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com.sshtools.synergy.nio.SshEngine Maven / Gradle / Ivy
package com.sshtools.synergy.nio;
/*-
* #%L
* Common API
* %%
* Copyright (C) 2002 - 2024 JADAPTIVE Limited
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 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 Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CopyOnWriteArrayList;
import com.sshtools.common.events.Event;
import com.sshtools.common.events.EventCodes;
import com.sshtools.common.events.EventServiceImplementation;
import com.sshtools.common.logger.Log;
import com.sshtools.common.logger.Log.Level;
import com.sshtools.common.net.HttpRequest;
import com.sshtools.common.net.HttpResponse;
import com.sshtools.common.ssh.AbstractRequestFuture;
import com.sshtools.common.ssh.ChannelRequestFuture;
import com.sshtools.common.ssh.ConnectionAwareTask;
import com.sshtools.common.ssh.SshException;
import com.sshtools.common.util.ByteArrayWriter;
import com.sshtools.common.util.Utils;
import com.sshtools.synergy.ssh.Connection;
/**
* This class provides an abstract daemon for servicing any number of protocol
* contexts.
*/
public class SshEngine {
static SshEngine defaultInstance = null;
SshEngineContext context;
SelectorThreadPool acceptThreads;
SelectorThreadPool connectThreads;
SelectorThreadPool transferThreads;
Map acceptors = new ConcurrentHashMap(50, 0.9f, 1);
Thread shutdownHook;
boolean started;
boolean isStarting = false;
boolean startupRequiresListeningInterfaces = false;
List listeningInterfaces = Collections.synchronizedList(new ArrayList());
ConcurrentLinkedQueue shutdownHooks = new ConcurrentLinkedQueue();
Throwable lastError = null;
AbstractRequestFuture shutdownFuture = new ChannelRequestFuture();
Object lock = new Object();
List listeners = new CopyOnWriteArrayList();
final protected static char[] hexArray = "0123456789abcdef".toCharArray();
private final static String[] SOCKSV5_ERROR = {
"Success", "General SOCKS server failure",
"Connection not allowed by ruleset", "Network unreachable",
"Host unreachable", "Connection refused", "TTL expired",
"Command not supported", "Address type not supported"
};
private final static String[] SOCKSV4_ERROR = {
"Request rejected or failed",
"SOCKS server cannot connect to identd on the client",
"The client program and identd report different user-ids"
};
private static final int SOCKS4 = 0x04;
private static final int SOCKS5 = 0x05;
private static final int CONNECT = 0x01;
private static final int NULL_TERMINATION = 0x00;
/**
* Constructs the Daemon.
*/
public SshEngine() {
context = new SshEngineContext(this);
}
/**
* Get the context for this Daemon.
*
* @return DaemonContext
*/
public SshEngineContext getContext() {
return context;
}
private static String version = PomVersion.getVersion();
public Throwable getLastError() {
return lastError;
}
public void addListener(SshEngineListener listener) {
listeners.add(listener);
}
public void removeListener(SshEngineListener listener) {
listeners.remove(listener);
}
/**
* Returns the current version of the API.
*
* @returns the current version in the form MAJOR.MINOR.BUILD
*/
public static String getVersion() {
return version;
}
/**
* Returns the release date of the current version.
*
* @returns the release date of the current version.
*/
public static Date getReleaseDate() {
return new Date(1726841576261L);
}
public boolean isStarting() {
return isStarting;
}
public void addShutdownHook(Runnable r) {
shutdownHooks.add(r);
}
protected int getIntValue(Properties properties, String overrideKey, int defaultValue) {
if(properties.containsKey(overrideKey)) {
try {
return Integer.parseInt(properties.getProperty(overrideKey));
} catch (NumberFormatException e) {
}
}
return defaultValue;
}
protected boolean getBooleanValue(Properties properties, String overrideKey, boolean defaultValue) {
if(properties.containsKey(overrideKey)) {
try {
return Boolean.parseBoolean(properties.getProperty(overrideKey));
} catch (NumberFormatException e) {
}
}
return defaultValue;
}
protected long getLongValue(Properties properties, String overrideKey, long defaultValue) {
if(properties.containsKey(overrideKey)) {
try {
return Long.parseLong(properties.getProperty(overrideKey));
} catch (NumberFormatException e) {
}
}
return defaultValue;
}
/**
* Starts the daemon, first calling the
* {@link #configure(ConfigurationContext)} method to allow your server to
* configure itself.
