CURLINFO_TLS_SESSION(3) Library Functions Manual CURLINFO_TLS_SESSION(3)
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This option has been superseded by CURLINFO_TLS_SSL_PTR(3) which was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).
SEE ALSO
CURLINFO_TLS_SSL_PTR(3), curl_easy_getinfo(3), curl_easy_setopt(3)
libcurl 2026-07-12 CURLINFO_TLS_SESSION(3)
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