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Date:: Sun Nov 11 14:10:33 2018 UTC
Message:: wrap overlong line
Actions:: History | Blame | Raw File
1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 #include <sys/syslimits.h>
21 #include <sys/wait.h>
22 
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <errno.h>
27 #include <stdint.h>
28 #include <poll.h>
29 #include <imsg.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <time.h>
33 
34 #include "got_object.h"
35 #include "got_error.h"
36 
37 #include "got_lib_sha1.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_inflate.h"
40 #include "got_lib_object.h"
41 #include "got_lib_object_parse.h"
42 #include "got_lib_privsep.h"
43 #include "got_lib_pack.h"
44 
45 #ifndef MIN
46 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
47 #endif
48 
49 static const struct got_error *
50 poll_fd(int fd, int events, int timeout)
51 {
52 	struct pollfd pfd[1];
53 	int n;
54 
55 	pfd[0].fd = fd;
56 	pfd[0].events = events;
57 
58 	n = poll(pfd, 1, timeout);
59 	if (n == -1)
60 		return got_error_from_errno();
61 	if (n == 0)
62 		return got_error(GOT_ERR_TIMEOUT);
63 	if (pfd[0].revents & (POLLERR | POLLNVAL))
64 		return got_error_from_errno();
65 	if (pfd[0].revents & (events | POLLHUP))
66 		return NULL;
67 
68 	return got_error(GOT_ERR_INTERRUPT);
69 }
70 
71 static const struct got_error *
72 read_imsg(struct imsgbuf *ibuf)
73 {
74 	const struct got_error *err;
75 	size_t n;
76 
77 	err = poll_fd(ibuf->fd, POLLIN, INFTIM);
78 	if (err)
79 		return err;
80 
81 	n = imsg_read(ibuf);
82 	if (n == -1) {
83 		if (errno == EAGAIN) /* Could be a file-descriptor leak. */
84 			return got_error(GOT_ERR_PRIVSEP_NO_FD);
85 		return got_error(GOT_ERR_PRIVSEP_READ);
86 	}
87 	if (n == 0)
88 		return got_error(GOT_ERR_PRIVSEP_PIPE);
89 
90 	return NULL;
91 }
92 
93 const struct got_error *
94 got_privsep_wait_for_child(pid_t pid)
95 {
96 	int child_status;
97 
98 	waitpid(pid, &child_status, 0);
99 
100 	if (!WIFEXITED(child_status))
101 		return got_error(GOT_ERR_PRIVSEP_DIED);
102 
103 	if (WEXITSTATUS(child_status) != 0)
104 		return got_error(GOT_ERR_PRIVSEP_EXIT);
105 
106 	return NULL;
107 }
108 
109 const struct got_error *
110 got_privsep_recv_imsg(struct imsg *imsg, struct imsgbuf *ibuf,
111     size_t min_datalen)
112 {
113 	const struct got_error *err;
114 	ssize_t n;
115 
116 	n = imsg_get(ibuf, imsg);
117 	if (n == -1)
118 		return got_error_from_errno();
119 
120 	while (n == 0) {
121 		err = read_imsg(ibuf);
122 		if (err)
123 			return err;
124 		n = imsg_get(ibuf, imsg);
125 	}
126 
127 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
128 		return got_error(GOT_ERR_PRIVSEP_LEN);
129 
130 	return NULL;
131 }
132 
133 static const struct got_error *
134 recv_imsg_error(struct imsg *imsg, size_t datalen)
135 {
136 	struct got_imsg_error *ierr;
137 
138 	if (datalen != sizeof(*ierr))
139 		return got_error(GOT_ERR_PRIVSEP_LEN);
140 
141 	ierr = imsg->data;
142 	if (ierr->code == GOT_ERR_ERRNO) {
143 		static struct got_error serr;
144 		serr.code = GOT_ERR_ERRNO;
145 		serr.msg = strerror(ierr->errno_code);
146 		return &serr;
147 	}
148 
149 	return got_error(ierr->code);
150 }
151 
152 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
153 void
154 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
155 {
156 	const struct got_error *poll_err;
157 	struct got_imsg_error ierr;
158 	int ret;
159 
160 	ierr.code = err->code;
161 	if (err->code == GOT_ERR_ERRNO)
162 		ierr.errno_code = errno;
163 	else
164 		ierr.errno_code = 0;
165 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
166 	if (ret == -1) {
167 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
168 		    getprogname(), err->code, err->msg, strerror(errno));
169 		return;
170 	}
171 
172 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
173 	if (poll_err) {
