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Date:: Sun Feb 19 17:56:27 2023 UTC
Message:: use struct got_object_id instead of sha1 digest in a few imsg change got_img_commit_painting_request, got_imsg_tag_object and the data of GOT_IMSG_TRAVERSED_COMMITS not to copy the sha1 digest to the imsg buffer and then from it to a new struct got_object_id but send directly the whole struct. ok stsp@
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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/wait.h>
22 
23 #include <ctype.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <errno.h>
30 #include <stdint.h>
31 #include <poll.h>
32 #include <imsg.h>
33 #include <sha1.h>
34 #include <unistd.h>
35 #include <zlib.h>
36 
37 #include "got_object.h"
38 #include "got_error.h"
39 #include "got_path.h"
40 #include "got_repository.h"
41 
42 #include "got_lib_sha1.h"
43 #include "got_lib_delta.h"
44 #include "got_lib_inflate.h"
45 #include "got_lib_object.h"
46 #include "got_lib_object_parse.h"
47 #include "got_lib_privsep.h"
48 #include "got_lib_pack.h"
49 #include "got_lib_poll.h"
50 
51 #include "got_privsep.h"
52 
53 #ifndef MIN
54 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 #endif
56 
57 #ifndef nitems
58 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
59 #endif
60 
61 static const struct got_error *
62 read_imsg(struct imsgbuf *ibuf)
63 {
64 	const struct got_error *err;
65 	size_t n;
66 
67 	err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
68 	if (err) {
69 		if (err->code == GOT_ERR_EOF)
70 			return got_error(GOT_ERR_PRIVSEP_PIPE);
71 		return err;
72 	}
73 
74 	n = imsg_read(ibuf);
75 	if (n == -1) {
76 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
77 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
78 		return got_error(GOT_ERR_PRIVSEP_READ);
79 	}
80 	if (n == 0)
81 		return got_error(GOT_ERR_PRIVSEP_PIPE);
82 
83 	return NULL;
84 }
85 
86 const struct got_error *
87 got_privsep_wait_for_child(pid_t pid)
88 {
89 	int child_status;
90 
91 	if (waitpid(pid, &child_status, 0) == -1)
92 		return got_error_from_errno("waitpid");
93 
94 	if (!WIFEXITED(child_status))
95 		return got_error(GOT_ERR_PRIVSEP_DIED);
96 
97 	if (WEXITSTATUS(child_status) != 0)
98 		return got_error(GOT_ERR_PRIVSEP_EXIT);
99 
100 	return NULL;
101 }
102 
103 static const struct got_error *
104 recv_imsg_error(struct imsg *imsg, size_t datalen)
105 {
106 	struct got_imsg_error *ierr;
107 
108 	if (datalen != sizeof(*ierr))
109 		return got_error(GOT_ERR_PRIVSEP_LEN);
110 
111 	ierr = imsg->data;
112 	if (ierr->code == GOT_ERR_ERRNO) {
113 		static struct got_error serr;
114 		serr.code = GOT_ERR_ERRNO;
115 		serr.msg = strerror(ierr->errno_code);
116 		return &serr;
117 	}
118 
119 	return got_error(ierr->code);
120 }
121 
122 const struct got_error *
123 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
124     size_t min_datalen)
125 {
126 	const struct got_error *err;
127 	ssize_t n;
128 
129 	n = imsg_get(ibuf, imsg);
130 	if (n == -1)
131 		return got_error_from_errno("imsg_get");
132 
133 	while (n == 0) {
134 		err = read_imsg(ibuf);
135 		if (err)
136 			return err;
137 		n = imsg_get(ibuf, imsg);
138 		if (n == -1)
139 			return got_error_from_errno("imsg_get");
140 	}
141 
142 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
143 		return got_error(GOT_ERR_PRIVSEP_LEN);
144 
145 	if (imsg->hdr.type == GOT_IMSG_ERROR) {
146 		size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
147 		return recv_imsg_error(imsg, datalen);
148 	}
149 
150 	return NULL;
151 }
152 
153 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
154 void
155 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
156 {
157 	const struct got_error *poll_err;
158 	struct got_imsg_error ierr;
159 	int ret;
160 
161 	ierr.code = err->code;
162 	if (err->code == GOT_ERR_ERRNO)
163 		ierr.errno_code = errno;
164 	else
165 		ierr.errno_code = 0;
166 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
167 	if (ret == -1) {
168 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
169 		    getprogname(), err->code, err->msg, strerror(errno));
170 		return;
171 	}
172 
173 	poll_err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
174 	if (poll_err) {
175 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
176 		    getprogname(), err->code, err->msg, poll_err->msg);
177 		return;
178 	}
179 
180 	ret = imsg_flush(ibuf);
181 	if (ret == -1) {
182 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
183 		    getprogname(), err->code, err->msg, strerror(errno));
184 		imsg_clear(ibuf);
185 		return;
186 	}
187 }
188 
189 static const struct got_error *
190 flush_imsg(struct imsgbuf *ibuf)
191 {
192 	const struct got_error *err;
193 
194 	err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
195 	if (err)
196 		return err;
197 
198 	if (imsg_flush(ibuf) == -1) {
199 		imsg_clear(ibuf);
200 		return got_error_from_errno("imsg_flush");
201 	}
202 
203 	return NULL;
204 }
205 
206 const struct got_error *
207 got_privsep_flush_imsg(struct imsgbuf *ibuf)
208 {
209 	return flush_imsg(ibuf);
210 }
211 
212 const struct got_error *
213 got_privsep_send_stop(int fd)
214 {
215 	const struct got_error *err = NULL;
216 	struct imsgbuf ibuf;
217 
218 	imsg_init(&ibuf, fd);
219 
220 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
221 		return got_error_from_errno("imsg_compose STOP");
222 
223 	err = flush_imsg(&ibuf);
224 	return err;
225 }
226 
227 const struct got_error *
228 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd,
229     struct got_object_id *id)
230 {
231 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_REQUEST, 0, 0, fd,
232 	    id, sizeof(*id)) == -1)
233 		return got_error_from_errno("imsg_compose OBJECT_REQUEST");
234 
235 	return flush_imsg(ibuf);
236 }
237 
238 const struct got_error *
239 got_privsep_send_raw_obj_req(struct imsgbuf *ibuf, int fd,
240     struct got_object_id *id)
241 {
242 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_REQUEST, 0, 0, fd,
243 	    id, sizeof(*id)) == -1)
244 		return got_error_from_errno("imsg_compose RAW_OBJECT_REQUEST");
245 
246 	return flush_imsg(ibuf);
247 }
248 
249 const struct got_error *
250 got_privsep_send_raw_obj_outfd(struct imsgbuf *ibuf, int outfd)
251 {
252 	const struct got_error *err = NULL;
253 
254 	if (imsg_compose(ibuf, GOT_IMSG_RAW_OBJECT_OUTFD, 0, 0, outfd, NULL, 0)
255 	    == -1) {
256 		err = got_error_from_errno("imsg_compose RAW_OBJECT_OUTFD");
257 		close(outfd);
258 		return err;
259 	}
260 
261 	return flush_imsg(ibuf);
262 }
263 
264 const struct got_error *
265 got_privsep_send_raw_obj(struct imsgbuf *ibuf, off_t size, size_t hdrlen,
266     uint8_t *data)
267 {
268 	const struct got_error *err = NULL;
269 	struct got_imsg_raw_obj iobj;
270 	size_t len = sizeof(iobj);
271 	struct ibuf *wbuf;
272 
273 	memset(&iobj, 0, sizeof(iobj));
274 	iobj.hdrlen = hdrlen;
275 	iobj.size = size;
276 
277 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX)
278 		len += (size_t)size + hdrlen;
279 
280 	wbuf = imsg_create(ibuf, GOT_IMSG_RAW_OBJECT, 0, 0, len);
281 	if (wbuf == NULL) {
282 		err = got_error_from_errno("imsg_create RAW_OBJECT");
283 		return err;
284 	}
285 
286 	if (imsg_add(wbuf, &iobj, sizeof(iobj)) == -1)
287 		return got_error_from_errno("imsg_add RAW_OBJECT");
288 
289 	if (data && size + hdrlen <= GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
290 		if (imsg_add(wbuf, data, size + hdrlen) == -1)
291 			return got_error_from_errno("imsg_add RAW_OBJECT");
292 	}
293 
294 	wbuf->fd = -1;
295 	imsg_close(ibuf, wbuf);
296 
297 	return flush_imsg(ibuf);
298 }
299 
300 const struct got_error *
301 got_privsep_recv_raw_obj(uint8_t **outbuf, off_t *size, size_t *hdrlen,
302     struct imsgbuf *ibuf)
303 {
304 	const struct got_error *err = NULL;
305 	struct imsg imsg;
306 	struct got_imsg_raw_obj *iobj;
307 	size_t datalen;
308 
309 	*outbuf = NULL;
310 
311 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
312 	if (err)
313 		return err;
314 
315 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
316 
317 	switch (imsg.hdr.type) {
318 	case GOT_IMSG_RAW_OBJECT:
319 		if (datalen < sizeof(*iobj)) {
320 			err = got_error(GOT_ERR_PRIVSEP_LEN);
321 			break;
322 		}
323 		iobj = imsg.data;
324 		*size = iobj->size;
325 		*hdrlen = iobj->hdrlen;
326 
327 		if (datalen == sizeof(*iobj)) {
328 			/* Data has been written to file descriptor. */
329 			break;
330 		}
331 
332 		if (*size < 0 ||
333 		    *size + *hdrlen > GOT_PRIVSEP_INLINE_OBJECT_DATA_MAX) {
334 			err = got_error(GOT_ERR_PRIVSEP_LEN);
335 			break;
336 		}
337 
338 		*outbuf = malloc(*size + *hdrlen);
339 		if (*outbuf == NULL) {
340 			err = got_error_from_errno("malloc");
341 			break;
342 		}
343 		memcpy(*outbuf, imsg.data + sizeof(*iobj), *size + *hdrlen);
344 		break;
345 	default:
346 		err = got_error(GOT_ERR_PRIVSEP_MSG);
347 		break;
348 	}
349 
350 	imsg_free(&imsg);
351 
352 	return err;
353 }
354 
355 const struct got_error *
356 got_privsep_send_commit_req(struct imsgbuf *ibuf, int fd,
357     struct got_object_id *id, int pack_idx)
358 {
359 	const struct got_error *err = NULL;
360 	struct got_imsg_packed_object iobj;
361 	void *data;
362 	size_t len;
363 
364 	memset(&iobj, 0, sizeof(iobj));
365 	if (pack_idx != -1) { /* commit is packed */
366 		iobj.idx = pack_idx;
367 		memcpy(&iobj.id, id, sizeof(iobj.id));
368 		data = &iobj;
369 		len = sizeof(iobj);
370 	} else {
371 		data = id;
372 		len = sizeof(*id);
373 	}
374 
375 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_REQUEST, 0, 0, fd, data, len)
376 	    == -1) {
377 		err = got_error_from_errno("imsg_compose COMMIT_REQUEST");
378 		close(fd);
379 		return err;
380 	}
381 
382 	return flush_imsg(ibuf);
383 }
384 
385 const struct got_error *
386 got_privsep_send_tree_req(struct imsgbuf *ibuf, int fd,
387     struct got_object_id *id, int pack_idx)
388 {
389 	struct ibuf *wbuf;
390 	size_t len;
391 
392 	if (pack_idx != -1)
393 		len = sizeof(struct got_imsg_packed_object);
394 	else
395 		len = sizeof(*id);
396 
397 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_REQUEST, 0, 0, len);
398 	if (wbuf == NULL)
399 		return got_error_from_errno("imsg_create TREE_REQUEST");
400 
401 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
402 		return got_error_from_errno("imsg_add TREE_REQUEST");
403 
404 	if (pack_idx != -1) { /* tree is packed */
405 		if (imsg_add(wbuf, &pack_idx, sizeof(pack_idx)) == -1)
406 			return got_error_from_errno("imsg_add TREE_REQUEST");
407 	}
408 
409 	wbuf->fd = fd;
410 	imsg_close(ibuf, wbuf);
411 
412 	return flush_imsg(ibuf);
413 }
414 
415 const struct got_error *
416 got_privsep_send_tag_req(struct imsgbuf *ibuf, int fd,
417     struct got_object_id *id, int pack_idx)
418 {
419 	struct got_imsg_packed_object iobj;
420 	void *data;
421 	size_t len;
422 
423 	memset(&iobj, 0, sizeof(iobj));
424 	if (pack_idx != -1) { /* tag is packed */
425 		iobj.idx = pack_idx;
426 		memcpy(&iobj.id, id, sizeof(iobj.id));
427 		data = &iobj;
428 		len = sizeof(iobj);
429 	} else {
430 		data = id;
431 		len = sizeof(*id);
432 	}
433 
434 	if (imsg_compose(ibuf, GOT_IMSG_TAG_REQUEST, 0, 0, fd, data, len)
435 	    == -1)
436 		return got_error_from_errno("imsg_compose TAG_REQUEST");
437 
438 	return flush_imsg(ibuf);
439 }
440 
441 const struct got_error *
442 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd,
443     struct got_object_id *id, int pack_idx)
444 {
445 	const struct got_error *err = NULL;
446 	struct got_imsg_packed_object iobj;
447 	void *data;
448 	size_t len;
449 
450 	memset(&iobj, 0, sizeof(iobj));
451 	if (pack_idx != -1) { /* blob is packed */
452 		iobj.idx = pack_idx;
453 		memcpy(&iobj.id, id, sizeof(iobj.id));
454 		data = &iobj;
455 		len = sizeof(iobj);
456 	} else {
457 		data = id;
458 		len = sizeof(*id);
459 	}
460 
461 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, data, len)
462 	    == -1) {
463 		err = got_error_from_errno("imsg_compose BLOB_REQUEST");
464 		close(infd);
465 		return err;
466 	}
467 
468 	return flush_imsg(ibuf);
469 }
470 
471 const struct got_error *
472 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
473 {
474 	const struct got_error *err = NULL;
475 
476 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
477 	    == -1) {
478 		err = got_error_from_errno("imsg_compose BLOB_OUTFD");
479 		close(outfd);
480 		return err;
481 	}
482 
483 	return flush_imsg(ibuf);
484 }
485 
486 static const struct got_error *
487 send_fd(struct imsgbuf *ibuf, int imsg_code, int fd)
488 {
489 	const struct got_error *err = NULL;
490 
491 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, NULL, 0) == -1) {
492 		err = got_error_from_errno("imsg_compose TMPFD");
493 		close(fd);
494 		return err;
495 	}
496 
497 	return flush_imsg(ibuf);
498 }
499 
500 const struct got_error *
501 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
502 {
503 	return send_fd(ibuf, GOT_IMSG_TMPFD, fd);
504 }
505 
506 const struct got_error *
507 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
508 {
509 	struct got_imsg_object iobj;
510 
511 	memset(&iobj, 0, sizeof(iobj));
512 
513 	memcpy(&iobj.id, &obj->id, sizeof(iobj.id));
514 	iobj.type = obj->type;
