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Date:: Thu Mar 19 16:56:51 2020 UTC
Message:: initialize pack file size output paramter of got_privsep_recv_fetch_progress()
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1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  * Copyright (c) 2020 Ori Bernstein <ori@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/syslimits.h>
22 #include <sys/wait.h>
23 
24 #include <ctype.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <stdint.h>
30 #include <poll.h>
31 #include <imsg.h>
32 #include <sha1.h>
33 #include <zlib.h>
34 #include <time.h>
35 
36 #include "got_object.h"
37 #include "got_error.h"
38 #include "got_path.h"
39 #include "got_repository.h"
40 
41 #include "got_lib_sha1.h"
42 #include "got_lib_delta.h"
43 #include "got_lib_inflate.h"
44 #include "got_lib_object.h"
45 #include "got_lib_object_parse.h"
46 #include "got_lib_privsep.h"
47 #include "got_lib_pack.h"
48 
49 #ifndef MIN
50 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
51 #endif
52 
53 #ifndef nitems
54 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
55 #endif
56 
57 static const struct got_error *
58 poll_fd(int fd, int events, int timeout)
59 {
60 	struct pollfd pfd[1];
61 	int n;
62 
63 	pfd[0].fd = fd;
64 	pfd[0].events = events;
65 
66 	n = poll(pfd, 1, timeout);
67 	if (n == -1)
68 		return got_error_from_errno("poll");
69 	if (n == 0)
70 		return got_error(GOT_ERR_TIMEOUT);
71 	if (pfd[0].revents & (POLLERR | POLLNVAL))
72 		return got_error_from_errno("poll error");
73 	if (pfd[0].revents & (events | POLLHUP))
74 		return NULL;
75 
76 	return got_error(GOT_ERR_INTERRUPT);
77 }
78 
79 static const struct got_error *
80 read_imsg(struct imsgbuf *ibuf)
81 {
82 	const struct got_error *err;
83 	size_t n;
84 
85 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
86 	if (err)
87 		return err;
88 
89 	n = imsg_read(ibuf);
90 	if (n == -1) {
91 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
92 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
93 		return got_error(GOT_ERR_PRIVSEP_READ);
94 	}
95 	if (n == 0)
96 		return got_error(GOT_ERR_PRIVSEP_PIPE);
97 
98 	return NULL;
99 }
100 
101 const struct got_error *
102 got_privsep_wait_for_child(pid_t pid)
103 {
104 	int child_status;
105 
106 	if (waitpid(pid, &child_status, 0) == -1)
107 		return got_error_from_errno("waitpid");
108 
109 	if (!WIFEXITED(child_status))
110 		return got_error(GOT_ERR_PRIVSEP_DIED);
111 
112 	if (WEXITSTATUS(child_status) != 0)
113 		return got_error(GOT_ERR_PRIVSEP_EXIT);
114 
115 	return NULL;
116 }
117 
118 static const struct got_error *
119 recv_imsg_error(struct imsg *imsg, size_t datalen)
120 {
121 	struct got_imsg_error *ierr;
122 
123 	if (datalen != sizeof(*ierr))
124 		return got_error(GOT_ERR_PRIVSEP_LEN);
125 
126 	ierr = imsg->data;
127 	if (ierr->code == GOT_ERR_ERRNO) {
128 		static struct got_error serr;
129 		serr.code = GOT_ERR_ERRNO;
130 		serr.msg = strerror(ierr->errno_code);
131 		return &serr;
132 	}
133 
134 	return got_error(ierr->code);
135 }
136 
137 const struct got_error *
138 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
139     size_t min_datalen)
140 {
141 	const struct got_error *err;
142 	ssize_t n;
143 
144 	n = imsg_get(ibuf, imsg);
145 	if (n == -1)
146 		return got_error_from_errno("imsg_get");
147 
148 	while (n == 0) {
149 		err = read_imsg(ibuf);
150 		if (err)
151 			return err;
152 		n = imsg_get(ibuf, imsg);
153 		if (n == -1)
154 			return got_error_from_errno("imsg_get");
155 	}
156 
157 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
158 		return got_error(GOT_ERR_PRIVSEP_LEN);
159 
160 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
161 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
162 		return recv_imsg_error(imsg, datalen);
163 	}
164 
165 	return NULL;
166 }
167 
168 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
169 void
170 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
171 {
172 	const struct got_error *poll_err;
173 	struct got_imsg_error ierr;
174 	int ret;
175 
176 	ierr.code = err->code;
177 	if (err->code == GOT_ERR_ERRNO)
178 		ierr.errno_code = errno;
179 	else
180 		ierr.errno_code = 0;
181 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
182 	if (ret == -1) {
183 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
184 		    getprogname(), err->code, err->msg, strerror(errno));
185 		return;
186 	}
187 
188 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
189 	if (poll_err) {
190 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
191 		    getprogname(), err->code, err->msg, poll_err->msg);
192 		return;
193 	}
194 
195 	ret = imsg_flush(ibuf);
196 	if (ret == -1) {
197 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
198 		    getprogname(), err->code, err->msg, strerror(errno));
199 		return;
200 	}
201 }
202 
203 static const struct got_error *
204 flush_imsg(struct imsgbuf *ibuf)
205 {
206 	const struct got_error *err;
207 
208 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
209 	if (err)
210 		return err;
211 
212 	if (imsg_flush(ibuf) == -1)
213 		return got_error_from_errno("imsg_flush");
214 
215 	return NULL;
216 }
217 
218 const struct got_error *
219 got_privsep_send_stop(int fd)
220 {
221 	const struct got_error *err = NULL;
222 	struct imsgbuf ibuf;
223 
224 	imsg_init(&ibuf, fd);
225 
226 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
227 		return got_error_from_errno("imsg_compose STOP");
228 
229 	err = flush_imsg(&ibuf);
230 	imsg_clear(&ibuf);
231 	return err;
232 }
233 
234 const struct got_error *
235 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd)
236 {
237 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd, NULL, 0)
238 	    == -1)
239 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
240 
241 	return flush_imsg(ibuf);
242 }
243 
244 const struct got_error *
245 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
246     struct got_object_id *id, int pack_idx)
247 {
248 	const struct got_error *err = NULL;
249 	struct got_imsg_packed_object iobj, *iobjp;
250 	size_t len;
251 
252 	if (id) { /* commit is packed */
253 		iobj.idx = pack_idx;
254 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
255 		iobjp = &iobj;
256 		len = sizeof(iobj);
257 	} else {
258 		iobjp = NULL;
259 		len = 0;
260 	}
261 
262 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, iobjp, len)
263 	    == -1) {
264 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
265 		close(fd);
266 		return err;
267 	}
268 
269 	return flush_imsg(ibuf);
270 }
271 
272 const struct got_error *
273 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
274     struct got_object_id *id, int pack_idx)
275 {
276 	const struct got_error *err = NULL;
277 	struct ibuf *wbuf;
278 	size_t len = id ? sizeof(struct got_imsg_packed_object) : 0;
279 
280 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
281 	if (wbuf == NULL)
282 		return got_error_from_errno("imsg_create TREE_REQUEST");
283 
284 	if (id) { /* tree is packed */
285 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
286 			err = got_error_from_errno("imsg_add TREE_ENTRY");
287 			ibuf_free(wbuf);
288 			return err;
289 		}
290 
291 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1) {
292 			err = got_error_from_errno("imsg_add TREE_ENTRY");
293 			ibuf_free(wbuf);
294 			return err;
295 		}
296 	}
297 
298 	wbuf->fd = fd;
299 	imsg_close(ibuf, wbuf);
300 
301 	return flush_imsg(ibuf);
302 }
303 
304 const struct got_error *
305 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
306     struct got_object_id *id, int pack_idx)
307 {
308 	struct got_imsg_packed_object iobj, *iobjp;
309 	size_t len;
310 
311 	if (id) { /* tag is packed */
312 		iobj.idx = pack_idx;
313 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
314 		iobjp = &iobj;
315 		len = sizeof(iobj);
316 	} else {
317 		iobjp = NULL;
318 		len = 0;
319 	}
320 
321 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, iobjp, len)
