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platform_system_core/init/service.h

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/*
* Copyright (C) 2015 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.
*/
#ifndef _INIT_SERVICE_H
#define _INIT_SERVICE_H
#include <sys/types.h>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include <android-base/chrono_utils.h>
#include <cutils/iosched_policy.h>
#include "action.h"
#include "capabilities.h"
#include "descriptors.h"
#include "init_parser.h"
#include "keyword_map.h"
#include "util.h"
#define SVC_DISABLED 0x001 // do not autostart with class
#define SVC_ONESHOT 0x002 // do not restart on exit
#define SVC_RUNNING 0x004 // currently active
#define SVC_RESTARTING 0x008 // waiting to restart
#define SVC_CONSOLE 0x010 // requires console
#define SVC_CRITICAL 0x020 // will reboot into recovery if keeps crashing
#define SVC_RESET 0x040 // Use when stopping a process,
// but not disabling so it can be restarted with its class.
#define SVC_RC_DISABLED 0x080 // Remember if the disabled flag was set in the rc script.
#define SVC_RESTART 0x100 // Use to safely restart (stop, wait, start) a service.
#define SVC_DISABLED_START 0x200 // A start was requested but it was disabled at the time.
#define SVC_EXEC 0x400 // This service was started by either 'exec' or 'exec_start' and stops
// init from processing more commands until it completes
#define SVC_SHUTDOWN_CRITICAL 0x800 // This service is critical for shutdown and
// should not be killed during shutdown
#define SVC_TEMPORARY 0x1000 // This service was started by 'exec' and should be removed from the
// service list once it is reaped.
#define NR_SVC_SUPP_GIDS 12 // twelve supplementary groups
class Action;
class ServiceManager;
struct ServiceEnvironmentInfo {
ServiceEnvironmentInfo();
ServiceEnvironmentInfo(const std::string& name, const std::string& value);
std::string name;
std::string value;
};
class Service {
public:
Service(const std::string& name, const std::vector<std::string>& args);
Service(const std::string& name, unsigned flags, uid_t uid, gid_t gid,
const std::vector<gid_t>& supp_gids, const CapSet& capabilities,
unsigned namespace_flags, const std::string& seclabel,
const std::vector<std::string>& args);
bool IsRunning() { return (flags_ & SVC_RUNNING) != 0; }
bool ParseLine(const std::vector<std::string>& args, std::string* err);
bool ExecStart(std::unique_ptr<Timer>* exec_waiter);
bool Start();
bool StartIfNotDisabled();
bool Enable();
void Reset();
void Stop();
void Terminate();
void Restart();
void RestartIfNeeded(time_t* process_needs_restart_at);
void Reap();
void DumpState() const;
void SetShutdownCritical() { flags_ |= SVC_SHUTDOWN_CRITICAL; }
bool IsShutdownCritical() const { return (flags_ & SVC_SHUTDOWN_CRITICAL) != 0; }
const std::string& name() const { return name_; }
const std::set<std::string>& classnames() const { return classnames_; }
unsigned flags() const { return flags_; }
pid_t pid() const { return pid_; }
uid_t uid() const { return uid_; }
gid_t gid() const { return gid_; }
int priority() const { return priority_; }
const std::vector<gid_t>& supp_gids() const { return supp_gids_; }
const std::string& seclabel() const { return seclabel_; }
const std::vector<int>& keycodes() const { return keycodes_; }
int keychord_id() const { return keychord_id_; }
void set_keychord_id(int keychord_id) { keychord_id_ = keychord_id; }
const std::vector<std::string>& args() const { return args_; }
private:
using OptionParser = bool (Service::*) (const std::vector<std::string>& args,
std::string* err);
class OptionParserMap;
void NotifyStateChange(const std::string& new_state) const;
void StopOrReset(int how);
void ZapStdio() const;
void OpenConsole() const;
void KillProcessGroup(int signal);
void SetProcessAttributes();
bool ParseCapabilities(const std::vector<std::string>& args, std::string *err);
bool ParseClass(const std::vector<std::string>& args, std::string* err);
