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 #ifdef __MACH__ 21 #include <CoreServices/CoreServices.h> 22 #include <mach/mach.h> 23 #include <mach/mach_time.h> 24 #endif /* __MACH__ */ 25 26 #include "os.h" 27 #include "common.h" 28 29 #ifdef WPA_TRACE 30 31 #include "wpa_debug.h" 32 #include "trace.h" 33 #include "list.h" 34 35 static struct dl_list alloc_list = DL_LIST_HEAD_INIT(alloc_list); 36 37 #define ALLOC_MAGIC 0xa84ef1b2 38 #define FREED_MAGIC 0x67fd487a 39 40 struct os_alloc_trace { 41 unsigned int magic; 42 struct dl_list list; 43 size_t len; 44 WPA_TRACE_INFO 45 } __attribute__((aligned(16))); 46 47 #endif /* WPA_TRACE */ 48 49 50 void os_sleep(os_time_t sec, os_time_t usec) 51 { 52 if (sec) 53 sleep(sec); 54 if (usec) 55 usleep(usec); 56 } 57 58 59 int os_get_time(struct os_time *t) 60 { 61 int res; 62 struct timeval tv; 63 res = gettimeofday(&tv, NULL); 64 t->sec = tv.tv_sec; 65 t->usec = tv.tv_usec; 66 return res; 67 } 68 69 70 int os_get_reltime(struct os_reltime *t) 71 { 72 #ifndef __MACH__ 73 #if defined(CLOCK_BOOTTIME) 74 static clockid_t clock_id = CLOCK_BOOTTIME; 75 #elif defined(CLOCK_MONOTONIC) 76 static clockid_t clock_id = CLOCK_MONOTONIC; 77 #else 78 static clockid_t clock_id = CLOCK_REALTIME; 79 #endif 80 struct timespec ts; 81 int res; 82 83 if (TEST_FAIL()) 84 return -1; 85 86 while (1) { 87 res = clock_gettime(clock_id, &ts); 88 if (res == 0) { 89 t->sec = ts.tv_sec; 90 t->usec = ts.tv_nsec / 1000; 91 return 0; 92 } 93 switch (clock_id) { 94 #ifdef CLOCK_BOOTTIME 95 case CLOCK_BOOTTIME: 96 clock_id = CLOCK_MONOTONIC; 97 break; 98 #endif 99 #ifdef CLOCK_MONOTONIC 100 case CLOCK_MONOTONIC: 101 clock_id = CLOCK_REALTIME; 102 break; 103 #endif 104 case CLOCK_REALTIME: 105 return -1; 106 } 107 } 108 #else /* __MACH__ */ 109 uint64_t abstime, nano; 110 static mach_timebase_info_data_t info = { 0, 0 }; 111 112 if (!info.denom) { 113 if (mach_timebase_info(&info) != KERN_SUCCESS) 114 return -1; 115 } 116 117 abstime = mach_absolute_time(); 118 nano = (abstime * info.numer) / info.denom; 119 120 t->sec = nano / NSEC_PER_SEC; 121 t->usec = (nano - (((uint64_t) t->sec) * NSEC_PER_SEC)) / NSEC_PER_USEC; 122 123 return 0; 124 #endif /* __MACH__ */ 125 } 126 127 128 int os_mktime(int year, int month, int day, int hour, int min, int sec, 129 os_time_t *t) 130 { 131 struct tm tm, *tm1; 132 time_t t_local, t1, t2; 133 os_time_t tz_offset; 134 135 if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 || 136 hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 || 137 sec > 60) 138 return -1; 139 140 memset(&tm, 0, sizeof(tm)); 141 tm.tm_year = year - 1900; 142 tm.tm_mon = month - 1; 143 tm.tm_mday = day; 144 tm.tm_hour = hour; 145 tm.tm_min = min; 146 tm.tm_sec = sec; 147 148 t_local = mktime(&tm); 149 150 /* figure out offset to UTC */ 151 tm1 = localtime(&t_local); 152 if (tm1) { 153 t1 = mktime(tm1); 154 tm1 = gmtime(&t_local); 155 if (tm1) { 156 t2 = mktime(tm1); 157 tz_offset = t2 - t1; 158 } else 159 tz_offset = 0; 160 } else 161 tz_offset = 0; 162 163 *t = (os_time_t) t_local - tz_offset; 164 return 0; 165 } 166 167 168 int os_gmtime(os_time_t t, struct os_tm *tm) 169 { 170 struct tm *tm2; 171 time_t t2 = t; 172 173 tm2 = gmtime(&t2); 174 if (tm2 == NULL) 175 return -1; 176 tm->sec = tm2->tm_sec; 177 tm->min = tm2->tm_min; 178 tm->hour = tm2->tm_hour; 179 tm->day = tm2->tm_mday; 180 tm->month = tm2->tm_mon + 1; 181 tm->year = tm2->tm_year + 1900; 182 return 0; 183 } 184 185 186 #ifdef __APPLE__ 187 #include <fcntl.h> 188 static int os_daemon(int nochdir, int noclose) 189 { 190 int devnull; 191 192 if (chdir("/") < 0) 193 return -1; 194 195 devnull = open("/dev/null", O_RDWR); 196 if (devnull < 0) 197 return -1; 198 199 if (dup2(devnull, STDIN_FILENO) < 0) { 200 close(devnull); 201 return -1; 202 } 203 204 if (dup2(devnull, STDOUT_FILENO) < 0) { 205 close(devnull); 206 return -1; 207 } 208 209 if (dup2(devnull, STDERR_FILENO) < 0) { 210 close(devnull); 211 return -1; 212 } 213 214 return 0; 215 } 216 #else /* __APPLE__ */ 217 #define os_daemon daemon 218 #endif /* __APPLE__ */ 219 220 221 int os_daemonize(const char *pid_file) 222 { 223 #if defined(__uClinux__) || defined(__sun__) 224 return -1; 225 #else /* defined(__uClinux__) || defined(__sun__) */ 226 if (os_daemon(0, 0)) { 227 perror("daemon"); 228 return -1; 229 } 230 231 if (pid_file) { 232 FILE *f = fopen(pid_file, "w"); 233 if (f) { 234 fprintf(f, "%u\n", getpid()); 235 fclose(f); 236 } 237 } 238 239 return -0; 240 #endif /* defined(__uClinux__) || defined(__sun__) */ 241 } 242 243 244 void os_daemonize_terminate(const char *pid_file) 245 { 246 if (pid_file) 247 unlink(pid_file); 248 } 249 250 251 int os_get_random(unsigned char *buf, size_t len) 252 { 253 FILE *f; 254 size_t rc; 255 256 if (TEST_FAIL()) 257 return -1; 258 259 f = fopen("/dev/urandom", "rb"); 260 if (f == NULL) { 261 printf("Could not open /dev/urandom.\n"); 262 return -1; 263 } 264 265 rc = fread(buf, 1, len, f); 266 fclose(f); 267 268 return rc != len ? -1 : 0; 269 } 270 271 272 unsigned long os_random(void) 273 { 274 return random(); 275 } 276 277 278 char * os_rel2abs_path(const char *rel_path) 279 { 280 char *buf = NULL, *cwd, *ret; 281 size_t len = 128, cwd_len, rel_len, ret_len; 282 int last_errno; 283 284 if (!rel_path) 285 return NULL; 286 287 if (rel_path[0] == '/') 288 return os_strdup(rel_path); 289 290 for (;;) { 291 buf = os_malloc(len); 292 if (buf == NULL) 293 return NULL; 294 cwd = getcwd(buf, len); 295 if (cwd == NULL) { 296 last_errno = errno; 297 os_free(buf); 298 if (last_errno != ERANGE) 299 return NULL; 300 len *= 2; 301 if (len > 2000) 302 return NULL; 303 } else { 304 buf[len - 1] = '\0'; 305 break; 306 } 307 } 308 309 cwd_len = os_strlen(cwd); 310 rel_len = os_strlen(rel_path); 311 ret_len = cwd_len + 1 + rel_len + 1; 312 ret = os_malloc(ret_len); 313 if (ret) { 314 os_memcpy(ret, cwd, cwd_len); 315 ret[cwd_len] = '/'; 316 os_memcpy(ret + cwd_len + 1, rel_path, rel_len); 317 ret[ret_len - 1] = '\0'; 318 } 319 os_free(buf); 320 return ret; 321 } 322 323 324 int os_program_init(void) 325 { 326 #ifdef ANDROID 327 /* 328 * We ignore errors here since errors are normal if we 329 * are already running as non-root. 330 */ 331 #ifdef ANDROID_SETGROUPS_OVERRIDE 332 gid_t groups[] = { ANDROID_SETGROUPS_OVERRIDE }; 333 #else /* ANDROID_SETGROUPS_OVERRIDE */ 334 gid_t groups[] = { AID_INET, AID_WIFI, AID_KEYSTORE }; 335 #endif /* ANDROID_SETGROUPS_OVERRIDE */ 336 struct __user_cap_header_struct header; 337 struct __user_cap_data_struct cap; 338 339 setgroups(ARRAY_SIZE(groups), groups); 340 341 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0); 342 343 setgid(AID_WIFI); 344 setuid(AID_WIFI); 345 346 header.version = _LINUX_CAPABILITY_VERSION; 347 header.pid = 0; 348 cap.effective = cap.permitted = 349 (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW); 350 cap.inheritable = 0; 351 capset(&header, &cap); 352 #endif /* ANDROID */ 353 354 return 0; 355 } 356 357 358 void os_program_deinit(void) 359 { 360 #ifdef WPA_TRACE 361 struct os_alloc_trace *a; 362 unsigned long total = 0; 363 dl_list_for_each(a, &alloc_list, struct os_alloc_trace, list) { 364 total += a->len; 365 if (a->magic != ALLOC_MAGIC) { 366 wpa_printf(MSG_INFO, "MEMLEAK[%p]: invalid magic 0x%x " 367 "len %lu", 368 a, a->magic, (unsigned long) a->len); 369 continue; 370 } 371 wpa_printf(MSG_INFO, "MEMLEAK[%p]: len %lu", 372 a, (unsigned long) a->len); 373 wpa_trace_dump("memleak", a); 374 } 375 if (total) 376 wpa_printf(MSG_INFO, "MEMLEAK: total %lu bytes", 377 (unsigned long) total); 378 wpa_trace_deinit(); 379 #endif /* WPA_TRACE */ 380 } 381 382 383 int os_setenv(const char *name, const char *value, int overwrite) 384 { 385 return setenv(name, value, overwrite); 386 } 387 388 389 int os_unsetenv(const char *name) 390 { 391 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || \ 392 defined(__OpenBSD__) 393 unsetenv(name); 394 return 0; 395 #else 396 return unsetenv(name); 397 #endif 398 } 399 400 401 char * os_readfile(const char *name, size_t *len) 402 { 403 FILE *f; 404 char *buf; 405 long pos; 406 407 f = fopen(name, "rb"); 408 if (f == NULL) 409 return NULL; 410 411 if (fseek(f, 0, SEEK_END) < 0 || (pos = ftell(f)) < 0) { 412 fclose(f); 413 return NULL; 414 } 415 *len = pos; 416 if (fseek(f, 0, SEEK_SET) < 0) { 417 fclose(f); 418 return NULL; 419 } 420 421 buf = os_malloc(*len); 422 if (buf == NULL) { 423 fclose(f); 424 return NULL; 425 } 426 427 if (fread(buf, 1, *len, f) != *len) { 428 fclose(f); 429 os_free(buf); 430 return NULL; 431 } 432 433 fclose(f); 434 435 return buf; 436 } 437 438 439 int os_file_exists(const char *fname) 440 { 441 return access(fname, F_OK) == 0; 442 } 443 444 445 int os_fdatasync(FILE *stream) 446 { 447 if (!fflush(stream)) { 448 #ifdef __linux__ 449 return fdatasync(fileno(stream)); 450 #else /* !__linux__ */ 451 #ifdef F_FULLFSYNC 452 /* OS X does not implement fdatasync(). */ 453 return fcntl(fileno(stream), F_FULLFSYNC); 454 #else /* F_FULLFSYNC */ 455 return fsync(fileno(stream)); 456 #endif /* F_FULLFSYNC */ 457 #endif /* __linux__ */ 458 } 459 460 return -1; 461 } 462 463 464 #ifndef WPA_TRACE 465 void * os_zalloc(size_t size) 466 { 467 return calloc(1, size); 468 } 469 #endif /* WPA_TRACE */ 470 471 472 size_t os_strlcpy(char *dest, const char *src, size_t siz) 473 { 474 const char *s = src; 475 size_t left = siz; 476 477 if (left) { 478 /* Copy string up to the maximum size of the dest buffer */ 479 while (--left != 0) { 480 if ((*dest++ = *s++) == '\0') 481 break; 482 } 483 } 484 485 if (left == 0) { 486 /* Not enough room for the string; force NUL-termination */ 487 if (siz != 0) 488 *dest = '\0'; 489 while (*s++) 490 ; /* determine total src string length */ 491 } 492 493 return s - src - 1; 494 } 495 496 497 int os_memcmp_const(const void *a, const void *b, size_t len) 498 { 499 const u8 *aa = a; 500 const u8 *bb = b; 501 size_t i; 502 u8 res; 503 504 for (res = 0, i = 0; i < len; i++) 505 res |= aa[i] ^ bb[i]; 506 507 return res; 508 } 509 510 511 #ifdef WPA_TRACE 512 513 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS) 514 char wpa_trace_fail_func[256] = { 0 }; 515 unsigned int wpa_trace_fail_after; 516 517 static int testing_fail_alloc(void) 518 { 519 const char *func[WPA_TRACE_LEN]; 520 size_t i, res, len; 521 char *pos, *next; 522 int match; 523 524 if (!wpa_trace_fail_after) 525 return 0; 526 527 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 528 i = 0; 529 if (i < res && os_strcmp(func[i], __func__) == 0) 530 i++; 531 if (i < res && os_strcmp(func[i], "os_malloc") == 0) 532 i++; 533 if (i < res && os_strcmp(func[i], "os_zalloc") == 0) 534 i++; 535 if (i < res && os_strcmp(func[i], "os_calloc") == 0) 536 i++; 537 if (i < res && os_strcmp(func[i], "os_realloc") == 0) 538 i++; 539 if (i < res && os_strcmp(func[i], "os_realloc_array") == 0) 540 i++; 541 if (i < res && os_strcmp(func[i], "os_strdup") == 0) 542 i++; 543 544 pos = wpa_trace_fail_func; 545 546 match = 0; 547 while (i < res) { 548 int allow_skip = 1; 549 int maybe = 0; 550 551 if (*pos == '=') { 552 allow_skip = 0; 553 pos++; 554 } else if (*pos == '?') { 555 maybe = 1; 556 pos++; 557 } 558 next = os_strchr(pos, ';'); 559 if (next) 560 len = next - pos; 561 else 562 len = os_strlen(pos); 563 if (os_memcmp(pos, func[i], len) != 0) { 564 if (maybe && next) { 565 pos = next + 1; 566 continue; 567 } 568 if (allow_skip) { 569 i++; 570 continue; 571 } 572 return 0; 573 } 574 if (!next) { 575 match = 1; 576 break; 577 } 578 pos = next + 1; 579 i++; 580 } 581 if (!match) 582 return 0; 583 584 wpa_trace_fail_after--; 585 if (wpa_trace_fail_after == 0) { 586 wpa_printf(MSG_INFO, "TESTING: fail allocation at %s", 587 wpa_trace_fail_func); 588 for (i = 0; i < res; i++) 589 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 590 (int) i, func[i]); 591 return 1; 592 } 593 594 return 0; 595 } 596 597 598 char wpa_trace_test_fail_func[256] = { 0 }; 599 unsigned int wpa_trace_test_fail_after; 600 601 int testing_test_fail(void) 602 { 603 const char *func[WPA_TRACE_LEN]; 604 size_t i, res, len; 605 char *pos, *next; 606 int match; 607 608 if (!wpa_trace_test_fail_after) 609 return 0; 610 611 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 612 i = 0; 613 if (i < res && os_strcmp(func[i], __func__) == 0) 614 i++; 615 616 pos = wpa_trace_test_fail_func; 617 618 match = 0; 619 while (i < res) { 620 int allow_skip = 1; 621 int maybe = 0; 622 623 if (*pos == '=') { 624 allow_skip = 0; 625 pos++; 626 } else if (*pos == '?') { 627 maybe = 1; 628 pos++; 629 } 630 next = os_strchr(pos, ';'); 631 if (next) 632 len = next - pos; 633 else 634 len = os_strlen(pos); 635 if (os_memcmp(pos, func[i], len) != 0) { 636 if (maybe && next) { 637 pos = next + 1; 638 continue; 639 } 640 if (allow_skip) { 641 i++; 642 continue; 643 } 644 return 0; 645 } 646 if (!next) { 647 match = 1; 648 break; 649 } 650 pos = next + 1; 651 i++; 652 } 653 if (!match) 654 return 0; 655 656 wpa_trace_test_fail_after--; 657 if (wpa_trace_test_fail_after == 0) { 658 