file.h 16 KB

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  1. /*
  2. * Copyright (c) Ian F. Darwin 1986-1995.
  3. * Software written by Ian F. Darwin and others;
  4. * maintained 1995-present by Christos Zoulas and others.
  5. *
  6. * Redistribution and use in source and binary forms, with or without
  7. * modification, are permitted provided that the following conditions
  8. * are met:
  9. * 1. Redistributions of source code must retain the above copyright
  10. * notice immediately at the beginning of the file, without modification,
  11. * this list of conditions, and the following disclaimer.
  12. * 2. Redistributions in binary form must reproduce the above copyright
  13. * notice, this list of conditions and the following disclaimer in the
  14. * documentation and/or other materials provided with the distribution.
  15. *
  16. * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19. * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20. * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26. * SUCH DAMAGE.
  27. */
  28. /*
  29. * file.h - definitions for file(1) program
  30. * @(#)$File: file.h,v 1.154 2014/09/10 18:41:51 christos Exp $
  31. */
  32. #ifndef __file_h__
  33. #define __file_h__
  34. #ifdef HAVE_CONFIG_H
  35. #include <config.h>
  36. #endif
  37. #ifdef WIN32
  38. #ifdef _WIN64
  39. #define SIZE_T_FORMAT "I64"
  40. #else
  41. #define SIZE_T_FORMAT ""
  42. #endif
  43. #define INT64_T_FORMAT "I64"
  44. #else
  45. #define SIZE_T_FORMAT "z"
  46. #define INT64_T_FORMAT "ll"
  47. #endif
  48. #include <stdio.h> /* Include that here, to make sure __P gets defined */
  49. #include <errno.h>
  50. #include <fcntl.h> /* For open and flags */
  51. #ifdef HAVE_STDINT_H
  52. #ifndef __STDC_LIMIT_MACROS
  53. #define __STDC_LIMIT_MACROS
  54. #endif
  55. #include <stdint.h>
  56. #endif
  57. #ifdef HAVE_INTTYPES_H
  58. #include <inttypes.h>
  59. #endif
  60. #include <regex.h>
  61. #include <time.h>
  62. #include <sys/types.h>
  63. #include <sys/param.h>
  64. /* Do this here and now, because struct stat gets re-defined on solaris */
  65. #include <sys/stat.h>
  66. #include <stdarg.h>
  67. #define ENABLE_CONDITIONALS
  68. #ifndef MAGIC
  69. #define MAGIC "/etc/magic"
  70. #endif
  71. #if defined(__EMX__) || defined (WIN32)
  72. #define PATHSEP ';'
  73. #else
  74. #define PATHSEP ':'
  75. #endif
  76. #define private static
  77. #if HAVE_VISIBILITY && !defined(WIN32)
  78. #define public __attribute__ ((__visibility__("default")))
  79. #ifndef protected
  80. #define protected __attribute__ ((__visibility__("hidden")))
  81. #endif
  82. #else
  83. #define public
  84. #ifndef protected
  85. #define protected
  86. #endif
  87. #endif
  88. #ifndef __arraycount
  89. #define __arraycount(a) (sizeof(a) / sizeof(a[0]))
  90. #endif
  91. #ifndef __GNUC_PREREQ__
  92. #ifdef __GNUC__
  93. #define __GNUC_PREREQ__(x, y) \
  94. ((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) || \
  95. (__GNUC__ > (x)))
  96. #else
  97. #define __GNUC_PREREQ__(x, y) 0
  98. #endif
  99. #endif
