1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <sha2.h>
35 #include <unistd.h>
36 #include <zlib.h>
37 
38 #include "got_compat.h"
39 
40 #include "got_object.h"
41 #include "got_error.h"
42 #include "got_path.h"
43 #include "got_repository.h"
44 
45 #include "got_lib_sha1.h"
46 #include "got_lib_delta.h"
47 #include "got_lib_inflate.h"
48 #include "got_lib_object.h"
49 #include "got_lib_object_parse.h"
50 #include "got_lib_privsep.h"
51 #include "got_lib_pack.h"
52 #include "got_lib_poll.h"
53 
54 #include "got_privsep.h"
55 
56 #ifndef MIN
57 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
58 #endif
59 
60 #ifndef nitems
61 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
62 #endif
63 
64 static const struct got_error *
65 read_imsg(struct imsgbuf *ibuf)
66 {
67 	const struct got_error *err;
68 	size_t n;
69 
70 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
71 	if (err) {
72 		if (err->code == GOT_ERR_EOF)
73 			return got_error(GOT_ERR_PRIVSEP_PIPE);
74 		return err;
75 	}
76 
77 	n = imsg_read(ibuf);
78 	if (n == -1) {
79 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
80 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
81 		return got_error(GOT_ERR_PRIVSEP_READ);
82 	}
83 	if (n == 0)
84 		return got_error(GOT_ERR_PRIVSEP_PIPE);
85 
86 	return NULL;
87 }
88 
89 const struct got_error *
90 got_privsep_wait_for_child(pid_t pid)
91 {
92 	int child_status;
93 
94 	if (waitpid(pid, &child_status, 0) == -1)
95 		return got_error_from_errno("waitpid");
96 
97 	if (!WIFEXITED(child_status))
98 		return got_error(GOT_ERR_PRIVSEP_DIED);
99 
100 	if (WEXITSTATUS(child_status) != 0)
101 		return got_error(GOT_ERR_PRIVSEP_EXIT);
102 
103 	return NULL;
104 }
105 
106 static const struct got_error *
107 recv_imsg_error(struct imsg *imsg, size_t datalen)
108 {
109 	struct got_imsg_error *ierr;
110 
111 	if (datalen != sizeof(*ierr))
112 		return got_error(GOT_ERR_PRIVSEP_LEN);
113 
114 	ierr = imsg->data;
115 	if (ierr->code == GOT_ERR_ERRNO) {
116 		static struct got_error serr;
117 		serr.code = GOT_ERR_ERRNO;
118 		serr.msg = strerror(ierr->errno_code);
119 		return &serr;
120 	}
121 
122 	return got_error(ierr->code);
123 }
124 
125 const struct got_error *
126 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
127     size_t min_datalen)
128 {
129 	const struct got_error *err;
130 	ssize_t n;
131 
132 	n = imsg_get(ibuf, imsg);
133 	if (n == -1)
134 		return got_error_from_errno("imsg_get");
135 
136 	while (n == 0) {
137 		err = read_imsg(ibuf);
138 		if (err)
139 			return err;
140 		n = imsg_get(ibuf, imsg);
141 		if (n == -1)
142 			return got_error_from_errno("imsg_get");
143 	}
144 
145 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
146 		return got_error(GOT_ERR_PRIVSEP_LEN);
147 
148 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
149 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
150 		return recv_imsg_error(imsg, datalen);
151 	}
152 
153 	return NULL;
154 }
155 
156 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
157 void
158 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
159 {
160 	const struct got_error *poll_err;
161 	struct got_imsg_error ierr;
162 	int ret;
163 
164 	ierr.code = err->code;
165 	if (err->code == GOT_ERR_ERRNO)
166 		ierr.errno_code = errno;
167 	else
168 		ierr.errno_code = 0;
169 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
170 	if (ret == -1) {
171 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
172 		    getprogname(), err->code, err->msg, strerror(errno));
173 		return;
174 	}
175 
176 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
177 	if (poll_err) {
178 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
179 		    getprogname(), err->code, err->msg, poll_err->msg);
180 		return;
181 	}
182 
183 	ret = imsg_flush(ibuf);
184 	if (ret == -1) {
185 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
186 		    getprogname(), err->code, err->msg, strerror(errno));
187 		imsg_clear(ibuf);
188 		return;
189 	}
190 }
191 
192 static const struct got_error *
193 flush_imsg(struct imsgbuf *ibuf)
194 {
195 	const struct got_error *err;
196 
197 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
198 	if (err)
199 		return err;
200 
201 	if (imsg_flush(ibuf) == -1) {
202 		imsg_clear(ibuf);
203 		return got_error_from_errno("imsg_flush");
204 	}
205 
206 	return NULL;
207 }
208 
209 const struct got_error *
210 got_privsep_flush_imsg(struct imsgbuf *ibuf)
211 {
212 	return flush_imsg(ibuf);
213 }
214 
215 const struct got_error *
216 got_privsep_send_stop(int fd)
217 {
218 	const struct got_error *err = NULL;
219 	struct imsgbuf ibuf;
220 
221 	imsg_init(&ibuf, fd);
222 
223 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
224 		return got_error_from_errno("imsg_compose STOP");
225 
226 	err = flush_imsg(&ibuf);
227 	return err;
228 }
229 
230 const struct got_error *
231 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
232     struct got_object_id *id)
233 {
234 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
235 	    id, sizeof(*id)) == -1)
236 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
237 
238 	return flush_imsg(ibuf);
239 }
240 
241 const struct got_error *
242 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
243     struct got_object_id *id)
244 {
245 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
246 	    id, sizeof(*id)) == -1)
247 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
248 
249 	return flush_imsg(ibuf);
250 }
251 
252 const struct got_error *
253 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
254 {
255 	const struct got_error *err = NULL;
256 
257 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
258 	    == -1) {
259 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
260 		close(outfd);
261 		return err;
262 	}
263 
264 	return flush_imsg(ibuf);
265 }
266 
267 const struct got_error *
268 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
269     uint8_t *data)
270 {
271 	const struct got_error *err = NULL;
272 	struct got_imsg_raw_obj iobj;
273 	size_t len = sizeof(iobj);
274 	struct ibuf *wbuf;
275 
276 	memset(&iobj, 0, sizeof(iobj));
277 	iobj.hdrlen = hdrlen;
278 	iobj.size = size;
279 
280 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
281 		len += (size_t)size + hdrlen;
282 
283 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
284 	if (wbuf == NULL) {
285 		err = got_error_from_errno("imsg_create RAW_OBJECT");
286 		return err;
287 	}
288 
289 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
290 		return got_error_from_errno("imsg_add RAW_OBJECT");
291 
292 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
293 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
294 			return got_error_from_errno("imsg_add RAW_OBJECT");
295 	}
296 
297 	wbuf->fd = -1;
298 	imsg_close(ibuf, wbuf);
299 
300 	return flush_imsg(ibuf);
301 }
302 
303 const struct got_error *
304 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
305     struct imsgbuf *ibuf)
306 {
307 	const struct got_error *err = NULL;
308 	struct imsg imsg;
309 	struct got_imsg_raw_obj *iobj;
310 	size_t datalen;
311 
312 	*outbuf = NULL;
313 
314 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
315 	if (err)
316 		return err;
317 
318 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
319 
320 	switch (imsg.hdr.type) {
321 	case GOT_IMSG_RAW_OBJECT:
322 		if (datalen < sizeof(*iobj)) {
323 			err = got_error(GOT_ERR_PRIVSEP_LEN);
324 			break;
325 		}
326 		iobj = imsg.data;
327 		*size = iobj->size;
328 		*hdrlen = iobj->hdrlen;
329 
330 		if (datalen == sizeof(*iobj)) {
331 			/* Data has been written to file descriptor. */
332 			break;
333 		}
334 
335 		if (*size < 0 ||
336 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
337 			err = got_error(GOT_ERR_PRIVSEP_LEN);
338 			break;
339 		}
340 
341 		*outbuf = malloc(*size + *hdrlen);
342 		if (*outbuf == NULL) {
343 			err = got_error_from_errno("malloc");
344 			break;
345 		}
346 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
347 		break;
348 	default:
349 		err = got_error(GOT_ERR_PRIVSEP_MSG);
350 		break;
351 	}
352 
353 	imsg_free(&imsg);
354 
355 	return err;
356 }
357 
358 const struct got_error *
359 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
360     struct got_object_id *id, int pack_idx)
361 {
362 	const struct got_error *err = NULL;
363 	struct got_imsg_packed_object iobj;
364 	void *data;
365 	size_t len;
366 
367 	memset(&iobj, 0, sizeof(iobj));
368 	if (pack_idx != -1) { /* commit is packed */
369 		iobj.idx = pack_idx;
370 		memcpy(&iobj.id, id, sizeof(iobj.id));
371 		data = &iobj;
372 		len = sizeof(iobj);
373 	} else {
374 		data = id;
375 		len = sizeof(*id);
376 	}
377 
378 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
379 	    == -1) {
380 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
381 		close(fd);
382 		return err;
383 	}
384 
385 	return flush_imsg(ibuf);
386 }
387 
388 const struct got_error *
389 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
390     struct got_object_id *id, int pack_idx)
391 {
392 	struct ibuf *wbuf;
393 	size_t len;
394 
395 	if (pack_idx != -1)
396 		len = sizeof(struct got_imsg_packed_object);
397 	else
398 		len = sizeof(*id);
399 
400 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
401 	if (wbuf == NULL)
402 		return got_error_from_errno("imsg_create TREE_REQUEST");
403 
404 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
405 		return got_error_from_errno("imsg_add TREE_REQUEST");
406 
407 	if (pack_idx != -1) { /* tree is packed */
408 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
409 			return got_error_from_errno("imsg_add TREE_REQUEST");
410 	}
411 
412 	wbuf->fd = fd;
413 	imsg_close(ibuf, wbuf);
414 
415 	return flush_imsg(ibuf);
416 }
417 
418 const struct got_error *
419 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
420     struct got_object_id *id, int pack_idx)
421 {
422 	struct got_imsg_packed_object iobj;
423 	void *data;
424 	size_t len;
425 
426 	memset(&iobj, 0, sizeof(iobj));
427 	if (pack_idx != -1) { /* tag is packed */
428 		iobj.idx = pack_idx;
429 		memcpy(&iobj.id, id, sizeof(iobj.id));
430 		data = &iobj;
431 		len = sizeof(iobj);
432 	} else {
433 		data = id;
434 		len = sizeof(*id);
435 	}
436 
437 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
438 	    == -1)
439 		return got_error_from_errno("imsg_compose TAG_REQUEST");
440 
441 	return flush_imsg(ibuf);
442 }
443 
444 const struct got_error *
445 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
446     struct got_object_id *id, int pack_idx)
447 {
448 	const struct got_error *err = NULL;
449 	struct got_imsg_packed_object iobj;
450 	void *data;
451 	size_t len;
452 
453 	memset(&iobj, 0, sizeof(iobj));
454 	if (pack_idx != -1) { /* blob is packed */
455 		iobj.idx = pack_idx;
456 		memcpy(&iobj.id, id, sizeof(iobj.id));
457 		data = &iobj;
458 		len = sizeof(iobj);
459 	} else {
460 		data = id;
461 		len = sizeof(*id);
462 	}
463 
464 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
465 	    == -1) {
466 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
467 		close(infd);
468 		return err;
469 	}
470 
471 	return flush_imsg(ibuf);
472 }
473 
474 const struct got_error *
475 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
476 {
477 	const struct got_error *err = NULL;
478 
479 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
480 	    == -1) {
481 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
482 		close(outfd);
483 		return err;
484 	}
485 
486 	return flush_imsg(ibuf);
487 }
488 
489 static const struct got_error *
490 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
491 {
492 	const struct got_error *err = NULL;
493 
494 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
495 		err = got_error_from_errno("imsg_compose TMPFD");
496 		close(fd);
497 		return err;
498 	}
499 
500 	return flush_imsg(ibuf);
501 }
502 
503 const struct got_error *
504 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
505 {
506 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
507 }
508 
509 const struct got_error *
510 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
511 {
512 	struct got_imsg_object iobj;
513 
514 	memset(&iobj, 0, sizeof(iobj));
515 
516 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
517 	iobj.type = obj->type;
518 	iobj.flags = obj->flags;
519 	iobj.hdrlen = obj->hdrlen;
520 	iobj.size = obj->size;
521 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
522 		iobj.pack_offset = obj->pack_offset;
523 		iobj.pack_idx = obj->pack_idx;
524 	}
525 
526 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
527 	    == -1)
528 		return got_error_from_errno("imsg_compose OBJECT");
529 
530 	return flush_imsg(ibuf);
531 }
532 
533 const struct got_error *
534 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
