/// <summary>
/// Requests that the remote computer accepts socket connections and forward them to the local
/// computer. The <see cref="Maverick.SSH.ForwardingRequestListener"/> provides callback methods to create
/// the connections and to initialize the tunnel.
/// </summary>
/// <param name="bindAddress"></param>
/// <param name="bindPort"></param>
/// <param name="hostToConnect"></param>
/// <param name="portToConnect"></param>
/// <param name="listener"></param>
/// <returns></returns>
public bool RequestRemoteForwarding(String bindAddress,
int bindPort,
String hostToConnect,
int portToConnect,
ForwardingRequestListener listener)
{
if (listener == null)
{
throw new SSHException(
"You must specify a listener to receive connection requests",
SSHException.BAD_API_USAGE);
}
ByteBuffer baw = new ByteBuffer();
baw.WriteString(bindAddress);
baw.WriteInt(bindPort);
GlobalRequest request = new GlobalRequest("tcpip-forward",
baw.ToByteArray());
if (SendGlobalRequest(request, true))
{
forwardingListeners.Add((bindAddress + ":" + bindPort),
listener);
forwardingDestinations.Add((bindAddress + ":" + bindPort),
(hostToConnect + ":" + portToConnect));
// Setup the forwarding listener
return(true);
}
else
{
return(false);
}
}
internal void ProcessGlobalRequest(System.String requestname, bool wantreply, byte[] requestdata)
{
#if DEBUG
System.Diagnostics.Trace.WriteLine("Processing global request " + requestname);
#endif
try
{
bool success = false;
GlobalRequest request = new GlobalRequest(requestname, requestdata);
if (requesthandlers.ContainsKey(requestname))
{
#if DEBUG
System.Diagnostics.Trace.WriteLine("Found handler for request " + requestname);
#endif
success = ((GlobalRequestHandler)requesthandlers[requestname]).ProcessGlobalRequest(request);
}
#if DEBUG
else
{
System.Diagnostics.Trace.WriteLine("Cannot find handler for request " + requestname);
}
#endif
if (wantreply)
{
SSHPacket packet = GetPacket();
if (success)
{
packet.WriteByte(SSH_MSG_REQUEST_SUCCESS);
if (request.Data != null)
{
packet.WriteBytes(requestdata);
}
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_REQUEST_SUCCESS");
#endif
transport.SendMessage(packet);
}
else
{
// Return a response
packet.WriteByte(SSH_MSG_REQUEST_FAILURE);
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_REQUEST_FAILURE");
#endif
transport.SendMessage(packet);
}
}
}
catch (System.IO.IOException ex)
{
throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR);
}
}
/// <summary>
/// Sends a global request.
/// </summary>
/// <param name="request"></param>
/// <param name="wantreply"></param>
/// <returns></returns>
public bool SendGlobalRequest(GlobalRequest request, bool wantreply)
{
try
{
SSHPacket packet = GetPacket();
packet.WriteByte(SSH_MSG_GLOBAL_REQUEST);
packet.WriteString(request.Name);
packet.WriteBool(wantreply);
if (request.Data != null)
{
packet.WriteBytes(request.Data);
}
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_GLOBAL_REQUEST");
System.Diagnostics.Trace.WriteLine(request.Name);
#endif
SendMessage(packet);
if (wantreply)
{
packet = GlobalMessages.NextMessage(GLOBAL_REQUEST_MESSAGES);
if (packet.MessageID == SSH_MSG_REQUEST_SUCCESS)
{
if (packet.Available > 1)
{
byte[] tmp = new byte[packet.Available];
packet.ReadBytes(tmp);
request.Data = tmp;
}
else
{
request.Data = null;
}
return(true);
}
else
{
return(false);
}
}
else
{
return(true);
}
}
catch (System.IO.IOException ex)
{
throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR);
}
}
/// <summary>
/// Requests that the remote computer cancel an existing remote forwarding request.
/// </summary>
/// <param name="bindAddress"></param>
/// <param name="bindPort"></param>
/// <returns></returns>
public bool CancelRemoteForwarding(String bindAddress,
int bindPort)
{
ByteBuffer baw = new ByteBuffer();
baw.WriteString(bindAddress);
baw.WriteInt(bindPort);
GlobalRequest request = new GlobalRequest("cancel-tcpip-forward",
baw.ToByteArray());
if (SendGlobalRequest(request, true))
{
forwardingListeners.Remove(bindAddress + ":" + bindPort);
forwardingDestinations.Remove(bindAddress + ":" + bindPort);
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Send a global request
/// </summary>
/// <param name="request"></param>
/// <param name="wantreply"></param>
/// <returns></returns>
public bool SendGlobalRequest(GlobalRequest request, bool wantreply)
{
VerifyConnection(true);
return(connection.SendGlobalRequest(request, wantreply));
}