*
* @throws IOException
* @return true if at least one interface started, otherwise
* false .
*/
public boolean startup() throws IOException {
synchronized(lock) {
return startup(System.getProperties());
}
}
public boolean startup(Properties properties) throws IOException {
synchronized(lock) {
isStarting = true;
lastError = null;
try {
for(SshEngineListener listener : listeners) {
listener.starting(this);
}
shutdownHook = new Thread() {
public void run() {
if(Log.isInfoEnabled())
Log.info("The system is shutting down");
shutdownNow(false, getLongValue(properties,
"maverick.config.shutdown.defaultGracePeriod", 5000L));
}
};
if(Log.isInfoEnabled()) {
Log.info("Product version: " + version);
Log.info("Java version: "
+ System.getProperty("java.version"));
Log.info("OS: " + System.getProperty("os.name") + " " + System.getProperty("os.arch"));
Log.info("Configuring SSH engine");
}
if(Log.isInfoEnabled())
Log.info("Configuration complete");
if (Runtime.getRuntime() != null)
Runtime.getRuntime().addShutdownHook(shutdownHook);
connectThreads = new SelectorThreadPool(
new ConnectSelectorThread(),
getIntValue(properties, "maverick.config.connect.threads", context.getPermanentConnectThreads()),
getIntValue(properties, "maverick.config.channelsPerThread", context.getMaximumChannelsPerThread()),
getIntValue(properties, "maverick.config.idlePeriod", context.getIdleServiceRunPeriod()),
getIntValue(properties, "maverick.config.idleEvents", context.getInactiveServiceRunsPerIdleEvent()),
context.getSelectorProvider());
transferThreads = new SelectorThreadPool(
new TransferSelectorThread(),
getIntValue(properties, "maverick.config.transfer.threads", context.getPermanentTransferThreads()),
getIntValue(properties, "maverick.config.channelsPerThread", context.getMaximumChannelsPerThread()),
getIntValue(properties, "maverick.config.idlePeriod", context.getIdleServiceRunPeriod()),
getIntValue(properties, "maverick.config.idleEvents", context.getInactiveServiceRunsPerIdleEvent()),
context.getSelectorProvider());
acceptThreads = new SelectorThreadPool(new AcceptSelectorThread(),
getIntValue(properties, "maverick.config.accept.threads", context.getPermanentAcceptThreads()),
getIntValue(properties, "maverick.config.channelsPerThread", context.getMaximumChannelsPerThread()),
getIntValue(properties, "maverick.config.idlePeriod", context.getIdleServiceRunPeriod()),
getIntValue(properties, "maverick.config.idleEvents", context.getInactiveServiceRunsPerIdleEvent()),
context.getSelectorProvider());
ListeningInterface[] interfaces = context.getListeningInterfaces();
int listening = 0;
for (int i = 0; i < interfaces.length; i++) {
if (startListeningInterface(interfaces[i]))
listening++;
}
if (listening == 0 && startupRequiresListeningInterfaces) {
if(Log.isInfoEnabled())
Log.info("No listening interfaces were bound!");
shutdownNow(false, 0);
return false;
}
started = true;
for(SshEngineListener listener : listeners) {
listener.started(this);
}
if(getBooleanValue(properties, "maverick.threadDump", false)) {
new Thread("ThreadMonitor") {
public void run() {
while(isStarted()) {
try {
Thread.sleep(getLongValue(properties, "maverick.threadDumpInterval", 300000L));
} catch (InterruptedException e) {
}
Log.raw(Level.INFO, Utils.generateThreadDump(), true);
}
}
}.start();
}
return true;
} catch (Throwable ex) {
if(Log.isInfoEnabled())
Log.info("The engine failed to start", ex);
lastError = ex;
shutdownNow(false, 0);
if (ex instanceof LicenseException)
throw (IOException) ex;
return false;
} finally {
isStarting = false;