515 	iobj.flags = obj->flags;
516 	iobj.hdrlen = obj->hdrlen;
517 	iobj.size = obj->size;
518 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
519 		iobj.pack_offset = obj->pack_offset;
520 		iobj.pack_idx = obj->pack_idx;
521 	}
522 
523 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
524 	    == -1)
525 		return got_error_from_errno("imsg_compose OBJECT");
526 
527 	return flush_imsg(ibuf);
528 }
529 
530 const struct got_error *
531 got_privsep_send_fetch_req(struct imsgbuf *ibuf, int fd,
532     struct got_pathlist_head *have_refs, int fetch_all_branches,
533     struct got_pathlist_head *wanted_branches,
534     struct got_pathlist_head *wanted_refs, int list_refs_only,
535     const char *worktree_branch, const char *remote_head,
536     int no_head, int verbosity)
537 {
538 	const struct got_error *err = NULL;
539 	struct ibuf *wbuf;
540 	struct got_pathlist_entry *pe;
541 	struct got_imsg_fetch_request fetchreq;
542 	size_t remote_head_len, worktree_branch_len, len = sizeof(fetchreq);
543 
544 	if (worktree_branch) {
545 		worktree_branch_len = strlen(worktree_branch);
546 		len += worktree_branch_len;
547 	}
548 	if (remote_head) {
549 		remote_head_len = strlen(remote_head);
550 		len += remote_head_len;
551 	}
552 
553 	if (len >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
554 		close(fd);
555 		return got_error(GOT_ERR_NO_SPACE);
556 	}
557 
558 	wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_REQUEST, 0, 0, len);
559 	if (wbuf == NULL)
560 		return got_error_from_errno("imsg_create FETCH_HAVE_REF");
561 
562 	memset(&fetchreq, 0, sizeof(fetchreq));
563 	fetchreq.no_head = no_head;
564 	fetchreq.fetch_all_branches = fetch_all_branches;
565 	fetchreq.list_refs_only = list_refs_only;
566 	fetchreq.verbosity = verbosity;
567 	if (worktree_branch != NULL)
568 		fetchreq.worktree_branch_len = worktree_branch_len;
569 	if (remote_head != NULL)
570 		fetchreq.remote_head_len = remote_head_len;
571 	TAILQ_FOREACH(pe, have_refs, entry)
572 		fetchreq.n_have_refs++;
573 	TAILQ_FOREACH(pe, wanted_branches, entry)
574 		fetchreq.n_wanted_branches++;
575 	TAILQ_FOREACH(pe, wanted_refs, entry)
576 		fetchreq.n_wanted_refs++;
577 	if (imsg_add(wbuf, &fetchreq, sizeof(fetchreq)) == -1)
578 		return got_error_from_errno("imsg_add FETCH_REQUEST");
579 	if (worktree_branch) {
580 		if (imsg_add(wbuf, worktree_branch, worktree_branch_len) == -1)
581 			return got_error_from_errno("imsg_add FETCH_REQUEST");
582 	}
583 	if (remote_head) {
584 		if (imsg_add(wbuf, remote_head, remote_head_len) == -1)
585 			return got_error_from_errno("imsg_add FETCH_REQUEST");
586 	}
587 	wbuf->fd = fd;
588 	imsg_close(ibuf, wbuf);
589 
590 	err = flush_imsg(ibuf);
591 	if (err) {
592 		close(fd);
593 		return err;
594 	}
595 	fd = -1;
596 
597 	TAILQ_FOREACH(pe, have_refs, entry) {
598 		const char *name = pe->path;
599 		size_t name_len = pe->path_len;
600 		struct got_object_id *id = pe->data;
601 
602 		len = sizeof(struct got_imsg_fetch_have_ref) + name_len;
603 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_HAVE_REF, 0, 0, len);
604 		if (wbuf == NULL)
605 			return got_error_from_errno("imsg_create FETCH_HAVE_REF");
606 
607 		/* Keep in sync with struct got_imsg_fetch_have_ref! */
608 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
609 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
610 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
611 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
612 		if (imsg_add(wbuf, name, name_len) == -1)
613 			return got_error_from_errno("imsg_add FETCH_HAVE_REF");
614 
615 		wbuf->fd = -1;
616 		imsg_close(ibuf, wbuf);
617 		err = flush_imsg(ibuf);
618 		if (err)
619 			return err;
620 	}
621 
622 	TAILQ_FOREACH(pe, wanted_branches, entry) {
623 		const char *name = pe->path;
624 		size_t name_len = pe->path_len;
625 
626 		len = sizeof(struct got_imsg_fetch_wanted_branch) + name_len;
627 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_BRANCH, 0, 0,
628 		    len);
629 		if (wbuf == NULL)
630 			return got_error_from_errno(
631 			    "imsg_create FETCH_WANTED_BRANCH");
632 
633 		/* Keep in sync with struct got_imsg_fetch_wanted_branch! */
634 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
635 			return got_error_from_errno(
636 			    "imsg_add FETCH_WANTED_BRANCH");
637 		if (imsg_add(wbuf, name, name_len) == -1)
638 			return got_error_from_errno(
639 			    "imsg_add FETCH_WANTED_BRANCH");
640 
641 		wbuf->fd = -1;
642 		imsg_close(ibuf, wbuf);
643 		err = flush_imsg(ibuf);
644 		if (err)
645 			return err;
646 	}
647 
648 	TAILQ_FOREACH(pe, wanted_refs, entry) {
649 		const char *name = pe->path;
650 		size_t name_len = pe->path_len;
651 
652 		len = sizeof(struct got_imsg_fetch_wanted_ref) + name_len;
653 		wbuf = imsg_create(ibuf, GOT_IMSG_FETCH_WANTED_REF, 0, 0,
654 		    len);
655 		if (wbuf == NULL)
656 			return got_error_from_errno(
657 			    "imsg_create FETCH_WANTED_REF");
658 
659 		/* Keep in sync with struct got_imsg_fetch_wanted_ref! */
660 		if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
661 			return got_error_from_errno(
662 			    "imsg_add FETCH_WANTED_REF");
663 		if (imsg_add(wbuf, name, name_len) == -1)
664 			return got_error_from_errno(
665 			    "imsg_add FETCH_WANTED_REF");
666 
667 		wbuf->fd = -1;
668 		imsg_close(ibuf, wbuf);
669 		err = flush_imsg(ibuf);
670 		if (err)
671 			return err;
672 	}
673 
674 
675 	return NULL;
676 
677 }
678 
679 const struct got_error *
680 got_privsep_send_fetch_outfd(struct imsgbuf *ibuf, int fd)
681 {
682 	return send_fd(ibuf, GOT_IMSG_FETCH_OUTFD, fd);
683 }
684 
685 const struct got_error *
686 got_privsep_recv_fetch_progress(int *done, struct got_object_id **id,
687     char **refname, struct got_pathlist_head *symrefs, char **server_progress,
688     off_t *packfile_size, uint8_t *pack_sha1, struct imsgbuf *ibuf)
689 {
690 	const struct got_error *err = NULL;
691 	struct imsg imsg;
692 	size_t datalen;
693 	struct got_imsg_fetch_symrefs *isymrefs = NULL;
694 	size_t n, remain;
695 	off_t off;
696 	int i;
697 
698 	*done = 0;
699 	*id = NULL;
700 	*refname = NULL;
701 	*server_progress = NULL;
702 	*packfile_size = 0;
703 	memset(pack_sha1, 0, SHA1_DIGEST_LENGTH);
704 
705 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
706 	if (err)
707 		return err;
708 
709 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
710 	switch (imsg.hdr.type) {
711 	case GOT_IMSG_FETCH_SYMREFS:
712 		if (datalen < sizeof(*isymrefs)) {
713 			err = got_error(GOT_ERR_PRIVSEP_LEN);
714 			break;
715 		}
716 		if (isymrefs != NULL) {
717 			err = got_error(GOT_ERR_PRIVSEP_MSG);
718 			break;
719 		}
720 		isymrefs = (struct got_imsg_fetch_symrefs *)imsg.data;
721 		off = sizeof(*isymrefs);
722 		remain = datalen - off;
723 		for (n = 0; n < isymrefs->nsymrefs; n++) {
724 			struct got_imsg_fetch_symref *s;
725 			char *name, *target;
726 			if (remain < sizeof(struct got_imsg_fetch_symref)) {
727 				err = got_error(GOT_ERR_PRIVSEP_LEN);
728 				goto done;
729 			}
730 			s = (struct got_imsg_fetch_symref *)(imsg.data + off);
731 			off += sizeof(*s);
732 			remain -= sizeof(*s);
733 			if (remain < s->name_len) {
734 				err = got_error(GOT_ERR_PRIVSEP_LEN);
735 				goto done;
736 			}
737 			name = strndup(imsg.data + off, s->name_len);
738 			if (name == NULL) {
739 				err = got_error_from_errno("strndup");
740 				goto done;
741 			}
742 			off += s->name_len;
743 			remain -= s->name_len;
744 			if (remain < s->target_len) {
745 				err = got_error(GOT_ERR_PRIVSEP_LEN);
746 				free(name);
747 				goto done;
748 			}
749 			target = strndup(imsg.data + off, s->target_len);
750 			if (target == NULL) {
751 				err = got_error_from_errno("strndup");
752 				free(name);
753 				goto done;
754 			}
755 			off += s->target_len;
756 			remain -= s->target_len;
757 			err = got_pathlist_append(symrefs, name, target);
758 			if (err) {
759 				free(name);
760 				free(target);
761 				goto done;
762 			}
763 		}
764 		break;
765 	case GOT_IMSG_FETCH_REF:
766 		if (datalen <= sizeof(**id)) {
767 			err = got_error(GOT_ERR_PRIVSEP_MSG);
768 			break;
769 		}
770 		*id = malloc(sizeof(**id));
771 		if (*id == NULL) {
772 			err = got_error_from_errno("malloc");
773 			break;
774 		}
775 		memcpy(*id, imsg.data, sizeof(**id));
776 		*refname = strndup(imsg.data + sizeof(**id),
777 		    datalen - sizeof(**id));
778 		if (*refname == NULL) {
779 			err = got_error_from_errno("strndup");
780 			break;
781 		}
782 		break;
783 	case GOT_IMSG_FETCH_SERVER_PROGRESS:
784 		if (datalen == 0) {
785 			err = got_error(GOT_ERR_PRIVSEP_LEN);
786 			break;
787 		}
788 		*server_progress = strndup(imsg.data, datalen);
789 		if (*server_progress == NULL) {
790 			err = got_error_from_errno("strndup");
791 			break;
792 		}
793 		for (i = 0; i < datalen; i++) {
794 			if (!isprint((unsigned char)(*server_progress)[i]) &&
795 			    !isspace((unsigned char)(*server_progress)[i])) {
796 				err = got_error(GOT_ERR_PRIVSEP_MSG);
797 				free(*server_progress);
798 				*server_progress = NULL;
799 				goto done;
800 			}
801 		}
802 		break;
803 	case GOT_IMSG_FETCH_DOWNLOAD_PROGRESS:
804 		if (datalen < sizeof(*packfile_size)) {
805 			err = got_error(GOT_ERR_PRIVSEP_MSG);
806 			break;
807 		}
808 		memcpy(packfile_size, imsg.data, sizeof(*packfile_size));
809 		break;
810 	case GOT_IMSG_FETCH_DONE:
811 		if (datalen != SHA1_DIGEST_LENGTH) {
812 			err = got_error(GOT_ERR_PRIVSEP_MSG);
813 			break;
814 		}
815 		memcpy(pack_sha1, imsg.data, SHA1_DIGEST_LENGTH);
816 		*done = 1;
817 		break;
818 	default:
819 		err = got_error(GOT_ERR_PRIVSEP_MSG);
820 		break;
821 	}
822 done:
823 	if (err) {
824 		free(*id);
825 		*id = NULL;
826 		free(*refname);
827 		*refname = NULL;
828 	}
829 	imsg_free(&imsg);
830 	return err;
831 }
832 
833 static const struct got_error *
834 send_send_ref(const char *name, size_t name_len, struct got_object_id *id,
835     int delete, struct imsgbuf *ibuf)
836 {
837 	size_t len;
838 	struct ibuf *wbuf;
839 
840 	len = sizeof(struct got_imsg_send_ref) + name_len;
841 	wbuf = imsg_create(ibuf, GOT_IMSG_SEND_REF, 0, 0, len);
842 	if (wbuf == NULL)
843 		return got_error_from_errno("imsg_create SEND_REF");
844 
845 	/* Keep in sync with struct got_imsg_send_ref! */
846 	if (imsg_add(wbuf, id, sizeof(*id)) == -1)
847 		return got_error_from_errno("imsg_add SEND_REF");
848 	if (imsg_add(wbuf, &delete, sizeof(delete)) == -1)
849 		return got_error_from_errno("imsg_add SEND_REF");
850 	if (imsg_add(wbuf, &name_len, sizeof(name_len)) == -1)
851 		return got_error_from_errno("imsg_add SEND_REF");
852 	if (imsg_add(wbuf, name, name_len) == -1)
853 		return got_error_from_errno("imsg_add SEND_REF");
854 
855 	wbuf->fd = -1;
856 	imsg_close(ibuf, wbuf);
857 	return flush_imsg(ibuf);
858 }
859 
860 const struct got_error *
861 got_privsep_send_send_req(struct imsgbuf *ibuf, int fd,
862     struct got_pathlist_head *have_refs,
863     struct got_pathlist_head *delete_refs,
864     int verbosity)
865 {
866 	const struct got_error *err = NULL;
867 	struct got_pathlist_entry *pe;
868 	struct got_imsg_send_request sendreq;
869 	struct got_object_id zero_id;
870 
871 	memset(&zero_id, 0, sizeof(zero_id));
872 	memset(&sendreq, 0, sizeof(sendreq));
873 	sendreq.verbosity = verbosity;
874 	TAILQ_FOREACH(pe, have_refs, entry)
875 		sendreq.nrefs++;
876 	TAILQ_FOREACH(pe, delete_refs, entry)
877 		sendreq.nrefs++;
878 	if (imsg_compose(ibuf, GOT_IMSG_SEND_REQUEST, 0, 0, fd,
879 	    &sendreq, sizeof(sendreq)) == -1) {
880 		err = got_error_from_errno(
881 		    "imsg_compose FETCH_SERVER_PROGRESS");
882 		goto done;
883 	}
884 
885 	err = flush_imsg(ibuf);
886 	if (err)
887 		goto done;
888 	fd = -1;
889 
890 	TAILQ_FOREACH(pe, have_refs, entry) {
891 		const char *name = pe->path;
892 		size_t name_len = pe->path_len;
893 		struct got_object_id *id = pe->data;
894 		err = send_send_ref(name, name_len, id, 0, ibuf);
895 		if (err)
896 			goto done;
897 	}
898 
899 	TAILQ_FOREACH(pe, delete_refs, entry) {
900 		const char *name = pe->path;
901 		size_t name_len = pe->path_len;
902 		err = send_send_ref(name, name_len, &zero_id, 1, ibuf);
903 		if (err)
904 			goto done;
905 	}
906 done:
907 	if (fd != -1 && close(fd) == -1 && err == NULL)
908 		err = got_error_from_errno("close");
909 	return err;
910 
911 }
912 
913 const struct got_error *
914 got_privsep_recv_send_remote_refs(struct got_pathlist_head *remote_refs,
915     struct imsgbuf *ibuf)
916 {
917 	const struct got_error *err = NULL;
918 	struct imsg imsg;
919 	size_t datalen;
920 	int done = 0;
921 	struct got_imsg_send_remote_ref iremote_ref;
922 	struct got_object_id *id = NULL;
923 	char *refname = NULL;
924 	struct got_pathlist_entry *new;
925 
926 	while (!done) {
927 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
928 		if (err)
929 			return err;
930 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
931 		switch (imsg.hdr.type) {
932 		case GOT_IMSG_SEND_REMOTE_REF:
933 			if (datalen < sizeof(iremote_ref)) {
934 				err = got_error(GOT_ERR_PRIVSEP_MSG);
935 				goto done;
936 			}
937 			memcpy(&iremote_ref, imsg.data, sizeof(iremote_ref));
938 			if (datalen != sizeof(iremote_ref) +
