module EventMachine::Socksify::SOCKS5
Public Instance Methods
socks_send_authentication()
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# File lib/em-socksify/socks5.rb, line 33 def socks_send_authentication @socks_state = :authenticating send_data [5, @socks_username.length, @socks_username, @socks_password.length, @socks_password ].pack('CCA*CA*') end
socks_send_connect_request()
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# File lib/em-socksify/socks5.rb, line 15 def socks_send_connect_request @socks_state = :connecting send_data [5, 1, 0].pack('CCC') if matches = @socks_target_host.match(/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/) send_data "\x01" + matches.to_a[1 .. -1].map { |s| s.to_i }.pack('CCCC') elsif @socks_target_host =~ /^[:0-9a-f]+$/ raise SOCKSError, 'TCP/IPv6 over SOCKS is not yet supported (inet_pton missing in Ruby & not supported by Tor)' else send_data [3, @socks_target_host.size, @socks_target_host].pack('CCA*') end send_data [@socks_target_port].pack('n') end
socks_send_handshake()
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# File lib/em-socksify/socks5.rb, line 5 def socks_send_handshake # Method Negotiation as described on # http://www.faqs.org/rfcs/rfc1928.html Section 3 @socks_state = :method_negotiation socks_methods.tap do |methods| send_data [5, methods.size].pack('CC') + methods.pack('C*') end end
Private Instance Methods
socks_methods()
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# File lib/em-socksify/socks5.rb, line 107 def socks_methods methods = [] methods << 2 if !@socks_username.nil? # 2 => Username/Password Authentication methods << 0 # 0 => No Authentication Required methods end
socks_parse_response()
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parses socks 5 server responses as specified on www.faqs.org/rfcs/rfc1928.html
# File lib/em-socksify/socks5.rb, line 46 def socks_parse_response case @socks_state when :method_negotiation return unless @socks_data.size >= 2 _, method = @socks_data.slice!(0, 2).unpack('CC') if socks_methods.include?(method) case method when 0 then socks_send_connect_request when 2 then socks_send_authentication end else raise SOCKSError, 'proxy did not accept method' end when :authenticating return unless @socks_data.size >= 2 socks_version, status_code = @socks_data.slice!(0, 2).unpack('CC') raise SOCKSError, "SOCKS version 5 not supported" unless socks_version == 5 raise SOCKSError, 'access denied by proxy' unless status_code == 0 send_socks_connect_request when :connecting return unless @socks_data.size >= 2 socks_version, status_code = @socks_data.slice(0, 2).unpack('CC') raise SOCKSError, "SOCKS version #{socks_version} is not 5" unless socks_version == 5 raise SOCKSError.for_response_code(status_code) unless status_code == 0 min_size = @socks_data[3].ord == 3 ? 5 : 4 return unless @socks_data.size >= min_size size = case @socks_data[3].ord when 1 then 4 when 3 then @socks_data[4].ord when 4 then 16 else raise SOCKSError.for_response_code(@socks_data[3]) end return unless @socks_data.size >= (min_size + size) bind_addr = @socks_data.slice(min_size, size) ip = case @socks_data[3].ord when 1 then bind_addr.bytes.to_a.join('.') when 3 then bind_addr when 4 then # TODO: ??? end socks_unhook(ip) end rescue Exception => e @socks_deferrable.fail(e) end