wtsapi.c

 
#include <winpr/config.h>
 
#include <winpr/crt.h>
#include <winpr/ini.h>
#include <winpr/path.h>
#include <winpr/synch.h>
#include <winpr/library.h>
#include <winpr/environment.h>
 
#include <winpr/wtsapi.h>
 
#ifdef _WIN32
#include "wtsapi_win32.h"
#endif
 
#include "../log.h"
#define TAG WINPR_TAG("wtsapi")
 
static HMODULE g_WtsApiModule = NULL;
 
static const WtsApiFunctionTable* g_WtsApi = NULL;
 
#if defined(_WIN32)
static HMODULE g_WtsApi32Module = NULL;
static WtsApiFunctionTable WtsApi32_WtsApiFunctionTable = { 0 };
 
#ifdef __MINGW32__
#define WTSAPI32_LOAD_PROC(NAME, TYPE) \
  WtsApi32_WtsApiFunctionTable.p##NAME = GetProcAddressAs(g_WtsApi32Module, "WTS" #NAME, TYPE);
#else
#define WTSAPI32_LOAD_PROC(NAME, TYPE) \
  WtsApi32_WtsApiFunctionTable.p##NAME = GetProcAddressAs(g_WtsApi32Module, "WTS" #NAME, ##TYPE);
#endif
 
static BOOL WtsApi32_InitializeWtsApi(void)
{
  g_WtsApi32Module = LoadLibraryA("wtsapi32.dll");
 
  if (!g_WtsApi32Module)
    return FALSE;
 
