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Date:: Wed Mar 18 16:11:33 2020 UTC
Message:: send indexing progress via an imsg
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 const struct got_error *
372 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
373 {
374 	const struct got_error *err = NULL;
375 
376 	if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
377 	    == -1) {
378 		err = got_error_from_errno("imsg_compose TMPFD");
379 		close(fd);
380 		return err;
381 	}
382 
383 	return flush_imsg(ibuf);
384 }
385 
386 const struct got_error *
387 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
388 {
389 	struct got_imsg_object iobj;
390 
391 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
392 	iobj.type = obj->type;
393 	iobj.flags = obj->flags;
394 	iobj.hdrlen = obj->hdrlen;
395 	iobj.size = obj->size;
396 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
397 		iobj.pack_offset = obj->pack_offset;
398 		iobj.pack_idx = obj->pack_idx;
399 	}
400 
401 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
402 	    == -1)
403 		return got_error_from_errno("imsg_compose OBJECT");
404 
405 	return flush_imsg(ibuf);
406 }
407 
408 const struct got_error *
409 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
410    struct got_pathlist_head *have_refs)
411 {
412 	const struct got_error *err = NULL;
413 	struct ibuf *wbuf;
414 	size_t len, n_have_refs = 0;
415 	struct got_pathlist_entry *pe;
416 
417 	len = sizeof(struct got_imsg_fetch_symrefs);
418 	TAILQ_FOREACH(pe, have_refs, entry) {
419 		struct got_object_id *id = pe->data;
420 		len += sizeof(struct got_imsg_fetch_have_ref) +
421 		    pe->path_len + sizeof(id->sha1);
422 		n_have_refs++;
423 	}
424 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
425 		close(fd);
426 		return got_error(GOT_ERR_NO_SPACE);
427 	}
428 
429 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
430 	if (wbuf == NULL) {
431 		close(fd);
432 		return got_error_from_errno("imsg_create FETCH_REQUEST");
433 	}
434 
435 	/* Keep in sync with struct got_imsg_fetch_have_refs definition! */
436 	if (imsg_add(wbuf, &n_have_refs, sizeof(n_have_refs)) == -1) {
437 		err = got_error_from_errno("imsg_add FETCH_REQUEST");
438 		ibuf_free(wbuf);
439 		close(fd);
440 		return err;
441 	}
442 
443 	TAILQ_FOREACH(pe, have_refs, entry) {
444 		const char *name = pe->path;
445 		size_t name_len = pe->path_len;
446 		struct got_object_id *id = pe->data;
447 
448 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
449 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1) {
450 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
451 			ibuf_free(wbuf);
452 			close(fd);
453 			return err;
454 		}
455 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
456 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
457 			ibuf_free(wbuf);
458 			close(fd);
459 			return err;
460 		}
461 		if (imsg_add(wbuf, name, name_len) == -1) {
462 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
463 			ibuf_free(wbuf);
464 			close(fd);
465 			return err;
466 		}
467 	}
468 
469 	wbuf->fd = fd;
470 	imsg_close(ibuf, wbuf);
471 	return flush_imsg(ibuf);
472 }
473 
474 const struct got_error *
475 got_privsep_send_fetch_symrefs(struct imsgbuf *ibuf,
476     struct got_pathlist_head *symrefs)
477 {
478 	const struct got_error *err = NULL;
479 	struct ibuf *wbuf;
480 	size_t len, nsymrefs = 0;
481 	struct got_pathlist_entry *pe;
482 
483 	len = sizeof(struct got_imsg_fetch_symrefs);
484 	TAILQ_FOREACH(pe, symrefs, entry) {
485 		const char *target = pe->data;
486 		len += sizeof(struct got_imsg_fetch_symref) +
487 		    pe->path_len + strlen(target);
488 		nsymrefs++;
489 	}
490 
491 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
492 		return got_error(GOT_ERR_NO_SPACE);
493 
494 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_SYMREFS, 0, 0, len);
495 	if (wbuf == NULL)
496 		return got_error_from_errno("imsg_create FETCH_SYMREFS");
497 
498 	/* Keep in sync with struct got_imsg_fetch_symrefs definition! */
499 	if (imsg_add(wbuf, &nsymrefs, sizeof(nsymrefs)) == -1) {
500 		err = got_error_from_errno("imsg_add FETCH_SYMREFS");
501 		ibuf_free(wbuf);
502 		return err;
503 	}
504 
505 	TAILQ_FOREACH(pe, symrefs, entry) {
506 		const char *name = pe->path;
507 		size_t name_len = pe->path_len;
508 		const char *target = pe->data;
509 		size_t target_len = strlen(target);
510 
511 		/* Keep in sync with struct got_imsg_fetch_symref definition! */
512 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
513 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
514 			ibuf_free(wbuf);
515 			return err;
516 		}
517 		if (imsg_add(wbuf, &target_len, sizeof(target_len)) == -1) {
518 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
519 			ibuf_free(wbuf);
520 			return err;
521 		}
522 		if (imsg_add(wbuf, name, 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, target_len) == -1) {
528 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
529 			ibuf_free(wbuf);
530 			return err;
531 		}
532 	}
533 
534 	wbuf->fd = -1;
535 	imsg_close(ibuf, wbuf);
536 	return flush_imsg(ibuf);
537 }
538 
539 const struct got_error *
540 got_privsep_send_fetch_ref(struct imsgbuf *ibuf,
541     struct got_object_id *refid, const char *refname)
542 {
543 	const struct got_error *err = NULL;
544 	struct ibuf *wbuf;
545 	size_t len, reflen = strlen(refname);
546 
547 	len = sizeof(struct got_imsg_fetch_ref) + reflen;
548 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
549 		return got_error(GOT_ERR_NO_SPACE);
550 
551 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REF, 0, 0, len);
552 	if (wbuf == NULL)
553 		return got_error_from_errno("imsg_create FETCH_REF");
554 
555 	/* Keep in sync with struct got_imsg_fetch_ref definition! */
556 	if (imsg_add(wbuf, refid->sha1, SHA1_DIGEST_LENGTH) == -1) {
557 		err = got_error_from_errno("imsg_add FETCH_REF");
558 		ibuf_free(wbuf);
559 		return err;
560 	}
561 	if (imsg_add(wbuf, refname, reflen) == -1) {
562 		err = got_error_from_errno("imsg_add FETCH_REF");
563 		ibuf_free(wbuf);
564 		return err;
565 	}
566 
567 	wbuf->fd = -1;
568 	imsg_close(ibuf, wbuf);
569 	return flush_imsg(ibuf);
570 }
571 
572 const struct got_error *
573 got_privsep_send_fetch_server_progress(struct imsgbuf *ibuf, const char *msg,
574     size_t msglen)
575 {
576 	if (msglen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
577 		return got_error(GOT_ERR_NO_SPACE);
578 
579 	if (msglen == 0)
580 		return NULL;
581 
582 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_SERVER_PROGRESS, 0, 0, -1,
583 	    msg, msglen) == -1)
584 		return got_error_from_errno(
585 		    "imsg_compose FETCH_SERVER_PROGRESS");
586 
