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 * softmagic - interpret variable magic from MAGIC
35 FILE_RCSID("@(#)$File: softmagic.c,v 1.249 2017/06/19 18:30:25 christos Exp $")
46 private int match(struct magic_set *, struct magic *, uint32_t,
47 const unsigned char *, size_t, size_t, int, int, int, uint16_t *,
48 uint16_t *, int *, int *, int *);
49 private int mget(struct magic_set *, const unsigned char *,
50 struct magic *, size_t, size_t, unsigned int, int, int, int, uint16_t *,
51 uint16_t *, int *, int *, int *);
52 private int magiccheck(struct magic_set *, struct magic *);
53 private int32_t mprint(struct magic_set *, struct magic *);
54 private int moffset(struct magic_set *, struct magic *, size_t, int32_t *);
55 private void mdebug(uint32_t, const char *, size_t);
56 private int mcopy(struct magic_set *, union VALUETYPE *, int, int,
57 const unsigned char *, uint32_t, size_t, struct magic *);
58 private int mconvert(struct magic_set *, struct magic *, int);
59 private int print_sep(struct magic_set *, int);
60 private int handle_annotation(struct magic_set *, struct magic *, int);
61 private int cvt_8(union VALUETYPE *, const struct magic *);
62 private int cvt_16(union VALUETYPE *, const struct magic *);
63 private int cvt_32(union VALUETYPE *, const struct magic *);
64 private int cvt_64(union VALUETYPE *, const struct magic *);
66 #define OFFSET_OOB(n, o, i) ((n) < (uint32_t)(o) || (i) > ((n) - (o)))
67 #define BE64(p) (((uint64_t)(p)->hq[0]<<56)|((uint64_t)(p)->hq[1]<<48)| \
68 ((uint64_t)(p)->hq[2]<<40)|((uint64_t)(p)->hq[3]<<32)| \
69 ((uint64_t)(p)->hq[4]<<24)|((uint64_t)(p)->hq[5]<<16)| \
70 ((uint64_t)(p)->hq[6]<<8)|((uint64_t)(p)->hq[7]))
71 #define LE64(p) (((uint64_t)(p)->hq[7]<<56)|((uint64_t)(p)->hq[6]<<48)| \
72 ((uint64_t)(p)->hq[5]<<40)|((uint64_t)(p)->hq[4]<<32)| \
73 ((uint64_t)(p)->hq[3]<<24)|((uint64_t)(p)->hq[2]<<16)| \
74 ((uint64_t)(p)->hq[1]<<8)|((uint64_t)(p)->hq[0]))
75 #define LE32(p) (((uint32_t)(p)->hl[3]<<24)|((uint32_t)(p)->hl[2]<<16)| \
76 ((uint32_t)(p)->hl[1]<<8)|((uint32_t)(p)->hl[0]))
77 #define BE32(p) (((uint32_t)(p)->hl[0]<<24)|((uint32_t)(p)->hl[1]<<16)| \
78 ((uint32_t)(p)->hl[2]<<8)|((uint32_t)(p)->hl[3]))
79 #define ME32(p) (((uint32_t)(p)->hl[1]<<24)|((uint32_t)(p)->hl[0]<<16)| \
80 ((uint32_t)(p)->hl[3]<<8)|((uint32_t)(p)->hl[2]))
81 #define BE16(p) (((uint16_t)(p)->hs[0]<<8)|((uint16_t)(p)->hs[1]))
82 #define LE16(p) (((uint16_t)(p)->hs[1]<<8)|((uint16_t)(p)->hs[0]))
83 #define SEXT(s,v,p) ((s)?(intmax_t)(int##v##_t)(p):(intmax_t)(uint##v##_t)(p))
86 * softmagic - lookup one file in parsed, in-memory copy of database
87 * Passed the name and FILE * of one file to be typed.
89 /*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */
91 file_softmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes,
92 uint16_t *indir_count, uint16_t *name_count, int mode, int text)
95 int rv, printed_something = 0, need_separator = 0;
98 if (name_count == NULL) {
102 if (indir_count == NULL) {
107 for (ml = ms->mlist[0]->next; ml != ms->mlist[0]; ml = ml->next)
108 if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, 0, mode,
109 text, 0, indir_count, name_count,
110 &printed_something, &need_separator, NULL)) != 0)
116 #define FILE_FMTDEBUG
118 #define F(a, b, c) file_fmtcheck((a), (b), (c), __FILE__, __LINE__)
120 private const char * __attribute__((__format_arg__(3)))
121 file_fmtcheck(struct magic_set *ms, const struct magic *m, const char *def,
122 const char *file, size_t line)
124 const char *ptr = fmtcheck(m->desc, def);
127 "%s, %" SIZE_T_FORMAT "u: format `%s' does not match"
128 " with `%s'", file, line, m->desc, def);
132 #define F(a, b, c) fmtcheck((b)->desc, (c))
136 * Go through the whole list, stopping if you find a match. Process all
137 * the continuations of that match before returning.
139 * We support multi-level continuations:
141 * At any time when processing a successful top-level match, there is a
142 * current continuation level; it represents the level of the last
143 * successfully matched continuation.
145 * Continuations above that level are skipped as, if we see one, it
146 * means that the continuation that controls them - i.e, the
147 * lower-level continuation preceding them - failed to match.
