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