587 	return flush_imsg(ibuf);
588 }
589 
590 const struct got_error *
591 got_privsep_send_fetch_download_progress(struct imsgbuf *ibuf, off_t bytes)
592 {
593 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DOWNLOAD_PROGRESS, 0, 0, -1,
594 	    &bytes, sizeof(bytes)) == -1)
595 		return got_error_from_errno(
596 		    "imsg_compose FETCH_DOWNLOAD_PROGRESS");
597 
598 	return flush_imsg(ibuf);
599 }
600 
601 const struct got_error *
602 got_privsep_send_fetch_done(struct imsgbuf *ibuf, struct got_object_id hash)
603 {
604 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DONE, 0, 0, -1,
605 	    hash.sha1, SHA1_DIGEST_LENGTH) == -1)
606 		return got_error_from_errno("imsg_compose FETCH");
607 	return flush_imsg(ibuf);
608 }
609 
610 
611 const struct got_error *
612 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
613     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
614     off_t *packfile_size, struct imsgbuf *ibuf)
615 {
616 	const struct got_error *err = NULL;
617 	struct imsg imsg;
618 	size_t datalen;
619 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
620 	size_t n, remain;
621 	off_t off;
622 	int i;
623 
624 	*done = 0;
625 	*id = NULL;
626 	*refname = NULL;
627 	*server_progress = NULL;
628 
629 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
630 	if (err)
631 		return err;
632 
633 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
634 	switch (imsg.hdr.type) {
635 	case GOT_IMSG_ERROR:
636 		if (datalen < sizeof(struct got_imsg_error)) {
637 			err = got_error(GOT_ERR_PRIVSEP_LEN);
638 			break;
639 		}
640 		err = recv_imsg_error(&imsg, datalen);
641 		break;
642 	case GOT_IMSG_FETCH_SYMREFS:
643 		if (datalen < sizeof(*isymrefs)) {
644 			err = got_error(GOT_ERR_PRIVSEP_LEN);
645 			break;
646 		}
647 		if (isymrefs != NULL) {
648 			err = got_error(GOT_ERR_PRIVSEP_MSG);
649 			break;
650 		}
651 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
652 		off = sizeof(*isymrefs);
653 		remain = datalen - off;
654 		for (n = 0; n < isymrefs->nsymrefs; n++) {
655 			struct got_imsg_fetch_symref *s;
656 			char *name, *target;
657 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
658 				err = got_error(GOT_ERR_PRIVSEP_LEN);
659 				goto done;
660 			}
661 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
662 			off += sizeof(*s);
663 			remain -= sizeof(*s);
664 			if (remain < s->name_len) {
665 				err = got_error(GOT_ERR_PRIVSEP_LEN);
666 				goto done;
667 			}
668 			name = strndup(imsg.data + off, s->name_len);
669 			if (name == NULL) {
670 				err = got_error_from_errno("strndup");
671 				goto done;
672 			}
673 			off += s->name_len;
674 			remain -= s->name_len;
675 			if (remain < s->target_len) {
676 				err = got_error(GOT_ERR_PRIVSEP_LEN);
677 				free(name);
678 				goto done;
679 			}
680 			target = strndup(imsg.data + off, s->target_len);
681 			if (target == NULL) {
682 				err = got_error_from_errno("strndup");
683 				free(name);
684 				goto done;
685 			}
686 			off += s->target_len;
687 			remain -= s->target_len;
688 			err = got_pathlist_append(symrefs, name, target);
689 			if (err) {
690 				free(name);
691 				free(target);
692 				goto done;
693 			}
694 		}
695 		break;
696 	case GOT_IMSG_FETCH_REF:
697 		if (datalen <= SHA1_DIGEST_LENGTH) {
698 			err = got_error(GOT_ERR_PRIVSEP_MSG);
699 			break;
700 		}
701 		*id = malloc(sizeof(**id));
702 		if (*id == NULL) {
703 			err = got_error_from_errno("malloc");
704 			break;
705 		}
706 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
707 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
708 		    datalen - SHA1_DIGEST_LENGTH);
709 		if (*refname == NULL) {
710 			err = got_error_from_errno("strndup");
711 			break;
712 		}
713 		break;
714 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
715 		if (datalen == 0) {
716 			err = got_error(GOT_ERR_PRIVSEP_LEN);
717 			break;
718 		}
719 		*server_progress = strndup(imsg.data, datalen);
720 		if (*server_progress == NULL) {
721 			err = got_error_from_errno("strndup");
722 			break;
723 		}
724 		for (i = 0; i < datalen; i++) {
725 			if (!isprint((unsigned char)(*server_progress)[i]) &&
726 			    !isspace((unsigned char)(*server_progress)[i])) {
727 				err = got_error(GOT_ERR_PRIVSEP_MSG);
728 				free(*server_progress);
729 				*server_progress = NULL;
730 				goto done;
731 			}
732 		}
733 		break;
734 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
735 		if (datalen < sizeof(*packfile_size)) {
736 			err = got_error(GOT_ERR_PRIVSEP_MSG);
737 			break;
738 		}
739 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
740 		break;
741 	case GOT_IMSG_FETCH_DONE:
742 		*id = malloc(sizeof(**id));
743 		if (*id == NULL) {
744 			err = got_error_from_errno("malloc");
745 			break;
746 		}
747 		if (datalen != SHA1_DIGEST_LENGTH) {
748 			err = got_error(GOT_ERR_PRIVSEP_MSG);
749 			break;
750 		}
751 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
752 		*done = 1;
753 		break;
754 	default:
755 		err = got_error(GOT_ERR_PRIVSEP_MSG);
756 		break;
757 	}
758 done:
759 	if (err) {
760 		free(*id);
761 		*id = NULL;
762 		free(*refname);
763 		*refname = NULL;
764 	}
765 	imsg_free(&imsg);
766 	return err;
767 }
768 
769 const struct got_error *
770 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, int fd, struct got_object_id *hash)
771 {
772 	const struct got_error *err = NULL;
773 
774 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
775 	    hash->sha1, SHA1_DIGEST_LENGTH) == -1) {
776 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
777 		close(fd);
778 		return err;
779 	}
780 	return flush_imsg(ibuf);
781 }
782 
783 const struct got_error *
784 got_privsep_send_index_pack_progress(struct imsgbuf *ibuf, int nobjects_total,
785     int nobjects_indexed)
786 {
787 	struct got_imsg_index_pack_progress iprogress;
788 
789 	iprogress.nobjects_total = nobjects_total;
790 	iprogress.nobjects_indexed = nobjects_indexed;
791 
792 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_PROGRESS, 0, 0, -1,
793 	    &iprogress, sizeof(iprogress)) == -1)
794 		return got_error_from_errno("imsg_compose IDXPACK_PROGRESS");
795 
796 	return flush_imsg(ibuf);
797 }
798 
799 const struct got_error *
800 got_privsep_send_index_pack_done(struct imsgbuf *ibuf)
801 {
802 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_DONE, 0, 0, -1, NULL, 0) == -1)
803 		return got_error_from_errno("imsg_compose FETCH");
804 	return flush_imsg(ibuf);
805 }
806 
807 const struct got_error *
808 got_privsep_recv_index_progress(int *done, int *nobjects_total,
809     int *nobjects_indexed, struct imsgbuf *ibuf)
810 {
811 	const struct got_error *err = NULL;
812 	struct imsg imsg;
