1 /* 2 * OS specific functions for UNIX/POSIX systems 3 * Copyright (c) 2005-2009, Jouni Malinen <j@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 #ifndef WPA_TRACE 419 void * os_zalloc(size_t size) 420 { 421 return calloc(1, size); 422 } 423 #endif /* WPA_TRACE */ 424 425 426 size_t os_strlcpy(char *dest, const char *src, size_t siz) 427 { 428 const char *s = src; 429 size_t left = siz; 430 431 if (left) { 432 /* Copy string up to the maximum size of the dest buffer */ 433 while (--left != 0) { 434 if ((*dest++ = *s++) == '\0') 435 break; 436 } 437 } 438 439 if (left == 0) { 440 /* Not enough room for the string; force NUL-termination */ 441 if (siz != 0) 442 *dest = '\0'; 443 while (*s++) 444 ; /* determine total src string length */ 445 } 446 447 return s - src - 1; 448 } 449 450 451 int os_memcmp_const(const void *a, const void *b, size_t len) 452 { 453 const u8 *aa = a; 454 const u8 *bb = b; 455 size_t i; 456 u8 res; 457 458 for (res = 0, i = 0; i < len; i++) 459 res |= aa[i] ^ bb[i]; 460 461 return res; 462 } 463 464 465 #ifdef WPA_TRACE 466 467 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS) 468 char wpa_trace_fail_func[256] = { 0 }; 469 unsigned int wpa_trace_fail_after; 470 471 static int testing_fail_alloc(void) 472 { 473 const char *func[WPA_TRACE_LEN]; 474 size_t i, res, len; 475 char *pos, *next; 476 int match; 477 478 if (!wpa_trace_fail_after) 479 return 0; 480 481 res = wpa_trace_calling_func(func, WPA_TRACE_LEN); 482 i = 0; 483 if (i < res && os_strcmp(func[i], __func__) == 0) 484 i++; 485 if (i < res && os_strcmp(func[i], "os_malloc") == 0) 486 i++; 487 if (i < res && os_strcmp(func[i], "os_zalloc") == 0) 488 i++; 489 if (i < res && os_strcmp(func[i], "os_calloc") == 0) 490 i++; 491 if (i < res && os_strcmp(func[i], "os_realloc") == 0) 492 i++; 493 if (i < res && os_strcmp(func[i], "os_realloc_array") == 0) 494 i++; 495 if (i < res && os_strcmp(func[i], "os_strdup") == 0) 496 i++; 497 498 pos = wpa_trace_fail_func; 499 500 match = 0; 501 while (i < res) { 502 int allow_skip = 1; 503 int maybe = 0; 504 505 if (*pos == '=') { 506 allow_skip = 0; 507 pos++; 508 } else if (*pos == '?') { 509 maybe = 1; 510 pos++; 511 } 512 next = os_strchr(pos, ';'); 513 if (next) 514 len = next - pos; 515 else 516 len = os_strlen(pos); 517 if (os_memcmp(pos, func[i], len) != 0) { 518 if (maybe && next) { 519 pos = next + 1; 520 continue; 521 } 522 if (allow_skip) { 523 i++; 524 continue; 525 } 526 return 0; 527 } 528 if (!next) { 529 match = 1; 530 break; 531 } 532 pos = next + 1; 533 i++; 534 } 535 if (!match) 536 return 0; 537 538 wpa_trace_fail_after--; 539 if (wpa_trace_fail_after == 0) { 540 wpa_printf(MSG_INFO, "TESTING: fail allocation at %s", 541 wpa_trace_fail_func); 542 for (i = 0; i < res; i++) 543 wpa_printf(MSG_INFO, "backtrace[%d] = %s", 544 (int) i, func[i]); 545 return 1; 546 } 547 548 return 0; 549 } 550 551 #else 552 553 static inline int testing_fail_alloc(void) 554 { 555 return 0; 556 } 557 #endif 558 559 void * os_malloc(size_t size) 560 { 561 struct os_alloc_trace *a; 562 563 if (testing_fail_alloc()) 564 return NULL; 565 566 a = malloc(sizeof(*a) + size); 567 if (a == NULL) 568 return NULL; 569 a->magic = ALLOC_MAGIC; 570 dl_list_add(&alloc_list, &a->list); 571 a->len = size; 572 wpa_trace_record(a); 573 return a + 1; 574 } 575 576 577 void * os_realloc(void *ptr, size_t size) 578 { 579 struct os_alloc_trace *a; 580 size_t copy_len; 581 void *n; 582 583 if (ptr == NULL) 584 return os_malloc(size); 585 586 a = (struct os_alloc_trace *) ptr - 1; 587 if (a->magic != ALLOC_MAGIC) { 588 wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s", 589 a, a->magic, 590 a->magic == FREED_MAGIC ? " (already freed)" : ""); 591 wpa_trace_show("Invalid os_realloc() call"); 592 abort(); 593 } 594 n = os_malloc(size); 595 if (n == NULL) 596 return NULL; 597 copy_len = a->len; 598 if (copy_len > size) 599 copy_len = size; 600 os_memcpy(n, a + 1, copy_len); 601 os_free(ptr); 602 return n; 603 } 604 605 606 void os_free(void *ptr) 607 { 608 struct os_alloc_trace *a; 609 610 if (ptr == NULL) 611 return; 612 a = (struct os_alloc_trace *) ptr - 1; 613 if (a->magic != ALLOC_MAGIC) { 614 wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s", 615 a, a->magic, 616 a->magic == FREED_MAGIC ? " (already freed)" : ""); 617 wpa_trace_show("Invalid os_free() call"); 618 abort(); 619 } 620 dl_list_del(&a->list); 621 a->magic = FREED_MAGIC; 622 623 wpa_trace_check_ref(ptr); 624 free(a); 625 } 626 627 628 void * os_zalloc(size_t size) 629 { 630 void *ptr = os_malloc(size); 631 if (ptr) 632 os_memset(ptr, 0, size); 633 return ptr; 634 } 635 636 637 char * os_strdup(const char *s) 638 { 639 size_t len; 640 char *d; 641 len = os_strlen(s); 642 d = os_malloc(len + 1); 643 if (d == NULL) 644 return NULL; 645 os_memcpy(d, s, len); 646 d[len] = '\0'; 647 return d; 648 } 649 650 #endif /* WPA_TRACE */ 651 652 653 int os_exec(const char *program, const char *arg, int wait_completion) 654 { 655 pid_t pid; 656 int pid_status; 657 658 pid = fork(); 659 if (pid < 0) { 660 perror("fork"); 661 return -1; 662 } 663 664 if (pid == 0) { 665 /* run the external command in the child process */ 666 #define MAX_ARG 30 667 char *_program, *_arg, *pos; 668 char *argv[MAX_ARG + 1]; 669 int i; 670 671 _program = os_strdup(program); 672 _arg = os_strdup(arg); 673 674 argv[0] = _program; 675 676 i = 1; 677 pos = _arg; 678 while (i < MAX_ARG && pos && *pos) { 679 while (*pos == ' ') 680 pos++; 681 if (*pos == '\0') 682 break; 683 argv[i++] = pos; 684 pos = os_strchr(pos, ' '); 685 if (pos) 686 *pos++ = '\0'; 687 } 688 argv[i] = NULL; 689 690 execv(program, argv); 691 perror("execv"); 692 os_free(_program); 693 os_free(_arg); 694 exit(0); 695 return -1; 696 } 697 698 if (wait_completion) { 699 /* wait for the child process to complete in the parent */ 700 waitpid(pid, &pid_status, 0); 701 } 702 703 return 0; 704 } 705