[release/6.0] [Android] Port getifaddrs implementation from Xamarin.Android

[github-actions]

Backport of #71943 to release/6.0

/cc @simonrozsival

Customer Impact

In recent Android versions the data returned by the getifaddrs function is invalid and doesn't allow us to implement System.Net.NetworkInformation.GetAllNetworkInterfaces() correctly. The problem was originally reported in the MAUI repo (dotnet/maui#6649, dotnet/android#6973).

Testing

There are existing unit tests for the System.Net.NetworkInformation project.

Risk

Low. The code is a port of an existing implementation in legacy Xamarin.Android (https://github.com/xamarin/xamarin-android/blob/f149c25c7e5936fad73ddf80b588ca67bbacc24a/src/monodroid/jni/xamarin_getifaddrs.cc).

IMPORTANT: If this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.

[ghost]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[simonrozsival]

/azp run runtime-extra-platforms

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[simonrozsival]

The runtime-staging lanes contain several failures but all of them are unrelated to the change.

[ghost]

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

Issue Details

---

Backport of #71943 to release/6.0

/cc @simonrozsival

Customer Impact

In recent Android versions the data returned by the getifaddrs function is invalid and doesn't allow us to implement System.Net.NetworkInformation.GetAllNetworkInterfaces() correctly. The problem was originally reported in the MAUI repo (dotnet/maui#6649, dotnet/android#6973).

Testing

There are existing unit tests for the System.Net.NetworkInformation project.

Risk

Low. The code is a port of an existing implementation in legacy Xamarin.Android (https://github.com/xamarin/xamarin-android/blob/f149c25c7e5936fad73ddf80b588ca67bbacc24a/src/monodroid/jni/xamarin_getifaddrs.cc).

IMPORTANT: If this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.

Author:	github-actions[bot]
Assignees:	-
Labels:	Servicing-consider, area-System.Net
Milestone:	6.0.x

[ghost]

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

Issue Details

---

Backport of #71943 to release/6.0

/cc @simonrozsival

Customer Impact

In recent Android versions the data returned by the getifaddrs function is invalid and doesn't allow us to implement System.Net.NetworkInformation.GetAllNetworkInterfaces() correctly. The problem was originally reported in the MAUI repo (dotnet/maui#6649, dotnet/android#6973).

Testing

There are existing unit tests for the System.Net.NetworkInformation project.

Risk

Low. The code is a port of an existing implementation in legacy Xamarin.Android (https://github.com/xamarin/xamarin-android/blob/f149c25c7e5936fad73ddf80b588ca67bbacc24a/src/monodroid/jni/xamarin_getifaddrs.cc).

IMPORTANT: If this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.

Author:	github-actions[bot]
Assignees:	-
Labels:	Servicing-consider, area-System.Net, os-android
Milestone:	6.0.x

[carlossanlop]

I'm rerunning one of the CI legs because there was a one CoreCLR failure, but the logs were gone.

@marek-safar @steveisok @akoeplinger who can sign-off on this change, and potentially investigate any CI failures if they show up again?

Edit: Ah nevermind, this change is for Android, the failure is arm64 windows. We're good.

[carlossanlop]

Tactics approved.
Correct milestone applied.
CI failure is unrelated.
No OOB package authoring changes needed (native code only).
Signed off by area owner.
Ready to merge.