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Date:: Wed Mar 18 16:10:30 2020 UTC
Message:: Add initial support for network protocol. Ported from git9 by Ori Bernstein.
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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/syslimits.h>
22 #include <sys/wait.h>
23 
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <errno.h>
28 #include <stdint.h>
29 #include <poll.h>
30 #include <imsg.h>
31 #include <sha1.h>
32 #include <zlib.h>
33 #include <time.h>
34 
35 #include "got_object.h"
36 #include "got_error.h"
37 #include "got_path.h"
38 #include "got_repository.h"
39 
40 #include "got_lib_sha1.h"
41 #include "got_lib_delta.h"
42 #include "got_lib_inflate.h"
43 #include "got_lib_object.h"
44 #include "got_lib_object_parse.h"
45 #include "got_lib_privsep.h"
46 #include "got_lib_pack.h"
47 
48 #ifndef MIN
49 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
50 #endif
51 
52 #ifndef nitems
53 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
54 #endif
55 
56 static const struct got_error *
57 poll_fd(int fd, int events, int timeout)
58 {
59 	struct pollfd pfd[1];
60 	int n;
61 
62 	pfd[0].fd = fd;
63 	pfd[0].events = events;
64 
65 	n = poll(pfd, 1, timeout);
66 	if (n == -1)
67 		return got_error_from_errno("poll");
68 	if (n == 0)
69 		return got_error(GOT_ERR_TIMEOUT);
70 	if (pfd[0].revents & (POLLERR | POLLNVAL))
71 		return got_error_from_errno("poll error");
72 	if (pfd[0].revents & (events | POLLHUP))
73 		return NULL;
74 
75 	return got_error(GOT_ERR_INTERRUPT);
76 }
77 
78 static const struct got_error *
79 read_imsg(struct imsgbuf *ibuf)
80 {
81 	const struct got_error *err;
82 	size_t n;
83 
84 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
85 	if (err)
86 		return err;
87 
88 	n = imsg_read(ibuf);
89 	if (n == -1) {
90 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
91 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
92 		return got_error(GOT_ERR_PRIVSEP_READ);
93 	}
94 	if (n == 0)
95 		return got_error(GOT_ERR_PRIVSEP_PIPE);
96 
97 	return NULL;
98 }
99 
100 const struct got_error *
101 got_privsep_wait_for_child(pid_t pid)
102 {
103 	int child_status;
104 
105 	if (waitpid(pid, &child_status, 0) == -1)
106 		return got_error_from_errno("waitpid");
107 
108 	if (!WIFEXITED(child_status))
109 		return got_error(GOT_ERR_PRIVSEP_DIED);
110 
111 	if (WEXITSTATUS(child_status) != 0)
112 		return got_error(GOT_ERR_PRIVSEP_EXIT);
113 
114 	return NULL;
115 }
116 
117 static const struct got_error *
118 recv_imsg_error(struct imsg *imsg, size_t datalen)
119 {
120 	struct got_imsg_error *ierr;
121 
122 	if (datalen != sizeof(*ierr))
123 		return got_error(GOT_ERR_PRIVSEP_LEN);
124 
125 	ierr = imsg->data;
126 	if (ierr->code == GOT_ERR_ERRNO) {
127 		static struct got_error serr;
128 		serr.code = GOT_ERR_ERRNO;
129 		serr.msg = strerror(ierr->errno_code);
130 		return &serr;
131 	}
132 
133 	return got_error(ierr->code);
134 }
135 
136 const struct got_error *
137 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
138     size_t min_datalen)
139 {
140 	const struct got_error *err;
141 	ssize_t n;
142 
143 	n = imsg_get(ibuf, imsg);
144 	if (n == -1)
145 		return got_error_from_errno("imsg_get");
146 
147 	while (n == 0) {
148 		err = read_imsg(ibuf);
149 		if (err)
150 			return err;
151 		n = imsg_get(ibuf, imsg);
152 		if (n == -1)
153 			return got_error_from_errno("imsg_get");
154 	}
155 
156 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
157 		return got_error(GOT_ERR_PRIVSEP_LEN);
158 
159 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
160 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
161 		return recv_imsg_error(imsg, datalen);
162 	}
163 
164 	return NULL;
165 }
166 
167 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
168 void
169 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
170 {
171 	const struct got_error *poll_err;
172 	struct got_imsg_error ierr;
173 	int ret;
174 
175 	ierr.code = err->code;
176 	if (err->code == GOT_ERR_ERRNO)
177 		ierr.errno_code = errno;
178 	else
179 		ierr.errno_code = 0;
180 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
181 	if (ret == -1) {
182 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
183 		    getprogname(), err->code, err->msg, strerror(errno));
184 		return;
185 	}
186 
187 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
188 	if (poll_err) {
189 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
190 		    getprogname(), err->code, err->msg, poll_err->msg);
191 		return;
192 	}
193 
194 	ret = imsg_flush(ibuf);
195 	if (ret == -1) {
196 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
197 		    getprogname(), err->code, err->msg, strerror(errno));
198 		return;
199 	}
200 }
201 
202 static const struct got_error *
203 flush_imsg(struct imsgbuf *ibuf)
204 {
205 	const struct got_error *err;
206 
207 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
208 	if (err)
209 		return err;
210 
211 	if (imsg_flush(ibuf) == -1)
212 		return got_error_from_errno("imsg_flush");
213 
214 	return NULL;
215 }
216 
217 const struct got_error *
218 got_privsep_send_stop(int fd)
219 {
220 	const struct got_error *err = NULL;
221 	struct imsgbuf ibuf;
222 
223 	imsg_init(&ibuf, fd);
224 
225 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
226 		return got_error_from_errno("imsg_compose STOP");
227 
228 	err = flush_imsg(&ibuf);
229 	imsg_clear(&ibuf);
230 	return err;
231 }
232 
233 const struct got_error *
234 got_privsep_send_ack(struct imsgbuf *ibuf)
235 {
236 	if (imsg_compose(ibuf, GOT_IMSG_ACK, 0, 0, -1, NULL, 0) == -1)
237 		return got_error_from_errno("imsg_compose ACK");
238 	return flush_imsg(ibuf);
239 }
240 
241 const struct got_error *
242 got_privsep_wait_ack(struct imsgbuf *ibuf)
243 {
244 	const struct got_error *err = NULL;
245 	struct imsg imsg;
246 
247 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
248 	if (err)
249 		return err;
250 	if (imsg.hdr.type == GOT_IMSG_ACK && imsg.hdr.len - IMSG_HEADER_SIZE == 0)
251 		return NULL;
252 	else
253 		return got_error(GOT_ERR_PRIVSEP_MSG);
254 	imsg_free(&imsg);
255 }
256 
257 
258 const struct got_error *
259 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd)
260 {
261 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd, NULL, 0)
262 	    == -1)
263 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
264 
265 	return flush_imsg(ibuf);
266 }
267 
268 const struct got_error *