813 	struct got_imsg_index_pack_progress *iprogress;
814 	size_t datalen;
815 
816 	*done = 0;
817 	*nobjects_total = 0;
818 	*nobjects_indexed = 0;
819 
820 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
821 	if (err)
822 		return err;
823 
824 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
825 	switch (imsg.hdr.type) {
826 	case GOT_IMSG_ERROR:
827 		if (datalen < sizeof(struct got_imsg_error)) {
828 			err = got_error(GOT_ERR_PRIVSEP_LEN);
829 			break;
830 		}
831 		err = recv_imsg_error(&imsg, datalen);
832 		break;
833 	case GOT_IMSG_IDXPACK_PROGRESS:
834 		if (datalen < sizeof(*iprogress)) {
835 			err = got_error(GOT_ERR_PRIVSEP_LEN);
836 			break;
837 		}
838 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
839 		*nobjects_total = iprogress->nobjects_total;
840 		*nobjects_indexed = iprogress->nobjects_indexed;
841 		break;
842 	case GOT_IMSG_IDXPACK_DONE:
843 		if (datalen != 0) {
844 			err = got_error(GOT_ERR_PRIVSEP_LEN);
845 			break;
846 		}
847 		*done = 1;
848 		break;
849 	default:
850 		err = got_error(GOT_ERR_PRIVSEP_MSG);
851 		break;
852 	}
853 
854 	imsg_free(&imsg);
855 	return err;
856 }
857 
858 const struct got_error *
859 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
860     struct imsgbuf *ibuf)
861 {
862 	const struct got_error *err = NULL;
863 	struct got_imsg_object *iobj;
864 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
865 
866 	if (datalen != sizeof(*iobj))
867 		return got_error(GOT_ERR_PRIVSEP_LEN);
868 	iobj = imsg->data;
869 
870 	*obj = calloc(1, sizeof(**obj));
871 	if (*obj == NULL)
872 		return got_error_from_errno("calloc");
873 
874 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
875 	(*obj)->type = iobj->type;
876 	(*obj)->flags = iobj->flags;
877 	(*obj)->hdrlen = iobj->hdrlen;
878 	(*obj)->size = iobj->size;
879 	/* path_packfile is handled by caller */
880 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
881 		(*obj)->pack_offset = iobj->pack_offset;
882 		(*obj)->pack_idx = iobj->pack_idx;
883 	}
884 
885 	return err;
886 }
887 
888 const struct got_error *
889 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
890 {
891 	const struct got_error *err = NULL;
892 	struct imsg imsg;
893 	const size_t min_datalen =
894 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
895 
896 	*obj = NULL;
897 
898 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
899 	if (err)
900 		return err;
901 
902 	switch (imsg.hdr.type) {
903 	case GOT_IMSG_OBJECT:
904 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
905 		break;
906 	default:
907 		err = got_error(GOT_ERR_PRIVSEP_MSG);
908 		break;
909 	}
910 
911 	imsg_free(&imsg);
912 
913 	return err;
914 }
915 
916 static const struct got_error *
917 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
918     size_t logmsg_len)
919 {
920 	const struct got_error *err = NULL;
921 	size_t offset, remain;
922 
923 	offset = 0;
924 	remain = logmsg_len;
925 	while (remain > 0) {
926 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
927 
928 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
929 		    commit->logmsg + offset, n) == -1) {
930 			err = got_error_from_errno("imsg_compose "
931 			    "COMMIT_LOGMSG");
932 			break;
933 		}
934 
935 		err = flush_imsg(ibuf);
936 		if (err)
937 			break;
938 
939 		offset += n;
940 		remain -= n;
941 	}
942 
943 	return err;
944 }
945 
946 const struct got_error *
947 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
948 {
949 	const struct got_error *err = NULL;
950 	struct got_imsg_commit_object *icommit;
951 	uint8_t *buf;
952 	size_t len, total;
953 	struct got_object_qid *qid;
954 	size_t author_len = strlen(commit->author);
955 	size_t committer_len = strlen(commit->committer);
956 	size_t logmsg_len = strlen(commit->logmsg);
957 
958 	total = sizeof(*icommit) + author_len + committer_len +
959 	    commit->nparents * SHA1_DIGEST_LENGTH;
960 
961 	buf = malloc(total);
962 	if (buf == NULL)
963 		return got_error_from_errno("malloc");
964 
965 	icommit = (struct got_imsg_commit_object *)buf;
966 	memcpy(icommit->tree_id, commit->tree_id->sha1,
967 	    sizeof(icommit->tree_id));
968 	icommit->author_len = author_len;
969 	icommit->author_time = commit->author_time;
970 	icommit->author_gmtoff = commit->author_gmtoff;
971 	icommit->committer_len = committer_len;
972 	icommit->committer_time = commit->committer_time;
973 	icommit->committer_gmtoff = commit->committer_gmtoff;
974 	icommit->logmsg_len = logmsg_len;
975 	icommit->nparents = commit->nparents;
976 
977 	len = sizeof(*icommit);
978 	memcpy(buf + len, commit->author, author_len);
979 	len += author_len;
980 	memcpy(buf + len, commit->committer, committer_len);
981 	len += committer_len;
982 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
983 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
984 		len += SHA1_DIGEST_LENGTH;
985 	}
986 
987 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
988 		err = got_error_from_errno("imsg_compose COMMIT");
989 		goto done;
990 	}
991 
992 	if (logmsg_len == 0 ||
993 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
994 		err = flush_imsg(ibuf);
995 		if (err)
996 			goto done;
997 	}
998 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
999 done:
1000 	free(buf);
1001 	return err;
1002 }
1003 
1004 static const struct got_error *
1005 get_commit_from_imsg(struct got_commit_object **commit,
1006     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1007 {
1008 	const struct got_error *err = NULL;
1009 	struct got_imsg_commit_object *icommit;
1010 	size_t len = 0;
1011 	int i;
1012 
1013 	if (datalen < sizeof(*icommit))
1014 		return got_error(GOT_ERR_PRIVSEP_LEN);
1015 
1016 	icommit = imsg->data;
1017 	if (datalen != sizeof(*icommit) + icommit->author_len +
1018 	    icommit->committer_len +
1019 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1020 		return got_error(GOT_ERR_PRIVSEP_LEN);
1021 
1022 	if (icommit->nparents < 0)
1023 		return got_error(GOT_ERR_PRIVSEP_LEN);
1024 
1025 	len += sizeof(*icommit);
1026 
1027 	*commit = got_object_commit_alloc_partial();
1028 	if (*commit == NULL)
1029 		return got_error_from_errno(
1030 		    "got_object_commit_alloc_partial");
1031 
1032 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1033 	    SHA1_DIGEST_LENGTH);
1034 	(*commit)->author_time = icommit->author_time;
1035 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1036 	(*commit)->committer_time = icommit->committer_time;
1037 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1038 
1039 	if (icommit->author_len == 0) {
1040 		(*commit)->author = strdup("");
1041 		if ((*commit)->author == NULL) {
1042 			err = got_error_from_errno("strdup");
1043 			goto done;
1044 		}
1045 	} else {
