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Date:: Sat Feb 4 14:01:14 2023 UTC
Message:: stuff to get `got log -p' working
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <sha2.h>
35 #include <unistd.h>
36 #include <zlib.h>
37 
38 #include "got_object.h"
39 #include "got_error.h"
40 #include "got_path.h"
41 #include "got_repository.h"
42 
43 #include "got_lib_hash.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
50 #include "got_lib_poll.h"
51 
52 #include "got_privsep.h"
53 
54 #ifndef MIN
55 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
56 #endif
57 
58 #ifndef nitems
59 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
60 #endif
61 
62 static const struct got_error *
63 read_imsg(struct imsgbuf *ibuf)
64 {
65 	const struct got_error *err;
66 	size_t n;
67 
68 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
69 	if (err) {
70 		if (err->code == GOT_ERR_EOF)
71 			return got_error(GOT_ERR_PRIVSEP_PIPE);
72 		return err;
73 	}
74 
75 	n = imsg_read(ibuf);
76 	if (n == -1) {
77 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
78 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
79 		return got_error(GOT_ERR_PRIVSEP_READ);
80 	}
81 	if (n == 0)
82 		return got_error(GOT_ERR_PRIVSEP_PIPE);
83 
84 	return NULL;
85 }
86 
87 const struct got_error *
88 got_privsep_wait_for_child(pid_t pid)
89 {
90 	int child_status;
91 
92 	if (waitpid(pid, &child_status, 0) == -1)
93 		return got_error_from_errno("waitpid");
94 
95 	if (!WIFEXITED(child_status))
96 		return got_error(GOT_ERR_PRIVSEP_DIED);
97 
98 	if (WEXITSTATUS(child_status) != 0)
99 		return got_error(GOT_ERR_PRIVSEP_EXIT);
100 
101 	return NULL;
102 }
103 
104 static const struct got_error *
105 recv_imsg_error(struct imsg *imsg, size_t datalen)
106 {
107 	struct got_imsg_error *ierr;
108 
109 	if (datalen != sizeof(*ierr))
110 		return got_error(GOT_ERR_PRIVSEP_LEN);
111 
112 	ierr = imsg->data;
113 	if (ierr->code == GOT_ERR_ERRNO) {
114 		static struct got_error serr;
115 		serr.code = GOT_ERR_ERRNO;
116 		serr.msg = strerror(ierr->errno_code);
117 		return &serr;
118 	}
119 
120 	return got_error(ierr->code);
121 }
122 
123 const struct got_error *
124 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
125     size_t min_datalen)
126 {
127 	const struct got_error *err;
128 	ssize_t n;
129 
130 	n = imsg_get(ibuf, imsg);
131 	if (n == -1)
132 		return got_error_from_errno("imsg_get");
133 
134 	while (n == 0) {
135 		err = read_imsg(ibuf);
136 		if (err)
137 			return err;
138 		n = imsg_get(ibuf, imsg);
139 		if (n == -1)
140 			return got_error_from_errno("imsg_get");
141 	}
142 
143 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
144 		return got_error(GOT_ERR_PRIVSEP_LEN);
145 
146 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
147 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
148 		return recv_imsg_error(imsg, datalen);
149 	}
150 
151 	return NULL;
152 }
153 
154 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
155 void
156 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
157 {
158 	const struct got_error *poll_err;
159 	struct got_imsg_error ierr;
160 	int ret;
161 
162 	ierr.code = err->code;
163 	if (err->code == GOT_ERR_ERRNO)
164 		ierr.errno_code = errno;
165 	else
166 		ierr.errno_code = 0;
167 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
168 	if (ret == -1) {
169 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
170 		    getprogname(), err->code, err->msg, strerror(errno));
171 		return;
172 	}
173 
174 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
175 	if (poll_err) {
176 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
177 		    getprogname(), err->code, err->msg, poll_err->msg);
178 		return;
179 	}
180 
181 	ret = imsg_flush(ibuf);
182 	if (ret == -1) {
183 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
184 		    getprogname(), err->code, err->msg, strerror(errno));
185 		imsg_clear(ibuf);
186 		return;
187 	}
188 }
189 
190 static const struct got_error *
191 flush_imsg(struct imsgbuf *ibuf)
192 {
193 	const struct got_error *err;
194 
195 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
196 	if (err)
197 		return err;
198 
199 	if (imsg_flush(ibuf) == -1) {
200 		imsg_clear(ibuf);
201 		return got_error_from_errno("imsg_flush");
202 	}
203 
204 	return NULL;
205 }
206 
207 const struct got_error *
208 got_privsep_flush_imsg(struct imsgbuf *ibuf)
209 {
210 	return flush_imsg(ibuf);
211 }
212 
213 const struct got_error *
214 got_privsep_send_stop(int fd)
215 {
216 	const struct got_error *err = NULL;
217 	struct imsgbuf ibuf;
218 
219 	imsg_init(&ibuf, fd);
220 
221 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
222 		return got_error_from_errno("imsg_compose STOP");
223 
224 	err = flush_imsg(&ibuf);
225 	return err;
226 }
227 
228 const struct got_error *
229 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
230     struct got_object_id *id)
231 {
232 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
233 	    id, sizeof(*id)) == -1)
234 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
235 
236 	return flush_imsg(ibuf);
237 }
238 
239 const struct got_error *
240 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
241     struct got_object_id *id)
242 {
243 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
244 	    id, sizeof(*id)) == -1)
245 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
246 
247 	return flush_imsg(ibuf);
248 }
249 
250 const struct got_error *
251 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
252 {
253 	const struct got_error *err = NULL;
254 
255 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
256 	    == -1) {
257 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
258 		close(outfd);
259 		return err;
260 	}
261 
262 	return flush_imsg(ibuf);
263 }
264 
265 const struct got_error *
266 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
267     uint8_t *data)
268 {
269 	const struct got_error *err = NULL;
270 	struct got_imsg_raw_obj iobj;
271 	size_t len = sizeof(iobj);
272 	struct ibuf *wbuf;
273 
274 	memset(&iobj, 0, sizeof(iobj));
275 	iobj.hdrlen = hdrlen;
276 	iobj.size = size;
277 
278 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
279 		len += (size_t)size + hdrlen;
280 
281 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
282 	if (wbuf == NULL) {
283 		err = got_error_from_errno("imsg_create RAW_OBJECT");
284 		return err;
285 	}
286 
287 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
288 		return got_error_from_errno("imsg_add RAW_OBJECT");
289 
290 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
291 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
292 			return got_error_from_errno("imsg_add RAW_OBJECT");
293 	}
294 
295 	wbuf->fd = -1;
296 	imsg_close(ibuf, wbuf);
297 
298 	return flush_imsg(ibuf);
299 }
300 
301 const struct got_error *
302 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
303     struct imsgbuf *ibuf)
304 {
305 	const struct got_error *err = NULL;
306 	struct imsg imsg;
307 	struct got_imsg_raw_obj *iobj;
308 	size_t datalen;
309 
310 	*outbuf = NULL;
311 
312 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
313 	if (err)
314 		return err;
315 
316 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
317 
318 	switch (imsg.hdr.type) {
319 	case GOT_IMSG_RAW_OBJECT:
320 		if (datalen < sizeof(*iobj)) {
321 			err = got_error(GOT_ERR_PRIVSEP_LEN);
322 			break;
323 		}
324 		iobj = imsg.data;
325 		*size = iobj->size;
326 		*hdrlen = iobj->hdrlen;
327 
328 		if (datalen == sizeof(*iobj)) {
329 			/* Data has been written to file descriptor. */
330 			break;
331 		}
332 
333 		if (*size < 0 ||
334 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
335 			err = got_error(GOT_ERR_PRIVSEP_LEN);
336 			break;
337 		}
338 
339 		*outbuf = malloc(*size + *hdrlen);
340 		if (*outbuf == NULL) {
341 			err = got_error_from_errno("malloc");
342 			break;
343 		}
344 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
345 		break;
346 	default:
347 		err = got_error(GOT_ERR_PRIVSEP_MSG);
348 		break;
349 	}
350 
351 	imsg_free(&imsg);
352 
353 	return err;
354 }
355 
356 const struct got_error *
357 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
358     struct got_object_id *id, int pack_idx)
359 {
360 	const struct got_error *err = NULL;
361 	struct got_imsg_packed_object iobj;
362 	void *data;
363 	size_t len;
364 
365 	memset(&iobj, 0, sizeof(iobj));
366 	if (pack_idx != -1) { /* commit is packed */
367 		iobj.idx = pack_idx;
368 		memcpy(&iobj.id, id, sizeof(iobj.id));
369 		data = &iobj;
370 		len = sizeof(iobj);
371 	} else {
372 		data = id;
373 		len = sizeof(*id);
374 	}
375 
376 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
377 	    == -1) {
378 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
379 		close(fd);
380 		return err;
381 	}
382 
383 	return flush_imsg(ibuf);
384 }
385 
386 const struct got_error *
387 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
388     struct got_object_id *id, int pack_idx)
389 {
390 	struct ibuf *wbuf;
391 	size_t len;
392 
393 	if (pack_idx != -1)
394 		len = sizeof(struct got_imsg_packed_object);
395 	else
396 		len = sizeof(*id);
397 
398 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
399 	if (wbuf == NULL)
400 		return got_error_from_errno("imsg_create TREE_REQUEST");
401 
402 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
403 		return got_error_from_errno("imsg_add TREE_REQUEST");
404 
405 	if (pack_idx != -1) { /* tree is packed */
406 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
407 			return got_error_from_errno("imsg_add TREE_REQUEST");
408 	}
409 
410 	wbuf->fd = fd;
411 	imsg_close(ibuf, wbuf);
412 
413 	return flush_imsg(ibuf);
414 }
415 
416 const struct got_error *
417 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
418     struct got_object_id *id, int pack_idx)
419 {
420 	struct got_imsg_packed_object iobj;
421 	void *data;
422 	size_t len;
423 
424 	memset(&iobj, 0, sizeof(iobj));
425 	if (pack_idx != -1) { /* tag is packed */
426 		iobj.idx = pack_idx;
427 		memcpy(&iobj.id, id, sizeof(iobj.id));
428 		data = &iobj;
429 		len = sizeof(iobj);
430 	} else {
431 		data = id;
432 		len = sizeof(*id);
433 	}
434 
435 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
436 	    == -1)
437 		return got_error_from_errno("imsg_compose TAG_REQUEST");
438 
439 	return flush_imsg(ibuf);
440 }
441 
442 const struct got_error *
443 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
444     struct got_object_id *id, int pack_idx)
445 {
446 	const struct got_error *err = NULL;
447 	struct got_imsg_packed_object iobj;
448 	void *data;
449 	size_t len;
450 
451 	memset(&iobj, 0, sizeof(iobj));
452 	if (pack_idx != -1) { /* blob is packed */
453 		iobj.idx = pack_idx;
454 		memcpy(&iobj.id, id, sizeof(iobj.id));
455 		data = &iobj;
456 		len = sizeof(iobj);
457 	} else {
458 		data = id;
459 		len = sizeof(*id);
460 	}
461 
462 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
463 	    == -1) {
464 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
465 		close(infd);
466 		return err;
467 	}
468 
469 	return flush_imsg(ibuf);
470 }
471 
472 const struct got_error *
473 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
474 {
475 	const struct got_error *err = NULL;
476 
477 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
478 	    == -1) {
479 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
480 		close(outfd);
481 		return err;
482 	}
483 
484 	return flush_imsg(ibuf);
485 }
486 
487 static const struct got_error *
488 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
489 {
490 	const struct got_error *err = NULL;
491 
492 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
493 		err = got_error_from_errno("imsg_compose TMPFD");
494 		close(fd);
495 		return err;
496 	}
497 
498 	return flush_imsg(ibuf);
499 }
500 
501 const struct got_error *
502 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
503 {
504 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
505 }
506 
507 const struct got_error *
508 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
509 {
510 	struct got_imsg_object iobj;
511 
512 	memset(&iobj, 0, sizeof(iobj));
513 
514 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
515 	iobj.type = obj->type;
516 	iobj.flags = obj->flags;
517 	iobj.hdrlen = obj->hdrlen;
518 	iobj.size = obj->size;
519 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
520 		iobj.pack_offset = obj->pack_offset;
521 		iobj.pack_idx = obj->pack_idx;
522 	}
523 
524 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
525 	    == -1)
