src/utils/os_internal.c

   1 /*
   2  * wpa_supplicant/hostapd / Internal implementation of OS specific functions
   3  * Copyright (c) 2005-2006, 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  * This file is an example of operating system specific  wrapper functions.
   9  * This version implements many of the functions internally, so it can be used
  10  * to fill in missing functions from the target system C libraries.
  11  *
  12  * Some of the functions are using standard C library calls in order to keep
  13  * this file in working condition to allow the functions to be tested on a
  14  * Linux target. Please note that OS_NO_C_LIB_DEFINES needs to be defined for
  15  * this file to work correctly. Note that these implementations are only
  16  * examples and are not optimized for speed.
  17  */
  18
  19 #include "includes.h"
  20 #include <time.h>
  21 #include <sys/wait.h>
  22
  23 #undef OS_REJECT_C_LIB_FUNCTIONS
  24 #include "common.h"
  25
  26 void os_sleep(os_time_t sec, os_time_t usec)
  27 {
  28         if (sec)
  29                 sleep(sec);
  30         if (usec)
  31                 usleep(usec);
  32 }
  33
  34
  35 int os_get_time(struct os_time *t)
  36 {
  37         int res;
  38         struct timeval tv;
  39         res = gettimeofday(&tv, NULL);
  40         t->sec = tv.tv_sec;
  41         t->usec = tv.tv_usec;
  42         return res;
  43 }
  44
  45
  46 int os_get_reltime(struct os_reltime *t)
  47 {
  48         int res;
  49         struct timeval tv;
  50         res = gettimeofday(&tv, NULL);
  51         t->sec = tv.tv_sec;
  52         t->usec = tv.tv_usec;
  53         return res;
  54 }
  55
  56
  57 int os_mktime(int year, int month, int day, int hour, int min, int sec,
  58               os_time_t *t)
  59 {
  60         struct tm tm;
  61
  62         if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 ||
  63             hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 ||
  64             sec > 60)
  65                 return -1;
  66
  67         os_memset(&tm, 0, sizeof(tm));
  68         tm.tm_year = year - 1900;
  69         tm.tm_mon = month - 1;
  70         tm.tm_mday = day;
  71         tm.tm_hour = hour;
  72         tm.tm_min = min;
  73         tm.tm_sec = sec;
  74
  75         *t = (os_time_t) mktime(&tm);
  76         return 0;
  77 }
  78
  79
  80 int os_gmtime(os_time_t t, struct os_tm *tm)
  81 {
  82         struct tm *tm2;
  83         time_t t2 = t;
  84
  85         tm2 = gmtime(&t2);
  86         if (tm2 == NULL)
  87                 return -1;
  88         tm->sec = tm2->tm_sec;
  89         tm->min = tm2->tm_min;
  90         tm->hour = tm2->tm_hour;
  91         tm->day = tm2->tm_mday;
  92         tm->month = tm2->tm_mon + 1;
  93         tm->year = tm2->tm_year + 1900;
  94         return 0;
  95 }
  96
  97
  98 int os_daemonize(const char *pid_file)
  99 {
 100         if (daemon(0, 0)) {
 101                 perror("daemon");
 102                 return -1;
 103         }
 104
 105         if (pid_file) {
 106                 FILE *f = fopen(pid_file, "w");
 107                 if (f) {
 108                         fprintf(f, "%u\n", getpid());
 109                         fclose(f);
 110                 }
 111         }
 112
 113         return -0;
 114 }
 115
 116
 117 void os_daemonize_terminate(const char *pid_file)
 118 {
 119         if (pid_file)
 120                 unlink(pid_file);
 121 }
 122
 123
 124 int os_get_random(unsigned char *buf, size_t len)
 125 {
 126         FILE *f;
 127         size_t rc;
 128
 129         f = fopen("/dev/urandom", "rb");
 130         if (f == NULL) {
 131                 printf("Could not open /dev/urandom.\n");
 132                 return -1;
 133         }
 134
 135         rc = fread(buf, 1, len, f);
 136         fclose(f);
 137
 138         return rc != len ? -1 : 0;
 139 }
 140
 141
 142 unsigned long os_random(void)
 143 {
 144         return random();
 145 }
 146
 147
 148 char * os_rel2abs_path(const char *rel_path)
 149 {
 150         char *buf = NULL, *cwd, *ret;
 151         size_t len = 128, cwd_len, rel_len, ret_len;
 152
 153         if (rel_path[0] == '/')
 154                 return os_strdup(rel_path);
 155
 156         for (;;) {
 157                 buf = os_malloc(len);
 158                 if (buf == NULL)
 159                         return NULL;
 160                 cwd = getcwd(buf, len);
 161                 if (cwd == NULL) {
 162                         os_free(buf);
 163                         if (errno != ERANGE) {
 164                                 return NULL;
 165                         }
