public SSHChannel OpenShell(ISSHChannelEventReceiver receiver)
{
_channel_entry = new TelnetChannel(this, socket, receiver);
TelnetPacketBuilder pb = new TelnetPacketBuilder(receiver);
PlainSocket ps = new PlainSocket(socket, pb);
ps.RepeatAsyncRead();
return(_channel_entry);
}
public override SSHChannel OpenShell(ISSHChannelEventReceiver receiver)
{
if (_shellID != -1)
{
throw new SSHException("A shell is opened already");
}
_shellID = _channel_collection.RegisterChannelEventReceiver(null, receiver).LocalID;
SendRequestPTY();
_executingShell = true;
return(new SSH1Channel(this, ChannelType.Shell, _shellID));
}
public override void EstablishPortforwarding(ISSHChannelEventReceiver receiver, SSHChannel channel)
{
try {
Channel ch = (Channel)receiver;
ch.FixChannel(channel);
ch.OnChannelReady();
ch.StartAsyncReceive();
}
catch (Exception ex) {
Debug.WriteLine(ex.StackTrace);
Util.InterThreadWarning(ex.Message);
}
}
public Entry RegisterChannelEventReceiver(SSHChannel ch, ISSHChannelEventReceiver r) {
lock (this) {
Entry e = new Entry(ch, r, _channel_sequence++);
if (_first == null)
_first = e;
else {
e.Next = _first;
_first = e;
}
_count++;
return e;
}
}
public Entry RegisterChannelEventReceiver(SSHChannel ch, ISSHChannelEventReceiver r)
{
lock (this) {
Entry e = new Entry(ch, r, _channel_sequence++);
if (_first == null)
{
_first = e;
}
else
{
e.Next = _first;
_first = e;
}
_count++;
return(e);
}
}
protected ChannelEntry RegisterChannelEventReceiver(SSHChannel ch, ISSHChannelEventReceiver r)
{
lock (this) {
ChannelEntry e = new ChannelEntry();
e._channel = ch;
e._receiver = r;
e._localID = _channel_sequence++;
for (int i = 0; i < _channel_entries.Count; i++)
{
if (_channel_entries[i] == null)
{
_channel_entries[i] = e;
return(e);
}
}
_channel_entries.Add(e);
return(e);
}
}
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port)
{
if (_shellID == -1)
{
ExecShell();
_shellID = RegisterChannelEventReceiver(null, new SSH1DummyReceiver())._localID;
}
int local_id = this.RegisterChannelEventReceiver(null, receiver)._localID;
SSH1DataWriter writer = new SSH1DataWriter();
writer.Write(local_id); //channel id is fixed to 0
writer.Write(remote_host);
writer.Write(remote_port);
//originator is specified only if SSH_PROTOFLAG_HOST_IN_FWD_OPEN is specified
//writer.Write(originator_host);
SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_MSG_PORT_OPEN, writer.ToByteArray());
SSH1Packet.WriteTo(_stream, _tCipher);
return(new SSH1Channel(this, ChannelType.ForwardedLocalToRemote, local_id));
}
internal void ProcessPacket(ISSHChannelEventReceiver receiver, PacketType pt, int data_length, SSH2DataReader re)
{
//NOTE: the offset of 're' is next to 'receipiant channel' field
_leftWindowSize -= data_length;
while(_leftWindowSize <= _windowSize) {
SSH2DataWriter adj = new SSH2DataWriter();
adj.WritePacketType(PacketType.SSH_MSG_CHANNEL_WINDOW_ADJUST);
adj.Write(_remoteID);
adj.Write(_windowSize);
TransmitPacket(adj.ToByteArray());
_leftWindowSize += _windowSize;
//Debug.WriteLine("Window size is adjusted to " + _leftWindowSize);
}
if(pt==PacketType.SSH_MSG_CHANNEL_WINDOW_ADJUST) {
int w = re.ReadInt32();
//Debug.WriteLine(String.Format("Window Adjust +={0}",w));
}
else if(_negotiationStatus!=0) { //when the negotiation is not completed
if(_type==ChannelType.Shell)
OpenShell(receiver, pt, re);
else if(_type==ChannelType.ForwardedLocalToRemote)
ReceivePortForwardingResponse(receiver, pt, re);
else if(_type==ChannelType.Session)
EstablishSession(receiver, pt, re);
}
else {
switch(pt) {
case PacketType.SSH_MSG_CHANNEL_DATA: {
int len = re.ReadInt32();
receiver.OnData(re.Image, re.Offset, len);
}
break;
case PacketType.SSH_MSG_CHANNEL_EXTENDED_DATA: {
int t = re.ReadInt32();
byte[] data = re.ReadString();
receiver.OnExtendedData(t, data);
}
break;
case PacketType.SSH_MSG_CHANNEL_REQUEST: {
string request = Encoding.ASCII.GetString(re.ReadString());
bool reply = re.ReadBool();
if(request=="exit-status") {
int status = re.ReadInt32();
}
else if(reply) { //we reject unknown requests including keep-alive check
SSH2DataWriter wr = new SSH2DataWriter();
wr.Write((byte)PacketType.SSH_MSG_CHANNEL_FAILURE);