}
}
}
protected boolean startListeningInterface(ListeningInterface li) {
if(Log.isInfoEnabled())
Log.info("Binding server to "
+ li.getAddressToBind().toString());
try {
ServerSocketChannel socketChannel = context.getSelectorProvider()
.openServerSocketChannel();
socketChannel.configureBlocking(false);
socketChannel.socket().setReuseAddress(
li.getSocketOptionReuseAddress());
ServerSocket socket = socketChannel.socket();
socket.bind(li.getAddressToBind(), li.getBacklog());
li.setActualPort(socket.getLocalPort());
socket.setReuseAddress(li.getSocketOptionReuseAddress());
ProtocolClientAcceptor a = new ProtocolClientAcceptor(li,
socketChannel);
registerAcceptor(a, socketChannel);
acceptors.put(li.getAddressToBind().toString(), a);
for(SshEngineListener listener : listeners) {
listener.interfaceStarted(this, li);
}
listeningInterfaces.add(li);
return true;
} catch (IOException ex) {
if(Log.isInfoEnabled())
Log.info("Failed to bind to "
+ li.getAddressToBind().toString(), ex);
try {
context.removeListeningInterface(li.getAddressToBind().getAddress().getHostAddress(), li.getActualPort());
} catch (UnknownHostException e) {
}
lastError = ex;
for(SshEngineListener listener : listeners) {
listener.interfaceCannotStart(this, li, ex);
}
return false;
}
}
public void removeAcceptor(ListeningInterface li) {
if(Log.isInfoEnabled())
Log.info("Removing interface " + li.getAddressToBind().toString());
ProtocolClientAcceptor a = acceptors.remove(li
.getAddressToBind().toString());
try {
if (a != null) {
a.stopAccepting();
}
listeningInterfaces.remove(li);
for(SshEngineListener listener : listeners) {
listener.interfaceStopped(this, li);
}
} catch(IOException ex) {
for(SshEngineListener listener : listeners) {
listener.interfaceCannotStop(this, li, ex);
}
}
}
/**
* Get whether the daemon is currently started
*
* @return started
*/
public boolean isStarted() {
return started;
}
/**
* Shutdown the server. This does not exit the JVM
*/
public void shutdownAsync(final boolean graceful, final long forceAfterMs) {
Thread t = new Thread() {
public void run() {
shutdownNow(graceful, forceAfterMs);
}
};
t.start();
}
/**
* This method should be used to shutdown the server from your main thread. If you need to shutdown
* the server from within a session that is running on a transfer thread use {@link shutdownAsync().}
*/
public void shutdownNow(boolean graceful, long forceAfterMs) {
synchronized(lock) {
try {
for(SshEngineListener listener : listeners) {
listener.shuttingDown(this);
}
// Stop accepting new connections
if (acceptThreads != null)
acceptThreads.shutdown();
for(ListeningInterface li : listeningInterfaces) {
for(SshEngineListener listener : listeners) {
listener.interfaceStopped(this, li);
}
}
listeningInterfaces.clear();
if(graceful) {
long started = System.currentTimeMillis();
while (transferThreads.getCurrentLoad() > 0) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
if (forceAfterMs > 0
&& System.currentTimeMillis() - started > forceAfterMs)
break;
}
}
// First close the channels whilst maintaining I/O
if(transferThreads!=null) {
transferThreads.closeAllChannels();
}
try {
if (Runtime.getRuntime() != null && shutdownHook!=null)
Runtime.getRuntime().removeShutdownHook(shutdownHook);
} catch (IllegalStateException ex) {
} finally {
shutdownHook = null;
for(SshEngineListener listener : listeners) {
listener.shutdown(this);
}
}
// Run any shutdown hooks
if(shutdownHooks!=null) {
for(Runnable r : shutdownHooks) {
try {
r.run();
} catch (Exception e) {
}
}
}
if (connectThreads != null)
