Line data Source code
1 : /*
2 : * OS specific functions
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 : #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 1085324 : static inline int os_reltime_before(struct os_reltime *a,
70 : struct os_reltime *b)
71 : {
72 2338528 : return (a->sec < b->sec) ||
73 846843 : (a->sec == b->sec && a->usec < b->usec);
74 : }
75 :
76 :
77 359365 : static inline void os_reltime_sub(struct os_reltime *a, struct os_reltime *b,
78 : struct os_reltime *res)
79 : {
80 359365 : res->sec = a->sec - b->sec;
81 359365 : res->usec = a->usec - b->usec;
82 359365 : if (res->usec < 0) {
83 164795 : res->sec--;
84 164795 : res->usec += 1000000;
85 : }
86 359365 : }
87 :
88 :
89 68 : static inline void os_reltime_age(struct os_reltime *start,
90 : struct os_reltime *age)
91 : {
92 : struct os_reltime now;
93 :
94 68 : os_get_reltime(&now);
95 68 : os_reltime_sub(&now, start, age);
96 68 : }
97 :
98 :
99 1525 : 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 1525 : os_reltime_sub(now, ts, &age);
106 3068 : return (age.sec > timeout_secs) ||
107 1518 : (age.sec == timeout_secs && age.usec > 0);
108 : }
109 :
110 :
111 2760 : static inline int os_reltime_initialized(struct os_reltime *t)
112 : {
113 2760 : 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_zalloc - Allocate and zero memory
251 : * @size: Number of bytes to allocate
252 : * Returns: Pointer to allocated and zeroed memory or %NULL on failure
253 : *
254 : * Caller is responsible for freeing the returned buffer with os_free().
255 : */
256 : void * os_zalloc(size_t size);
257 :
258 : /**
259 : * os_calloc - Allocate and zero memory for an array
260 : * @nmemb: Number of members in the array
261 : * @size: Number of bytes in each member
262 : * Returns: Pointer to allocated and zeroed memory or %NULL on failure
263 : *
264 : * This function can be used as a wrapper for os_zalloc(nmemb * size) when an
265 : * allocation is used for an array. The main benefit over os_zalloc() is in
266 : * having an extra check to catch integer overflows in multiplication.
267 : *
268 : * Caller is responsible for freeing the returned buffer with os_free().
269 : */
270 51887 : static inline void * os_calloc(size_t nmemb, size_t size)
271 : {
272 51887 : if (size && nmemb > (~(size_t) 0) / size)
273 0 : return NULL;
274 51887 : return os_zalloc(nmemb * size);
275 : }
276 :
277 :
278 : /*
279 : * The following functions are wrapper for standard ANSI C or POSIX functions.
280 : * By default, they are just defined to use the standard function name and no
281 : * os_*.c implementation is needed for them. This avoids extra function calls
282 : * by allowing the C pre-processor take care of the function name mapping.
283 : *
284 : * If the target system uses a C library that does not provide these functions,
285 : * build_config.h can be used to define the wrappers to use a different
286 : * function name. This can be done on function-by-function basis since the
287 : * defines here are only used if build_config.h does not define the os_* name.
288 : * If needed, os_*.c file can be used to implement the functions that are not
289 : * included in the C library on the target system. Alternatively,
290 : * OS_NO_C_LIB_DEFINES can be defined to skip all defines here in which case
291 : * these functions need to be implemented in os_*.c file for the target system.
292 : */
293 :
294 : #ifdef OS_NO_C_LIB_DEFINES
295 :
296 : /**
297 : * os_malloc - Allocate dynamic memory
298 : * @size: Size of the buffer to allocate
299 : * Returns: Allocated buffer or %NULL on failure
300 : *
301 : * Caller is responsible for freeing the returned buffer with os_free().
302 : */
303 : void * os_malloc(size_t size);
304 :
305 : /**
306 : * os_realloc - Re-allocate dynamic memory
307 : * @ptr: Old buffer from os_malloc() or os_realloc()
308 : * @size: Size of the new buffer
309 : * Returns: Allocated buffer or %NULL on failure
310 : *
311 : * Caller is responsible for freeing the returned buffer with os_free().
312 : * If re-allocation fails, %NULL is returned and the original buffer (ptr) is
313 : * not freed and caller is still responsible for freeing it.
