mutew

#!/usr/bin/perl
use strict;
use warnings;
## Scan a 24bit CIDR network for pingable hosts

use 5.10.0;
use Net::Ping;

my $ipRange  = shift or die "Usage: pingrng <IP Address>\n";
my @ipSubset = split /\./, $ipRange;

#Verify IP Address range
for (@ipSubset) {
    die "Invalid IP adress - $ipRange\n"
      if not $_ || ($_ < 0 || $_ > 255);
}

my $kidpid;
for (1 .. 254) {
    my $currIP = join ".", (@ipSubset[0,1,2], $_);

    die "Could not fork()\n" unless defined ($kidpid = fork);
    if ($kidpid) {
        #Parent process
        waitpid($kidpid, 0);
    }
    else {
        #Child process
        my $pingConn = Net::Ping->new();    #TCP
        say "$currIP up" if $pingConn->ping($currIP);
        $pingConn->close();

        #Nothing else to do
        exit;
    }
}

say "Finished scanning $ipRange/24";