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Date:: Thu Nov 26 12:54:19 2020 UTC
Message:: use size_t for loop indices to avoid signedness warnings; from emaste@freebsd
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1 /*
2  * Copyright (c) 2018, 2019, 2020 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/wait.h>
23 
24 #include <errno.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <stdint.h>
29 #include <sha1.h>
30 #include <zlib.h>
31 #include <ctype.h>
32 #include <limits.h>
33 #include <imsg.h>
34 #include <time.h>
35 #include <unistd.h>
36 
37 #include "got_error.h"
38 #include "got_object.h"
39 #include "got_repository.h"
40 #include "got_opentemp.h"
41 #include "got_path.h"
42 
43 #include "got_lib_sha1.h"
44 #include "got_lib_delta.h"
45 #include "got_lib_inflate.h"
46 #include "got_lib_object.h"
47 #include "got_lib_object_parse.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 struct got_object_id *
58 got_object_id_dup(struct got_object_id *id1)
59 {
60 	struct got_object_id *id2;
61 
62 	id2 = malloc(sizeof(*id2));
63 	if (id2 == NULL)
64 		return NULL;
65 	memcpy(id2, id1, sizeof(*id2));
66 	return id2;
67 }
68 
69 int
70 got_object_id_cmp(const struct got_object_id *id1,
71     const struct got_object_id *id2)
72 {
73 	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
74 }
75 
76 const struct got_error *
77 got_object_qid_alloc_partial(struct got_object_qid **qid)
78 {
79 	const struct got_error *err = NULL;
80 
81 	*qid = malloc(sizeof(**qid));
82 	if (*qid == NULL)
83 		return got_error_from_errno("malloc");
84 
85 	(*qid)->id = malloc(sizeof(*((*qid)->id)));
86 	if ((*qid)->id == NULL) {
87 		err = got_error_from_errno("malloc");
88 		got_object_qid_free(*qid);
89 		*qid = NULL;
90 		return err;
91 	}
92 
93 	return NULL;
94 }
95 
96 const struct got_error *
97 got_object_id_str(char **outbuf, struct got_object_id *id)
98 {
99 	static const size_t len = SHA1_DIGEST_STRING_LENGTH;
100 
101 	*outbuf = malloc(len);
102 	if (*outbuf == NULL)
103 		return got_error_from_errno("malloc");
104 
105 	if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
106 		free(*outbuf);
107 		*outbuf = NULL;
108 		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
109 	}
110 
111 	return NULL;
112 }
113 
114 void
115 got_object_close(struct got_object *obj)
116 {
117 	if (obj->refcnt > 0) {
118 		obj->refcnt--;
119 		if (obj->refcnt > 0)
120 			return;
121 	}
122 
123 	if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
124 		struct got_delta *delta;
125 		while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
126 			delta = SIMPLEQ_FIRST(&obj->deltas.entries);
127 			SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
128 			free(delta);
129 		}
130 	}
131 	free(obj);
132 }
133 
134 void
135 got_object_qid_free(struct got_object_qid *qid)
136 {
137 	free(qid->id);
138 	free(qid);
139 }
140 
141 void
142 got_object_id_queue_free(struct got_object_id_queue *ids)
143 {
144 	struct got_object_qid *qid;
145 
146 	while (!SIMPLEQ_EMPTY(ids)) {
147 		qid = SIMPLEQ_FIRST(ids);
148 		SIMPLEQ_REMOVE_HEAD(ids, entry);
149 		got_object_qid_free(qid);
150 	}
151 }
152 
153 const struct got_error *
154 got_object_parse_header(struct got_object **obj, char *buf, size_t len)
155 {
156 	const char *obj_labels[] = {
157 		GOT_OBJ_LABEL_COMMIT,
158 		GOT_OBJ_LABEL_TREE,
159 		GOT_OBJ_LABEL_BLOB,
160 		GOT_OBJ_LABEL_TAG,
161 	};
162 	const int obj_types[] = {
163 		GOT_OBJ_TYPE_COMMIT,
164 		GOT_OBJ_TYPE_TREE,
165 		GOT_OBJ_TYPE_BLOB,
166 		GOT_OBJ_TYPE_TAG,
167 	};
168 	int type = 0;
169 	size_t size = 0, hdrlen = 0;
