default method hook example

Author: AleksRychkov

examples/android-gradle-kts/build.gradle.kts

@@ -46,8 +46,10 @@ androidMethodHook {
     configs {
         create("debug") {
             addConfig("./methodhook/descriptor.conf")
-            addConfig("./methodhook/okhttp.conf")
+            addConfig("./methodhook/default.conf")
             addConfig("./methodhook/auto_trace.conf")
+
+            addConfig("./methodhook/okhttp.conf")
             addConfig("./methodhook/frame_counter.conf")
         }
     }

examples/android-gradle-kts/methodhook/default.conf

@@ -0,0 +1,10 @@
+descriptorFoo {
+    type = "default"
+    package = "io.github.aleksrychkov.example.sandbox"
+    superClass = "*"
+    interfaces = []
+    class = "io.github.aleksrychkov.example.sandbox.DefaultPlayground"
+    methods = [ "test" ]
+    enter = "io.github.aleksrychkov.methodhook.DefaultHook.enter"
+    exit = "io.github.aleksrychkov.methodhook.DefaultHook.exit"
+}

examples/android-gradle-kts/src/main/kotlin/io/github/aleksrychkov/example/MainActivity.kt

@@ -1,6 +1,7 @@
 package io.github.aleksrychkov.example
 
 import android.os.Bundle
+import io.github.aleksrychkov.example.sandbox.DefaultPlayground
 import io.github.aleksrychkov.example.sandbox.DescriptorPlayground
 import io.github.aleksrychkov.example.sandbox.OkhttpPlayground
 import io.github.aleksrychkov.example.sandbox.Playground
@@ -10,7 +11,8 @@ class MainActivity : AbstractActivity(), AutoTrace {
 
     private val sandbox: List<Playground> = listOf(
         DescriptorPlayground(),
-        OkhttpPlayground()
+        OkhttpPlayground(),
+        DefaultPlayground(),
     )
 
     override fun onCreate(savedInstanceState: Bundle?) {

examples/android-gradle-kts/src/main/kotlin/io/github/aleksrychkov/example/sandbox/DefaultPlayground.kt

@@ -0,0 +1,5 @@
+package io.github.aleksrychkov.example.sandbox
+
+class DefaultPlayground : Playground {
+    override fun test() {}
+}

examples/android-gradle-kts/src/main/kotlin/io/github/aleksrychkov/methodhook/DefaultHook.kt

@@ -0,0 +1,15 @@
+package io.github.aleksrychkov.methodhook
+
+@Suppress("unused")
+object DefaultHook {
+
+    @JvmStatic
+    fun enter(clazz: String, method: String, descriptor: String) {
+        println("DefaultHook::enter::$clazz.$method.$descriptor")
+    }
+
+    @JvmStatic
+    fun exit(clazz: String, method: String, descriptor: String) {
+        println("DefaultHook::exit::$clazz.$method.$descriptor")
+    }
+}

methodhook/src/main/kotlin/io/github/aleksrychkov/methodhook/injects/injectors/DefaultInjector.kt

@@ -27,7 +27,7 @@ internal class DefaultInjector(
     override fun onEnter(context: InjectorContext, mv: MethodVisitor) = with(mv) {
         if (enterInjectMethod == null) return@with
 
-        visitLdcInsn(context.className)
+        visitLdcInsn(context.className.replace("/", "."))
         visitLdcInsn(context.methodName)
         visitLdcInsn(context.methodDescriptor)
 
@@ -48,7 +48,7 @@ internal class DefaultInjector(
     ) = with(mv) {
         if (exitInjectMethod == null) return@with
 
-        visitLdcInsn(context.className)
+        visitLdcInsn(context.className.replace("/", "."))
         visitLdcInsn(context.methodName)
         visitLdcInsn(context.methodDescriptor)