[dubbo] branch 2.7.3-release updated: Fix MulticastSocket setInterface choose an unreachable address (#4426)

[huxing]

This is an automated email from the ASF dual-hosted git repository.

huxing pushed a commit to branch 2.7.3-release
in repository https://gitbox.apache.org/repos/asf/dubbo.git


The following commit(s) were added to refs/heads/2.7.3-release by this push:
     new 3d01797  Fix MulticastSocket setInterface choose an unreachable 
address (#4426)
3d01797 is described below

commit 3d01797afd5616cea1b13e88544c5f9312ba3c70
Author: Shoukai Huang <shou...@users.noreply.github.com>
AuthorDate: Tue Jul 2 17:39:11 2019 +0800

    Fix MulticastSocket setInterface choose an unreachable address (#4426)
---
 .../org/apache/dubbo/common/utils/NetUtils.java    | 24 ++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git 
a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java 
b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java
index 6fd1a4e..bef5183 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/utils/NetUtils.java
@@ -371,13 +371,25 @@ public class NetUtils {
             while (addresses.hasMoreElements()) {
                 InetAddress address = (InetAddress) addresses.nextElement();
                 if (preferIpv6 && address instanceof Inet6Address) {
-                    multicastSocket.setInterface(address);
-                    interfaceSet = true;
-                    break;
+                    try {
+                        if(address.isReachable(100)){
+                            multicastSocket.setInterface(address);
+                            interfaceSet = true;
+                            break;
+                        }
+                    } catch (IOException e) {
+                        // ignore
+                    }
                 } else if (!preferIpv6 && address instanceof Inet4Address) {
-                    multicastSocket.setInterface(address);
-                    interfaceSet = true;
-                    break;
+                    try {
+                        if(address.isReachable(100)){
+                            multicastSocket.setInterface(address);
+                            interfaceSet = true;
+                            break;
+                        }
+                    } catch (IOException e) {
+                        // ignore
+                    }
                 }
             }
             if (interfaceSet) {