wr.Write(_remoteID);
TransmitPacket(wr.ToByteArray());
}
}
break;
case PacketType.SSH_MSG_CHANNEL_EOF:
receiver.OnChannelEOF();
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE:
_connection.UnregisterChannelEventReceiver(_localID);
receiver.OnChannelClosed();
break;
case PacketType.SSH_MSG_CHANNEL_FAILURE:
case PacketType.SSH_MSG_CHANNEL_SUCCESS:
receiver.OnMiscPacket((byte)pt, re.Image, re.Offset, re.Rest);
break;
default:
receiver.OnMiscPacket((byte)pt, re.Image, re.Offset, re.Rest);
Debug.WriteLine("Unknown Packet "+pt);
break;
}
}
}
public Entry(SSHChannel ch, ISSHChannelEventReceiver r, int seq) {
_channel = ch;
_receiver = r;
_localID = seq;
}
protected ChannelEntry RegisterChannelEventReceiver(SSHChannel ch, ISSHChannelEventReceiver r)
{
lock(this) {
ChannelEntry e = new ChannelEntry();
e._channel = ch;
e._receiver = r;
e._localID = _channel_sequence++;
for(int i=0; i<_channel_entries.Count; i++) {
if(_channel_entries[i]==null) {
_channel_entries[i] = e;
return e;
}
}
_channel_entries.Add(e);
return e;
}
}
/** * forwards the remote end to another host */ public abstract SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port);
public virtual void EstablishPortforwarding(ISSHChannelEventReceiver receiver, SSHChannel channel)
{
}
public override SSHChannel OpenShell(ISSHChannelEventReceiver receiver)
{
if (_shellID != -1)
throw new SSHException("A shell is opened already");
_shellID = _channel_collection.RegisterChannelEventReceiver(null, receiver).LocalID;
SendRequestPTY();
_executingShell = true;
return new SSH1Channel(this, ChannelType.Shell, _shellID);
}
public Entry(SSHChannel ch, ISSHChannelEventReceiver r, int seq)
{
_channel = ch;
_receiver = r;
_localID = seq;
}
public override SSHChannel OpenShell(ISSHChannelEventReceiver receiver) {
return DoExecCommandInternal(receiver, ChannelType.Shell, null, "opening shell");
}
public abstract SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command);
internal void AsyncReceivePacket(SSH1Packet p)
{
try {
int len = 0, channel = 0;
switch (p.Type)
{
case PacketType.SSH_SMSG_STDOUT_DATA:
len = SSHUtil.ReadInt32(p.Data, 0);
FindChannelEntry(_shellID)._receiver.OnData(p.Data, 4, len);
break;
case PacketType.SSH_SMSG_STDERR_DATA: {
SSH1DataReader re = new SSH1DataReader(p.Data);
FindChannelEntry(_shellID)._receiver.OnExtendedData((int)PacketType.SSH_SMSG_STDERR_DATA, re.ReadString());
}
break;
case PacketType.SSH_MSG_CHANNEL_DATA:
channel = SSHUtil.ReadInt32(p.Data, 0);
len = SSHUtil.ReadInt32(p.Data, 4);
FindChannelEntry(channel)._receiver.OnData(p.Data, 8, len);
break;
case PacketType.SSH_MSG_PORT_OPEN:
this.ProcessPortforwardingRequest(_eventReceiver, p);
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE: {
channel = SSHUtil.ReadInt32(p.Data, 0);
ISSHChannelEventReceiver r = FindChannelEntry(channel)._receiver;
UnregisterChannelEventReceiver(channel);
r.OnChannelClosed();
}
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE_CONFIRMATION:
channel = SSHUtil.ReadInt32(p.Data, 0);
break;
case PacketType.SSH_MSG_DISCONNECT:
_eventReceiver.OnConnectionClosed();
break;
case PacketType.SSH_SMSG_EXITSTATUS:
FindChannelEntry(_shellID)._receiver.OnChannelClosed();
break;
case PacketType.SSH_MSG_DEBUG: {
SSH1DataReader re = new SSH1DataReader(p.Data);
_eventReceiver.OnDebugMessage(false, re.ReadString());
}
break;
case PacketType.SSH_MSG_IGNORE: {
SSH1DataReader re = new SSH1DataReader(p.Data);
_eventReceiver.OnIgnoreMessage(re.ReadString());
}
break;
case PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION: {
int local = SSHUtil.ReadInt32(p.Data, 0);
int remote = SSHUtil.ReadInt32(p.Data, 4);
FindChannelEntry(local)._receiver.OnChannelReady();
}
break;
case PacketType.SSH_SMSG_SUCCESS:
if (_executingShell)
{
ExecShell();
this.FindChannelEntry(_shellID)._receiver.OnChannelReady();
_executingShell = false;
}
break;
default:
_eventReceiver.OnUnknownMessage((byte)p.Type, p.Data);
break;
}
}
catch (Exception ex) {
if (!_closed)
{
_eventReceiver.OnError(ex, ex.Message);
}
}
}
public void EstablishPortforwarding(ISSHChannelEventReceiver receiver, SSHChannel channel)
{
Channel = channel;
}
/// <summary>
/// Sending exec command for SCP.
