibuf,
2055 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2056 	    NULL, 0) == -1)
2057 		return got_error_from_errno("imsg_compose "
2058 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2059 
2060 	return flush_imsg(ibuf);
2061 }
2062 
2063 const struct got_error *
2064 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2065 {
2066 	if (imsg_compose(ibuf,
2067 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2068 	    NULL, 0) == -1)
2069 		return got_error_from_errno("imsg_compose "
2070 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2071 
2072 	return flush_imsg(ibuf);
2073 }
2074 
2075 
2076 const struct got_error *
2077 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2078 {
2079 	if (imsg_compose(ibuf,
2080 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2081 		return got_error_from_errno("imsg_compose "
2082 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2083 
2084 	return flush_imsg(ibuf);
2085 }
2086 
2087 const struct got_error *
2088 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2089 {
2090 	if (imsg_compose(ibuf,
2091 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2092 		return got_error_from_errno("imsg_compose "
2093 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2094 
2095 	return flush_imsg(ibuf);
2096 }
2097 
2098 const struct got_error *
2099 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2100 {
2101 	if (imsg_compose(ibuf,
2102 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2103 		return got_error_from_errno("imsg_compose "
2104 		    "GITCONFIG_REMOTE_REQUEST");
2105 
2106 	return flush_imsg(ibuf);
2107 }
2108 
2109 const struct got_error *
2110 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2111 {
2112 	if (imsg_compose(ibuf,
2113 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2114 		return got_error_from_errno("imsg_compose "
2115 		    "GITCONFIG_OWNER_REQUEST");
2116 
2117 	return flush_imsg(ibuf);
2118 }
2119 
2120 const struct got_error *
2121 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2122 {
2123 	const struct got_error *err = NULL;
2124 	struct imsg imsg;
2125 	size_t datalen;
2126 
2127 	*str = NULL;
2128 
2129 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2130 	if (err)
2131 		return err;
2132 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2133 
2134 	switch (imsg.hdr.type) {
2135 	case GOT_IMSG_GITCONFIG_STR_VAL:
2136 		if (datalen == 0)
2137 			break;
2138 		*str = strndup(imsg.data, datalen);
2139 		if (*str == NULL) {
2140 			err = got_error_from_errno("strndup");
2141 			break;
2142 		}
2143 		break;
2144 	default:
2145 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2146 		break;
2147 	}
2148 
2149 	imsg_free(&imsg);
2150 	return err;
2151 }
2152 
2153 const struct got_error *
2154 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2155 {
2156 	const struct got_error *err = NULL;
2157 	struct got_imsg_gitconfig_pair p;
2158 	struct imsg imsg;
2159 	size_t datalen;
2160 	uint8_t *data;
2161 
2162 	*key = *val = NULL;
2163 
2164 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2165 	if (err)
2166 		return err;
2167 
2168 	data = imsg.data;
2169 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2170 
2171 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2172 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2173 		goto done;
2174 	}
2175 
2176 	if (datalen < sizeof(p)) {
2177 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2178 		goto done;
2179 	}
2180 
2181 	memcpy(&p, data, sizeof(p));
2182 	data += sizeof(p);
2183 
2184 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2185 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2186 		goto done;
2187 	}
2188 
2189 	*key = strndup(data, p.klen);
2190 	if (*key == NULL) {
2191 		err = got_error_from_errno("strndup");
2192 		goto done;
2193 	}
2194 	data += p.klen;
2195 
2196 	*val = strndup(data, p.vlen);
2197 	if (*val == NULL) {
2198 		err = got_error_from_errno("strndup");
2199 		goto done;
2200 	}
2201 
2202 done:
2203 	imsg_free(&imsg);
2204 	return err;
2205 }
2206 
2207 const struct got_error *
2208 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2209 {
2210 	const struct got_error *err = NULL;
2211 	struct imsg imsg;
2212 	size_t datalen;
2213 	const size_t min_datalen =
2214 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2215 
2216 	*val = 0;
2217 
2218 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2219 	if (err)
2220 		return err;
2221 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2222 
2223 	switch (imsg.hdr.type) {
2224 	case GOT_IMSG_GITCONFIG_INT_VAL:
2225 		if (datalen != sizeof(*val)) {
2226 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2227 			break;
2228 		}
2229 		memcpy(val, imsg.data, sizeof(*val));
2230 		break;
2231 	default:
2232 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2233 		break;
2234 	}
2235 
2236 	imsg_free(&imsg);
2237 	return err;
2238 }
2239 
2240 static void
2241 free_remote_data(struct got_remote_repo *remote)
2242 {
2243 	int i;
2244 
2245 	free(remote->name);
2246 	free(remote->fetch_url);
2247 	free(remote->send_url);
2248 	for (i = 0; i < remote->nfetch_branches; i++)
2249 		free(remote->fetch_branches[i]);
2250 	free(remote->fetch_branches);
2251 	for (i = 0; i < remote->nsend_branches; i++)
2252 		free(remote->send_branches[i]);
2253 	free(remote->send_branches);
2254 	for (i = 0; i < remote->nfetch_refs; i++)
2255 		free(remote->fetch_refs[i]);
2256 	free(remote->fetch_refs);
2257 }
2258 
2259 const struct got_error *
2260 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2261     int *nremotes, struct imsgbuf *ibuf)
2262 {
2263 	const struct got_error *err = NULL;
2264 	struct imsg imsg;
2265 	size_t datalen;
2266 	struct got_imsg_remotes iremotes;
2267 	struct got_imsg_remote iremote;
2268 
2269 	*remotes = NULL;
2270 	*nremotes = 0;
2271 	iremotes.nremotes = 0;
2272 
2273 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2274 	if (err)
2275 		return err;
2276 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2277 
2278 	switch (imsg.hdr.type) {
2279 	case GOT_IMSG_GITCONFIG_REMOTES:
2280 		if (datalen != sizeof(iremotes)) {
2281 			imsg_free(&imsg);
2282 			return got_error(GOT_ERR_PRIVSEP_LEN);
2283 		}
2284 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2285 		if (iremotes.nremotes == 0) {
2286 			imsg_free(&imsg);
2287 			return NULL;
2288 		}
2289 		break;
2290 	default:
2291 		imsg_free(&imsg);
2292 		return got_error(GOT_ERR_PRIVSEP_MSG);
2293 	}
2294 
2295 	imsg_free(&imsg);
2296 
2297 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2298 	if (*remotes == NULL)
2299 		return got_error_from_errno("recallocarray");
2300 
2301 	while (*nremotes < iremotes.nremotes) {
2302 		struct got_remote_repo *remote;
2303 
2304 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2305 		if (err)
2306 			break;
2307 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2308 
2309 		switch (imsg.hdr.type) {
2310 		case GOT_IMSG_GITCONFIG_REMOTE:
2311 			remote = &(*remotes)[*nremotes];
2312 			memset(remote, 0, sizeof(*remote));
2313 			if (datalen < sizeof(iremote)) {
2314 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2315 				break;
2316 			}
2317 			memcpy(&iremote, imsg.data, sizeof(iremote));
2318 			if (iremote.name_len == 0 ||
2319 			    iremote.fetch_url_len == 0 ||
2320 			    iremote.send_url_len == 0 ||
2321 			    (sizeof(iremote) + iremote.name_len +
2322 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2323 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2324 				break;
2325 			}
2326 			remote->name = strndup(imsg.data + sizeof(iremote),
2327 			    iremote.name_len);
2328 			if (remote->name == NULL) {
2329 				err = got_error_from_errno("strndup");
2330 				break;
2331 			}
2332 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2333 			    iremote.name_len, iremote.fetch_url_len);
2334 			if (remote->fetch_url == NULL) {
2335 				err = got_error_from_errno("strndup");
2336 				free_remote_data(remote);
2337 				break;
2338 			}
2339 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2340 			    iremote.name_len + iremote.fetch_url_len,
2341 			    iremote.send_url_len);
2342 			if (remote->send_url == NULL) {
2343 				err = got_error_from_errno("strndup");
2344 				free_remote_data(remote);
2345 				break;
2346 			}
2347 			remote->mirror_references = iremote.mirror_references;
2348 			remote->fetch_all_branches = iremote.fetch_all_branches;
2349 			remote->nfetch_branches = 0;
2350 			remote->fetch_branches = NULL;
2351 			remote->nsend_branches = 0;
2352 			remote->send_branches = NULL;
2353 			remote->nfetch_refs = 0;
2354 			remote->fetch_refs = NULL;
2355 			(*nremotes)++;
2356 			break;
2357 		default:
2358 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2359 			break;
2360 		}
2361 
2362 		imsg_free(&imsg);
2363 		if (err)
2364 			break;
2365 	}
2366 
2367 	if (err) {
2368 		int i;
2369 		for (i = 0; i < *nremotes; i++)
2370 			free_remote_data(&(*remotes)[i]);
2371 		free(*remotes);
2372 		*remotes = NULL;
2373 		*nremotes = 0;
2374 	}
2375 	return err;
2376 }
2377 
2378 const struct got_error *
2379 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2380 {
2381 	const struct got_error *err = NULL;
2382 
2383 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2384 	    NULL, 0) == -1) {
2385 		err = got_error_from_errno("imsg_compose "
2386 		    "GOTCONFIG_PARSE_REQUEST");
2387 		close(fd);
2388 		return err;
2389 	}
2390 
2391 	return flush_imsg(ibuf);
2392 }
2393 
2394 const struct got_error *
2395 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2396 {
2397 	if (imsg_compose(ibuf,
2398 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2399 		return got_error_from_errno("imsg_compose "
2400 		    "GOTCONFIG_AUTHOR_REQUEST");
2401 
2402 	return flush_imsg(ibuf);
2403 }
2404 
2405 const struct got_error *
2406 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2407 {
2408 	if (imsg_compose(ibuf,
2409 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2410 		return got_error_from_errno("imsg_compose "
2411 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2412 
2413 	return flush_imsg(ibuf);
2414 }
2415 
2416 const struct got_error *
2417 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2418 {
2419 	if (imsg_compose(ibuf,
2420 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2421 		return got_error_from_errno("imsg_compose "
2422 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2423 
2424 	return flush_imsg(ibuf);
2425 }
2426 
2427 const struct got_error *
2428 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2429 {
2430 	if (imsg_compose(ibuf,
2431 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2432 		return got_error_from_errno("imsg_compose "
2433 		    "GOTCONFIG_SIGNERID_REQUEST");
2434 
2435 	return flush_imsg(ibuf);
2436 }
2437 
2438 const struct got_error *
2439 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2440 {
2441 	if (imsg_compose(ibuf,
2442 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2443 		return got_error_from_errno("imsg_compose "
2444 		    "GOTCONFIG_REMOTE_REQUEST");
2445 
2446 	return flush_imsg(ibuf);
2447 }
2448 
2449 const struct got_error *
2450 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2451 {
2452 	const struct got_error *err = NULL;
2453 	struct imsg imsg;
2454 	size_t datalen;
2455 
2456 	*str = NULL;
2457 
2458 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2459 	if (err)
2460 		return err;
2461 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2462 
2463 	switch (imsg.hdr.type) {
2464 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2465 		if (datalen == 0)
2466 			break;
2467 		*str = strndup(imsg.data, datalen);
2468 		if (*str == NULL) {
2469 			err = got_error_from_errno("strndup");
2470 			break;
2471 		}
2472 		break;
2473 	default:
2474 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2475 		break;
2476 	}
2477 
2478 	imsg_free(&imsg);
2479 	return err;
2480 }
2481 
2482 const struct got_error *
2483 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2484     int *nremotes, struct imsgbuf *ibuf)
2485 {
2486 	const struct got_error *err = NULL;
2487 	struct imsg imsg;
2488 	size_t datalen;
2489 	struct got_imsg_remotes iremotes;
