#!/bin/bash

IP=$1

check()
{
    A=`echo $IP | cut -f1 -d.`
    B=`echo $IP | cut -f2 -d.`
    C=`echo $IP | cut -f3 -d.`
    D=`echo $IP | cut -f4 -d.`

    if [ "$A" -lt "1" -o "$A" -gt "255" ] || [ "$B" -lt "0" -o "$B" -gt "255" ] || [ "$C" -lt "0" -o "$C" -gt "255" ] || [ "$D" -lt "0" -o "$D" -gt "255" ]; then
        exit 1
    fi
}

case $1 in
    *[^0-9.]*) exit 1 ;;
    *.*.*.*.*) exit 1 ;;
    [0-9]*.[0-9]*.[0-9]*.[0-9]*) check ;;
    *) exit 1 ;;
esac

exit 0