Game of Trees Repos

Blob

Date:: Thu Feb 2 11:18:55 2023 UTC
Message:: typo in comment it serializes the struct got_imsg_tree_entry, not tree_object. grep aid.
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <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, 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, sizeof(*id)) == -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, 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, 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, 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, sizeof(*id)) == -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 <= sizeof(**id)) {
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, imsg.data, sizeof(**id));
749 		*refname = strndup(imsg.data + sizeof(**id),
750 		    datalen - sizeof(**id));
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, sizeof(*id)) == -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, &iremote_ref.id, sizeof(*id));
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, char **errmsg, 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 	*errmsg = NULL;
979 
980 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
981 	if (err)
982 		return err;
983 
984 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
985 	switch (imsg.hdr.type) {
986 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
987 		if (datalen < sizeof(*bytes_sent)) {
988 			err = got_error(GOT_ERR_PRIVSEP_MSG);
989 			break;
990 		}
991 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
992 		break;
993 	case GOT_IMSG_SEND_REF_STATUS:
994 		if (datalen < sizeof(iref_status)) {
995 			err = got_error(GOT_ERR_PRIVSEP_MSG);
996 			break;
997 		}
998 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
999 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1000 		    iref_status.errmsg_len) {
1001 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1002 			break;
1003 		}
1004 		*success = iref_status.success;
1005 		*refname = strndup(imsg.data + sizeof(iref_status),
1006 		    iref_status.name_len);
1007 
1008 		if (iref_status.errmsg_len != 0)
1009 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1010 			    iref_status.name_len, iref_status.errmsg_len);
1011 		break;
1012 	case GOT_IMSG_SEND_DONE:
1013 		if (datalen != 0) {
1014 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1015 			break;
1016 		}
1017 		*done = 1;
1018 		break;
1019 	default:
1020 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1021 		break;
1022 	}
1023 
1024 	imsg_free(&imsg);
1025 	return err;
1026 }
1027 
1028 const struct got_error *
1029 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1030     int fd)
1031 {
1032 	const struct got_error *err = NULL;
1033 
1034 	/* Keep in sync with struct got_imsg_index_pack_request */
1035 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1036 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1037 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1038 		close(fd);
1039 		return err;
1040 	}
1041 	return flush_imsg(ibuf);
1042 }
1043 
1044 const struct got_error *
1045 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1046 {
1047 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1048 }
1049 
1050 const struct got_error *
1051 got_privsep_recv_index_progress(int *done, int *nobj_total,
1052     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1053     struct imsgbuf *ibuf)
1054 {
1055 	const struct got_error *err = NULL;
1056 	struct imsg imsg;
1057 	struct got_imsg_index_pack_progress *iprogress;
1058 	size_t datalen;
1059 
1060 	*done = 0;
1061 	*nobj_total = 0;
1062 	*nobj_indexed = 0;
1063 	*nobj_resolved = 0;
1064 
1065 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1066 	if (err)
1067 		return err;
1068 
1069 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1070 	switch (imsg.hdr.type) {
1071 	case GOT_IMSG_IDXPACK_PROGRESS:
1072 		if (datalen < sizeof(*iprogress)) {
1073 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1074 			break;
1075 		}
1076 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1077 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1078 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1079 			err = got_error(GOT_ERR_RANGE);
1080 			break;
1081 		}
1082 		*nobj_total = iprogress->nobj_total;
1083 		*nobj_indexed = iprogress->nobj_indexed;
1084 		*nobj_loose = iprogress->nobj_loose;
1085 		*nobj_resolved = iprogress->nobj_resolved;
1086 		break;
1087 	case GOT_IMSG_IDXPACK_DONE:
1088 		if (datalen != 0) {
1089 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1090 			break;
1091 		}
1092 		*done = 1;
1093 		break;
1094 	default:
1095 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1096 		break;
1097 	}
1098 
1099 	imsg_free(&imsg);
1100 	return err;
1101 }
1102 
1103 const struct got_error *
1104 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1105     struct imsgbuf *ibuf)
1106 {
1107 	struct got_imsg_object *iobj;
1108 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1109 
1110 	if (datalen != sizeof(*iobj))
1111 		return got_error(GOT_ERR_PRIVSEP_LEN);
1112 	iobj = imsg->data;
1113 
1114 	if (iobj->pack_offset < 0)
1115 		return got_error(GOT_ERR_PACK_OFFSET);
1116 
1117 	*obj = calloc(1, sizeof(**obj));
1118 	if (*obj == NULL)
1119 		return got_error_from_errno("calloc");
1120 
1121 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1122 	(*obj)->type = iobj->type;
1123 	(*obj)->flags = iobj->flags;
1124 	(*obj)->hdrlen = iobj->hdrlen;
1125 	(*obj)->size = iobj->size;
1126 	/* path_packfile is handled by caller */
1127 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1128 		(*obj)->pack_offset = iobj->pack_offset;
1129 		(*obj)->pack_idx = iobj->pack_idx;
1130 	}
1131 	STAILQ_INIT(&(*obj)->deltas.entries);
1132 	return NULL;
1133 }
1134 
1135 const struct got_error *
1136 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1137 {
1138 	const struct got_error *err = NULL;
1139 	struct imsg imsg;
1140 	const size_t min_datalen =
1141 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1142 
1143 	*obj = NULL;
1144 
1145 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1146 	if (err)
1147 		return err;
1148 
1149 	switch (imsg.hdr.type) {
1150 	case GOT_IMSG_OBJECT:
1151 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1152 		break;
1153 	default:
1154 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1155 		break;
1156 	}
1157 
1158 	imsg_free(&imsg);
1159 
1160 	return err;
1161 }
1162 
1163 static const struct got_error *
1164 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1165     size_t logmsg_len)
1166 {
1167 	const struct got_error *err = NULL;
1168 	size_t offset, remain;
1169 
1170 	offset = 0;
1171 	remain = logmsg_len;
1172 	while (remain > 0) {
1173 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1174 
1175 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1176 		    commit->logmsg + offset, n) == -1) {
1177 			err = got_error_from_errno("imsg_compose "
1178 			    "COMMIT_LOGMSG");
1179 			break;
1180 		}
1181 
1182 		err = flush_imsg(ibuf);
1183 		if (err)
1184 			break;
1185 
1186 		offset += n;
1187 		remain -= n;
1188 	}
1189 
1190 	return err;
1191 }
1192 
1193 const struct got_error *
1194 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1195 {
1196 	const struct got_error *err = NULL;
1197 	struct got_imsg_commit_object *icommit;
1198 	uint8_t *buf;
1199 	size_t len, total;
1200 	struct got_object_qid *qid;
1201 	size_t author_len = strlen(commit->author);
1202 	size_t committer_len = strlen(commit->committer);
1203 	size_t logmsg_len = strlen(commit->logmsg);
1204 
1205 	total = sizeof(*icommit) + author_len + committer_len +
1206 	    commit->nparents * sizeof(struct got_object_id);
1207 
1208 	buf = malloc(total);
1209 	if (buf == NULL)
1210 		return got_error_from_errno("malloc");
1211 
1212 	icommit = (struct got_imsg_commit_object *)buf;
1213 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1214 	icommit->author_len = author_len;
1215 	icommit->author_time = commit->author_time;
1216 	icommit->author_gmtoff = commit->author_gmtoff;
1217 	icommit->committer_len = committer_len;
1218 	icommit->committer_time = commit->committer_time;
1219 	icommit->committer_gmtoff = commit->committer_gmtoff;
1220 	icommit->logmsg_len = logmsg_len;
1221 	icommit->nparents = commit->nparents;
1222 
1223 	len = sizeof(*icommit);
1224 	memcpy(buf + len, commit->author, author_len);
1225 	len += author_len;
1226 	memcpy(buf + len, commit->committer, committer_len);
1227 	len += committer_len;
1228 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1229 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1230 		len += sizeof(qid->id);
1231 	}
1232 
1233 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1234 		err = got_error_from_errno("imsg_compose COMMIT");
1235 		goto done;
1236 	}
1237 
1238 	if (logmsg_len == 0 ||
1239 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1240 		err = flush_imsg(ibuf);
1241 		if (err)
1242 			goto done;
1243 	}
1244 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1245 done:
1246 	free(buf);
1247 	return err;
1248 }
1249 
1250 static const struct got_error *
1251 get_commit_from_imsg(struct got_commit_object **commit,
1252     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1253 {
1254 	const struct got_error *err = NULL;
1255 	struct got_imsg_commit_object *icommit;
1256 	size_t len = 0;
1257 	int i;
1258 
1259 	if (datalen < sizeof(*icommit))
