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      1 /*
      2  * OS specific functions
      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 #ifndef OS_H
     10 #define OS_H
     11 
     12 typedef long os_time_t;
     13 
     14 /**
     15  * os_sleep - Sleep (sec, usec)
     16  * @sec: Number of seconds to sleep
     17  * @usec: Number of microseconds to sleep
     18  */
     19 void os_sleep(os_time_t sec, os_time_t usec);
     20 
     21 struct os_time {
     22 	os_time_t sec;
     23 	os_time_t usec;
     24 };
     25 
     26 struct os_reltime {
     27 	os_time_t sec;
     28 	os_time_t usec;
     29 };
     30 
     31 /**
     32  * os_get_time - Get current time (sec, usec)
     33  * @t: Pointer to buffer for the time
     34  * Returns: 0 on success, -1 on failure
     35  */
     36 int os_get_time(struct os_time *t);
     37 
     38 /**
     39  * os_get_reltime - Get relative time (sec, usec)
     40  * @t: Pointer to buffer for the time
     41  * Returns: 0 on success, -1 on failure
     42  */
     43 int os_get_reltime(struct os_reltime *t);
     44 
     45 
     46 /* Helpers for handling struct os_time */
     47 
     48 static inline int os_time_before(struct os_time *a, struct os_time *b)
     49 {
     50 	return (a->sec < b->sec) ||
     51 	       (a->sec == b->sec && a->usec < b->usec);
     52 }
     53 
     54 
     55 static inline void os_time_sub(struct os_time *a, struct os_time *b,
     56 			       struct os_time *res)
     57 {
     58 	res->sec = a->sec - b->sec;
     59 	res->usec = a->usec - b->usec;
     60 	if (res->usec < 0) {
     61 		res->sec--;
     62 		res->usec += 1000000;
     63 	}
     64 }
     65 
     66 
     67 /* Helpers for handling struct os_reltime */
     68 
     69 static inline int os_reltime_before(struct os_reltime *a,
     70 				    struct os_reltime *b)
     71 {
     72 	return (a->sec < b->sec) ||
     73 	       (a->sec == b->sec && a->usec < b->usec);
     74 }
     75 
     76 
     77 static inline void os_reltime_sub(struct os_reltime *a, struct os_reltime *b,
     78 				  struct os_reltime *res)
     79 {
     80 	res->sec = a->sec - b->sec;
     81 	res->usec = a->usec - b->usec;
     82 	if (res->usec < 0) {
     83 		res->sec--;
     84 		res->usec += 1000000;
     85 	}
     86 }
     87 
     88 
     89 static inline void os_reltime_age(struct os_reltime *start,
     90 				  struct os_reltime *age)
     91 {
     92 	struct os_reltime now;
     93 
     94 	os_get_reltime(&now);
     95 	os_reltime_sub(&now, start, age);
     96 }
     97 
     98 
     99 static inline int os_reltime_expired(struct os_reltime *now,
    100 				     struct os_reltime *ts,
    101 				     os_time_t timeout_secs)
    102 {
    103 	struct os_reltime age;
    104 
    105 	os_reltime_sub(now, ts, &age);
    106 	return (age.sec > timeout_secs) ||
    107 	       (age.sec == timeout_secs && age.usec > 0);
    108 }
    109 
    110 
    111 static inline int os_reltime_initialized(struct os_reltime *t)
    112 {
    113 	return t->sec != 0 || t->usec != 0;
    114 }
    115 
    116 
    117 /**
    118  * os_mktime - Convert broken-down time into seconds since 1970-01-01
    119  * @year: Four digit year
    120  * @month: Month (1 .. 12)
    121  * @day: Day of month (1 .. 31)
    122  * @hour: Hour (0 .. 23)
    123  * @min: Minute (0 .. 59)
    124  * @sec: Second (0 .. 60)
    125  * @t: Buffer for returning calendar time representation (seconds since
    126  * 1970-01-01 00:00:00)
    127  * Returns: 0 on success, -1 on failure
    128  *
    129  * Note: The result is in seconds from Epoch, i.e., in UTC, not in local time
    130  * which is used by POSIX mktime().
