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Date:: Sat Oct 28 11:32:53 2023 UTC
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1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <unistd.h>
34 #include <zlib.h>
35 
36 #include "got_compat.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_object_qid.h"
49 #include "got_lib_privsep.h"
50 #include "got_lib_pack.h"
51 #include "got_lib_poll.h"
52 
53 #include "got_privsep.h"
54 
55 #ifndef MIN
56 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
57 #endif
58 
59 #ifndef nitems
60 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
61 #endif
62 
63 static const struct got_error *
64 read_imsg(struct imsgbuf *ibuf)
65 {
66 	const struct got_error *err;
67 	size_t n;
68 
69 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
70 	if (err) {
71 		if (err->code == GOT_ERR_EOF)
72 			return got_error(GOT_ERR_PRIVSEP_PIPE);
73 		return err;
74 	}
75 
76 	n = imsg_read(ibuf);
77 	if (n == -1) {
78 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
79 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
80 		return got_error(GOT_ERR_PRIVSEP_READ);
81 	}
82 	if (n == 0)
83 		return got_error(GOT_ERR_PRIVSEP_PIPE);
84 
85 	return NULL;
86 }
87 
88 const struct got_error *
89 got_privsep_wait_for_child(pid_t pid)
90 {
91 	int child_status;
92 
93 	if (waitpid(pid, &child_status, 0) == -1)
94 		return got_error_from_errno("waitpid");
95 
96 	if (!WIFEXITED(child_status))
97 		return got_error(GOT_ERR_PRIVSEP_DIED);
98 
99 	if (WEXITSTATUS(child_status) != 0)
100 		return got_error(GOT_ERR_PRIVSEP_EXIT);
101 
102 	return NULL;
103 }
104 
105 static const struct got_error *
106 recv_imsg_error(struct imsg *imsg, size_t datalen)
107 {
108 	struct got_imsg_error *ierr;
109 
110 	if (datalen != sizeof(*ierr))
111 		return got_error(GOT_ERR_PRIVSEP_LEN);
112 
113 	ierr = imsg->data;
114 	if (ierr->code == GOT_ERR_ERRNO) {
115 		static struct got_error serr;
116 		serr.code = GOT_ERR_ERRNO;
117 		serr.msg = strerror(ierr->errno_code);
118 		return &serr;
119 	}
120 
121 	return got_error(ierr->code);
122 }
123 
124 const struct got_error *
125 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
126     size_t min_datalen)
127 {
128 	const struct got_error *err;
129 	ssize_t n;
130 
131 	n = imsg_get(ibuf, imsg);
132 	if (n == -1)
133 		return got_error_from_errno("imsg_get");
134 
135 	while (n == 0) {
136 		err = read_imsg(ibuf);
137 		if (err)
138 			return err;
139 		n = imsg_get(ibuf, imsg);
140 		if (n == -1)
141 			return got_error_from_errno("imsg_get");
142 	}
143 
144 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
145 		return got_error(GOT_ERR_PRIVSEP_LEN);
146 
147 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
148 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
149 		return recv_imsg_error(imsg, datalen);
150 	}
151 
152 	return NULL;
153 }
154 
155 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
156 void
157 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
158 {
159 	const struct got_error *poll_err;
160 	struct got_imsg_error ierr;
161 	int ret;
162 
163 	ierr.code = err->code;
164 	if (err->code == GOT_ERR_ERRNO)
165 		ierr.errno_code = errno;
166 	else
167 		ierr.errno_code = 0;
168 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
169 	if (ret == -1) {
170 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
171 		    getprogname(), err->code, err->msg, strerror(errno));
172 		return;
173 	}
174 
175 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
176 	if (poll_err) {
177 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
178 		    getprogname(), err->code, err->msg, poll_err->msg);
179 		return;
180 	}
181 
182 	ret = imsg_flush(ibuf);
183 	if (ret == -1) {
184 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
185 		    getprogname(), err->code, err->msg, strerror(errno));
186 		imsg_clear(ibuf);
187 		return;
188 	}
189 }
190 
191 static const struct got_error *
192 flush_imsg(struct imsgbuf *ibuf)
193 {
194 	const struct got_error *err;
195 
196 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
197 	if (err)
198 		return err;
199 
200 	if (imsg_flush(ibuf) == -1) {
201 		imsg_clear(ibuf);
202 		return got_error_from_errno("imsg_flush");
203 	}
204 
205 	return NULL;
206 }
207 
208 const struct got_error *
209 got_privsep_flush_imsg(struct imsgbuf *ibuf)
210 {
211 	return flush_imsg(ibuf);
212 }
213 
214 const struct got_error *
215 got_privsep_send_stop(int fd)
216 {
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 	return flush_imsg(&ibuf);
225 }
226 
227 const struct got_error *
228 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
229     struct got_object_id *id)
230 {
231 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
232 	    id, sizeof(*id)) == -1)
233 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
234 
235 	return flush_imsg(ibuf);
236 }
237 
238 const struct got_error *
239 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
240     struct got_object_id *id)
241 {
242 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
243 	    id, sizeof(*id)) == -1)
244 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
245 
246 	return flush_imsg(ibuf);
247 }
248 
249 const struct got_error *
250 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
251 {
252 	const struct got_error *err = NULL;
253 
254 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
255 	    == -1) {
256 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
257 		close(outfd);
258 		return err;
259 	}
260 
261 	return flush_imsg(ibuf);
262 }
263 
264 const struct got_error *
265 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
266     uint8_t *data)
267 {
268 	struct got_imsg_raw_obj iobj;
269 	size_t len = sizeof(iobj);
270 	struct ibuf *wbuf;
271 
272 	memset(&iobj, 0, sizeof(iobj));
273 	iobj.hdrlen = hdrlen;
274 	iobj.size = size;
275 
276 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
277 		len += (size_t)size + hdrlen;
278 
279 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
280 	if (wbuf == NULL)
281 		return got_error_from_errno("imsg_create RAW_OBJECT");
282 
283 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
284 		return got_error_from_errno("imsg_add RAW_OBJECT");
285 
286 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
287 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
288 			return got_error_from_errno("imsg_add RAW_OBJECT");
289 	}
290 
291 	wbuf->fd = -1;
292 	imsg_close(ibuf, wbuf);
293 
294 	return flush_imsg(ibuf);
295 }
296 
297 const struct got_error *
298 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
299     struct imsgbuf *ibuf)
300 {
301 	const struct got_error *err = NULL;
302 	struct imsg imsg;
303 	struct got_imsg_raw_obj *iobj;
304 	size_t datalen;
305 
306 	*outbuf = NULL;
307 
308 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
309 	if (err)
310 		return err;
311 
312 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
313 
314 	switch (imsg.hdr.type) {
315 	case GOT_IMSG_RAW_OBJECT:
316 		if (datalen < sizeof(*iobj)) {
317 			err = got_error(GOT_ERR_PRIVSEP_LEN);
318 			break;
319 		}
320 		iobj = imsg.data;
321 		*size = iobj->size;
322 		*hdrlen = iobj->hdrlen;
323 
324 		if (datalen == sizeof(*iobj)) {
325 			/* Data has been written to file descriptor. */
326 			break;
327 		}
328 
329 		if (*size < 0 ||
330 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
331 			err = got_error(GOT_ERR_PRIVSEP_LEN);
332 			break;
333 		}
334 
335 		*outbuf = malloc(*size + *hdrlen);
336 		if (*outbuf == NULL) {
337 			err = got_error_from_errno("malloc");
338 			break;
339 		}
340 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
341 		break;
342 	default:
343 		err = got_error(GOT_ERR_PRIVSEP_MSG);
344 		break;
345 	}
346 
347 	imsg_free(&imsg);
348 
349 	return err;
350 }
351 
352 const struct got_error *
353 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
354     struct got_object_id *id, int pack_idx)
355 {
356 	const struct got_error *err = NULL;
357 	struct got_imsg_packed_object iobj;
358 	void *data;
359 	size_t len;
360 
361 	memset(&iobj, 0, sizeof(iobj));
362 	if (pack_idx != -1) { /* commit is packed */
363 		iobj.idx = pack_idx;
364 		memcpy(&iobj.id, id, sizeof(iobj.id));
365 		data = &iobj;
366 		len = sizeof(iobj);
367 	} else {
368 		data = id;
369 		len = sizeof(*id);
370 	}
371 
372 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
373 	    == -1) {
374 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
375 		close(fd);
376 		return err;
377 	}
378 
379 	return flush_imsg(ibuf);
380 }
381 
382 const struct got_error *
383 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
384     struct got_object_id *id, int pack_idx)
385 {
386 	struct ibuf *wbuf;
387 	size_t len;
388 
389 	if (pack_idx != -1)
390 		len = sizeof(struct got_imsg_packed_object);
391 	else
392 		len = sizeof(*id);
393 
394 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
395 	if (wbuf == NULL)
396 		return got_error_from_errno("imsg_create TREE_REQUEST");
397 
398 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
399 		return got_error_from_errno("imsg_add TREE_REQUEST");
400 
401 	if (pack_idx != -1) { /* tree is packed */
402 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
403 			return got_error_from_errno("imsg_add TREE_REQUEST");
404 	}
405 
406 	wbuf->fd = fd;
407 	imsg_close(ibuf, wbuf);
408 
409 	return flush_imsg(ibuf);
410 }
411 
412 const struct got_error *
413 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
414     struct got_object_id *id, int pack_idx)
415 {
416 	struct got_imsg_packed_object iobj;
417 	void *data;
418 	size_t len;
419 
420 	memset(&iobj, 0, sizeof(iobj));
421 	if (pack_idx != -1) { /* tag is packed */
422 		iobj.idx = pack_idx;
423 		memcpy(&iobj.id, id, sizeof(iobj.id));
424 		data = &iobj;
425 		len = sizeof(iobj);
426 	} else {
427 		data = id;
428 		len = sizeof(*id);
429 	}
430 
431 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
432 	    == -1)
433 		return got_error_from_errno("imsg_compose TAG_REQUEST");
434 
435 	return flush_imsg(ibuf);
436 }
437 
438 const struct got_error *
439 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
440     struct got_object_id *id, int pack_idx)
441 {
442 	const struct got_error *err = NULL;
443 	struct got_imsg_packed_object iobj;
444 	void *data;
445 	size_t len;
446 
447 	memset(&iobj, 0, sizeof(iobj));
448 	if (pack_idx != -1) { /* blob is packed */
449 		iobj.idx = pack_idx;
450 		memcpy(&iobj.id, id, sizeof(iobj.id));
451 		data = &iobj;
452 		len = sizeof(iobj);
453 	} else {
454 		data = id;
455 		len = sizeof(*id);
456 	}
457 
458 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
459 	    == -1) {
460 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
461 		close(infd);
462 		return err;
463 	}
464 
465 	return flush_imsg(ibuf);
466 }
467 
468 const struct got_error *
469 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
470 {
471 	const struct got_error *err = NULL;
472 
473 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
474 	    == -1) {
475 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
476 		close(outfd);
477 		return err;
478 	}
479 
480 	return flush_imsg(ibuf);
481 }
482 
483 static const struct got_error *
484 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
485 {
486 	const struct got_error *err = NULL;
487 
488 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
489 		err = got_error_from_errno("imsg_compose TMPFD");
490 		close(fd);
491 		return err;
492 	}
493 
494 	return flush_imsg(ibuf);
495 }
496 
497 const struct got_error *
498 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
499 {
500 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
501 }
502 
503 const struct got_error *
504 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
505 {
506 	struct got_imsg_object iobj;
507 
508 	memset(&iobj, 0, sizeof(iobj));
509 
510 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
511 	iobj.type = obj->type;
512 	iobj.flags = obj->flags;
513 	iobj.hdrlen = obj->hdrlen;
514 	iobj.size = obj->size;
515 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
516 		iobj.pack_offset = obj->pack_offset;
517 		iobj.pack_idx = obj->pack_idx;
518 	}
519 
520 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
521 	    == -1)
522 		return got_error_from_errno("imsg_compose OBJECT");
523 
524 	return flush_imsg(ibuf);
525 }
526 
527 const struct got_error *
