1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <unistd.h>
33 #include <zlib.h>
34 
35 #include "got_compat.h"
36 
37 #include "got_object.h"
38 #include "got_error.h"
39 #include "got_path.h"
40 #include "got_repository.h"
41 
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49 #include "got_lib_poll.h"
50 
51 #include "got_privsep.h"
52 
53 #ifndef MIN
54 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 #endif
56 
57 #ifndef nitems
58 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
59 #endif
60 
61 static const struct got_error *
62 read_imsg(struct imsgbuf *ibuf)
63 {
64 	const struct got_error *err;
65 	size_t n;
66 
67 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
68 	if (err) {
69 		if (err->code == GOT_ERR_EOF)
70 			return got_error(GOT_ERR_PRIVSEP_PIPE);
71 		return err;
72 	}
73 
74 	n = imsg_read(ibuf);
75 	if (n == -1) {
76 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
77 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
78 		return got_error(GOT_ERR_PRIVSEP_READ);
79 	}
80 	if (n == 0)
81 		return got_error(GOT_ERR_PRIVSEP_PIPE);
82 
83 	return NULL;
84 }
85 
86 const struct got_error *
87 got_privsep_wait_for_child(pid_t pid)
88 {
89 	int child_status;
90 
91 	if (waitpid(pid, &child_status, 0) == -1)
92 		return got_error_from_errno("waitpid");
93 
94 	if (!WIFEXITED(child_status))
95 		return got_error(GOT_ERR_PRIVSEP_DIED);
96 
97 	if (WEXITSTATUS(child_status) != 0)
98 		return got_error(GOT_ERR_PRIVSEP_EXIT);
99 
100 	return NULL;
101 }
102 
103 static const struct got_error *
104 recv_imsg_error(struct imsg *imsg, size_t datalen)
105 {
106 	struct got_imsg_error *ierr;
107 
108 	if (datalen != sizeof(*ierr))
109 		return got_error(GOT_ERR_PRIVSEP_LEN);
110 
111 	ierr = imsg->data;
112 	if (ierr->code == GOT_ERR_ERRNO) {
113 		static struct got_error serr;
114 		serr.code = GOT_ERR_ERRNO;
115 		serr.msg = strerror(ierr->errno_code);
116 		return &serr;
117 	}
118 
119 	return got_error(ierr->code);
120 }
121 
122 const struct got_error *
123 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
124     size_t min_datalen)
125 {
126 	const struct got_error *err;
127 	ssize_t n;
128 
129 	n = imsg_get(ibuf, imsg);
130 	if (n == -1)
131 		return got_error_from_errno("imsg_get");
132 
133 	while (n == 0) {
134 		err = read_imsg(ibuf);
135 		if (err)
136 			return err;
137 		n = imsg_get(ibuf, imsg);
138 		if (n == -1)
139 			return got_error_from_errno("imsg_get");
140 	}
141 
142 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
143 		return got_error(GOT_ERR_PRIVSEP_LEN);
144 
145 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
146 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
147 		return recv_imsg_error(imsg, datalen);
148 	}
149 
150 	return NULL;
151 }
152 
153 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
154 void
155 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
156 {
157 	const struct got_error *poll_err;
158 	struct got_imsg_error ierr;
159 	int ret;
160 
161 	ierr.code = err->code;
162 	if (err->code == GOT_ERR_ERRNO)
163 		ierr.errno_code = errno;
164 	else
165 		ierr.errno_code = 0;
166 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
167 	if (ret == -1) {
168 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
169 		    getprogname(), err->code, err->msg, strerror(errno));
170 		return;
171 	}
172 
173 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
174 	if (poll_err) {
175 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
176 		    getprogname(), err->code, err->msg, poll_err->msg);
177 		return;
178 	}
179 
180 	ret = imsg_flush(ibuf);
181 	if (ret == -1) {
182 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
183 		    getprogname(), err->code, err->msg, strerror(errno));
184 		imsg_clear(ibuf);
185 		return;
186 	}
187 }
188 
189 static const struct got_error *
190 flush_imsg(struct imsgbuf *ibuf)
191 {
192 	const struct got_error *err;
193 
194 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
195 	if (err)
196 		return err;
197 
198 	if (imsg_flush(ibuf) == -1) {
199 		imsg_clear(ibuf);
200 		return got_error_from_errno("imsg_flush");
201 	}
202 
203 	return NULL;
204 }
205 
206 const struct got_error *
207 got_privsep_flush_imsg(struct imsgbuf *ibuf)
208 {
209 	return flush_imsg(ibuf);
210 }
211 
212 const struct got_error *
213 got_privsep_send_stop(int fd)
214 {
215 	const struct got_error *err = NULL;
216 	struct imsgbuf ibuf;
217 
218 	imsg_init(&ibuf, fd);
219 
220 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
221 		return got_error_from_errno("imsg_compose STOP");
222 
223 	err = flush_imsg(&ibuf);
224 	return err;
225 }
226 
227 const struct got_error *
228 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
229     struct got_object_id *id)
230 {
231 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
232 	    id, sizeof(*id)) == -1)
233 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
234 
235 	return flush_imsg(ibuf);
236 }
237 
238 const struct got_error *
239 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
240     struct got_object_id *id)
241 {
242 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
243 	    id, sizeof(*id)) == -1)
244 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
245 
246 	return flush_imsg(ibuf);
247 }
248 
249 const struct got_error *
250 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
251 {
252 	const struct got_error *err = NULL;
253 
254 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
255 	    == -1) {
256 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
257 		close(outfd);
258 		return err;
259 	}
260 
261 	return flush_imsg(ibuf);
262 }
263 
264 const struct got_error *
265 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
266     uint8_t *data)
267 {
268 	const struct got_error *err = NULL;
269 	struct got_imsg_raw_obj iobj;
270 	size_t len = sizeof(iobj);
271 	struct ibuf *wbuf;
272 
273 	memset(&iobj, 0, sizeof(iobj));
274 	iobj.hdrlen = hdrlen;
275 	iobj.size = size;
276 
277 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
278 		len += (size_t)size + hdrlen;
279 
280 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
281 	if (wbuf == NULL) {
282 		err = got_error_from_errno("imsg_create RAW_OBJECT");
283 		return err;
284 	}
285 
286 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
287 		return got_error_from_errno("imsg_add RAW_OBJECT");
288 
289 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
290 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
291 			return got_error_from_errno("imsg_add RAW_OBJECT");
292 	}
293 
294 	wbuf->fd = -1;
295 	imsg_close(ibuf, wbuf);
296 
297 	return flush_imsg(ibuf);
298 }
299 
300 const struct got_error *
301 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
302     struct imsgbuf *ibuf)
303 {
304 	const struct got_error *err = NULL;
305 	struct imsg imsg;
306 	struct got_imsg_raw_obj *iobj;
307 	size_t datalen;
308 
309 	*outbuf = NULL;
310 
311 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
312 	if (err)
313 		return err;
314 
315 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
316 
317 	switch (imsg.hdr.type) {
318 	case GOT_IMSG_RAW_OBJECT:
319 		if (datalen < sizeof(*iobj)) {
320 			err = got_error(GOT_ERR_PRIVSEP_LEN);
321 			break;
322 		}
323 		iobj = imsg.data;
324 		*size = iobj->size;
325 		*hdrlen = iobj->hdrlen;
326 
327 		if (datalen == sizeof(*iobj)) {
328 			/* Data has been written to file descriptor. */
329 			break;
330 		}
331 
332 		if (*size < 0 ||
333 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
334 			err = got_error(GOT_ERR_PRIVSEP_LEN);
335 			break;
336 		}
337 
338 		*outbuf = malloc(*size + *hdrlen);
339 		if (*outbuf == NULL) {
340 			err = got_error_from_errno("malloc");
341 			break;
342 		}
343 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
344 		break;
345 	default:
346 		err = got_error(GOT_ERR_PRIVSEP_MSG);
347 		break;
348 	}
349 
350 	imsg_free(&imsg);
351 
352 	return err;
353 }
354 
355 const struct got_error *
356 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
357     struct got_object_id *id, int pack_idx)
358 {
359 	const struct got_error *err = NULL;
360 	struct got_imsg_packed_object iobj;
361 	void *data;
362 	size_t len;
363 
364 	memset(&iobj, 0, sizeof(iobj));
365 	if (pack_idx != -1) { /* commit is packed */
366 		iobj.idx = pack_idx;
367 		memcpy(&iobj.id, id, sizeof(iobj.id));
368 		data = &iobj;
369 		len = sizeof(iobj);
370 	} else {
371 		data = id;
372 		len = sizeof(*id);
373 	}
374 
375 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
376 	    == -1) {
377 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
378 		close(fd);
379 		return err;
380 	}
381 
382 	return flush_imsg(ibuf);
383 }
384 
385 const struct got_error *
386 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
387     struct got_object_id *id, int pack_idx)
388 {
389 	struct ibuf *wbuf;
390 	size_t len;
391 
392 	if (pack_idx != -1)
393 		len = sizeof(struct got_imsg_packed_object);
394 	else
395 		len = sizeof(*id);
396 
397 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
398 	if (wbuf == NULL)
399 		return got_error_from_errno("imsg_create TREE_REQUEST");
400 
401 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
402 		return got_error_from_errno("imsg_add TREE_REQUEST");
403 
404 	if (pack_idx != -1) { /* tree is packed */
405 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
406 			return got_error_from_errno("imsg_add TREE_REQUEST");
407 	}
408 
409 	wbuf->fd = fd;
410 	imsg_close(ibuf, wbuf);
411 
412 	return flush_imsg(ibuf);
413 }
414 
415 const struct got_error *
416 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
417     struct got_object_id *id, int pack_idx)
418 {
419 	struct got_imsg_packed_object iobj;
420 	void *data;
421 	size_t len;
422 
423 	memset(&iobj, 0, sizeof(iobj));
424 	if (pack_idx != -1) { /* tag is packed */
425 		iobj.idx = pack_idx;
426 		memcpy(&iobj.id, id, sizeof(iobj.id));
427 		data = &iobj;
428 		len = sizeof(iobj);
429 	} else {
430 		data = id;
431 		len = sizeof(*id);
432 	}
433 
434 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
435 	    == -1)
436 		return got_error_from_errno("imsg_compose TAG_REQUEST");
437 
438 	return flush_imsg(ibuf);
439 }
440 
441 const struct got_error *
442 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
443     struct got_object_id *id, int pack_idx)
444 {
445 	const struct got_error *err = NULL;
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) { /* blob is packed */
452 		iobj.idx = pack_idx;
453 		memcpy(&iobj.id, id, 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_BLOB_REQUEST, 0, 0, infd, data, len)
462 	    == -1) {
463 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
464 		close(infd);
465 		return err;
466 	}
467 
468 	return flush_imsg(ibuf);
469 }
470 
471 const struct got_error *
472 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
473 {
474 	const struct got_error *err = NULL;
475 
476 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
477 	    == -1) {
478 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
479 		close(outfd);
480 		return err;
481 	}
482 
483 	return flush_imsg(ibuf);
484 }
485 
486 static const struct got_error *
487 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
488 {
489 	const struct got_error *err = NULL;
490 
491 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
492 		err = got_error_from_errno("imsg_compose TMPFD");
493 		close(fd);
494 		return err;
495 	}
496 
497 	return flush_imsg(ibuf);
498 }
499 
500 const struct got_error *
501 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
502 {
503 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
504 }
505 
506 const struct got_error *
507 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
508 {
509 	struct got_imsg_object iobj;
510 
511 	memset(&iobj, 0, sizeof(iobj));
512 
513 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
514 	iobj.type = obj->type;
515 	iobj.flags = obj->flags;
516 	iobj.hdrlen = obj->hdrlen;
517 	iobj.size = obj->size;
518 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
519 		iobj.pack_offset = obj->pack_offset;
520 		iobj.pack_idx = obj->pack_idx;
521 	}
522 
523 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
524 	    == -1)
525 		return got_error_from_errno("imsg_compose OBJECT");
526 
527 	return flush_imsg(ibuf);
528 }
529 
530 const struct got_error *
531 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
532     struct got_pathlist_head *have_refs, int fetch_all_branches,
533     struct got_pathlist_head *wanted_branches,
534     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
535 {
536 	const struct got_error *err = NULL;
