1 /*
2  * Copyright (c) 2018, 2019 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/stat.h>
19 #include <sys/queue.h>
20 #include <sys/uio.h>
21 #include <sys/socket.h>
22 #include <sys/syslimits.h>
23 #include <sys/wait.h>
24 
25 #include <errno.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdint.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 #include <ctype.h>
33 #include <limits.h>
34 #include <imsg.h>
35 #include <time.h>
36 #include <unistd.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_repository.h"
41 #include "got_opentemp.h"
42 #include "got_path.h"
43 
44 #include "got_lib_sha1.h"
45 #include "got_lib_delta.h"
46 #include "got_lib_inflate.h"
47 #include "got_lib_object.h"
48 #include "got_lib_object_cache.h"
49 #include "got_lib_pack.h"
50 #include "got_lib_privsep.h"
51 #include "got_lib_repository.h"
52 
53 #ifndef nitems
54 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
55 #endif
56 
57 int
58 got_object_id_cmp(const struct got_object_id *id1,
59     const struct got_object_id *id2)
60 {
61 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
62 }
63 
64 const struct got_error *
65 got_object_qid_alloc_partial(struct got_object_qid **qid)
66 {
67 	const struct got_error *err = NULL;
68 
69 	*qid = malloc(sizeof(**qid));
70 	if (*qid == NULL)
71 		return got_error_from_errno("malloc");
72 
73 	(*qid)->id = malloc(sizeof(*((*qid)->id)));
74 	if ((*qid)->id == NULL) {
75 		err = got_error_from_errno("malloc");
76 		got_object_qid_free(*qid);
77 		*qid = NULL;
78 		return err;
79 	}
80 
81 	return NULL;
82 }
83 
84 const struct got_error *
85 got_object_id_str(char **outbuf, struct got_object_id *id)
86 {
87 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
88 
89 	*outbuf = malloc(len);
90 	if (*outbuf == NULL)
91 		return got_error_from_errno("malloc");
92 
93 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
94 		free(*outbuf);
95 		*outbuf = NULL;
96 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
97 	}
98 
99 	return NULL;
100 }
101 
102 void
103 got_object_close(struct got_object *obj)
104 {
105 	if (obj->refcnt > 0) {
106 		obj->refcnt--;
107 		if (obj->refcnt > 0)
108 			return;
109 	}
110 
111 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
112 		struct got_delta *delta;
113 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
114 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
115 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
116 			free(delta->delta_buf);
117 			free(delta);
118 		}
119 	}
120 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
121 		free(obj->path_packfile);
122 	free(obj);
123 }
124 
125 void
126 got_object_qid_free(struct got_object_qid *qid)
127 {
128 	free(qid->id);
129 	free(qid);
130 }
131 
132 void
133 got_object_id_queue_free(struct got_object_id_queue *ids)
134 {
135 	struct got_object_qid *qid;
136 
137 	while (!SIMPLEQ_EMPTY(ids)) {
138 		qid = SIMPLEQ_FIRST(ids);
139 		SIMPLEQ_REMOVE_HEAD(ids, entry);
140 		got_object_qid_free(qid);
141 	}
142 }
143 
144 const struct got_error *
145 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
146 {
147 	const char *obj_labels[] = {
148 		GOT_OBJ_LABEL_COMMIT,
149 		GOT_OBJ_LABEL_TREE,
150 		GOT_OBJ_LABEL_BLOB,
151 		GOT_OBJ_LABEL_TAG,
152 	};
153 	const int obj_types[] = {
154 		GOT_OBJ_TYPE_COMMIT,
155 		GOT_OBJ_TYPE_TREE,
156 		GOT_OBJ_TYPE_BLOB,
157 		GOT_OBJ_TYPE_TAG,
158 	};
159 	int type = 0;
160 	size_t size = 0, hdrlen = 0;
161 	int i;
162 
163 	*obj = NULL;
164 
165 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
166 	if (hdrlen > len)
167 		return got_error(GOT_ERR_BAD_OBJ_HDR);
168 
169 	for (i = 0; i < nitems(obj_labels); i++) {
170 		const char *label = obj_labels[i];
171 		size_t label_len = strlen(label);
172 		const char *errstr;
173 
174 		if (strncmp(buf, label, label_len) != 0)
175 			continue;
176 
177 		type = obj_types[i];
178 		if (len <= label_len)
179 			return got_error(GOT_ERR_BAD_OBJ_HDR);
180 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
