bda6cdf589
*- file is now broken into a library containing and processing the magic and a consumer binary.
286 lines
8.6 KiB
C
286 lines
8.6 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Ian F. Darwin and others.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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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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* @(#)$Id: file.h,v 1.61 2004/05/12 14:53:01 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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#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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/* 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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#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 HOWMANY
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# define HOWMANY 65536 /* how much of the file to look at */
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#endif
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#define MAXMAGIS 4096 /* 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 2
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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 UNSIGNED 2 /* comparison is unsigned */
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#define OFFADD 4 /* if '>&' appears, */
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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_BYTE 1
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#define FILE_SHORT 2
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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_FORMAT_NAME \
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/* 0 */ "invalid 0", \
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/* 1 */ "byte", \
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/* 2 */ "short", \
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/* 3 */ "invalid 3", \
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/* 4 */ "long", \
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/* 5 */ "string", \
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/* 6 */ "date", \
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/* 7 */ "beshort", \
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/* 8 */ "belong", \
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/* 9 */ "bedate" \
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/* 10 */ "leshort", \
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/* 11 */ "lelong", \
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/* 12 */ "ledate", \
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/* 13 */ "pstring", \
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/* 14 */ "ldate", \
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/* 15 */ "beldate", \
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/* 16 */ "leldate", \
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/* 17 */ "regex",
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#define FILE_FMT_NUM "cduxXi"
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#define FILE_FMT_STR "s"
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#define FILE_FORMAT_STRING \
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/* 0 */ NULL, \
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/* 1 */ FILE_FMT_NUM, \
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/* 2 */ FILE_FMT_NUM, \
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/* 3 */ NULL, \
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/* 4 */ FILE_FMT_NUM, \
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/* 5 */ FILE_FMT_STR, \
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/* 6 */ FILE_FMT_STR, \
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/* 7 */ FILE_FMT_NUM, \
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/* 8 */ FILE_FMT_NUM, \
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/* 9 */ FILE_FMT_STR, \
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/* 10 */ FILE_FMT_NUM, \
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/* 11 */ FILE_FMT_NUM, \
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/* 12 */ FILE_FMT_STR, \
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/* 13 */ FILE_FMT_STR, \
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/* 14 */ FILE_FMT_STR, \
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/* 15 */ FILE_FMT_STR, \
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/* 16 */ FILE_FMT_STR, \
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/* 17 */ FILE_FMT_STR,
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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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uint8_t dummy1;
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uint8_t dummy2;
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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_OPINVERSE 0x80
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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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uint32_t in_offset; /* offset from indirection */
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/* Word 6 */
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uint32_t mask; /* mask before comparison with value */
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/* Word 7 */
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uint32_t dummy3;
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/* Word 8 */
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uint32_t dummp4;
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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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char s[MAXstring];
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char *buf;
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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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} 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_IGNORE_LOWERCASE BIT(0)
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#define STRING_COMPACT_BLANK BIT(1)
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#define STRING_COMPACT_OPTIONAL_BLANK BIT(2)
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#define CHAR_IGNORE_LOWERCASE 'c'
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#define CHAR_COMPACT_BLANK 'B'
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#define CHAR_COMPACT_OPTIONAL_BLANK 'b'
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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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int32_t *off;
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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 len;
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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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int error;
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int flags;
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int haderr;
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};
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struct stat;
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protected char *file_fmttime(uint32_t, int);
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protected int file_buffer(struct magic_set *, const void *, 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 *, size_t);
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protected int file_zmagic(struct magic_set *, 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 uint32_t file_signextend(struct magic_set *, struct magic *, uint32_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 *);
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protected void file_error(struct magic_set *, int, const char *, ...);
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protected void file_magwarn(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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#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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#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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#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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#else
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#endif /* __file_h__ */
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