537 	struct ibuf *wbuf;
538 	size_t len;
539 	struct got_pathlist_entry *pe;
540 	struct got_imsg_fetch_request fetchreq;
541 
542 	memset(&fetchreq, 0, sizeof(fetchreq));
543 	fetchreq.fetch_all_branches = fetch_all_branches;
544 	fetchreq.list_refs_only = list_refs_only;
545 	fetchreq.verbosity = verbosity;
546 	TAILQ_FOREACH(pe, have_refs, entry)
547 		fetchreq.n_have_refs++;
548 	TAILQ_FOREACH(pe, wanted_branches, entry)
549 		fetchreq.n_wanted_branches++;
550 	TAILQ_FOREACH(pe, wanted_refs, entry)
551 		fetchreq.n_wanted_refs++;
552 	len = sizeof(struct got_imsg_fetch_request);
553 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
554 		close(fd);
555 		return got_error(GOT_ERR_NO_SPACE);
556 	}
557 
558 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
559 	    &fetchreq, sizeof(fetchreq)) == -1)
560 		return got_error_from_errno(
561 		    "imsg_compose FETCH_SERVER_PROGRESS");
562 
563 	err = flush_imsg(ibuf);
564 	if (err) {
565 		close(fd);
566 		return err;
567 	}
568 	fd = -1;
569 
570 	TAILQ_FOREACH(pe, have_refs, entry) {
571 		const char *name = pe->path;
572 		size_t name_len = pe->path_len;
573 		struct got_object_id *id = pe->data;
574 
575 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
576 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
577 		if (wbuf == NULL)
578 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
579 
580 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
581 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
582 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
583 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
584 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
585 		if (imsg_add(wbuf, name, name_len) == -1)
586 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
587 
588 		wbuf->fd = -1;
589 		imsg_close(ibuf, wbuf);
590 		err = flush_imsg(ibuf);
591 		if (err)
592 			return err;
593 	}
594 
595 	TAILQ_FOREACH(pe, wanted_branches, entry) {
596 		const char *name = pe->path;
597 		size_t name_len = pe->path_len;
598 
599 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
600 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
601 		    len);
602 		if (wbuf == NULL)
603 			return got_error_from_errno(
604 			    "imsg_create FETCH_WANTED_BRANCH");
605 
606 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
607 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
608 			return got_error_from_errno(
609 			    "imsg_add FETCH_WANTED_BRANCH");
610 		if (imsg_add(wbuf, name, name_len) == -1)
611 			return got_error_from_errno(
612 			    "imsg_add FETCH_WANTED_BRANCH");
613 
614 		wbuf->fd = -1;
615 		imsg_close(ibuf, wbuf);
616 		err = flush_imsg(ibuf);
617 		if (err)
618 			return err;
619 	}
620 
621 	TAILQ_FOREACH(pe, wanted_refs, entry) {
622 		const char *name = pe->path;
623 		size_t name_len = pe->path_len;
624 
625 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
626 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
627 		    len);
628 		if (wbuf == NULL)
629 			return got_error_from_errno(
630 			    "imsg_create FETCH_WANTED_REF");
631 
632 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
633 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
634 			return got_error_from_errno(
635 			    "imsg_add FETCH_WANTED_REF");
636 		if (imsg_add(wbuf, name, name_len) == -1)
637 			return got_error_from_errno(
638 			    "imsg_add FETCH_WANTED_REF");
639 
640 		wbuf->fd = -1;
641 		imsg_close(ibuf, wbuf);
642 		err = flush_imsg(ibuf);
643 		if (err)
644 			return err;
645 	}
646 
647 
648 	return NULL;
649 
650 }
651 
652 const struct got_error *
653 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
654 {
655 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
656 }
657 
658 const struct got_error *
659 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
660     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
661     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
662 {
663 	const struct got_error *err = NULL;
664 	struct imsg imsg;
665 	size_t datalen;
666 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
667 	size_t n, remain;
668 	off_t off;
669 	int i;
670 
671 	*done = 0;
672 	*id = NULL;
673 	*refname = NULL;
674 	*server_progress = NULL;
675 	*packfile_size = 0;
676 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
677 
678 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
679 	if (err)
680 		return err;
681 
682 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
683 	switch (imsg.hdr.type) {
684 	case GOT_IMSG_FETCH_SYMREFS:
685 		if (datalen < sizeof(*isymrefs)) {
686 			err = got_error(GOT_ERR_PRIVSEP_LEN);
687 			break;
688 		}
689 		if (isymrefs != NULL) {
690 			err = got_error(GOT_ERR_PRIVSEP_MSG);
691 			break;
692 		}
693 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
694 		off = sizeof(*isymrefs);
695 		remain = datalen - off;
696 		for (n = 0; n < isymrefs->nsymrefs; n++) {
697 			struct got_imsg_fetch_symref *s;
698 			char *name, *target;
699 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
700 				err = got_error(GOT_ERR_PRIVSEP_LEN);
701 				goto done;
702 			}
703 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
704 			off += sizeof(*s);
705 			remain -= sizeof(*s);
706 			if (remain < s->name_len) {
707 				err = got_error(GOT_ERR_PRIVSEP_LEN);
708 				goto done;
709 			}
710 			name = strndup(imsg.data + off, s->name_len);
711 			if (name == NULL) {
712 				err = got_error_from_errno("strndup");
713 				goto done;
714 			}
715 			off += s->name_len;
716 			remain -= s->name_len;
717 			if (remain < s->target_len) {
718 				err = got_error(GOT_ERR_PRIVSEP_LEN);
719 				free(name);
720 				goto done;
721 			}
722 			target = strndup(imsg.data + off, s->target_len);
723 			if (target == NULL) {
724 				err = got_error_from_errno("strndup");
725 				free(name);
726 				goto done;
727 			}
728 			off += s->target_len;
729 			remain -= s->target_len;
730 			err = got_pathlist_append(symrefs, name, target);
731 			if (err) {
732 				free(name);
733 				free(target);
734 				goto done;
735 			}
736 		}
737 		break;
738 	case GOT_IMSG_FETCH_REF:
739 		if (datalen <= sizeof(**id)) {
740 			err = got_error(GOT_ERR_PRIVSEP_MSG);
741 			break;
742 		}
743 		*id = malloc(sizeof(**id));
744 		if (*id == NULL) {
745 			err = got_error_from_errno("malloc");
746 			break;
747 		}
748 		memcpy(*id, imsg.data, sizeof(**id));
749 		*refname = strndup(imsg.data + sizeof(**id),
750 		    datalen - sizeof(**id));
751 		if (*refname == NULL) {
752 			err = got_error_from_errno("strndup");
753 			break;
754 		}
755 		break;
756 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
757 		if (datalen == 0) {
758 			err = got_error(GOT_ERR_PRIVSEP_LEN);
759 			break;
760 		}
761 		*server_progress = strndup(imsg.data, datalen);
762 		if (*server_progress == NULL) {
763 			err = got_error_from_errno("strndup");
764 			break;
765 		}
766 		for (i = 0; i < datalen; i++) {
767 			if (!isprint((unsigned char)(*server_progress)[i]) &&
768 			    !isspace((unsigned char)(*server_progress)[i])) {
769 				err = got_error(GOT_ERR_PRIVSEP_MSG);
770 				free(*server_progress);
771 				*server_progress = NULL;
772 				goto done;
773 			}
774 		}
775 		break;
776 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
777 		if (datalen < sizeof(*packfile_size)) {
778 			err = got_error(GOT_ERR_PRIVSEP_MSG);
779 			break;
780 		}
781 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
782 		break;
783 	case GOT_IMSG_FETCH_DONE:
784 		if (datalen != SHA1_DIGEST_LENGTH) {
785 			err = got_error(GOT_ERR_PRIVSEP_MSG);
786 			break;
787 		}
788 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
789 		*done = 1;
790 		break;
791 	default:
792 		err = got_error(GOT_ERR_PRIVSEP_MSG);
793 		break;
794 	}
795 done:
796 	if (err) {
797 		free(*id);
798 		*id = NULL;
799 		free(*refname);
800 		*refname = NULL;
801 	}
802 	imsg_free(&imsg);
803 	return err;
804 }
805 
806 static const struct got_error *
807 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
808     int delete, struct imsgbuf *ibuf)
809 {
810 	size_t len;
811 	struct ibuf *wbuf;
812 
813 	len = sizeof(struct got_imsg_send_ref) + name_len;
814 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
815 	if (wbuf == NULL)
816 		return got_error_from_errno("imsg_create SEND_REF");
817 
818 	/* Keep in sync with struct got_imsg_send_ref! */
819 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
820 		return got_error_from_errno("imsg_add SEND_REF");
821 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
822 		return got_error_from_errno("imsg_add SEND_REF");
823 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
824 		return got_error_from_errno("imsg_add SEND_REF");
825 	if (imsg_add(wbuf, name, name_len) == -1)
826 		return got_error_from_errno("imsg_add SEND_REF");
827 
828 	wbuf->fd = -1;
829 	imsg_close(ibuf, wbuf);
830 	return flush_imsg(ibuf);
831 }
832 
833 const struct got_error *
834 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
835     struct got_pathlist_head *have_refs,
836     struct got_pathlist_head *delete_refs,
837     int verbosity)
838 {
839 	const struct got_error *err = NULL;
840 	struct got_pathlist_entry *pe;
841 	struct got_imsg_send_request sendreq;
842 	struct got_object_id zero_id;
843 
844 	memset(&zero_id, 0, sizeof(zero_id));
845 	memset(&sendreq, 0, sizeof(sendreq));
846 	sendreq.verbosity = verbosity;
847 	TAILQ_FOREACH(pe, have_refs, entry)
848 		sendreq.nrefs++;
849 	TAILQ_FOREACH(pe, delete_refs, entry)
850 		sendreq.nrefs++;
851 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
852 	    &sendreq, sizeof(sendreq)) == -1) {
853 		err = got_error_from_errno(
854 		    "imsg_compose FETCH_SERVER_PROGRESS");
855 		goto done;
856 	}
857 
858 	err = flush_imsg(ibuf);
859 	if (err)
860 		goto done;
861 	fd = -1;
862 
863 	TAILQ_FOREACH(pe, have_refs, entry) {
864 		const char *name = pe->path;
865 		size_t name_len = pe->path_len;
866 		struct got_object_id *id = pe->data;
867 		err = send_send_ref(name, name_len, id, 0, ibuf);
868 		if (err)
869 			goto done;
870 	}
871 
872 	TAILQ_FOREACH(pe, delete_refs, entry) {
873 		const char *name = pe->path;
874 		size_t name_len = pe->path_len;
875 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
876 		if (err)
877 			goto done;
878 	}
879 done:
880 	if (fd != -1 && close(fd) == -1 && err == NULL)
881 		err = got_error_from_errno("close");
882 	return err;
883 
884 }
885 
886 const struct got_error *
887 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
888     struct imsgbuf *ibuf)
889 {
890 	const struct got_error *err = NULL;
891 	struct imsg imsg;
892 	size_t datalen;
893 	int done = 0;
894 	struct got_imsg_send_remote_ref iremote_ref;
895 	struct got_object_id *id = NULL;
896 	char *refname = NULL;
897 	struct got_pathlist_entry *new;
898 
899 	while (!done) {
900 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
901 		if (err)
902 			return err;
903 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
904 		switch (imsg.hdr.type) {
905 		case GOT_IMSG_SEND_REMOTE_REF:
906 			if (datalen < sizeof(iremote_ref)) {
907 				err = got_error(GOT_ERR_PRIVSEP_MSG);
908 				goto done;
909 			}
910 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
911 			if (datalen != sizeof(iremote_ref) +
912 			    iremote_ref.name_len) {
913 				err = got_error(GOT_ERR_PRIVSEP_MSG);
914 				goto done;
915 			}
916 			id = malloc(sizeof(*id));
917 			if (id == NULL) {
918 				err = got_error_from_errno("malloc");
919 				goto done;
920 			}
921 			memcpy(id, &iremote_ref.id, sizeof(*id));
922 			refname = strndup(imsg.data + sizeof(iremote_ref),
923 			    datalen - sizeof(iremote_ref));
924 			if (refname == NULL) {
925 				err = got_error_from_errno("strndup");
926 				goto done;
927 			}
928 			err = got_pathlist_insert(&new, remote_refs,
929 			    refname, id);
930 			if (err)
931 				goto done;
932 			if (new == NULL) { /* duplicate which wasn't inserted */
933 				free(id);
934 				free(refname);
935 			}
936 			id = NULL;
937 			refname = NULL;
938 			break;
939 		case GOT_IMSG_SEND_PACK_REQUEST:
940 			if (datalen != 0) {
941 				err = got_error(GOT_ERR_PRIVSEP_MSG);
942 				goto done;
943 			}
944 			/* got-send-pack is now waiting for a pack file. */
945 			done = 1;
946 			break;
947 		default:
948 			err = got_error(GOT_ERR_PRIVSEP_MSG);
949 			break;
950 		}
951 	}
952 done:
953 	free(id);
954 	free(refname);
955 	imsg_free(&imsg);
956 	return err;
957 }
958 
959 const struct got_error *
960 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
961 {
962 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
963 }
964 
965 const struct got_error *