  100. #ifndef __GNUC__
  101. #ifndef __attribute__
  102. #define __attribute__(a)
  103. #endif
  104. #endif
  105. #ifndef MIN
  106. #define MIN(a,b) (((a) < (b)) ? (a) : (b))
  107. #endif
  108. #ifndef MAX
  109. #define MAX(a,b) (((a) > (b)) ? (a) : (b))
  110. #endif
  111. #ifndef HOWMANY
  112. # define HOWMANY (256 * 1024) /* how much of the file to look at */
  113. #endif
  114. #define MAXMAGIS 8192 /* max entries in any one magic file
  115. or directory */
  116. #define MAXDESC 64 /* max len of text description/MIME type */
  117. #define MAXMIME 80 /* max len of text MIME type */
  118. #define MAXstring 64 /* max len of "string" types */
  119. #define MAGICNO 0xF11E041C
  120. #define VERSIONNO 12
  121. #define FILE_MAGICSIZE 248
  122. #define FILE_LOAD 0
  123. #define FILE_CHECK 1
  124. #define FILE_COMPILE 2
  125. #define FILE_LIST 3
  126. union VALUETYPE {
  127. uint8_t b;
  128. uint16_t h;
  129. uint32_t l;
  130. uint64_t q;
  131. uint8_t hs[2]; /* 2 bytes of a fixed-endian "short" */
  132. uint8_t hl[4]; /* 4 bytes of a fixed-endian "long" */
  133. uint8_t hq[8]; /* 8 bytes of a fixed-endian "quad" */
  134. char s[MAXstring]; /* the search string or regex pattern */
  135. unsigned char us[MAXstring];
  136. float f;
  137. double d;
  138. };
  139. struct magic {
  140. /* Word 1 */
  141. uint16_t cont_level; /* level of ">" */
  142. uint8_t flag;
  143. #define INDIR 0x01 /* if '(...)' appears */
  144. #define OFFADD 0x02 /* if '>&' or '>...(&' appears */
  145. #define INDIROFFADD 0x04 /* if '>&(' appears */
  146. #define UNSIGNED 0x08 /* comparison is unsigned */
  147. #define NOSPACE 0x10 /* suppress space character before output */
  148. #define BINTEST 0x20 /* test is for a binary type (set only
  149. for top-level tests) */
  150. #define TEXTTEST 0x40 /* for passing to file_softmagic */
  151. uint8_t factor;
  152. /* Word 2 */
  153. uint8_t reln; /* relation (0=eq, '>'=gt, etc) */
  154. uint8_t vallen; /* length of string value, if any */
  155. uint8_t type; /* comparison type (FILE_*) */
  156. uint8_t in_type; /* type of indirection */
  157. #define FILE_INVALID 0
  158. #define FILE_BYTE 1
  159. #define FILE_SHORT 2
  160. #define FILE_DEFAULT 3
  161. #define FILE_LONG 4
  162. #define FILE_STRING 5
  163. #define FILE_DATE 6
  164. #define FILE_BESHORT 7
  165. #define FILE_BELONG 8
  166. #define FILE_BEDATE 9
  167. #define FILE_LESHORT 10
  168. #define FILE_LELONG 11
  169. #define FILE_LEDATE 12
  170. #define FILE_PSTRING 13
  171. #define FILE_LDATE 14
  172. #define FILE_BELDATE 15
  173. #define FILE_LELDATE 16
  174. #define FILE_REGEX 17
  175. #define FILE_BESTRING16 18
  176. #define FILE_LESTRING16 19
  177. #define FILE_SEARCH 20
  178. #define FILE_MEDATE 21
  179. #define FILE_MELDATE 22
  180. #define FILE_MELONG 23
  181. #define FILE_QUAD 24
  182. #define FILE_LEQUAD 25
  183. #define FILE_BEQUAD 26
  184. #define FILE_QDATE 27
  185. #define FILE_LEQDATE 28
  186. #define FILE_BEQDATE 29
  187. #define FILE_QLDATE 30
  188. #define FILE_LEQLDATE 31
  189. #define FILE_BEQLDATE 32