181 		if (errstr != NULL)
182 			return got_error(GOT_ERR_BAD_OBJ_HDR);
183 		break;
184 	}
185 
186 	if (type == 0)
187 		return got_error(GOT_ERR_BAD_OBJ_HDR);
188 
189 	*obj = calloc(1, sizeof(**obj));
190 	if (*obj == NULL)
191 		return got_error_from_errno("calloc");
192 	(*obj)->type = type;
193 	(*obj)->hdrlen = hdrlen;
194 	(*obj)->size = size;
195 	return NULL;
196 }
197 
198 const struct got_error *
199 got_object_read_header(struct got_object **obj, int fd)
200 {
201 	const struct got_error *err;
202 	struct got_inflate_buf zb;
203 	char *buf;
204 	const size_t zbsize = 64;
205 	size_t outlen, totlen;
206 	int nbuf = 1;
207 
208 	*obj = NULL;
209 
210 	buf = malloc(zbsize);
211 	if (buf == NULL)
212 		return got_error_from_errno("malloc");
213 
214 	err = got_inflate_init(&zb, buf, zbsize);
215 	if (err)
216 		return err;
217 
218 	totlen = 0;
219 	do {
220 		err = got_inflate_read_fd(&zb, fd, &outlen);
221 		if (err)
222 			goto done;
223 		if (outlen == 0)
224 			break;
225 		totlen += outlen;
226 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
227 			char *newbuf;
228 			nbuf++;
229 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
230 			if (newbuf == NULL) {
231 				err = got_error_from_errno("recallocarray");
232 				goto done;
233 			}
234 			buf = newbuf;
235 			zb.outbuf = newbuf + totlen;
236 			zb.outlen = (nbuf * zbsize) - totlen;
237 		}
238 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
239 
240 	err = got_object_parse_header(obj, buf, totlen);
241 done:
242 	free(buf);
243 	got_inflate_end(&zb);
244 	return err;
245 }
246 
247 struct got_commit_object *
248 got_object_commit_alloc_partial(void)
249 {
250 	struct got_commit_object *commit;
251 
252 	commit = calloc(1, sizeof(*commit));
253 	if (commit == NULL)
254 		return NULL;
255 	commit->tree_id = malloc(sizeof(*commit->tree_id));
256 	if (commit->tree_id == NULL) {
257 		free(commit);
258 		return NULL;
259 	}
260 
261 	SIMPLEQ_INIT(&commit->parent_ids);
262 
263 	return commit;
264 }
265 
266 const struct got_error *
267 got_object_commit_add_parent(struct got_commit_object *commit,
268     const char *id_str)
269 {
270 	const struct got_error *err = NULL;
271 	struct got_object_qid *qid;
272 
273 	err = got_object_qid_alloc_partial(&qid);
274 	if (err)
275 		return err;
276 
277 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
278 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
279 		got_object_qid_free(qid);
280 		return err;
281 	}
282 
283 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
284 	commit->nparents++;
285 
286 	return NULL;
287 }
288 
289 static const struct got_error *
290 parse_gmtoff(time_t *gmtoff, const char *tzstr)
291 {
292 	int sign = 1;
293 	const char *p = tzstr;
294 	time_t h, m;
295 
296 	*gmtoff = 0;
297 
298 	if (*p == '-')
299 		sign = -1;
300 	else if (*p != '+')
301 		return got_error(GOT_ERR_BAD_OBJ_DATA);
302 	p++;
303 	if (!isdigit(*p) && !isdigit(*(p + 1)))
304 		return got_error(GOT_ERR_BAD_OBJ_DATA);
305 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
306 
307 	p += 2;
308 	if (!isdigit(*p) && !isdigit(*(p + 1)))
309 		return got_error(GOT_ERR_BAD_OBJ_DATA);
310 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
311 
312 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
313 	return NULL;
314 }
315 
316 static const struct got_error *
317 parse_commit_time(time_t *time, time_t *gmtoff, char *committer)
318 {
319 	const struct got_error *err = NULL;
320 	const char *errstr;
321 	char *space, *tzstr;
322 
323 	/* Parse and strip off trailing timezone indicator string. */
324 	space = strrchr(committer, ' ');
325 	if (space == NULL)
326 		return got_error(GOT_ERR_BAD_OBJ_DATA);
327 	tzstr = strdup(space + 1);
328 	if (tzstr == NULL)
329 		return got_error_from_errno("strdup");
330 	err = parse_gmtoff(gmtoff, tzstr);
331 	free(tzstr);
332 	if (err)
333 		return err;
334 	*space = '\0';
335 
336 	/* Timestamp is separated from committer name + email by space. */
