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/uio.h>
20 #include <sys/wait.h>
21 
22 #include <ctype.h>
23 #include <limits.h>
24 #include <signal.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <stdint.h>
30 #include <poll.h>
31 #include <unistd.h>
32 #include <zlib.h>
33 #include <time.h>
34 
35 #include "got_compat.h"
36 
37 #include "got_object.h"
38 #include "got_error.h"
39 #include "got_path.h"
40 #include "got_repository.h"
41 
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49 
50 #ifndef MIN
51 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
52 #endif
53 
54 #ifndef nitems
55 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
56 #endif
57 
58 static const struct got_error *
59 poll_fd(int fd, int events, int timeout)
60 {
61 	struct pollfd pfd[1];
62 	struct timespec ts;
63 	sigset_t sigset;
64 	int n;
65 
66 	pfd[0].fd = fd;
67 	pfd[0].events = events;
68 
69 	ts.tv_sec = timeout;
70 	ts.tv_nsec = 0;
71 
72 	if (sigemptyset(&sigset) == -1)
73 		return got_error_from_errno("sigemptyset");
74 	if (sigaddset(&sigset, SIGWINCH) == -1)
75 		return got_error_from_errno("sigaddset");
76 
77 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
78 	if (n == -1)
79 		return got_error_from_errno("ppoll");
80 	if (n == 0)
81 		return got_error(GOT_ERR_TIMEOUT);
82 	if (pfd[0].revents & (POLLERR | POLLNVAL))
83 		return got_error_from_errno("poll error");
84 	if (pfd[0].revents & (events | POLLHUP))
85 		return NULL;
86 
87 	return got_error(GOT_ERR_INTERRUPT);
88 }
89 
90 static const struct got_error *
91 read_imsg(struct imsgbuf *ibuf)
92 {
93 	const struct got_error *err;
94 	size_t n;
95 
96 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
97 	if (err)
98 		return err;
99 
100 	n = imsg_read(ibuf);
101 	if (n == -1) {
102 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
103 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
104 		return got_error(GOT_ERR_PRIVSEP_READ);
105 	}
106 	if (n == 0)
107 		return got_error(GOT_ERR_PRIVSEP_PIPE);
108 
109 	return NULL;
110 }
111 
112 const struct got_error *
113 got_privsep_wait_for_child(pid_t pid)
114 {
115 	int child_status;
116 
117 	if (waitpid(pid, &child_status, 0) == -1)
118 		return got_error_from_errno("waitpid");
119 
120 	if (!WIFEXITED(child_status))
121 		return got_error(GOT_ERR_PRIVSEP_DIED);
122 
123 	if (WEXITSTATUS(child_status) != 0)
124 		return got_error(GOT_ERR_PRIVSEP_EXIT);
125 
126 	return NULL;
127 }
128 
129 static const struct got_error *
130 recv_imsg_error(struct imsg *imsg, size_t datalen)
131 {
132 	struct got_imsg_error *ierr;
133 
134 	if (datalen != sizeof(*ierr))
135 		return got_error(GOT_ERR_PRIVSEP_LEN);
136 
137 	ierr = imsg->data;
138 	if (ierr->code == GOT_ERR_ERRNO) {
139 		static struct got_error serr;
140 		serr.code = GOT_ERR_ERRNO;
141 		serr.msg = strerror(ierr->errno_code);
142 		return &serr;
143 	}
144 
145 	return got_error(ierr->code);
146 }
147 
148 const struct got_error *
149 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
150     size_t min_datalen)
151 {
152 	const struct got_error *err;
153 	ssize_t n;
154 
155 	n = imsg_get(ibuf, imsg);
156 	if (n == -1)
157 		return got_error_from_errno("imsg_get");
158 
159 	while (n == 0) {
160 		err = read_imsg(ibuf);
161 		if (err)
162 			return err;
163 		n = imsg_get(ibuf, imsg);
164 		if (n == -1)
165 			return got_error_from_errno("imsg_get");
166 	}
167 
168 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
169 		return got_error(GOT_ERR_PRIVSEP_LEN);
170 
171 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
172 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
173 		return recv_imsg_error(imsg, datalen);
174 	}
175 
176 	return NULL;
177 }
178 
179 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
180 void
181 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
182 {
183 	const struct got_error *poll_err;
184 	struct got_imsg_error ierr;
185 	int ret;
186 
187 	ierr.code = err->code;
188 	if (err->code == GOT_ERR_ERRNO)
189 		ierr.errno_code = errno;
190 	else
191 		ierr.errno_code = 0;
192 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
193 	if (ret == -1) {
194 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
195 		    getprogname(), err->code, err->msg, strerror(errno));
196 		return;
197 	}
198 
199 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
200 	if (poll_err) {
201 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
202 		    getprogname(), err->code, err->msg, poll_err->msg);
203 		return;
204 	}
205 
206 	ret = imsg_flush(ibuf);
207 	if (ret == -1) {
208 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
209 		    getprogname(), err->code, err->msg, strerror(errno));
210 		imsg_clear(ibuf);
211 		return;
212 	}
213 }
214 
215 static const struct got_error *
216 flush_imsg(struct imsgbuf *ibuf)
217 {
218 	const struct got_error *err;
219 
220 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
221 	if (err)
222 		return err;
223 
224 	if (imsg_flush(ibuf) == -1) {
225 		imsg_clear(ibuf);
226 		return got_error_from_errno("imsg_flush");
227 	}
228 
229 	return NULL;
230 }
231 
232 const struct got_error *
233 got_privsep_flush_imsg(struct imsgbuf *ibuf)
234 {
235 	return flush_imsg(ibuf);
236 }
237 
238 const struct got_error *
239 got_privsep_send_stop(int fd)
240 {
241 	const struct got_error *err = NULL;
242 	struct imsgbuf ibuf;
243 
244 	imsg_init(&ibuf, fd);
245 
246 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
247 		return got_error_from_errno("imsg_compose STOP");
248 
249 	err = flush_imsg(&ibuf);
250 	return err;
251 }
252 
253 const struct got_error *
254 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
255     struct got_object_id *id)
256 {
257 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
258 	    id, sizeof(*id)) == -1)
259 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
260 
261 	return flush_imsg(ibuf);
262 }
263 
264 const struct got_error *
265 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
266     struct got_object_id *id)
267 {
268 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
269 	    id, sizeof(*id)) == -1)
270 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
271 
272 	return flush_imsg(ibuf);
273 }
274 
275 const struct got_error *
276 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
277 {
278 	const struct got_error *err = NULL;
279 
280 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
281 	    == -1) {
282 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
283 		close(outfd);
284 		return err;
285 	}
286 
287 	return flush_imsg(ibuf);
288 }
289 
290 const struct got_error *
291 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
292     uint8_t *data)
293 {
294 	const struct got_error *err = NULL;
295 	struct got_imsg_raw_obj iobj;
296 	size_t len = sizeof(iobj);
297 	struct ibuf *wbuf;
298 
299 	iobj.hdrlen = hdrlen;
300 	iobj.size = size;
301 
302 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
303 		len += (size_t)size + hdrlen;
304 
305 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
306 	if (wbuf == NULL) {
307 		err = got_error_from_errno("imsg_create RAW_OBJECT");
308 		return err;
309 	}
310 
311 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
312 		return got_error_from_errno("imsg_add RAW_OBJECT");
313 
314 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
315 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
316 			return got_error_from_errno("imsg_add RAW_OBJECT");
317 	}
318 
319 	wbuf->fd = -1;
320 	imsg_close(ibuf, wbuf);
321 
322 	return flush_imsg(ibuf);
323 }
324 
325 const struct got_error *
326 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
327     struct imsgbuf *ibuf)
328 {
329 	const struct got_error *err = NULL;
330 	struct imsg imsg;
331 	struct got_imsg_raw_obj *iobj;
332 	size_t datalen;
333 
334 	*outbuf = NULL;
335 
336 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
337 	if (err)
338 		return err;
339 
340 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
341 
342 	switch (imsg.hdr.type) {
343 	case GOT_IMSG_RAW_OBJECT:
344 		if (datalen < sizeof(*iobj)) {
345 			err = got_error(GOT_ERR_PRIVSEP_LEN);
346 			break;
347 		}
348 		iobj = imsg.data;
349 		*size = iobj->size;
350 		*hdrlen = iobj->hdrlen;
351 
352 		if (datalen == sizeof(*iobj)) {
353 			/* Data has been written to file descriptor. */
354 			break;
355 		}
356 
357 		if (*size < 0 ||
358 		    *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 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1104 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1105 			err = got_error(GOT_ERR_RANGE);
1106 			break;
1107 		}
1108 		*nobj_total = iprogress->nobj_total;
1109 		*nobj_indexed = iprogress->nobj_indexed;
1110 		*nobj_loose = iprogress->nobj_loose;
1111 		*nobj_resolved = iprogress->nobj_resolved;
1112 		break;
1113 	case GOT_IMSG_IDXPACK_DONE:
1114 		if (datalen != 0) {
1115 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1116 			break;
1117 		}
1118 		*done = 1;
1119 		break;
1120 	default:
1121 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1122 		break;
1123 	}
1124 
1125 	imsg_free(&imsg);
1126 	return err;
1127 }
1128 
1129 const struct got_error *
1130 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1131     struct imsgbuf *ibuf)
