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87 lines
2.5 KiB
87 lines
2.5 KiB
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <jni.h>
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#include <jvmti.h>
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#include <string_view>
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namespace ddms_agent {
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using DisablePolicy = jvmtiError (*)(jvmtiEnv*);
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static constexpr std::string_view kDisablePolicyName =
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"com.android.art.misc.disable_hidden_api_enforcement_policy";
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static jvmtiEnv* jvmti_env;
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DisablePolicy disable_ext;
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template <typename T>
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static void Dealloc(T* t) {
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jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(t));
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}
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template <typename T, typename... Rest>
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static void Dealloc(T* t, Rest... rs) {
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Dealloc(t);
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Dealloc(rs...);
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}
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static void DeallocParams(jvmtiParamInfo* params, jint n_params) {
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for (jint i = 0; i < n_params; i++) {
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Dealloc(params[i].name);
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}
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}
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void* GetExtension(const std::string_view& name) {
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// Get the extensions.
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jint n_ext = 0;
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void* result = nullptr;
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jvmtiExtensionFunctionInfo* infos = nullptr;
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if (jvmti_env->GetExtensionFunctions(&n_ext, &infos) != JVMTI_ERROR_NONE) {
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return nullptr;
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}
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for (jint i = 0; i < n_ext; i++) {
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jvmtiExtensionFunctionInfo* cur_info = &infos[i];
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if (name == std::string_view(cur_info->id)) {
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result = reinterpret_cast<void*>(cur_info->func);
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}
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// Cleanup the cur_info
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DeallocParams(cur_info->params, cur_info->param_count);
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Dealloc(cur_info->id, cur_info->short_description, cur_info->params, cur_info->errors);
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}
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// Cleanup the array.
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Dealloc(infos);
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if (result == nullptr) {
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return nullptr;
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}
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return result;
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}
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extern "C" JNIEXPORT jint JNICALL Agent_OnAttach(JavaVM* vm, char*, void*) {
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vm->GetEnv(reinterpret_cast<void**>(&jvmti_env), JVMTI_VERSION_1_0);
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disable_ext = reinterpret_cast<DisablePolicy>(GetExtension(kDisablePolicyName));
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if (disable_ext == nullptr) {
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return JNI_ERR;
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}
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return JNI_OK;
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}
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extern "C" JNIEXPORT jint JNICALL
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Java_android_jdwptunnel_sampleapp_ddms_DdmsSampleDeviceActivity_ForceNoHiddenapi(JNIEnv*, jclass) {
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return disable_ext(jvmti_env);
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}
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} // namespace ddms_agent
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