322 	    == -1)
323 		return got_error_from_errno("imsg_compose TAG_REQUEST");
324 
325 	return flush_imsg(ibuf);
326 }
327 
328 const struct got_error *
329 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
330     struct got_object_id *id, int pack_idx)
331 {
332 	const struct got_error *err = NULL;
333 	struct got_imsg_packed_object iobj, *iobjp;
334 	size_t len;
335 
336 	if (id) { /* blob is packed */
337 		iobj.idx = pack_idx;
338 		memcpy(iobj.id, id->sha1, sizeof(iobj.id));
339 		iobjp = &iobj;
340 		len = sizeof(iobj);
341 	} else {
342 		iobjp = NULL;
343 		len = 0;
344 	}
345 
346 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, iobjp, len)
347 	    == -1) {
348 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
349 		close(infd);
350 		return err;
351 	}
352 
353 	return flush_imsg(ibuf);
354 }
355 
356 const struct got_error *
357 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
358 {
359 	const struct got_error *err = NULL;
360 
361 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
362 	    == -1) {
363 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
364 		close(outfd);
365 		return err;
366 	}
367 
368 	return flush_imsg(ibuf);
369 }
370 
371 static const struct got_error *
372 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
373 {
374 	const struct got_error *err = NULL;
375 
376 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
377 		err = got_error_from_errno("imsg_compose TMPFD");
378 		close(fd);
379 		return err;
380 	}
381 
382 	return flush_imsg(ibuf);
383 }
384 
385 const struct got_error *
386 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
387 {
388 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
389 }
390 
391 const struct got_error *
392 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
393 {
394 	struct got_imsg_object iobj;
395 
396 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
397 	iobj.type = obj->type;
398 	iobj.flags = obj->flags;
399 	iobj.hdrlen = obj->hdrlen;
400 	iobj.size = obj->size;
401 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
402 		iobj.pack_offset = obj->pack_offset;
403 		iobj.pack_idx = obj->pack_idx;
404 	}
405 
406 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
407 	    == -1)
408 		return got_error_from_errno("imsg_compose OBJECT");
409 
410 	return flush_imsg(ibuf);
411 }
412 
413 const struct got_error *
414 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
415    struct got_pathlist_head *have_refs)
416 {
417 	const struct got_error *err = NULL;
418 	struct ibuf *wbuf;
419 	size_t len, n_have_refs = 0;
420 	struct got_pathlist_entry *pe;
421 
422 	len = sizeof(struct got_imsg_fetch_symrefs);
423 	TAILQ_FOREACH(pe, have_refs, entry) {
424 		struct got_object_id *id = pe->data;
425 		len += sizeof(struct got_imsg_fetch_have_ref) +
426 		    pe->path_len + sizeof(id->sha1);
427 		n_have_refs++;
428 	}
429 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
430 		close(fd);
431 		return got_error(GOT_ERR_NO_SPACE);
432 	}
433 
434 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
435 	if (wbuf == NULL) {
436 		close(fd);
437 		return got_error_from_errno("imsg_create FETCH_REQUEST");
438 	}
439 
440 	/* Keep in sync with struct got_imsg_fetch_have_refs definition! */
441 	if (imsg_add(wbuf, &n_have_refs, sizeof(n_have_refs)) == -1) {
442 		err = got_error_from_errno("imsg_add FETCH_REQUEST");
443 		ibuf_free(wbuf);
444 		close(fd);
445 		return err;
446 	}
447 
448 	TAILQ_FOREACH(pe, have_refs, entry) {
449 		const char *name = pe->path;
450 		size_t name_len = pe->path_len;
451 		struct got_object_id *id = pe->data;
452 
453 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
454 		if (imsg_add(wbuf, id->sha1, sizeof(id->sha1)) == -1) {
455 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
456 			ibuf_free(wbuf);
457 			close(fd);
458 			return err;
459 		}
460 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
461 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
462 			ibuf_free(wbuf);
463 			close(fd);
464 			return err;
465 		}
466 		if (imsg_add(wbuf, name, name_len) == -1) {
467 			err = got_error_from_errno("imsg_add FETCH_REQUEST");
468 			ibuf_free(wbuf);
469 			close(fd);
470 			return err;
471 		}
472 	}
473 
474 	wbuf->fd = fd;
475 	imsg_close(ibuf, wbuf);
476 	return flush_imsg(ibuf);
477 }
478 
479 const struct got_error *
480 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
481 {
482 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
483 }
484 
485 
486 const struct got_error *
487 got_privsep_send_fetch_symrefs(struct imsgbuf *ibuf,
488     struct got_pathlist_head *symrefs)
489 {
490 	const struct got_error *err = NULL;
491 	struct ibuf *wbuf;
492 	size_t len, nsymrefs = 0;
493 	struct got_pathlist_entry *pe;
494 
495 	len = sizeof(struct got_imsg_fetch_symrefs);
496 	TAILQ_FOREACH(pe, symrefs, entry) {
497 		const char *target = pe->data;
498 		len += sizeof(struct got_imsg_fetch_symref) +
499 		    pe->path_len + strlen(target);
500 		nsymrefs++;
501 	}
502 
503 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
504 		return got_error(GOT_ERR_NO_SPACE);
505 
506 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_SYMREFS, 0, 0, len);
507 	if (wbuf == NULL)
508 		return got_error_from_errno("imsg_create FETCH_SYMREFS");
509 
510 	/* Keep in sync with struct got_imsg_fetch_symrefs definition! */
511 	if (imsg_add(wbuf, &nsymrefs, sizeof(nsymrefs)) == -1) {
512 		err = got_error_from_errno("imsg_add FETCH_SYMREFS");
513 		ibuf_free(wbuf);
514 		return err;
515 	}
516 
517 	TAILQ_FOREACH(pe, symrefs, entry) {
518 		const char *name = pe->path;
519 		size_t name_len = pe->path_len;
520 		const char *target = pe->data;
521 		size_t target_len = strlen(target);
522 
523 		/* Keep in sync with struct got_imsg_fetch_symref definition! */
524 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1) {
525 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
526 			ibuf_free(wbuf);
527 			return err;
528 		}
529 		if (imsg_add(wbuf, &target_len, sizeof(target_len)) == -1) {
530 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
531 			ibuf_free(wbuf);
532 			return err;
533 		}
534 		if (imsg_add(wbuf, name, name_len) == -1) {
535 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
536 			ibuf_free(wbuf);
537 			return err;
538 		}
539 		if (imsg_add(wbuf, target, target_len) == -1) {
540 			err = got_error_from_errno("imsg_add FETCH_SYMREFS");
541 			ibuf_free(wbuf);
542 			return err;
543 		}
544 	}
545 
546 	wbuf->fd = -1;
547 	imsg_close(ibuf, wbuf);
548 	return flush_imsg(ibuf);
549 }
550 
551 const struct got_error *
552 got_privsep_send_fetch_ref(struct imsgbuf *ibuf,
553     struct got_object_id *refid, const char *refname)
554 {
555 	const struct got_error *err = NULL;
556 	struct ibuf *wbuf;
557 	size_t len, reflen = strlen(refname);
558 
559 	len = sizeof(struct got_imsg_fetch_ref) + reflen;
560 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
561 		return got_error(GOT_ERR_NO_SPACE);
562 
563 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REF, 0, 0, len);
564 	if (wbuf == NULL)
565 		return got_error_from_errno("imsg_create FETCH_REF");
566 
567 	/* Keep in sync with struct got_imsg_fetch_ref definition! */
568 	if (imsg_add(wbuf, refid->sha1, SHA1_DIGEST_LENGTH) == -1) {
569 		err = got_error_from_errno("imsg_add FETCH_REF");
570 		ibuf_free(wbuf);
571 		return err;
572 	}
573 	if (imsg_add(wbuf, refname, reflen) == -1) {
574 		err = got_error_from_errno("imsg_add FETCH_REF");
575 		ibuf_free(wbuf);
576 		return err;
577 	}
578 
579 	wbuf->fd = -1;
580 	imsg_close(ibuf, wbuf);
581 	return flush_imsg(ibuf);
582 }
583 
584 const struct got_error *
585 got_privsep_send_fetch_server_progress(struct imsgbuf *ibuf, const char *msg,
586     size_t msglen)
587 {
588 	if (msglen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
589 		return got_error(GOT_ERR_NO_SPACE);
590 
591 	if (msglen == 0)
592 		return NULL;
593 
