Got Mirror

Blob

Date:: Wed Mar 18 16:10:31 2020 UTC
Message:: GOT_IMSG_ACK isn't needed; just fill the pipe, reading responses will block
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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_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 		return NULL;
442 	else
443 		return got_error(GOT_ERR_PRIVSEP_MSG);
444 	imsg_free(&imsg);
445 }
446 
447 
448 const struct got_error *
449 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, int fd, struct got_object_id hash)
450 {
451 	const struct got_error *err = NULL;
452 
453 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
454 	    hash.sha1, SHA1_DIGEST_LENGTH) == -1) {
455 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
456 		close(fd);
457 		return err;
458 	}
459 	return flush_imsg(ibuf);
460 }
461 
462 const struct got_error *
463 got_privsep_send_index_pack_done(struct imsgbuf *ibuf)
464 {
465 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_DONE, 0, 0, -1, NULL, 0) == -1)
466 		return got_error_from_errno("imsg_compose FETCH");
467 	return flush_imsg(ibuf);
468 }
469 
470 const struct got_error *
471 got_privsep_wait_index_pack_done(struct imsgbuf *ibuf)
472 {
473 	const struct got_error *err = NULL;
474 	struct imsg imsg;
475 
476 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
477 	if (err)
478 		return err;
479 	if (imsg.hdr.type == GOT_IMSG_IDXPACK_DONE)
480 		return NULL;
481 	else
482 		return got_error(GOT_ERR_PRIVSEP_MSG);
483 	imsg_free(&imsg);
484 }
485 
486 const struct got_error *
487 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
488     struct imsgbuf *ibuf)
489 {
490 	const struct got_error *err = NULL;
491 	struct got_imsg_object *iobj;
492 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
493 
494 	if (datalen != sizeof(*iobj))
495 		return got_error(GOT_ERR_PRIVSEP_LEN);
496 	iobj = imsg->data;
497 
498 	*obj = calloc(1, sizeof(**obj));
499 	if (*obj == NULL)
500 		return got_error_from_errno("calloc");
501 
502 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
503 	(*obj)->type = iobj->type;
504 	(*obj)->flags = iobj->flags;
505 	(*obj)->hdrlen = iobj->hdrlen;
506 	(*obj)->size = iobj->size;
507 	/* path_packfile is handled by caller */
508 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
509 		(*obj)->pack_offset = iobj->pack_offset;
510 		(*obj)->pack_idx = iobj->pack_idx;
511 	}
512 
513 	return err;
514 }
515 
516 const struct got_error *
517 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
518 {
519 	const struct got_error *err = NULL;
520 	struct imsg imsg;
521 	const size_t min_datalen =
522 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
523 
524 	*obj = NULL;
525 
526 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
527 	if (err)
528 		return err;
529 
530 	switch (imsg.hdr.type) {
531 	case GOT_IMSG_OBJECT:
532 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
533 		break;
534 	default:
535 		err = got_error(GOT_ERR_PRIVSEP_MSG);
536 		break;
537 	}
538 
539 	imsg_free(&imsg);
540 
541 	return err;
542 }
543 
544 static const struct got_error *
545 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
546     size_t logmsg_len)
547 {
548 	const struct got_error *err = NULL;
549 	size_t offset, remain;
550 
551 	offset = 0;
552 	remain = logmsg_len;
553 	while (remain > 0) {
554 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
555 
556 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
557 		    commit->logmsg + offset, n) == -1) {
558 			err = got_error_from_errno("imsg_compose "
559 			    "COMMIT_LOGMSG");
560 			break;
561 		}
562 
563 		err = flush_imsg(ibuf);
564 		if (err)
565 			break;
566 
567 		offset += n;
568 		remain -= n;
569 	}
570 
571 	return err;
572 }
573 
574 const struct got_error *
575 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
576 {
577 	const struct got_error *err = NULL;
578 	struct got_imsg_commit_object *icommit;
579 	uint8_t *buf;
580 	size_t len, total;
581 	struct got_object_qid *qid;
582 	size_t author_len = strlen(commit->author);
583 	size_t committer_len = strlen(commit->committer);
584 	size_t logmsg_len = strlen(commit->logmsg);
585 
586 	total = sizeof(*icommit) + author_len + committer_len +
587 	    commit->nparents * SHA1_DIGEST_LENGTH;
588 
589 	buf = malloc(total);
590 	if (buf == NULL)
591 		return got_error_from_errno("malloc");
592 
593 	icommit = (struct got_imsg_commit_object *)buf;
594 	memcpy(icommit->tree_id, commit->tree_id->sha1,
595 	    sizeof(icommit->tree_id));
596 	icommit->author_len = author_len;
597 	icommit->author_time = commit->author_time;
598 	icommit->author_gmtoff = commit->author_gmtoff;
599 	icommit->committer_len = committer_len;
600 	icommit->committer_time = commit->committer_time;
601 	icommit->committer_gmtoff = commit->committer_gmtoff;
602 	icommit->logmsg_len = logmsg_len;
603 	icommit->nparents = commit->nparents;
604 
605 	len = sizeof(*icommit);
606 	memcpy(buf + len, commit->author, author_len);
607 	len += author_len;
