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trying to manually implement mdns

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This commit is contained in:
Anton Keks 2014-08-26 00:12:33 +03:00
parent 0e85825caa
commit f248bf75d1
1 changed files with 39 additions and 0 deletions
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39
test/net/azib/ipscan/fetchers/HostnameFetcherTest.java
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@ -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));
}
}