op public repos

Blob

Date:: Thu May 19 07:31:57 2022 UTC
Message:: revert "Skip poll(2) if an imsgbuf has a non-empty read buffer" imsg_read() will call recvmsg() on the file descriptor regardless of the read buffer's state, so we should ensure that data is ready. The read buffer is used by imsg_get(), not imsg_read(). We already call imsg_get() before imsg_read(), and call the latter only if imsg_get() returns zero.
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 #include <time.h>
37 
38 #include "got_object.h"
39 #include "got_error.h"
40 #include "got_path.h"
41 #include "got_repository.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.h"
48 #include "got_lib_privsep.h"
49 #include "got_lib_pack.h"
50 
51 #ifndef MIN
52 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
53 #endif
54 
55 #ifndef nitems
56 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
57 #endif
58 
59 static const struct got_error *
60 poll_fd(int fd, int events, int timeout)
61 {
62 	struct pollfd pfd[1];
63 	struct timespec ts;
64 	sigset_t sigset;
65 	int n;
66 
67 	pfd[0].fd = fd;
68 	pfd[0].events = events;
69 
70 	ts.tv_sec = timeout;
71 	ts.tv_nsec = 0;
72 
73 	if (sigemptyset(&sigset) == -1)
74 		return got_error_from_errno("sigemptyset");
75 	if (sigaddset(&sigset, SIGWINCH) == -1)
76 		return got_error_from_errno("sigaddset");
77 
78 	n = ppoll(pfd, 1, timeout == INFTIM ? NULL : &ts, &sigset);
79 	if (n == -1)
80 		return got_error_from_errno("ppoll");
81 	if (n == 0)
82 		return got_error(GOT_ERR_TIMEOUT);
83 	if (pfd[0].revents & (POLLERR | POLLNVAL))
84 		return got_error_from_errno("poll error");
85 	if (pfd[0].revents & (events | POLLHUP))
86 		return NULL;
87 
88 	return got_error(GOT_ERR_INTERRUPT);
89 }
90 
91 static const struct got_error *
92 read_imsg(struct imsgbuf *ibuf)
93 {
94 	const struct got_error *err;
95 	size_t n;
96 
97 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
98 	if (err)
99 		return err;
100 
101 	n = imsg_read(ibuf);
102 	if (n == -1) {
103 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
104 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
105 		return got_error(GOT_ERR_PRIVSEP_READ);
106 	}
107 	if (n == 0)
108 		return got_error(GOT_ERR_PRIVSEP_PIPE);
109 
110 	return NULL;
111 }
112 
113 const struct got_error *
114 got_privsep_wait_for_child(pid_t pid)
115 {
116 	int child_status;
117 
118 	if (waitpid(pid, &child_status, 0) == -1)
119 		return got_error_from_errno("waitpid");
120 
121 	if (!WIFEXITED(child_status))
122 		return got_error(GOT_ERR_PRIVSEP_DIED);
123 
124 	if (WEXITSTATUS(child_status) != 0)
125 		return got_error(GOT_ERR_PRIVSEP_EXIT);
126 
127 	return NULL;
128 }
129 
130 static const struct got_error *
131 recv_imsg_error(struct imsg *imsg, size_t datalen)
132 {
133 	struct got_imsg_error *ierr;
134 
135 	if (datalen != sizeof(*ierr))
136 		return got_error(GOT_ERR_PRIVSEP_LEN);
137 
138 	ierr = imsg->data;
139 	if (ierr->code == GOT_ERR_ERRNO) {
140 		static struct got_error serr;
141 		serr.code = GOT_ERR_ERRNO;
142 		serr.msg = strerror(ierr->errno_code);
143 		return &serr;
144 	}
145 
146 	return got_error(ierr->code);
147 }
148 
149 const struct got_error *
150 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
151     size_t min_datalen)
152 {
153 	const struct got_error *err;
154 	ssize_t n;
155 
156 	n = imsg_get(ibuf, imsg);
157 	if (n == -1)
158 		return got_error_from_errno("imsg_get");
159 
160 	while (n == 0) {
161 		err = read_imsg(ibuf);
162 		if (err)
163 			return err;
164 		n = imsg_get(ibuf, imsg);
165 		if (n == -1)
166 			return got_error_from_errno("imsg_get");
167 	}
168 
169 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
170 		return got_error(GOT_ERR_PRIVSEP_LEN);
171 
172 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
173 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
174 		return recv_imsg_error(imsg, datalen);
175 	}
176 
177 	return NULL;
178 }
179 
180 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
181 void
182 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
183 {
184 	const struct got_error *poll_err;
185 	struct got_imsg_error ierr;
186 	int ret;
187 
188 	ierr.code = err->code;
189 	if (err->code == GOT_ERR_ERRNO)
190 		ierr.errno_code = errno;
191 	else
192 		ierr.errno_code = 0;
193 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
194 	if (ret == -1) {
195 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
196 		    getprogname(), err->code, err->msg, strerror(errno));
197 		return;
198 	}
199 
200 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
201 	if (poll_err) {
202 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
203 		    getprogname(), err->code, err->msg, poll_err->msg);
204 		return;
205 	}
206 
207 	ret = imsg_flush(ibuf);
208 	if (ret == -1) {
209 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
210 		    getprogname(), err->code, err->msg, strerror(errno));
211 		imsg_clear(ibuf);
212 		return;
213 	}
214 }
215 
216 static const struct got_error *
217 flush_imsg(struct imsgbuf *ibuf)
218 {
219 	const struct got_error *err;
220 
221 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
222 	if (err)
223 		return err;
224 
225 	if (imsg_flush(ibuf) == -1) {
226 		imsg_clear(ibuf);
227 		return got_error_from_errno("imsg_flush");
228 	}
229 
230 	return NULL;
231 }
232 
233 const struct got_error *
234 got_privsep_flush_imsg(struct imsgbuf *ibuf)
235 {
236 	return flush_imsg(ibuf);
237 }
238 
239 const struct got_error *
240 got_privsep_send_stop(int fd)
241 {
242 	const struct got_error *err = NULL;
243 	struct imsgbuf ibuf;
244 
245 	imsg_init(&ibuf, fd);
246 
247 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
248 		return got_error_from_errno("imsg_compose STOP");
249 
250 	err = flush_imsg(&ibuf);
251 	return err;
252 }
253 
254 const struct got_error *
255 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
256     struct got_object_id *id)
257 {
258 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
259 	    id, sizeof(*id)) == -1)
260 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
261 
262 	return flush_imsg(ibuf);
263 }
264 
265 const struct got_error *
266 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
267     struct got_object_id *id)
268 {
269 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
270 	    id, sizeof(*id)) == -1)
271 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
272 
273 	return flush_imsg(ibuf);
274 }
275 
276 const struct got_error *
277 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
278 {
279 	const struct got_error *err = NULL;
280 
281 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
282 	    == -1) {
283 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
284 		close(outfd);
285 		return err;
286 	}
287 
288 	return flush_imsg(ibuf);
289 }
290 
291 const struct got_error *
292 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
293     uint8_t *data)
294 {
295 	const struct got_error *err = NULL;
296 	struct got_imsg_raw_obj iobj;
297 	size_t len = sizeof(iobj);
298 	struct ibuf *wbuf;
299 
300 	iobj.hdrlen = hdrlen;
301 	iobj.size = size;
302 
303 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
304 		len += (size_t)size + hdrlen;
305 
306 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
307 	if (wbuf == NULL) {
308 		err = got_error_from_errno("imsg_create RAW_OBJECT");
309 		return err;
310 	}
311 
312 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
313 		return got_error_from_errno("imsg_add RAW_OBJECT");
314 
315 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
316 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
317 			return got_error_from_errno("imsg_add RAW_OBJECT");
318 	}
319 
320 	wbuf->fd = -1;
321 	imsg_close(ibuf, wbuf);
322 
323 	return flush_imsg(ibuf);
324 }
325 
326 const struct got_error *
327 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
328     struct imsgbuf *ibuf)
329 {
330 	const struct got_error *err = NULL;
331 	struct imsg imsg;
332 	struct got_imsg_raw_obj *iobj;
333 	size_t datalen;
334 
335 	*outbuf = NULL;
336 
337 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
338 	if (err)
339 		return err;
340 
341 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
342 
343 	switch (imsg.hdr.type) {
344 	case GOT_IMSG_RAW_OBJECT:
345 		if (datalen < sizeof(*iobj)) {
346 			err = got_error(GOT_ERR_PRIVSEP_LEN);
347 			break;
348 		}
349 		iobj = imsg.data;
350 		*size = iobj->size;
351 		*hdrlen = iobj->hdrlen;
352 
353 		if (datalen == sizeof(*iobj)) {
354 			/* Data has been written to file descriptor. */
355 			break;
356 		}
357 
358 		if (*size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
359 			err = got_error(GOT_ERR_PRIVSEP_LEN);
360 			break;
361 		}
362 
363 		*outbuf = malloc(*size + *hdrlen);
364 		if (*outbuf == NULL) {
365 			err = got_error_from_errno("malloc");
366 			break;
367 		}
368 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
369 		break;
370 	default:
371 		err = got_error(GOT_ERR_PRIVSEP_MSG);
372 		break;
373 	}
374 
375 	imsg_free(&imsg);
376 
377 	return err;
378 }
379 
380 const struct got_error *
381 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
382     struct got_object_id *id, int pack_idx)
383 {
384 	const struct got_error *err = NULL;
385 	struct got_imsg_packed_object iobj;
386 	void *data;
387 	size_t len;
388 
389 	if (pack_idx != -1) { /* commit is packed */
390 		iobj.idx = pack_idx;
391 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
392 		data = &iobj;
393 		len = sizeof(iobj);
394 	} else {
395 		data = id;
396 		len = sizeof(*id);
397 	}
398 
399 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
400 	    == -1) {
401 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
402 		close(fd);
403 		return err;
404 	}
405 
406 	return flush_imsg(ibuf);
407 }
408 
409 const struct got_error *
410 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
411     struct got_object_id *id, int pack_idx)
412 {
413 	struct ibuf *wbuf;
414 	size_t len;
415 
416 	if (pack_idx != -1)
417 		len = sizeof(struct got_imsg_packed_object);
418 	else
419 		len = sizeof(*id);
420 
421 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
422 	if (wbuf == NULL)
423 		return got_error_from_errno("imsg_create TREE_REQUEST");
424 
425 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
426 		return got_error_from_errno("imsg_add TREE_REQUEST");
427 
428 	if (pack_idx != -1) { /* tree is packed */
429 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
430 			return got_error_from_errno("imsg_add TREE_REQUEST");
431 	}
432 
433 	wbuf->fd = fd;
434 	imsg_close(ibuf, wbuf);
435 
436 	return flush_imsg(ibuf);
437 }
438 
439 const struct got_error *
440 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
441     struct got_object_id *id, int pack_idx)
442 {
443 	struct got_imsg_packed_object iobj;
444 	void *data;
445 	size_t len;
446 
447 	if (pack_idx != -1) { /* tag is packed */
448 		iobj.idx = pack_idx;
