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Date:: Mon May 13 16:40:57 2019 UTC
Message:: rename got_error_prefix_errno() to got_error_from_errno()
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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 			got_delta_close(delta);
117 		}
118 	}
119 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
120 		free(obj->path_packfile);
121 	free(obj);
122 }
123 
124 void
125 got_object_qid_free(struct got_object_qid *qid)
126 {
127 	free(qid->id);
128 	free(qid);
129 }
130 
131 const struct got_error *
132 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
133 {
134 	const char *obj_labels[] = {
135 		GOT_OBJ_LABEL_COMMIT,
136 		GOT_OBJ_LABEL_TREE,
137 		GOT_OBJ_LABEL_BLOB,
138 		GOT_OBJ_LABEL_TAG,
139 	};
140 	const int obj_types[] = {
141 		GOT_OBJ_TYPE_COMMIT,
142 		GOT_OBJ_TYPE_TREE,
143 		GOT_OBJ_TYPE_BLOB,
144 		GOT_OBJ_TYPE_TAG,
145 	};
146 	int type = 0;
147 	size_t size = 0, hdrlen = 0;
148 	int i;
149 
150 	*obj = NULL;
151 
152 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
153 	if (hdrlen > len)
154 		return got_error(GOT_ERR_BAD_OBJ_HDR);
155 
156 	for (i = 0; i < nitems(obj_labels); i++) {
157 		const char *label = obj_labels[i];
158 		size_t label_len = strlen(label);
159 		const char *errstr;
160 
161 		if (strncmp(buf, label, label_len) != 0)
162 			continue;
163 
164 		type = obj_types[i];
165 		if (len <= label_len)
166 			return got_error(GOT_ERR_BAD_OBJ_HDR);
167 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
168 		if (errstr != NULL)
169 			return got_error(GOT_ERR_BAD_OBJ_HDR);
170 		break;
171 	}
172 
173 	if (type == 0)
174 		return got_error(GOT_ERR_BAD_OBJ_HDR);
175 
176 	*obj = calloc(1, sizeof(**obj));
177 	if (*obj == NULL)
178 		return got_error_from_errno("calloc");
179 	(*obj)->type = type;
180 	(*obj)->hdrlen = hdrlen;
181 	(*obj)->size = size;
182 	return NULL;
183 }
184 
185 const struct got_error *
186 got_object_read_header(struct got_object **obj, int fd)
187 {
188 	const struct got_error *err;
189 	struct got_inflate_buf zb;
190 	char *buf;
191 	const size_t zbsize = 64;
192 	size_t outlen, totlen;
193 	int nbuf = 1;
194 
195 	*obj = NULL;
196 
197 	buf = malloc(zbsize);
198 	if (buf == NULL)
199 		return got_error_from_errno("malloc");
200 
201 	err = got_inflate_init(&zb, buf, zbsize);
202 	if (err)
203 		return err;
204 
205 	totlen = 0;
206 	do {
207 		err = got_inflate_read_fd(&zb, fd, &outlen);
208 		if (err)
209 			goto done;
210 		if (outlen == 0)
211 			break;
212 		totlen += outlen;
213 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
214 			char *newbuf;
215 			nbuf++;
216 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
217 			if (newbuf == NULL) {
218 				err = got_error_from_errno("recallocarray");
219 				goto done;
220 			}
221 			buf = newbuf;
222 			zb.outbuf = newbuf + totlen;
223 			zb.outlen = (nbuf * zbsize) - totlen;
224 		}
225 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
226 
227 	err = got_object_parse_header(obj, buf, totlen);
228 done:
229 	free(buf);
230 	got_inflate_end(&zb);
231 	return err;
232 }
233 
234 struct got_commit_object *
235 got_object_commit_alloc_partial(void)
236 {
237 	struct got_commit_object *commit;
238 
239 	commit = calloc(1, sizeof(*commit));
240 	if (commit == NULL)
241 		return NULL;
242 	commit->tree_id = malloc(sizeof(*commit->tree_id));
243 	if (commit->tree_id == NULL) {
244 		free(commit);
245 		return NULL;
246 	}
247 
248 	SIMPLEQ_INIT(&commit->parent_ids);
249 
250 	return commit;
251 }
252 
253 const struct got_error *
254 got_object_commit_add_parent(struct got_commit_object *commit,
255     const char *id_str)
256 {
257 	const struct got_error *err = NULL;
258 	struct got_object_qid *qid;
259 
260 	err = got_object_qid_alloc_partial(&qid);
261 	if (err)
262 		return err;
263 
264 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
265 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
266 		free(qid->id);
267 		free(qid);
268 		return err;
269 	}
270 
271 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
272 	commit->nparents++;
273 
274 	return NULL;
275 }
276 
277 static const struct got_error *
278 parse_gmtoff(time_t *gmtoff, const char *tzstr)
279 {
280 	int sign = 1;
281 	const char *p = tzstr;
282 	time_t h, m;
283 
284 	*gmtoff = 0;