1132 {
1133 	struct got_imsg_object *iobj;
1134 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1135 
1136 	if (datalen != sizeof(*iobj))
1137 		return got_error(GOT_ERR_PRIVSEP_LEN);
1138 	iobj = imsg->data;
1139 
1140 	if (iobj->pack_offset < 0)
1141 		return got_error(GOT_ERR_PACK_OFFSET);
1142 
1143 	*obj = calloc(1, sizeof(**obj));
1144 	if (*obj == NULL)
1145 		return got_error_from_errno("calloc");
1146 
1147 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1148 	(*obj)->type = iobj->type;
1149 	(*obj)->flags = iobj->flags;
1150 	(*obj)->hdrlen = iobj->hdrlen;
1151 	(*obj)->size = iobj->size;
1152 	/* path_packfile is handled by caller */
1153 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1154 		(*obj)->pack_offset = iobj->pack_offset;
1155 		(*obj)->pack_idx = iobj->pack_idx;
1156 	}
1157 	STAILQ_INIT(&(*obj)->deltas.entries);
1158 	return NULL;
1159 }
1160 
1161 const struct got_error *
1162 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1163 {
1164 	const struct got_error *err = NULL;
1165 	struct imsg imsg;
1166 	const size_t min_datalen =
1167 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1168 
1169 	*obj = NULL;
1170 
1171 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1172 	if (err)
1173 		return err;
1174 
1175 	switch (imsg.hdr.type) {
1176 	case GOT_IMSG_OBJECT:
1177 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1178 		break;
1179 	default:
1180 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1181 		break;
1182 	}
1183 
1184 	imsg_free(&imsg);
1185 
1186 	return err;
1187 }
1188 
1189 static const struct got_error *
1190 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1191     size_t logmsg_len)
1192 {
1193 	const struct got_error *err = NULL;
1194 	size_t offset, remain;
1195 
1196 	offset = 0;
1197 	remain = logmsg_len;
1198 	while (remain > 0) {
1199 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1200 
1201 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1202 		    commit->logmsg + offset, n) == -1) {
1203 			err = got_error_from_errno("imsg_compose "
1204 			    "COMMIT_LOGMSG");
1205 			break;
1206 		}
1207 
1208 		err = flush_imsg(ibuf);
1209 		if (err)
1210 			break;
1211 
1212 		offset += n;
1213 		remain -= n;
1214 	}
1215 
1216 	return err;
1217 }
1218 
1219 const struct got_error *
1220 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1221 {
1222 	const struct got_error *err = NULL;
1223 	struct got_imsg_commit_object *icommit;
1224 	uint8_t *buf;
1225 	size_t len, total;
1226 	struct got_object_qid *qid;
1227 	size_t author_len = strlen(commit->author);
1228 	size_t committer_len = strlen(commit->committer);
1229 	size_t logmsg_len = strlen(commit->logmsg);
1230 
1231 	total = sizeof(*icommit) + author_len + committer_len +
1232 	    commit->nparents * SHA1_DIGEST_LENGTH;
1233 
1234 	buf = malloc(total);
1235 	if (buf == NULL)
1236 		return got_error_from_errno("malloc");
1237 
1238 	icommit = (struct got_imsg_commit_object *)buf;
1239 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1240 	    sizeof(icommit->tree_id));
1241 	icommit->author_len = author_len;
1242 	icommit->author_time = commit->author_time;
1243 	icommit->author_gmtoff = commit->author_gmtoff;
1244 	icommit->committer_len = committer_len;
1245 	icommit->committer_time = commit->committer_time;
1246 	icommit->committer_gmtoff = commit->committer_gmtoff;
1247 	icommit->logmsg_len = logmsg_len;
1248 	icommit->nparents = commit->nparents;
1249 
1250 	len = sizeof(*icommit);
1251 	memcpy(buf + len, commit->author, author_len);
1252 	len += author_len;
1253 	memcpy(buf + len, commit->committer, committer_len);
1254 	len += committer_len;
1255 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1256 		memcpy(buf + len, &qid->id, SHA1_DIGEST_LENGTH);
1257 		len += SHA1_DIGEST_LENGTH;
1258 	}
1259 
1260 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1261 		err = got_error_from_errno("imsg_compose COMMIT");
1262 		goto done;
1263 	}
1264 
1265 	if (logmsg_len == 0 ||
1266 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1267 		err = flush_imsg(ibuf);
1268 		if (err)
1269 			goto done;
1270 	}
1271 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1272 done:
1273 	free(buf);
1274 	return err;
1275 }
1276 
1277 static const struct got_error *
1278 get_commit_from_imsg(struct got_commit_object **commit,
1279     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1280 {
1281 	const struct got_error *err = NULL;
1282 	struct got_imsg_commit_object *icommit;
1283 	size_t len = 0;
1284 	int i;
1285 
1286 	if (datalen < sizeof(*icommit))
1287 		return got_error(GOT_ERR_PRIVSEP_LEN);
1288 
1289 	icommit = imsg->data;
1290 	if (datalen != sizeof(*icommit) + icommit->author_len +
1291 	    icommit->committer_len +
1292 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1293 		return got_error(GOT_ERR_PRIVSEP_LEN);
1294 
1295 	if (icommit->nparents < 0)
1296 		return got_error(GOT_ERR_PRIVSEP_LEN);
1297 
1298 	len += sizeof(*icommit);
1299 
1300 	*commit = got_object_commit_alloc_partial();
1301 	if (*commit == NULL)
1302 		return got_error_from_errno(
1303 		    "got_object_commit_alloc_partial");
1304 
1305 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1306 	    SHA1_DIGEST_LENGTH);
1307 	(*commit)->author_time = icommit->author_time;
1308 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1309 	(*commit)->committer_time = icommit->committer_time;
1310 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1311 
1312 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1313 	if ((*commit)->author == NULL) {
1314 		err = got_error_from_errno("strndup");
1315 		goto done;
1316 	}
1317 	len += icommit->author_len;
1318 
1319 	(*commit)->committer = strndup(imsg->data + len,
1320 	    icommit->committer_len);
1321 	if ((*commit)->committer == NULL) {
1322 		err = got_error_from_errno("strndup");
1323 		goto done;
1324 	}
1325 	len += icommit->committer_len;
1326 
1327 	if (icommit->logmsg_len == 0) {
1328 		(*commit)->logmsg = strdup("");
1329 		if ((*commit)->logmsg == NULL) {
1330 			err = got_error_from_errno("strdup");
1331 			goto done;
1332 		}
1333 	} else {
1334 		size_t offset = 0, remain = icommit->logmsg_len;
1335 
1336 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1337 		if ((*commit)->logmsg == NULL) {
1338 			err = got_error_from_errno("malloc");
1339 			goto done;
1340 		}
1341 		while (remain > 0) {
1342 			struct imsg imsg_log;
1343 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1344 			    remain);
1345 
1346 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1347 			if (err)
1348 				goto done;
1349 
1350 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1351 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1352 				goto done;
1353 			}
1354 
1355 			memcpy((*commit)->logmsg + offset,
1356 			    imsg_log.data, n);
1357 			imsg_free(&imsg_log);
1358 			offset += n;
1359 			remain -= n;
1360 		}
1361 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1362 	}
1363 
1364 	for (i = 0; i < icommit->nparents; i++) {
1365 		struct got_object_qid *qid;
1366 
1367 		err = got_object_qid_alloc_partial(&qid);
1368 		if (err)
1369 			break;
1370 		memcpy(&qid->id, imsg->data + len +
1371 		    i * SHA1_DIGEST_LENGTH, sizeof(qid->id));
1372 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1373 		(*commit)->nparents++;
1374 	}
1375 done:
1376 	if (err) {
1377 		got_object_commit_close(*commit);
1378 		*commit = NULL;
1379 	}
1380 	return err;
1381 }
1382 
1383 const struct got_error *
1384 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1385 {
1386 	const struct got_error *err = NULL;
1387 	struct imsg imsg;
1388 	size_t datalen;
1389 	const size_t min_datalen =
1390 	    MIN(sizeof(struct got_imsg_error),
1391 	    sizeof(struct got_imsg_commit_object));
1392 
1393 	*commit = NULL;
1394 
1395 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1396 	if (err)
1397 		return err;
1398 
1399 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1400 
1401 	switch (imsg.hdr.type) {
1402 	case GOT_IMSG_COMMIT:
1403 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1404 		break;
1405 	default:
1406 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1407 		break;
1408 	}
1409 
1410 	imsg_free(&imsg);
1411 
1412 	return err;
1413 }
1414 
1415 static const struct got_error *
1416 send_tree_entries_batch(struct imsgbuf *ibuf,
1417     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1418 {
1419 	struct ibuf *wbuf;
1420 	struct got_imsg_tree_entries ientries;
1421 	int i;
1422 
1423 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1424 	if (wbuf == NULL)
1425 		return got_error_from_errno("imsg_create TREE_ENTRY");
1426 
1427 	ientries.nentries = idxN - idx0 + 1;
1428 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1429 		return got_error_from_errno("imsg_add TREE_ENTRY");
1430 
1431 	for (i = idx0; i <= idxN; i++) {
1432 		struct got_parsed_tree_entry *pte = &entries[i];
1433 
1434 		/* Keep in sync with struct got_imsg_tree_object definition! */
1435 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1436 			return got_error_from_errno("imsg_add TREE_ENTRY");
1437 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1438 			return got_error_from_errno("imsg_add TREE_ENTRY");
