Add support for IPv6-only hosts

moonlight-common/src/main/java/com/limelight/nvstream/http/ComputerDetails.java

@@ -42,7 +42,8 @@ public class ComputerDetails {
 		if (details.activeAddress != null) {
 			this.activeAddress = details.activeAddress;
 		}
-		if (details.localAddress != null) {
+		// We can get IPv4 loopback addresses with GS IPv6 Forwarder
+		if (details.localAddress != null && !details.localAddress.startsWith("127.")) {
 			this.localAddress = details.localAddress;
 		}
 		if (details.remoteAddress != null) {

moonlight-common/src/main/java/com/limelight/nvstream/mdns/MdnsComputer.java

@@ -1,16 +1,16 @@
 package com.limelight.nvstream.mdns;
 
-import java.net.Inet4Address;
 import java.net.Inet6Address;
+import java.net.InetAddress;
 
 public class MdnsComputer {
-	private Inet4Address v4Addr;
+	private InetAddress localAddr;
 	private Inet6Address v6Addr;
 	private String name;
 
-	public MdnsComputer(String name, Inet4Address v4Addr, Inet6Address v6Addr) {
+	public MdnsComputer(String name, InetAddress localAddress, Inet6Address v6Addr) {
 		this.name = name;
-		this.v4Addr = v4Addr;
+		this.localAddr = localAddress;
 		this.v6Addr = v6Addr;
 	}
 
@@ -18,11 +18,11 @@ public class MdnsComputer {
 		return name;
 	}
 
-	public Inet4Address getAddressV4() {
-		return v4Addr;
+	public InetAddress getLocalAddress() {
+		return localAddr;
 	}
 
-	public Inet6Address getAddressV6() {
+	public Inet6Address getIpv6Address() {
 		return v6Addr;
 	}
 
@@ -40,9 +40,9 @@ public class MdnsComputer {
 				return false;
 			}
 
-			if ((other.v4Addr != null && v4Addr == null) ||
-					(other.v4Addr == null && v4Addr != null) ||
-					(other.v4Addr != null && !other.v4Addr.equals(v4Addr))) {
+			if ((other.localAddr != null && localAddr == null) ||
+					(other.localAddr == null && localAddr != null) ||
+					(other.localAddr != null && !other.localAddr.equals(localAddr))) {
 				return false;
 			}
 
@@ -60,6 +60,6 @@ public class MdnsComputer {
 
 	@Override
 	public String toString() {
-		return "["+name+" - "+v4Addr+" - "+v6Addr+"]";
+		return "["+name+" - "+localAddr+" - "+v6Addr+"]";
 	}
 }

moonlight-common/src/main/java/com/limelight/nvstream/mdns/MdnsDiscoveryAgent.java

@@ -160,6 +160,20 @@ public class MdnsDiscoveryAgent implements ServiceListener {
 		}
 	}
 
+	private Inet6Address getLocalAddress(Inet6Address[] addresses) {
+		for (Inet6Address addr : addresses) {
+			if (addr.isLinkLocalAddress() || addr.isSiteLocalAddress()) {
+				return addr;
+			}
+			// fc00::/7 - ULAs
+			else if ((addr.getAddress()[0] & 0xfe) == 0xfc) {
+				return addr;
+			}
+		}
+
+		return null;
+	}
+
 	private Inet6Address getLinkLocalAddress(Inet6Address[] addresses) {
 		for (Inet6Address addr : addresses) {
 			if (addr.isLinkLocalAddress()) {
@@ -247,7 +261,7 @@ public class MdnsDiscoveryAgent implements ServiceListener {
 		for (Inet4Address v4Addr : v4Addrs) {
 			synchronized (computers) {
 				MdnsComputer computer = new MdnsComputer(info.getName(), v4Addr, v6GlobalAddr);
-				if (computers.put(computer.getAddressV4(), computer) == null) {
+				if (computers.put(computer.getLocalAddress(), computer) == null) {
 					// This was a new entry
 					listener.notifyComputerAdded(computer);
 				}
@@ -256,25 +270,16 @@ public class MdnsDiscoveryAgent implements ServiceListener {
 
 		// If there were no IPv4 addresses, use IPv6 for registration
 		if (v4Addrs.length == 0) {
-			// Prefer a global address
-			if (v6GlobalAddr != null) {
-				MdnsComputer computer = new MdnsComputer(info.getName(), null, v6GlobalAddr);
-				if (computers.put(computer.getAddressV6(), computer) == null) {
+			Inet6Address v6LocalAddr = getLocalAddress(v6Addrs);
+
+			if (v6LocalAddr != null || v6GlobalAddr != null) {
+				MdnsComputer computer = new MdnsComputer(info.getName(), v6LocalAddr, v6GlobalAddr);
+				if (computers.put(v6LocalAddr != null ?
+						computer.getLocalAddress() : computer.getIpv6Address(), computer) == null) {
 					// This was a new entry
 					listener.notifyComputerAdded(computer);
 				}
 			}
-			else {
-				// Use link-local if we have no other option
-				Inet6Address v6LinkLocalAddr = getLinkLocalAddress(v6Addrs);
-				if (v6LinkLocalAddr != null) {
-					MdnsComputer computer = new MdnsComputer(info.getName(), null, v6LinkLocalAddr);
-					if (computers.put(computer.getAddressV6(), computer) == null) {
-						// This was a new entry
-						listener.notifyComputerAdded(computer);
-					}
-				}
-			}
 		}
 	}