[Android] NetworkInterface.GetAllNetworkInterfaces failed with NetworkInformationException (message: Success)

[8212369]

Description

On Android 11 release build, I was encountering System.Net.NetworkInformation.NetworkInformationException when called System.Net.NetworkInformation.NetworkInterface。GetAllNetworkInterfaces, and the error string is just success. I have added two permissions: INTERNET and ACCESS_NETWORK_STATE to which no avail. I think it's worth mentioning.

I saw a log category named DOTNET_LINK so I reported the issue here.

Reproduction Steps

Using System.Net namespace, call NetworkInterface.GetAllNetworkInterfaces

Expected behavior

The function completes with no exception

Actual behavior

The function throws System.Net.NetworkInformationException

Regression?

No response

Known Workarounds

No response

Configuration

.NET 6.0.9

Other information

I skimmed through the PRs and there was a change to exclusively use the Xamarin's implementation of getifaddrs recently. But on Android 11 Google blocked NETLINK_ROUTE family socket from being bind.

This is also the log that I was getting from adb

I think it's correspond to this. I hope I'm right.

One small note, I think this quirk is per vendor distribution, as my Xiaomi phone does not seems have this problem.

Related issues about this blocking .

Tagging subscribers to this area: @dotnet/ncl
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

On Android 11 release build, I was encountering System.Net.NetworkInformation.NetworkInformationException when called System.Net.NetworkInterface.NetworkInformation.GetAllNetworkInterfaces, and the error string is just success. I have added two permissions: INTERNET and ACCESS_NETWORK_STATE to which no avail. I think it's worth mentioning.

I saw a log category named DOTNET_LINK so I reported the issue here.

Reproduction Steps

Using System.Net namespace, call NetworkInterface.GetAllNetworkInterfaces

Expected behavior

The function completes with no exception

Actual behavior

The function throws System.Net.NetworkInformationException

Regression?

No response

Known Workarounds

No response

Configuration

.NET 6.0.9

Other information

I skimmed through the PRs and there was a change to exclusively use the Xamarin's implementation of getifaddrs recently. But on Android 11 Google blocked NETLINK_ROUTE family socket from being bind.

This is also the log that I was getting from adb

I think it's correspond to this. I hope I'm right.

One small note, I think this quirk is per vendor distribution, as my Xiaomi phone does not seems have this problem.

Related issues about this blocking .

Author:	8212369
Assignees:	-
Labels:	area-System.Net, untriaged
Milestone:	-

[danmoseley]

Thanks - could you paste in the stacks/messages as regular text? You can use triple back tick above and below for formatting. This makes it possible for search to find them

Tagging subscribers to 'arch-android': @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

On Android 11 release build, I was encountering System.Net.NetworkInformation.NetworkInformationException when called System.Net.NetworkInformation.NetworkInterface。GetAllNetworkInterfaces, and the error string is just success. I have added two permissions: INTERNET and ACCESS_NETWORK_STATE to which no avail. I think it's worth mentioning.

I saw a log category named DOTNET_LINK so I reported the issue here.

Reproduction Steps

Using System.Net namespace, call NetworkInterface.GetAllNetworkInterfaces

Expected behavior

The function completes with no exception

Actual behavior

The function throws System.Net.NetworkInformationException

Regression?

No response

Known Workarounds

No response

Configuration

.NET 6.0.9

Other information

I skimmed through the PRs and there was a change to exclusively use the Xamarin's implementation of getifaddrs recently. But on Android 11 Google blocked NETLINK_ROUTE family socket from being bind.

This is also the log that I was getting from adb

I think it's correspond to this. I hope I'm right.

One small note, I think this quirk is per vendor distribution, as my Xiaomi phone does not seems have this problem.

Related issues about this blocking .

Author:	8212369
Assignees:	-
Labels:	area-System.Net, os-android, untriaged
Milestone:	-

[8212369]

Here is the exception stack:

[ERROR] FATAL UNHANDLED EXCEPTION: System.Net.NetworkInformation.NetworkInformationException (0x80004005): Success
   at System.Net.NetworkInformation.NetworkInterfacePal.TransformNetworkInterfacess[AndroidNetworkInterface[]](Func`5 transform)
   at System.Net.NetworkInformation.NetworkInterfacePal.GetAndroidNetworkInterfaces()
   at System.Net.NetworkInformation.NetworkInterfacePal.GetAllNetworkInterfaces()
   at System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()
   at Microsoft.Phone.Net.NetworkInformation.NetworkInterface.get_NetworkInterfaceType()
   at TestApp.MetricsSender.CheckConnectionType()
   at System.Threading.Thread.StartCallback()

The log message I think to be related is this line. This is the only error line I found near this exception:

runtime/src/native/libs/System.Native/pal_ifaddrs.c

Line 104 in 55060eb

LOG_WARN("Failed to bind to the netlink socket. %s\n", strerror(errno));

[steveisok]

/cc @simonrozsival

[forlayo]

Another one suffering the issue here , this is what I see on logcat..

