mirror of
https://github.com/google/sandboxed-api.git
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129 lines
3.9 KiB
C++
129 lines
3.9 KiB
C++
// Copyright 2019 Google LLC. All Rights Reserved.
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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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// Implementation file for the sandbox2::Sandbox class.
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#include "sandboxed_api/sandbox2/sandbox2.h"
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#include <csignal>
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#include <memory>
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#include <string>
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#include "absl/memory/memory.h"
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#include "sandboxed_api/sandbox2/monitor.h"
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#include "sandboxed_api/sandbox2/result.h"
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#include "sandboxed_api/util/canonical_errors.h"
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namespace sandbox2 {
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Sandbox2::~Sandbox2() {
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if (monitor_thread_ && monitor_thread_->joinable()) {
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monitor_thread_->join();
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}
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}
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sapi::StatusOr<Result> Sandbox2::AwaitResultWithTimeout(
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absl::Duration timeout) {
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CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
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CHECK(monitor_thread_ != nullptr) << "Sandbox was already waited on";
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auto done =
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monitor_->done_notification_.WaitForNotificationWithTimeout(timeout);
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if (!done) {
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return ::sapi::DeadlineExceededError(
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"Sandbox did not finish within timeout");
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}
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monitor_thread_->join();
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CHECK(IsTerminated()) << "Monitor did not terminate";
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// Reset the Monitor Thread object to its initial state, as to mark that this
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// object cannot be used anymore to control behavior of the sandboxee (e.g.
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// via signals).
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monitor_thread_.reset(nullptr);
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VLOG(1) << "Final execution status: " << monitor_->result_.ToString();
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CHECK(monitor_->result_.final_status() != Result::UNSET);
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return std::move(monitor_->result_);
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}
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Result Sandbox2::AwaitResult() {
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return AwaitResultWithTimeout(absl::InfiniteDuration()).ValueOrDie();
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}
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bool Sandbox2::RunAsync() {
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Launch();
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// If the sandboxee setup failed we return 'false' here.
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if (monitor_->IsDone() &&
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monitor_->result_.final_status() == Result::SETUP_ERROR) {
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return false;
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}
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return true;
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}
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void Sandbox2::NotifyMonitor() {
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if (monitor_thread_ != nullptr) {
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pthread_kill(monitor_thread_->native_handle(), SIGCHLD);
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}
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}
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void Sandbox2::Kill() {
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CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
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monitor_->external_kill_request_flag_.clear(std::memory_order_relaxed);
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NotifyMonitor();
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}
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void Sandbox2::DumpStackTrace() {
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CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
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monitor_->dump_stack_request_flag_.clear(std::memory_order_relaxed);
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NotifyMonitor();
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}
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bool Sandbox2::IsTerminated() const {
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CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
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return monitor_->IsDone();
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}
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void Sandbox2::SetWallTimeLimit(time_t limit) const {
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CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
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if (limit == 0) {
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VLOG(1) << "Disarming walltime timer to ";
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monitor_->deadline_millis_.store(0, std::memory_order_relaxed);
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} else {
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VLOG(1) << "Will set the walltime timer to " << limit << " seconds";
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auto deadline = absl::Now() + absl::Seconds(limit);
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monitor_->deadline_millis_.store(absl::ToUnixMillis(deadline),
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std::memory_order_relaxed);
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}
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}
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void Sandbox2::Launch() {
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monitor_ =
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absl::make_unique<Monitor>(executor_.get(), policy_.get(), notify_.get());
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monitor_thread_ =
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absl::make_unique<std::thread>(&Monitor::Run, monitor_.get());
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// Wait for the Monitor to set-up the sandboxee correctly (or fail while
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// doing that). From here on, it is safe to use the IPC object for
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// non-sandbox-related data exchange.
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monitor_->setup_notification_.WaitForNotification();
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}
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} // namespace sandbox2
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