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 #else /* ANDROID_SETGROUPS_OVERRIDE */ 345 gid_t groups[3]; 346 347 if (!gid_wifi || !uid_wifi) return -1; 348 groups[0] = gid_wifi; 349 350 grp = getgrnam("inet"); 351 groups[1] = grp ? grp->gr_gid : 0; 352 if (!groups[1]) return -1; 353 354 grp = getgrnam("keystore"); 355 groups[2] = grp ? grp->gr_gid : 0; 356 if (!groups[2]) return -1; 357 #endif /* ANDROID_SETGROUPS_OVERRIDE */ 358 359 setgroups(ARRAY_SIZE(groups), groups); 360 361 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0); 362 363 setgid(gid_wifi); 364 setuid(uid_wifi); 365 366 header.version = _LINUX_CAPABILITY_VERSION; 367 header.pid = 0; 368 cap.effective = cap.permitted = 369 (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW); 370 cap.inheritable = 0; 371 capset(&header, &cap); 372 #endif /* ANDROID */ 373 374 return 0; 375 } 376 377 378 void os_program_deinit(void) 379 { 380 #ifdef WPA_TRACE 381 struct os_alloc_trace *a; 382 unsigned long total = 0; 383 dl_list_for_each(a, &alloc_list, struct os_alloc_trace, list) { 384 total += a->len; 385 if (a->magic != ALLOC_MAGIC) { 386 wpa_printf(MSG_INFO, "MEMLEAK[%p]: invalid magic 0x%x " 387 "len %lu", 388 a, a->magic, (unsigned long) a->len); 389 continue; 390 } 391 wpa_printf(MSG_INFO, "MEMLEAK[%p]: len %lu", 392 a, (unsigned long) a->len); 393 wpa_trace_dump("memleak", a); 394 } 395 if (total) 396 wpa_printf(MSG_INFO, "MEMLEAK: total %lu bytes", 397 (unsigned long) total); 398 wpa_trace_deinit(); 399 #endif /* WPA_TRACE */ 400 } 401 402 403 int os_setenv(const char *name, const char *value, int overwrite) 404 { 405 return setenv(name, value, overwrite); 406 } 407 408 409 int os_unsetenv(const char *name) 410 { 411 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || \ 412 defined(__OpenBSD__) 413 unsetenv(name); 414 return 0; 415 #else 416 return unsetenv(name); 417 #endif 418 } 419 420 421 char * os_readfile(const char *name, size_t *len) 422 { 423 FILE *f; 424 char *buf; 425 long pos; 426 427 f = fopen(name, "rb"); 428 if (f == NULL) 429 return NULL; 430 431 if (fseek(f, 0, SEEK_END) < 0 || (pos = ftell(f)) < 0) { 432 fclose(f); 433 return NULL; 434 } 435 *len = pos; 436 if (fseek(f, 0, SEEK_SET) < 0) { 437 fclose(f); 438 return NULL; 439 } 440 441 buf = os_malloc(*len); 442 if (buf == NULL) { 443 fclose(f); 444 return NULL; 445 } 446 447 if (fread(buf, 1, *len, f) != *len) { 448 fclose(f); 449 os_free(buf); 450 return NULL; 451 } 452 453 fclose(f); 454 455 return buf; 456 } 457 458 459 int os_file_exists(const char *fname) 460 { 461 return access(fname, F_OK) == 0; 462 } 463 464 465 int os_fdatasync(FILE *stream) 466 { 467 if (!fflush(stream)) { 468 #ifdef __linux__ 469 return fdatasync(fileno(stream)); 470 #else /* !__linux__ */ 471 #ifdef F_FULLFSYNC 472 /* OS X does not implement fdatasync(). */ 473 return fcntl(fileno(stream), F_FULLFSYNC); 474 #else /* F_FULLFSYNC */ 475 return fsync(fileno(stream)); 476 #endif /* F_FULLFSYNC */ 477 #endif /* __linux__ */ 478 } 479 480 return -1; 481 } 482 483 484 #ifndef WPA_TRACE 485 void * os_zalloc(size_t size) 486 { 487 return calloc(1, size); 488 } 489 #endif /* WPA_TRACE */ 490 491 492 size_t os_strlcpy(char *dest, const char *src, size_t siz) 493 { 494 const char *s = src; 495 size_t left = siz; 496 497 if (left) { 498 /* Copy string up to the maximum size of the dest buffer */ 499 while (--left != 0) { 500 