Got Mirror

Blob

Date:: Fri Mar 20 11:44:14 2020 UTC
Message:: add support for repository mirrors to 'got clone' and 'got fetch'
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/syslimits.h>
22 #include <sys/wait.h>
23 
24 #include <ctype.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <stdint.h>
30 #include <poll.h>
31 #include <imsg.h>
32 #include <sha1.h>
33 #include <zlib.h>
34 #include <time.h>
35 
36 #include "got_object.h"
37 #include "got_error.h"
38 #include "got_path.h"
39 #include "got_repository.h"
40 
41 #include "got_lib_sha1.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_object_parse.h"
46 #include "got_lib_privsep.h"
47 #include "got_lib_pack.h"
48 
49 #ifndef MIN
50 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
51 #endif
52 
53 #ifndef nitems
54 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
55 #endif
56 
57 static const struct got_error *
58 poll_fd(int fd, int events, int timeout)
59 {
60 	struct pollfd pfd[1];
61 	int n;
62 
63 	pfd[0].fd = fd;
64 	pfd[0].events = events;
65 
66 	n = poll(pfd, 1, timeout);
67 	if (n == -1)
68 		return got_error_from_errno("poll");
69 	if (n == 0)
70 		return got_error(GOT_ERR_TIMEOUT);
71 	if (pfd[0].revents & (POLLERR | POLLNVAL))
72 		return got_error_from_errno("poll error");
73 	if (pfd[0].revents & (events | POLLHUP))
74 		return NULL;
75 
76 	return got_error(GOT_ERR_INTERRUPT);
77 }
78 
79 static const struct got_error *
80 read_imsg(struct imsgbuf *ibuf)
81 {
82 	const struct got_error *err;
83 	size_t n;
84 
85 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
86 	if (err)
87 		return err;
88 
89 	n = imsg_read(ibuf);
90 	if (n == -1) {
91 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
92 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
93 		return got_error(GOT_ERR_PRIVSEP_READ);
94 	}
95 	if (n == 0)
96 		return got_error(GOT_ERR_PRIVSEP_PIPE);
97 
98 	return NULL;
99 }
100 
101 const struct got_error *
102 got_privsep_wait_for_child(pid_t pid)
103 {
104 	int child_status;
105 
106 	if (waitpid(pid, &child_status, 0) == -1)
107 		return got_error_from_errno("waitpid");
108 
109 	if (!WIFEXITED(child_status))
110 		return got_error(GOT_ERR_PRIVSEP_DIED);
111 
112 	if (WEXITSTATUS(child_status) != 0)
113 		return got_error(GOT_ERR_PRIVSEP_EXIT);
114 
115 	return NULL;
116 }
117 
118 static const struct got_error *
119 recv_imsg_error(struct imsg *imsg, size_t datalen)
120 {
121 	struct got_imsg_error *ierr;
122 
123 	if (datalen != sizeof(*ierr))
124 		return got_error(GOT_ERR_PRIVSEP_LEN);
125 
126 	ierr = imsg->data;
127 	if (ierr->code == GOT_ERR_ERRNO) {
128 		static struct got_error serr;
129 		serr.code = GOT_ERR_ERRNO;
130 		serr.msg = strerror(ierr->errno_code);
131 		return &serr;
132 	}
133 
134 	return got_error(ierr->code);
135 }
136 
137 const struct got_error *
138 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
139     size_t min_datalen)
140 {
141 	const struct got_error *err;
142 	ssize_t n;
143 
144 	n = imsg_get(ibuf, imsg);
145 	if (n == -1)
146 		return got_error_from_errno("imsg_get");
147 
148 	while (n == 0) {
149 		err = read_imsg(ibuf);
150 		if (err)
151 			return err;
152 		n = imsg_get(ibuf, imsg);
153 		if (n == -1)
154 			return got_error_from_errno("imsg_get");
155 	}
156 
157 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
158 		return got_error(GOT_ERR_PRIVSEP_LEN);
159 
160 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
161 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
162 		return recv_imsg_error(imsg, datalen);
163 	}
164 
165 	return NULL;
166 }
167 
168 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
169 void
170 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
171 {
172 	const struct got_error *poll_err;
173 	struct got_imsg_error ierr;
174 	int ret;
175 
176 	ierr.code = err->code;
177 	if (err->code == GOT_ERR_ERRNO)
178 		ierr.errno_code = errno;
179 	else
180 		ierr.errno_code = 0;
181 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
182 	if (ret == -1) {
183 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
184 		    getprogname(), err->code, err->msg, strerror(errno));
185 		return;
186 	}
187 
188 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
189 	if (poll_err) {
190 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
191 		    getprogname(), err->code, err->msg, poll_err->msg);
192 		return;
193 	}
194 
195 	ret = imsg_flush(ibuf);
196 	if (ret == -1) {
197 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
198 		    getprogname(), err->code, err->msg, strerror(errno));
199 		return;
200 	}
201 }
202 
203 static const struct got_error *
204 flush_imsg(struct imsgbuf *ibuf)
205 {
206 	const struct got_error *err;
207 
208 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
209 	if (err)
210 		return err;
211 
212 	if (imsg_flush(ibuf) == -1)
213 		return got_error_from_errno("imsg_flush");
214 
215 	return NULL;
216 }
217 
218 const struct got_error *
219 got_privsep_send_stop(int fd)
220 {
221 	const struct got_error *err = NULL;
222 	struct imsgbuf ibuf;
223 
224 	imsg_init(&ibuf, fd);
225 
226 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
227 		return got_error_from_errno("imsg_compose STOP");
228 
229 	err = flush_imsg(&ibuf);
230 	imsg_clear(&ibuf);
231 	return err;
232 }
233 
234 const struct got_error *
235 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd)
236 {
237 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd, NULL, 0)
238 	    == -1)
239 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
240 
241 	return flush_imsg(ibuf);
242 }
243 
244 const struct got_error *
245 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
246     struct got_object_id *id, int pack_idx)
247 {
248 	const struct got_error *err = NULL;
249 	struct got_imsg_packed_object iobj, *iobjp;
250 	size_t len;
251 
252 	if (id) { /* commit is packed */
253 		iobj.idx = pack_idx;
254 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
255 		iobjp = &iobj;
256 		len = sizeof(iobj);
257 	} else {
258 		iobjp = NULL;
259 		len = 0;
260 	}
261 
262 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, iobjp, len)
263 	    == -1) {
264 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
265 		close(fd);
266 		return err;
267 	}
268 
269 	return flush_imsg(ibuf);
270 }
271 
272 const struct got_error *
273 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
274     struct got_object_id *id, int pack_idx)
275 {
276 	const struct got_error *err = NULL;
277 	struct ibuf *wbuf;
278 	size_t len = id ? sizeof(struct got_imsg_packed_object) : 0;
279 
280 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
281 	if (wbuf == NULL)
282 		return got_error_from_errno("imsg_create TREE_REQUEST");
283 
284 	if (id) { /* tree is packed */
285 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
286 			err = got_error_from_errno("imsg_add TREE_ENTRY");
287 			ibuf_free(wbuf);
288 			return err;
289 		}
290 
291 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1) {
292 			err = got_error_from_errno("imsg_add TREE_ENTRY");
293 			ibuf_free(wbuf);
294 			return err;
295 		}
296 	}
297 
298 	wbuf->fd = fd;
299 	imsg_close(ibuf, wbuf);
300 
301 	return flush_imsg(ibuf);
302 }
303 
304 const struct got_error *
305 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
306     struct got_object_id *id, int pack_idx)
307 {
308 	struct got_imsg_packed_object iobj, *iobjp;
309 	size_t len;
310 
311 	if (id) { /* tag is packed */
312 		iobj.idx = pack_idx;
313 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
314 		iobjp = &iobj;
315 		len = sizeof(iobj);
316 	} else {
317 		iobjp = NULL;
318 		len = 0;
319 	}
320 
321 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, iobjp, len)
322 	    == -1)
323 		return got_error_from_errno("imsg_compose TAG_REQUEST");
324 
325 	return flush_imsg(ibuf);
326 }
327 
328 const struct got_error *
329 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
