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88e8cd86532ccb395ddcd1b8087a7dcbdc0384a6
Open-Shell-Menu/Src/Setup/Setup.cpp
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YellowNest 88e8cd8653 Restore Explorer shell if setup leaves it stopped (#2552) 
Restore Explorer shell after successful setup
2026-10-05 08:52:18 +02:00

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// Classic Shell (c) 2009-2017, Ivo Beltchev
// Open-Shell (c) 2017-2018, The Open-Shell Team
// Confidential information of Ivo Beltchev. Not for disclosure or distribution without prior written consent from the author
#define _WIN32_WINNT 0x0600
#include <windows.h>
#include <shlwapi.h>
#include <stdio.h>
#include <commctrl.h>
#include <vector>
#include "resource.h"
#include "StringUtils.h"
#include "FNVHash.h"
// Setup.exe is a bootstrap application that contains installers for x86, x64 and ARM64.
// It unpacks the right installer into the temp directory and executes it.
typedef BOOL (WINAPI *FIsWow64Process)( HANDLE hProcess, PBOOL Wow64Process );
typedef BOOL (WINAPI *FIsWow64Process2)( HANDLE hProcess, USHORT *pProcessMachine, USHORT *pNativeMachine );
typedef BOOL (WINAPI *FWow64DisableWow64FsRedirection)( PVOID* OldValue );
typedef BOOL (WINAPI *FWow64RevertWow64FsRedirection)( PVOID OldValue );
enum
{
ERR_WRONG_OS=101, // the OS is too old, Windows 7 or up is required
ERR_OLD_VERSION, // detected version older than 1.0.0
ERR_HASH_NOTFOUND, // the HASH resource is missing
ERR_MSIRES_NOTFOUND, // missing MSI resource
ERR_HASH_ERROR,
ERR_VERRES_NOTFOUND, // missing version resource
ERR_MSI_EXTRACTFAIL, // failed to extract the MSI file
ERR_MSIEXEC, // msiexec failed to start
};
enum ExtractType
{
None,
x86,
x64,
ARM64
};
struct Chunk
{
int start1, start2, len;
};
static bool IsExplorerShellRunning( void )
{
HWND shellWindow=GetShellWindow();
if (!shellWindow)
return false;
DWORD shellProcessId=0;
GetWindowThreadProcessId(shellWindow,&shellProcessId);
if (!shellProcessId)
return false;
DWORD currentSession=0;
DWORD shellSession=0;
if (!ProcessIdToSessionId(GetCurrentProcessId(),&currentSession) ||
!ProcessIdToSessionId(shellProcessId,&shellSession) ||
currentSession!=shellSession)
{
return false;
}
HANDLE process=OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION,FALSE,shellProcessId);
if (!process)
return false;
wchar_t path[_MAX_PATH];
DWORD pathSize=_countof(path);
bool isExplorer=false;
if (QueryFullProcessImageName(process,0,path,&pathSize))
isExplorer=_wcsicmp(PathFindFileName(path),L"explorer.exe")==0;
CloseHandle(process);
return isExplorer;
}
static void RestoreExplorerShellIfNeeded( bool wasRunning )
{
if (!wasRunning)
return;
// Restart Manager normally brings Explorer back before msiexec exits.
// Give it a short grace period before applying our fallback so we don't
// race a normal restart or create an extra Explorer process.
