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Date:: Mon Feb 13 15:18:46 2023 UTC
Message:: enumerated_objects expect SHA1 digests still
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1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <sha2.h>
35 #include <unistd.h>
36 #include <zlib.h>
37 
38 #include "got_object.h"
39 #include "got_error.h"
40 #include "got_path.h"
41 #include "got_repository.h"
42 
43 #include "got_lib_hash.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
50 #include "got_lib_poll.h"
51 
52 #include "got_privsep.h"
53 
54 #ifndef MIN
55 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
56 #endif
57 
58 #ifndef nitems
59 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
60 #endif
61 
62 static const struct got_error *
63 read_imsg(struct imsgbuf *ibuf)
64 {
65 	const struct got_error *err;
66 	size_t n;
67 
68 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
69 	if (err) {
70 		if (err->code == GOT_ERR_EOF)
71 			return got_error(GOT_ERR_PRIVSEP_PIPE);
72 		return err;
73 	}
74 
75 	n = imsg_read(ibuf);
76 	if (n == -1) {
77 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
78 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
79 		return got_error(GOT_ERR_PRIVSEP_READ);
80 	}
81 	if (n == 0)
82 		return got_error(GOT_ERR_PRIVSEP_PIPE);
83 
84 	return NULL;
85 }
86 
87 const struct got_error *
88 got_privsep_wait_for_child(pid_t pid)
89 {
90 	int child_status;
91 
92 	if (waitpid(pid, &child_status, 0) == -1)
93 		return got_error_from_errno("waitpid");
94 
95 	if (!WIFEXITED(child_status))
96 		return got_error(GOT_ERR_PRIVSEP_DIED);
97 
98 	if (WEXITSTATUS(child_status) != 0)
99 		return got_error(GOT_ERR_PRIVSEP_EXIT);
100 
101 	return NULL;
102 }
103 
104 static const struct got_error *
105 recv_imsg_error(struct imsg *imsg, size_t datalen)
106 {
107 	struct got_imsg_error *ierr;
108 
109 	if (datalen != sizeof(*ierr))
110 		return got_error(GOT_ERR_PRIVSEP_LEN);
111 
112 	ierr = imsg->data;
113 	if (ierr->code == GOT_ERR_ERRNO) {
114 		static struct got_error serr;
115 		serr.code = GOT_ERR_ERRNO;
116 		serr.msg = strerror(ierr->errno_code);
117 		return &serr;
118 	}
119 
120 	return got_error(ierr->code);
121 }
122 
123 const struct got_error *
124 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
125     size_t min_datalen)
126 {
127 	const struct got_error *err;
128 	ssize_t n;
129 
130 	n = imsg_get(ibuf, imsg);
131 	if (n == -1)
132 		return got_error_from_errno("imsg_get");
133 
134 	while (n == 0) {
135 		err = read_imsg(ibuf);
136 		if (err)
137 			return err;
138 		n = imsg_get(ibuf, imsg);
139 		if (n == -1)
140 			return got_error_from_errno("imsg_get");
141 	}
142 
143 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
144 		return got_error(GOT_ERR_PRIVSEP_LEN);
145 
146 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
147 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
148 		return recv_imsg_error(imsg, datalen);
149 	}
150 
151 	return NULL;
152 }
153 
154 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
155 void
156 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
157 {
158 	const struct got_error *poll_err;
159 	struct got_imsg_error ierr;
160 	int ret;
161 
162 	ierr.code = err->code;
163 	if (err->code == GOT_ERR_ERRNO)
164 		ierr.errno_code = errno;
165 	else
166 		ierr.errno_code = 0;
167 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
168 	if (ret == -1) {
169 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
170 		    getprogname(), err->code, err->msg, strerror(errno));
171 		return;
172 	}
173 
174 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
175 	if (poll_err) {
176 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
177 		    getprogname(), err->code, err->msg, poll_err->msg);
178 		return;
179 	}
180 
181 	ret = imsg_flush(ibuf);
182 	if (ret == -1) {
183 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
184 		    getprogname(), err->code, err->msg, strerror(errno));
185 		imsg_clear(ibuf);
186 		return;
187 	}
188 }
189 
190 static const struct got_error *
191 flush_imsg(struct imsgbuf *ibuf)
192 {
193 	const struct got_error *err;
194 
195 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
196 	if (err)
197 		return err;
198 
199 	if (imsg_flush(ibuf) == -1) {
200 		imsg_clear(ibuf);
201 		return got_error_from_errno("imsg_flush");
202 	}
203 
204 	return NULL;
205 }
206 
207 const struct got_error *
208 got_privsep_flush_imsg(struct imsgbuf *ibuf)
209 {
210 	return flush_imsg(ibuf);
211 }
212 
213 const struct got_error *
214 got_privsep_send_stop(int fd)
215 {
216 	const struct got_error *err = NULL;
217 	struct imsgbuf ibuf;
218 
219 	imsg_init(&ibuf, fd);
220 
221 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
222 		return got_error_from_errno("imsg_compose STOP");
223 
224 	err = flush_imsg(&ibuf);
225 	return err;
226 }
227 
228 const struct got_error *
229 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
230     struct got_object_id *id)
231 {
232 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
233 	    id, sizeof(*id)) == -1)
234 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
235 
236 	return flush_imsg(ibuf);
237 }
238 
239 const struct got_error *
240 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
241     struct got_object_id *id)
242 {
243 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
244 	    id, sizeof(*id)) == -1)
245 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
246 
247 	return flush_imsg(ibuf);
248 }
249 
250 const struct got_error *
251 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
252 {
253 	const struct got_error *err = NULL;
254 
255 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
256 	    == -1) {
257 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
258 		close(outfd);
259 		return err;
260 	}
261 
262 	return flush_imsg(ibuf);
263 }
264 
265 const struct got_error *
266 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
267     uint8_t *data)
268 {
269 	const struct got_error *err = NULL;
270 	struct got_imsg_raw_obj iobj;
271 	size_t len = sizeof(iobj);
272 	struct ibuf *wbuf;
273 
274 	memset(&iobj, 0, sizeof(iobj));
275 	iobj.hdrlen = hdrlen;
276 	iobj.size = size;
277 
278 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
279 		len += (size_t)size + hdrlen;
280 
281 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
282 	if (wbuf == NULL) {
283 		err = got_error_from_errno("imsg_create RAW_OBJECT");
284 		return err;
285 	}
286 
287 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
288 		return got_error_from_errno("imsg_add RAW_OBJECT");
289 
290 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
291 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
292 			return got_error_from_errno("imsg_add RAW_OBJECT");
293 	}
294 
295 	wbuf->fd = -1;
296 	imsg_close(ibuf, wbuf);
297 
298 	return flush_imsg(ibuf);
299 }
300 
301 const struct got_error *
302 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
303     struct imsgbuf *ibuf)
304 {
305 	const struct got_error *err = NULL;
306 	struct imsg imsg;
307 	struct got_imsg_raw_obj *iobj;
308 	size_t datalen;
309 
310 	*outbuf = NULL;
311 
312 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
313 	if (err)
314 		return err;
315 
316 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
317 
318 	switch (imsg.hdr.type) {
319 	case GOT_IMSG_RAW_OBJECT:
320 		if (datalen < sizeof(*iobj)) {
321 			err = got_error(GOT_ERR_PRIVSEP_LEN);
322 			break;
323 		}
324 		iobj = imsg.data;
325 		*size = iobj->size;
326 		*hdrlen = iobj->hdrlen;
327 
328 		if (datalen == sizeof(*iobj)) {
329 			/* Data has been written to file descriptor. */
330 			break;
331 		}
332 
333 		if (*size < 0 ||
334 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
335 			err = got_error(GOT_ERR_PRIVSEP_LEN);
336 			break;
337 		}
338 
339 		*outbuf = malloc(*size + *hdrlen);
340 		if (*outbuf == NULL) {
341 			err = got_error_from_errno("malloc");
342 			break;
343 		}
344 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
345 		break;
346 	default:
347 		err = got_error(GOT_ERR_PRIVSEP_MSG);
348 		break;
349 	}
350 
351 	imsg_free(&imsg);
352 
353 	return err;
354 }
355 
356 const struct got_error *
357 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
358     struct got_object_id *id, int pack_idx)
359 {
360 	const struct got_error *err = NULL;
361 	struct got_imsg_packed_object iobj;
362 	void *data;
363 	size_t len;
364 
365 	memset(&iobj, 0, sizeof(iobj));
366 	if (pack_idx != -1) { /* commit is packed */
367 		iobj.idx = pack_idx;
368 		memcpy(&iobj.id, id, sizeof(iobj.id));
369 		data = &iobj;
370 		len = sizeof(iobj);
371 	} else {
372 		data = id;
373 		len = sizeof(*id);
374 	}
375 
376 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
377 	    == -1) {
378 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
379 		close(fd);
380 		return err;
381 	}
382 
383 	return flush_imsg(ibuf);
384 }
385 
386 const struct got_error *
387 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
388     struct got_object_id *id, int pack_idx)
389 {
390 	struct ibuf *wbuf;
391 	size_t len;
392 
393 	if (pack_idx != -1)
394 		len = sizeof(struct got_imsg_packed_object);
395 	else
396 		len = sizeof(*id);
397 
398 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
399 	if (wbuf == NULL)
400 		return got_error_from_errno("imsg_create TREE_REQUEST");
401 
402 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
403 		return got_error_from_errno("imsg_add TREE_REQUEST");
404 
405 	if (pack_idx != -1) { /* tree is packed */
406 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
407 			return got_error_from_errno("imsg_add TREE_REQUEST");
408 	}
409 
410 	wbuf->fd = fd;
411 	imsg_close(ibuf, wbuf);
412 
413 	return flush_imsg(ibuf);
414 }
415 
416 const struct got_error *
417 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
418     struct got_object_id *id, int pack_idx)
419 {
420 	struct got_imsg_packed_object iobj;
421 	void *data;
422 	size_t len;
423 
424 	memset(&iobj, 0, sizeof(iobj));
425 	if (pack_idx != -1) { /* tag is packed */
426 		iobj.idx = pack_idx;
427 		memcpy(&iobj.id, id, sizeof(iobj.id));
428 		data = &iobj;
429 		len = sizeof(iobj);
430 	} else {
431 		data = id;
432 		len = sizeof(*id);
433 	}
434 
435 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
436 	    == -1)
437 		return got_error_from_errno("imsg_compose TAG_REQUEST");
438 
439 	return flush_imsg(ibuf);
440 }
441 
442 const struct got_error *
443 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
444     struct got_object_id *id, int pack_idx)
445 {
446 	const struct got_error *err = NULL;
447 	struct got_imsg_packed_object iobj;
448 	void *data;
449 	size_t len;
450 
451 	memset(&iobj, 0, sizeof(iobj));
452 	if (pack_idx != -1) { /* blob is packed */
453 		iobj.idx = pack_idx;
454 		memcpy(&iobj.id, id, sizeof(iobj.id));
455 		data = &iobj;
456 		len = sizeof(iobj);
457 	} else {
458 		data = id;
459 		len = sizeof(*id);
460 	}
461 
462 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
463 	    == -1) {
464 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
465 		close(infd);
466 		return err;
467 	}
468 
469 	return flush_imsg(ibuf);
470 }
471 
472 const struct got_error *
473 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
474 {
475 	const struct got_error *err = NULL;
476 
477 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
478 	    == -1) {
479 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
480 		close(outfd);
481 		return err;
482 	}
483 
484 	return flush_imsg(ibuf);
485 }
486 
487 static const struct got_error *
488 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
489 {
490 	const struct got_error *err = NULL;
491 
492 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
493 		err = got_error_from_errno("imsg_compose TMPFD");
494 		close(fd);
495 		return err;
496 	}
497 
498 	return flush_imsg(ibuf);
499 }
500 
501 const struct got_error *
502 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
503 {
504 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
505 }
506 
507 const struct got_error *
508 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
509 {
510 	struct got_imsg_object iobj;
511 
512 	memset(&iobj, 0, sizeof(iobj));
513 
514 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
515 	iobj.type = obj->type;
516 	iobj.flags = obj->flags;
517 	iobj.hdrlen = obj->hdrlen;
518 	iobj.size = obj->size;
519 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
520 		iobj.pack_offset = obj->pack_offset;
521 		iobj.pack_idx = obj->pack_idx;
522 	}
523 
524 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
525 	    == -1)
526 		return got_error_from_errno("imsg_compose OBJECT");
527 
528 	return flush_imsg(ibuf);
529 }
530 
531 const struct got_error *
532 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