  WTSAPI32_LOAD_PROC(StopRemoteControlSession, WTS_STOP_REMOTE_CONTROL_SESSION_FN);
  WTSAPI32_LOAD_PROC(StartRemoteControlSessionW, WTS_START_REMOTE_CONTROL_SESSION_FN_W);
  WTSAPI32_LOAD_PROC(StartRemoteControlSessionA, WTS_START_REMOTE_CONTROL_SESSION_FN_A);
  WTSAPI32_LOAD_PROC(ConnectSessionW, WTS_CONNECT_SESSION_FN_W);
  WTSAPI32_LOAD_PROC(ConnectSessionA, WTS_CONNECT_SESSION_FN_A);
  WTSAPI32_LOAD_PROC(EnumerateServersW, WTS_ENUMERATE_SERVERS_FN_W);
  WTSAPI32_LOAD_PROC(EnumerateServersA, WTS_ENUMERATE_SERVERS_FN_A);
  WTSAPI32_LOAD_PROC(OpenServerW, WTS_OPEN_SERVER_FN_W);
  WTSAPI32_LOAD_PROC(OpenServerA, WTS_OPEN_SERVER_FN_A);
  WTSAPI32_LOAD_PROC(OpenServerExW, WTS_OPEN_SERVER_EX_FN_W);
  WTSAPI32_LOAD_PROC(OpenServerExA, WTS_OPEN_SERVER_EX_FN_A);
  WTSAPI32_LOAD_PROC(CloseServer, WTS_CLOSE_SERVER_FN);
  WTSAPI32_LOAD_PROC(EnumerateSessionsW, WTS_ENUMERATE_SESSIONS_FN_W);
  WTSAPI32_LOAD_PROC(EnumerateSessionsA, WTS_ENUMERATE_SESSIONS_FN_A);
  WTSAPI32_LOAD_PROC(EnumerateSessionsExW, WTS_ENUMERATE_SESSIONS_EX_FN_W);
  WTSAPI32_LOAD_PROC(EnumerateSessionsExA, WTS_ENUMERATE_SESSIONS_EX_FN_A);
  WTSAPI32_LOAD_PROC(EnumerateProcessesW, WTS_ENUMERATE_PROCESSES_FN_W);
  WTSAPI32_LOAD_PROC(EnumerateProcessesA, WTS_ENUMERATE_PROCESSES_FN_A);
  WTSAPI32_LOAD_PROC(TerminateProcess, WTS_TERMINATE_PROCESS_FN);
  WTSAPI32_LOAD_PROC(QuerySessionInformationW, WTS_QUERY_SESSION_INFORMATION_FN_W);
  WTSAPI32_LOAD_PROC(QuerySessionInformationA, WTS_QUERY_SESSION_INFORMATION_FN_A);
  WTSAPI32_LOAD_PROC(QueryUserConfigW, WTS_QUERY_USER_CONFIG_FN_W);
  WTSAPI32_LOAD_PROC(QueryUserConfigA, WTS_QUERY_USER_CONFIG_FN_A);
  WTSAPI32_LOAD_PROC(SetUserConfigW, WTS_SET_USER_CONFIG_FN_W);
  WTSAPI32_LOAD_PROC(SetUserConfigA, WTS_SET_USER_CONFIG_FN_A);
  WTSAPI32_LOAD_PROC(SendMessageW, WTS_SEND_MESSAGE_FN_W);
  WTSAPI32_LOAD_PROC(SendMessageA, WTS_SEND_MESSAGE_FN_A);
  WTSAPI32_LOAD_PROC(DisconnectSession, WTS_DISCONNECT_SESSION_FN);
  WTSAPI32_LOAD_PROC(LogoffSession, WTS_LOGOFF_SESSION_FN);
  WTSAPI32_LOAD_PROC(ShutdownSystem, WTS_SHUTDOWN_SYSTEM_FN);
  WTSAPI32_LOAD_PROC(WaitSystemEvent, WTS_WAIT_SYSTEM_EVENT_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelOpen, WTS_VIRTUAL_CHANNEL_OPEN_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelOpenEx, WTS_VIRTUAL_CHANNEL_OPEN_EX_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelClose, WTS_VIRTUAL_CHANNEL_CLOSE_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelRead, WTS_VIRTUAL_CHANNEL_READ_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelWrite, WTS_VIRTUAL_CHANNEL_WRITE_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelPurgeInput, WTS_VIRTUAL_CHANNEL_PURGE_INPUT_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelPurgeOutput, WTS_VIRTUAL_CHANNEL_PURGE_OUTPUT_FN);
  WTSAPI32_LOAD_PROC(VirtualChannelQuery, WTS_VIRTUAL_CHANNEL_QUERY_FN);
  WTSAPI32_LOAD_PROC(FreeMemory, WTS_FREE_MEMORY_FN);
  WTSAPI32_LOAD_PROC(RegisterSessionNotification, WTS_REGISTER_SESSION_NOTIFICATION_FN);
  WTSAPI32_LOAD_PROC(UnRegisterSessionNotification, WTS_UNREGISTER_SESSION_NOTIFICATION_FN);
  WTSAPI32_LOAD_PROC(RegisterSessionNotificationEx, WTS_REGISTER_SESSION_NOTIFICATION_EX_FN);
  WTSAPI32_LOAD_PROC(UnRegisterSessionNotificationEx, WTS_UNREGISTER_SESSION_NOTIFICATION_EX_FN);
  WTSAPI32_LOAD_PROC(QueryUserToken, WTS_QUERY_USER_TOKEN_FN);
  WTSAPI32_LOAD_PROC(FreeMemoryExW, WTS_FREE_MEMORY_EX_FN_W);
  WTSAPI32_LOAD_PROC(FreeMemoryExA, WTS_FREE_MEMORY_EX_FN_A);
  WTSAPI32_LOAD_PROC(EnumerateProcessesExW, WTS_ENUMERATE_PROCESSES_EX_FN_W);
  WTSAPI32_LOAD_PROC(EnumerateProcessesExA, WTS_ENUMERATE_PROCESSES_EX_FN_A);
  WTSAPI32_LOAD_PROC(EnumerateListenersW, WTS_ENUMERATE_LISTENERS_FN_W);
  WTSAPI32_LOAD_PROC(EnumerateListenersA, WTS_ENUMERATE_LISTENERS_FN_A);
  WTSAPI32_LOAD_PROC(QueryListenerConfigW, WTS_QUERY_LISTENER_CONFIG_FN_W);
  WTSAPI32_LOAD_PROC(QueryListenerConfigA, WTS_QUERY_LISTENER_CONFIG_FN_A);
  WTSAPI32_LOAD_PROC(CreateListenerW, WTS_CREATE_LISTENER_FN_W);
  WTSAPI32_LOAD_PROC(CreateListenerA, WTS_CREATE_LISTENER_FN_A);
  WTSAPI32_LOAD_PROC(SetListenerSecurityW, WTS_SET_LISTENER_SECURITY_FN_W);
  WTSAPI32_LOAD_PROC(SetListenerSecurityA, WTS_SET_LISTENER_SECURITY_FN_A);
  WTSAPI32_LOAD_PROC(GetListenerSecurityW, WTS_GET_LISTENER_SECURITY_FN_W);
  WTSAPI32_LOAD_PROC(GetListenerSecurityA, WTS_GET_LISTENER_SECURITY_FN_A);
  WTSAPI32_LOAD_PROC(EnableChildSessions, WTS_ENABLE_CHILD_SESSIONS_FN);
  WTSAPI32_LOAD_PROC(IsChildSessionsEnabled, WTS_IS_CHILD_SESSIONS_ENABLED_FN);
  WTSAPI32_LOAD_PROC(GetChildSessionId, WTS_GET_CHILD_SESSION_ID_FN);
  WTSAPI32_LOAD_PROC(GetActiveConsoleSessionId, WTS_GET_ACTIVE_CONSOLE_SESSION_ID_FN);
 
