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 <unistd.h>
35 #include <zlib.h>
36 
37 #include "got_object.h"
38 #include "got_error.h"
39 #include "got_path.h"
40 #include "got_repository.h"
41 
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49 #include "got_lib_poll.h"
50 
51 #include "got_privsep.h"
52 
53 #ifndef MIN
54 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 #endif
56 
57 #ifndef nitems
58 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
59 #endif
60 
61 static const struct got_error *
62 read_imsg(struct imsgbuf *ibuf)
63 {
64 	const struct got_error *err;
65 	size_t n;
66 
67 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
68 	if (err) {
69 		if (err->code == GOT_ERR_EOF)
70 			return got_error(GOT_ERR_PRIVSEP_PIPE);
71 		return err;
72 	}
73 
74 	n = imsg_read(ibuf);
75 	if (n == -1) {
76 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
77 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
78 		return got_error(GOT_ERR_PRIVSEP_READ);
79 	}
80 	if (n == 0)
81 		return got_error(GOT_ERR_PRIVSEP_PIPE);
82 
83 	return NULL;
84 }
85 
86 const struct got_error *
87 got_privsep_wait_for_child(pid_t pid)
88 {
89 	int child_status;
90 
91 	if (waitpid(pid, &child_status, 0) == -1)
92 		return got_error_from_errno("waitpid");
93 
94 	if (!WIFEXITED(child_status))
95 		return got_error(GOT_ERR_PRIVSEP_DIED);
96 
97 	if (WEXITSTATUS(child_status) != 0)
98 		return got_error(GOT_ERR_PRIVSEP_EXIT);
99 
100 	return NULL;
101 }
102 
103 static const struct got_error *
104 recv_imsg_error(struct imsg *imsg, size_t datalen)
105 {
106 	struct got_imsg_error *ierr;
107 
108 	if (datalen != sizeof(*ierr))
109 		return got_error(GOT_ERR_PRIVSEP_LEN);
110 
111 	ierr = imsg->data;
112 	if (ierr->code == GOT_ERR_ERRNO) {
113 		static struct got_error serr;
114 		serr.code = GOT_ERR_ERRNO;
115 		serr.msg = strerror(ierr->errno_code);
116 		return &serr;
117 	}
118 
119 	return got_error(ierr->code);
120 }
121 
122 const struct got_error *
123 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
124     size_t min_datalen)
125 {
126 	const struct got_error *err;
127 	ssize_t n;
128 
129 	n = imsg_get(ibuf, imsg);
130 	if (n == -1)
131 		return got_error_from_errno("imsg_get");
132 
133 	while (n == 0) {
134 		err = read_imsg(ibuf);
135 		if (err)
136 			return err;
137 		n = imsg_get(ibuf, imsg);
138 		if (n == -1)
139 			return got_error_from_errno("imsg_get");
140 	}
141 
142 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
143 		return got_error(GOT_ERR_PRIVSEP_LEN);
144 
145 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
146 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
147 		return recv_imsg_error(imsg, datalen);
148 	}
149 
150 	return NULL;
151 }
152 
153 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
154 void
155 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
156 {
157 	const struct got_error *poll_err;
158 	struct got_imsg_error ierr;
159 	int ret;
160 
161 	ierr.code = err->code;
162 	if (err->code == GOT_ERR_ERRNO)
163 		ierr.errno_code = errno;
164 	else
165 		ierr.errno_code = 0;
166 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
167 	if (ret == -1) {
168 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
169 		    getprogname(), err->code, err->msg, strerror(errno));
170 		return;
171 	}
172 
173 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
174 	if (poll_err) {
175 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
176 		    getprogname(), err->code, err->msg, poll_err->msg);
177 		return;
178 	}
179 
180 	ret = imsg_flush(ibuf);
181 	if (ret == -1) {
182 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
183 		    getprogname(), err->code, err->msg, strerror(errno));
184 		imsg_clear(ibuf);
185 		return;
186 	}
187 }
188 
189 static const struct got_error *
190 flush_imsg(struct imsgbuf *ibuf)
191 {
192 	const struct got_error *err;
193 
194 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
195 	if (err)
196 		return err;
197 
198 	if (imsg_flush(ibuf) == -1) {
199 		imsg_clear(ibuf);
200 		return got_error_from_errno("imsg_flush");
201 	}
202 
203 	return NULL;
204 }
205 
206 const struct got_error *
207 got_privsep_flush_imsg(struct imsgbuf *ibuf)
208 {
209 	return flush_imsg(ibuf);
210 }
211 
212 const struct got_error *
213 got_privsep_send_stop(int fd)
214 {
215 	const struct got_error *err = NULL;
216 	struct imsgbuf ibuf;
217 
218 	imsg_init(&ibuf, fd);
219 
220 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
221 		return got_error_from_errno("imsg_compose STOP");
222 
223 	err = flush_imsg(&ibuf);
224 	return err;
225 }
226 
227 const struct got_error *
228 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
229     struct got_object_id *id)
230 {
231 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
232 	    id, sizeof(*id)) == -1)
233 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
234 
235 	return flush_imsg(ibuf);
236 }
237 
238 const struct got_error *
239 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
240     struct got_object_id *id)
241 {
242 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
243 	    id, sizeof(*id)) == -1)
244 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
245 
246 	return flush_imsg(ibuf);
247 }
248 
249 const struct got_error *
250 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
251 {
252 	const struct got_error *err = NULL;
253 
254 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
255 	    == -1) {
256 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
257 		close(outfd);
258 		return err;
259 	}
260 
261 	return flush_imsg(ibuf);
262 }
263 
264 const struct got_error *
265 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
266     uint8_t *data)
267 {
268 	const struct got_error *err = NULL;
269 	struct got_imsg_raw_obj iobj;
270 	size_t len = sizeof(iobj);
271 	struct ibuf *wbuf;
272 
273 	memset(&iobj, 0, sizeof(iobj));
274 	iobj.hdrlen = hdrlen;
275 	iobj.size = size;
276 
277 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
278 		len += (size_t)size + hdrlen;
279 
280 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
281 	if (wbuf == NULL) {
282 		err = got_error_from_errno("imsg_create RAW_OBJECT");
283 		return err;
284 	}
285 
286 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
287 		return got_error_from_errno("imsg_add RAW_OBJECT");
288 
289 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
290 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
291 			return got_error_from_errno("imsg_add RAW_OBJECT");
292 	}
293 
294 	wbuf->fd = -1;
295 	imsg_close(ibuf, wbuf);
296 
297 	return flush_imsg(ibuf);
298 }
299 
300 const struct got_error *
301 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
302     struct imsgbuf *ibuf)
303 {
304 	const struct got_error *err = NULL;
305 	struct imsg imsg;
306 	struct got_imsg_raw_obj *iobj;
307 	size_t datalen;
308 
309 	*outbuf = NULL;
310 
311 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
312 	if (err)
313 		return err;
314 
315 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
316 
317 	switch (imsg.hdr.type) {
318 	case GOT_IMSG_RAW_OBJECT:
319 		if (datalen < sizeof(*iobj)) {
320 			err = got_error(GOT_ERR_PRIVSEP_LEN);
321 			break;
322 		}
323 		iobj = imsg.data;
324 		*size = iobj->size;
325 		*hdrlen = iobj->hdrlen;
326 
327 		if (datalen == sizeof(*iobj)) {
328 			/* Data has been written to file descriptor. */
329 			break;
330 		}
331 
332 		if (*size < 0 ||
333 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
334 			err = got_error(GOT_ERR_PRIVSEP_LEN);
335 			break;
336 		}
337 
338 		*outbuf = malloc(*size + *hdrlen);
339 		if (*outbuf == NULL) {
340 			err = got_error_from_errno("malloc");
341 			break;
342 		}
343 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
344 		break;
345 	default:
346 		err = got_error(GOT_ERR_PRIVSEP_MSG);
347 		break;
348 	}
349 
350 	imsg_free(&imsg);
351 
352 	return err;
353 }
354 
355 const struct got_error *
356 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
357     struct got_object_id *id, int pack_idx)
358 {
359 	const struct got_error *err = NULL;
360 	struct got_imsg_packed_object iobj;
361 	void *data;
362 	size_t len;
363 
364 	memset(&iobj, 0, sizeof(iobj));
365 	if (pack_idx != -1) { /* commit is packed */
366 		iobj.idx = pack_idx;
367 		memcpy(&iobj.id, id, sizeof(iobj.id));
368 		data = &iobj;
369 		len = sizeof(iobj);
370 	} else {
371 		data = id;
372 		len = sizeof(*id);
373 	}
374 
375 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
376 	    == -1) {
377 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
378 		close(fd);
379 		return err;
380 	}
381 
382 	return flush_imsg(ibuf);
383 }
384 
385 const struct got_error *
386 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
387     struct got_object_id *id, int pack_idx)
388 {
389 	struct ibuf *wbuf;
390 	size_t len;
391 
392 	if (pack_idx != -1)
393 		len = sizeof(struct got_imsg_packed_object);
394 	else
395 		len = sizeof(*id);
396 
397 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
398 	if (wbuf == NULL)
399 		return got_error_from_errno("imsg_create TREE_REQUEST");
400 
401 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
402 		return got_error_from_errno("imsg_add TREE_REQUEST");
403 
404 	if (pack_idx != -1) { /* tree is packed */
405 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
406 			return got_error_from_errno("imsg_add TREE_REQUEST");
407 	}
408 
409 	wbuf->fd = fd;
410 	imsg_close(ibuf, wbuf);
411 
412 	return flush_imsg(ibuf);
413 }
414 
415 const struct got_error *
416 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
417     struct got_object_id *id, int pack_idx)
418 {
419 	struct got_imsg_packed_object iobj;
420 	void *data;
421 	size_t len;
422 
423 	memset(&iobj, 0, sizeof(iobj));
424 	if (pack_idx != -1) { /* tag is packed */
425 		iobj.idx = pack_idx;
426 		memcpy(&iobj.id, id, sizeof(iobj.id));
427 		data = &iobj;
428 		len = sizeof(iobj);
429 	} else {
430 		data = id;
431 		len = sizeof(*id);
432 	}
433 
434 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
435 	    == -1)
436 		return got_error_from_errno("imsg_compose TAG_REQUEST");
437 
438 	return flush_imsg(ibuf);
439 }
440 
441 const struct got_error *
442 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
443     struct got_object_id *id, int pack_idx)
444 {
445 	const struct got_error *err = NULL;
446 	struct got_imsg_packed_object iobj;
447 	void *data;
448 	size_t len;
449 
450 	memset(&iobj, 0, sizeof(iobj));
451 	if (pack_idx != -1) { /* blob is packed */
452 		iobj.idx = pack_idx;
453 		memcpy(&iobj.id, id, sizeof(iobj.id));
454 		data = &iobj;
455 		len = sizeof(iobj);
456 	} else {
457 		data = id;
458 		len = sizeof(*id);
459 	}
460 
461 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
462 	    == -1) {
463 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
464 		close(infd);
465 		return err;
466 	}
467 
468 	return flush_imsg(ibuf);
469 }
470 
471 const struct got_error *
472 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
473 {
474 	const struct got_error *err = NULL;
475 
476 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
477 	    == -1) {
478 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
479 		close(outfd);
480 		return err;
481 	}
482 
483 	return flush_imsg(ibuf);
484 }
485 
486 static const struct got_error *
487 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
488 {
489 	const struct got_error *err = NULL;
490 
491 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
492 		err = got_error_from_errno("imsg_compose TMPFD");
493 		close(fd);
494 		return err;
495 	}
496 
497 	return flush_imsg(ibuf);
498 }
499 
500 const struct got_error *
501 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
502 {
503 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
504 }
505 
506 const struct got_error *
507 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
508 {
509 	struct got_imsg_object iobj;
510 
511 	memset(&iobj, 0, sizeof(iobj));
512 
513 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
514 	iobj.type = obj->type;
515 	iobj.flags = obj->flags;
516 	iobj.hdrlen = obj->hdrlen;
517 	iobj.size = obj->size;
518 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
519 		iobj.pack_offset = obj->pack_offset;
520 		iobj.pack_idx = obj->pack_idx;
521 	}
522 
523 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
524 	    == -1)
525 		return got_error_from_errno("imsg_compose OBJECT");
526 
527 	return flush_imsg(ibuf);
528 }
529 
530 const struct got_error *
531 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
532     struct got_pathlist_head *have_refs, int fetch_all_branches,
533     struct got_pathlist_head *wanted_branches,
534     struct got_pathlist_head *wanted_refs, int list_refs_only,