594 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_SERVER_PROGRESS, 0, 0, -1,
595 	    msg, msglen) == -1)
596 		return got_error_from_errno(
597 		    "imsg_compose FETCH_SERVER_PROGRESS");
598 
599 	return flush_imsg(ibuf);
600 }
601 
602 const struct got_error *
603 got_privsep_send_fetch_download_progress(struct imsgbuf *ibuf, off_t bytes)
604 {
605 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DOWNLOAD_PROGRESS, 0, 0, -1,
606 	    &bytes, sizeof(bytes)) == -1)
607 		return got_error_from_errno(
608 		    "imsg_compose FETCH_DOWNLOAD_PROGRESS");
609 
610 	return flush_imsg(ibuf);
611 }
612 
613 const struct got_error *
614 got_privsep_send_fetch_done(struct imsgbuf *ibuf, struct got_object_id hash)
615 {
616 	if (imsg_compose(ibuf, GOT_IMSG_FETCH_DONE, 0, 0, -1,
617 	    hash.sha1, SHA1_DIGEST_LENGTH) == -1)
618 		return got_error_from_errno("imsg_compose FETCH");
619 	return flush_imsg(ibuf);
620 }
621 
622 
623 const struct got_error *
624 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
625     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
626     off_t *packfile_size, struct imsgbuf *ibuf)
627 {
628 	const struct got_error *err = NULL;
629 	struct imsg imsg;
630 	size_t datalen;
631 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
632 	size_t n, remain;
633 	off_t off;
634 	int i;
635 
636 	*done = 0;
637 	*id = NULL;
638 	*refname = NULL;
639 	*server_progress = NULL;
640 	*packfile_size = 0;
641 
642 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
643 	if (err)
644 		return err;
645 
646 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
647 	switch (imsg.hdr.type) {
648 	case GOT_IMSG_ERROR:
649 		if (datalen < sizeof(struct got_imsg_error)) {
650 			err = got_error(GOT_ERR_PRIVSEP_LEN);
651 			break;
652 		}
653 		err = recv_imsg_error(&imsg, datalen);
654 		break;
655 	case GOT_IMSG_FETCH_SYMREFS:
656 		if (datalen < sizeof(*isymrefs)) {
657 			err = got_error(GOT_ERR_PRIVSEP_LEN);
658 			break;
659 		}
660 		if (isymrefs != NULL) {
661 			err = got_error(GOT_ERR_PRIVSEP_MSG);
662 			break;
663 		}
664 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
665 		off = sizeof(*isymrefs);
666 		remain = datalen - off;
667 		for (n = 0; n < isymrefs->nsymrefs; n++) {
668 			struct got_imsg_fetch_symref *s;
669 			char *name, *target;
670 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
671 				err = got_error(GOT_ERR_PRIVSEP_LEN);
672 				goto done;
673 			}
674 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
675 			off += sizeof(*s);
676 			remain -= sizeof(*s);
677 			if (remain < s->name_len) {
678 				err = got_error(GOT_ERR_PRIVSEP_LEN);
679 				goto done;
680 			}
681 			name = strndup(imsg.data + off, s->name_len);
682 			if (name == NULL) {
683 				err = got_error_from_errno("strndup");
684 				goto done;
685 			}
686 			off += s->name_len;
687 			remain -= s->name_len;
688 			if (remain < s->target_len) {
689 				err = got_error(GOT_ERR_PRIVSEP_LEN);
690 				free(name);
691 				goto done;
692 			}
693 			target = strndup(imsg.data + off, s->target_len);
694 			if (target == NULL) {
695 				err = got_error_from_errno("strndup");
696 				free(name);
697 				goto done;
698 			}
699 			off += s->target_len;
700 			remain -= s->target_len;
701 			err = got_pathlist_append(symrefs, name, target);
702 			if (err) {
703 				free(name);
704 				free(target);
705 				goto done;
706 			}
707 		}
708 		break;
709 	case GOT_IMSG_FETCH_REF:
710 		if (datalen <= SHA1_DIGEST_LENGTH) {
711 			err = got_error(GOT_ERR_PRIVSEP_MSG);
712 			break;
713 		}
714 		*id = malloc(sizeof(**id));
715 		if (*id == NULL) {
716 			err = got_error_from_errno("malloc");
717 			break;
718 		}
719 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
720 		*refname = strndup(imsg.data + SHA1_DIGEST_LENGTH,
721 		    datalen - SHA1_DIGEST_LENGTH);
722 		if (*refname == NULL) {
723 			err = got_error_from_errno("strndup");
724 			break;
725 		}
726 		break;
727 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
728 		if (datalen == 0) {
729 			err = got_error(GOT_ERR_PRIVSEP_LEN);
730 			break;
731 		}
732 		*server_progress = strndup(imsg.data, datalen);
733 		if (*server_progress == NULL) {
734 			err = got_error_from_errno("strndup");
735 			break;
736 		}
737 		for (i = 0; i < datalen; i++) {
738 			if (!isprint((unsigned char)(*server_progress)[i]) &&
739 			    !isspace((unsigned char)(*server_progress)[i])) {
740 				err = got_error(GOT_ERR_PRIVSEP_MSG);
741 				free(*server_progress);
742 				*server_progress = NULL;
743 				goto done;
744 			}
745 		}
746 		break;
747 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
748 		if (datalen < sizeof(*packfile_size)) {
749 			err = got_error(GOT_ERR_PRIVSEP_MSG);
750 			break;
751 		}
752 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
753 		break;
754 	case GOT_IMSG_FETCH_DONE:
755 		*id = malloc(sizeof(**id));
756 		if (*id == NULL) {
757 			err = got_error_from_errno("malloc");
758 			break;
759 		}
760 		if (datalen != SHA1_DIGEST_LENGTH) {
761 			err = got_error(GOT_ERR_PRIVSEP_MSG);
762 			break;
763 		}
764 		memcpy((*id)->sha1, imsg.data, SHA1_DIGEST_LENGTH);
765 		*done = 1;
766 		break;
767 	default:
768 		err = got_error(GOT_ERR_PRIVSEP_MSG);
769 		break;
770 	}
771 done:
772 	if (err) {
773 		free(*id);
774 		*id = NULL;
775 		free(*refname);
776 		*refname = NULL;
777 	}
778 	imsg_free(&imsg);
779 	return err;
780 }
781 
782 const struct got_error *
783 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_hash,
784     int fd)
785 {
786 	const struct got_error *err = NULL;
787 
788 	/* Keep in sync with struct got_imsg_index_pack_request */
789 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
790 	    pack_hash, SHA1_DIGEST_LENGTH) == -1) {
791 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
792 		close(fd);
793 		return err;
794 	}
795 	return flush_imsg(ibuf);
796 }
797 
798 const struct got_error *
799 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
800 {
801 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
802 }
803 
804 const struct got_error *
805 got_privsep_send_index_pack_progress(struct imsgbuf *ibuf, int nobj_total,
806     int nobj_indexed, int nobj_loose, int nobj_resolved)
807 {
808 	struct got_imsg_index_pack_progress iprogress;
809 
810 	iprogress.nobj_total = nobj_total;
811 	iprogress.nobj_indexed = nobj_indexed;
812 	iprogress.nobj_loose = nobj_loose;
813 	iprogress.nobj_resolved = nobj_resolved;
814 
815 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_PROGRESS, 0, 0, -1,
816 	    &iprogress, sizeof(iprogress)) == -1)
817 		return got_error_from_errno("imsg_compose IDXPACK_PROGRESS");
818 
819 	return flush_imsg(ibuf);
820 }
821 
822 const struct got_error *
823 got_privsep_send_index_pack_done(struct imsgbuf *ibuf)
824 {
825 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_DONE, 0, 0, -1, NULL, 0) == -1)
826 		return got_error_from_errno("imsg_compose FETCH");
827 	return flush_imsg(ibuf);
828 }
829 
830 const struct got_error *
831 got_privsep_recv_index_progress(int *done, int *nobj_total,
832     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
833     struct imsgbuf *ibuf)
834 {
835 	const struct got_error *err = NULL;
836 	struct imsg imsg;
837 	struct got_imsg_index_pack_progress *iprogress;
838 	size_t datalen;
839 
840 	*done = 0;
841 	*nobj_total = 0;
842 	*nobj_indexed = 0;
843 	*nobj_resolved = 0;
844 
845 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
846 	if (err)
847 		return err;
848 
849 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
850 	switch (imsg.hdr.type) {
851 	case GOT_IMSG_ERROR:
852 		if (datalen < sizeof(struct got_imsg_error)) {
853 			err = got_error(GOT_ERR_PRIVSEP_LEN);
854 			break;
855 		}
856 		err = recv_imsg_error(&imsg, datalen);
857 		break;
858 	case GOT_IMSG_IDXPACK_PROGRESS:
859 		if (datalen < sizeof(*iprogress)) {
860 			err = got_error(GOT_ERR_PRIVSEP_LEN);
861 			break;
862 		}
863 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
864 		*nobj_total = iprogress->nobj_total;
