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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
29 * apprentice - make one pass through /etc/magic, learning its secrets.
34 #include "patchlevel.h"
44 #include <sys/param.h>
50 FILE_RCSID("@(#)$File: apprentice.c,v 1.109 2007/12/27 20:52:36 christos Exp $")
53 #define EATAB {while (isascii((unsigned char) *l) && \
54 isspace((unsigned char) *l)) ++l;}
55 #define LOWCASE(l) (isupper((unsigned char) (l)) ? \
56 tolower((unsigned char) (l)) : (l))
58 * Work around a bug in headers on Digital Unix.
59 * At least confirmed for: OSF1 V4.0 878
61 #if defined(__osf__) && defined(__DECC)
68 #define MAP_FAILED (void *) -1
76 #define MAXPATHLEN 1024
85 int file_formats
[FILE_NAMES_SIZE
];
86 const size_t file_nformats
= FILE_NAMES_SIZE
;
87 const char *file_names
[FILE_NAMES_SIZE
];
88 const size_t file_nnames
= FILE_NAMES_SIZE
;
90 private int getvalue(struct magic_set
*ms
, struct magic
*, const char **, int);
91 private int hextoint(int);
92 private const char *getstr(struct magic_set
*, const char *, char *, int,
94 private int parse(struct magic_set
*, struct magic_entry
**, uint32_t *,
95 const char *, size_t, int);
96 private void eatsize(const char **);
97 private int apprentice_1(struct magic_set
*, const char *, int, struct mlist
*);
98 private size_t apprentice_magic_strength(const struct magic
*);
99 private int apprentice_sort(const void *, const void *);
100 private int apprentice_file(struct magic_set
*, struct magic
**, uint32_t *,
102 private void byteswap(struct magic
*, uint32_t);
103 private void bs1(struct magic
*);
104 private uint16_t swap2(uint16_t);
105 private uint32_t swap4(uint32_t);
106 private uint64_t swap8(uint64_t);
107 private char *mkdbname(const char *, char *, size_t, int);
108 private int apprentice_map(struct magic_set
*, struct magic
**, uint32_t *,
110 private int apprentice_compile(struct magic_set
*, struct magic
**, uint32_t *,
112 private int check_format_type(const char *, int);
113 private int check_format(struct magic_set
*, struct magic
*);
114 private int get_op(char);
116 private size_t maxmagic
= 0;
117 private size_t magicsize
= sizeof(struct magic
);
122 int main(int, char *[]);
125 main(int argc
, char *argv
[])
128 struct magic_set
*ms
;
131 if ((progname
= strrchr(argv
[0], '/')) != NULL
)
137 (void)fprintf(stderr
, "Usage: %s file\n", progname
);
141 if ((ms
= magic_open(MAGIC_CHECK
)) == NULL
) {
142 (void)fprintf(stderr
, "%s: %s\n", progname
, strerror(errno
));
145 ret
= magic_compile(ms
, argv
[1]) == -1 ? 1 : 0;
147 (void)fprintf(stderr
, "%s: %s\n", progname
, magic_error(ms
));
151 #endif /* COMPILE_ONLY */
153 static const struct type_tbl_s
{
159 # define XX(s) s, (sizeof(s) - 1)
160 # define XX_NULL NULL, 0
161 { XX("byte"), FILE_BYTE
, FILE_FMT_NUM
},
162 { XX("short"), FILE_SHORT
, FILE_FMT_NUM
},
163 { XX("default"), FILE_DEFAULT
, FILE_FMT_STR
},
164 { XX("long"), FILE_LONG
, FILE_FMT_NUM
},
165 { XX("string"), FILE_STRING
, FILE_FMT_STR
},
166 { XX("date"), FILE_DATE
, FILE_FMT_STR
},
167 { XX("beshort"), FILE_BESHORT
, FILE_FMT_NUM
},
168 { XX("belong"), FILE_BELONG
, FILE_FMT_NUM
},
169 { XX("bedate"), FILE_BEDATE
, FILE_FMT_STR
},
170 { XX("leshort"), FILE_LESHORT
, FILE_FMT_NUM
},
171 { XX("lelong"), FILE_LELONG
, FILE_FMT_NUM
},
172 { XX("ledate"), FILE_LEDATE
, FILE_FMT_STR
},
173 { XX("pstring"), FILE_PSTRING
, FILE_FMT_STR
},
174 { XX("ldate"), FILE_LDATE
, FILE_FMT_STR
},
175 { XX("beldate"), FILE_BELDATE
, FILE_FMT_STR
},
176 { XX("leldate"), FILE_LELDATE
, FILE_FMT_STR