149 * Continuations below that level are processed as, if we see one,
150 * it means we've finished processing or skipping higher-level
151 * continuations under the control of a successful or unsuccessful
152 * lower-level continuation, and are now seeing the next lower-level
153 * continuation and should process it. The current continuation
154 * level reverts to the level of the one we're seeing.
156 * Continuations at the current level are processed as, if we see
157 * one, there's no lower-level continuation that may have failed.
159 * If a continuation matches, we bump the current continuation level
160 * so that higher-level continuations are processed.
163 match(struct magic_set *ms, struct magic *magic, uint32_t nmagic,
164 const unsigned char *s, size_t nbytes, size_t offset, int mode, int text,
165 int flip, uint16_t *indir_count, uint16_t *name_count,
166 int *printed_something, int *need_separator, int *returnval)
168 uint32_t magindex = 0;
169 unsigned int cont_level = 0;
170 int returnvalv = 0, e; /* if a match is found it is set to 1*/
171 int firstline = 1; /* a flag to print X\n X\n- X */
172 int print = (ms->flags & MAGIC_NODESC) == 0;
174 if (returnval == NULL)
175 returnval = &returnvalv;
177 if (file_check_mem(ms, cont_level) == -1)
180 for (magindex = 0; magindex < nmagic; magindex++) {
182 struct magic *m = &magic[magindex];
184 if (m->type != FILE_NAME)
185 if ((IS_STRING(m->type) &&
186 #define FLT (STRING_BINTEST | STRING_TEXTTEST)
187 ((text && (m->str_flags & FLT) == STRING_BINTEST) ||
188 (!text && (m->str_flags & FLT) == STRING_TEXTTEST))) ||
189 (m->flag & mode) != mode) {
192 while (magindex < nmagic - 1 &&
193 magic[magindex + 1].cont_level != 0)
196 continue; /* Skip to next top-level test*/
199 ms->offset = m->offset;
200 ms->line = m->lineno;
202 /* if main entry matches, print it... */
203 switch (mget(ms, s, m, nbytes, offset, cont_level, mode, text,
204 flip, indir_count, name_count,
205 printed_something, need_separator, returnval)) {
209 flush = m->reln != '!';
212 if (m->type == FILE_INDIRECT)
215 switch (magiccheck(ms, m)) {
229 * main entry didn't match,
230 * flush its continuations
235 if ((e = handle_annotation(ms, m, firstline)) != 0) {
237 *printed_something = 1;
243 * If we are going to print something, we'll need to print
244 * a blank before we print something else.
248 *printed_something = 1;
249 if (print_sep(ms, firstline) == -1)
254 if (print && mprint(ms, m) == -1)
257 switch (moffset(ms, m, nbytes, &ms->c.li[cont_level].off)) {
265 /* and any continuations that match */
266 if (file_check_mem(ms, ++cont_level) == -1)
269 while (magindex + 1 < nmagic &&
270 magic[magindex + 1].cont_level != 0) {
271 m = &magic[++magindex];
272 ms->line = m->lineno; /* for messages */
274 if (cont_level < m->cont_level)
276 if (cont_level > m->cont_level) {
278 * We're at the end of the level
279 * "cont_level" continuations.
281 cont_level = m->cont_level;
283 ms->offset = m->offset;
284 if (m->flag & OFFADD) {
286 ms->c.li[cont_level - 1].off;
289 #ifdef ENABLE_CONDITIONALS
290 if (m->cond == COND_ELSE ||
291 m->cond == COND_ELIF) {
292 if (ms->c.li[cont_level].last_match == 1)
296 switch (mget(ms, s, m, nbytes, offset, cont_level, mode,
297 text, flip, indir_count, name_count,
298 printed_something, need_separator, returnval)) {
307 if (m->type == FILE_INDIRECT)
313 switch (flush ? 1 : magiccheck(ms, m)) {
317 #ifdef ENABLE_CONDITIONALS
318 ms->c.li[cont_level].last_match = 0;
322 #ifdef ENABLE_CONDITIONALS
323 ms->c.li[cont_level].last_match = 1;
325 if (m->type == FILE_CLEAR)
326 ms->c.li[cont_level].got_match = 0;
327 else if (ms->c.li[cont_level].got_match) {
328 if (m->type == FILE_DEFAULT)
331 ms->c.li[cont_level].got_match = 1;
333 if ((e = handle_annotation(ms, m, firstline)) != 0) {
335 *printed_something = 1;
340 * If we are going to print something,
341 * make sure that we have a separator first.
344 if (!*printed_something) {
345 *printed_something = 1;
346 if (print_sep(ms, firstline)
352 * This continuation matched. Print
353 * its message, with a blank before it
354 * if the previous item printed and
355 * this item isn't empty.
