contrib/file-4/src/file.h

   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 1.92 2007/11/08 00:31:37 christos Exp $
  31  */
  32
  33 #ifndef __file_h__
  34 #define __file_h__
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include <config.h>
  38 #endif
  39
  40 #include <stdio.h>      /* Include that here, to make sure __P gets defined */
  41 #include <errno.h>
  42 #include <fcntl.h>      /* For open and flags */
  43 #ifdef HAVE_STDINT_H
  44 #include <stdint.h>
  45 #endif
  46 #ifdef HAVE_INTTYPES_H
  47 #include <inttypes.h>
  48 #endif
  49 #include <regex.h>
  50 #include <sys/types.h>
  51 /* Do this here and now, because struct stat gets re-defined on solaris */
  52 #include <sys/stat.h>
  53
  54 #define ENABLE_CONDITIONALS
  55
  56 #ifndef MAGIC
  57 #define MAGIC "/etc/magic"
  58 #endif
  59
  60 #ifdef __EMX__
  61 #define PATHSEP ';'
  62 #else
  63 #define PATHSEP ':'
  64 #endif
  65
  66 #define private static
  67 #ifndef protected
  68 #define protected
  69 #endif
  70 #define public
  71
  72 #ifndef __GNUC_PREREQ__
  73 #ifdef __GNUC__
  74 #define __GNUC_PREREQ__(x, y)                                           \
  75         ((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) ||                  \
  76          (__GNUC__ > (x)))
  77 #else
  78 #define __GNUC_PREREQ__(x, y)   0
  79 #endif
  80 #endif
  81
  82 #ifndef MIN
  83 #define MIN(a,b)        (((a) < (b)) ? (a) : (b))
  84 #endif
  85
  86 #ifndef HOWMANY
  87 # define HOWMANY (256 * 1024)   /* how much of the file to look at */
  88 #endif
  89 #define MAXMAGIS 8192           /* max entries in /etc/magic */
  90 #define MAXDESC 64              /* max leng of text description */
  91 #define MAXstring 32            /* max leng of "string" types */
  92
  93 #define MAGICNO         0xF11E041C
  94 #define VERSIONNO       4
  95 #define FILE_MAGICSIZE  (32 * 4)
  96
  97 #define FILE_LOAD       0
  98 #define FILE_CHECK      1
  99 #define FILE_COMPILE    2
 100
 101 struct magic {
 102         /* Word 1 */
 103         uint16_t cont_level;    /* level of ">" */
 104         uint8_t nospflag;       /* supress space character */
 105         uint8_t flag;
 106 #define INDIR           1       /* if '(...)' appears */
 107 #define OFFADD          2       /* if '>&' or '>...(&' appears */
 108 #define INDIROFFADD     4       /* if '>&(' appears */
 109 #define UNSIGNED        8       /* comparison is unsigned */
 110
 111         /* Word 2 */
 112         uint8_t reln;           /* relation (0=eq, '>'=gt, etc) */
 113         uint8_t vallen;         /* length of string value, if any */
 114         uint8_t type;           /* int, short, long or string. */
 115         uint8_t in_type;        /* type of indirrection */
 116 #define                         FILE_INVALID    0
 117 #define                         FILE_BYTE       1
 118 #define                         FILE_SHORT      2
 119 #define                         FILE_DEFAULT    3
 120 #define                         FILE_LONG       4
 121 #define                         FILE_STRING     5
 122 #define                         FILE_DATE       6
 123 #define                         FILE_BESHORT    7
 124 #define                         FILE_BELONG     8
 125 #define                         FILE_BEDATE     9
 126 #define                         FILE_LESHORT    10
 127 #define                         FILE_LELONG     11
 128 #define                         FILE_LEDATE     12
 129 #define                         FILE_PSTRING    13
 130 #define                         FILE_LDATE      14
 131 #define                         FILE_BELDATE    15
 132 #define                         FILE_LELDATE    16
 133 #define                         FILE_REGEX      17
 134 #define                         FILE_BESTRING16 18
 135 #define                         FILE_LESTRING16 19
 136 #define                         FILE_SEARCH     20
 137 #define                         FILE_MEDATE     21
 138 #define                         FILE_MELDATE    22
 139 #define                         FILE_MELONG     23
 140 #define                         FILE_QUAD       24
 141 #define                         FILE_LEQUAD     25
 142 #define                         FILE_BEQUAD     26
 143 #define                         FILE_QDATE      27
 144 #define                         FILE_LEQDATE    28
 145 #define                         FILE_BEQDATE    29
 146 #define                         FILE_QLDATE     30
 147 #define                         FILE_LEQLDATE   31
 148 #define                         FILE_BEQLDATE   32
 149 #define                         FILE_FLOAT      33
 150 #define                         FILE_BEFLOAT    34
