From 4e3b2b1f110843f639b6060b9bd7cdee35868dc7 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Mon, 23 Jan 2017 22:15:51 +0300
Subject: juick-xmpp: fallback to A record when SRV record is not found

---
 .../java/com/juick/components/s2s/DNSQueries.java  | 28 ++++++++++++++--------
 1 file changed, 18 insertions(+), 10 deletions(-)

(limited to 'juick-xmpp/src/main/java/com/juick/components/s2s')

diff --git a/juick-xmpp/src/main/java/com/juick/components/s2s/DNSQueries.java b/juick-xmpp/src/main/java/com/juick/components/s2s/DNSQueries.java
index 887dfc5c..ea4585a1 100644
--- a/juick-xmpp/src/main/java/com/juick/components/s2s/DNSQueries.java
+++ b/juick-xmpp/src/main/java/com/juick/components/s2s/DNSQueries.java
@@ -1,6 +1,8 @@
 package com.juick.components.s2s;
 
 import org.apache.commons.lang3.math.NumberUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.net.InetSocketAddress;
 import java.net.UnknownHostException;
@@ -17,25 +19,31 @@ import javax.naming.directory.InitialDirContext;
  */
 public class DNSQueries {
 
+    private static final Logger logger = LoggerFactory.getLogger(DNSQueries.class);
+
     private static Random rand = new Random();
 
-    public static InetSocketAddress getServerAddress(String hostname) throws UnknownHostException, NamingException {
+    public static InetSocketAddress getServerAddress(String hostname) {
 
         String host = hostname;
         int port = 5269;
 
         Hashtable<String, String> env = new Hashtable<>(5);
         env.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");
-        DirContext ctx = new InitialDirContext(env);
-        Attribute att = ctx.getAttributes("_xmpp-server._tcp." + hostname, new String[]{"SRV"}).get("SRV");
-
-        if (att != null && att.size() > 0) {
-            int i = rand.nextInt(att.size());
-            String srv[] = att.get(i).toString().split(" ");
-            port = NumberUtils.toInt(srv[2], 5269);
-            host = srv[3];
+        try {
+            DirContext ctx = new InitialDirContext(env);
+            Attribute att = ctx.getAttributes("_xmpp-server._tcp." + hostname, new String[]{"SRV"}).get("SRV");
+
+            if (att != null && att.size() > 0) {
+                int i = rand.nextInt(att.size());
+                String srv[] = att.get(i).toString().split(" ");
+                port = NumberUtils.toInt(srv[2], 5269);
+                host = srv[3];
+            }
+            ctx.close();
+        } catch (NamingException e) {
+            logger.info("SRV record for {} is not resolved, falling back to A record", hostname);
         }
-        ctx.close();
         return new InetSocketAddress(host, port);
     }
 }
-- 
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