526 lines
12 KiB
C
526 lines
12 KiB
C
#include <windows.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include "hook/hr.h"
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#include "hook/table.h"
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#include "hooklib/path.h"
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/* Helpers */
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static void path_hook_init(void);
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static BOOL path_transform_a(char **out, const char *src);
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static BOOL path_transform_w(wchar_t **out, const wchar_t *src);
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/* API hooks */
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static BOOL WINAPI hook_CreateDirectoryA(
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const char *lpFileName,
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SECURITY_ATTRIBUTES *lpSecurityAttributes);
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static BOOL WINAPI hook_CreateDirectoryW(
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const wchar_t *lpFileName,
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SECURITY_ATTRIBUTES *lpSecurityAttributes);
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static HANDLE WINAPI hook_CreateFileA(
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const char *lpFileName,
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uint32_t dwDesiredAccess,
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uint32_t dwShareMode,
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SECURITY_ATTRIBUTES *lpSecurityAttributes,
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uint32_t dwCreationDisposition,
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uint32_t dwFlagsAndAttributes,
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HANDLE hTemplateFile);
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static HANDLE WINAPI hook_CreateFileW(
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const wchar_t *lpFileName,
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uint32_t dwDesiredAccess,
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uint32_t dwShareMode,
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SECURITY_ATTRIBUTES *lpSecurityAttributes,
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uint32_t dwCreationDisposition,
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uint32_t dwFlagsAndAttributes,
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HANDLE hTemplateFile);
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static DWORD WINAPI hook_GetFileAttributesA(const char *lpFileName);
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static DWORD WINAPI hook_GetFileAttributesW(const wchar_t *lpFileName);
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static BOOL WINAPI hook_GetFileAttributesExA(
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const char *lpFileName,
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GET_FILEEX_INFO_LEVELS fInfoLevelId,
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void *lpFileInformation);
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static BOOL WINAPI hook_GetFileAttributesExW(
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const wchar_t *lpFileName,
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GET_FILEEX_INFO_LEVELS fInfoLevelId,
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void *lpFileInformation);
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/* Link pointers */
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static BOOL WINAPI (*next_CreateDirectoryA)(
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const char *lpFileName,
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SECURITY_ATTRIBUTES *lpSecurityAttributes);
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static BOOL WINAPI (*next_CreateDirectoryW)(
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const wchar_t *lpFileName,
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SECURITY_ATTRIBUTES *lpSecurityAttributes);
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static HANDLE WINAPI (*next_CreateFileA)(
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const char *lpFileName,
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uint32_t dwDesiredAccess,
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uint32_t dwShareMode,
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SECURITY_ATTRIBUTES *lpSecurityAttributes,
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uint32_t dwCreationDisposition,
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uint32_t dwFlagsAndAttributes,
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HANDLE hTemplateFile);
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static HANDLE WINAPI (*next_CreateFileW)(
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const wchar_t *lpFileName,
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uint32_t dwDesiredAccess,
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uint32_t dwShareMode,
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SECURITY_ATTRIBUTES *lpSecurityAttributes,
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uint32_t dwCreationDisposition,
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uint32_t dwFlagsAndAttributes,
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HANDLE hTemplateFile);
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static DWORD WINAPI (*next_GetFileAttributesA)(const char *lpFileName);
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static DWORD WINAPI (*next_GetFileAttributesW)(const wchar_t *lpFileName);
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static BOOL WINAPI (*next_GetFileAttributesExA)(
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const char *lpFileName,
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GET_FILEEX_INFO_LEVELS fInfoLevelId,
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void *lpFileInformation);
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static BOOL WINAPI (*next_GetFileAttributesExW)(
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const wchar_t *lpFileName,
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GET_FILEEX_INFO_LEVELS fInfoLevelId,
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void *lpFileInformation);
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/* Hook table */
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static const struct hook_symbol path_hook_syms[] = {
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{
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.name = "CreateDirectoryA",
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.patch = hook_CreateDirectoryA,
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.link = (void **) &next_CreateDirectoryA,
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}, {
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.name = "CreateDirectoryW",
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.patch = hook_CreateDirectoryW,
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.link = (void **) &next_CreateDirectoryW,
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}, {
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.name = "CreateFileA",
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.patch = hook_CreateFileA,
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.link = (void **) &next_CreateFileA,
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}, {
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.name = "CreateFileW",
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.patch = hook_CreateFileW,
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.link = (void **) &next_CreateFileW,
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}, {
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.name = "GetFileAttributesA",
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.patch = hook_GetFileAttributesA,
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.link = (void **) &next_GetFileAttributesA,
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}, {
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.name = "GetFileAttributesW",
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.patch = hook_GetFileAttributesW,
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.link = (void **) &next_GetFileAttributesW,
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}, {
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.name = "GetFileAttributesExA",
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.patch = hook_GetFileAttributesExA,
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.link = (void **) &next_GetFileAttributesExA,
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}, {
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.name = "GetFileAttributesExW",
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.patch = hook_GetFileAttributesExW,
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.link = (void **) &next_GetFileAttributesExW,
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}
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};
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static bool path_hook_initted;
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static CRITICAL_SECTION path_hook_lock;
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static path_hook_t *path_hook_list;
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static size_t path_hook_count;
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HRESULT path_hook_push(path_hook_t hook)
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{
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path_hook_t *tmp;
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HRESULT hr;
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assert(hook != NULL);
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path_hook_init();