966 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
967     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
968 {
969 	const struct got_error *err = NULL;
970 	struct imsg imsg;
971 	size_t datalen;
972 	struct got_imsg_send_ref_status iref_status;
973 
974 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
975 	*done = 0;
976 	*success = 0;
977 	*refname = NULL;
978 	*errmsg = NULL;
979 
980 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
981 	if (err)
982 		return err;
983 
984 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
985 	switch (imsg.hdr.type) {
986 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
987 		if (datalen < sizeof(*bytes_sent)) {
988 			err = got_error(GOT_ERR_PRIVSEP_MSG);
989 			break;
990 		}
991 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
992 		break;
993 	case GOT_IMSG_SEND_REF_STATUS:
994 		if (datalen < sizeof(iref_status)) {
995 			err = got_error(GOT_ERR_PRIVSEP_MSG);
996 			break;
997 		}
998 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
999 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1000 		    iref_status.errmsg_len) {
1001 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1002 			break;
1003 		}
1004 		*success = iref_status.success;
1005 		*refname = strndup(imsg.data + sizeof(iref_status),
1006 		    iref_status.name_len);
1007 
1008 		if (iref_status.errmsg_len != 0)
1009 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1010 			    iref_status.name_len, iref_status.errmsg_len);
1011 		break;
1012 	case GOT_IMSG_SEND_DONE:
1013 		if (datalen != 0) {
1014 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1015 			break;
1016 		}
1017 		*done = 1;
1018 		break;
1019 	default:
1020 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1021 		break;
1022 	}
1023 
1024 	imsg_free(&imsg);
1025 	return err;
1026 }
1027 
1028 const struct got_error *
1029 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1030     int fd)
1031 {
1032 	const struct got_error *err = NULL;
1033 
1034 	/* Keep in sync with struct got_imsg_index_pack_request */
1035 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1036 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1037 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1038 		close(fd);
1039 		return err;
1040 	}
1041 	return flush_imsg(ibuf);
1042 }
1043 
1044 const struct got_error *
1045 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1046 {
1047 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1048 }
1049 
1050 const struct got_error *
1051 got_privsep_recv_index_progress(int *done, int *nobj_total,
1052     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1053     struct imsgbuf *ibuf)
1054 {
1055 	const struct got_error *err = NULL;
1056 	struct imsg imsg;
1057 	struct got_imsg_index_pack_progress *iprogress;
1058 	size_t datalen;
1059 
1060 	*done = 0;
1061 	*nobj_total = 0;
1062 	*nobj_indexed = 0;
1063 	*nobj_resolved = 0;
1064 
1065 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1066 	if (err)
1067 		return err;
1068 
1069 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1070 	switch (imsg.hdr.type) {
1071 	case GOT_IMSG_IDXPACK_PROGRESS:
1072 		if (datalen < sizeof(*iprogress)) {
1073 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1074 			break;
1075 		}
1076 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1077 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1078 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1079 			err = got_error(GOT_ERR_RANGE);
1080 			break;
1081 		}
1082 		*nobj_total = iprogress->nobj_total;
1083 		*nobj_indexed = iprogress->nobj_indexed;
1084 		*nobj_loose = iprogress->nobj_loose;
1085 		*nobj_resolved = iprogress->nobj_resolved;
1086 		break;
1087 	case GOT_IMSG_IDXPACK_DONE:
1088 		if (datalen != 0) {
1089 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1090 			break;
1091 		}
1092 		*done = 1;
1093 		break;
1094 	default:
1095 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1096 		break;
1097 	}
1098 
1099 	imsg_free(&imsg);
1100 	return err;
1101 }
1102 
1103 const struct got_error *
1104 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1105     struct imsgbuf *ibuf)
1106 {
1107 	struct got_imsg_object *iobj;
1108 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1109 
1110 	if (datalen != sizeof(*iobj))
1111 		return got_error(GOT_ERR_PRIVSEP_LEN);
1112 	iobj = imsg->data;
1113 
1114 	if (iobj->pack_offset < 0)
1115 		return got_error(GOT_ERR_PACK_OFFSET);
1116 
1117 	*obj = calloc(1, sizeof(**obj));
1118 	if (*obj == NULL)
1119 		return got_error_from_errno("calloc");
1120 
1121 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1122 	(*obj)->type = iobj->type;
1123 	(*obj)->flags = iobj->flags;
1124 	(*obj)->hdrlen = iobj->hdrlen;
1125 	(*obj)->size = iobj->size;
1126 	/* path_packfile is handled by caller */
1127 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1128 		(*obj)->pack_offset = iobj->pack_offset;
1129 		(*obj)->pack_idx = iobj->pack_idx;
1130 	}
1131 	STAILQ_INIT(&(*obj)->deltas.entries);
1132 	return NULL;
1133 }
1134 
1135 const struct got_error *
1136 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1137 {
1138 	const struct got_error *err = NULL;
1139 	struct imsg imsg;
1140 	const size_t min_datalen =
1141 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1142 
1143 	*obj = NULL;
1144 
1145 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1146 	if (err)
1147 		return err;
1148 
1149 	switch (imsg.hdr.type) {
1150 	case GOT_IMSG_OBJECT:
1151 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1152 		break;
1153 	default:
1154 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1155 		break;
1156 	}
1157 
1158 	imsg_free(&imsg);
1159 
1160 	return err;
1161 }
1162 
1163 static const struct got_error *
1164 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1165     size_t logmsg_len)
1166 {
1167 	const struct got_error *err = NULL;
1168 	size_t offset, remain;
1169 
1170 	offset = 0;
1171 	remain = logmsg_len;
1172 	while (remain > 0) {
1173 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1174 
1175 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1176 		    commit->logmsg + offset, n) == -1) {
1177 			err = got_error_from_errno("imsg_compose "
1178 			    "COMMIT_LOGMSG");
1179 			break;
1180 		}
1181 
1182 		err = flush_imsg(ibuf);
1183 		if (err)
1184 			break;
1185 
1186 		offset += n;
1187 		remain -= n;
1188 	}
1189 
1190 	return err;
1191 }
1192 
1193 const struct got_error *
1194 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1195 {
1196 	const struct got_error *err = NULL;
1197 	struct got_imsg_commit_object *icommit;
1198 	uint8_t *buf;
1199 	size_t len, total;
1200 	struct got_object_qid *qid;
1201 	size_t author_len = strlen(commit->author);
1202 	size_t committer_len = strlen(commit->committer);
1203 	size_t logmsg_len = strlen(commit->logmsg);
1204 
1205 	total = sizeof(*icommit) + author_len + committer_len +
1206 	    commit->nparents * sizeof(struct got_object_id);
1207 
1208 	buf = malloc(total);
1209 	if (buf == NULL)
1210 		return got_error_from_errno("malloc");
1211 
1212 	icommit = (struct got_imsg_commit_object *)buf;
1213 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1214 	icommit->author_len = author_len;
1215 	icommit->author_time = commit->author_time;
1216 	icommit->author_gmtoff = commit->author_gmtoff;
1217 	icommit->committer_len = committer_len;
1218 	icommit->committer_time = commit->committer_time;
1219 	icommit->committer_gmtoff = commit->committer_gmtoff;
1220 	icommit->logmsg_len = logmsg_len;
1221 	icommit->nparents = commit->nparents;
1222 
1223 	len = sizeof(*icommit);
1224 	memcpy(buf + len, commit->author, author_len);
1225 	len += author_len;
1226 	memcpy(buf + len, commit->committer, committer_len);
1227 	len += committer_len;
1228 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1229 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1230 		len += sizeof(qid->id);
1231 	}
1232 
1233 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1234 		err = got_error_from_errno("imsg_compose COMMIT");
1235 		goto done;
1236 	}
1237 
1238 	if (logmsg_len == 0 ||
1239 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1240 		err = flush_imsg(ibuf);
1241 		if (err)
1242 			goto done;
1243 	}
1244 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1245 done:
1246 	free(buf);
1247 	return err;
1248 }
1249 
1250 static const struct got_error *
1251 get_commit_from_imsg(struct got_commit_object **commit,
1252     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1253 {
1254 	const struct got_error *err = NULL;
1255 	struct got_imsg_commit_object *icommit;
1256 	size_t len = 0;
1257 	int i;
1258 
1259 	if (datalen < sizeof(*icommit))
1260 		return got_error(GOT_ERR_PRIVSEP_LEN);
1261 
1262 	icommit = imsg->data;
1263 	if (datalen != sizeof(*icommit) + icommit->author_len +
1264 	    icommit->committer_len +
1265 	    icommit->nparents * sizeof(struct got_object_id))
1266 		return got_error(GOT_ERR_PRIVSEP_LEN);
1267 
1268 	if (icommit->nparents < 0)
1269 		return got_error(GOT_ERR_PRIVSEP_LEN);
1270 
1271 	len += sizeof(*icommit);
1272 
1273 	*commit = got_object_commit_alloc_partial();
1274 	if (*commit == NULL)
1275 		return got_error_from_errno(
1276 		    "got_object_commit_alloc_partial");
1277 
1278 	memcpy((*commit)->tree_id, &icommit->tree_id,
1279 	    sizeof(icommit->tree_id));
1280 	(*commit)->author_time = icommit->author_time;
1281 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1282 	(*commit)->committer_time = icommit->committer_time;
1283 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1284 
1285 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1286 	if ((*commit)->author == NULL) {
1287 		err = got_error_from_errno("strndup");
1288 		goto done;
1289 	}
1290 	len += icommit->author_len;
1291 
1292 	(*commit)->committer = strndup(imsg->data + len,
1293 	    icommit->committer_len);
1294 	if ((*commit)->committer == NULL) {
1295 		err = got_error_from_errno("strndup");
1296 		goto done;
1297 	}
1298 	len += icommit->committer_len;
1299 
1300 	if (icommit->logmsg_len == 0) {
1301 		(*commit)->logmsg = strdup("");
1302 		if ((*commit)->logmsg == NULL) {
1303 			err = got_error_from_errno("strdup");
1304 			goto done;
1305 		}
1306 	} else {
1307 		size_t offset = 0, remain = icommit->logmsg_len;
1308 
1309 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1310 		if ((*commit)->logmsg == NULL) {
1311 			err = got_error_from_errno("malloc");
1312 			goto done;
1313 		}
1314 		while (remain > 0) {
1315 			struct imsg imsg_log;
1316 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1317 			    remain);
1318 
1319 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1320 			if (err)
1321 				goto done;
1322 
1323 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1324 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1325 				goto done;
1326 			}
1327 
1328 			memcpy((*commit)->logmsg + offset,
1329 			    imsg_log.data, n);
1330 			imsg_free(&imsg_log);
1331 			offset += n;
1332 			remain -= n;
1333 		}
1334 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1335 	}
1336 
1337 	for (i = 0; i < icommit->nparents; i++) {
1338 		struct got_object_qid *qid;
1339 
1340 		err = got_object_qid_alloc_partial(&qid);
1341 		if (err)
1342 			break;
1343 		memcpy(&qid->id, imsg->data + len +
1344 		    i * sizeof(qid->id), sizeof(qid->id));
1345 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1346 		(*commit)->nparents++;
1347 	}
1348 done:
1349 	if (err) {
1350 		got_object_commit_close(*commit);
1351 		*commit = NULL;
1352 	}
1353 	return err;
1354 }
1355 
1356 const struct got_error *
1357 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1358 {
1359 	const struct got_error *err = NULL;
1360 	struct imsg imsg;
1361 	size_t datalen;
1362 	const size_t min_datalen =
1363 	    MIN(sizeof(struct got_imsg_error),
1364 	    sizeof(struct got_imsg_commit_object));
1365 
1366 	*commit = NULL;
1367 
1368 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1369 	if (err)
1370 		return err;
1371 
1372 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1373 
1374 	switch (imsg.hdr.type) {
1375 	case GOT_IMSG_COMMIT:
1376 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1377 		break;
1378 	default:
1379 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1380 		break;
1381 	}
1382 
1383 	imsg_free(&imsg);
1384 
1385 	return err;
1386 }
1387 
1388 static const struct got_error *
1389 send_tree_entries_batch(struct imsgbuf *ibuf,
1390     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1391 {
1392 	struct ibuf *wbuf;
1393 	struct got_imsg_tree_entries ientries;
1394 	int i;
1395 
