op public repos

Blob

Date:: Thu Feb 23 08:41:30 2023 UTC
Message:: rename lib/sha1.c to lib/hash.c It will soon grow functions to deal with sha256 too. stsp@ agrees.
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,
536     const char *worktree_branch, const char *remote_head,
537     int no_head, int verbosity)
538 {
539 	const struct got_error *err = NULL;
540 	struct ibuf *wbuf;
541 	struct got_pathlist_entry *pe;
542 	struct got_imsg_fetch_request fetchreq;
543 	size_t remote_head_len, worktree_branch_len, len = sizeof(fetchreq);
544 
545 	if (worktree_branch) {
546 		worktree_branch_len = strlen(worktree_branch);
547 		len += worktree_branch_len;
548 	}
549 	if (remote_head) {
550 		remote_head_len = strlen(remote_head);
551 		len += remote_head_len;
552 	}
553 
554 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
555 		close(fd);
556 		return got_error(GOT_ERR_NO_SPACE);
557 	}
558 
559 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
560 	if (wbuf == NULL)
561 		return got_error_from_errno("imsg_create FETCH_HAVE_REF");
562 
563 	memset(&fetchreq, 0, sizeof(fetchreq));
564 	fetchreq.no_head = no_head;
565 	fetchreq.fetch_all_branches = fetch_all_branches;
566 	fetchreq.list_refs_only = list_refs_only;
567 	fetchreq.verbosity = verbosity;
568 	if (worktree_branch != NULL)
569 		fetchreq.worktree_branch_len = worktree_branch_len;
570 	if (remote_head != NULL)
571 		fetchreq.remote_head_len = remote_head_len;
572 	TAILQ_FOREACH(pe, have_refs, entry)
573 		fetchreq.n_have_refs++;
574 	TAILQ_FOREACH(pe, wanted_branches, entry)
575 		fetchreq.n_wanted_branches++;
576 	TAILQ_FOREACH(pe, wanted_refs, entry)
577 		fetchreq.n_wanted_refs++;
578 	if (imsg_add(wbuf, &fetchreq, sizeof(fetchreq)) == -1)
579 		return got_error_from_errno("imsg_add FETCH_REQUEST");
580 	if (worktree_branch) {
581 		if (imsg_add(wbuf, worktree_branch, worktree_branch_len) == -1)
582 			return got_error_from_errno("imsg_add FETCH_REQUEST");
583 	}
584 	if (remote_head) {
585 		if (imsg_add(wbuf, remote_head, remote_head_len) == -1)
586 			return got_error_from_errno("imsg_add FETCH_REQUEST");
587 	}
588 	wbuf->fd = fd;
589 	imsg_close(ibuf, wbuf);
590 
591 	err = flush_imsg(ibuf);
592 	if (err) {
593 		close(fd);
594 		return err;
595 	}
596 	fd = -1;
597 
598 	TAILQ_FOREACH(pe, have_refs, entry) {
599 		const char *name = pe->path;
600 		size_t name_len = pe->path_len;
601 		struct got_object_id *id = pe->data;
602 
603 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
604 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
605 		if (wbuf == NULL)
606 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
607 
608 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
609 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
610 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
611 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
612 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
613 		if (imsg_add(wbuf, name, name_len) == -1)
614 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
615 
616 		wbuf->fd = -1;
617 		imsg_close(ibuf, wbuf);
618 		err = flush_imsg(ibuf);
619 		if (err)
620 			return err;
621 	}
622 
623 	TAILQ_FOREACH(pe, wanted_branches, entry) {
624 		const char *name = pe->path;
625 		size_t name_len = pe->path_len;
626 
627 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
628 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
629 		    len);
630 		if (wbuf == NULL)
631 			return got_error_from_errno(
632 			    "imsg_create FETCH_WANTED_BRANCH");
633 
634 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
635 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
636 			return got_error_from_errno(
637 			    "imsg_add FETCH_WANTED_BRANCH");
638 		if (imsg_add(wbuf, name, name_len) == -1)
639 			return got_error_from_errno(
640 			    "imsg_add FETCH_WANTED_BRANCH");
641 
642 		wbuf->fd = -1;
643 		imsg_close(ibuf, wbuf);
644 		err = flush_imsg(ibuf);
645 		if (err)
646 			return err;
647 	}
648 
649 	TAILQ_FOREACH(pe, wanted_refs, entry) {
650 		const char *name = pe->path;
651 		size_t name_len = pe->path_len;
652 
653 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
654 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
655 		    len);
656 		if (wbuf == NULL)
657 			return got_error_from_errno(
658 			    "imsg_create FETCH_WANTED_REF");
659 
660 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
661 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
662 			return got_error_from_errno(
663 			    "imsg_add FETCH_WANTED_REF");
664 		if (imsg_add(wbuf, name, name_len) == -1)
665 			return got_error_from_errno(
666 			    "imsg_add FETCH_WANTED_REF");
667 
668 		wbuf->fd = -1;
669 		imsg_close(ibuf, wbuf);
670 		err = flush_imsg(ibuf);
671 		if (err)
672 			return err;
673 	}
674 
675 
676 	return NULL;
677 
678 }
679 
680 const struct got_error *
681 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
682 {
683 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
684 }
685 
686 const struct got_error *
687 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
688     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
689     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
690 {
691 	const struct got_error *err = NULL;
692 	struct imsg imsg;
693 	size_t datalen;
694 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
695 	size_t n, remain;
696 	off_t off;
697 	int i;
698 
699 	*done = 0;
700 	*id = NULL;
701 	*refname = NULL;
702 	*server_progress = NULL;
703 	*packfile_size = 0;
704 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
705 
706 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
707 	if (err)
708 		return err;
709 
710 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
711 	switch (imsg.hdr.type) {
712 	case GOT_IMSG_FETCH_SYMREFS:
713 		if (datalen < sizeof(*isymrefs)) {
714 			err = got_error(GOT_ERR_PRIVSEP_LEN);
715 			break;
716 		}
717 		if (isymrefs != NULL) {
718 			err = got_error(GOT_ERR_PRIVSEP_MSG);
719 			break;
720 		}
721 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
722 		off = sizeof(*isymrefs);
723 		remain = datalen - off;
724 		for (n = 0; n < isymrefs->nsymrefs; n++) {
725 			struct got_imsg_fetch_symref *s;
726 			char *name, *target;
727 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
728 				err = got_error(GOT_ERR_PRIVSEP_LEN);
729 				goto done;
730 			}
731 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
732 			off += sizeof(*s);
733 			remain -= sizeof(*s);
734 			if (remain < s->name_len) {
735 				err = got_error(GOT_ERR_PRIVSEP_LEN);
736 				goto done;
737 			}
738 			name = strndup(imsg.data + off, s->name_len);
739 			if (name == NULL) {
740 				err = got_error_from_errno("strndup");
741 				goto done;
742 			}
743 			off += s->name_len;
744 			remain -= s->name_len;
745 			if (remain < s->target_len) {
746 				err = got_error(GOT_ERR_PRIVSEP_LEN);
747 				free(name);
748 				goto done;
749 			}
750 			target = strndup(imsg.data + off, s->target_len);
751 			if (target == NULL) {
752 				err = got_error_from_errno("strndup");
753 				free(name);
754 				goto done;
755 			}
756 			off += s->target_len;
757 			remain -= s->target_len;
758 			err = got_pathlist_append(symrefs, name, target);
759 			if (err) {
760 				free(name);
761 				free(target);
762 				goto done;
763 			}
764 		}
765 		break;
766 	case GOT_IMSG_FETCH_REF:
767 		if (datalen <= sizeof(**id)) {
768 			err = got_error(GOT_ERR_PRIVSEP_MSG);
769 			break;
770 		}
771 		*id = malloc(sizeof(**id));
772 		if (*id == NULL) {
773 			err = got_error_from_errno("malloc");
774 			break;
775 		}
776 		memcpy(*id, imsg.data, sizeof(**id));
777 		*refname = strndup(imsg.data + sizeof(**id),
778 		    datalen - sizeof(**id));
779 		if (*refname == NULL) {
780 			err = got_error_from_errno("strndup");
781 			break;
782 		}
783 		break;
784 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
785 		if (datalen == 0) {
786 			err = got_error(GOT_ERR_PRIVSEP_LEN);
787 			break;
788 		}
789 		*server_progress = strndup(imsg.data, datalen);
790 		if (*server_progress == NULL) {
791 			err = got_error_from_errno("strndup");
792 			break;
793 		}
794 		for (i = 0; i < datalen; i++) {
795 			if (!isprint((unsigned char)(*server_progress)[i]) &&
796 			    !isspace((unsigned char)(*server_progress)[i])) {
797 				err = got_error(GOT_ERR_PRIVSEP_MSG);
798 				free(*server_progress);
799 				*server_progress = NULL;
800 				goto done;
801 			}
802 		}
803 		break;
804 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
805 		if (datalen < sizeof(*packfile_size)) {
806 			err = got_error(GOT_ERR_PRIVSEP_MSG);
807 			break;
808 		}
809 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
810 		break;
811 	case GOT_IMSG_FETCH_DONE:
812 		if (datalen != SHA1_DIGEST_LENGTH) {
813 			err = got_error(GOT_ERR_PRIVSEP_MSG);
814 			break;
815 		}
816 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
817 		*done = 1;
818 		break;
819 	default:
820 		err = got_error(GOT_ERR_PRIVSEP_MSG);
821 		break;
822 	}
823 done:
824 	if (err) {
825 		free(*id);
826 		*id = NULL;
827 		free(*refname);
828 		*refname = NULL;
829 	}
830 	imsg_free(&imsg);
831 	return err;
832 }
833 
834 static const struct got_error *
835 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
836     int delete, struct imsgbuf *ibuf)
837 {
838 	size_t len;
839 	struct ibuf *wbuf;
840 
841 	len = sizeof(struct got_imsg_send_ref) + name_len;
842 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
843 	if (wbuf == NULL)
844 		return got_error_from_errno("imsg_create SEND_REF");
845 
846 	/* Keep in sync with struct got_imsg_send_ref! */
847 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
848 		return got_error_from_errno("imsg_add SEND_REF");
849 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
850 		return got_error_from_errno("imsg_add SEND_REF");
851 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
852 		return got_error_from_errno("imsg_add SEND_REF");
853 	if (imsg_add(wbuf, name, name_len) == -1)
854 		return got_error_from_errno("imsg_add SEND_REF");
855 
856 	wbuf->fd = -1;
857 	imsg_close(ibuf, wbuf);
858 	return flush_imsg(ibuf);
859 }
860 
861 const struct got_error *
862 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
863     struct got_pathlist_head *have_refs,
864     struct got_pathlist_head *delete_refs,
865     int verbosity)
866 {
867 	const struct got_error *err = NULL;
868 	struct got_pathlist_entry *pe;
869 	struct got_imsg_send_request sendreq;
870 	struct got_object_id zero_id;
871 
872 	memset(&zero_id, 0, sizeof(zero_id));
873 	memset(&sendreq, 0, sizeof(sendreq));
874 	sendreq.verbosity = verbosity;
875 	TAILQ_FOREACH(pe, have_refs, entry)
876 		sendreq.nrefs++;
877 	TAILQ_FOREACH(pe, delete_refs, entry)
878 		sendreq.nrefs++;
879 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
880 	    &sendreq, sizeof(sendreq)) == -1) {
881 		err = got_error_from_errno(
882 		    "imsg_compose FETCH_SERVER_PROGRESS");
883 		goto done;
884 	}
885 
886 	err = flush_imsg(ibuf);
887 	if (err)
888 		goto done;
889 	fd = -1;
890 
891 	TAILQ_FOREACH(pe, have_refs, entry) {
892 		const char *name = pe->path;
893 		size_t name_len = pe->path_len;
894 		struct got_object_id *id = pe->data;
