/// <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);
}