947 lines
29 KiB
C
Executable File
947 lines
29 KiB
C
Executable File
/*
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* Unsquash a squashfs filesystem. This is a highly compressed read only filesystem.
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*
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* Copyright (c) 2002, 2003, 2004, 2005, 2006
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* Phillip Lougher <phillip@lougher.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* unsquash.c
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*/
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#define TRUE 1
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#define FALSE 0
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <zlib.h>
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#include <sys/mman.h>
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#include <utime.h>
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#ifndef linux
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#define __BYTE_ORDER BYTE_ORDER
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#define __BIG_ENDIAN BIG_ENDIAN
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#define __LITTLE_ENDIAN LITTLE_ENDIAN
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#else
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#include <endian.h>
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#endif
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#include <squashfs_fs.h>
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#include "read_fs.h"
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#include "global.h"
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#include <stdlib.h>
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#ifdef SQUASHFS_TRACE
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#define TRACE(s, args...) do { \
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printf("mksquashfs: "s, ## args); \
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} while(0)
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#else
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#define TRACE(s, args...)
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#endif
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#define ERROR(s, args...) do { \
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fprintf(stderr, s, ## args); \
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} while(0)
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#define EXIT_UNSQUASH(s, args...) do { \
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fprintf(stderr, "FATAL ERROR aborting: "s, ## args); \
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} while(0)
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struct hash_table_entry {
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int start;
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int bytes;
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struct hash_table_entry *next;
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};
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int bytes = 0, swap, file_count = 0, dir_count = 0, sym_count = 0, dev_count = 0, fifo_count = 0;
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char *inode_table = NULL, *directory_table = NULL;
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struct hash_table_entry *inode_table_hash[65536], *directory_table_hash[65536];
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int fd;
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squashfs_fragment_entry *fragment_table;
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unsigned int *uid_table, *guid_table;
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unsigned int cached_frag = SQUASHFS_INVALID_FRAG;
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char *fragment_data;
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char *file_data;
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char *data;
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unsigned int block_size;
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int lsonly = FALSE, info = FALSE;
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char **created_inode;
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#define CALCULATE_HASH(start) (start & 0xffff)
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int add_entry(struct hash_table_entry *hash_table[], int start, int bytes)
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{
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int hash = CALCULATE_HASH(start);
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struct hash_table_entry *hash_table_entry;
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if((hash_table_entry = malloc(sizeof(struct hash_table_entry))) == NULL) {
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ERROR("add_hash: out of memory in malloc\n");
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return FALSE;
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}
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hash_table_entry->start = start;
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hash_table_entry->bytes = bytes;
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hash_table_entry->next = hash_table[hash];
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hash_table[hash] = hash_table_entry;
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return TRUE;
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}
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int lookup_entry(struct hash_table_entry *hash_table[], int start)
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{
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int hash = CALCULATE_HASH(start);
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struct hash_table_entry *hash_table_entry;
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for(hash_table_entry = hash_table[hash]; hash_table_entry; hash_table_entry = hash_table_entry->next)
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if(hash_table_entry->start == start)
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return hash_table_entry->bytes;
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return -1;
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}
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int read_bytes(long long byte, int bytes, char *buff)
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{
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off_t off = byte;
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TRACE("read_bytes: reading from position 0x%llx, bytes %d\n", byte, bytes);
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if(lseek(fd, off, SEEK_SET) == -1) {
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ERROR("Lseek failed because %s\b", strerror(errno));
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return FALSE;
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}
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if(read(fd, buff, bytes) == -1) {
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ERROR("Read on destination failed because %s\n", strerror(errno));
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return FALSE;
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}
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return TRUE;
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}
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int read_block(long long start, long long *next, char *block, squashfs_super_block *sBlk)
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{
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unsigned short c_byte;
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int offset = 2;
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if(swap) {
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if(read_bytes(start, 2, block) == FALSE)
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goto failed;
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((unsigned char *) &c_byte)[1] = block[0];
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((unsigned char *) &c_byte)[0] = block[1];
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} else
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if(read_bytes(start, 2, (char *)&c_byte) == FALSE)
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goto failed;
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TRACE("read_block: block @0x%llx, %d %s bytes\n", start, SQUASHFS_COMPRESSED_SIZE(c_byte), SQUASHFS_COMPRESSED(c_byte) ? "compressed" : "uncompressed");
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if(SQUASHFS_CHECK_DATA(sBlk->flags))
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offset = 3;
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if(SQUASHFS_COMPRESSED(c_byte)) {
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char buffer[SQUASHFS_METADATA_SIZE];
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int res;
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unsigned long bytes = SQUASHFS_METADATA_SIZE;
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c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
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if(read_bytes(start + offset, c_byte, buffer) == FALSE)
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goto failed;
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if((res = uncompress((unsigned char *) block, &bytes, (const unsigned char *) buffer, c_byte)) != Z_OK) {
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if(res == Z_MEM_ERROR)
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ERROR("zlib::uncompress failed, not enough memory\n");
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else if(res == Z_BUF_ERROR)
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ERROR("zlib::uncompress failed, not enough room in output buffer\n");
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else
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ERROR("zlib::uncompress failed, unknown error %d\n", res);
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goto failed;
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}
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if(next)
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*next = start + offset + c_byte;
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return bytes;
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} else {
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c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
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if(read_bytes(start + offset, c_byte, block) == FALSE)
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goto failed;
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if(next)
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*next = start + offset + c_byte;
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return c_byte;
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}
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failed:
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return FALSE;
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}
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int read_data_block(long long start, unsigned int size, char *block)
