Windows C++遍历所有进程的命令行

代码如下：

#include "stdafx.h"
#include "GetCmdLine.h"

int _tmain(int argc, _TCHAR* argv[])
{
    if (argc < 2)
    {
        printf("Format is GetCmdLine <process id>\n");
        return 0;
    }

    // get process identifier
    DWORD dwId = _wtoi(argv[1]);

    // open the process
    HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, dwId);
    DWORD err = 0;
    if (hProcess == NULL)
    {
        printf("OpenProcess %u failed\n", dwId);
        err = GetLastError();
        return -1;
    }

    // determine if 64 or 32-bit processor
    SYSTEM_INFO si;
    GetNativeSystemInfo(&si);

    // determine if this process is running on WOW64
    BOOL wow;
    IsWow64Process(GetCurrentProcess(), &wow);

    // use WinDbg "dt ntdll!_PEB" command and search for ProcessParameters offset to find the truth out
    DWORD ProcessParametersOffset = si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 ? 0x20 : 0x10;
    DWORD CommandLineOffset = si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64 ? 0x70 : 0x40;

    // read basic info to get ProcessParameters address, we only need the beginning of PEB
    DWORD pebSize = ProcessParametersOffset + 8;
    PBYTE peb = (PBYTE)malloc(pebSize);
    ZeroMemory(peb, pebSize);

    // read basic info to get CommandLine address, we only need the beginning of ProcessParameters
    DWORD ppSize = CommandLineOffset + 16;
    PBYTE pp = (PBYTE)malloc(ppSize);
    ZeroMemory(pp, ppSize);

    PWSTR cmdLine;

    if (wow)
    {
        // we're running as a 32-bit process in a 64-bit OS
        PROCESS_BASIC_INFORMATION_WOW64 pbi;
        ZeroMemory(&pbi, sizeof(pbi));

        // get process information from 64-bit world
        _NtQueryInformationProcess query = (_NtQueryInformationProcess)GetProcAddress(GetModuleHandleA("ntdll.dll"), "NtWow64QueryInformationProcess64");
        err = query(hProcess, 0, &pbi, sizeof(pbi), NULL);
        if (err != 0)
        {
            printf("NtWow64QueryInformationProcess64 failed\n");
            CloseHandle(hProcess);
            return -1;
        }

        // read PEB from 64-bit address space
        _NtWow64ReadVirtualMemory64 read = (_NtWow64ReadVirtualMemory64)GetProcAddress(GetModuleHandleA("ntdll.dll"), "NtWow64ReadVirtualMemory64");
        err = read(hProcess, pbi.PebBaseAddress, peb, pebSize, NULL);
        if (err != 0)
        {
            printf("NtWow64ReadVirtualMemory64 PEB failed\n");
            CloseHandle(hProcess);
            return -1;
        }

        // read ProcessParameters from 64-bit address space
        // PBYTE* parameters = (PBYTE*)*(LPVOID*)(peb + ProcessParametersOffset); // address in remote process address space
        PVOID64 parameters = (PVOID64) * ((PVOID64*)(peb + ProcessParametersOffset)); // corrected 64-bit address, see comments
        err = read(hProcess, parameters, pp, ppSize, NULL);
        if (err != 0)
        {
            printf("NtWow64ReadVirtualMemory64 Parameters failed\n");
            CloseHandle(hProcess);
            return -1;
        }

        // read CommandLine
        UNICODE_STRING_WOW64* pCommandLine = (UNICODE_STRING_WOW64*)(pp + CommandLineOffset);
        cmdLine = (PWSTR)malloc(pCommandLine->MaximumLength);
        err = read(hProcess, pCommandLine->Buffer, cmdLine, pCommandLine->MaximumLength, NULL);
        if (err != 0)
        {
            printf("NtWow64ReadVirtualMemory64 Parameters failed\n");
            CloseHandle(hProcess);
            return -1;
        }
    }
    else
    {
        // we're running as a 32-bit process in a 32-bit OS, or as a 64-bit process in a 64-bit OS
        PROCESS_BASIC_INFORMATION pbi;
        ZeroMemory(&pbi, sizeof(pbi));