    131  */
    132 int os_mktime(int year, int month, int day, int hour, int min, int sec,
    133 	      os_time_t *t);
    134 
    135 struct os_tm {
    136 	int sec; /* 0..59 or 60 for leap seconds */
    137 	int min; /* 0..59 */
    138 	int hour; /* 0..23 */
    139 	int day; /* 1..31 */
    140 	int month; /* 1..12 */
    141 	int year; /* Four digit year */
    142 };
    143 
    144 int os_gmtime(os_time_t t, struct os_tm *tm);
    145 
    146 /**
    147  * os_daemonize - Run in the background (detach from the controlling terminal)
    148  * @pid_file: File name to write the process ID to or %NULL to skip this
    149  * Returns: 0 on success, -1 on failure
    150  */
    151 int os_daemonize(const char *pid_file);
    152 
    153 /**
    154  * os_daemonize_terminate - Stop running in the background (remove pid file)
    155  * @pid_file: File name to write the process ID to or %NULL to skip this
    156  */
    157 void os_daemonize_terminate(const char *pid_file);
    158 
    159 /**
    160  * os_get_random - Get cryptographically strong pseudo random data
    161  * @buf: Buffer for pseudo random data
    162  * @len: Length of the buffer
    163  * Returns: 0 on success, -1 on failure
    164  */
    165 int os_get_random(unsigned char *buf, size_t len);
    166 
    167 /**
    168  * os_random - Get pseudo random value (not necessarily very strong)
    169  * Returns: Pseudo random value
    170  */
    171 unsigned long os_random(void);
    172 
    173 /**
    174  * os_rel2abs_path - Get an absolute path for a file
    175  * @rel_path: Relative path to a file
    176  * Returns: Absolute path for the file or %NULL on failure
    177  *
    178  * This function tries to convert a relative path of a file to an absolute path
    179  * in order for the file to be found even if current working directory has
    180  * changed. The returned value is allocated and caller is responsible for
    181  * freeing it. It is acceptable to just return the same path in an allocated
    182  * buffer, e.g., return strdup(rel_path). This function is only used to find
    183  * configuration files when os_daemonize() may have changed the current working
    184  * directory and relative path would be pointing to a different location.
    185  */
    186 char * os_rel2abs_path(const char *rel_path);
    187 
    188 /**
    189  * os_program_init - Program initialization (called at start)
    190  * Returns: 0 on success, -1 on failure
    191  *
    192  * This function is called when a programs starts. If there are any OS specific
    193  * processing that is needed, it can be placed here. It is also acceptable to
    194  * just return 0 if not special processing is needed.
    195  */
    196 int os_program_init(void);
    197 
    198 /**
    199  * os_program_deinit - Program deinitialization (called just before exit)
    200  *
    201  * This function is called just before a program exists. If there are any OS
    202  * specific processing, e.g., freeing resourced allocated in os_program_init(),
    203  * it should be done here. It is also acceptable for this function to do
    204  * nothing.
    205  */
    206 void os_program_deinit(void);
    207 
    208 /**
    209  * os_setenv - Set environment variable
    210  * @name: Name of the variable
    211  * @value: Value to set to the variable
    212  * @overwrite: Whether existing variable should be overwritten
    213  * Returns: 0 on success, -1 on error
    214  *
    215  * This function is only used for wpa_cli action scripts. OS wrapper does not
    216  * need to implement this if such functionality is not needed.
    217  */
    218 int os_setenv(const char *name, const char *value, int overwrite);
    219 
    220 /**
    221  * os_unsetenv - Delete environent variable
    222  * @name: Name of the variable
    223  * Returns: 0 on success, -1 on error
    224  *
    225  * This function is only used for wpa_cli action scripts. OS wrapper does not
    226  * need to implement this if such functionality is not needed.
    227  */
    228 int os_unsetenv(const char *name);
    229 
    230 /**
    231  * os_readfile - Read a file to an allocated memory buffer
    232  * @name: Name of the file to read
    233  * @len: For returning the length of the allocated buffer
    234  * Returns: Pointer to the allocated buffer or %NULL on failure
    235  *
    236  * This function allocates memory and reads the given file to this buffer. Both
    237  * binary and text files can be read with this function. The caller is
    238  * responsible for freeing the returned buffer with os_free().
