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Date:: Tue Jun 14 13:16:14 2022 UTC
Message:: drop unused variable
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 <unistd.h>
35 #include <zlib.h>
36 #include <time.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_sha1.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 
51 #ifndef MIN
52 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
53 #endif
54 
55 #ifndef nitems
56 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
57 #endif
58 
59 static const struct got_error *
60 poll_fd(int fd, int events, int timeout)
61 {
62 	struct pollfd pfd[1];
63 	struct timespec ts;
64 	sigset_t sigset;
65 	int n;
66 
67 	pfd[0].fd = fd;
68 	pfd[0].events = events;
69 
70 	ts.tv_sec = timeout;
71 	ts.tv_nsec = 0;
72 
73 	if (sigemptyset(&sigset) == -1)
74 		return got_error_from_errno("sigemptyset");
75 	if (sigaddset(&sigset, SIGWINCH) == -1)
76 		return got_error_from_errno("sigaddset");
77 
78 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
79 	if (n == -1)
80 		return got_error_from_errno("ppoll");
81 	if (n == 0)
82 		return got_error(GOT_ERR_TIMEOUT);
83 	if (pfd[0].revents & (POLLERR | POLLNVAL))
84 		return got_error_from_errno("poll error");
85 	if (pfd[0].revents & (events | POLLHUP))
86 		return NULL;
87 
88 	return got_error(GOT_ERR_INTERRUPT);
89 }
90 
91 static const struct got_error *
92 read_imsg(struct imsgbuf *ibuf)
93 {
94 	const struct got_error *err;
95 	size_t n;
96 
97 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
98 	if (err)
99 		return err;
100 
101 	n = imsg_read(ibuf);
102 	if (n == -1) {
103 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
104 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
105 		return got_error(GOT_ERR_PRIVSEP_READ);
106 	}
107 	if (n == 0)
108 		return got_error(GOT_ERR_PRIVSEP_PIPE);
109 
110 	return NULL;
111 }
112 
113 const struct got_error *
114 got_privsep_wait_for_child(pid_t pid)
115 {
116 	int child_status;
117 
118 	if (waitpid(pid, &child_status, 0) == -1)
119 		return got_error_from_errno("waitpid");
120 
121 	if (!WIFEXITED(child_status))
122 		return got_error(GOT_ERR_PRIVSEP_DIED);
123 
124 	if (WEXITSTATUS(child_status) != 0)
125 		return got_error(GOT_ERR_PRIVSEP_EXIT);
126 
127 	return NULL;
128 }
129 
130 static const struct got_error *
131 recv_imsg_error(struct imsg *imsg, size_t datalen)
132 {
133 	struct got_imsg_error *ierr;
134 
135 	if (datalen != sizeof(*ierr))
136 		return got_error(GOT_ERR_PRIVSEP_LEN);
137 
138 	ierr = imsg->data;
139 	if (ierr->code == GOT_ERR_ERRNO) {
140 		static struct got_error serr;
141 		serr.code = GOT_ERR_ERRNO;
142 		serr.msg = strerror(ierr->errno_code);
143 		return &serr;
144 	}
145 
146 	return got_error(ierr->code);
147 }
148 
149 const struct got_error *
150 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
151     size_t min_datalen)
152 {
153 	const struct got_error *err;
154 	ssize_t n;
155 
156 	n = imsg_get(ibuf, imsg);
157 	if (n == -1)
158 		return got_error_from_errno("imsg_get");
159 
160 	while (n == 0) {
161 		err = read_imsg(ibuf);
162 		if (err)
163 			return err;
164 		n = imsg_get(ibuf, imsg);
165 		if (n == -1)
166 			return got_error_from_errno("imsg_get");
167 	}
168 
169 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
170 		return got_error(GOT_ERR_PRIVSEP_LEN);
171 
172 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
173 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
174 		return recv_imsg_error(imsg, datalen);
175 	}
176 
177 	return NULL;
178 }
179 
180 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
181 void
182 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
183 {
184 	const struct got_error *poll_err;
185 	struct got_imsg_error ierr;
186 	int ret;
187 
188 	ierr.code = err->code;
189 	if (err->code == GOT_ERR_ERRNO)
190 		ierr.errno_code = errno;
191 	else
192 		ierr.errno_code = 0;
193 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
194 	if (ret == -1) {
195 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
196 		    getprogname(), err->code, err->msg, strerror(errno));
197 		return;
198 	}
199 
200 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
201 	if (poll_err) {
202 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
203 		    getprogname(), err->code, err->msg, poll_err->msg);
204 		return;
205 	}
206 
207 	ret = imsg_flush(ibuf);
208 	if (ret == -1) {
209 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
210 		    getprogname(), err->code, err->msg, strerror(errno));
211 		imsg_clear(ibuf);
212 		return;
213 	}
214 }
215 
216 static const struct got_error *
217 flush_imsg(struct imsgbuf *ibuf)
218 {
219 	const struct got_error *err;
220 
221 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
222 	if (err)
223 		return err;
224 
225 	if (imsg_flush(ibuf) == -1) {
226 		imsg_clear(ibuf);
227 		return got_error_from_errno("imsg_flush");
228 	}
229 
230 	return NULL;
231 }
232 
233 const struct got_error *
234 got_privsep_flush_imsg(struct imsgbuf *ibuf)
235 {
236 	return flush_imsg(ibuf);
237 }
238 
239 const struct got_error *
240 got_privsep_send_stop(int fd)
241 {
242 	const struct got_error *err = NULL;
243 	struct imsgbuf ibuf;
244 
245 	imsg_init(&ibuf, fd);
246 
247 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
248 		return got_error_from_errno("imsg_compose STOP");
249 
250 	err = flush_imsg(&ibuf);
251 	return err;
252 }
253 
254 const struct got_error *
255 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
256     struct got_object_id *id)
257 {
258 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
259 	    id, sizeof(*id)) == -1)
260 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
261 
262 	return flush_imsg(ibuf);
263 }
264 
265 const struct got_error *
266 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
267     struct got_object_id *id)
268 {
269 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
270 	    id, sizeof(*id)) == -1)
271 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
272 
273 	return flush_imsg(ibuf);
274 }
275 
276 const struct got_error *
277 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
278 {
279 	const struct got_error *err = NULL;
280 
281 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
282 	    == -1) {
283 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
284 		close(outfd);
285 		return err;
286 	}
287 
288 	return flush_imsg(ibuf);
289 }
290 
291 const struct got_error *
292 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
293     uint8_t *data)
294 {
295 	const struct got_error *err = NULL;
296 	struct got_imsg_raw_obj iobj;
297 	size_t len = sizeof(iobj);
298 	struct ibuf *wbuf;
299 
300 	iobj.hdrlen = hdrlen;
301 	iobj.size = size;
302 
303 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
304 		len += (size_t)size + hdrlen;
305 
306 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
307 	if (wbuf == NULL) {
308 		err = got_error_from_errno("imsg_create RAW_OBJECT");
309 		return err;
310 	}
311 
312 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
313 		return got_error_from_errno("imsg_add RAW_OBJECT");
314 
315 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
316 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
317 			return got_error_from_errno("imsg_add RAW_OBJECT");
318 	}
319 
320 	wbuf->fd = -1;
321 	imsg_close(ibuf, wbuf);
322 
323 	return flush_imsg(ibuf);
324 }
325 
326 const struct got_error *
327 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
328     struct imsgbuf *ibuf)
329 {
330 	const struct got_error *err = NULL;
331 	struct imsg imsg;
332 	struct got_imsg_raw_obj *iobj;
333 	size_t datalen;
334 
335 	*outbuf = NULL;
336 
337 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
338 	if (err)
339 		return err;
340 
341 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
342 
343 	switch (imsg.hdr.type) {
344 	case GOT_IMSG_RAW_OBJECT:
345 		if (datalen < sizeof(*iobj)) {
346 			err = got_error(GOT_ERR_PRIVSEP_LEN);
347 			break;
348 		}
349 		iobj = imsg.data;
350 		*size = iobj->size;
351 		*hdrlen = iobj->hdrlen;
352 
353 		if (datalen == sizeof(*iobj)) {
354 			/* Data has been written to file descriptor. */
355 			break;
356 		}
357 
358 		if (*size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
359 			err = got_error(GOT_ERR_PRIVSEP_LEN);
360 			break;
361 		}
362 
363 		*outbuf = malloc(*size + *hdrlen);
364 		if (*outbuf == NULL) {
365 			err = got_error_from_errno("malloc");
366 			break;
367 		}
368 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
369 		break;
370 	default:
371 		err = got_error(GOT_ERR_PRIVSEP_MSG);
372 		break;
373 	}
374 
375 	imsg_free(&imsg);
376 
377 	return err;
378 }
379 
380 const struct got_error *
381 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
382     struct got_object_id *id, int pack_idx)
383 {
384 	const struct got_error *err = NULL;
385 	struct got_imsg_packed_object iobj;
386 	void *data;
387 	size_t len;
388 
389 	if (pack_idx != -1) { /* commit is packed */
390 		iobj.idx = pack_idx;
391 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
392 		data = &iobj;
393 		len = sizeof(iobj);
394 	} else {
395 		data = id;
396 		len = sizeof(*id);
397 	}
398 
399 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
400 	    == -1) {
401 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
402 		close(fd);
403 		return err;
404 	}
405 
406 	return flush_imsg(ibuf);
407 }
408 
409 const struct got_error *
410 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
411     struct got_object_id *id, int pack_idx)
412 {
413 	struct ibuf *wbuf;
414 	size_t len;
415 
416 	if (pack_idx != -1)
417 		len = sizeof(struct got_imsg_packed_object);
418 	else
419 		len = sizeof(*id);
420 
421 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
422 	if (wbuf == NULL)
423 		return got_error_from_errno("imsg_create TREE_REQUEST");
424 
425 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
426 		return got_error_from_errno("imsg_add TREE_REQUEST");
427 
428 	if (pack_idx != -1) { /* tree is packed */
429 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
430 			return got_error_from_errno("imsg_add TREE_REQUEST");
431 	}
432 
433 	wbuf->fd = fd;
434 	imsg_close(ibuf, wbuf);
435 
436 	return flush_imsg(ibuf);
437 }
438 
439 const struct got_error *
440 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
441     struct got_object_id *id, int pack_idx)
442 {
443 	struct got_imsg_packed_object iobj;
444 	void *data;
445 	size_t len;
446 
447 	if (pack_idx != -1) { /* tag is packed */
448 		iobj.idx = pack_idx;
449 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
450 		data = &iobj;
451 		len = sizeof(iobj);
452 	} else {
453 		data = id;
454 		len = sizeof(*id);
455 	}
456 
457 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
458 	    == -1)
459 		return got_error_from_errno("imsg_compose TAG_REQUEST");
460 
461 	return flush_imsg(ibuf);
462 }
463 
464 const struct got_error *
465 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
466     struct got_object_id *id, int pack_idx)
467 {
468 	const struct got_error *err = NULL;
469 	struct got_imsg_packed_object iobj;
470 	void *data;
471 	size_t len;
472 
473 	if (pack_idx != -1) { /* blob is packed */
474 		iobj.idx = pack_idx;
475 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
476 		data = &iobj;
477 		len = sizeof(iobj);
478 	} else {
479 		data = id;
480 		len = sizeof(*id);
481 	}
482 
483 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
484 	    == -1) {
485 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
486 		close(infd);
487 		return err;
488 	}
489 
490 	return flush_imsg(ibuf);
491 }
492 
493 const struct got_error *
