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 <grp.h> 16 #include <pwd.h> 17 #include <sys/capability.h> 18 #include <sys/prctl.h> 19 #include <sys/types.h> 20 #endif /* ANDROID */ 21 22 #ifdef __MACH__ 23 #include <CoreServices/CoreServices.h> 24 #include <mach/mach.h> 25 #include <mach/mach_time.h> 26 #endif /* __MACH__ */ 27 28 #include "os.h" 29 #include "common.h" 30 31 #ifdef WPA_TRACE 32 33 #include "wpa_debug.h" 34 #include "trace.h" 35 #include "list.h" 36 37 static struct dl_list alloc_list = DL_LIST_HEAD_INIT(alloc_list); 38 39 #define ALLOC_MAGIC 0xa84ef1b2 40 #define FREED_MAGIC 0x67fd487a 41 42 struct os_alloc_trace { 43 unsigned int magic; 44 struct dl_list list; 45 size_t len; 46 WPA_TRACE_INFO 47 } __attribute__((aligned(16))); 48 49 #endif /* WPA_TRACE */ 50 51 52 void os_sleep(os_time_t sec, os_time_t usec) 53 { 54 if (sec) 55 sleep(sec); 56 if (usec) 57 usleep(usec); 58 } 59 60 61 int os_get_time(struct os_time *t) 62 { 63 int res; 64 struct timeval tv; 65 res = gettimeofday(&tv, NULL); 66 t->sec = tv.tv_sec; 67 t->usec = tv.tv_usec; 68 return res; 69 } 70 71 72 int os_get_reltime(struct os_reltime *t) 73 { 74 #ifndef __MACH__ 75 #if defined(CLOCK_BOOTTIME) 76 static clockid_t clock_id = CLOCK_BOOTTIME; 77 #elif defined(CLOCK_MONOTONIC) 78 static clockid_t clock_id = CLOCK_MONOTONIC; 79 #else 80 static clockid_t clock_id = CLOCK_REALTIME; 81 #endif 82 struct timespec ts; 83 int res; 84 85 if (TEST_FAIL()) 86 return -1; 87 88 while (1) { 89 res = clock_gettime(clock_id, &ts); 90 if (res == 0) { 91 t->sec = ts.tv_sec; 92 t->usec = ts.tv_nsec / 1000; 93 return 0; 94 } 95 switch (clock_id) { 96 #ifdef CLOCK_BOOTTIME 97 case CLOCK_BOOTTIME: 98 clock_id = CLOCK_MONOTONIC; 99 break; 100 #endif 101 #ifdef CLOCK_MONOTONIC 102 case CLOCK_MONOTONIC: 103 clock_id = CLOCK_REALTIME; 104 break; 105 #endif 106 case CLOCK_REALTIME: 107 return -1; 108 } 109 } 110 #else /* __MACH__ */ 111 uint64_t abstime, nano; 112 static mach_timebase_info_data_t info = { 0, 0 }; 113 114 if (!info.denom) { 115 if (mach_timebase_info(&info) != KERN_SUCCESS) 116 return -1; 117 } 118 119 abstime = mach_absolute_time(); 120 nano = (abstime * info.numer) / info.denom; 121 122 t->sec = nano / NSEC_PER_SEC; 123 t->usec = (nano - (((uint64_t) t->sec) * NSEC_PER_SEC)) / NSEC_PER_USEC; 124 125 return 0; 126 #endif /* __MACH__ */ 127 } 128 129 130 int os_mktime(int year, int month, int day, int hour, int min, int sec, 131 os_time_t *t) 132 { 133 struct tm tm, *tm1; 134 time_t t_local, t1, t2; 135 os_time_t tz_offset; 136 137 if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 || 138 hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 || 139 sec > 60) 140 return -1; 141 142 memset(&tm, 0, sizeof(tm)); 143 tm.tm_year = year - 1900; 144 tm.tm_mon = month - 1; 145 tm.tm_mday = day; 146 tm.tm_hour = hour; 147 tm.tm_min = min; 148 tm.tm_sec = sec; 149 150 