285 
286 	if (*p == '-')
287 		sign = -1;
288 	else if (*p != '+')
289 		return got_error(GOT_ERR_BAD_OBJ_DATA);
290 	p++;
291 	if (!isdigit(*p) && !isdigit(*(p + 1)))
292 		return got_error(GOT_ERR_BAD_OBJ_DATA);
293 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
294 
295 	p += 2;
296 	if (!isdigit(*p) && !isdigit(*(p + 1)))
297 		return got_error(GOT_ERR_BAD_OBJ_DATA);
298 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
299 
300 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
301 	return NULL;
302 }
303 
304 static const struct got_error *
305 parse_commit_time(time_t *time, time_t *gmtoff, char *committer)
306 {
307 	const struct got_error *err = NULL;
308 	const char *errstr;
309 	char *space, *tzstr;
310 
311 	/* Parse and strip off trailing timezone indicator string. */
312 	space = strrchr(committer, ' ');
313 	if (space == NULL)
314 		return got_error(GOT_ERR_BAD_OBJ_DATA);
315 	tzstr = strdup(space + 1);
316 	if (tzstr == NULL)
317 		return got_error_from_errno("strdup");
318 	err = parse_gmtoff(gmtoff, tzstr);
319 	free(tzstr);
320 	if (err)
321 		return err;
322 	*space = '\0';
323 
324 	/* Timestamp is separated from committer name + email by space. */
325 	space = strrchr(committer, ' ');
326 	if (space == NULL)
327 		return got_error(GOT_ERR_BAD_OBJ_DATA);
328 
329 	/* Timestamp parsed here is expressed in comitter's local time. */
330 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
331 	if (errstr)
332 		return got_error(GOT_ERR_BAD_OBJ_DATA);
333 
334 	/* Express the time stamp in UTC. */
335 	*time -= *gmtoff;
336 
337 	/* Strip off parsed time information, leaving just author and email. */
338 	*space = '\0';
339 
340 	return NULL;
341 }
342 
343 void
344 got_object_commit_close(struct got_commit_object *commit)
345 {
346 	struct got_object_qid *qid;
347 
348 	if (commit->refcnt > 0) {
349 		commit->refcnt--;
350 		if (commit->refcnt > 0)
351 			return;
352 	}
353 
354 	while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
355 		qid = SIMPLEQ_FIRST(&commit->parent_ids);
356 		SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
357 		got_object_qid_free(qid);
358 	}
359 
360 	free(commit->tree_id);
361 	free(commit->author);
362 	free(commit->committer);
363 	free(commit->logmsg);
364 	free(commit);
365 }
366 
367 struct got_object_id *
368 got_object_commit_get_tree_id(struct got_commit_object *commit)
369 {
370 	return commit->tree_id;
371 }
372 
373 int
374 got_object_commit_get_nparents(struct got_commit_object *commit)
375 {
376 	return commit->nparents;
377 }
378 
379 const struct got_object_id_queue *
380 got_object_commit_get_parent_ids(struct got_commit_object *commit)
381 {
382 	return &commit->parent_ids;
383 }
384 
385 const char *
386 got_object_commit_get_author(struct got_commit_object *commit)
387 {
388 	return commit->author;
389 }
390 
391 time_t
392 got_object_commit_get_author_time(struct got_commit_object *commit)
393 {
394 	return commit->author_time;
395 }
396 
397 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
398 {
399 	return commit->author_gmtoff;
400 }
401 
402 const char *
403 got_object_commit_get_committer(struct got_commit_object *commit)
404 {
405 	return commit->committer;
406 }
407 
408 time_t
409 got_object_commit_get_committer_time(struct got_commit_object *commit)
410 {
411 	return commit->committer_time;
412 }
413 
414 time_t
415 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
416 {
417 	return commit->committer_gmtoff;
418 }
419 
420 const char *
421 got_object_commit_get_logmsg(struct got_commit_object *commit)
422 {
423 	return commit->logmsg;
424 }
425 
426 const struct got_error *
427 got_object_parse_commit(struct got_commit_object **commit, char *buf,
428     size_t len)
429 {
430 	const struct got_error *err = NULL;
431 	char *s = buf;
432 	size_t label_len;
433 	ssize_t remain = (ssize_t)len;
434 
435 	*commit = got_object_commit_alloc_partial();
436 	if (*commit == NULL)
437 		return got_error_from_errno("got_object_commit_alloc_partial");
438 
439 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
440 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
441 		remain -= label_len;
442 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
443 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
444 			goto done;
445 		}
