Annotation of embedaddon/php/ext/fileinfo/libmagic/magic.c, revision 1.1.1.3
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:
28: #include "file.h"
29:
30: #ifndef lint
1.1.1.3 ! misho 31: FILE_RCSID("@(#)$File: magic.c,v 1.78 2013/01/07 18:20:19 christos Exp $")
1.1 misho 32: #endif /* lint */
33:
34: #include "magic.h"
35:
36: #include <stdlib.h>
37: #ifdef PHP_WIN32
38: #include "win32/unistd.h"
39: #else
40: #include <unistd.h>
41: #endif
42: #include <string.h>
43: #ifdef PHP_WIN32
44: # include "config.w32.h"
45: #else
46: # include "php_config.h"
47: #endif
48:
1.1.1.2 misho 49: #ifdef PHP_WIN32
50: #include <shlwapi.h>
51: #endif
52:
1.1 misho 53: #include <limits.h> /* for PIPE_BUF */
54:
55: #if defined(HAVE_UTIMES)
56: # include <sys/time.h>
57: #elif defined(HAVE_UTIME)
58: # if defined(HAVE_SYS_UTIME_H)
59: # include <sys/utime.h>
60: # elif defined(HAVE_UTIME_H)
61: # include <utime.h>
62: # endif
63: #endif
64:
65: #ifdef HAVE_UNISTD_H
66: #include <unistd.h> /* for read() */
67: #endif
68:
69: #ifndef PIPE_BUF
70: /* Get the PIPE_BUF from pathconf */
71: #ifdef _PC_PIPE_BUF
72: #define PIPE_BUF pathconf(".", _PC_PIPE_BUF)
73: #else
74: #define PIPE_BUF 512
75: #endif
76: #endif
77:
78: #ifdef PHP_WIN32
79: # undef S_IFLNK
80: # undef S_IFIFO
81: #endif
82:
83: private void close_and_restore(const struct magic_set *, const char *, int,
84: const struct stat *);
85: private int unreadable_info(struct magic_set *, mode_t, const char *);
1.1.1.3 ! misho 86: #if 0
1.1.1.2 misho 87: private const char* get_default_magic(void);
1.1.1.3 ! misho 88: #endif
1.1 misho 89: private const char *file_or_stream(struct magic_set *, const char *, php_stream *);
90:
91: #ifndef STDIN_FILENO
92: #define STDIN_FILENO 0
93: #endif
94:
1.1.1.2 misho 95: /* XXX this functionality is excluded in php, enable it in apprentice.c:340 */
96: #if 0
97: private const char *
98: get_default_magic(void)
99: {
100: static const char hmagic[] = "/.magic/magic.mgc";
101: static char *default_magic;
102: char *home, *hmagicpath;
103:
104: #ifndef PHP_WIN32
105: struct stat st;
106:
107: if (default_magic) {
108: free(default_magic);
109: default_magic = NULL;
110: }
111: if ((home = getenv("HOME")) == NULL)
112: return MAGIC;
113:
1.1.1.3 ! misho 114: if (asprintf(&hmagicpath, "%s/.magic.mgc", home) < 0)
! 115: return MAGIC;
! 116: if (stat(hmagicpath, &st) == -1) {
! 117: free(hmagicpath);
1.1.1.2 misho 118: if (asprintf(&hmagicpath, "%s/.magic", home) < 0)
119: return MAGIC;
120: if (stat(hmagicpath, &st) == -1)
121: goto out;
122: if (S_ISDIR(st.st_mode)) {
123: free(hmagicpath);
124: if (asprintf(&hmagicpath, "%s/%s", home, hmagic) < 0)
125: return MAGIC;
126: if (access(hmagicpath, R_OK) == -1)
127: goto out;
128: }
1.1.1.3 ! misho 129: }
1.1.1.2 misho 130:
131: if (asprintf(&default_magic, "%s:%s", hmagicpath, MAGIC) < 0)
132: goto out;
133: free(hmagicpath);
134: return default_magic;
135: out:
136: default_magic = NULL;
137: free(hmagicpath);
138: return MAGIC;
139: #else
140: char *hmagicp = hmagicpath;
