Shellcode C Harness

helper.sh

#!/bin/bash

if [ $# -ne 1 ]; then
    echo "{$0} <program to dump as shellcode>" 
    exit 1
fi

# https://www.commandlinefu.com/commands/view/6051/get-all-shellcode-on-binary-file-from-objdump
objdump -d ./${1}|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'

shellcode-harness.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

unsigned char code[] = \
"SHELLCODE: ";

int main() {
  printf("Shellcode Length: %d\n", strlen(code));
  int (*ret)() = (int(*)())code;
  ret()
}