...
09-20 20:38:26.869  6067  6110 W DOTNET_NETLINK: Failed to bind to the netlink socket. Permission denied
...
09-20 20:38:26.865  6067  6067 W com.displaynote.amadeus: type=1400 audit(0.0:23150): avc: denied { bind } for comm=2E4E455420546872656164506F6F6C scontext=u:r:untrusted_app:s0:c168,c256,c512,c768 tcontext=u:r:untrusted_app:s0:c168,c256,c512,c768 tclass=netlink_route_socket permissive=0 b/155595000 app=com.displaynote.amadeus
09-20 20:38:26.889  6067  6110 E System.Net.NetworkInformation.NetworkInformationException (0x80004005): Success
09-20 20:38:26.889  6067  6110 E Amadeus.Services.Discovery.Method.CloudDiscovery:    at System.Net.NetworkInformation.NetworkInterfacePal.TransformNetworkInterfacess[AndroidNetworkInterface[]](Func`5 transform)
09-20 20:38:26.889  6067  6110 E Amadeus.Services.Discovery.Method.CloudDiscovery:    at System.Net.NetworkInformation.NetworkInterfacePal.GetAndroidNetworkInterfaces()
09-20 20:38:26.889  6067  6110 E Amadeus.Services.Discovery.Method.CloudDiscovery:    at System.Net.NetworkInformation.NetworkInterfacePal.GetAllNetworkInterfaces()
09-20 20:38:26.889  6067  6110 E Amadeus.Services.Discovery.Method.CloudDiscovery:    at System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

[simonrozsival]

I started looking into the problem and as a quick workaround it is possible to modify AndroidManifest.xml with:

<uses-sdk android:minSdkVersion="29" />

When the minSdkVersion is 29 or lower, the exception isn't thrown and a correct array of interfaces is returned (tested on a Samsung phone with Android 12). In the case when it is necessary to use 30 or newer, it is necessary to use Java.Net.NetworkInterface.NetworkInterfaces.

I'll keep working on a proper fix for this issue that will work with new SDKs.

EDIT: The targetSdkVersion needs to be 29 or lower which unfortunately makes this workaround unusable for apps uploaded to the Google Play Store (https://developer.android.com/google/play/requirements/target-sdk).

[forlayo]

If anyone is looking for a workaround, without changing minSdkVersion and as @simonrozsival is suggesting with java bindings you can do something like this:

    public IList<IPAddress> GetAllLocalValidIp4Addresses()
    {
#if ANDROID

        // This is a workaround for this issue of MAUI on Android -> https://github.com/dotnet/runtime/issues/75809 
        // Instead of using regular .net we use Java Interop bindings directly.

        var inetEnum = Java.Net.NetworkInterface.NetworkInterfaces;
        if (inetEnum is null)
        {
            return new List<IPAddress>();
        }

        var ipAddresses = new List<IPAddress>();
        foreach (var interfaces in Java.Util.Collections.List(inetEnum))
        {
            var addresses = (interfaces as Java.Net.NetworkInterface)?.InetAddresses;
            if (addresses == null)
            {
                continue;
            }

            foreach (Java.Net.InetAddress address in Java.Util.Collections.List(addresses))
            {
                if (address.HostAddress == null || address.IsLoopbackAddress || address is not Java.Net.Inet4Address)
                {
                    continue;
                }
                ipAddresses.Add(IPAddress.Parse(address.HostAddress));
            }
        }

        return ipAddresses;
#else
#pragma warning disable CS8619 // This is not going to have any null, but the compiler is not able to determine it.
        return NetworkInterface
            .GetAllNetworkInterfaces()
            .Where(n => n.OperationalStatus == OperationalStatus.Up)
            .Where(n => n.NetworkInterfaceType == NetworkInterfaceType.Wireless80211 || n.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
            .Where(n => !n.Description.ToLower().Contains("virtual"))
            .Where(n => !n.Description.ToLower().Contains("pseudo"))
            .SelectMany(n => n.GetIPProperties().UnicastAddresses)
            .Where(n => n.Address.AddressFamily == AddressFamily.InterNetwork)
            .Select(g => g?.Address)
            .Where(a => a != null) // Here I am checking to not adding anything null.
            .ToList();
#pragma warning restore CS8619
#endif
    }

Sorry @simonrozsival I didn't noticed you're a developer of the project :D

[Slm0nB]

We are struggling with this issue as well, and we looking forward to a fix. Thank you for the work around - appreciated!