494 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
495 {
496 	const struct got_error *err = NULL;
497 
498 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
499 	    == -1) {
500 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
501 		close(outfd);
502 		return err;
503 	}
504 
505 	return flush_imsg(ibuf);
506 }
507 
508 static const struct got_error *
509 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
510 {
511 	const struct got_error *err = NULL;
512 
513 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
514 		err = got_error_from_errno("imsg_compose TMPFD");
515 		close(fd);
516 		return err;
517 	}
518 
519 	return flush_imsg(ibuf);
520 }
521 
522 const struct got_error *
523 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
524 {
525 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
526 }
527 
528 const struct got_error *
529 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
530 {
531 	struct got_imsg_object iobj;
532 
533 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
534 	iobj.type = obj->type;
535 	iobj.flags = obj->flags;
536 	iobj.hdrlen = obj->hdrlen;
537 	iobj.size = obj->size;
538 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
539 		iobj.pack_offset = obj->pack_offset;
540 		iobj.pack_idx = obj->pack_idx;
541 	}
542 
543 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
544 	    == -1)
545 		return got_error_from_errno("imsg_compose OBJECT");
546 
547 	return flush_imsg(ibuf);
548 }
549 
550 const struct got_error *
551 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
552     struct got_pathlist_head *have_refs, int fetch_all_branches,
553     struct got_pathlist_head *wanted_branches,
554     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
555 {
556 	const struct got_error *err = NULL;
557 	struct ibuf *wbuf;
558 	size_t len;
559 	struct got_pathlist_entry *pe;
560 	struct got_imsg_fetch_request fetchreq;
561 
562 	memset(&fetchreq, 0, sizeof(fetchreq));
563 	fetchreq.fetch_all_branches = fetch_all_branches;
564 	fetchreq.list_refs_only = list_refs_only;
565 	fetchreq.verbosity = verbosity;
566 	TAILQ_FOREACH(pe, have_refs, entry)
567 		fetchreq.n_have_refs++;
568 	TAILQ_FOREACH(pe, wanted_branches, entry)
569 		fetchreq.n_wanted_branches++;
570 	TAILQ_FOREACH(pe, wanted_refs, entry)
571 		fetchreq.n_wanted_refs++;
572 	len = sizeof(struct got_imsg_fetch_request);
573 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
574 		close(fd);
575 		return got_error(GOT_ERR_NO_SPACE);
576 	}
577 
578 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
579 	    &fetchreq, sizeof(fetchreq)) == -1)
580 		return got_error_from_errno(
581 		    "imsg_compose FETCH_SERVER_PROGRESS");
582 
583 	err = flush_imsg(ibuf);
584 	if (err) {
585 		close(fd);
586 		return err;
587 	}
588 	fd = -1;
589 
590 	TAILQ_FOREACH(pe, have_refs, entry) {
591 		const char *name = pe->path;
592 		size_t name_len = pe->path_len;
593 		struct got_object_id *id = pe->data;
594 
595 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
596 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
597 		if (wbuf == NULL)
598 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
599 
600 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
601 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
602 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
603 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
604 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
605 		if (imsg_add(wbuf, name, name_len) == -1)
606 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
607 
608 		wbuf->fd = -1;
609 		imsg_close(ibuf, wbuf);
610 		err = flush_imsg(ibuf);
611 		if (err)
612 			return err;
613 	}
614 
615 	TAILQ_FOREACH(pe, wanted_branches, entry) {
616 		const char *name = pe->path;
617 		size_t name_len = pe->path_len;
618 
619 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
620 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
621 		    len);
622 		if (wbuf == NULL)
623 			return got_error_from_errno(
624 			    "imsg_create FETCH_WANTED_BRANCH");
625 
626 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
627 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
628 			return got_error_from_errno(
629 			    "imsg_add FETCH_WANTED_BRANCH");
630 		if (imsg_add(wbuf, name, name_len) == -1)
631 			return got_error_from_errno(
632 			    "imsg_add FETCH_WANTED_BRANCH");
633 
634 		wbuf->fd = -1;
635 		imsg_close(ibuf, wbuf);
636 		err = flush_imsg(ibuf);
637 		if (err)
638 			return err;
639 	}
640 
641 	TAILQ_FOREACH(pe, wanted_refs, entry) {
642 		const char *name = pe->path;
643 		size_t name_len = pe->path_len;
644 
645 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
646 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
647 		    len);
648 		if (wbuf == NULL)
649 			return got_error_from_errno(
650 			    "imsg_create FETCH_WANTED_REF");
651 
652 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
653 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
654 			return got_error_from_errno(
655 			    "imsg_add FETCH_WANTED_REF");
656 		if (imsg_add(wbuf, name, name_len) == -1)
657 			return got_error_from_errno(
658 			    "imsg_add FETCH_WANTED_REF");
659 
660 		wbuf->fd = -1;
661 		imsg_close(ibuf, wbuf);
662 		err = flush_imsg(ibuf);
663 		if (err)
664 			return err;
665 	}
666 
667 
668 	return NULL;
669 
670 }
671 
672 const struct got_error *
673 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
674 {
675 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
676 }
677 
678 const struct got_error *
679 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
680     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
681     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
682 {
683 	const struct got_error *err = NULL;
684 	struct imsg imsg;
685 	size_t datalen;
686 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
687 	size_t n, remain;
688 	off_t off;
689 	int i;
690 
691 	*done = 0;
692 	*id = NULL;
693 	*refname = NULL;
694 	*server_progress = NULL;
695 	*packfile_size = 0;
696 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
697 
698 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
699 	if (err)
700 		return err;
701 
702 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
703 	switch (imsg.hdr.type) {
704 	case GOT_IMSG_ERROR:
705 		err = recv_imsg_error(&imsg, datalen);
706 		break;
707 	case GOT_IMSG_FETCH_SYMREFS:
708 		if (datalen < sizeof(*isymrefs)) {
709 			err = got_error(GOT_ERR_PRIVSEP_LEN);
710 			break;
711 		}
712 		if (isymrefs != NULL) {
713 			err = got_error(GOT_ERR_PRIVSEP_MSG);
714 			break;
715 		}
716 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
717 		off = sizeof(*isymrefs);
718 		remain = datalen - off;
719 		for (n = 0; n < isymrefs->nsymrefs; n++) {
720 			struct got_imsg_fetch_symref *s;
721 			char *name, *target;
722 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
723 				err = got_error(GOT_ERR_PRIVSEP_LEN);
724 				goto done;
725 			}
726 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
727 			off += sizeof(*s);
728 			remain -= sizeof(*s);
729 			if (remain < s->name_len) {
730 				err = got_error(GOT_ERR_PRIVSEP_LEN);
731 				goto done;
732 			}
733 			name = strndup(imsg.data + off, s->name_len);
734 			if (name == NULL) {
735 				err = got_error_from_errno("strndup");
736 				goto done;
737 			}
738 			off += s->name_len;
739 			remain -= s->name_len;
740 			if (remain < s->target_len) {
741 				err = got_error(GOT_ERR_PRIVSEP_LEN);
742 				free(name);
743 				goto done;
744 			}
745 			target = strndup(imsg.data + off, s->target_len);
746 			if (target == NULL) {
747 				err = got_error_from_errno("strndup");
748 				free(name);
749 				goto done;
750 			}
751 			off += s->target_len;
752 			remain -= s->target_len;
753 			err = got_pathlist_append(symrefs, name, target);
754 			if (err) {
755 				free(name);
756 				free(target);
757 				goto done;
758 			}
759 		}
760 		break;
761 	case GOT_IMSG_FETCH_REF:
762 		if (datalen <= SHA1_DIGEST_LENGTH) {
763 			err = got_error(GOT_ERR_PRIVSEP_MSG);
764 			break;
765 		}
766 		*id = malloc(sizeof(**id));
767 		if (*id == NULL) {
768 			err = got_error_from_errno("malloc");
769 			break;
770 		}
771 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
772 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
773 		    datalen - SHA1_DIGEST_LENGTH);
774 		if (*refname == NULL) {
775 			err = got_error_from_errno("strndup");
776 			break;
777 		}
778 		break;
779 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
780 		if (datalen == 0) {
781 			err = got_error(GOT_ERR_PRIVSEP_LEN);
782 			break;
783 		}
784 		*server_progress = strndup(imsg.data, datalen);
785 		if (*server_progress == NULL) {
786 			err = got_error_from_errno("strndup");
787 			break;
788 		}
789 		for (i = 0; i < datalen; i++) {
790 			if (!isprint((unsigned char)(*server_progress)[i]) &&
791 			    !isspace((unsigned char)(*server_progress)[i])) {
792 				err = got_error(GOT_ERR_PRIVSEP_MSG);
793 				free(*server_progress);
794 				*server_progress = NULL;
795 				goto done;
796 			}
797 		}
798 		break;
799 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
800 		if (datalen < sizeof(*packfile_size)) {
801 			err = got_error(GOT_ERR_PRIVSEP_MSG);
802 			break;
803 		}
804 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
805 		break;
806 	case GOT_IMSG_FETCH_DONE:
807 		if (datalen != SHA1_DIGEST_LENGTH) {
808 			err = got_error(GOT_ERR_PRIVSEP_MSG);
809 			break;
810 		}
811 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
812 		*done = 1;
813 		break;
814 	default:
815 		err = got_error(GOT_ERR_PRIVSEP_MSG);
816 		break;
817 	}
818 done:
819 	if (err) {
820 		free(*id);
821 		*id = NULL;
822 		free(*refname);
823 		*refname = NULL;
824 	}
825 	imsg_free(&imsg);
826 	return err;
827 }
828 
829 static const struct got_error *
830 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
831     int delete, struct imsgbuf *ibuf)
832 {
833 	size_t len;
834 	struct ibuf *wbuf;
835 
836 	len = sizeof(struct got_imsg_send_ref) + name_len;
837 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
838 	if (wbuf == NULL)
839 		return got_error_from_errno("imsg_create SEND_REF");
840 
841 	/* Keep in sync with struct got_imsg_send_ref! */
842 	if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
843 		return got_error_from_errno("imsg_add SEND_REF");
844 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
845 		return got_error_from_errno("imsg_add SEND_REF");
846 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
847 		return got_error_from_errno("imsg_add SEND_REF");
848 	if (imsg_add(wbuf, name, name_len) == -1)
849 		return got_error_from_errno("imsg_add SEND_REF");
850 
851 	wbuf->fd = -1;
852 	imsg_close(ibuf, wbuf);
853 	return flush_imsg(ibuf);
854 }
855 
856 const struct got_error *
857 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
858     struct got_pathlist_head *have_refs,
859     struct got_pathlist_head *delete_refs,
860     int verbosity)
861 {
862 	const struct got_error *err = NULL;
863 	struct got_pathlist_entry *pe;
864 	struct got_imsg_send_request sendreq;
865 	struct got_object_id zero_id;
866 
867 	memset(&zero_id, 0, sizeof(zero_id));
868 	memset(&sendreq, 0, sizeof(sendreq));
869 	sendreq.verbosity = verbosity;
870 	TAILQ_FOREACH(pe, have_refs, entry)
871 		sendreq.nrefs++;
872 	TAILQ_FOREACH(pe, delete_refs, entry)
873 		sendreq.nrefs++;
874 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
875 	    &sendreq, sizeof(sendreq)) == -1) {
876 		err = got_error_from_errno(
877 		    "imsg_compose FETCH_SERVER_PROGRESS");
878 		goto done;
879 	}
880 
881 	err = flush_imsg(ibuf);
