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/*
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* win-scm.c - windows service control manager functions
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*
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* Copyright (c) 2008 Hamish Coleman <hamish@zot.org>
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* 2003 Benjamin Schweizer <gopher at h07 dot org>
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* 1998 Stephen Early <Stephen.Early@cl.cam.ac.uk>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <windows.h>
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#include <winsvc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "scm.h"
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/* Service status: our current status, and handle on service manager */
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SERVICE_STATUS svcStatus;
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SERVICE_STATUS_HANDLE svcHandle;
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/* global pointer to our service definition */
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struct SCM_def *global_sd;
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VOID WINAPI ServiceCtrlHandler(DWORD opcode) {
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svcStatus.dwWin32ExitCode = NO_ERROR;
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if (opcode == SERVICE_CONTROL_STOP) {
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svcStatus.dwCurrentState = SERVICE_STOP_PENDING;
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SetServiceStatus( svcHandle, &svcStatus );
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global_sd->stop(NULL);
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return;
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}
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SetServiceStatus( svcHandle, &svcStatus );
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}
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VOID WINAPI ServiceMain(DWORD argc, LPSTR *argv)
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{
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int err;
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/*
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* TODO
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* - work out a race-free way to determine the correct sd ptr
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* - once the correct sd is known, a void* could be passed to all the
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* service functions, allowing the service to know
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*/
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struct SCM_def *sd = global_sd;
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/* TODO - use RegisterServiceCtrlHandlerEx and pass the sd to it? */
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svcHandle = RegisterServiceCtrlHandler(sd->name,ServiceCtrlHandler);
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if (!svcHandle) {
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/* FIXME - use SvcReportEvent() */
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printf("RegisterServiceCtrlHandler failed %u\n",
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(unsigned int)GetLastError());
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return;
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}
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svcStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
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svcStatus.dwCurrentState = 0;
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svcStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;
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svcStatus.dwWin32ExitCode = NO_ERROR;
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svcStatus.dwServiceSpecificExitCode = 0;
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svcStatus.dwCheckPoint = 0;
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svcStatus.dwWaitHint = 5000;
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/* Report initial status to the SCM. */
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svcStatus.dwCurrentState = SERVICE_START_PENDING;
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SetServiceStatus( svcHandle, &svcStatus );
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/*
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* If there is only one SCM arg, it is just the servicename, so use
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* the original cmdline instead.
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* Otherwise, let the SCM args completely override the original ones
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*/
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if (argc==1) {
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argc=sd->argc;
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argv=sd->argv;
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}
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sd->mode=SVC_OK;
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if (sd->init) {
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if ((err=sd->init(argc,argv))!=0) {
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svcStatus.dwCurrentState = SERVICE_STOPPED;
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svcStatus.dwWin32ExitCode = err;
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SetServiceStatus( svcHandle, &svcStatus );
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return;
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}
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}
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svcStatus.dwCurrentState = SERVICE_RUNNING;
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svcStatus.dwWin32ExitCode = NO_ERROR;
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SetServiceStatus( svcHandle, &svcStatus );
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err=sd->main(argc,argv);
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svcStatus.dwCurrentState = SERVICE_STOPPED;
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svcStatus.dwWin32ExitCode = NO_ERROR;
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SetServiceStatus( svcHandle, &svcStatus );
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return;
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}
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int SCM_Start_Console(struct SCM_def *sd) {
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sd->mode=SVC_CONSOLE;
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int err;
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if (sd->init) {
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err = sd->init(sd->argc,sd->argv);
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if (err!=0) {
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return SVC_FAIL;
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}
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}
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sd->main(sd->argc,sd->argv);
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return SVC_OK;
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}
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int SCM_Start(struct SCM_def *sd, int argc, char **argv) {
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SERVICE_TABLE_ENTRY ServiceTable[] = {
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{ "", ServiceMain },
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{ NULL, NULL }
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};
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/* save the cmdline for possible use later */
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sd->argc=argc;
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sd->argv=argv;
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global_sd = sd;
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/*
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* Attempt to detect if we have been run from an interactive session.
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* checking the environ is still not perfect, since if the
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* service is set to login as a user, it gets a USERNAME env
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* and if that user is currently logged in interactively, it
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* gets a SESSIONNAME env :-(
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* So, also check if there is a console window
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*
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* Other avenues of investigation:
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* from http://bytes.com/topic/net/answers/124885-multiple-use-exe-determine-if-running-service
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* - work out how System.Environment.UserInteractive works
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* - Check if parent process name is "services.exe"
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* from http://stackoverflow.com/questions/200163/am-i-running-as-a-service#200183
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*/
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char buf[100];
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if (getenv("USERNAME") && getenv("SESSIONNAME")
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&& GetConsoleTitle((LPTSTR)&buf,sizeof(buf))) {
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return SCM_Start_Console(sd);
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}
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/* try to run as a service */
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/*
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* Note, this will eventually fail if we are not started as a service
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* however, it will take an noticably long time to do so, thus we
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* try to short circuit this delay above.
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*/
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if (StartServiceCtrlDispatcher(ServiceTable)==0) {
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int err = GetLastError();
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if (err == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
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return SCM_Start_Console(sd);
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}
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/* any other error, assume fatal */
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printf("StartServiceCtrlDispatcher failed %d\n", err);
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return SVC_FAIL;
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}
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return SVC_OK;
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}
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char *SCM_Install(struct SCM_def *sd, char *args) {
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SC_HANDLE schSCManager, schService;
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static char path[MAX_PATH];
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if( !GetModuleFileName( NULL, path, MAX_PATH ) ) {
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printf("GetModuleFileName failed %u\n",
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(unsigned int)GetLastError());
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return NULL;
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}
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/*
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* Note - the above path calculation does not work for paths containing
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* spaces. This is because Windows is stupid, mosttly due to bad
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* design - see the next below.
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*/
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static char cmdline[MAX_PATH+10];
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if (args) {
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/*
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* The "BinaryPathName" can also have cmdline params
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* embedded into it. Stupid windows
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*/
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snprintf(cmdline,sizeof(cmdline),"\"%s\" %s",path,args);
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} else {
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snprintf(cmdline,sizeof(cmdline),"\"%s\"",path);
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}
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schSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
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schService = CreateService(
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schSCManager,
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sd->name,
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sd->desc,
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SERVICE_ALL_ACCESS,
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SERVICE_WIN32_OWN_PROCESS,
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SERVICE_AUTO_START,
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SERVICE_ERROR_NORMAL,
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cmdline,
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NULL, NULL, NULL, NULL, NULL);
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if (schService == NULL) {
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printf("CreateService failed\n");
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CloseServiceHandle(schService);
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return NULL;
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}
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CloseServiceHandle(schService);
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return (char *)&path;
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}
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int SCM_Remove(struct SCM_def *sd) {
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SC_HANDLE schSCManager, schService;
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schSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
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if (schSCManager == NULL) {
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printf("Couldn't open service manager\n");
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return -1;
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}
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schService = OpenService(schSCManager, sd->name, DELETE);
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if (schService == NULL) {
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printf("Couldn't open %s service\n",sd->name);
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return -1;
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}
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if (!DeleteService(schService)) {
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printf("Couldn't delete %s service\n",sd->name);
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return -1;
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}
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CloseServiceHandle(schService);
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return 0;
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}
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