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(C++) SSH Tunnel for Database Connection (such as ADO, ODBC, etc.)

Demonstrates how to create an SSH tunneling client in a background thread of your application. This makes it possible to SSH tunnel database connections without the need for separate software (such as PuTTY) to be running.

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#include <CkGlobal.h>
#include <CkSshTunnel.h>

void ChilkatSample(void)
    {
    //  Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    //  by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob;
    bool success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        std::cout << chilkatGlob.lastErrorText() << "\r\n";
        return;
    }

    //  This example requires Chilkat version 9.5.0.50 or greater.
    CkSshTunnel tunnel;

    const char *sshHostname = "www.my-ssh-server.com";
    int sshPort = 22;

    //  Connect to an SSH server and establish the SSH tunnel:
    success = tunnel.Connect(sshHostname,sshPort);
    if (success != true) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }

    //  Authenticate with the SSH server via a login/password
    //  or with a public key.
    //  This example demonstrates SSH password authentication.
    success = tunnel.AuthenticatePw("mySshLogin","mySshPassword");
    if (success != true) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }

    //  The destination host/port is the database server.
    //  The DestHostname may be the domain name or
    //  IP address (in dotted decimal notation) of the database
    //  server.
    tunnel.put_DestPort(1433);
    tunnel.put_DestHostname("myDbServer.com");

    //  Start accepting connections in a background thread.
    //  The SSH tunnels are autonomously run in a background
    //  thread.  There is one background thread for accepting
    //  connections, and another for managing the tunnel pool.
    int listenPort = 3316;
    success = tunnel.BeginAccepting(listenPort);
    if (success != true) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }

    //  At this point the app may connect to the database server through
    //  the SSH tunnel.  The database connection string would
    //  use "localhost" for the hostname and 3316 for the port.
    //  We're not going to show the database coding here,
    //  because it can vary depending on the API you're using
    //  (ADO, ODBC, OLE DB, etc. )

    //  This is where the application's database code would go...

    //  Stop the background listen/accept thread:
    bool waitForThreadExit = true;
    success = tunnel.StopAccepting(waitForThreadExit);
    if (success != true) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }

    //  Close the SSH tunnel (would also kick any remaining connected clients).
    success = tunnel.CloseTunnel(waitForThreadExit);
    if (success != true) {
        std::cout << tunnel.lastErrorText() << "\r\n";
        return;
    }


    }

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