535     struct got_pathlist_head *have_refs, int fetch_all_branches,
536     struct got_pathlist_head *wanted_branches,
537     struct got_pathlist_head *wanted_refs, int list_refs_only,
538     const char *worktree_branch, const char *remote_head,
539     int no_head, int verbosity)
540 {
541 	const struct got_error *err = NULL;
542 	struct ibuf *wbuf;
543 	struct got_pathlist_entry *pe;
544 	struct got_imsg_fetch_request fetchreq;
545 	size_t remote_head_len, worktree_branch_len, len = sizeof(fetchreq);
546 
547 	if (worktree_branch) {
548 		worktree_branch_len = strlen(worktree_branch);
549 		len += worktree_branch_len;
550 	}
551 	if (remote_head) {
552 		remote_head_len = strlen(remote_head);
553 		len += remote_head_len;
554 	}
555 
556 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
557 		close(fd);
558 		return got_error(GOT_ERR_NO_SPACE);
559 	}
560 
561 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
562 	if (wbuf == NULL)
563 		return got_error_from_errno("imsg_create FETCH_HAVE_REF");
564 
565 	memset(&fetchreq, 0, sizeof(fetchreq));
566 	fetchreq.no_head = no_head;
567 	fetchreq.fetch_all_branches = fetch_all_branches;
568 	fetchreq.list_refs_only = list_refs_only;
569 	fetchreq.verbosity = verbosity;
570 	if (worktree_branch != NULL)
571 		fetchreq.worktree_branch_len = worktree_branch_len;
572 	if (remote_head != NULL)
573 		fetchreq.remote_head_len = remote_head_len;
574 	TAILQ_FOREACH(pe, have_refs, entry)
575 		fetchreq.n_have_refs++;
576 	TAILQ_FOREACH(pe, wanted_branches, entry)
577 		fetchreq.n_wanted_branches++;
578 	TAILQ_FOREACH(pe, wanted_refs, entry)
579 		fetchreq.n_wanted_refs++;
580 	if (imsg_add(wbuf, &fetchreq, sizeof(fetchreq)) == -1)
581 		return got_error_from_errno("imsg_add FETCH_REQUEST");
582 	if (worktree_branch) {
583 		if (imsg_add(wbuf, worktree_branch, worktree_branch_len) == -1)
584 			return got_error_from_errno("imsg_add FETCH_REQUEST");
585 	}
586 	if (remote_head) {
587 		if (imsg_add(wbuf, remote_head, remote_head_len) == -1)
588 			return got_error_from_errno("imsg_add FETCH_REQUEST");
589 	}
590 	wbuf->fd = fd;
591 	imsg_close(ibuf, wbuf);
592 
593 	err = flush_imsg(ibuf);
594 	if (err) {
595 		close(fd);
596 		return err;
597 	}
598 	fd = -1;
599 
600 	TAILQ_FOREACH(pe, have_refs, entry) {
601 		const char *name = pe->path;
602 		size_t name_len = pe->path_len;
603 		struct got_object_id *id = pe->data;
604 
605 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
606 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
607 		if (wbuf == NULL)
608 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
609 
610 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
611 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
612 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
613 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
614 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
615 		if (imsg_add(wbuf, name, name_len) == -1)
616 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
617 
618 		wbuf->fd = -1;
619 		imsg_close(ibuf, wbuf);
620 		err = flush_imsg(ibuf);
621 		if (err)
622 			return err;
623 	}
624 
625 	TAILQ_FOREACH(pe, wanted_branches, entry) {
626 		const char *name = pe->path;
627 		size_t name_len = pe->path_len;
628 
629 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
630 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
631 		    len);
632 		if (wbuf == NULL)
633 			return got_error_from_errno(
634 			    "imsg_create FETCH_WANTED_BRANCH");
635 
636 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
637 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
638 			return got_error_from_errno(
639 			    "imsg_add FETCH_WANTED_BRANCH");
640 		if (imsg_add(wbuf, name, name_len) == -1)
641 			return got_error_from_errno(
642 			    "imsg_add FETCH_WANTED_BRANCH");
643 
644 		wbuf->fd = -1;
645 		imsg_close(ibuf, wbuf);
646 		err = flush_imsg(ibuf);
647 		if (err)
648 			return err;
649 	}
650 
651 	TAILQ_FOREACH(pe, wanted_refs, entry) {
652 		const char *name = pe->path;
653 		size_t name_len = pe->path_len;
654 
655 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
656 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
657 		    len);
658 		if (wbuf == NULL)
659 			return got_error_from_errno(
660 			    "imsg_create FETCH_WANTED_REF");
661 
662 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
663 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
664 			return got_error_from_errno(
665 			    "imsg_add FETCH_WANTED_REF");
666 		if (imsg_add(wbuf, name, name_len) == -1)
667 			return got_error_from_errno(
668 			    "imsg_add FETCH_WANTED_REF");
669 
670 		wbuf->fd = -1;
671 		imsg_close(ibuf, wbuf);
672 		err = flush_imsg(ibuf);
673 		if (err)
674 			return err;
675 	}
676 
677 
678 	return NULL;
679 
680 }
681 
682 const struct got_error *
683 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
684 {
685 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
686 }
687 
688 const struct got_error *
689 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
690     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
691     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
692 {
693 	const struct got_error *err = NULL;
694 	struct imsg imsg;
695 	size_t datalen;
696 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
697 	size_t n, remain;
698 	off_t off;
699 	int i;
700 
701 	*done = 0;
702 	*id = NULL;
703 	*refname = NULL;
704 	*server_progress = NULL;
705 	*packfile_size = 0;
706 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
707 
708 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
709 	if (err)
710 		return err;
711 
712 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
713 	switch (imsg.hdr.type) {
714 	case GOT_IMSG_FETCH_SYMREFS:
715 		if (datalen < sizeof(*isymrefs)) {
716 			err = got_error(GOT_ERR_PRIVSEP_LEN);
717 			break;
718 		}
719 		if (isymrefs != NULL) {
720 			err = got_error(GOT_ERR_PRIVSEP_MSG);
721 			break;
722 		}
723 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
724 		off = sizeof(*isymrefs);
725 		remain = datalen - off;
726 		for (n = 0; n < isymrefs->nsymrefs; n++) {
727 			struct got_imsg_fetch_symref *s;
728 			char *name, *target;
729 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
730 				err = got_error(GOT_ERR_PRIVSEP_LEN);
731 				goto done;
732 			}
733 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
734 			off += sizeof(*s);
735 			remain -= sizeof(*s);
736 			if (remain < s->name_len) {
737 				err = got_error(GOT_ERR_PRIVSEP_LEN);
738 				goto done;
739 			}
740 			name = strndup(imsg.data + off, s->name_len);
741 			if (name == NULL) {
742 				err = got_error_from_errno("strndup");
743 				goto done;
744 			}
745 			off += s->name_len;
746 			remain -= s->name_len;
747 			if (remain < s->target_len) {
748 				err = got_error(GOT_ERR_PRIVSEP_LEN);
749 				free(name);
750 				goto done;
751 			}
752 			target = strndup(imsg.data + off, s->target_len);
753 			if (target == NULL) {
754 				err = got_error_from_errno("strndup");
755 				free(name);
756 				goto done;
757 			}
758 			off += s->target_len;
759 			remain -= s->target_len;
760 			err = got_pathlist_append(symrefs, name, target);
761 			if (err) {
762 				free(name);
763 				free(target);
764 				goto done;
765 			}
766 		}
767 		break;
768 	case GOT_IMSG_FETCH_REF:
769 		if (datalen <= sizeof(**id)) {
770 			err = got_error(GOT_ERR_PRIVSEP_MSG);
771 			break;
772 		}
773 		*id = malloc(sizeof(**id));
774 		if (*id == NULL) {
775 			err = got_error_from_errno("malloc");
776 			break;
777 		}
778 		memcpy(*id, imsg.data, sizeof(**id));
779 		*refname = strndup(imsg.data + sizeof(**id),
780 		    datalen - sizeof(**id));
781 		if (*refname == NULL) {
782 			err = got_error_from_errno("strndup");
783 			break;
784 		}
785 		break;
786 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
787 		if (datalen == 0) {
788 			err = got_error(GOT_ERR_PRIVSEP_LEN);
789 			break;
790 		}
791 		*server_progress = strndup(imsg.data, datalen);
792 		if (*server_progress == NULL) {
793 			err = got_error_from_errno("strndup");
794 			break;
795 		}
796 		for (i = 0; i < datalen; i++) {
797 			if (!isprint((unsigned char)(*server_progress)[i]) &&
798 			    !isspace((unsigned char)(*server_progress)[i])) {
799 				err = got_error(GOT_ERR_PRIVSEP_MSG);
800 				free(*server_progress);
801 				*server_progress = NULL;
802 				goto done;
803 			}
804 		}
805 		break;
806 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
807 		if (datalen < sizeof(*packfile_size)) {
808 			err = got_error(GOT_ERR_PRIVSEP_MSG);
809 			break;
810 		}
811 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
812 		break;
813 	case GOT_IMSG_FETCH_DONE:
814 		if (datalen != SHA1_DIGEST_LENGTH) {
815 			err = got_error(GOT_ERR_PRIVSEP_MSG);
816 			break;
817 		}
818 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
819 		*done = 1;
820 		break;
821 	default:
822 		err = got_error(GOT_ERR_PRIVSEP_MSG);
823 		break;
824 	}
825 done:
826 	if (err) {
827 		free(*id);
828 		*id = NULL;
829 		free(*refname);
830 		*refname = NULL;
831 	}
832 	imsg_free(&imsg);
833 	return err;
834 }
835 
836 static const struct got_error *
837 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
838     int delete, struct imsgbuf *ibuf)
839 {
840 	size_t len;
841 	struct ibuf *wbuf;
842 
843 	len = sizeof(struct got_imsg_send_ref) + name_len;
844 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
845 	if (wbuf == NULL)
846 		return got_error_from_errno("imsg_create SEND_REF");
847 
848 	/* Keep in sync with struct got_imsg_send_ref! */
849 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
850 		return got_error_from_errno("imsg_add SEND_REF");
851 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
852 		return got_error_from_errno("imsg_add SEND_REF");
853 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
854 		return got_error_from_errno("imsg_add SEND_REF");
855 	if (imsg_add(wbuf, name, name_len) == -1)
856 		return got_error_from_errno("imsg_add SEND_REF");
857 
858 	wbuf->fd = -1;
859 	imsg_close(ibuf, wbuf);
860 	return flush_imsg(ibuf);
861 }
862 
863 const struct got_error *
864 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
865     struct got_pathlist_head *have_refs,
866     struct got_pathlist_head *delete_refs,
867     int verbosity)
868 {
869 	const struct got_error *err = NULL;
870 	struct got_pathlist_entry *pe;
871 	struct got_imsg_send_request sendreq;
872 	struct got_object_id zero_id;
873 
874 	memset(&zero_id, 0, sizeof(zero_id));
875 	memset(&sendreq, 0, sizeof(sendreq));
876 	sendreq.verbosity = verbosity;
877 	TAILQ_FOREACH(pe, have_refs, entry)
878 		sendreq.nrefs++;
879 	TAILQ_FOREACH(pe, delete_refs, entry)
880 		sendreq.nrefs++;
881 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
882 	    &sendreq, sizeof(sendreq)) == -1) {
883 		err = got_error_from_errno(
884 		    "imsg_compose FETCH_SERVER_PROGRESS");
885 		goto done;
886 	}
887 
888 	err = flush_imsg(ibuf);
889 	if (err)
890 		goto done;
891 	fd = -1;
892 
893 	TAILQ_FOREACH(pe, have_refs, entry) {
894 		const char *name = pe->path;
895 		size_t name_len = pe->path_len;
896 		struct got_object_id *id = pe->data;
897 		err = send_send_ref(name, name_len, id, 0, ibuf);
898 		if (err)
899 			goto done;
900 	}
901 
902 	TAILQ_FOREACH(pe, delete_refs, entry) {
903 		const char *name = pe->path;
904 		size_t name_len = pe->path_len;
905 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
906 		if (err)
907 			goto done;
908 	}
909 done:
910 	if (fd != -1 && close(fd) == -1 && err == NULL)
911 		err = got_error_from_errno("close");
912 	return err;
913 
914 }
915 
916 const struct got_error *
917 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
918     struct imsgbuf *ibuf)
919 {
920 	const struct got_error *err = NULL;
921 	struct imsg imsg;
922 	size_t datalen;
923 	int done = 0;
924 	struct got_imsg_send_remote_ref iremote_ref;
925 	struct got_object_id *id = NULL;
926 	char *refname = NULL;
927 	struct got_pathlist_entry *new;
928 
929 	while (!done) {
930 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
931 		if (err)
932 			return err;
933 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
934 		switch (imsg.hdr.type) {
935 		case GOT_IMSG_SEND_REMOTE_REF:
936 			if (datalen < sizeof(iremote_ref)) {
937 				err = got_error(GOT_ERR_PRIVSEP_MSG);
938 				goto done;
939 			}
940 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
941 			if (datalen != sizeof(iremote_ref) +
942 			    iremote_ref.name_len) {
943 				err = got_error(GOT_ERR_PRIVSEP_MSG);
944 				goto done;
945 			}
946 			id = malloc(sizeof(*id));
947 			if (id == NULL) {
948 				err = got_error_from_errno("malloc");
949 				goto done;
950 			}
951 			memcpy(id, &iremote_ref.id, sizeof(*id));
952 			refname = strndup(imsg.data + sizeof(iremote_ref),