895 		err = send_send_ref(name, name_len, id, 0, ibuf);
896 		if (err)
897 			goto done;
898 	}
899 
900 	TAILQ_FOREACH(pe, delete_refs, entry) {
901 		const char *name = pe->path;
902 		size_t name_len = pe->path_len;
903 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
904 		if (err)
905 			goto done;
906 	}
907 done:
908 	if (fd != -1 && close(fd) == -1 && err == NULL)
909 		err = got_error_from_errno("close");
910 	return err;
911 
912 }
913 
914 const struct got_error *
915 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
916     struct imsgbuf *ibuf)
917 {
918 	const struct got_error *err = NULL;
919 	struct imsg imsg;
920 	size_t datalen;
921 	int done = 0;
922 	struct got_imsg_send_remote_ref iremote_ref;
923 	struct got_object_id *id = NULL;
924 	char *refname = NULL;
925 	struct got_pathlist_entry *new;
926 
927 	while (!done) {
928 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
929 		if (err)
930 			return err;
931 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
932 		switch (imsg.hdr.type) {
933 		case GOT_IMSG_SEND_REMOTE_REF:
934 			if (datalen < sizeof(iremote_ref)) {
935 				err = got_error(GOT_ERR_PRIVSEP_MSG);
936 				goto done;
937 			}
938 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
939 			if (datalen != sizeof(iremote_ref) +
940 			    iremote_ref.name_len) {
941 				err = got_error(GOT_ERR_PRIVSEP_MSG);
942 				goto done;
943 			}
944 			id = malloc(sizeof(*id));
945 			if (id == NULL) {
946 				err = got_error_from_errno("malloc");
947 				goto done;
948 			}
949 			memcpy(id, &iremote_ref.id, sizeof(*id));
950 			refname = strndup(imsg.data + sizeof(iremote_ref),
951 			    datalen - sizeof(iremote_ref));
952 			if (refname == NULL) {
953 				err = got_error_from_errno("strndup");
954 				goto done;
955 			}
956 			err = got_pathlist_insert(&new, remote_refs,
957 			    refname, id);
958 			if (err)
959 				goto done;
960 			if (new == NULL) { /* duplicate which wasn't inserted */
961 				free(id);
962 				free(refname);
963 			}
964 			id = NULL;
965 			refname = NULL;
966 			break;
967 		case GOT_IMSG_SEND_PACK_REQUEST:
968 			if (datalen != 0) {
969 				err = got_error(GOT_ERR_PRIVSEP_MSG);
970 				goto done;
971 			}
972 			/* got-send-pack is now waiting for a pack file. */
973 			done = 1;
974 			break;
975 		default:
976 			err = got_error(GOT_ERR_PRIVSEP_MSG);
977 			break;
978 		}
979 	}
980 done:
981 	free(id);
982 	free(refname);
983 	imsg_free(&imsg);
984 	return err;
985 }
986 
987 const struct got_error *
988 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
989 {
990 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
991 }
992 
993 const struct got_error *
994 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
995     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
996 {
997 	const struct got_error *err = NULL;
998 	struct imsg imsg;
999 	size_t datalen;
1000 	struct got_imsg_send_ref_status iref_status;
1001 
1002 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1003 	*done = 0;
1004 	*success = 0;
1005 	*refname = NULL;
1006 	*errmsg = NULL;
1007 
1008 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1009 	if (err)
1010 		return err;
1011 
1012 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1013 	switch (imsg.hdr.type) {
1014 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1015 		if (datalen < sizeof(*bytes_sent)) {
1016 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1017 			break;
1018 		}
1019 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1020 		break;
1021 	case GOT_IMSG_SEND_REF_STATUS:
1022 		if (datalen < sizeof(iref_status)) {
1023 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1024 			break;
1025 		}
1026 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1027 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1028 		    iref_status.errmsg_len) {
1029 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1030 			break;
1031 		}
1032 		*success = iref_status.success;
1033 		*refname = strndup(imsg.data + sizeof(iref_status),
1034 		    iref_status.name_len);
1035 
1036 		if (iref_status.errmsg_len != 0)
1037 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1038 			    iref_status.name_len, iref_status.errmsg_len);
1039 		break;
1040 	case GOT_IMSG_SEND_DONE:
1041 		if (datalen != 0) {
1042 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1043 			break;
1044 		}
1045 		*done = 1;
1046 		break;
1047 	default:
1048 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1049 		break;
1050 	}
1051 
1052 	imsg_free(&imsg);
1053 	return err;
1054 }
1055 
1056 const struct got_error *
1057 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1058     int fd)
1059 {
1060 	const struct got_error *err = NULL;
1061 
1062 	/* Keep in sync with struct got_imsg_index_pack_request */
1063 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1064 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1065 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1066 		close(fd);
1067 		return err;
1068 	}
1069 	return flush_imsg(ibuf);
1070 }
1071 
1072 const struct got_error *
1073 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1074 {
1075 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1076 }
1077 
1078 const struct got_error *
1079 got_privsep_recv_index_progress(int *done, int *nobj_total,
1080     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1081     struct imsgbuf *ibuf)
1082 {
1083 	const struct got_error *err = NULL;
1084 	struct imsg imsg;
1085 	struct got_imsg_index_pack_progress *iprogress;
1086 	size_t datalen;
1087 
1088 	*done = 0;
1089 	*nobj_total = 0;
1090 	*nobj_indexed = 0;
1091 	*nobj_resolved = 0;
1092 
1093 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1094 	if (err)
1095 		return err;
1096 
1097 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1098 	switch (imsg.hdr.type) {
1099 	case GOT_IMSG_IDXPACK_PROGRESS:
1100 		if (datalen < sizeof(*iprogress)) {
1101 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1102 			break;
1103 		}
1104 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1105 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1106 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1107 			err = got_error(GOT_ERR_RANGE);
1108 			break;
1109 		}
1110 		*nobj_total = iprogress->nobj_total;
1111 		*nobj_indexed = iprogress->nobj_indexed;
1112 		*nobj_loose = iprogress->nobj_loose;
1113 		*nobj_resolved = iprogress->nobj_resolved;
1114 		break;
1115 	case GOT_IMSG_IDXPACK_DONE:
1116 		if (datalen != 0) {
1117 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1118 			break;
1119 		}
1120 		*done = 1;
1121 		break;
1122 	default:
1123 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1124 		break;
1125 	}
1126 
1127 	imsg_free(&imsg);
1128 	return err;
1129 }
1130 
1131 const struct got_error *
1132 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1133     struct imsgbuf *ibuf)
1134 {
1135 	struct got_imsg_object *iobj;
1136 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1137 
1138 	if (datalen != sizeof(*iobj))
1139 		return got_error(GOT_ERR_PRIVSEP_LEN);
1140 	iobj = imsg->data;
1141 
1142 	if (iobj->pack_offset < 0)
1143 		return got_error(GOT_ERR_PACK_OFFSET);
1144 
1145 	*obj = calloc(1, sizeof(**obj));
1146 	if (*obj == NULL)
1147 		return got_error_from_errno("calloc");
1148 
1149 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1150 	(*obj)->type = iobj->type;
1151 	(*obj)->flags = iobj->flags;
1152 	(*obj)->hdrlen = iobj->hdrlen;
1153 	(*obj)->size = iobj->size;
1154 	/* path_packfile is handled by caller */
1155 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1156 		(*obj)->pack_offset = iobj->pack_offset;
1157 		(*obj)->pack_idx = iobj->pack_idx;
1158 	}
1159 	STAILQ_INIT(&(*obj)->deltas.entries);
1160 	return NULL;
1161 }
1162 
1163 const struct got_error *
1164 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1165 {
1166 	const struct got_error *err = NULL;
1167 	struct imsg imsg;
1168 	const size_t min_datalen =
1169 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1170 
1171 	*obj = NULL;
1172 
1173 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1174 	if (err)
1175 		return err;
1176 
1177 	switch (imsg.hdr.type) {
1178 	case GOT_IMSG_OBJECT:
1179 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1180 		break;
1181 	default:
1182 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1183 		break;
1184 	}
1185 
1186 	imsg_free(&imsg);
1187 
1188 	return err;
1189 }
1190 
1191 static const struct got_error *
1192 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1193     size_t logmsg_len)
1194 {
1195 	const struct got_error *err = NULL;
1196 	size_t offset, remain;
1197 
1198 	offset = 0;
1199 	remain = logmsg_len;
1200 	while (remain > 0) {
1201 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1202 
1203 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1204 		    commit->logmsg + offset, n) == -1) {
1205 			err = got_error_from_errno("imsg_compose "
1206 			    "COMMIT_LOGMSG");
1207 			break;
1208 		}
1209 
1210 		err = flush_imsg(ibuf);
1211 		if (err)
1212 			break;
1213 
1214 		offset += n;
1215 		remain -= n;
1216 	}
1217 
1218 	return err;
1219 }
1220 
1221 const struct got_error *
1222 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1223 {
1224 	const struct got_error *err = NULL;
1225 	struct got_imsg_commit_object *icommit;
1226 	uint8_t *buf;
1227 	size_t len, total;
1228 	struct got_object_qid *qid;
1229 	size_t author_len = strlen(commit->author);
1230 	size_t committer_len = strlen(commit->committer);
1231 	size_t logmsg_len = strlen(commit->logmsg);
1232 
1233 	total = sizeof(*icommit) + author_len + committer_len +
1234 	    commit->nparents * sizeof(struct got_object_id);
1235 
1236 	buf = malloc(total);
1237 	if (buf == NULL)
1238 		return got_error_from_errno("malloc");
1239 
1240 	icommit = (struct got_imsg_commit_object *)buf;
1241 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1242 	icommit->author_len = author_len;
1243 	icommit->author_time = commit->author_time;
1244 	icommit->author_gmtoff = commit->author_gmtoff;
1245 	icommit->committer_len = committer_len;
1246 	icommit->committer_time = commit->committer_time;
1247 	icommit->committer_gmtoff = commit->committer_gmtoff;
1248 	icommit->logmsg_len = logmsg_len;
1249 	icommit->nparents = commit->nparents;
1250 
1251 	len = sizeof(*icommit);
1252 	memcpy(buf + len, commit->author, author_len);
1253 	len += author_len;
1254 	memcpy(buf + len, commit->committer, committer_len);
1255 	len += committer_len;
1256 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1257 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1258 		len += sizeof(qid->id);
1259 	}
1260 
1261 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1262 		err = got_error_from_errno("imsg_compose COMMIT");
1263 		goto done;
1264 	}
1265 
1266 	if (logmsg_len == 0 ||
1267 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1268 		err = flush_imsg(ibuf);
1269 		if (err)
1270 			goto done;
1271 	}
1272 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1273 done:
1274 	free(buf);
1275 	return err;
1276 }
1277 
1278 static const struct got_error *
1279 get_commit_from_imsg(struct got_commit_object **commit,