533     struct got_pathlist_head *have_refs, int fetch_all_branches,
534     struct got_pathlist_head *wanted_branches,
535     struct got_pathlist_head *wanted_refs, int list_refs_only,
536     const char *worktree_branch, int verbosity)
537 {
538 	const struct got_error *err = NULL;
539 	struct ibuf *wbuf;
540 	size_t len, worktree_branch_len;
541 	struct got_pathlist_entry *pe;
542 	struct got_imsg_fetch_request fetchreq;
543 
544 	if (worktree_branch) {
545 		worktree_branch_len = strlen(worktree_branch);
546 		len = sizeof(fetchreq) + worktree_branch_len;
547 	} else
548 		len = sizeof(fetchreq);
549 
550 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
551 		close(fd);
552 		return got_error(GOT_ERR_NO_SPACE);
553 	}
554 
555 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
556 	if (wbuf == NULL)
557 		return got_error_from_errno("imsg_create FETCH_HAVE_REF");
558 
559 	memset(&fetchreq, 0, sizeof(fetchreq));
560 	fetchreq.fetch_all_branches = fetch_all_branches;
561 	fetchreq.list_refs_only = list_refs_only;
562 	fetchreq.verbosity = verbosity;
563 	if (worktree_branch != NULL)
564 		fetchreq.worktree_branch_len = worktree_branch_len;
565 	TAILQ_FOREACH(pe, have_refs, entry)
566 		fetchreq.n_have_refs++;
567 	TAILQ_FOREACH(pe, wanted_branches, entry)
568 		fetchreq.n_wanted_branches++;
569 	TAILQ_FOREACH(pe, wanted_refs, entry)
570 		fetchreq.n_wanted_refs++;
571 	if (imsg_add(wbuf, &fetchreq, sizeof(fetchreq)) == -1)
572 		return got_error_from_errno("imsg_add FETCH_REQUEST");
573 	if (worktree_branch) {
574 		if (imsg_add(wbuf, worktree_branch, worktree_branch_len) == -1)
575 			return got_error_from_errno("imsg_add FETCH_REQUEST");
576 	}
577 	wbuf->fd = fd;
578 	imsg_close(ibuf, wbuf);
579 
580 	err = flush_imsg(ibuf);
581 	if (err) {
582 		close(fd);
583 		return err;
584 	}
585 	fd = -1;
586 
587 	TAILQ_FOREACH(pe, have_refs, entry) {
588 		const char *name = pe->path;
589 		size_t name_len = pe->path_len;
590 		struct got_object_id *id = pe->data;
591 
592 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
593 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
594 		if (wbuf == NULL)
595 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
596 
597 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
598 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
599 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
600 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
601 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
602 		if (imsg_add(wbuf, name, name_len) == -1)
603 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
604 
605 		wbuf->fd = -1;
606 		imsg_close(ibuf, wbuf);
607 		err = flush_imsg(ibuf);
608 		if (err)
609 			return err;
610 	}
611 
612 	TAILQ_FOREACH(pe, wanted_branches, entry) {
613 		const char *name = pe->path;
614 		size_t name_len = pe->path_len;
615 
616 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
617 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
618 		    len);
619 		if (wbuf == NULL)
620 			return got_error_from_errno(
621 			    "imsg_create FETCH_WANTED_BRANCH");
622 
623 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
624 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
625 			return got_error_from_errno(
626 			    "imsg_add FETCH_WANTED_BRANCH");
627 		if (imsg_add(wbuf, name, name_len) == -1)
628 			return got_error_from_errno(
629 			    "imsg_add FETCH_WANTED_BRANCH");
630 
631 		wbuf->fd = -1;
632 		imsg_close(ibuf, wbuf);
633 		err = flush_imsg(ibuf);
634 		if (err)
635 			return err;
636 	}
637 
638 	TAILQ_FOREACH(pe, wanted_refs, entry) {
639 		const char *name = pe->path;
640 		size_t name_len = pe->path_len;
641 
642 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
643 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
644 		    len);
645 		if (wbuf == NULL)
646 			return got_error_from_errno(
647 			    "imsg_create FETCH_WANTED_REF");
648 
649 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
650 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
651 			return got_error_from_errno(
652 			    "imsg_add FETCH_WANTED_REF");
653 		if (imsg_add(wbuf, name, name_len) == -1)
654 			return got_error_from_errno(
655 			    "imsg_add FETCH_WANTED_REF");
656 
657 		wbuf->fd = -1;
658 		imsg_close(ibuf, wbuf);
659 		err = flush_imsg(ibuf);
660 		if (err)
661 			return err;
662 	}
663 
664 
665 	return NULL;
666 
667 }
668 
669 const struct got_error *
670 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
671 {
672 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
673 }
674 
675 const struct got_error *
676 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
677     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
678     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
679 {
680 	const struct got_error *err = NULL;
681 	struct imsg imsg;
682 	size_t datalen;
683 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
684 	size_t n, remain;
685 	off_t off;
686 	int i;
687 
688 	*done = 0;
689 	*id = NULL;
690 	*refname = NULL;
691 	*server_progress = NULL;
692 	*packfile_size = 0;
693 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
694 
695 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
696 	if (err)
697 		return err;
698 
699 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
700 	switch (imsg.hdr.type) {
701 	case GOT_IMSG_FETCH_SYMREFS:
702 		if (datalen < sizeof(*isymrefs)) {
703 			err = got_error(GOT_ERR_PRIVSEP_LEN);
704 			break;
705 		}
706 		if (isymrefs != NULL) {
707 			err = got_error(GOT_ERR_PRIVSEP_MSG);
708 			break;
709 		}
710 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
711 		off = sizeof(*isymrefs);
712 		remain = datalen - off;
713 		for (n = 0; n < isymrefs->nsymrefs; n++) {
714 			struct got_imsg_fetch_symref *s;
715 			char *name, *target;
716 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
717 				err = got_error(GOT_ERR_PRIVSEP_LEN);
718 				goto done;
719 			}
720 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
721 			off += sizeof(*s);
722 			remain -= sizeof(*s);
723 			if (remain < s->name_len) {
724 				err = got_error(GOT_ERR_PRIVSEP_LEN);
725 				goto done;
726 			}
727 			name = strndup(imsg.data + off, s->name_len);
728 			if (name == NULL) {
729 				err = got_error_from_errno("strndup");
730 				goto done;
731 			}
732 			off += s->name_len;
733 			remain -= s->name_len;
734 			if (remain < s->target_len) {
735 				err = got_error(GOT_ERR_PRIVSEP_LEN);
736 				free(name);
737 				goto done;
738 			}
739 			target = strndup(imsg.data + off, s->target_len);
740 			if (target == NULL) {
741 				err = got_error_from_errno("strndup");
742 				free(name);
743 				goto done;
744 			}
745 			off += s->target_len;
746 			remain -= s->target_len;
747 			err = got_pathlist_append(symrefs, name, target);
748 			if (err) {
749 				free(name);
750 				free(target);
751 				goto done;
752 			}
753 		}
754 		break;
755 	case GOT_IMSG_FETCH_REF:
756 		if (datalen <= sizeof(**id)) {
757 			err = got_error(GOT_ERR_PRIVSEP_MSG);
758 			break;
759 		}
760 		*id = malloc(sizeof(**id));
761 		if (*id == NULL) {
762 			err = got_error_from_errno("malloc");
763 			break;
764 		}
765 		memcpy(*id, imsg.data, sizeof(**id));
766 		*refname = strndup(imsg.data + sizeof(**id),
767 		    datalen - sizeof(**id));
768 		if (*refname == NULL) {
769 			err = got_error_from_errno("strndup");
770 			break;
771 		}
772 		break;
773 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
774 		if (datalen == 0) {
775 			err = got_error(GOT_ERR_PRIVSEP_LEN);
776 			break;
777 		}
778 		*server_progress = strndup(imsg.data, datalen);
779 		if (*server_progress == NULL) {
780 			err = got_error_from_errno("strndup");
781 			break;
782 		}
783 		for (i = 0; i < datalen; i++) {
784 			if (!isprint((unsigned char)(*server_progress)[i]) &&
785 			    !isspace((unsigned char)(*server_progress)[i])) {
786 				err = got_error(GOT_ERR_PRIVSEP_MSG);
787 				free(*server_progress);
788 				*server_progress = NULL;
789 				goto done;
790 			}
791 		}
792 		break;
793 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
794 		if (datalen < sizeof(*packfile_size)) {
795 			err = got_error(GOT_ERR_PRIVSEP_MSG);
796 			break;
797 		}
798 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
799 		break;
800 	case GOT_IMSG_FETCH_DONE:
801 		if (datalen != SHA1_DIGEST_LENGTH) {
802 			err = got_error(GOT_ERR_PRIVSEP_MSG);
803 			break;
804 		}
805 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
806 		*done = 1;
807 		break;
808 	default:
809 		err = got_error(GOT_ERR_PRIVSEP_MSG);
810 		break;
811 	}
812 done:
813 	if (err) {
814 		free(*id);
815 		*id = NULL;
816 		free(*refname);
817 		*refname = NULL;
818 	}
819 	imsg_free(&imsg);
820 	return err;
821 }
822 
823 static const struct got_error *
824 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
825     int delete, struct imsgbuf *ibuf)
826 {
827 	size_t len;
828 	struct ibuf *wbuf;
829 
830 	len = sizeof(struct got_imsg_send_ref) + name_len;
831 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
832 	if (wbuf == NULL)
833 		return got_error_from_errno("imsg_create SEND_REF");
834 
835 	/* Keep in sync with struct got_imsg_send_ref! */
836 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
837 		return got_error_from_errno("imsg_add SEND_REF");
838 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
839 		return got_error_from_errno("imsg_add SEND_REF");
840 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
841 		return got_error_from_errno("imsg_add SEND_REF");
842 	if (imsg_add(wbuf, name, name_len) == -1)
843 		return got_error_from_errno("imsg_add SEND_REF");
844 
845 	wbuf->fd = -1;
846 	imsg_close(ibuf, wbuf);
847 	return flush_imsg(ibuf);
848 }
849 
850 const struct got_error *
851 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
852     struct got_pathlist_head *have_refs,
853     struct got_pathlist_head *delete_refs,
854     int verbosity)
855 {
856 	const struct got_error *err = NULL;
857 	struct got_pathlist_entry *pe;
858 	struct got_imsg_send_request sendreq;
859 	struct got_object_id zero_id;
860 
861 	memset(&zero_id, 0, sizeof(zero_id));
862 	memset(&sendreq, 0, sizeof(sendreq));
863 	sendreq.verbosity = verbosity;
864 	TAILQ_FOREACH(pe, have_refs, entry)
865 		sendreq.nrefs++;
866 	TAILQ_FOREACH(pe, delete_refs, entry)
867 		sendreq.nrefs++;
868 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
869 	    &sendreq, sizeof(sendreq)) == -1) {
870 		err = got_error_from_errno(
871 		    "imsg_compose FETCH_SERVER_PROGRESS");
872 		goto done;
873 	}
874 
875 	err = flush_imsg(ibuf);
876 	if (err)
877 		goto done;
878 	fd = -1;
879 
880 	TAILQ_FOREACH(pe, have_refs, entry) {
881 		const char *name = pe->path;
882 		size_t name_len = pe->path_len;
883 		struct got_object_id *id = pe->data;
884 		err = send_send_ref(name, name_len, id, 0, ibuf);
885 		if (err)
886 			goto done;
887 	}
888 
889 	TAILQ_FOREACH(pe, delete_refs, entry) {
890 		const char *name = pe->path;
891 		size_t name_len = pe->path_len;
892 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
893 		if (err)
894 			goto done;
895 	}
896 done:
897 	if (fd != -1 && close(fd) == -1 && err == NULL)
898 		err = got_error_from_errno("close");
899 	return err;
900 
901 }
902 
903 const struct got_error *
904 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
905     struct imsgbuf *ibuf)
906 {
907 	const struct got_error *err = NULL;
908 	struct imsg imsg;
909 	size_t datalen;
910 	int done = 0;
911 	struct got_imsg_send_remote_ref iremote_ref;
912 	struct got_object_id *id = NULL;
913 	char *refname = NULL;
914 	struct got_pathlist_entry *new;
915 
916 	while (!done) {
917 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
918 		if (err)
919 			return err;
920 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
921 		switch (imsg.hdr.type) {
922 		case GOT_IMSG_SEND_REMOTE_REF:
923 			if (datalen < sizeof(iremote_ref)) {
924 				err = got_error(GOT_ERR_PRIVSEP_MSG);
925 				goto done;
926 			}
927 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
928 			if (datalen != sizeof(iremote_ref) +
929 			    iremote_ref.name_len) {
930 				err = got_error(GOT_ERR_PRIVSEP_MSG);
931 				goto done;
932 			}
933 			id = calloc(1, sizeof(*id));
934 			if (id == NULL) {
935 				err = got_error_from_errno("malloc");
936 				goto done;
937 			}
938 			memcpy(id, &iremote_ref.id, sizeof(*id));
939 			refname = strndup(imsg.data + sizeof(iremote_ref),
940 			    datalen - sizeof(iremote_ref));
941 			if (refname == NULL) {
942 				err = got_error_from_errno("strndup");
943 				goto done;
944 			}
945 			err = got_pathlist_insert(&new, remote_refs,
946 			    refname, id);
947 			if (err)
948 				goto done;
949 			if (new == NULL) { /* duplicate which wasn't inserted */
950 				free(id);
951 				free(refname);
952 			}
953 			id = NULL;
954 			refname = NULL;
955 			break;
956 		case GOT_IMSG_SEND_PACK_REQUEST:
957 			if (datalen != 0) {
958 				err = got_error(GOT_ERR_PRIVSEP_MSG);
959 				goto done;
960 			}
961 			/* got-send-pack is now waiting for a pack file. */
962 			done = 1;
963 			break;
964 		default:
965 			err = got_error(GOT_ERR_PRIVSEP_MSG);
966 			break;
967 		}
968 	}
969 done:
970 	free(id);
971 	free(refname);
972 	imsg_free(&imsg);
973 	return err;
974 }
975 
976 const struct got_error *
977 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
978 {
979 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
980 }
981 
982 const struct got_error *
983 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
984     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
985 {
986 	const struct got_error *err = NULL;
987 	struct imsg imsg;
988 	size_t datalen;
989 	struct got_imsg_send_ref_status iref_status;
990 
991 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
992 	*done = 0;
993 	*success = 0;
994 	*refname = NULL;
995 	*errmsg = NULL;
996 
997 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
998 	if (err)
999 		return err;
1000 
1001 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1002 	switch (imsg.hdr.type) {
1003 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1004 		if (datalen < sizeof(*bytes_sent)) {
1005 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1006 			break;
1007 		}
1008 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1009 		break;
1010 	case GOT_IMSG_SEND_REF_STATUS:
1011 		if (datalen < sizeof(iref_status)) {
1012 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1013 			break;
1014 		}
1015 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1016 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1017 		    iref_status.errmsg_len) {
1018 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1019 			break;
1020 		}
1021 		*success = iref_status.success;
1022 		*refname = strndup(imsg.data + sizeof(iref_status),
1023 		    iref_status.name_len);
1024 
1025 		if (iref_status.errmsg_len != 0)
1026 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1027 			    iref_status.name_len, iref_status.errmsg_len);
1028 		break;
1029 	case GOT_IMSG_SEND_DONE:
1030 		if (datalen != 0) {
1031 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1032 			break;
1033 		}
1034 		*done = 1;
1035 		break;
1036 	default:
1037 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1038 		break;
1039 	}
1040 
1041 	imsg_free(&imsg);
1042 	return err;
1043 }
1044 
1045 const struct got_error *
1046 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1047     int fd)
1048 {
1049 	const struct got_error *err = NULL;
1050 
1051 	/* Keep in sync with struct got_imsg_index_pack_request */
1052 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1053 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1054 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1055 		close(fd);
1056 		return err;
1057 	}
1058 	return flush_imsg(ibuf);
1059 }
1060 
1061 const struct got_error *
1062 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1063 {
1064 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1065 }
1066 
1067 const struct got_error *
1068 got_privsep_recv_index_progress(int *done, int *nobj_total,
1069     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1070     struct imsgbuf *ibuf)
1071 {
1072 	const struct got_error *err = NULL;
1073 	struct imsg imsg;
1074 	struct got_imsg_index_pack_progress *iprogress;
1075 	size_t datalen;
1076 
1077 	*done = 0;
1078 	*nobj_total = 0;
1079 	*nobj_indexed = 0;
1080 	*nobj_resolved = 0;
1081 
1082 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1083 	if (err)
1084 		return err;
1085 
1086 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1087 	switch (imsg.hdr.type) {
1088 	case GOT_IMSG_IDXPACK_PROGRESS:
1089 		if (datalen < sizeof(*iprogress)) {
1090 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1091 			break;
1092 		}
1093 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1094 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1095 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1096 			err = got_error(GOT_ERR_RANGE);
1097 			break;
1098 		}
1099 		*nobj_total = iprogress->nobj_total;
1100 		*nobj_indexed = iprogress->nobj_indexed;
1101 		*nobj_loose = iprogress->nobj_loose;
1102 		*nobj_resolved = iprogress->nobj_resolved;
1103 		break;
1104 	case GOT_IMSG_IDXPACK_DONE:
1105 		if (datalen != 0) {
1106 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1107 			break;
1108 		}
1109 		*done = 1;
1110 		break;
1111 	default:
1112 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1113 		break;
1114 	}
1115 
1116 	imsg_free(&imsg);
1117 	return err;
1118 }
1119 
1120 const struct got_error *
1121 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1122     struct imsgbuf *ibuf)
1123 {
1124 	struct got_imsg_object *iobj;
1125 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1126 
1127 	if (datalen != sizeof(*iobj))
1128 		return got_error(GOT_ERR_PRIVSEP_LEN);
1129 	iobj = imsg->data;
1130 
1131 	if (iobj->pack_offset < 0)
1132 		return got_error(GOT_ERR_PACK_OFFSET);
1133 
1134 	*obj = calloc(1, sizeof(**obj));
1135 	if (*obj == NULL)
1136 		return got_error_from_errno("calloc");
1137 
1138 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1139 	(*obj)->type = iobj->type;
1140 	(*obj)->flags = iobj->flags;
1141 	(*obj)->hdrlen = iobj->hdrlen;
1142 	(*obj)->size = iobj->size;
1143 	/* path_packfile is handled by caller */
1144 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1145 		(*obj)->pack_offset = iobj->pack_offset;
1146 		(*obj)->pack_idx = iobj->pack_idx;
1147 	}
1148 	STAILQ_INIT(&(*obj)->deltas.entries);
1149 	return NULL;
1150 }
1151 
1152 const struct got_error *
1153 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1154 {
1155 	const struct got_error *err = NULL;
1156 	struct imsg imsg;
1157 	const size_t min_datalen =
1158 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1159 
1160 	*obj = NULL;
1161 
1162 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1163 	if (err)
1164 		return err;
1165 
1166 	switch (imsg.hdr.type) {
1167 	case GOT_IMSG_OBJECT:
1168 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1169 		break;
1170 	default:
1171 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1172 		break;
1173 	}
1174 
1175 	imsg_free(&imsg);
1176 
1177 	return err;
1178 }
1179 
1180 static const struct got_error *
1181 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1182     size_t logmsg_len)
1183 {
1184 	const struct got_error *err = NULL;
1185 	size_t offset, remain;
1186 
1187 	offset = 0;
1188 	remain = logmsg_len;
1189 	while (remain > 0) {
1190 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1191 
1192 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1193 		    commit->logmsg + offset, n) == -1) {
1194 			err = got_error_from_errno("imsg_compose "
1195 			    "COMMIT_LOGMSG");
1196 			break;
1197 		}
1198 
1199 		err = flush_imsg(ibuf);
1200 		if (err)
1201 			break;
1202 
1203 		offset += n;
1204 		remain -= n;
1205 	}
1206 
1207 	return err;
1208 }
1209 
1210 const struct got_error *
1211 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1212 {
1213 	const struct got_error *err = NULL;
1214 	struct got_imsg_commit_object *icommit;
1215 	uint8_t *buf;
1216 	size_t len, total;
1217 	struct got_object_qid *qid;
1218 	size_t author_len = strlen(commit->author);
1219 	size_t committer_len = strlen(commit->committer);
1220 	size_t logmsg_len = strlen(commit->logmsg);
1221 
1222 	total = sizeof(*icommit) + author_len + committer_len +
1223 	    commit->nparents * sizeof(struct got_object_id);
1224 
1225 	buf = malloc(total);
1226 	if (buf == NULL)
1227 		return got_error_from_errno("malloc");
1228 
1229 	icommit = (struct got_imsg_commit_object *)buf;
1230 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1231 	icommit->author_len = author_len;
1232 	icommit->author_time = commit->author_time;
1233 	icommit->author_gmtoff = commit->author_gmtoff;
1234 	icommit->committer_len = committer_len;
1235 	icommit->committer_time = commit->committer_time;
1236 	icommit->committer_gmtoff = commit->committer_gmtoff;
1237 	icommit->logmsg_len = logmsg_len;
1238 	icommit->nparents = commit->nparents;
1239 
1240 	len = sizeof(*icommit);
1241 	memcpy(buf + len, commit->author, author_len);
1242 	len += author_len;
1243 	memcpy(buf + len, commit->committer, committer_len);
1244 	len += committer_len;
1245 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1246 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1247 		len += sizeof(qid->id);
1248 	}
1249 
1250 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1251 		err = got_error_from_errno("imsg_compose COMMIT");
1252 		goto done;
1253 	}
1254 
1255 	if (logmsg_len == 0 ||
1256 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1257 		err = flush_imsg(ibuf);
1258 		if (err)
1259 			goto done;
1260 	}
1261 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1262 done:
1263 	free(buf);
1264 	return err;
1265 }
1266 
1267 static const struct got_error *
1268 get_commit_from_imsg(struct got_commit_object **commit,
1269     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1270 {
1271 	const struct got_error *err = NULL;
1272 	struct got_imsg_commit_object *icommit;
1273 	size_t len = 0;
1274 	int i;
1275 
1276 	if (datalen < sizeof(*icommit))
1277 		return got_error(GOT_ERR_PRIVSEP_LEN);
1278 
1279 	icommit = imsg->data;
1280 	if (datalen != sizeof(*icommit) + icommit->author_len +
1281 	    icommit->committer_len +
1282 	    icommit->nparents * sizeof(struct got_object_id))
1283 		return got_error(GOT_ERR_PRIVSEP_LEN);
1284 
1285 	if (icommit->nparents < 0)
1286 		return got_error(GOT_ERR_PRIVSEP_LEN);
1287 
1288 	len += sizeof(*icommit);
1289 
1290 	*commit = got_object_commit_alloc_partial();
1291 	if (*commit == NULL)
1292 		return got_error_from_errno(
1293 		    "got_object_commit_alloc_partial");
1294 
1295 	memcpy((*commit)->tree_id, &icommit->tree_id,
1296 	    sizeof(icommit->tree_id));
1297 	(*commit)->author_time = icommit->author_time;
1298 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1299 	(*commit)->committer_time = icommit->committer_time;
1300 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1301 
1302 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1303 	if ((*commit)->author == NULL) {
1304 		err = got_error_from_errno("strndup");
1305 		goto done;
1306 	}
1307 	len += icommit->author_len;
1308 
1309 	(*commit)->committer = strndup(imsg->data + len,
1310 	    icommit->committer_len);
1311 	if ((*commit)->committer == NULL) {
1312 		err = got_error_from_errno("strndup");
1313 		goto done;
1314 	}
1315 	len += icommit->committer_len;
1316 
1317 	if (icommit->logmsg_len == 0) {
1318 		(*commit)->logmsg = strdup("");
1319 		if ((*commit)->logmsg == NULL) {
1320 			err = got_error_from_errno("strdup");
1321 			goto done;
1322 		}
1323 	} else {
1324 		size_t offset = 0, remain = icommit->logmsg_len;
1325 
1326 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1327 		if ((*commit)->logmsg == NULL) {
1328 			err = got_error_from_errno("malloc");
1329 			goto done;
1330 		}
1331 		while (remain > 0) {
1332 			struct imsg imsg_log;
1333 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1334 			    remain);
1335 
1336 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1337 			if (err)
1338 				goto done;
1339 
1340 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1341 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1342 				goto done;
1343 			}
1344 
1345 			memcpy((*commit)->logmsg + offset,
1346 			    imsg_log.data, n);
1347 			imsg_free(&imsg_log);
1348 			offset += n;
1349 			remain -= n;
1350 		}
1351 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1352 	}
1353 
1354 	for (i = 0; i < icommit->nparents; i++) {
1355 		struct got_object_qid *qid;
1356 
1357 		err = got_object_qid_alloc_partial(&qid);
1358 		if (err)
1359 			break;
1360 		memcpy(&qid->id, imsg->data + len +
1361 		    i * sizeof(qid->id), sizeof(qid->id));
1362 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1363 		(*commit)->nparents++;
1364 	}
1365 done:
1366 	if (err) {
1367 		got_object_commit_close(*commit);
1368 		*commit = NULL;
1369 	}
1370 	return err;
1371 }
1372 
1373 const struct got_error *
1374 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1375 {
1376 	const struct got_error *err = NULL;
1377 	struct imsg imsg;
1378 	size_t datalen;
1379 	const size_t min_datalen =
1380 	    MIN(sizeof(struct got_imsg_error),
1381 	    sizeof(struct got_imsg_commit_object));
1382 
1383 	*commit = NULL;
1384 
1385 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1386 	if (err)
1387 		return err;
1388 
1389 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1390 
1391 	switch (imsg.hdr.type) {
1392 	case GOT_IMSG_COMMIT:
1393 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1394 		break;