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{
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int res;
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unsigned long bytes = block_size;
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int c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(size);
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TRACE("read_data_block: block @0x%llx, %d %s bytes\n", start, SQUASHFS_COMPRESSED_SIZE_BLOCK(c_byte), SQUASHFS_COMPRESSED_BLOCK(c_byte) ? "compressed" : "uncompressed");
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if(SQUASHFS_COMPRESSED_BLOCK(size)) {
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if(read_bytes(start, c_byte, data) == FALSE)
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return 0;
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if((res = uncompress((unsigned char *) block, &bytes, (const unsigned char *) data, c_byte)) != Z_OK) {
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if(res == Z_MEM_ERROR)
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ERROR("zlib::uncompress failed, not enough memory\n");
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else if(res == Z_BUF_ERROR)
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ERROR("zlib::uncompress failed, not enough room in output buffer\n");
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else
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ERROR("zlib::uncompress failed, unknown error %d\n", res);
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return 0;
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}
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return bytes;
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} else {
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if(read_bytes(start, c_byte, block) == FALSE)
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return 0;
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return c_byte;
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}
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}
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void uncompress_inode_table(long long start, long long end, squashfs_super_block *sBlk)
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{
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int size = 0, bytes = 0, res;
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while(start < end) {
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if((size - bytes < SQUASHFS_METADATA_SIZE) &&
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((inode_table = realloc(inode_table, size += SQUASHFS_METADATA_SIZE)) == NULL))
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EXIT_UNSQUASH("uncompress_inode_table: out of memory in realloc\n");
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TRACE("uncompress_inode_table: reading block 0x%llx\n", start);
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add_entry(inode_table_hash, start, bytes);
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if((res = read_block(start, &start, inode_table + bytes, sBlk)) == 0) {
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free(inode_table);
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EXIT_UNSQUASH("uncompress_inode_table: failed to read block\n");
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}
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bytes += res;
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}
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}
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int set_attributes(char *pathname, unsigned int mode, unsigned int uid, unsigned int guid,
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unsigned int mtime, unsigned int set_mode)
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{
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struct utimbuf times = { (time_t) mtime, (time_t) mtime };
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if(utime(pathname, ×) == -1) {
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ERROR("set_attributes: failed to set time on %s, because %s\n", pathname, strerror(errno));
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return FALSE;
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}
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if(set_mode && chmod(pathname, (mode_t) mode) == -1) {
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ERROR("set_attributes: failed to change mode %s, because %s\n", pathname, strerror(errno));
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return FALSE;
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}
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if(geteuid() == 0) {
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uid_t uid_value = (uid_t) uid_table[uid];
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uid_t guid_value = guid == SQUASHFS_GUIDS ? uid_value : (uid_t) guid_table[guid];
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if(chown(pathname, uid_value, guid_value) == -1) {
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ERROR("set_attributes: failed to change uid and gids on %s, because %s\n", pathname, strerror(errno));
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return FALSE;
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}
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}
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return TRUE;
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}
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void read_uids_guids(squashfs_super_block *sBlk)
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{
