| 1 | /* |
| 2 | * winmisc.c: miscellaneous Windows-specific things |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include "putty.h" |
| 8 | #include <security.h> |
| 9 | |
| 10 | OSVERSIONINFO osVersion; |
| 11 | |
| 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")); |
| 15 | } |
| 16 | |
| 17 | Filename *filename_from_str(const char *str) |
| 18 | { |
| 19 | Filename *ret = snew(Filename); |
| 20 | ret->path = dupstr(str); |
| 21 | return ret; |
| 22 | } |
| 23 | |
| 24 | Filename *filename_copy(const Filename *fn) |
| 25 | { |
| 26 | return filename_from_str(fn->path); |
| 27 | } |
| 28 | |
| 29 | const char *filename_to_str(const Filename *fn) |
| 30 | { |
| 31 | return fn->path; |
| 32 | } |
| 33 | |
| 34 | int filename_equal(const Filename *f1, const Filename *f2) |
| 35 | { |
| 36 | return !strcmp(f1->path, f2->path); |
| 37 | } |
| 38 | |
| 39 | int filename_is_null(const Filename *fn) |
| 40 | { |
| 41 | return !*fn->path; |
| 42 | } |
| 43 | |
| 44 | void filename_free(Filename *fn) |
| 45 | { |
| 46 | sfree(fn->path); |
| 47 | sfree(fn); |
| 48 | } |
| 49 | |
| 50 | int filename_serialise(const Filename *f, void *vdata) |
| 51 | { |
| 52 | char *data = (char *)vdata; |
| 53 | int len = strlen(f->path) + 1; /* include trailing NUL */ |
| 54 | if (data) { |
| 55 | strcpy(data, f->path); |
| 56 | } |
| 57 | return len; |
| 58 | } |
| 59 | Filename *filename_deserialise(void *vdata, int maxsize, int *used) |
| 60 | { |
| 61 | char *data = (char *)vdata; |
| 62 | char *end; |
| 63 | end = memchr(data, '\0', maxsize); |
| 64 | if (!end) |
| 65 | return NULL; |
| 66 | end++; |
| 67 | *used = end - data; |
| 68 | return filename_from_str(data); |
| 69 | } |
| 70 | |
| 71 | #ifndef NO_SECUREZEROMEMORY |
| 72 | /* |
| 73 | * Windows implementation of smemclr (see misc.c) using SecureZeroMemory. |
| 74 | */ |
| 75 | void smemclr(void *b, size_t n) { |
| 76 | if (b && n > 0) |
| 77 | SecureZeroMemory(b, n); |
| 78 | } |
| 79 | #endif |
| 80 | |
| 81 | char *get_username(void) |
| 82 | { |
| 83 | DWORD namelen; |
| 84 | char *user; |
| 85 | int got_username = FALSE; |
| 86 | DECL_WINDOWS_FUNCTION(static, BOOLEAN, GetUserNameExA, |
| 87 | (EXTENDED_NAME_FORMAT, LPSTR, PULONG)); |
| 88 | |
| 89 | { |
| 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; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | if (p_GetUserNameExA) { |
| 100 | /* |
| 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. |
| 104 | */ |
| 105 | |
| 106 | /* Get the length */ |
| 107 | namelen = 0; |
| 108 | (void) p_GetUserNameExA(NameUserPrincipal, NULL, &namelen); |
| 109 | |
| 110 | user = snewn(namelen, char); |
| 111 | got_username = p_GetUserNameExA(NameUserPrincipal, user, &namelen); |
| 112 | if (got_username) { |
| 113 | char *p = strchr(user, '@'); |
| 114 | if (p) *p = 0; |
| 115 | } else { |
| 116 | sfree(user); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | if (!got_username) { |
| 121 | /* Fall back to local user name */ |
| 122 | namelen = 0; |
| 123 | if (GetUserName(NULL, &namelen) == FALSE) { |
| 124 | /* |
| 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 |
| 127 | * doesn't fit. |
| 128 | */ |
| 129 | namelen = 256; |
| 130 | } |
| 131 | |
| 132 | user = snewn(namelen, char); |
| 133 | got_username = GetUserName(user, &namelen); |
| 134 | if (!got_username) { |
| 135 | sfree(user); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | return got_username ? user : NULL; |
| 140 | } |
| 141 | |
| 142 | BOOL init_winver(void) |
| 143 | { |
| 144 | ZeroMemory(&osVersion, sizeof(osVersion)); |
| 145 | osVersion.dwOSVersionInfoSize = sizeof (OSVERSIONINFO); |
| 146 | return GetVersionEx ( (OSVERSIONINFO *) &osVersion); |
| 147 | } |
| 148 | |
| 149 | HMODULE load_system32_dll(const char *libname) |
| 150 | { |
| 151 | /* |
| 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 |
| 155 | * path.) |
| 156 | */ |
| 157 | static char *sysdir = NULL; |
| 158 | char *fullpath; |
| 159 | HMODULE ret; |
| 160 | |
| 161 | if (!sysdir) { |
| 162 | int size = 0, len; |
| 163 | do { |
| 164 | size = 3*size/2 + 512; |