1395 	default:
1396 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1397 		break;
1398 	}
1399 
1400 	imsg_free(&imsg);
1401 
1402 	return err;
1403 }
1404 
1405 static const struct got_error *
1406 send_tree_entries_batch(struct imsgbuf *ibuf,
1407     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1408 {
1409 	struct ibuf *wbuf;
1410 	struct got_imsg_tree_entries ientries;
1411 	int i;
1412 
1413 	memset(&ientries, 0, sizeof(ientries));
1414 
1415 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1416 	if (wbuf == NULL)
1417 		return got_error_from_errno("imsg_create TREE_ENTRY");
1418 
1419 	ientries.nentries = idxN - idx0 + 1;
1420 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1421 		return got_error_from_errno("imsg_add TREE_ENTRY");
1422 
1423 	for (i = idx0; i <= idxN; i++) {
1424 		static const char gap[12]; /* for sha1 inside sha256 align. */
1425 		struct got_parsed_tree_entry *pte = &entries[i];
1426 
1427 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1428 		if (imsg_add(wbuf, pte->id, pte->idlen) == -1)
1429 			return got_error_from_errno("imsg_add TREE_ENTRY");
1430 		if (pte->idlen != SHA256_DIGEST_LENGTH &&
1431 		    imsg_add(wbuf, gap, sizeof(gap)) == -1)
1432 			return got_error_from_errno("imsg_add TREE_ENTRY");
1433 		if (imsg_add(wbuf, &pte->algo, sizeof(pte->algo)) == -1)
1434 			return got_error_from_errno("imsg_add TREE_ENTRY");
1435 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1436 			return got_error_from_errno("imsg_add TREE_ENTRY");
1437 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1438 			return got_error_from_errno("imsg_add TREE_ENTRY");
1439 
1440 		/* Remaining bytes are the entry's name. */
1441 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1442 			return got_error_from_errno("imsg_add TREE_ENTRY");
1443 	}
1444 
1445 	wbuf->fd = -1;
1446 	imsg_close(ibuf, wbuf);
1447 	return NULL;
1448 }
1449 
1450 static const struct got_error *
1451 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1452     int nentries)
1453 {
1454 	const struct got_error *err = NULL;
1455 	int i, j;
1456 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1457 
1458 	i = 0;
1459 	for (j = 0; j < nentries; j++) {
1460 		struct got_parsed_tree_entry *pte = &entries[j];
1461 		size_t len = sizeof(struct got_imsg_tree_entry)
1462 		    + pte->namelen;
1463 
1464 		if (j > 0 &&
1465 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1466 			err = send_tree_entries_batch(ibuf, entries,
1467 			    i, j - 1, entries_len);
1468 			if (err)
1469 				return err;
1470 			i = j;
1471 			entries_len = sizeof(struct got_imsg_tree_entries);
1472 		}
1473 
1474 		entries_len += len;
1475 	}
1476 
1477 	if (j > 0) {
1478 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1479 		    entries_len);
1480 		if (err)
1481 			return err;
1482 	}
1483 
1484 	return NULL;
1485 }
1486 
1487 const struct got_error *
1488 got_privsep_send_tree(struct imsgbuf *ibuf,
1489     struct got_parsed_tree_entry *entries, int nentries)
1490 {
1491 	const struct got_error *err = NULL;
1492 	struct got_imsg_tree_object itree;
1493 
1494 	memset(&itree, 0, sizeof(itree));
1495 	itree.nentries = nentries;
1496 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1497 	    == -1)
1498 		return got_error_from_errno("imsg_compose TREE");
1499 
1500 	err = send_tree_entries(ibuf, entries, nentries);
1501 	if (err)
1502 		return err;
1503 
1504 	return flush_imsg(ibuf);
1505 }
1506 
1507 
1508 static const struct got_error *
1509 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1510     int *nentries)
1511 {
1512 	const struct got_error *err = NULL;
1513 	struct got_imsg_tree_entries *ientries;
1514 	struct got_tree_entry *te;
1515 	size_t te_offset;
1516 	size_t i;
1517 
1518 	if (datalen <= sizeof(*ientries) ||
1519 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1520 		return got_error(GOT_ERR_PRIVSEP_LEN);
1521 
1522 	ientries = (struct got_imsg_tree_entries *)data;
1523 	if (ientries->nentries > INT_MAX) {
1524 		return got_error_msg(GOT_ERR_NO_SPACE,
1525 		    "too many tree entries");
1526 	}
1527 
1528 	te_offset = sizeof(*ientries);
1529 	for (i = 0; i < ientries->nentries; i++) {
1530 		struct got_imsg_tree_entry ite;
1531 		const char *te_name;
1532 		uint8_t *buf = (uint8_t *)data + te_offset;
1533 
1534 		if (te_offset >= datalen) {
1535 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1536 			break;
1537 		}
1538 
1539 		/* Might not be aligned, size is ~32 bytes. */
1540 		memcpy(&ite, buf, sizeof(ite));
1541 
1542 		if (ite.namelen >= sizeof(te->name)) {
1543 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1544 			break;
1545 		}
1546 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1547 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1548 			break;
1549 		}
1550 
1551 		if (*nentries >= tree->nentries) {
1552 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1553 			break;
1554 		}
1555 		te = &tree->entries[*nentries];
1556 		te_name = buf + sizeof(ite);
1557 		memcpy(te->name, te_name, ite.namelen);
1558 		te->name[ite.namelen] = '\0';
1559 		memcpy(te->id.hash, ite.id, got_hash_digest_length(ite.algo));
1560 		te->id.algo = ite.algo;
1561 		te->mode = ite.mode;
1562 		te->idx = *nentries;
1563 		(*nentries)++;
1564 
1565 		te_offset += sizeof(ite) + ite.namelen;
1566 	}
1567 
1568 	return err;
1569 }
1570 
1571 const struct got_error *
1572 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1573 {
1574 	const struct got_error *err = NULL;
1575 	const size_t min_datalen =
1576 	    MIN(sizeof(struct got_imsg_error),
1577 	    sizeof(struct got_imsg_tree_object));
1578 	struct got_imsg_tree_object *itree;
1579 	int nentries = 0;
1580 
1581 	*tree = NULL;
1582 
1583 	while (*tree == NULL || nentries < (*tree)->nentries) {
1584 		struct imsg imsg;
1585 		size_t datalen;
1586 
1587 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1588 		if (err)
1589 			break;
1590 
1591 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1592 
1593 		switch (imsg.hdr.type) {
1594 		case GOT_IMSG_TREE:
1595 			/* This message should only appear once. */
1596 			if (*tree != NULL) {
1597 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1598 				break;
1599 			}
1600 			if (datalen != sizeof(*itree)) {
1601 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1602 				break;
1603 			}
1604 			itree = imsg.data;
1605 			if (itree->nentries < 0) {
1606 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1607 				break;
1608 			}
1609 			*tree = malloc(sizeof(**tree));
1610 			if (*tree == NULL) {
1611 				err = got_error_from_errno("malloc");
1612 				break;
1613 			}
1614 			(*tree)->entries = calloc(itree->nentries,
1615 			    sizeof(struct got_tree_entry));
1616 			if ((*tree)->entries == NULL) {
1617 				err = got_error_from_errno("malloc");
1618 				free(*tree);
1619 				*tree = NULL;
1620 				break;
1621 			}
1622 			(*tree)->nentries = itree->nentries;
1623 			(*tree)->refcnt = 0;
1624 			break;
1625 		case GOT_IMSG_TREE_ENTRIES:
1626 			/* This message should be preceeded by GOT_IMSG_TREE. */
1627 			if (*tree == NULL) {
1628 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1629 				break;
1630 			}
1631 			err = recv_tree_entries(imsg.data, datalen,
1632 			    *tree, &nentries);
1633 			break;
1634 		default:
1635 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1636 			break;
1637 		}
1638 
1639 		imsg_free(&imsg);
1640 		if (err)
1641 			break;
1642 	}
1643 
1644 	if (*tree && (*tree)->nentries != nentries) {
1645 		if (err == NULL)
1646 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1647 		got_object_tree_close(*tree);
1648 		*tree = NULL;
1649 	}
1650 
1651 	return err;
1652 }
1653 
1654 const struct got_error *
1655 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1656     const uint8_t *data)
1657 {
1658 	struct got_imsg_blob iblob;
1659 
1660 	memset(&iblob, 0, sizeof(iblob));
1661 	iblob.size = size;
1662 	iblob.hdrlen = hdrlen;
1663 
1664 	if (data) {
1665 		uint8_t *buf;
1666 
1667 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1668 			return got_error(GOT_ERR_NO_SPACE);
1669 
1670 		buf = malloc(sizeof(iblob) + size);
1671 		if (buf == NULL)
1672 			return got_error_from_errno("malloc");
1673 
1674 		memcpy(buf, &iblob, sizeof(iblob));
1675 		memcpy(buf + sizeof(iblob), data, size);
1676 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1677 		    sizeof(iblob) + size) == -1) {
1678 			free(buf);
1679 			return got_error_from_errno("imsg_compose BLOB");
1680 		}
1681 		free(buf);
1682 	} else {
1683 		/* Data has already been written to file descriptor. */
1684 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1685 		    sizeof(iblob)) == -1)
1686 			return got_error_from_errno("imsg_compose BLOB");
1687 	}
1688 
1689 
1690 	return flush_imsg(ibuf);
1691 }
1692 
1693 const struct got_error *
1694 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1695     struct imsgbuf *ibuf)
1696 {
1697 	const struct got_error *err = NULL;
1698 	struct imsg imsg;
1699 	struct got_imsg_blob *iblob;
1700 	size_t datalen;
1701 
1702 	*outbuf = NULL;
1703 
1704 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1705 	if (err)
1706 		return err;
1707 
1708 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1709 
1710 	switch (imsg.hdr.type) {
1711 	case GOT_IMSG_BLOB:
1712 		if (datalen < sizeof(*iblob)) {
1713 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1714 			break;
1715 		}
1716 		iblob = imsg.data;
1717 		*size = iblob->size;
1718 		*hdrlen = iblob->hdrlen;
1719 
1720 		if (datalen == sizeof(*iblob)) {
1721 			/* Data has been written to file descriptor. */
1722 			break;
1723 		}
1724 
1725 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1726 		    *size > datalen + sizeof(*iblob)) {
1727 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1728 			break;
1729 		}
1730 
1731 		*outbuf = malloc(*size);
1732 		if (*outbuf == NULL) {
1733 			err = got_error_from_errno("malloc");
1734 			break;
1735 		}
1736 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1737 		break;
1738 	default:
1739 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1740 		break;
1741 	}
1742 
1743 	imsg_free(&imsg);
1744 
1745 	return err;
1746 }
1747 
1748 static const struct got_error *
1749 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1750 {
1751 	const struct got_error *err = NULL;
1752 	size_t offset, remain;
1753 
1754 	offset = 0;
1755 	remain = tagmsg_len;
1756 	while (remain > 0) {
1757 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1758 
1759 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1760 		    tag->tagmsg + offset, n) == -1) {
1761 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1762 			break;
1763 		}
1764 
1765 		err = flush_imsg(ibuf);
1766 		if (err)
1767 			break;
1768 
1769 		offset += n;
1770 		remain -= n;
1771 	}
1772 
1773 	return err;
1774 }
1775 
1776 const struct got_error *
1777 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1778 {
1779 	const struct got_error *err = NULL;
1780 	struct got_imsg_tag_object *itag;
1781 	uint8_t *buf;
1782 	size_t len, total;
1783 	size_t tag_len = strlen(tag->tag);
1784 	size_t tagger_len = strlen(tag->tagger);
1785 	size_t tagmsg_len = strlen(tag->tagmsg);
1786 
1787 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1788 
1789 	buf = malloc(total);
1790 	if (buf == NULL)
1791 		return got_error_from_errno("malloc");
1792 
1793 	itag = (struct got_imsg_tag_object *)buf;
1794 	memcpy(itag->id, tag->id.hash, sizeof(itag->id));
1795 	itag->obj_type = tag->obj_type;
1796 	itag->tag_len = tag_len;
1797 	itag->tagger_len = tagger_len;
1798 	itag->tagger_time = tag->tagger_time;
1799 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1800 	itag->tagmsg_len = tagmsg_len;
1801 
1802 	len = sizeof(*itag);
1803 	memcpy(buf + len, tag->tag, tag_len);
1804 	len += tag_len;
1805 	memcpy(buf + len, tag->tagger, tagger_len);
1806 	len += tagger_len;
1807 
1808 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1809 		err = got_error_from_errno("imsg_compose TAG");
1810 		goto done;
1811 	}
1812 
1813 	if (tagmsg_len == 0 ||
1814 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1815 		err = flush_imsg(ibuf);
1816 		if (err)
1817 			goto done;
1818 	}
1819 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1820 done:
1821 	free(buf);
1822 	return err;
1823 }
1824 
1825 const struct got_error *
1826 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1827 {
1828 	const struct got_error *err = NULL;
1829 	struct imsg imsg;
1830 	struct got_imsg_tag_object *itag;
1831 	size_t len, datalen;
1832 	const size_t min_datalen =
1833 	    MIN(sizeof(struct got_imsg_error),
1834 	    sizeof(struct got_imsg_tag_object));
1835 
1836 	*tag = NULL;
1837 
1838 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1839 	if (err)
1840 		return err;
1841 
1842 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1843 	len = 0;
