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Date:: Fri Nov 29 02:46:04 2019 UTC
Message:: parse remotes from gitconfig
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1 /*
2  * Copyright (c) 2018, 2019 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/syslimits.h>
21 #include <sys/wait.h>
22 
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <errno.h>
27 #include <stdint.h>
28 #include <poll.h>
29 #include <imsg.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <time.h>
33 
34 #include "got_object.h"
35 #include "got_error.h"
36 #include "got_path.h"
37 #include "got_repository.h"
38 
39 #include "got_lib_sha1.h"
40 #include "got_lib_delta.h"
41 #include "got_lib_inflate.h"
42 #include "got_lib_object.h"
43 #include "got_lib_object_parse.h"
44 #include "got_lib_privsep.h"
45 #include "got_lib_pack.h"
46 
47 #ifndef MIN
48 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
49 #endif
50 
51 #ifndef nitems
52 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
53 #endif
54 
55 static const struct got_error *
56 poll_fd(int fd, int events, int timeout)
57 {
58 	struct pollfd pfd[1];
59 	int n;
60 
61 	pfd[0].fd = fd;
62 	pfd[0].events = events;
63 
64 	n = poll(pfd, 1, timeout);
65 	if (n == -1)
66 		return got_error_from_errno("poll");
67 	if (n == 0)
68 		return got_error(GOT_ERR_TIMEOUT);
69 	if (pfd[0].revents & (POLLERR | POLLNVAL))
70 		return got_error_from_errno("poll error");
71 	if (pfd[0].revents & (events | POLLHUP))
72 		return NULL;
73 
74 	return got_error(GOT_ERR_INTERRUPT);
75 }
76 
77 static const struct got_error *
78 read_imsg(struct imsgbuf *ibuf)
79 {
80 	const struct got_error *err;
81 	size_t n;
82 
83 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
84 	if (err)
85 		return err;
86 
87 	n = imsg_read(ibuf);
88 	if (n == -1) {
89 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
90 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
91 		return got_error(GOT_ERR_PRIVSEP_READ);
92 	}
93 	if (n == 0)
94 		return got_error(GOT_ERR_PRIVSEP_PIPE);
95 
96 	return NULL;
97 }
98 
99 const struct got_error *
100 got_privsep_wait_for_child(pid_t pid)
101 {
102 	int child_status;
103 
104 	if (waitpid(pid, &child_status, 0) == -1)
105 		return got_error_from_errno("waitpid");
106 
107 	if (!WIFEXITED(child_status))
108 		return got_error(GOT_ERR_PRIVSEP_DIED);
109 
110 	if (WEXITSTATUS(child_status) != 0)
111 		return got_error(GOT_ERR_PRIVSEP_EXIT);
112 
113 	return NULL;
114 }
115 
116 static const struct got_error *
117 recv_imsg_error(struct imsg *imsg, size_t datalen)
118 {
119 	struct got_imsg_error *ierr;
120 
121 	if (datalen != sizeof(*ierr))
122 		return got_error(GOT_ERR_PRIVSEP_LEN);
123 
124 	ierr = imsg->data;
125 	if (ierr->code == GOT_ERR_ERRNO) {
126 		static struct got_error serr;
127 		serr.code = GOT_ERR_ERRNO;
128 		serr.msg = strerror(ierr->errno_code);
129 		return &serr;
130 	}
131 
132 	return got_error(ierr->code);
133 }
134 
135 const struct got_error *
136 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
137     size_t min_datalen)
138 {
139 	const struct got_error *err;
140 	ssize_t n;
141 
142 	n = imsg_get(ibuf, imsg);
143 	if (n == -1)
144 		return got_error_from_errno("imsg_get");
145 
146 	while (n == 0) {
147 		err = read_imsg(ibuf);
148 		if (err)
149 			return err;
150 		n = imsg_get(ibuf, imsg);
151 	}
152 
153 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
154 		return got_error(GOT_ERR_PRIVSEP_LEN);
155 
156 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
157 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
158 		return recv_imsg_error(imsg, datalen);
159 	}
160 
161 	return NULL;
162 }
163 
164 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
165 void
166 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
167 {
168 	const struct got_error *poll_err;
169 	struct got_imsg_error ierr;
170 	int ret;
171 
172 	ierr.code = err->code;
173 	if (err->code == GOT_ERR_ERRNO)
174 		ierr.errno_code = errno;
175 	else
176 		ierr.errno_code = 0;
177 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
178 	if (ret == -1) {
179 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
180 		    getprogname(), err->code, err->msg, strerror(errno));
181 		return;
182 	}
183 
184 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
185 	if (poll_err) {
186 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
187 		    getprogname(), err->code, err->msg, poll_err->msg);
188 		return;
189 	}
190 
191 	ret = imsg_flush(ibuf);
192 	if (ret == -1) {
193 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
194 		    getprogname(), err->code, err->msg, strerror(errno));
195 		return;
196 	}
197 }
198 
199 static const struct got_error *
200 flush_imsg(struct imsgbuf *ibuf)
201 {
202 	const struct got_error *err;
203 
204 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
205 	if (err)
206 		return err;
207 
208 	if (imsg_flush(ibuf) == -1)
209 		return got_error_from_errno("imsg_flush");
210 
211 	return NULL;
212 }
213 
214 const struct got_error *
215 got_privsep_send_stop(int fd)
216 {
217 	const struct got_error *err = NULL;
218 	struct imsgbuf ibuf;
219 
220 	imsg_init(&ibuf, fd);
221 
222 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
223 		return got_error_from_errno("imsg_compose STOP");
224 
225 	err = flush_imsg(&ibuf);
226 	imsg_clear(&ibuf);
227 	return err;
228 }
229 
230 const struct got_error *