526 		return got_error_from_errno("imsg_compose OBJECT");
527 
528 	return flush_imsg(ibuf);
529 }
530 
531 const struct got_error *
532 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
533     struct got_pathlist_head *have_refs, int fetch_all_branches,
534     struct got_pathlist_head *wanted_branches,
535     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
536 {
537 	const struct got_error *err = NULL;
538 	struct ibuf *wbuf;
539 	size_t len;
540 	struct got_pathlist_entry *pe;
541 	struct got_imsg_fetch_request fetchreq;
542 
543 	memset(&fetchreq, 0, sizeof(fetchreq));
544 	fetchreq.fetch_all_branches = fetch_all_branches;
545 	fetchreq.list_refs_only = list_refs_only;
546 	fetchreq.verbosity = verbosity;
547 	TAILQ_FOREACH(pe, have_refs, entry)
548 		fetchreq.n_have_refs++;
549 	TAILQ_FOREACH(pe, wanted_branches, entry)
550 		fetchreq.n_wanted_branches++;
551 	TAILQ_FOREACH(pe, wanted_refs, entry)
552 		fetchreq.n_wanted_refs++;
553 	len = sizeof(struct got_imsg_fetch_request);
554 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
555 		close(fd);
556 		return got_error(GOT_ERR_NO_SPACE);
557 	}
558 
559 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
560 	    &fetchreq, sizeof(fetchreq)) == -1)
561 		return got_error_from_errno(
562 		    "imsg_compose FETCH_SERVER_PROGRESS");
563 
564 	err = flush_imsg(ibuf);
565 	if (err) {
566 		close(fd);
567 		return err;
568 	}
569 	fd = -1;
570 
571 	TAILQ_FOREACH(pe, have_refs, entry) {
572 		const char *name = pe->path;
573 		size_t name_len = pe->path_len;
574 		struct got_object_id *id = pe->data;
575 
576 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
577 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
578 		if (wbuf == NULL)
579 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
580 
581 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
582 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
583 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
584 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
585 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
586 		if (imsg_add(wbuf, name, name_len) == -1)
587 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
588 
589 		wbuf->fd = -1;
590 		imsg_close(ibuf, wbuf);
591 		err = flush_imsg(ibuf);
592 		if (err)
593 			return err;
594 	}
595 
596 	TAILQ_FOREACH(pe, wanted_branches, entry) {
597 		const char *name = pe->path;
598 		size_t name_len = pe->path_len;
599 
600 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
601 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
602 		    len);
603 		if (wbuf == NULL)
604 			return got_error_from_errno(
605 			    "imsg_create FETCH_WANTED_BRANCH");
606 
607 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
608 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
609 			return got_error_from_errno(
610 			    "imsg_add FETCH_WANTED_BRANCH");
611 		if (imsg_add(wbuf, name, name_len) == -1)
612 			return got_error_from_errno(
613 			    "imsg_add FETCH_WANTED_BRANCH");
614 
615 		wbuf->fd = -1;
616 		imsg_close(ibuf, wbuf);
617 		err = flush_imsg(ibuf);
618 		if (err)
619 			return err;
620 	}
621 
622 	TAILQ_FOREACH(pe, wanted_refs, entry) {
623 		const char *name = pe->path;
624 		size_t name_len = pe->path_len;
625 
626 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
627 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
628 		    len);
629 		if (wbuf == NULL)
630 			return got_error_from_errno(
631 			    "imsg_create FETCH_WANTED_REF");
632 
633 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
634 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
635 			return got_error_from_errno(
636 			    "imsg_add FETCH_WANTED_REF");
637 		if (imsg_add(wbuf, name, name_len) == -1)
638 			return got_error_from_errno(
639 			    "imsg_add FETCH_WANTED_REF");
640 
641 		wbuf->fd = -1;
642 		imsg_close(ibuf, wbuf);
643 		err = flush_imsg(ibuf);
644 		if (err)
645 			return err;
646 	}
647 
648 
649 	return NULL;
650 
651 }
652 
653 const struct got_error *
654 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
655 {
656 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
657 }
658 
659 const struct got_error *
660 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
661     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
662     off_t *packfile_size, uint8_t *pack_hash, struct imsgbuf *ibuf)
663 {
664 	const struct got_error *err = NULL;
665 	struct imsg imsg;
666 	size_t datalen;
667 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
668 	size_t n, remain;
669 	off_t off;
670 	int i;
671 
672 	*done = 0;
673 	*id = NULL;
674 	*refname = NULL;
675 	*server_progress = NULL;
676 	*packfile_size = 0;
677 	memset(pack_hash, 0, SHA1_DIGEST_LENGTH);
678 
679 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
680 	if (err)
681 		return err;
682 
683 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
684 	switch (imsg.hdr.type) {
685 	case GOT_IMSG_FETCH_SYMREFS:
686 		if (datalen < sizeof(*isymrefs)) {
687 			err = got_error(GOT_ERR_PRIVSEP_LEN);
688 			break;
689 		}
690 		if (isymrefs != NULL) {
691 			err = got_error(GOT_ERR_PRIVSEP_MSG);
692 			break;
693 		}
694 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
695 		off = sizeof(*isymrefs);
696 		remain = datalen - off;
697 		for (n = 0; n < isymrefs->nsymrefs; n++) {
698 			struct got_imsg_fetch_symref *s;
699 			char *name, *target;
700 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
701 				err = got_error(GOT_ERR_PRIVSEP_LEN);
702 				goto done;
703 			}
704 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
705 			off += sizeof(*s);
706 			remain -= sizeof(*s);
707 			if (remain < s->name_len) {
708 				err = got_error(GOT_ERR_PRIVSEP_LEN);
709 				goto done;
710 			}
711 			name = strndup(imsg.data + off, s->name_len);
712 			if (name == NULL) {
713 				err = got_error_from_errno("strndup");
714 				goto done;
715 			}
716 			off += s->name_len;
717 			remain -= s->name_len;
718 			if (remain < s->target_len) {
719 				err = got_error(GOT_ERR_PRIVSEP_LEN);
720 				free(name);
721 				goto done;
722 			}
723 			target = strndup(imsg.data + off, s->target_len);
724 			if (target == NULL) {
725 				err = got_error_from_errno("strndup");
726 				free(name);
727 				goto done;
728 			}
729 			off += s->target_len;
730 			remain -= s->target_len;
731 			err = got_pathlist_append(symrefs, name, target);
732 			if (err) {
733 				free(name);
734 				free(target);
735 				goto done;
736 			}
737 		}
738 		break;
739 	case GOT_IMSG_FETCH_REF:
740 		if (datalen <= sizeof(**id)) {
741 			err = got_error(GOT_ERR_PRIVSEP_MSG);
742 			break;
743 		}
744 		*id = malloc(sizeof(**id));
745 		if (*id == NULL) {
746 			err = got_error_from_errno("malloc");
747 			break;
748 		}
749 		memcpy(*id, imsg.data, sizeof(**id));
750 		*refname = strndup(imsg.data + sizeof(**id),
751 		    datalen - sizeof(**id));
752 		if (*refname == NULL) {
753 			err = got_error_from_errno("strndup");
754 			break;
755 		}
756 		break;
757 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
758 		if (datalen == 0) {
759 			err = got_error(GOT_ERR_PRIVSEP_LEN);
760 			break;
761 		}
762 		*server_progress = strndup(imsg.data, datalen);
763 		if (*server_progress == NULL) {
764 			err = got_error_from_errno("strndup");
765 			break;
766 		}
767 		for (i = 0; i < datalen; i++) {
768 			if (!isprint((unsigned char)(*server_progress)[i]) &&
769 			    !isspace((unsigned char)(*server_progress)[i])) {
770 				err = got_error(GOT_ERR_PRIVSEP_MSG);
771 				free(*server_progress);
772 				*server_progress = NULL;
773 				goto done;
774 			}
775 		}
776 		break;
777 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
778 		if (datalen < sizeof(*packfile_size)) {
779 			err = got_error(GOT_ERR_PRIVSEP_MSG);
780 			break;
781 		}
782 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
783 		break;
784 	case GOT_IMSG_FETCH_DONE:
785 		if (datalen != SHA1_DIGEST_LENGTH) {
786 			err = got_error(GOT_ERR_PRIVSEP_MSG);
787 			break;
788 		}
789 		memcpy(pack_hash, imsg.data, SHA1_DIGEST_LENGTH);
790 		*done = 1;
791 		break;
792 	default:
793 		err = got_error(GOT_ERR_PRIVSEP_MSG);
794 		break;
795 	}
796 done:
797 	if (err) {
798 		free(*id);
799 		*id = NULL;
800 		free(*refname);
801 		*refname = NULL;
802 	}
803 	imsg_free(&imsg);
804 	return err;
805 }
806 
807 static const struct got_error *
808 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
809     int delete, struct imsgbuf *ibuf)
810 {
811 	size_t len;
812 	struct ibuf *wbuf;
813 
814 	len = sizeof(struct got_imsg_send_ref) + name_len;
815 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
816 	if (wbuf == NULL)
817 		return got_error_from_errno("imsg_create SEND_REF");
818 
819 	/* Keep in sync with struct got_imsg_send_ref! */
820 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
821 		return got_error_from_errno("imsg_add SEND_REF");
822 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
823 		return got_error_from_errno("imsg_add SEND_REF");
824 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
825 		return got_error_from_errno("imsg_add SEND_REF");
826 	if (imsg_add(wbuf, name, name_len) == -1)
827 		return got_error_from_errno("imsg_add SEND_REF");
828 
829 	wbuf->fd = -1;
830 	imsg_close(ibuf, wbuf);
831 	return flush_imsg(ibuf);
832 }
833 
834 const struct got_error *
835 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
836     struct got_pathlist_head *have_refs,
837     struct got_pathlist_head *delete_refs,
838     int verbosity)
839 {
840 	const struct got_error *err = NULL;
841 	struct got_pathlist_entry *pe;
842 	struct got_imsg_send_request sendreq;
843 	struct got_object_id zero_id;
844 
845 	memset(&zero_id, 0, sizeof(zero_id));
846 	memset(&sendreq, 0, sizeof(sendreq));
847 	sendreq.verbosity = verbosity;
848 	TAILQ_FOREACH(pe, have_refs, entry)
849 		sendreq.nrefs++;
850 	TAILQ_FOREACH(pe, delete_refs, entry)
851 		sendreq.nrefs++;
852 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
853 	    &sendreq, sizeof(sendreq)) == -1) {
854 		err = got_error_from_errno(
855 		    "imsg_compose FETCH_SERVER_PROGRESS");
856 		goto done;
857 	}
858 
859 	err = flush_imsg(ibuf);
860 	if (err)
861 		goto done;
862 	fd = -1;
863 
864 	TAILQ_FOREACH(pe, have_refs, entry) {
865 		const char *name = pe->path;
866 		size_t name_len = pe->path_len;
867 		struct got_object_id *id = pe->data;
868 		err = send_send_ref(name, name_len, id, 0, ibuf);
869 		if (err)
870 			goto done;
871 	}
872 
873 	TAILQ_FOREACH(pe, delete_refs, entry) {
874 		const char *name = pe->path;
875 		size_t name_len = pe->path_len;
876 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
877 		if (err)
878 			goto done;
879 	}
880 done:
881 	if (fd != -1 && close(fd) == -1 && err == NULL)
882 		err = got_error_from_errno("close");
883 	return err;
884 
885 }
886 
887 const struct got_error *
888 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
889     struct imsgbuf *ibuf)
890 {
891 	const struct got_error *err = NULL;
892 	struct imsg imsg;
893 	size_t datalen;
894 	int done = 0;
895 	struct got_imsg_send_remote_ref iremote_ref;
896 	struct got_object_id *id = NULL;
897 	char *refname = NULL;
898 	struct got_pathlist_entry *new;
899 
900 	while (!done) {
901 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
902 		if (err)
903 			return err;
904 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
905 		switch (imsg.hdr.type) {
906 		case GOT_IMSG_SEND_REMOTE_REF:
907 			if (datalen < sizeof(iremote_ref)) {
908 				err = got_error(GOT_ERR_PRIVSEP_MSG);
909 				goto done;
910 			}
911 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
912 			if (datalen != sizeof(iremote_ref) +
913 			    iremote_ref.name_len) {
914 				err = got_error(GOT_ERR_PRIVSEP_MSG);
915 				goto done;
916 			}
917 			id = malloc(sizeof(*id));
918 			if (id == NULL) {
919 				err = got_error_from_errno("malloc");
920 				goto done;
921 			}
922 			memcpy(id, &iremote_ref.id, sizeof(*id));
923 			refname = strndup(imsg.data + sizeof(iremote_ref),
924 			    datalen - sizeof(iremote_ref));
925 			if (refname == NULL) {
926 				err = got_error_from_errno("strndup");
927 				goto done;
928 			}
929 			err = got_pathlist_insert(&new, remote_refs,
930 			    refname, id);
931 			if (err)
932 				goto done;
933 			if (new == NULL) { /* duplicate which wasn't inserted */
934 				free(id);
935 				free(refname);
936 			}
937 			id = NULL;
938 			refname = NULL;
939 			break;
940 		case GOT_IMSG_SEND_PACK_REQUEST:
941 			if (datalen != 0) {
942 				err = got_error(GOT_ERR_PRIVSEP_MSG);
943 				goto done;
944 			}
