1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
|
/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* cramfsck - check a cramfs file system
*
* Copyright (C) 2000-2002 Transmeta Corporation
* 2005 Adrian Bunk
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 1999/12/03: Linus Torvalds (cramfs tester and unarchive program)
* 2000/06/03: Daniel Quinlan (CRC and length checking program)
* 2000/06/04: Daniel Quinlan (merged programs, added options, support
* for special files, preserve permissions and
* ownership, cramfs superblock v2, bogus mode
* test, pathname length test, etc.)
* 2000/06/06: Daniel Quinlan (support for holes, pretty-printing,
* symlink size test)
* 2000/07/11: Daniel Quinlan (file length tests, start at offset 0 or 512,
* fsck-compatible exit codes)
* 2000/07/15: Daniel Quinlan (initial support for block devices)
* 2002/01/10: Daniel Quinlan (additional checks, test more return codes,
* use read if mmap fails, standardize messages)
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdint.h>
#include <unistd.h>
#include <dirent.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
/* We don't use our include/crc32.h, but crc32 from zlib!
*
* The zlib implementation performs pre/post-conditioning. The util-linux
* imlemenation requires post-conditioning (xor) in the applications.
*/
#include <zlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "c.h"
#include "cramfs.h"
#include "nls.h"
#include "blkdev.h"
#include "exitcodes.h"
#include "strutils.h"
#include "closestream.h"
#define XALLOC_EXIT_CODE FSCK_EX_ERROR
#include "xalloc.h"
static int fd; /* ROM image file descriptor */
static char *filename; /* ROM image filename */
static struct cramfs_super super; /* just find the cramfs superblock once */
static int cramfs_is_big_endian = 0; /* source is big endian */
static int opt_verbose = 0; /* 1 = verbose (-v), 2+ = very verbose (-vv) */
static int opt_extract = 0; /* extract cramfs (-x) */
static char *extract_dir = ""; /* optional extraction directory (-x) */
#define PAD_SIZE 512
static uid_t euid; /* effective UID */
/* (cramfs_super + start) <= start_dir < end_dir <= start_data <= end_data */
static unsigned long start_dir = ~0UL; /* start of first non-root inode */
static unsigned long end_dir = 0; /* end of the directory structure */
static unsigned long start_data = ~0UL; /* start of the data (256 MB = max) */
static unsigned long end_data = 0; /* end of the data */
/* Guarantee access to at least 2 * blksize at a time */
#define CRAMFS_ROMBUFFER_BITS 13
#define CRAMFS_ROMBUFFERSIZE (1 << CRAMFS_ROMBUFFER_BITS)
#define CRAMFS_ROMBUFFERMASK (CRAMFS_ROMBUFFERSIZE - 1)
/* Defaults, updated in main() according to block size */
static size_t rombufbits = CRAMFS_ROMBUFFER_BITS;
static size_t rombufsize = CRAMFS_ROMBUFFERSIZE;
static size_t rombufmask = CRAMFS_ROMBUFFERMASK;
static char *read_buffer;
static unsigned long read_buffer_block = ~0UL;
static z_stream stream;
/* Prototypes */
static void expand_fs(char *, struct cramfs_inode *);
static char *outbuffer;
static size_t blksize = 0;
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options] <file>\n"), program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("Check and repair a compressed ROM filesystem.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -a for compatibility only, ignored\n"), out);
fputs(_(" -v, --verbose be more verbose\n"), out);
fputs(_(" -y for compatibility only, ignored\n"), out);
fputs(_(" -b, --blocksize <size> use this blocksize, defaults to page size\n"), out);
fputs(_(" --extract[=<dir>] test uncompression, optionally extract into <dir>\n"), out);
fputs(USAGE_SEPARATOR, out);
fprintf(out, USAGE_HELP_OPTIONS(26));
