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diff --git a/src/leap/bitmask/vpn/_telnet.py b/src/leap/bitmask/vpn/_telnet.py
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+# -*- coding: utf-8 -*-
+# _telnet.py
+# Copyright (C) 2013-2017 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import socket
+import telnetlib
+
+
+class ConnectionRefusedError(Exception):
+ pass
+
+
+class MissingSocketError(Exception):
+ pass
+
+
+class UDSTelnet(telnetlib.Telnet):
+ """
+ A telnet-alike class, that can listen on unix domain sockets
+ """
+
+ def open(self, host, port=23, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
+ """
+ Connect to a host. If port is 'unix', it will open a
+ connection over unix docmain sockets.
+
+ The optional second argument is the port number, which
+ defaults to the standard telnet port (23).
+ Don't try to reopen an already connected instance.
+ """
+ self.eof = 0
+ self.host = host
+ self.port = port
+ self.timeout = timeout
+
+ if self.port == "unix":
+ # unix sockets spoken
+ if not os.path.exists(self.host):
+ raise MissingSocketError()
+ self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+ try:
+ self.sock.connect(self.host)
+ except socket.error:
+ raise ConnectionRefusedError()
+ else:
+ self.sock = socket.create_connection((host, port), timeout)