608 	memcpy(buf + len, commit->committer, committer_len);
609 	len += committer_len;
610 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
611 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
612 		len += SHA1_DIGEST_LENGTH;
613 	}
614 
615 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
616 		err = got_error_from_errno("imsg_compose COMMIT");
617 		goto done;
618 	}
619 
620 	if (logmsg_len == 0 ||
621 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
622 		err = flush_imsg(ibuf);
623 		if (err)
624 			goto done;
625 	}
626 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
627 done:
628 	free(buf);
629 	return err;
630 }
631 
632 static const struct got_error *
633 get_commit_from_imsg(struct got_commit_object **commit,
634     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
635 {
636 	const struct got_error *err = NULL;
637 	struct got_imsg_commit_object *icommit;
638 	size_t len = 0;
639 	int i;
640 
641 	if (datalen < sizeof(*icommit))
642 		return got_error(GOT_ERR_PRIVSEP_LEN);
643 
644 	icommit = imsg->data;
645 	if (datalen != sizeof(*icommit) + icommit->author_len +
646 	    icommit->committer_len +
647 	    icommit->nparents * SHA1_DIGEST_LENGTH)
648 		return got_error(GOT_ERR_PRIVSEP_LEN);
649 
650 	if (icommit->nparents < 0)
651 		return got_error(GOT_ERR_PRIVSEP_LEN);
652 
653 	len += sizeof(*icommit);
654 
655 	*commit = got_object_commit_alloc_partial();
656 	if (*commit == NULL)
657 		return got_error_from_errno(
658 		    "got_object_commit_alloc_partial");
659 
660 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
661 	    SHA1_DIGEST_LENGTH);
662 	(*commit)->author_time = icommit->author_time;
663 	(*commit)->author_gmtoff = icommit->author_gmtoff;
664 	(*commit)->committer_time = icommit->committer_time;
665 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
666 
667 	if (icommit->author_len == 0) {
668 		(*commit)->author = strdup("");
669 		if ((*commit)->author == NULL) {
670 			err = got_error_from_errno("strdup");
671 			goto done;
672 		}
673 	} else {
674 		(*commit)->author = malloc(icommit->author_len + 1);
675 		if ((*commit)->author == NULL) {
676 			err = got_error_from_errno("malloc");
677 			goto done;
678 		}
679 		memcpy((*commit)->author, imsg->data + len,
680 		    icommit->author_len);
681 		(*commit)->author[icommit->author_len] = '\0';
682 	}
683 	len += icommit->author_len;
684 
685 	if (icommit->committer_len == 0) {
686 		(*commit)->committer = strdup("");
687 		if ((*commit)->committer == NULL) {
688 			err = got_error_from_errno("strdup");
689 			goto done;
690 		}
691 	} else {
692 		(*commit)->committer =
693 		    malloc(icommit->committer_len + 1);
694 		if ((*commit)->committer == NULL) {
695 			err = got_error_from_errno("malloc");
696 			goto done;
697 		}
698 		memcpy((*commit)->committer, imsg->data + len,
699 		    icommit->committer_len);
700 		(*commit)->committer[icommit->committer_len] = '\0';
701 	}
702 	len += icommit->committer_len;
703 
704 	if (icommit->logmsg_len == 0) {
705 		(*commit)->logmsg = strdup("");
706 		if ((*commit)->logmsg == NULL) {
707 			err = got_error_from_errno("strdup");
708 			goto done;
709 		}
710 	} else {
711 		size_t offset = 0, remain = icommit->logmsg_len;
712 
713 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
714 		if ((*commit)->logmsg == NULL) {
715 			err = got_error_from_errno("malloc");
716 			goto done;
717 		}
718 		while (remain > 0) {
719 			struct imsg imsg_log;
720 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
721 			    remain);
722 
723 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
724 			if (err)
725 				goto done;
726 
727 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
728 				err = got_error(GOT_ERR_PRIVSEP_MSG);
729 				goto done;
730 			}
731 
732 			memcpy((*commit)->logmsg + offset,
733 			    imsg_log.data, n);
734 			imsg_free(&imsg_log);
735 			offset += n;
736 			remain -= n;
737 		}
738 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
739 	}
740 
741 	for (i = 0; i < icommit->nparents; i++) {
742 		struct got_object_qid *qid;
743 
744 		err = got_object_qid_alloc_partial(&qid);
745 		if (err)
746 			break;
747 		memcpy(qid->id, imsg->data + len +
748 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
749 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
750 		(*commit)->nparents++;
751 	}
752 done:
753 	if (err) {
754 		got_object_commit_close(*commit);
755 		*commit = NULL;
756 	}
757 	return err;
758 }
759 
760 const struct got_error *
761 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
762 {
763 	const struct got_error *err = NULL;
764 	struct imsg imsg;
765 	size_t datalen;
766 	const size_t min_datalen =
767 	    MIN(sizeof(struct got_imsg_error),
768 	    sizeof(struct got_imsg_commit_object));
769 
770 	*commit = NULL;
771 
772 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
773 	if (err)
774 		return err;
775 
776 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
777 
778 	switch (imsg.hdr.type) {
779 	case GOT_IMSG_COMMIT:
