/
unsquashfs-1.3.c
1410 lines (1164 loc) · 41.7 KB
/
unsquashfs-1.3.c
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/*
* Unsquash a squashfs filesystem. This is a highly compressed read only filesystem.
*
* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007
* Phillip Lougher <phillip@lougher.org.uk>
*
* 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,
* 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* unsquash.c
*/
#define CONFIG_SQUASHFS_2_0_COMPATIBILITY
#define TRUE 1
#define FALSE 0
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <zlib.h>
#include <sys/mman.h>
#include <utime.h>
#ifndef linux
#define __BYTE_ORDER BYTE_ORDER
#define __BIG_ENDIAN BIG_ENDIAN
#define __LITTLE_ENDIAN LITTLE_ENDIAN
#else
#include <endian.h>
#endif
#include <linux/squashfs_fs.h>
#include "read_fs.h"
#include "global.h"
#include "sqlzma.h"
#include "LzmaDec.h"
#include <stdlib.h>
#ifdef SQUASHFS_TRACE
#define TRACE(s, args...) do { \
printf("mksquashfs: "s, ## args); \
} while(0)
#else
#define TRACE(s, args...)
#endif
#define ERROR(s, args...) do { \
fprintf(stderr, s, ## args); \
} while(0)
#define EXIT_UNSQUASH(s, args...) do { \
fprintf(stderr, "FATAL ERROR aborting: "s, ## args); \
} while(0)
struct hash_table_entry {
int start;
int bytes;
struct hash_table_entry *next;
};
typedef struct squashfs_operations {
struct dir *(*squashfs_opendir)(unsigned int block_start, unsigned int offset);
char *(*read_fragment)(unsigned int fragment);
void (*read_fragment_table)();
int (*create_inode)(char *pathname, unsigned int start_block, unsigned int offset);
} squashfs_operations;
squashfs_super_block sBlk;
squashfs_operations s_ops;
int bytes = 0, swap, file_count = 0, dir_count = 0, sym_count = 0,
dev_count = 0, fifo_count = 0;
char *inode_table = NULL, *directory_table = NULL;
struct hash_table_entry *inode_table_hash[65536], *directory_table_hash[65536];
int fd;
squashfs_fragment_entry *fragment_table;
squashfs_fragment_entry_2 *fragment_table_2;
unsigned int *uid_table, *guid_table;
unsigned int cached_frag = SQUASHFS_INVALID_FRAG;
char *fragment_data;
char *file_data;
char *data;
unsigned int block_size;
int lsonly = FALSE, info = FALSE, force = FALSE;
char **created_inode;
int root_process;
#define CALCULATE_HASH(start) (start & 0xffff)
int add_entry(struct hash_table_entry *hash_table[], int start, int bytes)
{
int hash = CALCULATE_HASH(start);
struct hash_table_entry *hash_table_entry;
if((hash_table_entry = malloc(sizeof(struct hash_table_entry))) == NULL) {
ERROR("add_hash: out of memory in malloc\n");
return FALSE;
}
hash_table_entry->start = start;
hash_table_entry->bytes = bytes;
hash_table_entry->next = hash_table[hash];
hash_table[hash] = hash_table_entry;
return TRUE;
}
int lookup_entry(struct hash_table_entry *hash_table[], int start)
{
int hash = CALCULATE_HASH(start);
struct hash_table_entry *hash_table_entry;
for(hash_table_entry = hash_table[hash]; hash_table_entry;
hash_table_entry = hash_table_entry->next)
if(hash_table_entry->start == start)
return hash_table_entry->bytes;
return -1;
}
int read_bytes(long long byte, int bytes, char *buff)
{
off_t off = byte;
TRACE("read_bytes: reading from position 0x%llx, bytes %d\n", byte, bytes);
if(lseek(fd, off, SEEK_SET) == -1) {
ERROR("Lseek failed because %s\b", strerror(errno));
return FALSE;
}
if(read(fd, buff, bytes) == -1) {
ERROR("Read on destination failed because %s\n", strerror(errno));
return FALSE;
