Game of Trees Repos

Blob

Date:: Sat Mar 21 10:18:15 2020 UTC
Message:: add support for listing remote branches and tags 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, int fetch_all_branches,
416    struct got_pathlist_head *wanted_branches, int list_refs_only)
417 {
418 	const struct got_error *err = NULL;
419 	struct ibuf *wbuf;
420 	size_t len;
421 	struct got_pathlist_entry *pe;
422 	struct got_imsg_fetch_request fetchreq;
423 
424 	memset(&fetchreq, 0, sizeof(fetchreq));
425 	fetchreq.fetch_all_branches = fetch_all_branches;
426 	fetchreq.list_refs_only = list_refs_only;
427 	TAILQ_FOREACH(pe, have_refs, entry)
428 		fetchreq.n_have_refs++;
429 	TAILQ_FOREACH(pe, wanted_branches, entry)
430 		fetchreq.n_wanted_branches++;
431 	len = sizeof(struct got_imsg_fetch_request);
432 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
433 		close(fd);
434 		return got_error(GOT_ERR_NO_SPACE);
435 	}
436 
437 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, fd,
438 	    &fetchreq, sizeof(fetchreq)) == -1)
439 		return got_error_from_errno(
440 		    "imsg_compose FETCH_SERVER_PROGRESS");
441 
442 	err = flush_imsg(ibuf);
443 	if (err) {
444 		close(fd);
445 		return err;
446 	}
447 	fd = -1;
448 
449 	TAILQ_FOREACH(pe, have_refs, entry) {
450 		const char *name = pe->path;
451 		size_t name_len = pe->path_len;
452 		struct got_object_id *id = pe->data;
453 
454 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
455 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
456 		if (wbuf == NULL)
457 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
458 
459 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
460 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1) {
461 			err = got_error_from_errno("imsg_add FETCH_HAVE_REF");
462 			ibuf_free(wbuf);
463 			return err;
464 		}
465 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
466 			err = got_error_from_errno("imsg_add FETCH_HAVE_REF");
467 			ibuf_free(wbuf);
468 			return err;
469 		}
470 		if (imsg_add(wbuf, name, name_len) == -1) {
471 			err = got_error_from_errno("imsg_add FETCH_HAVE_REF");
472 			ibuf_free(wbuf);
473 			return err;
474 		}
475 
476 		wbuf->fd = -1;
477 		imsg_close(ibuf, wbuf);
478 		err = flush_imsg(ibuf);
479 		if (err)
480 			return err;
481 	}
482 
483 	TAILQ_FOREACH(pe, wanted_branches, entry) {
484 		const char *name = pe->path;
485 		size_t name_len = pe->path_len;
486 
487 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
488 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
489 		    len);
490 		if (wbuf == NULL)
491 			return got_error_from_errno(
492 			     "imsg_create FETCH_WANTED_BRANCH");
493 
494 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
495 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
496 			err = got_error_from_errno(
497 			    "imsg_add FETCH_WANTED_BRANCH");
498 			ibuf_free(wbuf);
499 			return err;
500 		}
501 		if (imsg_add(wbuf, name, name_len) == -1) {
502 			err = got_error_from_errno(
503 			     "imsg_add FETCH_WANTED_BRANCH");
504 			ibuf_free(wbuf);
505 			return err;
506 		}
507 
508 		wbuf->fd = -1;
509 		imsg_close(ibuf, wbuf);
510 		err = flush_imsg(ibuf);
511 		if (err)
512 			return err;
513 	}
514 
515 	return NULL;
516 
517 }
518 
519 const struct got_error *
520 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
521 {
522 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
523 }
524 
525 
526 const struct got_error *
527 got_privsep_send_fetch_symrefs(struct imsgbuf *ibuf,
528     struct got_pathlist_head *symrefs)
529 {
530 	const struct got_error *err = NULL;
531 	struct ibuf *wbuf;
532 	size_t len, nsymrefs = 0;
533 	struct got_pathlist_entry *pe;
534 
535 	len = sizeof(struct got_imsg_fetch_symrefs);
536 	TAILQ_FOREACH(pe, symrefs, entry) {
537 		const char *target = pe->data;
538 		len += sizeof(struct got_imsg_fetch_symref) +
539 		    pe->path_len + strlen(target);
540 		nsymrefs++;
541 	}
542 
543 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
544 		return got_error(GOT_ERR_NO_SPACE);
545 
546 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_SYMREFS, 0, 0, len);
547 	if (wbuf == NULL)
548 		return got_error_from_errno("imsg_create FETCH_SYMREFS");
549 
550 	/* Keep in sync with struct got_imsg_fetch_symrefs definition! */
551 	if (imsg_add(wbuf, &nsymrefs, sizeof(nsymrefs)) == -1) {
552 		err = got_error_from_errno("imsg_add FETCH_SYMREFS");
553 		ibuf_free(wbuf);
554 		return err;
555 	}
556 
557 	TAILQ_FOREACH(pe, symrefs, entry) {
558 		const char *name = pe->path;
559 		size_t name_len = pe->path_len;
560 		const char *target = pe->data;
561 		size_t target_len = strlen(target);
562 
563 		/* Keep in sync with struct got_imsg_fetch_symref definition! */
564 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
565 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
566 			ibuf_free(wbuf);
567 			return err;
568 		}
569 		if (imsg_add(wbuf, &target_len, sizeof(target_len)) == -1) {
570 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
571 			ibuf_free(wbuf);
572 			return err;
573 		}
574 		if (imsg_add(wbuf, name, name_len) == -1) {
575 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
576 			ibuf_free(wbuf);
577 			return err;
578 		}
579 		if (imsg_add(wbuf, target, target_len) == -1) {
580 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
581 			ibuf_free(wbuf);
582 			return err;
583 		}
584 	}
585 
586 	wbuf->fd = -1;
587 	imsg_close(ibuf, wbuf);
588 	return flush_imsg(ibuf);
589 }
590 
591 const struct got_error *
592 got_privsep_send_fetch_ref(struct imsgbuf *ibuf,
593     struct got_object_id *refid, const char *refname)
594 {
595 	const struct got_error *err = NULL;
596 	struct ibuf *wbuf;
597 	size_t len, reflen = strlen(refname);
598 
599 	len = sizeof(struct got_imsg_fetch_ref) + reflen;
600 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
601 		return got_error(GOT_ERR_NO_SPACE);
602 
603 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REF, 0, 0, len);
604 	if (wbuf == NULL)
605 		return got_error_from_errno("imsg_create FETCH_REF");
606 
607 	/* Keep in sync with struct got_imsg_fetch_ref definition! */
608 	if (imsg_add(wbuf, refid->sha1, SHA1_DIGEST_LENGTH) == -1) {
609 		err = got_error_from_errno("imsg_add FETCH_REF");
610 		ibuf_free(wbuf);
611 		return err;
612 	}
613 	if (imsg_add(wbuf, refname, reflen) == -1) {
614 		err = got_error_from_errno("imsg_add FETCH_REF");
615 		ibuf_free(wbuf);
616 		return err;
617 	}
618 
619 	wbuf->fd = -1;
620 	imsg_close(ibuf, wbuf);
621 	return flush_imsg(ibuf);
622 }
623 
624 const struct got_error *
625 got_privsep_send_fetch_server_progress(struct imsgbuf *ibuf, const char *msg,
626     size_t msglen)
627 {
628 	if (msglen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
629 		return got_error(GOT_ERR_NO_SPACE);
630 
631 	if (msglen == 0)