1260 		return got_error(GOT_ERR_PRIVSEP_LEN);
1261 
1262 	icommit = imsg->data;
1263 	if (datalen != sizeof(*icommit) + icommit->author_len +
1264 	    icommit->committer_len +
1265 	    icommit->nparents * sizeof(struct got_object_id))
1266 		return got_error(GOT_ERR_PRIVSEP_LEN);
1267 
1268 	if (icommit->nparents < 0)
1269 		return got_error(GOT_ERR_PRIVSEP_LEN);
1270 
1271 	len += sizeof(*icommit);
1272 
1273 	*commit = got_object_commit_alloc_partial();
1274 	if (*commit == NULL)
1275 		return got_error_from_errno(
1276 		    "got_object_commit_alloc_partial");
1277 
1278 	memcpy((*commit)->tree_id, &icommit->tree_id,
1279 	    sizeof(icommit->tree_id));
1280 	(*commit)->author_time = icommit->author_time;
1281 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1282 	(*commit)->committer_time = icommit->committer_time;
1283 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1284 
1285 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1286 	if ((*commit)->author == NULL) {
1287 		err = got_error_from_errno("strndup");
1288 		goto done;
1289 	}
1290 	len += icommit->author_len;
1291 
1292 	(*commit)->committer = strndup(imsg->data + len,
1293 	    icommit->committer_len);
1294 	if ((*commit)->committer == NULL) {
1295 		err = got_error_from_errno("strndup");
1296 		goto done;
1297 	}
1298 	len += icommit->committer_len;
1299 
1300 	if (icommit->logmsg_len == 0) {
1301 		(*commit)->logmsg = strdup("");
1302 		if ((*commit)->logmsg == NULL) {
1303 			err = got_error_from_errno("strdup");
1304 			goto done;
1305 		}
1306 	} else {
1307 		size_t offset = 0, remain = icommit->logmsg_len;
1308 
1309 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1310 		if ((*commit)->logmsg == NULL) {
1311 			err = got_error_from_errno("malloc");
1312 			goto done;
1313 		}
1314 		while (remain > 0) {
1315 			struct imsg imsg_log;
1316 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1317 			    remain);
1318 
1319 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1320 			if (err)
1321 				goto done;
1322 
1323 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1324 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1325 				goto done;
1326 			}
1327 
1328 			memcpy((*commit)->logmsg + offset,
1329 			    imsg_log.data, n);
1330 			imsg_free(&imsg_log);
1331 			offset += n;
1332 			remain -= n;
1333 		}
1334 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1335 	}
1336 
1337 	for (i = 0; i < icommit->nparents; i++) {
1338 		struct got_object_qid *qid;
1339 
1340 		err = got_object_qid_alloc_partial(&qid);
1341 		if (err)
1342 			break;
1343 		memcpy(&qid->id, imsg->data + len +
1344 		    i * sizeof(qid->id), sizeof(qid->id));
1345 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1346 		(*commit)->nparents++;
1347 	}
1348 done:
1349 	if (err) {
1350 		got_object_commit_close(*commit);
1351 		*commit = NULL;
1352 	}
1353 	return err;
1354 }
1355 
1356 const struct got_error *
1357 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1358 {
1359 	const struct got_error *err = NULL;
1360 	struct imsg imsg;
1361 	size_t datalen;
1362 	const size_t min_datalen =
1363 	    MIN(sizeof(struct got_imsg_error),
1364 	    sizeof(struct got_imsg_commit_object));
1365 
1366 	*commit = NULL;
1367 
1368 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1369 	if (err)
1370 		return err;
1371 
1372 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1373 
1374 	switch (imsg.hdr.type) {
1375 	case GOT_IMSG_COMMIT:
1376 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1377 		break;
1378 	default:
1379 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1380 		break;
1381 	}
1382 
1383 	imsg_free(&imsg);
1384 
1385 	return err;
1386 }
1387 
1388 static const struct got_error *
1389 send_tree_entries_batch(struct imsgbuf *ibuf,
1390     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1391 {
1392 	struct ibuf *wbuf;
1393 	struct got_imsg_tree_entries ientries;
1394 	int i;
1395 
1396 	memset(&ientries, 0, sizeof(ientries));
1397 
1398 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1399 	if (wbuf == NULL)
1400 		return got_error_from_errno("imsg_create TREE_ENTRY");
1401 
1402 	ientries.nentries = idxN - idx0 + 1;
1403 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1404 		return got_error_from_errno("imsg_add TREE_ENTRY");
1405 
1406 	for (i = idx0; i <= idxN; i++) {
1407 		struct got_parsed_tree_entry *pte = &entries[i];
1408 
1409 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1410 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1411 			return got_error_from_errno("imsg_add TREE_ENTRY");
1412 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1413 			return got_error_from_errno("imsg_add TREE_ENTRY");
1414 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1415 			return got_error_from_errno("imsg_add TREE_ENTRY");
1416 
1417 		/* Remaining bytes are the entry's name. */
1418 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1419 			return got_error_from_errno("imsg_add TREE_ENTRY");
1420 	}
1421 
1422 	wbuf->fd = -1;
1423 	imsg_close(ibuf, wbuf);
1424 	return NULL;
1425 }
1426 
1427 static const struct got_error *
1428 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1429     int nentries)
1430 {
1431 	const struct got_error *err = NULL;
1432 	int i, j;
1433 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1434 
1435 	i = 0;
1436 	for (j = 0; j < nentries; j++) {
1437 		struct got_parsed_tree_entry *pte = &entries[j];
1438 		size_t len = SHA1_DIGEST_LENGTH + sizeof(pte->mode) +
1439 		    sizeof(pte->namelen) + pte->namelen;
1440 
1441 		if (j > 0 &&
1442 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1443 			err = send_tree_entries_batch(ibuf, entries,
1444 			    i, j - 1, entries_len);
1445 			if (err)
1446 				return err;
1447 			i = j;
1448 			entries_len = sizeof(struct got_imsg_tree_entries);
1449 		}
1450 
1451 		entries_len += len;
1452 	}
1453 
1454 	if (j > 0) {
1455 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1456 		    entries_len);
1457 		if (err)
1458 			return err;
1459 	}
1460 
1461 	return NULL;
1462 }
1463 
1464 const struct got_error *
1465 got_privsep_send_tree(struct imsgbuf *ibuf,
1466     struct got_parsed_tree_entry *entries, int nentries)
1467 {
1468 	const struct got_error *err = NULL;
1469 	struct got_imsg_tree_object itree;
1470 
1471 	memset(&itree, 0, sizeof(itree));
1472 	itree.nentries = nentries;
1473 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1474 	    == -1)
1475 		return got_error_from_errno("imsg_compose TREE");
1476 
1477 	err = send_tree_entries(ibuf, entries, nentries);
1478 	if (err)
1479 		return err;
1480 
1481 	return flush_imsg(ibuf);
1482 }
1483 
1484 
1485 static const struct got_error *
1486 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1487     int *nentries)
1488 {
1489 	const struct got_error *err = NULL;
1490 	struct got_imsg_tree_entries *ientries;
1491 	struct got_tree_entry *te;
1492 	size_t te_offset;
1493 	size_t i;
1494 
1495 	if (datalen <= sizeof(*ientries) ||
1496 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1497 		return got_error(GOT_ERR_PRIVSEP_LEN);
1498 
1499 	ientries = (struct got_imsg_tree_entries *)data;
1500 	if (ientries->nentries > INT_MAX) {
1501 		return got_error_msg(GOT_ERR_NO_SPACE,
1502 		    "too many tree entries");
1503 	}
1504 
1505 	te_offset = sizeof(*ientries);
1506 	for (i = 0; i < ientries->nentries; i++) {
1507 		struct got_imsg_tree_entry ite;
1508 		const char *te_name;
1509 		uint8_t *buf = (uint8_t *)data + te_offset;
1510 
1511 		if (te_offset >= datalen) {
1512 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1513 			break;
1514 		}
1515 
1516 		/* Might not be aligned, size is ~32 bytes. */
1517 		memcpy(&ite, buf, sizeof(ite));
1518 
1519 		if (ite.namelen >= sizeof(te->name)) {
1520 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1521 			break;
1522 		}
1523 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1524 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1525 			break;
1526 		}
1527 
1528 		if (*nentries >= tree->nentries) {
1529 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1530 			break;
1531 		}
1532 		te = &tree->entries[*nentries];
1533 		te_name = buf + sizeof(ite);
1534 		memcpy(te->name, te_name, ite.namelen);
1535 		te->name[ite.namelen] = '\0';
1536 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1537 		te->mode = ite.mode;
1538 		te->idx = *nentries;
1539 		(*nentries)++;
1540 
1541 		te_offset += sizeof(ite) + ite.namelen;
1542 	}
1543 
1544 	return err;
1545 }
1546 
1547 const struct got_error *
1548 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1549 {
1550 	const struct got_error *err = NULL;
1551 	const size_t min_datalen =
1552 	    MIN(sizeof(struct got_imsg_error),
1553 	    sizeof(struct got_imsg_tree_object));
1554 	struct got_imsg_tree_object *itree;
1555 	int nentries = 0;
1556 
1557 	*tree = NULL;
1558 
1559 	while (*tree == NULL || nentries < (*tree)->nentries) {
1560 		struct imsg imsg;
1561 		size_t datalen;
1562 
1563 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1564 		if (err)
1565 			break;
1566 
1567 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1568 
1569 		switch (imsg.hdr.type) {
1570 		case GOT_IMSG_TREE:
1571 			/* This message should only appear once. */
1572 			if (*tree != NULL) {
1573 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1574 				break;
1575 			}
1576 			if (datalen != sizeof(*itree)) {