357 /* space if previous printed */
359 && ((m->flag & NOSPACE) == 0)
362 file_printf(ms, " ") == -1)
366 if (print && mprint(ms, m) == -1)
369 switch (moffset(ms, m, nbytes,
370 &ms->c.li[cont_level].off)) {
384 * If we see any continuations
388 if (file_check_mem(ms, ++cont_level) == -1)
393 if (*printed_something) {
398 if ((ms->flags & MAGIC_CONTINUE) == 0 && *printed_something) {
399 return *returnval; /* don't keep searching */
403 return *returnval; /* This is hit if -k is set or there is no match */
407 check_fmt(struct magic_set *ms, struct magic *m)
412 if (strchr(m->desc, '%') == NULL)
415 rc = file_regcomp(&rx, "%[-0-9\\.]*s", REG_EXTENDED|REG_NOSUB);
417 file_regerror(&rx, rc, ms);
419 rc = file_regexec(&rx, m->desc, 0, 0, 0);
427 char * strndup(const char *, size_t);
430 strndup(const char *str, size_t n)
435 for (len = 0; len < n && str[len]; len++)
437 if ((copy = malloc(len + 1)) == NULL)
439 (void)memcpy(copy, str, len);
443 #endif /* HAVE_STRNDUP */
446 mprint(struct magic_set *ms, struct magic *m)
452 char buf[128], tbuf[26], sbuf[512];
453 union VALUETYPE *p = &ms->ms_value;
457 v = file_signextend(ms, m, (uint64_t)p->b);
458 switch (check_fmt(ms, m)) {
462 (void)snprintf(buf, sizeof(buf), "%d",
464 if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
468 if (file_printf(ms, F(ms, m, "%d"),
469 (unsigned char) v) == -1)
473 t = ms->offset + sizeof(char);
479 v = file_signextend(ms, m, (uint64_t)p->h);
480 switch (check_fmt(ms, m)) {
484 (void)snprintf(buf, sizeof(buf), "%u",
486 if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
490 if (file_printf(ms, F(ms, m, "%u"),
491 (unsigned short) v) == -1)
495 t = ms->offset + sizeof(short);
502 v = file_signextend(ms, m, (uint64_t)p->l);
503 switch (check_fmt(ms, m)) {
507 (void)snprintf(buf, sizeof(buf), "%u", (uint32_t) v);
508 if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
512 if (file_printf(ms, F(ms, m, "%u"), (uint32_t) v) == -1)
516 t = ms->offset + sizeof(int32_t);
522 v = file_signextend(ms, m, p->q);
523 switch (check_fmt(ms, m)) {
527 (void)snprintf(buf, sizeof(buf), "%" INT64_T_FORMAT "u",
528 (unsigned long long)v);
529 if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
533 if (file_printf(ms, F(ms, m, "%" INT64_T_FORMAT "u"),
534 (unsigned long long) v) == -1)
538 t = ms->offset + sizeof(int64_t);
543 case FILE_BESTRING16:
544 case FILE_LESTRING16:
545 if (m->reln == '=' || m->reln == '!') {
546 if (file_printf(ms, F(ms, m, "%s"),
547 file_printable(sbuf, sizeof(sbuf), m->value.s))
550 t = ms->offset + m->vallen;
555 /* compute t before we mangle the string? */
556 t = ms->offset + strlen(str);
558 if (*m->value.s == '\0')
559 str[strcspn(str, "\r\n")] = '\0';
561 if (m->str_flags & STRING_TRIM) {
563 while (isspace((unsigned char)*str))
569 while (isspace((unsigned char)*last))
574 if (file_printf(ms, F(ms, m, "%s"),
575 file_printable(sbuf, sizeof(sbuf), str)) == -1)
578 if (m->type == FILE_PSTRING)
579 t += file_pstring_length_size(m);
587 if (file_printf(ms, F(ms, m, "%s"),
588 file_fmttime(p->l, 0, tbuf)) == -1)
590 t = ms->offset + sizeof(uint32_t);
597 if (file_printf(ms, F(ms, m, "%s"),
598 file_fmttime(p->l, FILE_T_LOCAL, tbuf)) == -1)
600 t = ms->offset + sizeof(uint32_t);
606 if (file_printf(ms, F(ms, m, "%s"),
607 file_fmttime(p->q, 0, tbuf)) == -1)
609 t = ms->offset + sizeof(uint64_t);
615 if (file_printf(ms, F(ms, m, "%s"),
616 file_fmttime(p->q, FILE_T_LOCAL, tbuf)) == -1)
618 t = ms->offset + sizeof(uint64_t);
624 if (file_printf(ms, F(ms, m, "%s"),
625 file_fmttime(p->q, FILE_T_WINDOWS, tbuf)) == -1)
627 t = ms->offset + sizeof(uint64_t);
634 switch (check_fmt(ms, m)) {
638 (void)snprintf(buf, sizeof(buf), "%g", vf);
639 if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
643 if (file_printf(ms, F(ms, m, "%g"), vf) == -1)
647 t = ms->offset + sizeof(float);
654 switch (check_fmt(ms, m)) {
658 (void)snprintf(buf, sizeof(buf), "%g", vd);
659 if (file_printf(ms, F(ms, m, "%s"), buf) == -1)
663 if (file_printf(ms, F(ms, m, "%g"), vd) == -1)
667 t = ms->offset + sizeof(double);
675 cp = strndup((const char *)ms->search.s, ms->search.rm_len);
677 file_oomem(ms, ms->search.rm_len);
680 rval = file_printf(ms, F(ms, m, "%s"),
681 file_printable(sbuf, sizeof(sbuf), cp));
687 if ((m->str_flags & REGEX_OFFSET_START))
688 t = ms->search.offset;
690 t = ms->search.offset + ms->search.rm_len;
696 if (file_printf(ms, "%s", m->desc) == -1)
707 if (file_printf(ms, F(ms, m, "%s"),