1396 	memset(&ientries, 0, sizeof(ientries));
1397 
1398 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1399 	if (wbuf == NULL)
1400 		return got_error_from_errno("imsg_create TREE_ENTRY");
1401 
1402 	ientries.nentries = idxN - idx0 + 1;
1403 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1404 		return got_error_from_errno("imsg_add TREE_ENTRY");
1405 
1406 	for (i = idx0; i <= idxN; i++) {
1407 		struct got_parsed_tree_entry *pte = &entries[i];
1408 
1409 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1410 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1411 			return got_error_from_errno("imsg_add TREE_ENTRY");
1412 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1413 			return got_error_from_errno("imsg_add TREE_ENTRY");
1414 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1415 			return got_error_from_errno("imsg_add TREE_ENTRY");
1416 
1417 		/* Remaining bytes are the entry's name. */
1418 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1419 			return got_error_from_errno("imsg_add TREE_ENTRY");
1420 	}
1421 
1422 	wbuf->fd = -1;
1423 	imsg_close(ibuf, wbuf);
1424 	return NULL;
1425 }
1426 
1427 static const struct got_error *
1428 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1429     int nentries)
1430 {
1431 	const struct got_error *err = NULL;
1432 	int i, j;
1433 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1434 
1435 	i = 0;
1436 	for (j = 0; j < nentries; j++) {
1437 		struct got_parsed_tree_entry *pte = &entries[j];
1438 		size_t len = SHA1_DIGEST_LENGTH + sizeof(pte->mode) +
1439 		    sizeof(pte->namelen) + pte->namelen;
1440 
1441 		if (j > 0 &&
1442 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1443 			err = send_tree_entries_batch(ibuf, entries,
1444 			    i, j - 1, entries_len);
1445 			if (err)
1446 				return err;
1447 			i = j;
1448 			entries_len = sizeof(struct got_imsg_tree_entries);
1449 		}
1450 
1451 		entries_len += len;
1452 	}
1453 
1454 	if (j > 0) {
1455 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1456 		    entries_len);
1457 		if (err)
1458 			return err;
1459 	}
1460 
1461 	return NULL;
1462 }
1463 
1464 const struct got_error *
1465 got_privsep_send_tree(struct imsgbuf *ibuf,
1466     struct got_parsed_tree_entry *entries, int nentries)
1467 {
1468 	const struct got_error *err = NULL;
1469 	struct got_imsg_tree_object itree;
1470 
1471 	memset(&itree, 0, sizeof(itree));
1472 	itree.nentries = nentries;
1473 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1474 	    == -1)
1475 		return got_error_from_errno("imsg_compose TREE");
1476 
1477 	err = send_tree_entries(ibuf, entries, nentries);
1478 	if (err)
1479 		return err;
1480 
1481 	return flush_imsg(ibuf);
1482 }
1483 
1484 
1485 static const struct got_error *
1486 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1487     int *nentries)
1488 {
1489 	const struct got_error *err = NULL;
1490 	struct got_imsg_tree_entries *ientries;
1491 	struct got_tree_entry *te;
1492 	size_t te_offset;
1493 	size_t i;
1494 
1495 	if (datalen <= sizeof(*ientries) ||
1496 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1497 		return got_error(GOT_ERR_PRIVSEP_LEN);
1498 
1499 	ientries = (struct got_imsg_tree_entries *)data;
1500 	if (ientries->nentries > INT_MAX) {
1501 		return got_error_msg(GOT_ERR_NO_SPACE,
1502 		    "too many tree entries");
1503 	}
1504 
1505 	te_offset = sizeof(*ientries);
1506 	for (i = 0; i < ientries->nentries; i++) {
1507 		struct got_imsg_tree_entry ite;
1508 		const char *te_name;
1509 		uint8_t *buf = (uint8_t *)data + te_offset;
1510 
1511 		if (te_offset >= datalen) {
1512 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1513 			break;
1514 		}
1515 
1516 		/* Might not be aligned, size is ~32 bytes. */
1517 		memcpy(&ite, buf, sizeof(ite));
1518 
1519 		if (ite.namelen >= sizeof(te->name)) {
1520 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1521 			break;
1522 		}
1523 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1524 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1525 			break;
1526 		}
1527 
1528 		if (*nentries >= tree->nentries) {
1529 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1530 			break;
1531 		}
1532 		te = &tree->entries[*nentries];
1533 		te_name = buf + sizeof(ite);
1534 		memcpy(te->name, te_name, ite.namelen);
1535 		te->name[ite.namelen] = '\0';
1536 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1537 		te->mode = ite.mode;
1538 		te->idx = *nentries;
1539 		(*nentries)++;
1540 
1541 		te_offset += sizeof(ite) + ite.namelen;
1542 	}
1543 
1544 	return err;
1545 }
1546 
1547 const struct got_error *
1548 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1549 {
1550 	const struct got_error *err = NULL;
1551 	const size_t min_datalen =
1552 	    MIN(sizeof(struct got_imsg_error),
1553 	    sizeof(struct got_imsg_tree_object));
1554 	struct got_imsg_tree_object *itree;
1555 	int nentries = 0;
1556 
1557 	*tree = NULL;
1558 
1559 	while (*tree == NULL || nentries < (*tree)->nentries) {
1560 		struct imsg imsg;
1561 		size_t datalen;
1562 
1563 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1564 		if (err)
1565 			break;
1566 
1567 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1568 
1569 		switch (imsg.hdr.type) {
1570 		case GOT_IMSG_TREE:
1571 			/* This message should only appear once. */
1572 			if (*tree != NULL) {
1573 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1574 				break;
1575 			}
1576 			if (datalen != sizeof(*itree)) {
1577 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1578 				break;
1579 			}
1580 			itree = imsg.data;
1581 			if (itree->nentries < 0) {
1582 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1583 				break;
1584 			}
1585 			*tree = malloc(sizeof(**tree));
1586 			if (*tree == NULL) {
1587 				err = got_error_from_errno("malloc");
1588 				break;
1589 			}
1590 			(*tree)->entries = calloc(itree->nentries,
1591 			    sizeof(struct got_tree_entry));
1592 			if ((*tree)->entries == NULL) {
1593 				err = got_error_from_errno("malloc");
1594 				free(*tree);
1595 				*tree = NULL;
1596 				break;
1597 			}
1598 			(*tree)->nentries = itree->nentries;
1599 			(*tree)->refcnt = 0;
1600 			break;
1601 		case GOT_IMSG_TREE_ENTRIES:
1602 			/* This message should be preceeded by GOT_IMSG_TREE. */
1603 			if (*tree == NULL) {
1604 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1605 				break;
1606 			}
1607 			err = recv_tree_entries(imsg.data, datalen,
1608 			    *tree, &nentries);
1609 			break;
1610 		default:
1611 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1612 			break;
1613 		}
1614 
1615 		imsg_free(&imsg);
1616 		if (err)
1617 			break;
1618 	}
1619 
1620 	if (*tree && (*tree)->nentries != nentries) {
1621 		if (err == NULL)
1622 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1623 		got_object_tree_close(*tree);
1624 		*tree = NULL;
1625 	}
1626 
1627 	return err;
1628 }
1629 
1630 const struct got_error *
1631 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1632     const uint8_t *data)
1633 {
1634 	struct got_imsg_blob iblob;
1635 
1636 	memset(&iblob, 0, sizeof(iblob));
1637 	iblob.size = size;
1638 	iblob.hdrlen = hdrlen;
1639 
1640 	if (data) {
1641 		uint8_t *buf;
1642 
1643 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1644 			return got_error(GOT_ERR_NO_SPACE);
1645 
1646 		buf = malloc(sizeof(iblob) + size);
1647 		if (buf == NULL)
1648 			return got_error_from_errno("malloc");
1649 
1650 		memcpy(buf, &iblob, sizeof(iblob));
1651 		memcpy(buf + sizeof(iblob), data, size);
1652 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1653 		    sizeof(iblob) + size) == -1) {
1654 			free(buf);
1655 			return got_error_from_errno("imsg_compose BLOB");
1656 		}
1657 		free(buf);
1658 	} else {
1659 		/* Data has already been written to file descriptor. */
1660 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1661 		    sizeof(iblob)) == -1)
1662 			return got_error_from_errno("imsg_compose BLOB");
1663 	}
1664 
1665 
1666 	return flush_imsg(ibuf);
1667 }
1668 
1669 const struct got_error *
1670 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1671     struct imsgbuf *ibuf)
1672 {
1673 	const struct got_error *err = NULL;
1674 	struct imsg imsg;
1675 	struct got_imsg_blob *iblob;
1676 	size_t datalen;
1677 
1678 	*outbuf = NULL;
1679 
1680 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1681 	if (err)
1682 		return err;
1683 
1684 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1685 
1686 	switch (imsg.hdr.type) {
1687 	case GOT_IMSG_BLOB:
1688 		if (datalen < sizeof(*iblob)) {
1689 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1690 			break;
1691 		}
1692 		iblob = imsg.data;
1693 		*size = iblob->size;
1694 		*hdrlen = iblob->hdrlen;
1695 
1696 		if (datalen == sizeof(*iblob)) {
1697 			/* Data has been written to file descriptor. */
1698 			break;
1699 		}
1700 
1701 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1702 		    *size > datalen + sizeof(*iblob)) {
1703 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1704 			break;
1705 		}
1706 
1707 		*outbuf = malloc(*size);
1708 		if (*outbuf == NULL) {
1709 			err = got_error_from_errno("malloc");
1710 			break;
1711 		}
1712 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1713 		break;
1714 	default:
1715 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1716 		break;
1717 	}
1718 
1719 	imsg_free(&imsg);
1720 
1721 	return err;
1722 }
1723 
1724 static const struct got_error *
1725 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1726 {
1727 	const struct got_error *err = NULL;
1728 	size_t offset, remain;
1729 
1730 	offset = 0;
1731 	remain = tagmsg_len;
1732 	while (remain > 0) {
1733 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1734 
1735 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1736 		    tag->tagmsg + offset, n) == -1) {
1737 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1738 			break;
1739 		}
1740 
1741 		err = flush_imsg(ibuf);
1742 		if (err)
1743 			break;
1744 
1745 		offset += n;
1746 		remain -= n;
1747 	}
1748 
1749 	return err;
1750 }
1751 
1752 const struct got_error *
1753 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1754 {
1755 	const struct got_error *err = NULL;
1756 	struct got_imsg_tag_object *itag;
1757 	uint8_t *buf;
1758 	size_t len, total;
1759 	size_t tag_len = strlen(tag->tag);
1760 	size_t tagger_len = strlen(tag->tagger);
1761 	size_t tagmsg_len = strlen(tag->tagmsg);
1762 
1763 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1764 
1765 	buf = malloc(total);
1766 	if (buf == NULL)
1767 		return got_error_from_errno("malloc");
1768 
1769 	itag = (struct got_imsg_tag_object *)buf;
1770 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1771 	itag->obj_type = tag->obj_type;
1772 	itag->tag_len = tag_len;
1773 	itag->tagger_len = tagger_len;
1774 	itag->tagger_time = tag->tagger_time;
1775 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1776 	itag->tagmsg_len = tagmsg_len;
1777 
1778 	len = sizeof(*itag);
1779 	memcpy(buf + len, tag->tag, tag_len);
1780 	len += tag_len;
1781 	memcpy(buf + len, tag->tagger, tagger_len);
1782 	len += tagger_len;
1783 
1784 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1785 		err = got_error_from_errno("imsg_compose TAG");
1786 		goto done;
1787 	}
1788 
1789 	if (tagmsg_len == 0 ||
1790 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1791 		err = flush_imsg(ibuf);
1792 		if (err)
1793 			goto done;
1794 	}
1795 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1796 done:
1797 	free(buf);
1798 	return err;
1799 }
1800 
1801 const struct got_error *
1802 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1803 {
1804 	const struct got_error *err = NULL;
1805 	struct imsg imsg;
1806 	struct got_imsg_tag_object *itag;
1807 	size_t len, datalen;
1808 	const size_t min_datalen =
1809 	    MIN(sizeof(struct got_imsg_error),
1810 	    sizeof(struct got_imsg_tag_object));
1811 
1812 	*tag = NULL;
1813 
1814 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1815 	if (err)
1816 		return err;
1817 
1818 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1819 	len = 0;
1820 
1821 	switch (imsg.hdr.type) {
1822 	case GOT_IMSG_TAG:
1823 		if (datalen < sizeof(*itag)) {
1824 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1825 			break;
1826 		}
1827 		itag = imsg.data;
1828 		if (datalen != sizeof(*itag) + itag->tag_len +
1829 		    itag->tagger_len) {
1830 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1831 			break;
1832 		}
1833 		len += sizeof(*itag);
1834 
1835 		*tag = calloc(1, sizeof(**tag));
1836 		if (*tag == NULL) {
1837 			err = got_error_from_errno("calloc");
1838 			break;
1839 		}
1840 
