1 /*
2 * Copyright (c) Christos Zoulas 2003.
3 * All Rights Reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
14 *
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
25 * SUCH DAMAGE.
26 */
27 #include "file.h"
28
29 #ifndef lint
30 FILE_RCSID("@(#)$File: funcs.c,v 1.61 2012/10/30 23:11:51 christos Exp $")
31 #endif /* lint */
32
33 #include "magic.h"
34 #include <stdarg.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <ctype.h>
38 #if defined(HAVE_WCHAR_H)
39 #include <wchar.h>
40 #endif
41 #if defined(HAVE_WCTYPE_H)
42 #include <wctype.h>
43 #endif
44
45 #ifndef SIZE_MAX
46 # define SIZE_MAX ((size_t) -1)
47 #endif
48
49 #ifndef PREG_OFFSET_CAPTURE
50 # define PREG_OFFSET_CAPTURE (1<<8)
51 #endif
52
53 extern public void convert_libmagic_pattern(zval *pattern, int options);
54
55 /*
56 * Like printf, only we append to a buffer.
57 */
58 protected int
file_printf(struct magic_set * ms,const char * fmt,...)59 file_printf(struct magic_set *ms, const char *fmt, ...)
60 {
61 va_list ap;
62 int len;
63 char *buf = NULL, *newstr;
64
65 va_start(ap, fmt);
66 len = vspprintf(&buf, 0, fmt, ap);
67 va_end(ap);
68
69 if (ms->o.buf != NULL) {
70 len = spprintf(&newstr, 0, "%s%s", ms->o.buf, (buf ? buf : ""));
71 if (buf) {
72 efree(buf);
73 }
74 efree(ms->o.buf);
75 ms->o.buf = newstr;
76 } else {
77 ms->o.buf = buf;
78 }
79 return 0;
80 }
81
82 /*
83 * error - print best error message possible
84 */
85 /*VARARGS*/
86 private void
file_error_core(struct magic_set * ms,int error,const char * f,va_list va,size_t lineno)87 file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
88 size_t lineno)
89 {
90 char *buf = NULL;
91
92 /* Only the first error is ok */
93 if (ms->event_flags & EVENT_HAD_ERR)
94 return;
95 if (lineno != 0) {
96 efree(ms->o.buf);
97 ms->o.buf = NULL;
98 file_printf(ms, "line %" SIZE_T_FORMAT "u: ", lineno);
99 }
100
101 vspprintf(&buf, 0, f, va);
102 va_end(va);
103
104 if (error > 0) {
105 file_printf(ms, "%s (%s)", (*buf ? buf : ""), strerror(error));
106 } else if (*buf) {
107 file_printf(ms, "%s", buf);
108 }
109
110 if (buf) {
111 efree(buf);
112 }
113
114 ms->event_flags |= EVENT_HAD_ERR;
115 ms->error = error;
116 }
117
118 /*VARARGS*/
119 protected void
file_error(struct magic_set * ms,int error,const char * f,...)120 file_error(struct magic_set *ms, int error, const char *f, ...)
121 {
122 va_list va;
123 va_start(va, f);
124 file_error_core(ms, error, f, va, 0);
125 va_end(va);
126 }
127
128 /*
129 * Print an error with magic line number.
130 */
131 /*VARARGS*/
132 protected void
file_magerror(struct magic_set * ms,const char * f,...)133 file_magerror(struct magic_set *ms, const char *f, ...)
134 {
135 va_list va;
136 va_start(va, f);
137 file_error_core(ms, 0, f, va, ms->line);
138 va_end(va);
139 }
140
141 protected void
file_oomem(struct magic_set * ms,size_t len)142 file_oomem(struct magic_set *ms, size_t len)
143 {
144 file_error(ms, errno, "cannot allocate %" SIZE_T_FORMAT "u bytes",
145 len);
146 }
147
148 protected void
file_badseek(struct magic_set * ms)149 file_badseek(struct magic_set *ms)
150 {
151 file_error(ms, errno, "error seeking");
152 }
153
154 protected void
file_badread(struct magic_set * ms)155 file_badread(struct magic_set *ms)
156 {
157 file_error(ms, errno, "error reading");
158 }
159
160 protected int
file_buffer(struct magic_set * ms,php_stream * stream,const char * inname,const void * buf,size_t nb)161 file_buffer(struct magic_set *ms, php_stream *stream, const char *inname, const void *buf,
162 size_t nb)
163 {
164 int m = 0, rv = 0, looks_text = 0;
165 int mime = ms->flags & MAGIC_MIME;
166 const unsigned char *ubuf = CAST(const unsigned char *, buf);
167 unichar *u8buf = NULL;
168 size_t ulen;
169 const char *code = NULL;
170 const char *code_mime = "binary";
171 const char *type = NULL;
172
173
174
175 if (nb == 0) {
176 if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
