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/**
* A UDP transport implementation of a syslog sender.
*
* Note that there is an anomaly in this version of the code: we query the remote system
* address only once during the connection setup and resue it. If we potentially run for
* an extended period of time, the remote address may change, what we do not reflect. For
* the current use case, this is acceptable, but if this code is put into more wide-spread
* use outside of debugging, a periodic requery should be added.
*
* @author Rainer Gerhards
*
* Copyright 2009 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rsyslog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Rsyslog. If not, see http://www.gnu.org/licenses/.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
package com.rsyslog.lib;
import java.net.*;
public class UDPSyslogSender extends SyslogSender {
private final int port = 514; // TODO: take from target!
private InetAddress targetAddr;
/** the socket to communicate over with the remote system. */
private DatagramSocket sock;
/** Constructs Sender, sets target system.
* @param target the system to connect to. Syntax of target is depending
* on the underlying transport.
*/
public UDPSyslogSender(String target) throws Exception {
super(target);
}
/** send a message on the wire.
* This needs a complete formatted message, which will be extended by
* the transport framing, if necessary.
*
* @param MSG a validly formatted syslog message as of the RFC (all parts)
* @throws Exception (depending on transport)
*/
protected void sendTransport(String MSG) throws Exception {
byte msg[] = MSG.getBytes();
DatagramPacket pkt = new DatagramPacket(msg, msg.length, targetAddr, port);
sock.send(pkt);
}
/** connect to the target.
* For UDP, this means we create the socket.
*/
public void connect() throws Exception {
super.connect();
sock = new DatagramSocket();
// TODO: we should extract the actual hostname & port!
targetAddr = InetAddress.getByName(getTarget());
}
}
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