1577 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1578 				break;
1579 			}
1580 			itree = imsg.data;
1581 			if (itree->nentries < 0) {
1582 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1583 				break;
1584 			}
1585 			*tree = malloc(sizeof(**tree));
1586 			if (*tree == NULL) {
1587 				err = got_error_from_errno("malloc");
1588 				break;
1589 			}
1590 			(*tree)->entries = calloc(itree->nentries,
1591 			    sizeof(struct got_tree_entry));
1592 			if ((*tree)->entries == NULL) {
1593 				err = got_error_from_errno("malloc");
1594 				free(*tree);
1595 				*tree = NULL;
1596 				break;
1597 			}
1598 			(*tree)->nentries = itree->nentries;
1599 			(*tree)->refcnt = 0;
1600 			break;
1601 		case GOT_IMSG_TREE_ENTRIES:
1602 			/* This message should be preceeded by GOT_IMSG_TREE. */
1603 			if (*tree == NULL) {
1604 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1605 				break;
1606 			}
1607 			err = recv_tree_entries(imsg.data, datalen,
1608 			    *tree, &nentries);
1609 			break;
1610 		default:
1611 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1612 			break;
1613 		}
1614 
1615 		imsg_free(&imsg);
1616 		if (err)
1617 			break;
1618 	}
1619 
1620 	if (*tree && (*tree)->nentries != nentries) {
1621 		if (err == NULL)
1622 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1623 		got_object_tree_close(*tree);
1624 		*tree = NULL;
1625 	}
1626 
1627 	return err;
1628 }
1629 
1630 const struct got_error *
1631 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1632     const uint8_t *data)
1633 {
1634 	struct got_imsg_blob iblob;
1635 
1636 	memset(&iblob, 0, sizeof(iblob));
1637 	iblob.size = size;
1638 	iblob.hdrlen = hdrlen;
1639 
1640 	if (data) {
1641 		uint8_t *buf;
1642 
1643 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1644 			return got_error(GOT_ERR_NO_SPACE);
1645 
1646 		buf = malloc(sizeof(iblob) + size);
1647 		if (buf == NULL)
1648 			return got_error_from_errno("malloc");
1649 
1650 		memcpy(buf, &iblob, sizeof(iblob));
1651 		memcpy(buf + sizeof(iblob), data, size);
1652 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1653 		    sizeof(iblob) + size) == -1) {
1654 			free(buf);
1655 			return got_error_from_errno("imsg_compose BLOB");
1656 		}
1657 		free(buf);
1658 	} else {
1659 		/* Data has already been written to file descriptor. */
1660 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1661 		    sizeof(iblob)) == -1)
1662 			return got_error_from_errno("imsg_compose BLOB");
1663 	}
1664 
1665 
1666 	return flush_imsg(ibuf);
1667 }
1668 
1669 const struct got_error *
1670 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1671     struct imsgbuf *ibuf)
1672 {
1673 	const struct got_error *err = NULL;
1674 	struct imsg imsg;
1675 	struct got_imsg_blob *iblob;
1676 	size_t datalen;
1677 
1678 	*outbuf = NULL;
1679 
1680 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1681 	if (err)
1682 		return err;
1683 
1684 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1685 
1686 	switch (imsg.hdr.type) {
1687 	case GOT_IMSG_BLOB:
1688 		if (datalen < sizeof(*iblob)) {
1689 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1690 			break;
1691 		}
1692 		iblob = imsg.data;
1693 		*size = iblob->size;
1694 		*hdrlen = iblob->hdrlen;
1695 
1696 		if (datalen == sizeof(*iblob)) {
1697 			/* Data has been written to file descriptor. */
1698 			break;
1699 		}
1700 
1701 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1702 		    *size > datalen + sizeof(*iblob)) {
1703 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1704 			break;
1705 		}
1706 
1707 		*outbuf = malloc(*size);
1708 		if (*outbuf == NULL) {
1709 			err = got_error_from_errno("malloc");
1710 			break;
1711 		}
1712 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1713 		break;
1714 	default:
1715 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1716 		break;
1717 	}
1718 
1719 	imsg_free(&imsg);
1720 
1721 	return err;
1722 }
1723 
1724 static const struct got_error *
1725 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1726 {
1727 	const struct got_error *err = NULL;
1728 	size_t offset, remain;
1729 
1730 	offset = 0;
1731 	remain = tagmsg_len;
1732 	while (remain > 0) {
1733 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1734 
1735 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1736 		    tag->tagmsg + offset, n) == -1) {
1737 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1738 			break;
1739 		}
1740 
1741 		err = flush_imsg(ibuf);
1742 		if (err)
1743 			break;
1744 
1745 		offset += n;
1746 		remain -= n;
1747 	}
1748 
1749 	return err;
1750 }
1751 
1752 const struct got_error *
1753 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1754 {
1755 	const struct got_error *err = NULL;
1756 	struct got_imsg_tag_object *itag;
1757 	uint8_t *buf;
1758 	size_t len, total;
1759 	size_t tag_len = strlen(tag->tag);
1760 	size_t tagger_len = strlen(tag->tagger);
1761 	size_t tagmsg_len = strlen(tag->tagmsg);
1762 
1763 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1764 
1765 	buf = malloc(total);
1766 	if (buf == NULL)
1767 		return got_error_from_errno("malloc");
1768 
1769 	itag = (struct got_imsg_tag_object *)buf;
1770 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1771 	itag->obj_type = tag->obj_type;
1772 	itag->tag_len = tag_len;
1773 	itag->tagger_len = tagger_len;
1774 	itag->tagger_time = tag->tagger_time;
1775 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1776 	itag->tagmsg_len = tagmsg_len;
1777 
1778 	len = sizeof(*itag);
1779 	memcpy(buf + len, tag->tag, tag_len);
1780 	len += tag_len;
1781 	memcpy(buf + len, tag->tagger, tagger_len);
1782 	len += tagger_len;
1783 
1784 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1785 		err = got_error_from_errno("imsg_compose TAG");
1786 		goto done;
1787 	}
1788 
1789 	if (tagmsg_len == 0 ||
1790 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1791 		err = flush_imsg(ibuf);
1792 		if (err)
1793 			goto done;
1794 	}
1795 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1796 done:
1797 	free(buf);
1798 	return err;
1799 }
1800 
1801 const struct got_error *
1802 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1803 {
1804 	const struct got_error *err = NULL;
1805 	struct imsg imsg;
1806 	struct got_imsg_tag_object *itag;
1807 	size_t len, datalen;
1808 	const size_t min_datalen =
1809 	    MIN(sizeof(struct got_imsg_error),
1810 	    sizeof(struct got_imsg_tag_object));
1811 
1812 	*tag = NULL;
1813 
1814 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1815 	if (err)
1816 		return err;
1817 
1818 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1819 	len = 0;
1820 
1821 	switch (imsg.hdr.type) {
1822 	case GOT_IMSG_TAG:
1823 		if (datalen < sizeof(*itag)) {
1824 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1825 			break;
1826 		}
1827 		itag = imsg.data;
1828 		if (datalen != sizeof(*itag) + itag->tag_len +
1829 		    itag->tagger_len) {
1830 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1831 			break;
1832 		}
1833 		len += sizeof(*itag);
1834 
1835 		*tag = calloc(1, sizeof(**tag));
1836 		if (*tag == NULL) {
1837 			err = got_error_from_errno("calloc");
1838 			break;
1839 		}
1840 
1841 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1842 
1843 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1844 		if ((*tag)->tag == NULL) {
1845 			err = got_error_from_errno("strndup");
1846 			break;
1847 		}
1848 		len += itag->tag_len;
1849 
1850 		(*tag)->obj_type = itag->obj_type;
1851 		(*tag)->tagger_time = itag->tagger_time;
1852 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1853 
1854 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1855 		if ((*tag)->tagger == NULL) {
1856 			err = got_error_from_errno("strndup");
1857 			break;
1858 		}
1859 		len += itag->tagger_len;
1860 
1861 		if (itag->tagmsg_len == 0) {
1862 			(*tag)->tagmsg = strdup("");
1863 			if ((*tag)->tagmsg == NULL) {
1864 				err = got_error_from_errno("strdup");
1865 				break;
1866 			}
1867 		} else {
1868 			size_t offset = 0, remain = itag->tagmsg_len;
1869 
1870 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1871 			if ((*tag)->tagmsg == NULL) {
1872 				err = got_error_from_errno("malloc");
1873 				break;
1874 			}
1875 			while (remain > 0) {
1876 				struct imsg imsg_log;
1877 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1878 				    remain);
1879 
1880 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1881 				if (err)
1882 					return err;
1883 
1884 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1885 					return got_error(GOT_ERR_PRIVSEP_MSG);
1886 
1887 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1888 				    n);
1889 				imsg_free(&imsg_log);
1890 				offset += n;
1891 				remain -= n;
1892 			}
1893 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1894 		}
1895 
1896 		break;
1897 	default:
1898 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1899 		break;
1900 	}
1901 
1902 	imsg_free(&imsg);
1903 
1904 	return err;
1905 }
1906 
1907 const struct got_error *
1908 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1909     struct got_packidx *packidx)
1910 {
1911 	const struct got_error *err = NULL;
1912 	struct got_imsg_packidx ipackidx;
1913 	struct got_imsg_pack ipack;
1914 	int fd;
1915 
1916 	memset(&ipackidx, 0, sizeof(ipackidx));
1917 	memset(&ipack, 0, sizeof(ipack));
1918 
1919 	ipackidx.len = packidx->len;
1920 	ipackidx.packfile_size = pack->filesize;