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EnterCriticalSection(&path_hook_lock);
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tmp = realloc(
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path_hook_list,
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(path_hook_count + 1) * sizeof(path_hook_t));
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if (tmp == NULL) {
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hr = E_OUTOFMEMORY;
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goto end;
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}
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path_hook_list = tmp;
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path_hook_list[path_hook_count++] = hook;
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hr = S_OK;
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end:
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LeaveCriticalSection(&path_hook_lock);
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return hr;
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}
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static void path_hook_init(void)
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{
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/* Init is not thread safe because API hook init is not thread safe blah
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blah blah you know the drill by now. */
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if (path_hook_initted) {
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return;
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}
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path_hook_initted = true;
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InitializeCriticalSection(&path_hook_lock);
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hook_table_apply(
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NULL,
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"kernel32.dll",
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path_hook_syms,
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_countof(path_hook_syms));
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}
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static BOOL path_transform_a(char **out, const char *src)
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{
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wchar_t *src_w;
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size_t src_c;
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wchar_t *dest_w;
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char *dest_a;
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size_t dest_s;
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BOOL ok;
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assert(out != NULL);
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src_w = NULL;
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dest_w = NULL;
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dest_a = NULL;
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*out = NULL;
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if (src == NULL) {
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SetLastError(ERROR_INVALID_PARAMETER);
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ok = FALSE;
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goto end;
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}
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/* Widen the path */
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mbstowcs_s(&src_c, NULL, 0, src, 0);
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src_w = malloc(src_c * sizeof(wchar_t));
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if (src_w == NULL) {
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SetLastError(ERROR_OUTOFMEMORY);
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ok = FALSE;
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goto end;
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}
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mbstowcs_s(NULL, src_w, src_c, src, src_c - 1);
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/* Try applying a path transform */
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ok = path_transform_w(&dest_w, src_w); /* Take ownership! */
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if (!ok || dest_w == NULL) {
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goto end;
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}
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/* Narrow the transformed path */
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wcstombs_s(&dest_s, NULL, 0, dest_w, 0);
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dest_a = malloc(dest_s * sizeof(char));
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if (dest_a == NULL) {
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SetLastError(ERROR_OUTOFMEMORY);
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ok = FALSE;
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goto end;
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}
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wcstombs_s(NULL, dest_a, dest_s, dest_w, dest_s - 1);
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*out = dest_a; /* Relinquish ownership to caller! */
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ok = TRUE;
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end:
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free(dest_w);
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free(src_w);
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return ok;
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}
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static BOOL path_transform_w(wchar_t **out, const wchar_t *src)
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{
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BOOL ok;
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HRESULT hr;
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wchar_t *dest;
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size_t dest_c;
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size_t i;
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assert(out != NULL);
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dest = NULL;
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*out = NULL;
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EnterCriticalSection(&path_hook_lock);
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for (i = 0 ; i < path_hook_count ; i++) {
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hr = path_hook_list[i](src, NULL, &dest_c);
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if (FAILED(hr)) {
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ok = hr_propagate_win32(hr, FALSE);
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goto end;
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}
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if (hr == S_FALSE) {
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continue;
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}
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dest = malloc(dest_c * sizeof(wchar_t));
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if (dest == NULL) {
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SetLastError(ERROR_OUTOFMEMORY);
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ok = FALSE;
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goto end;
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}
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hr = path_hook_list[i](src, dest, &dest_c);
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if (FAILED(hr)) {
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ok = hr_propagate_win32(hr, FALSE);
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goto end;
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}
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break;
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}
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*out = dest;
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dest = NULL;
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ok = TRUE;
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end:
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LeaveCriticalSection(&path_hook_lock);
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free(dest);
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return ok;
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}
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/* Dumping ground for kernel32 file system ops whose path parameters we have to
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hook into and translate. This list will grow over time as we go back and
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fix up older games that don't pay attention to the mount point registry. */
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static BOOL WINAPI hook_CreateDirectoryA(
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const char *lpFileName,
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SECURITY_ATTRIBUTES *lpSecurityAttributes)
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{
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char *trans;
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BOOL ok;
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ok = path_transform_a(&trans, lpFileName);
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if (!ok) {
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return FALSE;
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}
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ok = next_CreateDirectoryA(
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trans ? trans : lpFileName,
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lpSecurityAttributes);
