2006-12-06 17:25:58 -06:00
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/*
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* cramfsck - check a cramfs file system
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*
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* Copyright (C) 2000-2001 Transmeta Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* 1999/12/03: Linus Torvalds (cramfs tester and unarchive program)
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* 2000/06/03: Daniel Quinlan (CRC and length checking program)
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* 2000/06/04: Daniel Quinlan (merged programs, added options, support
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* for special files, preserve permissions and
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* ownership, cramfs superblock v2, bogus mode
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* test, pathname length test, etc.)
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* 2000/06/06: Daniel Quinlan (support for holes, pretty-printing,
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* symlink size test)
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* 2000/07/11: Daniel Quinlan (file length tests, start at offset 0 or 512,
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* fsck-compatible exit codes)
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* 2000/07/15: Daniel Quinlan (initial support for block devices)
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*/
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/* compile-time options */
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#define INCLUDE_FS_TESTS /* include cramfs checking and extraction */
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#include <stdio.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <getopt.h>
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#include <utime.h>
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#include <fcntl.h>
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#include <zlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <sys/sysmacros.h> /* for major, minor */
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#include "cramfs.h"
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#include "../defines.h" /* for HAVE_lchown */
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#include "nls.h"
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#define BLKGETSIZE _IO(0x12,96) /* return device size */
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static const char *progname = "cramfsck";
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static int fd; /* ROM image file descriptor */
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static char *filename; /* ROM image filename */
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struct cramfs_super *super; /* just find the cramfs superblock once */
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static int opt_verbose = 0; /* 1 = verbose (-v), 2+ = very verbose (-vv) */
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#ifdef INCLUDE_FS_TESTS
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static int opt_extract = 0; /* extract cramfs (-x) */
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char *extract_dir = NULL; /* extraction directory (-x) */
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unsigned long start_inode = 1 << 28; /* start of first non-root inode */
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unsigned long end_inode = 0; /* end of the directory structure */
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unsigned long start_data = 1 << 28; /* start of the data (256 MB = max) */
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unsigned long end_data = 0; /* end of the data */
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/* true? cramfs_super < start_inode < end_inode <= start_data <= end_data */
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static uid_t euid; /* effective UID */
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#define PAD_SIZE 512
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2006-12-06 17:26:26 -06:00
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#include <asm/page.h>
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#ifdef PAGE_SIZE
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#define PAGE_CACHE_SIZE ((int) PAGE_SIZE)
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#elif defined __ia64__
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#define PAGE_CACHE_SIZE (16384)
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#elif defined __alpha__
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#define PAGE_CACHE_SIZE (8192)
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#else
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2006-12-06 17:25:58 -06:00
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#define PAGE_CACHE_SIZE (4096)
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2006-12-06 17:26:26 -06:00
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#endif
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2006-12-06 17:25:58 -06:00
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/* Guarantee access to at least 8kB at a time */
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#define ROMBUFFER_BITS 13
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#define ROMBUFFERSIZE (1 << ROMBUFFER_BITS)
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#define ROMBUFFERMASK (ROMBUFFERSIZE-1)
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static char read_buffer[ROMBUFFERSIZE * 2];
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static unsigned long read_buffer_block = ~0UL;
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/* Uncompressing data structures... */
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static char outbuffer[PAGE_CACHE_SIZE*2];
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z_stream stream;
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#endif /* INCLUDE_FS_TESTS */
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/* Input status of 0 to print help and exit without an error. */
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static void usage(int status)
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{
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FILE *stream = status ? stderr : stdout;
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fprintf(stream, _("usage: %s [-hv] [-x dir] file\n"
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" -h print this help\n"
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" -x dir extract into dir\n"
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" -v be more verbose\n"
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" file file to test\n"), progname);
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exit(status);
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}
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#ifdef INCLUDE_FS_TESTS
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static void print_node(char type, struct cramfs_inode *i, char *name)
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{
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char info[10];
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if (S_ISCHR(i->mode) || (S_ISBLK(i->mode))) {
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/* major/minor numbers can be as high as 2^12 or 4096 */
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snprintf(info, 10, "%4d,%4d", major(i->size), minor(i->size));
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}
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else {
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/* size be as high as 2^24 or 16777216 */
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snprintf(info, 10, "%9d", i->size);
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}
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printf("%c %04o %s %5d:%-3d %s\n",
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type, i->mode & ~S_IFMT, info, i->uid, i->gid, name);
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}
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/*
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* Create a fake "blocked" access
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*/
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static void *romfs_read(unsigned long offset)
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{
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unsigned int block = offset >> ROMBUFFER_BITS;
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if (block != read_buffer_block) {
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read_buffer_block = block;
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lseek(fd, block << ROMBUFFER_BITS, SEEK_SET);
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read(fd, read_buffer, ROMBUFFERSIZE * 2);
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}
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return read_buffer + (offset & ROMBUFFERMASK);
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}
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static struct cramfs_inode *cramfs_iget(struct cramfs_inode * i)
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{
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struct cramfs_inode *inode = malloc(sizeof(struct cramfs_inode));
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*inode = *i;
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return inode;
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}
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static struct cramfs_inode *iget(unsigned int ino)
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{
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return cramfs_iget(romfs_read(ino));
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}
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#if 0
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static void iput(struct cramfs_inode *inode)
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{
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free(inode);
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}
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#endif
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/*
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* Return the offset of the root directory,
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* or 0 if none.
