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1.1 misho 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
1.1.1.3 ! misho 30: FILE_RCSID("@(#)$File: funcs.c,v 1.61 2012/10/30 23:11:51 christos Exp $")
1.1 misho 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:
1.1.1.2 misho 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:
1.1 misho 55: /*
56: * Like printf, only we append to a buffer.
57: */
58: protected int
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
87: file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
1.1.1.2 misho 88: size_t lineno)
1.1 misho 89: {
90: char *buf = NULL;
91:
92: /* Only the first error is ok */
1.1.1.2 misho 93: if (ms->event_flags & EVENT_HAD_ERR)
1.1 misho 94: return;
95: if (lineno != 0) {
96: efree(ms->o.buf);
97: ms->o.buf = NULL;
1.1.1.2 misho 98: file_printf(ms, "line %" SIZE_T_FORMAT "u: ", lineno);
1.1 misho 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
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
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
142: file_oomem(struct magic_set *ms, size_t len)
143: {
1.1.1.2 misho 144: file_error(ms, errno, "cannot allocate %" SIZE_T_FORMAT "u bytes",
145: len);
1.1 misho 146: }
147:
148: protected void
149: file_badseek(struct magic_set *ms)
150: {
151: file_error(ms, errno, "error seeking");
152: }
153:
154: protected void
155: file_badread(struct magic_set *ms)
156: {
157: file_error(ms, errno, "error reading");
158: }
159:
160: protected int
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;
1.1.1.2 misho 166: const unsigned char *ubuf = CAST(const unsigned char *, buf);
1.1 misho 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:
1.1.1.3 ! misho 194: #ifdef __EMX__
1.1 misho 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;
1.1.1.2 misho 213: }
1.1 misho 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)
1.1.1.2 misho 238: if ((m = file_softmagic(ms, ubuf, nb, BINTEST,
239: looks_text)) != 0) {
1.1 misho 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:
1.1.1.2 misho 263: /* try text properties */
1.1 misho 264: if ((ms->flags & MAGIC_NO_CHECK_TEXT) == 0) {
265:
1.1.1.2 misho 266: if ((m = file_ascmagic(ms, ubuf, nb, looks_text)) != 0) {
1.1 misho 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,
1.1.1.2 misho 276: nb, u8buf, ulen, code, type, looks_text))
277: != 0) {
1.1 misho 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: }
1.1.1.2 misho 300: free(u8buf);
1.1 misho 301: if (rv)
302: return rv;
303:
304: return m;
305: }
306:
307: protected int
308: file_reset(struct magic_set *ms)
309: {
1.1.1.3 ! misho 310: if (ms->mlist[0] == NULL) {
1.1 misho 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 *
336: file_getbuffer(struct magic_set *ms)
337: {
1.1.1.3 ! misho 338: char *op, *np;
1.1 misho 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;
1.1.1.3 ! misho 356: if ((ms->o.pbuf = CAST(char *, erealloc(ms->o.pbuf, psize))) == NULL) {
! 357: file_oomem(ms, psize);
! 358: return NULL;
! 359: }
1.1 misho 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:
1.1.1.2 misho 400: for (np = ms->o.pbuf, op = ms->o.buf; *op;) {
1.1 misho 401: if (isprint((unsigned char)*op)) {
1.1.1.2 misho 402: *np++ = *op++;
1.1 misho 403: } else {
404: OCTALIFY(np, op);
405: }
406: }
407: *np = '\0';
408: return ms->o.pbuf;
409: }
410:
411: protected int
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) * sizeof(*ms->c.li);
1.1.1.3 ! misho 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: }
1.1 misho 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: }
1.1.1.2 misho 433:
434: protected size_t
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
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;
1.1.1.3 ! misho 449: int res_len, rep_cnt = 0;
1.1.1.2 misho 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: