2 * winmisc.c: miscellaneous Windows-specific things
10 OSVERSIONINFO osVersion
;
12 char *platform_get_x_display(void) {
13 /* We may as well check for DISPLAY in case it's useful. */
14 return dupstr(getenv("DISPLAY"));
17 Filename
*filename_from_str(const char *str
)
19 Filename
*ret
= snew(Filename
);
20 ret
->path
= dupstr(str
);
24 Filename
*filename_copy(const Filename
*fn
)
26 return filename_from_str(fn
->path
);
29 const char *filename_to_str(const Filename
*fn
)
34 int filename_equal(const Filename
*f1
, const Filename
*f2
)
36 return !strcmp(f1
->path
, f2
->path
);
39 int filename_is_null(const Filename
*fn
)
44 void filename_free(Filename
*fn
)
50 int filename_serialise(const Filename
*f
, void *vdata
)
52 char *data
= (char *)vdata
;
53 int len
= strlen(f
->path
) + 1; /* include trailing NUL */
55 strcpy(data
, f
->path
);
59 Filename
*filename_deserialise(void *vdata
, int maxsize
, int *used
)
61 char *data
= (char *)vdata
;
63 end
= memchr(data
, '\0', maxsize
);
68 return filename_from_str(data
);
71 #ifndef NO_SECUREZEROMEMORY
73 * Windows implementation of smemclr (see misc.c) using SecureZeroMemory.
75 void smemclr(void *b
, size_t n
) {
77 SecureZeroMemory(b
, n
);
81 char *get_username(void)
85 int got_username
= FALSE
;
86 DECL_WINDOWS_FUNCTION(static, BOOLEAN
, GetUserNameExA
,
87 (EXTENDED_NAME_FORMAT
, LPSTR
, PULONG
));
90 static int tried_usernameex
= FALSE
;
91 if (!tried_usernameex
) {
92 /* Not available on Win9x, so load dynamically */
93 HMODULE secur32
= load_system32_dll("secur32.dll");
94 GET_WINDOWS_FUNCTION(secur32
, GetUserNameExA
);
95 tried_usernameex
= TRUE
;
99 if (p_GetUserNameExA
) {
101 * If available, use the principal -- this avoids the problem
102 * that the local username is case-insensitive but Kerberos
103 * usernames are case-sensitive.
108 (void) p_GetUserNameExA(NameUserPrincipal
, NULL
, &namelen
);
110 user
= snewn(namelen
, char);
111 got_username
= p_GetUserNameExA(NameUserPrincipal
, user
, &namelen
);
113 char *p
= strchr(user
, '@');
121 /* Fall back to local user name */
123 if (GetUserName(NULL
, &namelen
) == FALSE
) {
125 * Apparently this doesn't work at least on Windows XP SP2.
126 * Thus assume a maximum of 256. It will fail again if it
132 user
= snewn(namelen
, char);
133 got_username
= GetUserName(user
, &namelen
);
139 return got_username ? user
: NULL
;
142 BOOL
init_winver(void)
144 ZeroMemory(&osVersion
, sizeof(osVersion
));
145 osVersion
.dwOSVersionInfoSize
= sizeof (OSVERSIONINFO
);
146 return GetVersionEx ( (OSVERSIONINFO
*) &osVersion
);
149 HMODULE
load_system32_dll(const char *libname
)
152 * Wrapper function to load a DLL out of c:\windows\system32
153 * without going through the full DLL search path. (Hence no
154 * attack is possible by placing a substitute DLL earlier on that
157 static char *sysdir
= NULL
;
164 size
= 3*size
/2 + 512;
165 sysdir
= sresize(sysdir
, size
, char);
166 len
= GetSystemDirectory(sysdir
, size
);
167 } while (len
>= size
);
170 fullpath
= dupcat(sysdir
, "\\", libname
, NULL
);
171 ret
= LoadLibrary(fullpath
);
177 static FILE *debug_fp
= NULL
;
178 static HANDLE debug_hdl
= INVALID_HANDLE_VALUE
;
179 static int debug_got_console
= 0;
181 void dputs(char *buf
)
185 if (!debug_got_console
) {
186 if (AllocConsole()) {
187 debug_got_console
= 1;
188 debug_hdl
= GetStdHandle(STD_OUTPUT_HANDLE
);
192 debug_fp
= fopen("debug.log", "w");
195 if (debug_hdl
!= INVALID_HANDLE_VALUE
) {
196 WriteFile(debug_hdl
, buf
, strlen(buf
), &dw
, NULL
);
198 fputs(buf
, debug_fp
);
205 * Minefield - a Windows equivalent for Electric Fence
208 #define PAGESIZE 4096
213 * We start by reserving as much virtual address space as Windows
214 * will sensibly (or not sensibly) let us have. We flag it all as
217 * Any allocation attempt is satisfied by committing one or more
218 * pages, with an uncommitted page on either side. The returned
219 * memory region is jammed up against the _end_ of the pages.
221 * Freeing anything causes instantaneous decommitment of the pages
222 * involved, so stale pointers are caught as soon as possible.
225 static int minefield_initialised
= 0;
226 static void *minefield_region
= NULL
;
227 static long minefield_size
= 0;
228 static long minefield_npages
= 0;
229 static long minefield_curpos
= 0;
230 static unsigned short *minefield_admin
= NULL
;
231 static void *minefield_pages
= NULL
;
233 static void minefield_admin_hide(int hide
)
235 int access
= hide ? PAGE_NOACCESS
: PAGE_READWRITE
;
236 VirtualProtect(minefield_admin
, minefield_npages
* 2, access
, NULL
);
239 static void minefield_init(void)
245 for (size
= 0x40000000; size
> 0; size
= ((size
>> 3) * 7) & ~0xFFF) {
246 minefield_region
= VirtualAlloc(NULL
, size
,
247 MEM_RESERVE
, PAGE_NOACCESS
);
248 if (minefield_region
)
251 minefield_size
= size
;
254 * Firstly, allocate a section of that to be the admin block.
255 * We'll need a two-byte field for each page.
257 minefield_admin
= minefield_region
;
258 minefield_npages
= minefield_size
/ PAGESIZE
;
259 admin_size
= (minefield_npages
* 2 + PAGESIZE
- 1) & ~(PAGESIZE
- 1);
260 minefield_npages
= (minefield_size
- admin_size
) / PAGESIZE
;
261 minefield_pages
= (char *) minefield_region
+ admin_size
;
264 * Commit the admin region.
266 VirtualAlloc(minefield_admin
, minefield_npages
* 2,
267 MEM_COMMIT
, PAGE_READWRITE
);
270 * Mark all pages as unused (0xFFFF).
272 for (i
= 0; i
< minefield_npages
; i
++)
273 minefield_admin
[i
] = 0xFFFF;
276 * Hide the admin region.
278 minefield_admin_hide(1);
280 minefield_initialised
= 1;
283 static void minefield_bomb(void)
285 div(1, *(int *) minefield_pages
);
288 static void *minefield_alloc(int size
)
291 int pos
, lim
, region_end
, region_start
;
295 npages
= (size
+ PAGESIZE
- 1) / PAGESIZE
;
297 minefield_admin_hide(0);
300 * Search from current position until we find a contiguous
301 * bunch of npages+2 unused pages.
303 pos
= minefield_curpos
;
304 lim
= minefield_npages
;
306 /* Skip over used pages. */
307 while (pos
< lim
&& minefield_admin
[pos
] != 0xFFFF)
309 /* Count unused pages. */
311 while (pos
< lim
&& pos
- start
< npages
+ 2 &&
312 minefield_admin
[pos
] == 0xFFFF)
314 if (pos
- start
== npages
+ 2)
316 /* If we've reached the limit, reset the limit or stop. */
318 if (lim
== minefield_npages
) {
319 /* go round and start again at zero */
320 lim
= minefield_curpos
;
323 minefield_admin_hide(1);
329 minefield_curpos
= pos
- 1;
332 * We have npages+2 unused pages starting at start. We leave
333 * the first and last of these alone and use the rest.
