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Date:: Tue Sep 11 10:29:46 2018 UTC
Message:: stop sending deltas in imsg; cache deltas in got-read-pack
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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, size_t min_datalen)
111 {
112 	const struct got_error *err;
113 	ssize_t n;
114 
115 	n = imsg_get(ibuf, imsg);
116 	if (n == -1)
117 		return got_error_from_errno();
118 
119 	while (n == 0) {
120 		err = read_imsg(ibuf);
121 		if (err)
122 			return err;
123 		n = imsg_get(ibuf, imsg);
124 	}
125 
126 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
127 		return got_error(GOT_ERR_PRIVSEP_LEN);
128 
129 	return NULL;
130 }
131 
132 static const struct got_error *
133 recv_imsg_error(struct imsg *imsg, size_t datalen)
134 {
135 	struct got_imsg_error ierr;
136 
137 	if (datalen != sizeof(ierr))
138 		return got_error(GOT_ERR_PRIVSEP_LEN);
139 
140 	memcpy(&ierr, imsg->data, sizeof(ierr));
141 	if (ierr.code == GOT_ERR_ERRNO) {
142 		static struct got_error serr;
143 		serr.code = GOT_ERR_ERRNO;
144 		serr.msg = strerror(ierr.errno_code);
145 		return &serr;
146 	}
147 
148 	return got_error(ierr.code);
149 }
150 
151 /* Attempt to send an error in an imsg. Complain on stderr as a last resort. */
152 void
153 got_privsep_send_error(struct imsgbuf *ibuf, const struct got_error *err)
154 {
155 	const struct got_error *poll_err;
156 	struct got_imsg_error ierr;
157 	int ret;
158 
159 	ierr.code = err->code;
160 	if (err->code == GOT_ERR_ERRNO)
161 		ierr.errno_code = errno;
162 	else
163 		ierr.errno_code = 0;
164 	ret = imsg_compose(ibuf, GOT_IMSG_ERROR, 0, 0, -1, &ierr, sizeof(ierr));
165 	if (ret != -1) {
166 		fprintf(stderr, "%s: error %d \"%s\": imsg_compose: %s\n",
167 		    getprogname(), err->code, err->msg, strerror(errno));
168 		return;
169 	}
170 
171 	poll_err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
172 	if (poll_err) {
173 		fprintf(stderr, "%s: error %d \"%s\": poll: %s\n",
174 		    getprogname(), err->code, err->msg, poll_err->msg);
175 		return;
176 	}
177 
178 	ret = imsg_flush(ibuf);
179 	if (ret == -1) {
180 		fprintf(stderr, "%s: error %d \"%s\": imsg_flush: %s\n",
181 		    getprogname(), err->code, err->msg, strerror(errno));
182 		return;
183 	}
184 }
185 
186 static const struct got_error *
187 flush_imsg(struct imsgbuf *ibuf)
188 {
189 	const struct got_error *err;
190 
191 	err = poll_fd(ibuf->fd, POLLOUT, INFTIM);
192 	if (err)
193 		return err;
194 
195 	if (imsg_flush(ibuf) == -1)
196 		return got_error_from_errno();
197 
198 	return NULL;
199 }
200 
201 const struct got_error *
202 got_privsep_send_stop(int fd)
203 {
204 	const struct got_error *err = NULL;
205 	struct imsgbuf ibuf;
206 
207 	imsg_init(&ibuf, fd);
208 
209 	if (imsg_compose(&ibuf, GOT_IMSG_STOP, 0, 0, -1, NULL, 0) == -1)
210 		return got_error_from_errno();
211 
212 	err = flush_imsg(&ibuf);
213 	imsg_clear(&ibuf);
214 	return err;
215 }
216 
217 const struct got_error *
218 got_privsep_send_obj_req(struct imsgbuf *ibuf, int fd, struct got_object *obj)
219 {
220 	struct got_imsg_object iobj, *iobjp = NULL;
221 	size_t iobj_size = 0;
222 	int imsg_code = GOT_IMSG_OBJECT_REQUEST;
223 
224 	if (obj) {
225 		switch (obj->type) {
226 		case GOT_OBJ_TYPE_TREE:
227 			imsg_code = GOT_IMSG_TREE_REQUEST;
228 			break;
229 		case GOT_OBJ_TYPE_COMMIT:
230 			imsg_code = GOT_IMSG_COMMIT_REQUEST;
231 			break;
232 		case GOT_OBJ_TYPE_BLOB:
233 			imsg_code = GOT_IMSG_BLOB_REQUEST;
234 			break;
235 		default:
236 			return got_error(GOT_ERR_OBJ_TYPE);
237 		}
238 
239 		memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
240 		iobj.type = obj->type;
241 		iobj.flags = obj->flags;
242 		iobj.hdrlen = obj->hdrlen;
243 		iobj.size = obj->size;
244 		if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
245 			iobj.pack_offset = obj->pack_offset;
246 			iobj.pack_idx = obj->pack_idx;
247 		}
248 
249 		iobjp = &iobj;
250 		iobj_size = sizeof(iobj);
251 	}
252 
253 	if (imsg_compose(ibuf, imsg_code, 0, 0, fd, iobjp, iobj_size) == -1)
254 		return got_error_from_errno();
255 
256 	return flush_imsg(ibuf);
257 }
258 
259 const struct got_error *
260 got_privsep_send_blob_req(struct imsgbuf *ibuf, int infd)
261 {
262 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_REQUEST, 0, 0, infd, NULL, 0)
263 	    == -1)
264 		return got_error_from_errno();
265 
266 	return flush_imsg(ibuf);
267 }
268 
269 const struct got_error *
270 got_privsep_send_blob_outfd(struct imsgbuf *ibuf, int outfd)
271 {
272 	if (imsg_compose(ibuf, GOT_IMSG_BLOB_OUTFD, 0, 0, outfd, NULL, 0)
273 	    == -1)
274 		return got_error_from_errno();
275 
276 	return flush_imsg(ibuf);
277 }
278 
279 const struct got_error *
280 got_privsep_send_obj(struct imsgbuf *ibuf, struct got_object *obj)
281 {
282 	struct got_imsg_object iobj;
283 
284 	memcpy(iobj.id, obj->id.sha1, sizeof(iobj.id));
285 	iobj.type = obj->type;
286 	iobj.flags = obj->flags;
287 	iobj.hdrlen = obj->hdrlen;
288 	iobj.size = obj->size;
289 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
290 		iobj.pack_offset = obj->pack_offset;
291 		iobj.pack_idx = obj->pack_idx;
292 	}
293 
294 	if (imsg_compose(ibuf, GOT_IMSG_OBJECT, 0, 0, -1, &iobj, sizeof(iobj))
295 	    == -1)
296 		return got_error_from_errno();
297 
298 	return flush_imsg(ibuf);
299 }
300 
301 const struct got_error *
302 got_privsep_get_imsg_obj(struct got_object **obj, struct imsg *imsg,
303     struct imsgbuf *ibuf)
304 {
305 	const struct got_error *err = NULL;
306 	struct got_imsg_object iobj;
307 	size_t datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
308 
309 	if (datalen != sizeof(iobj))
310 		return got_error(GOT_ERR_PRIVSEP_LEN);
311 
312 	memcpy(&iobj, imsg->data, sizeof(iobj));
313 
314 	*obj = calloc(1, sizeof(**obj));
315 	if (*obj == NULL)
316 		return got_error_from_errno();
317 
318 	memcpy((*obj)->id.sha1, iobj.id, SHA1_DIGEST_LENGTH);
319 	(*obj)->type = iobj.type;
320 	(*obj)->flags = iobj.flags;
321 	(*obj)->hdrlen = iobj.hdrlen;
322 	(*obj)->size = iobj.size;
323 	/* path_packfile is handled by caller */
324 	if (iobj.flags & GOT_OBJ_FLAG_PACKED) {
325 		(*obj)->pack_offset = iobj.pack_offset;
326 		(*obj)->pack_idx = iobj.pack_idx;
327 	}
328 
329 	return err;
330 }
331 
332 const struct got_error *
333 got_privsep_recv_obj(struct got_object **obj, struct imsgbuf *ibuf)
334 {
335 	const struct got_error *err = NULL;
336 	struct imsg imsg;
337 	size_t datalen;
338 	const size_t min_datalen =
339 	    MIN(sizeof(struct got_imsg_error), sizeof(struct got_imsg_object));
340 
341 	*obj = NULL;
342 
343 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
344 	if (err)
345 		return err;
346 