2490 	struct got_imsg_remote iremote;
2491 	const size_t min_datalen =
2492 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2493 
2494 	*remotes = NULL;
2495 	*nremotes = 0;
2496 	iremotes.nremotes = 0;
2497 
2498 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2499 	if (err)
2500 		return err;
2501 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2502 
2503 	switch (imsg.hdr.type) {
2504 	case GOT_IMSG_GOTCONFIG_REMOTES:
2505 		if (datalen != sizeof(iremotes)) {
2506 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2507 			break;
2508 		}
2509 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2510 		if (iremotes.nremotes < 0) {
2511 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2512 			break;
2513 		}
2514 		if (iremotes.nremotes == 0) {
2515 			imsg_free(&imsg);
2516 			return NULL;
2517 		}
2518 		break;
2519 	default:
2520 		imsg_free(&imsg);
2521 		return got_error(GOT_ERR_PRIVSEP_MSG);
2522 	}
2523 
2524 	imsg_free(&imsg);
2525 
2526 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2527 	if (*remotes == NULL)
2528 		return got_error_from_errno("recallocarray");
2529 
2530 	while (*nremotes < iremotes.nremotes) {
2531 		struct got_remote_repo *remote;
2532 		const size_t min_datalen =
2533 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2534 		int i;
2535 
2536 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2537 		if (err)
2538 			break;
2539 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2540 
2541 		switch (imsg.hdr.type) {
2542 		case GOT_IMSG_GOTCONFIG_REMOTE:
2543 			remote = &(*remotes)[*nremotes];
2544 			memset(remote, 0, sizeof(*remote));
2545 			if (datalen < sizeof(iremote)) {
2546 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2547 				break;
2548 			}
2549 			memcpy(&iremote, imsg.data, sizeof(iremote));
2550 			if (iremote.name_len == 0 ||
2551 			    (iremote.fetch_url_len == 0 &&
2552 			    iremote.send_url_len == 0) ||
2553 			    (sizeof(iremote) + iremote.name_len +
2554 			    iremote.fetch_url_len + iremote.send_url_len) >
2555 			    datalen) {
2556 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2557 				break;
2558 			}
2559 			remote->name = strndup(imsg.data + sizeof(iremote),
2560 			    iremote.name_len);
2561 			if (remote->name == NULL) {
2562 				err = got_error_from_errno("strndup");
2563 				break;
2564 			}
2565 			remote->fetch_url = strndup(imsg.data +
2566 			    sizeof(iremote) + iremote.name_len,
2567 			    iremote.fetch_url_len);
2568 			if (remote->fetch_url == NULL) {
2569 				err = got_error_from_errno("strndup");
2570 				free_remote_data(remote);
2571 				break;
2572 			}
2573 			remote->send_url = strndup(imsg.data +
2574 			    sizeof(iremote) + iremote.name_len +
2575 			    iremote.fetch_url_len, iremote.send_url_len);
2576 			if (remote->send_url == NULL) {
2577 				err = got_error_from_errno("strndup");
2578 				free_remote_data(remote);
2579 				break;
2580 			}
2581 			remote->mirror_references = iremote.mirror_references;
2582 			remote->fetch_all_branches = iremote.fetch_all_branches;
2583 			if (iremote.nfetch_branches > 0) {
2584 				remote->fetch_branches = recallocarray(NULL, 0,
2585 				    iremote.nfetch_branches, sizeof(char *));
2586 				if (remote->fetch_branches == NULL) {
2587 					err = got_error_from_errno("calloc");
2588 					free_remote_data(remote);
2589 					break;
2590 				}
2591 			}
2592 			remote->nfetch_branches = 0;
2593 			for (i = 0; i < iremote.nfetch_branches; i++) {
2594 				char *branch;
2595 				err = got_privsep_recv_gotconfig_str(&branch,
2596 				    ibuf);
2597 				if (err) {
2598 					free_remote_data(remote);
2599 					goto done;
2600 				}
2601 				remote->fetch_branches[i] = branch;
2602 				remote->nfetch_branches++;
2603 			}
2604 			if (iremote.nsend_branches > 0) {
2605 				remote->send_branches = recallocarray(NULL, 0,
2606 				    iremote.nsend_branches, sizeof(char *));
2607 				if (remote->send_branches == NULL) {
2608 					err = got_error_from_errno("calloc");
2609 					free_remote_data(remote);
2610 					break;
2611 				}
2612 			}
2613 			remote->nsend_branches = 0;
2614 			for (i = 0; i < iremote.nsend_branches; i++) {
2615 				char *branch;
2616 				err = got_privsep_recv_gotconfig_str(&branch,
2617 				    ibuf);
2618 				if (err) {
2619 					free_remote_data(remote);
2620 					goto done;
2621 				}
2622 				remote->send_branches[i] = branch;
2623 				remote->nsend_branches++;
2624 			}
2625 			if (iremote.nfetch_refs > 0) {
2626 				remote->fetch_refs = recallocarray(NULL, 0,
2627 				    iremote.nfetch_refs, sizeof(char *));
2628 				if (remote->fetch_refs == NULL) {
2629 					err = got_error_from_errno("calloc");
2630 					free_remote_data(remote);
2631 					break;
2632 				}
2633 			}
2634 			remote->nfetch_refs = 0;
2635 			for (i = 0; i < iremote.nfetch_refs; i++) {
2636 				char *ref;
2637 				err = got_privsep_recv_gotconfig_str(&ref,
2638 				    ibuf);
2639 				if (err) {
2640 					free_remote_data(remote);
2641 					goto done;
2642 				}
2643 				remote->fetch_refs[i] = ref;
2644 				remote->nfetch_refs++;
2645 			}
2646 			(*nremotes)++;
2647 			break;
2648 		default:
2649 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2650 			break;
2651 		}
2652 
2653 		imsg_free(&imsg);
2654 		if (err)
2655 			break;
2656 	}
2657 done:
2658 	if (err) {
2659 		int i;
2660 		for (i = 0; i < *nremotes; i++)
2661 			free_remote_data(&(*remotes)[i]);
2662 		free(*remotes);
2663 		*remotes = NULL;
2664 		*nremotes = 0;
2665 	}
2666 	return err;
2667 }
2668 
2669 const struct got_error *
2670 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2671     struct got_object_id *id, int idx, const char *path)
2672 {
2673 	struct ibuf *wbuf;
2674 	size_t path_len = strlen(path);
2675 
2676 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2677 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2678 	if (wbuf == NULL)
2679 		return got_error_from_errno(
2680 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2681 	/*
2682 	 * Keep in sync with struct got_imsg_commit_traversal_request
2683 	 * and struct got_imsg_packed_object.