1921 	fd = dup(packidx->fd);
1922 	if (fd == -1)
1923 		return got_error_from_errno("dup");
1924 
1925 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1926 	    sizeof(ipackidx)) == -1) {
1927 		err = got_error_from_errno("imsg_compose PACKIDX");
1928 		close(fd);
1929 		return err;
1930 	}
1931 
1932 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1933 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1934 		return got_error(GOT_ERR_NO_SPACE);
1935 	ipack.filesize = pack->filesize;
1936 
1937 	fd = dup(pack->fd);
1938 	if (fd == -1)
1939 		return got_error_from_errno("dup");
1940 
1941 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1942 	    == -1) {
1943 		err = got_error_from_errno("imsg_compose PACK");
1944 		close(fd);
1945 		return err;
1946 	}
1947 
1948 	return flush_imsg(ibuf);
1949 }
1950 
1951 const struct got_error *
1952 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1953     struct got_object_id *id)
1954 {
1955 	struct got_imsg_packed_object iobj;
1956 
1957 	memset(&iobj, 0, sizeof(iobj));
1958 	iobj.idx = idx;
1959 	memcpy(&iobj.id, id, sizeof(iobj.id));
1960 
1961 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1962 	    &iobj, sizeof(iobj)) == -1)
1963 		return got_error_from_errno("imsg_compose "
1964 		    "PACKED_OBJECT_REQUEST");
1965 
1966 	return flush_imsg(ibuf);
1967 }
1968 
1969 const struct got_error *
1970 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1971     struct got_object_id *id)
1972 {
1973 	struct got_imsg_packed_object iobj;
1974 
1975 	memset(&iobj, 0, sizeof(iobj));
1976 	iobj.idx = idx;
1977 	memcpy(&iobj.id, id, sizeof(iobj.id));
1978 
1979 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
1980 	    &iobj, sizeof(iobj)) == -1)
1981 		return got_error_from_errno("imsg_compose "
1982 		    "PACKED_OBJECT_REQUEST");
1983 
1984 	return flush_imsg(ibuf);
1985 }
1986 
1987 const struct got_error *
1988 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1989 {
1990 	const struct got_error *err = NULL;
1991 
1992 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1993 	    NULL, 0) == -1) {
1994 		err = got_error_from_errno("imsg_compose "
1995 		    "GITCONFIG_PARSE_REQUEST");
1996 		close(fd);
1997 		return err;
1998 	}
1999 
2000 	return flush_imsg(ibuf);
2001 }
2002 
2003 const struct got_error *
2004 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2005 {
2006 	if (imsg_compose(ibuf,
2007 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2008 	    NULL, 0) == -1)
2009 		return got_error_from_errno("imsg_compose "
2010 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2011 
2012 	return flush_imsg(ibuf);
2013 }
2014 
2015 const struct got_error *
2016 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2017 {
2018 	if (imsg_compose(ibuf,
2019 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2020 	    NULL, 0) == -1)
2021 		return got_error_from_errno("imsg_compose "
2022 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2023 
2024 	return flush_imsg(ibuf);
2025 }
2026 
2027 
2028 const struct got_error *
2029 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2030 {
2031 	if (imsg_compose(ibuf,
2032 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2033 		return got_error_from_errno("imsg_compose "
2034 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2035 
2036 	return flush_imsg(ibuf);
2037 }
2038 
2039 const struct got_error *
2040 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2041 {
2042 	if (imsg_compose(ibuf,
2043 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2044 		return got_error_from_errno("imsg_compose "
2045 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2046 
2047 	return flush_imsg(ibuf);
2048 }
2049 
2050 const struct got_error *
2051 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2052 {
2053 	if (imsg_compose(ibuf,
2054 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2055 		return got_error_from_errno("imsg_compose "
2056 		    "GITCONFIG_REMOTE_REQUEST");
2057 
2058 	return flush_imsg(ibuf);
2059 }
2060 
2061 const struct got_error *
2062 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2063 {
2064 	if (imsg_compose(ibuf,
2065 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2066 		return got_error_from_errno("imsg_compose "
2067 		    "GITCONFIG_OWNER_REQUEST");
2068 
2069 	return flush_imsg(ibuf);
2070 }
2071 
2072 const struct got_error *
2073 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2074 {
2075 	const struct got_error *err = NULL;
2076 	struct imsg imsg;
2077 	size_t datalen;
2078 
2079 	*str = NULL;
2080 
2081 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2082 	if (err)
2083 		return err;
2084 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2085 
2086 	switch (imsg.hdr.type) {
2087 	case GOT_IMSG_GITCONFIG_STR_VAL:
2088 		if (datalen == 0)
2089 			break;
2090 		*str = strndup(imsg.data, datalen);
2091 		if (*str == NULL) {
2092 			err = got_error_from_errno("strndup");
2093 			break;
2094 		}
2095 		break;
2096 	default:
2097 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2098 		break;
2099 	}
2100 
2101 	imsg_free(&imsg);
2102 	return err;
2103 }
2104 
2105 const struct got_error *
2106 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2107 {
2108 	const struct got_error *err = NULL;
2109 	struct imsg imsg;
2110 	size_t datalen;
2111 	const size_t min_datalen =
2112 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2113 
2114 	*val = 0;
2115 
2116 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2117 	if (err)
2118 		return err;
2119 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2120 
2121 	switch (imsg.hdr.type) {
2122 	case GOT_IMSG_GITCONFIG_INT_VAL:
2123 		if (datalen != sizeof(*val)) {
2124 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2125 			break;
2126 		}
2127 		memcpy(val, imsg.data, sizeof(*val));
2128 		break;
2129 	default:
2130 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2131 		break;
2132 	}
2133 
2134 	imsg_free(&imsg);
2135 	return err;
2136 }
2137 
2138 static void
2139 free_remote_data(struct got_remote_repo *remote)
2140 {
2141 	int i;
2142 
2143 	free(remote->name);
2144 	free(remote->fetch_url);
2145 	free(remote->send_url);
2146 	for (i = 0; i < remote->nfetch_branches; i++)
2147 		free(remote->fetch_branches[i]);
2148 	free(remote->fetch_branches);
2149 	for (i = 0; i < remote->nsend_branches; i++)
2150 		free(remote->send_branches[i]);
2151 	free(remote->send_branches);
2152 	for (i = 0; i < remote->nfetch_refs; i++)
2153 		free(remote->fetch_refs[i]);
2154 	free(remote->fetch_refs);
2155 }
2156 
2157 const struct got_error *
2158 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2159     int *nremotes, struct imsgbuf *ibuf)
2160 {
2161 	const struct got_error *err = NULL;
2162 	struct imsg imsg;
2163 	size_t datalen;
2164 	struct got_imsg_remotes iremotes;
2165 	struct got_imsg_remote iremote;
2166 
2167 	*remotes = NULL;
2168 	*nremotes = 0;
2169 	iremotes.nremotes = 0;
2170 
2171 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2172 	if (err)
2173 		return err;
2174 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2175 
2176 	switch (imsg.hdr.type) {
2177 	case GOT_IMSG_GITCONFIG_REMOTES:
2178 		if (datalen != sizeof(iremotes)) {
2179 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2180 			break;
2181 		}
2182 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2183 		if (iremotes.nremotes == 0) {
2184 			imsg_free(&imsg);
2185 			return NULL;
2186 		}
2187 		break;
2188 	default:
2189 		imsg_free(&imsg);
2190 		return got_error(GOT_ERR_PRIVSEP_MSG);
2191 	}
2192 
2193 	imsg_free(&imsg);
2194 
2195 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2196 	if (*remotes == NULL)
2197 		return got_error_from_errno("recallocarray");
2198 
2199 	while (*nremotes < iremotes.nremotes) {
2200 		struct got_remote_repo *remote;
2201 
2202 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2203 		if (err)
2204 			break;
2205 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2206 
2207 		switch (imsg.hdr.type) {
2208 		case GOT_IMSG_GITCONFIG_REMOTE:
2209 			remote = &(*remotes)[*nremotes];
2210 			memset(remote, 0, sizeof(*remote));
2211 			if (datalen < sizeof(iremote)) {
2212 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2213 				break;
2214 			}
2215 			memcpy(&iremote, imsg.data, sizeof(iremote));
2216 			if (iremote.name_len == 0 ||
2217 			    iremote.fetch_url_len == 0 ||
2218 			    iremote.send_url_len == 0 ||
2219 			    (sizeof(iremote) + iremote.name_len +
2220 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2221 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2222 				break;
2223 			}
2224 			remote->name = strndup(imsg.data + sizeof(iremote),
2225 			    iremote.name_len);
2226 			if (remote->name == NULL) {
2227 				err = got_error_from_errno("strndup");
2228 				break;
2229 			}
2230 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2231 			    iremote.name_len, iremote.fetch_url_len);
2232 			if (remote->fetch_url == NULL) {
2233 				err = got_error_from_errno("strndup");
2234 				free_remote_data(remote);
2235 				break;
2236 			}
2237 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2238 			    iremote.name_len + iremote.fetch_url_len,
2239 			    iremote.send_url_len);
2240 			if (remote->send_url == NULL) {
2241 				err = got_error_from_errno("strndup");
2242 				free_remote_data(remote);
2243 				break;
2244 			}