865 		*nobj_indexed = iprogress->nobj_indexed;
866 		*nobj_loose = iprogress->nobj_loose;
867 		*nobj_resolved = iprogress->nobj_resolved;
868 		break;
869 	case GOT_IMSG_IDXPACK_DONE:
870 		if (datalen != 0) {
871 			err = got_error(GOT_ERR_PRIVSEP_LEN);
872 			break;
873 		}
874 		*done = 1;
875 		break;
876 	default:
877 		err = got_error(GOT_ERR_PRIVSEP_MSG);
878 		break;
879 	}
880 
881 	imsg_free(&imsg);
882 	return err;
883 }
884 
885 const struct got_error *
886 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
887     struct imsgbuf *ibuf)
888 {
889 	const struct got_error *err = NULL;
890 	struct got_imsg_object *iobj;
891 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
892 
893 	if (datalen != sizeof(*iobj))
894 		return got_error(GOT_ERR_PRIVSEP_LEN);
895 	iobj = imsg->data;
896 
897 	*obj = calloc(1, sizeof(**obj));
898 	if (*obj == NULL)
899 		return got_error_from_errno("calloc");
900 
901 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
902 	(*obj)->type = iobj->type;
903 	(*obj)->flags = iobj->flags;
904 	(*obj)->hdrlen = iobj->hdrlen;
905 	(*obj)->size = iobj->size;
906 	/* path_packfile is handled by caller */
907 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
908 		(*obj)->pack_offset = iobj->pack_offset;
909 		(*obj)->pack_idx = iobj->pack_idx;
910 	}
911 
912 	return err;
913 }
914 
915 const struct got_error *
916 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
917 {
918 	const struct got_error *err = NULL;
919 	struct imsg imsg;
920 	const size_t min_datalen =
921 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
922 
923 	*obj = NULL;
924 
925 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
926 	if (err)
927 		return err;
928 
929 	switch (imsg.hdr.type) {
930 	case GOT_IMSG_OBJECT:
931 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
932 		break;
933 	default:
934 		err = got_error(GOT_ERR_PRIVSEP_MSG);
935 		break;
936 	}
937 
938 	imsg_free(&imsg);
939 
940 	return err;
941 }
942 
943 static const struct got_error *
944 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
945     size_t logmsg_len)
946 {
947 	const struct got_error *err = NULL;
948 	size_t offset, remain;
949 
950 	offset = 0;
951 	remain = logmsg_len;
952 	while (remain > 0) {
953 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
954 
955 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
956 		    commit->logmsg + offset, n) == -1) {
957 			err = got_error_from_errno("imsg_compose "
958 			    "COMMIT_LOGMSG");
959 			break;
960 		}
961 
962 		err = flush_imsg(ibuf);
963 		if (err)
964 			break;
965 
966 		offset += n;
967 		remain -= n;
968 	}
969 
970 	return err;
971 }
972 
973 const struct got_error *
974 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
975 {
976 	const struct got_error *err = NULL;
977 	struct got_imsg_commit_object *icommit;
978 	uint8_t *buf;
979 	size_t len, total;
980 	struct got_object_qid *qid;
981 	size_t author_len = strlen(commit->author);
982 	size_t committer_len = strlen(commit->committer);
983 	size_t logmsg_len = strlen(commit->logmsg);
984 
985 	total = sizeof(*icommit) + author_len + committer_len +
986 	    commit->nparents * SHA1_DIGEST_LENGTH;
987 
988 	buf = malloc(total);
989 	if (buf == NULL)
990 		return got_error_from_errno("malloc");
991 
992 	icommit = (struct got_imsg_commit_object *)buf;
993 	memcpy(icommit->tree_id, commit->tree_id->sha1,
994 	    sizeof(icommit->tree_id));
995 	icommit->author_len = author_len;
996 	icommit->author_time = commit->author_time;
997 	icommit->author_gmtoff = commit->author_gmtoff;
998 	icommit->committer_len = committer_len;
999 	icommit->committer_time = commit->committer_time;
1000 	icommit->committer_gmtoff = commit->committer_gmtoff;
1001 	icommit->logmsg_len = logmsg_len;
1002 	icommit->nparents = commit->nparents;
1003 
1004 	len = sizeof(*icommit);
1005 	memcpy(buf + len, commit->author, author_len);
1006 	len += author_len;
1007 	memcpy(buf + len, commit->committer, committer_len);
1008 	len += committer_len;
1009 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
1010 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
1011 		len += SHA1_DIGEST_LENGTH;
1012 	}
1013 
1014 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1015 		err = got_error_from_errno("imsg_compose COMMIT");
1016 		goto done;
1017 	}
1018 
1019 	if (logmsg_len == 0 ||
1020 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1021 		err = flush_imsg(ibuf);
1022 		if (err)
1023 			goto done;
1024 	}
1025 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1026 done:
1027 	free(buf);
1028 	return err;
1029 }
1030 
1031 static const struct got_error *
1032 get_commit_from_imsg(struct got_commit_object **commit,
1033     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1034 {
1035 	const struct got_error *err = NULL;
1036 	struct got_imsg_commit_object *icommit;
1037 	size_t len = 0;
1038 	int i;
1039 
1040 	if (datalen < sizeof(*icommit))
1041 		return got_error(GOT_ERR_PRIVSEP_LEN);
1042 
1043 	icommit = imsg->data;
1044 	if (datalen != sizeof(*icommit) + icommit->author_len +
1045 	    icommit->committer_len +
1046 	    icommit->nparents * SHA1_DIGEST_LENGTH)
1047 		return got_error(GOT_ERR_PRIVSEP_LEN);
1048 
1049 	if (icommit->nparents < 0)
1050 		return got_error(GOT_ERR_PRIVSEP_LEN);
1051 
1052 	len += sizeof(*icommit);
1053 
1054 	*commit = got_object_commit_alloc_partial();
1055 	if (*commit == NULL)
1056 		return got_error_from_errno(
1057 		    "got_object_commit_alloc_partial");
1058 
1059 	memcpy((*commit)->tree_id->sha1, icommit->tree_id,
1060 	    SHA1_DIGEST_LENGTH);
1061 	(*commit)->author_time = icommit->author_time;
1062 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1063 	(*commit)->committer_time = icommit->committer_time;
1064 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1065 
1066 	if (icommit->author_len == 0) {
1067 		(*commit)->author = strdup("");
1068 		if ((*commit)->author == NULL) {
1069 			err = got_error_from_errno("strdup");
1070 			goto done;
1071 		}
1072 	} else {
1073 		(*commit)->author = malloc(icommit->author_len + 1);
1074 		if ((*commit)->author == NULL) {
1075 			err = got_error_from_errno("malloc");
1076 			goto done;
1077 		}
1078 		memcpy((*commit)->author, imsg->data + len,
1079 		    icommit->author_len);
1080 		(*commit)->author[icommit->author_len] = '\0';
1081 	}
1082 	len += icommit->author_len;
1083 
1084 	if (icommit->committer_len == 0) {
1085 		(*commit)->committer = strdup("");
1086 		if ((*commit)->committer == NULL) {
1087 			err = got_error_from_errno("strdup");
1088 			goto done;
1089 		}
1090 	} else {
1091 		(*commit)->committer =
1092 		    malloc(icommit->committer_len + 1);
1093 		if ((*commit)->committer == NULL) {
1094 			err = got_error_from_errno("malloc");
1095 			goto done;
1096 		}
1097 		memcpy((*commit)->committer, imsg->data + len,
1098 		    icommit->committer_len);
1099 		(*commit)->committer[icommit->committer_len] = '\0';
1100 	}
1101 	len += icommit->committer_len;
1102 
1103 	if (icommit->logmsg_len == 0) {
1104 		(*commit)->logmsg = strdup("");
1105 		if ((*commit)->logmsg == NULL) {
1106 			err = got_error_from_errno("strdup");
1107 			goto done;
1108 		}
1109 	} else {
1110 		size_t offset = 0, remain = icommit->logmsg_len;
1111 
1112 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1113 		if ((*commit)->logmsg == NULL) {
1114 			err = got_error_from_errno("malloc");
1115 			goto done;
1116 		}
1117 		while (remain > 0) {
1118 			struct imsg imsg_log;
1119 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1120 			    remain);
1121 
1122 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1123 			if (err)
1124 				goto done;
1125 
1126 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1127 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1128 				goto done;
1129 			}
1130 
1131 			memcpy((*commit)->logmsg + offset,
1132 			    imsg_log.data, n);
1133 			imsg_free(&imsg_log);
1134 			offset += n;
