Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ |
| 2 | /* dbus-break-loader.c Program to find byte streams that break the message loader |
| 3 | * |
| 4 | * Copyright (C) 2003 Red Hat Inc. |
| 5 | * |
| 6 | * Licensed under the Academic Free License version 2.1 |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include <dbus/dbus.h> |
| 26 | #include <sys/stat.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <fcntl.h> |
| 29 | #include <stdio.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <unistd.h> |
| 32 | #include <errno.h> |
| 33 | #include <sys/wait.h> |
| 34 | #include <string.h> |
| 35 | |
| 36 | #define DBUS_COMPILATION |
| 37 | #include <dbus/dbus-string.h> |
| 38 | #include <dbus/dbus-internals.h> |
| 39 | #include <dbus/dbus-test.h> |
| 40 | #include <dbus/dbus-marshal-basic.h> |
| 41 | #undef DBUS_COMPILATION |
| 42 | |
| 43 | static DBusString failure_dir; |
| 44 | static int total_attempts; |
| 45 | static int failures_this_iteration; |
| 46 | |
| 47 | static int |
| 48 | random_int_in_range (int start, |
| 49 | int end) |
| 50 | { |
| 51 | /* such elegant math */ |
| 52 | double gap; |
| 53 | double v_double; |
| 54 | int v; |
| 55 | |
| 56 | if (start == end) |
| 57 | return start; |
| 58 | |
| 59 | _dbus_assert (end > start); |
| 60 | |
| 61 | gap = end - start - 1; /* -1 to not include "end" */ |
| 62 | v_double = ((double)start) + (((double)rand ())/RAND_MAX) * gap; |
| 63 | if (v_double < 0.0) |
| 64 | v = (v_double - 0.5); |
| 65 | else |
| 66 | v = (v_double + 0.5); |
| 67 | |
| 68 | if (v < start) |
| 69 | { |
| 70 | fprintf (stderr, "random_int_in_range() generated %d for range [%d,%d)\n", |
| 71 | v, start, end); |
| 72 | v = start; |
| 73 | } |
| 74 | else if (v >= end) |
| 75 | { |
| 76 | fprintf (stderr, "random_int_in_range() generated %d for range [%d,%d)\n", |
| 77 | v, start, end); |
| 78 | v = end - 1; |
| 79 | } |
| 80 | |
| 81 | /* printf (" %d of [%d,%d)\n", v, start, end); */ |
| 82 | |
| 83 | return v; |
| 84 | } |
| 85 | |
| 86 | static dbus_bool_t |
| 87 | try_mutated_data (const DBusString *data) |
| 88 | { |
| 89 | int pid; |
| 90 | |
| 91 | total_attempts += 1; |
| 92 | /* printf (" attempt %d\n", total_attempts); */ |
| 93 | |
| 94 | pid = fork (); |
| 95 | |
| 96 | if (pid < 0) |
| 97 | { |
| 98 | fprintf (stderr, "fork() failed: %s\n", |
| 99 | strerror (errno)); |
| 100 | exit (1); |
| 101 | return FALSE; |
| 102 | } |
| 103 | |
| 104 | if (pid == 0) |
| 105 | { |
| 106 | /* Child, try loading the data */ |
| 107 | if (!dbus_internal_do_not_use_try_message_data (data, _DBUS_MESSAGE_UNKNOWN)) |
| 108 | exit (1); |
| 109 | else |
| 110 | exit (0); |
| 111 | } |
| 112 | else |
| 113 | { |
| 114 | /* Parent, wait for child */ |
| 115 | int status; |
| 116 | DBusString filename; |
| 117 | dbus_bool_t failed; |
| 118 | |
| 119 | if (waitpid (pid, &status, 0) < 0) |
| 120 | { |
| 121 | fprintf (stderr, "waitpid() failed: %s\n", strerror (errno)); |
| 122 | exit (1); |
| 123 | return FALSE; |
| 124 | } |
| 125 | |