| 165 | sysdir = sresize(sysdir, size, char); |
| 166 | len = GetSystemDirectory(sysdir, size); |
| 167 | } while (len >= size); |
| 168 | } |
| 169 | |
| 170 | fullpath = dupcat(sysdir, "\\", libname, NULL); |
| 171 | ret = LoadLibrary(fullpath); |
| 172 | sfree(fullpath); |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | #ifdef DEBUG |
| 177 | static FILE *debug_fp = NULL; |
| 178 | static HANDLE debug_hdl = INVALID_HANDLE_VALUE; |
| 179 | static int debug_got_console = 0; |
| 180 | |
| 181 | void dputs(char *buf) |
| 182 | { |
| 183 | DWORD dw; |
| 184 | |
| 185 | if (!debug_got_console) { |
| 186 | if (AllocConsole()) { |
| 187 | debug_got_console = 1; |
| 188 | debug_hdl = GetStdHandle(STD_OUTPUT_HANDLE); |
| 189 | } |
| 190 | } |
| 191 | if (!debug_fp) { |
| 192 | debug_fp = fopen("debug.log", "w"); |
| 193 | } |
| 194 | |
| 195 | if (debug_hdl != INVALID_HANDLE_VALUE) { |
| 196 | WriteFile(debug_hdl, buf, strlen(buf), &dw, NULL); |
| 197 | } |
| 198 | fputs(buf, debug_fp); |
| 199 | fflush(debug_fp); |
| 200 | } |
| 201 | #endif |
| 202 | |
| 203 | #ifdef MINEFIELD |
| 204 | /* |
| 205 | * Minefield - a Windows equivalent for Electric Fence |
| 206 | */ |
| 207 | |
| 208 | #define PAGESIZE 4096 |
| 209 | |
| 210 | /* |
| 211 | * Design: |
| 212 | * |
| 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 |
| 215 | * invalid memory. |
| 216 | * |
| 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. |
| 220 | * |
| 221 | * Freeing anything causes instantaneous decommitment of the pages |
| 222 | * involved, so stale pointers are caught as soon as possible. |
| 223 | */ |
| 224 | |
| 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; |
| 232 | |
| 233 | static void minefield_admin_hide(int hide) |
| 234 | { |
| 235 | int access = hide ? PAGE_NOACCESS : PAGE_READWRITE; |
| 236 | VirtualProtect(minefield_admin, minefield_npages * 2, access, NULL); |
| 237 | } |
| 238 | |
| 239 | static void minefield_init(void) |
| 240 | { |
| 241 | int size; |
| 242 | int admin_size; |
| 243 | int i; |
| 244 | |
| 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) |
| 249 | break; |
| 250 | } |
| 251 | minefield_size = size; |
| 252 | |
| 253 | /* |
| 254 | * Firstly, allocate a section of that to be the admin block. |
| 255 | * We'll need a two-byte field for each page. |
| 256 | */ |
| 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; |
| 262 | |
| 263 | /* |
| 264 | * Commit the admin region. |
| 265 | */ |
| 266 | VirtualAlloc(minefield_admin, minefield_npages * 2, |
| 267 | MEM_COMMIT, PAGE_READWRITE); |
| 268 | |
| 269 | /* |
| 270 | * Mark all pages as unused (0xFFFF). |
| 271 | */ |
| 272 | for (i = 0; i < minefield_npages; i++) |
| 273 | minefield_admin[i] = 0xFFFF; |
| 274 | |
| 275 | /* |
| 276 | * Hide the admin region. |
| 277 | */ |
| 278 | minefield_admin_hide(1); |
| 279 | |
| 280 | minefield_initialised = 1; |
| 281 | } |
| 282 | |
| 283 | static void minefield_bomb(void) |
| 284 | { |
| 285 | div(1, *(int *) minefield_pages); |
| 286 | } |
| 287 | |
| 288 | static void *minefield_alloc(int size) |
| 289 | { |
| 290 | int npages; |
| 291 | int pos, lim, region_end, region_start; |
| 292 | int start; |
| 293 | int i; |
| 294 | |
| 295 | npages = (size + PAGESIZE - 1) / PAGESIZE; |
| 296 | |
| 297 | minefield_admin_hide(0); |
| 298 | |
| 299 | /* |
| 300 | * Search from current position until we find a contiguous |
| 301 | * bunch of npages+2 unused pages. |
| 302 | */ |
| 303 | pos = minefield_curpos; |
| 304 | lim = minefield_npages; |
| 305 | while (1) { |
| 306 | /* Skip over used pages. */ |
| 307 | while (pos < lim && minefield_admin[pos] != 0xFFFF) |
| 308 | pos++; |
| 309 | /* Count unused pages. */ |
| 310 | start = pos; |
| 311 | while (pos < lim && pos - start < npages + 2 && |
| 312 | minefield_admin[pos] == 0xFFFF) |
| 313 | pos++; |
| 314 | if (pos - start == npages + 2) |
| 315 | break; |
| 316 | /* If we've reached the limit, reset the limit or stop. */ |
| 317 | if (pos >= lim) { |
| 318 | if (lim == minefield_npages) { |
| 319 | /* go round and start again at zero */ |