t_local = mktime(&tm); 151 152 /* figure out offset to UTC */ 153 tm1 = localtime(&t_local); 154 if (tm1) { 155 t1 = mktime(tm1); 156 tm1 = gmtime(&t_local); 157 if (tm1) { 158 t2 = mktime(tm1); 159 tz_offset = t2 - t1; 160 } else 161 tz_offset = 0; 162 } else 163 tz_offset = 0; 164 165 *t = (os_time_t) t_local - tz_offset; 166 return 0; 167 } 168 169 170 int os_gmtime(os_time_t t, struct os_tm *tm) 171 { 172 struct tm *tm2; 173 time_t t2 = t; 174 175 tm2 = gmtime(&t2); 176 if (tm2 == NULL) 177 return -1; 178 tm->sec = tm2->tm_sec; 179 tm->min = tm2->tm_min; 180 tm->hour = tm2->tm_hour; 181 tm->day = tm2->tm_mday; 182 tm->month = tm2->tm_mon + 1; 183 tm->year = tm2->tm_year + 1900; 184 return 0; 185 } 186 187 188 #ifdef __APPLE__ 189 #include <fcntl.h> 190 static int os_daemon(int nochdir, int noclose) 191 { 192 int devnull; 193 194 if (chdir("/") < 0) 195 return -1; 196 197 devnull = open("/dev/null", O_RDWR); 198 if (devnull < 0) 199 return -1; 200 201 if (dup2(devnull, STDIN_FILENO) < 0) { 202 close(devnull); 203 return -1; 204 } 205 206 if (dup2(devnull, STDOUT_FILENO) < 0) { 207 close(devnull); 208 return -1; 209 } 210 211 if (dup2(devnull, STDERR_FILENO) < 0) { 212 close(devnull); 213 return -1; 214 } 215 216 return 0; 217 } 218 #else /* __APPLE__ */ 219 #define os_daemon daemon 220 #endif /* __APPLE__ */ 221 222 223 int os_daemonize(const char *pid_file) 224 { 225 #if defined(__uClinux__) || defined(__sun__) 226 return -1; 227 #else /* defined(__uClinux__) || defined(__sun__) */ 228 if (os_daemon(0, 0)) { 229 perror("daemon"); 230 return -1; 231 } 232 233 if (pid_file) { 234 FILE *f = fopen(pid_file, "w"); 235 if (f) { 236 fprintf(f, "%u\n", getpid()); 237 fclose(f); 238 } 239 } 240 241 return -0; 242 #endif /* defined(__uClinux__) || defined(__sun__) */ 243 } 244 245 246 void os_daemonize_terminate(const char *pid_file) 247 { 248 if (pid_file) 249 unlink(pid_file); 250 } 251 252 253 int os_get_random(unsigned char *buf, size_t len) 254 { 255 FILE *f; 256 size_t rc; 257 258 if (TEST_FAIL()) 259 return -1; 260 261 f = fopen("/dev/urandom", "rb"); 262 if (f == NULL) { 263 printf("Could not open /dev/urandom.\n"); 264 return -1; 265 } 266 267 rc = fread(buf, 1, len, f); 268 fclose(f); 269 270 return rc != len ? -1 : 0; 271 } 272 273 274 unsigned long os_random(void) 275 { 276 return random(); 277 } 278 279 280 char * os_rel2abs_path(const char *rel_path) 281 { 282 char *buf = NULL, *cwd, *ret; 283 size_t len = 128, cwd_len, rel_len, ret_len; 284 int last_errno; 285 286 if (!rel_path) 287 return NULL; 288 289 if (rel_path[0] == '/') 290 return os_strdup(rel_path); 291 292 for (;;) { 293 buf = os_malloc(len); 294 if (buf == NULL) 295 return NULL; 296 cwd = getcwd(buf, len); 297 if (cwd == NULL) { 298 last_errno = errno; 299 os_free(buf); 300 if (last_errno != ERANGE) 301 return NULL; 302 len *= 2; 303 if (len > 2000) 304 return NULL; 305 } else { 306 buf[len - 1] = '\0'; 307 break; 308 } 309 } 310 311 cwd_len = os_strlen(cwd); 312 rel_len = os_strlen(rel_path); 313 ret_len = cwd_len + 1 + rel_len + 1; 314 ret = os_malloc(ret_len); 315 if (ret) { 316 os_memcpy(ret, cwd, cwd_len); 317 ret[cwd_len] = '/'; 318 os_memcpy(ret + cwd_len + 1, rel_path, rel_len); 319 ret[ret_len - 1] = '\0'; 320 } 321 os_free(buf); 322 return ret; 323 } 324 325 326 int os_program_init(void) 327 { 328 #ifdef ANDROID 329 struct __user_cap_header_struct header; 330 struct __user_cap_data_struct cap; 331 struct group *grp = getgrnam("wifi"); 332 gid_t gid_wifi = grp ? grp->gr_gid : 0; 333 struct passwd *pwd = getpwnam("wifi"); 334 uid_t uid_wifi = pwd ? pwd->pw_uid : 0; 335 336 /* 337 * We ignore errors here since errors are normal if we 338 * are already running as non-root. 339 */ 340 #ifdef ANDROID_SETGROUPS_OVERRIDE 341 gid_t groups[] = { ANDROID_SETGROUPS_OVERRIDE }; 342 343 if (!gid_wifi || !uid_wifi) return -1; 344 setgroups(ARRAY_SIZE(groups), groups); 345 #else /* ANDROID_SETGROUPS_OVERRIDE */ 346 gid_t groups[4]; 347 int group_idx = 0; 348 349 if (!gid_wifi || !uid_wifi) return -1; 350 groups[group_idx] = gid_wifi; 351 352 grp = getgrnam("inet"); 353 groups[++group_idx] = grp ? grp->gr_gid : 0; 354 if (!groups[group_idx]) return -1; 355 356 grp = getgrnam("keystore"); 357 groups[++group_idx] = grp ? grp->gr_gid : 0; 358 if (!groups[group_idx]) return -1; 359 360 grp = getgrnam("log"); 361 groups[++group_idx] = grp ? grp->gr_gid : 0; 362 if (!groups[group_idx]) group_idx--; 363 364 setgroups(group_idx + 1, groups); 365 #endif /* ANDROID_SETGROUPS_OVERRIDE */ 366 367 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0); 368 369 setgid(gid_wifi); 370 setuid(uid_wifi); 371 372 header.version = _LINUX_CAPABILITY_VERSION; 373 header.pid = 0; 374 cap.effective = cap.permitted = 375 (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW); 376 cap.inheritable = 0; 377 capset(&header, &cap); 378 #endif /* ANDROID */ 379 380 return 0; 381 } 382 383 384 void os_program_deinit(void) 385 { 386 #ifdef WPA_TRACE 387 struct os_alloc_trace *a; 388 unsigned long total = 0; 389 dl_list_for_each(a, &alloc_list, struct os_alloc_trace, list) { 390 total += a->len; 391 if (a->magic != ALLOC_MAGIC) { 392 wpa_printf(MSG_INFO, "MEMLEAK[%p]: invalid magic 0x%x " 393 "len %lu", 394 a, a->magic, (unsigned long) a->len); 395 continue; 396 } 397 wpa_printf(MSG_INFO, "MEMLEAK[%p]: len %lu", 398 a, (unsigned long) a->len); 399 wpa_trace_dump("memleak", a); 400 } 401 if (total) 402 wpa_printf(MSG_INFO, "MEMLEAK: total %lu bytes", 403 (unsigned long) total); 404 wpa_trace_deinit(); 405 #endif /* WPA_TRACE */ 406 } 407 408 409 int os_setenv(const char *name, const char *value, int overwrite) 410 { 411 return setenv(name, value, overwrite); 412 } 413 414 415 int os_unsetenv(const char *name) 416 { 417 