170 	size_t i;
171 
172 	*obj = NULL;
173 
174 	hdrlen = strnlen(buf, len) + 1 /* '\0' */;
175 	if (hdrlen > len)
176 		return got_error(GOT_ERR_BAD_OBJ_HDR);
177 
178 	for (i = 0; i < nitems(obj_labels); i++) {
179 		const char *label = obj_labels[i];
180 		size_t label_len = strlen(label);
181 		const char *errstr;
182 
183 		if (strncmp(buf, label, label_len) != 0)
184 			continue;
185 
186 		type = obj_types[i];
187 		if (len <= label_len)
188 			return got_error(GOT_ERR_BAD_OBJ_HDR);
189 		size = strtonum(buf + label_len, 0, LONG_MAX, &errstr);
190 		if (errstr != NULL)
191 			return got_error(GOT_ERR_BAD_OBJ_HDR);
192 		break;
193 	}
194 
195 	if (type == 0)
196 		return got_error(GOT_ERR_BAD_OBJ_HDR);
197 
198 	*obj = calloc(1, sizeof(**obj));
199 	if (*obj == NULL)
200 		return got_error_from_errno("calloc");
201 	(*obj)->type = type;
202 	(*obj)->hdrlen = hdrlen;
203 	(*obj)->size = size;
204 	return NULL;
205 }
206 
207 const struct got_error *
208 got_object_read_header(struct got_object **obj, int fd)
209 {
210 	const struct got_error *err;
211 	struct got_inflate_buf zb;
212 	char *buf;
213 	const size_t zbsize = 64;
214 	size_t outlen, totlen;
215 	int nbuf = 1;
216 
217 	*obj = NULL;
218 
219 	buf = malloc(zbsize);
220 	if (buf == NULL)
221 		return got_error_from_errno("malloc");
222 
223 	err = got_inflate_init(&zb, buf, zbsize, NULL);
224 	if (err)
225 		return err;
226 
227 	totlen = 0;
228 	do {
229 		err = got_inflate_read_fd(&zb, fd, &outlen, NULL);
230 		if (err)
231 			goto done;
232 		if (outlen == 0)
233 			break;
234 		totlen += outlen;
235 		if (memchr(zb.outbuf, '\0', outlen) == NULL) {
236 			char *newbuf;
237 			nbuf++;
238 			newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
239 			if (newbuf == NULL) {
240 				err = got_error_from_errno("recallocarray");
241 				goto done;
242 			}
243 			buf = newbuf;
244 			zb.outbuf = newbuf + totlen;
245 			zb.outlen = (nbuf * zbsize) - totlen;
246 		}
247 	} while (memchr(zb.outbuf, '\0', outlen) == NULL);
248 
249 	err = got_object_parse_header(obj, buf, totlen);
250 done:
251 	free(buf);
252 	got_inflate_end(&zb);
253 	return err;
254 }
255 
256 struct got_commit_object *
257 got_object_commit_alloc_partial(void)
258 {
259 	struct got_commit_object *commit;
260 
261 	commit = calloc(1, sizeof(*commit));
262 	if (commit == NULL)
263 		return NULL;
264 	commit->tree_id = malloc(sizeof(*commit->tree_id));
265 	if (commit->tree_id == NULL) {
266 		free(commit);
267 		return NULL;
268 	}
269 
270 	SIMPLEQ_INIT(&commit->parent_ids);
271 
272 	return commit;
273 }
274 
275 const struct got_error *
276 got_object_commit_add_parent(struct got_commit_object *commit,
277     const char *id_str)
278 {
279 	const struct got_error *err = NULL;
280 	struct got_object_qid *qid;
281 
282 	err = got_object_qid_alloc_partial(&qid);
283 	if (err)
284 		return err;
285 
286 	if (!got_parse_sha1_digest(qid->id->sha1, id_str)) {
287 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
288 		got_object_qid_free(qid);
289 		return err;
290 	}
291 
292 	SIMPLEQ_INSERT_TAIL(&commit->parent_ids, qid, entry);
293 	commit->nparents++;
294 
295 	return NULL;
296 }
297 
298 static const struct got_error *
299 parse_gmtoff(time_t *gmtoff, const char *tzstr)
300 {
301 	int sign = 1;
302 	const char *p = tzstr;
303 	time_t h, m;
304 
305 	*gmtoff = 0;
306 
307 	if (*p == '-')
308 		sign = -1;
309 	else if (*p != '+')
310 		return got_error(GOT_ERR_BAD_OBJ_DATA);
311 	p++;
312 	if (!isdigit(*p) && !isdigit(*(p + 1)))
313 		return got_error(GOT_ERR_BAD_OBJ_DATA);
