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Sweden-Number/programs/services/services.c

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/*
* Services - controls services keeps track of their state
*
* Copyright 2007 Google (Mikolaj Zalewski)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#define WIN32_LEAN_AND_MEAN
#include <stdarg.h>
#include <windows.h>
#include <winsvc.h>
#include <rpc.h>
#include "wine/unicode.h"
#include "wine/debug.h"
#include "svcctl.h"
#include "services.h"
#define MAX_SERVICE_NAME 260
WINE_DEFAULT_DEBUG_CHANNEL(service);
HANDLE g_hStartedEvent;
struct scmdatabase *active_database;
static const WCHAR SZ_LOCAL_SYSTEM[] = {'L','o','c','a','l','S','y','s','t','e','m',0};
/* Registry constants */
static const WCHAR SZ_SERVICES_KEY[] = { 'S','y','s','t','e','m','\\',
'C','u','r','r','e','n','t','C','o','n','t','r','o','l','S','e','t','\\',
'S','e','r','v','i','c','e','s',0 };
/* Service key values names */
static const WCHAR SZ_DISPLAY_NAME[] = {'D','i','s','p','l','a','y','N','a','m','e',0 };
static const WCHAR SZ_TYPE[] = {'T','y','p','e',0 };
static const WCHAR SZ_START[] = {'S','t','a','r','t',0 };
static const WCHAR SZ_ERROR[] = {'E','r','r','o','r','C','o','n','t','r','o','l',0 };
static const WCHAR SZ_IMAGE_PATH[] = {'I','m','a','g','e','P','a','t','h',0};
static const WCHAR SZ_GROUP[] = {'G','r','o','u','p',0};
static const WCHAR SZ_DEPEND_ON_SERVICE[] = {'D','e','p','e','n','d','O','n','S','e','r','v','i','c','e',0};
static const WCHAR SZ_DEPEND_ON_GROUP[] = {'D','e','p','e','n','d','O','n','G','r','o','u','p',0};
static const WCHAR SZ_OBJECT_NAME[] = {'O','b','j','e','c','t','N','a','m','e',0};
static const WCHAR SZ_TAG[] = {'T','a','g',0};
static const WCHAR SZ_DESCRIPTION[] = {'D','e','s','c','r','i','p','t','i','o','n',0};
DWORD service_create(LPCWSTR name, struct service_entry **entry)
{
*entry = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(**entry));
if (!*entry)
return ERROR_NOT_ENOUGH_SERVER_MEMORY;
(*entry)->name = strdupW(name);
if (!(*entry)->name)
{
HeapFree(GetProcessHeap(), 0, *entry);
return ERROR_NOT_ENOUGH_SERVER_MEMORY;
}
(*entry)->control_pipe = INVALID_HANDLE_VALUE;
return ERROR_SUCCESS;
}
void free_service_entry(struct service_entry *entry)
{
HeapFree(GetProcessHeap(), 0, entry->name);
HeapFree(GetProcessHeap(), 0, entry->config.lpBinaryPathName);
HeapFree(GetProcessHeap(), 0, entry->config.lpDependencies);
HeapFree(GetProcessHeap(), 0, entry->config.lpLoadOrderGroup);
HeapFree(GetProcessHeap(), 0, entry->config.lpServiceStartName);
HeapFree(GetProcessHeap(), 0, entry->config.lpDisplayName);
HeapFree(GetProcessHeap(), 0, entry->description);
HeapFree(GetProcessHeap(), 0, entry->dependOnServices);
HeapFree(GetProcessHeap(), 0, entry->dependOnGroups);
CloseHandle(entry->control_mutex);
CloseHandle(entry->control_pipe);
CloseHandle(entry->status_changed_event);
HeapFree(GetProcessHeap(), 0, entry);
}
static DWORD load_service_config(HKEY hKey, struct service_entry *entry)
{
DWORD err;
WCHAR *wptr;
if ((err = load_reg_string(hKey, SZ_IMAGE_PATH, TRUE, &entry->config.lpBinaryPathName)) != 0)
return err;
if ((err = load_reg_string(hKey, SZ_GROUP, 0, &entry->config.lpLoadOrderGroup)) != 0)
return err;
if ((err = load_reg_string(hKey, SZ_OBJECT_NAME, TRUE, &entry->config.lpServiceStartName)) != 0)
return err;
