105 lines
3.2 KiB
Ruby
105 lines
3.2 KiB
Ruby
require "ipaddr"
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require "proxifier/proxy"
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module Proxifier
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class SOCKSProxy < Proxy
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VERSION = 0x05
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SUBNEGOTIATION_VERSION = 0x01
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def do_proxify(socket, host, port)
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authenticaton_method = greet(socket)
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authenticate(socket, authenticaton_method)
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connect(socket, host, port)
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end
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protected
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def greet(socket)
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methods = authentication_methods
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socket << [VERSION, methods.size, *methods].pack("CCC#{methods.size}")
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version, authentication_method = socket.read(2).unpack("CC")
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check_version(version)
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authentication_method
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end
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def authenticate(socket, method)
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case method
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when 0x00 # NO AUTHENTICATION REQUIRED
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when 0x02 # USERNAME/PASSWORD
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_user = user ? user[0, 0xFF] : ''
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_password = password ? password[0, 0xFF] : ''
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socket << [SUBNEGOTIATION_VERSION, _user.size, _user, _password.size, _password].pack("CCA#{_user.size}CA#{_password.size}")
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version, status = socket.read(2).unpack('CC')
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check_version(version, SUBNEGOTIATION_VERSION)
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case status
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when 0x00 # SUCCESS
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else
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raise "SOCKS5 username/password authentication failed"
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end
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else
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raise "no acceptable SOCKS5 authentication methods"
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end
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end
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def connect(socket, host, port)
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host = host[0, 0xFF]
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socket << [VERSION, 0x01, 0x00, 0x03, host.size, host, port].pack("CCCCCA#{host.size}n")
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version, status, _, type = socket.read(4).unpack("CCCC")
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check_version(version)
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case status
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when 0x00 # succeeded
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when 0x01 # general SOCKS server failure
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raise "general SOCKS server failure"
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when 0x02 # connection not allowed by ruleset
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raise "connection not allowed by ruleset"
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when 0x03 # Network unreachable
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raise "network unreachable"
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when 0x04 # Host unreachable
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raise "host unreachable"
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when 0x05 # Connection refused
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raise "connection refused"
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when 0x06 # TTL expired
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raise "TTL expired"
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when 0x07 # Command not supported
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raise "command not supported"
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when 0x08 # Address type not supported
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raise "address type not supported"
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else # unassigned
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raise "unknown SOCKS error"
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end
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case type
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when 0x01 # IP V4 address
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destination = IPAddr.ntop(socket.read(4))
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when 0x03 # DOMAINNAME
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length = socket.read(1).unpack("C").first
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destination = socket.read(length).unpack("A#{length}")
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when 0x04 # IP V6 address
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destination = IPAddr.ntop(socket.read(16))
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else
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raise "unsupported SOCKS5 address type"
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end
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port = socket.read(2).unpack("n").first
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end
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def check_version(version, should_be = VERSION)
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raise "mismatched SOCKS version" unless version == should_be
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end
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private
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def authentication_methods
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methods = []
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methods << 0x00 # NO AUTHENTICATION REQUIRED
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methods << 0x02 if user # USERNAME/PASSWORD
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methods
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end
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end
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SOCKS5Proxy = SOCKSProxy
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end
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