882 	if (err)
883 		goto done;
884 	fd = -1;
885 
886 	TAILQ_FOREACH(pe, have_refs, entry) {
887 		const char *name = pe->path;
888 		size_t name_len = pe->path_len;
889 		struct got_object_id *id = pe->data;
890 		err = send_send_ref(name, name_len, id, 0, ibuf);
891 		if (err)
892 			goto done;
893 	}
894 
895 	TAILQ_FOREACH(pe, delete_refs, entry) {
896 		const char *name = pe->path;
897 		size_t name_len = pe->path_len;
898 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
899 		if (err)
900 			goto done;
901 	}
902 done:
903 	if (fd != -1 && close(fd) == -1 && err == NULL)
904 		err = got_error_from_errno("close");
905 	return err;
906 
907 }
908 
909 const struct got_error *
910 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
911     struct imsgbuf *ibuf)
912 {
913 	const struct got_error *err = NULL;
914 	struct imsg imsg;
915 	size_t datalen;
916 	int done = 0;
917 	struct got_imsg_send_remote_ref iremote_ref;
918 	struct got_object_id *id = NULL;
919 	char *refname = NULL;
920 	struct got_pathlist_entry *new;
921 
922 	while (!done) {
923 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
924 		if (err)
925 			return err;
926 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
927 		switch (imsg.hdr.type) {
928 		case GOT_IMSG_ERROR:
929 			err = recv_imsg_error(&imsg, datalen);
930 			goto done;
931 		case GOT_IMSG_SEND_REMOTE_REF:
932 			if (datalen < sizeof(iremote_ref)) {
933 				err = got_error(GOT_ERR_PRIVSEP_MSG);
934 				goto done;
935 			}
936 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
937 			if (datalen != sizeof(iremote_ref) +
938 			    iremote_ref.name_len) {
939 				err = got_error(GOT_ERR_PRIVSEP_MSG);
940 				goto done;
941 			}
942 			id = malloc(sizeof(*id));
943 			if (id == NULL) {
944 				err = got_error_from_errno("malloc");
945 				goto done;
946 			}
947 			memcpy(id->sha1, iremote_ref.id, SHA1_DIGEST_LENGTH);
948 			refname = strndup(imsg.data + sizeof(iremote_ref),
949 			    datalen - sizeof(iremote_ref));
950 			if (refname == NULL) {
951 				err = got_error_from_errno("strndup");
952 				goto done;
953 			}
954 			err = got_pathlist_insert(&new, remote_refs,
955 			    refname, id);
956 			if (err)
957 				goto done;
958 			if (new == NULL) { /* duplicate which wasn't inserted */
959 				free(id);
960 				free(refname);
961 			}
962 			id = NULL;
963 			refname = NULL;
964 			break;
965 		case GOT_IMSG_SEND_PACK_REQUEST:
966 			if (datalen != 0) {
967 				err = got_error(GOT_ERR_PRIVSEP_MSG);
968 				goto done;
969 			}
970 			/* got-send-pack is now waiting for a pack file. */
971 			done = 1;
972 			break;
973 		default:
974 			err = got_error(GOT_ERR_PRIVSEP_MSG);
975 			break;
976 		}
977 	}
978 done:
979 	free(id);
980 	free(refname);
981 	imsg_free(&imsg);
982 	return err;
983 }
984 
985 const struct got_error *
986 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
987 {
988 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
989 }
990 
991 const struct got_error *
992 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
993     int *success, char **refname, struct imsgbuf *ibuf)
994 {
995 	const struct got_error *err = NULL;
996 	struct imsg imsg;
997 	size_t datalen;
998 	struct got_imsg_send_ref_status iref_status;
999 
1000 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1001 	*done = 0;
1002 	*success = 0;
1003 	*refname = NULL;
1004 
1005 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1006 	if (err)
1007 		return err;
1008 
1009 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1010 	switch (imsg.hdr.type) {
1011 	case GOT_IMSG_ERROR:
1012 		err = recv_imsg_error(&imsg, datalen);
1013 		break;
1014 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1015 		if (datalen < sizeof(*bytes_sent)) {
1016 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1017 			break;
1018 		}
1019 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1020 		break;
1021 	case GOT_IMSG_SEND_REF_STATUS:
1022 		if (datalen < sizeof(iref_status)) {
1023 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1024 			break;
1025 		}
1026 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1027 		if (datalen != sizeof(iref_status) + iref_status.name_len) {
1028 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1029 			break;
1030 		}
1031 		*success = iref_status.success;
1032 		*refname = strndup(imsg.data + sizeof(iref_status),
1033 		    iref_status.name_len);
1034 		break;
1035 	case GOT_IMSG_SEND_DONE:
1036 		if (datalen != 0) {
1037 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1038 			break;
1039 		}
1040 		*done = 1;
1041 		break;
1042 	default:
1043 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1044 		break;
1045 	}
1046 
1047 	imsg_free(&imsg);
1048 	return err;
1049 }
1050 
1051 const struct got_error *
1052 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1053     int fd)
1054 {
1055 	const struct got_error *err = NULL;
1056 
1057 	/* Keep in sync with struct got_imsg_index_pack_request */
1058 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1059 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1060 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1061 		close(fd);
1062 		return err;
1063 	}
1064 	return flush_imsg(ibuf);
1065 }
1066 
1067 const struct got_error *
1068 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1069 {
1070 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1071 }
1072 
1073 const struct got_error *
1074 got_privsep_recv_index_progress(int *done, int *nobj_total,
1075     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1076     struct imsgbuf *ibuf)
1077 {
1078 	const struct got_error *err = NULL;
1079 	struct imsg imsg;
1080 	struct got_imsg_index_pack_progress *iprogress;
1081 	size_t datalen;
1082 
1083 	*done = 0;
1084 	*nobj_total = 0;
1085 	*nobj_indexed = 0;
1086 	*nobj_resolved = 0;
1087 
1088 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1089 	if (err)
1090 		return err;
1091 
1092 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1093 	switch (imsg.hdr.type) {
1094 	case GOT_IMSG_ERROR:
1095 		err = recv_imsg_error(&imsg, datalen);
1096 		break;
1097 	case GOT_IMSG_IDXPACK_PROGRESS:
1098 		if (datalen < sizeof(*iprogress)) {
1099 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1100 			break;
1101 		}
1102 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1103 		*nobj_total = iprogress->nobj_total;
1104 		*nobj_indexed = iprogress->nobj_indexed;
1105 		*nobj_loose = iprogress->nobj_loose;
1106 		*nobj_resolved = iprogress->nobj_resolved;
1107 		break;
1108 	case GOT_IMSG_IDXPACK_DONE:
1109 		if (datalen != 0) {
1110 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1111 			break;
1112 		}
1113 		*done = 1;
1114 		break;
1115 	default:
1116 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1117 		break;
1118 	}
1119 
1120 	imsg_free(&imsg);
1121 	return err;
1122 }
1123 
1124 const struct got_error *
1125 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1126     struct imsgbuf *ibuf)
1127 {
1128 	struct got_imsg_object *iobj;
1129 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1130 
1131 	if (datalen != sizeof(*iobj))
1132 		return got_error(GOT_ERR_PRIVSEP_LEN);
1133 	iobj = imsg->data;
1134 
1135 	*obj = calloc(1, sizeof(**obj));
1136 	if (*obj == NULL)
1137 		return got_error_from_errno("calloc");
1138 
1139 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1140 	(*obj)->type = iobj->type;
1141 	(*obj)->flags = iobj->flags;
1142 	(*obj)->hdrlen = iobj->hdrlen;
1143 	(*obj)->size = iobj->size;
1144 	/* path_packfile is handled by caller */
1145 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1146 		(*obj)->pack_offset = iobj->pack_offset;
1147 		(*obj)->pack_idx = iobj->pack_idx;
1148 	}
1149 	STAILQ_INIT(&(*obj)->deltas.entries);
1150 	return NULL;
1151 }
1152 
1153 const struct got_error *
1154 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1155 {
1156 	const struct got_error *err = NULL;
1157 	struct imsg imsg;
1158 	const size_t min_datalen =
1159 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1160 
1161 	*obj = NULL;
1162 
1163 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1164 	if (err)
1165 		return err;
1166 
1167 	switch (imsg.hdr.type) {
1168 	case GOT_IMSG_OBJECT:
1169 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1170 		break;
1171 	default:
1172 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1173 		break;
1174 	}
1175 
1176 	imsg_free(&imsg);
1177 
1178 	return err;
1179 }
1180 
1181 static const struct got_error *
1182 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1183     size_t logmsg_len)
1184 {
1185 	const struct got_error *err = NULL;
1186 	size_t offset, remain;
1187 
1188 	offset = 0;
1189 	remain = logmsg_len;
1190 	while (remain > 0) {
1191 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1192 
1193 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1194 		    commit->logmsg + offset, n) == -1) {
1195 			err = got_error_from_errno("imsg_compose "
1196 			    "COMMIT_LOGMSG");
1197 			break;
1198 		}
1199 
1200 		err = flush_imsg(ibuf);
1201 		if (err)
1202 			break;
1203 
1204 		offset += n;
1205 		remain -= n;
1206 	}
1207 
1208 	return err;
1209 }
1210 
1211 const struct got_error *
1212 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1213 {
1214 	const struct got_error *err = NULL;
1215 	struct got_imsg_commit_object *icommit;
1216 	uint8_t *buf;
1217 	size_t len, total;
1218 	struct got_object_qid *qid;
1219 	size_t author_len = strlen(commit->author);
1220 	size_t committer_len = strlen(commit->committer);
1221 	size_t logmsg_len = strlen(commit->logmsg);
1222 
1223 	total = sizeof(*icommit) + author_len + committer_len +
1224 	    commit->nparents * SHA1_DIGEST_LENGTH;
1225 
1226 	buf = malloc(total);
1227 	if (buf == NULL)
1228 		return got_error_from_errno("malloc");
1229 
1230 	icommit = (struct got_imsg_commit_object *)buf;
1231 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1232 	    sizeof(icommit->tree_id));
1233 	icommit->author_len = author_len;
1234 	icommit->author_time = commit->author_time;
1235 	icommit->author_gmtoff = commit->author_gmtoff;
1236 	icommit->committer_len = committer_len;
1237 	icommit->committer_time = commit->committer_time;
1238 	icommit->committer_gmtoff = commit->committer_gmtoff;
1239 	icommit->logmsg_len = logmsg_len;
1240 	icommit->nparents = commit->nparents;
1241 
1242 	len = sizeof(*icommit);
1243 	memcpy(buf + len, commit->author, author_len);
1244 	len += author_len;
1245 	memcpy(buf + len, commit->committer, committer_len);
1246 	len += committer_len;
1247 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1248 		memcpy(buf + len, &qid->id, SHA1_DIGEST_LENGTH);
1249 		len += SHA1_DIGEST_LENGTH;
1250 	}
1251 
1252 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1253 		err = got_error_from_errno("imsg_compose COMMIT");
1254 		goto done;
1255 	}
1256 
1257 	if (logmsg_len == 0 ||
1258 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1259 		err = flush_imsg(ibuf);
1260 		if (err)
1261 			goto done;
1262 	}
1263 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1264 done:
1265 	free(buf);
1266 	return err;
1267 }
1268 
1269 static const struct got_error *
1270 get_commit_from_imsg(struct got_commit_object **commit,
1271     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1272 {
1273 	const struct got_error *err = NULL;
1274 	struct got_imsg_commit_object *icommit;
1275 	size_t len = 0;
1276 	int i;
1277 
1278 	if (datalen < sizeof(*icommit))
1279 		return got_error(GOT_ERR_PRIVSEP_LEN);
1280 
1281 	icommit = imsg->data;
1282 	if (datalen != sizeof(*icommit) + icommit->author_len +
1283 	    icommit->committer_len +
