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SSH Tunnel Listener Activity Log

Demonstrates the listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath, which record the activity of the background listener thread started by BeginAccepting.

Note: The log paths are relative to the application's current working directory. Absolute paths may also be used.

Background: Because the listener runs on a background thread, an activity log is often the only practical way to see what it is doing — which connections it accepted and when. KeepAcceptLog must be enabled for the in-memory AcceptLog to be populated; AcceptLogPath is an independent file-based log that persists across the run. This log covers the listener specifically, as distinct from the TunnelLog that records the SSH tunnel threads.

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llSuccess = .F.

//  Demonstrates the SshTunnel listener-log properties KeepAcceptLog, AcceptLog, and AcceptLogPath.
//  
//  These log the activity of the background listener thread started by BeginAccepting.

loTunnel = createobject("CkSshTunnel")

//  Retain the listener activity log in memory so it can be read from the AcceptLog property.
loTunnel.KeepAcceptLog = .T.

//  Optionally also write the listener activity to a file (separate from the in-memory log).
loTunnel.AcceptLogPath = "qa_output/accept.log"

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

lnSshPort = 22
llSuccess = loTunnel.Connect("ssh.example.com",lnSshPort)
if (llSuccess = .F.) then
    ? loTunnel.LastErrorText
    release loTunnel
    return
endif

//  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.
lcPassword = "mySshPassword"

llSuccess = loTunnel.AuthenticatePw("mySshLogin",lcPassword)
if (llSuccess = .F.) then
    ? loTunnel.LastErrorText
    release loTunnel
    return
endif

lnListenPort = 1080
llSuccess = loTunnel.BeginAccepting(lnListenPort)
if (llSuccess = .F.) then
    ? loTunnel.LastErrorText
    release loTunnel
    return
endif

//  ... the listener accepts connections for a while ...

//  Read the accumulated in-memory listener log.
? loTunnel.AcceptLog

llWaitForThreadExit = .T.
llSuccess = loTunnel.CloseTunnel(llWaitForThreadExit)
if (llSuccess = .F.) then
    ? loTunnel.LastErrorText
    release loTunnel
    return
endif



release loTunnel