1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <unistd.h>
35 #include <zlib.h>
36 #include <time.h>
37 
38 #include "got_object.h"
39 #include "got_error.h"
40 #include "got_path.h"
41 #include "got_repository.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
50 
51 #ifndef MIN
52 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
53 #endif
54 
55 #ifndef nitems
56 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
57 #endif
58 
59 static const struct got_error *
60 poll_fd(int fd, int events, int timeout)
61 {
62 	struct pollfd pfd[1];
63 	struct timespec ts;
64 	sigset_t sigset;
65 	int n;
66 
67 	pfd[0].fd = fd;
68 	pfd[0].events = events;
69 
70 	ts.tv_sec = timeout;
71 	ts.tv_nsec = 0;
72 
73 	if (sigemptyset(&sigset) == -1)
74 		return got_error_from_errno("sigemptyset");
75 	if (sigaddset(&sigset, SIGWINCH) == -1)
76 		return got_error_from_errno("sigaddset");
77 
78 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
79 	if (n == -1)
80 		return got_error_from_errno("ppoll");
81 	if (n == 0)
82 		return got_error(GOT_ERR_TIMEOUT);
83 	if (pfd[0].revents & (POLLERR | POLLNVAL))
84 		return got_error_from_errno("poll error");
85 	if (pfd[0].revents & (events | POLLHUP))
86 		return NULL;
87 
88 	return got_error(GOT_ERR_INTERRUPT);
89 }
90 
91 static const struct got_error *
92 read_imsg(struct imsgbuf *ibuf)
93 {
94 	const struct got_error *err;
95 	size_t n;
96 
97 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
98 	if (err)
99 		return err;
100 
101 	n = imsg_read(ibuf);
102 	if (n == -1) {
103 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
104 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
105 		return got_error(GOT_ERR_PRIVSEP_READ);
106 	}
107 	if (n == 0)
108 		return got_error(GOT_ERR_PRIVSEP_PIPE);
109 
110 	return NULL;
111 }
112 
113 const struct got_error *
114 got_privsep_wait_for_child(pid_t pid)
115 {
116 	int child_status;
117 
118 	if (waitpid(pid, &child_status, 0) == -1)
119 		return got_error_from_errno("waitpid");
120 
121 	if (!WIFEXITED(child_status))
122 		return got_error(GOT_ERR_PRIVSEP_DIED);
123 
124 	if (WEXITSTATUS(child_status) != 0)
125 		return got_error(GOT_ERR_PRIVSEP_EXIT);
126 
127 	return NULL;
128 }
129 
130 static const struct got_error *
131 recv_imsg_error(struct imsg *imsg, size_t datalen)
132 {
133 	struct got_imsg_error *ierr;
134 
135 	if (datalen != sizeof(*ierr))
136 		return got_error(GOT_ERR_PRIVSEP_LEN);
137 
138 	ierr = imsg->data;
139 	if (ierr->code == GOT_ERR_ERRNO) {
140 		static struct got_error serr;
141 		serr.code = GOT_ERR_ERRNO;
142 		serr.msg = strerror(ierr->errno_code);
143 		return &serr;
144 	}
145 
146 	return got_error(ierr->code);
147 }
148 
149 const struct got_error *
150 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
151     size_t min_datalen)
152 {
153 	const struct got_error *err;
154 	ssize_t n;
155 
156 	n = imsg_get(ibuf, imsg);
157 	if (n == -1)
158 		return got_error_from_errno("imsg_get");
159 
160 	while (n == 0) {
161 		err = read_imsg(ibuf);
162 		if (err)
163 			return err;
164 		n = imsg_get(ibuf, imsg);
165 		if (n == -1)
166 			return got_error_from_errno("imsg_get");
167 	}
168 
169 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
170 		return got_error(GOT_ERR_PRIVSEP_LEN);
171 
172 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
173 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
174 		return recv_imsg_error(imsg, datalen);
175 	}
176 
177 	return NULL;
178 }
179 
180 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
181 void
182 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
183 {
184 	const struct got_error *poll_err;
185 	struct got_imsg_error ierr;
186 	int ret;
187 
188 	ierr.code = err->code;
189 	if (err->code == GOT_ERR_ERRNO)
190 		ierr.errno_code = errno;
191 	else
192 		ierr.errno_code = 0;
193 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
194 	if (ret == -1) {
195 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
196 		    getprogname(), err->code, err->msg, strerror(errno));
197 		return;
198 	}
199 
200 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
201 	if (poll_err) {
202 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
203 		    getprogname(), err->code, err->msg, poll_err->msg);
204 		return;
205 	}
206 
207 	ret = imsg_flush(ibuf);
208 	if (ret == -1) {
209 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
210 		    getprogname(), err->code, err->msg, strerror(errno));
211 		imsg_clear(ibuf);
212 		return;
213 	}
214 }
215 
216 static const struct got_error *
217 flush_imsg(struct imsgbuf *ibuf)
218 {
219 	const struct got_error *err;
220 
221 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
222 	if (err)
223 		return err;
224 
225 	if (imsg_flush(ibuf) == -1) {
226 		imsg_clear(ibuf);
227 		return got_error_from_errno("imsg_flush");
228 	}
229 
230 	return NULL;
231 }
232 
233 const struct got_error *
234 got_privsep_flush_imsg(struct imsgbuf *ibuf)
235 {
236 	return flush_imsg(ibuf);
237 }
238 
239 const struct got_error *
240 got_privsep_send_stop(int fd)
241 {
242 	const struct got_error *err = NULL;
243 	struct imsgbuf ibuf;
244 
245 	imsg_init(&ibuf, fd);
246 
247 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
248 		return got_error_from_errno("imsg_compose STOP");
249 
250 	err = flush_imsg(&ibuf);
251 	return err;
252 }
253 
254 const struct got_error *
255 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
256     struct got_object_id *id)
257 {
258 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
259 	    id, sizeof(*id)) == -1)
260 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
261 
262 	return flush_imsg(ibuf);
263 }
264 
265 const struct got_error *
266 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
267     struct got_object_id *id)
268 {
269 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
270 	    id, sizeof(*id)) == -1)
271 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
272 
273 	return flush_imsg(ibuf);
274 }
275 
276 const struct got_error *
277 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
278 {
279 	const struct got_error *err = NULL;
280 
281 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
282 	    == -1) {
283 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
284 		close(outfd);
285 		return err;
286 	}
287 
288 	return flush_imsg(ibuf);
289 }
290 
291 const struct got_error *
292 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
293     uint8_t *data)
294 {
295 	const struct got_error *err = NULL;
296 	struct got_imsg_raw_obj iobj;
297 	size_t len = sizeof(iobj);
298 	struct ibuf *wbuf;
299 
300 	memset(&iobj, 0, sizeof(iobj));
301 	iobj.hdrlen = hdrlen;
302 	iobj.size = size;
303 
304 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
305 		len += (size_t)size + hdrlen;
306 
307 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
308 	if (wbuf == NULL) {
309 		err = got_error_from_errno("imsg_create RAW_OBJECT");
310 		return err;
311 	}
312 
313 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
314 		return got_error_from_errno("imsg_add RAW_OBJECT");
315 
316 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
317 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
318 			return got_error_from_errno("imsg_add RAW_OBJECT");
319 	}
320 
321 	wbuf->fd = -1;
322 	imsg_close(ibuf, wbuf);
323 
324 	return flush_imsg(ibuf);
325 }
326 
327 const struct got_error *
328 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
329     struct imsgbuf *ibuf)
330 {
331 	const struct got_error *err = NULL;
332 	struct imsg imsg;
333 	struct got_imsg_raw_obj *iobj;
334 	size_t datalen;
335 
336 	*outbuf = NULL;
337 
338 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
339 	if (err)
340 		return err;
341 
342 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
343 
344 	switch (imsg.hdr.type) {
345 	case GOT_IMSG_RAW_OBJECT:
346 		if (datalen < sizeof(*iobj)) {
347 			err = got_error(GOT_ERR_PRIVSEP_LEN);
348 			break;
349 		}
350 		iobj = imsg.data;
351 		*size = iobj->size;
352 		*hdrlen = iobj->hdrlen;
353 
354 		if (datalen == sizeof(*iobj)) {
355 			/* Data has been written to file descriptor. */
356 			break;
357 		}
358 
359 		if (*size < 0 ||
360 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
361 			err = got_error(GOT_ERR_PRIVSEP_LEN);
362 			break;
363 		}
364 
365 		*outbuf = malloc(*size + *hdrlen);
366 		if (*outbuf == NULL) {
367 			err = got_error_from_errno("malloc");
368 			break;
369 		}
370 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
371 		break;
372 	default:
373 		err = got_error(GOT_ERR_PRIVSEP_MSG);
374 		break;
375 	}
376 
377 	imsg_free(&imsg);
378 
379 	return err;
380 }
381 
382 const struct got_error *
383 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
384     struct got_object_id *id, int pack_idx)
385 {
386 	const struct got_error *err = NULL;
387 	struct got_imsg_packed_object iobj;
388 	void *data;
389 	size_t len;
390 
391 	memset(&iobj, 0, sizeof(iobj));
392 	if (pack_idx != -1) { /* commit is packed */
393 		iobj.idx = pack_idx;
394 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
395 		data = &iobj;
396 		len = sizeof(iobj);
397 	} else {
398 		data = id;
399 		len = sizeof(*id);
400 	}
401 
402 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
403 	    == -1) {
404 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
405 		close(fd);
406 		return err;
407 	}
408 
409 	return flush_imsg(ibuf);
410 }
411 
412 const struct got_error *
413 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
414     struct got_object_id *id, int pack_idx)
415 {
416 	struct ibuf *wbuf;
417 	size_t len;
418 
419 	if (pack_idx != -1)
420 		len = sizeof(struct got_imsg_packed_object);
421 	else
422 		len = sizeof(*id);
423 
424 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
425 	if (wbuf == NULL)
426 		return got_error_from_errno("imsg_create TREE_REQUEST");
427 
428 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
429 		return got_error_from_errno("imsg_add TREE_REQUEST");
430 
431 	if (pack_idx != -1) { /* tree is packed */
432 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
433 			return got_error_from_errno("imsg_add TREE_REQUEST");
434 	}
435 
436 	wbuf->fd = fd;
437 	imsg_close(ibuf, wbuf);
438 
439 	return flush_imsg(ibuf);
440 }
441 
442 const struct got_error *
443 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
444     struct got_object_id *id, int pack_idx)
445 {
446 	struct got_imsg_packed_object iobj;
447 	void *data;
448 	size_t len;
449 
450 	memset(&iobj, 0, sizeof(iobj));
451 	if (pack_idx != -1) { /* tag is packed */
452 		iobj.idx = pack_idx;
453 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
454 		data = &iobj;
455 		len = sizeof(iobj);
456 	} else {
457 		data = id;
458 		len = sizeof(*id);
459 	}
460 
461 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
462 	    == -1)
463 		return got_error_from_errno("imsg_compose TAG_REQUEST");
464 
465 	return flush_imsg(ibuf);
466 }
467 
468 const struct got_error *
469 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
470     struct got_object_id *id, int pack_idx)
471 {
472 	const struct got_error *err = NULL;
473 	struct got_imsg_packed_object iobj;
474 	void *data;
475 	size_t len;
476 
477 	memset(&iobj, 0, sizeof(iobj));
478 	if (pack_idx != -1) { /* blob is packed */
479 		iobj.idx = pack_idx;
480 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
481 		data = &iobj;
482 		len = sizeof(iobj);
483 	} else {
484 		data = id;
485 		len = sizeof(*id);
486 	}
487 
488 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
489 	    == -1) {
490 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
491 		close(infd);
492 		return err;
493 	}
494 
495 	return flush_imsg(ibuf);
496 }
497 
498 const struct got_error *
499 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
500 {
501 	const struct got_error *err = NULL;
502 
503 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
504 	    == -1) {
505 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