1135 			remain -= n;
1136 		}
1137 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1138 	}
1139 
1140 	for (i = 0; i < icommit->nparents; i++) {
1141 		struct got_object_qid *qid;
1142 
1143 		err = got_object_qid_alloc_partial(&qid);
1144 		if (err)
1145 			break;
1146 		memcpy(qid->id, imsg->data + len +
1147 		    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
1148 		SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1149 		(*commit)->nparents++;
1150 	}
1151 done:
1152 	if (err) {
1153 		got_object_commit_close(*commit);
1154 		*commit = NULL;
1155 	}
1156 	return err;
1157 }
1158 
1159 const struct got_error *
1160 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1161 {
1162 	const struct got_error *err = NULL;
1163 	struct imsg imsg;
1164 	size_t datalen;
1165 	const size_t min_datalen =
1166 	    MIN(sizeof(struct got_imsg_error),
1167 	    sizeof(struct got_imsg_commit_object));
1168 
1169 	*commit = NULL;
1170 
1171 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1172 	if (err)
1173 		return err;
1174 
1175 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1176 
1177 	switch (imsg.hdr.type) {
1178 	case GOT_IMSG_COMMIT:
1179 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1180 		break;
1181 	default:
1182 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1183 		break;
1184 	}
1185 
1186 	imsg_free(&imsg);
1187 
1188 	return err;
1189 }
1190 
1191 const struct got_error *
1192 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_pathlist_head *entries,
1193     int nentries)
1194 {
1195 	const struct got_error *err = NULL;
1196 	struct got_imsg_tree_object itree;
1197 	struct got_pathlist_entry *pe;
1198 	size_t totlen;
1199 	int nimsg; /* number of imsg queued in ibuf */
1200 
1201 	itree.nentries = nentries;
1202 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1203 	    == -1)
1204 		return got_error_from_errno("imsg_compose TREE");
1205 
1206 	totlen = sizeof(itree);
1207 	nimsg = 1;
1208 	TAILQ_FOREACH(pe, entries, entry) {
1209 		const char *name = pe->path;
1210 		struct got_parsed_tree_entry *pte = pe->data;
1211 		struct ibuf *wbuf;
1212 		size_t namelen = strlen(name);
1213 		size_t len = sizeof(struct got_imsg_tree_entry) + namelen;
1214 
1215 		if (len > MAX_IMSGSIZE)
1216 			return got_error(GOT_ERR_NO_SPACE);
1217 
1218 		nimsg++;
1219 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
1220 			err = flush_imsg(ibuf);
1221 			if (err)
1222 				return err;
1223 			nimsg = 0;
1224 		}
1225 
1226 		wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, len);
1227 		if (wbuf == NULL)
1228 			return got_error_from_errno("imsg_create TREE_ENTRY");
1229 
1230 		/* Keep in sync with struct got_imsg_tree_object definition! */
1231 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1) {
1232 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1233 			ibuf_free(wbuf);
1234 			return err;
1235 		}
1236 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1) {
1237 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1238 			ibuf_free(wbuf);
1239 			return err;
1240 		}
1241 
1242 		if (imsg_add(wbuf, name, namelen) == -1) {
1243 			err = got_error_from_errno("imsg_add TREE_ENTRY");
1244 			ibuf_free(wbuf);
1245 			return err;
1246 		}
1247 
1248 		wbuf->fd = -1;
1249 		imsg_close(ibuf, wbuf);
1250 
1251 		totlen += len;
1252 	}
1253 
1254 	return flush_imsg(ibuf);
1255 }
1256 
1257 const struct got_error *
1258 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1259 {
1260 	const struct got_error *err = NULL;
1261 	const size_t min_datalen =
1262 	    MIN(sizeof(struct got_imsg_error),
1263 	    sizeof(struct got_imsg_tree_object));
1264 	struct got_imsg_tree_object *itree;
1265 	int nentries = 0;
1266 
1267 	*tree = NULL;
1268 get_more:
1269 	err = read_imsg(ibuf);
1270 	if (err)
1271 		goto done;
1272 
1273 	for (;;) {
1274 		struct imsg imsg;
1275 		size_t n;
1276 		size_t datalen;
1277 		struct got_imsg_tree_entry *ite;
1278 		struct got_tree_entry *te = NULL;
1279 
1280 		n = imsg_get(ibuf, &imsg);
1281 		if (n == 0) {
1282 			if (*tree && (*tree)->nentries != nentries)
1283 				goto get_more;
1284 			break;
1285 		}
1286 
1287 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
1288 			return got_error(GOT_ERR_PRIVSEP_LEN);
1289 
1290 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1291 
1292 		switch (imsg.hdr.type) {
1293 		case GOT_IMSG_ERROR:
1294 			err = recv_imsg_error(&imsg, datalen);
1295 			break;
1296 		case GOT_IMSG_TREE:
1297 			/* This message should only appear once. */
1298 			if (*tree != NULL) {
1299 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1300 				break;
1301 			}
1302 			if (datalen != sizeof(*itree)) {
1303 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1304 				break;
1305 			}
1306 			itree = imsg.data;
1307 			*tree = malloc(sizeof(**tree));
1308 			if (*tree == NULL) {
1309 				err = got_error_from_errno("malloc");
1310 				break;
1311 			}
1312 			(*tree)->entries = calloc(itree->nentries,
1313 			    sizeof(struct got_tree_entry));
1314 			if ((*tree)->entries == NULL) {
1315 				err = got_error_from_errno("malloc");
1316 				break;
1317 			}
1318 			(*tree)->nentries = itree->nentries;
1319 			(*tree)->refcnt = 0;
1320 			break;
1321 		case GOT_IMSG_TREE_ENTRY:
1322 			/* This message should be preceeded by GOT_IMSG_TREE. */
1323 			if (*tree == NULL) {
1324 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1325 				break;
1326 			}
1327 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
1328 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1329 				break;
1330 			}
1331 
1332 			/* Remaining data contains the entry's name. */
1333 			datalen -= sizeof(*ite);
1334 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
1335 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1336 				break;
1337 			}
1338 			ite = imsg.data;
1339 
1340 			if (datalen + 1 > sizeof(te->name)) {
1341 				err = got_error(GOT_ERR_NO_SPACE);
1342 				break;
1343 			}
1344 			te = &(*tree)->entries[nentries];
1345 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
1346 			te->name[datalen] = '\0';
1347 
1348 			memcpy(te->id.sha1, ite->id, SHA1_DIGEST_LENGTH);
1349 			te->mode = ite->mode;
1350 			te->idx = nentries;
1351 			nentries++;
1352 			break;
1353 		default:
1354 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1355 			break;
1356 		}
1357 
1358 		imsg_free(&imsg);
1359 	}
1360 done:
1361 	if (*tree && (*tree)->nentries != nentries) {
1362 		if (err == NULL)
1363 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1364 		got_object_tree_close(*tree);
1365 		*tree = NULL;
1366 	}
1367 
1368 	return err;
1369 }
1370 
1371 const struct got_error *
1372 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1373     const uint8_t *data)
1374 {
1375 	struct got_imsg_blob iblob;
1376 
1377 	iblob.size = size;
1378 	iblob.hdrlen = hdrlen;
1379 
1380 	if (data) {
1381 		uint8_t *buf;
1382 
1383 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1384 			return got_error(GOT_ERR_NO_SPACE);
1385 
1386 		buf = malloc(sizeof(iblob) + size);
1387 		if (buf == NULL)
1388 			return got_error_from_errno("malloc");
1389 
1390 		memcpy(buf, &iblob, sizeof(iblob));
1391 		memcpy(buf + sizeof(iblob), data, size);
1392 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1393 		   sizeof(iblob) + size) == -1) {
1394 			free(buf);
1395 			return got_error_from_errno("imsg_compose BLOB");
1396 		}
1397 		free(buf);
1398 	} else {
1399 		/* Data has already been written to file descriptor. */
1400 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1401 		    sizeof(iblob)) == -1)
1402 			return got_error_from_errno("imsg_compose BLOB");
1403 	}
1404 
1405 
1406 	return flush_imsg(ibuf);
1407 }
1408 
1409 const struct got_error *
1410 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1411     struct imsgbuf *ibuf)
1412 {
1413 	const struct got_error *err = NULL;
1414 	struct imsg imsg;
1415 	struct got_imsg_blob *iblob;
1416 	size_t datalen;
