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)
20 strncpy(ret.path, str, sizeof(ret.path));
21 ret.path[sizeof(ret.path)-1] = '\0';
25 const char *filename_to_str(const Filename *fn)
30 int filename_equal(Filename f1, Filename f2)
32 return !strcmp(f1.path, f2.path);
35 int filename_is_null(Filename fn)
40 char *get_username(void)
44 int got_username = FALSE;
45 DECL_WINDOWS_FUNCTION(static, BOOLEAN, GetUserNameExA,
46 (EXTENDED_NAME_FORMAT, LPSTR, PULONG));
49 static int tried_usernameex = FALSE;
50 if (!tried_usernameex) {
51 /* Not available on Win9x, so load dynamically */
52 HMODULE secur32 = load_system32_dll("secur32.dll");
53 GET_WINDOWS_FUNCTION(secur32, GetUserNameExA);
54 tried_usernameex = TRUE;
58 if (p_GetUserNameExA) {
60 * If available, use the principal -- this avoids the problem
61 * that the local username is case-insensitive but Kerberos
62 * usernames are case-sensitive.
67 (void) p_GetUserNameExA(NameUserPrincipal, NULL, &namelen);
69 user = snewn(namelen, char);
70 got_username = p_GetUserNameExA(NameUserPrincipal, user, &namelen);
72 char *p = strchr(user, '@');
80 /* Fall back to local user name */
82 if (GetUserName(NULL, &namelen) == FALSE) {
84 * Apparently this doesn't work at least on Windows XP SP2.
85 * Thus assume a maximum of 256. It will fail again if it
91 user = snewn(namelen, char);
92 got_username = GetUserName(user, &namelen);
98 return got_username ? user : NULL;
101 BOOL init_winver(void)
103 ZeroMemory(&osVersion, sizeof(osVersion));
104 osVersion.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
105 return GetVersionEx ( (OSVERSIONINFO *) &osVersion);
108 HMODULE load_system32_dll(const char *libname)
111 * Wrapper function to load a DLL out of c:\windows\system32
112 * without going through the full DLL search path. (Hence no
113 * attack is possible by placing a substitute DLL earlier on that
116 static char *sysdir = NULL;
123 size = 3*size/2 + 512;
124 sysdir = sresize(sysdir, size, char);
125 len = GetSystemDirectory(sysdir, size);
126 } while (len >= size);
129 fullpath = dupcat(sysdir, "\\", libname, NULL);
130 ret = LoadLibrary(fullpath);
136 static FILE *debug_fp = NULL;
137 static HANDLE debug_hdl = INVALID_HANDLE_VALUE;
138 static int debug_got_console = 0;
140 void dputs(char *buf)
144 if (!debug_got_console) {
145 if (AllocConsole()) {
146 debug_got_console = 1;
147 debug_hdl = GetStdHandle(STD_OUTPUT_HANDLE);
151 debug_fp = fopen("debug.log", "w");
154 if (debug_hdl != INVALID_HANDLE_VALUE) {
155 WriteFile(debug_hdl, buf, strlen(buf), &dw, NULL);
157 fputs(buf, debug_fp);
164 * Minefield - a Windows equivalent for Electric Fence
167 #define PAGESIZE 4096
172 * We start by reserving as much virtual address space as Windows
173 * will sensibly (or not sensibly) let us have. We flag it all as
176 * Any allocation attempt is satisfied by committing one or more
177 * pages, with an uncommitted page on either side. The returned
178 * memory region is jammed up against the _end_ of the pages.
180 * Freeing anything causes instantaneous decommitment of the pages
181 * involved, so stale pointers are caught as soon as possible.
184 static int minefield_initialised = 0;
185 static void *minefield_region = NULL;
186 static long minefield_size = 0;
187 static long minefield_npages = 0;
188 static long minefield_curpos = 0;
189 static unsigned short *minefield_admin = NULL;
190 static void *minefield_pages = NULL;
192 static void minefield_admin_hide(int hide)
194 int access = hide ? PAGE_NOACCESS : PAGE_READWRITE;
195 VirtualProtect(minefield_admin, minefield_npages * 2, access, NULL);
198 static void minefield_init(void)
204 for (size = 0x40000000; size > 0; size = ((size >> 3) * 7) & ~0xFFF) {
205 minefield_region = VirtualAlloc(NULL, size,
206 MEM_RESERVE, PAGE_NOACCESS);
207 if (minefield_region)
210 minefield_size = size;
213 * Firstly, allocate a section of that to be the admin block.