1046 		(*commit)->author = malloc(icommit->author_len + 1);
1047 		if ((*commit)->author == NULL) {
1048 			err = got_error_from_errno("malloc");
1049 			goto done;
1050 		}
1051 		memcpy((*commit)->author, imsg->data + len,
1052 		    icommit->author_len);
1053 		(*commit)->author[icommit->author_len] = '\0';
1054 	}
1055 	len += icommit->author_len;
1056 
1057 	if (icommit->committer_len == 0) {
1058 		(*commit)->committer = strdup("");
1059 		if ((*commit)->committer == NULL) {
1060 			err = got_error_from_errno("strdup");
1061 			goto done;
1062 		}
1063 	} else {
1064 		(*commit)->committer =
1065 		    malloc(icommit->committer_len + 1);
1066 		if ((*commit)->committer == NULL) {
1067 			err = got_error_from_errno("malloc");
1068 			goto done;
1069 		}
1070 		memcpy((*commit)->committer, imsg->data + len,
1071 		    icommit->committer_len);
1072 		(*commit)->committer[icommit->committer_len] = '\0';
1073 	}
1074 	len += icommit->committer_len;
1075 
1076 	if (icommit->logmsg_len == 0) {
1077 		(*commit)->logmsg = strdup("");
1078 		if ((*commit)->logmsg == NULL) {
1079 			err = got_error_from_errno("strdup");
1080 			goto done;
1081 		}
1082 	} else {
1083 		size_t offset = 0, remain = icommit->logmsg_len;
1084 
1085 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1086 		if ((*commit)->logmsg == NULL) {
1087 			err = got_error_from_errno("malloc");
1088 			goto done;
1089 		}
1090 		while (remain > 0) {
1091 			struct imsg imsg_log;
1092 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1093 			    remain);
1094 
1095 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1096 			if (err)
1097 				goto done;
1098 
1099 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1100 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1101 				goto done;
1102 			}
1103 
1104 			memcpy((*commit)->logmsg + offset,
1105 			    imsg_log.data, n);
1106 			imsg_free(&imsg_log);
1107 			offset += n;
1108 			remain -= n;
1109 		}
1110 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1111 	}
1112 
1113 	for (i = 0; i < icommit->nparents; i++) {
1114 		struct got_object_qid *qid;
1115 
1116 		err = got_object_qid_alloc_partial(&qid);
1117 		if (err)
1118 			break;
1119 		memcpy(qid->id, imsg->data + len +
1120 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
1121 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1122 		(*commit)->nparents++;
1123 	}
1124 done:
1125 	if (err) {
1126 		got_object_commit_close(*commit);
1127 		*commit = NULL;
1128 	}
1129 	return err;
1130 }
1131 
1132 const struct got_error *
1133 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1134 {
1135 	const struct got_error *err = NULL;
1136 	struct imsg imsg;
1137 	size_t datalen;
1138 	const size_t min_datalen =
1139 	    MIN(sizeof(struct got_imsg_error),
1140 	    sizeof(struct got_imsg_commit_object));
1141 
1142 	*commit = NULL;
1143 
1144 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1145 	if (err)
1146 		return err;
1147 
1148 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1149 
1150 	switch (imsg.hdr.type) {
1151 	case GOT_IMSG_COMMIT:
1152 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1153 		break;
1154 	default:
1155 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1156 		break;
1157 	}
1158 
1159 	imsg_free(&imsg);
1160 
1161 	return err;
1162 }
1163 
1164 const struct got_error *
1165 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
1166     int nentries)
1167 {
1168 	const struct got_error *err = NULL;
1169 	struct got_imsg_tree_object itree;
1170 	struct got_pathlist_entry *pe;
1171 	size_t totlen;
1172 	int nimsg; /* number of imsg queued in ibuf */
1173 
1174 	itree.nentries = nentries;
1175 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1176 	    == -1)
1177 		return got_error_from_errno("imsg_compose TREE");
1178 
1179 	totlen = sizeof(itree);
1180 	nimsg = 1;
1181 	TAILQ_FOREACH(pe, entries, entry) {
1182 		const char *name = pe->path;
1183 		struct got_parsed_tree_entry *pte = pe->data;
1184 		struct ibuf *wbuf;
1185 		size_t namelen = strlen(name);
1186 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
1187 
1188 		if (len > MAX_IMSGSIZE)
1189 			return got_error(GOT_ERR_NO_SPACE);
1190 
1191 		nimsg++;
1192 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
1193 			err = flush_imsg(ibuf);
1194 			if (err)
1195 				return err;
1196 			nimsg = 0;
1197 		}
1198 
1199 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
1200 		if (wbuf == NULL)
1201 			return got_error_from_errno("imsg_create TREE_ENTRY");
1202 
1203 		/* Keep in sync with struct got_imsg_tree_object definition! */
1204 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
1205 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1206 			ibuf_free(wbuf);
1207 			return err;
1208 		}
1209 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
1210 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1211 			ibuf_free(wbuf);
1212 			return err;
1213 		}
1214 
1215 		if (imsg_add(wbuf, name, namelen) == -1) {
1216 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1217 			ibuf_free(wbuf);
1218 			return err;
1219 		}
1220 
1221 		wbuf->fd = -1;
1222 		imsg_close(ibuf, wbuf);
1223 
1224 		totlen += len;
1225 	}
1226 
1227 	return flush_imsg(ibuf);
1228 }
1229 
1230 const struct got_error *
1231 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1232 {
1233 	const struct got_error *err = NULL;
1234 	const size_t min_datalen =
1235 	    MIN(sizeof(struct got_imsg_error),
1236 	    sizeof(struct got_imsg_tree_object));
1237 	struct got_imsg_tree_object *itree;
1238 	int nentries = 0;
1239 
1240 	*tree = NULL;
1241 get_more:
1242 	err = read_imsg(ibuf);
1243 	if (err)
1244 		goto done;
1245 
1246 	for (;;) {
1247 		struct imsg imsg;
1248 		size_t n;
1249 		size_t datalen;
1250 		struct got_imsg_tree_entry *ite;
1251 		struct got_tree_entry *te = NULL;
1252 
1253 		n = imsg_get(ibuf, &imsg);
1254 		if (n == 0) {
1255 			if (*tree && (*tree)->nentries != nentries)
1256 				goto get_more;
1257 			break;
1258 		}
1259 
1260 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
1261 			return got_error(GOT_ERR_PRIVSEP_LEN);
1262 
1263 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1264 
1265 		switch (imsg.hdr.type) {
1266 		case GOT_IMSG_ERROR:
1267 			err = recv_imsg_error(&imsg, datalen);
1268 			break;
1269 		case GOT_IMSG_TREE:
1270 			/* This message should only appear once. */
1271 			if (*tree != NULL) {
1272 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1273 				break;
1274 			}
1275 			if (datalen != sizeof(*itree)) {
1276 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1277 				break;
1278 			}
1279 			itree = imsg.data;
1280 			*tree = malloc(sizeof(**tree));