632 		return NULL;
633 
634 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_SERVER_PROGRESS, 0, 0, -1,
635 	    msg, msglen) == -1)
636 		return got_error_from_errno(
637 		    "imsg_compose FETCH_SERVER_PROGRESS");
638 
639 	return flush_imsg(ibuf);
640 }
641 
642 const struct got_error *
643 got_privsep_send_fetch_download_progress(struct imsgbuf *ibuf, off_t bytes)
644 {
645 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DOWNLOAD_PROGRESS, 0, 0, -1,
646 	    &bytes, sizeof(bytes)) == -1)
647 		return got_error_from_errno(
648 		    "imsg_compose FETCH_DOWNLOAD_PROGRESS");
649 
650 	return flush_imsg(ibuf);
651 }
652 
653 const struct got_error *
654 got_privsep_send_fetch_done(struct imsgbuf *ibuf, struct got_object_id hash)
655 {
656 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DONE, 0, 0, -1,
657 	    hash.sha1, SHA1_DIGEST_LENGTH) == -1)
658 		return got_error_from_errno("imsg_compose FETCH");
659 	return flush_imsg(ibuf);
660 }
661 
662 
663 const struct got_error *
664 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
665     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
666     off_t *packfile_size, struct imsgbuf *ibuf)
667 {
668 	const struct got_error *err = NULL;
669 	struct imsg imsg;
670 	size_t datalen;
671 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
672 	size_t n, remain;
673 	off_t off;
674 	int i;
675 
676 	*done = 0;
677 	*id = NULL;
678 	*refname = NULL;
679 	*server_progress = NULL;
680 	*packfile_size = 0;
681 
682 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
683 	if (err)
684 		return err;
685 
686 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
687 	switch (imsg.hdr.type) {
688 	case GOT_IMSG_ERROR:
689 		if (datalen < sizeof(struct got_imsg_error)) {
690 			err = got_error(GOT_ERR_PRIVSEP_LEN);
691 			break;
692 		}
693 		err = recv_imsg_error(&imsg, datalen);
694 		break;
695 	case GOT_IMSG_FETCH_SYMREFS:
696 		if (datalen < sizeof(*isymrefs)) {
697 			err = got_error(GOT_ERR_PRIVSEP_LEN);
698 			break;
699 		}
700 		if (isymrefs != NULL) {
701 			err = got_error(GOT_ERR_PRIVSEP_MSG);
702 			break;
703 		}
704 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
705 		off = sizeof(*isymrefs);
706 		remain = datalen - off;
707 		for (n = 0; n < isymrefs->nsymrefs; n++) {
708 			struct got_imsg_fetch_symref *s;
709 			char *name, *target;
710 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
711 				err = got_error(GOT_ERR_PRIVSEP_LEN);
712 				goto done;
713 			}
714 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
715 			off += sizeof(*s);
716 			remain -= sizeof(*s);
717 			if (remain < s->name_len) {
718 				err = got_error(GOT_ERR_PRIVSEP_LEN);
719 				goto done;
720 			}
721 			name = strndup(imsg.data + off, s->name_len);
722 			if (name == NULL) {
723 				err = got_error_from_errno("strndup");
724 				goto done;
725 			}
726 			off += s->name_len;
727 			remain -= s->name_len;
728 			if (remain < s->target_len) {
729 				err = got_error(GOT_ERR_PRIVSEP_LEN);
730 				free(name);
731 				goto done;
732 			}
733 			target = strndup(imsg.data + off, s->target_len);
734 			if (target == NULL) {
735 				err = got_error_from_errno("strndup");
736 				free(name);
737 				goto done;
738 			}
739 			off += s->target_len;
740 			remain -= s->target_len;
741 			err = got_pathlist_append(symrefs, name, target);
742 			if (err) {
743 				free(name);
744 				free(target);
745 				goto done;
746 			}
747 		}
748 		break;
749 	case GOT_IMSG_FETCH_REF:
750 		if (datalen <= SHA1_DIGEST_LENGTH) {
751 			err = got_error(GOT_ERR_PRIVSEP_MSG);
752 			break;
753 		}
754 		*id = malloc(sizeof(**id));
755 		if (*id == NULL) {
756 			err = got_error_from_errno("malloc");
757 			break;
758 		}
759 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
760 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
761 		    datalen - SHA1_DIGEST_LENGTH);
762 		if (*refname == NULL) {
763 			err = got_error_from_errno("strndup");
764 			break;
765 		}
766 		break;
767 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
768 		if (datalen == 0) {
769 			err = got_error(GOT_ERR_PRIVSEP_LEN);
770 			break;
771 		}
772 		*server_progress = strndup(imsg.data, datalen);
773 		if (*server_progress == NULL) {
774 			err = got_error_from_errno("strndup");
775 			break;
776 		}
777 		for (i = 0; i < datalen; i++) {
778 			if (!isprint((unsigned char)(*server_progress)[i]) &&
779 			    !isspace((unsigned char)(*server_progress)[i])) {
780 				err = got_error(GOT_ERR_PRIVSEP_MSG);
781 				free(*server_progress);
782 				*server_progress = NULL;
783 				goto done;
784 			}
785 		}
786 		break;
787 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
788 		if (datalen < sizeof(*packfile_size)) {
789 			err = got_error(GOT_ERR_PRIVSEP_MSG);
790 			break;
791 		}
792 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
793 		break;
794 	case GOT_IMSG_FETCH_DONE:
795 		*id = malloc(sizeof(**id));
796 		if (*id == NULL) {
797 			err = got_error_from_errno("malloc");
798 			break;
799 		}
800 		if (datalen != SHA1_DIGEST_LENGTH) {
801 			err = got_error(GOT_ERR_PRIVSEP_MSG);
802 			break;
803 		}
804 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
805 		*done = 1;
806 		break;
807 	default:
808 		err = got_error(GOT_ERR_PRIVSEP_MSG);
809 		break;
810 	}
811 done:
812 	if (err) {
813 		free(*id);
814 		*id = NULL;
815 		free(*refname);
816 		*refname = NULL;
817 	}
818 	imsg_free(&imsg);
819 	return err;
820 }
821 
822 const struct got_error *
823 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_hash,
824     int fd)
825 {
826 	const struct got_error *err = NULL;
827 
828 	/* Keep in sync with struct got_imsg_index_pack_request */
829 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
830 	    pack_hash, SHA1_DIGEST_LENGTH) == -1) {
831 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
832 		close(fd);
833 		return err;
834 	}
835 	return flush_imsg(ibuf);
836 }
837 
838 const struct got_error *
839 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
840 {
841 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
842 }
843 
844 const struct got_error *
845 got_privsep_send_index_pack_progress(struct imsgbuf *ibuf, int nobj_total,
846     int nobj_indexed, int nobj_loose, int nobj_resolved)
847 {
848 	struct got_imsg_index_pack_progress iprogress;
849 
850 	iprogress.nobj_total = nobj_total;
851 	iprogress.nobj_indexed = nobj_indexed;
852 	iprogress.nobj_loose = nobj_loose;
853 	iprogress.nobj_resolved = nobj_resolved;
854 
855 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_PROGRESS, 0, 0, -1,
856 	    &iprogress, sizeof(iprogress)) == -1)
857 		return got_error_from_errno("imsg_compose IDXPACK_PROGRESS");
858 
859 	return flush_imsg(ibuf);
860 }
861 
862 const struct got_error *
863 got_privsep_send_index_pack_done(struct imsgbuf *ibuf)
864 {
