forked from I2P_Developers/i2p.i2p
387 lines
15 KiB
Java
387 lines
15 KiB
Java
/* I2PTunnel is GPL'ed (with the exception mentioned in I2PTunnel.java)
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* (c) 2003 - 2004 mihi
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*/
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package net.i2p.i2ptunnel;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InterruptedIOException;
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import java.io.OutputStream;
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import java.net.Socket;
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import java.net.SocketException;
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import java.util.HashMap;
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import java.util.List;
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import net.i2p.I2PAppContext;
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import net.i2p.client.streaming.I2PSocket;
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import net.i2p.data.ByteArray;
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import net.i2p.util.ByteCache;
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import net.i2p.util.Clock;
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import net.i2p.util.I2PAppThread;
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import net.i2p.util.Log;
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public class I2PTunnelRunner extends I2PAppThread implements I2PSocket.SocketErrorListener {
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protected final Log _log;
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private static volatile long __runnerId;
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private final long _runnerId;
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/**
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* max bytes streamed in a packet - smaller ones might be filled
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* up to this size. Larger ones are not split (at least not on
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* Sun's impl of BufferedOutputStream), but that is the streaming
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* api's job...
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*/
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static int MAX_PACKET_SIZE = 1024 * 4;
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static final int NETWORK_BUFFER_SIZE = MAX_PACKET_SIZE;
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private final Socket s;
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private final I2PSocket i2ps;
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private final Object slock, finishLock = new Object();
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boolean finished = false;
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private final byte[] initialI2PData;
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private final byte[] initialSocketData;
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/** when the last data was sent/received (or -1 if never) */
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private long lastActivityOn;
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/** when the runner started up */
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private final long startedOn;
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private final List<I2PSocket> sockList;
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/** if we die before receiving any data, run this job */
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private final Runnable onTimeout;
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private long totalSent;
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private long totalReceived;
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private volatile long __forwarderId;
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public I2PTunnelRunner(Socket s, I2PSocket i2ps, Object slock, byte[] initialI2PData,
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List<I2PSocket> sockList) {
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this(s, i2ps, slock, initialI2PData, null, sockList, null);
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}
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public I2PTunnelRunner(Socket s, I2PSocket i2ps, Object slock, byte[] initialI2PData,
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byte[] initialSocketData, List<I2PSocket> sockList) {
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this(s, i2ps, slock, initialI2PData, initialSocketData, sockList, null);
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}
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public I2PTunnelRunner(Socket s, I2PSocket i2ps, Object slock, byte[] initialI2PData,
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List<I2PSocket> sockList, Runnable onTimeout) {
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this(s, i2ps, slock, initialI2PData, null, sockList, onTimeout);
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}
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/**
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* Starts itself
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*
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* @param slock the socket lock, non-null
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* @param initialI2PData may be null
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* @param initialSocketData may be null
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* @param sockList may be null. Caller must add i2ps to the list! It will be removed here on completion.
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* Will synchronize on slock when removing.
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* @param onTimeout may be null
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*/
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public I2PTunnelRunner(Socket s, I2PSocket i2ps, Object slock, byte[] initialI2PData,
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byte[] initialSocketData, List<I2PSocket> sockList, Runnable onTimeout) {
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this.sockList = sockList;
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this.s = s;
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this.i2ps = i2ps;
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this.slock = slock;
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this.initialI2PData = initialI2PData;
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this.initialSocketData = initialSocketData;
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this.onTimeout = onTimeout;
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lastActivityOn = -1;
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startedOn = Clock.getInstance().now();
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_log = I2PAppContext.getGlobalContext().logManager().getLog(getClass());
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if (_log.shouldLog(Log.INFO))
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_log.info("I2PTunnelRunner started");
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_runnerId = ++__runnerId;
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__forwarderId = i2ps.hashCode();
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setName("I2PTunnelRunner " + _runnerId);
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start();
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}
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/**
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* have we closed at least one (if not both) of the streams
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* [aka we're done running the streams]?
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*
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* @deprecated unused
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*/
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public boolean isFinished() {
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return finished;
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}
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/**
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* When was the last data for this runner sent or received?