| 320 | lim = minefield_curpos; |
| 321 | pos = 0; |
| 322 | } else { |
| 323 | minefield_admin_hide(1); |
| 324 | return NULL; |
| 325 | } |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | minefield_curpos = pos - 1; |
| 330 | |
| 331 | /* |
| 332 | * We have npages+2 unused pages starting at start. We leave |
| 333 | * the first and last of these alone and use the rest. |
| 334 | */ |
| 335 | region_end = (start + npages + 1) * PAGESIZE; |
| 336 | region_start = region_end - size; |
| 337 | /* FIXME: could align here if we wanted */ |
| 338 | |
| 339 | /* |
| 340 | * Update the admin region. |
| 341 | */ |
| 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; |
| 345 | |
| 346 | minefield_admin_hide(1); |
| 347 | |
| 348 | VirtualAlloc((char *) minefield_pages + region_start, size, |
| 349 | MEM_COMMIT, PAGE_READWRITE); |
| 350 | return (char *) minefield_pages + region_start; |
| 351 | } |
| 352 | |
| 353 | static void minefield_free(void *ptr) |
| 354 | { |
| 355 | int region_start, i, j; |
| 356 | |
| 357 | minefield_admin_hide(0); |
| 358 | |
| 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) |
| 363 | minefield_bomb(); |
| 364 | for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++) { |
| 365 | minefield_admin[j] = 0xFFFF; |
| 366 | } |
| 367 | |
| 368 | VirtualFree(ptr, j * PAGESIZE - region_start, MEM_DECOMMIT); |
| 369 | |
| 370 | minefield_admin_hide(1); |
| 371 | } |
| 372 | |
| 373 | static int minefield_get_size(void *ptr) |
| 374 | { |
| 375 | int region_start, i, j; |
| 376 | |
| 377 | minefield_admin_hide(0); |
| 378 | |
| 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) |
| 383 | minefield_bomb(); |
| 384 | for (j = i; j < minefield_npages && minefield_admin[j] != 0xFFFF; j++); |
| 385 | |
| 386 | minefield_admin_hide(1); |
| 387 | |
| 388 | return j * PAGESIZE - region_start; |
| 389 | } |
| 390 | |
| 391 | void *minefield_c_malloc(size_t size) |
| 392 | { |
| 393 | if (!minefield_initialised) |
| 394 | minefield_init(); |
| 395 | return minefield_alloc(size); |
| 396 | } |
| 397 | |
| 398 | void minefield_c_free(void *p) |
| 399 | { |
| 400 | if (!minefield_initialised) |
| 401 | minefield_init(); |
| 402 | minefield_free(p); |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * realloc _always_ moves the chunk, for rapid detection of code |
| 407 | * that assumes it won't. |
| 408 | */ |
| 409 | void *minefield_c_realloc(void *p, size_t size) |
| 410 | { |
| 411 | size_t oldsize; |
| 412 | void *q; |
| 413 | if (!minefield_initialised) |
| 414 | minefield_init(); |
| 415 | q = minefield_alloc(size); |
| 416 | oldsize = minefield_get_size(p); |
| 417 | memcpy(q, p, (oldsize < size ? oldsize : size)); |
| 418 | minefield_free(p); |
| 419 | return q; |
| 420 | } |
| 421 | |
| 422 | #endif /* MINEFIELD */ |
| 423 | |
| 424 | FontSpec *fontspec_new(const char *name, |
| 425 | int bold, int height, int charset) |
| 426 | { |
| 427 | FontSpec *f = snew(FontSpec); |
| 428 | f->name = dupstr(name); |
| 429 | f->isbold = bold; |
| 430 | f->height = height; |
| 431 | f->charset = charset; |
| 432 | return f; |
| 433 | } |
| 434 | FontSpec *fontspec_copy(const FontSpec *f) |
| 435 | { |
| 436 | return fontspec_new(f->name, f->isbold, f->height, f->charset); |
| 437 | } |
| 438 | void fontspec_free(FontSpec *f) |
| 439 | { |
| 440 | sfree(f->name); |
| 441 | sfree(f); |
| 442 | } |
| 443 | int fontspec_serialise(FontSpec *f, void *vdata) |
| 444 | { |
| 445 | char *data = (char *)vdata; |
| 446 | int len = strlen(f->name) + 1; /* include trailing NUL */ |
| 447 | if (data) { |
| 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); |
| 452 | } |
| 453 | return len + 12; /* also include three 4-byte ints */ |
| 454 | } |
| 455 | FontSpec *fontspec_deserialise(void *vdata, int maxsize, int *used) |
| 456 | { |
| 457 | char *data = (char *)vdata; |
| 458 | char *end; |
| 459 | if (maxsize < 13) |
| 460 | return NULL; |
| 461 | end = memchr(data, '\0', maxsize-12); |
| 462 | if (!end) |
| 463 | return NULL; |
| 464 | end++; |
| 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)); |
| 470 | } |