347 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
348 
349 	switch (imsg.hdr.type) {
350 	case GOT_IMSG_ERROR:
351 		err = recv_imsg_error(&imsg, datalen);
352 		break;
353 	case GOT_IMSG_OBJECT:
354 		err = got_privsep_get_imsg_obj(obj, &imsg, ibuf);
355 		break;
356 	default:
357 		err = got_error(GOT_ERR_PRIVSEP_MSG);
358 		break;
359 	}
360 
361 	imsg_free(&imsg);
362 
363 	return err;
364 }
365 
366 const struct got_error *
367 got_privsep_send_commit(struct imsgbuf *ibuf, struct got_commit_object *commit)
368 {
369 	const struct got_error *err = NULL;
370 	struct got_imsg_commit_object icommit;
371 	uint8_t *buf;
372 	size_t len, total;
373 	struct got_object_qid *qid;
374 
375 	memcpy(icommit.tree_id, commit->tree_id->sha1, sizeof(icommit.tree_id));
376 	icommit.author_len = strlen(commit->author);
377 	memcpy(&icommit.tm_author, &commit->tm_author,
378 	    sizeof(icommit.tm_author));
379 	icommit.committer_len = strlen(commit->committer);
380 	memcpy(&icommit.tm_committer, &commit->tm_committer,
381 	    sizeof(icommit.tm_committer));
382 	icommit.logmsg_len = strlen(commit->logmsg);
383 	icommit.nparents = commit->nparents;
384 
385 	total = sizeof(icommit) + icommit.author_len +
386 	    icommit.committer_len + icommit.logmsg_len +
387 	    icommit.nparents * SHA1_DIGEST_LENGTH;
388 	/* XXX TODO support very large log messages properly */
389 	if (total > MAX_IMSGSIZE)
390 		return got_error(GOT_ERR_NO_SPACE);
391 
392 	buf = malloc(total);
393 	if (buf == NULL)
394 		return got_error_from_errno();
395 
396 	len = 0;
397 	memcpy(buf + len, &icommit, sizeof(icommit));
398 	len += sizeof(icommit);
399 	memcpy(buf + len, commit->author, icommit.author_len);
400 	len += icommit.author_len;
401 	memcpy(buf + len, commit->committer, icommit.committer_len);
402 	len += icommit.committer_len;
403 	memcpy(buf + len, commit->logmsg, icommit.logmsg_len);
404 	len += icommit.logmsg_len;
405 	SIMPLEQ_FOREACH(qid, &commit->parent_ids, entry) {
406 		memcpy(buf + len, qid->id, SHA1_DIGEST_LENGTH);
407 		len += SHA1_DIGEST_LENGTH;
408 	}
409 
410 	if (imsg_compose(ibuf, GOT_IMSG_COMMIT, 0, 0, -1, buf, len) == -1) {
411 		err = got_error_from_errno();
412 		goto done;
413 	}
414 
415 	err = flush_imsg(ibuf);
416 done:
417 	free(buf);
418 	return err;
419 }
420 
421 const struct got_error *
422 got_privsep_recv_commit(struct got_commit_object **commit, struct imsgbuf *ibuf)
423 {
424 	const struct got_error *err = NULL;
425 	struct imsg imsg;
426 	struct got_imsg_commit_object icommit;
427 	size_t len, datalen;
428 	int i;
429 	const size_t min_datalen =
430 	    MIN(sizeof(struct got_imsg_error),
431 	    sizeof(struct got_imsg_commit_object));
432 	uint8_t *data;
433 
434 	*commit = NULL;
435 
436 	err = got_privsep_recv_imsg(&imsg, ibuf, min_datalen);
437 	if (err)
438 		return err;
439 
440 	data = imsg.data;
441 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
442 	len = 0;
443 
444 	switch (imsg.hdr.type) {
445 	case GOT_IMSG_ERROR:
446 		err = recv_imsg_error(&imsg, datalen);
447 		break;
448 	case GOT_IMSG_COMMIT:
449 		if (datalen < sizeof(icommit)) {
450 			err = got_error(GOT_ERR_PRIVSEP_LEN);
451 			break;
452 		}
453 
454 		memcpy(&icommit, data, sizeof(icommit));
455 		if (datalen != sizeof(icommit) + icommit.author_len +
456 		    icommit.committer_len + icommit.logmsg_len +
