#!/usr/bin/perl  -w
use String::Util 'trim';

=head1 NAME

ping_linux.pl - This script works on Linux system  pings a host and returns statistics data.

=head1 VERSION

Version 1.0

=head1 AUTHOR

Gaurav Dubey (gaurav.d@ronankiinfotech.com

=head1 SYNOPSIS

  ./ping_linux.pl [-c --> count (Number of echo requests to be sent)] [-i --> interval (Interval in milliseconds between echo  requests)] [-s --> packetsize (Size of icmp packet)] [-h --> destinationIP (Ip address of destination host)] [-w --> AllowableTime (Max time in seconds for sending receiving echo requests/reponse)]"

=head1 DESCRIPTION

This pings a host via the system ping command and returns RTA ,Tx packets,Rx packets,TTL,Packet-loss

=cut

use strict;

use Getopt::Long;
use Pod::Usage;

my ($host,$count,$interval,$packetsize,$allowableTime);
GetOptions(
	"h|host=s",    \$host,
	"c|count=i",    \$count,
	"i|interval=i",     \$interval,
	"s|packetsize=i", \$packetsize,
	"w|allowableTime=i",\$allowableTime,
);

#pod2usage("$0: No host given!\n") unless($host);
pod2usage("$0:No host given!\n") unless($host && $host =~ /^((([2][5][0-5]|([2][0-4]|[1][0-9]|[0-9])?[0-9])\.){3})([2][5][0-5]|([2][0-4]|[1][0-9]|[0-9])?[0-9])$/);
$count = 5 unless ($count);
$interval = 1 unless ($interval);
$packetsize = 56 unless ($packetsize);
$allowableTime = 1 unless ($allowableTime);

#Here I am opening a ping process on linux system .
open CMD, "/bin/ping -c $count -i $interval -s $packetsize -w $allowableTime $host |" or die "Can't open ping: $!";

#This code has been working fine by executing "./ping_linux.pl -h 192.168.1.150 -c 1" from terminal.And I want to mention it that this host is up and running with in our network.
my (@values1,@val1,@values2,@val2,@values3,@values4,@values5); 
 while (<CMD>) {
#In below, if-block I am extracting the host-ip,Packet Size,Packet+Header Size from the output line 
#PING 192.168.1.150 (192.168.1.150) 56(84) bytes of data

        if ( $_ =~ /PING/ ){
           @values1 = split ;
          @val1 = split(/\(/,$values1[3]); 
         $val1[1] =~ s/\)//;
           }  
#Below if-block has been used to extract the TTL values from the line "64 bytes from 192.168.1.150: icmp_req=1 ttl=254 time=4.43 ms"
#which is 254
    
      if ($. == 2) {
        @values2 = split;
          @val2 = split(/\=/ , $values2[5]);
           }
#in this if-block I am extracting the transfer-recieved packets and packet loss ,from the output line "3 packets transmitted, 3 received, 0% packet loss, time 2003ms"
      if ($_ =~ /packets/) {
          #print "$_ ";
         @values3 = split;
          }
#In last if-block I am extracting the rtt avg/max/min/med values ,from the output-line "rtt min/avg/max/mdev = 2.113/2.895/4.434/1.089 ms"
      if ($_ =~ /^rtt/) {
           #print "$_ ";
        @values4 = split /\=/;
         @values5 = split(/\// ,$values4[1]);
        }
   }



#print "$values1[1] \n";
 #   print "$val1[0] \n";
 #print "$val1[1] \n";
#print "$val2[1] \n";
#print "$values3[0] \n";
#print "$values3[3] \n";
#print "$values3[5] \n";
#print "$values4[1]";
#my $min = trim($values5[0]); 
#print "$min\n";
#print "$values5[1] \n";
#print "$values5[2] \n";
#print "$values5[3] ";

close CMD