}
return TRUE;
}
int read_block(long long start, long long *next, char *block)
{
unsigned short c_byte;
int offset = 2;
if(swap) {
if(read_bytes(start, 2, block) == FALSE)
goto failed;
((unsigned char *) &c_byte)[1] = block[0];
((unsigned char *) &c_byte)[0] = block[1];
} else
if(read_bytes(start, 2, (char *)&c_byte) == FALSE)
goto failed;
TRACE("read_block: block @0x%llx, %d %s bytes\n", start, SQUASHFS_COMPRESSED_SIZE(c_byte), SQUASHFS_COMPRESSED(c_byte) ? "compressed" : "uncompressed");
if(SQUASHFS_CHECK_DATA(sBlk.flags))
offset = 3;
if(SQUASHFS_COMPRESSED(c_byte)) {
char buffer[SQUASHFS_METADATA_SIZE];
int res;
unsigned long bytes = SQUASHFS_METADATA_SIZE;
c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
if(read_bytes(start + offset, c_byte, buffer) == FALSE)
goto failed;
if (!is_lzma(buffer[0])) {
if((res = uncompress((unsigned char *) block, &bytes,
(const unsigned char *) buffer, c_byte)) != Z_OK) {
if(res == Z_MEM_ERROR)
ERROR("zlib::uncompress failed, not enough memory\n");
else if(res == Z_BUF_ERROR)
ERROR("zlib::uncompress failed, not enough room in output buffer\n");
else
ERROR("zlib::uncompress failed, unknown error %d\n", res);
goto failed;
}
}
else {
if((res = LzmaUncompress(block, &bytes, buffer, c_byte)) != SZ_OK)
ERROR("LzmaUncompress: error (%d)\n", res);
}
if(next)
*next = start + offset + c_byte;
return bytes;
} else {
c_byte = SQUASHFS_COMPRESSED_SIZE(c_byte);
if(read_bytes(start + offset, c_byte, block) == FALSE)
goto failed;
if(next)
*next = start + offset + c_byte;
return c_byte;
}
failed:
return FALSE;
}
int read_data_block(long long start, unsigned int size, char *block)
{
int res;
unsigned long bytes = block_size;
int c_byte = SQUASHFS_COMPRESSED_SIZE_BLOCK(size);
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");
if(SQUASHFS_COMPRESSED_BLOCK(size)) {
if(read_bytes(start, c_byte, data) == FALSE)
return 0;
if (!is_lzma(data[0])) {
if((res = uncompress((unsigned char *) block, &bytes,
(const unsigned char *) data, c_byte)) != Z_OK) {
if(res == Z_MEM_ERROR)
ERROR("zlib::uncompress failed, not enough memory\n");
else if(res == Z_BUF_ERROR)
ERROR("zlib::uncompress failed, not enough room in output buffer\n");
else
ERROR("zlib::uncompress failed, unknown error %d\n", res);
return 0;
}
}
/* LZMA */
else {
if((res = LzmaUncompress(block, &bytes, data, c_byte)) != SZ_OK)
ERROR("LzmaUncompress: error (%d)\n", res);
}
return bytes;
} else {
if(read_bytes(start, c_byte, block) == FALSE)
return 0;
return c_byte;
}
}
void uncompress_inode_table(long long start, long long end)
{
int size = 0, bytes = 0, res;
while(start < end) {
if((size - bytes < SQUASHFS_METADATA_SIZE) &&
((inode_table = realloc(inode_table, size +=
SQUASHFS_METADATA_SIZE)) == NULL))
EXIT_UNSQUASH("uncompress_inode_table: out of memory in realloc\n");
TRACE("uncompress_inode_table: reading block 0x%llx\n", start);
add_entry(inode_table_hash, start, bytes);
if((res = read_block(start, &start, inode_table + bytes)) == 0) {
free(inode_table);
EXIT_UNSQUASH("uncompress_inode_table: failed to read block\n");
}
bytes += res;
}
}
int set_attributes(char *pathname, unsigned int mode, unsigned int uid,
unsigned int guid, unsigned int mtime, unsigned int set_mode)
{
struct utimbuf times = { (time_t) mtime, (time_t) mtime };
if(utime(pathname, ×) == -1) {
ERROR("set_attributes: failed to set time on %s, because %s\n", pathname, strerror(errno));
return FALSE;
}
if(root_process) {
