1. 多个
服务共享一个Svchost.exe进程利与弊
windows 系统
服务分为独立进程和共享进程两种，在windows NT时只有
服务器管理器SCM（Services.exe）有多个共享
服务，随着系统内置
服务的增加，在windows 2000中ms又把很多
服务做成共享方式，由svchost.exe启动。windows 2000一般有2个svchost进程，一个是RPCSS（Remote Procedure Call）
服务进程，另外一个则是由很多
服务共享的一个svchost.exe。而在windows XP中，则一般有4个以上的svchost.exe
服务进程，windows 2003 server中则更多，可以看出把更多的系统内置
服务以共享进程方式由svchost启动是ms的一个趋势。这样做在一定程度上减少了系统资源的消耗，不过也带来一定的不稳定因素，因为任何一个共享进程的
服务因为错误退出进程就会导致整个进程中的所有
服务都退出。另外就是有一点安全隐患，首先要介绍一下svchost.exe的实现机制。
2. Svchost原理
Svchost本身只是作为
服务宿主，并不实现任何
服务功能，需要Svchost启动的
服务以动态链接库形式实现，在安装这些
服务时，把
服务的可执行程序指向svchost，启动这些
服务时由svchost调用相应
服务的动态链接库来启动
服务。
那么svchost如何知道某一
服务是由哪个动态链接库负责呢？这不是由
服务的可执行程序路径中的参数部分提供的，而是
服务在注册表中的参数设置的，注册表中
服务下边有一个Parameters子键其中的ServiceDll表明该
服务由哪个动态链接库负责。并且所有这些
服务动态链接库都必须要导出一个ServiceMain()函数，用来处理
服务任务。
例如rpcss（Remote Procedure Call）在注册表中的位置是 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RpcSs，它的参数子键Parameters里有这样一项：
"ServiceDll"=REG_EXPAND_SZ:"%SystemRoot%\system32\rpcss.dll"
当启动rpcss
服务时，svchost就会调用rpcss.dll，并且执行其ServiceMain()函数执行具体
服务。
既然这些
服务是使用共享进程方式由svchost启动的，为什么系统中会有多个svchost进程呢？ms把这些
服务分为几组，同组
服务共享一个svchost进程，不同组
服务使用多个svchost进程，组的区别是由
服务的可执行程序后边的参数决定的。
例如rpcss在注册表中 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RpcSs 有这样一项：
"ImagePath"=REG_EXPAND_SZ:"%SystemRoot%\system32\svchost -k rpcss"
因此rpcss就属于rpcss组，这在
服务管理控制台也可以看到。
svchost的所有组和组内的所有
服务都 在注册表的如下位置： HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT \CurrentVersion\Svchost，例如windows 2000共有4组rpcss、netsvcs、wugroup、 BITSgroup，其中最多的就是 netsvcs=REG_MULTI_SZ:EventSystem.Ias.Iprip.Irmon.Netman.Nwsapagent.Rasauto.\
Rasman.Remoteaccess.SENS.Sharedaccess.Tapisrv.Ntmssvc.wzcsvc..
