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                     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), "