330     struct got_object_id *id, int pack_idx)
331 {
332 	const struct got_error *err = NULL;
333 	struct got_imsg_packed_object iobj, *iobjp;
334 	size_t len;
335 
336 	if (id) { /* blob is packed */
337 		iobj.idx = pack_idx;
338 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
339 		iobjp = &iobj;
340 		len = sizeof(iobj);
341 	} else {
342 		iobjp = NULL;
343 		len = 0;
344 	}
345 
346 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, iobjp, len)
347 	    == -1) {
348 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
349 		close(infd);
350 		return err;
351 	}
352 
353 	return flush_imsg(ibuf);
354 }
355 
356 const struct got_error *
357 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
358 {
359 	const struct got_error *err = NULL;
360 
361 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
362 	    == -1) {
363 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
364 		close(outfd);
365 		return err;
366 	}
367 
368 	return flush_imsg(ibuf);
369 }
370 
371 static const struct got_error *
372 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
373 {
374 	const struct got_error *err = NULL;
375 
376 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -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_tmpfd(struct imsgbuf *ibuf, int fd)
387 {
388 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
389 }
390 
391 const struct got_error *
392 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
393 {
394 	struct got_imsg_object iobj;
395 
396 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
397 	iobj.type = obj->type;
398 	iobj.flags = obj->flags;
399 	iobj.hdrlen = obj->hdrlen;
400 	iobj.size = obj->size;
401 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
402 		iobj.pack_offset = obj->pack_offset;
403 		iobj.pack_idx = obj->pack_idx;
404 	}
405 
406 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
407 	    == -1)
408 		return got_error_from_errno("imsg_compose OBJECT");
409 
410 	return flush_imsg(ibuf);
411 }
412 
413 const struct got_error *
414 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
415    struct got_pathlist_head *have_refs)
416 {
417 	const struct got_error *err = NULL;
418 	struct ibuf *wbuf;
419 	size_t len, n_have_refs = 0;
420 	struct got_pathlist_entry *pe;
421 
422 	len = sizeof(struct got_imsg_fetch_symrefs);
423 	TAILQ_FOREACH(pe, have_refs, entry) {
424 		len += sizeof(struct got_imsg_fetch_have_ref) + pe->path_len;
425 		n_have_refs++;
426 	}
427 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
428 		close(fd);
429 		return got_error(GOT_ERR_NO_SPACE);
430 	}
431 
432 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
433 	if (wbuf == NULL) {
434 		close(fd);
435 		return got_error_from_errno("imsg_create FETCH_REQUEST");
436 	}
437 
438 	/* Keep in sync with struct got_imsg_fetch_have_refs definition! */
439 	if (imsg_add(wbuf, &n_have_refs, sizeof(n_have_refs)) == -1) {
440 		err = got_error_from_errno("imsg_add FETCH_REQUEST");
441 		ibuf_free(wbuf);
442 		close(fd);
443 		return err;
444 	}
445 
446 	TAILQ_FOREACH(pe, have_refs, entry) {
447 		const char *name = pe->path;
448 		size_t name_len = pe->path_len;
449 		struct got_object_id *id = pe->data;
450 
451 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
452 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1) {
453 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
454 			ibuf_free(wbuf);
455 			close(fd);
456 			return err;
457 		}
458 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
459 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
460 			ibuf_free(wbuf);
461 			close(fd);
462 			return err;
463 		}
464 		if (imsg_add(wbuf, name, name_len) == -1) {
465 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
466 			ibuf_free(wbuf);
467 			close(fd);
468 			return err;
469 		}
470 	}
471 
472 	wbuf->fd = fd;
473 	imsg_close(ibuf, wbuf);
474 	return flush_imsg(ibuf);
475 }
476 
477 const struct got_error *
478 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
479 {
480 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
481 }
482 
483 
484 const struct got_error *
485 got_privsep_send_fetch_symrefs(struct imsgbuf *ibuf,
486     struct got_pathlist_head *symrefs)
487 {
488 	const struct got_error *err = NULL;
489 	struct ibuf *wbuf;
490 	size_t len, nsymrefs = 0;
491 	struct got_pathlist_entry *pe;
492 
493 	len = sizeof(struct got_imsg_fetch_symrefs);
494 	TAILQ_FOREACH(pe, symrefs, entry) {
495 		const char *target = pe->data;
496 		len += sizeof(struct got_imsg_fetch_symref) +
497 		    pe->path_len + strlen(target);
498 		nsymrefs++;
499 	}
500 
501 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
502 		return got_error(GOT_ERR_NO_SPACE);
503 
504 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_SYMREFS, 0, 0, len);
505 	if (wbuf == NULL)
506 		return got_error_from_errno("imsg_create FETCH_SYMREFS");
507 
508 	/* Keep in sync with struct got_imsg_fetch_symrefs definition! */
509 	if (imsg_add(wbuf, &nsymrefs, sizeof(nsymrefs)) == -1) {
510 		err = got_error_from_errno("imsg_add FETCH_SYMREFS");
511 		ibuf_free(wbuf);
512 		return err;
513 	}
514 
515 	TAILQ_FOREACH(pe, symrefs, entry) {
516 		const char *name = pe->path;
517 		size_t name_len = pe->path_len;
518 		const char *target = pe->data;
519 		size_t target_len = strlen(target);
520 
521 		/* Keep in sync with struct got_imsg_fetch_symref definition! */
522 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
523 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
524 			ibuf_free(wbuf);
525 			return err;
526 		}
527 		if (imsg_add(wbuf, &target_len, sizeof(target_len)) == -1) {
528 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
529 			ibuf_free(wbuf);
530 			return err;
531 		}
532 		if (imsg_add(wbuf, name, name_len) == -1) {
533 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
534 			ibuf_free(wbuf);
535 			return err;
536 		}
537 		if (imsg_add(wbuf, target, target_len) == -1) {
538 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
539 			ibuf_free(wbuf);
540 			return err;
541 		}
542 	}
543 
544 	wbuf->fd = -1;
545 	imsg_close(ibuf, wbuf);
546 	return flush_imsg(ibuf);
547 }
548 
549 const struct got_error *
550 got_privsep_send_fetch_ref(struct imsgbuf *ibuf,
551     struct got_object_id *refid, const char *refname)
552 {
553 	const struct got_error *err = NULL;
554 	struct ibuf *wbuf;
555 	size_t len, reflen = strlen(refname);
556 
557 	len = sizeof(struct got_imsg_fetch_ref) + reflen;
558 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
559 		return got_error(GOT_ERR_NO_SPACE);
560 
561 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REF, 0, 0, len);
562 	if (wbuf == NULL)
563 		return got_error_from_errno("imsg_create FETCH_REF");
564 
565 	/* Keep in sync with struct got_imsg_fetch_ref definition! */
566 	if (imsg_add(wbuf, refid->sha1, SHA1_DIGEST_LENGTH) == -1) {
567 		err = got_error_from_errno("imsg_add FETCH_REF");
568 		ibuf_free(wbuf);
569 		return err;
570 	}
571 	if (imsg_add(wbuf, refname, reflen) == -1) {
572 		err = got_error_from_errno("imsg_add FETCH_REF");
573 		ibuf_free(wbuf);
574 		return err;
575 	}
576 
577 	wbuf->fd = -1;
578 	imsg_close(ibuf, wbuf);
579 	return flush_imsg(ibuf);
580 }
581 
582 const struct got_error *
583 got_privsep_send_fetch_server_progress(struct imsgbuf *ibuf, const char *msg,
584     size_t msglen)
585 {
586 	if (msglen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
587 		return got_error(GOT_ERR_NO_SPACE);
588 
589 	if (msglen == 0)
590 		return NULL;
591 
592 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_SERVER_PROGRESS, 0, 0, -1,
593 	    msg, msglen) == -1)
594 		return got_error_from_errno(
595 		    "imsg_compose FETCH_SERVER_PROGRESS");
596 
597 	return flush_imsg(ibuf);
598 }
599 
600 const struct got_error *
601 got_privsep_send_fetch_download_progress(struct imsgbuf *ibuf, off_t bytes)
602 {
603 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DOWNLOAD_PROGRESS, 0, 0, -1,