535     const char *worktree_branch, int no_head, int verbosity)
536 {
537 	const struct got_error *err = NULL;
538 	struct ibuf *wbuf;
539 	size_t len, worktree_branch_len;
540 	struct got_pathlist_entry *pe;
541 	struct got_imsg_fetch_request fetchreq;
542 
543 	if (worktree_branch) {
544 		worktree_branch_len = strlen(worktree_branch);
545 		len = sizeof(fetchreq) + worktree_branch_len;
546 	} else
547 		len = sizeof(fetchreq);
548 
549 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
550 		close(fd);
551 		return got_error(GOT_ERR_NO_SPACE);
552 	}
553 
554 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
555 	if (wbuf == NULL)
556 		return got_error_from_errno("imsg_create FETCH_HAVE_REF");
557 
558 	memset(&fetchreq, 0, sizeof(fetchreq));
559 	fetchreq.no_head = no_head;
560 	fetchreq.fetch_all_branches = fetch_all_branches;
561 	fetchreq.list_refs_only = list_refs_only;
562 	fetchreq.verbosity = verbosity;
563 	if (worktree_branch != NULL)
564 		fetchreq.worktree_branch_len = worktree_branch_len;
565 	TAILQ_FOREACH(pe, have_refs, entry)
566 		fetchreq.n_have_refs++;
567 	TAILQ_FOREACH(pe, wanted_branches, entry)
568 		fetchreq.n_wanted_branches++;
569 	TAILQ_FOREACH(pe, wanted_refs, entry)
570 		fetchreq.n_wanted_refs++;
571 	if (imsg_add(wbuf, &fetchreq, sizeof(fetchreq)) == -1)
572 		return got_error_from_errno("imsg_add FETCH_REQUEST");
573 	if (worktree_branch) {
574 		if (imsg_add(wbuf, worktree_branch, worktree_branch_len) == -1)
575 			return got_error_from_errno("imsg_add FETCH_REQUEST");
576 	}
577 	wbuf->fd = fd;
578 	imsg_close(ibuf, wbuf);
579 
580 	err = flush_imsg(ibuf);
581 	if (err) {
582 		close(fd);
583 		return err;
584 	}
585 	fd = -1;
586 
587 	TAILQ_FOREACH(pe, have_refs, entry) {
588 		const char *name = pe->path;
589 		size_t name_len = pe->path_len;
590 		struct got_object_id *id = pe->data;
591 
592 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
593 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
594 		if (wbuf == NULL)
595 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
596 
597 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
598 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
599 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
600 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
601 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
602 		if (imsg_add(wbuf, name, name_len) == -1)
603 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
604 
605 		wbuf->fd = -1;
606 		imsg_close(ibuf, wbuf);
607 		err = flush_imsg(ibuf);
608 		if (err)
609 			return err;
610 	}
611 
612 	TAILQ_FOREACH(pe, wanted_branches, entry) {
613 		const char *name = pe->path;
614 		size_t name_len = pe->path_len;
615 
616 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
617 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
618 		    len);
619 		if (wbuf == NULL)
620 			return got_error_from_errno(
621 			    "imsg_create FETCH_WANTED_BRANCH");
622 
623 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
624 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
625 			return got_error_from_errno(
626 			    "imsg_add FETCH_WANTED_BRANCH");
627 		if (imsg_add(wbuf, name, name_len) == -1)
628 			return got_error_from_errno(
629 			    "imsg_add FETCH_WANTED_BRANCH");
630 
631 		wbuf->fd = -1;
632 		imsg_close(ibuf, wbuf);
633 		err = flush_imsg(ibuf);
634 		if (err)
635 			return err;
636 	}
637 
638 	TAILQ_FOREACH(pe, wanted_refs, entry) {
639 		const char *name = pe->path;
640 		size_t name_len = pe->path_len;
641 
642 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
643 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
644 		    len);
645 		if (wbuf == NULL)
646 			return got_error_from_errno(
647 			    "imsg_create FETCH_WANTED_REF");
648 
649 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
650 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
651 			return got_error_from_errno(
652 			    "imsg_add FETCH_WANTED_REF");
653 		if (imsg_add(wbuf, name, name_len) == -1)
654 			return got_error_from_errno(
655 			    "imsg_add FETCH_WANTED_REF");
656 
657 		wbuf->fd = -1;
658 		imsg_close(ibuf, wbuf);
659 		err = flush_imsg(ibuf);
660 		if (err)
661 			return err;
662 	}
663 
664 
665 	return NULL;
666 
667 }
668 
669 const struct got_error *
670 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
671 {
672 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
673 }
674 
675 const struct got_error *
676 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
677     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
678     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
679 {
680 	const struct got_error *err = NULL;
681 	struct imsg imsg;
682 	size_t datalen;
683 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
684 	size_t n, remain;
685 	off_t off;
686 	int i;
687 
688 	*done = 0;
689 	*id = NULL;
690 	*refname = NULL;
691 	*server_progress = NULL;
692 	*packfile_size = 0;
693 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
694 
695 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
696 	if (err)
697 		return err;
698 
699 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
700 	switch (imsg.hdr.type) {
701 	case GOT_IMSG_FETCH_SYMREFS:
702 		if (datalen < sizeof(*isymrefs)) {
703 			err = got_error(GOT_ERR_PRIVSEP_LEN);
704 			break;
705 		}
706 		if (isymrefs != NULL) {
707 			err = got_error(GOT_ERR_PRIVSEP_MSG);
708 			break;
709 		}
710 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
711 		off = sizeof(*isymrefs);
712 		remain = datalen - off;
713 		for (n = 0; n < isymrefs->nsymrefs; n++) {
714 			struct got_imsg_fetch_symref *s;
715 			char *name, *target;
716 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
717 				err = got_error(GOT_ERR_PRIVSEP_LEN);
718 				goto done;
719 			}
720 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
721 			off += sizeof(*s);
722 			remain -= sizeof(*s);
723 			if (remain < s->name_len) {
724 				err = got_error(GOT_ERR_PRIVSEP_LEN);
725 				goto done;
726 			}
727 			name = strndup(imsg.data + off, s->name_len);
728 			if (name == NULL) {
729 				err = got_error_from_errno("strndup");
730 				goto done;
731 			}
732 			off += s->name_len;
733 			remain -= s->name_len;
734 			if (remain < s->target_len) {
735 				err = got_error(GOT_ERR_PRIVSEP_LEN);
736 				free(name);
737 				goto done;
738 			}
739 			target = strndup(imsg.data + off, s->target_len);
740 			if (target == NULL) {
741 				err = got_error_from_errno("strndup");
742 				free(name);
743 				goto done;
744 			}
745 			off += s->target_len;
746 			remain -= s->target_len;
747 			err = got_pathlist_append(symrefs, name, target);
748 			if (err) {
749 				free(name);
750 				free(target);
751 				goto done;
752 			}
753 		}
754 		break;
755 	case GOT_IMSG_FETCH_REF:
756 		if (datalen <= sizeof(**id)) {
757 			err = got_error(GOT_ERR_PRIVSEP_MSG);
758 			break;
759 		}
760 		*id = malloc(sizeof(**id));
761 		if (*id == NULL) {
762 			err = got_error_from_errno("malloc");
763 			break;
764 		}
765 		memcpy(*id, imsg.data, sizeof(**id));
766 		*refname = strndup(imsg.data + sizeof(**id),
767 		    datalen - sizeof(**id));
768 		if (*refname == NULL) {
769 			err = got_error_from_errno("strndup");
770 			break;
771 		}
772 		break;
773 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
774 		if (datalen == 0) {
775 			err = got_error(GOT_ERR_PRIVSEP_LEN);
776 			break;
777 		}
778 		*server_progress = strndup(imsg.data, datalen);
779 		if (*server_progress == NULL) {
780 			err = got_error_from_errno("strndup");
781 			break;
782 		}
783 		for (i = 0; i < datalen; i++) {
784 			if (!isprint((unsigned char)(*server_progress)[i]) &&
785 			    !isspace((unsigned char)(*server_progress)[i])) {
786 				err = got_error(GOT_ERR_PRIVSEP_MSG);
787 				free(*server_progress);
788 				*server_progress = NULL;
789 				goto done;
790 			}
791 		}
792 		break;
793 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
794 		if (datalen < sizeof(*packfile_size)) {
795 			err = got_error(GOT_ERR_PRIVSEP_MSG);
796 			break;
797 		}
798 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
799 		break;
800 	case GOT_IMSG_FETCH_DONE:
801 		if (datalen != SHA1_DIGEST_LENGTH) {
802 			err = got_error(GOT_ERR_PRIVSEP_MSG);
803 			break;
804 		}
805 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
806 		*done = 1;
807 		break;
808 	default:
809 		err = got_error(GOT_ERR_PRIVSEP_MSG);
810 		break;
811 	}
812 done:
813 	if (err) {
814 		free(*id);
815 		*id = NULL;
816 		free(*refname);
817 		*refname = NULL;
818 	}
819 	imsg_free(&imsg);
820 	return err;
821 }
822 
823 static const struct got_error *
824 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
825     int delete, struct imsgbuf *ibuf)
826 {
827 	size_t len;
828 	struct ibuf *wbuf;
829 
830 	len = sizeof(struct got_imsg_send_ref) + name_len;
831 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
832 	if (wbuf == NULL)
833 		return got_error_from_errno("imsg_create SEND_REF");
834 
835 	/* Keep in sync with struct got_imsg_send_ref! */
836 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
837 		return got_error_from_errno("imsg_add SEND_REF");
838 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
839 		return got_error_from_errno("imsg_add SEND_REF");
840 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
841 		return got_error_from_errno("imsg_add SEND_REF");
842 	if (imsg_add(wbuf, name, name_len) == -1)
843 		return got_error_from_errno("imsg_add SEND_REF");
844 
845 	wbuf->fd = -1;
846 	imsg_close(ibuf, wbuf);
847 	return flush_imsg(ibuf);
848 }
849 
850 const struct got_error *
851 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
852     struct got_pathlist_head *have_refs,
853     struct got_pathlist_head *delete_refs,
854     int verbosity)
855 {
856 	const struct got_error *err = NULL;
857 	struct got_pathlist_entry *pe;
858 	struct got_imsg_send_request sendreq;
859 	struct got_object_id zero_id;
860 
861 	memset(&zero_id, 0, sizeof(zero_id));
862 	memset(&sendreq, 0, sizeof(sendreq));
863 	sendreq.verbosity = verbosity;
864 	TAILQ_FOREACH(pe, have_refs, entry)
865 		sendreq.nrefs++;
866 	TAILQ_FOREACH(pe, delete_refs, entry)
867 		sendreq.nrefs++;
868 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
869 	    &sendreq, sizeof(sendreq)) == -1) {
870 		err = got_error_from_errno(
871 		    "imsg_compose FETCH_SERVER_PROGRESS");
872 		goto done;
873 	}
874 
875 	err = flush_imsg(ibuf);
876 	if (err)
877 		goto done;
878 	fd = -1;
879 
880 	TAILQ_FOREACH(pe, have_refs, entry) {
881 		const char *name = pe->path;
882 		size_t name_len = pe->path_len;
883 		struct got_object_id *id = pe->data;
884 		err = send_send_ref(name, name_len, id, 0, ibuf);
885 		if (err)
886 			goto done;
887 	}
888 
889 	TAILQ_FOREACH(pe, delete_refs, entry) {
890 		const char *name = pe->path;
891 		size_t name_len = pe->path_len;
892 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
893 		if (err)
894 			goto done;
895 	}
896 done:
897 	if (fd != -1 && close(fd) == -1 && err == NULL)
898 		err = got_error_from_errno("close");
899 	return err;
900 
901 }
902 
903 const struct got_error *
904 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
905     struct imsgbuf *ibuf)
906 {
907 	const struct got_error *err = NULL;
908 	struct imsg imsg;
909 	size_t datalen;
910 	int done = 0;
911 	struct got_imsg_send_remote_ref iremote_ref;
912 	struct got_object_id *id = NULL;
913 	char *refname = NULL;
914 	struct got_pathlist_entry *new;
915 
916 	while (!done) {
917 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
918 		if (err)
919 			return err;
920 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
921 		switch (imsg.hdr.type) {
922 		case GOT_IMSG_SEND_REMOTE_REF:
923 			if (datalen < sizeof(iremote_ref)) {
924 				err = got_error(GOT_ERR_PRIVSEP_MSG);
925 				goto done;
926 			}
927 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
928 			if (datalen != sizeof(iremote_ref) +
929 			    iremote_ref.name_len) {
930 				err = got_error(GOT_ERR_PRIVSEP_MSG);
931 				goto done;
932 			}
933 			id = malloc(sizeof(*id));
934 			if (id == NULL) {
935 				err = got_error_from_errno("malloc");
936 				goto done;
937 			}
938 			memcpy(id, &iremote_ref.id, sizeof(*id));
939 			refname = strndup(imsg.data + sizeof(iremote_ref),
940 			    datalen - sizeof(iremote_ref));
941 			if (refname == NULL) {
942 				err = got_error_from_errno("strndup");
943 				goto done;
944 			}
945 			err = got_pathlist_insert(&new, remote_refs,
946 			    refname, id);
947 			if (err)
948 				goto done;
949 			if (new == NULL) { /* duplicate which wasn't inserted */
950 				free(id);
951 				free(refname);
952 			}
953 			id = NULL;
954 			refname = NULL;
955 			break;
