1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <unistd.h>
33 #include <zlib.h>
34 #include <time.h>
35 
36 #include "got_compat.h"
37 
38 #include "got_object.h"
39 #include "got_error.h"
40 #include "got_path.h"
41 #include "got_repository.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
50 
51 #include "got_privsep.h"
52 
53 #ifndef MIN
54 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 #endif
56 
57 #ifndef nitems
58 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
59 #endif
60 
61 static const struct got_error *
62 poll_fd(int fd, int events, int timeout)
63 {
64 	struct pollfd pfd[1];
65 	struct timespec ts;
66 	sigset_t sigset;
67 	int n;
68 
69 	pfd[0].fd = fd;
70 	pfd[0].events = events;
71 
72 	ts.tv_sec = timeout;
73 	ts.tv_nsec = 0;
74 
75 	if (sigemptyset(&sigset) == -1)
76 		return got_error_from_errno("sigemptyset");
77 	if (sigaddset(&sigset, SIGWINCH) == -1)
78 		return got_error_from_errno("sigaddset");
79 
80 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
81 	if (n == -1)
82 		return got_error_from_errno("ppoll");
83 	if (n == 0)
84 		return got_error(GOT_ERR_TIMEOUT);
85 	if (pfd[0].revents & (POLLERR | POLLNVAL))
86 		return got_error_from_errno("poll error");
87 	if (pfd[0].revents & (events | POLLHUP))
88 		return NULL;
89 
90 	return got_error(GOT_ERR_INTERRUPT);
91 }
92 
93 static const struct got_error *
94 read_imsg(struct imsgbuf *ibuf)
95 {
96 	const struct got_error *err;
97 	size_t n;
98 
99 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
100 	if (err)
101 		return err;
102 
103 	n = imsg_read(ibuf);
104 	if (n == -1) {
105 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
106 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
107 		return got_error(GOT_ERR_PRIVSEP_READ);
108 	}
109 	if (n == 0)
110 		return got_error(GOT_ERR_PRIVSEP_PIPE);
111 
112 	return NULL;
113 }
114 
115 const struct got_error *
116 got_privsep_wait_for_child(pid_t pid)
117 {
118 	int child_status;
119 
120 	if (waitpid(pid, &child_status, 0) == -1)
121 		return got_error_from_errno("waitpid");
122 
123 	if (!WIFEXITED(child_status))
124 		return got_error(GOT_ERR_PRIVSEP_DIED);
125 
126 	if (WEXITSTATUS(child_status) != 0)
127 		return got_error(GOT_ERR_PRIVSEP_EXIT);
128 
129 	return NULL;
130 }
131 
132 static const struct got_error *
133 recv_imsg_error(struct imsg *imsg, size_t datalen)
134 {
135 	struct got_imsg_error *ierr;
136 
137 	if (datalen != sizeof(*ierr))
138 		return got_error(GOT_ERR_PRIVSEP_LEN);
139 
140 	ierr = imsg->data;
141 	if (ierr->code == GOT_ERR_ERRNO) {
142 		static struct got_error serr;
143 		serr.code = GOT_ERR_ERRNO;
144 		serr.msg = strerror(ierr->errno_code);
145 		return &serr;
146 	}
147 
148 	return got_error(ierr->code);
149 }
150 
151 const struct got_error *
152 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
153     size_t min_datalen)
154 {
155 	const struct got_error *err;
156 	ssize_t n;
157 
158 	n = imsg_get(ibuf, imsg);
159 	if (n == -1)
160 		return got_error_from_errno("imsg_get");
161 
162 	while (n == 0) {
163 		err = read_imsg(ibuf);
164 		if (err)
165 			return err;
166 		n = imsg_get(ibuf, imsg);
167 		if (n == -1)
168 			return got_error_from_errno("imsg_get");
169 	}
170 
171 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
172 		return got_error(GOT_ERR_PRIVSEP_LEN);
173 
174 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
175 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
176 		return recv_imsg_error(imsg, datalen);
177 	}
178 
179 	return NULL;
180 }
181 
182 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
183 void
184 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
185 {
186 	const struct got_error *poll_err;
187 	struct got_imsg_error ierr;
188 	int ret;
189 
190 	ierr.code = err->code;
191 	if (err->code == GOT_ERR_ERRNO)
192 		ierr.errno_code = errno;
193 	else
194 		ierr.errno_code = 0;
195 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
196 	if (ret == -1) {
197 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
198 		    getprogname(), err->code, err->msg, strerror(errno));
199 		return;
200 	}
201 
202 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
203 	if (poll_err) {
204 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
205 		    getprogname(), err->code, err->msg, poll_err->msg);
206 		return;
207 	}
208 
209 	ret = imsg_flush(ibuf);
210 	if (ret == -1) {
211 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
212 		    getprogname(), err->code, err->msg, strerror(errno));
213 		imsg_clear(ibuf);
214 		return;
215 	}
216 }
217 
218 static const struct got_error *
219 flush_imsg(struct imsgbuf *ibuf)
220 {
221 	const struct got_error *err;
222 
223 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
224 	if (err)
225 		return err;
226 
227 	if (imsg_flush(ibuf) == -1) {
228 		imsg_clear(ibuf);
229 		return got_error_from_errno("imsg_flush");
230 	}
231 
232 	return NULL;
233 }
234 
235 const struct got_error *
236 got_privsep_flush_imsg(struct imsgbuf *ibuf)
237 {
238 	return flush_imsg(ibuf);
239 }
240 
241 const struct got_error *
242 got_privsep_send_stop(int fd)
243 {
244 	const struct got_error *err = NULL;
245 	struct imsgbuf ibuf;
246 
247 	imsg_init(&ibuf, fd);
248 
249 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
250 		return got_error_from_errno("imsg_compose STOP");
251 
252 	err = flush_imsg(&ibuf);
253 	return err;
254 }
255 
256 const struct got_error *
257 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
258     struct got_object_id *id)
259 {
260 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
261 	    id, sizeof(*id)) == -1)
262 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
263 
264 	return flush_imsg(ibuf);
265 }
266 
267 const struct got_error *
268 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
269     struct got_object_id *id)
270 {
271 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
272 	    id, sizeof(*id)) == -1)
273 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
274 
275 	return flush_imsg(ibuf);
276 }
277 
278 const struct got_error *
279 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
280 {
281 	const struct got_error *err = NULL;
282 
283 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
284 	    == -1) {
285 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
286 		close(outfd);
287 		return err;
288 	}
289 
290 	return flush_imsg(ibuf);
291 }
292 
293 const struct got_error *
294 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
295     uint8_t *data)
296 {
297 	const struct got_error *err = NULL;
298 	struct got_imsg_raw_obj iobj;
299 	size_t len = sizeof(iobj);
300 	struct ibuf *wbuf;
301 
302 	memset(&iobj, 0, sizeof(iobj));
303 	iobj.hdrlen = hdrlen;
304 	iobj.size = size;
305 
306 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
307 		len += (size_t)size + hdrlen;
308 
309 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
310 	if (wbuf == NULL) {
311 		err = got_error_from_errno("imsg_create RAW_OBJECT");
312 		return err;
313 	}
314 
315 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
316 		return got_error_from_errno("imsg_add RAW_OBJECT");
317 
318 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
319 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
320 			return got_error_from_errno("imsg_add RAW_OBJECT");
321 	}
322 
323 	wbuf->fd = -1;
324 	imsg_close(ibuf, wbuf);
325 
326 	return flush_imsg(ibuf);
327 }
328 
329 const struct got_error *
330 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
331     struct imsgbuf *ibuf)
332 {
333 	const struct got_error *err = NULL;
334 	struct imsg imsg;
335 	struct got_imsg_raw_obj *iobj;
336 	size_t datalen;
337 
338 	*outbuf = NULL;
339 
340 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
341 	if (err)
342 		return err;
343 
344 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
345 
346 	switch (imsg.hdr.type) {
347 	case GOT_IMSG_RAW_OBJECT:
348 		if (datalen < sizeof(*iobj)) {
349 			err = got_error(GOT_ERR_PRIVSEP_LEN);
350 			break;
351 		}
352 		iobj = imsg.data;
353 		*size = iobj->size;
354 		*hdrlen = iobj->hdrlen;
355 
356 		if (datalen == sizeof(*iobj)) {
357 			/* Data has been written to file descriptor. */
358 			break;
359 		}
360 
361 		if (*size < 0 ||
362 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
363 			err = got_error(GOT_ERR_PRIVSEP_LEN);
364 			break;
365 		}
366 
367 		*outbuf = malloc(*size + *hdrlen);
368 		if (*outbuf == NULL) {
369 			err = got_error_from_errno("malloc");
370 			break;
371 		}
372 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
373 		break;
374 	default:
375 		err = got_error(GOT_ERR_PRIVSEP_MSG);
376 		break;
377 	}
378 
379 	imsg_free(&imsg);
380 
381 	return err;
382 }
383 
384 const struct got_error *
385 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
386     struct got_object_id *id, int pack_idx)
387 {
388 	const struct got_error *err = NULL;
389 	struct got_imsg_packed_object iobj;
390 	void *data;
391 	size_t len;
392 
393 	memset(&iobj, 0, sizeof(iobj));
394 	if (pack_idx != -1) { /* commit is packed */
395 		iobj.idx = pack_idx;
396 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
397 		data = &iobj;
398 		len = sizeof(iobj);
399 	} else {
400 		data = id;
401 		len = sizeof(*id);
402 	}
403 
404 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
405 	    == -1) {
406 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
407 		close(fd);
408 		return err;
409 	}
410 
411 	return flush_imsg(ibuf);
412 }
413 
414 const struct got_error *
415 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
416     struct got_object_id *id, int pack_idx)
417 {
418 	struct ibuf *wbuf;
419 	size_t len;
420 
421 	if (pack_idx != -1)
422 		len = sizeof(struct got_imsg_packed_object);
423 	else
424 		len = sizeof(*id);
425 
426 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
427 	if (wbuf == NULL)
428 		return got_error_from_errno("imsg_create TREE_REQUEST");
429 
430 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
431 		return got_error_from_errno("imsg_add TREE_REQUEST");
432 
433 	if (pack_idx != -1) { /* tree is packed */
434 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
435 			return got_error_from_errno("imsg_add TREE_REQUEST");
436 	}
437 
438 	wbuf->fd = fd;
439 	imsg_close(ibuf, wbuf);
440 
441 	return flush_imsg(ibuf);
442 }
443 
444 const struct got_error *
445 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
446     struct got_object_id *id, int pack_idx)
447 {
448 	struct got_imsg_packed_object iobj;
449 	void *data;
450 	size_t len;
451 
452 	memset(&iobj, 0, sizeof(iobj));
453 	if (pack_idx != -1) { /* tag is packed */
454 		iobj.idx = pack_idx;
455 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
456 		data = &iobj;
457 		len = sizeof(iobj);
458 	} else {
459 		data = id;
460 		len = sizeof(*id);
461 	}
462 
463 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
464 	    == -1)
465 		return got_error_from_errno("imsg_compose TAG_REQUEST");
466 
467 	return flush_imsg(ibuf);
468 }
469 
470 const struct got_error *
471 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
472     struct got_object_id *id, int pack_idx)
473 {
474 	const struct got_error *err = NULL;
475 	struct got_imsg_packed_object iobj;
476 	void *data;
477 	size_t len;
478 
479 	memset(&iobj, 0, sizeof(iobj));
480 	if (pack_idx != -1) { /* blob is packed */
481 		iobj.idx = pack_idx;
482 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
483 		data = &iobj;
484 		len = sizeof(iobj);
485 	} else {
486 		data = id;
487 		len = sizeof(*id);
488 	}
489 
490 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
491 	    == -1) {
492 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
493 		close(infd);
494 		return err;
495 	}
496 
497 	return flush_imsg(ibuf);
498 }
499 
500 const struct got_error *
501 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
502 {
503 	const struct got_error *err = NULL;
504 
505 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
506 	    == -1) {
507 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
508 		close(outfd);
509 		return err;
510 	}
511 
512 	return flush_imsg(ibuf);
513 }
514 
515 static const struct got_error *
516 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
517 {
