2 * Copyright (c) Christos Zoulas 2003.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice immediately at the beginning of the file, without modification,
10 * this list of conditions, and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #if defined(HAVE_WCHAR_H)
36 #if defined(HAVE_WCTYPE_H)
39 #if defined(HAVE_LIMITS_H)
44 #define SIZE_T_MAX (size_t)0xffffffffffffffffU
46 #define SIZE_T_MAX (size_t)0xffffffffU
51 FILE_RCSID("@(#)$File: funcs.c,v 1.35 2007/12/27 16:35:59 christos Exp $")
54 #ifndef HAVE_VSNPRINTF
55 int vsnprintf(char *, size_t, const char *, va_list);
59 * Like printf, only we print to a buffer and advance it.
62 file_printf(struct magic_set
*ms
, const char *fmt
, ...)
71 len
= vsnprintf(ms
->o
.ptr
, ms
->o
.left
, fmt
, ap
);
74 if (len
>= (ssize_t
)ms
->o
.left
) {
75 long diff
; /* XXX: really ptrdiff_t */
78 size
= (ms
->o
.size
- ms
->o
.left
) + len
+ 1024;
79 if ((buf
= realloc(ms
->o
.buf
, size
)) == NULL
) {
83 diff
= ms
->o
.ptr
- ms
->o
.buf
;
84 ms
->o
.ptr
= buf
+ diff
;
86 ms
->o
.left
= size
- diff
;
90 len
= vsnprintf(ms
->o
.ptr
, ms
->o
.left
, fmt
, ap
);
99 file_error(ms
, errno
, "vsnprintf failed");
104 * error - print best error message possible
108 file_error_core(struct magic_set
*ms
, int error
, const char *f
, va_list va
,
112 /* Only the first error is ok */
117 (void)snprintf(ms
->o
.buf
, ms
->o
.size
, "line %u: ", lineno
);
118 len
= strlen(ms
->o
.buf
);
120 (void)vsnprintf(ms
->o
.buf
+ len
, ms
->o
.size
- len
, f
, va
);
122 len
= strlen(ms
->o
.buf
);
123 (void)snprintf(ms
->o
.buf
+ len
, ms
->o
.size
- len
, " (%s)",
132 file_error(struct magic_set
*ms
, int error
, const char *f
, ...)
136 file_error_core(ms
, error
, f
, va
, 0);
141 * Print an error with magic line number.
145 file_magerror(struct magic_set
*ms
, const char *f
, ...)
149 file_error_core(ms
, 0, f
, va
, ms
->line
);
154 file_oomem(struct magic_set
*ms
, size_t len
)
156 file_error(ms
, errno
, "cannot allocate %zu bytes", len
);
160 file_badseek(struct magic_set
*ms
)
162 file_error(ms
, errno
, "error seeking");
166 file_badread(struct magic_set
*ms
)
168 file_error(ms
, errno
, "error reading");
173 file_buffer(struct magic_set
*ms
, int fd
, const char *inname
, const void *buf
,
177 int mime
= ms
->flags
& MAGIC_MIME
;
180 if ((!mime
|| (mime
& MAGIC_MIME_TYPE
)) &&
181 file_printf(ms
, mime
? "application/x-empty" :
185 } else if (nb
== 1) {
186 if ((!mime
|| (mime
& MAGIC_MIME_TYPE
)) &&
187 file_printf(ms
, mime
? "application/octet-stream" :
188 "very short file (no magic)") == -1)
194 if ((ms
->flags
& MAGIC_NO_CHECK_APPTYPE
) == 0 && inname
) {
195 switch (file_os2_apptype(ms
, inname
, buf
, nb
)) {
206 /* try compression stuff */
207 if ((ms
->flags
& MAGIC_NO_CHECK_COMPRESS
) != 0 ||
208 (m
= file_zmagic(ms
, fd
, inname
, buf
, nb
)) == 0) {
209 /* Check if we have a tar file */
210 if ((ms
->flags
& MAGIC_NO_CHECK_TAR
) != 0 ||
211 (m
= file_is_tar(ms
, buf
, nb
)) == 0) {
212 /* try tests in /etc/magic (or surrogate magic file) */
213 if ((ms
->flags
& MAGIC_NO_CHECK_SOFT
) != 0 ||
214 (m
= file_softmagic(ms
, buf
, nb
)) == 0) {
215 /* try known keywords, check whether it is ASCII */
216 if ((ms
->flags
& MAGIC_NO_CHECK_ASCII
) != 0 ||
217 (m
= file_ascmagic(ms
, buf
, nb
)) == 0) {
218 /* abandon hope, all ye who remain here */
219 if ((!mime
|| (mime
& MAGIC_MIME_TYPE
)) &&
220 file_printf(ms
, mime
? "application/octet-stream" :
229 if ((ms
->flags
& MAGIC_NO_CHECK_ELF
) == 0 && m
== 1 &&
230 nb
> 5 && fd
!= -1) {
232 * We matched something in the file, so this *might*
233 * be an ELF file, and the file is at least 5 bytes
234 * long, so if it's an ELF file it has at least one
235 * byte past the ELF magic number - try extracting
236 * information from the ELF headers that cannot easily
237 * be extracted with rules in the magic file.