780 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
781 		break;
782 	default:
783 		err = got_error(GOT_ERR_PRIVSEP_MSG);
784 		break;
785 	}
786 
787 	imsg_free(&imsg);
788 
789 	return err;
790 }
791 
792 const struct got_error *
793 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
794     int nentries)
795 {
796 	const struct got_error *err = NULL;
797 	struct got_imsg_tree_object itree;
798 	struct got_pathlist_entry *pe;
799 	size_t totlen;
800 	int nimsg; /* number of imsg queued in ibuf */
801 
802 	itree.nentries = nentries;
803 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
804 	    == -1)
805 		return got_error_from_errno("imsg_compose TREE");
806 
807 	totlen = sizeof(itree);
808 	nimsg = 1;
809 	TAILQ_FOREACH(pe, entries, entry) {
810 		const char *name = pe->path;
811 		struct got_parsed_tree_entry *pte = pe->data;
812 		struct ibuf *wbuf;
813 		size_t namelen = strlen(name);
814 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
815 
816 		if (len > MAX_IMSGSIZE)
817 			return got_error(GOT_ERR_NO_SPACE);
818 
819 		nimsg++;
820 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
821 			err = flush_imsg(ibuf);
822 			if (err)
823 				return err;
824 			nimsg = 0;
825 		}
826 
827 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
828 		if (wbuf == NULL)
829 			return got_error_from_errno("imsg_create TREE_ENTRY");
830 
831 		/* Keep in sync with struct got_imsg_tree_object definition! */
832 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
833 			err = got_error_from_errno("imsg_add TREE_ENTRY");
834 			ibuf_free(wbuf);
835 			return err;
836 		}
837 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
838 			err = got_error_from_errno("imsg_add TREE_ENTRY");
839 			ibuf_free(wbuf);
840 			return err;
841 		}
842 
843 		if (imsg_add(wbuf, name, namelen) == -1) {
844 			err = got_error_from_errno("imsg_add TREE_ENTRY");
845 			ibuf_free(wbuf);
846 			return err;
847 		}
848 
849 		wbuf->fd = -1;
850 		imsg_close(ibuf, wbuf);
851 
852 		totlen += len;
853 	}
854 
855 	return flush_imsg(ibuf);
856 }
857 
858 const struct got_error *
859 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
860 {
861 	const struct got_error *err = NULL;
862 	const size_t min_datalen =
863 	    MIN(sizeof(struct got_imsg_error),
864 	    sizeof(struct got_imsg_tree_object));
865 	struct got_imsg_tree_object *itree;
866 	int nentries = 0;
867 
868 	*tree = NULL;
869 get_more:
870 	err = read_imsg(ibuf);
871 	if (err)
872 		goto done;
873 
874 	for (;;) {
875 		struct imsg imsg;
876 		size_t n;
877 		size_t datalen;
878 		struct got_imsg_tree_entry *ite;
879 		struct got_tree_entry *te = NULL;
880 
881 		n = imsg_get(ibuf, &imsg);
882 		if (n == 0) {
883 			if (*tree && (*tree)->nentries != nentries)
884 				goto get_more;
885 			break;
886 		}
887 
888 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
889 			return got_error(GOT_ERR_PRIVSEP_LEN);
890 
891 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
892 
893 		switch (imsg.hdr.type) {
894 		case GOT_IMSG_ERROR:
895 			err = recv_imsg_error(&imsg, datalen);
896 			break;
897 		case GOT_IMSG_TREE:
898 			/* This message should only appear once. */
899 			if (*tree != NULL) {
900 				err = got_error(GOT_ERR_PRIVSEP_MSG);
901 				break;
902 			}
903 			if (datalen != sizeof(*itree)) {
904 				err = got_error(GOT_ERR_PRIVSEP_LEN);
905 				break;
906 			}
907 			itree = imsg.data;
908 			*tree = malloc(sizeof(**tree));
909 			if (*tree == NULL) {
910 				err = got_error_from_errno("malloc");
911 				break;
912 			}
913 			(*tree)->entries = calloc(itree->nentries,
914 			    sizeof(struct got_tree_entry));
915 			if ((*tree)->entries == NULL) {
916 				err = got_error_from_errno("malloc");
917 				break;
918 			}
919 			(*tree)->nentries = itree->nentries;
920 			(*tree)->refcnt = 0;
921 			break;
922 		case GOT_IMSG_TREE_ENTRY:
923 			/* This message should be preceeded by GOT_IMSG_TREE. */
924 			if (*tree == NULL) {
925 				err = got_error(GOT_ERR_PRIVSEP_MSG);
926 				break;
927 			}
928 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
929 				err = got_error(GOT_ERR_PRIVSEP_LEN);
930 				break;
931 			}
932 
933 			/* Remaining data contains the entry's name. */
934 			datalen -= sizeof(*ite);
935 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
936 				err = got_error(GOT_ERR_PRIVSEP_LEN);
937 				break;
938 			}
939 			ite = imsg.data;
940 
941 			if (datalen + 1 > sizeof(te->name)) {
942 				err = got_error(GOT_ERR_NO_SPACE);
943 				break;
944 			}
945 			te = &(*tree)->entries[nentries];
946 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
947 			te->name[datalen] = '\0';
948 
949 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
950 			te->mode = ite->mode;
951 			te->idx = nentries;
952 			nentries++;
953 			break;
954 		default:
955 			err = got_error(GOT_ERR_PRIVSEP_MSG);
956 			break;
957 		}
958 
959 		imsg_free(&imsg);
960 	}
961 done:
962 	if (*tree && (*tree)->nentries != nentries) {
963 		if (err == NULL)
964 			err = got_error(GOT_ERR_PRIVSEP_LEN);