在启动一个svchost.exe负责的
服务时，
服务管理器如果遇到可执行程序内容ImagePath已经存在于
服务管理器的映象库中，就不在启动第2个进程svchost，而是直接启动
服务。这样就实现了多个
服务共享一个svchost进程。
3. Svchost代码
现在我们基本清楚svchost的原理了，但是要自己写一个DLL形式的
服务， 由svchost来启动，仅有上边的信息还有些问题不是很清楚。比如我们在导出的ServiceMain()函数中接收的参数是ANSI还是 Unicode？我们是否需要调用RegisterServiceCtrlHandler和StartServiceCtrlDispatcher来注册
服务控制及调度函数？
这些问题要通过查看svchost代码获得。下边的代码是windows 2000+ service pack 4 的svchost反汇编片段，可以看出svchost程序还是很简单的。
主函数首先调用ProcCommandLine()对命令行进行分析，获得要启动的
服务组，然后调用SvcHostOptions()查询该
服务组的选项和
服务组的所有
服务，并使用一个
数据结构 svcTable 来保存这些
服务及其
服务的 DLL，然后调用PrepareSvcTable() 函数创建SERVICE_TABLE_ENTRY 结构，把所有处理函数 SERVICE_MAIN_FUNCTION 指向自己的一个函数FuncServiceMain()，最后调用 API StartServiceCtrlDispatcher() 注册这些
服务的调度函数。
; =============================== Main Funcion ===========================================
.text:010010B8 public start
.text:010010B8 start proc near
.text:010010B8 push esi
.text:010010B9 push edi
.text:010010BA push offset sub_1001EBA ; lpTopLevelExceptionFilter
.text:010010BF xor edi, edi
.text:010010C1 call ds:setUnhandledExceptionFilter
.text:010010C7 push 1 ; uMode
.text:010010C9 call ds:setErrorMode
.text:010010CF call ds:GetProcessHeap
.text:010010D5 push eax
.text:010010D6 call sub_1001142
.text:010010DB mov eax, offset dword_1003018
.text:010010E0 push offset unk_1003000 ; lpCriticalSection
.text:010010E5 mov dword_100301C, eax
.text:010010EA mov dword_1003018, eax
.text:010010EF call ds:InitializeCriticalSection
.text:010010F5 call ds:GetCommandLineW
.text:010010FB push eax ; lpString
.text:010010FC call ProcCommandLine
.text:01001101 mov esi, eax
.text:01001103 test esi, esi
.text:01001105 jz short lab_doservice
.text:01001107 push esi
.text:01001108 call SvcHostOptions
.text:0100110D call PrepareSvcTable
.text:01001112 mov edi, eax ; SERVICE_TABLE_ENTRY returned
.text:01001114 test edi, edi
.text:01001116 jz short loc_1001128
.text:01001118 mov eax, [esi+10h]
.text:0100111B test eax, eax
.text:0100111D jz short loc_1001128
.text:0100111F push dword ptr [esi+14h] ; dwCapabilities
.text:01001122 push eax ; int
.text:01001123 call InitializeSecurity
.text:01001128
.text:01001128 loc_1001128: ; CODE XREF: start+5E j
.text:01001128 ; start+65 j
.text:01001128 push esi ; lpMem
.text:01001129 call HeapFreeMem
.text:0100112E
.text:0100112E lab_doservice: ; CODE XREF: start+4D j
.text:0100112E test edi, edi
.text:01001130 jz ExitProgram
.text:01001136 push edi ; lpServiceStartTable
.text:01001137 call ds:startServiceCtrlDispatcherW
.text:0100113D jmp ExitProgram
.text:0100113D start endp
; =============================== Main Funcion end ===========================================
由于svchost为该组的所有
服务都注册了svchost中的一个处理函数，因此每次启动任何一个
服务时，
服务管理器SCM都会调用FuncServiceMain() 这个函数。这个函数使用 svcTable 查询要启动的
服务使用的DLL，调用DLL导出的ServiceMain()函数来启动
服务，然后返回。
; ============================== FuncServiceMain() ===========================================
.text:01001504 FuncServiceMain proc near ; DATA XREF: PrepareSvcTable+44 o
.text:01001504
