如何获取父进程的ID

如何获取父进程的ID
(hangwire发表于2001-12-26 17:00:47)

   从所周知，在Windows NT/2000系统的API黑洞之一便是NTDLL.DLL,此DLL包含了许多未公开的API函数。本文将列举一、二，并用它们示范如何获取任何指定进程的父进程ID。
   NTDLL.DLL中有一个函数叫NtQueryInformationProcess，用它可以将指定类型的进程信息拷贝到某个缓冲。其原型如下：
NTSYSAPI
NTSTATUS
NTAPI
NtQueryInformationProcess (
IN HANDLE ProcessHandle, // 进程句柄
IN PROCESSINFOCLASS InformationClass, // 信息类型
OUT PVOID ProcessInformation, // 缓冲指针
IN ULONG ProcessInformationLength, // 以字节为单位的缓冲大小
OUT PULONG ReturnLength OPTIONAL // 写入缓冲的字节数
);
    第一个参数是希望操作的进程句柄，这个句柄必须以PROCESS_QUERY_INFORMATION模式存取。为了取得一个句柄，我们必须用OpenProcess函数：
HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION,FALSE,dwProcessID);
    第二个参数是请求信息的类型，这个参数可以有许多个值，本文例子中将用ProcessBasicInformation （值为0）。
    因此，如果第二个参数是ProcessBasicInformation的话，则第三个参数必须为一个指针指向结构PROCESS_BASIC_INFORMATION：
typedef struct
{
      DWORD ExitStatus; // 接收进程终止状态
      DWORD PebBaseAddress; // 接收进程环境块地址
      DWORD AffinityMask; // 接收进程关联掩码
      DWORD BasePriority; // 接收进程的优先级类
      ULONG UniqueProcessId; // 接收进程ID
      ULONG InheritedFromUniqueProcessId; //接收父进程ID
} PROCESS_BASIC_INFORMATION;

   这个结构的最后一个参数是InheritedFromUniqueProcessId，它就是我们所要的东西。

DWORD dwParentPID;
LONG status;
PROCESS_BASIC_INFORMATION pbi;

status = NtQueryInformationProcess( hProcess,
ProcessBasicInformation,
(PVOID)&pbi,
sizeof(PROCESS_BASIC_INFORMATION),
NULL );

if (!status)

dwParentPID = pbi.InheritedFromUniqueProcessId;

// parent.cpp (Windows NT/2000)
//
// This example will show the method how you can retrieve the parent
// process ID on Windows NT/2000 using the NT Native API
// 
//
// (c)1999 Ashot Oganesyan K, SmartLine, Inc
// mailto:[email protected], http://www.protect-me.com, http://www.codepile.com

#include <windows.h>
#include <stdio.h>

#define ProcessBasicInformation 0

typedef struct
{
    DWORD ExitStatus;
    DWORD PebBaseAddress;
    DWORD AffinityMask;
    DWORD BasePriority;
    ULONG UniqueProcessId;
    ULONG InheritedFromUniqueProcessId;
}   PROCESS_BASIC_INFORMATION;


// ntdll!NtQueryInformationProcess (NT specific!)
//
// The function copies the process information of the
// specified type into a buffer
//
// NTSYSAPI
// NTSTATUS
// NTAPI
// NtQueryInformationProcess(
//    IN HANDLE ProcessHandle,              // handle to process
//    IN PROCESSINFOCLASS InformationClass, // information type
//    OUT PVOID ProcessInformation,         // pointer to buffer
//    IN ULONG ProcessInformationLength,    // buffer size in bytes
//    OUT PULONG ReturnLength OPTIONAL      // pointer to a 32-bit
//                                          // variable that receives
//                                          // the number of bytes
//                                          // written to the buffer 
// );
typedef LONG (WINAPI *PROCNTQSIP)(HANDLE,UINT,PVOID,ULONG,PULONG);


PROCNTQSIP NtQueryInformationProcess;

DWORD GetParentProcessID(DWORD dwId);

void main(int argc, char* argv[])
{
    if (argc<2)
    {
       printf("Usage:\n\nparent.exe ProcId\n");
       return;
    }

    NtQueryInformationProcess = (PROCNTQSIP)GetProcAddress(
                                            GetModuleHandle("ntdll"),
											"NtQueryInformationProcess"
											);

    if (!NtQueryInformationProcess)
       return;

    DWORD dwId;
    sscanf(argv[1],"%lu",&dwId);

    printf("Parent PID for %lu is %lu\n",dwId,GetParentProcessID(dwId));

}

DWORD GetParentProcessID(DWORD dwId)
{
    LONG                      status;
    DWORD                     dwParentPID = (DWORD)-1;
    HANDLE                    hProcess;
    PROCESS_BASIC_INFORMATION pbi;

    // Get process handle
    hProcess = OpenProcess(PROCESS_QUERY_INFORMATION,FALSE,dwId);
    if (!hProcess)
       return (DWORD)-1;

    // Retrieve information
    status = NtQueryInformationProcess( hProcess,
                                        ProcessBasicInformation,
                                        (PVOID)&pbi,
                                        sizeof(PROCESS_BASIC_INFORMATION),
                                        NULL
                                      );

    // Copy parent Id on success
    if  (!status)
        dwParentPID = pbi.InheritedFromUniqueProcessId;

    CloseHandle (hProcess);

   return dwParentPID;
}