| 126 | failed = FALSE; |
| 127 | |
| 128 | if (!_dbus_string_init (&filename) || |
| 129 | !_dbus_string_copy (&failure_dir, 0, |
| 130 | &filename, 0) || |
| 131 | !_dbus_string_append_byte (&filename, '/')) |
| 132 | { |
| 133 | fprintf (stderr, "out of memory\n"); |
| 134 | exit (1); |
| 135 | } |
| 136 | |
| 137 | _dbus_string_append_int (&filename, total_attempts); |
| 138 | |
| 139 | if (WIFEXITED (status)) |
| 140 | { |
| 141 | if (WEXITSTATUS (status) != 0) |
| 142 | { |
| 143 | _dbus_string_append (&filename, "-exited-"); |
| 144 | _dbus_string_append_int (&filename, WEXITSTATUS (status)); |
| 145 | failed = TRUE; |
| 146 | } |
| 147 | } |
| 148 | else if (WIFSIGNALED (status)) |
| 149 | { |
| 150 | _dbus_string_append (&filename, "signaled-"); |
| 151 | _dbus_string_append_int (&filename, WTERMSIG (status)); |
| 152 | failed = TRUE; |
| 153 | } |
| 154 | |
| 155 | if (failed) |
| 156 | { |
| 157 | DBusError error; |
| 158 | |
| 159 | _dbus_string_append (&filename, ".message-raw"); |
| 160 | |
| 161 | printf ("Child failed, writing %s\n", _dbus_string_get_const_data (&filename)); |
| 162 | |
| 163 | dbus_error_init (&error); |
| 164 | if (!_dbus_string_save_to_file (data, &filename, FALSE, &error)) |
| 165 | { |
| 166 | fprintf (stderr, "Failed to save failed message data: %s\n", |
| 167 | error.message); |
| 168 | dbus_error_free (&error); |
| 169 | exit (1); /* so we can see the seed that was printed out */ |
| 170 | } |
| 171 | |
| 172 | failures_this_iteration += 1; |
| 173 | |
| 174 | _dbus_string_free (&filename); |
| 175 | |
| 176 | return FALSE; |
| 177 | } |
| 178 | else |
| 179 | { |
| 180 | _dbus_string_free (&filename); |
| 181 | return TRUE; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | _dbus_assert_not_reached ("should not be reached"); |
| 186 | return TRUE; |
| 187 | } |
| 188 | |
| 189 | static void |
| 190 | randomly_shorten_or_lengthen (const DBusString *orig_data, |
| 191 | DBusString *mutated) |
| 192 | { |
| 193 | int delta; |
| 194 | |
| 195 | if (orig_data != mutated) |
| 196 | { |
| 197 | _dbus_string_set_length (mutated, 0); |
| 198 | |
| 199 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 200 | _dbus_assert_not_reached ("out of mem"); |
| 201 | } |
| 202 | |
| 203 | if (_dbus_string_get_length (mutated) == 0) |
| 204 | delta = random_int_in_range (0, 10); |
| 205 | else |
| 206 | delta = random_int_in_range (- _dbus_string_get_length (mutated), |
| 207 | _dbus_string_get_length (mutated) * 3); |
| 208 | |
| 209 | if (delta < 0) |
| 210 | _dbus_string_shorten (mutated, - delta); |
| 211 | else if (delta > 0) |
| 212 | { |
| 213 | int i = 0; |
| 214 | |
| 215 | i = _dbus_string_get_length (mutated); |
| 216 | if (!_dbus_string_lengthen (mutated, delta)) |
| 217 | _dbus_assert_not_reached ("couldn't lengthen string"); |
| 218 | |
| 219 | while (i < _dbus_string_get_length (mutated)) |
| 220 | { |
| 221 | _dbus_string_set_byte (mutated, |
| 222 | i, |
| 223 | random_int_in_range (0, 256)); |
| 224 | ++i; |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | static void |
