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