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*/
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static struct cramfs_inode *read_super(void)
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{
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unsigned long offset;
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offset = super->root.offset << 2;
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if (super->magic != CRAMFS_MAGIC)
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return NULL;
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if (memcmp(super->signature, CRAMFS_SIGNATURE, sizeof(super->signature)) != 0)
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return NULL;
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if (offset < sizeof(super))
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return NULL;
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return cramfs_iget(&super->root);
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}
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static int uncompress_block(void *src, int len)
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{
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int err;
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stream.next_in = src;
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stream.avail_in = len;
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stream.next_out = (unsigned char *) outbuffer;
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stream.avail_out = PAGE_CACHE_SIZE*2;
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inflateReset(&stream);
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err = inflate(&stream, Z_FINISH);
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if (err != Z_STREAM_END) {
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fprintf(stderr,
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_("%s: error %d while decompressing! %p(%d)\n"),
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filename, err, src, len);
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exit(4);
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}
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return stream.total_out;
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}
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#ifdef HAVE_lchown
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#define my_lchown lchown
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#else
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#define my_lchown chown
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#endif
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static void change_file_status(char *path, struct cramfs_inode *i)
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{
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struct utimbuf epoch = { 0, 0 };
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if (euid == 0) {
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if (my_lchown(path, i->uid, i->gid) < 0) {
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perror(path);
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exit(8);
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}
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if (S_ISLNK(i->mode))
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return;
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if ((S_ISUID | S_ISGID) & i->mode) {
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if (chmod(path, i->mode) < 0) {
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perror(path);
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exit(8);
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}
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}
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}
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if (S_ISLNK(i->mode))
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return;
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if (utime(path, &epoch) < 0) {
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perror(path);
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exit(8);
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}
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}
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static void do_symlink(char *path, struct cramfs_inode *i)
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{
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unsigned long offset = i->offset << 2;
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unsigned long curr = offset + 4;
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unsigned long next = *(u32 *) romfs_read(offset);
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unsigned long size;
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if (next > end_data) {
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end_data = next;
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}
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size = uncompress_block(romfs_read(curr), next - curr);
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if (size != i->size) {
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fprintf(stderr, _("%s: size error in symlink `%s'\n"),