337 	space = strrchr(committer, ' ');
338 	if (space == NULL)
339 		return got_error(GOT_ERR_BAD_OBJ_DATA);
340 
341 	/* Timestamp parsed here is expressed in comitter's local time. */
342 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
343 	if (errstr)
344 		return got_error(GOT_ERR_BAD_OBJ_DATA);
345 
346 	/* Express the time stamp in UTC. */
347 	*time -= *gmtoff;
348 
349 	/* Strip off parsed time information, leaving just author and email. */
350 	*space = '\0';
351 
352 	return NULL;
353 }
354 
355 void
356 got_object_commit_close(struct got_commit_object *commit)
357 {
358 	if (commit->refcnt > 0) {
359 		commit->refcnt--;
360 		if (commit->refcnt > 0)
361 			return;
362 	}
363 
364 	got_object_id_queue_free(&commit->parent_ids);
365 	free(commit->tree_id);
366 	free(commit->author);
367 	free(commit->committer);
368 	free(commit->logmsg);
369 	free(commit);
370 }
371 
372 struct got_object_id *
373 got_object_commit_get_tree_id(struct got_commit_object *commit)
374 {
375 	return commit->tree_id;
376 }
377 
378 int
379 got_object_commit_get_nparents(struct got_commit_object *commit)
380 {
381 	return commit->nparents;
382 }
383 
384 const struct got_object_id_queue *
385 got_object_commit_get_parent_ids(struct got_commit_object *commit)
386 {
387 	return &commit->parent_ids;
388 }
389 
390 const char *
391 got_object_commit_get_author(struct got_commit_object *commit)
392 {
393 	return commit->author;
394 }
395 
396 time_t
397 got_object_commit_get_author_time(struct got_commit_object *commit)
398 {
399 	return commit->author_time;
400 }
401 
402 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
403 {
404 	return commit->author_gmtoff;
405 }
406 
407 const char *
408 got_object_commit_get_committer(struct got_commit_object *commit)
409 {
410 	return commit->committer;
411 }
412 
413 time_t
414 got_object_commit_get_committer_time(struct got_commit_object *commit)
415 {
416 	return commit->committer_time;
417 }
418 
419 time_t
420 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
421 {
422 	return commit->committer_gmtoff;
423 }
424 
425 const char *
426 got_object_commit_get_logmsg(struct got_commit_object *commit)
427 {
428 	return commit->logmsg;
429 }
430 
431 const struct got_error *
432 got_object_parse_commit(struct got_commit_object **commit, char *buf,
433     size_t len)
434 {
435 	const struct got_error *err = NULL;
436 	char *s = buf;
437 	size_t label_len;
438 	ssize_t remain = (ssize_t)len;
439 
440 	*commit = got_object_commit_alloc_partial();
441 	if (*commit == NULL)
442 		return got_error_from_errno("got_object_commit_alloc_partial");
443 
444 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
445 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
446 		remain -= label_len;
447 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
448 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
449 			goto done;
450 		}
451 		s += label_len;
452 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
453 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
454 			goto done;
455 		}
456 		remain -= SHA1_DIGEST_STRING_LENGTH;
457 		s += SHA1_DIGEST_STRING_LENGTH;
458 	} else {
459 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
460 		goto done;
461 	}
462 
463 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
464 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
465 		remain -= label_len;
466 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
467 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
468 			goto done;
469 		}
470 		s += label_len;
471 		err = got_object_commit_add_parent(*commit, s);
472 		if (err)
473 			goto done;
474 
475 		remain -= SHA1_DIGEST_STRING_LENGTH;
476 		s += SHA1_DIGEST_STRING_LENGTH;
477 	}
478 
479 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
480 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
481 		char *p;
482 		size_t slen;
483 
484 		remain -= label_len;
485 		if (remain <= 0) {
486 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
487 			goto done;
488 		}
489 		s += label_len;
490 		p = memchr(s, '\n', remain);
491 		if (p == NULL) {
492 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
493 			goto done;
494 		}
495 		*p = '\0';
496 		slen = strlen(s);
497 		err = parse_commit_time(&(*commit)->author_time,
498 		    &(*commit)->author_gmtoff, s);
499 		if (err)
500 			goto done;
501 		(*commit)->author = strdup(s);
502 		if ((*commit)->author == NULL) {
503 			err = got_error_from_errno("strdup");
504 			goto done;
505 		}
506 		s += slen + 1;
507 		remain -= slen + 1;
508 	}
509 
510 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
511 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
512 		char *p;
513 		size_t slen;
514 
515 		remain -= label_len;
516 		if (remain <= 0) {
517 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
518 			goto done;
519 		}
520 		s += label_len;
521 		p = memchr(s, '\n', remain);
522 		if (p == NULL) {
523 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
524 			goto done;
525 		}
526 		*p = '\0';
527 		slen = strlen(s);
528 		err = parse_commit_time(&(*commit)->committer_time,
529 		    &(*commit)->committer_gmtoff, s);
530 		if (err)
531 			goto done;
532 		(*commit)->committer = strdup(s);
533 		if ((*commit)->committer == NULL) {
534 			err = got_error_from_errno("strdup");
535 			goto done;
536 		}
537 		s += slen + 1;
538 		remain -= slen + 1;
539 	}
540 
541 	(*commit)->logmsg = strndup(s, remain);
542 	if ((*commit)->logmsg == NULL) {
543 		err = got_error_from_errno("strndup");
544 		goto done;
545 	}
546 done:
547 	if (err) {
548 		got_object_commit_close(*commit);
549 		*commit = NULL;
550 	}
551 	return err;
552 }
553 
554 void
555 got_object_tree_entry_close(struct got_tree_entry *te)
556 {
557 	free(te->id);
558 	free(te->name);
559 	free(te);
560 }
561 
562 void
563 got_object_tree_entries_close(struct got_tree_entries *entries)
564 {
565 	struct got_tree_entry *te;
566 
567 	while (!SIMPLEQ_EMPTY(&entries->head)) {
568 		te = SIMPLEQ_FIRST(&entries->head);
569 		SIMPLEQ_REMOVE_HEAD(&entries->head, entry);
570 		got_object_tree_entry_close(te);
571 	}
572 }
573 
574 void
575 got_object_tree_close(struct got_tree_object *tree)
576 {
577 	if (tree->refcnt > 0) {
578 		tree->refcnt--;
579 		if (tree->refcnt > 0)
580 			return;
581 	}
582 
583 	got_object_tree_entries_close(&tree->entries);
584 	free(tree);
585 }
586 
587 struct got_tree_entry *
588 got_alloc_tree_entry_partial(void)
589 {
590 	struct got_tree_entry *te;
591 
592 	te = malloc(sizeof(*te));
593 	if (te == NULL)
594 		return NULL;
595 
596 	te->id = malloc(sizeof(*te->id));
597 	if (te->id == NULL) {
598 		free(te);
599 		te = NULL;
600 	}
601 	return te;
602 }
603 
604 static const struct got_error *
605 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
606     size_t maxlen)
607 {
608 	char *p, *space;
609 	const struct got_error *err = NULL;
610 
611 	*elen = 0;
612 
613 	*te = got_alloc_tree_entry_partial();
614 	if (*te == NULL)
615 		return got_error_from_errno("got_alloc_tree_entry_partial");
616 
617 	*elen = strnlen(buf, maxlen) + 1;
618 	if (*elen > maxlen) {
619 		free(*te);
620 		*te = NULL;
621 		return got_error(GOT_ERR_BAD_OBJ_DATA);
622 	}
623 
624 	space = memchr(buf, ' ', *elen);
625 	if (space == NULL || space <= buf) {
626 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
627 		free(*te);
628 		*te = NULL;
629 		return err;
630 	}
631 	(*te)->mode = 0;
632 	p = buf;
633 	while (p < space) {
634 		if (*p < '0' && *p > '7') {
635 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
636 			goto done;
637 		}
638 		(*te)->mode <<= 3;
639 		(*te)->mode |= *p - '0';
640 		p++;
641 	}
642 
643 	(*te)->name = strdup(space + 1);
644 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
645 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
646 		goto done;
647 	}
648 	buf += *elen;
649 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
650 	*elen += SHA1_DIGEST_LENGTH;