1417 
1418 	*outbuf = NULL;
1419 
1420 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1421 	if (err)
1422 		return err;
1423 
1424 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1425 
1426 	switch (imsg.hdr.type) {
1427 	case GOT_IMSG_BLOB:
1428 		if (datalen < sizeof(*iblob)) {
1429 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1430 			break;
1431 		}
1432 		iblob = imsg.data;
1433 		*size = iblob->size;
1434 		*hdrlen = iblob->hdrlen;
1435 
1436 		if (datalen == sizeof(*iblob)) {
1437 			/* Data has been written to file descriptor. */
1438 			break;
1439 		}
1440 
1441 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
1442 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1443 			break;
1444 		}
1445 
1446 		*outbuf = malloc(*size);
1447 		if (*outbuf == NULL) {
1448 			err = got_error_from_errno("malloc");
1449 			break;
1450 		}
1451 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1452 		break;
1453 	default:
1454 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1455 		break;
1456 	}
1457 
1458 	imsg_free(&imsg);
1459 
1460 	return err;
1461 }
1462 
1463 static const struct got_error *
1464 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1465 {
1466 	const struct got_error *err = NULL;
1467 	size_t offset, remain;
1468 
1469 	offset = 0;
1470 	remain = tagmsg_len;
1471 	while (remain > 0) {
1472 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1473 
1474 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1475 		    tag->tagmsg + offset, n) == -1) {
1476 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1477 			break;
1478 		}
1479 
1480 		err = flush_imsg(ibuf);
1481 		if (err)
1482 			break;
1483 
1484 		offset += n;
1485 		remain -= n;
1486 	}
1487 
1488 	return err;
1489 }
1490 
1491 const struct got_error *
1492 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1493 {
1494 	const struct got_error *err = NULL;
1495 	struct got_imsg_tag_object *itag;
1496 	uint8_t *buf;
1497 	size_t len, total;
1498 	size_t tag_len = strlen(tag->tag);
1499 	size_t tagger_len = strlen(tag->tagger);
1500 	size_t tagmsg_len = strlen(tag->tagmsg);
1501 
1502 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1503 
1504 	buf = malloc(total);
1505 	if (buf == NULL)
1506 		return got_error_from_errno("malloc");
1507 
1508 	itag = (struct got_imsg_tag_object *)buf;
1509 	memcpy(itag->id, tag->id.sha1, sizeof(itag->id));
1510 	itag->obj_type = tag->obj_type;
1511 	itag->tag_len = tag_len;
1512 	itag->tagger_len = tagger_len;
1513 	itag->tagger_time = tag->tagger_time;
1514 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1515 	itag->tagmsg_len = tagmsg_len;
1516 
1517 	len = sizeof(*itag);
1518 	memcpy(buf + len, tag->tag, tag_len);
1519 	len += tag_len;
1520 	memcpy(buf + len, tag->tagger, tagger_len);
1521 	len += tagger_len;
1522 
1523 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1524 		err = got_error_from_errno("imsg_compose TAG");
1525 		goto done;
1526 	}
1527 
1528 	if (tagmsg_len == 0 ||
1529 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1530 		err = flush_imsg(ibuf);
1531 		if (err)
1532 			goto done;
1533 	}
1534 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1535 done:
1536 	free(buf);
1537 	return err;
1538 }
1539 
1540 const struct got_error *
1541 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1542 {
1543 	const struct got_error *err = NULL;
1544 	struct imsg imsg;
1545 	struct got_imsg_tag_object *itag;
1546 	size_t len, datalen;
1547 	const size_t min_datalen =
1548 	    MIN(sizeof(struct got_imsg_error),
1549 	    sizeof(struct got_imsg_tag_object));
1550 
1551 	*tag = NULL;
1552 
1553 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1554 	if (err)
1555 		return err;
1556 
1557 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1558 	len = 0;
1559 
1560 	switch (imsg.hdr.type) {
1561 	case GOT_IMSG_TAG:
1562 		if (datalen < sizeof(*itag)) {
1563 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1564 			break;
1565 		}
1566 		itag = imsg.data;
1567 		if (datalen != sizeof(*itag) + itag->tag_len +
1568 		    itag->tagger_len) {
1569 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1570 			break;
1571 		}
1572 		len += sizeof(*itag);
1573 
1574 		*tag = calloc(1, sizeof(**tag));
1575 		if (*tag == NULL) {
1576 			err = got_error_from_errno("calloc");
1577 			break;
1578 		}
1579 
1580 		memcpy((*tag)->id.sha1, itag->id, SHA1_DIGEST_LENGTH);
1581 
1582 		if (itag->tag_len == 0) {
1583 			(*tag)->tag = strdup("");
1584 			if ((*tag)->tag == NULL) {
1585 				err = got_error_from_errno("strdup");
1586 				break;
1587 			}
1588 		} else {
1589 			(*tag)->tag = malloc(itag->tag_len + 1);
1590 			if ((*tag)->tag == NULL) {
1591 				err = got_error_from_errno("malloc");
1592 				break;
1593 			}
1594 			memcpy((*tag)->tag, imsg.data + len,
1595 			    itag->tag_len);
1596 			(*tag)->tag[itag->tag_len] = '\0';
1597 		}
1598 		len += itag->tag_len;
1599 
1600 		(*tag)->obj_type = itag->obj_type;
1601 		(*tag)->tagger_time = itag->tagger_time;
1602 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1603 
1604 		if (itag->tagger_len == 0) {
1605 			(*tag)->tagger = strdup("");
1606 			if ((*tag)->tagger == NULL) {
1607 				err = got_error_from_errno("strdup");
1608 				break;
1609 			}
1610 		} else {
1611 			(*tag)->tagger = malloc(itag->tagger_len + 1);
1612 			if ((*tag)->tagger == NULL) {
1613 				err = got_error_from_errno("malloc");
1614 				break;
1615 			}
1616 			memcpy((*tag)->tagger, imsg.data + len,
1617 			    itag->tagger_len);
1618 			(*tag)->tagger[itag->tagger_len] = '\0';
1619 		}
1620 		len += itag->tagger_len;
1621 
1622 		if (itag->tagmsg_len == 0) {
1623 			(*tag)->tagmsg = strdup("");
1624 			if ((*tag)->tagmsg == NULL) {
1625 				err = got_error_from_errno("strdup");
1626 				break;
1627 			}
1628 		} else {
1629 			size_t offset = 0, remain = itag->tagmsg_len;
1630 
1631 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1632 			if ((*tag)->tagmsg == NULL) {
1633 				err = got_error_from_errno("malloc");
1634 				break;
1635 			}
1636 			while (remain > 0) {
1637 				struct imsg imsg_log;
1638 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1639 				    remain);
1640 
1641 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1642 				if (err)
1643 					return err;
1644 
1645 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1646 					return got_error(GOT_ERR_PRIVSEP_MSG);
1647 
1648 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1649 				    n);
1650 				imsg_free(&imsg_log);
1651 				offset += n;
1652 				remain -= n;
1653 			}
1654 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1655 		}
1656 
1657 		break;
1658 	default:
1659 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1660 		break;
1661 	}
1662 
1663 	imsg_free(&imsg);
1664 
1665 	return err;
1666 }
1667 
1668 const struct got_error *
1669 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1670     struct got_packidx *packidx)
1671 {
1672 	const struct got_error *err = NULL;
1673 	struct got_imsg_packidx ipackidx;
1674 	struct got_imsg_pack ipack;
1675 	int fd;
1676 
1677 	ipackidx.len = packidx->len;
1678 	fd = dup(packidx->fd);
1679 	if (fd == -1)
1680 		return got_error_from_errno("dup");
1681 
1682 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1683 	    sizeof(ipackidx)) == -1) {
1684 		err = got_error_from_errno("imsg_compose PACKIDX");
1685 		close(fd);
1686 		return err;
1687 	}
1688 
1689 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1690 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1691 		return got_error(GOT_ERR_NO_SPACE);
1692 	ipack.filesize = pack->filesize;
1693 
1694 	fd = dup(pack->fd);
1695 	if (fd == -1)
1696 		return got_error_from_errno("dup");
1697 
1698 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1699 	    == -1) {
1700 		err = got_error_from_errno("imsg_compose PACK");
1701 		close(fd);
1702 		return err;
1703 	}
1704 
1705 	return flush_imsg(ibuf);
1706 }
1707 
1708 const struct got_error *