953 			    datalen - sizeof(iremote_ref));
954 			if (refname == NULL) {
955 				err = got_error_from_errno("strndup");
956 				goto done;
957 			}
958 			err = got_pathlist_insert(&new, remote_refs,
959 			    refname, id);
960 			if (err)
961 				goto done;
962 			if (new == NULL) { /* duplicate which wasn't inserted */
963 				free(id);
964 				free(refname);
965 			}
966 			id = NULL;
967 			refname = NULL;
968 			break;
969 		case GOT_IMSG_SEND_PACK_REQUEST:
970 			if (datalen != 0) {
971 				err = got_error(GOT_ERR_PRIVSEP_MSG);
972 				goto done;
973 			}
974 			/* got-send-pack is now waiting for a pack file. */
975 			done = 1;
976 			break;
977 		default:
978 			err = got_error(GOT_ERR_PRIVSEP_MSG);
979 			break;
980 		}
981 	}
982 done:
983 	free(id);
984 	free(refname);
985 	imsg_free(&imsg);
986 	return err;
987 }
988 
989 const struct got_error *
990 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
991 {
992 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
993 }
994 
995 const struct got_error *
996 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
997     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
998 {
999 	const struct got_error *err = NULL;
1000 	struct imsg imsg;
1001 	size_t datalen;
1002 	struct got_imsg_send_ref_status iref_status;
1003 
1004 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1005 	*done = 0;
1006 	*success = 0;
1007 	*refname = NULL;
1008 	*errmsg = NULL;
1009 
1010 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1011 	if (err)
1012 		return err;
1013 
1014 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1015 	switch (imsg.hdr.type) {
1016 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1017 		if (datalen < sizeof(*bytes_sent)) {
1018 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1019 			break;
1020 		}
1021 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1022 		break;
1023 	case GOT_IMSG_SEND_REF_STATUS:
1024 		if (datalen < sizeof(iref_status)) {
1025 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1026 			break;
1027 		}
1028 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1029 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1030 		    iref_status.errmsg_len) {
1031 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1032 			break;
1033 		}
1034 		*success = iref_status.success;
1035 		*refname = strndup(imsg.data + sizeof(iref_status),
1036 		    iref_status.name_len);
1037 
1038 		if (iref_status.errmsg_len != 0)
1039 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1040 			    iref_status.name_len, iref_status.errmsg_len);
1041 		break;
1042 	case GOT_IMSG_SEND_DONE:
1043 		if (datalen != 0) {
1044 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1045 			break;
1046 		}
1047 		*done = 1;
1048 		break;
1049 	default:
1050 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1051 		break;
1052 	}
1053 
1054 	imsg_free(&imsg);
1055 	return err;
1056 }
1057 
1058 const struct got_error *
1059 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1060     int fd)
1061 {
1062 	const struct got_error *err = NULL;
1063 
1064 	/* Keep in sync with struct got_imsg_index_pack_request */
1065 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1066 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1067 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1068 		close(fd);
1069 		return err;
1070 	}
1071 	return flush_imsg(ibuf);
1072 }
1073 
1074 const struct got_error *
1075 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1076 {
1077 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1078 }
1079 
1080 const struct got_error *
1081 got_privsep_recv_index_progress(int *done, int *nobj_total,
1082     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1083     struct imsgbuf *ibuf)
1084 {
1085 	const struct got_error *err = NULL;
1086 	struct imsg imsg;
1087 	struct got_imsg_index_pack_progress *iprogress;
1088 	size_t datalen;
1089 
1090 	*done = 0;
1091 	*nobj_total = 0;
1092 	*nobj_indexed = 0;
1093 	*nobj_resolved = 0;
1094 
1095 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1096 	if (err)
1097 		return err;
1098 
1099 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1100 	switch (imsg.hdr.type) {
1101 	case GOT_IMSG_IDXPACK_PROGRESS:
1102 		if (datalen < sizeof(*iprogress)) {
1103 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1104 			break;
1105 		}
1106 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1107 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1108 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1109 			err = got_error(GOT_ERR_RANGE);
1110 			break;
1111 		}
1112 		*nobj_total = iprogress->nobj_total;
1113 		*nobj_indexed = iprogress->nobj_indexed;
1114 		*nobj_loose = iprogress->nobj_loose;
1115 		*nobj_resolved = iprogress->nobj_resolved;
1116 		break;
1117 	case GOT_IMSG_IDXPACK_DONE:
1118 		if (datalen != 0) {
1119 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1120 			break;
1121 		}
1122 		*done = 1;
1123 		break;
1124 	default:
1125 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1126 		break;
1127 	}
1128 
1129 	imsg_free(&imsg);
1130 	return err;
1131 }
1132 
1133 const struct got_error *
1134 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1135     struct imsgbuf *ibuf)
1136 {
1137 	struct got_imsg_object *iobj;
1138 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1139 
1140 	if (datalen != sizeof(*iobj))
1141 		return got_error(GOT_ERR_PRIVSEP_LEN);
1142 	iobj = imsg->data;
1143 
1144 	if (iobj->pack_offset < 0)
1145 		return got_error(GOT_ERR_PACK_OFFSET);
1146 
1147 	*obj = calloc(1, sizeof(**obj));
1148 	if (*obj == NULL)
1149 		return got_error_from_errno("calloc");
1150 
1151 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1152 	(*obj)->type = iobj->type;
1153 	(*obj)->flags = iobj->flags;
1154 	(*obj)->hdrlen = iobj->hdrlen;
1155 	(*obj)->size = iobj->size;
1156 	/* path_packfile is handled by caller */
1157 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1158 		(*obj)->pack_offset = iobj->pack_offset;
1159 		(*obj)->pack_idx = iobj->pack_idx;
1160 	}
1161 	STAILQ_INIT(&(*obj)->deltas.entries);
1162 	return NULL;
1163 }
1164 
1165 const struct got_error *
1166 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1167 {
1168 	const struct got_error *err = NULL;
1169 	struct imsg imsg;
1170 	const size_t min_datalen =
1171 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1172 
1173 	*obj = NULL;
1174 
1175 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1176 	if (err)
1177 		return err;
1178 
1179 	switch (imsg.hdr.type) {
1180 	case GOT_IMSG_OBJECT:
1181 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1182 		break;
1183 	default:
1184 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1185 		break;
1186 	}
1187 
1188 	imsg_free(&imsg);
1189 
1190 	return err;
1191 }
1192 
1193 static const struct got_error *
1194 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1195     size_t logmsg_len)
1196 {
1197 	const struct got_error *err = NULL;
1198 	size_t offset, remain;
1199 
1200 	offset = 0;
1201 	remain = logmsg_len;
1202 	while (remain > 0) {
1203 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1204 
1205 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1206 		    commit->logmsg + offset, n) == -1) {
1207 			err = got_error_from_errno("imsg_compose "
1208 			    "COMMIT_LOGMSG");
1209 			break;
1210 		}
1211 
1212 		err = flush_imsg(ibuf);
1213 		if (err)
1214 			break;
1215 
1216 		offset += n;
1217 		remain -= n;
1218 	}
1219 
1220 	return err;
1221 }
1222 
1223 const struct got_error *
1224 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1225 {
1226 	const struct got_error *err = NULL;
1227 	struct got_imsg_commit_object *icommit;
1228 	uint8_t *buf;
1229 	size_t len, total;
1230 	struct got_object_qid *qid;
1231 	size_t author_len = strlen(commit->author);
1232 	size_t committer_len = strlen(commit->committer);
1233 	size_t logmsg_len = strlen(commit->logmsg);
1234 
1235 	total = sizeof(*icommit) + author_len + committer_len +
1236 	    commit->nparents * sizeof(struct got_object_id);
1237 
1238 	buf = malloc(total);
1239 	if (buf == NULL)
1240 		return got_error_from_errno("malloc");
1241 
1242 	icommit = (struct got_imsg_commit_object *)buf;
1243 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1244 	icommit->author_len = author_len;
1245 	icommit->author_time = commit->author_time;
1246 	icommit->author_gmtoff = commit->author_gmtoff;
1247 	icommit->committer_len = committer_len;
1248 	icommit->committer_time = commit->committer_time;
1249 	icommit->committer_gmtoff = commit->committer_gmtoff;
1250 	icommit->logmsg_len = logmsg_len;
1251 	icommit->nparents = commit->nparents;
1252 
1253 	len = sizeof(*icommit);
1254 	memcpy(buf + len, commit->author, author_len);
1255 	len += author_len;
1256 	memcpy(buf + len, commit->committer, committer_len);
1257 	len += committer_len;
1258 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1259 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1260 		len += sizeof(qid->id);
1261 	}
1262 
1263 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1264 		err = got_error_from_errno("imsg_compose COMMIT");
1265 		goto done;
1266 	}
1267 
1268 	if (logmsg_len == 0 ||
1269 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1270 		err = flush_imsg(ibuf);
1271 		if (err)
1272 			goto done;
1273 	}
1274 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1275 done:
1276 	free(buf);
1277 	return err;
1278 }
1279 
1280 static const struct got_error *
1281 get_commit_from_imsg(struct got_commit_object **commit,
1282     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1283 {
1284 	const struct got_error *err = NULL;
1285 	struct got_imsg_commit_object *icommit;
1286 	size_t len = 0;
1287 	int i;
1288 
1289 	if (datalen < sizeof(*icommit))
1290 		return got_error(GOT_ERR_PRIVSEP_LEN);
1291 
1292 	icommit = imsg->data;
1293 	if (datalen != sizeof(*icommit) + icommit->author_len +
1294 	    icommit->committer_len +
1295 	    icommit->nparents * sizeof(struct got_object_id))
1296 		return got_error(GOT_ERR_PRIVSEP_LEN);
1297 
1298 	if (icommit->nparents < 0)
1299 		return got_error(GOT_ERR_PRIVSEP_LEN);
1300 
1301 	len += sizeof(*icommit);
1302 
1303 	*commit = got_object_commit_alloc_partial();
1304 	if (*commit == NULL)
1305 		return got_error_from_errno(
1306 		    "got_object_commit_alloc_partial");
1307 
1308 	memcpy((*commit)->tree_id, &icommit->tree_id,
1309 	    sizeof(icommit->tree_id));
1310 	(*commit)->author_time = icommit->author_time;
1311 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1312 	(*commit)->committer_time = icommit->committer_time;
1313 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1314 
1315 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1316 	if ((*commit)->author == NULL) {
1317 		err = got_error_from_errno("strndup");
1318 		goto done;
1319 	}
1320 	len += icommit->author_len;
1321 
1322 	(*commit)->committer = strndup(imsg->data + len,
1323 	    icommit->committer_len);
1324 	if ((*commit)->committer == NULL) {
1325 		err = got_error_from_errno("strndup");
1326 		goto done;
1327 	}
1328 	len += icommit->committer_len;
1329 
1330 	if (icommit->logmsg_len == 0) {
1331 		(*commit)->logmsg = strdup("");
1332 		if ((*commit)->logmsg == NULL) {
1333 			err = got_error_from_errno("strdup");
1334 			goto done;
1335 		}
1336 	} else {
1337 		size_t offset = 0, remain = icommit->logmsg_len;
1338 
1339 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1340 		if ((*commit)->logmsg == NULL) {
1341 			err = got_error_from_errno("malloc");
1342 			goto done;
1343 		}
1344 		while (remain > 0) {
1345 			struct imsg imsg_log;
1346 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1347 			    remain);
1348 
1349 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1350 			if (err)
1351 				goto done;
1352 
1353 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1354 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1355 				goto done;
1356 			}
1357 
1358 			memcpy((*commit)->logmsg + offset,
1359 			    imsg_log.data, n);
1360 			imsg_free(&imsg_log);
1361 			offset += n;
1362 			remain -= n;
1363 		}
1364 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1365 	}
1366 
1367 	for (i = 0; i < icommit->nparents; i++) {
1368 		struct got_object_qid *qid;
1369 
1370 		err = got_object_qid_alloc_partial(&qid);
1371 		if (err)
1372 			break;
1373 		memcpy(&qid->id, imsg->data + len +
1374 		    i * sizeof(qid->id), sizeof(qid->id));
1375 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1376 		(*commit)->nparents++;
1377 	}
1378 done:
1379 	if (err) {
1380 		got_object_commit_close(*commit);
1381 		*commit = NULL;
1382 	}
1383 	return err;
1384 }
1385 
1386 const struct got_error *
1387 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1388 {
1389 	const struct got_error *err = NULL;
