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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_FTP_SSL_CCC
Section: 3
Source: libcurl
Protocol:
- FTP
See-also:
- CURLOPT_FTPSSLAUTH (3)
- CURLOPT_PROTOCOLS_STR (3)
- CURLOPT_USE_SSL (3)
Added-in: 7.16.1
---
# NAME
CURLOPT_FTP_SSL_CCC - switch off SSL again with FTP after auth
# SYNOPSIS
~~~c
#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%
# EXAMPLE
~~~c
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode result;
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);
result = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
~~~
# HISTORY
**CURLFTPSSL_*** enums became `long` types in 8.16.0, prior to this version
a `long` cast was necessary when passed to curl_easy_setopt(3).
# %AVAILABILITY%
# RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
libcurl-errors(3).
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