if ((*dest++ = *s++) == '\0') 501 break; 502 } 503 } 504 505 if (left == 0) { 506 /* Not enough room for the string; force NUL-termination */ 507 if (siz != 0) 508 *dest = '\0'; 509 while (*s++) 510 ; /* determine total src string length */ 511 } 512 513 return s - src - 1; 514 } 515 516 517 int os_memcmp_const(const void *a, const void *b, size_t len) 518 { 519 const u8 *aa = a; 520 const u8 *bb = b; 521 size_t i; 522 u8 res; 523 524 for (res = 0, i = 0; i < len; i++) 525 res |= aa[i] ^ bb[i]; 526 527 return res; 528 } 529 530 531 #ifdef WPA_TRACE 532 533 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS) 534 char wpa_trace_fail_func[256] = { 0 }; 535 unsigned int wpa_trace_fail_after; 536 537 static int testing_fail_alloc(void) 538 { 539 const char *func[WPA_TRACE_LEN]; 540 size_t i, res, len; 541 char *pos, *next; 542 int match; 543 544 if (!wpa_trace_fail_after) 545 return 0; 546 547 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 548 i = 0; 549 if (i < res && os_strcmp(func[i], __func__) == 0) 550 i++; 551 if (i < res && os_strcmp(func[i], "os_malloc") == 0) 552 i++; 553 if (i < res && os_strcmp(func[i], "os_zalloc") == 0) 554 i++; 555 if (i < res && os_strcmp(func[i], "os_calloc") == 0) 556 i++; 557 if (i < res && os_strcmp(func[i], "os_realloc") == 0) 558 i++; 559 if (i < res && os_strcmp(func[i], "os_realloc_array") == 0) 560 i++; 561 if (i < res && os_strcmp(func[i], "os_strdup") == 0) 562 i++; 563 564 pos = wpa_trace_fail_func; 565 566 match = 0; 567 while (i < res) { 568 int allow_skip = 1; 569 int maybe = 0; 570 571 if (*pos == '=') { 572 allow_skip = 0; 573 pos++; 574 } else if (*pos == '?') { 575 maybe = 1; 576 pos++; 577 } 578 next = os_strchr(pos, ';'); 579 if (next) 580 len = next - pos; 581 else 582 len = os_strlen(pos); 583 if (os_memcmp(pos, func[i], len) != 0) { 584 if (maybe && next) { 585 pos = next + 1; 586 continue; 587 } 588 if (allow_skip) { 589 i++; 590 continue; 591 } 592 return 0; 593 } 594 if (!next) { 595 match = 1; 596 break; 597 } 598 pos = next + 1; 599 i++; 600 } 601 if (!match) 602 return 0; 603 604 wpa_trace_fail_after--; 605 if (wpa_trace_fail_after == 0) { 606 wpa_printf(MSG_INFO, "TESTING: fail allocation at %s", 607 wpa_trace_fail_func); 608 for (i = 0; i < res; i++) 609 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 610 (int) i, func[i]); 611 return 1; 612 } 613 614 return 0; 615 } 616 617 618 char wpa_trace_test_fail_func[256] = { 0 }; 619 unsigned int wpa_trace_test_fail_after; 620 621 int testing_test_fail(void) 622 { 623 const char *func[WPA_TRACE_LEN]; 624 size_t i, res, len; 625 char *pos, *next; 626 int match; 627 628 if (!wpa_trace_test_fail_after) 629 return 0; 630 631 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 632 i = 0; 633 if (i < res && os_strcmp(func[i], __func__) == 0) 634 i++; 635 636 pos = wpa_trace_test_fail_func; 637 638 match = 0; 639 while (i < res) { 640 int allow_skip = 1; 641 int maybe = 0; 642 643 if (*pos == '=') { 644 allow_skip = 0; 645 pos++; 646 } else if (*pos == '?') { 647 maybe = 1; 648 pos++; 649 } 650 next = os_strchr(pos, ';'); 651 if (next) 652 len = next - pos; 653 else 654 len = os_strlen(pos); 655 if (os_memcmp(pos, func[i], len) != 0) { 656 if (maybe && next) { 657 pos = next + 1; 658 continue; 659 } 660 if (allow_skip) { 661 i++; 662 continue; 663 } 664 return 0; 665 } 666 if (!next) { 667 match = 1; 668 break; 669 } 670 