--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/trilead/ssh2/channel/ChannelManager.java	Thu May 22 10:41:19 2014 -0700
@@ -0,0 +1,1535 @@
+
+package com.trilead.ssh2.channel;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Vector;
+
+import com.trilead.ssh2.AuthAgentCallback;
+import com.trilead.ssh2.ChannelCondition;
+import com.trilead.ssh2.log.Logger;
+import com.trilead.ssh2.packets.PacketChannelAuthAgentReq;
+import com.trilead.ssh2.packets.PacketChannelOpenConfirmation;
+import com.trilead.ssh2.packets.PacketChannelOpenFailure;
+import com.trilead.ssh2.packets.PacketChannelTrileadPing;
+import com.trilead.ssh2.packets.PacketGlobalCancelForwardRequest;
+import com.trilead.ssh2.packets.PacketGlobalForwardRequest;
+import com.trilead.ssh2.packets.PacketGlobalTrileadPing;
+import com.trilead.ssh2.packets.PacketOpenDirectTCPIPChannel;
+import com.trilead.ssh2.packets.PacketOpenSessionChannel;
+import com.trilead.ssh2.packets.PacketSessionExecCommand;
+import com.trilead.ssh2.packets.PacketSessionPtyRequest;
+import com.trilead.ssh2.packets.PacketSessionPtyResize;
+import com.trilead.ssh2.packets.PacketSessionStartShell;
+import com.trilead.ssh2.packets.PacketSessionSubsystemRequest;
+import com.trilead.ssh2.packets.PacketSessionX11Request;
+import com.trilead.ssh2.packets.Packets;
+import com.trilead.ssh2.packets.TypesReader;
+import com.trilead.ssh2.transport.MessageHandler;
+import com.trilead.ssh2.transport.TransportManager;
+
+/**
+ * ChannelManager. Please read the comments in Channel.java.
+ * <p>
+ * Besides the crypto part, this is the core of the library.
+ *
+ * @author Christian Plattner, plattner@trilead.com
+ * @version $Id: ChannelManager.java,v 1.2 2008/03/03 07:01:36 cplattne Exp $
+ */
+public class ChannelManager implements MessageHandler {
+    private static final Logger log = Logger.getLogger(ChannelManager.class);
+
+    private HashMap<String, X11ServerData> x11_magic_cookies = new HashMap<String, X11ServerData>();
+
+    private TransportManager tm;
+
+    private Vector<Channel> channels = new Vector<Channel>();
+    private int nextLocalChannel = 100;
+    private boolean shutdown = false;
+    private int globalSuccessCounter = 0;
+    private int globalFailedCounter = 0;
+
+    private HashMap<Integer, RemoteForwardingData> remoteForwardings = new HashMap<Integer, RemoteForwardingData>();
+
+    private AuthAgentCallback authAgent;
+
+    private Vector<IChannelWorkerThread> listenerThreads = new Vector<IChannelWorkerThread>();
+
+    private boolean listenerThreadsAllowed = true;
+
+    public ChannelManager(TransportManager tm) {
+        this.tm = tm;
+        tm.registerMessageHandler(this, 80, 100);
+    }
+
+    private Channel getChannel(int id) {
+        synchronized (channels) {
+            for (int i = 0; i < channels.size(); i++) {
+                Channel c = channels.elementAt(i);
+
+                if (c.localID == id)
+                    return c;
+            }
+        }
+
+        return null;
+    }
+
+    private void removeChannel(int id) {
+        synchronized (channels) {
+            for (int i = 0; i < channels.size(); i++) {
+                Channel c = channels.elementAt(i);
+
+                if (c.localID == id) {
+                    channels.removeElementAt(i);
+                    break;
+                }
+            }
+        }
+    }
+
+    private int addChannel(Channel c) {
+        synchronized (channels) {
+            channels.addElement(c);
+            return nextLocalChannel++;
+        }
+    }
+
+    private void waitUntilChannelOpen(Channel c) throws IOException {
+        synchronized (c) {
+            while (c.state == Channel.STATE_OPENING) {
+                try {
+                    c.wait();
+                }
+                catch (InterruptedException ignore) {
+                }
+            }
+
+            if (c.state != Channel.STATE_OPEN) {
+                removeChannel(c.localID);
+                String detail = c.getReasonClosed();
+
+                if (detail == null)
+                    detail = "state: " + c.state;
+
+                throw new IOException("Could not open channel (" + detail + ")");
+            }
+        }
+    }
+
+    private final boolean waitForGlobalRequestResult() throws IOException {
+        synchronized (channels) {
+            while ((globalSuccessCounter == 0) && (globalFailedCounter == 0)) {
+                if (shutdown) {
+                    throw new IOException("The connection is being shutdown");
+                }
+
+                try {
+                    channels.wait();
+                }
+                catch (InterruptedException ignore) {
+                }
+            }
+
+            if ((globalFailedCounter == 0) && (globalSuccessCounter == 1))
+                return true;
+
+            if ((globalFailedCounter == 1) && (globalSuccessCounter == 0))
+                return false;
+
+            throw new IOException("Illegal state. The server sent " + globalSuccessCounter
+                                  + " SSH_MSG_REQUEST_SUCCESS and " + globalFailedCounter + " SSH_MSG_REQUEST_FAILURE messages.");
+        }
+    }
+
+    private final boolean waitForChannelRequestResult(Channel c) throws IOException {
+        synchronized (c) {
+            while ((c.successCounter == 0) && (c.failedCounter == 0)) {
+                if (c.state != Channel.STATE_OPEN) {
+                    String detail = c.getReasonClosed();
+
+                    if (detail == null)
+                        detail = "state: " + c.state;
+
+                    throw new IOException("This SSH2 channel is not open (" + detail + ")");
+                }
+
+                try {
+                    c.wait();
+                }
+                catch (InterruptedException ignore) {
+                }
+            }
+
+            if ((c.failedCounter == 0) && (c.successCounter == 1))
+                return true;
+
+            if ((c.failedCounter == 1) && (c.successCounter == 0))
+                return false;
+
+            throw new IOException("Illegal state. The server sent " + c.successCounter
+                                  + " SSH_MSG_CHANNEL_SUCCESS and " + c.failedCounter + " SSH_MSG_CHANNEL_FAILURE messages.");
+        }
+    }
+
+    public void registerX11Cookie(String hexFakeCookie, X11ServerData data) {
+        synchronized (x11_magic_cookies) {
+            x11_magic_cookies.put(hexFakeCookie, data);
+        }
+    }
+
+    public void unRegisterX11Cookie(String hexFakeCookie, boolean killChannels) {
+        if (hexFakeCookie == null)
+            throw new IllegalStateException("hexFakeCookie may not be null");
+
+        synchronized (x11_magic_cookies) {
+            x11_magic_cookies.remove(hexFakeCookie);
+        }
+
+        if (killChannels == false)
+            return;
+
+        if (log.isEnabled())
+            log.log(50, "Closing all X11 channels for the given fake cookie");
