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/*
* Copyright (C) 2020 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 "LogReaderList.h"
#include <android-base/logging.h>
#include <android/os/logcat/ILogcatManagerService.h>
#include <binder/IServiceManager.h>
using android::defaultServiceManager;
using android::sp;
using android::String16;
using android::os::logcat::ILogcatManagerService;
static sp<ILogcatManagerService> InitLogcatService() {
return android::interface_cast<ILogcatManagerService>(
defaultServiceManager()->waitForService(String16("logcat")));
}
static sp<ILogcatManagerService> GetLogcatService() {
static sp<ILogcatManagerService> logcat_service = InitLogcatService();
if (logcat_service == nullptr) {
LOG(ERROR) << "Permission problem or fatal error occurs to get logcat service";
}
return logcat_service;
}
// When we are notified a new log entry is available, inform
// listening sockets who are watching this entry's log id.
void LogReaderList::NotifyNewLog(LogMask log_mask) const {
for (const auto& entry : running_reader_threads_) {
if (!entry->IsWatchingMultiple(log_mask)) {
continue;
}
if (entry->deadline().time_since_epoch().count() != 0) {
continue;
}
entry->TriggerReader();
}
}
bool LogReaderList::HandlePendingThread(uid_t uid, gid_t gid, pid_t pid, int32_t fd, bool approve) {
auto lock = std::lock_guard{logd_lock};
PendingReaderThreadKey key = {
.uid = uid,
.gid = gid,
.pid = pid,
.fd = fd,
};
auto iter = std::find_if(pending_reader_threads_.begin(), pending_reader_threads_.end(),
[&key](const auto& other) REQUIRES(logd_lock) {
return other->pending_reader_thread_key() == key;
});
if (iter == pending_reader_threads_.end()) {
return false;
}
auto entry = std::move(*iter);
pending_reader_threads_.erase(iter);
if (!approve) {
entry->Revoke();
} else {
entry->set_track_flag();
}
AddAndRunThread(std::move(entry));
return true;
}
void LogReaderList::AddAndRunThread(std::unique_ptr<LogReaderThread> thread) {
thread->Run();
running_reader_threads_.emplace_front(std::move(thread));
}
void LogReaderList::RemoveRunningThread(LogReaderThread* thread) {
auto iter = std::find_if(running_reader_threads_.begin(), running_reader_threads_.end(),
[thread](const auto& other)
REQUIRES(logd_lock) { return other.get() == thread; });
if (iter == running_reader_threads_.end()) {
return;
}
// If the track_flag is false, we don't need to notify LogcatManagerService.
// All the native processes are in this category, so we can remove the
// dependency on system_server for the native processes.
if (!thread->track_flag()) {
running_reader_threads_.erase(iter);
return;
}
auto service = GetLogcatService();
if (service != nullptr) {
const PendingReaderThreadKey key = thread->pending_reader_thread_key();
service->finishThread(key.uid, key.gid, key.pid, key.fd);
}
running_reader_threads_.erase(iter);
}
void LogReaderList::AddPendingThread(std::unique_ptr<LogReaderThread> thread) {
auto service = GetLogcatService();
// If the logcat binder service is not available, we will be not able to
// check the user consent. So we revoke the privileges.
if (service == nullptr) {
thread->Revoke();
AddAndRunThread(std::move(thread));
return;
}
const PendingReaderThreadKey key = thread->pending_reader_thread_key();
service->startThread(key.uid, key.gid, key.pid, key.fd);
pending_reader_threads_.emplace_back(std::move(thread));
}
bool LogReaderList::ReleaseThreadByName(const std::string& cli_name) REQUIRES(logd_lock) {
for (const auto& reader : running_reader_threads_) {
if (reader->name() == cli_name) {
reader->Release();
return true;
}
}
for (const auto& reader : pending_reader_threads_) {
if (reader->name() == cli_name) {
reader->Release();
return true;
}
}
return false;
}
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