965 		got_object_tree_close(*tree);
966 		*tree = NULL;
967 	}
968 
969 	return err;
970 }
971 
972 const struct got_error *
973 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
974     const uint8_t *data)
975 {
976 	struct got_imsg_blob iblob;
977 
978 	iblob.size = size;
979 	iblob.hdrlen = hdrlen;
980 
981 	if (data) {
982 		uint8_t *buf;
983 
984 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
985 			return got_error(GOT_ERR_NO_SPACE);
986 
987 		buf = malloc(sizeof(iblob) + size);
988 		if (buf == NULL)
989 			return got_error_from_errno("malloc");
990 
991 		memcpy(buf, &iblob, sizeof(iblob));
992 		memcpy(buf + sizeof(iblob), data, size);
993 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
994 		   sizeof(iblob) + size) == -1) {
995 			free(buf);
996 			return got_error_from_errno("imsg_compose BLOB");
997 		}
998 		free(buf);
999 	} else {
1000 		/* Data has already been written to file descriptor. */
1001 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1002 		    sizeof(iblob)) == -1)
1003 			return got_error_from_errno("imsg_compose BLOB");
1004 	}
1005 
1006 
1007 	return flush_imsg(ibuf);
1008 }
1009 
1010 const struct got_error *
1011 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1012     struct imsgbuf *ibuf)
1013 {
1014 	const struct got_error *err = NULL;
1015 	struct imsg imsg;
1016 	struct got_imsg_blob *iblob;
1017 	size_t datalen;
1018 
1019 	*outbuf = NULL;
1020 
1021 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1022 	if (err)
1023 		return err;
1024 
1025 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1026 
1027 	switch (imsg.hdr.type) {
1028 	case GOT_IMSG_BLOB:
1029 		if (datalen < sizeof(*iblob)) {
1030 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1031 			break;
1032 		}
1033 		iblob = imsg.data;
1034 		*size = iblob->size;
1035 		*hdrlen = iblob->hdrlen;
1036 
1037 		if (datalen == sizeof(*iblob)) {
1038 			/* Data has been written to file descriptor. */
1039 			break;
1040 		}
1041 
1042 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1043 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1044 			break;
1045 		}
1046 
1047 		*outbuf = malloc(*size);
1048 		if (*outbuf == NULL) {
1049 			err = got_error_from_errno("malloc");
1050 			break;
1051 		}
1052 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1053 		break;
1054 	default:
1055 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1056 		break;
1057 	}
1058 
1059 	imsg_free(&imsg);
1060 
1061 	return err;
1062 }
1063 
1064 static const struct got_error *
1065 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1066 {
1067 	const struct got_error *err = NULL;
1068 	size_t offset, remain;
1069 
1070 	offset = 0;
1071 	remain = tagmsg_len;
1072 	while (remain > 0) {
1073 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1074 
1075 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1076 		    tag->tagmsg + offset, n) == -1) {
1077 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1078 			break;
1079 		}
1080 
1081 		err = flush_imsg(ibuf);
1082 		if (err)
1083 			break;
1084 
1085 		offset += n;
1086 		remain -= n;
1087 	}
1088 
1089 	return err;
1090 }
1091 
1092 const struct got_error *
1093 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1094 {
1095 	const struct got_error *err = NULL;
1096 	struct got_imsg_tag_object *itag;
1097 	uint8_t *buf;
1098 	size_t len, total;
1099 	size_t tag_len = strlen(tag->tag);
1100 	size_t tagger_len = strlen(tag->tagger);
1101 	size_t tagmsg_len = strlen(tag->tagmsg);
1102 
1103 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1104 
1105 	buf = malloc(total);
1106 	if (buf == NULL)
1107 		return got_error_from_errno("malloc");
1108 
1109 	itag = (struct got_imsg_tag_object *)buf;
1110 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1111 	itag->obj_type = tag->obj_type;
1112 	itag->tag_len = tag_len;
1113 	itag->tagger_len = tagger_len;
1114 	itag->tagger_time = tag->tagger_time;
1115 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1116 	itag->tagmsg_len = tagmsg_len;
1117 
1118 	len = sizeof(*itag);
1119 	memcpy(buf + len, tag->tag, tag_len);
1120 	len += tag_len;
1121 	memcpy(buf + len, tag->tagger, tagger_len);
1122 	len += tagger_len;
1123 
1124 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1125 		err = got_error_from_errno("imsg_compose TAG");
1126 		goto done;
1127 	}
1128 
1129 	if (tagmsg_len == 0 ||
1130 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1131 		err = flush_imsg(ibuf);
1132 		if (err)
1133 			goto done;
1134 	}
1135 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1136 done:
1137 	free(buf);
1138 	return err;
1139 }
1140 
1141 const struct got_error *
1142 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1143 {
1144 	const struct got_error *err = NULL;
1145 	struct imsg imsg;
1146 	struct got_imsg_tag_object *itag;
1147 	size_t len, datalen;
1148 	const size_t min_datalen =
1149 	    MIN(sizeof(struct got_imsg_error),
1150 	    sizeof(struct got_imsg_tag_object));
1151 