+
+        Vector<Channel> channel_copy;
+
+        synchronized (channels) {
+            channel_copy = (Vector<Channel>) channels.clone();
+        }
+
+        for (int i = 0; i < channel_copy.size(); i++) {
+            Channel c = channel_copy.elementAt(i);
+
+            synchronized (c) {
+                if (hexFakeCookie.equals(c.hexX11FakeCookie) == false)
+                    continue;
+            }
+
+            try {
+                closeChannel(c, "Closing X11 channel since the corresponding session is closing", true);
+            }
+            catch (IOException e) {
+            }
+        }
+    }
+
+    public X11ServerData checkX11Cookie(String hexFakeCookie) {
+        synchronized (x11_magic_cookies) {
+            if (hexFakeCookie != null)
+                return x11_magic_cookies.get(hexFakeCookie);
+        }
+
+        return null;
+    }
+
+    public void closeAllChannels() {
+        if (log.isEnabled())
+            log.log(50, "Closing all channels");
+
+        Vector<Channel> channel_copy;
+
+        synchronized (channels) {
+            channel_copy = (Vector<Channel>) channels.clone();
+        }
+
+        for (int i = 0; i < channel_copy.size(); i++) {
+            Channel c = channel_copy.elementAt(i);
+
+            try {
+                closeChannel(c, "Closing all channels", true);
+            }
+            catch (IOException e) {
+            }
+        }
+    }
+
+    public void closeChannel(Channel c, String reason, boolean force) throws IOException {
+        byte msg[] = new byte[5];
+
+        synchronized (c) {
+            if (force) {
+                c.state = Channel.STATE_CLOSED;
+                c.EOF = true;
+            }
+
+            c.setReasonClosed(reason);
+            msg[0] = Packets.SSH_MSG_CHANNEL_CLOSE;
+            msg[1] = (byte)(c.remoteID >> 24);
+            msg[2] = (byte)(c.remoteID >> 16);
+            msg[3] = (byte)(c.remoteID >> 8);
+            msg[4] = (byte)(c.remoteID);
+            c.notifyAll();
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent == true)
+                return;
+
+            tm.sendMessage(msg);
+            c.closeMessageSent = true;
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Sent SSH_MSG_CHANNEL_CLOSE (channel " + c.localID + ")");
+    }
+
+    public void sendEOF(Channel c) throws IOException {
+        byte[] msg = new byte[5];
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                return;
+
+            msg[0] = Packets.SSH_MSG_CHANNEL_EOF;
+            msg[1] = (byte)(c.remoteID >> 24);
+            msg[2] = (byte)(c.remoteID >> 16);
+            msg[3] = (byte)(c.remoteID >> 8);
+            msg[4] = (byte)(c.remoteID);
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent == true)
+                return;
+
+            tm.sendMessage(msg);
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Sent EOF (Channel " + c.localID + "/" + c.remoteID + ")");
+    }
+
+    public void sendOpenConfirmation(Channel c) throws IOException {
+        PacketChannelOpenConfirmation pcoc = null;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPENING)
+                return;
+
+            c.state = Channel.STATE_OPEN;
+            pcoc = new PacketChannelOpenConfirmation(c.remoteID, c.localID, c.localWindow, c.localMaxPacketSize);
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent == true)
+                return;
+
+            tm.sendMessage(pcoc.getPayload());
+        }
+    }
+
+    public void sendData(Channel c, byte[] buffer, int pos, int len) throws IOException {
+        while (len > 0) {
+            int thislen = 0;
+            byte[] msg;
+
+            synchronized (c) {
+                while (true) {
+                    if (c.state == Channel.STATE_CLOSED)
+                        throw new IOException("SSH channel is closed. (" + c.getReasonClosed() + ")");
+
+                    if (c.state != Channel.STATE_OPEN)
+                        throw new IOException("SSH channel in strange state. (" + c.state + ")");
+
+                    if (c.remoteWindow != 0)
+                        break;
+
+                    try {
+                        c.wait();
+                    }
+                    catch (InterruptedException ignore) {
+                    }
+                }
+
+                /* len > 0, no sign extension can happen when comparing */
+                thislen = (c.remoteWindow >= len) ? len : (int) c.remoteWindow;
+                int estimatedMaxDataLen = c.remoteMaxPacketSize - (tm.getPacketOverheadEstimate() + 9);
+
+                /* The worst case scenario =) a true bottleneck */
+
+                if (estimatedMaxDataLen <= 0) {
+                    estimatedMaxDataLen = 1;
+                }
+
+                if (thislen > estimatedMaxDataLen)
+                    thislen = estimatedMaxDataLen;
+
+                c.remoteWindow -= thislen;
+                msg = new byte[1 + 8 + thislen];
+                msg[0] = Packets.SSH_MSG_CHANNEL_DATA;
+                msg[1] = (byte)(c.remoteID >> 24);
+                msg[2] = (byte)(c.remoteID >> 16);
+                msg[3] = (byte)(c.remoteID >> 8);
+                msg[4] = (byte)(c.remoteID);
+                msg[5] = (byte)(thislen >> 24);
+                msg[6] = (byte)(thislen >> 16);
+                msg[7] = (byte)(thislen >> 8);
+                msg[8] = (byte)(thislen);
+                System.arraycopy(buffer, pos, msg, 9, thislen);
+            }
+
+            synchronized (c.channelSendLock) {
+                if (c.closeMessageSent == true)
+                    throw new IOException("SSH channel is closed. (" + c.getReasonClosed() + ")");
+
+                tm.sendMessage(msg);
+            }
+
+            pos += thislen;
+            len -= thislen;
+        }
+    }
+
+    public int requestGlobalForward(String bindAddress, int bindPort, String targetAddress, int targetPort)
+    throws IOException {
+        RemoteForwardingData rfd = new RemoteForwardingData();
+        rfd.bindAddress = bindAddress;
+        rfd.bindPort = bindPort;
+        rfd.targetAddress = targetAddress;
+        rfd.targetPort = targetPort;
+
+        synchronized (remoteForwardings) {
+            Integer key = Integer.valueOf(bindPort);
+
+            if (remoteForwardings.get(key) != null) {
+                throw new IOException("There is already a forwarding for remote port " + bindPort);
+            }
+
+            remoteForwardings.put(key, rfd);
+        }
+
+        synchronized (channels) {
+            globalSuccessCounter = globalFailedCounter = 0;
+        }
+
+        PacketGlobalForwardRequest pgf = new PacketGlobalForwardRequest(true, bindAddress, bindPort);
+        tm.sendMessage(pgf.getPayload());
+
+        if (log.isEnabled())
+            log.log(50, "Requesting a remote forwarding ('" + bindAddress + "', " + bindPort + ")");
+
+        try {
+            if (waitForGlobalRequestResult() == false)
