/// <summary>
/// Disconnect the SSH transport protocol.
/// </summary>
/// <param name="disconnectReason">A descriptive reason for the disconnection.</param>
/// <param name="reason">The SSH reason code.</param>
public void Disconnect(String disconnectReason, DisconnectionReason reason)
{
try
{
this.disconnectReason = disconnectReason;
SSHPacket packet = GetSSHPacket(true);
packet.WriteByte(SSH_MSG_DISCONNECT);
packet.WriteUINT32((int)reason);
packet.WriteString(disconnectReason);
packet.WriteString("");
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_DISCONNECT");
System.Diagnostics.Trace.WriteLine(disconnectReason);
#endif
SendMessage(packet);
}
catch
{
}
finally
{
InternalDisconnect();
}
}
internal void SendChannelData(byte[] buf, int offset, int len)
{
try
{
if (state != CHANNEL_OPEN)
{
throw new SSHException("The channel is closed", SSHException.CHANNEL_FAILURE);
}
if (len > 0)
{
SSHPacket packet = connection.GetPacket();
packet.WriteByte((System.Byte)SSH_MSG_CHANNEL_DATA);
packet.WriteUINT32(remoteid);
packet.WriteBinaryString(buf, offset, len);
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_DATA");
System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID);
#endif
connection.SendMessage(packet);
}
}
catch (System.IO.IOException ex)
{
throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR);
}
}
/// <summary>
/// Close down the output side of the stream.
/// </summary>
/// <remarks>
/// This method sends an SSH_MSG_CHANNEL_EOF message to the remote side.
/// </remarks>
public override void CloseOutput()
{
if (!channel.IsClosed && !outputEOF && !channel.closing && !channel.remoteClosed)
{
SSHPacket packet = channel.connection.GetPacket();
packet.WriteByte(SSH_MSG_CHANNEL_EOF);
packet.WriteUINT32(channel.remoteid);
try
{
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_EOF");
System.Diagnostics.Trace.WriteLine("Channelid=" + channel.ChannelID);
#endif
channel.connection.SendMessage(packet);
}
finally
{
outputEOF = true;
channel.FireEvent(channel, ChannelState.LOCAL_EOF);
}
}
outputEOF = true;
}
internal void AdjustWindow(int increment)
{
try
{
SSHPacket packet = connection.GetPacket();
packet.WriteByte((System.Byte)SSH_MSG_WINDOW_ADJUST);
packet.WriteUINT32(remoteid);
packet.WriteUINT32(increment);
localwindow.adjust(increment);
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_WINDOW_ADJUST");
System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID);
#endif
connection.SendMessage(packet);
}
catch (System.IO.IOException ex)
{
throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR);
}
}
/// <summary>
/// Sends a close message to the remote side without waiting for a reply
/// </summary>
public override void SendAsyncClose()
{
bool performClose = false;
lock (this)
{
if (!closing)
{
performClose = closing = true;
}
}
if (state == CHANNEL_OPEN && performClose)
{
try
{
// Close the ChannelOutputStream
stream.Close();
// Send our close message
SSHPacket packet = connection.GetPacket();
packet.WriteByte((System.Byte)SSH_MSG_CHANNEL_CLOSE);
packet.WriteUINT32(remoteid);
try
{
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_CLOSE");
System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID);
#endif
connection.SendMessage(packet);
}
catch (SSHException)
{
}
}
catch (System.IO.EndOfStreamException)
{
// Ignore this is the message store informing of close/eof
}
catch (System.IO.IOException ex)
{
// IO Error during close so the connection has dropped
connection.SignalClosingState();
connection.transport.Disconnect("IOException during channel close: " + ex.Message,
DisconnectionReason.CONNECTION_LOST);
}
}
}
internal void SendKeyExchangeInit()
{
try
{
FireStateChange(TransportProtocolState.PERFORMING_KEYEXCHANGE);
numIncomingBytesSinceKEX = 0;
numIncomingSSHPacketsSinceKEX = 0;
numOutgoingBytesSinceKEX = 0;
numOutgoingSSHPacketsSinceKEX = 0;
currentState = TransportProtocolState.PERFORMING_KEYEXCHANGE;
SSHPacket packet = GetSSHPacket(true);
SSH2Context transportContext = (SSH2Context)client.Context;
byte[] cookie = new byte[16];
rnd.GetBytes(cookie);
packet.WriteByte((byte)SSH_MSG_KEX_INIT);
packet.WriteBytes(cookie);
packet.WriteString("diffie-hellman-group1-sha1");
packet.WriteString(transportContext.SupportedPublicKeys.List(transportContext.PreferredPublicKey));
packet.WriteString(transportContext.SupportedCiphers.List(transportContext.PreferredCipherCS));
packet.WriteString(transportContext.SupportedCiphers.List(transportContext.PreferredCipherSC));
packet.WriteString(transportContext.SupportedMACs.List(transportContext.PreferredMacCS));
packet.WriteString(transportContext.SupportedMACs.List(transportContext.PreferredMacSC));
packet.WriteString("none");
packet.WriteString("none");
packet.WriteString("");
packet.WriteString("");
packet.WriteByte((byte)0);
packet.WriteUINT32(0);
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_KEX_INIT");
#endif
localkex = SendMessage(packet, true);
}
catch (System.IO.IOException ex)
{
throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR);
}
}
/// <summary>
/// Sends a channel request. Many channels have extensions that are specific to that particular
/// channel type, an example of which is requesting a pseudo terminal from an interactive session.
