1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/uio.h>
20 #include <sys/wait.h>
21 
22 #include <ctype.h>
23 #include <limits.h>
24 #include <signal.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <stdint.h>
30 #include <poll.h>
31 #include <unistd.h>
32 #include <zlib.h>
33 #include <time.h>
34 
35 #include "got_compat.h"
36 
37 #include "got_object.h"
38 #include "got_error.h"
39 #include "got_path.h"
40 #include "got_repository.h"
41 
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49 
50 #ifndef MIN
51 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
52 #endif
53 
54 #ifndef nitems
55 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
56 #endif
57 
58 static const struct got_error *
59 poll_fd(int fd, int events, int timeout)
60 {
61 	struct pollfd pfd[1];
62 	struct timespec ts;
63 	sigset_t sigset;
64 	int n;
65 
66 	pfd[0].fd = fd;
67 	pfd[0].events = events;
68 
69 	ts.tv_sec = timeout;
70 	ts.tv_nsec = 0;
71 
72 	if (sigemptyset(&sigset) == -1)
73 		return got_error_from_errno("sigemptyset");
74 	if (sigaddset(&sigset, SIGWINCH) == -1)
75 		return got_error_from_errno("sigaddset");
76 
77 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
78 	if (n == -1)
79 		return got_error_from_errno("ppoll");
80 	if (n == 0)
81 		return got_error(GOT_ERR_TIMEOUT);
82 	if (pfd[0].revents & (POLLERR | POLLNVAL))
83 		return got_error_from_errno("poll error");
84 	if (pfd[0].revents & (events | POLLHUP))
85 		return NULL;
86 
87 	return got_error(GOT_ERR_INTERRUPT);
88 }
89 
90 static const struct got_error *
91 read_imsg(struct imsgbuf *ibuf)
92 {
93 	const struct got_error *err;
94 	size_t n;
95 
96 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
97 	if (err)
98 		return err;
99 
100 	n = imsg_read(ibuf);
101 	if (n == -1) {
102 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
103 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
104 		return got_error(GOT_ERR_PRIVSEP_READ);
105 	}
106 	if (n == 0)
107 		return got_error(GOT_ERR_PRIVSEP_PIPE);
108 
109 	return NULL;
110 }
111 
112 const struct got_error *
113 got_privsep_wait_for_child(pid_t pid)
114 {
115 	int child_status;
116 
117 	if (waitpid(pid, &child_status, 0) == -1)
118 		return got_error_from_errno("waitpid");
119 
120 	if (!WIFEXITED(child_status))
121 		return got_error(GOT_ERR_PRIVSEP_DIED);
122 
123 	if (WEXITSTATUS(child_status) != 0)
124 		return got_error(GOT_ERR_PRIVSEP_EXIT);
125 
126 	return NULL;
127 }
128 
129 static const struct got_error *
130 recv_imsg_error(struct imsg *imsg, size_t datalen)
131 {
132 	struct got_imsg_error *ierr;
133 
134 	if (datalen != sizeof(*ierr))
135 		return got_error(GOT_ERR_PRIVSEP_LEN);
136 
137 	ierr = imsg->data;
138 	if (ierr->code == GOT_ERR_ERRNO) {
139 		static struct got_error serr;
140 		serr.code = GOT_ERR_ERRNO;
141 		serr.msg = strerror(ierr->errno_code);
142 		return &serr;
143 	}
144 
145 	return got_error(ierr->code);
146 }
147 
148 const struct got_error *
149 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
150     size_t min_datalen)
151 {
152 	const struct got_error *err;
153 	ssize_t n;
154 
155 	n = imsg_get(ibuf, imsg);
156 	if (n == -1)
157 		return got_error_from_errno("imsg_get");
158 
159 	while (n == 0) {
160 		err = read_imsg(ibuf);
161 		if (err)
162 			return err;
163 		n = imsg_get(ibuf, imsg);
164 		if (n == -1)
165 			return got_error_from_errno("imsg_get");
166 	}
167 
168 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
169 		return got_error(GOT_ERR_PRIVSEP_LEN);
170 
171 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
172 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
173 		return recv_imsg_error(imsg, datalen);
174 	}
175 
176 	return NULL;
177 }
178 
179 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
180 void
181 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
182 {
183 	const struct got_error *poll_err;
184 	struct got_imsg_error ierr;
185 	int ret;
186 
187 	ierr.code = err->code;
188 	if (err->code == GOT_ERR_ERRNO)
189 		ierr.errno_code = errno;
190 	else
191 		ierr.errno_code = 0;
192 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
193 	if (ret == -1) {
194 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
195 		    getprogname(), err->code, err->msg, strerror(errno));
196 		return;
197 	}
198 
199 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
200 	if (poll_err) {
201 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
202 		    getprogname(), err->code, err->msg, poll_err->msg);
203 		return;
204 	}
205 
206 	ret = imsg_flush(ibuf);
207 	if (ret == -1) {
208 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
209 		    getprogname(), err->code, err->msg, strerror(errno));
210 		imsg_clear(ibuf);
211 		return;
212 	}
213 }
214 
215 static const struct got_error *
216 flush_imsg(struct imsgbuf *ibuf)
217 {
218 	const struct got_error *err;
219 
220 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
221 	if (err)
222 		return err;
223 
224 	if (imsg_flush(ibuf) == -1) {
225 		imsg_clear(ibuf);
226 		return got_error_from_errno("imsg_flush");
227 	}
228 
229 	return NULL;
230 }
231 
232 const struct got_error *
233 got_privsep_flush_imsg(struct imsgbuf *ibuf)
234 {
235 	return flush_imsg(ibuf);
236 }
237 
238 const struct got_error *
239 got_privsep_send_stop(int fd)
240 {
241 	const struct got_error *err = NULL;
242 	struct imsgbuf ibuf;
243 
244 	imsg_init(&ibuf, fd);
245 
246 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
247 		return got_error_from_errno("imsg_compose STOP");
248 
249 	err = flush_imsg(&ibuf);
250 	return err;
251 }
252 
253 const struct got_error *
254 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
255     struct got_object_id *id)
256 {
257 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
258 	    id, sizeof(*id)) == -1)
259 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
260 
261 	return flush_imsg(ibuf);
262 }
263 
264 const struct got_error *
265 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
266     struct got_object_id *id)
267 {
268 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
269 	    id, sizeof(*id)) == -1)
270 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
271 
272 	return flush_imsg(ibuf);
273 }
274 
275 const struct got_error *
276 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
277 {
278 	const struct got_error *err = NULL;
279 
280 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
281 	    == -1) {
282 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
283 		close(outfd);
284 		return err;
285 	}
286 
287 	return flush_imsg(ibuf);
288 }
289 
290 const struct got_error *
291 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
292     uint8_t *data)
293 {
294 	const struct got_error *err = NULL;
295 	struct got_imsg_raw_obj iobj;
296 	size_t len = sizeof(iobj);
297 	struct ibuf *wbuf;
298 
299 	iobj.hdrlen = hdrlen;
300 	iobj.size = size;
301 
302 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
303 		len += (size_t)size + hdrlen;
304 
305 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
306 	if (wbuf == NULL) {
307 		err = got_error_from_errno("imsg_create RAW_OBJECT");
308 		return err;
309 	}
310 
311 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
312 		return got_error_from_errno("imsg_add RAW_OBJECT");
313 
314 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
315 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
316 			return got_error_from_errno("imsg_add RAW_OBJECT");
317 	}
318 
319 	wbuf->fd = -1;
320 	imsg_close(ibuf, wbuf);
321 
322 	return flush_imsg(ibuf);
323 }
324 
325 const struct got_error *
326 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
327     struct imsgbuf *ibuf)
328 {
329 	const struct got_error *err = NULL;
330 	struct imsg imsg;
331 	struct got_imsg_raw_obj *iobj;
332 	size_t datalen;
333 
334 	*outbuf = NULL;
335 
336 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
337 	if (err)
338 		return err;
339 
340 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
341 
342 	switch (imsg.hdr.type) {
343 	case GOT_IMSG_RAW_OBJECT:
344 		if (datalen < sizeof(*iobj)) {
345 			err = got_error(GOT_ERR_PRIVSEP_LEN);
346 			break;
347 		}
348 		iobj = imsg.data;
349 		*size = iobj->size;
350 		*hdrlen = iobj->hdrlen;
351 
352 		if (datalen == sizeof(*iobj)) {
353 			/* Data has been written to file descriptor. */
354 			break;
355 		}
356 
357 		if (*size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
358 			err = got_error(GOT_ERR_PRIVSEP_LEN);
359 			break;
360 		}
361 
362 		*outbuf = malloc(*size + *hdrlen);
363 		if (*outbuf == NULL) {
364 			err = got_error_from_errno("malloc");
365 			break;
366 		}
367 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
368 		break;
369 	default:
370 		err = got_error(GOT_ERR_PRIVSEP_MSG);
371 		break;
372 	}
373 
374 	imsg_free(&imsg);
375 
376 	return err;
377 }
378 
379 const struct got_error *
380 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
381     struct got_object_id *id, int pack_idx)
382 {
383 	const struct got_error *err = NULL;
384 	struct got_imsg_packed_object iobj;
385 	void *data;
386 	size_t len;
387 
388 	if (pack_idx != -1) { /* commit is packed */
389 		iobj.idx = pack_idx;
390 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
391 		data = &iobj;
392 		len = sizeof(iobj);
393 	} else {
394 		data = id;
395 		len = sizeof(*id);
396 	}
397 
398 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
399 	    == -1) {
400 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
401 		close(fd);
402 		return err;
403 	}
404 
405 	return flush_imsg(ibuf);
406 }
407 
408 const struct got_error *
409 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
410     struct got_object_id *id, int pack_idx)
411 {
412 	struct ibuf *wbuf;
413 	size_t len;
414 
415 	if (pack_idx != -1)
416 		len = sizeof(struct got_imsg_packed_object);
417 	else
418 		len = sizeof(*id);
419 
420 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
421 	if (wbuf == NULL)
422 		return got_error_from_errno("imsg_create TREE_REQUEST");
423 
424 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
425 		return got_error_from_errno("imsg_add TREE_REQUEST");
426 
427 	if (pack_idx != -1) { /* tree is packed */
428 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
429 			return got_error_from_errno("imsg_add TREE_REQUEST");
430 	}
431 
432 	wbuf->fd = fd;
433 	imsg_close(ibuf, wbuf);
434 
435 	return flush_imsg(ibuf);
436 }
437 
438 const struct got_error *
439 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
440     struct got_object_id *id, int pack_idx)
441 {
442 	struct got_imsg_packed_object iobj;
443 	void *data;
444 	size_t len;
445 
446 	if (pack_idx != -1) { /* tag is packed */
447 		iobj.idx = pack_idx;
448 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
449 		data = &iobj;
450 		len = sizeof(iobj);
451 	} else {
452 		data = id;
453 		len = sizeof(*id);
454 	}
455 
456 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
457 	    == -1)
458 		return got_error_from_errno("imsg_compose TAG_REQUEST");
459 
460 	return flush_imsg(ibuf);
461 }
462 
463 const struct got_error *
464 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
465     struct got_object_id *id, int pack_idx)
466 {
467 	const struct got_error *err = NULL;