314 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
315 
316 	p += 2;
317 	if (!isdigit(*p) && !isdigit(*(p + 1)))
318 		return got_error(GOT_ERR_BAD_OBJ_DATA);
319 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
320 
321 	*gmtoff = (h * 60 * 60 + m * 60) * sign;
322 	return NULL;
323 }
324 
325 static const struct got_error *
326 parse_commit_time(time_t *time, time_t *gmtoff, char *committer)
327 {
328 	const struct got_error *err = NULL;
329 	const char *errstr;
330 	char *space, *tzstr;
331 
332 	/* Parse and strip off trailing timezone indicator string. */
333 	space = strrchr(committer, ' ');
334 	if (space == NULL)
335 		return got_error(GOT_ERR_BAD_OBJ_DATA);
336 	tzstr = strdup(space + 1);
337 	if (tzstr == NULL)
338 		return got_error_from_errno("strdup");
339 	err = parse_gmtoff(gmtoff, tzstr);
340 	free(tzstr);
341 	if (err)
342 		return err;
343 	*space = '\0';
344 
345 	/* Timestamp is separated from committer name + email by space. */
346 	space = strrchr(committer, ' ');
347 	if (space == NULL)
348 		return got_error(GOT_ERR_BAD_OBJ_DATA);
349 
350 	/* Timestamp parsed here is expressed as UNIX timestamp (UTC). */
351 	*time = strtonum(space + 1, 0, INT64_MAX, &errstr);
352 	if (errstr)
353 		return got_error(GOT_ERR_BAD_OBJ_DATA);
354 
355 	/* Strip off parsed time information, leaving just author and email. */
356 	*space = '\0';
357 
358 	return NULL;
359 }
360 
361 void
362 got_object_commit_close(struct got_commit_object *commit)
363 {
364 	if (commit->refcnt > 0) {
365 		commit->refcnt--;
366 		if (commit->refcnt > 0)
367 			return;
368 	}
369 
370 	got_object_id_queue_free(&commit->parent_ids);
371 	free(commit->tree_id);
372 	free(commit->author);
373 	free(commit->committer);
374 	free(commit->logmsg);
375 	free(commit);
376 }
377 
378 struct got_object_id *
379 got_object_commit_get_tree_id(struct got_commit_object *commit)
380 {
381 	return commit->tree_id;
382 }
383 
384 int
385 got_object_commit_get_nparents(struct got_commit_object *commit)
386 {
387 	return commit->nparents;
388 }
389 
390 const struct got_object_id_queue *
391 got_object_commit_get_parent_ids(struct got_commit_object *commit)
392 {
393 	return &commit->parent_ids;
394 }
395 
396 const char *
397 got_object_commit_get_author(struct got_commit_object *commit)
398 {
399 	return commit->author;
400 }
401 
402 time_t
403 got_object_commit_get_author_time(struct got_commit_object *commit)
404 {
405 	return commit->author_time;
406 }
407 
408 time_t got_object_commit_get_author_gmtoff(struct got_commit_object *commit)
409 {
410 	return commit->author_gmtoff;
411 }
412 
413 const char *
414 got_object_commit_get_committer(struct got_commit_object *commit)
415 {
416 	return commit->committer;
417 }
418 
419 time_t
420 got_object_commit_get_committer_time(struct got_commit_object *commit)
421 {
422 	return commit->committer_time;
423 }
424 
425 time_t
426 got_object_commit_get_committer_gmtoff(struct got_commit_object *commit)
427 {
428 	return commit->committer_gmtoff;
429 }
430 
431 const struct got_error *
432 got_object_commit_get_logmsg(char **logmsg, struct got_commit_object *commit)
433 {
434 	const struct got_error *err = NULL;
435 	char *msg0, *msg, *line, *s;
436 	size_t len;
437 	int headers = 1;
438 
439 	*logmsg = NULL;
440 
441 	msg0 = strdup(commit->logmsg);
442 	if (msg0 == NULL)
443 		return got_error_from_errno("strdup");
444 
445 	/* Copy log message line by line to strip out unusual headers... */
446 	msg = msg0;
447 	do {
448 		if ((line = strsep(&msg, "\n")) == NULL)
449 			break;
450 
451 		if (headers == 1) {
452 			if (line[0] != '\0' &&