939 			    iremote_ref.name_len) {
940 				err = got_error(GOT_ERR_PRIVSEP_MSG);
941 				goto done;
942 			}
943 			id = malloc(sizeof(*id));
944 			if (id == NULL) {
945 				err = got_error_from_errno("malloc");
946 				goto done;
947 			}
948 			memcpy(id, &iremote_ref.id, sizeof(*id));
949 			refname = strndup(imsg.data + sizeof(iremote_ref),
950 			    datalen - sizeof(iremote_ref));
951 			if (refname == NULL) {
952 				err = got_error_from_errno("strndup");
953 				goto done;
954 			}
955 			err = got_pathlist_insert(&new, remote_refs,
956 			    refname, id);
957 			if (err)
958 				goto done;
959 			if (new == NULL) { /* duplicate which wasn't inserted */
960 				free(id);
961 				free(refname);
962 			}
963 			id = NULL;
964 			refname = NULL;
965 			break;
966 		case GOT_IMSG_SEND_PACK_REQUEST:
967 			if (datalen != 0) {
968 				err = got_error(GOT_ERR_PRIVSEP_MSG);
969 				goto done;
970 			}
971 			/* got-send-pack is now waiting for a pack file. */
972 			done = 1;
973 			break;
974 		default:
975 			err = got_error(GOT_ERR_PRIVSEP_MSG);
976 			break;
977 		}
978 	}
979 done:
980 	free(id);
981 	free(refname);
982 	imsg_free(&imsg);
983 	return err;
984 }
985 
986 const struct got_error *
987 got_privsep_send_packfd(struct imsgbuf *ibuf, int fd)
988 {
989 	return send_fd(ibuf, GOT_IMSG_SEND_PACKFD, fd);
990 }
991 
992 const struct got_error *
993 got_privsep_recv_send_progress(int *done, off_t *bytes_sent,
994     int *success, char **refname, char **errmsg, struct imsgbuf *ibuf)
995 {
996 	const struct got_error *err = NULL;
997 	struct imsg imsg;
998 	size_t datalen;
999 	struct got_imsg_send_ref_status iref_status;
1000 
1001 	/* Do not reset the current value of 'bytes_sent', it accumulates. */
1002 	*done = 0;
1003 	*success = 0;
1004 	*refname = NULL;
1005 	*errmsg = NULL;
1006 
1007 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1008 	if (err)
1009 		return err;
1010 
1011 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1012 	switch (imsg.hdr.type) {
1013 	case GOT_IMSG_SEND_UPLOAD_PROGRESS:
1014 		if (datalen < sizeof(*bytes_sent)) {
1015 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1016 			break;
1017 		}
1018 		memcpy(bytes_sent, imsg.data, sizeof(*bytes_sent));
1019 		break;
1020 	case GOT_IMSG_SEND_REF_STATUS:
1021 		if (datalen < sizeof(iref_status)) {
1022 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1023 			break;
1024 		}
1025 		memcpy(&iref_status, imsg.data, sizeof(iref_status));
1026 		if (datalen != sizeof(iref_status) + iref_status.name_len +
1027 		    iref_status.errmsg_len) {
1028 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1029 			break;
1030 		}
1031 		*success = iref_status.success;
1032 		*refname = strndup(imsg.data + sizeof(iref_status),
1033 		    iref_status.name_len);
1034 
1035 		if (iref_status.errmsg_len != 0)
1036 			*errmsg = strndup(imsg.data + sizeof(iref_status) +
1037 			    iref_status.name_len, iref_status.errmsg_len);
1038 		break;
1039 	case GOT_IMSG_SEND_DONE:
1040 		if (datalen != 0) {
1041 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1042 			break;
1043 		}
1044 		*done = 1;
1045 		break;
1046 	default:
1047 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1048 		break;
1049 	}
1050 
1051 	imsg_free(&imsg);
1052 	return err;
1053 }
1054 
1055 const struct got_error *
1056 got_privsep_send_index_pack_req(struct imsgbuf *ibuf, uint8_t *pack_sha1,
1057     int fd)
1058 {
1059 	const struct got_error *err = NULL;
1060 
1061 	/* Keep in sync with struct got_imsg_index_pack_request */
1062 	if (imsg_compose(ibuf, GOT_IMSG_IDXPACK_REQUEST, 0, 0, fd,
1063 	    pack_sha1, SHA1_DIGEST_LENGTH) == -1) {
1064 		err = got_error_from_errno("imsg_compose INDEX_REQUEST");
1065 		close(fd);
1066 		return err;
1067 	}
1068 	return flush_imsg(ibuf);
1069 }
1070 
1071 const struct got_error *
1072 got_privsep_send_index_pack_outfd(struct imsgbuf *ibuf, int fd)
1073 {
1074 	return send_fd(ibuf, GOT_IMSG_IDXPACK_OUTFD, fd);
1075 }
1076 
1077 const struct got_error *
1078 got_privsep_recv_index_progress(int *done, int *nobj_total,
1079     int *nobj_indexed, int *nobj_loose, int *nobj_resolved,
1080     struct imsgbuf *ibuf)
1081 {
1082 	const struct got_error *err = NULL;
1083 	struct imsg imsg;
1084 	struct got_imsg_index_pack_progress *iprogress;
1085 	size_t datalen;
1086 
1087 	*done = 0;
1088 	*nobj_total = 0;
1089 	*nobj_indexed = 0;
1090 	*nobj_resolved = 0;
1091 
1092 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1093 	if (err)
1094 		return err;
1095 
1096 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1097 	switch (imsg.hdr.type) {
1098 	case GOT_IMSG_IDXPACK_PROGRESS:
1099 		if (datalen < sizeof(*iprogress)) {
1100 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1101 			break;
1102 		}
1103 		iprogress = (struct got_imsg_index_pack_progress *)imsg.data;
1104 		if (iprogress->nobj_total < 0 || iprogress->nobj_indexed < 0 ||
1105 		    iprogress->nobj_loose < 0 || iprogress->nobj_resolved < 0) {
1106 			err = got_error(GOT_ERR_RANGE);
1107 			break;
1108 		}
1109 		*nobj_total = iprogress->nobj_total;
1110 		*nobj_indexed = iprogress->nobj_indexed;
1111 		*nobj_loose = iprogress->nobj_loose;
1112 		*nobj_resolved = iprogress->nobj_resolved;
1113 		break;
1114 	case GOT_IMSG_IDXPACK_DONE:
1115 		if (datalen != 0) {
1116 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1117 			break;
1118 		}
1119 		*done = 1;
1120 		break;
1121 	default:
1122 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1123 		break;
1124 	}
1125 
1126 	imsg_free(&imsg);
1127 	return err;
1128 }
1129 
1130 const struct got_error *
1131 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
1132     struct imsgbuf *ibuf)
1133 {
1134 	struct got_imsg_object *iobj;
1135 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1136 
1137 	if (datalen != sizeof(*iobj))
1138 		return got_error(GOT_ERR_PRIVSEP_LEN);
1139 	iobj = imsg->data;
1140 
1141 	if (iobj->pack_offset < 0)
1142 		return got_error(GOT_ERR_PACK_OFFSET);
1143 
1144 	*obj = calloc(1, sizeof(**obj));
1145 	if (*obj == NULL)
1146 		return got_error_from_errno("calloc");
1147 
1148 	memcpy(&(*obj)->id, &iobj->id, sizeof(iobj->id));
1149 	(*obj)->type = iobj->type;
1150 	(*obj)->flags = iobj->flags;
1151 	(*obj)->hdrlen = iobj->hdrlen;
1152 	(*obj)->size = iobj->size;
1153 	/* path_packfile is handled by caller */
1154 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
1155 		(*obj)->pack_offset = iobj->pack_offset;
1156 		(*obj)->pack_idx = iobj->pack_idx;
1157 	}
1158 	STAILQ_INIT(&(*obj)->deltas.entries);
1159 	return NULL;
1160 }
1161 
1162 const struct got_error *
1163 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
1164 {
1165 	const struct got_error *err = NULL;
1166 	struct imsg imsg;
1167 	const size_t min_datalen =
1168 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
1169 
1170 	*obj = NULL;
1171 
1172 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1173 	if (err)
1174 		return err;
1175 
1176 	switch (imsg.hdr.type) {
1177 	case GOT_IMSG_OBJECT:
1178 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
1179 		break;
1180 	default:
1181 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1182 		break;
1183 	}
1184 
1185 	imsg_free(&imsg);
1186 
1187 	return err;
1188 }
1189 
1190 static const struct got_error *
1191 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
1192     size_t logmsg_len)
1193 {
1194 	const struct got_error *err = NULL;
1195 	size_t offset, remain;
1196 
1197 	offset = 0;
1198 	remain = logmsg_len;
1199 	while (remain > 0) {
1200 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1201 
1202 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
1203 		    commit->logmsg + offset, n) == -1) {
1204 			err = got_error_from_errno("imsg_compose "
1205 			    "COMMIT_LOGMSG");
1206 			break;
1207 		}
1208 
1209 		err = flush_imsg(ibuf);
1210 		if (err)
1211 			break;
1212 
1213 		offset += n;
1214 		remain -= n;
1215 	}
1216 
1217 	return err;
1218 }
1219 
1220 const struct got_error *
1221 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
1222 {
1223 	const struct got_error *err = NULL;
1224 	struct got_imsg_commit_object *icommit;
1225 	uint8_t *buf;
1226 	size_t len, total;
1227 	struct got_object_qid *qid;
1228 	size_t author_len = strlen(commit->author);
1229 	size_t committer_len = strlen(commit->committer);
1230 	size_t logmsg_len = strlen(commit->logmsg);
1231 
1232 	total = sizeof(*icommit) + author_len + committer_len +
1233 	    commit->nparents * sizeof(struct got_object_id);
1234 
1235 	buf = malloc(total);
1236 	if (buf == NULL)
1237 		return got_error_from_errno("malloc");
1238 
1239 	icommit = (struct got_imsg_commit_object *)buf;
1240 	memcpy(&icommit->tree_id, commit->tree_id, sizeof(icommit->tree_id));
1241 	icommit->author_len = author_len;
1242 	icommit->author_time = commit->author_time;
1243 	icommit->author_gmtoff = commit->author_gmtoff;
1244 	icommit->committer_len = committer_len;
1245 	icommit->committer_time = commit->committer_time;
1246 	icommit->committer_gmtoff = commit->committer_gmtoff;
1247 	icommit->logmsg_len = logmsg_len;
1248 	icommit->nparents = commit->nparents;
1249 
1250 	len = sizeof(*icommit);
1251 	memcpy(buf + len, commit->author, author_len);
1252 	len += author_len;
1253 	memcpy(buf + len, commit->committer, committer_len);
1254 	len += committer_len;
1255 	STAILQ_FOREACH(qid, &commit->parent_ids, entry) {
1256 		memcpy(buf + len, &qid->id, sizeof(qid->id));
1257 		len += sizeof(qid->id);
1258 	}
1259 
1260 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
1261 		err = got_error_from_errno("imsg_compose COMMIT");
1262 		goto done;
1263 	}
1264 
1265 	if (logmsg_len == 0 ||
1266 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1267 		err = flush_imsg(ibuf);
1268 		if (err)
1269 			goto done;
1270 	}
1271 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
1272 done:
1273 	free(buf);
1274 	return err;
1275 }
1276 
1277 static const struct got_error *
1278 get_commit_from_imsg(struct got_commit_object **commit,
1279     struct imsg *imsg, size_t datalen, struct imsgbuf *ibuf)
1280 {
1281 	const struct got_error *err = NULL;
1282 	struct got_imsg_commit_object *icommit;
1283 	size_t len = 0;
1284 	int i;
1285 
1286 	if (datalen < sizeof(*icommit))
1287 		return got_error(GOT_ERR_PRIVSEP_LEN);
1288 
1289 	icommit = imsg->data;
1290 	if (datalen != sizeof(*icommit) + icommit->author_len +
1291 	    icommit->committer_len +
1292 	    icommit->nparents * sizeof(struct got_object_id))
1293 		return got_error(GOT_ERR_PRIVSEP_LEN);
1294 
1295 	if (icommit->nparents < 0)
1296 		return got_error(GOT_ERR_PRIVSEP_LEN);
1297 
1298 	len += sizeof(*icommit);
1299 
1300 	*commit = got_object_commit_alloc_partial();
1301 	if (*commit == NULL)
1302 		return got_error_from_errno(
1303 		    "got_object_commit_alloc_partial");
1304 
1305 	memcpy((*commit)->tree_id, &icommit->tree_id,
1306 	    sizeof(icommit->tree_id));
1307 	(*commit)->author_time = icommit->author_time;
1308 	(*commit)->author_gmtoff = icommit->author_gmtoff;
1309 	(*commit)->committer_time = icommit->committer_time;
1310 	(*commit)->committer_gmtoff = icommit->committer_gmtoff;
1311 
1312 	(*commit)->author = strndup(imsg->data + len, icommit->author_len);
1313 	if ((*commit)->author == NULL) {
1314 		err = got_error_from_errno("strndup");
1315 		goto done;
1316 	}
1317 	len += icommit->author_len;
1318 
1319 	(*commit)->committer = strndup(imsg->data + len,
1320 	    icommit->committer_len);
1321 	if ((*commit)->committer == NULL) {
1322 		err = got_error_from_errno("strndup");
1323 		goto done;
1324 	}
1325 	len += icommit->committer_len;
1326 
1327 	if (icommit->logmsg_len == 0) {
1328 		(*commit)->logmsg = strdup("");
1329 		if ((*commit)->logmsg == NULL) {
1330 			err = got_error_from_errno("strdup");
1331 			goto done;
1332 		}
1333 	} else {
1334 		size_t offset = 0, remain = icommit->logmsg_len;
1335 
1336 		(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
1337 		if ((*commit)->logmsg == NULL) {
1338 			err = got_error_from_errno("malloc");
1339 			goto done;
1340 		}
1341 		while (remain > 0) {
1342 			struct imsg imsg_log;
1343 			size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1344 			    remain);
1345 
1346 			err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1347 			if (err)
1348 				goto done;
1349 
1350 			if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG) {
1351 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1352 				goto done;
1353 			}
1354 
1355 			memcpy((*commit)->logmsg + offset,
1356 			    imsg_log.data, n);
1357 			imsg_free(&imsg_log);
1358 			offset += n;
1359 			remain -= n;
1360 		}
1361 		(*commit)->logmsg[icommit->logmsg_len] = '\0';
1362 	}
1363 
1364 	for (i = 0; i < icommit->nparents; i++) {
1365 		struct got_object_qid *qid;
1366 
1367 		err = got_object_qid_alloc_partial(&qid);
1368 		if (err)
1369 			break;
1370 		memcpy(&qid->id, imsg->data + len +
1371 		    i * sizeof(qid->id), sizeof(qid->id));
1372 		STAILQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
1373 		(*commit)->nparents++;
1374 	}
1375 done:
1376 	if (err) {
1377 		got_object_commit_close(*commit);
1378 		*commit = NULL;