174 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
175 		    getprogname(), err->code, err->msg, poll_err->msg);
176 		return;
177 	}
178 
179 	ret = imsg_flush(ibuf);
180 	if (ret == -1) {
181 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
182 		    getprogname(), err->code, err->msg, strerror(errno));
183 		return;
184 	}
185 }
186 
187 static const struct got_error *
188 flush_imsg(struct imsgbuf *ibuf)
189 {
190 	const struct got_error *err;
191 
192 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
193 	if (err)
194 		return err;
195 
196 	if (imsg_flush(ibuf) == -1)
197 		return got_error_from_errno();
198 
199 	return NULL;
200 }
201 
202 const struct got_error *
203 got_privsep_send_stop(int fd)
204 {
205 	const struct got_error *err = NULL;
206 	struct imsgbuf ibuf;
207 
208 	imsg_init(&ibuf, fd);
209 
210 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
211 		return got_error_from_errno();
212 
213 	err = flush_imsg(&ibuf);
214 	imsg_clear(&ibuf);
215 	return err;
216 }
217 
218 const struct got_error *
219 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd, struct got_object *obj)
220 {
221 	struct got_imsg_object iobj, *iobjp = NULL;
222 	size_t iobj_size = 0;
223 	int imsg_code = GOT_IMSG_OBJECT_REQUEST;
224 
225 	if (obj) {
226 		switch (obj->type) {
227 		case GOT_OBJ_TYPE_TREE:
228 			imsg_code = GOT_IMSG_TREE_REQUEST;
229 			break;
230 		case GOT_OBJ_TYPE_COMMIT:
231 			imsg_code = GOT_IMSG_COMMIT_REQUEST;
232 			break;
233 		case GOT_OBJ_TYPE_BLOB:
234 			imsg_code = GOT_IMSG_BLOB_REQUEST;
235 			break;
236 		default:
237 			return got_error(GOT_ERR_OBJ_TYPE);
238 		}
239 
240 		memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
241 		iobj.type = obj->type;
242 		iobj.flags = obj->flags;
243 		iobj.hdrlen = obj->hdrlen;
244 		iobj.size = obj->size;
245 		if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
246 			iobj.pack_offset = obj->pack_offset;
247 			iobj.pack_idx = obj->pack_idx;
248 		}
249 
250 		iobjp = &iobj;
251 		iobj_size = sizeof(iobj);
252 	}
253 
254 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, iobjp, iobj_size) == -1)
255 		return got_error_from_errno();
256 
257 	return flush_imsg(ibuf);
258 }
259 
260 const struct got_error *
261 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd)
262 {
263 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, NULL, 0)
264 	    == -1)
265 		return got_error_from_errno();
266 
267 	return flush_imsg(ibuf);
268 }
269 
270 const struct got_error *
271 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
272 {
273 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
274 	    == -1)
275 		return got_error_from_errno();
276 
277 	return flush_imsg(ibuf);
278 }
279 
280 const struct got_error *
281 got_privsep_send_tmpfd(struct imsgbuf *ibuf, int fd)
282 {
283 	if (imsg_compose(ibuf, GOT_IMSG_TMPFD, 0, 0, fd, NULL, 0)
284 	    == -1)
285 		return got_error_from_errno();
286 
287 	return flush_imsg(ibuf);
288 }
289 
290 const struct got_error *
291 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
292 {
293 	struct got_imsg_object iobj;
294 
295 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
296 	iobj.type = obj->type;
297 	iobj.flags = obj->flags;
298 	iobj.hdrlen = obj->hdrlen;
299 	iobj.size = obj->size;
300 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
301 		iobj.pack_offset = obj->pack_offset;
302 		iobj.pack_idx = obj->pack_idx;
303 	}
304 
305 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
306 	    == -1)
307 		return got_error_from_errno();
308 
309 	return flush_imsg(ibuf);
310 }
311 
312 const struct got_error *
313 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
314     struct imsgbuf *ibuf)
315 {
316 	const struct got_error *err = NULL;
317 	struct got_imsg_object *iobj;
318 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
319 
320 	if (datalen != sizeof(*iobj))