fprintf(out, USAGE_MAN_TAIL("fsck.cramfs(8)"));
exit(FSCK_EX_OK);
}
static int get_superblock_endianness(uint32_t magic)
{
if (magic == CRAMFS_MAGIC) {
cramfs_is_big_endian = HOST_IS_BIG_ENDIAN;
return 0;
}
if (magic ==
u32_toggle_endianness(!HOST_IS_BIG_ENDIAN, CRAMFS_MAGIC)) {
cramfs_is_big_endian = !HOST_IS_BIG_ENDIAN;
return 0;
}
return -1;
}
static void test_super(int *start)
{
struct stat st;
unsigned long long length;
fd = open(filename, O_RDONLY);
if (fd < 0)
err(FSCK_EX_ERROR, _("cannot open %s"), filename);
/* find the physical size of the file or block device */
if (fstat(fd, &st) < 0)
err(FSCK_EX_ERROR, _("stat of %s failed"), filename);
if (S_ISBLK(st.st_mode)) {
if (blkdev_get_size(fd, &length))
err(FSCK_EX_ERROR,
_("ioctl failed: unable to determine device size: %s"),
filename);
} else if (S_ISREG(st.st_mode))
length = st.st_size;
else
errx(FSCK_EX_ERROR, _("not a block device or file: %s"), filename);
if (length < sizeof(struct cramfs_super))
errx(FSCK_EX_UNCORRECTED, _("file length too short"));
/* find superblock */
if (read(fd, &super, sizeof(super)) != sizeof(super))
err(FSCK_EX_ERROR, _("cannot read %s"), filename);
if (get_superblock_endianness(super.magic) != -1)
*start = 0;
else if (length >= (PAD_SIZE + sizeof(super))) {
if (lseek(fd, PAD_SIZE, SEEK_SET) == (off_t) -1)
err(FSCK_EX_ERROR, _("seek on %s failed"), filename);
if (read(fd, &super, sizeof(super)) != sizeof(super))
err(FSCK_EX_ERROR, _("cannot read %s"), filename);
if (get_superblock_endianness(super.magic) != -1)
*start = PAD_SIZE;
else
errx(FSCK_EX_UNCORRECTED, _("superblock magic not found"));
} else
errx(FSCK_EX_UNCORRECTED, _("superblock magic not found"));
if (opt_verbose)
printf(_("cramfs endianness is %s\n"),
cramfs_is_big_endian ? _("big") : _("little"));
super_toggle_endianness(cramfs_is_big_endian, &super);
if (super.flags & ~CRAMFS_SUPPORTED_FLAGS)
errx(FSCK_EX_ERROR, _("unsupported filesystem features"));
/* What are valid superblock sizes? */
if (super.size < *start + sizeof(struct cramfs_super))
errx(FSCK_EX_UNCORRECTED, _("superblock size (%d) too small"),
super.size);
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
if (super.fsid.files == 0)
errx(FSCK_EX_UNCORRECTED, _("zero file count"));
if (length < super.size)
errx(FSCK_EX_UNCORRECTED, _("file length too short"));
else if (length > super.size)
warnx(_("file extends past end of filesystem"));
} else
warnx(_("old cramfs format"));
}
static void test_crc(int start)
{
void *buf;
uint32_t crc;
if (!(super.flags & CRAMFS_FLAG_FSID_VERSION_2)) {
warnx(_("unable to test CRC: old cramfs format"));
return;
}
crc = crc32(0L, NULL, 0);
buf =
mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
if (buf == MAP_FAILED) {
buf =
mmap(NULL, super.size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (buf != MAP_FAILED) {
ssize_t tmp;
if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
err(FSCK_EX_ERROR, _("seek on %s failed"), filename);
tmp = read(fd, buf, super.size);
if (tmp < 0)
err(FSCK_EX_ERROR, _("cannot read %s"), filename);
if (tmp != (ssize_t) super.size)
errx(FSCK_EX_ERROR, _("failed to read %"PRIu32" bytes from file %s"),
super.size, filename);
}
}
if (buf != MAP_FAILED) {
((struct cramfs_super *)((unsigned char *) buf + start))->fsid.crc =
crc32(0L, NULL, 0);
crc = crc32(crc, (unsigned char *) buf + start, super.size - start);
munmap(buf, super.size);
} else {
int retval;
size_t length = 0;
buf = xmalloc(4096);
if (lseek(fd, start, SEEK_SET) == (off_t) -1)
err(FSCK_EX_ERROR, _("seek on %s failed"), filename);
for (;;) {
retval = read(fd, buf, 4096);
if (retval < 0)
err(FSCK_EX_ERROR, _("cannot read %s"), filename);
else if (retval == 0)
break;
if (length == 0)
((struct cramfs_super *)buf)->fsid.crc =
