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@aallan /counter.pl
Last active Feb 3, 2017

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Script uses an ARP scan to counter the number of devices on the network and saves this information to an SQLite3 database.
#!/usr/bin/env perl
#+
# Name:
# counter.pl
# Language:
# Perl
# Purpose:
# Count the number of devices on a network
# Description
# Script uses an ARP scan to count the number of devices on the network
# and saves this information to an SQLite3 database. Database will be created
# the first time the script is run, tables will be created on the fly when
# needed if they don't already exist.
# External Modules:
# Getopt::Long
# DBI
# DataTime
# Authors:
# ANA: Alasdair Allan (Babilim Light Industries, Ltd.)
# History
# 03-FEB-2017 (ANA):
# Added optional lookup of mDNS forward address of scanned hosts.
# 02-FEB-2017 (ANA):
# Original version of the script.
# Copyright:
# Copyright (C) 2017. Babilim Light Industries, Ltd. Released under the MIT License.
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
# to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
# BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#-
# L O A D M O D U L E S --------------------------------------------------
use strict;
use warnings;
use DBI;
use Getopt::Long;
use DateTime;
# O P T I O N S H A N D L I N G --------------------------------------------
my ( %opt );
my $status = GetOptions("network=s" => \$opt{"network"},
"dig" => \$opt{"dig"});
$opt{"network"} = "network" unless defined $opt{"network"};
# R U N S C A N -----------------------------------------------------------
print "\nSCANNING\n--------\n";
my ($stmt, $sth, $rv);
my $dbfile = "/home/pi/$opt{'network'}.db";
my $dbh = DBI->connect("dbi:SQLite:dbname=$dbfile","","");
my $scan = `arp-scan --retry=8 --ignoredups -I wlan0 --localnet`;
my @lines = split("\n", $scan);
my $csv = undef;
my $count = 0;
foreach my $line (@lines) {
chomp($line);
if ($line =~ /^\s*((?:\d{1,3}\.){3}\d{1,3})\s+((?:[a-fA-F0-9]{2}:){5}[a-fA-F0-9]{2})\s+(\S.*)/) {
my $ip = $1;
my $mac = $2;
my $desc = $3;
print "IP=$ip, MAC=$mac, DESC=$desc";
# Dig for the mDNS name associated with the IP
my $mdns = undef;
if (defined($opt{"dig"})) {
$stmt = qq(CREATE TABLE IF NOT EXISTS mdns(mac TEXT NOT NULL PRIMARY KEY UNIQUE, mdns TEXT););
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
my $dig = `dig -x ${ip} \@224.0.0.251 -p 5353`;
#print $dig;
my @report = split("\n", $dig);
my $answer = 0;
my $local = undef;
foreach my $entry (@report) {
chomp($entry);
if ( $answer == 1 ) {
$local = $entry;
last;
}
if( $entry eq ";; ANSWER SECTION:") {
$answer = 1;
}
}
if ( defined $local ) {
#print "local name = $local\n";
( $mdns ) = ($local =~ /\s+(\S+\.local)\.$/);
print ", LOCAL=$mdns\n";
$stmt = qq(INSERT OR REPLACE INTO mdns (mac, mdns) VALUES ("$mac","$mdns"));
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
} else {
print "\n";
}
} else {
print "\n";
}
$stmt = qq(CREATE TABLE IF NOT EXISTS macs(mac TEXT NOT NULL PRIMARY KEY UNIQUE, count INTEGER, description TEXT););
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
$stmt = qq(SELECT count FROM macs WHERE mac="$mac";);
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
my @row = $sth->fetchrow_array();
$sth->finish();
my $previous;
if (defined( $row[0] )) {
$previous = $row[0]
} else {
$previous = 0;
}
print "Previously seen '$previous' times\n";
$stmt = qq(INSERT OR REPLACE INTO macs (mac, count, description) VALUES ("$mac",$previous+1,"$desc"));
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
if (!defined $csv) {
$csv = "$mac";
} else {
$csv = $csv . ",$mac";
}
$count++;
}
}
my $time = DateTime->now->iso8601;
print "\nRESULT\n------\n";
print "time = $time\n";
print "count = $count\n";
print "csv = $csv\n";
$stmt = qq(CREATE TABLE IF NOT EXISTS scan(id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, datetime TEXT UNIQUE, count INTEGER, macs TEXT););
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
$stmt = qq(INSERT INTO scan (datetime, count, macs) VALUES ("$time",$count,"$csv"));
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
# L A S T O R D E R S -----------------------------------------------------
$stmt = qq(CREATE TABLE IF NOT EXISTS days(date TEXT UNIQUE NOT NULL PRIMARY KEY, average INTEGER, samples TEXT););
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
print "\nAVERAGE\n-------\n";
my $day = DateTime->now->ymd('-');
print "Today is $day\n";
$stmt = qq(SELECT samples FROM days WHERE date="$day";);
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
my @row = $sth->fetchrow_array();
$sth->finish();
my $samples;
if (defined( $row[0] )) {
$samples = $row[0];
} else {
$samples = undef;
}
my @values;
if (!defined $samples) {
$values[0] = $count;
$samples = "$count";
} else {
@values = split(',', $samples);
push (@values, $count);
$samples = $samples . ",$count";
}
print "Samples = $samples\n";
#print "values = @values\n";
my $average = 0;
foreach my $value (@values) {
$average = $average + $value;
}
$average = int($average/scalar(@values));
$stmt = qq(INSERT OR REPLACE INTO days (date, average, samples) VALUES ("$day",$average,"$samples"));
$sth = $dbh->prepare( $stmt );
$rv = $sth->execute();
$sth->finish();
print "Current running average for today is $average devices on the network.\n";
$dbh->disconnect();
exit;
# ---------------------------------------------------------------------------
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