mirror of
https://github.com/curl/curl.git
synced 2026-06-18 20:45:38 +03:00
952b04474c
- badwords: replace stray synonyms with 'null-terminator'. - tests/FILEFORMAT.md: tidy up feature descriptions. - printf: replace stray `%i` masks with `%d` for consistency. - pytest: add comments for empty excepts to try silencing GitHub CodeQL warnings. - tool1394, unit1675: merge nested `if`s. - dnscache: fix typo in comment. - fix whitespace, indent and newlines. Closes #21921
104 lines
2.8 KiB
Markdown
104 lines
2.8 KiB
Markdown
---
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
SPDX-License-Identifier: curl
|
|
Title: CURLOPT_DOH_URL
|
|
Section: 3
|
|
Source: libcurl
|
|
See-also:
|
|
- CURLOPT_DNS_CACHE_TIMEOUT (3)
|
|
- CURLOPT_RESOLVE (3)
|
|
- CURLOPT_VERBOSE (3)
|
|
Protocol:
|
|
- All
|
|
Added-in: 7.62.0
|
|
---
|
|
|
|
# NAME
|
|
|
|
CURLOPT_DOH_URL - provide the DNS-over-HTTPS URL
|
|
|
|
# SYNOPSIS
|
|
|
|
~~~c
|
|
#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 pointer to a null-terminated string which must be a
|
|
valid and correct 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).
|
|
|
|
The application does not have to keep the string around after setting this
|
|
option.
|
|
|
|
Using this option multiple times makes the last set string override the
|
|
previous ones. Set it to NULL to disable its use again.
|
|
|
|
DoH lookups do not inherit proxy options from its parent transfer.
|
|
|
|
# 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.
|
|
|
|
# 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_INTERFACE(3),
|
|
CURLOPT_FTPPORT(3), a proxy type set to **CURLPROXY_SOCKS4** or
|
|
**CURLPROXY_SOCKS5** and probably some more.
|
|
|
|
# DEFAULT
|
|
|
|
NULL
|
|
|
|
# %PROTOCOLS%
|
|
|
|
# EXAMPLE
|
|
|
|
~~~c
|
|
int main(void)
|
|
{
|
|
CURL *curl = curl_easy_init();
|
|
if(curl) {
|
|
CURLcode result;
|
|
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
|
|
curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://dns.example.com");
|
|
result = curl_easy_perform(curl);
|
|
curl_easy_cleanup(curl);
|
|
}
|
|
}
|
|
~~~
|
|
|
|
# %AVAILABILITY%
|
|
|
|
# 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).
|
|
|
|
Note that curl_easy_setopt(3) does not 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.
|