objdump dump shellcode from a function of a binary file. Better used with gcc -static -fPIC to compile your C src

dumpshellcode.sh

#!/bin/bash

# linux only! if on osx, use gpaste and gsed instead of paste and sed

if (( $# != 2 )); then
    echo "Usage: $0 <file> <function>"
    exit 1
fi

#set -x

FILE=$1
FUNC=$2

echo "disasm:" >2
objdump -d $FILE | awk -v RS= '/^[[:xdigit:]]+ <'$FUNC'>/' 1>&2

objdump -d $FILE | awk -v RS= '/^[[:xdigit:]]+ <'$FUNC'>/' | grep '[0-9a-f]:'|grep -v 'file'|cut -f2 -d:|cut -f1-6 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/ /\\x/g'|paste -d '' -s |sed 's/^/"/'|sed 's/$/"/g'