1280     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1281 {
1282 	const struct got_error *err = NULL;
1283 	struct got_imsg_commit_object *icommit;
1284 	size_t len = 0;
1285 	int i;
1286 
1287 	if (datalen < sizeof(*icommit))
1288 		return got_error(GOT_ERR_PRIVSEP_LEN);
1289 
1290 	icommit = imsg->data;
1291 	if (datalen != sizeof(*icommit) + icommit->author_len +
1292 	    icommit->committer_len +
1293 	    icommit->nparents * sizeof(struct got_object_id))
1294 		return got_error(GOT_ERR_PRIVSEP_LEN);
1295 
1296 	if (icommit->nparents < 0)
1297 		return got_error(GOT_ERR_PRIVSEP_LEN);
1298 
1299 	len += sizeof(*icommit);
1300 
1301 	*commit = got_object_commit_alloc_partial();
1302 	if (*commit == NULL)
1303 		return got_error_from_errno(
1304 		    "got_object_commit_alloc_partial");
1305 
1306 	memcpy((*commit)->tree_id, &icommit->tree_id,
1307 	    sizeof(icommit->tree_id));
1308 	(*commit)->author_time = icommit->author_time;
1309 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1310 	(*commit)->committer_time = icommit->committer_time;
1311 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1312 
1313 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1314 	if ((*commit)->author == NULL) {
1315 		err = got_error_from_errno("strndup");
1316 		goto done;
1317 	}
1318 	len += icommit->author_len;
1319 
1320 	(*commit)->committer = strndup(imsg->data + len,
1321 	    icommit->committer_len);
1322 	if ((*commit)->committer == NULL) {
1323 		err = got_error_from_errno("strndup");
1324 		goto done;
1325 	}
1326 	len += icommit->committer_len;
1327 
1328 	if (icommit->logmsg_len == 0) {
1329 		(*commit)->logmsg = strdup("");
1330 		if ((*commit)->logmsg == NULL) {
1331 			err = got_error_from_errno("strdup");
1332 			goto done;
1333 		}
1334 	} else {
1335 		size_t offset = 0, remain = icommit->logmsg_len;
1336 
1337 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1338 		if ((*commit)->logmsg == NULL) {
1339 			err = got_error_from_errno("malloc");
1340 			goto done;
1341 		}
1342 		while (remain > 0) {
1343 			struct imsg imsg_log;
1344 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1345 			    remain);
1346 
1347 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1348 			if (err)
1349 				goto done;
1350 
1351 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1352 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1353 				goto done;
1354 			}
1355 
1356 			memcpy((*commit)->logmsg + offset,
1357 			    imsg_log.data, n);
1358 			imsg_free(&imsg_log);
1359 			offset += n;
1360 			remain -= n;
1361 		}
1362 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1363 	}
1364 
1365 	for (i = 0; i < icommit->nparents; i++) {
1366 		struct got_object_qid *qid;
1367 
1368 		err = got_object_qid_alloc_partial(&qid);
1369 		if (err)
1370 			break;
1371 		memcpy(&qid->id, imsg->data + len +
1372 		    i * sizeof(qid->id), sizeof(qid->id));
1373 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1374 		(*commit)->nparents++;
1375 	}
1376 done:
1377 	if (err) {
1378 		got_object_commit_close(*commit);
1379 		*commit = NULL;
1380 	}
1381 	return err;
1382 }
1383 
1384 const struct got_error *
1385 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1386 {
1387 	const struct got_error *err = NULL;
1388 	struct imsg imsg;
1389 	size_t datalen;
1390 	const size_t min_datalen =
1391 	    MIN(sizeof(struct got_imsg_error),
1392 	    sizeof(struct got_imsg_commit_object));
1393 
1394 	*commit = NULL;
1395 
1396 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1397 	if (err)
1398 		return err;
1399 
1400 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1401 
1402 	switch (imsg.hdr.type) {
1403 	case GOT_IMSG_COMMIT:
1404 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1405 		break;
1406 	default:
1407 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1408 		break;
1409 	}
1410 
1411 	imsg_free(&imsg);
1412 
1413 	return err;
1414 }
1415 
1416 static const struct got_error *
1417 send_tree_entries_batch(struct imsgbuf *ibuf,
1418     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1419 {
1420 	struct ibuf *wbuf;
1421 	struct got_imsg_tree_entries ientries;
1422 	int i;
1423 
1424 	memset(&ientries, 0, sizeof(ientries));
1425 
1426 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1427 	if (wbuf == NULL)
1428 		return got_error_from_errno("imsg_create TREE_ENTRY");
1429 
1430 	ientries.nentries = idxN - idx0 + 1;
1431 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1432 		return got_error_from_errno("imsg_add TREE_ENTRY");
1433 
1434 	for (i = idx0; i <= idxN; i++) {
1435 		struct got_parsed_tree_entry *pte = &entries[i];
1436 
1437 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1438 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1439 			return got_error_from_errno("imsg_add TREE_ENTRY");
1440 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1441 			return got_error_from_errno("imsg_add TREE_ENTRY");
1442 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1443 			return got_error_from_errno("imsg_add TREE_ENTRY");
1444 
1445 		/* Remaining bytes are the entry's name. */
1446 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1447 			return got_error_from_errno("imsg_add TREE_ENTRY");
1448 	}
1449 
1450 	wbuf->fd = -1;
1451 	imsg_close(ibuf, wbuf);
1452 	return NULL;
1453 }
1454 
1455 static const struct got_error *
1456 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1457     int nentries)
1458 {
1459 	const struct got_error *err = NULL;
1460 	int i, j;
1461 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1462 
1463 	i = 0;
1464 	for (j = 0; j < nentries; j++) {
1465 		struct got_parsed_tree_entry *pte = &entries[j];
1466 		size_t len = sizeof(struct got_imsg_tree_entry) + pte->namelen;
1467 
1468 		if (j > 0 &&
1469 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1470 			err = send_tree_entries_batch(ibuf, entries,
1471 			    i, j - 1, entries_len);
1472 			if (err)
1473 				return err;
1474 			i = j;
1475 			entries_len = sizeof(struct got_imsg_tree_entries);
1476 		}
1477 
1478 		entries_len += len;
1479 	}
1480 
1481 	if (j > 0) {
1482 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1483 		    entries_len);
1484 		if (err)
1485 			return err;
1486 	}
1487 
1488 	return NULL;
1489 }
1490 
1491 const struct got_error *
1492 got_privsep_send_tree(struct imsgbuf *ibuf,
1493     struct got_parsed_tree_entry *entries, int nentries)
1494 {
1495 	const struct got_error *err = NULL;
1496 	struct got_imsg_tree_object itree;
1497 
1498 	memset(&itree, 0, sizeof(itree));
1499 	itree.nentries = nentries;
1500 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1501 	    == -1)
1502 		return got_error_from_errno("imsg_compose TREE");
1503 
1504 	err = send_tree_entries(ibuf, entries, nentries);
1505 	if (err)
1506 		return err;
1507 
1508 	return flush_imsg(ibuf);
1509 }
1510 
1511 
1512 static const struct got_error *
1513 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1514     int *nentries)
1515 {
1516 	const struct got_error *err = NULL;
1517 	struct got_imsg_tree_entries *ientries;
1518 	struct got_tree_entry *te;
1519 	size_t te_offset;
1520 	size_t i;
1521 
1522 	if (datalen <= sizeof(*ientries) ||
1523 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1524 		return got_error(GOT_ERR_PRIVSEP_LEN);
1525 
1526 	ientries = (struct got_imsg_tree_entries *)data;
1527 	if (ientries->nentries > INT_MAX) {
1528 		return got_error_msg(GOT_ERR_NO_SPACE,
1529 		    "too many tree entries");
1530 	}
1531 
1532 	te_offset = sizeof(*ientries);
1533 	for (i = 0; i < ientries->nentries; i++) {
1534 		struct got_imsg_tree_entry ite;
1535 		const char *te_name;
1536 		uint8_t *buf = (uint8_t *)data + te_offset;
1537 
1538 		if (te_offset >= datalen) {
1539 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1540 			break;
1541 		}
1542 
1543 		/* Might not be aligned, size is ~32 bytes. */
1544 		memcpy(&ite, buf, sizeof(ite));
1545 
1546 		if (ite.namelen >= sizeof(te->name)) {
1547 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1548 			break;
1549 		}
1550 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1551 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1552 			break;
1553 		}
1554 
1555 		if (*nentries >= tree->nentries) {
1556 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1557 			break;
1558 		}
1559 		te = &tree->entries[*nentries];
1560 		te_name = buf + sizeof(ite);
1561 		memcpy(te->name, te_name, ite.namelen);
1562 		te->name[ite.namelen] = '\0';
1563 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1564 		te->mode = ite.mode;
1565 		te->idx = *nentries;
1566 		(*nentries)++;
1567 
1568 		te_offset += sizeof(ite) + ite.namelen;
1569 	}
1570 
1571 	return err;
1572 }
1573 
1574 const struct got_error *
1575 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1576 {
1577 	const struct got_error *err = NULL;
1578 	const size_t min_datalen =
1579 	    MIN(sizeof(struct got_imsg_error),
1580 	    sizeof(struct got_imsg_tree_object));
1581 	struct got_imsg_tree_object *itree;
1582 	int nentries = 0;
1583 
1584 	*tree = NULL;
1585 
1586 	while (*tree == NULL || nentries < (*tree)->nentries) {
1587 		struct imsg imsg;
1588 		size_t datalen;
1589 
1590 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1591 		if (err)
1592 			break;
1593 
1594 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1595 
1596 		switch (imsg.hdr.type) {
1597 		case GOT_IMSG_TREE:
1598 			/* This message should only appear once. */
1599 			if (*tree != NULL) {
1600 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1601 				break;
1602 			}
1603 			if (datalen != sizeof(*itree)) {
1604 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1605 				break;
1606 			}
1607 			itree = imsg.data;
1608 			if (itree->nentries < 0) {
1609 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1610 				break;
1611 			}
1612 			*tree = malloc(sizeof(**tree));
1613 			if (*tree == NULL) {
1614 				err = got_error_from_errno("malloc");
1615 				break;
1616 			}
1617 			(*tree)->entries = calloc(itree->nentries,
1618 			    sizeof(struct got_tree_entry));
1619 			if ((*tree)->entries == NULL) {
1620 				err = got_error_from_errno("malloc");
1621 				free(*tree);
1622 				*tree = NULL;
1623 				break;
1624 			}
1625 			(*tree)->nentries = itree->nentries;
1626 			(*tree)->refcnt = 0;
1627 			break;
1628 		case GOT_IMSG_TREE_ENTRIES:
1629 			/* This message should be preceeded by GOT_IMSG_TREE. */
1630 			if (*tree == NULL) {
1631 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1632 				break;
1633 			}
1634 			err = recv_tree_entries(imsg.data, datalen,
1635 			    *tree, &nentries);
1636 			break;
1637 		default:
1638 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1639 			break;
1640 		}
1641 
1642 		imsg_free(&imsg);
1643 		if (err)
1644 			break;
1645 	}
1646 
1647 	if (*tree && (*tree)->nentries != nentries) {
1648 		if (err == NULL)
1649 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1650 		got_object_tree_close(*tree);
1651 		*tree = NULL;
1652 	}
1653 
1654 	return err;
1655 }
1656 
1657 const struct got_error *
1658 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1659     const uint8_t *data)
1660 {
1661 	struct got_imsg_blob iblob;
1662 
1663 	memset(&iblob, 0, sizeof(iblob));