269 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
270     struct got_object_id *id, int pack_idx)
271 {
272 	const struct got_error *err = NULL;
273 	struct got_imsg_packed_object iobj, *iobjp;
274 	size_t len;
275 
276 	if (id) { /* commit is packed */
277 		iobj.idx = pack_idx;
278 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
279 		iobjp = &iobj;
280 		len = sizeof(iobj);
281 	} else {
282 		iobjp = NULL;
283 		len = 0;
284 	}
285 
286 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, iobjp, len)
287 	    == -1) {
288 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
289 		close(fd);
290 		return err;
291 	}
292 
293 	return flush_imsg(ibuf);
294 }
295 
296 const struct got_error *
297 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
298     struct got_object_id *id, int pack_idx)
299 {
300 	const struct got_error *err = NULL;
301 	struct ibuf *wbuf;
302 	size_t len = id ? sizeof(struct got_imsg_packed_object) : 0;
303 
304 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
305 	if (wbuf == NULL)
306 		return got_error_from_errno("imsg_create TREE_REQUEST");
307 
308 	if (id) { /* tree is packed */
309 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
310 			err = got_error_from_errno("imsg_add TREE_ENTRY");
311 			ibuf_free(wbuf);
312 			return err;
313 		}
314 
315 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1) {
316 			err = got_error_from_errno("imsg_add TREE_ENTRY");
317 			ibuf_free(wbuf);
318 			return err;
319 		}
320 	}
321 
322 	wbuf->fd = fd;
323 	imsg_close(ibuf, wbuf);
324 
325 	return flush_imsg(ibuf);
326 }
327 
328 const struct got_error *
329 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
330     struct got_object_id *id, int pack_idx)
331 {
332 	struct got_imsg_packed_object iobj, *iobjp;
333 	size_t len;
334 
335 	if (id) { /* tag is packed */
336 		iobj.idx = pack_idx;
337 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
338 		iobjp = &iobj;
339 		len = sizeof(iobj);
340 	} else {
341 		iobjp = NULL;
342 		len = 0;
343 	}
344 
345 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, iobjp, len)
346 	    == -1)
347 		return got_error_from_errno("imsg_compose TAG_REQUEST");
348 
349 	return flush_imsg(ibuf);
350 }
351 
352 const struct got_error *
353 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
354     struct got_object_id *id, int pack_idx)
355 {
356 	const struct got_error *err = NULL;
357 	struct got_imsg_packed_object iobj, *iobjp;
358 	size_t len;
359 
360 	if (id) { /* blob is packed */
361 		iobj.idx = pack_idx;
362 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
363 		iobjp = &iobj;
364 		len = sizeof(iobj);
365 	} else {
366 		iobjp = NULL;
367 		len = 0;
368 	}
369 
370 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, iobjp, len)
371 	    == -1) {
372 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
373 		close(infd);
374 		return err;
375 	}
376 
377 	return flush_imsg(ibuf);
378 }
379 
380 const struct got_error *
381 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
382 {
383 	const struct got_error *err = NULL;
384 
385 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
386 	    == -1) {
387 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
388 		close(outfd);
389 		return err;
390 	}
391 
392 	return flush_imsg(ibuf);
393 }
394 
395 const struct got_error *
396 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
397 {
398 	const struct got_error *err = NULL;
399 
400 	if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
401 	    == -1) {
402 		err = got_error_from_errno("imsg_compose TMPFD");
403 		close(fd);
404 		return err;
405 	}
406 
407 	return flush_imsg(ibuf);
408 }
409 
410 const struct got_error *
411 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
412 {
413 	struct got_imsg_object iobj;
414 
415 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
416 	iobj.type = obj->type;
417 	iobj.flags = obj->flags;
418 	iobj.hdrlen = obj->hdrlen;
419 	iobj.size = obj->size;
420 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
421 		iobj.pack_offset = obj->pack_offset;
422 		iobj.pack_idx = obj->pack_idx;
423 	}
424 
425 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
426 	    == -1)
427 		return got_error_from_errno("imsg_compose OBJECT");
428 
429 	return flush_imsg(ibuf);
430 }
431 
432 const struct got_error *
433 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd)
434 {
435 	const struct got_error *err = NULL;
436 
437 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
438 	    NULL, 0) == -1) {
439 		err = got_error_from_errno("imsg_compose FETCH_REQUEST");
440 		close(fd);
441 		return err;
442 	}
443 	return flush_imsg(ibuf);
444 }
445 
446 const struct got_error *
447 got_privsep_send_fetch_done(struct imsgbuf *ibuf, struct got_object_id hash)
448 {
449 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DONE, 0, 0, -1,
450 	    hash.sha1, SHA1_DIGEST_LENGTH) == -1)
451 		return got_error_from_errno("imsg_compose FETCH");
452 	return flush_imsg(ibuf);
453 }
454 
455 const struct got_error *
456 got_privsep_wait_fetch_done(struct imsgbuf *ibuf, struct got_object_id *hash)
457 {
458 	const struct got_error *err = NULL;
459 	struct imsg imsg;
460 
461 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
462 	if (err)
463 		return err;
464 	if (imsg.hdr.type == GOT_IMSG_FETCH_DONE &&
465 	    imsg.hdr.len - sizeof(imsg.hdr) == SHA1_DIGEST_LENGTH)
466 		return NULL;
467 	else
468 		return got_error(GOT_ERR_PRIVSEP_MSG);
469 	imsg_free(&imsg);
470 }
471 
472 
473 const struct got_error *
474 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, int fd, struct got_object_id hash)
475 {
476 	const struct got_error *err = NULL;
477 
478 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
479 	    hash.sha1, SHA1_DIGEST_LENGTH) == -1) {
480 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
481 		close(fd);
482 		return err;
483 	}
484 	return flush_imsg(ibuf);
485 }
486 
487 const struct got_error *
488 got_privsep_send_index_pack_done(struct imsgbuf *ibuf)
489 {
490 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_DONE, 0, 0, -1, NULL, 0) == -1)
491 		return got_error_from_errno("imsg_compose FETCH");
492 	return flush_imsg(ibuf);
493 }
494 
495 const struct got_error *
496 got_privsep_wait_index_pack_done(struct imsgbuf *ibuf)
497 {
498 	const struct got_error *err = NULL;
499 	struct imsg imsg;
500 
501 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
502 	if (err)
503 		return err;
