public 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;
}
private void ProcessPortforwardingRequest(ISSHConnectionEventReceiver receiver, SSH2DataReader reader)
{
byte[] tmpdata = reader.ReadString();
string method = Encoding.UTF8.GetString(tmpdata, 0, tmpdata.Length);
int remote_channel = reader.ReadInt32();
int window_size = reader.ReadInt32(); //skip initial window size
int servermaxpacketsize = reader.ReadInt32();
tmpdata = reader.ReadString();
string host = Encoding.UTF8.GetString(tmpdata, 0, tmpdata.Length);
int port = reader.ReadInt32();
tmpdata = reader.ReadString();
string originator_ip = Encoding.UTF8.GetString(tmpdata, 0, tmpdata.Length);
int originator_port = reader.ReadInt32();
PortForwardingCheckResult r = receiver.CheckPortForwardingRequest(host,port,originator_ip,originator_port);
SSH2DataWriter wr = new SSH2DataWriter();
if(r.allowed) {
//send OPEN_CONFIRMATION
SSH2Channel channel = new SSH2Channel(this, ChannelType.ForwardedRemoteToLocal, RegisterChannelEventReceiver(null, r.channel)._localID, remote_channel, servermaxpacketsize);
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
wr.Write(remote_channel);
wr.Write(channel.LocalChannelID());
wr.Write(_param.WindowSize); //initial window size
wr.Write(_param.MaxPacketSize); //max packet size
receiver.EstablishPortforwarding(r.channel, channel);
}
else {
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE);
wr.Write(remote_channel);
wr.Write(r.reason_code);
wr.Write(r.reason_message);
wr.Write(""); //lang tag
}
TransmitPacket(wr.ToByteArray());
}
public 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;
}