.\" ************************************************************************** .\" * _ _ ____ _ .\" * Project ___| | | | _ \| | .\" * / __| | | | |_) | | .\" * | (__| |_| | _ <| |___ .\" * \___|\___/|_| \_\_____| .\" * .\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al. .\" * .\" * This software is licensed as described in the file COPYING, which .\" * you should have received as part of this distribution. The terms .\" * are also available at http://curl.haxx.se/docs/copyright.html. .\" * .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell .\" * copies of the Software, and permit persons to whom the Software is .\" * furnished to do so, under the terms of the COPYING file. .\" * .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY .\" * KIND, either express or implied. .\" * .\" ************************************************************************** .\" .TH CURLOPT_USE_SSL 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options" .SH NAME CURLOPT_USE_SSL \- request using SSL / TLS for the transfer .SH SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USE_SSL, long level); .SH DESCRIPTION Pass a long using one of the values from below, to make libcurl use your desired \fIlevel\fP 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. .IP CURLUSESSL_NONE Don't attempt to use SSL. .IP CURLUSESSL_TRY Try using SSL, proceed as normal otherwise. .IP CURLUSESSL_CONTROL Require SSL for the control connection or fail with \fICURLE_USE_SSL_FAILED\fP. .IP CURLUSESSL_ALL Require SSL for all communication or fail with \fICURLE_USE_SSL_FAILED\fP. .SH DEFAULT CURLUSESSL_NONE .SH PROTOCOLS FTP, SMTP, POP3, IMAP .SH EXAMPLE .nf 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, CURLUSESSL_ALL); /* Perform the request */ curl_easy_perform(curl); } .fi .SH AVAILABILITY Added in 7.11.0. This option was known as CURLOPT_FTP_SSL up to 7.16.4, and the constants were known as CURLFTPSSL_* .SH RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. .SH "SEE ALSO" .BR CURLOPT_SSLVERSION "(3), " CURLOPT_SSL_OPTIONS "(3), "