pos = next + 1; 671 i++; 672 } 673 if (!match) 674 return 0; 675 676 wpa_trace_test_fail_after--; 677 if (wpa_trace_test_fail_after == 0) { 678 wpa_printf(MSG_INFO, "TESTING: fail at %s", 679 wpa_trace_test_fail_func); 680 for (i = 0; i < res; i++) 681 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 682 (int) i, func[i]); 683 return 1; 684 } 685 686 return 0; 687 } 688 689 #else 690 691 static inline int testing_fail_alloc(void) 692 { 693 return 0; 694 } 695 #endif 696 697 void * os_malloc(size_t size) 698 { 699 struct os_alloc_trace *a; 700 701 if (testing_fail_alloc()) 702 return NULL; 703 704 a = malloc(sizeof(*a) + size); 705 if (a == NULL) 706 return NULL; 707 a->magic = ALLOC_MAGIC; 708 dl_list_add(&alloc_list, &a->list); 709 a->len = size; 710 wpa_trace_record(a); 711 return a + 1; 712 } 713 714 715 void * os_realloc(void *ptr, size_t size) 716 { 717 struct os_alloc_trace *a; 718 size_t copy_len; 719 void *n; 720 721 if (ptr == NULL) 722 return os_malloc(size); 723 724 a = (struct os_alloc_trace *) ptr - 1; 725 if (a->magic != ALLOC_MAGIC) { 726 wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s", 727 a, a->magic, 728 a->magic == FREED_MAGIC ? " (already freed)" : ""); 729 wpa_trace_show("Invalid os_realloc() call"); 730 abort(); 731 } 732 n = os_malloc(size); 733 if (n == NULL) 734 return NULL; 735 copy_len = a->len; 736 if (copy_len > size) 737 copy_len = size; 738 os_memcpy(n, a + 1, copy_len); 739 os_free(ptr); 740 return n; 741 } 742 743 744 void os_free(void *ptr) 745 { 746 struct os_alloc_trace *a; 747 748 if (ptr == NULL) 749 return; 750 a = (struct os_alloc_trace *) ptr - 1; 751 if (a->magic != ALLOC_MAGIC) { 752 wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s", 753 a, a->magic, 754 a->magic == FREED_MAGIC ? " (already freed)" : ""); 755 wpa_trace_show("Invalid os_free() call"); 756 abort(); 757 } 758 dl_list_del(&a->list); 759 a->magic = FREED_MAGIC; 760 761 wpa_trace_check_ref(ptr); 762 free(a); 763 } 764 765 766 void * os_zalloc(size_t size) 767 { 768 void *ptr = os_malloc(size); 769 if (ptr) 770 os_memset(ptr, 0, size); 771 return ptr; 772 } 773 774 775 char * os_strdup(const char *s) 776 { 777 size_t len; 778 char *d; 779 len = os_strlen(s); 780 d = os_malloc(len + 1); 781 if (d == NULL) 782 return NULL; 783 os_memcpy(d, s, len); 784 d[len] = '\0'; 785 return d; 786 } 787 788 #endif /* WPA_TRACE */ 789 790 791 int os_exec(const char *program, const char *arg, int wait_completion) 792 { 793 pid_t pid; 794 int pid_status; 795 796 pid = fork(); 797 if (pid < 0) { 798 perror("fork"); 799 return -1; 800 } 801 802 if (pid == 0) { 803 /* run the external command in the child process */ 804 const int MAX_ARG = 30; 805 char *_program, *_arg, *pos; 806 char *argv[MAX_ARG + 1]; 807 int i; 808 809 _program = os_strdup(program); 810 _arg = os_strdup(arg); 811 812 argv[0] = _program; 813 814 i = 1; 815 pos = _arg; 816 while (i < MAX_ARG && pos && *pos) { 817 while (*pos == ' ') 818 pos++; 819 if (*pos == '\0') 820 break; 821 argv[i++] = pos; 822 pos = os_strchr(pos, ' '); 823 if (pos) 824 *pos++ = '\0'; 825 } 826 argv[i] = NULL; 827 828 execv(program, argv); 829 perror("execv"); 830 os_free(_program); 831 os_free(_arg); 832 exit(0); 833 return -1; 834 } 835 836 if (wait_completion) { 837 /* wait for the child process to complete in the parent */ 838 waitpid(pid, &pid_status, 0); 839 } 840 841 return 0; 842 } 843