956 		case GOT_IMSG_SEND_PACK_REQUEST:
957 			if (datalen != 0) {
958 				err = got_error(GOT_ERR_PRIVSEP_MSG);
959 				goto done;
960 			}
961 			/* got-send-pack is now waiting for a pack file. */
962 			done = 1;
963 			break;
964 		default:
965 			err = got_error(GOT_ERR_PRIVSEP_MSG);
966 			break;
967 		}
968 	}
969 done:
970 	free(id);
971 	free(refname);
972 	imsg_free(&imsg);
973 	return err;
974 }
975 
976 const struct got_error *
977 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
978 {
979 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
980 }
981 
982 const struct got_error *
983 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
984     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
985 {
986 	const struct got_error *err = NULL;
987 	struct imsg imsg;
988 	size_t datalen;
989 	struct got_imsg_send_ref_status iref_status;
990 
991 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
992 	*done = 0;
993 	*success = 0;
994 	*refname = NULL;
995 	*errmsg = NULL;
996 
997 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
998 	if (err)
999 		return err;
1000 
1001 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1002 	switch (imsg.hdr.type) {
1003 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1004 		if (datalen < sizeof(*bytes_sent)) {
1005 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1006 			break;
1007 		}
1008 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1009 		break;
1010 	case GOT_IMSG_SEND_REF_STATUS:
1011 		if (datalen < sizeof(iref_status)) {
1012 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1013 			break;
1014 		}
1015 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1016 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1017 		    iref_status.errmsg_len) {
1018 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1019 			break;
1020 		}
1021 		*success = iref_status.success;
1022 		*refname = strndup(imsg.data + sizeof(iref_status),
1023 		    iref_status.name_len);
1024 
1025 		if (iref_status.errmsg_len != 0)
1026 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1027 			    iref_status.name_len, iref_status.errmsg_len);
1028 		break;
1029 	case GOT_IMSG_SEND_DONE:
1030 		if (datalen != 0) {
1031 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1032 			break;
1033 		}
1034 		*done = 1;
1035 		break;
1036 	default:
1037 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1038 		break;
1039 	}
1040 
1041 	imsg_free(&imsg);
1042 	return err;
1043 }
1044 
1045 const struct got_error *
1046 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1047     int fd)
1048 {
1049 	const struct got_error *err = NULL;
1050 
1051 	/* Keep in sync with struct got_imsg_index_pack_request */
1052 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1053 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1054 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1055 		close(fd);
1056 		return err;
1057 	}
1058 	return flush_imsg(ibuf);
1059 }
1060 
1061 const struct got_error *
1062 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1063 {
1064 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1065 }
1066 
1067 const struct got_error *
1068 got_privsep_recv_index_progress(int *done, int *nobj_total,
1069     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1070     struct imsgbuf *ibuf)
1071 {
1072 	const struct got_error *err = NULL;
1073 	struct imsg imsg;
1074 	struct got_imsg_index_pack_progress *iprogress;
1075 	size_t datalen;
1076 
1077 	*done = 0;
1078 	*nobj_total = 0;
1079 	*nobj_indexed = 0;
1080 	*nobj_resolved = 0;
1081 
1082 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1083 	if (err)
1084 		return err;
1085 
1086 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1087 	switch (imsg.hdr.type) {
1088 	case GOT_IMSG_IDXPACK_PROGRESS:
1089 		if (datalen < sizeof(*iprogress)) {
1090 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1091 			break;
1092 		}
1093 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1094 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1095 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1096 			err = got_error(GOT_ERR_RANGE);
1097 			break;
1098 		}
1099 		*nobj_total = iprogress->nobj_total;
1100 		*nobj_indexed = iprogress->nobj_indexed;
1101 		*nobj_loose = iprogress->nobj_loose;
1102 		*nobj_resolved = iprogress->nobj_resolved;
1103 		break;
1104 	case GOT_IMSG_IDXPACK_DONE:
1105 		if (datalen != 0) {
1106 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1107 			break;
1108 		}
1109 		*done = 1;
1110 		break;
1111 	default:
1112 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1113 		break;
1114 	}
1115 
1116 	imsg_free(&imsg);
1117 	return err;
1118 }
1119 
1120 const struct got_error *
1121 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1122     struct imsgbuf *ibuf)
1123 {
1124 	struct got_imsg_object *iobj;
1125 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1126 
1127 	if (datalen != sizeof(*iobj))
1128 		return got_error(GOT_ERR_PRIVSEP_LEN);
1129 	iobj = imsg->data;
1130 
1131 	if (iobj->pack_offset < 0)
1132 		return got_error(GOT_ERR_PACK_OFFSET);
1133 
1134 	*obj = calloc(1, sizeof(**obj));
1135 	if (*obj == NULL)
1136 		return got_error_from_errno("calloc");
1137 
1138 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1139 	(*obj)->type = iobj->type;
1140 	(*obj)->flags = iobj->flags;
1141 	(*obj)->hdrlen = iobj->hdrlen;
1142 	(*obj)->size = iobj->size;
1143 	/* path_packfile is handled by caller */
1144 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1145 		(*obj)->pack_offset = iobj->pack_offset;
1146 		(*obj)->pack_idx = iobj->pack_idx;
1147 	}
1148 	STAILQ_INIT(&(*obj)->deltas.entries);
1149 	return NULL;
1150 }
1151 
1152 const struct got_error *
1153 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1154 {
1155 	const struct got_error *err = NULL;
1156 	struct imsg imsg;
1157 	const size_t min_datalen =
1158 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1159 
1160 	*obj = NULL;
1161 
1162 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1163 	if (err)
1164 		return err;
1165 
1166 	switch (imsg.hdr.type) {
1167 	case GOT_IMSG_OBJECT:
1168 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1169 		break;
1170 	default:
1171 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1172 		break;
1173 	}
1174 
1175 	imsg_free(&imsg);
1176 
1177 	return err;
1178 }
1179 
1180 static const struct got_error *
1181 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1182     size_t logmsg_len)
1183 {
1184 	const struct got_error *err = NULL;
1185 	size_t offset, remain;
1186 
1187 	offset = 0;
1188 	remain = logmsg_len;
1189 	while (remain > 0) {
1190 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1191 
1192 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1193 		    commit->logmsg + offset, n) == -1) {
1194 			err = got_error_from_errno("imsg_compose "
1195 			    "COMMIT_LOGMSG");
1196 			break;
1197 		}
1198 
1199 		err = flush_imsg(ibuf);
1200 		if (err)
1201 			break;
1202 
1203 		offset += n;
1204 		remain -= n;
1205 	}
1206 
1207 	return err;
1208 }
1209 
1210 const struct got_error *
1211 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1212 {
1213 	const struct got_error *err = NULL;
1214 	struct got_imsg_commit_object *icommit;
1215 	uint8_t *buf;
1216 	size_t len, total;
1217 	struct got_object_qid *qid;
1218 	size_t author_len = strlen(commit->author);
1219 	size_t committer_len = strlen(commit->committer);
1220 	size_t logmsg_len = strlen(commit->logmsg);
1221 
1222 	total = sizeof(*icommit) + author_len + committer_len +
1223 	    commit->nparents * sizeof(struct got_object_id);
1224 
1225 	buf = malloc(total);
1226 	if (buf == NULL)
1227 		return got_error_from_errno("malloc");
1228 
1229 	icommit = (struct got_imsg_commit_object *)buf;
1230 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1231 	icommit->author_len = author_len;
1232 	icommit->author_time = commit->author_time;
1233 	icommit->author_gmtoff = commit->author_gmtoff;
1234 	icommit->committer_len = committer_len;
1235 	icommit->committer_time = commit->committer_time;
1236 	icommit->committer_gmtoff = commit->committer_gmtoff;
1237 	icommit->logmsg_len = logmsg_len;
1238 	icommit->nparents = commit->nparents;
1239 
1240 	len = sizeof(*icommit);
1241 	memcpy(buf + len, commit->author, author_len);
1242 	len += author_len;
1243 	memcpy(buf + len, commit->committer, committer_len);
1244 	len += committer_len;
1245 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1246 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1247 		len += sizeof(qid->id);
1248 	}
1249 
1250 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1251 		err = got_error_from_errno("imsg_compose COMMIT");
1252 		goto done;
1253 	}
1254 
1255 	if (logmsg_len == 0 ||
1256 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1257 		err = flush_imsg(ibuf);
1258 		if (err)
1259 			goto done;
1260 	}
1261 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1262 done:
1263 	free(buf);
1264 	return err;
1265 }
1266 
1267 static const struct got_error *
1268 get_commit_from_imsg(struct got_commit_object **commit,
1269     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1270 {
1271 	const struct got_error *err = NULL;
1272 	struct got_imsg_commit_object *icommit;
1273 	size_t len = 0;
1274 	int i;
1275 
1276 	if (datalen < sizeof(*icommit))
1277 		return got_error(GOT_ERR_PRIVSEP_LEN);
1278 
1279 	icommit = imsg->data;
1280 	if (datalen != sizeof(*icommit) + icommit->author_len +
1281 	    icommit->committer_len +
1282 	    icommit->nparents * sizeof(struct got_object_id))
1283 		return got_error(GOT_ERR_PRIVSEP_LEN);
1284 
1285 	if (icommit->nparents < 0)
1286 		return got_error(GOT_ERR_PRIVSEP_LEN);
1287 
1288 	len += sizeof(*icommit);
1289 
1290 	*commit = got_object_commit_alloc_partial();
1291 	if (*commit == NULL)
1292 		return got_error_from_errno(
1293 		    "got_object_commit_alloc_partial");
1294 
1295 	memcpy((*commit)->tree_id, &icommit->tree_id,
1296 	    sizeof(icommit->tree_id));
1297 	(*commit)->author_time = icommit->author_time;
1298 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1299 	(*commit)->committer_time = icommit->committer_time;
1300 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1301 
1302 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1303 	if ((*commit)->author == NULL) {
1304 		err = got_error_from_errno("strndup");
1305 		goto done;
1306 	}
1307 	len += icommit->author_len;
1308 
1309 	(*commit)->committer = strndup(imsg->data + len,
1310 	    icommit->committer_len);
1311 	if ((*commit)->committer == NULL) {
1312 		err = got_error_from_errno("strndup");
1313 		goto done;
1314 	}
1315 	len += icommit->committer_len;
1316 
1317 	if (icommit->logmsg_len == 0) {
1318 		(*commit)->logmsg = strdup("");
1319 		if ((*commit)->logmsg == NULL) {
1320 			err = got_error_from_errno("strdup");
1321 			goto done;
1322 		}
1323 	} else {
1324 		size_t offset = 0, remain = icommit->logmsg_len;
1325 
1326 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1327 		if ((*commit)->logmsg == NULL) {
1328 			err = got_error_from_errno("malloc");
1329 			goto done;
1330 		}
1331 		while (remain > 0) {
1332 			struct imsg imsg_log;
1333 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1334 			    remain);
1335 
1336 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1337 			if (err)
1338 				goto done;
1339 
1340 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1341 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1342 				goto done;
1343 			}
1344 
1345 			memcpy((*commit)->logmsg + offset,
1346 			    imsg_log.data, n);
1347 			imsg_free(&imsg_log);
1348 			offset += n;
1349 			remain -= n;
1350 		}
1351 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1352 	}
1353 
1354 	for (i = 0; i < icommit->nparents; i++) {
1355 		struct got_object_qid *qid;
1356 
1357 		err = got_object_qid_alloc_partial(&qid);
1358 		if (err)
1359 			break;
1360 		memcpy(&qid->id, imsg->data + len +
1361 		    i * sizeof(qid->id), sizeof(qid->id));
1362 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1363 		(*commit)->nparents++;
1364 	}
1365 done:
1366 	if (err) {
1367 		got_object_commit_close(*commit);
1368 		*commit = NULL;
1369 	}
1370 	return err;
1371 }
1372 
1373 const struct got_error *
1374 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1375 {
1376 	const struct got_error *err = NULL;
1377 	struct imsg imsg;
1378 	size_t datalen;
1379 	const size_t min_datalen =
1380 	    MIN(sizeof(struct got_imsg_error),
1381 	    sizeof(struct got_imsg_commit_object));
1382 
1383 	*commit = NULL;
1384 
1385 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1386 	if (err)
1387 		return err;
1388 
1389 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1390 