468 	struct got_imsg_packed_object iobj;
469 	void *data;
470 	size_t len;
471 
472 	if (pack_idx != -1) { /* blob is packed */
473 		iobj.idx = pack_idx;
474 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
475 		data = &iobj;
476 		len = sizeof(iobj);
477 	} else {
478 		data = id;
479 		len = sizeof(*id);
480 	}
481 
482 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
483 	    == -1) {
484 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
485 		close(infd);
486 		return err;
487 	}
488 
489 	return flush_imsg(ibuf);
490 }
491 
492 const struct got_error *
493 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
494 {
495 	const struct got_error *err = NULL;
496 
497 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
498 	    == -1) {
499 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
500 		close(outfd);
501 		return err;
502 	}
503 
504 	return flush_imsg(ibuf);
505 }
506 
507 static const struct got_error *
508 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
509 {
510 	const struct got_error *err = NULL;
511 
512 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
513 		err = got_error_from_errno("imsg_compose TMPFD");
514 		close(fd);
515 		return err;
516 	}
517 
518 	return flush_imsg(ibuf);
519 }
520 
521 const struct got_error *
522 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
523 {
524 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
525 }
526 
527 const struct got_error *
528 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
529 {
530 	struct got_imsg_object iobj;
531 
532 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
533 	iobj.type = obj->type;
534 	iobj.flags = obj->flags;
535 	iobj.hdrlen = obj->hdrlen;
536 	iobj.size = obj->size;
537 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
538 		iobj.pack_offset = obj->pack_offset;
539 		iobj.pack_idx = obj->pack_idx;
540 	}
541 
542 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
543 	    == -1)
544 		return got_error_from_errno("imsg_compose OBJECT");
545 
546 	return flush_imsg(ibuf);
547 }
548 
549 const struct got_error *
550 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
551     struct got_pathlist_head *have_refs, int fetch_all_branches,
552     struct got_pathlist_head *wanted_branches,
553     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
554 {
555 	const struct got_error *err = NULL;
556 	struct ibuf *wbuf;
557 	size_t len;
558 	struct got_pathlist_entry *pe;
559 	struct got_imsg_fetch_request fetchreq;
560 
561 	memset(&fetchreq, 0, sizeof(fetchreq));
562 	fetchreq.fetch_all_branches = fetch_all_branches;
563 	fetchreq.list_refs_only = list_refs_only;
564 	fetchreq.verbosity = verbosity;
565 	TAILQ_FOREACH(pe, have_refs, entry)
566 		fetchreq.n_have_refs++;
567 	TAILQ_FOREACH(pe, wanted_branches, entry)
568 		fetchreq.n_wanted_branches++;
569 	TAILQ_FOREACH(pe, wanted_refs, entry)
570 		fetchreq.n_wanted_refs++;
571 	len = sizeof(struct got_imsg_fetch_request);
572 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
573 		close(fd);
574 		return got_error(GOT_ERR_NO_SPACE);
575 	}
576 
577 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
578 	    &fetchreq, sizeof(fetchreq)) == -1)
579 		return got_error_from_errno(
580 		    "imsg_compose FETCH_SERVER_PROGRESS");
581 
582 	err = flush_imsg(ibuf);
583 	if (err) {
584 		close(fd);
585 		return err;
586 	}
587 	fd = -1;
588 
589 	TAILQ_FOREACH(pe, have_refs, entry) {
590 		const char *name = pe->path;
591 		size_t name_len = pe->path_len;
592 		struct got_object_id *id = pe->data;
593 
594 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
595 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
596 		if (wbuf == NULL)
597 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
598 
599 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
600 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
601 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
602 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
603 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
604 		if (imsg_add(wbuf, name, name_len) == -1)
605 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
606 
607 		wbuf->fd = -1;
608 		imsg_close(ibuf, wbuf);
609 		err = flush_imsg(ibuf);
610 		if (err)
611 			return err;
612 	}
613 
614 	TAILQ_FOREACH(pe, wanted_branches, entry) {
615 		const char *name = pe->path;
616 		size_t name_len = pe->path_len;
617 
618 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
619 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
620 		    len);
621 		if (wbuf == NULL)
622 			return got_error_from_errno(
623 			    "imsg_create FETCH_WANTED_BRANCH");
624 
625 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
626 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
627 			return got_error_from_errno(
628 			    "imsg_add FETCH_WANTED_BRANCH");
629 		if (imsg_add(wbuf, name, name_len) == -1)
630 			return got_error_from_errno(
631 			    "imsg_add FETCH_WANTED_BRANCH");
632 
633 		wbuf->fd = -1;
634 		imsg_close(ibuf, wbuf);
635 		err = flush_imsg(ibuf);
636 		if (err)
637 			return err;
638 	}
639 
640 	TAILQ_FOREACH(pe, wanted_refs, entry) {
641 		const char *name = pe->path;
642 		size_t name_len = pe->path_len;
643 
644 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
645 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
646 		    len);
647 		if (wbuf == NULL)
648 			return got_error_from_errno(
649 			    "imsg_create FETCH_WANTED_REF");
650 
651 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
652 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
653 			return got_error_from_errno(
654 			    "imsg_add FETCH_WANTED_REF");
655 		if (imsg_add(wbuf, name, name_len) == -1)
656 			return got_error_from_errno(
657 			    "imsg_add FETCH_WANTED_REF");
658 
659 		wbuf->fd = -1;
660 		imsg_close(ibuf, wbuf);
661 		err = flush_imsg(ibuf);
662 		if (err)
663 			return err;
664 	}
665 
666 
667 	return NULL;
668 
669 }
670 
671 const struct got_error *
672 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
673 {
674 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
675 }
676 
677 const struct got_error *
678 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
679     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
680     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
681 {
682 	const struct got_error *err = NULL;
683 	struct imsg imsg;
684 	size_t datalen;
685 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
686 	size_t n, remain;
687 	off_t off;
688 	int i;
689 
690 	*done = 0;
691 	*id = NULL;
692 	*refname = NULL;
693 	*server_progress = NULL;
694 	*packfile_size = 0;
695 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
696 
697 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
698 	if (err)
699 		return err;
700 
701 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
702 	switch (imsg.hdr.type) {
703 	case GOT_IMSG_ERROR:
704 		if (datalen < sizeof(struct got_imsg_error)) {
705 			err = got_error(GOT_ERR_PRIVSEP_LEN);
706 			break;
707 		}
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 			if (datalen < sizeof(struct got_imsg_error)) {
933 				err = got_error(GOT_ERR_PRIVSEP_LEN);
934 				goto done;
935 			}
936 			err = recv_imsg_error(&imsg, datalen);
937 			goto done;
938 		case GOT_IMSG_SEND_REMOTE_REF:
939 			if (datalen < sizeof(iremote_ref)) {
940 				err = got_error(GOT_ERR_PRIVSEP_MSG);
941 				goto done;
942 			}
943 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
944 			if (datalen != sizeof(iremote_ref) +
945 			    iremote_ref.name_len) {
946 				err = got_error(GOT_ERR_PRIVSEP_MSG);
947 				goto done;
948 			}
949 			id = malloc(sizeof(*id));
950 			if (id == NULL) {
951 				err = got_error_from_errno("malloc");
952 				goto done;
953 			}
954 			memcpy(id->sha1, iremote_ref.id, SHA1_DIGEST_LENGTH);
955 			refname = strndup(imsg.data + sizeof(iremote_ref),
956 			    datalen - sizeof(iremote_ref));
957 			if (refname == NULL) {
958 				err = got_error_from_errno("strndup");
959 				goto done;
960 			}
961 			err = got_pathlist_insert(&new, remote_refs,
962 			    refname, id);
963 			if (err)
964 				goto done;
965 			if (new == NULL) { /* duplicate which wasn't inserted */
966 				free(id);
967 				free(refname);
968 			}
969 			id = NULL;
970 			refname = NULL;
971 			break;
972 		case GOT_IMSG_SEND_PACK_REQUEST:
973 			if (datalen != 0) {
974 				err = got_error(GOT_ERR_PRIVSEP_MSG);
975 				goto done;
976 			}
977 			/* got-send-pack is now waiting for a pack file. */
978 			done = 1;
979 			break;
980 		default:
981 			err = got_error(GOT_ERR_PRIVSEP_MSG);
982 			break;
983 		}
984 	}
985 done:
986 	free(id);
987 	free(refname);
988 	imsg_free(&imsg);
989 	return err;
990 }
991 
992 const struct got_error *
993 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
994 {
995 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
996 }
997 
998 const struct got_error *
999 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
1000     int *success, char **refname, struct imsgbuf *ibuf)
1001 {
1002 	const struct got_error *err = NULL;
1003 	struct imsg imsg;
1004 	size_t datalen;
1005 	struct got_imsg_send_ref_status iref_status;
1006 
1007 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1008 	*done = 0;
1009 	*success = 0;
1010 	*refname = NULL;
1011 
1012 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1013 	if (err)
1014 		return err;
1015 
1016 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1017 	switch (imsg.hdr.type) {
1018 	case GOT_IMSG_ERROR:
1019 		if (datalen < sizeof(struct got_imsg_error)) {
1020 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1021 			break;
1022 		}
1023 		err = recv_imsg_error(&imsg, datalen);
1024 		break;
1025 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1026 		if (datalen < sizeof(*bytes_sent)) {
1027 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1028 			break;
1029 		}
1030 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1031 		break;
1032 	case GOT_IMSG_SEND_REF_STATUS:
1033 		if (datalen < sizeof(iref_status)) {
1034 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1035 			break;
1036 		}
1037 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1038 		if (datalen != sizeof(iref_status) + iref_status.name_len) {
1039 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1040 			break;
1041 		}
1042 		*success = iref_status.success;
1043 		*refname = strndup(imsg.data + sizeof(iref_status),
1044 		    iref_status.name_len);
1045 		break;
1046 	case GOT_IMSG_SEND_DONE:
1047 		if (datalen != 0) {
1048 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1049 			break;
1050 		}
1051 		*done = 1;
1052 		break;
1053 	default:
1054 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1055 		break;
1056 	}
1057 
1058 	imsg_free(&imsg);
1059 	return err;
1060 }
1061 
1062 const struct got_error *
1063 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1064     int fd)
1065 {
1066 	const struct got_error *err = NULL;
1067 
1068 	/* Keep in sync with struct got_imsg_index_pack_request */
1069 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1070 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1071 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1072 		close(fd);
1073 		return err;
1074 	}
1075 	return flush_imsg(ibuf);