1390 	struct imsg imsg;
1391 	size_t datalen;
1392 	const size_t min_datalen =
1393 	    MIN(sizeof(struct got_imsg_error),
1394 	    sizeof(struct got_imsg_commit_object));
1395 
1396 	*commit = NULL;
1397 
1398 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1399 	if (err)
1400 		return err;
1401 
1402 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1403 
1404 	switch (imsg.hdr.type) {
1405 	case GOT_IMSG_COMMIT:
1406 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1407 		break;
1408 	default:
1409 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1410 		break;
1411 	}
1412 
1413 	imsg_free(&imsg);
1414 
1415 	return err;
1416 }
1417 
1418 static const struct got_error *
1419 send_tree_entries_batch(struct imsgbuf *ibuf,
1420     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1421 {
1422 	struct ibuf *wbuf;
1423 	struct got_imsg_tree_entries ientries;
1424 	int i;
1425 
1426 	memset(&ientries, 0, sizeof(ientries));
1427 
1428 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1429 	if (wbuf == NULL)
1430 		return got_error_from_errno("imsg_create TREE_ENTRY");
1431 
1432 	ientries.nentries = idxN - idx0 + 1;
1433 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1434 		return got_error_from_errno("imsg_add TREE_ENTRY");
1435 
1436 	for (i = idx0; i <= idxN; i++) {
1437 		struct got_parsed_tree_entry *pte = &entries[i];
1438 
1439 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1440 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1441 			return got_error_from_errno("imsg_add TREE_ENTRY");
1442 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1443 			return got_error_from_errno("imsg_add TREE_ENTRY");
1444 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1445 			return got_error_from_errno("imsg_add TREE_ENTRY");
1446 
1447 		/* Remaining bytes are the entry's name. */
1448 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1449 			return got_error_from_errno("imsg_add TREE_ENTRY");
1450 	}
1451 
1452 	wbuf->fd = -1;
1453 	imsg_close(ibuf, wbuf);
1454 	return NULL;
1455 }
1456 
1457 static const struct got_error *
1458 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1459     int nentries)
1460 {
1461 	const struct got_error *err = NULL;
1462 	int i, j;
1463 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1464 
1465 	i = 0;
1466 	for (j = 0; j < nentries; j++) {
1467 		struct got_parsed_tree_entry *pte = &entries[j];
1468 		size_t len = sizeof(struct got_imsg_tree_entry) + pte->namelen;
1469 
1470 		if (j > 0 &&
1471 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1472 			err = send_tree_entries_batch(ibuf, entries,
1473 			    i, j - 1, entries_len);
1474 			if (err)
1475 				return err;
1476 			i = j;
1477 			entries_len = sizeof(struct got_imsg_tree_entries);
1478 		}
1479 
1480 		entries_len += len;
1481 	}
1482 
1483 	if (j > 0) {
1484 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1485 		    entries_len);
1486 		if (err)
1487 			return err;
1488 	}
1489 
1490 	return NULL;
1491 }
1492 
1493 const struct got_error *
1494 got_privsep_send_tree(struct imsgbuf *ibuf,
1495     struct got_parsed_tree_entry *entries, int nentries)
1496 {
1497 	const struct got_error *err = NULL;
1498 	struct got_imsg_tree_object itree;
1499 
1500 	memset(&itree, 0, sizeof(itree));
1501 	itree.nentries = nentries;
1502 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1503 	    == -1)
1504 		return got_error_from_errno("imsg_compose TREE");
1505 
1506 	err = send_tree_entries(ibuf, entries, nentries);
1507 	if (err)
1508 		return err;
1509 
1510 	return flush_imsg(ibuf);
1511 }
1512 
1513 
1514 static const struct got_error *
1515 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1516     int *nentries)
1517 {
1518 	const struct got_error *err = NULL;
1519 	struct got_imsg_tree_entries *ientries;
1520 	struct got_tree_entry *te;
1521 	size_t te_offset;
1522 	size_t i;
1523 
1524 	if (datalen <= sizeof(*ientries) ||
1525 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1526 		return got_error(GOT_ERR_PRIVSEP_LEN);
1527 
1528 	ientries = (struct got_imsg_tree_entries *)data;
1529 	if (ientries->nentries > INT_MAX) {
1530 		return got_error_msg(GOT_ERR_NO_SPACE,
1531 		    "too many tree entries");
1532 	}
1533 
1534 	te_offset = sizeof(*ientries);
1535 	for (i = 0; i < ientries->nentries; i++) {
1536 		struct got_imsg_tree_entry ite;
1537 		const char *te_name;
1538 		uint8_t *buf = (uint8_t *)data + te_offset;
1539 
1540 		if (te_offset >= datalen) {
1541 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1542 			break;
1543 		}
1544 
1545 		/* Might not be aligned, size is ~32 bytes. */
1546 		memcpy(&ite, buf, sizeof(ite));
1547 
1548 		if (ite.namelen >= sizeof(te->name)) {
1549 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1550 			break;
1551 		}
1552 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1553 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1554 			break;
1555 		}
1556 
1557 		if (*nentries >= tree->nentries) {
1558 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1559 			break;
1560 		}
1561 		te = &tree->entries[*nentries];
1562 		te_name = buf + sizeof(ite);
1563 		memcpy(te->name, te_name, ite.namelen);
1564 		te->name[ite.namelen] = '\0';
1565 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1566 		te->mode = ite.mode;
1567 		te->idx = *nentries;
1568 		(*nentries)++;
1569 
1570 		te_offset += sizeof(ite) + ite.namelen;
1571 	}
1572 
1573 	return err;
1574 }
1575 
1576 const struct got_error *
1577 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1578 {
1579 	const struct got_error *err = NULL;
1580 	const size_t min_datalen =
1581 	    MIN(sizeof(struct got_imsg_error),
1582 	    sizeof(struct got_imsg_tree_object));
1583 	struct got_imsg_tree_object *itree;
1584 	int nentries = 0;
1585 
1586 	*tree = NULL;
1587 
1588 	while (*tree == NULL || nentries < (*tree)->nentries) {
1589 		struct imsg imsg;
1590 		size_t datalen;
1591 
1592 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1593 		if (err)
1594 			break;
1595 
1596 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1597 
1598 		switch (imsg.hdr.type) {
1599 		case GOT_IMSG_TREE:
1600 			/* This message should only appear once. */
1601 			if (*tree != NULL) {
1602 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1603 				break;
1604 			}
1605 			if (datalen != sizeof(*itree)) {
1606 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1607 				break;
1608 			}
1609 			itree = imsg.data;
1610 			if (itree->nentries < 0) {
1611 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1612 				break;
1613 			}
1614 			*tree = malloc(sizeof(**tree));
1615 			if (*tree == NULL) {
1616 				err = got_error_from_errno("malloc");
1617 				break;
1618 			}
1619 			(*tree)->entries = calloc(itree->nentries,
1620 			    sizeof(struct got_tree_entry));
1621 			if ((*tree)->entries == NULL) {
1622 				err = got_error_from_errno("malloc");
1623 				free(*tree);
1624 				*tree = NULL;
1625 				break;
1626 			}
1627 			(*tree)->nentries = itree->nentries;
1628 			(*tree)->refcnt = 0;
1629 			break;
1630 		case GOT_IMSG_TREE_ENTRIES:
1631 			/* This message should be preceeded by GOT_IMSG_TREE. */
1632 			if (*tree == NULL) {
1633 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1634 				break;
1635 			}
1636 			err = recv_tree_entries(imsg.data, datalen,
1637 			    *tree, &nentries);
1638 			break;
1639 		default:
1640 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1641 			break;
1642 		}
1643 
1644 		imsg_free(&imsg);
1645 		if (err)
1646 			break;
1647 	}
1648 
1649 	if (*tree && (*tree)->nentries != nentries) {
1650 		if (err == NULL)
1651 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1652 		got_object_tree_close(*tree);
1653 		*tree = NULL;
1654 	}
1655 
1656 	return err;
1657 }
1658 
1659 const struct got_error *
1660 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1661     const uint8_t *data)
1662 {
1663 	struct got_imsg_blob iblob;
1664 
1665 	memset(&iblob, 0, sizeof(iblob));
1666 	iblob.size = size;
1667 	iblob.hdrlen = hdrlen;
1668 
1669 	if (data) {
1670 		uint8_t *buf;
1671 
1672 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1673 			return got_error(GOT_ERR_NO_SPACE);
1674 
1675 		buf = malloc(sizeof(iblob) + size);
1676 		if (buf == NULL)
1677 			return got_error_from_errno("malloc");
1678 
1679 		memcpy(buf, &iblob, sizeof(iblob));
1680 		memcpy(buf + sizeof(iblob), data, size);
1681 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1682 		    sizeof(iblob) + size) == -1) {
1683 			free(buf);
1684 			return got_error_from_errno("imsg_compose BLOB");
1685 		}
1686 		free(buf);
1687 	} else {
1688 		/* Data has already been written to file descriptor. */
1689 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1690 		    sizeof(iblob)) == -1)
1691 			return got_error_from_errno("imsg_compose BLOB");
1692 	}
1693 
1694 
1695 	return flush_imsg(ibuf);
1696 }
1697 
1698 const struct got_error *
1699 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1700     struct imsgbuf *ibuf)
1701 {
1702 	const struct got_error *err = NULL;
1703 	struct imsg imsg;
1704 	struct got_imsg_blob *iblob;
1705 	size_t datalen;
1706 
1707 	*outbuf = NULL;
1708 
1709 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1710 	if (err)
1711 		return err;
1712 
1713 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1714 
1715 	switch (imsg.hdr.type) {
1716 	case GOT_IMSG_BLOB:
1717 		if (datalen < sizeof(*iblob)) {
1718 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1719 			break;
1720 		}
1721 		iblob = imsg.data;
1722 		*size = iblob->size;
1723 		*hdrlen = iblob->hdrlen;
1724 
1725 		if (datalen == sizeof(*iblob)) {
1726 			/* Data has been written to file descriptor. */
1727 			break;
1728 		}
1729 
1730 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1731 		    *size > datalen + sizeof(*iblob)) {
1732 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1733 			break;
1734 		}
1735 
1736 		*outbuf = malloc(*size);
1737 		if (*outbuf == NULL) {
1738 			err = got_error_from_errno("malloc");
1739 			break;
1740 		}
1741 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1742 		break;
1743 	default:
1744 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1745 		break;
1746 	}
1747 
1748 	imsg_free(&imsg);
1749 
1750 	return err;
1751 }
1752 
1753 static const struct got_error *
1754 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1755 {
1756 	const struct got_error *err = NULL;
1757 	size_t offset, remain;
1758 
1759 	offset = 0;
1760 	remain = tagmsg_len;
1761 	while (remain > 0) {
1762 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1763 
1764 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1765 		    tag->tagmsg + offset, n) == -1) {
1766 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1767 			break;
1768 		}
1769 
1770 		err = flush_imsg(ibuf);
1771 		if (err)
1772 			break;
1773 
1774 		offset += n;
1775 		remain -= n;
1776 	}
1777 
1778 	return err;
1779 }
1780 
1781 const struct got_error *
1782 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1783 {
1784 	const struct got_error *err = NULL;
1785 	struct got_imsg_tag_object *itag;
1786 	uint8_t *buf;
1787 	size_t len, total;
1788 	size_t tag_len = strlen(tag->tag);
1789 	size_t tagger_len = strlen(tag->tagger);
1790 	size_t tagmsg_len = strlen(tag->tagmsg);
1791 
1792 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1793 
1794 	buf = malloc(total);
1795 	if (buf == NULL)
1796 		return got_error_from_errno("malloc");
1797 
1798 	itag = (struct got_imsg_tag_object *)buf;
1799 	memcpy(&itag->id, &tag->id, sizeof(itag->id));
1800 	itag->obj_type = tag->obj_type;
1801 	itag->tag_len = tag_len;
1802 	itag->tagger_len = tagger_len;
1803 	itag->tagger_time = tag->tagger_time;
1804 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1805 	itag->tagmsg_len = tagmsg_len;
1806 
1807 	len = sizeof(*itag);
1808 	memcpy(buf + len, tag->tag, tag_len);
1809 	len += tag_len;
1810 	memcpy(buf + len, tag->tagger, tagger_len);
1811 	len += tagger_len;
1812 
1813 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1814 		err = got_error_from_errno("imsg_compose TAG");
1815 		goto done;
1816 	}
1817 
1818 	if (tagmsg_len == 0 ||
1819 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1820 		err = flush_imsg(ibuf);
1821 		if (err)
1822 			goto done;
1823 	}
1824 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1825 done:
1826 	free(buf);
1827 	return err;
1828 }
1829 
1830 const struct got_error *
1831 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1832 {
1833 	const struct got_error *err = NULL;
1834 	struct imsg imsg;
1835 	struct got_imsg_tag_object *itag;
1836 	size_t len, datalen;
1837 	const size_t min_datalen =
1838 	    MIN(sizeof(struct got_imsg_error),
1839 	    sizeof(struct got_imsg_tag_object));
1840 
1841 	*tag = NULL;
1842 