321 		return got_error(GOT_ERR_PRIVSEP_LEN);
322 	iobj = imsg->data;
323 
324 	*obj = calloc(1, sizeof(**obj));
325 	if (*obj == NULL)
326 		return got_error_from_errno();
327 
328 	memcpy((*obj)->id.sha1, iobj->id, SHA1_DIGEST_LENGTH);
329 	(*obj)->type = iobj->type;
330 	(*obj)->flags = iobj->flags;
331 	(*obj)->hdrlen = iobj->hdrlen;
332 	(*obj)->size = iobj->size;
333 	/* path_packfile is handled by caller */
334 	if (iobj->flags & GOT_OBJ_FLAG_PACKED) {
335 		(*obj)->pack_offset = iobj->pack_offset;
336 		(*obj)->pack_idx = iobj->pack_idx;
337 	}
338 
339 	return err;
340 }
341 
342 const struct got_error *
343 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
344 {
345 	const struct got_error *err = NULL;
346 	struct imsg imsg;
347 	size_t datalen;
348 	const size_t min_datalen =
349 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
350 
351 	*obj = NULL;
352 
353 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
354 	if (err)
355 		return err;
356 
357 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
358 
359 	switch (imsg.hdr.type) {
360 	case GOT_IMSG_ERROR:
361 		err = recv_imsg_error(&imsg, datalen);
362 		break;
363 	case GOT_IMSG_OBJECT:
364 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
365 		break;
366 	default:
367 		err = got_error(GOT_ERR_PRIVSEP_MSG);
368 		break;
369 	}
370 
371 	imsg_free(&imsg);
372 
373 	return err;
374 }
375 
376 static const struct got_error *
377 send_commit_logmsg(struct imsgbuf *ibuf, struct got_commit_object *commit,
378     size_t logmsg_len)
379 {
380 	const struct got_error *err = NULL;
381 	size_t offset, remain;
382 
383 	offset = 0;
384 	remain = logmsg_len;
385 	while (remain > 0) {
386 		size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE, remain);
387 
388 		if (imsg_compose(ibuf, GOT_IMSG_COMMIT_LOGMSG, 0, 0, -1,
389 		    commit->logmsg + offset, n) == -1) {
390 			err = got_error_from_errno();
391 			break;
392 		}
393 
394 		err = flush_imsg(ibuf);
395 		if (err)
396 			break;
397 
398 		offset += n;
399 		remain -= n;
400 	}
401 
402 	return err;
403 }
404 
405 const struct got_error *
406 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
407 {
408 	const struct got_error *err = NULL;
409 	struct got_imsg_commit_object *icommit;
410 	uint8_t *buf;
411 	size_t len, total;
412 	struct got_object_qid *qid;
413 	size_t author_len = strlen(commit->author);
414 	size_t committer_len = strlen(commit->committer);
415 	size_t logmsg_len = strlen(commit->logmsg);
416 
417 	total = sizeof(*icommit) + author_len + committer_len +
418 	    commit->nparents * SHA1_DIGEST_LENGTH;
419 
420 	buf = malloc(total);
421 	if (buf == NULL)
422 		return got_error_from_errno();
423 
424 	icommit = (struct got_imsg_commit_object *)buf;
425 	memcpy(icommit->tree_id, commit->tree_id->sha1, sizeof(icommit->tree_id));
426 	icommit->author_len = author_len;
427 	icommit->author_time = commit->author_time;
428 	icommit->author_gmtoff = commit->author_gmtoff;
429 	icommit->committer_len = committer_len;
430 	icommit->committer_time = commit->committer_time;
431 	icommit->committer_gmtoff = commit->committer_gmtoff;
432 	icommit->logmsg_len = logmsg_len;
433 	icommit->nparents = commit->nparents;
434 
435 	len = sizeof(*icommit);
436 	memcpy(buf + len, commit->author, author_len);
437 	len += author_len;
438 	memcpy(buf + len, commit->committer, committer_len);
439 	len += committer_len;
440 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
441 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
442 		len += SHA1_DIGEST_LENGTH;
443 	}
444 
445 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
446 		err = got_error_from_errno();
447 		goto done;
448 	}
449 
450 	if (logmsg_len == 0 ||
451 	    logmsg_len + len > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
452 		err = flush_imsg(ibuf);
453 		if (err)
454 			goto done;
455 	}