  Win32_InitializeWinSta(&WtsApi32_WtsApiFunctionTable);
 
  g_WtsApi = &WtsApi32_WtsApiFunctionTable;
 
  return TRUE;
}
#endif
 
/* WtsApi Functions */
 
static BOOL CALLBACK InitializeWtsApiStubs(PINIT_ONCE once, PVOID param, PVOID* context);
static INIT_ONCE wtsapiInitOnce = INIT_ONCE_STATIC_INIT;
 
#define WTSAPI_STUB_CALL_VOID(_name, ...)                                    \
  InitOnceExecuteOnce(&wtsapiInitOnce, InitializeWtsApiStubs, NULL, NULL); \
  if (!g_WtsApi || !g_WtsApi->p##_name)                                    \
    return;                                                              \
  g_WtsApi->p##_name(__VA_ARGS__)
 
#define WTSAPI_STUB_CALL_BOOL(_name, ...)                                    \
  InitOnceExecuteOnce(&wtsapiInitOnce, InitializeWtsApiStubs, NULL, NULL); \
  if (!g_WtsApi || !g_WtsApi->p##_name)                                    \
    return FALSE;                                                        \
  return g_WtsApi->p##_name(__VA_ARGS__)
 
#define WTSAPI_STUB_CALL_HANDLE(_name, ...)                                  \
  InitOnceExecuteOnce(&wtsapiInitOnce, InitializeWtsApiStubs, NULL, NULL); \
  if (!g_WtsApi || !g_WtsApi->p##_name)                                    \
    return NULL;                                                         \
  return g_WtsApi->p##_name(__VA_ARGS__)
 
BOOL WINAPI WTSStartRemoteControlSessionW(LPWSTR pTargetServerName, ULONG TargetLogonId,
                                          BYTE HotkeyVk, USHORT HotkeyModifiers)
{
  WTSAPI_STUB_CALL_BOOL(StartRemoteControlSessionW, pTargetServerName, TargetLogonId, HotkeyVk,
                        HotkeyModifiers);
}
 
BOOL WINAPI WTSStartRemoteControlSessionA(LPSTR pTargetServerName, ULONG TargetLogonId,
                                          BYTE HotkeyVk, USHORT HotkeyModifiers)
{
  WTSAPI_STUB_CALL_BOOL(StartRemoteControlSessionA, pTargetServerName, TargetLogonId, HotkeyVk,
                        HotkeyModifiers);
}
 
BOOL WINAPI WTSStartRemoteControlSessionExW(LPWSTR pTargetServerName, ULONG TargetLogonId,
                                            BYTE HotkeyVk, USHORT HotkeyModifiers, DWORD flags)
{
  WTSAPI_STUB_CALL_BOOL(StartRemoteControlSessionExW, pTargetServerName, TargetLogonId, HotkeyVk,
                        HotkeyModifiers, flags);
}
 
BOOL WINAPI WTSStartRemoteControlSessionExA(LPSTR pTargetServerName, ULONG TargetLogonId,
                                            BYTE HotkeyVk, USHORT HotkeyModifiers, DWORD flags)
{
  WTSAPI_STUB_CALL_BOOL(StartRemoteControlSessionExA, pTargetServerName, TargetLogonId, HotkeyVk,
                        HotkeyModifiers, flags);
}
 
BOOL WINAPI WTSStopRemoteControlSession(ULONG LogonId)
{
  WTSAPI_STUB_CALL_BOOL(StopRemoteControlSession, LogonId);
}
 
BOOL WINAPI WTSConnectSessionW(ULONG LogonId, ULONG TargetLogonId, PWSTR pPassword, BOOL bWait)
{
  WTSAPI_STUB_CALL_BOOL(ConnectSessionW, LogonId, TargetLogonId, pPassword, bWait);
}
 
BOOL WINAPI WTSConnectSessionA(ULONG LogonId, ULONG TargetLogonId, PSTR pPassword, BOOL bWait)
{
  WTSAPI_STUB_CALL_BOOL(ConnectSessionA, LogonId, TargetLogonId, pPassword, bWait);
}
 
BOOL WINAPI WTSEnumerateServersW(LPWSTR pDomainName, DWORD Reserved, DWORD Version,
                                 PWTS_SERVER_INFOW* ppServerInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateServersW, pDomainName, Reserved, Version, ppServerInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateServersA(LPSTR pDomainName, DWORD Reserved, DWORD Version,
                                 PWTS_SERVER_INFOA* ppServerInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateServersA, pDomainName, Reserved, Version, ppServerInfo, pCount);
}
 
HANDLE WINAPI WTSOpenServerW(LPWSTR pServerName)
{
  WTSAPI_STUB_CALL_HANDLE(OpenServerW, pServerName);
}
 
HANDLE WINAPI WTSOpenServerA(LPSTR pServerName)
{
  WTSAPI_STUB_CALL_HANDLE(OpenServerA, pServerName);
}
 
