sandboxed-api/sandboxed_api/sandbox2/sandbox2.cc
Sandboxed API Team 63f0adbfbb Revert of monitor code update.
PiperOrigin-RevId: 247255592
Change-Id: I3656ea1628418321b1b8b02660b6a51a58c2c61f
2019-05-08 11:34:26 -07:00

133 lines
3.9 KiB
C++

// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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.
// Implementation file for the sandbox2::Sandbox class.
#include "sandboxed_api/sandbox2/sandbox2.h"
#include <csignal>
#include <memory>
#include <string>
#include "absl/memory/memory.h"
#include "absl/synchronization/blocking_counter.h"
#include "sandboxed_api/sandbox2/monitor.h"
#include "sandboxed_api/sandbox2/result.h"
#include "sandboxed_api/util/canonical_errors.h"
namespace sandbox2 {
Sandbox2::~Sandbox2() {
if (monitor_thread_ && monitor_thread_->joinable()) {
monitor_thread_->join();
}
}
sapi::StatusOr<Result> Sandbox2::AwaitResultWithTimeout(
absl::Duration timeout) {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
CHECK(monitor_thread_ != nullptr) << "Sandbox was already waited on";
absl::MutexLock lock(&monitor_->done_mutex_);
auto done = monitor_->done_mutex_.AwaitWithTimeout(
absl::Condition(monitor_.get(), &Monitor::IsDone), timeout);
if (!done) {
return ::sapi::DeadlineExceededError(
"Sandbox did not finish within timeout");
}
monitor_thread_->join();
CHECK(IsTerminated()) << "Monitor did not terminate";
// Reset the Monitor Thread object to its initial state, as to mark that this
// object cannot be used anymore to control behavior of the sandboxee (e.g.
// via signals).
monitor_thread_.reset(nullptr);
VLOG(1) << "Final execution status: " << monitor_->result_.ToString();
CHECK(monitor_->result_.final_status() != Result::UNSET);
return std::move(monitor_->result_);
}
Result Sandbox2::AwaitResult() {
return AwaitResultWithTimeout(absl::InfiniteDuration()).ValueOrDie();
}
bool Sandbox2::RunAsync() {
Launch();
// If the sandboxee setup failed we return 'false' here.
if (monitor_->IsDone() &&
monitor_->result_.final_status() == Result::SETUP_ERROR) {
return false;
}
return true;
}
void Sandbox2::Kill() {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
// The sandboxee (and its monitoring thread) are already gone. Ignore the
// request instead of panic'ing in such case.
if (monitor_thread_ == nullptr) {
return;
}
pthread_kill(monitor_thread_->native_handle(), Monitor::kExternalKillSignal);
}
void Sandbox2::DumpStackTrace() {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
if (monitor_thread_ == nullptr) {
return;
}
pthread_kill(monitor_thread_->native_handle(), Monitor::kDumpStackSignal);
}
bool Sandbox2::IsTerminated() const {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
return monitor_->IsDone();
}
void Sandbox2::SetWallTimeLimit(time_t limit) const {
CHECK(monitor_ != nullptr) << "Sandbox was not launched yet";
if (monitor_thread_ == nullptr) {
return;
}
union sigval v;
v.sival_int = static_cast<int>(limit);
pthread_sigqueue(monitor_thread_->native_handle(), Monitor::kTimerSetSignal,
v);
}
void Sandbox2::Launch() {
monitor_ =
absl::make_unique<Monitor>(executor_.get(), policy_.get(), notify_.get());
monitor_thread_ =
absl::make_unique<std::thread>(&Monitor::Run, monitor_.get());
// Wait for the Monitor to set-up the sandboxee correctly (or fail while
// doing that). From here on, it is safe to use the IPC object for
// non-sandbox-related data exchange.
monitor_->setup_counter_->Wait();
}
} // namespace sandbox2