518 	const struct got_error *err = NULL;
519 
520 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
521 		err = got_error_from_errno("imsg_compose TMPFD");
522 		close(fd);
523 		return err;
524 	}
525 
526 	return flush_imsg(ibuf);
527 }
528 
529 const struct got_error *
530 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
531 {
532 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
533 }
534 
535 const struct got_error *
536 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
537 {
538 	struct got_imsg_object iobj;
539 
540 	memset(&iobj, 0, sizeof(iobj));
541 
542 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
543 	iobj.type = obj->type;
544 	iobj.flags = obj->flags;
545 	iobj.hdrlen = obj->hdrlen;
546 	iobj.size = obj->size;
547 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
548 		iobj.pack_offset = obj->pack_offset;
549 		iobj.pack_idx = obj->pack_idx;
550 	}
551 
552 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
553 	    == -1)
554 		return got_error_from_errno("imsg_compose OBJECT");
555 
556 	return flush_imsg(ibuf);
557 }
558 
559 const struct got_error *
560 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
561     struct got_pathlist_head *have_refs, int fetch_all_branches,
562     struct got_pathlist_head *wanted_branches,
563     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
564 {
565 	const struct got_error *err = NULL;
566 	struct ibuf *wbuf;
567 	size_t len;
568 	struct got_pathlist_entry *pe;
569 	struct got_imsg_fetch_request fetchreq;
570 
571 	memset(&fetchreq, 0, sizeof(fetchreq));
572 	fetchreq.fetch_all_branches = fetch_all_branches;
573 	fetchreq.list_refs_only = list_refs_only;
574 	fetchreq.verbosity = verbosity;
575 	TAILQ_FOREACH(pe, have_refs, entry)
576 		fetchreq.n_have_refs++;
577 	TAILQ_FOREACH(pe, wanted_branches, entry)
578 		fetchreq.n_wanted_branches++;
579 	TAILQ_FOREACH(pe, wanted_refs, entry)
580 		fetchreq.n_wanted_refs++;
581 	len = sizeof(struct got_imsg_fetch_request);
582 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
583 		close(fd);
584 		return got_error(GOT_ERR_NO_SPACE);
585 	}
586 
587 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
588 	    &fetchreq, sizeof(fetchreq)) == -1)
589 		return got_error_from_errno(
590 		    "imsg_compose FETCH_SERVER_PROGRESS");
591 
592 	err = flush_imsg(ibuf);
593 	if (err) {
594 		close(fd);
595 		return err;
596 	}
597 	fd = -1;
598 
599 	TAILQ_FOREACH(pe, have_refs, entry) {
600 		const char *name = pe->path;
601 		size_t name_len = pe->path_len;
602 		struct got_object_id *id = pe->data;
603 
604 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
605 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
606 		if (wbuf == NULL)
607 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
608 
609 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
610 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
611 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
612 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
613 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
614 		if (imsg_add(wbuf, name, name_len) == -1)
615 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
616 
617 		wbuf->fd = -1;
618 		imsg_close(ibuf, wbuf);
619 		err = flush_imsg(ibuf);
620 		if (err)
621 			return err;
622 	}
623 
624 	TAILQ_FOREACH(pe, wanted_branches, entry) {
625 		const char *name = pe->path;
626 		size_t name_len = pe->path_len;
627 
628 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
629 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
630 		    len);
631 		if (wbuf == NULL)
632 			return got_error_from_errno(
633 			    "imsg_create FETCH_WANTED_BRANCH");
634 
635 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
636 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
637 			return got_error_from_errno(
638 			    "imsg_add FETCH_WANTED_BRANCH");
639 		if (imsg_add(wbuf, name, name_len) == -1)
640 			return got_error_from_errno(
641 			    "imsg_add FETCH_WANTED_BRANCH");
642 
643 		wbuf->fd = -1;
644 		imsg_close(ibuf, wbuf);
645 		err = flush_imsg(ibuf);
646 		if (err)
647 			return err;
648 	}
649 
650 	TAILQ_FOREACH(pe, wanted_refs, entry) {
651 		const char *name = pe->path;
652 		size_t name_len = pe->path_len;
653 
654 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
655 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
656 		    len);
657 		if (wbuf == NULL)
658 			return got_error_from_errno(
659 			    "imsg_create FETCH_WANTED_REF");
660 
661 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
662 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
663 			return got_error_from_errno(
664 			    "imsg_add FETCH_WANTED_REF");
665 		if (imsg_add(wbuf, name, name_len) == -1)
666 			return got_error_from_errno(
667 			    "imsg_add FETCH_WANTED_REF");
668 
669 		wbuf->fd = -1;
670 		imsg_close(ibuf, wbuf);
671 		err = flush_imsg(ibuf);
672 		if (err)
673 			return err;
674 	}
675 
676 
677 	return NULL;
678 
679 }
680 
681 const struct got_error *
682 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
683 {
684 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
685 }
686 
687 const struct got_error *
688 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
689     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
690     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
691 {
692 	const struct got_error *err = NULL;
693 	struct imsg imsg;
694 	size_t datalen;
695 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
696 	size_t n, remain;
697 	off_t off;
698 	int i;
699 
700 	*done = 0;
701 	*id = NULL;
702 	*refname = NULL;
703 	*server_progress = NULL;
704 	*packfile_size = 0;
705 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
706 
707 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
708 	if (err)
709 		return err;
710 
711 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
712 	switch (imsg.hdr.type) {
713 	case GOT_IMSG_FETCH_SYMREFS:
714 		if (datalen < sizeof(*isymrefs)) {
715 			err = got_error(GOT_ERR_PRIVSEP_LEN);
716 			break;
717 		}
718 		if (isymrefs != NULL) {
719 			err = got_error(GOT_ERR_PRIVSEP_MSG);
720 			break;
721 		}
722 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
723 		off = sizeof(*isymrefs);
724 		remain = datalen - off;
725 		for (n = 0; n < isymrefs->nsymrefs; n++) {
726 			struct got_imsg_fetch_symref *s;
727 			char *name, *target;
728 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
729 				err = got_error(GOT_ERR_PRIVSEP_LEN);
730 				goto done;
731 			}
732 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
733 			off += sizeof(*s);
734 			remain -= sizeof(*s);
735 			if (remain < s->name_len) {
736 				err = got_error(GOT_ERR_PRIVSEP_LEN);
737 				goto done;
738 			}
739 			name = strndup(imsg.data + off, s->name_len);
740 			if (name == NULL) {
741 				err = got_error_from_errno("strndup");
742 				goto done;
743 			}
744 			off += s->name_len;
745 			remain -= s->name_len;
746 			if (remain < s->target_len) {
747 				err = got_error(GOT_ERR_PRIVSEP_LEN);
748 				free(name);
749 				goto done;
750 			}
751 			target = strndup(imsg.data + off, s->target_len);
752 			if (target == NULL) {
753 				err = got_error_from_errno("strndup");
754 				free(name);
755 				goto done;
756 			}
757 			off += s->target_len;
758 			remain -= s->target_len;
759 			err = got_pathlist_append(symrefs, name, target);
760 			if (err) {
761 				free(name);
762 				free(target);
763 				goto done;
764 			}
765 		}
766 		break;
767 	case GOT_IMSG_FETCH_REF:
768 		if (datalen <= SHA1_DIGEST_LENGTH) {
769 			err = got_error(GOT_ERR_PRIVSEP_MSG);
770 			break;
771 		}
772 		*id = malloc(sizeof(**id));
773 		if (*id == NULL) {
774 			err = got_error_from_errno("malloc");
775 			break;
776 		}
777 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
778 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
779 		    datalen - SHA1_DIGEST_LENGTH);
780 		if (*refname == NULL) {
781 			err = got_error_from_errno("strndup");
782 			break;
783 		}
784 		break;
785 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
786 		if (datalen == 0) {
787 			err = got_error(GOT_ERR_PRIVSEP_LEN);
788 			break;
789 		}
790 		*server_progress = strndup(imsg.data, datalen);
791 		if (*server_progress == NULL) {
792 			err = got_error_from_errno("strndup");
793 			break;
794 		}
795 		for (i = 0; i < datalen; i++) {
796 			if (!isprint((unsigned char)(*server_progress)[i]) &&
797 			    !isspace((unsigned char)(*server_progress)[i])) {
798 				err = got_error(GOT_ERR_PRIVSEP_MSG);
799 				free(*server_progress);
800 				*server_progress = NULL;
801 				goto done;
802 			}
803 		}
804 		break;
805 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
806 		if (datalen < sizeof(*packfile_size)) {
807 			err = got_error(GOT_ERR_PRIVSEP_MSG);
808 			break;
809 		}
810 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
811 		break;
812 	case GOT_IMSG_FETCH_DONE:
813 		if (datalen != SHA1_DIGEST_LENGTH) {
814 			err = got_error(GOT_ERR_PRIVSEP_MSG);
815 			break;
816 		}
817 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
818 		*done = 1;
819 		break;
820 	default:
821 		err = got_error(GOT_ERR_PRIVSEP_MSG);
822 		break;
823 	}
824 done:
825 	if (err) {
826 		free(*id);
827 		*id = NULL;
828 		free(*refname);
829 		*refname = NULL;
830 	}
831 	imsg_free(&imsg);
832 	return err;
833 }
834 
835 static const struct got_error *
836 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
837     int delete, struct imsgbuf *ibuf)
838 {
839 	size_t len;
840 	struct ibuf *wbuf;
841 
842 	len = sizeof(struct got_imsg_send_ref) + name_len;
843 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
844 	if (wbuf == NULL)
845 		return got_error_from_errno("imsg_create SEND_REF");
846 
847 	/* Keep in sync with struct got_imsg_send_ref! */
848 	if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
849 		return got_error_from_errno("imsg_add SEND_REF");
850 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
851 		return got_error_from_errno("imsg_add SEND_REF");
852 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
853 		return got_error_from_errno("imsg_add SEND_REF");
854 	if (imsg_add(wbuf, name, name_len) == -1)
855 		return got_error_from_errno("imsg_add SEND_REF");
856 
857 	wbuf->fd = -1;
858 	imsg_close(ibuf, wbuf);
859 	return flush_imsg(ibuf);
860 }
861 
862 const struct got_error *
863 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
864     struct got_pathlist_head *have_refs,
865     struct got_pathlist_head *delete_refs,
866     int verbosity)
867 {
868 	const struct got_error *err = NULL;
869 	struct got_pathlist_entry *pe;
870 	struct got_imsg_send_request sendreq;
871 	struct got_object_id zero_id;
872 
873 	memset(&zero_id, 0, sizeof(zero_id));
874 	memset(&sendreq, 0, sizeof(sendreq));
875 	sendreq.verbosity = verbosity;
876 	TAILQ_FOREACH(pe, have_refs, entry)
877 		sendreq.nrefs++;
878 	TAILQ_FOREACH(pe, delete_refs, entry)
879 		sendreq.nrefs++;
880 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
881 	    &sendreq, sizeof(sendreq)) == -1) {
882 		err = got_error_from_errno(
883 		    "imsg_compose FETCH_SERVER_PROGRESS");
884 		goto done;
885 	}
886 
887 	err = flush_imsg(ibuf);
888 	if (err)
889 		goto done;
890 	fd = -1;
891 
892 	TAILQ_FOREACH(pe, have_refs, entry) {
893 		const char *name = pe->path;
894 		size_t name_len = pe->path_len;
895 		struct got_object_id *id = pe->data;
896 		err = send_send_ref(name, name_len, id, 0, ibuf);
897 		if (err)
898 			goto done;
899 	}
900 
901 	TAILQ_FOREACH(pe, delete_refs, entry) {
902 		const char *name = pe->path;
903 		size_t name_len = pe->path_len;
904 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
905 		if (err)
906 			goto done;
907 	}
908 done:
909 	if (fd != -1 && close(fd) == -1 && err == NULL)
910 		err = got_error_from_errno("close");
911 	return err;
912 
913 }
914 
915 const struct got_error *
916 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
917     struct imsgbuf *ibuf)
918 {
919 	const struct got_error *err = NULL;
920 	struct imsg imsg;
921 	size_t datalen;
922 	int done = 0;
923 	struct got_imsg_send_remote_ref iremote_ref;
924 	struct got_object_id *id = NULL;
925 	char *refname = NULL;
926 	struct got_pathlist_entry *new;
927 
928 	while (!done) {
