/*
* Created on Jan 18, 2005
* Created by Alon Rohter
* Copyright (C) 2004-2005 Aelitis, All Rights Reserved.
*
* This program 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 2
* of the License, or (at your option) any later version.
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package com.aelitis.azureus.core.networkmanager.impl.tcp;
import java.net.*;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.*;
import org.gudy.azureus2.core3.config.*;
import org.gudy.azureus2.core3.logging.*;
import org.gudy.azureus2.core3.util.*;
import com.aelitis.azureus.core.networkmanager.*;
import com.aelitis.azureus.core.networkmanager.admin.NetworkAdmin;
import com.aelitis.azureus.core.networkmanager.admin.NetworkAdminPropertyChangeListener;
import com.aelitis.azureus.core.networkmanager.impl.IncomingConnectionManager;
import com.aelitis.azureus.core.networkmanager.impl.ProtocolDecoder;
import com.aelitis.azureus.core.networkmanager.impl.TransportHelperFilter;
import com.aelitis.azureus.core.networkmanager.impl.TransportCryptoManager;
/**
* Accepts new incoming socket connections and manages routing of them
* to registered handlers.
*/
public class IncomingSocketChannelManager
{
private static final LogIDs LOGID = LogIDs.NWMAN;
private final String port_config_key;
private final String port_enable_config_key;
private int tcp_listen_port;
private int so_rcvbuf_size = COConfigurationManager.getIntParameter( "network.tcp.socket.SO_RCVBUF" );
private InetAddress default_bind_address = NetworkAdmin.getSingleton().getDefaultBindAddress();
private InetAddress explicit_bind_address;
private boolean explicit_bind_address_set;
private VirtualServerChannelSelector server_selector = null;
private IncomingConnectionManager incoming_manager = IncomingConnectionManager.getSingleton();
protected AEMonitor this_mon = new AEMonitor( "IncomingSocketChannelManager" );
int listen_fail_count = 0;
/**
* Create manager and begin accepting and routing new connections.
*/
public IncomingSocketChannelManager( String _port_config_key, String _port_enable_config_key ) {
port_config_key = _port_config_key;
port_enable_config_key = _port_enable_config_key;
tcp_listen_port = COConfigurationManager.getIntParameter( port_config_key );
//allow dynamic port number changes
COConfigurationManager.addParameterListener( port_config_key, new ParameterListener() {
public void parameterChanged(String parameterName) {
int port = COConfigurationManager.getIntParameter( port_config_key );
if( port != tcp_listen_port ) {
tcp_listen_port = port;
restart();
}
}
});
COConfigurationManager.addParameterListener( port_enable_config_key, new ParameterListener() {
public void parameterChanged(String parameterName) {
restart();
}
});
//allow dynamic receive buffer size changes
COConfigurationManager.addParameterListener( "network.tcp.socket.SO_RCVBUF", new ParameterListener() {
public void parameterChanged(String parameterName) {
int size = COConfigurationManager.getIntParameter( "network.tcp.socket.SO_RCVBUF" );
if( size != so_rcvbuf_size ) {
so_rcvbuf_size = size;
restart();
}
}
});
//allow dynamic bind address changes
NetworkAdmin.getSingleton().addPropertyChangeListener(
new NetworkAdminPropertyChangeListener()
{
public void
propertyChanged(
String property )
{
if ( property == NetworkAdmin.PR_DEFAULT_BIND_ADDRESS ){
InetAddress address = NetworkAdmin.getSingleton().getDefaultBindAddress();
if ( address == null && default_bind_address == null ){
return;
}
if ( address == null || default_bind_address == null || !address.equals( default_bind_address )) {
default_bind_address = address;
restart();
}
}
}
});
//start processing
start();
//run a daemon thread to poll listen port for connectivity
//it seems that sometimes under OSX that listen server sockets sometimes stop accepting incoming connections for some unknown reason
//this checker tests to make sure the listen socket is still accepting connections, and if not, recreates the socket
SimpleTimer.addPeriodicEvent(
"IncomingSocketChannelManager:concheck",
60*1000,
new TimerEventPerformer() {
public void perform( TimerEvent ev ) {
if( server_selector != null && server_selector.isRunning() ) { //ensure it's actually running
long accept_idle = SystemTime.getCurrentTime() - server_selector.getTimeOfLastAccept();
