363 lines
10 KiB
C
363 lines
10 KiB
C
/*
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* Copyright (c) Ian F. Darwin 1986-1995.
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* Software written by Ian F. Darwin and others;
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* maintained 1995-present by Christos Zoulas and others.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* file.h - definitions for file(1) program
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* @(#)$File: file.h,v 1.91 2007/03/25 03:13:47 christos Exp $
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*/
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#ifndef __file_h__
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#define __file_h__
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h> /* Include that here, to make sure __P gets defined */
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#include <errno.h>
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#include <fcntl.h> /* For open and flags */
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#ifdef HAVE_INTTYPES_H
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#include <inttypes.h>
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#endif
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#include <regex.h>
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#include <sys/types.h>
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/* Do this here and now, because struct stat gets re-defined on solaris */
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#include <sys/stat.h>
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#define ENABLE_CONDITIONALS
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#ifndef MAGIC
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#define MAGIC "/etc/magic"
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#endif
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#ifdef __EMX__
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#define PATHSEP ';'
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#else
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#define PATHSEP ':'
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#endif
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#define private static
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#ifndef protected
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#define protected
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#endif
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#define public
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#ifndef __GNUC_PREREQ__
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#ifdef __GNUC__
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#define __GNUC_PREREQ__(x, y) \
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((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) || \
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(__GNUC__ > (x)))
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#else
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#define __GNUC_PREREQ__(x, y) 0
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#endif
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#endif
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#ifndef MIN
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#define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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#ifndef HOWMANY
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# define HOWMANY (256 * 1024) /* how much of the file to look at */
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#endif
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#define MAXMAGIS 8192 /* max entries in /etc/magic */
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#define MAXDESC 64 /* max leng of text description */
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#define MAXstring 32 /* max leng of "string" types */
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#define MAGICNO 0xF11E041C
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#define VERSIONNO 4
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#define FILE_MAGICSIZE (32 * 4)
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#define FILE_LOAD 0
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#define FILE_CHECK 1
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#define FILE_COMPILE 2
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struct magic {
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/* Word 1 */
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uint16_t cont_level; /* level of ">" */
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uint8_t nospflag; /* supress space character */
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uint8_t flag;
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#define INDIR 1 /* if '(...)' appears */
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#define OFFADD 2 /* if '>&' or '>...(&' appears */
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#define INDIROFFADD 4 /* if '>&(' appears */
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#define UNSIGNED 8 /* comparison is unsigned */
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/* Word 2 */
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uint8_t reln; /* relation (0=eq, '>'=gt, etc) */
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uint8_t vallen; /* length of string value, if any */
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uint8_t type; /* int, short, long or string. */
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uint8_t in_type; /* type of indirrection */
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#define FILE_INVALID 0
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#define FILE_BYTE 1
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#define FILE_SHORT 2
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#define FILE_DEFAULT 3
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#define FILE_LONG 4
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#define FILE_STRING 5
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#define FILE_DATE 6
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#define FILE_BESHORT 7
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#define FILE_BELONG 8
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#define FILE_BEDATE 9
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#define FILE_LESHORT 10
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#define FILE_LELONG 11
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#define FILE_LEDATE 12
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#define FILE_PSTRING 13
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#define FILE_LDATE 14
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#define FILE_BELDATE 15
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#define FILE_LELDATE 16
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#define FILE_REGEX 17
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#define FILE_BESTRING16 18
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#define FILE_LESTRING16 19
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#define FILE_SEARCH 20
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#define FILE_MEDATE 21
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#define FILE_MELDATE 22
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#define FILE_MELONG 23
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#define FILE_QUAD 24
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#define FILE_LEQUAD 25
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#define FILE_BEQUAD 26
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#define FILE_QDATE 27
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#define FILE_LEQDATE 28
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#define FILE_BEQDATE 29
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#define FILE_QLDATE 30