2684 	 */
2685 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
2686 		return got_error_from_errno("imsg_add "
2687 		    "COMMIT_TRAVERSAL_REQUEST");
2688 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2689 		return got_error_from_errno("imsg_add "
2690 		    "COMMIT_TRAVERSAL_REQUEST");
2691 	if (imsg_add(wbuf, &path_len, sizeof(path_len)) == -1)
2692 		return got_error_from_errno("imsg_add "
2693 		    "COMMIT_TRAVERSAL_REQUEST");
2694 	if (imsg_add(wbuf, path, path_len) == -1)
2695 		return got_error_from_errno("imsg_add "
2696 		    "COMMIT_TRAVERSAL_REQUEST");
2697 
2698 	imsg_close(ibuf, wbuf);
2699 	return flush_imsg(ibuf);
2700 }
2701 
2702 const struct got_error *
2703 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2704     struct got_object_id **changed_commit_id,
2705     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2706 {
2707 	const struct got_error *err = NULL;
2708 	struct imsg imsg;
2709 	struct got_imsg_traversed_commits *icommits;
2710 	struct got_object_id *ids;
2711 	size_t datalen;
2712 	int i, done = 0;
2713 
2714 	*changed_commit = NULL;
2715 	*changed_commit_id = NULL;
2716 
2717 	while (!done) {
2718 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2719 		if (err)
2720 			return err;
2721 
2722 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2723 		switch (imsg.hdr.type) {
2724 		case GOT_IMSG_TRAVERSED_COMMITS:
2725 			icommits = imsg.data;
2726 			if (datalen != sizeof(*icommits) +
2727 			    icommits->ncommits * sizeof(*ids)) {
2728 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2729 				break;
2730 			}
2731 			ids = imsg.data + sizeof(*icommits);
2732 			for (i = 0; i < icommits->ncommits; i++) {
2733 				struct got_object_qid *qid;
2734 
2735 				err = got_object_qid_alloc_partial(&qid);
2736 				if (err)
2737 					break;
2738 				memcpy(&qid->id, &ids[i], sizeof(ids[i]));
2739 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2740 
2741 				/* The last commit may contain a change. */
2742 				if (i == icommits->ncommits - 1) {
2743 					*changed_commit_id =
2744 					    got_object_id_dup(&qid->id);
2745 					if (*changed_commit_id == NULL) {
2746 						err = got_error_from_errno(
2747 						    "got_object_id_dup");
2748 						break;
2749 					}
2750 				}
2751 			}
2752 			break;
2753 		case GOT_IMSG_COMMIT:
2754 			if (*changed_commit_id == NULL) {
2755 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2756 				break;
2757 			}
2758 			err = get_commit_from_imsg(changed_commit, &imsg,
2759 			    datalen, ibuf);
2760 			break;
2761 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2762 			done = 1;
2763 			break;
2764 		default:
2765 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2766 			break;
2767 		}
2768 
2769 		imsg_free(&imsg);
2770 		if (err)
2771 			break;
2772 	}
2773 
2774 	if (err)
2775 		got_object_id_queue_free(commit_ids);
2776 	return err;
2777 }
2778 
2779 const struct got_error *
2780 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2781     struct got_object_id *tree_id, const char *path,
2782     struct got_parsed_tree_entry *entries, int nentries)
2783 {
2784 	const struct got_error *err = NULL;
2785 	struct ibuf *wbuf;
2786 	size_t path_len = strlen(path);
2787 	size_t msglen;
2788 
2789 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2790 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2791 	if (wbuf == NULL)
2792 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2793 
2794 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2795 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2796 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2797 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2798 	if (imsg_add(wbuf, path, path_len) == -1)
2799 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2800 
2801 	imsg_close(ibuf, wbuf);
2802 
2803 	if (entries) {
2804 		err = send_tree_entries(ibuf, entries, nentries);
2805 		if (err)
2806 			return err;
2807 	}
2808 
2809 	return flush_imsg(ibuf);
2810 }
2811 
2812 const struct got_error *
2813 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2814 {
2815 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2816 	    0, 0, -1, NULL, 0) == -1)
2817 		return got_error_from_errno("imsg_compose "
2818 		    "OBJECT_ENUMERATION_REQUEST");
2819 
2820 	return flush_imsg(ibuf);
2821 }
2822 
2823 const struct got_error *
2824 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2825 {
2826 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2827 	    0, 0, -1, NULL, 0) == -1)
2828 		return got_error_from_errno("imsg_compose "
2829 		    "OBJECT_ENUMERATION_DONE");
2830 
2831 	return flush_imsg(ibuf);
2832 }
2833 
2834 const struct got_error *
2835 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2836 {
2837 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2838 	    0, 0, -1, NULL, 0) == -1)
2839 		return got_error_from_errno("imsg_compose "
2840 		    "OBJECT_ENUMERATION_INCOMPLETE");
2841 
2842 	return flush_imsg(ibuf);
2843 }
2844 
2845 const struct got_error *
2846 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2847     struct got_object_id *id, time_t mtime)
2848 {
2849 	struct ibuf *wbuf;
2850 
2851 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2852 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2853 	if (wbuf == NULL)
2854 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2855 
2856 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2857 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2858 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2859 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2860 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2861 