crc32(0L, NULL, 0);
length += retval;
if (length > (super.size - start)) {
crc = crc32(crc, buf,
retval - (length -
(super.size - start)));
break;
}
crc = crc32(crc, buf, retval);
}
free(buf);
}
if (crc != super.fsid.crc)
errx(FSCK_EX_UNCORRECTED, _("crc error"));
}
static void print_node(char type, struct cramfs_inode *i, char *name)
{
char info[10];
if (S_ISCHR(i->mode) || (S_ISBLK(i->mode)))
/* major/minor numbers can be as high as 2^12 or 4096 */
snprintf(info, 10, "%4d,%4d", major(i->size), minor(i->size));
else
/* size be as high as 2^24 or 16777216 */
snprintf(info, 10, "%9d", i->size);
printf("%c %04o %s %5d:%-3d %s\n",
type, i->mode & ~S_IFMT, info, i->uid, i->gid,
!*name && type == 'd' ? "/" : name);
}
/*
* Create a fake "blocked" access
*/
static void *romfs_read(unsigned long offset)
{
unsigned int block = offset >> rombufbits;
if (block != read_buffer_block) {
ssize_t x;
read_buffer_block = block;
if (lseek(fd, block << rombufbits, SEEK_SET) == (off_t) -1)
warn(_("seek failed"));
x = read(fd, read_buffer, rombufsize * 2);
if (x < 0)
warn(_("read romfs failed"));
}
return read_buffer + (offset & rombufmask);
}
static struct cramfs_inode *cramfs_iget(struct cramfs_inode *i)
{
struct cramfs_inode *inode = xmalloc(sizeof(struct cramfs_inode));
inode_to_host(cramfs_is_big_endian, i, inode);
return inode;
}
static struct cramfs_inode *iget(unsigned int ino)
{
return cramfs_iget(romfs_read(ino));
}
static void iput(struct cramfs_inode *inode)
{
free(inode);
}
/*
* Return the offset of the root directory
*/
static struct cramfs_inode *read_super(void)
{
struct cramfs_inode *root = cramfs_iget(&super.root);
unsigned long offset = root->offset << 2;
if (!S_ISDIR(root->mode))
errx(FSCK_EX_UNCORRECTED, _("root inode is not directory"));
if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
((offset != sizeof(struct cramfs_super)) &&
(offset != PAD_SIZE + sizeof(struct cramfs_super)))) {
errx(FSCK_EX_UNCORRECTED, _("bad root offset (%lu)"), offset);
}
return root;
}
static int uncompress_block(void *src, size_t len)
{
int err;
stream.next_in = src;
stream.avail_in = len;
stream.next_out = (unsigned char *)outbuffer;
stream.avail_out = blksize * 2;
inflateReset(&stream);
if (len > blksize * 2)
errx(FSCK_EX_UNCORRECTED, _("data block too large"));
err = inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
errx(FSCK_EX_UNCORRECTED, _("decompression error: %s"),
zError(err));
return stream.total_out;
}
#ifndef HAVE_LCHOWN
#define lchown chown
#endif
static void do_uncompress(char *path, int outfd, unsigned long offset,
unsigned long size)
{
unsigned long curr = offset + 4 * ((size + blksize - 1) / blksize);
do {
unsigned long out = blksize;
unsigned long next = u32_toggle_endianness(cramfs_is_big_endian,
*(uint32_t *)
romfs_read(offset));
if (next > end_data)
end_data = next;
offset += 4;
if (curr == next) {
if (opt_verbose > 1)
printf(_(" hole at %lu (%zu)\n"), curr,
blksize);
if (size < blksize)
out = size;
memset(outbuffer, 0x00, out);
} else {
if (opt_verbose > 1)
printf(_(" uncompressing block at %lu to %lu (%lu)\n"),
curr, next, next - curr);
out = uncompress_block(romfs_read(curr), next - curr);
}
if (size >= blksize) {
if (out != blksize)
errx(FSCK_EX_UNCORRECTED,
_("non-block (%ld) bytes"), out);
} else {
if (out != size)
errx(FSCK_EX_UNCORRECTED,
_("non-size (%ld vs %ld) bytes"), out,
size);
}
size -= out;
if (*extract_dir != '\0' && write(outfd, outbuffer, out) < 0)
err(FSCK_EX_ERROR, _("write failed: %s"), path);
curr = next;
} while (size);
}
static void change_file_status(char *path, struct cramfs_inode *i)
{
const struct timeval epoch[] = { {0,0}, {0,0} };
if (euid == 0) {
if (lchown(path, i->uid, i->gid) < 0)
