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AdGuardDNS/doc/development.md
Andrey Meshkov b6e37914aa Sync v2.6.0
2024-03-11 12:21:07 +03:00

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AdGuard DNS Development Setup

Contents

Initial setup

Development is supported on Linux and macOS (aka Darwin) systems.

  1. Install Go 1.21 or later.

  2. Call make init to set up the Git pre-commit hook.

  3. Call make go-tools to install analyzers and other tools into the bin directory.

Common Makefile macros and targets

Most development tasks are done through the use of our Makefile. Please keep the Makefile POSIX-compliant and portable.

Macros

This is not an extensive list. See ../Makefile and the scripts in the ../scripts/make/ directory.

OUT
The name of the binary to build. Default: ./AdGuardDNS.
RACE
Set to 1 to enable the race detector. The race detector is always enabled for make go-test.
VERBOSE
Set to 1 to enable verbose mode. Default: 0.

Targets

This is not an extensive list. See ../Makefile.

make init
Set up the pre-commit hook that runs checks, linters, and tests.
make go-build
Build the binary. See also the OUT and RACE macros.
make go-gen

Regenerate the automatically generated Go files that need to be periodically updated. Those generated files are:

  • ../internal/geoip/country_generate.go;
  • ../internal/geoip/asntops_generate.go;
  • ../internal/ecscache/ecsblockilist_generate.go;
  • ../internal/profiledb/internal/filecachepb/filecache.pb.go.

You'll need to install protoc for the last one.

make go-lint
Run Go checkers and static analysis.
make go-test
Run Go tests.
make go-bench
Run Go benchmarks.
make go-tools
Install the Go static analysis tools locally.
make test
Currently does the same thing as make go-test but is defined both because it's a common target and also in case code in another language appears in the future.
make txt-lint
Run plain text checkers.

How to run AdGuard DNS

This is an example on how to run AdGuard DNS locally.

Step 1: prepare the TLS certificate and the key

Keeping the test files in the test directory since it's added to .gitignore:

mkdir test
cd test

Generate the TLS certificate and the key:

openssl req -nodes -new -x509 -keyout cert.key -out cert.crt

Also, generate TLS session tickets:

openssl rand 32 > ./tls_key_1
openssl rand 32 > ./tls_key_2

Step 2: prepare the DNSCrypt configuration

Install the dnscrypt tool:

  • On macOS, install from Brew:

    brew install ameshkov/tap/dnscrypt

  • On other unixes, such as Linux, download and install the latest release manually.

Then, generate the configuration:

dnscrypt generate -p testdns -o ./dnscrypt.yml

Step 3: prepare the configuration file

cd ../
cp -f config.dist.yaml config.yaml

Step 4: prepare the test data

echo '<html><body>Dangerous content ahead</body></html>' > ./test/block_page_sb.html
echo '<html><body>Adult content ahead</body></html>' > ./test/block_page_adult.html
echo '<html><body>Error 404</body></html>' > ./test/error_404.html
echo '<html><body>Error 500</body></html>' > ./test/error_500.html

Step 5: compile AdGuard DNS

make build

Step 6: prepare cache data and GeoIP

We'll use the test versions of the GeoIP databases here.

rm -f -r ./test/cache/
mkdir ./test/cache
curl 'https://raw.githubusercontent.com/maxmind/MaxMind-DB/main/test-data/GeoIP2-Country-Test.mmdb' -o ./test/GeoIP2-Country-Test.mmdb
curl 'https://raw.githubusercontent.com/maxmind/MaxMind-DB/main/test-data/GeoIP2-City-Test.mmdb' -o ./test/GeoIP2-City-Test.mmdb
curl 'https://raw.githubusercontent.com/maxmind/MaxMind-DB/main/test-data/GeoIP2-ISP-Test.mmdb' -o ./test/GeoIP2-ISP-Test.mmdb

Step 7: run AdGuard DNS

You'll need to supply the following:

See the external HTTP API documentation.

You may use go run ./scripts/backend to start mock GRPC server for BILLSTAT_URL and PROFILES_URL endpoints.

You may need to change the listen ports in config.yaml which are less than 1024 to some other ports. Otherwise, sudo or doas is required to run AdGuardDNS.

Examples below are for the configuration with the following changes:

  • Plain DNS: 53 → 5354
  • DoT: 853 → 8853
  • DoH: 443 → 8443
  • DoQ: 853 → 8853

You may also need to remove probe_ipv6 if your network does not support IPv6.