457 		    icommit.nparents * SHA1_DIGEST_LENGTH) {
458 			err = got_error(GOT_ERR_PRIVSEP_LEN);
459 			break;
460 		}
461 		if (icommit.nparents < 0) {
462 			err = got_error(GOT_ERR_PRIVSEP_LEN);
463 			break;
464 		}
465 		len += sizeof(icommit);
466 
467 		*commit = got_object_commit_alloc_partial();
468 		if (*commit == NULL) {
469 			err = got_error_from_errno();
470 			break;
471 		}
472 
473 		memcpy((*commit)->tree_id->sha1, icommit.tree_id,
474 		    SHA1_DIGEST_LENGTH);
475 		memcpy(&(*commit)->tm_author, &icommit.tm_author,
476 		    sizeof((*commit)->tm_author));
477 		memcpy(&(*commit)->tm_committer, &icommit.tm_committer,
478 		    sizeof((*commit)->tm_committer));
479 
480 		if (icommit.author_len == 0) {
481 			(*commit)->author = strdup("");
482 			if ((*commit)->author == NULL) {
483 				err = got_error_from_errno();
484 				break;
485 			}
486 		} else {
487 			(*commit)->author = malloc(icommit.author_len + 1);
488 			if ((*commit)->author == NULL) {
489 				err = got_error_from_errno();
490 				break;
491 			}
492 			memcpy((*commit)->author, data + len,
493 			    icommit.author_len);
494 			(*commit)->author[icommit.author_len] = '\0';
495 		}
496 		len += icommit.author_len;
497 
498 		if (icommit.committer_len == 0) {
499 			(*commit)->committer = strdup("");
500 			if ((*commit)->committer == NULL) {
501 				err = got_error_from_errno();
502 				break;
503 			}
504 		} else {
505 			(*commit)->committer =
506 			    malloc(icommit.committer_len + 1);
507 			if ((*commit)->committer == NULL) {
508 				err = got_error_from_errno();
509 				break;
510 			}
511 			memcpy((*commit)->committer, data + len,
512 			    icommit.committer_len);
513 			(*commit)->committer[icommit.committer_len] = '\0';
514 		}
515 		len += icommit.committer_len;
516 
517 		if (icommit.logmsg_len == 0) {
518 			(*commit)->logmsg = strdup("");
519 			if ((*commit)->logmsg == NULL) {
520 				err = got_error_from_errno();
521 				break;
522 			}
523 		} else {
524 			(*commit)->logmsg = malloc(icommit.logmsg_len + 1);
525 			if ((*commit)->logmsg == NULL) {
526 				err = got_error_from_errno();
527 				break;
528 			}
529 			memcpy((*commit)->logmsg, data + len,
530 			    icommit.logmsg_len);
531 			(*commit)->logmsg[icommit.logmsg_len] = '\0';
532 		}
533 		len += icommit.logmsg_len;
534 
535 		for (i = 0; i < icommit.nparents; i++) {
536 			struct got_object_qid *qid;
537 
538 			qid = calloc(1, sizeof(*qid));
539 			if (qid == NULL) {
540 				err = got_error_from_errno();
541 				break;
542 			}
543 			qid->id = calloc(1, sizeof(*qid->id));
544 			if (qid->id == NULL) {
545 				err = got_error_from_errno();
546 				free(qid);
547 				break;
548 			}
549 
550 			memcpy(qid->id, data + len + i * SHA1_DIGEST_LENGTH,
551 			    sizeof(*qid->id));
552 			SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, qid, entry);
553 			(*commit)->nparents++;
554 		}
555 		break;
556 	default:
557 		err = got_error(GOT_ERR_PRIVSEP_MSG);
558 		break;
559 	}
560 
561 	imsg_free(&imsg);
562 
563 	return err;
564 }
565 
566 const struct got_error *
567 got_privsep_send_tree(struct imsgbuf *ibuf, struct got_tree_object *tree)
568 {
569 	const struct got_error *err = NULL;
570 	struct got_imsg_tree_object itree;
571 	struct got_tree_entry *te;
572 
573 	itree.nentries = tree->entries.nentries;
574 	if (imsg_compose(ibuf, GOT_IMSG_TREE, 0, 0, -1, &itree, sizeof(itree))