528 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
529     struct got_pathlist_head *have_refs, int fetch_all_branches,
530     struct got_pathlist_head *wanted_branches,
531     struct got_pathlist_head *wanted_refs, int list_refs_only,
532     const char *worktree_branch, const char *remote_head,
533     int no_head, int verbosity)
534 {
535 	const struct got_error *err = NULL;
536 	struct ibuf *wbuf;
537 	struct got_pathlist_entry *pe;
538 	struct got_imsg_fetch_request fetchreq;
539 	size_t remote_head_len, worktree_branch_len, len = sizeof(fetchreq);
540 
541 	if (worktree_branch) {
542 		worktree_branch_len = strlen(worktree_branch);
543 		len += worktree_branch_len;
544 	}
545 	if (remote_head) {
546 		remote_head_len = strlen(remote_head);
547 		len += remote_head_len;
548 	}
549 
550 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
551 		close(fd);
552 		return got_error(GOT_ERR_NO_SPACE);
553 	}
554 
555 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
556 	if (wbuf == NULL)
557 		return got_error_from_errno("imsg_create FETCH_HAVE_REF");
558 
559 	memset(&fetchreq, 0, sizeof(fetchreq));
560 	fetchreq.no_head = no_head;
561 	fetchreq.fetch_all_branches = fetch_all_branches;
562 	fetchreq.list_refs_only = list_refs_only;
563 	fetchreq.verbosity = verbosity;
564 	if (worktree_branch != NULL)
565 		fetchreq.worktree_branch_len = worktree_branch_len;
566 	if (remote_head != NULL)
567 		fetchreq.remote_head_len = remote_head_len;
568 	TAILQ_FOREACH(pe, have_refs, entry)
569 		fetchreq.n_have_refs++;
570 	TAILQ_FOREACH(pe, wanted_branches, entry)
571 		fetchreq.n_wanted_branches++;
572 	TAILQ_FOREACH(pe, wanted_refs, entry)
573 		fetchreq.n_wanted_refs++;
574 	if (imsg_add(wbuf, &fetchreq, sizeof(fetchreq)) == -1)
575 		return got_error_from_errno("imsg_add FETCH_REQUEST");
576 	if (worktree_branch) {
577 		if (imsg_add(wbuf, worktree_branch, worktree_branch_len) == -1)
578 			return got_error_from_errno("imsg_add FETCH_REQUEST");
579 	}
580 	if (remote_head) {
581 		if (imsg_add(wbuf, remote_head, remote_head_len) == -1)
582 			return got_error_from_errno("imsg_add FETCH_REQUEST");
583 	}
584 	wbuf->fd = fd;
585 	imsg_close(ibuf, wbuf);
586 
587 	err = flush_imsg(ibuf);
588 	if (err) {
589 		close(fd);
590 		return err;
591 	}
592 	fd = -1;
593 
594 	TAILQ_FOREACH(pe, have_refs, entry) {
595 		const char *name = pe->path;
596 		size_t name_len = pe->path_len;
597 		struct got_object_id *id = pe->data;
598 
599 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
600 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
601 		if (wbuf == NULL)
602 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
603 
604 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
605 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
606 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
607 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
608 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
609 		if (imsg_add(wbuf, name, name_len) == -1)
610 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
611 
612 		wbuf->fd = -1;
613 		imsg_close(ibuf, wbuf);
614 		err = flush_imsg(ibuf);
615 		if (err)
616 			return err;
617 	}
618 
619 	TAILQ_FOREACH(pe, wanted_branches, entry) {
620 		const char *name = pe->path;
621 		size_t name_len = pe->path_len;
622 
623 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
624 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
625 		    len);
626 		if (wbuf == NULL)
627 			return got_error_from_errno(
628 			    "imsg_create FETCH_WANTED_BRANCH");
629 
630 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
631 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
632 			return got_error_from_errno(
633 			    "imsg_add FETCH_WANTED_BRANCH");
634 		if (imsg_add(wbuf, name, name_len) == -1)
635 			return got_error_from_errno(
636 			    "imsg_add FETCH_WANTED_BRANCH");
637 
638 		wbuf->fd = -1;
639 		imsg_close(ibuf, wbuf);
640 		err = flush_imsg(ibuf);
641 		if (err)
642 			return err;
643 	}
644 
645 	TAILQ_FOREACH(pe, wanted_refs, entry) {
646 		const char *name = pe->path;
647 		size_t name_len = pe->path_len;
648 
649 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
650 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
651 		    len);
652 		if (wbuf == NULL)
653 			return got_error_from_errno(
654 			    "imsg_create FETCH_WANTED_REF");
655 
656 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
657 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
658 			return got_error_from_errno(
659 			    "imsg_add FETCH_WANTED_REF");
660 		if (imsg_add(wbuf, name, name_len) == -1)
661 			return got_error_from_errno(
662 			    "imsg_add FETCH_WANTED_REF");
663 
664 		wbuf->fd = -1;
665 		imsg_close(ibuf, wbuf);
666 		err = flush_imsg(ibuf);
667 		if (err)
668 			return err;
669 	}
670 
671 
672 	return NULL;
673 
674 }
675 
676 const struct got_error *
677 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
678 {
679 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
680 }
681 
682 const struct got_error *
683 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
684     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
685     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
686 {
687 	const struct got_error *err = NULL;
688 	struct imsg imsg;
689 	size_t datalen;
690 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
691 	size_t n, remain;
692 	off_t off;
693 	int i;
694 
695 	*done = 0;
696 	*id = NULL;
697 	*refname = NULL;
698 	*server_progress = NULL;
699 	*packfile_size = 0;
700 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
701 
702 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
703 	if (err)
704 		return err;
705 
706 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
707 	switch (imsg.hdr.type) {
708 	case GOT_IMSG_FETCH_SYMREFS:
709 		if (datalen < sizeof(*isymrefs)) {
710 			err = got_error(GOT_ERR_PRIVSEP_LEN);
711 			break;
712 		}
713 		if (isymrefs != NULL) {
714 			err = got_error(GOT_ERR_PRIVSEP_MSG);
715 			break;
716 		}
717 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
718 		off = sizeof(*isymrefs);
719 		remain = datalen - off;
720 		for (n = 0; n < isymrefs->nsymrefs; n++) {
721 			struct got_imsg_fetch_symref *s;
722 			char *name, *target;
723 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
724 				err = got_error(GOT_ERR_PRIVSEP_LEN);
725 				goto done;
726 			}
727 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
728 			off += sizeof(*s);
729 			remain -= sizeof(*s);
730 			if (remain < s->name_len) {
731 				err = got_error(GOT_ERR_PRIVSEP_LEN);
732 				goto done;
733 			}
734 			name = strndup(imsg.data + off, s->name_len);
735 			if (name == NULL) {
736 				err = got_error_from_errno("strndup");
737 				goto done;
738 			}
739 			off += s->name_len;
740 			remain -= s->name_len;
741 			if (remain < s->target_len) {
742 				err = got_error(GOT_ERR_PRIVSEP_LEN);
743 				free(name);
744 				goto done;
745 			}
746 			target = strndup(imsg.data + off, s->target_len);
747 			if (target == NULL) {
748 				err = got_error_from_errno("strndup");
749 				free(name);
750 				goto done;
751 			}
752 			off += s->target_len;
753 			remain -= s->target_len;
754 			err = got_pathlist_append(symrefs, name, target);
755 			if (err) {
756 				free(name);
757 				free(target);
758 				goto done;
759 			}
760 		}
761 		break;
762 	case GOT_IMSG_FETCH_REF:
763 		if (datalen <= sizeof(**id)) {
764 			err = got_error(GOT_ERR_PRIVSEP_MSG);
765 			break;
766 		}
767 		*id = malloc(sizeof(**id));
768 		if (*id == NULL) {
769 			err = got_error_from_errno("malloc");
770 			break;
771 		}
772 		memcpy(*id, imsg.data, sizeof(**id));
773 		*refname = strndup(imsg.data + sizeof(**id),
774 		    datalen - sizeof(**id));
775 		if (*refname == NULL) {
776 			err = got_error_from_errno("strndup");
777 			break;
778 		}
779 		break;
780 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
781 		if (datalen == 0) {
782 			err = got_error(GOT_ERR_PRIVSEP_LEN);
783 			break;
784 		}
785 		*server_progress = strndup(imsg.data, datalen);
786 		if (*server_progress == NULL) {
787 			err = got_error_from_errno("strndup");
788 			break;
789 		}
790 		for (i = 0; i < datalen; i++) {
791 			if (!isprint((unsigned char)(*server_progress)[i]) &&
792 			    !isspace((unsigned char)(*server_progress)[i])) {
793 				err = got_error(GOT_ERR_PRIVSEP_MSG);
794 				free(*server_progress);
795 				*server_progress = NULL;
796 				goto done;
797 			}
798 		}
799 		break;
800 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
801 		if (datalen < sizeof(*packfile_size)) {
802 			err = got_error(GOT_ERR_PRIVSEP_MSG);
803 			break;
804 		}
805 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
806 		break;
807 	case GOT_IMSG_FETCH_DONE:
808 		if (datalen != SHA1_DIGEST_LENGTH) {
809 			err = got_error(GOT_ERR_PRIVSEP_MSG);
810 			break;
811 		}
812 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
813 		*done = 1;
814 		break;
815 	default:
816 		err = got_error(GOT_ERR_PRIVSEP_MSG);
817 		break;
818 	}
819 done:
820 	if (err) {
821 		free(*id);
822 		*id = NULL;
823 		free(*refname);
824 		*refname = NULL;
825 	}
826 	imsg_free(&imsg);
827 	return err;
828 }
829 
830 static const struct got_error *
831 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
832     int delete, struct imsgbuf *ibuf)
833 {
834 	size_t len;
835 	struct ibuf *wbuf;
836 
837 	len = sizeof(struct got_imsg_send_ref) + name_len;
838 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
839 	if (wbuf == NULL)
840 		return got_error_from_errno("imsg_create SEND_REF");
841 
842 	/* Keep in sync with struct got_imsg_send_ref! */
843 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
844 		return got_error_from_errno("imsg_add SEND_REF");
845 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
846 		return got_error_from_errno("imsg_add SEND_REF");
847 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
848 		return got_error_from_errno("imsg_add SEND_REF");
849 	if (imsg_add(wbuf, name, name_len) == -1)
850 		return got_error_from_errno("imsg_add SEND_REF");
851 
852 	wbuf->fd = -1;
853 	imsg_close(ibuf, wbuf);
854 	return flush_imsg(ibuf);
855 }
856 
857 const struct got_error *
858 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
859     struct got_pathlist_head *have_refs,
860     struct got_pathlist_head *delete_refs,
861     int verbosity)
862 {
863 	const struct got_error *err = NULL;
864 	struct got_pathlist_entry *pe;
865 	struct got_imsg_send_request sendreq;
866 	struct got_object_id zero_id;
867 
868 	memset(&zero_id, 0, sizeof(zero_id));
869 	memset(&sendreq, 0, sizeof(sendreq));
870 	sendreq.verbosity = verbosity;
871 	TAILQ_FOREACH(pe, have_refs, entry)
872 		sendreq.nrefs++;
873 	TAILQ_FOREACH(pe, delete_refs, entry)
874 		sendreq.nrefs++;
875 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
876 	    &sendreq, sizeof(sendreq)) == -1) {
877 		err = got_error_from_errno(
878 		    "imsg_compose FETCH_SERVER_PROGRESS");
879 		goto done;
880 	}
881 
882 	err = flush_imsg(ibuf);
883 	if (err)
884 		goto done;
885 	fd = -1;
886 
887 	TAILQ_FOREACH(pe, have_refs, entry) {
888 		const char *name = pe->path;
889 		size_t name_len = pe->path_len;
890 		struct got_object_id *id = pe->data;
891 		err = send_send_ref(name, name_len, id, 0, ibuf);
892 		if (err)
893 			goto done;
894 	}
895 
896 	TAILQ_FOREACH(pe, delete_refs, entry) {
897 		const char *name = pe->path;
898 		size_t name_len = pe->path_len;
899 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
900 		if (err)
901 			goto done;
902 	}
903 done:
904 	if (fd != -1 && close(fd) == -1 && err == NULL)
905 		err = got_error_from_errno("close");
906 	return err;
907 
908 }
909 
910 const struct got_error *
911 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
912     struct imsgbuf *ibuf)
913 {
914 	const struct got_error *err = NULL;
915 	struct imsg imsg;
916 	size_t datalen;
917 	int done = 0;
918 	struct got_imsg_send_remote_ref iremote_ref;
919 	struct got_object_id *id = NULL;
920 	char *refname = NULL;
921 	struct got_pathlist_entry *new;
922 
923 	while (!done) {
924 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
925 		if (err)
926 			return err;
927 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
928 		switch (imsg.hdr.type) {
929 		case GOT_IMSG_SEND_REMOTE_REF:
930 			if (datalen < sizeof(iremote_ref)) {
931 				err = got_error(GOT_ERR_PRIVSEP_MSG);
932 				goto done;
933 			}