453 			    strncmp(line, GOT_COMMIT_LABEL_TREE,
454 			        strlen(GOT_COMMIT_LABEL_TREE)) != 0 &&
455 			    strncmp(line, GOT_COMMIT_LABEL_AUTHOR,
456 			        strlen(GOT_COMMIT_LABEL_AUTHOR)) != 0 &&
457 			    strncmp(line, GOT_COMMIT_LABEL_PARENT,
458 			        strlen(GOT_COMMIT_LABEL_PARENT)) != 0 &&
459 			    strncmp(line, GOT_COMMIT_LABEL_COMMITTER,
460 			        strlen(GOT_COMMIT_LABEL_COMMITTER)) != 0)
461 				continue;
462 
463 			if (line[0] == '\0')
464 				headers = 0;
465 		}
466 
467 		if (asprintf(&s, "%s%s\n",
468 		    *logmsg ? *logmsg : "", line) == -1) {
469 			err = got_error_from_errno("asprintf");
470 			goto done;
471 		}
472 		free(*logmsg);
473 		*logmsg = s;
474 
475 	} while (line);
476 
477 	if (*logmsg == NULL) {
478 		/* log message does not contain \n */
479 		*logmsg = strdup(commit->logmsg);
480 		if (*logmsg == NULL) {
481 			err = got_error_from_errno("strdup");
482 			goto done;
483 		}
484 	}
485 
486 	/* Trim redundant trailing whitespace. */
487 	len = strlen(*logmsg);
488 	while (len > 1 && isspace((unsigned char)(*logmsg)[len - 2]) &&
489 	    isspace((unsigned char)(*logmsg)[len - 1])) {
490 		(*logmsg)[len - 1] = '\0';
491 		len--;
492 	}
493 done:
494 	free(msg0);
495 	if (err) {
496 		free(*logmsg);
497 		*logmsg = NULL;
498 	}
499 	return err;
500 }
501 
502 const char *
503 got_object_commit_get_logmsg_raw(struct got_commit_object *commit)
504 {
505 	return commit->logmsg;
506 }
507 
508 const struct got_error *
509 got_object_parse_commit(struct got_commit_object **commit, char *buf,
510     size_t len)
511 {
512 	const struct got_error *err = NULL;
513 	char *s = buf;
514 	size_t label_len;
515 	ssize_t remain = (ssize_t)len;
516 
517 	if (remain == 0)
518 		return got_error(GOT_ERR_BAD_OBJ_DATA);
519 
520 	*commit = got_object_commit_alloc_partial();
521 	if (*commit == NULL)
522 		return got_error_from_errno("got_object_commit_alloc_partial");
523 
524 	label_len = strlen(GOT_COMMIT_LABEL_TREE);
525 	if (strncmp(s, GOT_COMMIT_LABEL_TREE, label_len) == 0) {
526 		remain -= label_len;
527 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
528 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
529 			goto done;
530 		}
531 		s += label_len;
532 		if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
533 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
534 			goto done;
535 		}
536 		remain -= SHA1_DIGEST_STRING_LENGTH;
537 		s += SHA1_DIGEST_STRING_LENGTH;
538 	} else {
539 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
540 		goto done;
541 	}
542 
543 	label_len = strlen(GOT_COMMIT_LABEL_PARENT);
544 	while (strncmp(s, GOT_COMMIT_LABEL_PARENT, label_len) == 0) {
545 		remain -= label_len;
546 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
547 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
548 			goto done;
549 		}
550 		s += label_len;
551 		err = got_object_commit_add_parent(*commit, s);
552 		if (err)
553 			goto done;
554 
555 		remain -= SHA1_DIGEST_STRING_LENGTH;
556 		s += SHA1_DIGEST_STRING_LENGTH;
557 	}
558 
559 	label_len = strlen(GOT_COMMIT_LABEL_AUTHOR);
560 	if (strncmp(s, GOT_COMMIT_LABEL_AUTHOR, label_len) == 0) {
561 		char *p;
562 		size_t slen;
563 
564 		remain -= label_len;
565 		if (remain <= 0) {
566 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
567 			goto done;
568 		}
569 		s += label_len;
570 		p = memchr(s, '\n', remain);
571 		if (p == NULL) {
572 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
573 			goto done;
574 		}
575 		*p = '\0';
576 		slen = strlen(s);
577 		err = parse_commit_time(&(*commit)->author_time,