177 file_printf(ms, mime ? "application/x-empty" :
178 "empty") == -1)
179 return -1;
180 return 1;
181 } else if (nb == 1) {
182 if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
183 file_printf(ms, mime ? "application/octet-stream" :
184 "very short file (no magic)") == -1)
185 return -1;
186 return 1;
187 }
188
189 if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
190 looks_text = file_encoding(ms, ubuf, nb, &u8buf, &ulen,
191 &code, &code_mime, &type);
192 }
193
194 #ifdef __EMX__
195 if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
196 switch (file_os2_apptype(ms, inname, buf, nb)) {
197 case -1:
198 return -1;
199 case 0:
200 break;
201 default:
202 return 1;
203 }
204 }
205 #endif
206
207 #if PHP_FILEINFO_UNCOMPRESS
208 if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) == 0)
209 if ((m = file_zmagic(ms, stream, inname, ubuf, nb)) != 0) {
210 if ((ms->flags & MAGIC_DEBUG) != 0)
211 (void)fprintf(stderr, "zmagic %d\n", m);
212 goto done;
213 }
214 #endif
215 /* Check if we have a tar file */
216 if ((ms->flags & MAGIC_NO_CHECK_TAR) == 0)
217 if ((m = file_is_tar(ms, ubuf, nb)) != 0) {
218 if ((ms->flags & MAGIC_DEBUG) != 0)
219 (void)fprintf(stderr, "tar %d\n", m);
220 goto done;
221 }
222
223 /* Check if we have a CDF file */
224 if ((ms->flags & MAGIC_NO_CHECK_CDF) == 0) {
225 int fd;
226 TSRMLS_FETCH();
227 if (stream && SUCCESS == php_stream_cast(stream, PHP_STREAM_AS_FD, (void **)&fd, 0)) {
228 if ((m = file_trycdf(ms, fd, ubuf, nb)) != 0) {
229 if ((ms->flags & MAGIC_DEBUG) != 0)
230 (void)fprintf(stderr, "cdf %d\n", m);
231 goto done;
232 }
233 }
234 }
235
236 /* try soft magic tests */
237 if ((ms->flags & MAGIC_NO_CHECK_SOFT) == 0)
238 if ((m = file_softmagic(ms, ubuf, nb, 0, BINTEST,
239 looks_text)) != 0) {
240 if ((ms->flags & MAGIC_DEBUG) != 0)
241 (void)fprintf(stderr, "softmagic %d\n", m);
242 #ifdef BUILTIN_ELF
243 if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && m == 1 &&
244 nb > 5 && fd != -1) {
245 /*
246 * We matched something in the file, so this
247 * *might* be an ELF file, and the file is at
248 * least 5 bytes long, so if it's an ELF file
249 * it has at least one byte past the ELF magic
250 * number - try extracting information from the
251 * ELF headers that cannot easily * be
252 * extracted with rules in the magic file.
253 */
254 if ((m = file_tryelf(ms, fd, ubuf, nb)) != 0)
255 if ((ms->flags & MAGIC_DEBUG) != 0)
256 (void)fprintf(stderr,
257 "elf %d\n", m);
258 }
259 #endif
260 goto done;
261 }
262
263 /* try text properties */
264 if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {
265
266 if ((m = file_ascmagic(ms, ubuf, nb, looks_text)) != 0) {
267 if ((ms->flags & MAGIC_DEBUG) != 0)
268 (void)fprintf(stderr, "ascmagic %d\n", m);
269 goto done;
270 }
271
272 /* try to discover text encoding */
273 if ((ms->flags & MAGIC_NO_CHECK_ENCODING) == 0) {
274 if (looks_text == 0)
275 if ((m = file_ascmagic_with_encoding( ms, ubuf,
276 nb, u8buf, ulen, code, type, looks_text))
277 != 0) {
278 if ((ms->flags & MAGIC_DEBUG) != 0)
279 (void)fprintf(stderr,
280 "ascmagic/enc %d\n", m);
281 goto done;
282 }
283 }
284 }
285
286 /* give up */
287 m = 1;
288 if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
289 file_printf(ms, mime ? "application/octet-stream" : "data") == -1) {
290 rv = -1;
291 }
292 done:
293 if ((ms->flags & MAGIC_MIME_ENCODING) != 0) {
294 if (ms->flags & MAGIC_MIME_TYPE)
295 if (file_printf(ms, "; charset=") == -1)
296 rv = -1;
297 if (file_printf(ms, "%s", code_mime) == -1)
298 rv = -1;
299 }
300 free(u8buf);
301 if (rv)
302 return rv;
303
304 return m;
305 }
306
307 protected int
file_reset(struct magic_set * ms)308 file_reset(struct magic_set *ms)
309 {
310 if (ms->mlist[0] == NULL) {
311 file_error(ms, 0, "no magic files loaded");
312 return -1;
313 }
314 if (ms->o.buf) {
315 efree(ms->o.buf);
316 ms->o.buf = NULL;
317 }
318 if (ms->o.pbuf) {
319 efree(ms->o.pbuf);