HANDLE WINAPI WTSOpenServerExW(LPWSTR pServerName)
{
  WTSAPI_STUB_CALL_HANDLE(OpenServerExW, pServerName);
}
 
HANDLE WINAPI WTSOpenServerExA(LPSTR pServerName)
{
  WTSAPI_STUB_CALL_HANDLE(OpenServerExA, pServerName);
}
 
VOID WINAPI WTSCloseServer(HANDLE hServer)
{
  WTSAPI_STUB_CALL_VOID(CloseServer, hServer);
}
 
BOOL WINAPI WTSEnumerateSessionsW(HANDLE hServer, DWORD Reserved, DWORD Version,
                                  PWTS_SESSION_INFOW* ppSessionInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateSessionsW, hServer, Reserved, Version, ppSessionInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateSessionsA(HANDLE hServer, DWORD Reserved, DWORD Version,
                                  PWTS_SESSION_INFOA* ppSessionInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateSessionsA, hServer, Reserved, Version, ppSessionInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateSessionsExW(HANDLE hServer, DWORD* pLevel, DWORD Filter,
                                    PWTS_SESSION_INFO_1W* ppSessionInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateSessionsExW, hServer, pLevel, Filter, ppSessionInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateSessionsExA(HANDLE hServer, DWORD* pLevel, DWORD Filter,
                                    PWTS_SESSION_INFO_1A* ppSessionInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateSessionsExA, hServer, pLevel, Filter, ppSessionInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateProcessesW(HANDLE hServer, DWORD Reserved, DWORD Version,
                                   PWTS_PROCESS_INFOW* ppProcessInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateProcessesW, hServer, Reserved, Version, ppProcessInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateProcessesA(HANDLE hServer, DWORD Reserved, DWORD Version,
                                   PWTS_PROCESS_INFOA* ppProcessInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateProcessesA, hServer, Reserved, Version, ppProcessInfo, pCount);
}
 
BOOL WINAPI WTSTerminateProcess(HANDLE hServer, DWORD ProcessId, DWORD ExitCode)
{
  WTSAPI_STUB_CALL_BOOL(TerminateProcess, hServer, ProcessId, ExitCode);
}
 
BOOL WINAPI WTSQuerySessionInformationW(HANDLE hServer, DWORD SessionId,
                                        WTS_INFO_CLASS WTSInfoClass, LPWSTR* ppBuffer,
                                        DWORD* pBytesReturned)
{
  WTSAPI_STUB_CALL_BOOL(QuerySessionInformationW, hServer, SessionId, WTSInfoClass, ppBuffer,
                        pBytesReturned);
}
 
BOOL WINAPI WTSQuerySessionInformationA(HANDLE hServer, DWORD SessionId,
                                        WTS_INFO_CLASS WTSInfoClass, LPSTR* ppBuffer,
                                        DWORD* pBytesReturned)
{
  WTSAPI_STUB_CALL_BOOL(QuerySessionInformationA, hServer, SessionId, WTSInfoClass, ppBuffer,
                        pBytesReturned);
}
 
BOOL WINAPI WTSQueryUserConfigW(LPWSTR pServerName, LPWSTR pUserName,
                                WTS_CONFIG_CLASS WTSConfigClass, LPWSTR* ppBuffer,
                                DWORD* pBytesReturned)
{
  WTSAPI_STUB_CALL_BOOL(QueryUserConfigW, pServerName, pUserName, WTSConfigClass, ppBuffer,
                        pBytesReturned);
}
 
BOOL WINAPI WTSQueryUserConfigA(LPSTR pServerName, LPSTR pUserName, WTS_CONFIG_CLASS WTSConfigClass,
                                LPSTR* ppBuffer, DWORD* pBytesReturned)
{
  WTSAPI_STUB_CALL_BOOL(QueryUserConfigA, pServerName, pUserName, WTSConfigClass, ppBuffer,
                        pBytesReturned);
}
 
BOOL WINAPI WTSSetUserConfigW(LPWSTR pServerName, LPWSTR pUserName, WTS_CONFIG_CLASS WTSConfigClass,
                              LPWSTR pBuffer, DWORD DataLength)
{
  WTSAPI_STUB_CALL_BOOL(SetUserConfigW, pServerName, pUserName, WTSConfigClass, pBuffer,
                        DataLength);
}
 
BOOL WINAPI WTSSetUserConfigA(LPSTR pServerName, LPSTR pUserName, WTS_CONFIG_CLASS WTSConfigClass,
                              LPSTR pBuffer, DWORD DataLength)
{
  WTSAPI_STUB_CALL_BOOL(SetUserConfigA, pServerName, pUserName, WTSConfigClass, pBuffer,
                        DataLength);
}
 