.text:01001504 arg_0 = dword ptr 8
.text:01001504 arg_4 = dword ptr 0Ch
.text:01001504
.text:01001504 push ecx
.text:01001505 mov eax, [esp+arg_4]
.text:01001509 push ebx
.text:0100150A push ebp
.text:0100150B push esi
.text:0100150C mov ebx, offset unk_1003000
.text:01001511 push edi
.text:01001512 mov edi, [eax]
.text:01001514 push ebx
.text:01001515 xor ebp, ebp
.text:01001517 call ds:EnterCriticalSection
.text:0100151D xor esi, esi
.text:0100151F cmp dwGroupSize, esi
.text:01001525 jbe short loc_1001566
.text:01001527 and [esp+10h], esi
.text:0100152B
.text:0100152B loc_100152B: ; CODE XREF: FuncServiceMain+4A j
.text:0100152B mov eax, svcTable
.text:01001530 mov ecx, [esp+10h]
.text:01001534 push dword ptr [eax+ecx]
.text:01001537 push edi
.text:01001538 call ds:lstrcmpiW
.text:0100153E test eax, eax
.text:01001540 jz short StartThis
.text:01001542 add dword ptr [esp+10h], 0Ch
.text:01001547 inc esi
.text:01001548 cmp esi, dwGroupSize
.text:0100154E jb short loc_100152B
.text:01001550 jmp short loc_1001566
.text:01001552 ; =================================================
.text:01001552
.text:01001552 StartThis: ; CODE XREF: FuncServiceMain+3C j
.text:01001552 mov ecx, svcTable
.text:01001558 lea eax, [esi+esi*2]
.text:0100155B lea eax, [ecx+eax*4]
.text:0100155E push eax
.text:0100155F call GetDLLServiceMain
.text:01001564 mov ebp, eax ; dll ServiceMain Function address
.text:01001566
.text:01001566 loc_1001566: ; CODE XREF: FuncServiceMain+21 j
.text:01001566 ; FuncServiceMain+4C j
.text:01001566 push ebx
.text:01001567 call ds:LeaveCriticalSection
.text:0100156D test ebp, ebp
.text:0100156F jz short loc_100157B
.text:01001571 push [esp+10h+arg_4]
.text:01001575 push [esp+14h+arg_0]
.text:01001579 call ebp
.text:0100157B
.text:0100157B loc_100157B: ; CODE XREF: FuncServiceMain+6B j
.text:0100157B pop edi
.text:0100157C pop esi
.text:0100157D pop ebp
.text:0100157E pop ebx
.text:0100157F pop ecx
.text:01001580 retn 8
.text:01001580 FuncServiceMain endp ; sp = -8
; ============================== FuncServiceMain() end ========================================
由于svchost已经调用了StartServiceCtrlDispatcher来
服务调 度函数，因此我们在实现DLL实现时就不用了，这主要是因为一个进程只能调用一次StartServiceCtrlDispatcher API。但是需 要用 RegisterServiceCtrlHandler 来注册响应控制请求的函数。最后我们的DLL接收的都是unicode字符串。
由于这种
服务启动后由svchost加载，不增加新的进程，只是svchost的一个DLL，而且一般进行审计时都不会去HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost 检查
服务组是否变化，就算去检查，也不一定能发现异常，因此如果添加一个这样的DLL后门，伪装的好，是比较隐蔽的。
4. 安装
服务与设置
要通过svchost调用来启动的
服务，就一定要在HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost下有该
服务名，这可以通过如下方式来实现：
1） 添加一个新的
服务组，在组里添加
服务名
2） 在现有组里添加
服务名
3） 直接使用现有
服务组里的一个
服务名，但本机没有安装的
服务
4） 修改现有
服务组里的现有
服务，把它的ServiceDll指向自己
其中前两种可以被正常
服务使用，如使用第1种方式，启动其
服务要创建新的svchost进程；第2种方式如果该组
服务已经运行，安装后不能立刻启动
服务，因为svchost启动后已经把该组信息保存在内存里，并调用API StartServiceCtrlDispatcher() 为该组所有
服务注册了调度处理函数，新增加的
服务不能再注册调度处理函数，需要重起计算机或者该组的svchost进程。而后两种可能被后门使用，尤其是最后一种，没有添加
服务，只是改了注册表里一项设置，从
服务管理控制台又看不出来，如果作为后门还是很隐蔽的。比如EventSystem