},
177 { XX("regex"), FILE_REGEX
, FILE_FMT_STR
},
178 { XX("bestring16"), FILE_BESTRING16
, FILE_FMT_STR
},
179 { XX("lestring16"), FILE_LESTRING16
, FILE_FMT_STR
},
180 { XX("search"), FILE_SEARCH
, FILE_FMT_STR
},
181 { XX("medate"), FILE_MEDATE
, FILE_FMT_STR
},
182 { XX("meldate"), FILE_MELDATE
, FILE_FMT_STR
},
183 { XX("melong"), FILE_MELONG
, FILE_FMT_NUM
},
184 { XX("quad"), FILE_QUAD
, FILE_FMT_QUAD
},
185 { XX("lequad"), FILE_LEQUAD
, FILE_FMT_QUAD
},
186 { XX("bequad"), FILE_BEQUAD
, FILE_FMT_QUAD
},
187 { XX("qdate"), FILE_QDATE
, FILE_FMT_STR
},
188 { XX("leqdate"), FILE_LEQDATE
, FILE_FMT_STR
},
189 { XX("beqdate"), FILE_BEQDATE
, FILE_FMT_STR
},
190 { XX("qldate"), FILE_QLDATE
, FILE_FMT_STR
},
191 { XX("leqldate"), FILE_LEQLDATE
, FILE_FMT_STR
},
192 { XX("beqldate"), FILE_BEQLDATE
, FILE_FMT_STR
},
193 { XX("float"), FILE_FLOAT
, FILE_FMT_FLOAT
},
194 { XX("befloat"), FILE_BEFLOAT
, FILE_FMT_FLOAT
},
195 { XX("lefloat"), FILE_LEFLOAT
, FILE_FMT_FLOAT
},
196 { XX("double"), FILE_DOUBLE
, FILE_FMT_DOUBLE
},
197 { XX("bedouble"), FILE_BEDOUBLE
, FILE_FMT_DOUBLE
},
198 { XX("ledouble"), FILE_LEDOUBLE
, FILE_FMT_DOUBLE
},
199 { XX_NULL
, FILE_INVALID
, FILE_FMT_NONE
},
205 get_type(const char *l
, const char **t
)
207 const struct type_tbl_s
*p
;
209 for (p
= type_tbl
; p
->name
; p
++) {
210 if (strncmp(l
, p
->name
, p
->len
) == 0) {
220 init_file_tables(void)
223 const struct type_tbl_s
*p
;
229 for (p
= type_tbl
; p
->name
; p
++) {
230 assert(p
->type
< FILE_NAMES_SIZE
);
231 file_names
[p
->type
] = p
->name
;
232 file_formats
[p
->type
] = p
->format
;
240 apprentice_1(struct magic_set
*ms
, const char *fn
, int action
,
243 struct magic
*magic
= NULL
;
249 if (magicsize
!= FILE_MAGICSIZE
) {
250 file_error(ms
, 0, "magic element size %lu != %lu",
251 (unsigned long)sizeof(*magic
),
252 (unsigned long)FILE_MAGICSIZE
);
256 if (action
== FILE_COMPILE
) {
257 rv
= apprentice_file(ms
, &magic
, &nmagic
, fn
, action
);
260 rv
= apprentice_compile(ms
, &magic
, &nmagic
, fn
);
266 if ((rv
= apprentice_map(ms
, &magic
, &nmagic
, fn
)) == -1) {
267 if (ms
->flags
& MAGIC_CHECK
)
268 file_magwarn(ms
, "using regular magic file `%s'", fn
);
269 rv
= apprentice_file(ms
, &magic
, &nmagic
, fn
, action
);
276 if (magic
== NULL
|| nmagic
== 0) {
277 file_delmagic(magic
, mapped
, nmagic
);
281 if ((ml
= malloc(sizeof(*ml
))) == NULL
) {
282 file_delmagic(magic
, mapped
, nmagic
);
283 file_oomem(ms
, sizeof(*ml
));
291 mlist
->prev
->next
= ml
;
292 ml
->prev
= mlist
->prev
;
297 #endif /* COMPILE_ONLY */
301 file_delmagic(struct magic
*p
, int type
, size_t entries
)
309 (void)munmap((void *)p
, sizeof(*p
) * (entries
+ 1));
323 /* const char *fn: list of magic files */
324 protected struct mlist
*
325 file_apprentice(struct magic_set
*ms
, const char *fn
, int action
)
327 char *p
, *mfn
, *afn
= NULL
;
328 int file_err
, errs
= -1;
330 static const char mime
[] = ".mime";
335 fn
= getenv("MAGIC");
339 if ((mfn
= strdup(fn
)) == NULL
) {
340 file_oomem(ms
, strlen(fn
));
345 if ((mlist
= malloc(sizeof(*mlist
))) == NULL
) {
347 file_oomem(ms
, sizeof(*mlist
));
350 mlist
->next
= mlist
->prev
= mlist
;
353 p
= strchr(fn
, PATHSEP
);
358 if (ms
->flags
& MAGIC_MIME
) {
359 size_t len
= strlen(fn
) + sizeof(mime
);
360 if ((afn
= malloc(len
)) == NULL
) {
366 (void)strcpy(afn
, fn
);
367 (void)strcat(afn
, mime
);
370 file_err
= apprentice_1(ms
, fn
, action
, mlist
);
383 file_error(ms
, 0, "could not find any magic files!");
391 * Get weight of this magic entry, for sorting purposes.