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*
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* @return date (ms since the epoch), or -1 if no data has been transferred yet
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* @deprecated unused
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*/
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public long getLastActivityOn() {
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return lastActivityOn;
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}
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private void updateActivity() {
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lastActivityOn = Clock.getInstance().now();
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}
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/**
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* When this runner started up transferring data
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*
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*/
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public long getStartedOn() {
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return startedOn;
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}
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protected InputStream getSocketIn() throws IOException { return s.getInputStream(); }
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protected OutputStream getSocketOut() throws IOException { return s.getOutputStream(); }
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@Override
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public void run() {
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try {
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InputStream in = getSocketIn();
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OutputStream out = getSocketOut(); // = new BufferedOutputStream(s.getOutputStream(), NETWORK_BUFFER_SIZE);
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i2ps.setSocketErrorListener(this);
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InputStream i2pin = i2ps.getInputStream();
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OutputStream i2pout = i2ps.getOutputStream(); //new BufferedOutputStream(i2ps.getOutputStream(), MAX_PACKET_SIZE);
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if (initialI2PData != null) {
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synchronized (slock) {
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// this does not increment totalSent
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i2pout.write(initialI2PData);
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// do NOT flush here, it will block and then onTimeout.run() won't happen on fail.
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// But if we don't flush, then we have to wait for the connectDelay timer to fire
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// in i2p socket? To be researched and/or fixed.
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//
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// AS OF 0.8.1, MessageOutputStream.flush() is fixed to only wait for accept,
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// not for "completion" (i.e. an ACK from the far end).
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// So we now get a fast return from flush(), and can do it here to save 250 ms.
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// To make sure we are under the initial window size and don't hang waiting for accept,
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// only flush if it fits in one message.
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if (initialI2PData.length <= 1730) // ConnectionOptions.DEFAULT_MAX_MESSAGE_SIZE
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i2pout.flush();
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}
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}
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if (initialSocketData != null) {
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// this does not increment totalReceived
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out.write(initialSocketData);
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}
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if (_log.shouldLog(Log.DEBUG))
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_log.debug("Initial data " + (initialI2PData != null ? initialI2PData.length : 0)
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+ " written to I2P, " + (initialSocketData != null ? initialSocketData.length : 0)
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+ " written to the socket, starting forwarders");
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Thread t1 = new StreamForwarder(in, i2pout, true);
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Thread t2 = new StreamForwarder(i2pin, out, false);
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synchronized (finishLock) {
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while (!finished) {
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finishLock.wait();
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}
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}
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if (_log.shouldLog(Log.DEBUG))
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_log.debug("At least one forwarder completed, closing and joining");
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// this task is useful for the httpclient
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if (onTimeout != null) {
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if (_log.shouldLog(Log.DEBUG))
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_log.debug("runner has a timeout job, totalReceived = " + totalReceived
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+ " totalSent = " + totalSent + " job = " + onTimeout);
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// should we only look at totalReceived?
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if ( (totalSent <= 0) && (totalReceived <= 0) )
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onTimeout.run();
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}
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// now one connection is dead - kill the other as well, after making sure we flush
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close(out, in, i2pout, i2pin, s, i2ps, t1, t2);
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} catch (InterruptedException ex) {
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if (_log.shouldLog(Log.ERROR))
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_log.error("Interrupted", ex);
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} catch (IOException ex) {
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if (_log.shouldLog(Log.DEBUG))
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_log.debug("Error forwarding", ex);
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} catch (Exception e) {
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if (_log.shouldLog(Log.ERROR))
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_log.error("Internal error", e);
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} finally {
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removeRef();
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try {
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if (s != null)
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s.close();
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} catch (IOException ex) {
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if (_log.shouldLog(Log.WARN))
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_log.warn("Could not close java socket", ex);
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}
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if (i2ps != null) {
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try {
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i2ps.close();
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} catch (IOException ex) {
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if (_log.shouldLog(Log.WARN))
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_log.warn("Could not close I2PSocket", ex);
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}
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i2ps.setSocketErrorListener(null);
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}
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}
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}
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protected void close(OutputStream out, InputStream in, OutputStream i2pout, InputStream i2pin,
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Socket s, I2PSocket i2ps, Thread t1, Thread t2) throws InterruptedException, IOException {
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try {
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out.flush();
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} catch (IOException ioe) {
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// ignore
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}
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try {
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i2pout.flush();
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} catch (IOException ioe) {
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// ignore
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}
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try {
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in.close();
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} catch (IOException ioe) {
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// ignore
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}
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try {
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i2pin.close();
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} catch (IOException ioe) {
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// ignore
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}
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// ok, yeah, there's a race here in theory, if data comes in after flushing and before
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// closing, but its better than before...