+                throw new IOException("The server denied the request (did you enable port forwarding?)");
+        }
+        catch (IOException e) {
+            synchronized (remoteForwardings) {
+                remoteForwardings.remove(rfd);
+            }
+
+            throw e;
+        }
+
+        return bindPort;
+    }
+
+    public void requestCancelGlobalForward(int bindPort) throws IOException {
+        RemoteForwardingData rfd = null;
+
+        synchronized (remoteForwardings) {
+            rfd = remoteForwardings.get(Integer.valueOf(bindPort));
+
+            if (rfd == null)
+                throw new IOException("Sorry, there is no known remote forwarding for remote port " + bindPort);
+        }
+
+        synchronized (channels) {
+            globalSuccessCounter = globalFailedCounter = 0;
+        }
+
+        PacketGlobalCancelForwardRequest pgcf = new PacketGlobalCancelForwardRequest(true, rfd.bindAddress,
+                rfd.bindPort);
+        tm.sendMessage(pgcf.getPayload());
+
+        if (log.isEnabled())
+            log.log(50, "Requesting cancelation of remote forward ('" + rfd.bindAddress + "', " + rfd.bindPort + ")");
+
+        try {
+            if (waitForGlobalRequestResult() == false)
+                throw new IOException("The server denied the request.");
+        }
+        finally {
+            synchronized (remoteForwardings) {
+                /* Only now we are sure that no more forwarded connections will arrive */
+                remoteForwardings.remove(rfd);
+            }
+        }
+    }
+
+    /**
+     * @param agent
+     * @throws IOException
+     */
+    public boolean requestChannelAgentForwarding(Channel c, AuthAgentCallback authAgent) throws IOException {
+        synchronized (this) {
+            if (this.authAgent != null)
+                throw new IllegalStateException("Auth agent already exists");
+
+            this.authAgent = authAgent;
+        }
+
+        synchronized (channels) {
+            globalSuccessCounter = globalFailedCounter = 0;
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Requesting agent forwarding");
+
+        PacketChannelAuthAgentReq aar = new PacketChannelAuthAgentReq(c.remoteID);
+        tm.sendMessage(aar.getPayload());
+
+        if (waitForChannelRequestResult(c) == false) {
+            authAgent = null;
+            return false;
+        }
+
+        return true;
+    }
+
+    public void registerThread(IChannelWorkerThread thr) throws IOException {
+        synchronized (listenerThreads) {
+            if (listenerThreadsAllowed == false)
+                throw new IOException("Too late, this connection is closed.");
+
+            listenerThreads.addElement(thr);
+        }
+    }
+
+    public Channel openDirectTCPIPChannel(String host_to_connect, int port_to_connect, String originator_IP_address,
+                                          int originator_port) throws IOException {
+        Channel c = new Channel(this);
+
+        synchronized (c) {
+            c.localID = addChannel(c);
+            // end of synchronized block forces writing out to main memory
+        }
+
+        PacketOpenDirectTCPIPChannel dtc = new PacketOpenDirectTCPIPChannel(c.localID, c.localWindow,
+                c.localMaxPacketSize, host_to_connect, port_to_connect, originator_IP_address, originator_port);
+        tm.sendMessage(dtc.getPayload());
+        waitUntilChannelOpen(c);
+        return c;
+    }
+
+    public Channel openSessionChannel() throws IOException {
+        Channel c = new Channel(this);
+
+        synchronized (c) {
+            c.localID = addChannel(c);
+            // end of synchronized block forces the writing out to main memory
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Sending SSH_MSG_CHANNEL_OPEN (Channel " + c.localID + ")");
+
+        PacketOpenSessionChannel smo = new PacketOpenSessionChannel(c.localID, c.localWindow, c.localMaxPacketSize);
+        tm.sendMessage(smo.getPayload());
+        waitUntilChannelOpen(c);
+        return c;
+    }
+
+    public void requestGlobalTrileadPing() throws IOException {
+        synchronized (channels) {
+            globalSuccessCounter = globalFailedCounter = 0;
+        }
+
+        PacketGlobalTrileadPing pgtp = new PacketGlobalTrileadPing();
+        tm.sendMessage(pgtp.getPayload());
+
+        if (log.isEnabled())
+            log.log(50, "Sending SSH_MSG_GLOBAL_REQUEST 'trilead-ping'.");
+
+        try {
+            if (waitForGlobalRequestResult() == true)
+                throw new IOException("Your server is alive - but buggy. "
+                                      + "It replied with SSH_MSG_REQUEST_SUCCESS when it actually should not.");
+        }
+        catch (IOException e) {
+            throw(IOException) new IOException("The ping request failed.").initCause(e);
+        }
+    }
+
+    public void requestChannelTrileadPing(Channel c) throws IOException {
+        PacketChannelTrileadPing pctp;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Cannot ping this channel (" + c.getReasonClosed() + ")");
+
+            pctp = new PacketChannelTrileadPing(c.remoteID);
+            c.successCounter = c.failedCounter = 0;
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent)
+                throw new IOException("Cannot ping this channel (" + c.getReasonClosed() + ")");
+
+            tm.sendMessage(pctp.getPayload());
+        }
+
+        try {
+            if (waitForChannelRequestResult(c) == true)
+                throw new IOException("Your server is alive - but buggy. "
+                                      + "It replied with SSH_MSG_SESSION_SUCCESS when it actually should not.");
+        }
+        catch (IOException e) {
+            throw(IOException) new IOException("The ping request failed.").initCause(e);
+        }
+    }
+
+    public void requestPTY(Channel c, String term, int term_width_characters, int term_height_characters,
+                           int term_width_pixels, int term_height_pixels, byte[] terminal_modes) throws IOException {
+        PacketSessionPtyRequest spr;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Cannot request PTY on this channel (" + c.getReasonClosed() + ")");
+
+            spr = new PacketSessionPtyRequest(c.remoteID, true, term, term_width_characters, term_height_characters,
+                                              term_width_pixels, term_height_pixels, terminal_modes);
+            c.successCounter = c.failedCounter = 0;
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent)
+                throw new IOException("Cannot request PTY on this channel (" + c.getReasonClosed() + ")");
+
+            tm.sendMessage(spr.getPayload());
+        }
+
+        try {
+            if (waitForChannelRequestResult(c) == false)
+                throw new IOException("The server denied the request.");
+        }
+        catch (IOException e) {
