OF-1123 Respond to incoming streams with the right domain

Openfire previously would respond to all incoming domains with the IM domain,
this patch examines and validates the "to" attribute on inbound streams and
responds accordingly.

src/java/org/jivesoftware/openfire/session/LocalIncomingServerSession.java

@@ -112,7 +112,12 @@ public class LocalIncomingServerSession extends LocalServerSession implements In
                 
         String version = xpp.getAttributeValue("", "version");
         String fromDomain = xpp.getAttributeValue("", "from");
+        String toDomain = xpp.getAttributeValue("", "to");
         int[] serverVersion = version != null ? decodeVersion(version) : new int[] {0,0};
+
+        if (toDomain == null) {
+            toDomain = serverName;
+        }
         
         try {
             // Get the stream ID for the new session
@@ -127,7 +132,7 @@ public class LocalIncomingServerSession extends LocalServerSession implements In
             openingStream.append(" xmlns:db=\"jabber:server:dialback\"");
             openingStream.append(" xmlns:stream=\"http://etherx.jabber.org/streams\"");
             openingStream.append(" xmlns=\"jabber:server\"");
-            openingStream.append(" from=\"").append(serverName).append("\"");
+            openingStream.append(" from=\"").append(toDomain).append("\"");
             if (fromDomain != null) {
                 openingStream.append(" to=\"").append(fromDomain).append("\"");
             }