1284 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1285 		return got_error(GOT_ERR_PRIVSEP_LEN);
1286 
1287 	if (icommit->nparents < 0)
1288 		return got_error(GOT_ERR_PRIVSEP_LEN);
1289 
1290 	len += sizeof(*icommit);
1291 
1292 	*commit = got_object_commit_alloc_partial();
1293 	if (*commit == NULL)
1294 		return got_error_from_errno(
1295 		    "got_object_commit_alloc_partial");
1296 
1297 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1298 	    SHA1_DIGEST_LENGTH);
1299 	(*commit)->author_time = icommit->author_time;
1300 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1301 	(*commit)->committer_time = icommit->committer_time;
1302 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1303 
1304 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1305 	if ((*commit)->author == NULL) {
1306 		err = got_error_from_errno("strndup");
1307 		goto done;
1308 	}
1309 	len += icommit->author_len;
1310 
1311 	(*commit)->committer = strndup(imsg->data + len,
1312 	    icommit->committer_len);
1313 	if ((*commit)->committer == NULL) {
1314 		err = got_error_from_errno("strndup");
1315 		goto done;
1316 	}
1317 	len += icommit->committer_len;
1318 
1319 	if (icommit->logmsg_len == 0) {
1320 		(*commit)->logmsg = strdup("");
1321 		if ((*commit)->logmsg == NULL) {
1322 			err = got_error_from_errno("strdup");
1323 			goto done;
1324 		}
1325 	} else {
1326 		size_t offset = 0, remain = icommit->logmsg_len;
1327 
1328 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1329 		if ((*commit)->logmsg == NULL) {
1330 			err = got_error_from_errno("malloc");
1331 			goto done;
1332 		}
1333 		while (remain > 0) {
1334 			struct imsg imsg_log;
1335 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1336 			    remain);
1337 
1338 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1339 			if (err)
1340 				goto done;
1341 
1342 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1343 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1344 				goto done;
1345 			}
1346 
1347 			memcpy((*commit)->logmsg + offset,
1348 			    imsg_log.data, n);
1349 			imsg_free(&imsg_log);
1350 			offset += n;
1351 			remain -= n;
1352 		}
1353 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1354 	}
1355 
1356 	for (i = 0; i < icommit->nparents; i++) {
1357 		struct got_object_qid *qid;
1358 
1359 		err = got_object_qid_alloc_partial(&qid);
1360 		if (err)
1361 			break;
1362 		memcpy(&qid->id, imsg->data + len +
1363 		    i * SHA1_DIGEST_LENGTH, sizeof(qid->id));
1364 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1365 		(*commit)->nparents++;
1366 	}
1367 done:
1368 	if (err) {
1369 		got_object_commit_close(*commit);
1370 		*commit = NULL;
1371 	}
1372 	return err;
1373 }
1374 
1375 const struct got_error *
1376 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1377 {
1378 	const struct got_error *err = NULL;
1379 	struct imsg imsg;
1380 	size_t datalen;
1381 	const size_t min_datalen =
1382 	    MIN(sizeof(struct got_imsg_error),
1383 	    sizeof(struct got_imsg_commit_object));
1384 
1385 	*commit = NULL;
1386 
1387 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1388 	if (err)
1389 		return err;
1390 
1391 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1392 
1393 	switch (imsg.hdr.type) {
1394 	case GOT_IMSG_COMMIT:
1395 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1396 		break;
1397 	default:
1398 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1399 		break;
1400 	}
1401 
1402 	imsg_free(&imsg);
1403 
1404 	return err;
1405 }
1406 
1407 static const struct got_error *
1408 send_tree_entries_batch(struct imsgbuf *ibuf,
1409     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1410 {
1411 	struct ibuf *wbuf;
1412 	struct got_imsg_tree_entries ientries;
1413 	int i;
1414 
1415 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1416 	if (wbuf == NULL)
1417 		return got_error_from_errno("imsg_create TREE_ENTRY");
1418 
1419 	ientries.nentries = idxN - idx0 + 1;
1420 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1421 		return got_error_from_errno("imsg_add TREE_ENTRY");
1422 
1423 	for (i = idx0; i <= idxN; i++) {
1424 		struct got_parsed_tree_entry *pte = &entries[i];
1425 
1426 		/* Keep in sync with struct got_imsg_tree_object definition! */
1427 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1428 			return got_error_from_errno("imsg_add TREE_ENTRY");
1429 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1430 			return got_error_from_errno("imsg_add TREE_ENTRY");
1431 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1432 			return got_error_from_errno("imsg_add TREE_ENTRY");
1433 		
1434 		/* Remaining bytes are the entry's name. */
1435 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1436 			return got_error_from_errno("imsg_add TREE_ENTRY");
1437 	}
1438 
1439 	wbuf->fd = -1;
1440 	imsg_close(ibuf, wbuf);
1441 	return NULL;
1442 }
1443 
1444 static const struct got_error *
1445 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1446     int nentries)
1447 {
1448 	const struct got_error *err = NULL;
1449 	int i, j;
1450 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1451 
1452 	i = 0;
1453 	for (j = 0; j < nentries; j++) {
1454 		struct got_parsed_tree_entry *pte = &entries[j];
1455 		size_t len = sizeof(*pte) + pte->namelen;
1456 
1457 		if (j > 0 &&
1458 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1459 			err = send_tree_entries_batch(ibuf, entries,
1460 			    i, j - 1, entries_len);
1461 			if (err)
1462 				return err;
1463 			i = j;
1464 			entries_len = sizeof(struct got_imsg_tree_entries);
1465 		}
1466 
1467 		entries_len += len;
1468 	}
1469 
1470 	if (j > 0) {
1471 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1472 		    entries_len);
1473 		if (err)
1474 			return err;
1475 	}
1476 
1477 	return NULL;
1478 }
1479 
1480 const struct got_error *
1481 got_privsep_send_tree(struct imsgbuf *ibuf,
1482     struct got_parsed_tree_entry *entries, int nentries)
1483 {
1484 	const struct got_error *err = NULL;
1485 	struct got_imsg_tree_object itree;
1486 
1487 	itree.nentries = nentries;
1488 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1489 	    == -1)
1490 		return got_error_from_errno("imsg_compose TREE");
1491 
1492 	err = send_tree_entries(ibuf, entries, nentries);
1493 	if (err)
1494 		return err;
1495 
1496 	return flush_imsg(ibuf);
1497 }
1498 
1499 
1500 static const struct got_error *
1501 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1502     int *nentries)
1503 {
1504 	const struct got_error *err = NULL;
1505 	struct got_imsg_tree_entries *ientries;
1506 	struct got_tree_entry *te;
1507 	size_t te_offset;
1508 	size_t i;
1509 
1510 	if (datalen <= sizeof(*ientries) ||
1511 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1512 		return got_error(GOT_ERR_PRIVSEP_LEN);
1513 
1514 	ientries = (struct got_imsg_tree_entries *)data;
1515 	if (ientries->nentries > INT_MAX) {
1516 		return got_error_msg(GOT_ERR_NO_SPACE,
1517 		    "too many tree entries");
1518 	}
1519 
1520 	te_offset = sizeof(*ientries);
1521 	for (i = 0; i < ientries->nentries; i++) {
1522 		struct got_imsg_tree_entry ite;
1523 		const char *te_name;
1524 		uint8_t *buf = (uint8_t *)data + te_offset;
1525 
1526 		if (te_offset >= datalen) {
1527 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1528 			break;
1529 		}
1530 
1531 		/* Might not be aligned, size is ~32 bytes. */
1532 		memcpy(&ite, buf, sizeof(ite));
1533 
1534 		if (ite.namelen >= sizeof(te->name)) {
1535 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1536 			break;
1537 		}
1538 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1539 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1540 			break;
1541 		}
1542 
1543 		if (*nentries >= tree->nentries) {
1544 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1545 			break;
1546 		}
1547 		te = &tree->entries[*nentries];
1548 		te_name = buf + sizeof(ite);
1549 		memcpy(te->name, te_name, ite.namelen);
1550 		te->name[ite.namelen] = '\0';
1551 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1552 		te->mode = ite.mode;
1553 		te->idx = *nentries;
1554 		(*nentries)++;
1555 
1556 		te_offset += sizeof(ite) + ite.namelen;
1557 	}
1558 
1559 	return err;
1560 }
1561 
1562 const struct got_error *
1563 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1564 {
1565 	const struct got_error *err = NULL;
1566 	const size_t min_datalen =
1567 	    MIN(sizeof(struct got_imsg_error),
1568 	    sizeof(struct got_imsg_tree_object));
1569 	struct got_imsg_tree_object *itree;
1570 	int nentries = 0;
1571 
1572 	*tree = NULL;
1573 
1574 	err = read_imsg(ibuf);
1575 	if (err)
1576 		goto done;
1577 
1578 	for (;;) {
1579 		struct imsg imsg;
1580 		size_t n;
1581 		size_t datalen;
1582 
1583 		n = imsg_get(ibuf, &imsg);
1584 		if (n == 0) {
1585 			if ((*tree)) {
1586 				if (nentries < (*tree)->nentries) {
1587 					err = read_imsg(ibuf);
1588 					if (err)
1589 						break;
1590 					continue;
1591 				} else
1592 					break;
1593 			} else {
1594 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1595 				break;
1596 			}
1597 		}
1598 
1599 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1600 			imsg_free(&imsg);
1601 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1602 			break;
1603 		}
1604 
1605 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1606 
1607 		switch (imsg.hdr.type) {
1608 		case GOT_IMSG_ERROR:
1609 			err = recv_imsg_error(&imsg, datalen);
1610 			break;
1611 		case GOT_IMSG_TREE:
1612 			/* This message should only appear once. */
1613 			if (*tree != NULL) {
1614 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1615 				break;
1616 			}
1617 			if (datalen != sizeof(*itree)) {
1618 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1619 				break;
1620 			}
1621 			itree = imsg.data;
1622 			if (itree->nentries < 0) {
1623 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1624 				break;
1625 			}
1626 			*tree = malloc(sizeof(**tree));
1627 			if (*tree == NULL) {
1628 				err = got_error_from_errno("malloc");
1629 				break;
1630 			}
1631 			(*tree)->entries = calloc(itree->nentries,
1632 			    sizeof(struct got_tree_entry));
1633 			if ((*tree)->entries == NULL) {
1634 				err = got_error_from_errno("malloc");
1635 				free(*tree);
1636 				*tree = NULL;
1637 				break;
1638 			}
1639 			(*tree)->nentries = itree->nentries;
1640 			(*tree)->refcnt = 0;
1641 			break;
1642 		case GOT_IMSG_TREE_ENTRIES:
1643 			/* This message should be preceeded by GOT_IMSG_TREE. */
1644 			if (*tree == NULL) {
1645 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1646 				break;
1647 			}
1648 			err = recv_tree_entries(imsg.data, datalen,
1649 			    *tree, &nentries);
1650 			break;
1651 		default:
1652 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1653 			break;
1654 		}
1655 
1656 		imsg_free(&imsg);
1657 		if (err)
1658 			break;
1659 	}
1660 done:
1661 	if (*tree && (*tree)->nentries != nentries) {
1662 		if (err == NULL)
1663 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1664 		got_object_tree_close(*tree);
1665 		*tree = NULL;
1666 	}
1667 
1668 	return err;
1669 }
1670 
1671 const struct got_error *
1672 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1673     const uint8_t *data)
1674 {
1675 	struct got_imsg_blob iblob;
1676 
1677 	iblob.size = size;
1678 	iblob.hdrlen = hdrlen;
1679 
1680 	if (data) {
1681 		uint8_t *buf;
1682 
1683 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1684 			return got_error(GOT_ERR_NO_SPACE);
1685 
1686 		buf = malloc(sizeof(iblob) + size);
1687 		if (buf == NULL)
1688 			return got_error_from_errno("malloc");
1689 
1690 		memcpy(buf, &iblob, sizeof(iblob));
1691 		memcpy(buf + sizeof(iblob), data, size);
