(C) FTP Connect, Examine Server Certificate, and then Authenticate

Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate.

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#include <C_CkFtp2.h>
#include <C_CkCert.h>

void ChilkatSample(void)
    {
    HCkFtp2 ftp;
    BOOL success;
    HCkCert serverCert;

    // This example assumes Chilkat Ftp2 to have been previously unlocked.
    // See Unlock Ftp2 for sample code.

    ftp = CkFtp2_Create();

    CkFtp2_putHostname(ftp,"www.authtls-ftps-server.com");
    CkFtp2_putUsername(ftp,"FTP_LOGIN");
    CkFtp2_putPassword(ftp,"FTP_PASSWORD");
    CkFtp2_putAuthTls(ftp,TRUE);
    CkFtp2_putPort(ftp,21);

    // Connect to the FTP server using explicit TLS (AUTH TLS).
    success = CkFtp2_ConnectOnly(ftp);
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        return;
    }

    // Get the FTP server's certificate.
    serverCert = CkFtp2_GetSslServerCert(ftp);
    if (CkFtp2_getLastMethodSuccess(ftp) != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        return;
    }

    // Now that we have the certificate, we can check it in any way we desire.
    // (See the online reference documentation for the certificate object's methods
    // and properties)...

    // Assuming the certificate is OK, proceed to authenticate with the FTP server.
    success = CkFtp2_LoginAfterConnectOnly(ftp);
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        return;
    }

    // 
    // Proceed with uploading/download files, etc...
    // 

    CkFtp2_Disconnect(ftp);
    printf("Success.\n");


    CkFtp2_Dispose(ftp);

    }