1391 	switch (imsg.hdr.type) {
1392 	case GOT_IMSG_COMMIT:
1393 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1394 		break;
1395 	default:
1396 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1397 		break;
1398 	}
1399 
1400 	imsg_free(&imsg);
1401 
1402 	return err;
1403 }
1404 
1405 static const struct got_error *
1406 send_tree_entries_batch(struct imsgbuf *ibuf,
1407     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1408 {
1409 	struct ibuf *wbuf;
1410 	struct got_imsg_tree_entries ientries;
1411 	int i;
1412 
1413 	memset(&ientries, 0, sizeof(ientries));
1414 
1415 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1416 	if (wbuf == NULL)
1417 		return got_error_from_errno("imsg_create TREE_ENTRY");
1418 
1419 	ientries.nentries = idxN - idx0 + 1;
1420 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1421 		return got_error_from_errno("imsg_add TREE_ENTRY");
1422 
1423 	for (i = idx0; i <= idxN; i++) {
1424 		struct got_parsed_tree_entry *pte = &entries[i];
1425 
1426 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1427 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1428 			return got_error_from_errno("imsg_add TREE_ENTRY");
1429 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1430 			return got_error_from_errno("imsg_add TREE_ENTRY");
1431 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1432 			return got_error_from_errno("imsg_add TREE_ENTRY");
1433 
1434 		/* Remaining bytes are the entry's name. */
1435 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1436 			return got_error_from_errno("imsg_add TREE_ENTRY");
1437 	}
1438 
1439 	wbuf->fd = -1;
1440 	imsg_close(ibuf, wbuf);
1441 	return NULL;
1442 }
1443 
1444 static const struct got_error *
1445 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1446     int nentries)
1447 {
1448 	const struct got_error *err = NULL;
1449 	int i, j;
1450 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1451 
1452 	i = 0;
1453 	for (j = 0; j < nentries; j++) {
1454 		struct got_parsed_tree_entry *pte = &entries[j];
1455 		size_t len = sizeof(struct got_imsg_tree_entry) + pte->namelen;
1456 
1457 		if (j > 0 &&
1458 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1459 			err = send_tree_entries_batch(ibuf, entries,
1460 			    i, j - 1, entries_len);
1461 			if (err)
1462 				return err;
1463 			i = j;
1464 			entries_len = sizeof(struct got_imsg_tree_entries);
1465 		}
1466 
1467 		entries_len += len;
1468 	}
1469 
1470 	if (j > 0) {
1471 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1472 		    entries_len);
1473 		if (err)
1474 			return err;
1475 	}
1476 
1477 	return NULL;
1478 }
1479 
1480 const struct got_error *
1481 got_privsep_send_tree(struct imsgbuf *ibuf,
1482     struct got_parsed_tree_entry *entries, int nentries)
1483 {
1484 	const struct got_error *err = NULL;
1485 	struct got_imsg_tree_object itree;
1486 
1487 	memset(&itree, 0, sizeof(itree));
1488 	itree.nentries = nentries;
1489 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1490 	    == -1)
1491 		return got_error_from_errno("imsg_compose TREE");
1492 
1493 	err = send_tree_entries(ibuf, entries, nentries);
1494 	if (err)
1495 		return err;
1496 
1497 	return flush_imsg(ibuf);
1498 }
1499 
1500 
1501 static const struct got_error *
1502 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1503     int *nentries)
1504 {
1505 	const struct got_error *err = NULL;
1506 	struct got_imsg_tree_entries *ientries;
1507 	struct got_tree_entry *te;
1508 	size_t te_offset;
1509 	size_t i;
1510 
1511 	if (datalen <= sizeof(*ientries) ||
1512 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1513 		return got_error(GOT_ERR_PRIVSEP_LEN);
1514 
1515 	ientries = (struct got_imsg_tree_entries *)data;
1516 	if (ientries->nentries > INT_MAX) {
1517 		return got_error_msg(GOT_ERR_NO_SPACE,
1518 		    "too many tree entries");
1519 	}
1520 
1521 	te_offset = sizeof(*ientries);
1522 	for (i = 0; i < ientries->nentries; i++) {
1523 		struct got_imsg_tree_entry ite;
1524 		const char *te_name;
1525 		uint8_t *buf = (uint8_t *)data + te_offset;
1526 
1527 		if (te_offset >= datalen) {
1528 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1529 			break;
1530 		}
1531 
1532 		/* Might not be aligned, size is ~32 bytes. */
1533 		memcpy(&ite, buf, sizeof(ite));
1534 
1535 		if (ite.namelen >= sizeof(te->name)) {
1536 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1537 			break;
1538 		}
1539 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1540 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1541 			break;
1542 		}
1543 
1544 		if (*nentries >= tree->nentries) {
1545 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1546 			break;
1547 		}
1548 		te = &tree->entries[*nentries];
1549 		te_name = buf + sizeof(ite);
1550 		memcpy(te->name, te_name, ite.namelen);
1551 		te->name[ite.namelen] = '\0';
1552 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1553 		te->mode = ite.mode;
1554 		te->idx = *nentries;
1555 		(*nentries)++;
1556 
1557 		te_offset += sizeof(ite) + ite.namelen;
1558 	}
1559 
1560 	return err;
1561 }
1562 
1563 const struct got_error *
1564 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1565 {
1566 	const struct got_error *err = NULL;
1567 	const size_t min_datalen =
1568 	    MIN(sizeof(struct got_imsg_error),
1569 	    sizeof(struct got_imsg_tree_object));
1570 	struct got_imsg_tree_object *itree;
1571 	int nentries = 0;
1572 
1573 	*tree = NULL;
1574 
1575 	while (*tree == NULL || nentries < (*tree)->nentries) {
1576 		struct imsg imsg;
1577 		size_t datalen;
1578 
1579 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1580 		if (err)
1581 			break;
1582 
1583 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1584 
1585 		switch (imsg.hdr.type) {
1586 		case GOT_IMSG_TREE:
1587 			/* This message should only appear once. */
1588 			if (*tree != NULL) {
1589 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1590 				break;
1591 			}
1592 			if (datalen != sizeof(*itree)) {
1593 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1594 				break;
1595 			}
1596 			itree = imsg.data;
1597 			if (itree->nentries < 0) {
1598 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1599 				break;
1600 			}
1601 			*tree = malloc(sizeof(**tree));
1602 			if (*tree == NULL) {
1603 				err = got_error_from_errno("malloc");
1604 				break;
1605 			}
1606 			(*tree)->entries = calloc(itree->nentries,
1607 			    sizeof(struct got_tree_entry));
1608 			if ((*tree)->entries == NULL) {
1609 				err = got_error_from_errno("malloc");
1610 				free(*tree);
1611 				*tree = NULL;
1612 				break;
1613 			}
1614 			(*tree)->nentries = itree->nentries;
1615 			(*tree)->refcnt = 0;
1616 			break;
1617 		case GOT_IMSG_TREE_ENTRIES:
1618 			/* This message should be preceeded by GOT_IMSG_TREE. */
1619 			if (*tree == NULL) {
1620 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1621 				break;
1622 			}
1623 			err = recv_tree_entries(imsg.data, datalen,
1624 			    *tree, &nentries);
1625 			break;
1626 		default:
1627 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1628 			break;
1629 		}
1630 
1631 		imsg_free(&imsg);
1632 		if (err)
1633 			break;
1634 	}
1635 
1636 	if (*tree && (*tree)->nentries != nentries) {
1637 		if (err == NULL)
1638 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1639 		got_object_tree_close(*tree);
1640 		*tree = NULL;
1641 	}
1642 
1643 	return err;
1644 }
1645 
1646 const struct got_error *
1647 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1648     const uint8_t *data)
1649 {
1650 	struct got_imsg_blob iblob;
1651 
1652 	memset(&iblob, 0, sizeof(iblob));
1653 	iblob.size = size;
1654 	iblob.hdrlen = hdrlen;
1655 
1656 	if (data) {
1657 		uint8_t *buf;
1658 
1659 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1660 			return got_error(GOT_ERR_NO_SPACE);
1661 
1662 		buf = malloc(sizeof(iblob) + size);
1663 		if (buf == NULL)
1664 			return got_error_from_errno("malloc");
1665 
1666 		memcpy(buf, &iblob, sizeof(iblob));
1667 		memcpy(buf + sizeof(iblob), data, size);
1668 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1669 		    sizeof(iblob) + size) == -1) {
1670 			free(buf);
1671 			return got_error_from_errno("imsg_compose BLOB");
1672 		}
1673 		free(buf);
1674 	} else {
1675 		/* Data has already been written to file descriptor. */
1676 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1677 		    sizeof(iblob)) == -1)
1678 			return got_error_from_errno("imsg_compose BLOB");
1679 	}
1680 
1681 
1682 	return flush_imsg(ibuf);
1683 }
1684 
1685 const struct got_error *
1686 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1687     struct imsgbuf *ibuf)
1688 {
1689 	const struct got_error *err = NULL;
1690 	struct imsg imsg;
1691 	struct got_imsg_blob *iblob;
1692 	size_t datalen;
1693 
1694 	*outbuf = NULL;
1695 
1696 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1697 	if (err)
1698 		return err;
1699 
1700 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1701 
1702 	switch (imsg.hdr.type) {
1703 	case GOT_IMSG_BLOB:
1704 		if (datalen < sizeof(*iblob)) {
1705 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1706 			break;
1707 		}
1708 		iblob = imsg.data;
1709 		*size = iblob->size;
1710 		*hdrlen = iblob->hdrlen;
1711 
1712 		if (datalen == sizeof(*iblob)) {
1713 			/* Data has been written to file descriptor. */
1714 			break;
1715 		}
1716 
1717 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1718 		    *size > datalen + sizeof(*iblob)) {
1719 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1720 			break;
1721 		}
1722 
1723 		*outbuf = malloc(*size);
1724 		if (*outbuf == NULL) {
1725 			err = got_error_from_errno("malloc");
1726 			break;
1727 		}
1728 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1729 		break;
1730 	default:
1731 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1732 		break;
1733 	}
1734 
1735 	imsg_free(&imsg);
1736 
1737 	return err;
1738 }
1739 
1740 static const struct got_error *
1741 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1742 {
1743 	const struct got_error *err = NULL;
1744 	size_t offset, remain;
1745 
1746 	offset = 0;
1747 	remain = tagmsg_len;
1748 	while (remain > 0) {
1749 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1750 
1751 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1752 		    tag->tagmsg + offset, n) == -1) {
1753 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1754 			break;
1755 		}
1756 
1757 		err = flush_imsg(ibuf);
1758 		if (err)
1759 			break;
1760 
1761 		offset += n;
1762 		remain -= n;
1763 	}
1764 
1765 	return err;
1766 }
1767 
1768 const struct got_error *
1769 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1770 {
1771 	const struct got_error *err = NULL;
1772 	struct got_imsg_tag_object *itag;
1773 	uint8_t *buf;
1774 	size_t len, total;
1775 	size_t tag_len = strlen(tag->tag);
1776 	size_t tagger_len = strlen(tag->tagger);
1777 	size_t tagmsg_len = strlen(tag->tagmsg);
1778 
1779 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1780 
1781 	buf = malloc(total);
1782 	if (buf == NULL)
1783 		return got_error_from_errno("malloc");
1784 
1785 	itag = (struct got_imsg_tag_object *)buf;
1786 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1787 	itag->obj_type = tag->obj_type;
1788 	itag->tag_len = tag_len;
1789 	itag->tagger_len = tagger_len;
1790 	itag->tagger_time = tag->tagger_time;
1791 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1792 	itag->tagmsg_len = tagmsg_len;
1793 
1794 	len = sizeof(*itag);
1795 	memcpy(buf + len, tag->tag, tag_len);
1796 	len += tag_len;
1797 	memcpy(buf + len, tag->tagger, tagger_len);
1798 	len += tagger_len;
1799 
1800 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1801 		err = got_error_from_errno("imsg_compose TAG");
1802 		goto done;
1803 	}
1804 
1805 	if (tagmsg_len == 0 ||
1806 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1807 		err = flush_imsg(ibuf);
1808 		if (err)
1809 			goto done;
1810 	}
1811 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1812 done:
1813 	free(buf);
1814 	return err;
1815 }
1816 
1817 const struct got_error *
1818 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1819 {
1820 	const struct got_error *err = NULL;
1821 	struct imsg imsg;
1822 	struct got_imsg_tag_object *itag;
1823 	size_t len, datalen;
1824 	const size_t min_datalen =
1825 	    MIN(sizeof(struct got_imsg_error),
1826 	    sizeof(struct got_imsg_tag_object));
1827 
1828 	*tag = NULL;
1829 
1830 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1831 	if (err)
1832 		return err;
1833 
1834 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1835 	len = 0;
1836 
1837 	switch (imsg.hdr.type) {
1838 	case GOT_IMSG_TAG:
1839 		if (datalen < sizeof(*itag)) {
1840 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1841 			break;