1439 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1440 			return got_error_from_errno("imsg_add TREE_ENTRY");
1441 
1442 		/* Remaining bytes are the entry's name. */
1443 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1444 			return got_error_from_errno("imsg_add TREE_ENTRY");
1445 	}
1446 
1447 	wbuf->fd = -1;
1448 	imsg_close(ibuf, wbuf);
1449 	return NULL;
1450 }
1451 
1452 static const struct got_error *
1453 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1454     int nentries)
1455 {
1456 	const struct got_error *err = NULL;
1457 	int i, j;
1458 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1459 
1460 	i = 0;
1461 	for (j = 0; j < nentries; j++) {
1462 		struct got_parsed_tree_entry *pte = &entries[j];
1463 		size_t len = sizeof(*pte) + pte->namelen;
1464 
1465 		if (j > 0 &&
1466 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1467 			err = send_tree_entries_batch(ibuf, entries,
1468 			    i, j - 1, entries_len);
1469 			if (err)
1470 				return err;
1471 			i = j;
1472 			entries_len = sizeof(struct got_imsg_tree_entries);
1473 		}
1474 
1475 		entries_len += len;
1476 	}
1477 
1478 	if (j > 0) {
1479 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1480 		    entries_len);
1481 		if (err)
1482 			return err;
1483 	}
1484 
1485 	return NULL;
1486 }
1487 
1488 const struct got_error *
1489 got_privsep_send_tree(struct imsgbuf *ibuf,
1490     struct got_parsed_tree_entry *entries, int nentries)
1491 {
1492 	const struct got_error *err = NULL;
1493 	struct got_imsg_tree_object itree;
1494 
1495 	itree.nentries = nentries;
1496 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1497 	    == -1)
1498 		return got_error_from_errno("imsg_compose TREE");
1499 
1500 	err = send_tree_entries(ibuf, entries, nentries);
1501 	if (err)
1502 		return err;
1503 
1504 	return flush_imsg(ibuf);
1505 }
1506 
1507 
1508 static const struct got_error *
1509 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1510     int *nentries)
1511 {
1512 	const struct got_error *err = NULL;
1513 	struct got_imsg_tree_entries *ientries;
1514 	struct got_tree_entry *te;
1515 	size_t te_offset;
1516 	size_t i;
1517 
1518 	if (datalen <= sizeof(*ientries) ||
1519 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1520 		return got_error(GOT_ERR_PRIVSEP_LEN);
1521 
1522 	ientries = (struct got_imsg_tree_entries *)data;
1523 	if (ientries->nentries > INT_MAX) {
1524 		return got_error_msg(GOT_ERR_NO_SPACE,
1525 		    "too many tree entries");
1526 	}
1527 
1528 	te_offset = sizeof(*ientries);
1529 	for (i = 0; i < ientries->nentries; i++) {
1530 		struct got_imsg_tree_entry ite;
1531 		const char *te_name;
1532 		uint8_t *buf = (uint8_t *)data + te_offset;
1533 
1534 		if (te_offset >= datalen) {
1535 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1536 			break;
1537 		}
1538 
1539 		/* Might not be aligned, size is ~32 bytes. */
1540 		memcpy(&ite, buf, sizeof(ite));
1541 
1542 		if (ite.namelen >= sizeof(te->name)) {
1543 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1544 			break;
1545 		}
1546 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1547 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1548 			break;
1549 		}
1550 
1551 		if (*nentries >= tree->nentries) {
1552 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1553 			break;
1554 		}
1555 		te = &tree->entries[*nentries];
1556 		te_name = buf + sizeof(ite);
1557 		memcpy(te->name, te_name, ite.namelen);
1558 		te->name[ite.namelen] = '\0';
1559 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1560 		te->mode = ite.mode;
1561 		te->idx = *nentries;
1562 		(*nentries)++;
1563 
1564 		te_offset += sizeof(ite) + ite.namelen;
1565 	}
1566 
1567 	return err;
1568 }
1569 
1570 const struct got_error *
1571 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1572 {
1573 	const struct got_error *err = NULL;
1574 	const size_t min_datalen =
1575 	    MIN(sizeof(struct got_imsg_error),
1576 	    sizeof(struct got_imsg_tree_object));
1577 	struct got_imsg_tree_object *itree;
1578 	int nentries = 0;
1579 
1580 	*tree = NULL;
1581 
1582 	err = read_imsg(ibuf);
1583 	if (err)
1584 		goto done;
1585 
1586 	for (;;) {
1587 		struct imsg imsg;
1588 		size_t n;
1589 		size_t datalen;
1590 
1591 		n = imsg_get(ibuf, &imsg);
1592 		if (n == 0) {
1593 			if ((*tree)) {
1594 				if (nentries < (*tree)->nentries) {
1595 					err = read_imsg(ibuf);
1596 					if (err)
1597 						break;
1598 					continue;
1599 				} else
1600 					break;
1601 			} else {
1602 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1603 				break;
1604 			}
1605 		}
1606 
1607 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1608 			imsg_free(&imsg);
1609 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1610 			break;
1611 		}
1612 
1613 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1614 
1615 		switch (imsg.hdr.type) {
1616 		case GOT_IMSG_ERROR:
1617 			err = recv_imsg_error(&imsg, datalen);
1618 			break;
1619 		case GOT_IMSG_TREE:
1620 			/* This message should only appear once. */
1621 			if (*tree != NULL) {
1622 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1623 				break;
1624 			}
1625 			if (datalen != sizeof(*itree)) {
1626 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1627 				break;
1628 			}
1629 			itree = imsg.data;
1630 			if (itree->nentries < 0) {
1631 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1632 				break;
1633 			}
1634 			*tree = malloc(sizeof(**tree));
1635 			if (*tree == NULL) {
1636 				err = got_error_from_errno("malloc");
1637 				break;
1638 			}
1639 			(*tree)->entries = calloc(itree->nentries,
1640 			    sizeof(struct got_tree_entry));
1641 			if ((*tree)->entries == NULL) {
1642 				err = got_error_from_errno("malloc");
1643 				free(*tree);
1644 				*tree = NULL;
1645 				break;
1646 			}
1647 			(*tree)->nentries = itree->nentries;
1648 			(*tree)->refcnt = 0;
1649 			break;
1650 		case GOT_IMSG_TREE_ENTRIES:
1651 			/* This message should be preceeded by GOT_IMSG_TREE. */
1652 			if (*tree == NULL) {
1653 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1654 				break;
1655 			}
1656 			err = recv_tree_entries(imsg.data, datalen,
1657 			    *tree, &nentries);
1658 			break;
1659 		default:
1660 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1661 			break;
1662 		}
1663 
1664 		imsg_free(&imsg);
1665 		if (err)
1666 			break;
1667 	}
1668 done:
1669 	if (*tree && (*tree)->nentries != nentries) {
1670 		if (err == NULL)
1671 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1672 		got_object_tree_close(*tree);
1673 		*tree = NULL;
1674 	}
1675 
1676 	return err;
1677 }
1678 
1679 const struct got_error *
1680 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1681     const uint8_t *data)
1682 {
1683 	struct got_imsg_blob iblob;
1684 
1685 	iblob.size = size;
1686 	iblob.hdrlen = hdrlen;
1687 
1688 	if (data) {
1689 		uint8_t *buf;
1690 
1691 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1692 			return got_error(GOT_ERR_NO_SPACE);
1693 
1694 		buf = malloc(sizeof(iblob) + size);
1695 		if (buf == NULL)
1696 			return got_error_from_errno("malloc");
1697 
1698 		memcpy(buf, &iblob, sizeof(iblob));
1699 		memcpy(buf + sizeof(iblob), data, size);
1700 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1701 		    sizeof(iblob) + size) == -1) {
1702 			free(buf);
1703 			return got_error_from_errno("imsg_compose BLOB");
1704 		}
1705 		free(buf);
1706 	} else {
1707 		/* Data has already been written to file descriptor. */
1708 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1709 		    sizeof(iblob)) == -1)
1710 			return got_error_from_errno("imsg_compose BLOB");
1711 	}
1712 
1713 
1714 	return flush_imsg(ibuf);
1715 }
1716 
1717 const struct got_error *
1718 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1719     struct imsgbuf *ibuf)
1720 {
1721 	const struct got_error *err = NULL;
1722 	struct imsg imsg;
1723 	struct got_imsg_blob *iblob;
1724 	size_t datalen;
1725 
1726 	*outbuf = NULL;
1727 
1728 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1729 	if (err)
1730 		return err;
1731 
1732 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1733 
1734 	switch (imsg.hdr.type) {
1735 	case GOT_IMSG_BLOB:
1736 		if (datalen < sizeof(*iblob)) {
1737 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1738 			break;
1739 		}
1740 		iblob = imsg.data;
1741 		*size = iblob->size;
1742 		*hdrlen = iblob->hdrlen;
1743 
1744 		if (datalen == sizeof(*iblob)) {
1745 			/* Data has been written to file descriptor. */
1746 			break;
1747 		}
1748 
1749 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1750 		    *size > datalen + sizeof(*iblob)) {
1751 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1752 			break;
1753 		}
1754 
1755 		*outbuf = malloc(*size);
1756 		if (*outbuf == NULL) {
1757 			err = got_error_from_errno("malloc");
1758 			break;
1759 		}
1760 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1761 		break;
1762 	default:
1763 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1764 		break;
1765 	}
1766 
1767 	imsg_free(&imsg);
1768 
1769 	return err;
1770 }
1771 
1772 static const struct got_error *
1773 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1774 {
1775 	const struct got_error *err = NULL;
1776 	size_t offset, remain;
