Here is a small perl script to check if your site is under DDOS attack. I use this script to check our web server for certain attacks.

#!/usr/bin/perl

%ip_add=();

@list=`netstat -an |grep :80 |grep EST |awk ‘{print \$5}’ |awk -F: ‘{print \$1}’`;

foreach $line(@list) {
chomp($line);
$ip_add{$line}++;
}

$total=0;
foreach $line2(keys (%ip)) {
$total+=$ip{$line2};
print “$line2=$ip{$line2}\n”;
}
print “total=$total\n”;

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