CURLOPT_FTP_SSL_CCC - Online Linux Manual PageSection : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options
NAMECURLOPT_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);
DESCRIPTIONIf 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.
DEFAULTCURLFTPSSL_CCC_NONE
PROTOCOLSFTP
EXAMPLECURL *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);
}
AVAILABILITYAdded in 7.16.1
RETURN VALUEReturns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
SEE ALSOCURLOPT_USE_SSL(3), CURLOPT_FTPSSLAUTH (3)," 0
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