private void OpenShell(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader reader)
{
if(_negotiationStatus==3) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(null, "opening channel failed; packet type="+pt);
else {
int errcode = reader.ReadInt32();
string msg = Encoding.ASCII.GetString(reader.ReadString());
receiver.OnChannelError(null, msg);
}
Close();
}
else {
_remoteID = reader.ReadInt32();
_serverMaxPacketSize = reader.ReadInt32();
//open pty
SSH2DataWriter wr = new SSH2DataWriter();
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST);
wr.Write(_remoteID);
wr.Write("pty-req");
wr.Write(true);
wr.Write(_connection.Param.TerminalName);
wr.Write(_connection.Param.TerminalWidth);
wr.Write(_connection.Param.TerminalHeight);
wr.Write(_connection.Param.TerminalPixelWidth);
wr.Write(_connection.Param.TerminalPixelHeight);
wr.WriteAsString(new byte[0]);
TransmitPacket(wr.ToByteArray());
_negotiationStatus = 2;
}
}
else if(_negotiationStatus==2) {
if(pt!=PacketType.SSH_MSG_CHANNEL_SUCCESS) {
receiver.OnChannelError(null, "opening pty failed");
Close();
}
else {
//open shell
SSH2DataWriter wr = new SSH2DataWriter();
wr.Write((byte)PacketType.SSH_MSG_CHANNEL_REQUEST);
wr.Write(_remoteID);
wr.Write("shell");
wr.Write(true);
TransmitPacket(wr.ToByteArray());
_negotiationStatus = 1;
}
}
else if(_negotiationStatus==1) {
if(pt!=PacketType.SSH_MSG_CHANNEL_SUCCESS) {
receiver.OnChannelError(null, "Opening shell failed: packet type="+pt.ToString());
Close();
}
else {
receiver.OnChannelReady();
_negotiationStatus = 0; //goal!
}
}
else
Debug.Assert(false);
}
private void ReceivePortForwardingResponse(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader reader)
{
if(_negotiationStatus==1) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(null, "opening channel failed; packet type="+pt);
else {
int errcode = reader.ReadInt32();
string msg = Encoding.ASCII.GetString(reader.ReadString());
receiver.OnChannelError(null, msg);
}
Close();
}
else {
_remoteID = reader.ReadInt32();
_serverMaxPacketSize = reader.ReadInt32();
_negotiationStatus = 0;
receiver.OnChannelReady();
}
}
else
Debug.Assert(false);
}
// sending "exec" service for SCP protocol.
private void ExecCommand(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader reader) {
if(_negotiationStatus==NegotiationStatus.WaitingChannelConfirmation) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(new SSHException("opening channel failed; packet type="+pt));
else {
int errcode = reader.ReadInt32();
string msg = Encoding.ASCII.GetString(reader.ReadString());
receiver.OnChannelError(new SSHException(msg));
}
Close();
}
else {
_remoteID = reader.ReadInt32();
_allowedDataSize = reader.ReadInt32();
_serverMaxPacketSize = reader.ReadInt32();
// exec command
SSH2DataWriter wr = new SSH2DataWriter();
SSHConnectionParameter param = _connection.Param;
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST);
wr.Write(_remoteID);
wr.Write("exec"); // "exec"
wr.Write(false); // want confirm is disabled. (*)
wr.Write(_command);
if (_connection.IsEventTracerAvailable)
_connection.TraceTransmissionEvent("exec command","cmd={0}", _command);
TransmitPayload(wr.ToByteArray());
//confirmation is omitted
receiver.OnChannelReady();
_negotiationStatus = NegotiationStatus.Ready; //goal!
}
}
else if(_negotiationStatus==NegotiationStatus.WaitingExecCmdConfirmation) {
if(pt!=PacketType.SSH_MSG_CHANNEL_DATA) {
receiver.OnChannelError(new SSHException("exec command failed"));
Close();
}
else {
receiver.OnChannelReady();
_negotiationStatus = NegotiationStatus.Ready; //goal!