服务，缺省是指向es.dll，如果把ServiceDll改为EventSystem.dll就很难发现。
因此
服务的安装除了调用CreateService()创建
服务之外，还需要设置
服务的ServiceDll，如果使用前2种还要设置svchost的注册表选项，在卸载时也最好删除增加的部分。
具体代码参见后边的附例（使用的是方法3）。
注： ImagePath 和ServiceDll 是ExpandString不是普通字符串。因此如果使用.reg文件安装时要注意。
5. DLL
服务实现
DLL程序的编写比较简单，只要实现一个ServiceMain()函数和一个
服务控制程序，在ServiceMain()函数里用RegisterServiceCtrlHandler()注册
服务控制程序，并设置
服务的运行状态就可以了。
另外，因为此种
服务的安装除了正常的CreateService()之外，还要进行其他设置，因此最好实现安装和卸载函数。
为了方便安装，实现的代码提供了InstallService()函数进行安装，这个函数可以接收
服务名作为参数（如果不提供参数，就使用缺省的iprip），如果要安装的
服务不在svchost的netsvcs组里安装就会失败；如果要安装的
服务已经存在，安装也会失败；安装成功后程序会配置
服务的ServiceDll为当前Dll。提供的UninstallService()函数，可以删除任何函数而没有进行任何检查。
为了方便使用rundll32.exe进行安装，还提供了RundllInstallA()和RundllUninstallA()分别调用InstallService()及UninstallService()。因为rundll32.exe使用的函数原型是：
void CALLBACK FunctionName(
HWND hwnd, // handle to owner window
HINSTANCE hinst, // instance handle for the DLL
LPTSTR lpCmdLine, // string the DLL will parse
int nCmdShow // show state
);
对应的命令行是rundll32 DllName,FunctionName [Arguments]
DLL
服务本身只是创建一个进程，该程序命令行就是启动
服务时提供的第一个参数，如果未指定就使用缺省的svchostdll.exe。启动
服务时如果提供第二个参数，创建的进程就是和桌面交互的。
具体代码参见后边的附例8，源代码和DLL文件请到http://www.binglesite.net下载。
//main service process function
void __stdcall ServiceMain( int argc, wchar_t* argv[] );
//report service stat to the service control manager
int TellSCM( DWORD dwState, DWORD dwExitCode, DWORD dwProgress );
//service control handler, call back by service control manager
void __stdcall ServiceHandler( DWORD dwCommand );
//RealService just create a process
int RealService(char *cmd, int bInteract);
//Install this dll as a Service host by svchost.exe, service name is given by caller
int InstallService(char *name);
//unInstall a Service, be CARE FOR call this to delete a service
int UninstallService(char *name);
//Install this dll as a Service host by svchost.exe, used by RUNDLL32.EXE to call
void CALLBACK RundllInstallA(HWND hwnd, HINSTANCE hinst, char *param, int nCmdShow);
//unInstall a Service used by RUNDLL32.EXE to call, be CARE FOR call this to delete a service
void CALLBACK RundllUninstallA(HWND hwnd, HINSTANCE hinst, char *param, int nCmdShow);
//output the debug infor into log file(or stderr if a console program call me) & DbgPrint
void OutputString( char *lpFmt, ... );
6. 代码使用
C:\>tlist -s
0 System Process
8 System
240 services.exe Svcs: Browser,Dhcp,dmserver,Dnscache,Eventlog,lanmanserver,lanmanworkstation, LmHosts,PlugPlay,ProtectedStorage,TrkWks,Wmi
504 svchost.exe Svcs: RpcSs
1360 svchost.exe Svcs: EventSystem,Netman,RasMan,SENS,TapiSrv
C:\>rundll32 svchostdll.dll,RundllInstall abcd
SvcHostDLL: DllMain called DLL_PROCESS_ATTACH
you specify service name not in Svchost\netsvcs, must be one of following:
- EventSystem
- Ias
- Iprip
- Irmon
- Netman
- Nwsapagent
- Rasauto
- Rasman
- Remoteaccess
- SENS
- Sharedaccess
- Tapisrv
- Ntmssvc
- wzcsvc
C:\>rundll32 svchostdll.dll,RundllInstall IPRIP
SvcHostDLL: DllMain called DLL_PROCESS_ATTACH
CreateService(IPRIP) SUCCESS. Config it
Config service IPRIP ok.