+            throw(IOException) new IOException("PTY request failed").initCause(e);
+        }
+    }
+
+
+    public void resizePTY(Channel c, int term_width_characters, int term_height_characters,
+                          int term_width_pixels, int term_height_pixels) throws IOException {
+        PacketSessionPtyResize spr;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Cannot request PTY on this channel ("
+                                      + c.getReasonClosed() + ")");
+
+            spr = new PacketSessionPtyResize(c.remoteID, term_width_characters, term_height_characters,
+                                             term_width_pixels, term_height_pixels);
+            c.successCounter = c.failedCounter = 0;
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent)
+                throw new IOException("Cannot request PTY on this channel ("
+                                      + c.getReasonClosed() + ")");
+
+            tm.sendMessage(spr.getPayload());
+        }
+    }
+
+
+    public void requestX11(Channel c, boolean singleConnection, String x11AuthenticationProtocol,
+                           String x11AuthenticationCookie, int x11ScreenNumber) throws IOException {
+        PacketSessionX11Request psr;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Cannot request X11 on this channel (" + c.getReasonClosed() + ")");
+
+            psr = new PacketSessionX11Request(c.remoteID, true, singleConnection, x11AuthenticationProtocol,
+                                              x11AuthenticationCookie, x11ScreenNumber);
+            c.successCounter = c.failedCounter = 0;
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent)
+                throw new IOException("Cannot request X11 on this channel (" + c.getReasonClosed() + ")");
+
+            tm.sendMessage(psr.getPayload());
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Requesting X11 forwarding (Channel " + c.localID + "/" + c.remoteID + ")");
+
+        try {
+            if (waitForChannelRequestResult(c) == false)
+                throw new IOException("The server denied the request.");
+        }
+        catch (IOException e) {
+            throw(IOException) new IOException("The X11 request failed.").initCause(e);
+        }
+    }
+
+    public void requestSubSystem(Channel c, String subSystemName) throws IOException {
+        PacketSessionSubsystemRequest ssr;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Cannot request subsystem on this channel (" + c.getReasonClosed() + ")");
+
+            ssr = new PacketSessionSubsystemRequest(c.remoteID, true, subSystemName);
+            c.successCounter = c.failedCounter = 0;
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent)
+                throw new IOException("Cannot request subsystem on this channel (" + c.getReasonClosed() + ")");
+
+            tm.sendMessage(ssr.getPayload());
+        }
+
+        try {
+            if (waitForChannelRequestResult(c) == false)
+                throw new IOException("The server denied the request.");
+        }
+        catch (IOException e) {
+            throw(IOException) new IOException("The subsystem request failed.").initCause(e);
+        }
+    }
+
+    public void requestExecCommand(Channel c, String cmd) throws IOException {
+        PacketSessionExecCommand sm;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Cannot execute command on this channel (" + c.getReasonClosed() + ")");
+
+            sm = new PacketSessionExecCommand(c.remoteID, true, cmd);
+            c.successCounter = c.failedCounter = 0;
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent)
+                throw new IOException("Cannot execute command on this channel (" + c.getReasonClosed() + ")");
+
+            tm.sendMessage(sm.getPayload());
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Executing command (channel " + c.localID + ", '" + cmd + "')");
+
+        try {
+            if (waitForChannelRequestResult(c) == false)
+                throw new IOException("The server denied the request.");
+        }
+        catch (IOException e) {
+            throw(IOException) new IOException("The execute request failed.").initCause(e);
+        }
+    }
+
+    public void requestShell(Channel c) throws IOException {
+        PacketSessionStartShell sm;
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Cannot start shell on this channel (" + c.getReasonClosed() + ")");
+
+            sm = new PacketSessionStartShell(c.remoteID, true);
+            c.successCounter = c.failedCounter = 0;
+        }
+
+        synchronized (c.channelSendLock) {
+            if (c.closeMessageSent)
+                throw new IOException("Cannot start shell on this channel (" + c.getReasonClosed() + ")");
+
+            tm.sendMessage(sm.getPayload());
+        }
+
+        try {
+            if (waitForChannelRequestResult(c) == false)
+                throw new IOException("The server denied the request.");
+        }
+        catch (IOException e) {
+            throw(IOException) new IOException("The shell request failed.").initCause(e);
+        }
+    }
+
+    public void msgChannelExtendedData(byte[] msg, int msglen) throws IOException {
+        if (msglen <= 13)
+            throw new IOException("SSH_MSG_CHANNEL_EXTENDED_DATA message has wrong size (" + msglen + ")");
+
+        int id = ((msg[1] & 0xff) << 24) | ((msg[2] & 0xff) << 16) | ((msg[3] & 0xff) << 8) | (msg[4] & 0xff);
+        int dataType = ((msg[5] & 0xff) << 24) | ((msg[6] & 0xff) << 16) | ((msg[7] & 0xff) << 8) | (msg[8] & 0xff);
+        int len = ((msg[9] & 0xff) << 24) | ((msg[10] & 0xff) << 16) | ((msg[11] & 0xff) << 8) | (msg[12] & 0xff);
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_EXTENDED_DATA message for non-existent channel " + id);
+
+        if (dataType != Packets.SSH_EXTENDED_DATA_STDERR)
+            throw new IOException("SSH_MSG_CHANNEL_EXTENDED_DATA message has unknown type (" + dataType + ")");
+
+        if (len != (msglen - 13))
+            throw new IOException("SSH_MSG_CHANNEL_EXTENDED_DATA message has wrong len (calculated " + (msglen - 13)
+                                  + ", got " + len + ")");
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_CHANNEL_EXTENDED_DATA (channel " + id + ", " + len + ")");
+
+        synchronized (c) {
+            if (c.state == Channel.STATE_CLOSED)
+                return; // ignore
+
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Got SSH_MSG_CHANNEL_EXTENDED_DATA, but channel is not in correct state ("
+                                      + c.state + ")");
+
+            if (c.localWindow < len)
+                throw new IOException("Remote sent too much data, does not fit into window.");
+
+            c.localWindow -= len;
+            System.arraycopy(msg, 13, c.stderrBuffer, c.stderrWritepos, len);
+            c.stderrWritepos += len;
+            c.notifyAll();
+        }
+    }
+
+    /**
+     * Wait until for a condition.
