[Mono-bugs] [Bug 643475] Socket.ExclusiveAddressUse not working with UDP

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https://bugzilla.novell.com/show_bug.cgi?id=643475

https://bugzilla.novell.com/show_bug.cgi?id=643475#c1


--- Comment #1 from Antonio Anzivino <djechelon at fastwebnet.it> 2010-10-04 11:14:05 UTC ---
We just submitted a workaround into our code repository

http://logbus-ng.svn.sourceforge.net/viewvc/logbus-ng?view=revision&revision=396

Everyone experiencing the same problem could use our approach: scan the list of
running UDP listeners via IPGlobalProperties

For each port in the range of known ports, try to find it in the active sockets
list ;-)

#if MONO
                IPEndPoint[] eps =
IPGlobalProperties.GetIPGlobalProperties().GetActiveUdpListeners();
#endif
                for (int i = START_PORT; i <= END_PORT; i++)
                {
#if MONO
                    //Workaround to Mono bug 64375
                    bool found = false;
                    for (int c = 0; c < eps.Length; c++)
                    {
                        if (eps[c].Port == i &&
(eps[c].Address.Equals(IPAddress.Any) || eps[c].Address.Equals(localIp)))
                        {
                            found = true;
                            break;
                        }
                    }
                    if (!found)
                    {
                        Socket socket = new Socket(AddressFamily.InterNetwork,
SocketType.Dgram, ProtocolType.Udp);
                        socket.Bind(new IPEndPoint(localIp, i));
                        _client = new UdpClient { Client = socket };
                        break;
                    }
#else
                    try
                    {
                        Socket socket = new Socket(AddressFamily.InterNetwork,
SocketType.Dgram, ProtocolType.Udp) { ExclusiveAddressUse = true };
                        socket.Bind(new IPEndPoint(localIp, i));

                        _client = new UdpClient { Client = socket };
                        break;
                    }
                    catch (SocketException)
                    { }
#endif
                }

Adapt this code to your needs and voilà

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