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32 results

extract-ikconfig

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  • extract-ikconfig 1.59 KiB
    #!/bin/sh
    # extracts .config info from a [b]zImage file
    # uses: binoffset (new), dd, zcat, strings, grep
    # $arg1 is [b]zImage filename
    
    binoffset="./scripts/binoffset"
    
    IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
    IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
    function dump_config {
        typeset file="$1"
    
        start=`$binoffset $file $IKCFG_ST 2>/dev/null`
        [ "$?" != "0" ] && start="-1"
        if [ "$start" -eq "-1" ]; then
    	return
        fi
        end=`$binoffset $file $IKCFG_ED 2>/dev/null`
    
        let start="$start + 8"
        let size="$end - $start"
    
        head --bytes="$end" "$file" | tail --bytes="$size" | zcat
    
        clean_up
        exit 0
    }
    
    
    usage()
    {
    	echo "  usage: extract-ikconfig [b]zImage_filename"
    }
    
    clean_up()
    {
    	if [ "$TMPFILE" != "" ]; then
    		rm -f $TMPFILE
    	fi
    }
    
    if [ $# -lt 1 ]
    then
    	usage
    	exit 1
    fi
    
    TMPFILE=`mktemp -t ikconfig-XXXXXX` || exit 1
    image="$1"
    
    # vmlinux: Attempt to dump the configuration from the file directly
    dump_config "$image"
    
    GZHDR1="0x1f 0x8b 0x08 0x00"
    GZHDR2="0x1f 0x8b 0x08 0x08"
    
    # vmlinux.gz: Check for a compressed images
    off=`$binoffset "$image" $GZHDR1 2>/dev/null`
    [ "$?" != "0" ] && off="-1"
    if [ "$off" -eq "-1" ]; then
    	off=`$binoffset "$image" $GZHDR2 2>/dev/null`
    	[ "$?" != "0" ] && off="-1"
    fi
    if [ "$off" -eq "0" ]; then
    	zcat <"$image" >"$TMPFILE"
    	dump_config "$TMPFILE"
    elif [ "$off" -ne "-1" ]; then
    	(dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \
    		zcat >"$TMPFILE"
    	dump_config "$TMPFILE"
    fi
    
    echo "ERROR: Unable to extract kernel configuration information."
    echo "       This kernel image may not have the config info."
    
    clean_up
    exit 1