239 (void)file_tryelf(ms
, fd
, buf
, nb
);
247 file_reset(struct magic_set
*ms
)
249 if (ms
->mlist
== NULL
) {
250 file_error(ms
, 0, "no magic files loaded");
253 ms
->o
.ptr
= ms
->o
.buf
;
254 ms
->o
.left
= ms
->o
.size
;
260 #define OCTALIFY(n, o) \
262 (void)(*(n)++ = '\\', \
263 *(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
264 *(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
265 *(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
268 protected const char *
269 file_getbuffer(struct magic_set
*ms
)
271 char *pbuf
, *op
, *np
;
277 if (ms
->flags
& MAGIC_RAW
)
280 len
= ms
->o
.size
- ms
->o
.left
;
281 /* * 4 is for octal representation, + 1 is for NUL */
282 if (len
> (SIZE_T_MAX
- 1) / 4) {
287 if (ms
->o
.psize
< psize
) {
288 if ((pbuf
= realloc(ms
->o
.pbuf
, psize
)) == NULL
) {
289 file_oomem(ms
, psize
);
296 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
301 size_t bytesconsumed
;
303 (void)memset(&state
, 0, sizeof(mbstate_t));
307 eop
= op
+ strlen(ms
->o
.buf
);
310 bytesconsumed
= mbrtowc(&nextchar
, op
,
311 (size_t)(eop
- op
), &state
);
312 if (bytesconsumed
== (size_t)(-1) ||
313 bytesconsumed
== (size_t)(-2)) {
318 if (iswprint(nextchar
)) {
319 (void)memcpy(np
, op
, bytesconsumed
);
323 while (bytesconsumed
-- > 0)
329 /* Parsing succeeded as a multi-byte sequence */
335 for (np
= ms
->o
.pbuf
, op
= ms
->o
.buf
; *op
; op
++) {
336 if (isprint((unsigned char)*op
)) {
347 file_check_mem(struct magic_set
*ms
, unsigned int level
)
351 if (level
>= ms
->c
.len
) {
352 len
= (ms
->c
.len
+= 20) * sizeof(*ms
->c
.li
);
353 ms
->c
.li
= (ms
->c
.li
== NULL
) ? malloc(len
) :
354 realloc(ms
->c
.li
, len
);
355 if (ms
->c
.li
== NULL
) {
360 ms
->c
.li
[level
].got_match
= 0;
361 #ifdef ENABLE_CONDITIONALS
362 ms
->c
.li
[level
].last_match
= 0;
363 ms
->c
.li
[level
].last_cond
= COND_NONE
;
364 #endif /* ENABLE_CONDITIONALS */
368 * Yes these wrappers suffer from buffer overflows, but if your OS does not
369 * have the real functions, maybe you should consider replacing your OS?
371 #ifndef HAVE_VSNPRINTF
373 vsnprintf(char *buf
, size_t len
, const char *fmt
, va_list ap
)
375 return vsprintf(buf
, fmt
, ap
);
379 #ifndef HAVE_SNPRINTF
382 snprintf(char *buf
, size_t len
, const char *fmt
, ...)
387 rv
= vsprintf(buf
, fmt
, ap
);