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#include <windows.h>
#include <psapi.h>
#include <stdio.h>
#include <stdbool.h>
#include <assert.h>
#include "native.h"
typedef LONG (NTAPI *NtSuspendProcess)(IN HANDLE ProcessHandle);
typedef LONG (NTAPI *NtResumeProcess)(IN HANDLE ProcessHandle);
/* Standard error macro for reporting API errors */
#define PERR(bSuccess, api){if(!(bSuccess)) printf("%s:Error %ld from %s \
on line %ld\n", __FILE__, GetLastError(), api, (long)__LINE__);}
void initNativeData(native_data *nd)
{
assert(nd);
nd->alloc_fn = mem_alloc;
nd->read_fn = read_procmem;
nd->write_fn = write_procmem;
nd->suspend_fn = suspendProcess;
nd->iterate_fn = iterate_mem;
}
/* see: https://support.microsoft.com/en-us/help/99261/how-to-performing-clear-screen-cls-in-a-console-application */
void cls(HANDLE hConsole)
{
COORD coordScreen = { 0, 0 }; /* here's where we'll home the
cursor */
BOOL bSuccess;
DWORD cCharsWritten;
CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */
DWORD dwConSize; /* number of character cells in
the current buffer */
/* get the number of character cells in the current buffer */
bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );
PERR( bSuccess, "GetConsoleScreenBufferInfo" );
dwConSize = csbi.dwSize.X * csbi.dwSize.Y;
/* fill the entire screen with blanks */
bSuccess = FillConsoleOutputCharacter( hConsole, (TCHAR) ' ',
dwConSize, coordScreen, &cCharsWritten );
PERR( bSuccess, "FillConsoleOutputCharacter" );
/* get the current text attribute */
bSuccess = GetConsoleScreenBufferInfo( hConsole, &csbi );
PERR( bSuccess, "ConsoleScreenBufferInfo" );
/* now set the buffer's attributes accordingly */
bSuccess = FillConsoleOutputAttribute( hConsole, csbi.wAttributes,
dwConSize, coordScreen, &cCharsWritten );
PERR( bSuccess, "FillConsoleOutputAttribute" );
/* put the cursor at (0, 0) */
bSuccess = SetConsoleCursorPosition( hConsole, coordScreen );
PERR( bSuccess, "SetConsoleCursorPosition" );
return;
}
bool get_module_proc(native_data *nd, LPCTSTR window_name)
{
HWND hwnd;
assert(window_name);
hwnd = FindWindow(NULL, window_name);
if (!hwnd)
goto error;
GetWindowThreadProcessId(hwnd, &nd->proc.pid);
if (!nd->proc.pid)
goto error;
nd->proc.hndl = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_OPERATION
| PROCESS_VM_READ | PROCESS_VM_WRITE, 0, nd->proc.pid);
error:
return nd->proc.hndl != NULL;
}
bool get_module_info(native_data *nd, LPCTSTR module_name)
{
HMODULE hMods[1024];
DWORD cbNeeded;
unsigned int i;
assert(module_name);
if (EnumProcessModules(nd->proc.hndl, hMods, sizeof(hMods), &cbNeeded))
{
for (i = 0; i < (cbNeeded / sizeof(HMODULE)); i++)
{
TCHAR szModName[MAX_PATH];
TCHAR szModPath[MAX_PATH];
if (GetModuleBaseName(nd->proc.hndl, hMods[i], szModName, sizeof(szModName) / sizeof(TCHAR))
&& GetModuleFileNameEx(nd->proc.hndl, hMods[i], szModPath,
sizeof(szModPath) / sizeof(TCHAR)))
{
if (strncmp(szModName, module_name, MAX_PATH) == 0)
{
nd->proc.modbase = hMods[i];
MODULEINFO modinfo;
if (GetModuleInformation(nd->proc.hndl, nd->proc.modbase, &modinfo, sizeof modinfo))
nd->proc.modsize = modinfo.SizeOfImage;
else
return false;
return true;
}
}
}
}
return false;
}
bool read_procmem(const native_data *nd, unsigned long addr,
void *buffer, unsigned long siz)
{
SIZE_T bytes_read = 0;
unsigned long *vmptr = (unsigned long *)addr;
assert(buffer && siz);
if (!ReadProcessMemory(nd->proc.hndl, vmptr, buffer, siz, &bytes_read))
return false;
if (bytes_read != siz)
return false;
return true;
}
bool write_procmem(const native_data *nd, unsigned long addr, const void *buffer, unsigned long siz)
{
SIZE_T bytes_written = 0;
unsigned long *vmptr = (unsigned long *)addr;
assert(addr && buffer && siz);
if (!WriteProcessMemory(nd->proc.hndl, vmptr, buffer, siz, &bytes_written))
return false;
if (bytes_written != siz)
return false;
return true;
}
unsigned long mem_alloc(const native_data *nd, unsigned long siz)
{
return (unsigned long)VirtualAllocEx(nd->proc.hndl, NULL, siz,
MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);
}
/* see: https://github.com/mridgers/clink/issues/420 */
bool suspendProcess(const native_data *nd, int doResume)
{
bool ret = false;
NtSuspendProcess pfnNtSuspendProcess =
(NtSuspendProcess)GetProcAddress(GetModuleHandle("ntdll"), "NtSuspendProcess");
NtResumeProcess pfnNtResumeProcess =
(NtResumeProcess)GetProcAddress(GetModuleHandle("ntdll"), "NtResumeProcess");
HANDLE processHandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, nd->proc.pid);
if (!processHandle)
return false;
if (doResume)
{
if (pfnNtResumeProcess(processHandle) == 0)
ret = true;
}
else
{
if (pfnNtSuspendProcess(processHandle) == 0)
ret = true;
}
CloseHandle(processHandle);
return ret;
}
unsigned long iterate_mem(const native_data *nd,
unsigned long *addr,
unsigned long *size)
{
MEMORY_BASIC_INFORMATION info;
SIZE_T ret;
ret = VirtualQueryEx(nd->proc.hndl, (LPCVOID) *addr, &info, sizeof info);
if (ret != sizeof(info))
goto error;
*addr = (unsigned long) info.BaseAddress;
*size = info.RegionSize;
return info.State != MEM_COMMIT;
error:
*addr = 0;
*size = 0;
return 1;
}
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