1076 }
1077 
1078 const struct got_error *
1079 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1080 {
1081 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1082 }
1083 
1084 const struct got_error *
1085 got_privsep_recv_index_progress(int *done, int *nobj_total,
1086     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1087     struct imsgbuf *ibuf)
1088 {
1089 	const struct got_error *err = NULL;
1090 	struct imsg imsg;
1091 	struct got_imsg_index_pack_progress *iprogress;
1092 	size_t datalen;
1093 
1094 	*done = 0;
1095 	*nobj_total = 0;
1096 	*nobj_indexed = 0;
1097 	*nobj_resolved = 0;
1098 
1099 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1100 	if (err)
1101 		return err;
1102 
1103 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1104 	switch (imsg.hdr.type) {
1105 	case GOT_IMSG_ERROR:
1106 		if (datalen < sizeof(struct got_imsg_error)) {
1107 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1108 			break;
1109 		}
1110 		err = recv_imsg_error(&imsg, datalen);
1111 		break;
1112 	case GOT_IMSG_IDXPACK_PROGRESS:
1113 		if (datalen < sizeof(*iprogress)) {
1114 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1115 			break;
1116 		}
1117 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1118 		*nobj_total = iprogress->nobj_total;
1119 		*nobj_indexed = iprogress->nobj_indexed;
1120 		*nobj_loose = iprogress->nobj_loose;
1121 		*nobj_resolved = iprogress->nobj_resolved;
1122 		break;
1123 	case GOT_IMSG_IDXPACK_DONE:
1124 		if (datalen != 0) {
1125 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1126 			break;
1127 		}
1128 		*done = 1;
1129 		break;
1130 	default:
1131 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1132 		break;
1133 	}
1134 
1135 	imsg_free(&imsg);
1136 	return err;
1137 }
1138 
1139 const struct got_error *
1140 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1141     struct imsgbuf *ibuf)
1142 {
1143 	struct got_imsg_object *iobj;
1144 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1145 
1146 	if (datalen != sizeof(*iobj))
1147 		return got_error(GOT_ERR_PRIVSEP_LEN);
1148 	iobj = imsg->data;
1149 
1150 	*obj = calloc(1, sizeof(**obj));
1151 	if (*obj == NULL)
1152 		return got_error_from_errno("calloc");
1153 
1154 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1155 	(*obj)->type = iobj->type;
1156 	(*obj)->flags = iobj->flags;
1157 	(*obj)->hdrlen = iobj->hdrlen;
1158 	(*obj)->size = iobj->size;
1159 	/* path_packfile is handled by caller */
1160 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1161 		(*obj)->pack_offset = iobj->pack_offset;
1162 		(*obj)->pack_idx = iobj->pack_idx;
1163 	}
1164 	STAILQ_INIT(&(*obj)->deltas.entries);
1165 	return NULL;
1166 }
1167 
1168 const struct got_error *
1169 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1170 {
1171 	const struct got_error *err = NULL;
1172 	struct imsg imsg;
1173 	const size_t min_datalen =
1174 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1175 
1176 	*obj = NULL;
1177 
1178 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1179 	if (err)
1180 		return err;
1181 
1182 	switch (imsg.hdr.type) {
1183 	case GOT_IMSG_OBJECT:
1184 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1185 		break;
1186 	default:
1187 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1188 		break;
1189 	}
1190 
1191 	imsg_free(&imsg);
1192 
1193 	return err;
1194 }
1195 
1196 static const struct got_error *
1197 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1198     size_t logmsg_len)
1199 {
1200 	const struct got_error *err = NULL;
1201 	size_t offset, remain;
1202 
1203 	offset = 0;
1204 	remain = logmsg_len;
1205 	while (remain > 0) {
1206 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1207 
1208 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1209 		    commit->logmsg + offset, n) == -1) {
1210 			err = got_error_from_errno("imsg_compose "
1211 			    "COMMIT_LOGMSG");
1212 			break;
1213 		}
1214 
1215 		err = flush_imsg(ibuf);
1216 		if (err)
1217 			break;
1218 
1219 		offset += n;
1220 		remain -= n;
1221 	}
1222 
1223 	return err;
1224 }
1225 
1226 const struct got_error *
1227 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1228 {
1229 	const struct got_error *err = NULL;
1230 	struct got_imsg_commit_object *icommit;
1231 	uint8_t *buf;
1232 	size_t len, total;
1233 	struct got_object_qid *qid;
1234 	size_t author_len = strlen(commit->author);
1235 	size_t committer_len = strlen(commit->committer);
1236 	size_t logmsg_len = strlen(commit->logmsg);
1237 
1238 	total = sizeof(*icommit) + author_len + committer_len +
1239 	    commit->nparents * SHA1_DIGEST_LENGTH;
1240 
1241 	buf = malloc(total);
1242 	if (buf == NULL)
1243 		return got_error_from_errno("malloc");
1244 
1245 	icommit = (struct got_imsg_commit_object *)buf;
1246 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1247 	    sizeof(icommit->tree_id));
1248 	icommit->author_len = author_len;
1249 	icommit->author_time = commit->author_time;
1250 	icommit->author_gmtoff = commit->author_gmtoff;
1251 	icommit->committer_len = committer_len;
1252 	icommit->committer_time = commit->committer_time;
1253 	icommit->committer_gmtoff = commit->committer_gmtoff;
1254 	icommit->logmsg_len = logmsg_len;
1255 	icommit->nparents = commit->nparents;
1256 
1257 	len = sizeof(*icommit);
1258 	memcpy(buf + len, commit->author, author_len);
1259 	len += author_len;
1260 	memcpy(buf + len, commit->committer, committer_len);
1261 	len += committer_len;
1262 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1263 		memcpy(buf + len, &qid->id, SHA1_DIGEST_LENGTH);
1264 		len += SHA1_DIGEST_LENGTH;
1265 	}
1266 
1267 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1268 		err = got_error_from_errno("imsg_compose COMMIT");
1269 		goto done;
1270 	}
1271 
1272 	if (logmsg_len == 0 ||
1273 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1274 		err = flush_imsg(ibuf);
1275 		if (err)
1276 			goto done;
1277 	}
1278 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1279 done:
1280 	free(buf);
1281 	return err;
1282 }
1283 
1284 static const struct got_error *
1285 get_commit_from_imsg(struct got_commit_object **commit,
1286     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1287 {
1288 	const struct got_error *err = NULL;
1289 	struct got_imsg_commit_object *icommit;
1290 	size_t len = 0;
1291 	int i;
1292 
1293 	if (datalen < sizeof(*icommit))
1294 		return got_error(GOT_ERR_PRIVSEP_LEN);
1295 
1296 	icommit = imsg->data;
1297 	if (datalen != sizeof(*icommit) + icommit->author_len +
1298 	    icommit->committer_len +
1299 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1300 		return got_error(GOT_ERR_PRIVSEP_LEN);
1301 
1302 	if (icommit->nparents < 0)
1303 		return got_error(GOT_ERR_PRIVSEP_LEN);
1304 
1305 	len += sizeof(*icommit);
1306 
1307 	*commit = got_object_commit_alloc_partial();
1308 	if (*commit == NULL)
1309 		return got_error_from_errno(
1310 		    "got_object_commit_alloc_partial");
1311 
1312 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1313 	    SHA1_DIGEST_LENGTH);
1314 	(*commit)->author_time = icommit->author_time;
1315 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1316 	(*commit)->committer_time = icommit->committer_time;
1317 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1318 
1319 	if (icommit->author_len == 0) {
1320 		(*commit)->author = strdup("");
1321 		if ((*commit)->author == NULL) {
1322 			err = got_error_from_errno("strdup");
1323 			goto done;
1324 		}
1325 	} else {
1326 		(*commit)->author = malloc(icommit->author_len + 1);
1327 		if ((*commit)->author == NULL) {
1328 			err = got_error_from_errno("malloc");
1329 			goto done;
1330 		}
1331 		memcpy((*commit)->author, imsg->data + len,
1332 		    icommit->author_len);
1333 		(*commit)->author[icommit->author_len] = '\0';
1334 	}
1335 	len += icommit->author_len;
1336 
1337 	if (icommit->committer_len == 0) {
1338 		(*commit)->committer = strdup("");
1339 		if ((*commit)->committer == NULL) {
1340 			err = got_error_from_errno("strdup");
1341 			goto done;
1342 		}
1343 	} else {
1344 		(*commit)->committer =
1345 		    malloc(icommit->committer_len + 1);
1346 		if ((*commit)->committer == NULL) {
1347 			err = got_error_from_errno("malloc");
1348 			goto done;
1349 		}
1350 		memcpy((*commit)->committer, imsg->data + len,
1351 		    icommit->committer_len);
1352 		(*commit)->committer[icommit->committer_len] = '\0';
1353 	}
1354 	len += icommit->committer_len;
1355 
1356 	if (icommit->logmsg_len == 0) {
1357 		(*commit)->logmsg = strdup("");
1358 		if ((*commit)->logmsg == NULL) {
1359 			err = got_error_from_errno("strdup");
1360 			goto done;
1361 		}
1362 	} else {
1363 		size_t offset = 0, remain = icommit->logmsg_len;
1364 
1365 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1366 		if ((*commit)->logmsg == NULL) {
1367 			err = got_error_from_errno("malloc");
1368 			goto done;
1369 		}
1370 		while (remain > 0) {
1371 			struct imsg imsg_log;
1372 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1373 			    remain);
1374 
1375 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1376 			if (err)
1377 				goto done;
1378 
1379 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1380 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1381 				goto done;
1382 			}
1383 
1384 			memcpy((*commit)->logmsg + offset,
1385 			    imsg_log.data, n);
1386 			imsg_free(&imsg_log);
1387 			offset += n;
1388 			remain -= n;
1389 		}
1390 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1391 	}
1392 
1393 	for (i = 0; i < icommit->nparents; i++) {
1394 		struct got_object_qid *qid;
1395 
1396 		err = got_object_qid_alloc_partial(&qid);
1397 		if (err)
1398 			break;
1399 		memcpy(&qid->id, imsg->data + len +
1400 		    i * SHA1_DIGEST_LENGTH, sizeof(qid->id));
1401 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1402 		(*commit)->nparents++;
1403 	}
1404 done:
1405 	if (err) {
1406 		got_object_commit_close(*commit);
1407 		*commit = NULL;
1408 	}
1409 	return err;
1410 }
1411 
1412 const struct got_error *
1413 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1414 {
1415 	const struct got_error *err = NULL;
1416 	struct imsg imsg;
1417 	size_t datalen;
1418 	const size_t min_datalen =
1419 	    MIN(sizeof(struct got_imsg_error),
1420 	    sizeof(struct got_imsg_commit_object));
1421 
1422 	*commit = NULL;
1423 
1424 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1425 	if (err)
1426 		return err;
1427 
1428 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1429 
1430 	switch (imsg.hdr.type) {
1431 	case GOT_IMSG_COMMIT:
1432 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1433 		break;
1434 	default:
1435 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1436 		break;
1437 	}
1438 
1439 	imsg_free(&imsg);
1440 
1441 	return err;
1442 }
1443 
1444 static const struct got_error *
1445 send_tree_entries_batch(struct imsgbuf *ibuf,
1446     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1447 {
1448 	struct ibuf *wbuf;
1449 	struct got_imsg_tree_entries ientries;
1450 	int i;
1451 
1452 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1453 	if (wbuf == NULL)
1454 		return got_error_from_errno("imsg_create TREE_ENTRY");
1455 
1456 	ientries.nentries = idxN - idx0 + 1;
