CURLOPT_USE_SSL3

Usage

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USE_SSL, long level);

Overview

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.

Default

CURLUSESSL_NONE

Protocols

FTP, SMTP, POP3, IMAP, LDAP

Examples

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);
  }
}

Return value

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.