| 230 | randomly_change_one_byte (const DBusString *orig_data, |
| 231 | DBusString *mutated) |
| 232 | { |
| 233 | int i; |
| 234 | |
| 235 | if (orig_data != mutated) |
| 236 | { |
| 237 | _dbus_string_set_length (mutated, 0); |
| 238 | |
| 239 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 240 | _dbus_assert_not_reached ("out of mem"); |
| 241 | } |
| 242 | |
| 243 | if (_dbus_string_get_length (mutated) == 0) |
| 244 | return; |
| 245 | |
| 246 | i = random_int_in_range (0, _dbus_string_get_length (mutated)); |
| 247 | |
| 248 | _dbus_string_set_byte (mutated, i, |
| 249 | random_int_in_range (0, 256)); |
| 250 | } |
| 251 | |
| 252 | static void |
| 253 | randomly_remove_one_byte (const DBusString *orig_data, |
| 254 | DBusString *mutated) |
| 255 | { |
| 256 | int i; |
| 257 | |
| 258 | if (orig_data != mutated) |
| 259 | { |
| 260 | _dbus_string_set_length (mutated, 0); |
| 261 | |
| 262 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 263 | _dbus_assert_not_reached ("out of mem"); |
| 264 | } |
| 265 | |
| 266 | if (_dbus_string_get_length (mutated) == 0) |
| 267 | return; |
| 268 | |
| 269 | i = random_int_in_range (0, _dbus_string_get_length (mutated)); |
| 270 | |
| 271 | _dbus_string_delete (mutated, i, 1); |
| 272 | } |
| 273 | |
| 274 | |
| 275 | static void |
| 276 | randomly_add_one_byte (const DBusString *orig_data, |
| 277 | DBusString *mutated) |
| 278 | { |
| 279 | int i; |
| 280 | |
| 281 | if (orig_data != mutated) |
| 282 | { |
| 283 | _dbus_string_set_length (mutated, 0); |
| 284 | |
| 285 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 286 | _dbus_assert_not_reached ("out of mem"); |
| 287 | } |
| 288 | |
| 289 | i = random_int_in_range (0, _dbus_string_get_length (mutated)); |
| 290 | |
| 291 | _dbus_string_insert_bytes (mutated, i, 1, |
| 292 | random_int_in_range (0, 256)); |
| 293 | } |
| 294 | |
| 295 | static void |
| 296 | randomly_modify_length (const DBusString *orig_data, |
| 297 | DBusString *mutated) |
| 298 | { |
| 299 | int i; |
| 300 | int byte_order; |
| 301 | const char *d; |
| 302 | dbus_uint32_t orig; |
| 303 | int delta; |
| 304 | |
| 305 | if (orig_data != mutated) |
| 306 | { |
| 307 | _dbus_string_set_length (mutated, 0); |
| 308 | |
| 309 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 310 | _dbus_assert_not_reached ("out of mem"); |
| 311 | } |
| 312 | |
| 313 | if (_dbus_string_get_length (mutated) < 12) |
| 314 | return; |
| 315 | |
| 316 | d = _dbus_string_get_const_data (mutated); |
| 317 | |
| 318 | if (!(*d == DBUS_LITTLE_ENDIAN || |
| 319 | *d == DBUS_BIG_ENDIAN)) |
| 320 | return; |
| 321 | |
| 322 | byte_order = *d; |
| 323 | |
| 324 | i = random_int_in_range (4, _dbus_string_get_length (mutated) - 8); |
| 325 | i = _DBUS_ALIGN_VALUE (i, 4); |
| 326 | |
| 327 | orig = _dbus_demarshal_uint32 (mutated, byte_order, i, NULL); |
| 328 | |
| 329 | delta = random_int_in_range (-10, 10); |
| 330 | |
| 331 | _dbus_marshal_set_uint32 (mutated, byte_order, i, |