C:\>sc start iprip "cmd /k whoami" 1
NT AUTHORITY\SYSTEM
SvcHostDLL: ServiceMain(3, IPRIP) called
SvcHostDLL: RealService called 'cmd /k whoami' Interact
SvcHostDLL: CreateProcess(cmd /k whoami) to 640
C:\>tlist -s
0 System Process
8 System
240 services.exe Svcs: Browser,Dhcp,dmserver,Dnscache,Eventlog,lanmanserver,lanmanworkstation, LmHosts,PlugPlay,ProtectedStorage,TrkWks,Wmi
504 svchost.exe Svcs: RpcSs
640 cmd.exe Title: C:\WINNT\System32\cmd.exe
1360 svchost.exe Svcs: EventSystem,Netman,RasMan,SENS,TapiSrv,IPRIP
C:\>net stop iprip
The IPRIP service was stopped successfully.
C:\>rundll32 svchostdll.dll,RundllUninstall iprip
DeleteService(IPRIP) SUCCESS.
7. 参考
Platform SDK: Tools - Rundll32
1） Inside Win32 Services, Part 2 by: Mark Russinovich, at: http://www.winnetmag.com/Articles/Index.cfm?ArticleID=8943&pg=3
2） Platform SDK: Tools - Rundll32, at: http://msdn.microsoft.com/library/en-us/tools/tools/rundll32.asp
2003/8
8. 代码
// SvcHostDLL.cpp : Demo for a service dll used by svchost.exe to host it.
//
// for detail comment see articles.
// by bingle_at_email.com.cn
// www.BingleSite.net
//
/* save following as a .def file to export function, only ServiceMain is needed.
other used to install & uninstall service.
or use /EXPORT: link option to export them.
EXPORTS
ServiceMain
InstallService
UninstallService
RundllUninstallA
RundllInstallA
*/
/*
To compile & link:
cl /MD /GX /LD svchostdll.cpp /link
advapi32.lib /DLL /base:0x71000000 /export:serviceMain
/EXPORT:RundllUninstallA /EXPORT:RundllInstallA
/EXPORT:InstallService /EXPORT:UninstallService
*/
//
// Articles:
// 1. HOWTO Create a service dll used by svchost.exe by bingle, at: http://www.BingleSite.net/article/svchost-dll-service.html
// 2. Inside Win32 Services, Part 2 by: Mark Russinovich, at: http://www.winnetmag.com/Articles/Index.cfm?ArticleID=8943&pg=3
// 3. Platform SDK: Tools - Rundll32, at: http://msdn.microsoft.com/library/en-us/tools/tools/rundll32.asp
#include <stdio.h>
#include <time.h>
#include <assert.h>
#include <windows.h>
#define DEFAULT_SERVICE "IPRIP"
#define MY_EXECUTE_NAME "SvcHostDLL.exe"
//main service process function
void __stdcall ServiceMain( int argc, wchar_t* argv[] );
//report service stat to the service control manager
int TellSCM( DWORD dwState, DWORD dwExitCode, DWORD dwProgress );
//service control handler, call back by service control manager
void __stdcall ServiceHandler( DWORD dwCommand );
//RealService just create a process
int RealService(char *cmd, int bInteract);
//Install this dll as a Service host by svchost.exe, service name is given by caller
int InstallService(char *name);
//unInstall a Service, be CARE FOR call this to delete a service
int UninstallService(char *name);
//Install this dll as a Service host by svchost.exe, used by RUNDLL32.EXE to call
void CALLBACK RundllInstallA(HWND hwnd, HINSTANCE hinst, char *param, int nCmdShow);
//unInstall a Service used by RUNDLL32.EXE to call, be CARE FOR call this to delete a service
void CALLBACK RundllUninstallA(HWND hwnd, HINSTANCE hinst, char *param, int nCmdShow);