1281 			if (*tree == NULL) {
1282 				err = got_error_from_errno("malloc");
1283 				break;
1284 			}
1285 			(*tree)->entries = calloc(itree->nentries,
1286 			    sizeof(struct got_tree_entry));
1287 			if ((*tree)->entries == NULL) {
1288 				err = got_error_from_errno("malloc");
1289 				break;
1290 			}
1291 			(*tree)->nentries = itree->nentries;
1292 			(*tree)->refcnt = 0;
1293 			break;
1294 		case GOT_IMSG_TREE_ENTRY:
1295 			/* This message should be preceeded by GOT_IMSG_TREE. */
1296 			if (*tree == NULL) {
1297 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1298 				break;
1299 			}
1300 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
1301 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1302 				break;
1303 			}
1304 
1305 			/* Remaining data contains the entry's name. */
1306 			datalen -= sizeof(*ite);
1307 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
1308 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1309 				break;
1310 			}
1311 			ite = imsg.data;
1312 
1313 			if (datalen + 1 > sizeof(te->name)) {
1314 				err = got_error(GOT_ERR_NO_SPACE);
1315 				break;
1316 			}
1317 			te = &(*tree)->entries[nentries];
1318 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
1319 			te->name[datalen] = '\0';
1320 
1321 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
1322 			te->mode = ite->mode;
1323 			te->idx = nentries;
1324 			nentries++;
1325 			break;
1326 		default:
1327 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1328 			break;
1329 		}
1330 
1331 		imsg_free(&imsg);
1332 	}
1333 done:
1334 	if (*tree && (*tree)->nentries != nentries) {
1335 		if (err == NULL)
1336 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1337 		got_object_tree_close(*tree);
1338 		*tree = NULL;
1339 	}
1340 
1341 	return err;
1342 }
1343 
1344 const struct got_error *
1345 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1346     const uint8_t *data)
1347 {
1348 	struct got_imsg_blob iblob;
1349 
1350 	iblob.size = size;
1351 	iblob.hdrlen = hdrlen;
1352 
1353 	if (data) {
1354 		uint8_t *buf;
1355 
1356 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1357 			return got_error(GOT_ERR_NO_SPACE);
1358 
1359 		buf = malloc(sizeof(iblob) + size);
1360 		if (buf == NULL)
1361 			return got_error_from_errno("malloc");
1362 
1363 		memcpy(buf, &iblob, sizeof(iblob));
1364 		memcpy(buf + sizeof(iblob), data, size);
1365 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1366 		   sizeof(iblob) + size) == -1) {
1367 			free(buf);
1368 			return got_error_from_errno("imsg_compose BLOB");
1369 		}
1370 		free(buf);
1371 	} else {
1372 		/* Data has already been written to file descriptor. */
1373 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1374 		    sizeof(iblob)) == -1)
1375 			return got_error_from_errno("imsg_compose BLOB");
1376 	}
1377 
1378 
1379 	return flush_imsg(ibuf);
1380 }
1381 
1382 const struct got_error *
1383 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1384     struct imsgbuf *ibuf)
1385 {
1386 	const struct got_error *err = NULL;
1387 	struct imsg imsg;
1388 	struct got_imsg_blob *iblob;
1389 	size_t datalen;
1390 
1391 	*outbuf = NULL;
1392 
1393 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1394 	if (err)
1395 		return err;
1396 
1397 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1398 
1399 	switch (imsg.hdr.type) {
1400 	case GOT_IMSG_BLOB:
1401 		if (datalen < sizeof(*iblob)) {
1402 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1403 			break;
1404 		}
1405 		iblob = imsg.data;
1406 		*size = iblob->size;
1407 		*hdrlen = iblob->hdrlen;
1408 
1409 		if (datalen == sizeof(*iblob)) {
1410 			/* Data has been written to file descriptor. */
1411 			break;
1412 		}
1413 
1414 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1415 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1416 			break;
1417 		}
1418 
1419 		*outbuf = malloc(*size);
1420 		if (*outbuf == NULL) {
1421 			err = got_error_from_errno("malloc");
1422 			break;
1423 		}
1424 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1425 		break;
1426 	default:
1427 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1428 		break;
1429 	}
1430 
1431 	imsg_free(&imsg);
1432 
1433 	return err;
1434 }
1435 
1436 static const struct got_error *
1437 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1438 {
1439 	const struct got_error *err = NULL;
1440 	size_t offset, remain;
1441 
1442 	offset = 0;
1443 	remain = tagmsg_len;
1444 	while (remain > 0) {
1445 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1446 
1447 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1448 		    tag->tagmsg + offset, n) == -1) {
1449 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1450 			break;
1451 		}
1452 
1453 		err = flush_imsg(ibuf);
1454 		if (err)
1455 			break;
1456 
1457 		offset += n;
1458 		remain -= n;
1459 	}
1460 
1461 	return err;
1462 }
1463 
1464 const struct got_error *
1465 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1466 {
1467 	const struct got_error *err = NULL;
1468 	struct got_imsg_tag_object *itag;
1469 	uint8_t *buf;
1470 	size_t len, total;
1471 	size_t tag_len = strlen(tag->tag);
1472 	size_t tagger_len = strlen(tag->tagger);
1473 	size_t tagmsg_len = strlen(tag->tagmsg);
1474 
1475 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1476 
1477 	buf = malloc(total);
1478 	if (buf == NULL)
1479 		return got_error_from_errno("malloc");
1480 
1481 	itag = (struct got_imsg_tag_object *)buf;
1482 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1483 	itag->obj_type = tag->obj_type;
1484 	itag->tag_len = tag_len;
1485 	itag->tagger_len = tagger_len;
1486 	itag->tagger_time = tag->tagger_time;
1487 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1488 	itag->tagmsg_len = tagmsg_len;
1489 
1490 	len = sizeof(*itag);
1491 	memcpy(buf + len, tag->tag, tag_len);
1492 	len += tag_len;
1493 	memcpy(buf + len, tag->tagger, tagger_len);
1494 	len += tagger_len;
1495 
1496 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1497 		err = got_error_from_errno("imsg_compose TAG");
1498 		goto done;
1499 	}
1500 
1501 	if (tagmsg_len == 0 ||
1502 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1503 		err = flush_imsg(ibuf);
1504 		if (err)
1505 			goto done;
1506 	}
1507 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1508 done:
1509 	free(buf);
1510 	return err;
1511 }
1512 
1513 const struct got_error *
1514 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1515 {
1516 	const struct got_error *err = NULL;
1517 	struct imsg imsg;
1518 	struct got_imsg_tag_object *itag;
1519 	size_t len, datalen;
1520 	const size_t min_datalen =
1521 	    MIN(sizeof(struct got_imsg_error),
