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199 lines
7.7 KiB
199 lines
7.7 KiB
/*
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* Copyright (C) 2019 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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//#define LOG_NDEBUG 0
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#define LOG_TAG "MediaTranscodingService"
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#include <MediaTranscodingService.h>
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#include <android/binder_manager.h>
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#include <android/binder_process.h>
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#include <private/android_filesystem_config.h>
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#include <utils/Log.h>
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#include <utils/Vector.h>
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namespace android {
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// Convenience methods for constructing binder::Status objects for error returns
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#define STATUS_ERROR_FMT(errorCode, errorString, ...) \
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Status::fromServiceSpecificErrorWithMessage( \
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errorCode, \
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String8::format("%s:%d: " errorString, __FUNCTION__, __LINE__, ##__VA_ARGS__))
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// Can MediaTranscoding service trust the caller based on the calling UID?
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// TODO(hkuang): Add MediaProvider's UID.
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static bool isTrustedCallingUid(uid_t uid) {
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switch (uid) {
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case AID_ROOT: // root user
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case AID_SYSTEM:
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case AID_SHELL:
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case AID_MEDIA: // mediaserver
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return true;
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default:
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return false;
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}
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}
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MediaTranscodingService::MediaTranscodingService()
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: mTranscodingClientManager(TranscodingClientManager::getInstance()) {
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ALOGV("MediaTranscodingService is created");
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}
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MediaTranscodingService::~MediaTranscodingService() {
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ALOGE("Should not be in ~MediaTranscodingService");
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}
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binder_status_t MediaTranscodingService::dump(int fd, const char** /*args*/, uint32_t /*numArgs*/) {
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String8 result;
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const size_t SIZE = 256;
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char buffer[SIZE];
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snprintf(buffer, SIZE, "MediaTranscodingService: %p\n", this);
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result.append(buffer);
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write(fd, result.string(), result.size());
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Vector<String16> args;
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mTranscodingClientManager.dumpAllClients(fd, args);
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return OK;
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}
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//static
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void MediaTranscodingService::instantiate() {
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std::shared_ptr<MediaTranscodingService> service =
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::ndk::SharedRefBase::make<MediaTranscodingService>();
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binder_status_t status =
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AServiceManager_addService(service->asBinder().get(), getServiceName());
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if (status != STATUS_OK) {
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return;
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}
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}
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Status MediaTranscodingService::registerClient(
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const std::shared_ptr<ITranscodingServiceClient>& in_client,
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const std::string& in_opPackageName, int32_t in_clientUid, int32_t in_clientPid,
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int32_t* _aidl_return) {
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if (in_client == nullptr) {
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ALOGE("Client can not be null");
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*_aidl_return = kInvalidJobId;
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return Status::fromServiceSpecificError(ERROR_ILLEGAL_ARGUMENT);
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}
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int32_t callingPid = AIBinder_getCallingPid();
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int32_t callingUid = AIBinder_getCallingUid();
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// Check if we can trust clientUid. Only privilege caller could forward the uid on app client's behalf.
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if (in_clientUid == USE_CALLING_UID) {
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in_clientUid = callingUid;
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} else if (!isTrustedCallingUid(callingUid)) {
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ALOGE("MediaTranscodingService::registerClient failed (calling PID %d, calling UID %d) "
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"rejected "
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"(don't trust clientUid %d)",
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in_clientPid, in_clientUid, in_clientUid);
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return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
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"Untrusted caller (calling PID %d, UID %d) trying to "
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"register client",
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in_clientPid, in_clientUid);
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}
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// Check if we can trust clientPid. Only privilege caller could forward the pid on app client's behalf.
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if (in_clientPid == USE_CALLING_PID) {
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in_clientPid = callingPid;
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} else if (!isTrustedCallingUid(callingUid)) {
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ALOGE("MediaTranscodingService::registerClient client failed (calling PID %d, calling UID "
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"%d) rejected "
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"(don't trust clientPid %d)",
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in_clientPid, in_clientUid, in_clientPid);
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return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
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"Untrusted caller (calling PID %d, UID %d) trying to "
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"register client",
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in_clientPid, in_clientUid);
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}
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// We know the clientId must be equal to its pid as we assigned client's pid as its clientId.
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int32_t clientId = in_clientPid;
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// Checks if the client already registers.
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if (mTranscodingClientManager.isClientIdRegistered(clientId)) {
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return Status::fromServiceSpecificError(ERROR_ALREADY_EXISTS);
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}
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// Creates the client and uses its process id as client id.
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std::unique_ptr<TranscodingClientManager::ClientInfo> newClient =
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std::make_unique<TranscodingClientManager::ClientInfo>(
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in_client, clientId, in_clientPid, in_clientUid, in_opPackageName);
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status_t err = mTranscodingClientManager.addClient(std::move(newClient));
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if (err != OK) {
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*_aidl_return = kInvalidClientId;
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return STATUS_ERROR_FMT(err, "Failed to add client to TranscodingClientManager");
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}
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ALOGD("Assign client: %s pid: %d, uid: %d with id: %d", in_opPackageName.c_str(), in_clientPid,
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in_clientUid, clientId);
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*_aidl_return = clientId;
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return Status::ok();
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}
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Status MediaTranscodingService::unregisterClient(int32_t clientId, bool* _aidl_return) {
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ALOGD("unregisterClient id: %d", clientId);
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int32_t callingUid = AIBinder_getCallingUid();
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int32_t callingPid = AIBinder_getCallingPid();
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// Only the client with clientId or the trusted caller could unregister the client.
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if (callingPid != clientId) {
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if (!isTrustedCallingUid(callingUid)) {
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ALOGE("Untrusted caller (calling PID %d, UID %d) trying to "
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"unregister client with id: %d",
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callingUid, callingPid, clientId);
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*_aidl_return = true;
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return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
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"Untrusted caller (calling PID %d, UID %d) trying to "
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"unregister client with id: %d",
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callingUid, callingPid, clientId);
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}
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}
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*_aidl_return = (mTranscodingClientManager.removeClient(clientId) == OK);
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return Status::ok();
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}
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Status MediaTranscodingService::getNumOfClients(int32_t* _aidl_return) {
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ALOGD("MediaTranscodingService::getNumOfClients");
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*_aidl_return = mTranscodingClientManager.getNumOfClients();
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return Status::ok();
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}
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Status MediaTranscodingService::submitRequest(int32_t /*clientId*/,
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const TranscodingRequestParcel& /*request*/,
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TranscodingJobParcel* /*job*/,
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int32_t* /*_aidl_return*/) {
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// TODO(hkuang): Add implementation.
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return Status::ok();
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}
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Status MediaTranscodingService::cancelJob(int32_t /*in_clientId*/, int32_t /*in_jobId*/,
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bool* /*_aidl_return*/) {
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// TODO(hkuang): Add implementation.
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return Status::ok();
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}
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Status MediaTranscodingService::getJobWithId(int32_t /*in_jobId*/,
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TranscodingJobParcel* /*out_job*/,
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bool* /*_aidl_return*/) {
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// TODO(hkuang): Add implementation.
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return Status::ok();
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}
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} // namespace android
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