314 : */
315 : void * os_realloc(void *ptr, size_t size);
316 :
317 : /**
318 : * os_free - Free dynamic memory
319 : * @ptr: Old buffer from os_malloc() or os_realloc(); can be %NULL
320 : */
321 : void os_free(void *ptr);
322 :
323 : /**
324 : * os_memcpy - Copy memory area
325 : * @dest: Destination
326 : * @src: Source
327 : * @n: Number of bytes to copy
328 : * Returns: dest
329 : *
330 : * The memory areas src and dst must not overlap. os_memmove() can be used with
331 : * overlapping memory.
332 : */
333 : void * os_memcpy(void *dest, const void *src, size_t n);
334 :
335 : /**
336 : * os_memmove - Copy memory area
337 : * @dest: Destination
338 : * @src: Source
339 : * @n: Number of bytes to copy
340 : * Returns: dest
341 : *
342 : * The memory areas src and dst may overlap.
343 : */
344 : void * os_memmove(void *dest, const void *src, size_t n);
345 :
346 : /**
347 : * os_memset - Fill memory with a constant byte
348 : * @s: Memory area to be filled
349 : * @c: Constant byte
350 : * @n: Number of bytes started from s to fill with c
351 : * Returns: s
352 : */
353 : void * os_memset(void *s, int c, size_t n);
354 :
355 : /**
356 : * os_memcmp - Compare memory areas
357 : * @s1: First buffer
358 : * @s2: Second buffer
359 : * @n: Maximum numbers of octets to compare
360 : * Returns: An integer less than, equal to, or greater than zero if s1 is
361 : * found to be less than, to match, or be greater than s2. Only first n
362 : * characters will be compared.
363 : */
364 : int os_memcmp(const void *s1, const void *s2, size_t n);
365 :
366 : /**
367 : * os_strdup - Duplicate a string
368 : * @s: Source string
369 : * Returns: Allocated buffer with the string copied into it or %NULL on failure
370 : *
371 : * Caller is responsible for freeing the returned buffer with os_free().
372 : */
373 : char * os_strdup(const char *s);
374 :
375 : /**
376 : * os_strlen - Calculate the length of a string
377 : * @s: '\0' terminated string
378 : * Returns: Number of characters in s (not counting the '\0' terminator)
379 : */
380 : size_t os_strlen(const char *s);
381 :
382 : /**
383 : * os_strcasecmp - Compare two strings ignoring case
384 : * @s1: First string
385 : * @s2: Second string
386 : * Returns: An integer less than, equal to, or greater than zero if s1 is
387 : * found to be less than, to match, or be greatred than s2
388 : */
389 : int os_strcasecmp(const char *s1, const char *s2);
390 :
391 : /**
392 : * os_strncasecmp - Compare two strings ignoring case
393 : * @s1: First string
394 : * @s2: Second string
395 : * @n: Maximum numbers of characters to compare
396 : * Returns: An integer less than, equal to, or greater than zero if s1 is
397 : * found to be less than, to match, or be greater than s2. Only first n
398 : * characters will be compared.
399 : */
400 : int os_strncasecmp(const char *s1, const char *s2, size_t n);
401 :
402 : /**
403 : * os_strchr - Locate the first occurrence of a character in string
404 : * @s: String
405 : * @c: Character to search for
406 : * Returns: Pointer to the matched character or %NULL if not found
407 : */
408 : char * os_strchr(const char *s, int c);
409 :
410 : /**
411 : * os_strrchr - Locate the last occurrence of a character in string
412 : * @s: String
413 : * @c: Character to search for
414 : * Returns: Pointer to the matched character or %NULL if not found
415 : */
416 : char * os_strrchr(const char *s, int c);
417 :
418 : /**
419 : * os_strcmp - Compare two strings
420 : * @s1: First string
421 : * @s2: Second string
422 : * Returns: An integer less than, equal to, or greater than zero if s1 is
423 : * found to be less than, to match, or be greatred than s2
424 : */
425 : int os_strcmp(const char *s1, const char *s2);
426 :
427 : /**
428 : * os_strncmp - Compare two strings
429 : * @s1: First string
430 : * @s2: Second string
431 : * @n: Maximum numbers of characters to compare
432 : * Returns: An integer less than, equal to, or greater than zero if s1 is
433 : * found to be less than, to match, or be greater than s2. Only first n
434 : * characters will be compared.