929 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
930 		if (err)
931 			return err;
932 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
933 		switch (imsg.hdr.type) {
934 		case GOT_IMSG_SEND_REMOTE_REF:
935 			if (datalen < sizeof(iremote_ref)) {
936 				err = got_error(GOT_ERR_PRIVSEP_MSG);
937 				goto done;
938 			}
939 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
940 			if (datalen != sizeof(iremote_ref) +
941 			    iremote_ref.name_len) {
942 				err = got_error(GOT_ERR_PRIVSEP_MSG);
943 				goto done;
944 			}
945 			id = malloc(sizeof(*id));
946 			if (id == NULL) {
947 				err = got_error_from_errno("malloc");
948 				goto done;
949 			}
950 			memcpy(id->sha1, iremote_ref.id, SHA1_DIGEST_LENGTH);
951 			refname = strndup(imsg.data + sizeof(iremote_ref),
952 			    datalen - sizeof(iremote_ref));
953 			if (refname == NULL) {
954 				err = got_error_from_errno("strndup");
955 				goto done;
956 			}
957 			err = got_pathlist_insert(&new, remote_refs,
958 			    refname, id);
959 			if (err)
960 				goto done;
961 			if (new == NULL) { /* duplicate which wasn't inserted */
962 				free(id);
963 				free(refname);
964 			}
965 			id = NULL;
966 			refname = NULL;
967 			break;
968 		case GOT_IMSG_SEND_PACK_REQUEST:
969 			if (datalen != 0) {
970 				err = got_error(GOT_ERR_PRIVSEP_MSG);
971 				goto done;
972 			}
973 			/* got-send-pack is now waiting for a pack file. */
974 			done = 1;
975 			break;
976 		default:
977 			err = got_error(GOT_ERR_PRIVSEP_MSG);
978 			break;
979 		}
980 	}
981 done:
982 	free(id);
983 	free(refname);
984 	imsg_free(&imsg);
985 	return err;
986 }
987 
988 const struct got_error *
989 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
990 {
991 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
992 }
993 
994 const struct got_error *
995 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
996     int *success, char **refname, struct imsgbuf *ibuf)
997 {
998 	const struct got_error *err = NULL;
999 	struct imsg imsg;
1000 	size_t datalen;
1001 	struct got_imsg_send_ref_status iref_status;
1002 
1003 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1004 	*done = 0;
1005 	*success = 0;
1006 	*refname = NULL;
1007 
1008 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1009 	if (err)
1010 		return err;
1011 
1012 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1013 	switch (imsg.hdr.type) {
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_IDXPACK_PROGRESS:
1095 		if (datalen < sizeof(*iprogress)) {
1096 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1097 			break;
1098 		}
1099 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1100 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1101 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1102 			err = got_error(GOT_ERR_RANGE);
1103 			break;
1104 		}
1105 		*nobj_total = iprogress->nobj_total;
1106 		*nobj_indexed = iprogress->nobj_indexed;
1107 		*nobj_loose = iprogress->nobj_loose;
1108 		*nobj_resolved = iprogress->nobj_resolved;
1109 		break;
1110 	case GOT_IMSG_IDXPACK_DONE:
1111 		if (datalen != 0) {
1112 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1113 			break;
1114 		}
1115 		*done = 1;
1116 		break;
1117 	default:
1118 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1119 		break;
1120 	}
1121 
1122 	imsg_free(&imsg);
1123 	return err;
1124 }
1125 
1126 const struct got_error *
1127 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1128     struct imsgbuf *ibuf)
1129 {
1130 	struct got_imsg_object *iobj;
1131 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1132 
1133 	if (datalen != sizeof(*iobj))
1134 		return got_error(GOT_ERR_PRIVSEP_LEN);
1135 	iobj = imsg->data;
1136 
1137 	if (iobj->pack_offset < 0)
1138 		return got_error(GOT_ERR_PACK_OFFSET);
1139 
1140 	*obj = calloc(1, sizeof(**obj));
1141 	if (*obj == NULL)
1142 		return got_error_from_errno("calloc");
1143 
1144 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1145 	(*obj)->type = iobj->type;
1146 	(*obj)->flags = iobj->flags;
1147 	(*obj)->hdrlen = iobj->hdrlen;
1148 	(*obj)->size = iobj->size;
1149 	/* path_packfile is handled by caller */
1150 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1151 		(*obj)->pack_offset = iobj->pack_offset;
1152 		(*obj)->pack_idx = iobj->pack_idx;
1153 	}
1154 	STAILQ_INIT(&(*obj)->deltas.entries);
1155 	return NULL;
1156 }
1157 
1158 const struct got_error *
1159 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1160 {
1161 	const struct got_error *err = NULL;
1162 	struct imsg imsg;
1163 	const size_t min_datalen =
1164 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1165 
1166 	*obj = NULL;
1167 
1168 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1169 	if (err)
1170 		return err;
1171 
1172 	switch (imsg.hdr.type) {
1173 	case GOT_IMSG_OBJECT:
1174 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1175 		break;
1176 	default:
1177 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1178 		break;
1179 	}
1180 
1181 	imsg_free(&imsg);
1182 
1183 	return err;
1184 }
1185 
1186 static const struct got_error *
1187 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1188     size_t logmsg_len)
1189 {
1190 	const struct got_error *err = NULL;
1191 	size_t offset, remain;
1192 
1193 	offset = 0;
1194 	remain = logmsg_len;
1195 	while (remain > 0) {
1196 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1197 
1198 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1199 		    commit->logmsg + offset, n) == -1) {
1200 			err = got_error_from_errno("imsg_compose "
1201 			    "COMMIT_LOGMSG");
1202 			break;
1203 		}
1204 
1205 		err = flush_imsg(ibuf);
1206 		if (err)
1207 			break;
1208 
1209 		offset += n;
1210 		remain -= n;
1211 	}
1212 
1213 	return err;
1214 }
1215 
1216 const struct got_error *
1217 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1218 {
1219 	const struct got_error *err = NULL;
1220 	struct got_imsg_commit_object *icommit;
1221 	uint8_t *buf;
1222 	size_t len, total;
1223 	struct got_object_qid *qid;
1224 	size_t author_len = strlen(commit->author);
1225 	size_t committer_len = strlen(commit->committer);
1226 	size_t logmsg_len = strlen(commit->logmsg);
1227 
1228 	total = sizeof(*icommit) + author_len + committer_len +
1229 	    commit->nparents * SHA1_DIGEST_LENGTH;
1230 
1231 	buf = malloc(total);
1232 	if (buf == NULL)
1233 		return got_error_from_errno("malloc");
1234 
1235 	icommit = (struct got_imsg_commit_object *)buf;
1236 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1237 	    sizeof(icommit->tree_id));
1238 	icommit->author_len = author_len;
1239 	icommit->author_time = commit->author_time;
1240 	icommit->author_gmtoff = commit->author_gmtoff;
1241 	icommit->committer_len = committer_len;
1242 	icommit->committer_time = commit->committer_time;
1243 	icommit->committer_gmtoff = commit->committer_gmtoff;
1244 	icommit->logmsg_len = logmsg_len;
1245 	icommit->nparents = commit->nparents;
1246 
1247 	len = sizeof(*icommit);
1248 	memcpy(buf + len, commit->author, author_len);
1249 	len += author_len;
1250 	memcpy(buf + len, commit->committer, committer_len);
1251 	len += committer_len;
1252 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1253 		memcpy(buf + len, &qid->id, SHA1_DIGEST_LENGTH);
1254 		len += SHA1_DIGEST_LENGTH;
1255 	}
1256 
1257 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1258 		err = got_error_from_errno("imsg_compose COMMIT");
1259 		goto done;
1260 	}
1261 
1262 	if (logmsg_len == 0 ||
1263 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1264 		err = flush_imsg(ibuf);
1265 		if (err)
1266 			goto done;
1267 	}
1268 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1269 done:
1270 	free(buf);
1271 	return err;
1272 }
1273 
1274 static const struct got_error *
1275 get_commit_from_imsg(struct got_commit_object **commit,
1276     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1277 {
1278 	const struct got_error *err = NULL;
1279 	struct got_imsg_commit_object *icommit;
1280 	size_t len = 0;
1281 	int i;
1282 
1283 	if (datalen < sizeof(*icommit))
1284 		return got_error(GOT_ERR_PRIVSEP_LEN);
1285 
1286 	icommit = imsg->data;
1287 	if (datalen != sizeof(*icommit) + icommit->author_len +
1288 	    icommit->committer_len +
1289 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1290 		return got_error(GOT_ERR_PRIVSEP_LEN);
1291 
1292 	if (icommit->nparents < 0)
1293 		return got_error(GOT_ERR_PRIVSEP_LEN);
1294 
1295 	len += sizeof(*icommit);
1296 
1297 	*commit = got_object_commit_alloc_partial();
1298 	if (*commit == NULL)
1299 		return got_error_from_errno(
1300 		    "got_object_commit_alloc_partial");
1301 
1302 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1303 	    SHA1_DIGEST_LENGTH);
1304 	(*commit)->author_time = icommit->author_time;
1305 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1306 	(*commit)->committer_time = icommit->committer_time;
1307 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1308 
1309 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1310 	if ((*commit)->author == NULL) {
1311 		err = got_error_from_errno("strndup");
1312 		goto done;
1313 	}
1314 	len += icommit->author_len;
1315 
1316 	(*commit)->committer = strndup(imsg->data + len,
1317 	    icommit->committer_len);
1318 	if ((*commit)->committer == NULL) {
1319 		err = got_error_from_errno("strndup");
1320 		goto done;
1321 	}
1322 	len += icommit->committer_len;
1323 
1324 	if (icommit->logmsg_len == 0) {
1325 		(*commit)->logmsg = strdup("");
1326 		if ((*commit)->logmsg == NULL) {
1327 			err = got_error_from_errno("strdup");
1328 			goto done;
1329 		}
1330 	} else {
1331 		size_t offset = 0, remain = icommit->logmsg_len;
1332 
1333 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1334 		if ((*commit)->logmsg == NULL) {
1335 			err = got_error_from_errno("malloc");
1336 			goto done;
1337 		}
1338 		while (remain > 0) {
1339 			struct imsg imsg_log;
1340 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1341 			    remain);
1342 
1343 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1344 			if (err)
1345 				goto done;
1346 
1347 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1348 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1349 				goto done;
1350 			}
1351 
1352 			memcpy((*commit)->logmsg + offset,
1353 			    imsg_log.data, n);
1354 			imsg_free(&imsg_log);
1355 			offset += n;
1356 			remain -= n;
1357 		}
1358 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1359 	}
1360 
1361 	for (i = 0; i < icommit->nparents; i++) {
1362 		struct got_object_qid *qid;
1363 
1364 		err = got_object_qid_alloc_partial(&qid);
1365 		if (err)
1366 			break;
1367 		memcpy(&qid->id, imsg->data + len +
1368 		    i * SHA1_DIGEST_LENGTH, sizeof(qid->id));
1369 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1370 		(*commit)->nparents++;
1371 	}
1372 done:
1373 	if (err) {
1374 		got_object_commit_close(*commit);
1375 		*commit = NULL;
1376 	}
1377 	return err;
1378 }
1379 
1380 const struct got_error *
1381 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1382 {
1383 	const struct got_error *err = NULL;
1384 	struct imsg imsg;
1385 	size_t datalen;
1386 	const size_t min_datalen =
1387 	    MIN(sizeof(struct got_imsg_error),
1388 	    sizeof(struct got_imsg_commit_object));
1389 
1390 	*commit = NULL;
1391 
1392 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1393 	if (err)
1394 		return err;
1395 
1396 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1397 
1398 	switch (imsg.hdr.type) {
1399 	case GOT_IMSG_COMMIT:
1400 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1401 		break;
1402 	default:
1403 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1404 		break;
1405 	}
1406 
1407 	imsg_free(&imsg);
1408 
1409 	return err;
1410 }
1411 
1412 static const struct got_error *
1413 send_tree_entries_batch(struct imsgbuf *ibuf,
1414     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1415 {
1416 	struct ibuf *wbuf;
1417 	struct got_imsg_tree_entries ientries;
1418 	int i;
1419 
1420 	memset(&ientries, 0, sizeof(ientries));
1421 
1422 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1423 	if (wbuf == NULL)
1424 		return got_error_from_errno("imsg_create TREE_ENTRY");
1425 
1426 	ientries.nentries = idxN - idx0 + 1;