504 	if (imsg.hdr.type == GOT_IMSG_IDXPACK_DONE)
505 		return NULL;
506 	else
507 		return got_error(GOT_ERR_PRIVSEP_MSG);
508 	imsg_free(&imsg);
509 }
510 
511 const struct got_error *
512 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
513     struct imsgbuf *ibuf)
514 {
515 	const struct got_error *err = NULL;
516 	struct got_imsg_object *iobj;
517 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
518 
519 	if (datalen != sizeof(*iobj))
520 		return got_error(GOT_ERR_PRIVSEP_LEN);
521 	iobj = imsg->data;
522 
523 	*obj = calloc(1, sizeof(**obj));
524 	if (*obj == NULL)
525 		return got_error_from_errno("calloc");
526 
527 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
528 	(*obj)->type = iobj->type;
529 	(*obj)->flags = iobj->flags;
530 	(*obj)->hdrlen = iobj->hdrlen;
531 	(*obj)->size = iobj->size;
532 	/* path_packfile is handled by caller */
533 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
534 		(*obj)->pack_offset = iobj->pack_offset;
535 		(*obj)->pack_idx = iobj->pack_idx;
536 	}
537 
538 	return err;
539 }
540 
541 const struct got_error *
542 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
543 {
544 	const struct got_error *err = NULL;
545 	struct imsg imsg;
546 	const size_t min_datalen =
547 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
548 
549 	*obj = NULL;
550 
551 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
552 	if (err)
553 		return err;
554 
555 	switch (imsg.hdr.type) {
556 	case GOT_IMSG_OBJECT:
557 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
558 		break;
559 	default:
560 		err = got_error(GOT_ERR_PRIVSEP_MSG);
561 		break;
562 	}
563 
564 	imsg_free(&imsg);
565 
566 	return err;
567 }
568 
569 static const struct got_error *
570 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
571     size_t logmsg_len)
572 {
573 	const struct got_error *err = NULL;
574 	size_t offset, remain;
575 
576 	offset = 0;
577 	remain = logmsg_len;
578 	while (remain > 0) {
579 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
580 
581 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
582 		    commit->logmsg + offset, n) == -1) {
583 			err = got_error_from_errno("imsg_compose "
584 			    "COMMIT_LOGMSG");
585 			break;
586 		}
587 
588 		err = flush_imsg(ibuf);
589 		if (err)
590 			break;
591 
592 		offset += n;
593 		remain -= n;
594 	}
595 
596 	return err;
597 }
598 
599 const struct got_error *
600 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
601 {
602 	const struct got_error *err = NULL;
603 	struct got_imsg_commit_object *icommit;
604 	uint8_t *buf;
605 	size_t len, total;
606 	struct got_object_qid *qid;
607 	size_t author_len = strlen(commit->author);
608 	size_t committer_len = strlen(commit->committer);
609 	size_t logmsg_len = strlen(commit->logmsg);
610 
611 	total = sizeof(*icommit) + author_len + committer_len +
612 	    commit->nparents * SHA1_DIGEST_LENGTH;
613 
614 	buf = malloc(total);
615 	if (buf == NULL)
616 		return got_error_from_errno("malloc");
617 
618 	icommit = (struct got_imsg_commit_object *)buf;
619 	memcpy(icommit->tree_id, commit->tree_id->sha1,
620 	    sizeof(icommit->tree_id));
621 	icommit->author_len = author_len;
622 	icommit->author_time = commit->author_time;
623 	icommit->author_gmtoff = commit->author_gmtoff;
624 	icommit->committer_len = committer_len;
625 	icommit->committer_time = commit->committer_time;
626 	icommit->committer_gmtoff = commit->committer_gmtoff;
627 	icommit->logmsg_len = logmsg_len;
628 	icommit->nparents = commit->nparents;
629 
630 	len = sizeof(*icommit);
631 	memcpy(buf + len, commit->author, author_len);
632 	len += author_len;
633 	memcpy(buf + len, commit->committer, committer_len);
634 	len += committer_len;
635 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
636 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
637 		len += SHA1_DIGEST_LENGTH;
638 	}
639 
640 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
641 		err = got_error_from_errno("imsg_compose COMMIT");
642 		goto done;
643 	}
644 
645 	if (logmsg_len == 0 ||
646 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
647 		err = flush_imsg(ibuf);
648 		if (err)
649 			goto done;
650 	}
651 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
652 done:
653 	free(buf);
654 	return err;
655 }
656 
657 static const struct got_error *
658 get_commit_from_imsg(struct got_commit_object **commit,
659     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
660 {
661 	const struct got_error *err = NULL;
662 	struct got_imsg_commit_object *icommit;
663 	size_t len = 0;
664 	int i;
665 
666 	if (datalen < sizeof(*icommit))
667 		return got_error(GOT_ERR_PRIVSEP_LEN);
668 
669 	icommit = imsg->data;
670 	if (datalen != sizeof(*icommit) + icommit->author_len +
671 	    icommit->committer_len +
672 	    icommit->nparents * SHA1_DIGEST_LENGTH)
673 		return got_error(GOT_ERR_PRIVSEP_LEN);
674 
675 	if (icommit->nparents < 0)
676 		return got_error(GOT_ERR_PRIVSEP_LEN);
677 
678 	len += sizeof(*icommit);
679 
680 	*commit = got_object_commit_alloc_partial();
681 	if (*commit == NULL)
682 		return got_error_from_errno(
683 		    "got_object_commit_alloc_partial");
684 
685 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
686 	    SHA1_DIGEST_LENGTH);
687 	(*commit)->author_time = icommit->author_time;
688 	(*commit)->author_gmtoff = icommit->author_gmtoff;
689 	(*commit)->committer_time = icommit->committer_time;
690 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
691 
692 	if (icommit->author_len == 0) {
693 		(*commit)->author = strdup("");
694 		if ((*commit)->author == NULL) {
695 			err = got_error_from_errno("strdup");
696 			goto done;
697 		}
698 	} else {
699 		(*commit)->author = malloc(icommit->author_len + 1);
700 		if ((*commit)->author == NULL) {
701 			err = got_error_from_errno("malloc");
702 			goto done;
703 		}
704 		memcpy((*commit)->author, imsg->data + len,
705 		    icommit->author_len);
706 		(*commit)->author[icommit->author_len] = '\0';
707 	}
708 	len += icommit->author_len;
709 
710 	if (icommit->committer_len == 0) {
711 		(*commit)->committer = strdup("");
712 		if ((*commit)->committer == NULL) {
713 			err = got_error_from_errno("strdup");
714 			goto done;
715 		}
716 	} else {
717 		(*commit)->committer =
718 		    malloc(icommit->committer_len + 1);
719 		if ((*commit)->committer == NULL) {
720 			err = got_error_from_errno("malloc");
721 			goto done;
722 		}
723 		memcpy((*commit)->committer, imsg->data + len,
