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CURLINFO_CERTINFO(3)                libcurl               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 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),

libcurl 8.1.2                   April 26, 2023            CURLINFO_CERTINFO(3)

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