1842 		}
1843 		itag = imsg.data;
1844 		if (datalen != sizeof(*itag) + itag->tag_len +
1845 		    itag->tagger_len) {
1846 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1847 			break;
1848 		}
1849 		len += sizeof(*itag);
1850 
1851 		*tag = calloc(1, sizeof(**tag));
1852 		if (*tag == NULL) {
1853 			err = got_error_from_errno("calloc");
1854 			break;
1855 		}
1856 
1857 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1858 
1859 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1860 		if ((*tag)->tag == NULL) {
1861 			err = got_error_from_errno("strndup");
1862 			break;
1863 		}
1864 		len += itag->tag_len;
1865 
1866 		(*tag)->obj_type = itag->obj_type;
1867 		(*tag)->tagger_time = itag->tagger_time;
1868 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1869 
1870 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1871 		if ((*tag)->tagger == NULL) {
1872 			err = got_error_from_errno("strndup");
1873 			break;
1874 		}
1875 		len += itag->tagger_len;
1876 
1877 		if (itag->tagmsg_len == 0) {
1878 			(*tag)->tagmsg = strdup("");
1879 			if ((*tag)->tagmsg == NULL) {
1880 				err = got_error_from_errno("strdup");
1881 				break;
1882 			}
1883 		} else {
1884 			size_t offset = 0, remain = itag->tagmsg_len;
1885 
1886 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1887 			if ((*tag)->tagmsg == NULL) {
1888 				err = got_error_from_errno("malloc");
1889 				break;
1890 			}
1891 			while (remain > 0) {
1892 				struct imsg imsg_log;
1893 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1894 				    remain);
1895 
1896 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1897 				if (err)
1898 					return err;
1899 
1900 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1901 					return got_error(GOT_ERR_PRIVSEP_MSG);
1902 
1903 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1904 				    n);
1905 				imsg_free(&imsg_log);
1906 				offset += n;
1907 				remain -= n;
1908 			}
1909 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1910 		}
1911 
1912 		break;
1913 	default:
1914 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1915 		break;
1916 	}
1917 
1918 	imsg_free(&imsg);
1919 
1920 	return err;
1921 }
1922 
1923 const struct got_error *
1924 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1925     struct got_packidx *packidx)
1926 {
1927 	const struct got_error *err = NULL;
1928 	struct got_imsg_packidx ipackidx;
1929 	struct got_imsg_pack ipack;
1930 	int fd;
1931 
1932 	memset(&ipackidx, 0, sizeof(ipackidx));
1933 	memset(&ipack, 0, sizeof(ipack));
1934 
1935 	ipackidx.len = packidx->len;
1936 	ipackidx.packfile_size = pack->filesize;
1937 	fd = dup(packidx->fd);
1938 	if (fd == -1)
1939 		return got_error_from_errno("dup");
1940 
1941 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1942 	    sizeof(ipackidx)) == -1) {
1943 		err = got_error_from_errno("imsg_compose PACKIDX");
1944 		close(fd);
1945 		return err;
1946 	}
1947 
1948 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1949 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1950 		return got_error(GOT_ERR_NO_SPACE);
1951 	ipack.filesize = pack->filesize;
1952 
1953 	fd = dup(pack->fd);
1954 	if (fd == -1)
1955 		return got_error_from_errno("dup");
1956 
1957 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1958 	    == -1) {
1959 		err = got_error_from_errno("imsg_compose PACK");
1960 		close(fd);
1961 		return err;
1962 	}
1963 
1964 	return flush_imsg(ibuf);
1965 }
1966 
1967 const struct got_error *
1968 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1969     struct got_object_id *id)
1970 {
1971 	struct got_imsg_packed_object iobj;
1972 
1973 	memset(&iobj, 0, sizeof(iobj));
1974 	iobj.idx = idx;
1975 	memcpy(&iobj.id, id, sizeof(iobj.id));
1976 
1977 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1978 	    &iobj, sizeof(iobj)) == -1)
1979 		return got_error_from_errno("imsg_compose "
1980 		    "PACKED_OBJECT_REQUEST");
1981 
1982 	return flush_imsg(ibuf);
1983 }
1984 
1985 const struct got_error *
1986 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1987     struct got_object_id *id)
1988 {
1989 	struct got_imsg_packed_object iobj;
1990 
1991 	memset(&iobj, 0, sizeof(iobj));
1992 	iobj.idx = idx;
1993 	memcpy(&iobj.id, id, sizeof(iobj.id));
1994 
1995 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
1996 	    &iobj, sizeof(iobj)) == -1)
1997 		return got_error_from_errno("imsg_compose "
1998 		    "PACKED_OBJECT_REQUEST");
1999 
2000 	return flush_imsg(ibuf);
2001 }
2002 
2003 const struct got_error *
2004 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2005 {
2006 	const struct got_error *err = NULL;
2007 
2008 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2009 	    NULL, 0) == -1) {
2010 		err = got_error_from_errno("imsg_compose "
2011 		    "GITCONFIG_PARSE_REQUEST");
2012 		close(fd);
2013 		return err;
2014 	}
2015 
2016 	return flush_imsg(ibuf);
2017 }
2018 
2019 const struct got_error *
2020 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2021 {
2022 	if (imsg_compose(ibuf,
2023 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2024 	    NULL, 0) == -1)
2025 		return got_error_from_errno("imsg_compose "
2026 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2027 
2028 	return flush_imsg(ibuf);
2029 }
2030 
2031 const struct got_error *
2032 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2033 {
2034 	if (imsg_compose(ibuf,
2035 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2036 	    NULL, 0) == -1)
2037 		return got_error_from_errno("imsg_compose "
2038 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2039 
2040 	return flush_imsg(ibuf);
2041 }
2042 
2043 
2044 const struct got_error *
2045 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2046 {
2047 	if (imsg_compose(ibuf,
2048 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2049 		return got_error_from_errno("imsg_compose "
2050 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2051 
2052 	return flush_imsg(ibuf);
2053 }
2054 
2055 const struct got_error *
2056 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2057 {
2058 	if (imsg_compose(ibuf,
2059 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2060 		return got_error_from_errno("imsg_compose "
2061 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2062 
2063 	return flush_imsg(ibuf);
2064 }
2065 
2066 const struct got_error *
2067 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2068 {
2069 	if (imsg_compose(ibuf,
2070 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2071 		return got_error_from_errno("imsg_compose "
2072 		    "GITCONFIG_REMOTE_REQUEST");
2073 
2074 	return flush_imsg(ibuf);
2075 }
2076 
2077 const struct got_error *
2078 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2079 {
2080 	if (imsg_compose(ibuf,
2081 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2082 		return got_error_from_errno("imsg_compose "
2083 		    "GITCONFIG_OWNER_REQUEST");
2084 
2085 	return flush_imsg(ibuf);
2086 }
2087 
2088 const struct got_error *
2089 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2090 {
2091 	const struct got_error *err = NULL;
2092 	struct imsg imsg;
2093 	size_t datalen;
2094 
2095 	*str = NULL;
2096 
2097 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2098 	if (err)
2099 		return err;
2100 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2101 
2102 	switch (imsg.hdr.type) {
2103 	case GOT_IMSG_GITCONFIG_STR_VAL:
2104 		if (datalen == 0)
2105 			break;
2106 		*str = strndup(imsg.data, datalen);
2107 		if (*str == NULL) {
2108 			err = got_error_from_errno("strndup");
2109 			break;
2110 		}
2111 		break;
2112 	default:
2113 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2114 		break;
2115 	}
2116 
2117 	imsg_free(&imsg);
2118 	return err;
2119 }
2120 
2121 const struct got_error *
2122 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2123 {
2124 	const struct got_error *err = NULL;
2125 	struct got_imsg_gitconfig_pair p;
2126 	struct imsg imsg;
2127 	size_t datalen;
2128 	uint8_t *data;
2129 
2130 	*key = *val = NULL;
2131 
2132 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2133 	if (err)
2134 		return err;
2135 
2136 	data = imsg.data;
2137 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2138 
2139 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2140 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2141 		goto done;
2142 	}
2143 
2144 	if (datalen < sizeof(p)) {
2145 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2146 		goto done;
2147 	}
2148 
2149 	memcpy(&p, data, sizeof(p));
2150 	data += sizeof(p);
2151 
2152 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2153 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2154 		goto done;
2155 	}
2156 
2157 	*key = strndup(data, p.klen);
2158 	if (*key == NULL) {
2159 		err = got_error_from_errno("strndup");
2160 		goto done;
2161 	}
2162 	data += p.klen;
2163 
2164 	*val = strndup(data, p.vlen);
2165 	if (*val == NULL) {
2166 		err = got_error_from_errno("strndup");
2167 		goto done;
2168 	}
2169 
2170 done:
2171 	imsg_free(&imsg);
2172 	return err;
2173 }
2174 
2175 const struct got_error *
2176 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2177 {
2178 	const struct got_error *err = NULL;
2179 	struct imsg imsg;
2180 	size_t datalen;
2181 	const size_t min_datalen =
2182 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2183 
2184 	*val = 0;
2185 
2186 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2187 	if (err)
2188 		return err;
2189 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2190 
2191 	switch (imsg.hdr.type) {
2192 	case GOT_IMSG_GITCONFIG_INT_VAL:
2193 		if (datalen != sizeof(*val)) {
2194 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2195 			break;
2196 		}
2197 		memcpy(val, imsg.data, sizeof(*val));
2198 		break;
2199 	default:
2200 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2201 		break;
2202 	}
2203 
2204 	imsg_free(&imsg);
2205 	return err;
2206 }
2207 
2208 static void
2209 free_remote_data(struct got_remote_repo *remote)
2210 {
2211 	int i;
2212 
2213 	free(remote->name);
2214 	free(remote->fetch_url);
2215 	free(remote->send_url);
2216 	for (i = 0; i < remote->nfetch_branches; i++)
2217 		free(remote->fetch_branches[i]);
2218 	free(remote->fetch_branches);
2219 	for (i = 0; i < remote->nsend_branches; i++)
2220 		free(remote->send_branches[i]);
2221 	free(remote->send_branches);
2222 	for (i = 0; i < remote->nfetch_refs; i++)
2223 		free(remote->fetch_refs[i]);
2224 	free(remote->fetch_refs);
2225 }
2226 
2227 const struct got_error *
2228 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2229     int *nremotes, struct imsgbuf *ibuf)
2230 {
2231 	const struct got_error *err = NULL;
2232 	struct imsg imsg;
2233 	size_t datalen;
2234 	struct got_imsg_remotes iremotes;
2235 	struct got_imsg_remote iremote;
2236 
2237 	*remotes = NULL;
2238 	*nremotes = 0;
2239 	iremotes.nremotes = 0;
2240 
2241 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2242 	if (err)
2243 		return err;
2244 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2245 
2246 	switch (imsg.hdr.type) {
2247 	case GOT_IMSG_GITCONFIG_REMOTES:
2248 		if (datalen != sizeof(iremotes)) {
2249 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2250 			break;
2251 		}
2252 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2253 		if (iremotes.nremotes == 0) {
2254 			imsg_free(&imsg);
2255 			return NULL;
2256 		}
2257 		break;
2258 	default:
2259 		imsg_free(&imsg);
2260 		return got_error(GOT_ERR_PRIVSEP_MSG);
2261 	}
2262 
2263 	imsg_free(&imsg);
2264 
2265 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2266 	if (*remotes == NULL)
2267 		return got_error_from_errno("recallocarray");
2268 
2269 	while (*nremotes < iremotes.nremotes) {
2270 		struct got_remote_repo *remote;
2271 
2272 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2273 		if (err)
2274 			break;
2275 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2276 
2277 		switch (imsg.hdr.type) {
2278 		case GOT_IMSG_GITCONFIG_REMOTE:
2279 			remote = &(*remotes)[*nremotes];
2280 			memset(remote, 0, sizeof(*remote));
2281 			if (datalen < sizeof(iremote)) {
2282 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2283 				break;
2284 			}
2285 			memcpy(&iremote, imsg.data, sizeof(iremote));
2286 			if (iremote.name_len == 0 ||
2287 			    iremote.fetch_url_len == 0 ||
2288 			    iremote.send_url_len == 0 ||
2289 			    (sizeof(iremote) + iremote.name_len +
2290 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2291 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2292 				break;
2293 			}
2294 			remote->name = strndup(imsg.data + sizeof(iremote),
2295 			    iremote.name_len);
2296 			if (remote->name == NULL) {
2297 				err = got_error_from_errno("strndup");