1843 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1844 	if (err)
1845 		return err;
1846 
1847 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1848 	len = 0;
1849 
1850 	switch (imsg.hdr.type) {
1851 	case GOT_IMSG_TAG:
1852 		if (datalen < sizeof(*itag)) {
1853 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1854 			break;
1855 		}
1856 		itag = imsg.data;
1857 		if (datalen != sizeof(*itag) + itag->tag_len +
1858 		    itag->tagger_len) {
1859 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1860 			break;
1861 		}
1862 		len += sizeof(*itag);
1863 
1864 		*tag = calloc(1, sizeof(**tag));
1865 		if (*tag == NULL) {
1866 			err = got_error_from_errno("calloc");
1867 			break;
1868 		}
1869 
1870 		memcpy(&(*tag)->id, &itag->id, sizeof(itag->id));
1871 
1872 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1873 		if ((*tag)->tag == NULL) {
1874 			err = got_error_from_errno("strndup");
1875 			break;
1876 		}
1877 		len += itag->tag_len;
1878 
1879 		(*tag)->obj_type = itag->obj_type;
1880 		(*tag)->tagger_time = itag->tagger_time;
1881 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1882 
1883 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1884 		if ((*tag)->tagger == NULL) {
1885 			err = got_error_from_errno("strndup");
1886 			break;
1887 		}
1888 		len += itag->tagger_len;
1889 
1890 		if (itag->tagmsg_len == 0) {
1891 			(*tag)->tagmsg = strdup("");
1892 			if ((*tag)->tagmsg == NULL) {
1893 				err = got_error_from_errno("strdup");
1894 				break;
1895 			}
1896 		} else {
1897 			size_t offset = 0, remain = itag->tagmsg_len;
1898 
1899 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1900 			if ((*tag)->tagmsg == NULL) {
1901 				err = got_error_from_errno("malloc");
1902 				break;
1903 			}
1904 			while (remain > 0) {
1905 				struct imsg imsg_log;
1906 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1907 				    remain);
1908 
1909 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1910 				if (err)
1911 					return err;
1912 
1913 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1914 					return got_error(GOT_ERR_PRIVSEP_MSG);
1915 
1916 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1917 				    n);
1918 				imsg_free(&imsg_log);
1919 				offset += n;
1920 				remain -= n;
1921 			}
1922 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1923 		}
1924 
1925 		break;
1926 	default:
1927 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1928 		break;
1929 	}
1930 
1931 	imsg_free(&imsg);
1932 
1933 	return err;
1934 }
1935 
1936 const struct got_error *
1937 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1938     struct got_packidx *packidx)
1939 {
1940 	const struct got_error *err = NULL;
1941 	struct got_imsg_packidx ipackidx;
1942 	struct got_imsg_pack ipack;
1943 	int fd;
1944 
1945 	memset(&ipackidx, 0, sizeof(ipackidx));
1946 	memset(&ipack, 0, sizeof(ipack));
1947 
1948 	ipackidx.len = packidx->len;
1949 	ipackidx.packfile_size = pack->filesize;
1950 	fd = dup(packidx->fd);
1951 	if (fd == -1)
1952 		return got_error_from_errno("dup");
1953 
1954 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1955 	    sizeof(ipackidx)) == -1) {
1956 		err = got_error_from_errno("imsg_compose PACKIDX");
1957 		close(fd);
1958 		return err;
1959 	}
1960 
1961 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1962 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1963 		return got_error(GOT_ERR_NO_SPACE);
1964 	ipack.filesize = pack->filesize;
1965 
1966 	fd = dup(pack->fd);
1967 	if (fd == -1)
1968 		return got_error_from_errno("dup");
1969 
1970 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1971 	    == -1) {
1972 		err = got_error_from_errno("imsg_compose PACK");
1973 		close(fd);
1974 		return err;
1975 	}
1976 
1977 	return flush_imsg(ibuf);
1978 }
1979 
1980 const struct got_error *
1981 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1982     struct got_object_id *id)
1983 {
1984 	struct got_imsg_packed_object iobj;
1985 
1986 	memset(&iobj, 0, sizeof(iobj));
1987 	iobj.idx = idx;
1988 	memcpy(&iobj.id, id, sizeof(iobj.id));
1989 
1990 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1991 	    &iobj, sizeof(iobj)) == -1)
1992 		return got_error_from_errno("imsg_compose "
1993 		    "PACKED_OBJECT_REQUEST");
1994 
1995 	return flush_imsg(ibuf);
1996 }
1997 
1998 const struct got_error *
1999 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2000     struct got_object_id *id)
2001 {
2002 	struct got_imsg_packed_object iobj;
2003 
2004 	memset(&iobj, 0, sizeof(iobj));
2005 	iobj.idx = idx;
2006 	memcpy(&iobj.id, id, sizeof(iobj.id));
2007 
2008 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2009 	    &iobj, sizeof(iobj)) == -1)
2010 		return got_error_from_errno("imsg_compose "
2011 		    "PACKED_OBJECT_REQUEST");
2012 
2013 	return flush_imsg(ibuf);
2014 }
2015 
2016 const struct got_error *
2017 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2018 {
2019 	const struct got_error *err = NULL;
2020 
2021 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2022 	    NULL, 0) == -1) {
2023 		err = got_error_from_errno("imsg_compose "
2024 		    "GITCONFIG_PARSE_REQUEST");
2025 		close(fd);
2026 		return err;
2027 	}
2028 
2029 	return flush_imsg(ibuf);
2030 }
2031 
2032 const struct got_error *
2033 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2034 {
2035 	if (imsg_compose(ibuf,
2036 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2037 	    NULL, 0) == -1)
2038 		return got_error_from_errno("imsg_compose "
2039 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2040 
2041 	return flush_imsg(ibuf);
2042 }
2043 
2044 const struct got_error *
2045 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2046 {
2047 	if (imsg_compose(ibuf,
2048 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2049 	    NULL, 0) == -1)
2050 		return got_error_from_errno("imsg_compose "
2051 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2052 
2053 	return flush_imsg(ibuf);
2054 }
2055 
2056 
2057 const struct got_error *
2058 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2059 {
2060 	if (imsg_compose(ibuf,
2061 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2062 		return got_error_from_errno("imsg_compose "
2063 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2064 
2065 	return flush_imsg(ibuf);
2066 }
2067 
2068 const struct got_error *
2069 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2070 {
2071 	if (imsg_compose(ibuf,
2072 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2073 		return got_error_from_errno("imsg_compose "
2074 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2075 
2076 	return flush_imsg(ibuf);
2077 }
2078 
2079 const struct got_error *
2080 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2081 {
2082 	if (imsg_compose(ibuf,
2083 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2084 		return got_error_from_errno("imsg_compose "
2085 		    "GITCONFIG_REMOTE_REQUEST");
2086 
2087 	return flush_imsg(ibuf);
2088 }
2089 
2090 const struct got_error *
2091 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2092 {
2093 	if (imsg_compose(ibuf,
2094 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2095 		return got_error_from_errno("imsg_compose "
2096 		    "GITCONFIG_OWNER_REQUEST");
2097 
2098 	return flush_imsg(ibuf);
2099 }
2100 
2101 const struct got_error *
2102 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2103 {
2104 	const struct got_error *err = NULL;
2105 	struct imsg imsg;
2106 	size_t datalen;
2107 
2108 	*str = NULL;
2109 
2110 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2111 	if (err)
2112 		return err;
2113 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2114 
2115 	switch (imsg.hdr.type) {
2116 	case GOT_IMSG_GITCONFIG_STR_VAL:
2117 		if (datalen == 0)
2118 			break;
2119 		*str = strndup(imsg.data, datalen);
2120 		if (*str == NULL) {
2121 			err = got_error_from_errno("strndup");
2122 			break;
2123 		}
2124 		break;
2125 	default:
2126 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2127 		break;
2128 	}
2129 
2130 	imsg_free(&imsg);
2131 	return err;
2132 }
2133 
2134 const struct got_error *
2135 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2136 {
2137 	const struct got_error *err = NULL;
2138 	struct got_imsg_gitconfig_pair p;
2139 	struct imsg imsg;
2140 	size_t datalen;
2141 	uint8_t *data;
2142 
2143 	*key = *val = NULL;
2144 
2145 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2146 	if (err)
2147 		return err;
2148 
2149 	data = imsg.data;
2150 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2151 
2152 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2153 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2154 		goto done;
2155 	}
2156 
2157 	if (datalen < sizeof(p)) {
2158 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2159 		goto done;
2160 	}
2161 
2162 	memcpy(&p, data, sizeof(p));
2163 	data += sizeof(p);
2164 
2165 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2166 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2167 		goto done;
2168 	}
2169 
2170 	*key = strndup(data, p.klen);
2171 	if (*key == NULL) {
2172 		err = got_error_from_errno("strndup");
2173 		goto done;
2174 	}
2175 	data += p.klen;
2176 
2177 	*val = strndup(data, p.vlen);
2178 	if (*val == NULL) {
2179 		err = got_error_from_errno("strndup");
2180 		goto done;
2181 	}
2182 
2183 done:
2184 	imsg_free(&imsg);
2185 	return err;
2186 }
2187 
2188 const struct got_error *
2189 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2190 {
2191 	const struct got_error *err = NULL;
2192 	struct imsg imsg;
2193 	size_t datalen;
2194 	const size_t min_datalen =
2195 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2196 
2197 	*val = 0;
2198 
2199 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2200 	if (err)
2201 		return err;
2202 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2203 
2204 	switch (imsg.hdr.type) {
2205 	case GOT_IMSG_GITCONFIG_INT_VAL:
2206 		if (datalen != sizeof(*val)) {
2207 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2208 			break;
2209 		}
2210 		memcpy(val, imsg.data, sizeof(*val));
2211 		break;
2212 	default:
2213 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2214 		break;
2215 	}
2216 
2217 	imsg_free(&imsg);
2218 	return err;
2219 }
2220 
2221 static void
2222 free_remote_data(struct got_remote_repo *remote)
2223 {
2224 	int i;
2225 
2226 	free(remote->name);
2227 	free(remote->fetch_url);
2228 	free(remote->send_url);
2229 	for (i = 0; i < remote->nfetch_branches; i++)
2230 		free(remote->fetch_branches[i]);
2231 	free(remote->fetch_branches);
2232 	for (i = 0; i < remote->nsend_branches; i++)
2233 		free(remote->send_branches[i]);
2234 	free(remote->send_branches);
2235 	for (i = 0; i < remote->nfetch_refs; i++)
2236 		free(remote->fetch_refs[i]);
2237 	free(remote->fetch_refs);
2238 }
2239 
2240 const struct got_error *
2241 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2242     int *nremotes, struct imsgbuf *ibuf)
2243 {
2244 	const struct got_error *err = NULL;
2245 	struct imsg imsg;
2246 	size_t datalen;
2247 	struct got_imsg_remotes iremotes;
2248 	struct got_imsg_remote iremote;
2249 
2250 	*remotes = NULL;
2251 	*nremotes = 0;
2252 	iremotes.nremotes = 0;
2253 
2254 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2255 	if (err)
2256 		return err;
2257 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2258 
2259 	switch (imsg.hdr.type) {
2260 	case GOT_IMSG_GITCONFIG_REMOTES:
2261 		if (datalen != sizeof(iremotes)) {
2262 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2263 			break;
2264 		}
2265 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2266 		if (iremotes.nremotes == 0) {
2267 			imsg_free(&imsg);
2268 			return NULL;
2269 		}
2270 		break;
2271 	default:
2272 		imsg_free(&imsg);
2273 		return got_error(GOT_ERR_PRIVSEP_MSG);
2274 	}
2275 
2276 	imsg_free(&imsg);
2277 
2278 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2279 	if (*remotes == NULL)
2280 		return got_error_from_errno("recallocarray");
2281 
2282 	while (*nremotes < iremotes.nremotes) {
2283 		struct got_remote_repo *remote;
2284 
2285 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2286 		if (err)
2287 			break;
2288 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2289 
2290 		switch (imsg.hdr.type) {
2291 		case GOT_IMSG_GITCONFIG_REMOTE:
2292 			remote = &(*remotes)[*nremotes];
2293 			memset(remote, 0, sizeof(*remote));
2294 			if (datalen < sizeof(iremote)) {
2295 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2296 				break;
2297 			}
2298 			memcpy(&iremote, imsg.data, sizeof(iremote));
2299 			if (iremote.name_len == 0 ||
2300 			    iremote.fetch_url_len == 0 ||
2301 			    iremote.send_url_len == 0 ||
2302 			    (sizeof(iremote) + iremote.name_len +