934 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
935 			if (datalen != sizeof(iremote_ref) +
936 			    iremote_ref.name_len) {
937 				err = got_error(GOT_ERR_PRIVSEP_MSG);
938 				goto done;
939 			}
940 			id = malloc(sizeof(*id));
941 			if (id == NULL) {
942 				err = got_error_from_errno("malloc");
943 				goto done;
944 			}
945 			memcpy(id, &iremote_ref.id, sizeof(*id));
946 			refname = strndup(imsg.data + sizeof(iremote_ref),
947 			    datalen - sizeof(iremote_ref));
948 			if (refname == NULL) {
949 				err = got_error_from_errno("strndup");
950 				goto done;
951 			}
952 			err = got_pathlist_insert(&new, remote_refs,
953 			    refname, id);
954 			if (err)
955 				goto done;
956 			if (new == NULL) { /* duplicate which wasn't inserted */
957 				free(id);
958 				free(refname);
959 			}
960 			id = NULL;
961 			refname = NULL;
962 			break;
963 		case GOT_IMSG_SEND_PACK_REQUEST:
964 			if (datalen != 0) {
965 				err = got_error(GOT_ERR_PRIVSEP_MSG);
966 				goto done;
967 			}
968 			/* got-send-pack is now waiting for a pack file. */
969 			done = 1;
970 			break;
971 		default:
972 			err = got_error(GOT_ERR_PRIVSEP_MSG);
973 			break;
974 		}
975 	}
976 done:
977 	free(id);
978 	free(refname);
979 	imsg_free(&imsg);
980 	return err;
981 }
982 
983 const struct got_error *
984 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
985 {
986 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
987 }
988 
989 const struct got_error *
990 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
991     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
992 {
993 	const struct got_error *err = NULL;
994 	struct imsg imsg;
995 	size_t datalen;
996 	struct got_imsg_send_ref_status iref_status;
997 
998 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
999 	*done = 0;
1000 	*success = 0;
1001 	*refname = NULL;
1002 	*errmsg = NULL;
1003 
1004 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1005 	if (err)
1006 		return err;
1007 
1008 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1009 	switch (imsg.hdr.type) {
1010 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1011 		if (datalen < sizeof(*bytes_sent)) {
1012 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1013 			break;
1014 		}
1015 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1016 		break;
1017 	case GOT_IMSG_SEND_REF_STATUS:
1018 		if (datalen < sizeof(iref_status)) {
1019 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1020 			break;
1021 		}
1022 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1023 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1024 		    iref_status.errmsg_len) {
1025 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1026 			break;
1027 		}
1028 		*success = iref_status.success;
1029 		*refname = strndup(imsg.data + sizeof(iref_status),
1030 		    iref_status.name_len);
1031 
1032 		if (iref_status.errmsg_len != 0)
1033 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1034 			    iref_status.name_len, iref_status.errmsg_len);
1035 		break;
1036 	case GOT_IMSG_SEND_DONE:
1037 		if (datalen != 0) {
1038 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1039 			break;
1040 		}
1041 		*done = 1;
1042 		break;
1043 	default:
1044 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1045 		break;
1046 	}
1047 
1048 	imsg_free(&imsg);
1049 	return err;
1050 }
1051 
1052 const struct got_error *
1053 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1054     int fd)
1055 {
1056 	const struct got_error *err = NULL;
1057 
1058 	/* Keep in sync with struct got_imsg_index_pack_request */
1059 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1060 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1061 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1062 		close(fd);
1063 		return err;
1064 	}
1065 	return flush_imsg(ibuf);
1066 }
1067 
1068 const struct got_error *
1069 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1070 {
1071 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1072 }
1073 
1074 const struct got_error *
1075 got_privsep_recv_index_progress(int *done, int *nobj_total,
1076     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1077     struct imsgbuf *ibuf)
1078 {
1079 	const struct got_error *err = NULL;
1080 	struct imsg imsg;
1081 	struct got_imsg_index_pack_progress *iprogress;
1082 	size_t datalen;
1083 
1084 	*done = 0;
1085 	*nobj_total = 0;
1086 	*nobj_indexed = 0;
1087 	*nobj_resolved = 0;
1088 
1089 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1090 	if (err)
1091 		return err;
1092 
1093 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1094 	switch (imsg.hdr.type) {
1095 	case GOT_IMSG_IDXPACK_PROGRESS:
1096 		if (datalen < sizeof(*iprogress)) {
1097 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1098 			break;
1099 		}
1100 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1101 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1102 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1103 			err = got_error(GOT_ERR_RANGE);
1104 			break;
1105 		}
1106 		*nobj_total = iprogress->nobj_total;
1107 		*nobj_indexed = iprogress->nobj_indexed;
1108 		*nobj_loose = iprogress->nobj_loose;
1109 		*nobj_resolved = iprogress->nobj_resolved;
1110 		break;
1111 	case GOT_IMSG_IDXPACK_DONE:
1112 		if (datalen != 0) {
1113 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1114 			break;
1115 		}
1116 		*done = 1;
1117 		break;
1118 	default:
1119 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1120 		break;
1121 	}
1122 
1123 	imsg_free(&imsg);
1124 	return err;
1125 }
1126 
1127 const struct got_error *
1128 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1129     struct imsgbuf *ibuf)
1130 {
1131 	struct got_imsg_object *iobj;
1132 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1133 
1134 	if (datalen != sizeof(*iobj))
1135 		return got_error(GOT_ERR_PRIVSEP_LEN);
1136 	iobj = imsg->data;
1137 
1138 	if (iobj->pack_offset < 0)
1139 		return got_error(GOT_ERR_PACK_OFFSET);
1140 
1141 	*obj = calloc(1, sizeof(**obj));
1142 	if (*obj == NULL)
1143 		return got_error_from_errno("calloc");
1144 
1145 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1146 	(*obj)->type = iobj->type;
1147 	(*obj)->flags = iobj->flags;
1148 	(*obj)->hdrlen = iobj->hdrlen;
1149 	(*obj)->size = iobj->size;
1150 	/* path_packfile is handled by caller */
1151 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1152 		(*obj)->pack_offset = iobj->pack_offset;
1153 		(*obj)->pack_idx = iobj->pack_idx;
1154 	}
1155 	STAILQ_INIT(&(*obj)->deltas.entries);
1156 	return NULL;
1157 }
1158 
1159 const struct got_error *
1160 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1161 {
1162 	const struct got_error *err = NULL;
1163 	struct imsg imsg;
1164 	const size_t min_datalen =
1165 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1166 
1167 	*obj = NULL;
1168 
1169 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1170 	if (err)
1171 		return err;
1172 
1173 	switch (imsg.hdr.type) {
1174 	case GOT_IMSG_OBJECT:
1175 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1176 		break;
1177 	default:
1178 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1179 		break;
1180 	}
1181 
1182 	imsg_free(&imsg);
1183 
1184 	return err;
1185 }
1186 
1187 static const struct got_error *
1188 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1189     size_t logmsg_len)
1190 {
1191 	const struct got_error *err = NULL;
1192 	size_t offset, remain;
1193 
1194 	offset = 0;
1195 	remain = logmsg_len;
1196 	while (remain > 0) {
1197 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1198 
1199 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1200 		    commit->logmsg + offset, n) == -1) {
1201 			err = got_error_from_errno("imsg_compose "
1202 			    "COMMIT_LOGMSG");
1203 			break;
1204 		}
1205 
1206 		err = flush_imsg(ibuf);
1207 		if (err)
1208 			break;
1209 
1210 		offset += n;
1211 		remain -= n;
1212 	}
1213 
1214 	return err;
1215 }
1216 
1217 const struct got_error *
1218 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1219 {
1220 	const struct got_error *err = NULL;
1221 	struct got_imsg_commit_object *icommit;
1222 	uint8_t *buf;
1223 	size_t len, total;
1224 	struct got_object_qid *qid;
1225 	size_t author_len = strlen(commit->author);
1226 	size_t committer_len = strlen(commit->committer);
1227 	size_t logmsg_len = strlen(commit->logmsg);
1228 
1229 	total = sizeof(*icommit) + author_len + committer_len +
1230 	    commit->nparents * sizeof(struct got_object_id);
1231 
1232 	buf = malloc(total);
1233 	if (buf == NULL)
1234 		return got_error_from_errno("malloc");
1235 
1236 	icommit = (struct got_imsg_commit_object *)buf;
1237 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1238 	icommit->author_len = author_len;
1239 	icommit->author_time = commit->author_time;
1240 	icommit->author_gmtoff = commit->author_gmtoff;
1241 	icommit->committer_len = committer_len;
1242 	icommit->committer_time = commit->committer_time;
1243 	icommit->committer_gmtoff = commit->committer_gmtoff;
1244 	icommit->logmsg_len = logmsg_len;
1245 	icommit->nparents = commit->nparents;
1246 
1247 	len = sizeof(*icommit);
1248 	memcpy(buf + len, commit->author, author_len);
1249 	len += author_len;
1250 	memcpy(buf + len, commit->committer, committer_len);
1251 	len += committer_len;
1252 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1253 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1254 		len += sizeof(qid->id);
1255 	}
1256 
1257 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1258 		err = got_error_from_errno("imsg_compose COMMIT");
1259 		goto done;
1260 	}
1261 
1262 	if (logmsg_len == 0 ||
1263 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1264 		err = flush_imsg(ibuf);
1265 		if (err)
1266 			goto done;
1267 	}
1268 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1269 done:
1270 	free(buf);
1271 	return err;
1272 }
1273 
1274 static const struct got_error *
1275 get_commit_from_imsg(struct got_commit_object **commit,
1276     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1277 {
1278 	const struct got_error *err = NULL;
1279 	struct got_imsg_commit_object *icommit;
1280 	size_t len = 0;
1281 	int i;
1282 
1283 	if (datalen < sizeof(*icommit))
1284 		return got_error(GOT_ERR_PRIVSEP_LEN);
1285 
1286 	icommit = imsg->data;
1287 	if (datalen != sizeof(*icommit) + icommit->author_len +
1288 	    icommit->committer_len +
1289 	    icommit->nparents * sizeof(struct got_object_id))
1290 		return got_error(GOT_ERR_PRIVSEP_LEN);
1291 
1292 	if (icommit->nparents < 0)
1293 		return got_error(GOT_ERR_PRIVSEP_LEN);
1294 
1295 	len += sizeof(*icommit);
1296 
1297 	*commit = got_object_commit_alloc_partial();
1298 	if (*commit == NULL)
1299 		return got_error_from_errno(
1300 		    "got_object_commit_alloc_partial");
1301 
1302 	memcpy((*commit)->tree_id, &icommit->tree_id,
1303 	    sizeof(icommit->tree_id));
1304 	(*commit)->author_time = icommit->author_time;
1305 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1306 	(*commit)->committer_time = icommit->committer_time;
1307 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1308 
1309 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1310 	if ((*commit)->author == NULL) {
1311 		err = got_error_from_errno("strndup");
1312 		goto done;
1313 	}
1314 	len += icommit->author_len;
1315 
1316 	(*commit)->committer = strndup(imsg->data + len,
1317 	    icommit->committer_len);
1318 	if ((*commit)->committer == NULL) {
1319 		err = got_error_from_errno("strndup");
1320 		goto done;
1321 	}
1322 	len += icommit->committer_len;
1323 
1324 	if (icommit->logmsg_len == 0) {
1325 		(*commit)->logmsg = strdup("");
1326 		if ((*commit)->logmsg == NULL) {
1327 			err = got_error_from_errno("strdup");
1328 			goto done;
1329 		}
1330 	} else {
1331 		size_t offset = 0, remain = icommit->logmsg_len;
1332 
1333 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1334 		if ((*commit)->logmsg == NULL) {
1335 			err = got_error_from_errno("malloc");
1336 			goto done;
1337 		}
1338 		while (remain > 0) {
1339 			struct imsg imsg_log;
1340 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1341 			    remain);
1342 
1343 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1344 			if (err)
1345 				goto done;
1346 
1347 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1348 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1349 				goto done;
1350 			}
1351 
1352 			memcpy((*commit)->logmsg + offset,
1353 			    imsg_log.data, n);
1354 			imsg_free(&imsg_log);
1355 			offset += n;
1356 			remain -= n;
1357 		}
1358 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1359 	}
1360 
1361 	for (i = 0; i < icommit->nparents; i++) {
1362 		struct got_object_qid *qid;
1363 
1364 		err = got_object_qid_alloc_partial(&qid);
1365 		if (err)
1366 			break;
1367 		memcpy(&qid->id, imsg->data + len +
1368 		    i * sizeof(qid->id), sizeof(qid->id));
1369 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1370 		(*commit)->nparents++;
1371 	}
1372 done:
1373 	if (err) {
1374 		got_object_commit_close(*commit);
1375 		*commit = NULL;
1376 	}
1377 	return err;
1378 }
1379 
1380 const struct got_error *
1381 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1382 {
1383 	const struct got_error *err = NULL;
1384 	struct imsg imsg;
1385 	size_t datalen;
1386 	const size_t min_datalen =
1387 	    MIN(sizeof(struct got_imsg_error),
1388 	    sizeof(struct got_imsg_commit_object));
1389 
1390 	*commit = NULL;
1391 
1392 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1393 	if (err)
1394 		return err;
1395 
1396 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1397 
1398 	switch (imsg.hdr.type) {
1399 	case GOT_IMSG_COMMIT:
1400 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1401 		break;
1402 	default:
1403 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1404 		break;
1405 	}
1406 
1407 	imsg_free(&imsg);
1408 
1409 	return err;
1410 }
1411 
1412 static const struct got_error *
1413 send_tree_entries_batch(struct imsgbuf *ibuf,
1414     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1415 {
1416 	struct ibuf *wbuf;
1417 	struct got_imsg_tree_entries ientries;
1418 	int i;
1419 
1420 	memset(&ientries, 0, sizeof(ientries));
1421 
1422 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1423 	if (wbuf == NULL)
1424 		return got_error_from_errno("imsg_create TREE_ENTRY");
1425 
1426 	ientries.nentries = idxN - idx0 + 1;
1427 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1428 		return got_error_from_errno("imsg_add TREE_ENTRY");
1429 
1430 	for (i = idx0; i <= idxN; i++) {
1431 		struct got_parsed_tree_entry *pte = &entries[i];
1432 
1433 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1434 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1435 			return got_error_from_errno("imsg_add TREE_ENTRY");
1436 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1437 			return got_error_from_errno("imsg_add TREE_ENTRY");
1438 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1439 			return got_error_from_errno("imsg_add TREE_ENTRY");
1440 
1441 		/* Remaining bytes are the entry's name. */
1442 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1443 			return got_error_from_errno("imsg_add TREE_ENTRY");
1444 	}
1445 
1446 	wbuf->fd = -1;
1447 	imsg_close(ibuf, wbuf);
1448 	return NULL;
1449 }
1450 
1451 static const struct got_error *
1452 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1453     int nentries)
1454 {
1455 	const struct got_error *err = NULL;
1456 	int i, j;
1457 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1458 
1459 	i = 0;
1460 	for (j = 0; j < nentries; j++) {
1461 		struct got_parsed_tree_entry *pte = &entries[j];
1462 		size_t len = sizeof(struct got_imsg_tree_entry) + pte->namelen;
1463 
1464 		if (j > 0 &&
1465 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1466 			err = send_tree_entries_batch(ibuf, entries,
1467 			    i, j - 1, entries_len);
1468 			if (err)
1469 				return err;
1470 			i = j;
1471 			entries_len = sizeof(struct got_imsg_tree_entries);
1472 		}
1473 
1474 		entries_len += len;
1475 	}
1476 
1477 	if (j > 0) {
1478 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1479 		    entries_len);
1480 		if (err)
1481 			return err;
1482 	}
1483 
1484 	return NULL;
1485 }
1486 
1487 const struct got_error *
1488 got_privsep_send_tree(struct imsgbuf *ibuf,
1489     struct got_parsed_tree_entry *entries, int nentries)
1490 {
1491 	const struct got_error *err = NULL;
1492 	struct got_imsg_tree_object itree;
1493 
1494 	memset(&itree, 0, sizeof(itree));
1495 	itree.nentries = nentries;
1496 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1497 	    == -1)
1498 		return got_error_from_errno("imsg_compose TREE");
1499 
1500 	err = send_tree_entries(ibuf, entries, nentries);
1501 	if (err)
1502 		return err;
1503 
1504 	return flush_imsg(ibuf);
1505 }
1506 
1507 
1508 static const struct got_error *
1509 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1510     int *nentries)
1511 {
1512 	const struct got_error *err = NULL;
1513 	struct got_imsg_tree_entries *ientries;
1514 	struct got_tree_entry *te;
1515 	size_t te_offset;
1516 	size_t i;
1517 
1518 	if (datalen <= sizeof(*ientries) ||
1519 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1520 		return got_error(GOT_ERR_PRIVSEP_LEN);
1521 
1522 	ientries = (struct got_imsg_tree_entries *)data;
1523 	if (ientries->nentries > INT_MAX) {
1524 		return got_error_msg(GOT_ERR_NO_SPACE,
1525 		    "too many tree entries");
1526 	}
1527 
1528 	te_offset = sizeof(*ientries);
1529 	for (i = 0; i < ientries->nentries; i++) {
1530 		struct got_imsg_tree_entry ite;
1531 		const char *te_name;
1532 		uint8_t *buf = (uint8_t *)data + te_offset;
1533 
1534 		if (te_offset >= datalen) {
1535 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1536 			break;
1537 		}
1538 
1539 		/* Might not be aligned, size is ~32 bytes. */
1540 		memcpy(&ite, buf, sizeof(ite));
1541 
1542 		if (ite.namelen >= sizeof(te->name)) {
1543 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1544 			break;
1545 		}
1546 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1547 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1548 			break;
1549 		}
1550 
1551 		if (*nentries >= tree->nentries) {
1552 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1553 			break;
1554 		}
1555 		te = &tree->entries[*nentries];
1556 		te_name = buf + sizeof(ite);
1557 		memcpy(te->name, te_name, ite.namelen);
1558 		te->name[ite.namelen] = '\0';
1559 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1560 		te->mode = ite.mode;
1561 		te->idx = *nentries;
1562 		(*nentries)++;
1563 
1564 		te_offset += sizeof(ite) + ite.namelen;
1565 	}
1566 
1567 	return err;
1568 }
1569 
1570 const struct got_error *
1571 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1572 {
1573 	const struct got_error *err = NULL;
1574 	const size_t min_datalen =
1575 	    MIN(sizeof(struct got_imsg_error),
1576 	    sizeof(struct got_imsg_tree_object));
1577 	struct got_imsg_tree_object *itree;
1578 	int nentries = 0;
1579 
1580 	*tree = NULL;
1581 
1582 	while (*tree == NULL || nentries < (*tree)->nentries) {
1583 		struct imsg imsg;
1584 		size_t datalen;
1585 
1586 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1587 		if (err)
1588 			break;
1589 
1590 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1591 
1592 		switch (imsg.hdr.type) {
1593 		case GOT_IMSG_TREE:
1594 			/* This message should only appear once. */
1595 			if (*tree != NULL) {
1596 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1597 				break;
1598 			}
1599 			if (datalen != sizeof(*itree)) {
1600 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1601 				break;
1602 			}
1603 			itree = imsg.data;
1604 			if (itree->nentries < 0) {
1605 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1606 				break;
1607 			}
1608 			*tree = malloc(sizeof(**tree));
1609 			if (*tree == NULL) {
1610 				err = got_error_from_errno("malloc");
1611 				break;
1612 			}
1613 			(*tree)->entries = calloc(itree->nentries,
1614 			    sizeof(struct got_tree_entry));
1615 			if ((*tree)->entries == NULL) {
1616 				err = got_error_from_errno("malloc");
1617 				free(*tree);
1618 				*tree = NULL;
1619 				break;
1620 			}
1621 			(*tree)->nentries = itree->nentries;
1622 			(*tree)->refcnt = 0;
1623 			break;
1624 		case GOT_IMSG_TREE_ENTRIES:
1625 			/* This message should be preceeded by GOT_IMSG_TREE. */
1626 			if (*tree == NULL) {
1627 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1628 				break;
1629 			}
1630 			err = recv_tree_entries(imsg.data, datalen,
1631 			    *tree, &nentries);
1632 			break;
1633 		default:
1634 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1635 			break;
1636 		}
1637 
1638 		imsg_free(&imsg);
1639 		if (err)
1640 			break;
1641 	}
1642 
1643 	if (*tree && (*tree)->nentries != nentries) {
1644 		if (err == NULL)
1645 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1646 		got_object_tree_close(*tree);
1647 		*tree = NULL;
1648 	}
1649 
1650 	return err;
1651 }
1652 
1653 const struct got_error *
1654 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1655     const uint8_t *data)
1656 {
1657 	struct got_imsg_blob iblob;
1658 
1659 	memset(&iblob, 0, sizeof(iblob));
1660 	iblob.size = size;
1661 	iblob.hdrlen = hdrlen;
1662 
1663 	if (data) {
1664 		uint8_t *buf;
1665 
1666 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1667 			return got_error(GOT_ERR_NO_SPACE);
1668 
1669 		buf = malloc(sizeof(iblob) + size);
1670 		if (buf == NULL)
1671 			return got_error_from_errno("malloc");
1672 
1673 		memcpy(buf, &iblob, sizeof(iblob));
1674 		memcpy(buf + sizeof(iblob), data, size);
1675 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1676 		    sizeof(iblob) + size) == -1) {
1677 			free(buf);
1678 			return got_error_from_errno("imsg_compose BLOB");
1679 		}
1680 		free(buf);
1681 	} else {
1682 		/* Data has already been written to file descriptor. */
1683 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1684 		    sizeof(iblob)) == -1)
1685 			return got_error_from_errno("imsg_compose BLOB");
1686 	}
1687 
1688 
1689 	return flush_imsg(ibuf);
1690 }
1691 
1692 const struct got_error *
1693 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1694     struct imsgbuf *ibuf)
1695 {
1696 	const struct got_error *err = NULL;
1697 	struct imsg imsg;
1698 	struct got_imsg_blob *iblob;
1699 	size_t datalen;
1700 
1701 	*outbuf = NULL;
1702 
1703 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1704 	if (err)
1705 		return err;
1706 
1707 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1708 
1709 	switch (imsg.hdr.type) {
1710 	case GOT_IMSG_BLOB:
1711 		if (datalen < sizeof(*iblob)) {
1712 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1713 			break;
1714 		}
1715 		iblob = imsg.data;
1716 		*size = iblob->size;
1717 		*hdrlen = iblob->hdrlen;
1718 
1719 		if (datalen == sizeof(*iblob)) {
1720 			/* Data has been written to file descriptor. */
1721 			break;
1722 		}
1723 
1724 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1725 		    *size > datalen + sizeof(*iblob)) {
1726 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1727 			break;
1728 		}
1729 
1730 		*outbuf = malloc(*size);
1731 		if (*outbuf == NULL) {
1732 			err = got_error_from_errno("malloc");
1733 			break;
1734 		}
1735 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1736 		break;
1737 	default:
1738 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1739 		break;
1740 	}
1741 
1742 	imsg_free(&imsg);
1743 
1744 	return err;
1745 }
1746 
1747 static const struct got_error *
1748 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1749 {
1750 	const struct got_error *err = NULL;
1751 	size_t offset, remain;
1752 
1753 	offset = 0;
1754 	remain = tagmsg_len;
1755 	while (remain > 0) {
1756 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1757 
1758 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1759 		    tag->tagmsg + offset, n) == -1) {
1760 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1761 			break;
1762 		}
1763 
1764 		err = flush_imsg(ibuf);
1765 		if (err)
1766 			break;
1767 
1768 		offset += n;
1769 		remain -= n;
1770 	}
1771 
1772 	return err;
1773 }
1774 
1775 const struct got_error *
1776 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1777 {
1778 	const struct got_error *err = NULL;
1779 	struct got_imsg_tag_object *itag;
1780 	uint8_t *buf;
1781 	size_t len, total;
1782 	size_t tag_len = strlen(tag->tag);
1783 	size_t tagger_len = strlen(tag->tagger);
1784 	size_t tagmsg_len = strlen(tag->tagmsg);
1785 
1786 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1787 
1788 	buf = malloc(total);
1789 	if (buf == NULL)
1790 		return got_error_from_errno("malloc");
1791 
1792 	itag = (struct got_imsg_tag_object *)buf;
1793 	memcpy(&itag->id, &tag->id, sizeof(itag->id));
1794 	itag->obj_type = tag->obj_type;
