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.\" generated by cd2nroff 0.1 from CURLINFO_TLS_SESSION.md
.TH CURLINFO_TLS_SESSION 3 "2025-06-27" libcurl
.SH NAME
CURLINFO_TLS_SESSION \- get TLS session info
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_TLS_SESSION,
struct curl_tlssessioninfo **session);
.fi
.SH DESCRIPTION
\fBThis option has been superseded\fP by \fICURLINFO_TLS_SSL_PTR(3)\fP which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 \fICURLINFO_TLS_SSL_PTR(3)\fP except in the
case of OpenSSL. If the session \fIbackend\fP is CURLSSLBACKEND_OPENSSL the
session \fIinternals\fP pointer varies depending on the option:
\fICURLINFO_TLS_SESSION(3)\fP OpenSSL session \fIinternals\fP is \fBSSL_CTX \fP*.
\fICURLINFO_TLS_SSL_PTR(3)\fP OpenSSL session \fIinternals\fP is \fBSSL \fP*.
You can obtain an \fBSSL_CTX\fP pointer from an SSL pointer using OpenSSL
function \fISSL_get_SSL_CTX(3)\fP. Therefore unless you need compatibility
with older versions of libcurl use \fICURLINFO_TLS_SSL_PTR(3)\fP. Refer to
that document for more information.
.SH 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
.SH EXAMPLE
.nf
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);
}
}
.fi
.SH DEPRECATED
Deprecated since 7.48.0
.SH AVAILABILITY
Added in curl 7.34.0
.SH RETURN VALUE
\fIcurl_easy_getinfo(3)\fP returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLINFO_TLS_SSL_PTR (3),
.BR curl_easy_getinfo (3),
.BR curl_easy_setopt (3)