1 #!/bin/sh 1 #!/bin/sh
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 !! 5
6 # !! 6 binoffset="./scripts/binoffset"
7 # The obscure use of the "tr" filter is to wor !! 7 test -e $binoffset || cc -o $binoffset ./scripts/binoffset.c || exit 1
8 # "grep" that report the byte offset of the li !! 8
9 # !! 9 IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
10 # (c) 2009,2010 Dick Streefland <dick@streeflan !! 10 IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
11 # Licensed under the terms of the GNU General !! 11 dump_config() {
12 # -------------------------------------------- !! 12 file="$1"
>> 13
>> 14 start=`$binoffset $file $IKCFG_ST 2>/dev/null`
>> 15 [ "$?" != "0" ] && start="-1"
>> 16 if [ "$start" -eq "-1" ]; then
>> 17 return
>> 18 fi
>> 19 end=`$binoffset $file $IKCFG_ED 2>/dev/null`
>> 20 [ "$?" != "0" ] && end="-1"
>> 21 if [ "$end" -eq "-1" ]; then
>> 22 return
>> 23 fi
13 24
14 cf1='IKCFG_ST\037\213\010' !! 25 start=`expr $start + 8`
15 cf2='0123456789' !! 26 size=`expr $end - $start`
16 27
17 dump_config() !! 28 dd if="$file" ibs=1 skip="$start" count="$size" 2>/dev/null | zcat
>> 29
>> 30 clean_up
>> 31 exit 0
>> 32 }
>> 33
>> 34
>> 35 usage()
18 { 36 {
19 if pos=`tr "$cf1\n$cf2" "\n$cf2=" !! 37 echo " usage: extract-ikconfig [b]zImage_filename"
20 then <<
21 pos=${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 } 38 }
30 39
31 try_decompress() !! 40 clean_up()
32 { 41 {
33 for pos in `tr "$1\n$2" "\n$2=" < !! 42 if [ "$TMPFILE" != "" ]; then
34 do !! 43 rm -f $TMPFILE
35 pos=${pos%%:*} !! 44 fi
36 tail -c+$pos "$img" | $3 > $tm <<
37 dump_config $tmp2 <<
38 done <<
39 } 45 }
40 46
41 # Check invocation: !! 47 if [ $# -lt 1 ]
42 me=${0##*/} <<
43 img=$1 <<
44 if [ $# -ne 1 -o ! -s "$img" ] <<
45 then 48 then
46 echo "Usage: $me <kernel-image>" >&2 !! 49 usage
47 exit 2 !! 50 exit 1
>> 51 fi
>> 52
>> 53 TMPFILE=`mktemp -t ikconfig-XXXXXX` || exit 1
>> 54 image="$1"
>> 55
>> 56 # vmlinux: Attempt to dump the configuration from the file directly
>> 57 dump_config "$image"
>> 58
>> 59 GZHDR1="0x1f 0x8b 0x08 0x00"
>> 60 GZHDR2="0x1f 0x8b 0x08 0x08"
>> 61
>> 62 ELFHDR="0x7f 0x45 0x4c 0x46"
>> 63
>> 64 # vmlinux.gz: Check for a compressed images
>> 65 off=`$binoffset "$image" $GZHDR1 2>/dev/null`
>> 66 [ "$?" != "0" ] && off="-1"
>> 67 if [ "$off" -eq "-1" ]; then
>> 68 off=`$binoffset "$image" $GZHDR2 2>/dev/null`
>> 69 [ "$?" != "0" ] && off="-1"
>> 70 fi
>> 71 if [ "$off" -eq "0" ]; then
>> 72 zcat <"$image" >"$TMPFILE"
>> 73 dump_config "$TMPFILE"
>> 74 elif [ "$off" -ne "-1" ]; then
>> 75 (dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \
>> 76 zcat >"$TMPFILE"
>> 77 dump_config "$TMPFILE"
>> 78
>> 79 # check if this is simply an ELF file
>> 80 else
>> 81 off=`$binoffset "$image" $ELFHDR 2>/dev/null`
>> 82 [ "$?" != "0" ] && off="-1"
>> 83 if [ "$off" -eq "0" ]; then
>> 84 dump_config "$image"
>> 85 fi
48 fi 86 fi
49 87
50 # Prepare temp files: !! 88 echo "ERROR: Unable to extract kernel configuration information."
51 tmp1=/tmp/ikconfig$$.1 !! 89 echo " This kernel image may not have the config info."
52 tmp2=/tmp/ikconfig$$.2 <<
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 90
67 # Bail out: !! 91 clean_up
68 echo "$me: Cannot find kernel config." >&2 <<
69 exit 1 92 exit 1
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