578 		    &(*commit)->author_gmtoff, s);
579 		if (err)
580 			goto done;
581 		(*commit)->author = strdup(s);
582 		if ((*commit)->author == NULL) {
583 			err = got_error_from_errno("strdup");
584 			goto done;
585 		}
586 		s += slen + 1;
587 		remain -= slen + 1;
588 	}
589 
590 	label_len = strlen(GOT_COMMIT_LABEL_COMMITTER);
591 	if (strncmp(s, GOT_COMMIT_LABEL_COMMITTER, label_len) == 0) {
592 		char *p;
593 		size_t slen;
594 
595 		remain -= label_len;
596 		if (remain <= 0) {
597 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
598 			goto done;
599 		}
600 		s += label_len;
601 		p = memchr(s, '\n', remain);
602 		if (p == NULL) {
603 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
604 			goto done;
605 		}
606 		*p = '\0';
607 		slen = strlen(s);
608 		err = parse_commit_time(&(*commit)->committer_time,
609 		    &(*commit)->committer_gmtoff, s);
610 		if (err)
611 			goto done;
612 		(*commit)->committer = strdup(s);
613 		if ((*commit)->committer == NULL) {
614 			err = got_error_from_errno("strdup");
615 			goto done;
616 		}
617 		s += slen + 1;
618 		remain -= slen + 1;
619 	}
620 
621 	(*commit)->logmsg = strndup(s, remain);
622 	if ((*commit)->logmsg == NULL) {
623 		err = got_error_from_errno("strndup");
624 		goto done;
625 	}
626 done:
627 	if (err) {
628 		got_object_commit_close(*commit);
629 		*commit = NULL;
630 	}
631 	return err;
632 }
633 
634 void
635 got_object_tree_close(struct got_tree_object *tree)
636 {
637 	if (tree->refcnt > 0) {
638 		tree->refcnt--;
639 		if (tree->refcnt > 0)
640 			return;
641 	}
642 
643 	free(tree->entries);
644 	free(tree);
645 }
646 
647 static const struct got_error *
648 parse_tree_entry(struct got_parsed_tree_entry **pte, const char **name,
649     size_t *elen, char *buf,
650     size_t maxlen)
651 {
652 	char *p, *space;
653 	const struct got_error *err = NULL;
654 
655 	*name = NULL;
656 	*elen = 0;
657 
658 	*pte = malloc(sizeof(**pte));
659 	if (*pte == NULL)
660 		return got_error_from_errno("malloc");
661 
662 	*elen = strnlen(buf, maxlen) + 1;
663 	if (*elen > maxlen) {
664 		free(*pte);
665 		*pte = NULL;
666 		return got_error(GOT_ERR_BAD_OBJ_DATA);
667 	}
668 
669 	space = memchr(buf, ' ', *elen);
670 	if (space == NULL || space <= buf) {
671 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
672 		free(*pte);
673 		*pte = NULL;
674 		return err;
675 	}
676 	(*pte)->mode = 0;
677 	p = buf;
678 	while (p < space) {
679 		if (*p < '0' && *p > '7') {
680 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
681 			goto done;
682 		}
683 		(*pte)->mode <<= 3;
684 		(*pte)->mode |= *p - '0';
685 		p++;
686 	}
687 
688 	if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
689 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
690 		goto done;
691 	}
692 	*name = space + 1;
693 	buf += *elen;
694 	(*pte)->id = buf;
695 	*elen += SHA1_DIGEST_LENGTH;
696 done:
697 	if (err) {
698 		free(*pte);
699 		*pte = NULL;
700 	}
701 	return err;
702 }
703 
704 const struct got_error *
705 got_object_parse_tree(struct got_pathlist_head *entries, int *nentries,
706     uint8_t *buf, size_t len)
707 {
708 	const struct got_error *err = NULL;
709 	size_t remain = len;
710 
711 	*nentries = 0;
712 	if (remain == 0)
713 		return NULL; /* tree is empty */
714 
715 	while (remain > 0) {
716 		struct got_parsed_tree_entry *pte;
717 		struct got_pathlist_entry *new = NULL;
718 		const char *name;
719 		size_t elen;
720 
721 		err = parse_tree_entry(&pte, &name, &elen, buf, remain);
722 		if (err)
723 			goto done;
724 		err = got_pathlist_insert(&new, entries, name, pte);