141: char *tmppath = NULL;
142: LPTSTR dllpath;
143:
144: #define APPENDPATH() \
145: do { \
146: if (tmppath && access(tmppath, R_OK) != -1) { \
147: if (hmagicpath == NULL) \
148: hmagicpath = tmppath; \
149: else { \
150: if (asprintf(&hmagicp, "%s%c%s", hmagicpath, \
151: PATHSEP, tmppath) >= 0) { \
152: free(hmagicpath); \
153: hmagicpath = hmagicp; \
154: } \
155: free(tmppath); \
156: } \
157: tmppath = NULL; \
158: } \
159: } while (/*CONSTCOND*/0)
160:
161: if (default_magic) {
162: free(default_magic);
163: default_magic = NULL;
164: }
165:
166: /* First, try to get user-specific magic file */
167: if ((home = getenv("LOCALAPPDATA")) == NULL) {
168: if ((home = getenv("USERPROFILE")) != NULL)
169: if (asprintf(&tmppath,
170: "%s/Local Settings/Application Data%s", home,
171: hmagic) < 0)
172: tmppath = NULL;
173: } else {
174: if (asprintf(&tmppath, "%s%s", home, hmagic) < 0)
175: tmppath = NULL;
176: }
177:
178: APPENDPATH();
179:
180: /* Second, try to get a magic file from Common Files */
181: if ((home = getenv("COMMONPROGRAMFILES")) != NULL) {
182: if (asprintf(&tmppath, "%s%s", home, hmagic) >= 0)
183: APPENDPATH();
184: }
185:
186: /* Third, try to get magic file relative to dll location */
187: dllpath = malloc(sizeof(*dllpath) * (MAX_PATH + 1));
188: dllpath[MAX_PATH] = 0; /* just in case long path gets truncated and not null terminated */
189: if (GetModuleFileNameA(NULL, dllpath, MAX_PATH)){
190: PathRemoveFileSpecA(dllpath);
191: if (strlen(dllpath) > 3 &&
192: stricmp(&dllpath[strlen(dllpath) - 3], "bin") == 0) {
193: if (asprintf(&tmppath,
194: "%s/../share/misc/magic.mgc", dllpath) >= 0)
195: APPENDPATH();
196: } else {
197: if (asprintf(&tmppath,
198: "%s/share/misc/magic.mgc", dllpath) >= 0)
199: APPENDPATH();
200: else if (asprintf(&tmppath,
201: "%s/magic.mgc", dllpath) >= 0)
202: APPENDPATH();
203: }
204: }
205:
206: /* Don't put MAGIC constant - it likely points to a file within MSys
207: tree */
208: default_magic = hmagicpath;
209: return default_magic;
210: #endif
211: }
212:
213: public const char *
214: magic_getpath(const char *magicfile, int action)
215: {
216: if (magicfile != NULL)
217: return magicfile;
218:
219: magicfile = getenv("MAGIC");
220: if (magicfile != NULL)
221: return magicfile;
222:
223: return action == FILE_LOAD ? get_default_magic() : MAGIC;
224: }
225: #endif
226:
1.1 misho 227: public struct magic_set *
228: magic_open(int flags)
229: {
1.1.1.3 ! misho 230: return file_ms_alloc(flags);
1.1 misho 231: }
232:
233: private int
234: unreadable_info(struct magic_set *ms, mode_t md, const char *file)
235: {
236: /* We cannot open it, but we were able to stat it. */
237: if (access(file, W_OK) == 0)
238: if (file_printf(ms, "writable, ") == -1)
239: return -1;
240: if (access(file, X_OK) == 0)
241: if (file_printf(ms, "executable, ") == -1)
242: return -1;
243: if (S_ISREG(md))
244: if (file_printf(ms, "regular file, ") == -1)
245: return -1;
246: if (file_printf(ms, "no read permission") == -1)
247: return -1;
248: return 0;