        // get process information
        _NtQueryInformationProcess query = (_NtQueryInformationProcess)GetProcAddress(GetModuleHandleA("ntdll.dll"), "NtQueryInformationProcess");
        err = query(hProcess, 0, &pbi, sizeof(pbi), NULL);
        if (err != 0)
        {
            printf("NtQueryInformationProcess failed\n");
            CloseHandle(hProcess);
            return -1;
        }

        // read PEB
        if (!ReadProcessMemory(hProcess, pbi.PebBaseAddress, peb, pebSize, NULL))
        {
            printf("ReadProcessMemory PEB failed\n");
            CloseHandle(hProcess);
            return -1;
        }

        // read ProcessParameters
        PBYTE* parameters = (PBYTE*)*(LPVOID*)(peb + ProcessParametersOffset); // address in remote process adress space
        if (!ReadProcessMemory(hProcess, parameters, pp, ppSize, NULL))
        {
            printf("ReadProcessMemory Parameters failed\n");
            CloseHandle(hProcess);
            return -1;
        }

        // read CommandLine
        UNICODE_STRING* pCommandLine = (UNICODE_STRING*)(pp + CommandLineOffset);
        cmdLine = (PWSTR)malloc(pCommandLine->MaximumLength);
        if (!ReadProcessMemory(hProcess, pCommandLine->Buffer, cmdLine, pCommandLine->MaximumLength, NULL))
        {
            printf("ReadProcessMemory Parameters failed\n");
            CloseHandle(hProcess);
            return -1;
        }
    }
    printf("%S\n", cmdLine);
    return 0;
}

GetCmdLine.h如下：

#pragma once
#include "stdafx.h"

// NtQueryInformationProcess for pure 32 and 64-bit processes
typedef NTSTATUS (NTAPI *_NtQueryInformationProcess)(
    IN HANDLE ProcessHandle,
    ULONG ProcessInformationClass,
    OUT PVOID ProcessInformation,
    IN ULONG ProcessInformationLength,
    OUT PULONG ReturnLength OPTIONAL
    );

typedef NTSTATUS (NTAPI *_NtReadVirtualMemory)(
    IN HANDLE ProcessHandle,
    IN PVOID BaseAddress,
    OUT PVOID Buffer,
    IN SIZE_T Size,
    OUT PSIZE_T NumberOfBytesRead);

// NtQueryInformationProcess for 32-bit process on WOW64
typedef NTSTATUS (NTAPI *_NtWow64ReadVirtualMemory64)(
    IN HANDLE ProcessHandle,
    IN PVOID64 BaseAddress,
    OUT PVOID Buffer,
    IN ULONG64 Size,
    OUT PULONG64 NumberOfBytesRead);

// PROCESS_BASIC_INFORMATION for pure 32 and 64-bit processes
typedef struct _PROCESS_BASIC_INFORMATION {
    PVOID Reserved1;
    PVOID PebBaseAddress;
    PVOID Reserved2[2];
    ULONG_PTR UniqueProcessId;
    PVOID Reserved3;
} PROCESS_BASIC_INFORMATION;

// PROCESS_BASIC_INFORMATION for 32-bit process on WOW64
// The definition is quite funky, as we just lazily doubled sizes to match offsets...
typedef struct _PROCESS_BASIC_INFORMATION_WOW64 {
    PVOID Reserved1[2];
    PVOID64 PebBaseAddress;
    PVOID Reserved2[4];
    ULONG_PTR UniqueProcessId[2];
    PVOID Reserved3[2];
} PROCESS_BASIC_INFORMATION_WOW64;

typedef struct _UNICODE_STRING {
  USHORT Length;
  USHORT MaximumLength;
  PWSTR  Buffer;
} UNICODE_STRING;

typedef struct _UNICODE_STRING_WOW64 {
  USHORT Length;
  USHORT MaximumLength;
  PVOID64 Buffer;
} UNICODE_STRING_WOW64;

参考链接：

https://stackoverflow.com/a/14012919