945 			/* got-send-pack is now waiting for a pack file. */
946 			done = 1;
947 			break;
948 		default:
949 			err = got_error(GOT_ERR_PRIVSEP_MSG);
950 			break;
951 		}
952 	}
953 done:
954 	free(id);
955 	free(refname);
956 	imsg_free(&imsg);
957 	return err;
958 }
959 
960 const struct got_error *
961 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
962 {
963 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
964 }
965 
966 const struct got_error *
967 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
968     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
969 {
970 	const struct got_error *err = NULL;
971 	struct imsg imsg;
972 	size_t datalen;
973 	struct got_imsg_send_ref_status iref_status;
974 
975 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
976 	*done = 0;
977 	*success = 0;
978 	*refname = NULL;
979 	*errmsg = NULL;
980 
981 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
982 	if (err)
983 		return err;
984 
985 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
986 	switch (imsg.hdr.type) {
987 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
988 		if (datalen < sizeof(*bytes_sent)) {
989 			err = got_error(GOT_ERR_PRIVSEP_MSG);
990 			break;
991 		}
992 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
993 		break;
994 	case GOT_IMSG_SEND_REF_STATUS:
995 		if (datalen < sizeof(iref_status)) {
996 			err = got_error(GOT_ERR_PRIVSEP_MSG);
997 			break;
998 		}
999 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1000 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1001 		    iref_status.errmsg_len) {
1002 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1003 			break;
1004 		}
1005 		*success = iref_status.success;
1006 		*refname = strndup(imsg.data + sizeof(iref_status),
1007 		    iref_status.name_len);
1008 
1009 		if (iref_status.errmsg_len != 0)
1010 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1011 			    iref_status.name_len, iref_status.errmsg_len);
1012 		break;
1013 	case GOT_IMSG_SEND_DONE:
1014 		if (datalen != 0) {
1015 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1016 			break;
1017 		}
1018 		*done = 1;
1019 		break;
1020 	default:
1021 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1022 		break;
1023 	}
1024 
1025 	imsg_free(&imsg);
1026 	return err;
1027 }
1028 
1029 const struct got_error *
1030 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_hash,
1031     int fd)
1032 {
1033 	const struct got_error *err = NULL;
1034 
1035 	/* Keep in sync with struct got_imsg_index_pack_request */
1036 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1037 	    pack_hash, SHA1_DIGEST_LENGTH) == -1) {
1038 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1039 		close(fd);
1040 		return err;
1041 	}
1042 	return flush_imsg(ibuf);
1043 }
1044 
1045 const struct got_error *
1046 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1047 {
1048 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1049 }
1050 
1051 const struct got_error *
1052 got_privsep_recv_index_progress(int *done, int *nobj_total,
1053     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1054     struct imsgbuf *ibuf)
1055 {
1056 	const struct got_error *err = NULL;
1057 	struct imsg imsg;
1058 	struct got_imsg_index_pack_progress *iprogress;
1059 	size_t datalen;
1060 
1061 	*done = 0;
1062 	*nobj_total = 0;
1063 	*nobj_indexed = 0;
1064 	*nobj_resolved = 0;
1065 
1066 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1067 	if (err)
1068 		return err;
1069 
1070 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1071 	switch (imsg.hdr.type) {
1072 	case GOT_IMSG_IDXPACK_PROGRESS:
1073 		if (datalen < sizeof(*iprogress)) {
1074 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1075 			break;
1076 		}
1077 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1078 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1079 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1080 			err = got_error(GOT_ERR_RANGE);
1081 			break;
1082 		}
1083 		*nobj_total = iprogress->nobj_total;
1084 		*nobj_indexed = iprogress->nobj_indexed;
1085 		*nobj_loose = iprogress->nobj_loose;
1086 		*nobj_resolved = iprogress->nobj_resolved;
1087 		break;
1088 	case GOT_IMSG_IDXPACK_DONE:
1089 		if (datalen != 0) {
1090 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1091 			break;
1092 		}
1093 		*done = 1;
1094 		break;
1095 	default:
1096 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1097 		break;
1098 	}
1099 
1100 	imsg_free(&imsg);
1101 	return err;
1102 }
1103 
1104 const struct got_error *
1105 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1106     struct imsgbuf *ibuf)
1107 {
1108 	struct got_imsg_object *iobj;
1109 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1110 
1111 	if (datalen != sizeof(*iobj))
1112 		return got_error(GOT_ERR_PRIVSEP_LEN);
1113 	iobj = imsg->data;
1114 
1115 	if (iobj->pack_offset < 0)
1116 		return got_error(GOT_ERR_PACK_OFFSET);
1117 
1118 	*obj = calloc(1, sizeof(**obj));
1119 	if (*obj == NULL)
1120 		return got_error_from_errno("calloc");
1121 
1122 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1123 	(*obj)->type = iobj->type;
1124 	(*obj)->flags = iobj->flags;
1125 	(*obj)->hdrlen = iobj->hdrlen;
1126 	(*obj)->size = iobj->size;
1127 	/* path_packfile is handled by caller */
1128 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1129 		(*obj)->pack_offset = iobj->pack_offset;
1130 		(*obj)->pack_idx = iobj->pack_idx;
1131 	}
1132 	STAILQ_INIT(&(*obj)->deltas.entries);
1133 	return NULL;
1134 }
1135 
1136 const struct got_error *
1137 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1138 {
1139 	const struct got_error *err = NULL;
1140 	struct imsg imsg;
1141 	const size_t min_datalen =
1142 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1143 
1144 	*obj = NULL;
1145 
1146 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1147 	if (err)
1148 		return err;
1149 
1150 	switch (imsg.hdr.type) {
1151 	case GOT_IMSG_OBJECT:
1152 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1153 		break;
1154 	default:
1155 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1156 		break;
1157 	}
1158 
1159 	imsg_free(&imsg);
1160 
1161 	return err;
1162 }
1163 
1164 static const struct got_error *
1165 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1166     size_t logmsg_len)
1167 {
1168 	const struct got_error *err = NULL;
1169 	size_t offset, remain;
1170 
1171 	offset = 0;
1172 	remain = logmsg_len;
1173 	while (remain > 0) {
1174 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1175 
1176 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1177 		    commit->logmsg + offset, n) == -1) {
1178 			err = got_error_from_errno("imsg_compose "
1179 			    "COMMIT_LOGMSG");
1180 			break;
1181 		}
1182 
1183 		err = flush_imsg(ibuf);
1184 		if (err)
1185 			break;
1186 
1187 		offset += n;
1188 		remain -= n;
1189 	}
1190 
1191 	return err;
1192 }
1193 
1194 const struct got_error *
1195 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1196 {
1197 	const struct got_error *err = NULL;
1198 	struct got_imsg_commit_object *icommit;
1199 	uint8_t *buf;
1200 	size_t len, total;
1201 	struct got_object_qid *qid;
1202 	size_t author_len = strlen(commit->author);
1203 	size_t committer_len = strlen(commit->committer);
1204 	size_t logmsg_len = strlen(commit->logmsg);
1205 
1206 	total = sizeof(*icommit) + author_len + committer_len +
1207 	    commit->nparents * sizeof(struct got_object_id);
1208 
1209 	buf = malloc(total);
1210 	if (buf == NULL)
1211 		return got_error_from_errno("malloc");
1212 
1213 	icommit = (struct got_imsg_commit_object *)buf;
1214 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1215 	icommit->author_len = author_len;
1216 	icommit->author_time = commit->author_time;
1217 	icommit->author_gmtoff = commit->author_gmtoff;
1218 	icommit->committer_len = committer_len;
1219 	icommit->committer_time = commit->committer_time;
1220 	icommit->committer_gmtoff = commit->committer_gmtoff;
1221 	icommit->logmsg_len = logmsg_len;
1222 	icommit->nparents = commit->nparents;
1223 
1224 	len = sizeof(*icommit);
1225 	memcpy(buf + len, commit->author, author_len);
1226 	len += author_len;
1227 	memcpy(buf + len, commit->committer, committer_len);
1228 	len += committer_len;
1229 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1230 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1231 		len += sizeof(qid->id);
1232 	}
1233 
1234 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1235 		err = got_error_from_errno("imsg_compose COMMIT");
1236 		goto done;
1237 	}
1238 
1239 	if (logmsg_len == 0 ||
1240 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1241 		err = flush_imsg(ibuf);
1242 		if (err)
1243 			goto done;
1244 	}
1245 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1246 done:
1247 	free(buf);
1248 	return err;
1249 }
1250 
1251 static const struct got_error *
1252 get_commit_from_imsg(struct got_commit_object **commit,
1253     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1254 {
1255 	const struct got_error *err = NULL;
1256 	struct got_imsg_commit_object *icommit;
1257 	size_t len = 0;
1258 	int i;
1259 
1260 	if (datalen < sizeof(*icommit))
1261 		return got_error(GOT_ERR_PRIVSEP_LEN);
1262 
1263 	icommit = imsg->data;
1264 	if (datalen != sizeof(*icommit) + icommit->author_len +
1265 	    icommit->committer_len +
1266 	    icommit->nparents * sizeof(struct got_object_id))
1267 		return got_error(GOT_ERR_PRIVSEP_LEN);
1268 
1269 	if (icommit->nparents < 0)
1270 		return got_error(GOT_ERR_PRIVSEP_LEN);
1271 
1272 	len += sizeof(*icommit);
1273 
1274 	*commit = got_object_commit_alloc_partial();
1275 	if (*commit == NULL)
1276 		return got_error_from_errno(
1277 		    "got_object_commit_alloc_partial");
1278 
1279 	memcpy((*commit)->tree_id, &icommit->tree_id,
1280 	    sizeof(icommit->tree_id));
1281 	(*commit)->author_time = icommit->author_time;
1282 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1283 	(*commit)->committer_time = icommit->committer_time;
1284 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1285 
1286 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1287 	if ((*commit)->author == NULL) {
1288 		err = got_error_from_errno("strndup");
1289 		goto done;
1290 	}
1291 	len += icommit->author_len;
1292 
1293 	(*commit)->committer = strndup(imsg->data + len,
1294 	    icommit->committer_len);
1295 	if ((*commit)->committer == NULL) {
1296 		err = got_error_from_errno("strndup");
1297 		goto done;
1298 	}
1299 	len += icommit->committer_len;
1300 
1301 	if (icommit->logmsg_len == 0) {
1302 		(*commit)->logmsg = strdup("");
1303 		if ((*commit)->logmsg == NULL) {
1304 			err = got_error_from_errno("strdup");
1305 			goto done;
1306 		}
1307 	} else {
1308 		size_t offset = 0, remain = icommit->logmsg_len;
1309 
1310 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1311 		if ((*commit)->logmsg == NULL) {
1312 			err = got_error_from_errno("malloc");
1313 			goto done;
1314 		}
1315 		while (remain > 0) {
1316 			struct imsg imsg_log;
1317 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1318 			    remain);
1319 
1320 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1321 			if (err)
1322 				goto done;
1323 
1324 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1325 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1326 				goto done;
1327 			}
1328 
1329 			memcpy((*commit)->logmsg + offset,
1330 			    imsg_log.data, n);
1331 			imsg_free(&imsg_log);
1332 			offset += n;
1333 			remain -= n;
1334 		}
1335 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1336 	}
1337 
1338 	for (i = 0; i < icommit->nparents; i++) {
1339 		struct got_object_qid *qid;
1340 
1341 		err = got_object_qid_alloc_partial(&qid);
1342 		if (err)
1343 			break;
1344 		memcpy(&qid->id, imsg->data + len +
1345 		    i * sizeof(qid->id), sizeof(qid->id));
1346 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1347 		(*commit)->nparents++;
1348 	}
1349 done:
1350 	if (err) {
1351 		got_object_commit_close(*commit);
1352 		*commit = NULL;
1353 	}
1354 	return err;
1355 }
1356 
1357 const struct got_error *
1358 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1359 {
1360 	const struct got_error *err = NULL;
1361 	struct imsg imsg;
1362 	size_t datalen;
1363 	const size_t min_datalen =
1364 	    MIN(sizeof(struct got_imsg_error),
1365 	    sizeof(struct got_imsg_commit_object));
1366 
1367 	*commit = NULL;
1368 
1369 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1370 	if (err)
1371 		return err;
1372 
1373 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1374 
1375 	switch (imsg.hdr.type) {
1376 	case GOT_IMSG_COMMIT:
1377 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1378 		break;
1379 	default:
1380 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1381 		break;
1382 	}
1383 
1384 	imsg_free(&imsg);
1385 
1386 	return err;
1387 }
1388 
1389 static const struct got_error *
1390 send_tree_entries_batch(struct imsgbuf *ibuf,
1391     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1392 {
1393 	struct ibuf *wbuf;
1394 	struct got_imsg_tree_entries ientries;
1395 	int i;
1396 
1397 	memset(&ientries, 0, sizeof(ientries));
1398 
1399 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1400 	if (wbuf == NULL)
1401 		return got_error_from_errno("imsg_create TREE_ENTRY");
1402 
1403 	ientries.nentries = idxN - idx0 + 1;
1404 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1405 		return got_error_from_errno("imsg_add TREE_ENTRY");
1406 
1407 	for (i = idx0; i <= idxN; i++) {
1408 		static const char gap[12]; /* for sha1-inside-sha256 alignment */
1409 		struct got_parsed_tree_entry *pte = &entries[i];
1410 		int algo = GOT_HASH_SHA256;
1411 
1412 		if (pte->idlen != SHA256_DIGEST_LENGTH)
1413 			algo = GOT_HASH_SHA1;
1414 
1415 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1416 		if (imsg_add(wbuf, pte->id, pte->idlen) == -1)
1417 			return got_error_from_errno("imsg_add TREE_ENTRY");
1418 		if (pte->idlen != SHA256_DIGEST_LENGTH &&
1419 		    imsg_add(wbuf, gap, sizeof(gap)) == -1)
1420 			return got_error_from_errno("imsg_add TREE_ENTRY");
1421 		if (imsg_add(wbuf, &algo, sizeof(algo)) == -1)
1422 			return got_error_from_errno("imsg_add TREE_ENTRY");
1423 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1424 			return got_error_from_errno("imsg_add TREE_ENTRY");
1425 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1426 			return got_error_from_errno("imsg_add TREE_ENTRY");
1427 
1428 		/* Remaining bytes are the id and entry's name. */
1429 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1430 			return got_error_from_errno("imsg_add TREE_ENTRY");
1431 	}
1432 
1433 	wbuf->fd = -1;
1434 	imsg_close(ibuf, wbuf);
1435 	return NULL;
1436 }
1437 
1438 static const struct got_error *
1439 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1440     int nentries)
1441 {
1442 	const struct got_error *err = NULL;
1443 	int i, j;
1444 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1445 
1446 	i = 0;
1447 	for (j = 0; j < nentries; j++) {
1448 		struct got_parsed_tree_entry *pte = &entries[j];
1449 		size_t len = SHA256_DIGEST_LENGTH + sizeof(pte->mode) +
1450 		    sizeof(pte->namelen) + pte->namelen;
1451 
1452 		if (j > 0 &&
1453 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1454 			err = send_tree_entries_batch(ibuf, entries,
1455 			    i, j - 1, entries_len);
1456 			if (err)
1457 				return err;
1458 			i = j;
1459 			entries_len = sizeof(struct got_imsg_tree_entries);
1460 		}
1461 
1462 		entries_len += len;
1463 	}
1464 
1465 	if (j > 0) {
1466 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1467 		    entries_len);
1468 		if (err)
1469 			return err;
1470 	}
1471 
1472 	return NULL;
1473 }
1474 
1475 const struct got_error *
1476 got_privsep_send_tree(struct imsgbuf *ibuf,
1477     struct got_parsed_tree_entry *entries, int nentries)
1478 {
1479 	const struct got_error *err = NULL;
1480 	struct got_imsg_tree_object itree;
1481 
1482 	memset(&itree, 0, sizeof(itree));
1483 	itree.nentries = nentries;
1484 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1485 	    == -1)
1486 		return got_error_from_errno("imsg_compose TREE");
1487 
1488 	err = send_tree_entries(ibuf, entries, nentries);
1489 	if (err)
1490 		return err;
1491 
1492 	return flush_imsg(ibuf);
1493 }
1494 
1495 
1496 static const struct got_error *
1497 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1498     int *nentries)
1499 {
1500 	const struct got_error *err = NULL;
1501 	struct got_imsg_tree_entries *ientries;
1502 	struct got_tree_entry *te;
1503 	size_t te_offset;
1504 	size_t i;
1505 
1506 	if (datalen <= sizeof(*ientries) ||
1507 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1508 		return got_error(GOT_ERR_PRIVSEP_LEN);
1509 
1510 	ientries = (struct got_imsg_tree_entries *)data;
1511 	if (ientries->nentries > INT_MAX) {
1512 		return got_error_msg(GOT_ERR_NO_SPACE,
1513 		    "too many tree entries");
1514 	}
1515 
1516 	te_offset = sizeof(*ientries);
1517 	for (i = 0; i < ientries->nentries; i++) {
1518 		struct got_imsg_tree_entry ite;
1519 		const char *te_name;
1520 		uint8_t *buf = (uint8_t *)data + te_offset;
1521 
1522 		if (te_offset >= datalen) {
1523 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1524 			break;
1525 		}
1526 
1527 		/* Might not be aligned, size is ~32 bytes. */
1528 		memcpy(&ite, buf, sizeof(ite));
1529 
1530 		if (ite.namelen >= sizeof(te->name)) {
1531 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1532 			break;
1533 		}
1534 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1535 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1536 			break;
1537 		}
1538 
1539 		if (*nentries >= tree->nentries) {
1540 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1541 			break;
1542 		}
1543 		te = &tree->entries[*nentries];
1544 		te_name = buf + sizeof(ite);
1545 		memcpy(te->name, te_name, ite.namelen);
1546 		te->name[ite.namelen] = '\0';
1547 		memcpy(te->id.hash, ite.id, sizeof(te->id.hash));
1548 		te->id.algo = ite.algo;
1549 		te->mode = ite.mode;
1550 		te->idx = *nentries;
1551 		(*nentries)++;
1552 
1553 		te_offset += sizeof(ite) + ite.namelen;
1554 	}
1555 
1556 	return err;
1557 }
1558 
1559 const struct got_error *
1560 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1561 {
1562 	const struct got_error *err = NULL;
1563 	const size_t min_datalen =
1564 	    MIN(sizeof(struct got_imsg_error),
1565 	    sizeof(struct got_imsg_tree_object));
1566 	struct got_imsg_tree_object *itree;
1567 	int nentries = 0;
1568 
1569 	*tree = NULL;
1570 
1571 	while (*tree == NULL || nentries < (*tree)->nentries) {
1572 		struct imsg imsg;
1573 		size_t datalen;
1574 
1575 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1576 		if (err)
1577 			break;
1578 
1579 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1580 
1581 		switch (imsg.hdr.type) {
1582 		case GOT_IMSG_TREE:
1583 			/* This message should only appear once. */
1584 			if (*tree != NULL) {
1585 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1586 				break;
1587 			}
1588 			if (datalen != sizeof(*itree)) {
1589 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1590 				break;
1591 			}
1592 			itree = imsg.data;
1593 			if (itree->nentries < 0) {
1594 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1595 				break;
1596 			}
1597 			*tree = malloc(sizeof(**tree));
1598 			if (*tree == NULL) {
1599 				err = got_error_from_errno("malloc");
1600 				break;
1601 			}
1602 			(*tree)->entries = calloc(itree->nentries,
1603 			    sizeof(struct got_tree_entry));
1604 			if ((*tree)->entries == NULL) {
1605 				err = got_error_from_errno("malloc");
1606 				free(*tree);
1607 				*tree = NULL;
1608 				break;
1609 			}
1610 			(*tree)->nentries = itree->nentries;
1611 			(*tree)->refcnt = 0;
1612 			break;
1613 		case GOT_IMSG_TREE_ENTRIES:
1614 			/* This message should be preceeded by GOT_IMSG_TREE. */
1615 			if (*tree == NULL) {
1616 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1617 				break;
1618 			}
1619 			err = recv_tree_entries(imsg.data, datalen,
1620 			    *tree, &nentries);
1621 			break;
1622 		default:
1623 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1624 			break;
1625 		}
1626 
1627 		imsg_free(&imsg);
1628 		if (err)
1629 			break;
1630 	}
1631 
1632 	if (*tree && (*tree)->nentries != nentries) {
1633 		if (err == NULL)
1634 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1635 		got_object_tree_close(*tree);
1636 		*tree = NULL;
1637 	}
1638 
1639 	return err;
1640 }
1641 
1642 const struct got_error *
1643 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1644     const uint8_t *data)
1645 {
1646 	struct got_imsg_blob iblob;
1647 
1648 	memset(&iblob, 0, sizeof(iblob));
1649 	iblob.size = size;
1650 	iblob.hdrlen = hdrlen;
1651 
1652 	if (data) {
1653 		uint8_t *buf;
1654 
1655 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1656 			return got_error(GOT_ERR_NO_SPACE);
1657 
1658 		buf = malloc(sizeof(iblob) + size);
1659 		if (buf == NULL)
1660 			return got_error_from_errno("malloc");
1661 
1662 		memcpy(buf, &iblob, sizeof(iblob));
1663 		memcpy(buf + sizeof(iblob), data, size);
1664 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1665 		    sizeof(iblob) + size) == -1) {
1666 			free(buf);
1667 			return got_error_from_errno("imsg_compose BLOB");
1668 		}
1669 		free(buf);
1670 	} else {
1671 		/* Data has already been written to file descriptor. */
1672 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1673 		    sizeof(iblob)) == -1)
1674 			return got_error_from_errno("imsg_compose BLOB");
1675 	}
1676 
1677 
1678 	return flush_imsg(ibuf);
1679 }
1680 
1681 const struct got_error *
1682 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1683     struct imsgbuf *ibuf)
1684 {
1685 	const struct got_error *err = NULL;
1686 	struct imsg imsg;
1687 	struct got_imsg_blob *iblob;
1688 	size_t datalen;
1689 
1690 	*outbuf = NULL;
1691 
1692 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1693 	if (err)
1694 		return err;
1695 
1696 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1697 
1698 	switch (imsg.hdr.type) {
1699 	case GOT_IMSG_BLOB:
1700 		if (datalen < sizeof(*iblob)) {
1701 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1702 			break;
1703 		}
1704 		iblob = imsg.data;
1705 		*size = iblob->size;
1706 		*hdrlen = iblob->hdrlen;
1707 
1708 		if (datalen == sizeof(*iblob)) {
1709 			/* Data has been written to file descriptor. */
1710 			break;
1711 		}
1712 
1713 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1714 		    *size > datalen + sizeof(*iblob)) {
1715 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1716 			break;
1717 		}
1718 
1719 		*outbuf = malloc(*size);
1720 		if (*outbuf == NULL) {
1721 			err = got_error_from_errno("malloc");
1722 			break;
1723 		}
1724 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1725 		break;
1726 	default:
1727 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1728 		break;
1729 	}
1730 
1731 	imsg_free(&imsg);
1732 
1733 	return err;
1734 }
1735 
1736 static const struct got_error *
1737 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1738 {
1739 	const struct got_error *err = NULL;
1740 	size_t offset, remain;
1741 
1742 	offset = 0;
1743 	remain = tagmsg_len;
1744 	while (remain > 0) {
1745 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1746 
1747 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1748 		    tag->tagmsg + offset, n) == -1) {
1749 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1750 			break;
1751 		}
1752 
1753 		err = flush_imsg(ibuf);
1754 		if (err)
1755 			break;
1756 
1757 		offset += n;
1758 		remain -= n;
1759 	}
1760 
1761 	return err;
1762 }
1763 
1764 const struct got_error *
1765 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1766 {
1767 	const struct got_error *err = NULL;
1768 	struct got_imsg_tag_object *itag;
1769 	uint8_t *buf;
1770 	size_t len, total;
1771 	size_t tag_len = strlen(tag->tag);
1772 	size_t tagger_len = strlen(tag->tagger);
1773 	size_t tagmsg_len = strlen(tag->tagmsg);
1774 
1775 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1776 
1777 	buf = malloc(total);
1778 	if (buf == NULL)
1779 		return got_error_from_errno("malloc");
1780 
1781 	itag = (struct got_imsg_tag_object *)buf;
1782 	memcpy(itag->id, tag->id.hash, sizeof(itag->id));
1783 	itag->obj_type = tag->obj_type;
1784 	itag->tag_len = tag_len;
1785 	itag->tagger_len = tagger_len;
1786 	itag->tagger_time = tag->tagger_time;
1787 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1788 	itag->tagmsg_len = tagmsg_len;
1789 
1790 	len = sizeof(*itag);
1791 	memcpy(buf + len, tag->tag, tag_len);
1792 	len += tag_len;
1793 	memcpy(buf + len, tag->tagger, tagger_len);
1794 	len += tagger_len;
1795 
1796 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1797 		err = got_error_from_errno("imsg_compose TAG");
1798 		goto done;
1799 	}
1800 
1801 	if (tagmsg_len == 0 ||
1802 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1803 		err = flush_imsg(ibuf);
1804 		if (err)
1805 			goto done;
1806 	}
1807 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1808 done:
1809 	free(buf);
1810 	return err;
1811 }
1812 
1813 const struct got_error *