    239  */
    240 char * os_readfile(const char *name, size_t *len);
    241 
    242 /**
    243  * os_file_exists - Check whether the specified file exists
    244  * @fname: Path and name of the file
    245  * Returns: 1 if the file exists or 0 if not
    246  */
    247 int os_file_exists(const char *fname);
    248 
    249 /**
    250  * os_fdatasync - Sync a file's (for a given stream) state with storage device
    251  * @stream: the stream to be flushed
    252  * Returns: 0 if the operation succeeded or -1 on failure
    253  */
    254 int os_fdatasync(FILE *stream);
    255 
    256 /**
    257  * os_zalloc - Allocate and zero memory
    258  * @size: Number of bytes to allocate
    259  * Returns: Pointer to allocated and zeroed memory or %NULL on failure
    260  *
    261  * Caller is responsible for freeing the returned buffer with os_free().
    262  */
    263 void * os_zalloc(size_t size);
    264 
    265 /**
    266  * os_calloc - Allocate and zero memory for an array
    267  * @nmemb: Number of members in the array
    268  * @size: Number of bytes in each member
    269  * Returns: Pointer to allocated and zeroed memory or %NULL on failure
    270  *
    271  * This function can be used as a wrapper for os_zalloc(nmemb * size) when an
    272  * allocation is used for an array. The main benefit over os_zalloc() is in
    273  * having an extra check to catch integer overflows in multiplication.
    274  *
    275  * Caller is responsible for freeing the returned buffer with os_free().
    276  */
    277 static inline void * os_calloc(size_t nmemb, size_t size)
    278 {
    279 	if (size && nmemb > (~(size_t) 0) / size)
    280 		return NULL;
    281 	return os_zalloc(nmemb * size);
    282 }
    283 
    284 
    285 /*
    286  * The following functions are wrapper for standard ANSI C or POSIX functions.
    287  * By default, they are just defined to use the standard function name and no
    288  * os_*.c implementation is needed for them. This avoids extra function calls
    289  * by allowing the C pre-processor take care of the function name mapping.
    290  *
    291  * If the target system uses a C library that does not provide these functions,
    292  * build_config.h can be used to define the wrappers to use a different
    293  * function name. This can be done on function-by-function basis since the
    294  * defines here are only used if build_config.h does not define the os_* name.
    295  * If needed, os_*.c file can be used to implement the functions that are not
    296  * included in the C library on the target system. Alternatively,
    297  * OS_NO_C_LIB_DEFINES can be defined to skip all defines here in which case
    298  * these functions need to be implemented in os_*.c file for the target system.
    299  */
    300 
    301 #ifdef OS_NO_C_LIB_DEFINES
    302 
    303 /**
    304  * os_malloc - Allocate dynamic memory
    305  * @size: Size of the buffer to allocate
    306  * Returns: Allocated buffer or %NULL on failure
    307  *
    308  * Caller is responsible for freeing the returned buffer with os_free().
    309  */
    310 void * os_malloc(size_t size);
    311 
    312 /**
    313  * os_realloc - Re-allocate dynamic memory
    314  * @ptr: Old buffer from os_malloc() or os_realloc()
    315  * @size: Size of the new buffer
    316  * Returns: Allocated buffer or %NULL on failure
    317  *
    318  * Caller is responsible for freeing the returned buffer with os_free().
    319  * If re-allocation fails, %NULL is returned and the original buffer (ptr) is
    320  * not freed and caller is still responsible for freeing it.
    321  */
    322 void * os_realloc(void *ptr, size_t size);
    323 
    324 /**
    325  * os_free - Free dynamic memory
    326  * @ptr: Old buffer from os_malloc() or os_realloc(); can be %NULL
    327  */
    328 void os_free(void *ptr);
    329 
    330 /**
    331  * os_memcpy - Copy memory area
    332  * @dest: Destination
    333  * @src: Source
    334  * @n: Number of bytes to copy
    335  * Returns: dest
    336  *
    337  * The memory areas src and dst must not overlap. os_memmove() can be used with
    338  * overlapping memory.
    339  */
    340 void * os_memcpy(void *dest, const void *src, size_t n);
    341 
    342 /**
    343  * os_memmove - Copy memory area
    344  * @dest: Destination
    345  * @src: Source
    346  * @n: Number of bytes to copy
    347  * Returns: dest
    348  *
    349  * The memory areas src and dst may overlap.
