CURLINFO_CERTINFO(3)

1CURLINFO_CERTINFO(3)                libcurl               CURLINFO_CERTINFO(3)
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NAME

6       CURLINFO_CERTINFO - get the TLS certificate chain
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SYNOPSIS

9       #include <curl/curl.h>
10
11       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO,
12                                  struct curl_certinfo **chainp);
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DESCRIPTION

15       Pass  a  pointer to a struct curl_certinfo * and you will get it set to
16       point to a struct that holds a number of linked lists with  info  about
17       the  certificate  chain,  assuming  you had CURLOPT_CERTINFO(3) enabled
18       when the request was made. The struct reports how many certs  it  found
19       and  then you can extract info for each of those certs by following the
20       linked lists. The info chain is provided in a series  of  data  in  the
21       format "name:content" where the content is for the specific named data.
22       See also the certinfo.c example.
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PROTOCOLS

25       All TLS-based
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EXAMPLE

28       curl = curl_easy_init();
29       if(curl) {
30         curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
31
32         /* connect to any HTTPS site, trusted or not */
33         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
34         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
35
36         curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
37
38         res = curl_easy_perform(curl);
39
40         if (!res) {
41           struct curl_certinfo *ci;
42           res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
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44           if (!res) {
45             printf("%d certs!\n", ci->num_of_certs);
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47             for(i = 0; i < ci->num_of_certs; i++) {
48               struct curl_slist *slist;
49
50               for(slist = ci->certinfo[i]; slist; slist = slist->next)
51                 printf("%s\n", slist->data);
52             }
53           }
54         }
55         curl_easy_cleanup(curl);
56       }
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AVAILABILITY

59       This option is only working in libcurl built with OpenSSL, NSS,  Schan‐
60       nel,  GSKit  or  Secure  Transport  support.  Schannel support added in
61       7.50.0. Secure Transport support added in 7.79.0.
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63       Added in 7.19.1
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RETURN VALUE

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