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/*
* Copyright (C) 2019 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.
*/
#define LOG_TAG "nativeloader"
#include "native_loader_namespace.h"
#include <dlfcn.h>
#include <functional>
#include <android-base/strings.h>
#include <log/log.h>
#include <nativebridge/native_bridge.h>
#include "nativeloader/dlext_namespaces.h"
namespace android {
namespace {
constexpr const char* kDefaultNamespaceName = "default";
constexpr const char* kPlatformNamespaceName = "platform";
} // namespace
NativeLoaderNamespace NativeLoaderNamespace::GetExportedNamespace(const std::string& name,
bool is_bridged) {
if (!is_bridged) {
return NativeLoaderNamespace(name, android_get_exported_namespace(name.c_str()));
} else {
return NativeLoaderNamespace(name, NativeBridgeGetExportedNamespace(name.c_str()));
}
}
char* NativeLoaderNamespace::GetError() const {
if (!IsBridged()) {
return strdup(dlerror());
} else {
return strdup(NativeBridgeGetError());
}
}
// The platform namespace is called "default" for binaries in /system and
// "platform" for those in the Runtime APEX. Try "platform" first since
// "default" always exists.
NativeLoaderNamespace NativeLoaderNamespace::GetPlatformNamespace(bool is_bridged) {
NativeLoaderNamespace ns = GetExportedNamespace(kPlatformNamespaceName, is_bridged);
if (ns.IsNil()) {
ns = GetExportedNamespace(kDefaultNamespaceName, is_bridged);
}
return ns;
}
NativeLoaderNamespace NativeLoaderNamespace::Create(const std::string& name,
const std::string& search_paths,
const std::string& permitted_paths,
const NativeLoaderNamespace* parent,
bool is_shared, bool is_greylist_enabled) {
bool is_bridged = false;
if (parent != nullptr) {
is_bridged = parent->IsBridged();
} else if (!search_paths.empty()) {
is_bridged = NativeBridgeIsPathSupported(search_paths.c_str());
}
// Fall back to the platform namespace if no parent is set.
const NativeLoaderNamespace& effective_parent =
parent != nullptr ? *parent : GetPlatformNamespace(is_bridged);
uint64_t type = ANDROID_NAMESPACE_TYPE_ISOLATED;
if (is_shared) {
type |= ANDROID_NAMESPACE_TYPE_SHARED;
}
if (is_greylist_enabled) {
type |= ANDROID_NAMESPACE_TYPE_GREYLIST_ENABLED;
}
if (!is_bridged) {
android_namespace_t* raw =
android_create_namespace(name.c_str(), nullptr, search_paths.c_str(), type,
permitted_paths.c_str(), effective_parent.ToRawAndroidNamespace());
return NativeLoaderNamespace(name, raw);
} else {
native_bridge_namespace_t* raw = NativeBridgeCreateNamespace(
name.c_str(), nullptr, search_paths.c_str(), type, permitted_paths.c_str(),
effective_parent.ToRawNativeBridgeNamespace());
return NativeLoaderNamespace(name, raw);
}
}
bool NativeLoaderNamespace::Link(const NativeLoaderNamespace& target,
const std::string& shared_libs) const {
LOG_ALWAYS_FATAL_IF(shared_libs.empty(), "empty share lib when linking %s to %s",
this->name().c_str(), target.name().c_str());
if (!IsBridged()) {
return android_link_namespaces(this->ToRawAndroidNamespace(), target.ToRawAndroidNamespace(),
shared_libs.c_str());
} else {
return NativeBridgeLinkNamespaces(this->ToRawNativeBridgeNamespace(),
target.ToRawNativeBridgeNamespace(), shared_libs.c_str());
}
}
void* NativeLoaderNamespace::Load(const char* lib_name) const {
if (!IsBridged()) {
android_dlextinfo extinfo;
extinfo.flags = ANDROID_DLEXT_USE_NAMESPACE;
extinfo.library_namespace = this->ToRawAndroidNamespace();
return android_dlopen_ext(lib_name, RTLD_NOW, &extinfo);
} else {
return NativeBridgeLoadLibraryExt(lib_name, RTLD_NOW, this->ToRawNativeBridgeNamespace());
}
}
} // namespace android
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