394 apprentice_magic_strength(const struct magic
*m
)
397 size_t val
= 2 * MULT
; /* baseline strength */
400 case FILE_DEFAULT
: /* make sure this sorts last */
422 val
+= m
->vallen
* MULT
;
425 case FILE_BESTRING16
:
426 case FILE_LESTRING16
:
427 val
+= m
->vallen
* MULT
/ 2;
466 (void)fprintf(stderr
, "Bad type %d\n", m
->type
);
471 case 'x': /* matches anything penalize */
476 case '=': /* Exact match, prefer */
481 case '<': /* comparison match reduce strength */
486 case '&': /* masking bits, we could count them too */
491 (void)fprintf(stderr
, "Bad relation %c\n", m
->reln
);
495 if (val
== 0) /* ensure we only return 0 for FILE_DEFAULT */
502 * Sort callback for sorting entries by "strength" (basically length)
505 apprentice_sort(const void *a
, const void *b
)
507 const struct magic_entry
*ma
= a
;
508 const struct magic_entry
*mb
= b
;
509 size_t sa
= apprentice_magic_strength(ma
->mp
);
510 size_t sb
= apprentice_magic_strength(mb
->mp
);
521 * const char *fn: name of magic file
524 apprentice_file(struct magic_set
*ms
, struct magic
**magicp
, uint32_t *nmagicp
,
525 const char *fn
, int action
)
527 private const char hdr
[] =
528 "cont\toffset\ttype\topcode\tmask\tvalue\tdesc";
532 struct magic_entry
*marray
;
533 uint32_t marraycount
, i
, mentrycount
= 0;
536 ms
->flags
|= MAGIC_CHECK
; /* Enable checks for parsed files */
538 f
= fopen(ms
->file
= fn
, "r");
541 file_error(ms
, errno
, "cannot read magic file `%s'",
547 if ((marray
= calloc(maxmagic
, sizeof(*marray
))) == NULL
) {
549 file_oomem(ms
, maxmagic
* sizeof(*marray
));
554 /* print silly verbose header for USG compat. */
555 if (action
== FILE_CHECK
)
556 (void)fprintf(stderr
, "%s\n", hdr
);
558 /* read and parse this file */
559 for (ms
->line
= 1; fgets(line
, sizeof(line
), f
) != NULL
; ms
->line
++) {
562 if (len
== 0) /* null line, garbage, etc */
564 if (line
[len
- 1] == '\n') {
566 line
[len
- 1] = '\0'; /* delete newline */
568 if (line
[0] == '\0') /* empty, do not parse */
570 if (line
[0] == '#') /* comment, do not parse */
572 if (parse(ms
, &marray
, &marraycount
, line
, lineno
, action
) != 0)
581 qsort(marray
, marraycount
, sizeof(*marray
), apprentice_sort
);
583 * Make sure that any level 0 "default" line is last (if one exists).
585 for (i
= 0; i
< marraycount
; i
++) {
586 if (marray
[i
].mp
->cont_level
== 0 &&
587 marray
[i
].mp
->type
== FILE_DEFAULT
) {
588 while (++i
< marraycount
)
589 if (marray
[i
].mp
->cont_level
== 0)
591 if (i
!= marraycount
) {
592 ms
->line
= marray
[i
].mp
->lineno
; /* XXX - Ugh! */
594 "level 0 \"default\" did not sort last");
601 for (i
= 0; i
< marraycount
; i
++)
602 mentrycount
+= marray
[i
].cont_count
;
604 if ((*magicp
= malloc(sizeof(**magicp
) * mentrycount
)) == NULL
) {
605 file_oomem(ms
, sizeof(**magicp
) * mentrycount
);
611 for (i
= 0; i
< marraycount
; i
++) {
612 (void)memcpy(*magicp
+ mentrycount
, marray
[i
].mp
,
613 marray
[i
].cont_count
* sizeof(**magicp
));
614 mentrycount
+= marray
[i
].cont_count
;
617 for (i
= 0; i
< marraycount
; i
++)
625 *nmagicp
= mentrycount
;
632 * extend the sign bit if the comparison is to be signed
635 file_signextend(struct magic_set
*ms
, struct magic
*m
, uint64_t v
)
637 if (!(m
->flag
& UNSIGNED
)) {
640 * Do not remove the casts below. They are
641 * vital. When later compared with the data,
642 * the sign extension must have happened.
