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 will get it set to point to a struct that holds a
       number of linked lists with info about  the  certificate  chain,  assuming  you  had  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,  GSKit  or  Secure  Transport
       support. Schannel support added in 7.50.0. Secure Transport support added in 7.79.0.

       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),