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 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  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 7.58.0                                    May 06, 2017                              CURLINFO_CERTINFO(3)