1457 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1458 		return got_error_from_errno("imsg_add TREE_ENTRY");
1459 
1460 	for (i = idx0; i <= idxN; i++) {
1461 		struct got_parsed_tree_entry *pte = &entries[i];
1462 
1463 		/* Keep in sync with struct got_imsg_tree_object definition! */
1464 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1465 			return got_error_from_errno("imsg_add TREE_ENTRY");
1466 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1467 			return got_error_from_errno("imsg_add TREE_ENTRY");
1468 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1469 			return got_error_from_errno("imsg_add TREE_ENTRY");
1470 		
1471 		/* Remaining bytes are the entry's name. */
1472 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1473 			return got_error_from_errno("imsg_add TREE_ENTRY");
1474 	}
1475 
1476 	wbuf->fd = -1;
1477 	imsg_close(ibuf, wbuf);
1478 	return NULL;
1479 }
1480 
1481 static const struct got_error *
1482 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1483     int nentries)
1484 {
1485 	const struct got_error *err = NULL;
1486 	int i, j;
1487 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1488 
1489 	i = 0;
1490 	for (j = 0; j < nentries; j++) {
1491 		struct got_parsed_tree_entry *pte = &entries[j];
1492 		size_t len = sizeof(*pte) + pte->namelen;
1493 
1494 		if (j > 0 &&
1495 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1496 			err = send_tree_entries_batch(ibuf, entries,
1497 			    i, j - 1, entries_len);
1498 			if (err)
1499 				return err;
1500 			i = j;
1501 			entries_len = sizeof(struct got_imsg_tree_entries);
1502 		}
1503 
1504 		entries_len += len;
1505 	}
1506 
1507 	if (j > 0) {
1508 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1509 		    entries_len);
1510 		if (err)
1511 			return err;
1512 	}
1513 
1514 	return NULL;
1515 }
1516 
1517 const struct got_error *
1518 got_privsep_send_tree(struct imsgbuf *ibuf,
1519     struct got_parsed_tree_entry *entries, int nentries)
1520 {
1521 	const struct got_error *err = NULL;
1522 	struct got_imsg_tree_object itree;
1523 
1524 	itree.nentries = nentries;
1525 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1526 	    == -1)
1527 		return got_error_from_errno("imsg_compose TREE");
1528 
1529 	err = send_tree_entries(ibuf, entries, nentries);
1530 	if (err)
1531 		return err;
1532 
1533 	return flush_imsg(ibuf);
1534 }
1535 
1536 
1537 static const struct got_error *
1538 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1539     int *nentries)
1540 {
1541 	const struct got_error *err = NULL;
1542 	struct got_imsg_tree_entries *ientries;
1543 	struct got_tree_entry *te;
1544 	size_t te_offset;
1545 	size_t i;
1546 
1547 	if (datalen <= sizeof(*ientries) ||
1548 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1549 		return got_error(GOT_ERR_PRIVSEP_LEN);
1550 
1551 	ientries = (struct got_imsg_tree_entries *)data;
1552 	if (ientries->nentries > INT_MAX) {
1553 		return got_error_msg(GOT_ERR_NO_SPACE,
1554 		    "too many tree entries");
1555 	}
1556 
1557 	te_offset = sizeof(*ientries);
1558 	for (i = 0; i < ientries->nentries; i++) {
1559 		struct got_imsg_tree_entry ite;
1560 		const char *te_name;
1561 		uint8_t *buf = (uint8_t *)data + te_offset;
1562 
1563 		if (te_offset >= datalen) {
1564 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1565 			break;
1566 		}
1567 
1568 		/* Might not be aligned, size is ~32 bytes. */
1569 		memcpy(&ite, buf, sizeof(ite));
1570 
1571 		if (ite.namelen >= sizeof(te->name)) {
1572 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1573 			break;
1574 		}
1575 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1576 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1577 			break;
1578 		}
1579 
1580 		if (*nentries >= tree->nentries) {
1581 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1582 			break;
1583 		}
1584 		te = &tree->entries[*nentries];
1585 		te_name = buf + sizeof(ite);
1586 		memcpy(te->name, te_name, ite.namelen);
1587 		te->name[ite.namelen] = '\0';
1588 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1589 		te->mode = ite.mode;
1590 		te->idx = *nentries;
1591 		(*nentries)++;
1592 
1593 		te_offset += sizeof(ite) + ite.namelen;
1594 	}
1595 
1596 	return err;
1597 }
1598 
1599 const struct got_error *
1600 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1601 {
1602 	const struct got_error *err = NULL;
1603 	const size_t min_datalen =
1604 	    MIN(sizeof(struct got_imsg_error),
1605 	    sizeof(struct got_imsg_tree_object));
1606 	struct got_imsg_tree_object *itree;
1607 	int nentries = 0;
1608 
1609 	*tree = NULL;
1610 
1611 	err = read_imsg(ibuf);
1612 	if (err)
1613 		goto done;
1614 
1615 	for (;;) {
1616 		struct imsg imsg;
1617 		size_t n;
1618 		size_t datalen;
1619 
1620 		n = imsg_get(ibuf, &imsg);
1621 		if (n == 0) {
1622 			if ((*tree)) {
1623 				if (nentries < (*tree)->nentries) {
1624 					err = read_imsg(ibuf);
1625 					if (err)
1626 						break;
1627 					continue;
1628 				} else
1629 					break;
1630 			} else {
1631 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1632 				break;
1633 			}
1634 		}
1635 
1636 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1637 			imsg_free(&imsg);
1638 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1639 			break;
1640 		}
1641 
1642 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1643 
1644 		switch (imsg.hdr.type) {
1645 		case GOT_IMSG_ERROR:
1646 			err = recv_imsg_error(&imsg, datalen);
1647 			break;
1648 		case GOT_IMSG_TREE:
1649 			/* This message should only appear once. */
1650 			if (*tree != NULL) {
1651 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1652 				break;
1653 			}
1654 			if (datalen != sizeof(*itree)) {
1655 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1656 				break;
1657 			}
1658 			itree = imsg.data;
1659 			if (itree->nentries < 0) {
1660 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1661 				break;
1662 			}
1663 			*tree = malloc(sizeof(**tree));
1664 			if (*tree == NULL) {
1665 				err = got_error_from_errno("malloc");
1666 				break;
1667 			}
1668 			(*tree)->entries = calloc(itree->nentries,
1669 			    sizeof(struct got_tree_entry));
1670 			if ((*tree)->entries == NULL) {
1671 				err = got_error_from_errno("malloc");
1672 				free(*tree);
1673 				*tree = NULL;
1674 				break;
1675 			}
1676 			(*tree)->nentries = itree->nentries;
1677 			(*tree)->refcnt = 0;
1678 			break;
1679 		case GOT_IMSG_TREE_ENTRIES:
1680 			/* This message should be preceeded by GOT_IMSG_TREE. */
1681 			if (*tree == NULL) {
1682 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1683 				break;
1684 			}
1685 			err = recv_tree_entries(imsg.data, datalen,
1686 			    *tree, &nentries);
1687 			break;
1688 		default:
1689 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1690 			break;
1691 		}
1692 
1693 		imsg_free(&imsg);
1694 		if (err)
1695 			break;
1696 	}
1697 done:
1698 	if (*tree && (*tree)->nentries != nentries) {
1699 		if (err == NULL)
1700 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1701 		got_object_tree_close(*tree);
1702 		*tree = NULL;
1703 	}
1704 
1705 	return err;
1706 }
1707 
1708 const struct got_error *
1709 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1710     const uint8_t *data)
1711 {
1712 	struct got_imsg_blob iblob;
1713 
1714 	iblob.size = size;
1715 	iblob.hdrlen = hdrlen;
1716 
1717 	if (data) {
1718 		uint8_t *buf;
1719 
1720 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1721 			return got_error(GOT_ERR_NO_SPACE);
1722 
1723 		buf = malloc(sizeof(iblob) + size);
1724 		if (buf == NULL)
1725 			return got_error_from_errno("malloc");
1726 
1727 		memcpy(buf, &iblob, sizeof(iblob));
1728 		memcpy(buf + sizeof(iblob), data, size);
1729 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1730 		    sizeof(iblob) + size) == -1) {
1731 			free(buf);
1732 			return got_error_from_errno("imsg_compose BLOB");
1733 		}
1734 		free(buf);
1735 	} else {
1736 		/* Data has already been written to file descriptor. */
1737 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1738 		    sizeof(iblob)) == -1)
1739 			return got_error_from_errno("imsg_compose BLOB");
1740 	}
1741 
1742 
1743 	return flush_imsg(ibuf);
1744 }
1745 
1746 const struct got_error *
1747 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1748     struct imsgbuf *ibuf)
1749 {
1750 	const struct got_error *err = NULL;
1751 	struct imsg imsg;
1752 	struct got_imsg_blob *iblob;
1753 	size_t datalen;
1754 
1755 	*outbuf = NULL;
1756 
1757 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1758 	if (err)
1759 		return err;
1760 
1761 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1762 
1763 	switch (imsg.hdr.type) {
1764 	case GOT_IMSG_BLOB:
1765 		if (datalen < sizeof(*iblob)) {
1766 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1767 			break;
1768 		}
1769 		iblob = imsg.data;
1770 		*size = iblob->size;
1771 		*hdrlen = iblob->hdrlen;
1772 
1773 		if (datalen == sizeof(*iblob)) {
1774 			/* Data has been written to file descriptor. */
1775 			break;
1776 		}
1777 
1778 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1779 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1780 			break;
1781 		}
1782 
1783 		*outbuf = malloc(*size);
1784 		if (*outbuf == NULL) {
1785 			err = got_error_from_errno("malloc");
1786 			break;
1787 		}
1788 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1789 		break;
1790 	default:
1791 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1792 		break;
1793 	}
1794 
1795 	imsg_free(&imsg);
1796 
1797 	return err;
1798 }
1799 
1800 static const struct got_error *
1801 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1802 {
1803 	const struct got_error *err = NULL;
1804 	size_t offset, remain;
1805 
1806 	offset = 0;
1807 	remain = tagmsg_len;
1808 	while (remain > 0) {
1809 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1810 
1811 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1812 		    tag->tagmsg + offset, n) == -1) {
1813 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1814 			break;
1815 		}
1816 
1817 		err = flush_imsg(ibuf);
1818 		if (err)
1819 			break;
1820 
1821 		offset += n;
1822 		remain -= n;
1823 	}
1824 
1825 	return err;
1826 }
1827 
1828 const struct got_error *
1829 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1830 {
1831 	const struct got_error *err = NULL;
1832 	struct got_imsg_tag_object *itag;
1833 	uint8_t *buf;
1834 	size_t len, total;
1835 	size_t tag_len = strlen(tag->tag);
1836 	size_t tagger_len = strlen(tag->tagger);
1837 	size_t tagmsg_len = strlen(tag->tagmsg);
1838 
1839 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1840 
1841 	buf = malloc(total);
1842 	if (buf == NULL)
1843 		return got_error_from_errno("malloc");
1844 
1845 	itag = (struct got_imsg_tag_object *)buf;
1846 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1847 	itag->obj_type = tag->obj_type;
1848 	itag->tag_len = tag_len;
1849 	itag->tagger_len = tagger_len;
1850 	itag->tagger_time = tag->tagger_time;
1851 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1852 	itag->tagmsg_len = tagmsg_len;
1853 
1854 	len = sizeof(*itag);
1855 	memcpy(buf + len, tag->tag, tag_len);
1856 	len += tag_len;
1857 	memcpy(buf + len, tag->tagger, tagger_len);
1858 	len += tagger_len;
1859 
1860 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1861 		err = got_error_from_errno("imsg_compose TAG");
1862 		goto done;
1863 	}
1864 
1865 	if (tagmsg_len == 0 ||
1866 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1867 		err = flush_imsg(ibuf);
1868 		if (err)
1869 			goto done;
1870 	}
1871 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1872 done:
1873 	free(buf);
1874 	return err;
1875 }
1876 
1877 const struct got_error *
1878 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1879 {
1880 	const struct got_error *err = NULL;
1881 	struct imsg imsg;
1882 	struct got_imsg_tag_object *itag;
1883 	size_t len, datalen;
1884 	const size_t min_datalen =
1885 	    MIN(sizeof(struct got_imsg_error),
1886 	    sizeof(struct got_imsg_tag_object));
1887 
1888 	*tag = NULL;
1889 
1890 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1891 	if (err)
1892 		return err;
1893 
1894 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1895 	len = 0;
1896 
1897 	switch (imsg.hdr.type) {
1898 	case GOT_IMSG_TAG:
1899 		if (datalen < sizeof(*itag)) {
1900 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1901 			break;
1902 		}
1903 		itag = imsg.data;
1904 		if (datalen != sizeof(*itag) + itag->tag_len +
1905 		    itag->tagger_len) {
1906 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1907 			break;
1908 		}
1909 		len += sizeof(*itag);
1910 
1911 		*tag = calloc(1, sizeof(**tag));
1912 		if (*tag == NULL) {
1913 			err = got_error_from_errno("calloc");
1914 			break;
1915 		}
1916 
1917 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1918 
1919 		if (itag->tag_len == 0) {
1920 			(*tag)->tag = strdup("");
1921 			if ((*tag)->tag == NULL) {
1922 				err = got_error_from_errno("strdup");
1923 				break;
1924 			}
1925 		} else {
1926 			(*tag)->tag = malloc(itag->tag_len + 1);
1927 			if ((*tag)->tag == NULL) {
1928 				err = got_error_from_errno("malloc");
1929 				break;
1930 			}
1931 			memcpy((*tag)->tag, imsg.data + len,
1932 			    itag->tag_len);
1933 			(*tag)->tag[itag->tag_len] = '\0';
1934 		}
1935 		len += itag->tag_len;
1936 
1937 		(*tag)->obj_type = itag->obj_type;
1938 		(*tag)->tagger_time = itag->tagger_time;
1939 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1940 
1941 		if (itag->tagger_len == 0) {
1942 			(*tag)->tagger = strdup("");
1943 			if ((*tag)->tagger == NULL) {
1944 				err = got_error_from_errno("strdup");
1945 				break;
1946 			}
1947 		} else {
1948 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1949 			if ((*tag)->tagger == NULL) {
1950 				err = got_error_from_errno("malloc");
1951 				break;
1952 			}
1953 			memcpy((*tag)->tagger, imsg.data + len,
1954 			    itag->tagger_len);
1955 			(*tag)->tagger[itag->tagger_len] = '\0';
1956 		}
1957 		len += itag->tagger_len;
1958 
1959 		if (itag->tagmsg_len == 0) {
1960 			(*tag)->tagmsg = strdup("");
1961 			if ((*tag)->tagmsg == NULL) {
1962 				err = got_error_from_errno("strdup");
1963 				break;
1964 			}
1965 		} else {
1966 			size_t offset = 0, remain = itag->tagmsg_len;
1967 
1968 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1969 			if ((*tag)->tagmsg == NULL) {
1970 				err = got_error_from_errno("malloc");
1971 				break;
1972 			}
1973 			while (remain > 0) {
1974 				struct imsg imsg_log;
1975 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1976 				    remain);
1977 
1978 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1979 				if (err)
1980 					return err;
1981 
1982 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1983 					return got_error(GOT_ERR_PRIVSEP_MSG);
1984 
1985 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1986 				    n);
1987 				imsg_free(&imsg_log);
1988 				offset += n;
1989 				remain -= n;
1990 			}
1991 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1992 		}
1993 
1994 		break;
1995 	default:
1996 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1997 		break;
1998 	}
1999 
2000 	imsg_free(&imsg);
2001 
2002 	return err;
2003 }
2004 
2005 const struct got_error *
2006 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
2007     struct got_packidx *packidx)
2008 {
2009 	const struct got_error *err = NULL;
2010 	struct got_imsg_packidx ipackidx;
2011 	struct got_imsg_pack ipack;
2012 	int fd;
2013 
2014 	ipackidx.len = packidx->len;
2015 	ipackidx.packfile_size = pack->filesize;
2016 	fd = dup(packidx->fd);
2017 	if (fd == -1)
2018 		return got_error_from_errno("dup");
2019 
2020 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
2021 	    sizeof(ipackidx)) == -1) {
2022 		err = got_error_from_errno("imsg_compose PACKIDX");
2023 		close(fd);
2024 		return err;
2025 	}
2026 
2027 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
2028 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
2029 		return got_error(GOT_ERR_NO_SPACE);
2030 	ipack.filesize = pack->filesize;
2031 
2032 	fd = dup(pack->fd);
2033 	if (fd == -1)
2034 		return got_error_from_errno("dup");
2035 
2036 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
2037 	    == -1) {
2038 		err = got_error_from_errno("imsg_compose PACK");
2039 		close(fd);
2040 		return err;
2041 	}
2042 
2043 	return flush_imsg(ibuf);
2044 }
2045 
2046 const struct got_error *
2047 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
2048     struct got_object_id *id)
2049 {
2050 	struct got_imsg_packed_object iobj;
2051 
2052 	iobj.idx = idx;
2053 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2054 
2055 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2056 	    &iobj, sizeof(iobj)) == -1)
2057 		return got_error_from_errno("imsg_compose "
2058 		    "PACKED_OBJECT_REQUEST");
2059 
2060 	return flush_imsg(ibuf);
2061 }
2062 
2063 const struct got_error *
2064 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2065     struct got_object_id *id)
2066 {
2067 	struct got_imsg_packed_object iobj;
2068 
2069 	iobj.idx = idx;
2070 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2071 
2072 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2073 	    &iobj, sizeof(iobj)) == -1)
2074 		return got_error_from_errno("imsg_compose "
2075 		    "PACKED_OBJECT_REQUEST");
2076 
2077 	return flush_imsg(ibuf);
2078 }
2079 
2080 const struct got_error *
2081 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2082 {
2083 	const struct got_error *err = NULL;
2084 
2085 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2086 	    NULL, 0) == -1) {
2087 		err = got_error_from_errno("imsg_compose "
2088 		    "GITCONFIG_PARSE_REQUEST");
2089 		close(fd);
2090 		return err;
2091 	}
2092 
2093 	return flush_imsg(ibuf);
2094 }
2095 
2096 const struct got_error *
2097 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2098 {
2099 	if (imsg_compose(ibuf,
2100 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2101 	    NULL, 0) == -1)
2102 		return got_error_from_errno("imsg_compose "
2103 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2104 
2105 	return flush_imsg(ibuf);
2106 }
2107 
2108 const struct got_error *
2109 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2110 {
2111 	if (imsg_compose(ibuf,
2112 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2113 	    NULL, 0) == -1)
2114 		return got_error_from_errno("imsg_compose "
2115 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2116 
2117 	return flush_imsg(ibuf);
2118 }
2119 
2120 
2121 const struct got_error *
2122 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2123 {
2124 	if (imsg_compose(ibuf,
2125 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2126 		return got_error_from_errno("imsg_compose "
2127 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2128 
2129 	return flush_imsg(ibuf);
2130 }
2131 
2132 const struct got_error *
2133 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2134 {
2135 	if (imsg_compose(ibuf,
2136 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2137 		return got_error_from_errno("imsg_compose "
2138 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2139 
2140 	return flush_imsg(ibuf);
2141 }
2142 
2143 const struct got_error *
2144 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2145 {
2146 	if (imsg_compose(ibuf,
2147 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2148 		return got_error_from_errno("imsg_compose "
2149 		    "GITCONFIG_REMOTE_REQUEST");
2150 
2151 	return flush_imsg(ibuf);
2152 }
2153 
2154 const struct got_error *
2155 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2156 {
2157 	if (imsg_compose(ibuf,
2158 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2159 		return got_error_from_errno("imsg_compose "
2160 		    "GITCONFIG_OWNER_REQUEST");
2161 
2162 	return flush_imsg(ibuf);
2163 }
2164 
2165 const struct got_error *
2166 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2167 {
2168 	const struct got_error *err = NULL;
2169 	struct imsg imsg;
2170 	size_t datalen;
2171 	const size_t min_datalen = 0;
2172 
2173 	*str = NULL;
2174 
2175 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2176 	if (err)
2177 		return err;
2178 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2179 
2180 	switch (imsg.hdr.type) {
2181 	case GOT_IMSG_GITCONFIG_STR_VAL:
2182 		if (datalen == 0)
2183 			break;
2184 		/* datalen does not include terminating \0 */
2185 		*str = malloc(datalen + 1);
2186 		if (*str == NULL) {
2187 			err = got_error_from_errno("malloc");
2188 			break;
2189 		}
2190 		memcpy(*str, imsg.data, datalen);
2191 		(*str)[datalen] = '\0';
2192 		break;
2193 	default:
2194 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2195 		break;
2196 	}
2197 
2198 	imsg_free(&imsg);
2199 	return err;
2200 }
2201 
2202 const struct got_error *
2203 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2204 {
2205 	const struct got_error *err = NULL;
2206 	struct imsg imsg;
2207 	size_t datalen;
2208 	const size_t min_datalen =
2209 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2210 
2211 	*val = 0;
2212 
2213 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2214 	if (err)
2215 		return err;
2216 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2217 
2218 	switch (imsg.hdr.type) {
2219 	case GOT_IMSG_GITCONFIG_INT_VAL:
2220 		if (datalen != sizeof(*val)) {
2221 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2222 			break;
2223 		}
2224 		memcpy(val, imsg.data, sizeof(*val));
2225 		break;
2226 	default:
2227 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2228 		break;
2229 	}
2230 
2231 	imsg_free(&imsg);
2232 	return err;
2233 }
2234 
2235 static void
2236 free_remote_data(struct got_remote_repo *remote)
2237 {
2238 	int i;
2239 
2240 	free(remote->name);
2241 	free(remote->fetch_url);
2242 	free(remote->send_url);
2243 	for (i = 0; i < remote->nfetch_branches; i++)
2244 		free(remote->fetch_branches[i]);
2245 	free(remote->fetch_branches);
2246 	for (i = 0; i < remote->nsend_branches; i++)
2247 		free(remote->send_branches[i]);
2248 	free(remote->send_branches);
2249 	for (i = 0; i < remote->nfetch_refs; i++)
2250 		free(remote->fetch_refs[i]);
2251 	free(remote->fetch_refs);
2252 }
2253 
2254 const struct got_error *
2255 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2256     int *nremotes, struct imsgbuf *ibuf)
2257 {
2258 	const struct got_error *err = NULL;
2259 	struct imsg imsg;
2260 	size_t datalen;
2261 	struct got_imsg_remotes iremotes;
