Added code to rebind socket after a NetConnected socket error; thanks Rhee

Lidgren.Network/NetPeer.Internal.cs

@@ -1,4 +1,4 @@
-#if !__ANDROID__ && !IOS && !UNITY_WEBPLAYER
+#if !__ANDROID__ && !IOS && !UNITY_WEBPLAYER && !UNITY_ANDROID && !UNITY_IPHONE
 #define IS_MAC_AVAILABLE
 #endif
 
@@ -24,6 +24,7 @@ namespace Lidgren.Network
 		private object m_initializeLock = new object();
 		private uint m_frameCounter;
 		private double m_lastHeartbeat;
+		private double m_lastSocketBind = float.MinValue;
 		private NetUPnP m_upnp;
 
 		internal readonly NetPeerConfiguration m_configuration;
@@ -102,6 +103,46 @@ namespace Lidgren.Network
 			}
 		}
 
+		private void BindSocket(bool reBind)
+		{
+			double now = NetTime.Now;
+			if (now - m_lastSocketBind < 1.0)
+			{
+				LogDebug("Suppressed socket rebind; last bound " + (now - m_lastSocketBind) + " seconds ago");
+				return; // only allow rebind once every second
+			}
+			m_lastSocketBind = now;
+
+			if (m_socket == null)
+				m_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
+
+			if (reBind)
+				m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, (int)1); 
+
+			m_socket.ReceiveBufferSize = m_configuration.ReceiveBufferSize;
+			m_socket.SendBufferSize = m_configuration.SendBufferSize;
+			m_socket.Blocking = false;
+
+			var ep = (EndPoint)new IPEndPoint(m_configuration.LocalAddress, m_configuration.Port);
+			m_socket.Bind(ep);
+
+			try
+			{
+				const uint IOC_IN = 0x80000000;
+				const uint IOC_VENDOR = 0x18000000;
+				uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;
+				m_socket.IOControl((int)SIO_UDP_CONNRESET, new byte[] { Convert.ToByte(false) }, null);
+			}
+			catch
+			{
+				// ignore; SIO_UDP_CONNRESET not supported on this platform
+			}
+
+			IPEndPoint boundEp = m_socket.LocalEndPoint as IPEndPoint;
+			LogDebug("Socket bound to " + boundEp + ": " + m_socket.IsBound);
+			m_listenPort = boundEp.Port;
+		}
+
 		private void InitializeNetwork()
 		{
 			lock (m_initializeLock)
@@ -121,32 +162,7 @@ namespace Lidgren.Network
 				m_handshakes.Clear();
 
 				// bind to socket
-				IPEndPoint iep = null;
-
-				iep = new IPEndPoint(m_configuration.LocalAddress, m_configuration.Port);
-				EndPoint ep = (EndPoint)iep;
-
-				m_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
-				m_socket.ReceiveBufferSize = m_configuration.ReceiveBufferSize;
-				m_socket.SendBufferSize = m_configuration.SendBufferSize;
-				m_socket.Blocking = false;
-				m_socket.Bind(ep);
-
-				try
-				{
-					const uint IOC_IN = 0x80000000;
-					const uint IOC_VENDOR = 0x18000000;
-					uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;
-					m_socket.IOControl((int)SIO_UDP_CONNRESET, new byte[] { Convert.ToByte(false) }, null);
-				}
-				catch
-				{
-					// ignore; SIO_UDP_CONNRESET not supported on this platform
-				}
-
-				IPEndPoint boundEp = m_socket.LocalEndPoint as IPEndPoint;
-				LogDebug("Socket bound to " + boundEp + ": " + m_socket.IsBound);
-				m_listenPort = boundEp.Port;
+				BindSocket(false);
 
