SSH Tunnel Thread Activity Log

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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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#include <C_CkSshTunnel.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkSshTunnel tunnel;
    int sshPort;
    const char *password;
    int listenPort;
    BOOL waitForThreadExit;

    success = FALSE;

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

    tunnel = CkSshTunnel_Create();

    //  Retain the SSH tunnel-thread activity in memory so it can be read from the TunnelLog property.
    CkSshTunnel_putKeepTunnelLog(tunnel,TRUE);

    //  Optionally also write the tunnel-thread activity to a file (separate from the in-memory log).
    CkSshTunnel_putTunnelLogPath(tunnel,"qa_output/tunnel.log");

    CkSshTunnel_putDestHostname(tunnel,"db.internal.example.com");
    CkSshTunnel_putDestPort(tunnel,5432);

    sshPort = 22;
    success = CkSshTunnel_Connect(tunnel,"ssh.example.com",sshPort);
    if (success == FALSE) {
        printf("%s\n",CkSshTunnel_lastErrorText(tunnel));
        CkSshTunnel_Dispose(tunnel);
        return;
    }

    //  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.
    password = "mySshPassword";

    success = CkSshTunnel_AuthenticatePw(tunnel,"mySshLogin",password);
    if (success == FALSE) {
        printf("%s\n",CkSshTunnel_lastErrorText(tunnel));
        CkSshTunnel_Dispose(tunnel);
        return;
    }

    listenPort = 1080;
    success = CkSshTunnel_BeginAccepting(tunnel,listenPort);
    if (success == FALSE) {
        printf("%s\n",CkSshTunnel_lastErrorText(tunnel));
        CkSshTunnel_Dispose(tunnel);
        return;
    }

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

    //  Read the accumulated in-memory tunnel log.
    printf("%s\n",CkSshTunnel_tunnelLog(tunnel));

    waitForThreadExit = TRUE;
    success = CkSshTunnel_CloseTunnel(tunnel,waitForThreadExit);
    if (success == FALSE) {
        printf("%s\n",CkSshTunnel_lastErrorText(tunnel));
        CkSshTunnel_Dispose(tunnel);
        return;
    }



    CkSshTunnel_Dispose(tunnel);

    }