685 case FILE_BESTRING16
:
686 case FILE_LESTRING16
:
692 if (ms
->flags
& MAGIC_CHECK
)
693 file_magwarn(ms
, "cannot happen: m->type=%d\n",
702 string_modifier_check(struct magic_set
*ms
, struct magic
const *m
)
704 if ((ms
->flags
& MAGIC_CHECK
) == 0)
708 case FILE_BESTRING16
:
709 case FILE_LESTRING16
:
710 if (m
->str_flags
!= 0) {
711 file_magwarn(ms
, "no modifiers allowed for 16-bit strings\n");
717 if ((m
->str_flags
& REGEX_OFFSET_START
) != 0) {
718 file_magwarn(ms
, "'/%c' only allowed on regex and search\n",
719 CHAR_REGEX_OFFSET_START
);
726 if ((m
->str_flags
& STRING_COMPACT_BLANK
) != 0) {
727 file_magwarn(ms
, "'/%c' not allowed on regex\n",
731 if ((m
->str_flags
& STRING_COMPACT_OPTIONAL_BLANK
) != 0) {
732 file_magwarn(ms
, "'/%c' not allowed on regex\n",
733 CHAR_COMPACT_OPTIONAL_BLANK
);
738 file_magwarn(ms
, "coding error: m->type=%d\n",
760 return FILE_OPMULTIPLY
;
762 return FILE_OPDIVIDE
;
764 return FILE_OPMODULO
;
770 #ifdef ENABLE_CONDITIONALS
772 get_cond(const char *l
, const char **t
)
774 static struct cond_tbl_s
{
779 { "if", 2, COND_IF
},
780 { "elif", 4, COND_ELIF
},
781 { "else", 4, COND_ELSE
},
782 { NULL
, 0, COND_NONE
},
784 struct cond_tbl_s
*p
;
786 for (p
= cond_tbl
; p
->name
; p
++) {
787 if (strncmp(l
, p
->name
, p
->len
) == 0 &&
788 isspace((unsigned char)l
[p
->len
])) {
798 check_cond(struct magic_set
*ms
, int cond
, uint32_t cont_level
)
801 last_cond
= ms
->c
.li
[cont_level
].last_cond
;
805 if (last_cond
!= COND_NONE
&& last_cond
!= COND_ELIF
) {
806 if (ms
->flags
& MAGIC_CHECK
)
807 file_magwarn(ms
, "syntax error: `if'");
814 if (last_cond
!= COND_IF
&& last_cond
!= COND_ELIF
) {
815 if (ms
->flags
& MAGIC_CHECK
)
816 file_magwarn(ms
, "syntax error: `elif'");
819 last_cond
= COND_ELIF
;
823 if (last_cond
!= COND_IF
&& last_cond
!= COND_ELIF
) {
824 if (ms
->flags
& MAGIC_CHECK
)
825 file_magwarn(ms
, "syntax error: `else'");
828 last_cond
= COND_NONE
;
832 last_cond
= COND_NONE
;
836 ms
->c
.li
[cont_level
].last_cond
= last_cond
;
839 #endif /* ENABLE_CONDITIONALS */
842 * parse one line from magic file, put into magic[index++] if valid
845 parse(struct magic_set
*ms
, struct magic_entry
**mentryp
, uint32_t *nmentryp
,
846 const char *line
, size_t lineno
, int action
)
848 #ifdef ENABLE_CONDITIONALS
849 static uint32_t last_cont_level
= 0;
852 struct magic_entry
*me
;
854 const char *l
= line
;
865 #ifdef ENABLE_CONDITIONALS
866 if (cont_level
== 0 || cont_level
> last_cont_level
)
867 if (file_check_mem(ms
, cont_level
) == -1)
869 last_cont_level
= cont_level
;
872 #define ALLOC_CHUNK (size_t)10
873 #define ALLOC_INCR (size_t)200
875 if (cont_level
!= 0) {
876 if (*nmentryp
== 0) {
877 file_error(ms
, 0, "No current entry for continuation");
880 me
= &(*mentryp
)[*nmentryp
- 1];
881 if (me
->cont_count
== me
->max_count
) {
883 size_t cnt
= me
->max_count
+ ALLOC_CHUNK
;
884 if ((nm
= realloc(me
->mp
, sizeof(*nm
) * cnt
)) == NULL
) {
885 file_oomem(ms
, sizeof(*nm
) * cnt
);
891 m
= &me
->mp
[me
->cont_count
++];
892 (void)memset(m
, 0, sizeof(*m
));
893 m
->cont_level
= cont_level
;
895 if (*nmentryp
== maxmagic
) {
896 struct magic_entry
*mp
;
898 maxmagic
+= ALLOC_INCR
;
899 if ((mp
= realloc(*mentryp
, sizeof(*mp
) * maxmagic
)) ==
901 file_oomem(ms
, sizeof(*mp
) * maxmagic
