NAME

       CURLOPT_FTP_SSL_CCC - switch off SSL again with FTP after auth

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SSL_CCC,
                                 long how);

DESCRIPTION

       If  enabled,  this  option makes libcurl use CCC (Clear Command Channel). It shuts down the SSL/TLS layer
       after authenticating. The rest of the control channel communication will be unencrypted. This allows  NAT
       routers to follow the FTP transaction. Pass a long using one of the values below

       CURLFTPSSL_CCC_NONE
              Don't attempt to use CCC.

       CURLFTPSSL_CCC_PASSIVE
              Do not initiate the shutdown, but wait for the server to do it. Do not send a reply.

       CURLFTPSSL_CCC_ACTIVE
              Initiate the shutdown and wait for a reply.

DEFAULT

       CURLFTPSSL_CCC_NONE

PROTOCOLS

       FTP

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
         curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_CONTROL);
         /* go back to clear-text FTP after authenticating */
         curl_easy_setopt(curl, CURLOPT_FTP_SSL_CCC, CURLFTPSSL_CCC_ACTIVE);
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.16.1

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_USE_SSL(3), CURLOPT_FTPSSLAUTH(3),