1841 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1842 
1843 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1844 		if ((*tag)->tag == NULL) {
1845 			err = got_error_from_errno("strndup");
1846 			break;
1847 		}
1848 		len += itag->tag_len;
1849 
1850 		(*tag)->obj_type = itag->obj_type;
1851 		(*tag)->tagger_time = itag->tagger_time;
1852 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1853 
1854 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1855 		if ((*tag)->tagger == NULL) {
1856 			err = got_error_from_errno("strndup");
1857 			break;
1858 		}
1859 		len += itag->tagger_len;
1860 
1861 		if (itag->tagmsg_len == 0) {
1862 			(*tag)->tagmsg = strdup("");
1863 			if ((*tag)->tagmsg == NULL) {
1864 				err = got_error_from_errno("strdup");
1865 				break;
1866 			}
1867 		} else {
1868 			size_t offset = 0, remain = itag->tagmsg_len;
1869 
1870 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1871 			if ((*tag)->tagmsg == NULL) {
1872 				err = got_error_from_errno("malloc");
1873 				break;
1874 			}
1875 			while (remain > 0) {
1876 				struct imsg imsg_log;
1877 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1878 				    remain);
1879 
1880 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1881 				if (err)
1882 					return err;
1883 
1884 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1885 					return got_error(GOT_ERR_PRIVSEP_MSG);
1886 
1887 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1888 				    n);
1889 				imsg_free(&imsg_log);
1890 				offset += n;
1891 				remain -= n;
1892 			}
1893 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1894 		}
1895 
1896 		break;
1897 	default:
1898 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1899 		break;
1900 	}
1901 
1902 	imsg_free(&imsg);
1903 
1904 	return err;
1905 }
1906 
1907 const struct got_error *
1908 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1909     struct got_packidx *packidx)
1910 {
1911 	const struct got_error *err = NULL;
1912 	struct got_imsg_packidx ipackidx;
1913 	struct got_imsg_pack ipack;
1914 	int fd;
1915 
1916 	memset(&ipackidx, 0, sizeof(ipackidx));
1917 	memset(&ipack, 0, sizeof(ipack));
1918 
1919 	ipackidx.len = packidx->len;
1920 	ipackidx.packfile_size = pack->filesize;
1921 	fd = dup(packidx->fd);
1922 	if (fd == -1)
1923 		return got_error_from_errno("dup");
1924 
1925 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1926 	    sizeof(ipackidx)) == -1) {
1927 		err = got_error_from_errno("imsg_compose PACKIDX");
1928 		close(fd);
1929 		return err;
1930 	}
1931 
1932 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1933 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1934 		return got_error(GOT_ERR_NO_SPACE);
1935 	ipack.filesize = pack->filesize;
1936 
1937 	fd = dup(pack->fd);
1938 	if (fd == -1)
1939 		return got_error_from_errno("dup");
1940 
1941 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1942 	    == -1) {
1943 		err = got_error_from_errno("imsg_compose PACK");
1944 		close(fd);
1945 		return err;
1946 	}
1947 
1948 	return flush_imsg(ibuf);
1949 }
1950 
1951 const struct got_error *
1952 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1953     struct got_object_id *id)
1954 {
1955 	struct got_imsg_packed_object iobj;
1956 
1957 	memset(&iobj, 0, sizeof(iobj));
1958 	iobj.idx = idx;
1959 	memcpy(&iobj.id, id, sizeof(iobj.id));
1960 
1961 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1962 	    &iobj, sizeof(iobj)) == -1)
1963 		return got_error_from_errno("imsg_compose "
1964 		    "PACKED_OBJECT_REQUEST");
1965 
1966 	return flush_imsg(ibuf);
1967 }
1968 
1969 const struct got_error *
1970 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1971     struct got_object_id *id)
1972 {
1973 	struct got_imsg_packed_object iobj;
1974 
1975 	memset(&iobj, 0, sizeof(iobj));
1976 	iobj.idx = idx;
1977 	memcpy(&iobj.id, id, sizeof(iobj.id));
1978 
1979 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
1980 	    &iobj, sizeof(iobj)) == -1)
1981 		return got_error_from_errno("imsg_compose "
1982 		    "PACKED_OBJECT_REQUEST");
1983 
1984 	return flush_imsg(ibuf);
1985 }
1986 
1987 const struct got_error *
1988 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1989 {
1990 	const struct got_error *err = NULL;
1991 
1992 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1993 	    NULL, 0) == -1) {
1994 		err = got_error_from_errno("imsg_compose "
1995 		    "GITCONFIG_PARSE_REQUEST");
1996 		close(fd);
1997 		return err;
1998 	}
1999 
2000 	return flush_imsg(ibuf);
2001 }
2002 
2003 const struct got_error *
2004 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2005 {
2006 	if (imsg_compose(ibuf,
2007 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2008 	    NULL, 0) == -1)
2009 		return got_error_from_errno("imsg_compose "
2010 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2011 
2012 	return flush_imsg(ibuf);
2013 }
2014 
2015 const struct got_error *
2016 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2017 {
2018 	if (imsg_compose(ibuf,
2019 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2020 	    NULL, 0) == -1)
2021 		return got_error_from_errno("imsg_compose "
2022 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2023 
2024 	return flush_imsg(ibuf);
2025 }
2026 
2027 
2028 const struct got_error *
2029 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2030 {
2031 	if (imsg_compose(ibuf,
2032 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2033 		return got_error_from_errno("imsg_compose "
2034 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2035 
2036 	return flush_imsg(ibuf);
2037 }
2038 
2039 const struct got_error *
2040 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2041 {
2042 	if (imsg_compose(ibuf,
2043 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2044 		return got_error_from_errno("imsg_compose "
2045 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2046 
2047 	return flush_imsg(ibuf);
2048 }
2049 
2050 const struct got_error *
2051 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2052 {
2053 	if (imsg_compose(ibuf,
2054 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2055 		return got_error_from_errno("imsg_compose "
2056 		    "GITCONFIG_REMOTE_REQUEST");
2057 
2058 	return flush_imsg(ibuf);
2059 }
2060 
2061 const struct got_error *
2062 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2063 {
2064 	if (imsg_compose(ibuf,
2065 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2066 		return got_error_from_errno("imsg_compose "
2067 		    "GITCONFIG_OWNER_REQUEST");
2068 
2069 	return flush_imsg(ibuf);
2070 }
2071 
2072 const struct got_error *
2073 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2074 {
2075 	const struct got_error *err = NULL;
2076 	struct imsg imsg;
2077 	size_t datalen;
2078 
2079 	*str = NULL;
2080 
2081 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2082 	if (err)
2083 		return err;
2084 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2085 
2086 	switch (imsg.hdr.type) {
2087 	case GOT_IMSG_GITCONFIG_STR_VAL:
2088 		if (datalen == 0)
2089 			break;
2090 		*str = strndup(imsg.data, datalen);
2091 		if (*str == NULL) {
2092 			err = got_error_from_errno("strndup");
2093 			break;
2094 		}
2095 		break;
2096 	default:
2097 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2098 		break;
2099 	}
2100 
2101 	imsg_free(&imsg);
2102 	return err;
2103 }
2104 
2105 const struct got_error *
2106 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2107 {
2108 	const struct got_error *err = NULL;
2109 	struct got_imsg_gitconfig_pair p;
2110 	struct imsg imsg;
2111 	size_t datalen;
2112 	uint8_t *data;
2113 
2114 	*key = *val = NULL;
2115 
2116 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2117 	if (err)
2118 		return err;
2119 
2120 	data = imsg.data;
2121 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2122 
2123 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2124 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2125 		goto done;
2126 	}
2127 
2128 	if (datalen < sizeof(p)) {
2129 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2130 		goto done;
2131 	}
2132 
2133 	memcpy(&p, data, sizeof(p));
2134 	data += sizeof(p);
2135 
2136 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2137 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2138 		goto done;
2139 	}
2140 
2141 	*key = strndup(data, p.klen);
2142 	if (*key == NULL) {
2143 		err = got_error_from_errno("strndup");
2144 		goto done;
2145 	}
2146 	data += p.klen;
2147 
2148 	*val = strndup(data, p.vlen);
2149 	if (*val == NULL) {
2150 		err = got_error_from_errno("strndup");
2151 		goto done;
2152 	}
2153 
2154 done:
2155 	imsg_free(&imsg);
2156 	return err;
2157 }
2158 
2159 const struct got_error *
2160 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2161 {
2162 	const struct got_error *err = NULL;
2163 	struct imsg imsg;
2164 	size_t datalen;
2165 	const size_t min_datalen =
2166 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2167 
2168 	*val = 0;
2169 
2170 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2171 	if (err)
2172 		return err;
2173 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2174 
2175 	switch (imsg.hdr.type) {
2176 	case GOT_IMSG_GITCONFIG_INT_VAL:
2177 		if (datalen != sizeof(*val)) {
2178 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2179 			break;
2180 		}
2181 		memcpy(val, imsg.data, sizeof(*val));
2182 		break;
2183 	default:
2184 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2185 		break;
2186 	}
2187 
2188 	imsg_free(&imsg);
2189 	return err;
2190 }
2191 
2192 static void
2193 free_remote_data(struct got_remote_repo *remote)
2194 {
2195 	int i;
2196 
2197 	free(remote->name);
2198 	free(remote->fetch_url);
2199 	free(remote->send_url);
2200 	for (i = 0; i < remote->nfetch_branches; i++)
2201 		free(remote->fetch_branches[i]);
2202 	free(remote->fetch_branches);
2203 	for (i = 0; i < remote->nsend_branches; i++)
2204 		free(remote->send_branches[i]);
2205 	free(remote->send_branches);
2206 	for (i = 0; i < remote->nfetch_refs; i++)
2207 		free(remote->fetch_refs[i]);
2208 	free(remote->fetch_refs);
2209 }
2210 
2211 const struct got_error *
2212 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2213     int *nremotes, struct imsgbuf *ibuf)
2214 {
2215 	const struct got_error *err = NULL;
2216 	struct imsg imsg;
2217 	size_t datalen;
2218 	struct got_imsg_remotes iremotes;
2219 	struct got_imsg_remote iremote;
2220 
2221 	*remotes = NULL;
2222 	*nremotes = 0;
2223 	iremotes.nremotes = 0;
2224 
2225 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2226 	if (err)
2227 		return err;
2228 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2229 
2230 	switch (imsg.hdr.type) {
2231 	case GOT_IMSG_GITCONFIG_REMOTES:
2232 		if (datalen != sizeof(iremotes)) {
2233 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2234 			break;
2235 		}
2236 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2237 		if (iremotes.nremotes == 0) {
2238 			imsg_free(&imsg);
2239 			return NULL;
2240 		}
2241 		break;
2242 	default:
2243 		imsg_free(&imsg);
2244 		return got_error(GOT_ERR_PRIVSEP_MSG);
2245 	}
2246 
2247 	imsg_free(&imsg);
2248 
2249 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2250 	if (*remotes == NULL)
2251 		return got_error_from_errno("recallocarray");
2252 
2253 	while (*nremotes < iremotes.nremotes) {
2254 		struct got_remote_repo *remote;
2255 
2256 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2257 		if (err)
2258 			break;
2259 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2260 
2261 		switch (imsg.hdr.type) {
2262 		case GOT_IMSG_GITCONFIG_REMOTE:
2263 			remote = &(*remotes)[*nremotes];
2264 			memset(remote, 0, sizeof(*remote));
2265 			if (datalen < sizeof(iremote)) {
2266 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2267 				break;
2268 			}
2269 			memcpy(&iremote, imsg.data, sizeof(iremote));
2270 			if (iremote.name_len == 0 ||
2271 			    iremote.fetch_url_len == 0 ||
2272 			    iremote.send_url_len == 0 ||
2273 			    (sizeof(iremote) + iremote.name_len +
2274 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2275 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2276 				break;
2277 			}
2278 			remote->name = strndup(imsg.data + sizeof(iremote),
2279 			    iremote.name_len);
2280 			if (remote->name == NULL) {
2281 				err = got_error_from_errno("strndup");
2282 				break;
2283 			}
2284 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2285 			    iremote.name_len, iremote.fetch_url_len);
2286 			if (remote->fetch_url == NULL) {
2287 				err = got_error_from_errno("strndup");
2288 				free_remote_data(remote);
2289 				break;
2290 			}