1664 	iblob.size = size;
1665 	iblob.hdrlen = hdrlen;
1666 
1667 	if (data) {
1668 		uint8_t *buf;
1669 
1670 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1671 			return got_error(GOT_ERR_NO_SPACE);
1672 
1673 		buf = malloc(sizeof(iblob) + size);
1674 		if (buf == NULL)
1675 			return got_error_from_errno("malloc");
1676 
1677 		memcpy(buf, &iblob, sizeof(iblob));
1678 		memcpy(buf + sizeof(iblob), data, size);
1679 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1680 		    sizeof(iblob) + size) == -1) {
1681 			free(buf);
1682 			return got_error_from_errno("imsg_compose BLOB");
1683 		}
1684 		free(buf);
1685 	} else {
1686 		/* Data has already been written to file descriptor. */
1687 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1688 		    sizeof(iblob)) == -1)
1689 			return got_error_from_errno("imsg_compose BLOB");
1690 	}
1691 
1692 
1693 	return flush_imsg(ibuf);
1694 }
1695 
1696 const struct got_error *
1697 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1698     struct imsgbuf *ibuf)
1699 {
1700 	const struct got_error *err = NULL;
1701 	struct imsg imsg;
1702 	struct got_imsg_blob *iblob;
1703 	size_t datalen;
1704 
1705 	*outbuf = NULL;
1706 
1707 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1708 	if (err)
1709 		return err;
1710 
1711 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1712 
1713 	switch (imsg.hdr.type) {
1714 	case GOT_IMSG_BLOB:
1715 		if (datalen < sizeof(*iblob)) {
1716 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1717 			break;
1718 		}
1719 		iblob = imsg.data;
1720 		*size = iblob->size;
1721 		*hdrlen = iblob->hdrlen;
1722 
1723 		if (datalen == sizeof(*iblob)) {
1724 			/* Data has been written to file descriptor. */
1725 			break;
1726 		}
1727 
1728 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1729 		    *size > datalen + sizeof(*iblob)) {
1730 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1731 			break;
1732 		}
1733 
1734 		*outbuf = malloc(*size);
1735 		if (*outbuf == NULL) {
1736 			err = got_error_from_errno("malloc");
1737 			break;
1738 		}
1739 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1740 		break;
1741 	default:
1742 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1743 		break;
1744 	}
1745 
1746 	imsg_free(&imsg);
1747 
1748 	return err;
1749 }
1750 
1751 static const struct got_error *
1752 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1753 {
1754 	const struct got_error *err = NULL;
1755 	size_t offset, remain;
1756 
1757 	offset = 0;
1758 	remain = tagmsg_len;
1759 	while (remain > 0) {
1760 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1761 
1762 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1763 		    tag->tagmsg + offset, n) == -1) {
1764 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1765 			break;
1766 		}
1767 
1768 		err = flush_imsg(ibuf);
1769 		if (err)
1770 			break;
1771 
1772 		offset += n;
1773 		remain -= n;
1774 	}
1775 
1776 	return err;
1777 }
1778 
1779 const struct got_error *
1780 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1781 {
1782 	const struct got_error *err = NULL;
1783 	struct got_imsg_tag_object *itag;
1784 	uint8_t *buf;
1785 	size_t len, total;
1786 	size_t tag_len = strlen(tag->tag);
1787 	size_t tagger_len = strlen(tag->tagger);
1788 	size_t tagmsg_len = strlen(tag->tagmsg);
1789 
1790 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1791 
1792 	buf = malloc(total);
1793 	if (buf == NULL)
1794 		return got_error_from_errno("malloc");
1795 
1796 	itag = (struct got_imsg_tag_object *)buf;
1797 	memcpy(&itag->id, &tag->id, sizeof(itag->id));
1798 	itag->obj_type = tag->obj_type;
1799 	itag->tag_len = tag_len;
1800 	itag->tagger_len = tagger_len;
1801 	itag->tagger_time = tag->tagger_time;
1802 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1803 	itag->tagmsg_len = tagmsg_len;
1804 
1805 	len = sizeof(*itag);
1806 	memcpy(buf + len, tag->tag, tag_len);
1807 	len += tag_len;
1808 	memcpy(buf + len, tag->tagger, tagger_len);
1809 	len += tagger_len;
1810 
1811 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1812 		err = got_error_from_errno("imsg_compose TAG");
1813 		goto done;
1814 	}
1815 
1816 	if (tagmsg_len == 0 ||
1817 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1818 		err = flush_imsg(ibuf);
1819 		if (err)
1820 			goto done;
1821 	}
1822 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1823 done:
1824 	free(buf);
1825 	return err;
1826 }
1827 
1828 const struct got_error *
1829 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1830 {
1831 	const struct got_error *err = NULL;
1832 	struct imsg imsg;
1833 	struct got_imsg_tag_object *itag;
1834 	size_t len, datalen;
1835 	const size_t min_datalen =
1836 	    MIN(sizeof(struct got_imsg_error),
1837 	    sizeof(struct got_imsg_tag_object));
1838 
1839 	*tag = NULL;
1840 
1841 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1842 	if (err)
1843 		return err;
1844 
1845 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1846 	len = 0;
1847 
1848 	switch (imsg.hdr.type) {
1849 	case GOT_IMSG_TAG:
1850 		if (datalen < sizeof(*itag)) {
1851 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1852 			break;
1853 		}
1854 		itag = imsg.data;
1855 		if (datalen != sizeof(*itag) + itag->tag_len +
1856 		    itag->tagger_len) {
1857 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1858 			break;
1859 		}
1860 		len += sizeof(*itag);
1861 
1862 		*tag = calloc(1, sizeof(**tag));
1863 		if (*tag == NULL) {
1864 			err = got_error_from_errno("calloc");
1865 			break;
1866 		}
1867 
1868 		memcpy(&(*tag)->id, &itag->id, sizeof(itag->id));
1869 
1870 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1871 		if ((*tag)->tag == NULL) {
1872 			err = got_error_from_errno("strndup");
1873 			break;
1874 		}
1875 		len += itag->tag_len;
1876 
1877 		(*tag)->obj_type = itag->obj_type;
1878 		(*tag)->tagger_time = itag->tagger_time;
1879 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1880 
1881 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1882 		if ((*tag)->tagger == NULL) {
1883 			err = got_error_from_errno("strndup");
1884 			break;
1885 		}
1886 		len += itag->tagger_len;
1887 
1888 		if (itag->tagmsg_len == 0) {
1889 			(*tag)->tagmsg = strdup("");
1890 			if ((*tag)->tagmsg == NULL) {
1891 				err = got_error_from_errno("strdup");
1892 				break;
1893 			}
1894 		} else {
1895 			size_t offset = 0, remain = itag->tagmsg_len;
1896 
1897 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1898 			if ((*tag)->tagmsg == NULL) {
1899 				err = got_error_from_errno("malloc");
1900 				break;
1901 			}
1902 			while (remain > 0) {
1903 				struct imsg imsg_log;
1904 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1905 				    remain);
1906 
1907 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1908 				if (err)
1909 					return err;
1910 
1911 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1912 					return got_error(GOT_ERR_PRIVSEP_MSG);
1913 
1914 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1915 				    n);
1916 				imsg_free(&imsg_log);
1917 				offset += n;
1918 				remain -= n;
1919 			}
1920 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1921 		}
1922 
1923 		break;
1924 	default:
1925 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1926 		break;
1927 	}
1928 
1929 	imsg_free(&imsg);
1930 
1931 	return err;
1932 }
1933 
1934 const struct got_error *
1935 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1936     struct got_packidx *packidx)
1937 {
1938 	const struct got_error *err = NULL;
1939 	struct got_imsg_packidx ipackidx;
1940 	struct got_imsg_pack ipack;
1941 	int fd;
1942 
1943 	memset(&ipackidx, 0, sizeof(ipackidx));
1944 	memset(&ipack, 0, sizeof(ipack));
1945 
1946 	ipackidx.len = packidx->len;
1947 	ipackidx.packfile_size = pack->filesize;
1948 	fd = dup(packidx->fd);
1949 	if (fd == -1)
1950 		return got_error_from_errno("dup");
1951 
1952 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1953 	    sizeof(ipackidx)) == -1) {
1954 		err = got_error_from_errno("imsg_compose PACKIDX");
1955 		close(fd);
1956 		return err;
1957 	}
1958 
1959 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1960 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1961 		return got_error(GOT_ERR_NO_SPACE);
1962 	ipack.filesize = pack->filesize;
1963 
1964 	fd = dup(pack->fd);
1965 	if (fd == -1)
1966 		return got_error_from_errno("dup");
1967 
1968 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1969 	    == -1) {
1970 		err = got_error_from_errno("imsg_compose PACK");
1971 		close(fd);
1972 		return err;
1973 	}
1974 
1975 	return flush_imsg(ibuf);
1976 }
1977 
1978 const struct got_error *
1979 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1980     struct got_object_id *id)
1981 {
1982 	struct got_imsg_packed_object iobj;
1983 
1984 	memset(&iobj, 0, sizeof(iobj));
1985 	iobj.idx = idx;
1986 	memcpy(&iobj.id, id, sizeof(iobj.id));
1987 
1988 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1989 	    &iobj, sizeof(iobj)) == -1)
1990 		return got_error_from_errno("imsg_compose "
1991 		    "PACKED_OBJECT_REQUEST");
1992 
1993 	return flush_imsg(ibuf);
1994 }
1995 
1996 const struct got_error *
1997 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1998     struct got_object_id *id)
1999 {
2000 	struct got_imsg_packed_object iobj;
2001 
2002 	memset(&iobj, 0, sizeof(iobj));
2003 	iobj.idx = idx;
2004 	memcpy(&iobj.id, id, sizeof(iobj.id));
2005 
2006 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2007 	    &iobj, sizeof(iobj)) == -1)
2008 		return got_error_from_errno("imsg_compose "
2009 		    "PACKED_OBJECT_REQUEST");
2010 
2011 	return flush_imsg(ibuf);
2012 }
2013 
2014 const struct got_error *
2015 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2016 {
2017 	const struct got_error *err = NULL;
2018 
2019 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2020 	    NULL, 0) == -1) {
2021 		err = got_error_from_errno("imsg_compose "
2022 		    "GITCONFIG_PARSE_REQUEST");
2023 		close(fd);
2024 		return err;
2025 	}
2026 
2027 	return flush_imsg(ibuf);
2028 }
2029 
2030 const struct got_error *
2031 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2032 {
2033 	if (imsg_compose(ibuf,
2034 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2035 	    NULL, 0) == -1)
2036 		return got_error_from_errno("imsg_compose "
2037 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2038 
2039 	return flush_imsg(ibuf);
2040 }
2041 
2042 const struct got_error *
2043 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2044 {
2045 	if (imsg_compose(ibuf,
2046 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2047 	    NULL, 0) == -1)
2048 		return got_error_from_errno("imsg_compose "
2049 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2050 
2051 	return flush_imsg(ibuf);
2052 }
2053 
2054 
2055 const struct got_error *
2056 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2057 {
2058 	if (imsg_compose(ibuf,
2059 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2060 		return got_error_from_errno("imsg_compose "
2061 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2062 
2063 	return flush_imsg(ibuf);
2064 }
2065 
2066 const struct got_error *
2067 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2068 {