506 		close(outfd);
507 		return err;
508 	}
509 
510 	return flush_imsg(ibuf);
511 }
512 
513 static const struct got_error *
514 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
515 {
516 	const struct got_error *err = NULL;
517 
518 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
519 		err = got_error_from_errno("imsg_compose TMPFD");
520 		close(fd);
521 		return err;
522 	}
523 
524 	return flush_imsg(ibuf);
525 }
526 
527 const struct got_error *
528 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
529 {
530 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
531 }
532 
533 const struct got_error *
534 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
535 {
536 	struct got_imsg_object iobj;
537 
538 	memset(&iobj, 0, sizeof(iobj));
539 
540 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
541 	iobj.type = obj->type;
542 	iobj.flags = obj->flags;
543 	iobj.hdrlen = obj->hdrlen;
544 	iobj.size = obj->size;
545 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
546 		iobj.pack_offset = obj->pack_offset;
547 		iobj.pack_idx = obj->pack_idx;
548 	}
549 
550 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
551 	    == -1)
552 		return got_error_from_errno("imsg_compose OBJECT");
553 
554 	return flush_imsg(ibuf);
555 }
556 
557 const struct got_error *
558 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
559     struct got_pathlist_head *have_refs, int fetch_all_branches,
560     struct got_pathlist_head *wanted_branches,
561     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
562 {
563 	const struct got_error *err = NULL;
564 	struct ibuf *wbuf;
565 	size_t len;
566 	struct got_pathlist_entry *pe;
567 	struct got_imsg_fetch_request fetchreq;
568 
569 	memset(&fetchreq, 0, sizeof(fetchreq));
570 	fetchreq.fetch_all_branches = fetch_all_branches;
571 	fetchreq.list_refs_only = list_refs_only;
572 	fetchreq.verbosity = verbosity;
573 	TAILQ_FOREACH(pe, have_refs, entry)
574 		fetchreq.n_have_refs++;
575 	TAILQ_FOREACH(pe, wanted_branches, entry)
576 		fetchreq.n_wanted_branches++;
577 	TAILQ_FOREACH(pe, wanted_refs, entry)
578 		fetchreq.n_wanted_refs++;
579 	len = sizeof(struct got_imsg_fetch_request);
580 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
581 		close(fd);
582 		return got_error(GOT_ERR_NO_SPACE);
583 	}
584 
585 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
586 	    &fetchreq, sizeof(fetchreq)) == -1)
587 		return got_error_from_errno(
588 		    "imsg_compose FETCH_SERVER_PROGRESS");
589 
590 	err = flush_imsg(ibuf);
591 	if (err) {
592 		close(fd);
593 		return err;
594 	}
595 	fd = -1;
596 
597 	TAILQ_FOREACH(pe, have_refs, entry) {
598 		const char *name = pe->path;
599 		size_t name_len = pe->path_len;
600 		struct got_object_id *id = pe->data;
601 
602 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
603 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
604 		if (wbuf == NULL)
605 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
606 
607 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
608 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
609 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
610 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
611 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
612 		if (imsg_add(wbuf, name, name_len) == -1)
613 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
614 
615 		wbuf->fd = -1;
616 		imsg_close(ibuf, wbuf);
617 		err = flush_imsg(ibuf);
618 		if (err)
619 			return err;
620 	}
621 
622 	TAILQ_FOREACH(pe, wanted_branches, entry) {
623 		const char *name = pe->path;
624 		size_t name_len = pe->path_len;
625 
626 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
627 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
628 		    len);
629 		if (wbuf == NULL)
630 			return got_error_from_errno(
631 			    "imsg_create FETCH_WANTED_BRANCH");
632 
633 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
634 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
635 			return got_error_from_errno(
636 			    "imsg_add FETCH_WANTED_BRANCH");
637 		if (imsg_add(wbuf, name, name_len) == -1)
638 			return got_error_from_errno(
639 			    "imsg_add FETCH_WANTED_BRANCH");
640 
641 		wbuf->fd = -1;
642 		imsg_close(ibuf, wbuf);
643 		err = flush_imsg(ibuf);
644 		if (err)
645 			return err;
646 	}
647 
648 	TAILQ_FOREACH(pe, wanted_refs, entry) {
649 		const char *name = pe->path;
650 		size_t name_len = pe->path_len;
651 
652 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
653 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
654 		    len);
655 		if (wbuf == NULL)
656 			return got_error_from_errno(
657 			    "imsg_create FETCH_WANTED_REF");
658 
659 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
660 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
661 			return got_error_from_errno(
662 			    "imsg_add FETCH_WANTED_REF");
663 		if (imsg_add(wbuf, name, name_len) == -1)
664 			return got_error_from_errno(
665 			    "imsg_add FETCH_WANTED_REF");
666 
667 		wbuf->fd = -1;
668 		imsg_close(ibuf, wbuf);
669 		err = flush_imsg(ibuf);
670 		if (err)
671 			return err;
672 	}
673 
674 
675 	return NULL;
676 
677 }
678 
679 const struct got_error *
680 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
681 {
682 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
683 }
684 
685 const struct got_error *
686 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
687     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
688     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
689 {
690 	const struct got_error *err = NULL;
691 	struct imsg imsg;
692 	size_t datalen;
693 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
694 	size_t n, remain;
695 	off_t off;
696 	int i;
697 
698 	*done = 0;
699 	*id = NULL;
700 	*refname = NULL;
701 	*server_progress = NULL;
702 	*packfile_size = 0;
703 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
704 
705 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
706 	if (err)
707 		return err;
708 
709 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
710 	switch (imsg.hdr.type) {
711 	case GOT_IMSG_ERROR:
712 		err = recv_imsg_error(&imsg, datalen);
713 		break;
714 	case GOT_IMSG_FETCH_SYMREFS:
715 		if (datalen < sizeof(*isymrefs)) {
716 			err = got_error(GOT_ERR_PRIVSEP_LEN);
717 			break;
718 		}
719 		if (isymrefs != NULL) {
720 			err = got_error(GOT_ERR_PRIVSEP_MSG);
721 			break;
722 		}
723 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
724 		off = sizeof(*isymrefs);
725 		remain = datalen - off;
726 		for (n = 0; n < isymrefs->nsymrefs; n++) {
727 			struct got_imsg_fetch_symref *s;
728 			char *name, *target;
729 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
730 				err = got_error(GOT_ERR_PRIVSEP_LEN);
731 				goto done;
732 			}
733 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
734 			off += sizeof(*s);
735 			remain -= sizeof(*s);
736 			if (remain < s->name_len) {
737 				err = got_error(GOT_ERR_PRIVSEP_LEN);
738 				goto done;
739 			}
740 			name = strndup(imsg.data + off, s->name_len);
741 			if (name == NULL) {
742 				err = got_error_from_errno("strndup");
743 				goto done;
744 			}
745 			off += s->name_len;
746 			remain -= s->name_len;
747 			if (remain < s->target_len) {
748 				err = got_error(GOT_ERR_PRIVSEP_LEN);
749 				free(name);
750 				goto done;
751 			}
752 			target = strndup(imsg.data + off, s->target_len);
753 			if (target == NULL) {
754 				err = got_error_from_errno("strndup");
755 				free(name);
756 				goto done;
757 			}
758 			off += s->target_len;
759 			remain -= s->target_len;
760 			err = got_pathlist_append(symrefs, name, target);
761 			if (err) {
762 				free(name);
763 				free(target);
764 				goto done;
765 			}
766 		}
767 		break;
768 	case GOT_IMSG_FETCH_REF:
769 		if (datalen <= SHA1_DIGEST_LENGTH) {
770 			err = got_error(GOT_ERR_PRIVSEP_MSG);
771 			break;
772 		}
773 		*id = malloc(sizeof(**id));
774 		if (*id == NULL) {
775 			err = got_error_from_errno("malloc");
776 			break;
777 		}
778 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
779 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
780 		    datalen - SHA1_DIGEST_LENGTH);
781 		if (*refname == NULL) {
782 			err = got_error_from_errno("strndup");
783 			break;
784 		}
785 		break;
786 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
787 		if (datalen == 0) {
788 			err = got_error(GOT_ERR_PRIVSEP_LEN);
789 			break;
790 		}
791 		*server_progress = strndup(imsg.data, datalen);
792 		if (*server_progress == NULL) {
793 			err = got_error_from_errno("strndup");
794 			break;
795 		}
796 		for (i = 0; i < datalen; i++) {
797 			if (!isprint((unsigned char)(*server_progress)[i]) &&
798 			    !isspace((unsigned char)(*server_progress)[i])) {
799 				err = got_error(GOT_ERR_PRIVSEP_MSG);
800 				free(*server_progress);
801 				*server_progress = NULL;
802 				goto done;
803 			}
804 		}
805 		break;
806 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
807 		if (datalen < sizeof(*packfile_size)) {
808 			err = got_error(GOT_ERR_PRIVSEP_MSG);
809 			break;
810 		}
811 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
812 		break;
813 	case GOT_IMSG_FETCH_DONE:
814 		if (datalen != SHA1_DIGEST_LENGTH) {
815 			err = got_error(GOT_ERR_PRIVSEP_MSG);
816 			break;
817 		}
818 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
819 		*done = 1;
820 		break;
821 	default:
822 		err = got_error(GOT_ERR_PRIVSEP_MSG);
823 		break;
824 	}
825 done:
826 	if (err) {
827 		free(*id);
828 		*id = NULL;
829 		free(*refname);
830 		*refname = NULL;
831 	}
832 	imsg_free(&imsg);
833 	return err;
834 }
835 
836 static const struct got_error *
837 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
838     int delete, struct imsgbuf *ibuf)
839 {
840 	size_t len;
841 	struct ibuf *wbuf;
842 
843 	len = sizeof(struct got_imsg_send_ref) + name_len;
844 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
845 	if (wbuf == NULL)
846 		return got_error_from_errno("imsg_create SEND_REF");
847 
848 	/* Keep in sync with struct got_imsg_send_ref! */
849 	if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
850 		return got_error_from_errno("imsg_add SEND_REF");
851 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
852 		return got_error_from_errno("imsg_add SEND_REF");
853 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
854 		return got_error_from_errno("imsg_add SEND_REF");
855 	if (imsg_add(wbuf, name, name_len) == -1)
856 		return got_error_from_errno("imsg_add SEND_REF");
857 
858 	wbuf->fd = -1;
859 	imsg_close(ibuf, wbuf);
860 	return flush_imsg(ibuf);
861 }
862 
863 const struct got_error *
864 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
865     struct got_pathlist_head *have_refs,
866     struct got_pathlist_head *delete_refs,
867     int verbosity)
868 {
869 	const struct got_error *err = NULL;
870 	struct got_pathlist_entry *pe;
871 	struct got_imsg_send_request sendreq;
872 	struct got_object_id zero_id;
873 
874 	memset(&zero_id, 0, sizeof(zero_id));
875 	memset(&sendreq, 0, sizeof(sendreq));
876 	sendreq.verbosity = verbosity;
877 	TAILQ_FOREACH(pe, have_refs, entry)
878 		sendreq.nrefs++;
879 	TAILQ_FOREACH(pe, delete_refs, entry)
880 		sendreq.nrefs++;
881 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
882 	    &sendreq, sizeof(sendreq)) == -1) {
883 		err = got_error_from_errno(
884 		    "imsg_compose FETCH_SERVER_PROGRESS");
885 		goto done;
886 	}
887 
888 	err = flush_imsg(ibuf);
889 	if (err)
890 		goto done;
891 	fd = -1;
892 
893 	TAILQ_FOREACH(pe, have_refs, entry) {
894 		const char *name = pe->path;
895 		size_t name_len = pe->path_len;
896 		struct got_object_id *id = pe->data;
897 		err = send_send_ref(name, name_len, id, 0, ibuf);
898 		if (err)
899 			goto done;
900 	}
901 
902 	TAILQ_FOREACH(pe, delete_refs, entry) {
903 		const char *name = pe->path;
904 		size_t name_len = pe->path_len;
905 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
906 		if (err)