708 file_printable(sbuf, sizeof(sbuf), ms->ms_value.s)) == -1)
713 file_magerror(ms, "invalid m->type (%d) in mprint()", m->type);
720 moffset(struct magic_set *ms, struct magic *m, size_t nbytes, int32_t *op)
726 o = CAST(int32_t, (ms->offset + sizeof(char)));
732 o = CAST(int32_t, (ms->offset + sizeof(short)));
739 o = CAST(int32_t, (ms->offset + sizeof(int32_t)));
745 o = CAST(int32_t, (ms->offset + sizeof(int64_t)));
750 case FILE_BESTRING16:
751 case FILE_LESTRING16:
752 if (m->reln == '=' || m->reln == '!') {
753 o = ms->offset + m->vallen;
755 union VALUETYPE *p = &ms->ms_value;
757 if (*m->value.s == '\0')
758 p->s[strcspn(p->s, "\r\n")] = '\0';
759 o = CAST(uint32_t, (ms->offset + strlen(p->s)));
760 if (m->type == FILE_PSTRING)
761 o += (uint32_t)file_pstring_length_size(m);
769 o = CAST(int32_t, (ms->offset + sizeof(uint32_t)));
776 o = CAST(int32_t, (ms->offset + sizeof(uint32_t)));
782 o = CAST(int32_t, (ms->offset + sizeof(uint64_t)));
788 o = CAST(int32_t, (ms->offset + sizeof(uint64_t)));
794 o = CAST(int32_t, (ms->offset + sizeof(float)));
800 o = CAST(int32_t, (ms->offset + sizeof(double)));
804 if ((m->str_flags & REGEX_OFFSET_START) != 0)
805 o = CAST(int32_t, ms->search.offset);
808 (ms->search.offset + ms->search.rm_len));
812 if ((m->str_flags & REGEX_OFFSET_START) != 0)
813 o = CAST(int32_t, ms->search.offset);
815 o = CAST(int32_t, (ms->search.offset + m->vallen));
826 o = der_offs(ms, m, nbytes);
827 if (o == -1 || (size_t)o > nbytes) {
828 if ((ms->flags & MAGIC_DEBUG) != 0) {
829 (void)fprintf(stderr,
830 "Bad DER offset %d nbytes=%zu",
844 if ((size_t)o > nbytes) {
846 file_error(ms, 0, "Offset out of range %zu > %zu",
856 cvt_id3(struct magic_set *ms, uint32_t v)
858 v = ((((v >> 0) & 0x7f) << 0) |
859 (((v >> 8) & 0x7f) << 7) |
860 (((v >> 16) & 0x7f) << 14) |
861 (((v >> 24) & 0x7f) << 21));
862 if ((ms->flags & MAGIC_DEBUG) != 0)
863 fprintf(stderr, "id3 offs=%u\n", v);
868 cvt_flip(int type, int flip)
886 return FILE_LEQLDATE;
888 return FILE_LEQWDATE;
902 return FILE_BEQLDATE;
904 return FILE_BEQWDATE;
910 return FILE_LEDOUBLE;
912 return FILE_BEDOUBLE;
917 #define DO_CVT(fld, cast) \
919 switch (m->mask_op & FILE_OPS_MASK) { \
921 p->fld &= cast m->num_mask; \
924 p->fld |= cast m->num_mask; \
927 p->fld ^= cast m->num_mask; \
930 p->fld += cast m->num_mask; \
933 p->fld -= cast m->num_mask; \
935 case FILE_OPMULTIPLY: \
936 p->fld *= cast m->num_mask; \
938 case FILE_OPDIVIDE: \
939 if (cast m->num_mask == 0) \
941 p->fld /= cast m->num_mask; \
943 case FILE_OPMODULO: \
944 if (cast m->num_mask == 0) \
946 p->fld %= cast m->num_mask; \
949 if (m->mask_op & FILE_OPINVERSE) \
953 cvt_8(union VALUETYPE *p, const struct magic *m)
955 DO_CVT(b, (uint8_t));
960 cvt_16(union VALUETYPE *p, const struct magic *m)
962 DO_CVT(h, (uint16_t));
967 cvt_32(union VALUETYPE *p, const struct magic *m)
969 DO_CVT(l, (uint32_t));
974 cvt_64(union VALUETYPE *p, const struct magic *m)
976 DO_CVT(q, (uint64_t));
980 #define DO_CVT2(fld, cast) \
982 switch (m->mask_op & FILE_OPS_MASK) { \
984 p->fld += cast m->num_mask; \
987 p->fld -= cast m->num_mask; \
989 case FILE_OPMULTIPLY: \
990 p->fld *= cast m->num_mask; \
992 case FILE_OPDIVIDE: \
993 if (cast m->num_mask == 0) \
995 p->fld /= cast m->num_mask; \
1000 cvt_float(union VALUETYPE *p, const struct magic *m)
1002 DO_CVT2(f, (float));
1007 cvt_double(union VALUETYPE *p, const struct magic *m)
1009 DO_CVT2(d, (double));
1014 * Convert the byte order of the data we are looking at
1015 * While we're here, let's apply the mask operation
1016 * (unless you have a better idea)
1019 mconvert(struct magic_set *ms, struct magic *m, int flip)
1021 union VALUETYPE *p = &ms->ms_value;
1023 switch (cvt_flip(m->type, flip)) {
1025 if (cvt_8(p, m) == -1)
1029 if (cvt_16(p, m) == -1)
1035 if (cvt_32(p, m) == -1)
1042 if (cvt_64(p, m) == -1)
1046 case FILE_BESTRING16:
1047 case FILE_LESTRING16: {
1048 /* Null terminate and eat *trailing* return */
1049 p->s[sizeof(p->s) - 1] = '\0';
1052 case FILE_PSTRING: {
1053 size_t sz = file_pstring_length_size(m);
1054 char *ptr1 = p->s, *ptr2 = ptr1 + sz;
1055 size_t len = file_pstring_get_length(m, ptr1);
1056 sz = sizeof(p->s) - sz; /* maximum length of string */
1059 * The size of the pascal string length (sz)
1060 * is 1, 2, or 4. We need at least 1 byte for NUL
1061 * termination, but we've already truncated the
1062 * string by p->s, so we need to deduct sz.
