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));