93 lines
1.9 KiB
Plaintext
93 lines
1.9 KiB
Plaintext
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#!/bin/sh
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# extracts .config info from a [b]zImage file
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# uses: binoffset (new), dd, zcat, strings, grep
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# $arg1 is [b]zImage filename
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binoffset="./scripts/binoffset"
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test -e $binoffset || cc -o $binoffset ./scripts/binoffset.c || exit 1
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IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
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IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
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dump_config() {
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file="$1"
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start=`$binoffset $file $IKCFG_ST 2>/dev/null`
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[ "$?" != "0" ] && start="-1"
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if [ "$start" -eq "-1" ]; then
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return
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fi
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end=`$binoffset $file $IKCFG_ED 2>/dev/null`
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[ "$?" != "0" ] && end="-1"
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if [ "$end" -eq "-1" ]; then
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return
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fi
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start=`expr $start + 8`
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size=`expr $end - $start`
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dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | zcat
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clean_up
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exit 0
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}
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usage()
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{
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echo " usage: extract-ikconfig [b]zImage_filename"
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}
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clean_up()
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{
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if [ "$TMPFILE" != "" ]; then
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rm -f $TMPFILE
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fi
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}
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if [ $# -lt 1 ]
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then
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usage
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exit 1
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fi
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TMPFILE=`mktemp -t ikconfig-XXXXXX` || exit 1
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image="$1"
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# vmlinux: Attempt to dump the configuration from the file directly
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dump_config "$image"
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GZHDR1="0x1f 0x8b 0x08 0x00"
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GZHDR2="0x1f 0x8b 0x08 0x08"
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ELFHDR="0x7f 0x45 0x4c 0x46"
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# vmlinux.gz: Check for a compressed images
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off=`$binoffset "$image" $GZHDR1 2>/dev/null`
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[ "$?" != "0" ] && off="-1"
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if [ "$off" -eq "-1" ]; then
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off=`$binoffset "$image" $GZHDR2 2>/dev/null`
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[ "$?" != "0" ] && off="-1"
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fi
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if [ "$off" -eq "0" ]; then
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zcat <"$image" >"$TMPFILE"
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dump_config "$TMPFILE"
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elif [ "$off" -ne "-1" ]; then
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(dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \
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zcat >"$TMPFILE"
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dump_config "$TMPFILE"
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# check if this is simply an ELF file
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else
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off=`$binoffset "$image" $ELFHDR 2>/dev/null`
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[ "$?" != "0" ] && off="-1"
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if [ "$off" -eq "0" ]; then
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dump_config "$image"
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fi
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fi
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echo "ERROR: Unable to extract kernel configuration information."
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echo " This kernel image may not have the config info."
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clean_up
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exit 1
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