1522 	    sizeof(struct got_imsg_tag_object));
1523 
1524 	*tag = NULL;
1525 
1526 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1527 	if (err)
1528 		return err;
1529 
1530 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1531 	len = 0;
1532 
1533 	switch (imsg.hdr.type) {
1534 	case GOT_IMSG_TAG:
1535 		if (datalen < sizeof(*itag)) {
1536 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1537 			break;
1538 		}
1539 		itag = imsg.data;
1540 		if (datalen != sizeof(*itag) + itag->tag_len +
1541 		    itag->tagger_len) {
1542 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1543 			break;
1544 		}
1545 		len += sizeof(*itag);
1546 
1547 		*tag = calloc(1, sizeof(**tag));
1548 		if (*tag == NULL) {
1549 			err = got_error_from_errno("calloc");
1550 			break;
1551 		}
1552 
1553 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1554 
1555 		if (itag->tag_len == 0) {
1556 			(*tag)->tag = strdup("");
1557 			if ((*tag)->tag == NULL) {
1558 				err = got_error_from_errno("strdup");
1559 				break;
1560 			}
1561 		} else {
1562 			(*tag)->tag = malloc(itag->tag_len + 1);
1563 			if ((*tag)->tag == NULL) {
1564 				err = got_error_from_errno("malloc");
1565 				break;
1566 			}
1567 			memcpy((*tag)->tag, imsg.data + len,
1568 			    itag->tag_len);
1569 			(*tag)->tag[itag->tag_len] = '\0';
1570 		}
1571 		len += itag->tag_len;
1572 
1573 		(*tag)->obj_type = itag->obj_type;
1574 		(*tag)->tagger_time = itag->tagger_time;
1575 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1576 
1577 		if (itag->tagger_len == 0) {
1578 			(*tag)->tagger = strdup("");
1579 			if ((*tag)->tagger == NULL) {
1580 				err = got_error_from_errno("strdup");
1581 				break;
1582 			}
1583 		} else {
1584 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1585 			if ((*tag)->tagger == NULL) {
1586 				err = got_error_from_errno("malloc");
1587 				break;
1588 			}
1589 			memcpy((*tag)->tagger, imsg.data + len,
1590 			    itag->tagger_len);
1591 			(*tag)->tagger[itag->tagger_len] = '\0';
1592 		}
1593 		len += itag->tagger_len;
1594 
1595 		if (itag->tagmsg_len == 0) {
1596 			(*tag)->tagmsg = strdup("");
1597 			if ((*tag)->tagmsg == NULL) {
1598 				err = got_error_from_errno("strdup");
1599 				break;
1600 			}
1601 		} else {
1602 			size_t offset = 0, remain = itag->tagmsg_len;
1603 
1604 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1605 			if ((*tag)->tagmsg == NULL) {
1606 				err = got_error_from_errno("malloc");
1607 				break;
1608 			}
1609 			while (remain > 0) {
1610 				struct imsg imsg_log;
1611 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1612 				    remain);
1613 
1614 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1615 				if (err)
1616 					return err;
1617 
1618 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1619 					return got_error(GOT_ERR_PRIVSEP_MSG);
1620 
1621 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1622 				    n);
1623 				imsg_free(&imsg_log);
1624 				offset += n;
1625 				remain -= n;
1626 			}
1627 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1628 		}
1629 
1630 		break;
1631 	default:
1632 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1633 		break;
1634 	}
1635 
1636 	imsg_free(&imsg);
1637 
1638 	return err;
1639 }
1640 
1641 const struct got_error *
1642 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1643     struct got_packidx *packidx)
1644 {
1645 	const struct got_error *err = NULL;
1646 	struct got_imsg_packidx ipackidx;
1647 	struct got_imsg_pack ipack;
1648 	int fd;
1649 
1650 	ipackidx.len = packidx->len;
1651 	fd = dup(packidx->fd);
1652 	if (fd == -1)
1653 		return got_error_from_errno("dup");
1654 
1655 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1656 	    sizeof(ipackidx)) == -1) {
1657 		err = got_error_from_errno("imsg_compose PACKIDX");
1658 		close(fd);
1659 		return err;
1660 	}
1661 
1662 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1663 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1664 		return got_error(GOT_ERR_NO_SPACE);
1665 	ipack.filesize = pack->filesize;
1666 
1667 	fd = dup(pack->fd);
1668 	if (fd == -1)
1669 		return got_error_from_errno("dup");
1670 
1671 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1672 	    == -1) {
1673 		err = got_error_from_errno("imsg_compose PACK");
1674 		close(fd);
1675 		return err;
1676 	}
1677 
1678 	return flush_imsg(ibuf);
1679 }
1680 
1681 const struct got_error *
1682 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1683     struct got_object_id *id)
1684 {
1685 	struct got_imsg_packed_object iobj;
1686 
1687 	iobj.idx = idx;
1688 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1689 
1690 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1691 	    &iobj, sizeof(iobj)) == -1)
1692 		return got_error_from_errno("imsg_compose "
1693 		    "PACKED_OBJECT_REQUEST");
1694 
1695 	return flush_imsg(ibuf);
1696 }
1697 
1698 const struct got_error *
1699 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1700 {
1701 	const struct got_error *err = NULL;
1702 
1703 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1704 	    NULL, 0) == -1) {
1705 		err = got_error_from_errno("imsg_compose "
1706 		    "GITCONFIG_PARSE_REQUEST");
1707 		close(fd);
1708 		return err;
1709 	}
1710 
1711 	return flush_imsg(ibuf);
1712 }
1713 
1714 const struct got_error *
1715 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1716 {
1717 	if (imsg_compose(ibuf,
1718 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1719 	    NULL, 0) == -1)
1720 		return got_error_from_errno("imsg_compose "
1721 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1722 
1723 	return flush_imsg(ibuf);
1724 }
1725 
1726 const struct got_error *
1727 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1728 {
1729 	if (imsg_compose(ibuf,
1730 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1731 		return got_error_from_errno("imsg_compose "
1732 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1733 
1734 	return flush_imsg(ibuf);
1735 }
1736 
1737 const struct got_error *
1738 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1739 {
1740 	if (imsg_compose(ibuf,
1741 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1742 		return got_error_from_errno("imsg_compose "
1743 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1744 
1745 	return flush_imsg(ibuf);
1746 }
1747 
1748 const struct got_error *
1749 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1750 {
1751 	if (imsg_compose(ibuf,
1752 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1753 		return got_error_from_errno("imsg_compose "
1754 		    "GITCONFIG_REMOTE_REQUEST");
1755 
1756 	return flush_imsg(ibuf);
1757 }
1758 
1759 const struct got_error *