2303 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2304 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2305 				break;
2306 			}
2307 			remote->name = strndup(imsg.data + sizeof(iremote),
2308 			    iremote.name_len);
2309 			if (remote->name == NULL) {
2310 				err = got_error_from_errno("strndup");
2311 				break;
2312 			}
2313 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2314 			    iremote.name_len, iremote.fetch_url_len);
2315 			if (remote->fetch_url == NULL) {
2316 				err = got_error_from_errno("strndup");
2317 				free_remote_data(remote);
2318 				break;
2319 			}
2320 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2321 			    iremote.name_len + iremote.fetch_url_len,
2322 			    iremote.send_url_len);
2323 			if (remote->send_url == NULL) {
2324 				err = got_error_from_errno("strndup");
2325 				free_remote_data(remote);
2326 				break;
2327 			}
2328 			remote->mirror_references = iremote.mirror_references;
2329 			remote->fetch_all_branches = iremote.fetch_all_branches;
2330 			remote->nfetch_branches = 0;
2331 			remote->fetch_branches = NULL;
2332 			remote->nsend_branches = 0;
2333 			remote->send_branches = NULL;
2334 			remote->nfetch_refs = 0;
2335 			remote->fetch_refs = NULL;
2336 			(*nremotes)++;
2337 			break;
2338 		default:
2339 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2340 			break;
2341 		}
2342 
2343 		imsg_free(&imsg);
2344 		if (err)
2345 			break;
2346 	}
2347 
2348 	if (err) {
2349 		int i;
2350 		for (i = 0; i < *nremotes; i++)
2351 			free_remote_data(&(*remotes)[i]);
2352 		free(*remotes);
2353 		*remotes = NULL;
2354 		*nremotes = 0;
2355 	}
2356 	return err;
2357 }
2358 
2359 const struct got_error *
2360 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2361 {
2362 	const struct got_error *err = NULL;
2363 
2364 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2365 	    NULL, 0) == -1) {
2366 		err = got_error_from_errno("imsg_compose "
2367 		    "GOTCONFIG_PARSE_REQUEST");
2368 		close(fd);
2369 		return err;
2370 	}
2371 
2372 	return flush_imsg(ibuf);
2373 }
2374 
2375 const struct got_error *
2376 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2377 {
2378 	if (imsg_compose(ibuf,
2379 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2380 		return got_error_from_errno("imsg_compose "
2381 		    "GOTCONFIG_AUTHOR_REQUEST");
2382 
2383 	return flush_imsg(ibuf);
2384 }
2385 
2386 const struct got_error *
2387 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2388 {
2389 	if (imsg_compose(ibuf,
2390 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2391 		return got_error_from_errno("imsg_compose "
2392 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2393 
2394 	return flush_imsg(ibuf);
2395 }
2396 
2397 const struct got_error *
2398 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2399 {
2400 	if (imsg_compose(ibuf,
2401 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2402 		return got_error_from_errno("imsg_compose "
2403 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2404 
2405 	return flush_imsg(ibuf);
2406 }
2407 
2408 const struct got_error *
2409 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2410 {
2411 	if (imsg_compose(ibuf,
2412 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2413 		return got_error_from_errno("imsg_compose "
2414 		    "GOTCONFIG_SIGNERID_REQUEST");
2415 
2416 	return flush_imsg(ibuf);
2417 }
2418 
2419 const struct got_error *
2420 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2421 {
2422 	if (imsg_compose(ibuf,
2423 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2424 		return got_error_from_errno("imsg_compose "
2425 		    "GOTCONFIG_REMOTE_REQUEST");
2426 
2427 	return flush_imsg(ibuf);
2428 }
2429 
2430 const struct got_error *
2431 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2432 {
2433 	const struct got_error *err = NULL;
2434 	struct imsg imsg;
2435 	size_t datalen;
2436 
2437 	*str = NULL;
2438 
2439 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2440 	if (err)
2441 		return err;
2442 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2443 
2444 	switch (imsg.hdr.type) {
2445 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2446 		if (datalen == 0)
2447 			break;
2448 		*str = strndup(imsg.data, datalen);
2449 		if (*str == NULL) {
2450 			err = got_error_from_errno("strndup");
2451 			break;
2452 		}
2453 		break;
2454 	default:
2455 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2456 		break;
2457 	}
2458 
2459 	imsg_free(&imsg);
2460 	return err;
2461 }
2462 
2463 const struct got_error *
2464 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2465     int *nremotes, struct imsgbuf *ibuf)
2466 {
2467 	const struct got_error *err = NULL;
2468 	struct imsg imsg;
2469 	size_t datalen;
2470 	struct got_imsg_remotes iremotes;
2471 	struct got_imsg_remote iremote;
2472 	const size_t min_datalen =
2473 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2474 
2475 	*remotes = NULL;
2476 	*nremotes = 0;
2477 	iremotes.nremotes = 0;
2478 
2479 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2480 	if (err)
2481 		return err;
2482 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2483 
2484 	switch (imsg.hdr.type) {
2485 	case GOT_IMSG_GOTCONFIG_REMOTES:
2486 		if (datalen != sizeof(iremotes)) {
2487 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2488 			break;
2489 		}
2490 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2491 		if (iremotes.nremotes < 0) {
2492 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2493 			break;
2494 		}
2495 		if (iremotes.nremotes == 0) {
2496 			imsg_free(&imsg);
2497 			return NULL;
2498 		}
2499 		break;
2500 	default:
2501 		imsg_free(&imsg);
2502 		return got_error(GOT_ERR_PRIVSEP_MSG);
2503 	}
2504 
2505 	imsg_free(&imsg);
2506 
2507 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2508 	if (*remotes == NULL)
2509 		return got_error_from_errno("recallocarray");
2510 
2511 	while (*nremotes < iremotes.nremotes) {
2512 		struct got_remote_repo *remote;
2513 		const size_t min_datalen =
2514 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2515 		int i;
2516 
2517 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2518 		if (err)
2519 			break;
2520 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2521 
2522 		switch (imsg.hdr.type) {
2523 		case GOT_IMSG_GOTCONFIG_REMOTE:
2524 			remote = &(*remotes)[*nremotes];
2525 			memset(remote, 0, sizeof(*remote));
2526 			if (datalen < sizeof(iremote)) {
2527 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2528 				break;
2529 			}
2530 			memcpy(&iremote, imsg.data, sizeof(iremote));
2531 			if (iremote.name_len == 0 ||
2532 			    (iremote.fetch_url_len == 0 &&
2533 			    iremote.send_url_len == 0) ||
2534 			    (sizeof(iremote) + iremote.name_len +
2535 			    iremote.fetch_url_len + iremote.send_url_len) >
2536 			    datalen) {
2537 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2538 				break;
2539 			}
2540 			remote->name = strndup(imsg.data + sizeof(iremote),
2541 			    iremote.name_len);
2542 			if (remote->name == NULL) {
2543 				err = got_error_from_errno("strndup");
2544 				break;
2545 			}
2546 			remote->fetch_url = strndup(imsg.data +
2547 			    sizeof(iremote) + iremote.name_len,
2548 			    iremote.fetch_url_len);
2549 			if (remote->fetch_url == NULL) {
2550 				err = got_error_from_errno("strndup");
2551 				free_remote_data(remote);
2552 				break;
2553 			}
2554 			remote->send_url = strndup(imsg.data +
2555 			    sizeof(iremote) + iremote.name_len +
2556 			    iremote.fetch_url_len, iremote.send_url_len);
2557 			if (remote->send_url == NULL) {
2558 				err = got_error_from_errno("strndup");
2559 				free_remote_data(remote);
2560 				break;
2561 			}
2562 			remote->mirror_references = iremote.mirror_references;
2563 			remote->fetch_all_branches = iremote.fetch_all_branches;
2564 			if (iremote.nfetch_branches > 0) {
2565 				remote->fetch_branches = recallocarray(NULL, 0,
2566 				    iremote.nfetch_branches, sizeof(char *));
2567 				if (remote->fetch_branches == NULL) {
2568 					err = got_error_from_errno("calloc");
2569 					free_remote_data(remote);
2570 					break;
2571 				}
2572 			}
2573 			remote->nfetch_branches = 0;
2574 			for (i = 0; i < iremote.nfetch_branches; i++) {
2575 				char *branch;
2576 				err = got_privsep_recv_gotconfig_str(&branch,
2577 				    ibuf);
2578 				if (err) {
2579 					free_remote_data(remote);
2580 					goto done;
2581 				}
2582 				remote->fetch_branches[i] = branch;
2583 				remote->nfetch_branches++;
2584 			}
2585 			if (iremote.nsend_branches > 0) {
2586 				remote->send_branches = recallocarray(NULL, 0,
2587 				    iremote.nsend_branches, sizeof(char *));
2588 				if (remote->send_branches == NULL) {
2589 					err = got_error_from_errno("calloc");
2590 					free_remote_data(remote);
2591 					break;
2592 				}
2593 			}
2594 			remote->nsend_branches = 0;
2595 			for (i = 0; i < iremote.nsend_branches; i++) {
2596 				char *branch;
2597 				err = got_privsep_recv_gotconfig_str(&branch,
2598 				    ibuf);
2599 				if (err) {
2600 					free_remote_data(remote);
2601 					goto done;
2602 				}
2603 				remote->send_branches[i] = branch;
2604 				remote->nsend_branches++;
2605 			}
2606 			if (iremote.nfetch_refs > 0) {
2607 				remote->fetch_refs = recallocarray(NULL, 0,
2608 				    iremote.nfetch_refs, sizeof(char *));
2609 				if (remote->fetch_refs == NULL) {
2610 					err = got_error_from_errno("calloc");
2611 					free_remote_data(remote);
2612 					break;
2613 				}
2614 			}
2615 			remote->nfetch_refs = 0;
2616 			for (i = 0; i < iremote.nfetch_refs; i++) {
2617 				char *ref;
2618 				err = got_privsep_recv_gotconfig_str(&ref,
2619 				    ibuf);
2620 				if (err) {
2621 					free_remote_data(remote);
2622 					goto done;
2623 				}
2624 				remote->fetch_refs[i] = ref;
2625 				remote->nfetch_refs++;
2626 			}
2627 			(*nremotes)++;
2628 			break;
2629 		default:
2630 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2631 			break;
2632 		}
2633 
2634 		imsg_free(&imsg);
2635 		if (err)
2636 			break;
2637 	}
2638 done:
2639 	if (err) {
2640 		int i;
2641 		for (i = 0; i < *nremotes; i++)
2642 			free_remote_data(&(*remotes)[i]);
2643 		free(*remotes);
2644 		*remotes = NULL;
2645 		*nremotes = 0;
2646 	}
2647 	return err;
2648 }
2649 
2650 const struct got_error *
2651 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2652     struct got_object_id *id, int idx, const char *path)
2653 {
2654 	struct ibuf *wbuf;
2655 	size_t path_len = strlen(path) + 1;
2656 
2657 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2658 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2659 	if (wbuf == NULL)
2660 		return got_error_from_errno(
2661 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2662 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2663 		return got_error_from_errno("imsg_add "
2664 		    "COMMIT_TRAVERSAL_REQUEST");
2665 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2666 		return got_error_from_errno("imsg_add "
2667 		    "COMMIT_TRAVERSAL_REQUEST");
2668 	if (imsg_add(wbuf, path, path_len) == -1)
2669 		return got_error_from_errno("imsg_add "
2670 		    "COMMIT_TRAVERSAL_REQUEST");
2671 
2672 	wbuf->fd = -1;
2673 	imsg_close(ibuf, wbuf);
2674 
2675 	return flush_imsg(ibuf);
2676 }
2677 
2678 const struct got_error *
2679 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2680     struct got_object_id **changed_commit_id,
2681     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2682 {
2683 	const struct got_error *err = NULL;
2684 	struct imsg imsg;
2685 	struct got_imsg_traversed_commits *icommits;
2686 	struct got_object_id *ids;
2687 	size_t datalen;
2688 	int i, done = 0;
2689 
2690 	*changed_commit = NULL;
2691 	*changed_commit_id = NULL;
2692 
2693 	while (!done) {
2694 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2695 		if (err)
2696 			return err;
2697 
2698 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2699 		switch (imsg.hdr.type) {
2700 		case GOT_IMSG_TRAVERSED_COMMITS:
2701 			icommits = imsg.data;
2702 			if (datalen != sizeof(*icommits) +
2703 			    icommits->ncommits * sizeof(*ids)) {
2704 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2705 				break;
2706 			}
2707 			ids = imsg.data + sizeof(*icommits);
2708 			for (i = 0; i < icommits->ncommits; i++) {
2709 				struct got_object_qid *qid;
2710 
2711 				err = got_object_qid_alloc_partial(&qid);
2712 				if (err)
2713 					break;
2714 				memcpy(&qid->id, &ids[i], sizeof(ids[i]));
2715 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2716 
2717 				/* The last commit may contain a change. */
2718 				if (i == icommits->ncommits - 1) {
2719 					*changed_commit_id =
2720 					    got_object_id_dup(&qid->id);
2721 					if (*changed_commit_id == NULL) {
2722 						err = got_error_from_errno(
2723 						    "got_object_id_dup");
2724 						break;
