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Efficient, scalable, and flexible Java implementation of the Short Messaging Peer to Peer Protocol (SMPP)
package com.cloudhopper.smpp.impl;
/*
* #%L
* ch-smpp
* %%
* Copyright (C) 2009 - 2012 Cloudhopper by Twitter
* %%
* 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.
* #L%
*/
import com.cloudhopper.smpp.SmppBindType;
import com.cloudhopper.smpp.SmppConstants;
import com.cloudhopper.smpp.SmppSessionConfiguration;
import com.cloudhopper.smpp.channel.ChannelUtil;
import com.cloudhopper.smpp.pdu.BaseBind;
import com.cloudhopper.smpp.pdu.BaseBindResp;
import com.cloudhopper.smpp.pdu.BindReceiver;
import com.cloudhopper.smpp.pdu.BindTransceiver;
import com.cloudhopper.smpp.pdu.BindTransmitter;
import com.cloudhopper.smpp.pdu.Pdu;
import com.cloudhopper.smpp.pdu.PduResponse;
import com.cloudhopper.smpp.type.LoggingOptions;
import com.cloudhopper.smpp.type.SmppChannelException;
import com.cloudhopper.smpp.type.SmppProcessingException;
import java.util.TimerTask;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Handles new channels connected via the SmppServer that are not yet properly
* "bound" (authenticated). An unbound session handles some of the logic to
* authenticate a channel, then do final setups of an SmppSession, and handoff
* a prepared session to a server handler.
*
* @author joelauer (twitter: @jjlauer or http://twitter.com/jjlauer)
*/
public class UnboundSmppSession implements SmppSessionChannelListener {
private static final Logger logger = LoggerFactory.getLogger(UnboundSmppSession.class);
// the channel that's not "bound" yet as an SMPP session
private final String channelName;
private final Channel channel;
private final BindTimeoutTask bindTimeoutTask;
private final DefaultSmppServer server;
public UnboundSmppSession(String channelName, Channel channel, DefaultSmppServer server) {
this.channelName = channelName;
this.channel = channel;
this.server = server;
// schedule the timer to close the channel after X milliseconds
this.bindTimeoutTask = new BindTimeoutTask();
this.server.getBindTimer().schedule(bindTimeoutTask, this.server.getConfiguration().getBindTimeout());
}
// called when a PDU is received and decoded on the channel
@Override
public void firePduReceived(Pdu pdu) {
// always log the PDU received on an unbound session
logger.info("received PDU: {}", pdu);
// only bind requests are permitted
if (!(pdu instanceof BaseBind)) {
logger.warn("Only bind requests are permitted on new connections, closing connection [{}]", channelName);
// FIXME: we could create a response with an error and THEN close the connection...
// cancel the timer task & close connection
closeChannelAndCancelTimer();
return;
}
// delegate any bind request to the server handler
// variables we track for a successful bind request
BaseBind bindRequest = (BaseBind)pdu;
// create a default session configuration based on this bind request
SmppSessionConfiguration sessionConfiguration = createSessionConfiguration(bindRequest);
// assign a new identifier for this session
Long sessionId = server.nextSessionId();
try {
// delegate the bind request upstream to server handler
this.server.bindRequested(sessionId, sessionConfiguration, bindRequest);
} catch (SmppProcessingException e) {
logger.warn("Bind request rejected or failed for connection [{}] with error [{}]", channelName, e.getMessage());
// create a failed bind response and send back to connection
BaseBindResp bindResponse = server.createBindResponse(bindRequest, e.getErrorCode());
this.sendResponsePdu(bindResponse);
// cancel the timer task & close connection
closeChannelAndCancelTimer();
return;
}
// if we got there then 98% "bound" -- we just need to create the
// new session and tie everything together -- cancel the bind timer
this.bindTimeoutTask.cancel();
// prepare an "OK" bind response that the session will send back once flagged as 'serverReady'
BaseBindResp preparedBindResponse = server.createBindResponse(bindRequest, SmppConstants.STATUS_OK);
try {