  190. #define FILE_FLOAT 33
  191. #define FILE_BEFLOAT 34
  192. #define FILE_LEFLOAT 35
  193. #define FILE_DOUBLE 36
  194. #define FILE_BEDOUBLE 37
  195. #define FILE_LEDOUBLE 38
  196. #define FILE_BEID3 39
  197. #define FILE_LEID3 40
  198. #define FILE_INDIRECT 41
  199. #define FILE_QWDATE 42
  200. #define FILE_LEQWDATE 43
  201. #define FILE_BEQWDATE 44
  202. #define FILE_NAME 45
  203. #define FILE_USE 46
  204. #define FILE_CLEAR 47
  205. #define FILE_NAMES_SIZE 48 /* size of array to contain all names */
  206. #define IS_STRING(t) \
  207. ((t) == FILE_STRING || \
  208. (t) == FILE_PSTRING || \
  209. (t) == FILE_BESTRING16 || \
  210. (t) == FILE_LESTRING16 || \
  211. (t) == FILE_REGEX || \
  212. (t) == FILE_SEARCH || \
  213. (t) == FILE_NAME || \
  214. (t) == FILE_USE)
  215. #define FILE_FMT_NONE 0
  216. #define FILE_FMT_NUM 1 /* "cduxXi" */
  217. #define FILE_FMT_STR 2 /* "s" */
  218. #define FILE_FMT_QUAD 3 /* "ll" */
  219. #define FILE_FMT_FLOAT 4 /* "eEfFgG" */
  220. #define FILE_FMT_DOUBLE 5 /* "eEfFgG" */
  221. /* Word 3 */
  222. uint8_t in_op; /* operator for indirection */
  223. uint8_t mask_op; /* operator for mask */
  224. #ifdef ENABLE_CONDITIONALS
  225. uint8_t cond; /* conditional type */
  226. #else
  227. uint8_t dummy;
  228. #endif
  229. uint8_t factor_op;
  230. #define FILE_FACTOR_OP_PLUS '+'
  231. #define FILE_FACTOR_OP_MINUS '-'
  232. #define FILE_FACTOR_OP_TIMES '*'
  233. #define FILE_FACTOR_OP_DIV '/'
  234. #define FILE_FACTOR_OP_NONE '\0'
  235. #define FILE_OPS "&|^+-*/%"
  236. #define FILE_OPAND 0
  237. #define FILE_OPOR 1
  238. #define FILE_OPXOR 2
  239. #define FILE_OPADD 3
  240. #define FILE_OPMINUS 4
  241. #define FILE_OPMULTIPLY 5
  242. #define FILE_OPDIVIDE 6
  243. #define FILE_OPMODULO 7
  244. #define FILE_OPS_MASK 0x07 /* mask for above ops */
  245. #define FILE_UNUSED_1 0x08
  246. #define FILE_UNUSED_2 0x10
  247. #define FILE_UNUSED_3 0x20
  248. #define FILE_OPINVERSE 0x40
  249. #define FILE_OPINDIRECT 0x80
  250. #ifdef ENABLE_CONDITIONALS
  251. #define COND_NONE 0
  252. #define COND_IF 1
  253. #define COND_ELIF 2
  254. #define COND_ELSE 3
  255. #endif /* ENABLE_CONDITIONALS */
  256. /* Word 4 */
  257. uint32_t offset; /* offset to magic number */
  258. /* Word 5 */
  259. int32_t in_offset; /* offset from indirection */
  260. /* Word 6 */
  261. uint32_t lineno; /* line number in magic file */
  262. /* Word 7,8 */
  263. union {
  264. uint64_t _mask; /* for use with numeric and date types */
  265. struct {
  266. uint32_t _count; /* repeat/line count */
  267. uint32_t _flags; /* modifier flags */
  268. } _s; /* for use with string types */
  269. } _u;
  270. #define num_mask _u._mask
  271. #define str_range _u._s._count
  272. #define str_flags _u._s._flags
  273. /* Words 9-16 */
  274. union VALUETYPE value; /* either number or string */
  275. /* Words 17-32 */
  276. char desc[MAXDESC]; /* description */
  277. /* Words 33-52 */
  278. char mimetype[MAXMIME]; /* MIME type */
  279. /* Words 53-54 */
  280. char apple[8];
  281. };
  282. #define BIT(A) (1 << (A))
