B4X

Disconnect All SSH Tunnel Clients

Demonstrates the Chilkat SshTunnel.DisconnectAllClients method, which disconnects all active tunnel clients while leaving the listener and SSH connection available. The only argument (waitForThreads) selects whether to wait for the client threads to exit.

Background: This is the complement of StopAccepting: it clears out current clients but keeps accepting new ones, so the listener and SSH transport stay up. It is useful for forcibly resetting stuck or unwanted connections without tearing down the whole tunnel — for example, dropping all sessions before a maintenance action while leaving the tunnel ready to serve fresh connections immediately afterward.

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Dim success As Boolean = False

'  Demonstrates the SshTunnel.DisconnectAllClients method, which disconnects all active tunnel
'  clients while leaving the listener and SSH connection available.  The only argument
'  (waitForThreads) selects whether to wait for the client threads to exit.

Dim tunnel As ChilkatSshTunnel
tunnel.Initialize("tunnel")

tunnel.DestHostname = "db.internal.example.com"
tunnel.DestPort = 5432

Dim sshPort As Int = 22
success = tunnel.Connect("ssh.example.com", sshPort)
If success = False Then
    Log(tunnel.LastErrorText)
    Return
End If


'  Normally you would not hard-code the password in source.  You should instead obtain it
'  from an interactive prompt, environment variable, or a secrets vault.
Dim password As String = "mySshPassword"

success = tunnel.AuthenticatePw("mySshLogin", password)
If success = False Then
    Log(tunnel.LastErrorText)
    Return
End If


Dim listenPort As Int = 1080
success = tunnel.BeginAccepting(listenPort)
If success = False Then
    Log(tunnel.LastErrorText)
    Return
End If


'  ... clients connect and transfer data ...

'  Disconnect all current clients.  The listener keeps running and will accept new clients.
Dim waitForThreads As Boolean = True
success = tunnel.DisconnectAllClients(waitForThreads)
If success = False Then
    Log(tunnel.LastErrorText)
    Return
End If

Log("All current clients disconnected; still accepting new ones.")

Dim waitForThreadExit As Boolean = True
success = tunnel.CloseTunnel(waitForThreadExit)
If success = False Then
    Log(tunnel.LastErrorText)
    Return
End If