249: }
250:
251: public void
252: magic_close(struct magic_set *ms)
253: {
1.1.1.3 ! misho 254: if (ms == NULL)
! 255: return;
! 256: file_ms_free(ms);
1.1 misho 257: }
258:
259: /*
260: * load a magic file
261: */
262: public int
263: magic_load(struct magic_set *ms, const char *magicfile)
264: {
1.1.1.3 ! misho 265: if (ms == NULL)
1.1 misho 266: return -1;
1.1.1.3 ! misho 267: return file_apprentice(ms, magicfile, FILE_LOAD);
1.1 misho 268: }
269:
270: public int
271: magic_compile(struct magic_set *ms, const char *magicfile)
272: {
1.1.1.3 ! misho 273: if (ms == NULL)
! 274: return -1;
! 275: return file_apprentice(ms, magicfile, FILE_COMPILE);
1.1 misho 276: }
277:
1.1.1.2 misho 278:
279: public int
280: magic_list(struct magic_set *ms, const char *magicfile)
281: {
1.1.1.3 ! misho 282: if (ms == NULL)
! 283: return -1;
! 284: return file_apprentice(ms, magicfile, FILE_LIST);
1.1.1.2 misho 285: }
286:
1.1 misho 287: private void
288: close_and_restore(const struct magic_set *ms, const char *name, int fd,
289: const struct stat *sb)
290: {
291:
292: if ((ms->flags & MAGIC_PRESERVE_ATIME) != 0) {
293: /*
294: * Try to restore access, modification times if read it.
295: * This is really *bad* because it will modify the status
296: * time of the file... And of course this will affect
297: * backup programs
298: */
299: #ifdef HAVE_UTIMES
300: struct timeval utsbuf[2];
301: (void)memset(utsbuf, 0, sizeof(utsbuf));
302: utsbuf[0].tv_sec = sb->st_atime;
303: utsbuf[1].tv_sec = sb->st_mtime;
304:
305: (void) utimes(name, utsbuf); /* don't care if loses */
306: #elif defined(HAVE_UTIME_H) || defined(HAVE_SYS_UTIME_H)
307: struct utimbuf utbuf;
308:
309: (void)memset(&utbuf, 0, sizeof(utbuf));
310: utbuf.actime = sb->st_atime;
311: utbuf.modtime = sb->st_mtime;
312: (void) utime(name, &utbuf); /* don't care if loses */
313: #endif
314: }
315: }
316:
317:
318: /*
319: * find type of descriptor
320: */
321: public const char *
322: magic_descriptor(struct magic_set *ms, int fd)
323: {
1.1.1.3 ! misho 324: if (ms == NULL)
! 325: return NULL;
1.1 misho 326: return file_or_stream(ms, NULL, NULL);
327: }
328:
329: /*
330: * find type of named file
331: */
332: public const char *
333: magic_file(struct magic_set *ms, const char *inname)
334: {
1.1.1.3 ! misho 335: if (ms == NULL)
! 336: return NULL;
1.1 misho 337: return file_or_stream(ms, inname, NULL);
338: }
339:
340: public const char *
341: magic_stream(struct magic_set *ms, php_stream *stream)
342: {
1.1.1.3 ! misho 343: if (ms == NULL)
! 344: return NULL;
1.1 misho 345: return file_or_stream(ms, NULL, stream);
346: }
347:
348: private const char *
349: file_or_stream(struct magic_set *ms, const char *inname, php_stream *stream)
350: {
351: int rv = -1;
352: unsigned char *buf;
353: struct stat sb;
354: ssize_t nbytes = 0; /* number of bytes read from a datafile */
355: int no_in_stream = 0;
356: TSRMLS_FETCH();
357:
358: if (!inname && !stream) {
359: return NULL;
360: }
361:
362: /*
363: * one extra for terminating '\0', and