449 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
450 		data = &iobj;
451 		len = sizeof(iobj);
452 	} else {
453 		data = id;
454 		len = sizeof(*id);
455 	}
456 
457 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
458 	    == -1)
459 		return got_error_from_errno("imsg_compose TAG_REQUEST");
460 
461 	return flush_imsg(ibuf);
462 }
463 
464 const struct got_error *
465 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
466     struct got_object_id *id, int pack_idx)
467 {
468 	const struct got_error *err = NULL;
469 	struct got_imsg_packed_object iobj;
470 	void *data;
471 	size_t len;
472 
473 	if (pack_idx != -1) { /* blob is packed */
474 		iobj.idx = pack_idx;
475 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
476 		data = &iobj;
477 		len = sizeof(iobj);
478 	} else {
479 		data = id;
480 		len = sizeof(*id);
481 	}
482 
483 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
484 	    == -1) {
485 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
486 		close(infd);
487 		return err;
488 	}
489 
490 	return flush_imsg(ibuf);
491 }
492 
493 const struct got_error *
494 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
495 {
496 	const struct got_error *err = NULL;
497 
498 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
499 	    == -1) {
500 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
501 		close(outfd);
502 		return err;
503 	}
504 
505 	return flush_imsg(ibuf);
506 }
507 
508 static const struct got_error *
509 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
510 {
511 	const struct got_error *err = NULL;
512 
513 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
514 		err = got_error_from_errno("imsg_compose TMPFD");
515 		close(fd);
516 		return err;
517 	}
518 
519 	return flush_imsg(ibuf);
520 }
521 
522 const struct got_error *
523 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
524 {
525 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
526 }
527 
528 const struct got_error *
529 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
530 {
531 	struct got_imsg_object iobj;
532 
533 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
534 	iobj.type = obj->type;
535 	iobj.flags = obj->flags;
536 	iobj.hdrlen = obj->hdrlen;
537 	iobj.size = obj->size;
538 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
539 		iobj.pack_offset = obj->pack_offset;
540 		iobj.pack_idx = obj->pack_idx;
541 	}
542 
543 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
544 	    == -1)
545 		return got_error_from_errno("imsg_compose OBJECT");
546 
547 	return flush_imsg(ibuf);
548 }
549 
550 const struct got_error *
551 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
552     struct got_pathlist_head *have_refs, int fetch_all_branches,
553     struct got_pathlist_head *wanted_branches,
554     struct got_pathlist_head *wanted_refs, int list_refs_only, int verbosity)
555 {
556 	const struct got_error *err = NULL;
557 	struct ibuf *wbuf;
558 	size_t len;
559 	struct got_pathlist_entry *pe;
560 	struct got_imsg_fetch_request fetchreq;
561 
562 	memset(&fetchreq, 0, sizeof(fetchreq));
563 	fetchreq.fetch_all_branches = fetch_all_branches;
564 	fetchreq.list_refs_only = list_refs_only;
565 	fetchreq.verbosity = verbosity;
566 	TAILQ_FOREACH(pe, have_refs, entry)
567 		fetchreq.n_have_refs++;
568 	TAILQ_FOREACH(pe, wanted_branches, entry)
569 		fetchreq.n_wanted_branches++;
570 	TAILQ_FOREACH(pe, wanted_refs, entry)
571 		fetchreq.n_wanted_refs++;
572 	len = sizeof(struct got_imsg_fetch_request);
573 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
574 		close(fd);
575 		return got_error(GOT_ERR_NO_SPACE);
576 	}
577 
578 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
579 	    &fetchreq, sizeof(fetchreq)) == -1)
580 		return got_error_from_errno(
581 		    "imsg_compose FETCH_SERVER_PROGRESS");
582 
583 	err = flush_imsg(ibuf);
584 	if (err) {
585 		close(fd);
586 		return err;
587 	}
588 	fd = -1;
589 
590 	TAILQ_FOREACH(pe, have_refs, entry) {
591 		const char *name = pe->path;
592 		size_t name_len = pe->path_len;
593 		struct got_object_id *id = pe->data;
594 
595 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
596 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
597 		if (wbuf == NULL)
598 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
599 
600 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
601 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
602 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
603 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
604 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
605 		if (imsg_add(wbuf, name, name_len) == -1)
606 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
607 
608 		wbuf->fd = -1;
609 		imsg_close(ibuf, wbuf);
610 		err = flush_imsg(ibuf);
611 		if (err)
612 			return err;
613 	}
614 
615 	TAILQ_FOREACH(pe, wanted_branches, entry) {
616 		const char *name = pe->path;
617 		size_t name_len = pe->path_len;
618 
619 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
620 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
621 		    len);
622 		if (wbuf == NULL)
623 			return got_error_from_errno(
624 			    "imsg_create FETCH_WANTED_BRANCH");
625 
626 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
627 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
628 			return got_error_from_errno(
629 			    "imsg_add FETCH_WANTED_BRANCH");
630 		if (imsg_add(wbuf, name, name_len) == -1)
631 			return got_error_from_errno(
632 			    "imsg_add FETCH_WANTED_BRANCH");
633 
634 		wbuf->fd = -1;
635 		imsg_close(ibuf, wbuf);
636 		err = flush_imsg(ibuf);
637 		if (err)
638 			return err;
639 	}
640 
641 	TAILQ_FOREACH(pe, wanted_refs, entry) {
642 		const char *name = pe->path;
643 		size_t name_len = pe->path_len;
644 
645 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
646 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
647 		    len);
648 		if (wbuf == NULL)
649 			return got_error_from_errno(
650 			    "imsg_create FETCH_WANTED_REF");
651 
652 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
653 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
654 			return got_error_from_errno(
655 			    "imsg_add FETCH_WANTED_REF");
656 		if (imsg_add(wbuf, name, name_len) == -1)
657 			return got_error_from_errno(
658 			    "imsg_add FETCH_WANTED_REF");
659 
660 		wbuf->fd = -1;
661 		imsg_close(ibuf, wbuf);
662 		err = flush_imsg(ibuf);
663 		if (err)
664 			return err;
665 	}
666 
667 
668 	return NULL;
669 
670 }
671 
672 const struct got_error *
673 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
674 {
675 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
676 }
677 
678 const struct got_error *
679 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
680     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
681     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
682 {
683 	const struct got_error *err = NULL;
684 	struct imsg imsg;
685 	size_t datalen;
686 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
687 	size_t n, remain;
688 	off_t off;
689 	int i;
690 
691 	*done = 0;
692 	*id = NULL;
693 	*refname = NULL;
694 	*server_progress = NULL;
695 	*packfile_size = 0;
696 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
697 
698 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
699 	if (err)
700 		return err;
701 
702 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
703 	switch (imsg.hdr.type) {
704 	case GOT_IMSG_ERROR:
705 		if (datalen < sizeof(struct got_imsg_error)) {
706 			err = got_error(GOT_ERR_PRIVSEP_LEN);
707 			break;
708 		}
709 		err = recv_imsg_error(&imsg, datalen);
710 		break;
711 	case GOT_IMSG_FETCH_SYMREFS:
712 		if (datalen < sizeof(*isymrefs)) {
713 			err = got_error(GOT_ERR_PRIVSEP_LEN);
714 			break;
715 		}
716 		if (isymrefs != NULL) {
717 			err = got_error(GOT_ERR_PRIVSEP_MSG);
718 			break;
719 		}
720 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
721 		off = sizeof(*isymrefs);
722 		remain = datalen - off;
723 		for (n = 0; n < isymrefs->nsymrefs; n++) {
724 			struct got_imsg_fetch_symref *s;
725 			char *name, *target;
726 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
727 				err = got_error(GOT_ERR_PRIVSEP_LEN);
728 				goto done;
729 			}
730 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
731 			off += sizeof(*s);
732 			remain -= sizeof(*s);
733 			if (remain < s->name_len) {
734 				err = got_error(GOT_ERR_PRIVSEP_LEN);
735 				goto done;
736 			}
737 			name = strndup(imsg.data + off, s->name_len);
738 			if (name == NULL) {
739 				err = got_error_from_errno("strndup");
740 				goto done;
741 			}
742 			off += s->name_len;
743 			remain -= s->name_len;
744 			if (remain < s->target_len) {
745 				err = got_error(GOT_ERR_PRIVSEP_LEN);
746 				free(name);
747 				goto done;
748 			}
749 			target = strndup(imsg.data + off, s->target_len);
750 			if (target == NULL) {
751 				err = got_error_from_errno("strndup");
752 				free(name);
753 				goto done;
754 			}
755 			off += s->target_len;
756 			remain -= s->target_len;
757 			err = got_pathlist_append(symrefs, name, target);
758 			if (err) {
759 				free(name);
760 				free(target);
761 				goto done;
762 			}
763 		}
764 		break;
765 	case GOT_IMSG_FETCH_REF:
766 		if (datalen <= SHA1_DIGEST_LENGTH) {
767 			err = got_error(GOT_ERR_PRIVSEP_MSG);
768 			break;
769 		}
770 		*id = malloc(sizeof(**id));
771 		if (*id == NULL) {
772 			err = got_error_from_errno("malloc");
773 			break;
774 		}
775 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
776 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
777 		    datalen - SHA1_DIGEST_LENGTH);
778 		if (*refname == NULL) {
779 			err = got_error_from_errno("strndup");
780 			break;
781 		}
782 		break;
783 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
784 		if (datalen == 0) {
785 			err = got_error(GOT_ERR_PRIVSEP_LEN);
786 			break;
787 		}
788 		*server_progress = strndup(imsg.data, datalen);
789 		if (*server_progress == NULL) {
790 			err = got_error_from_errno("strndup");
791 			break;
792 		}
793 		for (i = 0; i < datalen; i++) {
794 			if (!isprint((unsigned char)(*server_progress)[i]) &&
795 			    !isspace((unsigned char)(*server_progress)[i])) {
796 				err = got_error(GOT_ERR_PRIVSEP_MSG);
797 				free(*server_progress);
798 				*server_progress = NULL;
799 				goto done;
800 			}
801 		}
802 		break;
803 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
804 		if (datalen < sizeof(*packfile_size)) {
805 			err = got_error(GOT_ERR_PRIVSEP_MSG);
806 			break;
807 		}
808 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
809 		break;
810 	case GOT_IMSG_FETCH_DONE:
811 		if (datalen != SHA1_DIGEST_LENGTH) {
812 			err = got_error(GOT_ERR_PRIVSEP_MSG);
813 			break;
814 		}
815 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
816 		*done = 1;
817 		break;
818 	default:
819 		err = got_error(GOT_ERR_PRIVSEP_MSG);
820 		break;
821 	}
822 done:
823 	if (err) {
824 		free(*id);
825 		*id = NULL;
826 		free(*refname);