| 332 | (unsigned) (orig + delta)); |
| 333 | } |
| 334 | |
| 335 | static void |
| 336 | randomly_set_extreme_ints (const DBusString *orig_data, |
| 337 | DBusString *mutated) |
| 338 | { |
| 339 | int i; |
| 340 | int byte_order; |
| 341 | const char *d; |
| 342 | dbus_uint32_t orig; |
| 343 | static int which = 0; |
| 344 | unsigned int extreme_ints[] = { |
| 345 | _DBUS_INT_MAX, |
| 346 | _DBUS_UINT_MAX, |
| 347 | _DBUS_INT_MAX - 1, |
| 348 | _DBUS_UINT_MAX - 1, |
| 349 | _DBUS_INT_MAX - 2, |
| 350 | _DBUS_UINT_MAX - 2, |
| 351 | _DBUS_INT_MAX - 17, |
| 352 | _DBUS_UINT_MAX - 17, |
| 353 | _DBUS_INT_MAX / 2, |
| 354 | _DBUS_INT_MAX / 3, |
| 355 | _DBUS_UINT_MAX / 2, |
| 356 | _DBUS_UINT_MAX / 3, |
| 357 | 0, 1, 2, 3, |
| 358 | (unsigned int) -1, |
| 359 | (unsigned int) -2, |
| 360 | (unsigned int) -3 |
| 361 | }; |
| 362 | |
| 363 | if (orig_data != mutated) |
| 364 | { |
| 365 | _dbus_string_set_length (mutated, 0); |
| 366 | |
| 367 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 368 | _dbus_assert_not_reached ("out of mem"); |
| 369 | } |
| 370 | |
| 371 | if (_dbus_string_get_length (mutated) < 12) |
| 372 | return; |
| 373 | |
| 374 | d = _dbus_string_get_const_data (mutated); |
| 375 | |
| 376 | if (!(*d == DBUS_LITTLE_ENDIAN || |
| 377 | *d == DBUS_BIG_ENDIAN)) |
| 378 | return; |
| 379 | |
| 380 | byte_order = *d; |
| 381 | |
| 382 | i = random_int_in_range (4, _dbus_string_get_length (mutated) - 8); |
| 383 | i = _DBUS_ALIGN_VALUE (i, 4); |
| 384 | |
| 385 | orig = _dbus_demarshal_uint32 (mutated, byte_order, i, NULL); |
| 386 | |
| 387 | which = random_int_in_range (0, _DBUS_N_ELEMENTS (extreme_ints)); |
| 388 | |
| 389 | _dbus_assert (which >= 0); |
| 390 | _dbus_assert (which < _DBUS_N_ELEMENTS (extreme_ints)); |
| 391 | |
| 392 | _dbus_marshal_set_uint32 (mutated, byte_order, i, |
| 393 | extreme_ints[which]); |
| 394 | } |
| 395 | |
| 396 | static int |
| 397 | random_type (void) |
| 398 | { |
| 399 | const char types[] = { |
| 400 | DBUS_TYPE_INVALID, |
| 401 | DBUS_TYPE_NIL, |
| 402 | DBUS_TYPE_BYTE, |
| 403 | DBUS_TYPE_BOOLEAN, |
| 404 | DBUS_TYPE_INT32, |
| 405 | DBUS_TYPE_UINT32, |
| 406 | DBUS_TYPE_INT64, |
| 407 | DBUS_TYPE_UINT64, |
| 408 | DBUS_TYPE_DOUBLE, |
| 409 | DBUS_TYPE_STRING, |
| 410 | DBUS_TYPE_CUSTOM, |
| 411 | DBUS_TYPE_ARRAY, |
| 412 | DBUS_TYPE_DICT, |
| 413 | DBUS_TYPE_OBJECT_PATH |
| 414 | }; |
| 415 | |
| 416 | _dbus_assert (_DBUS_N_ELEMENTS (types) == DBUS_NUMBER_OF_TYPES + 1); |
| 417 | |
| 418 | return types[ random_int_in_range (0, _DBUS_N_ELEMENTS (types)) ]; |
| 419 | } |
| 420 | |
| 421 | static void |
| 422 | randomly_change_one_type (const DBusString *orig_data, |
| 423 | DBusString *mutated) |
| 424 | { |
| 425 | int i; |
| 426 | int len; |
| 427 | |
| 428 | if (orig_data != mutated) |
| 429 | { |
| 430 | _dbus_string_set_length (mutated, 0); |
| 431 | |
| 432 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 433 | _dbus_assert_not_reached ("out of mem"); |
| 434 | } |
| 435 | |
| 436 | if (_dbus_string_get_length (mutated) == 0) |