BOOL WINAPI WTSSendMessageW(HANDLE hServer, DWORD SessionId, LPWSTR pTitle, DWORD TitleLength,
                            LPWSTR pMessage, DWORD MessageLength, DWORD Style, DWORD Timeout,
                            DWORD* pResponse, BOOL bWait)
{
  WTSAPI_STUB_CALL_BOOL(SendMessageW, hServer, SessionId, pTitle, TitleLength, pMessage,
                        MessageLength, Style, Timeout, pResponse, bWait);
}
 
BOOL WINAPI WTSSendMessageA(HANDLE hServer, DWORD SessionId, LPSTR pTitle, DWORD TitleLength,
                            LPSTR pMessage, DWORD MessageLength, DWORD Style, DWORD Timeout,
                            DWORD* pResponse, BOOL bWait)
{
  WTSAPI_STUB_CALL_BOOL(SendMessageA, hServer, SessionId, pTitle, TitleLength, pMessage,
                        MessageLength, Style, Timeout, pResponse, bWait);
}
 
BOOL WINAPI WTSDisconnectSession(HANDLE hServer, DWORD SessionId, BOOL bWait)
{
  WTSAPI_STUB_CALL_BOOL(DisconnectSession, hServer, SessionId, bWait);
}
 
BOOL WINAPI WTSLogoffSession(HANDLE hServer, DWORD SessionId, BOOL bWait)
{
  WTSAPI_STUB_CALL_BOOL(LogoffSession, hServer, SessionId, bWait);
}
 
BOOL WINAPI WTSShutdownSystem(HANDLE hServer, DWORD ShutdownFlag)
{
  WTSAPI_STUB_CALL_BOOL(ShutdownSystem, hServer, ShutdownFlag);
}
 
BOOL WINAPI WTSWaitSystemEvent(HANDLE hServer, DWORD EventMask, DWORD* pEventFlags)
{
  WTSAPI_STUB_CALL_BOOL(WaitSystemEvent, hServer, EventMask, pEventFlags);
}
 
HANDLE WINAPI WTSVirtualChannelOpen(HANDLE hServer, DWORD SessionId, LPSTR pVirtualName)
{
  WTSAPI_STUB_CALL_HANDLE(VirtualChannelOpen, hServer, SessionId, pVirtualName);
}
 
HANDLE WINAPI WTSVirtualChannelOpenEx(DWORD SessionId, LPSTR pVirtualName, DWORD flags)
{
  WTSAPI_STUB_CALL_HANDLE(VirtualChannelOpenEx, SessionId, pVirtualName, flags);
}
 
BOOL WINAPI WTSVirtualChannelClose(HANDLE hChannelHandle)
{
  WTSAPI_STUB_CALL_BOOL(VirtualChannelClose, hChannelHandle);
}
 
BOOL WINAPI WTSVirtualChannelRead(HANDLE hChannelHandle, ULONG TimeOut, PCHAR Buffer,
                                  ULONG BufferSize, PULONG pBytesRead)
{
  WTSAPI_STUB_CALL_BOOL(VirtualChannelRead, hChannelHandle, TimeOut, Buffer, BufferSize,
                        pBytesRead);
}
 
BOOL WINAPI WTSVirtualChannelWrite(HANDLE hChannelHandle, PCHAR Buffer, ULONG Length,
                                   PULONG pBytesWritten)
{
  WTSAPI_STUB_CALL_BOOL(VirtualChannelWrite, hChannelHandle, Buffer, Length, pBytesWritten);
}
 
BOOL WINAPI WTSVirtualChannelPurgeInput(HANDLE hChannelHandle)
{
  WTSAPI_STUB_CALL_BOOL(VirtualChannelPurgeInput, hChannelHandle);
}
 
BOOL WINAPI WTSVirtualChannelPurgeOutput(HANDLE hChannelHandle)
{
  WTSAPI_STUB_CALL_BOOL(VirtualChannelPurgeOutput, hChannelHandle);
}
 
BOOL WINAPI WTSVirtualChannelQuery(HANDLE hChannelHandle, WTS_VIRTUAL_CLASS WtsVirtualClass,
                                   PVOID* ppBuffer, DWORD* pBytesReturned)
{
  WTSAPI_STUB_CALL_BOOL(VirtualChannelQuery, hChannelHandle, WtsVirtualClass, ppBuffer,
                        pBytesReturned);
}
 
VOID WINAPI WTSFreeMemory(PVOID pMemory)
{
  WTSAPI_STUB_CALL_VOID(FreeMemory, pMemory);
}
 
BOOL WINAPI WTSFreeMemoryExW(WTS_TYPE_CLASS WTSTypeClass, PVOID pMemory, ULONG NumberOfEntries)
{
  WTSAPI_STUB_CALL_BOOL(FreeMemoryExW, WTSTypeClass, pMemory, NumberOfEntries);
}
 