651 done:
652 	if (err) {
653 		got_object_tree_entry_close(*te);
654 		*te = NULL;
655 	}
656 	return err;
657 }
658 
659 const struct got_error *
660 got_object_parse_tree(struct got_tree_object **tree, uint8_t *buf, size_t len)
661 {
662 	const struct got_error *err;
663 	size_t remain = len;
664 	struct got_pathlist_head pathlist;
665 	struct got_pathlist_entry *pe;
666 
667 	TAILQ_INIT(&pathlist);
668 
669 	*tree = calloc(1, sizeof(**tree));
670 	if (*tree == NULL)
671 		return got_error_from_errno("calloc");
672 
673 	SIMPLEQ_INIT(&(*tree)->entries.head);
674 
675 	while (remain > 0) {
676 		struct got_tree_entry *te;
677 		struct got_pathlist_entry *new = NULL;
678 		size_t elen;
679 
680 		err = parse_tree_entry(&te, &elen, buf, remain);
681 		if (err)
682 			goto done;
683 		err = got_pathlist_insert(&new, &pathlist, te->name, te);
684 		if (err)
685 			goto done;
686 		if (new == NULL) {
687 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
688 			goto done;
689 		}
690 		buf += elen;
691 		remain -= elen;
692 	}
693 
694 	if (remain != 0) {
695 		got_object_tree_close(*tree);
696 		*tree = NULL;
697 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
698 		goto done;
699 	}
700 
701 	TAILQ_FOREACH(pe, &pathlist, entry) {
702 		struct got_tree_entry *te = pe->data;
703 		(*tree)->entries.nentries++;
704 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
705 	}
706 done:
707 	got_pathlist_free(&pathlist);
708 	return err;
709 }
710 
711 void
712 got_object_tag_close(struct got_tag_object *tag)
713 {
714 	if (tag->refcnt > 0) {
715 		tag->refcnt--;
716 		if (tag->refcnt > 0)
717 			return;
718 	}
719 
720 	free(tag->tag);
721 	free(tag->tagger);
722 	free(tag->tagmsg);
723 	free(tag);
724 }
725 
726 const struct got_error *
727 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
728 {
729 	const struct got_error *err = NULL;
730 	size_t remain = len;
731 	char *s = buf;
732 	size_t label_len;
733 
734 	*tag = calloc(1, sizeof(**tag));
735 	if (*tag == NULL)
736 		return got_error_from_errno("calloc");
737 
738 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
739 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
740 		remain -= label_len;
741 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
742 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
743 			goto done;
744 		}
745 		s += label_len;
746 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
747 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
748 			goto done;
749 		}
750 		remain -= SHA1_DIGEST_STRING_LENGTH;
751 		s += SHA1_DIGEST_STRING_LENGTH;
752 	} else {
753 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
754 		goto done;
755 	}
756 
757 	if (remain <= 0) {
758 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
759 		goto done;
760 	}
761 
762 	label_len = strlen(GOT_TAG_LABEL_TYPE);
763 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
764 		remain -= label_len;
765 		if (remain <= 0) {
766 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
767 			goto done;
768 		}
769 		s += label_len;
770 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
771 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
772 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
773 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
774 			s += label_len;
775 			remain -= label_len;
776 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
777 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
778 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
779 			label_len = strlen(GOT_OBJ_LABEL_TREE);
780 			s += label_len;
781 			remain -= label_len;
782 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
783 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
784 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
785 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
786 			s += label_len;
787 			remain -= label_len;
788 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
789 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