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#define FILE_LEQLDATE 31
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#define FILE_BEQLDATE 32
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#define FILE_NAMES_SIZE 33/* size of array to contain all names */
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#define IS_STRING(t) \
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((t) == FILE_STRING || \
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(t) == FILE_PSTRING || \
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(t) == FILE_BESTRING16 || \
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(t) == FILE_LESTRING16 || \
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(t) == FILE_REGEX || \
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(t) == FILE_SEARCH || \
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(t) == FILE_DEFAULT)
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#define FILE_FMT_NONE 0
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#define FILE_FMT_NUM 1 /* "cduxXi" */
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#define FILE_FMT_STR 2 /* "s" */
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#define FILE_FMT_QUAD 3 /* "ll" */
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/* Word 3 */
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uint8_t in_op; /* operator for indirection */
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uint8_t mask_op; /* operator for mask */
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#ifdef ENABLE_CONDITIONALS
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uint8_t cond; /* conditional type */
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uint8_t dummy1;
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#else
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uint8_t dummy1;
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uint8_t dummy2;
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#endif
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#define FILE_OPS "&|^+-*/%"
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#define FILE_OPAND 0
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#define FILE_OPOR 1
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#define FILE_OPXOR 2
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#define FILE_OPADD 3
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#define FILE_OPMINUS 4
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#define FILE_OPMULTIPLY 5
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#define FILE_OPDIVIDE 6
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#define FILE_OPMODULO 7
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#define FILE_OPS_MASK 0x07 /* mask for above ops */
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#define FILE_UNUSED_1 0x08
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#define FILE_UNUSED_2 0x10
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#define FILE_UNUSED_3 0x20
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#define FILE_OPINVERSE 0x40
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#define FILE_OPINDIRECT 0x80
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#ifdef ENABLE_CONDITIONALS
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#define COND_NONE 0
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#define COND_IF 1
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#define COND_ELIF 2
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#define COND_ELSE 3
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#endif /* ENABLE_CONDITIONALS */
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/* Word 4 */
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uint32_t offset; /* offset to magic number */
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/* Word 5 */
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int32_t in_offset; /* offset from indirection */
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/* Word 6 */
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uint32_t lineno; /* line number in magic file */
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/* Word 7,8 */
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union {
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uint64_t _mask; /* for use with numeric and date types */
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struct {
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uint32_t _count; /* repeat/line count */
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uint32_t _flags; /* modifier flags */
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} _s; /* for use with string types */
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} _u;
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#define num_mask _u._mask
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#define str_count _u._s._count
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#define str_flags _u._s._flags
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/* Words 9-16 */
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union VALUETYPE {
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uint8_t b;
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uint16_t h;
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uint32_t l;
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uint64_t q;
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uint8_t hs[2]; /* 2 bytes of a fixed-endian "short" */
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uint8_t hl[4]; /* 4 bytes of a fixed-endian "long" */
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uint8_t hq[8]; /* 8 bytes of a fixed-endian "quad" */
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char s[MAXstring]; /* the search string or regex pattern */
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} value; /* either number or string */
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/* Words 17..31 */
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char desc[MAXDESC]; /* description */
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};
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#define BIT(A) (1 << (A))
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#define STRING_COMPACT_BLANK BIT(0)
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#define STRING_COMPACT_OPTIONAL_BLANK BIT(1)
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#define STRING_IGNORE_LOWERCASE BIT(2)
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#define STRING_IGNORE_UPPERCASE BIT(3)
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#define REGEX_OFFSET_START BIT(4)
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#define CHAR_COMPACT_BLANK 'B'
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#define CHAR_COMPACT_OPTIONAL_BLANK 'b'
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#define CHAR_IGNORE_LOWERCASE 'c'
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#define CHAR_IGNORE_UPPERCASE 'C'
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#define CHAR_REGEX_OFFSET_START 's'
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#define STRING_IGNORE_CASE (STRING_IGNORE_LOWERCASE|STRING_IGNORE_UPPERCASE)
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/* list of magic entries */
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struct mlist {
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struct magic *magic; /* array of magic entries */
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uint32_t nmagic; /* number of entries in array */
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int mapped; /* allocation type: 0 => apprentice_file
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* 1 => apprentice_map + malloc
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* 2 => apprentice_map + mmap */
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struct mlist *next, *prev;
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};
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struct magic_set {