1795 	itag->tag_len = tag_len;
1796 	itag->tagger_len = tagger_len;
1797 	itag->tagger_time = tag->tagger_time;
1798 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1799 	itag->tagmsg_len = tagmsg_len;
1800 
1801 	len = sizeof(*itag);
1802 	memcpy(buf + len, tag->tag, tag_len);
1803 	len += tag_len;
1804 	memcpy(buf + len, tag->tagger, tagger_len);
1805 	len += tagger_len;
1806 
1807 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1808 		err = got_error_from_errno("imsg_compose TAG");
1809 		goto done;
1810 	}
1811 
1812 	if (tagmsg_len == 0 ||
1813 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1814 		err = flush_imsg(ibuf);
1815 		if (err)
1816 			goto done;
1817 	}
1818 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1819 done:
1820 	free(buf);
1821 	return err;
1822 }
1823 
1824 const struct got_error *
1825 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1826 {
1827 	const struct got_error *err = NULL;
1828 	struct imsg imsg;
1829 	struct got_imsg_tag_object *itag;
1830 	size_t len, datalen;
1831 	const size_t min_datalen =
1832 	    MIN(sizeof(struct got_imsg_error),
1833 	    sizeof(struct got_imsg_tag_object));
1834 
1835 	*tag = NULL;
1836 
1837 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1838 	if (err)
1839 		return err;
1840 
1841 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1842 	len = 0;
1843 
1844 	switch (imsg.hdr.type) {
1845 	case GOT_IMSG_TAG:
1846 		if (datalen < sizeof(*itag)) {
1847 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1848 			break;
1849 		}
1850 		itag = imsg.data;
1851 		if (datalen != sizeof(*itag) + itag->tag_len +
1852 		    itag->tagger_len) {
1853 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1854 			break;
1855 		}
1856 		len += sizeof(*itag);
1857 
1858 		*tag = calloc(1, sizeof(**tag));
1859 		if (*tag == NULL) {
1860 			err = got_error_from_errno("calloc");
1861 			break;
1862 		}
1863 
1864 		memcpy(&(*tag)->id, &itag->id, sizeof(itag->id));
1865 
1866 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1867 		if ((*tag)->tag == NULL) {
1868 			err = got_error_from_errno("strndup");
1869 			break;
1870 		}
1871 		len += itag->tag_len;
1872 
1873 		(*tag)->obj_type = itag->obj_type;
1874 		(*tag)->tagger_time = itag->tagger_time;
1875 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1876 
1877 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1878 		if ((*tag)->tagger == NULL) {
1879 			err = got_error_from_errno("strndup");
1880 			break;
1881 		}
1882 		len += itag->tagger_len;
1883 
1884 		if (itag->tagmsg_len == 0) {
1885 			(*tag)->tagmsg = strdup("");
1886 			if ((*tag)->tagmsg == NULL) {
1887 				err = got_error_from_errno("strdup");
1888 				break;
1889 			}
1890 		} else {
1891 			size_t offset = 0, remain = itag->tagmsg_len;
1892 
1893 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1894 			if ((*tag)->tagmsg == NULL) {
1895 				err = got_error_from_errno("malloc");
1896 				break;
1897 			}
1898 			while (remain > 0) {
1899 				struct imsg imsg_log;
1900 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1901 				    remain);
1902 
1903 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1904 				if (err)
1905 					return err;
1906 
1907 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1908 					return got_error(GOT_ERR_PRIVSEP_MSG);
1909 
1910 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1911 				    n);
1912 				imsg_free(&imsg_log);
1913 				offset += n;
1914 				remain -= n;
1915 			}
1916 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1917 		}
1918 
1919 		break;
1920 	default:
1921 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1922 		break;
1923 	}
1924 
1925 	imsg_free(&imsg);
1926 
1927 	return err;
1928 }
1929 
1930 const struct got_error *
1931 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1932     struct got_packidx *packidx)
1933 {
1934 	const struct got_error *err = NULL;
1935 	struct got_imsg_packidx ipackidx;
1936 	struct got_imsg_pack ipack;
1937 	int fd;
1938 
1939 	memset(&ipackidx, 0, sizeof(ipackidx));
1940 	memset(&ipack, 0, sizeof(ipack));
1941 
1942 	ipackidx.len = packidx->len;
1943 	ipackidx.packfile_size = pack->filesize;
1944 	fd = dup(packidx->fd);
1945 	if (fd == -1)
1946 		return got_error_from_errno("dup");
1947 
1948 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1949 	    sizeof(ipackidx)) == -1) {
1950 		err = got_error_from_errno("imsg_compose PACKIDX");
1951 		close(fd);
1952 		return err;
1953 	}
1954 
1955 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1956 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1957 		return got_error(GOT_ERR_NO_SPACE);
1958 	ipack.filesize = pack->filesize;
1959 
1960 	fd = dup(pack->fd);
1961 	if (fd == -1)
1962 		return got_error_from_errno("dup");
1963 
1964 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1965 	    == -1) {
1966 		err = got_error_from_errno("imsg_compose PACK");
1967 		close(fd);
1968 		return err;
1969 	}
1970 
1971 	return flush_imsg(ibuf);
1972 }
1973 
1974 const struct got_error *
1975 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1976     struct got_object_id *id)
1977 {
1978 	struct got_imsg_packed_object iobj;
1979 
1980 	memset(&iobj, 0, sizeof(iobj));
1981 	iobj.idx = idx;
1982 	memcpy(&iobj.id, id, sizeof(iobj.id));
1983 
1984 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1985 	    &iobj, sizeof(iobj)) == -1)
1986 		return got_error_from_errno("imsg_compose "
1987 		    "PACKED_OBJECT_REQUEST");
1988 
1989 	return flush_imsg(ibuf);
1990 }
1991 
1992 const struct got_error *
1993 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1994     struct got_object_id *id)
1995 {
1996 	struct got_imsg_packed_object iobj;
1997 
1998 	memset(&iobj, 0, sizeof(iobj));
1999 	iobj.idx = idx;
2000 	memcpy(&iobj.id, id, sizeof(iobj.id));
2001 
2002 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2003 	    &iobj, sizeof(iobj)) == -1)
2004 		return got_error_from_errno("imsg_compose "
2005 		    "PACKED_OBJECT_REQUEST");
2006 
2007 	return flush_imsg(ibuf);
2008 }
2009 
2010 const struct got_error *
2011 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2012 {
2013 	const struct got_error *err = NULL;
2014 
2015 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2016 	    NULL, 0) == -1) {
2017 		err = got_error_from_errno("imsg_compose "
2018 		    "GITCONFIG_PARSE_REQUEST");
2019 		close(fd);
2020 		return err;
2021 	}
2022 
2023 	return flush_imsg(ibuf);
2024 }
2025 
2026 const struct got_error *
2027 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2028 {
2029 	if (imsg_compose(ibuf,
2030 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2031 	    NULL, 0) == -1)
2032 		return got_error_from_errno("imsg_compose "
2033 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2034 
2035 	return flush_imsg(ibuf);
2036 }
2037 
2038 const struct got_error *
2039 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2040 {
2041 	if (imsg_compose(ibuf,
2042 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2043 	    NULL, 0) == -1)
2044 		return got_error_from_errno("imsg_compose "
2045 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2046 
2047 	return flush_imsg(ibuf);
2048 }
2049 
2050 
2051 const struct got_error *
2052 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2053 {
2054 	if (imsg_compose(ibuf,
2055 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2056 		return got_error_from_errno("imsg_compose "
2057 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2058 
2059 	return flush_imsg(ibuf);
2060 }
2061 
2062 const struct got_error *
2063 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2064 {
2065 	if (imsg_compose(ibuf,
2066 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2067 		return got_error_from_errno("imsg_compose "
2068 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2069 
2070 	return flush_imsg(ibuf);
2071 }
2072 
2073 const struct got_error *
2074 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2075 {
2076 	if (imsg_compose(ibuf,
2077 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2078 		return got_error_from_errno("imsg_compose "
2079 		    "GITCONFIG_REMOTE_REQUEST");
2080 
2081 	return flush_imsg(ibuf);
2082 }
2083 
2084 const struct got_error *
2085 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2086 {
2087 	if (imsg_compose(ibuf,
2088 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2089 		return got_error_from_errno("imsg_compose "
2090 		    "GITCONFIG_OWNER_REQUEST");
2091 
2092 	return flush_imsg(ibuf);
2093 }
2094 
2095 const struct got_error *
2096 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2097 {
2098 	const struct got_error *err = NULL;
2099 	struct imsg imsg;
2100 	size_t datalen;
2101 
2102 	*str = NULL;
2103 
2104 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2105 	if (err)
2106 		return err;
2107 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2108 
2109 	switch (imsg.hdr.type) {
2110 	case GOT_IMSG_GITCONFIG_STR_VAL:
2111 		if (datalen == 0)
2112 			break;
2113 		*str = strndup(imsg.data, datalen);
2114 		if (*str == NULL) {
2115 			err = got_error_from_errno("strndup");
2116 			break;
2117 		}
2118 		break;
2119 	default:
2120 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2121 		break;
2122 	}
2123 
2124 	imsg_free(&imsg);
2125 	return err;
2126 }
2127 
2128 const struct got_error *
2129 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2130 {
2131 	const struct got_error *err = NULL;
2132 	struct got_imsg_gitconfig_pair p;
2133 	struct imsg imsg;
2134 	size_t datalen;
2135 	uint8_t *data;
2136 
2137 	*key = *val = NULL;
2138 
2139 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2140 	if (err)
2141 		return err;
2142 
2143 	data = imsg.data;
2144 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2145 
2146 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2147 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2148 		goto done;
2149 	}
2150 
2151 	if (datalen < sizeof(p)) {
2152 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2153 		goto done;
2154 	}
2155 
2156 	memcpy(&p, data, sizeof(p));
2157 	data += sizeof(p);
2158 
2159 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2160 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2161 		goto done;
2162 	}
2163 
2164 	*key = strndup(data, p.klen);
2165 	if (*key == NULL) {
2166 		err = got_error_from_errno("strndup");
2167 		goto done;
2168 	}
2169 	data += p.klen;
2170 
2171 	*val = strndup(data, p.vlen);
2172 	if (*val == NULL) {
2173 		err = got_error_from_errno("strndup");
2174 		goto done;
2175 	}
2176 
2177 done:
2178 	imsg_free(&imsg);
2179 	return err;
2180 }
2181 
2182 const struct got_error *
2183 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2184 {
2185 	const struct got_error *err = NULL;
2186 	struct imsg imsg;
2187 	size_t datalen;
2188 	const size_t min_datalen =
2189 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2190 
2191 	*val = 0;
2192 
2193 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2194 	if (err)
2195 		return err;
2196 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2197 
2198 	switch (imsg.hdr.type) {
2199 	case GOT_IMSG_GITCONFIG_INT_VAL:
2200 		if (datalen != sizeof(*val)) {
2201 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2202 			break;
2203 		}
2204 		memcpy(val, imsg.data, sizeof(*val));
2205 		break;
2206 	default:
2207 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2208 		break;
2209 	}
2210 
2211 	imsg_free(&imsg);
2212 	return err;
2213 }
2214 
2215 static void
2216 free_remote_data(struct got_remote_repo *remote)
2217 {
2218 	int i;
2219 
2220 	free(remote->name);
2221 	free(remote->fetch_url);
2222 	free(remote->send_url);
2223 	for (i = 0; i < remote->nfetch_branches; i++)
2224 		free(remote->fetch_branches[i]);
2225 	free(remote->fetch_branches);
2226 	for (i = 0; i < remote->nsend_branches; i++)
2227 		free(remote->send_branches[i]);
2228 	free(remote->send_branches);
2229 	for (i = 0; i < remote->nfetch_refs; i++)
2230 		free(remote->fetch_refs[i]);
2231 	free(remote->fetch_refs);
2232 }
2233 
2234 const struct got_error *
2235 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2236     int *nremotes, struct imsgbuf *ibuf)
2237 {
2238 	const struct got_error *err = NULL;
2239 	struct imsg imsg;
2240 	size_t datalen;
2241 	struct got_imsg_remotes iremotes;
2242 	struct got_imsg_remote iremote;
2243 
2244 	*remotes = NULL;
2245 	*nremotes = 0;
2246 	iremotes.nremotes = 0;