1063 * Because we can use one of the bytes of the length
1064 * after we shifted as NUL termination.
1074 p->h = (short)BE16(p);
1075 if (cvt_16(p, m) == -1)
1081 p->l = (int32_t)BE32(p);
1082 if (cvt_32(p, m) == -1)
1089 p->q = (uint64_t)BE64(p);
1090 if (cvt_64(p, m) == -1)
1094 p->h = (short)LE16(p);
1095 if (cvt_16(p, m) == -1)
1101 p->l = (int32_t)LE32(p);
1102 if (cvt_32(p, m) == -1)
1109 p->q = (uint64_t)LE64(p);
1110 if (cvt_64(p, m) == -1)
1116 p->l = (int32_t)ME32(p);
1117 if (cvt_32(p, m) == -1)
1121 if (cvt_float(p, m) == -1)
1126 if (cvt_float(p, m) == -1)
1131 if (cvt_float(p, m) == -1)
1135 if (cvt_double(p, m) == -1)
1140 if (cvt_double(p, m) == -1)
1145 if (cvt_double(p, m) == -1)
1157 file_magerror(ms, "invalid type %d in mconvert()", m->type);
1161 file_magerror(ms, "zerodivide in mconvert()");
1167 mdebug(uint32_t offset, const char *str, size_t len)
1169 (void) fprintf(stderr, "mget/%" SIZE_T_FORMAT "u @%d: ", len, offset);
1170 file_showstr(stderr, str, len);
1171 (void) fputc('\n', stderr);
1172 (void) fputc('\n', stderr);
1176 mcopy(struct magic_set *ms, union VALUETYPE *p, int type, int indir,
1177 const unsigned char *s, uint32_t offset, size_t nbytes, struct magic *m)
1180 * Note: FILE_SEARCH and FILE_REGEX do not actually copy
1181 * anything, but setup pointers into the source
1187 if (offset > nbytes)
1188 offset = CAST(uint32_t, nbytes);
1189 ms->search.s = RCAST(const char *, s) + offset;
1190 ms->search.s_len = nbytes - offset;
1191 ms->search.offset = offset;
1197 const char *last; /* end of search region */
1198 const char *buf; /* start of search region */
1200 size_t lines, linecnt, bytecnt;
1202 if (s == NULL || nbytes < offset) {
1203 ms->search.s_len = 0;
1204 ms->search.s = NULL;
1208 if (m->str_flags & REGEX_LINE_COUNT) {
1209 linecnt = m->str_range;
1210 bytecnt = linecnt * 80;
1213 bytecnt = m->str_range;
1216 if (bytecnt == 0 || bytecnt > nbytes - offset)
1217 bytecnt = nbytes - offset;
1218 if (bytecnt > ms->regex_max)
1219 bytecnt = ms->regex_max;
1221 buf = RCAST(const char *, s) + offset;
1222 end = last = RCAST(const char *, s) + bytecnt + offset;
1223 /* mget() guarantees buf <= last */
1224 for (lines = linecnt, b = buf; lines && b < end &&
1225 ((b = CAST(const char *,
1226 memchr(c = b, '\n', CAST(size_t, (end - b)))))
1227 || (b = CAST(const char *,
1228 memchr(c, '\r', CAST(size_t, (end - c))))));
1231 if (b < end - 1 && b[0] == '\r' && b[1] == '\n')
1235 last = RCAST(const char *, s) + bytecnt;
1238 ms->search.s_len = last - buf;
1239 ms->search.offset = offset;
1240 ms->search.rm_len = 0;
1243 case FILE_BESTRING16:
1244 case FILE_LESTRING16: {
1245 const unsigned char *src = s + offset;
1246 const unsigned char *esrc = s + nbytes;
1248 char *edst = &p->s[sizeof(p->s) - 1];
1250 if (type == FILE_BESTRING16)
1253 /* check that offset is within range */
1254 if (offset >= nbytes)
1256 for (/*EMPTY*/; src < esrc; src += 2, dst++) {
1262 if (type == FILE_BESTRING16 ?