);
904 (void)memset(&mp
[*nmentryp
], 0, sizeof(*mp
) *
908 me
= &(*mentryp
)[*nmentryp
];
909 if (me
->mp
== NULL
) {
910 if ((m
= malloc(sizeof(*m
) * ALLOC_CHUNK
)) == NULL
) {
911 file_oomem(ms
, sizeof(*m
) * ALLOC_CHUNK
);
915 me
->max_count
= ALLOC_CHUNK
;
918 (void)memset(m
, 0, sizeof(*m
));
924 if (*l
== '&') { /* m->cont_level == 0 checked below. */
931 if (m
->flag
& OFFADD
)
932 m
->flag
= (m
->flag
& ~OFFADD
) | INDIROFFADD
;
934 if (*l
== '&') { /* m->cont_level == 0 checked below */
939 /* Indirect offsets are not valid at level 0. */
940 if (m
->cont_level
== 0 && (m
->flag
& (OFFADD
| INDIROFFADD
)))
941 if (ms
->flags
& MAGIC_CHECK
)
942 file_magwarn(ms
, "relative offset at level 0");
944 /* get offset, then skip over it */
945 m
->offset
= (uint32_t)strtoul(l
, &t
, 0);
947 if (ms
->flags
& MAGIC_CHECK
)
948 file_magwarn(ms
, "offset `%s' invalid", l
);
951 if (m
->flag
& INDIR
) {
952 m
->in_type
= FILE_LONG
;
955 * read [.lbs][+-]nnnnn)
961 m
->in_type
= FILE_LELONG
;
964 m
->in_type
= FILE_BELONG
;
967 m
->in_type
= FILE_MELONG
;
971 m
->in_type
= FILE_LESHORT
;
975 m
->in_type
= FILE_BESHORT
;
981 m
->in_type
= FILE_BYTE
;
986 m
->in_type
= FILE_LEDOUBLE
;
991 m
->in_type
= FILE_BEDOUBLE
;
994 if (ms
->flags
& MAGIC_CHECK
)
996 "indirect offset type `%c' invalid",
1005 m
->in_op
|= FILE_OPINVERSE
;
1008 if ((op
= get_op(*l
)) != -1) {
1013 m
->in_op
|= FILE_OPINDIRECT
;
1016 if (isdigit((unsigned char)*l
) || *l
== '-') {
1017 m
->in_offset
= (int32_t)strtol(l
, &t
, 0);
1019 if (ms
->flags
& MAGIC_CHECK
)
1021 "in_offset `%s' invalid", l
);
1025 ((m
->in_op
& FILE_OPINDIRECT
) && *l
++ != ')'))
1026 if (ms
->flags
& MAGIC_CHECK
)
1028 "missing ')' in indirect offset");
1032 #ifdef ENABLE_CONDITIONALS
1033 m
->cond
= get_cond(l
, &l
);
1034 if (check_cond(ms
, m
->cond
, cont_level
) == -1)
1042 m
->flag
|= UNSIGNED
;
1045 m
->type
= get_type(l
, &l
);
1046 if (m
->type
== FILE_INVALID
) {
1047 if (ms
->flags
& MAGIC_CHECK
)
1048 file_magwarn(ms
, "type `%s' invalid", l
);
1052 /* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
1053 /* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */
1057 if (!IS_STRING(m
->type
))
1058 m
->mask_op
|= FILE_OPINVERSE
;
1059 else if (ms
->flags
& MAGIC_CHECK
)
1060 file_magwarn(ms
, "'~' invalid for string types");
1066 if ((op
= get_op(*l
)) != -1) {
1067 if (!IS_STRING(m
->type
)) {
1071 val
= (uint64_t)strtoull(l
, &t
, 0);
1073 m
->num_mask
= file_signextend(ms
, m
, val
);
1076 else if (op
== FILE_OPDIVIDE
) {
1078 while (!isspace((unsigned char)*++l
)) {
1080 /* for portability avoid "case '0' ... '9':" */
1081 case '0': case '1': case '2':
1082 case '3': case '4': case '5':
1083 case '6': case '7': case '8':
1085 if (have_count
&& ms
->flags
& MAGIC_CHECK
)
1089 m
->str_count
= strtoul(l
, &t
, 0);
1093 case CHAR_COMPACT_BLANK
:
1094 m
->str_flags
|= STRING_COMPACT_BLANK
;
1096 case CHAR_COMPACT_OPTIONAL_BLANK
:
1098 STRING_COMPACT_OPTIONAL_BLANK
;
1100 case CHAR_IGNORE_LOWERCASE
:
1101 m
->str_flags
|= STRING_IGNORE_LOWERCASE
;
1103 case CHAR_IGNORE_UPPERCASE
:
1104 m
->str_flags
|= STRING_IGNORE_UPPERCASE
;
1106 case CHAR_REGEX_OFFSET_START
:
1107 m
->str_flags
|= REGEX_OFFSET_START
;
1110 if (ms
->flags
& MAGIC_CHECK
)
1112 "string extension `%c' invalid",