231 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd)
232 {
233 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd, NULL, 0)
234 	    == -1)
235 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
236 
237 	return flush_imsg(ibuf);
238 }
239 
240 const struct got_error *
241 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
242     struct got_object_id *id, int pack_idx)
243 {
244 	const struct got_error *err = NULL;
245 	struct got_imsg_packed_object iobj, *iobjp;
246 	size_t len;
247 
248 	if (id) { /* commit is packed */
249 		iobj.idx = pack_idx;
250 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
251 		iobjp = &iobj;
252 		len = sizeof(iobj);
253 	} else {
254 		iobjp = NULL;
255 		len = 0;
256 	}
257 
258 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, iobjp, len)
259 	    == -1) {
260 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
261 		close(fd);
262 		return err;
263 	}
264 
265 	return flush_imsg(ibuf);
266 }
267 
268 const struct got_error *
269 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
270     struct got_object_id *id, int pack_idx)
271 {
272 	const struct got_error *err = NULL;
273 	struct ibuf *wbuf;
274 	size_t len = id ? sizeof(struct got_imsg_packed_object) : 0;
275 
276 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
277 	if (wbuf == NULL)
278 		return got_error_from_errno("imsg_create TREE_REQUEST");
279 
280 	if (id) { /* tree is packed */
281 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
282 			err = got_error_from_errno("imsg_add TREE_ENTRY");
283 			ibuf_free(wbuf);
284 			return err;
285 		}
286 
287 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1) {
288 			err = got_error_from_errno("imsg_add TREE_ENTRY");
289 			ibuf_free(wbuf);
290 			return err;
291 		}
292 	}
293 
294 	wbuf->fd = fd;
295 	imsg_close(ibuf, wbuf);
296 
297 	return flush_imsg(ibuf);
298 }
299 
300 const struct got_error *
301 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
302     struct got_object_id *id, int pack_idx)
303 {
304 	struct got_imsg_packed_object iobj, *iobjp;
305 	size_t len;
306 
307 	if (id) { /* tag is packed */
308 		iobj.idx = pack_idx;
309 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
310 		iobjp = &iobj;
311 		len = sizeof(iobj);
312 	} else {
313 		iobjp = NULL;
314 		len = 0;
315 	}
316 
317 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, iobjp, len)
318 	    == -1)
319 		return got_error_from_errno("imsg_compose TAG_REQUEST");
320 
321 	return flush_imsg(ibuf);
322 }
323 
324 const struct got_error *
325 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
326     struct got_object_id *id, int pack_idx)
327 {
328 	const struct got_error *err = NULL;
329 	struct got_imsg_packed_object iobj, *iobjp;
330 	size_t len;
331 
332 	if (id) { /* blob is packed */
333 		iobj.idx = pack_idx;
334 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
335 		iobjp = &iobj;
336 		len = sizeof(iobj);
337 	} else {
338 		iobjp = NULL;
339 		len = 0;
340 	}
341 
342 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, iobjp, len)
343 	    == -1) {
344 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
345 		close(infd);
346 		return err;
347 	}
348 
349 	return flush_imsg(ibuf);
350 }
351 
352 const struct got_error *
353 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
354 {
355 	const struct got_error *err = NULL;
356 
357 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
358 	    == -1) {
359 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
360 		close(outfd);
361 		return err;
362 	}
363 
364 	return flush_imsg(ibuf);
365 }
366 
367 const struct got_error *
368 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
369 {
370 	const struct got_error *err = NULL;
371 
372 	if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
373 	    == -1) {
374 		err = got_error_from_errno("imsg_compose TMPFD");
375 		close(fd);
376 		return err;
377 	}
378 
379 	return flush_imsg(ibuf);
380 }
381 
382 const struct got_error *
383 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
384 {
385 	struct got_imsg_object iobj;
386 
387 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
388 	iobj.type = obj->type;
389 	iobj.flags = obj->flags;
390 	iobj.hdrlen = obj->hdrlen;
391 	iobj.size = obj->size;
392 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
393 		iobj.pack_offset = obj->pack_offset;
394 		iobj.pack_idx = obj->pack_idx;
395 	}
396 
397 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
398 	    == -1)
399 		return got_error_from_errno("imsg_compose OBJECT");
400 
401 	return flush_imsg(ibuf);
402 }
403 
404 const struct got_error *
405 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
406     struct imsgbuf *ibuf)
407 {
408 	const struct got_error *err = NULL;
409 	struct got_imsg_object *iobj;
410 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
411 
412 	if (datalen != sizeof(*iobj))
413 		return got_error(GOT_ERR_PRIVSEP_LEN);
414 	iobj = imsg->data;
415 
416 	*obj = calloc(1, sizeof(**obj));
417 	if (*obj == NULL)
418 		return got_error_from_errno("calloc");
419 
420 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
421 	(*obj)->type = iobj->type;
422 	(*obj)->flags = iobj->flags;
423 	(*obj)->hdrlen = iobj->hdrlen;
424 	(*obj)->size = iobj->size;
425 	/* path_packfile is handled by caller */
426 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