2725 					}
2726 				}
2727 			}
2728 			break;
2729 		case GOT_IMSG_COMMIT:
2730 			if (*changed_commit_id == NULL) {
2731 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2732 				break;
2733 			}
2734 			err = get_commit_from_imsg(changed_commit, &imsg,
2735 			    datalen, ibuf);
2736 			break;
2737 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2738 			done = 1;
2739 			break;
2740 		default:
2741 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2742 			break;
2743 		}
2744 
2745 		imsg_free(&imsg);
2746 		if (err)
2747 			break;
2748 	}
2749 
2750 	if (err)
2751 		got_object_id_queue_free(commit_ids);
2752 	return err;
2753 }
2754 
2755 const struct got_error *
2756 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2757     struct got_object_id *tree_id, const char *path,
2758     struct got_parsed_tree_entry *entries, int nentries)
2759 {
2760 	const struct got_error *err = NULL;
2761 	struct ibuf *wbuf;
2762 	size_t path_len = strlen(path);
2763 	size_t msglen;
2764 
2765 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2766 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2767 	if (wbuf == NULL)
2768 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2769 
2770 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2771 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2772 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2773 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2774 	if (imsg_add(wbuf, path, path_len) == -1)
2775 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2776 
2777 	wbuf->fd = -1;
2778 	imsg_close(ibuf, wbuf);
2779 
2780 	if (entries) {
2781 		err = send_tree_entries(ibuf, entries, nentries);
2782 		if (err)
2783 			return err;
2784 	}
2785 
2786 	return flush_imsg(ibuf);
2787 }
2788 
2789 const struct got_error *
2790 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2791 {
2792 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2793 	    0, 0, -1, NULL, 0) == -1)
2794 		return got_error_from_errno("imsg_compose "
2795 		    "OBJECT_ENUMERATION_REQUEST");
2796 
2797 	return flush_imsg(ibuf);
2798 }
2799 
2800 const struct got_error *
2801 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2802 {
2803 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2804 	    0, 0, -1, NULL, 0) == -1)
2805 		return got_error_from_errno("imsg_compose "
2806 		    "OBJECT_ENUMERATION_DONE");
2807 
2808 	return flush_imsg(ibuf);
2809 }
2810 
2811 const struct got_error *
2812 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2813 {
2814 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2815 	    0, 0, -1, NULL, 0) == -1)
2816 		return got_error_from_errno("imsg_compose "
2817 		    "OBJECT_ENUMERATION_INCOMPLETE");
2818 
2819 	return flush_imsg(ibuf);
2820 }
2821 
2822 const struct got_error *
2823 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2824     struct got_object_id *id, time_t mtime)
2825 {
2826 	struct ibuf *wbuf;
2827 
2828 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2829 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2830 	if (wbuf == NULL)
2831 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2832 
2833 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2834 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2835 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2836 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2837 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2838 
2839 	wbuf->fd = -1;
2840 	imsg_close(ibuf, wbuf);
2841 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2842 	return NULL;
2843 }
2844 
2845 const struct got_error *
2846 got_privsep_recv_enumerated_objects(int *found_all_objects,
2847     struct imsgbuf *ibuf,
2848     got_object_enumerate_commit_cb cb_commit,
2849     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2850     struct got_repository *repo)
2851 {
2852 	const struct got_error *err = NULL;
2853 	struct imsg imsg;
2854 	struct got_imsg_enumerated_commit *icommit = NULL;
2855 	struct got_object_id commit_id;
2856 	int have_commit = 0;
2857 	time_t mtime = 0;
2858 	struct got_tree_object tree;
2859 	struct got_imsg_enumerated_tree *itree;
2860 	struct got_object_id tree_id;
2861 	char *path = NULL, *canon_path = NULL;
2862 	size_t datalen, path_len;
2863 	int nentries = -1;
2864 	int done = 0;
2865 
2866 	*found_all_objects = 0;
2867 	memset(&tree, 0, sizeof(tree));
2868 
2869 	while (!done) {
2870 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2871 		if (err)
2872 			break;
2873 
2874 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2875 		switch (imsg.hdr.type) {
2876 		case GOT_IMSG_ENUMERATED_COMMIT:
2877 			if (have_commit && nentries != -1) {
2878 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2879 				break;
2880 			}
2881 			if (datalen != sizeof(*icommit)) {
2882 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2883 				break;
2884 			}
2885 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2886 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2887 			mtime = icommit->mtime;
2888 			have_commit = 1;
2889 			break;
2890 		case GOT_IMSG_ENUMERATED_TREE:
2891 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2892 			if (!have_commit) {
2893 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2894 				break;
2895 			}
2896 			if (datalen < sizeof(*itree)) {
2897 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2898 				break;
2899 			}
2900 			itree = imsg.data;
2901 			path_len = datalen - sizeof(*itree);
2902 			if (path_len == 0) {
2903 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2904 				break;
2905 			}
2906 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2907 			free(path);
2908 			path = strndup(imsg.data + sizeof(*itree), path_len);
2909 			if (path == NULL) {
2910 				err = got_error_from_errno("strndup");
2911 				break;
2912 			}
2913 			free(canon_path);
2914 			canon_path = malloc(path_len + 1);
2915 			if (canon_path == NULL) {
2916 				err = got_error_from_errno("malloc");
2917 				break;
2918 			}
2919 			if (!got_path_is_absolute(path)) {
2920 				err = got_error(GOT_ERR_BAD_PATH);
2921 				break;
2922 			}
2923 			if (got_path_is_root_dir(path)) {
2924 				/* XXX check what got_canonpath() does wrong */
2925 				canon_path[0] = '/';
2926 				canon_path[1] = '\0';
2927 			} else {
2928 				err = got_canonpath(path, canon_path,
2929 				    path_len + 1);
2930 				if (err)
2931 					break;
2932 			}
2933 			if (strcmp(path, canon_path) != 0) {
2934 				err = got_error(GOT_ERR_BAD_PATH);
2935 				break;
2936 			}
2937 			if (nentries != -1) {
2938 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2939 				break;
2940 			}
2941 			if (itree->nentries < -1) {
2942 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2943 				break;
2944 			}
2945 			if (itree->nentries == -1) {
2946 				/* Tree was not found in pack file. */
2947 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2948 				    path, repo);
2949 				break;
2950 			}
2951 			if (itree->nentries > INT_MAX) {
2952 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2953 				break;
2954 			}
2955 			tree.entries = calloc(itree->nentries,
2956 			    sizeof(struct got_tree_entry));
2957 			if (tree.entries == NULL) {
2958 				err = got_error_from_errno("calloc");
2959 				break;
2960 			}
2961 			if (itree->nentries == 0) {
2962 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2963 				    path, repo);
2964 				if (err)
2965 					break;
2966 
2967 				/* Prepare for next tree. */
2968 				free(tree.entries);
2969 				memset(&tree, 0, sizeof(tree));
2970 				nentries = -1;
2971 			} else {
2972 				tree.nentries = itree->nentries;
2973 				nentries = 0;
2974 			}
2975 			break;
2976 		case GOT_IMSG_TREE_ENTRIES:
2977 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2978 			if (nentries <= -1) {
2979 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2980 				break;
2981 			}
2982 			err = recv_tree_entries(imsg.data, datalen,
2983 			    &tree, &nentries);
2984 			if (err)
2985 				break;
2986 			if (tree.nentries == nentries) {
2987 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2988 				    path, repo);
2989 				if (err)
2990 					break;
2991 
2992 				/* Prepare for next tree. */
2993 				free(tree.entries);
2994 				memset(&tree, 0, sizeof(tree));
2995 				nentries = -1;
2996 			}
2997 			break;
2998 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2999 			/* All trees have been found and traversed. */
3000 			if (!have_commit || path == NULL || nentries != -1) {
3001 				err = got_error(GOT_ERR_PRIVSEP_MSG);
3002 				break;
3003 			}
3004 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
3005 			if (err)
3006 				break;
3007 			have_commit = 0;
3008 			break;
3009 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
3010 			*found_all_objects = 1;
3011 			done = 1;
3012 			break;
3013 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
3014 			done = 1;
3015 			break;
3016 		default:
3017 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3018 			break;
3019 		}
3020 
3021 		imsg_free(&imsg);
3022 		if (err)
3023 			break;
3024 	}
3025 
3026 	free(path);
3027 	free(canon_path);
3028 	free(tree.entries);
3029 	return err;
3030 }
3031 
3032 const struct got_error *
3033 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3034     struct got_object_id *id)
3035 {
3036 	struct got_imsg_raw_delta_request dreq;
3037 
3038 	memset(&dreq, 0, sizeof(dreq));
3039 	dreq.idx = idx;
3040 	memcpy(&dreq.id, id, sizeof(dreq.id));
3041 
3042 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3043 	    &dreq, sizeof(dreq)) == -1)
3044 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3045 
3046 	return flush_imsg(ibuf);
3047 }
3048 
3049 const struct got_error *
3050 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3051 {
3052 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3053 }
3054 
3055 const struct got_error *
3056 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3057     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3058     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3059 {
3060 	struct got_imsg_raw_delta idelta;
3061 	int ret;
3062 
3063 	memset(&idelta, 0, sizeof(idelta));
3064 	idelta.base_size = base_size;
3065 	idelta.result_size = result_size;
3066 	idelta.delta_size = delta_size;
3067 	idelta.delta_compressed_size = delta_compressed_size;
3068 	idelta.delta_offset = delta_offset;
3069 	idelta.delta_out_offset = delta_out_offset;
3070 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3071 
3072 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3073 	    &idelta, sizeof(idelta));
3074 	if (ret == -1)
3075 		return got_error_from_errno("imsg_compose RAW_DELTA");
3076 
3077 	return flush_imsg(ibuf);
3078 }
3079 
3080 const struct got_error *
3081 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3082     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3083     off_t *delta_out_offset, struct got_object_id **base_id,
3084     struct imsgbuf *ibuf)
3085 {
3086 	const struct got_error *err = NULL;
3087 	struct imsg imsg;
3088 	struct got_imsg_raw_delta *delta;
3089 	size_t datalen;
3090 
3091 	*base_size = 0;
3092 	*result_size = 0;
3093 	*delta_size = 0;
3094 	*delta_compressed_size = 0;
3095 	*delta_offset = 0;
3096 	*delta_out_offset = 0;
3097 	*base_id = NULL;
3098 
3099 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3100 	if (err)
3101 		return err;
3102 
3103 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3104 
3105 	switch (imsg.hdr.type) {
3106 	case GOT_IMSG_RAW_DELTA:
3107 		if (datalen != sizeof(*delta)) {
3108 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3109 			break;
3110 		}
3111 		delta = imsg.data;
3112 		*base_size = delta->base_size;
3113 		*result_size = delta->result_size;
3114 		*delta_size = delta->delta_size;
3115 		*delta_compressed_size = delta->delta_compressed_size;
3116 		*delta_offset = delta->delta_offset;
3117 		*delta_out_offset = delta->delta_out_offset;
3118 		*base_id = calloc(1, sizeof(**base_id));
3119 		if (*base_id == NULL) {
3120 			err = got_error_from_errno("malloc");
3121 			break;
3122 		}
3123 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3124 		break;
3125 	default:
3126 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3127 		break;
3128 	}
3129 
3130 	imsg_free(&imsg);
3131 
3132 	if (err) {
3133 		free(*base_id);
3134 		*base_id = NULL;
3135 	}
3136 	return err;
3137 }
3138 
3139 static const struct got_error *
3140 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3141 {
3142 	const struct got_error *err = NULL;
3143 	struct got_imsg_object_idlist idlist;
3144 	struct ibuf *wbuf;
3145 	size_t i;
3146 
3147 	memset(&idlist, 0, sizeof(idlist));
3148 
3149 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3150 		return got_error(GOT_ERR_NO_SPACE);
3151 