1844 
1845 	switch (imsg.hdr.type) {
1846 	case GOT_IMSG_TAG:
1847 		if (datalen < sizeof(*itag)) {
1848 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1849 			break;
1850 		}
1851 		itag = imsg.data;
1852 		if (datalen != sizeof(*itag) + itag->tag_len +
1853 		    itag->tagger_len) {
1854 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1855 			break;
1856 		}
1857 		len += sizeof(*itag);
1858 
1859 		*tag = calloc(1, sizeof(**tag));
1860 		if (*tag == NULL) {
1861 			err = got_error_from_errno("calloc");
1862 			break;
1863 		}
1864 
1865 		memcpy((*tag)->id.hash, itag->id, SHA1_DIGEST_LENGTH);
1866 
1867 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1868 		if ((*tag)->tag == NULL) {
1869 			err = got_error_from_errno("strndup");
1870 			break;
1871 		}
1872 		len += itag->tag_len;
1873 
1874 		(*tag)->obj_type = itag->obj_type;
1875 		(*tag)->tagger_time = itag->tagger_time;
1876 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1877 
1878 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1879 		if ((*tag)->tagger == NULL) {
1880 			err = got_error_from_errno("strndup");
1881 			break;
1882 		}
1883 		len += itag->tagger_len;
1884 
1885 		if (itag->tagmsg_len == 0) {
1886 			(*tag)->tagmsg = strdup("");
1887 			if ((*tag)->tagmsg == NULL) {
1888 				err = got_error_from_errno("strdup");
1889 				break;
1890 			}
1891 		} else {
1892 			size_t offset = 0, remain = itag->tagmsg_len;
1893 
1894 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1895 			if ((*tag)->tagmsg == NULL) {
1896 				err = got_error_from_errno("malloc");
1897 				break;
1898 			}
1899 			while (remain > 0) {
1900 				struct imsg imsg_log;
1901 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1902 				    remain);
1903 
1904 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1905 				if (err)
1906 					return err;
1907 
1908 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1909 					return got_error(GOT_ERR_PRIVSEP_MSG);
1910 
1911 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1912 				    n);
1913 				imsg_free(&imsg_log);
1914 				offset += n;
1915 				remain -= n;
1916 			}
1917 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1918 		}
1919 
1920 		break;
1921 	default:
1922 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1923 		break;
1924 	}
1925 
1926 	imsg_free(&imsg);
1927 
1928 	return err;
1929 }
1930 
1931 const struct got_error *
1932 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1933     struct got_packidx *packidx)
1934 {
1935 	const struct got_error *err = NULL;
1936 	struct got_imsg_packidx ipackidx;
1937 	struct got_imsg_pack ipack;
1938 	int fd;
1939 
1940 	memset(&ipackidx, 0, sizeof(ipackidx));
1941 	memset(&ipack, 0, sizeof(ipack));
1942 
1943 	ipackidx.len = packidx->len;
1944 	ipackidx.packfile_size = pack->filesize;
1945 	ipackidx.algo = packidx->algo;
1946 	fd = dup(packidx->fd);
1947 	if (fd == -1)
1948 		return got_error_from_errno("dup");
1949 
1950 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1951 	    sizeof(ipackidx)) == -1) {
1952 		err = got_error_from_errno("imsg_compose PACKIDX");
1953 		close(fd);
1954 		return err;
1955 	}
1956 
1957 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1958 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1959 		return got_error(GOT_ERR_NO_SPACE);
1960 	ipack.filesize = pack->filesize;
1961 	ipack.algo = pack->algo;
1962 
1963 	fd = dup(pack->fd);
1964 	if (fd == -1)
1965 		return got_error_from_errno("dup");
1966 
1967 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1968 	    == -1) {
1969 		err = got_error_from_errno("imsg_compose PACK");
1970 		close(fd);
1971 		return err;
1972 	}
1973 
1974 	return flush_imsg(ibuf);
1975 }
1976 
1977 const struct got_error *
1978 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1979     struct got_object_id *id)
1980 {
1981 	struct got_imsg_packed_object iobj;
1982 
1983 	memset(&iobj, 0, sizeof(iobj));
1984 	iobj.idx = idx;
1985 	memcpy(&iobj.id, id, sizeof(iobj.id));
1986 
1987 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1988 	    &iobj, sizeof(iobj)) == -1)
1989 		return got_error_from_errno("imsg_compose "
1990 		    "PACKED_OBJECT_REQUEST");
1991 
1992 	return flush_imsg(ibuf);
1993 }
1994 
1995 const struct got_error *
1996 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1997     struct got_object_id *id)
1998 {
1999 	struct got_imsg_packed_object iobj;
2000 
2001 	memset(&iobj, 0, sizeof(iobj));
2002 	iobj.idx = idx;
2003 	memcpy(&iobj.id, id, sizeof(iobj.id));
2004 
2005 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2006 	    &iobj, sizeof(iobj)) == -1)
2007 		return got_error_from_errno("imsg_compose "
2008 		    "PACKED_OBJECT_REQUEST");
2009 
2010 	return flush_imsg(ibuf);
2011 }
2012 
2013 const struct got_error *
2014 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2015 {
2016 	const struct got_error *err = NULL;
2017 
2018 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2019 	    NULL, 0) == -1) {
2020 		err = got_error_from_errno("imsg_compose "
2021 		    "GITCONFIG_PARSE_REQUEST");
2022 		close(fd);
2023 		return err;
2024 	}
2025 
2026 	return flush_imsg(ibuf);
2027 }
2028 
2029 const struct got_error *
2030 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2031 {
2032 	if (imsg_compose(ibuf,
2033 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2034 	    NULL, 0) == -1)
2035 		return got_error_from_errno("imsg_compose "
2036 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2037 
2038 	return flush_imsg(ibuf);
2039 }
2040 
2041 const struct got_error *
2042 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2043 {
2044 	if (imsg_compose(ibuf,
2045 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2046 	    NULL, 0) == -1)
2047 		return got_error_from_errno("imsg_compose "
2048 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2049 
2050 	return flush_imsg(ibuf);
2051 }
2052 
2053 
2054 const struct got_error *
2055 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2056 {
2057 	if (imsg_compose(ibuf,
2058 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2059 		return got_error_from_errno("imsg_compose "
2060 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2061 
2062 	return flush_imsg(ibuf);
2063 }
2064 
2065 const struct got_error *
2066 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2067 {
2068 	if (imsg_compose(ibuf,
2069 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2070 		return got_error_from_errno("imsg_compose "
2071 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2072 
2073 	return flush_imsg(ibuf);
2074 }
2075 
2076 const struct got_error *
2077 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2078 {
2079 	if (imsg_compose(ibuf,
2080 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2081 		return got_error_from_errno("imsg_compose "
2082 		    "GITCONFIG_REMOTE_REQUEST");
2083 
2084 	return flush_imsg(ibuf);
2085 }
2086 
2087 const struct got_error *
2088 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2089 {
2090 	if (imsg_compose(ibuf,
2091 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2092 		return got_error_from_errno("imsg_compose "
2093 		    "GITCONFIG_OWNER_REQUEST");
2094 
2095 	return flush_imsg(ibuf);
2096 }
2097 
2098 const struct got_error *
2099 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2100 {
2101 	const struct got_error *err = NULL;
2102 	struct imsg imsg;
2103 	size_t datalen;
2104 
2105 	*str = NULL;
2106 
2107 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2108 	if (err)
2109 		return err;
2110 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2111 
2112 	switch (imsg.hdr.type) {
2113 	case GOT_IMSG_GITCONFIG_STR_VAL:
2114 		if (datalen == 0)
2115 			break;
2116 		*str = strndup(imsg.data, datalen);
2117 		if (*str == NULL) {
2118 			err = got_error_from_errno("strndup");
2119 			break;
2120 		}
2121 		break;
2122 	default:
2123 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2124 		break;
2125 	}
2126 
2127 	imsg_free(&imsg);
2128 	return err;
2129 }
2130 
2131 const struct got_error *
2132 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2133 {
2134 	const struct got_error *err = NULL;
2135 	struct got_imsg_gitconfig_pair p;
2136 	struct imsg imsg;
2137 	size_t datalen;
2138 	uint8_t *data;
2139 
2140 	*key = *val = NULL;
2141 
2142 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2143 	if (err)
2144 		return err;
2145 
2146 	data = imsg.data;
2147 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2148 
2149 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2150 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2151 		goto done;
2152 	}
2153 
2154 	if (datalen < sizeof(p)) {
2155 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2156 		goto done;
2157 	}
2158 
2159 	memcpy(&p, data, sizeof(p));
2160 	data += sizeof(p);
2161 
2162 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2163 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2164 		goto done;
2165 	}
2166 
2167 	*key = strndup(data, p.klen);
2168 	if (*key == NULL) {
2169 		err = got_error_from_errno("strndup");
2170 		goto done;
2171 	}
2172 	data += p.klen;
2173 
2174 	*val = strndup(data, p.vlen);
2175 	if (*val == NULL) {
2176 		err = got_error_from_errno("strndup");
2177 		goto done;
2178 	}
2179 
2180 done:
2181 	imsg_free(&imsg);
2182 	return err;
2183 }
2184 
2185 const struct got_error *
2186 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2187 {
2188 	const struct got_error *err = NULL;
2189 	struct imsg imsg;
2190 	size_t datalen;
2191 	const size_t min_datalen =
2192 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2193 
2194 	*val = 0;
2195 
2196 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2197 	if (err)
2198 		return err;
2199 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2200 
2201 	switch (imsg.hdr.type) {
2202 	case GOT_IMSG_GITCONFIG_INT_VAL:
2203 		if (datalen != sizeof(*val)) {
2204 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2205 			break;
2206 		}
2207 		memcpy(val, imsg.data, sizeof(*val));
2208 		break;
2209 	default:
2210 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2211 		break;
2212 	}
2213 
2214 	imsg_free(&imsg);
2215 	return err;
2216 }
2217 
2218 static void
2219 free_remote_data(struct got_remote_repo *remote)
2220 {
2221 	int i;
2222 
2223 	free(remote->name);
2224 	free(remote->fetch_url);
2225 	free(remote->send_url);
2226 	for (i = 0; i < remote->nfetch_branches; i++)
2227 		free(remote->fetch_branches[i]);
2228 	free(remote->fetch_branches);
2229 	for (i = 0; i < remote->nsend_branches; i++)
2230 		free(remote->send_branches[i]);
2231 	free(remote->send_branches);
2232 	for (i = 0; i < remote->nfetch_refs; i++)
2233 		free(remote->fetch_refs[i]);
2234 	free(remote->fetch_refs);
2235 }
2236 
2237 const struct got_error *
2238 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2239     int *nremotes, struct imsgbuf *ibuf)
2240 {
2241 	const struct got_error *err = NULL;
2242 	struct imsg imsg;
2243 	size_t datalen;
2244 	struct got_imsg_remotes iremotes;
2245 	struct got_imsg_remote iremote;
2246 
2247 	*remotes = NULL;
2248 	*nremotes = 0;
2249 	iremotes.nremotes = 0;
2250 
2251 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2252 	if (err)
2253 		return err;
2254 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2255 
2256 	switch (imsg.hdr.type) {
2257 	case GOT_IMSG_GITCONFIG_REMOTES:
2258 		if (datalen != sizeof(iremotes)) {
2259 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2260 			break;
2261 		}
2262 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2263 		if (iremotes.nremotes == 0) {
2264 			imsg_free(&imsg);
2265 			return NULL;
2266 		}
2267 		break;
2268 	default:
2269 		imsg_free(&imsg);
2270 		return got_error(GOT_ERR_PRIVSEP_MSG);
2271 	}
2272 
2273 	imsg_free(&imsg);
2274 
2275 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2276 	if (*remotes == NULL)
2277 		return got_error_from_errno("recallocarray");
2278 
2279 	while (*nremotes < iremotes.nremotes) {
2280 		struct got_remote_repo *remote;
2281 
2282 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2283 		if (err)
2284 			break;
2285 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2286 
2287 		switch (imsg.hdr.type) {
2288 		case GOT_IMSG_GITCONFIG_REMOTE:
2289 			remote = &(*remotes)[*nremotes];
2290 			memset(remote, 0, sizeof(*remote));
2291 			if (datalen < sizeof(iremote)) {
2292 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2293 				break;
2294 			}
2295 			memcpy(&iremote, imsg.data, sizeof(iremote));
2296 			if (iremote.name_len == 0 ||
2297 			    iremote.fetch_url_len == 0 ||
2298 			    iremote.send_url_len == 0 ||
2299 			    (sizeof(iremote) + iremote.name_len +
2300 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2301 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2302 				break;
2303 			}
