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23 .TH CURLINFO_CERTINFO 3 "May 06, 2017" "libcurl 7.59.0" "curl_easy_getinfo options"
26 CURLINFO_CERTINFO \- get the TLS certificate chain
28 #include <curl/curl.h>
30 CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CERTINFO,
31 struct curl_certinfo *chainp);
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.
44 curl = curl_easy_init();
46 curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
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);
52 curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
54 res = curl_easy_perform(curl);
57 struct curl_certinfo *ci;
58 res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
61 printf("%d certs!\\n", ci->num_of_certs);
63 for(i = 0; i < ci->num_of_certs; i++) {
64 struct curl_slist *slist;
66 for(slist = ci->certinfo[i]; slist; slist = slist->next)
67 printf("%s\\n", slist->data);
71 curl_easy_cleanup(curl);
75 This option is only working in libcurl built with OpenSSL, NSS, schannel or
76 GSKit support. schannel support added in 7.50.0
80 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
82 .BR curl_easy_getinfo "(3), " curl_easy_setopt "(3), "