uid_t uid_value = (uid_t) uid_table[uid];
uid_t guid_value = guid == SQUASHFS_GUIDS ? uid_value : (uid_t) guid_table[guid];
if(chown(pathname, uid_value, guid_value) == -1) {
ERROR("set_attributes: failed to change uid and gids on %s, because %s\n", pathname, strerror(errno));
return FALSE;
}
} else
mode &= ~07000;
if((set_mode || (mode & 07000)) && chmod(pathname, (mode_t) mode) == -1) {
ERROR("set_attributes: failed to change mode %s, because %s\n", pathname, strerror(errno));
return FALSE;
}
return TRUE;
}
void read_uids_guids()
{
if((uid_table = malloc((sBlk.no_uids + sBlk.no_guids) * sizeof(unsigned int))) == NULL)
EXIT_UNSQUASH("read_uids_guids: failed to allocate uid/gid table\n");
guid_table = uid_table + sBlk.no_uids;
if(swap) {
unsigned int suid_table[sBlk.no_uids + sBlk.no_guids];
if(read_bytes(sBlk.uid_start, (sBlk.no_uids + sBlk.no_guids)
* sizeof(unsigned int), (char *) suid_table) ==
FALSE)
EXIT_UNSQUASH("read_uids_guids: failed to read uid/gid table\n");
SQUASHFS_SWAP_INTS(uid_table, suid_table, sBlk.no_uids + sBlk.no_guids);
} else
if(read_bytes(sBlk.uid_start, (sBlk.no_uids + sBlk.no_guids)
* sizeof(unsigned int), (char *) uid_table) ==
FALSE)
EXIT_UNSQUASH("read_uids_guids: failed to read uid/gid table\n");
}
void read_fragment_table()
{
int i, indexes = SQUASHFS_FRAGMENT_INDEXES(sBlk.fragments);
squashfs_fragment_index fragment_table_index[indexes];
TRACE("read_fragment_table: %d fragments, reading %d fragment indexes from 0x%llx\n", sBlk.fragments, indexes, sBlk.fragment_table_start);
if(sBlk.fragments == 0)
return;
if((fragment_table = (squashfs_fragment_entry *)
malloc(sBlk.fragments *
sizeof(squashfs_fragment_entry))) == NULL)
EXIT_UNSQUASH("read_fragment_table: failed to allocate fragment table\n");
if(swap) {
squashfs_fragment_index sfragment_table_index[indexes];
read_bytes(sBlk.fragment_table_start, SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk.fragments), (char *) sfragment_table_index);
SQUASHFS_SWAP_FRAGMENT_INDEXES(fragment_table_index, sfragment_table_index, indexes);
} else
read_bytes(sBlk.fragment_table_start, SQUASHFS_FRAGMENT_INDEX_BYTES(sBlk.fragments), (char *) fragment_table_index);
for(i = 0; i < indexes; i++) {
int length = read_block(fragment_table_index[i], NULL,
((char *) fragment_table) + (i * SQUASHFS_METADATA_SIZE));
TRACE("Read fragment table block %d, from 0x%llx, length %d\n", i, fragment_table_index[i], length);
}
if(swap) {
squashfs_fragment_entry sfragment;
for(i = 0; i < sBlk.fragments; i++) {
SQUASHFS_SWAP_FRAGMENT_ENTRY((&sfragment), (&fragment_table[i]));
memcpy((char *) &fragment_table[i], (char *) &sfragment, sizeof(squashfs_fragment_entry));
}
}
}
void read_fragment_table_2()
{
int i, indexes = SQUASHFS_FRAGMENT_INDEXES_2(sBlk.fragments);
unsigned int fragment_table_index[indexes];
TRACE("read_fragment_table: %d fragments, reading %d fragment indexes from 0x%llx\n", sBlk.fragments, indexes, sBlk.fragment_table_start);
if(sBlk.fragments == 0)
return;
if((fragment_table_2 = (squashfs_fragment_entry_2 *)
malloc(sBlk.fragments *
sizeof(squashfs_fragment_entry))) == NULL)
EXIT_UNSQUASH("read_fragment_table: failed to allocate fragment table\n");
if(swap) {
unsigned int sfragment_table_index[indexes];
read_bytes(sBlk.fragment_table_start, SQUASHFS_FRAGMENT_INDEX_BYTES_2(sBlk.fragments), (char *) sfragment_table_index);
SQUASHFS_SWAP_FRAGMENT_INDEXES_2(fragment_table_index, sfragment_table_index, indexes);
} else
