Tribblix: manual page: CURLINFO_TLS

CURLINFO_TLS_SESSION(3) Introduction to Library Functions

NAME

CURLINFO_TLS_SESSION - get TLS session info

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_TLS_SESSION,
struct curl_tlssessioninfo **session);

DESCRIPTION

This option has been superseded by CURLINFO_TLS_SSL_PTR(3) which was
added in 7.48.0. The only reason you would use this option instead is
if you could be using a version of libcurl earlier than 7.48.0.

This option is exactly the same as CURLINFO_TLS_SSL_PTR(3) except in
the case of OpenSSL. If the session backend is CURLSSLBACKEND_OPENSSL
the session internals pointer varies depending on the option:

CURLINFO_TLS_SESSION(3) OpenSSL session internals is SSL_CTX *.

CURLINFO_TLS_SSL_PTR(3) OpenSSL session internals is SSL *.

You can obtain an SSL_CTX pointer from an SSL pointer using OpenSSL
function SSL_get_SSL_CTX(3). Therefore unless you need compatibility
with older versions of libcurl use CURLINFO_TLS_SSL_PTR(3). Refer to
that document for more information.

PROTOCOLS

This functionality affects all TLS based protocols: HTTPS, FTPS,
IMAPS, POP3S, SMTPS etc.

This option works only with the following TLS backends: GnuTLS and
OpenSSL

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
struct curl_tlssessioninfo *tls;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
res = curl_easy_perform(curl);
if(res)
printf("error: %s\n", curl_easy_strerror(res));
curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &tls);
curl_easy_cleanup(curl);
}
}

DEPRECATED

Deprecated since 7.48.0

AVAILABILITY

Added in curl 7.34.0

RETURN VALUE

curl_easy_getinfo(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).