827 		*refname = NULL;
828 	}
829 	imsg_free(&imsg);
830 	return err;
831 }
832 
833 static const struct got_error *
834 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
835     int delete, struct imsgbuf *ibuf)
836 {
837 	size_t len;
838 	struct ibuf *wbuf;
839 
840 	len = sizeof(struct got_imsg_send_ref) + name_len;
841 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
842 	if (wbuf == NULL)
843 		return got_error_from_errno("imsg_create SEND_REF");
844 
845 	/* Keep in sync with struct got_imsg_send_ref! */
846 	if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1)
847 		return got_error_from_errno("imsg_add SEND_REF");
848 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
849 		return got_error_from_errno("imsg_add SEND_REF");
850 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
851 		return got_error_from_errno("imsg_add SEND_REF");
852 	if (imsg_add(wbuf, name, name_len) == -1)
853 		return got_error_from_errno("imsg_add SEND_REF");
854 
855 	wbuf->fd = -1;
856 	imsg_close(ibuf, wbuf);
857 	return flush_imsg(ibuf);
858 }
859 
860 const struct got_error *
861 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
862     struct got_pathlist_head *have_refs,
863     struct got_pathlist_head *delete_refs,
864     int verbosity)
865 {
866 	const struct got_error *err = NULL;
867 	struct got_pathlist_entry *pe;
868 	struct got_imsg_send_request sendreq;
869 	struct got_object_id zero_id;
870 
871 	memset(&zero_id, 0, sizeof(zero_id));
872 	memset(&sendreq, 0, sizeof(sendreq));
873 	sendreq.verbosity = verbosity;
874 	TAILQ_FOREACH(pe, have_refs, entry)
875 		sendreq.nrefs++;
876 	TAILQ_FOREACH(pe, delete_refs, entry)
877 		sendreq.nrefs++;
878 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
879 	    &sendreq, sizeof(sendreq)) == -1) {
880 		err = got_error_from_errno(
881 		    "imsg_compose FETCH_SERVER_PROGRESS");
882 		goto done;
883 	}
884 
885 	err = flush_imsg(ibuf);
886 	if (err)
887 		goto done;
888 	fd = -1;
889 
890 	TAILQ_FOREACH(pe, have_refs, entry) {
891 		const char *name = pe->path;
892 		size_t name_len = pe->path_len;
893 		struct got_object_id *id = pe->data;
894 		err = send_send_ref(name, name_len, id, 0, ibuf);
895 		if (err)
896 			goto done;
897 	}
898 
899 	TAILQ_FOREACH(pe, delete_refs, entry) {
900 		const char *name = pe->path;
901 		size_t name_len = pe->path_len;
902 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
903 		if (err)
904 			goto done;
905 	}
906 done:
907 	if (fd != -1 && close(fd) == -1 && err == NULL)
908 		err = got_error_from_errno("close");
909 	return err;
910 
911 }
912 
913 const struct got_error *
914 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
915     struct imsgbuf *ibuf)
916 {
917 	const struct got_error *err = NULL;
918 	struct imsg imsg;
919 	size_t datalen;
920 	int done = 0;
921 	struct got_imsg_send_remote_ref iremote_ref;
922 	struct got_object_id *id = NULL;
923 	char *refname = NULL;
924 	struct got_pathlist_entry *new;
925 
926 	while (!done) {
927 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
928 		if (err)
929 			return err;
930 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
931 		switch (imsg.hdr.type) {
932 		case GOT_IMSG_ERROR:
933 			if (datalen < sizeof(struct got_imsg_error)) {
934 				err = got_error(GOT_ERR_PRIVSEP_LEN);
935 				goto done;
936 			}
937 			err = recv_imsg_error(&imsg, datalen);
938 			goto done;
939 		case GOT_IMSG_SEND_REMOTE_REF:
940 			if (datalen < sizeof(iremote_ref)) {
941 				err = got_error(GOT_ERR_PRIVSEP_MSG);
942 				goto done;
943 			}
944 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
945 			if (datalen != sizeof(iremote_ref) +
946 			    iremote_ref.name_len) {
947 				err = got_error(GOT_ERR_PRIVSEP_MSG);
948 				goto done;
949 			}
950 			id = malloc(sizeof(*id));
951 			if (id == NULL) {
952 				err = got_error_from_errno("malloc");
953 				goto done;
954 			}
955 			memcpy(id->sha1, iremote_ref.id, SHA1_DIGEST_LENGTH);
956 			refname = strndup(imsg.data + sizeof(iremote_ref),
957 			    datalen - sizeof(iremote_ref));
958 			if (refname == NULL) {
959 				err = got_error_from_errno("strndup");
960 				goto done;
961 			}
962 			err = got_pathlist_insert(&new, remote_refs,
963 			    refname, id);
964 			if (err)
965 				goto done;
966 			if (new == NULL) { /* duplicate which wasn't inserted */
967 				free(id);
968 				free(refname);
969 			}
970 			id = NULL;
971 			refname = NULL;
972 			break;
973 		case GOT_IMSG_SEND_PACK_REQUEST:
974 			if (datalen != 0) {
975 				err = got_error(GOT_ERR_PRIVSEP_MSG);
976 				goto done;
977 			}
978 			/* got-send-pack is now waiting for a pack file. */
979 			done = 1;
980 			break;
981 		default:
982 			err = got_error(GOT_ERR_PRIVSEP_MSG);
983 			break;
984 		}
985 	}
986 done:
987 	free(id);
988 	free(refname);
989 	imsg_free(&imsg);
990 	return err;
991 }
992 
993 const struct got_error *
994 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
995 {
996 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
997 }
998 
999 const struct got_error *
1000 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
1001     int *success, char **refname, struct imsgbuf *ibuf)
1002 {
1003 	const struct got_error *err = NULL;
1004 	struct imsg imsg;
1005 	size_t datalen;
1006 	struct got_imsg_send_ref_status iref_status;
1007 
1008 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1009 	*done = 0;
1010 	*success = 0;
1011 	*refname = NULL;
1012 
1013 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1014 	if (err)
1015 		return err;
1016 
1017 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1018 	switch (imsg.hdr.type) {
1019 	case GOT_IMSG_ERROR:
1020 		if (datalen < sizeof(struct got_imsg_error)) {
1021 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1022 			break;
1023 		}
1024 		err = recv_imsg_error(&imsg, datalen);
1025 		break;
1026 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1027 		if (datalen < sizeof(*bytes_sent)) {
1028 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1029 			break;
1030 		}
1031 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1032 		break;
1033 	case GOT_IMSG_SEND_REF_STATUS:
1034 		if (datalen < sizeof(iref_status)) {
1035 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1036 			break;
1037 		}
1038 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1039 		if (datalen != sizeof(iref_status) + iref_status.name_len) {
1040 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1041 			break;
1042 		}
1043 		*success = iref_status.success;
1044 		*refname = strndup(imsg.data + sizeof(iref_status),
1045 		    iref_status.name_len);
1046 		break;
1047 	case GOT_IMSG_SEND_DONE:
1048 		if (datalen != 0) {
1049 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1050 			break;
1051 		}
1052 		*done = 1;
1053 		break;
1054 	default:
1055 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1056 		break;
1057 	}
1058 
1059 	imsg_free(&imsg);
1060 	return err;
1061 }
1062 
1063 const struct got_error *
1064 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1065     int fd)
1066 {
1067 	const struct got_error *err = NULL;
1068 
1069 	/* Keep in sync with struct got_imsg_index_pack_request */
1070 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1071 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1072 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1073 		close(fd);
1074 		return err;
1075 	}
1076 	return flush_imsg(ibuf);
1077 }
1078 
1079 const struct got_error *
1080 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1081 {
1082 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1083 }
1084 
1085 const struct got_error *
1086 got_privsep_recv_index_progress(int *done, int *nobj_total,
1087     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1088     struct imsgbuf *ibuf)
1089 {
1090 	const struct got_error *err = NULL;
1091 	struct imsg imsg;
1092 	struct got_imsg_index_pack_progress *iprogress;
1093 	size_t datalen;
1094 
1095 	*done = 0;
1096 	*nobj_total = 0;
1097 	*nobj_indexed = 0;
1098 	*nobj_resolved = 0;
1099 
1100 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1101 	if (err)
1102 		return err;
1103 
1104 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1105 	switch (imsg.hdr.type) {
1106 	case GOT_IMSG_ERROR:
1107 		if (datalen < sizeof(struct got_imsg_error)) {
1108 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1109 			break;
1110 		}
1111 		err = recv_imsg_error(&imsg, datalen);
1112 		break;
1113 	case GOT_IMSG_IDXPACK_PROGRESS:
1114 		if (datalen < sizeof(*iprogress)) {
1115 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1116 			break;
1117 		}
1118 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1119 		*nobj_total = iprogress->nobj_total;
1120 		*nobj_indexed = iprogress->nobj_indexed;
1121 		*nobj_loose = iprogress->nobj_loose;
1122 		*nobj_resolved = iprogress->nobj_resolved;
1123 		break;
1124 	case GOT_IMSG_IDXPACK_DONE:
1125 		if (datalen != 0) {
1126 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1127 			break;
1128 		}
1129 		*done = 1;
1130 		break;
1131 	default:
1132 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1133 		break;
1134 	}
1135 
1136 	imsg_free(&imsg);
1137 	return err;
1138 }
1139 
1140 const struct got_error *
1141 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1142     struct imsgbuf *ibuf)
1143 {
1144 	struct got_imsg_object *iobj;
1145 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1146 
1147 	if (datalen != sizeof(*iobj))
1148 		return got_error(GOT_ERR_PRIVSEP_LEN);
1149 	iobj = imsg->data;
1150 
1151 	*obj = calloc(1, sizeof(**obj));
1152 	if (*obj == NULL)
1153 		return got_error_from_errno("calloc");
1154 
1155 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
1156 	(*obj)->type = iobj->type;
1157 	(*obj)->flags = iobj->flags;
1158 	(*obj)->hdrlen = iobj->hdrlen;
1159 	(*obj)->size = iobj->size;
1160 	/* path_packfile is handled by caller */
1161 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1162 		(*obj)->pack_offset = iobj->pack_offset;
1163 		(*obj)->pack_idx = iobj->pack_idx;
1164 	}
1165 	STAILQ_INIT(&(*obj)->deltas.entries);
1166 	return NULL;
1167 }
1168 
1169 const struct got_error *
1170 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1171 {
1172 	const struct got_error *err = NULL;
1173 	struct imsg imsg;
1174 	const size_t min_datalen =
1175 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1176 
1177 	*obj = NULL;
1178 
1179 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1180 	if (err)
1181 		return err;
1182 
1183 	switch (imsg.hdr.type) {
1184 	case GOT_IMSG_OBJECT:
1185 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1186 		break;
1187 	default:
1188 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1189 		break;
1190 	}
1191 
1192 	imsg_free(&imsg);
1193 
1194 	return err;
1195 }
1196 
1197 static const struct got_error *
1198 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1199     size_t logmsg_len)
1200 {
1201 	const struct got_error *err = NULL;