2247 
2248 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2249 	if (err)
2250 		return err;
2251 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2252 
2253 	switch (imsg.hdr.type) {
2254 	case GOT_IMSG_GITCONFIG_REMOTES:
2255 		if (datalen != sizeof(iremotes)) {
2256 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2257 			break;
2258 		}
2259 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2260 		if (iremotes.nremotes == 0) {
2261 			imsg_free(&imsg);
2262 			return NULL;
2263 		}
2264 		break;
2265 	default:
2266 		imsg_free(&imsg);
2267 		return got_error(GOT_ERR_PRIVSEP_MSG);
2268 	}
2269 
2270 	imsg_free(&imsg);
2271 
2272 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2273 	if (*remotes == NULL)
2274 		return got_error_from_errno("recallocarray");
2275 
2276 	while (*nremotes < iremotes.nremotes) {
2277 		struct got_remote_repo *remote;
2278 
2279 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2280 		if (err)
2281 			break;
2282 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2283 
2284 		switch (imsg.hdr.type) {
2285 		case GOT_IMSG_GITCONFIG_REMOTE:
2286 			remote = &(*remotes)[*nremotes];
2287 			memset(remote, 0, sizeof(*remote));
2288 			if (datalen < sizeof(iremote)) {
2289 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2290 				break;
2291 			}
2292 			memcpy(&iremote, imsg.data, sizeof(iremote));
2293 			if (iremote.name_len == 0 ||
2294 			    iremote.fetch_url_len == 0 ||
2295 			    iremote.send_url_len == 0 ||
2296 			    (sizeof(iremote) + iremote.name_len +
2297 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2298 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2299 				break;
2300 			}
2301 			remote->name = strndup(imsg.data + sizeof(iremote),
2302 			    iremote.name_len);
2303 			if (remote->name == NULL) {
2304 				err = got_error_from_errno("strndup");
2305 				break;
2306 			}
2307 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2308 			    iremote.name_len, iremote.fetch_url_len);
2309 			if (remote->fetch_url == NULL) {
2310 				err = got_error_from_errno("strndup");
2311 				free_remote_data(remote);
2312 				break;
2313 			}
2314 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2315 			    iremote.name_len + iremote.fetch_url_len,
2316 			    iremote.send_url_len);
2317 			if (remote->send_url == NULL) {
2318 				err = got_error_from_errno("strndup");
2319 				free_remote_data(remote);
2320 				break;
2321 			}
2322 			remote->mirror_references = iremote.mirror_references;
2323 			remote->fetch_all_branches = iremote.fetch_all_branches;
2324 			remote->nfetch_branches = 0;
2325 			remote->fetch_branches = NULL;
2326 			remote->nsend_branches = 0;
2327 			remote->send_branches = NULL;
2328 			remote->nfetch_refs = 0;
2329 			remote->fetch_refs = NULL;
2330 			(*nremotes)++;
2331 			break;
2332 		default:
2333 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2334 			break;
2335 		}
2336 
2337 		imsg_free(&imsg);
2338 		if (err)
2339 			break;
2340 	}
2341 
2342 	if (err) {
2343 		int i;
2344 		for (i = 0; i < *nremotes; i++)
2345 			free_remote_data(&(*remotes)[i]);
2346 		free(*remotes);
2347 		*remotes = NULL;
2348 		*nremotes = 0;
2349 	}
2350 	return err;
2351 }
2352 
2353 const struct got_error *
2354 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2355 {
2356 	const struct got_error *err = NULL;
2357 
2358 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2359 	    NULL, 0) == -1) {
2360 		err = got_error_from_errno("imsg_compose "
2361 		    "GOTCONFIG_PARSE_REQUEST");
2362 		close(fd);
2363 		return err;
2364 	}
2365 
2366 	return flush_imsg(ibuf);
2367 }
2368 
2369 const struct got_error *
2370 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2371 {
2372 	if (imsg_compose(ibuf,
2373 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2374 		return got_error_from_errno("imsg_compose "
2375 		    "GOTCONFIG_AUTHOR_REQUEST");
2376 
2377 	return flush_imsg(ibuf);
2378 }
2379 
2380 const struct got_error *
2381 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2382 {
2383 	if (imsg_compose(ibuf,
2384 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2385 		return got_error_from_errno("imsg_compose "
2386 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2387 
2388 	return flush_imsg(ibuf);
2389 }
2390 
2391 const struct got_error *
2392 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2393 {
2394 	if (imsg_compose(ibuf,
2395 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2396 		return got_error_from_errno("imsg_compose "
2397 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2398 
2399 	return flush_imsg(ibuf);
2400 }
2401 
2402 const struct got_error *
2403 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2404 {
2405 	if (imsg_compose(ibuf,
2406 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2407 		return got_error_from_errno("imsg_compose "
2408 		    "GOTCONFIG_SIGNERID_REQUEST");
2409 
2410 	return flush_imsg(ibuf);
2411 }
2412 
2413 const struct got_error *
2414 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2415 {
2416 	if (imsg_compose(ibuf,
2417 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2418 		return got_error_from_errno("imsg_compose "
2419 		    "GOTCONFIG_REMOTE_REQUEST");
2420 
2421 	return flush_imsg(ibuf);
2422 }
2423 
2424 const struct got_error *
2425 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2426 {
2427 	const struct got_error *err = NULL;
2428 	struct imsg imsg;
2429 	size_t datalen;
2430 
2431 	*str = NULL;
2432 
2433 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2434 	if (err)
2435 		return err;
2436 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2437 
2438 	switch (imsg.hdr.type) {
2439 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2440 		if (datalen == 0)
2441 			break;
2442 		*str = strndup(imsg.data, datalen);
2443 		if (*str == NULL) {
2444 			err = got_error_from_errno("strndup");
2445 			break;
2446 		}
2447 		break;
2448 	default:
2449 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2450 		break;
2451 	}
2452 
2453 	imsg_free(&imsg);
2454 	return err;
2455 }
2456 
2457 const struct got_error *
2458 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2459     int *nremotes, struct imsgbuf *ibuf)
2460 {
2461 	const struct got_error *err = NULL;
2462 	struct imsg imsg;
2463 	size_t datalen;
2464 	struct got_imsg_remotes iremotes;
2465 	struct got_imsg_remote iremote;
2466 	const size_t min_datalen =
2467 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2468 
2469 	*remotes = NULL;
2470 	*nremotes = 0;
2471 	iremotes.nremotes = 0;
2472 
2473 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2474 	if (err)
2475 		return err;
2476 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2477 
2478 	switch (imsg.hdr.type) {
2479 	case GOT_IMSG_GOTCONFIG_REMOTES:
2480 		if (datalen != sizeof(iremotes)) {
2481 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2482 			break;
2483 		}
2484 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2485 		if (iremotes.nremotes < 0) {
2486 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2487 			break;
2488 		}
2489 		if (iremotes.nremotes == 0) {
2490 			imsg_free(&imsg);
2491 			return NULL;
2492 		}
2493 		break;
2494 	default:
2495 		imsg_free(&imsg);
2496 		return got_error(GOT_ERR_PRIVSEP_MSG);
2497 	}
2498 
2499 	imsg_free(&imsg);
2500 
2501 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2502 	if (*remotes == NULL)
2503 		return got_error_from_errno("recallocarray");
2504 
2505 	while (*nremotes < iremotes.nremotes) {
2506 		struct got_remote_repo *remote;
2507 		const size_t min_datalen =
2508 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2509 		int i;
2510 
2511 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2512 		if (err)
2513 			break;
2514 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2515 
2516 		switch (imsg.hdr.type) {
2517 		case GOT_IMSG_GOTCONFIG_REMOTE:
2518 			remote = &(*remotes)[*nremotes];
2519 			memset(remote, 0, sizeof(*remote));
2520 			if (datalen < sizeof(iremote)) {
2521 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2522 				break;
2523 			}
2524 			memcpy(&iremote, imsg.data, sizeof(iremote));
2525 			if (iremote.name_len == 0 ||
2526 			    (iremote.fetch_url_len == 0 &&
2527 			    iremote.send_url_len == 0) ||
2528 			    (sizeof(iremote) + iremote.name_len +
2529 			    iremote.fetch_url_len + iremote.send_url_len) >
2530 			    datalen) {
2531 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2532 				break;
2533 			}
2534 			remote->name = strndup(imsg.data + sizeof(iremote),
2535 			    iremote.name_len);
2536 			if (remote->name == NULL) {
2537 				err = got_error_from_errno("strndup");
2538 				break;
2539 			}
2540 			remote->fetch_url = strndup(imsg.data +
2541 			    sizeof(iremote) + iremote.name_len,
2542 			    iremote.fetch_url_len);
2543 			if (remote->fetch_url == NULL) {
2544 				err = got_error_from_errno("strndup");
2545 				free_remote_data(remote);
2546 				break;
2547 			}
2548 			remote->send_url = strndup(imsg.data +
2549 			    sizeof(iremote) + iremote.name_len +
2550 			    iremote.fetch_url_len, iremote.send_url_len);
2551 			if (remote->send_url == NULL) {
2552 				err = got_error_from_errno("strndup");
2553 				free_remote_data(remote);
2554 				break;
2555 			}
2556 			remote->mirror_references = iremote.mirror_references;
2557 			remote->fetch_all_branches = iremote.fetch_all_branches;
2558 			if (iremote.nfetch_branches > 0) {
2559 				remote->fetch_branches = recallocarray(NULL, 0,
2560 				    iremote.nfetch_branches, sizeof(char *));
2561 				if (remote->fetch_branches == NULL) {
2562 					err = got_error_from_errno("calloc");
2563 					free_remote_data(remote);
2564 					break;
2565 				}
2566 			}
2567 			remote->nfetch_branches = 0;
2568 			for (i = 0; i < iremote.nfetch_branches; i++) {
2569 				char *branch;
2570 				err = got_privsep_recv_gotconfig_str(&branch,
2571 				    ibuf);
2572 				if (err) {
2573 					free_remote_data(remote);
2574 					goto done;
2575 				}
2576 				remote->fetch_branches[i] = branch;
2577 				remote->nfetch_branches++;
2578 			}
2579 			if (iremote.nsend_branches > 0) {
2580 				remote->send_branches = recallocarray(NULL, 0,
2581 				    iremote.nsend_branches, sizeof(char *));
2582 				if (remote->send_branches == NULL) {
2583 					err = got_error_from_errno("calloc");
2584 					free_remote_data(remote);
2585 					break;
2586 				}
2587 			}
2588 			remote->nsend_branches = 0;
2589 			for (i = 0; i < iremote.nsend_branches; i++) {
2590 				char *branch;
2591 				err = got_privsep_recv_gotconfig_str(&branch,
2592 				    ibuf);
2593 				if (err) {
2594 					free_remote_data(remote);
2595 					goto done;
2596 				}
2597 				remote->send_branches[i] = branch;
2598 				remote->nsend_branches++;
2599 			}
2600 			if (iremote.nfetch_refs > 0) {
2601 				remote->fetch_refs = recallocarray(NULL, 0,
2602 				    iremote.nfetch_refs, sizeof(char *));
2603 				if (remote->fetch_refs == NULL) {
2604 					err = got_error_from_errno("calloc");
2605 					free_remote_data(remote);
2606 					break;
2607 				}
2608 			}
2609 			remote->nfetch_refs = 0;
2610 			for (i = 0; i < iremote.nfetch_refs; i++) {
2611 				char *ref;
2612 				err = got_privsep_recv_gotconfig_str(&ref,
2613 				    ibuf);
2614 				if (err) {
2615 					free_remote_data(remote);
2616 					goto done;
2617 				}
2618 				remote->fetch_refs[i] = ref;
2619 				remote->nfetch_refs++;
2620 			}
2621 			(*nremotes)++;
2622 			break;
2623 		default:
2624 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2625 			break;
2626 		}
2627 
2628 		imsg_free(&imsg);
2629 		if (err)
2630 			break;
2631 	}
2632 done:
2633 	if (err) {
2634 		int i;
2635 		for (i = 0; i < *nremotes; i++)
2636 			free_remote_data(&(*remotes)[i]);
2637 		free(*remotes);
2638 		*remotes = NULL;
2639 		*nremotes = 0;
2640 	}
2641 	return err;
2642 }
2643 
2644 const struct got_error *
2645 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2646     struct got_object_id *id, int idx, const char *path)
2647 {
2648 	struct ibuf *wbuf;
2649 	size_t path_len = strlen(path);
2650 
2651 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2652 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2653 	if (wbuf == NULL)
2654 		return got_error_from_errno(
2655 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2656 	/*
2657 	 * Keep in sync with struct got_imsg_commit_traversal_request
2658 	 * and struct got_imsg_packed_object.