1152 	*tag = NULL;
1153 
1154 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1155 	if (err)
1156 		return err;
1157 
1158 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1159 	len = 0;
1160 
1161 	switch (imsg.hdr.type) {
1162 	case GOT_IMSG_TAG:
1163 		if (datalen < sizeof(*itag)) {
1164 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1165 			break;
1166 		}
1167 		itag = imsg.data;
1168 		if (datalen != sizeof(*itag) + itag->tag_len +
1169 		    itag->tagger_len) {
1170 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1171 			break;
1172 		}
1173 		len += sizeof(*itag);
1174 
1175 		*tag = calloc(1, sizeof(**tag));
1176 		if (*tag == NULL) {
1177 			err = got_error_from_errno("calloc");
1178 			break;
1179 		}
1180 
1181 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1182 
1183 		if (itag->tag_len == 0) {
1184 			(*tag)->tag = strdup("");
1185 			if ((*tag)->tag == NULL) {
1186 				err = got_error_from_errno("strdup");
1187 				break;
1188 			}
1189 		} else {
1190 			(*tag)->tag = malloc(itag->tag_len + 1);
1191 			if ((*tag)->tag == NULL) {
1192 				err = got_error_from_errno("malloc");
1193 				break;
1194 			}
1195 			memcpy((*tag)->tag, imsg.data + len,
1196 			    itag->tag_len);
1197 			(*tag)->tag[itag->tag_len] = '\0';
1198 		}
1199 		len += itag->tag_len;
1200 
1201 		(*tag)->obj_type = itag->obj_type;
1202 		(*tag)->tagger_time = itag->tagger_time;
1203 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1204 
1205 		if (itag->tagger_len == 0) {
1206 			(*tag)->tagger = strdup("");
1207 			if ((*tag)->tagger == NULL) {
1208 				err = got_error_from_errno("strdup");
1209 				break;
1210 			}
1211 		} else {
1212 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1213 			if ((*tag)->tagger == NULL) {
1214 				err = got_error_from_errno("malloc");
1215 				break;
1216 			}
1217 			memcpy((*tag)->tagger, imsg.data + len,
1218 			    itag->tagger_len);
1219 			(*tag)->tagger[itag->tagger_len] = '\0';
1220 		}
1221 		len += itag->tagger_len;
1222 
1223 		if (itag->tagmsg_len == 0) {
1224 			(*tag)->tagmsg = strdup("");
1225 			if ((*tag)->tagmsg == NULL) {
1226 				err = got_error_from_errno("strdup");
1227 				break;
1228 			}
1229 		} else {
1230 			size_t offset = 0, remain = itag->tagmsg_len;
1231 
1232 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1233 			if ((*tag)->tagmsg == NULL) {
1234 				err = got_error_from_errno("malloc");
1235 				break;
1236 			}
1237 			while (remain > 0) {
1238 				struct imsg imsg_log;
1239 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1240 				    remain);
1241 
1242 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1243 				if (err)
1244 					return err;
1245 
1246 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1247 					return got_error(GOT_ERR_PRIVSEP_MSG);
1248 
1249 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1250 				    n);
1251 				imsg_free(&imsg_log);
1252 				offset += n;
1253 				remain -= n;
1254 			}
1255 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1256 		}
1257 
1258 		break;
1259 	default:
1260 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1261 		break;
1262 	}
1263 
1264 	imsg_free(&imsg);
1265 
1266 	return err;
1267 }
1268 
1269 const struct got_error *
1270 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1271     struct got_packidx *packidx)
1272 {
1273 	const struct got_error *err = NULL;
1274 	struct got_imsg_packidx ipackidx;
1275 	struct got_imsg_pack ipack;
1276 	int fd;
1277 
1278 	ipackidx.len = packidx->len;
1279 	fd = dup(packidx->fd);
1280 	if (fd == -1)
1281 		return got_error_from_errno("dup");
1282 
1283 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1284 	    sizeof(ipackidx)) == -1) {
1285 		err = got_error_from_errno("imsg_compose PACKIDX");
1286 		close(fd);
1287 		return err;
1288 	}
1289 
1290 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1291 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1292 		return got_error(GOT_ERR_NO_SPACE);
1293 	ipack.filesize = pack->filesize;
1294 
1295 	fd = dup(pack->fd);
1296 	if (fd == -1)
1297 		return got_error_from_errno("dup");
1298 
1299 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1300 	    == -1) {
1301 		err = got_error_from_errno("imsg_compose PACK");
1302 		close(fd);
1303 		return err;
1304 	}
1305 
1306 	return flush_imsg(ibuf);
1307 }
1308 
1309 const struct got_error *
1310 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1311     struct got_object_id *id)
1312 {
1313 	struct got_imsg_packed_object iobj;
1314 
1315 	iobj.idx = idx;
1316 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1317 
1318 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1319 	    &iobj, sizeof(iobj)) == -1)
1320 		return got_error_from_errno("imsg_compose "
1321 		    "PACKED_OBJECT_REQUEST");
1322 
1323 	return flush_imsg(ibuf);
1324 }
1325 
1326 const struct got_error *
1327 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1328 {
1329 	const struct got_error *err = NULL;
1330 
