272 lines
8.1 KiB
C
272 lines
8.1 KiB
C
/*
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* Copyright 2021-2022 David Xanatos, xanasoft.com
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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 3 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, see <https://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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// Handle
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//---------------------------------------------------------------------------
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#define NOGDI
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#include "dll.h"
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#include "handle.h"
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#include <stdio.h>
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#include "debug.h"
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#include "common/pool.h"
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#include "common/map.h"
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//---------------------------------------------------------------------------
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// Structures and Types
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//---------------------------------------------------------------------------
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typedef struct _HANDLE_STATE {
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BOOLEAN DeleteOnClose;
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P_CloseHandler CloseHandlers[MAX_CLOSE_HANDLERS];
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WCHAR* RelocationPath;
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} HANDLE_STATE;
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//---------------------------------------------------------------------------
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// Variables
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//---------------------------------------------------------------------------
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extern POOL* Dll_Pool;
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static HASH_MAP Handle_StatusData;
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static CRITICAL_SECTION Handle_StatusData_CritSec;
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//---------------------------------------------------------------------------
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// Functions
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Handle_Init
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//---------------------------------------------------------------------------
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_FX BOOLEAN Handle_Init(void)
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{
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InitializeCriticalSection(&Handle_StatusData_CritSec);
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map_init(&Handle_StatusData, Dll_Pool);
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return TRUE;
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}
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//---------------------------------------------------------------------------
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// Handle_SetDeleteOnClose
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//---------------------------------------------------------------------------
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_FX VOID Handle_SetDeleteOnClose(HANDLE FileHandle, BOOLEAN DeleteOnClose)
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{
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EnterCriticalSection(&Handle_StatusData_CritSec);
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HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
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if (!state) {
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state = map_insert(&Handle_StatusData, FileHandle, NULL, sizeof(HANDLE_STATE));
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}
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state->DeleteOnClose = DeleteOnClose;
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LeaveCriticalSection(&Handle_StatusData_CritSec);
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}
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//---------------------------------------------------------------------------
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// Handle_SetRelocationPath
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//---------------------------------------------------------------------------
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_FX VOID Handle_SetRelocationPath(HANDLE FileHandle, WCHAR* RelocationPath)
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{
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EnterCriticalSection(&Handle_StatusData_CritSec);
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HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
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if (!state) { // this shoudl always be the case, as we only use Handle_SetRelocationPath when the handle is first created
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state = map_insert(&Handle_StatusData, FileHandle, NULL, sizeof(HANDLE_STATE));
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} else if (state->RelocationPath) Dll_Free(state->RelocationPath); // should not happen but in case
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state->RelocationPath = Dll_Alloc((wcslen(RelocationPath) + 1) * sizeof(WCHAR));
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wcscpy(state->RelocationPath, RelocationPath);
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LeaveCriticalSection(&Handle_StatusData_CritSec);
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}
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//---------------------------------------------------------------------------
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// Handle_GetRelocationPath
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//---------------------------------------------------------------------------
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_FX WCHAR* Handle_GetRelocationPath(HANDLE FileHandle, ULONG ExtraLength)
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{
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WCHAR* name = NULL;
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EnterCriticalSection(&Handle_StatusData_CritSec);
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HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
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if (state && state->RelocationPath) {
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THREAD_DATA *TlsData = Dll_GetTlsData(NULL);
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ULONG length = (wcslen(state->RelocationPath) + 1) * sizeof(WCHAR);
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name = Dll_GetTlsNameBuffer(TlsData, TRUE_NAME_BUFFER, length + ExtraLength);
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wcscpy(name, state->RelocationPath);
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}
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LeaveCriticalSection(&Handle_StatusData_CritSec);
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return name;
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}
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//---------------------------------------------------------------------------
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// Handle_FreeCloseHandler
