Don't fail on windows if bonjour is not installed. fixes #3861

socket module doesn't have AI_ADDRCONFIG attribute under windows

src/common/zeroconf/client_zeroconf.py

@@ -58,9 +58,12 @@ class ZeroconfListener(IdleObject):
 		self.caller = conn_holder.caller
 		self.conn_holder = conn_holder
 
-	def bind(self):
+	def bind(self):
+		flags = socket.AI_PASSIVE
+		if hasattr(socket, 'AI_ADDRCONFIG'):
+			flags |= socket.AI_ADDRCONFIG)
 		ai = socket.getaddrinfo(None, self.port, socket.AF_UNSPEC,
-			socket.SOCK_STREAM, 0, socket.AI_PASSIVE | socket.AI_ADDRCONFIG)[0]
+			socket.SOCK_STREAM, 0, flags)[0]
 		self._serv = socket.socket(ai[0], ai[1])
 		self._serv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 		self._serv.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)

src/common/zeroconf/connection_zeroconf.py

@@ -246,7 +246,7 @@ class ConnectionZeroconf(ConnectionHandlersZeroconf):
 				self.status = 'offline'
 				self.dispatch('CONNECTION_LOST',
 					(_('Could not connect to "%s"') % self.name,
-					_('Please check if Avahi is installed.')))
+					_('Please check if Avahi or Bonjour is installed.')))
 				self.disconnect()
 				return
 			result = self.connection.connect(show, msg)

src/common/zeroconf/zeroconf.py

@@ -31,6 +31,8 @@ def test_bonjour():
 	try:
 		import pybonjour
 	except ImportError:
+		return False
+	except WindowsError:
 		return False
 	return True