1 /* 2 * OS specific functions for UNIX/POSIX systems 3 * Copyright (c) 2005-2009, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include <time.h> 12 #include <sys/wait.h> 13 14 #ifdef ANDROID 15 #include <sys/capability.h> 16 #include <sys/prctl.h> 17 #include <private/android_filesystem_config.h> 18 #endif /* ANDROID */ 19 20 #include "os.h" 21 #include "common.h" 22 23 #ifdef WPA_TRACE 24 25 #include "wpa_debug.h" 26 #include "trace.h" 27 #include "list.h" 28 29 static struct dl_list alloc_list = DL_LIST_HEAD_INIT(alloc_list); 30 31 #define ALLOC_MAGIC 0xa84ef1b2 32 #define FREED_MAGIC 0x67fd487a 33 34 struct os_alloc_trace { 35 unsigned int magic; 36 struct dl_list list; 37 size_t len; 38 WPA_TRACE_INFO 39 }; 40 41 #endif /* WPA_TRACE */ 42 43 44 void os_sleep(os_time_t sec, os_time_t usec) 45 { 46 if (sec) 47 sleep(sec); 48 if (usec) 49 usleep(usec); 50 } 51 52 53 int os_get_time(struct os_time *t) 54 { 55 int res; 56 struct timeval tv; 57 res = gettimeofday(&tv, NULL); 58 t->sec = tv.tv_sec; 59 t->usec = tv.tv_usec; 60 return res; 61 } 62 63 64 int os_get_reltime(struct os_reltime *t) 65 { 66 #if defined(CLOCK_BOOTTIME) 67 static clockid_t clock_id = CLOCK_BOOTTIME; 68 #elif defined(CLOCK_MONOTONIC) 69 static clockid_t clock_id = CLOCK_MONOTONIC; 70 #else 71 static clockid_t clock_id = CLOCK_REALTIME; 72 #endif 73 struct timespec ts; 74 int res; 75 76 while (1) { 77 res = clock_gettime(clock_id, &ts); 78 if (res == 0) { 79 t->sec = ts.tv_sec; 80 t->usec = ts.tv_nsec / 1000; 81 return 0; 82 } 83 switch (clock_id) { 84 #ifdef CLOCK_BOOTTIME 85 case CLOCK_BOOTTIME: 86 clock_id = CLOCK_MONOTONIC; 87 break; 88 #endif 89 #ifdef CLOCK_MONOTONIC 90 case CLOCK_MONOTONIC: 91 clock_id = CLOCK_REALTIME; 92 break; 93 #endif 94 case CLOCK_REALTIME: 95 return -1; 96 } 97 } 98 } 99 100 101 int os_mktime(int year, int month, int day, int hour, int min, int sec, 102 os_time_t *t) 103 { 104 struct tm tm, *tm1; 105 time_t t_local, t1, t2; 106 os_time_t tz_offset; 107 108 if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 || 109 hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 || 110 sec > 60) 111 return -1; 112 113 memset(&tm, 0, sizeof(tm)); 114 tm.tm_year = year - 1900; 115 tm.tm_mon = month - 1; 116 tm.tm_mday = day; 117 tm.tm_hour = hour; 118 tm.tm_min = min; 119 tm.tm_sec = sec; 120 121 t_local = mktime(&tm); 122 123 /* figure out offset to UTC */ 124 tm1 = localtime(&t_local); 125 if (tm1) { 126 t1 = mktime(tm1); 127 tm1 = gmtime(&t_local); 128 if (tm1) { 129 t2 = mktime(tm1); 130 tz_offset = t2 - t1; 131 } else 132 tz_offset = 0; 133 } else 134 tz_offset = 0; 135 136 *t = (os_time_t) t_local - tz_offset; 137 return 0; 138 } 139 140 141 int os_gmtime(os_time_t t, struct os_tm *tm) 142 { 143 struct tm *tm2; 144 time_t t2 = t; 145 146 tm2 = gmtime(&t2); 147 if (tm2 == NULL) 148 return -1; 149 tm->sec = tm2->tm_sec; 150 tm->min = tm2->tm_min; 151 tm->hour = tm2->tm_hour; 152 tm->day = tm2->tm_mday; 153 tm->month = tm2->tm_mon + 1; 154 tm->year = tm2->tm_year + 1900; 155 return 0; 156 } 157 158 159 #ifdef __APPLE__ 160 #include <fcntl.h> 161 static int os_daemon(int nochdir, int noclose) 162 { 163 int devnull; 164 165 if (chdir("/") < 0) 166 return -1; 167 168 devnull = open("/dev/null", O_RDWR); 169 if (devnull < 0) 170 return -1; 171 172 if (dup2(devnull, STDIN_FILENO) < 0) { 173 close(devnull); 174 return -1; 175 } 176 177 if (dup2(devnull, STDOUT_FILENO) < 0) { 178 close(devnull); 179 return -1; 180 } 181 182 if (dup2(devnull, STDERR_FILENO) < 0) { 183 close(devnull); 184 