427 		(*obj)->pack_offset = iobj->pack_offset;
428 		(*obj)->pack_idx = iobj->pack_idx;
429 	}
430 
431 	return err;
432 }
433 
434 const struct got_error *
435 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
436 {
437 	const struct got_error *err = NULL;
438 	struct imsg imsg;
439 	const size_t min_datalen =
440 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
441 
442 	*obj = NULL;
443 
444 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
445 	if (err)
446 		return err;
447 
448 	switch (imsg.hdr.type) {
449 	case GOT_IMSG_OBJECT:
450 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
451 		break;
452 	default:
453 		err = got_error(GOT_ERR_PRIVSEP_MSG);
454 		break;
455 	}
456 
457 	imsg_free(&imsg);
458 
459 	return err;
460 }
461 
462 static const struct got_error *
463 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
464     size_t logmsg_len)
465 {
466 	const struct got_error *err = NULL;
467 	size_t offset, remain;
468 
469 	offset = 0;
470 	remain = logmsg_len;
471 	while (remain > 0) {
472 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
473 
474 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
475 		    commit->logmsg + offset, n) == -1) {
476 			err = got_error_from_errno("imsg_compose "
477 			    "COMMIT_LOGMSG");
478 			break;
479 		}
480 
481 		err = flush_imsg(ibuf);
482 		if (err)
483 			break;
484 
485 		offset += n;
486 		remain -= n;
487 	}
488 
489 	return err;
490 }
491 
492 const struct got_error *
493 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
494 {
495 	const struct got_error *err = NULL;
496 	struct got_imsg_commit_object *icommit;
497 	uint8_t *buf;
498 	size_t len, total;
499 	struct got_object_qid *qid;
500 	size_t author_len = strlen(commit->author);
501 	size_t committer_len = strlen(commit->committer);
502 	size_t logmsg_len = strlen(commit->logmsg);
503 
504 	total = sizeof(*icommit) + author_len + committer_len +
505 	    commit->nparents * SHA1_DIGEST_LENGTH;
506 
507 	buf = malloc(total);
508 	if (buf == NULL)
509 		return got_error_from_errno("malloc");
510 
511 	icommit = (struct got_imsg_commit_object *)buf;
512 	memcpy(icommit->tree_id, commit->tree_id->sha1,
513 	    sizeof(icommit->tree_id));
514 	icommit->author_len = author_len;
515 	icommit->author_time = commit->author_time;
516 	icommit->author_gmtoff = commit->author_gmtoff;
517 	icommit->committer_len = committer_len;
518 	icommit->committer_time = commit->committer_time;
519 	icommit->committer_gmtoff = commit->committer_gmtoff;
520 	icommit->logmsg_len = logmsg_len;
521 	icommit->nparents = commit->nparents;
522 
523 	len = sizeof(*icommit);
524 	memcpy(buf + len, commit->author, author_len);
525 	len += author_len;
526 	memcpy(buf + len, commit->committer, committer_len);
527 	len += committer_len;
528 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
529 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
530 		len += SHA1_DIGEST_LENGTH;
531 	}
532 
533 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
534 		err = got_error_from_errno("imsg_compose COMMIT");
535 		goto done;
536 	}
537 
538 	if (logmsg_len == 0 ||
539 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
540 		err = flush_imsg(ibuf);
541 		if (err)
542 			goto done;
543 	}
544 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
545 done:
546 	free(buf);
547 	return err;
548 }
549 
550 const struct got_error *
551 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
552 {
553 	const struct got_error *err = NULL;
554 	struct imsg imsg;
555 	struct got_imsg_commit_object *icommit;
556 	size_t len, datalen;
557 	int i;
558 	const size_t min_datalen =
559 	    MIN(sizeof(struct got_imsg_error),
560 	    sizeof(struct got_imsg_commit_object));
561 
562 	*commit = NULL;
563 
564 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
565 	if (err)
566 		return err;
567 
568 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
569 	len = 0;
570 
571 	switch (imsg.hdr.type) {
572 	case GOT_IMSG_COMMIT:
573 		if (datalen < sizeof(*icommit)) {
574 			err = got_error(GOT_ERR_PRIVSEP_LEN);
575 			break;
576 		}
577 		icommit = imsg.data;
578 		if (datalen != sizeof(*icommit) + icommit->author_len +
579 		    icommit->committer_len +
580 		    icommit->nparents * SHA1_DIGEST_LENGTH) {
581 			err = got_error(GOT_ERR_PRIVSEP_LEN);
582 			break;
583 		}
584 		if (icommit->nparents < 0) {
585 			err = got_error(GOT_ERR_PRIVSEP_LEN);
586 			break;
587 		}
588 		len += sizeof(*icommit);
589 
590 		*commit = got_object_commit_alloc_partial();
591 		if (*commit == NULL) {
592 			err = got_error_from_errno(
593 			    "got_object_commit_alloc_partial");
594 			break;
595 		}
596 
597 		memcpy((*commit)->tree_id->sha1, icommit->tree_id,
598 		    SHA1_DIGEST_LENGTH);
599 		(*commit)->author_time = icommit->author_time;
600 		(*commit)->author_gmtoff = icommit->author_gmtoff;
601 		(*commit)->committer_time = icommit->committer_time;
602 		(*commit)->committer_gmtoff = icommit->committer_gmtoff;
603 
604 		if (icommit->author_len == 0) {
605 			(*commit)->author = strdup("");
606 			if ((*commit)->author == NULL) {
607 				err = got_error_from_errno("strdup");
608 				break;
609 			}
610 		} else {
611 			(*commit)->author = malloc(icommit->author_len + 1);
612 			if ((*commit)->author == NULL) {
613 				err = got_error_from_errno("malloc");
614 				break;
615 			}
616 			memcpy((*commit)->author, imsg.data + len,
617 			    icommit->author_len);
618 			(*commit)->author[icommit->author_len] = '\0';
619 		}
620 		len += icommit->author_len;
621 
622 		if (icommit->committer_len == 0) {
623 			(*commit)->committer = strdup("");
624 			if ((*commit)->committer == NULL) {
625 				err = got_error_from_errno("strdup");
626 				break;
627 			}
628 		} else {
629 			(*commit)->committer =
630 			    malloc(icommit->committer_len + 1);
631 			if ((*commit)->committer == NULL) {
632 				err = got_error_from_errno("malloc");
633 				break;
634 			}
635 			memcpy((*commit)->committer, imsg.data + len,
636 			    icommit->committer_len);
637 			(*commit)->committer[icommit->committer_len] = '\0';
638 		}
639 		len += icommit->committer_len;
640 
641 		if (icommit->logmsg_len == 0) {
642 			(*commit)->logmsg = strdup("");
643 			if ((*commit)->logmsg == NULL) {
644 				err = got_error_from_errno("strdup");
645 				break;
646 			}
647 		} else {
648 			size_t offset = 0, remain = icommit->logmsg_len;
649 
650 			(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
651 			if ((*commit)->logmsg == NULL) {
652 				err = got_error_from_errno("malloc");
653 				break;
654 			}
655 			while (remain > 0) {
656 				struct imsg imsg_log;
657 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
658 				    remain);
659 
660 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
661 				if (err)
662 					return err;
663 
664 				if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG)
665 					return got_error(GOT_ERR_PRIVSEP_MSG);
666 
667 				memcpy((*commit)->logmsg + offset,
668 				    imsg_log.data, n);
669 				imsg_free(&imsg_log);
670 				offset += n;
671 				remain -= n;
672 			}
673 			(*commit)->logmsg[icommit->logmsg_len] = '\0';
674 		}
675 
676 		for (i = 0; i < icommit->nparents; i++) {
677 			struct got_object_qid *qid;
678 
679 			err = got_object_qid_alloc_partial(&qid);
680 			if (err)
681 				break;
682 			memcpy(qid->id, imsg.data + len +
683 			    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
684 			SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
685 			(*commit)->nparents++;
686 		}
687 		break;
688 	default:
689 		err = got_error(GOT_ERR_PRIVSEP_MSG);
690 		break;
691 	}
692 
693 	imsg_free(&imsg);
694 
695 	return err;
696 }
697 
698 const struct got_error *
699 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
700     int nentries)
701 {
702 	const struct got_error *err = NULL;
703 	struct got_imsg_tree_object itree;
704 	struct got_pathlist_entry *pe;
705 	size_t totlen;
706 	int nimsg; /* number of imsg queued in ibuf */
707 
708 	itree.nentries = nentries;
709 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
710 	    == -1)
711 		return got_error_from_errno("imsg_compose TREE");
712 
713 	totlen = sizeof(itree);
714 	nimsg = 1;
715 	TAILQ_FOREACH(pe, entries, entry) {
716 		const char *name = pe->path;
717 		struct got_parsed_tree_entry *pte = pe->data;
718 		struct ibuf *wbuf;
719 		size_t namelen = strlen(name);
720 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
721 
722 		if (len > MAX_IMSGSIZE)
723 			return got_error(GOT_ERR_NO_SPACE);
724 
725 		nimsg++;
726 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
727 			err = flush_imsg(ibuf);
728 			if (err)
729 				return err;
730 			nimsg = 0;
731 		}
732 
733 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
734 		if (wbuf == NULL)
735 			return got_error_from_errno("imsg_create TREE_ENTRY");
736 
737 		/* Keep in sync with struct got_imsg_tree_object definition! */
738 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
739 			err = got_error_from_errno("imsg_add TREE_ENTRY");
740 			ibuf_free(wbuf);
741 			return err;
742 		}
743 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
744 			err = got_error_from_errno("imsg_add TREE_ENTRY");
745 			ibuf_free(wbuf);
746 			return err;
747 		}
748 
749 		if (imsg_add(wbuf, name, namelen) == -1) {
750 			err = got_error_from_errno("imsg_add TREE_ENTRY");
751 			ibuf_free(wbuf);
752 			return err;
753 		}
754 
755 		wbuf->fd = -1;
756 		imsg_close(ibuf, wbuf);
757 
758 		totlen += len;
759 	}
760 
761 	return flush_imsg(ibuf);
762 }
763 
764 const struct got_error *
765 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
766 {
767 	const struct got_error *err = NULL;
768 	const size_t min_datalen =
769 	    MIN(sizeof(struct got_imsg_error),
770 	    sizeof(struct got_imsg_tree_object));
771 	struct got_imsg_tree_object *itree;
772 	int nentries = 0;
773 
774 	*tree = NULL;
775 get_more:
776 	err = read_imsg(ibuf);
777 	if (err)
778 		goto done;
779 
780 	for (;;) {
781 		struct imsg imsg;
782 		size_t n;
783 		size_t datalen;
784 		struct got_imsg_tree_entry *ite;
785 		struct got_tree_entry *te = NULL;
786 
787 		n = imsg_get(ibuf, &imsg);
788 		if (n == 0) {
789 			if (*tree && (*tree)->nentries != nentries)
790 				goto get_more;
791 			break;
792 		}
793 
794 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
795 			return got_error(GOT_ERR_PRIVSEP_LEN);
796 
797 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
798 
799 		switch (imsg.hdr.type) {
800 		case GOT_IMSG_ERROR:
801 			err = recv_imsg_error(&imsg, datalen);
802 			break;
803 		case GOT_IMSG_TREE:
804 			/* This message should only appear once. */
805 			if (*tree != NULL) {
806 				err = got_error(GOT_ERR_PRIVSEP_MSG);
807 				break;
808 			}
809 			if (datalen != sizeof(*itree)) {
