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// Copyright 2014 The Crashpad Authors. 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.
#ifndef CRASHPAD_UTIL_POSIX_PROCESS_INFO_H_
#define CRASHPAD_UTIL_POSIX_PROCESS_INFO_H_
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <set>
#include <string>
#include <vector>
#include "base/macros.h"
#include "build/build_config.h"
#include "util/misc/initialization_state.h"
#include "util/misc/initialization_state_dcheck.h"
#if defined(OS_APPLE)
#include <mach/mach.h>
#include <sys/sysctl.h>
#endif
#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
#include "util/linux/ptrace_connection.h"
#endif
namespace crashpad {
class ProcessInfo {
public:
ProcessInfo();
~ProcessInfo();
#if defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID) || DOXYGEN
//! \brief Initializes this object with information about the process whose ID
//! is \a pid using a PtraceConnection \a connection.
//!
//! This method must be called successfully prior to calling any other method
//! in this class. This method may only be called once.
//!
//! It is unspecified whether the information that an object of this class
//! returns is loaded at the time Initialize() is called or subsequently, and
//! whether this information is cached in the object or not.
//!
//! \param[in] connection A connection to the remote process.
//!
//! \return `true` on success, `false` on failure with a message logged.
bool InitializeWithPtrace(PtraceConnection* connection);
#endif // OS_LINUX || OS_CHROMEOS || OS_ANDROID || DOXYGEN
#if defined(OS_APPLE) || DOXYGEN
//! \brief Initializes this object with information about the process whose ID
//! is \a pid.
//!
//! This method must be called successfully prior to calling any other method
//! in this class. This method may only be called once.
//!
//! It is unspecified whether the information that an object of this class
//! returns is loaded at the time Initialize() is called or subsequently, and
//! whether this information is cached in the object or not.
//!
//! \param[in] pid The process ID to obtain information for.
//!
//! \return `true` on success, `false` on failure with a message logged.
bool InitializeWithPid(pid_t pid);
//! \brief Initializes this object with information about a process based on
//! its Mach task.
//!
//! This method serves as a stand-in for InitializeWithPid() and may be called
//! in its place with the same restrictions and considerations.
//!
//! \param[in] task The Mach task to obtain information for.
//!
//! \return `true` on success, `false` on failure with an message logged.
bool InitializeWithTask(task_t task);
#endif
//! \return The target task’s process ID.
pid_t ProcessID() const;
//! \return The target task’s parent process ID.
pid_t ParentProcessID() const;
//! \return The target process’ real user ID as would be returned to it by
//! `getuid()`.
uid_t RealUserID() const;
//! \return The target process’ effective user ID as would be returned to it
//! by `geteuid()`.
uid_t EffectiveUserID() const;
//! \return The target process’ saved set-user ID.
uid_t SavedUserID() const;
//! \return the target process’ real group ID as would be returned to it by
//! `getgid()`.
gid_t RealGroupID() const;
//! \return the target process’ effective group ID as would be returned to it
//! by `getegid()`.
gid_t EffectiveGroupID() const;
//! \return The target process’ saved set-group ID.
gid_t SavedGroupID() const;
//! \return the target process’ supplementary group list as would be returned
//! to it by `getgroups()`.
std::set<gid_t> SupplementaryGroups() const;
//! \return All groups that the target process claims membership in, including
//! RealGroupID(), EffectiveGroupID(), SavedGroupID(), and
//! SupplementaryGroups().
std::set<gid_t> AllGroups() const;
//! \brief Determines whether the target process has changed privileges.
//!
//! A process is considered to have changed privileges if it has changed its
//! real, effective, or saved set-user or group IDs with the `setuid()`,
//! `seteuid()`, `setreuid()`, `setgid()`, `setegid()`, or `setregid()` system
//! calls since its most recent `execve()`, or if its privileges changed at
//! `execve()` as a result of executing a setuid or setgid executable.
bool DidChangePrivileges() const;
//! \brief Determines the target process’ bitness.
//!
//! \return `true` if the target task is a 64-bit process.
bool Is64Bit() const;
//! \brief Determines the target process’ start time.
//!
//! \param[out] start_time The time that the process started.
//!
//! \return `true` on success, with \a start_time set. Otherwise, `false` with
//! a message logged.
bool StartTime(timeval* start_time) const;
//! \brief Obtains the arguments used to launch a process.
//!
//! Whether it is possible to obtain this information for a process with
//! different privileges than the running program is system-dependent.
//!
//! \param[out] argv The process’ arguments as passed to its `main()` function
//! as the \a argv parameter, possibly modified by the process.
//!
//! \return `true` on success, with \a argv populated appropriately.
//! Otherwise, `false` with a message logged.
//!
//! \note This function may spuriously return `false` when used to examine a
//! process that it is calling `exec()`. If examining such a process, call
//! this function in a retry loop with a small (100ns) delay to avoid an
//! erroneous assumption that \a pid is not running.
bool Arguments(std::vector<std::string>* argv) const;
private:
#if defined(OS_APPLE)
kinfo_proc kern_proc_info_;
#elif defined(OS_LINUX) || defined(OS_CHROMEOS) || defined(OS_ANDROID)
// Some members are marked mutable so that they can be lazily initialized by
// const methods. These are always InitializationState-protected so that
// multiple successive calls will always produce the same return value and out
// parameters. This is necessary for intergration with the Snapshot interface.
// See https://crashpad.chromium.org/bug/9.
PtraceConnection* connection_;
std::set<gid_t> supplementary_groups_;
mutable timeval start_time_;
pid_t pid_;
pid_t ppid_;
uid_t uid_;
uid_t euid_;
uid_t suid_;
gid_t gid_;
gid_t egid_;
gid_t sgid_;
bool is_64_bit_;
mutable InitializationState start_time_initialized_;
#endif
InitializationStateDcheck initialized_;
DISALLOW_COPY_AND_ASSIGN(ProcessInfo);
};
} // namespace crashpad
#endif // CRASHPAD_UTIL_POSIX_PROCESS_INFO_H_