x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
CURLOPT_DOH_URL(3) libcurl CURLOPT_DOH_URL(3)
NAME
CURLOPT_DOH_URL - provide the DNS-over-HTTPS URL
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);
DESCRIPTION
Pass in a pointer to a URL for the DoH server to use for name resolv-
ing. The parameter should be a char * to a null-terminated string which
must be URL-encoded in the following format: "https://host:port/path".
It MUST specify an HTTPS URL.
libcurl does not validate the syntax or use this variable until the
transfer is issued. Even if you set a crazy value here,
curl_easy_setopt(3) still returns CURLE_OK.
curl sends POST requests to the given DNS-over-HTTPS URL.
To find the DoH server itself, which might be specified using a name,
libcurl uses the default name lookup function. You can bootstrap that
by providing the address for the DoH server with CURLOPT_RESOLVE(3).
Disable DoH use again by setting this option to NULL.
INHERIT OPTIONS
DoH lookups use SSL and some SSL settings from your transfer are inher-
ited, like CURLOPT_SSL_CTX_FUNCTION(3).
The hostname and peer certificate verification settings are not inher-
ited but can be controlled separately via CURLOPT_DOH_SSL_VERIFYHOST(3)
and CURLOPT_DOH_SSL_VERIFYPEER(3).
A set CURLOPT_OPENSOCKETFUNCTION(3) callback is not inherited.
KNOWN BUGS
Even when DoH is set to be used with this option, there are still some
name resolves that are performed without it, using the default name
resolver mechanism. This includes name resolves done for CURLOPT_INTER-
FACE(3), CURLOPT_FTPPORT(3), a proxy type set to CURLPROXY_SOCKS4 or
CURLPROXY_SOCKS5 and probably some more.
DEFAULT
NULL - there is no default DoH URL. If this option is not set, libcurl
uses the default name resolver.
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://dns.example.com");
curl_easy_perform(curl);
}
AVAILABILITY
Added in 7.62.0
RETURN VALUE
Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insuf-
ficient heap space.
Note that curl_easy_setopt(3) does immediately parse the given string
so when given a bad DoH URL, libcurl might not detect the problem until
it later tries to resolve a name with it.
SEE ALSO
CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_RESOLVE(3), CURLOPT_VERBOSE(3)
ibcurl 8.4.0 September 26, 2023 CURLOPT_DOH_URL(3)
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