907 			goto done;
908 	}
909 done:
910 	if (fd != -1 && close(fd) == -1 && err == NULL)
911 		err = got_error_from_errno("close");
912 	return err;
913 
914 }
915 
916 const struct got_error *
917 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
918     struct imsgbuf *ibuf)
919 {
920 	const struct got_error *err = NULL;
921 	struct imsg imsg;
922 	size_t datalen;
923 	int done = 0;
924 	struct got_imsg_send_remote_ref iremote_ref;
925 	struct got_object_id *id = NULL;
926 	char *refname = NULL;
927 	struct got_pathlist_entry *new;
928 
929 	while (!done) {
930 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
931 		if (err)
932 			return err;
933 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
934 		switch (imsg.hdr.type) {
935 		case GOT_IMSG_ERROR:
936 			err = recv_imsg_error(&imsg, datalen);
937 			goto done;
938 		case GOT_IMSG_SEND_REMOTE_REF:
939 			if (datalen < sizeof(iremote_ref)) {
940 				err = got_error(GOT_ERR_PRIVSEP_MSG);
941 				goto done;
942 			}
943 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
944 			if (datalen != sizeof(iremote_ref) +
945 			    iremote_ref.name_len) {
946 				err = got_error(GOT_ERR_PRIVSEP_MSG);
947 				goto done;
948 			}
949 			id = malloc(sizeof(*id));
950 			if (id == NULL) {
951 				err = got_error_from_errno("malloc");
952 				goto done;
953 			}
954 			memcpy(id->sha1, iremote_ref.id, SHA1_DIGEST_LENGTH);
955 			refname = strndup(imsg.data + sizeof(iremote_ref),
956 			    datalen - sizeof(iremote_ref));
957 			if (refname == NULL) {
958 				err = got_error_from_errno("strndup");
959 				goto done;
960 			}
961 			err = got_pathlist_insert(&new, remote_refs,
962 			    refname, id);
963 			if (err)
964 				goto done;
965 			if (new == NULL) { /* duplicate which wasn't inserted */
966 				free(id);
967 				free(refname);
968 			}
969 			id = NULL;
970 			refname = NULL;
971 			break;
972 		case GOT_IMSG_SEND_PACK_REQUEST:
973 			if (datalen != 0) {
974 				err = got_error(GOT_ERR_PRIVSEP_MSG);
975 				goto done;
976 			}
977 			/* got-send-pack is now waiting for a pack file. */
978 			done = 1;
979 			break;
980 		default:
981 			err = got_error(GOT_ERR_PRIVSEP_MSG);
982 			break;
983 		}
984 	}
985 done:
986 	free(id);
987 	free(refname);
988 	imsg_free(&imsg);
989 	return err;
990 }
991 
992 const struct got_error *
993 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
994 {
995 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
996 }
997 
998 const struct got_error *
999 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
1000     int *success, char **refname, struct imsgbuf *ibuf)
1001 {
1002 	const struct got_error *err = NULL;
1003 	struct imsg imsg;
1004 	size_t datalen;
1005 	struct got_imsg_send_ref_status iref_status;
1006 
1007 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1008 	*done = 0;
1009 	*success = 0;
1010 	*refname = NULL;
1011 
1012 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1013 	if (err)
1014 		return err;
1015 
1016 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1017 	switch (imsg.hdr.type) {
1018 	case GOT_IMSG_ERROR:
1019 		err = recv_imsg_error(&imsg, datalen);
1020 		break;
1021 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1022 		if (datalen < sizeof(*bytes_sent)) {
1023 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1024 			break;
1025 		}
1026 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1027 		break;
1028 	case GOT_IMSG_SEND_REF_STATUS:
1029 		if (datalen < sizeof(iref_status)) {
1030 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1031 			break;
1032 		}
1033 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1034 		if (datalen != sizeof(iref_status) + iref_status.name_len) {
1035 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1036 			break;
1037 		}
1038 		*success = iref_status.success;
1039 		*refname = strndup(imsg.data + sizeof(iref_status),
1040 		    iref_status.name_len);
1041 		break;
1042 	case GOT_IMSG_SEND_DONE:
1043 		if (datalen != 0) {
1044 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1045 			break;
1046 		}
1047 		*done = 1;
1048 		break;
1049 	default:
1050 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1051 		break;
1052 	}
1053 
1054 	imsg_free(&imsg);
1055 	return err;
1056 }
1057 
1058 const struct got_error *
1059 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1060     int fd)
1061 {
1062 	const struct got_error *err = NULL;
1063 
1064 	/* Keep in sync with struct got_imsg_index_pack_request */
1065 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1066 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1067 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1068 		close(fd);
1069 		return err;
1070 	}
1071 	return flush_imsg(ibuf);
1072 }
1073 
1074 const struct got_error *
1075 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1076 {
1077 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1078 }
1079 
1080 const struct got_error *
1081 got_privsep_recv_index_progress(int *done, int *nobj_total,
1082     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1083     struct imsgbuf *ibuf)
1084 {
1085 	const struct got_error *err = NULL;
1086 	struct imsg imsg;
1087 	struct got_imsg_index_pack_progress *iprogress;
1088 	size_t datalen;
1089 
1090 	*done = 0;
1091 	*nobj_total = 0;
1092 	*nobj_indexed = 0;
1093 	*nobj_resolved = 0;
1094 
1095 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1096 	if (err)
1097 		return err;
1098 
1099 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1100 	switch (imsg.hdr.type) {
1101 	case GOT_IMSG_ERROR:
1102 		err = recv_imsg_error(&imsg, datalen);
1103 		break;
1104 	case GOT_IMSG_IDXPACK_PROGRESS:
1105 		if (datalen < sizeof(*iprogress)) {
1106 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1107 			break;
1108 		}
1109 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1110 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1111 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1112 			err = got_error(GOT_ERR_RANGE);
1113 			break;
1114 		}
1115 		*nobj_total = iprogress->nobj_total;
1116 		*nobj_indexed = iprogress->nobj_indexed;
1117 		*nobj_loose = iprogress->nobj_loose;
1118 		*nobj_resolved = iprogress->nobj_resolved;
1119 		break;
1120 	case GOT_IMSG_IDXPACK_DONE:
1121 		if (datalen != 0) {
1122 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1123 			break;
1124 		}
1125 		*done = 1;
1126 		break;
1127 	default:
1128 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1129 		break;
1130 	}
1131 
1132 	imsg_free(&imsg);
1133 	return err;
1134 }
1135 
1136 const struct got_error *
1137 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1138     struct imsgbuf *ibuf)
1139 {
1140 	struct got_imsg_object *iobj;
1141 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1142 
1143 	if (datalen != sizeof(*iobj))
1144 		return got_error(GOT_ERR_PRIVSEP_LEN);
1145 	iobj = imsg->data;
1146 
1147 	if (iobj->pack_offset < 0)
1148 		return got_error(GOT_ERR_PACK_OFFSET);
1149 
1150 	*obj = calloc(1, sizeof(**obj));
1151 	if (*obj == NULL)
1152 		return got_error_from_errno("calloc");
1153 
1154 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1155 	(*obj)->type = iobj->type;
1156 	(*obj)->flags = iobj->flags;
1157 	(*obj)->hdrlen = iobj->hdrlen;
1158 	(*obj)->size = iobj->size;
1159 	/* path_packfile is handled by caller */
1160 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1161 		(*obj)->pack_offset = iobj->pack_offset;
1162 		(*obj)->pack_idx = iobj->pack_idx;
1163 	}
1164 	STAILQ_INIT(&(*obj)->deltas.entries);
1165 	return NULL;
1166 }
1167 
1168 const struct got_error *
1169 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1170 {
1171 	const struct got_error *err = NULL;
1172 	struct imsg imsg;
1173 	const size_t min_datalen =
1174 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1175 
1176 	*obj = NULL;
1177 
1178 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1179 	if (err)
1180 		return err;
1181 
1182 	switch (imsg.hdr.type) {
1183 	case GOT_IMSG_OBJECT:
1184 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1185 		break;
1186 	default:
1187 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1188 		break;
1189 	}
1190 
1191 	imsg_free(&imsg);
1192 
1193 	return err;
1194 }
1195 
1196 static const struct got_error *
1197 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1198     size_t logmsg_len)
1199 {
1200 	const struct got_error *err = NULL;
1201 	size_t offset, remain;
1202 
1203 	offset = 0;
1204 	remain = logmsg_len;
1205 	while (remain > 0) {
1206 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1207 
1208 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1209 		    commit->logmsg + offset, n) == -1) {
1210 			err = got_error_from_errno("imsg_compose "
1211 			    "COMMIT_LOGMSG");
1212 			break;
1213 		}
1214 
1215 		err = flush_imsg(ibuf);
1216 		if (err)
1217 			break;
1218 
1219 		offset += n;
1220 		remain -= n;
1221 	}
1222 
1223 	return err;
1224 }
1225 
1226 const struct got_error *
1227 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1228 {
1229 	const struct got_error *err = NULL;
1230 	struct got_imsg_commit_object *icommit;
1231 	uint8_t *buf;
1232 	size_t len, total;
1233 	struct got_object_qid *qid;
1234 	size_t author_len = strlen(commit->author);
1235 	size_t committer_len = strlen(commit->committer);
1236 	size_t logmsg_len = strlen(commit->logmsg);
1237 
1238 	total = sizeof(*icommit) + author_len + committer_len +
1239 	    commit->nparents * SHA1_DIGEST_LENGTH;
1240 
1241 	buf = malloc(total);
1242 	if (buf == NULL)
1243 		return got_error_from_errno("malloc");
1244 
1245 	icommit = (struct got_imsg_commit_object *)buf;
1246 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1247 	    sizeof(icommit->tree_id));
1248 	icommit->author_len = author_len;
1249 	icommit->author_time = commit->author_time;
1250 	icommit->author_gmtoff = commit->author_gmtoff;
1251 	icommit->committer_len = committer_len;
1252 	icommit->committer_time = commit->committer_time;
1253 	icommit->committer_gmtoff = commit->committer_gmtoff;
1254 	icommit->logmsg_len = logmsg_len;
1255 	icommit->nparents = commit->nparents;
1256 
1257 	len = sizeof(*icommit);
1258 	memcpy(buf + len, commit->author, author_len);
1259 	len += author_len;
1260 	memcpy(buf + len, commit->committer, committer_len);
1261 	len += committer_len;
1262 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1263 		memcpy(buf + len, &qid->id, SHA1_DIGEST_LENGTH);
1264 		len += SHA1_DIGEST_LENGTH;
1265 	}
1266 
1267 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1268 		err = got_error_from_errno("imsg_compose COMMIT");
1269 		goto done;
1270 	}
1271 
1272 	if (logmsg_len == 0 ||
1273 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1274 		err = flush_imsg(ibuf);
1275 		if (err)
1276 			goto done;
1277 	}
1278 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1279 done:
1280 	free(buf);
1281 	return err;
1282 }
1283 
1284 static const struct got_error *
1285 get_commit_from_imsg(struct got_commit_object **commit,
1286     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1287 {
1288 	const struct got_error *err = NULL;
1289 	struct got_imsg_commit_object *icommit;
1290 	size_t len = 0;
1291 	int i;
1292 
1293 	if (datalen < sizeof(*icommit))
1294 		return got_error(GOT_ERR_PRIVSEP_LEN);
1295 
1296 	icommit = imsg->data;
1297 	if (datalen != sizeof(*icommit) + icommit->author_len +
1298 	    icommit->committer_len +
1299 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1300 		return got_error(GOT_ERR_PRIVSEP_LEN);
1301 
1302 	if (icommit->nparents < 0)
1303 		return got_error(GOT_ERR_PRIVSEP_LEN);
1304 
1305 	len += sizeof(*icommit);
1306 
1307 	*commit = got_object_commit_alloc_partial();
1308 	if (*commit == NULL)
1309 		return got_error_from_errno(
1310 		    "got_object_commit_alloc_partial");
1311 
1312 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1313 	    SHA1_DIGEST_LENGTH);
1314 	(*commit)->author_time = icommit->author_time;