865 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_DONE, 0, 0, -1, NULL, 0) == -1)
866 		return got_error_from_errno("imsg_compose FETCH");
867 	return flush_imsg(ibuf);
868 }
869 
870 const struct got_error *
871 got_privsep_recv_index_progress(int *done, int *nobj_total,
872     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
873     struct imsgbuf *ibuf)
874 {
875 	const struct got_error *err = NULL;
876 	struct imsg imsg;
877 	struct got_imsg_index_pack_progress *iprogress;
878 	size_t datalen;
879 
880 	*done = 0;
881 	*nobj_total = 0;
882 	*nobj_indexed = 0;
883 	*nobj_resolved = 0;
884 
885 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
886 	if (err)
887 		return err;
888 
889 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
890 	switch (imsg.hdr.type) {
891 	case GOT_IMSG_ERROR:
892 		if (datalen < sizeof(struct got_imsg_error)) {
893 			err = got_error(GOT_ERR_PRIVSEP_LEN);
894 			break;
895 		}
896 		err = recv_imsg_error(&imsg, datalen);
897 		break;
898 	case GOT_IMSG_IDXPACK_PROGRESS:
899 		if (datalen < sizeof(*iprogress)) {
900 			err = got_error(GOT_ERR_PRIVSEP_LEN);
901 			break;
902 		}
903 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
904 		*nobj_total = iprogress->nobj_total;
905 		*nobj_indexed = iprogress->nobj_indexed;
906 		*nobj_loose = iprogress->nobj_loose;
907 		*nobj_resolved = iprogress->nobj_resolved;
908 		break;
909 	case GOT_IMSG_IDXPACK_DONE:
910 		if (datalen != 0) {
911 			err = got_error(GOT_ERR_PRIVSEP_LEN);
912 			break;
913 		}
914 		*done = 1;
915 		break;
916 	default:
917 		err = got_error(GOT_ERR_PRIVSEP_MSG);
918 		break;
919 	}
920 
921 	imsg_free(&imsg);
922 	return err;
923 }
924 
925 const struct got_error *
926 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
927     struct imsgbuf *ibuf)
928 {
929 	const struct got_error *err = NULL;
930 	struct got_imsg_object *iobj;
931 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
932 
933 	if (datalen != sizeof(*iobj))
934 		return got_error(GOT_ERR_PRIVSEP_LEN);
935 	iobj = imsg->data;
936 
937 	*obj = calloc(1, sizeof(**obj));
938 	if (*obj == NULL)
939 		return got_error_from_errno("calloc");
940 
941 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
942 	(*obj)->type = iobj->type;
943 	(*obj)->flags = iobj->flags;
944 	(*obj)->hdrlen = iobj->hdrlen;
945 	(*obj)->size = iobj->size;
946 	/* path_packfile is handled by caller */
947 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
948 		(*obj)->pack_offset = iobj->pack_offset;
949 		(*obj)->pack_idx = iobj->pack_idx;
950 	}
951 
952 	return err;
953 }
954 
955 const struct got_error *
956 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
957 {
958 	const struct got_error *err = NULL;
959 	struct imsg imsg;
960 	const size_t min_datalen =
961 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
962 
963 	*obj = NULL;
964 
965 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
966 	if (err)
967 		return err;
968 
969 	switch (imsg.hdr.type) {
970 	case GOT_IMSG_OBJECT:
971 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
972 		break;
973 	default:
974 		err = got_error(GOT_ERR_PRIVSEP_MSG);
975 		break;
976 	}
977 
978 	imsg_free(&imsg);
979 
980 	return err;
981 }
982 
983 static const struct got_error *
984 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
985     size_t logmsg_len)
986 {
987 	const struct got_error *err = NULL;
988 	size_t offset, remain;
989 
990 	offset = 0;
991 	remain = logmsg_len;
992 	while (remain > 0) {
993 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
994 
995 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
996 		    commit->logmsg + offset, n) == -1) {
997 			err = got_error_from_errno("imsg_compose "
998 			    "COMMIT_LOGMSG");
999 			break;
1000 		}
1001 
1002 		err = flush_imsg(ibuf);
1003 		if (err)
1004 			break;
1005 
1006 		offset += n;
1007 		remain -= n;
1008 	}
1009 
1010 	return err;
1011 }
1012 
1013 const struct got_error *
1014 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1015 {
1016 	const struct got_error *err = NULL;
1017 	struct got_imsg_commit_object *icommit;
1018 	uint8_t *buf;
1019 	size_t len, total;
1020 	struct got_object_qid *qid;
1021 	size_t author_len = strlen(commit->author);
1022 	size_t committer_len = strlen(commit->committer);
1023 	size_t logmsg_len = strlen(commit->logmsg);
1024 
1025 	total = sizeof(*icommit) + author_len + committer_len +
1026 	    commit->nparents * SHA1_DIGEST_LENGTH;
1027 
1028 	buf = malloc(total);
1029 	if (buf == NULL)
1030 		return got_error_from_errno("malloc");
1031 
1032 	icommit = (struct got_imsg_commit_object *)buf;
1033 	memcpy(icommit->tree_id, commit->tree_id->sha1,
1034 	    sizeof(icommit->tree_id));
1035 	icommit->author_len = author_len;
1036 	icommit->author_time = commit->author_time;
1037 	icommit->author_gmtoff = commit->author_gmtoff;
1038 	icommit->committer_len = committer_len;
1039 	icommit->committer_time = commit->committer_time;
1040 	icommit->committer_gmtoff = commit->committer_gmtoff;
1041 	icommit->logmsg_len = logmsg_len;
1042 	icommit->nparents = commit->nparents;
1043 
1044 	len = sizeof(*icommit);
1045 	memcpy(buf + len, commit->author, author_len);
1046 	len += author_len;
1047 	memcpy(buf + len, commit->committer, committer_len);
1048 	len += committer_len;
1049 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
1050 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
1051 		len += SHA1_DIGEST_LENGTH;
1052 	}
1053 
1054 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1055 		err = got_error_from_errno("imsg_compose COMMIT");
1056 		goto done;
1057 	}
1058 
1059 	if (logmsg_len == 0 ||
1060 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1061 		err = flush_imsg(ibuf);
1062 		if (err)
1063 			goto done;
1064 	}
1065 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1066 done:
1067 	free(buf);
1068 	return err;
1069 }
1070 
1071 static const struct got_error *
1072 get_commit_from_imsg(struct got_commit_object **commit,
1073     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1074 {
1075 	const struct got_error *err = NULL;
1076 	struct got_imsg_commit_object *icommit;
1077 	size_t len = 0;
1078 	int i;
1079 
1080 	if (datalen < sizeof(*icommit))
1081 		return got_error(GOT_ERR_PRIVSEP_LEN);
1082 
1083 	icommit = imsg->data;
1084 	if (datalen != sizeof(*icommit) + icommit->author_len +
1085 	    icommit->committer_len +
1086 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1087 		return got_error(GOT_ERR_PRIVSEP_LEN);
1088 
1089 	if (icommit->nparents < 0)
1090 		return got_error(GOT_ERR_PRIVSEP_LEN);
1091 
1092 	len += sizeof(*icommit);
1093 
1094 	*commit = got_object_commit_alloc_partial();
1095 	if (*commit == NULL)
1096 		return got_error_from_errno(
1097 		    "got_object_commit_alloc_partial");
1098 