bool ParseConsole(const std::vector<std::string>& args, std::string* err);
bool ParseCritical(const std::vector<std::string>& args, std::string* err);
bool ParseDisabled(const std::vector<std::string>& args, std::string* err);
bool ParseGroup(const std::vector<std::string>& args, std::string* err);
bool ParsePriority(const std::vector<std::string>& args, std::string* err);
bool ParseIoprio(const std::vector<std::string>& args, std::string* err);
bool ParseKeycodes(const std::vector<std::string>& args, std::string* err);
bool ParseOneshot(const std::vector<std::string>& args, std::string* err);
bool ParseOnrestart(const std::vector<std::string>& args, std::string* err);
bool ParseOomScoreAdjust(const std::vector<std::string>& args, std::string* err);
bool ParseNamespace(const std::vector<std::string>& args, std::string* err);
bool ParseSeclabel(const std::vector<std::string>& args, std::string* err);
bool ParseSetenv(const std::vector<std::string>& args, std::string* err);
bool ParseSocket(const std::vector<std::string>& args, std::string* err);
bool ParseFile(const std::vector<std::string>& args, std::string* err);
bool ParseUser(const std::vector<std::string>& args, std::string* err);
bool ParseWritepid(const std::vector<std::string>& args, std::string* err);
template <typename T>
bool AddDescriptor(const std::vector<std::string>& args, std::string* err);
std::string name_;
std::set<std::string> classnames_;
std::string console_;
unsigned flags_;
pid_t pid_;
android::base::boot_clock::time_point time_started_; // time of last start
android::base::boot_clock::time_point time_crashed_; // first crash within inspection window
int crash_count_; // number of times crashed within window
uid_t uid_;
gid_t gid_;
std::vector<gid_t> supp_gids_;
CapSet capabilities_;
unsigned namespace_flags_;
std::string seclabel_;
std::vector<std::unique_ptr<DescriptorInfo>> descriptors_;
std::vector<ServiceEnvironmentInfo> envvars_;
Action onrestart_; // Commands to execute on restart.
std::vector<std::string> writepid_files_;
// keycodes for triggering this service via /dev/keychord
std::vector<int> keycodes_;
int keychord_id_;
IoSchedClass ioprio_class_;
int ioprio_pri_;
int priority_;
int oom_score_adjust_;
std::vector<std::string> args_;
};
class ServiceManager {
public:
static ServiceManager& GetInstance();
void AddService(std::unique_ptr<Service> service);
Service* MakeExecOneshotService(const std::vector<std::string>& args);
bool Exec(const std::vector<std::string>& args);
bool ExecStart(const std::string& name);
bool IsWaitingForExec() const;
Service* FindServiceByName(const std::string& name) const;
Service* FindServiceByPid(pid_t pid) const;
Service* FindServiceByKeychord(int keychord_id) const;
void ForEachService(const std::function<void(Service*)>& callback) const;
void ForEachServiceInClass(const std::string& classname,
void (*func)(Service* svc)) const;
void ForEachServiceWithFlags(unsigned matchflags,
void (*func)(Service* svc)) const;
void ReapAnyOutstandingChildren();
void RemoveService(const Service& svc);
void DumpState() const;
private:
ServiceManager();
// Cleans up a child process that exited.
// Returns true iff a children was cleaned up.
bool ReapOneProcess();
static int exec_count_; // Every service needs a unique name.
std::unique_ptr<Timer> exec_waiter_;
std::vector<std::unique_ptr<Service>> services_;
};
class ServiceParser : public SectionParser {
public:
ServiceParser(ServiceManager* service_manager)
: service_manager_(service_manager), service_(nullptr) {}
bool ParseSection(std::vector<std::string>&& args, const std::string& filename, int line,
std::string* err) override;
bool ParseLineSection(std::vector<std::string>&& args, int line, std::string* err) override;
void EndSection() override;
private:
bool IsValidName(const std::string& name) const;
ServiceManager* service_manager_;
std::unique_ptr<Service> service_;
};
#endif
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