1777 
1778 	offset = 0;
1779 	remain = tagmsg_len;
1780 	while (remain > 0) {
1781 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1782 
1783 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1784 		    tag->tagmsg + offset, n) == -1) {
1785 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1786 			break;
1787 		}
1788 
1789 		err = flush_imsg(ibuf);
1790 		if (err)
1791 			break;
1792 
1793 		offset += n;
1794 		remain -= n;
1795 	}
1796 
1797 	return err;
1798 }
1799 
1800 const struct got_error *
1801 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1802 {
1803 	const struct got_error *err = NULL;
1804 	struct got_imsg_tag_object *itag;
1805 	uint8_t *buf;
1806 	size_t len, total;
1807 	size_t tag_len = strlen(tag->tag);
1808 	size_t tagger_len = strlen(tag->tagger);
1809 	size_t tagmsg_len = strlen(tag->tagmsg);
1810 
1811 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1812 
1813 	buf = malloc(total);
1814 	if (buf == NULL)
1815 		return got_error_from_errno("malloc");
1816 
1817 	itag = (struct got_imsg_tag_object *)buf;
1818 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1819 	itag->obj_type = tag->obj_type;
1820 	itag->tag_len = tag_len;
1821 	itag->tagger_len = tagger_len;
1822 	itag->tagger_time = tag->tagger_time;
1823 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1824 	itag->tagmsg_len = tagmsg_len;
1825 
1826 	len = sizeof(*itag);
1827 	memcpy(buf + len, tag->tag, tag_len);
1828 	len += tag_len;
1829 	memcpy(buf + len, tag->tagger, tagger_len);
1830 	len += tagger_len;
1831 
1832 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1833 		err = got_error_from_errno("imsg_compose TAG");
1834 		goto done;
1835 	}
1836 
1837 	if (tagmsg_len == 0 ||
1838 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1839 		err = flush_imsg(ibuf);
1840 		if (err)
1841 			goto done;
1842 	}
1843 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1844 done:
1845 	free(buf);
1846 	return err;
1847 }
1848 
1849 const struct got_error *
1850 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1851 {
1852 	const struct got_error *err = NULL;
1853 	struct imsg imsg;
1854 	struct got_imsg_tag_object *itag;
1855 	size_t len, datalen;
1856 	const size_t min_datalen =
1857 	    MIN(sizeof(struct got_imsg_error),
1858 	    sizeof(struct got_imsg_tag_object));
1859 
1860 	*tag = NULL;
1861 
1862 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1863 	if (err)
1864 		return err;
1865 
1866 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1867 	len = 0;
1868 
1869 	switch (imsg.hdr.type) {
1870 	case GOT_IMSG_TAG:
1871 		if (datalen < sizeof(*itag)) {
1872 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1873 			break;
1874 		}
1875 		itag = imsg.data;
1876 		if (datalen != sizeof(*itag) + itag->tag_len +
1877 		    itag->tagger_len) {
1878 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1879 			break;
1880 		}
1881 		len += sizeof(*itag);
1882 
1883 		*tag = calloc(1, sizeof(**tag));
1884 		if (*tag == NULL) {
1885 			err = got_error_from_errno("calloc");
1886 			break;
1887 		}
1888 
1889 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1890 
1891 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1892 		if ((*tag)->tag == NULL) {
1893 			err = got_error_from_errno("strndup");
1894 			break;
1895 		}
1896 		len += itag->tag_len;
1897 
1898 		(*tag)->obj_type = itag->obj_type;
1899 		(*tag)->tagger_time = itag->tagger_time;
1900 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1901 
1902 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1903 		if ((*tag)->tagger == NULL) {
1904 			err = got_error_from_errno("strndup");
1905 			break;
1906 		}
1907 		len += itag->tagger_len;
1908 
1909 		if (itag->tagmsg_len == 0) {
1910 			(*tag)->tagmsg = strdup("");
1911 			if ((*tag)->tagmsg == NULL) {
1912 				err = got_error_from_errno("strdup");
1913 				break;
1914 			}
1915 		} else {
1916 			size_t offset = 0, remain = itag->tagmsg_len;
1917 
1918 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1919 			if ((*tag)->tagmsg == NULL) {
1920 				err = got_error_from_errno("malloc");
1921 				break;
1922 			}
1923 			while (remain > 0) {
1924 				struct imsg imsg_log;
1925 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1926 				    remain);
1927 
1928 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1929 				if (err)
1930 					return err;
1931 
1932 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1933 					return got_error(GOT_ERR_PRIVSEP_MSG);
1934 
1935 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1936 				    n);
1937 				imsg_free(&imsg_log);
1938 				offset += n;
1939 				remain -= n;
1940 			}
1941 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1942 		}
1943 
1944 		break;
1945 	default:
1946 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1947 		break;
1948 	}
1949 
1950 	imsg_free(&imsg);
1951 
1952 	return err;
1953 }
1954 
1955 const struct got_error *
1956 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1957     struct got_packidx *packidx)
1958 {
1959 	const struct got_error *err = NULL;
1960 	struct got_imsg_packidx ipackidx;
1961 	struct got_imsg_pack ipack;
1962 	int fd;
1963 
1964 	ipackidx.len = packidx->len;
1965 	ipackidx.packfile_size = pack->filesize;
1966 	fd = dup(packidx->fd);
1967 	if (fd == -1)
1968 		return got_error_from_errno("dup");
1969 
1970 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1971 	    sizeof(ipackidx)) == -1) {
1972 		err = got_error_from_errno("imsg_compose PACKIDX");
1973 		close(fd);
1974 		return err;
1975 	}
1976 
1977 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1978 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1979 		return got_error(GOT_ERR_NO_SPACE);
1980 	ipack.filesize = pack->filesize;
1981 
1982 	fd = dup(pack->fd);
1983 	if (fd == -1)
1984 		return got_error_from_errno("dup");
1985 
1986 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1987 	    == -1) {
1988 		err = got_error_from_errno("imsg_compose PACK");
1989 		close(fd);
1990 		return err;
1991 	}
1992 
1993 	return flush_imsg(ibuf);
1994 }
1995 
1996 const struct got_error *
1997 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1998     struct got_object_id *id)
1999 {
2000 	struct got_imsg_packed_object iobj;
2001 
2002 	iobj.idx = idx;
2003 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2004 
2005 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2006 	    &iobj, sizeof(iobj)) == -1)
2007 		return got_error_from_errno("imsg_compose "
2008 		    "PACKED_OBJECT_REQUEST");
2009 
2010 	return flush_imsg(ibuf);
2011 }
2012 
2013 const struct got_error *
2014 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2015     struct got_object_id *id)
2016 {
2017 	struct got_imsg_packed_object iobj;
2018 
2019 	iobj.idx = idx;
2020 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2021 
2022 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2023 	    &iobj, sizeof(iobj)) == -1)
2024 		return got_error_from_errno("imsg_compose "
2025 		    "PACKED_OBJECT_REQUEST");
2026 
2027 	return flush_imsg(ibuf);
2028 }
2029 
2030 const struct got_error *
2031 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2032 {
2033 	const struct got_error *err = NULL;
2034 
2035 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2036 	    NULL, 0) == -1) {
2037 		err = got_error_from_errno("imsg_compose "
2038 		    "GITCONFIG_PARSE_REQUEST");
2039 		close(fd);
2040 		return err;
2041 	}
2042 
2043 	return flush_imsg(ibuf);
2044 }
2045 
2046 const struct got_error *
2047 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2048 {
2049 	if (imsg_compose(ibuf,
2050 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2051 	    NULL, 0) == -1)
2052 		return got_error_from_errno("imsg_compose "
2053 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2054 
2055 	return flush_imsg(ibuf);
2056 }
2057 
2058 const struct got_error *
2059 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2060 {
2061 	if (imsg_compose(ibuf,
2062 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2063 	    NULL, 0) == -1)
2064 		return got_error_from_errno("imsg_compose "
2065 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2066 
2067 	return flush_imsg(ibuf);
2068 }
2069 
2070 
2071 const struct got_error *
2072 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2073 {
2074 	if (imsg_compose(ibuf,
2075 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2076 		return got_error_from_errno("imsg_compose "
2077 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2078 
2079 	return flush_imsg(ibuf);
2080 }
2081 
2082 const struct got_error *
2083 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2084 {
2085 	if (imsg_compose(ibuf,
2086 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2087 		return got_error_from_errno("imsg_compose "
2088 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2089 
2090 	return flush_imsg(ibuf);
2091 }
2092 
2093 const struct got_error *
2094 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2095 {
2096 	if (imsg_compose(ibuf,
2097 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2098 		return got_error_from_errno("imsg_compose "
2099 		    "GITCONFIG_REMOTE_REQUEST");
2100 
2101 	return flush_imsg(ibuf);
2102 }
2103 
2104 const struct got_error *