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if((uid_table = malloc((sBlk->no_uids + sBlk->no_guids) * sizeof(unsigned int))) == NULL)
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EXIT_UNSQUASH("read_uids_guids: failed to allocate uid/gid table\n");
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guid_table = uid_table + sBlk->no_uids;
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if(read_bytes(sBlk->uid_start, (sBlk->no_uids + sBlk->no_guids) * sizeof(unsigned int), (char *) uid_table) ==
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FALSE)
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EXIT_UNSQUASH("read_uids_guids: failed to read uid/gid table\n");
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}
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void read_fragment_table(squashfs_super_block *sBlk)
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{
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int i, indexes = SQUASHFS_FRAGMENT_INDEXES(sBlk->fragments);
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squashfs_fragment_index fragment_table_index[indexes];
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TRACE("read_fragment_table: %d fragments, reading %d fragment indexes from 0x%llx\n", sBlk->fragments, indexes, sBlk->fragment_table_start);
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if(sBlk->fragments == 0)
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return;
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if((fragment_table = (squashfs_fragment_entry *) malloc(sBlk->fragments * sizeof(squashfs_fragment_entry))) == NULL)
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EXIT_UNSQUASH("read_fragment_table: failed to allocate fragment table\n");
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if(swap) {
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squashfs_fragment_index sfragment_table_index[indexes];
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read_bytes(sBlk->fragment_table_start, SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments), (char *) sfragment_table_index);
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SQUASHFS_SWAP_FRAGMENT_INDEXES(fragment_table_index, sfragment_table_index, indexes);
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} else
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read_bytes(sBlk->fragment_table_start, SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk->fragments), (char *) fragment_table_index);
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for(i = 0; i < indexes; i++) {
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int length = read_block(fragment_table_index[i], NULL, ((char *) fragment_table) + (i * SQUASHFS_METADATA_SIZE), sBlk);
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TRACE("Read fragment table block %d, from 0x%llx, length %d\n", i, fragment_table_index[i], length);
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}
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if(swap) {
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squashfs_fragment_entry sfragment;
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for(i = 0; i < sBlk->fragments; i++) {
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SQUASHFS_SWAP_FRAGMENT_ENTRY((&sfragment), (&fragment_table[i]));
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memcpy((char *) &fragment_table[i], (char *) &sfragment, sizeof(squashfs_fragment_entry));
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}
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}
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}
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|
|
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char *read_fragment(unsigned int fragment)
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{
|
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TRACE("read_fragment: reading fragment %d\n", fragment);
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|
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if(cached_frag == SQUASHFS_INVALID_FRAG || fragment != cached_frag) {
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squashfs_fragment_entry *fragment_entry = &fragment_table[fragment];
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if(read_data_block(fragment_entry->start_block, fragment_entry->size, fragment_data) == 0) {
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ERROR("read_fragment: failed to read fragment %d\n", fragment);
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cached_frag = SQUASHFS_INVALID_FRAG;
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return NULL;
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}
|
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cached_frag = fragment;
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}
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|
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return fragment_data;
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}
|
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|
|
|
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int write_file(char *pathname, unsigned int fragment, unsigned int frag_bytes, unsigned int offset,
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unsigned int blocks, long long start, char *block_ptr, unsigned int mode)
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{
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unsigned int file_fd, bytes, i;
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unsigned int *block_list;
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|
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TRACE("write_file: regular file, blocks %d\n", blocks);
