CURLINFO_TLS_SESSION(3)

✨ CURLINFO_TLS_SESSION(3) ✨

okay so bestie, welcome to the CURLINFO_TLS_SESSION(3) page from the Library Functions Manual 💖 this one is a legacy icon, and we're gonna get into the whole TLS session info situation together. no cap.

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🌸 NAME 🌸

CURLINFO_TLS_SESSION — TLS session info. that's the vibe 💅

🎀 SYNOPSIS 🎀

#include <curl/curl.h>

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

💅 DESCRIPTION 💅

okay so first thing's first: this option has been superseded by CURLINFO_TLS_SSL_PTR(3) — literally, it's the newer icon and you should probably be using that unless you have a reason not to.

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. yes bestie, she's vintage — treat this one like the old flip phone in the drawer, not your main character energy.

⭐ 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)

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that's the tea, bestie 🫶 this page is from libcurl, dated 2026-10-12, and the header/footer name is CURLINFO_TLS_SESSION(3). mwah 💋