1427 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1428 		return got_error_from_errno("imsg_add TREE_ENTRY");
1429 
1430 	for (i = idx0; i <= idxN; i++) {
1431 		struct got_parsed_tree_entry *pte = &entries[i];
1432 
1433 		/* Keep in sync with struct got_imsg_tree_object definition! */
1434 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1435 			return got_error_from_errno("imsg_add TREE_ENTRY");
1436 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1437 			return got_error_from_errno("imsg_add TREE_ENTRY");
1438 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1439 			return got_error_from_errno("imsg_add TREE_ENTRY");
1440 
1441 		/* Remaining bytes are the entry's name. */
1442 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1443 			return got_error_from_errno("imsg_add TREE_ENTRY");
1444 	}
1445 
1446 	wbuf->fd = -1;
1447 	imsg_close(ibuf, wbuf);
1448 	return NULL;
1449 }
1450 
1451 static const struct got_error *
1452 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1453     int nentries)
1454 {
1455 	const struct got_error *err = NULL;
1456 	int i, j;
1457 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1458 
1459 	i = 0;
1460 	for (j = 0; j < nentries; j++) {
1461 		struct got_parsed_tree_entry *pte = &entries[j];
1462 		size_t len = SHA1_DIGEST_LENGTH + sizeof(pte->mode) +
1463 		    sizeof(pte->namelen) + 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 	memset(&itree, 0, sizeof(itree));
1496 	itree.nentries = nentries;
1497 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1498 	    == -1)
1499 		return got_error_from_errno("imsg_compose TREE");
1500 
1501 	err = send_tree_entries(ibuf, entries, nentries);
1502 	if (err)
1503 		return err;
1504 
1505 	return flush_imsg(ibuf);
1506 }
1507 
1508 
1509 static const struct got_error *
1510 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1511     int *nentries)
1512 {
1513 	const struct got_error *err = NULL;
1514 	struct got_imsg_tree_entries *ientries;
1515 	struct got_tree_entry *te;
1516 	size_t te_offset;
1517 	size_t i;
1518 
1519 	if (datalen <= sizeof(*ientries) ||
1520 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1521 		return got_error(GOT_ERR_PRIVSEP_LEN);
1522 
1523 	ientries = (struct got_imsg_tree_entries *)data;
1524 	if (ientries->nentries > INT_MAX) {
1525 		return got_error_msg(GOT_ERR_NO_SPACE,
1526 		    "too many tree entries");
1527 	}
1528 
1529 	te_offset = sizeof(*ientries);
1530 	for (i = 0; i < ientries->nentries; i++) {
1531 		struct got_imsg_tree_entry ite;
1532 		const char *te_name;
1533 		uint8_t *buf = (uint8_t *)data + te_offset;
1534 
1535 		if (te_offset >= datalen) {
1536 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1537 			break;
1538 		}
1539 
1540 		/* Might not be aligned, size is ~32 bytes. */
1541 		memcpy(&ite, buf, sizeof(ite));
1542 
1543 		if (ite.namelen >= sizeof(te->name)) {
1544 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1545 			break;
1546 		}
1547 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1548 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1549 			break;
1550 		}
1551 
1552 		if (*nentries >= tree->nentries) {
1553 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1554 			break;
1555 		}
1556 		te = &tree->entries[*nentries];
1557 		te_name = buf + sizeof(ite);
1558 		memcpy(te->name, te_name, ite.namelen);
1559 		te->name[ite.namelen] = '\0';
1560 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1561 		te->mode = ite.mode;
1562 		te->idx = *nentries;
1563 		(*nentries)++;
1564 
1565 		te_offset += sizeof(ite) + ite.namelen;
1566 	}
1567 
1568 	return err;
1569 }
1570 
1571 const struct got_error *
1572 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1573 {
1574 	const struct got_error *err = NULL;
1575 	const size_t min_datalen =
1576 	    MIN(sizeof(struct got_imsg_error),
1577 	    sizeof(struct got_imsg_tree_object));
1578 	struct got_imsg_tree_object *itree;
1579 	int nentries = 0;
1580 
1581 	*tree = NULL;
1582 
1583 	while (*tree == NULL || nentries < (*tree)->nentries) {
1584 		struct imsg imsg;
1585 		size_t datalen;
1586 
1587 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1588 		if (err)
1589 			break;
1590 
1591 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1592 
1593 		switch (imsg.hdr.type) {
1594 		case GOT_IMSG_TREE:
1595 			/* This message should only appear once. */
1596 			if (*tree != NULL) {
1597 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1598 				break;
1599 			}
1600 			if (datalen != sizeof(*itree)) {
1601 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1602 				break;
1603 			}
1604 			itree = imsg.data;
1605 			if (itree->nentries < 0) {
1606 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1607 				break;
1608 			}
1609 			*tree = malloc(sizeof(**tree));
1610 			if (*tree == NULL) {
1611 				err = got_error_from_errno("malloc");
1612 				break;
1613 			}
1614 			(*tree)->entries = calloc(itree->nentries,
1615 			    sizeof(struct got_tree_entry));
1616 			if ((*tree)->entries == NULL) {
1617 				err = got_error_from_errno("malloc");
1618 				free(*tree);
1619 				*tree = NULL;
1620 				break;
1621 			}
1622 			(*tree)->nentries = itree->nentries;
1623 			(*tree)->refcnt = 0;
1624 			break;
1625 		case GOT_IMSG_TREE_ENTRIES:
1626 			/* This message should be preceeded by GOT_IMSG_TREE. */
1627 			if (*tree == NULL) {
1628 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1629 				break;
1630 			}
1631 			err = recv_tree_entries(imsg.data, datalen,
1632 			    *tree, &nentries);
1633 			break;
1634 		default:
1635 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1636 			break;
1637 		}
1638 
1639 		imsg_free(&imsg);
1640 		if (err)
1641 			break;
1642 	}
1643 
1644 	if (*tree && (*tree)->nentries != nentries) {
1645 		if (err == NULL)
1646 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1647 		got_object_tree_close(*tree);
1648 		*tree = NULL;
1649 	}
1650 
1651 	return err;
1652 }
1653 
1654 const struct got_error *
1655 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1656     const uint8_t *data)
1657 {
1658 	struct got_imsg_blob iblob;
1659 
1660 	memset(&iblob, 0, sizeof(iblob));
1661 	iblob.size = size;
1662 	iblob.hdrlen = hdrlen;
1663 
1664 	if (data) {
1665 		uint8_t *buf;
1666 
1667 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1668 			return got_error(GOT_ERR_NO_SPACE);
1669 
1670 		buf = malloc(sizeof(iblob) + size);
1671 		if (buf == NULL)
1672 			return got_error_from_errno("malloc");
1673 
1674 		memcpy(buf, &iblob, sizeof(iblob));
1675 		memcpy(buf + sizeof(iblob), data, size);
1676 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1677 		    sizeof(iblob) + size) == -1) {
1678 			free(buf);
1679 			return got_error_from_errno("imsg_compose BLOB");
1680 		}
1681 		free(buf);
1682 	} else {
1683 		/* Data has already been written to file descriptor. */
1684 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1685 		    sizeof(iblob)) == -1)
1686 			return got_error_from_errno("imsg_compose BLOB");
1687 	}
1688 
1689 
1690 	return flush_imsg(ibuf);
1691 }
1692 
1693 const struct got_error *
1694 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1695     struct imsgbuf *ibuf)
1696 {
1697 	const struct got_error *err = NULL;
1698 	struct imsg imsg;
1699 	struct got_imsg_blob *iblob;
1700 	size_t datalen;
1701 
1702 	*outbuf = NULL;
1703 
1704 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1705 	if (err)
1706 		return err;
1707 
1708 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1709 
1710 	switch (imsg.hdr.type) {
1711 	case GOT_IMSG_BLOB:
1712 		if (datalen < sizeof(*iblob)) {
1713 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1714 			break;
1715 		}
1716 		iblob = imsg.data;
1717 		*size = iblob->size;
1718 		*hdrlen = iblob->hdrlen;
1719 
1720 		if (datalen == sizeof(*iblob)) {
1721 			/* Data has been written to file descriptor. */
1722 			break;
1723 		}
1724 
1725 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1726 		    *size > datalen + sizeof(*iblob)) {
1727 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1728 			break;
1729 		}
1730 
1731 		*outbuf = malloc(*size);
1732 		if (*outbuf == NULL) {
1733 			err = got_error_from_errno("malloc");
1734 			break;
1735 		}
1736 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1737 		break;
1738 	default:
1739 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1740 		break;
1741 	}
1742 
1743 	imsg_free(&imsg);
1744 
1745 	return err;
1746 }
1747 
1748 static const struct got_error *
1749 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1750 {
1751 	const struct got_error *err = NULL;
1752 	size_t offset, remain;
1753 
1754 	offset = 0;
1755 	remain = tagmsg_len;
1756 	while (remain > 0) {
1757 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1758 
1759 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1760 		    tag->tagmsg + offset, n) == -1) {
1761 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1762 			break;
1763 		}
1764 
1765 		err = flush_imsg(ibuf);
1766 		if (err)
1767 			break;
1768 
1769 		offset += n;
1770 		remain -= n;
1771 	}
1772 
1773 	return err;
1774 }
1775 
1776 const struct got_error *
1777 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1778 {
1779 	const struct got_error *err = NULL;
1780 	struct got_imsg_tag_object *itag;
1781 	uint8_t *buf;
1782 	size_t len, total;
1783 	size_t tag_len = strlen(tag->tag);
1784 	size_t tagger_len = strlen(tag->tagger);
1785 	size_t tagmsg_len = strlen(tag->tagmsg);
1786 
1787 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1788 
1789 	buf = malloc(total);
1790 	if (buf == NULL)
1791 		return got_error_from_errno("malloc");
1792 
1793 	itag = (struct got_imsg_tag_object *)buf;
1794 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1795 	itag->obj_type = tag->obj_type;
1796 	itag->tag_len = tag_len;
1797 	itag->tagger_len = tagger_len;
1798 	itag->tagger_time = tag->tagger_time;
1799 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1800 	itag->tagmsg_len = tagmsg_len;
1801 
1802 	len = sizeof(*itag);
1803 	memcpy(buf + len, tag->tag, tag_len);
1804 	len += tag_len;
1805 	memcpy(buf + len, tag->tagger, tagger_len);
1806 	len += tagger_len;
1807 
1808 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1809 		err = got_error_from_errno("imsg_compose TAG");
1810 		goto done;
1811 	}
1812 
1813 	if (tagmsg_len == 0 ||
1814 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1815 		err = flush_imsg(ibuf);
1816 		if (err)
1817 			goto done;
1818 	}
1819 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1820 done:
1821 	free(buf);
1822 	return err;
1823 }
1824 
1825 const struct got_error *
1826 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1827 {
1828 	const struct got_error *err = NULL;
1829 	struct imsg imsg;
1830 	struct got_imsg_tag_object *itag;
1831 	size_t len, datalen;
1832 	const size_t min_datalen =
1833 	    MIN(sizeof(struct got_imsg_error),
1834 	    sizeof(struct got_imsg_tag_object));
1835 
1836 	*tag = NULL;
1837 
1838 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1839 	if (err)
1840 		return err;
1841 
1842 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1843 	len = 0;
1844 
1845 	switch (imsg.hdr.type) {
1846 	case GOT_IMSG_TAG:
1847 		if (datalen < sizeof(*itag)) {
1848 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1849 			break;
1850 		}
1851 		itag = imsg.data;
1852 		if (datalen != sizeof(*itag) + itag->tag_len +
1853 		    itag->tagger_len) {
1854 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1855 			break;
1856 		}
1857 		len += sizeof(*itag);
1858 
1859 		*tag = calloc(1, sizeof(**tag));
1860 		if (*tag == NULL) {
1861 			err = got_error_from_errno("calloc");
1862 			break;
1863 		}
1864 
1865 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1866 
1867 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1868 		if ((*tag)->tag == NULL) {
1869 			err = got_error_from_errno("strndup");
1870 			break;
1871 		}
1872 		len += itag->tag_len;
1873 
1874 		(*tag)->obj_type = itag->obj_type;
1875 		(*tag)->tagger_time = itag->tagger_time;
1876 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1877 
1878 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1879 		if ((*tag)->tagger == NULL) {
1880 			err = got_error_from_errno("strndup");
1881 			break;
1882 		}
1883 		len += itag->tagger_len;