2298 				break;
2299 			}
2300 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2301 			    iremote.name_len, iremote.fetch_url_len);
2302 			if (remote->fetch_url == NULL) {
2303 				err = got_error_from_errno("strndup");
2304 				free_remote_data(remote);
2305 				break;
2306 			}
2307 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2308 			    iremote.name_len + iremote.fetch_url_len,
2309 			    iremote.send_url_len);
2310 			if (remote->send_url == NULL) {
2311 				err = got_error_from_errno("strndup");
2312 				free_remote_data(remote);
2313 				break;
2314 			}
2315 			remote->mirror_references = iremote.mirror_references;
2316 			remote->fetch_all_branches = iremote.fetch_all_branches;
2317 			remote->nfetch_branches = 0;
2318 			remote->fetch_branches = NULL;
2319 			remote->nsend_branches = 0;
2320 			remote->send_branches = NULL;
2321 			remote->nfetch_refs = 0;
2322 			remote->fetch_refs = NULL;
2323 			(*nremotes)++;
2324 			break;
2325 		default:
2326 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2327 			break;
2328 		}
2329 
2330 		imsg_free(&imsg);
2331 		if (err)
2332 			break;
2333 	}
2334 
2335 	if (err) {
2336 		int i;
2337 		for (i = 0; i < *nremotes; i++)
2338 			free_remote_data(&(*remotes)[i]);
2339 		free(*remotes);
2340 		*remotes = NULL;
2341 		*nremotes = 0;
2342 	}
2343 	return err;
2344 }
2345 
2346 const struct got_error *
2347 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2348 {
2349 	const struct got_error *err = NULL;
2350 
2351 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2352 	    NULL, 0) == -1) {
2353 		err = got_error_from_errno("imsg_compose "
2354 		    "GOTCONFIG_PARSE_REQUEST");
2355 		close(fd);
2356 		return err;
2357 	}
2358 
2359 	return flush_imsg(ibuf);
2360 }
2361 
2362 const struct got_error *
2363 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2364 {
2365 	if (imsg_compose(ibuf,
2366 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2367 		return got_error_from_errno("imsg_compose "
2368 		    "GOTCONFIG_AUTHOR_REQUEST");
2369 
2370 	return flush_imsg(ibuf);
2371 }
2372 
2373 const struct got_error *
2374 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2375 {
2376 	if (imsg_compose(ibuf,
2377 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2378 		return got_error_from_errno("imsg_compose "
2379 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2380 
2381 	return flush_imsg(ibuf);
2382 }
2383 
2384 const struct got_error *
2385 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2386 {
2387 	if (imsg_compose(ibuf,
2388 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2389 		return got_error_from_errno("imsg_compose "
2390 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2391 
2392 	return flush_imsg(ibuf);
2393 }
2394 
2395 const struct got_error *
2396 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2397 {
2398 	if (imsg_compose(ibuf,
2399 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2400 		return got_error_from_errno("imsg_compose "
2401 		    "GOTCONFIG_SIGNERID_REQUEST");
2402 
2403 	return flush_imsg(ibuf);
2404 }
2405 
2406 const struct got_error *
2407 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2408 {
2409 	if (imsg_compose(ibuf,
2410 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2411 		return got_error_from_errno("imsg_compose "
2412 		    "GOTCONFIG_REMOTE_REQUEST");
2413 
2414 	return flush_imsg(ibuf);
2415 }
2416 
2417 const struct got_error *
2418 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2419 {
2420 	const struct got_error *err = NULL;
2421 	struct imsg imsg;
2422 	size_t datalen;
2423 
2424 	*str = NULL;
2425 
2426 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2427 	if (err)
2428 		return err;
2429 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2430 
2431 	switch (imsg.hdr.type) {
2432 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2433 		if (datalen == 0)
2434 			break;
2435 		*str = strndup(imsg.data, datalen);
2436 		if (*str == NULL) {
2437 			err = got_error_from_errno("strndup");
2438 			break;
2439 		}
2440 		break;
2441 	default:
2442 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2443 		break;
2444 	}
2445 
2446 	imsg_free(&imsg);
2447 	return err;
2448 }
2449 
2450 const struct got_error *
2451 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2452     int *nremotes, struct imsgbuf *ibuf)
2453 {
2454 	const struct got_error *err = NULL;
2455 	struct imsg imsg;
2456 	size_t datalen;
2457 	struct got_imsg_remotes iremotes;
2458 	struct got_imsg_remote iremote;
2459 	const size_t min_datalen =
2460 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2461 
2462 	*remotes = NULL;
2463 	*nremotes = 0;
2464 	iremotes.nremotes = 0;
2465 
2466 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2467 	if (err)
2468 		return err;
2469 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2470 
2471 	switch (imsg.hdr.type) {
2472 	case GOT_IMSG_GOTCONFIG_REMOTES:
2473 		if (datalen != sizeof(iremotes)) {
2474 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2475 			break;
2476 		}
2477 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2478 		if (iremotes.nremotes < 0) {
2479 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2480 			break;
2481 		}
2482 		if (iremotes.nremotes == 0) {
2483 			imsg_free(&imsg);
2484 			return NULL;
2485 		}
2486 		break;
2487 	default:
2488 		imsg_free(&imsg);
2489 		return got_error(GOT_ERR_PRIVSEP_MSG);
2490 	}
2491 
2492 	imsg_free(&imsg);
2493 
2494 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2495 	if (*remotes == NULL)
2496 		return got_error_from_errno("recallocarray");
2497 
2498 	while (*nremotes < iremotes.nremotes) {
2499 		struct got_remote_repo *remote;
2500 		const size_t min_datalen =
2501 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2502 		int i;
2503 
2504 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2505 		if (err)
2506 			break;
2507 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2508 
2509 		switch (imsg.hdr.type) {
2510 		case GOT_IMSG_GOTCONFIG_REMOTE:
2511 			remote = &(*remotes)[*nremotes];
2512 			memset(remote, 0, sizeof(*remote));
2513 			if (datalen < sizeof(iremote)) {
2514 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2515 				break;
2516 			}
2517 			memcpy(&iremote, imsg.data, sizeof(iremote));
2518 			if (iremote.name_len == 0 ||
2519 			    (iremote.fetch_url_len == 0 &&
2520 			    iremote.send_url_len == 0) ||
2521 			    (sizeof(iremote) + iremote.name_len +
2522 			    iremote.fetch_url_len + iremote.send_url_len) >
2523 			    datalen) {
2524 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2525 				break;
2526 			}
2527 			remote->name = strndup(imsg.data + sizeof(iremote),
2528 			    iremote.name_len);
2529 			if (remote->name == NULL) {
2530 				err = got_error_from_errno("strndup");
2531 				break;
2532 			}
2533 			remote->fetch_url = strndup(imsg.data +
2534 			    sizeof(iremote) + iremote.name_len,
2535 			    iremote.fetch_url_len);
2536 			if (remote->fetch_url == NULL) {
2537 				err = got_error_from_errno("strndup");
2538 				free_remote_data(remote);
2539 				break;
2540 			}
2541 			remote->send_url = strndup(imsg.data +
2542 			    sizeof(iremote) + iremote.name_len +
2543 			    iremote.fetch_url_len, iremote.send_url_len);
2544 			if (remote->send_url == NULL) {
2545 				err = got_error_from_errno("strndup");
2546 				free_remote_data(remote);
2547 				break;
2548 			}
2549 			remote->mirror_references = iremote.mirror_references;
2550 			remote->fetch_all_branches = iremote.fetch_all_branches;
2551 			if (iremote.nfetch_branches > 0) {
2552 				remote->fetch_branches = recallocarray(NULL, 0,
2553 				    iremote.nfetch_branches, sizeof(char *));
2554 				if (remote->fetch_branches == NULL) {
2555 					err = got_error_from_errno("calloc");
2556 					free_remote_data(remote);
2557 					break;
2558 				}
2559 			}
2560 			remote->nfetch_branches = 0;
2561 			for (i = 0; i < iremote.nfetch_branches; i++) {
2562 				char *branch;
2563 				err = got_privsep_recv_gotconfig_str(&branch,
2564 				    ibuf);
2565 				if (err) {
2566 					free_remote_data(remote);
2567 					goto done;
2568 				}
2569 				remote->fetch_branches[i] = branch;
2570 				remote->nfetch_branches++;
2571 			}
2572 			if (iremote.nsend_branches > 0) {
2573 				remote->send_branches = recallocarray(NULL, 0,
2574 				    iremote.nsend_branches, sizeof(char *));
2575 				if (remote->send_branches == NULL) {
2576 					err = got_error_from_errno("calloc");
2577 					free_remote_data(remote);
2578 					break;
2579 				}
2580 			}
2581 			remote->nsend_branches = 0;
2582 			for (i = 0; i < iremote.nsend_branches; i++) {
2583 				char *branch;
2584 				err = got_privsep_recv_gotconfig_str(&branch,
2585 				    ibuf);
2586 				if (err) {
2587 					free_remote_data(remote);
2588 					goto done;
2589 				}
2590 				remote->send_branches[i] = branch;
2591 				remote->nsend_branches++;
2592 			}
2593 			if (iremote.nfetch_refs > 0) {
2594 				remote->fetch_refs = recallocarray(NULL, 0,
2595 				    iremote.nfetch_refs, sizeof(char *));
2596 				if (remote->fetch_refs == NULL) {
2597 					err = got_error_from_errno("calloc");
2598 					free_remote_data(remote);
2599 					break;
2600 				}
2601 			}
2602 			remote->nfetch_refs = 0;
2603 			for (i = 0; i < iremote.nfetch_refs; i++) {
2604 				char *ref;
2605 				err = got_privsep_recv_gotconfig_str(&ref,
2606 				    ibuf);
2607 				if (err) {
2608 					free_remote_data(remote);
2609 					goto done;
2610 				}
2611 				remote->fetch_refs[i] = ref;
2612 				remote->nfetch_refs++;
2613 			}
2614 			(*nremotes)++;
2615 			break;
2616 		default:
2617 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2618 			break;
2619 		}
2620 
2621 		imsg_free(&imsg);
2622 		if (err)
2623 			break;
2624 	}
2625 done:
2626 	if (err) {
2627 		int i;
2628 		for (i = 0; i < *nremotes; i++)
2629 			free_remote_data(&(*remotes)[i]);
2630 		free(*remotes);
2631 		*remotes = NULL;
2632 		*nremotes = 0;
2633 	}
2634 	return err;
2635 }
2636 
2637 const struct got_error *
2638 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2639     struct got_object_id *id, int idx, const char *path)
2640 {
2641 	struct ibuf *wbuf;
2642 	size_t path_len = strlen(path) + 1;
2643 
2644 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2645 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2646 	if (wbuf == NULL)
2647 		return got_error_from_errno(
2648 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2649 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2650 		return got_error_from_errno("imsg_add "
2651 		    "COMMIT_TRAVERSAL_REQUEST");
2652 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2653 		return got_error_from_errno("imsg_add "
2654 		    "COMMIT_TRAVERSAL_REQUEST");
2655 	if (imsg_add(wbuf, path, path_len) == -1)
2656 		return got_error_from_errno("imsg_add "
2657 		    "COMMIT_TRAVERSAL_REQUEST");
2658 
2659 	wbuf->fd = -1;
2660 	imsg_close(ibuf, wbuf);
2661 
2662 	return flush_imsg(ibuf);
2663 }
2664 
2665 const struct got_error *
2666 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2667     struct got_object_id **changed_commit_id,
2668     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2669 {
2670 	const struct got_error *err = NULL;
2671 	struct imsg imsg;
2672 	struct got_imsg_traversed_commits *icommits;
2673 	size_t datalen;
2674 	int i, done = 0;
2675 
2676 	*changed_commit = NULL;
2677 	*changed_commit_id = NULL;
2678 
2679 	while (!done) {
2680 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2681 		if (err)
2682 			return err;
2683 
2684 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2685 		switch (imsg.hdr.type) {
2686 		case GOT_IMSG_TRAVERSED_COMMITS:
2687 			icommits = imsg.data;
2688 			if (datalen != sizeof(*icommits) +
2689 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2690 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2691 				break;
2692 			}
2693 			for (i = 0; i < icommits->ncommits; i++) {
2694 				struct got_object_qid *qid;
2695 				uint8_t *sha1 = (uint8_t *)imsg.data +
2696 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2697 				err = got_object_qid_alloc_partial(&qid);
2698 				if (err)
2699 					break;
2700 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2701 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2702 
2703 				/* The last commit may contain a change. */
2704 				if (i == icommits->ncommits - 1) {
2705 					*changed_commit_id =
2706 					    got_object_id_dup(&qid->id);
2707 					if (*changed_commit_id == NULL) {
2708 						err = got_error_from_errno(
2709 						    "got_object_id_dup");
2710 						break;
2711 					}
2712 				}
2713 			}
2714 			break;
2715 		case GOT_IMSG_COMMIT:
2716 			if (*changed_commit_id == NULL) {
