CURLINFO_CERTINFO(3)       curl_easy_getinfo options      CURLINFO_CERTINFO(3)

NAME
       CURLINFO_CERTINFO - get the TLS certificate chain

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO,
                                  struct curl_certinfo **chainp);

DESCRIPTION
       Pass a pointer to a 'struct curl_certinfo *' and you'll get it set to
       point to a struct that holds a number of linked lists with info about
       the certificate chain, assuming you had _CERTINFO&section=3">CURLOPT_CERTINFO(3) enabled
       when the request was made. The struct reports how many certs it found
       and then you can extract info for each of those certs by following the
       linked lists. The info chain is provided in a series of data in the
       format "name:content" where the content is for the specific named data.
       See also the certinfo.c example.

PROTOCOLS
       All TLS-based

EXAMPLE
       curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");

         /* connect to any HTTPS site, trusted or not */
         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);

         curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);

         res = curl_easy_perform(curl);

         if (!res) {
           struct curl_certinfo *ci;
           res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);

           if (!res) {
             printf("%d certs!\n", ci->num_of_certs);

             for(i = 0; i < ci->num_of_certs; i++) {
               struct curl_slist *slist;

               for(slist = ci->certinfo[i]; slist; slist = slist->next)
                 printf("%s\n", slist->data);
             }
           }
         }
         curl_easy_cleanup(curl);
       }

AVAILABILITY
       This option is only working in libcurl built with OpenSSL, NSS,
       Schannel or GSKit support. Schannel support added in 7.50.0

       Added in 7.19.1

RETURN VALUE
       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       curl_easy_getinfo(3), curl_easy_setopt(3),

libcurl 7.77.0                 November 4, 2020           CURLINFO_CERTINFO(3)