1884 
1885 		if (itag->tagmsg_len == 0) {
1886 			(*tag)->tagmsg = strdup("");
1887 			if ((*tag)->tagmsg == NULL) {
1888 				err = got_error_from_errno("strdup");
1889 				break;
1890 			}
1891 		} else {
1892 			size_t offset = 0, remain = itag->tagmsg_len;
1893 
1894 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1895 			if ((*tag)->tagmsg == NULL) {
1896 				err = got_error_from_errno("malloc");
1897 				break;
1898 			}
1899 			while (remain > 0) {
1900 				struct imsg imsg_log;
1901 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1902 				    remain);
1903 
1904 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1905 				if (err)
1906 					return err;
1907 
1908 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1909 					return got_error(GOT_ERR_PRIVSEP_MSG);
1910 
1911 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1912 				    n);
1913 				imsg_free(&imsg_log);
1914 				offset += n;
1915 				remain -= n;
1916 			}
1917 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1918 		}
1919 
1920 		break;
1921 	default:
1922 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1923 		break;
1924 	}
1925 
1926 	imsg_free(&imsg);
1927 
1928 	return err;
1929 }
1930 
1931 const struct got_error *
1932 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1933     struct got_packidx *packidx)
1934 {
1935 	const struct got_error *err = NULL;
1936 	struct got_imsg_packidx ipackidx;
1937 	struct got_imsg_pack ipack;
1938 	int fd;
1939 
1940 	memset(&ipackidx, 0, sizeof(ipackidx));
1941 	memset(&ipack, 0, sizeof(ipack));
1942 
1943 	ipackidx.len = packidx->len;
1944 	ipackidx.packfile_size = pack->filesize;
1945 	fd = dup(packidx->fd);
1946 	if (fd == -1)
1947 		return got_error_from_errno("dup");
1948 
1949 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1950 	    sizeof(ipackidx)) == -1) {
1951 		err = got_error_from_errno("imsg_compose PACKIDX");
1952 		close(fd);
1953 		return err;
1954 	}
1955 
1956 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1957 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1958 		return got_error(GOT_ERR_NO_SPACE);
1959 	ipack.filesize = pack->filesize;
1960 
1961 	fd = dup(pack->fd);
1962 	if (fd == -1)
1963 		return got_error_from_errno("dup");
1964 
1965 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1966 	    == -1) {
1967 		err = got_error_from_errno("imsg_compose PACK");
1968 		close(fd);
1969 		return err;
1970 	}
1971 
1972 	return flush_imsg(ibuf);
1973 }
1974 
1975 const struct got_error *
1976 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1977     struct got_object_id *id)
1978 {
1979 	struct got_imsg_packed_object iobj;
1980 
1981 	memset(&iobj, 0, sizeof(iobj));
1982 	iobj.idx = idx;
1983 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1984 
1985 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1986 	    &iobj, sizeof(iobj)) == -1)
1987 		return got_error_from_errno("imsg_compose "
1988 		    "PACKED_OBJECT_REQUEST");
1989 
1990 	return flush_imsg(ibuf);
1991 }
1992 
1993 const struct got_error *
1994 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1995     struct got_object_id *id)
1996 {
1997 	struct got_imsg_packed_object iobj;
1998 
1999 	memset(&iobj, 0, sizeof(iobj));
2000 	iobj.idx = idx;
2001 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2002 
2003 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2004 	    &iobj, sizeof(iobj)) == -1)
2005 		return got_error_from_errno("imsg_compose "
2006 		    "PACKED_OBJECT_REQUEST");
2007 
2008 	return flush_imsg(ibuf);
2009 }
2010 
2011 const struct got_error *
2012 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2013 {
2014 	const struct got_error *err = NULL;
2015 
2016 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2017 	    NULL, 0) == -1) {
2018 		err = got_error_from_errno("imsg_compose "
2019 		    "GITCONFIG_PARSE_REQUEST");
2020 		close(fd);
2021 		return err;
2022 	}
2023 
2024 	return flush_imsg(ibuf);
2025 }
2026 
2027 const struct got_error *
2028 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2029 {
2030 	if (imsg_compose(ibuf,
2031 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2032 	    NULL, 0) == -1)
2033 		return got_error_from_errno("imsg_compose "
2034 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2035 
2036 	return flush_imsg(ibuf);
2037 }
2038 
2039 const struct got_error *
2040 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2041 {
2042 	if (imsg_compose(ibuf,
2043 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2044 	    NULL, 0) == -1)
2045 		return got_error_from_errno("imsg_compose "
2046 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2047 
2048 	return flush_imsg(ibuf);
2049 }
2050 
2051 
2052 const struct got_error *
2053 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2054 {
2055 	if (imsg_compose(ibuf,
2056 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2057 		return got_error_from_errno("imsg_compose "
2058 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2059 
2060 	return flush_imsg(ibuf);
2061 }
2062 
2063 const struct got_error *
2064 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2065 {
2066 	if (imsg_compose(ibuf,
2067 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2068 		return got_error_from_errno("imsg_compose "
2069 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2070 
2071 	return flush_imsg(ibuf);
2072 }
2073 
2074 const struct got_error *
2075 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2076 {
2077 	if (imsg_compose(ibuf,
2078 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2079 		return got_error_from_errno("imsg_compose "
2080 		    "GITCONFIG_REMOTE_REQUEST");
2081 
2082 	return flush_imsg(ibuf);
2083 }
2084 
2085 const struct got_error *
2086 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2087 {
2088 	if (imsg_compose(ibuf,
2089 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2090 		return got_error_from_errno("imsg_compose "
2091 		    "GITCONFIG_OWNER_REQUEST");
2092 
2093 	return flush_imsg(ibuf);
2094 }
2095 
2096 const struct got_error *
2097 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2098 {
2099 	const struct got_error *err = NULL;
2100 	struct imsg imsg;
2101 	size_t datalen;
2102 
2103 	*str = NULL;
2104 
2105 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2106 	if (err)
2107 		return err;
2108 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2109 
2110 	switch (imsg.hdr.type) {
2111 	case GOT_IMSG_GITCONFIG_STR_VAL:
2112 		if (datalen == 0)
2113 			break;
2114 		/* datalen does not include terminating \0 */
2115 		*str = malloc(datalen + 1);
2116 		if (*str == NULL) {
2117 			err = got_error_from_errno("malloc");
2118 			break;
2119 		}
2120 		memcpy(*str, imsg.data, datalen);
2121 		(*str)[datalen] = '\0';
2122 		break;
2123 	default:
2124 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2125 		break;
2126 	}
2127 
2128 	imsg_free(&imsg);
2129 	return err;
2130 }
2131 
2132 const struct got_error *
2133 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2134 {
2135 	const struct got_error *err = NULL;
2136 	struct imsg imsg;
2137 	size_t datalen;
2138 	const size_t min_datalen =
2139 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2140 
2141 	*val = 0;
2142 
2143 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2144 	if (err)
2145 		return err;
2146 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2147 
2148 	switch (imsg.hdr.type) {
2149 	case GOT_IMSG_GITCONFIG_INT_VAL:
2150 		if (datalen != sizeof(*val)) {
2151 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2152 			break;
2153 		}
2154 		memcpy(val, imsg.data, sizeof(*val));
2155 		break;
2156 	default:
2157 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2158 		break;
2159 	}
2160 
2161 	imsg_free(&imsg);
2162 	return err;
2163 }
2164 
2165 static void
2166 free_remote_data(struct got_remote_repo *remote)
2167 {
2168 	int i;
2169 
2170 	free(remote->name);
2171 	free(remote->fetch_url);
2172 	free(remote->send_url);
2173 	for (i = 0; i < remote->nfetch_branches; i++)
2174 		free(remote->fetch_branches[i]);
2175 	free(remote->fetch_branches);
2176 	for (i = 0; i < remote->nsend_branches; i++)
2177 		free(remote->send_branches[i]);
2178 	free(remote->send_branches);
2179 	for (i = 0; i < remote->nfetch_refs; i++)
2180 		free(remote->fetch_refs[i]);
2181 	free(remote->fetch_refs);
2182 }
2183 
2184 const struct got_error *
2185 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2186     int *nremotes, struct imsgbuf *ibuf)
2187 {
2188 	const struct got_error *err = NULL;
2189 	struct imsg imsg;
2190 	size_t datalen;
2191 	struct got_imsg_remotes iremotes;
2192 	struct got_imsg_remote iremote;
2193 
2194 	*remotes = NULL;
2195 	*nremotes = 0;
2196 	iremotes.nremotes = 0;
2197 
2198 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2199 	if (err)
2200 		return err;
2201 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2202 
2203 	switch (imsg.hdr.type) {
2204 	case GOT_IMSG_GITCONFIG_REMOTES:
2205 		if (datalen != sizeof(iremotes)) {
2206 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2207 			break;
2208 		}
2209 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2210 		if (iremotes.nremotes == 0) {
2211 			imsg_free(&imsg);
2212 			return NULL;
2213 		}
2214 		break;
2215 	default:
2216 		imsg_free(&imsg);
2217 		return got_error(GOT_ERR_PRIVSEP_MSG);
2218 	}
2219 
2220 	imsg_free(&imsg);
2221 
2222 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2223 	if (*remotes == NULL)
2224 		return got_error_from_errno("recallocarray");
2225 
2226 	while (*nremotes < iremotes.nremotes) {
2227 		struct got_remote_repo *remote;
2228 
2229 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2230 		if (err)
2231 			break;
2232 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2233 
2234 		switch (imsg.hdr.type) {
2235 		case GOT_IMSG_GITCONFIG_REMOTE:
2236 			remote = &(*remotes)[*nremotes];
2237 			memset(remote, 0, sizeof(*remote));
2238 			if (datalen < sizeof(iremote)) {
2239 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2240 				break;
2241 			}
2242 			memcpy(&iremote, imsg.data, sizeof(iremote));
2243 			if (iremote.name_len == 0 ||
2244 			    iremote.fetch_url_len == 0 ||
2245 			    iremote.send_url_len == 0 ||
2246 			    (sizeof(iremote) + iremote.name_len +
2247 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2248 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2249 				break;
2250 			}
2251 			remote->name = strndup(imsg.data + sizeof(iremote),
2252 			    iremote.name_len);
2253 			if (remote->name == NULL) {
2254 				err = got_error_from_errno("strndup");
2255 				break;
2256 			}
2257 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2258 			    iremote.name_len, iremote.fetch_url_len);
2259 			if (remote->fetch_url == NULL) {
2260 				err = got_error_from_errno("strndup");
2261 				free_remote_data(remote);
2262 				break;
2263 			}
2264 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2265 			    iremote.name_len + iremote.fetch_url_len,
2266 			    iremote.send_url_len);
2267 			if (remote->send_url == NULL) {
2268 				err = got_error_from_errno("strndup");
2269 				free_remote_data(remote);
2270 				break;
2271 			}
2272 			remote->mirror_references = iremote.mirror_references;
2273 			remote->fetch_all_branches = iremote.fetch_all_branches;
2274 			remote->nfetch_branches = 0;
2275 			remote->fetch_branches = NULL;
2276 			remote->nsend_branches = 0;
2277 			remote->send_branches = NULL;
2278 			remote->nfetch_refs = 0;
2279 			remote->fetch_refs = NULL;
2280 			(*nremotes)++;
2281 			break;
2282 		default:
2283 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2284 			break;
2285 		}
2286 
2287 		imsg_free(&imsg);
2288 		if (err)
2289 			break;
2290 	}
2291 
2292 	if (err) {
2293 		int i;
2294 		for (i = 0; i < *nremotes; i++)
2295 			free_remote_data(&(*remotes)[i]);
2296 		free(*remotes);
2297 		*remotes = NULL;
2298 		*nremotes = 0;
2299 	}
2300 	return err;
2301 }
2302 
2303 const struct got_error *
2304 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2305 {
2306 	const struct got_error *err = NULL;
2307 
2308 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2309 	    NULL, 0) == -1) {
2310 		err = got_error_from_errno("imsg_compose "
2311 		    "GOTCONFIG_PARSE_REQUEST");
2312 		close(fd);