335 region_end
= (start
+ npages
+ 1) * PAGESIZE
;
336 region_start
= region_end
- size
;
337 /* FIXME: could align here if we wanted */
340 * Update the admin region.
342 for (i
= start
+ 2; i
< start
+ npages
+ 1; i
++)
343 minefield_admin
[i
] = 0xFFFE; /* used but no region starts here */
344 minefield_admin
[start
+ 1] = region_start
% PAGESIZE
;
346 minefield_admin_hide(1);
348 VirtualAlloc((char *) minefield_pages
+ region_start
, size
,
349 MEM_COMMIT
, PAGE_READWRITE
);
350 return (char *) minefield_pages
+ region_start
;
353 static void minefield_free(void *ptr
)
355 int region_start
, i
, j
;
357 minefield_admin_hide(0);
359 region_start
= (char *) ptr
- (char *) minefield_pages
;
360 i
= region_start
/ PAGESIZE
;
361 if (i
< 0 || i
>= minefield_npages
||
362 minefield_admin
[i
] != region_start
% PAGESIZE
)
364 for (j
= i
; j
< minefield_npages
&& minefield_admin
[j
] != 0xFFFF; j
++) {
365 minefield_admin
[j
] = 0xFFFF;
368 VirtualFree(ptr
, j
* PAGESIZE
- region_start
, MEM_DECOMMIT
);
370 minefield_admin_hide(1);
373 static int minefield_get_size(void *ptr
)
375 int region_start
, i
, j
;
377 minefield_admin_hide(0);
379 region_start
= (char *) ptr
- (char *) minefield_pages
;
380 i
= region_start
/ PAGESIZE
;
381 if (i
< 0 || i
>= minefield_npages
||
382 minefield_admin
[i
] != region_start
% PAGESIZE
)
384 for (j
= i
; j
< minefield_npages
&& minefield_admin
[j
] != 0xFFFF; j
++);
386 minefield_admin_hide(1);
388 return j
* PAGESIZE
- region_start
;
391 void *minefield_c_malloc(size_t size
)
393 if (!minefield_initialised
)
395 return minefield_alloc(size
);
398 void minefield_c_free(void *p
)
400 if (!minefield_initialised
)
406 * realloc _always_ moves the chunk, for rapid detection of code
407 * that assumes it won't.
409 void *minefield_c_realloc(void *p
, size_t size
)
413 if (!minefield_initialised
)
415 q
= minefield_alloc(size
);
416 oldsize
= minefield_get_size(p
);
417 memcpy(q
, p
, (oldsize
< size ? oldsize
: size
));
422 #endif /* MINEFIELD */
424 FontSpec
*fontspec_new(const char *name
,
425 int bold
, int height
, int charset
)
427 FontSpec
*f
= snew(FontSpec
);
428 f
->name
= dupstr(name
);
431 f
->charset
= charset
;
434 FontSpec
*fontspec_copy(const FontSpec
*f
)
436 return fontspec_new(f
->name
, f
->isbold
, f
->height
, f
->charset
);
438 void fontspec_free(FontSpec
*f
)
443 int fontspec_serialise(FontSpec
*f
, void *vdata
)
445 char *data
= (char *)vdata
;
446 int len
= strlen(f
->name
) + 1; /* include trailing NUL */
448 strcpy(data
, f
->name
);
449 PUT_32BIT_MSB_FIRST(data
+ len
, f
->isbold
);
450 PUT_32BIT_MSB_FIRST(data
+ len
+ 4, f
->height
);
451 PUT_32BIT_MSB_FIRST(data
+ len
+ 8, f
->charset
);
453 return len
+ 12; /* also include three 4-byte ints */
455 FontSpec
*fontspec_deserialise(void *vdata
, int maxsize
, int *used
)
457 char *data
= (char *)vdata
;
461 end
= memchr(data
, '\0', maxsize
-12);
465 *used
= end
- data
+ 12;
466 return fontspec_new(data
,
467 GET_32BIT_MSB_FIRST(end
),
468 GET_32BIT_MSB_FIRST(end
+ 4),
469 GET_32BIT_MSB_FIRST(end
+ 8));