2105 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2106 {
2107 	if (imsg_compose(ibuf,
2108 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2109 		return got_error_from_errno("imsg_compose "
2110 		    "GITCONFIG_OWNER_REQUEST");
2111 
2112 	return flush_imsg(ibuf);
2113 }
2114 
2115 const struct got_error *
2116 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2117 {
2118 	const struct got_error *err = NULL;
2119 	struct imsg imsg;
2120 	size_t datalen;
2121 
2122 	*str = NULL;
2123 
2124 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2125 	if (err)
2126 		return err;
2127 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2128 
2129 	switch (imsg.hdr.type) {
2130 	case GOT_IMSG_GITCONFIG_STR_VAL:
2131 		if (datalen == 0)
2132 			break;
2133 		/* datalen does not include terminating \0 */
2134 		*str = malloc(datalen + 1);
2135 		if (*str == NULL) {
2136 			err = got_error_from_errno("malloc");
2137 			break;
2138 		}
2139 		memcpy(*str, imsg.data, datalen);
2140 		(*str)[datalen] = '\0';
2141 		break;
2142 	default:
2143 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2144 		break;
2145 	}
2146 
2147 	imsg_free(&imsg);
2148 	return err;
2149 }
2150 
2151 const struct got_error *
2152 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2153 {
2154 	const struct got_error *err = NULL;
2155 	struct imsg imsg;
2156 	size_t datalen;
2157 	const size_t min_datalen =
2158 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2159 
2160 	*val = 0;
2161 
2162 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2163 	if (err)
2164 		return err;
2165 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2166 
2167 	switch (imsg.hdr.type) {
2168 	case GOT_IMSG_GITCONFIG_INT_VAL:
2169 		if (datalen != sizeof(*val)) {
2170 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2171 			break;
2172 		}
2173 		memcpy(val, imsg.data, sizeof(*val));
2174 		break;
2175 	default:
2176 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2177 		break;
2178 	}
2179 
2180 	imsg_free(&imsg);
2181 	return err;
2182 }
2183 
2184 static void
2185 free_remote_data(struct got_remote_repo *remote)
2186 {
2187 	int i;
2188 
2189 	free(remote->name);
2190 	free(remote->fetch_url);
2191 	free(remote->send_url);
2192 	for (i = 0; i < remote->nfetch_branches; i++)
2193 		free(remote->fetch_branches[i]);
2194 	free(remote->fetch_branches);
2195 	for (i = 0; i < remote->nsend_branches; i++)
2196 		free(remote->send_branches[i]);
2197 	free(remote->send_branches);
2198 	for (i = 0; i < remote->nfetch_refs; i++)
2199 		free(remote->fetch_refs[i]);
2200 	free(remote->fetch_refs);
2201 }
2202 
2203 const struct got_error *
2204 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2205     int *nremotes, struct imsgbuf *ibuf)
2206 {
2207 	const struct got_error *err = NULL;
2208 	struct imsg imsg;
2209 	size_t datalen;
2210 	struct got_imsg_remotes iremotes;
2211 	struct got_imsg_remote iremote;
2212 
2213 	*remotes = NULL;
2214 	*nremotes = 0;
2215 	iremotes.nremotes = 0;
2216 
2217 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2218 	if (err)
2219 		return err;
2220 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2221 
2222 	switch (imsg.hdr.type) {
2223 	case GOT_IMSG_GITCONFIG_REMOTES:
2224 		if (datalen != sizeof(iremotes)) {
2225 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2226 			break;
2227 		}
2228 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2229 		if (iremotes.nremotes == 0) {
2230 			imsg_free(&imsg);
2231 			return NULL;
2232 		}
2233 		break;
2234 	default:
2235 		imsg_free(&imsg);
2236 		return got_error(GOT_ERR_PRIVSEP_MSG);
2237 	}
2238 
2239 	imsg_free(&imsg);
2240 
2241 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2242 	if (*remotes == NULL)
2243 		return got_error_from_errno("recallocarray");
2244 
2245 	while (*nremotes < iremotes.nremotes) {
2246 		struct got_remote_repo *remote;
2247 
2248 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2249 		if (err)
2250 			break;
2251 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2252 
2253 		switch (imsg.hdr.type) {
2254 		case GOT_IMSG_GITCONFIG_REMOTE:
2255 			remote = &(*remotes)[*nremotes];
2256 			memset(remote, 0, sizeof(*remote));
2257 			if (datalen < sizeof(iremote)) {
2258 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2259 				break;
2260 			}
2261 			memcpy(&iremote, imsg.data, sizeof(iremote));
2262 			if (iremote.name_len == 0 ||
2263 			    iremote.fetch_url_len == 0 ||
2264 			    iremote.send_url_len == 0 ||
2265 			    (sizeof(iremote) + iremote.name_len +
2266 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2267 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2268 				break;
2269 			}
2270 			remote->name = strndup(imsg.data + sizeof(iremote),
2271 			    iremote.name_len);
2272 			if (remote->name == NULL) {
2273 				err = got_error_from_errno("strndup");
2274 				break;
2275 			}
2276 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2277 			    iremote.name_len, iremote.fetch_url_len);
2278 			if (remote->fetch_url == NULL) {
2279 				err = got_error_from_errno("strndup");
2280 				free_remote_data(remote);
2281 				break;
2282 			}
2283 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2284 			    iremote.name_len + iremote.fetch_url_len,
2285 			    iremote.send_url_len);
2286 			if (remote->send_url == NULL) {
2287 				err = got_error_from_errno("strndup");
2288 				free_remote_data(remote);
2289 				break;
2290 			}
2291 			remote->mirror_references = iremote.mirror_references;
2292 			remote->fetch_all_branches = iremote.fetch_all_branches;
2293 			remote->nfetch_branches = 0;
2294 			remote->fetch_branches = NULL;
2295 			remote->nsend_branches = 0;
2296 			remote->send_branches = NULL;
2297 			remote->nfetch_refs = 0;
2298 			remote->fetch_refs = NULL;
2299 			(*nremotes)++;
2300 			break;
2301 		default:
2302 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2303 			break;
2304 		}
2305 
2306 		imsg_free(&imsg);
2307 		if (err)
2308 			break;
2309 	}
2310 
2311 	if (err) {
2312 		int i;
2313 		for (i = 0; i < *nremotes; i++)
2314 			free_remote_data(&(*remotes)[i]);
2315 		free(*remotes);
2316 		*remotes = NULL;
2317 		*nremotes = 0;
2318 	}
2319 	return err;
2320 }
2321 
2322 const struct got_error *
2323 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2324 {
2325 	const struct got_error *err = NULL;
2326 
2327 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2328 	    NULL, 0) == -1) {
2329 		err = got_error_from_errno("imsg_compose "
2330 		    "GOTCONFIG_PARSE_REQUEST");
2331 		close(fd);
2332 		return err;
2333 	}
2334 
2335 	return flush_imsg(ibuf);
2336 }
2337 
2338 const struct got_error *
2339 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2340 {
2341 	if (imsg_compose(ibuf,
2342 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2343 		return got_error_from_errno("imsg_compose "
2344 		    "GOTCONFIG_AUTHOR_REQUEST");
2345 
2346 	return flush_imsg(ibuf);
2347 }
2348 
2349 const struct got_error *
2350 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2351 {
2352 	if (imsg_compose(ibuf,
2353 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2354 		return got_error_from_errno("imsg_compose "
2355 		    "GOTCONFIG_REMOTE_REQUEST");
2356 
2357 	return flush_imsg(ibuf);
2358 }
2359 
2360 const struct got_error *
2361 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2362 {
2363 	const struct got_error *err = NULL;
2364 	struct imsg imsg;
2365 	size_t datalen;
2366 
2367 	*str = NULL;
2368 
2369 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2370 	if (err)
2371 		return err;
2372 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2373 
2374 	switch (imsg.hdr.type) {
2375 	case GOT_IMSG_ERROR:
2376 		err = recv_imsg_error(&imsg, datalen);
2377 		break;
2378 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2379 		if (datalen == 0)
2380 			break;
2381 		/* datalen does not include terminating \0 */
2382 		*str = malloc(datalen + 1);
2383 		if (*str == NULL) {
2384 			err = got_error_from_errno("malloc");
2385 			break;
2386 		}
2387 		memcpy(*str, imsg.data, datalen);
2388 		(*str)[datalen] = '\0';
2389 		break;
2390 	default:
2391 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2392 		break;
2393 	}
2394 
2395 	imsg_free(&imsg);
2396 	return err;
2397 }
2398 
2399 const struct got_error *
2400 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2401     int *nremotes, struct imsgbuf *ibuf)
2402 {
2403 	const struct got_error *err = NULL;
2404 	struct imsg imsg;
2405 	size_t datalen;
2406 	struct got_imsg_remotes iremotes;
2407 	struct got_imsg_remote iremote;
2408 	const size_t min_datalen =
2409 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2410 
2411 	*remotes = NULL;
2412 	*nremotes = 0;
2413 	iremotes.nremotes = 0;
2414 
2415 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2416 	if (err)
2417 		return err;
2418 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2419 
2420 	switch (imsg.hdr.type) {
2421 	case GOT_IMSG_ERROR:
2422 		err = recv_imsg_error(&imsg, datalen);
2423 		break;
2424 	case GOT_IMSG_GOTCONFIG_REMOTES:
2425 		if (datalen != sizeof(iremotes)) {
2426 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2427 			break;
2428 		}
2429 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2430 		if (iremotes.nremotes < 0) {