| 437 | return; |
| 438 | |
| 439 | len = _dbus_string_get_length (mutated); |
| 440 | i = random_int_in_range (0, len); |
| 441 | |
| 442 | /* Look for a type starting at a random location, |
| 443 | * and replace with a different type |
| 444 | */ |
| 445 | while (i < len) |
| 446 | { |
| 447 | int b; |
| 448 | b = _dbus_string_get_byte (mutated, i); |
| 449 | if (_dbus_type_is_valid (b)) |
| 450 | { |
| 451 | _dbus_string_set_byte (mutated, i, random_type ()); |
| 452 | return; |
| 453 | } |
| 454 | ++i; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | static int times_we_did_each_thing[7] = { 0, }; |
| 459 | |
| 460 | static void |
| 461 | randomly_do_n_things (const DBusString *orig_data, |
| 462 | DBusString *mutated, |
| 463 | int n) |
| 464 | { |
| 465 | int i; |
| 466 | void (* functions[]) (const DBusString *orig_data, |
| 467 | DBusString *mutated) = |
| 468 | { |
| 469 | randomly_shorten_or_lengthen, |
| 470 | randomly_change_one_byte, |
| 471 | randomly_add_one_byte, |
| 472 | randomly_remove_one_byte, |
| 473 | randomly_modify_length, |
| 474 | randomly_set_extreme_ints, |
| 475 | randomly_change_one_type |
| 476 | }; |
| 477 | |
| 478 | _dbus_string_set_length (mutated, 0); |
| 479 | |
| 480 | if (!_dbus_string_copy (orig_data, 0, mutated, 0)) |
| 481 | _dbus_assert_not_reached ("out of mem"); |
| 482 | |
| 483 | i = 0; |
| 484 | while (i < n) |
| 485 | { |
| 486 | int which; |
| 487 | |
| 488 | which = random_int_in_range (0, _DBUS_N_ELEMENTS (functions)); |
| 489 | |
| 490 | (* functions[which]) (mutated, mutated); |
| 491 | times_we_did_each_thing[which] += 1; |
| 492 | |
| 493 | ++i; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | static dbus_bool_t |
| 498 | find_breaks_based_on (const DBusString *filename, |
| 499 | dbus_bool_t is_raw, |
| 500 | DBusMessageValidity expected_validity, |
| 501 | void *data) |
| 502 | { |
| 503 | DBusString orig_data; |
| 504 | DBusString mutated; |
| 505 | const char *filename_c; |
| 506 | dbus_bool_t retval; |
| 507 | int i; |
| 508 | |
| 509 | filename_c = _dbus_string_get_const_data (filename); |
| 510 | |
| 511 | retval = FALSE; |
| 512 | |
| 513 | if (!_dbus_string_init (&orig_data)) |
| 514 | _dbus_assert_not_reached ("could not allocate string\n"); |
| 515 | |
| 516 | if (!_dbus_string_init (&mutated)) |
| 517 | _dbus_assert_not_reached ("could not allocate string\n"); |
| 518 | |
| 519 | if (!dbus_internal_do_not_use_load_message_file (filename, is_raw, |
| 520 | &orig_data)) |
| 521 | { |
| 522 | fprintf (stderr, "could not load file %s\n", filename_c); |
| 523 | goto failed; |
| 524 | } |
| 525 | |
| 526 | printf (" changing one random byte 100 times\n"); |
| 527 | i = 0; |
| 528 | while (i < 100) |
| 529 | { |
| 530 | randomly_change_one_byte (&orig_data, &mutated); |
| 531 | try_mutated_data (&mutated); |
| 532 | |
| 533 | ++i; |
| 534 | } |
| 535 | |
| 536 | printf (" changing length 50 times\n"); |
| 537 | i = 0; |
| 538 | while (i < 50) |
| 539 | { |
| 540 | randomly_modify_length (&orig_data, &mutated); |