connectThreads.shutdown();
if (transferThreads != null)
transferThreads.shutdown();
} finally {
started = false;
shutdownFuture.done(true);
}
}
}
public void shutdownAndExit() {
shutdownNow(false, 0L);
Log.getDefaultContext().shutdown();
}
public void restart() throws IOException {
restart(false, 0);
}
public void restart(boolean graceful, long forceAfterMs) throws IOException {
shutdownNow(graceful, forceAfterMs);
startup();
}
public ConnectRequestFuture connect(String hostToConnect, int portToConnect, K protocolContext) throws SshException, IOException {
SocketChannel socketChannel = SocketChannel.open();
socketChannel.configureBlocking(true);
socketChannel.socket().setTcpNoDelay(true);
final ConnectRequestFuture future;
boolean connected;
switch(protocolContext.getProxyType()) {
case NONE:
future = new ConnectRequestFuture(hostToConnect, portToConnect);
connected = socketChannel.connect(new InetSocketAddress(hostToConnect, portToConnect));
break;
default:
future = new ConnectRequestFuture(protocolContext.getProxyHostname(), protocolContext.getProxyPort());
connected = socketChannel.connect(new InetSocketAddress(protocolContext.getProxyHostname(), protocolContext.getProxyPort()));
}
if(connected) {
processOpenSocket(socketChannel, protocolContext, hostToConnect, portToConnect);
socketChannel.configureBlocking(false);
registerClientConnection(protocolContext, socketChannel, future);
} else {
// Register the connector and we will confirm once we have connected
registerConnector(new DaemonClientConnector(protocolContext, socketChannel, future, hostToConnect, portToConnect), socketChannel);
}
return future;
}
private void sendHTTPProxyRequest(SocketChannel channel, ProtocolContext protocolContext, String hostToConnect, int portToConnect) throws UnsupportedEncodingException, IOException {
if(Log.isDebugEnabled()) {
Log.debug("Connecting via HTTP proxy {}:{}", protocolContext.getProxyHostname(), protocolContext.getProxyPort());
}
HttpRequest request = new HttpRequest();
request.setHeaderBegin("CONNECT "
+ hostToConnect
+ ":"
+ portToConnect
+ " HTTP/1.0");
request.setHeaderField("User-Agent", Utils.defaultString(protocolContext.getUserAgent(), "MaverickSynergy/" + version));
request.setHeaderField("Pragma", "No-Cache");
request.setHeaderField("Host", protocolContext.getProxyHostname());
request.setHeaderField("Proxy-Connection", "Keep-Alive");
if(Utils.isNotBlank(protocolContext.getProxyUsername()) && !Utils.isNotBlank(protocolContext.getProxyPassword())) {
request.setBasicAuthentication(protocolContext.getProxyUsername(), protocolContext.getProxyPassword());
}
channel.write(ByteBuffer.wrap(request.toString().getBytes("UTF-8")));
ByteBuffer buf = ByteBuffer.allocate(4096);
int count;
do {
count = channel.read(buf);
} while(count > -1 && !isHTTPResponseComplete(buf));
HttpResponse resp = new HttpResponse();
buf.flip();
resp.process(buf);
if(resp.getStatus()!=200) {
throw new IOException("Invalid HTTP proxy response! " + resp.getStartLine());
}
}
private boolean isHTTPResponseComplete(ByteBuffer buf) {
buf.flip();
boolean eol = false;
if(buf.remaining() > 4) {
eol = buf.get(buf.remaining()-4) == '\r'
&& buf.get(buf.remaining()-3) == '\n'
&& buf.get(buf.remaining()-2) == '\r'
&& buf.get(buf.remaining()-1) == '\n';
}
buf.compact();
return eol;
}
protected SocketChannel processOpenSocket(SocketChannel socketChannel, ProtocolContext protocolContext,
String hostToConnect, int portToConnect) throws UnsupportedEncodingException, IOException {
switch(protocolContext.getProxyType()) {
case HTTP:
sendHTTPProxyRequest(socketChannel, protocolContext, hostToConnect, portToConnect);
break;
case SOCKS4:
sendSOCKS4ProxyRequest(socketChannel, protocolContext, hostToConnect, portToConnect);
break;
case SOCKS5:
sendSOCKS5ProxyRequest(socketChannel, protocolContext, hostToConnect, portToConnect);
break;
default:
break;
}
return socketChannel;
}
private int readByte(SocketChannel channel) throws IOException {
ByteBuffer b = ByteBuffer.allocate(1);
int r = channel.read(b);
if(r == -1) {
throw new IOException("Socket disconnected whilst expecting data");
}
if(r == 0) {
throw new IOException("Unexecpted zero bytes returned from socket");
}
return b.get(0) & 0xFF;
}
private void sendSOCKS4ProxyRequest(SocketChannel socketChannel, ProtocolContext protocolContext,
String hostToConnect, int portToConnect) throws IOException {
if(Log.isDebugEnabled()) {
Log.debug("Connecting via SOCKS4 proxy {}:{}", protocolContext.getProxyHostname(), protocolContext.getProxyPort());
}
InetAddress hostAddr = InetAddress.getByName(hostToConnect);
ByteBuffer buf = ByteBuffer.allocate(1024);
buf.put((byte)SOCKS4);
buf.put((byte)CONNECT);
buf.put((byte)((portToConnect >>> 8) & 0xff));
buf.put((byte)(portToConnect & 0xff));
buf.put(hostAddr.getAddress());
buf.put(protocolContext.getProxyUsername().getBytes("UTF-8"));
buf.put((byte)NULL_TERMINATION);
buf.flip();
socketChannel.write(buf);
int res = readByte(socketChannel);
if (res != 0x00) {
throw new IOException("Invalid response from SOCKS4 server (" +
res + ") " + protocolContext.getProxyHostname() + ":" + protocolContext.getProxyPort());
}
int code = readByte(socketChannel);
if (code != 90) {
if ((code > 90) && (code < 93)) {
throw new IOException(
"SOCKS4 server unable to connect, reason: " +
SOCKSV4_ERROR[code - 91]);
}
throw new IOException(
"SOCKS4 server unable to connect, reason: " + code);
}
ByteBuffer data = ByteBuffer.allocate(6);
int c = 0;
while(c < 6) {
int r = socketChannel.read(data);
if(r > 0) {
c+= r;
}
}
}
private void sendSOCKS5ProxyRequest(SocketChannel socketChannel, ProtocolContext protocolContext,
String hostToConnect, int portToConnect) throws IOException {
if(Log.isDebugEnabled()) {
Log.debug("Connecting via SOCKS5 proxy {}:{}", protocolContext.getProxyHostname(), protocolContext.getProxyPort());
}
byte[] request = {
(byte) SOCKS5, (byte) 0x02, (byte) 0x00, (byte) 0x02
};
socketChannel.write(ByteBuffer.wrap(request));
int res = readByte(socketChannel);
if (res != 0x05) {
throw new IOException("Invalid response from SOCKS5 server (" +
res + ") " + protocolContext.getProxyHostname() + ":" +
protocolContext.getProxyPort());
}
int method = readByte(socketChannel);
switch (method) {
case 0x00:
break;
case 0x02:
try(ByteArrayWriter baw = new ByteArrayWriter()) {
baw.write(0x01);
byte[] h = protocolContext.getProxyUsername().getBytes("UTF-8");
baw.write(h.length);
baw.write(h);
h = protocolContext.getProxyPassword().getBytes("UTF-8");
baw.write(h.length);
baw.write(h);
socketChannel.write(ByteBuffer.wrap(baw.toByteArray()));
}
res = readByte(socketChannel);
if ((res != 0x01) && (res != 0x05)) {
throw new IOException("Invalid response from SOCKS5 server (" +
res + ") " + protocolContext.getProxyHostname() + ":" + protocolContext.getProxyPort());
}
if (readByte(socketChannel) != 0x00) {
throw new IOException("Invalid username/password for SOCKS5 server");
}
break;
default:
throw new IOException(
"SOCKS5 server does not support our authentication methods");
}
try(ByteArrayWriter baw = new ByteArrayWriter()) {
if (protocolContext.isResolveLocally()) {