    350  */
    351 void * os_memmove(void *dest, const void *src, size_t n);
    352 
    353 /**
    354  * os_memset - Fill memory with a constant byte
    355  * @s: Memory area to be filled
    356  * @c: Constant byte
    357  * @n: Number of bytes started from s to fill with c
    358  * Returns: s
    359  */
    360 void * os_memset(void *s, int c, size_t n);
    361 
    362 /**
    363  * os_memcmp - Compare memory areas
    364  * @s1: First buffer
    365  * @s2: Second buffer
    366  * @n: Maximum numbers of octets to compare
    367  * Returns: An integer less than, equal to, or greater than zero if s1 is
    368  * found to be less than, to match, or be greater than s2. Only first n
    369  * characters will be compared.
    370  */
    371 int os_memcmp(const void *s1, const void *s2, size_t n);
    372 
    373 /**
    374  * os_strdup - Duplicate a string
    375  * @s: Source string
    376  * Returns: Allocated buffer with the string copied into it or %NULL on failure
    377  *
    378  * Caller is responsible for freeing the returned buffer with os_free().
    379  */
    380 char * os_strdup(const char *s);
    381 
    382 /**
    383  * os_strlen - Calculate the length of a string
    384  * @s: '\0' terminated string
    385  * Returns: Number of characters in s (not counting the '\0' terminator)
    386  */
    387 size_t os_strlen(const char *s);
    388 
    389 /**
    390  * os_strcasecmp - Compare two strings ignoring case
    391  * @s1: First string
    392  * @s2: Second string
    393  * Returns: An integer less than, equal to, or greater than zero if s1 is
    394  * found to be less than, to match, or be greatred than s2
    395  */
    396 int os_strcasecmp(const char *s1, const char *s2);
    397 
    398 /**
    399  * os_strncasecmp - Compare two strings ignoring case
    400  * @s1: First string
    401  * @s2: Second string
    402  * @n: Maximum numbers of characters to compare
    403  * Returns: An integer less than, equal to, or greater than zero if s1 is
    404  * found to be less than, to match, or be greater than s2. Only first n
    405  * characters will be compared.
    406  */
    407 int os_strncasecmp(const char *s1, const char *s2, size_t n);
    408 
    409 /**
    410  * os_strchr - Locate the first occurrence of a character in string
    411  * @s: String
    412  * @c: Character to search for
    413  * Returns: Pointer to the matched character or %NULL if not found
    414  */
    415 char * os_strchr(const char *s, int c);
    416 
    417 /**
    418  * os_strrchr - Locate the last occurrence of a character in string
    419  * @s: String
    420  * @c: Character to search for
    421  * Returns: Pointer to the matched character or %NULL if not found
    422  */
    423 char * os_strrchr(const char *s, int c);
    424 
    425 /**
    426  * os_strcmp - Compare two strings
    427  * @s1: First string
    428  * @s2: Second string
    429  * Returns: An integer less than, equal to, or greater than zero if s1 is
    430  * found to be less than, to match, or be greatred than s2
    431  */
    432 int os_strcmp(const char *s1, const char *s2);
    433 
    434 /**
    435  * os_strncmp - Compare two strings
    436  * @s1: First string
    437  * @s2: Second string
    438  * @n: Maximum numbers of characters to compare
    439  * Returns: An integer less than, equal to, or greater than zero if s1 is
    440  * found to be less than, to match, or be greater than s2. Only first n
    441  * characters will be compared.
    442  */
    443 int os_strncmp(const char *s1, const char *s2, size_t n);
    444 
    445 /**
    446  * os_strstr - Locate a substring
    447  * @haystack: String (haystack) to search from
    448  * @needle: Needle to search from haystack
    449  * Returns: Pointer to the beginning of the substring or %NULL if not found
    450  */
    451 char * os_strstr(const char *haystack, const char *needle);
    452 
    453 /**
    454  * os_snprintf - Print to a memory buffer
    455  * @str: Memory buffer to print into
    456  * @size: Maximum length of the str buffer
    457  * @format: printf format
    458  * Returns: Number of characters printed (not including trailing '\0').
