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23 .TH CURLOPT_FTP_SSL_CCC 3 "May 31, 2017" "libcurl 7.59.0" "curl_easy_setopt options"
26 CURLOPT_FTP_SSL_CCC \- switch off SSL again with FTP after auth
28 #include <curl/curl.h>
30 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SSL_CCC,
33 If enabled, this option makes libcurl use CCC (Clear Command Channel). It
34 shuts down the SSL/TLS layer after authenticating. The rest of the control
35 channel communication will be unencrypted. This allows NAT routers to follow
36 the FTP transaction. Pass a long using one of the values below
37 .IP CURLFTPSSL_CCC_NONE
38 Don't attempt to use CCC.
39 .IP CURLFTPSSL_CCC_PASSIVE
40 Do not initiate the shutdown, but wait for the server to do it. Do not send a
42 .IP CURLFTPSSL_CCC_ACTIVE
43 Initiate the shutdown and wait for a reply.
50 CURL *curl = curl_easy_init();
52 curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
53 curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_CONTROL);
54 /* go back to clear-text FTP after authenticating */
55 curl_easy_setopt(curl, CURLOPT_FTP_SSL_CCC, CURLFTPSSL_CCC_ACTIVE);
56 ret = curl_easy_perform(curl);
57 curl_easy_cleanup(curl);
63 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
65 .BR CURLOPT_USE_SSL "(3), " CURLOPT_FTPSSLAUTH "(3), "