1379 	}
1380 	return err;
1381 }
1382 
1383 const struct got_error *
1384 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
1385 {
1386 	const struct got_error *err = NULL;
1387 	struct imsg imsg;
1388 	size_t datalen;
1389 	const size_t min_datalen =
1390 	    MIN(sizeof(struct got_imsg_error),
1391 	    sizeof(struct got_imsg_commit_object));
1392 
1393 	*commit = NULL;
1394 
1395 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1396 	if (err)
1397 		return err;
1398 
1399 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1400 
1401 	switch (imsg.hdr.type) {
1402 	case GOT_IMSG_COMMIT:
1403 		err = get_commit_from_imsg(commit, &imsg, datalen, ibuf);
1404 		break;
1405 	default:
1406 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1407 		break;
1408 	}
1409 
1410 	imsg_free(&imsg);
1411 
1412 	return err;
1413 }
1414 
1415 static const struct got_error *
1416 send_tree_entries_batch(struct imsgbuf *ibuf,
1417     struct got_parsed_tree_entry *entries, int idx0, int idxN, size_t len)
1418 {
1419 	struct ibuf *wbuf;
1420 	struct got_imsg_tree_entries ientries;
1421 	int i;
1422 
1423 	memset(&ientries, 0, sizeof(ientries));
1424 
1425 	wbuf = imsg_create(ibuf, GOT_IMSG_TREE_ENTRIES, 0, 0, len);
1426 	if (wbuf == NULL)
1427 		return got_error_from_errno("imsg_create TREE_ENTRY");
1428 
1429 	ientries.nentries = idxN - idx0 + 1;
1430 	if (imsg_add(wbuf, &ientries, sizeof(ientries)) == -1)
1431 		return got_error_from_errno("imsg_add TREE_ENTRY");
1432 
1433 	for (i = idx0; i <= idxN; i++) {
1434 		struct got_parsed_tree_entry *pte = &entries[i];
1435 
1436 		/* Keep in sync with struct got_imsg_tree_entry definition! */
1437 		if (imsg_add(wbuf, pte->id, SHA1_DIGEST_LENGTH) == -1)
1438 			return got_error_from_errno("imsg_add TREE_ENTRY");
1439 		if (imsg_add(wbuf, &pte->mode, sizeof(pte->mode)) == -1)
1440 			return got_error_from_errno("imsg_add TREE_ENTRY");
1441 		if (imsg_add(wbuf, &pte->namelen, sizeof(pte->namelen)) == -1)
1442 			return got_error_from_errno("imsg_add TREE_ENTRY");
1443 
1444 		/* Remaining bytes are the entry's name. */
1445 		if (imsg_add(wbuf, pte->name, pte->namelen) == -1)
1446 			return got_error_from_errno("imsg_add TREE_ENTRY");
1447 	}
1448 
1449 	wbuf->fd = -1;
1450 	imsg_close(ibuf, wbuf);
1451 	return NULL;
1452 }
1453 
1454 static const struct got_error *
1455 send_tree_entries(struct imsgbuf *ibuf, struct got_parsed_tree_entry *entries,
1456     int nentries)
1457 {
1458 	const struct got_error *err = NULL;
1459 	int i, j;
1460 	size_t entries_len = sizeof(struct got_imsg_tree_entries);
1461 
1462 	i = 0;
1463 	for (j = 0; j < nentries; j++) {
1464 		struct got_parsed_tree_entry *pte = &entries[j];
1465 		size_t len = sizeof(struct got_imsg_tree_entry) + pte->namelen;
1466 
1467 		if (j > 0 &&
1468 		    entries_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1469 			err = send_tree_entries_batch(ibuf, entries,
1470 			    i, j - 1, entries_len);
1471 			if (err)
1472 				return err;
1473 			i = j;
1474 			entries_len = sizeof(struct got_imsg_tree_entries);
1475 		}
1476 
1477 		entries_len += len;
1478 	}
1479 
1480 	if (j > 0) {
1481 		err = send_tree_entries_batch(ibuf, entries, i, j - 1,
1482 		    entries_len);
1483 		if (err)
1484 			return err;
1485 	}
1486 
1487 	return NULL;
1488 }
1489 
1490 const struct got_error *
1491 got_privsep_send_tree(struct imsgbuf *ibuf,
1492     struct got_parsed_tree_entry *entries, int nentries)
1493 {
1494 	const struct got_error *err = NULL;
1495 	struct got_imsg_tree_object itree;
1496 
1497 	memset(&itree, 0, sizeof(itree));
1498 	itree.nentries = nentries;
1499 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
1500 	    == -1)
1501 		return got_error_from_errno("imsg_compose TREE");
1502 
1503 	err = send_tree_entries(ibuf, entries, nentries);
1504 	if (err)
1505 		return err;
1506 
1507 	return flush_imsg(ibuf);
1508 }
1509 
1510 
1511 static const struct got_error *
1512 recv_tree_entries(void *data, size_t datalen, struct got_tree_object *tree,
1513     int *nentries)
1514 {
1515 	const struct got_error *err = NULL;
1516 	struct got_imsg_tree_entries *ientries;
1517 	struct got_tree_entry *te;
1518 	size_t te_offset;
1519 	size_t i;
1520 
1521 	if (datalen <= sizeof(*ientries) ||
1522 	    datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
1523 		return got_error(GOT_ERR_PRIVSEP_LEN);
1524 
1525 	ientries = (struct got_imsg_tree_entries *)data;
1526 	if (ientries->nentries > INT_MAX) {
1527 		return got_error_msg(GOT_ERR_NO_SPACE,
1528 		    "too many tree entries");
1529 	}
1530 
1531 	te_offset = sizeof(*ientries);
1532 	for (i = 0; i < ientries->nentries; i++) {
1533 		struct got_imsg_tree_entry ite;
1534 		const char *te_name;
1535 		uint8_t *buf = (uint8_t *)data + te_offset;
1536 
1537 		if (te_offset >= datalen) {
1538 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1539 			break;
1540 		}
1541 
1542 		/* Might not be aligned, size is ~32 bytes. */
1543 		memcpy(&ite, buf, sizeof(ite));
1544 
1545 		if (ite.namelen >= sizeof(te->name)) {
1546 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1547 			break;
1548 		}
1549 		if (te_offset + sizeof(ite) + ite.namelen > datalen) {
1550 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1551 			break;
1552 		}
1553 
1554 		if (*nentries >= tree->nentries) {
1555 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1556 			break;
1557 		}
1558 		te = &tree->entries[*nentries];
1559 		te_name = buf + sizeof(ite);
1560 		memcpy(te->name, te_name, ite.namelen);
1561 		te->name[ite.namelen] = '\0';
1562 		memcpy(te->id.sha1, ite.id, SHA1_DIGEST_LENGTH);
1563 		te->mode = ite.mode;
1564 		te->idx = *nentries;
1565 		(*nentries)++;
1566 
1567 		te_offset += sizeof(ite) + ite.namelen;
1568 	}
1569 
1570 	return err;
1571 }
1572 
1573 const struct got_error *
1574 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
1575 {
1576 	const struct got_error *err = NULL;
1577 	const size_t min_datalen =
1578 	    MIN(sizeof(struct got_imsg_error),
1579 	    sizeof(struct got_imsg_tree_object));
1580 	struct got_imsg_tree_object *itree;
1581 	int nentries = 0;
1582 
1583 	*tree = NULL;
1584 
1585 	while (*tree == NULL || nentries < (*tree)->nentries) {
1586 		struct imsg imsg;
1587 		size_t datalen;
1588 
1589 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1590 		if (err)
1591 			break;
1592 
1593 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1594 
1595 		switch (imsg.hdr.type) {
1596 		case GOT_IMSG_TREE:
1597 			/* This message should only appear once. */
1598 			if (*tree != NULL) {
1599 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1600 				break;
1601 			}
1602 			if (datalen != sizeof(*itree)) {
1603 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1604 				break;
1605 			}
1606 			itree = imsg.data;
1607 			if (itree->nentries < 0) {
1608 				err = got_error(GOT_ERR_PRIVSEP_LEN);
1609 				break;
1610 			}
1611 			*tree = malloc(sizeof(**tree));
1612 			if (*tree == NULL) {
1613 				err = got_error_from_errno("malloc");
1614 				break;
1615 			}
1616 			(*tree)->entries = calloc(itree->nentries,
1617 			    sizeof(struct got_tree_entry));
1618 			if ((*tree)->entries == NULL) {
1619 				err = got_error_from_errno("malloc");
1620 				free(*tree);
1621 				*tree = NULL;
1622 				break;
1623 			}
1624 			(*tree)->nentries = itree->nentries;
1625 			(*tree)->refcnt = 0;
1626 			break;
1627 		case GOT_IMSG_TREE_ENTRIES:
1628 			/* This message should be preceeded by GOT_IMSG_TREE. */
1629 			if (*tree == NULL) {
1630 				err = got_error(GOT_ERR_PRIVSEP_MSG);
1631 				break;
1632 			}
1633 			err = recv_tree_entries(imsg.data, datalen,
1634 			    *tree, &nentries);
1635 			break;
1636 		default:
1637 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1638 			break;
1639 		}
1640 
1641 		imsg_free(&imsg);
1642 		if (err)
1643 			break;
1644 	}
1645 
1646 	if (*tree && (*tree)->nentries != nentries) {
1647 		if (err == NULL)
1648 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1649 		got_object_tree_close(*tree);
1650 		*tree = NULL;
1651 	}
1652 
1653 	return err;
1654 }
1655 
1656 const struct got_error *
1657 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size, size_t hdrlen,
1658     const uint8_t *data)
1659 {
1660 	struct got_imsg_blob iblob;
1661 
1662 	memset(&iblob, 0, sizeof(iblob));
1663 	iblob.size = size;
1664 	iblob.hdrlen = hdrlen;
1665 
1666 	if (data) {
1667 		uint8_t *buf;
1668 
1669 		if (size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX)
1670 			return got_error(GOT_ERR_NO_SPACE);
1671 
1672 		buf = malloc(sizeof(iblob) + size);
1673 		if (buf == NULL)
1674 			return got_error_from_errno("malloc");
1675 
1676 		memcpy(buf, &iblob, sizeof(iblob));
1677 		memcpy(buf + sizeof(iblob), data, size);
1678 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, buf,
1679 		    sizeof(iblob) + size) == -1) {
1680 			free(buf);
1681 			return got_error_from_errno("imsg_compose BLOB");
1682 		}
1683 		free(buf);
1684 	} else {
1685 		/* Data has already been written to file descriptor. */
1686 		if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob,
1687 		    sizeof(iblob)) == -1)
1688 			return got_error_from_errno("imsg_compose BLOB");
1689 	}
1690 
1691 
1692 	return flush_imsg(ibuf);
1693 }
1694 
1695 const struct got_error *
1696 got_privsep_recv_blob(uint8_t **outbuf, size_t *size, size_t *hdrlen,
1697     struct imsgbuf *ibuf)
1698 {
1699 	const struct got_error *err = NULL;
1700 	struct imsg imsg;
1701 	struct got_imsg_blob *iblob;
1702 	size_t datalen;
1703 
1704 	*outbuf = NULL;
1705 
1706 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
1707 	if (err)
1708 		return err;
1709 
1710 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1711 
1712 	switch (imsg.hdr.type) {
1713 	case GOT_IMSG_BLOB:
1714 		if (datalen < sizeof(*iblob)) {
1715 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1716 			break;
1717 		}
1718 		iblob = imsg.data;
1719 		*size = iblob->size;
1720 		*hdrlen = iblob->hdrlen;
1721 
1722 		if (datalen == sizeof(*iblob)) {
1723 			/* Data has been written to file descriptor. */
1724 			break;
1725 		}
1726 
1727 		if (*size > GOT_PRIVSEP_INLINE_BLOB_DATA_MAX ||
1728 		    *size > datalen + sizeof(*iblob)) {
1729 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1730 			break;
1731 		}
1732 
1733 		*outbuf = malloc(*size);
1734 		if (*outbuf == NULL) {
1735 			err = got_error_from_errno("malloc");
1736 			break;
1737 		}
1738 		memcpy(*outbuf, imsg.data + sizeof(*iblob), *size);
1739 		break;
1740 	default:
1741 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1742 		break;
1743 	}
1744 
1745 	imsg_free(&imsg);
1746 
1747 	return err;
1748 }
1749 
1750 static const struct got_error *
1751 send_tagmsg(struct imsgbuf *ibuf, struct got_tag_object *tag, size_t tagmsg_len)
1752 {
1753 	const struct got_error *err = NULL;
1754 	size_t offset, remain;
1755 
1756 	offset = 0;
1757 	remain = tagmsg_len;
1758 	while (remain > 0) {
1759 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
1760 
1761 		if (imsg_compose(ibuf, GOT_IMSG_TAG_TAGMSG, 0, 0, -1,
1762 		    tag->tagmsg + offset, n) == -1) {
1763 			err = got_error_from_errno("imsg_compose TAG_TAGMSG");
1764 			break;
1765 		}
1766 
1767 		err = flush_imsg(ibuf);
1768 		if (err)
1769 			break;
1770 
1771 		offset += n;
1772 		remain -= n;
1773 	}
1774 
1775 	return err;
1776 }
1777 
1778 const struct got_error *
1779 got_privsep_send_tag(struct imsgbuf *ibuf, struct got_tag_object *tag)
1780 {
1781 	const struct got_error *err = NULL;
1782 	struct got_imsg_tag_object *itag;
1783 	uint8_t *buf;
1784 	size_t len, total;
1785 	size_t tag_len = strlen(tag->tag);
1786 	size_t tagger_len = strlen(tag->tagger);
1787 	size_t tagmsg_len = strlen(tag->tagmsg);
1788 
1789 	total = sizeof(*itag) + tag_len + tagger_len + tagmsg_len;
1790 
1791 	buf = malloc(total);
1792 	if (buf == NULL)
1793 		return got_error_from_errno("malloc");
1794 
1795 	itag = (struct got_imsg_tag_object *)buf;
1796 	memcpy(&itag->id, &tag->id, sizeof(itag->id));
1797 	itag->obj_type = tag->obj_type;
1798 	itag->tag_len = tag_len;
1799 	itag->tagger_len = tagger_len;
1800 	itag->tagger_time = tag->tagger_time;
1801 	itag->tagger_gmtoff = tag->tagger_gmtoff;
1802 	itag->tagmsg_len = tagmsg_len;
1803 
1804 	len = sizeof(*itag);
1805 	memcpy(buf + len, tag->tag, tag_len);
1806 	len += tag_len;
1807 	memcpy(buf + len, tag->tagger, tagger_len);
1808 	len += tagger_len;
1809 
1810 	if (imsg_compose(ibuf, GOT_IMSG_TAG, 0, 0, -1, buf, len) == -1) {
1811 		err = got_error_from_errno("imsg_compose TAG");
1812 		goto done;
1813 	}
1814 
1815 	if (tagmsg_len == 0 ||
1816 	    tagmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
1817 		err = flush_imsg(ibuf);
1818 		if (err)
1819 			goto done;
1820 	}
1821 	err = send_tagmsg(ibuf, tag, tagmsg_len);
1822 done:
1823 	free(buf);
1824 	return err;
1825 }
1826 
1827 const struct got_error *
1828 got_privsep_recv_tag(struct got_tag_object **tag, struct imsgbuf *ibuf)
1829 {
1830 	const struct got_error *err = NULL;
1831 	struct imsg imsg;
1832 	struct got_imsg_tag_object *itag;
1833 	size_t len, datalen;
1834 	const size_t min_datalen =
1835 	    MIN(sizeof(struct got_imsg_error),
