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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nativeloader/native_loader.h"
#include "ScopedUtfChars.h"
#include <dlfcn.h>
#ifdef __ANDROID__
#include <android/dlext.h>
#include "cutils/properties.h"
#endif
#include <algorithm>
#include <vector>
#include <string>
#include <mutex>
#include "android-base/macros.h"
#include "android-base/strings.h"
namespace android {
#ifdef __ANDROID__
// TODO(dimitry): move this to system properties.
static const char* kPublicNativeLibraries = "libandroid.so:"
"libc.so:"
"libdl.so:"
"libEGL.so:"
"libGLESv1_CM.so:"
"libGLESv2.so:"
"libGLESv3.so:"
"libjnigraphics.so:"
"liblog.so:"
"libmediandk.so:"
"libm.so:"
"libOpenMAXAL.so:"
"libOpenSLES.so:"
"libRS.so:"
"libstdc++.so:"
"libwebviewchromium_plat_support.so:"
"libz.so";
class LibraryNamespaces {
public:
LibraryNamespaces() : initialized_(false) { }
android_namespace_t* GetOrCreate(JNIEnv* env, jobject class_loader,
bool is_shared,
jstring java_library_path,
jstring java_permitted_path) {
ScopedUtfChars library_path(env, java_library_path);
std::string permitted_path;
if (java_permitted_path != nullptr) {
ScopedUtfChars path(env, java_permitted_path);
permitted_path = path.c_str();
}
if (!initialized_ && !InitPublicNamespace(library_path.c_str())) {
return nullptr;
}
std::lock_guard<std::mutex> guard(mutex_);
auto it = FindNamespaceByClassLoader(env, class_loader);
if (it != namespaces_.end()) {
return it->second;
}
uint64_t namespace_type = ANDROID_NAMESPACE_TYPE_ISOLATED;
if (is_shared) {
namespace_type |= ANDROID_NAMESPACE_TYPE_SHARED;
}
android_namespace_t* ns =
android_create_namespace("classloader-namespace",
nullptr,
library_path.c_str(),
namespace_type,
java_permitted_path != nullptr ?
permitted_path.c_str() :
nullptr);
namespaces_.push_back(std::make_pair(env->NewWeakGlobalRef(class_loader), ns));
return ns;
}
private:
bool InitPublicNamespace(const char* library_path) {
// Make sure all the public libraries are loaded
std::vector<std::string> sonames = android::base::Split(kPublicNativeLibraries, ":");
for (const auto& soname : sonames) {
if (dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE) == nullptr) {
return false;
}
}
// Some apps call dlopen from generated code unknown to linker in which
// case linker uses anonymous namespace. See b/25844435 for details.
initialized_ = android_init_namespaces(kPublicNativeLibraries, library_path);
return initialized_;
}
std::vector<std::pair<jweak, android_namespace_t*>>::const_iterator
FindNamespaceByClassLoader(JNIEnv* env, jobject class_loader) {
return std::find_if(namespaces_.begin(), namespaces_.end(),
[&](const std::pair<jweak, android_namespace_t*>& value) {
return env->IsSameObject(value.first, class_loader);
});
}
bool initialized_;
std::mutex mutex_;
std::vector<std::pair<jweak, android_namespace_t*>> namespaces_;
DISALLOW_COPY_AND_ASSIGN(LibraryNamespaces);
};
static LibraryNamespaces* g_namespaces = new LibraryNamespaces;
#endif
void* OpenNativeLibrary(JNIEnv* env, int32_t target_sdk_version, const char* path,
jobject class_loader, bool is_shared, jstring java_library_path,
jstring java_permitted_path) {
#if defined(__ANDROID__)
if (target_sdk_version == 0 || class_loader == nullptr) {
return dlopen(path, RTLD_NOW);
}
android_namespace_t* ns =
g_namespaces->GetOrCreate(env, class_loader, is_shared,
java_library_path, java_permitted_path);
if (ns == nullptr) {
return nullptr;
}
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = ns;
return android_dlopen_ext(path, RTLD_NOW, &extinfo);
#else
UNUSED(env, target_sdk_version, class_loader, is_shared,
java_library_path, java_permitted_path);
return dlopen(path, RTLD_NOW);
#endif
}
}; // android namespace
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