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filename, path);
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exit(4);
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}
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outbuffer[size] = 0;
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if (opt_verbose) {
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char *str;
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str = malloc(strlen(outbuffer) + strlen(path) + 5);
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strcpy(str, path);
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strncat(str, " -> ", 4);
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strncat(str, outbuffer, size);
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print_node('l', i, str);
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if (opt_verbose > 1) {
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printf(_(" uncompressing block at %ld "
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"to %ld (%ld)\n"),
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curr, next, next - curr);
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}
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}
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if (opt_extract) {
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symlink(outbuffer, path);
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change_file_status(path, i);
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}
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}
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static void do_special_inode(char *path, struct cramfs_inode *i)
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{
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dev_t devtype = 0;
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char type;
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if (S_ISCHR(i->mode)) {
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devtype = i->size;
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type = 'c';
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}
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else if (S_ISBLK(i->mode)) {
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devtype = i->size;
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type = 'b';
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}
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else if (S_ISFIFO(i->mode))
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type = 'p';
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else if (S_ISSOCK(i->mode))
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type = 's';
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else {
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fprintf(stderr, _("%s: bogus mode on `%s' (%o)\n"),
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filename, path, i->mode);
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exit(4);
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}
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if (opt_verbose) {
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print_node(type, i, path);
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}
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if (opt_extract) {
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if (mknod(path, i->mode, devtype) < 0) {
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perror(path);
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exit(8);
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}
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change_file_status(path, i);
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}
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}
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static void do_uncompress(int fd, unsigned long offset, unsigned long size)
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{
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unsigned long curr = offset + 4 * ((size + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE);
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do {
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unsigned long out = PAGE_CACHE_SIZE;
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unsigned long next = *(u32 *) romfs_read(offset);
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if (next > end_data)
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end_data = next;
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offset += 4;
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if (curr == next) {
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if (opt_verbose > 1) {
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printf(_(" hole at %ld (%d)\n"),
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curr, PAGE_CACHE_SIZE);
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}
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if (size < PAGE_CACHE_SIZE)
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out = size;
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memset(outbuffer, 0x00, out);
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}
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else {