if ((err = load_reg_string(hKey, SZ_DISPLAY_NAME, 0, &entry->config.lpDisplayName)) != 0)
return err;
if ((err = load_reg_string(hKey, SZ_DESCRIPTION, 0, &entry->description)) != 0)
return err;
if ((err = load_reg_multisz(hKey, SZ_DEPEND_ON_SERVICE, &entry->dependOnServices)) != 0)
return err;
if ((err = load_reg_multisz(hKey, SZ_DEPEND_ON_GROUP, &entry->dependOnGroups)) != 0)
return err;
if ((err = load_reg_dword(hKey, SZ_TYPE, &entry->config.dwServiceType)) != 0)
return err;
if ((err = load_reg_dword(hKey, SZ_START, &entry->config.dwStartType)) != 0)
return err;
if ((err = load_reg_dword(hKey, SZ_ERROR, &entry->config.dwErrorControl)) != 0)
return err;
if ((err = load_reg_dword(hKey, SZ_TAG, &entry->config.dwTagId)) != 0)
return err;
WINE_TRACE("Image path = %s\n", wine_dbgstr_w(entry->config.lpBinaryPathName) );
WINE_TRACE("Group = %s\n", wine_dbgstr_w(entry->config.lpLoadOrderGroup) );
WINE_TRACE("Service account name = %s\n", wine_dbgstr_w(entry->config.lpServiceStartName) );
WINE_TRACE("Display name = %s\n", wine_dbgstr_w(entry->config.lpDisplayName) );
WINE_TRACE("Service dependancies : %s\n", entry->dependOnServices[0] ? "" : "(none)");
for (wptr = entry->dependOnServices; *wptr; wptr += strlenW(wptr) + 1)
WINE_TRACE(" * %s\n", wine_dbgstr_w(wptr));
WINE_TRACE("Group dependancies : %s\n", entry->dependOnGroups[0] ? "" : "(none)");
for (wptr = entry->dependOnGroups; *wptr; wptr += strlenW(wptr) + 1)
WINE_TRACE(" * %s\n", wine_dbgstr_w(wptr));
return ERROR_SUCCESS;
}
static DWORD reg_set_string_value(HKEY hKey, LPCWSTR value_name, LPCWSTR string)
{
if (!string)
{
DWORD err;
err = RegDeleteValueW(hKey, value_name);
if (err != ERROR_FILE_NOT_FOUND)
return err;
return ERROR_SUCCESS;
}
return RegSetValueExW(hKey, value_name, 0, REG_SZ, (LPBYTE)string, sizeof(WCHAR)*(strlenW(string) + 1));
}
DWORD save_service_config(struct service_entry *entry)
{
DWORD err;
HKEY hKey = NULL;
err = RegCreateKeyW(entry->db->root_key, entry->name, &hKey);
if (err != ERROR_SUCCESS)
goto cleanup;
if ((err = reg_set_string_value(hKey, SZ_DISPLAY_NAME, entry->config.lpDisplayName)) != 0)
goto cleanup;
if ((err = reg_set_string_value(hKey, SZ_IMAGE_PATH, entry->config.lpBinaryPathName)) != 0)
goto cleanup;
if ((err = reg_set_string_value(hKey, SZ_GROUP, entry->config.lpLoadOrderGroup)) != 0)
goto cleanup;
if ((err = reg_set_string_value(hKey, SZ_OBJECT_NAME, entry->config.lpServiceStartName)) != 0)
goto cleanup;
if ((err = reg_set_string_value(hKey, SZ_DESCRIPTION, entry->description)) != 0)
goto cleanup;
if ((err = RegSetValueExW(hKey, SZ_START, 0, REG_DWORD, (LPBYTE)&entry->config.dwStartType, sizeof(DWORD))) != 0)
goto cleanup;
if ((err = RegSetValueExW(hKey, SZ_ERROR, 0, REG_DWORD, (LPBYTE)&entry->config.dwErrorControl, sizeof(DWORD))) != 0)
goto cleanup;
if ((err = RegSetValueExW(hKey, SZ_TYPE, 0, REG_DWORD, (LPBYTE)&entry->config.dwServiceType, sizeof(DWORD))) != 0)
goto cleanup;
if (entry->config.dwTagId)
err = RegSetValueExW(hKey, SZ_TAG, 0, REG_DWORD, (LPBYTE)&entry->config.dwTagId, sizeof(DWORD));
else
err = RegDeleteValueW(hKey, SZ_TAG);
if (err != 0 && err != ERROR_FILE_NOT_FOUND)
goto cleanup;
err = ERROR_SUCCESS;
cleanup:
RegCloseKey(hKey);
return err;
}
DWORD scmdatabase_add_service(struct scmdatabase *db, struct service_entry *service)
{
int err;
service->db = db;
if ((err = save_service_config(service)) != ERROR_SUCCESS)
{