1331 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1332 	    NULL, 0) == -1) {
1333 		err = got_error_from_errno("imsg_compose "
1334 		    "GITCONFIG_PARSE_REQUEST");
1335 		close(fd);
1336 		return err;
1337 	}
1338 
1339 	return flush_imsg(ibuf);
1340 }
1341 
1342 const struct got_error *
1343 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1344 {
1345 	if (imsg_compose(ibuf,
1346 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1347 	    NULL, 0) == -1)
1348 		return got_error_from_errno("imsg_compose "
1349 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1350 
1351 	return flush_imsg(ibuf);
1352 }
1353 
1354 const struct got_error *
1355 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1356 {
1357 	if (imsg_compose(ibuf,
1358 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1359 		return got_error_from_errno("imsg_compose "
1360 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1361 
1362 	return flush_imsg(ibuf);
1363 }
1364 
1365 const struct got_error *
1366 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1367 {
1368 	if (imsg_compose(ibuf,
1369 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1370 		return got_error_from_errno("imsg_compose "
1371 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1372 
1373 	return flush_imsg(ibuf);
1374 }
1375 
1376 const struct got_error *
1377 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1378 {
1379 	if (imsg_compose(ibuf,
1380 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1381 		return got_error_from_errno("imsg_compose "
1382 		    "GITCONFIG_REMOTE_REQUEST");
1383 
1384 	return flush_imsg(ibuf);
1385 }
1386 
1387 const struct got_error *
1388 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
1389 {
1390 	if (imsg_compose(ibuf,
1391 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
1392 		return got_error_from_errno("imsg_compose "
1393 		    "GITCONFIG_OWNER_REQUEST");
1394 
1395 	return flush_imsg(ibuf);
1396 }
1397 
1398 const struct got_error *
1399 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1400 {
1401 	size_t len = value ? strlen(value) + 1 : 0;
1402 
1403 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1404 	    value, len) == -1)
1405 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1406 
1407 	return flush_imsg(ibuf);
1408 }
1409 
1410 const struct got_error *
1411 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1412 {
1413 	const struct got_error *err = NULL;
1414 	struct imsg imsg;
1415 	size_t datalen;
1416 	const size_t min_datalen = 0;
1417 
1418 	*str = NULL;
1419 
1420 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1421 	if (err)
1422 		return err;
1423 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1424 
1425 	switch (imsg.hdr.type) {
1426 	case GOT_IMSG_GITCONFIG_STR_VAL:
1427 		if (datalen == 0)
1428 			break;
1429 		*str = malloc(datalen);
1430 		if (*str == NULL) {
1431 			err = got_error_from_errno("malloc");
1432 			break;
1433 		}
1434 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1435 			err = got_error(GOT_ERR_NO_SPACE);
1436 		break;
1437 	default:
1438 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1439 		break;
1440 	}
1441 
1442 	imsg_free(&imsg);
1443 	return err;
1444 }
1445 
1446 const struct got_error *
1447 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1448 {
1449 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1450 	    &value, sizeof(value)) == -1)
1451 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1452 
1453 	return flush_imsg(ibuf);
1454 }
1455 
1456 const struct got_error *
1457 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1458 {
1459 	const struct got_error *err = NULL;
1460 	struct imsg imsg;
1461 	size_t datalen;
1462 	const size_t min_datalen =
1463 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1464 
1465 	*val = 0;
1466 
1467 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1468 	if (err)
1469 		return err;
1470 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1471 
1472 	switch (imsg.hdr.type) {
1473 	case GOT_IMSG_GITCONFIG_INT_VAL:
1474 		if (datalen != sizeof(*val)) {
1475 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1476 			break;
1477 		}
1478 		memcpy(val, imsg.data, sizeof(*val));
1479 		break;
1480 	default:
1481 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1482 		break;
1483 	}
1484 
1485 	imsg_free(&imsg);
1486 	return err;
1487 }
1488 
1489 const struct got_error *
1490 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1491     struct got_remote_repo *remotes, int nremotes)
1492 {
1493 	const struct got_error *err = NULL;
1494 	struct got_imsg_remotes iremotes;
1495 	int i;
1496 
1497 	iremotes.nremotes = nremotes;
1498 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1499 	    &iremotes, sizeof(iremotes)) == -1)
1500 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1501 
1502 	err = flush_imsg(ibuf);
1503 	imsg_clear(ibuf);
1504 	if (err)
1505 		return err;
1506 
1507 	for (i = 0; i < nremotes; i++) {
1508 		struct got_imsg_remote iremote;
1509 		size_t len = sizeof(iremote);
