docs/libcurl/opts/CURLOPT_FTP_SSL_CCC.3

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.TH CURLOPT_FTP_SSL_CCC 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_FTP_SSL_CCC \- switch off SSL again with FTP after auth
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SSL_CCC,
                          long how);
.SH 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
.IP CURLFTPSSL_CCC_NONE
Don't attempt to use CCC.
.IP CURLFTPSSL_CCC_PASSIVE
Do not initiate the shutdown, but wait for the server to do it. Do not send a
reply.
.IP CURLFTPSSL_CCC_ACTIVE
Initiate the shutdown and wait for a reply.
.SH DEFAULT
CURLFTPSSL_CCC_NONE
.SH PROTOCOLS
FTP
.SH EXAMPLE
.nf
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);
}
.fi
.SH AVAILABILITY
Added in 7.16.1
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_USE_SSL "(3), " CURLOPT_FTPSSLAUTH "(3), "