WINE_ERR("Couldn't store service configuration: error %u\n", err);
return ERROR_GEN_FAILURE;
}
list_add_tail(&db->services, &service->entry);
return ERROR_SUCCESS;
}
DWORD scmdatabase_remove_service(struct scmdatabase *db, struct service_entry *service)
{
int err;
err = RegDeleteTreeW(db->root_key, service->name);
if (err != 0)
return err;
list_remove(&service->entry);
service->entry.next = service->entry.prev = NULL;
return ERROR_SUCCESS;
}
BOOL validate_service_name(LPCWSTR name)
{
return (name && name[0] && !strchrW(name, '/') && !strchrW(name, '\\'));
}
BOOL validate_service_config(struct service_entry *entry)
{
if (entry->config.dwServiceType & SERVICE_WIN32 && (entry->config.lpBinaryPathName == NULL || !entry->config.lpBinaryPathName[0]))
{
WINE_ERR("Service %s is Win32 but have no image path set\n", wine_dbgstr_w(entry->name));
return FALSE;
}
switch (entry->config.dwServiceType)
{
case SERVICE_KERNEL_DRIVER:
case SERVICE_FILE_SYSTEM_DRIVER:
case SERVICE_WIN32_OWN_PROCESS:
case SERVICE_WIN32_SHARE_PROCESS:
/* No problem */
break;
case SERVICE_WIN32_OWN_PROCESS | SERVICE_INTERACTIVE_PROCESS:
case SERVICE_WIN32_SHARE_PROCESS | SERVICE_INTERACTIVE_PROCESS:
/* These can be only run as LocalSystem */
if (entry->config.lpServiceStartName && strcmpiW(entry->config.lpServiceStartName, SZ_LOCAL_SYSTEM) != 0)
{
WINE_ERR("Service %s is interactive but has a start name\n", wine_dbgstr_w(entry->name));
return FALSE;
}
break;
default:
WINE_ERR("Service %s have unknown service type\n", wine_dbgstr_w(entry->name));
return FALSE;
}
/* StartType can only be a single value (if several values are mixed the result is probably not what was intended) */
if (entry->config.dwStartType > SERVICE_DISABLED)
{
WINE_ERR("Service %s have unknown start type\n", wine_dbgstr_w(entry->name));
return FALSE;
}
/* SERVICE_BOOT_START and SERVICE_SYSTEM_START or only allowed for driver services */
if (((entry->config.dwStartType == SERVICE_BOOT_START) || (entry->config.dwStartType == SERVICE_SYSTEM_START)) &&
((entry->config.dwServiceType & SERVICE_WIN32_OWN_PROCESS) || (entry->config.dwServiceType & SERVICE_WIN32_SHARE_PROCESS)))
{
WINE_ERR("Service %s - SERVICE_BOOT_START and SERVICE_SYSTEM_START are only allowed for driver services\n", wine_dbgstr_w(entry->name));
return FALSE;
}
if (entry->config.lpServiceStartName == NULL)
entry->config.lpServiceStartName = strdupW(SZ_LOCAL_SYSTEM);
return TRUE;
}
struct service_entry *scmdatabase_find_service(struct scmdatabase *db, LPCWSTR name)
{
struct service_entry *service;
LIST_FOR_EACH_ENTRY(service, &db->services, struct service_entry, entry)
{
if (strcmpiW(name, service->name) == 0)
return service;
}
return NULL;
}
struct service_entry *scmdatabase_find_service_by_displayname(struct scmdatabase *db, LPCWSTR name)
{
struct service_entry *service;
LIST_FOR_EACH_ENTRY(service, &db->services, struct service_entry, entry)
{
if (strcmpiW(name, service->config.lpDisplayName) == 0)
return service;
}
return NULL;
}
void release_service(struct service_entry *service)
{
if (InterlockedDecrement(&service->ref_count) == 0 && is_marked_for_delete(service))
free_service_entry(service);
}
static DWORD scmdatabase_create(struct scmdatabase **db)
{
DWORD err;
*db = HeapAlloc(GetProcessHeap(), 0, sizeof(**db));
if (!*db)
return ERROR_NOT_ENOUGH_SERVER_MEMORY;
(*db)->service_start_lock = FALSE;
list_init(&(*db)->services);