BOOL WINAPI WTSFreeMemoryExA(WTS_TYPE_CLASS WTSTypeClass, PVOID pMemory, ULONG NumberOfEntries)
{
  WTSAPI_STUB_CALL_BOOL(FreeMemoryExA, WTSTypeClass, pMemory, NumberOfEntries);
}
 
BOOL WINAPI WTSRegisterSessionNotification(HWND hWnd, DWORD dwFlags)
{
  WTSAPI_STUB_CALL_BOOL(RegisterSessionNotification, hWnd, dwFlags);
}
 
BOOL WINAPI WTSUnRegisterSessionNotification(HWND hWnd)
{
  WTSAPI_STUB_CALL_BOOL(UnRegisterSessionNotification, hWnd);
}
 
BOOL WINAPI WTSRegisterSessionNotificationEx(HANDLE hServer, HWND hWnd, DWORD dwFlags)
{
  WTSAPI_STUB_CALL_BOOL(RegisterSessionNotificationEx, hServer, hWnd, dwFlags);
}
 
BOOL WINAPI WTSUnRegisterSessionNotificationEx(HANDLE hServer, HWND hWnd)
{
  WTSAPI_STUB_CALL_BOOL(UnRegisterSessionNotificationEx, hServer, hWnd);
}
 
BOOL WINAPI WTSQueryUserToken(ULONG SessionId, PHANDLE phToken)
{
  WTSAPI_STUB_CALL_BOOL(QueryUserToken, SessionId, phToken);
}
 
BOOL WINAPI WTSEnumerateProcessesExW(HANDLE hServer, DWORD* pLevel, DWORD SessionId,
                                     LPWSTR* ppProcessInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateProcessesExW, hServer, pLevel, SessionId, ppProcessInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateProcessesExA(HANDLE hServer, DWORD* pLevel, DWORD SessionId,
                                     LPSTR* ppProcessInfo, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateProcessesExA, hServer, pLevel, SessionId, ppProcessInfo, pCount);
}
 
BOOL WINAPI WTSEnumerateListenersW(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                   PWTSLISTENERNAMEW pListeners, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateListenersW, hServer, pReserved, Reserved, pListeners, pCount);
}
 
BOOL WINAPI WTSEnumerateListenersA(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                   PWTSLISTENERNAMEA pListeners, DWORD* pCount)
{
  WTSAPI_STUB_CALL_BOOL(EnumerateListenersA, hServer, pReserved, Reserved, pListeners, pCount);
}
 
BOOL WINAPI WTSQueryListenerConfigW(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                    LPWSTR pListenerName, PWTSLISTENERCONFIGW pBuffer)
{
  WTSAPI_STUB_CALL_BOOL(QueryListenerConfigW, hServer, pReserved, Reserved, pListenerName,
                        pBuffer);
}
 
BOOL WINAPI WTSQueryListenerConfigA(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                    LPSTR pListenerName, PWTSLISTENERCONFIGA pBuffer)
{
  WTSAPI_STUB_CALL_BOOL(QueryListenerConfigA, hServer, pReserved, Reserved, pListenerName,
                        pBuffer);
}
 
BOOL WINAPI WTSCreateListenerW(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                               LPWSTR pListenerName, PWTSLISTENERCONFIGW pBuffer, DWORD flag)
{
  WTSAPI_STUB_CALL_BOOL(CreateListenerW, hServer, pReserved, Reserved, pListenerName, pBuffer,
                        flag);
}
 
BOOL WINAPI WTSCreateListenerA(HANDLE hServer, PVOID pReserved, DWORD Reserved, LPSTR pListenerName,
                               PWTSLISTENERCONFIGA pBuffer, DWORD flag)
{
  WTSAPI_STUB_CALL_BOOL(CreateListenerA, hServer, pReserved, Reserved, pListenerName, pBuffer,
                        flag);
}
 
BOOL WINAPI WTSSetListenerSecurityW(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                    LPWSTR pListenerName, SECURITY_INFORMATION SecurityInformation,
                                    PSECURITY_DESCRIPTOR pSecurityDescriptor)
{
  WTSAPI_STUB_CALL_BOOL(SetListenerSecurityW, hServer, pReserved, Reserved, pListenerName,
                        SecurityInformation, pSecurityDescriptor);
}
 
BOOL WINAPI WTSSetListenerSecurityA(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                    LPSTR pListenerName, SECURITY_INFORMATION SecurityInformation,
                                    PSECURITY_DESCRIPTOR pSecurityDescriptor)
{
  WTSAPI_STUB_CALL_BOOL(SetListenerSecurityA, hServer, pReserved, Reserved, pListenerName,
                        SecurityInformation, pSecurityDescriptor);
}
 
BOOL WINAPI WTSGetListenerSecurityW(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                    LPWSTR pListenerName, SECURITY_INFORMATION SecurityInformation,
                                    PSECURITY_DESCRIPTOR pSecurityDescriptor, DWORD nLength,
                                    LPDWORD lpnLengthNeeded)
{
  WTSAPI_STUB_CALL_BOOL(GetListenerSecurityW, hServer, pReserved, Reserved, pListenerName,
                        SecurityInformation, pSecurityDescriptor, nLength, lpnLengthNeeded);
}
 
