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/*
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* Inspired by libvolume_id by
* Kay Sievers <kay.sievers@vrfy.org>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include "bitops.h" /* swab16() */
#include "superblocks.h"
#include <libubox/md5.h>
struct squashfs_super_block {
uint32_t s_magic;
uint32_t inodes;
uint32_t mkfs_time;
uint32_t block_size;
uint32_t fragments;
uint16_t compression;
uint16_t block_log;
uint16_t flags;
uint16_t no_ids;
uint16_t s_major;
uint16_t s_minor;
uint64_t root_inode;
uint64_t bytes_used;
uint64_t id_table_start;
uint64_t xattr_id_table_start;
uint64_t inode_table_start;
uint64_t directory_table_start;
uint64_t fragment_table_start;
uint64_t lookup_table_start;
} __attribute__((packed));
static int probe_squashfs(blkid_probe pr, const struct blkid_idmag *mag)
{
md5_ctx_t ctx = { 0 };
uint32_t md5[4];
struct squashfs_super_block *sq;
sq = blkid_probe_get_sb(pr, mag, struct squashfs_super_block);
if (!sq)
return -1;
if (strcmp(mag->magic, "sqsh") == 0 ||
strcmp(mag->magic, "qshs") == 0)
blkid_probe_sprintf_version(pr, "%u.%u",
be16_to_cpu(sq->s_major),
be16_to_cpu(sq->s_minor));
else
blkid_probe_sprintf_version(pr, "%u.%u",
le16_to_cpu(sq->s_major),
le16_to_cpu(sq->s_minor));
md5_begin(&ctx);
md5_hash(sq, sizeof(*sq), &ctx);
md5_end(&md5, &ctx);
blkid_probe_sprintf_uuid(pr, NULL, 4, "%08x-%08x-%08x-%08x",
md5[3], md5[2], md5[1], md5[0]);
return 0;
}
const struct blkid_idinfo squashfs_idinfo =
{
.name = "squashfs",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_squashfs,
.magics =
{
{ .magic = "sqsh", .len = 4 }, /* BE legacy squashfs */
{ .magic = "hsqs", .len = 4 }, /* LE / v4 squashfs */
/* LZMA version */
{ .magic = "qshs", .len = 4 }, /* BE legacy squashfs with LZMA */
{ .magic = "shsq", .len = 4 }, /* LE / v4 squashfs with LZMA */
{ NULL }
}
};
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