2291 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2292 			    iremote.name_len + iremote.fetch_url_len,
2293 			    iremote.send_url_len);
2294 			if (remote->send_url == NULL) {
2295 				err = got_error_from_errno("strndup");
2296 				free_remote_data(remote);
2297 				break;
2298 			}
2299 			remote->mirror_references = iremote.mirror_references;
2300 			remote->fetch_all_branches = iremote.fetch_all_branches;
2301 			remote->nfetch_branches = 0;
2302 			remote->fetch_branches = NULL;
2303 			remote->nsend_branches = 0;
2304 			remote->send_branches = NULL;
2305 			remote->nfetch_refs = 0;
2306 			remote->fetch_refs = NULL;
2307 			(*nremotes)++;
2308 			break;
2309 		default:
2310 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2311 			break;
2312 		}
2313 
2314 		imsg_free(&imsg);
2315 		if (err)
2316 			break;
2317 	}
2318 
2319 	if (err) {
2320 		int i;
2321 		for (i = 0; i < *nremotes; i++)
2322 			free_remote_data(&(*remotes)[i]);
2323 		free(*remotes);
2324 		*remotes = NULL;
2325 		*nremotes = 0;
2326 	}
2327 	return err;
2328 }
2329 
2330 const struct got_error *
2331 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2332 {
2333 	const struct got_error *err = NULL;
2334 
2335 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2336 	    NULL, 0) == -1) {
2337 		err = got_error_from_errno("imsg_compose "
2338 		    "GOTCONFIG_PARSE_REQUEST");
2339 		close(fd);
2340 		return err;
2341 	}
2342 
2343 	return flush_imsg(ibuf);
2344 }
2345 
2346 const struct got_error *
2347 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2348 {
2349 	if (imsg_compose(ibuf,
2350 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2351 		return got_error_from_errno("imsg_compose "
2352 		    "GOTCONFIG_AUTHOR_REQUEST");
2353 
2354 	return flush_imsg(ibuf);
2355 }
2356 
2357 const struct got_error *
2358 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2359 {
2360 	if (imsg_compose(ibuf,
2361 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2362 		return got_error_from_errno("imsg_compose "
2363 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2364 
2365 	return flush_imsg(ibuf);
2366 }
2367 
2368 const struct got_error *
2369 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2370 {
2371 	if (imsg_compose(ibuf,
2372 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2373 		return got_error_from_errno("imsg_compose "
2374 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2375 
2376 	return flush_imsg(ibuf);
2377 }
2378 
2379 const struct got_error *
2380 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2381 {
2382 	if (imsg_compose(ibuf,
2383 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2384 		return got_error_from_errno("imsg_compose "
2385 		    "GOTCONFIG_SIGNERID_REQUEST");
2386 
2387 	return flush_imsg(ibuf);
2388 }
2389 
2390 const struct got_error *
2391 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2392 {
2393 	if (imsg_compose(ibuf,
2394 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2395 		return got_error_from_errno("imsg_compose "
2396 		    "GOTCONFIG_REMOTE_REQUEST");
2397 
2398 	return flush_imsg(ibuf);
2399 }
2400 
2401 const struct got_error *
2402 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2403 {
2404 	const struct got_error *err = NULL;
2405 	struct imsg imsg;
2406 	size_t datalen;
2407 
2408 	*str = NULL;
2409 
2410 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2411 	if (err)
2412 		return err;
2413 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2414 
2415 	switch (imsg.hdr.type) {
2416 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2417 		if (datalen == 0)
2418 			break;
2419 		*str = strndup(imsg.data, datalen);
2420 		if (*str == NULL) {
2421 			err = got_error_from_errno("strndup");
2422 			break;
2423 		}
2424 		break;
2425 	default:
2426 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2427 		break;
2428 	}
2429 
2430 	imsg_free(&imsg);
2431 	return err;
2432 }
2433 
2434 const struct got_error *
2435 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2436     int *nremotes, struct imsgbuf *ibuf)
2437 {
2438 	const struct got_error *err = NULL;
2439 	struct imsg imsg;
2440 	size_t datalen;
2441 	struct got_imsg_remotes iremotes;
2442 	struct got_imsg_remote iremote;
2443 	const size_t min_datalen =
2444 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2445 
2446 	*remotes = NULL;
2447 	*nremotes = 0;
2448 	iremotes.nremotes = 0;
2449 
2450 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2451 	if (err)
2452 		return err;
2453 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2454 
2455 	switch (imsg.hdr.type) {
2456 	case GOT_IMSG_GOTCONFIG_REMOTES:
2457 		if (datalen != sizeof(iremotes)) {
2458 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2459 			break;
2460 		}
2461 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2462 		if (iremotes.nremotes < 0) {
2463 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2464 			break;
2465 		}
2466 		if (iremotes.nremotes == 0) {
2467 			imsg_free(&imsg);
2468 			return NULL;
2469 		}
2470 		break;
2471 	default:
2472 		imsg_free(&imsg);
2473 		return got_error(GOT_ERR_PRIVSEP_MSG);
2474 	}
2475 
2476 	imsg_free(&imsg);
2477 
2478 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2479 	if (*remotes == NULL)
2480 		return got_error_from_errno("recallocarray");
2481 
2482 	while (*nremotes < iremotes.nremotes) {
2483 		struct got_remote_repo *remote;
2484 		const size_t min_datalen =
2485 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2486 		int i;
2487 
2488 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2489 		if (err)
2490 			break;
2491 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2492 
2493 		switch (imsg.hdr.type) {
2494 		case GOT_IMSG_GOTCONFIG_REMOTE:
2495 			remote = &(*remotes)[*nremotes];
2496 			memset(remote, 0, sizeof(*remote));
2497 			if (datalen < sizeof(iremote)) {
2498 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2499 				break;
2500 			}
2501 			memcpy(&iremote, imsg.data, sizeof(iremote));
2502 			if (iremote.name_len == 0 ||
2503 			    (iremote.fetch_url_len == 0 &&
2504 			    iremote.send_url_len == 0) ||
2505 			    (sizeof(iremote) + iremote.name_len +
2506 			    iremote.fetch_url_len + iremote.send_url_len) >
2507 			    datalen) {
2508 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2509 				break;
2510 			}
2511 			remote->name = strndup(imsg.data + sizeof(iremote),
2512 			    iremote.name_len);
2513 			if (remote->name == NULL) {
2514 				err = got_error_from_errno("strndup");
2515 				break;
2516 			}
2517 			remote->fetch_url = strndup(imsg.data +
2518 			    sizeof(iremote) + iremote.name_len,
2519 			    iremote.fetch_url_len);
2520 			if (remote->fetch_url == NULL) {
2521 				err = got_error_from_errno("strndup");
2522 				free_remote_data(remote);
2523 				break;
2524 			}
2525 			remote->send_url = strndup(imsg.data +
2526 			    sizeof(iremote) + iremote.name_len +
2527 			    iremote.fetch_url_len, iremote.send_url_len);
2528 			if (remote->send_url == NULL) {
2529 				err = got_error_from_errno("strndup");
2530 				free_remote_data(remote);
2531 				break;
2532 			}
2533 			remote->mirror_references = iremote.mirror_references;
2534 			remote->fetch_all_branches = iremote.fetch_all_branches;
2535 			if (iremote.nfetch_branches > 0) {
2536 				remote->fetch_branches = recallocarray(NULL, 0,
2537 				    iremote.nfetch_branches, sizeof(char *));
2538 				if (remote->fetch_branches == NULL) {
2539 					err = got_error_from_errno("calloc");
2540 					free_remote_data(remote);
2541 					break;
2542 				}
2543 			}
2544 			remote->nfetch_branches = 0;
2545 			for (i = 0; i < iremote.nfetch_branches; i++) {
2546 				char *branch;
2547 				err = got_privsep_recv_gotconfig_str(&branch,
2548 				    ibuf);
2549 				if (err) {
2550 					free_remote_data(remote);
2551 					goto done;
2552 				}
2553 				remote->fetch_branches[i] = branch;
2554 				remote->nfetch_branches++;
2555 			}
2556 			if (iremote.nsend_branches > 0) {
2557 				remote->send_branches = recallocarray(NULL, 0,
2558 				    iremote.nsend_branches, sizeof(char *));
2559 				if (remote->send_branches == NULL) {
2560 					err = got_error_from_errno("calloc");
2561 					free_remote_data(remote);
2562 					break;
2563 				}
2564 			}
2565 			remote->nsend_branches = 0;
2566 			for (i = 0; i < iremote.nsend_branches; i++) {
2567 				char *branch;
2568 				err = got_privsep_recv_gotconfig_str(&branch,
2569 				    ibuf);
2570 				if (err) {
2571 					free_remote_data(remote);
2572 					goto done;
2573 				}
2574 				remote->send_branches[i] = branch;
2575 				remote->nsend_branches++;
2576 			}
2577 			if (iremote.nfetch_refs > 0) {
2578 				remote->fetch_refs = recallocarray(NULL, 0,
2579 				    iremote.nfetch_refs, sizeof(char *));
2580 				if (remote->fetch_refs == NULL) {
2581 					err = got_error_from_errno("calloc");
2582 					free_remote_data(remote);
2583 					break;
2584 				}
2585 			}
2586 			remote->nfetch_refs = 0;
2587 			for (i = 0; i < iremote.nfetch_refs; i++) {
2588 				char *ref;
2589 				err = got_privsep_recv_gotconfig_str(&ref,
2590 				    ibuf);
2591 				if (err) {
2592 					free_remote_data(remote);
2593 					goto done;
2594 				}
2595 				remote->fetch_refs[i] = ref;
2596 				remote->nfetch_refs++;
2597 			}
2598 			(*nremotes)++;
2599 			break;
2600 		default:
2601 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2602 			break;
2603 		}
2604 
2605 		imsg_free(&imsg);
2606 		if (err)
2607 			break;
2608 	}
2609 done:
2610 	if (err) {
2611 		int i;
2612 		for (i = 0; i < *nremotes; i++)
2613 			free_remote_data(&(*remotes)[i]);
2614 		free(*remotes);
2615 		*remotes = NULL;
2616 		*nremotes = 0;
2617 	}
2618 	return err;
2619 }
2620 
2621 const struct got_error *
2622 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2623     struct got_object_id *id, int idx, const char *path)
2624 {
2625 	struct ibuf *wbuf;
2626 	size_t path_len = strlen(path) + 1;
2627 
2628 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2629 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2630 	if (wbuf == NULL)
2631 		return got_error_from_errno(
2632 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2633 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2634 		return got_error_from_errno("imsg_add "
2635 		    "COMMIT_TRAVERSAL_REQUEST");
2636 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2637 		return got_error_from_errno("imsg_add "
2638 		    "COMMIT_TRAVERSAL_REQUEST");
2639 	if (imsg_add(wbuf, path, path_len) == -1)
2640 		return got_error_from_errno("imsg_add "
2641 		    "COMMIT_TRAVERSAL_REQUEST");
2642 
2643 	wbuf->fd = -1;
2644 	imsg_close(ibuf, wbuf);
2645 
2646 	return flush_imsg(ibuf);
2647 }
2648 
2649 const struct got_error *
2650 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2651     struct got_object_id **changed_commit_id,
2652     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2653 {
2654 	const struct got_error *err = NULL;
2655 	struct imsg imsg;
2656 	struct got_imsg_traversed_commits *icommits;
2657 	size_t datalen;
2658 	int i, done = 0;
2659 
2660 	*changed_commit = NULL;
2661 	*changed_commit_id = NULL;
2662 
2663 	while (!done) {
2664 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2665 		if (err)
2666 			return err;
2667 
2668 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2669 		switch (imsg.hdr.type) {
2670 		case GOT_IMSG_TRAVERSED_COMMITS:
2671 			icommits = imsg.data;
2672 			if (datalen != sizeof(*icommits) +
2673 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2674 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2675 				break;
2676 			}
2677 			for (i = 0; i < icommits->ncommits; i++) {
2678 				struct got_object_qid *qid;
2679 				uint8_t *sha1 = (uint8_t *)imsg.data +
2680 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2681 				err = got_object_qid_alloc_partial(&qid);
2682 				if (err)
2683 					break;
2684 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2685 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2686 
2687 				/* The last commit may contain a change. */
2688 				if (i == icommits->ncommits - 1) {
2689 					*changed_commit_id =
2690 					    got_object_id_dup(&qid->id);
2691 					if (*changed_commit_id == NULL) {
2692 						err = got_error_from_errno(
2693 						    "got_object_id_dup");
2694 						break;
2695 					}
2696 				}
2697 			}
2698 			break;
2699 		case GOT_IMSG_COMMIT:
2700 			if (*changed_commit_id == NULL) {
2701 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2702 				break;
2703 			}
2704 			err = get_commit_from_imsg(changed_commit, &imsg,
2705 			    datalen, ibuf);
2706 			break;
2707 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2708 			done = 1;