//output the debug infor into log file(or stderr if a console program call me) & DbgPrint
void OutputString( char *lpFmt, ... );
//dll module handle used to get dll path in InstallService
HANDLE hDll = NULL;
//Service HANDLE & STATUS used to get service state
SERVICE_STATUS_HANDLE hSrv;
DWORD dwCurrState;
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
hDll = hModule;
#ifdef _DEBUG
AllocConsole();
OutputString("SvcHostDLL: DllMain called DLL_PROCESS_ATTACH");
break;
case DLL_THREAD_ATTACH:
OutputString("SvcHostDLL: DllMain called DLL_THREAD_ATTACH");
case DLL_THREAD_DETACH:
OutputString("SvcHostDLL: DllMain called DLL_THREAD_DETACH");
case DLL_PROCESS_DETACH:
TellSCM( SERVICE_STOP_PENDING, 0, 0 );
Sleep(1500);
TellSCM( SERVICE_STOPPED, 0, 0 );
OutputString("SvcHostDLL: DllMain called DLL_PROCESS_DETACH");
#endif
break;
}
return TRUE;
}
void __stdcall ServiceMain( int argc, wchar_t* argv[] )
{
// DebugBreak();
char svcname[256];
strncpy(svcname, (char*)argv[0], sizeof svcname); //it's should be unicode, but if it's ansi we do it well
wcstombs(svcname, argv[0], sizeof svcname);
OutputString("SvcHostDLL: ServiceMain(%d, %s) called", argc, svcname);
hSrv = RegisterServiceCtrlHandler( svcname, (LPHANDLER_FUNCTION)ServiceHandler );
if( hSrv == NULL )
{
OutputString("SvcHostDLL: RegisterServiceCtrlHandler %S failed", argv[0]);
return;
}else FreeConsole();
TellSCM( SERVICE_START_PENDING, 0, 1 );
TellSCM( SERVICE_RUNNING, 0, 0 );
// call Real Service function noew
if(argc > 1)
strncpy(svcname, (char*)argv[1], sizeof svcname),
wcstombs(svcname, argv[1], sizeof svcname);
RealService(argc > 1 ? svcname : MY_EXECUTE_NAME, argc > 2 ? 1 : 0);
do{
Sleep(10);//not quit until receive stop command, otherwise the service will stop
}while(dwCurrState != SERVICE_STOP_PENDING && dwCurrState != SERVICE_STOPPED);
OutputString("SvcHostDLL: ServiceMain done");
return;
}
int TellSCM( DWORD dwState, DWORD dwExitCode, DWORD dwProgress )
{
SERVICE_STATUS srvStatus;
srvStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
srvStatus.dwCurrentState = dwCurrState = dwState;
srvStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_PAUSE_CONTINUE | SERVICE_ACCEPT_SHUTDOWN;
srvStatus.dwWin32ExitCode = dwExitCode;
srvStatus.dwServiceSpecificExitCode = 0;
srvStatus.dwCheckPoint = dwProgress;
srvStatus.dwWaitHint = 3000;
return SetServiceStatus( hSrv, &srvStatus );
}
void __stdcall ServiceHandler( DWORD dwCommand )
{
// not really necessary because the service stops quickly
switch( dwCommand )
{
case SERVICE_CONTROL_STOP:
TellSCM( SERVICE_STOP_PENDING, 0, 1 );
OutputString("SvcHostDLL: ServiceHandler called SERVICE_CONTROL_STOP");
Sleep(10);
TellSCM( SERVICE_STOPPED, 0, 0 );
break;
case SERVICE_CONTROL_PAUSE:
TellSCM( SERVICE_PAUSE_PENDING, 0, 1 );
OutputString("SvcHostDLL: ServiceHandler called SERVICE_CONTROL_PAUSE");
TellSCM( SERVICE_PAUSED, 0, 0 );
break;
case SERVICE_CONTROL_CONTINUE:
TellSCM( SERVICE_CONTINUE_PENDING, 0, 1 );
OutputString("SvcHostDLL: ServiceHandler called SERVICE_CONTROL_CONTINUE");
