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);
72 * Windows implementation of smemclr (see misc.c) using SecureZeroMemory.
74 void smemclr(void *b, size_t n) {
76 SecureZeroMemory(b, n);
79 char *get_username(void)
83 int got_username = FALSE;
84 DECL_WINDOWS_FUNCTION(static, BOOLEAN, GetUserNameExA,
85 (EXTENDED_NAME_FORMAT, LPSTR, PULONG));
88 static int tried_usernameex = FALSE;
89 if (!tried_usernameex) {
90 /* Not available on Win9x, so load dynamically */
91 HMODULE secur32 = load_system32_dll("secur32.dll");
92 GET_WINDOWS_FUNCTION(secur32, GetUserNameExA);
93 tried_usernameex = TRUE;
97 if (p_GetUserNameExA) {
99 * If available, use the principal -- this avoids the problem
100 * that the local username is case-insensitive but Kerberos
101 * usernames are case-sensitive.
106 (void) p_GetUserNameExA(NameUserPrincipal, NULL, &namelen);
108 user = snewn(namelen, char);
109 got_username = p_GetUserNameExA(NameUserPrincipal, user, &namelen);
111 char *p = strchr(user, '@');
119 /* Fall back to local user name */
121 if (GetUserName(NULL, &namelen) == FALSE) {
123 * Apparently this doesn't work at least on Windows XP SP2.
124 * Thus assume a maximum of 256. It will fail again if it
130 user = snewn(namelen, char);
131 got_username = GetUserName(user, &namelen);
137 return got_username ? user : NULL;
140 BOOL init_winver(void)
142 ZeroMemory(&osVersion, sizeof(osVersion));
143 osVersion.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
144 return GetVersionEx ( (OSVERSIONINFO *) &osVersion);
147 HMODULE load_system32_dll(const char *libname)
150 * Wrapper function to load a DLL out of c:\windows\system32
151 * without going through the full DLL search path. (Hence no
152 * attack is possible by placing a substitute DLL earlier on that
155 static char *sysdir = NULL;
162 size = 3*size/2 + 512;
163 sysdir = sresize(sysdir, size, char);
164 len = GetSystemDirectory(sysdir, size);
165 } while (len >= size);
168 fullpath = dupcat(sysdir, "\\", libname, NULL);
169 ret = LoadLibrary(fullpath);
175 static FILE *debug_fp = NULL;
176 static HANDLE debug_hdl = INVALID_HANDLE_VALUE;
177 static int debug_got_console = 0;
179 void dputs(char *buf)
183 if (!debug_got_console) {
184 if (AllocConsole()) {
185 debug_got_console = 1;
186 debug_hdl = GetStdHandle(STD_OUTPUT_HANDLE);
190 debug_fp = fopen("debug.log", "w");
193 if (debug_hdl != INVALID_HANDLE_VALUE) {
194 WriteFile(debug_hdl, buf, strlen(buf), &dw, NULL);
196 fputs(buf, debug_fp);
203 * Minefield - a Windows equivalent for Electric Fence
206 #define PAGESIZE 4096
211 * We start by reserving as much virtual address space as Windows
212 * will sensibly (or not sensibly) let us have. We flag it all as
215 * Any allocation attempt is satisfied by committing one or more
216 * pages, with an uncommitted page on either side. The returned
217 * memory region is jammed up against the _end_ of the pages.
219 * Freeing anything causes instantaneous decommitment of the pages
220 * involved, so stale pointers are caught as soon as possible.
223 static int minefield_initialised = 0;
224 static void *minefield_region = NULL;
225 static long minefield_size = 0;
226 static long minefield_npages = 0;
227 static long minefield_curpos = 0;
228 static unsigned short *minefield_admin = NULL;
229 static void *minefield_pages = NULL;
231 static void minefield_admin_hide(int hide)
233 int access = hide ? PAGE_NOACCESS : PAGE_READWRITE;
234 VirtualProtect(minefield_admin, minefield_npages * 2, access, NULL);
237 static void minefield_init(void)
243 for (size = 0x40000000; size > 0; size = ((size >> 3) * 7) & ~0xFFF) {
244 minefield_region = VirtualAlloc(NULL, size,
245 MEM_RESERVE, PAGE_NOACCESS);
246 if (minefield_region)
249 minefield_size = size;
252 * Firstly, allocate a section of that to be the admin block.
253 * We'll need a two-byte field for each page.
255 minefield_admin = minefield_region;
256 minefield_npages = minefield_size / PAGESIZE;
257 admin_size = (minefield_npages * 2 + PAGESIZE - 1) & ~(PAGESIZE - 1);
258 minefield_npages = (minefield_size - admin_size) / PAGESIZE;
259 minefield_pages = (char *) minefield_region + admin_size;
262 * Commit the admin region.
264 VirtualAlloc(minefield_admin, minefield_npages * 2,
265 MEM_COMMIT, PAGE_READWRITE);
268 * Mark all pages as unused (0xFFFF).