1692 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1693 		    sizeof(iblob) + size) == -1) {
1694 			free(buf);
1695 			return got_error_from_errno("imsg_compose BLOB");
1696 		}
1697 		free(buf);
1698 	} else {
1699 		/* Data has already been written to file descriptor. */
1700 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1701 		    sizeof(iblob)) == -1)
1702 			return got_error_from_errno("imsg_compose BLOB");
1703 	}
1704 
1705 
1706 	return flush_imsg(ibuf);
1707 }
1708 
1709 const struct got_error *
1710 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1711     struct imsgbuf *ibuf)
1712 {
1713 	const struct got_error *err = NULL;
1714 	struct imsg imsg;
1715 	struct got_imsg_blob *iblob;
1716 	size_t datalen;
1717 
1718 	*outbuf = NULL;
1719 
1720 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1721 	if (err)
1722 		return err;
1723 
1724 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1725 
1726 	switch (imsg.hdr.type) {
1727 	case GOT_IMSG_BLOB:
1728 		if (datalen < sizeof(*iblob)) {
1729 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1730 			break;
1731 		}
1732 		iblob = imsg.data;
1733 		*size = iblob->size;
1734 		*hdrlen = iblob->hdrlen;
1735 
1736 		if (datalen == sizeof(*iblob)) {
1737 			/* Data has been written to file descriptor. */
1738 			break;
1739 		}
1740 
1741 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1742 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1743 			break;
1744 		}
1745 
1746 		*outbuf = malloc(*size);
1747 		if (*outbuf == NULL) {
1748 			err = got_error_from_errno("malloc");
1749 			break;
1750 		}
1751 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1752 		break;
1753 	default:
1754 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1755 		break;
1756 	}
1757 
1758 	imsg_free(&imsg);
1759 
1760 	return err;
1761 }
1762 
1763 static const struct got_error *
1764 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1765 {
1766 	const struct got_error *err = NULL;
1767 	size_t offset, remain;
1768 
1769 	offset = 0;
1770 	remain = tagmsg_len;
1771 	while (remain > 0) {
1772 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1773 
1774 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1775 		    tag->tagmsg + offset, n) == -1) {
1776 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1777 			break;
1778 		}
1779 
1780 		err = flush_imsg(ibuf);
1781 		if (err)
1782 			break;
1783 
1784 		offset += n;
1785 		remain -= n;
1786 	}
1787 
1788 	return err;
1789 }
1790 
1791 const struct got_error *
1792 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1793 {
1794 	const struct got_error *err = NULL;
1795 	struct got_imsg_tag_object *itag;
1796 	uint8_t *buf;
1797 	size_t len, total;
1798 	size_t tag_len = strlen(tag->tag);
1799 	size_t tagger_len = strlen(tag->tagger);
1800 	size_t tagmsg_len = strlen(tag->tagmsg);
1801 
1802 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1803 
1804 	buf = malloc(total);
1805 	if (buf == NULL)
1806 		return got_error_from_errno("malloc");
1807 
1808 	itag = (struct got_imsg_tag_object *)buf;
1809 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1810 	itag->obj_type = tag->obj_type;
1811 	itag->tag_len = tag_len;
1812 	itag->tagger_len = tagger_len;
1813 	itag->tagger_time = tag->tagger_time;
1814 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1815 	itag->tagmsg_len = tagmsg_len;
1816 
1817 	len = sizeof(*itag);
1818 	memcpy(buf + len, tag->tag, tag_len);
1819 	len += tag_len;
1820 	memcpy(buf + len, tag->tagger, tagger_len);
1821 	len += tagger_len;
1822 
1823 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1824 		err = got_error_from_errno("imsg_compose TAG");
1825 		goto done;
1826 	}
1827 
1828 	if (tagmsg_len == 0 ||
1829 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1830 		err = flush_imsg(ibuf);
1831 		if (err)
1832 			goto done;
1833 	}
1834 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1835 done:
1836 	free(buf);
1837 	return err;
1838 }
1839 
1840 const struct got_error *
1841 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1842 {
1843 	const struct got_error *err = NULL;
1844 	struct imsg imsg;
1845 	struct got_imsg_tag_object *itag;
1846 	size_t len, datalen;
1847 	const size_t min_datalen =
1848 	    MIN(sizeof(struct got_imsg_error),
1849 	    sizeof(struct got_imsg_tag_object));
1850 
1851 	*tag = NULL;
1852 
1853 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1854 	if (err)
1855 		return err;
1856 
1857 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1858 	len = 0;
1859 
1860 	switch (imsg.hdr.type) {
1861 	case GOT_IMSG_TAG:
1862 		if (datalen < sizeof(*itag)) {
1863 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1864 			break;
1865 		}
1866 		itag = imsg.data;
1867 		if (datalen != sizeof(*itag) + itag->tag_len +
1868 		    itag->tagger_len) {
1869 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1870 			break;
1871 		}
1872 		len += sizeof(*itag);
1873 
1874 		*tag = calloc(1, sizeof(**tag));
1875 		if (*tag == NULL) {
1876 			err = got_error_from_errno("calloc");
1877 			break;
1878 		}
1879 
1880 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1881 
1882 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1883 		if ((*tag)->tag == NULL) {
1884 			err = got_error_from_errno("strndup");
1885 			break;
1886 		}
1887 		len += itag->tag_len;
1888 
1889 		(*tag)->obj_type = itag->obj_type;
1890 		(*tag)->tagger_time = itag->tagger_time;
1891 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1892 
1893 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1894 		if ((*tag)->tagger == NULL) {
1895 			err = got_error_from_errno("strndup");
1896 			break;
1897 		}
1898 		len += itag->tagger_len;
1899 
1900 		if (itag->tagmsg_len == 0) {
1901 			(*tag)->tagmsg = strdup("");
1902 			if ((*tag)->tagmsg == NULL) {
1903 				err = got_error_from_errno("strdup");
1904 				break;
1905 			}
1906 		} else {
1907 			size_t offset = 0, remain = itag->tagmsg_len;
1908 
1909 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1910 			if ((*tag)->tagmsg == NULL) {
1911 				err = got_error_from_errno("malloc");
1912 				break;
1913 			}
1914 			while (remain > 0) {
1915 				struct imsg imsg_log;
1916 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1917 				    remain);
1918 
1919 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1920 				if (err)
1921 					return err;
1922 
1923 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1924 					return got_error(GOT_ERR_PRIVSEP_MSG);
1925 
1926 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1927 				    n);
1928 				imsg_free(&imsg_log);
1929 				offset += n;
1930 				remain -= n;
1931 			}
1932 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1933 		}
1934 
1935 		break;
1936 	default:
1937 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1938 		break;
1939 	}
1940 
1941 	imsg_free(&imsg);
1942 
1943 	return err;
1944 }
1945 
1946 const struct got_error *
1947 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1948     struct got_packidx *packidx)
1949 {
1950 	const struct got_error *err = NULL;
1951 	struct got_imsg_packidx ipackidx;
1952 	struct got_imsg_pack ipack;
1953 	int fd;
1954 
1955 	ipackidx.len = packidx->len;
1956 	ipackidx.packfile_size = pack->filesize;
1957 	fd = dup(packidx->fd);
1958 	if (fd == -1)
1959 		return got_error_from_errno("dup");
1960 
1961 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1962 	    sizeof(ipackidx)) == -1) {
1963 		err = got_error_from_errno("imsg_compose PACKIDX");
1964 		close(fd);
1965 		return err;
1966 	}
1967 
1968 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1969 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1970 		return got_error(GOT_ERR_NO_SPACE);
1971 	ipack.filesize = pack->filesize;
1972 
1973 	fd = dup(pack->fd);
1974 	if (fd == -1)
1975 		return got_error_from_errno("dup");
1976 
1977 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1978 	    == -1) {
1979 		err = got_error_from_errno("imsg_compose PACK");
1980 		close(fd);
1981 		return err;
1982 	}
1983 
1984 	return flush_imsg(ibuf);
1985 }
1986 
1987 const struct got_error *
1988 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1989     struct got_object_id *id)
1990 {
1991 	struct got_imsg_packed_object iobj;
1992 
1993 	iobj.idx = idx;
1994 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1995 
1996 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1997 	    &iobj, sizeof(iobj)) == -1)
1998 		return got_error_from_errno("imsg_compose "
1999 		    "PACKED_OBJECT_REQUEST");
2000 
2001 	return flush_imsg(ibuf);
2002 }
2003 
2004 const struct got_error *
2005 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2006     struct got_object_id *id)
2007 {
2008 	struct got_imsg_packed_object iobj;
2009 
2010 	iobj.idx = idx;
2011 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2012 
2013 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2014 	    &iobj, sizeof(iobj)) == -1)
2015 		return got_error_from_errno("imsg_compose "
2016 		    "PACKED_OBJECT_REQUEST");
2017 
2018 	return flush_imsg(ibuf);
2019 }
2020 
2021 const struct got_error *
2022 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2023 {
2024 	const struct got_error *err = NULL;
2025 
2026 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2027 	    NULL, 0) == -1) {
2028 		err = got_error_from_errno("imsg_compose "
2029 		    "GITCONFIG_PARSE_REQUEST");
2030 		close(fd);
2031 		return err;
2032 	}
2033 
2034 	return flush_imsg(ibuf);
2035 }
2036 
2037 const struct got_error *
2038 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2039 {
2040 	if (imsg_compose(ibuf,
2041 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2042 	    NULL, 0) == -1)
2043 		return got_error_from_errno("imsg_compose "
2044 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2045 
2046 	return flush_imsg(ibuf);
2047 }
2048 
2049 const struct got_error *
2050 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2051 {
2052 	if (imsg_compose(ibuf,
2053 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2054 	    NULL, 0) == -1)
2055 		return got_error_from_errno("imsg_compose "
2056 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2057 
2058 	return flush_imsg(ibuf);
2059 }
2060 
2061 
2062 const struct got_error *
2063 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2064 {
2065 	if (imsg_compose(ibuf,
2066 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2067 		return got_error_from_errno("imsg_compose "
2068 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2069 
2070 	return flush_imsg(ibuf);
2071 }
2072 
2073 const struct got_error *
2074 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2075 {
2076 	if (imsg_compose(ibuf,
2077 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2078 		return got_error_from_errno("imsg_compose "
2079 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2080 
2081 	return flush_imsg(ibuf);
2082 }
2083 
2084 const struct got_error *
2085 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2086 {
2087 	if (imsg_compose(ibuf,
2088 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2089 		return got_error_from_errno("imsg_compose "
2090 		    "GITCONFIG_REMOTE_REQUEST");
2091 
2092 	return flush_imsg(ibuf);
2093 }
2094 
2095 const struct got_error *
2096 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2097 {
2098 	if (imsg_compose(ibuf,
2099 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2100 		return got_error_from_errno("imsg_compose "
2101 		    "GITCONFIG_OWNER_REQUEST");
2102 
2103 	return flush_imsg(ibuf);
2104 }
2105 
2106 const struct got_error *
2107 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2108 {
2109 	const struct got_error *err = NULL;
