senderbase.org nagios plugin via PHP CLI. ./senderbase <ipaddress>

senderbase.php

#!/usr/bin/php
<?php

# Senderbase Monitoring Plugin for Nagios
# Dan Miller <[email protected]>

error_reporting(E_ERROR | E_PARSE);

# Function to swap the octets of an IP...
# ..address around in to ARPA formatting.
function ipToArpa($address) {
        $raw = explode(".", $address);
        return "{$raw[3]}.{$raw[2]}.{$raw[1]}.{$raw[0]}";
}

$ip = $argv[1]; # IP address argument
$ar = ipToArpa($ip); # Convert the IP to ARPA formatting
$server = "rf.senderbase.org"; # What we append to the end of our query

# Let's check whether the IP address is valid.
$check = filter_var($ip, FILTER_VALIDATE_IP);
if(!$check) {
        die("[ERROR] No IP address given\n");
}

$result = dns_get_record("{$ar}.{$server}", DNS_TXT); # Init query.

$reputation = $result[0]['entries'][0]; # Reputation score

# If the array returns nothing, just die.
if($reputation == "") {
        echo "[ERROR] No results given\n";
        exit(0); # Exit with an OK for now, as not to clog up nagios.
}

echo "REPUTATION STATUS: ";

# Check against the results we've received.
if($reputation > 0) {
        echo "GOOD ({$reputation})\n";
        exit(0); # OK
} elseif($reputation >= -0.1) {
        echo "NEUTRAL ({$reputation})\n";
        exit(0); # OK
} elseif($reputation < 0) {
        echo "POOR ({$reputation})\n";
        exit(1); #WARNING
} else {
        echo "UNKNOWN ({$reputation})\n";
        exit(3); # UNKNOWN
        # We should never get to this state, just in case we do...
}
?>