2262 	struct got_imsg_remote iremote;
2263 
2264 	*remotes = NULL;
2265 	*nremotes = 0;
2266 	iremotes.nremotes = 0;
2267 
2268 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2269 	if (err)
2270 		return err;
2271 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2272 
2273 	switch (imsg.hdr.type) {
2274 	case GOT_IMSG_GITCONFIG_REMOTES:
2275 		if (datalen != sizeof(iremotes)) {
2276 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2277 			break;
2278 		}
2279 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2280 		if (iremotes.nremotes == 0) {
2281 			imsg_free(&imsg);
2282 			return NULL;
2283 		}
2284 		break;
2285 	default:
2286 		imsg_free(&imsg);
2287 		return got_error(GOT_ERR_PRIVSEP_MSG);
2288 	}
2289 
2290 	imsg_free(&imsg);
2291 
2292 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2293 	if (*remotes == NULL)
2294 		return got_error_from_errno("recallocarray");
2295 
2296 	while (*nremotes < iremotes.nremotes) {
2297 		struct got_remote_repo *remote;
2298 
2299 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2300 		if (err)
2301 			break;
2302 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2303 
2304 		switch (imsg.hdr.type) {
2305 		case GOT_IMSG_GITCONFIG_REMOTE:
2306 			remote = &(*remotes)[*nremotes];
2307 			memset(remote, 0, sizeof(*remote));
2308 			if (datalen < sizeof(iremote)) {
2309 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2310 				break;
2311 			}
2312 			memcpy(&iremote, imsg.data, sizeof(iremote));
2313 			if (iremote.name_len == 0 ||
2314 			    iremote.fetch_url_len == 0 ||
2315 			    iremote.send_url_len == 0 ||
2316 			    (sizeof(iremote) + iremote.name_len +
2317 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2318 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2319 				break;
2320 			}
2321 			remote->name = strndup(imsg.data + sizeof(iremote),
2322 			    iremote.name_len);
2323 			if (remote->name == NULL) {
2324 				err = got_error_from_errno("strndup");
2325 				break;
2326 			}
2327 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2328 			    iremote.name_len, iremote.fetch_url_len);
2329 			if (remote->fetch_url == NULL) {
2330 				err = got_error_from_errno("strndup");
2331 				free_remote_data(remote);
2332 				break;
2333 			}
2334 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2335 			    iremote.name_len + iremote.fetch_url_len,
2336 			    iremote.send_url_len);
2337 			if (remote->send_url == NULL) {
2338 				err = got_error_from_errno("strndup");
2339 				free_remote_data(remote);
2340 				break;
2341 			}
2342 			remote->mirror_references = iremote.mirror_references;
2343 			remote->fetch_all_branches = iremote.fetch_all_branches;
2344 			remote->nfetch_branches = 0;
2345 			remote->fetch_branches = NULL;
2346 			remote->nsend_branches = 0;
2347 			remote->send_branches = NULL;
2348 			remote->nfetch_refs = 0;
2349 			remote->fetch_refs = NULL;
2350 			(*nremotes)++;
2351 			break;
2352 		default:
2353 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2354 			break;
2355 		}
2356 
2357 		imsg_free(&imsg);
2358 		if (err)
2359 			break;
2360 	}
2361 
2362 	if (err) {
2363 		int i;
2364 		for (i = 0; i < *nremotes; i++)
2365 			free_remote_data(&(*remotes)[i]);
2366 		free(*remotes);
2367 		*remotes = NULL;
2368 		*nremotes = 0;
2369 	}
2370 	return err;
2371 }
2372 
2373 const struct got_error *
2374 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2375 {
2376 	const struct got_error *err = NULL;
2377 
2378 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2379 	    NULL, 0) == -1) {
2380 		err = got_error_from_errno("imsg_compose "
2381 		    "GOTCONFIG_PARSE_REQUEST");
2382 		close(fd);
2383 		return err;
2384 	}
2385 
2386 	return flush_imsg(ibuf);
2387 }
2388 
2389 const struct got_error *
2390 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2391 {
2392 	if (imsg_compose(ibuf,
2393 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2394 		return got_error_from_errno("imsg_compose "
2395 		    "GOTCONFIG_AUTHOR_REQUEST");
2396 
2397 	return flush_imsg(ibuf);
2398 }
2399 
2400 const struct got_error *
2401 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2402 {
2403 	if (imsg_compose(ibuf,
2404 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2405 		return got_error_from_errno("imsg_compose "
2406 		    "GOTCONFIG_REMOTE_REQUEST");
2407 
2408 	return flush_imsg(ibuf);
2409 }
2410 
2411 const struct got_error *
2412 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2413 {
2414 	const struct got_error *err = NULL;
2415 	struct imsg imsg;
2416 	size_t datalen;
2417 	const size_t min_datalen = 0;
2418 
2419 	*str = NULL;
2420 
2421 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2422 	if (err)
2423 		return err;
2424 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2425 
2426 	switch (imsg.hdr.type) {
2427 	case GOT_IMSG_ERROR:
2428 		if (datalen < sizeof(struct got_imsg_error)) {
2429 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2430 			break;
2431 		}
2432 		err = recv_imsg_error(&imsg, datalen);
2433 		break;
2434 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2435 		if (datalen == 0)
2436 			break;
2437 		/* datalen does not include terminating \0 */
2438 		*str = malloc(datalen + 1);
2439 		if (*str == NULL) {
2440 			err = got_error_from_errno("malloc");
2441 			break;
2442 		}
2443 		memcpy(*str, imsg.data, datalen);
2444 		(*str)[datalen] = '\0';
2445 		break;
2446 	default:
2447 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2448 		break;
2449 	}
2450 
2451 	imsg_free(&imsg);
2452 	return err;
2453 }
2454 
2455 const struct got_error *
2456 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2457     int *nremotes, struct imsgbuf *ibuf)
2458 {
2459 	const struct got_error *err = NULL;
2460 	struct imsg imsg;
2461 	size_t datalen;
2462 	struct got_imsg_remotes iremotes;
2463 	struct got_imsg_remote iremote;
2464 	const size_t min_datalen =
2465 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2466 
2467 	*remotes = NULL;
2468 	*nremotes = 0;
2469 	iremotes.nremotes = 0;
2470 
2471 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2472 	if (err)
2473 		return err;
2474 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2475 
2476 	switch (imsg.hdr.type) {
2477 	case GOT_IMSG_ERROR:
2478 		if (datalen < sizeof(struct got_imsg_error)) {
2479 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2480 			break;
2481 		}
2482 		err = recv_imsg_error(&imsg, datalen);
2483 		break;
2484 	case GOT_IMSG_GOTCONFIG_REMOTES:
2485 		if (datalen != sizeof(iremotes)) {
2486 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2487 			break;
2488 		}
2489 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2490 		if (iremotes.nremotes == 0) {
2491 			imsg_free(&imsg);
2492 			return NULL;
2493 		}
2494 		break;
2495 	default:
2496 		imsg_free(&imsg);
2497 		return got_error(GOT_ERR_PRIVSEP_MSG);
2498 	}
2499 
2500 	imsg_free(&imsg);
2501 
2502 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2503 	if (*remotes == NULL)
2504 		return got_error_from_errno("recallocarray");
2505 
2506 	while (*nremotes < iremotes.nremotes) {
2507 		struct got_remote_repo *remote;
2508 		const size_t min_datalen =
2509 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2510 		int i;
2511 
2512 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2513 		if (err)
2514 			break;
2515 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2516 
2517 		switch (imsg.hdr.type) {
2518 		case GOT_IMSG_ERROR:
2519 			if (datalen < sizeof(struct got_imsg_error)) {
2520 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2521 				break;
2522 			}
2523 			err = recv_imsg_error(&imsg, datalen);
2524 			break;
2525 		case GOT_IMSG_GOTCONFIG_REMOTE:
2526 			remote = &(*remotes)[*nremotes];
2527 			memset(remote, 0, sizeof(*remote));
2528 			if (datalen < sizeof(iremote)) {
2529 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2530 				break;
2531 			}
2532 			memcpy(&iremote, imsg.data, sizeof(iremote));
2533 			if (iremote.name_len == 0 ||
2534 			    (iremote.fetch_url_len == 0 &&
2535 			    iremote.send_url_len == 0) ||
2536 			    (sizeof(iremote) + iremote.name_len +
2537 			    iremote.fetch_url_len + iremote.send_url_len) >
2538 			    datalen) {
2539 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2540 				break;
2541 			}
2542 			remote->name = strndup(imsg.data + sizeof(iremote),
2543 			    iremote.name_len);
2544 			if (remote->name == NULL) {
2545 				err = got_error_from_errno("strndup");
2546 				break;
2547 			}
2548 			remote->fetch_url = strndup(imsg.data +
2549 			    sizeof(iremote) + iremote.name_len,
2550 			    iremote.fetch_url_len);
2551 			if (remote->fetch_url == NULL) {
2552 				err = got_error_from_errno("strndup");
2553 				free_remote_data(remote);
2554 				break;
2555 			}
2556 			remote->send_url = strndup(imsg.data +
2557 			    sizeof(iremote) + iremote.name_len +
2558 			    iremote.fetch_url_len, iremote.send_url_len);
2559 			if (remote->send_url == NULL) {
2560 				err = got_error_from_errno("strndup");
2561 				free_remote_data(remote);
2562 				break;
2563 			}
2564 			remote->mirror_references = iremote.mirror_references;
2565 			remote->fetch_all_branches = iremote.fetch_all_branches;
2566 			if (iremote.nfetch_branches > 0) {
2567 				remote->fetch_branches = recallocarray(NULL, 0,
2568 				    iremote.nfetch_branches, sizeof(char *));
2569 				if (remote->fetch_branches == NULL) {
2570 					err = got_error_from_errno("calloc");
2571 					free_remote_data(remote);
2572 					break;
2573 				}
2574 			}
2575 			remote->nfetch_branches = 0;
2576 			for (i = 0; i < iremote.nfetch_branches; i++) {
2577 				char *branch;
2578 				err = got_privsep_recv_gotconfig_str(&branch,
2579 				    ibuf);
2580 				if (err) {
2581 					free_remote_data(remote);
2582 					goto done;
2583 				}
2584 				remote->fetch_branches[i] = branch;
2585 				remote->nfetch_branches++;
2586 			}
2587 			if (iremote.nsend_branches > 0) {
2588 				remote->send_branches = recallocarray(NULL, 0,
2589 				    iremote.nsend_branches, sizeof(char *));
2590 				if (remote->send_branches == NULL) {
2591 					err = got_error_from_errno("calloc");
2592 					free_remote_data(remote);
2593 					break;
2594 				}
2595 			}
2596 			remote->nsend_branches = 0;
2597 			for (i = 0; i < iremote.nsend_branches; i++) {
2598 				char *branch;
2599 				err = got_privsep_recv_gotconfig_str(&branch,
2600 				    ibuf);
2601 				if (err) {
2602 					free_remote_data(remote);
2603 					goto done;
2604 				}
2605 				remote->send_branches[i] = branch;
2606 				remote->nsend_branches++;
2607 			}
2608 			if (iremote.nfetch_refs > 0) {
2609 				remote->fetch_refs = recallocarray(NULL, 0,
2610 				    iremote.nfetch_refs, sizeof(char *));
2611 				if (remote->fetch_refs == NULL) {
2612 					err = got_error_from_errno("calloc");
2613 					free_remote_data(remote);
2614 					break;
2615 				}
2616 			}
2617 			remote->nfetch_refs = 0;
2618 			for (i = 0; i < iremote.nfetch_refs; i++) {
2619 				char *ref;
2620 				err = got_privsep_recv_gotconfig_str(&ref,
2621 				    ibuf);
2622 				if (err) {
2623 					free_remote_data(remote);
2624 					goto done;
2625 				}
2626 				remote->fetch_refs[i] = ref;
2627 				remote->nfetch_refs++;
2628 			}
2629 			(*nremotes)++;
2630 			break;
2631 		default:
