/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. licenses this file
* to you 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 com.cloudera.flume.handlers.syslog;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import com.cloudera.flume.conf.Context;
import com.cloudera.flume.conf.SourceFactory.SourceBuilder;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventSource;
import com.cloudera.flume.handlers.text.EventExtractException;
import com.google.common.base.Preconditions;
/**
* First cut at a tcp source listening for tcp-based syslog data. This is only
* good for a single connection.
*
* syslog entries sent over tcp are simply delimited by '\n' characters and are
* otherwise identical in format to udp-based syslog data.
*/
public class SyslogTcpSource extends EventSource.Base {
public final static int SYSLOG_TCP_PORT = 514;
ServerSocket sock = null;
int port = SYSLOG_TCP_PORT; // this is syslog-ng's default tcp port.
DataInputStream is;
long rejects = 0;
public SyslogTcpSource(int port) {
this.port = port;
}
public SyslogTcpSource() {
}
@Override
public void close() throws IOException {
sock.close();
sock = null;
}
@Override
public Event next() throws IOException {
Event e = null;
while (true) {
try {
e = SyslogWireExtractor.extractEvent(is);
updateEventProcessingStats(e);
return e;
} catch (EventExtractException ex) {
rejects++;
}
}
}
@Override
public void open() throws IOException {
Preconditions.checkState(sock == null);
sock = new ServerSocket(port);
Socket client = sock.accept();
is = new DataInputStream(client.getInputStream());
}
public static SourceBuilder builder() {
return new SourceBuilder() {
@Override
public EventSource build(Context ctx, String... argv) {
int port = SYSLOG_TCP_PORT; // default udp port, need root permissions
// for this.
if (argv.length > 1) {
throw new IllegalArgumentException("usage: syslogTcp1([port no]) ");
}
if (argv.length == 1) {
port = Integer.parseInt(argv[0]);
}
return new SyslogTcpSource(port);
}
};
}
}