2069 	if (imsg_compose(ibuf,
2070 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2071 		return got_error_from_errno("imsg_compose "
2072 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2073 
2074 	return flush_imsg(ibuf);
2075 }
2076 
2077 const struct got_error *
2078 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2079 {
2080 	if (imsg_compose(ibuf,
2081 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2082 		return got_error_from_errno("imsg_compose "
2083 		    "GITCONFIG_REMOTE_REQUEST");
2084 
2085 	return flush_imsg(ibuf);
2086 }
2087 
2088 const struct got_error *
2089 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2090 {
2091 	if (imsg_compose(ibuf,
2092 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2093 		return got_error_from_errno("imsg_compose "
2094 		    "GITCONFIG_OWNER_REQUEST");
2095 
2096 	return flush_imsg(ibuf);
2097 }
2098 
2099 const struct got_error *
2100 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2101 {
2102 	const struct got_error *err = NULL;
2103 	struct imsg imsg;
2104 	size_t datalen;
2105 
2106 	*str = NULL;
2107 
2108 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2109 	if (err)
2110 		return err;
2111 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2112 
2113 	switch (imsg.hdr.type) {
2114 	case GOT_IMSG_GITCONFIG_STR_VAL:
2115 		if (datalen == 0)
2116 			break;
2117 		*str = strndup(imsg.data, datalen);
2118 		if (*str == NULL) {
2119 			err = got_error_from_errno("strndup");
2120 			break;
2121 		}
2122 		break;
2123 	default:
2124 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2125 		break;
2126 	}
2127 
2128 	imsg_free(&imsg);
2129 	return err;
2130 }
2131 
2132 const struct got_error *
2133 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2134 {
2135 	const struct got_error *err = NULL;
2136 	struct got_imsg_gitconfig_pair p;
2137 	struct imsg imsg;
2138 	size_t datalen;
2139 	uint8_t *data;
2140 
2141 	*key = *val = NULL;
2142 
2143 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2144 	if (err)
2145 		return err;
2146 
2147 	data = imsg.data;
2148 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2149 
2150 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2151 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2152 		goto done;
2153 	}
2154 
2155 	if (datalen < sizeof(p)) {
2156 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2157 		goto done;
2158 	}
2159 
2160 	memcpy(&p, data, sizeof(p));
2161 	data += sizeof(p);
2162 
2163 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2164 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2165 		goto done;
2166 	}
2167 
2168 	*key = strndup(data, p.klen);
2169 	if (*key == NULL) {
2170 		err = got_error_from_errno("strndup");
2171 		goto done;
2172 	}
2173 	data += p.klen;
2174 
2175 	*val = strndup(data, p.vlen);
2176 	if (*val == NULL) {
2177 		err = got_error_from_errno("strndup");
2178 		goto done;
2179 	}
2180 
2181 done:
2182 	imsg_free(&imsg);
2183 	return err;
2184 }
2185 
2186 const struct got_error *
2187 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2188 {
2189 	const struct got_error *err = NULL;
2190 	struct imsg imsg;
2191 	size_t datalen;
2192 	const size_t min_datalen =
2193 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2194 
2195 	*val = 0;
2196 
2197 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2198 	if (err)
2199 		return err;
2200 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2201 
2202 	switch (imsg.hdr.type) {
2203 	case GOT_IMSG_GITCONFIG_INT_VAL:
2204 		if (datalen != sizeof(*val)) {
2205 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2206 			break;
2207 		}
2208 		memcpy(val, imsg.data, sizeof(*val));
2209 		break;
2210 	default:
2211 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2212 		break;
2213 	}
2214 
2215 	imsg_free(&imsg);
2216 	return err;
2217 }
2218 
2219 static void
2220 free_remote_data(struct got_remote_repo *remote)
2221 {
2222 	int i;
2223 
2224 	free(remote->name);
2225 	free(remote->fetch_url);
2226 	free(remote->send_url);
2227 	for (i = 0; i < remote->nfetch_branches; i++)
2228 		free(remote->fetch_branches[i]);
2229 	free(remote->fetch_branches);
2230 	for (i = 0; i < remote->nsend_branches; i++)
2231 		free(remote->send_branches[i]);
2232 	free(remote->send_branches);
2233 	for (i = 0; i < remote->nfetch_refs; i++)
2234 		free(remote->fetch_refs[i]);
2235 	free(remote->fetch_refs);
2236 }
2237 
2238 const struct got_error *
2239 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2240     int *nremotes, struct imsgbuf *ibuf)
2241 {
2242 	const struct got_error *err = NULL;
2243 	struct imsg imsg;
2244 	size_t datalen;
2245 	struct got_imsg_remotes iremotes;
2246 	struct got_imsg_remote iremote;
2247 
2248 	*remotes = NULL;
2249 	*nremotes = 0;
2250 	iremotes.nremotes = 0;
2251 
2252 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2253 	if (err)
2254 		return err;
2255 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2256 
2257 	switch (imsg.hdr.type) {
2258 	case GOT_IMSG_GITCONFIG_REMOTES:
2259 		if (datalen != sizeof(iremotes)) {
2260 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2261 			break;
2262 		}
2263 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2264 		if (iremotes.nremotes == 0) {
2265 			imsg_free(&imsg);
2266 			return NULL;
2267 		}
2268 		break;
2269 	default:
2270 		imsg_free(&imsg);
2271 		return got_error(GOT_ERR_PRIVSEP_MSG);
2272 	}
2273 
2274 	imsg_free(&imsg);
2275 
2276 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2277 	if (*remotes == NULL)
2278 		return got_error_from_errno("recallocarray");
2279 
2280 	while (*nremotes < iremotes.nremotes) {
2281 		struct got_remote_repo *remote;
2282 
2283 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2284 		if (err)
2285 			break;
2286 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2287 
2288 		switch (imsg.hdr.type) {
2289 		case GOT_IMSG_GITCONFIG_REMOTE:
2290 			remote = &(*remotes)[*nremotes];
2291 			memset(remote, 0, sizeof(*remote));
2292 			if (datalen < sizeof(iremote)) {
2293 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2294 				break;
2295 			}
2296 			memcpy(&iremote, imsg.data, sizeof(iremote));
2297 			if (iremote.name_len == 0 ||
2298 			    iremote.fetch_url_len == 0 ||
2299 			    iremote.send_url_len == 0 ||
2300 			    (sizeof(iremote) + iremote.name_len +
2301 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2302 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2303 				break;
2304 			}
2305 			remote->name = strndup(imsg.data + sizeof(iremote),
2306 			    iremote.name_len);
2307 			if (remote->name == NULL) {
2308 				err = got_error_from_errno("strndup");
2309 				break;
2310 			}
2311 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2312 			    iremote.name_len, iremote.fetch_url_len);
2313 			if (remote->fetch_url == NULL) {
2314 				err = got_error_from_errno("strndup");
2315 				free_remote_data(remote);
2316 				break;
2317 			}
2318 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2319 			    iremote.name_len + iremote.fetch_url_len,
2320 			    iremote.send_url_len);
2321 			if (remote->send_url == NULL) {
2322 				err = got_error_from_errno("strndup");
2323 				free_remote_data(remote);
2324 				break;
2325 			}
2326 			remote->mirror_references = iremote.mirror_references;
2327 			remote->fetch_all_branches = iremote.fetch_all_branches;
2328 			remote->nfetch_branches = 0;
2329 			remote->fetch_branches = NULL;
2330 			remote->nsend_branches = 0;
2331 			remote->send_branches = NULL;
2332 			remote->nfetch_refs = 0;
2333 			remote->fetch_refs = NULL;
2334 			(*nremotes)++;
2335 			break;
2336 		default:
2337 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2338 			break;
2339 		}
2340 
2341 		imsg_free(&imsg);
2342 		if (err)
2343 			break;
2344 	}
2345 
2346 	if (err) {
2347 		int i;
2348 		for (i = 0; i < *nremotes; i++)
2349 			free_remote_data(&(*remotes)[i]);
2350 		free(*remotes);
2351 		*remotes = NULL;
2352 		*nremotes = 0;
2353 	}
2354 	return err;
2355 }
2356 
2357 const struct got_error *
2358 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2359 {
2360 	const struct got_error *err = NULL;
2361 
2362 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2363 	    NULL, 0) == -1) {
2364 		err = got_error_from_errno("imsg_compose "
2365 		    "GOTCONFIG_PARSE_REQUEST");
2366 		close(fd);
2367 		return err;
2368 	}
2369 
2370 	return flush_imsg(ibuf);
2371 }
2372 
2373 const struct got_error *
2374 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2375 {
2376 	if (imsg_compose(ibuf,
2377 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2378 		return got_error_from_errno("imsg_compose "
2379 		    "GOTCONFIG_AUTHOR_REQUEST");
2380 
2381 	return flush_imsg(ibuf);
2382 }
2383 
2384 const struct got_error *
2385 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2386 {
2387 	if (imsg_compose(ibuf,
2388 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2389 		return got_error_from_errno("imsg_compose "
2390 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2391 
2392 	return flush_imsg(ibuf);
2393 }
2394 
2395 const struct got_error *
2396 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2397 {
2398 	if (imsg_compose(ibuf,
2399 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2400 		return got_error_from_errno("imsg_compose "
2401 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2402 
2403 	return flush_imsg(ibuf);
2404 }
2405 
2406 const struct got_error *
2407 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2408 {
2409 	if (imsg_compose(ibuf,
2410 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2411 		return got_error_from_errno("imsg_compose "
2412 		    "GOTCONFIG_SIGNERID_REQUEST");
2413 
2414 	return flush_imsg(ibuf);
2415 }
2416 
2417 const struct got_error *
2418 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2419 {
2420 	if (imsg_compose(ibuf,
2421 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2422 		return got_error_from_errno("imsg_compose "
2423 		    "GOTCONFIG_REMOTE_REQUEST");
2424 
2425 	return flush_imsg(ibuf);
2426 }
2427 
2428 const struct got_error *
2429 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2430 {
2431 	const struct got_error *err = NULL;
2432 	struct imsg imsg;
2433 	size_t datalen;
2434 
2435 	*str = NULL;
2436 
2437 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2438 	if (err)
2439 		return err;
2440 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2441 
2442 	switch (imsg.hdr.type) {
2443 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2444 		if (datalen == 0)
2445 			break;
2446 		*str = strndup(imsg.data, datalen);
2447 		if (*str == NULL) {
2448 			err = got_error_from_errno("strndup");
2449 			break;
2450 		}
2451 		break;
2452 	default:
2453 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2454 		break;
2455 	}
2456 
2457 	imsg_free(&imsg);
2458 	return err;
2459 }
2460 
2461 const struct got_error *
2462 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2463     int *nremotes, struct imsgbuf *ibuf)
2464 {
2465 	const struct got_error *err = NULL;
2466 	struct imsg imsg;
2467 	size_t datalen;
2468 	struct got_imsg_remotes iremotes;
2469 	struct got_imsg_remote iremote;