// create a new a new session and tie the bind response to it
server.createSession(sessionId, channel, sessionConfiguration, preparedBindResponse);
} catch (SmppProcessingException e) {
logger.warn("Bind request was approved, but createSession failed for connection [{}] with error [{}]", channelName, e.getMessage());
// create a failed bind response and send back to connection
BaseBindResp bindResponse = server.createBindResponse(bindRequest, e.getErrorCode());
this.sendResponsePdu(bindResponse);
// cancel the timer task & close connection
closeChannelAndCancelTimer();
return;
}
}
public void closeChannelAndCancelTimer() {
// if the channel is being closed, we should always make sure the timer
// bind task is always cancelled as well
this.bindTimeoutTask.cancel();
// close the channel
this.channel.close();
}
@Override
public void fireExceptionThrown(Throwable t) {
logger.warn("Exception thrown, closing connection [{}]: {}", channelName, t);
closeChannelAndCancelTimer();
}
@Override
public void fireChannelClosed() {
logger.info("Connection closed with [{}]", channelName);
closeChannelAndCancelTimer();
}
protected SmppSessionConfiguration createSessionConfiguration(BaseBind bindRequest) {
SmppSessionConfiguration sessionConfiguration = new SmppSessionConfiguration();
sessionConfiguration.setName("SmppServerSession." + bindRequest.getSystemId() + "." + bindRequest.getSystemType());
sessionConfiguration.setSystemId(bindRequest.getSystemId());
sessionConfiguration.setPassword(bindRequest.getPassword());
sessionConfiguration.setSystemType(bindRequest.getSystemType());
sessionConfiguration.setBindTimeout(server.getConfiguration().getBindTimeout());
sessionConfiguration.setAddressRange(bindRequest.getAddressRange());
sessionConfiguration.setHost(ChannelUtil.getChannelRemoteHost(channel));
sessionConfiguration.setPort(ChannelUtil.getChannelRemotePort(channel));
sessionConfiguration.setInterfaceVersion(bindRequest.getInterfaceVersion());
LoggingOptions loggingOptions = new LoggingOptions();
loggingOptions.setLogPdu(true);
sessionConfiguration.setLoggingOptions(loggingOptions);
// handle all 3 types...
if (bindRequest instanceof BindTransceiver) {
sessionConfiguration.setType(SmppBindType.TRANSCEIVER);
} else if (bindRequest instanceof BindReceiver) {
sessionConfiguration.setType(SmppBindType.RECEIVER);
} else if (bindRequest instanceof BindTransmitter) {
sessionConfiguration.setType(SmppBindType.TRANSMITTER);
}
// new default options set from server config
sessionConfiguration.setWindowSize(server.getConfiguration().getDefaultWindowSize());
sessionConfiguration.setWindowWaitTimeout(server.getConfiguration().getDefaultWindowWaitTimeout());
sessionConfiguration.setWindowMonitorInterval(server.getConfiguration().getDefaultWindowMonitorInterval());
sessionConfiguration.setRequestExpiryTimeout(server.getConfiguration().getDefaultRequestExpiryTimeout());
sessionConfiguration.setCountersEnabled(server.getConfiguration().isDefaultSessionCountersEnabled());
return sessionConfiguration;
}
public void sendResponsePdu(PduResponse pdu) {
try {
// encode the pdu into a buffer
ChannelBuffer buffer = server.getTranscoder().encode(pdu);
// always log the PDU
logger.info("send PDU: {}", pdu);
// write the pdu out & wait till its written
ChannelFuture channelFuture = this.channel.write(buffer).await();
// check if the write was a success
if (!channelFuture.isSuccess()) {
// the write failed, make sure to throw an exception
throw new SmppChannelException(channelFuture.getCause().getMessage(), channelFuture.getCause());
}
} catch (Exception e) {
logger.error("Fatal exception thrown while attempting to send response PDU: {}", e);
}
}
/**
* Simple task that closes a channel if its not bound within a certain time.
*/
private final class BindTimeoutTask extends TimerTask {
@Override
public void run() {
logger.warn("Channel not bound within [{}] ms, closing connection [{}]", server.getConfiguration().getBindTimeout(), channelName);
channel.close();
this.cancel();
server.getCounters().incrementBindTimeoutsAndGet();
}
}
}