wpa_printf(MSG_INFO, "TESTING: fail at %s", 659 wpa_trace_test_fail_func); 660 for (i = 0; i < res; i++) 661 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 662 (int) i, func[i]); 663 return 1; 664 } 665 666 return 0; 667 } 668 669 #else 670 671 static inline int testing_fail_alloc(void) 672 { 673 return 0; 674 } 675 #endif 676 677 void * os_malloc(size_t size) 678 { 679 struct os_alloc_trace *a; 680 681 if (testing_fail_alloc()) 682 return NULL; 683 684 a = malloc(sizeof(*a) + size); 685 if (a == NULL) 686 return NULL; 687 a->magic = ALLOC_MAGIC; 688 dl_list_add(&alloc_list, &a->list); 689 a->len = size; 690 wpa_trace_record(a); 691 return a + 1; 692 } 693 694 695 void * os_realloc(void *ptr, size_t size) 696 { 697 struct os_alloc_trace *a; 698 size_t copy_len; 699 void *n; 700 701 if (ptr == NULL) 702 return os_malloc(size); 703 704 a = (struct os_alloc_trace *) ptr - 1; 705 if (a->magic != ALLOC_MAGIC) { 706 wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s", 707 a, a->magic, 708 a->magic == FREED_MAGIC ? " (already freed)" : ""); 709 wpa_trace_show("Invalid os_realloc() call"); 710 abort(); 711 } 712 n = os_malloc(size); 713 if (n == NULL) 714 return NULL; 715 copy_len = a->len; 716 if (copy_len > size) 717 copy_len = size; 718 os_memcpy(n, a + 1, copy_len); 719 os_free(ptr); 720 return n; 721 } 722 723 724 void os_free(void *ptr) 725 { 726 struct os_alloc_trace *a; 727 728 if (ptr == NULL) 729 return; 730 a = (struct os_alloc_trace *) ptr - 1; 731 if (a->magic != ALLOC_MAGIC) { 732 wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s", 733 a, a->magic, 734 a->magic == FREED_MAGIC ? " (already freed)" : ""); 735 wpa_trace_show("Invalid os_free() call"); 736 abort(); 737 } 738 dl_list_del(&a->list); 739 a->magic = FREED_MAGIC; 740 741 wpa_trace_check_ref(ptr); 742 free(a); 743 } 744 745 746 void * os_zalloc(size_t size) 747 { 748 void *ptr = os_malloc(size); 749 if (ptr) 750 os_memset(ptr, 0, size); 751 return ptr; 752 } 753 754 755 char * os_strdup(const char *s) 756 { 757 size_t len; 758 char *d; 759 len = os_strlen(s); 760 d = os_malloc(len + 1); 761 if (d == NULL) 762 return NULL; 763 os_memcpy(d, s, len); 764 d[len] = '\0'; 765 return d; 766 } 767 768 #endif /* WPA_TRACE */ 769 770 771 int os_exec(const char *program, const char *arg, int wait_completion) 772 { 773 pid_t pid; 774 int pid_status; 775 776 pid = fork(); 777 if (pid < 0) { 778 perror("fork"); 779 return -1; 780 } 781 782 if (pid == 0) { 783 /* run the external command in the child process */ 784 const int MAX_ARG = 30; 785 char *_program, *_arg, *pos; 786 char *argv[MAX_ARG + 1]; 787 int i; 788 789 _program = os_strdup(program); 790 _arg = os_strdup(arg); 791 792 argv[0] = _program; 793 794 i = 1; 795 pos = _arg; 796 while (i < MAX_ARG && pos && *pos) { 797 while (*pos == ' ') 798 pos++; 799 if (*pos == '\0') 800 break; 801 argv[i++] = pos; 802 pos = os_strchr(pos, ' '); 803 if (pos) 804 *pos++ = '\0'; 805 } 806 argv[i] = NULL; 807 808 execv(program, argv); 809 perror("execv"); 810 os_free(_program); 811 os_free(_arg); 812 exit(0); 813 return -1; 814 } 815 816 if (wait_completion) { 817 /* wait for the child process to complete in the parent */ 818 waitpid(pid, &pid_status, 0); 819 } 820 821 return 0; 822 } 823