for (int i=0;i<50;i++)
{
if (IsExplorerShellRunning())
return;
Sleep(100);
}
wchar_t explorerPath[_MAX_PATH];
UINT len=GetWindowsDirectory(explorerPath,_countof(explorerPath));
if (!len || len>=_countof(explorerPath) || !PathAppend(explorerPath,L"explorer.exe"))
return;
STARTUPINFO startupInfo={sizeof(startupInfo)};
PROCESS_INFORMATION processInfo={};
if (CreateProcess(explorerPath,NULL,NULL,NULL,FALSE,0,NULL,NULL,&startupInfo,&processInfo))
{
CloseHandle(processInfo.hThread);
CloseHandle(processInfo.hProcess);
}
}
static void WriteFileXOR( HANDLE hFile, const unsigned char *buf, int size )
{
if (size>0)
{
std::vector<unsigned char> buf2;
buf2.reserve(size);
for (int i=0;i<size;i++)
buf2.push_back(buf[i]^0xFF);
DWORD q;
WriteFile(hFile,&buf2[0],size,&q,NULL);
}
}
static int ExtractMsi( HINSTANCE hInstance, const wchar_t *msiName, ExtractType extractType, bool bQuiet )
{
void *pRes=NULL;
HRSRC hResInfo=FindResource(hInstance,MAKEINTRESOURCE(IDR_MSI_CHECKSUM),L"MSI_FILE");
if (hResInfo)
{
HGLOBAL hRes=LoadResource(hInstance,hResInfo);
pRes=LockResource(hRes);
}
if (!pRes)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_INTERNAL,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_HASH_NOTFOUND;
}
unsigned int hash0=((unsigned int*)pRes)[extractType-1];
const Chunk *pChunks=NULL;
int chunkCount=0;
if (extractType==x64)
{
chunkCount=((unsigned int*)pRes)[3];
pChunks=(Chunk*)((unsigned int*)pRes+4);
}
if (extractType==ARM64)
{
int x64chunkCount=((unsigned int*)pRes)[3];
const Chunk *px64Chunks=(Chunk*)((unsigned int*)pRes+4);
chunkCount=((unsigned int*)(px64Chunks+x64chunkCount))[0];
pChunks = (Chunk*)((unsigned int*)(px64Chunks+x64chunkCount)+1);
}
// extract the installer
const unsigned char *pRes32=NULL;
hResInfo=FindResource(hInstance,MAKEINTRESOURCE(IDR_MSI_FILE32),L"MSI_FILE");
if (hResInfo)
{
HGLOBAL hRes=LoadResource(hInstance,hResInfo);
pRes32=(unsigned char*)LockResource(hRes);
}
if (!pRes32)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_INTERNAL,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_MSIRES_NOTFOUND;
}
const unsigned char *pRes64=NULL, *pResArm64=NULL;
int size32=SizeofResource(hInstance,hResInfo);
unsigned int hash;
int size64=0, sizeArm64=0;
if (extractType==x64)
{
HRSRC hResInfo=FindResource(hInstance,MAKEINTRESOURCE(IDR_MSI_FILE64),L"MSI_FILE");
if (hResInfo)
{
HGLOBAL hRes=LoadResource(hInstance,hResInfo);
pRes64=(unsigned char*)LockResource(hRes);
}
if (!pRes64)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_INTERNAL,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_MSIRES_NOTFOUND;
}
size64=SizeofResource(hInstance,hResInfo);
hash=FNV_HASH0;
int start=0;
int pos=0;
for (int i=0;i<chunkCount;i++)
{
const Chunk &chunk=pChunks[i];
if (start<chunk.start2)
hash=CalcFNVHash(pRes64+pos,chunk.start2-start,hash);
hash=CalcFNVHash(pRes32+chunk.start1,chunk.len,hash);
pos+=chunk.start2-start;
start=chunk.start2+chunk.len;
}
if (pos<size64)
hash=CalcFNVHash(pRes64+pos,size64-pos,hash);
}
else if (extractType==ARM64)
{
HRSRC hResInfo=FindResource(hInstance,MAKEINTRESOURCE(IDR_MSI_FILEARM64),L"MSI_FILE");
if (hResInfo)
{
HGLOBAL hRes=LoadResource(hInstance,hResInfo);
pResArm64=(unsigned char*)LockResource(hRes);
}
if (!pResArm64)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_INTERNAL,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_MSIRES_NOTFOUND;
}
sizeArm64=SizeofResource(hInstance,hResInfo);
hash=FNV_HASH0;
int start=0;
int pos=0;
for (int i=0;i<chunkCount;i++)
{
const Chunk& chunk = pChunks[i];
if (start<chunk.start2)
hash=CalcFNVHash(pResArm64+pos,chunk.start2-start,hash);
hash=CalcFNVHash(pRes32+chunk.start1,chunk.len,hash);
pos+=chunk.start2-start;
