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x SuSE Linux 13.1-RELEASEx
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 it is set to point to a
       struct that holds info about the server's certificate  chain,  assuming
       you had CURLOPT_CERTINFO(3) enabled when the request was made.

       struct curl_certinfo {
         int num_of_certs;
         struct curl_slist **certinfo;
       };

       The  certinfo  struct member is an array of linked lists of certificate
       information. The num_of_certs struct member is the number  of  certifi-
       cates  which is the number of elements in the array. Each certificate's
       list has items with textual information in  the  format  "name:content"
       such as "Subject:Foo", "Issuer:Bar", etc. The items in each list varies
       depending on the SSL backend and the certificate.

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);
       }

       See also the certinfo.c example.

AVAILABILITY
       This option is only working in  libcurl  built  with  OpenSSL,  GnuTLS,
       Schannel  or Secure Transport. GnuTLS support added in 7.42.0. 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), CURLINFO_CAPATH(3)

libcurl 8.4.0                 September 26, 2023          CURLINFO_CERTINFO(3)

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