1760 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
1761 {
1762 	if (imsg_compose(ibuf,
1763 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
1764 		return got_error_from_errno("imsg_compose "
1765 		    "GITCONFIG_OWNER_REQUEST");
1766 
1767 	return flush_imsg(ibuf);
1768 }
1769 
1770 const struct got_error *
1771 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1772 {
1773 	size_t len = value ? strlen(value) + 1 : 0;
1774 
1775 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1776 	    value, len) == -1)
1777 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1778 
1779 	return flush_imsg(ibuf);
1780 }
1781 
1782 const struct got_error *
1783 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1784 {
1785 	const struct got_error *err = NULL;
1786 	struct imsg imsg;
1787 	size_t datalen;
1788 	const size_t min_datalen = 0;
1789 
1790 	*str = NULL;
1791 
1792 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1793 	if (err)
1794 		return err;
1795 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1796 
1797 	switch (imsg.hdr.type) {
1798 	case GOT_IMSG_GITCONFIG_STR_VAL:
1799 		if (datalen == 0)
1800 			break;
1801 		*str = malloc(datalen);
1802 		if (*str == NULL) {
1803 			err = got_error_from_errno("malloc");
1804 			break;
1805 		}
1806 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1807 			err = got_error(GOT_ERR_NO_SPACE);
1808 		break;
1809 	default:
1810 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1811 		break;
1812 	}
1813 
1814 	imsg_free(&imsg);
1815 	return err;
1816 }
1817 
1818 const struct got_error *
1819 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1820 {
1821 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1822 	    &value, sizeof(value)) == -1)
1823 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1824 
1825 	return flush_imsg(ibuf);
1826 }
1827 
1828 const struct got_error *
1829 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1830 {
1831 	const struct got_error *err = NULL;
1832 	struct imsg imsg;
1833 	size_t datalen;
1834 	const size_t min_datalen =
1835 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1836 
1837 	*val = 0;
1838 
1839 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1840 	if (err)
1841 		return err;
1842 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1843 
1844 	switch (imsg.hdr.type) {
1845 	case GOT_IMSG_GITCONFIG_INT_VAL:
1846 		if (datalen != sizeof(*val)) {
1847 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1848 			break;
1849 		}
1850 		memcpy(val, imsg.data, sizeof(*val));
1851 		break;
1852 	default:
1853 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1854 		break;
1855 	}
1856 
1857 	imsg_free(&imsg);
1858 	return err;
1859 }
1860 
1861 const struct got_error *
1862 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1863     struct got_remote_repo *remotes, int nremotes)
1864 {
1865 	const struct got_error *err = NULL;
1866 	struct got_imsg_remotes iremotes;
1867 	int i;
1868 
1869 	iremotes.nremotes = nremotes;
1870 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1871 	    &iremotes, sizeof(iremotes)) == -1)
1872 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1873 
1874 	err = flush_imsg(ibuf);
1875 	imsg_clear(ibuf);
1876 	if (err)
1877 		return err;
1878 
1879 	for (i = 0; i < nremotes; i++) {
1880 		struct got_imsg_remote iremote;
1881 		size_t len = sizeof(iremote);
1882 		struct ibuf *wbuf;
1883 
1884 		iremote.name_len = strlen(remotes[i].name);
1885 		len += iremote.name_len;
1886 		iremote.url_len = strlen(remotes[i].url);
1887 		len += iremote.url_len;
1888 
1889 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1890 		if (wbuf == NULL)
1891 			return got_error_from_errno(
1892 			    "imsg_create GITCONFIG_REMOTE");
1893 
1894 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1895 			err = got_error_from_errno(
1896 			    "imsg_add GIITCONFIG_REMOTE");
1897 			ibuf_free(wbuf);
1898 			return err;
1899 		}
1900 
1901 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1902 			err = got_error_from_errno(
1903 			    "imsg_add GIITCONFIG_REMOTE");
1904 			ibuf_free(wbuf);
1905 			return err;
1906 		}
1907 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1908 			err = got_error_from_errno(
1909 			    "imsg_add GIITCONFIG_REMOTE");
1910 			ibuf_free(wbuf);
1911 			return err;
1912 		}
1913 
1914 		wbuf->fd = -1;
1915 		imsg_close(ibuf, wbuf);
1916 		err = flush_imsg(ibuf);
1917 		if (err)
1918 			return err;
1919 	}
1920 
1921 	return NULL;
1922 }
1923 
1924 const struct got_error *
1925 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1926     int *nremotes, struct imsgbuf *ibuf)
1927 {
1928 	const struct got_error *err = NULL;
1929 	struct imsg imsg;
1930 	size_t datalen;
1931 	struct got_imsg_remotes iremotes;
1932 	struct got_imsg_remote iremote;
1933 
1934 	*remotes = NULL;
1935 	*nremotes = 0;
1936 	iremotes.nremotes = 0;
1937 
1938 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
1939 	if (err)
1940 		return err;
1941 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1942 
1943 	switch (imsg.hdr.type) {
1944 	case GOT_IMSG_GITCONFIG_REMOTES:
1945 		if (datalen != sizeof(iremotes)) {
1946 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1947 			break;
1948 		}
1949 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
1950 		if (iremotes.nremotes == 0) {
1951 			imsg_free(&imsg);
1952 			return NULL;
1953 		}
1954 		break;
1955 	default:
1956 		imsg_free(&imsg);
1957 		return got_error(GOT_ERR_PRIVSEP_MSG);
1958 	}
1959 
1960 	imsg_free(&imsg);
1961 
1962 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(iremote));
1963 	if (*remotes == NULL)
1964 		return got_error_from_errno("recallocarray");
1965 
1966 	while (*nremotes < iremotes.nremotes) {
1967 		struct got_remote_repo *remote;
1968 	
1969 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
1970 		if (err)
1971 			break;
1972 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1973 
1974 		switch (imsg.hdr.type) {
1975 		case GOT_IMSG_GITCONFIG_REMOTE:
1976 			remote = &(*remotes)[*nremotes];
1977 			if (datalen < sizeof(iremote)) {
1978 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1979 				break;
1980 			}
1981 			memcpy(&iremote, imsg.data, sizeof(iremote));
1982 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
1983 			    (sizeof(iremote) + iremote.name_len +
1984 			    iremote.url_len) > datalen) {
1985 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1986 				break;
1987 			}
1988 			remote->name = strndup(imsg.data + sizeof(iremote),
1989 			    iremote.name_len);
1990 			if (remote->name == NULL) {
1991 				err = got_error_from_errno("strndup");
1992 				break;
1993 			}
1994 			remote->url = strndup(imsg.data + sizeof(iremote) +