/// </summary>
/// <param name="requesttype">the name of the request, for example "pty-req"</param>
/// <param name="wantreply">specifies whether the remote side should send a success/failure message</param>
/// <param name="requestdata">the request data</param>
/// <returns></returns>
public bool SendRequest(System.String requesttype, bool wantreply, byte[] requestdata)
{
lock (this)
{
try
{
SSHPacket packet = connection.GetPacket();
packet.WriteByte((System.Byte)SSH_MSG_CHANNEL_REQUEST);
packet.WriteUINT32(remoteid);
packet.WriteString(requesttype);
packet.WriteBool(wantreply);
if (requestdata != null)
{
packet.WriteBytes(requestdata);
}
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_REQUEST " + requesttype);
System.Diagnostics.Trace.WriteLine("Channelid=" + ChannelID);
#endif
connection.SendMessage(packet);
bool result = false;
if (wantreply)
{
packet = ProcessMessages(CHANNEL_REQUEST_MESSAGES);
return(packet.MessageID == SSH_MSG_CHANNEL_SUCCESS);
}
return(result);
}
catch (System.IO.IOException ex)
{
throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR);
}
}
}
/// <summary>
/// Send a message to the remote side of the connection.
/// </summary>
/// <param name="packet"></param>
/// <param name="returnPayload">Return the unecrypted payload of this packet.</param>
public byte[] SendMessage(SSHPacket packet, bool returnPayload)
{
byte[] payload = null;
lock (this)
{
if (currentState == TransportProtocolState.PERFORMING_KEYEXCHANGE &&
!IsTransportMessage(packet.MessageID))
{
lock (kexqueue)
{
kexqueue.Add(packet);
return(payload);
}
}
try
{
int padding = 4;
// Compress the payload if necersary
/*if (outgoingCompression != null)
* {
* msgdata = outgoingCompression.compress(msgdata, 0, msgdata.Length);
* }*/
// Determine the padding length
padding += ((outgoingCipherLength - ((packet.Length + padding) % outgoingCipherLength)) % outgoingCipherLength);
packet.MoveToPosition(0);
// Write the packet length field
packet.WriteUINT32(packet.Length - 4 + padding);
// Write the padding length
packet.WriteByte((byte)padding);
// Now skip back up to the end of the packet
packet.MoveToEnd();
if (returnPayload)
{
payload = packet.Payload;
}
// Create some random data for the padding
byte[] pad = new byte[padding];
rnd.GetBytes(pad);
packet.WriteBytes(pad);
// Generate the MAC
if (outgoingMac != null)
{
outgoingMac.Generate(outgoingSequence, packet.Array, 0, packet.Length, packet.Array, packet.Length);
}
// Perfrom encrpytion
if (encryption != null)
{
encryption.Transform(packet.Array, 0, packet.Array, 0, packet.Length);
}
packet.Skip(outgoingMacLength);
outgoingBytes += packet.Length;
// Send!
packet.WriteToStream(transport.GetStream());
outgoingSequence++;
numOutgoingBytesSinceKEX += (uint)packet.Length;
numOutgoingSSHPacketsSinceKEX++;
ReleaseSSHPacket(packet);
if (outgoingSequence > 4294967295)
{
outgoingSequence = 0;
}
if (numOutgoingBytesSinceKEX >= MAX_NUM_BYTES_BEFORE_REKEY ||
numOutgoingSSHPacketsSinceKEX >= MAX_NUM_PACKETS_BEFORE_REKEY)
{
SendKeyExchangeInit();
}
}
catch (System.IO.IOException ex)
{
InternalDisconnect();
throw new SSHException("Unexpected termination: " + ex.Message, SSHException.UNEXPECTED_TERMINATION);
}
catch (System.ObjectDisposedException ex)
{
InternalDisconnect();
throw new SSHException("Unexpected terminaton: " + ex.Message,
SSHException.UNEXPECTED_TERMINATION);
}
}
return(payload);
}
/// <summary>
/// Process a channel open request.