2431 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2432 			break;
2433 		}
2434 		if (iremotes.nremotes == 0) {
2435 			imsg_free(&imsg);
2436 			return NULL;
2437 		}
2438 		break;
2439 	default:
2440 		imsg_free(&imsg);
2441 		return got_error(GOT_ERR_PRIVSEP_MSG);
2442 	}
2443 
2444 	imsg_free(&imsg);
2445 
2446 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2447 	if (*remotes == NULL)
2448 		return got_error_from_errno("recallocarray");
2449 
2450 	while (*nremotes < iremotes.nremotes) {
2451 		struct got_remote_repo *remote;
2452 		const size_t min_datalen =
2453 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2454 		int i;
2455 
2456 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2457 		if (err)
2458 			break;
2459 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2460 
2461 		switch (imsg.hdr.type) {
2462 		case GOT_IMSG_ERROR:
2463 			err = recv_imsg_error(&imsg, datalen);
2464 			break;
2465 		case GOT_IMSG_GOTCONFIG_REMOTE:
2466 			remote = &(*remotes)[*nremotes];
2467 			memset(remote, 0, sizeof(*remote));
2468 			if (datalen < sizeof(iremote)) {
2469 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2470 				break;
2471 			}
2472 			memcpy(&iremote, imsg.data, sizeof(iremote));
2473 			if (iremote.name_len == 0 ||
2474 			    (iremote.fetch_url_len == 0 &&
2475 			    iremote.send_url_len == 0) ||
2476 			    (sizeof(iremote) + iremote.name_len +
2477 			    iremote.fetch_url_len + iremote.send_url_len) >
2478 			    datalen) {
2479 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2480 				break;
2481 			}
2482 			remote->name = strndup(imsg.data + sizeof(iremote),
2483 			    iremote.name_len);
2484 			if (remote->name == NULL) {
2485 				err = got_error_from_errno("strndup");
2486 				break;
2487 			}
2488 			remote->fetch_url = strndup(imsg.data +
2489 			    sizeof(iremote) + iremote.name_len,
2490 			    iremote.fetch_url_len);
2491 			if (remote->fetch_url == NULL) {
2492 				err = got_error_from_errno("strndup");
2493 				free_remote_data(remote);
2494 				break;
2495 			}
2496 			remote->send_url = strndup(imsg.data +
2497 			    sizeof(iremote) + iremote.name_len +
2498 			    iremote.fetch_url_len, iremote.send_url_len);
2499 			if (remote->send_url == NULL) {
2500 				err = got_error_from_errno("strndup");
2501 				free_remote_data(remote);
2502 				break;
2503 			}
2504 			remote->mirror_references = iremote.mirror_references;
2505 			remote->fetch_all_branches = iremote.fetch_all_branches;
2506 			if (iremote.nfetch_branches > 0) {
2507 				remote->fetch_branches = recallocarray(NULL, 0,
2508 				    iremote.nfetch_branches, sizeof(char *));
2509 				if (remote->fetch_branches == NULL) {
2510 					err = got_error_from_errno("calloc");
2511 					free_remote_data(remote);
2512 					break;
2513 				}
2514 			}
2515 			remote->nfetch_branches = 0;
2516 			for (i = 0; i < iremote.nfetch_branches; i++) {
2517 				char *branch;
2518 				err = got_privsep_recv_gotconfig_str(&branch,
2519 				    ibuf);
2520 				if (err) {
2521 					free_remote_data(remote);
2522 					goto done;
2523 				}
2524 				remote->fetch_branches[i] = branch;
2525 				remote->nfetch_branches++;
2526 			}
2527 			if (iremote.nsend_branches > 0) {
2528 				remote->send_branches = recallocarray(NULL, 0,
2529 				    iremote.nsend_branches, sizeof(char *));
2530 				if (remote->send_branches == NULL) {
2531 					err = got_error_from_errno("calloc");
2532 					free_remote_data(remote);
2533 					break;
2534 				}
2535 			}
2536 			remote->nsend_branches = 0;
2537 			for (i = 0; i < iremote.nsend_branches; i++) {
2538 				char *branch;
2539 				err = got_privsep_recv_gotconfig_str(&branch,
2540 				    ibuf);
2541 				if (err) {
2542 					free_remote_data(remote);
2543 					goto done;
2544 				}
2545 				remote->send_branches[i] = branch;
2546 				remote->nsend_branches++;
2547 			}
2548 			if (iremote.nfetch_refs > 0) {
2549 				remote->fetch_refs = recallocarray(NULL, 0,
2550 				    iremote.nfetch_refs, sizeof(char *));
2551 				if (remote->fetch_refs == NULL) {
2552 					err = got_error_from_errno("calloc");
2553 					free_remote_data(remote);
2554 					break;
2555 				}
2556 			}
2557 			remote->nfetch_refs = 0;
2558 			for (i = 0; i < iremote.nfetch_refs; i++) {
2559 				char *ref;
2560 				err = got_privsep_recv_gotconfig_str(&ref,
2561 				    ibuf);
2562 				if (err) {
2563 					free_remote_data(remote);
2564 					goto done;
2565 				}
2566 				remote->fetch_refs[i] = ref;
2567 				remote->nfetch_refs++;
2568 			}
2569 			(*nremotes)++;
2570 			break;
2571 		default:
2572 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2573 			break;
2574 		}
2575 
2576 		imsg_free(&imsg);
2577 		if (err)
2578 			break;
2579 	}
2580 done:
2581 	if (err) {
2582 		int i;
2583 		for (i = 0; i < *nremotes; i++)
2584 			free_remote_data(&(*remotes)[i]);
2585 		free(*remotes);
2586 		*remotes = NULL;
2587 		*nremotes = 0;
2588 	}
2589 	return err;
2590 }
2591 
2592 const struct got_error *
2593 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2594     struct got_object_id *id, int idx, const char *path)
2595 {
2596 	struct ibuf *wbuf;
2597 	size_t path_len = strlen(path) + 1;
2598 
2599 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2600 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2601 	if (wbuf == NULL)
2602 		return got_error_from_errno(
2603 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2604 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2605 		return got_error_from_errno("imsg_add "
2606 		    "COMMIT_TRAVERSAL_REQUEST");
2607 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2608 		return got_error_from_errno("imsg_add "
2609 		    "COMMIT_TRAVERSAL_REQUEST");
2610 	if (imsg_add(wbuf, path, path_len) == -1)
2611 		return got_error_from_errno("imsg_add "
2612 		    "COMMIT_TRAVERSAL_REQUEST");
2613 
2614 	wbuf->fd = -1;
2615 	imsg_close(ibuf, wbuf);
2616 
2617 	return flush_imsg(ibuf);
2618 }
2619 
2620 const struct got_error *
2621 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2622     struct got_object_id **changed_commit_id,
2623     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2624 {
2625 	const struct got_error *err = NULL;
2626 	struct imsg imsg;
2627 	struct got_imsg_traversed_commits *icommits;
2628 	size_t datalen;
2629 	int i, done = 0;
2630 
2631 	*changed_commit = NULL;
2632 	*changed_commit_id = NULL;
2633 
2634 	while (!done) {
2635 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2636 		if (err)
2637 			return err;
2638 
2639 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2640 		switch (imsg.hdr.type) {
2641 		case GOT_IMSG_TRAVERSED_COMMITS:
2642 			icommits = imsg.data;
2643 			if (datalen != sizeof(*icommits) +
2644 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2645 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2646 				break;
2647 			}
2648 			for (i = 0; i < icommits->ncommits; i++) {
2649 				struct got_object_qid *qid;
2650 				uint8_t *sha1 = (uint8_t *)imsg.data +
2651 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2652 				err = got_object_qid_alloc_partial(&qid);
2653 				if (err)
2654 					break;
2655 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2656 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2657 
2658 				/* The last commit may contain a change. */
2659 				if (i == icommits->ncommits - 1) {
2660 					*changed_commit_id =
2661 					    got_object_id_dup(&qid->id);
2662 					if (*changed_commit_id == NULL) {
2663 						err = got_error_from_errno(
2664 						    "got_object_id_dup");
2665 						break;
2666 					}
2667 				}
2668 			}
2669 			break;
2670 		case GOT_IMSG_COMMIT:
2671 			if (*changed_commit_id == NULL) {
2672 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2673 				break;
2674 			}
2675 			err = get_commit_from_imsg(changed_commit, &imsg,
2676 			    datalen, ibuf);
2677 			break;
2678 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2679 			done = 1;
2680 			break;
2681 		default:
2682 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2683 			break;
2684 		}
2685 
2686 		imsg_free(&imsg);
2687 		if (err)
2688 			break;
2689 	}
2690 
2691 	if (err)
2692 		got_object_id_queue_free(commit_ids);
2693 	return err;
2694 }
2695 
2696 const struct got_error *
2697 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2698     struct got_object_id *tree_id, const char *path,
2699     struct got_parsed_tree_entry *entries, int nentries)
2700 {
2701 	const struct got_error *err = NULL;
2702 	struct ibuf *wbuf;
2703 	size_t path_len = strlen(path);
2704 	size_t msglen;
2705 
2706 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2707 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2708 	if (wbuf == NULL)
2709 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2710 
2711 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2712 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2713 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2714 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2715 	if (imsg_add(wbuf, path, path_len) == -1)
2716 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2717 
2718 	wbuf->fd = -1;
2719 	imsg_close(ibuf, wbuf);
2720 
2721 	if (entries) {
2722 		err = send_tree_entries(ibuf, entries, nentries);