724 		    icommit->committer_len);
725 		(*commit)->committer[icommit->committer_len] = '\0';
726 	}
727 	len += icommit->committer_len;
728 
729 	if (icommit->logmsg_len == 0) {
730 		(*commit)->logmsg = strdup("");
731 		if ((*commit)->logmsg == NULL) {
732 			err = got_error_from_errno("strdup");
733 			goto done;
734 		}
735 	} else {
736 		size_t offset = 0, remain = icommit->logmsg_len;
737 
738 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
739 		if ((*commit)->logmsg == NULL) {
740 			err = got_error_from_errno("malloc");
741 			goto done;
742 		}
743 		while (remain > 0) {
744 			struct imsg imsg_log;
745 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
746 			    remain);
747 
748 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
749 			if (err)
750 				goto done;
751 
752 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
753 				err = got_error(GOT_ERR_PRIVSEP_MSG);
754 				goto done;
755 			}
756 
757 			memcpy((*commit)->logmsg + offset,
758 			    imsg_log.data, n);
759 			imsg_free(&imsg_log);
760 			offset += n;
761 			remain -= n;
762 		}
763 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
764 	}
765 
766 	for (i = 0; i < icommit->nparents; i++) {
767 		struct got_object_qid *qid;
768 
769 		err = got_object_qid_alloc_partial(&qid);
770 		if (err)
771 			break;
772 		memcpy(qid->id, imsg->data + len +
773 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
774 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
775 		(*commit)->nparents++;
776 	}
777 done:
778 	if (err) {
779 		got_object_commit_close(*commit);
780 		*commit = NULL;
781 	}
782 	return err;
783 }
784 
785 const struct got_error *
786 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
787 {
788 	const struct got_error *err = NULL;
789 	struct imsg imsg;
790 	size_t datalen;
791 	const size_t min_datalen =
792 	    MIN(sizeof(struct got_imsg_error),
793 	    sizeof(struct got_imsg_commit_object));
794 
795 	*commit = NULL;
796 
797 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
798 	if (err)
799 		return err;
800 
801 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
802 
803 	switch (imsg.hdr.type) {
804 	case GOT_IMSG_COMMIT:
805 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
806 		break;
807 	default:
808 		err = got_error(GOT_ERR_PRIVSEP_MSG);
809 		break;
810 	}
811 
812 	imsg_free(&imsg);
813 
814 	return err;
815 }
816 
817 const struct got_error *
818 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
819     int nentries)
820 {
821 	const struct got_error *err = NULL;
822 	struct got_imsg_tree_object itree;
823 	struct got_pathlist_entry *pe;
824 	size_t totlen;
825 	int nimsg; /* number of imsg queued in ibuf */
826 
827 	itree.nentries = nentries;
828 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
829 	    == -1)
830 		return got_error_from_errno("imsg_compose TREE");
831 
832 	totlen = sizeof(itree);
833 	nimsg = 1;
834 	TAILQ_FOREACH(pe, entries, entry) {
835 		const char *name = pe->path;
836 		struct got_parsed_tree_entry *pte = pe->data;
837 		struct ibuf *wbuf;
838 		size_t namelen = strlen(name);
839 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
840 
841 		if (len > MAX_IMSGSIZE)
842 			return got_error(GOT_ERR_NO_SPACE);
843 
844 		nimsg++;
845 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
846 			err = flush_imsg(ibuf);
847 			if (err)
848 				return err;
849 			nimsg = 0;
850 		}
851 
852 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
853 		if (wbuf == NULL)
854 			return got_error_from_errno("imsg_create TREE_ENTRY");
855 
856 		/* Keep in sync with struct got_imsg_tree_object definition! */
857 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
858 			err = got_error_from_errno("imsg_add TREE_ENTRY");
859 			ibuf_free(wbuf);
860 			return err;
861 		}
862 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
863 			err = got_error_from_errno("imsg_add TREE_ENTRY");
864 			ibuf_free(wbuf);
865 			return err;
866 		}
867 
868 		if (imsg_add(wbuf, name, namelen) == -1) {
869 			err = got_error_from_errno("imsg_add TREE_ENTRY");
870 			ibuf_free(wbuf);
871 			return err;
872 		}
873 
874 		wbuf->fd = -1;
875 		imsg_close(ibuf, wbuf);
876 
877 		totlen += len;
878 	}
879 
880 	return flush_imsg(ibuf);
881 }
882 
883 const struct got_error *
884 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
885 {
886 	const struct got_error *err = NULL;
887 	const size_t min_datalen =
888 	    MIN(sizeof(struct got_imsg_error),
889 	    sizeof(struct got_imsg_tree_object));
890 	struct got_imsg_tree_object *itree;
891 	int nentries = 0;
892 
893 	*tree = NULL;
894 get_more:
895 	err = read_imsg(ibuf);
896 	if (err)
897 		goto done;
898 
899 	for (;;) {
900 		struct imsg imsg;
901 		size_t n;
902 		size_t datalen;
903 		struct got_imsg_tree_entry *ite;
904 		struct got_tree_entry *te = NULL;
905 
906 		n = imsg_get(ibuf, &imsg);
907 		if (n == 0) {
908 			if (*tree && (*tree)->nentries != nentries)
909 				goto get_more;
910 			break;
911 		}
912 
913 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
914 			return got_error(GOT_ERR_PRIVSEP_LEN);
915 
916 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
917 
918 		switch (imsg.hdr.type) {
919 		case GOT_IMSG_ERROR:
920 			err = recv_imsg_error(&imsg, datalen);
921 			break;
922 		case GOT_IMSG_TREE:
923 			/* This message should only appear once. */
924 			if (*tree != NULL) {
925 				err = got_error(GOT_ERR_PRIVSEP_MSG);
926 				break;
927 			}
928 			if (datalen != sizeof(*itree)) {
929 				err = got_error(GOT_ERR_PRIVSEP_LEN);
930 				break;
931 			}
932 			itree = imsg.data;
933 			*tree = malloc(sizeof(**tree));
934 			if (*tree == NULL) {
935 				err = got_error_from_errno("malloc");
936 				break;
937 			}
938 			(*tree)->entries = calloc(itree->nentries,
939 			    sizeof(struct got_tree_entry));
940 			if ((*tree)->entries == NULL) {
941 				err = got_error_from_errno("malloc");
942 				break;
943 			}
944 			(*tree)->nentries = itree->nentries;
945 			(*tree)->refcnt = 0;
946 			break;
947 		case GOT_IMSG_TREE_ENTRY:
948 			/* This message should be preceeded by GOT_IMSG_TREE. */
949 			if (*tree == NULL) {
950 				err = got_error(GOT_ERR_PRIVSEP_MSG);
951 				break;
952 			}
953 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
954 				err = got_error(GOT_ERR_PRIVSEP_LEN);
955 				break;
956 			}
957 
958 			/* Remaining data contains the entry's name. */
959 			datalen -= sizeof(*ite);
960 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
