141 lines
3.7 KiB
Python
141 lines
3.7 KiB
Python
from __future__ import (absolute_import, print_function, division)
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import socket
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import struct
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import array
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from . import tcp, utils
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class SocksError(Exception):
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def __init__(self, code, message):
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super(SocksError, self).__init__(message)
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self.code = code
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VERSION = utils.BiDi(
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SOCKS4=0x04,
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SOCKS5=0x05
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)
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CMD = utils.BiDi(
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CONNECT=0x01,
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BIND=0x02,
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UDP_ASSOCIATE=0x03
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)
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ATYP = utils.BiDi(
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IPV4_ADDRESS=0x01,
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DOMAINNAME=0x03,
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IPV6_ADDRESS=0x04
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)
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REP = utils.BiDi(
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SUCCEEDED=0x00,
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GENERAL_SOCKS_SERVER_FAILURE=0x01,
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CONNECTION_NOT_ALLOWED_BY_RULESET=0x02,
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NETWORK_UNREACHABLE=0x03,
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HOST_UNREACHABLE=0x04,
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CONNECTION_REFUSED=0x05,
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TTL_EXPIRED=0x06,
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COMMAND_NOT_SUPPORTED=0x07,
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ADDRESS_TYPE_NOT_SUPPORTED=0x08,
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)
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METHOD = utils.BiDi(
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NO_AUTHENTICATION_REQUIRED=0x00,
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GSSAPI=0x01,
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USERNAME_PASSWORD=0x02,
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NO_ACCEPTABLE_METHODS=0xFF
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)
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class ClientGreeting(object):
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__slots__ = ("ver", "methods")
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def __init__(self, ver, methods):
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self.ver = ver
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self.methods = methods
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@classmethod
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def from_file(cls, f):
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ver, nmethods = struct.unpack("!BB", f.safe_read(2))
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methods = array.array("B")
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methods.fromstring(f.safe_read(nmethods))
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return cls(ver, methods)
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def to_file(self, f):
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f.write(struct.pack("!BB", self.ver, len(self.methods)))
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f.write(self.methods.tostring())
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class ServerGreeting(object):
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__slots__ = ("ver", "method")
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def __init__(self, ver, method):
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self.ver = ver
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self.method = method
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@classmethod
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def from_file(cls, f):
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ver, method = struct.unpack("!BB", f.safe_read(2))
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return cls(ver, method)
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def to_file(self, f):
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f.write(struct.pack("!BB", self.ver, self.method))
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class Message(object):
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__slots__ = ("ver", "msg", "atyp", "addr")
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def __init__(self, ver, msg, atyp, addr):
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self.ver = ver
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self.msg = msg
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self.atyp = atyp
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self.addr = addr
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@classmethod
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def from_file(cls, f):
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ver, msg, rsv, atyp = struct.unpack("!BBBB", f.safe_read(4))
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if rsv != 0x00:
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raise SocksError(REP.GENERAL_SOCKS_SERVER_FAILURE,
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"Socks Request: Invalid reserved byte: %s" % rsv)
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if atyp == ATYP.IPV4_ADDRESS:
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# We use tnoa here as ntop is not commonly available on Windows.
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host = socket.inet_ntoa(f.safe_read(4))
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use_ipv6 = False
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elif atyp == ATYP.IPV6_ADDRESS:
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host = socket.inet_ntop(socket.AF_INET6, f.safe_read(16))
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use_ipv6 = True
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elif atyp == ATYP.DOMAINNAME:
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length, = struct.unpack("!B", f.safe_read(1))
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host = f.safe_read(length)
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use_ipv6 = False
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else:
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raise SocksError(REP.ADDRESS_TYPE_NOT_SUPPORTED,
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"Socks Request: Unknown ATYP: %s" % atyp)
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port, = struct.unpack("!H", f.safe_read(2))
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addr = tcp.Address((host, port), use_ipv6=use_ipv6)
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return cls(ver, msg, atyp, addr)
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def to_file(self, f):
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f.write(struct.pack("!BBBB", self.ver, self.msg, 0x00, self.atyp))
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if self.atyp == ATYP.IPV4_ADDRESS:
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f.write(socket.inet_aton(self.addr.host))
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elif self.atyp == ATYP.IPV6_ADDRESS:
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f.write(socket.inet_pton(socket.AF_INET6, self.addr.host))
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elif self.atyp == ATYP.DOMAINNAME:
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f.write(struct.pack("!B", len(self.addr.host)))
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f.write(self.addr.host)
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else:
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raise SocksError(
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REP.ADDRESS_TYPE_NOT_SUPPORTED,
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"Unknown ATYP: %s" % self.atyp
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)
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f.write(struct.pack("!H", self.addr.port))
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