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|
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if((block_list = malloc(blocks * sizeof(unsigned int))) == NULL) {
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ERROR("write_file: unable to malloc block list\n");
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return FALSE;
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}
|
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|
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if(swap) {
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unsigned int sblock_list[blocks];
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memcpy(sblock_list, block_ptr, blocks * sizeof(unsigned int));
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SQUASHFS_SWAP_INTS(block_list, sblock_list, blocks);
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} else
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memcpy(block_list, block_ptr, blocks * sizeof(unsigned int));
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|
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if((file_fd = open(pathname, O_CREAT | O_WRONLY, (mode_t) mode)) == -1) {
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ERROR("write_file: failed to create file %s, because %s\n", pathname,
|
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strerror(errno));
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free(block_list);
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return FALSE;
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}
|
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|
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for(i = 0; i < blocks; i++) {
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if((bytes = read_data_block(start, block_list[i], file_data)) == 0) {
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ERROR("write_file: failed to read data block 0x%llx\n", start);
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goto failure;
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}
|
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if(write(file_fd, file_data, bytes) < bytes) {
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ERROR("write_file: failed to write data block 0x%llx\n", start);
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goto failure;
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}
|
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start += SQUASHFS_COMPRESSED_SIZE_BLOCK(block_list[i]);
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}
|
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|
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if(frag_bytes != 0) {
|
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char *fragment_data = read_fragment(fragment);
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|
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if(fragment_data == NULL)
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goto failure;
|
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|
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if(write(file_fd, fragment_data + offset, frag_bytes) < frag_bytes) {
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ERROR("write_file: failed to write fragment %d\n", fragment);
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goto failure;
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}
|
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}
|
|
|
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close(file_fd);
|
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return TRUE;
|
|
|
|
failure:
|
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close(file_fd);
|
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free(block_list);
|
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return FALSE;
|
|
}
|
|
|
|
|
|
int create_inode(char *pathname, unsigned int start_block, unsigned int offset, squashfs_super_block *sBlk)
|
|
{
|
|
long long start = sBlk->inode_table_start + start_block;
|
|
squashfs_inode_header header;
|
|
char *block_ptr;
|
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int bytes = lookup_entry(inode_table_hash, start), file_fd;
|
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|
|
TRACE("create_inode: pathname %s, start 0x%llx, offset %d\n", pathname, start, offset);
|
|
|
|
if(bytes == -1) {
|
|
ERROR("create_inode: inode block 0x%llx out of range!\n", start);
|
|
return FALSE;
|
|
}
|
|
block_ptr = inode_table + bytes + offset;
|
|
|
|
if(swap) {
|
|
squashfs_base_inode_header sinode;
|
|
memcpy(&sinode, block_ptr, sizeof(header.base));
|
|
SQUASHFS_SWAP_BASE_INODE_HEADER(&header.base, &sinode, sizeof(squashfs_base_inode_header));
|
|
} else
|
|
memcpy(&header.base, block_ptr, sizeof(header.base));
|
|
|
|
if(created_inode[header.base.inode_number - 1]) {
|
|
TRACE("create_inode: hard link\n");
|
|
if(link(created_inode[header.base.inode_number - 1], pathname) == -1) {
|
|
ERROR("create_inode: failed to create hardlink, because %s\n", strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
switch(header.base.inode_type) {
|
|
case SQUASHFS_FILE_TYPE: {
|
|
unsigned int frag_bytes;
|
|
unsigned int blocks;
|
|
unsigned int offset;
|
|
long long start;
|
|
squashfs_reg_inode_header *inode = &header.reg;
|
|
|
|
if(swap) {
|
|
squashfs_reg_inode_header sinode;
|
|
memcpy(&sinode, block_ptr, sizeof(sinode));
|
|
SQUASHFS_SWAP_REG_INODE_HEADER(inode, &sinode);
|
|
} else
|
|
memcpy(inode, block_ptr, sizeof(*inode));
|
|
|
|
frag_bytes = inode->fragment == SQUASHFS_INVALID_FRAG ? 0 : inode->file_size % sBlk->block_size;
|
|
offset = inode->offset;
|
|
blocks = inode->fragment == SQUASHFS_INVALID_FRAG ? (inode->file_size
