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        !            23: .TH CURLOPT_FTP_SSL_CCC 3 "May 31, 2017" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_FTP_SSL_CCC \- switch off SSL again with FTP after auth
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SSL_CCC,
        !            31:                           long how);
        !            32: .SH DESCRIPTION
        !            33: If enabled, this option makes libcurl use CCC (Clear Command Channel). It
        !            34: shuts down the SSL/TLS layer after authenticating. The rest of the control
        !            35: channel communication will be unencrypted. This allows NAT routers to follow
        !            36: the FTP transaction. Pass a long using one of the values below
        !            37: .IP CURLFTPSSL_CCC_NONE
        !            38: Don't attempt to use CCC.
        !            39: .IP CURLFTPSSL_CCC_PASSIVE
        !            40: Do not initiate the shutdown, but wait for the server to do it. Do not send a
        !            41: reply.
        !            42: .IP CURLFTPSSL_CCC_ACTIVE
        !            43: Initiate the shutdown and wait for a reply.
        !            44: .SH DEFAULT
        !            45: CURLFTPSSL_CCC_NONE
        !            46: .SH PROTOCOLS
        !            47: FTP
        !            48: .SH EXAMPLE
        !            49: .nf
        !            50: CURL *curl = curl_easy_init();
        !            51: if(curl) {
        !            52:   curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
        !            53:   curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_CONTROL);
        !            54:   /* go back to clear-text FTP after authenticating */
        !            55:   curl_easy_setopt(curl, CURLOPT_FTP_SSL_CCC, CURLFTPSSL_CCC_ACTIVE);
        !            56:   ret = curl_easy_perform(curl);
        !            57:   curl_easy_cleanup(curl);
        !            58: }
        !            59: .fi
        !            60: .SH AVAILABILITY
        !            61: Added in 7.16.1
        !            62: .SH RETURN VALUE
        !            63: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            64: .SH "SEE ALSO"
        !            65: .BR CURLOPT_USE_SSL "(3), " CURLOPT_FTPSSLAUTH "(3), "