604 	    &bytes, sizeof(bytes)) == -1)
605 		return got_error_from_errno(
606 		    "imsg_compose FETCH_DOWNLOAD_PROGRESS");
607 
608 	return flush_imsg(ibuf);
609 }
610 
611 const struct got_error *
612 got_privsep_send_fetch_done(struct imsgbuf *ibuf, struct got_object_id hash)
613 {
614 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DONE, 0, 0, -1,
615 	    hash.sha1, SHA1_DIGEST_LENGTH) == -1)
616 		return got_error_from_errno("imsg_compose FETCH");
617 	return flush_imsg(ibuf);
618 }
619 
620 
621 const struct got_error *
622 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
623     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
624     off_t *packfile_size, struct imsgbuf *ibuf)
625 {
626 	const struct got_error *err = NULL;
627 	struct imsg imsg;
628 	size_t datalen;
629 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
630 	size_t n, remain;
631 	off_t off;
632 	int i;
633 
634 	*done = 0;
635 	*id = NULL;
636 	*refname = NULL;
637 	*server_progress = NULL;
638 	*packfile_size = 0;
639 
640 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
641 	if (err)
642 		return err;
643 
644 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
645 	switch (imsg.hdr.type) {
646 	case GOT_IMSG_ERROR:
647 		if (datalen < sizeof(struct got_imsg_error)) {
648 			err = got_error(GOT_ERR_PRIVSEP_LEN);
649 			break;
650 		}
651 		err = recv_imsg_error(&imsg, datalen);
652 		break;
653 	case GOT_IMSG_FETCH_SYMREFS:
654 		if (datalen < sizeof(*isymrefs)) {
655 			err = got_error(GOT_ERR_PRIVSEP_LEN);
656 			break;
657 		}
658 		if (isymrefs != NULL) {
659 			err = got_error(GOT_ERR_PRIVSEP_MSG);
660 			break;
661 		}
662 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
663 		off = sizeof(*isymrefs);
664 		remain = datalen - off;
665 		for (n = 0; n < isymrefs->nsymrefs; n++) {
666 			struct got_imsg_fetch_symref *s;
667 			char *name, *target;
668 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
669 				err = got_error(GOT_ERR_PRIVSEP_LEN);
670 				goto done;
671 			}
672 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
673 			off += sizeof(*s);
674 			remain -= sizeof(*s);
675 			if (remain < s->name_len) {
676 				err = got_error(GOT_ERR_PRIVSEP_LEN);
677 				goto done;
678 			}
679 			name = strndup(imsg.data + off, s->name_len);
680 			if (name == NULL) {
681 				err = got_error_from_errno("strndup");
682 				goto done;
683 			}
684 			off += s->name_len;
685 			remain -= s->name_len;
686 			if (remain < s->target_len) {
687 				err = got_error(GOT_ERR_PRIVSEP_LEN);
688 				free(name);
689 				goto done;
690 			}
691 			target = strndup(imsg.data + off, s->target_len);
692 			if (target == NULL) {
693 				err = got_error_from_errno("strndup");
694 				free(name);
695 				goto done;
696 			}
697 			off += s->target_len;
698 			remain -= s->target_len;
699 			err = got_pathlist_append(symrefs, name, target);
700 			if (err) {
701 				free(name);
702 				free(target);
703 				goto done;
704 			}
705 		}
706 		break;
707 	case GOT_IMSG_FETCH_REF:
708 		if (datalen <= SHA1_DIGEST_LENGTH) {
709 			err = got_error(GOT_ERR_PRIVSEP_MSG);
710 			break;
711 		}
712 		*id = malloc(sizeof(**id));
713 		if (*id == NULL) {
714 			err = got_error_from_errno("malloc");
715 			break;
716 		}
717 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
718 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
719 		    datalen - SHA1_DIGEST_LENGTH);
720 		if (*refname == NULL) {
721 			err = got_error_from_errno("strndup");
722 			break;
723 		}
724 		break;
725 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
726 		if (datalen == 0) {
727 			err = got_error(GOT_ERR_PRIVSEP_LEN);
728 			break;
729 		}
730 		*server_progress = strndup(imsg.data, datalen);
731 		if (*server_progress == NULL) {
732 			err = got_error_from_errno("strndup");
733 			break;
734 		}
735 		for (i = 0; i < datalen; i++) {
736 			if (!isprint((unsigned char)(*server_progress)[i]) &&
737 			    !isspace((unsigned char)(*server_progress)[i])) {
738 				err = got_error(GOT_ERR_PRIVSEP_MSG);
739 				free(*server_progress);
740 				*server_progress = NULL;
741 				goto done;
742 			}
743 		}
744 		break;
745 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
746 		if (datalen < sizeof(*packfile_size)) {
747 			err = got_error(GOT_ERR_PRIVSEP_MSG);
748 			break;
749 		}
750 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
751 		break;
752 	case GOT_IMSG_FETCH_DONE:
753 		*id = malloc(sizeof(**id));
754 		if (*id == NULL) {
755 			err = got_error_from_errno("malloc");
756 			break;
757 		}
758 		if (datalen != SHA1_DIGEST_LENGTH) {
759 			err = got_error(GOT_ERR_PRIVSEP_MSG);
760 			break;
761 		}
762 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
763 		*done = 1;
764 		break;
765 	default:
766 		err = got_error(GOT_ERR_PRIVSEP_MSG);
767 		break;
768 	}
769 done:
770 	if (err) {
771 		free(*id);
772 		*id = NULL;
773 		free(*refname);
774 		*refname = NULL;
775 	}
776 	imsg_free(&imsg);
777 	return err;
778 }
779 
780 const struct got_error *
781 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_hash,
782     int fd)
783 {
784 	const struct got_error *err = NULL;
785 
786 	/* Keep in sync with struct got_imsg_index_pack_request */
787 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
788 	    pack_hash, SHA1_DIGEST_LENGTH) == -1) {
789 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
790 		close(fd);
791 		return err;
792 	}
793 	return flush_imsg(ibuf);
794 }
795 
796 const struct got_error *
797 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
798 {
799 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
800 }
801 
802 const struct got_error *
803 got_privsep_send_index_pack_progress(struct imsgbuf *ibuf, int nobj_total,
804     int nobj_indexed, int nobj_loose, int nobj_resolved)
805 {
806 	struct got_imsg_index_pack_progress iprogress;
807 
808 	iprogress.nobj_total = nobj_total;
809 	iprogress.nobj_indexed = nobj_indexed;
810 	iprogress.nobj_loose = nobj_loose;
811 	iprogress.nobj_resolved = nobj_resolved;
812 
813 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_PROGRESS, 0, 0, -1,
814 	    &iprogress, sizeof(iprogress)) == -1)
815 		return got_error_from_errno("imsg_compose IDXPACK_PROGRESS");
816 
817 	return flush_imsg(ibuf);
818 }
819 
820 const struct got_error *
821 got_privsep_send_index_pack_done(struct imsgbuf *ibuf)
822 {
823 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_DONE, 0, 0, -1, NULL, 0) == -1)
824 		return got_error_from_errno("imsg_compose FETCH");
825 	return flush_imsg(ibuf);
826 }
827 
828 const struct got_error *
829 got_privsep_recv_index_progress(int *done, int *nobj_total,
830     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
831     struct imsgbuf *ibuf)
832 {
833 	const struct got_error *err = NULL;
834 	struct imsg imsg;
835 	struct got_imsg_index_pack_progress *iprogress;
836 	size_t datalen;
837 
838 	*done = 0;
839 	*nobj_total = 0;
840 	*nobj_indexed = 0;
841 	*nobj_resolved = 0;
842 
843 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
844 	if (err)
845 		return err;
846 
847 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
848 	switch (imsg.hdr.type) {
849 	case GOT_IMSG_ERROR:
850 		if (datalen < sizeof(struct got_imsg_error)) {
851 			err = got_error(GOT_ERR_PRIVSEP_LEN);
852 			break;
853 		}
854 		err = recv_imsg_error(&imsg, datalen);
855 		break;
856 	case GOT_IMSG_IDXPACK_PROGRESS:
857 		if (datalen < sizeof(*iprogress)) {
858 			err = got_error(GOT_ERR_PRIVSEP_LEN);
859 			break;
860 		}
861 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
862 		*nobj_total = iprogress->nobj_total;
863 		*nobj_indexed = iprogress->nobj_indexed;
864 		*nobj_loose = iprogress->nobj_loose;
865 		*nobj_resolved = iprogress->nobj_resolved;
866 		break;
867 	case GOT_IMSG_IDXPACK_DONE:
868 		if (datalen != 0) {
869 			err = got_error(GOT_ERR_PRIVSEP_LEN);
870 			break;
871 		}