1814 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1815 {
1816 	const struct got_error *err = NULL;
1817 	struct imsg imsg;
1818 	struct got_imsg_tag_object *itag;
1819 	size_t len, datalen;
1820 	const size_t min_datalen =
1821 	    MIN(sizeof(struct got_imsg_error),
1822 	    sizeof(struct got_imsg_tag_object));
1823 
1824 	*tag = NULL;
1825 
1826 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1827 	if (err)
1828 		return err;
1829 
1830 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1831 	len = 0;
1832 
1833 	switch (imsg.hdr.type) {
1834 	case GOT_IMSG_TAG:
1835 		if (datalen < sizeof(*itag)) {
1836 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1837 			break;
1838 		}
1839 		itag = imsg.data;
1840 		if (datalen != sizeof(*itag) + itag->tag_len +
1841 		    itag->tagger_len) {
1842 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1843 			break;
1844 		}
1845 		len += sizeof(*itag);
1846 
1847 		*tag = calloc(1, sizeof(**tag));
1848 		if (*tag == NULL) {
1849 			err = got_error_from_errno("calloc");
1850 			break;
1851 		}
1852 
1853 		memcpy((*tag)->id.hash, itag->id, SHA1_DIGEST_LENGTH);
1854 
1855 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1856 		if ((*tag)->tag == NULL) {
1857 			err = got_error_from_errno("strndup");
1858 			break;
1859 		}
1860 		len += itag->tag_len;
1861 
1862 		(*tag)->obj_type = itag->obj_type;
1863 		(*tag)->tagger_time = itag->tagger_time;
1864 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1865 
1866 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1867 		if ((*tag)->tagger == NULL) {
1868 			err = got_error_from_errno("strndup");
1869 			break;
1870 		}
1871 		len += itag->tagger_len;
1872 
1873 		if (itag->tagmsg_len == 0) {
1874 			(*tag)->tagmsg = strdup("");
1875 			if ((*tag)->tagmsg == NULL) {
1876 				err = got_error_from_errno("strdup");
1877 				break;
1878 			}
1879 		} else {
1880 			size_t offset = 0, remain = itag->tagmsg_len;
1881 
1882 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1883 			if ((*tag)->tagmsg == NULL) {
1884 				err = got_error_from_errno("malloc");
1885 				break;
1886 			}
1887 			while (remain > 0) {
1888 				struct imsg imsg_log;
1889 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1890 				    remain);
1891 
1892 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1893 				if (err)
1894 					return err;
1895 
1896 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1897 					return got_error(GOT_ERR_PRIVSEP_MSG);
1898 
1899 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1900 				    n);
1901 				imsg_free(&imsg_log);
1902 				offset += n;
1903 				remain -= n;
1904 			}
1905 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1906 		}
1907 
1908 		break;
1909 	default:
1910 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1911 		break;
1912 	}
1913 
1914 	imsg_free(&imsg);
1915 
1916 	return err;
1917 }
1918 
1919 const struct got_error *
1920 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1921     struct got_packidx *packidx)
1922 {
1923 	const struct got_error *err = NULL;
1924 	struct got_imsg_packidx ipackidx;
1925 	struct got_imsg_pack ipack;
1926 	int fd;
1927 
1928 	memset(&ipackidx, 0, sizeof(ipackidx));
1929 	memset(&ipack, 0, sizeof(ipack));
1930 
1931 	ipackidx.len = packidx->len;
1932 	ipackidx.packfile_size = pack->filesize;
1933 	fd = dup(packidx->fd);
1934 	if (fd == -1)
1935 		return got_error_from_errno("dup");
1936 
1937 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1938 	    sizeof(ipackidx)) == -1) {
1939 		err = got_error_from_errno("imsg_compose PACKIDX");
1940 		close(fd);
1941 		return err;
1942 	}
1943 
1944 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1945 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1946 		return got_error(GOT_ERR_NO_SPACE);
1947 	ipack.filesize = pack->filesize;
1948 
1949 	fd = dup(pack->fd);
1950 	if (fd == -1)
1951 		return got_error_from_errno("dup");
1952 
1953 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1954 	    == -1) {
1955 		err = got_error_from_errno("imsg_compose PACK");
1956 		close(fd);
1957 		return err;
1958 	}
1959 
1960 	return flush_imsg(ibuf);
1961 }
1962 
1963 const struct got_error *
1964 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1965     struct got_object_id *id)
1966 {
1967 	struct got_imsg_packed_object iobj;
1968 
1969 	memset(&iobj, 0, sizeof(iobj));
1970 	iobj.idx = idx;
1971 	memcpy(&iobj.id, id, sizeof(iobj.id));
1972 
1973 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1974 	    &iobj, sizeof(iobj)) == -1)
1975 		return got_error_from_errno("imsg_compose "
1976 		    "PACKED_OBJECT_REQUEST");
1977 
1978 	return flush_imsg(ibuf);
1979 }
1980 
1981 const struct got_error *
1982 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1983     struct got_object_id *id)
1984 {
1985 	struct got_imsg_packed_object iobj;
1986 
1987 	memset(&iobj, 0, sizeof(iobj));
1988 	iobj.idx = idx;
1989 	memcpy(&iobj.id, id, sizeof(iobj.id));
1990 
1991 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
1992 	    &iobj, sizeof(iobj)) == -1)
1993 		return got_error_from_errno("imsg_compose "
1994 		    "PACKED_OBJECT_REQUEST");
1995 
1996 	return flush_imsg(ibuf);
1997 }
1998 
1999 const struct got_error *
2000 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2001 {
2002 	const struct got_error *err = NULL;
2003 
2004 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2005 	    NULL, 0) == -1) {
2006 		err = got_error_from_errno("imsg_compose "
2007 		    "GITCONFIG_PARSE_REQUEST");
2008 		close(fd);
2009 		return err;
2010 	}
2011 
2012 	return flush_imsg(ibuf);
2013 }
2014 
2015 const struct got_error *
2016 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2017 {
2018 	if (imsg_compose(ibuf,
2019 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2020 	    NULL, 0) == -1)
2021 		return got_error_from_errno("imsg_compose "
2022 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2023 
2024 	return flush_imsg(ibuf);
2025 }
2026 
2027 const struct got_error *
2028 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2029 {
2030 	if (imsg_compose(ibuf,
2031 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2032 	    NULL, 0) == -1)
2033 		return got_error_from_errno("imsg_compose "
2034 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2035 
2036 	return flush_imsg(ibuf);
2037 }
2038 
2039 
2040 const struct got_error *
2041 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2042 {
2043 	if (imsg_compose(ibuf,
2044 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2045 		return got_error_from_errno("imsg_compose "
2046 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2047 
2048 	return flush_imsg(ibuf);
2049 }
2050 
2051 const struct got_error *
2052 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2053 {
2054 	if (imsg_compose(ibuf,
2055 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2056 		return got_error_from_errno("imsg_compose "
2057 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2058 
2059 	return flush_imsg(ibuf);
2060 }
2061 
2062 const struct got_error *
2063 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2064 {
2065 	if (imsg_compose(ibuf,
2066 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2067 		return got_error_from_errno("imsg_compose "
2068 		    "GITCONFIG_REMOTE_REQUEST");
2069 
2070 	return flush_imsg(ibuf);
2071 }
2072 
2073 const struct got_error *
2074 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2075 {
2076 	if (imsg_compose(ibuf,
2077 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2078 		return got_error_from_errno("imsg_compose "
2079 		    "GITCONFIG_OWNER_REQUEST");
2080 
2081 	return flush_imsg(ibuf);
2082 }
2083 
2084 const struct got_error *
2085 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2086 {
2087 	const struct got_error *err = NULL;
2088 	struct imsg imsg;
2089 	size_t datalen;
2090 
2091 	*str = NULL;
2092 
2093 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2094 	if (err)
2095 		return err;
2096 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2097 
2098 	switch (imsg.hdr.type) {
2099 	case GOT_IMSG_GITCONFIG_STR_VAL:
2100 		if (datalen == 0)
2101 			break;
2102 		*str = strndup(imsg.data, datalen);
2103 		if (*str == NULL) {
2104 			err = got_error_from_errno("strndup");
2105 			break;
2106 		}
2107 		break;
2108 	default:
2109 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2110 		break;
2111 	}
2112 
2113 	imsg_free(&imsg);
2114 	return err;
2115 }
2116 
2117 const struct got_error *
2118 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2119 {
2120 	const struct got_error *err = NULL;
2121 	struct imsg imsg;
2122 	size_t datalen;
2123 	const size_t min_datalen =
2124 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2125 
2126 	*val = 0;
2127 
2128 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2129 	if (err)
2130 		return err;
2131 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2132 
2133 	switch (imsg.hdr.type) {
2134 	case GOT_IMSG_GITCONFIG_INT_VAL:
2135 		if (datalen != sizeof(*val)) {
2136 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2137 			break;
2138 		}
2139 		memcpy(val, imsg.data, sizeof(*val));
2140 		break;
2141 	default:
2142 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2143 		break;
2144 	}
2145 
2146 	imsg_free(&imsg);
2147 	return err;
2148 }
2149 
2150 static void
2151 free_remote_data(struct got_remote_repo *remote)
2152 {
2153 	int i;
2154 
2155 	free(remote->name);
2156 	free(remote->fetch_url);
2157 	free(remote->send_url);
2158 	for (i = 0; i < remote->nfetch_branches; i++)
2159 		free(remote->fetch_branches[i]);
2160 	free(remote->fetch_branches);
2161 	for (i = 0; i < remote->nsend_branches; i++)
2162 		free(remote->send_branches[i]);
2163 	free(remote->send_branches);
2164 	for (i = 0; i < remote->nfetch_refs; i++)
2165 		free(remote->fetch_refs[i]);
2166 	free(remote->fetch_refs);
2167 }
2168 
2169 const struct got_error *
2170 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2171     int *nremotes, struct imsgbuf *ibuf)
2172 {
2173 	const struct got_error *err = NULL;
2174 	struct imsg imsg;
2175 	size_t datalen;
2176 	struct got_imsg_remotes iremotes;
2177 	struct got_imsg_remote iremote;
2178 
2179 	*remotes = NULL;
2180 	*nremotes = 0;
2181 	iremotes.nremotes = 0;
2182 
2183 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2184 	if (err)
2185 		return err;
2186 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2187 
2188 	switch (imsg.hdr.type) {
2189 	case GOT_IMSG_GITCONFIG_REMOTES:
2190 		if (datalen != sizeof(iremotes)) {
2191 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2192 			break;
2193 		}
2194 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2195 		if (iremotes.nremotes == 0) {
2196 			imsg_free(&imsg);
2197 			return NULL;
2198 		}
2199 		break;
2200 	default:
2201 		imsg_free(&imsg);
2202 		return got_error(GOT_ERR_PRIVSEP_MSG);
2203 	}
2204 
2205 	imsg_free(&imsg);
2206 
2207 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2208 	if (*remotes == NULL)
2209 		return got_error_from_errno("recallocarray");
2210 
2211 	while (*nremotes < iremotes.nremotes) {
2212 		struct got_remote_repo *remote;
2213 
2214 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2215 		if (err)
2216 			break;
2217 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2218 
2219 		switch (imsg.hdr.type) {
2220 		case GOT_IMSG_GITCONFIG_REMOTE:
2221 			remote = &(*remotes)[*nremotes];
2222 			memset(remote, 0, sizeof(*remote));
2223 			if (datalen < sizeof(iremote)) {
2224 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2225 				break;
2226 			}
2227 			memcpy(&iremote, imsg.data, sizeof(iremote));
2228 			if (iremote.name_len == 0 ||
2229 			    iremote.fetch_url_len == 0 ||
2230 			    iremote.send_url_len == 0 ||
2231 			    (sizeof(iremote) + iremote.name_len +
2232 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2233 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2234 				break;
2235 			}
2236 			remote->name = strndup(imsg.data + sizeof(iremote),
2237 			    iremote.name_len);
2238 			if (remote->name == NULL) {
2239 				err = got_error_from_errno("strndup");
2240 				break;
2241 			}
2242 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2243 			    iremote.name_len, iremote.fetch_url_len);
2244 			if (remote->fetch_url == NULL) {
2245 				err = got_error_from_errno("strndup");
2246 				free_remote_data(remote);
2247 				break;
2248 			}
2249 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2250 			    iremote.name_len + iremote.fetch_url_len,
2251 			    iremote.send_url_len);
2252 			if (remote->send_url == NULL) {
2253 				err = got_error_from_errno("strndup");