810 				err = got_error(GOT_ERR_PRIVSEP_LEN);
811 				break;
812 			}
813 			itree = imsg.data;
814 			*tree = malloc(sizeof(**tree));
815 			if (*tree == NULL) {
816 				err = got_error_from_errno("malloc");
817 				break;
818 			}
819 			(*tree)->entries = calloc(itree->nentries,
820 			    sizeof(struct got_tree_entry));
821 			if ((*tree)->entries == NULL) {
822 				err = got_error_from_errno("malloc");
823 				break;
824 			}
825 			(*tree)->nentries = itree->nentries;
826 			(*tree)->refcnt = 0;
827 			break;
828 		case GOT_IMSG_TREE_ENTRY:
829 			/* This message should be preceeded by GOT_IMSG_TREE. */
830 			if (*tree == NULL) {
831 				err = got_error(GOT_ERR_PRIVSEP_MSG);
832 				break;
833 			}
834 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
835 				err = got_error(GOT_ERR_PRIVSEP_LEN);
836 				break;
837 			}
838 
839 			/* Remaining data contains the entry's name. */
840 			datalen -= sizeof(*ite);
841 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
842 				err = got_error(GOT_ERR_PRIVSEP_LEN);
843 				break;
844 			}
845 			ite = imsg.data;
846 
847 			if (datalen + 1 > sizeof(te->name)) {
848 				err = got_error(GOT_ERR_NO_SPACE);
849 				break;
850 			}
851 			te = &(*tree)->entries[nentries];
852 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
853 			te->name[datalen] = '\0';
854 
855 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
856 			te->mode = ite->mode;
857 			te->idx = nentries;
858 			nentries++;
859 			break;
860 		default:
861 			err = got_error(GOT_ERR_PRIVSEP_MSG);
862 			break;
863 		}
864 
865 		imsg_free(&imsg);
866 	}
867 done:
868 	if (*tree && (*tree)->nentries != nentries) {
869 		if (err == NULL)
870 			err = got_error(GOT_ERR_PRIVSEP_LEN);
871 		got_object_tree_close(*tree);
872 		*tree = NULL;
873 	}
874 
875 	return err;
876 }
877 
878 const struct got_error *
879 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
880     const uint8_t *data)
881 {
882 	struct got_imsg_blob iblob;
883 
884 	iblob.size = size;
885 	iblob.hdrlen = hdrlen;
886 
887 	if (data) {
888 		uint8_t *buf;
889 
890 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
891 			return got_error(GOT_ERR_NO_SPACE);
892 
893 		buf = malloc(sizeof(iblob) + size);
894 		if (buf == NULL)
895 			return got_error_from_errno("malloc");
896 
897 		memcpy(buf, &iblob, sizeof(iblob));
898 		memcpy(buf + sizeof(iblob), data, size);
899 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
900 		   sizeof(iblob) + size) == -1) {
901 			free(buf);
902 			return got_error_from_errno("imsg_compose BLOB");
903 		}
904 		free(buf);
905 	} else {
906 		/* Data has already been written to file descriptor. */
907 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
908 		    sizeof(iblob)) == -1)
909 			return got_error_from_errno("imsg_compose BLOB");
910 	}
911 
912 
913 	return flush_imsg(ibuf);
914 }
915 
916 const struct got_error *
917 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
918     struct imsgbuf *ibuf)
919 {
920 	const struct got_error *err = NULL;
921 	struct imsg imsg;
922 	struct got_imsg_blob *iblob;
923 	size_t datalen;
924 
925 	*outbuf = NULL;
926 
927 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
928 	if (err)
929 		return err;
930 
931 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
932 
933 	switch (imsg.hdr.type) {
934 	case GOT_IMSG_BLOB:
935 		if (datalen < sizeof(*iblob)) {
936 			err = got_error(GOT_ERR_PRIVSEP_LEN);
937 			break;
938 		}
939 		iblob = imsg.data;
940 		*size = iblob->size;
941 		*hdrlen = iblob->hdrlen;
942 
943 		if (datalen == sizeof(*iblob)) {
944 			/* Data has been written to file descriptor. */
945 			break;
946 		}
947 
948 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
949 			err = got_error(GOT_ERR_PRIVSEP_LEN);
950 			break;
951 		}
952 
953 		*outbuf = malloc(*size);
954 		if (*outbuf == NULL) {
955 			err = got_error_from_errno("malloc");
956 			break;
957 		}
958 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
959 		break;
960 	default:
961 		err = got_error(GOT_ERR_PRIVSEP_MSG);
962 		break;
963 	}
964 
965 	imsg_free(&imsg);
966 
967 	return err;
968 }
969 
970 static const struct got_error *
971 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
972 {
973 	const struct got_error *err = NULL;
974 	size_t offset, remain;
975 
976 	offset = 0;
977 	remain = tagmsg_len;
978 	while (remain > 0) {
979 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
980 
981 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
982 		    tag->tagmsg + offset, n) == -1) {
983 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
984 			break;
985 		}
986 
987 		err = flush_imsg(ibuf);
988 		if (err)
989 			break;
990 
991 		offset += n;
992 		remain -= n;
993 	}
994 
995 	return err;
996 }
997 
998 const struct got_error *
999 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1000 {
1001 	const struct got_error *err = NULL;
1002 	struct got_imsg_tag_object *itag;
1003 	uint8_t *buf;
1004 	size_t len, total;
1005 	size_t tag_len = strlen(tag->tag);
1006 	size_t tagger_len = strlen(tag->tagger);
1007 	size_t tagmsg_len = strlen(tag->tagmsg);
1008 
1009 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1010 
1011 	buf = malloc(total);
1012 	if (buf == NULL)
1013 		return got_error_from_errno("malloc");
1014 
1015 	itag = (struct got_imsg_tag_object *)buf;
