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),