2632 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2633 			break;
2634 		}
2635 
2636 		imsg_free(&imsg);
2637 		if (err)
2638 			break;
2639 	}
2640 done:
2641 	if (err) {
2642 		int i;
2643 		for (i = 0; i < *nremotes; i++)
2644 			free_remote_data(&(*remotes)[i]);
2645 		free(*remotes);
2646 		*remotes = NULL;
2647 		*nremotes = 0;
2648 	}
2649 	return err;
2650 }
2651 
2652 const struct got_error *
2653 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2654     struct got_object_id *id, int idx, const char *path)
2655 {
2656 	struct ibuf *wbuf;
2657 	size_t path_len = strlen(path) + 1;
2658 
2659 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2660 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2661 	if (wbuf == NULL)
2662 		return got_error_from_errno(
2663 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2664 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2665 		return got_error_from_errno("imsg_add "
2666 		    "COMMIT_TRAVERSAL_REQUEST");
2667 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2668 		return got_error_from_errno("imsg_add "
2669 		    "COMMIT_TRAVERSAL_REQUEST");
2670 	if (imsg_add(wbuf, path, path_len) == -1)
2671 		return got_error_from_errno("imsg_add "
2672 		    "COMMIT_TRAVERSAL_REQUEST");
2673 
2674 	wbuf->fd = -1;
2675 	imsg_close(ibuf, wbuf);
2676 
2677 	return flush_imsg(ibuf);
2678 }
2679 
2680 const struct got_error *
2681 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2682     struct got_object_id **changed_commit_id,
2683     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2684 {
2685 	const struct got_error *err = NULL;
2686 	struct imsg imsg;
2687 	struct got_imsg_traversed_commits *icommits;
2688 	size_t datalen;
2689 	int i, done = 0;
2690 
2691 	*changed_commit = NULL;
2692 	*changed_commit_id = NULL;
2693 
2694 	while (!done) {
2695 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2696 		if (err)
2697 			return err;
2698 
2699 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2700 		switch (imsg.hdr.type) {
2701 		case GOT_IMSG_TRAVERSED_COMMITS:
2702 			icommits = imsg.data;
2703 			if (datalen != sizeof(*icommits) +
2704 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2705 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2706 				break;
2707 			}
2708 			for (i = 0; i < icommits->ncommits; i++) {
2709 				struct got_object_qid *qid;
2710 				uint8_t *sha1 = (uint8_t *)imsg.data +
2711 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2712 				err = got_object_qid_alloc_partial(&qid);
2713 				if (err)
2714 					break;
2715 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2716 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2717 
2718 				/* The last commit may contain a change. */
2719 				if (i == icommits->ncommits - 1) {
2720 					*changed_commit_id =
2721 					    got_object_id_dup(&qid->id);
2722 					if (*changed_commit_id == NULL) {
2723 						err = got_error_from_errno(
2724 						    "got_object_id_dup");
2725 						break;
2726 					}
2727 				}
2728 			}
2729 			break;
2730 		case GOT_IMSG_COMMIT:
2731 			if (*changed_commit_id == NULL) {
2732 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2733 				break;
2734 			}
2735 			err = get_commit_from_imsg(changed_commit, &imsg,
2736 			    datalen, ibuf);
2737 			break;
2738 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2739 			done = 1;
2740 			break;
2741 		default:
2742 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2743 			break;
2744 		}
2745 
2746 		imsg_free(&imsg);
2747 		if (err)
2748 			break;
2749 	}
2750 
2751 	if (err)
2752 		got_object_id_queue_free(commit_ids);
2753 	return err;
2754 }
2755 
2756 const struct got_error *
2757 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2758     struct got_object_id *tree_id, const char *path,
2759     struct got_parsed_tree_entry *entries, int nentries)
2760 {
2761 	const struct got_error *err = NULL;
2762 	struct ibuf *wbuf;
2763 	size_t path_len = strlen(path);
2764 	size_t msglen;
2765 
2766 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2767 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2768 	if (wbuf == NULL)
2769 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2770 
2771 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2772 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2773 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2774 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2775 	if (imsg_add(wbuf, path, path_len) == -1)
2776 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2777 
2778 	wbuf->fd = -1;
2779 	imsg_close(ibuf, wbuf);
2780 
2781 	if (entries) {
2782 		err = send_tree_entries(ibuf, entries, nentries);
2783 		if (err)
2784 			return err;
2785 	}
2786 
2787 	return flush_imsg(ibuf);
2788 }
2789 
2790 const struct got_error *
2791 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2792 {
2793 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2794 	    0, 0, -1, NULL, 0) == -1)
2795 		return got_error_from_errno("imsg_compose "
2796 		    "OBJECT_ENUMERATION_REQUEST");
2797 
2798 	return flush_imsg(ibuf);
2799 }
2800 
2801 const struct got_error *
2802 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2803 {
2804 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2805 	    0, 0, -1, NULL, 0) == -1)
2806 		return got_error_from_errno("imsg_compose "
2807 		    "OBJECT_ENUMERATION_DONE");
2808 
2809 	return flush_imsg(ibuf);
2810 }
2811 
2812 const struct got_error *
2813 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2814     struct got_object_id *id, time_t mtime)
2815 {
2816 	struct ibuf *wbuf;
2817 
2818 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2819 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2820 	if (wbuf == NULL)
2821 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2822 
2823 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2824 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2825 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2826 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2827 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2828 
2829 	wbuf->fd = -1;
2830 	imsg_close(ibuf, wbuf);
2831 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2832 	return NULL;
2833 }
2834 
2835 const struct got_error *
2836 got_privsep_recv_enumerated_objects(struct imsgbuf *ibuf,
2837     got_object_enumerate_commit_cb cb_commit,
2838     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2839     struct got_repository *repo)
2840 {
2841 	const struct got_error *err = NULL;
2842 	struct imsg imsg;
2843 	struct got_imsg_enumerated_commit *icommit = NULL;
2844 	struct got_object_id commit_id;
2845 	int have_commit = 0;
2846 	time_t mtime = 0;
2847 	struct got_tree_object tree;
2848 	struct got_imsg_enumerated_tree *itree;
2849 	struct got_object_id tree_id;
2850 	char *path = NULL, *canon_path = NULL;
2851 	size_t datalen, path_len;
2852 	int nentries = -1;
2853 	int done = 0;
2854 
2855 	memset(&tree, 0, sizeof(tree));
2856 
2857 	while (!done) {
2858 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2859 		if (err)
2860 			break;
2861 
2862 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2863 		switch (imsg.hdr.type) {
2864 		case GOT_IMSG_ENUMERATED_COMMIT: 
2865 			if (have_commit && nentries != -1) {
2866 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2867 				break;
2868 			}
2869 			if (datalen != sizeof(*icommit)) {
2870 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2871 				break;
2872 			}
2873 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2874 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2875 			mtime = icommit->mtime;
2876 			have_commit = 1;
2877 			break;
2878 		case GOT_IMSG_ENUMERATED_TREE:
2879 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2880 			if (!have_commit) {
2881 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2882 				break;
2883 			}
2884 			if (datalen < sizeof(*itree)) {
2885 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2886 				break;
2887 			}
2888 			itree = imsg.data;
2889 			path_len = datalen - sizeof(*itree);
2890 			if (path_len == 0) {
2891 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2892 				break;
2893 			}
2894 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2895 			free(path);
2896 			path = malloc(path_len + 1);
2897 			if (path == NULL) {
2898 				err = got_error_from_errno("malloc");
2899 				break;
2900 			}
2901 			free(canon_path);
2902 			canon_path = malloc(path_len + 1);
2903 			if (canon_path == NULL) {
2904 				err = got_error_from_errno("malloc");
2905 				break;
2906 			}
2907 			memcpy(path, (uint8_t *)imsg.data + sizeof(*itree),
2908 			    path_len);
2909 			path[path_len] = '\0';
2910 			if (!got_path_is_absolute(path)) {
2911 				err = got_error(GOT_ERR_BAD_PATH);
2912 				break;
2913 			}
2914 			if (got_path_is_root_dir(path)) {
2915 				/* XXX check what got_canonpath() does wrong */
2916 				canon_path[0] = '/';
2917 				canon_path[1] = '\0';
2918 			} else {
2919 				err = got_canonpath(path, canon_path,
2920 				    path_len + 1);
2921 				if (err)
2922 					break;
2923 			}
2924 			if (strcmp(path, canon_path) != 0) {
2925 				err = got_error(GOT_ERR_BAD_PATH);
2926 				break;
2927 			}
2928 			if (nentries != -1) {
2929 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2930 				break;
2931 			}
2932 			if (itree->nentries < -1) {
2933 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2934 				break;
2935 			}
2936 			if (itree->nentries == -1) {
2937 				/* Tree was not found in pack file. */
2938 				done = 1;
2939 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2940 				    path, repo);
2941 				break;
2942 			}
2943 			if (itree->nentries > INT_MAX) {
2944 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2945 				break;
2946 			}
2947 			tree.entries = calloc(itree->nentries,
2948 			    sizeof(struct got_tree_entry));
2949 			if (tree.entries == NULL) {
2950 				err = got_error_from_errno("calloc");
2951 				break;
2952 			}
2953 			if (itree->nentries == 0) {
2954 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2955 				    path, repo);
2956 				if (err)
2957 					break;
2958 
2959 				/* Prepare for next tree. */
2960 				free(tree.entries);
2961 				memset(&tree, 0, sizeof(tree));
2962 				nentries = -1;
2963 			} else {
2964 				tree.nentries = itree->nentries;
2965 				nentries = 0;
2966 			}
2967 			break;
2968 		case GOT_IMSG_TREE_ENTRIES:
2969 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2970 			if (nentries <= -1) {
2971 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2972 				break;
2973 			}
2974 			err = recv_tree_entries(imsg.data, datalen,
2975 			    &tree, &nentries);
2976 			if (err)
2977 				break;
2978 			if (tree.nentries == nentries) {
2979 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2980 				    path, repo);
2981 				if (err)
2982 					break;
2983 
2984 				/* Prepare for next tree. */
2985 				free(tree.entries);
2986 				memset(&tree, 0, sizeof(tree));
2987 				nentries = -1;
2988 			}
2989 			break;
2990 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2991 			/* All trees have been found and traversed. */
2992 			if (!have_commit || path == NULL || nentries != -1) {
2993 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2994 				break;
