(.NET Core C#) Multi-Hop SSH (SSH Through SSH)

Demonstrates how to SSH through one SSH server to get to another SSH server. The scheme looks like this:

Application => ServerSSH1 => ServerSSH2

The ConnectThroughSsh method is added in Chilkat version 9.5.0.55 to accomplish this task. Technically, it should be possible to chain any number of servers using the ConnectThroughSsh multiple times:

Application => ServerSSH1 => ServerSSH2 ==> ServerSSH3 => ... => ServerSSHN

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// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Ssh ssh1 = new Chilkat.Ssh();

// Hostname may be an IP address or domain name:
string hostname = "192.168.1.108";
string port = 22;

// Connect directly to the 1st SSH server:
bool success = ssh1.Connect(hostname,port);
if (success != true) {
    Debug.WriteLine(ssh1.LastErrorText);
    return;
}

// Wait a max of 15 seconds when reading responses..
ssh1.IdleTimeoutMs = 15000;

// Authenticate using login/password:
success = ssh1.AuthenticatePw("myLogin","myPassword");
if (success != true) {
    Debug.WriteLine(ssh1.LastErrorText);
    return;
}

// Connect through the 1st SSH connection to reach a 2nd SSH server.
// Note: Any number of SSH connections may be simultaneously tunneled through a single
// existing SSH connection.
Chilkat.Ssh ssh2 = new Chilkat.Ssh();
success = ssh2.ConnectThroughSsh(ssh1,"someremoteserver.com",22);
if (success != true) {
    Debug.WriteLine(ssh2.LastErrorText);
    return;
}

ssh2.IdleTimeoutMs = 15000;

// Authenticate with ssh2...
success = ssh2.AuthenticatePw("myLogin2","myPassword2");
if (success != true) {
    Debug.WriteLine(ssh2.LastErrorText);
    return;
}

// The application may now is connected and authenticated with ssh2.
// The application can do whatever it desires just as if it was directly
// connected to ssh2.   For example, the application might open
// a session channel to send commands or start a remote shell..
int channelNum = ssh2.OpenSessionChannel();
if (channelNum < 0) {
    Debug.WriteLine(ssh2.LastErrorText);
    return;
}

// ...
// ...
// ...

// Close the connection with ssh2.  (This closes the the tunnel through ssh1.)
// The connection with ssh1 is still alive, and may be used for more connections.
ssh2.Disconnect();

// ...
// ...
// ...

ssh1.Disconnect();