    459  *
    460  * If the output buffer is truncated, number of characters which would have
    461  * been written is returned. Since some C libraries return -1 in such a case,
    462  * the caller must be prepared on that value, too, to indicate truncation.
    463  *
    464  * Note: Some C library implementations of snprintf() may not guarantee null
    465  * termination in case the output is truncated. The OS wrapper function of
    466  * os_snprintf() should provide this guarantee, i.e., to null terminate the
    467  * output buffer if a C library version of the function is used and if that
    468  * function does not guarantee null termination.
    469  *
    470  * If the target system does not include snprintf(), see, e.g.,
    471  * http://www.ijs.si/software/snprintf/ for an example of a portable
    472  * implementation of snprintf.
    473  */
    474 int os_snprintf(char *str, size_t size, const char *format, ...);
    475 
    476 #else /* OS_NO_C_LIB_DEFINES */
    477 
    478 #ifdef WPA_TRACE
    479 void * os_malloc(size_t size);
    480 void * os_realloc(void *ptr, size_t size);
    481 void os_free(void *ptr);
    482 char * os_strdup(const char *s);
    483 #else /* WPA_TRACE */
    484 #ifndef os_malloc
    485 #define os_malloc(s) malloc((s))
    486 #endif
    487 #ifndef os_realloc
    488 #define os_realloc(p, s) realloc((p), (s))
    489 #endif
    490 #ifndef os_free
    491 #define os_free(p) free((p))
    492 #endif
    493 #ifndef os_strdup
    494 #ifdef _MSC_VER
    495 #define os_strdup(s) _strdup(s)
    496 #else
    497 #define os_strdup(s) strdup(s)
    498 #endif
    499 #endif
    500 #endif /* WPA_TRACE */
    501 
    502 #ifndef os_memcpy
    503 #define os_memcpy(d, s, n) memcpy((d), (s), (n))
    504 #endif
    505 #ifndef os_memmove
    506 #define os_memmove(d, s, n) memmove((d), (s), (n))
    507 #endif
    508 #ifndef os_memset
    509 #define os_memset(s, c, n) memset(s, c, n)
    510 #endif
    511 #ifndef os_memcmp
    512 #define os_memcmp(s1, s2, n) memcmp((s1), (s2), (n))
    513 #endif
    514 
    515 #ifndef os_strlen
    516 #define os_strlen(s) strlen(s)
    517 #endif
    518 #ifndef os_strcasecmp
    519 #ifdef _MSC_VER
    520 #define os_strcasecmp(s1, s2) _stricmp((s1), (s2))
    521 #else
    522 #define os_strcasecmp(s1, s2) strcasecmp((s1), (s2))
    523 #endif
    524 #endif
    525 #ifndef os_strncasecmp
    526 #ifdef _MSC_VER
    527 #define os_strncasecmp(s1, s2, n) _strnicmp((s1), (s2), (n))
    528 #else
    529 #define os_strncasecmp(s1, s2, n) strncasecmp((s1), (s2), (n))
    530 #endif
    531 #endif
    532 #ifndef os_strchr
    533 #define os_strchr(s, c) strchr((s), (c))
    534 #endif
    535 #ifndef os_strcmp
    536 #define os_strcmp(s1, s2) strcmp((s1), (s2))
    537 #endif
    538 #ifndef os_strncmp
    539 #define os_strncmp(s1, s2, n) strncmp((s1), (s2), (n))
    540 #endif
    541 #ifndef os_strrchr
    542 #define os_strrchr(s, c) strrchr((s), (c))
    543 #endif
    544 #ifndef os_strstr
    545 #define os_strstr(h, n) strstr((h), (n))
    546 #endif
    547 
    548 #ifndef os_snprintf
    549 #ifdef _MSC_VER
    550 #define os_snprintf _snprintf
    551 #else
    552 #define os_snprintf snprintf
    553 #endif
    554 #endif
    555 
    556 #endif /* OS_NO_C_LIB_DEFINES */
    557 
    558 
    559 static inline int os_snprintf_error(size_t size, int res)
    560 {
    561 	return res < 0 || (unsigned int) res >= size;
    562 }
    563 
    564 
    565 static inline void * os_realloc_array(void *ptr, size_t nmemb, size_t size)
    566 {
    567 	if (size && nmemb > (~(size_t) 0) / size)
    568 		return NULL;
    569 	return os_realloc(ptr, nmemb * size);
    570 }
    571 
    572 /**
    573  * os_remove_in_array - Remove a member from an array by index
    574  * @ptr: Pointer to the array
    575  * @nmemb: Current member count of the array
    576  * @size: The size per member of the array
    577  * @idx: Index of the member to be removed
    578  */
    579 static inline void os_remove_in_array(void *ptr, size_t nmemb, size_t size,
    580 				      size_t idx)
    581 {
    582 	if (idx < nmemb - 1)
    583 		os_memmove(((unsigned char *) ptr) + idx * size,
    584 			   ((unsigned char *) ptr) + (idx + 1) * size,
    585 			   (nmemb - idx - 1) * size);
    586 }
    587 
    588 /**
    589  * os_strlcpy - Copy a string with size bound and NUL-termination
    590  * @dest: Destination
    591  * @src: Source
    592  * @siz: Size of the target buffer
    593  * Returns: Total length of the target string (length of src) (not including
    594  * NUL-termination)
    595  *
    596  * This function matches in behavior with the strlcpy(3) function in OpenBSD.