364: * some overlapping space for matches near EOF
365: */
366: #define SLOP (1 + sizeof(union VALUETYPE))
367: buf = emalloc(HOWMANY + SLOP);
368:
1.1.1.2 misho 369: if (file_reset(ms) == -1)
1.1 misho 370: goto done;
371:
372: switch (file_fsmagic(ms, inname, &sb, stream)) {
1.1.1.2 misho 373: case -1: /* error */
374: goto done;
375: case 0: /* nothing found */
376: break;
377: default: /* matched it and printed type */
378: rv = 0;
379: goto done;
1.1 misho 380: }
381:
382: errno = 0;
383:
384: if (!stream && inname) {
385: no_in_stream = 1;
386: #if PHP_API_VERSION < 20100412
387: stream = php_stream_open_wrapper((char *)inname, "rb", REPORT_ERRORS|ENFORCE_SAFE_MODE, NULL);
388: #else
389: stream = php_stream_open_wrapper((char *)inname, "rb", REPORT_ERRORS, NULL);
390: #endif
391: }
392:
393: if (!stream) {
394: if (unreadable_info(ms, sb.st_mode, inname) == -1)
395: goto done;
396: rv = 0;
397: goto done;
398: }
399:
400: #ifdef O_NONBLOCK
401: /* we should be already be in non blocking mode for network socket */
402: #endif
403:
404: /*
405: * try looking at the first HOWMANY bytes
406: */
407: if ((nbytes = php_stream_read(stream, (char *)buf, HOWMANY)) < 0) {
408: file_error(ms, errno, "cannot read `%s'", inname);
409: goto done;
410: }
411:
412: (void)memset(buf + nbytes, 0, SLOP); /* NUL terminate */
413: if (file_buffer(ms, stream, inname, buf, (size_t)nbytes) == -1)
414: goto done;
415: rv = 0;
416: done:
417: efree(buf);
418:
419: if (no_in_stream && stream) {
420: php_stream_close(stream);
421: }
422:
423: close_and_restore(ms, inname, 0, &sb);
424: return rv == 0 ? file_getbuffer(ms) : NULL;
425: }
426:
1.1.1.2 misho 427:
1.1 misho 428: public const char *
429: magic_buffer(struct magic_set *ms, const void *buf, size_t nb)
430: {
1.1.1.3 ! misho 431: if (ms == NULL)
! 432: return NULL;
1.1 misho 433: if (file_reset(ms) == -1)
434: return NULL;
435: /*
436: * The main work is done here!
437: * We have the file name and/or the data buffer to be identified.
438: */
439: if (file_buffer(ms, NULL, NULL, buf, nb) == -1) {
440: return NULL;
441: }
442: return file_getbuffer(ms);
443: }
444:
445: public const char *
446: magic_error(struct magic_set *ms)
447: {
1.1.1.3 ! misho 448: if (ms == NULL)
! 449: return "Magic database is not open";
1.1 misho 450: return (ms->event_flags & EVENT_HAD_ERR) ? ms->o.buf : NULL;
451: }
452:
453: public int
454: magic_errno(struct magic_set *ms)
455: {
1.1.1.3 ! misho 456: if (ms == NULL)
! 457: return EINVAL;
1.1 misho 458: return (ms->event_flags & EVENT_HAD_ERR) ? ms->error : 0;
459: }
460:
461: public int
462: magic_setflags(struct magic_set *ms, int flags)
463: {
1.1.1.3 ! misho 464: if (ms == NULL)
! 465: return -1;
1.1 misho 466: #if !defined(HAVE_UTIME) && !defined(HAVE_UTIMES)
467: if (flags & MAGIC_PRESERVE_ATIME)
468: return -1;
469: #endif
470: ms->flags = flags;
471: return 0;
472: }
1.1.1.3 ! misho 473:
! 474: public int
! 475: magic_version(void)
! 476: {
! 477: return MAGIC_VERSION;
! 478: }
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