2313 		return err;
2314 	}
2315 
2316 	return flush_imsg(ibuf);
2317 }
2318 
2319 const struct got_error *
2320 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2321 {
2322 	if (imsg_compose(ibuf,
2323 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2324 		return got_error_from_errno("imsg_compose "
2325 		    "GOTCONFIG_AUTHOR_REQUEST");
2326 
2327 	return flush_imsg(ibuf);
2328 }
2329 
2330 const struct got_error *
2331 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2332 {
2333 	if (imsg_compose(ibuf,
2334 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2335 		return got_error_from_errno("imsg_compose "
2336 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2337 
2338 	return flush_imsg(ibuf);
2339 }
2340 
2341 const struct got_error *
2342 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2343 {
2344 	if (imsg_compose(ibuf,
2345 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2346 		return got_error_from_errno("imsg_compose "
2347 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2348 
2349 	return flush_imsg(ibuf);
2350 }
2351 
2352 const struct got_error *
2353 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2354 {
2355 	if (imsg_compose(ibuf,
2356 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2357 		return got_error_from_errno("imsg_compose "
2358 		    "GOTCONFIG_SIGNERID_REQUEST");
2359 
2360 	return flush_imsg(ibuf);
2361 }
2362 
2363 const struct got_error *
2364 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2365 {
2366 	if (imsg_compose(ibuf,
2367 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2368 		return got_error_from_errno("imsg_compose "
2369 		    "GOTCONFIG_REMOTE_REQUEST");
2370 
2371 	return flush_imsg(ibuf);
2372 }
2373 
2374 const struct got_error *
2375 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2376 {
2377 	const struct got_error *err = NULL;
2378 	struct imsg imsg;
2379 	size_t datalen;
2380 
2381 	*str = NULL;
2382 
2383 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2384 	if (err)
2385 		return err;
2386 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2387 
2388 	switch (imsg.hdr.type) {
2389 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2390 		if (datalen == 0)
2391 			break;
2392 		/* datalen does not include terminating \0 */
2393 		*str = malloc(datalen + 1);
2394 		if (*str == NULL) {
2395 			err = got_error_from_errno("malloc");
2396 			break;
2397 		}
2398 		memcpy(*str, imsg.data, datalen);
2399 		(*str)[datalen] = '\0';
2400 		break;
2401 	default:
2402 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2403 		break;
2404 	}
2405 
2406 	imsg_free(&imsg);
2407 	return err;
2408 }
2409 
2410 const struct got_error *
2411 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2412     int *nremotes, struct imsgbuf *ibuf)
2413 {
2414 	const struct got_error *err = NULL;
2415 	struct imsg imsg;
2416 	size_t datalen;
2417 	struct got_imsg_remotes iremotes;
2418 	struct got_imsg_remote iremote;
2419 	const size_t min_datalen =
2420 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2421 
2422 	*remotes = NULL;
2423 	*nremotes = 0;
2424 	iremotes.nremotes = 0;
2425 
2426 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2427 	if (err)
2428 		return err;
2429 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2430 
2431 	switch (imsg.hdr.type) {
2432 	case GOT_IMSG_GOTCONFIG_REMOTES:
2433 		if (datalen != sizeof(iremotes)) {
2434 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2435 			break;
2436 		}
2437 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2438 		if (iremotes.nremotes < 0) {
2439 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2440 			break;
2441 		}
2442 		if (iremotes.nremotes == 0) {
2443 			imsg_free(&imsg);
2444 			return NULL;
2445 		}
2446 		break;
2447 	default:
2448 		imsg_free(&imsg);
2449 		return got_error(GOT_ERR_PRIVSEP_MSG);
2450 	}
2451 
2452 	imsg_free(&imsg);
2453 
2454 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2455 	if (*remotes == NULL)
2456 		return got_error_from_errno("recallocarray");
2457 
2458 	while (*nremotes < iremotes.nremotes) {
2459 		struct got_remote_repo *remote;
2460 		const size_t min_datalen =
2461 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2462 		int i;
2463 
2464 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2465 		if (err)
2466 			break;
2467 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2468 
2469 		switch (imsg.hdr.type) {
2470 		case GOT_IMSG_GOTCONFIG_REMOTE:
2471 			remote = &(*remotes)[*nremotes];
2472 			memset(remote, 0, sizeof(*remote));
2473 			if (datalen < sizeof(iremote)) {
2474 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2475 				break;
2476 			}
2477 			memcpy(&iremote, imsg.data, sizeof(iremote));
2478 			if (iremote.name_len == 0 ||
2479 			    (iremote.fetch_url_len == 0 &&
2480 			    iremote.send_url_len == 0) ||
2481 			    (sizeof(iremote) + iremote.name_len +
2482 			    iremote.fetch_url_len + iremote.send_url_len) >
2483 			    datalen) {
2484 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2485 				break;
2486 			}
2487 			remote->name = strndup(imsg.data + sizeof(iremote),
2488 			    iremote.name_len);
2489 			if (remote->name == NULL) {
2490 				err = got_error_from_errno("strndup");
2491 				break;
2492 			}
2493 			remote->fetch_url = strndup(imsg.data +
2494 			    sizeof(iremote) + iremote.name_len,
2495 			    iremote.fetch_url_len);
2496 			if (remote->fetch_url == NULL) {
2497 				err = got_error_from_errno("strndup");
2498 				free_remote_data(remote);
2499 				break;
2500 			}
2501 			remote->send_url = strndup(imsg.data +
2502 			    sizeof(iremote) + iremote.name_len +
2503 			    iremote.fetch_url_len, iremote.send_url_len);
2504 			if (remote->send_url == NULL) {
2505 				err = got_error_from_errno("strndup");
2506 				free_remote_data(remote);
2507 				break;
2508 			}
2509 			remote->mirror_references = iremote.mirror_references;
2510 			remote->fetch_all_branches = iremote.fetch_all_branches;
2511 			if (iremote.nfetch_branches > 0) {
2512 				remote->fetch_branches = recallocarray(NULL, 0,
2513 				    iremote.nfetch_branches, sizeof(char *));
2514 				if (remote->fetch_branches == NULL) {
2515 					err = got_error_from_errno("calloc");
2516 					free_remote_data(remote);
2517 					break;
2518 				}
2519 			}
2520 			remote->nfetch_branches = 0;
2521 			for (i = 0; i < iremote.nfetch_branches; i++) {
2522 				char *branch;
2523 				err = got_privsep_recv_gotconfig_str(&branch,
2524 				    ibuf);
2525 				if (err) {
2526 					free_remote_data(remote);
2527 					goto done;
2528 				}
2529 				remote->fetch_branches[i] = branch;
2530 				remote->nfetch_branches++;
2531 			}
2532 			if (iremote.nsend_branches > 0) {
2533 				remote->send_branches = recallocarray(NULL, 0,
2534 				    iremote.nsend_branches, sizeof(char *));
2535 				if (remote->send_branches == NULL) {
2536 					err = got_error_from_errno("calloc");
2537 					free_remote_data(remote);
2538 					break;
2539 				}
2540 			}
2541 			remote->nsend_branches = 0;
2542 			for (i = 0; i < iremote.nsend_branches; i++) {
2543 				char *branch;
2544 				err = got_privsep_recv_gotconfig_str(&branch,
2545 				    ibuf);
2546 				if (err) {
2547 					free_remote_data(remote);
2548 					goto done;
2549 				}
2550 				remote->send_branches[i] = branch;
2551 				remote->nsend_branches++;
2552 			}
2553 			if (iremote.nfetch_refs > 0) {
2554 				remote->fetch_refs = recallocarray(NULL, 0,
2555 				    iremote.nfetch_refs, sizeof(char *));
2556 				if (remote->fetch_refs == NULL) {
2557 					err = got_error_from_errno("calloc");
2558 					free_remote_data(remote);
2559 					break;
2560 				}
2561 			}
2562 			remote->nfetch_refs = 0;
2563 			for (i = 0; i < iremote.nfetch_refs; i++) {
2564 				char *ref;
2565 				err = got_privsep_recv_gotconfig_str(&ref,
2566 				    ibuf);
2567 				if (err) {
2568 					free_remote_data(remote);
2569 					goto done;
2570 				}
2571 				remote->fetch_refs[i] = ref;
2572 				remote->nfetch_refs++;
2573 			}
2574 			(*nremotes)++;
2575 			break;
2576 		default:
2577 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2578 			break;
2579 		}
2580 
2581 		imsg_free(&imsg);
2582 		if (err)
2583 			break;
2584 	}
2585 done:
2586 	if (err) {
2587 		int i;
2588 		for (i = 0; i < *nremotes; i++)
2589 			free_remote_data(&(*remotes)[i]);
2590 		free(*remotes);
2591 		*remotes = NULL;
2592 		*nremotes = 0;
2593 	}
2594 	return err;
2595 }
2596 
2597 const struct got_error *
2598 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2599     struct got_object_id *id, int idx, const char *path)
2600 {
2601 	struct ibuf *wbuf;
2602 	size_t path_len = strlen(path) + 1;
2603 
2604 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2605 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2606 	if (wbuf == NULL)
2607 		return got_error_from_errno(
2608 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2609 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2610 		return got_error_from_errno("imsg_add "
2611 		    "COMMIT_TRAVERSAL_REQUEST");
2612 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2613 		return got_error_from_errno("imsg_add "
2614 		    "COMMIT_TRAVERSAL_REQUEST");
2615 	if (imsg_add(wbuf, path, path_len) == -1)
2616 		return got_error_from_errno("imsg_add "
2617 		    "COMMIT_TRAVERSAL_REQUEST");
2618 
2619 	wbuf->fd = -1;
2620 	imsg_close(ibuf, wbuf);
2621 
2622 	return flush_imsg(ibuf);
2623 }
2624 
2625 const struct got_error *
2626 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2627     struct got_object_id **changed_commit_id,
2628     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2629 {
2630 	const struct got_error *err = NULL;
2631 	struct imsg imsg;
2632 	struct got_imsg_traversed_commits *icommits;
2633 	size_t datalen;
2634 	int i, done = 0;
2635 
2636 	*changed_commit = NULL;
2637 	*changed_commit_id = NULL;
2638 
2639 	while (!done) {
2640 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2641 		if (err)
2642 			return err;
2643 
2644 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2645 		switch (imsg.hdr.type) {
2646 		case GOT_IMSG_TRAVERSED_COMMITS:
2647 			icommits = imsg.data;
2648 			if (datalen != sizeof(*icommits) +
2649 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2650 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2651 				break;
2652 			}
2653 			for (i = 0; i < icommits->ncommits; i++) {
2654 				struct got_object_qid *qid;
2655 				uint8_t *sha1 = (uint8_t *)imsg.data +
2656 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2657 				err = got_object_qid_alloc_partial(&qid);
2658 				if (err)
2659 					break;
2660 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2661 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2662 
2663 				/* The last commit may contain a change. */
2664 				if (i == icommits->ncommits - 1) {
2665 					*changed_commit_id =
2666 					    got_object_id_dup(&qid->id);
2667 					if (*changed_commit_id == NULL) {
2668 						err = got_error_from_errno(
2669 						    "got_object_id_dup");
2670 						break;
2671 					}
2672 				}
2673 			}
2674 			break;
2675 		case GOT_IMSG_COMMIT:
2676 			if (*changed_commit_id == NULL) {
2677 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2678 				break;
2679 			}
2680 			err = get_commit_from_imsg(changed_commit, &imsg,
2681 			    datalen, ibuf);
2682 			break;
2683 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2684 			done = 1;
2685 			break;
2686 		default:
2687 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2688 			break;
2689 		}
2690 
2691 		imsg_free(&imsg);
2692 		if (err)
2693 			break;
2694 	}
2695 
2696 	if (err)
2697 		got_object_id_queue_free(commit_ids);
2698 	return err;
2699 }
2700 
2701 const struct got_error *
2702 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2703     struct got_object_id *tree_id, const char *path,
2704     struct got_parsed_tree_entry *entries, int nentries)
2705 {
2706 	const struct got_error *err = NULL;
2707 	struct ibuf *wbuf;
2708 	size_t path_len = strlen(path);
2709 	size_t msglen;
2710 
2711 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2712 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2713 	if (wbuf == NULL)
2714 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2715 
