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CURLOPT_CERTINFO(3)                 libcurl                CURLOPT_CERTINFO(3)


NAME

       CURLOPT_CERTINFO - request SSL certificate information


SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CERTINFO, long certinfo);


DESCRIPTION

       Pass a long set to 1 to enable libcurl's certificate chain info
       gatherer. With this enabled, libcurl will extract lots of information
       and data about the certificates in the certificate chain used in the
       SSL connection. This data may then be retrieved after a transfer using
       curl_easy_getinfo(3) and its option CURLINFO_CERTINFO(3).


DEFAULT

       0


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 supported by the OpenSSL, GnuTLS, Schannel, NSS, GSKit
       and Secure Transport backends. Schannel support added in 7.50.0. Secure
       Transport support added in 7.79.0.


RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.


SEE ALSO

       CURLOPT_CAINFO(3), CURLOPT_SSL_VERIFYPEER(3),

ibcurl 8.1.2                    April 26, 2023             CURLOPT_CERTINFO(3)

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