err(FSCK_EX_ERROR, _("lchown failed: %s"), path);
if (S_ISLNK(i->mode))
return;
if (((S_ISUID | S_ISGID) & i->mode) && chmod(path, i->mode) < 0)
err(FSCK_EX_ERROR, _("chmod failed: %s"), path);
}
if (S_ISLNK(i->mode))
return;
if (utimes(path, epoch) < 0)
err(FSCK_EX_ERROR, _("utimes failed: %s"), path);
}
static int is_dangerous_filename(char *name, int len)
{
return (len == 1 && name[0] == '.') ||
(len == 2 && name[0] == '.' && name[1] == '.');
}
static void __attribute__((__noreturn__))
errx_path(const char *mesg, const char *name, size_t namelen)
{
char buf[PATH_MAX] = { 0 };
namelen = min(namelen, sizeof(buf) - 1);
memcpy(buf, name, namelen);
errx(FSCK_EX_UNCORRECTED, "%s: %s", mesg, buf);
}
static void do_directory(char *path, struct cramfs_inode *i)
{
int pathlen = strlen(path);
int count = i->size;
unsigned long offset = i->offset << 2;
char *newpath = xmalloc(pathlen + 256);
if (offset == 0 && count != 0)
errx(FSCK_EX_UNCORRECTED,
_("directory inode has zero offset and non-zero size: %s"),
path);
if (offset != 0 && offset < start_dir)
start_dir = offset;
/* TODO: Do we need to check end_dir for empty case? */
memcpy(newpath, path, pathlen);
newpath[pathlen] = '/';
pathlen++;
if (opt_verbose)
print_node('d', i, path);
if (*extract_dir != '\0') {
if (mkdir(path, i->mode) < 0)
err(FSCK_EX_ERROR, _("mkdir failed: %s"), path);
change_file_status(path, i);
}
while (count > 0) {
struct cramfs_inode *child = iget(offset);
char *name;
int size;
int newlen = child->namelen << 2;
size = sizeof(struct cramfs_inode) + newlen;
count -= size;
offset += sizeof(struct cramfs_inode);
name = romfs_read(offset);
if (memchr(name, '/', newlen) != NULL)
errx_path(_("illegal filename"), name, newlen);
if (*extract_dir != '\0' && is_dangerous_filename(name, newlen))
errx_path(_("dangerous filename"), name, newlen);
memcpy(newpath + pathlen, name, newlen);
newpath[pathlen + newlen] = 0;
if (newlen == 0)
errx(FSCK_EX_UNCORRECTED, _("filename length is zero"));
if ((pathlen + newlen) - strlen(newpath) > 3)
errx(FSCK_EX_UNCORRECTED, _("bad filename length"));
expand_fs(newpath, child);
offset += newlen;
if (offset <= start_dir)
errx(FSCK_EX_UNCORRECTED, _("bad inode offset"));
if (offset > end_dir)
end_dir = offset;
iput(child); /* free(child) */
}
free(newpath);
}
static void do_file(char *path, struct cramfs_inode *i)
{
unsigned long offset = i->offset << 2;
int outfd = 0;
if (offset == 0 && i->size != 0)
errx(FSCK_EX_UNCORRECTED,
_("file inode has zero offset and non-zero size"));
if (i->size == 0 && offset != 0)
errx(FSCK_EX_UNCORRECTED,
_("file inode has zero size and non-zero offset"));
if (offset != 0 && offset < start_data)
start_data = offset;
if (opt_verbose)
print_node('f', i, path);
if (*extract_dir != '\0') {
outfd = open(path, O_WRONLY | O_CREAT | O_TRUNC, i->mode);
if (outfd < 0)
err(FSCK_EX_ERROR, _("cannot open %s"), path);
}
if (i->size)
do_uncompress(path, outfd, offset, i->size);
if ( *extract_dir != '\0') {
if (close_fd(outfd) != 0)
err(FSCK_EX_ERROR, _("write failed: %s"), path);
change_file_status(path, i);
}
}
static void do_symlink(char *path, struct cramfs_inode *i)
{
unsigned long offset = i->offset << 2;
unsigned long curr = offset + 4;
unsigned long next =
u32_toggle_endianness(cramfs_is_big_endian,
*(uint32_t *) romfs_read(offset));
unsigned long size;
if (offset == 0)
errx(FSCK_EX_UNCORRECTED, _("symbolic link has zero offset"));
if (i->size == 0)
errx(FSCK_EX_UNCORRECTED, _("symbolic link has zero size"));
if (offset < start_data)
start_data = offset;
if (next > end_data)
end_data = next;
size = uncompress_block(romfs_read(curr), next - curr);
if (size != i->size)
errx(FSCK_EX_UNCORRECTED, _("size error in symlink: %s"), path);
outbuffer[size] = 0;
