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        !            23: .TH CURLINFO_CERTINFO 3 "March 23, 2020" "libcurl 7.70.0" "curl_easy_getinfo options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLINFO_CERTINFO \- get the TLS certificate chain
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO,
        !            31:                            struct curl_certinfo *chainp);
        !            32: .SH DESCRIPTION
        !            33: Pass a pointer to a 'struct curl_certinfo *' and you'll get it set to point to
        !            34: struct that holds a number of linked lists with info about the certificate
        !            35: chain, assuming you had \fICURLOPT_CERTINFO(3)\fP enabled when the request was
        !            36: made. The struct reports how many certs it found and then you can extract info
        !            37: for each of those certs by following the linked lists. The info chain is
        !            38: provided in a series of data in the format "name:content" where the content is
        !            39: for the specific named data. See also the certinfo.c example.
        !            40: .SH PROTOCOLS
        !            41: All TLS-based
        !            42: .SH EXAMPLE
        !            43: .nf
        !            44: curl = curl_easy_init();
        !            45: if(curl) {
        !            46:   curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
        !            47: 
        !            48:   /* connect to any HTTPS site, trusted or not */
        !            49:   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        !            50:   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
        !            51: 
        !            52:   curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
        !            53: 
        !            54:   res = curl_easy_perform(curl);
        !            55: 
        !            56:   if (!res) {
        !            57:     struct curl_certinfo *ci;
        !            58:     res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
        !            59: 
        !            60:     if (!res) {
        !            61:       printf("%d certs!\\n", ci->num_of_certs);
        !            62: 
        !            63:       for(i = 0; i < ci->num_of_certs; i++) {
        !            64:         struct curl_slist *slist;
        !            65: 
        !            66:         for(slist = ci->certinfo[i]; slist; slist = slist->next)
        !            67:           printf("%s\\n", slist->data);
        !            68:       }
        !            69:     }
        !            70:   }
        !            71:   curl_easy_cleanup(curl);
        !            72: }
        !            73: .fi
        !            74: .SH AVAILABILITY
        !            75: This option is only working in libcurl built with OpenSSL, NSS, Schannel or
        !            76: GSKit support. Schannel support added in 7.50.0
        !            77: 
        !            78: Added in 7.19.1
        !            79: .SH RETURN VALUE
        !            80: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
        !            81: .SH "SEE ALSO"
        !            82: .BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "