1 files changed, 46 insertions, 0 deletions
diff --git a/src/main/java/com/juick/xmpp/s2s/DNSQueries.java b/src/main/java/com/juick/xmpp/s2s/DNSQueries.java
new file mode 100644
index 00000000..2b2d60e0
--- /dev/null
+++ b/src/main/java/com/juick/xmpp/s2s/DNSQueries.java
@@ -0,0 +1,46 @@
+package com.juick.xmpp.s2s;
+
+import java.net.UnknownHostException;
+import java.util.Hashtable;
+import java.util.Random;
+import javax.naming.NamingException;
+import javax.naming.directory.Attribute;
+import javax.naming.directory.DirContext;
+import javax.naming.directory.InitialDirContext;
+
+/**
+ *
+ * @author ugnich
+ */
+public class DNSQueries {
+
+    private static Random rand = new Random();
+
+    public static HostnamePort getServerAddress(String hostname) throws UnknownHostException {
+
+        String host = hostname;
+        int port = 5269;
+
+        try {
+            Hashtable<String, String> env = new Hashtable<String, String>(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());
+                try {
+                    String srv[] = att.get(i).toString().split(" ");
+                    port = Integer.parseInt(srv[2]);
+                    host = srv[3];
+                } catch (Exception e) {
+                }
+            }
+
+            ctx.close();
+        } catch (NamingException e) {
+        }
+
+        return new HostnamePort(host, port);
+    }
+}