  283. #define STRING_COMPACT_WHITESPACE BIT(0)
  284. #define STRING_COMPACT_OPTIONAL_WHITESPACE BIT(1)
  285. #define STRING_IGNORE_LOWERCASE BIT(2)
  286. #define STRING_IGNORE_UPPERCASE BIT(3)
  287. #define REGEX_OFFSET_START BIT(4)
  288. #define STRING_TEXTTEST BIT(5)
  289. #define STRING_BINTEST BIT(6)
  290. #define PSTRING_1_BE BIT(7)
  291. #define PSTRING_1_LE BIT(7)
  292. #define PSTRING_2_BE BIT(8)
  293. #define PSTRING_2_LE BIT(9)
  294. #define PSTRING_4_BE BIT(10)
  295. #define PSTRING_4_LE BIT(11)
  296. #define REGEX_LINE_COUNT BIT(11)
  297. #define PSTRING_LEN \
  298. (PSTRING_1_BE|PSTRING_2_LE|PSTRING_2_BE|PSTRING_4_LE|PSTRING_4_BE)
  299. #define PSTRING_LENGTH_INCLUDES_ITSELF BIT(12)
  300. #define STRING_TRIM BIT(13)
  301. #define CHAR_COMPACT_WHITESPACE 'W'
  302. #define CHAR_COMPACT_OPTIONAL_WHITESPACE 'w'
  303. #define CHAR_IGNORE_LOWERCASE 'c'
  304. #define CHAR_IGNORE_UPPERCASE 'C'
  305. #define CHAR_REGEX_OFFSET_START 's'
  306. #define CHAR_TEXTTEST 't'
  307. #define CHAR_TRIM 'T'
  308. #define CHAR_BINTEST 'b'
  309. #define CHAR_PSTRING_1_BE 'B'
  310. #define CHAR_PSTRING_1_LE 'B'
  311. #define CHAR_PSTRING_2_BE 'H'
  312. #define CHAR_PSTRING_2_LE 'h'
  313. #define CHAR_PSTRING_4_BE 'L'
  314. #define CHAR_PSTRING_4_LE 'l'
  315. #define CHAR_PSTRING_LENGTH_INCLUDES_ITSELF 'J'
  316. #define STRING_IGNORE_CASE (STRING_IGNORE_LOWERCASE|STRING_IGNORE_UPPERCASE)
  317. #define STRING_DEFAULT_RANGE 100
  318. /* list of magic entries */
  319. struct mlist {
  320. struct magic *magic; /* array of magic entries */
  321. uint32_t nmagic; /* number of entries in array */
  322. void *map; /* internal resources used by entry */
  323. struct mlist *next, *prev;
  324. };
  325. #ifdef __cplusplus
  326. #define CAST(T, b) static_cast<T>(b)
  327. #define RCAST(T, b) reinterpret_cast<T>(b)
  328. #else
  329. #define CAST(T, b) (T)(b)
  330. #define RCAST(T, b) (T)(b)
  331. #endif
  332. struct level_info {
  333. int32_t off;
  334. int got_match;
  335. #ifdef ENABLE_CONDITIONALS
  336. int last_match;
  337. int last_cond; /* used for error checking by parse() */
  338. #endif
  339. };
  340. #define MAGIC_SETS 2
  341. struct magic_set {
  342. struct mlist *mlist[MAGIC_SETS]; /* list of regular entries */
  343. struct cont {
  344. size_t len;
  345. struct level_info *li;
  346. } c;
  347. struct out {
  348. char *buf; /* Accumulation buffer */
  349. char *pbuf; /* Printable buffer */
  350. } o;
  351. uint32_t offset;
  352. int error;
  353. int flags; /* Control magic tests. */
  354. int event_flags; /* Note things that happened. */
  355. #define EVENT_HAD_ERR 0x01
  356. const char *file;
  357. size_t line; /* current magic line number */
  358. /* data for searches */
  359. struct {
  360. const char *s; /* start of search in original source */
  361. size_t s_len; /* length of search region */
  362. size_t offset; /* starting offset in source: XXX - should this be off_t? */
  363. size_t rm_len; /* match length */
  364. } search;
  365. /* FIXME: Make the string dynamically allocated so that e.g.