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || \ 418 defined(__OpenBSD__) 419 unsetenv(name); 420 return 0; 421 #else 422 return unsetenv(name); 423 #endif 424 } 425 426 427 char * os_readfile(const char *name, size_t *len) 428 { 429 FILE *f; 430 char *buf; 431 long pos; 432 433 f = fopen(name, "rb"); 434 if (f == NULL) 435 return NULL; 436 437 if (fseek(f, 0, SEEK_END) < 0 || (pos = ftell(f)) < 0) { 438 fclose(f); 439 return NULL; 440 } 441 *len = pos; 442 if (fseek(f, 0, SEEK_SET) < 0) { 443 fclose(f); 444 return NULL; 445 } 446 447 buf = os_malloc(*len); 448 if (buf == NULL) { 449 fclose(f); 450 return NULL; 451 } 452 453 if (fread(buf, 1, *len, f) != *len) { 454 fclose(f); 455 os_free(buf); 456 return NULL; 457 } 458 459 fclose(f); 460 461 return buf; 462 } 463 464 465 int os_file_exists(const char *fname) 466 { 467 return access(fname, F_OK) == 0; 468 } 469 470 471 int os_fdatasync(FILE *stream) 472 { 473 if (!fflush(stream)) { 474 #ifdef __linux__ 475 return fdatasync(fileno(stream)); 476 #else /* !__linux__ */ 477 #ifdef F_FULLFSYNC 478 /* OS X does not implement fdatasync(). */ 479 return fcntl(fileno(stream), F_FULLFSYNC); 480 #else /* F_FULLFSYNC */ 481 return fsync(fileno(stream)); 482 #endif /* F_FULLFSYNC */ 483 #endif /* __linux__ */ 484 } 485 486 return -1; 487 } 488 489 490 #ifndef WPA_TRACE 491 void * os_zalloc(size_t size) 492 { 493 return calloc(1, size); 494 } 495 #endif /* WPA_TRACE */ 496 497 498 size_t os_strlcpy(char *dest, const char *src, size_t siz) 499 { 500 const char *s = src; 501 size_t left = siz; 502 503 if (left) { 504 /* Copy string up to the maximum size of the dest buffer */ 505 while (--left != 0) { 506 if ((*dest++ = *s++) == '\0') 507 break; 508 } 509 } 510 511 if (left == 0) { 512 /* Not enough room for the string; force NUL-termination */ 513 if (siz != 0) 514 *dest = '\0'; 515 while (*s++) 516 ; /* determine total src string length */ 517 } 518 519 return s - src - 1; 520 } 521 522 523 int os_memcmp_const(const void *a, const void *b, size_t len) 524 { 525 const u8 *aa = a; 526 const u8 *bb = b; 527 size_t i; 528 u8 res; 529 530 for (res = 0, i = 0; i < len; i++) 531 res |= aa[i] ^ bb[i]; 532 533 return res; 534 } 535 536 537 void * os_memdup(const void *src, size_t len) 538 { 539 void *r = os_malloc(len); 540 541 if (r) 542 os_memcpy(r, src, len); 543 return r; 544 } 545 546 547 #ifdef WPA_TRACE 548 549 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS) 550 char wpa_trace_fail_func[256] = { 0 }; 551 unsigned int wpa_trace_fail_after; 552 553 static int testing_fail_alloc(void) 554 { 555 const char *func[WPA_TRACE_LEN]; 556 size_t i, res, len; 557 char *pos, *next; 558 int match; 559 560 if (!wpa_trace_fail_after) 561 return 0; 562 563 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 564 i = 0; 565 if (i < res && os_strcmp(func[i], __func__) == 0) 566 i++; 567 if (i < res && os_strcmp(func[i], "os_malloc") == 