From 865d0da0aa2a0caeee2bdfb0a2a6d1c059913f1e Mon Sep 17 00:00:00 2001
From: Ziver Koc <ziver@koc.se>
Date: Wed, 10 Aug 2016 16:56:42 +0200
Subject: [PATCH] Initial MDNS API

---
 src/zutil/net/dns/DNSResolutionListener.java | 29 ++++++++++++++++
 src/zutil/net/dns/MulticastDNSClient.java    | 35 +++++++++++++++++---
 2 files changed, 60 insertions(+), 4 deletions(-)
 create mode 100755 src/zutil/net/dns/DNSResolutionListener.java

diff --git a/src/zutil/net/dns/DNSResolutionListener.java b/src/zutil/net/dns/DNSResolutionListener.java
new file mode 100755
index 0000000..61930d7
--- /dev/null
+++ b/src/zutil/net/dns/DNSResolutionListener.java
@@ -0,0 +1,29 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Ziver Koc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package zutil.net.dns;
+
+
+public interface DNSResolutionListener{
+        void receivedResponse(DNSPacket packet);
+    }
\ No newline at end of file
diff --git a/src/zutil/net/dns/MulticastDNSClient.java b/src/zutil/net/dns/MulticastDNSClient.java
index a82b333..1958347 100755
--- a/src/zutil/net/dns/MulticastDNSClient.java
+++ b/src/zutil/net/dns/MulticastDNSClient.java
@@ -37,6 +37,9 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.net.DatagramPacket;
 import java.net.InetAddress;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -53,13 +56,24 @@ public class MulticastDNSClient extends ThreadedUDPNetwork implements ThreadedUD
     private static final int    MDNS_MULTICAST_PORT = 5353;
 
 
+    private HashMap<String,List<String>> activeProbes;
+    private DNSResolutionListener listener;
+
+
     public MulticastDNSClient() throws IOException {
         super(MDNS_MULTICAST_ADDR, MDNS_MULTICAST_PORT);
         setThread( this );
+
+        this.activeProbes = new HashMap<>();
+    }
+
+    public void setListener(DNSResolutionListener listener){
+        this.listener = listener;
     }
 
 
-    public void sendProbe(String service) throws IOException {
+    public void sendProbe(String domain) throws IOException {
+        activeProbes.put(domain, new ArrayList<String>());
         ByteArrayOutputStream buffer = new ByteArrayOutputStream();
         BinaryStructOutputStream out = new BinaryStructOutputStream(buffer);
 
@@ -67,7 +81,7 @@ public class MulticastDNSClient extends ThreadedUDPNetwork implements ThreadedUD
         dnsPacket.getHeader().id = (int)(Math.random() * 0xFFFF);
         dnsPacket.getHeader().setDefaultQueryData();
         dnsPacket.addQuestion(new DNSPacketQuestion(
-                service,
+                domain,
                 DNSPacketQuestion.QTYPE_A,
                 DNSPacketQuestion.QCLASS_IN));
         dnsPacket.write(out);
@@ -77,7 +91,7 @@ public class MulticastDNSClient extends ThreadedUDPNetwork implements ThreadedUD
                 InetAddress.getByName( MDNS_MULTICAST_ADDR ),
                 MDNS_MULTICAST_PORT );
 
-        System.out.println("#### Sending Request");
+        logger.fine("Sending MDSN probe for domain: " + domain);
         System.out.println(ByteUtil.toFormattedString(udpPacket.getData(), udpPacket.getOffset(), udpPacket.getLength()));
         MultiPrintStream.out.dump(dnsPacket,3);
 
@@ -92,11 +106,24 @@ public class MulticastDNSClient extends ThreadedUDPNetwork implements ThreadedUD
             BinaryStructInputStream in = new BinaryStructInputStream(buffer);
             DNSPacket dnsPacket = DNSPacket.read(in);
 
-            System.out.println("#### Received response from "+packet.getAddress());
             System.out.println(ByteUtil.toFormattedString(packet.getData(), packet.getOffset(), packet.getLength()));
             MultiPrintStream.out.dump(dnsPacket,3);
+
+            if (dnsPacket.getHeader().flagQueryResponse && dnsPacket.getHeader().countAnswerRecord > 0) {
+                String domain = null;
+                if (domain != null && activeProbes.containsKey(domain)){
+                    List<String> list = activeProbes.get(domain);
+                    if (!list.contains(domain)){
+                        logger.fine("Received MDSN response from: "+packet.getAddress()+", domain: " + domain);
+                        list.add(domain);
+                        if (listener != null)
+                            listener.receivedResponse(dnsPacket);
+                    }
+                }
+            }
         } catch (IOException e){
             logger.log(Level.WARNING, null, e);
         }
     }
+
 }