2659 	 */
2660 	if (imsg_add(wbuf, id, sizeof(*id)) == -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_len, sizeof(path_len)) == -1)
2667 		return got_error_from_errno("imsg_add "
2668 		    "COMMIT_TRAVERSAL_REQUEST");
2669 	if (imsg_add(wbuf, path, path_len) == -1)
2670 		return got_error_from_errno("imsg_add "
2671 		    "COMMIT_TRAVERSAL_REQUEST");
2672 
2673 	wbuf->fd = -1;
2674 	imsg_close(ibuf, wbuf);
2675 
2676 	return flush_imsg(ibuf);
2677 }
2678 
2679 const struct got_error *
2680 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2681     struct got_object_id **changed_commit_id,
2682     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2683 {
2684 	const struct got_error *err = NULL;
2685 	struct imsg imsg;
2686 	struct got_imsg_traversed_commits *icommits;
2687 	struct got_object_id *ids;
2688 	size_t datalen;
2689 	int i, done = 0;
2690 
2691 	*changed_commit = NULL;
2692 	*changed_commit_id = NULL;
2693 
2694 	while (!done) {
2695 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2696 		if (err)
2697 			return err;
2698 
2699 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2700 		switch (imsg.hdr.type) {
2701 		case GOT_IMSG_TRAVERSED_COMMITS:
2702 			icommits = imsg.data;
2703 			if (datalen != sizeof(*icommits) +
2704 			    icommits->ncommits * sizeof(*ids)) {
2705 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2706 				break;
2707 			}
2708 			ids = imsg.data + sizeof(*icommits);
2709 			for (i = 0; i < icommits->ncommits; i++) {
2710 				struct got_object_qid *qid;
2711 
2712 				err = got_object_qid_alloc_partial(&qid);
2713 				if (err)
2714 					break;
2715 				memcpy(&qid->id, &ids[i], sizeof(ids[i]));
2716 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2717 
2718 				/* The last commit may contain a change. */
2719 				if (i == icommits->ncommits - 1) {
2720 					*changed_commit_id =
2721 					    got_object_id_dup(&qid->id);
2722 					if (*changed_commit_id == NULL) {
2723 						err = got_error_from_errno(
2724 						    "got_object_id_dup");
2725 						break;
2726 					}
2727 				}
2728 			}
2729 			break;
2730 		case GOT_IMSG_COMMIT:
2731 			if (*changed_commit_id == NULL) {
2732 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2733 				break;
2734 			}
2735 			err = get_commit_from_imsg(changed_commit, &imsg,
2736 			    datalen, ibuf);
2737 			break;
2738 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2739 			done = 1;
2740 			break;
2741 		default:
2742 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2743 			break;
2744 		}
2745 
2746 		imsg_free(&imsg);
2747 		if (err)
2748 			break;
2749 	}
2750 
2751 	if (err)
2752 		got_object_id_queue_free(commit_ids);
2753 	return err;
2754 }
2755 
2756 const struct got_error *
2757 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2758     struct got_object_id *tree_id, const char *path,
2759     struct got_parsed_tree_entry *entries, int nentries)
2760 {
2761 	const struct got_error *err = NULL;
2762 	struct ibuf *wbuf;
2763 	size_t path_len = strlen(path);
2764 	size_t msglen;
2765 
2766 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2767 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2768 	if (wbuf == NULL)
2769 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2770 
2771 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2772 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2773 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2774 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2775 	if (imsg_add(wbuf, path, path_len) == -1)
2776 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2777 
2778 	wbuf->fd = -1;
2779 	imsg_close(ibuf, wbuf);
2780 
2781 	if (entries) {
2782 		err = send_tree_entries(ibuf, entries, nentries);
2783 		if (err)
2784 			return err;
2785 	}
2786 
2787 	return flush_imsg(ibuf);
2788 }
2789 
2790 const struct got_error *
2791 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2792 {
2793 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2794 	    0, 0, -1, NULL, 0) == -1)
2795 		return got_error_from_errno("imsg_compose "
2796 		    "OBJECT_ENUMERATION_REQUEST");
2797 
2798 	return flush_imsg(ibuf);
2799 }
2800 
2801 const struct got_error *
2802 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2803 {
2804 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2805 	    0, 0, -1, NULL, 0) == -1)
2806 		return got_error_from_errno("imsg_compose "
2807 		    "OBJECT_ENUMERATION_DONE");
2808 
2809 	return flush_imsg(ibuf);
2810 }
2811 
2812 const struct got_error *
2813 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2814 {
2815 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2816 	    0, 0, -1, NULL, 0) == -1)
2817 		return got_error_from_errno("imsg_compose "
2818 		    "OBJECT_ENUMERATION_INCOMPLETE");
2819 
2820 	return flush_imsg(ibuf);
2821 }
2822 
2823 const struct got_error *
2824 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2825     struct got_object_id *id, time_t mtime)
2826 {
2827 	struct ibuf *wbuf;
2828 
2829 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2830 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2831 	if (wbuf == NULL)
2832 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2833 
2834 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2835 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2836 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2837 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2838 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2839 
2840 	wbuf->fd = -1;
2841 	imsg_close(ibuf, wbuf);
2842 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2843 	return NULL;
2844 }
2845 
2846 const struct got_error *
2847 got_privsep_recv_enumerated_objects(int *found_all_objects,
2848     struct imsgbuf *ibuf,
2849     got_object_enumerate_commit_cb cb_commit,
2850     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2851     struct got_repository *repo)
2852 {
2853 	const struct got_error *err = NULL;
2854 	struct imsg imsg;
2855 	struct got_imsg_enumerated_commit *icommit = NULL;
2856 	struct got_object_id commit_id;
2857 	int have_commit = 0;
2858 	time_t mtime = 0;
2859 	struct got_tree_object tree;
2860 	struct got_imsg_enumerated_tree *itree;
2861 	struct got_object_id tree_id;
2862 	char *path = NULL, *canon_path = NULL;
2863 	size_t datalen, path_len;
2864 	int nentries = -1;
2865 	int done = 0;
2866 
2867 	*found_all_objects = 0;
2868 	memset(&tree, 0, sizeof(tree));
2869 
2870 	while (!done) {
2871 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2872 		if (err)
2873 			break;
2874 
2875 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2876 		switch (imsg.hdr.type) {
2877 		case GOT_IMSG_ENUMERATED_COMMIT:
2878 			if (have_commit && nentries != -1) {
2879 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2880 				break;
2881 			}
2882 			if (datalen != sizeof(*icommit)) {
2883 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2884 				break;
2885 			}
2886 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2887 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2888 			mtime = icommit->mtime;
2889 			have_commit = 1;
2890 			break;
2891 		case GOT_IMSG_ENUMERATED_TREE:
2892 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2893 			if (!have_commit) {
2894 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2895 				break;
2896 			}
2897 			if (datalen < sizeof(*itree)) {
2898 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2899 				break;
2900 			}
2901 			itree = imsg.data;
2902 			path_len = datalen - sizeof(*itree);
2903 			if (path_len == 0) {
2904 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2905 				break;
2906 			}
2907 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2908 			free(path);
2909 			path = strndup(imsg.data + sizeof(*itree), path_len);
2910 			if (path == NULL) {
2911 				err = got_error_from_errno("strndup");
2912 				break;
2913 			}
2914 			free(canon_path);
2915 			canon_path = malloc(path_len + 1);
2916 			if (canon_path == NULL) {
2917 				err = got_error_from_errno("malloc");
2918 				break;
2919 			}
2920 			if (!got_path_is_absolute(path)) {
2921 				err = got_error(GOT_ERR_BAD_PATH);
2922 				break;
2923 			}
2924 			if (got_path_is_root_dir(path)) {
2925 				/* XXX check what got_canonpath() does wrong */
2926 				canon_path[0] = '/';
2927 				canon_path[1] = '\0';
2928 			} else {
2929 				err = got_canonpath(path, canon_path,
2930 				    path_len + 1);
2931 				if (err)
2932 					break;
2933 			}
2934 			if (strcmp(path, canon_path) != 0) {
2935 				err = got_error(GOT_ERR_BAD_PATH);
2936 				break;
2937 			}
2938 			if (nentries != -1) {
2939 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2940 				break;
2941 			}
2942 			if (itree->nentries < -1) {
2943 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2944 				break;
2945 			}
2946 			if (itree->nentries == -1) {
2947 				/* Tree was not found in pack file. */
2948 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2949 				    path, repo);
2950 				break;
2951 			}
2952 			if (itree->nentries > INT_MAX) {
2953 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2954 				break;
2955 			}
2956 			tree.entries = calloc(itree->nentries,
2957 			    sizeof(struct got_tree_entry));
2958 			if (tree.entries == NULL) {
2959 				err = got_error_from_errno("calloc");
2960 				break;
2961 			}
2962 			if (itree->nentries == 0) {
2963 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2964 				    path, repo);
2965 				if (err)
2966 					break;
2967 
2968 				/* Prepare for next tree. */
2969 				free(tree.entries);
2970 				memset(&tree, 0, sizeof(tree));
2971 				nentries = -1;
2972 			} else {
2973 				tree.nentries = itree->nentries;
2974 				nentries = 0;
2975 			}
2976 			break;
2977 		case GOT_IMSG_TREE_ENTRIES:
2978 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2979 			if (nentries <= -1) {
2980 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2981 				break;
2982 			}
2983 			err = recv_tree_entries(imsg.data, datalen,
2984 			    &tree, &nentries);
2985 			if (err)
2986 				break;
2987 			if (tree.nentries == nentries) {
2988 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2989 				    path, repo);
2990 				if (err)
2991 					break;
2992 
2993 				/* Prepare for next tree. */
2994 				free(tree.entries);
2995 				memset(&tree, 0, sizeof(tree));
2996 				nentries = -1;
2997 			}
2998 			break;
2999 		case GOT_IMSG_TREE_ENUMERATION_DONE:
3000 			/* All trees have been found and traversed. */
3001 			if (!have_commit || path == NULL || nentries != -1) {
3002 				err = got_error(GOT_ERR_PRIVSEP_MSG);
3003 				break;
3004 			}
3005 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
3006 			if (err)
3007 				break;
3008 			have_commit = 0;
3009 			break;
3010 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
3011 			*found_all_objects = 1;
3012 			done = 1;
3013 			break;
3014 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
3015 			done = 1;
3016 			break;
3017 		default:
3018 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3019 			break;
3020 		}
3021 
3022 		imsg_free(&imsg);
3023 		if (err)
3024 			break;
3025 	}
3026 
3027 	free(path);
3028 	free(canon_path);
3029 	free(tree.entries);
3030 	return err;
3031 }
3032 
3033 const struct got_error *
3034 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3035     struct got_object_id *id)
3036 {
3037 	struct got_imsg_raw_delta_request dreq;
3038 
3039 	memset(&dreq, 0, sizeof(dreq));
3040 	dreq.idx = idx;
3041 	memcpy(&dreq.id, id, sizeof(dreq.id));
3042 
3043 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3044 	    &dreq, sizeof(dreq)) == -1)
3045 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3046 
3047 	return flush_imsg(ibuf);
3048 }
3049 
3050 const struct got_error *
3051 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3052 {
3053 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3054 }
3055 
3056 const struct got_error *
3057 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3058     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3059     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3060 {
3061 	struct got_imsg_raw_delta idelta;
3062 	int ret;
3063 
3064 	memset(&idelta, 0, sizeof(idelta));
3065 	idelta.base_size = base_size;
3066 	idelta.result_size = result_size;
3067 	idelta.delta_size = delta_size;
3068 	idelta.delta_compressed_size = delta_compressed_size;
3069 	idelta.delta_offset = delta_offset;
3070 	idelta.delta_out_offset = delta_out_offset;
3071 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3072 
3073 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3074 	    &idelta, sizeof(idelta));
3075 	if (ret == -1)
3076 		return got_error_from_errno("imsg_compose RAW_DELTA");
3077 
3078 	return flush_imsg(ibuf);
3079 }
3080 
3081 const struct got_error *
3082 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3083     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3084     off_t *delta_out_offset, struct got_object_id **base_id,
3085     struct imsgbuf *ibuf)
3086 {
3087 	const struct got_error *err = NULL;
3088 	struct imsg imsg;
3089 	struct got_imsg_raw_delta *delta;
3090 	size_t datalen;
3091 
3092 	*base_size = 0;
3093 	*result_size = 0;
3094 	*delta_size = 0;
3095 	*delta_compressed_size = 0;
3096 	*delta_offset = 0;
3097 	*delta_out_offset = 0;
3098 	*base_id = NULL;
3099 
3100 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3101 	if (err)
3102 		return err;
3103 
3104 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3105 
3106 	switch (imsg.hdr.type) {
3107 	case GOT_IMSG_RAW_DELTA:
3108 		if (datalen != sizeof(*delta)) {
3109 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3110 			break;
3111 		}
3112 		delta = imsg.data;
3113 		*base_size = delta->base_size;
3114 		*result_size = delta->result_size;
3115 		*delta_size = delta->delta_size;