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free(trans);
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return ok;
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}
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static BOOL WINAPI hook_CreateDirectoryW(
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const wchar_t *lpFileName,
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SECURITY_ATTRIBUTES *lpSecurityAttributes)
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{
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wchar_t *trans;
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BOOL ok;
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ok = path_transform_w(&trans, lpFileName);
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if (!ok) {
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return FALSE;
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}
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ok = next_CreateDirectoryW(
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trans ? trans : lpFileName,
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lpSecurityAttributes);
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free(trans);
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return ok;
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}
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/* Don't pull in the entire iohook framework just for CreateFileA/CreateFileW */
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static HANDLE WINAPI hook_CreateFileA(
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const char *lpFileName,
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uint32_t dwDesiredAccess,
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uint32_t dwShareMode,
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SECURITY_ATTRIBUTES *lpSecurityAttributes,
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uint32_t dwCreationDisposition,
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uint32_t dwFlagsAndAttributes,
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HANDLE hTemplateFile)
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{
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char *trans;
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HANDLE result;
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BOOL ok;
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ok = path_transform_a(&trans, lpFileName);
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if (!ok) {
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return INVALID_HANDLE_VALUE;
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}
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result = next_CreateFileA(
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trans ? trans : lpFileName,
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dwDesiredAccess,
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dwShareMode,
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lpSecurityAttributes,
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dwCreationDisposition,
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dwFlagsAndAttributes,
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hTemplateFile);
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free(trans);
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return result;
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}
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static HANDLE WINAPI hook_CreateFileW(
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const wchar_t *lpFileName,
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uint32_t dwDesiredAccess,
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uint32_t dwShareMode,
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SECURITY_ATTRIBUTES *lpSecurityAttributes,
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uint32_t dwCreationDisposition,
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uint32_t dwFlagsAndAttributes,
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HANDLE hTemplateFile)
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{
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wchar_t *trans;
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HANDLE result;
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BOOL ok;
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ok = path_transform_w(&trans, lpFileName);
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if (!ok) {
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return INVALID_HANDLE_VALUE;
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}
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result = next_CreateFileW(
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trans ? trans : lpFileName,
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dwDesiredAccess,
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dwShareMode,
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lpSecurityAttributes,
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dwCreationDisposition,
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dwFlagsAndAttributes,
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hTemplateFile);
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free(trans);
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return result;
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}
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static DWORD WINAPI hook_GetFileAttributesA(const char *lpFileName)
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{
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char *trans;
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DWORD result;
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BOOL ok;
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ok = path_transform_a(&trans, lpFileName);
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if (!ok) {
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return INVALID_FILE_ATTRIBUTES;
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}
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result = next_GetFileAttributesA(trans ? trans : lpFileName);
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free(trans);
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return result;
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}
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static DWORD WINAPI hook_GetFileAttributesW(const wchar_t *lpFileName)
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{
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wchar_t *trans;
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DWORD result;
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BOOL ok;
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ok = path_transform_w(&trans, lpFileName);
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if (!ok) {
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return INVALID_FILE_ATTRIBUTES;
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}
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result = next_GetFileAttributesW(trans ? trans : lpFileName);
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free(trans);
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return result;
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}
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static BOOL WINAPI hook_GetFileAttributesExA(
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const char *lpFileName,
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GET_FILEEX_INFO_LEVELS fInfoLevelId,
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void *lpFileInformation)
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{
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char *trans;
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BOOL ok;
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ok = path_transform_a(&trans, lpFileName);
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if (!ok) {
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return INVALID_FILE_ATTRIBUTES;
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}
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ok = next_GetFileAttributesExA(
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trans ? trans : lpFileName,
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fInfoLevelId,
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lpFileInformation);
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free(trans);
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return ok;
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}
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static BOOL WINAPI hook_GetFileAttributesExW(
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const wchar_t *lpFileName,
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GET_FILEEX_INFO_LEVELS fInfoLevelId,
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void *lpFileInformation)
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{
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wchar_t *trans;
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BOOL ok;
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ok = path_transform_w(&trans, lpFileName);
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if (!ok) {
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return INVALID_FILE_ATTRIBUTES;
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}
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ok = next_GetFileAttributesExW(
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trans ? trans : lpFileName,
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fInfoLevelId,
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lpFileInformation);
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free(trans);
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return ok;
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}
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