BOOL WINAPI WTSGetListenerSecurityA(HANDLE hServer, PVOID pReserved, DWORD Reserved,
                                    LPSTR pListenerName, SECURITY_INFORMATION SecurityInformation,
                                    PSECURITY_DESCRIPTOR pSecurityDescriptor, DWORD nLength,
                                    LPDWORD lpnLengthNeeded)
{
  WTSAPI_STUB_CALL_BOOL(GetListenerSecurityA, hServer, pReserved, Reserved, pListenerName,
                        SecurityInformation, pSecurityDescriptor, nLength, lpnLengthNeeded);
}
 
BOOL CDECL WTSEnableChildSessions(BOOL bEnable)
{
  WTSAPI_STUB_CALL_BOOL(EnableChildSessions, bEnable);
}
 
BOOL CDECL WTSIsChildSessionsEnabled(PBOOL pbEnabled)
{
  WTSAPI_STUB_CALL_BOOL(IsChildSessionsEnabled, pbEnabled);
}
 
BOOL CDECL WTSGetChildSessionId(PULONG pSessionId)
{
  WTSAPI_STUB_CALL_BOOL(GetChildSessionId, pSessionId);
}
 
BOOL CDECL WTSLogonUser(HANDLE hServer, LPCSTR username, LPCSTR password, LPCSTR domain)
{
  WTSAPI_STUB_CALL_BOOL(LogonUser, hServer, username, password, domain);
}
 
BOOL CDECL WTSLogoffUser(HANDLE hServer)
{
  WTSAPI_STUB_CALL_BOOL(LogoffUser, hServer);
}
 
#ifndef _WIN32
 
DWORD WINAPI WTSGetActiveConsoleSessionId(void)
{
  InitOnceExecuteOnce(&wtsapiInitOnce, InitializeWtsApiStubs, NULL, NULL);
 
  if (!g_WtsApi || !g_WtsApi->pGetActiveConsoleSessionId)
    return 0xFFFFFFFF;
 
  return g_WtsApi->pGetActiveConsoleSessionId();
}
 
#endif
 
const CHAR* WTSErrorToString(UINT error)
{
  switch (error)
  {
    case CHANNEL_RC_OK:
      return "CHANNEL_RC_OK";
 
    case CHANNEL_RC_ALREADY_INITIALIZED:
      return "CHANNEL_RC_ALREADY_INITIALIZED";
 
    case CHANNEL_RC_NOT_INITIALIZED:
      return "CHANNEL_RC_NOT_INITIALIZED";
 
    case CHANNEL_RC_ALREADY_CONNECTED:
      return "CHANNEL_RC_ALREADY_CONNECTED";
 
    case CHANNEL_RC_NOT_CONNECTED:
      return "CHANNEL_RC_NOT_CONNECTED";
 
    case CHANNEL_RC_TOO_MANY_CHANNELS:
      return "CHANNEL_RC_TOO_MANY_CHANNELS";
 
    case CHANNEL_RC_BAD_CHANNEL:
      return "CHANNEL_RC_BAD_CHANNEL";
 
    case CHANNEL_RC_BAD_CHANNEL_HANDLE:
      return "CHANNEL_RC_BAD_CHANNEL_HANDLE";
 
    case CHANNEL_RC_NO_BUFFER:
      return "CHANNEL_RC_NO_BUFFER";
 
    case CHANNEL_RC_BAD_INIT_HANDLE:
      return "CHANNEL_RC_BAD_INIT_HANDLE";
 
    case CHANNEL_RC_NOT_OPEN:
      return "CHANNEL_RC_NOT_OPEN";
 
    case CHANNEL_RC_BAD_PROC:
      return "CHANNEL_RC_BAD_PROC";
 
    case CHANNEL_RC_NO_MEMORY:
      return "CHANNEL_RC_NO_MEMORY";
 
    case CHANNEL_RC_UNKNOWN_CHANNEL_NAME:
      return "CHANNEL_RC_UNKNOWN_CHANNEL_NAME";
 
    case CHANNEL_RC_ALREADY_OPEN:
      return "CHANNEL_RC_ALREADY_OPEN";
 
    case CHANNEL_RC_NOT_IN_VIRTUALCHANNELENTRY:
      return "CHANNEL_RC_NOT_IN_VIRTUALCHANNELENTRY";
 
    case CHANNEL_RC_NULL_DATA:
      return "CHANNEL_RC_NULL_DATA";
 
    case CHANNEL_RC_ZERO_LENGTH:
      return "CHANNEL_RC_ZERO_LENGTH";
 