2304 			remote->name = strndup(imsg.data + sizeof(iremote),
2305 			    iremote.name_len);
2306 			if (remote->name == NULL) {
2307 				err = got_error_from_errno("strndup");
2308 				break;
2309 			}
2310 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2311 			    iremote.name_len, iremote.fetch_url_len);
2312 			if (remote->fetch_url == NULL) {
2313 				err = got_error_from_errno("strndup");
2314 				free_remote_data(remote);
2315 				break;
2316 			}
2317 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2318 			    iremote.name_len + iremote.fetch_url_len,
2319 			    iremote.send_url_len);
2320 			if (remote->send_url == NULL) {
2321 				err = got_error_from_errno("strndup");
2322 				free_remote_data(remote);
2323 				break;
2324 			}
2325 			remote->mirror_references = iremote.mirror_references;
2326 			remote->fetch_all_branches = iremote.fetch_all_branches;
2327 			remote->nfetch_branches = 0;
2328 			remote->fetch_branches = NULL;
2329 			remote->nsend_branches = 0;
2330 			remote->send_branches = NULL;
2331 			remote->nfetch_refs = 0;
2332 			remote->fetch_refs = NULL;
2333 			(*nremotes)++;
2334 			break;
2335 		default:
2336 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2337 			break;
2338 		}
2339 
2340 		imsg_free(&imsg);
2341 		if (err)
2342 			break;
2343 	}
2344 
2345 	if (err) {
2346 		int i;
2347 		for (i = 0; i < *nremotes; i++)
2348 			free_remote_data(&(*remotes)[i]);
2349 		free(*remotes);
2350 		*remotes = NULL;
2351 		*nremotes = 0;
2352 	}
2353 	return err;
2354 }
2355 
2356 const struct got_error *
2357 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2358 {
2359 	const struct got_error *err = NULL;
2360 
2361 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2362 	    NULL, 0) == -1) {
2363 		err = got_error_from_errno("imsg_compose "
2364 		    "GOTCONFIG_PARSE_REQUEST");
2365 		close(fd);
2366 		return err;
2367 	}
2368 
2369 	return flush_imsg(ibuf);
2370 }
2371 
2372 const struct got_error *
2373 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2374 {
2375 	if (imsg_compose(ibuf,
2376 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2377 		return got_error_from_errno("imsg_compose "
2378 		    "GOTCONFIG_AUTHOR_REQUEST");
2379 
2380 	return flush_imsg(ibuf);
2381 }
2382 
2383 const struct got_error *
2384 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2385 {
2386 	if (imsg_compose(ibuf,
2387 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2388 		return got_error_from_errno("imsg_compose "
2389 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2390 
2391 	return flush_imsg(ibuf);
2392 }
2393 
2394 const struct got_error *
2395 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2396 {
2397 	if (imsg_compose(ibuf,
2398 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2399 		return got_error_from_errno("imsg_compose "
2400 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2401 
2402 	return flush_imsg(ibuf);
2403 }
2404 
2405 const struct got_error *
2406 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2407 {
2408 	if (imsg_compose(ibuf,
2409 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2410 		return got_error_from_errno("imsg_compose "
2411 		    "GOTCONFIG_SIGNERID_REQUEST");
2412 
2413 	return flush_imsg(ibuf);
2414 }
2415 
2416 const struct got_error *
2417 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2418 {
2419 	if (imsg_compose(ibuf,
2420 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2421 		return got_error_from_errno("imsg_compose "
2422 		    "GOTCONFIG_REMOTE_REQUEST");
2423 
2424 	return flush_imsg(ibuf);
2425 }
2426 
2427 const struct got_error *
2428 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2429 {
2430 	const struct got_error *err = NULL;
2431 	struct imsg imsg;
2432 	size_t datalen;
2433 
2434 	*str = NULL;
2435 
2436 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2437 	if (err)
2438 		return err;
2439 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2440 
2441 	switch (imsg.hdr.type) {
2442 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2443 		if (datalen == 0)
2444 			break;
2445 		*str = strndup(imsg.data, datalen);
2446 		if (*str == NULL) {
2447 			err = got_error_from_errno("strndup");
2448 			break;
2449 		}
2450 		break;
2451 	default:
2452 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2453 		break;
2454 	}
2455 
2456 	imsg_free(&imsg);
2457 	return err;
2458 }
2459 
2460 const struct got_error *
2461 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2462     int *nremotes, struct imsgbuf *ibuf)
2463 {
2464 	const struct got_error *err = NULL;
2465 	struct imsg imsg;
2466 	size_t datalen;
2467 	struct got_imsg_remotes iremotes;
2468 	struct got_imsg_remote iremote;
2469 	const size_t min_datalen =
2470 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2471 
2472 	*remotes = NULL;
2473 	*nremotes = 0;
2474 	iremotes.nremotes = 0;
2475 
2476 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2477 	if (err)
2478 		return err;
2479 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2480 
2481 	switch (imsg.hdr.type) {
2482 	case GOT_IMSG_GOTCONFIG_REMOTES:
2483 		if (datalen != sizeof(iremotes)) {
2484 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2485 			break;
2486 		}
2487 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2488 		if (iremotes.nremotes < 0) {
2489 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2490 			break;
2491 		}
2492 		if (iremotes.nremotes == 0) {
2493 			imsg_free(&imsg);
2494 			return NULL;
2495 		}
2496 		break;
2497 	default:
2498 		imsg_free(&imsg);
2499 		return got_error(GOT_ERR_PRIVSEP_MSG);
2500 	}
2501 
2502 	imsg_free(&imsg);
2503 
2504 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2505 	if (*remotes == NULL)
2506 		return got_error_from_errno("recallocarray");
2507 
2508 	while (*nremotes < iremotes.nremotes) {
2509 		struct got_remote_repo *remote;
2510 		const size_t min_datalen =
2511 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2512 		int i;
2513 
2514 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2515 		if (err)
2516 			break;
2517 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2518 
2519 		switch (imsg.hdr.type) {
2520 		case GOT_IMSG_GOTCONFIG_REMOTE:
2521 			remote = &(*remotes)[*nremotes];
2522 			memset(remote, 0, sizeof(*remote));
2523 			if (datalen < sizeof(iremote)) {
2524 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2525 				break;
2526 			}
2527 			memcpy(&iremote, imsg.data, sizeof(iremote));
2528 			if (iremote.name_len == 0 ||
2529 			    (iremote.fetch_url_len == 0 &&
2530 			    iremote.send_url_len == 0) ||
2531 			    (sizeof(iremote) + iremote.name_len +
2532 			    iremote.fetch_url_len + iremote.send_url_len) >
2533 			    datalen) {
2534 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2535 				break;
2536 			}
2537 			remote->name = strndup(imsg.data + sizeof(iremote),
2538 			    iremote.name_len);
2539 			if (remote->name == NULL) {
2540 				err = got_error_from_errno("strndup");
2541 				break;
2542 			}
2543 			remote->fetch_url = strndup(imsg.data +
2544 			    sizeof(iremote) + iremote.name_len,
2545 			    iremote.fetch_url_len);
2546 			if (remote->fetch_url == NULL) {
2547 				err = got_error_from_errno("strndup");
2548 				free_remote_data(remote);
2549 				break;
2550 			}
2551 			remote->send_url = strndup(imsg.data +
2552 			    sizeof(iremote) + iremote.name_len +
2553 			    iremote.fetch_url_len, iremote.send_url_len);
2554 			if (remote->send_url == NULL) {
2555 				err = got_error_from_errno("strndup");
2556 				free_remote_data(remote);
2557 				break;
2558 			}
2559 			remote->mirror_references = iremote.mirror_references;
2560 			remote->fetch_all_branches = iremote.fetch_all_branches;
2561 			if (iremote.nfetch_branches > 0) {
2562 				remote->fetch_branches = recallocarray(NULL, 0,
2563 				    iremote.nfetch_branches, sizeof(char *));
2564 				if (remote->fetch_branches == NULL) {
2565 					err = got_error_from_errno("calloc");
2566 					free_remote_data(remote);
2567 					break;
2568 				}
2569 			}
2570 			remote->nfetch_branches = 0;
2571 			for (i = 0; i < iremote.nfetch_branches; i++) {
2572 				char *branch;
2573 				err = got_privsep_recv_gotconfig_str(&branch,
2574 				    ibuf);
2575 				if (err) {
2576 					free_remote_data(remote);
2577 					goto done;
2578 				}
2579 				remote->fetch_branches[i] = branch;
2580 				remote->nfetch_branches++;
2581 			}
2582 			if (iremote.nsend_branches > 0) {
2583 				remote->send_branches = recallocarray(NULL, 0,
2584 				    iremote.nsend_branches, sizeof(char *));
2585 				if (remote->send_branches == NULL) {
2586 					err = got_error_from_errno("calloc");
2587 					free_remote_data(remote);
2588 					break;
2589 				}
2590 			}
2591 			remote->nsend_branches = 0;
2592 			for (i = 0; i < iremote.nsend_branches; i++) {
2593 				char *branch;
2594 				err = got_privsep_recv_gotconfig_str(&branch,
2595 				    ibuf);
2596 				if (err) {
2597 					free_remote_data(remote);
2598 					goto done;
2599 				}
2600 				remote->send_branches[i] = branch;
2601 				remote->nsend_branches++;
2602 			}
2603 			if (iremote.nfetch_refs > 0) {
2604 				remote->fetch_refs = recallocarray(NULL, 0,
2605 				    iremote.nfetch_refs, sizeof(char *));
2606 				if (remote->fetch_refs == NULL) {
2607 					err = got_error_from_errno("calloc");
2608 					free_remote_data(remote);
2609 					break;
2610 				}
2611 			}
2612 			remote->nfetch_refs = 0;
2613 			for (i = 0; i < iremote.nfetch_refs; i++) {
2614 				char *ref;
2615 				err = got_privsep_recv_gotconfig_str(&ref,
2616 				    ibuf);
2617 				if (err) {
2618 					free_remote_data(remote);
2619 					goto done;
2620 				}
2621 				remote->fetch_refs[i] = ref;
2622 				remote->nfetch_refs++;
2623 			}
2624 			(*nremotes)++;
2625 			break;
2626 		default:
2627 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2628 			break;
2629 		}
2630 
2631 		imsg_free(&imsg);
2632 		if (err)
2633 			break;
2634 	}
2635 done:
2636 	if (err) {
2637 		int i;
2638 		for (i = 0; i < *nremotes; i++)
2639 			free_remote_data(&(*remotes)[i]);
2640 		free(*remotes);
2641 		*remotes = NULL;
2642 		*nremotes = 0;
2643 	}
2644 	return err;
2645 }
2646 
2647 const struct got_error *
2648 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2649     struct got_object_id *id, int idx, const char *path)
2650 {
2651 	struct ibuf *wbuf;
2652 	size_t path_len = strlen(path) + 1;
2653 
2654 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2655 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2656 	if (wbuf == NULL)
2657 		return got_error_from_errno(
2658 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2659 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
2660 		return got_error_from_errno("imsg_add "
2661 		    "COMMIT_TRAVERSAL_REQUEST");
2662 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2663 		return got_error_from_errno("imsg_add "
2664 		    "COMMIT_TRAVERSAL_REQUEST");
2665 	if (imsg_add(wbuf, path, path_len) == -1)
2666 		return got_error_from_errno("imsg_add "
2667 		    "COMMIT_TRAVERSAL_REQUEST");
2668 
2669 	wbuf->fd = -1;
2670 	imsg_close(ibuf, wbuf);
2671 
2672 	return flush_imsg(ibuf);
2673 }
2674 
2675 const struct got_error *
2676 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2677     struct got_object_id **changed_commit_id,
2678     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2679 {
2680 	const struct got_error *err = NULL;
2681 	struct imsg imsg;
2682 	struct got_imsg_traversed_commits *icommits;
2683 	size_t datalen;
2684 	int i, done = 0;
2685 
2686 	*changed_commit = NULL;
2687 	*changed_commit_id = NULL;
2688 
2689 	while (!done) {
2690 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2691 		if (err)
2692 			return err;
2693 
2694 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2695 		switch (imsg.hdr.type) {
2696 		case GOT_IMSG_TRAVERSED_COMMITS:
2697 			icommits = imsg.data;
2698 			if (datalen != sizeof(*icommits) +
2699 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2700 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2701 				break;
2702 			}
2703 			for (i = 0; i < icommits->ncommits; i++) {
2704 				struct got_object_qid *qid;
2705 				uint8_t *sha1 = (uint8_t *)imsg.data +
2706 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2707 				err = got_object_qid_alloc_partial(&qid);
2708 				if (err)
2709 					break;
2710 				memcpy(qid->id.hash, sha1, SHA1_DIGEST_LENGTH);
2711 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2712 
2713 				/* The last commit may contain a change. */
2714 				if (i == icommits->ncommits - 1) {
2715 					*changed_commit_id =
2716 					    got_object_id_dup(&qid->id);
2717 					if (*changed_commit_id == NULL) {
2718 						err = got_error_from_errno(
2719 						    "got_object_id_dup");
2720 						break;
2721 					}
2722 				}
2723 			}
2724 			break;
2725 		case GOT_IMSG_COMMIT:
