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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::Capture
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  OUI_LIST = Rex::Oui
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  def initialize
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    super(
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      'Name'        => 'ARP Sweep Local Network Discovery',
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      'Description' => %q{
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        Enumerate alive Hosts in local network using ARP requests.
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      },
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      'Author'      => 'belch',
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      'License'     => MSF_LICENSE
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    )
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    register_options([
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      OptString.new('SHOST', [false, "Source IP Address"]),
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      OptString.new('SMAC', [false, "Source MAC Address"]),
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      # one re-register TIMEOUT here with a lower value, cause 5 seconds will be enough in most of the case
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      OptInt.new('TIMEOUT', [true, 'The number of seconds to wait for new data', 5]),
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    ])
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    deregister_options('SNAPLEN', 'FILTER', 'PCAPFILE', 'SECRET', 'GATEWAY_PROBE_HOST', 'GATEWAY_PROBE_PORT')
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  end
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  def run_batch_size
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    datastore['BATCHSIZE'] || 256
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  end
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  def run_batch(hosts)
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    open_pcap({'SNAPLEN' => 68, 'FILTER' => "arp[6:2] == 0x0002"})
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    @netifaces = true
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    if not netifaces_implemented?
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      print_error("WARNING : NetworkInterface is not up-to-date, some functionality will not be available")
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      @netifaces = false
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    end
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    @interface = datastore['INTERFACE'] || Pcap.lookupdev
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    shost = datastore['SHOST']
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    shost ||= get_ipv4_addr(@interface) if @netifaces
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    raise 'SHOST should be defined' unless shost
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    smac  = datastore['SMAC']
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    smac ||= get_mac(@interface) if @netifaces
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    raise 'SMAC should be defined' unless smac
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    begin
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    hosts.each do |dhost|
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      if dhost != shost
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        probe = buildprobe(shost, smac, dhost)
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        inject(probe)
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        while(reply = getreply())
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          next unless reply.is_arp?
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          company = OUI_LIST::lookup_oui_company_name(reply.arp_saddr_mac)
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          print_good("#{reply.arp_saddr_ip} appears to be up (#{company}).")
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          report_host(:host => reply.arp_saddr_ip, :mac=>reply.arp_saddr_mac)
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          report_note(:host  => reply.arp_saddr_ip, :type  => "mac_oui", :data  => company)
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        end
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      end
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    end
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    etime = Time.now.to_f + datastore['TIMEOUT']
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    while (Time.now.to_f < etime)
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      while(reply = getreply())
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        next unless reply.is_arp?
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        company = OUI_LIST::lookup_oui_company_name(reply.arp_saddr_mac)
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        print_good("#{reply.arp_saddr_ip} appears to be up (#{company}).")
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        report_host(:host => reply.arp_saddr_ip, :mac=>reply.arp_saddr_mac)
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        report_note(:host  => reply.arp_saddr_ip, :type  => "mac_oui", :data  => company)
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      end
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      Kernel.select(nil, nil, nil, 0.50)
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    end
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    ensure
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      close_pcap()
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    end
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  end
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  def buildprobe(shost, smac, dhost)
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    p = PacketFu::ARPPacket.new
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    p.eth_saddr = smac
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    p.eth_daddr = "ff:ff:ff:ff:ff:ff"
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    p.arp_opcode = 1
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    p.arp_saddr_mac = p.eth_saddr
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    p.arp_daddr_mac = p.eth_daddr
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    p.arp_saddr_ip = shost
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    p.arp_daddr_ip = dhost
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    p.recalc
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    p
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  end
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  def getreply
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    pkt_bytes = capture.next
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    Kernel.select(nil,nil,nil,0.1)
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    return unless pkt_bytes
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    pkt = PacketFu::Packet.parse(pkt_bytes)
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    return unless pkt.is_arp?
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    return unless pkt.arp_opcode == 2
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    pkt
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  end
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end
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