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Zoltan Papp
be8ec8e802
* Keep the tunnel resolver when Private DNS is in Automatic mode The tunnel builder left the NetBird resolver out of the VPN whenever Android reported Private DNS as active. That flag is also true in Automatic mode on any network whose own resolver speaks TLS, which on many carriers and some home networks is the default state. NetBird names and custom DNS zones then stopped resolving with no visible reason, and whether they worked at all depended on the network the phone was on at the moment the tunnel was last rebuilt. Only a configured Private DNS hostname actually conflicts with a plain resolver in the tunnel: the OS then sends every query over TLS to that host and refuses plain DNS, so offering our resolver would make every lookup fail. In Automatic mode the OS probes a resolver for TLS and falls back to plain DNS when the probe fails, and with Private DNS off it never asks. In both cases the tunnel resolver works. Decide on the hostname instead. DNSWatch now reads the Private DNS server name next to the active flag, and IFace leaves the resolver out only when one is set, logging which host it yields to. The hostname setting is global, so the decision no longer depends on which network happens to be active during a rebuild. * Make the Private DNS resolver decision a testable function The previous commit switched the tunnel resolver decision from the Private DNS active flag to the configured hostname, which left the flag with no reader. Drop the field, its getter and both assignments. The decision itself now lives in a static function on DNSWatch that takes only the hostname, so it can be unit tested without a ConnectivityManager. IFace calls it directly and isPrivateDnsStrict goes away. A null or empty name keeps the resolver; a hostname leaves it out. The message logged when the resolver is left out drops from info to debug, matching the level of the line it replaced.
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NetBird Android client
The NetBird Android client allows connections from mobile devices running Android to private resources in the NetBird network.
Screenshots
Install
You can download and install the app from the Google Play Store:
Building from source
Requirements
We need the following software:
- Java 1.11. Usually comes with Android Studio
- android studio initialized with jdk and emulator (not covered here, is a req from android-client project)
- gradle (https://gradle.org/install/)
Prepare development environment
- Close all repositories:
assuming you use a path like ~/projects locally
mkdir ~/projects
cd projects
# clone netbird repo
git clone --recurse-submodules git@github.com:netbirdio/android-client.git
- Checkout the repositories to the branches you want to test. If you want the latest, check the status information on your IDE or on https://github.com and verify the branch list and commit history.
- Export JDK and Android home vars, on macOS they are: (please contribute with Linux equivalent)
# replace <USERNAME> with your name
export ANDROID_HOME=/Users/<USERNAME>/Library/Android/sdk
export JAVA_HOME=/Applications/Android Studio.app/Contents/jbr/Contents/Home
- Install NDK and CMake
cd ~/projects/android-client
$ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --install "ndk;23.1.7779620"
Generate debug bundle
Follow the steps to run locally until the step 5 then run the following steps:
- Build Go agent library
cd ~/projects/android-client
./build-android-lib.sh
- Run gradlew
cd ~/projects/android-client/android
./gradlew bundleDebug -PversionCode=123 -PversionName=1.2.3