2717 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2718 				break;
2719 			}
2720 			err = get_commit_from_imsg(changed_commit, &imsg,
2721 			    datalen, ibuf);
2722 			break;
2723 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2724 			done = 1;
2725 			break;
2726 		default:
2727 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2728 			break;
2729 		}
2730 
2731 		imsg_free(&imsg);
2732 		if (err)
2733 			break;
2734 	}
2735 
2736 	if (err)
2737 		got_object_id_queue_free(commit_ids);
2738 	return err;
2739 }
2740 
2741 const struct got_error *
2742 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2743     struct got_object_id *tree_id, const char *path,
2744     struct got_parsed_tree_entry *entries, int nentries)
2745 {
2746 	const struct got_error *err = NULL;
2747 	struct ibuf *wbuf;
2748 	size_t path_len = strlen(path);
2749 	size_t msglen;
2750 
2751 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2752 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2753 	if (wbuf == NULL)
2754 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2755 
2756 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2757 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2758 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2759 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2760 	if (imsg_add(wbuf, path, path_len) == -1)
2761 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2762 
2763 	wbuf->fd = -1;
2764 	imsg_close(ibuf, wbuf);
2765 
2766 	if (entries) {
2767 		err = send_tree_entries(ibuf, entries, nentries);
2768 		if (err)
2769 			return err;
2770 	}
2771 
2772 	return flush_imsg(ibuf);
2773 }
2774 
2775 const struct got_error *
2776 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2777 {
2778 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2779 	    0, 0, -1, NULL, 0) == -1)
2780 		return got_error_from_errno("imsg_compose "
2781 		    "OBJECT_ENUMERATION_REQUEST");
2782 
2783 	return flush_imsg(ibuf);
2784 }
2785 
2786 const struct got_error *
2787 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2788 {
2789 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2790 	    0, 0, -1, NULL, 0) == -1)
2791 		return got_error_from_errno("imsg_compose "
2792 		    "OBJECT_ENUMERATION_DONE");
2793 
2794 	return flush_imsg(ibuf);
2795 }
2796 
2797 const struct got_error *
2798 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2799 {
2800 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2801 	    0, 0, -1, NULL, 0) == -1)
2802 		return got_error_from_errno("imsg_compose "
2803 		    "OBJECT_ENUMERATION_INCOMPLETE");
2804 
2805 	return flush_imsg(ibuf);
2806 }
2807 
2808 const struct got_error *
2809 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2810     struct got_object_id *id, time_t mtime)
2811 {
2812 	struct ibuf *wbuf;
2813 
2814 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2815 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2816 	if (wbuf == NULL)
2817 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2818 
2819 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2820 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2821 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2822 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2823 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2824 
2825 	wbuf->fd = -1;
2826 	imsg_close(ibuf, wbuf);
2827 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2828 	return NULL;
2829 }
2830 
2831 const struct got_error *
2832 got_privsep_recv_enumerated_objects(int *found_all_objects,
2833     struct imsgbuf *ibuf,
2834     got_object_enumerate_commit_cb cb_commit,
2835     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2836     struct got_repository *repo)
2837 {
2838 	const struct got_error *err = NULL;
2839 	struct imsg imsg;
2840 	struct got_imsg_enumerated_commit *icommit = NULL;
2841 	struct got_object_id commit_id;
2842 	int have_commit = 0;
2843 	time_t mtime = 0;
2844 	struct got_tree_object tree;
2845 	struct got_imsg_enumerated_tree *itree;
2846 	struct got_object_id tree_id;
2847 	char *path = NULL, *canon_path = NULL;
2848 	size_t datalen, path_len;
2849 	int nentries = -1;
2850 	int done = 0;
2851 
2852 	*found_all_objects = 0;
2853 	memset(&tree, 0, sizeof(tree));
2854 
2855 	while (!done) {
2856 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2857 		if (err)
2858 			break;
2859 
2860 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2861 		switch (imsg.hdr.type) {
2862 		case GOT_IMSG_ENUMERATED_COMMIT:
2863 			if (have_commit && nentries != -1) {
2864 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2865 				break;
2866 			}
2867 			if (datalen != sizeof(*icommit)) {
2868 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2869 				break;
2870 			}
2871 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2872 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2873 			mtime = icommit->mtime;
2874 			have_commit = 1;
2875 			break;
2876 		case GOT_IMSG_ENUMERATED_TREE:
2877 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2878 			if (!have_commit) {
2879 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2880 				break;
2881 			}
2882 			if (datalen < sizeof(*itree)) {
2883 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2884 				break;
2885 			}
2886 			itree = imsg.data;
2887 			path_len = datalen - sizeof(*itree);
2888 			if (path_len == 0) {
2889 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2890 				break;
2891 			}
2892 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2893 			free(path);
2894 			path = strndup(imsg.data + sizeof(*itree), path_len);
2895 			if (path == NULL) {
2896 				err = got_error_from_errno("strndup");
2897 				break;
2898 			}
2899 			free(canon_path);
2900 			canon_path = malloc(path_len + 1);
2901 			if (canon_path == NULL) {
2902 				err = got_error_from_errno("malloc");
2903 				break;
2904 			}
2905 			if (!got_path_is_absolute(path)) {
2906 				err = got_error(GOT_ERR_BAD_PATH);
2907 				break;
2908 			}
2909 			if (got_path_is_root_dir(path)) {
2910 				/* XXX check what got_canonpath() does wrong */
2911 				canon_path[0] = '/';
2912 				canon_path[1] = '\0';
2913 			} else {
2914 				err = got_canonpath(path, canon_path,
2915 				    path_len + 1);
2916 				if (err)
2917 					break;
2918 			}
2919 			if (strcmp(path, canon_path) != 0) {
2920 				err = got_error(GOT_ERR_BAD_PATH);
2921 				break;
2922 			}
2923 			if (nentries != -1) {
2924 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2925 				break;
2926 			}
2927 			if (itree->nentries < -1) {
2928 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2929 				break;
2930 			}
2931 			if (itree->nentries == -1) {
2932 				/* Tree was not found in pack file. */
2933 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2934 				    path, repo);
2935 				break;
2936 			}
2937 			if (itree->nentries > INT_MAX) {
2938 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2939 				break;
2940 			}
2941 			tree.entries = calloc(itree->nentries,
2942 			    sizeof(struct got_tree_entry));
2943 			if (tree.entries == NULL) {
2944 				err = got_error_from_errno("calloc");
2945 				break;
2946 			}
2947 			if (itree->nentries == 0) {
2948 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2949 				    path, repo);
2950 				if (err)
2951 					break;
2952 
2953 				/* Prepare for next tree. */
2954 				free(tree.entries);
2955 				memset(&tree, 0, sizeof(tree));
2956 				nentries = -1;
2957 			} else {
2958 				tree.nentries = itree->nentries;
2959 				nentries = 0;
2960 			}
2961 			break;
2962 		case GOT_IMSG_TREE_ENTRIES:
2963 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2964 			if (nentries <= -1) {
2965 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2966 				break;
2967 			}
2968 			err = recv_tree_entries(imsg.data, datalen,
2969 			    &tree, &nentries);
2970 			if (err)
2971 				break;
2972 			if (tree.nentries == nentries) {
2973 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2974 				    path, repo);
2975 				if (err)
2976 					break;
2977 
2978 				/* Prepare for next tree. */
2979 				free(tree.entries);
2980 				memset(&tree, 0, sizeof(tree));
2981 				nentries = -1;
2982 			}
2983 			break;
2984 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2985 			/* All trees have been found and traversed. */
2986 			if (!have_commit || path == NULL || nentries != -1) {
2987 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2988 				break;
2989 			}
2990 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2991 			if (err)
2992 				break;
2993 			have_commit = 0;
2994 			break;
2995 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2996 			*found_all_objects = 1;
2997 			done = 1;
2998 			break;
2999 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
3000 			done = 1;
3001 			break;
3002 		default:
3003 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3004 			break;
3005 		}
3006 
3007 		imsg_free(&imsg);
3008 		if (err)
3009 			break;
3010 	}
3011 
3012 	free(path);
3013 	free(canon_path);
3014 	free(tree.entries);
3015 	return err;
3016 }
3017 
3018 const struct got_error *
3019 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3020     struct got_object_id *id)
3021 {
3022 	struct got_imsg_raw_delta_request dreq;
3023 
3024 	memset(&dreq, 0, sizeof(dreq));
3025 	dreq.idx = idx;
3026 	memcpy(&dreq.id, id, sizeof(dreq.id));
3027 
3028 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3029 	    &dreq, sizeof(dreq)) == -1)
3030 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3031 
3032 	return flush_imsg(ibuf);
3033 }
3034 
3035 const struct got_error *
3036 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3037 {
3038 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3039 }
3040 
3041 const struct got_error *
3042 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3043     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3044     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3045 {
3046 	struct got_imsg_raw_delta idelta;
3047 	int ret;
3048 
3049 	memset(&idelta, 0, sizeof(idelta));
3050 	idelta.base_size = base_size;
3051 	idelta.result_size = result_size;
3052 	idelta.delta_size = delta_size;
3053 	idelta.delta_compressed_size = delta_compressed_size;
3054 	idelta.delta_offset = delta_offset;
3055 	idelta.delta_out_offset = delta_out_offset;
3056 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3057 
3058 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3059 	    &idelta, sizeof(idelta));
3060 	if (ret == -1)
3061 		return got_error_from_errno("imsg_compose RAW_DELTA");
3062 
3063 	return flush_imsg(ibuf);
3064 }
3065 
3066 const struct got_error *
3067 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3068     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3069     off_t *delta_out_offset, struct got_object_id **base_id,
3070     struct imsgbuf *ibuf)
3071 {
3072 	const struct got_error *err = NULL;
3073 	struct imsg imsg;
3074 	struct got_imsg_raw_delta *delta;
3075 	size_t datalen;
3076 
3077 	*base_size = 0;
3078 	*result_size = 0;
3079 	*delta_size = 0;
3080 	*delta_compressed_size = 0;
3081 	*delta_offset = 0;
3082 	*delta_out_offset = 0;
3083 	*base_id = NULL;
3084 
3085 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3086 	if (err)
3087 		return err;
3088 
3089 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3090 
3091 	switch (imsg.hdr.type) {
3092 	case GOT_IMSG_RAW_DELTA:
3093 		if (datalen != sizeof(*delta)) {
3094 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3095 			break;
3096 		}
3097 		delta = imsg.data;
3098 		*base_size = delta->base_size;
3099 		*result_size = delta->result_size;
3100 		*delta_size = delta->delta_size;
3101 		*delta_compressed_size = delta->delta_compressed_size;
3102 		*delta_offset = delta->delta_offset;
3103 		*delta_out_offset = delta->delta_out_offset;
3104 		*base_id = calloc(1, sizeof(**base_id));
3105 		if (*base_id == NULL) {
3106 			err = got_error_from_errno("malloc");
3107 			break;
3108 		}
3109 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3110 		break;
3111 	default:
3112 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3113 		break;
3114 	}
3115 
3116 	imsg_free(&imsg);
3117 
3118 	if (err) {
3119 		free(*base_id);
3120 		*base_id = NULL;
3121 	}
3122 	return err;
3123 }
3124 
3125 static const struct got_error *
3126 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3127 {
3128 	const struct got_error *err = NULL;
3129 	struct got_imsg_object_idlist idlist;
3130 	struct ibuf *wbuf;
3131 	size_t i;
3132 
3133 	memset(&idlist, 0, sizeof(idlist));
3134 
3135 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3136 		return got_error(GOT_ERR_NO_SPACE);
3137 
3138 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3139 	    sizeof(idlist) + nids * sizeof(**ids));