2470 	const size_t min_datalen =
2471 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2472 
2473 	*remotes = NULL;
2474 	*nremotes = 0;
2475 	iremotes.nremotes = 0;
2476 
2477 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2478 	if (err)
2479 		return err;
2480 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2481 
2482 	switch (imsg.hdr.type) {
2483 	case GOT_IMSG_GOTCONFIG_REMOTES:
2484 		if (datalen != sizeof(iremotes)) {
2485 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2486 			break;
2487 		}
2488 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2489 		if (iremotes.nremotes < 0) {
2490 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2491 			break;
2492 		}
2493 		if (iremotes.nremotes == 0) {
2494 			imsg_free(&imsg);
2495 			return NULL;
2496 		}
2497 		break;
2498 	default:
2499 		imsg_free(&imsg);
2500 		return got_error(GOT_ERR_PRIVSEP_MSG);
2501 	}
2502 
2503 	imsg_free(&imsg);
2504 
2505 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2506 	if (*remotes == NULL)
2507 		return got_error_from_errno("recallocarray");
2508 
2509 	while (*nremotes < iremotes.nremotes) {
2510 		struct got_remote_repo *remote;
2511 		const size_t min_datalen =
2512 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2513 		int i;
2514 
2515 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2516 		if (err)
2517 			break;
2518 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2519 
2520 		switch (imsg.hdr.type) {
2521 		case GOT_IMSG_GOTCONFIG_REMOTE:
2522 			remote = &(*remotes)[*nremotes];
2523 			memset(remote, 0, sizeof(*remote));
2524 			if (datalen < sizeof(iremote)) {
2525 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2526 				break;
2527 			}
2528 			memcpy(&iremote, imsg.data, sizeof(iremote));
2529 			if (iremote.name_len == 0 ||
2530 			    (iremote.fetch_url_len == 0 &&
2531 			    iremote.send_url_len == 0) ||
2532 			    (sizeof(iremote) + iremote.name_len +
2533 			    iremote.fetch_url_len + iremote.send_url_len) >
2534 			    datalen) {
2535 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2536 				break;
2537 			}
2538 			remote->name = strndup(imsg.data + sizeof(iremote),
2539 			    iremote.name_len);
2540 			if (remote->name == NULL) {
2541 				err = got_error_from_errno("strndup");
2542 				break;
2543 			}
2544 			remote->fetch_url = strndup(imsg.data +
2545 			    sizeof(iremote) + iremote.name_len,
2546 			    iremote.fetch_url_len);
2547 			if (remote->fetch_url == NULL) {
2548 				err = got_error_from_errno("strndup");
2549 				free_remote_data(remote);
2550 				break;
2551 			}
2552 			remote->send_url = strndup(imsg.data +
2553 			    sizeof(iremote) + iremote.name_len +
2554 			    iremote.fetch_url_len, iremote.send_url_len);
2555 			if (remote->send_url == NULL) {
2556 				err = got_error_from_errno("strndup");
2557 				free_remote_data(remote);
2558 				break;
2559 			}
2560 			remote->mirror_references = iremote.mirror_references;
2561 			remote->fetch_all_branches = iremote.fetch_all_branches;
2562 			if (iremote.nfetch_branches > 0) {
2563 				remote->fetch_branches = recallocarray(NULL, 0,
2564 				    iremote.nfetch_branches, sizeof(char *));
2565 				if (remote->fetch_branches == NULL) {
2566 					err = got_error_from_errno("calloc");
2567 					free_remote_data(remote);
2568 					break;
2569 				}
2570 			}
2571 			remote->nfetch_branches = 0;
2572 			for (i = 0; i < iremote.nfetch_branches; i++) {
2573 				char *branch;
2574 				err = got_privsep_recv_gotconfig_str(&branch,
2575 				    ibuf);
2576 				if (err) {
2577 					free_remote_data(remote);
2578 					goto done;
2579 				}
2580 				remote->fetch_branches[i] = branch;
2581 				remote->nfetch_branches++;
2582 			}
2583 			if (iremote.nsend_branches > 0) {
2584 				remote->send_branches = recallocarray(NULL, 0,
2585 				    iremote.nsend_branches, sizeof(char *));
2586 				if (remote->send_branches == NULL) {
2587 					err = got_error_from_errno("calloc");
2588 					free_remote_data(remote);
2589 					break;
2590 				}
2591 			}
2592 			remote->nsend_branches = 0;
2593 			for (i = 0; i < iremote.nsend_branches; i++) {
2594 				char *branch;
2595 				err = got_privsep_recv_gotconfig_str(&branch,
2596 				    ibuf);
2597 				if (err) {
2598 					free_remote_data(remote);
2599 					goto done;
2600 				}
2601 				remote->send_branches[i] = branch;
2602 				remote->nsend_branches++;
2603 			}
2604 			if (iremote.nfetch_refs > 0) {
2605 				remote->fetch_refs = recallocarray(NULL, 0,
2606 				    iremote.nfetch_refs, sizeof(char *));
2607 				if (remote->fetch_refs == NULL) {
2608 					err = got_error_from_errno("calloc");
2609 					free_remote_data(remote);
2610 					break;
2611 				}
2612 			}
2613 			remote->nfetch_refs = 0;
2614 			for (i = 0; i < iremote.nfetch_refs; i++) {
2615 				char *ref;
2616 				err = got_privsep_recv_gotconfig_str(&ref,
2617 				    ibuf);
2618 				if (err) {
2619 					free_remote_data(remote);
2620 					goto done;
2621 				}
2622 				remote->fetch_refs[i] = ref;
2623 				remote->nfetch_refs++;
2624 			}
2625 			(*nremotes)++;
2626 			break;
2627 		default:
2628 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2629 			break;
2630 		}
2631 
2632 		imsg_free(&imsg);
2633 		if (err)
2634 			break;
2635 	}
2636 done:
2637 	if (err) {
2638 		int i;
2639 		for (i = 0; i < *nremotes; i++)
2640 			free_remote_data(&(*remotes)[i]);
2641 		free(*remotes);
2642 		*remotes = NULL;
2643 		*nremotes = 0;
2644 	}
2645 	return err;
2646 }
2647 
2648 const struct got_error *
2649 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2650     struct got_object_id *id, int idx, const char *path)
2651 {
2652 	struct ibuf *wbuf;
2653 	size_t path_len = strlen(path) + 1;
2654 
2655 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2656 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2657 	if (wbuf == NULL)
2658 		return got_error_from_errno(
2659 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2660 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2661 		return got_error_from_errno("imsg_add "
2662 		    "COMMIT_TRAVERSAL_REQUEST");
2663 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2664 		return got_error_from_errno("imsg_add "
2665 		    "COMMIT_TRAVERSAL_REQUEST");
2666 	if (imsg_add(wbuf, path, path_len) == -1)
2667 		return got_error_from_errno("imsg_add "
2668 		    "COMMIT_TRAVERSAL_REQUEST");
2669 
2670 	wbuf->fd = -1;
2671 	imsg_close(ibuf, wbuf);
2672 
2673 	return flush_imsg(ibuf);
2674 }
2675 
2676 const struct got_error *
2677 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2678     struct got_object_id **changed_commit_id,
2679     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2680 {
2681 	const struct got_error *err = NULL;
2682 	struct imsg imsg;
2683 	struct got_imsg_traversed_commits *icommits;
2684 	struct got_object_id *ids;
2685 	size_t datalen;
2686 	int i, done = 0;
2687 
2688 	*changed_commit = NULL;
2689 	*changed_commit_id = NULL;
2690 
2691 	while (!done) {
2692 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2693 		if (err)
2694 			return err;
2695 
2696 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2697 		switch (imsg.hdr.type) {
2698 		case GOT_IMSG_TRAVERSED_COMMITS:
2699 			icommits = imsg.data;
2700 			if (datalen != sizeof(*icommits) +
2701 			    icommits->ncommits * sizeof(*ids)) {
2702 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2703 				break;
2704 			}
2705 			ids = imsg.data + sizeof(*icommits);
2706 			for (i = 0; i < icommits->ncommits; i++) {
2707 				struct got_object_qid *qid;
2708 
2709 				err = got_object_qid_alloc_partial(&qid);
2710 				if (err)
2711 					break;
2712 				memcpy(&qid->id, &ids[i], sizeof(ids[i]));
2713 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2714 
2715 				/* The last commit may contain a change. */
2716 				if (i == icommits->ncommits - 1) {
2717 					*changed_commit_id =
2718 					    got_object_id_dup(&qid->id);
2719 					if (*changed_commit_id == NULL) {
2720 						err = got_error_from_errno(
2721 						    "got_object_id_dup");
2722 						break;
2723 					}
2724 				}
2725 			}
2726 			break;
2727 		case GOT_IMSG_COMMIT:
2728 			if (*changed_commit_id == NULL) {
2729 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2730 				break;
2731 			}
2732 			err = get_commit_from_imsg(changed_commit, &imsg,
2733 			    datalen, ibuf);
2734 			break;
2735 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2736 			done = 1;
2737 			break;
2738 		default:
2739 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2740 			break;
2741 		}
2742 
2743 		imsg_free(&imsg);
2744 		if (err)
2745 			break;
2746 	}
2747 
2748 	if (err)
2749 		got_object_id_queue_free(commit_ids);
2750 	return err;
2751 }
2752 
2753 const struct got_error *
2754 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2755     struct got_object_id *tree_id, const char *path,
2756     struct got_parsed_tree_entry *entries, int nentries)
2757 {
2758 	const struct got_error *err = NULL;
2759 	struct ibuf *wbuf;
2760 	size_t path_len = strlen(path);
2761 	size_t msglen;
2762 
2763 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2764 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2765 	if (wbuf == NULL)
2766 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2767 
2768 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2769 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2770 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2771 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2772 	if (imsg_add(wbuf, path, path_len) == -1)
2773 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2774 
2775 	wbuf->fd = -1;
2776 	imsg_close(ibuf, wbuf);
2777 
2778 	if (entries) {
2779 		err = send_tree_entries(ibuf, entries, nentries);
2780 		if (err)
2781 			return err;
2782 	}
2783 
2784 	return flush_imsg(ibuf);
2785 }
2786 
2787 const struct got_error *
2788 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2789 {
2790 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2791 	    0, 0, -1, NULL, 0) == -1)
2792 		return got_error_from_errno("imsg_compose "
2793 		    "OBJECT_ENUMERATION_REQUEST");
2794 
2795 	return flush_imsg(ibuf);
2796 }
2797 
2798 const struct got_error *
2799 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2800 {
2801 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2802 	    0, 0, -1, NULL, 0) == -1)
2803 		return got_error_from_errno("imsg_compose "
2804 		    "OBJECT_ENUMERATION_DONE");
2805 
2806 	return flush_imsg(ibuf);
2807 }
2808 
2809 const struct got_error *
2810 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2811 {
2812 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2813 	    0, 0, -1, NULL, 0) == -1)
2814 		return got_error_from_errno("imsg_compose "
2815 		    "OBJECT_ENUMERATION_INCOMPLETE");
2816 
2817 	return flush_imsg(ibuf);
2818 }
2819 
2820 const struct got_error *
2821 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2822     struct got_object_id *id, time_t mtime)
2823 {
2824 	struct ibuf *wbuf;
2825 
2826 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2827 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2828 	if (wbuf == NULL)
2829 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2830 