2709 			break;
2710 		default:
2711 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2712 			break;
2713 		}
2714 
2715 		imsg_free(&imsg);
2716 		if (err)
2717 			break;
2718 	}
2719 
2720 	if (err)
2721 		got_object_id_queue_free(commit_ids);
2722 	return err;
2723 }
2724 
2725 const struct got_error *
2726 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2727     struct got_object_id *tree_id, const char *path,
2728     struct got_parsed_tree_entry *entries, int nentries)
2729 {
2730 	const struct got_error *err = NULL;
2731 	struct ibuf *wbuf;
2732 	size_t path_len = strlen(path);
2733 	size_t msglen;
2734 
2735 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2736 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2737 	if (wbuf == NULL)
2738 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2739 
2740 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2741 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2742 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2743 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2744 	if (imsg_add(wbuf, path, path_len) == -1)
2745 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2746 
2747 	wbuf->fd = -1;
2748 	imsg_close(ibuf, wbuf);
2749 
2750 	if (entries) {
2751 		err = send_tree_entries(ibuf, entries, nentries);
2752 		if (err)
2753 			return err;
2754 	}
2755 
2756 	return flush_imsg(ibuf);
2757 }
2758 
2759 const struct got_error *
2760 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2761 {
2762 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2763 	    0, 0, -1, NULL, 0) == -1)
2764 		return got_error_from_errno("imsg_compose "
2765 		    "OBJECT_ENUMERATION_REQUEST");
2766 
2767 	return flush_imsg(ibuf);
2768 }
2769 
2770 const struct got_error *
2771 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2772 {
2773 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2774 	    0, 0, -1, NULL, 0) == -1)
2775 		return got_error_from_errno("imsg_compose "
2776 		    "OBJECT_ENUMERATION_DONE");
2777 
2778 	return flush_imsg(ibuf);
2779 }
2780 
2781 const struct got_error *
2782 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2783 {
2784 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2785 	    0, 0, -1, NULL, 0) == -1)
2786 		return got_error_from_errno("imsg_compose "
2787 		    "OBJECT_ENUMERATION_INCOMPLETE");
2788 
2789 	return flush_imsg(ibuf);
2790 }
2791 
2792 const struct got_error *
2793 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2794     struct got_object_id *id, time_t mtime)
2795 {
2796 	struct ibuf *wbuf;
2797 
2798 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2799 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2800 	if (wbuf == NULL)
2801 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2802 
2803 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2804 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2805 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2806 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2807 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2808 
2809 	wbuf->fd = -1;
2810 	imsg_close(ibuf, wbuf);
2811 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2812 	return NULL;
2813 }
2814 
2815 const struct got_error *
2816 got_privsep_recv_enumerated_objects(int *found_all_objects,
2817     struct imsgbuf *ibuf,
2818     got_object_enumerate_commit_cb cb_commit,
2819     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2820     struct got_repository *repo)
2821 {
2822 	const struct got_error *err = NULL;
2823 	struct imsg imsg;
2824 	struct got_imsg_enumerated_commit *icommit = NULL;
2825 	struct got_object_id commit_id;
2826 	int have_commit = 0;
2827 	time_t mtime = 0;
2828 	struct got_tree_object tree;
2829 	struct got_imsg_enumerated_tree *itree;
2830 	struct got_object_id tree_id;
2831 	char *path = NULL, *canon_path = NULL;
2832 	size_t datalen, path_len;
2833 	int nentries = -1;
2834 	int done = 0;
2835 
2836 	*found_all_objects = 0;
2837 	memset(&tree, 0, sizeof(tree));
2838 
2839 	while (!done) {
2840 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2841 		if (err)
2842 			break;
2843 
2844 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2845 		switch (imsg.hdr.type) {
2846 		case GOT_IMSG_ENUMERATED_COMMIT:
2847 			if (have_commit && nentries != -1) {
2848 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2849 				break;
2850 			}
2851 			if (datalen != sizeof(*icommit)) {
2852 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2853 				break;
2854 			}
2855 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2856 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2857 			mtime = icommit->mtime;
2858 			have_commit = 1;
2859 			break;
2860 		case GOT_IMSG_ENUMERATED_TREE:
2861 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2862 			if (!have_commit) {
2863 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2864 				break;
2865 			}
2866 			if (datalen < sizeof(*itree)) {
2867 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2868 				break;
2869 			}
2870 			itree = imsg.data;
2871 			path_len = datalen - sizeof(*itree);
2872 			if (path_len == 0) {
2873 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2874 				break;
2875 			}
2876 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2877 			free(path);
2878 			path = strndup(imsg.data + sizeof(*itree), path_len);
2879 			if (path == NULL) {
2880 				err = got_error_from_errno("strndup");
2881 				break;
2882 			}
2883 			free(canon_path);
2884 			canon_path = malloc(path_len + 1);
2885 			if (canon_path == NULL) {
2886 				err = got_error_from_errno("malloc");
2887 				break;
2888 			}
2889 			if (!got_path_is_absolute(path)) {
2890 				err = got_error(GOT_ERR_BAD_PATH);
2891 				break;
2892 			}
2893 			if (got_path_is_root_dir(path)) {
2894 				/* XXX check what got_canonpath() does wrong */
2895 				canon_path[0] = '/';
2896 				canon_path[1] = '\0';
2897 			} else {
2898 				err = got_canonpath(path, canon_path,
2899 				    path_len + 1);
2900 				if (err)
2901 					break;
2902 			}
2903 			if (strcmp(path, canon_path) != 0) {
2904 				err = got_error(GOT_ERR_BAD_PATH);
2905 				break;
2906 			}
2907 			if (nentries != -1) {
2908 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2909 				break;
2910 			}
2911 			if (itree->nentries < -1) {
2912 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2913 				break;
2914 			}
2915 			if (itree->nentries == -1) {
2916 				/* Tree was not found in pack file. */
2917 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2918 				    path, repo);
2919 				break;
2920 			}
2921 			if (itree->nentries > INT_MAX) {
2922 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2923 				break;
2924 			}
2925 			tree.entries = calloc(itree->nentries,
2926 			    sizeof(struct got_tree_entry));
2927 			if (tree.entries == NULL) {
2928 				err = got_error_from_errno("calloc");
2929 				break;
2930 			}
2931 			if (itree->nentries == 0) {
2932 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2933 				    path, repo);
2934 				if (err)
2935 					break;
2936 
2937 				/* Prepare for next tree. */
2938 				free(tree.entries);
2939 				memset(&tree, 0, sizeof(tree));
2940 				nentries = -1;
2941 			} else {
2942 				tree.nentries = itree->nentries;
2943 				nentries = 0;
2944 			}
2945 			break;
2946 		case GOT_IMSG_TREE_ENTRIES:
2947 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2948 			if (nentries <= -1) {
2949 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2950 				break;
2951 			}
2952 			err = recv_tree_entries(imsg.data, datalen,
2953 			    &tree, &nentries);
2954 			if (err)
2955 				break;
2956 			if (tree.nentries == nentries) {
2957 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2958 				    path, repo);
2959 				if (err)
2960 					break;
2961 
2962 				/* Prepare for next tree. */
2963 				free(tree.entries);
2964 				memset(&tree, 0, sizeof(tree));
2965 				nentries = -1;
2966 			}
2967 			break;
2968 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2969 			/* All trees have been found and traversed. */
2970 			if (!have_commit || path == NULL || nentries != -1) {
2971 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2972 				break;
2973 			}
2974 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2975 			if (err)
2976 				break;
2977 			have_commit = 0;
2978 			break;
2979 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2980 			*found_all_objects = 1;
2981 			done = 1;
2982 			break;
2983 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
2984 			done = 1;
2985 			break;
2986 		default:
2987 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2988 			break;
2989 		}
2990 
2991 		imsg_free(&imsg);
2992 		if (err)
2993 			break;
2994 	}
2995 
2996 	free(path);
2997 	free(canon_path);
2998 	free(tree.entries);
2999 	return err;
3000 }
3001 
3002 const struct got_error *
3003 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3004     struct got_object_id *id)
3005 {
3006 	struct got_imsg_raw_delta_request dreq;
3007 
3008 	memset(&dreq, 0, sizeof(dreq));
3009 	dreq.idx = idx;
3010 	memcpy(&dreq.id, id, sizeof(dreq.id));
3011 
3012 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3013 	    &dreq, sizeof(dreq)) == -1)
3014 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3015 
3016 	return flush_imsg(ibuf);
3017 }
3018 
3019 const struct got_error *
3020 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3021 {
3022 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3023 }
3024 
3025 const struct got_error *
3026 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3027     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3028     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3029 {
3030 	struct got_imsg_raw_delta idelta;
3031 	int ret;
3032 
3033 	memset(&idelta, 0, sizeof(idelta));
3034 	idelta.base_size = base_size;
3035 	idelta.result_size = result_size;
3036 	idelta.delta_size = delta_size;
3037 	idelta.delta_compressed_size = delta_compressed_size;
3038 	idelta.delta_offset = delta_offset;
3039 	idelta.delta_out_offset = delta_out_offset;
3040 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3041 
3042 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3043 	    &idelta, sizeof(idelta));
3044 	if (ret == -1)
3045 		return got_error_from_errno("imsg_compose RAW_DELTA");
3046 
3047 	return flush_imsg(ibuf);
3048 }
3049 
3050 const struct got_error *
3051 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3052     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3053     off_t *delta_out_offset, struct got_object_id **base_id,
3054     struct imsgbuf *ibuf)
3055 {
3056 	const struct got_error *err = NULL;
3057 	struct imsg imsg;
3058 	struct got_imsg_raw_delta *delta;
3059 	size_t datalen;
3060 
3061 	*base_size = 0;
3062 	*result_size = 0;
3063 	*delta_size = 0;
3064 	*delta_compressed_size = 0;
3065 	*delta_offset = 0;
3066 	*delta_out_offset = 0;
3067 	*base_id = NULL;
3068 
3069 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3070 	if (err)
3071 		return err;
3072 
3073 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3074 
3075 	switch (imsg.hdr.type) {
3076 	case GOT_IMSG_RAW_DELTA:
3077 		if (datalen != sizeof(*delta)) {
3078 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3079 			break;
3080 		}
3081 		delta = imsg.data;
3082 		*base_size = delta->base_size;
3083 		*result_size = delta->result_size;
3084 		*delta_size = delta->delta_size;
3085 		*delta_compressed_size = delta->delta_compressed_size;
3086 		*delta_offset = delta->delta_offset;
3087 		*delta_out_offset = delta->delta_out_offset;
3088 		*base_id = calloc(1, sizeof(**base_id));
3089 		if (*base_id == NULL) {
3090 			err = got_error_from_errno("malloc");
3091 			break;
3092 		}
3093 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3094 		break;
3095 	default:
3096 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3097 		break;
3098 	}
3099 
3100 	imsg_free(&imsg);
3101 
3102 	if (err) {
3103 		free(*base_id);
3104 		*base_id = NULL;
3105 	}
3106 	return err;
3107 }
3108 
3109 static const struct got_error *
3110 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3111 {
3112 	const struct got_error *err = NULL;
3113 	struct got_imsg_object_idlist idlist;
3114 	struct ibuf *wbuf;
3115 	size_t i;
3116 
3117 	memset(&idlist, 0, sizeof(idlist));
3118 
3119 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3120 		return got_error(GOT_ERR_NO_SPACE);
3121 
3122 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3123 	    sizeof(idlist) + nids * sizeof(**ids));
3124 	if (wbuf == NULL) {
3125 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3126 		return err;