1315 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1316 	(*commit)->committer_time = icommit->committer_time;
1317 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1318 
1319 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1320 	if ((*commit)->author == NULL) {
1321 		err = got_error_from_errno("strndup");
1322 		goto done;
1323 	}
1324 	len += icommit->author_len;
1325 
1326 	(*commit)->committer = strndup(imsg->data + len,
1327 	    icommit->committer_len);
1328 	if ((*commit)->committer == NULL) {
1329 		err = got_error_from_errno("strndup");
1330 		goto done;
1331 	}
1332 	len += icommit->committer_len;
1333 
1334 	if (icommit->logmsg_len == 0) {
1335 		(*commit)->logmsg = strdup("");
1336 		if ((*commit)->logmsg == NULL) {
1337 			err = got_error_from_errno("strdup");
1338 			goto done;
1339 		}
1340 	} else {
1341 		size_t offset = 0, remain = icommit->logmsg_len;
1342 
1343 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1344 		if ((*commit)->logmsg == NULL) {
1345 			err = got_error_from_errno("malloc");
1346 			goto done;
1347 		}
1348 		while (remain > 0) {
1349 			struct imsg imsg_log;
1350 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1351 			    remain);
1352 
1353 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1354 			if (err)
1355 				goto done;
1356 
1357 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1358 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1359 				goto done;
1360 			}
1361 
1362 			memcpy((*commit)->logmsg + offset,
1363 			    imsg_log.data, n);
1364 			imsg_free(&imsg_log);
1365 			offset += n;
1366 			remain -= n;
1367 		}
1368 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1369 	}
1370 
1371 	for (i = 0; i < icommit->nparents; i++) {
1372 		struct got_object_qid *qid;
1373 
1374 		err = got_object_qid_alloc_partial(&qid);
1375 		if (err)
1376 			break;
1377 		memcpy(&qid->id, imsg->data + len +
1378 		    i * SHA1_DIGEST_LENGTH, sizeof(qid->id));
1379 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1380 		(*commit)->nparents++;
1381 	}
1382 done:
1383 	if (err) {
1384 		got_object_commit_close(*commit);
1385 		*commit = NULL;
1386 	}
1387 	return err;
1388 }
1389 
1390 const struct got_error *
1391 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1392 {
1393 	const struct got_error *err = NULL;
1394 	struct imsg imsg;
1395 	size_t datalen;
1396 	const size_t min_datalen =
1397 	    MIN(sizeof(struct got_imsg_error),
1398 	    sizeof(struct got_imsg_commit_object));
1399 
1400 	*commit = NULL;
1401 
1402 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1403 	if (err)
1404 		return err;
1405 
1406 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1407 
1408 	switch (imsg.hdr.type) {
1409 	case GOT_IMSG_COMMIT:
1410 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1411 		break;
1412 	default:
1413 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1414 		break;
1415 	}
1416 
1417 	imsg_free(&imsg);
1418 
1419 	return err;
1420 }
1421 
1422 static const struct got_error *
1423 send_tree_entries_batch(struct imsgbuf *ibuf,
1424     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1425 {
1426 	struct ibuf *wbuf;
1427 	struct got_imsg_tree_entries ientries;
1428 	int i;
1429 
1430 	memset(&ientries, 0, sizeof(ientries));
1431 
1432 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1433 	if (wbuf == NULL)
1434 		return got_error_from_errno("imsg_create TREE_ENTRY");
1435 
1436 	ientries.nentries = idxN - idx0 + 1;
1437 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1438 		return got_error_from_errno("imsg_add TREE_ENTRY");
1439 
1440 	for (i = idx0; i <= idxN; i++) {
1441 		struct got_parsed_tree_entry *pte = &entries[i];
1442 
1443 		/* Keep in sync with struct got_imsg_tree_object definition! */
1444 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1445 			return got_error_from_errno("imsg_add TREE_ENTRY");
1446 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1447 			return got_error_from_errno("imsg_add TREE_ENTRY");
1448 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1449 			return got_error_from_errno("imsg_add TREE_ENTRY");
1450 
1451 		/* Remaining bytes are the entry's name. */
1452 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1453 			return got_error_from_errno("imsg_add TREE_ENTRY");
1454 	}
1455 
1456 	wbuf->fd = -1;
1457 	imsg_close(ibuf, wbuf);
1458 	return NULL;
1459 }
1460 
1461 static const struct got_error *
1462 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1463     int nentries)
1464 {
1465 	const struct got_error *err = NULL;
1466 	int i, j;
1467 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1468 
1469 	i = 0;
1470 	for (j = 0; j < nentries; j++) {
1471 		struct got_parsed_tree_entry *pte = &entries[j];
1472 		size_t len = sizeof(*pte) + pte->namelen;
1473 
1474 		if (j > 0 &&
1475 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1476 			err = send_tree_entries_batch(ibuf, entries,
1477 			    i, j - 1, entries_len);
1478 			if (err)
1479 				return err;
1480 			i = j;
1481 			entries_len = sizeof(struct got_imsg_tree_entries);
1482 		}
1483 
1484 		entries_len += len;
1485 	}
1486 
1487 	if (j > 0) {
1488 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1489 		    entries_len);
1490 		if (err)
1491 			return err;
1492 	}
1493 
1494 	return NULL;
1495 }
1496 
1497 const struct got_error *
1498 got_privsep_send_tree(struct imsgbuf *ibuf,
1499     struct got_parsed_tree_entry *entries, int nentries)
1500 {
1501 	const struct got_error *err = NULL;
1502 	struct got_imsg_tree_object itree;
1503 
1504 	memset(&itree, 0, sizeof(itree));
1505 	itree.nentries = nentries;
1506 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1507 	    == -1)
1508 		return got_error_from_errno("imsg_compose TREE");
1509 
1510 	err = send_tree_entries(ibuf, entries, nentries);
1511 	if (err)
1512 		return err;
1513 
1514 	return flush_imsg(ibuf);
1515 }
1516 
1517 
1518 static const struct got_error *
1519 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1520     int *nentries)
1521 {
1522 	const struct got_error *err = NULL;
1523 	struct got_imsg_tree_entries *ientries;
1524 	struct got_tree_entry *te;
1525 	size_t te_offset;
1526 	size_t i;
1527 
1528 	if (datalen <= sizeof(*ientries) ||
1529 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1530 		return got_error(GOT_ERR_PRIVSEP_LEN);
1531 
1532 	ientries = (struct got_imsg_tree_entries *)data;
1533 	if (ientries->nentries > INT_MAX) {
1534 		return got_error_msg(GOT_ERR_NO_SPACE,
1535 		    "too many tree entries");
1536 	}
1537 
1538 	te_offset = sizeof(*ientries);
1539 	for (i = 0; i < ientries->nentries; i++) {
1540 		struct got_imsg_tree_entry ite;
1541 		const char *te_name;
1542 		uint8_t *buf = (uint8_t *)data + te_offset;
1543 
1544 		if (te_offset >= datalen) {
1545 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1546 			break;
1547 		}
1548 
1549 		/* Might not be aligned, size is ~32 bytes. */
1550 		memcpy(&ite, buf, sizeof(ite));
1551 
1552 		if (ite.namelen >= sizeof(te->name)) {
1553 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1554 			break;
1555 		}
1556 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1557 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1558 			break;
1559 		}
1560 
1561 		if (*nentries >= tree->nentries) {
1562 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1563 			break;
1564 		}
1565 		te = &tree->entries[*nentries];
1566 		te_name = buf + sizeof(ite);
1567 		memcpy(te->name, te_name, ite.namelen);
1568 		te->name[ite.namelen] = '\0';
1569 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1570 		te->mode = ite.mode;
1571 		te->idx = *nentries;
1572 		(*nentries)++;
1573 
1574 		te_offset += sizeof(ite) + ite.namelen;
1575 	}
1576 
1577 	return err;
1578 }
1579 
1580 const struct got_error *
1581 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1582 {
1583 	const struct got_error *err = NULL;
1584 	const size_t min_datalen =
1585 	    MIN(sizeof(struct got_imsg_error),
1586 	    sizeof(struct got_imsg_tree_object));
1587 	struct got_imsg_tree_object *itree;
1588 	int nentries = 0;
1589 
1590 	*tree = NULL;
1591 
1592 	err = read_imsg(ibuf);
1593 	if (err)
1594 		goto done;
1595 
1596 	for (;;) {
1597 		struct imsg imsg;
1598 		size_t n;
1599 		size_t datalen;
1600 
1601 		n = imsg_get(ibuf, &imsg);
1602 		if (n == 0) {
1603 			if ((*tree)) {
1604 				if (nentries < (*tree)->nentries) {
1605 					err = read_imsg(ibuf);
1606 					if (err)
1607 						break;
1608 					continue;
1609 				} else
1610 					break;
1611 			} else {
1612 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1613 				break;
1614 			}
1615 		}
1616 
1617 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1618 			imsg_free(&imsg);
1619 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1620 			break;
1621 		}
1622 
1623 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1624 
1625 		switch (imsg.hdr.type) {
1626 		case GOT_IMSG_ERROR:
1627 			err = recv_imsg_error(&imsg, datalen);
1628 			break;
1629 		case GOT_IMSG_TREE:
1630 			/* This message should only appear once. */
1631 			if (*tree != NULL) {
1632 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1633 				break;
1634 			}
1635 			if (datalen != sizeof(*itree)) {
1636 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1637 				break;
1638 			}
1639 			itree = imsg.data;
1640 			if (itree->nentries < 0) {
1641 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1642 				break;
1643 			}
1644 			*tree = malloc(sizeof(**tree));
1645 			if (*tree == NULL) {
1646 				err = got_error_from_errno("malloc");
1647 				break;
1648 			}
1649 			(*tree)->entries = calloc(itree->nentries,
1650 			    sizeof(struct got_tree_entry));
1651 			if ((*tree)->entries == NULL) {
1652 				err = got_error_from_errno("malloc");
1653 				free(*tree);
1654 				*tree = NULL;
1655 				break;
1656 			}
1657 			(*tree)->nentries = itree->nentries;
1658 			(*tree)->refcnt = 0;
1659 			break;
1660 		case GOT_IMSG_TREE_ENTRIES:
1661 			/* This message should be preceeded by GOT_IMSG_TREE. */
1662 			if (*tree == NULL) {
1663 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1664 				break;
1665 			}
1666 			err = recv_tree_entries(imsg.data, datalen,
1667 			    *tree, &nentries);
1668 			break;
1669 		default:
1670 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1671 			break;
1672 		}
1673 
1674 		imsg_free(&imsg);
1675 		if (err)
1676 			break;
1677 	}
1678 done:
1679 	if (*tree && (*tree)->nentries != nentries) {
1680 		if (err == NULL)
1681 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1682 		got_object_tree_close(*tree);
1683 		*tree = NULL;
1684 	}
1685 
1686 	return err;
1687 }
1688 
1689 const struct got_error *
1690 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1691     const uint8_t *data)
1692 {
1693 	struct got_imsg_blob iblob;
1694 
1695 	memset(&iblob, 0, sizeof(iblob));
1696 	iblob.size = size;
1697 	iblob.hdrlen = hdrlen;
1698 
1699 	if (data) {
1700 		uint8_t *buf;
1701 
1702 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1703 			return got_error(GOT_ERR_NO_SPACE);
1704 
1705 		buf = malloc(sizeof(iblob) + size);
1706 		if (buf == NULL)
1707 			return got_error_from_errno("malloc");
1708 
1709 		memcpy(buf, &iblob, sizeof(iblob));
1710 		memcpy(buf + sizeof(iblob), data, size);
1711 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1712 		    sizeof(iblob) + size) == -1) {
1713 			free(buf);
1714 			return got_error_from_errno("imsg_compose BLOB");
1715 		}
1716 		free(buf);
1717 	} else {
1718 		/* Data has already been written to file descriptor. */
1719 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1720 		    sizeof(iblob)) == -1)
1721 			return got_error_from_errno("imsg_compose BLOB");
1722 	}
1723 
1724 
1725 	return flush_imsg(ibuf);
1726 }
1727 
1728 const struct got_error *
1729 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1730     struct imsgbuf *ibuf)
1731 {
1732 	const struct got_error *err = NULL;
1733 	struct imsg imsg;
1734 	struct got_imsg_blob *iblob;
1735 	size_t datalen;