return -1; 185 } 186 187 return 0; 188 } 189 #else /* __APPLE__ */ 190 #define os_daemon daemon 191 #endif /* __APPLE__ */ 192 193 194 int os_daemonize(const char *pid_file) 195 { 196 #if defined(__uClinux__) || defined(__sun__) 197 return -1; 198 #else /* defined(__uClinux__) || defined(__sun__) */ 199 if (os_daemon(0, 0)) { 200 perror("daemon"); 201 return -1; 202 } 203 204 if (pid_file) { 205 FILE *f = fopen(pid_file, "w"); 206 if (f) { 207 fprintf(f, "%u\n", getpid()); 208 fclose(f); 209 } 210 } 211 212 return -0; 213 #endif /* defined(__uClinux__) || defined(__sun__) */ 214 } 215 216 217 void os_daemonize_terminate(const char *pid_file) 218 { 219 if (pid_file) 220 unlink(pid_file); 221 } 222 223 224 int os_get_random(unsigned char *buf, size_t len) 225 { 226 FILE *f; 227 size_t rc; 228 229 f = fopen("/dev/urandom", "rb"); 230 if (f == NULL) { 231 printf("Could not open /dev/urandom.\n"); 232 return -1; 233 } 234 235 rc = fread(buf, 1, len, f); 236 fclose(f); 237 238 return rc != len ? -1 : 0; 239 } 240 241 242 unsigned long os_random(void) 243 { 244 return random(); 245 } 246 247 248 char * os_rel2abs_path(const char *rel_path) 249 { 250 char *buf = NULL, *cwd, *ret; 251 size_t len = 128, cwd_len, rel_len, ret_len; 252 int last_errno; 253 254 if (!rel_path) 255 return NULL; 256 257 if (rel_path[0] == '/') 258 return os_strdup(rel_path); 259 260 for (;;) { 261 buf = os_malloc(len); 262 if (buf == NULL) 263 return NULL; 264 cwd = getcwd(buf, len); 265 if (cwd == NULL) { 266 last_errno = errno; 267 os_free(buf); 268 if (last_errno != ERANGE) 269 return NULL; 270 len *= 2; 271 if (len > 2000) 272 return NULL; 273 } else { 274 buf[len - 1] = '\0'; 275 break; 276 } 277 } 278 279 cwd_len = os_strlen(cwd); 280 rel_len = os_strlen(rel_path); 281 ret_len = cwd_len + 1 + rel_len + 1; 282 ret = os_malloc(ret_len); 283 if (ret) { 284 os_memcpy(ret, cwd, cwd_len); 285 ret[cwd_len] = '/'; 286 os_memcpy(ret + cwd_len + 1, rel_path, rel_len); 287 ret[ret_len - 1] = '\0'; 288 } 289 os_free(buf); 290 return ret; 291 } 292 293 294 int os_program_init(void) 295 { 296 #ifdef ANDROID 297 /* 298 * We ignore errors here since errors are normal if we 299 * are already running as non-root. 300 */ 301 #ifdef ANDROID_SETGROUPS_OVERRIDE 302 gid_t groups[] = { ANDROID_SETGROUPS_OVERRIDE }; 303 #else /* ANDROID_SETGROUPS_OVERRIDE */ 304 gid_t groups[] = { AID_INET, AID_WIFI, AID_KEYSTORE }; 305 #endif /* ANDROID_SETGROUPS_OVERRIDE */ 306 struct __user_cap_header_struct header; 307 struct __user_cap_data_struct cap; 308 309 setgroups(ARRAY_SIZE(groups), groups); 310 311 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0); 312 313 setgid(AID_WIFI); 314 setuid(AID_WIFI); 315 316 header.version = _LINUX_CAPABILITY_VERSION; 317 header.pid = 0; 318 cap.effective = cap.permitted = 319 (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW); 320 cap.inheritable = 0; 321 capset(&header, &cap); 322 #endif /* ANDROID */ 323 324 return 0; 325 } 326 327 328 void os_program_deinit(void) 329 { 330 #ifdef WPA_TRACE 331 struct os_alloc_trace *a; 332 unsigned long total = 0; 333 dl_list_for_each(a, &alloc_list, struct os_alloc_trace, list) { 334 total += a->len; 335 if (a->magic != ALLOC_MAGIC) { 336 wpa_printf(MSG_INFO, "MEMLEAK[%p]: invalid magic 0x%x " 337 "len %lu", 338 a, a->magic, (unsigned long) a->len); 339 continue; 340 } 341 wpa_printf(MSG_INFO, "MEMLEAK[%p]: len %lu", 342 a, (unsigned long) a->len); 343 wpa_trace_dump("memleak", a); 344 } 345 if (total) 346 wpa_printf(MSG_INFO, "MEMLEAK: total %lu bytes", 347 (unsigned long) total); 348 #endif /* WPA_TRACE */ 349 } 350 351 352 int os_setenv(const char *name, const char *value, int overwrite) 353 { 354 return setenv(name, value, overwrite); 355 } 356 357 358 int os_unsetenv(const char *name) 359 { 360 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || \ 361 defined(__OpenBSD__) 362 unsetenv(name); 363 return 0; 364 #else 365 return unsetenv(name); 366 #endif 367 } 368 369 370 char * os_readfile(const char *name, size_t *len) 371 { 372 FILE *f; 373 char *buf; 374 long pos; 375 376 f = fopen(name, "rb"); 377 if (f == NULL) 378 return NULL; 379 380 if (fseek(f, 0, SEEK_END) < 0 || (pos = ftell(f)) < 0) { 381 fclose(f); 382 return NULL; 383 } 384 *len = pos; 385 if (fseek(f, 0, SEEK_SET) < 0) { 386 fclose(f); 387 return NULL; 388 } 389 390 buf = os_malloc(*len); 391 if (buf == NULL) { 392 fclose(f); 393 return NULL; 394 } 395 396 if (fread(buf, 1, *len, f) != *len) { 397 fclose(f); 398 os_free(buf); 399 return NULL; 400 } 401 402 fclose(f); 403 404 return buf; 405 } 406 407 408 int os_file_exists(const char *fname) 409 { 410 FILE *f = fopen(fname, "rb"); 411 if (f == NULL) 412 return 0; 413 fclose(f); 414 return 1; 415 } 416 417 418 int os_fsync(FILE *stream) 419 { 420 if (!fflush(stream)) 421 return fsync(fileno(stream)); 422 return -1; 423 } 424 425 426 #ifndef WPA_TRACE 427 void * os_zalloc(size_t size) 428 { 429 return calloc(1, size); 430 } 431 #endif /* WPA_TRACE */ 432 433 434 size_t os_strlcpy(char *dest, const char *src, size_t siz) 435 { 436 const char *s = src; 437 size_t left = siz; 438 439 if (left) { 440 /* Copy string up to the maximum size of the dest buffer */ 441 while (--left != 0) { 442 if ((*dest++ = *s++) == '\0') 443 break; 444 } 445 } 446 447 if (left == 0) { 448 /* Not enough room for the string; force NUL-termination */ 449 if (siz != 0) 450 *dest = '\0'; 451 while (*s++) 452 ; /* determine total src string length */ 453 } 454 455 return s - src - 1; 456 } 457 458 459 int os_memcmp_const(const void *a, const void *b, size_t len) 460 { 461 const u8 *aa = a; 462 const u8 *bb = b; 463 size_t i; 464 u8 res; 465 466 for (res = 0, i = 0; i < len; i++) 467 res |= aa[i] ^ bb[i]; 468 469 return res; 470 } 471 472 473 #ifdef WPA_TRACE 474 475 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS) 476 char wpa_trace_fail_func[256] = { 0 }; 477 unsigned int wpa_trace_fail_after; 478 479 static int testing_fail_alloc(void) 480 { 481 const char *func[WPA_TRACE_LEN]; 482 size_t i, res, len; 483 char *pos, *next; 484 int match; 485 486 if (!wpa_trace_fail_after) 487 return 0; 488 489 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 490 i = 0; 491 if (i < res && os_strcmp(func[i], __func__) == 0) 492 i++; 493 if (i < res && os_strcmp(func[i], "os_malloc") == 0) 494 i++; 495 if (i < res && os_strcmp(func[i], "os_zalloc") == 0) 496 i++; 497 if (i < res && os_strcmp(func[i], "os_calloc") == 0) 498 i++; 499 if (i < res && os_strcmp(func[i], "os_realloc") == 0) 500 i++; 501 if (i < res && os_strcmp(func[i], "os_realloc_array") == 0) 502 i++; 503 if (i < res && os_strcmp(func[i], "os_strdup") == 0) 504 i++; 505 506 pos = wpa_trace_fail_func; 507 508 match = 0; 509 while (i < res) { 510 int allow_skip = 1; 511 int maybe = 0; 512 513 if (*pos == '=') { 514 allow_skip = 0; 515 pos++; 516 } else if (*pos == '?') { 517 maybe = 1; 518 pos++; 519 } 520 next = os_strchr(pos, ';'); 521 if (next) 522 len = next - pos; 523 else 524 len = os_strlen(pos); 525 if (os_memcmp(pos, func[i], len) != 0) { 526 if (maybe && next) { 527 pos = next + 1; 528 continue; 529 } 530 if (allow_skip) { 531 i++; 532 continue; 533 } 534 return 0; 535 } 536 if (!next) { 537 match = 1; 538 break; 539 } 540 pos = next + 1; 541 i++; 542 } 543 if (!match) 544 return 0; 545 546 wpa_trace_fail_after--; 547 if (wpa_trace_fail_after == 0) { 548 wpa_printf(MSG_INFO, "TESTING: fail allocation at %s", 549 wpa_trace_fail_func); 550 for (i = 0; i < res; i++) 551 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 552 (int) i, func[i]); 553 return 1; 554 } 555 556 return 0; 557 } 558 559 #else 560 561 static inline int testing_fail_alloc(void) 562 { 563 return 0; 564 } 565 #endif 566 567 void * os_malloc(size_t size) 568 { 569 struct os_alloc_trace *a; 570 571 if (testing_fail_alloc()) 572 return NULL; 573 574 a = malloc(sizeof(*a) + size); 575 if (a == NULL) 576 return NULL; 577 a->magic = ALLOC_MAGIC; 578 dl_list_add(&alloc_list, &a->list); 579 a->len = size; 580 wpa_trace_record(a); 581 return a + 1; 582 } 583 584 585 void * os_realloc(void *ptr, size_t size) 586 { 587 struct os_alloc_trace *a; 588 size_t copy_len; 589 void *n; 590 591 if (ptr == NULL) 592 return os_malloc(size); 593 594 a = (struct os_alloc_trace *) ptr - 1; 595 if (a->magic != ALLOC_MAGIC) { 596 wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s", 597 a, a->magic, 598 a->magic == FREED_MAGIC ? " (already freed)" : ""); 599 wpa_trace_show("Invalid os_realloc() call"); 600 abort(); 601 } 602 n = os_malloc(size); 603 if (n == NULL) 604 return NULL; 605 copy_len = a->len; 606 if (copy_len > size) 607 copy_len = size; 608 os_memcpy(n, a + 1, copy_len); 609 os_free(ptr); 610 return n; 611 } 612 613 614 void os_free(void *ptr) 615 { 616 struct os_alloc_trace *a; 617 618 if (ptr == NULL) 619 return; 620 a = (struct os_alloc_trace *) ptr - 1; 621 if (a->magic != ALLOC_MAGIC) { 622 wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s", 623 a, a->magic, 624 a->magic == FREED_MAGIC ? " (already freed)" : ""); 625 wpa_trace_show("Invalid os_free() call"); 626 abort(); 627 } 628 dl_list_del(&a->list); 629 a->magic = FREED_MAGIC; 630 631 wpa_trace_check_ref(ptr); 632 free(a); 633 } 634 635 636 void * os_zalloc(size_t size) 637 { 638 void *ptr = os_malloc(size); 639 if (ptr) 640 os_memset(ptr, 0, size); 641 return ptr; 642 } 643 644 645 char * os_strdup(const char *s) 646 { 647 size_t len; 648 char *d; 649 len = os_strlen(s); 650 d = os_malloc(len + 1); 651 if (d == NULL) 652 return NULL; 653 os_memcpy(d, s, len); 654 d[len] = '\0'; 655 return d; 656 } 657 658 #endif /* WPA_TRACE */ 659 660 661 int os_exec(const char *program, const char *arg, int wait_completion) 662 { 663 pid_t pid; 664 int pid_status; 665 666 pid = fork(); 667 if (pid < 0) { 668 perror("fork"); 669 return -1; 670 } 671 672 if (pid == 0) { 673 /* run the external command in the child process */ 674 const int MAX_ARG = 30; 675 char *_program, *_arg, *pos; 676 char *argv[MAX_ARG + 1]; 677 int i; 678 679 _program = os_strdup(program); 680 _arg = os_strdup(arg); 681 682 argv[0] = _program; 683 684 i = 1; 685 pos = _arg; 686 while (i < MAX_ARG && pos && *pos) { 687 while (*pos == ' ') 688 pos++; 689 if (*pos == '\0') 690 break; 691 argv[i++] = pos; 692 pos = os_strchr(pos, ' '); 693 if (pos) 694 *pos++ = '\0'; 695 } 696 argv[i] = NULL; 697 698 execv(program, argv); 699 perror("execv"); 700 os_free(_program); 701 os_free(_arg); 702 exit(0); 703 return -1; 704 } 705 706 if (wait_completion) { 707 /* wait for the child process to complete in the parent */ 708 waitpid(pid, &pid_status, 0); 709 } 710 711 return 0; 712 } 713