3127 	}
3128 
3129 	idlist.nids = nids;
3130 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3131 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3132 
3133 	for (i = 0; i < nids; i++) {
3134 		struct got_object_id *id = ids[i];
3135 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3136 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3137 	}
3138 
3139 	wbuf->fd = -1;
3140 	imsg_close(ibuf, wbuf);
3141 
3142 	return flush_imsg(ibuf);
3143 }
3144 
3145 const struct got_error *
3146 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3147     struct got_object_id **ids, size_t nids)
3148 {
3149 	const struct got_error *err = NULL;
3150 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3151 	int i, queued = 0;
3152 
3153 	for (i = 0; i < nids; i++) {
3154 		idlist[i % nitems(idlist)] = ids[i];
3155 		queued++;
3156 		if (queued >= nitems(idlist)) {
3157 			err = send_idlist(ibuf, idlist, queued);
3158 			if (err)
3159 				return err;
3160 			queued = 0;
3161 		}
3162 	}
3163 
3164 	if (queued > 0) {
3165 		err = send_idlist(ibuf, idlist, queued);
3166 		if (err)
3167 			return err;
3168 	}
3169 
3170 	return NULL;
3171 }
3172 
3173 const struct got_error *
3174 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3175 {
3176 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3177 	    == -1)
3178 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3179 
3180 	return flush_imsg(ibuf);
3181 }
3182 
3183 const struct got_error *
3184 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3185     size_t *nids, struct imsgbuf *ibuf)
3186 {
3187 	const struct got_error *err = NULL;
3188 	struct imsg imsg;
3189 	struct got_imsg_object_idlist *idlist;
3190 	size_t datalen;
3191 
3192 	*ids = NULL;
3193 	*done = 0;
3194 	*nids = 0;
3195 
3196 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3197 	if (err)
3198 		return err;
3199 
3200 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3201 	switch (imsg.hdr.type) {
3202 	case GOT_IMSG_OBJ_ID_LIST:
3203 		if (datalen < sizeof(*idlist)) {
3204 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3205 			break;
3206 		}
3207 		idlist = imsg.data;
3208 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3209 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3210 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3211 			break;
3212 		}
3213 		*nids = idlist->nids;
3214 		*ids = calloc(*nids, sizeof(**ids));
3215 		if (*ids == NULL) {
3216 			err = got_error_from_errno("calloc");
3217 			break;
3218 		}
3219 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3220 		    *nids * sizeof(**ids));
3221 		break;
3222 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3223 		*done = 1;
3224 		break;
3225 	default:
3226 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3227 		break;
3228 	}
3229 
3230 	imsg_free(&imsg);
3231 
3232 	return err;
3233 }
3234 
3235 const struct got_error *
3236 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3237 {
3238 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3239 	    == -1)
3240 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3241 
3242 	return flush_imsg(ibuf);
3243 }
3244 
3245 const struct got_error *
3246 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3247     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3248 {
3249 	const struct got_error *err = NULL;
3250 	struct ibuf *wbuf;
3251 	struct got_imsg_reused_deltas ideltas;
3252 	size_t i;
3253 
3254 	memset(&ideltas, 0, sizeof(ideltas));
3255 
3256 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3257 		return got_error(GOT_ERR_NO_SPACE);
3258 
3259 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3260 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3261 	if (wbuf == NULL) {
3262 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3263 		return err;
3264 	}
3265 
3266 	ideltas.ndeltas = ndeltas;
3267 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3268 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3269 
3270 	for (i = 0; i < ndeltas; i++) {
3271 		struct got_imsg_reused_delta *delta = &deltas[i];
3272 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3273 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3274 	}
3275 
3276 	wbuf->fd = -1;
3277 	imsg_close(ibuf, wbuf);
3278 
3279 	return flush_imsg(ibuf);
3280 }
3281 
3282 const struct got_error *
3283 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3284 {
3285 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3286 	    == -1)
3287 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3288 
3289 	return flush_imsg(ibuf);
3290 }
3291 
3292 const struct got_error *
3293 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3294     size_t *ndeltas, struct imsgbuf *ibuf)
3295 {
3296 	const struct got_error *err = NULL;
3297 	struct imsg imsg;
3298 	struct got_imsg_reused_deltas *ideltas;
3299 	size_t datalen;
3300 
3301 	*done = 0;
3302 	*ndeltas = 0;
3303 
3304 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3305 	if (err)
3306 		return err;
3307 
3308 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3309 	switch (imsg.hdr.type) {
3310 	case GOT_IMSG_REUSED_DELTAS:
3311 		if (datalen < sizeof(*ideltas)) {
3312 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3313 			break;
3314 		}
3315 		ideltas = imsg.data;
3316 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3317 		    ideltas->ndeltas * sizeof(*deltas) >
3318 		    datalen - sizeof(*ideltas)) {
3319 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3320 			break;
3321 		}
3322 		*ndeltas = ideltas->ndeltas;
3323 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3324 		    *ndeltas * sizeof(*deltas));
3325 		break;
3326 	case GOT_IMSG_DELTA_REUSE_DONE:
3327 		*done = 1;
3328 		break;
3329 	default:
3330 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3331 		break;
3332 	}
3333 
3334 	imsg_free(&imsg);
3335 
3336 	return err;
3337 }
3338 
3339 const struct got_error *
3340 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3341 {
3342 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3343 	    0, 0, -1, NULL, 0)
3344 	    == -1)
3345 		return got_error_from_errno("imsg_compose "
3346 		    "COMMIT_PAINTING_INIT");
3347 
3348 	return flush_imsg(ibuf);
3349 }
3350 
3351 const struct got_error *
3352 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3353     struct got_object_id *id, intptr_t color)
3354 {
3355 	struct got_imsg_commit_painting_request ireq;
3356 
3357 	memset(&ireq, 0, sizeof(ireq));
3358 	memcpy(ireq.id, id->sha1, sizeof(ireq.id));
3359 	ireq.idx = idx;
3360 	ireq.color = color;
3361 
3362 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3363 	    &ireq, sizeof(ireq)) == -1)
3364 		return got_error_from_errno("imsg_compose "
3365 		    "COMMIT_PAINTING_REQUEST");
3366 
3367 	return flush_imsg(ibuf);
3368 }
3369 
3370 static const struct got_error *
3371 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3372     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3373 {
3374 	const struct got_error *err = NULL;
3375 	struct ibuf *wbuf = NULL;
3376 	struct got_object_qid *qid;
3377 	size_t msglen;
3378 	int ncommits;
3379 	intptr_t color;
3380 
3381 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3382 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3383 	    sizeof(struct got_imsg_painted_commit);
3384 
3385 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3386 	if (wbuf == NULL) {
3387 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3388 		return err;
3389 	}
3390 
3391 	/* Keep in sync with struct got_imsg_painted_commits! */
3392 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3393 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3394 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3395 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3396 
3397 	while (ncommits > 0) {
3398 		qid = STAILQ_FIRST(ids);
3399 		STAILQ_REMOVE_HEAD(ids, entry);
3400 		ncommits--;
3401 		(*nids)--;
3402 		color = (intptr_t)qid->data;
3403 
3404 		/* Keep in sync with struct got_imsg_painted_commit! */
3405 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3406 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3407 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3408 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3409 
3410 		got_object_qid_free(qid);
3411 	}
3412 
3413 	wbuf->fd = -1;
3414 	imsg_close(ibuf, wbuf);
3415 
3416 	return flush_imsg(ibuf);
3417 }
3418 
3419 const struct got_error *
3420 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3421     struct got_object_id_queue *ids, int *nids,
3422     int present_in_pack, int flush)
3423 {
3424 	const struct got_error *err;
3425 	size_t remain;
3426 
3427 	if (*nids <= 0)
3428 		return NULL;
3429 
3430 	do {
3431 		remain = (sizeof(struct got_imsg_painted_commits)) +
3432 		    *nids * sizeof(struct got_imsg_painted_commit);
3433 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3434 			err = send_painted_commits(ids, nids, remain,
3435 			    present_in_pack, ibuf);
3436 			if (err)
3437 				return err;
3438 		}
3439 	} while (flush && *nids > 0);
3440 
3441 	return NULL;
3442 }
3443 
3444 const struct got_error *
3445 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3446 {
3447 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3448 	    0, 0, -1, NULL, 0)
3449 	    == -1)
3450 		return got_error_from_errno("imsg_compose "
3451 		    "COMMIT_PAINTING_DONE");
3452 
3453 	return flush_imsg(ibuf);
3454 }
3455 
3456 const struct got_error *
3457 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3458     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3459 {
3460 	const struct got_error *err = NULL;
3461 	struct imsg imsg;
3462 	struct got_imsg_painted_commits icommits;
3463 	struct got_imsg_painted_commit icommit;
3464 	size_t datalen;
3465 	int i;
3466 
3467 	for (;;) {
3468 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3469 		if (err)
3470 			return err;
3471 
3472 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3473 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3474 			break;
3475 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3476 			return got_error(GOT_ERR_PRIVSEP_MSG);
3477 
3478 		if (datalen < sizeof(icommits))
3479 			return got_error(GOT_ERR_PRIVSEP_LEN);
3480 		memcpy(&icommits, imsg.data, sizeof(icommits));
3481 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3482 		    datalen < sizeof(icommits) +
3483 		    icommits.ncommits * sizeof(icommit))
3484 			return got_error(GOT_ERR_PRIVSEP_LEN);
3485 
3486 		for (i = 0; i < icommits.ncommits; i++) {
3487 			memcpy(&icommit,
3488 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3489 			    sizeof(icommit));
3490 
3491 			if (icommits.present_in_pack) {
3492 				struct got_object_id id;
3493 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3494 				err = cb(cb_arg, &id, icommit.color);
3495 				if (err)
3496 					break;
3497 			} else {
3498 				struct got_object_qid *qid;
3499 				err = got_object_qid_alloc_partial(&qid);
3500 				if (err)
3501 					break;
3502 				memcpy(qid->id.sha1, icommit.id,
3503 				    SHA1_DIGEST_LENGTH);
3504 				qid->data = (void *)icommit.color;
3505 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3506 			}
3507 		}
3508 
3509 		imsg_free(&imsg);
3510 	}
3511 
3512 	return err;
3513 }
3514 
3515 const struct got_error *
3516 got_privsep_unveil_exec_helpers(void)
3517 {
3518 	const char *helpers[] = {
3519 	    GOT_PATH_PROG_READ_PACK,
3520 	    GOT_PATH_PROG_READ_OBJECT,
3521 	    GOT_PATH_PROG_READ_COMMIT,
3522 	    GOT_PATH_PROG_READ_TREE,
3523 	    GOT_PATH_PROG_READ_BLOB,
3524 	    GOT_PATH_PROG_READ_TAG,
3525 	    GOT_PATH_PROG_READ_GITCONFIG,
3526 	    GOT_PATH_PROG_READ_GOTCONFIG,
3527 	    GOT_PATH_PROG_READ_PATCH,
3528 	    GOT_PATH_PROG_FETCH_PACK,
3529 	    GOT_PATH_PROG_INDEX_PACK,
3530 	    GOT_PATH_PROG_SEND_PACK,
3531 	};
3532 	size_t i;
3533 
3534 	for (i = 0; i < nitems(helpers); i++) {
3535 		if (unveil(helpers[i], "x") == 0)
3536 			continue;
3537 		return got_error_from_errno2("unveil", helpers[i]);
3538 	}
3539 
3540 	return NULL;
3541 }
3542 
3543 void
3544 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3545 {
3546 	if (close(imsg_fds[0]) == -1) {
3547 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3548 		_exit(1);
3549 	}
3550 
3551 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3552 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3553 		_exit(1);
3554 	}
3555 
3556 	closefrom(GOT_IMSG_FD_CHILD + 1);
3557 
3558 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3559 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3560 		    strerror(errno));
3561 		_exit(1);
3562 	}
3563 }