961 				err = got_error(GOT_ERR_PRIVSEP_LEN);
962 				break;
963 			}
964 			ite = imsg.data;
965 
966 			if (datalen + 1 > sizeof(te->name)) {
967 				err = got_error(GOT_ERR_NO_SPACE);
968 				break;
969 			}
970 			te = &(*tree)->entries[nentries];
971 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
972 			te->name[datalen] = '\0';
973 
974 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
975 			te->mode = ite->mode;
976 			te->idx = nentries;
977 			nentries++;
978 			break;
979 		default:
980 			err = got_error(GOT_ERR_PRIVSEP_MSG);
981 			break;
982 		}
983 
984 		imsg_free(&imsg);
985 	}
986 done:
987 	if (*tree && (*tree)->nentries != nentries) {
988 		if (err == NULL)
989 			err = got_error(GOT_ERR_PRIVSEP_LEN);
990 		got_object_tree_close(*tree);
991 		*tree = NULL;
992 	}
993 
994 	return err;
995 }
996 
997 const struct got_error *
998 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
999     const uint8_t *data)
1000 {
1001 	struct got_imsg_blob iblob;
1002 
1003 	iblob.size = size;
1004 	iblob.hdrlen = hdrlen;
1005 
1006 	if (data) {
1007 		uint8_t *buf;
1008 
1009 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1010 			return got_error(GOT_ERR_NO_SPACE);
1011 
1012 		buf = malloc(sizeof(iblob) + size);
1013 		if (buf == NULL)
1014 			return got_error_from_errno("malloc");
1015 
1016 		memcpy(buf, &iblob, sizeof(iblob));
1017 		memcpy(buf + sizeof(iblob), data, size);
1018 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1019 		   sizeof(iblob) + size) == -1) {
1020 			free(buf);
1021 			return got_error_from_errno("imsg_compose BLOB");
1022 		}
1023 		free(buf);
1024 	} else {
1025 		/* Data has already been written to file descriptor. */
1026 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1027 		    sizeof(iblob)) == -1)
1028 			return got_error_from_errno("imsg_compose BLOB");
1029 	}
1030 
1031 
1032 	return flush_imsg(ibuf);
1033 }
1034 
1035 const struct got_error *
1036 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1037     struct imsgbuf *ibuf)
1038 {
1039 	const struct got_error *err = NULL;
1040 	struct imsg imsg;
1041 	struct got_imsg_blob *iblob;
1042 	size_t datalen;
1043 
1044 	*outbuf = NULL;
1045 
1046 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1047 	if (err)
1048 		return err;
1049 
1050 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1051 
1052 	switch (imsg.hdr.type) {
1053 	case GOT_IMSG_BLOB:
1054 		if (datalen < sizeof(*iblob)) {
1055 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1056 			break;
1057 		}
1058 		iblob = imsg.data;
1059 		*size = iblob->size;
1060 		*hdrlen = iblob->hdrlen;
1061 
1062 		if (datalen == sizeof(*iblob)) {
1063 			/* Data has been written to file descriptor. */
1064 			break;
1065 		}
1066 
1067 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1068 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1069 			break;
1070 		}
1071 
1072 		*outbuf = malloc(*size);
1073 		if (*outbuf == NULL) {
1074 			err = got_error_from_errno("malloc");
1075 			break;
1076 		}
1077 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1078 		break;
1079 	default:
1080 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1081 		break;
1082 	}
1083 
1084 	imsg_free(&imsg);
1085 
1086 	return err;
1087 }
1088 
1089 static const struct got_error *
1090 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1091 {
1092 	const struct got_error *err = NULL;
1093 	size_t offset, remain;
1094 
1095 	offset = 0;
1096 	remain = tagmsg_len;
1097 	while (remain > 0) {
1098 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1099 
1100 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1101 		    tag->tagmsg + offset, n) == -1) {
1102 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1103 			break;
1104 		}
1105 
1106 		err = flush_imsg(ibuf);
1107 		if (err)
1108 			break;
1109 
1110 		offset += n;
1111 		remain -= n;
1112 	}
1113 
1114 	return err;
1115 }
1116 
1117 const struct got_error *
1118 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1119 {
1120 	const struct got_error *err = NULL;
1121 	struct got_imsg_tag_object *itag;
1122 	uint8_t *buf;
1123 	size_t len, total;
1124 	size_t tag_len = strlen(tag->tag);
1125 	size_t tagger_len = strlen(tag->tagger);
1126 	size_t tagmsg_len = strlen(tag->tagmsg);
1127 
1128 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1129 
1130 	buf = malloc(total);
1131 	if (buf == NULL)
1132 		return got_error_from_errno("malloc");
1133 
1134 	itag = (struct got_imsg_tag_object *)buf;
1135 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1136 	itag->obj_type = tag->obj_type;
1137 	itag->tag_len = tag_len;
1138 	itag->tagger_len = tagger_len;
1139 	itag->tagger_time = tag->tagger_time;
1140 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1141 	itag->tagmsg_len = tagmsg_len;
1142 
1143 	len = sizeof(*itag);
1144 	memcpy(buf + len, tag->tag, tag_len);
1145 	len += tag_len;
1146 	memcpy(buf + len, tag->tagger, tagger_len);
1147 	len += tagger_len;
1148 
1149 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1150 		err = got_error_from_errno("imsg_compose TAG");
1151 		goto done;
1152 	}
1153 
1154 	if (tagmsg_len == 0 ||
1155 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1156 		err = flush_imsg(ibuf);
1157 		if (err)
1158 			goto done;
1159 	}
1160 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1161 done:
1162 	free(buf);
1163 	return err;
1164 }
1165 
1166 const struct got_error *
1167 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1168 {
1169 	const struct got_error *err = NULL;
1170 	struct imsg imsg;
1171 	struct got_imsg_tag_object *itag;
1172 	size_t len, datalen;
1173 	const size_t min_datalen =
1174 	    MIN(sizeof(struct got_imsg_error),
1175 	    sizeof(struct got_imsg_tag_object));
1176 
1177 	*tag = NULL;
1178 
1179 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1180 	if (err)
1181 		return err;
1182 
1183 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1184 	len = 0;
1185 
1186 	switch (imsg.hdr.type) {
1187 	case GOT_IMSG_TAG:
1188 		if (datalen < sizeof(*itag)) {
1189 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1190 			break;
1191 		}
1192 		itag = imsg.data;
1193 		if (datalen != sizeof(*itag) + itag->tag_len +
1194 		    itag->tagger_len) {
1195 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1196 			break;
1197 		}
1198 		len += sizeof(*itag);
1199 
1200 		*tag = calloc(1, sizeof(**tag));
1201 		if (*tag == NULL) {