1099 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1100 	    SHA1_DIGEST_LENGTH);
1101 	(*commit)->author_time = icommit->author_time;
1102 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1103 	(*commit)->committer_time = icommit->committer_time;
1104 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1105 
1106 	if (icommit->author_len == 0) {
1107 		(*commit)->author = strdup("");
1108 		if ((*commit)->author == NULL) {
1109 			err = got_error_from_errno("strdup");
1110 			goto done;
1111 		}
1112 	} else {
1113 		(*commit)->author = malloc(icommit->author_len + 1);
1114 		if ((*commit)->author == NULL) {
1115 			err = got_error_from_errno("malloc");
1116 			goto done;
1117 		}
1118 		memcpy((*commit)->author, imsg->data + len,
1119 		    icommit->author_len);
1120 		(*commit)->author[icommit->author_len] = '\0';
1121 	}
1122 	len += icommit->author_len;
1123 
1124 	if (icommit->committer_len == 0) {
1125 		(*commit)->committer = strdup("");
1126 		if ((*commit)->committer == NULL) {
1127 			err = got_error_from_errno("strdup");
1128 			goto done;
1129 		}
1130 	} else {
1131 		(*commit)->committer =
1132 		    malloc(icommit->committer_len + 1);
1133 		if ((*commit)->committer == NULL) {
1134 			err = got_error_from_errno("malloc");
1135 			goto done;
1136 		}
1137 		memcpy((*commit)->committer, imsg->data + len,
1138 		    icommit->committer_len);
1139 		(*commit)->committer[icommit->committer_len] = '\0';
1140 	}
1141 	len += icommit->committer_len;
1142 
1143 	if (icommit->logmsg_len == 0) {
1144 		(*commit)->logmsg = strdup("");
1145 		if ((*commit)->logmsg == NULL) {
1146 			err = got_error_from_errno("strdup");
1147 			goto done;
1148 		}
1149 	} else {
1150 		size_t offset = 0, remain = icommit->logmsg_len;
1151 
1152 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1153 		if ((*commit)->logmsg == NULL) {
1154 			err = got_error_from_errno("malloc");
1155 			goto done;
1156 		}
1157 		while (remain > 0) {
1158 			struct imsg imsg_log;
1159 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1160 			    remain);
1161 
1162 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1163 			if (err)
1164 				goto done;
1165 
1166 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1167 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1168 				goto done;
1169 			}
1170 
1171 			memcpy((*commit)->logmsg + offset,
1172 			    imsg_log.data, n);
1173 			imsg_free(&imsg_log);
1174 			offset += n;
1175 			remain -= n;
1176 		}
1177 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1178 	}
1179 
1180 	for (i = 0; i < icommit->nparents; i++) {
1181 		struct got_object_qid *qid;
1182 
1183 		err = got_object_qid_alloc_partial(&qid);
1184 		if (err)
1185 			break;
1186 		memcpy(qid->id, imsg->data + len +
1187 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
1188 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1189 		(*commit)->nparents++;
1190 	}
1191 done:
1192 	if (err) {
1193 		got_object_commit_close(*commit);
1194 		*commit = NULL;
1195 	}
1196 	return err;
1197 }
1198 
1199 const struct got_error *
1200 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1201 {
1202 	const struct got_error *err = NULL;
1203 	struct imsg imsg;
1204 	size_t datalen;
1205 	const size_t min_datalen =
1206 	    MIN(sizeof(struct got_imsg_error),
1207 	    sizeof(struct got_imsg_commit_object));
1208 
1209 	*commit = NULL;
1210 
1211 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1212 	if (err)
1213 		return err;
1214 
1215 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1216 
1217 	switch (imsg.hdr.type) {
1218 	case GOT_IMSG_COMMIT:
1219 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1220 		break;
1221 	default:
1222 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1223 		break;
1224 	}
1225 
1226 	imsg_free(&imsg);
1227 
1228 	return err;
1229 }
1230 
1231 const struct got_error *
1232 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
1233     int nentries)
1234 {
1235 	const struct got_error *err = NULL;
1236 	struct got_imsg_tree_object itree;
1237 	struct got_pathlist_entry *pe;
1238 	size_t totlen;
1239 	int nimsg; /* number of imsg queued in ibuf */
1240 
1241 	itree.nentries = nentries;
1242 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1243 	    == -1)
1244 		return got_error_from_errno("imsg_compose TREE");
1245 
1246 	totlen = sizeof(itree);
1247 	nimsg = 1;
1248 	TAILQ_FOREACH(pe, entries, entry) {
1249 		const char *name = pe->path;
1250 		struct got_parsed_tree_entry *pte = pe->data;
1251 		struct ibuf *wbuf;
1252 		size_t namelen = strlen(name);
1253 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
1254 
1255 		if (len > MAX_IMSGSIZE)
1256 			return got_error(GOT_ERR_NO_SPACE);
1257 
1258 		nimsg++;
1259 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
1260 			err = flush_imsg(ibuf);
1261 			if (err)
1262 				return err;
1263 			nimsg = 0;
1264 		}
1265 
1266 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
1267 		if (wbuf == NULL)
1268 			return got_error_from_errno("imsg_create TREE_ENTRY");
1269 
1270 		/* Keep in sync with struct got_imsg_tree_object definition! */
1271 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
1272 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1273 			ibuf_free(wbuf);
1274 			return err;
1275 		}
1276 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
1277 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1278 			ibuf_free(wbuf);
1279 			return err;
1280 		}
1281 
1282 		if (imsg_add(wbuf, name, namelen) == -1) {
1283 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1284 			ibuf_free(wbuf);
1285 			return err;
1286 		}
1287 
1288 		wbuf->fd = -1;
1289 		imsg_close(ibuf, wbuf);
1290 
1291 		totlen += len;
1292 	}
1293 
1294 	return flush_imsg(ibuf);
1295 }
1296 
1297 const struct got_error *
1298 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1299 {
1300 	const struct got_error *err = NULL;
1301 	const size_t min_datalen =
1302 	    MIN(sizeof(struct got_imsg_error),
1303 	    sizeof(struct got_imsg_tree_object));
1304 	struct got_imsg_tree_object *itree;
1305 	int nentries = 0;
1306 
1307 	*tree = NULL;
1308 get_more:
1309 	err = read_imsg(ibuf);
1310 	if (err)
1311 		goto done;
1312 
1313 	for (;;) {
1314 		struct imsg imsg;
1315 		size_t n;
1316 		size_t datalen;
1317 		struct got_imsg_tree_entry *ite;
1318 		struct got_tree_entry *te = NULL;
1319 
1320 		n = imsg_get(ibuf, &imsg);
1321 		if (n == 0) {
1322 			if (*tree && (*tree)->nentries != nentries)
1323 				goto get_more;
1324 			break;
1325 		}
1326 
1327 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
1328 			return got_error(GOT_ERR_PRIVSEP_LEN);
1329 
1330 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1331 
1332 		switch (imsg.hdr.type) {
1333 		case GOT_IMSG_ERROR:
1334 			err = recv_imsg_error(&imsg, datalen);
1335 			break;
1336 		case GOT_IMSG_TREE:
1337 			/* This message should only appear once. */
1338 			if (*tree != NULL) {
1339 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1340 				break;
1341 			}
1342 			if (datalen != sizeof(*itree)) {
1343 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1344 				break;
1345 			}
1346 			itree = imsg.data;
1347 			*tree = malloc(sizeof(**tree));
1348 			if (*tree == NULL) {
1349 				err = got_error_from_errno("malloc");
1350 				break;
1351 			}
1352 			(*tree)->entries = calloc(itree->nentries,
1353 			    sizeof(struct got_tree_entry));
1354 			if ((*tree)->entries == NULL) {
1355 				err = got_error_from_errno("malloc");
1356 				break;
1357 			}
1358 			(*tree)->nentries = itree->nentries;
1359 			(*tree)->refcnt = 0;
1360 			break;
1361 		case GOT_IMSG_TREE_ENTRY:
1362 			/* This message should be preceeded by GOT_IMSG_TREE. */
1363 			if (*tree == NULL) {
1364 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1365 				break;
1366 			}
1367 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
1368 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1369 				break;
1370 			}
1371 
1372 			/* Remaining data contains the entry's name. */
1373 			datalen -= sizeof(*ite);
1374 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
1375 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1376 				break;
1377 			}
1378 			ite = imsg.data;
1379 
1380 			if (datalen + 1 > sizeof(te->name)) {
1381 				err = got_error(GOT_ERR_NO_SPACE);
1382 				break;
1383 			}
1384 			te = &(*tree)->entries[nentries];
1385 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
1386 			te->name[datalen] = '\0';
1387 
1388 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
1389 			te->mode = ite->mode;
1390 			te->idx = nentries;
1391 			nentries++;
1392 			break;
1393 		default:
1394 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1395 			break;
1396 		}
1397 
1398 		imsg_free(&imsg);
1399 	}
1400 done:
1401 	if (*tree && (*tree)->nentries != nentries) {
1402 		if (err == NULL)
1403 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1404 		got_object_tree_close(*tree);
1405 		*tree = NULL;
1406 	}
1407 
1408 	return err;
1409 }
1410 
1411 const struct got_error *
1412 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1413     const uint8_t *data)
1414 {
1415 	struct got_imsg_blob iblob;
1416 
1417 	iblob.size = size;
1418 	iblob.hdrlen = hdrlen;
1419 
1420 	if (data) {
1421 		uint8_t *buf;
1422 
1423 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1424 			return got_error(GOT_ERR_NO_SPACE);
1425 
1426 		buf = malloc(sizeof(iblob) + size);
1427 		if (buf == NULL)
1428 			return got_error_from_errno("malloc");
1429 
1430 		memcpy(buf, &iblob, sizeof(iblob));
1431 		memcpy(buf + sizeof(iblob), data, size);
1432 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1433 		   sizeof(iblob) + size) == -1) {
1434 			free(buf);
1435 			return got_error_from_errno("imsg_compose BLOB");
1436 		}
1437 		free(buf);
1438 	} else {
1439 		/* Data has already been written to file descriptor. */
1440 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1441 		    sizeof(iblob)) == -1)
1442 			return got_error_from_errno("imsg_compose BLOB");
1443 	}
1444 
1445 
1446 	return flush_imsg(ibuf);
1447 }
1448 
1449 const struct got_error *
1450 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1451     struct imsgbuf *ibuf)
1452 {
1453 	const struct got_error *err = NULL;
1454 	struct imsg imsg;
1455 	struct got_imsg_blob *iblob;
1456 	size_t datalen;
1457 
1458 	*outbuf = NULL;
1459 
1460 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1461 	if (err)
1462 		return err;
1463 
1464 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1465 
1466 	switch (imsg.hdr.type) {
1467 	case GOT_IMSG_BLOB:
1468 		if (datalen < sizeof(*iblob)) {
1469 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1470 			break;
1471 		}
1472 		iblob = imsg.data;
1473 		*size = iblob->size;
1474 		*hdrlen = iblob->hdrlen;
1475 
1476 		if (datalen == sizeof(*iblob)) {
1477 			/* Data has been written to file descriptor. */
1478 			break;
1479 		}
1480 
1481 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1482 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1483 			break;
1484 		}
1485 
1486 		*outbuf = malloc(*size);
1487 		if (*outbuf == NULL) {
1488 			err = got_error_from_errno("malloc");
1489 			break;
1490 		}
1491 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1492 		break;
1493 	default:
1494 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1495 		break;
1496 	}
1497 
1498 	imsg_free(&imsg);
1499 
1500 	return err;
1501 }
1502 
1503 static const struct got_error *
1504 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1505 {
1506 	const struct got_error *err = NULL;
1507 	size_t offset, remain;
1508 
1509 	offset = 0;
1510 	remain = tagmsg_len;
1511 	while (remain > 0) {
1512 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1513 
1514 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1515 		    tag->tagmsg + offset, n) == -1) {
1516 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1517 			break;
1518 		}
1519 
1520 		err = flush_imsg(ibuf);
1521 		if (err)
1522 			break;
1523 
1524 		offset += n;
1525 		remain -= n;
1526 	}
1527 
1528 	return err;
1529 }
1530 
1531 const struct got_error *
1532 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1533 {
1534 	const struct got_error *err = NULL;
1535 	struct got_imsg_tag_object *itag;
1536 	uint8_t *buf;
1537 	size_t len, total;
1538 	size_t tag_len = strlen(tag->tag);
1539 	size_t tagger_len = strlen(tag->tagger);
1540 	size_t tagmsg_len = strlen(tag->tagmsg);
1541 
1542 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1543 
1544 	buf = malloc(total);
1545 	if (buf == NULL)
1546 		return got_error_from_errno("malloc");
1547 
1548 	itag = (struct got_imsg_tag_object *)buf;
1549 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1550 	itag->obj_type = tag->obj_type;
1551 	itag->tag_len = tag_len;
1552 	itag->tagger_len = tagger_len;
1553 	itag->tagger_time = tag->tagger_time;
1554 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1555 	itag->tagmsg_len = tagmsg_len;
1556 
1557 	len = sizeof(*itag);
1558 	memcpy(buf + len, tag->tag, tag_len);
1559 	len += tag_len;
1560 	memcpy(buf + len, tag->tagger, tagger_len);
1561 	len += tagger_len;
1562 
1563 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1564 		err = got_error_from_errno("imsg_compose TAG");
1565 		goto done;
1566 	}
1567 
1568 	if (tagmsg_len == 0 ||
1569 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1570 		err = flush_imsg(ibuf);
1571 		if (err)
1572 			goto done;
1573 	}
1574 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1575 done:
1576 	free(buf);
1577 	return err;
1578 }
1579 
1580 const struct got_error *
1581 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1582 {