    case CHANNEL_RC_INVALID_INSTANCE:
      return "CHANNEL_RC_INVALID_INSTANCE";
 
    case CHANNEL_RC_UNSUPPORTED_VERSION:
      return "CHANNEL_RC_UNSUPPORTED_VERSION";
 
    case CHANNEL_RC_INITIALIZATION_ERROR:
      return "CHANNEL_RC_INITIALIZATION_ERROR";
 
    default:
      return "UNKNOWN";
  }
}
 
const CHAR* WTSSessionStateToString(WTS_CONNECTSTATE_CLASS state)
{
  switch (state)
  {
    case WTSActive:
      return "WTSActive";
    case WTSConnected:
      return "WTSConnected";
    case WTSConnectQuery:
      return "WTSConnectQuery";
    case WTSShadow:
      return "WTSShadow";
    case WTSDisconnected:
      return "WTSDisconnected";
    case WTSIdle:
      return "WTSIdle";
    case WTSListen:
      return "WTSListen";
    case WTSReset:
      return "WTSReset";
    case WTSDown:
      return "WTSDown";
    case WTSInit:
      return "WTSInit";
    default:
      break;
  }
  return "INVALID_STATE";
}
 
BOOL WTSRegisterWtsApiFunctionTable(const WtsApiFunctionTable* table)
{
  /* Use InitOnceExecuteOnce here as well - otherwise a table set with this
     function is overriden on the first use of a WTS* API call (due to
     wtsapiInitOnce not being set). */
  union
  {
    const void* cpv;
    void* pv;
  } cnv;
  cnv.cpv = table;
  InitOnceExecuteOnce(&wtsapiInitOnce, InitializeWtsApiStubs, cnv.pv, NULL);
  if (!g_WtsApi)
    return FALSE;
  return TRUE;
}
 
static BOOL LoadAndInitialize(char* library)
{
  g_WtsApiModule = LoadLibraryX(library);
 
  if (!g_WtsApiModule)
    return FALSE;
 
  INIT_WTSAPI_FN pInitWtsApi = GetProcAddressAs(g_WtsApiModule, "InitWtsApi", INIT_WTSAPI_FN);
 
  if (!pInitWtsApi)
    return FALSE;
 
  g_WtsApi = pInitWtsApi();
  return TRUE;
}
 
static void InitializeWtsApiStubs_Env(void)
{
  DWORD nSize = 0;
  char* env = NULL;
  LPCSTR wts = "WTSAPI_LIBRARY";
 
  if (g_WtsApi)
    return;
 
  nSize = GetEnvironmentVariableA(wts, NULL, 0);
 
  if (!nSize)
    return;
 
  env = (LPSTR)malloc(nSize);
  if (env)
  {
    if (GetEnvironmentVariableA(wts, env, nSize) == nSize - 1)
      LoadAndInitialize(env);
    free(env);
  }
}
 
#define FREERDS_LIBRARY_NAME "libfreerds-fdsapi.so"
 
static void InitializeWtsApiStubs_FreeRDS(void)
{
  wIniFile* ini = NULL;
  const char* prefix = NULL;
  const char* libdir = NULL;
 
  if (g_WtsApi)
    return;
 
  ini = IniFile_New();
 
  if (IniFile_ReadFile(ini, "/var/run/freerds.instance") < 0)
  {
    IniFile_Free(ini);
    WLog_ERR(TAG, "failed to parse freerds.instance");
    LoadAndInitialize(FREERDS_LIBRARY_NAME);
    return;
  }
 
  prefix = IniFile_GetKeyValueString(ini, "FreeRDS", "prefix");
  libdir = IniFile_GetKeyValueString(ini, "FreeRDS", "libdir");
  WLog_INFO(TAG, "FreeRDS (prefix / libdir): %s / %s", prefix, libdir);
 
  if (prefix && libdir)
  {
    char* prefix_libdir = NULL;
    char* wtsapi_library = NULL;
    prefix_libdir = GetCombinedPath(prefix, libdir);
    wtsapi_library = GetCombinedPath(prefix_libdir, FREERDS_LIBRARY_NAME);
 
    if (wtsapi_library)
    {
      LoadAndInitialize(wtsapi_library);
    }
 
    free(prefix_libdir);
    free(wtsapi_library);
  }
 
  IniFile_Free(ini);
}
 
static BOOL CALLBACK InitializeWtsApiStubs(PINIT_ONCE once, PVOID param, PVOID* context)
{
  WINPR_UNUSED(once);
  WINPR_UNUSED(context);
  if (param)
  {
    g_WtsApi = (const WtsApiFunctionTable*)param;
    return TRUE;
  }
 
  InitializeWtsApiStubs_Env();
 
#ifdef _WIN32
  WtsApi32_InitializeWtsApi();
#endif
 
  if (!g_WtsApi)
    InitializeWtsApiStubs_FreeRDS();
 
  return TRUE;
}