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- #!/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"
- test -e $binoffset || cc -o $binoffset ./scripts/binoffset.c || exit 1
-
- IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
- IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
- dump_config() {
- 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`
-
- start=`expr $start + 8`
- size=`expr $end - $start`
-
- dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | 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
-