CURLOPT_FTP_SSL_CCC − switch off SSL again with FTP after auth
#include <curl/curl.h>
CURLcode
curl_easy_setopt(CURL *handle, CURLOPT_FTP_SSL_CCC,
long how);
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.
CURLFTPSSL_CCC_NONE
FTP
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);
}
}
Added in 7.16.1
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
CURLOPT_FTPSSLAUTH(3), CURLOPT_PROTOCOLS_STR(3), CURLOPT_USE_SSL(3)