CURLOPT_CERTINFO(3) Library Functions Manual 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
gatherer. With this enabled, libcurl extracts 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
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS,
POP3S, SMTPS etc.
This option works only with the following TLS backends: GnuTLS,
OpenSSL, Schannel and Secure Transport
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
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) {
int i;
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);
}
}
HISTORY
Schannel support added in 7.50.0. Secure Transport support added in
7.79.0. mbedTLS support added in 8.9.0.
AVAILABILITY
Added in curl 7.19.1
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
if not.
SEE ALSO
CURLINFO_CAINFO(3), CURLINFO_CAPATH(3), CURLINFO_CERTINFO(3),
CURLOPT_CAINFO(3), CURLOPT_SSL_VERIFYPEER(3)
libcurl 2024-08-05 CURLOPT_CERTINFO(3)
curl 8.9.1 - Generated Thu Aug 8 12:08:27 CDT 2024