CURLOPT_FTP_SSL_CCC - Man Page
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 will be 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
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, (long)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.
See Also
Referenced By
curl_easy_setopt(3), CURLOPT_FTPSSLAUTH(3).
April 26, 2023 ibcurl 8.1.1 libcurl