2254 				free_remote_data(remote);
2255 				break;
2256 			}
2257 			remote->mirror_references = iremote.mirror_references;
2258 			remote->fetch_all_branches = iremote.fetch_all_branches;
2259 			remote->nfetch_branches = 0;
2260 			remote->fetch_branches = NULL;
2261 			remote->nsend_branches = 0;
2262 			remote->send_branches = NULL;
2263 			remote->nfetch_refs = 0;
2264 			remote->fetch_refs = NULL;
2265 			(*nremotes)++;
2266 			break;
2267 		default:
2268 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2269 			break;
2270 		}
2271 
2272 		imsg_free(&imsg);
2273 		if (err)
2274 			break;
2275 	}
2276 
2277 	if (err) {
2278 		int i;
2279 		for (i = 0; i < *nremotes; i++)
2280 			free_remote_data(&(*remotes)[i]);
2281 		free(*remotes);
2282 		*remotes = NULL;
2283 		*nremotes = 0;
2284 	}
2285 	return err;
2286 }
2287 
2288 const struct got_error *
2289 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2290 {
2291 	const struct got_error *err = NULL;
2292 
2293 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2294 	    NULL, 0) == -1) {
2295 		err = got_error_from_errno("imsg_compose "
2296 		    "GOTCONFIG_PARSE_REQUEST");
2297 		close(fd);
2298 		return err;
2299 	}
2300 
2301 	return flush_imsg(ibuf);
2302 }
2303 
2304 const struct got_error *
2305 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2306 {
2307 	if (imsg_compose(ibuf,
2308 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2309 		return got_error_from_errno("imsg_compose "
2310 		    "GOTCONFIG_AUTHOR_REQUEST");
2311 
2312 	return flush_imsg(ibuf);
2313 }
2314 
2315 const struct got_error *
2316 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2317 {
2318 	if (imsg_compose(ibuf,
2319 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2320 		return got_error_from_errno("imsg_compose "
2321 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2322 
2323 	return flush_imsg(ibuf);
2324 }
2325 
2326 const struct got_error *
2327 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2328 {
2329 	if (imsg_compose(ibuf,
2330 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2331 		return got_error_from_errno("imsg_compose "
2332 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2333 
2334 	return flush_imsg(ibuf);
2335 }
2336 
2337 const struct got_error *
2338 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2339 {
2340 	if (imsg_compose(ibuf,
2341 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2342 		return got_error_from_errno("imsg_compose "
2343 		    "GOTCONFIG_SIGNERID_REQUEST");
2344 
2345 	return flush_imsg(ibuf);
2346 }
2347 
2348 const struct got_error *
2349 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2350 {
2351 	if (imsg_compose(ibuf,
2352 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2353 		return got_error_from_errno("imsg_compose "
2354 		    "GOTCONFIG_REMOTE_REQUEST");
2355 
2356 	return flush_imsg(ibuf);
2357 }
2358 
2359 const struct got_error *
2360 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2361 {
2362 	const struct got_error *err = NULL;
2363 	struct imsg imsg;
2364 	size_t datalen;
2365 
2366 	*str = NULL;
2367 
2368 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2369 	if (err)
2370 		return err;
2371 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2372 
2373 	switch (imsg.hdr.type) {
2374 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2375 		if (datalen == 0)
2376 			break;
2377 		*str = strndup(imsg.data, datalen);
2378 		if (*str == NULL) {
2379 			err = got_error_from_errno("strndup");
2380 			break;
2381 		}
2382 		break;
2383 	default:
2384 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2385 		break;
2386 	}
2387 
2388 	imsg_free(&imsg);
2389 	return err;
2390 }
2391 
2392 const struct got_error *
2393 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2394     int *nremotes, struct imsgbuf *ibuf)
2395 {
2396 	const struct got_error *err = NULL;
2397 	struct imsg imsg;
2398 	size_t datalen;
2399 	struct got_imsg_remotes iremotes;
2400 	struct got_imsg_remote iremote;
2401 	const size_t min_datalen =
2402 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2403 
2404 	*remotes = NULL;
2405 	*nremotes = 0;
2406 	iremotes.nremotes = 0;
2407 
2408 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2409 	if (err)
2410 		return err;
2411 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2412 
2413 	switch (imsg.hdr.type) {
2414 	case GOT_IMSG_GOTCONFIG_REMOTES:
2415 		if (datalen != sizeof(iremotes)) {
2416 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2417 			break;
2418 		}
2419 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2420 		if (iremotes.nremotes < 0) {
2421 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2422 			break;
2423 		}
2424 		if (iremotes.nremotes == 0) {
2425 			imsg_free(&imsg);
2426 			return NULL;
2427 		}
2428 		break;
2429 	default:
2430 		imsg_free(&imsg);
2431 		return got_error(GOT_ERR_PRIVSEP_MSG);
2432 	}
2433 
2434 	imsg_free(&imsg);
2435 
2436 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2437 	if (*remotes == NULL)
2438 		return got_error_from_errno("recallocarray");
2439 
2440 	while (*nremotes < iremotes.nremotes) {
2441 		struct got_remote_repo *remote;
2442 		const size_t min_datalen =
2443 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2444 		int i;
2445 
2446 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2447 		if (err)
2448 			break;
2449 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2450 
2451 		switch (imsg.hdr.type) {
2452 		case GOT_IMSG_GOTCONFIG_REMOTE:
2453 			remote = &(*remotes)[*nremotes];
2454 			memset(remote, 0, sizeof(*remote));
2455 			if (datalen < sizeof(iremote)) {
2456 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2457 				break;
2458 			}
2459 			memcpy(&iremote, imsg.data, sizeof(iremote));
2460 			if (iremote.name_len == 0 ||
2461 			    (iremote.fetch_url_len == 0 &&
2462 			    iremote.send_url_len == 0) ||
2463 			    (sizeof(iremote) + iremote.name_len +
2464 			    iremote.fetch_url_len + iremote.send_url_len) >
2465 			    datalen) {
2466 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2467 				break;
2468 			}
2469 			remote->name = strndup(imsg.data + sizeof(iremote),
2470 			    iremote.name_len);
2471 			if (remote->name == NULL) {
2472 				err = got_error_from_errno("strndup");
2473 				break;
2474 			}
2475 			remote->fetch_url = strndup(imsg.data +
2476 			    sizeof(iremote) + iremote.name_len,
2477 			    iremote.fetch_url_len);
2478 			if (remote->fetch_url == NULL) {
2479 				err = got_error_from_errno("strndup");
2480 				free_remote_data(remote);
2481 				break;
2482 			}
2483 			remote->send_url = strndup(imsg.data +
2484 			    sizeof(iremote) + iremote.name_len +
2485 			    iremote.fetch_url_len, iremote.send_url_len);
2486 			if (remote->send_url == NULL) {
2487 				err = got_error_from_errno("strndup");
2488 				free_remote_data(remote);
2489 				break;
2490 			}
2491 			remote->mirror_references = iremote.mirror_references;
2492 			remote->fetch_all_branches = iremote.fetch_all_branches;
2493 			if (iremote.nfetch_branches > 0) {
2494 				remote->fetch_branches = recallocarray(NULL, 0,
2495 				    iremote.nfetch_branches, sizeof(char *));
2496 				if (remote->fetch_branches == NULL) {
2497 					err = got_error_from_errno("calloc");
2498 					free_remote_data(remote);
2499 					break;
2500 				}
2501 			}
2502 			remote->nfetch_branches = 0;
2503 			for (i = 0; i < iremote.nfetch_branches; i++) {
2504 				char *branch;
2505 				err = got_privsep_recv_gotconfig_str(&branch,
2506 				    ibuf);
2507 				if (err) {
2508 					free_remote_data(remote);
2509 					goto done;
2510 				}
2511 				remote->fetch_branches[i] = branch;
2512 				remote->nfetch_branches++;
2513 			}
2514 			if (iremote.nsend_branches > 0) {
2515 				remote->send_branches = recallocarray(NULL, 0,
2516 				    iremote.nsend_branches, sizeof(char *));
2517 				if (remote->send_branches == NULL) {
2518 					err = got_error_from_errno("calloc");
2519 					free_remote_data(remote);
2520 					break;
2521 				}
2522 			}
2523 			remote->nsend_branches = 0;
2524 			for (i = 0; i < iremote.nsend_branches; i++) {
2525 				char *branch;
2526 				err = got_privsep_recv_gotconfig_str(&branch,
2527 				    ibuf);
2528 				if (err) {
2529 					free_remote_data(remote);
2530 					goto done;
2531 				}
2532 				remote->send_branches[i] = branch;
2533 				remote->nsend_branches++;
2534 			}
2535 			if (iremote.nfetch_refs > 0) {
2536 				remote->fetch_refs = recallocarray(NULL, 0,
2537 				    iremote.nfetch_refs, sizeof(char *));
2538 				if (remote->fetch_refs == NULL) {
2539 					err = got_error_from_errno("calloc");
2540 					free_remote_data(remote);
2541 					break;
2542 				}
2543 			}
2544 			remote->nfetch_refs = 0;
2545 			for (i = 0; i < iremote.nfetch_refs; i++) {
2546 				char *ref;
2547 				err = got_privsep_recv_gotconfig_str(&ref,
2548 				    ibuf);
2549 				if (err) {
2550 					free_remote_data(remote);
2551 					goto done;
2552 				}
2553 				remote->fetch_refs[i] = ref;
2554 				remote->nfetch_refs++;
2555 			}
2556 			(*nremotes)++;
2557 			break;
2558 		default:
2559 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2560 			break;
2561 		}
2562 
2563 		imsg_free(&imsg);
2564 		if (err)
2565 			break;
2566 	}
2567 done:
2568 	if (err) {
2569 		int i;
2570 		for (i = 0; i < *nremotes; i++)
2571 			free_remote_data(&(*remotes)[i]);
2572 		free(*remotes);
2573 		*remotes = NULL;
2574 		*nremotes = 0;
2575 	}
2576 	return err;
2577 }
2578 
2579 const struct got_error *
2580 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2581     struct got_object_id *id, int idx, const char *path)
2582 {
2583 	struct ibuf *wbuf;
2584 	size_t path_len = strlen(path) + 1;
2585 
2586 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2587 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2588 	if (wbuf == NULL)
2589 		return got_error_from_errno(
2590 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2591 	if (imsg_add(wbuf, id->hash, SHA1_DIGEST_LENGTH) == -1)
2592 		return got_error_from_errno("imsg_add "
2593 		    "COMMIT_TRAVERSAL_REQUEST");
2594 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2595 		return got_error_from_errno("imsg_add "
2596 		    "COMMIT_TRAVERSAL_REQUEST");
2597 	if (imsg_add(wbuf, path, path_len) == -1)
2598 		return got_error_from_errno("imsg_add "
2599 		    "COMMIT_TRAVERSAL_REQUEST");
2600 
2601 	wbuf->fd = -1;
2602 	imsg_close(ibuf, wbuf);
2603 
2604 	return flush_imsg(ibuf);
2605 }
2606 
2607 const struct got_error *
2608 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2609     struct got_object_id **changed_commit_id,
2610     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2611 {
2612 	const struct got_error *err = NULL;
2613 	struct imsg imsg;
2614 	struct got_imsg_traversed_commits *icommits;
2615 	size_t datalen;
2616 	int i, done = 0;
2617 
2618 	*changed_commit = NULL;
2619 	*changed_commit_id = NULL;
2620 
2621 	while (!done) {
2622 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2623 		if (err)
2624 			return err;
2625 
2626 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2627 		switch (imsg.hdr.type) {
2628 		case GOT_IMSG_TRAVERSED_COMMITS:
2629 			icommits = imsg.data;
2630 			if (datalen != sizeof(*icommits) +
2631 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2632 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2633 				break;
2634 			}
2635 			for (i = 0; i < icommits->ncommits; i++) {
2636 				struct got_object_qid *qid;
2637 				uint8_t *hash = (uint8_t *)imsg.data +
2638 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2639 				err = got_object_qid_alloc_partial(&qid);
2640 				if (err)
2641 					break;
2642 				memcpy(qid->id.hash, hash, SHA1_DIGEST_LENGTH);
2643 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2644 
2645 				/* The last commit may contain a change. */
2646 				if (i == icommits->ncommits - 1) {
2647 					*changed_commit_id =
2648 					    got_object_id_dup(&qid->id);
2649 					if (*changed_commit_id == NULL) {
2650 						err = got_error_from_errno(
2651 						    "got_object_id_dup");
2652 						break;
2653 					}
2654 				}
2655 			}
2656 			break;
2657 		case GOT_IMSG_COMMIT:
2658 			if (*changed_commit_id == NULL) {
2659 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2660 				break;
2661 			}
2662 			err = get_commit_from_imsg(changed_commit, &imsg,
2663 			    datalen, ibuf);
2664 			break;
2665 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2666 			done = 1;
2667 			break;
2668 		default:
2669 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2670 			break;
2671 		}
