[trivial-commits] SF.net SVN: trivial: [92] trunk/eclipse/bonjour/src/MCListen.java

[<jlg...@us...>]

Revision: 92
          http://trivial.svn.sourceforge.net/trivial/?rev=92&view=rev
Author:   jlgeering
Date:     2007-03-08 05:06:34 -0800 (Thu, 08 Mar 2007)

Log Message:
-----------
Better mDNS debug.

Modified Paths:
--------------
    trunk/eclipse/bonjour/src/MCListen.java

Modified: trunk/eclipse/bonjour/src/MCListen.java
===================================================================
--- trunk/eclipse/bonjour/src/MCListen.java	2007-03-07 16:12:24 UTC (rev 91)
+++ trunk/eclipse/bonjour/src/MCListen.java	2007-03-08 13:06:34 UTC (rev 92)
@@ -6,7 +6,9 @@
 import java.net.MulticastSocket;
 import java.net.UnknownHostException;
 
+import org.xbill.DNS.Flags;
 import org.xbill.DNS.Message;
+import org.xbill.DNS.Section;
 
 public class MCListen {
 
@@ -19,14 +21,51 @@
 			group = InetAddress.getByName("224.0.0.251");
 			MulticastSocket s = new MulticastSocket(5353);
 			s.joinGroup(group);
-//			System.out.println(s.getNetworkInterface().getName());
 			byte[] buf = new byte[60000];
 			DatagramPacket recv = new DatagramPacket(buf, buf.length);
 			while (true) {
 				s.receive(recv);
 				Message m = new Message(recv.getData());
-//				DNSIncoming truc = new DNSIncoming(recv);
-				System.out.println(m);
+				String from = recv.getAddress().getHostAddress() + ":" + recv.getPort();
+				// 20.11 RCODE (Response Code)
+				//   In both multicast query and multicast response messages, the Response
+				//   Code MUST be zero on transmission. Multicast DNS messages received
+				//   with non-zero Response Codes MUST be silently ignored.
+				if (m.getHeader().getRcode() != 0) {
+					continue;
+				}
+				// 20.3 OPCODE
+				//   In both multicast query and multicast response messages, MUST be zero
+				//   (only standard queries are currently supported over multicast, unless
+				//   other queries are allowed by future IETF Standards Action).
+				if (m.getHeader().getOpcode() != 0) {
+					System.err.println("OPCODE must be zero.");
+					continue;
+				}
+				// 20.2 QR (Query/Response) Bit
+				//   In query messages, MUST be zero.
+				//   In response messages, MUST be one.
+				if (m.getHeader().getFlag(Flags.QR)) {
+					// Response
+					System.out.println("RESPONSE from " + from);
+					// Multicast DNS Responses MUST NOT contain any questions in the
+					// Question Section. Any questions in the Question Section of a received
+					// Multicast DNS Response MUST be silently ignored. Multicast DNS
+					// Queriers receiving Multicast DNS Responses do not care what question
+					// elicited the response; they care only that the information in the
+					// response is true and accurate.
+					if (m.getSectionArray(Section.QUESTION).length > 0) {
+						// Only for debugging:
+						System.err.println("Response contains questions !");
+					}
+					System.out.println(m.sectionToString(Section.ANSWER));
+				}
+				else {
+					// Query
+					System.out.println("QUERY from " + from);
+					System.out.println(m.sectionToString(Section.QUESTION));
+					System.out.println(m.sectionToString(Section.ANSWER));
+				}
 				System.out.println("----------------------------------------------------------------------------------------------------------------------------------------------------------");
 				recv.setLength(buf.length);
 			}


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