435 : */
436 : int os_strncmp(const char *s1, const char *s2, size_t n);
437 :
438 : /**
439 : * os_strstr - Locate a substring
440 : * @haystack: String (haystack) to search from
441 : * @needle: Needle to search from haystack
442 : * Returns: Pointer to the beginning of the substring or %NULL if not found
443 : */
444 : char * os_strstr(const char *haystack, const char *needle);
445 :
446 : /**
447 : * os_snprintf - Print to a memory buffer
448 : * @str: Memory buffer to print into
449 : * @size: Maximum length of the str buffer
450 : * @format: printf format
451 : * Returns: Number of characters printed (not including trailing '\0').
452 : *
453 : * If the output buffer is truncated, number of characters which would have
454 : * been written is returned. Since some C libraries return -1 in such a case,
455 : * the caller must be prepared on that value, too, to indicate truncation.
456 : *
457 : * Note: Some C library implementations of snprintf() may not guarantee null
458 : * termination in case the output is truncated. The OS wrapper function of
459 : * os_snprintf() should provide this guarantee, i.e., to null terminate the
460 : * output buffer if a C library version of the function is used and if that
461 : * function does not guarantee null termination.
462 : *
463 : * If the target system does not include snprintf(), see, e.g.,
464 : * http://www.ijs.si/software/snprintf/ for an example of a portable
465 : * implementation of snprintf.
466 : */
467 : int os_snprintf(char *str, size_t size, const char *format, ...);
468 :
469 : #else /* OS_NO_C_LIB_DEFINES */
470 :
471 : #ifdef WPA_TRACE
472 : void * os_malloc(size_t size);
473 : void * os_realloc(void *ptr, size_t size);
474 : void os_free(void *ptr);
475 : char * os_strdup(const char *s);
476 : #else /* WPA_TRACE */
477 : #ifndef os_malloc
478 : #define os_malloc(s) malloc((s))
479 : #endif
480 : #ifndef os_realloc
481 : #define os_realloc(p, s) realloc((p), (s))
482 : #endif
483 : #ifndef os_free
484 : #define os_free(p) free((p))
485 : #endif
486 : #ifndef os_strdup
487 : #ifdef _MSC_VER
488 : #define os_strdup(s) _strdup(s)
489 : #else
490 : #define os_strdup(s) strdup(s)
491 : #endif
492 : #endif
493 : #endif /* WPA_TRACE */
494 :
495 : #ifndef os_memcpy
496 : #define os_memcpy(d, s, n) memcpy((d), (s), (n))
497 : #endif
498 : #ifndef os_memmove
499 : #define os_memmove(d, s, n) memmove((d), (s), (n))
500 : #endif
501 : #ifndef os_memset
502 : #define os_memset(s, c, n) memset(s, c, n)
503 : #endif
504 : #ifndef os_memcmp
505 : #define os_memcmp(s1, s2, n) memcmp((s1), (s2), (n))
506 : #endif
507 :
508 : #ifndef os_strlen
509 : #define os_strlen(s) strlen(s)
510 : #endif
511 : #ifndef os_strcasecmp
512 : #ifdef _MSC_VER
513 : #define os_strcasecmp(s1, s2) _stricmp((s1), (s2))
514 : #else
515 : #define os_strcasecmp(s1, s2) strcasecmp((s1), (s2))
516 : #endif
517 : #endif
518 : #ifndef os_strncasecmp
519 : #ifdef _MSC_VER
520 : #define os_strncasecmp(s1, s2, n) _strnicmp((s1), (s2), (n))
521 : #else
522 : #define os_strncasecmp(s1, s2, n) strncasecmp((s1), (s2), (n))
523 : #endif
524 : #endif
525 : #ifndef os_strchr
526 : #define os_strchr(s, c) strchr((s), (c))
527 : #endif
528 : #ifndef os_strcmp
529 : #define os_strcmp(s1, s2) strcmp((s1), (s2))
530 : #endif
531 : #ifndef os_strncmp
532 : #define os_strncmp(s1, s2, n) strncmp((s1), (s2), (n))
533 : #endif
534 : #ifndef os_strrchr
535 : #define os_strrchr(s, c) strrchr((s), (c))
536 : #endif
537 : #ifndef os_strstr
538 : #define os_strstr(h, n) strstr((h), (n))
539 : #endif
540 :
541 : #ifndef os_snprintf
542 : #ifdef _MSC_VER
543 : #define os_snprintf _snprintf
544 : #else
545 : #define os_snprintf snprintf
546 : #endif
547 : #endif
548 :
549 : #endif /* OS_NO_C_LIB_DEFINES */
550 :