456 	err = send_commit_logmsg(ibuf, commit, logmsg_len);
457 done:
458 	free(buf);
459 	return err;
460 }
461 
462 const struct got_error *
463 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
464 {
465 	const struct got_error *err = NULL;
466 	struct imsg imsg;
467 	struct got_imsg_commit_object *icommit;
468 	size_t len, datalen;
469 	int i;
470 	const size_t min_datalen =
471 	    MIN(sizeof(struct got_imsg_error),
472 	    sizeof(struct got_imsg_commit_object));
473 
474 	*commit = NULL;
475 
476 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
477 	if (err)
478 		return err;
479 
480 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
481 	len = 0;
482 
483 	switch (imsg.hdr.type) {
484 	case GOT_IMSG_ERROR:
485 		err = recv_imsg_error(&imsg, datalen);
486 		break;
487 	case GOT_IMSG_COMMIT:
488 		if (datalen < sizeof(*icommit)) {
489 			err = got_error(GOT_ERR_PRIVSEP_LEN);
490 			break;
491 		}
492 		icommit = imsg.data;
493 		if (datalen != sizeof(*icommit) + icommit->author_len +
494 		    icommit->committer_len +
495 		    icommit->nparents * SHA1_DIGEST_LENGTH) {
496 			err = got_error(GOT_ERR_PRIVSEP_LEN);
497 			break;
498 		}
499 		if (icommit->nparents < 0) {
500 			err = got_error(GOT_ERR_PRIVSEP_LEN);
501 			break;
502 		}
503 		len += sizeof(*icommit);
504 
505 		*commit = got_object_commit_alloc_partial();
506 		if (*commit == NULL) {
507 			err = got_error_from_errno();
508 			break;
509 		}
510 
511 		memcpy((*commit)->tree_id->sha1, icommit->tree_id,
512 		    SHA1_DIGEST_LENGTH);
513 		(*commit)->author_time = icommit->author_time;
514 		(*commit)->author_gmtoff = icommit->author_gmtoff;
515 		(*commit)->committer_time = icommit->committer_time;
516 		(*commit)->committer_gmtoff = icommit->committer_gmtoff;
517 
518 		if (icommit->author_len == 0) {
519 			(*commit)->author = strdup("");
520 			if ((*commit)->author == NULL) {
521 				err = got_error_from_errno();
522 				break;
523 			}
524 		} else {
525 			(*commit)->author = malloc(icommit->author_len + 1);
526 			if ((*commit)->author == NULL) {
527 				err = got_error_from_errno();
528 				break;
529 			}
530 			memcpy((*commit)->author, imsg.data + len,
531 			    icommit->author_len);
532 			(*commit)->author[icommit->author_len] = '\0';
533 		}
534 		len += icommit->author_len;
535 
536 		if (icommit->committer_len == 0) {
537 			(*commit)->committer = strdup("");
538 			if ((*commit)->committer == NULL) {
539 				err = got_error_from_errno();
540 				break;
541 			}
542 		} else {
543 			(*commit)->committer =
544 			    malloc(icommit->committer_len + 1);
545 			if ((*commit)->committer == NULL) {
546 				err = got_error_from_errno();
547 				break;
548 			}
549 			memcpy((*commit)->committer, imsg.data + len,
550 			    icommit->committer_len);
551 			(*commit)->committer[icommit->committer_len] = '\0';
552 		}
553 		len += icommit->committer_len;
554 
555 		if (icommit->logmsg_len == 0) {
556 			(*commit)->logmsg = strdup("");
557 			if ((*commit)->logmsg == NULL) {
558 				err = got_error_from_errno();
559 				break;
560 			}
561 		} else {
562 			size_t offset = 0, remain = icommit->logmsg_len;
563 
564 			(*commit)->logmsg = malloc(icommit->logmsg_len + 1);
565 			if ((*commit)->logmsg == NULL) {
566 				err = got_error_from_errno();
567 				break;
568 			}
569 			while (remain > 0) {
570 				struct imsg imsg_log;
571 				size_t n = MIN(MAX_IMSGSIZE - IMSG_HEADER_SIZE,
572 				    remain);
573 
574 				err = got_privsep_recv_imsg(&imsg_log, ibuf, n);
575 				if (err)
576 					return err;
577 
578 				if (imsg_log.hdr.type != GOT_IMSG_COMMIT_LOGMSG)
579 					return got_error(GOT_ERR_PRIVSEP_MSG);
580 
581 				memcpy((*commit)->logmsg + offset,
582 				    imsg_log.data, n);
583 				imsg_free(&imsg_log);
584 				offset += n;
585 				remain -= n;
586 			}
587 			(*commit)->logmsg[icommit->logmsg_len] = '\0';
588 		}