320 ms->o.pbuf = NULL;
321 }
322 ms->event_flags &= ~EVENT_HAD_ERR;
323 ms->error = -1;
324 return 0;
325 }
326
327 #define OCTALIFY(n, o) \
328 /*LINTED*/ \
329 (void)(*(n)++ = '\\', \
330 *(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
331 *(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
332 *(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
333 (o)++)
334
335 protected const char *
file_getbuffer(struct magic_set * ms)336 file_getbuffer(struct magic_set *ms)
337 {
338 char *op, *np;
339 size_t psize, len;
340
341 if (ms->event_flags & EVENT_HAD_ERR)
342 return NULL;
343
344 if (ms->flags & MAGIC_RAW)
345 return ms->o.buf;
346
347 if (ms->o.buf == NULL)
348 return NULL;
349
350 /* * 4 is for octal representation, + 1 is for NUL */
351 len = strlen(ms->o.buf);
352 if (len > (SIZE_MAX - 1) / 4) {
353 return NULL;
354 }
355 psize = len * 4 + 1;
356 if ((ms->o.pbuf = CAST(char *, erealloc(ms->o.pbuf, psize))) == NULL) {
357 file_oomem(ms, psize);
358 return NULL;
359 }
360
361 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
362 {
363 mbstate_t state;
364 wchar_t nextchar;
365 int mb_conv = 1;
366 size_t bytesconsumed;
367 char *eop;
368 (void)memset(&state, 0, sizeof(mbstate_t));
369
370 np = ms->o.pbuf;
371 op = ms->o.buf;
372 eop = op + len;
373
374 while (op < eop) {
375 bytesconsumed = mbrtowc(&nextchar, op,
376 (size_t)(eop - op), &state);
377 if (bytesconsumed == (size_t)(-1) ||
378 bytesconsumed == (size_t)(-2)) {
379 mb_conv = 0;
380 break;
381 }
382
383 if (iswprint(nextchar)) {
384 (void)memcpy(np, op, bytesconsumed);
385 op += bytesconsumed;
386 np += bytesconsumed;
387 } else {
388 while (bytesconsumed-- > 0)
389 OCTALIFY(np, op);
390 }
391 }
392 *np = '\0';
393
394 /* Parsing succeeded as a multi-byte sequence */
395 if (mb_conv != 0)
396 return ms->o.pbuf;
397 }
398 #endif
399
400 for (np = ms->o.pbuf, op = ms->o.buf; *op;) {
401 if (isprint((unsigned char)*op)) {
402 *np++ = *op++;
403 } else {
404 OCTALIFY(np, op);
405 }
406 }
407 *np = '\0';
408 return ms->o.pbuf;
409 }
410
411 protected int
file_check_mem(struct magic_set * ms,unsigned int level)412 file_check_mem(struct magic_set *ms, unsigned int level)
413 {
414 size_t len;
415
416 if (level >= ms->c.len) {
417 len = (ms->c.len = 20 + level) * sizeof(*ms->c.li);
418 ms->c.li = CAST(struct level_info *, (ms->c.li == NULL) ?
419 emalloc(len) :
420 erealloc(ms->c.li, len));
421 if (ms->c.li == NULL) {
422 file_oomem(ms, len);
423 return -1;
424 }
425 }
426 ms->c.li[level].got_match = 0;
427 #ifdef ENABLE_CONDITIONALS
428 ms->c.li[level].last_match = 0;
429 ms->c.li[level].last_cond = COND_NONE;
430 #endif /* ENABLE_CONDITIONALS */
431 return 0;
432 }
433
434 protected size_t
file_printedlen(const struct magic_set * ms)435 file_printedlen(const struct magic_set *ms)
436 {
437 return ms->o.buf == NULL ? 0 : strlen(ms->o.buf);
438 }
439
440
441 protected int
file_replace(struct magic_set * ms,const char * pat,const char * rep)442 file_replace(struct magic_set *ms, const char *pat, const char *rep)
443 {
444 zval *patt;
445 int opts = 0;
446 pcre_cache_entry *pce;
447 char *res;
448 zval *repl;
449 int res_len, rep_cnt = 0;
450 TSRMLS_FETCH();
451
452 MAKE_STD_ZVAL(patt);
453 ZVAL_STRINGL(patt, pat, strlen(pat), 0);
454 opts |= PCRE_MULTILINE;
455 convert_libmagic_pattern(patt, opts);
456 if ((pce = pcre_get_compiled_regex_cache(Z_STRVAL_P(patt), Z_STRLEN_P(patt) TSRMLS_CC)) == NULL) {
457 zval_dtor(patt);
458 FREE_ZVAL(patt);
459 return -1;
460 }
461
462 MAKE_STD_ZVAL(repl);
463 ZVAL_STRINGL(repl, rep, strlen(rep), 0);
464
465 res = php_pcre_replace_impl(pce, ms->o.buf, strlen(ms->o.buf), repl,
466 0, &res_len, -1, &rep_cnt TSRMLS_CC);
467
468 FREE_ZVAL(repl);
469 zval_dtor(patt);
470 FREE_ZVAL(patt);
471
472 if (NULL == res) {
473 return -1;
474 }
475
476 strncpy(ms->o.buf, res, res_len);
477 ms->o.buf[res_len] = '\0';
478
479 efree(res);
480
481 return rep_cnt;
482 }
483
484