/// </summary>
/// <param name="type"></param>
/// <param name="remoteid"></param>
/// <param name="remotewindow"></param>
/// <param name="remotepacket"></param>
/// <param name="requestdata"></param>
internal void ProcessChannelOpenRequest(System.String type, int remoteid, int remotewindow, int remotepacket, byte[] requestdata)
{
try
{
SSHPacket packet = GetPacket();
if (channelfactories.ContainsKey(type))
{
try
{
SSH2Channel channel = ((ChannelFactory)channelfactories[type]).CreateChannel(type, requestdata);
// Allocate a channel
int localid = AllocateChannel(channel);
if (localid > -1)
{
try
{
channel.Init(this, localid);
byte[] responsedata = channel.Create();
packet.WriteByte(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
packet.WriteUINT32(remoteid);
packet.WriteUINT32(localid);
packet.WriteUINT32(channel.WindowSize);
packet.WriteUINT32(channel.PacketSize);
if (responsedata != null)
{
packet.WriteBytes(requestdata);
}
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_OPEN_CONFIRMATION");
System.Diagnostics.Trace.WriteLine("Channelid=" + localid);
System.Diagnostics.Trace.WriteLine("Remoteid=" + remoteid);
#endif
transport.SendMessage(packet);
channel.Open(remoteid, remotewindow, remotepacket);
return;
}
catch (SSHException ex)
{
#if DEBUG
System.Diagnostics.Trace.WriteLine("Exception occured whilst opening channel");
System.Diagnostics.Trace.WriteLine(ex.StackTrace);
#endif
packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE);
packet.WriteUINT32(remoteid);
packet.WriteUINT32(ChannelOpenException.CONNECT_FAILED);
packet.WriteString(ex.Message);
packet.WriteString("");
}
}
else
{
#if DEBUG
System.Diagnostics.Trace.WriteLine("Maximum allowable open channel limit of " + MaximumNumChannels + " exceeded!");
#endif
packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE);
packet.WriteUINT32(remoteid);
packet.WriteUINT32(ChannelOpenException.RESOURCE_SHORTAGE);
packet.WriteString("Maximum allowable open channel limit of " + MaximumNumChannels + " exceeded!");
packet.WriteString("");
}
}
catch (ChannelOpenException ex)
{
#if DEBUG
System.Diagnostics.Trace.WriteLine("Channel open exception occured whilst opening channel");
System.Diagnostics.Trace.WriteLine(ex.StackTrace);
#endif
packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE);
packet.WriteUINT32(remoteid);
packet.WriteUINT32(ex.Reason);
packet.WriteString(ex.Message);
packet.WriteString("");
}
}
else
{
#if DEBUG
System.Diagnostics.Trace.WriteLine(type + " is not a supported channel type");
#endif
packet.WriteByte(SSH_MSG_CHANNEL_OPEN_FAILURE);
packet.WriteUINT32(remoteid);
packet.WriteUINT32(ChannelOpenException.UNKNOWN_CHANNEL_TYPE);
packet.WriteString(type + " is not a supported channel type!");
packet.WriteString("");
}
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_OPEN_FAILURE");
System.Diagnostics.Trace.WriteLine("Remoteid=" + remoteid);
System.Diagnostics.Trace.WriteLine("Name=" + type);
#endif
transport.SendMessage(packet);
}
catch (System.IO.IOException ex1)
{
throw new SSHException(ex1.Message, SSHException.INTERNAL_ERROR);
}
}
/// <summary>
/// Opens a channel
/// </summary>
/// <param name="channel"></param>
/// <param name="requestdata"></param>
public void OpenChannel(SSH2Channel channel, byte[] requestdata)
{
lock (this)
{
try
{
int channelid = AllocateChannel(channel);
if (channelid == -1)
{
throw new ChannelOpenException("Maximum number of channels exceeded",
ChannelOpenException.RESOURCE_SHORTAGE);
}
channel.Init(this, channelid);
SSHPacket packet = GetPacket();
packet.WriteByte(SSH_MSG_CHANNEL_OPEN);
packet.WriteString(channel.Name);
packet.WriteUINT32(channel.ChannelID);
packet.WriteUINT32(channel.WindowSize);
packet.WriteUINT32(channel.PacketSize);
if (requestdata != null)
{
packet.WriteBytes(requestdata);
}
#if DEBUG
System.Diagnostics.Trace.WriteLine("Sending SSH_MSG_CHANNEL_OPEN");
System.Diagnostics.Trace.WriteLine("Channelid=" + channel.ChannelID);
System.Diagnostics.Trace.WriteLine("Name=" + channel.Name);
#endif
transport.SendMessage(packet);
packet = channel.MessageStore.NextMessage(CHANNEL_OPEN_RESPONSE_MESSAGES);
#if DEBUG
System.Diagnostics.Trace.WriteLine("Received reply to SSH_MSG_CHANNEL_OPEN");
channel.LogMessage(packet);
#endif
if (packet.MessageID == SSH_MSG_CHANNEL_OPEN_FAILURE)
{
FreeChannel(channel);
int reason = (int)packet.ReadUINT32();
throw new ChannelOpenException(packet.ReadString(), reason);
}
else
{
int remoteid = (int)packet.ReadUINT32();
int remotewindow = (int)packet.ReadUINT32();
int remotepacket = (int)packet.ReadUINT32();
byte[] responsedata = new byte[packet.Available];
packet.ReadBytes(responsedata);
channel.Open(remoteid, remotewindow, remotepacket, responsedata);
return;
}
}
catch (System.IO.IOException ex)
{
throw new SSHException(ex.Message, SSHException.INTERNAL_ERROR);
}
}
}