1510 		struct ibuf *wbuf;
1511 
1512 		iremote.name_len = strlen(remotes[i].name);
1513 		len += iremote.name_len;
1514 		iremote.url_len = strlen(remotes[i].url);
1515 		len += iremote.url_len;
1516 
1517 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1518 		if (wbuf == NULL)
1519 			return got_error_from_errno(
1520 			    "imsg_create GITCONFIG_REMOTE");
1521 
1522 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1523 			err = got_error_from_errno(
1524 			    "imsg_add GIITCONFIG_REMOTE");
1525 			ibuf_free(wbuf);
1526 			return err;
1527 		}
1528 
1529 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1530 			err = got_error_from_errno(
1531 			    "imsg_add GIITCONFIG_REMOTE");
1532 			ibuf_free(wbuf);
1533 			return err;
1534 		}
1535 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1536 			err = got_error_from_errno(
1537 			    "imsg_add GIITCONFIG_REMOTE");
1538 			ibuf_free(wbuf);
1539 			return err;
1540 		}
1541 
1542 		wbuf->fd = -1;
1543 		imsg_close(ibuf, wbuf);
1544 		err = flush_imsg(ibuf);
1545 		if (err)
1546 			return err;
1547 	}
1548 
1549 	return NULL;
1550 }
1551 
1552 const struct got_error *
1553 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1554     int *nremotes, struct imsgbuf *ibuf)
1555 {
1556 	const struct got_error *err = NULL;
1557 	struct imsg imsg;
1558 	size_t datalen;
1559 	struct got_imsg_remotes iremotes;
1560 	struct got_imsg_remote iremote;
1561 
1562 	*remotes = NULL;
1563 	*nremotes = 0;
1564 	iremotes.nremotes = 0;
1565 
1566 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
1567 	if (err)
1568 		return err;
1569 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1570 
1571 	switch (imsg.hdr.type) {
1572 	case GOT_IMSG_GITCONFIG_REMOTES:
1573 		if (datalen != sizeof(iremotes)) {
1574 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1575 			break;
1576 		}
1577 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
1578 		if (iremotes.nremotes == 0) {
1579 			imsg_free(&imsg);
1580 			return NULL;
1581 		}
1582 		break;
1583 	default:
1584 		imsg_free(&imsg);
1585 		return got_error(GOT_ERR_PRIVSEP_MSG);
1586 	}
1587 
1588 	imsg_free(&imsg);
1589 
1590 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(iremote));
1591 	if (*remotes == NULL)
1592 		return got_error_from_errno("recallocarray");
1593 
1594 	while (*nremotes < iremotes.nremotes) {
1595 		struct got_remote_repo *remote;
1596 	
1597 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
1598 		if (err)
1599 			break;
1600 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1601 
1602 		switch (imsg.hdr.type) {
1603 		case GOT_IMSG_GITCONFIG_REMOTE:
1604 			remote = &(*remotes)[*nremotes];
1605 			if (datalen < sizeof(iremote)) {
1606 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1607 				break;
1608 			}
1609 			memcpy(&iremote, imsg.data, sizeof(iremote));
1610 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
1611 			    (sizeof(iremote) + iremote.name_len +
1612 			    iremote.url_len) > datalen) {
1613 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1614 				break;
1615 			}
1616 			remote->name = strndup(imsg.data + sizeof(iremote),
1617 			    iremote.name_len);
1618 			if (remote->name == NULL) {
1619 				err = got_error_from_errno("strndup");
1620 				break;
1621 			}
1622 			remote->url = strndup(imsg.data + sizeof(iremote) +
1623 			    iremote.name_len, iremote.url_len);
1624 			if (remote->url == NULL) {
1625 				err = got_error_from_errno("strndup");
1626 				free(remote->name);
1627 				break;
1628 			}
1629 			(*nremotes)++;
1630 			break;
1631 		default:
1632 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1633 			break;
1634 		}
1635 
1636 		imsg_free(&imsg);
1637 		if (err)
1638 			break;
1639 	}
1640 
1641 	if (err) {
1642 		int i;
1643 		for (i = 0; i < *nremotes; i++) {
1644 			free((*remotes)[i].name);
1645 			free((*remotes)[i].url);
1646 		}
1647 		free(*remotes);
1648 		*remotes = NULL;
1649 		*nremotes = 0;
1650 	}
1651 	return err;
1652 }
1653 
1654 const struct got_error *
1655 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
1656      struct got_object_id *id, int idx, const char *path)
1657 {
1658 	const struct got_error *err = NULL;
1659 	struct ibuf *wbuf;
1660 	size_t path_len = strlen(path) + 1;
1661 
1662 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
1663 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
1664 	if (wbuf == NULL)
1665 		return got_error_from_errno(
1666 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
1667 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
1668 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
1669 		ibuf_free(wbuf);
1670 		return err;
1671 	}
1672 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
1673 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
1674 		ibuf_free(wbuf);
1675 		return err;
1676 	}
1677 	if (imsg_add(wbuf, path, path_len) == -1) {
1678 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
1679 		ibuf_free(wbuf);
1680 		return err;
1681 	}
1682 
1683 	wbuf->fd = -1;