2110 	struct imsg imsg;
2111 	size_t datalen;
2112 
2113 	*str = NULL;
2114 
2115 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2116 	if (err)
2117 		return err;
2118 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2119 
2120 	switch (imsg.hdr.type) {
2121 	case GOT_IMSG_GITCONFIG_STR_VAL:
2122 		if (datalen == 0)
2123 			break;
2124 		/* datalen does not include terminating \0 */
2125 		*str = malloc(datalen + 1);
2126 		if (*str == NULL) {
2127 			err = got_error_from_errno("malloc");
2128 			break;
2129 		}
2130 		memcpy(*str, imsg.data, datalen);
2131 		(*str)[datalen] = '\0';
2132 		break;
2133 	default:
2134 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2135 		break;
2136 	}
2137 
2138 	imsg_free(&imsg);
2139 	return err;
2140 }
2141 
2142 const struct got_error *
2143 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2144 {
2145 	const struct got_error *err = NULL;
2146 	struct imsg imsg;
2147 	size_t datalen;
2148 	const size_t min_datalen =
2149 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2150 
2151 	*val = 0;
2152 
2153 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2154 	if (err)
2155 		return err;
2156 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2157 
2158 	switch (imsg.hdr.type) {
2159 	case GOT_IMSG_GITCONFIG_INT_VAL:
2160 		if (datalen != sizeof(*val)) {
2161 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2162 			break;
2163 		}
2164 		memcpy(val, imsg.data, sizeof(*val));
2165 		break;
2166 	default:
2167 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2168 		break;
2169 	}
2170 
2171 	imsg_free(&imsg);
2172 	return err;
2173 }
2174 
2175 static void
2176 free_remote_data(struct got_remote_repo *remote)
2177 {
2178 	int i;
2179 
2180 	free(remote->name);
2181 	free(remote->fetch_url);
2182 	free(remote->send_url);
2183 	for (i = 0; i < remote->nfetch_branches; i++)
2184 		free(remote->fetch_branches[i]);
2185 	free(remote->fetch_branches);
2186 	for (i = 0; i < remote->nsend_branches; i++)
2187 		free(remote->send_branches[i]);
2188 	free(remote->send_branches);
2189 	for (i = 0; i < remote->nfetch_refs; i++)
2190 		free(remote->fetch_refs[i]);
2191 	free(remote->fetch_refs);
2192 }
2193 
2194 const struct got_error *
2195 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2196     int *nremotes, struct imsgbuf *ibuf)
2197 {
2198 	const struct got_error *err = NULL;
2199 	struct imsg imsg;
2200 	size_t datalen;
2201 	struct got_imsg_remotes iremotes;
2202 	struct got_imsg_remote iremote;
2203 
2204 	*remotes = NULL;
2205 	*nremotes = 0;
2206 	iremotes.nremotes = 0;
2207 
2208 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2209 	if (err)
2210 		return err;
2211 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2212 
2213 	switch (imsg.hdr.type) {
2214 	case GOT_IMSG_GITCONFIG_REMOTES:
2215 		if (datalen != sizeof(iremotes)) {
2216 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2217 			break;
2218 		}
2219 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2220 		if (iremotes.nremotes == 0) {
2221 			imsg_free(&imsg);
2222 			return NULL;
2223 		}
2224 		break;
2225 	default:
2226 		imsg_free(&imsg);
2227 		return got_error(GOT_ERR_PRIVSEP_MSG);
2228 	}
2229 
2230 	imsg_free(&imsg);
2231 
2232 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2233 	if (*remotes == NULL)
2234 		return got_error_from_errno("recallocarray");
2235 
2236 	while (*nremotes < iremotes.nremotes) {
2237 		struct got_remote_repo *remote;
2238 
2239 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2240 		if (err)
2241 			break;
2242 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2243 
2244 		switch (imsg.hdr.type) {
2245 		case GOT_IMSG_GITCONFIG_REMOTE:
2246 			remote = &(*remotes)[*nremotes];
2247 			memset(remote, 0, sizeof(*remote));
2248 			if (datalen < sizeof(iremote)) {
2249 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2250 				break;
2251 			}
2252 			memcpy(&iremote, imsg.data, sizeof(iremote));
2253 			if (iremote.name_len == 0 ||
2254 			    iremote.fetch_url_len == 0 ||
2255 			    iremote.send_url_len == 0 ||
2256 			    (sizeof(iremote) + iremote.name_len +
2257 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2258 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2259 				break;
2260 			}
2261 			remote->name = strndup(imsg.data + sizeof(iremote),
2262 			    iremote.name_len);
2263 			if (remote->name == NULL) {
2264 				err = got_error_from_errno("strndup");
2265 				break;
2266 			}
2267 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2268 			    iremote.name_len, iremote.fetch_url_len);
2269 			if (remote->fetch_url == NULL) {
2270 				err = got_error_from_errno("strndup");
2271 				free_remote_data(remote);
2272 				break;
2273 			}
2274 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2275 			    iremote.name_len + iremote.fetch_url_len,
2276 			    iremote.send_url_len);
2277 			if (remote->send_url == NULL) {
2278 				err = got_error_from_errno("strndup");
2279 				free_remote_data(remote);
2280 				break;
2281 			}
2282 			remote->mirror_references = iremote.mirror_references;
2283 			remote->fetch_all_branches = iremote.fetch_all_branches;
2284 			remote->nfetch_branches = 0;
2285 			remote->fetch_branches = NULL;
2286 			remote->nsend_branches = 0;
2287 			remote->send_branches = NULL;
2288 			remote->nfetch_refs = 0;
2289 			remote->fetch_refs = NULL;
2290 			(*nremotes)++;
2291 			break;
2292 		default:
2293 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2294 			break;
2295 		}
2296 
2297 		imsg_free(&imsg);
2298 		if (err)
2299 			break;
2300 	}
2301 
2302 	if (err) {
2303 		int i;
2304 		for (i = 0; i < *nremotes; i++)
2305 			free_remote_data(&(*remotes)[i]);
2306 		free(*remotes);
2307 		*remotes = NULL;
2308 		*nremotes = 0;
2309 	}
2310 	return err;
2311 }
2312 
2313 const struct got_error *
2314 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2315 {
2316 	const struct got_error *err = NULL;
2317 
2318 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2319 	    NULL, 0) == -1) {
2320 		err = got_error_from_errno("imsg_compose "
2321 		    "GOTCONFIG_PARSE_REQUEST");
2322 		close(fd);
2323 		return err;
2324 	}
2325 
2326 	return flush_imsg(ibuf);
2327 }
2328 
2329 const struct got_error *
2330 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2331 {
2332 	if (imsg_compose(ibuf,
2333 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2334 		return got_error_from_errno("imsg_compose "
2335 		    "GOTCONFIG_AUTHOR_REQUEST");
2336 
2337 	return flush_imsg(ibuf);
2338 }
2339 
2340 const struct got_error *
2341 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2342 {
2343 	if (imsg_compose(ibuf,
2344 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2345 		return got_error_from_errno("imsg_compose "
2346 		    "GOTCONFIG_REMOTE_REQUEST");
2347 
2348 	return flush_imsg(ibuf);
2349 }
2350 
2351 const struct got_error *
2352 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2353 {
2354 	const struct got_error *err = NULL;
2355 	struct imsg imsg;
2356 	size_t datalen;
2357 
2358 	*str = NULL;
2359 
2360 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2361 	if (err)
2362 		return err;
2363 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2364 
2365 	switch (imsg.hdr.type) {
2366 	case GOT_IMSG_ERROR:
2367 		err = recv_imsg_error(&imsg, datalen);
2368 		break;
2369 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2370 		if (datalen == 0)
2371 			break;
2372 		/* datalen does not include terminating \0 */
2373 		*str = malloc(datalen + 1);
2374 		if (*str == NULL) {
2375 			err = got_error_from_errno("malloc");
2376 			break;
2377 		}
2378 		memcpy(*str, imsg.data, datalen);
2379 		(*str)[datalen] = '\0';
2380 		break;
2381 	default:
2382 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2383 		break;
2384 	}
2385 
2386 	imsg_free(&imsg);
2387 	return err;
2388 }
2389 
2390 const struct got_error *
2391 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2392     int *nremotes, struct imsgbuf *ibuf)
2393 {
2394 	const struct got_error *err = NULL;
2395 	struct imsg imsg;
2396 	size_t datalen;
2397 	struct got_imsg_remotes iremotes;
2398 	struct got_imsg_remote iremote;
2399 	const size_t min_datalen =
2400 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2401 
2402 	*remotes = NULL;
2403 	*nremotes = 0;
2404 	iremotes.nremotes = 0;
2405 
2406 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2407 	if (err)
2408 		return err;
2409 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2410 
2411 	switch (imsg.hdr.type) {
2412 	case GOT_IMSG_ERROR:
2413 		err = recv_imsg_error(&imsg, datalen);
2414 		break;
2415 	case GOT_IMSG_GOTCONFIG_REMOTES:
2416 		if (datalen != sizeof(iremotes)) {
2417 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2418 			break;
2419 		}
2420 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2421 		if (iremotes.nremotes == 0) {
2422 			imsg_free(&imsg);
2423 			return NULL;
2424 		}
2425 		break;
2426 	default:
2427 		imsg_free(&imsg);
2428 		return got_error(GOT_ERR_PRIVSEP_MSG);
2429 	}
2430 
2431 	imsg_free(&imsg);
2432 
2433 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2434 	if (*remotes == NULL)
2435 		return got_error_from_errno("recallocarray");
2436 
2437 	while (*nremotes < iremotes.nremotes) {
2438 		struct got_remote_repo *remote;
2439 		const size_t min_datalen =
2440 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2441 		int i;
2442 
2443 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2444 		if (err)
2445 			break;
2446 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2447 
2448 		switch (imsg.hdr.type) {
2449 		case GOT_IMSG_ERROR:
2450 			err = recv_imsg_error(&imsg, datalen);
2451 			break;
2452 		case GOT_IMSG_GOTCONFIG_REMOTE:
2453 			remote = &(*remotes)[*nremotes];
2454 			memset(remote, 0, sizeof(*remote));
2455 			if (datalen < sizeof(iremote)) {
2456 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2457 				break;
2458 			}
2459 			memcpy(&iremote, imsg.data, sizeof(iremote));
2460 			if (iremote.name_len == 0 ||
2461 			    (iremote.fetch_url_len == 0 &&
2462 			    iremote.send_url_len == 0) ||
2463 			    (sizeof(iremote) + iremote.name_len +
2464 			    iremote.fetch_url_len + iremote.send_url_len) >
2465 			    datalen) {
2466 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2467 				break;
2468 			}
2469 			remote->name = strndup(imsg.data + sizeof(iremote),
2470 			    iremote.name_len);
2471 			if (remote->name == NULL) {
2472 				err = got_error_from_errno("strndup");
2473 				break;
2474 			}
2475 			remote->fetch_url = strndup(imsg.data +
2476 			    sizeof(iremote) + iremote.name_len,
2477 			    iremote.fetch_url_len);
2478 			if (remote->fetch_url == NULL) {
2479 				err = got_error_from_errno("strndup");
2480 				free_remote_data(remote);
2481 				break;
2482 			}
2483 			remote->send_url = strndup(imsg.data +
2484 			    sizeof(iremote) + iremote.name_len +
2485 			    iremote.fetch_url_len, iremote.send_url_len);
2486 			if (remote->send_url == NULL) {
2487 				err = got_error_from_errno("strndup");
2488 				free_remote_data(remote);
2489 				break;
2490 			}
2491 			remote->mirror_references = iremote.mirror_references;
2492 			remote->fetch_all_branches = iremote.fetch_all_branches;
2493 			if (iremote.nfetch_branches > 0) {
2494 				remote->fetch_branches = recallocarray(NULL, 0,
2495 				    iremote.nfetch_branches, sizeof(char *));
2496 				if (remote->fetch_branches == NULL) {
2497 					err = got_error_from_errno("calloc");
2498 					free_remote_data(remote);
2499 					break;
2500 				}
2501 			}
2502 			remote->nfetch_branches = 0;
2503 			for (i = 0; i < iremote.nfetch_branches; i++) {