3116 		*delta_compressed_size = delta->delta_compressed_size;
3117 		*delta_offset = delta->delta_offset;
3118 		*delta_out_offset = delta->delta_out_offset;
3119 		*base_id = calloc(1, sizeof(**base_id));
3120 		if (*base_id == NULL) {
3121 			err = got_error_from_errno("malloc");
3122 			break;
3123 		}
3124 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3125 		break;
3126 	default:
3127 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3128 		break;
3129 	}
3130 
3131 	imsg_free(&imsg);
3132 
3133 	if (err) {
3134 		free(*base_id);
3135 		*base_id = NULL;
3136 	}
3137 	return err;
3138 }
3139 
3140 static const struct got_error *
3141 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3142 {
3143 	const struct got_error *err = NULL;
3144 	struct got_imsg_object_idlist idlist;
3145 	struct ibuf *wbuf;
3146 	size_t i;
3147 
3148 	memset(&idlist, 0, sizeof(idlist));
3149 
3150 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3151 		return got_error(GOT_ERR_NO_SPACE);
3152 
3153 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3154 	    sizeof(idlist) + nids * sizeof(**ids));
3155 	if (wbuf == NULL) {
3156 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3157 		return err;
3158 	}
3159 
3160 	idlist.nids = nids;
3161 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3162 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3163 
3164 	for (i = 0; i < nids; i++) {
3165 		struct got_object_id *id = ids[i];
3166 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3167 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3168 	}
3169 
3170 	wbuf->fd = -1;
3171 	imsg_close(ibuf, wbuf);
3172 
3173 	return flush_imsg(ibuf);
3174 }
3175 
3176 const struct got_error *
3177 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3178     struct got_object_id **ids, size_t nids)
3179 {
3180 	const struct got_error *err = NULL;
3181 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3182 	int i, queued = 0;
3183 
3184 	for (i = 0; i < nids; i++) {
3185 		idlist[i % nitems(idlist)] = ids[i];
3186 		queued++;
3187 		if (queued >= nitems(idlist)) {
3188 			err = send_idlist(ibuf, idlist, queued);
3189 			if (err)
3190 				return err;
3191 			queued = 0;
3192 		}
3193 	}
3194 
3195 	if (queued > 0) {
3196 		err = send_idlist(ibuf, idlist, queued);
3197 		if (err)
3198 			return err;
3199 	}
3200 
3201 	return NULL;
3202 }
3203 
3204 const struct got_error *
3205 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3206 {
3207 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3208 	    == -1)
3209 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3210 
3211 	return flush_imsg(ibuf);
3212 }
3213 
3214 const struct got_error *
3215 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3216     size_t *nids, struct imsgbuf *ibuf)
3217 {
3218 	const struct got_error *err = NULL;
3219 	struct imsg imsg;
3220 	struct got_imsg_object_idlist *idlist;
3221 	size_t datalen;
3222 
3223 	*ids = NULL;
3224 	*done = 0;
3225 	*nids = 0;
3226 
3227 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3228 	if (err)
3229 		return err;
3230 
3231 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3232 	switch (imsg.hdr.type) {
3233 	case GOT_IMSG_OBJ_ID_LIST:
3234 		if (datalen < sizeof(*idlist)) {
3235 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3236 			break;
3237 		}
3238 		idlist = imsg.data;
3239 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3240 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3241 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3242 			break;
3243 		}
3244 		*nids = idlist->nids;
3245 		*ids = calloc(*nids, sizeof(**ids));
3246 		if (*ids == NULL) {
3247 			err = got_error_from_errno("calloc");
3248 			break;
3249 		}
3250 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3251 		    *nids * sizeof(**ids));
3252 		break;
3253 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3254 		*done = 1;
3255 		break;
3256 	default:
3257 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3258 		break;
3259 	}
3260 
3261 	imsg_free(&imsg);
3262 
3263 	return err;
3264 }
3265 
3266 const struct got_error *
3267 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3268 {
3269 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3270 	    == -1)
3271 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3272 
3273 	return flush_imsg(ibuf);
3274 }
3275 
3276 const struct got_error *
3277 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3278     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3279 {
3280 	const struct got_error *err = NULL;
3281 	struct ibuf *wbuf;
3282 	struct got_imsg_reused_deltas ideltas;
3283 	size_t i;
3284 
3285 	memset(&ideltas, 0, sizeof(ideltas));
3286 
3287 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3288 		return got_error(GOT_ERR_NO_SPACE);
3289 
3290 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3291 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3292 	if (wbuf == NULL) {
3293 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3294 		return err;
3295 	}
3296 
3297 	ideltas.ndeltas = ndeltas;
3298 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3299 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3300 
3301 	for (i = 0; i < ndeltas; i++) {
3302 		struct got_imsg_reused_delta *delta = &deltas[i];
3303 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3304 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3305 	}
3306 
3307 	wbuf->fd = -1;
3308 	imsg_close(ibuf, wbuf);
3309 
3310 	return flush_imsg(ibuf);
3311 }
3312 
3313 const struct got_error *
3314 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3315 {
3316 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3317 	    == -1)
3318 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3319 
3320 	return flush_imsg(ibuf);
3321 }
3322 
3323 const struct got_error *
3324 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3325     size_t *ndeltas, struct imsgbuf *ibuf)
3326 {
3327 	const struct got_error *err = NULL;
3328 	struct imsg imsg;
3329 	struct got_imsg_reused_deltas *ideltas;
3330 	size_t datalen;
3331 
3332 	*done = 0;
3333 	*ndeltas = 0;
3334 
3335 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3336 	if (err)
3337 		return err;
3338 
3339 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3340 	switch (imsg.hdr.type) {
3341 	case GOT_IMSG_REUSED_DELTAS:
3342 		if (datalen < sizeof(*ideltas)) {
3343 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3344 			break;
3345 		}
3346 		ideltas = imsg.data;
3347 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3348 		    ideltas->ndeltas * sizeof(*deltas) >
3349 		    datalen - sizeof(*ideltas)) {
3350 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3351 			break;
3352 		}
3353 		*ndeltas = ideltas->ndeltas;
3354 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3355 		    *ndeltas * sizeof(*deltas));
3356 		break;
3357 	case GOT_IMSG_DELTA_REUSE_DONE:
3358 		*done = 1;
3359 		break;
3360 	default:
3361 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3362 		break;
3363 	}
3364 
3365 	imsg_free(&imsg);
3366 
3367 	return err;
3368 }
3369 
3370 const struct got_error *
3371 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3372 {
3373 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3374 	    0, 0, -1, NULL, 0)
3375 	    == -1)
3376 		return got_error_from_errno("imsg_compose "
3377 		    "COMMIT_PAINTING_INIT");
3378 
3379 	return flush_imsg(ibuf);
3380 }
3381 
3382 const struct got_error *
3383 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3384     struct got_object_id *id, intptr_t color)
3385 {
3386 	struct got_imsg_commit_painting_request ireq;
3387 
3388 	memset(&ireq, 0, sizeof(ireq));
3389 	memcpy(&ireq.id, id, sizeof(ireq.id));
3390 	ireq.idx = idx;
3391 	ireq.color = color;
3392 
3393 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3394 	    &ireq, sizeof(ireq)) == -1)
3395 		return got_error_from_errno("imsg_compose "
3396 		    "COMMIT_PAINTING_REQUEST");
3397 
3398 	return flush_imsg(ibuf);
3399 }
3400 
3401 static const struct got_error *
3402 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3403     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3404 {
3405 	const struct got_error *err = NULL;
3406 	struct ibuf *wbuf = NULL;
3407 	struct got_object_qid *qid;
3408 	size_t msglen;
3409 	int ncommits;
3410 	intptr_t color;
3411 
3412 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3413 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3414 	    sizeof(struct got_imsg_painted_commit);
3415 
3416 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3417 	if (wbuf == NULL) {
3418 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3419 		return err;
3420 	}
3421 
3422 	/* Keep in sync with struct got_imsg_painted_commits! */
3423 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3424 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3425 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3426 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3427 
3428 	while (ncommits > 0) {
3429 		qid = STAILQ_FIRST(ids);
3430 		STAILQ_REMOVE_HEAD(ids, entry);
3431 		ncommits--;
3432 		(*nids)--;
3433 		color = (intptr_t)qid->data;
3434 
3435 		/* Keep in sync with struct got_imsg_painted_commit! */
3436 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3437 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3438 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3439 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3440 
3441 		got_object_qid_free(qid);
3442 	}
3443 
3444 	wbuf->fd = -1;
3445 	imsg_close(ibuf, wbuf);
3446 
3447 	return flush_imsg(ibuf);
3448 }
3449 
3450 const struct got_error *
3451 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3452     struct got_object_id_queue *ids, int *nids,
3453     int present_in_pack, int flush)
3454 {
3455 	const struct got_error *err;
3456 	size_t remain;
3457 
3458 	if (*nids <= 0)
3459 		return NULL;
3460 
3461 	do {
3462 		remain = (sizeof(struct got_imsg_painted_commits)) +
3463 		    *nids * sizeof(struct got_imsg_painted_commit);
3464 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3465 			err = send_painted_commits(ids, nids, remain,
3466 			    present_in_pack, ibuf);
3467 			if (err)
3468 				return err;
3469 		}
3470 	} while (flush && *nids > 0);
3471 
3472 	return NULL;
3473 }
3474 
3475 const struct got_error *
3476 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3477 {
3478 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3479 	    0, 0, -1, NULL, 0)
3480 	    == -1)
3481 		return got_error_from_errno("imsg_compose "
3482 		    "COMMIT_PAINTING_DONE");
3483 
3484 	return flush_imsg(ibuf);
3485 }
3486 
3487 const struct got_error *
3488 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3489     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3490 {
3491 	const struct got_error *err = NULL;
3492 	struct imsg imsg;
3493 	struct got_imsg_painted_commits icommits;
3494 	struct got_imsg_painted_commit icommit;
3495 	size_t datalen;
3496 	int i;
3497 
3498 	for (;;) {
3499 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3500 		if (err)
3501 			return err;
3502 
3503 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3504 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3505 			break;
3506 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3507 			return got_error(GOT_ERR_PRIVSEP_MSG);
3508 
3509 		if (datalen < sizeof(icommits))
3510 			return got_error(GOT_ERR_PRIVSEP_LEN);
3511 		memcpy(&icommits, imsg.data, sizeof(icommits));
3512 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3513 		    datalen < sizeof(icommits) +
3514 		    icommits.ncommits * sizeof(icommit))
3515 			return got_error(GOT_ERR_PRIVSEP_LEN);
3516 
3517 		for (i = 0; i < icommits.ncommits; i++) {
3518 			memcpy(&icommit,
3519 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3520 			    sizeof(icommit));
3521 
3522 			if (icommits.present_in_pack) {
3523 				struct got_object_id id;
3524 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3525 				err = cb(cb_arg, &id, icommit.color);
3526 				if (err)
3527 					break;
3528 			} else {
3529 				struct got_object_qid *qid;
3530 				err = got_object_qid_alloc_partial(&qid);
3531 				if (err)
3532 					break;
3533 				memcpy(qid->id.sha1, icommit.id,
3534 				    SHA1_DIGEST_LENGTH);
3535 				qid->data = (void *)icommit.color;
3536 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3537 			}
3538 		}
3539 
3540 		imsg_free(&imsg);
3541 	}
3542 
3543 	return err;
3544 }
3545 
3546 const struct got_error *
3547 got_privsep_unveil_exec_helpers(void)
3548 {
3549 	const char *helpers[] = {
3550 	    GOT_PATH_PROG_READ_PACK,
3551 	    GOT_PATH_PROG_READ_OBJECT,
3552 	    GOT_PATH_PROG_READ_COMMIT,
3553 	    GOT_PATH_PROG_READ_TREE,
3554 	    GOT_PATH_PROG_READ_BLOB,
3555 	    GOT_PATH_PROG_READ_TAG,
3556 	    GOT_PATH_PROG_READ_GITCONFIG,
3557 	    GOT_PATH_PROG_READ_GOTCONFIG,
3558 	    GOT_PATH_PROG_READ_PATCH,
3559 	    GOT_PATH_PROG_FETCH_PACK,
3560 	    GOT_PATH_PROG_INDEX_PACK,
3561 	    GOT_PATH_PROG_SEND_PACK,
3562 	};
3563 	size_t i;
3564 
3565 	for (i = 0; i < nitems(helpers); i++) {
3566 		if (unveil(helpers[i], "x") == 0)
3567 			continue;
3568 		return got_error_from_errno2("unveil", helpers[i]);
3569 	}
3570 
3571 	return NULL;
3572 }
3573 
3574 void
3575 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3576 {
3577 	if (close(imsg_fds[0]) == -1) {
3578 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3579 		_exit(1);
3580 	}
3581 
3582 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3583 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3584 		_exit(1);
3585 	}
3586 
3587 	closefrom(GOT_IMSG_FD_CHILD + 1);
3588 
3589 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3590 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3591 		    strerror(errno));
3592 		_exit(1);
3593 	}
3594 }