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);
CURLOPT_USE_SSL(3) curl_easy_setopt options 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 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 EXAMPLE 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); } 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_* Handled by LDAP since 7.81.0. Fully supported by the openldap backend only. RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLOPT_SSLVERSION(3), CURLOPT_PROXY_SSLVERSION(3), CUR- LOPT_SSL_OPTIONS(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 November 30, 2021 CURLOPT_USE_SSL(3)