#!/bin/bash
#------------ Port Pinger -----------
# Name:		pping
# Purpose:	Pings ports of hosts by sending SYN packets and waiting fro an answer
# Syntax1:	pping HostAddr PortNr 
# Syntax2:	pping NetAddr/CIDRNetmask PortNr 
# Author:	Michel Bisson (www.linuxint.net)
# Date:		04.10.2004
#		20.02.2005	Change the order of the arguments
# Note:		Needs to be ROOT and uses nmap port scanner program
#------------------------------------
#----------- Allow only 2 arguments. No more no less.
if [ "$#" -ne 2 ] ; then
    echo "ERROR: Bad number of arguments. Must be 2 arguments"
    echo "Syntax: pping HostAddr PortNr     or   pping NetAddr/CIDRNetmask PortNr "
    exit 1
fi
#----------- Allow only numeric Port Number --------------------


#----- Use the numeric port number or find the port number in /etc/services
if ! ( echo $2 | egrep "^[0-9]{1,5}$" &>/dev/null ) ; then
    port=$(expand /etc/services | grep "^$2 .*/tcp" | awk '{ print $2 }' | cut -d/ -f1)
    if [ ! "$port" ] ; then
	echo "ERROR: Bad port number"
	echo "Syntax: pping HostAddr PortNr     or   pping NetAddr/CIDRNetmask PortNr "
	exit 1
    fi
else
    port=$2
fi

#------

if (echo $2 | grep "/" &>/dev/null) ; then
    # -------- Filter the result so that I get only one line per Host
    result=$(nmap -n --host_timeout 210 --max_rtt_timeout 210 -p $port -P0 $1 | egrep "Interesting|open" | sed 's/$/#/')
    IFS="#"
    for i in $result ; do
	if (echo $i | grep "Interesting" &>/dev/null) ; then
	    IP=$(echo -n $i | awk '{ printf $4 }') 
	else
	    echo  -n $i : $IP | sed -e 's/    open       //' -e 's/:$//'
	fi
    done
else
    # ------------ Show the result of the host poking on that port ------- 
    nmap -n --host_timeout 210 --max_rtt_timeout 210 -p $port -P0 $1 | grep "open" | sed -e 's/    open       //'
fi
echo