CURLOPT_DOH_URL - Online Linux Manual PageSection : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options
NAMECURLOPT_DOH_URL − provide the DNS-over-HTTPS URL
SYNOPSIS#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);
DESCRIPTIONPass 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 OPTIONSDoH 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(3) callback is not inherited.
DEFAULTNULL - there is no default DoH URL. If this option is not set, libcurl will use the default name resolver.
PROTOCOLSAll
EXAMPLECURL *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);
}
AVAILABILITYAdded in 7.62.0
RETURN VALUEReturns 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 ALSOCURLOPT_VERBOSE(3), CURLOPT_RESOLVE (3)," 0
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