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https-dns-proxy: fix deleting server items, configurable dnsmasq settings change

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Signed-off-by: Stan Grishin <stangri@melmac.net>
This commit is contained in:
Stan Grishin 2020-01-25 21:15:13 -07:00
parent 9e1fcfa6eb
commit 8da1c41104
4 changed files with 137 additions and 18 deletions
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2
net/https-dns-proxy/Makefile
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@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=https-dns-proxy
PKG_VERSION:=2019-12-03
PKG_RELEASE=1
PKG_RELEASE=3
PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL:=https://github.com/aarond10/https_dns_proxy

94
net/https-dns-proxy/files/README.md Normal file
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@ -0,0 +1,94 @@
# 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](https://github.com/stangri/openwrt_packages/blob/master/https-dns-proxy/files/README.md) for further information. Based on [@aarond10](https://github.com/aarond10)'s [https-dns-proxy](https://github.com/aarond10/https_dns_proxy).
## Features
- [RFC8484](https://tools.ietf.org/html/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)
![screenshot](https://raw.githubusercontent.com/stangri/openwrt_packages/master/screenshots/https-dns-proxy/screenshot01.png "https-dns-proxy screenshot")
## 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If you are running a development (trunk/snapshot) build of OpenWrt/LEDE Project on your router and your build is outdated (meaning that packages of the same revision/commit hash are no longer available and when you try to satisfy the [requirements](#requirements) you get errors),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:
```sh
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](#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:
```text
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:
```test
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.|String
## Thanks
This OpenWrt package wouldn't have been possible without [@aarond10](https://github.com/aarond10)'s [https-dns-proxy](https://github.com/aarond10/https_dns_proxy) and his active participation in the OpenWrt package itself. Special thanks to [@jow-](https://github.com/jow-) for general package/luci guidance.

3
net/https-dns-proxy/files/https-dns-proxy.config
View file

@ -1,3 +1,6 @@
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'

56
net/https-dns-proxy/files/https-dns-proxy.init
View file

@ -5,6 +5,8 @@
export START=80
export USE_PROCD=1
dnsmasqConfig=''
PROG=/usr/sbin/https-dns-proxy
xappend() { param="$param $1"; }
@ -42,7 +44,7 @@ append_match() {
}
start_instance() {
local cfg="$1" param listen_addr listen_port
local cfg="$1" param listen_addr listen_port i
append_parm "$cfg" 'listen_addr' '-a' '127.0.0.1'
append_parm "$cfg" 'listen_port' '-p' "$p"
@ -67,9 +69,14 @@ start_instance() {
config_get listen_addr "$cfg" 'listen_addr' '127.0.0.1'
config_get listen_port "$cfg" 'listen_port' "$p"
config_load 'dhcp'
# shellcheck disable=SC2154
config_foreach dnsmasq_add_doh_server 'dnsmasq' "${listen_addr}#${listen_port}"
if [ "$dnsmasqConfig" = "*" ]; then
config_load 'dhcp'
config_foreach dnsmasq_add_doh_server 'dnsmasq' "${listen_addr}#${listen_port}"
elif [ -n "$dnsmasqConfig" ]; then
for i in $dnsmasqConfig; do
dnsmasq_add_doh_server "@dnsmasq[${i}]" "${listen_addr}#${listen_port}"
done
fi
p="$((p+1))"
}
@ -79,12 +86,11 @@ service_triggers() {
start_service() {
local p=5053
config_load 'https-dns-proxy'
config_get dnsmasqConfig 'config' 'update_dnsmasq_config' '*'
dhcp_backup 'create'
config_load 'https-dns-proxy'
config_foreach start_instance 'https-dns-proxy'
if [ -z "$(uci -q get dhcp.@dnsmasq[0].server)" ]; then
dhcp_backup 'restore'
fi
if [ -n "$(uci -q changes dhcp)" ]; then
uci -q commit dhcp
[ -x /etc/init.d/dnsmasq ] && /etc/init.d/dnsmasq restart >/dev/null 2>&1
@ -92,6 +98,8 @@ start_service() {
}
stop_service() {
config_load 'https-dns-proxy'
config_get dnsmasqConfig 'config' 'update_dnsmasq_config' '*'
dhcp_backup 'restore'
if [ -n "$(uci -q changes dhcp)" ]; then
uci -q commit dhcp
@ -105,35 +113,49 @@ service_triggers() {
dnsmasq_add_doh_server() {
local cfg="$1" value="$2"
uci -q del_list dhcp."$cfg".server="$value"
uci -q add_list dhcp."$cfg".server="$value"
}
dnsmasq_create_server_backup() {
local cfg="$1" i
if ! uci -q get "dhcp.$cfg.doh_backup_server" >/dev/null; then
for i in $(uci -q get "dhcp.$cfg.server"); do
uci -q add_list dhcp."$cfg".doh_backup_server="$i"
done
fi
uci -q del "dhcp.$cfg.server"
local cfg="$1"
local i
uci -q get "dhcp.$cfg.doh_backup_server" >/dev/null && return 0
for i in $(uci -q get "dhcp.$cfg.server"); do
uci -q add_list dhcp."$cfg".doh_backup_server="$i"
if [ "$i" = "${i//127.0.0.1}" ] && [ "$i" = "$(echo "$i" | tr -d /)" ]; then
uci -q del_list dhcp."$cfg".server="$i"
fi
done
}
dnsmasq_restore_server_backup() {
local cfg="$1" i
local cfg="$1"
local i
if uci -q get "dhcp.$cfg.doh_backup_server" >/dev/null; then
uci -q del "dhcp.$cfg.server"
for i in $(uci -q get "dhcp.$cfg.doh_backup_server"); do
uci -q add_list dhcp."$cfg".server="$i"
done
uci -q del "dhcp.$cfg.doh_backup_server"
fi
}
dhcp_backup() {
local i
config_load 'dhcp'
case "$1" in
create)
config_foreach dnsmasq_create_server_backup 'dnsmasq';;
if [ "$dnsmasqConfig" = "*" ]; then
config_foreach dnsmasq_create_server_backup 'dnsmasq'
elif [ -n "$dnsmasqConfig" ]; then
for i in $dnsmasqConfig; do
dnsmasq_create_server_backup "@dnsmasq[${i}]"
done
fi
;;
restore)
config_foreach dnsmasq_restore_server_backup 'dnsmasq';;
config_foreach dnsmasq_restore_server_backup 'dnsmasq'
;;
esac
}