1736 
1737 	*outbuf = NULL;
1738 
1739 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1740 	if (err)
1741 		return err;
1742 
1743 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1744 
1745 	switch (imsg.hdr.type) {
1746 	case GOT_IMSG_BLOB:
1747 		if (datalen < sizeof(*iblob)) {
1748 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1749 			break;
1750 		}
1751 		iblob = imsg.data;
1752 		*size = iblob->size;
1753 		*hdrlen = iblob->hdrlen;
1754 
1755 		if (datalen == sizeof(*iblob)) {
1756 			/* Data has been written to file descriptor. */
1757 			break;
1758 		}
1759 
1760 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1761 		    *size > datalen + sizeof(*iblob)) {
1762 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1763 			break;
1764 		}
1765 
1766 		*outbuf = malloc(*size);
1767 		if (*outbuf == NULL) {
1768 			err = got_error_from_errno("malloc");
1769 			break;
1770 		}
1771 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1772 		break;
1773 	default:
1774 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1775 		break;
1776 	}
1777 
1778 	imsg_free(&imsg);
1779 
1780 	return err;
1781 }
1782 
1783 static const struct got_error *
1784 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1785 {
1786 	const struct got_error *err = NULL;
1787 	size_t offset, remain;
1788 
1789 	offset = 0;
1790 	remain = tagmsg_len;
1791 	while (remain > 0) {
1792 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1793 
1794 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1795 		    tag->tagmsg + offset, n) == -1) {
1796 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1797 			break;
1798 		}
1799 
1800 		err = flush_imsg(ibuf);
1801 		if (err)
1802 			break;
1803 
1804 		offset += n;
1805 		remain -= n;
1806 	}
1807 
1808 	return err;
1809 }
1810 
1811 const struct got_error *
1812 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1813 {
1814 	const struct got_error *err = NULL;
1815 	struct got_imsg_tag_object *itag;
1816 	uint8_t *buf;
1817 	size_t len, total;
1818 	size_t tag_len = strlen(tag->tag);
1819 	size_t tagger_len = strlen(tag->tagger);
1820 	size_t tagmsg_len = strlen(tag->tagmsg);
1821 
1822 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1823 
1824 	buf = malloc(total);
1825 	if (buf == NULL)
1826 		return got_error_from_errno("malloc");
1827 
1828 	itag = (struct got_imsg_tag_object *)buf;
1829 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1830 	itag->obj_type = tag->obj_type;
1831 	itag->tag_len = tag_len;
1832 	itag->tagger_len = tagger_len;
1833 	itag->tagger_time = tag->tagger_time;
1834 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1835 	itag->tagmsg_len = tagmsg_len;
1836 
1837 	len = sizeof(*itag);
1838 	memcpy(buf + len, tag->tag, tag_len);
1839 	len += tag_len;
1840 	memcpy(buf + len, tag->tagger, tagger_len);
1841 	len += tagger_len;
1842 
1843 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1844 		err = got_error_from_errno("imsg_compose TAG");
1845 		goto done;
1846 	}
1847 
1848 	if (tagmsg_len == 0 ||
1849 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1850 		err = flush_imsg(ibuf);
1851 		if (err)
1852 			goto done;
1853 	}
1854 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1855 done:
1856 	free(buf);
1857 	return err;
1858 }
1859 
1860 const struct got_error *
1861 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1862 {
1863 	const struct got_error *err = NULL;
1864 	struct imsg imsg;
1865 	struct got_imsg_tag_object *itag;
1866 	size_t len, datalen;
1867 	const size_t min_datalen =
1868 	    MIN(sizeof(struct got_imsg_error),
1869 	    sizeof(struct got_imsg_tag_object));
1870 
1871 	*tag = NULL;
1872 
1873 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1874 	if (err)
1875 		return err;
1876 
1877 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1878 	len = 0;
1879 
1880 	switch (imsg.hdr.type) {
1881 	case GOT_IMSG_TAG:
1882 		if (datalen < sizeof(*itag)) {
1883 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1884 			break;
1885 		}
1886 		itag = imsg.data;
1887 		if (datalen != sizeof(*itag) + itag->tag_len +
1888 		    itag->tagger_len) {
1889 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1890 			break;
1891 		}
1892 		len += sizeof(*itag);
1893 
1894 		*tag = calloc(1, sizeof(**tag));
1895 		if (*tag == NULL) {
1896 			err = got_error_from_errno("calloc");
1897 			break;
1898 		}
1899 
1900 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1901 
1902 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1903 		if ((*tag)->tag == NULL) {
1904 			err = got_error_from_errno("strndup");
1905 			break;
1906 		}
1907 		len += itag->tag_len;
1908 
1909 		(*tag)->obj_type = itag->obj_type;
1910 		(*tag)->tagger_time = itag->tagger_time;
1911 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1912 
1913 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1914 		if ((*tag)->tagger == NULL) {
1915 			err = got_error_from_errno("strndup");
1916 			break;
1917 		}
1918 		len += itag->tagger_len;
1919 
1920 		if (itag->tagmsg_len == 0) {
1921 			(*tag)->tagmsg = strdup("");
1922 			if ((*tag)->tagmsg == NULL) {
1923 				err = got_error_from_errno("strdup");
1924 				break;
1925 			}
1926 		} else {
1927 			size_t offset = 0, remain = itag->tagmsg_len;
1928 
1929 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1930 			if ((*tag)->tagmsg == NULL) {
1931 				err = got_error_from_errno("malloc");
1932 				break;
1933 			}
1934 			while (remain > 0) {
1935 				struct imsg imsg_log;
1936 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1937 				    remain);
1938 
1939 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1940 				if (err)
1941 					return err;
1942 
1943 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1944 					return got_error(GOT_ERR_PRIVSEP_MSG);
1945 
1946 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1947 				    n);
1948 				imsg_free(&imsg_log);
1949 				offset += n;
1950 				remain -= n;
1951 			}
1952 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1953 		}
1954 
1955 		break;
1956 	default:
1957 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1958 		break;
1959 	}
1960 
1961 	imsg_free(&imsg);
1962 
1963 	return err;
1964 }
1965 
1966 const struct got_error *
1967 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1968     struct got_packidx *packidx)
1969 {
1970 	const struct got_error *err = NULL;
1971 	struct got_imsg_packidx ipackidx;
1972 	struct got_imsg_pack ipack;
1973 	int fd;
1974 
1975 	memset(&ipackidx, 0, sizeof(ipackidx));
1976 	memset(&ipack, 0, sizeof(ipack));
1977 
1978 	ipackidx.len = packidx->len;
1979 	ipackidx.packfile_size = pack->filesize;
1980 	fd = dup(packidx->fd);
1981 	if (fd == -1)
1982 		return got_error_from_errno("dup");
1983 
1984 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1985 	    sizeof(ipackidx)) == -1) {
1986 		err = got_error_from_errno("imsg_compose PACKIDX");
1987 		close(fd);
1988 		return err;
1989 	}
1990 
1991 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1992 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1993 		return got_error(GOT_ERR_NO_SPACE);
1994 	ipack.filesize = pack->filesize;
1995 
1996 	fd = dup(pack->fd);
1997 	if (fd == -1)
1998 		return got_error_from_errno("dup");
1999 
2000 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
2001 	    == -1) {
2002 		err = got_error_from_errno("imsg_compose PACK");
2003 		close(fd);
2004 		return err;
2005 	}
2006 
2007 	return flush_imsg(ibuf);
2008 }
2009 
2010 const struct got_error *
2011 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
2012     struct got_object_id *id)
2013 {
2014 	struct got_imsg_packed_object iobj;
2015 
2016 	memset(&iobj, 0, sizeof(iobj));
2017 	iobj.idx = idx;
2018 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2019 
2020 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2021 	    &iobj, sizeof(iobj)) == -1)
2022 		return got_error_from_errno("imsg_compose "
2023 		    "PACKED_OBJECT_REQUEST");
2024 
2025 	return flush_imsg(ibuf);
2026 }
2027 
2028 const struct got_error *
2029 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2030     struct got_object_id *id)
2031 {
2032 	struct got_imsg_packed_object iobj;
2033 
2034 	memset(&iobj, 0, sizeof(iobj));
2035 	iobj.idx = idx;
2036 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2037 
2038 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2039 	    &iobj, sizeof(iobj)) == -1)
2040 		return got_error_from_errno("imsg_compose "
2041 		    "PACKED_OBJECT_REQUEST");
2042 
2043 	return flush_imsg(ibuf);
2044 }
2045 
2046 const struct got_error *
2047 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2048 {
2049 	const struct got_error *err = NULL;
2050 
2051 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2052 	    NULL, 0) == -1) {
2053 		err = got_error_from_errno("imsg_compose "
2054 		    "GITCONFIG_PARSE_REQUEST");
2055 		close(fd);
2056 		return err;
2057 	}
2058 
2059 	return flush_imsg(ibuf);
2060 }
2061 
2062 const struct got_error *
2063 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2064 {
2065 	if (imsg_compose(ibuf,
2066 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2067 	    NULL, 0) == -1)
2068 		return got_error_from_errno("imsg_compose "
2069 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2070 
2071 	return flush_imsg(ibuf);
2072 }
2073 
2074 const struct got_error *
2075 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2076 {
2077 	if (imsg_compose(ibuf,
2078 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2079 	    NULL, 0) == -1)
2080 		return got_error_from_errno("imsg_compose "
2081 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2082 
2083 	return flush_imsg(ibuf);
2084 }
2085 
2086 
2087 const struct got_error *
2088 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2089 {
2090 	if (imsg_compose(ibuf,
2091 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2092 		return got_error_from_errno("imsg_compose "
2093 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2094 
2095 	return flush_imsg(ibuf);
2096 }
2097 
2098 const struct got_error *
2099 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2100 {
2101 	if (imsg_compose(ibuf,
2102 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2103 		return got_error_from_errno("imsg_compose "
2104 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2105 
2106 	return flush_imsg(ibuf);
2107 }
2108 
2109 const struct got_error *
2110 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2111 {
2112 	if (imsg_compose(ibuf,
2113 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2114 		return got_error_from_errno("imsg_compose "
2115 		    "GITCONFIG_REMOTE_REQUEST");
2116 
2117 	return flush_imsg(ibuf);
2118 }
2119 
2120 const struct got_error *
2121 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2122 {
2123 	if (imsg_compose(ibuf,
2124 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2125 		return got_error_from_errno("imsg_compose "
2126 		    "GITCONFIG_OWNER_REQUEST");
2127 
2128 	return flush_imsg(ibuf);
2129 }
2130 
2131 const struct got_error *
2132 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2133 {
2134 	const struct got_error *err = NULL;
2135 	struct imsg imsg;
2136 	size_t datalen;
2137 
2138 	*str = NULL;
2139 
2140 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2141 	if (err)
2142 		return err;
2143 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2144 
2145 	switch (imsg.hdr.type) {
2146 	case GOT_IMSG_GITCONFIG_STR_VAL:
2147 		if (datalen == 0)
2148 			break;
2149 		/* datalen does not include terminating \0 */
2150 		*str = malloc(datalen + 1);
2151 		if (*str == NULL) {
2152 			err = got_error_from_errno("malloc");
2153 			break;
2154 		}
2155 		memcpy(*str, imsg.data, datalen);
2156 		(*str)[datalen] = '\0';
2157 		break;
2158 	default:
2159 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2160 		break;
2161 	}
2162 
2163 	imsg_free(&imsg);
2164 	return err;
2165 }
2166 
2167 const struct got_error *
2168 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2169 {
