(Xojo Plugin) 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

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim ssh1 As New Chilkat.Ssh

// Hostname may be an IP address or domain name:
Dim hostname As String
hostname = "192.168.1.108"
Dim port As String
port = 22

// Connect directly to the 1st SSH server:
Dim success As Boolean
success = ssh1.Connect(hostname,port)
If (success <> True) Then
    System.DebugLog(ssh1.LastErrorText)
    Return
End If

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

// Authenticate using login/password:
success = ssh1.AuthenticatePw("myLogin","myPassword")
If (success <> True) Then
    System.DebugLog(ssh1.LastErrorText)
    Return
End If

// 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.
Dim ssh2 As New Chilkat.Ssh
success = ssh2.ConnectThroughSsh(ssh1,"someremoteserver.com",22)
If (success <> True) Then
    System.DebugLog(ssh2.LastErrorText)
    Return
End If

ssh2.IdleTimeoutMs = 15000

// Authenticate with ssh2...
success = ssh2.AuthenticatePw("myLogin2","myPassword2")
If (success <> True) Then
    System.DebugLog(ssh2.LastErrorText)
    Return
End If

// 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..
Dim channelNum As Int32
channelNum = ssh2.OpenSessionChannel()
If (channelNum < 0) Then
    System.DebugLog(ssh2.LastErrorText)
    Return
End If

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

// 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