2716 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2717 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2718 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2719 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2720 	if (imsg_add(wbuf, path, path_len) == -1)
2721 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2722 
2723 	wbuf->fd = -1;
2724 	imsg_close(ibuf, wbuf);
2725 
2726 	if (entries) {
2727 		err = send_tree_entries(ibuf, entries, nentries);
2728 		if (err)
2729 			return err;
2730 	}
2731 
2732 	return flush_imsg(ibuf);
2733 }
2734 
2735 const struct got_error *
2736 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2737 {
2738 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2739 	    0, 0, -1, NULL, 0) == -1)
2740 		return got_error_from_errno("imsg_compose "
2741 		    "OBJECT_ENUMERATION_REQUEST");
2742 
2743 	return flush_imsg(ibuf);
2744 }
2745 
2746 const struct got_error *
2747 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2748 {
2749 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2750 	    0, 0, -1, NULL, 0) == -1)
2751 		return got_error_from_errno("imsg_compose "
2752 		    "OBJECT_ENUMERATION_DONE");
2753 
2754 	return flush_imsg(ibuf);
2755 }
2756 
2757 const struct got_error *
2758 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2759 {
2760 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2761 	    0, 0, -1, NULL, 0) == -1)
2762 		return got_error_from_errno("imsg_compose "
2763 		    "OBJECT_ENUMERATION_INCOMPLETE");
2764 
2765 	return flush_imsg(ibuf);
2766 }
2767 
2768 const struct got_error *
2769 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2770     struct got_object_id *id, time_t mtime)
2771 {
2772 	struct ibuf *wbuf;
2773 
2774 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2775 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2776 	if (wbuf == NULL)
2777 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2778 
2779 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2780 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2781 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2782 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2783 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2784 
2785 	wbuf->fd = -1;
2786 	imsg_close(ibuf, wbuf);
2787 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2788 	return NULL;
2789 }
2790 
2791 const struct got_error *
2792 got_privsep_recv_enumerated_objects(int *found_all_objects,
2793     struct imsgbuf *ibuf,
2794     got_object_enumerate_commit_cb cb_commit,
2795     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2796     struct got_repository *repo)
2797 {
2798 	const struct got_error *err = NULL;
2799 	struct imsg imsg;
2800 	struct got_imsg_enumerated_commit *icommit = NULL;
2801 	struct got_object_id commit_id;
2802 	int have_commit = 0;
2803 	time_t mtime = 0;
2804 	struct got_tree_object tree;
2805 	struct got_imsg_enumerated_tree *itree;
2806 	struct got_object_id tree_id;
2807 	char *path = NULL, *canon_path = NULL;
2808 	size_t datalen, path_len;
2809 	int nentries = -1;
2810 	int done = 0;
2811 
2812 	*found_all_objects = 0;
2813 	memset(&tree, 0, sizeof(tree));
2814 
2815 	while (!done) {
2816 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2817 		if (err)
2818 			break;
2819 
2820 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2821 		switch (imsg.hdr.type) {
2822 		case GOT_IMSG_ENUMERATED_COMMIT:
2823 			if (have_commit && nentries != -1) {
2824 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2825 				break;
2826 			}
2827 			if (datalen != sizeof(*icommit)) {
2828 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2829 				break;
2830 			}
2831 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2832 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2833 			mtime = icommit->mtime;
2834 			have_commit = 1;
2835 			break;
2836 		case GOT_IMSG_ENUMERATED_TREE:
2837 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2838 			if (!have_commit) {
2839 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2840 				break;
2841 			}
2842 			if (datalen < sizeof(*itree)) {
2843 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2844 				break;
2845 			}
2846 			itree = imsg.data;
2847 			path_len = datalen - sizeof(*itree);
2848 			if (path_len == 0) {
2849 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2850 				break;
2851 			}
2852 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2853 			free(path);
2854 			path = malloc(path_len + 1);
2855 			if (path == NULL) {
2856 				err = got_error_from_errno("malloc");
2857 				break;
2858 			}
2859 			free(canon_path);
2860 			canon_path = malloc(path_len + 1);
2861 			if (canon_path == NULL) {
2862 				err = got_error_from_errno("malloc");
2863 				break;
2864 			}
2865 			memcpy(path, (uint8_t *)imsg.data + sizeof(*itree),
2866 			    path_len);
2867 			path[path_len] = '\0';
2868 			if (!got_path_is_absolute(path)) {
2869 				err = got_error(GOT_ERR_BAD_PATH);
2870 				break;
2871 			}
2872 			if (got_path_is_root_dir(path)) {
2873 				/* XXX check what got_canonpath() does wrong */
2874 				canon_path[0] = '/';
2875 				canon_path[1] = '\0';
2876 			} else {
2877 				err = got_canonpath(path, canon_path,
2878 				    path_len + 1);
2879 				if (err)
2880 					break;
2881 			}
2882 			if (strcmp(path, canon_path) != 0) {
2883 				err = got_error(GOT_ERR_BAD_PATH);
2884 				break;
2885 			}
2886 			if (nentries != -1) {
2887 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2888 				break;
2889 			}
2890 			if (itree->nentries < -1) {
2891 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2892 				break;
2893 			}
2894 			if (itree->nentries == -1) {
2895 				/* Tree was not found in pack file. */
2896 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2897 				    path, repo);
2898 				break;
2899 			}
2900 			if (itree->nentries > INT_MAX) {
2901 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2902 				break;
2903 			}
2904 			tree.entries = calloc(itree->nentries,
2905 			    sizeof(struct got_tree_entry));
2906 			if (tree.entries == NULL) {
2907 				err = got_error_from_errno("calloc");
2908 				break;
2909 			}
2910 			if (itree->nentries == 0) {
2911 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2912 				    path, repo);
2913 				if (err)
2914 					break;
2915 
2916 				/* Prepare for next tree. */
2917 				free(tree.entries);
2918 				memset(&tree, 0, sizeof(tree));
2919 				nentries = -1;
2920 			} else {
2921 				tree.nentries = itree->nentries;
2922 				nentries = 0;
2923 			}
2924 			break;
2925 		case GOT_IMSG_TREE_ENTRIES:
2926 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2927 			if (nentries <= -1) {
2928 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2929 				break;
2930 			}
2931 			err = recv_tree_entries(imsg.data, datalen,
2932 			    &tree, &nentries);
2933 			if (err)
2934 				break;
2935 			if (tree.nentries == nentries) {
2936 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2937 				    path, repo);
2938 				if (err)
2939 					break;
2940 
2941 				/* Prepare for next tree. */
2942 				free(tree.entries);
2943 				memset(&tree, 0, sizeof(tree));
2944 				nentries = -1;
2945 			}
2946 			break;
2947 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2948 			/* All trees have been found and traversed. */
2949 			if (!have_commit || path == NULL || nentries != -1) {
2950 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2951 				break;
2952 			}
2953 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2954 			if (err)
2955 				break;
2956 			have_commit = 0;
2957 			break;
2958 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2959 			*found_all_objects = 1;
2960 			done = 1;
2961 			break;
2962 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
2963 			done = 1;
2964 			break;
2965 		default:
2966 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2967 			break;
2968 		}
2969 
2970 		imsg_free(&imsg);
2971 		if (err)
2972 			break;
2973 	}
2974 
2975 	free(path);
2976 	free(canon_path);
2977 	free(tree.entries);
2978 	return err;
2979 }
2980 
2981 const struct got_error *
2982 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2983     struct got_object_id *id)
2984 {
2985 	struct got_imsg_raw_delta_request dreq;
2986 
2987 	memset(&dreq, 0, sizeof(dreq));
2988 	dreq.idx = idx;
2989 	memcpy(dreq.id, id->sha1, SHA1_DIGEST_LENGTH);
2990 
2991 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
2992 	    &dreq, sizeof(dreq)) == -1)
2993 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
2994 
2995 	return flush_imsg(ibuf);
2996 }
2997 
2998 const struct got_error *
2999 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3000 {
3001 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3002 }
3003 
3004 const struct got_error *
3005 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3006     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3007     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3008 {
3009 	struct got_imsg_raw_delta idelta;
3010 	int ret;
3011 
3012 	memset(&idelta, 0, sizeof(idelta));
3013 	idelta.base_size = base_size;
3014 	idelta.result_size = result_size;
3015 	idelta.delta_size = delta_size;
3016 	idelta.delta_compressed_size = delta_compressed_size;
3017 	idelta.delta_offset = delta_offset;
3018 	idelta.delta_out_offset = delta_out_offset;
3019 	memcpy(idelta.base_id, base_id->sha1, SHA1_DIGEST_LENGTH);
3020 
3021 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3022 	    &idelta, sizeof(idelta));
3023 	if (ret == -1)
3024 		return got_error_from_errno("imsg_compose RAW_DELTA");
3025 
3026 	return flush_imsg(ibuf);
3027 }
3028 
3029 const struct got_error *
3030 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3031     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3032     off_t *delta_out_offset, struct got_object_id **base_id, struct imsgbuf *ibuf)
3033 {
3034 	const struct got_error *err = NULL;
3035 	struct imsg imsg;
3036 	struct got_imsg_raw_delta *delta;
3037 	size_t datalen;
3038 
3039 	*base_size = 0;
3040 	*result_size = 0;
3041 	*delta_size = 0;
3042 	*delta_compressed_size = 0;
3043 	*delta_offset = 0;
3044 	*delta_out_offset = 0;
3045 	*base_id = NULL;
3046 
3047 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3048 	if (err)
3049 		return err;
3050 
3051 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3052 
3053 	switch (imsg.hdr.type) {
3054 	case GOT_IMSG_RAW_DELTA:
3055 		if (datalen != sizeof(*delta)) {
3056 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3057 			break;
3058 		}
3059 		delta = imsg.data;
3060 		*base_size = delta->base_size;
3061 		*result_size = delta->result_size;
3062 		*delta_size = delta->delta_size;
3063 		*delta_compressed_size = delta->delta_compressed_size;
3064 		*delta_offset = delta->delta_offset;
3065 		*delta_out_offset = delta->delta_out_offset;
3066 		*base_id = calloc(1, sizeof(**base_id));
3067 		if (*base_id == NULL) {
3068 			err = got_error_from_errno("malloc");
3069 			break;
3070 		}
3071 		memcpy((*base_id)->sha1, delta->base_id, SHA1_DIGEST_LENGTH);
3072 		break;
3073 	default:
3074 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3075 		break;
3076 	}
3077 
3078 	imsg_free(&imsg);
3079 
3080 	if (err) {
3081 		free(*base_id);
3082 		*base_id = NULL;
3083 	}
3084 	return err;
3085 }
3086 
3087 static const struct got_error *
3088 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3089 {
3090 	const struct got_error *err = NULL;
3091 	struct got_imsg_object_idlist idlist;
3092 	struct ibuf *wbuf;
3093 	size_t i;
3094 
3095 	memset(&idlist, 0, sizeof(idlist));
3096 
3097 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3098 		return got_error(GOT_ERR_NO_SPACE);
3099 
3100 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3101 	    sizeof(idlist) + nids * sizeof(**ids));
3102 	if (wbuf == NULL) {
3103 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3104 		return err;
3105 	}
3106 
3107 	idlist.nids = nids;
3108 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3109 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3110 
3111 	for (i = 0; i < nids; i++) {
3112 		struct got_object_id *id = ids[i];
3113 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3114 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3115 	}
3116 