2726 			if (*changed_commit_id == NULL) {
2727 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2728 				break;
2729 			}
2730 			err = get_commit_from_imsg(changed_commit, &imsg,
2731 			    datalen, ibuf);
2732 			break;
2733 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2734 			done = 1;
2735 			break;
2736 		default:
2737 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2738 			break;
2739 		}
2740 
2741 		imsg_free(&imsg);
2742 		if (err)
2743 			break;
2744 	}
2745 
2746 	if (err)
2747 		got_object_id_queue_free(commit_ids);
2748 	return err;
2749 }
2750 
2751 const struct got_error *
2752 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2753     struct got_object_id *tree_id, const char *path,
2754     struct got_parsed_tree_entry *entries, int nentries)
2755 {
2756 	const struct got_error *err = NULL;
2757 	struct ibuf *wbuf;
2758 	size_t path_len = strlen(path);
2759 	size_t msglen;
2760 
2761 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2762 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2763 	if (wbuf == NULL)
2764 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2765 
2766 	if (imsg_add(wbuf, tree_id->hash, SHA1_DIGEST_LENGTH) == -1)
2767 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2768 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2769 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2770 	if (imsg_add(wbuf, path, path_len) == -1)
2771 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2772 
2773 	wbuf->fd = -1;
2774 	imsg_close(ibuf, wbuf);
2775 
2776 	if (entries) {
2777 		err = send_tree_entries(ibuf, entries, nentries);
2778 		if (err)
2779 			return err;
2780 	}
2781 
2782 	return flush_imsg(ibuf);
2783 }
2784 
2785 const struct got_error *
2786 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2787 {
2788 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2789 	    0, 0, -1, NULL, 0) == -1)
2790 		return got_error_from_errno("imsg_compose "
2791 		    "OBJECT_ENUMERATION_REQUEST");
2792 
2793 	return flush_imsg(ibuf);
2794 }
2795 
2796 const struct got_error *
2797 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2798 {
2799 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2800 	    0, 0, -1, NULL, 0) == -1)
2801 		return got_error_from_errno("imsg_compose "
2802 		    "OBJECT_ENUMERATION_DONE");
2803 
2804 	return flush_imsg(ibuf);
2805 }
2806 
2807 const struct got_error *
2808 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2809 {
2810 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2811 	    0, 0, -1, NULL, 0) == -1)
2812 		return got_error_from_errno("imsg_compose "
2813 		    "OBJECT_ENUMERATION_INCOMPLETE");
2814 
2815 	return flush_imsg(ibuf);
2816 }
2817 
2818 const struct got_error *
2819 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2820     struct got_object_id *id, time_t mtime)
2821 {
2822 	struct ibuf *wbuf;
2823 
2824 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2825 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2826 	if (wbuf == NULL)
2827 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2828 
2829 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2830 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2831 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2832 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2833 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2834 
2835 	wbuf->fd = -1;
2836 	imsg_close(ibuf, wbuf);
2837 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2838 	return NULL;
2839 }
2840 
2841 const struct got_error *
2842 got_privsep_recv_enumerated_objects(int *found_all_objects,
2843     struct imsgbuf *ibuf,
2844     got_object_enumerate_commit_cb cb_commit,
2845     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2846     struct got_repository *repo)
2847 {
2848 	const struct got_error *err = NULL;
2849 	struct imsg imsg;
2850 	struct got_imsg_enumerated_commit *icommit = NULL;
2851 	struct got_object_id commit_id;
2852 	int have_commit = 0;
2853 	time_t mtime = 0;
2854 	struct got_tree_object tree;
2855 	struct got_imsg_enumerated_tree *itree;
2856 	struct got_object_id tree_id;
2857 	char *path = NULL, *canon_path = NULL;
2858 	size_t datalen, path_len;
2859 	int nentries = -1;
2860 	int done = 0;
2861 
2862 	*found_all_objects = 0;
2863 	memset(&tree, 0, sizeof(tree));
2864 
2865 	while (!done) {
2866 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2867 		if (err)
2868 			break;
2869 
2870 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2871 		switch (imsg.hdr.type) {
2872 		case GOT_IMSG_ENUMERATED_COMMIT:
2873 			if (have_commit && nentries != -1) {
2874 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2875 				break;
2876 			}
2877 			if (datalen != sizeof(*icommit)) {
2878 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2879 				break;
2880 			}
2881 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2882 			memset(&commit_id, 0, sizeof(commit_id));
2883 			memcpy(commit_id.hash, icommit->id, SHA1_DIGEST_LENGTH);
2884 			mtime = icommit->mtime;
2885 			have_commit = 1;
2886 			break;
2887 		case GOT_IMSG_ENUMERATED_TREE:
2888 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2889 			if (!have_commit) {
2890 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2891 				break;
2892 			}
2893 			if (datalen < sizeof(*itree)) {
2894 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2895 				break;
2896 			}
2897 			itree = imsg.data;
2898 			path_len = datalen - sizeof(*itree);
2899 			if (path_len == 0) {
2900 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2901 				break;
2902 			}
2903 			memset(&tree_id, 0, sizeof(tree_id));
2904 			memcpy(tree_id.hash, itree->id, SHA1_DIGEST_LENGTH);
2905 			free(path);
2906 			path = strndup(imsg.data + sizeof(*itree), path_len);
2907 			if (path == NULL) {
2908 				err = got_error_from_errno("strndup");
2909 				break;
2910 			}
2911 			free(canon_path);
2912 			canon_path = malloc(path_len + 1);
2913 			if (canon_path == NULL) {
2914 				err = got_error_from_errno("malloc");
2915 				break;
2916 			}
2917 			if (!got_path_is_absolute(path)) {
2918 				err = got_error(GOT_ERR_BAD_PATH);
2919 				break;
2920 			}
2921 			if (got_path_is_root_dir(path)) {
2922 				/* XXX check what got_canonpath() does wrong */
2923 				canon_path[0] = '/';
2924 				canon_path[1] = '\0';
2925 			} else {
2926 				err = got_canonpath(path, canon_path,
2927 				    path_len + 1);
2928 				if (err)
2929 					break;
2930 			}
2931 			if (strcmp(path, canon_path) != 0) {
2932 				err = got_error(GOT_ERR_BAD_PATH);
2933 				break;
2934 			}
2935 			if (nentries != -1) {
2936 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2937 				break;
2938 			}
2939 			if (itree->nentries < -1) {
2940 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2941 				break;
2942 			}
2943 			if (itree->nentries == -1) {
2944 				/* Tree was not found in pack file. */
2945 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2946 				    path, repo);
2947 				break;
2948 			}
2949 			if (itree->nentries > INT_MAX) {
2950 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2951 				break;
2952 			}
2953 			tree.entries = calloc(itree->nentries,
2954 			    sizeof(struct got_tree_entry));
2955 			if (tree.entries == NULL) {
2956 				err = got_error_from_errno("calloc");
2957 				break;
2958 			}
2959 			if (itree->nentries == 0) {
2960 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2961 				    path, repo);
2962 				if (err)
2963 					break;
2964 
2965 				/* Prepare for next tree. */
2966 				free(tree.entries);
2967 				memset(&tree, 0, sizeof(tree));
2968 				nentries = -1;
2969 			} else {
2970 				tree.nentries = itree->nentries;
2971 				nentries = 0;
2972 			}
2973 			break;
2974 		case GOT_IMSG_TREE_ENTRIES:
2975 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2976 			if (nentries <= -1) {
2977 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2978 				break;
2979 			}
2980 			err = recv_tree_entries(imsg.data, datalen,
2981 			    &tree, &nentries);
2982 			if (err)
2983 				break;
2984 			if (tree.nentries == nentries) {
2985 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2986 				    path, repo);
2987 				if (err)
2988 					break;
2989 
2990 				/* Prepare for next tree. */
2991 				free(tree.entries);
2992 				memset(&tree, 0, sizeof(tree));
2993 				nentries = -1;
2994 			}
2995 			break;
2996 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2997 			/* All trees have been found and traversed. */
2998 			if (!have_commit || path == NULL || nentries != -1) {
2999 				err = got_error(GOT_ERR_PRIVSEP_MSG);
3000 				break;
3001 			}
3002 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
3003 			if (err)
3004 				break;
3005 			have_commit = 0;
3006 			break;
3007 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
3008 			*found_all_objects = 1;
3009 			done = 1;
3010 			break;
3011 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
3012 			done = 1;
3013 			break;
3014 		default:
3015 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3016 			break;
3017 		}
3018 
3019 		imsg_free(&imsg);
3020 		if (err)
3021 			break;
3022 	}
3023 
3024 	free(path);
3025 	free(canon_path);
3026 	free(tree.entries);
3027 	return err;
3028 }
3029 
3030 const struct got_error *
3031 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3032     struct got_object_id *id)
3033 {
3034 	struct got_imsg_raw_delta_request dreq;
3035 
3036 	memset(&dreq, 0, sizeof(dreq));
3037 	dreq.idx = idx;
3038 	memcpy(&dreq.id, id, sizeof(dreq.id));
3039 
3040 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3041 	    &dreq, sizeof(dreq)) == -1)
3042 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3043 
3044 	return flush_imsg(ibuf);
3045 }
3046 
3047 const struct got_error *
3048 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3049 {
3050 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3051 }
3052 
3053 const struct got_error *
3054 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3055     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3056     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3057 {
3058 	struct got_imsg_raw_delta idelta;
3059 	int ret;
3060 
3061 	memset(&idelta, 0, sizeof(idelta));
3062 	idelta.base_size = base_size;
3063 	idelta.result_size = result_size;
3064 	idelta.delta_size = delta_size;
3065 	idelta.delta_compressed_size = delta_compressed_size;
3066 	idelta.delta_offset = delta_offset;
3067 	idelta.delta_out_offset = delta_out_offset;
3068 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3069 
3070 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3071 	    &idelta, sizeof(idelta));
3072 	if (ret == -1)
3073 		return got_error_from_errno("imsg_compose RAW_DELTA");
3074 
3075 	return flush_imsg(ibuf);
3076 }
3077 
3078 const struct got_error *
3079 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3080     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3081     off_t *delta_out_offset, struct got_object_id **base_id,
3082     struct imsgbuf *ibuf)
3083 {
3084 	const struct got_error *err = NULL;
3085 	struct imsg imsg;
3086 	struct got_imsg_raw_delta *delta;
3087 	size_t datalen;
3088 
3089 	*base_size = 0;
3090 	*result_size = 0;
3091 	*delta_size = 0;
3092 	*delta_compressed_size = 0;
3093 	*delta_offset = 0;
3094 	*delta_out_offset = 0;
3095 	*base_id = NULL;
3096 
3097 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3098 	if (err)
3099 		return err;
3100 
3101 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3102 
3103 	switch (imsg.hdr.type) {
3104 	case GOT_IMSG_RAW_DELTA:
3105 		if (datalen != sizeof(*delta)) {
3106 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3107 			break;
3108 		}
3109 		delta = imsg.data;
3110 		*base_size = delta->base_size;
3111 		*result_size = delta->result_size;
3112 		*delta_size = delta->delta_size;
3113 		*delta_compressed_size = delta->delta_compressed_size;
3114 		*delta_offset = delta->delta_offset;
3115 		*delta_out_offset = delta->delta_out_offset;
3116 		*base_id = calloc(1, sizeof(**base_id));
3117 		if (*base_id == NULL) {
3118 			err = got_error_from_errno("malloc");
3119 			break;
3120 		}
3121 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3122 		break;
3123 	default:
3124 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3125 		break;
3126 	}
3127 
3128 	imsg_free(&imsg);
3129 
3130 	if (err) {
3131 		free(*base_id);
3132 		*base_id = NULL;
3133 	}
3134 	return err;
3135 }
3136 
3137 static const struct got_error *
3138 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3139 {
3140 	const struct got_error *err = NULL;
3141 	struct got_imsg_object_idlist idlist;
3142 	struct ibuf *wbuf;
3143 	size_t i;
3144 
3145 	memset(&idlist, 0, sizeof(idlist));
3146 
3147 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3148 		return got_error(GOT_ERR_NO_SPACE);
3149 
