CURLINFO_TLS_SESSION(3) Library Functions Manual CURLINFO_TLS_SESSION(3)
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This option has been superseded by CURLINFO_TLS_SSL_PTR(3).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 != CURLE_OK)
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 2026-03-23 CURLINFO_TLS_SESSION(3)
curl 8.19.0 - Generated Thu Mar 26 16:16:26 CDT 2026