CURLOPT_CERTINFO(3) curl_easy_setopt options CURLOPT_CERTINFO(3)
NAME
CURLOPT_CERTINFO - request SSL certificate information
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CERTINFO, long certinfo);
DESCRIPTION
Pass a long set to 1 to enable libcurl's certificate chain info gath-
erer. With this enabled, libcurl will extract lots of information and
data about the certificates in the certificate chain used in the SSL
connection. This data may then be retrieved after a transfer using
curl_easy_getinfo(3) and its option CURLINFO_CERTINFO(3).
DEFAULT
0
PROTOCOLS
All TLS-based
EXAMPLE
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
/* connect to any HTTPS site, trusted or not */
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);
res = curl_easy_perform(curl);
if (!res) {
struct curl_certinfo *ci;
res = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &ci);
if (!res) {
printf("%d certs!\n", ci->num_of_certs);
for(i = 0; i < ci->num_of_certs; i++) {
struct curl_slist *slist;
for(slist = ci->certinfo[i]; slist; slist = slist->next)
printf("%s\n", slist->data);
}
}
}
curl_easy_cleanup(curl);
}
AVAILABILITY
This option is supported by the OpenSSL, GnuTLS, Schannel, NSS, GSKit
and Secure Transport backends. Schannel support added in 7.50.0. Secure
Transport support added in 7.79.0.
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
if not.
SEE ALSO
CURLOPT_CAINFO(3), CURLOPT_SSL_VERIFYPEER(3),
libcurl 7.81.0 November 26, 2021 CURLOPT_CERTINFO(3)
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