read_bytes(sBlk.fragment_table_start, SQUASHFS_FRAGMENT_INDEX_BYTES_2(sBlk.fragments), (char *) fragment_table_index);
for(i = 0; i < indexes; i++) {
int length = read_block(fragment_table_index[i], NULL,
((char *) fragment_table_2) + (i * SQUASHFS_METADATA_SIZE));
TRACE("Read fragment table block %d, from 0x%llx, length %d\n", i, fragment_table_index[i], length);
}
if(swap) {
squashfs_fragment_entry_2 sfragment;
for(i = 0; i < sBlk.fragments; i++) {
SQUASHFS_SWAP_FRAGMENT_ENTRY_2((&sfragment), (&fragment_table_2[i]));
memcpy((char *) &fragment_table_2[i], (char *) &sfragment, sizeof(squashfs_fragment_entry_2));
}
}
}
char *read_fragment(unsigned int fragment)
{
TRACE("read_fragment: reading fragment %d\n", fragment);
if(cached_frag == SQUASHFS_INVALID_FRAG || fragment != cached_frag) {
squashfs_fragment_entry *fragment_entry = &fragment_table[fragment];
if(read_data_block(fragment_entry->start_block, fragment_entry->size, fragment_data) == 0) {
ERROR("read_fragment: failed to read fragment %d\n", fragment);
cached_frag = SQUASHFS_INVALID_FRAG;
return NULL;
}
cached_frag = fragment;
}
return fragment_data;
}
char *read_fragment_2(unsigned int fragment)
{
TRACE("read_fragment: reading fragment %d\n", fragment);
if(cached_frag == SQUASHFS_INVALID_FRAG || fragment != cached_frag) {
squashfs_fragment_entry_2 *fragment_entry = &fragment_table_2[fragment];
if(read_data_block(fragment_entry->start_block, fragment_entry->size, fragment_data) == 0) {
ERROR("read_fragment: failed to read fragment %d\n", fragment);
cached_frag = SQUASHFS_INVALID_FRAG;
return NULL;
}
cached_frag = fragment;
}
return fragment_data;
}
int write_file(char *pathname, unsigned int fragment, unsigned int frag_bytes,
unsigned int offset, unsigned int blocks, long long start, char *block_ptr,
unsigned int mode)
{
unsigned int file_fd, bytes, i;
unsigned int *block_list;
TRACE("write_file: regular file, blocks %d\n", blocks);
if((block_list = malloc(blocks * sizeof(unsigned int))) == NULL) {
ERROR("write_file: unable to malloc block list\n");
return FALSE;
}
if(swap) {
unsigned int sblock_list[blocks];
memcpy(sblock_list, block_ptr, blocks * sizeof(unsigned int));
SQUASHFS_SWAP_INTS(block_list, sblock_list, blocks);
} else
memcpy(block_list, block_ptr, blocks * sizeof(unsigned int));
if((file_fd = open(pathname, O_CREAT | O_WRONLY | (force ? O_TRUNC : 0), (mode_t) mode & 0777)) == -1) {
ERROR("write_file: failed to create file %s, because %s\n", pathname,
strerror(errno));
free(block_list);
return FALSE;
}
for(i = 0; i < blocks; i++) {
if((bytes = read_data_block(start, block_list[i], file_data)) == 0) {
ERROR("write_file: failed to read data block 0x%llx\n", start);
goto failure;
}
if(write(file_fd, file_data, bytes) < bytes) {
ERROR("write_file: failed to write data block 0x%llx\n", start);
goto failure;
}
start += SQUASHFS_COMPRESSED_SIZE_BLOCK(block_list[i]);
}
if(frag_bytes != 0) {
char *fragment_data = s_ops.read_fragment(fragment);
if(fragment_data == NULL)
goto failure;
if(write(file_fd, fragment_data + offset, frag_bytes) < frag_bytes) {
ERROR("write_file: failed to write fragment %d\n", fragment);
goto failure;
}
}
close(file_fd);
return TRUE;
failure:
close(file_fd);
free(block_list);
return FALSE;
}
int create_inode(char *pathname, unsigned int start_block, unsigned int offset)
{
long long start = sBlk.inode_table_start + start_block;
squashfs_inode_header header;
char *block_ptr;