InetAddress hostAddr;
try {
hostAddr = InetAddress.getByName(hostToConnect);
} catch (UnknownHostException e) {
throw new IOException("Can't do local lookup on: " +
hostToConnect + ", try socks5 without local lookup");
}
request = new byte[] {
(byte) SOCKS5, (byte) 0x01, (byte) 0x00, (byte) 0x01
};
baw.write(request);
baw.write(hostAddr.getAddress());
} else {
request = new byte[] {
(byte) SOCKS5, (byte) 0x01, (byte) 0x00, (byte) 0x03
};
baw.write(request);
byte[] h = hostToConnect.getBytes("UTF-8");
baw.write(h.length);
baw.write(h);
}
baw.write((portToConnect >>> 8) & 0xff);
baw.write(portToConnect & 0xff);
socketChannel.write(ByteBuffer.wrap(baw.toByteArray()));
}
res = readByte(socketChannel);
if (res != 0x05) {
throw new IOException("Invalid response from SOCKS5 server (" +
res + ") " + protocolContext.getProxyHostname() + ":" + protocolContext.getProxyPort());
}
int status = readByte(socketChannel);
if (status != 0x00) {
if ((status > 0) && (status < 9)) {
throw new IOException(
"SOCKS5 server unable to connect, reason: " +
SOCKSV5_ERROR[status]);
}
throw new IOException(
"SOCKS5 server unable to connect, reason: " + status);
}
readByte(socketChannel);
int aType = readByte(socketChannel);
switch (aType) {
case 0x01:
socketChannel.read(ByteBuffer.allocate(4));
break;
case 0x03:
int n = readByte(socketChannel);
socketChannel.read(ByteBuffer.allocate(n));
break;
default:
throw new IOException("SOCKS5 gave unsupported address type: " +
aType);
}
if(socketChannel.read(ByteBuffer.allocate(2)) != 2) {
throw new IOException("SOCKS5 error reading port");
}
}
public boolean isStartupRequiresListeningInterfaces() {
return startupRequiresListeningInterfaces;
}
public void setStartupRequiresListeningInterfaces(boolean startupRequiresListeningInterfaces) {
this.startupRequiresListeningInterfaces = startupRequiresListeningInterfaces;
}
private ProtocolEngine registerClientConnection(K protocolContext, SocketChannel socketChannel, ConnectRequestFuture connectFuture) throws IOException {
SocketHandler connection = protocolContext.getSocketConnectionFactory().createSocketConnection(
context,
socketChannel.socket().getLocalSocketAddress(),
socketChannel.socket().getRemoteSocketAddress());
ProtocolEngine engine = protocolContext.createEngine(connectFuture);
connection.initialize(engine, SshEngine.this, socketChannel);
registerHandler(connection, socketChannel);
return engine;
}
/**
* Register a client connector with the daemon.
*
* @param connector
* ClientConnector
* @param socketChannel
* SocketChannel
* @throws IOException
*/
public void registerConnector(ClientConnector connector,
SocketChannel socketChannel) throws IOException {
SelectorThread t = connectThreads.selectNextThread();
t.register(socketChannel, SelectionKey.OP_CONNECT, connector, true);
}
/**
* Register a client acceptor with the daemon.
*
* @param acceptor
* ClientAcceptor
* @param socketChannel
* ServerSocketChannel
* @throws IOException
*/
public void registerAcceptor(ClientAcceptor acceptor,
ServerSocketChannel socketChannel) throws IOException {
acceptThreads.register(socketChannel, SelectionKey.OP_ACCEPT, acceptor, true);
}
/**
* Register a socket handler with the daemon.
*
* @param handler
* SocketHandler
* @param channel
* SelectableChannel
* @throws IOException
*/
public void registerHandler(SocketHandler handler, SelectableChannel channel)
throws IOException {
SelectorThread t = transferThreads.selectNextThread();
registerHandler(handler, channel, t);
}
/**
* Register a socket handler with the daemon.