1583 	const struct got_error *err = NULL;
1584 	struct imsg imsg;
1585 	struct got_imsg_tag_object *itag;
1586 	size_t len, datalen;
1587 	const size_t min_datalen =
1588 	    MIN(sizeof(struct got_imsg_error),
1589 	    sizeof(struct got_imsg_tag_object));
1590 
1591 	*tag = NULL;
1592 
1593 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1594 	if (err)
1595 		return err;
1596 
1597 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1598 	len = 0;
1599 
1600 	switch (imsg.hdr.type) {
1601 	case GOT_IMSG_TAG:
1602 		if (datalen < sizeof(*itag)) {
1603 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1604 			break;
1605 		}
1606 		itag = imsg.data;
1607 		if (datalen != sizeof(*itag) + itag->tag_len +
1608 		    itag->tagger_len) {
1609 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1610 			break;
1611 		}
1612 		len += sizeof(*itag);
1613 
1614 		*tag = calloc(1, sizeof(**tag));
1615 		if (*tag == NULL) {
1616 			err = got_error_from_errno("calloc");
1617 			break;
1618 		}
1619 
1620 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1621 
1622 		if (itag->tag_len == 0) {
1623 			(*tag)->tag = strdup("");
1624 			if ((*tag)->tag == NULL) {
1625 				err = got_error_from_errno("strdup");
1626 				break;
1627 			}
1628 		} else {
1629 			(*tag)->tag = malloc(itag->tag_len + 1);
1630 			if ((*tag)->tag == NULL) {
1631 				err = got_error_from_errno("malloc");
1632 				break;
1633 			}
1634 			memcpy((*tag)->tag, imsg.data + len,
1635 			    itag->tag_len);
1636 			(*tag)->tag[itag->tag_len] = '\0';
1637 		}
1638 		len += itag->tag_len;
1639 
1640 		(*tag)->obj_type = itag->obj_type;
1641 		(*tag)->tagger_time = itag->tagger_time;
1642 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1643 
1644 		if (itag->tagger_len == 0) {
1645 			(*tag)->tagger = strdup("");
1646 			if ((*tag)->tagger == NULL) {
1647 				err = got_error_from_errno("strdup");
1648 				break;
1649 			}
1650 		} else {
1651 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1652 			if ((*tag)->tagger == NULL) {
1653 				err = got_error_from_errno("malloc");
1654 				break;
1655 			}
1656 			memcpy((*tag)->tagger, imsg.data + len,
1657 			    itag->tagger_len);
1658 			(*tag)->tagger[itag->tagger_len] = '\0';
1659 		}
1660 		len += itag->tagger_len;
1661 
1662 		if (itag->tagmsg_len == 0) {
1663 			(*tag)->tagmsg = strdup("");
1664 			if ((*tag)->tagmsg == NULL) {
1665 				err = got_error_from_errno("strdup");
1666 				break;
1667 			}
1668 		} else {
1669 			size_t offset = 0, remain = itag->tagmsg_len;
1670 
1671 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1672 			if ((*tag)->tagmsg == NULL) {
1673 				err = got_error_from_errno("malloc");
1674 				break;
1675 			}
1676 			while (remain > 0) {
1677 				struct imsg imsg_log;
1678 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1679 				    remain);
1680 
1681 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1682 				if (err)
1683 					return err;
1684 
1685 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1686 					return got_error(GOT_ERR_PRIVSEP_MSG);
1687 
1688 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1689 				    n);
1690 				imsg_free(&imsg_log);
1691 				offset += n;
1692 				remain -= n;
1693 			}
1694 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1695 		}
1696 
1697 		break;
1698 	default:
1699 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1700 		break;
1701 	}
1702 
1703 	imsg_free(&imsg);
1704 
1705 	return err;
1706 }
1707 
1708 const struct got_error *
1709 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1710     struct got_packidx *packidx)
1711 {
1712 	const struct got_error *err = NULL;
1713 	struct got_imsg_packidx ipackidx;
1714 	struct got_imsg_pack ipack;
1715 	int fd;
1716 
1717 	ipackidx.len = packidx->len;
1718 	fd = dup(packidx->fd);
1719 	if (fd == -1)
1720 		return got_error_from_errno("dup");
1721 
1722 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1723 	    sizeof(ipackidx)) == -1) {
1724 		err = got_error_from_errno("imsg_compose PACKIDX");
1725 		close(fd);
1726 		return err;
1727 	}
1728 
1729 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1730 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1731 		return got_error(GOT_ERR_NO_SPACE);
1732 	ipack.filesize = pack->filesize;
1733 
1734 	fd = dup(pack->fd);
1735 	if (fd == -1)
1736 		return got_error_from_errno("dup");
1737 
1738 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1739 	    == -1) {
1740 		err = got_error_from_errno("imsg_compose PACK");
1741 		close(fd);
1742 		return err;
1743 	}
1744 
1745 	return flush_imsg(ibuf);
1746 }
1747 
1748 const struct got_error *
1749 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1750     struct got_object_id *id)
1751 {
1752 	struct got_imsg_packed_object iobj;
1753 
1754 	iobj.idx = idx;
1755 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1756 
1757 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1758 	    &iobj, sizeof(iobj)) == -1)
1759 		return got_error_from_errno("imsg_compose "
1760 		    "PACKED_OBJECT_REQUEST");
1761 
1762 	return flush_imsg(ibuf);
1763 }
1764 
1765 const struct got_error *
1766 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1767 {
1768 	const struct got_error *err = NULL;
1769 
1770 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1771 	    NULL, 0) == -1) {
1772 		err = got_error_from_errno("imsg_compose "
1773 		    "GITCONFIG_PARSE_REQUEST");
1774 		close(fd);
1775 		return err;
1776 	}
1777 
1778 	return flush_imsg(ibuf);
1779 }
1780 
1781 const struct got_error *
1782 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1783 {
1784 	if (imsg_compose(ibuf,
1785 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1786 	    NULL, 0) == -1)
1787 		return got_error_from_errno("imsg_compose "
1788 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1789 
1790 	return flush_imsg(ibuf);
1791 }
1792 
1793 const struct got_error *
1794 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1795 {
1796 	if (imsg_compose(ibuf,
1797 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1798 		return got_error_from_errno("imsg_compose "
1799 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1800 
1801 	return flush_imsg(ibuf);
1802 }
1803 
1804 const struct got_error *
1805 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1806 {
1807 	if (imsg_compose(ibuf,
1808 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1809 		return got_error_from_errno("imsg_compose "
1810 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1811 
1812 	return flush_imsg(ibuf);
1813 }
1814 
1815 const struct got_error *
1816 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1817 {
1818 	if (imsg_compose(ibuf,
1819 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1820 		return got_error_from_errno("imsg_compose "
1821 		    "GITCONFIG_REMOTE_REQUEST");
1822 
