Tribblix: manual page: CURLOPT_FTP_SSL

CURLOPT_FTP_SSL_CCC(3) Introduction to Library Functions

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

This functionality affects ftp only

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 curl 7.16.1

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).