Tribblix: manual page: CURLOPT_DOH_SSL

CURLOPT_DOH_SSL_VERIFYSTATUS(3) Introduction to Library Functions

NAME

CURLOPT_DOH_SSL_VERIFYSTATUS - verify the DoH SSL certificate's
status

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_SSL_VERIFYSTATUS,
long verify);

DESCRIPTION

Pass a long as parameter set to 1 to enable or 0 to disable.

This option determines whether libcurl verifies the status of the DoH
(DNS-over-HTTPS) server cert using the "Certificate Status Request"
TLS extension (aka. OCSP stapling).

This option is the DoH equivalent of CURLOPT_SSL_VERIFYSTATUS(3) and
only affects requests to the DoH server.

If this option is enabled and the server does not support the TLS
extension, the verification fails.

DEFAULT

PROTOCOLS

This functionality affects all TLS based protocols: HTTPS, FTPS,
IMAPS, POP3S, SMTPS etc.

This option works only with the following TLS backends: GnuTLS and
OpenSSL

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

curl_easy_setopt(curl, CURLOPT_DOH_URL,
"https://cloudflare-dns.com/dns-query");

/* Ask for OCSP stapling when verifying the DoH server */
curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYSTATUS, 1L);

curl_easy_perform(curl);
}
}

AVAILABILITY

Added in curl 7.76.0

RETURN VALUE

curl_easy_setopt(3) returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).