2245 			remote->mirror_references = iremote.mirror_references;
2246 			remote->fetch_all_branches = iremote.fetch_all_branches;
2247 			remote->nfetch_branches = 0;
2248 			remote->fetch_branches = NULL;
2249 			remote->nsend_branches = 0;
2250 			remote->send_branches = NULL;
2251 			remote->nfetch_refs = 0;
2252 			remote->fetch_refs = NULL;
2253 			(*nremotes)++;
2254 			break;
2255 		default:
2256 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2257 			break;
2258 		}
2259 
2260 		imsg_free(&imsg);
2261 		if (err)
2262 			break;
2263 	}
2264 
2265 	if (err) {
2266 		int i;
2267 		for (i = 0; i < *nremotes; i++)
2268 			free_remote_data(&(*remotes)[i]);
2269 		free(*remotes);
2270 		*remotes = NULL;
2271 		*nremotes = 0;
2272 	}
2273 	return err;
2274 }
2275 
2276 const struct got_error *
2277 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2278 {
2279 	const struct got_error *err = NULL;
2280 
2281 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2282 	    NULL, 0) == -1) {
2283 		err = got_error_from_errno("imsg_compose "
2284 		    "GOTCONFIG_PARSE_REQUEST");
2285 		close(fd);
2286 		return err;
2287 	}
2288 
2289 	return flush_imsg(ibuf);
2290 }
2291 
2292 const struct got_error *
2293 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2294 {
2295 	if (imsg_compose(ibuf,
2296 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2297 		return got_error_from_errno("imsg_compose "
2298 		    "GOTCONFIG_AUTHOR_REQUEST");
2299 
2300 	return flush_imsg(ibuf);
2301 }
2302 
2303 const struct got_error *
2304 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2305 {
2306 	if (imsg_compose(ibuf,
2307 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2308 		return got_error_from_errno("imsg_compose "
2309 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2310 
2311 	return flush_imsg(ibuf);
2312 }
2313 
2314 const struct got_error *
2315 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2316 {
2317 	if (imsg_compose(ibuf,
2318 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2319 		return got_error_from_errno("imsg_compose "
2320 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2321 
2322 	return flush_imsg(ibuf);
2323 }
2324 
2325 const struct got_error *
2326 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2327 {
2328 	if (imsg_compose(ibuf,
2329 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2330 		return got_error_from_errno("imsg_compose "
2331 		    "GOTCONFIG_SIGNERID_REQUEST");
2332 
2333 	return flush_imsg(ibuf);
2334 }
2335 
2336 const struct got_error *
2337 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2338 {
2339 	if (imsg_compose(ibuf,
2340 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2341 		return got_error_from_errno("imsg_compose "
2342 		    "GOTCONFIG_REMOTE_REQUEST");
2343 
2344 	return flush_imsg(ibuf);
2345 }
2346 
2347 const struct got_error *
2348 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2349 {
2350 	const struct got_error *err = NULL;
2351 	struct imsg imsg;
2352 	size_t datalen;
2353 
2354 	*str = NULL;
2355 
2356 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2357 	if (err)
2358 		return err;
2359 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2360 
2361 	switch (imsg.hdr.type) {
2362 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2363 		if (datalen == 0)
2364 			break;
2365 		*str = strndup(imsg.data, datalen);
2366 		if (*str == NULL) {
2367 			err = got_error_from_errno("strndup");
2368 			break;
2369 		}
2370 		break;
2371 	default:
2372 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2373 		break;
2374 	}
2375 
2376 	imsg_free(&imsg);
2377 	return err;
2378 }
2379 
2380 const struct got_error *
2381 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2382     int *nremotes, struct imsgbuf *ibuf)
2383 {
2384 	const struct got_error *err = NULL;
2385 	struct imsg imsg;
2386 	size_t datalen;
2387 	struct got_imsg_remotes iremotes;
2388 	struct got_imsg_remote iremote;
2389 	const size_t min_datalen =
2390 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2391 
2392 	*remotes = NULL;
2393 	*nremotes = 0;
2394 	iremotes.nremotes = 0;
2395 
2396 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2397 	if (err)
2398 		return err;
2399 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2400 
2401 	switch (imsg.hdr.type) {
2402 	case GOT_IMSG_GOTCONFIG_REMOTES:
2403 		if (datalen != sizeof(iremotes)) {
2404 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2405 			break;
2406 		}
2407 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2408 		if (iremotes.nremotes < 0) {
2409 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2410 			break;
2411 		}
2412 		if (iremotes.nremotes == 0) {
2413 			imsg_free(&imsg);
2414 			return NULL;
2415 		}
2416 		break;
2417 	default:
2418 		imsg_free(&imsg);
2419 		return got_error(GOT_ERR_PRIVSEP_MSG);
2420 	}
2421 
2422 	imsg_free(&imsg);
2423 
2424 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2425 	if (*remotes == NULL)
2426 		return got_error_from_errno("recallocarray");
2427 
2428 	while (*nremotes < iremotes.nremotes) {
2429 		struct got_remote_repo *remote;
2430 		const size_t min_datalen =
2431 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2432 		int i;
2433 
2434 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2435 		if (err)
2436 			break;
2437 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2438 
2439 		switch (imsg.hdr.type) {
2440 		case GOT_IMSG_GOTCONFIG_REMOTE:
2441 			remote = &(*remotes)[*nremotes];
2442 			memset(remote, 0, sizeof(*remote));
2443 			if (datalen < sizeof(iremote)) {
2444 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2445 				break;
2446 			}
2447 			memcpy(&iremote, imsg.data, sizeof(iremote));
2448 			if (iremote.name_len == 0 ||
2449 			    (iremote.fetch_url_len == 0 &&
2450 			    iremote.send_url_len == 0) ||
2451 			    (sizeof(iremote) + iremote.name_len +
2452 			    iremote.fetch_url_len + iremote.send_url_len) >
2453 			    datalen) {
2454 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2455 				break;
2456 			}
2457 			remote->name = strndup(imsg.data + sizeof(iremote),
2458 			    iremote.name_len);
2459 			if (remote->name == NULL) {
2460 				err = got_error_from_errno("strndup");
2461 				break;
2462 			}
2463 			remote->fetch_url = strndup(imsg.data +
2464 			    sizeof(iremote) + iremote.name_len,
2465 			    iremote.fetch_url_len);
2466 			if (remote->fetch_url == NULL) {
2467 				err = got_error_from_errno("strndup");
2468 				free_remote_data(remote);
2469 				break;
2470 			}
2471 			remote->send_url = strndup(imsg.data +
2472 			    sizeof(iremote) + iremote.name_len +
2473 			    iremote.fetch_url_len, iremote.send_url_len);
2474 			if (remote->send_url == NULL) {
2475 				err = got_error_from_errno("strndup");
2476 				free_remote_data(remote);
2477 				break;
2478 			}
2479 			remote->mirror_references = iremote.mirror_references;
2480 			remote->fetch_all_branches = iremote.fetch_all_branches;
2481 			if (iremote.nfetch_branches > 0) {
2482 				remote->fetch_branches = recallocarray(NULL, 0,
2483 				    iremote.nfetch_branches, sizeof(char *));
2484 				if (remote->fetch_branches == NULL) {
2485 					err = got_error_from_errno("calloc");
2486 					free_remote_data(remote);
2487 					break;
2488 				}
2489 			}
2490 			remote->nfetch_branches = 0;
2491 			for (i = 0; i < iremote.nfetch_branches; i++) {
2492 				char *branch;
2493 				err = got_privsep_recv_gotconfig_str(&branch,
2494 				    ibuf);
2495 				if (err) {
2496 					free_remote_data(remote);
2497 					goto done;
2498 				}
2499 				remote->fetch_branches[i] = branch;
2500 				remote->nfetch_branches++;
2501 			}
2502 			if (iremote.nsend_branches > 0) {
2503 				remote->send_branches = recallocarray(NULL, 0,
2504 				    iremote.nsend_branches, sizeof(char *));
2505 				if (remote->send_branches == NULL) {
2506 					err = got_error_from_errno("calloc");
2507 					free_remote_data(remote);
2508 					break;
2509 				}
2510 			}
2511 			remote->nsend_branches = 0;
2512 			for (i = 0; i < iremote.nsend_branches; i++) {
2513 				char *branch;
2514 				err = got_privsep_recv_gotconfig_str(&branch,
2515 				    ibuf);
2516 				if (err) {
2517 					free_remote_data(remote);
2518 					goto done;
2519 				}
2520 				remote->send_branches[i] = branch;
2521 				remote->nsend_branches++;
2522 			}
2523 			if (iremote.nfetch_refs > 0) {
2524 				remote->fetch_refs = recallocarray(NULL, 0,
2525 				    iremote.nfetch_refs, sizeof(char *));
2526 				if (remote->fetch_refs == NULL) {
2527 					err = got_error_from_errno("calloc");
2528 					free_remote_data(remote);
2529 					break;
2530 				}
2531 			}
2532 			remote->nfetch_refs = 0;
2533 			for (i = 0; i < iremote.nfetch_refs; i++) {
2534 				char *ref;
2535 				err = got_privsep_recv_gotconfig_str(&ref,
2536 				    ibuf);
2537 				if (err) {
2538 					free_remote_data(remote);
2539 					goto done;
2540 				}
2541 				remote->fetch_refs[i] = ref;
2542 				remote->nfetch_refs++;
2543 			}
2544 			(*nremotes)++;
2545 			break;
2546 		default:
2547 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2548 			break;
2549 		}
2550 
2551 		imsg_free(&imsg);
2552 		if (err)
2553 			break;
2554 	}
2555 done:
2556 	if (err) {
2557 		int i;
2558 		for (i = 0; i < *nremotes; i++)
2559 			free_remote_data(&(*remotes)[i]);
2560 		free(*remotes);
2561 		*remotes = NULL;
2562 		*nremotes = 0;
2563 	}
2564 	return err;
2565 }
2566 
2567 const struct got_error *