start=chunk.start2+chunk.len;
}
if (pos<sizeArm64)
hash=CalcFNVHash(pResArm64+pos,sizeArm64-pos,hash);
}
else
hash=CalcFNVHash(pRes32,size32);
if (hash!=hash0)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_CORRUPTED,strText,_countof(strText))) strText[0]=0;
wchar_t message[1024];
Sprintf(message,_countof(message),strText,msiName);
MessageBox(NULL,message,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_HASH_ERROR;
}
HANDLE hFile=CreateFile(msiName,GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
if (hFile==INVALID_HANDLE_VALUE)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_EXTRACT,strText,_countof(strText))) strText[0]=0;
wchar_t message[1024];
Sprintf(message,_countof(message),strText,msiName);
if (!bQuiet)
{
MessageBox(NULL,message,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_MSI_EXTRACTFAIL;
}
if (extractType==x64)
{
int start=0;
int pos=0;
for (int i=0;i<chunkCount;i++)
{
const Chunk &chunk=pChunks[i];
if (start<chunk.start2)
WriteFileXOR(hFile,pRes64+pos,chunk.start2-start);
WriteFileXOR(hFile,pRes32+chunk.start1,chunk.len);
pos+=chunk.start2-start;
start=chunk.start2+chunk.len;
}
if (pos<size64)
WriteFileXOR(hFile,pRes64+pos,size64-pos);
}
else if (extractType==ARM64)
{
int start=0;
int pos=0;
for (int i=0;i<chunkCount;i++)
{
const Chunk &chunk=pChunks[i];
if (start<chunk.start2)
WriteFileXOR(hFile,pResArm64+pos,chunk.start2-start);
WriteFileXOR(hFile,pRes32+chunk.start1,chunk.len);
pos+=chunk.start2-start;
start=chunk.start2+chunk.len;
}
if (pos<sizeArm64)
WriteFileXOR(hFile,pResArm64+pos,sizeArm64-pos);
}
else
{
WriteFileXOR(hFile,pRes32,size32);
}
CloseHandle(hFile);
return 0;
}
int APIENTRY wWinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow )
{
// get installer version
VS_FIXEDFILEINFO *pVer=NULL;
{
void *pRes=NULL;
HRSRC hResInfo=FindResource(hInstance,MAKEINTRESOURCE(VS_VERSION_INFO),RT_VERSION);
if (hResInfo)
{
HGLOBAL hRes=LoadResource(hInstance,hResInfo);
pRes=LockResource(hRes);
}
if (pRes)
pVer=(VS_FIXEDFILEINFO*)((char*)pRes+40);
}
int count;
wchar_t *const *params=CommandLineToArgvW(lpCmdLine,&count);
if (!params) count=0;
ExtractType extractType=None;
bool bQuiet=false;
for (;count>0;count--,params++)
{
if (_wcsicmp(params[0],L"help")==0 || _wcsicmp(params[0],L"/help")==0 || _wcsicmp(params[0],L"/h")==0 || _wcsicmp(params[0],L"/?")==0)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[4096];
if (!LoadString(hInstance,IDS_HELP,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK);
return 0;
}
if (_wcsicmp(params[0],L"extract32")==0)
extractType=x86;
if (_wcsicmp(params[0],L"extract64")==0)
extractType=x64;
if (_wcsicmp(params[0],L"extractARM64")==0)
extractType=ARM64;
if (_wcsicmp(params[0],L"/qn")==0 || _wcsicmp(params[0],L"/q")==0 || _wcsicmp(params[0],L"/quiet")==0 || _wcsicmp(params[0],L"/passive")==0)
{
bQuiet=true;
}
}
if (!pVer)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_INTERNAL,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_VERRES_NOTFOUND;
}
if (extractType != None)
{
wchar_t msiName[_MAX_PATH];
Sprintf(msiName,_countof(msiName),L"OpenShellSetup%s_%d_%d_%d.msi",(extractType==x86?L"32":(extractType==x64?L"64":L"ARM64")),HIWORD(pVer->dwProductVersionMS),LOWORD(pVer->dwProductVersionMS),HIWORD(pVer->dwProductVersionLS));
return ExtractMsi(hInstance,msiName,extractType,bQuiet);
}
// check Windows version
#pragma warning(suppress:4996)
WORD winVer=LOWORD(GetVersion());
winVer=MAKEWORD(HIBYTE(winVer),LOBYTE(winVer));
if (winVer<0x601)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_WIN7,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_WRONG_OS;
}