if( accept_idle > 10*60*1000 ) { //the socket server hasn't accepted any new connections in the last 10min
//so manually test the listen port for connectivity
InetAddress inet_address = server_selector.getBoundToAddress();
try{
if( inet_address == null ) inet_address = InetAddress.getByName( "127.0.0.1" ); //failback
Socket sock = new Socket( inet_address, tcp_listen_port, inet_address, 0 );
sock.close();
listen_fail_count = 0;
}
catch( Throwable t ) {
//ok, let's try again without the explicit local bind
try {
Socket sock = new Socket( InetAddress.getByName( "127.0.0.1" ), tcp_listen_port );
sock.close();
listen_fail_count = 0;
}
catch( Throwable x ) {
listen_fail_count++;
Debug.out( new Date()+ ": listen port on [" +inet_address+ ": " +tcp_listen_port+ "] seems CLOSED [" +listen_fail_count+ "x]" );
if( listen_fail_count > 4 ) {
String error = t.getMessage() == null ? "<null>" : t.getMessage();
String msg = "Listen server socket on [" +inet_address+ ": " +tcp_listen_port+ "] does not appear to be accepting inbound connections.\n[" +error+ "]\nAuto-repairing listen service....\n";
Logger.log(new LogAlert(LogAlert.UNREPEATABLE, LogAlert.AT_WARNING, msg));
restart();
listen_fail_count = 0;
}
}
}
}
else { //it's recently accepted an inbound connection
listen_fail_count = 0;
}
}
}
}
);
}
public boolean
isEnabled()
{
return( COConfigurationManager.getBooleanParameter(port_enable_config_key ));
}
/**
* Get port that the TCP server socket is listening for incoming connections on.
* @return port number
*/
public int getTCPListeningPortNumber() { return tcp_listen_port; }
public void
setExplicitBindAddress(
InetAddress address )
{
explicit_bind_address = address;
explicit_bind_address_set = true;
restart();
}
public void
clearExplicitBindAddress()
{
explicit_bind_address = null;
explicit_bind_address_set = false;
restart();
}
protected InetAddress
getEffectiveBindAddress()
{
if ( explicit_bind_address_set ){
return( explicit_bind_address );
}else{
return( default_bind_address );
}
}
public boolean
isEffectiveBindAddress(
InetAddress address )
{
InetAddress effective = getEffectiveBindAddress();
if ( address == null && effective == null ){
return( true );
}
if ( address == null || effective == null ){
return( false );
}
return( address.equals( effective ));
}
private void start() {
try{
this_mon.enter();
if( tcp_listen_port < 0 || tcp_listen_port > 65535 || tcp_listen_port == 6880 ) {
String msg = "Invalid incoming TCP listen port configured, " +tcp_listen_port+ ". Port reset to default. Please check your config!";
Debug.out( msg );
Logger.log(new LogAlert(LogAlert.UNREPEATABLE, LogAlert.AT_ERROR, msg));
tcp_listen_port = RandomUtils.generateRandomNetworkListenPort();
COConfigurationManager.setParameter( port_config_key, tcp_listen_port );
}
if ( COConfigurationManager.getBooleanParameter(port_enable_config_key)){
if( server_selector == null ) {
InetSocketAddress address;
InetAddress bind_address = getEffectiveBindAddress();
if( bind_address != null ) {
address = new InetSocketAddress( bind_address, tcp_listen_port );
}
else {
address = new InetSocketAddress( tcp_listen_port );
}
server_selector = VirtualServerChannelSelectorFactory.createTest( address, so_rcvbuf_size, new VirtualBlockingServerChannelSelector.SelectListener() {
public void newConnectionAccepted( final ServerSocketChannel server, final SocketChannel channel ) {
//check for encrypted transport
final TCPTransportHelper helper = new TCPTransportHelper( channel );
TransportCryptoManager.getSingleton().manageCrypto( helper, null, true, null, new TransportCryptoManager.HandshakeListener() {
public void handshakeSuccess( ProtocolDecoder decoder, ByteBuffer remaining_initial_data ) {
process( server.socket().getLocalPort(), decoder.getFilter());
}
public void
handshakeFailure(
Throwable failure_msg )
{
if (Logger.isEnabled()) Logger.log(new LogEvent(LOGID, "incoming crypto handshake failure: " + Debug.getNestedExceptionMessage( failure_msg )));
/*
// we can have problems with sockets stuck in a TIME_WAIT state if we just
// close an incoming channel - to clear things down properly the client needs
// to initiate the close. So what we do is send some random bytes to the client
// under the assumption this will cause them to close, and we delay our socket close
// for 10 seconds to give them a chance to do so.