2568 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2569     struct got_object_id *id, int idx, const char *path)
2570 {
2571 	struct ibuf *wbuf;
2572 	size_t path_len = strlen(path) + 1;
2573 
2574 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2575 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2576 	if (wbuf == NULL)
2577 		return got_error_from_errno(
2578 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2579 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2580 		return got_error_from_errno("imsg_add "
2581 		    "COMMIT_TRAVERSAL_REQUEST");
2582 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2583 		return got_error_from_errno("imsg_add "
2584 		    "COMMIT_TRAVERSAL_REQUEST");
2585 	if (imsg_add(wbuf, path, path_len) == -1)
2586 		return got_error_from_errno("imsg_add "
2587 		    "COMMIT_TRAVERSAL_REQUEST");
2588 
2589 	wbuf->fd = -1;
2590 	imsg_close(ibuf, wbuf);
2591 
2592 	return flush_imsg(ibuf);
2593 }
2594 
2595 const struct got_error *
2596 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2597     struct got_object_id **changed_commit_id,
2598     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2599 {
2600 	const struct got_error *err = NULL;
2601 	struct imsg imsg;
2602 	struct got_imsg_traversed_commits *icommits;
2603 	size_t datalen;
2604 	int i, done = 0;
2605 
2606 	*changed_commit = NULL;
2607 	*changed_commit_id = NULL;
2608 
2609 	while (!done) {
2610 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2611 		if (err)
2612 			return err;
2613 
2614 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2615 		switch (imsg.hdr.type) {
2616 		case GOT_IMSG_TRAVERSED_COMMITS:
2617 			icommits = imsg.data;
2618 			if (datalen != sizeof(*icommits) +
2619 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2620 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2621 				break;
2622 			}
2623 			for (i = 0; i < icommits->ncommits; i++) {
2624 				struct got_object_qid *qid;
2625 				uint8_t *sha1 = (uint8_t *)imsg.data +
2626 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2627 				err = got_object_qid_alloc_partial(&qid);
2628 				if (err)
2629 					break;
2630 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2631 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2632 
2633 				/* The last commit may contain a change. */
2634 				if (i == icommits->ncommits - 1) {
2635 					*changed_commit_id =
2636 					    got_object_id_dup(&qid->id);
2637 					if (*changed_commit_id == NULL) {
2638 						err = got_error_from_errno(
2639 						    "got_object_id_dup");
2640 						break;
2641 					}
2642 				}
2643 			}
2644 			break;
2645 		case GOT_IMSG_COMMIT:
2646 			if (*changed_commit_id == NULL) {
2647 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2648 				break;
2649 			}
2650 			err = get_commit_from_imsg(changed_commit, &imsg,
2651 			    datalen, ibuf);
2652 			break;
2653 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2654 			done = 1;
2655 			break;
2656 		default:
2657 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2658 			break;
2659 		}
2660 
2661 		imsg_free(&imsg);
2662 		if (err)
2663 			break;
2664 	}
2665 
2666 	if (err)
2667 		got_object_id_queue_free(commit_ids);
2668 	return err;
2669 }
2670 
2671 const struct got_error *
2672 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2673     struct got_object_id *tree_id, const char *path,
2674     struct got_parsed_tree_entry *entries, int nentries)
2675 {
2676 	const struct got_error *err = NULL;
2677 	struct ibuf *wbuf;
2678 	size_t path_len = strlen(path);
2679 	size_t msglen;
2680 
2681 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2682 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2683 	if (wbuf == NULL)
2684 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2685 
2686 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2687 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2688 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2689 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2690 	if (imsg_add(wbuf, path, path_len) == -1)
2691 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2692 
2693 	wbuf->fd = -1;
2694 	imsg_close(ibuf, wbuf);
2695 
2696 	if (entries) {
2697 		err = send_tree_entries(ibuf, entries, nentries);
2698 		if (err)
2699 			return err;
2700 	}
2701 
2702 	return flush_imsg(ibuf);
2703 }
2704 
2705 const struct got_error *
2706 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2707 {
2708 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2709 	    0, 0, -1, NULL, 0) == -1)
2710 		return got_error_from_errno("imsg_compose "
2711 		    "OBJECT_ENUMERATION_REQUEST");
2712 
2713 	return flush_imsg(ibuf);
2714 }
2715 
2716 const struct got_error *
2717 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2718 {
2719 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2720 	    0, 0, -1, NULL, 0) == -1)
2721 		return got_error_from_errno("imsg_compose "
2722 		    "OBJECT_ENUMERATION_DONE");
2723 
2724 	return flush_imsg(ibuf);
2725 }
2726 
2727 const struct got_error *
2728 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2729 {
2730 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2731 	    0, 0, -1, NULL, 0) == -1)
2732 		return got_error_from_errno("imsg_compose "
2733 		    "OBJECT_ENUMERATION_INCOMPLETE");
2734 
2735 	return flush_imsg(ibuf);
2736 }
2737 
2738 const struct got_error *
2739 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2740     struct got_object_id *id, time_t mtime)
2741 {
2742 	struct ibuf *wbuf;
2743 
2744 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2745 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2746 	if (wbuf == NULL)
2747 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2748 
2749 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2750 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2751 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2752 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2753 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2754 
2755 	wbuf->fd = -1;
2756 	imsg_close(ibuf, wbuf);
2757 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2758 	return NULL;
2759 }
2760 
2761 const struct got_error *
2762 got_privsep_recv_enumerated_objects(int *found_all_objects,
2763     struct imsgbuf *ibuf,
2764     got_object_enumerate_commit_cb cb_commit,
2765     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2766     struct got_repository *repo)
2767 {
2768 	const struct got_error *err = NULL;
2769 	struct imsg imsg;
2770 	struct got_imsg_enumerated_commit *icommit = NULL;
2771 	struct got_object_id commit_id;
2772 	int have_commit = 0;
2773 	time_t mtime = 0;
2774 	struct got_tree_object tree;
2775 	struct got_imsg_enumerated_tree *itree;
2776 	struct got_object_id tree_id;
2777 	char *path = NULL, *canon_path = NULL;
2778 	size_t datalen, path_len;
2779 	int nentries = -1;
2780 	int done = 0;
2781 
2782 	*found_all_objects = 0;
2783 	memset(&tree, 0, sizeof(tree));
2784 
2785 	while (!done) {
2786 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2787 		if (err)
2788 			break;
2789 
2790 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2791 		switch (imsg.hdr.type) {
2792 		case GOT_IMSG_ENUMERATED_COMMIT:
2793 			if (have_commit && nentries != -1) {
2794 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2795 				break;
2796 			}
2797 			if (datalen != sizeof(*icommit)) {
2798 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2799 				break;
2800 			}
2801 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2802 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2803 			mtime = icommit->mtime;
2804 			have_commit = 1;
2805 			break;
2806 		case GOT_IMSG_ENUMERATED_TREE:
2807 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2808 			if (!have_commit) {
2809 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2810 				break;
2811 			}
2812 			if (datalen < sizeof(*itree)) {
2813 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2814 				break;
2815 			}
2816 			itree = imsg.data;
2817 			path_len = datalen - sizeof(*itree);
2818 			if (path_len == 0) {
2819 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2820 				break;
2821 			}
2822 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2823 			free(path);
2824 			path = strndup(imsg.data + sizeof(*itree), path_len);
2825 			if (path == NULL) {
2826 				err = got_error_from_errno("strndup");
2827 				break;
2828 			}
2829 			free(canon_path);
2830 			canon_path = malloc(path_len + 1);
2831 			if (canon_path == NULL) {
2832 				err = got_error_from_errno("malloc");
2833 				break;
2834 			}
2835 			if (!got_path_is_absolute(path)) {
2836 				err = got_error(GOT_ERR_BAD_PATH);
2837 				break;
2838 			}
2839 			if (got_path_is_root_dir(path)) {
2840 				/* XXX check what got_canonpath() does wrong */
2841 				canon_path[0] = '/';
2842 				canon_path[1] = '\0';
2843 			} else {
2844 				err = got_canonpath(path, canon_path,
2845 				    path_len + 1);
2846 				if (err)
2847 					break;
2848 			}
2849 			if (strcmp(path, canon_path) != 0) {
2850 				err = got_error(GOT_ERR_BAD_PATH);
2851 				break;
2852 			}
2853 			if (nentries != -1) {
2854 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2855 				break;
2856 			}
2857 			if (itree->nentries < -1) {
2858 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2859 				break;
2860 			}
2861 			if (itree->nentries == -1) {