1709 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1710     struct got_object_id *id)
1711 {
1712 	struct got_imsg_packed_object iobj;
1713 
1714 	iobj.idx = idx;
1715 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
1716 
1717 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1718 	    &iobj, sizeof(iobj)) == -1)
1719 		return got_error_from_errno("imsg_compose "
1720 		    "PACKED_OBJECT_REQUEST");
1721 
1722 	return flush_imsg(ibuf);
1723 }
1724 
1725 const struct got_error *
1726 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
1727 {
1728 	const struct got_error *err = NULL;
1729 
1730 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
1731 	    NULL, 0) == -1) {
1732 		err = got_error_from_errno("imsg_compose "
1733 		    "GITCONFIG_PARSE_REQUEST");
1734 		close(fd);
1735 		return err;
1736 	}
1737 
1738 	return flush_imsg(ibuf);
1739 }
1740 
1741 const struct got_error *
1742 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
1743 {
1744 	if (imsg_compose(ibuf,
1745 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
1746 	    NULL, 0) == -1)
1747 		return got_error_from_errno("imsg_compose "
1748 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
1749 
1750 	return flush_imsg(ibuf);
1751 }
1752 
1753 const struct got_error *
1754 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
1755 {
1756 	if (imsg_compose(ibuf,
1757 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
1758 		return got_error_from_errno("imsg_compose "
1759 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
1760 
1761 	return flush_imsg(ibuf);
1762 }
1763 
1764 const struct got_error *
1765 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
1766 {
1767 	if (imsg_compose(ibuf,
1768 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
1769 		return got_error_from_errno("imsg_compose "
1770 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
1771 
1772 	return flush_imsg(ibuf);
1773 }
1774 
1775 const struct got_error *
1776 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
1777 {
1778 	if (imsg_compose(ibuf,
1779 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
1780 		return got_error_from_errno("imsg_compose "
1781 		    "GITCONFIG_REMOTE_REQUEST");
1782 
1783 	return flush_imsg(ibuf);
1784 }
1785 
1786 const struct got_error *
1787 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
1788 {
1789 	if (imsg_compose(ibuf,
1790 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
1791 		return got_error_from_errno("imsg_compose "
1792 		    "GITCONFIG_OWNER_REQUEST");
1793 
1794 	return flush_imsg(ibuf);
1795 }
1796 
1797 const struct got_error *
1798 got_privsep_send_gitconfig_str(struct imsgbuf *ibuf, const char *value)
1799 {
1800 	size_t len = value ? strlen(value) + 1 : 0;
1801 
1802 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_STR_VAL, 0, 0, -1,
1803 	    value, len) == -1)
1804 		return got_error_from_errno("imsg_compose GITCONFIG_STR_VAL");
1805 
1806 	return flush_imsg(ibuf);
1807 }
1808 
1809 const struct got_error *
1810 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
1811 {
1812 	const struct got_error *err = NULL;
1813 	struct imsg imsg;
1814 	size_t datalen;
1815 	const size_t min_datalen = 0;
1816 
1817 	*str = NULL;
1818 
1819 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1820 	if (err)
1821 		return err;
1822 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1823 
1824 	switch (imsg.hdr.type) {
1825 	case GOT_IMSG_GITCONFIG_STR_VAL:
1826 		if (datalen == 0)
1827 			break;
1828 		*str = malloc(datalen);
1829 		if (*str == NULL) {
1830 			err = got_error_from_errno("malloc");
1831 			break;
1832 		}
1833 		if (strlcpy(*str, imsg.data, datalen) >= datalen)
1834 			err = got_error(GOT_ERR_NO_SPACE);
1835 		break;
1836 	default:
1837 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1838 		break;
1839 	}
1840 
1841 	imsg_free(&imsg);
1842 	return err;
1843 }
1844 
1845 const struct got_error *
1846 got_privsep_send_gitconfig_int(struct imsgbuf *ibuf, int value)
1847 {
1848 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_INT_VAL, 0, 0, -1,
1849 	    &value, sizeof(value)) == -1)
1850 		return got_error_from_errno("imsg_compose GITCONFIG_INT_VAL");
1851 
1852 	return flush_imsg(ibuf);
1853 }
1854 
1855 const struct got_error *
1856 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
1857 {
1858 	const struct got_error *err = NULL;
1859 	struct imsg imsg;
1860 	size_t datalen;
1861 	const size_t min_datalen =
1862 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
1863 
1864 	*val = 0;
1865 
1866 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1867 	if (err)
1868 		return err;
1869 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1870 
1871 	switch (imsg.hdr.type) {
1872 	case GOT_IMSG_GITCONFIG_INT_VAL:
1873 		if (datalen != sizeof(*val)) {
1874 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1875 			break;
1876 		}
1877 		memcpy(val, imsg.data, sizeof(*val));
1878 		break;
1879 	default:
1880 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1881 		break;
1882 	}
1883 
1884 	imsg_free(&imsg);
1885 	return err;
1886 }
1887 
1888 const struct got_error *
1889 got_privsep_send_gitconfig_remotes(struct imsgbuf *ibuf,
1890     struct got_remote_repo *remotes, int nremotes)
1891 {
1892 	const struct got_error *err = NULL;
1893 	struct got_imsg_remotes iremotes;
1894 	int i;
1895 
1896 	iremotes.nremotes = nremotes;
1897 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_REMOTES, 0, 0, -1,
1898 	    &iremotes, sizeof(iremotes)) == -1)
1899 		return got_error_from_errno("imsg_compose GITCONFIG_REMOTES");
1900 
1901 	err = flush_imsg(ibuf);
1902 	imsg_clear(ibuf);
1903 	if (err)
1904 		return err;
1905 
1906 	for (i = 0; i < nremotes; i++) {
1907 		struct got_imsg_remote iremote;
1908 		size_t len = sizeof(iremote);
1909 		struct ibuf *wbuf;
1910 
1911 		iremote.name_len = strlen(remotes[i].name);
1912 		len += iremote.name_len;
1913 		iremote.url_len = strlen(remotes[i].url);
1914 		len += iremote.url_len;
1915 
1916 		wbuf = imsg_create(ibuf, GOT_IMSG_GITCONFIG_REMOTE, 0, 0, len);
1917 		if (wbuf == NULL)
1918 			return got_error_from_errno(
1919 			    "imsg_create GITCONFIG_REMOTE");
1920 
1921 		if (imsg_add(wbuf, &iremote, sizeof(iremote)) == -1) {
1922 			err = got_error_from_errno(
1923 			    "imsg_add GIITCONFIG_REMOTE");
1924 			ibuf_free(wbuf);
1925 			return err;
1926 		}
1927 
1928 		if (imsg_add(wbuf, remotes[i].name, iremote.name_len) == -1) {
1929 			err = got_error_from_errno(
1930 			    "imsg_add GIITCONFIG_REMOTE");
1931 			ibuf_free(wbuf);
1932 			return err;
1933 		}
1934 		if (imsg_add(wbuf, remotes[i].url, iremote.url_len) == -1) {
1935 			err = got_error_from_errno(
1936 			    "imsg_add GIITCONFIG_REMOTE");
1937 			ibuf_free(wbuf);
1938 			return err;
1939 		}
1940 
1941 		wbuf->fd = -1;
1942 		imsg_close(ibuf, wbuf);
1943 		err = flush_imsg(ibuf);
1944 		if (err)
1945 			return err;
1946 	}
1947 
1948 	return NULL;
1949 }
1950 
1951 const struct got_error *
1952 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
1953     int *nremotes, struct imsgbuf *ibuf)
1954 {
1955 	const struct got_error *err = NULL;
1956 	struct imsg imsg;
1957 	size_t datalen;
1958 	struct got_imsg_remotes iremotes;
1959 	struct got_imsg_remote iremote;
1960 
1961 	*remotes = NULL;
1962 	*nremotes = 0;
1963 	iremotes.nremotes = 0;
1964 
1965 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
1966 	if (err)
1967 		return err;
1968 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1969 
1970 	switch (imsg.hdr.type) {
1971 	case GOT_IMSG_GITCONFIG_REMOTES:
1972 		if (datalen != sizeof(iremotes)) {
1973 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1974 			break;
1975 		}
1976 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
1977 		if (iremotes.nremotes == 0) {
1978 			imsg_free(&imsg);
1979 			return NULL;
1980 		}
1981 		break;
1982 	default:
1983 		imsg_free(&imsg);
1984 		return got_error(GOT_ERR_PRIVSEP_MSG);
1985 	}
1986 
1987 	imsg_free(&imsg);