0) 568 i++; 569 if (i < res && os_strcmp(func[i], "os_zalloc") == 0) 570 i++; 571 if (i < res && os_strcmp(func[i], "os_calloc") == 0) 572 i++; 573 if (i < res && os_strcmp(func[i], "os_realloc") == 0) 574 i++; 575 if (i < res && os_strcmp(func[i], "os_realloc_array") == 0) 576 i++; 577 if (i < res && os_strcmp(func[i], "os_strdup") == 0) 578 i++; 579 if (i < res && os_strcmp(func[i], "os_memdup") == 0) 580 i++; 581 582 pos = wpa_trace_fail_func; 583 584 match = 0; 585 while (i < res) { 586 int allow_skip = 1; 587 int maybe = 0; 588 589 if (*pos == '=') { 590 allow_skip = 0; 591 pos++; 592 } else if (*pos == '?') { 593 maybe = 1; 594 pos++; 595 } 596 next = os_strchr(pos, ';'); 597 if (next) 598 len = next - pos; 599 else 600 len = os_strlen(pos); 601 if (os_memcmp(pos, func[i], len) != 0) { 602 if (maybe && next) { 603 pos = next + 1; 604 continue; 605 } 606 if (allow_skip) { 607 i++; 608 continue; 609 } 610 return 0; 611 } 612 if (!next) { 613 match = 1; 614 break; 615 } 616 pos = next + 1; 617 i++; 618 } 619 if (!match) 620 return 0; 621 622 wpa_trace_fail_after--; 623 if (wpa_trace_fail_after == 0) { 624 wpa_printf(MSG_INFO, "TESTING: fail allocation at %s", 625 wpa_trace_fail_func); 626 for (i = 0; i < res; i++) 627 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 628 (int) i, func[i]); 629 return 1; 630 } 631 632 return 0; 633 } 634 635 636 char wpa_trace_test_fail_func[256] = { 0 }; 637 unsigned int wpa_trace_test_fail_after; 638 639 int testing_test_fail(void) 640 { 641 const char *func[WPA_TRACE_LEN]; 642 size_t i, res, len; 643 char *pos, *next; 644 int match; 645 646 if (!wpa_trace_test_fail_after) 647 return 0; 648 649 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 650 i = 0; 651 if (i < res && os_strcmp(func[i], __func__) == 0) 652 i++; 653 654 pos = wpa_trace_test_fail_func; 655 656 match = 0; 657 while (i < res) { 658 int allow_skip = 1; 659 int maybe = 0; 660 661 if (*pos == '=') { 662 allow_skip = 0; 663 pos++; 664 } else if (*pos == '?') { 665 maybe = 1; 666 pos++; 667 } 668 next = os_strchr(pos, ';'); 669 if (next) 670 len = next - pos; 671 else 672 len = os_strlen(pos); 673 if (os_memcmp(pos, func[i], len) != 0) { 674 if (maybe && next) { 675 pos = next + 1; 676 continue; 677 } 678 if (allow_skip) { 679 i++; 680 continue; 681 } 682 return 0; 683 } 684 if (!next) { 685 match = 1; 686 break; 687 } 688 pos = next + 1; 689 i++; 690 } 691 if (!match) 692 return 0; 693 694 wpa_trace_test_fail_after--; 695 if (wpa_trace_test_fail_after == 0) { 696 wpa_printf(MSG_INFO, "TESTING: fail at %s", 697 wpa_trace_test_fail_func); 698 for (i = 0; i < res; i++) 699 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 700 (int) i, func[i]); 701 return 1; 702 } 703 704 return 0; 705 } 706 707 #else 708 709 static inline int testing_fail_alloc(void) 710 { 711 return 0; 712 } 713 #endif 714 715 void * os_malloc(size_t