001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.snmp;
018
019 import org.apache.camel.Exchange;
020 import org.apache.camel.Processor;
021 import org.apache.camel.impl.DefaultConsumer;
022 import org.apache.commons.logging.Log;
023 import org.apache.commons.logging.LogFactory;
024 import org.snmp4j.CommandResponder;
025 import org.snmp4j.CommandResponderEvent;
026 import org.snmp4j.PDU;
027 import org.snmp4j.Snmp;
028 import org.snmp4j.TransportMapping;
029 import org.snmp4j.smi.Address;
030 import org.snmp4j.smi.GenericAddress;
031 import org.snmp4j.smi.UdpAddress;
032 import org.snmp4j.transport.DefaultUdpTransportMapping;
033
034 public class SnmpTrapConsumer extends DefaultConsumer implements CommandResponder {
035
036 private static final Log LOG = LogFactory.getLog(SnmpTrapConsumer.class);
037
038 private SnmpEndpoint endpoint;
039 private Address listenGenericAddress;
040 private Snmp snmp;
041 private TransportMapping transport;
042
043 public SnmpTrapConsumer(SnmpEndpoint endpoint, Processor processor) {
044 super(endpoint, processor);
045 this.endpoint = endpoint;
046 }
047
048 @Override
049 protected void doStart() throws Exception {
050 super.doStart();
051
052 // load connection data only if the endpoint is enabled
053 if (LOG.isInfoEnabled()) {
054 LOG.info("Starting trap consumer on " + this.endpoint.getAddress());
055 }
056 this.listenGenericAddress = GenericAddress.parse(this.endpoint.getAddress());
057 this.transport = new DefaultUdpTransportMapping((UdpAddress)this.listenGenericAddress);
058 this.snmp = new Snmp(transport);
059 this.snmp.addCommandResponder(this);
060
061 // listen to the transport
062 this.transport.listen();
063 }
064
065 @Override
066 protected void doStop() throws Exception {
067 // stop listening to the transport
068 if (this.transport != null && this.transport.isListening()) {
069 if (LOG.isInfoEnabled()) {
070 LOG.info("Stopping trap consumer on " + this.endpoint.getAddress());
071 }
072 this.transport.close();
073 }
074
075 super.doStop();
076 }
077
078 public void processPdu(CommandResponderEvent event) {
079 PDU pdu = event.getPDU();
080 // check PDU not null
081 if (pdu != null) {
082 processPDU(pdu);
083 } else {
084 LOG.debug("Received invalid trap PDU: " + pdu);
085 }
086 }
087
088 public void processPDU(PDU pdu) {
089 if (LOG.isDebugEnabled()) {
090 LOG.debug("Received trap event for " + this.endpoint.getAddress() + " : " + pdu);
091 }
092 Exchange exchange = endpoint.createExchange(pdu);
093 try {
094 getProcessor().process(exchange);
095 } catch (Exception ex) {
096 exchange.setException(ex);
097 }
098 }
099 }