 166                         len *= 2;
 167                 } else {
 168                         break;
 169                 }
 170         }
 171
 172         cwd_len = os_strlen(cwd);
 173         rel_len = os_strlen(rel_path);
 174         ret_len = cwd_len + 1 + rel_len + 1;
 175         ret = os_malloc(ret_len);
 176         if (ret) {
 177                 os_memcpy(ret, cwd, cwd_len);
 178                 ret[cwd_len] = '/';
 179                 os_memcpy(ret + cwd_len + 1, rel_path, rel_len);
 180                 ret[ret_len - 1] = '\0';
 181         }
 182         os_free(buf);
 183         return ret;
 184 }
 185
 186
 187 int os_program_init(void)
 188 {
 189         return 0;
 190 }
 191
 192
 193 void os_program_deinit(void)
 194 {
 195 }
 196
 197
 198 int os_setenv(const char *name, const char *value, int overwrite)
 199 {
 200         return setenv(name, value, overwrite);
 201 }
 202
 203
 204 int os_unsetenv(const char *name)
 205 {
 206 #if defined(__FreeBSD__) || defined(__NetBSD__)
 207         unsetenv(name);
 208         return 0;
 209 #else
 210         return unsetenv(name);
 211 #endif
 212 }
 213
 214
 215 char * os_readfile(const char *name, size_t *len)
 216 {
 217         FILE *f;
 218         char *buf;
 219
 220         f = fopen(name, "rb");
 221         if (f == NULL)
 222                 return NULL;
 223
 224         fseek(f, 0, SEEK_END);
 225         *len = ftell(f);
 226         fseek(f, 0, SEEK_SET);
 227
 228         buf = os_malloc(*len);
 229         if (buf == NULL) {
 230                 fclose(f);
 231                 return NULL;
 232         }
 233
 234         if (fread(buf, 1, *len, f) != *len) {
 235                 fclose(f);
 236                 os_free(buf);
 237                 return NULL;
 238         }
 239
 240         fclose(f);
 241
 242         return buf;
 243 }
 244
 245
 246 void * os_zalloc(size_t size)
 247 {
 248         void *n = os_malloc(size);
 249         if (n)
 250                 os_memset(n, 0, size);
 251         return n;
 252 }
 253
 254
 255 void * os_malloc(size_t size)
 256 {
 257         return malloc(size);
 258 }
 259
 260
 261 void * os_realloc(void *ptr, size_t size)
 262 {
 263         return realloc(ptr, size);
 264 }
 265
 266
 267 void os_free(void *ptr)
 268 {
 269         free(ptr);
 270 }
 271
 272
 273 void * os_memcpy(void *dest, const void *src, size_t n)
 274 {
 275         char *d = dest;
 276         const char *s = src;
 277         while (n--)
 278                 *d++ = *s++;
 279         return dest;
 280 }
 281
 282
 283 void * os_memmove(void *dest, const void *src, size_t n)
 284 {
 285         if (dest < src)
 286                 os_memcpy(dest, src, n);
 287         else {
 288                 /* overlapping areas */
 289                 char *d = (char *) dest + n;
 290                 const char *s = (const char *) src + n;
 291                 while (n--)
 292                         *--d = *--s;
 293         }
 294         return dest;
 295 }
 296
 297
 298 void * os_memset(void *s, int c, size_t n)
 299 {
 300         char *p = s;
 301         while (n--)
 302                 *p++ = c;
 303         return s;
 304 }
 305
 306
 307 int os_memcmp(const void *s1, const void *s2, size_t n)
 308 {
 309         const unsigned char *p1 = s1, *p2 = s2;
 310
 311         if (n == 0)
 312                 return 0;
 313
 314         while (*p1 == *p2) {
 315                 p1++;
 316                 p2++;
 317                 n--;
 318                 if (n == 0)
 319                         return 0;
 320         }
 321
 322         return *p1 - *p2;
 323 }
 324
 325
 326 char * os_strdup(const char *s)
 327 {
 328         char *res;
 329         size_t len;
 330         if (s == NULL)
 331                 return NULL;
 332         len = os_strlen(s);
 333         res = os_malloc(len + 1);
 334         if (res)
 335                 os_memcpy(res, s, len + 1);
 336         return res;
 337 }
 338
 339
 340 size_t os_strlen(const char *s)
 341 {
 342         const char *p = s;
 343         while (*p)
 344                 p++;
 345         return p - s;
 346 }
 347
 348
 349 int os_strcasecmp(const char *s1, const char *s2)
 350 {
 351         /*
 352          * Ignoring case is not required for main functionality, so just use
 353          * the case sensitive version of the function.
 354          */
 355         return os_strcmp(s1, s2);
 356 }
 357
 358
 359 int os_strncasecmp(const char *s1, const char *s2, size_t n)
 360 {
 361         /*
 362          * Ignoring case is not required for main functionality, so just use
 363          * the case sensitive version of the function.