2170 	const struct got_error *err = NULL;
2171 	struct imsg imsg;
2172 	size_t datalen;
2173 	const size_t min_datalen =
2174 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2175 
2176 	*val = 0;
2177 
2178 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2179 	if (err)
2180 		return err;
2181 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2182 
2183 	switch (imsg.hdr.type) {
2184 	case GOT_IMSG_GITCONFIG_INT_VAL:
2185 		if (datalen != sizeof(*val)) {
2186 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2187 			break;
2188 		}
2189 		memcpy(val, imsg.data, sizeof(*val));
2190 		break;
2191 	default:
2192 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2193 		break;
2194 	}
2195 
2196 	imsg_free(&imsg);
2197 	return err;
2198 }
2199 
2200 static void
2201 free_remote_data(struct got_remote_repo *remote)
2202 {
2203 	int i;
2204 
2205 	free(remote->name);
2206 	free(remote->fetch_url);
2207 	free(remote->send_url);
2208 	for (i = 0; i < remote->nfetch_branches; i++)
2209 		free(remote->fetch_branches[i]);
2210 	free(remote->fetch_branches);
2211 	for (i = 0; i < remote->nsend_branches; i++)
2212 		free(remote->send_branches[i]);
2213 	free(remote->send_branches);
2214 	for (i = 0; i < remote->nfetch_refs; i++)
2215 		free(remote->fetch_refs[i]);
2216 	free(remote->fetch_refs);
2217 }
2218 
2219 const struct got_error *
2220 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2221     int *nremotes, struct imsgbuf *ibuf)
2222 {
2223 	const struct got_error *err = NULL;
2224 	struct imsg imsg;
2225 	size_t datalen;
2226 	struct got_imsg_remotes iremotes;
2227 	struct got_imsg_remote iremote;
2228 
2229 	*remotes = NULL;
2230 	*nremotes = 0;
2231 	iremotes.nremotes = 0;
2232 
2233 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2234 	if (err)
2235 		return err;
2236 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2237 
2238 	switch (imsg.hdr.type) {
2239 	case GOT_IMSG_GITCONFIG_REMOTES:
2240 		if (datalen != sizeof(iremotes)) {
2241 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2242 			break;
2243 		}
2244 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2245 		if (iremotes.nremotes == 0) {
2246 			imsg_free(&imsg);
2247 			return NULL;
2248 		}
2249 		break;
2250 	default:
2251 		imsg_free(&imsg);
2252 		return got_error(GOT_ERR_PRIVSEP_MSG);
2253 	}
2254 
2255 	imsg_free(&imsg);
2256 
2257 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2258 	if (*remotes == NULL)
2259 		return got_error_from_errno("recallocarray");
2260 
2261 	while (*nremotes < iremotes.nremotes) {
2262 		struct got_remote_repo *remote;
2263 
2264 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2265 		if (err)
2266 			break;
2267 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2268 
2269 		switch (imsg.hdr.type) {
2270 		case GOT_IMSG_GITCONFIG_REMOTE:
2271 			remote = &(*remotes)[*nremotes];
2272 			memset(remote, 0, sizeof(*remote));
2273 			if (datalen < sizeof(iremote)) {
2274 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2275 				break;
2276 			}
2277 			memcpy(&iremote, imsg.data, sizeof(iremote));
2278 			if (iremote.name_len == 0 ||
2279 			    iremote.fetch_url_len == 0 ||
2280 			    iremote.send_url_len == 0 ||
2281 			    (sizeof(iremote) + iremote.name_len +
2282 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2283 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2284 				break;
2285 			}
2286 			remote->name = strndup(imsg.data + sizeof(iremote),
2287 			    iremote.name_len);
2288 			if (remote->name == NULL) {
2289 				err = got_error_from_errno("strndup");
2290 				break;
2291 			}
2292 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2293 			    iremote.name_len, iremote.fetch_url_len);
2294 			if (remote->fetch_url == NULL) {
2295 				err = got_error_from_errno("strndup");
2296 				free_remote_data(remote);
2297 				break;
2298 			}
2299 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2300 			    iremote.name_len + iremote.fetch_url_len,
2301 			    iremote.send_url_len);
2302 			if (remote->send_url == NULL) {
2303 				err = got_error_from_errno("strndup");
2304 				free_remote_data(remote);
2305 				break;
2306 			}
2307 			remote->mirror_references = iremote.mirror_references;
2308 			remote->fetch_all_branches = iremote.fetch_all_branches;
2309 			remote->nfetch_branches = 0;
2310 			remote->fetch_branches = NULL;
2311 			remote->nsend_branches = 0;
2312 			remote->send_branches = NULL;
2313 			remote->nfetch_refs = 0;
2314 			remote->fetch_refs = NULL;
2315 			(*nremotes)++;
2316 			break;
2317 		default:
2318 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2319 			break;
2320 		}
2321 
2322 		imsg_free(&imsg);
2323 		if (err)
2324 			break;
2325 	}
2326 
2327 	if (err) {
2328 		int i;
2329 		for (i = 0; i < *nremotes; i++)
2330 			free_remote_data(&(*remotes)[i]);
2331 		free(*remotes);
2332 		*remotes = NULL;
2333 		*nremotes = 0;
2334 	}
2335 	return err;
2336 }
2337 
2338 const struct got_error *
2339 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2340 {
2341 	const struct got_error *err = NULL;
2342 
2343 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2344 	    NULL, 0) == -1) {
2345 		err = got_error_from_errno("imsg_compose "
2346 		    "GOTCONFIG_PARSE_REQUEST");
2347 		close(fd);
2348 		return err;
2349 	}
2350 
2351 	return flush_imsg(ibuf);
2352 }
2353 
2354 const struct got_error *
2355 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2356 {
2357 	if (imsg_compose(ibuf,
2358 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2359 		return got_error_from_errno("imsg_compose "
2360 		    "GOTCONFIG_AUTHOR_REQUEST");
2361 
2362 	return flush_imsg(ibuf);
2363 }
2364 
2365 const struct got_error *
2366 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2367 {
2368 	if (imsg_compose(ibuf,
2369 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2370 		return got_error_from_errno("imsg_compose "
2371 		    "GOTCONFIG_REMOTE_REQUEST");
2372 
2373 	return flush_imsg(ibuf);
2374 }
2375 
2376 const struct got_error *
2377 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2378 {
2379 	const struct got_error *err = NULL;
2380 	struct imsg imsg;
2381 	size_t datalen;
2382 
2383 	*str = NULL;
2384 
2385 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2386 	if (err)
2387 		return err;
2388 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2389 
2390 	switch (imsg.hdr.type) {
2391 	case GOT_IMSG_ERROR:
2392 		err = recv_imsg_error(&imsg, datalen);
2393 		break;
2394 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2395 		if (datalen == 0)
2396 			break;
2397 		/* datalen does not include terminating \0 */
2398 		*str = malloc(datalen + 1);
2399 		if (*str == NULL) {
2400 			err = got_error_from_errno("malloc");
2401 			break;
2402 		}
2403 		memcpy(*str, imsg.data, datalen);
2404 		(*str)[datalen] = '\0';
2405 		break;
2406 	default:
2407 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2408 		break;
2409 	}
2410 
2411 	imsg_free(&imsg);
2412 	return err;
2413 }
2414 
2415 const struct got_error *
2416 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2417     int *nremotes, struct imsgbuf *ibuf)
2418 {
2419 	const struct got_error *err = NULL;
2420 	struct imsg imsg;
2421 	size_t datalen;
2422 	struct got_imsg_remotes iremotes;
2423 	struct got_imsg_remote iremote;
2424 	const size_t min_datalen =
2425 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2426 
2427 	*remotes = NULL;
2428 	*nremotes = 0;
2429 	iremotes.nremotes = 0;
2430 
2431 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2432 	if (err)
2433 		return err;
2434 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2435 
2436 	switch (imsg.hdr.type) {
2437 	case GOT_IMSG_ERROR:
2438 		err = recv_imsg_error(&imsg, datalen);
2439 		break;
2440 	case GOT_IMSG_GOTCONFIG_REMOTES:
2441 		if (datalen != sizeof(iremotes)) {
2442 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2443 			break;
2444 		}
2445 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2446 		if (iremotes.nremotes < 0) {
2447 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2448 			break;
2449 		}
2450 		if (iremotes.nremotes == 0) {
2451 			imsg_free(&imsg);
2452 			return NULL;
2453 		}
2454 		break;
2455 	default:
2456 		imsg_free(&imsg);
2457 		return got_error(GOT_ERR_PRIVSEP_MSG);
2458 	}
2459 
2460 	imsg_free(&imsg);
2461 
2462 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2463 	if (*remotes == NULL)
2464 		return got_error_from_errno("recallocarray");
2465 
2466 	while (*nremotes < iremotes.nremotes) {
2467 		struct got_remote_repo *remote;
2468 		const size_t min_datalen =
2469 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2470 		int i;
2471 
2472 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2473 		if (err)
2474 			break;
2475 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2476 
2477 		switch (imsg.hdr.type) {
2478 		case GOT_IMSG_ERROR:
2479 			err = recv_imsg_error(&imsg, datalen);
2480 			break;
2481 		case GOT_IMSG_GOTCONFIG_REMOTE:
2482 			remote = &(*remotes)[*nremotes];
2483 			memset(remote, 0, sizeof(*remote));
2484 			if (datalen < sizeof(iremote)) {
2485 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2486 				break;
2487 			}
2488 			memcpy(&iremote, imsg.data, sizeof(iremote));
2489 			if (iremote.name_len == 0 ||
2490 			    (iremote.fetch_url_len == 0 &&
2491 			    iremote.send_url_len == 0) ||
2492 			    (sizeof(iremote) + iremote.name_len +
2493 			    iremote.fetch_url_len + iremote.send_url_len) >
2494 			    datalen) {
2495 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2496 				break;
2497 			}
2498 			remote->name = strndup(imsg.data + sizeof(iremote),
2499 			    iremote.name_len);
2500 			if (remote->name == NULL) {
2501 				err = got_error_from_errno("strndup");
2502 				break;
2503 			}
2504 			remote->fetch_url = strndup(imsg.data +
2505 			    sizeof(iremote) + iremote.name_len,
2506 			    iremote.fetch_url_len);
2507 			if (remote->fetch_url == NULL) {
2508 				err = got_error_from_errno("strndup");
2509 				free_remote_data(remote);
2510 				break;
2511 			}
2512 			remote->send_url = strndup(imsg.data +
2513 			    sizeof(iremote) + iremote.name_len +
2514 			    iremote.fetch_url_len, iremote.send_url_len);
2515 			if (remote->send_url == NULL) {
2516 				err = got_error_from_errno("strndup");
2517 				free_remote_data(remote);
2518 				break;
2519 			}
2520 			remote->mirror_references = iremote.mirror_references;
2521 			remote->fetch_all_branches = iremote.fetch_all_branches;
2522 			if (iremote.nfetch_branches > 0) {
2523 				remote->fetch_branches = recallocarray(NULL, 0,
2524 				    iremote.nfetch_branches, sizeof(char *));
2525 				if (remote->fetch_branches == NULL) {
2526 					err = got_error_from_errno("calloc");
2527 					free_remote_data(remote);
2528 					break;
2529 				}
2530 			}
2531 			remote->nfetch_branches = 0;
2532 			for (i = 0; i < iremote.nfetch_branches; i++) {
2533 				char *branch;
2534 				err = got_privsep_recv_gotconfig_str(&branch,
2535 				    ibuf);
2536 				if (err) {
2537 					free_remote_data(remote);
2538 					goto done;
2539 				}
2540 				remote->fetch_branches[i] = branch;
2541 				remote->nfetch_branches++;
2542 			}
2543 			if (iremote.nsend_branches > 0) {
2544 				remote->send_branches = recallocarray(NULL, 0,
2545 				    iremote.nsend_branches, sizeof(char *));
2546 				if (remote->send_branches == NULL) {
2547 					err = got_error_from_errno("calloc");
2548 					free_remote_data(remote);
2549 					break;
2550 				}
2551 			}
2552 			remote->nsend_branches = 0;
2553 			for (i = 0; i < iremote.nsend_branches; i++) {
2554 				char *branch;
2555 				err = got_privsep_recv_gotconfig_str(&branch,
2556 				    ibuf);
2557 				if (err) {
2558 					free_remote_data(remote);
2559 					goto done;
2560 				}
2561 				remote->send_branches[i] = branch;
2562 				remote->nsend_branches++;
2563 			}
2564 			if (iremote.nfetch_refs > 0) {
2565 				remote->fetch_refs = recallocarray(NULL, 0,