2862 	imsg_close(ibuf, wbuf);
2863 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2864 	return NULL;
2865 }
2866 
2867 const struct got_error *
2868 got_privsep_recv_enumerated_objects(int *found_all_objects,
2869     struct imsgbuf *ibuf,
2870     got_object_enumerate_commit_cb cb_commit,
2871     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2872     struct got_repository *repo)
2873 {
2874 	const struct got_error *err = NULL;
2875 	struct imsg imsg;
2876 	struct got_imsg_enumerated_commit *icommit = NULL;
2877 	struct got_object_id commit_id;
2878 	int have_commit = 0;
2879 	time_t mtime = 0;
2880 	struct got_tree_object tree;
2881 	struct got_imsg_enumerated_tree *itree;
2882 	struct got_object_id tree_id;
2883 	char *path = NULL, *canon_path = NULL;
2884 	size_t datalen, path_len;
2885 	int nentries = -1;
2886 	int done = 0;
2887 
2888 	*found_all_objects = 0;
2889 	memset(&tree, 0, sizeof(tree));
2890 
2891 	while (!done) {
2892 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2893 		if (err)
2894 			break;
2895 
2896 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2897 		switch (imsg.hdr.type) {
2898 		case GOT_IMSG_ENUMERATED_COMMIT:
2899 			if (have_commit && nentries != -1) {
2900 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2901 				break;
2902 			}
2903 			if (datalen != sizeof(*icommit)) {
2904 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2905 				break;
2906 			}
2907 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2908 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2909 			mtime = icommit->mtime;
2910 			have_commit = 1;
2911 			break;
2912 		case GOT_IMSG_ENUMERATED_TREE:
2913 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2914 			if (!have_commit) {
2915 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2916 				break;
2917 			}
2918 			if (datalen < sizeof(*itree)) {
2919 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2920 				break;
2921 			}
2922 			itree = imsg.data;
2923 			path_len = datalen - sizeof(*itree);
2924 			if (path_len == 0) {
2925 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2926 				break;
2927 			}
2928 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2929 			free(path);
2930 			path = strndup(imsg.data + sizeof(*itree), path_len);
2931 			if (path == NULL) {
2932 				err = got_error_from_errno("strndup");
2933 				break;
2934 			}
2935 			free(canon_path);
2936 			canon_path = malloc(path_len + 1);
2937 			if (canon_path == NULL) {
2938 				err = got_error_from_errno("malloc");
2939 				break;
2940 			}
2941 			if (!got_path_is_absolute(path)) {
2942 				err = got_error(GOT_ERR_BAD_PATH);
2943 				break;
2944 			}
2945 			if (got_path_is_root_dir(path)) {
2946 				/* XXX check what got_canonpath() does wrong */
2947 				canon_path[0] = '/';
2948 				canon_path[1] = '\0';
2949 			} else {
2950 				err = got_canonpath(path, canon_path,
2951 				    path_len + 1);
2952 				if (err)
2953 					break;
2954 			}
2955 			if (strcmp(path, canon_path) != 0) {
2956 				err = got_error(GOT_ERR_BAD_PATH);
2957 				break;
2958 			}
2959 			if (nentries != -1) {
2960 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2961 				break;
2962 			}
2963 			if (itree->nentries < -1) {
2964 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2965 				break;
2966 			}
2967 			if (itree->nentries == -1) {
2968 				/* Tree was not found in pack file. */
2969 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2970 				    path, repo);
2971 				break;
2972 			}
2973 			if (itree->nentries > INT_MAX) {
2974 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2975 				break;
2976 			}
2977 			tree.entries = calloc(itree->nentries,
2978 			    sizeof(struct got_tree_entry));
2979 			if (tree.entries == NULL) {
2980 				err = got_error_from_errno("calloc");
2981 				break;
2982 			}
2983 			if (itree->nentries == 0) {
2984 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2985 				    path, repo);
2986 				if (err)
2987 					break;
2988 
2989 				/* Prepare for next tree. */
2990 				free(tree.entries);
2991 				memset(&tree, 0, sizeof(tree));
2992 				nentries = -1;
2993 			} else {
2994 				tree.nentries = itree->nentries;
2995 				nentries = 0;
2996 			}
2997 			break;
2998 		case GOT_IMSG_TREE_ENTRIES:
2999 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
3000 			if (nentries <= -1) {
3001 				err = got_error(GOT_ERR_PRIVSEP_MSG);
3002 				break;
3003 			}
3004 			err = recv_tree_entries(imsg.data, datalen,
3005 			    &tree, &nentries);
3006 			if (err)
3007 				break;
3008 			if (tree.nentries == nentries) {
3009 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
3010 				    path, repo);
3011 				if (err)
3012 					break;
3013 
3014 				/* Prepare for next tree. */
3015 				free(tree.entries);
3016 				memset(&tree, 0, sizeof(tree));
3017 				nentries = -1;
3018 			}
3019 			break;
3020 		case GOT_IMSG_TREE_ENUMERATION_DONE:
3021 			/* All trees have been found and traversed. */
3022 			if (!have_commit || path == NULL || nentries != -1) {
3023 				err = got_error(GOT_ERR_PRIVSEP_MSG);
3024 				break;
3025 			}
3026 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
3027 			if (err)
3028 				break;
3029 			have_commit = 0;
3030 			break;
3031 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
3032 			*found_all_objects = 1;
3033 			done = 1;
3034 			break;
3035 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
3036 			done = 1;
3037 			break;
3038 		default:
3039 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3040 			break;