2995 			}
2996 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2997 			if (err)
2998 				break;
2999 			have_commit = 0;
3000 			break;
3001 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
3002 			done = 1;
3003 			break;
3004 		default:
3005 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3006 			break;
3007 		}
3008 
3009 		imsg_free(&imsg);
3010 		if (err)
3011 			break;
3012 	}
3013 
3014 	free(path);
3015 	free(canon_path);
3016 	free(tree.entries);
3017 	return err;
3018 }
3019 
3020 const struct got_error *
3021 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3022     struct got_object_id *id)
3023 {
3024 	struct got_imsg_raw_delta_request dreq;
3025 
3026 	dreq.idx = idx;
3027 	memcpy(dreq.id, id->sha1, SHA1_DIGEST_LENGTH);
3028 
3029 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3030 	    &dreq, sizeof(dreq)) == -1)
3031 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3032 
3033 	return flush_imsg(ibuf);
3034 }
3035 
3036 const struct got_error *
3037 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3038 {
3039 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3040 }
3041 
3042 const struct got_error *
3043 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3044     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3045     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3046 {
3047 	struct got_imsg_raw_delta idelta;
3048 	int ret;
3049 
3050 	idelta.base_size = base_size;
3051 	idelta.result_size = result_size;
3052 	idelta.delta_size = delta_size;
3053 	idelta.delta_compressed_size = delta_compressed_size;
3054 	idelta.delta_offset = delta_offset;
3055 	idelta.delta_out_offset = delta_out_offset;
3056 	memcpy(idelta.base_id, base_id->sha1, SHA1_DIGEST_LENGTH);
3057 
3058 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3059 	    &idelta, sizeof(idelta));
3060 	if (ret == -1)
3061 		return got_error_from_errno("imsg_compose RAW_DELTA");
3062 
3063 	return flush_imsg(ibuf);
3064 }
3065 
3066 const struct got_error *
3067 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3068     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3069     off_t *delta_out_offset, struct got_object_id **base_id, struct imsgbuf *ibuf)
3070 {
3071 	const struct got_error *err = NULL;
3072 	struct imsg imsg;
3073 	struct got_imsg_raw_delta *delta;
3074 	size_t datalen;
3075 
3076 	*base_size = 0;
3077 	*result_size = 0;
3078 	*delta_size = 0;
3079 	*delta_compressed_size = 0;
3080 	*delta_offset = 0;
3081 	*delta_out_offset = 0;
3082 	*base_id = NULL;
3083 
3084 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3085 	if (err)
3086 		return err;
3087 
3088 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3089 
3090 	switch (imsg.hdr.type) {
3091 	case GOT_IMSG_RAW_DELTA:
3092 		if (datalen != sizeof(*delta)) {
3093 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3094 			break;
3095 		}
3096 		delta = imsg.data;
3097 		*base_size = delta->base_size;
3098 		*result_size = delta->result_size;
3099 		*delta_size = delta->delta_size;
3100 		*delta_compressed_size = delta->delta_compressed_size;
3101 		*delta_offset = delta->delta_offset;
3102 		*delta_out_offset = delta->delta_out_offset;
3103 		*base_id = calloc(1, sizeof(**base_id));
3104 		if (*base_id == NULL) {
3105 			err = got_error_from_errno("malloc");
3106 			break;
3107 		}
3108 		memcpy((*base_id)->sha1, delta->base_id, SHA1_DIGEST_LENGTH);
3109 		break;
3110 	default:
3111 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3112 		break;
3113 	}
3114 
3115 	imsg_free(&imsg);
3116 
3117 	if (err) {
3118 		free(*base_id);
3119 		*base_id = NULL;
3120 	}
3121 	return err;
3122 }
3123 
3124 static const struct got_error *
3125 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3126 {
3127 	const struct got_error *err = NULL;
3128 	struct got_imsg_object_idlist idlist;
3129 	struct ibuf *wbuf;
3130 	size_t i;
3131 
3132 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3133 		return got_error(GOT_ERR_NO_SPACE);
3134 
3135 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3136 	    sizeof(idlist) + nids * sizeof(**ids));
3137 	if (wbuf == NULL) {
3138 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3139 		return err;
3140 	}
3141 
3142 	idlist.nids = nids;
3143 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3144 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3145 
3146 	for (i = 0; i < nids; i++) {
3147 		struct got_object_id *id = ids[i];
3148 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3149 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3150 	}
3151 	
3152 	wbuf->fd = -1;
3153 	imsg_close(ibuf, wbuf);
3154 
3155 	return flush_imsg(ibuf);
3156 }
3157 
3158 const struct got_error *
3159 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3160     struct got_object_id **ids, size_t nids)
3161 {
3162 	const struct got_error *err = NULL;
3163 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3164 	int i, j = 0;
3165 
3166 	for (i = 0; i < nids; i++) { 
3167 		j = i % nitems(idlist);
3168 		idlist[j] = ids[i];
3169 		if (j >= nitems(idlist) - 1) {
3170 			err = send_idlist(ibuf, idlist, j + 1);
3171 			if (err)
3172 				return err;
3173 			j = 0;
3174 		}
3175 	}
3176 
3177 	if (j > 0) {
3178 		err = send_idlist(ibuf, idlist, j + 1);
3179 		if (err)
3180 			return err;
3181 	}
3182 
3183 	return NULL;
3184 }
3185 
3186 const struct got_error *
3187 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3188 {
3189 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3190 	    == -1)
3191 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3192 
3193 	return flush_imsg(ibuf);
3194 }
3195 
3196 const struct got_error *
3197 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3198     size_t *nids, struct imsgbuf *ibuf)
3199 {
3200 	const struct got_error *err = NULL;
3201 	struct imsg imsg;
3202 	struct got_imsg_object_idlist *idlist;
3203 	size_t datalen;
3204 
3205 	*ids = NULL;
3206 	*done = 0;
3207 	*nids = 0;
3208 
3209 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3210 	if (err)
3211 		return err;
3212 
3213 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3214 	switch (imsg.hdr.type) {
3215 	case GOT_IMSG_OBJ_ID_LIST:
3216 		if (datalen < sizeof(*idlist)) {
3217 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3218 			break;
3219 		}
3220 		idlist = imsg.data;
3221 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
3222 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3223 			break;
3224 		}
3225 		*nids = idlist->nids;
3226 		*ids = calloc(*nids, sizeof(**ids));
3227 		if (*ids == NULL) {
3228 			err = got_error_from_errno("calloc");
3229 			break;
3230 		}
3231 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(idlist),
3232 		    *nids * sizeof(**ids));
3233 		break;
3234 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3235 		*done = 1;
3236 		break;
3237 	default:
3238 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3239 		break;
3240 	}
3241 
3242 	imsg_free(&imsg);
3243 
3244 	return err;
3245 }
3246 
3247 const struct got_error *
3248 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3249 {
3250 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3251 	    == -1)
3252 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3253 
3254 	return flush_imsg(ibuf);
3255 }
3256 
3257 const struct got_error *
3258 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3259     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3260 {
3261 	const struct got_error *err = NULL;
3262 	struct ibuf *wbuf;
3263 	struct got_imsg_reused_deltas ideltas;
3264 	size_t i;
3265 
3266 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3267 		return got_error(GOT_ERR_NO_SPACE);
3268 
3269 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3270 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3271 	if (wbuf == NULL) {
3272 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3273 		return err;
3274 	}
3275 
3276 	ideltas.ndeltas = ndeltas;
3277 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3278 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3279 
3280 	for (i = 0; i < ndeltas; i++) {
3281 		struct got_imsg_reused_delta *delta = &deltas[i];
3282 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3283 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3284 	}
3285 	
3286 	wbuf->fd = -1;
3287 	imsg_close(ibuf, wbuf);
3288 
3289 	return flush_imsg(ibuf);
3290 }
3291 
3292 const struct got_error *
3293 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3294 {
3295 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3296 	    == -1)
3297 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3298 
3299 	return flush_imsg(ibuf);
3300 }
3301 
3302 const struct got_error *
3303 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3304     size_t *ndeltas, struct imsgbuf *ibuf)
3305 {
3306 	const struct got_error *err = NULL;
3307 	struct imsg imsg;
3308 	struct got_imsg_reused_deltas *ideltas;
3309 	size_t datalen;
3310 
3311 	*done = 0;
3312 	*ndeltas = 0;
3313 
3314 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3315 	if (err)
3316 		return err;
3317 
3318 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3319 	switch (imsg.hdr.type) {
3320 	case GOT_IMSG_REUSED_DELTAS:
3321 		if (datalen < sizeof(*ideltas)) {
3322 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3323 			break;
3324 		}
3325 		ideltas = imsg.data;
3326 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
3327 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3328 			break;
3329 		}
3330 		*ndeltas = ideltas->ndeltas;
3331 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(ideltas),
3332 		    *ndeltas * sizeof(*deltas));
3333 		break;
3334 	case GOT_IMSG_DELTA_REUSE_DONE:
3335 		*done = 1;
3336 		break;
3337 	default:
3338 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3339 		break;
3340 	}
3341 
3342 	imsg_free(&imsg);
3343 
3344 	return err;
3345 }
3346 
3347 const struct got_error *
3348 got_privsep_unveil_exec_helpers(void)
3349 {
3350 	const char *helpers[] = {
3351 	    GOT_PATH_PROG_READ_PACK,
3352 	    GOT_PATH_PROG_READ_OBJECT,
3353 	    GOT_PATH_PROG_READ_COMMIT,
3354 	    GOT_PATH_PROG_READ_TREE,
3355 	    GOT_PATH_PROG_READ_BLOB,
3356 	    GOT_PATH_PROG_READ_TAG,
3357 	    GOT_PATH_PROG_READ_GITCONFIG,
3358 	    GOT_PATH_PROG_READ_GOTCONFIG,
3359 	    GOT_PATH_PROG_READ_PATCH,
3360 	    GOT_PATH_PROG_FETCH_PACK,
3361 	    GOT_PATH_PROG_INDEX_PACK,
3362 	    GOT_PATH_PROG_SEND_PACK,
3363 	};
3364 	size_t i;
3365 
3366 	for (i = 0; i < nitems(helpers); i++) {
3367 		if (unveil(helpers[i], "x") == 0)
3368 			continue;
3369 		return got_error_from_errno2("unveil", helpers[i]);
3370 	}
3371 
3372 	return NULL;
3373 }
3374 
3375 void
3376 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3377 {
3378 	if (close(imsg_fds[0]) == -1) {
3379 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3380 		_exit(1);
3381 	}
3382 
3383 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3384 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3385 		_exit(1);
3386 	}
3387 
3388 	closefrom(GOT_IMSG_FD_CHILD + 1);
3389 
3390 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3391 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3392 		    strerror(errno));
3393 		_exit(1);
3394 	}
3395 }