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DNS Over HTTPS Proxy (https-dns-proxy)

A lean RFC8484-compatible (no JSON API support) DNS-over-HTTPS (DoH) proxy service which supports DoH servers ran by AdGuard, CleanBrowsing, Cloudflare, Google, ODVR (nic.cz) and Quad9. Please see the README for further information. Based on @aarond10's https-dns-proxy.

Features

RFC8484-compatible DoH Proxy.
Compact size.
Web UI (luci-app-https-dns-proxy) available.
(By default) automatically updates DNSMASQ settings to use DoH proxy when it's started and reverts to old DNSMASQ resolvers when DoH proxy is stopped.

Screenshots (luci-app-https-dns-proxy)

Requirements

This proxy requires the following packages to be installed on your router: libc, libcares, libcurl, libev, ca-bundle. They will be automatically installed when you're installing https-dns-proxy.

Unmet Dependencies

If you are running a development (trunk/snapshot) build of OpenWrt/LEDE Project on your router and your build is outdated (meaning that packages of the same revision/commit hash are no longer available and when you try to satisfy the requirements you get errors), please flash either current LEDE release image or current development/snapshot image.

How To Install

Install https-dns-proxy and luci-app-https-dns-proxy packages from Web UI or run the following in the command line:

opkg update; opkg install https-dns-proxy luci-app-https-dns-proxy;

Default Settings

Default configuration has service enabled and starts the service with Google and Cloudflare DoH servers. In most configurations, you will keep the default DNSMASQ service installed to handle requests from devices in your local network and point DNSMASQ to use https-dns-proxy for name resolution.

By default, the service will intelligently override existing DNSMASQ servers settings on start to use the DoH servers and restores original DNSMASQ servers on stop. See the Configuration Settings section below for more information and how to disable this behavior.

Configuration Settings

Configuration contains the (named) "main" config section where you can configure which DNSMASQ settings the service will automatically affect and the typed (unnamed) https-dns-proxy instance settings. The original config file is included below:

config main 'config'
  option update_dnsmasq_config '*'

config https-dns-proxy
  option bootstrap_dns '8.8.8.8,8.8.4.4'
  option resolver_url 'https://dns.google/dns-query'
  option listen_addr '127.0.0.1'
  option listen_port '5053'
  option user 'nobody'
  option group 'nogroup'

config https-dns-proxy
  option bootstrap_dns '1.1.1.1,1.0.0.1'
  option resolver_url 'https://cloudflare-dns.com/dns-query'
  option listen_addr '127.0.0.1'
  option listen_port '5054'
  option user 'nobody'
  option group 'nogroup'```

The update_dnsmasq_config option can be set to dash (set to '-' to not change DNSMASQ server settings on start/stop), can be set to '*' to affect all DNSMASQ instance server settings or have a space-separated list of DNSMASQ instances to affect (like '0 4 5'). If this option is omitted, the default setting is '*'.

Starting with https-dns-proxy version 2019-12-03-3 and higher, when the service is set to update the DNSMASQ servers setting on start/stop, it does not override entries which contain either # or /, so the entries like listed below will be kept in use:

  list server '/onion/127.0.0.1#65453'
  list server '/openwrt.org/8.8.8.8'
  list server '/pool.ntp.org/8.8.8.8'
  list server '127.0.0.1#15353'
  list server '127.0.0.1#55353'
  list server '127.0.0.1#65353'

The https-dns-proxy instance settings are:

Parameter	Type	Default	Description
bootstrap_dns	IP Address		The non-encrypted DNS servers to be used to resolve the DoH server name on start.
edns_subnet	Subnet		EDNS Subnet address can be supplied to supported DoH servers to provide local resolution results.
listen_addr	IP Address	127.0.0.1	The local IP address to listen to requests.
listen_port	port	5053 and up	If this setting is omitted, the service will start the first https-dns-proxy instance on port 5053, second on 5054 and so on.
logfile	Full filepath		Full filepath to the file to log the instance events to.
resolver_url	URL		The https URL to the RFC8484-compatible resolver.
proxy_server	URL		Local proxy server to use when accessing resolvers.
user	String	nobody	Local user to run instance under.
group	String	nogroup	Local group to run instance under.
use_http1	Boolean	0	If set to 1, use HTTP/1 on installations with broken/outdated `curl` package. Included for posterity reasons, you will most likely not ever need it on OpenWrt.
verbosity	Integer		Use setting between 1 to 4 to control the logging verbosity level.

Thanks

This OpenWrt package wouldn't have been possible without @aarond10's https-dns-proxy and his active participation in the OpenWrt package itself. Special thanks to @jow- for general package/luci guidance.

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