2723 		if (err)
2724 			return err;
2725 	}
2726 
2727 	return flush_imsg(ibuf);
2728 }
2729 
2730 const struct got_error *
2731 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2732 {
2733 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2734 	    0, 0, -1, NULL, 0) == -1)
2735 		return got_error_from_errno("imsg_compose "
2736 		    "OBJECT_ENUMERATION_REQUEST");
2737 
2738 	return flush_imsg(ibuf);
2739 }
2740 
2741 const struct got_error *
2742 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2743 {
2744 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2745 	    0, 0, -1, NULL, 0) == -1)
2746 		return got_error_from_errno("imsg_compose "
2747 		    "OBJECT_ENUMERATION_DONE");
2748 
2749 	return flush_imsg(ibuf);
2750 }
2751 
2752 const struct got_error *
2753 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2754 {
2755 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2756 	    0, 0, -1, NULL, 0) == -1)
2757 		return got_error_from_errno("imsg_compose "
2758 		    "OBJECT_ENUMERATION_INCOMPLETE");
2759 
2760 	return flush_imsg(ibuf);
2761 }
2762 
2763 const struct got_error *
2764 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2765     struct got_object_id *id, time_t mtime)
2766 {
2767 	struct ibuf *wbuf;
2768 
2769 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2770 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2771 	if (wbuf == NULL)
2772 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2773 
2774 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2775 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2776 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2777 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2778 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2779 
2780 	wbuf->fd = -1;
2781 	imsg_close(ibuf, wbuf);
2782 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2783 	return NULL;
2784 }
2785 
2786 const struct got_error *
2787 got_privsep_recv_enumerated_objects(int *found_all_objects,
2788     struct imsgbuf *ibuf,
2789     got_object_enumerate_commit_cb cb_commit,
2790     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2791     struct got_repository *repo)
2792 {
2793 	const struct got_error *err = NULL;
2794 	struct imsg imsg;
2795 	struct got_imsg_enumerated_commit *icommit = NULL;
2796 	struct got_object_id commit_id;
2797 	int have_commit = 0;
2798 	time_t mtime = 0;
2799 	struct got_tree_object tree;
2800 	struct got_imsg_enumerated_tree *itree;
2801 	struct got_object_id tree_id;
2802 	char *path = NULL, *canon_path = NULL;
2803 	size_t datalen, path_len;
2804 	int nentries = -1;
2805 	int done = 0;
2806 
2807 	*found_all_objects = 0;
2808 	memset(&tree, 0, sizeof(tree));
2809 
2810 	while (!done) {
2811 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2812 		if (err)
2813 			break;
2814 
2815 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2816 		switch (imsg.hdr.type) {
2817 		case GOT_IMSG_ENUMERATED_COMMIT:
2818 			if (have_commit && nentries != -1) {
2819 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2820 				break;
2821 			}
2822 			if (datalen != sizeof(*icommit)) {
2823 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2824 				break;
2825 			}
2826 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2827 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2828 			mtime = icommit->mtime;
2829 			have_commit = 1;
2830 			break;
2831 		case GOT_IMSG_ENUMERATED_TREE:
2832 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2833 			if (!have_commit) {
2834 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2835 				break;
2836 			}
2837 			if (datalen < sizeof(*itree)) {
2838 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2839 				break;
2840 			}
2841 			itree = imsg.data;
2842 			path_len = datalen - sizeof(*itree);
2843 			if (path_len == 0) {
2844 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2845 				break;
2846 			}
2847 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2848 			free(path);
2849 			path = malloc(path_len + 1);
2850 			if (path == NULL) {
2851 				err = got_error_from_errno("malloc");
2852 				break;
2853 			}
2854 			free(canon_path);
2855 			canon_path = malloc(path_len + 1);
2856 			if (canon_path == NULL) {
2857 				err = got_error_from_errno("malloc");
2858 				break;
2859 			}
2860 			memcpy(path, (uint8_t *)imsg.data + sizeof(*itree),
2861 			    path_len);
2862 			path[path_len] = '\0';
2863 			if (!got_path_is_absolute(path)) {
2864 				err = got_error(GOT_ERR_BAD_PATH);
2865 				break;
2866 			}
2867 			if (got_path_is_root_dir(path)) {
2868 				/* XXX check what got_canonpath() does wrong */
2869 				canon_path[0] = '/';
2870 				canon_path[1] = '\0';
2871 			} else {
2872 				err = got_canonpath(path, canon_path,
2873 				    path_len + 1);
2874 				if (err)
2875 					break;
2876 			}
2877 			if (strcmp(path, canon_path) != 0) {
2878 				err = got_error(GOT_ERR_BAD_PATH);
2879 				break;
2880 			}
2881 			if (nentries != -1) {
2882 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2883 				break;
2884 			}
2885 			if (itree->nentries < -1) {
2886 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2887 				break;
2888 			}
2889 			if (itree->nentries == -1) {
2890 				/* Tree was not found in pack file. */
2891 				done = 1;
2892 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2893 				    path, repo);
2894 				break;
2895 			}
2896 			if (itree->nentries > INT_MAX) {
2897 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2898 				break;
2899 			}
2900 			tree.entries = calloc(itree->nentries,
2901 			    sizeof(struct got_tree_entry));
2902 			if (tree.entries == NULL) {
2903 				err = got_error_from_errno("calloc");
2904 				break;
2905 			}
2906 			if (itree->nentries == 0) {
2907 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2908 				    path, repo);
2909 				if (err)
2910 					break;
2911 
2912 				/* Prepare for next tree. */
2913 				free(tree.entries);
2914 				memset(&tree, 0, sizeof(tree));
2915 				nentries = -1;
2916 			} else {
2917 				tree.nentries = itree->nentries;
2918 				nentries = 0;
2919 			}
2920 			break;
2921 		case GOT_IMSG_TREE_ENTRIES:
2922 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2923 			if (nentries <= -1) {
2924 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2925 				break;
2926 			}
2927 			err = recv_tree_entries(imsg.data, datalen,
2928 			    &tree, &nentries);
2929 			if (err)
2930 				break;
2931 			if (tree.nentries == nentries) {
2932 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2933 				    path, repo);
2934 				if (err)
2935 					break;
2936 
2937 				/* Prepare for next tree. */
2938 				free(tree.entries);
2939 				memset(&tree, 0, sizeof(tree));
2940 				nentries = -1;
2941 			}
2942 			break;
2943 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2944 			/* All trees have been found and traversed. */
2945 			if (!have_commit || path == NULL || nentries != -1) {
2946 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2947 				break;
2948 			}
2949 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2950 			if (err)
2951 				break;
2952 			have_commit = 0;
2953 			break;
2954 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2955 			*found_all_objects = 1;
2956 			done = 1;
2957 			break;
2958 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
2959 			done = 1;
2960 			break;
2961 		default:
2962 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2963 			break;
2964 		}
2965 
2966 		imsg_free(&imsg);
2967 		if (err)
2968 			break;
2969 	}
2970 
2971 	free(path);
2972 	free(canon_path);
2973 	free(tree.entries);
2974 	return err;
2975 }
2976 
2977 const struct got_error *
2978 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2979     struct got_object_id *id)
2980 {
2981 	struct got_imsg_raw_delta_request dreq;
2982 
2983 	dreq.idx = idx;
2984 	memcpy(dreq.id, id->sha1, SHA1_DIGEST_LENGTH);
2985 
2986 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
2987 	    &dreq, sizeof(dreq)) == -1)
2988 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
2989 
2990 	return flush_imsg(ibuf);
2991 }
2992 
2993 const struct got_error *
2994 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
2995 {
2996 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
2997 }
2998 
2999 const struct got_error *
3000 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3001     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3002     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3003 {
3004 	struct got_imsg_raw_delta idelta;
3005 	int ret;
3006 
3007 	idelta.base_size = base_size;
3008 	idelta.result_size = result_size;
3009 	idelta.delta_size = delta_size;
3010 	idelta.delta_compressed_size = delta_compressed_size;
3011 	idelta.delta_offset = delta_offset;
3012 	idelta.delta_out_offset = delta_out_offset;
3013 	memcpy(idelta.base_id, base_id->sha1, SHA1_DIGEST_LENGTH);
3014 
3015 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3016 	    &idelta, sizeof(idelta));
3017 	if (ret == -1)
3018 		return got_error_from_errno("imsg_compose RAW_DELTA");
3019 
3020 	return flush_imsg(ibuf);
3021 }
3022 
3023 const struct got_error *
3024 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3025     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3026     off_t *delta_out_offset, struct got_object_id **base_id, struct imsgbuf *ibuf)
3027 {
3028 	const struct got_error *err = NULL;
3029 	struct imsg imsg;
3030 	struct got_imsg_raw_delta *delta;
3031 	size_t datalen;
3032 
3033 	*base_size = 0;
3034 	*result_size = 0;
3035 	*delta_size = 0;
3036 	*delta_compressed_size = 0;
3037 	*delta_offset = 0;
3038 	*delta_out_offset = 0;
3039 	*base_id = NULL;
3040 
3041 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3042 	if (err)
3043 		return err;
3044 
3045 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3046 
3047 	switch (imsg.hdr.type) {
3048 	case GOT_IMSG_RAW_DELTA:
3049 		if (datalen != sizeof(*delta)) {
3050 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3051 			break;
3052 		}
3053 		delta = imsg.data;
3054 		*base_size = delta->base_size;
3055 		*result_size = delta->result_size;
3056 		*delta_size = delta->delta_size;
3057 		*delta_compressed_size = delta->delta_compressed_size;
3058 		*delta_offset = delta->delta_offset;
3059 		*delta_out_offset = delta->delta_out_offset;
3060 		*base_id = calloc(1, sizeof(**base_id));
3061 		if (*base_id == NULL) {
3062 			err = got_error_from_errno("malloc");
3063 			break;
3064 		}
3065 		memcpy((*base_id)->sha1, delta->base_id, SHA1_DIGEST_LENGTH);
3066 		break;
3067 	default:
3068 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3069 		break;
3070 	}
3071 
3072 	imsg_free(&imsg);
3073 
3074 	if (err) {
3075 		free(*base_id);
3076 		*base_id = NULL;
3077 	}
3078 	return err;
3079 }
3080 
3081 static const struct got_error *
3082 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3083 {
3084 	const struct got_error *err = NULL;
3085 	struct got_imsg_object_idlist idlist;
3086 	struct ibuf *wbuf;
3087 	size_t i;
3088 
3089 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3090 		return got_error(GOT_ERR_NO_SPACE);
3091 
3092 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3093 	    sizeof(idlist) + nids * sizeof(**ids));
3094 	if (wbuf == NULL) {
3095 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3096 		return err;
3097 	}
3098 
3099 	idlist.nids = nids;
3100 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3101 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3102 
3103 	for (i = 0; i < nids; i++) {
3104 		struct got_object_id *id = ids[i];
3105 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3106 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3107 	}
3108 
3109 	wbuf->fd = -1;
3110 	imsg_close(ibuf, wbuf);
3111 
3112 	return flush_imsg(ibuf);
3113 }
3114 
3115 const struct got_error *
3116 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3117     struct got_object_id **ids, size_t nids)
3118 {
3119 	const struct got_error *err = NULL;
3120 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3121 	int i, queued = 0;
3122 
3123 	for (i = 0; i < nids; i++) {
3124 		idlist[i % nitems(idlist)] = ids[i];
3125 		queued++;
3126 		if (queued >= nitems(idlist)) {
3127 			err = send_idlist(ibuf, idlist, queued);
3128 			if (err)
3129 				return err;
3130 			queued = 0;
3131 		}
3132 	}
3133 
3134 	if (queued > 0) {
3135 		err = send_idlist(ibuf, idlist, queued);
3136 		if (err)
3137 			return err;
3138 	}
3139 
3140 	return NULL;
3141 }
3142 
3143 const struct got_error *
3144 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3145 {
3146 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3147 	    == -1)
3148 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3149 
3150 	return flush_imsg(ibuf);
3151 }
3152 
3153 const struct got_error *
3154 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3155     size_t *nids, struct imsgbuf *ibuf)
3156 {
3157 	const struct got_error *err = NULL;
3158 	struct imsg imsg;
3159 	struct got_imsg_object_idlist *idlist;
3160 	size_t datalen;
3161 
3162 	*ids = NULL;
3163 	*done = 0;
3164 	*nids = 0;
3165 
3166 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3167 	if (err)
3168 		return err;
3169 
3170 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3171 	switch (imsg.hdr.type) {
3172 	case GOT_IMSG_OBJ_ID_LIST:
3173 		if (datalen < sizeof(*idlist)) {
3174 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3175 			break;
3176 		}
3177 		idlist = imsg.data;
3178 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3179 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3180 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3181 			break;
3182 		}
3183 		*nids = idlist->nids;
3184 		*ids = calloc(*nids, sizeof(**ids));
3185 		if (*ids == NULL) {
3186 			err = got_error_from_errno("calloc");
3187 			break;
3188 		}
3189 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3190 		    *nids * sizeof(**ids));
3191 		break;
3192 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3193 		*done = 1;
3194 		break;
3195 	default:
3196 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3197 		break;
3198 	}
3199 
3200 	imsg_free(&imsg);
3201 
3202 	return err;
3203 }
3204 
3205 const struct got_error *
3206 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3207 {
3208 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3209 	    == -1)
3210 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3211 
3212 	return flush_imsg(ibuf);
3213 }
3214 
3215 const struct got_error *
3216 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3217     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3218 {
3219 	const struct got_error *err = NULL;
3220 	struct ibuf *wbuf;
3221 	struct got_imsg_reused_deltas ideltas;
3222 	size_t i;
3223 
3224 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3225 		return got_error(GOT_ERR_NO_SPACE);
3226 
3227 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3228 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3229 	if (wbuf == NULL) {
3230 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3231 		return err;
3232 	}
3233 
3234 	ideltas.ndeltas = ndeltas;
3235 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3236 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3237 
3238 	for (i = 0; i < ndeltas; i++) {
3239 		struct got_imsg_reused_delta *delta = &deltas[i];
3240 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3241 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3242 	}
3243 
3244 	wbuf->fd = -1;
3245 	imsg_close(ibuf, wbuf);
3246 
3247 	return flush_imsg(ibuf);
3248 }
3249 
3250 const struct got_error *
3251 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3252 {
3253 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3254 	    == -1)
3255 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3256 
3257 	return flush_imsg(ibuf);
3258 }
3259 
3260 const struct got_error *
3261 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3262     size_t *ndeltas, struct imsgbuf *ibuf)
3263 {
3264 	const struct got_error *err = NULL;
3265 	struct imsg imsg;
3266 	struct got_imsg_reused_deltas *ideltas;
3267 	size_t datalen;
3268 
3269 	*done = 0;
3270 	*ndeltas = 0;
3271 
3272 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3273 	if (err)
3274 		return err;
3275 
3276 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3277 	switch (imsg.hdr.type) {
3278 	case GOT_IMSG_REUSED_DELTAS:
3279 		if (datalen < sizeof(*ideltas)) {
3280 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3281 			break;
3282 		}
3283 		ideltas = imsg.data;
3284 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3285 		    ideltas->ndeltas * sizeof(*deltas) >
3286 		    datalen - sizeof(*ideltas)) {
3287 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3288 			break;
3289 		}
3290 		*ndeltas = ideltas->ndeltas;
3291 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3292 		    *ndeltas * sizeof(*deltas));
3293 		break;
3294 	case GOT_IMSG_DELTA_REUSE_DONE:
3295 		*done = 1;
3296 		break;
3297 	default:
3298 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3299 		break;
3300 	}
3301 
3302 	imsg_free(&imsg);
3303 
3304 	return err;
3305 }
3306 
3307 const struct got_error *
3308 got_privsep_unveil_exec_helpers(void)
3309 {
3310 	const char *helpers[] = {
3311 	    GOT_PATH_PROG_READ_PACK,
3312 	    GOT_PATH_PROG_READ_OBJECT,
3313 	    GOT_PATH_PROG_READ_COMMIT,
3314 	    GOT_PATH_PROG_READ_TREE,
3315 	    GOT_PATH_PROG_READ_BLOB,
3316 	    GOT_PATH_PROG_READ_TAG,
3317 	    GOT_PATH_PROG_READ_GITCONFIG,
3318 	    GOT_PATH_PROG_READ_GOTCONFIG,
3319 	    GOT_PATH_PROG_READ_PATCH,
3320 	    GOT_PATH_PROG_FETCH_PACK,
3321 	    GOT_PATH_PROG_INDEX_PACK,
3322 	    GOT_PATH_PROG_SEND_PACK,
3323 	};
3324 	size_t i;
3325 
3326 	for (i = 0; i < nitems(helpers); i++) {
3327 		if (unveil(helpers[i], "x") == 0)
3328 			continue;
3329 		return got_error_from_errno2("unveil", helpers[i]);
3330 	}
3331 
3332 	return NULL;
3333 }
3334 
3335 void
3336 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3337 {
3338 	if (close(imsg_fds[0]) == -1) {
3339 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3340 		_exit(1);
3341 	}
3342 
3343 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3344 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3345 		_exit(1);
3346 	}
3347 
3348 	closefrom(GOT_IMSG_FD_CHILD + 1);
3349 
3350 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3351 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3352 		    strerror(errno));
3353 		_exit(1);
3354 	}
3355 }