214 * We'll need a two-byte field for each page.
216 minefield_admin = minefield_region;
217 minefield_npages = minefield_size / PAGESIZE;
218 admin_size = (minefield_npages * 2 + PAGESIZE - 1) & ~(PAGESIZE - 1);
219 minefield_npages = (minefield_size - admin_size) / PAGESIZE;
220 minefield_pages = (char *) minefield_region + admin_size;
223 * Commit the admin region.
225 VirtualAlloc(minefield_admin, minefield_npages * 2,
226 MEM_COMMIT, PAGE_READWRITE);
229 * Mark all pages as unused (0xFFFF).
231 for (i = 0; i < minefield_npages; i++)
232 minefield_admin[i] = 0xFFFF;
235 * Hide the admin region.
237 minefield_admin_hide(1);
239 minefield_initialised = 1;
242 static void minefield_bomb(void)
244 div(1, *(int *) minefield_pages);
247 static void *minefield_alloc(int size)
250 int pos, lim, region_end, region_start;
254 npages = (size + PAGESIZE - 1) / PAGESIZE;
256 minefield_admin_hide(0);
259 * Search from current position until we find a contiguous
260 * bunch of npages+2 unused pages.
262 pos = minefield_curpos;
263 lim = minefield_npages;
265 /* Skip over used pages. */
266 while (pos < lim && minefield_admin[pos] != 0xFFFF)
268 /* Count unused pages. */
270 while (pos < lim && pos - start < npages + 2 &&
271 minefield_admin[pos] == 0xFFFF)
273 if (pos - start == npages + 2)
275 /* If we've reached the limit, reset the limit or stop. */
277 if (lim == minefield_npages) {
278 /* go round and start again at zero */
279 lim = minefield_curpos;
282 minefield_admin_hide(1);
288 minefield_curpos = pos - 1;
291 * We have npages+2 unused pages starting at start. We leave
292 * the first and last of these alone and use the rest.
294 region_end = (start + npages + 1) * PAGESIZE;
295 region_start = region_end - size;
296 /* FIXME: could align here if we wanted */
299 * Update the admin region.
301 for (i = start + 2; i < start + npages + 1; i++)
302 minefield_admin[i] = 0xFFFE; /* used but no region starts here */
303 minefield_admin[start + 1] = region_start % PAGESIZE;
305 minefield_admin_hide(1);
307 VirtualAlloc((char *) minefield_pages + region_start, size,
308 MEM_COMMIT, PAGE_READWRITE);
309 return (char *) minefield_pages + region_start;
312 static void minefield_free(void *ptr)
314 int region_start, i, j;
316 minefield_admin_hide(0);
318 region_start = (char *) ptr - (char *) minefield_pages;
319 i = region_start / PAGESIZE;
320 if (i < 0 || i >= minefield_npages ||
321 minefield_admin[i] != region_start % PAGESIZE)
323 for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++) {
324 minefield_admin[j] = 0xFFFF;
327 VirtualFree(ptr, j * PAGESIZE - region_start, MEM_DECOMMIT);
329 minefield_admin_hide(1);
332 static int minefield_get_size(void *ptr)
334 int region_start, i, j;
336 minefield_admin_hide(0);
338 region_start = (char *) ptr - (char *) minefield_pages;
339 i = region_start / PAGESIZE;
340 if (i < 0 || i >= minefield_npages ||
341 minefield_admin[i] != region_start % PAGESIZE)
343 for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++);
345 minefield_admin_hide(1);
347 return j * PAGESIZE - region_start;
350 void *minefield_c_malloc(size_t size)
352 if (!minefield_initialised)
354 return minefield_alloc(size);
357 void minefield_c_free(void *p)
359 if (!minefield_initialised)
365 * realloc _always_ moves the chunk, for rapid detection of code
366 * that assumes it won't.
368 void *minefield_c_realloc(void *p, size_t size)
372 if (!minefield_initialised)
374 q = minefield_alloc(size);
375 oldsize = minefield_get_size(p);
376 memcpy(q, p, (oldsize < size ? oldsize : size));
381 #endif /* MINEFIELD */