725 		if (err)
726 			goto done;
727 		if (new == NULL) {
728 			err = got_error(GOT_ERR_TREE_DUP_ENTRY);
729 			goto done;
730 		}
731 		buf += elen;
732 		remain -= elen;
733 		(*nentries)++;
734 	}
735 
736 	if (remain != 0) {
737 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
738 		goto done;
739 	}
740 done:
741 	if (err) {
742 		got_object_parsed_tree_entries_free(entries);
743 		*nentries = 0;
744 	}
745 	return err;
746 }
747 
748 void
749 got_object_parsed_tree_entries_free(struct got_pathlist_head *entries)
750 {
751 	struct got_pathlist_entry *pe;
752 
753 	TAILQ_FOREACH(pe, entries, entry) {
754 		struct got_parsed_tree_entry *pte = pe->data;
755 		free(pte);
756 	}
757 	got_pathlist_free(entries);
758 }
759 
760 void
761 got_object_tag_close(struct got_tag_object *tag)
762 {
763 	if (tag->refcnt > 0) {
764 		tag->refcnt--;
765 		if (tag->refcnt > 0)
766 			return;
767 	}
768 
769 	free(tag->tag);
770 	free(tag->tagger);
771 	free(tag->tagmsg);
772 	free(tag);
773 }
774 
775 const struct got_error *
776 got_object_parse_tag(struct got_tag_object **tag, uint8_t *buf, size_t len)
777 {
778 	const struct got_error *err = NULL;
779 	size_t remain = len;
780 	char *s = buf;
781 	size_t label_len;
782 
783 	if (remain == 0)
784 		return got_error(GOT_ERR_BAD_OBJ_DATA);
785 
786 	*tag = calloc(1, sizeof(**tag));
787 	if (*tag == NULL)
788 		return got_error_from_errno("calloc");
789 
790 	label_len = strlen(GOT_TAG_LABEL_OBJECT);
791 	if (strncmp(s, GOT_TAG_LABEL_OBJECT, label_len) == 0) {
792 		remain -= label_len;
793 		if (remain < SHA1_DIGEST_STRING_LENGTH) {
794 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
795 			goto done;
796 		}
797 		s += label_len;
798 		if (!got_parse_sha1_digest((*tag)->id.sha1, s)) {
799 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
800 			goto done;
801 		}
802 		remain -= SHA1_DIGEST_STRING_LENGTH;
803 		s += SHA1_DIGEST_STRING_LENGTH;
804 	} else {
805 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
806 		goto done;
807 	}
808 
809 	if (remain <= 0) {
810 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
811 		goto done;
812 	}
813 
814 	label_len = strlen(GOT_TAG_LABEL_TYPE);
815 	if (strncmp(s, GOT_TAG_LABEL_TYPE, label_len) == 0) {
816 		remain -= label_len;
817 		if (remain <= 0) {
818 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
819 			goto done;
820 		}
821 		s += label_len;
822 		if (strncmp(s, GOT_OBJ_LABEL_COMMIT,
823 		    strlen(GOT_OBJ_LABEL_COMMIT)) == 0) {
824 			(*tag)->obj_type = GOT_OBJ_TYPE_COMMIT;
825 			label_len = strlen(GOT_OBJ_LABEL_COMMIT);
826 			s += label_len;
827 			remain -= label_len;
828 		} else if (strncmp(s, GOT_OBJ_LABEL_TREE,
829 		    strlen(GOT_OBJ_LABEL_TREE)) == 0) {
830 			(*tag)->obj_type = GOT_OBJ_TYPE_TREE;
831 			label_len = strlen(GOT_OBJ_LABEL_TREE);
832 			s += label_len;
833 			remain -= label_len;
834 		} else if (strncmp(s, GOT_OBJ_LABEL_BLOB,
835 		    strlen(GOT_OBJ_LABEL_BLOB)) == 0) {
836 			(*tag)->obj_type = GOT_OBJ_TYPE_BLOB;
837 			label_len = strlen(GOT_OBJ_LABEL_BLOB);
838 			s += label_len;
839 			remain -= label_len;
840 		} else if (strncmp(s, GOT_OBJ_LABEL_TAG,
841 		    strlen(GOT_OBJ_LABEL_TAG)) == 0) {
842 			(*tag)->obj_type = GOT_OBJ_TYPE_TAG;
843 			label_len = strlen(GOT_OBJ_LABEL_TAG);
844 			s += label_len;
845 			remain -= label_len;
846 		} else {
847 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
848 			goto done;
849 		}
850 
851 		if (remain <= 0 || *s != '\n') {
852 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
853 			goto done;
854 		}