1202 			err = got_error_from_errno("calloc");
1203 			break;
1204 		}
1205 
1206 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1207 
1208 		if (itag->tag_len == 0) {
1209 			(*tag)->tag = strdup("");
1210 			if ((*tag)->tag == NULL) {
1211 				err = got_error_from_errno("strdup");
1212 				break;
1213 			}
1214 		} else {
1215 			(*tag)->tag = malloc(itag->tag_len + 1);
1216 			if ((*tag)->tag == NULL) {
1217 				err = got_error_from_errno("malloc");
1218 				break;
1219 			}
1220 			memcpy((*tag)->tag, imsg.data + len,
1221 			    itag->tag_len);
1222 			(*tag)->tag[itag->tag_len] = '\0';
1223 		}
1224 		len += itag->tag_len;
1225 
1226 		(*tag)->obj_type = itag->obj_type;
1227 		(*tag)->tagger_time = itag->tagger_time;
1228 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1229 
1230 		if (itag->tagger_len == 0) {
1231 			(*tag)->tagger = strdup("");
1232 			if ((*tag)->tagger == NULL) {
1233 				err = got_error_from_errno("strdup");
1234 				break;
1235 			}
1236 		} else {
1237 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1238 			if ((*tag)->tagger == NULL) {
1239 				err = got_error_from_errno("malloc");
1240 				break;
1241 			}
1242 			memcpy((*tag)->tagger, imsg.data + len,
1243 			    itag->tagger_len);
1244 			(*tag)->tagger[itag->tagger_len] = '\0';
1245 		}
1246 		len += itag->tagger_len;
1247 
1248 		if (itag->tagmsg_len == 0) {
1249 			(*tag)->tagmsg = strdup("");
1250 			if ((*tag)->tagmsg == NULL) {
1251 				err = got_error_from_errno("strdup");
1252 				break;
1253 			}
1254 		} else {
1255 			size_t offset = 0, remain = itag->tagmsg_len;
1256 
1257 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1258 			if ((*tag)->tagmsg == NULL) {
1259 				err = got_error_from_errno("malloc");
1260 				break;
1261 			}
1262 			while (remain > 0) {
1263 				struct imsg imsg_log;
1264 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1265 				    remain);
1266 
1267 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1268 				if (err)
1269 					return err;
1270 
1271 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1272 					return got_error(GOT_ERR_PRIVSEP_MSG);
1273 
1274 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1275 				    n);
1276 				imsg_free(&imsg_log);
1277 				offset += n;
1278 				remain -= n;
1279 			}
1280 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1281 		}
1282 
1283 		break;
1284 	default:
1285 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1286 		break;
1287 	}
1288 
1289 	imsg_free(&imsg);
1290 
1291 	return err;
1292 }
1293 
1294 const struct got_error *
1295 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1296     struct got_packidx *packidx)
1297 {
1298 	const struct got_error *err = NULL;
1299 	struct got_imsg_packidx ipackidx;
1300 	struct got_imsg_pack ipack;
1301 	int fd;
1302 
1303 	ipackidx.len = packidx->len;
1304 	fd = dup(packidx->fd);
1305 	if (fd == -1)
1306 		return got_error_from_errno("dup");
1307 
1308 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1309 	    sizeof(ipackidx)) == -1) {
1310 		err = got_error_from_errno("imsg_compose PACKIDX");
1311 		close(fd);
1312 		return err;
1313 	}
1314 
1315 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1316 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1317 		return got_error(GOT_ERR_NO_SPACE);
1318 	ipack.filesize = pack->filesize;
1319 
1320 	fd = dup(pack->fd);
1321 	if (fd == -1)
1322 		return got_error_from_errno("dup");
1323 
1324 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1325 	    == -1) {
1326 		err = got_error_from_errno("imsg_compose PACK");
1327 		close(fd);
1328 		return err;
1329 	}
1330 
1331 	return flush_imsg(ibuf);
1332 }
1333 
1334 const struct got_error *
1335 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1336     struct got_object_id *id)
1337 {
1338 	struct got_imsg_packed_object iobj;
1339 
1340 	iobj.idx = idx;
1341 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1342 
1343 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1344 	    &iobj, sizeof(iobj)) == -1)
1345 		return got_error_from_errno("imsg_compose "
1346 		    "PACKED_OBJECT_REQUEST");
1347 
1348 	return flush_imsg(ibuf);
1349 }
1350 
1351 const struct got_error *
1352 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1353 {
1354 	const struct got_error *err = NULL;
1355 
1356 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1357 	    NULL, 0) == -1) {
1358 		err = got_error_from_errno("imsg_compose "
1359 		    "GITCONFIG_PARSE_REQUEST");
1360 		close(fd);
1361 		return err;
1362 	}
1363 
1364 	return flush_imsg(ibuf);
1365 }
1366 
1367 const struct got_error *
1368 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1369 {
1370 	if (imsg_compose(ibuf,
1371 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1372 	    NULL, 0) == -1)
1373 		return got_error_from_errno("imsg_compose "
1374 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1375 
1376 	return flush_imsg(ibuf);
1377 }
1378 
1379 const struct got_error *
1380 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1381 {
1382 	if (imsg_compose(ibuf,
1383 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1384 		return got_error_from_errno("imsg_compose "
1385 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1386 
1387 	return flush_imsg(ibuf);
1388 }
1389 
1390 const struct got_error *
1391 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1392 {
1393 	if (imsg_compose(ibuf,
1394 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1395 		return got_error_from_errno("imsg_compose "
1396 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1397 
1398 	return flush_imsg(ibuf);
1399 }
1400 
1401 const struct got_error *
1402 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1403 {
1404 	if (imsg_compose(ibuf,
1405 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1406 		return got_error_from_errno("imsg_compose "
1407 		    "GITCONFIG_REMOTE_REQUEST");
1408 
1409 	return flush_imsg(ibuf);
1410 }
1411 
1412 const struct got_error *
1413 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
1414 {
1415 	if (imsg_compose(ibuf,
1416 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
1417 		return got_error_from_errno("imsg_compose "
1418 		    "GITCONFIG_OWNER_REQUEST");
1419 
1420 	return flush_imsg(ibuf);
1421 }
1422 
1423 const struct got_error *
1424 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1425 {
1426 	size_t len = value ? strlen(value) + 1 : 0;
1427 
1428 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1429 	    value, len) == -1)