1836 	    sizeof(struct got_imsg_tag_object));
1837 
1838 	*tag = NULL;
1839 
1840 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
1841 	if (err)
1842 		return err;
1843 
1844 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1845 	len = 0;
1846 
1847 	switch (imsg.hdr.type) {
1848 	case GOT_IMSG_TAG:
1849 		if (datalen < sizeof(*itag)) {
1850 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1851 			break;
1852 		}
1853 		itag = imsg.data;
1854 		if (datalen != sizeof(*itag) + itag->tag_len +
1855 		    itag->tagger_len) {
1856 			err = got_error(GOT_ERR_PRIVSEP_LEN);
1857 			break;
1858 		}
1859 		len += sizeof(*itag);
1860 
1861 		*tag = calloc(1, sizeof(**tag));
1862 		if (*tag == NULL) {
1863 			err = got_error_from_errno("calloc");
1864 			break;
1865 		}
1866 
1867 		memcpy(&(*tag)->id, &itag->id, sizeof(itag->id));
1868 
1869 		(*tag)->tag = strndup(imsg.data + len, itag->tag_len);
1870 		if ((*tag)->tag == NULL) {
1871 			err = got_error_from_errno("strndup");
1872 			break;
1873 		}
1874 		len += itag->tag_len;
1875 
1876 		(*tag)->obj_type = itag->obj_type;
1877 		(*tag)->tagger_time = itag->tagger_time;
1878 		(*tag)->tagger_gmtoff = itag->tagger_gmtoff;
1879 
1880 		(*tag)->tagger = strndup(imsg.data + len, itag->tagger_len);
1881 		if ((*tag)->tagger == NULL) {
1882 			err = got_error_from_errno("strndup");
1883 			break;
1884 		}
1885 		len += itag->tagger_len;
1886 
1887 		if (itag->tagmsg_len == 0) {
1888 			(*tag)->tagmsg = strdup("");
1889 			if ((*tag)->tagmsg == NULL) {
1890 				err = got_error_from_errno("strdup");
1891 				break;
1892 			}
1893 		} else {
1894 			size_t offset = 0, remain = itag->tagmsg_len;
1895 
1896 			(*tag)->tagmsg = malloc(itag->tagmsg_len + 1);
1897 			if ((*tag)->tagmsg == NULL) {
1898 				err = got_error_from_errno("malloc");
1899 				break;
1900 			}
1901 			while (remain > 0) {
1902 				struct imsg imsg_log;
1903 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
1904 				    remain);
1905 
1906 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
1907 				if (err)
1908 					return err;
1909 
1910 				if (imsg_log.hdr.type != GOT_IMSG_TAG_TAGMSG)
1911 					return got_error(GOT_ERR_PRIVSEP_MSG);
1912 
1913 				memcpy((*tag)->tagmsg + offset, imsg_log.data,
1914 				    n);
1915 				imsg_free(&imsg_log);
1916 				offset += n;
1917 				remain -= n;
1918 			}
1919 			(*tag)->tagmsg[itag->tagmsg_len] = '\0';
1920 		}
1921 
1922 		break;
1923 	default:
1924 		err = got_error(GOT_ERR_PRIVSEP_MSG);
1925 		break;
1926 	}
1927 
1928 	imsg_free(&imsg);
1929 
1930 	return err;
1931 }
1932 
1933 const struct got_error *
1934 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
1935     struct got_packidx *packidx)
1936 {
1937 	const struct got_error *err = NULL;
1938 	struct got_imsg_packidx ipackidx;
1939 	struct got_imsg_pack ipack;
1940 	int fd;
1941 
1942 	memset(&ipackidx, 0, sizeof(ipackidx));
1943 	memset(&ipack, 0, sizeof(ipack));
1944 
1945 	ipackidx.len = packidx->len;
1946 	ipackidx.packfile_size = pack->filesize;
1947 	fd = dup(packidx->fd);
1948 	if (fd == -1)
1949 		return got_error_from_errno("dup");
1950 
1951 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
1952 	    sizeof(ipackidx)) == -1) {
1953 		err = got_error_from_errno("imsg_compose PACKIDX");
1954 		close(fd);
1955 		return err;
1956 	}
1957 
1958 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
1959 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
1960 		return got_error(GOT_ERR_NO_SPACE);
1961 	ipack.filesize = pack->filesize;
1962 
1963 	fd = dup(pack->fd);
1964 	if (fd == -1)
1965 		return got_error_from_errno("dup");
1966 
1967 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
1968 	    == -1) {
1969 		err = got_error_from_errno("imsg_compose PACK");
1970 		close(fd);
1971 		return err;
1972 	}
1973 
1974 	return flush_imsg(ibuf);
1975 }
1976 
1977 const struct got_error *
1978 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
1979     struct got_object_id *id)
1980 {
1981 	struct got_imsg_packed_object iobj;
1982 
1983 	memset(&iobj, 0, sizeof(iobj));
1984 	iobj.idx = idx;
1985 	memcpy(&iobj.id, id, sizeof(iobj.id));
1986 
1987 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
1988 	    &iobj, sizeof(iobj)) == -1)
1989 		return got_error_from_errno("imsg_compose "
1990 		    "PACKED_OBJECT_REQUEST");
1991 
1992 	return flush_imsg(ibuf);
1993 }
1994 
1995 const struct got_error *
1996 got_privsep_send_packed_raw_obj_req(struct imsgbuf *ibuf, int idx,
1997     struct got_object_id *id)
1998 {
1999 	struct got_imsg_packed_object iobj;
2000 
2001 	memset(&iobj, 0, sizeof(iobj));
2002 	iobj.idx = idx;
2003 	memcpy(&iobj.id, id, sizeof(iobj.id));
2004 
2005 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_RAW_OBJECT_REQUEST, 0, 0, -1,
2006 	    &iobj, sizeof(iobj)) == -1)
2007 		return got_error_from_errno("imsg_compose "
2008 		    "PACKED_OBJECT_REQUEST");
2009 
2010 	return flush_imsg(ibuf);
2011 }
2012 
2013 const struct got_error *
2014 got_privsep_send_gitconfig_parse_req(struct imsgbuf *ibuf, int fd)
2015 {
2016 	const struct got_error *err = NULL;
2017 
2018 	if (imsg_compose(ibuf, GOT_IMSG_GITCONFIG_PARSE_REQUEST, 0, 0, fd,
2019 	    NULL, 0) == -1) {
2020 		err = got_error_from_errno("imsg_compose "
2021 		    "GITCONFIG_PARSE_REQUEST");
2022 		close(fd);
2023 		return err;
2024 	}
2025 
2026 	return flush_imsg(ibuf);
2027 }
2028 
2029 const struct got_error *
2030 got_privsep_send_gitconfig_repository_format_version_req(struct imsgbuf *ibuf)
2031 {
2032 	if (imsg_compose(ibuf,
2033 	    GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST, 0, 0, -1,
2034 	    NULL, 0) == -1)
2035 		return got_error_from_errno("imsg_compose "
2036 		    "GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST");
2037 
2038 	return flush_imsg(ibuf);
2039 }
2040 
2041 const struct got_error *
2042 got_privsep_send_gitconfig_repository_extensions_req(struct imsgbuf *ibuf)
2043 {
2044 	if (imsg_compose(ibuf,
2045 	    GOT_IMSG_GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST, 0, 0, -1,
2046 	    NULL, 0) == -1)
2047 		return got_error_from_errno("imsg_compose "
2048 		    "GITCONFIG_REPOSITORY_EXTENSIONS_REQUEST");
2049 
2050 	return flush_imsg(ibuf);
2051 }
2052 
2053 
2054 const struct got_error *
2055 got_privsep_send_gitconfig_author_name_req(struct imsgbuf *ibuf)
2056 {
2057 	if (imsg_compose(ibuf,
2058 	    GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST, 0, 0, -1, NULL, 0) == -1)
2059 		return got_error_from_errno("imsg_compose "
2060 		    "GITCONFIG_AUTHOR_NAME_REQUEST");
2061 
2062 	return flush_imsg(ibuf);
2063 }
2064 
2065 const struct got_error *
2066 got_privsep_send_gitconfig_author_email_req(struct imsgbuf *ibuf)
2067 {
2068 	if (imsg_compose(ibuf,
2069 	    GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST, 0, 0, -1, NULL, 0) == -1)
2070 		return got_error_from_errno("imsg_compose "
2071 		    "GITCONFIG_AUTHOR_EMAIL_REQUEST");
2072 
2073 	return flush_imsg(ibuf);
2074 }
2075 
2076 const struct got_error *
2077 got_privsep_send_gitconfig_remotes_req(struct imsgbuf *ibuf)
2078 {
2079 	if (imsg_compose(ibuf,
2080 	    GOT_IMSG_GITCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2081 		return got_error_from_errno("imsg_compose "
2082 		    "GITCONFIG_REMOTE_REQUEST");
2083 
2084 	return flush_imsg(ibuf);
2085 }
2086 
2087 const struct got_error *
2088 got_privsep_send_gitconfig_owner_req(struct imsgbuf *ibuf)
2089 {
2090 	if (imsg_compose(ibuf,
2091 	    GOT_IMSG_GITCONFIG_OWNER_REQUEST, 0, 0, -1, NULL, 0) == -1)
2092 		return got_error_from_errno("imsg_compose "
2093 		    "GITCONFIG_OWNER_REQUEST");
2094 
2095 	return flush_imsg(ibuf);
2096 }
2097 
2098 const struct got_error *
2099 got_privsep_recv_gitconfig_str(char **str, struct imsgbuf *ibuf)
2100 {
2101 	const struct got_error *err = NULL;
2102 	struct imsg imsg;
2103 	size_t datalen;
2104 
2105 	*str = NULL;
2106 
2107 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2108 	if (err)
2109 		return err;
2110 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2111 
2112 	switch (imsg.hdr.type) {
2113 	case GOT_IMSG_GITCONFIG_STR_VAL:
2114 		if (datalen == 0)
2115 			break;
2116 		*str = strndup(imsg.data, datalen);
2117 		if (*str == NULL) {
2118 			err = got_error_from_errno("strndup");
2119 			break;
2120 		}
2121 		break;
2122 	default:
2123 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2124 		break;
2125 	}
2126 
2127 	imsg_free(&imsg);
2128 	return err;
2129 }
2130 
2131 const struct got_error *
2132 got_privsep_recv_gitconfig_pair(char **key, char **val, struct imsgbuf *ibuf)
2133 {
2134 	const struct got_error *err = NULL;
2135 	struct got_imsg_gitconfig_pair p;
2136 	struct imsg imsg;
2137 	size_t datalen;
2138 	uint8_t *data;
2139 
2140 	*key = *val = NULL;
2141 
2142 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2143 	if (err)
2144 		return err;
2145 
2146 	data = imsg.data;
2147 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2148 
2149 	if (imsg.hdr.type != GOT_IMSG_GITCONFIG_PAIR) {
2150 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2151 		goto done;
2152 	}
2153 
2154 	if (datalen < sizeof(p)) {
2155 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2156 		goto done;
2157 	}
2158 
2159 	memcpy(&p, data, sizeof(p));
2160 	data += sizeof(p);
2161 
2162 	if (datalen != sizeof(p) + p.klen + p.vlen) {
2163 		err = got_error(GOT_ERR_PRIVSEP_LEN);
2164 		goto done;
2165 	}
2166 
2167 	*key = strndup(data, p.klen);
2168 	if (*key == NULL) {
2169 		err = got_error_from_errno("strndup");
2170 		goto done;
2171 	}
2172 	data += p.klen;
2173 
2174 	*val = strndup(data, p.vlen);
2175 	if (*val == NULL) {
2176 		err = got_error_from_errno("strndup");
2177 		goto done;
2178 	}
2179 
2180 done:
2181 	imsg_free(&imsg);
2182 	return err;
2183 }
2184 
2185 const struct got_error *
2186 got_privsep_recv_gitconfig_int(int *val, struct imsgbuf *ibuf)
2187 {
2188 	const struct got_error *err = NULL;
2189 	struct imsg imsg;
2190 	size_t datalen;
2191 	const size_t min_datalen =
2192 	    MIN(sizeof(struct got_imsg_error), sizeof(int));
2193 
2194 	*val = 0;
2195 
2196 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2197 	if (err)
2198 		return err;
2199 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2200 
2201 	switch (imsg.hdr.type) {
2202 	case GOT_IMSG_GITCONFIG_INT_VAL:
2203 		if (datalen != sizeof(*val)) {
2204 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2205 			break;
2206 		}
2207 		memcpy(val, imsg.data, sizeof(*val));
2208 		break;
2209 	default:
2210 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2211 		break;
2212 	}
2213 
2214 	imsg_free(&imsg);
2215 	return err;
2216 }
2217 
2218 static void
2219 free_remote_data(struct got_remote_repo *remote)
2220 {
2221 	int i;
2222 
2223 	free(remote->name);
2224 	free(remote->fetch_url);
2225 	free(remote->send_url);
2226 	for (i = 0; i < remote->nfetch_branches; i++)
2227 		free(remote->fetch_branches[i]);
2228 	free(remote->fetch_branches);
2229 	for (i = 0; i < remote->nsend_branches; i++)
2230 		free(remote->send_branches[i]);
2231 	free(remote->send_branches);
2232 	for (i = 0; i < remote->nfetch_refs; i++)
2233 		free(remote->fetch_refs[i]);
2234 	free(remote->fetch_refs);
2235 }
2236 
2237 const struct got_error *
2238 got_privsep_recv_gitconfig_remotes(struct got_remote_repo **remotes,
2239     int *nremotes, struct imsgbuf *ibuf)
2240 {
2241 	const struct got_error *err = NULL;
2242 	struct imsg imsg;
2243 	size_t datalen;
2244 	struct got_imsg_remotes iremotes;
2245 	struct got_imsg_remote iremote;
2246 
2247 	*remotes = NULL;
2248 	*nremotes = 0;
2249 	iremotes.nremotes = 0;
2250 
2251 	err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremotes));
2252 	if (err)
2253 		return err;
2254 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2255 
2256 	switch (imsg.hdr.type) {
2257 	case GOT_IMSG_GITCONFIG_REMOTES:
2258 		if (datalen != sizeof(iremotes)) {
2259 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2260 			break;
2261 		}
2262 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2263 		if (iremotes.nremotes == 0) {
2264 			imsg_free(&imsg);
2265 			return NULL;
2266 		}
2267 		break;
2268 	default:
2269 		imsg_free(&imsg);
2270 		return got_error(GOT_ERR_PRIVSEP_MSG);
2271 	}
2272 
2273 	imsg_free(&imsg);
2274 
2275 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2276 	if (*remotes == NULL)
2277 		return got_error_from_errno("recallocarray");
2278 
2279 	while (*nremotes < iremotes.nremotes) {
2280 		struct got_remote_repo *remote;
2281 
2282 		err = got_privsep_recv_imsg(&imsg, ibuf, sizeof(iremote));
2283 		if (err)
2284 			break;
2285 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2286 
2287 		switch (imsg.hdr.type) {
2288 		case GOT_IMSG_GITCONFIG_REMOTE:
2289 			remote = &(*remotes)[*nremotes];
2290 			memset(remote, 0, sizeof(*remote));
2291 			if (datalen < sizeof(iremote)) {
2292 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2293 				break;
2294 			}
2295 			memcpy(&iremote, imsg.data, sizeof(iremote));
2296 			if (iremote.name_len == 0 ||
2297 			    iremote.fetch_url_len == 0 ||
2298 			    iremote.send_url_len == 0 ||
2299 			    (sizeof(iremote) + iremote.name_len +