|
|
+ sBlk->block_size - 1) >> sBlk->block_log : inode->file_size >>
|
|
sBlk->block_log;
|
|
start = inode->start_block;
|
|
|
|
TRACE("create_inode: regular file, file_size %lld, blocks %d\n", inode->file_size, blocks);
|
|
|
|
if(write_file(pathname, inode->fragment, frag_bytes, offset, blocks, start,
|
|
block_ptr + sizeof(*inode), inode->mode)) {
|
|
set_attributes(pathname, inode->mode, inode->uid, inode->guid, inode->mtime, FALSE);
|
|
file_count ++;
|
|
}
|
|
break;
|
|
}
|
|
case SQUASHFS_LREG_TYPE: {
|
|
unsigned int frag_bytes;
|
|
unsigned int blocks;
|
|
unsigned int offset;
|
|
long long start;
|
|
squashfs_lreg_inode_header *inode = &header.lreg;
|
|
|
|
if(swap) {
|
|
squashfs_lreg_inode_header sinode;
|
|
memcpy(&sinode, block_ptr, sizeof(sinode));
|
|
SQUASHFS_SWAP_LREG_INODE_HEADER(inode, &sinode);
|
|
} else
|
|
memcpy(inode, block_ptr, sizeof(*inode));
|
|
|
|
frag_bytes = inode->fragment == SQUASHFS_INVALID_FRAG ? 0 : inode->file_size % sBlk->block_size;
|
|
offset = inode->offset;
|
|
blocks = inode->fragment == SQUASHFS_INVALID_FRAG ? (inode->file_size
|
|
+ sBlk->block_size - 1) >> sBlk->block_log : inode->file_size >>
|
|
sBlk->block_log;
|
|
start = inode->start_block;
|
|
|
|
TRACE("create_inode: regular file, file_size %lld, blocks %d\n", inode->file_size, blocks);
|
|
|
|
if(write_file(pathname, inode->fragment, frag_bytes, offset, blocks, start,
|
|
block_ptr + sizeof(*inode), inode->mode)) {
|
|
set_attributes(pathname, inode->mode, inode->uid, inode->guid, inode->mtime, FALSE);
|
|
file_count ++;
|
|
}
|
|
break;
|
|
}
|
|
case SQUASHFS_SYMLINK_TYPE: {
|
|
squashfs_symlink_inode_header *inodep = &header.symlink;
|
|
char name[65536];
|
|
|
|
if(swap) {
|
|
squashfs_symlink_inode_header sinodep;
|
|
memcpy(&sinodep, block_ptr, sizeof(sinodep));
|
|
SQUASHFS_SWAP_SYMLINK_INODE_HEADER(inodep, &sinodep);
|
|
} else
|
|
memcpy(inodep, block_ptr, sizeof(*inodep));
|
|
|
|
TRACE("create_inode: symlink, symlink_size %d\n", inodep->symlink_size);
|
|
|
|
strncpy(name, block_ptr + sizeof(squashfs_symlink_inode_header), inodep->symlink_size);
|
|
name[inodep->symlink_size] = '\0';
|
|
|
|
if(symlink(name, pathname) == -1) {
|
|
ERROR("create_inode: failed to create symlink %s, because %s\n", pathname,
|
|
strerror(errno));
|
|
break;
|
|
}
|
|
|
|
if(geteuid() == 0) {
|
|
uid_t uid_value = (uid_t) uid_table[inodep->uid];
|
|
uid_t guid_value = inodep->guid == SQUASHFS_GUIDS ? uid_value : (uid_t) guid_table[inodep->guid];
|
|
|
|
if(lchown(pathname, uid_value, guid_value) == -1)
|
|
ERROR("create_inode: failed to change uid and gids on %s, because %s\n", pathname, strerror(errno));
|
|
}
|
|
|
|
sym_count ++;
|
|
break;
|
|
}
|
|
case SQUASHFS_BLKDEV_TYPE:
|
|
case SQUASHFS_CHRDEV_TYPE: {
|
|
squashfs_dev_inode_header *inodep = &header.dev;
|
|
|
|
if(swap) {
|
|
squashfs_dev_inode_header sinodep;
|
|
memcpy(&sinodep, block_ptr, sizeof(sinodep));
|
|
SQUASHFS_SWAP_DEV_INODE_HEADER(inodep, &sinodep);
|
|
} else
|
|
memcpy(inodep, block_ptr, sizeof(*inodep));
|
|
|
|
TRACE("create_inode: dev, rdev 0x%x\n", inodep->rdev);
|
|
|
|
if(geteuid() == 0) {
|
|
if(mknod(pathname, inodep->inode_type == SQUASHFS_CHRDEV_TYPE ? S_IFCHR : S_IFBLK,
|
|
makedev((inodep->rdev >> 8) & 0xff, inodep->rdev & 0xff))
|
|
== -1) {
|
|
ERROR("create_inode: failed to create %s device %s, because %s\n",
|
|
inodep->inode_type == SQUASHFS_CHRDEV_TYPE ? "character" : "block",
|
|
pathname, strerror(errno));
|
|
break;
|
|
}
|
|
set_attributes(pathname, inodep->mode, inodep->uid, inodep->guid, inodep->mtime, TRUE);
|
|
dev_count ++;
|
|
} else
|
|
ERROR("create_inode: could not create %s device %s, because you're not superuser!\n",
|
|
inodep->inode_type == SQUASHFS_CHRDEV_TYPE ? "character" : "block",
|
|
pathname, strerror(errno));
|
|
break;
|
|
}
|
|
case SQUASHFS_FIFO_TYPE:
|
|
TRACE("create_inode: fifo\n");
|
|
|
|
if(mknod(pathname, S_IFIFO, 0) == -1) {
|
|
ERROR("create_inode: failed to create fifo %s, because %s\n",
|
|
pathname, strerror(errno));
|
|
break;
|
|
}
|
|
set_attributes(pathname, header.base.mode, header.base.uid, header.base.guid,
|
|
header.base.mtime, TRUE);
|
|
fifo_count ++;
|
|
break;
|
|
case SQUASHFS_SOCKET_TYPE:
|
|
TRACE("create_inode: socket\n");
|
|
ERROR("create_inode: socket %s ignored\n", pathname);
|
|
break;
|
|
default:
|
|
ERROR("Unknown inode type %d in create_inode_table!\n", header.base.inode_type);
|
|
return FALSE;
|
|
}
|
|
|
|
created_inode[header.base.inode_number - 1] = strdup(pathname);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
void uncompress_directory_table(long long start, long long end, squashfs_super_block *sBlk)
|
|
{
|
|
int bytes = 0, size = 0, res;
|
|
|
|
while(start < end) {
|
|
if(size - bytes < SQUASHFS_METADATA_SIZE && (directory_table = realloc(directory_table, size += SQUASHFS_METADATA_SIZE)) == NULL)
|
|
EXIT_UNSQUASH("uncompress_directory_table: out of memory in realloc\n");
|
|
TRACE("uncompress_directory_table: reading block 0x%llx\n", start);
|
|
add_entry(directory_table_hash, start, bytes);
|
|
if((res = read_block(start, &start, directory_table + bytes, sBlk)) == 0)
|
|
EXIT_UNSQUASH("uncompress_directory_table: failed to read block\n");
|
|
bytes += res;
|
|
}
|
|
}
|
|
|
|
|
|
#define DIR_ENT_SIZE 16
|
|
|
|
struct dir_ent {
|
|
char name[SQUASHFS_NAME_LEN + 1];
|
|
unsigned int start_block;
|
|
unsigned int offset;
|
|
unsigned int type;
|
|
};
|
|
|
|
struct dir {
|
|
int dir_count;
|
|
int cur_entry;
|
|
unsigned int mode;
|
|
unsigned int uid;
|
|
unsigned int guid;
|
|
unsigned int mtime;
|
|
struct dir_ent *dirs;
|
|
};
|
|
|
|
|
|
struct dir *squashfs_openddir(unsigned int block_start, unsigned int offset, squashfs_super_block *sBlk)
