// ========================================================================
// Copyright 2011 NEXCOM Systems
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================
package org.cipango.dns.bio;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import org.cipango.dns.AbstractConnector;
import org.cipango.dns.DnsConnection;
import org.cipango.dns.DnsMessage;
import org.eclipse.jetty.io.ByteArrayBuffer;
public class UdpConnector extends AbstractConnector
{
public static final int MAX_PACKET_SIZE = 512;
public DnsConnection newConnection(InetAddress host, int port)
{
return new Connection(host, port);
}
public DatagramSocket newDatagramSocket() throws SocketException
{
return new DatagramSocket(getPort(), getHostAddr());
}
public class Connection implements DnsConnection
{
private InetAddress _remoteAddr;
private int _remotePort;
private DatagramSocket _socket;
public Connection(InetAddress remoteAddr, int remotePort)
{
_remoteAddr = remoteAddr;
_remotePort = remotePort;
}
public void send(DnsMessage message) throws IOException
{
ByteArrayBuffer buffer = new ByteArrayBuffer(MAX_PACKET_SIZE);
message.encode(buffer);
DatagramPacket packet = new DatagramPacket(buffer.asArray(), buffer.length(), _remoteAddr, _remotePort);
_socket = newDatagramSocket();
_socket.send(packet);
}
public DnsMessage waitAnswer(int timeout) throws IOException
{
DatagramPacket packet = new DatagramPacket(new byte[MAX_PACKET_SIZE], MAX_PACKET_SIZE);
_socket.setSoTimeout(timeout);
_socket.receive(packet);
DnsMessage message = new DnsMessage();
message.decode(new ByteArrayBuffer(packet.getData()));
_socket.close();
return message;
}
public DatagramSocket getSocket()
{
return _socket;
}
}
}