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//---------------------------------------------------------------------------
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_FX BOOLEAN Handle_FreeCloseHandler(HANDLE FileHandle, P_CloseHandler* CloseHandlers, BOOLEAN* DeleteOnClose)
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{
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BOOLEAN HasCloseHandlers = FALSE;
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EnterCriticalSection(&Handle_StatusData_CritSec);
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HANDLE_STATE* state = (HANDLE_STATE*)map_get(&Handle_StatusData, FileHandle);
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if (state) {
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HasCloseHandlers = TRUE;
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if(CloseHandlers)
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memcpy(CloseHandlers, state->CloseHandlers, MAX_CLOSE_HANDLERS * sizeof(P_CloseHandler));
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if(DeleteOnClose) *DeleteOnClose = state->DeleteOnClose;
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if (state->RelocationPath) Dll_Free(state->RelocationPath);
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}
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map_remove(&Handle_StatusData, FileHandle);
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LeaveCriticalSection(&Handle_StatusData_CritSec);
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return HasCloseHandlers;
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}
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//---------------------------------------------------------------------------
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// Handle_RegisterCloseHandler
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//---------------------------------------------------------------------------
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_FX BOOLEAN Handle_RegisterCloseHandler(HANDLE FileHandle, P_CloseHandler CloseHandler)
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{
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if (!FileHandle || FileHandle == (HANDLE)-1)
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return FALSE;
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ULONG i;
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EnterCriticalSection(&Handle_StatusData_CritSec);
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HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
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if (!state) {
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state = map_insert(&Handle_StatusData, FileHandle, NULL, sizeof(HANDLE_STATE));
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}
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for (i = 0; i < MAX_CLOSE_HANDLERS; i++) {
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if (state->CloseHandlers[i] == CloseHandler)
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break; // already registered
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if (state->CloseHandlers[i] == NULL) {
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state->CloseHandlers[i] = CloseHandler; // set to empty slot
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break;
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}
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}
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LeaveCriticalSection(&Handle_StatusData_CritSec);
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if (i == MAX_CLOSE_HANDLERS) {
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SbieApi_Log(2301, L"No free CloseHandlers slot available");
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return FALSE;
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}
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return TRUE;
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}
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//---------------------------------------------------------------------------
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// Handle_UnRegisterCloseHandler
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//---------------------------------------------------------------------------
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_FX BOOLEAN Handle_UnRegisterCloseHandler(HANDLE FileHandle, P_CloseHandler CloseHandler)
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{
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ULONG i = MAX_CLOSE_HANDLERS;
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EnterCriticalSection(&Handle_StatusData_CritSec);
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HANDLE_STATE* state = map_get(&Handle_StatusData, FileHandle);
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if (state) {
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for (i = 0; i < MAX_CLOSE_HANDLERS; i++) {
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if (state->CloseHandlers[i] == CloseHandler) {
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state->CloseHandlers[i] = NULL; // clear slot
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break;
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}
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}
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}
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LeaveCriticalSection(&Handle_StatusData_CritSec);
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return i != MAX_CLOSE_HANDLERS;
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}
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//---------------------------------------------------------------------------
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// Handle_SetupDuplicate
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//---------------------------------------------------------------------------
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_FX void Handle_SetupDuplicate(HANDLE OldFileHandle, HANDLE NewFileHandle)
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{
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ULONG i;
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EnterCriticalSection(&Handle_StatusData_CritSec);
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HANDLE_STATE* state = map_get(&Handle_StatusData, OldFileHandle);
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if (state) {
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if(state->RelocationPath)
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Handle_SetRelocationPath(NewFileHandle, state->RelocationPath);
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// todo: add a flag to each CloseHandlers entry to indicate if it should be propagated or not
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BOOLEAN found = FALSE;
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for (i = 0; i < MAX_CLOSE_HANDLERS; i++) {
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if (state->CloseHandlers[i] == File_NotifyRecover) {
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found = TRUE;
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break;
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}
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}
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if(found)
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Handle_RegisterCloseHandler(NewFileHandle, File_NotifyRecover);
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}
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LeaveCriticalSection(&Handle_StatusData_CritSec);
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}
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