mirror of
https://github.com/google/sandboxed-api.git
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112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
// Copyright 2019 Google LLC
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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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// https://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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// StartGlobalForkServer() is called early in a process using a constructor, so
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// it can fork() safely (in a single-threaded context)
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#ifndef SANDBOXED_API_SANDBOX2_GLOBAL_FORKCLIENT_H_
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#define SANDBOXED_API_SANDBOX2_GLOBAL_FORKCLIENT_H_
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#include <sys/types.h>
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#include <bitset>
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#include <string>
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#include "absl/base/thread_annotations.h"
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#include "sandboxed_api/util/flag.h"
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#include "absl/strings/string_view.h"
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#include "absl/synchronization/mutex.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/fork_client.h"
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#include "sandboxed_api/sandbox2/forkserver.pb.h"
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namespace sandbox2 {
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enum class GlobalForkserverStartMode {
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kOnDemand,
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// MUST be the last element
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kNumGlobalForkserverStartModes,
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};
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class GlobalForkClient {
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public:
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GlobalForkClient(int fd, pid_t pid)
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: comms_(fd), fork_client_(pid, &comms_) {}
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static pid_t SendRequest(const ForkRequest& request, int exec_fd,
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int comms_fd, int user_ns_fd = -1,
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pid_t* init_pid = nullptr)
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ABSL_LOCKS_EXCLUDED(instance_mutex_);
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static pid_t GetPid() ABSL_LOCKS_EXCLUDED(instance_mutex_);
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static void EnsureStarted() ABSL_LOCKS_EXCLUDED(instance_mutex_) {
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EnsureStarted(GlobalForkserverStartMode::kOnDemand);
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}
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static void Shutdown() ABSL_LOCKS_EXCLUDED(instance_mutex_);
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static bool IsStarted() ABSL_LOCKS_EXCLUDED(instance_mutex_);
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private:
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friend void StartGlobalForkserverFromLibCtor();
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static void ForceStart() ABSL_LOCKS_EXCLUDED(instance_mutex_);
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static void EnsureStarted(GlobalForkserverStartMode mode)
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ABSL_LOCKS_EXCLUDED(instance_mutex_);
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static void EnsureStartedLocked(GlobalForkserverStartMode mode)
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ABSL_EXCLUSIVE_LOCKS_REQUIRED(instance_mutex_);
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static absl::Mutex instance_mutex_;
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static GlobalForkClient* instance_ ABSL_GUARDED_BY(instance_mutex_);
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Comms comms_;
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ForkClient fork_client_;
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};
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class GlobalForkserverStartModeSet {
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public:
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static constexpr size_t kSize = static_cast<size_t>(
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GlobalForkserverStartMode::kNumGlobalForkserverStartModes);
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GlobalForkserverStartModeSet() {}
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explicit GlobalForkserverStartModeSet(GlobalForkserverStartMode value) {
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value_[static_cast<size_t>(value)] = true;
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}
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GlobalForkserverStartModeSet& operator|=(GlobalForkserverStartMode value) {
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value_[static_cast<size_t>(value)] = true;
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return *this;
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}
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GlobalForkserverStartModeSet operator|(
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GlobalForkserverStartMode value) const {
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GlobalForkserverStartModeSet rv(*this);
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rv |= value;
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return rv;
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}
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bool contains(GlobalForkserverStartMode value) const {
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return value_[static_cast<size_t>(value)];
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}
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bool empty() { return value_.none(); }
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private:
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std::bitset<kSize> value_;
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};
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bool AbslParseFlag(absl::string_view text, GlobalForkserverStartModeSet* out,
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std::string* error);
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std::string AbslUnparseFlag(GlobalForkserverStartModeSet in);
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} // namespace sandbox2
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ABSL_DECLARE_FLAG(string, sandbox2_forkserver_start_mode);
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#endif // SANDBOXED_API_SANDBOX2_GLOBAL_FORKCLIENT_H_
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