size) 716 { 717 struct os_alloc_trace *a; 718 719 if (testing_fail_alloc()) 720 return NULL; 721 722 a = malloc(sizeof(*a) + size); 723 if (a == NULL) 724 return NULL; 725 a->magic = ALLOC_MAGIC; 726 dl_list_add(&alloc_list, &a->list); 727 a->len = size; 728 wpa_trace_record(a); 729 return a + 1; 730 } 731 732 733 void * os_realloc(void *ptr, size_t size) 734 { 735 struct os_alloc_trace *a; 736 size_t copy_len; 737 void *n; 738 739 if (ptr == NULL) 740 return os_malloc(size); 741 742 a = (struct os_alloc_trace *) ptr - 1; 743 if (a->magic != ALLOC_MAGIC) { 744 wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s", 745 a, a->magic, 746 a->magic == FREED_MAGIC ? " (already freed)" : ""); 747 wpa_trace_show("Invalid os_realloc() call"); 748 abort(); 749 } 750 n = os_malloc(size); 751 if (n == NULL) 752 return NULL; 753 copy_len = a->len; 754 if (copy_len > size) 755 copy_len = size; 756 os_memcpy(n, a + 1, copy_len); 757 os_free(ptr); 758 return n; 759 } 760 761 762 void os_free(void *ptr) 763 { 764 struct os_alloc_trace *a; 765 766 if (ptr == NULL) 767 return; 768 a = (struct os_alloc_trace *) ptr - 1; 769 if (a->magic != ALLOC_MAGIC) { 770 wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s", 771 a, a->magic, 772 a->magic == FREED_MAGIC ? " (already freed)" : ""); 773 wpa_trace_show("Invalid os_free() call"); 774 abort(); 775 } 776 dl_list_del(&a->list); 777 a->magic = FREED_MAGIC; 778 779 wpa_trace_check_ref(ptr); 780 free(a); 781 } 782 783 784 void * os_zalloc(size_t size) 785 { 786 void *ptr = os_malloc(size); 787 if (ptr) 788 os_memset(ptr, 0, size); 789 return ptr; 790 } 791 792 793 char * os_strdup(const char *s) 794 { 795 size_t len; 796 char *d; 797 len = os_strlen(s); 798 d = os_malloc(len + 1); 799 if (d == NULL) 800 return NULL; 801 os_memcpy(d, s, len); 802 d[len] = '\0'; 803 return d; 804 } 805 806 #endif /* WPA_TRACE */ 807 808 809 int os_exec(const char *program, const char *arg, int wait_completion) 810 { 811 pid_t pid; 812 int pid_status; 813 814 pid = fork(); 815 if (pid < 0) { 816 perror("fork"); 817 return -1; 818 } 819 820 if (pid == 0) { 821 /* run the external command in the child process */ 822 const int MAX_ARG = 30; 823 char *_program, *_arg, *pos; 824 char *argv[MAX_ARG + 1]; 825 int i; 826 827 _program = os_strdup(program); 828 _arg = os_strdup(arg); 829 830 argv[0] = _program; 831 832 i = 1; 833 pos = _arg; 834 while (i < MAX_ARG && pos && *pos) { 835 while (*pos == ' ') 836 pos++; 837 if (*pos == '\0') 838 break; 839 argv[i++] = pos; 840 pos = os_strchr(pos, ' '); 841 if (pos) 842 *pos++ = '\0'; 843 } 844 argv[i] = NULL; 845 846 execv(program, argv); 847 perror("execv"); 848 os_free(_program); 849 os_free(_arg); 850 exit(0); 851 return -1; 852 } 853 854 if (wait_completion) { 855 /* wait for the child process to complete in the parent */ 856 waitpid(pid, &pid_status, 0); 857 } 858 859 return 0; 860 } 861