2566 				    iremote.nfetch_refs, sizeof(char *));
2567 				if (remote->fetch_refs == NULL) {
2568 					err = got_error_from_errno("calloc");
2569 					free_remote_data(remote);
2570 					break;
2571 				}
2572 			}
2573 			remote->nfetch_refs = 0;
2574 			for (i = 0; i < iremote.nfetch_refs; i++) {
2575 				char *ref;
2576 				err = got_privsep_recv_gotconfig_str(&ref,
2577 				    ibuf);
2578 				if (err) {
2579 					free_remote_data(remote);
2580 					goto done;
2581 				}
2582 				remote->fetch_refs[i] = ref;
2583 				remote->nfetch_refs++;
2584 			}
2585 			(*nremotes)++;
2586 			break;
2587 		default:
2588 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2589 			break;
2590 		}
2591 
2592 		imsg_free(&imsg);
2593 		if (err)
2594 			break;
2595 	}
2596 done:
2597 	if (err) {
2598 		int i;
2599 		for (i = 0; i < *nremotes; i++)
2600 			free_remote_data(&(*remotes)[i]);
2601 		free(*remotes);
2602 		*remotes = NULL;
2603 		*nremotes = 0;
2604 	}
2605 	return err;
2606 }
2607 
2608 const struct got_error *
2609 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2610     struct got_object_id *id, int idx, const char *path)
2611 {
2612 	struct ibuf *wbuf;
2613 	size_t path_len = strlen(path) + 1;
2614 
2615 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2616 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2617 	if (wbuf == NULL)
2618 		return got_error_from_errno(
2619 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2620 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2621 		return got_error_from_errno("imsg_add "
2622 		    "COMMIT_TRAVERSAL_REQUEST");
2623 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2624 		return got_error_from_errno("imsg_add "
2625 		    "COMMIT_TRAVERSAL_REQUEST");
2626 	if (imsg_add(wbuf, path, path_len) == -1)
2627 		return got_error_from_errno("imsg_add "
2628 		    "COMMIT_TRAVERSAL_REQUEST");
2629 
2630 	wbuf->fd = -1;
2631 	imsg_close(ibuf, wbuf);
2632 
2633 	return flush_imsg(ibuf);
2634 }
2635 
2636 const struct got_error *
2637 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2638     struct got_object_id **changed_commit_id,
2639     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2640 {
2641 	const struct got_error *err = NULL;
2642 	struct imsg imsg;
2643 	struct got_imsg_traversed_commits *icommits;
2644 	size_t datalen;
2645 	int i, done = 0;
2646 
2647 	*changed_commit = NULL;
2648 	*changed_commit_id = NULL;
2649 
2650 	while (!done) {
2651 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2652 		if (err)
2653 			return err;
2654 
2655 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2656 		switch (imsg.hdr.type) {
2657 		case GOT_IMSG_TRAVERSED_COMMITS:
2658 			icommits = imsg.data;
2659 			if (datalen != sizeof(*icommits) +
2660 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2661 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2662 				break;
2663 			}
2664 			for (i = 0; i < icommits->ncommits; i++) {
2665 				struct got_object_qid *qid;
2666 				uint8_t *sha1 = (uint8_t *)imsg.data +
2667 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2668 				err = got_object_qid_alloc_partial(&qid);
2669 				if (err)
2670 					break;
2671 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2672 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2673 
2674 				/* The last commit may contain a change. */
2675 				if (i == icommits->ncommits - 1) {
2676 					*changed_commit_id =
2677 					    got_object_id_dup(&qid->id);
2678 					if (*changed_commit_id == NULL) {
2679 						err = got_error_from_errno(
2680 						    "got_object_id_dup");
2681 						break;
2682 					}
2683 				}
2684 			}
2685 			break;
2686 		case GOT_IMSG_COMMIT:
2687 			if (*changed_commit_id == NULL) {
2688 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2689 				break;
2690 			}
2691 			err = get_commit_from_imsg(changed_commit, &imsg,
2692 			    datalen, ibuf);
2693 			break;
2694 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2695 			done = 1;
2696 			break;
2697 		default:
2698 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2699 			break;
2700 		}
2701 
2702 		imsg_free(&imsg);
2703 		if (err)
2704 			break;
2705 	}
2706 
2707 	if (err)
2708 		got_object_id_queue_free(commit_ids);
2709 	return err;
2710 }
2711 
2712 const struct got_error *
2713 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2714     struct got_object_id *tree_id, const char *path,
2715     struct got_parsed_tree_entry *entries, int nentries)
2716 {
2717 	const struct got_error *err = NULL;
2718 	struct ibuf *wbuf;
2719 	size_t path_len = strlen(path);
2720 	size_t msglen;
2721 
2722 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2723 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2724 	if (wbuf == NULL)
2725 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2726 
2727 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2728 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2729 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2730 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2731 	if (imsg_add(wbuf, path, path_len) == -1)
2732 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2733 
2734 	wbuf->fd = -1;
2735 	imsg_close(ibuf, wbuf);
2736 
2737 	if (entries) {
2738 		err = send_tree_entries(ibuf, entries, nentries);
2739 		if (err)
2740 			return err;
2741 	}
2742 
2743 	return flush_imsg(ibuf);
2744 }
2745 
2746 const struct got_error *
2747 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2748 {
2749 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2750 	    0, 0, -1, NULL, 0) == -1)
2751 		return got_error_from_errno("imsg_compose "
2752 		    "OBJECT_ENUMERATION_REQUEST");
2753 
2754 	return flush_imsg(ibuf);
2755 }
2756 
2757 const struct got_error *
2758 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2759 {
2760 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2761 	    0, 0, -1, NULL, 0) == -1)
2762 		return got_error_from_errno("imsg_compose "
2763 		    "OBJECT_ENUMERATION_DONE");
2764 
2765 	return flush_imsg(ibuf);
2766 }
2767 
2768 const struct got_error *
2769 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2770 {
2771 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2772 	    0, 0, -1, NULL, 0) == -1)
2773 		return got_error_from_errno("imsg_compose "
2774 		    "OBJECT_ENUMERATION_INCOMPLETE");
2775 
2776 	return flush_imsg(ibuf);
2777 }
2778 
2779 const struct got_error *
2780 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2781     struct got_object_id *id, time_t mtime)
2782 {
2783 	struct ibuf *wbuf;
2784 
2785 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2786 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2787 	if (wbuf == NULL)
2788 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2789 
2790 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2791 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2792 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2793 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2794 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2795 
2796 	wbuf->fd = -1;
2797 	imsg_close(ibuf, wbuf);
2798 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2799 	return NULL;
2800 }
2801 
2802 const struct got_error *
2803 got_privsep_recv_enumerated_objects(int *found_all_objects,
2804     struct imsgbuf *ibuf,
2805     got_object_enumerate_commit_cb cb_commit,
2806     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2807     struct got_repository *repo)
2808 {
2809 	const struct got_error *err = NULL;
2810 	struct imsg imsg;
2811 	struct got_imsg_enumerated_commit *icommit = NULL;
2812 	struct got_object_id commit_id;
2813 	int have_commit = 0;
2814 	time_t mtime = 0;
2815 	struct got_tree_object tree;
2816 	struct got_imsg_enumerated_tree *itree;
2817 	struct got_object_id tree_id;
2818 	char *path = NULL, *canon_path = NULL;
2819 	size_t datalen, path_len;
2820 	int nentries = -1;
2821 	int done = 0;
2822 
2823 	*found_all_objects = 0;
2824 	memset(&tree, 0, sizeof(tree));
2825 
2826 	while (!done) {
2827 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2828 		if (err)
2829 			break;
2830 
2831 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2832 		switch (imsg.hdr.type) {
2833 		case GOT_IMSG_ENUMERATED_COMMIT:
2834 			if (have_commit && nentries != -1) {
2835 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2836 				break;
2837 			}
2838 			if (datalen != sizeof(*icommit)) {
2839 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2840 				break;
2841 			}
2842 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2843 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2844 			mtime = icommit->mtime;
2845 			have_commit = 1;
2846 			break;
2847 		case GOT_IMSG_ENUMERATED_TREE:
2848 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2849 			if (!have_commit) {
2850 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2851 				break;
2852 			}
2853 			if (datalen < sizeof(*itree)) {
2854 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2855 				break;
2856 			}
2857 			itree = imsg.data;
2858 			path_len = datalen - sizeof(*itree);
2859 			if (path_len == 0) {
2860 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2861 				break;
2862 			}
2863 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2864 			free(path);
2865 			path = malloc(path_len + 1);
2866 			if (path == NULL) {
2867 				err = got_error_from_errno("malloc");
2868 				break;
2869 			}
2870 			free(canon_path);
2871 			canon_path = malloc(path_len + 1);
2872 			if (canon_path == NULL) {
2873 				err = got_error_from_errno("malloc");
2874 				break;
2875 			}
2876 			memcpy(path, (uint8_t *)imsg.data + sizeof(*itree),
2877 			    path_len);
2878 			path[path_len] = '\0';
2879 			if (!got_path_is_absolute(path)) {
2880 				err = got_error(GOT_ERR_BAD_PATH);
2881 				break;
2882 			}
2883 			if (got_path_is_root_dir(path)) {
2884 				/* XXX check what got_canonpath() does wrong */
2885 				canon_path[0] = '/';
2886 				canon_path[1] = '\0';
2887 			} else {
2888 				err = got_canonpath(path, canon_path,
2889 				    path_len + 1);
2890 				if (err)
2891 					break;
2892 			}
2893 			if (strcmp(path, canon_path) != 0) {
2894 				err = got_error(GOT_ERR_BAD_PATH);
2895 				break;
2896 			}
2897 			if (nentries != -1) {
2898 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2899 				break;
2900 			}
2901 			if (itree->nentries < -1) {
2902 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2903 				break;
2904 			}
2905 			if (itree->nentries == -1) {
2906 				/* Tree was not found in pack file. */
2907 				done = 1;
2908 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2909 				    path, repo);
2910 				break;
2911 			}
2912 			if (itree->nentries > INT_MAX) {
2913 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2914 				break;
2915 			}
2916 			tree.entries = calloc(itree->nentries,
2917 			    sizeof(struct got_tree_entry));
2918 			if (tree.entries == NULL) {
2919 				err = got_error_from_errno("calloc");
2920 				break;
2921 			}
2922 			if (itree->nentries == 0) {
2923 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2924 				    path, repo);
2925 				if (err)
2926 					break;
2927 
2928 				/* Prepare for next tree. */
2929 				free(tree.entries);
2930 				memset(&tree, 0, sizeof(tree));
2931 				nentries = -1;
2932 			} else {
2933 				tree.nentries = itree->nentries;
2934 				nentries = 0;
2935 			}
2936 			break;
2937 		case GOT_IMSG_TREE_ENTRIES:
2938 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2939 			if (nentries <= -1) {
2940 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2941 				break;
2942 			}
2943 			err = recv_tree_entries(imsg.data, datalen,
2944 			    &tree, &nentries);
2945 			if (err)
2946 				break;
2947 			if (tree.nentries == nentries) {
2948 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2949 				    path, repo);
2950 				if (err)
2951 					break;
2952 
2953 				/* Prepare for next tree. */
2954 				free(tree.entries);
2955 				memset(&tree, 0, sizeof(tree));
