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#!/usr/bin/perl
#
# hoover.pl - Wi-Fi probe requests sniffer
#
# Original idea by David Nelissen (twitter.com/davidnelissen)
# Thank to him for allowing me to reuse the idea!
#
# This script scans for wireless probe requests and prints them out.
# Hereby you can see for which SSID's devices nearby are searching.
#
# Copyright (c) 2012 David Nelissen & Xavier Mertens
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of copyright holders nor the names of its
#    contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL COPYRIGHT HOLDERS OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# History
# -------
# 2012/01/11	Created
#

use strict;
use Getopt::Long;

$SIG{USR1}	= \&dumpNetworks; # Catch SIGINT to dump the detected networks
$SIG{INT}	= \&cleanKill;
$SIG{KILL}	= \&cleanKill;
$SIG{TERM}	= \&cleanKill;

my $uniqueSSID = 0;		#uniq ssid counter
my %detectedSSID;	# Detected network will be stored in a hash table
			# SSID, Seen packets, Last timestamp
my $pid;
my $help;
my $verbose;
my $interface;
my $dumpFile;
my $ifconfigPath = "/sbin/ifconfig";
my $iwconfigPath = "/sbin/iwconfig";
my $tsharkPath   = "/usr/local/bin/tshark";
my $options = GetOptions(
	"verbose"		=> \$verbose,
	"help"			=> \$help,
	"interface=s"		=> \$interface,
	"ifconfig-path=s"	=> \$ifconfigPath,
	"iwconfig-path=s"	=> \$iwconfigPath,
	"tsharkPath=s"		=> \$tsharkPath,
	"dumpfile=s"		=> \$dumpFile,
);

if ($help) {
	print <<_HELP_;
Usage: $0 --interface=wlan0 [--help] [--verbose] [--iwconfig-path=/sbin/iwconfig] [--ipconfig-path=/sbin/ifconfig]
		[--dumpfile=result.txt]
Where:
--interface		: Specify the wireless interface to use
--help			: This help
--verbose		: Verbose output to STDOUT
--ifconfig-path		: Path to your ifconfig binary
--iwconfig-path		: Path to your iwconfig binary
--tshark-path		: Path to your tshark binary
--dumpfile		: Save found SSID's/MAC addresses in a flat file (SIGUSR1)
_HELP_
	exit 0;
}

# We must be run by root
(getlogin() ne "root") && die "$0 must be run by root!\n";

# We must have an interface to listen to
(!$interface) && die "No wireless interface speficied!\n";

# Check ifconfig availability
( ! -x $ifconfigPath) && die "ifconfig tool not found!\n";

# Check iwconfig availability
( ! -x $iwconfigPath) && die "iwconfig tool not found!\n";

# Check tshark availability
( ! -x $tsharkPath) && die "tshark tool not available!\n";

# Configure wireless interface
(system("$ifconfigPath $interface up")) && "Cannot initialize interface $interface!\n";

# Set interface in monitor mode
(system("$iwconfigPath $interface mode monitor")) && die "Cannot set interface $interface in monitoring mode!\n";

# Create the child process to change wireless channels
(!defined($pid = fork)) && die "Cannot fork child process!\n";

if ($pid) {
	# ---------------------------------
	# Parent process: run the main loop
	# ---------------------------------
	($verbose) && print "!! Running with PID: $$ (child: $pid)\n";
	open(TSHARK, "$tsharkPath -i $interface -n -l subtype probereq |") || die "Cannot spawn tshark process!\n";
	while (<TSHARK>) {
		chomp;
		my $line = $_;
		chomp($line = $_); 
		# Everything exept backslash (some probes contains the ssid in ascii, not usable)
		#if($line = m/\d+\.\d+ ([a-zA-Z0-9:]+).+SSID=([a-zA-ZÀ-ÿ0-9"\s\!\@\$\%\^\&\*\(\)\_\-\+\=\[\]\{\}\,\.\?\>\<]+)/) { 
		if($line = m/\d+\.\d+ ([a-zA-Z0-9:_]+).+SSID=([a-zA-ZÀ-ÿ0-9"\s\!\@\$\%\^\&\*\(\)\_\-\+\=\[\]\{\}\,\.\?\>\<]+)/) { 
			if($2 ne "Broadcast") {	# Ignore broadcasts
				my $macAddress = $1;
				my $newKey = $2;
				print DEBUG "$macAddress : $newKey\n";
				if (! $detectedSSID{$newKey})
				{
					# New network found!
					my @newSSID = ( $newKey,		# SSID
							1,			# First packet
							$macAddress,		# MAC Address
							time());		# Seen now
					$detectedSSID{$newKey} = [ @newSSID ];
					$uniqueSSID++;
					print "++ New probe request from $macAddress with SSID: $newKey [$uniqueSSID]\n";
				}
				else
				{
					# Existing SSID found!
					$detectedSSID{$newKey}[1]++;			# Increase packets counter
					$detectedSSID{$newKey}[2] = $macAddress;	# MAC Address
					$detectedSSID{$newKey}[3] = time();		# Now
					($verbose) && print "-- Probe seen before: $newKey [$uniqueSSID]\n";
				}
			}
		}	
	}
}
else {
	# --------------------------------------------------
	# Child process: Switch channels at regular interval
	# --------------------------------------------------
	($verbose) && print STDOUT "!! Switching wireless channel every 5\".\n";
	while (1) {
		for (my $channel = 1; $channel <= 12; $channel++) {
			(system("$iwconfigPath $interface channel $channel")) &&
				die "Cannot set interface channel.\n";
			sleep(5);
		}
	}
	
}

sub dumpNetworks {
	my $i;
	my $key;
	print STDOUT "!! Dumping detected networks:\n";
	print STDOUT "!! MAC Address          SSID                           Count      Last Seen\n";
	print STDOUT "!! -------------------- ------------------------------ ---------- -------------------\n";
	if ($dumpFile) {
		open(DUMP, ">$dumpFile") || die "Cannot write to $dumpFile (Error: $?)";
		print DUMP "MAC Address          SSID                           Count      Last Seen\n";
		print DUMP "-------------------- ------------------------------ ---------- -------------------\n";
	}
	for $key ( keys %detectedSSID)
	{
		my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($detectedSSID{$key}[2]);
		my $lastSeen = sprintf("%04d/%02d/%02d %02d:%02d:%02d", $year+1900, $mon+1, $mday, $hour, $min, $sec);
		print STDOUT sprintf("!! %-20s %-30s %10s %-20s\n", $detectedSSID{$key}[2],
		 				 $detectedSSID{$key}[0], $detectedSSID{$key}[1], $lastSeen);
		($dumpFile) && print DUMP sprintf("%-20s %-30s %10s %-20s\n", 
						 $detectedSSID{$key}[2], $detectedSSID{$key}[0],
						 $detectedSSID{$key}[1], $lastSeen); 
	}
	print STDOUT "!! Total unique SSID: $uniqueSSID\n";
	($dumpFile) && print DUMP "Total unique SSID: $uniqueSSID\n";
	close(DUMP);
	return;
}

sub cleanKill {
	if ($pid) {
		# Parent process: display information
		print "!! Received kill signal!\n";
		kill 1, $pid;
		dumpNetworks;
	}
	exit 0;
}