1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
|
/* $OpenBSD: fsmagic.c,v 1.11 2005/05/18 03:11:18 jaredy Exp $ */
/*
* Copyright (c) Ian F. Darwin 1986-1995.
* Software written by Ian F. Darwin and others;
* maintained 1995-present by Christos Zoulas and others.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice immediately at the beginning of the file, without modification,
* this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* fsmagic - magic based on filesystem info - directory, special files, etc.
*/
#include "file.h"
#include "magic.h"
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <sys/stat.h>
/* Since major is a function on SVR4, we cannot use `ifndef major'. */
#ifdef MAJOR_IN_MKDEV
# include <sys/mkdev.h>
# define HAVE_MAJOR
#endif
#ifdef MAJOR_IN_SYSMACROS
# include <sys/sysmacros.h>
# define HAVE_MAJOR
#endif
#ifdef major /* Might be defined in sys/types.h. */
# define HAVE_MAJOR
#endif
#ifndef HAVE_MAJOR
# define major(dev) (((dev) >> 8) & 0xff)
# define minor(dev) ((dev) & 0xff)
#endif
#undef HAVE_MAJOR
#ifndef lint
FILE_RCSID("@(#)$Id: fsmagic.c,v 1.11 2005/05/18 03:11:18 jaredy Exp $")
#endif /* lint */
protected int
file_fsmagic(struct magic_set *ms, const char *fn, struct stat *sb)
{
int ret = 0;
#ifdef S_IFLNK
char buf[BUFSIZ+4];
int nch;
struct stat tstatbuf;
#endif
if (fn == NULL)
return 0;
/*
* Fstat is cheaper but fails for files you don't have read perms on.
* On 4.2BSD and similar systems, use lstat() to identify symlinks.
*/
#ifdef S_IFLNK
if ((ms->flags & MAGIC_SYMLINK) == 0)
ret = lstat(fn, sb);
else
#endif
ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
if (ret) {
if (ms->flags & MAGIC_ERROR) {
file_error(ms, errno, "cannot stat `%s'", fn);
return -1;
}
if (file_printf(ms, "cannot open (%s)",
strerror(errno)) == -1)
return -1;
return 1;
}
if ((ms->flags & MAGIC_MIME) != 0) {
if ((sb->st_mode & S_IFMT) != S_IFREG) {
if (file_printf(ms, "application/x-not-regular-file")
== -1)
return -1;
return 1;
}
}
else {
#ifdef S_ISUID
if (sb->st_mode & S_ISUID)
if (file_printf(ms, "setuid ") == -1)
return -1;
#endif
#ifdef S_ISGID
if (sb->st_mode & S_ISGID)
if (file_printf(ms, "setgid ") == -1)
return -1;
#endif
#ifdef S_ISVTX
if (sb->st_mode & S_ISVTX)
if (file_printf(ms, "sticky ") == -1)
return -1;
#endif
}
switch (sb->st_mode & S_IFMT) {
case S_IFDIR:
if (file_printf(ms, "directory") == -1)
return -1;
return 1;
#ifdef S_IFCHR
case S_IFCHR:
/*
* If -s has been specified, treat character special files
* like ordinary files. Otherwise, just report that they
* are block special files and go on to the next file.
*/
if ((ms->flags & MAGIC_DEVICES) != 0)
break;
#ifdef HAVE_ST_RDEV
# ifdef dv_unit
if (file_printf(ms, "character special (%d/%d/%d)",
major(sb->st_rdev), dv_unit(sb->st_rdev),
dv_subunit(sb->st_rdev)) == -1)
return -1;
# else
if (file_printf(ms, "character special (%ld/%ld)",
(long) major(sb->st_rdev), (long) minor(sb->st_rdev)) == -1)
return -1;
# endif
#else
if (file_printf(ms, "character special") == -1)
return -1;
#endif
return 1;
#endif
#ifdef S_IFBLK
case S_IFBLK:
/*
* If -s has been specified, treat block special files
* like ordinary files. Otherwise, just report that they
* are block special files and go on to the next file.