1823 	return flush_imsg(ibuf);
1824 }
1825 
1826 const struct got_error *
1827 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
1828 {
1829 	if (imsg_compose(ibuf,
1830 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
1831 		return got_error_from_errno("imsg_compose "
1832 		    "GITCONFIG_OWNER_REQUEST");
1833 
1834 	return flush_imsg(ibuf);
1835 }
1836 
1837 const struct got_error *
1838 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1839 {
1840 	size_t len = value ? strlen(value) + 1 : 0;
1841 
1842 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1843 	    value, len) == -1)
1844 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1845 
1846 	return flush_imsg(ibuf);
1847 }
1848 
1849 const struct got_error *
1850 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1851 {
1852 	const struct got_error *err = NULL;
1853 	struct imsg imsg;
1854 	size_t datalen;
1855 	const size_t min_datalen = 0;
1856 
1857 	*str = NULL;
1858 
1859 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1860 	if (err)
1861 		return err;
1862 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1863 
1864 	switch (imsg.hdr.type) {
1865 	case GOT_IMSG_GITCONFIG_STR_VAL:
1866 		if (datalen == 0)
1867 			break;
1868 		*str = malloc(datalen);
1869 		if (*str == NULL) {
1870 			err = got_error_from_errno("malloc");
1871 			break;
1872 		}
1873 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1874 			err = got_error(GOT_ERR_NO_SPACE);
1875 		break;
1876 	default:
1877 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1878 		break;
1879 	}
1880 
1881 	imsg_free(&imsg);
1882 	return err;
1883 }
1884 
1885 const struct got_error *
1886 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1887 {
1888 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1889 	    &value, sizeof(value)) == -1)
1890 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1891 
1892 	return flush_imsg(ibuf);
1893 }
1894 
1895 const struct got_error *
1896 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1897 {
1898 	const struct got_error *err = NULL;
1899 	struct imsg imsg;
1900 	size_t datalen;
1901 	const size_t min_datalen =
1902 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1903 
1904 	*val = 0;
1905 
1906 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1907 	if (err)
1908 		return err;
1909 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1910 
1911 	switch (imsg.hdr.type) {
1912 	case GOT_IMSG_GITCONFIG_INT_VAL:
1913 		if (datalen != sizeof(*val)) {
1914 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1915 			break;
1916 		}
1917 		memcpy(val, imsg.data, sizeof(*val));
1918 		break;
1919 	default:
1920 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1921 		break;
1922 	}
1923 
1924 	imsg_free(&imsg);
1925 	return err;
1926 }
1927 
1928 const struct got_error *
1929 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1930     struct got_remote_repo *remotes, int nremotes)
1931 {
1932 	const struct got_error *err = NULL;
1933 	struct got_imsg_remotes iremotes;
1934 	int i;
1935 
1936 	iremotes.nremotes = nremotes;
1937 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1938 	    &iremotes, sizeof(iremotes)) == -1)
1939 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1940 
1941 	err = flush_imsg(ibuf);
1942 	imsg_clear(ibuf);
1943 	if (err)
1944 		return err;
1945 
1946 	for (i = 0; i < nremotes; i++) {
1947 		struct got_imsg_remote iremote;
1948 		size_t len = sizeof(iremote);
1949 		struct ibuf *wbuf;
1950 
1951 		iremote.mirror_references = remotes[i].mirror_references;
1952 		iremote.name_len = strlen(remotes[i].name);
1953 		len += iremote.name_len;
1954 		iremote.url_len = strlen(remotes[i].url);
1955 		len += iremote.url_len;
1956 
1957 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1958 		if (wbuf == NULL)
1959 			return got_error_from_errno(
1960 			    "imsg_create GITCONFIG_REMOTE");
1961 
1962 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1963 			err = got_error_from_errno(
1964 			    "imsg_add GITCONFIG_REMOTE");
1965 			ibuf_free(wbuf);
1966 			return err;
1967 		}
1968 
1969 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1970 			err = got_error_from_errno(
1971 			    "imsg_add GITCONFIG_REMOTE");
1972 			ibuf_free(wbuf);
1973 			return err;
1974 		}
1975 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1976 			err = got_error_from_errno(
1977 			    "imsg_add GITCONFIG_REMOTE");
1978 			ibuf_free(wbuf);
1979 			return err;
1980 		}
1981 
1982 		wbuf->fd = -1;
1983 		imsg_close(ibuf, wbuf);
1984 		err = flush_imsg(ibuf);
1985 		if (err)
1986 			return err;
1987 	}
1988 
1989 	return NULL;
1990 }
1991 
1992 const struct got_error *
1993 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1994     int *nremotes, struct imsgbuf *ibuf)
1995 {
1996 	const struct got_error *err = NULL;
1997 	struct imsg imsg;
1998 	size_t datalen;
1999 	struct got_imsg_remotes iremotes;
2000 	struct got_imsg_remote iremote;
2001 
2002 	*remotes = NULL;
2003 	*nremotes = 0;
2004 	iremotes.nremotes = 0;
2005 
2006 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2007 	if (err)
2008 		return err;
2009 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2010 
2011 	switch (imsg.hdr.type) {
2012 	case GOT_IMSG_GITCONFIG_REMOTES:
2013 		if (datalen != sizeof(iremotes)) {
2014 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2015 			break;
2016 		}
2017 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2018 		if (iremotes.nremotes == 0) {
2019 			imsg_free(&imsg);
2020 			return NULL;
2021 		}
2022 		break;
2023 	default:
2024 		imsg_free(&imsg);
2025 		return got_error(GOT_ERR_PRIVSEP_MSG);
2026 	}
2027 
2028 	imsg_free(&imsg);
2029 
2030 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2031 	if (*remotes == NULL)
2032 		return got_error_from_errno("recallocarray");
2033 
2034 	while (*nremotes < iremotes.nremotes) {
2035 		struct got_remote_repo *remote;
2036 	
2037 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2038 		if (err)
2039 			break;
2040 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2041 
2042 		switch (imsg.hdr.type) {
2043 		case GOT_IMSG_GITCONFIG_REMOTE:
2044 			remote = &(*remotes)[*nremotes];
2045 			if (datalen < sizeof(iremote)) {
2046 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2047 				break;
2048 			}
2049 			memcpy(&iremote, imsg.data, sizeof(iremote));
2050 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
2051 			    (sizeof(iremote) + iremote.name_len +
2052 			    iremote.url_len) > datalen) {
2053 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2054 				break;
2055 			}
2056 			remote->name = strndup(imsg.data + sizeof(iremote),
2057 			    iremote.name_len);
2058 			if (remote->name == NULL) {
2059 				err = got_error_from_errno("strndup");
2060 				break;
2061 			}
2062 			remote->url = strndup(imsg.data + sizeof(iremote) +