2672 
2673 		imsg_free(&imsg);
2674 		if (err)
2675 			break;
2676 	}
2677 
2678 	if (err)
2679 		got_object_id_queue_free(commit_ids);
2680 	return err;
2681 }
2682 
2683 const struct got_error *
2684 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2685     struct got_object_id *tree_id, const char *path,
2686     struct got_parsed_tree_entry *entries, int nentries)
2687 {
2688 	const struct got_error *err = NULL;
2689 	struct ibuf *wbuf;
2690 	size_t path_len = strlen(path);
2691 	size_t msglen;
2692 
2693 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2694 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2695 	if (wbuf == NULL)
2696 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2697 
2698 	if (imsg_add(wbuf, tree_id->hash, SHA1_DIGEST_LENGTH) == -1)
2699 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2700 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2701 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2702 	if (imsg_add(wbuf, path, path_len) == -1)
2703 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2704 
2705 	wbuf->fd = -1;
2706 	imsg_close(ibuf, wbuf);
2707 
2708 	if (entries) {
2709 		err = send_tree_entries(ibuf, entries, nentries);
2710 		if (err)
2711 			return err;
2712 	}
2713 
2714 	return flush_imsg(ibuf);
2715 }
2716 
2717 const struct got_error *
2718 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2719 {
2720 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2721 	    0, 0, -1, NULL, 0) == -1)
2722 		return got_error_from_errno("imsg_compose "
2723 		    "OBJECT_ENUMERATION_REQUEST");
2724 
2725 	return flush_imsg(ibuf);
2726 }
2727 
2728 const struct got_error *
2729 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2730 {
2731 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2732 	    0, 0, -1, NULL, 0) == -1)
2733 		return got_error_from_errno("imsg_compose "
2734 		    "OBJECT_ENUMERATION_DONE");
2735 
2736 	return flush_imsg(ibuf);
2737 }
2738 
2739 const struct got_error *
2740 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2741 {
2742 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2743 	    0, 0, -1, NULL, 0) == -1)
2744 		return got_error_from_errno("imsg_compose "
2745 		    "OBJECT_ENUMERATION_INCOMPLETE");
2746 
2747 	return flush_imsg(ibuf);
2748 }
2749 
2750 const struct got_error *
2751 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2752     struct got_object_id *id, time_t mtime)
2753 {
2754 	struct ibuf *wbuf;
2755 
2756 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2757 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2758 	if (wbuf == NULL)
2759 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2760 
2761 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2762 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2763 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2764 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2765 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2766 
2767 	wbuf->fd = -1;
2768 	imsg_close(ibuf, wbuf);
2769 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2770 	return NULL;
2771 }
2772 
2773 const struct got_error *
2774 got_privsep_recv_enumerated_objects(int *found_all_objects,
2775     struct imsgbuf *ibuf,
2776     got_object_enumerate_commit_cb cb_commit,
2777     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2778     struct got_repository *repo)
2779 {
2780 	const struct got_error *err = NULL;
2781 	struct imsg imsg;
2782 	struct got_imsg_enumerated_commit *icommit = NULL;
2783 	struct got_object_id commit_id;
2784 	int have_commit = 0;
2785 	time_t mtime = 0;
2786 	struct got_tree_object tree;
2787 	struct got_imsg_enumerated_tree *itree;
2788 	struct got_object_id tree_id;
2789 	char *path = NULL, *canon_path = NULL;
2790 	size_t datalen, path_len;
2791 	int nentries = -1;
2792 	int done = 0;
2793 
2794 	*found_all_objects = 0;
2795 	memset(&tree, 0, sizeof(tree));
2796 
2797 	while (!done) {
2798 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2799 		if (err)
2800 			break;
2801 
2802 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2803 		switch (imsg.hdr.type) {
2804 		case GOT_IMSG_ENUMERATED_COMMIT:
2805 			if (have_commit && nentries != -1) {
2806 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2807 				break;
2808 			}
2809 			if (datalen != sizeof(*icommit)) {
2810 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2811 				break;
2812 			}
2813 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2814 			memcpy(commit_id.hash, icommit->id, SHA1_DIGEST_LENGTH);
2815 			mtime = icommit->mtime;
2816 			have_commit = 1;
2817 			break;
2818 		case GOT_IMSG_ENUMERATED_TREE:
2819 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2820 			if (!have_commit) {
2821 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2822 				break;
2823 			}
2824 			if (datalen < sizeof(*itree)) {
2825 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2826 				break;
2827 			}
2828 			itree = imsg.data;
2829 			path_len = datalen - sizeof(*itree);
2830 			if (path_len == 0) {
2831 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2832 				break;
2833 			}
2834 			memcpy(tree_id.hash, itree->id, sizeof(tree_id.hash));
2835 			free(path);
2836 			path = strndup(imsg.data + sizeof(*itree), path_len);
2837 			if (path == NULL) {
2838 				err = got_error_from_errno("strndup");
2839 				break;
2840 			}
2841 			free(canon_path);
2842 			canon_path = malloc(path_len + 1);
2843 			if (canon_path == NULL) {
2844 				err = got_error_from_errno("malloc");
2845 				break;
2846 			}
2847 			if (!got_path_is_absolute(path)) {
2848 				err = got_error(GOT_ERR_BAD_PATH);
2849 				break;
2850 			}
2851 			if (got_path_is_root_dir(path)) {
2852 				/* XXX check what got_canonpath() does wrong */
2853 				canon_path[0] = '/';
2854 				canon_path[1] = '\0';
2855 			} else {
2856 				err = got_canonpath(path, canon_path,
2857 				    path_len + 1);
2858 				if (err)
2859 					break;
2860 			}
2861 			if (strcmp(path, canon_path) != 0) {
2862 				err = got_error(GOT_ERR_BAD_PATH);
2863 				break;
2864 			}
2865 			if (nentries != -1) {
2866 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2867 				break;
2868 			}
2869 			if (itree->nentries < -1) {
2870 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2871 				break;
2872 			}
2873 			if (itree->nentries == -1) {
2874 				/* Tree was not found in pack file. */
2875 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2876 				    path, repo);
2877 				break;
2878 			}
2879 			if (itree->nentries > INT_MAX) {
2880 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2881 				break;
2882 			}
2883 			tree.entries = calloc(itree->nentries,
2884 			    sizeof(struct got_tree_entry));
2885 			if (tree.entries == NULL) {
2886 				err = got_error_from_errno("calloc");
2887 				break;
2888 			}
2889 			if (itree->nentries == 0) {
2890 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2891 				    path, repo);
2892 				if (err)
2893 					break;
2894 
2895 				/* Prepare for next tree. */
2896 				free(tree.entries);
2897 				memset(&tree, 0, sizeof(tree));
2898 				nentries = -1;
2899 			} else {
2900 				tree.nentries = itree->nentries;
2901 				nentries = 0;
2902 			}
2903 			break;
2904 		case GOT_IMSG_TREE_ENTRIES:
2905 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2906 			if (nentries <= -1) {
2907 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2908 				break;
2909 			}
2910 			err = recv_tree_entries(imsg.data, datalen,
2911 			    &tree, &nentries);
2912 			if (err)
2913 				break;
2914 			if (tree.nentries == nentries) {
2915 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2916 				    path, repo);
2917 				if (err)
2918 					break;
2919 
2920 				/* Prepare for next tree. */
2921 				free(tree.entries);
2922 				memset(&tree, 0, sizeof(tree));
2923 				nentries = -1;
2924 			}
2925 			break;
2926 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2927 			/* All trees have been found and traversed. */
2928 			if (!have_commit || path == NULL || nentries != -1) {
2929 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2930 				break;
2931 			}
2932 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2933 			if (err)
2934 				break;
2935 			have_commit = 0;
2936 			break;
2937 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2938 			*found_all_objects = 1;
2939 			done = 1;
2940 			break;
2941 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
2942 			done = 1;
2943 			break;
2944 		default:
2945 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2946 			break;
2947 		}
2948 
2949 		imsg_free(&imsg);
2950 		if (err)
2951 			break;
2952 	}
2953 
2954 	free(path);
2955 	free(canon_path);
2956 	free(tree.entries);
2957 	return err;
2958 }
2959 
2960 const struct got_error *
2961 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2962     struct got_object_id *id)
2963 {
2964 	struct got_imsg_raw_delta_request dreq;
2965 
2966 	memset(&dreq, 0, sizeof(dreq));
2967 	dreq.idx = idx;
2968 	memcpy(&dreq.id, id, sizeof(dreq.id));
2969 
2970 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
2971 	    &dreq, sizeof(dreq)) == -1)
2972 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
2973 
2974 	return flush_imsg(ibuf);
2975 }
2976 
2977 const struct got_error *
2978 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
2979 {
2980 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
2981 }
2982 
2983 const struct got_error *
2984 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
2985     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
2986     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
2987 {
2988 	struct got_imsg_raw_delta idelta;
2989 	int ret;
2990 
2991 	memset(&idelta, 0, sizeof(idelta));
2992 	idelta.base_size = base_size;
2993 	idelta.result_size = result_size;
2994 	idelta.delta_size = delta_size;
2995 	idelta.delta_compressed_size = delta_compressed_size;
2996 	idelta.delta_offset = delta_offset;
2997 	idelta.delta_out_offset = delta_out_offset;
2998 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
2999 
3000 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3001 	    &idelta, sizeof(idelta));
3002 	if (ret == -1)
3003 		return got_error_from_errno("imsg_compose RAW_DELTA");
3004 
3005 	return flush_imsg(ibuf);
3006 }
3007 
3008 const struct got_error *
3009 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3010     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3011     off_t *delta_out_offset, struct got_object_id **base_id,
3012     struct imsgbuf *ibuf)
3013 {
3014 	const struct got_error *err = NULL;
3015 	struct imsg imsg;
3016 	struct got_imsg_raw_delta *delta;
3017 	size_t datalen;
3018 
3019 	*base_size = 0;
3020 	*result_size = 0;
3021 	*delta_size = 0;
3022 	*delta_compressed_size = 0;
3023 	*delta_offset = 0;
3024 	*delta_out_offset = 0;
3025 	*base_id = NULL;
3026 
3027 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3028 	if (err)
3029 		return err;
3030 
3031 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3032 
3033 	switch (imsg.hdr.type) {
3034 	case GOT_IMSG_RAW_DELTA:
3035 		if (datalen != sizeof(*delta)) {
3036 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3037 			break;
3038 		}
3039 		delta = imsg.data;
3040 		*base_size = delta->base_size;
3041 		*result_size = delta->result_size;
3042 		*delta_size = delta->delta_size;
3043 		*delta_compressed_size = delta->delta_compressed_size;
3044 		*delta_offset = delta->delta_offset;
3045 		*delta_out_offset = delta->delta_out_offset;
3046 		*base_id = calloc(1, sizeof(**base_id));
3047 		if (*base_id == NULL) {
3048 			err = got_error_from_errno("malloc");
3049 			break;
3050 		}
3051 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3052 		break;
3053 	default:
3054 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3055 		break;
3056 	}
3057 
3058 	imsg_free(&imsg);
3059 
3060 	if (err) {
3061 		free(*base_id);
3062 		*base_id = NULL;
3063 	}
3064 	return err;
3065 }
3066 
3067 static const struct got_error *
3068 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3069 {
3070 	const struct got_error *err = NULL;
3071 	struct got_imsg_object_idlist idlist;
3072 	struct ibuf *wbuf;
3073 	size_t i;
3074 
3075 	memset(&idlist, 0, sizeof(idlist));
3076 
3077 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3078 		return got_error(GOT_ERR_NO_SPACE);
3079 
3080 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3081 	    sizeof(idlist) + nids * sizeof(**ids));
3082 	if (wbuf == NULL) {
3083 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3084 		return err;
3085 	}
3086 
3087 	idlist.nids = nids;
