(C) Socket Convert Existing TCP Connection to SSL/TLS

Demonstrates the Chilkat Socket ConvertToSsl method.

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#include <C_CkSocket.h>

void ChilkatSample(void)
    {
    HCkSocket sock;
    BOOL useTls;
    int port;
    int maxWaitMs;
    BOOL success;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    sock = CkSocket_Create();

    // --------------------------------------------------------------------
    // This example uses the public TCP/TLS echo service at https://tcpbin.com/
    // --------------------------------------------------------------------

    // The echo server at tcpbin.com expects to receive TCP connections on port 4242, and TLS connections on port 4243.
    // We could simply connect to port 4243 using TLS like this.
    // However, further below, this example shows how to initially make a TCP connection, and then convert the connection to TLS.
    useTls = TRUE;
    port = 4243;
    maxWaitMs = 5000;
    success = CkSocket_Connect(sock,"tcpbin.com",port,useTls,maxWaitMs);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(sock));
        CkSocket_Dispose(sock);
        return;
    }

    // OK, we have a TLS connection.
    // Note: The server chooses the TLS protocol version. 
    // We can see the version of the TLS connection that was established:
    printf("TLS version: %s\n",CkSocket_tlsVersion(sock));

    CkSocket_Close(sock,maxWaitMs);

    // ---------------------------------------------------------------------
    // Now we'll do the same, except first we connect to port 4243 using TCP,
    // and then convert the connection to TLS.
    // 
    // This may seem pointless, and it is for the case w/ this server.  However, there could be situations
    // where you're interacting with a server of some kind where there is a need to convert to/from TLS.
    // (This is common internal to many protocols, such as SMTP, IMAP, FTP, etc., and it is often called "explicit" SSL/TLS)

    // Connect again, except this time useTls is FALSE, so we only have a simple TCP connection after this call.
    useTls = FALSE;
    success = CkSocket_Connect(sock,"tcpbin.com",port,useTls,maxWaitMs);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(sock));
        CkSocket_Dispose(sock);
        return;
    }

    // Convert the existing TCP connection to TLS.
    // (The method name uses "SSL" because long ago, at the time of initial development, TLS 1.0 did not yet exist.)
    success = CkSocket_ConvertToSsl(sock);
    if (success == FALSE) {
        printf("%s\n",CkSocket_lastErrorText(sock));
        CkSocket_Dispose(sock);
        return;
    }

    // OK, we now have a TLS connection.
    // Again, we can see the TLS version:
    printf("TLS version: %s\n",CkSocket_tlsVersion(sock));

    CkSocket_Close(sock,maxWaitMs);


    CkSocket_Dispose(sock);

    }