1116 /* allow multiple '/' for readability */
1117 if (l
[1] == '/' && !isspace((unsigned char)l
[2]))
1120 if (string_modifier_check(ms
, m
) == -1)
1124 if (ms
->flags
& MAGIC_CHECK
)
1125 file_magwarn(ms
, "invalid string op: %c", *t
);
1130 * We used to set mask to all 1's here, instead let's just not do
1131 * anything if mask = 0 (unless you have a better idea)
1138 /* Old-style anding: "0 byte &0x80 dynamically linked" */
1145 /* HP compat: ignore &= etc. */
1154 m
->reln
= '='; /* the default relation */
1155 if (*l
== 'x' && ((isascii((unsigned char)l
[1]) &&
1156 isspace((unsigned char)l
[1])) || !l
[1])) {
1163 * Grab the value part, except for an 'x' reln.
1165 if (m
->reln
!= 'x' && getvalue(ms
, m
, &l
, action
))
1169 * TODO finish this macro and start using it!
1170 * #define offsetcheck {if (offset > HOWMANY-1)
1171 * magwarn("offset too big"); }
1175 * Now get last part - the description
1181 } else if ((l
[0] == '\\') && (l
[1] == 'b')) {
1187 for (i
= 0; (m
->desc
[i
++] = *l
++) != '\0' && i
< sizeof(m
->desc
); )
1189 if (i
== sizeof(m
->desc
)) {
1190 m
->desc
[sizeof(m
->desc
) - 1] = '\0';
1191 if (ms
->flags
& MAGIC_CHECK
)
1192 file_magwarn(ms
, "description `%s' truncated", m
->desc
);
1196 * We only do this check while compiling, or if any of the magic
1197 * files were not compiled.
1199 if (ms
->flags
& MAGIC_CHECK
) {
1200 if (check_format(ms
, m
) == -1)
1203 #ifndef COMPILE_ONLY
1204 if (action
== FILE_CHECK
) {
1208 if (m
->cont_level
== 0)
1209 ++(*nmentryp
); /* make room for next */
1214 check_format_type(const char *ptr
, int type
)
1218 /* Missing format string; bad */
1231 while (isdigit((unsigned char)*ptr
)) ptr
++;
1234 while (isdigit((unsigned char)*ptr
)) ptr
++;
1286 case FILE_FMT_FLOAT
:
1287 case FILE_FMT_DOUBLE
:
1292 while (isdigit((unsigned char)*ptr
)) ptr
++;
1295 while (isdigit((unsigned char)*ptr
)) ptr
++;
1314 while (isdigit((unsigned char )*ptr
))
1318 while (isdigit((unsigned char )*ptr
))
1330 /* internal error */
1338 * Check that the optional printf format in description matches
1339 * the type of the magic.
1342 check_format(struct magic_set
*ms
, struct magic
*m
)
1346 for (ptr
= m
->desc
; *ptr
; ptr
++)
1350 /* No format string; ok */
1354 assert(file_nformats
== file_nnames
);
1356 if (m
->type
>= file_nformats
) {
1357 file_error(ms
, 0, "Internal error inconsistency between "
1358 "m->type and format strings");
1361 if (file_formats
[m
->type
] == FILE_FMT_NONE
) {
1362 file_error(ms
, 0, "No format string for `%s' with description "
1363 "`%s'", m
->desc
, file_names
[m
->type
]);
1368 if (check_format_type(ptr
, file_formats
[m
->type
]) == -1) {
1370 * TODO: this error message is unhelpful if the format
1371 * string is not one character long
1373 file_error(ms
, 0, "Printf format `%c' is not valid for type "
1374 " `%s' in description `%s'", *ptr
,
1375 file_names
[m
->type
], m
->desc
);
1379 for (; *ptr
; ptr
++) {
1382 "Too many format strings (should have at most one) "
1383 "for `%s' with description `%s'",
1384 file_names
[m
->type
], m
->desc
);
1392 * Read a numeric value from a pointer, into the value union of a magic
1393 * pointer, according to the magic type. Update the string pointer to point
1394 * just after the number read. Return 0 for success, non-zero for failure.