3041 		}
3042 
3043 		imsg_free(&imsg);
3044 		if (err)
3045 			break;
3046 	}
3047 
3048 	free(path);
3049 	free(canon_path);
3050 	free(tree.entries);
3051 	return err;
3052 }
3053 
3054 const struct got_error *
3055 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3056     struct got_object_id *id)
3057 {
3058 	struct got_imsg_raw_delta_request dreq;
3059 
3060 	memset(&dreq, 0, sizeof(dreq));
3061 	dreq.idx = idx;
3062 	memcpy(&dreq.id, id, sizeof(dreq.id));
3063 
3064 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3065 	    &dreq, sizeof(dreq)) == -1)
3066 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3067 
3068 	return flush_imsg(ibuf);
3069 }
3070 
3071 const struct got_error *
3072 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3073 {
3074 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3075 }
3076 
3077 const struct got_error *
3078 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3079     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3080     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3081 {
3082 	struct got_imsg_raw_delta idelta;
3083 	int ret;
3084 
3085 	memset(&idelta, 0, sizeof(idelta));
3086 	idelta.base_size = base_size;
3087 	idelta.result_size = result_size;
3088 	idelta.delta_size = delta_size;
3089 	idelta.delta_compressed_size = delta_compressed_size;
3090 	idelta.delta_offset = delta_offset;
3091 	idelta.delta_out_offset = delta_out_offset;
3092 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3093 
3094 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3095 	    &idelta, sizeof(idelta));
3096 	if (ret == -1)
3097 		return got_error_from_errno("imsg_compose RAW_DELTA");
3098 
3099 	return flush_imsg(ibuf);
3100 }
3101 
3102 const struct got_error *
3103 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3104     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3105     off_t *delta_out_offset, struct got_object_id **base_id,
3106     struct imsgbuf *ibuf)
3107 {
3108 	const struct got_error *err = NULL;
3109 	struct imsg imsg;
3110 	struct got_imsg_raw_delta *delta;
3111 	size_t datalen;
3112 
3113 	*base_size = 0;
3114 	*result_size = 0;
3115 	*delta_size = 0;
3116 	*delta_compressed_size = 0;
3117 	*delta_offset = 0;
3118 	*delta_out_offset = 0;
3119 	*base_id = NULL;
3120 
3121 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3122 	if (err)
3123 		return err;
3124 
3125 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3126 
3127 	switch (imsg.hdr.type) {
3128 	case GOT_IMSG_RAW_DELTA:
3129 		if (datalen != sizeof(*delta)) {
3130 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3131 			break;
3132 		}
3133 		delta = imsg.data;
3134 		*base_size = delta->base_size;
3135 		*result_size = delta->result_size;
3136 		*delta_size = delta->delta_size;
3137 		*delta_compressed_size = delta->delta_compressed_size;
3138 		*delta_offset = delta->delta_offset;
3139 		*delta_out_offset = delta->delta_out_offset;
3140 		*base_id = calloc(1, sizeof(**base_id));
3141 		if (*base_id == NULL) {
3142 			err = got_error_from_errno("malloc");
3143 			break;
3144 		}
3145 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3146 		break;
3147 	default:
3148 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3149 		break;
3150 	}
3151 
3152 	imsg_free(&imsg);
3153 
3154 	if (err) {
3155 		free(*base_id);
3156 		*base_id = NULL;
3157 	}
3158 	return err;
3159 }
3160 
3161 static const struct got_error *
3162 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3163 {
3164 	const struct got_error *err = NULL;
3165 	struct got_imsg_object_idlist idlist;
3166 	struct ibuf *wbuf;
3167 	size_t i;
3168 
3169 	memset(&idlist, 0, sizeof(idlist));
3170 
3171 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3172 		return got_error(GOT_ERR_NO_SPACE);
3173 
3174 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3175 	    sizeof(idlist) + nids * sizeof(**ids));
3176 	if (wbuf == NULL) {
3177 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3178 		return err;
3179 	}
3180 
3181 	idlist.nids = nids;
3182 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3183 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3184 
3185 	for (i = 0; i < nids; i++) {
3186 		struct got_object_id *id = ids[i];
3187 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3188 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3189 	}
3190 
3191 	imsg_close(ibuf, wbuf);
3192 
3193 	return flush_imsg(ibuf);
3194 }
3195 
3196 const struct got_error *
3197 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3198     struct got_object_id **ids, size_t nids)
3199 {
3200 	const struct got_error *err = NULL;
3201 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3202 	int i, queued = 0;
3203 
3204 	for (i = 0; i < nids; i++) {
3205 		idlist[i % nitems(idlist)] = ids[i];
3206 		queued++;
3207 		if (queued >= nitems(idlist)) {
3208 			err = send_idlist(ibuf, idlist, queued);
3209 			if (err)
3210 				return err;
3211 			queued = 0;
3212 		}
3213 	}
3214 
3215 	if (queued > 0) {
3216 		err = send_idlist(ibuf, idlist, queued);
3217 		if (err)
3218 			return err;
3219 	}
3220 
3221 	return NULL;
3222 }
3223 
3224 const struct got_error *
3225 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3226 {
3227 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3228 	    == -1)
3229 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3230 
3231 	return flush_imsg(ibuf);
3232 }
3233 
3234 const struct got_error *
3235 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3236     size_t *nids, struct imsgbuf *ibuf)
3237 {