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if (opt_verbose > 1) {
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printf(_(" uncompressing block at %ld "
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"to %ld (%ld)\n"),
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curr, next, next - curr);
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}
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out = uncompress_block(romfs_read(curr), next - curr);
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}
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if (size >= PAGE_CACHE_SIZE) {
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if (out != PAGE_CACHE_SIZE) {
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fprintf(stderr,
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_("%s: Non-block (%ld) bytes\n"),
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filename, out);
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exit(4);
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}
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} else {
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if (out != size) {
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fprintf(stderr, _("%s: Non-size (%ld vs %ld) "
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"bytes\n"),
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filename, out, size);
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exit(4);
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}
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}
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size -= out;
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if (opt_extract) {
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write(fd, outbuffer, out);
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}
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curr = next;
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} while (size);
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}
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static void expand_fs(int pathlen, char *path, struct cramfs_inode *inode)
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{
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if (S_ISDIR(inode->mode)) {
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int count = inode->size;
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unsigned long offset = inode->offset << 2;
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char *newpath = malloc(pathlen + 256);
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if (count > 0 && offset < start_inode) {
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start_inode = offset;
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}
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/* XXX - need to check end_inode for empty case? */
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memcpy(newpath, path, pathlen);
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newpath[pathlen] = '/';
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pathlen++;
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|
|
|
if (opt_verbose) {
|
|
|
|
print_node('d', inode, path);
|
|
|
|
}
|
|
|
|
if (opt_extract) {
|
|
|
|
mkdir(path, inode->mode);
|
|
|
|
change_file_status(path, inode);
|
|
|
|
}
|
|
|
|
while (count > 0) {
|
|
|
|
struct cramfs_inode *child = iget(offset);
|
|
|
|
int size;
|
|
|
|
int newlen = child->namelen << 2;
|
|
|
|
|
|
|
|
size = sizeof(struct cramfs_inode) + newlen;
|
|
|
|
count -= size;
|
|
|
|
|
|
|
|
offset += sizeof(struct cramfs_inode);
|
|
|
|
|
|
|
|
memcpy(newpath + pathlen, romfs_read(offset), newlen);
|
|
|
|
newpath[pathlen + newlen] = 0;
|
|
|
|
if ((pathlen + newlen) - strlen(newpath) > 3) {
|
|
|
|
fprintf(stderr,
|
|
|
|
_("%s: invalid cramfs--bad "
|
|
|
|
"path length\n"),
|
|
|
|
filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
expand_fs(strlen(newpath), newpath, child);
|
|
|
|
|
|
|
|
offset += newlen;
|
|
|
|
|
|
|
|
if (offset > end_inode) {
|
|
|
|
end_inode = offset;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (S_ISREG(inode->mode)) {
|
|
|
|
int fd = 0;
|
|
|
|
unsigned long offset = inode->offset << 2;
|
|
|
|
|
|
|
|
if (offset > 0 && offset < start_data) {
|
|
|
|
start_data = offset;
|
|
|
|
}
|
|
|
|
if (opt_verbose) {
|
|
|
|
print_node('f', inode, path);
|
|
|
|
}
|
|
|
|
if (opt_extract) {
|
|
|
|
fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, inode->mode);
|
|
|
|
}
|
|
|
|
if (inode->size) {
|
|
|
|
do_uncompress(fd, offset, inode->size);
|
|
|
|
}
|
|
|
|
if (opt_extract) {
|
|
|
|
close(fd);
|
|
|
|
change_file_status(path, inode);
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (S_ISLNK(inode->mode)) {
|
|
|
|
unsigned long offset = inode->offset << 2;
|
|
|
|
|
|
|
|
if (offset < start_data) {
|
|
|
|
start_data = offset;
|
|
|
|
}
|
|
|
|
do_symlink(path, inode);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
do_special_inode(path, inode);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* INCLUDE_FS_TESTS */
|
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
|
|
|
void *buf;
|
|
|
|
size_t length;
|
|
|
|
struct stat st;
|
|
|
|
u32 crc_old, crc_new;
|
|
|
|
#ifdef INCLUDE_FS_TESTS
|
|
|
|
struct cramfs_inode *root;
|
|
|
|