1016 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1017 	itag->obj_type = tag->obj_type;
1018 	itag->tag_len = tag_len;
1019 	itag->tagger_len = tagger_len;
1020 	itag->tagger_time = tag->tagger_time;
1021 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1022 	itag->tagmsg_len = tagmsg_len;
1023 
1024 	len = sizeof(*itag);
1025 	memcpy(buf + len, tag->tag, tag_len);
1026 	len += tag_len;
1027 	memcpy(buf + len, tag->tagger, tagger_len);
1028 	len += tagger_len;
1029 
1030 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1031 		err = got_error_from_errno("imsg_compose TAG");
1032 		goto done;
1033 	}
1034 
1035 	if (tagmsg_len == 0 ||
1036 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1037 		err = flush_imsg(ibuf);
1038 		if (err)
1039 			goto done;
1040 	}
1041 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1042 done:
1043 	free(buf);
1044 	return err;
1045 }
1046 
1047 const struct got_error *
1048 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1049 {
1050 	const struct got_error *err = NULL;
1051 	struct imsg imsg;
1052 	struct got_imsg_tag_object *itag;
1053 	size_t len, datalen;
1054 	const size_t min_datalen =
1055 	    MIN(sizeof(struct got_imsg_error),
1056 	    sizeof(struct got_imsg_tag_object));
1057 
1058 	*tag = NULL;
1059 
1060 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1061 	if (err)
1062 		return err;
1063 
1064 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1065 	len = 0;
1066 
1067 	switch (imsg.hdr.type) {
1068 	case GOT_IMSG_TAG:
1069 		if (datalen < sizeof(*itag)) {
1070 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1071 			break;
1072 		}
1073 		itag = imsg.data;
1074 		if (datalen != sizeof(*itag) + itag->tag_len +
1075 		    itag->tagger_len) {
1076 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1077 			break;
1078 		}
1079 		len += sizeof(*itag);
1080 
1081 		*tag = calloc(1, sizeof(**tag));
1082 		if (*tag == NULL) {
1083 			err = got_error_from_errno("calloc");
1084 			break;
1085 		}
1086 
1087 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1088 
1089 		if (itag->tag_len == 0) {
1090 			(*tag)->tag = strdup("");
1091 			if ((*tag)->tag == NULL) {
1092 				err = got_error_from_errno("strdup");
1093 				break;
1094 			}
1095 		} else {
1096 			(*tag)->tag = malloc(itag->tag_len + 1);
1097 			if ((*tag)->tag == NULL) {
1098 				err = got_error_from_errno("malloc");
1099 				break;
1100 			}
1101 			memcpy((*tag)->tag, imsg.data + len,
1102 			    itag->tag_len);
1103 			(*tag)->tag[itag->tag_len] = '\0';
1104 		}
1105 		len += itag->tag_len;
1106 
1107 		(*tag)->obj_type = itag->obj_type;
1108 		(*tag)->tagger_time = itag->tagger_time;
1109 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1110 
1111 		if (itag->tagger_len == 0) {
1112 			(*tag)->tagger = strdup("");
1113 			if ((*tag)->tagger == NULL) {
1114 				err = got_error_from_errno("strdup");
1115 				break;
1116 			}
1117 		} else {
1118 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1119 			if ((*tag)->tagger == NULL) {
1120 				err = got_error_from_errno("malloc");
1121 				break;
1122 			}
1123 			memcpy((*tag)->tagger, imsg.data + len,
1124 			    itag->tagger_len);
1125 			(*tag)->tagger[itag->tagger_len] = '\0';
1126 		}
1127 		len += itag->tagger_len;
1128 
1129 		if (itag->tagmsg_len == 0) {
1130 			(*tag)->tagmsg = strdup("");
1131 			if ((*tag)->tagmsg == NULL) {
1132 				err = got_error_from_errno("strdup");
1133 				break;
1134 			}
1135 		} else {
1136 			size_t offset = 0, remain = itag->tagmsg_len;
1137 
1138 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1139 			if ((*tag)->tagmsg == NULL) {
1140 				err = got_error_from_errno("malloc");
1141 				break;
1142 			}
1143 			while (remain > 0) {
1144 				struct imsg imsg_log;
1145 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1146 				    remain);
1147 
1148 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1149 				if (err)
1150 					return err;
1151 
1152 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1153 					return got_error(GOT_ERR_PRIVSEP_MSG);
1154 
1155 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1156 				    n);
1157 				imsg_free(&imsg_log);
1158 				offset += n;
1159 				remain -= n;
1160 			}
1161 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1162 		}
1163 
1164 		break;
1165 	default:
1166 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1167 		break;
1168 	}
1169 
1170 	imsg_free(&imsg);
1171 
1172 	return err;
1173 }
1174 
1175 const struct got_error *
1176 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1177     struct got_packidx *packidx)
1178 {
1179 	const struct got_error *err = NULL;
1180 	struct got_imsg_packidx ipackidx;
1181 	struct got_imsg_pack ipack;
1182 	int fd;
1183 
1184 	ipackidx.len = packidx->len;
1185 	fd = dup(packidx->fd);
1186 	if (fd == -1)
1187 		return got_error_from_errno("dup");
1188 
1189 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1190 	    sizeof(ipackidx)) == -1) {
1191 		err = got_error_from_errno("imsg_compose PACKIDX");
1192 		close(fd);
1193 		return err;
1194 	}
1195 
1196 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1197 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1198 		return got_error(GOT_ERR_NO_SPACE);
1199 	ipack.filesize = pack->filesize;
1200 
1201 	fd = dup(pack->fd);
1202 	if (fd == -1)
1203 		return got_error_from_errno("dup");
1204 
1205 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1206 	    == -1) {