2831 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2832 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2833 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2834 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2835 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2836 
2837 	wbuf->fd = -1;
2838 	imsg_close(ibuf, wbuf);
2839 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2840 	return NULL;
2841 }
2842 
2843 const struct got_error *
2844 got_privsep_recv_enumerated_objects(int *found_all_objects,
2845     struct imsgbuf *ibuf,
2846     got_object_enumerate_commit_cb cb_commit,
2847     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2848     struct got_repository *repo)
2849 {
2850 	const struct got_error *err = NULL;
2851 	struct imsg imsg;
2852 	struct got_imsg_enumerated_commit *icommit = NULL;
2853 	struct got_object_id commit_id;
2854 	int have_commit = 0;
2855 	time_t mtime = 0;
2856 	struct got_tree_object tree;
2857 	struct got_imsg_enumerated_tree *itree;
2858 	struct got_object_id tree_id;
2859 	char *path = NULL, *canon_path = NULL;
2860 	size_t datalen, path_len;
2861 	int nentries = -1;
2862 	int done = 0;
2863 
2864 	*found_all_objects = 0;
2865 	memset(&tree, 0, sizeof(tree));
2866 
2867 	while (!done) {
2868 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2869 		if (err)
2870 			break;
2871 
2872 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2873 		switch (imsg.hdr.type) {
2874 		case GOT_IMSG_ENUMERATED_COMMIT:
2875 			if (have_commit && nentries != -1) {
2876 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2877 				break;
2878 			}
2879 			if (datalen != sizeof(*icommit)) {
2880 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2881 				break;
2882 			}
2883 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2884 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2885 			mtime = icommit->mtime;
2886 			have_commit = 1;
2887 			break;
2888 		case GOT_IMSG_ENUMERATED_TREE:
2889 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2890 			if (!have_commit) {
2891 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2892 				break;
2893 			}
2894 			if (datalen < sizeof(*itree)) {
2895 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2896 				break;
2897 			}
2898 			itree = imsg.data;
2899 			path_len = datalen - sizeof(*itree);
2900 			if (path_len == 0) {
2901 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2902 				break;
2903 			}
2904 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2905 			free(path);
2906 			path = strndup(imsg.data + sizeof(*itree), path_len);
2907 			if (path == NULL) {
2908 				err = got_error_from_errno("strndup");
2909 				break;
2910 			}
2911 			free(canon_path);
2912 			canon_path = malloc(path_len + 1);
2913 			if (canon_path == NULL) {
2914 				err = got_error_from_errno("malloc");
2915 				break;
2916 			}
2917 			if (!got_path_is_absolute(path)) {
2918 				err = got_error(GOT_ERR_BAD_PATH);
2919 				break;
2920 			}
2921 			if (got_path_is_root_dir(path)) {
2922 				/* XXX check what got_canonpath() does wrong */
2923 				canon_path[0] = '/';
2924 				canon_path[1] = '\0';
2925 			} else {
2926 				err = got_canonpath(path, canon_path,
2927 				    path_len + 1);
2928 				if (err)
2929 					break;
2930 			}
2931 			if (strcmp(path, canon_path) != 0) {
2932 				err = got_error(GOT_ERR_BAD_PATH);
2933 				break;
2934 			}
2935 			if (nentries != -1) {
2936 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2937 				break;
2938 			}
2939 			if (itree->nentries < -1) {
2940 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2941 				break;
2942 			}
2943 			if (itree->nentries == -1) {
2944 				/* Tree was not found in pack file. */
2945 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2946 				    path, repo);
2947 				break;
2948 			}
2949 			if (itree->nentries > INT_MAX) {
2950 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2951 				break;
2952 			}
2953 			tree.entries = calloc(itree->nentries,
2954 			    sizeof(struct got_tree_entry));
2955 			if (tree.entries == NULL) {
2956 				err = got_error_from_errno("calloc");
2957 				break;
2958 			}
2959 			if (itree->nentries == 0) {
2960 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2961 				    path, repo);
2962 				if (err)
2963 					break;
2964 
2965 				/* Prepare for next tree. */
2966 				free(tree.entries);
2967 				memset(&tree, 0, sizeof(tree));
2968 				nentries = -1;
2969 			} else {
2970 				tree.nentries = itree->nentries;
2971 				nentries = 0;
2972 			}
2973 			break;
2974 		case GOT_IMSG_TREE_ENTRIES:
2975 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2976 			if (nentries <= -1) {
2977 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2978 				break;
2979 			}
2980 			err = recv_tree_entries(imsg.data, datalen,
2981 			    &tree, &nentries);
2982 			if (err)
2983 				break;
2984 			if (tree.nentries == nentries) {
2985 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2986 				    path, repo);
2987 				if (err)
2988 					break;
2989 
2990 				/* Prepare for next tree. */
2991 				free(tree.entries);
2992 				memset(&tree, 0, sizeof(tree));
2993 				nentries = -1;
2994 			}
2995 			break;
2996 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2997 			/* All trees have been found and traversed. */
2998 			if (!have_commit || path == NULL || nentries != -1) {
2999 				err = got_error(GOT_ERR_PRIVSEP_MSG);
3000 				break;
3001 			}
3002 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
3003 			if (err)
3004 				break;
3005 			have_commit = 0;
3006 			break;
3007 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
3008 			*found_all_objects = 1;
3009 			done = 1;
3010 			break;
3011 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
3012 			done = 1;
3013 			break;
3014 		default:
3015 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3016 			break;
3017 		}
3018 
3019 		imsg_free(&imsg);
3020 		if (err)
3021 			break;
3022 	}
3023 
3024 	free(path);
3025 	free(canon_path);
3026 	free(tree.entries);
3027 	return err;
3028 }
3029 
3030 const struct got_error *
3031 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3032     struct got_object_id *id)
3033 {
3034 	struct got_imsg_raw_delta_request dreq;
3035 
3036 	memset(&dreq, 0, sizeof(dreq));
3037 	dreq.idx = idx;
3038 	memcpy(&dreq.id, id, sizeof(dreq.id));
3039 
3040 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3041 	    &dreq, sizeof(dreq)) == -1)
3042 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3043 
3044 	return flush_imsg(ibuf);
3045 }
3046 
3047 const struct got_error *
3048 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3049 {
3050 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3051 }
3052 
3053 const struct got_error *
3054 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3055     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3056     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3057 {
3058 	struct got_imsg_raw_delta idelta;
3059 	int ret;
3060 
3061 	memset(&idelta, 0, sizeof(idelta));
3062 	idelta.base_size = base_size;
3063 	idelta.result_size = result_size;
3064 	idelta.delta_size = delta_size;
3065 	idelta.delta_compressed_size = delta_compressed_size;
3066 	idelta.delta_offset = delta_offset;
3067 	idelta.delta_out_offset = delta_out_offset;
3068 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3069 
3070 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3071 	    &idelta, sizeof(idelta));
3072 	if (ret == -1)
3073 		return got_error_from_errno("imsg_compose RAW_DELTA");
3074 
3075 	return flush_imsg(ibuf);
3076 }
3077 
3078 const struct got_error *
3079 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3080     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3081     off_t *delta_out_offset, struct got_object_id **base_id,
3082     struct imsgbuf *ibuf)
3083 {
3084 	const struct got_error *err = NULL;
3085 	struct imsg imsg;
3086 	struct got_imsg_raw_delta *delta;
3087 	size_t datalen;
3088 
3089 	*base_size = 0;
3090 	*result_size = 0;
3091 	*delta_size = 0;
3092 	*delta_compressed_size = 0;
3093 	*delta_offset = 0;
3094 	*delta_out_offset = 0;
3095 	*base_id = NULL;
3096 
3097 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3098 	if (err)
3099 		return err;
3100 
3101 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3102 
3103 	switch (imsg.hdr.type) {
3104 	case GOT_IMSG_RAW_DELTA:
3105 		if (datalen != sizeof(*delta)) {
3106 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3107 			break;
3108 		}
3109 		delta = imsg.data;
3110 		*base_size = delta->base_size;
3111 		*result_size = delta->result_size;
3112 		*delta_size = delta->delta_size;
3113 		*delta_compressed_size = delta->delta_compressed_size;
3114 		*delta_offset = delta->delta_offset;
3115 		*delta_out_offset = delta->delta_out_offset;
3116 		*base_id = calloc(1, sizeof(**base_id));
3117 		if (*base_id == NULL) {
3118 			err = got_error_from_errno("malloc");
3119 			break;
3120 		}
3121 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3122 		break;
3123 	default:
3124 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3125 		break;
3126 	}
3127 
3128 	imsg_free(&imsg);
3129 
3130 	if (err) {
3131 		free(*base_id);
3132 		*base_id = NULL;
3133 	}
3134 	return err;
3135 }
3136 
3137 static const struct got_error *
3138 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3139 {
3140 	const struct got_error *err = NULL;
3141 	struct got_imsg_object_idlist idlist;
3142 	struct ibuf *wbuf;
3143 	size_t i;
3144 
3145 	memset(&idlist, 0, sizeof(idlist));
3146 
3147 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3148 		return got_error(GOT_ERR_NO_SPACE);
3149 
3150 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3151 	    sizeof(idlist) + nids * sizeof(**ids));
3152 	if (wbuf == NULL) {
3153 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3154 		return err;
3155 	}
3156 
3157 	idlist.nids = nids;
3158 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3159 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3160 
3161 	for (i = 0; i < nids; i++) {
3162 		struct got_object_id *id = ids[i];
3163 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3164 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3165 	}
3166 
3167 	wbuf->fd = -1;
3168 	imsg_close(ibuf, wbuf);
3169 
3170 	return flush_imsg(ibuf);
3171 }
3172 
3173 const struct got_error *
3174 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3175     struct got_object_id **ids, size_t nids)
3176 {
3177 	const struct got_error *err = NULL;
3178 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3179 	int i, queued = 0;
3180 
3181 	for (i = 0; i < nids; i++) {
3182 		idlist[i % nitems(idlist)] = ids[i];
3183 		queued++;
3184 		if (queued >= nitems(idlist)) {
3185 			err = send_idlist(ibuf, idlist, queued);
3186 			if (err)
3187 				return err;
3188 			queued = 0;
3189 		}
3190 	}
3191 
3192 	if (queued > 0) {
3193 		err = send_idlist(ibuf, idlist, queued);
3194 		if (err)
3195 			return err;
3196 	}
3197 
3198 	return NULL;
3199 }
3200 
3201 const struct got_error *
3202 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3203 {
3204 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3205 	    == -1)
3206 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3207 
