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