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