1202 	size_t offset, remain;
1203 
1204 	offset = 0;
1205 	remain = logmsg_len;
1206 	while (remain > 0) {
1207 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1208 
1209 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1210 		    commit->logmsg + offset, n) == -1) {
1211 			err = got_error_from_errno("imsg_compose "
1212 			    "COMMIT_LOGMSG");
1213 			break;
1214 		}
1215 
1216 		err = flush_imsg(ibuf);
1217 		if (err)
1218 			break;
1219 
1220 		offset += n;
1221 		remain -= n;
1222 	}
1223 
1224 	return err;
1225 }
1226 
1227 const struct got_error *
1228 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1229 {
1230 	const struct got_error *err = NULL;
1231 	struct got_imsg_commit_object *icommit;
1232 	uint8_t *buf;
1233 	size_t len, total;
1234 	struct got_object_qid *qid;
1235 	size_t author_len = strlen(commit->author);
1236 	size_t committer_len = strlen(commit->committer);
1237 	size_t logmsg_len = strlen(commit->logmsg);
1238 
1239 	total = sizeof(*icommit) + author_len + committer_len +
1240 	    commit->nparents * SHA1_DIGEST_LENGTH;
1241 
1242 	buf = malloc(total);
1243 	if (buf == NULL)
1244 		return got_error_from_errno("malloc");
1245 
1246 	icommit = (struct got_imsg_commit_object *)buf;
1247 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1248 	    sizeof(icommit->tree_id));
1249 	icommit->author_len = author_len;
1250 	icommit->author_time = commit->author_time;
1251 	icommit->author_gmtoff = commit->author_gmtoff;
1252 	icommit->committer_len = committer_len;
1253 	icommit->committer_time = commit->committer_time;
1254 	icommit->committer_gmtoff = commit->committer_gmtoff;
1255 	icommit->logmsg_len = logmsg_len;
1256 	icommit->nparents = commit->nparents;
1257 
1258 	len = sizeof(*icommit);
1259 	memcpy(buf + len, commit->author, author_len);
1260 	len += author_len;
1261 	memcpy(buf + len, commit->committer, committer_len);
1262 	len += committer_len;
1263 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1264 		memcpy(buf + len, &qid->id, SHA1_DIGEST_LENGTH);
1265 		len += SHA1_DIGEST_LENGTH;
1266 	}
1267 
1268 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1269 		err = got_error_from_errno("imsg_compose COMMIT");
1270 		goto done;
1271 	}
1272 
1273 	if (logmsg_len == 0 ||
1274 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1275 		err = flush_imsg(ibuf);
1276 		if (err)
1277 			goto done;
1278 	}
1279 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1280 done:
1281 	free(buf);
1282 	return err;
1283 }
1284 
1285 static const struct got_error *
1286 get_commit_from_imsg(struct got_commit_object **commit,
1287     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1288 {
1289 	const struct got_error *err = NULL;
1290 	struct got_imsg_commit_object *icommit;
1291 	size_t len = 0;
1292 	int i;
1293 
1294 	if (datalen < sizeof(*icommit))
1295 		return got_error(GOT_ERR_PRIVSEP_LEN);
1296 
1297 	icommit = imsg->data;
1298 	if (datalen != sizeof(*icommit) + icommit->author_len +
1299 	    icommit->committer_len +
1300 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1301 		return got_error(GOT_ERR_PRIVSEP_LEN);
1302 
1303 	if (icommit->nparents < 0)
1304 		return got_error(GOT_ERR_PRIVSEP_LEN);
1305 
1306 	len += sizeof(*icommit);
1307 
1308 	*commit = got_object_commit_alloc_partial();
1309 	if (*commit == NULL)
1310 		return got_error_from_errno(
1311 		    "got_object_commit_alloc_partial");
1312 
1313 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1314 	    SHA1_DIGEST_LENGTH);
1315 	(*commit)->author_time = icommit->author_time;
1316 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1317 	(*commit)->committer_time = icommit->committer_time;
1318 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1319 
1320 	if (icommit->author_len == 0) {
1321 		(*commit)->author = strdup("");
1322 		if ((*commit)->author == NULL) {
1323 			err = got_error_from_errno("strdup");
1324 			goto done;
1325 		}
1326 	} else {
1327 		(*commit)->author = malloc(icommit->author_len + 1);
1328 		if ((*commit)->author == NULL) {
1329 			err = got_error_from_errno("malloc");
1330 			goto done;
1331 		}
1332 		memcpy((*commit)->author, imsg->data + len,
1333 		    icommit->author_len);
1334 		(*commit)->author[icommit->author_len] = '\0';
1335 	}
1336 	len += icommit->author_len;
1337 
1338 	if (icommit->committer_len == 0) {
1339 		(*commit)->committer = strdup("");
1340 		if ((*commit)->committer == NULL) {
1341 			err = got_error_from_errno("strdup");
1342 			goto done;
1343 		}
1344 	} else {
1345 		(*commit)->committer =
1346 		    malloc(icommit->committer_len + 1);
1347 		if ((*commit)->committer == NULL) {
1348 			err = got_error_from_errno("malloc");
1349 			goto done;
1350 		}
1351 		memcpy((*commit)->committer, imsg->data + len,
1352 		    icommit->committer_len);
1353 		(*commit)->committer[icommit->committer_len] = '\0';
1354 	}
1355 	len += icommit->committer_len;
1356 
1357 	if (icommit->logmsg_len == 0) {
1358 		(*commit)->logmsg = strdup("");
1359 		if ((*commit)->logmsg == NULL) {
1360 			err = got_error_from_errno("strdup");
1361 			goto done;
1362 		}
1363 	} else {
1364 		size_t offset = 0, remain = icommit->logmsg_len;
1365 
1366 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1367 		if ((*commit)->logmsg == NULL) {
1368 			err = got_error_from_errno("malloc");
1369 			goto done;
1370 		}
1371 		while (remain > 0) {
1372 			struct imsg imsg_log;
1373 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1374 			    remain);
1375 
1376 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1377 			if (err)
1378 				goto done;
1379 
1380 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1381 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1382 				goto done;
1383 			}
1384 
1385 			memcpy((*commit)->logmsg + offset,
1386 			    imsg_log.data, n);
1387 			imsg_free(&imsg_log);
1388 			offset += n;
1389 			remain -= n;
1390 		}
1391 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1392 	}
1393 
1394 	for (i = 0; i < icommit->nparents; i++) {
1395 		struct got_object_qid *qid;
1396 
1397 		err = got_object_qid_alloc_partial(&qid);
1398 		if (err)
1399 			break;
1400 		memcpy(&qid->id, imsg->data + len +
1401 		    i * SHA1_DIGEST_LENGTH, sizeof(qid->id));
1402 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1403 		(*commit)->nparents++;
1404 	}
1405 done:
1406 	if (err) {
1407 		got_object_commit_close(*commit);
1408 		*commit = NULL;
1409 	}
1410 	return err;
1411 }
1412 
1413 const struct got_error *
1414 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1415 {
1416 	const struct got_error *err = NULL;
1417 	struct imsg imsg;
1418 	size_t datalen;
1419 	const size_t min_datalen =
1420 	    MIN(sizeof(struct got_imsg_error),
1421 	    sizeof(struct got_imsg_commit_object));
1422 
1423 	*commit = NULL;
1424 
1425 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1426 	if (err)
1427 		return err;
1428 
1429 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1430 
1431 	switch (imsg.hdr.type) {
1432 	case GOT_IMSG_COMMIT:
1433 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1434 		break;
1435 	default:
1436 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1437 		break;
1438 	}
1439 
1440 	imsg_free(&imsg);
1441 
1442 	return err;
1443 }
1444 
1445 static const struct got_error *
1446 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1447     int idx0, int idxN, size_t len)
1448 {
1449 	struct ibuf *wbuf;
1450 	struct got_imsg_tree_entries ientries;
1451 	int i;
1452 
1453 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1454 	if (wbuf == NULL)
1455 		return got_error_from_errno("imsg_create TREE_ENTRY");
1456 
1457 	ientries.nentries = idxN - idx0 + 1;
1458 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1459 		return got_error_from_errno("imsg_add TREE_ENTRY");
1460 
1461 	for (i = idx0; i <= idxN; i++) {
1462 		struct got_parsed_tree_entry *pte = &entries[i];
1463 
1464 		/* Keep in sync with struct got_imsg_tree_object definition! */
1465 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1466 			return got_error_from_errno("imsg_add TREE_ENTRY");
1467 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1468 			return got_error_from_errno("imsg_add TREE_ENTRY");
1469 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1470 			return got_error_from_errno("imsg_add TREE_ENTRY");
1471 		
1472 		/* Remaining bytes are the entry's name. */
1473 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1474 			return got_error_from_errno("imsg_add TREE_ENTRY");
1475 	}
1476 
1477 	wbuf->fd = -1;
1478 	imsg_close(ibuf, wbuf);
1479 	return NULL;
1480 }
1481 
1482 const struct got_error *
1483 got_privsep_send_tree(struct imsgbuf *ibuf,
1484     struct got_parsed_tree_entry *entries, int nentries)
1485 {
1486 	const struct got_error *err = NULL;
1487 	struct got_imsg_tree_object itree;
1488 	size_t entries_len;
1489 	int i, j;
1490 
1491 	itree.nentries = nentries;
1492 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1493 	    == -1)
1494 		return got_error_from_errno("imsg_compose TREE");
1495 
1496 	entries_len = sizeof(struct got_imsg_tree_entries);
1497 	i = 0;
1498 	for (j = 0; j < nentries; j++) {
1499 		struct got_parsed_tree_entry *pte = &entries[j];
1500 		size_t len = sizeof(*pte) + pte->namelen;
1501 
1502 		if (j > 0 &&
1503 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1504 			err = send_tree_entries(ibuf, entries,
1505 			    i, j - 1, entries_len);
1506 			if (err)
1507 				return err;
1508 			i = j;
1509 			entries_len = sizeof(struct got_imsg_tree_entries);
1510 		}
1511 
1512 		entries_len += len;
1513 	}
1514 
1515 	if (j > 0) {
1516 		err = send_tree_entries(ibuf, entries, i, j - 1, entries_len);
1517 		if (err)
1518 			return err;
1519 	}
1520 
1521 	return flush_imsg(ibuf);
1522 }
1523 
1524 const struct got_error *
1525 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1526 {
1527 	const struct got_error *err = NULL;
1528 	const size_t min_datalen =
1529 	    MIN(sizeof(struct got_imsg_error),
1530 	    sizeof(struct got_imsg_tree_object));
1531 	struct got_imsg_tree_object *itree;
1532 	size_t i;
1533 	int nentries = 0;
1534 
1535 	*tree = NULL;
1536 
1537 	err = read_imsg(ibuf);
1538 	if (err)
1539 		goto done;
1540 
1541 	for (;;) {
1542 		struct imsg imsg;
1543 		size_t n;
1544 		size_t datalen;
1545 		struct got_imsg_tree_entries *ientries;
1546 		struct got_tree_entry *te = NULL;
1547 		size_t te_offset;
1548 
1549 		n = imsg_get(ibuf, &imsg);
1550 		if (n == 0) {
1551 			if ((*tree)) {
1552 				if (nentries < (*tree)->nentries) {
1553 					err = read_imsg(ibuf);
1554 					if (err)
1555 						break;
1556 					continue;
1557 				} else
1558 					break;
1559 			} else {
1560 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1561 				break;
1562 			}
1563 		}
1564 
1565 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen) {
1566 			imsg_free(&imsg);
1567 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1568 			break;
1569 		}
1570 