 				m_receiveBuffer = new byte[m_configuration.ReceiveBufferSize];
 				m_sendBuffer = new byte[m_configuration.SendBufferSize];
@@ -175,6 +191,7 @@ namespace Lidgren.Network
 					// not supported; lets just keep the random bytes set above
 				}
 #endif
+				IPEndPoint boundEp = m_socket.LocalEndPoint as IPEndPoint;
 				byte[] epBytes = BitConverter.GetBytes(boundEp.GetHashCode());
 				byte[] combined = new byte[epBytes.Length + macBytes.Length];
 				Array.Copy(epBytes, 0, combined, 0, epBytes.Length);
@@ -255,9 +272,20 @@ namespace Lidgren.Network
 						{
 							m_socket.Shutdown(SocketShutdown.Receive);
 						}
-						catch { }
+						catch(Exception ex)
+						{
+							LogDebug("Socket.Shutdown exception: " + ex.ToString());
+						}
+
+						try
+						{
 							m_socket.Close(2); // 2 seconds timeout
 						}
+						catch (Exception ex)
+						{
+							LogDebug("Socket.Close exception: " + ex.ToString());
+						}
+					}
 				}
 				finally
 				{
@@ -270,6 +298,7 @@ namespace Lidgren.Network
 						m_messageReceivedEvent.Set();
 				}
 
+				m_lastSocketBind = float.MinValue;
 				m_receiveBuffer = null;
 				m_sendBuffer = null;
 				m_unsentUnconnectedMessages.Clear();
@@ -393,17 +422,24 @@ namespace Lidgren.Network
 				}
 				catch (SocketException sx)
 				{
-					if (sx.SocketErrorCode == SocketError.ConnectionReset)
+					switch (sx.SocketErrorCode)
 					{
+						case SocketError.ConnectionReset:
 							// connection reset by peer, aka connection forcibly closed aka "ICMP port unreachable" 
 							// we should shut down the connection; but m_senderRemote seemingly cannot be trusted, so which connection should we shut down?!
 							// So, what to do?
 							LogWarning("ConnectionReset");
 							return;
-					}
 
-					LogWarning(sx.ToString());
+						case SocketError.NotConnected:
+							// socket is unbound; try to rebind it (happens on mobile when process goes to sleep)
+							BindSocket(true);
 							return;
+
+						default:
+							LogWarning("Socket exception: " + sx.ToString());
+							return;
+					}
 				}
 
 				if (bytesReceived < NetConstants.HeaderByteSize)

Lidgren.Network/NetRandomSeed.cs

@@ -28,7 +28,7 @@ namespace Lidgren.Network
 		[CLSCompliant(false)]
 		public static ulong GetUInt64()
 		{
-#if !__ANDROID__ && !IOS && !UNITY_WEBPLAYER
+#if !__ANDROID__ && !IOS && !UNITY_WEBPLAYER && !UNITY_ANDROID && !UNITY_IPHONE
 			ulong seed = (ulong)System.Diagnostics.Stopwatch.GetTimestamp();
 			seed ^= (ulong)Environment.WorkingSet;
 			ulong s2 = (ulong)Interlocked.Increment(ref m_seedIncrement);

Lidgren.Network/NetUtility.cs

@@ -16,7 +16,7 @@ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRA
 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
-#if !__ANDROID__ && !IOS && !UNITY_WEBPLAYER
+#if !__ANDROID__ && !IOS && !UNITY_WEBPLAYER && !UNITY_ANDROID && !UNITY_IPHONE
 #define IS_FULL_NET_AVAILABLE
 #endif
 
@@ -599,7 +599,7 @@ namespace Lidgren.Network
 		/// </summary>
 		public static byte[] CreateSHA1Hash(string key)
 		{
-			using (var sha = SHA1.Create())
+			using (var sha = new SHA1CryptoServiceProvider())
 				return sha.ComputeHash(Encoding.UTF8.GetBytes(key));
 		}
 
@@ -608,7 +608,7 @@ namespace Lidgren.Network
 		/// </summary>
 		public static byte[] CreateSHA1Hash(byte[] data)
 		{
-			using (var sha = SHA1.Create())
+			using (var sha = new SHA1CryptoServiceProvider())
 				return sha.ComputeHash(data);
 		}
 	}

Samples/LibraryTestSamples/SpeedSample/SpeedClient/SpeedTestClient.csproj

@@ -93,7 +93,6 @@
       <DependentUpon>Resources.resx</DependentUpon>
       <DesignTime>True</DesignTime>
     </Compile>
-    <None Include="app.config" />
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>
       <LastGenOutput>Settings.Designer.cs</LastGenOutput>

Samples/LibraryTestSamples/SpeedSample/SpeedServer/SpeedTestServer.csproj

@@ -95,7 +95,6 @@
       <DependentUpon>Resources.resx</DependentUpon>
       <DesignTime>True</DesignTime>
     </Compile>
-    <None Include="app.config" />
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>
       <LastGenOutput>Settings.Designer.cs</LastGenOutput>