3117 	wbuf->fd = -1;
3118 	imsg_close(ibuf, wbuf);
3119 
3120 	return flush_imsg(ibuf);
3121 }
3122 
3123 const struct got_error *
3124 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3125     struct got_object_id **ids, size_t nids)
3126 {
3127 	const struct got_error *err = NULL;
3128 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3129 	int i, queued = 0;
3130 
3131 	for (i = 0; i < nids; i++) {
3132 		idlist[i % nitems(idlist)] = ids[i];
3133 		queued++;
3134 		if (queued >= nitems(idlist)) {
3135 			err = send_idlist(ibuf, idlist, queued);
3136 			if (err)
3137 				return err;
3138 			queued = 0;
3139 		}
3140 	}
3141 
3142 	if (queued > 0) {
3143 		err = send_idlist(ibuf, idlist, queued);
3144 		if (err)
3145 			return err;
3146 	}
3147 
3148 	return NULL;
3149 }
3150 
3151 const struct got_error *
3152 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3153 {
3154 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3155 	    == -1)
3156 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3157 
3158 	return flush_imsg(ibuf);
3159 }
3160 
3161 const struct got_error *
3162 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3163     size_t *nids, struct imsgbuf *ibuf)
3164 {
3165 	const struct got_error *err = NULL;
3166 	struct imsg imsg;
3167 	struct got_imsg_object_idlist *idlist;
3168 	size_t datalen;
3169 
3170 	*ids = NULL;
3171 	*done = 0;
3172 	*nids = 0;
3173 
3174 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3175 	if (err)
3176 		return err;
3177 
3178 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3179 	switch (imsg.hdr.type) {
3180 	case GOT_IMSG_OBJ_ID_LIST:
3181 		if (datalen < sizeof(*idlist)) {
3182 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3183 			break;
3184 		}
3185 		idlist = imsg.data;
3186 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3187 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3188 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3189 			break;
3190 		}
3191 		*nids = idlist->nids;
3192 		*ids = calloc(*nids, sizeof(**ids));
3193 		if (*ids == NULL) {
3194 			err = got_error_from_errno("calloc");
3195 			break;
3196 		}
3197 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3198 		    *nids * sizeof(**ids));
3199 		break;
3200 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3201 		*done = 1;
3202 		break;
3203 	default:
3204 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3205 		break;
3206 	}
3207 
3208 	imsg_free(&imsg);
3209 
3210 	return err;
3211 }
3212 
3213 const struct got_error *
3214 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3215 {
3216 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3217 	    == -1)
3218 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3219 
3220 	return flush_imsg(ibuf);
3221 }
3222 
3223 const struct got_error *
3224 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3225     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3226 {
3227 	const struct got_error *err = NULL;
3228 	struct ibuf *wbuf;
3229 	struct got_imsg_reused_deltas ideltas;
3230 	size_t i;
3231 
3232 	memset(&ideltas, 0, sizeof(ideltas));
3233 
3234 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3235 		return got_error(GOT_ERR_NO_SPACE);
3236 
3237 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3238 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3239 	if (wbuf == NULL) {
3240 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3241 		return err;
3242 	}
3243 
3244 	ideltas.ndeltas = ndeltas;
3245 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3246 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3247 
3248 	for (i = 0; i < ndeltas; i++) {
3249 		struct got_imsg_reused_delta *delta = &deltas[i];
3250 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3251 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3252 	}
3253 
3254 	wbuf->fd = -1;
3255 	imsg_close(ibuf, wbuf);
3256 
3257 	return flush_imsg(ibuf);
3258 }
3259 
3260 const struct got_error *
3261 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3262 {
3263 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3264 	    == -1)
3265 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3266 
3267 	return flush_imsg(ibuf);
3268 }
3269 
3270 const struct got_error *
3271 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3272     size_t *ndeltas, struct imsgbuf *ibuf)
3273 {
3274 	const struct got_error *err = NULL;
3275 	struct imsg imsg;
3276 	struct got_imsg_reused_deltas *ideltas;
3277 	size_t datalen;
3278 
3279 	*done = 0;
3280 	*ndeltas = 0;
3281 
3282 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3283 	if (err)
3284 		return err;
3285 
3286 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3287 	switch (imsg.hdr.type) {
3288 	case GOT_IMSG_REUSED_DELTAS:
3289 		if (datalen < sizeof(*ideltas)) {
3290 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3291 			break;
3292 		}
3293 		ideltas = imsg.data;
3294 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3295 		    ideltas->ndeltas * sizeof(*deltas) >
3296 		    datalen - sizeof(*ideltas)) {
3297 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3298 			break;
3299 		}
3300 		*ndeltas = ideltas->ndeltas;
3301 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3302 		    *ndeltas * sizeof(*deltas));
3303 		break;
3304 	case GOT_IMSG_DELTA_REUSE_DONE:
3305 		*done = 1;
3306 		break;
3307 	default:
3308 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3309 		break;
3310 	}
3311 
3312 	imsg_free(&imsg);
3313 
3314 	return err;
3315 }
3316 
3317 const struct got_error *
3318 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3319 {
3320 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3321 	    0, 0, -1, NULL, 0)
3322 	    == -1)
3323 		return got_error_from_errno("imsg_compose "
3324 		    "COMMIT_PAINTING_INIT");
3325 
3326 	return flush_imsg(ibuf);
3327 }
3328 
3329 const struct got_error *
3330 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3331     struct got_object_id *id, intptr_t color)
3332 {
3333 	struct got_imsg_commit_painting_request ireq;
3334 
3335 	memset(&ireq, 0, sizeof(ireq));
3336 	memcpy(ireq.id, id->sha1, sizeof(ireq.id));
3337 	ireq.idx = idx;
3338 	ireq.color = color;
3339 
3340 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3341 	    &ireq, sizeof(ireq)) == -1)
3342 		return got_error_from_errno("imsg_compose "
3343 		    "COMMIT_PAINTING_REQUEST");
3344 
3345 	return flush_imsg(ibuf);
3346 }
3347 
3348 static const struct got_error *
3349 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3350     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3351 {
3352 	const struct got_error *err = NULL;
3353 	struct ibuf *wbuf = NULL;
3354 	struct got_object_qid *qid;
3355 	size_t msglen;
3356 	int ncommits;
3357 	intptr_t color;
3358 
3359 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3360 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3361 	    sizeof(struct got_imsg_painted_commit);
3362 
3363 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3364 	if (wbuf == NULL) {
3365 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3366 		return err;
3367 	}
3368 
3369 	/* Keep in sync with struct got_imsg_painted_commits! */
3370 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3371 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3372 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3373 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3374 
3375 	while (ncommits > 0) {
3376 		qid = STAILQ_FIRST(ids);
3377 		STAILQ_REMOVE_HEAD(ids, entry);
3378 		ncommits--;
3379 		(*nids)--;
3380 		color = (intptr_t)qid->data;
3381 
3382 		/* Keep in sync with struct got_imsg_painted_commit! */
3383 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3384 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3385 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3386 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3387 
3388 		got_object_qid_free(qid);
3389 	}
3390 
3391 	wbuf->fd = -1;
3392 	imsg_close(ibuf, wbuf);
3393 
3394 	return flush_imsg(ibuf);
3395 }
3396 
3397 const struct got_error *
3398 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3399     struct got_object_id_queue *ids, int *nids,
3400     int present_in_pack, int flush)
3401 {
3402 	const struct got_error *err;
3403 	size_t remain;
3404 
3405 	if (*nids <= 0)
3406 		return NULL;
3407 
3408 	do {
3409 		remain = (sizeof(struct got_imsg_painted_commits)) +
3410 		    *nids * sizeof(struct got_imsg_painted_commit);
3411 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3412 			err = send_painted_commits(ids, nids, remain,
3413 			    present_in_pack, ibuf);
3414 			if (err)
3415 				return err;
3416 		}
3417 	} while (flush && *nids > 0);
3418 
3419 	return NULL;
3420 }
3421 
3422 const struct got_error *
3423 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3424 {
3425 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3426 	    0, 0, -1, NULL, 0)
3427 	    == -1)
3428 		return got_error_from_errno("imsg_compose "
3429 		    "COMMIT_PAINTING_DONE");
3430 
3431 	return flush_imsg(ibuf);
3432 }
3433 
3434 const struct got_error *
3435 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3436     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3437 {
3438 	const struct got_error *err = NULL;
3439 	struct imsg imsg;
3440 	struct got_imsg_painted_commits icommits;
3441 	struct got_imsg_painted_commit icommit;
3442 	size_t datalen;
3443 	int i;
3444 
3445 	for (;;) {
3446 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3447 		if (err)
3448 			return err;
3449 
3450 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3451 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3452 			break;
3453 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3454 			return got_error(GOT_ERR_PRIVSEP_MSG);
3455 
3456 		if (datalen < sizeof(icommits))
3457 			return got_error(GOT_ERR_PRIVSEP_LEN);
3458 		memcpy(&icommits, imsg.data, sizeof(icommits));
3459 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3460 		    datalen < sizeof(icommits) +
3461 		    icommits.ncommits * sizeof(icommit))
3462 			return got_error(GOT_ERR_PRIVSEP_LEN);
3463 
3464 		for (i = 0; i < icommits.ncommits; i++) {
3465 			memcpy(&icommit,
3466 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3467 			    sizeof(icommit));
3468 
3469 			if (icommits.present_in_pack) {
3470 				struct got_object_id id;
3471 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3472 				err = cb(cb_arg, &id, icommit.color);
3473 				if (err)
3474 					break;
3475 			} else {
3476 				struct got_object_qid *qid;
3477 				err = got_object_qid_alloc_partial(&qid);
3478 				if (err)
3479 					break;
3480 				memcpy(qid->id.sha1, icommit.id,
3481 				    SHA1_DIGEST_LENGTH);
3482 				qid->data = (void *)icommit.color;
3483 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3484 			}
3485 		}
3486 
3487 		imsg_free(&imsg);
3488 	}
3489 
3490 	return err;
3491 }
3492 
3493 const struct got_error *
3494 got_privsep_unveil_exec_helpers(void)
3495 {
3496 	const char *helpers[] = {
3497 	    GOT_PATH_PROG_READ_PACK,
3498 	    GOT_PATH_PROG_READ_OBJECT,
3499 	    GOT_PATH_PROG_READ_COMMIT,
3500 	    GOT_PATH_PROG_READ_TREE,
3501 	    GOT_PATH_PROG_READ_BLOB,
3502 	    GOT_PATH_PROG_READ_TAG,
3503 	    GOT_PATH_PROG_READ_GITCONFIG,
3504 	    GOT_PATH_PROG_READ_GOTCONFIG,
3505 	    GOT_PATH_PROG_READ_PATCH,
3506 	    GOT_PATH_PROG_FETCH_PACK,
3507 	    GOT_PATH_PROG_INDEX_PACK,
3508 	    GOT_PATH_PROG_SEND_PACK,
3509 	};
3510 	size_t i;
3511 
3512 	for (i = 0; i < nitems(helpers); i++) {
3513 		if (unveil(helpers[i], "x") == 0)
3514 			continue;
3515 		return got_error_from_errno2("unveil", helpers[i]);
3516 	}
3517 
3518 	return NULL;
3519 }
3520 
3521 void
3522 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3523 {
3524 	if (close(imsg_fds[0]) == -1) {
3525 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3526 		_exit(1);
3527 	}
3528 
3529 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3530 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3531 		_exit(1);
3532 	}
3533 
3534 	closefrom(GOT_IMSG_FD_CHILD + 1);
3535 
3536 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3537 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3538 		    strerror(errno));
3539 		_exit(1);
3540 	}
3541 }