551 :
552 4189200 : static inline int os_snprintf_error(size_t size, int res)
553 : {
554 4189200 : return res < 0 || (unsigned int) res >= size;
555 : }
556 :
557 :
558 397159 : static inline void * os_realloc_array(void *ptr, size_t nmemb, size_t size)
559 : {
560 397159 : if (size && nmemb > (~(size_t) 0) / size)
561 0 : return NULL;
562 397159 : return os_realloc(ptr, nmemb * size);
563 : }
564 :
565 : /**
566 : * os_remove_in_array - Remove a member from an array by index
567 : * @ptr: Pointer to the array
568 : * @nmemb: Current member count of the array
569 : * @size: The size per member of the array
570 : * @idx: Index of the member to be removed
571 : */
572 8 : static inline void os_remove_in_array(void *ptr, size_t nmemb, size_t size,
573 : size_t idx)
574 : {
575 8 : if (idx < nmemb - 1)
576 4 : os_memmove(((unsigned char *) ptr) + idx * size,
577 : ((unsigned char *) ptr) + (idx + 1) * size,
578 : (nmemb - idx - 1) * size);
579 8 : }
580 :
581 : /**
582 : * os_strlcpy - Copy a string with size bound and NUL-termination
583 : * @dest: Destination
584 : * @src: Source
585 : * @siz: Size of the target buffer
586 : * Returns: Total length of the target string (length of src) (not including
587 : * NUL-termination)
588 : *
589 : * This function matches in behavior with the strlcpy(3) function in OpenBSD.
590 : */
591 : size_t os_strlcpy(char *dest, const char *src, size_t siz);
592 :
593 : /**
594 : * os_memcmp_const - Constant time memory comparison
595 : * @a: First buffer to compare
596 : * @b: Second buffer to compare
597 : * @len: Number of octets to compare
598 : * Returns: 0 if buffers are equal, non-zero if not
599 : *
600 : * This function is meant for comparing passwords or hash values where
601 : * difference in execution time could provide external observer information
602 : * about the location of the difference in the memory buffers. The return value
603 : * does not behave like os_memcmp(), i.e., os_memcmp_const() cannot be used to
604 : * sort items into a defined order. Unlike os_memcmp(), execution time of
605 : * os_memcmp_const() does not depend on the contents of the compared memory
606 : * buffers, but only on the total compared length.
607 : */
608 : int os_memcmp_const(const void *a, const void *b, size_t len);
609 :
610 : /**
611 : * os_exec - Execute an external program
612 : * @program: Path to the program
613 : * @arg: Command line argument string
614 : * @wait_completion: Whether to wait until the program execution completes
615 : * Returns: 0 on success, -1 on error
616 : */
617 : int os_exec(const char *program, const char *arg, int wait_completion);
618 :
619 :
620 : #ifdef OS_REJECT_C_LIB_FUNCTIONS
621 : #define malloc OS_DO_NOT_USE_malloc
622 : #define realloc OS_DO_NOT_USE_realloc
623 : #define free OS_DO_NOT_USE_free
624 : #define memcpy OS_DO_NOT_USE_memcpy
625 : #define memmove OS_DO_NOT_USE_memmove
626 : #define memset OS_DO_NOT_USE_memset
627 : #define memcmp OS_DO_NOT_USE_memcmp
628 : #undef strdup
629 : #define strdup OS_DO_NOT_USE_strdup
630 : #define strlen OS_DO_NOT_USE_strlen
631 : #define strcasecmp OS_DO_NOT_USE_strcasecmp
632 : #define strncasecmp OS_DO_NOT_USE_strncasecmp
633 : #undef strchr
634 : #define strchr OS_DO_NOT_USE_strchr
635 : #undef strcmp
636 : #define strcmp OS_DO_NOT_USE_strcmp
637 : #undef strncmp
638 : #define strncmp OS_DO_NOT_USE_strncmp
639 : #undef strncpy
640 : #define strncpy OS_DO_NOT_USE_strncpy
641 : #define strrchr OS_DO_NOT_USE_strrchr
642 : #define strstr OS_DO_NOT_USE_strstr
643 : #undef snprintf
644 : #define snprintf OS_DO_NOT_USE_snprintf
645 :
646 : #define strcpy OS_DO_NOT_USE_strcpy
647 : #endif /* OS_REJECT_C_LIB_FUNCTIONS */
648 :
649 : #endif /* OS_H */
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