Class: TCPSocket

Inherits:
Object
  • Object
show all
Defined in:
lib/socksify.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host = nil, port = 0, local_host = "0.0.0.0", local_port = 0) ⇒ TCPSocket

See tools.ietf.org/html/rfc1928



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# File 'lib/socksify.rb', line 124

def initialize(host=nil, port=0, local_host="0.0.0.0", local_port=0)
  socks_server = self.class.socks_server
  socks_port = self.class.socks_port
  socks_ignores = self.class.socks_ignores

  if socks_server and socks_port and not socks_ignores.include?(host)
    Socksify::debug_notice "Connecting to SOCKS server #{socks_server}:#{socks_port}"
    initialize_tcp socks_server, socks_port

    socks_authenticate unless @@socks_version =~ /^4/

    if host
      socks_connect(host, port)
    end
  else
    Socksify::debug_notice "Connecting directly to #{host}:#{port}"
    initialize_tcp host, port, local_host, local_port
    Socksify::debug_debug "Connected to #{host}:#{port}"
  end
end

Class Method Details

.socks_ignores ⇒ Object 



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# File 'lib/socksify.rb', line 114

def self.socks_ignores
  @@socks_ignores ||= []
end

.socks_ignores=(ignores) ⇒ Object 



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# File 'lib/socksify.rb', line 117

def self.socks_ignores=(ignores)
  @@socks_ignores = ignores
end

.socks_port ⇒ Object 



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# File 'lib/socksify.rb', line 108

def self.socks_port
  @@socks_port ||= nil
end

.socks_port=(port) ⇒ Object 



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# File 'lib/socksify.rb', line 111

def self.socks_port=(port)
  @@socks_port = port
end

.socks_server ⇒ Object 



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# File 'lib/socksify.rb', line 102

def self.socks_server
  @@socks_server ||= nil
end

.socks_server=(host) ⇒ Object 



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# File 'lib/socksify.rb', line 105

def self.socks_server=(host)
  @@socks_server = host
end

.socks_version ⇒ Object 



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# File 'lib/socksify.rb', line 96

def self.socks_version
  (@@socks_version == "4a" or @@socks_version == "4") ? "\004" : "\005"
end

.socks_version=(version) ⇒ Object 



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# File 'lib/socksify.rb', line 99

def self.socks_version=(version)
  @@socks_version = version.to_s
end

Instance Method Details

#initialize_tcp ⇒ Object 



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# File 'lib/socksify.rb', line 121

alias :initialize_tcp :initialize

#socks_authenticate ⇒ Object

Authentication



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# File 'lib/socksify.rb', line 146

def socks_authenticate
  Socksify::debug_debug "Sending no authentication"
  write "\005\001\000"
  Socksify::debug_debug "Waiting for authentication reply"
  auth_reply = recv(2)
  if auth_reply[0..0] != "\004" and auth_reply[0..0] != "\005"
    raise SOCKSError.new("SOCKS version #{auth_reply[0..0]} not supported")
  end
  if auth_reply[1..1] != "\000"
    raise SOCKSError.new("SOCKS authentication method #{auth_reply[1..1]} neither requested nor supported")
  end
end

#socks_connect(host, port) ⇒ Object

Connect



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# File 'lib/socksify.rb', line 160

def socks_connect(host, port)
  Socksify::debug_debug "Sending destination address"
  write TCPSocket.socks_version
  Socksify::debug_debug TCPSocket.socks_version.unpack "H*"
  write "\001"
  write "\000" if @@socks_version == "5"
  write [port].pack('n') if @@socks_version =~ /^4/

  if @@socks_version == "4"
    host = Resolv::DNS.new.getaddress(host).to_s
  end
  Socksify::debug_debug host
  if host =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/  # to IPv4 address
    write "\001" if @@socks_version == "5"
    _ip = [$1.to_i,
           $2.to_i,
           $3.to_i,
           $4.to_i
          ].pack('CCCC')
    write _ip
  elsif host =~ /^[:0-9a-f]+$/  # to IPv6 address
    raise "TCP/IPv6 over SOCKS is not yet supported (inet_pton missing in Ruby & not supported by Tor"
    write "\004"
  else                          # to hostname
    if @@socks_version == "5"
      write "\003" + [host.size].pack('C') + host
    else
      write "\000\000\000\001"
      write "\007\000"
      Socksify::debug_notice host
      write host
      write "\000"
    end
  end
  write [port].pack('n') if @@socks_version == "5"

  socks_receive_reply
  Socksify::debug_notice "Connected to #{host}:#{port} over SOCKS"
end

#socks_receive_reply ⇒ Object

returns [bind_addr: String, bind_port: Fixnum]



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# File 'lib/socksify.rb', line 201

def socks_receive_reply
  Socksify::debug_debug "Waiting for SOCKS reply"
  if @@socks_version == "5"
    connect_reply = recv(4)
    Socksify::debug_debug connect_reply.unpack "H*"
    if connect_reply[0..0] != "\005"
      raise SOCKSError.new("SOCKS version #{connect_reply[0..0]} is not 5")
    end
    if connect_reply[1..1] != "\000"
      raise SOCKSError.for_response_code(connect_reply.bytes.to_a[1])
    end
    Socksify::debug_debug "Waiting for bind_addr"
    bind_addr_len = case connect_reply[3..3]
                    when "\001"
                      4
                    when "\003"
                      recv(1).bytes.first
                    when "\004"
                      16
                    else
                      raise SOCKSError.for_response_code(connect_reply.bytes.to_a[3])
                    end
    bind_addr_s = recv(bind_addr_len)
    bind_addr = case connect_reply[3..3]
                when "\001"
                  bind_addr_s.bytes.to_a.join('.')
                when "\003"
                  bind_addr_s
                when "\004"  # Untested!
                  i = 0
                  ip6 = ""
                  bind_addr_s.each_byte do |b|
                    if i > 0 and i % 2 == 0
                      ip6 += ":"
                    end
                    i += 1

                    ip6 += b.to_s(16).rjust(2, '0')
                  end
                end
    bind_port = recv(bind_addr_len + 2)
    [bind_addr, bind_port.unpack('n')]
  else
    connect_reply = recv(8)
    unless connect_reply[0] == "\000" and connect_reply[1] == "\x5A"
      Socksify::debug_debug connect_reply.unpack 'H'
      raise SOCKSError.new("Failed while connecting througth socks")
    end
  end
end