1684 	imsg_close(ibuf, wbuf);
1685 
1686 	return flush_imsg(ibuf);
1687 }
1688 
1689 const struct got_error *
1690 got_privsep_send_traversed_commits(struct got_object_id *commit_ids, 
1691     size_t ncommits, struct imsgbuf *ibuf)
1692 {
1693 	const struct got_error *err;
1694 	struct ibuf *wbuf;
1695 	int i;
1696 
1697 	wbuf = imsg_create(ibuf, GOT_IMSG_TRAVERSED_COMMITS, 0, 0,
1698 	    sizeof(struct got_imsg_traversed_commits) +
1699 	    ncommits * SHA1_DIGEST_LENGTH);
1700 	if (wbuf == NULL)
1701 		return got_error_from_errno("imsg_create TRAVERSED_COMMITS");
1702 
1703 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1) {
1704 		err = got_error_from_errno("imsg_add TRAVERSED_COMMITS");
1705 		ibuf_free(wbuf);
1706 		return err;
1707 	}
1708 	for (i = 0; i < ncommits; i++) {
1709 		struct got_object_id *id = &commit_ids[i];
1710 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
1711 			err = got_error_from_errno(
1712 			    "imsg_add TRAVERSED_COMMITS");
1713 			ibuf_free(wbuf);
1714 			return err;
1715 		}
1716 	}
1717 
1718 	wbuf->fd = -1;
1719 	imsg_close(ibuf, wbuf);
1720 
1721 	return flush_imsg(ibuf);
1722 }
1723 
1724 const struct got_error *
1725 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
1726     struct got_object_id **changed_commit_id,
1727     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
1728 {
1729 	const struct got_error *err = NULL;
1730 	struct imsg imsg;
1731 	struct got_imsg_traversed_commits *icommits;
1732 	size_t datalen;
1733 	int i, done = 0;
1734 
1735 	*changed_commit = NULL;
1736 	*changed_commit_id = NULL;
1737 
1738 	while (!done) {
1739 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1740 		if (err)
1741 			return err;
1742 
1743 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1744 		switch (imsg.hdr.type) {
1745 		case GOT_IMSG_TRAVERSED_COMMITS:
1746 			icommits = imsg.data;
1747 			if (datalen != sizeof(*icommits) +
1748 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
1749 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1750 				break;
1751 			}
1752 			for (i = 0; i < icommits->ncommits; i++) {
1753 				struct got_object_qid *qid;
1754 				uint8_t *sha1 = (uint8_t *)imsg.data +
1755 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
1756 				err = got_object_qid_alloc_partial(&qid);
1757 				if (err)
1758 					break;
1759 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
1760 				SIMPLEQ_INSERT_TAIL(commit_ids, qid, entry);
1761 
1762 				/* The last commit may contain a change. */
1763 				if (i == icommits->ncommits - 1) {
1764 					*changed_commit_id =
1765 					    got_object_id_dup(qid->id);
1766 					if (*changed_commit_id == NULL) {
1767 						err = got_error_from_errno(
1768 						    "got_object_id_dup");
1769 						break;
1770 					}
1771 				}
1772 			}
1773 			break;
1774 		case GOT_IMSG_COMMIT:
1775 			if (*changed_commit_id == NULL) {
1776 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1777 				break;
1778 			}
1779 			err = get_commit_from_imsg(changed_commit, &imsg,
1780 			    datalen, ibuf);
1781 			break;
1782 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
1783 			done = 1;
1784 			break;
1785 		default:
1786 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1787 			break;
1788 		}
1789 
1790 		imsg_free(&imsg);
1791 		if (err)
1792 			break;
1793 	}
1794 
1795 	if (err)
1796 		got_object_id_queue_free(commit_ids);
1797 	return err;
1798 }
1799 
1800 const struct got_error *
1801 got_privsep_send_commit_traversal_done(struct imsgbuf *ibuf)
1802 {
1803 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_DONE, 0, 0, -1,
1804 	    NULL, 0) == -1)
1805 		return got_error_from_errno("imsg_compose TRAVERSAL_DONE");
1806 
1807 	return flush_imsg(ibuf);
1808 }
1809 
1810 const struct got_error *
1811 got_privsep_unveil_exec_helpers(void)
1812 {
1813 	const char *helpers[] = {
1814 	    GOT_PATH_PROG_READ_PACK,
1815 	    GOT_PATH_PROG_READ_OBJECT,
1816 	    GOT_PATH_PROG_READ_COMMIT,
1817 	    GOT_PATH_PROG_READ_TREE,
1818 	    GOT_PATH_PROG_READ_BLOB,
1819 	    GOT_PATH_PROG_READ_TAG,
1820 	    GOT_PATH_PROG_READ_GITCONFIG,
1821 	};
1822 	int i;
1823 
1824 	for (i = 0; i < nitems(helpers); i++) {
1825 		if (unveil(helpers[i], "x") == 0)
1826 			continue;
1827 		return got_error_from_errno2("unveil", helpers[i]);
1828 	}
1829 
1830 	return NULL;
1831 }
1832 
1833 void
1834 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
1835 {
1836 	if (close(imsg_fds[0]) != 0) {
1837 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1838 		_exit(1);
1839 	}
1840 
1841 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
1842 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1843 		_exit(1);
1844 	}
1845 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
1846 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1847 		_exit(1);
1848 	}
1849 
1850 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
1851 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
1852 		    strerror(errno));
1853 		_exit(1);
1854 	}
1855 }