  366. strings matched in files can be longer than MAXstring */
  367. union VALUETYPE ms_value; /* either number or string */
  368. };
  369. /* Type for Unicode characters */
  370. typedef unsigned long unichar;
  371. struct stat;
  372. #define FILE_T_LOCAL 1
  373. #define FILE_T_WINDOWS 2
  374. protected const char *file_fmttime(uint64_t, int, char *);
  375. protected struct magic_set *file_ms_alloc(int);
  376. protected void file_ms_free(struct magic_set *);
  377. protected int file_buffer(struct magic_set *, int, const char *, const void *,
  378. size_t);
  379. protected int file_fsmagic(struct magic_set *, const char *, struct stat *);
  380. protected int file_pipe2file(struct magic_set *, int, const void *, size_t);
  381. protected int file_vprintf(struct magic_set *, const char *, va_list)
  382. __attribute__((__format__(__printf__, 2, 0)));
  383. protected size_t file_printedlen(const struct magic_set *);
  384. protected int file_replace(struct magic_set *, const char *, const char *);
  385. protected int file_printf(struct magic_set *, const char *, ...)
  386. __attribute__((__format__(__printf__, 2, 3)));
  387. protected int file_reset(struct magic_set *);
  388. protected int file_tryelf(struct magic_set *, int, const unsigned char *,
  389. size_t);
  390. protected int file_trycdf(struct magic_set *, int, const unsigned char *,
  391. size_t);
  392. #if HAVE_FORK
  393. protected int file_zmagic(struct magic_set *, int, const char *,
  394. const unsigned char *, size_t);
  395. #endif
  396. protected int file_ascmagic(struct magic_set *, const unsigned char *, size_t,
  397. int);
  398. protected int file_ascmagic_with_encoding(struct magic_set *,
  399. const unsigned char *, size_t, unichar *, size_t, const char *,
  400. const char *, int);
  401. protected int file_encoding(struct magic_set *, const unsigned char *, size_t,
  402. unichar **, size_t *, const char **, const char **, const char **);
  403. protected int file_is_tar(struct magic_set *, const unsigned char *, size_t);
  404. protected int file_softmagic(struct magic_set *, const unsigned char *, size_t,
  405. size_t, int, int);
  406. protected int file_apprentice(struct magic_set *, const char *, int);
  407. protected int buffer_apprentice(struct magic_set *, struct magic **,
  408. size_t *, size_t);
  409. protected int file_magicfind(struct magic_set *, const char *, struct mlist *);
  410. protected uint64_t file_signextend(struct magic_set *, struct magic *,
  411. uint64_t);
  412. protected void file_badread(struct magic_set *);
  413. protected void file_badseek(struct magic_set *);
  414. protected void file_oomem(struct magic_set *, size_t);
  415. protected void file_error(struct magic_set *, int, const char *, ...)
  416. __attribute__((__format__(__printf__, 3, 4)));
  417. protected void file_magerror(struct magic_set *, const char *, ...)
  418. __attribute__((__format__(__printf__, 2, 3)));
  419. protected void file_magwarn(struct magic_set *, const char *, ...)