+     *
+     * @param c
+     *            Channel
+     * @param timeout
+     *            in ms, 0 means no timeout.
+     * @param condition_mask
+     *            minimum event mask
+     * @return all current events
+     *
+     */
+    public int waitForCondition(Channel c, long timeout, int condition_mask) {
+        long end_time = 0;
+        boolean end_time_set = false;
+
+        synchronized (c) {
+            while (true) {
+                int current_cond = 0;
+                int stdoutAvail = c.stdoutWritepos - c.stdoutReadpos;
+                int stderrAvail = c.stderrWritepos - c.stderrReadpos;
+
+                if (stdoutAvail > 0)
+                    current_cond = current_cond | ChannelCondition.STDOUT_DATA;
+
+                if (stderrAvail > 0)
+                    current_cond = current_cond | ChannelCondition.STDERR_DATA;
+
+                if (c.EOF)
+                    current_cond = current_cond | ChannelCondition.EOF;
+
+                if (c.getExitStatus() != null)
+                    current_cond = current_cond | ChannelCondition.EXIT_STATUS;
+
+                if (c.getExitSignal() != null)
+                    current_cond = current_cond | ChannelCondition.EXIT_SIGNAL;
+
+                if (c.state == Channel.STATE_CLOSED)
+                    return current_cond | ChannelCondition.CLOSED | ChannelCondition.EOF;
+
+                if ((current_cond & condition_mask) != 0)
+                    return current_cond;
+
+                if (timeout > 0) {
+                    if (!end_time_set) {
+                        end_time = System.currentTimeMillis() + timeout;
+                        end_time_set = true;
+                    }
+                    else {
+                        timeout = end_time - System.currentTimeMillis();
+
+                        if (timeout <= 0)
+                            return current_cond | ChannelCondition.TIMEOUT;
+                    }
+                }
+
+                try {
+                    if (timeout > 0)
+                        c.wait(timeout);
+                    else
+                        c.wait();
+                }
+                catch (InterruptedException e) {
+                }
+            }
+        }
+    }
+
+    public int getAvailable(Channel c, boolean extended) throws IOException {
+        synchronized (c) {
+            int avail;
+
+            if (extended)
+                avail = c.stderrWritepos - c.stderrReadpos;
+            else
+                avail = c.stdoutWritepos - c.stdoutReadpos;
+
+            return ((avail > 0) ? avail : (c.EOF ? -1 : 0));
+        }
+    }
+
+    public int getChannelData(Channel c, boolean extended, byte[] target, int off, int len) throws IOException {
+        int copylen = 0;
+        int increment = 0;
+        int remoteID = 0;
+        int localID = 0;
+
+        synchronized (c) {
+            int stdoutAvail = 0;
+            int stderrAvail = 0;
+
+            while (true) {
+                /*
+                 * Data available? We have to return remaining data even if the
+                 * channel is already closed.
+                 */
+                stdoutAvail = c.stdoutWritepos - c.stdoutReadpos;
+                stderrAvail = c.stderrWritepos - c.stderrReadpos;
+
+                if ((!extended) && (stdoutAvail != 0))
+                    break;
+
+                if ((extended) && (stderrAvail != 0))
+                    break;
+
+                /* Do not wait if more data will never arrive (EOF or CLOSED) */
+
+                if ((c.EOF) || (c.state != Channel.STATE_OPEN))
+                    return -1;
+
+                try {
+                    c.wait();
+                }
+                catch (InterruptedException ignore) {
+                }
+            }
+
+            /* OK, there is some data. Return it. */
+
+            if (!extended) {
+                copylen = (stdoutAvail > len) ? len : stdoutAvail;
+                System.arraycopy(c.stdoutBuffer, c.stdoutReadpos, target, off, copylen);
+                c.stdoutReadpos += copylen;
+
+                if (c.stdoutReadpos != c.stdoutWritepos)
+                    System.arraycopy(c.stdoutBuffer, c.stdoutReadpos, c.stdoutBuffer, 0, c.stdoutWritepos
+                                     - c.stdoutReadpos);
+
+                c.stdoutWritepos -= c.stdoutReadpos;
+                c.stdoutReadpos = 0;
+            }
+            else {
+                copylen = (stderrAvail > len) ? len : stderrAvail;
+                System.arraycopy(c.stderrBuffer, c.stderrReadpos, target, off, copylen);
+                c.stderrReadpos += copylen;
+
+                if (c.stderrReadpos != c.stderrWritepos)
+                    System.arraycopy(c.stderrBuffer, c.stderrReadpos, c.stderrBuffer, 0, c.stderrWritepos
+                                     - c.stderrReadpos);
+
+                c.stderrWritepos -= c.stderrReadpos;
+                c.stderrReadpos = 0;
+            }
+
+            if (c.state != Channel.STATE_OPEN)
+                return copylen;
+
+            if (c.localWindow < ((Channel.CHANNEL_BUFFER_SIZE + 1) / 2)) {
+                int minFreeSpace = Math.min(Channel.CHANNEL_BUFFER_SIZE - c.stdoutWritepos, Channel.CHANNEL_BUFFER_SIZE
+                                            - c.stderrWritepos);
+                increment = minFreeSpace - c.localWindow;
+                c.localWindow = minFreeSpace;
+            }
+
+            remoteID = c.remoteID; /* read while holding the lock */
+            localID = c.localID; /* read while holding the lock */
+        }
+
+        /*
+         * If a consumer reads stdout and stdin in parallel, we may end up with
+         * sending two msgWindowAdjust messages. Luckily, it
+         * does not matter in which order they arrive at the server.