3238 	const struct got_error *err = NULL;
3239 	struct imsg imsg;
3240 	struct got_imsg_object_idlist *idlist;
3241 	size_t datalen;
3242 
3243 	*ids = NULL;
3244 	*done = 0;
3245 	*nids = 0;
3246 
3247 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3248 	if (err)
3249 		return err;
3250 
3251 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3252 	switch (imsg.hdr.type) {
3253 	case GOT_IMSG_OBJ_ID_LIST:
3254 		if (datalen < sizeof(*idlist)) {
3255 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3256 			break;
3257 		}
3258 		idlist = imsg.data;
3259 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3260 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3261 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3262 			break;
3263 		}
3264 		*nids = idlist->nids;
3265 		*ids = calloc(*nids, sizeof(**ids));
3266 		if (*ids == NULL) {
3267 			err = got_error_from_errno("calloc");
3268 			break;
3269 		}
3270 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3271 		    *nids * sizeof(**ids));
3272 		break;
3273 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3274 		*done = 1;
3275 		break;
3276 	default:
3277 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3278 		break;
3279 	}
3280 
3281 	imsg_free(&imsg);
3282 
3283 	return err;
3284 }
3285 
3286 const struct got_error *
3287 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3288 {
3289 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3290 	    == -1)
3291 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3292 
3293 	return flush_imsg(ibuf);
3294 }
3295 
3296 const struct got_error *
3297 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3298     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3299 {
3300 	const struct got_error *err = NULL;
3301 	struct ibuf *wbuf;
3302 	struct got_imsg_reused_deltas ideltas;
3303 	size_t i;
3304 
3305 	memset(&ideltas, 0, sizeof(ideltas));
3306 
3307 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3308 		return got_error(GOT_ERR_NO_SPACE);
3309 
3310 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3311 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3312 	if (wbuf == NULL) {
3313 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3314 		return err;
3315 	}
3316 
3317 	ideltas.ndeltas = ndeltas;
3318 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3319 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3320 
3321 	for (i = 0; i < ndeltas; i++) {
3322 		struct got_imsg_reused_delta *delta = &deltas[i];
3323 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3324 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3325 	}
3326 
3327 	imsg_close(ibuf, wbuf);
3328 
3329 	return flush_imsg(ibuf);
3330 }
3331 
3332 const struct got_error *
3333 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3334 {
3335 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3336 	    == -1)
3337 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3338 
3339 	return flush_imsg(ibuf);
3340 }
3341 
3342 const struct got_error *
3343 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3344     size_t *ndeltas, struct imsgbuf *ibuf)
3345 {
3346 	const struct got_error *err = NULL;
3347 	struct imsg imsg;
3348 	struct got_imsg_reused_deltas *ideltas;
3349 	size_t datalen;
3350 
3351 	*done = 0;
3352 	*ndeltas = 0;
3353 
3354 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3355 	if (err)
3356 		return err;
3357 
3358 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3359 	switch (imsg.hdr.type) {
3360 	case GOT_IMSG_REUSED_DELTAS:
3361 		if (datalen < sizeof(*ideltas)) {
3362 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3363 			break;
3364 		}
3365 		ideltas = imsg.data;
3366 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3367 		    ideltas->ndeltas * sizeof(*deltas) >
3368 		    datalen - sizeof(*ideltas)) {
3369 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3370 			break;
3371 		}
3372 		*ndeltas = ideltas->ndeltas;
3373 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3374 		    *ndeltas * sizeof(*deltas));
3375 		break;
3376 	case GOT_IMSG_DELTA_REUSE_DONE:
3377 		*done = 1;
3378 		break;
3379 	default:
3380 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3381 		break;
3382 	}
3383 
3384 	imsg_free(&imsg);
3385 
3386 	return err;
3387 }
3388 
3389 const struct got_error *
3390 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3391 {
3392 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3393 	    0, 0, -1, NULL, 0)
3394 	    == -1)
3395 		return got_error_from_errno("imsg_compose "
3396 		    "COMMIT_PAINTING_INIT");
3397 
3398 	return flush_imsg(ibuf);
3399 }
3400 
3401 const struct got_error *
3402 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3403     struct got_object_id *id, intptr_t color)
3404 {
3405 	struct got_imsg_commit_painting_request ireq;
3406 
3407 	memset(&ireq, 0, sizeof(ireq));
3408 	memcpy(&ireq.id, id, sizeof(ireq.id));
3409 	ireq.idx = idx;
3410 	ireq.color = color;
3411 
3412 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3413 	    &ireq, sizeof(ireq)) == -1)
3414 		return got_error_from_errno("imsg_compose "
3415 		    "COMMIT_PAINTING_REQUEST");
3416 
3417 	return flush_imsg(ibuf);
3418 }
3419 
3420 static const struct got_error *
3421 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3422     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3423 {
3424 	const struct got_error *err = NULL;
3425 	struct ibuf *wbuf = NULL;
3426 	struct got_object_qid *qid;
3427 	size_t msglen;
3428 	int ncommits;
3429 	intptr_t color;
3430 