/// </summary>
/// <param name="receiver"></param>
/// <param name="command"></param>
/// <returns></returns>
public override SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command)
{
SendExecCommand();
return(null);
}
public TelnetChannel(TelnetConnection parent, StreamSocket socket, ISSHChannelEventReceiver r)
{
_parent = parent;
_socket = socket;
_receiver = r;
}
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);
}
// open new channel for SCP
public override SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command) {
return DoExecCommandInternal(receiver, ChannelType.ExecCommand, command, "executing " + command);
}
public override SSHChannel OpenShell(ISSHChannelEventReceiver receiver)
{
//open channel
SSH2DataWriter wr = new SSH2DataWriter();
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN);
wr.Write("session");
int local_channel = this.RegisterChannelEventReceiver(null, receiver)._localID;
wr.Write(local_channel);
wr.Write(_param.WindowSize); //initial window size
int windowsize = _param.WindowSize;
wr.Write(_param.MaxPacketSize); //max packet size
SSH2Channel channel = new SSH2Channel(this, ChannelType.Shell, local_channel);
TransmitPacket(wr.ToByteArray());
return channel;
}
// open subsystem such as NETCONF
public SSHChannel OpenSubsystem(ISSHChannelEventReceiver receiver, string subsystem) {
return DoExecCommandInternal(receiver, ChannelType.Subsystem, subsystem, "subsystem " + subsystem);
}
// sending exec command for SCP
// TODO: まだ実装中です
public override SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command)
{
//_executingExecCmd = true;
SendExecCommand();
return null;
}
//open channel
private SSHChannel DoExecCommandInternal(ISSHChannelEventReceiver receiver, ChannelType channel_type, string command, string message) {
SSH2DataWriter wr = OpenTransmissionPacket();
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN);
wr.Write("session");
int local_channel = this.ChannelCollection.RegisterChannelEventReceiver(null, receiver).LocalID;
wr.Write(local_channel);
wr.Write(_param.WindowSize); //initial window size
int windowsize = _param.WindowSize;
wr.Write(_param.MaxPacketSize); //max packet size
SSH2Channel channel = new SSH2Channel(this, channel_type, local_channel, command);
TraceTransmissionEvent(PacketType.SSH_MSG_CHANNEL_OPEN, "executing command");
TransmitPacket(wr);
return channel;
}
/** * forwards the remote end to another host */ public abstract SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port);
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port) {
SSH2DataWriter wr = OpenTransmissionPacket();
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN);
wr.Write("direct-tcpip");
int local_id = this.ChannelCollection.RegisterChannelEventReceiver(null, receiver).LocalID;
wr.Write(local_id);
wr.Write(_param.WindowSize); //initial window size
int windowsize = _param.WindowSize;
wr.Write(_param.MaxPacketSize); //max packet size
wr.Write(remote_host);
wr.Write(remote_port);
wr.Write(originator_host);
wr.Write(originator_port);
SSH2Channel channel = new SSH2Channel(this, ChannelType.ForwardedLocalToRemote, local_id, null);
TraceTransmissionEvent(PacketType.SSH_MSG_CHANNEL_OPEN, "opening a forwarded port : host={0} port={1}", remote_host, remote_port);
TransmitPacket(wr);
return channel;
}
public abstract SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command);
internal void ProcessPacket(ISSHChannelEventReceiver receiver, PacketType pt, int data_length, SSH2DataReader re) {
//NOTE: the offset of 're' is next to 'receipiant channel' field
AdjustWindowSize(pt, data_length);
//SSH_MSG_CHANNEL_WINDOW_ADJUST comes before the complete of channel establishment
if(pt==PacketType.SSH_MSG_CHANNEL_WINDOW_ADJUST) {
int w = re.ReadInt32();
//some servers may not send SSH_MSG_CHANNEL_WINDOW_ADJUST.