3088 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3089 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3090 
3091 	for (i = 0; i < nids; i++) {
3092 		struct got_object_id *id = ids[i];
3093 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3094 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3095 	}
3096 
3097 	wbuf->fd = -1;
3098 	imsg_close(ibuf, wbuf);
3099 
3100 	return flush_imsg(ibuf);
3101 }
3102 
3103 const struct got_error *
3104 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3105     struct got_object_id **ids, size_t nids)
3106 {
3107 	const struct got_error *err = NULL;
3108 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3109 	int i, queued = 0;
3110 
3111 	for (i = 0; i < nids; i++) {
3112 		idlist[i % nitems(idlist)] = ids[i];
3113 		queued++;
3114 		if (queued >= nitems(idlist)) {
3115 			err = send_idlist(ibuf, idlist, queued);
3116 			if (err)
3117 				return err;
3118 			queued = 0;
3119 		}
3120 	}
3121 
3122 	if (queued > 0) {
3123 		err = send_idlist(ibuf, idlist, queued);
3124 		if (err)
3125 			return err;
3126 	}
3127 
3128 	return NULL;
3129 }
3130 
3131 const struct got_error *
3132 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3133 {
3134 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3135 	    == -1)
3136 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3137 
3138 	return flush_imsg(ibuf);
3139 }
3140 
3141 const struct got_error *
3142 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3143     size_t *nids, struct imsgbuf *ibuf)
3144 {
3145 	const struct got_error *err = NULL;
3146 	struct imsg imsg;
3147 	struct got_imsg_object_idlist *idlist;
3148 	size_t datalen;
3149 
3150 	*ids = NULL;
3151 	*done = 0;
3152 	*nids = 0;
3153 
3154 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3155 	if (err)
3156 		return err;
3157 
3158 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3159 	switch (imsg.hdr.type) {
3160 	case GOT_IMSG_OBJ_ID_LIST:
3161 		if (datalen < sizeof(*idlist)) {
3162 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3163 			break;
3164 		}
3165 		idlist = imsg.data;
3166 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3167 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3168 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3169 			break;
3170 		}
3171 		*nids = idlist->nids;
3172 		*ids = calloc(*nids, sizeof(**ids));
3173 		if (*ids == NULL) {
3174 			err = got_error_from_errno("calloc");
3175 			break;
3176 		}
3177 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3178 		    *nids * sizeof(**ids));
3179 		break;
3180 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3181 		*done = 1;
3182 		break;
3183 	default:
3184 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3185 		break;
3186 	}
3187 
3188 	imsg_free(&imsg);
3189 
3190 	return err;
3191 }
3192 
3193 const struct got_error *
3194 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3195 {
3196 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3197 	    == -1)
3198 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3199 
3200 	return flush_imsg(ibuf);
3201 }
3202 
3203 const struct got_error *
3204 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3205     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3206 {
3207 	const struct got_error *err = NULL;
3208 	struct ibuf *wbuf;
3209 	struct got_imsg_reused_deltas ideltas;
3210 	size_t i;
3211 
3212 	memset(&ideltas, 0, sizeof(ideltas));
3213 
3214 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3215 		return got_error(GOT_ERR_NO_SPACE);
3216 
3217 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3218 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3219 	if (wbuf == NULL) {
3220 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3221 		return err;
3222 	}
3223 
3224 	ideltas.ndeltas = ndeltas;
3225 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3226 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3227 
3228 	for (i = 0; i < ndeltas; i++) {
3229 		struct got_imsg_reused_delta *delta = &deltas[i];
3230 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3231 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3232 	}
3233 
3234 	wbuf->fd = -1;
3235 	imsg_close(ibuf, wbuf);
3236 
3237 	return flush_imsg(ibuf);
3238 }
3239 
3240 const struct got_error *
3241 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3242 {
3243 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3244 	    == -1)
3245 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3246 
3247 	return flush_imsg(ibuf);
3248 }
3249 
3250 const struct got_error *
3251 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3252     size_t *ndeltas, struct imsgbuf *ibuf)
3253 {
3254 	const struct got_error *err = NULL;
3255 	struct imsg imsg;
3256 	struct got_imsg_reused_deltas *ideltas;
3257 	size_t datalen;
3258 
3259 	*done = 0;
3260 	*ndeltas = 0;
3261 
3262 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3263 	if (err)
3264 		return err;
3265 
3266 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3267 	switch (imsg.hdr.type) {
3268 	case GOT_IMSG_REUSED_DELTAS:
3269 		if (datalen < sizeof(*ideltas)) {
3270 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3271 			break;
3272 		}
3273 		ideltas = imsg.data;
3274 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3275 		    ideltas->ndeltas * sizeof(*deltas) >
3276 		    datalen - sizeof(*ideltas)) {
3277 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3278 			break;
3279 		}
3280 		*ndeltas = ideltas->ndeltas;
3281 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3282 		    *ndeltas * sizeof(*deltas));
3283 		break;
3284 	case GOT_IMSG_DELTA_REUSE_DONE:
3285 		*done = 1;
3286 		break;
3287 	default:
3288 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3289 		break;
3290 	}
3291 
3292 	imsg_free(&imsg);
3293 
3294 	return err;
3295 }
3296 
3297 const struct got_error *
3298 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3299 {
3300 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3301 	    0, 0, -1, NULL, 0)
3302 	    == -1)
3303 		return got_error_from_errno("imsg_compose "
3304 		    "COMMIT_PAINTING_INIT");
3305 
3306 	return flush_imsg(ibuf);
3307 }
3308 
3309 const struct got_error *
3310 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3311     struct got_object_id *id, intptr_t color)
3312 {
3313 	struct got_imsg_commit_painting_request ireq;
3314 
3315 	memset(&ireq, 0, sizeof(ireq));
3316 	memcpy(ireq.id, id->hash, sizeof(ireq.id));
3317 	ireq.idx = idx;
3318 	ireq.color = color;
3319 
3320 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3321 	    &ireq, sizeof(ireq)) == -1)
3322 		return got_error_from_errno("imsg_compose "
3323 		    "COMMIT_PAINTING_REQUEST");
3324 
3325 	return flush_imsg(ibuf);
3326 }
3327 
3328 static const struct got_error *
3329 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3330     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3331 {
3332 	const struct got_error *err = NULL;
3333 	struct ibuf *wbuf = NULL;
3334 	struct got_object_qid *qid;
3335 	size_t msglen;
3336 	int ncommits;
3337 	intptr_t color;
3338 
3339 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3340 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3341 	    sizeof(struct got_imsg_painted_commit);
3342 
3343 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3344 	if (wbuf == NULL) {
3345 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3346 		return err;
3347 	}
3348 
3349 	/* Keep in sync with struct got_imsg_painted_commits! */
3350 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3351 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3352 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3353 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3354 
3355 	while (ncommits > 0) {
3356 		qid = STAILQ_FIRST(ids);
3357 		STAILQ_REMOVE_HEAD(ids, entry);
3358 		ncommits--;
3359 		(*nids)--;
3360 		color = (intptr_t)qid->data;
3361 
3362 		/* Keep in sync with struct got_imsg_painted_commit! */
3363 		if (imsg_add(wbuf, qid->id.hash, SHA1_DIGEST_LENGTH) == -1)
3364 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3365 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3366 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3367 
3368 		got_object_qid_free(qid);
3369 	}
3370 
3371 	wbuf->fd = -1;
3372 	imsg_close(ibuf, wbuf);
3373 
3374 	return flush_imsg(ibuf);
3375 }
3376 
3377 const struct got_error *
3378 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3379     struct got_object_id_queue *ids, int *nids,
3380     int present_in_pack, int flush)
3381 {
3382 	const struct got_error *err;
3383 	size_t remain;
3384 
3385 	if (*nids <= 0)
3386 		return NULL;
3387 
3388 	do {
3389 		remain = (sizeof(struct got_imsg_painted_commits)) +
3390 		    *nids * sizeof(struct got_imsg_painted_commit);
3391 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3392 			err = send_painted_commits(ids, nids, remain,
3393 			    present_in_pack, ibuf);
3394 			if (err)
3395 				return err;
3396 		}
3397 	} while (flush && *nids > 0);
3398 
3399 	return NULL;
3400 }
3401 
3402 const struct got_error *
3403 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3404 {
3405 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3406 	    0, 0, -1, NULL, 0)
3407 	    == -1)
3408 		return got_error_from_errno("imsg_compose "
3409 		    "COMMIT_PAINTING_DONE");
3410 
3411 	return flush_imsg(ibuf);
3412 }
3413 
3414 const struct got_error *
3415 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3416     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3417 {
3418 	const struct got_error *err = NULL;
3419 	struct imsg imsg;
3420 	struct got_imsg_painted_commits icommits;
3421 	struct got_imsg_painted_commit icommit;
3422 	size_t datalen;
3423 	int i;
3424 
3425 	for (;;) {
3426 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3427 		if (err)
3428 			return err;
3429 
3430 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3431 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3432 			break;
3433 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3434 			return got_error(GOT_ERR_PRIVSEP_MSG);
3435 
3436 		if (datalen < sizeof(icommits))
3437 			return got_error(GOT_ERR_PRIVSEP_LEN);
3438 		memcpy(&icommits, imsg.data, sizeof(icommits));
3439 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3440 		    datalen < sizeof(icommits) +
3441 		    icommits.ncommits * sizeof(icommit))
3442 			return got_error(GOT_ERR_PRIVSEP_LEN);
3443 
3444 		for (i = 0; i < icommits.ncommits; i++) {
3445 			memcpy(&icommit,
3446 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3447 			    sizeof(icommit));
3448 
3449 			if (icommits.present_in_pack) {
3450 				struct got_object_id id;
3451 				memcpy(id.hash, icommit.id, SHA1_DIGEST_LENGTH);
3452 				err = cb(cb_arg, &id, icommit.color);
3453 				if (err)
3454 					break;
3455 			} else {
3456 				struct got_object_qid *qid;
3457 				err = got_object_qid_alloc_partial(&qid);
3458 				if (err)
3459 					break;
3460 				memcpy(qid->id.hash, icommit.id,
3461 				    SHA1_DIGEST_LENGTH);
3462 				qid->data = (void *)icommit.color;
3463 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3464 			}
3465 		}
3466 
3467 		imsg_free(&imsg);
3468 	}
3469 
3470 	return err;
3471 }
3472 
3473 const struct got_error *
3474 got_privsep_unveil_exec_helpers(void)
3475 {
3476 	const char *helpers[] = {
3477 	    GOT_PATH_PROG_READ_PACK,
3478 	    GOT_PATH_PROG_READ_OBJECT,
3479 	    GOT_PATH_PROG_READ_COMMIT,
3480 	    GOT_PATH_PROG_READ_TREE,
3481 	    GOT_PATH_PROG_READ_BLOB,
3482 	    GOT_PATH_PROG_READ_TAG,
3483 	    GOT_PATH_PROG_READ_GITCONFIG,
3484 	    GOT_PATH_PROG_READ_GOTCONFIG,
3485 	    GOT_PATH_PROG_READ_PATCH,
3486 	    GOT_PATH_PROG_FETCH_PACK,
3487 	    GOT_PATH_PROG_INDEX_PACK,
3488 	    GOT_PATH_PROG_SEND_PACK,
3489 	};
3490 	size_t i;
3491 
3492 	for (i = 0; i < nitems(helpers); i++) {
3493 		if (unveil(helpers[i], "x") == 0)
3494 			continue;
3495 		return got_error_from_errno2("unveil", helpers[i]);
3496 	}
3497 
3498 	return NULL;
3499 }
3500 
3501 void
3502 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3503 {
3504 	if (close(imsg_fds[0]) == -1) {
3505 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3506 		_exit(1);
3507 	}
3508 
3509 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3510 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3511 		_exit(1);
3512 	}
3513 
3514 	closefrom(GOT_IMSG_FD_CHILD + 1);
3515 
3516 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3517 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3518 		    strerror(errno));
3519 		_exit(1);
3520 	}
3521 }