 364          */
 365         return os_strncmp(s1, s2, n);
 366 }
 367
 368
 369 char * os_strchr(const char *s, int c)
 370 {
 371         while (*s) {
 372                 if (*s == c)
 373                         return (char *) s;
 374                 s++;
 375         }
 376         return NULL;
 377 }
 378
 379
 380 char * os_strrchr(const char *s, int c)
 381 {
 382         const char *p = s;
 383         while (*p)
 384                 p++;
 385         p--;
 386         while (p >= s) {
 387                 if (*p == c)
 388                         return (char *) p;
 389                 p--;
 390         }
 391         return NULL;
 392 }
 393
 394
 395 int os_strcmp(const char *s1, const char *s2)
 396 {
 397         while (*s1 == *s2) {
 398                 if (*s1 == '\0')
 399                         break;
 400                 s1++;
 401                 s2++;
 402         }
 403
 404         return *s1 - *s2;
 405 }
 406
 407
 408 int os_strncmp(const char *s1, const char *s2, size_t n)
 409 {
 410         if (n == 0)
 411                 return 0;
 412
 413         while (*s1 == *s2) {
 414                 if (*s1 == '\0')
 415                         break;
 416                 s1++;
 417                 s2++;
 418                 n--;
 419                 if (n == 0)
 420                         return 0;
 421         }
 422
 423         return *s1 - *s2;
 424 }
 425
 426
 427 char * os_strncpy(char *dest, const char *src, size_t n)
 428 {
 429         char *d = dest;
 430
 431         while (n--) {
 432                 *d = *src;
 433                 if (*src == '\0')
 434                         break;
 435                 d++;
 436                 src++;
 437         }
 438
 439         return dest;
 440 }
 441
 442
 443 size_t os_strlcpy(char *dest, const char *src, size_t siz)
 444 {
 445         const char *s = src;
 446         size_t left = siz;
 447
 448         if (left) {
 449                 /* Copy string up to the maximum size of the dest buffer */
 450                 while (--left != 0) {
 451                         if ((*dest++ = *s++) == '\0')
 452                                 break;
 453                 }
 454         }
 455
 456         if (left == 0) {
 457                 /* Not enough room for the string; force NUL-termination */
 458                 if (siz != 0)
 459                         *dest = '\0';
 460                 while (*s++)
 461                         ; /* determine total src string length */
 462         }
 463
 464         return s - src - 1;
 465 }
 466
 467
 468 int os_memcmp_const(const void *a, const void *b, size_t len)
 469 {
 470         const u8 *aa = a;
 471         const u8 *bb = b;
 472         size_t i;
 473         u8 res;
 474
 475         for (res = 0, i = 0; i < len; i++)
 476                 res |= aa[i] ^ bb[i];
 477
 478         return res;
 479 }
 480
 481
 482 char * os_strstr(const char *haystack, const char *needle)
 483 {
 484         size_t len = os_strlen(needle);
 485         while (*haystack) {
 486                 if (os_strncmp(haystack, needle, len) == 0)
 487                         return (char *) haystack;
 488                 haystack++;
 489         }
 490
 491         return NULL;
 492 }
 493
 494
 495 int os_snprintf(char *str, size_t size, const char *format, ...)
 496 {
 497         va_list ap;
 498         int ret;
 499
 500         /* See http://www.ijs.si/software/snprintf/ for portable
 501          * implementation of snprintf.
 502          */
 503
 504         va_start(ap, format);
 505         ret = vsnprintf(str, size, format, ap);
 506         va_end(ap);
 507         if (size > 0)
 508                 str[size - 1] = '\0';
 509         return ret;
 510 }
 511
 512
 513 int os_exec(const char *program, const char *arg, int wait_completion)
 514 {
 515         pid_t pid;
 516         int pid_status;
 517
 518         pid = fork();
 519         if (pid < 0) {
 520                 wpa_printf(MSG_ERROR, "fork: %s", strerror(errno));
 521                 return -1;
 522         }
 523
 524         if (pid == 0) {
 525                 /* run the external command in the child process */
 526                 const int MAX_ARG = 30;
 527                 char *_program, *_arg, *pos;
 528                 char *argv[MAX_ARG + 1];
 529                 int i;
 530
 531                 _program = os_strdup(program);
 532                 _arg = os_strdup(arg);
 533
 534                 argv[0] = _program;
 535
 536                 i = 1;
 537                 pos = _arg;
 538                 while (i < MAX_ARG && pos && *pos) {
 539                         while (*pos == ' ')
 540                                 pos++;
 541                         if (*pos == '\0')
 542                                 break;
 543                         argv[i++] = pos;
 544                         pos = os_strchr(pos, ' ');
 545                         if (pos)
 546                                 *pos++ = '\0';
 547                 }
 548                 argv[i] = NULL;
 549
 550                 execv(program, argv);
 551                 wpa_printf(MSG_ERROR, "execv: %s", strerror(errno));
 552                 os_free(_program);
 553                 os_free(_arg);
 554                 exit(0);
 555                 return -1;
 556         }
 557
 558         if (wait_completion) {
 559                 /* wait for the child process to complete in the parent */
 560                 waitpid(pid, &pid_status, 0);
 561         }
 562
 563         return 0;
 564 }