2300 			    iremote.fetch_url_len + iremote.send_url_len) > datalen) {
2301 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2302 				break;
2303 			}
2304 			remote->name = strndup(imsg.data + sizeof(iremote),
2305 			    iremote.name_len);
2306 			if (remote->name == NULL) {
2307 				err = got_error_from_errno("strndup");
2308 				break;
2309 			}
2310 			remote->fetch_url = strndup(imsg.data + sizeof(iremote) +
2311 			    iremote.name_len, iremote.fetch_url_len);
2312 			if (remote->fetch_url == NULL) {
2313 				err = got_error_from_errno("strndup");
2314 				free_remote_data(remote);
2315 				break;
2316 			}
2317 			remote->send_url = strndup(imsg.data + sizeof(iremote) +
2318 			    iremote.name_len + iremote.fetch_url_len,
2319 			    iremote.send_url_len);
2320 			if (remote->send_url == NULL) {
2321 				err = got_error_from_errno("strndup");
2322 				free_remote_data(remote);
2323 				break;
2324 			}
2325 			remote->mirror_references = iremote.mirror_references;
2326 			remote->fetch_all_branches = iremote.fetch_all_branches;
2327 			remote->nfetch_branches = 0;
2328 			remote->fetch_branches = NULL;
2329 			remote->nsend_branches = 0;
2330 			remote->send_branches = NULL;
2331 			remote->nfetch_refs = 0;
2332 			remote->fetch_refs = NULL;
2333 			(*nremotes)++;
2334 			break;
2335 		default:
2336 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2337 			break;
2338 		}
2339 
2340 		imsg_free(&imsg);
2341 		if (err)
2342 			break;
2343 	}
2344 
2345 	if (err) {
2346 		int i;
2347 		for (i = 0; i < *nremotes; i++)
2348 			free_remote_data(&(*remotes)[i]);
2349 		free(*remotes);
2350 		*remotes = NULL;
2351 		*nremotes = 0;
2352 	}
2353 	return err;
2354 }
2355 
2356 const struct got_error *
2357 got_privsep_send_gotconfig_parse_req(struct imsgbuf *ibuf, int fd)
2358 {
2359 	const struct got_error *err = NULL;
2360 
2361 	if (imsg_compose(ibuf, GOT_IMSG_GOTCONFIG_PARSE_REQUEST, 0, 0, fd,
2362 	    NULL, 0) == -1) {
2363 		err = got_error_from_errno("imsg_compose "
2364 		    "GOTCONFIG_PARSE_REQUEST");
2365 		close(fd);
2366 		return err;
2367 	}
2368 
2369 	return flush_imsg(ibuf);
2370 }
2371 
2372 const struct got_error *
2373 got_privsep_send_gotconfig_author_req(struct imsgbuf *ibuf)
2374 {
2375 	if (imsg_compose(ibuf,
2376 	    GOT_IMSG_GOTCONFIG_AUTHOR_REQUEST, 0, 0, -1, NULL, 0) == -1)
2377 		return got_error_from_errno("imsg_compose "
2378 		    "GOTCONFIG_AUTHOR_REQUEST");
2379 
2380 	return flush_imsg(ibuf);
2381 }
2382 
2383 const struct got_error *
2384 got_privsep_send_gotconfig_allowed_signers_req(struct imsgbuf *ibuf)
2385 {
2386 	if (imsg_compose(ibuf,
2387 	    GOT_IMSG_GOTCONFIG_ALLOWEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2388 		return got_error_from_errno("imsg_compose "
2389 		    "GOTCONFIG_ALLOWEDSIGNERS_REQUEST");
2390 
2391 	return flush_imsg(ibuf);
2392 }
2393 
2394 const struct got_error *
2395 got_privsep_send_gotconfig_revoked_signers_req(struct imsgbuf *ibuf)
2396 {
2397 	if (imsg_compose(ibuf,
2398 	    GOT_IMSG_GOTCONFIG_REVOKEDSIGNERS_REQUEST, 0, 0, -1, NULL, 0) == -1)
2399 		return got_error_from_errno("imsg_compose "
2400 		    "GOTCONFIG_REVOKEDSIGNERS_REQUEST");
2401 
2402 	return flush_imsg(ibuf);
2403 }
2404 
2405 const struct got_error *
2406 got_privsep_send_gotconfig_signer_id_req(struct imsgbuf *ibuf)
2407 {
2408 	if (imsg_compose(ibuf,
2409 	    GOT_IMSG_GOTCONFIG_SIGNERID_REQUEST, 0, 0, -1, NULL, 0) == -1)
2410 		return got_error_from_errno("imsg_compose "
2411 		    "GOTCONFIG_SIGNERID_REQUEST");
2412 
2413 	return flush_imsg(ibuf);
2414 }
2415 
2416 const struct got_error *
2417 got_privsep_send_gotconfig_remotes_req(struct imsgbuf *ibuf)
2418 {
2419 	if (imsg_compose(ibuf,
2420 	    GOT_IMSG_GOTCONFIG_REMOTES_REQUEST, 0, 0, -1, NULL, 0) == -1)
2421 		return got_error_from_errno("imsg_compose "
2422 		    "GOTCONFIG_REMOTE_REQUEST");
2423 
2424 	return flush_imsg(ibuf);
2425 }
2426 
2427 const struct got_error *
2428 got_privsep_recv_gotconfig_str(char **str, struct imsgbuf *ibuf)
2429 {
2430 	const struct got_error *err = NULL;
2431 	struct imsg imsg;
2432 	size_t datalen;
2433 
2434 	*str = NULL;
2435 
2436 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2437 	if (err)
2438 		return err;
2439 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2440 
2441 	switch (imsg.hdr.type) {
2442 	case GOT_IMSG_GOTCONFIG_STR_VAL:
2443 		if (datalen == 0)
2444 			break;
2445 		*str = strndup(imsg.data, datalen);
2446 		if (*str == NULL) {
2447 			err = got_error_from_errno("strndup");
2448 			break;
2449 		}
2450 		break;
2451 	default:
2452 		err = got_error(GOT_ERR_PRIVSEP_MSG);
2453 		break;
2454 	}
2455 
2456 	imsg_free(&imsg);
2457 	return err;
2458 }
2459 
2460 const struct got_error *
2461 got_privsep_recv_gotconfig_remotes(struct got_remote_repo **remotes,
2462     int *nremotes, struct imsgbuf *ibuf)
2463 {
2464 	const struct got_error *err = NULL;
2465 	struct imsg imsg;
2466 	size_t datalen;
2467 	struct got_imsg_remotes iremotes;
2468 	struct got_imsg_remote iremote;
2469 	const size_t min_datalen =
2470 	    MIN(sizeof(struct got_imsg_error), sizeof(iremotes));
2471 
2472 	*remotes = NULL;
2473 	*nremotes = 0;
2474 	iremotes.nremotes = 0;
2475 
2476 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2477 	if (err)
2478 		return err;
2479 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2480 
2481 	switch (imsg.hdr.type) {
2482 	case GOT_IMSG_GOTCONFIG_REMOTES:
2483 		if (datalen != sizeof(iremotes)) {
2484 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2485 			break;
2486 		}
2487 		memcpy(&iremotes, imsg.data, sizeof(iremotes));
2488 		if (iremotes.nremotes < 0) {
2489 			err = got_error(GOT_ERR_PRIVSEP_LEN);
2490 			break;
2491 		}
2492 		if (iremotes.nremotes == 0) {
2493 			imsg_free(&imsg);
2494 			return NULL;
2495 		}
2496 		break;
2497 	default:
2498 		imsg_free(&imsg);
2499 		return got_error(GOT_ERR_PRIVSEP_MSG);
2500 	}
2501 
2502 	imsg_free(&imsg);
2503 
2504 	*remotes = recallocarray(NULL, 0, iremotes.nremotes, sizeof(**remotes));
2505 	if (*remotes == NULL)
2506 		return got_error_from_errno("recallocarray");
2507 
2508 	while (*nremotes < iremotes.nremotes) {
2509 		struct got_remote_repo *remote;
2510 		const size_t min_datalen =
2511 		    MIN(sizeof(struct got_imsg_error), sizeof(iremote));
2512 		int i;
2513 
2514 		err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
2515 		if (err)
2516 			break;
2517 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2518 
2519 		switch (imsg.hdr.type) {
2520 		case GOT_IMSG_GOTCONFIG_REMOTE:
2521 			remote = &(*remotes)[*nremotes];
2522 			memset(remote, 0, sizeof(*remote));
2523 			if (datalen < sizeof(iremote)) {
2524 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2525 				break;
2526 			}
2527 			memcpy(&iremote, imsg.data, sizeof(iremote));
2528 			if (iremote.name_len == 0 ||
2529 			    (iremote.fetch_url_len == 0 &&
2530 			    iremote.send_url_len == 0) ||
2531 			    (sizeof(iremote) + iremote.name_len +
2532 			    iremote.fetch_url_len + iremote.send_url_len) >
2533 			    datalen) {
2534 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2535 				break;
2536 			}
2537 			remote->name = strndup(imsg.data + sizeof(iremote),
2538 			    iremote.name_len);
2539 			if (remote->name == NULL) {
2540 				err = got_error_from_errno("strndup");
2541 				break;
2542 			}
2543 			remote->fetch_url = strndup(imsg.data +
2544 			    sizeof(iremote) + iremote.name_len,
2545 			    iremote.fetch_url_len);
2546 			if (remote->fetch_url == NULL) {
2547 				err = got_error_from_errno("strndup");
2548 				free_remote_data(remote);
2549 				break;
2550 			}
2551 			remote->send_url = strndup(imsg.data +
2552 			    sizeof(iremote) + iremote.name_len +
2553 			    iremote.fetch_url_len, iremote.send_url_len);
2554 			if (remote->send_url == NULL) {
2555 				err = got_error_from_errno("strndup");
2556 				free_remote_data(remote);
2557 				break;
2558 			}
2559 			remote->mirror_references = iremote.mirror_references;
2560 			remote->fetch_all_branches = iremote.fetch_all_branches;
2561 			if (iremote.nfetch_branches > 0) {
2562 				remote->fetch_branches = recallocarray(NULL, 0,
2563 				    iremote.nfetch_branches, sizeof(char *));
2564 				if (remote->fetch_branches == NULL) {
2565 					err = got_error_from_errno("calloc");
2566 					free_remote_data(remote);
2567 					break;
2568 				}
2569 			}
2570 			remote->nfetch_branches = 0;
2571 			for (i = 0; i < iremote.nfetch_branches; i++) {
2572 				char *branch;
2573 				err = got_privsep_recv_gotconfig_str(&branch,
2574 				    ibuf);
2575 				if (err) {
2576 					free_remote_data(remote);
2577 					goto done;
2578 				}
2579 				remote->fetch_branches[i] = branch;
2580 				remote->nfetch_branches++;
2581 			}
2582 			if (iremote.nsend_branches > 0) {
2583 				remote->send_branches = recallocarray(NULL, 0,
2584 				    iremote.nsend_branches, sizeof(char *));
2585 				if (remote->send_branches == NULL) {
2586 					err = got_error_from_errno("calloc");
2587 					free_remote_data(remote);
2588 					break;
2589 				}
2590 			}
2591 			remote->nsend_branches = 0;
2592 			for (i = 0; i < iremote.nsend_branches; i++) {
2593 				char *branch;
2594 				err = got_privsep_recv_gotconfig_str(&branch,
2595 				    ibuf);
2596 				if (err) {
2597 					free_remote_data(remote);
2598 					goto done;
2599 				}
2600 				remote->send_branches[i] = branch;
2601 				remote->nsend_branches++;
2602 			}
2603 			if (iremote.nfetch_refs > 0) {
2604 				remote->fetch_refs = recallocarray(NULL, 0,
2605 				    iremote.nfetch_refs, sizeof(char *));
2606 				if (remote->fetch_refs == NULL) {
2607 					err = got_error_from_errno("calloc");
2608 					free_remote_data(remote);
2609 					break;
2610 				}
2611 			}
2612 			remote->nfetch_refs = 0;
2613 			for (i = 0; i < iremote.nfetch_refs; i++) {
2614 				char *ref;
2615 				err = got_privsep_recv_gotconfig_str(&ref,
2616 				    ibuf);
2617 				if (err) {
2618 					free_remote_data(remote);
2619 					goto done;
2620 				}
2621 				remote->fetch_refs[i] = ref;
2622 				remote->nfetch_refs++;
2623 			}
2624 			(*nremotes)++;
2625 			break;
2626 		default:
2627 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2628 			break;
2629 		}
2630 
2631 		imsg_free(&imsg);
2632 		if (err)
2633 			break;
2634 	}
2635 done:
2636 	if (err) {
2637 		int i;
2638 		for (i = 0; i < *nremotes; i++)
2639 			free_remote_data(&(*remotes)[i]);
2640 		free(*remotes);
2641 		*remotes = NULL;
2642 		*nremotes = 0;
2643 	}
2644 	return err;
2645 }
2646 
2647 const struct got_error *
2648 got_privsep_send_commit_traversal_request(struct imsgbuf *ibuf,
2649     struct got_object_id *id, int idx, const char *path)
2650 {
2651 	struct ibuf *wbuf;
2652 	size_t path_len = strlen(path) + 1;
2653 
2654 	wbuf = imsg_create(ibuf, GOT_IMSG_COMMIT_TRAVERSAL_REQUEST, 0, 0,
2655 	    sizeof(struct got_imsg_commit_traversal_request) + path_len);
2656 	if (wbuf == NULL)
2657 		return got_error_from_errno(
2658 		    "imsg_create COMMIT_TRAVERSAL_REQUEST");
2659 	if (imsg_add(wbuf, id->sha1, SHA1_DIGEST_LENGTH) == -1)
2660 		return got_error_from_errno("imsg_add "
2661 		    "COMMIT_TRAVERSAL_REQUEST");
2662 	if (imsg_add(wbuf, &idx, sizeof(idx)) == -1)
2663 		return got_error_from_errno("imsg_add "
2664 		    "COMMIT_TRAVERSAL_REQUEST");
2665 	if (imsg_add(wbuf, path, path_len) == -1)
2666 		return got_error_from_errno("imsg_add "
2667 		    "COMMIT_TRAVERSAL_REQUEST");
2668 
2669 	wbuf->fd = -1;
2670 	imsg_close(ibuf, wbuf);
2671 
2672 	return flush_imsg(ibuf);
2673 }
2674 
2675 const struct got_error *
2676 got_privsep_recv_traversed_commits(struct got_commit_object **changed_commit,
2677     struct got_object_id **changed_commit_id,
2678     struct got_object_id_queue *commit_ids, struct imsgbuf *ibuf)
2679 {
2680 	const struct got_error *err = NULL;
2681 	struct imsg imsg;
2682 	struct got_imsg_traversed_commits *icommits;
2683 	struct got_object_id *ids;
2684 	size_t datalen;
2685 	int i, done = 0;
2686 
2687 	*changed_commit = NULL;
2688 	*changed_commit_id = NULL;
2689 
2690 	while (!done) {
2691 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2692 		if (err)
2693 			return err;
2694 
2695 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2696 		switch (imsg.hdr.type) {
2697 		case GOT_IMSG_TRAVERSED_COMMITS:
2698 			icommits = imsg.data;
2699 			if (datalen != sizeof(*icommits) +
2700 			    icommits->ncommits * sizeof(*ids)) {
2701 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2702 				break;
2703 			}
2704 			ids = imsg.data + sizeof(*icommits);
2705 			for (i = 0; i < icommits->ncommits; i++) {
2706 				struct got_object_qid *qid;
2707 
2708 				err = got_object_qid_alloc_partial(&qid);
2709 				if (err)
2710 					break;
2711 				memcpy(&qid->id, &ids[i], sizeof(ids[i]));
2712 				STAILQ_INSERT_TAIL(commit_ids, qid, entry);
2713 
2714 				/* The last commit may contain a change. */
2715 				if (i == icommits->ncommits - 1) {
2716 					*changed_commit_id =
2717 					    got_object_id_dup(&qid->id);
2718 					if (*changed_commit_id == NULL) {
2719 						err = got_error_from_errno(
2720 						    "got_object_id_dup");
2721 						break;
2722 					}
2723 				}
2724 			}
2725 			break;
