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// Copyright 2005-2019 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#ifndef MUMBLE_MUMBLE_PLUGIN_WIN32_H_
#define MUMBLE_MUMBLE_PLUGIN_WIN32_H_
# ifndef MUMBLE_PLUGIN_MAIN_H_
# error "Include mumble_plugin_main.h instead of mumble_plugin_win32.h"
# endif
#define _USE_MATH_DEFINES
#include <stdio.h>
#include <stdlib.h>
// Define "NOMINMAX" only if it isn't already.
// MinGW defines it by default, which results in a redefinition warning.
#ifndef NOMINMAX
# define NOMINMAX
#endif
#include <windows.h>
#include <tlhelp32.h>
#include <math.h>
#include <sstream>
#include <iostream>
#include <stdint.h>
static HANDLE hProcess;
static inline procid_t getProcess(const wchar_t *exename) {
PROCESSENTRY32 pe;
procid_t pid = 0;
pe.dwSize = sizeof(pe);
HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hSnap != INVALID_HANDLE_VALUE) {
BOOL ok = Process32First(hSnap, &pe);
while (ok) {
if (wcscmp(pe.szExeFile, exename)==0) {
pid = pe.th32ProcessID;
break;
}
ok = Process32Next(hSnap, &pe);
}
CloseHandle(hSnap);
}
return pid;
}
static inline int checkProcessIs64Bit(const procid_t &pid) {
// This function returns 0 if the process is 32-bit and 1 if it's 64-bit.
// In case of failure, it returns -1.
HANDLE handle = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, pid);
if (!handle) {
return -1;
}
// IsWow64Process() returns true if the process is 32-bit, running on a 64-bit system.
// It returns false in case the process is 64-bit, running on a 64-bit system.
// It also returns false if the process is 32-bit, running on a 32-bit system.
BOOL isWow64Process;
if (!IsWow64Process(handle, &isWow64Process)) {
CloseHandle(handle);
return -1;
}
CloseHandle(handle);
bool is32 = isWow64Process || sizeof(void*) == 4;
return !is32;
}
static inline procptr_t getModuleAddr(const procid_t &pid, const wchar_t *modname) {
MODULEENTRY32 me;
procptr_t ret = 0;
me.dwSize = sizeof(me);
HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE|TH32CS_SNAPMODULE32, pid);
if (hSnap != INVALID_HANDLE_VALUE) {
BOOL ok = Module32First(hSnap, &me);
while (ok) {
if (wcscmp(me.szModule, modname)==0) {
uintptr_t addr = reinterpret_cast<uintptr_t>(me.modBaseAddr);
ret = static_cast<procptr_t>(addr);
break;
}
ok = Module32Next(hSnap, &me);
}
CloseHandle(hSnap);
}
return ret;
}
static inline bool peekProc(const procptr_t &addr, void *dest, const size_t &len) {
SIZE_T r;
const BOOL ok = ReadProcessMemory(hProcess, reinterpret_cast<void *>(addr), dest, len, &r);
return (ok && (r == len));
}
static bool inline initialize(const std::multimap<std::wstring, unsigned long long int> &pids, const wchar_t *procname, const wchar_t *modname = nullptr) {
hProcess = nullptr;
pModule = 0;
if (!pids.empty()) {
std::multimap<std::wstring, unsigned long long int>::const_iterator iter = pids.find(std::wstring(procname));
if (iter != pids.end())
pPid = static_cast<procid_t>(iter->second);
else
pPid = 0;
} else {
pPid = getProcess(procname);
}
if (!pPid)
return false;
const int result = checkProcessIs64Bit(pPid);
if (result == -1) {
pPid = 0;
return false;
}
// We compare to 1 to prevent the following warning:
// C4800: 'BOOL': forcing value to bool 'true' or 'false' (performance warning)
is64Bit = (result == 1);
pModule = getModuleAddr(modname ? modname : procname);
if (!pModule) {
pPid = 0;
return false;
}
hProcess = OpenProcess(PROCESS_VM_READ, false, pPid);
if (!hProcess) {
pPid = 0;
pModule = 0;
return false;
}
return true;
}
static void generic_unlock() {
if (hProcess) {
CloseHandle(hProcess);
hProcess = nullptr;
pModule = 0;
pPid = 0;
}
}
#endif
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