 151 #define                         FILE_LEFLOAT    35
 152 #define                         FILE_DOUBLE     36
 153 #define                         FILE_BEDOUBLE   37
 154 #define                         FILE_LEDOUBLE   38
 155 #define                         FILE_NAMES_SIZE 39/* size of array to contain all names */
 156
 157 #define IS_STRING(t) \
 158         ((t) == FILE_STRING || \
 159          (t) == FILE_PSTRING || \
 160          (t) == FILE_BESTRING16 || \
 161          (t) == FILE_LESTRING16 || \
 162          (t) == FILE_REGEX || \
 163          (t) == FILE_SEARCH || \
 164          (t) == FILE_DEFAULT)
 165
 166 #define FILE_FMT_NONE 0
 167 #define FILE_FMT_NUM  1 /* "cduxXi" */
 168 #define FILE_FMT_STR  2 /* "s" */
 169 #define FILE_FMT_QUAD 3 /* "ll" */
 170 #define FILE_FMT_FLOAT 4 /* "eEfFgG" */
 171 #define FILE_FMT_DOUBLE 5 /* "eEfFgG" */
 172
 173         /* Word 3 */
 174         uint8_t in_op;          /* operator for indirection */
 175         uint8_t mask_op;        /* operator for mask */
 176 #ifdef ENABLE_CONDITIONALS
 177         uint8_t cond;           /* conditional type */
 178         uint8_t dummy1;
 179 #else
 180         uint8_t dummy1;
 181         uint8_t dummy2;
 182 #endif
 183
 184 #define                         FILE_OPS        "&|^+-*/%"
 185 #define                         FILE_OPAND      0
 186 #define                         FILE_OPOR       1
 187 #define                         FILE_OPXOR      2
 188 #define                         FILE_OPADD      3
 189 #define                         FILE_OPMINUS    4
 190 #define                         FILE_OPMULTIPLY 5
 191 #define                         FILE_OPDIVIDE   6
 192 #define                         FILE_OPMODULO   7
 193 #define                         FILE_OPS_MASK   0x07 /* mask for above ops */
 194 #define                         FILE_UNUSED_1   0x08
 195 #define                         FILE_UNUSED_2   0x10
 196 #define                         FILE_UNUSED_3   0x20
 197 #define                         FILE_OPINVERSE  0x40
 198 #define                         FILE_OPINDIRECT 0x80
 199
 200 #ifdef ENABLE_CONDITIONALS
 201 #define                         COND_NONE       0
 202 #define                         COND_IF         1
 203 #define                         COND_ELIF       2
 204 #define                         COND_ELSE       3
 205 #endif /* ENABLE_CONDITIONALS */
 206
 207         /* Word 4 */
 208         uint32_t offset;        /* offset to magic number */
 209         /* Word 5 */
 210         int32_t in_offset;      /* offset from indirection */
 211         /* Word 6 */
 212         uint32_t lineno;        /* line number in magic file */
 213         /* Word 7,8 */
 214         union {
 215                 uint64_t _mask; /* for use with numeric and date types */
 216                 struct {
 217                         uint32_t _count;        /* repeat/line count */
 218                         uint32_t _flags;        /* modifier flags */
 219                 } _s;           /* for use with string types */
 220         } _u;
 221 #define num_mask _u._mask
 222 #define str_count _u._s._count
 223 #define str_flags _u._s._flags
 224
 225         /* Words 9-16 */
 226         union VALUETYPE {
 227                 uint8_t b;
 228                 uint16_t h;
 229                 uint32_t l;
 230                 uint64_t q;
 231                 uint8_t hs[2];  /* 2 bytes of a fixed-endian "short" */
 232                 uint8_t hl[4];  /* 4 bytes of a fixed-endian "long" */
 233                 uint8_t hq[8];  /* 8 bytes of a fixed-endian "quad" */
 234                 char s[MAXstring];      /* the search string or regex pattern */
 235                 float f;
 236                 double d;
 237         } value;                /* either number or string */
 238         /* Words 17..31 */
 239         char desc[MAXDESC];     /* description */
 240 };
 241
 242 #define BIT(A)   (1 << (A))
 243 #define STRING_COMPACT_BLANK            BIT(0)
 244 #define STRING_COMPACT_OPTIONAL_BLANK   BIT(1)
 245 #define STRING_IGNORE_LOWERCASE         BIT(2)
 246 #define STRING_IGNORE_UPPERCASE         BIT(3)
 247 #define REGEX_OFFSET_START              BIT(4)
 248 #define CHAR_COMPACT_BLANK              'B'
 249 #define CHAR_COMPACT_OPTIONAL_BLANK     'b'
 250 #define CHAR_IGNORE_LOWERCASE           'c'
 251 #define CHAR_IGNORE_UPPERCASE           'C'
 252 #define CHAR_REGEX_OFFSET_START         's'
 253 #define STRING_IGNORE_CASE              (STRING_IGNORE_LOWERCASE|STRING_IGNORE_UPPERCASE)
 254
 255
 256 /* list of magic entries */
 257 struct mlist {
 258         struct magic *magic;            /* array of magic entries */