//it is dangerous to wait this message in send procedure
_allowedDataSize += w;
if(_connection.IsEventTracerAvailable)
_connection.TraceReceptionEvent("SSH_MSG_CHANNEL_WINDOW_ADJUST", "adjusted to {0} by increasing {1}", _allowedDataSize, w);
return;
}
if(_negotiationStatus!=NegotiationStatus.Ready) //when the negotiation is not completed
ProgressChannelNegotiation(receiver, pt, re);
else
ProcessChannelLocalData(receiver, pt, re);
}
/** * opens a pseudo terminal */ public abstract SSHChannel OpenShell(ISSHChannelEventReceiver receiver);
//Progress the state of this channel establishment negotiation
private void ProgressChannelNegotiation(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader re) {
if(_type==ChannelType.Shell)
OpenShellOrSubsystem(receiver, pt, re, "shell");
else if(_type==ChannelType.ForwardedLocalToRemote)
ReceivePortForwardingResponse(receiver, pt, re);
else if(_type==ChannelType.Session)
EstablishSession(receiver, pt, re);
else if(_type==ChannelType.ExecCommand) // for SCP
ExecCommand(receiver, pt, re);
else if(_type==ChannelType.Subsystem)
OpenShellOrSubsystem(receiver, pt, re, "subsystem");
}
public void EstablishPortforwarding(ISSHChannelEventReceiver rec, SSHChannel channel)
{
this._pf = channel;
}
private void ProcessChannelLocalData(ISSHChannelEventReceiver receiver, PacketType pt, SSH2DataReader re) {
switch(pt) {
case PacketType.SSH_MSG_CHANNEL_DATA: {
int len = re.ReadInt32();
receiver.OnData(re.Image, re.Offset, len);
}
break;
case PacketType.SSH_MSG_CHANNEL_EXTENDED_DATA: {
int t = re.ReadInt32();
byte[] data = re.ReadString();
receiver.OnExtendedData(t, data);
}
break;
case PacketType.SSH_MSG_CHANNEL_REQUEST: {
string request = Encoding.ASCII.GetString(re.ReadString());
bool reply = re.ReadBool();
if(request=="exit-status") {
int status = re.ReadInt32();
}
else if(reply) { //we reject unknown requests including keep-alive check
SSH2DataWriter wr = new SSH2DataWriter();
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_FAILURE);
wr.Write(_remoteID);
TransmitPayload(wr.ToByteArray());
}
}
break;
case PacketType.SSH_MSG_CHANNEL_EOF:
receiver.OnChannelEOF();
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE:
_connection.ChannelCollection.UnregisterChannelEventReceiver(_localID);
receiver.OnChannelClosed();
break;
case PacketType.SSH_MSG_CHANNEL_FAILURE:
receiver.OnMiscPacket((byte)pt, re.Image, re.Offset, re.Rest);
break;
default:
receiver.OnMiscPacket((byte)pt, re.Image, re.Offset, re.Rest);
Debug.WriteLine("Unknown Packet "+pt);
break;
}
}
public SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port)
{
throw new NotImplementedException();
}
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!