try{
Random random = new Random();
byte[] random_bytes = new byte[68+random.nextInt(128-68)];
random.nextBytes( random_bytes );
channel.write( ByteBuffer.wrap( random_bytes ));
}catch( Throwable e ){
// ignore anything here
}
NetworkManager.getSingleton().closeSocketChannel( channel, 10*1000 );
*/
helper.close( "Handshake failure: " + Debug.getNestedExceptionMessage( failure_msg ));
}
public void
gotSecret(
byte[] session_secret )
{
}
public int
getMaximumPlainHeaderLength()
{
return( incoming_manager.getMaxMinMatchBufferSize());
}
public int
matchPlainHeader(
ByteBuffer buffer )
{
Object[] match_data = incoming_manager.checkForMatch( helper, server.socket().getLocalPort(), buffer, true );
if ( match_data == null ){
return( TransportCryptoManager.HandshakeListener.MATCH_NONE );
}else{
IncomingConnectionManager.MatchListener match = (IncomingConnectionManager.MatchListener)match_data[0];
if ( match.autoCryptoFallback()){
return( TransportCryptoManager.HandshakeListener.MATCH_CRYPTO_AUTO_FALLBACK );
}else{
return( TransportCryptoManager.HandshakeListener.MATCH_CRYPTO_NO_AUTO_FALLBACK );
}
}
}
});
}
});
server_selector.start();
}
}else{
Logger.log(new LogEvent(LOGID, "Not starting TCP listener on port " + tcp_listen_port + " as protocol disabled" ));
}
}finally{
this_mon.exit();
}
}
protected void
process(
int local_port,
TransportHelperFilter filter )
{
SocketChannel channel = ((TCPTransportHelper)filter.getHelper()).getSocketChannel();
//set advanced socket options
try {
int so_sndbuf_size = COConfigurationManager.getIntParameter( "network.tcp.socket.SO_SNDBUF" );
if( so_sndbuf_size > 0 ) channel.socket().setSendBufferSize( so_sndbuf_size );
String ip_tos = COConfigurationManager.getStringParameter( "network.tcp.socket.IPTOS" );
if( ip_tos.length() > 0 ) channel.socket().setTrafficClass( Integer.decode( ip_tos ).intValue() );
}
catch( Throwable t ) {
t.printStackTrace();
}
InetSocketAddress tcp_address = new InetSocketAddress( channel.socket().getInetAddress(), channel.socket().getPort());
ConnectionEndpoint co_ep = new ConnectionEndpoint(tcp_address);
ProtocolEndpointTCP pe_tcp = new ProtocolEndpointTCP( co_ep, tcp_address );
Transport transport = new TCPTransportImpl( pe_tcp, filter );
incoming_manager.addConnection( local_port, filter, transport );
}
private void restart() {
try{
this_mon.enter();
if( server_selector != null ) {
server_selector.stop();
server_selector = null;
}
}finally{
this_mon.exit();
}
try{ Thread.sleep( 1000 ); }catch( Throwable t ) { t.printStackTrace(); }
start();
}
}
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