2504 				char *branch;
2505 				err = got_privsep_recv_gotconfig_str(&branch,
2506 				    ibuf);
2507 				if (err) {
2508 					free_remote_data(remote);
2509 					goto done;
2510 				}
2511 				remote->fetch_branches[i] = branch;
2512 				remote->nfetch_branches++;
2513 			}
2514 			if (iremote.nsend_branches > 0) {
2515 				remote->send_branches = recallocarray(NULL, 0,
2516 				    iremote.nsend_branches, sizeof(char *));
2517 				if (remote->send_branches == NULL) {
2518 					err = got_error_from_errno("calloc");
2519 					free_remote_data(remote);
2520 					break;
2521 				}
2522 			}
2523 			remote->nsend_branches = 0;
2524 			for (i = 0; i < iremote.nsend_branches; i++) {
2525 				char *branch;
2526 				err = got_privsep_recv_gotconfig_str(&branch,
2527 				    ibuf);
2528 				if (err) {
2529 					free_remote_data(remote);
2530 					goto done;
2531 				}
2532 				remote->send_branches[i] = branch;
2533 				remote->nsend_branches++;
2534 			}
2535 			if (iremote.nfetch_refs > 0) {
2536 				remote->fetch_refs = recallocarray(NULL, 0,
2537 				    iremote.nfetch_refs, sizeof(char *));
2538 				if (remote->fetch_refs == NULL) {
2539 					err = got_error_from_errno("calloc");
2540 					free_remote_data(remote);
2541 					break;
2542 				}
2543 			}
2544 			remote->nfetch_refs = 0;
2545 			for (i = 0; i < iremote.nfetch_refs; i++) {
2546 				char *ref;
2547 				err = got_privsep_recv_gotconfig_str(&ref,
2548 				    ibuf);
2549 				if (err) {
2550 					free_remote_data(remote);
2551 					goto done;
2552 				}
2553 				remote->fetch_refs[i] = ref;
2554 				remote->nfetch_refs++;
2555 			}
2556 			(*nremotes)++;
2557 			break;
2558 		default:
2559 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2560 			break;
2561 		}
2562 
2563 		imsg_free(&imsg);
2564 		if (err)
2565 			break;
2566 	}
2567 done:
2568 	if (err) {
2569 		int i;
2570 		for (i = 0; i < *nremotes; i++)
2571 			free_remote_data(&(*remotes)[i]);
2572 		free(*remotes);
2573 		*remotes = NULL;
2574 		*nremotes = 0;
2575 	}
2576 	return err;
2577 }
2578 
2579 const struct got_error *
2580 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2581     struct got_object_id *id, int idx, const char *path)
2582 {
2583 	struct ibuf *wbuf;
2584 	size_t path_len = strlen(path) + 1;
2585 
2586 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2587 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2588 	if (wbuf == NULL)
2589 		return got_error_from_errno(
2590 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2591 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2592 		return got_error_from_errno("imsg_add "
2593 		    "COMMIT_TRAVERSAL_REQUEST");
2594 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2595 		return got_error_from_errno("imsg_add "
2596 		    "COMMIT_TRAVERSAL_REQUEST");
2597 	if (imsg_add(wbuf, path, path_len) == -1)
2598 		return got_error_from_errno("imsg_add "
2599 		    "COMMIT_TRAVERSAL_REQUEST");
2600 
2601 	wbuf->fd = -1;
2602 	imsg_close(ibuf, wbuf);
2603 
2604 	return flush_imsg(ibuf);
2605 }
2606 
2607 const struct got_error *
2608 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2609     struct got_object_id **changed_commit_id,
2610     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2611 {
2612 	const struct got_error *err = NULL;
2613 	struct imsg imsg;
2614 	struct got_imsg_traversed_commits *icommits;
2615 	size_t datalen;
2616 	int i, done = 0;
2617 
2618 	*changed_commit = NULL;
2619 	*changed_commit_id = NULL;
2620 
2621 	while (!done) {
2622 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2623 		if (err)
2624 			return err;
2625 
2626 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2627 		switch (imsg.hdr.type) {
2628 		case GOT_IMSG_TRAVERSED_COMMITS:
2629 			icommits = imsg.data;
2630 			if (datalen != sizeof(*icommits) +
2631 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2632 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2633 				break;
2634 			}
2635 			for (i = 0; i < icommits->ncommits; i++) {
2636 				struct got_object_qid *qid;
2637 				uint8_t *sha1 = (uint8_t *)imsg.data +
2638 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2639 				err = got_object_qid_alloc_partial(&qid);
2640 				if (err)
2641 					break;
2642 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2643 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2644 
2645 				/* The last commit may contain a change. */
2646 				if (i == icommits->ncommits - 1) {
2647 					*changed_commit_id =
2648 					    got_object_id_dup(&qid->id);
2649 					if (*changed_commit_id == NULL) {
2650 						err = got_error_from_errno(
2651 						    "got_object_id_dup");
2652 						break;
2653 					}
2654 				}
2655 			}
2656 			break;
2657 		case GOT_IMSG_COMMIT:
2658 			if (*changed_commit_id == NULL) {
2659 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2660 				break;
2661 			}
2662 			err = get_commit_from_imsg(changed_commit, &imsg,
2663 			    datalen, ibuf);
2664 			break;
2665 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2666 			done = 1;
2667 			break;
2668 		default:
2669 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2670 			break;
2671 		}
2672 
2673 		imsg_free(&imsg);
2674 		if (err)
2675 			break;
2676 	}
2677 
2678 	if (err)
2679 		got_object_id_queue_free(commit_ids);
2680 	return err;
2681 }
2682 
2683 const struct got_error *
2684 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2685     struct got_object_id *tree_id, const char *path,
2686     struct got_parsed_tree_entry *entries, int nentries)
2687 {
2688 	const struct got_error *err = NULL;
2689 	struct ibuf *wbuf;
2690 	size_t path_len = strlen(path);
2691 	size_t msglen;
2692 
2693 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2694 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2695 	if (wbuf == NULL)
2696 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2697 
2698 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2699 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2700 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2701 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2702 	if (imsg_add(wbuf, path, path_len) == -1)
2703 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2704 
2705 	wbuf->fd = -1;
2706 	imsg_close(ibuf, wbuf);
2707 
2708 	if (entries) {
2709 		err = send_tree_entries(ibuf, entries, nentries);
2710 		if (err)
2711 			return err;
2712 	}
2713 
2714 	return flush_imsg(ibuf);
2715 }
2716 
2717 const struct got_error *
2718 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2719 {
2720 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2721 	    0, 0, -1, NULL, 0) == -1)
2722 		return got_error_from_errno("imsg_compose "
2723 		    "OBJECT_ENUMERATION_REQUEST");
2724 
2725 	return flush_imsg(ibuf);
2726 }
2727 
2728 const struct got_error *
2729 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2730 {
2731 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2732 	    0, 0, -1, NULL, 0) == -1)
2733 		return got_error_from_errno("imsg_compose "
2734 		    "OBJECT_ENUMERATION_DONE");
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(struct imsgbuf *ibuf,
2764     got_object_enumerate_commit_cb cb_commit,
2765     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2766     struct got_repository *repo)
2767 {
2768 	const struct got_error *err = NULL;
2769 	struct imsg imsg;
2770 	struct got_imsg_enumerated_commit *icommit = NULL;
2771 	struct got_object_id commit_id;
2772 	int have_commit = 0;
2773 	time_t mtime = 0;
2774 	struct got_tree_object tree;
2775 	struct got_imsg_enumerated_tree *itree;
2776 	struct got_object_id tree_id;
2777 	char *path = NULL, *canon_path = NULL;
2778 	size_t datalen, path_len;
2779 	int nentries = -1;
2780 	int done = 0;
2781 
2782 	memset(&tree, 0, sizeof(tree));
2783 
2784 	while (!done) {
2785 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2786 		if (err)
2787 			break;
2788 
2789 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2790 		switch (imsg.hdr.type) {
2791 		case GOT_IMSG_ENUMERATED_COMMIT: 
2792 			if (have_commit && nentries != -1) {
2793 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2794 				break;
2795 			}
2796 			if (datalen != sizeof(*icommit)) {
2797 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2798 				break;
2799 			}
2800 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2801 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2802 			mtime = icommit->mtime;
2803 			have_commit = 1;
2804 			break;
2805 		case GOT_IMSG_ENUMERATED_TREE:
2806 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2807 			if (!have_commit) {
2808 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2809 				break;
2810 			}
2811 			if (datalen < sizeof(*itree)) {
2812 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2813 				break;
2814 			}
2815 			itree = imsg.data;
2816 			path_len = datalen - sizeof(*itree);
2817 			if (path_len == 0) {
2818 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2819 				break;
2820 			}
2821 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2822 			free(path);
2823 			path = malloc(path_len + 1);
2824 			if (path == NULL) {
2825 				err = got_error_from_errno("malloc");
2826 				break;
2827 			}
2828 			free(canon_path);
2829 			canon_path = malloc(path_len + 1);
2830 			if (canon_path == NULL) {
2831 				err = got_error_from_errno("malloc");
2832 				break;
2833 			}
2834 			memcpy(path, (uint8_t *)imsg.data + sizeof(*itree),
2835 			    path_len);
2836 			path[path_len] = '\0';
2837 			if (!got_path_is_absolute(path)) {
2838 				err = got_error(GOT_ERR_BAD_PATH);
2839 				break;
2840 			}
2841 			if (got_path_is_root_dir(path)) {
2842 				/* XXX check what got_canonpath() does wrong */
2843 				canon_path[0] = '/';
2844 				canon_path[1] = '\0';
2845 			} else {
2846 				err = got_canonpath(path, canon_path,
2847 				    path_len + 1);
2848 				if (err)
2849 					break;
2850 			}
2851 			if (strcmp(path, canon_path) != 0) {
2852 				err = got_error(GOT_ERR_BAD_PATH);
2853 				break;
2854 			}
2855 			if (nentries != -1) {
2856 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2857 				break;
2858 			}
2859 			if (itree->nentries < -1) {
2860 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2861 				break;
2862 			}
2863 			if (itree->nentries == -1) {
2864 				/* Tree was not found in pack file. */
2865 				done = 1;
2866 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2867 				    path, repo);
2868 				break;
2869 			}
2870 			if (itree->nentries > INT_MAX) {
2871 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2872 				break;
2873 			}
2874 			tree.entries = calloc(itree->nentries,
2875 			    sizeof(struct got_tree_entry));
2876 			if (tree.entries == NULL) {
2877 				err = got_error_from_errno("calloc");
2878 				break;
2879 			}
2880 			if (itree->nentries == 0) {
2881 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2882 				    path, repo);
2883 				if (err)
2884 					break;
2885 
2886 				/* Prepare for next tree. */
2887 				free(tree.entries);
2888 				memset(&tree, 0, sizeof(tree));
2889 				nentries = -1;
2890 			} else {
2891 				tree.nentries = itree->nentries;
2892 				nentries = 0;
2893 			}
2894 			break;
2895 		case GOT_IMSG_TREE_ENTRIES:
2896 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2897 			if (nentries <= -1) {
2898 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2899 				break;
2900 			}
2901 			err = recv_tree_entries(imsg.data, datalen,
2902 			    &tree, &nentries);
2903 			if (err)
2904 				break;
2905 			if (tree.nentries == nentries) {
2906 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2907 				    path, repo);
2908 				if (err)
2909 					break;
2910 