1430 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1431 
1432 	return flush_imsg(ibuf);
1433 }
1434 
1435 const struct got_error *
1436 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1437 {
1438 	const struct got_error *err = NULL;
1439 	struct imsg imsg;
1440 	size_t datalen;
1441 	const size_t min_datalen = 0;
1442 
1443 	*str = NULL;
1444 
1445 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1446 	if (err)
1447 		return err;
1448 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1449 
1450 	switch (imsg.hdr.type) {
1451 	case GOT_IMSG_GITCONFIG_STR_VAL:
1452 		if (datalen == 0)
1453 			break;
1454 		*str = malloc(datalen);
1455 		if (*str == NULL) {
1456 			err = got_error_from_errno("malloc");
1457 			break;
1458 		}
1459 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1460 			err = got_error(GOT_ERR_NO_SPACE);
1461 		break;
1462 	default:
1463 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1464 		break;
1465 	}
1466 
1467 	imsg_free(&imsg);
1468 	return err;
1469 }
1470 
1471 const struct got_error *
1472 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1473 {
1474 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1475 	    &value, sizeof(value)) == -1)
1476 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1477 
1478 	return flush_imsg(ibuf);
1479 }
1480 
1481 const struct got_error *
1482 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1483 {
1484 	const struct got_error *err = NULL;
1485 	struct imsg imsg;
1486 	size_t datalen;
1487 	const size_t min_datalen =
1488 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1489 
1490 	*val = 0;
1491 
1492 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1493 	if (err)
1494 		return err;
1495 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1496 
1497 	switch (imsg.hdr.type) {
1498 	case GOT_IMSG_GITCONFIG_INT_VAL:
1499 		if (datalen != sizeof(*val)) {
1500 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1501 			break;
1502 		}
1503 		memcpy(val, imsg.data, sizeof(*val));
1504 		break;
1505 	default:
1506 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1507 		break;
1508 	}
1509 
1510 	imsg_free(&imsg);
1511 	return err;
1512 }
1513 
1514 const struct got_error *
1515 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1516     struct got_remote_repo *remotes, int nremotes)
1517 {
1518 	const struct got_error *err = NULL;
1519 	struct got_imsg_remotes iremotes;
1520 	int i;
1521 
1522 	iremotes.nremotes = nremotes;
1523 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1524 	    &iremotes, sizeof(iremotes)) == -1)
1525 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1526 
1527 	err = flush_imsg(ibuf);
1528 	imsg_clear(ibuf);
1529 	if (err)
1530 		return err;
1531 
1532 	for (i = 0; i < nremotes; i++) {
1533 		struct got_imsg_remote iremote;
1534 		size_t len = sizeof(iremote);
1535 		struct ibuf *wbuf;
1536 
1537 		iremote.name_len = strlen(remotes[i].name);
1538 		len += iremote.name_len;
1539 		iremote.url_len = strlen(remotes[i].url);
1540 		len += iremote.url_len;
1541 
1542 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1543 		if (wbuf == NULL)
1544 			return got_error_from_errno(
1545 			    "imsg_create GITCONFIG_REMOTE");
1546 
1547 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1548 			err = got_error_from_errno(
1549 			    "imsg_add GIITCONFIG_REMOTE");
1550 			ibuf_free(wbuf);
1551 			return err;
1552 		}
1553 
1554 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1555 			err = got_error_from_errno(
1556 			    "imsg_add GIITCONFIG_REMOTE");
1557 			ibuf_free(wbuf);
1558 			return err;
1559 		}
1560 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1561 			err = got_error_from_errno(
1562 			    "imsg_add GIITCONFIG_REMOTE");
1563 			ibuf_free(wbuf);
1564 			return err;
1565 		}
1566 
1567 		wbuf->fd = -1;
1568 		imsg_close(ibuf, wbuf);
1569 		err = flush_imsg(ibuf);
1570 		if (err)
1571 			return err;
1572 	}
1573 
1574 	return NULL;
1575 }
1576 
1577 const struct got_error *
1578 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1579     int *nremotes, struct imsgbuf *ibuf)
1580 {
1581 	const struct got_error *err = NULL;
1582 	struct imsg imsg;
1583 	size_t datalen;
1584 	struct got_imsg_remotes iremotes;
1585 	struct got_imsg_remote iremote;
1586 
1587 	*remotes = NULL;
1588 	*nremotes = 0;
1589 	iremotes.nremotes = 0;
1590 
1591 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
1592 	if (err)
1593 		return err;
1594 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1595 
1596 	switch (imsg.hdr.type) {
1597 	case GOT_IMSG_GITCONFIG_REMOTES:
1598 		if (datalen != sizeof(iremotes)) {
1599 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1600 			break;
1601 		}
1602 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
1603 		if (iremotes.nremotes == 0) {
1604 			imsg_free(&imsg);
1605 			return NULL;
1606 		}
1607 		break;
1608 	default:
1609 		imsg_free(&imsg);
1610 		return got_error(GOT_ERR_PRIVSEP_MSG);
1611 	}
1612 
1613 	imsg_free(&imsg);
1614 
1615 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(iremote));
1616 	if (*remotes == NULL)
1617 		return got_error_from_errno("recallocarray");
1618 
1619 	while (*nremotes < iremotes.nremotes) {
1620 		struct got_remote_repo *remote;
1621 	
1622 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
1623 		if (err)
1624 			break;
1625 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1626 
1627 		switch (imsg.hdr.type) {
1628 		case GOT_IMSG_GITCONFIG_REMOTE:
1629 			remote = &(*remotes)[*nremotes];
1630 			if (datalen < sizeof(iremote)) {
1631 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1632 				break;
1633 			}
1634 			memcpy(&iremote, imsg.data, sizeof(iremote));
1635 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
1636 			    (sizeof(iremote) + iremote.name_len +
1637 			    iremote.url_len) > datalen) {
1638 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1639 				break;
1640 			}
1641 			remote->name = strndup(imsg.data + sizeof(iremote),
1642 			    iremote.name_len);
1643 			if (remote->name == NULL) {
1644 				err = got_error_from_errno("strndup");
1645 				break;
1646 			}
1647 			remote->url = strndup(imsg.data + sizeof(iremote) +
1648 			    iremote.name_len, iremote.url_len);
1649 			if (remote->url == NULL) {
1650 				err = got_error_from_errno("strndup");
1651 				free(remote->name);
1652 				break;
1653 			}
1654 			(*nremotes)++;
1655 			break;
1656 		default:
1657 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1658 			break;
1659 		}
1660 
1661 		imsg_free(&imsg);
1662 		if (err)
1663 			break;
1664 	}
1665 
1666 	if (err) {
1667 		int i;
1668 		for (i = 0; i < *nremotes; i++) {
1669 			free((*remotes)[i].name);
1670 			free((*remotes)[i].url);
1671 		}
1672 		free(*remotes);
1673 		*remotes = NULL;
1674 		*nremotes = 0;
1675 	}
1676 	return err;
1677 }
1678 
1679 const struct got_error *
1680 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
1681      struct got_object_id *id, int idx, const char *path)
1682 {
1683 	const struct got_error *err = NULL;
1684 	struct ibuf *wbuf;
1685 	size_t path_len = strlen(path) + 1;
1686 
1687 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
1688 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
1689 	if (wbuf == NULL)
1690 		return got_error_from_errno(
1691 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
1692 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
1693 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
1694 		ibuf_free(wbuf);
1695 		return err;
1696 	}
1697 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
1698 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
1699 		ibuf_free(wbuf);
1700 		return err;
1701 	}
1702 	if (imsg_add(wbuf, path, path_len) == -1) {
1703 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
1704 		ibuf_free(wbuf);
1705 		return err;
1706 	}
1707 
1708 	wbuf->fd = -1;
1709 	imsg_close(ibuf, wbuf);
1710 
1711 	return flush_imsg(ibuf);
1712 }
1713 
1714 const struct got_error *
1715 got_privsep_send_traversed_commits(struct got_object_id *commit_ids, 
1716     size_t ncommits, struct imsgbuf *ibuf)
1717 {
1718 	const struct got_error *err;
1719 	struct ibuf *wbuf;
1720 	int i;
1721 
1722 	wbuf = imsg_create(ibuf, GOT_IMSG_TRAVERSED_COMMITS, 0, 0,
1723 	    sizeof(struct got_imsg_traversed_commits) +
1724 	    ncommits * SHA1_DIGEST_LENGTH);
1725 	if (wbuf == NULL)
1726 		return got_error_from_errno("imsg_create TRAVERSED_COMMITS");
1727 
1728 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1) {
1729 		err = got_error_from_errno("imsg_add TRAVERSED_COMMITS");
1730 		ibuf_free(wbuf);
1731 		return err;
1732 	}
1733 	for (i = 0; i < ncommits; i++) {
1734 		struct got_object_id *id = &commit_ids[i];
1735 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
1736 			err = got_error_from_errno(
1737 			    "imsg_add TRAVERSED_COMMITS");
1738 			ibuf_free(wbuf);
1739 			return err;
1740 		}
1741 	}
1742 
1743 	wbuf->fd = -1;
1744 	imsg_close(ibuf, wbuf);
1745 
1746 	return flush_imsg(ibuf);
1747 }
1748 
1749 const struct got_error *
1750 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
1751     struct got_object_id **changed_commit_id,
1752     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
1753 {
1754 	const struct got_error *err = NULL;
1755 	struct imsg imsg;
1756 	struct got_imsg_traversed_commits *icommits;
1757 	size_t datalen;
1758 	int i, done = 0;
1759 
1760 	*changed_commit = NULL;
1761 	*changed_commit_id = NULL;
1762 
1763 	while (!done) {
1764 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1765 		if (err)
1766 			return err;
1767 
1768 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1769 		switch (imsg.hdr.type) {
1770 		case GOT_IMSG_TRAVERSED_COMMITS:
1771 			icommits = imsg.data;
1772 			if (datalen != sizeof(*icommits) +
1773 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
1774 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1775 				break;
1776 			}
1777 			for (i = 0; i < icommits->ncommits; i++) {
1778 				struct got_object_qid *qid;
1779 				uint8_t *sha1 = (uint8_t *)imsg.data +
1780 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
1781 				err = got_object_qid_alloc_partial(&qid);
1782 				if (err)
1783 					break;
1784 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
1785 				SIMPLEQ_INSERT_TAIL(commit_ids, qid, entry);
1786 
1787 				/* The last commit may contain a change. */
1788 				if (i == icommits->ncommits - 1) {
1789 					*changed_commit_id =
1790 					    got_object_id_dup(qid->id);
1791 					if (*changed_commit_id == NULL) {
1792 						err = got_error_from_errno(
1793 						    "got_object_id_dup");
1794 						break;
1795 					}
1796 				}
1797 			}
1798 			break;
1799 		case GOT_IMSG_COMMIT:
1800 			if (*changed_commit_id == NULL) {
1801 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1802 				break;
1803 			}
1804 			err = get_commit_from_imsg(changed_commit, &imsg,
1805 			    datalen, ibuf);
1806 			break;
1807 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
1808 			done = 1;
1809 			break;
1810 		default:
1811 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1812 			break;
1813 		}
1814 
1815 		imsg_free(&imsg);
1816 		if (err)
1817 			break;
1818 	}
1819 
1820 	if (err)
1821 		got_object_id_queue_free(commit_ids);
1822 	return err;
1823 }
1824 
1825 const struct got_error *
1826 got_privsep_send_commit_traversal_done(struct imsgbuf *ibuf)
1827 {
1828 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_DONE, 0, 0, -1,
1829 	    NULL, 0) == -1)
1830 		return got_error_from_errno("imsg_compose TRAVERSAL_DONE");
1831 
1832 	return flush_imsg(ibuf);
1833 }
1834 
1835 const struct got_error *
1836 got_privsep_unveil_exec_helpers(void)
1837 {
1838 	const char *helpers[] = {
1839 	    GOT_PATH_PROG_READ_PACK,
1840 	    GOT_PATH_PROG_READ_OBJECT,
1841 	    GOT_PATH_PROG_READ_COMMIT,
1842 	    GOT_PATH_PROG_READ_TREE,
1843 	    GOT_PATH_PROG_READ_BLOB,
1844 	    GOT_PATH_PROG_READ_TAG,
1845 	    GOT_PATH_PROG_READ_GITCONFIG,
1846 	};
1847 	int i;
1848 
1849 	for (i = 0; i < nitems(helpers); i++) {
1850 		if (unveil(helpers[i], "x") == 0)
1851 			continue;
1852 		return got_error_from_errno2("unveil", helpers[i]);
1853 	}
1854 
1855 	return NULL;
1856 }
1857 
1858 void
1859 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
1860 {
1861 	if (close(imsg_fds[0]) != 0) {
1862 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1863 		_exit(1);
1864 	}
1865 
1866 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
1867 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1868 		_exit(1);
1869 	}
1870 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
1871 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1872 		_exit(1);
1873 	}
1874 
1875 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
1876 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
1877 		    strerror(errno));
1878 		_exit(1);
1879 	}
1880 }