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struct mlist *mlist;
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struct cont {
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size_t len;
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struct level_info {
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int32_t off;
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int got_match;
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#ifdef ENABLE_CONDITIONALS
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int last_match;
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int last_cond; /* used for error checking by parse() */
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#endif
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} *li;
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} c;
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struct out {
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/* Accumulation buffer */
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char *buf;
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char *ptr;
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size_t left;
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size_t size;
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/* Printable buffer */
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char *pbuf;
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size_t psize;
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} o;
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uint32_t offset;
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int error;
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int flags;
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int haderr;
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const char *file;
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size_t line; /* current magic line number */
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/* data for searches */
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struct {
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const char *s; /* start of search in original source */
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size_t s_len; /* length of search region */
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size_t offset; /* starting offset in source: XXX - should this be off_t? */
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size_t rm_len; /* match length */
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} search;
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union VALUETYPE ms_value; /* either number or string */
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};
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struct stat;
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protected const char *file_fmttime(uint32_t, int);
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protected int file_buffer(struct magic_set *, int, const char *, const void *,
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size_t);
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protected int file_fsmagic(struct magic_set *, const char *, struct stat *);
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protected int file_pipe2file(struct magic_set *, int, const void *, size_t);
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protected int file_printf(struct magic_set *, const char *, ...);
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protected int file_reset(struct magic_set *);
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protected int file_tryelf(struct magic_set *, int, const unsigned char *,
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size_t);
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protected int file_zmagic(struct magic_set *, int, const char *,
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const unsigned char *, size_t);
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protected int file_ascmagic(struct magic_set *, const unsigned char *, size_t);
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protected int file_is_tar(struct magic_set *, const unsigned char *, size_t);
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protected int file_softmagic(struct magic_set *, const unsigned char *, size_t);
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protected struct mlist *file_apprentice(struct magic_set *, const char *, int);
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protected uint64_t file_signextend(struct magic_set *, struct magic *,
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uint64_t);
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protected void file_delmagic(struct magic *, int type, size_t entries);
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protected void file_badread(struct magic_set *);
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protected void file_badseek(struct magic_set *);
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protected void file_oomem(struct magic_set *, size_t);
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protected void file_error(struct magic_set *, int, const char *, ...);
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protected void file_magerror(struct magic_set *, const char *, ...);
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protected void file_magwarn(struct magic_set *, const char *, ...);
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protected void file_mdump(struct magic *);
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protected void file_showstr(FILE *, const char *, size_t);
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protected size_t file_mbswidth(const char *);
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protected const char *file_getbuffer(struct magic_set *);
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protected ssize_t sread(int, void *, size_t, int);
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protected int file_check_mem(struct magic_set *, unsigned int);
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#ifndef COMPILE_ONLY
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extern const char *file_names[];
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extern const size_t file_nnames;
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#endif
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#ifndef HAVE_STRERROR
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extern int sys_nerr;
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extern char *sys_errlist[];
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#define strerror(e) \
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(((e) >= 0 && (e) < sys_nerr) ? sys_errlist[(e)] : "Unknown error")
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#endif
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#ifndef HAVE_STRTOUL
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#define strtoul(a, b, c) strtol(a, b, c)
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#endif
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#ifndef HAVE_SNPRINTF
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int snprintf(char *, size_t, const char *, ...);
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#endif
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#if defined(HAVE_MMAP) && defined(HAVE_SYS_MMAN_H) && !defined(QUICK)
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#define QUICK
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#endif
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#define FILE_RCSID(id) \
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static const char *rcsid(const char *p) { \
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return rcsid(p = id); \
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}
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#endif /* __file_h__ */
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