If you're using an OS different from Linux, you also need to make these changes:

  • Remove the interface_listeners section.
  • Remove bind_interfaces from the default_dns server configuration and replace it with bind_addresses.
env \
    ADULT_BLOCKING_URL='https://raw.githubusercontent.com/ameshkov/stuff/master/DNS/adult_blocking.txt' \
    BILLSTAT_URL='grpc://localhost:6062' \
    BLOCKED_SERVICE_INDEX_URL='https://adguardteam.github.io/HostlistsRegistry/assets/services.json' \
    CONSUL_ALLOWLIST_URL='https://raw.githubusercontent.com/ameshkov/stuff/master/DNS/consul_allowlist.json' \
    CONFIG_PATH='./config.yaml' \
    FILTER_INDEX_URL='https://adguardteam.github.io/HostlistsRegistry/assets/filters.json' \
    FILTER_CACHE_PATH='./test/cache' \
    NEW_REG_DOMAINS_URL='https://raw.githubusercontent.com/ameshkov/stuff/master/DNS/nrd.txt' \
    PROFILES_CACHE_PATH='./test/profilecache.pb' \
    PROFILES_URL='grpc://localhost:6062' \
    SAFE_BROWSING_URL='https://raw.githubusercontent.com/ameshkov/stuff/master/DNS/safe_browsing.txt' \
    GENERAL_SAFE_SEARCH_URL='https://adguardteam.github.io/HostlistsRegistry/assets/engines_safe_search.txt' \
    GEOIP_ASN_PATH='./test/GeoIP2-ISP-Test.mmdb' \
    GEOIP_COUNTRY_PATH='./test/GeoIP2-City-Test.mmdb' \
    QUERYLOG_PATH='./test/cache/querylog.jsonl' \
    LINKED_IP_TARGET_URL='https://httpbin.agrd.workers.dev/anything' \
    LISTEN_ADDR='127.0.0.1' \
    LISTEN_PORT='8081' \
    RULESTAT_URL='https://httpbin.agrd.workers.dev/post' \
    SENTRY_DSN='https://1:1@localhost/1' \
    VERBOSE='1' \
    YOUTUBE_SAFE_SEARCH_URL='https://adguardteam.github.io/HostlistsRegistry/assets/youtube_safe_search.txt' \
    ./AdGuardDNS

Step 8: test your instance

Plain DNS:

dnslookup example.org 127.0.0.1:5354

DoT:

VERIFY=0 dnslookup example.org tls://127.0.0.1:8853

DoH:

VERIFY=0 dnslookup example.org https://127.0.0.1:8443/dns-query

DoQ:

VERIFY=0 dnslookup example.org quic://127.0.0.1:8853

Open http://127.0.0.1:8081/metrics to see the server's metrics.

DNSCrypt is a bit trickier. You need to open dnscrypt.yml and use values from there to generate an SDNS stamp on https://dnscrypt.info/stamps.

Note

The example below is for a test configuration that won't work for you.

dnslookup example.org sdns://AQcAAAAAAAAADjEyNy4wLjAuMTo1NDQzIAbKgP3dmXybr1DaKIFgKjsc8zSFX4rgT_hFgymSq6w1FzIuZG5zY3J5cHQtY2VydC50ZXN0ZG5z

Testing

The go-bench and go-test targets described earlier should generally be enough, but there are cases where additional testing setup is required. One such case is package bindtodevice.

Testing SO_BINDTODEVICE features

The SO_BINDTODEVICE features require a Linux machine with a particular IP routing set up. In order to test these features on architectures other than Linux, this repository has a Dockerfile and a convenient script to use it, see scripts/test/bindtodevice.sh.

A simple example:

  • If your Docker is installed in a way that doesn't require sudo to use it:

    sh ./scripts/test/bindtodevice.sh

  • Otherwise:

    env USE_SUDO=1 sh ./scripts/test/bindtodevice.sh

This will build the image and open a shell within the container. The container environment is defined by scripts/test/bindtodevice.docker, and has all utilities required to build the AdGuardDNS binary and test it. The working directory is also shared with the container through the /test directory inside it. The container also routes all IP connections to any address in the 172.17.0.0/16 subnet to the eth0 network interface. So, calling make go-test or a similar command from within the container will actually test the SO_BINDTODEVICE features:

go test --cover -v ./internal/bindtodevice/

If you want to open an additional terminal (for example to launch AdGuardDNS in one and dig it in the other), use docker exec like this (you may need sudo for that):

docker exec -i -t agdns_bindtodevice_test /bin/sh