3208 	return flush_imsg(ibuf);
3209 }
3210 
3211 const struct got_error *
3212 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3213     size_t *nids, struct imsgbuf *ibuf)
3214 {
3215 	const struct got_error *err = NULL;
3216 	struct imsg imsg;
3217 	struct got_imsg_object_idlist *idlist;
3218 	size_t datalen;
3219 
3220 	*ids = NULL;
3221 	*done = 0;
3222 	*nids = 0;
3223 
3224 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3225 	if (err)
3226 		return err;
3227 
3228 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3229 	switch (imsg.hdr.type) {
3230 	case GOT_IMSG_OBJ_ID_LIST:
3231 		if (datalen < sizeof(*idlist)) {
3232 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3233 			break;
3234 		}
3235 		idlist = imsg.data;
3236 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3237 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3238 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3239 			break;
3240 		}
3241 		*nids = idlist->nids;
3242 		*ids = calloc(*nids, sizeof(**ids));
3243 		if (*ids == NULL) {
3244 			err = got_error_from_errno("calloc");
3245 			break;
3246 		}
3247 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3248 		    *nids * sizeof(**ids));
3249 		break;
3250 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3251 		*done = 1;
3252 		break;
3253 	default:
3254 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3255 		break;
3256 	}
3257 
3258 	imsg_free(&imsg);
3259 
3260 	return err;
3261 }
3262 
3263 const struct got_error *
3264 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3265 {
3266 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3267 	    == -1)
3268 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3269 
3270 	return flush_imsg(ibuf);
3271 }
3272 
3273 const struct got_error *
3274 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3275     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3276 {
3277 	const struct got_error *err = NULL;
3278 	struct ibuf *wbuf;
3279 	struct got_imsg_reused_deltas ideltas;
3280 	size_t i;
3281 
3282 	memset(&ideltas, 0, sizeof(ideltas));
3283 
3284 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3285 		return got_error(GOT_ERR_NO_SPACE);
3286 
3287 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3288 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3289 	if (wbuf == NULL) {
3290 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3291 		return err;
3292 	}
3293 
3294 	ideltas.ndeltas = ndeltas;
3295 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3296 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3297 
3298 	for (i = 0; i < ndeltas; i++) {
3299 		struct got_imsg_reused_delta *delta = &deltas[i];
3300 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3301 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3302 	}
3303 
3304 	wbuf->fd = -1;
3305 	imsg_close(ibuf, wbuf);
3306 
3307 	return flush_imsg(ibuf);
3308 }
3309 
3310 const struct got_error *
3311 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3312 {
3313 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3314 	    == -1)
3315 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3316 
3317 	return flush_imsg(ibuf);
3318 }
3319 
3320 const struct got_error *
3321 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3322     size_t *ndeltas, struct imsgbuf *ibuf)
3323 {
3324 	const struct got_error *err = NULL;
3325 	struct imsg imsg;
3326 	struct got_imsg_reused_deltas *ideltas;
3327 	size_t datalen;
3328 
3329 	*done = 0;
3330 	*ndeltas = 0;
3331 
3332 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3333 	if (err)
3334 		return err;
3335 
3336 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3337 	switch (imsg.hdr.type) {
3338 	case GOT_IMSG_REUSED_DELTAS:
3339 		if (datalen < sizeof(*ideltas)) {
3340 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3341 			break;
3342 		}
3343 		ideltas = imsg.data;
3344 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3345 		    ideltas->ndeltas * sizeof(*deltas) >
3346 		    datalen - sizeof(*ideltas)) {
3347 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3348 			break;
3349 		}
3350 		*ndeltas = ideltas->ndeltas;
3351 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3352 		    *ndeltas * sizeof(*deltas));
3353 		break;
3354 	case GOT_IMSG_DELTA_REUSE_DONE:
3355 		*done = 1;
3356 		break;
3357 	default:
3358 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3359 		break;
3360 	}
3361 
3362 	imsg_free(&imsg);
3363 
3364 	return err;
3365 }
3366 
3367 const struct got_error *
3368 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3369 {
3370 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3371 	    0, 0, -1, NULL, 0)
3372 	    == -1)
3373 		return got_error_from_errno("imsg_compose "
3374 		    "COMMIT_PAINTING_INIT");
3375 
3376 	return flush_imsg(ibuf);
3377 }
3378 
3379 const struct got_error *
3380 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3381     struct got_object_id *id, intptr_t color)
3382 {
3383 	struct got_imsg_commit_painting_request ireq;
3384 
3385 	memset(&ireq, 0, sizeof(ireq));
3386 	memcpy(&ireq.id, id, sizeof(ireq.id));
3387 	ireq.idx = idx;
3388 	ireq.color = color;
3389 
3390 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3391 	    &ireq, sizeof(ireq)) == -1)
3392 		return got_error_from_errno("imsg_compose "
3393 		    "COMMIT_PAINTING_REQUEST");
3394 
3395 	return flush_imsg(ibuf);
3396 }
3397 
3398 static const struct got_error *
3399 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3400     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3401 {
3402 	const struct got_error *err = NULL;
3403 	struct ibuf *wbuf = NULL;
3404 	struct got_object_qid *qid;
3405 	size_t msglen;
3406 	int ncommits;
3407 	intptr_t color;
3408 
3409 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3410 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3411 	    sizeof(struct got_imsg_painted_commit);
3412 
3413 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3414 	if (wbuf == NULL) {
3415 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3416 		return err;
3417 	}
3418 
3419 	/* Keep in sync with struct got_imsg_painted_commits! */
3420 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3421 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3422 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3423 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3424 
3425 	while (ncommits > 0) {
3426 		qid = STAILQ_FIRST(ids);
3427 		STAILQ_REMOVE_HEAD(ids, entry);
3428 		ncommits--;
3429 		(*nids)--;
3430 		color = (intptr_t)qid->data;
3431 
3432 		/* Keep in sync with struct got_imsg_painted_commit! */
3433 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3434 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3435 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3436 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3437 
3438 		got_object_qid_free(qid);
3439 	}
3440 
3441 	wbuf->fd = -1;
3442 	imsg_close(ibuf, wbuf);
3443 
3444 	return flush_imsg(ibuf);
3445 }
3446 
3447 const struct got_error *
3448 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3449     struct got_object_id_queue *ids, int *nids,
3450     int present_in_pack, int flush)
3451 {
3452 	const struct got_error *err;
3453 	size_t remain;
3454 
3455 	if (*nids <= 0)
3456 		return NULL;
3457 
3458 	do {
3459 		remain = (sizeof(struct got_imsg_painted_commits)) +
3460 		    *nids * sizeof(struct got_imsg_painted_commit);
3461 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3462 			err = send_painted_commits(ids, nids, remain,
3463 			    present_in_pack, ibuf);
3464 			if (err)
3465 				return err;
3466 		}
3467 	} while (flush && *nids > 0);
3468 
3469 	return NULL;
3470 }
3471 
3472 const struct got_error *
3473 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3474 {
3475 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3476 	    0, 0, -1, NULL, 0)
3477 	    == -1)
3478 		return got_error_from_errno("imsg_compose "
3479 		    "COMMIT_PAINTING_DONE");
3480 
3481 	return flush_imsg(ibuf);
3482 }
3483 
3484 const struct got_error *
3485 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3486     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3487 {
3488 	const struct got_error *err = NULL;
3489 	struct imsg imsg;
3490 	struct got_imsg_painted_commits icommits;
3491 	struct got_imsg_painted_commit icommit;
3492 	size_t datalen;
3493 	int i;
3494 
3495 	for (;;) {
3496 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3497 		if (err)
3498 			return err;
3499 
3500 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3501 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3502 			break;
3503 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3504 			return got_error(GOT_ERR_PRIVSEP_MSG);
3505 
3506 		if (datalen < sizeof(icommits))
3507 			return got_error(GOT_ERR_PRIVSEP_LEN);
3508 		memcpy(&icommits, imsg.data, sizeof(icommits));
3509 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3510 		    datalen < sizeof(icommits) +
3511 		    icommits.ncommits * sizeof(icommit))
3512 			return got_error(GOT_ERR_PRIVSEP_LEN);
3513 
3514 		for (i = 0; i < icommits.ncommits; i++) {
3515 			memcpy(&icommit,
3516 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3517 			    sizeof(icommit));
3518 
3519 			if (icommits.present_in_pack) {
3520 				struct got_object_id id;
3521 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3522 				err = cb(cb_arg, &id, icommit.color);
3523 				if (err)
3524 					break;
3525 			} else {
3526 				struct got_object_qid *qid;
3527 				err = got_object_qid_alloc_partial(&qid);
3528 				if (err)
3529 					break;
3530 				memcpy(qid->id.sha1, icommit.id,
3531 				    SHA1_DIGEST_LENGTH);
3532 				qid->data = (void *)icommit.color;
3533 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3534 			}
3535 		}
3536 
3537 		imsg_free(&imsg);
3538 	}
3539 
3540 	return err;
3541 }
3542 
3543 const struct got_error *
3544 got_privsep_unveil_exec_helpers(void)
3545 {
3546 	const char *helpers[] = {
3547 	    GOT_PATH_PROG_READ_PACK,
3548 	    GOT_PATH_PROG_READ_OBJECT,
3549 	    GOT_PATH_PROG_READ_COMMIT,
3550 	    GOT_PATH_PROG_READ_TREE,
3551 	    GOT_PATH_PROG_READ_BLOB,
3552 	    GOT_PATH_PROG_READ_TAG,
3553 	    GOT_PATH_PROG_READ_GITCONFIG,
3554 	    GOT_PATH_PROG_READ_GOTCONFIG,
3555 	    GOT_PATH_PROG_READ_PATCH,
3556 	    GOT_PATH_PROG_FETCH_PACK,
3557 	    GOT_PATH_PROG_INDEX_PACK,
3558 	    GOT_PATH_PROG_SEND_PACK,
3559 	};
3560 	size_t i;
3561 
3562 	for (i = 0; i < nitems(helpers); i++) {
3563 		if (unveil(helpers[i], "x") == 0)
3564 			continue;
3565 		return got_error_from_errno2("unveil", helpers[i]);
3566 	}
3567 
3568 	return NULL;
3569 }
3570 
3571 void
3572 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3573 {
3574 	if (close(imsg_fds[0]) == -1) {
3575 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3576 		_exit(1);
3577 	}
3578 
3579 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3580 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3581 		_exit(1);
3582 	}
3583 
3584 	closefrom(GOT_IMSG_FD_CHILD + 1);
3585 
3586 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3587 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3588 		    strerror(errno));
3589 		_exit(1);
3590 	}
3591 }