1 #!/bin/sh !! 1 #! /bin/bash
2 # -------------------------------------------- !! 2 # extracts .config info from a [b]zImage file
3 # extract-ikconfig - Extract the .config file !! 3 # uses: binoffset (new), dd, zcat, strings, grep
4 # !! 4 # $arg1 is [b]zImage filename
5 # This will only work when the kernel was comp <<
6 # <<
7 # The obscure use of the "tr" filter is to wor <<
8 # "grep" that report the byte offset of the li <<
9 # <<
10 # (c) 2009,2010 Dick Streefland <dick@streeflan <<
11 # Licensed under the terms of the GNU General <<
12 # -------------------------------------------- <<
13 5
14 cf1='IKCFG_ST\037\213\010' !! 6 TMPFILE=""
15 cf2='0123456789' <<
16 7
17 dump_config() !! 8 usage()
18 { 9 {
19 if pos=`tr "$cf1\n$cf2" "\n$cf2=" !! 10 echo " usage: extract-ikconfig [b]zImage_filename"
20 then <<
21 pos=${pos%%:*} <<
22 tail -c+$(($pos+8)) "$1" | zca <<
23 if [ $? != 1 ] <<
24 then # exit status must be <<
25 cat $tmp1 <<
26 exit 0 <<
27 fi <<
28 fi <<
29 } 11 }
30 12
31 try_decompress() !! 13 clean_up()
32 { 14 {
33 for pos in `tr "$1\n$2" "\n$2=" < !! 15 if [ -z $ISCOMP ]
34 do !! 16 then
35 pos=${pos%%:*} !! 17 rm -f $TMPFILE
36 tail -c+$pos "$img" | $3 > $tm !! 18 fi
37 dump_config $tmp2 <<
38 done <<
39 } 19 }
40 20
41 # Check invocation: !! 21 if [ $# -lt 1 ]
42 me=${0##*/} !! 22 then
43 img=$1 !! 23 usage
44 if [ $# -ne 1 -o ! -s "$img" ] !! 24 exit
>> 25 fi
>> 26
>> 27 image=$1
>> 28
>> 29 # There are two gzip headers, as well as arches which don't compress their
>> 30 # kernel.
>> 31 GZHDR="0x1f 0x8b 0x08 0x00"
>> 32 if [ `binoffset $image $GZHDR >/dev/null 2>&1 ; echo $?` -ne 0 ]
>> 33 then
>> 34 GZHDR="0x1f 0x8b 0x08 0x08"
>> 35 if [ `binoffset $image $GZHDR >/dev/null 2>&1 ; echo $?` -ne 0 ]
>> 36 then
>> 37 ISCOMP=0
>> 38 fi
>> 39 fi
>> 40
>> 41 PID=$$
>> 42
>> 43 # Extract and uncompress the kernel image if necessary
>> 44 if [ -z $ISCOMP ]
>> 45 then
>> 46 TMPFILE="/tmp/`basename $image`.vmlin.$PID"
>> 47 dd if=$image bs=1 skip=`binoffset $image $GZHDR` 2> /dev/null | zcat > $TMPFILE
>> 48 else
>> 49 TMPFILE=$image
>> 50 fi
>> 51
>> 52 # Look for strings.
>> 53 strings $TMPFILE | grep "CONFIG_BEGIN=n" > /dev/null
>> 54 if [ $? -eq 0 ]
45 then 55 then
46 echo "Usage: $me <kernel-image>" >&2 !! 56 strings $TMPFILE | awk "/CONFIG_BEGIN=n/,/CONFIG_END=n/" > $image.oldconfig.$PID
47 exit 2 !! 57 else
>> 58 echo "ERROR: Unable to extract kernel configuration information."
>> 59 echo " This kernel image may not have the config info."
>> 60 clean_up
>> 61 exit 1
48 fi 62 fi
49 63
50 # Prepare temp files: !! 64 echo "Kernel configuration written to $image.oldconfig.$PID"
51 tmp1=/tmp/ikconfig$$.1 !! 65 clean_up
52 tmp2=/tmp/ikconfig$$.2 !! 66 exit 0
53 trap "rm -f $tmp1 $tmp2" 0 <<
54 <<
55 # Initial attempt for uncompressed images or o <<
56 dump_config "$img" <<
57 <<
58 # That didn't work, so retry after decompressi <<
59 try_decompress '\037\213\010' xy gunzip <<
60 try_decompress '\3757zXZ\000' abcde unxz <<
61 try_decompress 'BZh' xy bunzip2 <<
62 try_decompress '\135\0\0\0' xxx unlzma <<
63 try_decompress '\211\114\132' xy 'lzop -d' <<
64 try_decompress '\002\041\114\030' xyy 'lz4 -d <<
65 try_decompress '\050\265\057\375' xxx unzstd <<
66 <<
67 # Bail out: <<
68 echo "$me: Cannot find kernel config." >&2 <<
69 exit 1 <<
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