1263 *(src - 1) != '\0' :
1264 ((src + 1 < esrc) &&
1265 *(src + 1) != '\0'))
1272 case FILE_STRING: /* XXX - these two should not need */
1273 case FILE_PSTRING: /* to copy anything, but do anyway. */
1279 if (offset >= nbytes) {
1280 (void)memset(p, '\0', sizeof(*p));
1283 if (nbytes - offset < sizeof(*p))
1284 nbytes = nbytes - offset;
1286 nbytes = sizeof(*p);
1288 (void)memcpy(p, s + offset, nbytes);
1291 * the usefulness of padding with zeroes eludes me, it
1292 * might even cause problems
1294 if (nbytes < sizeof(*p))
1295 (void)memset(((char *)(void *)p) + nbytes, '\0',
1296 sizeof(*p) - nbytes);
1301 do_ops(struct magic *m, intmax_t lhs, intmax_t off)
1305 switch (m->in_op & FILE_OPS_MASK) {
1321 case FILE_OPMULTIPLY:
1333 if (m->in_op & FILE_OPINVERSE)
1336 return (uint32_t)offset;
1340 mget(struct magic_set *ms, const unsigned char *s, struct magic *m,
1341 size_t nbytes, size_t o, unsigned int cont_level, int mode, int text,
1342 int flip, uint16_t *indir_count, uint16_t *name_count,
1343 int *printed_something, int *need_separator, int *returnval)
1345 uint32_t offset = ms->offset;
1348 int rv, oneed_separator, in_type;
1350 union VALUETYPE *p = &ms->ms_value;
1353 if (*indir_count >= ms->indir_max) {
1354 file_error(ms, 0, "indirect count (%hu) exceeded",
1359 if (*name_count >= ms->name_max) {
1360 file_error(ms, 0, "name use count (%hu) exceeded",
1365 if (mcopy(ms, p, m->type, m->flag & INDIR, s, (uint32_t)(offset + o),
1366 (uint32_t)nbytes, m) == -1)
1369 if ((ms->flags & MAGIC_DEBUG) != 0) {
1370 fprintf(stderr, "mget(type=%d, flag=%#x, offset=%u, o=%"
1371 SIZE_T_FORMAT "u, " "nbytes=%" SIZE_T_FORMAT
1372 "u, il=%hu, nc=%hu)\n",
1373 m->type, m->flag, offset, o, nbytes,
1374 *indir_count, *name_count);
1375 mdebug(offset, (char *)(void *)p, sizeof(union VALUETYPE));
1376 #ifndef COMPILE_ONLY
1381 if (m->flag & INDIR) {
1382 intmax_t off = m->in_offset;
1383 const int sgn = m->in_op & FILE_OPSIGNED;
1384 if (m->in_op & FILE_OPINDIRECT) {
1385 const union VALUETYPE *q = CAST(const union VALUETYPE *,
1386 ((const void *)(s + offset + off)));
1387 if (OFFSET_OOB(nbytes, offset + off, sizeof(*q)))
1389 switch (cvt_flip(m->in_type, flip)) {
1391 off = SEXT(sgn,8,q->b);
1394 off = SEXT(sgn,16,q->h);
1397 off = SEXT(sgn,16,BE16(q));
1400 off = SEXT(sgn,16,LE16(q));
1403 off = SEXT(sgn,32,q->l);
1407 off = SEXT(sgn,32,BE32(q));
1411 off = SEXT(sgn,32,LE32(q));
1414 off = SEXT(sgn,32,ME32(q));
1417 if ((ms->flags & MAGIC_DEBUG) != 0)
1418 fprintf(stderr, "indirect offs=%jd\n", off);
1420 switch (in_type = cvt_flip(m->in_type, flip)) {
1422 if (OFFSET_OOB(nbytes, offset, 1))
1424 offset = do_ops(m, SEXT(sgn,8,p->b), off);
1427 if (OFFSET_OOB(nbytes, offset, 2))
1429 offset = do_ops(m, SEXT(sgn,16,BE16(p)), off);
1432 if (OFFSET_OOB(nbytes, offset, 2))
1434 offset = do_ops(m, SEXT(sgn,16,LE16(p)), off);
1437 if (OFFSET_OOB(nbytes, offset, 2))
1439 offset = do_ops(m, SEXT(sgn,16,p->h), off);
1443 if (OFFSET_OOB(nbytes, offset, 4))
1446 if (in_type == FILE_BEID3)
1447 lhs = cvt_id3(ms, (uint32_t)lhs);
1448 offset = do_ops(m, SEXT(sgn,32,lhs), off);
1452 if (OFFSET_OOB(nbytes, offset, 4))
1455 if (in_type == FILE_LEID3)
1456 lhs = cvt_id3(ms, (uint32_t)lhs);
1457 offset = do_ops(m, SEXT(sgn,32,lhs), off);
1460 if (OFFSET_OOB(nbytes, offset, 4))
1462 offset = do_ops(m, SEXT(sgn,32,ME32(p)), off);