3152 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3153 	    sizeof(idlist) + nids * sizeof(**ids));
3154 	if (wbuf == NULL) {
3155 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3156 		return err;
3157 	}
3158 
3159 	idlist.nids = nids;
3160 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3161 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3162 
3163 	for (i = 0; i < nids; i++) {
3164 		struct got_object_id *id = ids[i];
3165 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3166 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3167 	}
3168 
3169 	wbuf->fd = -1;
3170 	imsg_close(ibuf, wbuf);
3171 
3172 	return flush_imsg(ibuf);
3173 }
3174 
3175 const struct got_error *
3176 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3177     struct got_object_id **ids, size_t nids)
3178 {
3179 	const struct got_error *err = NULL;
3180 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3181 	int i, queued = 0;
3182 
3183 	for (i = 0; i < nids; i++) {
3184 		idlist[i % nitems(idlist)] = ids[i];
3185 		queued++;
3186 		if (queued >= nitems(idlist)) {
3187 			err = send_idlist(ibuf, idlist, queued);
3188 			if (err)
3189 				return err;
3190 			queued = 0;
3191 		}
3192 	}
3193 
3194 	if (queued > 0) {
3195 		err = send_idlist(ibuf, idlist, queued);
3196 		if (err)
3197 			return err;
3198 	}
3199 
3200 	return NULL;
3201 }
3202 
3203 const struct got_error *
3204 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3205 {
3206 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3207 	    == -1)
3208 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3209 
3210 	return flush_imsg(ibuf);
3211 }
3212 
3213 const struct got_error *
3214 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3215     size_t *nids, struct imsgbuf *ibuf)
3216 {
3217 	const struct got_error *err = NULL;
3218 	struct imsg imsg;
3219 	struct got_imsg_object_idlist *idlist;
3220 	size_t datalen;
3221 
3222 	*ids = NULL;
3223 	*done = 0;
3224 	*nids = 0;
3225 
3226 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3227 	if (err)
3228 		return err;
3229 
3230 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3231 	switch (imsg.hdr.type) {
3232 	case GOT_IMSG_OBJ_ID_LIST:
3233 		if (datalen < sizeof(*idlist)) {
3234 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3235 			break;
3236 		}
3237 		idlist = imsg.data;
3238 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3239 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3240 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3241 			break;
3242 		}
3243 		*nids = idlist->nids;
3244 		*ids = calloc(*nids, sizeof(**ids));
3245 		if (*ids == NULL) {
3246 			err = got_error_from_errno("calloc");
3247 			break;
3248 		}
3249 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3250 		    *nids * sizeof(**ids));
3251 		break;
3252 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3253 		*done = 1;
3254 		break;
3255 	default:
3256 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3257 		break;
3258 	}
3259 
3260 	imsg_free(&imsg);
3261 
3262 	return err;
3263 }
3264 
3265 const struct got_error *
3266 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3267 {
3268 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3269 	    == -1)
3270 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3271 
3272 	return flush_imsg(ibuf);
3273 }
3274 
3275 const struct got_error *
3276 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3277     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3278 {
3279 	const struct got_error *err = NULL;
3280 	struct ibuf *wbuf;
3281 	struct got_imsg_reused_deltas ideltas;
3282 	size_t i;
3283 
3284 	memset(&ideltas, 0, sizeof(ideltas));
3285 
3286 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3287 		return got_error(GOT_ERR_NO_SPACE);
3288 
3289 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3290 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3291 	if (wbuf == NULL) {
3292 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3293 		return err;
3294 	}
3295 
3296 	ideltas.ndeltas = ndeltas;
3297 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3298 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3299 
3300 	for (i = 0; i < ndeltas; i++) {
3301 		struct got_imsg_reused_delta *delta = &deltas[i];
3302 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3303 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3304 	}
3305 
3306 	wbuf->fd = -1;
3307 	imsg_close(ibuf, wbuf);
3308 
3309 	return flush_imsg(ibuf);
3310 }
3311 
3312 const struct got_error *
3313 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3314 {
3315 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3316 	    == -1)
3317 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3318 
3319 	return flush_imsg(ibuf);
3320 }
3321 
3322 const struct got_error *
3323 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3324     size_t *ndeltas, struct imsgbuf *ibuf)
3325 {
3326 	const struct got_error *err = NULL;
3327 	struct imsg imsg;
3328 	struct got_imsg_reused_deltas *ideltas;
3329 	size_t datalen;
3330 
3331 	*done = 0;
3332 	*ndeltas = 0;
3333 
3334 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3335 	if (err)
3336 		return err;
3337 
3338 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3339 	switch (imsg.hdr.type) {
3340 	case GOT_IMSG_REUSED_DELTAS:
3341 		if (datalen < sizeof(*ideltas)) {
3342 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3343 			break;
3344 		}
3345 		ideltas = imsg.data;
3346 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3347 		    ideltas->ndeltas * sizeof(*deltas) >
3348 		    datalen - sizeof(*ideltas)) {
3349 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3350 			break;
3351 		}
3352 		*ndeltas = ideltas->ndeltas;
3353 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3354 		    *ndeltas * sizeof(*deltas));
3355 		break;
3356 	case GOT_IMSG_DELTA_REUSE_DONE:
3357 		*done = 1;
3358 		break;
3359 	default:
3360 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3361 		break;
3362 	}
3363 
3364 	imsg_free(&imsg);
3365 
3366 	return err;
3367 }
3368 
3369 const struct got_error *
3370 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3371 {
3372 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3373 	    0, 0, -1, NULL, 0)
3374 	    == -1)
3375 		return got_error_from_errno("imsg_compose "
3376 		    "COMMIT_PAINTING_INIT");
3377 
3378 	return flush_imsg(ibuf);
3379 }
3380 
3381 const struct got_error *
3382 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3383     struct got_object_id *id, intptr_t color)
3384 {
3385 	struct got_imsg_commit_painting_request ireq;
3386 
3387 	memset(&ireq, 0, sizeof(ireq));
3388 	memcpy(&ireq.id, id, sizeof(ireq.id));
3389 	ireq.idx = idx;
3390 	ireq.color = color;
3391 
3392 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3393 	    &ireq, sizeof(ireq)) == -1)
3394 		return got_error_from_errno("imsg_compose "
3395 		    "COMMIT_PAINTING_REQUEST");
3396 
3397 	return flush_imsg(ibuf);
3398 }
3399 
3400 static const struct got_error *
3401 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3402     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3403 {
3404 	const struct got_error *err = NULL;
3405 	struct ibuf *wbuf = NULL;
3406 	struct got_object_qid *qid;
3407 	size_t msglen;
3408 	int ncommits;
3409 	intptr_t color;
3410 
3411 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3412 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3413 	    sizeof(struct got_imsg_painted_commit);
3414 
3415 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3416 	if (wbuf == NULL) {
3417 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3418 		return err;
3419 	}
3420 
3421 	/* Keep in sync with struct got_imsg_painted_commits! */
3422 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3423 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3424 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3425 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3426 
3427 	while (ncommits > 0) {
3428 		qid = STAILQ_FIRST(ids);
3429 		STAILQ_REMOVE_HEAD(ids, entry);
3430 		ncommits--;
3431 		(*nids)--;
3432 		color = (intptr_t)qid->data;
3433 
3434 		/* Keep in sync with struct got_imsg_painted_commit! */
3435 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3436 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3437 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3438 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3439 
3440 		got_object_qid_free(qid);
3441 	}
3442 
3443 	wbuf->fd = -1;
3444 	imsg_close(ibuf, wbuf);
3445 
3446 	return flush_imsg(ibuf);
3447 }
3448 
3449 const struct got_error *
3450 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3451     struct got_object_id_queue *ids, int *nids,
3452     int present_in_pack, int flush)
3453 {
3454 	const struct got_error *err;
3455 	size_t remain;
3456 
3457 	if (*nids <= 0)
3458 		return NULL;
3459 
3460 	do {
3461 		remain = (sizeof(struct got_imsg_painted_commits)) +
3462 		    *nids * sizeof(struct got_imsg_painted_commit);
3463 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3464 			err = send_painted_commits(ids, nids, remain,
3465 			    present_in_pack, ibuf);
3466 			if (err)
3467 				return err;
3468 		}
3469 	} while (flush && *nids > 0);
3470 
3471 	return NULL;
3472 }
3473 
3474 const struct got_error *
3475 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3476 {
3477 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3478 	    0, 0, -1, NULL, 0)
3479 	    == -1)
3480 		return got_error_from_errno("imsg_compose "
3481 		    "COMMIT_PAINTING_DONE");
3482 
3483 	return flush_imsg(ibuf);
3484 }
3485 
3486 const struct got_error *
3487 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3488     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3489 {
3490 	const struct got_error *err = NULL;
3491 	struct imsg imsg;
3492 	struct got_imsg_painted_commits icommits;
3493 	struct got_imsg_painted_commit icommit;
3494 	size_t datalen;
3495 	int i;
3496 
3497 	for (;;) {
3498 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3499 		if (err)
3500 			return err;
3501 
3502 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3503 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3504 			break;
3505 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3506 			return got_error(GOT_ERR_PRIVSEP_MSG);
3507 
3508 		if (datalen < sizeof(icommits))
3509 			return got_error(GOT_ERR_PRIVSEP_LEN);
3510 		memcpy(&icommits, imsg.data, sizeof(icommits));
3511 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3512 		    datalen < sizeof(icommits) +
3513 		    icommits.ncommits * sizeof(icommit))
3514 			return got_error(GOT_ERR_PRIVSEP_LEN);
3515 
3516 		for (i = 0; i < icommits.ncommits; i++) {
3517 			memcpy(&icommit,
3518 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3519 			    sizeof(icommit));
3520 
3521 			if (icommits.present_in_pack) {
3522 				struct got_object_id id;
3523 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3524 				err = cb(cb_arg, &id, icommit.color);
3525 				if (err)
3526 					break;
3527 			} else {
3528 				struct got_object_qid *qid;
3529 				err = got_object_qid_alloc_partial(&qid);
3530 				if (err)
3531 					break;
3532 				memcpy(qid->id.sha1, icommit.id,
3533 				    SHA1_DIGEST_LENGTH);
3534 				qid->data = (void *)icommit.color;
3535 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3536 			}
3537 		}
3538 
3539 		imsg_free(&imsg);
3540 	}
3541 
3542 	return err;
3543 }
3544 
3545 const struct got_error *
3546 got_privsep_unveil_exec_helpers(void)
3547 {
3548 	const char *helpers[] = {
3549 	    GOT_PATH_PROG_READ_PACK,
3550 	    GOT_PATH_PROG_READ_OBJECT,
3551 	    GOT_PATH_PROG_READ_COMMIT,
3552 	    GOT_PATH_PROG_READ_TREE,
3553 	    GOT_PATH_PROG_READ_BLOB,
3554 	    GOT_PATH_PROG_READ_TAG,
3555 	    GOT_PATH_PROG_READ_GITCONFIG,
3556 	    GOT_PATH_PROG_READ_GOTCONFIG,
3557 	    GOT_PATH_PROG_READ_PATCH,
3558 	    GOT_PATH_PROG_FETCH_PACK,
3559 	    GOT_PATH_PROG_INDEX_PACK,
3560 	    GOT_PATH_PROG_SEND_PACK,
3561 	};
3562 	size_t i;
3563 
3564 	for (i = 0; i < nitems(helpers); i++) {
3565 		if (unveil(helpers[i], "x") == 0)
3566 			continue;
3567 		return got_error_from_errno2("unveil", helpers[i]);
3568 	}
3569 
3570 	return NULL;
3571 }
3572 
3573 void
3574 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3575 {
3576 	if (close(imsg_fds[0]) == -1) {
3577 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3578 		_exit(1);
3579 	}
3580 
3581 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3582 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3583 		_exit(1);
3584 	}
3585 
3586 	closefrom(GOT_IMSG_FD_CHILD + 1);
3587 
3588 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3589 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3590 		    strerror(errno));
3591 		_exit(1);
3592 	}
3593 }