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try {
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s.close();
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} catch (IOException ioe) {
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// ignore
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}
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try {
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i2ps.close();
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} catch (IOException ioe) {
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// ignore
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}
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t1.join(30*1000);
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t2.join(30*1000);
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}
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public void errorOccurred() {
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synchronized (finishLock) {
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finished = true;
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finishLock.notifyAll();
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}
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}
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private void removeRef() {
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if (sockList != null) {
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synchronized (slock) {
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sockList.remove(i2ps);
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}
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}
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}
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private class StreamForwarder extends I2PAppThread {
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private final InputStream in;
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private final OutputStream out;
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private final String direction;
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private final boolean _toI2P;
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private final ByteCache _cache;
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private StreamForwarder(InputStream in, OutputStream out, boolean toI2P) {
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this.in = in;
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this.out = out;
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_toI2P = toI2P;
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direction = (toI2P ? "toI2P" : "fromI2P");
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_cache = ByteCache.getInstance(32, NETWORK_BUFFER_SIZE);
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setName("StreamForwarder " + _runnerId + "." + (++__forwarderId));
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start();
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}
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@Override
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public void run() {
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String from = i2ps.getThisDestination().calculateHash().toBase64().substring(0,6);
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String to = i2ps.getPeerDestination().calculateHash().toBase64().substring(0,6);
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if (_log.shouldLog(Log.DEBUG)) {
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_log.debug(direction + ": Forwarding between "
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+ from + " and " + to);
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}
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// boo, hiss! shouldn't need this - the streaming lib should be configurable, but
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// somehow the inactivity timer is sometimes failing to get triggered properly
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//i2ps.setReadTimeout(2*60*1000);
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ByteArray ba = _cache.acquire();
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byte[] buffer = ba.getData(); // new byte[NETWORK_BUFFER_SIZE];
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try {
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int len;
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while ((len = in.read(buffer)) != -1) {
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out.write(buffer, 0, len);
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if (_toI2P)
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totalSent += len;
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else
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totalReceived += len;
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if (len > 0) updateActivity();
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if (in.available() == 0) {
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//if (_log.shouldLog(Log.DEBUG))
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// _log.debug("Flushing after sending " + len + " bytes through");
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if (_log.shouldLog(Log.DEBUG))
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_log.debug(direction + ": " + len + " bytes flushed through " + (_toI2P ? "to " : "from ")
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+ i2ps.getPeerDestination().calculateHash().toBase64().substring(0,6));
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try {
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Thread.sleep(I2PTunnel.PACKET_DELAY);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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if (in.available() <= 0)
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out.flush(); // make sure the data get though
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}
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}
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//out.flush(); // close() flushes
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} catch (SocketException ex) {
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// this *will* occur when the other threads closes the socket
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synchronized (finishLock) {
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if (!finished) {
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if (_log.shouldLog(Log.DEBUG))
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_log.debug(direction + ": Socket closed - error reading and writing",
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ex);
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}
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}
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} catch (InterruptedIOException ex) {
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if (_log.shouldLog(Log.WARN))
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_log.warn(direction + ": Closing connection due to timeout (error: \""
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+ ex.getMessage() + "\")");
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} catch (IOException ex) {
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if (!finished) {
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if (_log.shouldLog(Log.WARN))
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_log.warn(direction + ": Error forwarding", ex);
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}
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//else
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// _log.warn("You may ignore this", ex);
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} finally {
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_cache.release(ba);
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if (_log.shouldLog(Log.INFO)) {
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_log.info(direction + ": done forwarding between "
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+ from + " and " + to);
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}
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try {
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in.close();
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} catch (IOException ex) {
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if (_log.shouldLog(Log.WARN))
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_log.warn(direction + ": Error closing input stream", ex);
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}
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try {
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// Thread must close() before exiting for a PipedOutputStream,
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// or else input end gives up and we have data loss.
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// http://techtavern.wordpress.com/2008/07/16/whats-this-ioexception-write-end-dead/
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//out.flush();
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out.close();
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} catch (IOException ioe) {
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if (_log.shouldLog(Log.WARN))
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_log.warn(direction + ": Error flushing to close", ioe);
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}
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synchronized (finishLock) {
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finished = true;
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finishLock.notifyAll();
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// the main thread will close sockets etc. now
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}
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}
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}
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}
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}
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