1571 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1572 
1573 		switch (imsg.hdr.type) {
1574 		case GOT_IMSG_ERROR:
1575 			err = recv_imsg_error(&imsg, datalen);
1576 			break;
1577 		case GOT_IMSG_TREE:
1578 			/* This message should only appear once. */
1579 			if (*tree != NULL) {
1580 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1581 				break;
1582 			}
1583 			if (datalen != sizeof(*itree)) {
1584 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1585 				break;
1586 			}
1587 			itree = imsg.data;
1588 			if (itree->nentries < 0) {
1589 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1590 				break;
1591 			}
1592 			*tree = malloc(sizeof(**tree));
1593 			if (*tree == NULL) {
1594 				err = got_error_from_errno("malloc");
1595 				break;
1596 			}
1597 			(*tree)->entries = calloc(itree->nentries,
1598 			    sizeof(struct got_tree_entry));
1599 			if ((*tree)->entries == NULL) {
1600 				err = got_error_from_errno("malloc");
1601 				free(*tree);
1602 				*tree = NULL;
1603 				break;
1604 			}
1605 			(*tree)->nentries = itree->nentries;
1606 			(*tree)->refcnt = 0;
1607 			break;
1608 		case GOT_IMSG_TREE_ENTRIES:
1609 			/* This message should be preceeded by GOT_IMSG_TREE. */
1610 			if (*tree == NULL) {
1611 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1612 				break;
1613 			}
1614 			if (datalen <= sizeof(*ientries) ||
1615 			    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1616 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1617 				break;
1618 			}
1619 
1620 			ientries = imsg.data;
1621 			if (ientries->nentries > INT_MAX) {
1622 				err = got_error_msg(GOT_ERR_NO_SPACE,
1623 				    "too many tree entries");
1624 				break;
1625 			}
1626 			te_offset = sizeof(*ientries);
1627 			for (i = 0; i < ientries->nentries; i++) {
1628 				struct got_imsg_tree_entry ite;
1629 				const char *te_name;
1630 				uint8_t *buf = imsg.data + te_offset;
1631 
1632 				if (te_offset >= datalen) {
1633 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1634 					break;
1635 				}
1636 
1637 				/* Might not be aligned, size is ~32 bytes. */
1638 				memcpy(&ite, buf, sizeof(ite));
1639 
1640 				if (ite.namelen >= sizeof(te->name)) {
1641 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1642 					break;
1643 				}
1644 				if (te_offset + sizeof(ite) + ite.namelen >
1645 				    datalen) {
1646 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1647 					break;
1648 				}
1649 				if (nentries >= (*tree)->nentries) {
1650 					err = got_error(GOT_ERR_PRIVSEP_LEN);
1651 					break;
1652 				}
1653 				te = &(*tree)->entries[nentries];
1654 				te_name = buf + sizeof(ite);
1655 				memcpy(te->name, te_name, ite.namelen);
1656 				te->name[ite.namelen] = '\0';
1657 				memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1658 				te->mode = ite.mode;
1659 				te->idx = nentries;
1660 				nentries++;
1661 
1662 				te_offset += sizeof(ite) + ite.namelen;
1663 			}
1664 			break;
1665 		default:
1666 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1667 			break;
1668 		}
1669 
1670 		imsg_free(&imsg);
1671 		if (err)
1672 			break;
1673 	}
1674 done:
1675 	if (*tree && (*tree)->nentries != nentries) {
1676 		if (err == NULL)
1677 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1678 		got_object_tree_close(*tree);
1679 		*tree = NULL;
1680 	}
1681 
1682 	return err;
1683 }
1684 
1685 const struct got_error *
1686 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1687     const uint8_t *data)
1688 {
1689 	struct got_imsg_blob iblob;
1690 
1691 	iblob.size = size;
1692 	iblob.hdrlen = hdrlen;
1693 
1694 	if (data) {
1695 		uint8_t *buf;
1696 
1697 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1698 			return got_error(GOT_ERR_NO_SPACE);
1699 
1700 		buf = malloc(sizeof(iblob) + size);
1701 		if (buf == NULL)
1702 			return got_error_from_errno("malloc");
1703 
1704 		memcpy(buf, &iblob, sizeof(iblob));
1705 		memcpy(buf + sizeof(iblob), data, size);
1706 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1707 		    sizeof(iblob) + size) == -1) {
1708 			free(buf);
1709 			return got_error_from_errno("imsg_compose BLOB");
1710 		}
1711 		free(buf);
1712 	} else {
1713 		/* Data has already been written to file descriptor. */
1714 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1715 		    sizeof(iblob)) == -1)
1716 			return got_error_from_errno("imsg_compose BLOB");
1717 	}
1718 
1719 
1720 	return flush_imsg(ibuf);
1721 }
1722 
1723 const struct got_error *
1724 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1725     struct imsgbuf *ibuf)
1726 {
1727 	const struct got_error *err = NULL;
1728 	struct imsg imsg;
1729 	struct got_imsg_blob *iblob;
1730 	size_t datalen;
1731 
1732 	*outbuf = NULL;
1733 
1734 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1735 	if (err)
1736 		return err;
1737 
1738 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1739 
1740 	switch (imsg.hdr.type) {
1741 	case GOT_IMSG_BLOB:
1742 		if (datalen < sizeof(*iblob)) {
1743 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1744 			break;
1745 		}
1746 		iblob = imsg.data;
1747 		*size = iblob->size;
1748 		*hdrlen = iblob->hdrlen;
1749 
1750 		if (datalen == sizeof(*iblob)) {
1751 			/* Data has been written to file descriptor. */
1752 			break;
1753 		}
1754 
1755 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1756 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1757 			break;
1758 		}
1759 
1760 		*outbuf = malloc(*size);
1761 		if (*outbuf == NULL) {
1762 			err = got_error_from_errno("malloc");
1763 			break;
1764 		}
1765 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1766 		break;
1767 	default:
1768 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1769 		break;
1770 	}
1771 
1772 	imsg_free(&imsg);
1773 
1774 	return err;
1775 }
1776 
1777 static const struct got_error *
1778 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1779 {
1780 	const struct got_error *err = NULL;
1781 	size_t offset, remain;
1782 
1783 	offset = 0;
1784 	remain = tagmsg_len;
1785 	while (remain > 0) {
1786 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1787 
1788 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1789 		    tag->tagmsg + offset, n) == -1) {
1790 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1791 			break;
1792 		}
1793 
1794 		err = flush_imsg(ibuf);
1795 		if (err)
1796 			break;
1797 
1798 		offset += n;
1799 		remain -= n;
1800 	}
1801 
1802 	return err;
1803 }
1804 
1805 const struct got_error *
1806 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1807 {
1808 	const struct got_error *err = NULL;
1809 	struct got_imsg_tag_object *itag;
1810 	uint8_t *buf;
1811 	size_t len, total;
1812 	size_t tag_len = strlen(tag->tag);
1813 	size_t tagger_len = strlen(tag->tagger);
1814 	size_t tagmsg_len = strlen(tag->tagmsg);
1815 
1816 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1817 
1818 	buf = malloc(total);
1819 	if (buf == NULL)
1820 		return got_error_from_errno("malloc");
1821 
1822 	itag = (struct got_imsg_tag_object *)buf;
1823 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1824 	itag->obj_type = tag->obj_type;
1825 	itag->tag_len = tag_len;
1826 	itag->tagger_len = tagger_len;
1827 	itag->tagger_time = tag->tagger_time;
1828 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1829 	itag->tagmsg_len = tagmsg_len;
1830 
1831 	len = sizeof(*itag);
1832 	memcpy(buf + len, tag->tag, tag_len);
1833 	len += tag_len;
1834 	memcpy(buf + len, tag->tagger, tagger_len);
1835 	len += tagger_len;
1836 
1837 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1838 		err = got_error_from_errno("imsg_compose TAG");
1839 		goto done;
1840 	}
1841 
1842 	if (tagmsg_len == 0 ||
1843 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1844 		err = flush_imsg(ibuf);
1845 		if (err)
1846 			goto done;
1847 	}
1848 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1849 done:
1850 	free(buf);
1851 	return err;
1852 }
1853 
1854 const struct got_error *
1855 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1856 {
1857 	const struct got_error *err = NULL;
1858 	struct imsg imsg;
1859 	struct got_imsg_tag_object *itag;
1860 	size_t len, datalen;
1861 	const size_t min_datalen =
1862 	    MIN(sizeof(struct got_imsg_error),
1863 	    sizeof(struct got_imsg_tag_object));
1864 
1865 	*tag = NULL;
1866 
1867 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1868 	if (err)
1869 		return err;
1870 
1871 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1872 	len = 0;
1873 
1874 	switch (imsg.hdr.type) {
1875 	case GOT_IMSG_TAG:
1876 		if (datalen < sizeof(*itag)) {
1877 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1878 			break;
1879 		}
1880 		itag = imsg.data;
1881 		if (datalen != sizeof(*itag) + itag->tag_len +
1882 		    itag->tagger_len) {
1883 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1884 			break;
1885 		}
1886 		len += sizeof(*itag);
1887 
1888 		*tag = calloc(1, sizeof(**tag));
1889 		if (*tag == NULL) {
1890 			err = got_error_from_errno("calloc");
1891 			break;
1892 		}
1893 
1894 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1895 
1896 		if (itag->tag_len == 0) {
1897 			(*tag)->tag = strdup("");
1898 			if ((*tag)->tag == NULL) {
1899 				err = got_error_from_errno("strdup");
1900 				break;
1901 			}
1902 		} else {
1903 			(*tag)->tag = malloc(itag->tag_len + 1);
1904 			if ((*tag)->tag == NULL) {
1905 				err = got_error_from_errno("malloc");
1906 				break;
1907 			}
1908 			memcpy((*tag)->tag, imsg.data + len,
1909 			    itag->tag_len);
1910 			(*tag)->tag[itag->tag_len] = '\0';
1911 		}
1912 		len += itag->tag_len;
1913 
1914 		(*tag)->obj_type = itag->obj_type;
1915 		(*tag)->tagger_time = itag->tagger_time;
1916 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1917 
1918 		if (itag->tagger_len == 0) {
1919 			(*tag)->tagger = strdup("");
1920 			if ((*tag)->tagger == NULL) {
1921 				err = got_error_from_errno("strdup");
1922 				break;
1923 			}
1924 		} else {
1925 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1926 			if ((*tag)->tagger == NULL) {
1927 				err = got_error_from_errno("malloc");
1928 				break;
1929 			}
1930 			memcpy((*tag)->tagger, imsg.data + len,
1931 			    itag->tagger_len);
1932 			(*tag)->tagger[itag->tagger_len] = '\0';
1933 		}
1934 		len += itag->tagger_len;
1935 
1936 		if (itag->tagmsg_len == 0) {
1937 			(*tag)->tagmsg = strdup("");
1938 			if ((*tag)->tagmsg == NULL) {
1939 				err = got_error_from_errno("strdup");
1940 				break;
1941 			}
1942 		} else {
1943 			size_t offset = 0, remain = itag->tagmsg_len;
1944 
1945 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1946 			if ((*tag)->tagmsg == NULL) {
1947 				err = got_error_from_errno("malloc");
1948 				break;
1949 			}
1950 			while (remain > 0) {
1951 				struct imsg imsg_log;
1952 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1953 				    remain);
1954 
1955 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1956 				if (err)
1957 					return err;
