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CURLOPT_FTP_SSL_CCC(3) Library Functions Manual CURLOPT_FTP_SSL_CCC(3) 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 fol- low 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 result; 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); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY CURLFTPSSL_* enums became long types in 8.16.0, prior to this version a long cast was necessary when passed to curl_easy_setopt(3). 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). SEE ALSO CURLOPT_FTPSSLAUTH(3), CURLOPT_PROTOCOLS_STR(3), CURLOPT_USE_SSL(3) libcurl 2026-06-11 CURLOPT_FTP_SSL_CCC(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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