#!/bin/sh

# convert IP addres to HEX value
# For example : 10.0.0 - 0a0000
# This will generate a link at $TFTPFOLDER/0a0000 
# to default to load ERPXE faster for your IP/Subnet
# as Syslinux searching for this file before calling default.
# c0a800 (192.168.0.*) / 0a0000 (10.0.0.*) supplied by ERPXE as default
# links supplied by default for 192.168.*.* / 192.*.*.* and 10.0.*.* / 10.*.*.* also.
# Tested on: CentOS 6.4

# TODO
# 1. Check for valid input.

# TFTP Folder
TFTPFOLDER=/tftpboot/pxelinux.cfg

echo "Please input SUBNET or IP, for example 10.0.0"
read IP_ADDR

# Convert values to Hex
filename=$(printf '%02X' ${IP_ADDR//./ })

# Check If File Exist
cd $TFTPFOLDER/
if [ -f $filename ];
then
   echo "File $filename already exists."
else
    while true; do
        read -p "File $filename will be created. are you sure?" yn
        case $yn in
            [Yy]* ) ln -s $TFTPFOLDER/default $TFTPFOLDER/$filename; break;;
            [Nn]* ) echo "User aborted."; exit;;
            * ) echo "Please answer yes or no.";;
        esac
    done 
fi