}
}
else
throw new SSHException("internal state error");
}
private void EstablishSession(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader reader) {
if(_negotiationStatus==NegotiationStatus.WaitingChannelConfirmation) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(new SSHException("opening channel failed; packet type="+pt));
else {
int remote_id = reader.ReadInt32();
int errcode = reader.ReadInt32();
string msg = Encoding.ASCII.GetString(reader.ReadString());
receiver.OnChannelError(new SSHException(msg));
}
Close();
}
else {
_remoteID = reader.ReadInt32();
_serverMaxPacketSize = reader.ReadInt32();
_negotiationStatus = NegotiationStatus.Ready;
receiver.OnChannelReady();
}
}
else
throw new SSHException("internal state error");
}
private void OpenShellOrSubsystem(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader reader, string scheme) {
if(_negotiationStatus==NegotiationStatus.WaitingChannelConfirmation) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(new SSHException("opening channel failed; packet type="+pt));
else {
int errcode = reader.ReadInt32();
string msg = Encoding.ASCII.GetString(reader.ReadString());
receiver.OnChannelError(new SSHException(msg));
}
Close();
}
else {
_remoteID = reader.ReadInt32();
_allowedDataSize = reader.ReadInt32();
_serverMaxPacketSize = reader.ReadInt32();
//open pty
SSH2DataWriter wr = new SSH2DataWriter();
SSHConnectionParameter param = _connection.Param;
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST);
wr.Write(_remoteID);
wr.Write("pty-req");
wr.Write(true);
wr.Write(param.TerminalName);
wr.Write(param.TerminalWidth);
wr.Write(param.TerminalHeight);
wr.Write(param.TerminalPixelWidth);
wr.Write(param.TerminalPixelHeight);
wr.WriteAsString(new byte[0]);
if(_connection.IsEventTracerAvailable)
_connection.TraceTransmissionEvent(PacketType.SSH_MSG_CHANNEL_REQUEST, "pty-req", "terminal={0} width={1} height={2}", param.TerminalName, param.TerminalWidth, param.TerminalHeight);
TransmitPayload(wr.ToByteArray());
_negotiationStatus = NegotiationStatus.WaitingPtyReqConfirmation;
}
}
else if(_negotiationStatus==NegotiationStatus.WaitingPtyReqConfirmation) {
if(pt!=PacketType.SSH_MSG_CHANNEL_SUCCESS) {
receiver.OnChannelError(new SSHException("opening pty failed"));
Close();
}
else {
//agent request (optional)
if(_connection.Param.AgentForward!=null) {
SSH2DataWriter wr = new SSH2DataWriter();
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_REQUEST);
wr.Write(_remoteID);
wr.Write("*****@*****.**");
wr.Write(true);
_connection.TraceTransmissionEvent(PacketType.SSH_MSG_CHANNEL_REQUEST, "auth-agent-req", "");
TransmitPayload(wr.ToByteArray());
_negotiationStatus = NegotiationStatus.WaitingAuthAgentReqConfirmation;
}
else {
OpenScheme(scheme);
_negotiationStatus = NegotiationStatus.WaitingShellConfirmation;
}
}
}
else if(_negotiationStatus==NegotiationStatus.WaitingAuthAgentReqConfirmation) {
if(pt!=PacketType.SSH_MSG_CHANNEL_SUCCESS && pt!=PacketType.SSH_MSG_CHANNEL_FAILURE) {
receiver.OnChannelError(new SSHException("auth-agent-req error"));
Close();
}
else { //auth-agent-req is optional
_connection.SetAgentForwardConfirmed(pt==PacketType.SSH_MSG_CHANNEL_SUCCESS);
_connection.TraceReceptionEvent(pt, "auth-agent-req");
OpenScheme(scheme);
_negotiationStatus = NegotiationStatus.WaitingShellConfirmation;
}
}
else if(_negotiationStatus==NegotiationStatus.WaitingShellConfirmation) {
if(pt!=PacketType.SSH_MSG_CHANNEL_SUCCESS) {
receiver.OnChannelError(new SSHException("Opening shell failed: packet type="+pt.ToString()));
Close();
}
else {
receiver.OnChannelReady();
_negotiationStatus = NegotiationStatus.Ready; //goal!
}
}
}
public void OnError(Exception error, string msg)
{
_handler.OnChannelError(error, msg);
}
private void ReceivePortForwardingResponse(ISSHChannelEventReceiver receiver, SSH2PacketType pt, SSH2DataReader reader)
{
if (_negotiationStatus == NegotiationStatus.WaitingChannelConfirmation) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(new SSHException("opening channel failed; packet type=" + pt));
else {
int errcode = reader.ReadInt32();
string msg = reader.ReadUTF8String();
receiver.OnChannelError(new SSHException(msg));
}
Close();
}
else {
_remoteID = reader.ReadInt32();
_serverMaxPacketSize = reader.ReadInt32();
_negotiationStatus = NegotiationStatus.Ready;
receiver.OnChannelReady();
}
}
else
throw new SSHException("internal state error");
}
private void OpenShellOrSubsystem(ISSHChannelEventReceiver receiver, SSH2PacketType pt, SSH2DataReader reader, string scheme)
{
if (_negotiationStatus == NegotiationStatus.WaitingChannelConfirmation) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(new SSHException("opening channel failed; packet type=" + pt));
else {
int errcode = reader.ReadInt32();
string msg = reader.ReadUTF8String();
receiver.OnChannelError(new SSHException(msg));
}
// Close() shouldn't be called because remote channel number is not given yet.