TellSCM( SERVICE_RUNNING, 0, 0 );
break;
case SERVICE_CONTROL_INTERROGATE:
OutputString("SvcHostDLL: ServiceHandler called SERVICE_CONTROL_INTERROGATE");
TellSCM( dwCurrState, 0, 0 );
break;
case SERVICE_CONTROL_SHUTDOWN:
OutputString("SvcHostDLL: ServiceHandler called SERVICE_CONTROL_SHUTDOWN");
TellSCM( SERVICE_STOPPED, 0, 0 );
break;
}
}
//RealService just create a process
int RealService(char *cmd, int bInteract)
{
OutputString("SvcHostDLL: RealService called '%s' %s", cmd, bInteract ? "Interact" : "");
STARTUPINFO si = {0};
PROCESS_INFORMATION pi;
si.cb = sizeof si;
if(bInteract) si.lpDesktop = "WinSta0\\Default";
if(!CreateProcess(NULL, cmd, NULL, NULL, false, 0, NULL, NULL, &si, &pi))
OutputString("SvcHostDLL: CreateProcess(%s) error:%d", cmd, GetLastError());
else OutputString("SvcHostDLL: CreateProcess(%s) to %d", cmd, pi.dwProcessId);
return 0;
}
int InstallService(char *name)
{
// Open a handle to the SC Manager database.
int rc = 0;
HKEY hkRoot = HKEY_LOCAL_MACHINE, hkParam = 0;
SC_HANDLE hscm = NULL, schService = NULL;
try{
char buff[500];
char *svcname = DEFAULT_SERVICE;
if(name && name[0]) svcname = name;
//query svchost setting
char *ptr, *pSvchost = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Svchost";
rc = RegOpenKeyEx(hkRoot, pSvchost, 0, KEY_QUERY_VALUE, &hkRoot);
if(ERROR_SUCCESS != rc)
{
OutputString("RegOpenKeyEx(%s) KEY_QUERY_VALUE error %d.", pSvchost, rc);
throw "";
}
DWORD type, size = sizeof buff;
rc = RegQueryValueEx(hkRoot, "netsvcs", 0, &type, (unsigned char*)buff, &size);
RegCloseKey(hkRoot);
SetLastError(rc);
if(ERROR_SUCCESS != rc)
throw "RegQueryValueEx(Svchost\\netsvcs)";
for(ptr = buff; *ptr; ptr = strchr(ptr, 0)+1)
if(stricmp(ptr, svcname) == 0) break;
if(*ptr == 0)
{
OutputString("you specify service name not in Svchost\\netsvcs, must be one of following:");
for(ptr = buff; *ptr; ptr = strchr(ptr, 0)+1)
OutputString(" - %s", ptr);
throw "";
}
//install service
hscm = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
if (hscm == NULL)
throw "OpenSCManager()";
char *bin = "%SystemRoot%\\System32\\svchost.exe -k netsvcs";
schService = CreateService(
hscm, // SCManager database
svcname, // name of service
NULL, // service name to display
SERVICE_ALL_ACCESS, // desired access
SERVICE_WIN32_SHARE_PROCESS, // service type
SERVICE_AUTO_START, // start type
SERVICE_ERROR_NORMAL, // error control type
bin, // service's binary
NULL, // no load ordering group
NULL, // no tag identifier
NULL, // no dependencies
NULL, // LocalSystem account
NULL); // no password
if (schService == NULL)
{
OutputString("CreateService(%s) error %d", svcname, rc = GetLastError());
throw "";
}
OutputString("CreateService(%s) SUCCESS. Config it", svcname);
CloseServiceHandle(schService);
CloseServiceHandle(hscm);
//config service
hkRoot = HKEY_LOCAL_MACHINE;
strncpy(buff, "SYSTEM\\CurrentControlSet\\Services\\", sizeof buff);
strncat(buff, svcname, 100);
rc = RegOpenKeyEx(hkRoot, buff, 0, KEY_ALL_ACCESS, &hkRoot);
if(ERROR_SUCCESS != rc)
{