  420. __attribute__((__format__(__printf__, 2, 3)));
  421. protected void file_mdump(struct magic *);
  422. protected void file_showstr(FILE *, const char *, size_t);
  423. protected size_t file_mbswidth(const char *);
  424. protected const char *file_getbuffer(struct magic_set *);
  425. protected ssize_t sread(int, void *, size_t, int);
  426. protected int file_check_mem(struct magic_set *, unsigned int);
  427. protected int file_looks_utf8(const unsigned char *, size_t, unichar *,
  428. size_t *);
  429. protected size_t file_pstring_length_size(const struct magic *);
  430. protected size_t file_pstring_get_length(const struct magic *, const char *);
  431. #ifdef __EMX__
  432. protected int file_os2_apptype(struct magic_set *, const char *, const void *,
  433. size_t);
  434. #endif /* __EMX__ */
  435. #if defined(HAVE_LOCALE_H)
  436. #include <locale.h>
  437. #endif
  438. typedef struct {
  439. const char *pat;
  440. #if defined(HAVE_NEWLOCALE) && defined(HAVE_USELOCALE) && defined(HAVE_FREELOCALE)
  441. #define USE_C_LOCALE
  442. locale_t old_lc_ctype;
  443. locale_t c_lc_ctype;
  444. #endif
  445. int rc;
  446. regex_t rx;
  447. } file_regex_t;
  448. protected int file_regcomp(file_regex_t *, const char *, int);
  449. protected int file_regexec(file_regex_t *, const char *, size_t, regmatch_t *,
  450. int);
  451. protected void file_regfree(file_regex_t *);
  452. protected void file_regerror(file_regex_t *, int, struct magic_set *);
  453. #ifndef COMPILE_ONLY
  454. extern const char *file_names[];
  455. extern const size_t file_nnames;
  456. #endif
  457. #ifndef HAVE_STRERROR
  458. extern int sys_nerr;
  459. extern char *sys_errlist[];
  460. #define strerror(e) \
  461. (((e) >= 0 && (e) < sys_nerr) ? sys_errlist[(e)] : "Unknown error")
  462. #endif
  463. #ifndef HAVE_STRTOUL
  464. #define strtoul(a, b, c) strtol(a, b, c)
  465. #endif
  466. #ifndef HAVE_PREAD
  467. ssize_t pread(int, void *, size_t, off_t);
  468. #endif
  469. #ifndef HAVE_VASPRINTF
  470. int vasprintf(char **, const char *, va_list);
  471. #endif
  472. #ifndef HAVE_ASPRINTF
  473. int asprintf(char **, const char *, ...);
  474. #endif
  475. #ifndef HAVE_STRLCPY
  476. size_t strlcpy(char *, const char *, size_t);
  477. #endif
  478. #ifndef HAVE_STRLCAT
  479. size_t strlcat(char *, const char *, size_t);
  480. #endif
  481. #ifndef HAVE_STRCASESTR
  482. char *strcasestr(const char *, const char *);
  483. #endif
  484. #ifndef HAVE_GETLINE
  485. ssize_t getline(char **, size_t *, FILE *);
  486. ssize_t getdelim(char **, size_t *, int, FILE *);
  487. #endif
  488. #ifndef HAVE_CTIME_R
  489. char *ctime_r(const time_t *, char *);
  490. #endif
  491. #ifndef HAVE_ASCTIME_R
  492. char *asctime_r(const struct tm *, char *);
  493. #endif
  494. #ifndef HAVE_FMTCHECK
  495. const char *fmtcheck(const char *, const char *)
  496. __attribute__((__format_arg__(2)));
  497. #endif
  498. #if defined(HAVE_MMAP) && defined(HAVE_SYS_MMAN_H) && !defined(QUICK)
  499. #define QUICK
  500. #endif
  501. #ifndef O_BINARY
  502. #define O_BINARY 0
  503. #endif
  504. #ifndef __cplusplus
  505. #if defined(__GNUC__) && (__GNUC__ >= 3)
  506. #define FILE_RCSID(id) \
  507. static const char rcsid[] __attribute__((__used__)) = id;
  508. #else
  509. #define FILE_RCSID(id) \
  510. static const char *rcsid(const char *p) { \
  511. return rcsid(p = id); \
  512. }
  513. #endif
  514. #else
  515. #define FILE_RCSID(id)
  516. #endif
  517. #endif /* __file_h__ */