446 		s += label_len;
447 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
448 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
449 			goto done;
450 		}
451 		remain -= SHA1_DIGEST_STRING_LENGTH;
452 		s += SHA1_DIGEST_STRING_LENGTH;
453 	} else {
454 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
455 		goto done;
456 	}
457 
458 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
459 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
460 		remain -= label_len;
461 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
462 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
463 			goto done;
464 		}
465 		s += label_len;
466 		err = got_object_commit_add_parent(*commit, s);
467 		if (err)
468 			goto done;
469 
470 		remain -= SHA1_DIGEST_STRING_LENGTH;
471 		s += SHA1_DIGEST_STRING_LENGTH;
472 	}
473 
474 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
475 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
476 		char *p;
477 		size_t slen;
478 
479 		remain -= label_len;
480 		if (remain <= 0) {
481 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
482 			goto done;
483 		}
484 		s += label_len;
485 		p = memchr(s, '\n', remain);
486 		if (p == NULL) {
487 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
488 			goto done;
489 		}
490 		*p = '\0';
491 		slen = strlen(s);
492 		err = parse_commit_time(&(*commit)->author_time,
493 		    &(*commit)->author_gmtoff, s);
494 		if (err)
495 			goto done;
496 		(*commit)->author = strdup(s);
497 		if ((*commit)->author == NULL) {
498 			err = got_error_from_errno("strdup");
499 			goto done;
500 		}
501 		s += slen + 1;
502 		remain -= slen + 1;
503 	}
504 
505 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
506 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
507 		char *p;
508 		size_t slen;
509 
510 		remain -= label_len;
511 		if (remain <= 0) {
512 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
513 			goto done;
514 		}
515 		s += label_len;
516 		p = memchr(s, '\n', remain);
517 		if (p == NULL) {
518 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
519 			goto done;
520 		}
521 		*p = '\0';
522 		slen = strlen(s);
523 		err = parse_commit_time(&(*commit)->committer_time,
524 		    &(*commit)->committer_gmtoff, s);
525 		if (err)
526 			goto done;
527 		(*commit)->committer = strdup(s);
528 		if ((*commit)->committer == NULL) {
529 			err = got_error_from_errno("strdup");
530 			goto done;
531 		}
532 		s += slen + 1;
533 		remain -= slen + 1;
534 	}
535 
536 	(*commit)->logmsg = strndup(s, remain);
537 	if ((*commit)->logmsg == NULL) {
538 		err = got_error_from_errno("strndup");
539 		goto done;
540 	}
541 done:
542 	if (err) {
543 		got_object_commit_close(*commit);
544 		*commit = NULL;
545 	}
546 	return err;
547 }
548 
549 void
550 got_object_tree_entry_close(struct got_tree_entry *te)
551 {
552 	free(te->id);
553 	free(te->name);
554 	free(te);
555 }
556 
557 void
558 got_object_tree_entries_close(struct got_tree_entries *entries)
559 {
560 	struct got_tree_entry *te;
561 
562 	while (!SIMPLEQ_EMPTY(&entries->head)) {
563 		te = SIMPLEQ_FIRST(&entries->head);
564 		SIMPLEQ_REMOVE_HEAD(&entries->head, entry);
565 		got_object_tree_entry_close(te);
566 	}
567 }
568 
569 void
570 got_object_tree_close(struct got_tree_object *tree)
571 {
572 	if (tree->refcnt > 0) {
573 		tree->refcnt--;
574 		if (tree->refcnt > 0)
575 			return;
576 	}
577 
578 	got_object_tree_entries_close(&tree->entries);
579 	free(tree);
580 }
581 
582 struct got_tree_entry *
583 got_alloc_tree_entry_partial(void)
584 {
585 	struct got_tree_entry *te;
586 
587 	te = malloc(sizeof(*te));
588 	if (te == NULL)
589 		return NULL;
590 
591 	te->id = malloc(sizeof(*te->id));
592 	if (te->id == NULL) {
593 		free(te);
594 		te = NULL;
595 	}
596 	return te;
597 }
598 
599 static const struct got_error *
600 parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
601     size_t maxlen)
602 {
603 	char *p, *space;
604 	const struct got_error *err = NULL;
605 
606 	*te = got_alloc_tree_entry_partial();
607 	if (*te == NULL)
608 		return got_error_from_errno("got_alloc_tree_entry_partial");
609 
610 	*elen = strnlen(buf, maxlen) + 1;
611 	if (*elen > maxlen) {
612 		free(*te);
613 		*te = NULL;
614 		return got_error(GOT_ERR_BAD_OBJ_DATA);
615 	}
616 