}
}
}
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);
}
// 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");
}
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port)
{
SSH2DataWriter wr = new SSH2DataWriter();
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN);
wr.Write("direct-tcpip");
int local_id = RegisterChannelEventReceiver(null, receiver)._localID;
wr.Write(local_id);
wr.Write(_param.WindowSize); //initial window size
int windowsize = _param.WindowSize;
wr.Write(_param.MaxPacketSize); //max packet size
wr.Write(remote_host);
wr.Write(remote_port);
wr.Write(originator_host);
wr.Write(originator_port);
SSH2Channel channel = new SSH2Channel(this, ChannelType.ForwardedLocalToRemote, local_id);
TransmitPacket(wr.ToByteArray());
return channel;
}
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");
}
public virtual void EstablishPortforwarding(ISSHChannelEventReceiver receiver, SSHChannel channel)
{
}
// sending exec command for SCP
// TODO: まだ実装中です
public override SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command)
{
//_executingExecCmd = true;
SendExecCommand();
return(null);
}
public override SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command)
{
throw new Exception("The method or operation is not implemented.");
}
internal void AsyncReceivePacket(DataFragment data)
{
try {
int len = 0, channel = 0;
SSH1DataReader re = new SSH1DataReader(data);
PacketType pt = re.ReadPacketType();
switch (pt)
{
case PacketType.SSH_SMSG_STDOUT_DATA:
len = re.ReadInt32();
_channel_collection.FindChannelEntry(_shellID).Receiver.OnData(re.Image, re.Offset, len);
break;
case PacketType.SSH_SMSG_STDERR_DATA: {
_channel_collection.FindChannelEntry(_shellID).Receiver.OnExtendedData((int)PacketType.SSH_SMSG_STDERR_DATA, re.ReadString());
}
break;
case PacketType.SSH_MSG_CHANNEL_DATA:
channel = re.ReadInt32();
len = re.ReadInt32();
_channel_collection.FindChannelEntry(channel).Receiver.OnData(re.Image, re.Offset, len);
break;
case PacketType.SSH_MSG_PORT_OPEN:
ProcessPortforwardingRequest(_eventReceiver, re);
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE: {
channel = re.ReadInt32();
ISSHChannelEventReceiver r = _channel_collection.FindChannelEntry(channel).Receiver;
_channel_collection.UnregisterChannelEventReceiver(channel);
r.OnChannelClosed();
}
break;
case PacketType.SSH_MSG_CHANNEL_CLOSE_CONFIRMATION:
channel = re.ReadInt32();
break;
case PacketType.SSH_MSG_DISCONNECT:
_eventReceiver.OnConnectionClosed();
break;
case PacketType.SSH_SMSG_EXITSTATUS:
_channel_collection.FindChannelEntry(_shellID).Receiver.OnChannelClosed();
break;
case PacketType.SSH_MSG_DEBUG:
_eventReceiver.OnDebugMessage(false, re.ReadString());
break;
case PacketType.SSH_MSG_IGNORE:
_eventReceiver.OnIgnoreMessage(re.ReadString());
break;
case PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION: {
int local = re.ReadInt32();
int remote = re.ReadInt32();
_channel_collection.FindChannelEntry(local).Receiver.OnChannelReady();
}
break;
case PacketType.SSH_SMSG_SUCCESS:
if (_executingShell)
{
ExecShell();
_channel_collection.FindChannelEntry(_shellID).Receiver.OnChannelReady();
_executingShell = false;
}
break;
default:
_eventReceiver.OnUnknownMessage((byte)pt, re.ReadAll());
break;
}
}
catch (Exception ex) {
_eventReceiver.OnError(ex);
}
}
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port)
{
if (_shellID == -1) {
ExecShell();
_shellID = _channel_collection.RegisterChannelEventReceiver(null, new SSH1DummyReceiver()).LocalID;
}
int local_id = _channel_collection.RegisterChannelEventReceiver(null, receiver).LocalID;
Transmit(
new SSH1Packet(SSH1PacketType.SSH_MSG_PORT_OPEN)
.WriteInt32(local_id) //channel id is fixed to 0
.WriteString(remote_host)
.WriteInt32(remote_port)
//originator is specified only if SSH_PROTOFLAG_HOST_IN_FWD_OPEN is specified
//writer.Write(originator_host);
);
TraceTransmissionEvent(SSH1PacketType.SSH_MSG_PORT_OPEN, "open forwarded port: host={0} port={1}", remote_host, remote_port);
return new SSH1Channel(this, ChannelType.ForwardedLocalToRemote, local_id);
}
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port)
{
throw new Exception("The method or operation is not implemented.");
}
/** * opens a pseudo terminal */ public abstract SSHChannel OpenShell(ISSHChannelEventReceiver receiver);
public SSHChannel StartShell(ISSHChannelEventReceiver receiver)
{
return(m_conn.OpenShell(receiver));
}
public override SSHChannel DoExecCommand(ISSHChannelEventReceiver receiver, string command)
{
throw new Exception("The method or operation is not implemented.");
}
public TelnetPacketBuilder(ISSHChannelEventReceiver handler)
{
this._handler = handler;
}
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port)
{
throw new Exception("The method or operation is not implemented.");
}
public override SSHChannel OpenShell(ISSHChannelEventReceiver receiver)
{
throw new Exception("The method or operation is not implemented.");
}
public void EstablishPortforwarding(ISSHChannelEventReceiver rec, SSHChannel channel)
{
_pf = channel;
}
public override SSHChannel OpenShell(ISSHChannelEventReceiver receiver)
{
throw new Exception("The method or operation is not implemented.");
}