+         */
+
+        if (increment > 0) {
+            if (log.isEnabled())
+                log.log(80, "Sending SSH_MSG_CHANNEL_WINDOW_ADJUST (channel " + localID + ", " + increment + ")");
+
+            synchronized (c.channelSendLock) {
+                byte[] msg = c.msgWindowAdjust;
+                msg[0] = Packets.SSH_MSG_CHANNEL_WINDOW_ADJUST;
+                msg[1] = (byte)(remoteID >> 24);
+                msg[2] = (byte)(remoteID >> 16);
+                msg[3] = (byte)(remoteID >> 8);
+                msg[4] = (byte)(remoteID);
+                msg[5] = (byte)(increment >> 24);
+                msg[6] = (byte)(increment >> 16);
+                msg[7] = (byte)(increment >> 8);
+                msg[8] = (byte)(increment);
+
+                if (c.closeMessageSent == false)
+                    tm.sendMessage(msg);
+            }
+        }
+
+        return copylen;
+    }
+
+    public void msgChannelData(byte[] msg, int msglen) throws IOException {
+        if (msglen <= 9)
+            throw new IOException("SSH_MSG_CHANNEL_DATA message has wrong size (" + msglen + ")");
+
+        int id = ((msg[1] & 0xff) << 24) | ((msg[2] & 0xff) << 16) | ((msg[3] & 0xff) << 8) | (msg[4] & 0xff);
+        int len = ((msg[5] & 0xff) << 24) | ((msg[6] & 0xff) << 16) | ((msg[7] & 0xff) << 8) | (msg[8] & 0xff);
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_DATA message for non-existent channel " + id);
+
+        if (len != (msglen - 9))
+            throw new IOException("SSH_MSG_CHANNEL_DATA message has wrong len (calculated " + (msglen - 9) + ", got "
+                                  + len + ")");
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_CHANNEL_DATA (channel " + id + ", " + len + ")");
+
+        synchronized (c) {
+            if (c.state == Channel.STATE_CLOSED)
+                return; // ignore
+
+            if (c.state != Channel.STATE_OPEN)
+                throw new IOException("Got SSH_MSG_CHANNEL_DATA, but channel is not in correct state (" + c.state + ")");
+
+            if (c.localWindow < len)
+                throw new IOException("Remote sent too much data, does not fit into window.");
+
+            c.localWindow -= len;
+            System.arraycopy(msg, 9, c.stdoutBuffer, c.stdoutWritepos, len);
+            c.stdoutWritepos += len;
+            c.notifyAll();
+        }
+    }
+
+    public void msgChannelWindowAdjust(byte[] msg, int msglen) throws IOException {
+        if (msglen != 9)
+            throw new IOException("SSH_MSG_CHANNEL_WINDOW_ADJUST message has wrong size (" + msglen + ")");
+
+        int id = ((msg[1] & 0xff) << 24) | ((msg[2] & 0xff) << 16) | ((msg[3] & 0xff) << 8) | (msg[4] & 0xff);
+        int windowChange = ((msg[5] & 0xff) << 24) | ((msg[6] & 0xff) << 16) | ((msg[7] & 0xff) << 8) | (msg[8] & 0xff);
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_WINDOW_ADJUST message for non-existent channel " + id);
+
+        synchronized (c) {
+            final long huge = 0xFFFFffffL; /* 2^32 - 1 */
+            c.remoteWindow += (windowChange & huge); /* avoid sign extension */
+
+            /* TODO - is this a good heuristic? */
+
+            if ((c.remoteWindow > huge))
+                c.remoteWindow = huge;
+
+            c.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_CHANNEL_WINDOW_ADJUST (channel " + id + ", " + windowChange + ")");
+    }
+
+    public void msgChannelOpen(byte[] msg, int msglen) throws IOException {
+        TypesReader tr = new TypesReader(msg, 0, msglen);
+        tr.readByte(); // skip packet type
+        String channelType = tr.readString();
+        int remoteID = tr.readUINT32(); /* sender channel */
+        int remoteWindow = tr.readUINT32(); /* initial window size */
+        int remoteMaxPacketSize = tr.readUINT32(); /* maximum packet size */
+
+        if ("x11".equals(channelType)) {
+            synchronized (x11_magic_cookies) {
+                /* If we did not request X11 forwarding, then simply ignore this bogus request. */
+                if (x11_magic_cookies.size() == 0) {
+                    PacketChannelOpenFailure pcof = new PacketChannelOpenFailure(remoteID,
+                            Packets.SSH_OPEN_ADMINISTRATIVELY_PROHIBITED, "X11 forwarding not activated", "");
+                    tm.sendAsynchronousMessage(pcof.getPayload());
+
+                    if (log.isEnabled())
+                        log.log(20, "Unexpected X11 request, denying it!");
+
+                    return;
+                }
+            }
+
+            String remoteOriginatorAddress = tr.readString();
+            int remoteOriginatorPort = tr.readUINT32();
+            Channel c = new Channel(this);
+
+            synchronized (c) {
+                c.remoteID = remoteID;
+                c.remoteWindow = remoteWindow & 0xFFFFffffL; /* properly convert UINT32 to long */
+                c.remoteMaxPacketSize = remoteMaxPacketSize;
+                c.localID = addChannel(c);
+            }
+
+            /*
+             * The open confirmation message will be sent from another thread
+             */
+            RemoteX11AcceptThread rxat = new RemoteX11AcceptThread(c, remoteOriginatorAddress, remoteOriginatorPort);
+            rxat.setDaemon(true);
+            rxat.start();
+            return;
+        }
+
+        if ("forwarded-tcpip".equals(channelType)) {
+            String remoteConnectedAddress = tr.readString(); /* address that was connected */
+            int remoteConnectedPort = tr.readUINT32(); /* port that was connected */
+            String remoteOriginatorAddress = tr.readString(); /* originator IP address */
+            int remoteOriginatorPort = tr.readUINT32(); /* originator port */
+            RemoteForwardingData rfd = null;
+
+            synchronized (remoteForwardings) {
+                rfd = remoteForwardings.get(Integer.valueOf(remoteConnectedPort));
+            }
+
+            if (rfd == null) {
+                PacketChannelOpenFailure pcof = new PacketChannelOpenFailure(remoteID,
+                        Packets.SSH_OPEN_ADMINISTRATIVELY_PROHIBITED,
+                        "No thanks, unknown port in forwarded-tcpip request", "");
+                /* Always try to be polite. */
+                tm.sendAsynchronousMessage(pcof.getPayload());
+
+                if (log.isEnabled())
+                    log.log(20, "Unexpected forwarded-tcpip request, denying it!");
+
+                return;
+            }
+
+            Channel c = new Channel(this);
+
+            synchronized (c) {
+                c.remoteID = remoteID;
+                c.remoteWindow = remoteWindow & 0xFFFFffffL; /* convert UINT32 to long */
+                c.remoteMaxPacketSize = remoteMaxPacketSize;
+                c.localID = addChannel(c);
+            }
+
+            /*
+             * The open confirmation message will be sent from another thread.