    597  */
    598 size_t os_strlcpy(char *dest, const char *src, size_t siz);
    599 
    600 /**
    601  * os_memcmp_const - Constant time memory comparison
    602  * @a: First buffer to compare
    603  * @b: Second buffer to compare
    604  * @len: Number of octets to compare
    605  * Returns: 0 if buffers are equal, non-zero if not
    606  *
    607  * This function is meant for comparing passwords or hash values where
    608  * difference in execution time could provide external observer information
    609  * about the location of the difference in the memory buffers. The return value
    610  * does not behave like os_memcmp(), i.e., os_memcmp_const() cannot be used to
    611  * sort items into a defined order. Unlike os_memcmp(), execution time of
    612  * os_memcmp_const() does not depend on the contents of the compared memory
    613  * buffers, but only on the total compared length.
    614  */
    615 int os_memcmp_const(const void *a, const void *b, size_t len);
    616 
    617 /**
    618  * os_exec - Execute an external program
    619  * @program: Path to the program
    620  * @arg: Command line argument string
    621  * @wait_completion: Whether to wait until the program execution completes
    622  * Returns: 0 on success, -1 on error
    623  */
    624 int os_exec(const char *program, const char *arg, int wait_completion);
    625 
    626 
    627 #ifdef OS_REJECT_C_LIB_FUNCTIONS
    628 #define malloc OS_DO_NOT_USE_malloc
    629 #define realloc OS_DO_NOT_USE_realloc
    630 #define free OS_DO_NOT_USE_free
    631 #define memcpy OS_DO_NOT_USE_memcpy
    632 #define memmove OS_DO_NOT_USE_memmove
    633 #define memset OS_DO_NOT_USE_memset
    634 #define memcmp OS_DO_NOT_USE_memcmp
    635 #undef strdup
    636 #define strdup OS_DO_NOT_USE_strdup
    637 #define strlen OS_DO_NOT_USE_strlen
    638 #define strcasecmp OS_DO_NOT_USE_strcasecmp
    639 #define strncasecmp OS_DO_NOT_USE_strncasecmp
    640 #undef strchr
    641 #define strchr OS_DO_NOT_USE_strchr
    642 #undef strcmp
    643 #define strcmp OS_DO_NOT_USE_strcmp
    644 #undef strncmp
    645 #define strncmp OS_DO_NOT_USE_strncmp
    646 #undef strncpy
    647 #define strncpy OS_DO_NOT_USE_strncpy
    648 #define strrchr OS_DO_NOT_USE_strrchr
    649 #define strstr OS_DO_NOT_USE_strstr
    650 #undef snprintf
    651 #define snprintf OS_DO_NOT_USE_snprintf
    652 
    653 #define strcpy OS_DO_NOT_USE_strcpy
    654 #endif /* OS_REJECT_C_LIB_FUNCTIONS */
    655 
    656 
    657 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS)
    658 #define TEST_FAIL() testing_test_fail()
    659 int testing_test_fail(void);
    660 #else
    661 #define TEST_FAIL() 0
    662 #endif
    663 
    664 #endif /* OS_H */
    665