// We just remove an event receiver from the collection of channels.
// FIXME: _negotiationStatus sould be set an error status ?
_connection.ChannelCollection.UnregisterChannelEventReceiver(_localID);
}
else {
_remoteID = reader.ReadInt32();
_allowedDataSize = reader.ReadUInt32();
_serverMaxPacketSize = reader.ReadInt32();
if (_type == ChannelType.Subsystem) {
OpenScheme(scheme);
_negotiationStatus = NegotiationStatus.WaitingSubsystemConfirmation;
}
else {
//open pty
SSHConnectionParameter param = _connection.Param;
Transmit(
0,
new SSH2Packet(SSH2PacketType.SSH_MSG_CHANNEL_REQUEST)
.WriteInt32(_remoteID)
.WriteString("pty-req")
.WriteBool(true)
.WriteString(param.TerminalName)
.WriteInt32(param.TerminalWidth)
.WriteInt32(param.TerminalHeight)
.WriteInt32(param.TerminalPixelWidth)
.WriteInt32(param.TerminalPixelHeight)
.WriteAsString(new byte[0])
);
if (_connection.IsEventTracerAvailable) {
_connection.TraceTransmissionEvent(
SSH2PacketType.SSH_MSG_CHANNEL_REQUEST, "pty-req", "terminal={0} width={1} height={2}",
param.TerminalName, param.TerminalWidth, param.TerminalHeight);
}
_negotiationStatus = NegotiationStatus.WaitingPtyReqConfirmation;
}
}
}
else if (_negotiationStatus == NegotiationStatus.WaitingPtyReqConfirmation) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_SUCCESS) {
receiver.OnChannelError(new SSHException("opening pty failed"));
Close();
}
else {
//agent request (optional)
if (_connection.Param.AgentForward != null) {
Transmit(
0,
new SSH2Packet(SSH2PacketType.SSH_MSG_CHANNEL_REQUEST)
.WriteInt32(_remoteID)
.WriteString("*****@*****.**")
.WriteBool(true)
);
_connection.TraceTransmissionEvent(SSH2PacketType.SSH_MSG_CHANNEL_REQUEST, "auth-agent-req", "");
_negotiationStatus = NegotiationStatus.WaitingAuthAgentReqConfirmation;
}
else {
OpenScheme(scheme);
_negotiationStatus = NegotiationStatus.WaitingShellConfirmation;
}
}
}
else if (_negotiationStatus == NegotiationStatus.WaitingAuthAgentReqConfirmation) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_SUCCESS && pt != SSH2PacketType.SSH_MSG_CHANNEL_FAILURE) {
receiver.OnChannelError(new SSHException("auth-agent-req error"));
Close();
}
else { //auth-agent-req is optional
_connection.SetAgentForwardConfirmed(pt == SSH2PacketType.SSH_MSG_CHANNEL_SUCCESS);
_connection.TraceReceptionEvent(pt, "auth-agent-req");
OpenScheme(scheme);
_negotiationStatus = NegotiationStatus.WaitingShellConfirmation;
}
}
else if (_negotiationStatus == NegotiationStatus.WaitingShellConfirmation) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_SUCCESS) {
receiver.OnChannelError(new SSHException("Opening shell failed: packet type=" + pt.ToString()));
Close();
}
else {
receiver.OnChannelReady();
_negotiationStatus = NegotiationStatus.Ready; //goal!
}
}
else if (_negotiationStatus == NegotiationStatus.WaitingSubsystemConfirmation) {
if (pt != SSH2PacketType.SSH_MSG_CHANNEL_SUCCESS) {
receiver.OnChannelError(new SSHException("Opening subsystem failed: packet type=" + pt.ToString()));
Close();
}
else {
receiver.OnChannelReady();
_negotiationStatus = NegotiationStatus.Ready; //goal!
}
}
}
private void EstablishSession(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader reader)
{
if(_negotiationStatus==1) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION) {
if(pt!=PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE)
receiver.OnChannelError(null, "opening channel failed; packet type="+pt);
else {
int remote_id = reader.ReadInt32();
int errcode = reader.ReadInt32();
byte[] tmpdata = reader.ReadString();
string msg = Encoding.UTF8.GetString(tmpdata, 0, tmpdata.Length);
receiver.OnChannelError(null, msg);
}
Close();
}
else {
_remoteID = reader.ReadInt32();
_serverMaxPacketSize = reader.ReadInt32();
_negotiationStatus = 0;
receiver.OnChannelReady();
}
}
else
Debug.Assert(false);
}