*/
if ((ms->flags & MAGIC_DEVICES) != 0)
break;
#ifdef HAVE_ST_RDEV
# ifdef dv_unit
if (file_printf(ms, "block special (%d/%d/%d)",
major(sb->st_rdev), dv_unit(sb->st_rdev),
dv_subunit(sb->st_rdev)) == -1)
return -1;
# else
if (file_printf(ms, "block special (%ld/%ld)",
(long)major(sb->st_rdev), (long)minor(sb->st_rdev)) == -1)
return -1;
# endif
#else
if (file_printf(ms, "block special") == -1)
return -1;
#endif
return 1;
#endif
/* TODO add code to handle V7 MUX and Blit MUX files */
#ifdef S_IFIFO
case S_IFIFO:
if (file_printf(ms, "fifo (named pipe)") == -1)
return -1;
return 1;
#endif
#ifdef S_IFDOOR
case S_IFDOOR:
if (file_printf(ms, "door") == -1)
return -1;
return 1;
#endif
#ifdef S_IFLNK
case S_IFLNK:
if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
if (ms->flags & MAGIC_ERROR) {
file_error(ms, errno, "unreadable symlink `%s'",
fn);
return -1;
}
if (file_printf(ms,
"unreadable symlink `%s' (%s)", fn,
strerror(errno)) == -1)
return -1;
return 1;
}
buf[nch] = '\0'; /* readlink(2) forgets this */
/* If broken symlink, say so and quit early. */
if (*buf == '/') {
if (stat(buf, &tstatbuf) < 0) {
if (ms->flags & MAGIC_ERROR) {
file_error(ms, errno,
"broken symbolic link to `%s'", buf);
return -1;
}
if (file_printf(ms, "broken symbolic link to `%s'",
buf) == -1)
return -1;
return 1;
}
}
else {
char *tmp;
char buf2[BUFSIZ+BUFSIZ+4];
if ((tmp = strrchr(fn, '/')) == NULL) {
tmp = buf; /* in current directory anyway */
} else {
if (tmp - fn + 1 > BUFSIZ) {
if (ms->flags & MAGIC_ERROR) {
file_error(ms, 0,
"path too long: `%s'", buf);
return -1;
}
if (file_printf(ms,
"path too long: `%s'", fn) == -1)
return -1;
return 1;
}
(void)strlcpy(buf2, fn, sizeof buf2); /* take dir part */
buf2[tmp - fn + 1] = '\0';
(void)strlcat(buf2, buf, sizeof buf2); /* plus (rel) link */
tmp = buf2;
}
if (stat(tmp, &tstatbuf) < 0) {
if (ms->flags & MAGIC_ERROR) {
file_error(ms, errno,
"broken symbolic link to `%s'",
buf);
return -1;
}
if (file_printf(ms,
"broken symbolic link to `%s'", buf) == -1)
return -1;
return 1;
}
}
/* Otherwise, handle it. */
if ((ms->flags & MAGIC_SYMLINK) != 0) {
const char *p;
ms->flags &= MAGIC_SYMLINK;
p = magic_file(ms, buf);
ms->flags |= MAGIC_SYMLINK;
return p != NULL ? 1 : -1;
} else { /* just print what it points to */
if (file_printf(ms, "symbolic link to `%s'",
buf) == -1)
return -1;
}
return 1;
#endif
#ifdef S_IFSOCK
#ifndef __COHERENT__
case S_IFSOCK:
if (file_printf(ms, "socket") == -1)
return -1;
return 1;
#endif
#endif
case S_IFREG:
break;
default:
file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
return -1;
/*NOTREACHED*/
}
/*
* regular file, check next possibility
*
* If stat() tells us the file has zero length, report here that
* the file is empty, so we can skip all the work of opening and
* reading the file.
* But if the -s option has been given, we skip this optimization,
* since on some systems, stat() reports zero size for raw disk
* partitions. (If the block special device really has zero length,
* the fact that it is empty will be detected and reported correctly
* when we read the file.)
*/
if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) {
if (file_printf(ms, (ms->flags & MAGIC_MIME) ?
"application/x-empty" : "empty") == -1)
return -1;
return 1;
}
return 0;
}
|