1397 getvalue(struct magic_set
*ms
, struct magic
*m
, const char **p
, int action
)
1402 case FILE_BESTRING16
:
1403 case FILE_LESTRING16
:
1408 *p
= getstr(ms
, *p
, m
->value
.s
, sizeof(m
->value
.s
), &slen
, action
);
1410 if (ms
->flags
& MAGIC_CHECK
)
1411 file_magwarn(ms
, "cannot get string from `%s'",
1420 if (m
->reln
!= 'x') {
1423 m
->value
.f
= strtof(*p
, &ep
);
1425 m
->value
.f
= (float)strtod(*p
, &ep
);
1433 if (m
->reln
!= 'x') {
1435 m
->value
.d
= strtod(*p
, &ep
);
1440 if (m
->reln
!= 'x') {
1442 m
->value
.q
= file_signextend(ms
, m
,
1443 (uint64_t)strtoull(*p
, &ep
, 0));
1452 * Convert a string containing C character escapes. Stop at an unescaped
1454 * Copy the converted version to "p", returning its length in *slen.
1455 * Return updated scan pointer as function result.
1457 private const char *
1458 getstr(struct magic_set
*ms
, const char *s
, char *p
, int plen
, int *slen
, int action
)
1460 const char *origs
= s
;
1462 char *pmax
= p
+ plen
- 1;
1466 while ((c
= *s
++) != '\0') {
1467 if (isspace((unsigned char) c
))
1470 file_error(ms
, 0, "string too long: `%s'", origs
);
1477 if (action
== FILE_COMPILE
)
1478 file_magwarn(ms
, "incomplete escape");
1482 if (action
== FILE_COMPILE
) {
1484 "escaped tab found, use \\t instead");
1489 if (action
== FILE_COMPILE
) {
1490 if (isprint((unsigned char)c
))
1492 "no need to escape `%c'", c
);
1495 "unknown escape sequence: \\%03o", c
);
1498 /* space, perhaps force people to use \040? */
1502 * Other things people escape, but shouldn't need to,
1503 * so we disallow them
1516 /* and baskslash itself */
1549 /* \ and up to 3 octal digits */
1559 c
= *s
++; /* try for 2 */
1560 if (c
>= '0' && c
<= '7') {
1561 val
= (val
<< 3) | (c
- '0');
1562 c
= *s
++; /* try for 3 */
1563 if (c
>= '0' && c
<= '7')
1564 val
= (val
<< 3) | (c
-'0');
1573 /* \x and up to 2 hex digits */
1575 val
= 'x'; /* Default if no digits */
1576 c
= hextoint(*s
++); /* Get next char */
1581 val
= (val
<< 4) + c
;
1599 /* Single hex char to int; -1 if not a hex char. */
1603 if (!isascii((unsigned char) c
))
1605 if (isdigit((unsigned char) c
))
1607 if ((c
>= 'a') && (c
<= 'f'))
1608 return c
+ 10 - 'a';
1609 if (( c
>= 'A') && (c
<= 'F'))
1610 return c
+ 10 - 'A';
1616 * Print a string containing C character escapes.
1619 file_showstr(FILE *fp
, const char *s
, size_t len
)
1633 if (c
>= 040 && c
<= 0176) /* TODO isprint && !iscntrl */
1634 (void) fputc(c
, fp
);
1636 (void) fputc('\\', fp
);
1639 (void) fputc('a', fp
);
1643 (void) fputc('b', fp
);
1647 (void) fputc('f', fp
);
1651 (void) fputc('n', fp
);
1655 (void) fputc('r', fp
);
1659 (void) fputc('t', fp
);
1663 (void) fputc('v', fp
);
1667 (void) fprintf(fp
, "%.3o", c
& 0377);
1675 * eatsize(): Eat the size spec from a number [eg. 10UL]
1678 eatsize(const char **p
)
1682 if (LOWCASE(*l
) == 'u')
1685 switch (LOWCASE(*l
)) {
1686 case 'l': /* long */
1687 case 's': /* short */
1688 case 'h': /* short */
1689 case 'b': /* char/byte */
1690 case 'c': /* char/byte */
1701 * handle a compiled file.
