Merge pull request #984 from Unity-Technologies/unity-master-fix-socket-getcheckedips

Fix issue where no addresses will be returned for an address family of unspecified FB1045497

Author: mderoy

mcs/class/System/System.Net.Sockets/Socket.cs

@@ -1160,19 +1160,24 @@ bool GetCheckedIPs (SocketAsyncEventArgs e, out IPAddress [] addresses)
 			// while skipping entries that do not match the address family
 			DnsEndPoint dep = e.RemoteEndPoint as DnsEndPoint;
 			if (dep != null) {
-				var possibleAddresses = Dns.GetHostAddresses (dep.Host);
-				var numberOfAddresses = 0;
-				int[] addressIndices = new int[possibleAddresses.Length];
-				for (var i = 0; i < possibleAddresses.Length; i++) {
-					if (possibleAddresses[i].AddressFamily == dep.AddressFamily) {
-						addressIndices[numberOfAddresses] = i;
-						numberOfAddresses++;
+				if (dep.AddressFamily == AddressFamily.Unspecified)
+				{
+					addresses = Dns.GetHostAddresses(dep.Host);
+				} else {
+					var possibleAddresses = Dns.GetHostAddresses (dep.Host);
+					var numberOfAddresses = 0;
+					int[] addressIndices = new int[possibleAddresses.Length];
+					for (var i = 0; i < possibleAddresses.Length; i++) {
+						if (possibleAddresses[i].AddressFamily == dep.AddressFamily) {
+							addressIndices[numberOfAddresses] = i;
+							numberOfAddresses++;
+						}
 					}
-				}
-				addresses = new IPAddress[numberOfAddresses];
-				for (var i = 0; i < numberOfAddresses; i++)
-					addresses[i] = possibleAddresses[addressIndices[i]];
 
+					addresses = new IPAddress[numberOfAddresses];
+					for (var i = 0; i < numberOfAddresses; i++)
+						addresses[i] = possibleAddresses[addressIndices[i]];
+				}
 				return true;
 			} else {
 				e.ConnectByNameError = null;