CURLINFO_TLS_SESSION(3) Introduction to Library Functions

NAME

CURLINFO_TLS_SESSION - 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This option has been superseded by CURLINFO_TLS_SSL_PTR(3).

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

OpenSSL:
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.

wolfSSL
CURLINFO_TLS_SESSION(3) wolfSSL session internals is
WOLFSSL_CTX *.

CURLINFO_TLS_SSL_PTR(3) wolfSSL session internals is WOLFSSL
*.

You can obtain an WOLFSSL_CTX pointer from an SSL pointer
using wolfSSL function wolfSSL_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 result;
struct curl_tlssessioninfo *tls;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
result = curl_easy_perform(curl);
if(result)
printf("error: %s\n", curl_easy_strerror(result));
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 2026-01-08 CURLINFO_TLS_SESSION(3)