InitializeCriticalSection(&(*db)->cs);
err = RegCreateKeyExW(HKEY_LOCAL_MACHINE, SZ_SERVICES_KEY, 0, NULL,
REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL,
&(*db)->root_key, NULL);
if (err != ERROR_SUCCESS)
HeapFree(GetProcessHeap(), 0, *db);
return err;
}
static void scmdatabase_destroy(struct scmdatabase *db)
{
RegCloseKey(db->root_key);
DeleteCriticalSection(&db->cs);
HeapFree(GetProcessHeap(), 0, db);
}
static DWORD scmdatabase_load_services(struct scmdatabase *db)
{
DWORD err;
int i;
for (i = 0; TRUE; i++)
{
WCHAR szName[MAX_SERVICE_NAME];
struct service_entry *entry;
HKEY hServiceKey;
err = RegEnumKeyW(db->root_key, i, szName, MAX_SERVICE_NAME);
if (err == ERROR_NO_MORE_ITEMS)
break;
if (err != 0)
{
WINE_ERR("Error %d reading key %d name - skipping\n", err, i);
continue;
}
err = service_create(szName, &entry);
if (err != ERROR_SUCCESS)
break;
WINE_TRACE("Loading service %s\n", wine_dbgstr_w(szName));
err = RegOpenKeyExW(db->root_key, szName, 0, KEY_READ | KEY_WRITE, &hServiceKey);
if (err == ERROR_SUCCESS)
{
err = load_service_config(hServiceKey, entry);
RegCloseKey(hServiceKey);
}
if (err != ERROR_SUCCESS)
{
WINE_ERR("Error %d reading registry key for service %s - skipping\n", err, wine_dbgstr_w(szName));
free_service_entry(entry);
continue;
}
if (entry->config.dwServiceType == 0)
{
/* Maybe an application only wrote some configuration in the service key. Continue silently */
WINE_TRACE("Even the service type not set for service %s - skipping\n", wine_dbgstr_w(szName));
free_service_entry(entry);
continue;
}
if (!validate_service_config(entry))
{
WINE_ERR("Invalid configuration of service %s - skipping\n", wine_dbgstr_w(szName));
free_service_entry(entry);
continue;
}
entry->status.dwServiceType = entry->config.dwServiceType;
entry->status.dwCurrentState = SERVICE_STOPPED;
entry->status.dwWin32ExitCode = ERROR_SERVICE_NEVER_STARTED;
entry->db = db;
/* all other fields are zero */
list_add_tail(&db->services, &entry->entry);
}
return ERROR_SUCCESS;
}
DWORD scmdatabase_lock_startup(struct scmdatabase *db)
{
if (InterlockedCompareExchange(&db->service_start_lock, TRUE, FALSE))
return ERROR_SERVICE_DATABASE_LOCKED;
return ERROR_SUCCESS;
}
void scmdatabase_unlock_startup(struct scmdatabase *db)
{
InterlockedCompareExchange(&db->service_start_lock, FALSE, TRUE);
}
void scmdatabase_lock_shared(struct scmdatabase *db)
{
EnterCriticalSection(&db->cs);
}
void scmdatabase_lock_exclusive(struct scmdatabase *db)
{
EnterCriticalSection(&db->cs);
}
void scmdatabase_unlock(struct scmdatabase *db)
{
LeaveCriticalSection(&db->cs);
}
void service_lock_shared(struct service_entry *service)
{
EnterCriticalSection(&service->db->cs);
}
void service_lock_exclusive(struct service_entry *service)
{
EnterCriticalSection(&service->db->cs);
}
void service_unlock(struct service_entry *service)
{
LeaveCriticalSection(&service->db->cs);
}
int main(int argc, char *argv[])
{
static const WCHAR svcctl_started_event[] = SVCCTL_STARTED_EVENT;
DWORD err;
g_hStartedEvent = CreateEventW(NULL, TRUE, FALSE, svcctl_started_event);
err = scmdatabase_create(&active_database);
if (err != ERROR_SUCCESS)
return err;
if ((err = scmdatabase_load_services(active_database)) != ERROR_SUCCESS)
return err;
err = RPC_MainLoop();
scmdatabase_destroy(active_database);
return err;
}
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