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Unicode C Examples

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(Unicode C) SSH Tunnel with Dynamic Port Forwarding

Demonstrates how to start a background thread that runs a portable SSH tunnel w/ dynamic port forwarding that the foreground thread can use for establishing connections through an SSH tunnel.

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#include <C_CkGlobalW.h>
#include <C_CkSshTunnelW.h>
#include <C_CkHttpW.h>

void ChilkatSample(void)
    {
    HCkGlobalW chilkatGlob;
    BOOL success;
    HCkSshTunnelW tunnel;
    const wchar_t *sshHostname;
    int sshPort;
    const wchar_t *url;
    HCkHttpW http;
    const wchar_t *html;
    BOOL waitForThreadExit;

    //  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.
    chilkatGlob = CkGlobalW_Create();
    success = CkGlobalW_UnlockBundle(chilkatGlob,L"Anything for 30-day trial.");
    if (success != TRUE) {
        wprintf(L"%s\n",CkGlobalW_lastErrorText(chilkatGlob));
        CkGlobalW_Dispose(chilkatGlob);
        return;
    }

    //  This example requires Chilkat version 9.5.0.50 or greater.
    tunnel = CkSshTunnelW_Create();

    sshHostname = L"www.my-ssh-server.com";
    sshPort = 22;

    //  Connect to an SSH server and establish the SSH tunnel:
    success = CkSshTunnelW_Connect(tunnel,sshHostname,sshPort);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkGlobalW_Dispose(chilkatGlob);
        CkSshTunnelW_Dispose(tunnel);
        return;
    }

    //  Authenticate with the SSH server via a login/password
    //  or with a public key.
    //  This example demonstrates SSH password authentication.
    success = CkSshTunnelW_AuthenticatePw(tunnel,L"mySshLogin",L"mySshPassword");
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkGlobalW_Dispose(chilkatGlob);
        CkSshTunnelW_Dispose(tunnel);
        return;
    }

    //  Indicate that the background SSH tunnel thread will behave as a SOCKS proxy server
    //  with dynamic port forwarding:
    CkSshTunnelW_putDynamicPortForwarding(tunnel,TRUE);

    //  We may optionally require that connecting clients authenticate with our SOCKS proxy server.
    //  To do this, set an inbound username/password.  Any connecting clients would be required to
    //  use SOCKS5 with the correct username/password.
    //  If no inbound username/password is set, then our SOCKS proxy server will accept both
    //  SOCKS4 and SOCKS5 unauthenticated connections.

    CkSshTunnelW_putInboundSocksUsername(tunnel,L"chilkat123");
    CkSshTunnelW_putInboundSocksPassword(tunnel,L"password123");

    //  Start the listen/accept thread to begin accepting SOCKS proxy client connections.
    //  Listen on port 1080.
    success = CkSshTunnelW_BeginAccepting(tunnel,1080);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkGlobalW_Dispose(chilkatGlob);
        CkSshTunnelW_Dispose(tunnel);
        return;
    }

    //  Now that a background thread is running a SOCKS proxy server that forwards connections
    //  through an SSH tunnel, it is possible to use any Chilkat implemented protocol that is SOCKS capable,
    //  such as HTTP, POP3, SMTP, IMAP, FTP, etc.  The protocol may use SSL/TLS because the SSL/TLS
    //  will be passed through the SSH tunnel to the end-destination.  Also, any number of simultaneous
    //  connections may be routed through the SSH tunnel.

    //  For this example, let's do a simple HTTPS request:
    url = L"https://www.ethereum.org/";

    http = CkHttpW_Create();

    //  Indicate that the HTTP object is to use our portable SOCKS proxy/SSH tunnel running in our background thread.
    CkHttpW_putSocksHostname(http,L"localhost");
    CkHttpW_putSocksPort(http,1080);
    CkHttpW_putSocksVersion(http,5);
    CkHttpW_putSocksUsername(http,L"chilkat123");
    CkHttpW_putSocksPassword(http,L"password123");

    CkHttpW_putSendCookies(http,TRUE);
    CkHttpW_putSaveCookies(http,TRUE);
    CkHttpW_putCookieDir(http,L"memory");

    //  Do the HTTPS page fetch (through the SSH tunnel)
    html = CkHttpW_quickGetStr(http,url);
    if (CkHttpW_getLastMethodSuccess(http) != TRUE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkGlobalW_Dispose(chilkatGlob);
        CkSshTunnelW_Dispose(tunnel);
        CkHttpW_Dispose(http);
        return;
    }

    //  Stop the background listen/accept thread:
    waitForThreadExit = TRUE;
    success = CkSshTunnelW_StopAccepting(tunnel,waitForThreadExit);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkGlobalW_Dispose(chilkatGlob);
        CkSshTunnelW_Dispose(tunnel);
        CkHttpW_Dispose(http);
        return;
    }

    //  Close the SSH tunnel (would also kick any remaining connected clients).
    success = CkSshTunnelW_CloseTunnel(tunnel,waitForThreadExit);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSshTunnelW_lastErrorText(tunnel));
        CkGlobalW_Dispose(chilkatGlob);
        CkSshTunnelW_Dispose(tunnel);
        CkHttpW_Dispose(http);
        return;
    }



    CkGlobalW_Dispose(chilkatGlob);
    CkSshTunnelW_Dispose(tunnel);
    CkHttpW_Dispose(http);

    }

 

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