589 
590 		for (i = 0; i < icommit->nparents; i++) {
591 			struct got_object_qid *qid;
592 
593 			err = got_object_qid_alloc_partial(&qid);
594 			if (err)
595 				break;
596 			memcpy(qid->id, imsg.data + len +
597 			    i * SHA1_DIGEST_LENGTH, sizeof(*qid->id));
598 			SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
599 			(*commit)->nparents++;
600 		}
601 		break;
602 	default:
603 		err = got_error(GOT_ERR_PRIVSEP_MSG);
604 		break;
605 	}
606 
607 	imsg_free(&imsg);
608 
609 	return err;
610 }
611 
612 const struct got_error *
613 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_tree_object *tree)
614 {
615 	const struct got_error *err = NULL;
616 	struct got_imsg_tree_object itree;
617 	struct got_tree_entry *te;
618 	size_t totlen;
619 	int nimsg; /* number of imsg queued in ibuf */
620 
621 	itree.nentries = tree->entries.nentries;
622 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
623 	    == -1)
624 		return got_error_from_errno();
625 
626 	totlen = sizeof(itree);
627 	nimsg = 1;
628 	SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
629 		struct got_imsg_tree_entry *ite;
630 		uint8_t *buf = NULL;
631 		size_t len = sizeof(*ite) + strlen(te->name);
632 
633 		if (len > MAX_IMSGSIZE)
634 			return got_error(GOT_ERR_NO_SPACE);
635 
636 		nimsg++;
637 		if (totlen + len >= MAX_IMSGSIZE - (IMSG_HEADER_SIZE * nimsg)) {
638 			err = flush_imsg(ibuf);
639 			if (err)
640 				return err;
641 			nimsg = 0;
642 		}
643 
644 		buf = malloc(len);
645 		if (buf == NULL)
646 			return got_error_from_errno();
647 
648 		ite = (struct got_imsg_tree_entry *)buf;
649 		memcpy(ite->id, te->id->sha1, sizeof(ite->id));
650 		ite->mode = te->mode;
651 		memcpy(buf + sizeof(*ite), te->name, strlen(te->name));
652 
653 		if (imsg_compose(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, -1,
654 		    buf, len) == -1)
655 			err = got_error_from_errno();
656 		free(buf);
657 		if (err)
658 			return err;
659 		totlen += len;
660 	}
661 
662 	return flush_imsg(ibuf);
663 }
664 
665 const struct got_error *
666 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
667 {
668 	const struct got_error *err = NULL;
669 	const size_t min_datalen =
670 	    MIN(sizeof(struct got_imsg_error),
671 	    sizeof(struct got_imsg_tree_object));
672 	struct got_imsg_tree_object *itree;
673 	int nentries = 0;
674 
675 	*tree = NULL;
676 get_more:
677 	err = read_imsg(ibuf);
678 	if (err)
679 		goto done;
680 
681 	while (1) {
682 		struct imsg imsg;
683 		size_t n;
684 		size_t datalen;
685 		struct got_imsg_tree_entry *ite;
686 		struct got_tree_entry *te = NULL;
687 
688 		n = imsg_get(ibuf, &imsg);
689 		if (n == 0) {
690 			if (*tree && (*tree)->entries.nentries != nentries)
691 				goto get_more;
692 			break;
693 		}
694 
695 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
696 			return got_error(GOT_ERR_PRIVSEP_LEN);
697 
698 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
699 
700 		switch (imsg.hdr.type) {
701 		case GOT_IMSG_ERROR:
702 			err = recv_imsg_error(&imsg, datalen);
703 			break;
704 		case GOT_IMSG_TREE:
705 			/* This message should only appear once. */
706 			if (*tree != NULL) {
707 				err = got_error(GOT_ERR_PRIVSEP_MSG);
708 				break;
709 			}
710 			if (datalen != sizeof(*itree)) {
711 				err = got_error(GOT_ERR_PRIVSEP_LEN);
712 				break;
713 			}
714 			itree = imsg.data;
715 			*tree = malloc(sizeof(**tree));
716 			if (*tree == NULL) {
717 				err = got_error_from_errno();
718 				break;
719 			}
720 			(*tree)->entries.nentries = itree->nentries;
721 			SIMPLEQ_INIT(&(*tree)->entries.head);
722 			(*tree)->refcnt = 0;
723 			break;
724 		case GOT_IMSG_TREE_ENTRY:
725 			/* This message should be preceeded by GOT_IMSG_TREE. */
726 			if (*tree == NULL) {
727 				err = got_error(GOT_ERR_PRIVSEP_MSG);
728 				break;
729 			}
730 			if (datalen < sizeof(*ite) || datalen > MAX_IMSGSIZE) {