if (opt_verbose) {
char *str;
xasprintf(&str, "%s -> %s", path, outbuffer);
print_node('l', i, str);
if (opt_verbose > 1)
printf(_(" uncompressing block at %lu to %lu (%lu)\n"),
curr, next, next - curr);
free(str);
}
if (*extract_dir != '\0') {
if (symlink(outbuffer, path) < 0)
err(FSCK_EX_ERROR, _("symlink failed: %s"), path);
change_file_status(path, i);
}
}
static void do_special_inode(char *path, struct cramfs_inode *i)
{
dev_t devtype = 0;
char type;
if (i->offset)
/* no need to shift offset */
errx(FSCK_EX_UNCORRECTED,
_("special file has non-zero offset: %s"), path);
if (S_ISCHR(i->mode)) {
devtype = i->size;
type = 'c';
} else if (S_ISBLK(i->mode)) {
devtype = i->size;
type = 'b';
} else if (S_ISFIFO(i->mode)) {
if (i->size != 0)
errx(FSCK_EX_UNCORRECTED, _("fifo has non-zero size: %s"),
path);
type = 'p';
} else if (S_ISSOCK(i->mode)) {
if (i->size != 0)
errx(FSCK_EX_UNCORRECTED,
_("socket has non-zero size: %s"), path);
type = 's';
} else {
errx(FSCK_EX_UNCORRECTED, _("bogus mode: %s (%o)"), path, i->mode);
return; /* not reached */
}
if (opt_verbose)
print_node(type, i, path);
if (*extract_dir != '\0') {
if (mknod(path, i->mode, devtype) < 0)
err(FSCK_EX_ERROR, _("mknod failed: %s"), path);
change_file_status(path, i);
}
}
static void expand_fs(char *path, struct cramfs_inode *inode)
{
if (S_ISDIR(inode->mode))
do_directory(path, inode);
else if (S_ISREG(inode->mode))
do_file(path, inode);
else if (S_ISLNK(inode->mode))
do_symlink(path, inode);
else
do_special_inode(path, inode);
}
static void test_fs(int start)
{
struct cramfs_inode *root;
root = read_super();
umask(0);
euid = geteuid();
stream.next_in = NULL;
stream.avail_in = 0;
inflateInit(&stream);
expand_fs(extract_dir, root);
inflateEnd(&stream);
if (start_data != ~0UL) {
if (start_data < (sizeof(struct cramfs_super) + start))
errx(FSCK_EX_UNCORRECTED,
_("directory data start (%lu) < sizeof(struct cramfs_super) + start (%zu)"),
start_data, sizeof(struct cramfs_super) + start);
if (end_dir != start_data)
errx(FSCK_EX_UNCORRECTED,
_("directory data end (%lu) != file data start (%lu)"),
end_dir, start_data);
}
if (super.flags & CRAMFS_FLAG_FSID_VERSION_2 && end_data > super.size)
errx(FSCK_EX_UNCORRECTED, _("invalid file data offset"));
iput(root); /* free(root) */
}
int main(int argc, char **argv)
{
int c; /* for getopt */
int start = 0;
static const struct option longopts[] = {
{"verbose", no_argument, NULL, 'v'},
{"version", no_argument, NULL, 'V'},
{"help", no_argument, NULL, 'h'},
{"blocksize", required_argument, NULL, 'b'},
{"extract", optional_argument, NULL, 'x'},
{NULL, 0, NULL, 0},
};
setlocale(LC_MESSAGES, "");
setlocale(LC_CTYPE, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
strutils_set_exitcode(FSCK_EX_USAGE);
/* command line options */
while ((c = getopt_long(argc, argv, "ayvVhb:", longopts, NULL)) != EOF)
switch (c) {
case 'a': /* ignore */
case 'y':
break;
case 'h':
usage();
break;
case 'V':
print_version(FSCK_EX_OK);
case 'x':
opt_extract = 1;
if(optarg)
extract_dir = optarg;
break;
case 'v':
opt_verbose++;
break;
case 'b':
blksize = strtou32_or_err(optarg, _("invalid blocksize argument"));
break;
default:
errtryhelp(FSCK_EX_USAGE);
}
if ((argc - optind) != 1){
warnx(_("bad usage"));
errtryhelp(FSCK_EX_USAGE);
}
filename = argv[optind];
test_super(&start);
test_crc(start);
if (opt_extract) {
size_t bufsize = 0;
if (blksize == 0)
blksize = getpagesize();
/* re-calculate according to blksize */
bufsize = rombufsize = blksize * 2;
rombufbits = 0;
while (bufsize >>= 1)
rombufbits++;
rombufmask = rombufsize - 1;
outbuffer = xmalloc(blksize * 2);
read_buffer = xmalloc(rombufsize * 2);
test_fs(start);
}
if (opt_verbose)
printf(_("%s: OK\n"), filename);
exit(FSCK_EX_OK);
}
|