872 		*done = 1;
873 		break;
874 	default:
875 		err = got_error(GOT_ERR_PRIVSEP_MSG);
876 		break;
877 	}
878 
879 	imsg_free(&imsg);
880 	return err;
881 }
882 
883 const struct got_error *
884 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
885     struct imsgbuf *ibuf)
886 {
887 	const struct got_error *err = NULL;
888 	struct got_imsg_object *iobj;
889 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
890 
891 	if (datalen != sizeof(*iobj))
892 		return got_error(GOT_ERR_PRIVSEP_LEN);
893 	iobj = imsg->data;
894 
895 	*obj = calloc(1, sizeof(**obj));
896 	if (*obj == NULL)
897 		return got_error_from_errno("calloc");
898 
899 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
900 	(*obj)->type = iobj->type;
901 	(*obj)->flags = iobj->flags;
902 	(*obj)->hdrlen = iobj->hdrlen;
903 	(*obj)->size = iobj->size;
904 	/* path_packfile is handled by caller */
905 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
906 		(*obj)->pack_offset = iobj->pack_offset;
907 		(*obj)->pack_idx = iobj->pack_idx;
908 	}
909 
910 	return err;
911 }
912 
913 const struct got_error *
914 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
915 {
916 	const struct got_error *err = NULL;
917 	struct imsg imsg;
918 	const size_t min_datalen =
919 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
920 
921 	*obj = NULL;
922 
923 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
924 	if (err)
925 		return err;
926 
927 	switch (imsg.hdr.type) {
928 	case GOT_IMSG_OBJECT:
929 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
930 		break;
931 	default:
932 		err = got_error(GOT_ERR_PRIVSEP_MSG);
933 		break;
934 	}
935 
936 	imsg_free(&imsg);
937 
938 	return err;
939 }
940 
941 static const struct got_error *
942 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
943     size_t logmsg_len)
944 {
945 	const struct got_error *err = NULL;
946 	size_t offset, remain;
947 
948 	offset = 0;
949 	remain = logmsg_len;
950 	while (remain > 0) {
951 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
952 
953 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
954 		    commit->logmsg + offset, n) == -1) {
955 			err = got_error_from_errno("imsg_compose "
956 			    "COMMIT_LOGMSG");
957 			break;
958 		}
959 
960 		err = flush_imsg(ibuf);
961 		if (err)
962 			break;
963 
964 		offset += n;
965 		remain -= n;
966 	}
967 
968 	return err;
969 }
970 
971 const struct got_error *
972 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
973 {
974 	const struct got_error *err = NULL;
975 	struct got_imsg_commit_object *icommit;
976 	uint8_t *buf;
977 	size_t len, total;
978 	struct got_object_qid *qid;
979 	size_t author_len = strlen(commit->author);
980 	size_t committer_len = strlen(commit->committer);
981 	size_t logmsg_len = strlen(commit->logmsg);
982 
983 	total = sizeof(*icommit) + author_len + committer_len +
984 	    commit->nparents * SHA1_DIGEST_LENGTH;
985 
986 	buf = malloc(total);
987 	if (buf == NULL)
988 		return got_error_from_errno("malloc");
989 
990 	icommit = (struct got_imsg_commit_object *)buf;
991 	memcpy(icommit->tree_id, commit->tree_id->sha1,
992 	    sizeof(icommit->tree_id));
993 	icommit->author_len = author_len;
994 	icommit->author_time = commit->author_time;
995 	icommit->author_gmtoff = commit->author_gmtoff;
996 	icommit->committer_len = committer_len;
997 	icommit->committer_time = commit->committer_time;
998 	icommit->committer_gmtoff = commit->committer_gmtoff;
999 	icommit->logmsg_len = logmsg_len;
1000 	icommit->nparents = commit->nparents;
1001 
1002 	len = sizeof(*icommit);
1003 	memcpy(buf + len, commit->author, author_len);
1004 	len += author_len;
1005 	memcpy(buf + len, commit->committer, committer_len);
1006 	len += committer_len;
1007 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
1008 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
1009 		len += SHA1_DIGEST_LENGTH;
1010 	}
1011 
1012 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1013 		err = got_error_from_errno("imsg_compose COMMIT");
1014 		goto done;
1015 	}
1016 
1017 	if (logmsg_len == 0 ||
1018 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1019 		err = flush_imsg(ibuf);
1020 		if (err)
1021 			goto done;
1022 	}
1023 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1024 done:
1025 	free(buf);
1026 	return err;
1027 }
1028 
1029 static const struct got_error *
1030 get_commit_from_imsg(struct got_commit_object **commit,
1031     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1032 {
1033 	const struct got_error *err = NULL;
1034 	struct got_imsg_commit_object *icommit;
1035 	size_t len = 0;
1036 	int i;
1037 
1038 	if (datalen < sizeof(*icommit))
1039 		return got_error(GOT_ERR_PRIVSEP_LEN);
1040 
1041 	icommit = imsg->data;
1042 	if (datalen != sizeof(*icommit) + icommit->author_len +
1043 	    icommit->committer_len +
1044 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1045 		return got_error(GOT_ERR_PRIVSEP_LEN);
1046 
1047 	if (icommit->nparents < 0)
1048 		return got_error(GOT_ERR_PRIVSEP_LEN);
1049 
1050 	len += sizeof(*icommit);
1051 
1052 	*commit = got_object_commit_alloc_partial();
1053 	if (*commit == NULL)
1054 		return got_error_from_errno(
1055 		    "got_object_commit_alloc_partial");
1056 
1057 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1058 	    SHA1_DIGEST_LENGTH);
1059 	(*commit)->author_time = icommit->author_time;
1060 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1061 	(*commit)->committer_time = icommit->committer_time;
1062 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1063 
1064 	if (icommit->author_len == 0) {
1065 		(*commit)->author = strdup("");
1066 		if ((*commit)->author == NULL) {
1067 			err = got_error_from_errno("strdup");
1068 			goto done;
1069 		}
1070 	} else {
1071 		(*commit)->author = malloc(icommit->author_len + 1);
1072 		if ((*commit)->author == NULL) {
1073 			err = got_error_from_errno("malloc");
1074 			goto done;
1075 		}
1076 		memcpy((*commit)->author, imsg->data + len,
1077 		    icommit->author_len);
1078 		(*commit)->author[icommit->author_len] = '\0';
1079 	}
1080 	len += icommit->author_len;
1081 
1082 	if (icommit->committer_len == 0) {
1083 		(*commit)->committer = strdup("");
1084 		if ((*commit)->committer == NULL) {
1085 			err = got_error_from_errno("strdup");
1086 			goto done;
1087 		}
1088 	} else {
1089 		(*commit)->committer =
1090 		    malloc(icommit->committer_len + 1);
1091 		if ((*commit)->committer == NULL) {
1092 			err = got_error_from_errno("malloc");
1093 			goto done;
1094 		}
1095 		memcpy((*commit)->committer, imsg->data + len,
1096 		    icommit->committer_len);
1097 		(*commit)->committer[icommit->committer_len] = '\0';
1098 	}
1099 	len += icommit->committer_len;
1100 
1101 	if (icommit->logmsg_len == 0) {
1102 		(*commit)->logmsg = strdup("");
1103 		if ((*commit)->logmsg == NULL) {
1104 			err = got_error_from_errno("strdup");
1105 			goto done;
1106 		}
1107 	} else {
1108 		size_t offset = 0, remain = icommit->logmsg_len;
1109 
1110 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1111 		if ((*commit)->logmsg == NULL) {
1112 			err = got_error_from_errno("malloc");
1113 			goto done;
1114 		}
1115 		while (remain > 0) {
1116 			struct imsg imsg_log;
1117 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1118 			    remain);
1119 
1120 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1121 			if (err)
1122 				goto done;
1123 
1124 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1125 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1126 				goto done;
1127 			}
1128 
1129 			memcpy((*commit)->logmsg + offset,
1130 			    imsg_log.data, n);
1131 			imsg_free(&imsg_log);
1132 			offset += n;
1133 			remain -= n;
1134 		}
1135 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1136 	}
1137 
1138 	for (i = 0; i < icommit->nparents; i++) {
1139 		struct got_object_qid *qid;
1140 
1141 		err = got_object_qid_alloc_partial(&qid);