1995 			    iremote.name_len, iremote.url_len);
1996 			if (remote->url == NULL) {
1997 				err = got_error_from_errno("strndup");
1998 				free(remote->name);
1999 				break;
2000 			}
2001 			(*nremotes)++;
2002 			break;
2003 		default:
2004 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2005 			break;
2006 		}
2007 
2008 		imsg_free(&imsg);
2009 		if (err)
2010 			break;
2011 	}
2012 
2013 	if (err) {
2014 		int i;
2015 		for (i = 0; i < *nremotes; i++) {
2016 			free((*remotes)[i].name);
2017 			free((*remotes)[i].url);
2018 		}
2019 		free(*remotes);
2020 		*remotes = NULL;
2021 		*nremotes = 0;
2022 	}
2023 	return err;
2024 }
2025 
2026 const struct got_error *
2027 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2028      struct got_object_id *id, int idx, const char *path)
2029 {
2030 	const struct got_error *err = NULL;
2031 	struct ibuf *wbuf;
2032 	size_t path_len = strlen(path) + 1;
2033 
2034 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2035 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2036 	if (wbuf == NULL)
2037 		return got_error_from_errno(
2038 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2039 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2040 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2041 		ibuf_free(wbuf);
2042 		return err;
2043 	}
2044 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
2045 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2046 		ibuf_free(wbuf);
2047 		return err;
2048 	}
2049 	if (imsg_add(wbuf, path, path_len) == -1) {
2050 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2051 		ibuf_free(wbuf);
2052 		return err;
2053 	}
2054 
2055 	wbuf->fd = -1;
2056 	imsg_close(ibuf, wbuf);
2057 
2058 	return flush_imsg(ibuf);
2059 }
2060 
2061 const struct got_error *
2062 got_privsep_send_traversed_commits(struct got_object_id *commit_ids, 
2063     size_t ncommits, struct imsgbuf *ibuf)
2064 {
2065 	const struct got_error *err;
2066 	struct ibuf *wbuf;
2067 	int i;
2068 
2069 	wbuf = imsg_create(ibuf, GOT_IMSG_TRAVERSED_COMMITS, 0, 0,
2070 	    sizeof(struct got_imsg_traversed_commits) +
2071 	    ncommits * SHA1_DIGEST_LENGTH);
2072 	if (wbuf == NULL)
2073 		return got_error_from_errno("imsg_create TRAVERSED_COMMITS");
2074 
2075 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1) {
2076 		err = got_error_from_errno("imsg_add TRAVERSED_COMMITS");
2077 		ibuf_free(wbuf);
2078 		return err;
2079 	}
2080 	for (i = 0; i < ncommits; i++) {
2081 		struct got_object_id *id = &commit_ids[i];
2082 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2083 			err = got_error_from_errno(
2084 			    "imsg_add TRAVERSED_COMMITS");
2085 			ibuf_free(wbuf);
2086 			return err;
2087 		}
2088 	}
2089 
2090 	wbuf->fd = -1;
2091 	imsg_close(ibuf, wbuf);
2092 
2093 	return flush_imsg(ibuf);
2094 }
2095 
2096 const struct got_error *
2097 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2098     struct got_object_id **changed_commit_id,
2099     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2100 {
2101 	const struct got_error *err = NULL;
2102 	struct imsg imsg;
2103 	struct got_imsg_traversed_commits *icommits;
2104 	size_t datalen;
2105 	int i, done = 0;
2106 
2107 	*changed_commit = NULL;
2108 	*changed_commit_id = NULL;
2109 
2110 	while (!done) {
2111 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2112 		if (err)
2113 			return err;
2114 
2115 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2116 		switch (imsg.hdr.type) {
2117 		case GOT_IMSG_TRAVERSED_COMMITS:
2118 			icommits = imsg.data;
2119 			if (datalen != sizeof(*icommits) +
2120 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2121 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2122 				break;
2123 			}
2124 			for (i = 0; i < icommits->ncommits; i++) {
2125 				struct got_object_qid *qid;
2126 				uint8_t *sha1 = (uint8_t *)imsg.data +
2127 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2128 				err = got_object_qid_alloc_partial(&qid);
2129 				if (err)
2130 					break;
2131 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
2132 				SIMPLEQ_INSERT_TAIL(commit_ids, qid, entry);
2133 
2134 				/* The last commit may contain a change. */
2135 				if (i == icommits->ncommits - 1) {
2136 					*changed_commit_id =
2137 					    got_object_id_dup(qid->id);
2138 					if (*changed_commit_id == NULL) {
2139 						err = got_error_from_errno(
2140 						    "got_object_id_dup");
2141 						break;
2142 					}
2143 				}
2144 			}
2145 			break;
2146 		case GOT_IMSG_COMMIT:
2147 			if (*changed_commit_id == NULL) {
2148 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2149 				break;
2150 			}
2151 			err = get_commit_from_imsg(changed_commit, &imsg,
2152 			    datalen, ibuf);
2153 			break;
2154 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2155 			done = 1;
2156 			break;
2157 		default:
2158 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2159 			break;
2160 		}
2161 
2162 		imsg_free(&imsg);
2163 		if (err)
2164 			break;
2165 	}
2166 
2167 	if (err)
2168 		got_object_id_queue_free(commit_ids);
2169 	return err;
2170 }
2171 
2172 const struct got_error *
2173 got_privsep_send_commit_traversal_done(struct imsgbuf *ibuf)
2174 {
2175 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_DONE, 0, 0, -1,
2176 	    NULL, 0) == -1)
2177 		return got_error_from_errno("imsg_compose TRAVERSAL_DONE");
2178 
2179 	return flush_imsg(ibuf);
2180 }
2181 
2182 const struct got_error *
2183 got_privsep_unveil_exec_helpers(void)
2184 {
2185 	const char *helpers[] = {
2186 	    GOT_PATH_PROG_READ_PACK,
2187 	    GOT_PATH_PROG_READ_OBJECT,
2188 	    GOT_PATH_PROG_READ_COMMIT,
2189 	    GOT_PATH_PROG_READ_TREE,
2190 	    GOT_PATH_PROG_READ_BLOB,
2191 	    GOT_PATH_PROG_READ_TAG,
2192 	    GOT_PATH_PROG_READ_GITCONFIG,
2193 	};
2194 	int i;
2195 
2196 	for (i = 0; i < nitems(helpers); i++) {
2197 		if (unveil(helpers[i], "x") == 0)
2198 			continue;
2199 		return got_error_from_errno2("unveil", helpers[i]);
2200 	}
2201 
2202 	return NULL;
2203 }
2204 
2205 void
2206 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
2207 {
2208 	if (close(imsg_fds[0]) != 0) {
2209 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2210 		_exit(1);
2211 	}
2212 
2213 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
2214 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2215 		_exit(1);
2216 	}
2217 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
2218 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2219 		_exit(1);
2220 	}
2221 
2222 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
2223 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
2224 		    strerror(errno));
2225 		_exit(1);
2226 	}
2227 }