int bytes = lookup_entry(inode_table_hash, start), file_fd;
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(force)
unlink(pathname);
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, force);
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, force);
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(force)
unlink(pathname);
if(symlink(name, pathname) == -1) {
ERROR("create_inode: failed to create symlink %s, because %s\n", pathname,
strerror(errno));
break;
}
if(root_process) {
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(root_process) {
if(force)
unlink(pathname);
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! %s\n",
inodep->inode_type == SQUASHFS_CHRDEV_TYPE ? "character" : "block",
pathname, strerror(errno));
break;
}
case SQUASHFS_FIFO_TYPE:
TRACE("create_inode: fifo\n");
if(force)
unlink(pathname);
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;
}
int create_inode_2(char *pathname, unsigned int start_block, unsigned int offset)
{
long long start = sBlk.inode_table_start + start_block;
squashfs_inode_header_2 header;
char *block_ptr;
int bytes = lookup_entry(inode_table_hash, start), file_fd;
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_2 sinode;
memcpy(&sinode, block_ptr, sizeof(header.base));
SQUASHFS_SWAP_BASE_INODE_HEADER_2(&header.base, &sinode, sizeof(squashfs_base_inode_header_2));
} else
memcpy(&header.base, block_ptr, sizeof(header.base));
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_2 *inode = &header.reg;
if(swap) {
squashfs_reg_inode_header_2 sinode;
memcpy(&sinode, block_ptr, sizeof(sinode));
SQUASHFS_SWAP_REG_INODE_HEADER_2(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, force);
file_count ++;
}
break;
}
case SQUASHFS_SYMLINK_TYPE: {
squashfs_symlink_inode_header_2 *inodep = &header.symlink;
char name[65536];
if(swap) {
squashfs_symlink_inode_header_2 sinodep;
memcpy(&sinodep, block_ptr, sizeof(sinodep));
SQUASHFS_SWAP_SYMLINK_INODE_HEADER_2(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_2), inodep->symlink_size);
name[inodep->symlink_size] = '\0';
if(force)
unlink(pathname);
if(symlink(name, pathname) == -1) {
ERROR("create_inode: failed to create symlink %s, because %s\n", pathname,
strerror(errno));
break;
}
if(root_process) {
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_2 *inodep = &header.dev;
if(swap) {
squashfs_dev_inode_header_2 sinodep;
memcpy(&sinodep, block_ptr, sizeof(sinodep));
SQUASHFS_SWAP_DEV_INODE_HEADER_2(inodep, &sinodep);
} else
memcpy(inodep, block_ptr, sizeof(*inodep));
TRACE("create_inode: dev, rdev 0x%x\n", inodep->rdev);
if(root_process) {
if(force)
unlink(pathname);
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, sBlk.mkfs_time, TRUE);
dev_count ++;
} else
ERROR("create_inode: could not create %s device %s, because you're not superuser! %s\n",
inodep->inode_type == SQUASHFS_CHRDEV_TYPE ? "character" : "block",
pathname, strerror(errno));
break;
}
case SQUASHFS_FIFO_TYPE:
TRACE("create_inode: fifo\n");
if(force)
unlink(pathname);
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,
sBlk.mkfs_time, 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;
}
return TRUE;
}
void uncompress_directory_table(long long start, long long end)
{
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)) == 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_opendir(unsigned int block_start, unsigned int offset)
{
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);