diff options
Diffstat (limited to 'java/com/rsyslog/lib')
-rw-r--r-- | java/com/rsyslog/lib/SyslogSender.java | 96 | ||||
-rw-r--r-- | java/com/rsyslog/lib/UDPSyslogSender.java | 75 |
2 files changed, 171 insertions, 0 deletions
diff --git a/java/com/rsyslog/lib/SyslogSender.java b/java/com/rsyslog/lib/SyslogSender.java new file mode 100644 index 00000000..fc0e3fec --- /dev/null +++ b/java/com/rsyslog/lib/SyslogSender.java @@ -0,0 +1,96 @@ +/** + * This class specifies all methods common to syslog senders. It also implements + * some generic ways to send data. Actual syslog senders (e.g. UDP, TCP, ...) shall + * be derived from this class. + * + * This is a limited-capability implementation of a syslog message together + * with all its properties. It is limit to what is currently needed and may + * be extended as further need arises. + * + * @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; + +public abstract class SyslogSender { + + /** the rawmsg without the PRI part */ + private String target; + + /** the rawmsg without the PRI part */ + private boolean isConnected = false; + + /** Constructs Sender, sets target system. + * @param target the system to connect to. Syntax of target is depending + * on the underlying transport. + */ + public SyslogSender(String target) { + this.target = 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 abstract void sendTransport(String MSG) throws Exception; + + /** send an alread-formatted message. + * Sends a preformatted syslog message payload to the target. Connects + * to the target if not already connected. + * + * @param MSG a validly formatted syslog message as of the RFC (all parts) + * @throws Exception (depending on transport) + */ + public void sendMSG(String MSG) throws Exception { + if(!isConnected) + connect(); + sendTransport(MSG); + } + + /** connect to the target. + * Note that this may be a null operation if there is no session-like entity + * in the underlying transport (as is for example in UDP). + */ + public void connect() throws Exception { + /* the default implementation does (almost) nothing */ + isConnected = true; + } + + /** disconnects from the target. + * Note that this may be a null operation if there is no session-like entity + * in the underlying transport (as is for example in UDP). + */ + public void disconnect() { + /* the default implementation does (almost) nothing */ + isConnected = false; + } + + /** return target of this Sender. + * @returns target as initially set + */ + public String getTarget() { + return target; + } +} diff --git a/java/com/rsyslog/lib/UDPSyslogSender.java b/java/com/rsyslog/lib/UDPSyslogSender.java new file mode 100644 index 00000000..1a2c4726 --- /dev/null +++ b/java/com/rsyslog/lib/UDPSyslogSender.java @@ -0,0 +1,75 @@ +/** + * 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()); + } + +} |