2726 		case GOT_IMSG_COMMIT:
2727 			if (*changed_commit_id == NULL) {
2728 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2729 				break;
2730 			}
2731 			err = get_commit_from_imsg(changed_commit, &imsg,
2732 			    datalen, ibuf);
2733 			break;
2734 		case GOT_IMSG_COMMIT_TRAVERSAL_DONE:
2735 			done = 1;
2736 			break;
2737 		default:
2738 			err = got_error(GOT_ERR_PRIVSEP_MSG);
2739 			break;
2740 		}
2741 
2742 		imsg_free(&imsg);
2743 		if (err)
2744 			break;
2745 	}
2746 
2747 	if (err)
2748 		got_object_id_queue_free(commit_ids);
2749 	return err;
2750 }
2751 
2752 const struct got_error *
2753 got_privsep_send_enumerated_tree(size_t *totlen, struct imsgbuf *ibuf,
2754     struct got_object_id *tree_id, const char *path,
2755     struct got_parsed_tree_entry *entries, int nentries)
2756 {
2757 	const struct got_error *err = NULL;
2758 	struct ibuf *wbuf;
2759 	size_t path_len = strlen(path);
2760 	size_t msglen;
2761 
2762 	msglen = sizeof(struct got_imsg_enumerated_tree) + path_len;
2763 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_TREE, 0, 0, msglen);
2764 	if (wbuf == NULL)
2765 		return got_error_from_errno("imsg_create ENUMERATED_TREE");
2766 
2767 	if (imsg_add(wbuf, tree_id->sha1, SHA1_DIGEST_LENGTH) == -1)
2768 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2769 	if (imsg_add(wbuf, &nentries, sizeof(nentries)) == -1)
2770 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2771 	if (imsg_add(wbuf, path, path_len) == -1)
2772 		return got_error_from_errno("imsg_add ENUMERATED_TREE");
2773 
2774 	wbuf->fd = -1;
2775 	imsg_close(ibuf, wbuf);
2776 
2777 	if (entries) {
2778 		err = send_tree_entries(ibuf, entries, nentries);
2779 		if (err)
2780 			return err;
2781 	}
2782 
2783 	return flush_imsg(ibuf);
2784 }
2785 
2786 const struct got_error *
2787 got_privsep_send_object_enumeration_request(struct imsgbuf *ibuf)
2788 {
2789 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_REQUEST,
2790 	    0, 0, -1, NULL, 0) == -1)
2791 		return got_error_from_errno("imsg_compose "
2792 		    "OBJECT_ENUMERATION_REQUEST");
2793 
2794 	return flush_imsg(ibuf);
2795 }
2796 
2797 const struct got_error *
2798 got_privsep_send_object_enumeration_done(struct imsgbuf *ibuf)
2799 {
2800 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_DONE,
2801 	    0, 0, -1, NULL, 0) == -1)
2802 		return got_error_from_errno("imsg_compose "
2803 		    "OBJECT_ENUMERATION_DONE");
2804 
2805 	return flush_imsg(ibuf);
2806 }
2807 
2808 const struct got_error *
2809 got_privsep_send_object_enumeration_incomplete(struct imsgbuf *ibuf)
2810 {
2811 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE,
2812 	    0, 0, -1, NULL, 0) == -1)
2813 		return got_error_from_errno("imsg_compose "
2814 		    "OBJECT_ENUMERATION_INCOMPLETE");
2815 
2816 	return flush_imsg(ibuf);
2817 }
2818 
2819 const struct got_error *
2820 got_privsep_send_enumerated_commit(struct imsgbuf *ibuf,
2821     struct got_object_id *id, time_t mtime)
2822 {
2823 	struct ibuf *wbuf;
2824 
2825 	wbuf = imsg_create(ibuf, GOT_IMSG_ENUMERATED_COMMIT, 0, 0,
2826 	    sizeof(struct got_imsg_enumerated_commit) + SHA1_DIGEST_LENGTH);
2827 	if (wbuf == NULL)
2828 		return got_error_from_errno("imsg_create ENUMERATED_COMMIT");
2829 
2830 	/* Keep in sync with struct got_imsg_enumerated_commit! */
2831 	if (imsg_add(wbuf, id, SHA1_DIGEST_LENGTH) == -1)
2832 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2833 	if (imsg_add(wbuf, &mtime, sizeof(mtime)) == -1)
2834 		return got_error_from_errno("imsg_add ENUMERATED_COMMIT");
2835 
2836 	wbuf->fd = -1;
2837 	imsg_close(ibuf, wbuf);
2838 	/* Don't flush yet, tree entries or ENUMERATION_DONE will follow. */
2839 	return NULL;
2840 }
2841 
2842 const struct got_error *
2843 got_privsep_recv_enumerated_objects(int *found_all_objects,
2844     struct imsgbuf *ibuf,
2845     got_object_enumerate_commit_cb cb_commit,
2846     got_object_enumerate_tree_cb cb_tree, void *cb_arg,
2847     struct got_repository *repo)
2848 {
2849 	const struct got_error *err = NULL;
2850 	struct imsg imsg;
2851 	struct got_imsg_enumerated_commit *icommit = NULL;
2852 	struct got_object_id commit_id;
2853 	int have_commit = 0;
2854 	time_t mtime = 0;
2855 	struct got_tree_object tree;
2856 	struct got_imsg_enumerated_tree *itree;
2857 	struct got_object_id tree_id;
2858 	char *path = NULL, *canon_path = NULL;
2859 	size_t datalen, path_len;
2860 	int nentries = -1;
2861 	int done = 0;
2862 
2863 	*found_all_objects = 0;
2864 	memset(&tree, 0, sizeof(tree));
2865 
2866 	while (!done) {
2867 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
2868 		if (err)
2869 			break;
2870 
2871 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
2872 		switch (imsg.hdr.type) {
2873 		case GOT_IMSG_ENUMERATED_COMMIT:
2874 			if (have_commit && nentries != -1) {
2875 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2876 				break;
2877 			}
2878 			if (datalen != sizeof(*icommit)) {
2879 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2880 				break;
2881 			}
2882 			icommit = (struct got_imsg_enumerated_commit *)imsg.data;
2883 			memcpy(commit_id.sha1, icommit->id, SHA1_DIGEST_LENGTH);
2884 			mtime = icommit->mtime;
2885 			have_commit = 1;
2886 			break;
2887 		case GOT_IMSG_ENUMERATED_TREE:
2888 			/* Should be preceeded by GOT_IMSG_ENUMERATED_COMMIT. */
2889 			if (!have_commit) {
2890 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2891 				break;
2892 			}
2893 			if (datalen < sizeof(*itree)) {
2894 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2895 				break;
2896 			}
2897 			itree = imsg.data;
2898 			path_len = datalen - sizeof(*itree);
2899 			if (path_len == 0) {
2900 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2901 				break;
2902 			}
2903 			memcpy(tree_id.sha1, itree->id, sizeof(tree_id.sha1));
2904 			free(path);
2905 			path = strndup(imsg.data + sizeof(*itree), path_len);
2906 			if (path == NULL) {
2907 				err = got_error_from_errno("strndup");
2908 				break;
2909 			}
2910 			free(canon_path);
2911 			canon_path = malloc(path_len + 1);
2912 			if (canon_path == NULL) {
2913 				err = got_error_from_errno("malloc");
2914 				break;
2915 			}
2916 			if (!got_path_is_absolute(path)) {
2917 				err = got_error(GOT_ERR_BAD_PATH);
2918 				break;
2919 			}
2920 			if (got_path_is_root_dir(path)) {
2921 				/* XXX check what got_canonpath() does wrong */
2922 				canon_path[0] = '/';
2923 				canon_path[1] = '\0';
2924 			} else {
2925 				err = got_canonpath(path, canon_path,
2926 				    path_len + 1);
2927 				if (err)
2928 					break;
2929 			}
2930 			if (strcmp(path, canon_path) != 0) {
2931 				err = got_error(GOT_ERR_BAD_PATH);
2932 				break;
2933 			}
2934 			if (nentries != -1) {
2935 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2936 				break;
2937 			}
2938 			if (itree->nentries < -1) {
2939 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2940 				break;
2941 			}
2942 			if (itree->nentries == -1) {
2943 				/* Tree was not found in pack file. */
2944 				err = cb_tree(cb_arg, NULL, mtime, &tree_id,
2945 				    path, repo);
2946 				break;
2947 			}
2948 			if (itree->nentries > INT_MAX) {
2949 				err = got_error(GOT_ERR_PRIVSEP_LEN);
2950 				break;
2951 			}
2952 			tree.entries = calloc(itree->nentries,
2953 			    sizeof(struct got_tree_entry));
2954 			if (tree.entries == NULL) {
2955 				err = got_error_from_errno("calloc");
2956 				break;
2957 			}
2958 			if (itree->nentries == 0) {
2959 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2960 				    path, repo);
2961 				if (err)
2962 					break;
2963 
2964 				/* Prepare for next tree. */
2965 				free(tree.entries);
2966 				memset(&tree, 0, sizeof(tree));
2967 				nentries = -1;
2968 			} else {
2969 				tree.nentries = itree->nentries;
2970 				nentries = 0;
2971 			}
2972 			break;
2973 		case GOT_IMSG_TREE_ENTRIES:
2974 			/* Should be preceeded by GOT_IMSG_ENUMERATED_TREE. */
2975 			if (nentries <= -1) {
2976 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2977 				break;
2978 			}
2979 			err = recv_tree_entries(imsg.data, datalen,
2980 			    &tree, &nentries);
2981 			if (err)
2982 				break;
2983 			if (tree.nentries == nentries) {
2984 				err = cb_tree(cb_arg, &tree, mtime, &tree_id,
2985 				    path, repo);
2986 				if (err)
2987 					break;
2988 
2989 				/* Prepare for next tree. */
2990 				free(tree.entries);
2991 				memset(&tree, 0, sizeof(tree));
2992 				nentries = -1;
2993 			}
2994 			break;
2995 		case GOT_IMSG_TREE_ENUMERATION_DONE:
2996 			/* All trees have been found and traversed. */
2997 			if (!have_commit || path == NULL || nentries != -1) {
2998 				err = got_error(GOT_ERR_PRIVSEP_MSG);
2999 				break;
3000 			}
3001 			err = cb_commit(cb_arg, mtime, &commit_id, repo);
3002 			if (err)
3003 				break;
3004 			have_commit = 0;
3005 			break;
3006 		case GOT_IMSG_OBJECT_ENUMERATION_DONE:
3007 			*found_all_objects = 1;
3008 			done = 1;
3009 			break;
3010 		case GOT_IMSG_OBJECT_ENUMERATION_INCOMPLETE:
3011 			done = 1;
3012 			break;
3013 		default:
3014 			err = got_error(GOT_ERR_PRIVSEP_MSG);
3015 			break;
3016 		}
3017 
3018 		imsg_free(&imsg);
3019 		if (err)
3020 			break;
3021 	}
3022 
3023 	free(path);
3024 	free(canon_path);
3025 	free(tree.entries);
3026 	return err;
3027 }
3028 
3029 const struct got_error *
3030 got_privsep_send_raw_delta_req(struct imsgbuf *ibuf, int idx,
3031     struct got_object_id *id)
3032 {
3033 	struct got_imsg_raw_delta_request dreq;
3034 
3035 	memset(&dreq, 0, sizeof(dreq));
3036 	dreq.idx = idx;
3037 	memcpy(&dreq.id, id, sizeof(dreq.id));
3038 
3039 	if (imsg_compose(ibuf, GOT_IMSG_RAW_DELTA_REQUEST, 0, 0, -1,
3040 	    &dreq, sizeof(dreq)) == -1)
3041 		return got_error_from_errno("imsg_compose RAW_DELTA_REQUEST");
3042 
3043 	return flush_imsg(ibuf);
3044 }
3045 
3046 const struct got_error *
3047 got_privsep_send_raw_delta_outfd(struct imsgbuf *ibuf, int fd)
3048 {
3049 	return send_fd(ibuf, GOT_IMSG_RAW_DELTA_OUTFD, fd);
3050 }
3051 
3052 const struct got_error *
3053 got_privsep_send_raw_delta(struct imsgbuf *ibuf, uint64_t base_size,
3054     uint64_t result_size,  off_t delta_size, off_t delta_compressed_size,
3055     off_t delta_offset, off_t delta_out_offset, struct got_object_id *base_id)
3056 {
3057 	struct got_imsg_raw_delta idelta;
3058 	int ret;
3059 
3060 	memset(&idelta, 0, sizeof(idelta));
3061 	idelta.base_size = base_size;
3062 	idelta.result_size = result_size;
3063 	idelta.delta_size = delta_size;
3064 	idelta.delta_compressed_size = delta_compressed_size;
3065 	idelta.delta_offset = delta_offset;
3066 	idelta.delta_out_offset = delta_out_offset;
3067 	memcpy(&idelta.base_id, &base_id, sizeof(idelta.base_id));
3068 
3069 	ret = imsg_compose(ibuf, GOT_IMSG_RAW_DELTA, 0, 0, -1,
3070 	    &idelta, sizeof(idelta));
3071 	if (ret == -1)
3072 		return got_error_from_errno("imsg_compose RAW_DELTA");
3073 
3074 	return flush_imsg(ibuf);
3075 }
3076 
3077 const struct got_error *
3078 got_privsep_recv_raw_delta(uint64_t *base_size, uint64_t *result_size,
3079     off_t *delta_size, off_t *delta_compressed_size, off_t *delta_offset,
3080     off_t *delta_out_offset, struct got_object_id **base_id,
3081     struct imsgbuf *ibuf)
3082 {
3083 	const struct got_error *err = NULL;
3084 	struct imsg imsg;
3085 	struct got_imsg_raw_delta *delta;
3086 	size_t datalen;
3087 
3088 	*base_size = 0;
3089 	*result_size = 0;
3090 	*delta_size = 0;
3091 	*delta_compressed_size = 0;
3092 	*delta_offset = 0;
3093 	*delta_out_offset = 0;
3094 	*base_id = NULL;
3095 
3096 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3097 	if (err)
3098 		return err;
3099 
3100 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3101 
3102 	switch (imsg.hdr.type) {
3103 	case GOT_IMSG_RAW_DELTA:
3104 		if (datalen != sizeof(*delta)) {
3105 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3106 			break;
3107 		}
3108 		delta = imsg.data;
3109 		*base_size = delta->base_size;
3110 		*result_size = delta->result_size;
3111 		*delta_size = delta->delta_size;
3112 		*delta_compressed_size = delta->delta_compressed_size;
3113 		*delta_offset = delta->delta_offset;
3114 		*delta_out_offset = delta->delta_out_offset;
3115 		*base_id = calloc(1, sizeof(**base_id));
3116 		if (*base_id == NULL) {
3117 			err = got_error_from_errno("malloc");
3118 			break;
3119 		}
3120 		memcpy(*base_id, &delta->base_id, sizeof(**base_id));
3121 		break;
3122 	default:
3123 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3124 		break;
3125 	}
3126 
3127 	imsg_free(&imsg);
3128 
3129 	if (err) {
3130 		free(*base_id);
3131 		*base_id = NULL;
3132 	}
3133 	return err;
3134 }
3135 
3136 static const struct got_error *
3137 send_idlist(struct imsgbuf *ibuf, struct got_object_id **ids, size_t nids)
3138 {
3139 	const struct got_error *err = NULL;
3140 	struct got_imsg_object_idlist idlist;
3141 	struct ibuf *wbuf;
3142 	size_t i;
3143 
3144 	memset(&idlist, 0, sizeof(idlist));
3145 
3146 	if (nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS)
3147 		return got_error(GOT_ERR_NO_SPACE);
3148 
3149 	wbuf = imsg_create(ibuf, GOT_IMSG_OBJ_ID_LIST, 0, 0,
3150 	    sizeof(idlist) + nids * sizeof(**ids));
