mirror of
https://github.com/Grasscutters/mitmproxy.git
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61 lines
2.2 KiB
Python
61 lines
2.2 KiB
Python
from __future__ import (absolute_import, print_function, division)
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from netlib import socks
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from netlib.exceptions import TcpException
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from ...exceptions import Socks5ProtocolException
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from ...protocol import Layer, ServerConnectionMixin
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class Socks5Proxy(Layer, ServerConnectionMixin):
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def __call__(self):
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try:
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# Parse Client Greeting
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client_greet = socks.ClientGreeting.from_file(self.client_conn.rfile, fail_early=True)
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client_greet.assert_socks5()
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if socks.METHOD.NO_AUTHENTICATION_REQUIRED not in client_greet.methods:
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raise socks.SocksError(
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socks.METHOD.NO_ACCEPTABLE_METHODS,
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"mitmproxy only supports SOCKS without authentication"
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)
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# Send Server Greeting
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server_greet = socks.ServerGreeting(
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socks.VERSION.SOCKS5,
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socks.METHOD.NO_AUTHENTICATION_REQUIRED
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)
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server_greet.to_file(self.client_conn.wfile)
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self.client_conn.wfile.flush()
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# Parse Connect Request
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connect_request = socks.Message.from_file(self.client_conn.rfile)
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connect_request.assert_socks5()
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if connect_request.msg != socks.CMD.CONNECT:
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raise socks.SocksError(
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socks.REP.COMMAND_NOT_SUPPORTED,
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"mitmproxy only supports SOCKS5 CONNECT."
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)
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# We always connect lazily, but we need to pretend to the client that we connected.
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connect_reply = socks.Message(
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socks.VERSION.SOCKS5,
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socks.REP.SUCCEEDED,
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connect_request.atyp,
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# dummy value, we don't have an upstream connection yet.
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connect_request.addr
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)
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connect_reply.to_file(self.client_conn.wfile)
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self.client_conn.wfile.flush()
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except (socks.SocksError, TcpException) as e:
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raise Socks5ProtocolException("SOCKS5 mode failure: %s" % repr(e))
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self.server_conn.address = connect_request.addr
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layer = self.ctx.next_layer(self)
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try:
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layer()
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finally:
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if self.server_conn:
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self.disconnect()
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