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.TH CURLINFO_TLS_SSL_PTR 3 "23 Feb 2016" "libcurl 7.48.0" "curl_easy_getinfo options"
.SH NAME
CURLINFO_TLS_SESSION, CURLINFO_TLS_SSL_PTR \- get TLS session info
.SH SYNOPSIS
.nf
#include <curl/curl.h>

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

/* if you need compatibility with libcurl < 7.48.0 use
   CURLINFO_TLS_SESSION instead: */

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_TLS_SESSION,
                           struct curl_tlssessioninfo **session);
.SH DESCRIPTION
Pass a pointer to a 'struct curl_tlssessioninfo *'.  The pointer will be
initialized to refer to a 'struct curl_tlssessioninfo *' that will contain an
enum indicating the SSL library used for the handshake and a pointer to the
respective internal TLS session structure of this underlying SSL library.

This may then be used to extract certificate information in a format
convenient for further processing, such as manual validation. NOTE: this
option may not be available for all SSL backends; unsupported SSL backends
will always return NULL in the \fIinternals\fP pointer to indicate that they
are not supported.

.nf
struct curl_tlssessioninfo {
  curl_sslbackend backend;
  void *internals;
};
.fi

The \fIbackend\fP struct member is one of the defines in the CURLSSLBACKEND_*
series: CURLSSLBACKEND_NONE (when built without TLS support),
CURLSSLBACKEND_AXTLS, CURLSSLBACKEND_CYASSL, CURLSSLBACKEND_DARWINSSL,
CURLSSLBACKEND_GNUTLS, CURLSSLBACKEND_GSKIT, CURLSSLBACKEND_MBEDTLS,
CURLSSLBACKEND_NSS, CURLSSLBACKEND_OPENSSL, CURLSSLBACKEND_POLARSSL or
CURLSSLBACKEND_SCHANNEL. (Note that the OpenSSL forks are all reported as just
OpenSSL here.)

The \fIinternals\fP struct member will point to a TLS library specific pointer
for the active ("in use") SSL connection, with the following underlying types:
.RS
.IP GnuTLS
gnutls_session_t
.IP gskit
gsk_handle
.IP NSS
PRFileDesc *
.IP OpenSSL
CURLINFO_TLS_SESSION: SSL_CTX *

CURLINFO_TLS_SSL_PTR: SSL *
.RE
Since 7.48.0 the \fIinternals\fP member can point to these other SSL backends
as well:
.RS
.IP axTLS
SSL *
.IP mbedTLS
mbedtls_ssl_session *
.IP PolarSSL
ssl_session *
.IP "Secure Channel (WinSSL)"
CtxtHandle *
.IP "Secure Transport (DarwinSSL)"
SSLContext *
.IP "WolfSSL (formerly CyaSSL)"
SSL *
.RE
.SH PROTOCOLS
All TLS-based
.SH EXAMPLE
TODO
.SH AVAILABILITY
Added in 7.48.0.

This option supersedes \fICURLINFO_TLS_SESSION(3)\fP which was added in 7.34.0.
This option is exactly the same as that option except in the case of OpenSSL.
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "
.BR CURLINFO_TLS_SESSION "(3), "