1465 if (OFFSET_OOB(nbytes, offset, 4))
1467 offset = do_ops(m, SEXT(sgn,32,p->l), off);
1473 if (m->flag & INDIROFFADD) {
1474 offset += ms->c.li[cont_level-1].off;
1476 if ((ms->flags & MAGIC_DEBUG) != 0)
1478 "indirect *zero* offset\n");
1481 if ((ms->flags & MAGIC_DEBUG) != 0)
1482 fprintf(stderr, "indirect +offs=%u\n", offset);
1484 if (mcopy(ms, p, m->type, 0, s, offset, nbytes, m) == -1)
1486 ms->offset = offset;
1488 if ((ms->flags & MAGIC_DEBUG) != 0) {
1489 mdebug(offset, (char *)(void *)p,
1490 sizeof(union VALUETYPE));
1491 #ifndef COMPILE_ONLY
1497 /* Verify we have enough data to match magic type */
1500 if (OFFSET_OOB(nbytes, offset, 1))
1507 if (OFFSET_OOB(nbytes, offset, 2))
1526 if (OFFSET_OOB(nbytes, offset, 4))
1533 if (OFFSET_OOB(nbytes, offset, 8))
1540 if (OFFSET_OOB(nbytes, offset, m->vallen))
1545 if (nbytes < offset)
1550 if (m->str_flags & INDIRECT_RELATIVE)
1551 offset += CAST(uint32_t, o);
1555 if (nbytes < offset)
1558 if ((pb = file_push_buffer(ms)) == NULL)
1562 rv = file_softmagic(ms, s + offset, nbytes - offset,
1563 indir_count, name_count, BINTEST, text);
1565 if ((ms->flags & MAGIC_DEBUG) != 0)
1566 fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv);
1568 rbuf = file_pop_buffer(ms, pb);
1569 if (rbuf == NULL && ms->event_flags & EVENT_HAD_ERR)
1573 if ((ms->flags & MAGIC_NODESC) == 0 &&
1574 file_printf(ms, F(ms, m, "%u"), offset) == -1) {
1578 if (file_printf(ms, "%s", rbuf) == -1) {
1587 if (nbytes < offset)
1594 if (file_magicfind(ms, rbuf, &ml) == -1) {
1595 file_error(ms, 0, "cannot find entry `%s'", rbuf);
1599 oneed_separator = *need_separator;
1600 if (m->flag & NOSPACE)
1601 *need_separator = 0;
1602 rv = match(ms, ml.magic, ml.nmagic, s, nbytes, offset + o,
1603 mode, text, flip, indir_count, name_count,
1604 printed_something, need_separator, returnval);
1606 *need_separator = oneed_separator;
1610 if (ms->flags & MAGIC_NODESC)
1612 if (file_printf(ms, "%s", m->desc) == -1)
1616 case FILE_DEFAULT: /* nothing to check */
1621 if (!mconvert(ms, m, flip))
1627 file_strncmp(const char *s1, const char *s2, size_t len, uint32_t flags)
1630 * Convert the source args to unsigned here so that (1) the
1631 * compare will be unsigned as it is in strncmp() and (2) so
1632 * the ctype functions will work correctly without extra
1635 const unsigned char *a = (const unsigned char *)s1;
1636 const unsigned char *b = (const unsigned char *)s2;
1637 const unsigned char *eb = b + len;
1641 * What we want here is v = strncmp(s1, s2, len),
1642 * but ignoring any nulls.
1645 if (0L == flags) { /* normal string: do it fast */
1647 if ((v = *b++ - *a++) != '\0')
1650 else { /* combine the others */
1656 if ((flags & STRING_IGNORE_LOWERCASE) &&
1658 if ((v = tolower(*b++) - *a++) != '\0')
1661 else if ((flags & STRING_IGNORE_UPPERCASE) &&
1663 if ((v = toupper(*b++) - *a++) != '\0')
1666 else if ((flags & STRING_COMPACT_WHITESPACE) &&
1669 if (isspace(*b++)) {
1671 while (b < eb && isspace(*b))
1679 else if ((flags & STRING_COMPACT_OPTIONAL_WHITESPACE) &&
1682 while (b < eb && isspace(*b))
1686 if ((v = *b++ - *a++) != '\0')
1695 file_strncmp16(const char *a, const char *b, size_t len, uint32_t flags)
1698 * XXX - The 16-bit string compare probably needs to be done
1699 * differently, especially if the flags are to be supported.
1700 * At the moment, I am unsure.