617 	space = memchr(buf, ' ', *elen);
618 	if (space == NULL || space <= buf) {
619 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
620 		free(*te);
621 		*te = NULL;
622 		return err;
623 	}
624 	(*te)->mode = 0;
625 	p = buf;
626 	while (p < space) {
627 		if (*p < '0' && *p > '7') {
628 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
629 			goto done;
630 		}
631 		(*te)->mode <<= 3;
632 		(*te)->mode |= *p - '0';
633 		p++;
634 	}
635 
636 	(*te)->name = strdup(space + 1);
637 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
638 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
639 		goto done;
640 	}
641 	buf += *elen;
642 	memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
643 	*elen += SHA1_DIGEST_LENGTH;
644 done:
645 	if (err) {
646 		got_object_tree_entry_close(*te);
647 		*te = NULL;
648 	}
649 	return err;
650 }
651 
652 const struct got_error *
653 got_object_parse_tree(struct got_tree_object **tree, uint8_t *buf, size_t len)
654 {
655 	const struct got_error *err;
656 	size_t remain = len;
657 	struct got_pathlist_head pathlist;
658 	struct got_pathlist_entry *pe;
659 
660 	TAILQ_INIT(&pathlist);
661 
662 	*tree = calloc(1, sizeof(**tree));
663 	if (*tree == NULL)
664 		return got_error_from_errno("calloc");
665 
666 	SIMPLEQ_INIT(&(*tree)->entries.head);
667 
668 	while (remain > 0) {
669 		struct got_tree_entry *te;
670 		struct got_pathlist_entry *new = NULL;
671 		size_t elen;
672 
673 		err = parse_tree_entry(&te, &elen, buf, remain);
674 		if (err)
675 			goto done;
676 		err = got_pathlist_insert(&new, &pathlist, te->name, te);
677 		if (err)
678 			goto done;
679 		if (new == NULL) {
680 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
681 			goto done;
682 		}
683 		buf += elen;
684 		remain -= elen;
685 	}
686 
687 	if (remain != 0) {
688 		got_object_tree_close(*tree);
689 		*tree = NULL;
690 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
691 		goto done;
692 	}
693 
694 	TAILQ_FOREACH(pe, &pathlist, entry) {
695 		struct got_tree_entry *te = pe->data;
696 		(*tree)->entries.nentries++;
697 		SIMPLEQ_INSERT_TAIL(&(*tree)->entries.head, te, entry);
698 	}
699 done:
700 	got_pathlist_free(&pathlist);
701 	return err;
702 }
703 
704 void
705 got_object_tag_close(struct got_tag_object *tag)
706 {
707 	free(tag->tag);
708 	free(tag->tagger);
709 	free(tag->tagmsg);
710 	free(tag);
711 }
712 
713 const struct got_error *
714 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
715 {
716 	const struct got_error *err = NULL;
717 	size_t remain = len;
718 	char *s = buf;
719 	size_t label_len;
720 
721 	*tag = calloc(1, sizeof(**tag));
722 	if (*tag == NULL)
723 		return got_error_from_errno("calloc");
724 
725 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
726 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
727 		remain -= label_len;
728 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
729 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
730 			goto done;
731 		}
732 		s += label_len;
733 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
734 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
735 			goto done;
736 		}
737 		remain -= SHA1_DIGEST_STRING_LENGTH;
738 		s += SHA1_DIGEST_STRING_LENGTH;
739 	} else {
740 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
741 		goto done;
742 	}
743 
744 	if (remain <= 0) {
745 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
746 		goto done;
747 	}
748 
749 	label_len = strlen(GOT_TAG_LABEL_TYPE);
750 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
751 		remain -= label_len;
752 		if (remain <= 0) {
753 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
754 			goto done;
755 		}
756 		s += label_len;
757 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
758 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
759 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
760 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
761 			s += label_len;
762 			remain -= label_len;
763 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
764 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
765 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
766 			label_len = strlen(GOT_OBJ_LABEL_TREE);
767 			s += label_len;
768 			remain -= label_len;
769 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