2862 				/* Tree was not found in pack file. */
2863 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2864 				    path, repo);
2865 				break;
2866 			}
2867 			if (itree->nentries > INT_MAX) {
2868 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2869 				break;
2870 			}
2871 			tree.entries = calloc(itree->nentries,
2872 			    sizeof(struct got_tree_entry));
2873 			if (tree.entries == NULL) {
2874 				err = got_error_from_errno("calloc");
2875 				break;
2876 			}
2877 			if (itree->nentries == 0) {
2878 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2879 				    path, repo);
2880 				if (err)
2881 					break;
2882 
2883 				/* Prepare for next tree. */
2884 				free(tree.entries);
2885 				memset(&tree, 0, sizeof(tree));
2886 				nentries = -1;
2887 			} else {
2888 				tree.nentries = itree->nentries;
2889 				nentries = 0;
2890 			}
2891 			break;
2892 		case GOT_IMSG_TREE_ENTRIES:
2893 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2894 			if (nentries <= -1) {
2895 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2896 				break;
2897 			}
2898 			err = recv_tree_entries(imsg.data, datalen,
2899 			    &tree, &nentries);
2900 			if (err)
2901 				break;
2902 			if (tree.nentries == nentries) {
2903 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2904 				    path, repo);
2905 				if (err)
2906 					break;
2907 
2908 				/* Prepare for next tree. */
2909 				free(tree.entries);
2910 				memset(&tree, 0, sizeof(tree));
2911 				nentries = -1;
2912 			}
2913 			break;
2914 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2915 			/* All trees have been found and traversed. */
2916 			if (!have_commit || path == NULL || nentries != -1) {
2917 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2918 				break;
2919 			}
2920 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
2921 			if (err)
2922 				break;
2923 			have_commit = 0;
2924 			break;
2925 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
2926 			*found_all_objects = 1;
2927 			done = 1;
2928 			break;
2929 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
2930 			done = 1;
2931 			break;
2932 		default:
2933 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2934 			break;
2935 		}
2936 
2937 		imsg_free(&imsg);
2938 		if (err)
2939 			break;
2940 	}
2941 
2942 	free(path);
2943 	free(canon_path);
2944 	free(tree.entries);
2945 	return err;
2946 }
2947 
2948 const struct got_error *
2949 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2950     struct got_object_id *id)
2951 {
2952 	struct got_imsg_raw_delta_request dreq;
2953 
2954 	memset(&dreq, 0, sizeof(dreq));
2955 	dreq.idx = idx;
2956 	memcpy(&dreq.id, id, sizeof(dreq.id));
2957 
2958 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
2959 	    &dreq, sizeof(dreq)) == -1)
2960 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
2961 
2962 	return flush_imsg(ibuf);
2963 }
2964 
2965 const struct got_error *
2966 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
2967 {
2968 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
2969 }
2970 
2971 const struct got_error *
2972 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
2973     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
2974     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
2975 {
2976 	struct got_imsg_raw_delta idelta;
2977 	int ret;
2978 
2979 	memset(&idelta, 0, sizeof(idelta));
2980 	idelta.base_size = base_size;
2981 	idelta.result_size = result_size;
2982 	idelta.delta_size = delta_size;
2983 	idelta.delta_compressed_size = delta_compressed_size;
2984 	idelta.delta_offset = delta_offset;
2985 	idelta.delta_out_offset = delta_out_offset;
2986 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
2987 
2988 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
2989 	    &idelta, sizeof(idelta));
2990 	if (ret == -1)
2991 		return got_error_from_errno("imsg_compose RAW_DELTA");
2992 
2993 	return flush_imsg(ibuf);
2994 }
2995 
2996 const struct got_error *
2997 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
2998     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
2999     off_t *delta_out_offset, struct got_object_id **base_id,
3000     struct imsgbuf *ibuf)
3001 {
3002 	const struct got_error *err = NULL;
3003 	struct imsg imsg;
3004 	struct got_imsg_raw_delta *delta;
3005 	size_t datalen;
3006 
3007 	*base_size = 0;
3008 	*result_size = 0;
3009 	*delta_size = 0;
3010 	*delta_compressed_size = 0;
3011 	*delta_offset = 0;
3012 	*delta_out_offset = 0;
3013 	*base_id = NULL;
3014 
3015 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3016 	if (err)
3017 		return err;
3018 
3019 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3020 
3021 	switch (imsg.hdr.type) {
3022 	case GOT_IMSG_RAW_DELTA:
3023 		if (datalen != sizeof(*delta)) {
3024 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3025 			break;
3026 		}
3027 		delta = imsg.data;
3028 		*base_size = delta->base_size;
3029 		*result_size = delta->result_size;
3030 		*delta_size = delta->delta_size;
3031 		*delta_compressed_size = delta->delta_compressed_size;
3032 		*delta_offset = delta->delta_offset;
3033 		*delta_out_offset = delta->delta_out_offset;
3034 		*base_id = calloc(1, sizeof(**base_id));
3035 		if (*base_id == NULL) {
3036 			err = got_error_from_errno("malloc");
3037 			break;
3038 		}
3039 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3040 		break;
3041 	default:
3042 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3043 		break;
3044 	}
3045 
3046 	imsg_free(&imsg);
3047 
3048 	if (err) {
3049 		free(*base_id);
3050 		*base_id = NULL;
3051 	}
3052 	return err;
3053 }
3054 
3055 static const struct got_error *
3056 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3057 {
3058 	const struct got_error *err = NULL;
3059 	struct got_imsg_object_idlist idlist;
3060 	struct ibuf *wbuf;
3061 	size_t i;
3062 
3063 	memset(&idlist, 0, sizeof(idlist));
3064 
3065 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3066 		return got_error(GOT_ERR_NO_SPACE);
3067 
3068 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3069 	    sizeof(idlist) + nids * sizeof(**ids));
3070 	if (wbuf == NULL) {
3071 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3072 		return err;
3073 	}
3074 
3075 	idlist.nids = nids;
3076 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3077 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3078 
3079 	for (i = 0; i < nids; i++) {
3080 		struct got_object_id *id = ids[i];
3081 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3082 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3083 	}
3084 
3085 	wbuf->fd = -1;
3086 	imsg_close(ibuf, wbuf);
3087 
3088 	return flush_imsg(ibuf);
3089 }
3090 
3091 const struct got_error *
3092 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3093     struct got_object_id **ids, size_t nids)
3094 {
3095 	const struct got_error *err = NULL;
3096 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3097 	int i, queued = 0;
3098 
3099 	for (i = 0; i < nids; i++) {
3100 		idlist[i % nitems(idlist)] = ids[i];
3101 		queued++;
3102 		if (queued >= nitems(idlist)) {
3103 			err = send_idlist(ibuf, idlist, queued);
3104 			if (err)
3105 				return err;
3106 			queued = 0;
3107 		}
3108 	}
3109 
3110 	if (queued > 0) {
3111 		err = send_idlist(ibuf, idlist, queued);
3112 		if (err)
3113 			return err;
3114 	}
3115 
3116 	return NULL;
3117 }
3118 
3119 const struct got_error *
3120 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3121 {
3122 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3123 	    == -1)
3124 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3125 
3126 	return flush_imsg(ibuf);
3127 }
3128 
3129 const struct got_error *
3130 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3131     size_t *nids, struct imsgbuf *ibuf)
3132 {
3133 	const struct got_error *err = NULL;
3134 	struct imsg imsg;
3135 	struct got_imsg_object_idlist *idlist;
3136 	size_t datalen;
3137 
3138 	*ids = NULL;
3139 	*done = 0;
3140 	*nids = 0;
3141 
3142 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3143 	if (err)
3144 		return err;
3145 
3146 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3147 	switch (imsg.hdr.type) {
3148 	case GOT_IMSG_OBJ_ID_LIST:
3149 		if (datalen < sizeof(*idlist)) {
3150 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3151 			break;
3152 		}
3153 		idlist = imsg.data;
3154 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3155 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3156 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3157 			break;
3158 		}
3159 		*nids = idlist->nids;
3160 		*ids = calloc(*nids, sizeof(**ids));
3161 		if (*ids == NULL) {
3162 			err = got_error_from_errno("calloc");
3163 			break;
3164 		}
3165 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3166 		    *nids * sizeof(**ids));
3167 		break;
3168 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3169 		*done = 1;
3170 		break;
3171 	default:
3172 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3173 		break;
3174 	}
3175 
3176 	imsg_free(&imsg);
3177 
3178 	return err;
3179 }
3180 
3181 const struct got_error *
3182 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3183 {
3184 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3185 	    == -1)
3186 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3187 
3188 	return flush_imsg(ibuf);
3189 }
3190 
3191 const struct got_error *