OutputString("RegOpenKeyEx(%s) KEY_SET_VALUE error %d.", svcname, rc);
throw "";
}
rc = RegCreateKey(hkRoot, "Parameters", &hkParam);
SetLastError(rc);
if(ERROR_SUCCESS != rc)
throw "RegCreateKey(Parameters)";
if(!GetModuleFileName(HMODULE(hDll), buff, sizeof buff))
throw "GetModuleFileName() get dll path";
rc = RegSetValueEx(hkParam, "ServiceDll", 0, REG_EXPAND_SZ, (unsigned char*)buff, strlen(buff)+1);
SetLastError(rc);
if(ERROR_SUCCESS != rc)
throw "RegSetValueEx(ServiceDll)";
OutputString("Config service %s ok.", svcname);
}catch(char *str)
{
if(str && str[0])
{
rc = GetLastError();
OutputString("%s error %d", str, rc);
}
}
RegCloseKey(hkRoot);
RegCloseKey(hkParam);
CloseServiceHandle(schService);
CloseServiceHandle(hscm);
return rc;
}
/*
used to install by rundll32.exe
Platform SDK: Tools - Rundll32
The Run DLL utility (Rundll32.exe) included in Windows enables you to call functions exported from a 32-bit DLL. These functions must have the following syntax:
*/
void CALLBACK RundllInstallA(
HWND hwnd, // handle to owner window
HINSTANCE hinst, // instance handle for the DLL
char *param, // string the DLL will parse
int nCmdShow // show state
)
{
InstallService(param);
}
int UninstallService(char *name)
{
int rc = 0;
SC_HANDLE schService;
SC_HANDLE hscm;
__try{
hscm = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
if (hscm == NULL)
{
OutputString("OpenSCManager() error %d", rc = GetLastError() );
return rc;
}
char *svcname = DEFAULT_SERVICE;
if(name && name[0]) svcname = name;
schService = OpenService(hscm, svcname, DELETE);
if (schService == NULL)
{
OutputString("OpenService(%s) error %d", svcname, rc = GetLastError() );
return rc;
}
if (!DeleteService(schService) )
{
OutputString("OpenService(%s) error %d", svcname, rc = GetLastError() );
return rc;
}
OutputString("DeleteService(%s) SUCCESS.", svcname);
}__except(1)
{
OutputString("Exception Catched 0x%X", GetExceptionCode());
}
CloseServiceHandle(schService);
CloseServiceHandle(hscm);
return rc;
}
/*
used to uninstall by rundll32.exe
Platform SDK: Tools - Rundll32
The Run DLL utility (Rundll32.exe) included in Windows enables you to call functions exported from a 32-bit DLL. These functions must have the following syntax:
*/
void CALLBACK RundllUninstallA(
HWND hwnd, // handle to owner window
HINSTANCE hinst, // instance handle for the DLL
char *param, // string the DLL will parse
int nCmdShow // show state
)
{
UninstallService(param);
}
//output the debug infor into log file & DbgPrint
void OutputString( char *lpFmt, ... )
{
char buff[1024];
va_list arglist;
va_start( arglist, lpFmt );
_vsnprintf( buff, sizeof buff, lpFmt, arglist );
va_end( arglist );
DWORD len;
HANDLE herr = GetStdHandle(STD_OUTPUT_HANDLE);
if(herr != INVALID_HANDLE_VALUE)
{
WriteFile(herr, buff, strlen(buff), &len, NULL);
WriteFile(herr, "\r\n", 2, &len, NULL);
}else
{
FILE *fp = fopen("SvcHost.DLL.log", "a");
if(fp)
{
char date[20], time[20];
fprintf(fp, "%s %s - %s\n", _strdate(date), _strtime(time), buff);
if(!stderr) fclose(fp);
}
}
OutputDebugString(buff);
}
