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