1207 		err = got_error_from_errno("imsg_compose PACK");
1208 		close(fd);
1209 		return err;
1210 	}
1211 
1212 	return flush_imsg(ibuf);
1213 }
1214 
1215 const struct got_error *
1216 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1217     struct got_object_id *id)
1218 {
1219 	struct got_imsg_packed_object iobj;
1220 
1221 	iobj.idx = idx;
1222 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1223 
1224 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1225 	    &iobj, sizeof(iobj)) == -1)
1226 		return got_error_from_errno("imsg_compose "
1227 		    "PACKED_OBJECT_REQUEST");
1228 
1229 	return flush_imsg(ibuf);
1230 }
1231 
1232 const struct got_error *
1233 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1234 {
1235 	const struct got_error *err = NULL;
1236 
1237 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1238 	    NULL, 0) == -1) {
1239 		err = got_error_from_errno("imsg_compose "
1240 		    "GITCONFIG_PARSE_REQUEST");
1241 		close(fd);
1242 		return err;
1243 	}
1244 
1245 	return flush_imsg(ibuf);
1246 }
1247 
1248 const struct got_error *
1249 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1250 {
1251 	if (imsg_compose(ibuf,
1252 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1253 	    NULL, 0) == -1)
1254 		return got_error_from_errno("imsg_compose "
1255 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1256 
1257 	return flush_imsg(ibuf);
1258 }
1259 
1260 const struct got_error *
1261 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1262 {
1263 	if (imsg_compose(ibuf,
1264 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1265 		return got_error_from_errno("imsg_compose "
1266 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1267 
1268 	return flush_imsg(ibuf);
1269 }
1270 
1271 const struct got_error *
1272 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1273 {
1274 	if (imsg_compose(ibuf,
1275 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1276 		return got_error_from_errno("imsg_compose "
1277 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1278 
1279 	return flush_imsg(ibuf);
1280 }
1281 
1282 const struct got_error *
1283 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1284 {
1285 	if (imsg_compose(ibuf,
1286 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1287 		return got_error_from_errno("imsg_compose "
1288 		    "GITCONFIG_REMOTE_REQUEST");
1289 
1290 	return flush_imsg(ibuf);
1291 }
1292 
1293 const struct got_error *
1294 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1295 {
1296 	size_t len = value ? strlen(value) + 1 : 0;
1297 
1298 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1299 	    value, len) == -1)
1300 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1301 
1302 	return flush_imsg(ibuf);
1303 }
1304 
1305 const struct got_error *
1306 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1307 {
1308 	const struct got_error *err = NULL;
1309 	struct imsg imsg;
1310 	size_t datalen;
1311 	const size_t min_datalen = 0;
1312 
1313 	*str = NULL;
1314 
1315 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1316 	if (err)
1317 		return err;
1318 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1319 
1320 	switch (imsg.hdr.type) {
1321 	case GOT_IMSG_GITCONFIG_STR_VAL:
1322 		if (datalen == 0)
1323 			break;
1324 		*str = malloc(datalen);
1325 		if (*str == NULL) {
1326 			err = got_error_from_errno("malloc");
1327 			break;
1328 		}
1329 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1330 			err = got_error(GOT_ERR_NO_SPACE);
1331 		break;
1332 	default:
1333 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1334 		break;
1335 	}
1336 
1337 	imsg_free(&imsg);
1338 	return err;
1339 }
1340 
1341 const struct got_error *
1342 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1343 {
1344 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1345 	    &value, sizeof(value)) == -1)
1346 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1347 
1348 	return flush_imsg(ibuf);
1349 }
1350 
1351 const struct got_error *
1352 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1353 {
1354 	const struct got_error *err = NULL;
1355 	struct imsg imsg;
1356 	size_t datalen;
1357 	const size_t min_datalen =
1358 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1359 
1360 	*val = 0;
1361 
1362 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1363 	if (err)
1364 		return err;
1365 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1366 
1367 	switch (imsg.hdr.type) {
1368 	case GOT_IMSG_GITCONFIG_INT_VAL:
1369 		if (datalen != sizeof(*val)) {
1370 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1371 			break;
1372 		}
1373 		memcpy(val, imsg.data, sizeof(*val));
1374 		break;
1375 	default:
1376 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1377 		break;
1378 	}
1379 
1380 	imsg_free(&imsg);
1381 	return err;
1382 }
1383 
1384 const struct got_error *
1385 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1386     struct got_remote_repo *remotes, int nremotes)
1387 {
1388 	const struct got_error *err = NULL;
1389 	struct got_imsg_remotes iremotes;
1390 	int i;
1391 
1392 	iremotes.nremotes = nremotes;
1393 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1394 	    &iremotes, sizeof(iremotes)) == -1)
1395 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1396 
1397 	err = flush_imsg(ibuf);
1398 	imsg_clear(ibuf);