1142 		if (err)
1143 			break;
1144 		memcpy(qid->id, imsg->data + len +
1145 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
1146 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1147 		(*commit)->nparents++;
1148 	}
1149 done:
1150 	if (err) {
1151 		got_object_commit_close(*commit);
1152 		*commit = NULL;
1153 	}
1154 	return err;
1155 }
1156 
1157 const struct got_error *
1158 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1159 {
1160 	const struct got_error *err = NULL;
1161 	struct imsg imsg;
1162 	size_t datalen;
1163 	const size_t min_datalen =
1164 	    MIN(sizeof(struct got_imsg_error),
1165 	    sizeof(struct got_imsg_commit_object));
1166 
1167 	*commit = NULL;
1168 
1169 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1170 	if (err)
1171 		return err;
1172 
1173 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1174 
1175 	switch (imsg.hdr.type) {
1176 	case GOT_IMSG_COMMIT:
1177 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1178 		break;
1179 	default:
1180 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1181 		break;
1182 	}
1183 
1184 	imsg_free(&imsg);
1185 
1186 	return err;
1187 }
1188 
1189 const struct got_error *
1190 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
1191     int nentries)
1192 {
1193 	const struct got_error *err = NULL;
1194 	struct got_imsg_tree_object itree;
1195 	struct got_pathlist_entry *pe;
1196 	size_t totlen;
1197 	int nimsg; /* number of imsg queued in ibuf */
1198 
1199 	itree.nentries = nentries;
1200 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1201 	    == -1)
1202 		return got_error_from_errno("imsg_compose TREE");
1203 
1204 	totlen = sizeof(itree);
1205 	nimsg = 1;
1206 	TAILQ_FOREACH(pe, entries, entry) {
1207 		const char *name = pe->path;
1208 		struct got_parsed_tree_entry *pte = pe->data;
1209 		struct ibuf *wbuf;
1210 		size_t namelen = strlen(name);
1211 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
1212 
1213 		if (len > MAX_IMSGSIZE)
1214 			return got_error(GOT_ERR_NO_SPACE);
1215 
1216 		nimsg++;
1217 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
1218 			err = flush_imsg(ibuf);
1219 			if (err)
1220 				return err;
1221 			nimsg = 0;
1222 		}
1223 
1224 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
1225 		if (wbuf == NULL)
1226 			return got_error_from_errno("imsg_create TREE_ENTRY");
1227 
1228 		/* Keep in sync with struct got_imsg_tree_object definition! */
1229 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
1230 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1231 			ibuf_free(wbuf);
1232 			return err;
1233 		}
1234 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
1235 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1236 			ibuf_free(wbuf);
1237 			return err;
1238 		}
1239 
1240 		if (imsg_add(wbuf, name, namelen) == -1) {
1241 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1242 			ibuf_free(wbuf);
1243 			return err;
1244 		}
1245 
1246 		wbuf->fd = -1;
1247 		imsg_close(ibuf, wbuf);
1248 
1249 		totlen += len;
1250 	}
1251 
1252 	return flush_imsg(ibuf);
1253 }
1254 
1255 const struct got_error *
1256 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1257 {
1258 	const struct got_error *err = NULL;
1259 	const size_t min_datalen =
1260 	    MIN(sizeof(struct got_imsg_error),
1261 	    sizeof(struct got_imsg_tree_object));
1262 	struct got_imsg_tree_object *itree;
1263 	int nentries = 0;
1264 
1265 	*tree = NULL;
1266 get_more:
1267 	err = read_imsg(ibuf);
1268 	if (err)
1269 		goto done;
1270 
1271 	for (;;) {
1272 		struct imsg imsg;
1273 		size_t n;
1274 		size_t datalen;
1275 		struct got_imsg_tree_entry *ite;
1276 		struct got_tree_entry *te = NULL;
1277 
1278 		n = imsg_get(ibuf, &imsg);
1279 		if (n == 0) {
1280 			if (*tree && (*tree)->nentries != nentries)
1281 				goto get_more;
1282 			break;
1283 		}
1284 
1285 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
1286 			return got_error(GOT_ERR_PRIVSEP_LEN);
1287 
1288 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1289 
1290 		switch (imsg.hdr.type) {
1291 		case GOT_IMSG_ERROR:
1292 			err = recv_imsg_error(&imsg, datalen);
1293 			break;
1294 		case GOT_IMSG_TREE:
1295 			/* This message should only appear once. */
1296 			if (*tree != NULL) {
1297 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1298 				break;
1299 			}
1300 			if (datalen != sizeof(*itree)) {
1301 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1302 				break;
1303 			}
1304 			itree = imsg.data;
1305 			*tree = malloc(sizeof(**tree));
1306 			if (*tree == NULL) {
1307 				err = got_error_from_errno("malloc");
1308 				break;
1309 			}
1310 			(*tree)->entries = calloc(itree->nentries,
1311 			    sizeof(struct got_tree_entry));
1312 			if ((*tree)->entries == NULL) {
1313 				err = got_error_from_errno("malloc");
1314 				break;
1315 			}
1316 			(*tree)->nentries = itree->nentries;
1317 			(*tree)->refcnt = 0;
1318 			break;
1319 		case GOT_IMSG_TREE_ENTRY:
1320 			/* This message should be preceeded by GOT_IMSG_TREE. */
1321 			if (*tree == NULL) {
1322 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1323 				break;
1324 			}
1325 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
1326 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1327 				break;
1328 			}
1329 
1330 			/* Remaining data contains the entry's name. */
1331 			datalen -= sizeof(*ite);
1332 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
1333 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1334 				break;
1335 			}
1336 			ite = imsg.data;
1337 
1338 			if (datalen + 1 > sizeof(te->name)) {
1339 				err = got_error(GOT_ERR_NO_SPACE);
1340 				break;
1341 			}
1342 			te = &(*tree)->entries[nentries];
1343 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
1344 			te->name[datalen] = '\0';
1345 
1346 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
1347 			te->mode = ite->mode;
1348 			te->idx = nentries;
1349 			nentries++;
1350 			break;
1351 		default:
1352 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1353 			break;
1354 		}
1355 
1356 		imsg_free(&imsg);
1357 	}
1358 done:
1359 	if (*tree && (*tree)->nentries != nentries) {
1360 		if (err == NULL)
1361 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1362 		got_object_tree_close(*tree);
1363 		*tree = NULL;
1364 	}
1365 
1366 	return err;
1367 }
1368 
1369 const struct got_error *
1370 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1371     const uint8_t *data)
1372 {
1373 	struct got_imsg_blob iblob;
1374 
1375 	iblob.size = size;
1376 	iblob.hdrlen = hdrlen;
1377 
1378 	if (data) {
1379 		uint8_t *buf;
1380 
1381 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1382 			return got_error(GOT_ERR_NO_SPACE);
1383 
1384 		buf = malloc(sizeof(iblob) + size);
1385 		if (buf == NULL)
1386 			return got_error_from_errno("malloc");
1387 
1388 		memcpy(buf, &iblob, sizeof(iblob));
1389 		memcpy(buf + sizeof(iblob), data, size);
1390 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1391 		   sizeof(iblob) + size) == -1) {
1392 			free(buf);
1393 			return got_error_from_errno("imsg_compose BLOB");
1394 		}
1395 		free(buf);
1396 	} else {
1397 		/* Data has already been written to file descriptor. */
1398 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1399 		    sizeof(iblob)) == -1)
1400 			return got_error_from_errno("imsg_compose BLOB");
1401 	}
1402 
1403 
1404 	return flush_imsg(ibuf);
1405 }
1406 
1407 const struct got_error *
1408 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1409     struct imsgbuf *ibuf)
1410 {
1411 	const struct got_error *err = NULL;
1412 	struct imsg imsg;
1413 	struct got_imsg_blob *iblob;
1414 	size_t datalen;
1415 
1416 	*outbuf = NULL;
1417 
1418 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1419 	if (err)
1420 		return err;
1421 
1422 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1423 
1424 	switch (imsg.hdr.type) {
1425 	case GOT_IMSG_BLOB:
1426 		if (datalen < sizeof(*iblob)) {
1427 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1428 			break;
1429 		}
1430 		iblob = imsg.data;
1431 		*size = iblob->size;
1432 		*hdrlen = iblob->hdrlen;
1433 
1434 		if (datalen == sizeof(*iblob)) {
1435 			/* Data has been written to file descriptor. */
1436 			break;
1437 		}
1438 
1439 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1440 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1441 			break;
1442 		}
1443 
1444 		*outbuf = malloc(*size);
1445 		if (*outbuf == NULL) {
1446 			err = got_error_from_errno("malloc");
1447 			break;
1448 		}
1449 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1450 		break;
1451 	default:
1452 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1453 		break;
1454 	}
1455 
1456 	imsg_free(&imsg);
1457 
1458 	return err;
1459 }
1460 
1461 static const struct got_error *
1462 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1463 {
1464 	const struct got_error *err = NULL;
1465 	size_t offset, remain;
1466 
1467 	offset = 0;
1468 	remain = tagmsg_len;
1469 	while (remain > 0) {
1470 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1471 
1472 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1473 		    tag->tagmsg + offset, n) == -1) {
1474 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1475 			break;
1476 		}
1477 
1478 		err = flush_imsg(ibuf);
1479 		if (err)
1480 			break;
1481 
1482 		offset += n;
1483 		remain -= n;
1484 	}
1485 
1486 	return err;
1487 }
1488 
1489 const struct got_error *
1490 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1491 {
1492 	const struct got_error *err = NULL;
1493 	struct got_imsg_tag_object *itag;
1494 	uint8_t *buf;
1495 	size_t len, total;
1496 	size_t tag_len = strlen(tag->tag);
1497 	size_t tagger_len = strlen(tag->tagger);
1498 	size_t tagmsg_len = strlen(tag->tagmsg);
1499 
1500 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1501 
1502 	buf = malloc(total);
1503 	if (buf == NULL)
1504 		return got_error_from_errno("malloc");
1505 
1506 	itag = (struct got_imsg_tag_object *)buf;
1507 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1508 	itag->obj_type = tag->obj_type;
1509 	itag->tag_len = tag_len;
1510 	itag->tagger_len = tagger_len;
1511 	itag->tagger_time = tag->tagger_time;
1512 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1513 	itag->tagmsg_len = tagmsg_len;
1514 
1515 	len = sizeof(*itag);
1516 	memcpy(buf + len, tag->tag, tag_len);
1517 	len += tag_len;
1518 	memcpy(buf + len, tag->tagger, tagger_len);
1519 	len += tagger_len;
1520 
1521 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1522 		err = got_error_from_errno("imsg_compose TAG");
1523 		goto done;
1524 	}
1525 
1526 	if (tagmsg_len == 0 ||
1527 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1528 		err = flush_imsg(ibuf);
1529 		if (err)
1530 			goto done;
1531 	}
1532 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1533 done:
1534 	free(buf);
1535 	return err;
1536 }
1537 
1538 const struct got_error *
1539 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1540 {
1541 	const struct got_error *err = NULL;
1542 	struct imsg imsg;
1543 	struct got_imsg_tag_object *itag;
1544 	size_t len, datalen;
1545 	const size_t min_datalen =
1546 	    MIN(sizeof(struct got_imsg_error),
1547 	    sizeof(struct got_imsg_tag_object));
1548 
1549 	*tag = NULL;
1550 
1551 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1552 	if (err)
1553 		return err;
1554 
1555 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1556 	len = 0;
1557 
1558 	switch (imsg.hdr.type) {
1559 	case GOT_IMSG_TAG:
1560 		if (datalen < sizeof(*itag)) {
1561 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1562 			break;
1563 		}
1564 		itag = imsg.data;
1565 		if (datalen != sizeof(*itag) + itag->tag_len +
1566 		    itag->tagger_len) {
1567 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1568 			break;
1569 		}
1570 		len += sizeof(*itag);
1571 
1572 		*tag = calloc(1, sizeof(**tag));
1573 		if (*tag == NULL) {
1574 			err = got_error_from_errno("calloc");
1575 			break;
1576 		}
1577 
1578 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1579 
1580 		if (itag->tag_len == 0) {
1581 			(*tag)->tag = strdup("");
1582 			if ((*tag)->tag == NULL) {
1583 				err = got_error_from_errno("strdup");
1584 				break;
1585 			}
1586 		} else {
1587 			(*tag)->tag = malloc(itag->tag_len + 1);
1588 			if ((*tag)->tag == NULL) {
1589 				err = got_error_from_errno("malloc");
1590 				break;
1591 			}
1592 			memcpy((*tag)->tag, imsg.data + len,
1593 			    itag->tag_len);
1594 			(*tag)->tag[itag->tag_len] = '\0';
1595 		}
1596 		len += itag->tag_len;
1597 
1598 		(*tag)->obj_type = itag->obj_type;
1599 		(*tag)->tagger_time = itag->tagger_time;
1600 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1601 
1602 		if (itag->tagger_len == 0) {
1603 			(*tag)->tagger = strdup("");
1604 			if ((*tag)->tagger == NULL) {
1605 				err = got_error_from_errno("strdup");
1606 				break;
1607 			}
1608 		} else {
1609 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1610 			if ((*tag)->tagger == NULL) {
1611 				err = got_error_from_errno("malloc");
1612 				break;
1613 			}
1614 			memcpy((*tag)->tagger, imsg.data + len,
1615 			    itag->tagger_len);
1616 			(*tag)->tagger[itag->tagger_len] = '\0';
1617 		}
1618 		len += itag->tagger_len;
1619 
1620 		if (itag->tagmsg_len == 0) {
1621 			(*tag)->tagmsg = strdup("");
1622 			if ((*tag)->tagmsg == NULL) {
1623 				err = got_error_from_errno("strdup");
1624 				break;
1625 			}
1626 		} else {
1627 			size_t offset = 0, remain = itag->tagmsg_len;
1628 
1629 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1630 			if ((*tag)->tagmsg == NULL) {
1631 				err = got_error_from_errno("malloc");
1632 				break;
1633 			}
1634 			while (remain > 0) {
1635 				struct imsg imsg_log;
1636 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1637 				    remain);
1638 
1639 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1640 				if (err)
1641 					return err;
1642 
1643 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1644 					return got_error(GOT_ERR_PRIVSEP_MSG);
1645 
1646 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1647 				    n);
1648 				imsg_free(&imsg_log);
1649 				offset += n;
1650 				remain -= n;
1651 			}
1652 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1653 		}
1654 
1655 		break;
1656 	default:
1657 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1658 		break;
1659 	}
1660 
1661 	imsg_free(&imsg);
1662 
1663 	return err;
1664 }
1665 
1666 const struct got_error *
1667 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1668     struct got_packidx *packidx)
1669 {
1670 	const struct got_error *err = NULL;
1671 	struct got_imsg_packidx ipackidx;
1672 	struct got_imsg_pack ipack;
1673 	int fd;
1674 
1675 	ipackidx.len = packidx->len;
1676 	fd = dup(packidx->fd);
1677 	if (fd == -1)
1678 		return got_error_from_errno("dup");
1679 
1680 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1681 	    sizeof(ipackidx)) == -1) {
1682 		err = got_error_from_errno("imsg_compose PACKIDX");
1683 		close(fd);
1684 		return err;
1685 	}
1686 
1687 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1688 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1689 		return got_error(GOT_ERR_NO_SPACE);
1690 	ipack.filesize = pack->filesize;
1691 
1692 	fd = dup(pack->fd);
1693 	if (fd == -1)
1694 		return got_error_from_errno("dup");
1695 
1696 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1697 	    == -1) {
1698 		err = got_error_from_errno("imsg_compose PACK");
1699 		close(fd);
1700 		return err;
1701 	}
1702 
1703 	return flush_imsg(ibuf);
1704 }
1705 
1706 const struct got_error *
1707 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1708     struct got_object_id *id)
1709 {
1710 	struct got_imsg_packed_object iobj;
1711 
1712 	iobj.idx = idx;
1713 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1714 