855 		s++;
856 		remain--;
857 		if (remain <= 0) {
858 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
859 			goto done;
860 		}
861 	} else {
862 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
863 		goto done;
864 	}
865 
866 	label_len = strlen(GOT_TAG_LABEL_TAG);
867 	if (strncmp(s, GOT_TAG_LABEL_TAG, label_len) == 0) {
868 		char *p;
869 		size_t slen;
870 		remain -= label_len;
871 		if (remain <= 0) {
872 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
873 			goto done;
874 		}
875 		s += label_len;
876 		p = memchr(s, '\n', remain);
877 		if (p == NULL) {
878 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
879 			goto done;
880 		}
881 		*p = '\0';
882 		slen = strlen(s);
883 		(*tag)->tag = strndup(s, slen);
884 		if ((*tag)->tag == NULL) {
885 			err = got_error_from_errno("strndup");
886 			goto done;
887 		}
888 		s += slen + 1;
889 		remain -= slen + 1;
890 		if (remain <= 0) {
891 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
892 			goto done;
893 		}
894 	} else {
895 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
896 		goto done;
897 	}
898 
899 	label_len = strlen(GOT_TAG_LABEL_TAGGER);
900 	if (strncmp(s, GOT_TAG_LABEL_TAGGER, label_len) == 0) {
901 		char *p;
902 		size_t slen;
903 
904 		remain -= label_len;
905 		if (remain <= 0) {
906 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
907 			goto done;
908 		}
909 		s += label_len;
910 		p = memchr(s, '\n', remain);
911 		if (p == NULL) {
912 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
913 			goto done;
914 		}
915 		*p = '\0';
916 		slen = strlen(s);
917 		err = parse_commit_time(&(*tag)->tagger_time,
918 		    &(*tag)->tagger_gmtoff, s);
919 		if (err)
920 			goto done;
921 		(*tag)->tagger = strdup(s);
922 		if ((*tag)->tagger == NULL) {
923 			err = got_error_from_errno("strdup");
924 			goto done;
925 		}
926 		s += slen + 1;
927 		remain -= slen + 1;
928 		if (remain <= 0) {
929 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
930 			goto done;
931 		}
932 	} else {
933 		/* Some old tags in the Linux git repo have no tagger. */
934 		(*tag)->tagger = strdup("");
935 		if ((*tag)->tagger == NULL) {
936 			err = got_error_from_errno("strdup");
937 			goto done;
938 		}
939 	}
940 
941 	(*tag)->tagmsg = strndup(s, remain);
942 	if ((*tag)->tagmsg == NULL) {
943 		err = got_error_from_errno("strndup");
944 		goto done;
945 	}
946 done:
947 	if (err) {
948 		got_object_tag_close(*tag);
949 		*tag = NULL;
950 	}
951 	return err;
952 }
953 
954 const struct got_error *
955 got_read_file_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
956 {
957 	const struct got_error *err = NULL;
958 	static const size_t blocksize = 512;
959 	size_t n, total, remain;
960 	uint8_t *buf;
961 
962 	*outbuf = NULL;
963 	*outlen = 0;
964 
965 	buf = malloc(blocksize);
966 	if (buf == NULL)
967 		return got_error_from_errno("malloc");
968 
969 	remain = blocksize;
970 	total = 0;
971 	for (;;) {
972 		if (remain == 0) {
973 			uint8_t *newbuf;
974 			newbuf = reallocarray(buf, 1, total + blocksize);
975 			if (newbuf == NULL) {
976 				err = got_error_from_errno("reallocarray");
977 				goto done;
978 			}
979 			buf = newbuf;
980 			remain += blocksize;
981 		}
982 		n = fread(buf + total, 1, remain, f);
983 		if (n == 0) {
984 			if (ferror(f)) {
985 				err = got_ferror(f, GOT_ERR_IO);
986 				goto done;
987 			}
988 			break; /* EOF */
989 		}
990 		remain -= n;
991 		total += n;
992 	};
993 
994 done:
995 	if (err == NULL) {
996 		*outbuf = buf;
997 		*outlen = total;
998 	} else
999 		free(buf);
1000 	return err;
1001 }