575 	    == -1)
576 		return got_error_from_errno();
577 
578 	err = flush_imsg(ibuf);
579 	if (err)
580 		return err;
581 
582 	SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
583 		struct got_imsg_tree_entry ite;
584 		uint8_t *buf = NULL;
585 		size_t len = sizeof(ite) + strlen(te->name);
586 
587 		if (len > MAX_IMSGSIZE)
588 			return got_error(GOT_ERR_NO_SPACE);
589 
590 		buf = malloc(len);
591 		if (buf == NULL)
592 			return got_error_from_errno();
593 
594 		memcpy(ite.id, te->id->sha1, sizeof(ite.id));
595 		ite.mode = te->mode;
596 		memcpy(buf, &ite, sizeof(ite));
597 		memcpy(buf + sizeof(ite), te->name, strlen(te->name));
598 
599 		if (imsg_compose(ibuf, GOT_IMSG_TREE_ENTRY, 0, 0, -1,
600 		    buf, len) == -1)
601 			err = got_error_from_errno();
602 		free(buf);
603 		if (err)
604 			return err;
605 
606 		err = flush_imsg(ibuf);
607 		if (err)
608 			return err;
609 	}
610 
611 	return NULL;
612 }
613 
614 const struct got_error *
615 got_privsep_recv_tree(struct got_tree_object **tree, struct imsgbuf *ibuf)
616 {
617 	const struct got_error *err = NULL;
618 	const size_t min_datalen =
619 	    MIN(sizeof(struct got_imsg_error),
620 	    sizeof(struct got_imsg_tree_object));
621 	struct got_imsg_tree_object itree = { 0 };
622 	int nentries = 0;
623 
624 	*tree = NULL;
625 get_more:
626 	err = read_imsg(ibuf);
627 	if (err)
628 		goto done;
629 
630 	while (1) {
631 		struct imsg imsg;
632 		size_t n;
633 		size_t datalen;
634 		struct got_imsg_tree_entry ite;
635 		struct got_tree_entry *te = NULL;
636 
637 		n = imsg_get(ibuf, &imsg);
638 		if (n == 0) {
639 			if (*tree && (*tree)->entries.nentries != nentries)
640 				goto get_more;
641 			break;
642 		}
643 
644 		if (imsg.hdr.len < IMSG_HEADER_SIZE + min_datalen)
645 			return got_error(GOT_ERR_PRIVSEP_LEN);
646 
647 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
648 
649 		switch (imsg.hdr.type) {
650 		case GOT_IMSG_ERROR:
651 			err = recv_imsg_error(&imsg, datalen);
652 			break;
653 		case GOT_IMSG_TREE:
654 			/* This message should only appear once. */
655 			if (*tree != NULL) {
656 				err = got_error(GOT_ERR_PRIVSEP_MSG);
657 				break;
658 			}
659 			if (datalen != sizeof(itree)) {
660 				err = got_error(GOT_ERR_PRIVSEP_LEN);
661 				break;
662 			}
663 			memcpy(&itree, imsg.data, sizeof(itree));
664 			*tree = calloc(1, sizeof(**tree));
665 			if (*tree == NULL) {
666 				err = got_error_from_errno();
667 				break;
668 			}
669 			(*tree)->entries.nentries = itree.nentries;
670 			SIMPLEQ_INIT(&(*tree)->entries.head);
671 			break;
672 		case GOT_IMSG_TREE_ENTRY:
673 			/* This message should be preceeded by GOT_IMSG_TREE. */
674 			if (*tree == NULL) {
675 				err = got_error(GOT_ERR_PRIVSEP_MSG);
676 				break;
677 			}
678 			if (datalen < sizeof(ite) || datalen > MAX_IMSGSIZE) {
679 				err = got_error(GOT_ERR_PRIVSEP_LEN);
680 				break;
681 			}
682 
683 			/* Remaining data contains the entry's name. */
684 			datalen -= sizeof(ite);
685 			memcpy(&ite, imsg.data, sizeof(ite));
686 			if (datalen == 0 || datalen > MAX_IMSGSIZE) {
687 				err = got_error(GOT_ERR_PRIVSEP_LEN);
688 				break;
689 			}
690 
691 			te = got_alloc_tree_entry_partial();
692 			if (te == NULL) {
693 				err = got_error_from_errno();
694 				break;
695 			}
696 			te->name = malloc(datalen + 1);