+             */
+            RemoteAcceptThread rat = new RemoteAcceptThread(c, remoteConnectedAddress, remoteConnectedPort,
+                    remoteOriginatorAddress, remoteOriginatorPort, rfd.targetAddress, rfd.targetPort);
+            rat.setDaemon(true);
+            rat.start();
+            return;
+        }
+
+        if ("auth-agent@openssh.com".equals(channelType)) {
+            Channel c = new Channel(this);
+
+            synchronized (c) {
+                c.remoteID = remoteID;
+                c.remoteWindow = remoteWindow & 0xFFFFffffL; /* properly convert UINT32 to long */
+                c.remoteMaxPacketSize = remoteMaxPacketSize;
+                c.localID = addChannel(c);
+            }
+
+            AuthAgentForwardThread aat = new AuthAgentForwardThread(c, authAgent);
+            aat.setDaemon(true);
+            aat.start();
+            return;
+        }
+
+        /* Tell the server that we have no idea what it is talking about */
+        PacketChannelOpenFailure pcof = new PacketChannelOpenFailure(remoteID, Packets.SSH_OPEN_UNKNOWN_CHANNEL_TYPE,
+                "Unknown channel type", "");
+        tm.sendAsynchronousMessage(pcof.getPayload());
+
+        if (log.isEnabled())
+            log.log(20, "The peer tried to open an unsupported channel type (" + channelType + ")");
+    }
+
+    public void msgChannelRequest(byte[] msg, int msglen) throws IOException {
+        TypesReader tr = new TypesReader(msg, 0, msglen);
+        tr.readByte(); // skip packet type
+        int id = tr.readUINT32();
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_REQUEST message for non-existent channel " + id);
+
+        String type = tr.readString("US-ASCII");
+        boolean wantReply = tr.readBoolean();
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_CHANNEL_REQUEST (channel " + id + ", '" + type + "')");
+
+        if (type.equals("exit-status")) {
+            if (wantReply != false)
+                throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message, 'want reply' is true");
+
+            int exit_status = tr.readUINT32();
+
+            if (tr.remain() != 0)
+                throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message");
+
+            synchronized (c) {
+                c.exit_status = Integer.valueOf(exit_status);
+                c.notifyAll();
+            }
+
+            if (log.isEnabled())
+                log.log(50, "Got EXIT STATUS (channel " + id + ", status " + exit_status + ")");
+
+            return;
+        }
+
+        if (type.equals("exit-signal")) {
+            if (wantReply != false)
+                throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message, 'want reply' is true");
+
+            String signame = tr.readString("US-ASCII");
+            tr.readBoolean();
+            tr.readString();
+            tr.readString();
+
+            if (tr.remain() != 0)
+                throw new IOException("Badly formatted SSH_MSG_CHANNEL_REQUEST message");
+
+            synchronized (c) {
+                c.exit_signal = signame;
+                c.notifyAll();
+            }
+
+            if (log.isEnabled())
+                log.log(50, "Got EXIT SIGNAL (channel " + id + ", signal " + signame + ")");
+
+            return;
+        }
+
+        /* We simply ignore unknown channel requests, however, if the server wants a reply,
+         * then we signal that we have no idea what it is about.
+         */
+
+        if (wantReply) {
+            byte[] reply = new byte[5];
+            reply[0] = Packets.SSH_MSG_CHANNEL_FAILURE;
+            reply[1] = (byte)(c.remoteID >> 24);
+            reply[2] = (byte)(c.remoteID >> 16);
+            reply[3] = (byte)(c.remoteID >> 8);
+            reply[4] = (byte)(c.remoteID);
+            tm.sendAsynchronousMessage(reply);
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Channel request '" + type + "' is not known, ignoring it");
+    }
+
+    public void msgChannelEOF(byte[] msg, int msglen) throws IOException {
+        if (msglen != 5)
+            throw new IOException("SSH_MSG_CHANNEL_EOF message has wrong size (" + msglen + ")");
+
+        int id = ((msg[1] & 0xff) << 24) | ((msg[2] & 0xff) << 16) | ((msg[3] & 0xff) << 8) | (msg[4] & 0xff);
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_EOF message for non-existent channel " + id);
+
+        synchronized (c) {
+            c.EOF = true;
+            c.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Got SSH_MSG_CHANNEL_EOF (channel " + id + ")");
+    }
+
+    public void msgChannelClose(byte[] msg, int msglen) throws IOException {
+        if (msglen != 5)
+            throw new IOException("SSH_MSG_CHANNEL_CLOSE message has wrong size (" + msglen + ")");
+
+        int id = ((msg[1] & 0xff) << 24) | ((msg[2] & 0xff) << 16) | ((msg[3] & 0xff) << 8) | (msg[4] & 0xff);
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_CLOSE message for non-existent channel " + id);
+
+        synchronized (c) {
+            c.EOF = true;
+            c.state = Channel.STATE_CLOSED;
+            c.setReasonClosed("Close requested by remote");
+            c.closeMessageRecv = true;
+            removeChannel(c.localID);
+            c.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Got SSH_MSG_CHANNEL_CLOSE (channel " + id + ")");
+    }
+
+    public void msgChannelSuccess(byte[] msg, int msglen) throws IOException {
+        if (msglen != 5)
+            throw new IOException("SSH_MSG_CHANNEL_SUCCESS message has wrong size (" + msglen + ")");
+
+        int id = ((msg[1] & 0xff) << 24) | ((msg[2] & 0xff) << 16) | ((msg[3] & 0xff) << 8) | (msg[4] & 0xff);
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_SUCCESS message for non-existent channel " + id);
+
+        synchronized (c) {
+            c.successCounter++;
+            c.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_CHANNEL_SUCCESS (channel " + id + ")");
+    }
+
+    public void msgChannelFailure(byte[] msg, int msglen) throws IOException {
+        if (msglen != 5)
+            throw new IOException("SSH_MSG_CHANNEL_FAILURE message has wrong size (" + msglen + ")");
+
+        int id = ((msg[1] & 0xff) << 24) | ((msg[2] & 0xff) << 16) | ((msg[3] & 0xff) << 8) | (msg[4] & 0xff);
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_FAILURE message for non-existent channel " + id);
+
+        synchronized (c) {
+            c.failedCounter++;
+            c.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Got SSH_MSG_CHANNEL_FAILURE (channel " + id + ")");
+    }
+
+    public void msgChannelOpenConfirmation(byte[] msg, int msglen) throws IOException {
+        PacketChannelOpenConfirmation sm = new PacketChannelOpenConfirmation(msg, 0, msglen);
+        Channel c = getChannel(sm.recipientChannelID);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_OPEN_CONFIRMATION message for non-existent channel "
+                                  + sm.recipientChannelID);
+
+        synchronized (c) {
+            if (c.state != Channel.STATE_OPENING)
+                throw new IOException("Unexpected SSH_MSG_CHANNEL_OPEN_CONFIRMATION message for channel "
+                                      + sm.recipientChannelID);
+
+            c.remoteID = sm.senderChannelID;
+            c.remoteWindow = sm.initialWindowSize & 0xFFFFffffL; /* convert UINT32 to long */