3151 	if (wbuf == NULL) {
3152 		err = got_error_from_errno("imsg_create OBJ_ID_LIST");
3153 		return err;
3154 	}
3155 
3156 	idlist.nids = nids;
3157 	if (imsg_add(wbuf, &idlist, sizeof(idlist)) == -1)
3158 		return got_error_from_errno("imsg_add OBJ_ID_LIST");
3159 
3160 	for (i = 0; i < nids; i++) {
3161 		struct got_object_id *id = ids[i];
3162 		if (imsg_add(wbuf, id, sizeof(*id)) == -1)
3163 			return got_error_from_errno("imsg_add OBJ_ID_LIST");
3164 	}
3165 
3166 	wbuf->fd = -1;
3167 	imsg_close(ibuf, wbuf);
3168 
3169 	return flush_imsg(ibuf);
3170 }
3171 
3172 const struct got_error *
3173 got_privsep_send_object_idlist(struct imsgbuf *ibuf,
3174     struct got_object_id **ids, size_t nids)
3175 {
3176 	const struct got_error *err = NULL;
3177 	struct got_object_id *idlist[GOT_IMSG_OBJ_ID_LIST_MAX_NIDS];
3178 	int i, queued = 0;
3179 
3180 	for (i = 0; i < nids; i++) {
3181 		idlist[i % nitems(idlist)] = ids[i];
3182 		queued++;
3183 		if (queued >= nitems(idlist)) {
3184 			err = send_idlist(ibuf, idlist, queued);
3185 			if (err)
3186 				return err;
3187 			queued = 0;
3188 		}
3189 	}
3190 
3191 	if (queued > 0) {
3192 		err = send_idlist(ibuf, idlist, queued);
3193 		if (err)
3194 			return err;
3195 	}
3196 
3197 	return NULL;
3198 }
3199 
3200 const struct got_error *
3201 got_privsep_send_object_idlist_done(struct imsgbuf *ibuf)
3202 {
3203 	if (imsg_compose(ibuf, GOT_IMSG_OBJ_ID_LIST_DONE, 0, 0, -1, NULL, 0)
3204 	    == -1)
3205 		return got_error_from_errno("imsg_compose OBJ_ID_LIST_DONE");
3206 
3207 	return flush_imsg(ibuf);
3208 }
3209 
3210 const struct got_error *
3211 got_privsep_recv_object_idlist(int *done, struct got_object_id **ids,
3212     size_t *nids, struct imsgbuf *ibuf)
3213 {
3214 	const struct got_error *err = NULL;
3215 	struct imsg imsg;
3216 	struct got_imsg_object_idlist *idlist;
3217 	size_t datalen;
3218 
3219 	*ids = NULL;
3220 	*done = 0;
3221 	*nids = 0;
3222 
3223 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3224 	if (err)
3225 		return err;
3226 
3227 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3228 	switch (imsg.hdr.type) {
3229 	case GOT_IMSG_OBJ_ID_LIST:
3230 		if (datalen < sizeof(*idlist)) {
3231 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3232 			break;
3233 		}
3234 		idlist = imsg.data;
3235 		if (idlist->nids > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3236 		    idlist->nids * sizeof(**ids) > datalen - sizeof(*idlist)) {
3237 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3238 			break;
3239 		}
3240 		*nids = idlist->nids;
3241 		*ids = calloc(*nids, sizeof(**ids));
3242 		if (*ids == NULL) {
3243 			err = got_error_from_errno("calloc");
3244 			break;
3245 		}
3246 		memcpy(*ids, (uint8_t *)imsg.data + sizeof(*idlist),
3247 		    *nids * sizeof(**ids));
3248 		break;
3249 	case GOT_IMSG_OBJ_ID_LIST_DONE:
3250 		*done = 1;
3251 		break;
3252 	default:
3253 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3254 		break;
3255 	}
3256 
3257 	imsg_free(&imsg);
3258 
3259 	return err;
3260 }
3261 
3262 const struct got_error *
3263 got_privsep_send_delta_reuse_req(struct imsgbuf *ibuf)
3264 {
3265 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_REQUEST, 0, 0, -1, NULL, 0)
3266 	    == -1)
3267 		return got_error_from_errno("imsg_compose DELTA_REUSE_REQUEST");
3268 
3269 	return flush_imsg(ibuf);
3270 }
3271 
3272 const struct got_error *
3273 got_privsep_send_reused_deltas(struct imsgbuf *ibuf,
3274     struct got_imsg_reused_delta *deltas, size_t ndeltas)
3275 {
3276 	const struct got_error *err = NULL;
3277 	struct ibuf *wbuf;
3278 	struct got_imsg_reused_deltas ideltas;
3279 	size_t i;
3280 
3281 	memset(&ideltas, 0, sizeof(ideltas));
3282 
3283 	if (ndeltas > GOT_IMSG_REUSED_DELTAS_MAX_NDELTAS)
3284 		return got_error(GOT_ERR_NO_SPACE);
3285 
3286 	wbuf = imsg_create(ibuf, GOT_IMSG_REUSED_DELTAS, 0, 0,
3287 	    sizeof(ideltas) + ndeltas * sizeof(*deltas));
3288 	if (wbuf == NULL) {
3289 		err = got_error_from_errno("imsg_create REUSED_DELTAS");
3290 		return err;
3291 	}
3292 
3293 	ideltas.ndeltas = ndeltas;
3294 	if (imsg_add(wbuf, &ideltas, sizeof(ideltas)) == -1)
3295 		return got_error_from_errno("imsg_add REUSED_DELTAS");
3296 
3297 	for (i = 0; i < ndeltas; i++) {
3298 		struct got_imsg_reused_delta *delta = &deltas[i];
3299 		if (imsg_add(wbuf, delta, sizeof(*delta)) == -1)
3300 			return got_error_from_errno("imsg_add REUSED_DELTAS");
3301 	}
3302 
3303 	wbuf->fd = -1;
3304 	imsg_close(ibuf, wbuf);
3305 
3306 	return flush_imsg(ibuf);
3307 }
3308 
3309 const struct got_error *
3310 got_privsep_send_reused_deltas_done(struct imsgbuf *ibuf)
3311 {
3312 	if (imsg_compose(ibuf, GOT_IMSG_DELTA_REUSE_DONE, 0, 0, -1, NULL, 0)
3313 	    == -1)
3314 		return got_error_from_errno("imsg_compose DELTA_REUSE_DONE");
3315 
3316 	return flush_imsg(ibuf);
3317 }
3318 
3319 const struct got_error *
3320 got_privsep_recv_reused_deltas(int *done, struct got_imsg_reused_delta *deltas,
3321     size_t *ndeltas, struct imsgbuf *ibuf)
3322 {
3323 	const struct got_error *err = NULL;
3324 	struct imsg imsg;
3325 	struct got_imsg_reused_deltas *ideltas;
3326 	size_t datalen;
3327 
3328 	*done = 0;
3329 	*ndeltas = 0;
3330 
3331 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3332 	if (err)
3333 		return err;
3334 
3335 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3336 	switch (imsg.hdr.type) {
3337 	case GOT_IMSG_REUSED_DELTAS:
3338 		if (datalen < sizeof(*ideltas)) {
3339 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3340 			break;
3341 		}
3342 		ideltas = imsg.data;
3343 		if (ideltas->ndeltas > GOT_IMSG_OBJ_ID_LIST_MAX_NIDS ||
3344 		    ideltas->ndeltas * sizeof(*deltas) >
3345 		    datalen - sizeof(*ideltas)) {
3346 			err = got_error(GOT_ERR_PRIVSEP_LEN);
3347 			break;
3348 		}
3349 		*ndeltas = ideltas->ndeltas;
3350 		memcpy(deltas, (uint8_t *)imsg.data + sizeof(*ideltas),
3351 		    *ndeltas * sizeof(*deltas));
3352 		break;
3353 	case GOT_IMSG_DELTA_REUSE_DONE:
3354 		*done = 1;
3355 		break;
3356 	default:
3357 		err = got_error(GOT_ERR_PRIVSEP_MSG);
3358 		break;
3359 	}
3360 
3361 	imsg_free(&imsg);
3362 
3363 	return err;
3364 }
3365 
3366 const struct got_error *
3367 got_privsep_init_commit_painting(struct imsgbuf *ibuf)
3368 {
3369 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_INIT,
3370 	    0, 0, -1, NULL, 0)
3371 	    == -1)
3372 		return got_error_from_errno("imsg_compose "
3373 		    "COMMIT_PAINTING_INIT");
3374 
3375 	return flush_imsg(ibuf);
3376 }
3377 
3378 const struct got_error *
3379 got_privsep_send_painting_request(struct imsgbuf *ibuf, int idx,
3380     struct got_object_id *id, intptr_t color)
3381 {
3382 	struct got_imsg_commit_painting_request ireq;
3383 
3384 	memset(&ireq, 0, sizeof(ireq));
3385 	memcpy(&ireq.id, id, sizeof(ireq.id));
3386 	ireq.idx = idx;
3387 	ireq.color = color;
3388 
3389 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_REQUEST, 0, 0, -1,
3390 	    &ireq, sizeof(ireq)) == -1)
3391 		return got_error_from_errno("imsg_compose "
3392 		    "COMMIT_PAINTING_REQUEST");
3393 
3394 	return flush_imsg(ibuf);
3395 }
3396 
3397 static const struct got_error *
3398 send_painted_commits(struct got_object_id_queue *ids, int *nids,
3399     size_t remain, int present_in_pack, struct imsgbuf *ibuf)
3400 {
3401 	const struct got_error *err = NULL;
3402 	struct ibuf *wbuf = NULL;
3403 	struct got_object_qid *qid;
3404 	size_t msglen;
3405 	int ncommits;
3406 	intptr_t color;
3407 
3408 	msglen = MIN(remain, MAX_IMSGSIZE - IMSG_HEADER_SIZE);
3409 	ncommits = (msglen - sizeof(struct got_imsg_painted_commits)) /
3410 	    sizeof(struct got_imsg_painted_commit);
3411 
3412 	wbuf = imsg_create(ibuf, GOT_IMSG_PAINTED_COMMITS, 0, 0, msglen);
3413 	if (wbuf == NULL) {
3414 		err = got_error_from_errno("imsg_create PAINTED_COMMITS");
3415 		return err;
3416 	}
3417 
3418 	/* Keep in sync with struct got_imsg_painted_commits! */
3419 	if (imsg_add(wbuf, &ncommits, sizeof(ncommits)) == -1)
3420 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3421 	if (imsg_add(wbuf, &present_in_pack, sizeof(present_in_pack)) == -1)
3422 		return got_error_from_errno("imsg_add PAINTED_COMMITS");
3423 
3424 	while (ncommits > 0) {
3425 		qid = STAILQ_FIRST(ids);
3426 		STAILQ_REMOVE_HEAD(ids, entry);
3427 		ncommits--;
3428 		(*nids)--;
3429 		color = (intptr_t)qid->data;
3430 
3431 		/* Keep in sync with struct got_imsg_painted_commit! */
3432 		if (imsg_add(wbuf, qid->id.sha1, SHA1_DIGEST_LENGTH) == -1)
3433 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3434 		if (imsg_add(wbuf, &color, sizeof(color)) == -1)
3435 			return got_error_from_errno("imsg_add PAINTED_COMMITS");
3436 
3437 		got_object_qid_free(qid);
3438 	}
3439 
3440 	wbuf->fd = -1;
3441 	imsg_close(ibuf, wbuf);
3442 
3443 	return flush_imsg(ibuf);
3444 }
3445 
3446 const struct got_error *
3447 got_privsep_send_painted_commits(struct imsgbuf *ibuf,
3448     struct got_object_id_queue *ids, int *nids,
3449     int present_in_pack, int flush)
3450 {
3451 	const struct got_error *err;
3452 	size_t remain;
3453 
3454 	if (*nids <= 0)
3455 		return NULL;
3456 
3457 	do {
3458 		remain = (sizeof(struct got_imsg_painted_commits)) +
3459 		    *nids * sizeof(struct got_imsg_painted_commit);
3460 		if (flush || remain >= MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
3461 			err = send_painted_commits(ids, nids, remain,
3462 			    present_in_pack, ibuf);
3463 			if (err)
3464 				return err;
3465 		}
3466 	} while (flush && *nids > 0);
3467 
3468 	return NULL;
3469 }
3470 
3471 const struct got_error *
3472 got_privsep_send_painting_commits_done(struct imsgbuf *ibuf)
3473 {
3474 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT_PAINTING_DONE,
3475 	    0, 0, -1, NULL, 0)
3476 	    == -1)
3477 		return got_error_from_errno("imsg_compose "
3478 		    "COMMIT_PAINTING_DONE");
3479 
3480 	return flush_imsg(ibuf);
3481 }
3482 
3483 const struct got_error *
3484 got_privsep_recv_painted_commits(struct got_object_id_queue *new_ids,
3485     got_privsep_recv_painted_commit_cb cb, void *cb_arg, struct imsgbuf *ibuf)
3486 {
3487 	const struct got_error *err = NULL;
3488 	struct imsg imsg;
3489 	struct got_imsg_painted_commits icommits;
3490 	struct got_imsg_painted_commit icommit;
3491 	size_t datalen;
3492 	int i;
3493 
3494 	for (;;) {
3495 		err = got_privsep_recv_imsg(&imsg, ibuf, 0);
3496 		if (err)
3497 			return err;
3498 
3499 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
3500 		if (imsg.hdr.type == GOT_IMSG_COMMIT_PAINTING_DONE)
3501 			break;
3502 		if (imsg.hdr.type != GOT_IMSG_PAINTED_COMMITS)
3503 			return got_error(GOT_ERR_PRIVSEP_MSG);
3504 
3505 		if (datalen < sizeof(icommits))
3506 			return got_error(GOT_ERR_PRIVSEP_LEN);
3507 		memcpy(&icommits, imsg.data, sizeof(icommits));
3508 		if (icommits.ncommits * sizeof(icommit) < icommits.ncommits ||
3509 		    datalen < sizeof(icommits) +
3510 		    icommits.ncommits * sizeof(icommit))
3511 			return got_error(GOT_ERR_PRIVSEP_LEN);
3512 
3513 		for (i = 0; i < icommits.ncommits; i++) {
3514 			memcpy(&icommit,
3515 			    (uint8_t *)imsg.data + sizeof(icommits) + i * sizeof(icommit),
3516 			    sizeof(icommit));
3517 
3518 			if (icommits.present_in_pack) {
3519 				struct got_object_id id;
3520 				memcpy(id.sha1, icommit.id, SHA1_DIGEST_LENGTH);
3521 				err = cb(cb_arg, &id, icommit.color);
3522 				if (err)
3523 					break;
3524 			} else {
3525 				struct got_object_qid *qid;
3526 				err = got_object_qid_alloc_partial(&qid);
3527 				if (err)
3528 					break;
3529 				memcpy(qid->id.sha1, icommit.id,
3530 				    SHA1_DIGEST_LENGTH);
3531 				qid->data = (void *)icommit.color;
3532 				STAILQ_INSERT_TAIL(new_ids, qid, entry);
3533 			}
3534 		}
3535 
3536 		imsg_free(&imsg);
3537 	}
3538 
3539 	return err;
3540 }
3541 
3542 const struct got_error *
3543 got_privsep_unveil_exec_helpers(void)
3544 {
3545 	const char *helpers[] = {
3546 	    GOT_PATH_PROG_READ_PACK,
3547 	    GOT_PATH_PROG_READ_OBJECT,
3548 	    GOT_PATH_PROG_READ_COMMIT,
3549 	    GOT_PATH_PROG_READ_TREE,
3550 	    GOT_PATH_PROG_READ_BLOB,
3551 	    GOT_PATH_PROG_READ_TAG,
3552 	    GOT_PATH_PROG_READ_GITCONFIG,
3553 	    GOT_PATH_PROG_READ_GOTCONFIG,
3554 	    GOT_PATH_PROG_READ_PATCH,
3555 	    GOT_PATH_PROG_FETCH_PACK,
3556 	    GOT_PATH_PROG_INDEX_PACK,
3557 	    GOT_PATH_PROG_SEND_PACK,
3558 	};
3559 	size_t i;
3560 
3561 	for (i = 0; i < nitems(helpers); i++) {
3562 		if (unveil(helpers[i], "x") == 0)
3563 			continue;
3564 		return got_error_from_errno2("unveil", helpers[i]);
3565 	}
3566 
3567 	return NULL;
3568 }
3569 
3570 void
3571 got_privsep_exec_child(int imsg_fds[2], const char *path, const char *repo_path)
3572 {
3573 	if (close(imsg_fds[0]) == -1) {
3574 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3575 		_exit(1);
3576 	}
3577 
3578 	if (dup2(imsg_fds[1], GOT_IMSG_FD_CHILD) == -1) {
3579 		fprintf(stderr, "%s: %s\n", getprogname(), strerror(errno));
3580 		_exit(1);
3581 	}
3582 
3583 	closefrom(GOT_IMSG_FD_CHILD + 1);
3584 
3585 	if (execl(path, path, repo_path, (char *)NULL) == -1) {
3586 		fprintf(stderr, "%s: %s: %s\n", getprogname(), path,
3587 		    strerror(errno));
3588 		_exit(1);
3589 	}
3590 }