# HG changeset patch
# User Shinji KONO <kono@ie.u-ryukyu.ac.jp>
# Date 1582092130 -32400
# Node ID 82755931810c8ed225da70d6d38d73d51e9cd68d
# Parent  b1ace1c5d37a57f6ca0ce0c6a404e401c6f41d1e
fix

diff -r b1ace1c5d37a -r 82755931810c src/main/java/jp/ac/u_ryukyu/treevnc/BroadcastRFBListener.java
--- a/src/main/java/jp/ac/u_ryukyu/treevnc/BroadcastRFBListener.java	Tue Feb 18 21:47:17 2020 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/treevnc/BroadcastRFBListener.java	Wed Feb 19 15:02:10 2020 +0900
@@ -16,7 +16,7 @@
 
 public class BroadcastRFBListener implements Runnable {
     public static final String Ipv4McastAddr = "224.0.0.1";
-    public static final String Ipv6McastAddr = "ff02::1";
+    public static final String Ipv6McastAddr = "ff02::1"; // we don't have to send IPv6, multicast on IPv4 is enough
     public static String McastAddr = Ipv4McastAddr;
 
 	static final int BufSize = 1024*64;
@@ -24,7 +24,6 @@
 	private boolean stopFlag = false;
 	private TreeRFBProto rfb;
 	private MulticastSocket soc;
-	private SecurityManager securityManager;
 
 	public BroadcastRFBListener() {
 		try {
@@ -42,12 +41,7 @@
 		} catch (SocketException e) {
 			System.out.println("join to " +  Ipv4McastAddr + " failed.");
 		}
-		/*try {
-			soc.joinGroup(InetAddress.getByName(Ipv6McastAddr));
-		} catch (SocketException e) {
-			System.out.println("join to " +  Ipv6McastAddr + " failed.");
-		}*/
-        return soc;
+		return soc;
     }
 
     /**
@@ -74,17 +68,12 @@
 		}
 	}
 
+	/**
+	 * send multicsst frame buffer update
+	 *    the multicast is sent to all network interfaces supporting multicast
+	 * @param buf
+	 */
 	public void multicastUpdateRectangle(ByteBuffer buf) {
-
-		/*try {
-			DatagramPacket sendPacket = new DatagramPacket(buf.array
-					(), buf.limit(), InetAddress.getByName(TreeRootFinderListener.Ipv6McastAddr), ConnectionParams.DEFAULT_VNC_BROADCAST);
-			soc.send(sendPacket);
-		} catch (IOException e) {
-			System.out.println("cannot send UpdateRectangle.");
-			e.printStackTrace();
-		}*/
-
 		try {
 			DatagramPacket sendPacket1 = new DatagramPacket(buf.array(), buf.limit(), InetAddress.getByName(TreeRootFinderListener.Ipv4McastAddr), ConnectionParams.DEFAULT_VNC_BROADCAST);
 			soc.send(sendPacket1);
diff -r b1ace1c5d37a -r 82755931810c src/main/java/jp/ac/u_ryukyu/treevnc/TreeVncCommandChannelListener.java
--- a/src/main/java/jp/ac/u_ryukyu/treevnc/TreeVncCommandChannelListener.java	Tue Feb 18 21:47:17 2020 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/treevnc/TreeVncCommandChannelListener.java	Wed Feb 19 15:02:10 2020 +0900
@@ -112,7 +112,8 @@
             //   or direct TreeVNC Command from lower node
             //   such as LostParent, LostChild
             TreeVncCommand cmd = treeVncCommand(b,is,os,myHostAddress,intf);
-            if (cmd!=null) return cmd;
+            if (cmd!=null)
+                return cmd;
         }
         // normal connection from TreeVNC node candidate
         sendSecurityType(os);