table of contents
- bullseye 7.74.0-1.3+deb11u1
- bullseye-backports 7.82.0-2~bpo11+1
- testing 7.83.1-2
- unstable 7.84.0-1
CURLOPT_DOH_URL(3) | curl_easy_setopt options | 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 resolving. 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 a 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) will still return 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 will use 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 inherited, like CURLOPT_SSL_CTX_FUNCTION(3).
The hostname and peer certificate verification settings are not inherited 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.
DEFAULT¶
NULL - there is no default DoH URL. If this option is not set, libcurl will use 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 insufficient heap space.
Note that curl_easy_setopt(3) will not actually parse the given string so given a bad DoH URL, curl will not detect a problem until it tries to resolve a name with it.
SEE ALSO¶
November 26, 2021 | libcurl 7.82.0 |