add reverseproxy mode, fix bugs

libmproxy/protocol2/__init__.py

@@ -1,6 +1,7 @@
 from __future__ import (absolute_import, print_function, division)
 from .layer import RootContext
 from .socks import Socks5IncomingLayer
+from .reverse_proxy import ReverseProxy
 from .rawtcp import TcpLayer
 from .auto import AutoLayer
-__all__ = ["Socks5IncomingLayer", "TcpLayer", "AutoLayer", "RootContext"]
+__all__ = ["Socks5IncomingLayer", "TcpLayer", "AutoLayer", "RootContext", "ReverseProxy"]

libmproxy/protocol2/layer.py

@@ -176,7 +176,7 @@ def yield_from_callback(fun):
     """
     yield_queue = Queue.Queue()
 
-    def do_yield(self, msg):
+    def do_yield(msg):
         yield_queue.put(msg)
         yield_queue.get()
 
@@ -192,14 +192,14 @@ def yield_from_callback(fun):
 
         threading.Thread(target=run, name="YieldFromCallbackThread").start()
         while True:
-            e = yield_queue.get()
-            if e is True:
+            msg = yield_queue.get()
+            if msg is True:
                 break
-            elif isinstance(e, Exception):
+            elif isinstance(msg, Exception):
                 # TODO: Include func name?
-                raise ProxyError2("Error from callback: " + repr(e), e)
+                raise ProxyError2("Error in %s: %s" % (fun.__name__, repr(msg)), msg)
             else:
-                yield e
+                yield msg
                 yield_queue.put(None)
 
         self.yield_from_callback = None

libmproxy/protocol2/reverse_proxy.py

@@ -0,0 +1,19 @@
+from __future__ import (absolute_import, print_function, division)
+
+from .layer import Layer, ServerConnectionMixin
+from .ssl import SslLayer
+
+
+class ReverseProxy(Layer, ServerConnectionMixin):
+
+    def __init__(self, ctx, server_address, client_ssl, server_ssl):
+        super(ReverseProxy, self).__init__(ctx)
+        self.server_address = server_address
+        self.client_ssl = client_ssl
+        self.server_ssl = server_ssl
+
+    def __call__(self):
+        layer = SslLayer(self, self.client_ssl, self.server_ssl)
+        for message in layer():
+            if not self._handle_server_message(message):
+                yield message

libmproxy/protocol2/ssl.py

@@ -14,7 +14,7 @@ class SslLayer(Layer):
         self._client_ssl = client_ssl
         self._server_ssl = server_ssl
         self._connected = False
-        self._sni_from_handshake = None
+        self.client_sni = None
         self._sni_from_server_change = None
 
     def __call__(self):
@@ -74,7 +74,7 @@ class SslLayer(Layer):
         if self._sni_from_server_change is False:
             return None
         else:
-            return self._sni_from_server_change or self._sni_from_handshake
+            return self._sni_from_server_change or self.client_sni
 
     def _establish_ssl_with_client_and_server(self):
         """
@@ -97,7 +97,7 @@ class SslLayer(Layer):
             else:
                 raise RuntimeError("Unexpected Message: %s" % message)
 
-        if server_err and not self._sni_from_handshake:
+        if server_err and not self.client_sni:
             raise server_err
 
     def handle_sni(self, connection):
@@ -111,14 +111,14 @@ class SslLayer(Layer):
             sn = connection.get_servername()
             if not sn:
                 return
-            self._sni_from_handshake = sn.decode("utf8").encode("idna")
+            self.client_sni = sn.decode("utf8").encode("idna")
 
             if old_upstream_sni != self.sni_for_upstream_connection:
                 # Perform reconnect
                 if self.server_ssl:
                     self.yield_from_callback(Reconnect())
 
-            if self._sni_from_handshake:
+            if self.client_sni:
                 # Now, change client context to reflect possibly changed certificate:
                 cert, key, chain_file = self.find_cert()
                 new_context = self.client_conn.create_ssl_context(
@@ -195,8 +195,8 @@ class SslLayer(Layer):
                 sans.add(host)
                 host = upstream_cert.cn.decode("utf8").encode("idna")
         # Also add SNI values.
-        if self._sni_from_handshake:
-            sans.add(self._sni_from_handshake)
+        if self.client_sni:
+            sans.add(self.client_sni)
         if self._sni_from_server_change:
             sans.add(self._sni_from_server_change)
 

libmproxy/proxy/server.py

@@ -79,7 +79,7 @@ class ConnectionHandler2:
             self.config,
             self.channel
         )
-        root_layer = protocol2.Socks5IncomingLayer(root_context)
+        root_layer = protocol2.ReverseProxy(root_context, ("localhost", 5000), True, True)
 
         try:
             for message in root_layer():