private void ProcessAgentForwardRequest(ISSHConnectionEventReceiver receiver, SSH2DataReader reader) {
int remote_channel = reader.ReadInt32();
int window_size = reader.ReadInt32(); //skip initial window size
int servermaxpacketsize = reader.ReadInt32();
TraceReceptionEvent("agent forward request", "");
SSH2DataWriter wr = new SSH2DataWriter();
IAgentForward af = _param.AgentForward;
if (_agentForwardConfirmed && af != null && af.CanAcceptForwarding()) {
//send OPEN_CONFIRMATION
AgentForwardingChannel ch = new AgentForwardingChannel(af);
SSH2Channel channel = new SSH2Channel(this, ChannelType.AgentForward, this.ChannelCollection.RegisterChannelEventReceiver(null, ch).LocalID, remote_channel, servermaxpacketsize);
ch.SetChannel(channel);
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
wr.WriteInt32(remote_channel);
wr.WriteInt32(channel.LocalChannelID);
wr.WriteInt32(_param.WindowSize); //initial window size
wr.WriteInt32(_param.MaxPacketSize); //max packet size
TraceTransmissionEvent("granados confirmed agent-forwarding request", "");
}
else {
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE);
wr.WriteInt32(remote_channel);
wr.WriteInt32(0);
wr.WriteString("reject");
wr.WriteString(""); //lang tag
TraceTransmissionEvent("granados rejected agent-forwarding request", "");
}
TransmitRawPayload(wr.ToByteArray());
}
public override SSHChannel ForwardPort(ISSHChannelEventReceiver receiver, string remote_host, int remote_port, string originator_host, int originator_port) {
SSH2TransmissionPacket packet = OpenPacket();
SSH2DataWriter wr = packet.DataWriter;
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN);
wr.WriteString("direct-tcpip");
int local_id = this.ChannelCollection.RegisterChannelEventReceiver(null, receiver).LocalID;
wr.WriteInt32(local_id);
wr.WriteInt32(_param.WindowSize); //initial window size
int windowsize = _param.WindowSize;
wr.WriteInt32(_param.MaxPacketSize); //max packet size
wr.WriteString(remote_host);
wr.WriteInt32(remote_port);
wr.WriteString(originator_host);
wr.WriteInt32(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(packet);
return channel;
}
private void ProcessPortforwardingRequest(ISSHConnectionEventReceiver receiver, SSH2DataReader reader) {
int remote_channel = reader.ReadInt32();
int window_size = reader.ReadInt32(); //skip initial window size
int servermaxpacketsize = reader.ReadInt32();
string host = Encoding.ASCII.GetString(reader.ReadString());
int port = reader.ReadInt32();
string originator_ip = Encoding.ASCII.GetString(reader.ReadString());
int originator_port = reader.ReadInt32();
TraceReceptionEvent("port forwarding request", String.Format("host={0} port={1} originator-ip={2} originator-port={3}", host, port, originator_ip, originator_port));
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, this.ChannelCollection.RegisterChannelEventReceiver(null, r.channel).LocalID, remote_channel, servermaxpacketsize);
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
wr.WriteInt32(remote_channel);
wr.WriteInt32(channel.LocalChannelID);
wr.WriteInt32(_param.WindowSize); //initial window size
wr.WriteInt32(_param.MaxPacketSize); //max packet size
receiver.EstablishPortforwarding(r.channel, channel);
TraceTransmissionEvent("port-forwarding request is confirmed", "host={0} port={1} originator-ip={2} originator-port={3}", host, port, originator_ip, originator_port);
}
else {
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN_FAILURE);
wr.WriteInt32(remote_channel);
wr.WriteInt32(r.reason_code);
wr.WriteString(r.reason_message);
wr.WriteString(""); //lang tag
TraceTransmissionEvent("port-forwarding request is rejected", "host={0} port={1} originator-ip={2} originator-port={3}", host, port, originator_ip, originator_port);
}
TransmitRawPayload(wr.ToByteArray());
}
//open channel
private SSHChannel DoExecCommandInternal(ISSHChannelEventReceiver receiver, ChannelType channel_type, string command, string message) {
SSH2TransmissionPacket packet = OpenPacket();
SSH2DataWriter wr = packet.DataWriter;
wr.WritePacketType(PacketType.SSH_MSG_CHANNEL_OPEN);
wr.WriteString("session");
int local_channel = this.ChannelCollection.RegisterChannelEventReceiver(null, receiver).LocalID;
wr.WriteInt32(local_channel);
wr.WriteInt32(_param.WindowSize); //initial window size
int windowsize = _param.WindowSize;
wr.WriteInt32(_param.MaxPacketSize); //max packet size
SSH2Channel channel = new SSH2Channel(this, channel_type, local_channel, command);
TraceTransmissionEvent(PacketType.SSH_MSG_CHANNEL_OPEN, message);
TransmitPacket(packet);
return channel;
}