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CURLOPT_USE_SSL(3) Library Functions Manual CURLOPT_USE_SSL(3) NAME CURLOPT_USE_SSL - request using SSL / TLS for the transfer SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USE_SSL, long level); DESCRIPTION Pass a long using one of the values from below, to make libcurl use your desired level of SSL for the transfer. These are all protocols that start out plain text and get "upgraded" to SSL using the STARTTLS command. This is for enabling SSL/TLS when you use FTP, SMTP, POP3, IMAP etc. CURLUSESSL_NONE Do not attempt to use SSL. CURLUSESSL_TRY Try using SSL, proceed as normal otherwise. Note that server may close the connection if the negotiation fails. This level is inse- cure and should be avoided since it allows the connection to remain unprotected. CURLUSESSL_CONTROL Require SSL for the control connection or fail with CURLE_USE_SSL_FAILED. This level is partially insecure and should be avoided since it lets the data connection remain unprotected. This level is meant for FTP, since that is the only protocol with separate connections for control and data. If used for IMAP, POP3 or SMTP it equals CURLUSESSL_ALL. CURLUSESSL_ALL Require SSL for all communication or fail with CURLE_USE_SSL_FAILED. DEFAULT CURLUSESSL_NONE PROTOCOLS This functionality affects ftp, imap, pop3 and smtp EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/file.ext"); /* require use of SSL for this, or fail */ curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL); /* Perform the request */ result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY This option was known as CURLOPT_FTP_SSL up to 7.16.4. Supported by LDAP since 7.81.0. Fully supported by the OpenLDAP backend only. CURLUSESSL_* enums became long types in 8.13.0, prior to this version a long cast was necessary when passed to curl_easy_setopt(3). AVAILABILITY Added in curl 7.17.0 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_PROXY_SSLVERSION(3), CURLOPT_SSLVERSION(3), CURLOPT_SSL_OPTIONS(3) libcurl 2026-06-11 CURLOPT_USE_SSL(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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