CURLOPT_FTP_SSL_CCC(3)

CURLOPT_FTP_SSL_CCC(3curl_easy_setopt optionCURLOPT_FTP_SSL_CCC(3)

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 authenticat-
     ing. The rest of the control channel communication  will  be
     unencrypted. This allows NAT routers to follow the FTP tran-
     saction. 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.

libcurl 7.58.0      Last change: May 31, 2017                   1

CURLOPT_FTP_SSL_CCC(3curl_easy_setopt optionCURLOPT_FTP_SSL_CCC(3)

SEE ALSO

     CURLOPT_USE_SSL(3), CURLOPT_FTPSSLAUTH(3),

libcurl 7.58.0      Last change: May 31, 2017                   2