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  remains
       unencrypted.  This allows NAT routers to follow the FTP transaction. Pass a long using one
       of the values below

       CURLFTPSSL_CCC_NONE
              do not 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

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           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, (long)CURLFTPSSL_CCC_ACTIVE);
           res = 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_FTPSSLAUTH(3), CURLOPT_PROTOCOLS_STR(3), CURLOPT_USE_SSL(3)