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