Man page - curlopt_use_ssl(3)

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Package: libcurl4-doc
apt-get install libcurl4-doc

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CURLOPT_USE_SSL - request using SSL / TLS for the transfer

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USE_SSL, long level);

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 does not succeed.

CURLUSESSL_CONTROL

Require SSL for the control connection or fail with CURLE_USE_SSL_FAILED .

CURLUSESSL_ALL

Require SSL for all communication or fail with CURLE_USE_SSL_FAILED .

CURLUSESSL_NONE

This functionality affects ftp, imap, pop3 and smtp

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
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, (long)CURLUSESSL_ALL);

/* Perform the request */
curl_easy_perform(curl);
}
}

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.

Added in curl 7.17.0

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) .