3431 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3432 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3433 	    sizeof(struct got_imsg_painted_commit);
3434 
3435 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3436 	if (wbuf == NULL) {
3437 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3438 		return err;
3439 	}
3440 
3441 	/* Keep in sync with struct got_imsg_painted_commits! */
3442 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3443 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3444 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3445 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3446 
3447 	while (ncommits > 0) {
3448 		qid = STAILQ_FIRST(ids);
3449 		STAILQ_REMOVE_HEAD(ids, entry);
3450 		ncommits--;
3451 		(*nids)--;
3452 		color = (intptr_t)qid->data;
3453 
3454 		/* Keep in sync with struct got_imsg_painted_commit! */
3455 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3456 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3457 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3458 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3459 
3460 		got_object_qid_free(qid);
3461 	}
3462 
3463 	imsg_close(ibuf, wbuf);
3464 	return flush_imsg(ibuf);
3465 }
3466 
3467 const struct got_error *
3468 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3469     struct got_object_id_queue *ids, int *nids,
3470     int present_in_pack, int flush)
3471 {
3472 	const struct got_error *err;
3473 	size_t remain;
3474 
3475 	if (*nids <= 0)
3476 		return NULL;
3477 
3478 	do {
3479 		remain = (sizeof(struct got_imsg_painted_commits)) +
3480 		    *nids * sizeof(struct got_imsg_painted_commit);
3481 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3482 			err = send_painted_commits(ids, nids, remain,
3483 			    present_in_pack, ibuf);
3484 			if (err)
3485 				return err;
3486 		}
3487 	} while (flush && *nids > 0);
3488 
3489 	return NULL;
3490 }
3491 
3492 const struct got_error *
3493 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3494 {
3495 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3496 	    0, 0, -1, NULL, 0)
3497 	    == -1)
3498 		return got_error_from_errno("imsg_compose "
3499 		    "COMMIT_PAINTING_DONE");
3500 
3501 	return flush_imsg(ibuf);
3502 }
3503 
3504 const struct got_error *
3505 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3506     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3507 {
3508 	const struct got_error *err = NULL;
3509 	struct imsg imsg;
3510 	struct got_imsg_painted_commits icommits;
3511 	struct got_imsg_painted_commit icommit;
3512 	size_t datalen;
3513 	int i;
3514 
3515 	for (;;) {
3516 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3517 		if (err)
3518 			return err;
3519 
3520 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3521 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE) {
3522 			imsg_free(&imsg);
3523 			return NULL;
3524 		}
3525 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS){
3526 			imsg_free(&imsg);
3527 			return got_error(GOT_ERR_PRIVSEP_MSG);
3528 		}
3529 
3530 		if (datalen < sizeof(icommits)){
3531 			imsg_free(&imsg);
3532 			return got_error(GOT_ERR_PRIVSEP_LEN);
3533 		}
3534 		memcpy(&icommits, imsg.data, sizeof(icommits));
3535 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3536 		    datalen < sizeof(icommits) +
3537 		    icommits.ncommits * sizeof(icommit)){
3538 			imsg_free(&imsg);
3539 			return got_error(GOT_ERR_PRIVSEP_LEN);
3540 		}
3541 
3542 		for (i = 0; i < icommits.ncommits; i++) {
3543 			memcpy(&icommit,
3544 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3545 			    sizeof(icommit));
3546 
3547 			if (icommits.present_in_pack) {
3548 				struct got_object_id id;
3549 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3550 				err = cb(cb_arg, &id, icommit.color);
3551 				if (err)
3552 					break;
3553 			} else {
3554 				struct got_object_qid *qid;
3555 				err = got_object_qid_alloc_partial(&qid);
3556 				if (err)
3557 					break;
3558 				memcpy(qid->id.sha1, icommit.id,
3559 				    SHA1_DIGEST_LENGTH);
3560 				qid->data = (void *)icommit.color;
3561 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3562 			}
3563 		}
3564 
3565 		imsg_free(&imsg);
3566 		if (err)
3567 			return err;
3568 	}
3569 }
3570 
3571 const struct got_error *
3572 got_privsep_unveil_exec_helpers(void)
3573 {
3574 	const char *helpers[] = {
3575 	    GOT_PATH_PROG_READ_PACK,
3576 	    GOT_PATH_PROG_READ_OBJECT,
3577 	    GOT_PATH_PROG_READ_COMMIT,
3578 	    GOT_PATH_PROG_READ_TREE,
3579 	    GOT_PATH_PROG_READ_BLOB,
3580 	    GOT_PATH_PROG_READ_TAG,
3581 	    GOT_PATH_PROG_READ_GITCONFIG,
3582 	    GOT_PATH_PROG_READ_GOTCONFIG,
3583 	    GOT_PATH_PROG_READ_PATCH,
3584 	    GOT_PATH_PROG_FETCH_PACK,
3585 	    GOT_PATH_PROG_INDEX_PACK,
3586 	    GOT_PATH_PROG_SEND_PACK,
3587 	};
3588 	size_t i;
3589 
3590 	for (i = 0; i < nitems(helpers); i++) {
3591 		if (unveil(helpers[i], "x") == 0)
3592 			continue;
3593 		return got_error_from_errno2("unveil", helpers[i]);
3594 	}
3595 
3596 	return NULL;
3597 }
3598 
3599 void
3600 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3601 {
3602 	if (close(imsg_fds[0]) == -1) {
3603 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3604 		_exit(1);
3605 	}
3606 
3607 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3608 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3609 		_exit(1);
3610 	}
3611 
3612 	closefrom(GOT_IMSG_FD_CHILD + 1);
3613 
3614 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3615 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3616 		    strerror(errno));
3617 		_exit(1);
3618 	}
3619 }