1958 
1959 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1960 					return got_error(GOT_ERR_PRIVSEP_MSG);
1961 
1962 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1963 				    n);
1964 				imsg_free(&imsg_log);
1965 				offset += n;
1966 				remain -= n;
1967 			}
1968 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1969 		}
1970 
1971 		break;
1972 	default:
1973 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1974 		break;
1975 	}
1976 
1977 	imsg_free(&imsg);
1978 
1979 	return err;
1980 }
1981 
1982 const struct got_error *
1983 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1984     struct got_packidx *packidx)
1985 {
1986 	const struct got_error *err = NULL;
1987 	struct got_imsg_packidx ipackidx;
1988 	struct got_imsg_pack ipack;
1989 	int fd;
1990 
1991 	ipackidx.len = packidx->len;
1992 	ipackidx.packfile_size = pack->filesize;
1993 	fd = dup(packidx->fd);
1994 	if (fd == -1)
1995 		return got_error_from_errno("dup");
1996 
1997 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1998 	    sizeof(ipackidx)) == -1) {
1999 		err = got_error_from_errno("imsg_compose PACKIDX");
2000 		close(fd);
2001 		return err;
2002 	}
2003 
2004 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
2005 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
2006 		return got_error(GOT_ERR_NO_SPACE);
2007 	ipack.filesize = pack->filesize;
2008 
2009 	fd = dup(pack->fd);
2010 	if (fd == -1)
2011 		return got_error_from_errno("dup");
2012 
2013 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
2014 	    == -1) {
2015 		err = got_error_from_errno("imsg_compose PACK");
2016 		close(fd);
2017 		return err;
2018 	}
2019 
2020 	return flush_imsg(ibuf);
2021 }
2022 
2023 const struct got_error *
2024 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
2025     struct got_object_id *id)
2026 {
2027 	struct got_imsg_packed_object iobj;
2028 
2029 	iobj.idx = idx;
2030 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2031 
2032 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
2033 	    &iobj, sizeof(iobj)) == -1)
2034 		return got_error_from_errno("imsg_compose "
2035 		    "PACKED_OBJECT_REQUEST");
2036 
2037 	return flush_imsg(ibuf);
2038 }
2039 
2040 const struct got_error *
2041 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
2042     struct got_object_id *id)
2043 {
2044 	struct got_imsg_packed_object iobj;
2045 
2046 	iobj.idx = idx;
2047 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
2048 
2049 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2050 	    &iobj, sizeof(iobj)) == -1)
2051 		return got_error_from_errno("imsg_compose "
2052 		    "PACKED_OBJECT_REQUEST");
2053 
2054 	return flush_imsg(ibuf);
2055 }
2056 
2057 const struct got_error *
2058 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2059 {
2060 	const struct got_error *err = NULL;
2061 
2062 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2063 	    NULL, 0) == -1) {
2064 		err = got_error_from_errno("imsg_compose "
2065 		    "GITCONFIG_PARSE_REQUEST");
2066 		close(fd);
2067 		return err;
2068 	}
2069 
2070 	return flush_imsg(ibuf);
2071 }
2072 
2073 const struct got_error *
2074 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2075 {
2076 	if (imsg_compose(ibuf,
2077 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2078 	    NULL, 0) == -1)
2079 		return got_error_from_errno("imsg_compose "
2080 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2081 
2082 	return flush_imsg(ibuf);
2083 }
2084 
2085 const struct got_error *
2086 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2087 {
2088 	if (imsg_compose(ibuf,
2089 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2090 	    NULL, 0) == -1)
2091 		return got_error_from_errno("imsg_compose "
2092 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2093 
2094 	return flush_imsg(ibuf);
2095 }
2096 
2097 
2098 const struct got_error *
2099 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2100 {
2101 	if (imsg_compose(ibuf,
2102 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2103 		return got_error_from_errno("imsg_compose "
2104 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2105 
2106 	return flush_imsg(ibuf);
2107 }
2108 
2109 const struct got_error *
2110 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2111 {
2112 	if (imsg_compose(ibuf,
2113 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2114 		return got_error_from_errno("imsg_compose "
2115 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2116 
2117 	return flush_imsg(ibuf);
2118 }
2119 
2120 const struct got_error *
2121 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2122 {
2123 	if (imsg_compose(ibuf,
2124 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2125 		return got_error_from_errno("imsg_compose "
2126 		    "GITCONFIG_REMOTE_REQUEST");
2127 
2128 	return flush_imsg(ibuf);
2129 }
2130 
2131 const struct got_error *
2132 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2133 {
2134 	if (imsg_compose(ibuf,
2135 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2136 		return got_error_from_errno("imsg_compose "
2137 		    "GITCONFIG_OWNER_REQUEST");
2138 
2139 	return flush_imsg(ibuf);
2140 }
2141 
2142 const struct got_error *
2143 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2144 {
2145 	const struct got_error *err = NULL;
2146 	struct imsg imsg;
2147 	size_t datalen;
2148 	const size_t min_datalen = 0;
2149 
2150 	*str = NULL;
2151 
2152 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2153 	if (err)
2154 		return err;
2155 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2156 
2157 	switch (imsg.hdr.type) {
2158 	case GOT_IMSG_GITCONFIG_STR_VAL:
2159 		if (datalen == 0)
2160 			break;
2161 		/* datalen does not include terminating \0 */
2162 		*str = malloc(datalen + 1);
2163 		if (*str == NULL) {
2164 			err = got_error_from_errno("malloc");
2165 			break;
2166 		}
2167 		memcpy(*str, imsg.data, datalen);
2168 		(*str)[datalen] = '\0';
2169 		break;
2170 	default:
2171 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2172 		break;
2173 	}
2174 
2175 	imsg_free(&imsg);
2176 	return err;
2177 }
2178 
2179 const struct got_error *
2180 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2181 {
2182 	const struct got_error *err = NULL;
2183 	struct imsg imsg;
2184 	size_t datalen;
2185 	const size_t min_datalen =
2186 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2187 
2188 	*val = 0;
2189 
2190 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2191 	if (err)
2192 		return err;
2193 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2194 
2195 	switch (imsg.hdr.type) {
2196 	case GOT_IMSG_GITCONFIG_INT_VAL:
2197 		if (datalen != sizeof(*val)) {
2198 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2199 			break;
2200 		}
2201 		memcpy(val, imsg.data, sizeof(*val));
2202 		break;
2203 	default:
2204 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2205 		break;
2206 	}
2207 
2208 	imsg_free(&imsg);
2209 	return err;
2210 }
2211 
2212 static void
2213 free_remote_data(struct got_remote_repo *remote)
2214 {
2215 	int i;
2216 
2217 	free(remote->name);
2218 	free(remote->fetch_url);
2219 	free(remote->send_url);
2220 	for (i = 0; i < remote->nfetch_branches; i++)
2221 		free(remote->fetch_branches[i]);
2222 	free(remote->fetch_branches);
2223 	for (i = 0; i < remote->nsend_branches; i++)
2224 		free(remote->send_branches[i]);
2225 	free(remote->send_branches);
2226 	for (i = 0; i < remote->nfetch_refs; i++)
2227 		free(remote->fetch_refs[i]);
2228 	free(remote->fetch_refs);
2229 }
2230 
2231 const struct got_error *
2232 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2233     int *nremotes, struct imsgbuf *ibuf)
2234 {
2235 	const struct got_error *err = NULL;
2236 	struct imsg imsg;
2237 	size_t datalen;
2238 	struct got_imsg_remotes iremotes;
2239 	struct got_imsg_remote iremote;
2240 
2241 	*remotes = NULL;
2242 	*nremotes = 0;
2243 	iremotes.nremotes = 0;
2244 
2245 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2246 	if (err)
2247 		return err;
2248 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2249 
2250 	switch (imsg.hdr.type) {
2251 	case GOT_IMSG_GITCONFIG_REMOTES:
2252 		if (datalen != sizeof(iremotes)) {
2253 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2254 			break;
2255 		}
2256 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2257 		if (iremotes.nremotes == 0) {
2258 			imsg_free(&imsg);
2259 			return NULL;
2260 		}
2261 		break;
2262 	default:
2263 		imsg_free(&imsg);
2264 		return got_error(GOT_ERR_PRIVSEP_MSG);
2265 	}
2266 
2267 	imsg_free(&imsg);
2268 
2269 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2270 	if (*remotes == NULL)
2271 		return got_error_from_errno("recallocarray");
2272 
2273 	while (*nremotes < iremotes.nremotes) {
2274 		struct got_remote_repo *remote;
2275 
2276 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2277 		if (err)
2278 			break;
2279 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2280 
2281 		switch (imsg.hdr.type) {
2282 		case GOT_IMSG_GITCONFIG_REMOTE:
2283 			remote = &(*remotes)[*nremotes];
2284 			memset(remote, 0, sizeof(*remote));
2285 			if (datalen < sizeof(iremote)) {
2286 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2287 				break;
2288 			}
2289 			memcpy(&iremote, imsg.data, sizeof(iremote));
2290 			if (iremote.name_len == 0 ||
2291 			    iremote.fetch_url_len == 0 ||
2292 			    iremote.send_url_len == 0 ||
2293 			    (sizeof(iremote) + iremote.name_len +
2294 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2295 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2296 				break;
2297 			}
2298 			remote->name = strndup(imsg.data + sizeof(iremote),
2299 			    iremote.name_len);
2300 			if (remote->name == NULL) {
2301 				err = got_error_from_errno("strndup");
2302 				break;
2303 			}
2304 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2305 			    iremote.name_len, iremote.fetch_url_len);
2306 			if (remote->fetch_url == NULL) {
2307 				err = got_error_from_errno("strndup");
2308 				free_remote_data(remote);
2309 				break;
2310 			}
2311 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2312 			    iremote.name_len + iremote.fetch_url_len,
2313 			    iremote.send_url_len);
2314 			if (remote->send_url == NULL) {
2315 				err = got_error_from_errno("strndup");
2316 				free_remote_data(remote);
2317 				break;
2318 			}
2319 			remote->mirror_references = iremote.mirror_references;
2320 			remote->fetch_all_branches = iremote.fetch_all_branches;
2321 			remote->nfetch_branches = 0;
2322 			remote->fetch_branches = NULL;
2323 			remote->nsend_branches = 0;
2324 			remote->send_branches = NULL;
2325 			remote->nfetch_refs = 0;
2326 			remote->fetch_refs = NULL;
2327 			(*nremotes)++;
2328 			break;
2329 		default:
2330 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2331 			break;
2332 		}
2333 
2334 		imsg_free(&imsg);
2335 		if (err)
2336 			break;
2337 	}
2338 
2339 	if (err) {
2340 		int i;