3192 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3193     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3194 {
3195 	const struct got_error *err = NULL;
3196 	struct ibuf *wbuf;
3197 	struct got_imsg_reused_deltas ideltas;
3198 	size_t i;
3199 
3200 	memset(&ideltas, 0, sizeof(ideltas));
3201 
3202 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3203 		return got_error(GOT_ERR_NO_SPACE);
3204 
3205 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3206 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3207 	if (wbuf == NULL) {
3208 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3209 		return err;
3210 	}
3211 
3212 	ideltas.ndeltas = ndeltas;
3213 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3214 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3215 
3216 	for (i = 0; i < ndeltas; i++) {
3217 		struct got_imsg_reused_delta *delta = &deltas[i];
3218 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3219 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3220 	}
3221 
3222 	wbuf->fd = -1;
3223 	imsg_close(ibuf, wbuf);
3224 
3225 	return flush_imsg(ibuf);
3226 }
3227 
3228 const struct got_error *
3229 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3230 {
3231 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3232 	    == -1)
3233 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3234 
3235 	return flush_imsg(ibuf);
3236 }
3237 
3238 const struct got_error *
3239 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3240     size_t *ndeltas, struct imsgbuf *ibuf)
3241 {
3242 	const struct got_error *err = NULL;
3243 	struct imsg imsg;
3244 	struct got_imsg_reused_deltas *ideltas;
3245 	size_t datalen;
3246 
3247 	*done = 0;
3248 	*ndeltas = 0;
3249 
3250 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3251 	if (err)
3252 		return err;
3253 
3254 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3255 	switch (imsg.hdr.type) {
3256 	case GOT_IMSG_REUSED_DELTAS:
3257 		if (datalen < sizeof(*ideltas)) {
3258 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3259 			break;
3260 		}
3261 		ideltas = imsg.data;
3262 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3263 		    ideltas->ndeltas * sizeof(*deltas) >
3264 		    datalen - sizeof(*ideltas)) {
3265 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3266 			break;
3267 		}
3268 		*ndeltas = ideltas->ndeltas;
3269 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3270 		    *ndeltas * sizeof(*deltas));
3271 		break;
3272 	case GOT_IMSG_DELTA_REUSE_DONE:
3273 		*done = 1;
3274 		break;
3275 	default:
3276 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3277 		break;
3278 	}
3279 
3280 	imsg_free(&imsg);
3281 
3282 	return err;
3283 }
3284 
3285 const struct got_error *
3286 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3287 {
3288 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3289 	    0, 0, -1, NULL, 0)
3290 	    == -1)
3291 		return got_error_from_errno("imsg_compose "
3292 		    "COMMIT_PAINTING_INIT");
3293 
3294 	return flush_imsg(ibuf);
3295 }
3296 
3297 const struct got_error *
3298 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3299     struct got_object_id *id, intptr_t color)
3300 {
3301 	struct got_imsg_commit_painting_request ireq;
3302 
3303 	memset(&ireq, 0, sizeof(ireq));
3304 	memcpy(ireq.id, id->sha1, sizeof(ireq.id));
3305 	ireq.idx = idx;
3306 	ireq.color = color;
3307 
3308 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3309 	    &ireq, sizeof(ireq)) == -1)
3310 		return got_error_from_errno("imsg_compose "
3311 		    "COMMIT_PAINTING_REQUEST");
3312 
3313 	return flush_imsg(ibuf);
3314 }
3315 
3316 static const struct got_error *
3317 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3318     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3319 {
3320 	const struct got_error *err = NULL;
3321 	struct ibuf *wbuf = NULL;
3322 	struct got_object_qid *qid;
3323 	size_t msglen;
3324 	int ncommits;
3325 	intptr_t color;
3326 
3327 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3328 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3329 	    sizeof(struct got_imsg_painted_commit);
3330 
3331 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3332 	if (wbuf == NULL) {
3333 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3334 		return err;
3335 	}
3336 
3337 	/* Keep in sync with struct got_imsg_painted_commits! */
3338 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3339 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3340 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3341 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3342 
3343 	while (ncommits > 0) {
3344 		qid = STAILQ_FIRST(ids);
3345 		STAILQ_REMOVE_HEAD(ids, entry);
3346 		ncommits--;
3347 		(*nids)--;
3348 		color = (intptr_t)qid->data;
3349 
3350 		/* Keep in sync with struct got_imsg_painted_commit! */
3351 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3352 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3353 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3354 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3355 
3356 		got_object_qid_free(qid);
3357 	}
3358 
3359 	wbuf->fd = -1;
3360 	imsg_close(ibuf, wbuf);
3361 
3362 	return flush_imsg(ibuf);
3363 }
3364 
3365 const struct got_error *
3366 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3367     struct got_object_id_queue *ids, int *nids,
3368     int present_in_pack, int flush)
3369 {
3370 	const struct got_error *err;
3371 	size_t remain;
3372 
3373 	if (*nids <= 0)
3374 		return NULL;
3375 
3376 	do {
3377 		remain = (sizeof(struct got_imsg_painted_commits)) +
3378 		    *nids * sizeof(struct got_imsg_painted_commit);
3379 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3380 			err = send_painted_commits(ids, nids, remain,
3381 			    present_in_pack, ibuf);
3382 			if (err)
3383 				return err;
3384 		}
3385 	} while (flush && *nids > 0);
3386 
3387 	return NULL;
3388 }
3389 
3390 const struct got_error *
3391 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3392 {
3393 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3394 	    0, 0, -1, NULL, 0)
3395 	    == -1)
3396 		return got_error_from_errno("imsg_compose "
3397 		    "COMMIT_PAINTING_DONE");
3398 
3399 	return flush_imsg(ibuf);
3400 }
3401 
3402 const struct got_error *
3403 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3404     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3405 {
3406 	const struct got_error *err = NULL;
3407 	struct imsg imsg;
3408 	struct got_imsg_painted_commits icommits;
3409 	struct got_imsg_painted_commit icommit;
3410 	size_t datalen;
3411 	int i;
3412 
3413 	for (;;) {
3414 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3415 		if (err)
3416 			return err;
3417 
3418 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3419 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3420 			break;
3421 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3422 			return got_error(GOT_ERR_PRIVSEP_MSG);
3423 
3424 		if (datalen < sizeof(icommits))
3425 			return got_error(GOT_ERR_PRIVSEP_LEN);
3426 		memcpy(&icommits, imsg.data, sizeof(icommits));
3427 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3428 		    datalen < sizeof(icommits) +
3429 		    icommits.ncommits * sizeof(icommit))
3430 			return got_error(GOT_ERR_PRIVSEP_LEN);
3431 
3432 		for (i = 0; i < icommits.ncommits; i++) {
3433 			memcpy(&icommit,
3434 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3435 			    sizeof(icommit));
3436 
3437 			if (icommits.present_in_pack) {
3438 				struct got_object_id id;
3439 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3440 				err = cb(cb_arg, &id, icommit.color);
3441 				if (err)
3442 					break;
3443 			} else {
3444 				struct got_object_qid *qid;
3445 				err = got_object_qid_alloc_partial(&qid);
3446 				if (err)
3447 					break;
3448 				memcpy(qid->id.sha1, icommit.id,
3449 				    SHA1_DIGEST_LENGTH);
3450 				qid->data = (void *)icommit.color;
3451 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3452 			}
3453 		}
3454 
3455 		imsg_free(&imsg);
3456 	}
3457 
3458 	return err;
3459 }
3460 
3461 const struct got_error *
3462 got_privsep_unveil_exec_helpers(void)
3463 {
3464 	const char *helpers[] = {
3465 	    GOT_PATH_PROG_READ_PACK,
3466 	    GOT_PATH_PROG_READ_OBJECT,
3467 	    GOT_PATH_PROG_READ_COMMIT,
3468 	    GOT_PATH_PROG_READ_TREE,
3469 	    GOT_PATH_PROG_READ_BLOB,
3470 	    GOT_PATH_PROG_READ_TAG,
3471 	    GOT_PATH_PROG_READ_GITCONFIG,
3472 	    GOT_PATH_PROG_READ_GOTCONFIG,
3473 	    GOT_PATH_PROG_READ_PATCH,
3474 	    GOT_PATH_PROG_FETCH_PACK,
3475 	    GOT_PATH_PROG_INDEX_PACK,
3476 	    GOT_PATH_PROG_SEND_PACK,
3477 	};
3478 	size_t i;
3479 
3480 	for (i = 0; i < nitems(helpers); i++) {
3481 		if (unveil(helpers[i], "x") == 0)
3482 			continue;
3483 		return got_error_from_errno2("unveil", helpers[i]);
3484 	}
3485 
3486 	return NULL;
3487 }
3488 
3489 void
3490 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3491 {
3492 	if (close(imsg_fds[0]) == -1) {
3493 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3494 		_exit(1);
3495 	}
3496 
3497 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3498 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3499 		_exit(1);
3500 	}
3501 
3502 	closefrom(GOT_IMSG_FD_CHILD + 1);
3503 
3504 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3505 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3506 		    strerror(errno));
3507 		_exit(1);
3508 	}
3509 }