 259         uint32_t nmagic;                        /* number of entries in array */
 260         int mapped;  /* allocation type: 0 => apprentice_file
 261                       *                  1 => apprentice_map + malloc
 262                       *                  2 => apprentice_map + mmap */
 263         struct mlist *next, *prev;
 264 };
 265
 266 struct magic_set {
 267         struct mlist *mlist;
 268         struct cont {
 269                 size_t len;
 270                 struct level_info {
 271                         int32_t off;
 272                         int got_match;
 273 #ifdef ENABLE_CONDITIONALS
 274                         int last_match;
 275                         int last_cond;  /* used for error checking by parse() */
 276 #endif
 277                 } *li;
 278         } c;
 279         struct out {
 280                 /* Accumulation buffer */
 281                 char *buf;
 282                 char *ptr;
 283                 size_t left;
 284                 size_t size;
 285                 /* Printable buffer */
 286                 char *pbuf;
 287                 size_t psize;
 288         } o;
 289         uint32_t offset;
 290         int error;
 291         int flags;
 292         int haderr;
 293         const char *file;
 294         size_t line;                    /* current magic line number */
 295
 296         /* data for searches */
 297         struct {
 298                 const char *s;          /* start of search in original source */
 299                 size_t s_len;           /* length of search region */
 300                 size_t offset;          /* starting offset in source: XXX - should this be off_t? */
 301                 size_t rm_len;          /* match length */
 302         } search;
 303
 304         union VALUETYPE ms_value;       /* either number or string */
 305 };
 306
 307 struct stat;
 308 protected const char *file_fmttime(uint32_t, int);
 309 protected int file_buffer(struct magic_set *, int, const char *, const void *,
 310     size_t);
 311 protected int file_fsmagic(struct magic_set *, const char *, struct stat *);
 312 protected int file_pipe2file(struct magic_set *, int, const void *, size_t);
 313 protected int file_printf(struct magic_set *, const char *, ...);
 314 protected int file_reset(struct magic_set *);
 315 protected int file_tryelf(struct magic_set *, int, const unsigned char *,
 316     size_t);
 317 protected int file_zmagic(struct magic_set *, int, const char *,
 318     const unsigned char *, size_t);
 319 protected int file_ascmagic(struct magic_set *, const unsigned char *, size_t);
 320 protected int file_is_tar(struct magic_set *, const unsigned char *, size_t);
 321 protected int file_softmagic(struct magic_set *, const unsigned char *, size_t);
 322 protected struct mlist *file_apprentice(struct magic_set *, const char *, int);
 323 protected uint64_t file_signextend(struct magic_set *, struct magic *,
 324     uint64_t);
 325 protected void file_delmagic(struct magic *, int type, size_t entries);
 326 protected void file_badread(struct magic_set *);
 327 protected void file_badseek(struct magic_set *);
 328 protected void file_oomem(struct magic_set *, size_t);
 329 protected void file_error(struct magic_set *, int, const char *, ...);
 330 protected void file_magerror(struct magic_set *, const char *, ...);
 331 protected void file_magwarn(struct magic_set *, const char *, ...);
 332 protected void file_mdump(struct magic *);
 333 protected void file_showstr(FILE *, const char *, size_t);
 334 protected size_t file_mbswidth(const char *);
 335 protected const char *file_getbuffer(struct magic_set *);
 336 protected ssize_t sread(int, void *, size_t, int);
 337 protected int file_check_mem(struct magic_set *, unsigned int);
 338
 339 #ifndef COMPILE_ONLY
 340 extern const char *file_names[];
 341 extern const size_t file_nnames;
 342 #endif
 343
 344 #ifndef HAVE_STRERROR
 345 extern int sys_nerr;
 346 extern char *sys_errlist[];
 347 #define strerror(e) \
 348         (((e) >= 0 && (e) < sys_nerr) ? sys_errlist[(e)] : "Unknown error")
 349 #endif
 350
 351 #ifndef HAVE_STRTOUL
 352 #define strtoul(a, b, c)        strtol(a, b, c)
 353 #endif
 354
 355 #ifndef HAVE_SNPRINTF
 356 int snprintf(char *, size_t, const char *, ...);
 357 #endif
 358
 359 #if defined(HAVE_MMAP) && defined(HAVE_SYS_MMAN_H) && !defined(QUICK)
 360 #define QUICK
 361 #endif
 362
 363 #ifndef O_BINARY
 364 #define O_BINARY        0
 365 #endif
 366
 367 #define FILE_RCSID(id) \
 368 static const char *rcsid(const char *p) { \
 369         return rcsid(p = id); \
 370 }
 371
 372 #endif /* __file_h__ */