|
|
{
|
|
squashfs_dir_header dirh;
|
|
char buffer[sizeof(squashfs_dir_entry) + SQUASHFS_NAME_LEN + 1];
|
|
squashfs_dir_entry *dire = (squashfs_dir_entry *) buffer;
|
|
long long start = sBlk->inode_table_start + block_start;
|
|
char *block_ptr;
|
|
int bytes = lookup_entry(inode_table_hash, start);
|
|
squashfs_inode_header header;
|
|
int dir_count, size;
|
|
struct dir_ent *new_dir;
|
|
struct dir *dir;
|
|
|
|
TRACE("squashfs_opendir: inode start block %d, offset %d\n", block_start, offset);
|
|
|
|
if(bytes == -1) {
|
|
ERROR("squashfs_opendir: inode block %d not found!\n", block_start);
|
|
return NULL;
|
|
}
|
|
block_ptr = inode_table + bytes + offset;
|
|
|
|
if(swap) {
|
|
squashfs_dir_inode_header sinode;
|
|
memcpy(&sinode, block_ptr, sizeof(header.dir));
|
|
SQUASHFS_SWAP_DIR_INODE_HEADER(&header.dir, &sinode);
|
|
} else
|
|
memcpy(&header.dir, block_ptr, sizeof(header.dir));
|
|
|
|
switch(header.dir.inode_type) {
|
|
case SQUASHFS_DIR_TYPE:
|
|
block_start = header.dir.start_block;
|
|
offset = header.dir.offset;
|
|
size = header.dir.file_size;
|
|
break;
|
|
case SQUASHFS_LDIR_TYPE:
|
|
if(swap) {
|
|
squashfs_ldir_inode_header sinode;
|
|
memcpy(&sinode, block_ptr, sizeof(header.ldir));
|
|
SQUASHFS_SWAP_LDIR_INODE_HEADER(&header.ldir, &sinode);
|
|
} else
|
|
memcpy(&header.ldir, block_ptr, sizeof(header.ldir));
|
|
block_start = header.ldir.start_block;
|
|
offset = header.ldir.offset;
|
|
size = header.ldir.file_size;
|
|
break;
|
|
default:
|
|
ERROR("squashfs_opendir: inode not a directory\n");
|
|
return NULL;
|
|
}
|
|
|
|
start = sBlk->directory_table_start + block_start;
|
|
bytes = lookup_entry(directory_table_hash, start);
|
|
|
|
if(bytes == -1) {
|
|
ERROR("squashfs_opendir: directory block %d not found!\n", block_start);
|
|
return NULL;
|
|
}
|
|
bytes += offset;
|
|
size += bytes - 3;
|
|
|
|
if((dir = malloc(sizeof(struct dir))) == NULL) {
|
|
ERROR("squashfs_opendir: malloc failed!\n");
|
|
return NULL;
|
|
}
|
|
|
|
dir->dir_count = 0;
|
|
dir->cur_entry = 0;
|
|
dir->mode = header.dir.mode;
|
|
dir->uid = header.dir.uid;
|
|
dir->guid = header.dir.guid;
|
|
dir->mtime = header.dir.mtime;
|
|
dir->dirs = NULL;
|
|
|
|
while(bytes < size) {
|
|
if(swap) {
|
|
squashfs_dir_header sdirh;
|
|
memcpy(&sdirh, directory_table + bytes, sizeof(sdirh));
|
|
SQUASHFS_SWAP_DIR_HEADER(&dirh, &sdirh);
|
|
} else
|
|
memcpy(&dirh, directory_table + bytes, sizeof(dirh));
|
|
|
|
dir_count = dirh.count + 1;
|
|
TRACE("squashfs_opendir: Read directory header @ byte position %d, %d directory entries\n", bytes, dir_count);
|
|
bytes += sizeof(dirh);
|
|
|
|
while(dir_count--) {
|
|
if(swap) {
|
|
squashfs_dir_entry sdire;
|
|
memcpy(&sdire, directory_table + bytes, sizeof(sdire));
|
|
SQUASHFS_SWAP_DIR_ENTRY(dire, &sdire);
|
|
} else
|
|
memcpy(dire, directory_table + bytes, sizeof(dire));
|
|
bytes += sizeof(*dire);
|
|
|
|
memcpy(dire->name, directory_table + bytes, dire->size + 1);
|
|
dire->name[dire->size + 1] = '\0';
|
|
TRACE("squashfs_opendir: directory entry %s, inode %d:%d, type %d\n", dire->name, dirh.start_block, dire->offset, dire->type);
|
|
if((dir->dir_count % DIR_ENT_SIZE) == 0) {
|
|
if((new_dir = realloc(dir->dirs, (dir->dir_count + DIR_ENT_SIZE) * sizeof(struct dir_ent))) == NULL) {
|
|
ERROR("squashfs_opendir: realloc failed!\n");
|
|
free(dir->dirs);
|
|
free(dir);
|
|
return NULL;
|
|
}
|
|
dir->dirs = new_dir;
|
|
}
|
|
strcpy(dir->dirs[dir->dir_count].name, dire->name);
|
|
dir->dirs[dir->dir_count].start_block = dirh.start_block;
|
|
dir->dirs[dir->dir_count].offset = dire->offset;
|
|
dir->dirs[dir->dir_count].type = dire->type;
|
|
dir->dir_count ++;
|
|
bytes += dire->size + 1;
|
|
}
|
|
}
|
|
|
|
return dir;
|
|
}
|
|
|
|
|
|
int squashfs_readdir(struct dir *dir, char **name, unsigned int *start_block, unsigned int *offset, unsigned int *type)
|
|
{
|
|
if(dir->cur_entry == dir->dir_count)
|
|
return FALSE;
|
|
|
|
*name = dir->dirs[dir->cur_entry].name;
|
|
*start_block = dir->dirs[dir->cur_entry].start_block;
|
|
*offset = dir->dirs[dir->cur_entry].offset;
|
|
*type = dir->dirs[dir->cur_entry].type;
|
|
dir->cur_entry ++;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
void squashfs_closedir(struct dir *dir)
|
|
{
|
|
free(dir->dirs);
|
|
free(dir);
|
|
}
|
|
|
|
|
|
int dir_scan(char *parent_name, unsigned int start_block, unsigned int offset, squashfs_super_block *sBlk)
|
|
{
|
|
struct dir *dir = squashfs_openddir(start_block, offset, sBlk);
|
|
unsigned int type;
|
|
char *name, pathname[1024];
|
|
|
|
if(dir == NULL) {
|
|
ERROR("dir_scan: Failed to read directory %s (%x:%x)\n", parent_name, start_block, offset);
|
|
return FALSE;
|
|
}
|
|
|
|
if(!lsonly && mkdir(parent_name, (mode_t) dir->mode) == -1) {
|
|
ERROR("dir_scan: failed to open directory %s, because %s\n", parent_name, strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
while(squashfs_readdir(dir, &name, &start_block, &offset, &type)) {
|
|
TRACE("dir_scan: name %s, start_block %d, offset %d, type %d\n", name, start_block, offset, type);
|
|
|
|
strcat(strcat(strcpy(pathname, parent_name), "/"), name);
|
|
|
|
if(lsonly || info)
|
|
printf("%s\n", pathname);
|
|
|
|
if(type == SQUASHFS_DIR_TYPE)
|
|
dir_scan(pathname, start_block, offset, sBlk);
|
|
else
|
|
if(!lsonly)
|
|
create_inode(pathname, start_block, offset, sBlk);
|
|
}
|
|
|
|
!lsonly && set_attributes(parent_name, dir->mode, dir->uid, dir->guid, dir->mtime, TRUE);
|
|
|
|
squashfs_closedir(dir);
|
|
dir_count ++;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
int read_super(squashfs_super_block *sBlk, char *source)
|
|
{
|
|
read_bytes(SQUASHFS_START, sizeof(squashfs_super_block), (char *) sBlk);
|
|
|
|