*
* @param handler
* SocketHandler
* @param channel
* SelectableChannel
* @param thread
* SelectorThread
* @throws IOException
*/
public void registerHandler(SocketHandler handler,
SelectableChannel channel, SelectorThread thread)
throws IOException {
handler.setThread(thread);
if (thread == null)
throw new IOException("Unable to allocate thread");
thread.register(channel, handler.getInitialOps(), handler, true);
}
class AcceptSelectorThread implements SelectorThreadImpl {
public void processSelectionKey(SelectionKey key, SelectorThread thread) {
ClientAcceptor acceptor = (ClientAcceptor) key.attachment();
if(Log.isTraceEnabled())
Log.trace(context.getBufferPool().getAllocatedBuffers()
+ " direct buffers allocated, "
+ context.getBufferPool().getFreeBuffers() + " free");
acceptor.finishAccept(key);
}
public String getName() {
return context.getProduct() + "-ACCEPT";
}
}
class TransferSelectorThread implements SelectorThreadImpl {
public void processSelectionKey(final SelectionKey key, SelectorThread t) {
SocketHandler listener = (SocketHandler) key.attachment();
if (key != null && key.isValid()) {
key.interestOps(0);
if(Log.isTraceEnabled()) {
Log.trace("Processing {}{}{}", listener.getName(),
key.isReadable() ? " READ" : "", key.isWritable() ? " WRITE" : "");
}
listener.addTask(new SocketReadWriteTask(listener.getConnection(), key, listener));
}
}
public String getName() {
return context.getProduct() + "-TRANSFER";
}
}
class SocketReadWriteTask extends ConnectionAwareTask {
SocketHandler listener;
SelectionKey key;
SocketReadWriteTask(Connection con, SelectionKey key, SocketHandler listener) {
super(con);
this.key = key;
this.listener = listener;
}
public void doTask() {
boolean cancel = false;
if (key.isValid() && key.isWritable()) {
if(Log.isTraceEnabled()) {
Log.trace("Starting {} WRITE", listener.getName());
}
cancel = listener.processWriteEvent();
}
if (key.isValid() && key.isReadable()) {
if(Log.isTraceEnabled()) {
Log.trace("Starting {} READ", listener.getName());
}
cancel |= listener.processReadEvent();
}
if(cancel) {
key.cancel();
} else {
listener.getSelectorThread().addSelectorOperation(new Runnable() {
public void run() {
if(key.isValid()) {
int ops = 0;
boolean wantsWrite = listener.wantsWrite();
boolean wantsRead = listener.wantsRead();
if(wantsWrite) {
ops |= SelectionKey.OP_WRITE;
}
if(wantsRead) {
ops |= SelectionKey.OP_READ;
}
if(Log.isTraceEnabled()) {
Log.trace("{} has state ops={} {}",
listener.getName(),
ops,
wantsWrite && wantsRead ? "READ/WRITE" : wantsWrite ? "WRITE" : wantsRead ? "READ" : "NONE");
}
key.interestOps(ops);
}
}
});
}
}
}
class ConnectSelectorThread implements SelectorThreadImpl {
public void processSelectionKey(SelectionKey key, SelectorThread thread) {
ClientConnector con = (ClientConnector) key.attachment();
if(con.finishConnect(key)) {
key.cancel();
}
}
public String getName() {
return context.getProduct() + "-CONNECT";
}
}
class DaemonClientConnector implements ClientConnector {
ProtocolContext protocolContext;
SocketChannel socketChannel;
ProtocolEngine engine;
ConnectRequestFuture connectFuture;
String hostToConnect;
int portToConnect;
DaemonClientConnector(ProtocolContext protocolContext, SocketChannel socketChannel, ConnectRequestFuture connectFuture,
String hostToConnect, int portToConnect) {
this.protocolContext = protocolContext;
this.socketChannel = socketChannel;
this.connectFuture = connectFuture;
this.hostToConnect = hostToConnect;
this.portToConnect = portToConnect;
}
public void registrationCompleted(SelectableChannel channel,
SelectionKey key, SelectorThread selectorThread) {
}
public boolean finishConnect(SelectionKey key) {
try {