1715 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1716 	    &iobj, sizeof(iobj)) == -1)
1717 		return got_error_from_errno("imsg_compose "
1718 		    "PACKED_OBJECT_REQUEST");
1719 
1720 	return flush_imsg(ibuf);
1721 }
1722 
1723 const struct got_error *
1724 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1725 {
1726 	const struct got_error *err = NULL;
1727 
1728 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1729 	    NULL, 0) == -1) {
1730 		err = got_error_from_errno("imsg_compose "
1731 		    "GITCONFIG_PARSE_REQUEST");
1732 		close(fd);
1733 		return err;
1734 	}
1735 
1736 	return flush_imsg(ibuf);
1737 }
1738 
1739 const struct got_error *
1740 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1741 {
1742 	if (imsg_compose(ibuf,
1743 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1744 	    NULL, 0) == -1)
1745 		return got_error_from_errno("imsg_compose "
1746 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1747 
1748 	return flush_imsg(ibuf);
1749 }
1750 
1751 const struct got_error *
1752 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1753 {
1754 	if (imsg_compose(ibuf,
1755 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1756 		return got_error_from_errno("imsg_compose "
1757 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1758 
1759 	return flush_imsg(ibuf);
1760 }
1761 
1762 const struct got_error *
1763 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1764 {
1765 	if (imsg_compose(ibuf,
1766 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1767 		return got_error_from_errno("imsg_compose "
1768 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1769 
1770 	return flush_imsg(ibuf);
1771 }
1772 
1773 const struct got_error *
1774 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1775 {
1776 	if (imsg_compose(ibuf,
1777 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1778 		return got_error_from_errno("imsg_compose "
1779 		    "GITCONFIG_REMOTE_REQUEST");
1780 
1781 	return flush_imsg(ibuf);
1782 }
1783 
1784 const struct got_error *
1785 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
1786 {
1787 	if (imsg_compose(ibuf,
1788 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
1789 		return got_error_from_errno("imsg_compose "
1790 		    "GITCONFIG_OWNER_REQUEST");
1791 
1792 	return flush_imsg(ibuf);
1793 }
1794 
1795 const struct got_error *
1796 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1797 {
1798 	size_t len = value ? strlen(value) + 1 : 0;
1799 
1800 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1801 	    value, len) == -1)
1802 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1803 
1804 	return flush_imsg(ibuf);
1805 }
1806 
1807 const struct got_error *
1808 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1809 {
1810 	const struct got_error *err = NULL;
1811 	struct imsg imsg;
1812 	size_t datalen;
1813 	const size_t min_datalen = 0;
1814 
1815 	*str = NULL;
1816 
1817 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1818 	if (err)
1819 		return err;
1820 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1821 
1822 	switch (imsg.hdr.type) {
1823 	case GOT_IMSG_GITCONFIG_STR_VAL:
1824 		if (datalen == 0)
1825 			break;
1826 		*str = malloc(datalen);
1827 		if (*str == NULL) {
1828 			err = got_error_from_errno("malloc");
1829 			break;
1830 		}
1831 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1832 			err = got_error(GOT_ERR_NO_SPACE);
1833 		break;
1834 	default:
1835 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1836 		break;
1837 	}
1838 
1839 	imsg_free(&imsg);
1840 	return err;
1841 }
1842 
1843 const struct got_error *
1844 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1845 {
1846 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1847 	    &value, sizeof(value)) == -1)
1848 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1849 
1850 	return flush_imsg(ibuf);
1851 }
1852 
1853 const struct got_error *
1854 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1855 {
1856 	const struct got_error *err = NULL;
1857 	struct imsg imsg;
1858 	size_t datalen;
1859 	const size_t min_datalen =
1860 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1861 
1862 	*val = 0;
1863 
1864 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1865 	if (err)
1866 		return err;
1867 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1868 
1869 	switch (imsg.hdr.type) {
1870 	case GOT_IMSG_GITCONFIG_INT_VAL:
1871 		if (datalen != sizeof(*val)) {
1872 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1873 			break;
1874 		}
1875 		memcpy(val, imsg.data, sizeof(*val));
1876 		break;
1877 	default:
1878 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1879 		break;
1880 	}
1881 
1882 	imsg_free(&imsg);
1883 	return err;
1884 }
1885 
1886 const struct got_error *
1887 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1888     struct got_remote_repo *remotes, int nremotes)
1889 {
1890 	const struct got_error *err = NULL;
1891 	struct got_imsg_remotes iremotes;
1892 	int i;
1893 
1894 	iremotes.nremotes = nremotes;
1895 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1896 	    &iremotes, sizeof(iremotes)) == -1)
1897 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1898 
1899 	err = flush_imsg(ibuf);
1900 	imsg_clear(ibuf);
1901 	if (err)
1902 		return err;
1903 
1904 	for (i = 0; i < nremotes; i++) {
1905 		struct got_imsg_remote iremote;
1906 		size_t len = sizeof(iremote);
1907 		struct ibuf *wbuf;
1908 
1909 		iremote.name_len = strlen(remotes[i].name);
1910 		len += iremote.name_len;
1911 		iremote.url_len = strlen(remotes[i].url);
1912 		len += iremote.url_len;
1913 
1914 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1915 		if (wbuf == NULL)
1916 			return got_error_from_errno(
1917 			    "imsg_create GITCONFIG_REMOTE");
1918 
1919 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1920 			err = got_error_from_errno(
1921 			    "imsg_add GITCONFIG_REMOTE");
1922 			ibuf_free(wbuf);
1923 			return err;
1924 		}
1925 
1926 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1927 			err = got_error_from_errno(
1928 			    "imsg_add GITCONFIG_REMOTE");
1929 			ibuf_free(wbuf);
1930 			return err;
1931 		}
1932 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1933 			err = got_error_from_errno(
1934 			    "imsg_add GITCONFIG_REMOTE");
1935 			ibuf_free(wbuf);
1936 			return err;
1937 		}
1938 		if (imsg_add(wbuf, &remotes[i].mirror_references,
1939 		    sizeof(iremote.mirror_references)) == -1) {
1940 			err = got_error_from_errno(
1941 			    "imsg_add GITCONFIG_REMOTE");
1942 			ibuf_free(wbuf);
1943 			return err;
1944 		}
1945 
1946 		wbuf->fd = -1;
1947 		imsg_close(ibuf, wbuf);
1948 		err = flush_imsg(ibuf);
1949 		if (err)
1950 			return err;
1951 	}
1952 
1953 	return NULL;
1954 }
1955 
1956 const struct got_error *
1957 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1958     int *nremotes, struct imsgbuf *ibuf)
1959 {
1960 	const struct got_error *err = NULL;
1961 	struct imsg imsg;
1962 	size_t datalen;
1963 	struct got_imsg_remotes iremotes;
1964 	struct got_imsg_remote iremote;
1965 
1966 	*remotes = NULL;
1967 	*nremotes = 0;
1968 	iremotes.nremotes = 0;
1969 
1970 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
1971 	if (err)
1972 		return err;
1973 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1974 
1975 	switch (imsg.hdr.type) {
1976 	case GOT_IMSG_GITCONFIG_REMOTES:
1977 		if (datalen != sizeof(iremotes)) {
1978 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1979 			break;
1980 		}
1981 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
1982 		if (iremotes.nremotes == 0) {
1983 			imsg_free(&imsg);
1984 			return NULL;
1985 		}
1986 		break;
1987 	default:
1988 		imsg_free(&imsg);
1989 		return got_error(GOT_ERR_PRIVSEP_MSG);
1990 	}
1991 
1992 	imsg_free(&imsg);
1993 
1994 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(iremote));
1995 	if (*remotes == NULL)