770 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
771 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
772 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
773 			s += label_len;
774 			remain -= label_len;
775 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
776 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
777 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
778 			label_len = strlen(GOT_OBJ_LABEL_TAG);
779 			s += label_len;
780 			remain -= label_len;
781 		} else {
782 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
783 			goto done;
784 		}
785 
786 		if (remain <= 0 || *s != '\n') {
787 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
788 			goto done;
789 		}
790 		s++;
791 		remain--;
792 		if (remain <= 0) {
793 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
794 			goto done;
795 		}
796 	} else {
797 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
798 		goto done;
799 	}
800 
801 	label_len = strlen(GOT_TAG_LABEL_TAG);
802 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
803 		char *p;
804 		size_t slen;
805 		remain -= label_len;
806 		if (remain <= 0) {
807 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
808 			goto done;
809 		}
810 		s += label_len;
811 		p = memchr(s, '\n', remain);
812 		if (p == NULL) {
813 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
814 			goto done;
815 		}
816 		*p = '\0';
817 		slen = strlen(s);
818 		(*tag)->tag = strndup(s, slen);
819 		if ((*tag)->tag == NULL) {
820 			err = got_error_from_errno("strndup");
821 			goto done;
822 		}
823 		s += slen + 1;
824 		remain -= slen + 1;
825 		if (remain <= 0) {
826 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
827 			goto done;
828 		}
829 	} else {
830 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
831 		goto done;
832 	}
833 
834 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
835 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
836 		char *p;
837 		size_t slen;
838 
839 		remain -= label_len;
840 		if (remain <= 0) {
841 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
842 			goto done;
843 		}
844 		s += label_len;
845 		p = memchr(s, '\n', remain);
846 		if (p == NULL) {
847 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
848 			goto done;
849 		}
850 		*p = '\0';
851 		slen = strlen(s);
852 		err = parse_commit_time(&(*tag)->tagger_time,
853 		    &(*tag)->tagger_gmtoff, s);
854 		if (err)
855 			goto done;
856 		(*tag)->tagger = strdup(s);
857 		if ((*tag)->tagger == NULL) {
858 			err = got_error_from_errno("strdup");
859 			goto done;
860 		}
861 		s += slen + 1;
862 		remain -= slen + 1;
863 		if (remain <= 0) {
864 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
865 			goto done;
866 		}
867 	} else {
868 		/* Some old tags in the Linux git repo have no tagger. */
869 		(*tag)->tagger = strdup("");
870 		if ((*tag)->tagger == NULL) {
871 			err = got_error_from_errno("strdup");
872 			goto done;
873 		}
874 	}
875 
876 	(*tag)->tagmsg = strndup(s, remain);
877 	if ((*tag)->tagmsg == NULL) {
878 		err = got_error_from_errno("strndup");
879 		goto done;
880 	}
881 done:
882 	if (err) {
883 		got_object_tag_close(*tag);
884 		*tag = NULL;
885 	}
886 	return err;
887 }
888 
889 const struct got_error *
890 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
891 {
892 	const struct got_error *err = NULL;
893 	static const size_t blocksize = 512;
894 	size_t n, total, remain;
895 	uint8_t *buf;
896 
897 	*outbuf = NULL;
898 	*outlen = 0;
899 
900 	buf = malloc(blocksize);
901 	if (buf == NULL)
902 		return got_error_from_errno("malloc");
903 
904 	remain = blocksize;
905 	total = 0;
906 	for (;;) {
907 		if (remain == 0) {
908 			uint8_t *newbuf;
909 			newbuf = reallocarray(buf, 1, total + blocksize);
910 			if (newbuf == NULL) {
911 				err = got_error_from_errno("reallocarray");
912 				goto done;
913 			}
914 			buf = newbuf;
915 			remain += blocksize;
916 		}
917 		n = fread(buf + total, 1, remain, f);
918 		if (n == 0) {
919 			if (ferror(f)) {
920 				err = got_ferror(f, GOT_ERR_IO);
921 				goto done;
922 			}
923 			break; /* EOF */
924 		}
925 		remain -= n;
926 		total += n;
927 	};
928 
929 done:
930 	if (err == NULL) {
931 		*outbuf = buf;
932 		*outlen = total;
933 	} else
934 		free(buf);
935 	return err;
936 }