2341 		for (i = 0; i < *nremotes; i++)
2342 			free_remote_data(&(*remotes)[i]);
2343 		free(*remotes);
2344 		*remotes = NULL;
2345 		*nremotes = 0;
2346 	}
2347 	return err;
2348 }
2349 
2350 const struct got_error *
2351 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2352 {
2353 	const struct got_error *err = NULL;
2354 
2355 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2356 	    NULL, 0) == -1) {
2357 		err = got_error_from_errno("imsg_compose "
2358 		    "GOTCONFIG_PARSE_REQUEST");
2359 		close(fd);
2360 		return err;
2361 	}
2362 
2363 	return flush_imsg(ibuf);
2364 }
2365 
2366 const struct got_error *
2367 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2368 {
2369 	if (imsg_compose(ibuf,
2370 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2371 		return got_error_from_errno("imsg_compose "
2372 		    "GOTCONFIG_AUTHOR_REQUEST");
2373 
2374 	return flush_imsg(ibuf);
2375 }
2376 
2377 const struct got_error *
2378 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2379 {
2380 	if (imsg_compose(ibuf,
2381 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2382 		return got_error_from_errno("imsg_compose "
2383 		    "GOTCONFIG_REMOTE_REQUEST");
2384 
2385 	return flush_imsg(ibuf);
2386 }
2387 
2388 const struct got_error *
2389 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2390 {
2391 	const struct got_error *err = NULL;
2392 	struct imsg imsg;
2393 	size_t datalen;
2394 	const size_t min_datalen = 0;
2395 
2396 	*str = NULL;
2397 
2398 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2399 	if (err)
2400 		return err;
2401 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2402 
2403 	switch (imsg.hdr.type) {
2404 	case GOT_IMSG_ERROR:
2405 		if (datalen < sizeof(struct got_imsg_error)) {
2406 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2407 			break;
2408 		}
2409 		err = recv_imsg_error(&imsg, datalen);
2410 		break;
2411 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2412 		if (datalen == 0)
2413 			break;
2414 		/* datalen does not include terminating \0 */
2415 		*str = malloc(datalen + 1);
2416 		if (*str == NULL) {
2417 			err = got_error_from_errno("malloc");
2418 			break;
2419 		}
2420 		memcpy(*str, imsg.data, datalen);
2421 		(*str)[datalen] = '\0';
2422 		break;
2423 	default:
2424 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2425 		break;
2426 	}
2427 
2428 	imsg_free(&imsg);
2429 	return err;
2430 }
2431 
2432 const struct got_error *
2433 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2434     int *nremotes, struct imsgbuf *ibuf)
2435 {
2436 	const struct got_error *err = NULL;
2437 	struct imsg imsg;
2438 	size_t datalen;
2439 	struct got_imsg_remotes iremotes;
2440 	struct got_imsg_remote iremote;
2441 	const size_t min_datalen =
2442 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2443 
2444 	*remotes = NULL;
2445 	*nremotes = 0;
2446 	iremotes.nremotes = 0;
2447 
2448 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2449 	if (err)
2450 		return err;
2451 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2452 
2453 	switch (imsg.hdr.type) {
2454 	case GOT_IMSG_ERROR:
2455 		if (datalen < sizeof(struct got_imsg_error)) {
2456 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2457 			break;
2458 		}
2459 		err = recv_imsg_error(&imsg, datalen);
2460 		break;
2461 	case GOT_IMSG_GOTCONFIG_REMOTES:
2462 		if (datalen != sizeof(iremotes)) {
2463 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2464 			break;
2465 		}
2466 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2467 		if (iremotes.nremotes == 0) {
2468 			imsg_free(&imsg);
2469 			return NULL;
2470 		}
2471 		break;
2472 	default:
2473 		imsg_free(&imsg);
2474 		return got_error(GOT_ERR_PRIVSEP_MSG);
2475 	}
2476 
2477 	imsg_free(&imsg);
2478 
2479 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2480 	if (*remotes == NULL)
2481 		return got_error_from_errno("recallocarray");
2482 
2483 	while (*nremotes < iremotes.nremotes) {
2484 		struct got_remote_repo *remote;
2485 		const size_t min_datalen =
2486 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2487 		int i;
2488 
2489 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2490 		if (err)
2491 			break;
2492 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2493 
2494 		switch (imsg.hdr.type) {
2495 		case GOT_IMSG_ERROR:
2496 			if (datalen < sizeof(struct got_imsg_error)) {
2497 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2498 				break;
2499 			}
2500 			err = recv_imsg_error(&imsg, datalen);
2501 			break;
2502 		case GOT_IMSG_GOTCONFIG_REMOTE:
2503 			remote = &(*remotes)[*nremotes];
2504 			memset(remote, 0, sizeof(*remote));
2505 			if (datalen < sizeof(iremote)) {
2506 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2507 				break;
2508 			}
2509 			memcpy(&iremote, imsg.data, sizeof(iremote));
2510 			if (iremote.name_len == 0 ||
2511 			    (iremote.fetch_url_len == 0 &&
2512 			    iremote.send_url_len == 0) ||
2513 			    (sizeof(iremote) + iremote.name_len +
2514 			    iremote.fetch_url_len + iremote.send_url_len) >
2515 			    datalen) {
2516 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2517 				break;
2518 			}
2519 			remote->name = strndup(imsg.data + sizeof(iremote),
2520 			    iremote.name_len);
2521 			if (remote->name == NULL) {
2522 				err = got_error_from_errno("strndup");
2523 				break;
2524 			}
2525 			remote->fetch_url = strndup(imsg.data +
2526 			    sizeof(iremote) + iremote.name_len,
2527 			    iremote.fetch_url_len);
2528 			if (remote->fetch_url == NULL) {
2529 				err = got_error_from_errno("strndup");
2530 				free_remote_data(remote);
2531 				break;
2532 			}
2533 			remote->send_url = strndup(imsg.data +
2534 			    sizeof(iremote) + iremote.name_len +
2535 			    iremote.fetch_url_len, iremote.send_url_len);
2536 			if (remote->send_url == NULL) {
2537 				err = got_error_from_errno("strndup");
2538 				free_remote_data(remote);
2539 				break;
2540 			}
2541 			remote->mirror_references = iremote.mirror_references;
2542 			remote->fetch_all_branches = iremote.fetch_all_branches;
2543 			if (iremote.nfetch_branches > 0) {
2544 				remote->fetch_branches = recallocarray(NULL, 0,
2545 				    iremote.nfetch_branches, sizeof(char *));
2546 				if (remote->fetch_branches == NULL) {
2547 					err = got_error_from_errno("calloc");
2548 					free_remote_data(remote);
2549 					break;
2550 				}
2551 			}
2552 			remote->nfetch_branches = 0;
2553 			for (i = 0; i < iremote.nfetch_branches; i++) {
2554 				char *branch;
2555 				err = got_privsep_recv_gotconfig_str(&branch,
2556 				    ibuf);
2557 				if (err) {
2558 					free_remote_data(remote);
2559 					goto done;
2560 				}
2561 				remote->fetch_branches[i] = branch;
2562 				remote->nfetch_branches++;
2563 			}
2564 			if (iremote.nsend_branches > 0) {
2565 				remote->send_branches = recallocarray(NULL, 0,
2566 				    iremote.nsend_branches, sizeof(char *));
2567 				if (remote->send_branches == NULL) {
2568 					err = got_error_from_errno("calloc");
2569 					free_remote_data(remote);
2570 					break;
2571 				}
2572 			}
2573 			remote->nsend_branches = 0;
2574 			for (i = 0; i < iremote.nsend_branches; i++) {
2575 				char *branch;
2576 				err = got_privsep_recv_gotconfig_str(&branch,
2577 				    ibuf);
2578 				if (err) {
2579 					free_remote_data(remote);
2580 					goto done;
2581 				}
2582 				remote->send_branches[i] = branch;
2583 				remote->nsend_branches++;
2584 			}
2585 			if (iremote.nfetch_refs > 0) {
2586 				remote->fetch_refs = recallocarray(NULL, 0,
2587 				    iremote.nfetch_refs, sizeof(char *));
2588 				if (remote->fetch_refs == NULL) {
2589 					err = got_error_from_errno("calloc");
2590 					free_remote_data(remote);
2591 					break;
2592 				}
2593 			}
2594 			remote->nfetch_refs = 0;
2595 			for (i = 0; i < iremote.nfetch_refs; i++) {
2596 				char *ref;
2597 				err = got_privsep_recv_gotconfig_str(&ref,
2598 				    ibuf);
2599 				if (err) {
2600 					free_remote_data(remote);
2601 					goto done;
2602 				}
2603 				remote->fetch_refs[i] = ref;
2604 				remote->nfetch_refs++;
2605 			}
2606 			(*nremotes)++;
2607 			break;
2608 		default:
2609 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2610 			break;
2611 		}
2612 
2613 		imsg_free(&imsg);
2614 		if (err)
2615 			break;
2616 	}
2617 done:
2618 	if (err) {
2619 		int i;
2620 		for (i = 0; i < *nremotes; i++)
2621 			free_remote_data(&(*remotes)[i]);
2622 		free(*remotes);
2623 		*remotes = NULL;
2624 		*nremotes = 0;
2625 	}
2626 	return err;
2627 }
2628 
2629 const struct got_error *
2630 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2631     struct got_object_id *id, int idx, const char *path)
2632 {
2633 	struct ibuf *wbuf;
2634 	size_t path_len = strlen(path) + 1;
2635 
2636 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2637 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2638 	if (wbuf == NULL)
2639 		return got_error_from_errno(
2640 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2641 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2642 		return got_error_from_errno("imsg_add "
2643 		    "COMMIT_TRAVERSAL_REQUEST");
2644 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2645 		return got_error_from_errno("imsg_add "
2646 		    "COMMIT_TRAVERSAL_REQUEST");
2647 	if (imsg_add(wbuf, path, path_len) == -1)
2648 		return got_error_from_errno("imsg_add "
2649 		    "COMMIT_TRAVERSAL_REQUEST");
2650 
2651 	wbuf->fd = -1;
2652 	imsg_close(ibuf, wbuf);
2653 
2654 	return flush_imsg(ibuf);
2655 }
2656 
2657 const struct got_error *
2658 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2659     struct got_object_id **changed_commit_id,
2660     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2661 {
2662 	const struct got_error *err = NULL;
2663 	struct imsg imsg;
2664 	struct got_imsg_traversed_commits *icommits;
2665 	size_t datalen;
2666 	int i, done = 0;
2667 
2668 	*changed_commit = NULL;
2669 	*changed_commit_id = NULL;
2670 
2671 	while (!done) {
2672 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2673 		if (err)
2674 			return err;
2675 
2676 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2677 		switch (imsg.hdr.type) {
2678 		case GOT_IMSG_TRAVERSED_COMMITS:
2679 			icommits = imsg.data;
2680 			if (datalen != sizeof(*icommits) +
2681 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2682 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2683 				break;
2684 			}
2685 			for (i = 0; i < icommits->ncommits; i++) {
2686 				struct got_object_qid *qid;
2687 				uint8_t *sha1 = (uint8_t *)imsg.data +
2688 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2689 				err = got_object_qid_alloc_partial(&qid);
2690 				if (err)
2691 					break;
2692 				memcpy(qid->id.sha1, sha1, SHA1_DIGEST_LENGTH);
2693 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2694 
2695 				/* The last commit may contain a change. */
2696 				if (i == icommits->ncommits - 1) {
2697 					*changed_commit_id =