| 541 | try_mutated_data (&mutated); |
| 542 | |
| 543 | ++i; |
| 544 | } |
| 545 | |
| 546 | printf (" removing one byte 50 times\n"); |
| 547 | i = 0; |
| 548 | while (i < 50) |
| 549 | { |
| 550 | randomly_remove_one_byte (&orig_data, &mutated); |
| 551 | try_mutated_data (&mutated); |
| 552 | |
| 553 | ++i; |
| 554 | } |
| 555 | |
| 556 | printf (" adding one byte 50 times\n"); |
| 557 | i = 0; |
| 558 | while (i < 50) |
| 559 | { |
| 560 | randomly_add_one_byte (&orig_data, &mutated); |
| 561 | try_mutated_data (&mutated); |
| 562 | |
| 563 | ++i; |
| 564 | } |
| 565 | |
| 566 | printf (" changing ints to boundary values 50 times\n"); |
| 567 | i = 0; |
| 568 | while (i < 50) |
| 569 | { |
| 570 | randomly_set_extreme_ints (&orig_data, &mutated); |
| 571 | try_mutated_data (&mutated); |
| 572 | |
| 573 | ++i; |
| 574 | } |
| 575 | |
| 576 | printf (" changing typecodes 50 times\n"); |
| 577 | i = 0; |
| 578 | while (i < 50) |
| 579 | { |
| 580 | randomly_change_one_type (&orig_data, &mutated); |
| 581 | try_mutated_data (&mutated); |
| 582 | |
| 583 | ++i; |
| 584 | } |
| 585 | |
| 586 | printf (" changing message length 15 times\n"); |
| 587 | i = 0; |
| 588 | while (i < 15) |
| 589 | { |
| 590 | randomly_shorten_or_lengthen (&orig_data, &mutated); |
| 591 | try_mutated_data (&mutated); |
| 592 | |
| 593 | ++i; |
| 594 | } |
| 595 | |
| 596 | printf (" randomly making 2 of above modifications 42 times\n"); |
| 597 | i = 0; |
| 598 | while (i < 42) |
| 599 | { |
| 600 | randomly_do_n_things (&orig_data, &mutated, 2); |
| 601 | try_mutated_data (&mutated); |
| 602 | |
| 603 | ++i; |
| 604 | } |
| 605 | |
| 606 | printf (" randomly making 3 of above modifications 42 times\n"); |
| 607 | i = 0; |
| 608 | while (i < 42) |
| 609 | { |
| 610 | randomly_do_n_things (&orig_data, &mutated, 3); |
| 611 | try_mutated_data (&mutated); |
| 612 | |
| 613 | ++i; |
| 614 | } |
| 615 | |
| 616 | printf (" randomly making 4 of above modifications 42 times\n"); |
| 617 | i = 0; |
| 618 | while (i < 42) |
| 619 | { |
| 620 | randomly_do_n_things (&orig_data, &mutated, 4); |
| 621 | try_mutated_data (&mutated); |
| 622 | |
| 623 | ++i; |
| 624 | } |
| 625 | |
| 626 | retval = TRUE; |
| 627 | |
| 628 | failed: |
| 629 | |
| 630 | _dbus_string_free (&orig_data); |
| 631 | _dbus_string_free (&mutated); |
| 632 | |
| 633 | /* FALSE means end the whole process */ |
| 634 | return retval; |
| 635 | } |
| 636 | |
| 637 | static unsigned int |
| 638 | get_random_seed (void) |
| 639 | { |
| 640 | DBusString bytes; |
| 641 | unsigned int seed; |
| 642 | int fd; |
| 643 | const char *s; |
| 644 | |
| 645 | seed = 0; |
| 646 | |
| 647 | if (!_dbus_string_init (&bytes)) |
| 648 | exit (1); |
| 649 | |
| 650 | fd = open ("/dev/urandom", O_RDONLY); |
| 651 | if (fd < 0) |
| 652 | goto use_fallback; |
| 653 | |
| 654 | if (_dbus_read (fd, &bytes, 4) != 4) |
| 655 | goto use_fallback; |
| 656 | |
| 657 | close (fd); |
| 658 | |
| 659 | s = _dbus_string_get_const_data (&bytes); |
| 660 | |