270 for (i = 0; i < minefield_npages; i++)
271 minefield_admin[i] = 0xFFFF;
274 * Hide the admin region.
276 minefield_admin_hide(1);
278 minefield_initialised = 1;
281 static void minefield_bomb(void)
283 div(1, *(int *) minefield_pages);
286 static void *minefield_alloc(int size)
289 int pos, lim, region_end, region_start;
293 npages = (size + PAGESIZE - 1) / PAGESIZE;
295 minefield_admin_hide(0);
298 * Search from current position until we find a contiguous
299 * bunch of npages+2 unused pages.
301 pos = minefield_curpos;
302 lim = minefield_npages;
304 /* Skip over used pages. */
305 while (pos < lim && minefield_admin[pos] != 0xFFFF)
307 /* Count unused pages. */
309 while (pos < lim && pos - start < npages + 2 &&
310 minefield_admin[pos] == 0xFFFF)
312 if (pos - start == npages + 2)
314 /* If we've reached the limit, reset the limit or stop. */
316 if (lim == minefield_npages) {
317 /* go round and start again at zero */
318 lim = minefield_curpos;
321 minefield_admin_hide(1);
327 minefield_curpos = pos - 1;
330 * We have npages+2 unused pages starting at start. We leave
331 * the first and last of these alone and use the rest.
333 region_end = (start + npages + 1) * PAGESIZE;
334 region_start = region_end - size;
335 /* FIXME: could align here if we wanted */
338 * Update the admin region.
340 for (i = start + 2; i < start + npages + 1; i++)
341 minefield_admin[i] = 0xFFFE; /* used but no region starts here */
342 minefield_admin[start + 1] = region_start % PAGESIZE;
344 minefield_admin_hide(1);
346 VirtualAlloc((char *) minefield_pages + region_start, size,
347 MEM_COMMIT, PAGE_READWRITE);
348 return (char *) minefield_pages + region_start;
351 static void minefield_free(void *ptr)
353 int region_start, i, j;
355 minefield_admin_hide(0);
357 region_start = (char *) ptr - (char *) minefield_pages;
358 i = region_start / PAGESIZE;
359 if (i < 0 || i >= minefield_npages ||
360 minefield_admin[i] != region_start % PAGESIZE)
362 for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++) {
363 minefield_admin[j] = 0xFFFF;
366 VirtualFree(ptr, j * PAGESIZE - region_start, MEM_DECOMMIT);
368 minefield_admin_hide(1);
371 static int minefield_get_size(void *ptr)
373 int region_start, i, j;
375 minefield_admin_hide(0);
377 region_start = (char *) ptr - (char *) minefield_pages;
378 i = region_start / PAGESIZE;
379 if (i < 0 || i >= minefield_npages ||
380 minefield_admin[i] != region_start % PAGESIZE)
382 for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++);
384 minefield_admin_hide(1);
386 return j * PAGESIZE - region_start;
389 void *minefield_c_malloc(size_t size)
391 if (!minefield_initialised)
393 return minefield_alloc(size);
396 void minefield_c_free(void *p)
398 if (!minefield_initialised)
404 * realloc _always_ moves the chunk, for rapid detection of code
405 * that assumes it won't.
407 void *minefield_c_realloc(void *p, size_t size)
411 if (!minefield_initialised)
413 q = minefield_alloc(size);
414 oldsize = minefield_get_size(p);
415 memcpy(q, p, (oldsize < size ? oldsize : size));
420 #endif /* MINEFIELD */
422 FontSpec *fontspec_new(const char *name,
423 int bold, int height, int charset)
425 FontSpec *f = snew(FontSpec);
426 f->name = dupstr(name);
429 f->charset = charset;
432 FontSpec *fontspec_copy(const FontSpec *f)
434 return fontspec_new(f->name, f->isbold, f->height, f->charset);
436 void fontspec_free(FontSpec *f)
441 int fontspec_serialise(FontSpec *f, void *vdata)
443 char *data = (char *)vdata;
444 int len = strlen(f->name) + 1; /* include trailing NUL */
446 strcpy(data, f->name);
447 PUT_32BIT_MSB_FIRST(data + len, f->isbold);
448 PUT_32BIT_MSB_FIRST(data + len + 4, f->height);
449 PUT_32BIT_MSB_FIRST(data + len + 8, f->charset);
451 return len + 12; /* also include three 4-byte ints */
453 FontSpec *fontspec_deserialise(void *vdata, int maxsize, int *used)
455 char *data = (char *)vdata;
459 end = memchr(data, '\0', maxsize-12);
463 *used = end - data + 12;
464 return fontspec_new(data,
465 GET_32BIT_MSB_FIRST(end),
466 GET_32BIT_MSB_FIRST(end + 4),
467 GET_32BIT_MSB_FIRST(end + 8));