add native tunnel module

settings.gradle

@@ -17,5 +17,6 @@ dependencyResolutionManagement {
     }
 }
 
+include ':tunnel'
 include ':app'
 

ziti-native-tunnel/build.gradle.kts

@@ -0,0 +1,68 @@
+plugins {
+    id("com.android.library")
+    id("org.jetbrains.kotlin.android")
+}
+
+android {
+    namespace = "org.openziti.tunnel"
+    compileSdk = 34
+
+    defaultConfig {
+        minSdk = 29
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles("consumer-rules.pro")
+        externalNativeBuild {
+            cmake {
+                cppFlags("")
+            }
+        }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path("src/main/cpp/CMakeLists.txt")
+            version = "3.22.1"
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+
+dependencies {
+
+    implementation(libs.core.ktx)
+    implementation(libs.appcompat)
+    implementation(libs.material)
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.ext.junit)
+    androidTestImplementation(libs.espresso.core)
+}
+
+val presets = listOf("arm-android", "arm64-android", "x64-android", "x86-android")
+
+val buildNative = tasks.register("build-native-dependencies") {}
+
+tasks.named("preBuild").dependsOn(buildNative)
+
+presets.forEach { triplet ->
+    val task = tasks.register<Exec>("build-native-deps-${triplet}") {
+        commandLine("cmake", "--preset", triplet)
+    }
+
+    buildNative.dependsOn(task)
+}

ziti-native-tunnel/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

ziti-native-tunnel/src/androidTest/java/org/openziti/tunnel/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package org.openziti.tunnel
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("org.openziti.tunnel.test", appContext.packageName)
+    }
+}

ziti-native-tunnel/src/main/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

ziti-native-tunnel/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,37 @@
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html.
+# For more examples on how to use CMake, see https://github.com/android/ndk-samples.
+
+# Sets the minimum CMake version required for this project.
+cmake_minimum_required(VERSION 3.22.1)
+
+# Declares the project name. The project name can be accessed via ${ PROJECT_NAME},
+# Since this is the top level CMakeLists.txt, the project name is also accessible
+# with ${CMAKE_PROJECT_NAME} (both CMake variables are in-sync within the top level
+# build script scope).
+project("tunnel")
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+#
+# In this top level CMakeLists.txt, ${CMAKE_PROJECT_NAME} is used to define
+# the target library name; in the sub-module's CMakeLists.txt, ${PROJECT_NAME}
+# is preferred for the same purpose.
+#
+# In order to load a library into your app from Java/Kotlin, you must call
+# System.loadLibrary() and pass the name of the library defined here;
+# for GameActivity/NativeActivity derived applications, the same library name must be
+# used in the AndroidManifest.xml file.
+add_library(${CMAKE_PROJECT_NAME} SHARED
+        # List C/C++ source files with relative paths to this CMakeLists.txt.
+        tunnel.cpp)
+
+# Specifies libraries CMake should link to your target library. You
+# can link libraries from various origins, such as libraries defined in this
+# build script, prebuilt third-party libraries, or Android system libraries.
+target_link_libraries(${CMAKE_PROJECT_NAME}
+        # List libraries link to the target library
+        android
+        log)

ziti-native-tunnel/src/main/cpp/tunnel.cpp

@@ -0,0 +1,10 @@
+#include <jni.h>
+#include <string>
+
+extern "C" JNIEXPORT jstring JNICALL
+Java_org_openziti_tunnel_NativeLib_stringFromJNI(
+        JNIEnv* env,
+        jobject /* this */) {
+    std::string hello = "Hello from C++";
+    return env->NewStringUTF(hello.c_str());
+}

ziti-native-tunnel/src/main/java/org/openziti/tunnel/NativeLib.kt

@@ -0,0 +1,17 @@
+package org.openziti.tunnel
+
+class NativeLib {
+
+    /**
+     * A native method that is implemented by the 'tunnel' native library,
+     * which is packaged with this application.
+     */
+    external fun stringFromJNI(): String
+
+    companion object {
+        // Used to load the 'tunnel' library on application startup.
+        init {
+            System.loadLibrary("tunnel")
+        }
+    }
+}

ziti-native-tunnel/src/test/java/org/openziti/tunnel/ExampleUnitTest.kt

@@ -0,0 +1,17 @@
+package org.openziti.tunnel
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}