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        !            22: .\"
        !            23: .TH CURLOPT_CERTINFO 3 "January 29, 2019" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_CERTINFO \- request SSL certificate information
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CERTINFO, long certinfo);
        !            31: .SH DESCRIPTION
        !            32: Pass a long set to 1 to enable libcurl's certificate chain info gatherer. With
        !            33: this enabled, libcurl will extract lots of information and data about the
        !            34: certificates in the certificate chain used in the SSL connection. This data
        !            35: may then be retrieved after a transfer using \fIcurl_easy_getinfo(3)\fP and
        !            36: its option \fICURLINFO_CERTINFO(3)\fP.
        !            37: .SH DEFAULT
        !            38: 0
        !            39: .SH PROTOCOLS
        !            40: All TLS-based
        !            41: .SH EXAMPLE
        !            42: .nf
        !            43: curl = curl_easy_init();
        !            44: if(curl) {
        !            45:   curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
        !            46: 
        !            47:   /* connect to any HTTPS site, trusted or not */
        !            48:   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        !            49:   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
        !            50: 
        !            51:   curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
        !            52: 
        !            53:   res = curl_easy_perform(curl);
        !            54: 
        !            55:   if (!res) {
        !            56:     struct curl_certinfo *ci;
        !            57:     res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
        !            58: 
        !            59:     if (!res) {
        !            60:       printf("%d certs!\\n", ci->num_of_certs);
        !            61: 
        !            62:       for(i = 0; i < ci->num_of_certs; i++) {
        !            63:         struct curl_slist *slist;
        !            64: 
        !            65:         for(slist = ci->certinfo[i]; slist; slist = slist->next)
        !            66:           printf("%s\\n", slist->data);
        !            67:       }
        !            68:     }
        !            69:   }
        !            70:   curl_easy_cleanup(curl);
        !            71: }
        !            72: .fi
        !            73: .SH AVAILABILITY
        !            74: This option is supported by the OpenSSL, GnuTLS, Schannel, NSS and GSKit
        !            75: backends.
        !            76: .SH RETURN VALUE
        !            77: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            78: .SH "SEE ALSO"
        !            79: .BR CURLOPT_CAINFO "(3), " CURLOPT_SSL_VERIFYPEER "(3), "