1703 return file_strncmp(a, b, len, flags);
1707 magiccheck(struct magic_set *ms, struct magic *m)
1709 uint64_t l = m->value.q;
1714 union VALUETYPE *p = &ms->ms_value;
1784 file_magerror(ms, "cannot happen with float: invalid relation `%c'",
1817 file_magerror(ms, "cannot happen with double: invalid relation `%c'", m->reln);
1831 v = file_strncmp(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
1834 case FILE_BESTRING16:
1835 case FILE_LESTRING16:
1837 v = file_strncmp16(m->value.s, p->s, (size_t)m->vallen, m->str_flags);
1840 case FILE_SEARCH: { /* search ms->search.s for the string m->value.s */
1844 if (ms->search.s == NULL)
1847 slen = MIN(m->vallen, sizeof(m->value.s));
1851 for (idx = 0; m->str_range == 0 || idx < m->str_range; idx++) {
1852 if (slen + idx > ms->search.s_len)
1855 v = file_strncmp(m->value.s, ms->search.s + idx, slen,
1857 if (v == 0) { /* found match */
1858 ms->search.offset += idx;
1859 ms->search.rm_len = ms->search.s_len - idx;
1870 if (ms->search.s == NULL)
1874 rc = file_regcomp(&rx, m->value.s,
1875 REG_EXTENDED|REG_NEWLINE|
1876 ((m->str_flags & STRING_IGNORE_CASE) ? REG_ICASE : 0));
1878 file_regerror(&rx, rc, ms);
1882 size_t slen = ms->search.s_len;
1885 copy = CAST(char *, malloc(slen));
1888 file_error(ms, errno,
1889 "can't allocate %" SIZE_T_FORMAT "u bytes",
1893 memcpy(copy, ms->search.s, slen);
1894 copy[--slen] = '\0';
1897 search = CCAST(char *, "");
1900 rc = file_regexec(&rx, (const char *)search,
1905 ms->search.s += (int)pmatch.rm_so;
1906 ms->search.offset += (size_t)pmatch.rm_so;
1908 (size_t)(pmatch.rm_eo - pmatch.rm_so);
1917 file_regerror(&rx, rc, ms);
1923 if (v == (uint64_t)-1)
1932 matched = der_cmp(ms, m);
1933 if (matched == -1) {
1934 if ((ms->flags & MAGIC_DEBUG) != 0) {
1935 (void) fprintf(stderr,
1936 "EOF comparing DER entries");
1942 file_magerror(ms, "invalid type %d in magiccheck()", m->type);
1946 v = file_signextend(ms, m, v);
1950 if ((ms->flags & MAGIC_DEBUG) != 0)
1951 (void) fprintf(stderr, "%" INT64_T_FORMAT
1952 "u == *any* = 1\n", (unsigned long long)v);
1958 if ((ms->flags & MAGIC_DEBUG) != 0)
1959 (void) fprintf(stderr, "%" INT64_T_FORMAT "u != %"
1960 INT64_T_FORMAT "u = %d\n", (unsigned long long)v,
1961 (unsigned long long)l, matched);
1966 if ((ms->flags & MAGIC_DEBUG) != 0)
1967 (void) fprintf(stderr, "%" INT64_T_FORMAT "u == %"
1968 INT64_T_FORMAT "u = %d\n", (unsigned long long)v,
1969 (unsigned long long)l, matched);
1973 if (m->flag & UNSIGNED) {
1975 if ((ms->flags & MAGIC_DEBUG) != 0)
1976 (void) fprintf(stderr, "%" INT64_T_FORMAT
1977 "u > %" INT64_T_FORMAT "u = %d\n",
1978 (unsigned long long)v,
1979 (unsigned long long)l, matched);
1982 matched = (int64_t) v > (int64_t) l;
1983 if ((ms->flags & MAGIC_DEBUG) != 0)
1984 (void) fprintf(stderr, "%" INT64_T_FORMAT
1985 "d > %" INT64_T_FORMAT "d = %d\n",
1986 (long long)v, (long long)l, matched);
1991 if (m->flag & UNSIGNED) {
1993 if ((ms->flags & MAGIC_DEBUG) != 0)
1994 (void) fprintf(stderr, "%" INT64_T_FORMAT
1995 "u < %" INT64_T_FORMAT "u = %d\n",
1996 (unsigned long long)v,
1997 (unsigned long long)l, matched);
2000 matched = (int64_t) v < (int64_t) l;
2001 if ((ms->flags & MAGIC_DEBUG) != 0)
2002 (void) fprintf(stderr, "%" INT64_T_FORMAT
2003 "d < %" INT64_T_FORMAT "d = %d\n",
2004 (long long)v, (long long)l, matched);
2009 matched = (v & l) == l;
2010 if ((ms->flags & MAGIC_DEBUG) != 0)
2011 (void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %"
2012 INT64_T_FORMAT "x) == %" INT64_T_FORMAT
2013 "x) = %d\n", (unsigned long long)v,
2014 (unsigned long long)l, (unsigned long long)l,
2019 matched = (v & l) != l;
2020 if ((ms->flags & MAGIC_DEBUG) != 0)
2021 (void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %"
2022 INT64_T_FORMAT "x) != %" INT64_T_FORMAT
2023 "x) = %d\n", (unsigned long long)v,
2024 (unsigned long long)l, (unsigned long long)l,
2029 file_magerror(ms, "cannot happen: invalid relation `%c'",
2038 handle_annotation(struct magic_set *ms, struct magic *m, int firstline)
2040 if ((ms->flags & MAGIC_APPLE) && m->apple[0]) {
2041 if (!firstline && file_printf(ms, "\n- ") == -1)
2043 if (file_printf(ms, "%.8s", m->apple) == -1)
2047 if ((ms->flags & MAGIC_EXTENSION) && m->ext[0]) {
2048 if (!firstline && file_printf(ms, "\n- ") == -1)
2050 if (file_printf(ms, "%s", m->ext) == -1)
2054 if ((ms->flags & MAGIC_MIME_TYPE) && m->mimetype[0]) {
2055 if (!firstline && file_printf(ms, "\n- ") == -1)
2057 if (file_printf(ms, "%s", m->mimetype) == -1)
2065 print_sep(struct magic_set *ms, int firstline)
2067 // if (ms->flags & MAGIC_NODESC)
2072 * we found another match
2073 * put a newline and '-' to do some simple formatting
2075 return file_printf(ms, "\n- ");