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SSH Tunnel Thread Activity Log

Demonstrates the tunnel-log properties KeepTunnelLog, TunnelLog, and TunnelLogPath, which record the activity of the SSH tunnel and client-manager threads.

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

Background: This is the counterpart to the accept log, covering the SSH side rather than the listener: the tunnel and client-manager threads that actually move data. As with the accept log, KeepTunnelLog enables the in-memory TunnelLog while TunnelLogPath writes a separate file. Together the two logs let you localize a problem to either the accepting side or the forwarding side.

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llSuccess = .F.

//  Demonstrates the SshTunnel tunnel-log properties KeepTunnelLog, TunnelLog, and TunnelLogPath.
//  
//  These log the activity of the SSH tunnel and client-manager threads.

loTunnel = createobject("CkSshTunnel")

//  Retain the SSH tunnel-thread activity in memory so it can be read from the TunnelLog property.
loTunnel.KeepTunnelLog = .T.

//  Optionally also write the tunnel-thread activity to a file (separate from the in-memory log).
loTunnel.TunnelLogPath = "qa_output/tunnel.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

//  ... clients transfer data through the tunnel ...

//  Read the accumulated in-memory tunnel log.
? loTunnel.TunnelLog

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



release loTunnel