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