2956 				nentries = -1;
2957 			}
2958 			break;
2959 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2960 			/* All trees have been found and traversed. */
2961 			if (!have_commit || path == NULL || nentries != -1) {
2962 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2963 				break;
2964 			}
2965 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2966 			if (err)
2967 				break;
2968 			have_commit = 0;
2969 			break;
2970 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2971 			*found_all_objects = 1;
2972 			done = 1;
2973 			break;
2974 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
2975 			done = 1;
2976 			break;
2977 		default:
2978 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2979 			break;
2980 		}
2981 
2982 		imsg_free(&imsg);
2983 		if (err)
2984 			break;
2985 	}
2986 
2987 	free(path);
2988 	free(canon_path);
2989 	free(tree.entries);
2990 	return err;
2991 }
2992 
2993 const struct got_error *
2994 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2995     struct got_object_id *id)
2996 {
2997 	struct got_imsg_raw_delta_request dreq;
2998 
2999 	memset(&dreq, 0, sizeof(dreq));
3000 	dreq.idx = idx;
3001 	memcpy(dreq.id, id->sha1, SHA1_DIGEST_LENGTH);
3002 
3003 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3004 	    &dreq, sizeof(dreq)) == -1)
3005 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3006 
3007 	return flush_imsg(ibuf);
3008 }
3009 
3010 const struct got_error *
3011 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3012 {
3013 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3014 }
3015 
3016 const struct got_error *
3017 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3018     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3019     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3020 {
3021 	struct got_imsg_raw_delta idelta;
3022 	int ret;
3023 
3024 	memset(&idelta, 0, sizeof(idelta));
3025 	idelta.base_size = base_size;
3026 	idelta.result_size = result_size;
3027 	idelta.delta_size = delta_size;
3028 	idelta.delta_compressed_size = delta_compressed_size;
3029 	idelta.delta_offset = delta_offset;
3030 	idelta.delta_out_offset = delta_out_offset;
3031 	memcpy(idelta.base_id, base_id->sha1, SHA1_DIGEST_LENGTH);
3032 
3033 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3034 	    &idelta, sizeof(idelta));
3035 	if (ret == -1)
3036 		return got_error_from_errno("imsg_compose RAW_DELTA");
3037 
3038 	return flush_imsg(ibuf);
3039 }
3040 
3041 const struct got_error *
3042 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3043     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3044     off_t *delta_out_offset, struct got_object_id **base_id, struct imsgbuf *ibuf)
3045 {
3046 	const struct got_error *err = NULL;
3047 	struct imsg imsg;
3048 	struct got_imsg_raw_delta *delta;
3049 	size_t datalen;
3050 
3051 	*base_size = 0;
3052 	*result_size = 0;
3053 	*delta_size = 0;
3054 	*delta_compressed_size = 0;
3055 	*delta_offset = 0;
3056 	*delta_out_offset = 0;
3057 	*base_id = NULL;
3058 
3059 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3060 	if (err)
3061 		return err;
3062 
3063 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3064 
3065 	switch (imsg.hdr.type) {
3066 	case GOT_IMSG_RAW_DELTA:
3067 		if (datalen != sizeof(*delta)) {
3068 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3069 			break;
3070 		}
3071 		delta = imsg.data;
3072 		*base_size = delta->base_size;
3073 		*result_size = delta->result_size;
3074 		*delta_size = delta->delta_size;
3075 		*delta_compressed_size = delta->delta_compressed_size;
3076 		*delta_offset = delta->delta_offset;
3077 		*delta_out_offset = delta->delta_out_offset;
3078 		*base_id = calloc(1, sizeof(**base_id));
3079 		if (*base_id == NULL) {
3080 			err = got_error_from_errno("malloc");
3081 			break;
3082 		}
3083 		memcpy((*base_id)->sha1, delta->base_id, SHA1_DIGEST_LENGTH);
3084 		break;
3085 	default:
3086 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3087 		break;
3088 	}
3089 
3090 	imsg_free(&imsg);
3091 
3092 	if (err) {
3093 		free(*base_id);
3094 		*base_id = NULL;
3095 	}
3096 	return err;
3097 }
3098 
3099 static const struct got_error *
3100 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3101 {
3102 	const struct got_error *err = NULL;
3103 	struct got_imsg_object_idlist idlist;
3104 	struct ibuf *wbuf;
3105 	size_t i;
3106 
3107 	memset(&idlist, 0, sizeof(idlist));
3108 
3109 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3110 		return got_error(GOT_ERR_NO_SPACE);
3111 
3112 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3113 	    sizeof(idlist) + nids * sizeof(**ids));
3114 	if (wbuf == NULL) {
3115 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3116 		return err;
3117 	}
3118 
3119 	idlist.nids = nids;
3120 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3121 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3122 
3123 	for (i = 0; i < nids; i++) {
3124 		struct got_object_id *id = ids[i];
3125 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3126 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3127 	}
3128 
3129 	wbuf->fd = -1;
3130 	imsg_close(ibuf, wbuf);
3131 
3132 	return flush_imsg(ibuf);
3133 }
3134 
3135 const struct got_error *
3136 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3137     struct got_object_id **ids, size_t nids)
3138 {
3139 	const struct got_error *err = NULL;
3140 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3141 	int i, queued = 0;
3142 
3143 	for (i = 0; i < nids; i++) {
3144 		idlist[i % nitems(idlist)] = ids[i];
3145 		queued++;
3146 		if (queued >= nitems(idlist)) {
3147 			err = send_idlist(ibuf, idlist, queued);
3148 			if (err)
3149 				return err;
3150 			queued = 0;
3151 		}
3152 	}
3153 
3154 	if (queued > 0) {
3155 		err = send_idlist(ibuf, idlist, queued);
3156 		if (err)
3157 			return err;
3158 	}
3159 
3160 	return NULL;
3161 }
3162 
3163 const struct got_error *
3164 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3165 {
3166 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3167 	    == -1)
3168 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3169 
3170 	return flush_imsg(ibuf);
3171 }
3172 
3173 const struct got_error *
3174 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3175     size_t *nids, struct imsgbuf *ibuf)
3176 {
3177 	const struct got_error *err = NULL;
3178 	struct imsg imsg;
3179 	struct got_imsg_object_idlist *idlist;
3180 	size_t datalen;
3181 
3182 	*ids = NULL;
3183 	*done = 0;
3184 	*nids = 0;
3185 
3186 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3187 	if (err)
3188 		return err;
3189 
3190 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3191 	switch (imsg.hdr.type) {
3192 	case GOT_IMSG_OBJ_ID_LIST:
3193 		if (datalen < sizeof(*idlist)) {
3194 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3195 			break;
3196 		}
3197 		idlist = imsg.data;
3198 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3199 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3200 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3201 			break;
3202 		}
3203 		*nids = idlist->nids;
3204 		*ids = calloc(*nids, sizeof(**ids));
3205 		if (*ids == NULL) {
3206 			err = got_error_from_errno("calloc");
3207 			break;
3208 		}
3209 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3210 		    *nids * sizeof(**ids));
3211 		break;
3212 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3213 		*done = 1;
3214 		break;
3215 	default:
3216 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3217 		break;
3218 	}
3219 
3220 	imsg_free(&imsg);
3221 
3222 	return err;
3223 }
3224 
3225 const struct got_error *
3226 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3227 {
3228 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3229 	    == -1)
3230 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3231 
3232 	return flush_imsg(ibuf);
3233 }
3234 
3235 const struct got_error *
3236 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3237     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3238 {
3239 	const struct got_error *err = NULL;
3240 	struct ibuf *wbuf;
3241 	struct got_imsg_reused_deltas ideltas;
3242 	size_t i;
3243 
3244 	memset(&ideltas, 0, sizeof(ideltas));
3245 
3246 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3247 		return got_error(GOT_ERR_NO_SPACE);
3248 
3249 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3250 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3251 	if (wbuf == NULL) {
3252 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3253 		return err;
3254 	}
3255 
3256 	ideltas.ndeltas = ndeltas;
3257 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3258 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3259 
3260 	for (i = 0; i < ndeltas; i++) {
3261 		struct got_imsg_reused_delta *delta = &deltas[i];
3262 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3263 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3264 	}
3265 
3266 	wbuf->fd = -1;
3267 	imsg_close(ibuf, wbuf);
3268 
3269 	return flush_imsg(ibuf);
3270 }
3271 
3272 const struct got_error *
3273 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3274 {
3275 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3276 	    == -1)
3277 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3278 
3279 	return flush_imsg(ibuf);
3280 }
3281 
3282 const struct got_error *
3283 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3284     size_t *ndeltas, struct imsgbuf *ibuf)
3285 {
3286 	const struct got_error *err = NULL;
3287 	struct imsg imsg;
3288 	struct got_imsg_reused_deltas *ideltas;
3289 	size_t datalen;
3290 
3291 	*done = 0;
3292 	*ndeltas = 0;
3293 
3294 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3295 	if (err)
3296 		return err;
3297 
3298 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3299 	switch (imsg.hdr.type) {
3300 	case GOT_IMSG_REUSED_DELTAS:
3301 		if (datalen < sizeof(*ideltas)) {
3302 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3303 			break;
3304 		}
3305 		ideltas = imsg.data;
3306 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3307 		    ideltas->ndeltas * sizeof(*deltas) >
3308 		    datalen - sizeof(*ideltas)) {
3309 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3310 			break;
3311 		}
3312 		*ndeltas = ideltas->ndeltas;
3313 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3314 		    *ndeltas * sizeof(*deltas));
3315 		break;
3316 	case GOT_IMSG_DELTA_REUSE_DONE:
3317 		*done = 1;
3318 		break;
3319 	default:
3320 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3321 		break;
3322 	}
3323 
3324 	imsg_free(&imsg);
3325 
3326 	return err;
3327 }
3328 
3329 const struct got_error *
3330 got_privsep_unveil_exec_helpers(void)
3331 {
3332 	const char *helpers[] = {
3333 	    GOT_PATH_PROG_READ_PACK,
3334 	    GOT_PATH_PROG_READ_OBJECT,
3335 	    GOT_PATH_PROG_READ_COMMIT,
3336 	    GOT_PATH_PROG_READ_TREE,
3337 	    GOT_PATH_PROG_READ_BLOB,
3338 	    GOT_PATH_PROG_READ_TAG,
3339 	    GOT_PATH_PROG_READ_GITCONFIG,
3340 	    GOT_PATH_PROG_READ_GOTCONFIG,
3341 	    GOT_PATH_PROG_READ_PATCH,
3342 	    GOT_PATH_PROG_FETCH_PACK,
3343 	    GOT_PATH_PROG_INDEX_PACK,
3344 	    GOT_PATH_PROG_SEND_PACK,
3345 	};
3346 	size_t i;
3347 
3348 	for (i = 0; i < nitems(helpers); i++) {
3349 		if (unveil(helpers[i], "x") == 0)
3350 			continue;
3351 		return got_error_from_errno2("unveil", helpers[i]);
3352 	}
3353 
3354 	return NULL;
3355 }
3356 
3357 void
3358 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3359 {
3360 	if (close(imsg_fds[0]) == -1) {
3361 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3362 		_exit(1);
3363 	}
3364 
3365 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3366 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3367 		_exit(1);
3368 	}
3369 
3370 	closefrom(GOT_IMSG_FD_CHILD + 1);
3371 
3372 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3373 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3374 		    strerror(errno));
3375 		_exit(1);
3376 	}
3377 }