while (!socketChannel.finishConnect()) {
// Wait for the connection to complete
}
processOpenSocket(socketChannel, protocolContext, hostToConnect, portToConnect);
engine = registerClientConnection(protocolContext, socketChannel, connectFuture);
return true;
} catch (Exception e) {
Log.error("Failed to connect socket", e);
return false;
} finally {
key.cancel();
}
}
}
class ProtocolClientAcceptor extends ClientAcceptor {
ServerSocketChannel socketChannel;
ListeningInterface li;
ProtocolClientAcceptor(ListeningInterface li,
ServerSocketChannel socketChannel) {
super(li);
this.li = li;
this.socketChannel = socketChannel;
}
public boolean finishAccept(SelectionKey key,
ListeningInterface li) {
SocketChannel sc = null;
boolean registered = false;
try {
EventServiceImplementation.getInstance().fireEvent(
(new Event(this, EventCodes.EVENT_CONNECTION_ATTEMPT,
true)).addAttribute(EventCodes.ATTRIBUTE_IP,
((ServerSocketChannel) key.channel()).socket()
.getInetAddress().getHostAddress()));
sc = ((ServerSocketChannel) key.channel()).accept();
if (sc != null) {
ProtocolContext protocolContext = li.getContextFactory().createContext(context, sc);
sc.socket().setKeepAlive(
protocolContext.getSocketOptionKeepAlive());
sc.socket().setTcpNoDelay(
protocolContext.getSocketOptionTcpNoDelay());
if(protocolContext.getSendBufferSize() > 0) {
sc.socket().setSendBufferSize(
protocolContext.getSendBufferSize());
}
if(protocolContext.getReceiveBufferSize() > 0) {
sc.socket().setReceiveBufferSize(
protocolContext.getReceiveBufferSize());
}
sc.configureBlocking(false);
if(Log.isWarnEnabled() && protocolContext.getReceiveBufferSize() > 0) {
if(sc.socket().getReceiveBufferSize()!=protocolContext.getReceiveBufferSize()) {
Log.warn("WARNING: TCP receive buffer could not be set to "
+ protocolContext.getReceiveBufferSize()
+ ". The socket reported a size of "
+ sc.socket().getReceiveBufferSize());
}
}
if(Log.isWarnEnabled() && protocolContext.getSendBufferSize() > 0) {
if(sc.socket().getSendBufferSize()!=protocolContext.getSendBufferSize()) {
Log.warn("WARNING: TCP send buffer could not be set to "
+ protocolContext.getSendBufferSize()
+ ". The socket reported a size of "
+ sc.socket().getSendBufferSize());
}
}
SocketHandler connection = protocolContext.getSocketConnectionFactory().createSocketConnection(
context,
sc.socket().getLocalSocketAddress(),
sc.socket().getRemoteSocketAddress());
ProtocolEngine e = protocolContext.createEngine(new ConnectRequestFuture());
connection.initialize(e, SshEngine.this, sc);
registerHandler(connection, sc);
registered = true;
return !((ServerSocketChannel) key.channel()).isOpen();
} else {
if(Log.isInfoEnabled())
Log.info("Accept event fired but no socket was accepted");
return true;
}
} catch (Throwable ex) {
if(Log.isInfoEnabled())
Log.info("SSH client acceptor failed to accept", ex);
if (sc != null && !registered) {
try {
sc.close();
} catch (IOException e) {
}
try {
sc.socket().close();
} catch (IOException e) {
}
}
return !((ServerSocketChannel) key.channel()).isOpen();
}
}
public void stopAccepting() throws IOException {
socketChannel.close();
}
}
public static SshEngine getDefaultInstance() throws IOException {
synchronized(SshEngine.class) {
if(defaultInstance==null) {
defaultInstance = new SshEngine();
if(!defaultInstance.startup()) {
throw new IOException("Failed to start SSH engine");
}
Runtime.getRuntime().addShutdownHook(new Thread() {
public void run() {
defaultInstance.shutdownNow(false, 0L);
}
});
return defaultInstance;
}
if(!defaultInstance.isStarted()) {
defaultInstance.startup();
}
return defaultInstance;
}
}
public AbstractRequestFuture getShutdownFuture() {
return shutdownFuture;
}
}