/* Check it is a SQUASHFS superblock */
|
|
swap = 0;
|
|
if(sBlk->s_magic != SQUASHFS_MAGIC) {
|
|
if(sBlk->s_magic == SQUASHFS_MAGIC_SWAP) {
|
|
squashfs_super_block sblk;
|
|
ERROR("Reading a different endian SQUASHFS filesystem on %s\n", source);
|
|
SQUASHFS_SWAP_SUPER_BLOCK(&sblk, sBlk);
|
|
memcpy(sBlk, &sblk, sizeof(squashfs_super_block));
|
|
swap = 1;
|
|
} else {
|
|
ERROR("Can't find a SQUASHFS superblock on %s\n", source);
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
/* Check the MAJOR & MINOR versions */
|
|
if(sBlk->s_major != SQUASHFS_MAJOR || sBlk->s_minor > SQUASHFS_MINOR) {
|
|
ERROR("Major/Minor mismatch, filesystem on %s is (%d:%d)\n",
|
|
source, sBlk->s_major, sBlk->s_minor);
|
|
ERROR("I only support Squashfs 3.0 filesystems! Later releases will support older Squashfs filesystems\n");
|
|
goto failed_mount;
|
|
}
|
|
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
TRACE("Found a valid %s endian SQUASHFS superblock on %s.\n", swap ? "little" : "big", source);
|
|
#else
|
|
TRACE("Found a valid %s endian SQUASHFS superblock on %s.\n", swap ? "big" : "little", source);
|
|
#endif
|
|
|
|
TRACE("\tInodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(sBlk->flags) ? "un" : "");
|
|
TRACE("\tData is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(sBlk->flags) ? "un" : "");
|
|
TRACE("\tFragments are %scompressed\n", SQUASHFS_UNCOMPRESSED_FRAGMENTS(sBlk->flags) ? "un" : "");
|
|
TRACE("\tCheck data is %s present in the filesystem\n", SQUASHFS_CHECK_DATA(sBlk->flags) ? "" : "not");
|
|
TRACE("\tFragments are %s present in the filesystem\n", SQUASHFS_NO_FRAGMENTS(sBlk->flags) ? "not" : "");
|
|
TRACE("\tAlways_use_fragments option is %s specified\n", SQUASHFS_ALWAYS_FRAGMENTS(sBlk->flags) ? "" : "not");
|
|
TRACE("\tDuplicates are %s removed\n", SQUASHFS_DUPLICATES(sBlk->flags) ? "" : "not");
|
|
TRACE("\tFilesystem size %.2f Kbytes (%.2f Mbytes)\n", sBlk->bytes_used / 1024.0, sBlk->bytes_used / (1024.0 * 1024.0));
|
|
TRACE("\tBlock size %d\n", sBlk->block_size);
|
|
TRACE("\tNumber of fragments %d\n", sBlk->fragments);
|
|
TRACE("\tNumber of inodes %d\n", sBlk->inodes);
|
|
TRACE("\tNumber of uids %d\n", sBlk->no_uids);
|
|
TRACE("\tNumber of gids %d\n", sBlk->no_guids);
|
|
TRACE("sBlk->inode_table_start 0x%llx\n", sBlk->inode_table_start);
|
|
TRACE("sBlk->directory_table_start 0x%llx\n", sBlk->directory_table_start);
|
|
TRACE("sBlk->uid_start 0x%llx\n", sBlk->uid_start);
|
|
TRACE("sBlk->fragment_table_start 0x%llx\n", sBlk->fragment_table_start);
|
|
TRACE("\n");
|
|
|
|
return TRUE;
|
|
|
|
failed_mount:
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
#define VERSION() \
|
|
printf("unsquashfs version 1.0 (2006/03/15)\n");\
|
|
printf("copyright (C) 2006 Phillip Lougher <phillip@lougher.org.uk>\n\n"); \
|
|
printf("This program is free software; you can redistribute it and/or\n");\
|
|
printf("modify it under the terms of the GNU General Public License\n");\
|
|
printf("as published by the Free Software Foundation; either version 2,\n");\
|
|
printf("or (at your option) any later version.\n\n");\
|
|
printf("This program is distributed in the hope that it will be useful,\n");\
|
|
printf("but WITHOUT ANY WARRANTY; without even the implied warranty of\n");\
|
|
printf("MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n");\
|
|
printf("GNU General Public License for more details.\n");
|
|
int main(int argc, char *argv[])
|
|
{
|
|
squashfs_super_block sBlk;
|
|
char *dest = "squashfs-root";
|
|
int i, version = FALSE;
|
|
|
|
for(i = 1; i < argc; i++) {
|
|
if(*argv[i] != '-')
|
|
break;
|
|
if(strcmp(argv[i], "-version") == 0) {
|
|
VERSION();
|
|
version = TRUE;
|
|
} else if(strcmp(argv[i], "-info") == 0)
|
|
info = TRUE;
|
|
else if(strcmp(argv[i], "-ls") == 0)
|
|
lsonly = TRUE;
|
|
else if(strcmp(argv[i], "-dest") == 0) {
|
|
if(++i == argc)
|
|
goto options;
|
|
dest = argv[i];
|
|
}
|
|
}
|
|
|
|
if(i == argc) {
|
|
if(!version) {
|
|
options:
|
|
ERROR("SYNTAX: %s [-ls | -dest] filesystem\n", argv[0]);
|
|
ERROR("\t-version\t\tprint version, licence and copyright information\n");
|
|
ERROR("\t-info\t\t\tprint files as they are unsquashed\n");
|
|
ERROR("\t-ls\t\t\tlist filesystem only\n");
|
|
ERROR("\t-dest <pathname>\tunsquash to <pathname>, default \"squashfs-root\"\n");
|
|
}
|
|
exit(1);
|
|
}
|
|
|
|
if((fd = open(argv[i], O_RDONLY)) == -1) {
|
|
ERROR("Could not open %s, because %s\n", argv[i], strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
if(read_super(&sBlk, argv[i]) == FALSE)
|
|
exit(1);
|
|
|
|
block_size = sBlk.block_size;
|
|
if((fragment_data = malloc(block_size)) == NULL)
|
|
EXIT_UNSQUASH("failed to allocate fragment_data\n");
|
|
|
|
if((file_data = malloc(block_size)) == NULL)
|
|
EXIT_UNSQUASH("failed to allocate file_data");
|
|
|
|
if((data = malloc(block_size)) == NULL)
|
|
EXIT_UNSQUASH("failed to allocate datan\n");
|
|
|
|
if((created_inode = malloc(sBlk.inodes * sizeof(char *))) == NULL)
|
|
EXIT_UNSQUASH("failed to allocate created_inode\n");
|
|
|
|
memset(created_inode, 0, sBlk.inodes * sizeof(char *));
|
|
|
|
read_uids_guids(&sBlk);
|
|
read_fragment_table(&sBlk);
|
|
uncompress_inode_table(sBlk.inode_table_start, sBlk.directory_table_start, &sBlk);
|
|
uncompress_directory_table(sBlk.directory_table_start, sBlk.fragment_table_start, &sBlk);
|
|
|
|
dir_scan(dest, SQUASHFS_INODE_BLK(sBlk.root_inode), SQUASHFS_INODE_OFFSET(sBlk.root_inode), &sBlk);
|
|
|
|
if(!lsonly) {
|
|
printf("\n");
|
|
printf("created %d files\n", file_count);
|
|
printf("created %d directories\n", dir_count);
|
|
printf("created %d symlinks\n", sym_count);
|
|
printf("created %d devices\n", dev_count);
|
|
printf("created %d fifos\n", fifo_count);
|
|
}
|
|
|
|
}
|