3150 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3151 	    sizeof(idlist) + nids * sizeof(**ids));
3152 	if (wbuf == NULL) {
3153 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3154 		return err;
3155 	}
3156 
3157 	idlist.nids = nids;
3158 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3159 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3160 
3161 	for (i = 0; i < nids; i++) {
3162 		struct got_object_id *id = ids[i];
3163 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3164 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3165 	}
3166 
3167 	wbuf->fd = -1;
3168 	imsg_close(ibuf, wbuf);
3169 
3170 	return flush_imsg(ibuf);
3171 }
3172 
3173 const struct got_error *
3174 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3175     struct got_object_id **ids, size_t nids)
3176 {
3177 	const struct got_error *err = NULL;
3178 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3179 	int i, queued = 0;
3180 
3181 	for (i = 0; i < nids; i++) {
3182 		idlist[i % nitems(idlist)] = ids[i];
3183 		queued++;
3184 		if (queued >= nitems(idlist)) {
3185 			err = send_idlist(ibuf, idlist, queued);
3186 			if (err)
3187 				return err;
3188 			queued = 0;
3189 		}
3190 	}
3191 
3192 	if (queued > 0) {
3193 		err = send_idlist(ibuf, idlist, queued);
3194 		if (err)
3195 			return err;
3196 	}
3197 
3198 	return NULL;
3199 }
3200 
3201 const struct got_error *
3202 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3203 {
3204 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3205 	    == -1)
3206 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3207 
3208 	return flush_imsg(ibuf);
3209 }
3210 
3211 const struct got_error *
3212 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3213     size_t *nids, struct imsgbuf *ibuf)
3214 {
3215 	const struct got_error *err = NULL;
3216 	struct imsg imsg;
3217 	struct got_imsg_object_idlist *idlist;
3218 	size_t datalen;
3219 
3220 	*ids = NULL;
3221 	*done = 0;
3222 	*nids = 0;
3223 
3224 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3225 	if (err)
3226 		return err;
3227 
3228 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3229 	switch (imsg.hdr.type) {
3230 	case GOT_IMSG_OBJ_ID_LIST:
3231 		if (datalen < sizeof(*idlist)) {
3232 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3233 			break;
3234 		}
3235 		idlist = imsg.data;
3236 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3237 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3238 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3239 			break;
3240 		}
3241 		*nids = idlist->nids;
3242 		*ids = calloc(*nids, sizeof(**ids));
3243 		if (*ids == NULL) {
3244 			err = got_error_from_errno("calloc");
3245 			break;
3246 		}
3247 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3248 		    *nids * sizeof(**ids));
3249 		break;
3250 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3251 		*done = 1;
3252 		break;
3253 	default:
3254 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3255 		break;
3256 	}
3257 
3258 	imsg_free(&imsg);
3259 
3260 	return err;
3261 }
3262 
3263 const struct got_error *
3264 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3265 {
3266 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3267 	    == -1)
3268 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3269 
3270 	return flush_imsg(ibuf);
3271 }
3272 
3273 const struct got_error *
3274 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3275     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3276 {
3277 	const struct got_error *err = NULL;
3278 	struct ibuf *wbuf;
3279 	struct got_imsg_reused_deltas ideltas;
3280 	size_t i;
3281 
3282 	memset(&ideltas, 0, sizeof(ideltas));
3283 
3284 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3285 		return got_error(GOT_ERR_NO_SPACE);
3286 
3287 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3288 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3289 	if (wbuf == NULL) {
3290 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3291 		return err;
3292 	}
3293 
3294 	ideltas.ndeltas = ndeltas;
3295 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3296 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3297 
3298 	for (i = 0; i < ndeltas; i++) {
3299 		struct got_imsg_reused_delta *delta = &deltas[i];
3300 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3301 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3302 	}
3303 
3304 	wbuf->fd = -1;
3305 	imsg_close(ibuf, wbuf);
3306 
3307 	return flush_imsg(ibuf);
3308 }
3309 
3310 const struct got_error *
3311 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3312 {
3313 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3314 	    == -1)
3315 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3316 
3317 	return flush_imsg(ibuf);
3318 }
3319 
3320 const struct got_error *
3321 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3322     size_t *ndeltas, struct imsgbuf *ibuf)
3323 {
3324 	const struct got_error *err = NULL;
3325 	struct imsg imsg;
3326 	struct got_imsg_reused_deltas *ideltas;
3327 	size_t datalen;
3328 
3329 	*done = 0;
3330 	*ndeltas = 0;
3331 
3332 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3333 	if (err)
3334 		return err;
3335 
3336 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3337 	switch (imsg.hdr.type) {
3338 	case GOT_IMSG_REUSED_DELTAS:
3339 		if (datalen < sizeof(*ideltas)) {
3340 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3341 			break;
3342 		}
3343 		ideltas = imsg.data;
3344 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3345 		    ideltas->ndeltas * sizeof(*deltas) >
3346 		    datalen - sizeof(*ideltas)) {
3347 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3348 			break;
3349 		}
3350 		*ndeltas = ideltas->ndeltas;
3351 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3352 		    *ndeltas * sizeof(*deltas));
3353 		break;
3354 	case GOT_IMSG_DELTA_REUSE_DONE:
3355 		*done = 1;
3356 		break;
3357 	default:
3358 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3359 		break;
3360 	}
3361 
3362 	imsg_free(&imsg);
3363 
3364 	return err;
3365 }
3366 
3367 const struct got_error *
3368 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3369 {
3370 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3371 	    0, 0, -1, NULL, 0)
3372 	    == -1)
3373 		return got_error_from_errno("imsg_compose "
3374 		    "COMMIT_PAINTING_INIT");
3375 
3376 	return flush_imsg(ibuf);
3377 }
3378 
3379 const struct got_error *
3380 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3381     struct got_object_id *id, intptr_t color)
3382 {
3383 	struct got_imsg_commit_painting_request ireq;
3384 
3385 	memset(&ireq, 0, sizeof(ireq));
3386 	memcpy(ireq.id, id->hash, sizeof(ireq.id));
3387 	ireq.idx = idx;
3388 	ireq.color = color;
3389 
3390 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3391 	    &ireq, sizeof(ireq)) == -1)
3392 		return got_error_from_errno("imsg_compose "
3393 		    "COMMIT_PAINTING_REQUEST");
3394 
3395 	return flush_imsg(ibuf);
3396 }
3397 
3398 static const struct got_error *
3399 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3400     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3401 {
3402 	const struct got_error *err = NULL;
3403 	struct ibuf *wbuf = NULL;
3404 	struct got_object_qid *qid;
3405 	size_t msglen;
3406 	int ncommits;
3407 	intptr_t color;
3408 
3409 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3410 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3411 	    sizeof(struct got_imsg_painted_commit);
3412 
3413 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3414 	if (wbuf == NULL) {
3415 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3416 		return err;
3417 	}
3418 
3419 	/* Keep in sync with struct got_imsg_painted_commits! */
3420 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3421 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3422 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3423 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3424 
3425 	while (ncommits > 0) {
3426 		qid = STAILQ_FIRST(ids);
3427 		STAILQ_REMOVE_HEAD(ids, entry);
3428 		ncommits--;
3429 		(*nids)--;
3430 		color = (intptr_t)qid->data;
3431 
3432 		/* Keep in sync with struct got_imsg_painted_commit! */
3433 		if (imsg_add(wbuf, qid->id.hash, SHA1_DIGEST_LENGTH) == -1)
3434 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3435 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3436 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3437 
3438 		got_object_qid_free(qid);
3439 	}
3440 
3441 	wbuf->fd = -1;
3442 	imsg_close(ibuf, wbuf);
3443 
3444 	return flush_imsg(ibuf);
3445 }
3446 
3447 const struct got_error *
3448 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3449     struct got_object_id_queue *ids, int *nids,
3450     int present_in_pack, int flush)
3451 {
3452 	const struct got_error *err;
3453 	size_t remain;
3454 
3455 	if (*nids <= 0)
3456 		return NULL;
3457 
3458 	do {
3459 		remain = (sizeof(struct got_imsg_painted_commits)) +
3460 		    *nids * sizeof(struct got_imsg_painted_commit);
3461 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3462 			err = send_painted_commits(ids, nids, remain,
3463 			    present_in_pack, ibuf);
3464 			if (err)
3465 				return err;
3466 		}
3467 	} while (flush && *nids > 0);
3468 
3469 	return NULL;
3470 }
3471 
3472 const struct got_error *
3473 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3474 {
3475 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3476 	    0, 0, -1, NULL, 0)
3477 	    == -1)
3478 		return got_error_from_errno("imsg_compose "
3479 		    "COMMIT_PAINTING_DONE");
3480 
3481 	return flush_imsg(ibuf);
3482 }
3483 
3484 const struct got_error *
3485 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3486     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3487 {
3488 	const struct got_error *err = NULL;
3489 	struct imsg imsg;
3490 	struct got_imsg_painted_commits icommits;
3491 	struct got_imsg_painted_commit icommit;
3492 	size_t datalen;
3493 	int i;
3494 
3495 	for (;;) {
3496 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3497 		if (err)
3498 			return err;
3499 
3500 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3501 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3502 			break;
3503 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3504 			return got_error(GOT_ERR_PRIVSEP_MSG);
3505 
3506 		if (datalen < sizeof(icommits))
3507 			return got_error(GOT_ERR_PRIVSEP_LEN);
3508 		memcpy(&icommits, imsg.data, sizeof(icommits));
3509 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3510 		    datalen < sizeof(icommits) +
3511 		    icommits.ncommits * sizeof(icommit))
3512 			return got_error(GOT_ERR_PRIVSEP_LEN);
3513 
3514 		for (i = 0; i < icommits.ncommits; i++) {
3515 			memcpy(&icommit,
3516 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3517 			    sizeof(icommit));
3518 
3519 			if (icommits.present_in_pack) {
3520 				struct got_object_id id;
3521 
3522 				memset(&id, 0, sizeof(id));
3523 				memcpy(id.hash, icommit.id, SHA1_DIGEST_LENGTH);
3524 				err = cb(cb_arg, &id, icommit.color);
3525 				if (err)
3526 					break;
3527 			} else {
3528 				struct got_object_qid *qid;
3529 				err = got_object_qid_alloc_partial(&qid);
3530 				if (err)
3531 					break;
3532 				memcpy(qid->id.hash, icommit.id,
3533 				    SHA1_DIGEST_LENGTH);
3534 				qid->data = (void *)icommit.color;
3535 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3536 			}
3537 		}
3538 
3539 		imsg_free(&imsg);
3540 	}
3541 
3542 	return err;
3543 }
3544 
3545 const struct got_error *
3546 got_privsep_unveil_exec_helpers(void)
3547 {
3548 	const char *helpers[] = {
3549 	    GOT_PATH_PROG_READ_PACK,
3550 	    GOT_PATH_PROG_READ_OBJECT,
3551 	    GOT_PATH_PROG_READ_COMMIT,
3552 	    GOT_PATH_PROG_READ_TREE,
3553 	    GOT_PATH_PROG_READ_BLOB,
3554 	    GOT_PATH_PROG_READ_TAG,
3555 	    GOT_PATH_PROG_READ_GITCONFIG,
3556 	    GOT_PATH_PROG_READ_GOTCONFIG,
3557 	    GOT_PATH_PROG_READ_PATCH,
3558 	    GOT_PATH_PROG_FETCH_PACK,
3559 	    GOT_PATH_PROG_INDEX_PACK,
3560 	    GOT_PATH_PROG_SEND_PACK,
3561 	};
3562 	size_t i;
3563 
3564 	for (i = 0; i < nitems(helpers); i++) {
3565 		if (unveil(helpers[i], "x") == 0)
3566 			continue;
3567 		return got_error_from_errno2("unveil", helpers[i]);
3568 	}
3569 
3570 	return NULL;
3571 }
3572 
3573 void
3574 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3575 {
3576 	if (close(imsg_fds[0]) == -1) {
3577 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3578 		_exit(1);
3579 	}
3580 
3581 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3582 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3583 		_exit(1);
3584 	}
3585 
3586 	closefrom(GOT_IMSG_FD_CHILD + 1);
3587 
3588 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3589 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3590 		    strerror(errno));
3591 		_exit(1);
3592 	}
3593 }