790 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
791 			label_len = strlen(GOT_OBJ_LABEL_TAG);
792 			s += label_len;
793 			remain -= label_len;
794 		} else {
795 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
796 			goto done;
797 		}
798 
799 		if (remain <= 0 || *s != '\n') {
800 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
801 			goto done;
802 		}
803 		s++;
804 		remain--;
805 		if (remain <= 0) {
806 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
807 			goto done;
808 		}
809 	} else {
810 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
811 		goto done;
812 	}
813 
814 	label_len = strlen(GOT_TAG_LABEL_TAG);
815 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
816 		char *p;
817 		size_t slen;
818 		remain -= label_len;
819 		if (remain <= 0) {
820 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
821 			goto done;
822 		}
823 		s += label_len;
824 		p = memchr(s, '\n', remain);
825 		if (p == NULL) {
826 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
827 			goto done;
828 		}
829 		*p = '\0';
830 		slen = strlen(s);
831 		(*tag)->tag = strndup(s, slen);
832 		if ((*tag)->tag == NULL) {
833 			err = got_error_from_errno("strndup");
834 			goto done;
835 		}
836 		s += slen + 1;
837 		remain -= slen + 1;
838 		if (remain <= 0) {
839 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
840 			goto done;
841 		}
842 	} else {
843 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
844 		goto done;
845 	}
846 
847 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
848 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
849 		char *p;
850 		size_t slen;
851 
852 		remain -= label_len;
853 		if (remain <= 0) {
854 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
855 			goto done;
856 		}
857 		s += label_len;
858 		p = memchr(s, '\n', remain);
859 		if (p == NULL) {
860 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
861 			goto done;
862 		}
863 		*p = '\0';
864 		slen = strlen(s);
865 		err = parse_commit_time(&(*tag)->tagger_time,
866 		    &(*tag)->tagger_gmtoff, s);
867 		if (err)
868 			goto done;
869 		(*tag)->tagger = strdup(s);
870 		if ((*tag)->tagger == NULL) {
871 			err = got_error_from_errno("strdup");
872 			goto done;
873 		}
874 		s += slen + 1;
875 		remain -= slen + 1;
876 		if (remain <= 0) {
877 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
878 			goto done;
879 		}
880 	} else {
881 		/* Some old tags in the Linux git repo have no tagger. */
882 		(*tag)->tagger = strdup("");
883 		if ((*tag)->tagger == NULL) {
884 			err = got_error_from_errno("strdup");
885 			goto done;
886 		}
887 	}
888 
889 	(*tag)->tagmsg = strndup(s, remain);
890 	if ((*tag)->tagmsg == NULL) {
891 		err = got_error_from_errno("strndup");
892 		goto done;
893 	}
894 done:
895 	if (err) {
896 		got_object_tag_close(*tag);
897 		*tag = NULL;
898 	}
899 	return err;
900 }
901 
902 const struct got_error *
903 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
904 {
905 	const struct got_error *err = NULL;
906 	static const size_t blocksize = 512;
907 	size_t n, total, remain;
908 	uint8_t *buf;
909 
910 	*outbuf = NULL;
911 	*outlen = 0;
912 
913 	buf = malloc(blocksize);
914 	if (buf == NULL)
915 		return got_error_from_errno("malloc");
916 
917 	remain = blocksize;
918 	total = 0;
919 	for (;;) {
920 		if (remain == 0) {
921 			uint8_t *newbuf;
922 			newbuf = reallocarray(buf, 1, total + blocksize);
923 			if (newbuf == NULL) {
924 				err = got_error_from_errno("reallocarray");
925 				goto done;
926 			}
927 			buf = newbuf;
928 			remain += blocksize;
929 		}
930 		n = fread(buf + total, 1, remain, f);
931 		if (n == 0) {
932 			if (ferror(f)) {
933 				err = got_ferror(f, GOT_ERR_IO);
934 				goto done;
935 			}
936 			break; /* EOF */
937 		}
938 		remain -= n;
939 		total += n;
940 	};
941 
942 done:
943 	if (err == NULL) {
944 		*outbuf = buf;
945 		*outlen = total;
946 	} else
947 		free(buf);
948 	return err;
949 }