| 661 | seed = * (unsigned int*) s; |
| 662 | goto out; |
| 663 | |
| 664 | use_fallback: |
| 665 | { |
| 666 | long tv_usec; |
| 667 | |
| 668 | fprintf (stderr, "could not open/read /dev/urandom, using current time for seed\n"); |
| 669 | |
| 670 | _dbus_get_current_time (NULL, &tv_usec); |
| 671 | |
| 672 | seed = tv_usec; |
| 673 | } |
| 674 | |
| 675 | out: |
| 676 | _dbus_string_free (&bytes); |
| 677 | |
| 678 | return seed; |
| 679 | } |
| 680 | |
| 681 | int |
| 682 | main (int argc, |
| 683 | char **argv) |
| 684 | { |
| 685 | const char *test_data_dir; |
| 686 | const char *failure_dir_c; |
| 687 | int total_failures_found; |
| 688 | |
| 689 | if (argc > 1) |
| 690 | test_data_dir = argv[1]; |
| 691 | else |
| 692 | { |
| 693 | fprintf (stderr, "Must specify a top_srcdir/test/data directory\n"); |
| 694 | return 1; |
| 695 | } |
| 696 | |
| 697 | total_failures_found = 0; |
| 698 | total_attempts = 0; |
| 699 | |
| 700 | if (!_dbus_string_init (&failure_dir)) |
| 701 | return 1; |
| 702 | |
| 703 | /* so you can leave it overnight safely */ |
| 704 | #define MAX_FAILURES 1000 |
| 705 | |
| 706 | while (total_failures_found < MAX_FAILURES) |
| 707 | { |
| 708 | unsigned int seed; |
| 709 | |
| 710 | failures_this_iteration = 0; |
| 711 | |
| 712 | seed = get_random_seed (); |
| 713 | |
| 714 | _dbus_string_set_length (&failure_dir, 0); |
| 715 | |
| 716 | if (!_dbus_string_append (&failure_dir, "failures-")) |
| 717 | return 1; |
| 718 | |
| 719 | if (!_dbus_string_append_uint (&failure_dir, seed)) |
| 720 | return 1; |
| 721 | |
| 722 | failure_dir_c = _dbus_string_get_const_data (&failure_dir); |
| 723 | |
| 724 | if (mkdir (failure_dir_c, 0700) < 0) |
| 725 | { |
| 726 | if (errno != EEXIST) |
| 727 | fprintf (stderr, "didn't mkdir %s: %s\n", |
| 728 | failure_dir_c, strerror (errno)); |
| 729 | } |
| 730 | |
| 731 | printf ("next seed = %u \ttotal failures %d of %d attempts\n", |
| 732 | seed, total_failures_found, total_attempts); |
| 733 | |
| 734 | srand (seed); |
| 735 | |
| 736 | if (!dbus_internal_do_not_use_foreach_message_file (test_data_dir, |
| 737 | find_breaks_based_on, |
| 738 | NULL)) |
| 739 | { |
| 740 | fprintf (stderr, "fatal error iterating over message files\n"); |
| 741 | rmdir (failure_dir_c); |
| 742 | return 1; |
| 743 | } |
| 744 | |
| 745 | printf (" did %d random mutations: %d %d %d %d %d %d %d\n", |
| 746 | _DBUS_N_ELEMENTS (times_we_did_each_thing), |
| 747 | times_we_did_each_thing[0], |
| 748 | times_we_did_each_thing[1], |
| 749 | times_we_did_each_thing[2], |
| 750 | times_we_did_each_thing[3], |
| 751 | times_we_did_each_thing[4], |
| 752 | times_we_did_each_thing[5], |
| 753 | times_we_did_each_thing[6]); |
| 754 | |
| 755 | printf ("Found %d failures with seed %u stored in %s\n", |
| 756 | failures_this_iteration, seed, failure_dir_c); |
| 757 | |
| 758 | total_failures_found += failures_this_iteration; |
| 759 | |
| 760 | rmdir (failure_dir_c); /* does nothing if non-empty */ |
| 761 | } |
| 762 | |
| 763 | return 0; |
| 764 | } |