x/mobile: Calling net.InterfaceAddrs() fails on Android SDK 30

[halseth]

What version of Go are you using (go version)?

$ go version
go version go1.14.6 darwin/amd64

$gomobile version
gomobile version +973feb4 Sat Aug 1 11:21:45 2020 +0000 (android,ios); androidSDK=/sdk/platforms/android-30

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/user/Library/Caches/go-build"
GOENV="/Users/user/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/user/golang"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.14.6/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.14.6/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/user/golang/src/golang.org/x/mobile/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/kq/3436m_v11sg0l7zqtmv2r1gw0000gn/T/go-build713467523=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Calling net.InterfaceAddrs() fails on Android app targetting SDK version 30. With build.gradle looking like:

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.0"
    defaultConfig {
        applicationId "com.example.testapp"
        minSdkVersion 29
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

Building the exact same app targetting SDK 29 works, and returns no error:

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.0"
    defaultConfig {
        applicationId "com.example.testapp"
        minSdkVersion 29
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

What did you expect to see?

Targetting SDK 30 would behave no differently.

What did you see instead?

Calling net.InterfaceAddrs() results in error route ip+net: netlinkrib: permission denied when embedded in Android app targetting SDK 30 (R):

2020-08-04 15:10:21.386 15754-15754/? W/Thread-2: type=1400 audit(0.0:616): avc: denied { bind } for scontext=u:r:untrusted_app:s0:c158,c256,c512,c768 tcontext=u:r:untrusted_app:s0:c158,c256,c512,c768 tclass=netlink_route_socket permissive=0 b/155595000 app=com.example.testapp

[toothrot]

/cc @hyangah

[hsjoberg]

Any more updates on this one? Android 11 was released today.

[vikulin]

Reproduced in Yggdrasil project for net.Interfaces():
https://github.com/yggdrasil-network/yggdrasil-go/blob/master/src/multicast/multicast.go#L192

[vikulin]

Any updates?

[rschulman]

I'd also love an update, if possible. This is blocking a project of mine right now.

[halseth]

Anybody looking into this?

[bt90]

Seems to be caused by these new restrictions in Android 11:

The following is a list of the ways that apps are affected by this change:

• NetworkInterface.getHardwareAddress() returns null for every interface.
• Apps cannot use the bind() function on NETLINK_ROUTE sockets.
• The ip command does not return information about interfaces.
• Apps cannot send RTM_GETLINK messages.

https://developer.android.com/training/articles/user-data-ids#mac-11-plus