2911 				/* Prepare for next tree. */
2912 				free(tree.entries);
2913 				memset(&tree, 0, sizeof(tree));
2914 				nentries = -1;
2915 			}
2916 			break;
2917 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2918 			/* All trees have been found and traversed. */
2919 			if (!have_commit || path == NULL || nentries != -1) {
2920 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2921 				break;
2922 			}
2923 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2924 			if (err)
2925 				break;
2926 			have_commit = 0;
2927 			break;
2928 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2929 			done = 1;
2930 			break;
2931 		default:
2932 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2933 			break;
2934 		}
2935 
2936 		imsg_free(&imsg);
2937 		if (err)
2938 			break;
2939 	}
2940 
2941 	free(path);
2942 	free(canon_path);
2943 	free(tree.entries);
2944 	return err;
2945 }
2946 
2947 const struct got_error *
2948 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2949     struct got_object_id *id)
2950 {
2951 	struct got_imsg_raw_delta_request dreq;
2952 
2953 	dreq.idx = idx;
2954 	memcpy(dreq.id, id->sha1, SHA1_DIGEST_LENGTH);
2955 
2956 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
2957 	    &dreq, sizeof(dreq)) == -1)
2958 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
2959 
2960 	return flush_imsg(ibuf);
2961 }
2962 
2963 const struct got_error *
2964 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
2965 {
2966 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
2967 }
2968 
2969 const struct got_error *
2970 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
2971     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
2972     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
2973 {
2974 	struct got_imsg_raw_delta idelta;
2975 	int ret;
2976 
2977 	idelta.base_size = base_size;
2978 	idelta.result_size = result_size;
2979 	idelta.delta_size = delta_size;
2980 	idelta.delta_compressed_size = delta_compressed_size;
2981 	idelta.delta_offset = delta_offset;
2982 	idelta.delta_out_offset = delta_out_offset;
2983 	memcpy(idelta.base_id, base_id->sha1, SHA1_DIGEST_LENGTH);
2984 
2985 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
2986 	    &idelta, sizeof(idelta));
2987 	if (ret == -1)
2988 		return got_error_from_errno("imsg_compose RAW_DELTA");
2989 
2990 	return flush_imsg(ibuf);
2991 }
2992 
2993 const struct got_error *
2994 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
2995     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
2996     off_t *delta_out_offset, struct got_object_id **base_id, struct imsgbuf *ibuf)
2997 {
2998 	const struct got_error *err = NULL;
2999 	struct imsg imsg;
3000 	struct got_imsg_raw_delta *delta;
3001 	size_t datalen;
3002 
3003 	*base_size = 0;
3004 	*result_size = 0;
3005 	*delta_size = 0;
3006 	*delta_compressed_size = 0;
3007 	*delta_offset = 0;
3008 	*delta_out_offset = 0;
3009 	*base_id = NULL;
3010 
3011 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3012 	if (err)
3013 		return err;
3014 
3015 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3016 
3017 	switch (imsg.hdr.type) {
3018 	case GOT_IMSG_RAW_DELTA:
3019 		if (datalen != sizeof(*delta)) {
3020 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3021 			break;
3022 		}
3023 		delta = imsg.data;
3024 		*base_size = delta->base_size;
3025 		*result_size = delta->result_size;
3026 		*delta_size = delta->delta_size;
3027 		*delta_compressed_size = delta->delta_compressed_size;
3028 		*delta_offset = delta->delta_offset;
3029 		*delta_out_offset = delta->delta_out_offset;
3030 		*base_id = calloc(1, sizeof(**base_id));
3031 		if (*base_id == NULL) {
3032 			err = got_error_from_errno("malloc");
3033 			break;
3034 		}
3035 		memcpy((*base_id)->sha1, delta->base_id, SHA1_DIGEST_LENGTH);
3036 		break;
3037 	default:
3038 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3039 		break;
3040 	}
3041 
3042 	imsg_free(&imsg);
3043 
3044 	if (err) {
3045 		free(*base_id);
3046 		*base_id = NULL;
3047 	}
3048 	return err;
3049 }
3050 
3051 static const struct got_error *
3052 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3053 {
3054 	const struct got_error *err = NULL;
3055 	struct got_imsg_object_idlist idlist;
3056 	struct ibuf *wbuf;
3057 	size_t i;
3058 
3059 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3060 		return got_error(GOT_ERR_NO_SPACE);
3061 
3062 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3063 	    sizeof(idlist) + nids * sizeof(**ids));
3064 	if (wbuf == NULL) {
3065 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3066 		return err;
3067 	}
3068 
3069 	idlist.nids = nids;
3070 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3071 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3072 
3073 	for (i = 0; i < nids; i++) {
3074 		struct got_object_id *id = ids[i];
3075 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3076 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3077 	}
3078 	
3079 	wbuf->fd = -1;
3080 	imsg_close(ibuf, wbuf);
3081 
3082 	return flush_imsg(ibuf);
3083 }
3084 
3085 const struct got_error *
3086 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3087     struct got_object_id **ids, size_t nids)
3088 {
3089 	const struct got_error *err = NULL;
3090 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3091 	int i, j = 0;
3092 
3093 	for (i = 0; i < nids; i++) { 
3094 		j = i % nitems(idlist);
3095 		idlist[j] = ids[i];
3096 		if (j >= nitems(idlist) - 1) {
3097 			err = send_idlist(ibuf, idlist, j + 1);
3098 			if (err)
3099 				return err;
3100 			j = 0;
3101 		}
3102 	}
3103 
3104 	if (j > 0) {
3105 		err = send_idlist(ibuf, idlist, j + 1);
3106 		if (err)
3107 			return err;
3108 	}
3109 
3110 	return NULL;
3111 }
3112 
3113 const struct got_error *
3114 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3115 {
3116 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3117 	    == -1)
3118 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3119 
3120 	return flush_imsg(ibuf);
3121 }
3122 
3123 const struct got_error *
3124 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3125     size_t *nids, struct imsgbuf *ibuf)
3126 {
3127 	const struct got_error *err = NULL;
3128 	struct imsg imsg;
3129 	struct got_imsg_object_idlist *idlist;
3130 	size_t datalen;
3131 
3132 	*ids = NULL;
3133 	*done = 0;
3134 	*nids = 0;
3135 
3136 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3137 	if (err)
3138 		return err;
3139 
3140 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3141 	switch (imsg.hdr.type) {
3142 	case GOT_IMSG_OBJ_ID_LIST:
3143 		if (datalen < sizeof(*idlist)) {
3144 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3145 			break;
3146 		}
3147 		idlist = imsg.data;
3148 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
3149 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3150 			break;
3151 		}
3152 		*nids = idlist->nids;
3153 		*ids = calloc(*nids, sizeof(**ids));
3154 		if (*ids == NULL) {
3155 			err = got_error_from_errno("calloc");
3156 			break;
3157 		}
3158 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(idlist),
3159 		    *nids * sizeof(**ids));
3160 		break;
3161 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3162 		*done = 1;
3163 		break;
3164 	default:
3165 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3166 		break;
3167 	}
3168 
3169 	imsg_free(&imsg);
3170 
3171 	return err;
3172 }
3173 
3174 const struct got_error *
3175 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3176 {
3177 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3178 	    == -1)
3179 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3180 
3181 	return flush_imsg(ibuf);
3182 }
3183 
3184 const struct got_error *
3185 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3186     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3187 {
3188 	const struct got_error *err = NULL;
3189 	struct ibuf *wbuf;
3190 	struct got_imsg_reused_deltas ideltas;
3191 	size_t i;
3192 
3193 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3194 		return got_error(GOT_ERR_NO_SPACE);
3195 
3196 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3197 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3198 	if (wbuf == NULL) {
3199 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3200 		return err;
3201 	}
3202 
3203 	ideltas.ndeltas = ndeltas;
3204 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3205 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3206 
3207 	for (i = 0; i < ndeltas; i++) {
3208 		struct got_imsg_reused_delta *delta = &deltas[i];
3209 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3210 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3211 	}
3212 	
3213 	wbuf->fd = -1;
3214 	imsg_close(ibuf, wbuf);
3215 
3216 	return flush_imsg(ibuf);
3217 }
3218 
3219 const struct got_error *
3220 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3221 {
3222 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3223 	    == -1)
3224 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3225 
3226 	return flush_imsg(ibuf);
3227 }
3228 
3229 const struct got_error *
3230 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3231     size_t *ndeltas, struct imsgbuf *ibuf)
3232 {
3233 	const struct got_error *err = NULL;
3234 	struct imsg imsg;
3235 	struct got_imsg_reused_deltas *ideltas;
3236 	size_t datalen;
3237 
3238 	*done = 0;
3239 	*ndeltas = 0;
3240 
3241 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3242 	if (err)
3243 		return err;
3244 
3245 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3246 	switch (imsg.hdr.type) {
3247 	case GOT_IMSG_REUSED_DELTAS:
3248 		if (datalen < sizeof(*ideltas)) {
3249 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3250 			break;
3251 		}
3252 		ideltas = imsg.data;
3253 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
3254 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3255 			break;
3256 		}
3257 		*ndeltas = ideltas->ndeltas;
3258 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(ideltas),
3259 		    *ndeltas * sizeof(*deltas));
3260 		break;
3261 	case GOT_IMSG_DELTA_REUSE_DONE:
3262 		*done = 1;
3263 		break;
3264 	default:
3265 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3266 		break;
3267 	}
3268 
3269 	imsg_free(&imsg);
3270 
3271 	return err;
3272 }
3273 
3274 const struct got_error *
3275 got_privsep_unveil_exec_helpers(void)
3276 {
3277 	const char *helpers[] = {
3278 	    GOT_PATH_PROG_READ_PACK,
3279 	    GOT_PATH_PROG_READ_OBJECT,
3280 	    GOT_PATH_PROG_READ_COMMIT,
3281 	    GOT_PATH_PROG_READ_TREE,
3282 	    GOT_PATH_PROG_READ_BLOB,
3283 	    GOT_PATH_PROG_READ_TAG,
3284 	    GOT_PATH_PROG_READ_GITCONFIG,
3285 	    GOT_PATH_PROG_READ_GOTCONFIG,
3286 	    GOT_PATH_PROG_READ_PATCH,
3287 	    GOT_PATH_PROG_FETCH_PACK,
3288 	    GOT_PATH_PROG_INDEX_PACK,
3289 	    GOT_PATH_PROG_SEND_PACK,
3290 	};
3291 	size_t i;
3292 
3293 	for (i = 0; i < nitems(helpers); i++) {
3294 		if (unveil(helpers[i], "x") == 0)
3295 			continue;
3296 		return got_error_from_errno2("unveil", helpers[i]);
3297 	}
3298 
3299 	return NULL;
3300 }
3301 
3302 void
3303 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3304 {
3305 	if (close(imsg_fds[0]) == -1) {
3306 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3307 		_exit(1);
3308 	}
3309 
3310 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3311 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3312 		_exit(1);
3313 	}
3314 
3315 	closefrom(GOT_IMSG_FD_CHILD + 1);
3316 
3317 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3318 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3319 		    strerror(errno));
3320 		_exit(1);
3321 	}
3322 }