1704 apprentice_map(struct magic_set
*ms
, struct magic
**magicp
, uint32_t *nmagicp
,
1712 char buf
[MAXPATHLEN
];
1713 char *dbname
= mkdbname(fn
, buf
, sizeof(buf
), 0);
1719 if ((fd
= open(dbname
, O_RDONLY
|O_BINARY
)) == -1)
1722 if (fstat(fd
, &st
) == -1) {
1723 file_error(ms
, errno
, "cannot stat `%s'", dbname
);
1726 if (st
.st_size
< 16) {
1727 file_error(ms
, 0, "file `%s' is too small", dbname
);
1732 if ((mm
= mmap(0, (size_t)st
.st_size
, PROT_READ
|PROT_WRITE
,
1733 MAP_PRIVATE
|MAP_FILE
, fd
, (off_t
)0)) == MAP_FAILED
) {
1734 file_error(ms
, errno
, "cannot map `%s'", dbname
);
1739 if ((mm
= malloc((size_t)st
.st_size
)) == NULL
) {
1740 file_oomem(ms
, (size_t)st
.st_size
);
1743 if (read(fd
, mm
, (size_t)st
.st_size
) != (size_t)st
.st_size
) {
1752 ptr
= (uint32_t *)(void *)*magicp
;
1753 if (*ptr
!= MAGICNO
) {
1754 if (swap4(*ptr
) != MAGICNO
) {
1755 file_error(ms
, 0, "bad magic in `%s'");
1762 version
= swap4(ptr
[1]);
1765 if (version
!= VERSIONNO
) {
1766 file_error(ms
, 0, "File %d.%d supports only %d version magic "
1767 "files. `%s' is version %d", FILE_VERSION_MAJOR
, patchlevel
,
1768 VERSIONNO
, dbname
, version
);
1771 *nmagicp
= (uint32_t)(st
.st_size
/ sizeof(struct magic
)) - 1;
1774 byteswap(*magicp
, *nmagicp
);
1782 (void)munmap((void *)mm
, (size_t)st
.st_size
);
1793 private const uint32_t ar
[] = {
1797 * handle an mmaped file.
1800 apprentice_compile(struct magic_set
*ms
, struct magic
**magicp
,
1801 uint32_t *nmagicp
, const char *fn
)
1804 char buf
[MAXPATHLEN
];
1805 char *dbname
= mkdbname(fn
, buf
, sizeof(buf
), 1);
1810 if ((fd
= open(dbname
, O_WRONLY
|O_CREAT
|O_TRUNC
|O_BINARY
, 0644)) == -1) {
1811 file_error(ms
, errno
, "cannot open `%s'", dbname
);
1815 if (write(fd
, ar
, sizeof(ar
)) != (ssize_t
)sizeof(ar
)) {
1816 file_error(ms
, errno
, "error writing `%s'", dbname
);
1820 if (lseek(fd
, (off_t
)sizeof(struct magic
), SEEK_SET
)
1821 != sizeof(struct magic
)) {
1822 file_error(ms
, errno
, "error seeking `%s'", dbname
);
1826 if (write(fd
, *magicp
, (sizeof(struct magic
) * *nmagicp
))
1827 != (ssize_t
)(sizeof(struct magic
) * *nmagicp
)) {
1828 file_error(ms
, errno
, "error writing `%s'", dbname
);
1836 private const char ext
[] = ".mgc";
1841 mkdbname(const char *fn
, char *buf
, size_t bufsiz
, int strip
)
1845 if ((p
= strrchr(fn
, '/')) != NULL
)
1849 (void)snprintf(buf
, bufsiz
, "%s%s", fn
, ext
);
1854 * Byteswap an mmap'ed file if needed
1857 byteswap(struct magic
*magic
, uint32_t nmagic
)
1860 for (i
= 0; i
< nmagic
; i
++)
1871 uint8_t *s
= (uint8_t *)(void *)&sv
;
1872 uint8_t *d
= (uint8_t *)(void *)&rv
;
1885 uint8_t *s
= (uint8_t *)(void *)&sv
;
1886 uint8_t *d
= (uint8_t *)(void *)&rv
;
1901 uint8_t *s
= (uint8_t *)(void *)&sv
;
1902 uint8_t *d
= (uint8_t *)(void *)&rv
;
1915 * byteswap a single magic entry
1918 bs1(struct magic
*m
)
1920 m
->cont_level
= swap2(m
->cont_level
);
1921 m
->offset
= swap4((uint32_t)m
->offset
);
1922 m
->in_offset
= swap4((uint32_t)m
->in_offset
);
1923 m
->lineno
= swap4((uint32_t)m
->lineno
);
1924 if (IS_STRING(m
->type
)) {
1925 m
->str_count
= swap4(m
->str_count
);
1926 m
->str_flags
= swap4(m
->str_flags
);
1929 m
->value
.q
= swap8(m
->value
.q
);
1930 m
->num_mask
= swap8(m
->num_mask
);