99 lines
2.6 KiB
Markdown
99 lines
2.6 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_DOH_URL
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_DNS_CACHE_TIMEOUT (3)
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- CURLOPT_RESOLVE (3)
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- CURLOPT_VERBOSE (3)
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Protocol:
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- All
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Added-in: 7.62.0
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---
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# NAME
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CURLOPT_DOH_URL - provide the DNS-over-HTTPS URL
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);
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~~~
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# DESCRIPTION
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Pass in a pointer to a *URL* for the DoH server to use for name resolving. The
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parameter should be a char pointer to a null-terminated string which must be a
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valid and correct HTTPS URL.
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libcurl does not validate the syntax or use this variable until the transfer
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is issued. Even if you set a crazy value here, curl_easy_setopt(3) still
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returns *CURLE_OK*.
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curl sends POST requests to the given DNS-over-HTTPS URL.
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To find the DoH server itself, which might be specified using a name, libcurl
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uses the default name lookup function. You can bootstrap that by providing the
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address for the DoH server with CURLOPT_RESOLVE(3).
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The application does not have to keep the string around after setting this
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option.
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Using this option multiple times makes the last set string override the
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previous ones. Set it to NULL to disable its use again.
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# INHERIT OPTIONS
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DoH lookups use SSL and some SSL settings from your transfer are inherited,
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like CURLOPT_SSL_CTX_FUNCTION(3).
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The hostname and peer certificate verification settings are not inherited but
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can be controlled separately via CURLOPT_DOH_SSL_VERIFYHOST(3) and
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CURLOPT_DOH_SSL_VERIFYPEER(3).
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A set CURLOPT_OPENSOCKETFUNCTION(3) callback is not inherited.
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# KNOWN BUGS
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Even when DoH is set to be used with this option, there are still some name
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resolves that are performed without it, using the default name resolver
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mechanism. This includes name resolves done for CURLOPT_INTERFACE(3),
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CURLOPT_FTPPORT(3), a proxy type set to **CURLPROXY_SOCKS4** or
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**CURLPROXY_SOCKS5** and probably some more.
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# DEFAULT
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NULL
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://dns.example.com");
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curl_easy_perform(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient
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heap space.
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Note that curl_easy_setopt(3) does immediately parse the given string so
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when given a bad DoH URL, libcurl might not detect the problem until it later
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tries to resolve a name with it.
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