// dynamically link to IsWow64Process because it is not available for Windows 2000
HMODULE hKernel32=GetModuleHandle(L"kernel32.dll");
FIsWow64Process isWow64Process=(FIsWow64Process)GetProcAddress(hKernel32,"IsWow64Process");
FWow64DisableWow64FsRedirection wow64DisableWow64FsRedirection=(FWow64DisableWow64FsRedirection)GetProcAddress(hKernel32,"Wow64DisableWow64FsRedirection");
FWow64RevertWow64FsRedirection wow64RevertWow64FsRedirection=(FWow64RevertWow64FsRedirection)GetProcAddress(hKernel32,"Wow64RevertWow64FsRedirection");
if (!isWow64Process || !wow64DisableWow64FsRedirection || !wow64RevertWow64FsRedirection)
{
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_WIN7,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_WRONG_OS;
}
// Use IsWow64Process2 if it's available (Windows 10 1511+), otherwise fall back to IsWow64Process
FIsWow64Process2 isWow64Process2=(FIsWow64Process2)GetProcAddress(hKernel32,"IsWow64Process2");
if (isWow64Process2)
{
USHORT processMachine = 0, nativeMachine = 0;
isWow64Process2(GetCurrentProcess(), &processMachine, &nativeMachine);
extractType=nativeMachine==IMAGE_FILE_MACHINE_AMD64?x64:nativeMachine==IMAGE_FILE_MACHINE_ARM64?ARM64:x86;
}
else
{
BOOL x64=FALSE;
isWow64Process(GetCurrentProcess(),&x64);
extractType=x64?ExtractType::x64:x86;
}
wchar_t msiName[_MAX_PATH];
Sprintf(msiName,_countof(msiName),L"%%ALLUSERSPROFILE%%\\OpenShellSetup%s_%d_%d_%d.msi",(extractType==x86?L"32":(extractType==x64?L"64":L"ARM64")),HIWORD(pVer->dwProductVersionMS),LOWORD(pVer->dwProductVersionMS),HIWORD(pVer->dwProductVersionLS));
DoEnvironmentSubst(msiName,_countof(msiName));
int ex=ExtractMsi(hInstance,msiName,extractType,bQuiet);
if (ex) return ex;
wchar_t cmdLine[2048];
if (wcsstr(lpCmdLine,L"%MSI%") || wcsstr(lpCmdLine,L"%msi%"))
{
SetEnvironmentVariable(L"MSI",msiName);
Sprintf(cmdLine,_countof(cmdLine),L"msiexec.exe %s",lpCmdLine);
DoEnvironmentSubst(cmdLine,_countof(cmdLine));
}
else
{
Sprintf(cmdLine,_countof(cmdLine),L"msiexec.exe /i \"%s\" %s",msiName,lpCmdLine);
}
// On ARM64 we must launch msiexec.exe from system32 and not syswow64 as would otherwise happen
PVOID wow64FsRedirVal=NULL;
if (extractType == ARM64)
Wow64DisableWow64FsRedirection(&wow64FsRedirVal);
// Remember whether this interactive session had the Explorer desktop shell.
// If Restart Manager closes it during MSI processing but fails to bring it
// back, restore only the shell that was present before setup started.
const bool explorerWasRunning=IsExplorerShellRunning();
// start the installer
STARTUPINFO startupInfo={sizeof(startupInfo)};
PROCESS_INFORMATION processInfo;
memset(&processInfo,0,sizeof(processInfo));
BOOL ret=CreateProcess(NULL,cmdLine,NULL,NULL,TRUE,0,NULL,NULL,&startupInfo,&processInfo);
if (extractType == ARM64)
Wow64RevertWow64FsRedirection(wow64FsRedirVal);
if (!ret)
{
DeleteFile(msiName);
if (!bQuiet)
{
wchar_t strTitle[256];
if (!LoadString(hInstance,IDS_APP_TITLE,strTitle,_countof(strTitle))) strTitle[0]=0;
wchar_t strText[256];
if (!LoadString(hInstance,IDS_ERR_MSIEXEC,strText,_countof(strText))) strText[0]=0;
MessageBox(NULL,strText,strTitle,MB_OK|MB_ICONERROR);
}
return ERR_MSIEXEC;
}
else
{
CloseHandle(processInfo.hThread);
// wait for the installer to finish
WaitForSingleObject(processInfo.hProcess,INFINITE);
DWORD code;
GetExitCodeProcess(processInfo.hProcess,&code);
CloseHandle(processInfo.hProcess);
DeleteFile(msiName);
// Only repair the shell after a successful transaction. Reboot-required
// outcomes deliberately keep Windows Installer in control of recovery.
if (code==ERROR_SUCCESS)
RestoreExplorerShellIfNeeded(explorerWasRunning);
return code;
}
}
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