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 1.60 2011/12/08 12:38:24 rrt 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 #if defined(__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, 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 == 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 *pbuf, *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 pbuf = erealloc(ms->o.pbuf, psize);
357 ms->o.pbuf = pbuf;
358
359 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
360 {
361 mbstate_t state;
362 wchar_t nextchar;
363 int mb_conv = 1;
364 size_t bytesconsumed;
365 char *eop;
366 (void)memset(&state, 0, sizeof(mbstate_t));
367
368 np = ms->o.pbuf;
369 op = ms->o.buf;
370 eop = op + len;
371
372 while (op < eop) {
373 bytesconsumed = mbrtowc(&nextchar, op,
374 (size_t)(eop - op), &state);
375 if (bytesconsumed == (size_t)(-1) ||
376 bytesconsumed == (size_t)(-2)) {
377 mb_conv = 0;
378 break;
379 }
380
381 if (iswprint(nextchar)) {
382 (void)memcpy(np, op, bytesconsumed);
383 op += bytesconsumed;
384 np += bytesconsumed;
385 } else {
386 while (bytesconsumed-- > 0)
387 OCTALIFY(np, op);
388 }
389 }
390 *np = '\0';
391
392 /* Parsing succeeded as a multi-byte sequence */
393 if (mb_conv != 0)
394 return ms->o.pbuf;
395 }
396 #endif
397
398 for (np = ms->o.pbuf, op = ms->o.buf; *op;) {
399 if (isprint((unsigned char)*op)) {
400 *np++ = *op++;
401 } else {
402 OCTALIFY(np, op);
403 }
404 }
405 *np = '\0';
406 return ms->o.pbuf;
407 }
408
409 protected int
file_check_mem(struct magic_set * ms,unsigned int level)410 file_check_mem(struct magic_set *ms, unsigned int level)
411 {
412 size_t len;
413
414 if (level >= ms->c.len) {
415 len = (ms->c.len += 20) * sizeof(*ms->c.li);
416 ms->c.li = (ms->c.li == NULL) ? emalloc(len) : erealloc(ms->c.li, len);
417 }
418 ms->c.li[level].got_match = 0;
419 #ifdef ENABLE_CONDITIONALS
420 ms->c.li[level].last_match = 0;
421 ms->c.li[level].last_cond = COND_NONE;
422 #endif /* ENABLE_CONDITIONALS */
423 return 0;
424 }
425
426 protected size_t
file_printedlen(const struct magic_set * ms)427 file_printedlen(const struct magic_set *ms)
428 {
429 return ms->o.buf == NULL ? 0 : strlen(ms->o.buf);
430 }
431
432
433 protected int
file_replace(struct magic_set * ms,const char * pat,const char * rep)434 file_replace(struct magic_set *ms, const char *pat, const char *rep)
435 {
436 zval *patt;
437 int opts = 0;
438 pcre_cache_entry *pce;
439 char *res;
440 zval *repl;
441 int res_len, rep_cnt = 0;
442 TSRMLS_FETCH();
443
444 MAKE_STD_ZVAL(patt);
445 ZVAL_STRINGL(patt, pat, strlen(pat), 0);
446 opts |= PCRE_MULTILINE;
447 convert_libmagic_pattern(patt, opts);
448 #if (PHP_MAJOR_VERSION < 6)
449 if ((pce = pcre_get_compiled_regex_cache(Z_STRVAL_P(patt), Z_STRLEN_P(patt) TSRMLS_CC)) == NULL) {
450 #else
451 if ((pce = pcre_get_compiled_regex_cache(IS_STRING, Z_STRVAL_P(patt), Z_STRLEN_P(patt) TSRMLS_CC)) == NULL) {
452 #endif
453 zval_dtor(patt);
454 FREE_ZVAL(patt);
455 return -1;
456 }
457
458 MAKE_STD_ZVAL(repl);
459 ZVAL_STRINGL(repl, rep, strlen(rep), 0);
460
461 res = php_pcre_replace_impl(pce, ms->o.buf, strlen(ms->o.buf), repl,
462 0, &res_len, -1, &rep_cnt TSRMLS_CC);
463
464 FREE_ZVAL(repl);
465 zval_dtor(patt);
466 FREE_ZVAL(patt);
467
468 if (NULL == res) {
469 return -1;
470 }
471
472 strncpy(ms->o.buf, res, res_len);
473 ms->o.buf[res_len] = '\0';
474
475 efree(res);
476
477 return rep_cnt;
478 }
479
480