2698 					    got_object_id_dup(&qid->id);
2699 					if (*changed_commit_id == NULL) {
2700 						err = got_error_from_errno(
2701 						    "got_object_id_dup");
2702 						break;
2703 					}
2704 				}
2705 			}
2706 			break;
2707 		case GOT_IMSG_COMMIT:
2708 			if (*changed_commit_id == NULL) {
2709 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2710 				break;
2711 			}
2712 			err = get_commit_from_imsg(changed_commit, &imsg,
2713 			    datalen, ibuf);
2714 			break;
2715 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2716 			done = 1;
2717 			break;
2718 		default:
2719 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2720 			break;
2721 		}
2722 
2723 		imsg_free(&imsg);
2724 		if (err)
2725 			break;
2726 	}
2727 
2728 	if (err)
2729 		got_object_id_queue_free(commit_ids);
2730 	return err;
2731 }
2732 
2733 const struct got_error *
2734 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
2735     struct got_object_id *id)
2736 {
2737 	struct got_imsg_raw_delta_request dreq;
2738 
2739 	dreq.idx = idx;
2740 	memcpy(dreq.id, id->sha1, SHA1_DIGEST_LENGTH);
2741 
2742 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
2743 	    &dreq, sizeof(dreq)) == -1)
2744 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
2745 
2746 	return flush_imsg(ibuf);
2747 }
2748 
2749 const struct got_error *
2750 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
2751 {
2752 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
2753 }
2754 
2755 const struct got_error *
2756 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
2757     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
2758     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
2759 {
2760 	struct got_imsg_raw_delta idelta;
2761 	int ret;
2762 
2763 	idelta.base_size = base_size;
2764 	idelta.result_size = result_size;
2765 	idelta.delta_size = delta_size;
2766 	idelta.delta_compressed_size = delta_compressed_size;
2767 	idelta.delta_offset = delta_offset;
2768 	idelta.delta_out_offset = delta_out_offset;
2769 	memcpy(idelta.base_id, base_id->sha1, SHA1_DIGEST_LENGTH);
2770 
2771 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
2772 	    &idelta, sizeof(idelta));
2773 	if (ret == -1)
2774 		return got_error_from_errno("imsg_compose RAW_DELTA");
2775 
2776 	return flush_imsg(ibuf);
2777 }
2778 
2779 const struct got_error *
2780 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
2781     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
2782     off_t *delta_out_offset, struct got_object_id **base_id, struct imsgbuf *ibuf)
2783 {
2784 	const struct got_error *err = NULL;
2785 	struct imsg imsg;
2786 	struct got_imsg_raw_delta *delta;
2787 	size_t datalen;
2788 
2789 	*base_size = 0;
2790 	*result_size = 0;
2791 	*delta_size = 0;
2792 	*delta_compressed_size = 0;
2793 	*delta_offset = 0;
2794 	*delta_out_offset = 0;
2795 	*base_id = NULL;
2796 
2797 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2798 	if (err)
2799 		return err;
2800 
2801 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2802 
2803 	switch (imsg.hdr.type) {
2804 	case GOT_IMSG_RAW_DELTA:
2805 		if (datalen != sizeof(*delta)) {
2806 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2807 			break;
2808 		}
2809 		delta = imsg.data;
2810 		*base_size = delta->base_size;
2811 		*result_size = delta->result_size;
2812 		*delta_size = delta->delta_size;
2813 		*delta_compressed_size = delta->delta_compressed_size;
2814 		*delta_offset = delta->delta_offset;
2815 		*delta_out_offset = delta->delta_out_offset;
2816 		*base_id = calloc(1, sizeof(**base_id));
2817 		if (*base_id == NULL) {
2818 			err = got_error_from_errno("malloc");
2819 			break;
2820 		}
2821 		memcpy((*base_id)->sha1, delta->base_id, SHA1_DIGEST_LENGTH);
2822 		break;
2823 	default:
2824 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2825 		break;
2826 	}
2827 
2828 	imsg_free(&imsg);
2829 
2830 	if (err) {
2831 		free(*base_id);
2832 		*base_id = NULL;
2833 	}
2834 	return err;
2835 }
2836 
2837 const struct got_error *
2838 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
2839     struct got_object_id **ids, size_t nids)
2840 {
2841 	const struct got_error *err = NULL;
2842 	struct got_imsg_object_idlist idlist;
2843 	struct ibuf *wbuf;
2844 	size_t i;
2845 
2846 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
2847 		return got_error(GOT_ERR_NO_SPACE);
2848 
2849 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
2850 	    sizeof(idlist) + nids * sizeof(**ids));
2851 	if (wbuf == NULL) {
2852 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
2853 		return err;
2854 	}
2855 
2856 	idlist.nids = nids;
2857 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
2858 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
2859 
2860 	for (i = 0; i < nids; i++) {
2861 		struct got_object_id *id = ids[i];
2862 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
2863 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
2864 	}
2865 	
2866 	wbuf->fd = -1;
2867 	imsg_close(ibuf, wbuf);
2868 
2869 	return flush_imsg(ibuf);
2870 }
2871 
2872 const struct got_error *
2873 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
2874 {
2875 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
2876 	    == -1)
2877 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
2878 
2879 	return flush_imsg(ibuf);
2880 }
2881 
2882 const struct got_error *
2883 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
2884     size_t *nids, struct imsgbuf *ibuf)
2885 {
2886 	const struct got_error *err = NULL;
2887 	struct imsg imsg;
2888 	struct got_imsg_object_idlist *idlist;
2889 	size_t datalen;
2890 
2891 	*ids = NULL;
2892 	*done = 0;
2893 	*nids = 0;
2894 
2895 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2896 	if (err)
2897 		return err;
2898 
2899 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2900 	switch (imsg.hdr.type) {
2901 	case GOT_IMSG_OBJ_ID_LIST:
2902 		if (datalen < sizeof(*idlist)) {
2903 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2904 			break;
2905 		}
2906 		idlist = imsg.data;
2907 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
2908 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2909 			break;
2910 		}
2911 		*nids = idlist->nids;
2912 		*ids = calloc(*nids, sizeof(**ids));
2913 		if (*ids == NULL) {
2914 			err = got_error_from_errno("calloc");
2915 			break;
2916 		}
2917 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(idlist),
2918 		    *nids * sizeof(**ids));
2919 		break;
2920 	case GOT_IMSG_OBJ_ID_LIST_DONE:
2921 		*done = 1;
2922 		break;
2923 	default:
2924 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2925 		break;
2926 	}
2927 
2928 	imsg_free(&imsg);
2929 
2930 	return err;
2931 }
2932 
2933 const struct got_error *
2934 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
2935 {
2936 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
2937 	    == -1)
2938 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
2939 
2940 	return flush_imsg(ibuf);
2941 }
2942 
2943 const struct got_error *
2944 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
2945     struct got_imsg_reused_delta *deltas, size_t ndeltas)
2946 {
2947 	const struct got_error *err = NULL;
2948 	struct ibuf *wbuf;
2949 	struct got_imsg_reused_deltas ideltas;
2950 	size_t i;
2951 
2952 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
2953 		return got_error(GOT_ERR_NO_SPACE);
2954 
2955 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
2956 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
2957 	if (wbuf == NULL) {
2958 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
2959 		return err;
2960 	}
2961 
2962 	ideltas.ndeltas = ndeltas;
2963 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
2964 		return got_error_from_errno("imsg_add REUSED_DELTAS");
2965 
2966 	for (i = 0; i < ndeltas; i++) {
2967 		struct got_imsg_reused_delta *delta = &deltas[i];
2968 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
2969 			return got_error_from_errno("imsg_add REUSED_DELTAS");
2970 	}
2971 	
2972 	wbuf->fd = -1;
2973 	imsg_close(ibuf, wbuf);
2974 
2975 	return flush_imsg(ibuf);
2976 }
2977 
2978 const struct got_error *
2979 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
2980 {
2981 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
2982 	    == -1)
2983 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
2984 
2985 	return flush_imsg(ibuf);
2986 }
2987 
2988 const struct got_error *
2989 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
2990     size_t *ndeltas, struct imsgbuf *ibuf)
2991 {
2992 	const struct got_error *err = NULL;
2993 	struct imsg imsg;
2994 	struct got_imsg_reused_deltas *ideltas;
2995 	size_t datalen;
2996 
2997 	*done = 0;
2998 	*ndeltas = 0;
2999 
3000 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3001 	if (err)
3002 		return err;
3003 
3004 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3005 	switch (imsg.hdr.type) {
3006 	case GOT_IMSG_REUSED_DELTAS:
3007 		if (datalen < sizeof(*ideltas)) {
3008 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3009 			break;
3010 		}
3011 		ideltas = imsg.data;
3012 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS) {
3013 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3014 			break;
3015 		}
3016 		*ndeltas = ideltas->ndeltas;
3017 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(ideltas),
3018 		    *ndeltas * sizeof(*deltas));
3019 		break;
3020 	case GOT_IMSG_DELTA_REUSE_DONE:
3021 		*done = 1;
3022 		break;
3023 	default:
3024 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3025 		break;
3026 	}
3027 
3028 	imsg_free(&imsg);
3029 
3030 	return err;
3031 }
3032 
3033 const struct got_error *
3034 got_privsep_unveil_exec_helpers(void)
3035 {
3036 	const char *helpers[] = {
3037 	    GOT_PATH_PROG_READ_PACK,
3038 	    GOT_PATH_PROG_READ_OBJECT,
3039 	    GOT_PATH_PROG_READ_COMMIT,
3040 	    GOT_PATH_PROG_READ_TREE,
3041 	    GOT_PATH_PROG_READ_BLOB,
3042 	    GOT_PATH_PROG_READ_TAG,
3043 	    GOT_PATH_PROG_READ_GITCONFIG,
3044 	    GOT_PATH_PROG_READ_GOTCONFIG,
3045 	    GOT_PATH_PROG_READ_PATCH,
3046 	    GOT_PATH_PROG_FETCH_PACK,
3047 	    GOT_PATH_PROG_INDEX_PACK,
3048 	    GOT_PATH_PROG_SEND_PACK,
3049 	};
3050 	size_t i;
3051 
3052 	for (i = 0; i < nitems(helpers); i++) {
3053 		if (unveil(helpers[i], "x") == 0)
3054 			continue;
3055 		return got_error_from_errno2("unveil", helpers[i]);
3056 	}
3057 
3058 	return NULL;
3059 }
3060 
3061 void
3062 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3063 {
3064 	if (close(imsg_fds[0]) == -1) {
3065 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3066 		_exit(1);
3067 	}
3068 
3069 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3070 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3071 		_exit(1);
3072 	}
3073 
3074 	closefrom(GOT_IMSG_FD_CHILD + 1);
3075 
3076 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3077 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3078 		    strerror(errno));
3079 		_exit(1);
3080 	}
3081 }