1399 	if (err)
1400 		return err;
1401 
1402 	for (i = 0; i < nremotes; i++) {
1403 		struct got_imsg_remote iremote;
1404 		size_t len = sizeof(iremote);
1405 		struct ibuf *wbuf;
1406 
1407 		iremote.name_len = strlen(remotes[i].name);
1408 		len += iremote.name_len;
1409 		iremote.url_len = strlen(remotes[i].url);
1410 		len += iremote.url_len;
1411 
1412 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1413 		if (wbuf == NULL)
1414 			return got_error_from_errno(
1415 			    "imsg_create GITCONFIG_REMOTE");
1416 
1417 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1418 			err = got_error_from_errno(
1419 			    "imsg_add GIITCONFIG_REMOTE");
1420 			ibuf_free(wbuf);
1421 			return err;
1422 		}
1423 
1424 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1425 			err = got_error_from_errno(
1426 			    "imsg_add GIITCONFIG_REMOTE");
1427 			ibuf_free(wbuf);
1428 			return err;
1429 		}
1430 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1431 			err = got_error_from_errno(
1432 			    "imsg_add GIITCONFIG_REMOTE");
1433 			ibuf_free(wbuf);
1434 			return err;
1435 		}
1436 
1437 		wbuf->fd = -1;
1438 		imsg_close(ibuf, wbuf);
1439 		err = flush_imsg(ibuf);
1440 		if (err)
1441 			return err;
1442 	}
1443 
1444 	return NULL;
1445 }
1446 
1447 const struct got_error *
1448 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1449     int *nremotes, struct imsgbuf *ibuf)
1450 {
1451 	const struct got_error *err = NULL;
1452 	struct imsg imsg;
1453 	size_t datalen;
1454 	struct got_imsg_remotes iremotes;
1455 	struct got_imsg_remote iremote;
1456 
1457 	*remotes = NULL;
1458 	*nremotes = 0;
1459 
1460 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
1461 	if (err)
1462 		return err;
1463 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1464 
1465 	switch (imsg.hdr.type) {
1466 	case GOT_IMSG_GITCONFIG_REMOTES:
1467 		if (datalen != sizeof(iremotes)) {
1468 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1469 			break;
1470 		}
1471 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
1472 		if (iremotes.nremotes == 0) {
1473 			imsg_free(&imsg);
1474 			return NULL;
1475 		}
1476 		break;
1477 	default:
1478 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1479 		break;
1480 	}
1481 
1482 	imsg_free(&imsg);
1483 
1484 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(iremote));
1485 	if (*remotes == NULL)
1486 		return got_error_from_errno("recallocarray");
1487 
1488 	while (*nremotes < iremotes.nremotes) {
1489 		struct got_remote_repo *remote;
1490 	
1491 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
1492 		if (err)
1493 			break;
1494 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1495 
1496 		switch (imsg.hdr.type) {
1497 		case GOT_IMSG_GITCONFIG_REMOTE:
1498 			remote = &(*remotes)[*nremotes];
1499 			if (datalen < sizeof(iremote)) {
1500 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1501 				break;
1502 			}
1503 			memcpy(&iremote, imsg.data, sizeof(iremote));
1504 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
1505 			    (sizeof(iremote) + iremote.name_len +
1506 			    iremote.url_len) > datalen) {
1507 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1508 				break;
1509 			}
1510 			remote->name = strndup(imsg.data + sizeof(iremote),
1511 			    iremote.name_len);
1512 			if (remote->name == NULL) {
1513 				err = got_error_from_errno("strndup");
1514 				break;
1515 			}
1516 			remote->url = strndup(imsg.data + sizeof(iremote) +
1517 			    iremote.name_len, iremote.url_len);
1518 			if (remote->url == NULL) {
1519 				err = got_error_from_errno("strndup");
1520 				free(remote->name);
1521 				break;
1522 			}
1523 			(*nremotes)++;
1524 			break;
1525 		default:
1526 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1527 			break;
1528 		}
1529 
1530 		imsg_free(&imsg);
1531 		if (err)
1532 			break;
1533 	}
1534 
1535 	if (err) {
1536 		int i;
1537 		for (i = 0; i < *nremotes; i++) {
1538 			free((*remotes)[i].name);
1539 			free((*remotes)[i].url);
1540 		}
1541 		free(*remotes);
1542 		*remotes = NULL;
1543 		*nremotes = 0;
1544 	}
1545 	return err;
1546 }
1547 
1548 const struct got_error *
1549 got_privsep_unveil_exec_helpers(void)
1550 {
1551 	const char *helpers[] = {
1552 	    GOT_PATH_PROG_READ_PACK,
1553 	    GOT_PATH_PROG_READ_OBJECT,
1554 	    GOT_PATH_PROG_READ_COMMIT,
1555 	    GOT_PATH_PROG_READ_TREE,
1556 	    GOT_PATH_PROG_READ_BLOB,
1557 	    GOT_PATH_PROG_READ_TAG,
1558 	    GOT_PATH_PROG_READ_GITCONFIG,
1559 	};
1560 	int i;
1561 
1562 	for (i = 0; i < nitems(helpers); i++) {
1563 		if (unveil(helpers[i], "x") == 0)
1564 			continue;
1565 		return got_error_from_errno2("unveil", helpers[i]);
1566 	}
1567 
1568 	return NULL;
1569 }
1570 
1571 void
1572 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
1573 {
1574 	if (close(imsg_fds[0]) != 0) {
1575 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1576 		_exit(1);
1577 	}
1578 
1579 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
1580 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1581 		_exit(1);
1582 	}
1583 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
1584 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
1585 		_exit(1);
1586 	}
1587 
1588 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
1589 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
1590 		    strerror(errno));
1591 		_exit(1);
1592 	}
1593 }