PureBasic

Open an SSH Tunnel

Demonstrates Socket.SshOpenTunnel, which connects to an SSH server and initializes an SSH tunneling session, then authenticates it.

Background. An SSH tunnel lets a socket reach a destination host through an SSH server using port forwarding. The sequence is: open the tunnel, authenticate, then open forwarded channels to destinations.

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PureBasic

IncludeFile "CkSocket.pb"

Procedure ChilkatExample()

    success.i = 0

    socket.i = CkSocket::ckCreate()
    If socket.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ;  Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
    ;  not required.
    success = CkSocket::ckSshOpenTunnel(socket,"ssh.example.com",22)
    If success = 0
        Debug CkSocket::ckLastErrorText(socket)
        CkSocket::ckDispose(socket)
        ProcedureReturn
    EndIf

    ;  After the tunnel is open, authenticate before opening forwarded channels.
    ;  The SSH password should come from a secure source rather than being hard-coded.
    sshPassword.s = "mySshPassword"
    success = CkSocket::ckSshAuthenticatePw(socket,"sshUser",sshPassword)
    If success = 0
        Debug CkSocket::ckLastErrorText(socket)
        CkSocket::ckDispose(socket)
        ProcedureReturn
    EndIf

    Debug "SSH tunnel established and authenticated."


    CkSocket::ckDispose(socket)


    ProcedureReturn
EndProcedure