From f248bf75d1f11e6833bac85046ce6ee56009705a Mon Sep 17 00:00:00 2001
From: Anton Keks <anton@azib.net>
Date: Tue, 26 Aug 2014 00:12:33 +0300
Subject: [PATCH] trying to manually implement mdns

---
 .../ipscan/fetchers/HostnameFetcherTest.java  | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/test/net/azib/ipscan/fetchers/HostnameFetcherTest.java b/test/net/azib/ipscan/fetchers/HostnameFetcherTest.java
index db7673c9..9671db4f 100644
--- a/test/net/azib/ipscan/fetchers/HostnameFetcherTest.java
+++ b/test/net/azib/ipscan/fetchers/HostnameFetcherTest.java
@@ -7,6 +7,11 @@ import net.azib.ipscan.core.ScanningSubject;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 
@@ -41,4 +46,38 @@ public class HostnameFetcherTest extends AbstractFetcherTestCase {
 		if (inexistentAddress.getHostName().equals("192.168.253.253"))
 			assertNull(fetcher.scan(new ScanningSubject(inexistentAddress)));			
 	}
+
+	void writeName(DataOutputStream out, String name) throws IOException {
+		int s = 0, e = 0;
+		while ((e = name.indexOf('.', s)) != -1) {
+			out.writeByte(e - s);
+			out.write(name.substring(s, e).getBytes());
+			s = e + 1;
+		}
+		out.write(name.length() - s);
+		out.write(name.substring(s).getBytes());
+		out.writeByte(0);
+	}
+
+	@Test
+	public void ownHostname() throws Exception {
+		DatagramSocket mdns = new DatagramSocket();
+		mdns.setSoTimeout(3000);
+
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		DataOutputStream out = new DataOutputStream(baos);
+		out.write(new byte[] {0x17, 0x57, 1, 0x20, 0, 1, 0, 0, 0, 0, 0, 1});
+		writeName(out, "2.0.168.192.in-addr.arpa");
+//		out.write("\u00012\u00010\u0003168\u0003192\u0007in-addr\u0004arpa".getBytes());
+		out.write(new byte[] {0, 0xc, 0, 1});
+		out.write(new byte[] {0, 0, 0x29, 0x10, 0, 0, 0, 0, 0, 0, 0});
+		DatagramPacket query = new DatagramPacket(baos.toByteArray(), baos.toByteArray().length, InetAddress.getByName("224.0.0.251"), 5353);
+		mdns.send(query);
+
+		DatagramPacket resp = new DatagramPacket(new byte[512], 512);
+		mdns.receive(resp);
+		byte[] data = resp.getData();
+		int offset = query.getLength() - 11 + 12 + 1;
+		System.out.println(new String(data, offset, resp.getLength() - offset - 1));
+	}
 }