3140 	if (wbuf == NULL) {
3141 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3142 		return err;
3143 	}
3144 
3145 	idlist.nids = nids;
3146 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3147 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3148 
3149 	for (i = 0; i < nids; i++) {
3150 		struct got_object_id *id = ids[i];
3151 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3152 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3153 	}
3154 
3155 	wbuf->fd = -1;
3156 	imsg_close(ibuf, wbuf);
3157 
3158 	return flush_imsg(ibuf);
3159 }
3160 
3161 const struct got_error *
3162 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3163     struct got_object_id **ids, size_t nids)
3164 {
3165 	const struct got_error *err = NULL;
3166 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3167 	int i, queued = 0;
3168 
3169 	for (i = 0; i < nids; i++) {
3170 		idlist[i % nitems(idlist)] = ids[i];
3171 		queued++;
3172 		if (queued >= nitems(idlist)) {
3173 			err = send_idlist(ibuf, idlist, queued);
3174 			if (err)
3175 				return err;
3176 			queued = 0;
3177 		}
3178 	}
3179 
3180 	if (queued > 0) {
3181 		err = send_idlist(ibuf, idlist, queued);
3182 		if (err)
3183 			return err;
3184 	}
3185 
3186 	return NULL;
3187 }
3188 
3189 const struct got_error *
3190 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3191 {
3192 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3193 	    == -1)
3194 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3195 
3196 	return flush_imsg(ibuf);
3197 }
3198 
3199 const struct got_error *
3200 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3201     size_t *nids, struct imsgbuf *ibuf)
3202 {
3203 	const struct got_error *err = NULL;
3204 	struct imsg imsg;
3205 	struct got_imsg_object_idlist *idlist;
3206 	size_t datalen;
3207 
3208 	*ids = NULL;
3209 	*done = 0;
3210 	*nids = 0;
3211 
3212 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3213 	if (err)
3214 		return err;
3215 
3216 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3217 	switch (imsg.hdr.type) {
3218 	case GOT_IMSG_OBJ_ID_LIST:
3219 		if (datalen < sizeof(*idlist)) {
3220 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3221 			break;
3222 		}
3223 		idlist = imsg.data;
3224 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3225 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3226 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3227 			break;
3228 		}
3229 		*nids = idlist->nids;
3230 		*ids = calloc(*nids, sizeof(**ids));
3231 		if (*ids == NULL) {
3232 			err = got_error_from_errno("calloc");
3233 			break;
3234 		}
3235 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3236 		    *nids * sizeof(**ids));
3237 		break;
3238 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3239 		*done = 1;
3240 		break;
3241 	default:
3242 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3243 		break;
3244 	}
3245 
3246 	imsg_free(&imsg);
3247 
3248 	return err;
3249 }
3250 
3251 const struct got_error *
3252 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3253 {
3254 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3255 	    == -1)
3256 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3257 
3258 	return flush_imsg(ibuf);
3259 }
3260 
3261 const struct got_error *
3262 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3263     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3264 {
3265 	const struct got_error *err = NULL;
3266 	struct ibuf *wbuf;
3267 	struct got_imsg_reused_deltas ideltas;
3268 	size_t i;
3269 
3270 	memset(&ideltas, 0, sizeof(ideltas));
3271 
3272 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3273 		return got_error(GOT_ERR_NO_SPACE);
3274 
3275 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3276 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3277 	if (wbuf == NULL) {
3278 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3279 		return err;
3280 	}
3281 
3282 	ideltas.ndeltas = ndeltas;
3283 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3284 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3285 
3286 	for (i = 0; i < ndeltas; i++) {
3287 		struct got_imsg_reused_delta *delta = &deltas[i];
3288 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3289 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3290 	}
3291 
3292 	wbuf->fd = -1;
3293 	imsg_close(ibuf, wbuf);
3294 
3295 	return flush_imsg(ibuf);
3296 }
3297 
3298 const struct got_error *
3299 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3300 {
3301 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3302 	    == -1)
3303 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3304 
3305 	return flush_imsg(ibuf);
3306 }
3307 
3308 const struct got_error *
3309 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3310     size_t *ndeltas, struct imsgbuf *ibuf)
3311 {
3312 	const struct got_error *err = NULL;
3313 	struct imsg imsg;
3314 	struct got_imsg_reused_deltas *ideltas;
3315 	size_t datalen;
3316 
3317 	*done = 0;
3318 	*ndeltas = 0;
3319 
3320 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3321 	if (err)
3322 		return err;
3323 
3324 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3325 	switch (imsg.hdr.type) {
3326 	case GOT_IMSG_REUSED_DELTAS:
3327 		if (datalen < sizeof(*ideltas)) {
3328 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3329 			break;
3330 		}
3331 		ideltas = imsg.data;
3332 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3333 		    ideltas->ndeltas * sizeof(*deltas) >
3334 		    datalen - sizeof(*ideltas)) {
3335 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3336 			break;
3337 		}
3338 		*ndeltas = ideltas->ndeltas;
3339 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3340 		    *ndeltas * sizeof(*deltas));
3341 		break;
3342 	case GOT_IMSG_DELTA_REUSE_DONE:
3343 		*done = 1;
3344 		break;
3345 	default:
3346 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3347 		break;
3348 	}
3349 
3350 	imsg_free(&imsg);
3351 
3352 	return err;
3353 }
3354 
3355 const struct got_error *
3356 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3357 {
3358 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3359 	    0, 0, -1, NULL, 0)
3360 	    == -1)
3361 		return got_error_from_errno("imsg_compose "
3362 		    "COMMIT_PAINTING_INIT");
3363 
3364 	return flush_imsg(ibuf);
3365 }
3366 
3367 const struct got_error *
3368 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3369     struct got_object_id *id, intptr_t color)
3370 {
3371 	struct got_imsg_commit_painting_request ireq;
3372 
3373 	memset(&ireq, 0, sizeof(ireq));
3374 	memcpy(ireq.id, id->sha1, sizeof(ireq.id));
3375 	ireq.idx = idx;
3376 	ireq.color = color;
3377 
3378 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3379 	    &ireq, sizeof(ireq)) == -1)
3380 		return got_error_from_errno("imsg_compose "
3381 		    "COMMIT_PAINTING_REQUEST");
3382 
3383 	return flush_imsg(ibuf);
3384 }
3385 
3386 static const struct got_error *
3387 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3388     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3389 {
3390 	const struct got_error *err = NULL;
3391 	struct ibuf *wbuf = NULL;
3392 	struct got_object_qid *qid;
3393 	size_t msglen;
3394 	int ncommits;
3395 	intptr_t color;
3396 
3397 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3398 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3399 	    sizeof(struct got_imsg_painted_commit);
3400 
3401 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3402 	if (wbuf == NULL) {
3403 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3404 		return err;
3405 	}
3406 
3407 	/* Keep in sync with struct got_imsg_painted_commits! */
3408 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3409 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3410 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3411 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3412 
3413 	while (ncommits > 0) {
3414 		qid = STAILQ_FIRST(ids);
3415 		STAILQ_REMOVE_HEAD(ids, entry);
3416 		ncommits--;
3417 		(*nids)--;
3418 		color = (intptr_t)qid->data;
3419 
3420 		/* Keep in sync with struct got_imsg_painted_commit! */
3421 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3422 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3423 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3424 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3425 
3426 		got_object_qid_free(qid);
3427 	}
3428 
3429 	wbuf->fd = -1;
3430 	imsg_close(ibuf, wbuf);
3431 
3432 	return flush_imsg(ibuf);
3433 }
3434 
3435 const struct got_error *
3436 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3437     struct got_object_id_queue *ids, int *nids,
3438     int present_in_pack, int flush)
3439 {
3440 	const struct got_error *err;
3441 	size_t remain;
3442 
3443 	if (*nids <= 0)
3444 		return NULL;
3445 
3446 	do {
3447 		remain = (sizeof(struct got_imsg_painted_commits)) +
3448 		    *nids * sizeof(struct got_imsg_painted_commit);
3449 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3450 			err = send_painted_commits(ids, nids, remain,
3451 			    present_in_pack, ibuf);
3452 			if (err)
3453 				return err;
3454 		}
3455 	} while (flush && *nids > 0);
3456 
3457 	return NULL;
3458 }
3459 
3460 const struct got_error *
3461 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3462 {
3463 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3464 	    0, 0, -1, NULL, 0)
3465 	    == -1)
3466 		return got_error_from_errno("imsg_compose "
3467 		    "COMMIT_PAINTING_DONE");
3468 
3469 	return flush_imsg(ibuf);
3470 }
3471 
3472 const struct got_error *
3473 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3474     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3475 {
3476 	const struct got_error *err = NULL;
3477 	struct imsg imsg;
3478 	struct got_imsg_painted_commits icommits;
3479 	struct got_imsg_painted_commit icommit;
3480 	size_t datalen;
3481 	int i;
3482 
3483 	for (;;) {
3484 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3485 		if (err)
3486 			return err;
3487 
3488 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3489 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3490 			break;
3491 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3492 			return got_error(GOT_ERR_PRIVSEP_MSG);
3493 
3494 		if (datalen < sizeof(icommits))
3495 			return got_error(GOT_ERR_PRIVSEP_LEN);
3496 		memcpy(&icommits, imsg.data, sizeof(icommits));
3497 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3498 		    datalen < sizeof(icommits) +
3499 		    icommits.ncommits * sizeof(icommit))
3500 			return got_error(GOT_ERR_PRIVSEP_LEN);
3501 
3502 		for (i = 0; i < icommits.ncommits; i++) {
3503 			memcpy(&icommit,
3504 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3505 			    sizeof(icommit));
3506 
3507 			if (icommits.present_in_pack) {
3508 				struct got_object_id id;
3509 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3510 				err = cb(cb_arg, &id, icommit.color);
3511 				if (err)
3512 					break;
3513 			} else {
3514 				struct got_object_qid *qid;
3515 				err = got_object_qid_alloc_partial(&qid);
3516 				if (err)
3517 					break;
3518 				memcpy(qid->id.sha1, icommit.id,
3519 				    SHA1_DIGEST_LENGTH);
3520 				qid->data = (void *)icommit.color;
3521 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3522 			}
3523 		}
3524 
3525 		imsg_free(&imsg);
3526 	}
3527 
3528 	return err;
3529 }
3530 
3531 const struct got_error *
3532 got_privsep_unveil_exec_helpers(void)
3533 {
3534 	const char *helpers[] = {
3535 	    GOT_PATH_PROG_READ_PACK,
3536 	    GOT_PATH_PROG_READ_OBJECT,
3537 	    GOT_PATH_PROG_READ_COMMIT,
3538 	    GOT_PATH_PROG_READ_TREE,
3539 	    GOT_PATH_PROG_READ_BLOB,
3540 	    GOT_PATH_PROG_READ_TAG,
3541 	    GOT_PATH_PROG_READ_GITCONFIG,
3542 	    GOT_PATH_PROG_READ_GOTCONFIG,
3543 	    GOT_PATH_PROG_READ_PATCH,
3544 	    GOT_PATH_PROG_FETCH_PACK,
3545 	    GOT_PATH_PROG_INDEX_PACK,
3546 	    GOT_PATH_PROG_SEND_PACK,
3547 	};
3548 	size_t i;
3549 
3550 	for (i = 0; i < nitems(helpers); i++) {
3551 		if (unveil(helpers[i], "x") == 0)
3552 			continue;
3553 		return got_error_from_errno2("unveil", helpers[i]);
3554 	}
3555 
3556 	return NULL;
3557 }
3558 
3559 void
3560 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3561 {
3562 	if (close(imsg_fds[0]) == -1) {
3563 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3564 		_exit(1);
3565 	}
3566 
3567 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3568 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3569 		_exit(1);
3570 	}
3571 
3572 	closefrom(GOT_IMSG_FD_CHILD + 1);
3573 
3574 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3575 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3576 		    strerror(errno));
3577 		_exit(1);
3578 	}
3579 }