+            c.remoteMaxPacketSize = sm.maxPacketSize;
+            c.state = Channel.STATE_OPEN;
+            c.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Got SSH_MSG_CHANNEL_OPEN_CONFIRMATION (channel " + sm.recipientChannelID + " / remote: "
+                    + sm.senderChannelID + ")");
+    }
+
+    public void msgChannelOpenFailure(byte[] msg, int msglen) throws IOException {
+        if (msglen < 5)
+            throw new IOException("SSH_MSG_CHANNEL_OPEN_FAILURE message has wrong size (" + msglen + ")");
+
+        TypesReader tr = new TypesReader(msg, 0, msglen);
+        tr.readByte(); // skip packet type
+        int id = tr.readUINT32(); /* sender channel */
+        Channel c = getChannel(id);
+
+        if (c == null)
+            throw new IOException("Unexpected SSH_MSG_CHANNEL_OPEN_FAILURE message for non-existent channel " + id);
+
+        int reasonCode = tr.readUINT32();
+        String description = tr.readString("UTF-8");
+        String reasonCodeSymbolicName = null;
+
+        switch (reasonCode) {
+            case 1:
+                reasonCodeSymbolicName = "SSH_OPEN_ADMINISTRATIVELY_PROHIBITED";
+                break;
+
+            case 2:
+                reasonCodeSymbolicName = "SSH_OPEN_CONNECT_FAILED";
+                break;
+
+            case 3:
+                reasonCodeSymbolicName = "SSH_OPEN_UNKNOWN_CHANNEL_TYPE";
+                break;
+
+            case 4:
+                reasonCodeSymbolicName = "SSH_OPEN_RESOURCE_SHORTAGE";
+                break;
+
+            default:
+                reasonCodeSymbolicName = "UNKNOWN REASON CODE (" + reasonCode + ")";
+        }
+
+        StringBuffer descriptionBuffer = new StringBuffer();
+        descriptionBuffer.append(description);
+
+        for (int i = 0; i < descriptionBuffer.length(); i++) {
+            char cc = descriptionBuffer.charAt(i);
+
+            if ((cc >= 32) && (cc <= 126))
+                continue;
+
+            descriptionBuffer.setCharAt(i, '\uFFFD');
+        }
+
+        synchronized (c) {
+            c.EOF = true;
+            c.state = Channel.STATE_CLOSED;
+            c.setReasonClosed("The server refused to open the channel (" + reasonCodeSymbolicName + ", '"
+                              + descriptionBuffer.toString() + "')");
+            c.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(50, "Got SSH_MSG_CHANNEL_OPEN_FAILURE (channel " + id + ")");
+    }
+
+    public void msgGlobalRequest(byte[] msg, int msglen) throws IOException {
+        /* Currently we do not support any kind of global request */
+        TypesReader tr = new TypesReader(msg, 0, msglen);
+        tr.readByte(); // skip packet type
+        String requestName = tr.readString();
+        boolean wantReply = tr.readBoolean();
+
+        if (wantReply) {
+            byte[] reply_failure = new byte[1];
+            reply_failure[0] = Packets.SSH_MSG_REQUEST_FAILURE;
+            tm.sendAsynchronousMessage(reply_failure);
+        }
+
+        /* We do not clean up the requestName String - that is OK for debug */
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_GLOBAL_REQUEST (" + requestName + ")");
+    }
+
+    public void msgGlobalSuccess() throws IOException {
+        synchronized (channels) {
+            globalSuccessCounter++;
+            channels.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_REQUEST_SUCCESS");
+    }
+
+    public void msgGlobalFailure() throws IOException {
+        synchronized (channels) {
+            globalFailedCounter++;
+            channels.notifyAll();
+        }
+
+        if (log.isEnabled())
+            log.log(80, "Got SSH_MSG_REQUEST_FAILURE");
+    }
+
+    public void handleMessage(byte[] msg, int msglen) throws IOException {
+        if (msg == null) {
+            if (log.isEnabled())
+                log.log(50, "HandleMessage: got shutdown");
+
+            synchronized (listenerThreads) {
+                for (int i = 0; i < listenerThreads.size(); i++) {
+                    IChannelWorkerThread lat = listenerThreads.elementAt(i);
+                    lat.stopWorking();
+                }
+
+                listenerThreadsAllowed = false;
+            }
+
+            synchronized (channels) {
+                shutdown = true;
+
+                for (int i = 0; i < channels.size(); i++) {
+                    Channel c = channels.elementAt(i);
+
+                    synchronized (c) {
+                        c.EOF = true;
+                        c.state = Channel.STATE_CLOSED;
+                        c.setReasonClosed("The connection is being shutdown");
+                        c.closeMessageRecv = true; /*
+                                                                                                                             * You never know, perhaps
+                                                                                                                             * we are waiting for a
+                                                                                                                             * pending close message
+                                                                                                                             * from the server...
+                                                                                                                             */
+                        c.notifyAll();
+                    }
+                }
+
+                /* Works with J2ME */
+                channels.setSize(0);
+                channels.trimToSize();
+                channels.notifyAll(); /* Notify global response waiters */
+                return;
+            }
+        }
+
+        switch (msg[0]) {
+            case Packets.SSH_MSG_CHANNEL_OPEN_CONFIRMATION:
+                msgChannelOpenConfirmation(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_WINDOW_ADJUST:
+                msgChannelWindowAdjust(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_DATA:
+                msgChannelData(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_EXTENDED_DATA:
+                msgChannelExtendedData(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_REQUEST:
+                msgChannelRequest(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_EOF:
+                msgChannelEOF(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_OPEN:
+                msgChannelOpen(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_CLOSE:
+                msgChannelClose(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_SUCCESS:
+                msgChannelSuccess(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_FAILURE:
+                msgChannelFailure(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_CHANNEL_OPEN_FAILURE:
+                msgChannelOpenFailure(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_GLOBAL_REQUEST:
+                msgGlobalRequest(msg, msglen);
+                break;
+
+            case Packets.SSH_MSG_REQUEST_SUCCESS:
+                msgGlobalSuccess();
+                break;
+
+            case Packets.SSH_MSG_REQUEST_FAILURE:
+                msgGlobalFailure();
+                break;
+
+            default:
+                throw new IOException("Cannot handle unknown channel message " + (msg[0] & 0xff));
+        }
+    }
+}