731 				err = got_error(GOT_ERR_PRIVSEP_LEN);
732 				break;
733 			}
734 
735 			/* Remaining data contains the entry's name. */
736 			datalen -= sizeof(*ite);
737 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
738 				err = got_error(GOT_ERR_PRIVSEP_LEN);
739 				break;
740 			}
741 			ite = imsg.data;
742 
743 			te = got_alloc_tree_entry_partial();
744 			if (te == NULL) {
745 				err = got_error_from_errno();
746 				break;
747 			}
748 			te->name = malloc(datalen + 1);
749 			if (te->name == NULL) {
750 				free(te);
751 				err = got_error_from_errno();
752 				break;
753 			}
754 			memcpy(te->name, imsg.data + sizeof(*ite), datalen);
755 			te->name[datalen] = '\0';
756 
757 			memcpy(te->id->sha1, ite->id, SHA1_DIGEST_LENGTH);
758 			te->mode = ite->mode;
759 			SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
760 			nentries++;
761 			break;
762 		default:
763 			err = got_error(GOT_ERR_PRIVSEP_MSG);
764 			break;
765 		}
766 
767 		imsg_free(&imsg);
768 	}
769 done:
770 	if (*tree && (*tree)->entries.nentries != nentries) {
771 		if (err == NULL)
772 			err = got_error(GOT_ERR_PRIVSEP_LEN);
773 		got_object_tree_close(*tree);
774 		*tree = NULL;
775 	}
776 
777 	return err;
778 }
779 
780 const struct got_error *
781 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size)
782 {
783 	struct got_imsg_blob iblob;
784 
785 	iblob.size = size;
786 	/* Data has already been written to file descriptor. */
787 
788 	if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob, sizeof(iblob))
789 	    == -1)
790 		return got_error_from_errno();
791 
792 	return flush_imsg(ibuf);
793 }
794 
795 const struct got_error *
796 got_privsep_recv_blob(size_t *size, struct imsgbuf *ibuf)
797 {
798 	const struct got_error *err = NULL;
799 	struct imsg imsg;
800 	struct got_imsg_blob *iblob;
801 	size_t datalen;
802 
803 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
804 	if (err)
805 		return err;
806 
807 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
808 
809 	switch (imsg.hdr.type) {
810 	case GOT_IMSG_ERROR:
811 		err = recv_imsg_error(&imsg, datalen);
812 		break;
813 	case GOT_IMSG_BLOB:
814 		if (datalen != sizeof(*iblob)) {
815 			err = got_error(GOT_ERR_PRIVSEP_LEN);
816 			break;
817 		}
818 		iblob = imsg.data;
819 		*size = iblob->size;
820 		/* Data has been written to file descriptor. */
821 		break;
822 	default:
823 		err = got_error(GOT_ERR_PRIVSEP_MSG);
824 		break;
825 	}
826 
827 	imsg_free(&imsg);
828 
829 	return err;
830 }
831 
832 const struct got_error *
833 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
834     struct got_packidx *packidx)
835 {
836 	struct got_imsg_packidx ipackidx;
837 	struct got_imsg_pack ipack;
838 	int fd;
839 
840 	ipackidx.len = packidx->len;
841 	fd = dup(packidx->fd);
842 	if (fd == -1)
843 		return got_error_from_errno();
844 
845 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
846 	    sizeof(ipackidx)) == -1)
847 		return got_error_from_errno();
848 
849 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
850 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
851 		return got_error(GOT_ERR_NO_SPACE);
852 	ipack.filesize = pack->filesize;
853 
854 	fd = dup(pack->fd);
855 	if (fd == -1)
856 		return got_error_from_errno();
857 
858 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
859 	    == -1)
860 		return got_error_from_errno();
861 
862 	return flush_imsg(ibuf);
863 }
864 
865 const struct got_error *
866 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx,
867     struct got_object_id *id)
868 {
869 	struct got_imsg_packed_object iobj;
870 
871 	iobj.idx = idx;
872 	memcpy(iobj.id, id->sha1, sizeof(iobj.id));
873 
874 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
875 	    &iobj, sizeof(iobj)) == -1)
876 		return got_error_from_errno();
877 
878 	return flush_imsg(ibuf);
879 }