2063 			    iremote.name_len, iremote.url_len);
2064 			if (remote->url == NULL) {
2065 				err = got_error_from_errno("strndup");
2066 				free(remote->name);
2067 				break;
2068 			}
2069 			remote->mirror_references = iremote.mirror_references;
2070 			(*nremotes)++;
2071 			break;
2072 		default:
2073 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2074 			break;
2075 		}
2076 
2077 		imsg_free(&imsg);
2078 		if (err)
2079 			break;
2080 	}
2081 
2082 	if (err) {
2083 		int i;
2084 		for (i = 0; i < *nremotes; i++) {
2085 			free((*remotes)[i].name);
2086 			free((*remotes)[i].url);
2087 		}
2088 		free(*remotes);
2089 		*remotes = NULL;
2090 		*nremotes = 0;
2091 	}
2092 	return err;
2093 }
2094 
2095 const struct got_error *
2096 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2097      struct got_object_id *id, int idx, const char *path)
2098 {
2099 	const struct got_error *err = NULL;
2100 	struct ibuf *wbuf;
2101 	size_t path_len = strlen(path) + 1;
2102 
2103 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2104 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2105 	if (wbuf == NULL)
2106 		return got_error_from_errno(
2107 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2108 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2109 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2110 		ibuf_free(wbuf);
2111 		return err;
2112 	}
2113 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
2114 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2115 		ibuf_free(wbuf);
2116 		return err;
2117 	}
2118 	if (imsg_add(wbuf, path, path_len) == -1) {
2119 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2120 		ibuf_free(wbuf);
2121 		return err;
2122 	}
2123 
2124 	wbuf->fd = -1;
2125 	imsg_close(ibuf, wbuf);
2126 
2127 	return flush_imsg(ibuf);
2128 }
2129 
2130 const struct got_error *
2131 got_privsep_send_traversed_commits(struct got_object_id *commit_ids, 
2132     size_t ncommits, struct imsgbuf *ibuf)
2133 {
2134 	const struct got_error *err;
2135 	struct ibuf *wbuf;
2136 	int i;
2137 
2138 	wbuf = imsg_create(ibuf, GOT_IMSG_TRAVERSED_COMMITS, 0, 0,
2139 	    sizeof(struct got_imsg_traversed_commits) +
2140 	    ncommits * SHA1_DIGEST_LENGTH);
2141 	if (wbuf == NULL)
2142 		return got_error_from_errno("imsg_create TRAVERSED_COMMITS");
2143 
2144 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1) {
2145 		err = got_error_from_errno("imsg_add TRAVERSED_COMMITS");
2146 		ibuf_free(wbuf);
2147 		return err;
2148 	}
2149 	for (i = 0; i < ncommits; i++) {
2150 		struct got_object_id *id = &commit_ids[i];
2151 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2152 			err = got_error_from_errno(
2153 			    "imsg_add TRAVERSED_COMMITS");
2154 			ibuf_free(wbuf);
2155 			return err;
2156 		}
2157 	}
2158 
2159 	wbuf->fd = -1;
2160 	imsg_close(ibuf, wbuf);
2161 
2162 	return flush_imsg(ibuf);
2163 }
2164 
2165 const struct got_error *
2166 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2167     struct got_object_id **changed_commit_id,
2168     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2169 {
2170 	const struct got_error *err = NULL;
2171 	struct imsg imsg;
2172 	struct got_imsg_traversed_commits *icommits;
2173 	size_t datalen;
2174 	int i, done = 0;
2175 
2176 	*changed_commit = NULL;
2177 	*changed_commit_id = NULL;
2178 
2179 	while (!done) {
2180 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2181 		if (err)
2182 			return err;
2183 
2184 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2185 		switch (imsg.hdr.type) {
2186 		case GOT_IMSG_TRAVERSED_COMMITS:
2187 			icommits = imsg.data;
2188 			if (datalen != sizeof(*icommits) +
2189 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2190 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2191 				break;
2192 			}
2193 			for (i = 0; i < icommits->ncommits; i++) {
2194 				struct got_object_qid *qid;
2195 				uint8_t *sha1 = (uint8_t *)imsg.data +
2196 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2197 				err = got_object_qid_alloc_partial(&qid);
2198 				if (err)
2199 					break;
2200 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
2201 				SIMPLEQ_INSERT_TAIL(commit_ids, qid, entry);
2202 
2203 				/* The last commit may contain a change. */
2204 				if (i == icommits->ncommits - 1) {
2205 					*changed_commit_id =
2206 					    got_object_id_dup(qid->id);
2207 					if (*changed_commit_id == NULL) {
2208 						err = got_error_from_errno(
2209 						    "got_object_id_dup");
2210 						break;
2211 					}
2212 				}
2213 			}
2214 			break;
2215 		case GOT_IMSG_COMMIT:
2216 			if (*changed_commit_id == NULL) {
2217 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2218 				break;
2219 			}
2220 			err = get_commit_from_imsg(changed_commit, &imsg,
2221 			    datalen, ibuf);
2222 			break;
2223 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2224 			done = 1;
2225 			break;
2226 		default:
2227 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2228 			break;
2229 		}
2230 
2231 		imsg_free(&imsg);
2232 		if (err)
2233 			break;
2234 	}
2235 
2236 	if (err)
2237 		got_object_id_queue_free(commit_ids);
2238 	return err;
2239 }
2240 
2241 const struct got_error *
2242 got_privsep_send_commit_traversal_done(struct imsgbuf *ibuf)
2243 {
2244 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_DONE, 0, 0, -1,
2245 	    NULL, 0) == -1)
2246 		return got_error_from_errno("imsg_compose TRAVERSAL_DONE");
2247 
2248 	return flush_imsg(ibuf);
2249 }
2250 
2251 const struct got_error *
2252 got_privsep_unveil_exec_helpers(void)
2253 {
2254 	const char *helpers[] = {
2255 	    GOT_PATH_PROG_READ_PACK,
2256 	    GOT_PATH_PROG_READ_OBJECT,
2257 	    GOT_PATH_PROG_READ_COMMIT,
2258 	    GOT_PATH_PROG_READ_TREE,
2259 	    GOT_PATH_PROG_READ_BLOB,
2260 	    GOT_PATH_PROG_READ_TAG,
2261 	    GOT_PATH_PROG_READ_GITCONFIG,
2262 	    GOT_PATH_PROG_FETCH_PACK,
2263 	    GOT_PATH_PROG_INDEX_PACK,
2264 	};
2265 	int i;
2266 
2267 	for (i = 0; i < nitems(helpers); i++) {
2268 		if (unveil(helpers[i], "x") == 0)
2269 			continue;
2270 		return got_error_from_errno2("unveil", helpers[i]);
2271 	}
2272 
2273 	return NULL;
2274 }
2275 
2276 void
2277 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
2278 {
2279 	if (close(imsg_fds[0]) != 0) {
2280 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2281 		_exit(1);
2282 	}
2283 
2284 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
2285 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2286 		_exit(1);
2287 	}
2288 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
2289 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2290 		_exit(1);
2291 	}
2292 
2293 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
2294 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
2295 		    strerror(errno));
2296 		_exit(1);
2297 	}
2298 }