697 			if (te->name == NULL) {
698 				free(te);
699 				err = got_error_from_errno();
700 				break;
701 			}
702 			memcpy(te->name, imsg.data + sizeof(ite), datalen);
703 			te->name[datalen] = '\0';
704 
705 			memcpy(te->id->sha1, ite.id, SHA1_DIGEST_LENGTH);
706 			te->mode = ite.mode;
707 			SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
708 			nentries++;
709 			break;
710 		default:
711 			err = got_error(GOT_ERR_PRIVSEP_MSG);
712 			break;
713 		}
714 
715 		imsg_free(&imsg);
716 	}
717 done:
718 	if (*tree && (*tree)->entries.nentries != nentries) {
719 		if (err == NULL)
720 			err = got_error(GOT_ERR_PRIVSEP_LEN);
721 		got_object_tree_close(*tree);
722 		*tree = NULL;
723 	}
724 
725 	return err;
726 }
727 
728 const struct got_error *
729 got_privsep_send_blob(struct imsgbuf *ibuf, size_t size)
730 {
731 	struct got_imsg_blob iblob;
732 
733 	iblob.size = size;
734 	/* Data has already been written to file descriptor. */
735 
736 	if (imsg_compose(ibuf, GOT_IMSG_BLOB, 0, 0, -1, &iblob, sizeof(iblob))
737 	    == -1)
738 		return got_error_from_errno();
739 
740 	return flush_imsg(ibuf);
741 }
742 
743 const struct got_error *
744 got_privsep_recv_blob(size_t *size, struct imsgbuf *ibuf)
745 {
746 	const struct got_error *err = NULL;
747 	struct imsg imsg;
748 	struct got_imsg_blob iblob;
749 	size_t datalen;
750 
751 	err = got_privsep_recv_imsg(&imsg, ibuf, 0);
752 	if (err)
753 		return err;
754 
755 	datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
756 
757 	switch (imsg.hdr.type) {
758 	case GOT_IMSG_ERROR:
759 		err = recv_imsg_error(&imsg, datalen);
760 		break;
761 	case GOT_IMSG_BLOB:
762 		if (datalen != sizeof(iblob))
763 			err = got_error(GOT_ERR_PRIVSEP_LEN);
764 		memcpy(&iblob, imsg.data, sizeof(iblob));
765 		*size = iblob.size;
766 		/* Data has been written to file descriptor. */
767 		break;
768 	default:
769 		err = got_error(GOT_ERR_PRIVSEP_MSG);
770 		break;
771 	}
772 
773 	imsg_free(&imsg);
774 
775 	return err;
776 }
777 
778 const struct got_error *
779 got_privsep_init_pack_child(struct imsgbuf *ibuf, struct got_pack *pack,
780     struct got_packidx *packidx)
781 {
782 	struct got_imsg_packidx ipackidx;
783 	struct got_imsg_pack ipack;
784 	int fd;
785 
786 	ipackidx.len = packidx->len;
787 	fd = dup(packidx->fd);
788 	if (fd == -1)
789 		return got_error_from_errno();
790 
791 	if (imsg_compose(ibuf, GOT_IMSG_PACKIDX, 0, 0, fd, &ipackidx,
792 	    sizeof(ipackidx)) == -1)
793 		return got_error_from_errno();
794 
795 	if (strlcpy(ipack.path_packfile, pack->path_packfile,
796 	    sizeof(ipack.path_packfile)) >= sizeof(ipack.path_packfile))
797 		return got_error(GOT_ERR_NO_SPACE);
798 	ipack.filesize = pack->filesize;
799 
800 	fd = dup(pack->fd);
801 	if (fd == -1)
802 		return got_error_from_errno();
803 
804 	if (imsg_compose(ibuf, GOT_IMSG_PACK, 0, 0, fd, &ipack, sizeof(ipack))
805 	    == -1)
806 		return got_error_from_errno();
807 
808 	return flush_imsg(ibuf);
809 }
810 
811 const struct got_error *
812 got_privsep_send_packed_obj_req(struct imsgbuf *ibuf, int idx)
813 {
814 	struct got_imsg_packed_object iobj;
815 
816 	iobj.idx = idx;
817 
818 	if (imsg_compose(ibuf, GOT_IMSG_PACKED_OBJECT_REQUEST, 0, 0, -1,
819 	    &iobj, sizeof(iobj)) == -1)
820 		return got_error_from_errno();
821 
822 	return flush_imsg(ibuf);
823 }