1996 		return got_error_from_errno("recallocarray");
1997 
1998 	while (*nremotes < iremotes.nremotes) {
1999 		struct got_remote_repo *remote;
2000 	
2001 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2002 		if (err)
2003 			break;
2004 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2005 
2006 		switch (imsg.hdr.type) {
2007 		case GOT_IMSG_GITCONFIG_REMOTE:
2008 			remote = &(*remotes)[*nremotes];
2009 			if (datalen < sizeof(iremote)) {
2010 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2011 				break;
2012 			}
2013 			memcpy(&iremote, imsg.data, sizeof(iremote));
2014 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
2015 			    (sizeof(iremote) + iremote.name_len +
2016 			    iremote.url_len) > datalen) {
2017 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2018 				break;
2019 			}
2020 			remote->name = strndup(imsg.data + sizeof(iremote),
2021 			    iremote.name_len);
2022 			if (remote->name == NULL) {
2023 				err = got_error_from_errno("strndup");
2024 				break;
2025 			}
2026 			remote->url = strndup(imsg.data + sizeof(iremote) +
2027 			    iremote.name_len, iremote.url_len);
2028 			if (remote->url == NULL) {
2029 				err = got_error_from_errno("strndup");
2030 				free(remote->name);
2031 				break;
2032 			}
2033 			remote->mirror_references = iremote.mirror_references;
2034 			(*nremotes)++;
2035 			break;
2036 		default:
2037 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2038 			break;
2039 		}
2040 
2041 		imsg_free(&imsg);
2042 		if (err)
2043 			break;
2044 	}
2045 
2046 	if (err) {
2047 		int i;
2048 		for (i = 0; i < *nremotes; i++) {
2049 			free((*remotes)[i].name);
2050 			free((*remotes)[i].url);
2051 		}
2052 		free(*remotes);
2053 		*remotes = NULL;
2054 		*nremotes = 0;
2055 	}
2056 	return err;
2057 }
2058 
2059 const struct got_error *
2060 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2061      struct got_object_id *id, int idx, const char *path)
2062 {
2063 	const struct got_error *err = NULL;
2064 	struct ibuf *wbuf;
2065 	size_t path_len = strlen(path) + 1;
2066 
2067 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2068 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2069 	if (wbuf == NULL)
2070 		return got_error_from_errno(
2071 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2072 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2073 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2074 		ibuf_free(wbuf);
2075 		return err;
2076 	}
2077 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
2078 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2079 		ibuf_free(wbuf);
2080 		return err;
2081 	}
2082 	if (imsg_add(wbuf, path, path_len) == -1) {
2083 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2084 		ibuf_free(wbuf);
2085 		return err;
2086 	}
2087 
2088 	wbuf->fd = -1;
2089 	imsg_close(ibuf, wbuf);
2090 
2091 	return flush_imsg(ibuf);
2092 }
2093 
2094 const struct got_error *
2095 got_privsep_send_traversed_commits(struct got_object_id *commit_ids, 
2096     size_t ncommits, struct imsgbuf *ibuf)
2097 {
2098 	const struct got_error *err;
2099 	struct ibuf *wbuf;
2100 	int i;
2101 
2102 	wbuf = imsg_create(ibuf, GOT_IMSG_TRAVERSED_COMMITS, 0, 0,
2103 	    sizeof(struct got_imsg_traversed_commits) +
2104 	    ncommits * SHA1_DIGEST_LENGTH);
2105 	if (wbuf == NULL)
2106 		return got_error_from_errno("imsg_create TRAVERSED_COMMITS");
2107 
2108 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1) {
2109 		err = got_error_from_errno("imsg_add TRAVERSED_COMMITS");
2110 		ibuf_free(wbuf);
2111 		return err;
2112 	}
2113 	for (i = 0; i < ncommits; i++) {
2114 		struct got_object_id *id = &commit_ids[i];
2115 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2116 			err = got_error_from_errno(
2117 			    "imsg_add TRAVERSED_COMMITS");
2118 			ibuf_free(wbuf);
2119 			return err;
2120 		}
2121 	}
2122 
2123 	wbuf->fd = -1;
2124 	imsg_close(ibuf, wbuf);
2125 
2126 	return flush_imsg(ibuf);
2127 }
2128 
2129 const struct got_error *
2130 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2131     struct got_object_id **changed_commit_id,
2132     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2133 {
2134 	const struct got_error *err = NULL;
2135 	struct imsg imsg;
2136 	struct got_imsg_traversed_commits *icommits;
2137 	size_t datalen;
2138 	int i, done = 0;
2139 
2140 	*changed_commit = NULL;
2141 	*changed_commit_id = NULL;
2142 
2143 	while (!done) {
2144 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2145 		if (err)
2146 			return err;
2147 
2148 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2149 		switch (imsg.hdr.type) {
2150 		case GOT_IMSG_TRAVERSED_COMMITS:
2151 			icommits = imsg.data;
2152 			if (datalen != sizeof(*icommits) +
2153 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2154 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2155 				break;
2156 			}
2157 			for (i = 0; i < icommits->ncommits; i++) {
2158 				struct got_object_qid *qid;
2159 				uint8_t *sha1 = (uint8_t *)imsg.data +
2160 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2161 				err = got_object_qid_alloc_partial(&qid);
2162 				if (err)
2163 					break;
2164 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
2165 				SIMPLEQ_INSERT_TAIL(commit_ids, qid, entry);
2166 
2167 				/* The last commit may contain a change. */
2168 				if (i == icommits->ncommits - 1) {
2169 					*changed_commit_id =
2170 					    got_object_id_dup(qid->id);
2171 					if (*changed_commit_id == NULL) {
2172 						err = got_error_from_errno(
2173 						    "got_object_id_dup");
2174 						break;
2175 					}
2176 				}
2177 			}
2178 			break;
2179 		case GOT_IMSG_COMMIT:
2180 			if (*changed_commit_id == NULL) {
2181 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2182 				break;
2183 			}
2184 			err = get_commit_from_imsg(changed_commit, &imsg,
2185 			    datalen, ibuf);
2186 			break;
2187 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2188 			done = 1;
2189 			break;
2190 		default:
2191 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2192 			break;
2193 		}
2194 
2195 		imsg_free(&imsg);
2196 		if (err)
2197 			break;
2198 	}
2199 
2200 	if (err)
2201 		got_object_id_queue_free(commit_ids);
2202 	return err;
2203 }
2204 
2205 const struct got_error *
2206 got_privsep_send_commit_traversal_done(struct imsgbuf *ibuf)
2207 {
2208 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_DONE, 0, 0, -1,
2209 	    NULL, 0) == -1)
2210 		return got_error_from_errno("imsg_compose TRAVERSAL_DONE");
2211 
2212 	return flush_imsg(ibuf);
2213 }
2214 
2215 const struct got_error *
2216 got_privsep_unveil_exec_helpers(void)
2217 {
2218 	const char *helpers[] = {
2219 	    GOT_PATH_PROG_READ_PACK,
2220 	    GOT_PATH_PROG_READ_OBJECT,
2221 	    GOT_PATH_PROG_READ_COMMIT,
2222 	    GOT_PATH_PROG_READ_TREE,
2223 	    GOT_PATH_PROG_READ_BLOB,
2224 	    GOT_PATH_PROG_READ_TAG,
2225 	    GOT_PATH_PROG_READ_GITCONFIG,
2226 	    GOT_PATH_PROG_FETCH_PACK,
2227 	    GOT_PATH_PROG_INDEX_PACK,
2228 	};
2229 	int i;
2230 
2231 	for (i = 0; i < nitems(helpers); i++) {
2232 		if (unveil(helpers[i], "x") == 0)
2233 			continue;
2234 		return got_error_from_errno2("unveil", helpers[i]);
2235 	}
2236 
2237 	return NULL;
2238 }
2239 
2240 void
2241 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
2242 {
2243 	if (close(imsg_fds[0]) != 0) {
2244 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2245 		_exit(1);
2246 	}
2247 
2248 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
2249 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2250 		_exit(1);
2251 	}
2252 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
2253 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2254 		_exit(1);
2255 	}
2256 
2257 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
2258 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
2259 		    strerror(errno));
2260 		_exit(1);
2261 	}
2262 }