#endif /* INCLUDE_FS_TESTS */
|
|
|
|
int c; /* for getopt */
|
|
|
|
int start = 0;
|
|
|
|
|
|
|
|
if (argc)
|
|
|
|
progname = argv[0];
|
|
|
|
|
|
|
|
/* command line options */
|
|
|
|
while ((c = getopt(argc, argv, "hx:v")) != EOF) {
|
|
|
|
switch (c) {
|
|
|
|
case 'h':
|
|
|
|
usage(0);
|
|
|
|
case 'x':
|
|
|
|
#ifdef INCLUDE_FS_TESTS
|
|
|
|
opt_extract = 1;
|
|
|
|
extract_dir = malloc(strlen(optarg) + 1);
|
|
|
|
strcpy(extract_dir, optarg);
|
|
|
|
break;
|
|
|
|
#else /* not INCLUDE_FS_TESTS */
|
|
|
|
fprintf(stderr, _("%s: compiled without -x support\n"),
|
|
|
|
progname);
|
|
|
|
exit(16);
|
|
|
|
#endif /* not INCLUDE_FS_TESTS */
|
|
|
|
case 'v':
|
|
|
|
opt_verbose++;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((argc - optind) != 1)
|
|
|
|
usage(16);
|
|
|
|
filename = argv[optind];
|
|
|
|
|
|
|
|
/* find the physical size of the file or block device */
|
|
|
|
if (lstat(filename, &st) < 0) {
|
|
|
|
perror(filename);
|
|
|
|
exit(8);
|
|
|
|
}
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
|
|
if (fd < 0) {
|
|
|
|
perror(filename);
|
|
|
|
exit(8);
|
|
|
|
}
|
|
|
|
if (S_ISBLK(st.st_mode)) {
|
|
|
|
if (ioctl(fd, BLKGETSIZE, &length) < 0) {
|
|
|
|
fprintf(stderr, _("%s: warning--unable to determine "
|
|
|
|
"filesystem size \n"), filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
length = length * 512;
|
|
|
|
}
|
|
|
|
else if (S_ISREG(st.st_mode)) {
|
|
|
|
length = st.st_size;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
fprintf(stderr, _("%s is not a block device or file\n"),
|
|
|
|
filename);
|
|
|
|
exit(8);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (length < sizeof(struct cramfs_super)) {
|
|
|
|
fprintf(stderr, _("%s: invalid cramfs--file length "
|
|
|
|
"too short\n"), filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (S_ISBLK(st.st_mode)) {
|
|
|
|
/* nasty because mmap of block devices fails */
|
|
|
|
buf = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|
|
|
read(fd, buf, length);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
/* nice and easy */
|
|
|
|
buf = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* XXX - this could be cleaner... */
|
|
|
|
if (((struct cramfs_super *) buf)->magic == CRAMFS_MAGIC) {
|
|
|
|
start = 0;
|
|
|
|
super = (struct cramfs_super *) buf;
|
|
|
|
}
|
|
|
|
else if (length >= (PAD_SIZE + sizeof(struct cramfs_super)) &&
|
|
|
|
((((struct cramfs_super *) (buf + PAD_SIZE))->magic == CRAMFS_MAGIC)))
|
|
|
|
{
|
|
|
|
start = PAD_SIZE;
|
|
|
|
super = (struct cramfs_super *) (buf + PAD_SIZE);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
fprintf(stderr, _("%s: invalid cramfs--wrong magic\n"),
|
|
|
|
filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (super->flags & CRAMFS_FLAG_FSID_VERSION_2) {
|
|
|
|
/* length test */
|
|
|
|
if (length < super->size) {
|
|
|
|
fprintf(stderr, _("%s: invalid cramfs--file length "
|
|
|
|
"too short\n"), filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
else if (length > super->size) {
|
|
|
|
fprintf(stderr, _("%s: warning--file length too long, "
|
|
|
|
"padded image?\n"), filename);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* CRC test */
|
|
|
|
crc_old = super->fsid.crc;
|
|
|
|
super->fsid.crc = crc32(0L, Z_NULL, 0);
|
|
|
|
crc_new = crc32(0L, Z_NULL, 0);
|
|
|
|
crc_new = crc32(crc_new, (unsigned char *) buf+start, super->size - start);
|
|
|
|
if (crc_new != crc_old) {
|
|
|
|
fprintf(stderr, _("%s: invalid cramfs--crc error\n"),
|
|
|
|
filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
fprintf(stderr, _("%s: warning--old cramfs image, no CRC\n"),
|
|
|
|
filename);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef INCLUDE_FS_TESTS
|
|
|
|
super = (struct cramfs_super *) malloc(sizeof(struct cramfs_super));
|
|
|
|
if (((struct cramfs_super *) buf)->magic == CRAMFS_MAGIC) {
|
|
|
|
memcpy(super, buf, sizeof(struct cramfs_super));
|
|
|
|
}
|
|
|
|
else if (length >= (PAD_SIZE + sizeof(struct cramfs_super)) &&
|
|
|
|
((((struct cramfs_super *) (buf + PAD_SIZE))->magic == CRAMFS_MAGIC)))
|
|
|
|
{
|
|
|
|
memcpy(super, (buf + PAD_SIZE), sizeof(struct cramfs_super));
|
|
|
|
}
|
|
|
|
|
|
|
|
munmap(buf, length);
|
|
|
|
|
|
|
|
/* file format test, uses fake "blocked" accesses */
|
|
|
|
root = read_super();
|
|
|
|
umask(0);
|
|
|
|
euid = geteuid();
|
|
|
|
if (!root) {
|
|
|
|
fprintf(stderr, _("%s: invalid cramfs--bad superblock\n"),
|
|
|
|
filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
stream.next_in = NULL;
|
|
|
|
stream.avail_in = 0;
|
|
|
|
inflateInit(&stream);
|
|
|
|
|
|
|
|
if (!extract_dir)
|
|
|
|
extract_dir = "root";
|
|
|
|
|
|
|
|
expand_fs(strlen(extract_dir), extract_dir, root);
|
|
|
|
inflateEnd(&stream);
|
|
|
|
|
|
|
|
if (start_data != 1 << 28 && end_inode != start_data) {
|
|
|
|
fprintf(stderr,
|
|
|
|
_("%s: invalid cramfs--directory data end "
|
|
|
|
"(%ld) != file data start (%ld)\n"),
|
|
|
|
filename, end_inode, start_data);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
if (super->flags & CRAMFS_FLAG_FSID_VERSION_2) {
|
|
|
|
if (end_data > super->size) {
|
|
|
|
fprintf(stderr,
|
|
|
|
_("%s: invalid cramfs--invalid file "
|
|
|
|
"data offset\n"),
|
|
|
|
filename);
|
|
|
|
exit(4);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* INCLUDE_FS_TESTS */
|
|
|
|
|
|
|
|
exit(0);
|
|
|
|
}
|