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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*handle, CURLINFO_TLS_SESSION, struct curl_tlssessioninfo **session); DESCRIPTION This option has been superseded by CURLINFO_TLS_SSL_PTR(3) which was added in 7.48.0.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 and wolfSSL. If the session backend is CURLSSLBACK- END_OPENSSL the session internals pointer varies depending on the op- tion: 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 infor- mation. 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 infor- mation. 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 2025-11-01 CURLINFO_TLS_SESSION(3)
NAME | SYNOPSIS | DESCRIPTION | PROTOCOLS | EXAMPLE | DEPRECATED | AVAILABILITY | RETURN VALUE | SEE ALSO
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