1988 
1989 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(iremote));
1990 	if (*remotes == NULL)
1991 		return got_error_from_errno("recallocarray");
1992 
1993 	while (*nremotes < iremotes.nremotes) {
1994 		struct got_remote_repo *remote;
1995 	
1996 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
1997 		if (err)
1998 			break;
1999 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2000 
2001 		switch (imsg.hdr.type) {
2002 		case GOT_IMSG_GITCONFIG_REMOTE:
2003 			remote = &(*remotes)[*nremotes];
2004 			if (datalen < sizeof(iremote)) {
2005 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2006 				break;
2007 			}
2008 			memcpy(&iremote, imsg.data, sizeof(iremote));
2009 			if (iremote.name_len == 0 || iremote.url_len == 0 ||
2010 			    (sizeof(iremote) + iremote.name_len +
2011 			    iremote.url_len) > datalen) {
2012 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2013 				break;
2014 			}
2015 			remote->name = strndup(imsg.data + sizeof(iremote),
2016 			    iremote.name_len);
2017 			if (remote->name == NULL) {
2018 				err = got_error_from_errno("strndup");
2019 				break;
2020 			}
2021 			remote->url = strndup(imsg.data + sizeof(iremote) +
2022 			    iremote.name_len, iremote.url_len);
2023 			if (remote->url == NULL) {
2024 				err = got_error_from_errno("strndup");
2025 				free(remote->name);
2026 				break;
2027 			}
2028 			(*nremotes)++;
2029 			break;
2030 		default:
2031 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2032 			break;
2033 		}
2034 
2035 		imsg_free(&imsg);
2036 		if (err)
2037 			break;
2038 	}
2039 
2040 	if (err) {
2041 		int i;
2042 		for (i = 0; i < *nremotes; i++) {
2043 			free((*remotes)[i].name);
2044 			free((*remotes)[i].url);
2045 		}
2046 		free(*remotes);
2047 		*remotes = NULL;
2048 		*nremotes = 0;
2049 	}
2050 	return err;
2051 }
2052 
2053 const struct got_error *
2054 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2055      struct got_object_id *id, int idx, const char *path)
2056 {
2057 	const struct got_error *err = NULL;
2058 	struct ibuf *wbuf;
2059 	size_t path_len = strlen(path) + 1;
2060 
2061 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2062 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2063 	if (wbuf == NULL)
2064 		return got_error_from_errno(
2065 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2066 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2067 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2068 		ibuf_free(wbuf);
2069 		return err;
2070 	}
2071 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1) {
2072 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2073 		ibuf_free(wbuf);
2074 		return err;
2075 	}
2076 	if (imsg_add(wbuf, path, path_len) == -1) {
2077 		err = got_error_from_errno("imsg_add COMMIT_TRAVERSAL_REQUEST");
2078 		ibuf_free(wbuf);
2079 		return err;
2080 	}
2081 
2082 	wbuf->fd = -1;
2083 	imsg_close(ibuf, wbuf);
2084 
2085 	return flush_imsg(ibuf);
2086 }
2087 
2088 const struct got_error *
2089 got_privsep_send_traversed_commits(struct got_object_id *commit_ids, 
2090     size_t ncommits, struct imsgbuf *ibuf)
2091 {
2092 	const struct got_error *err;
2093 	struct ibuf *wbuf;
2094 	int i;
2095 
2096 	wbuf = imsg_create(ibuf, GOT_IMSG_TRAVERSED_COMMITS, 0, 0,
2097 	    sizeof(struct got_imsg_traversed_commits) +
2098 	    ncommits * SHA1_DIGEST_LENGTH);
2099 	if (wbuf == NULL)
2100 		return got_error_from_errno("imsg_create TRAVERSED_COMMITS");
2101 
2102 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1) {
2103 		err = got_error_from_errno("imsg_add TRAVERSED_COMMITS");
2104 		ibuf_free(wbuf);
2105 		return err;
2106 	}
2107 	for (i = 0; i < ncommits; i++) {
2108 		struct got_object_id *id = &commit_ids[i];
2109 		if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1) {
2110 			err = got_error_from_errno(
2111 			    "imsg_add TRAVERSED_COMMITS");
2112 			ibuf_free(wbuf);
2113 			return err;
2114 		}
2115 	}
2116 
2117 	wbuf->fd = -1;
2118 	imsg_close(ibuf, wbuf);
2119 
2120 	return flush_imsg(ibuf);
2121 }
2122 
2123 const struct got_error *
2124 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2125     struct got_object_id **changed_commit_id,
2126     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2127 {
2128 	const struct got_error *err = NULL;
2129 	struct imsg imsg;
2130 	struct got_imsg_traversed_commits *icommits;
2131 	size_t datalen;
2132 	int i, done = 0;
2133 
2134 	*changed_commit = NULL;
2135 	*changed_commit_id = NULL;
2136 
2137 	while (!done) {
2138 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2139 		if (err)
2140 			return err;
2141 
2142 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2143 		switch (imsg.hdr.type) {
2144 		case GOT_IMSG_TRAVERSED_COMMITS:
2145 			icommits = imsg.data;
2146 			if (datalen != sizeof(*icommits) +
2147 			    icommits->ncommits * SHA1_DIGEST_LENGTH) {
2148 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2149 				break;
2150 			}
2151 			for (i = 0; i < icommits->ncommits; i++) {
2152 				struct got_object_qid *qid;
2153 				uint8_t *sha1 = (uint8_t *)imsg.data +
2154 				    sizeof(*icommits) + i * SHA1_DIGEST_LENGTH;
2155 				err = got_object_qid_alloc_partial(&qid);
2156 				if (err)
2157 					break;
2158 				memcpy(qid->id->sha1, sha1, SHA1_DIGEST_LENGTH);
2159 				SIMPLEQ_INSERT_TAIL(commit_ids, qid, entry);
2160 
2161 				/* The last commit may contain a change. */
2162 				if (i == icommits->ncommits - 1) {
2163 					*changed_commit_id =
2164 					    got_object_id_dup(qid->id);
2165 					if (*changed_commit_id == NULL) {
2166 						err = got_error_from_errno(
2167 						    "got_object_id_dup");
2168 						break;
2169 					}
2170 				}
2171 			}
2172 			break;
2173 		case GOT_IMSG_COMMIT:
2174 			if (*changed_commit_id == NULL) {
2175 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2176 				break;
2177 			}
2178 			err = get_commit_from_imsg(changed_commit, &imsg,
2179 			    datalen, ibuf);
2180 			break;
2181 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2182 			done = 1;
2183 			break;
2184 		default:
2185 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2186 			break;
2187 		}
2188 
2189 		imsg_free(&imsg);
2190 		if (err)
2191 			break;
2192 	}
2193 
2194 	if (err)
2195 		got_object_id_queue_free(commit_ids);
2196 	return err;
2197 }
2198 
2199 const struct got_error *
2200 got_privsep_send_commit_traversal_done(struct imsgbuf *ibuf)
2201 {
2202 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_DONE, 0, 0, -1,
2203 	    NULL, 0) == -1)
2204 		return got_error_from_errno("imsg_compose TRAVERSAL_DONE");
2205 
2206 	return flush_imsg(ibuf);
2207 }
2208 
2209 const struct got_error *
2210 got_privsep_unveil_exec_helpers(void)
2211 {
2212 	const char *helpers[] = {
2213 	    GOT_PATH_PROG_READ_PACK,
2214 	    GOT_PATH_PROG_READ_OBJECT,
2215 	    GOT_PATH_PROG_READ_COMMIT,
2216 	    GOT_PATH_PROG_READ_TREE,
2217 	    GOT_PATH_PROG_READ_BLOB,
2218 	    GOT_PATH_PROG_READ_TAG,
2219 	    GOT_PATH_PROG_READ_GITCONFIG,
2220 	    GOT_PATH_PROG_FETCH_PACK,
2221 	    GOT_PATH_PROG_INDEX_PACK,
2222 	};
2223 	int i;
2224 
2225 	for (i = 0; i < nitems(helpers); i++) {
2226 		if (unveil(helpers[i], "x") == 0)
2227 			continue;
2228 		return got_error_from_errno2("unveil", helpers[i]);
2229 	}
2230 
2231 	return NULL;
2232 }
2233 
2234 void
2235 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
2236 {
2237 	if (close(imsg_fds[0]) != 0) {
2238 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2239 		_exit(1);
2240 	}
2241 
2242 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
2243 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2244 		_exit(1);
2245 	}
2246 	if (closefrom(GOT_IMSG_FD_CHILD + 1) == -1) {
2247 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
2248 		_exit(1);
2249 	}
2250 
2251 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
2252 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
2253 		    strerror(errno));
2254 		_exit(1);
2255 	}
2256 }