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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), "