2 * Copyright (c) Ian F. Darwin 1986-1995.
3 * Software written by Ian F. Darwin and others;
4 * maintained 1995-present by Christos Zoulas and others.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice immediately at the beginning of the file, without modification,
11 * this list of conditions, and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * fsmagic - magic based on filesystem info - directory, special files, etc.
35 FILE_RCSID("@(#)$File: fsmagic.c,v 1.82 2022/04/11 18:14:41 christos Exp $")
44 /* Since major is a function on SVR4, we cannot use `ifndef major'. */
46 # include <sys/mkdev.h>
49 #ifdef HAVE_SYS_SYSMACROS_H
50 # include <sys/sysmacros.h>
52 #ifdef MAJOR_IN_SYSMACROS
55 #if defined(major) && !defined(HAVE_MAJOR)
56 /* Might be defined in sys/types.h. */
60 # define WIN32_LEAN_AND_MEAN
65 # define major(dev) (((dev) >> 8) & 0xff)
66 # define minor(dev) ((dev) & 0xff)
71 bad_link(struct magic_set
*ms
, int err
, char *buf
)
73 int mime
= ms
->flags
& MAGIC_MIME
;
74 if ((mime
& MAGIC_MIME_TYPE
) &&
75 file_printf(ms
, "inode/symlink")
79 if (ms
->flags
& MAGIC_ERROR
) {
81 "broken symbolic link to %s", buf
);
84 if (file_printf(ms
, "broken symbolic link to %s", buf
) == -1)
91 handle_mime(struct magic_set
*ms
, int mime
, const char *str
)
93 if ((mime
& MAGIC_MIME_TYPE
)) {
94 if (file_printf(ms
, "inode/%s", str
) == -1)
96 if ((mime
& MAGIC_MIME_ENCODING
) && file_printf(ms
,
100 if ((mime
& MAGIC_MIME_ENCODING
) && file_printf(ms
, "binary") == -1)
106 file_fsmagic(struct magic_set
*ms
, const char *fn
, struct stat
*sb
)
109 int mime
= ms
->flags
& MAGIC_MIME
;
110 int silent
= ms
->flags
& (MAGIC_APPLE
|MAGIC_EXTENSION
);
114 struct stat tstatbuf
;
120 #define COMMA (did++ ? ", " : "")
122 * Fstat is cheaper but fails for files you don't have read perms on.
123 * On 4.2BSD and similar systems, use lstat() to identify symlinks.
126 if ((ms
->flags
& MAGIC_SYMLINK
) == 0)
130 ret
= stat(fn
, sb
); /* don't merge into if; see "ret =" above */
134 HANDLE hFile
= CreateFile((LPCSTR
)fn
, 0, FILE_SHARE_DELETE
|
135 FILE_SHARE_READ
| FILE_SHARE_WRITE
, NULL
, OPEN_EXISTING
, 0,
137 if (hFile
!= INVALID_HANDLE_VALUE
) {
139 * Stat failed, but we can still open it - assume it's
140 * a block device, if nothing else.
143 sb
->st_mode
= S_IFBLK
;
146 switch (GetFileType(hFile
)) {
148 sb
->st_mode
|= S_IFCHR
;
149 sb
->st_mode
&= ~S_IFREG
;
152 sb
->st_mode
|= S_IFIFO
;
153 sb
->st_mode
&= ~S_IFREG
;
162 if (ms
->flags
& MAGIC_ERROR
) {
163 file_error(ms
, errno
, "cannot stat `%s'", fn
);
166 if (file_printf(ms
, "cannot open `%s' (%s)",
167 fn
, strerror(errno
)) == -1)
173 if (!mime
&& !silent
) {
175 if (sb
->st_mode
& S_ISUID
)
176 if (file_printf(ms
, "%ssetuid", COMMA
) == -1)
180 if (sb
->st_mode
& S_ISGID
)
181 if (file_printf(ms
, "%ssetgid", COMMA
) == -1)
185 if (sb
->st_mode
& S_ISVTX
)
186 if (file_printf(ms
, "%ssticky", COMMA
) == -1)
191 switch (sb
->st_mode
& S_IFMT
) {
194 if (handle_mime(ms
, mime
, "directory") == -1)
197 } else if (file_printf(ms
, "%sdirectory", COMMA
) == -1)
203 * If -s has been specified, treat character special files
204 * like ordinary files. Otherwise, just report that they
205 * are block special files and go on to the next file.
207 if ((ms
->flags
& MAGIC_DEVICES
) != 0) {
212 if (handle_mime(ms
, mime
, "chardevice") == -1)
216 #ifdef HAVE_STRUCT_STAT_ST_RDEV
218 if (file_printf(ms
, "%scharacter special (%d/%d/%d)",
219 COMMA
, major(sb
->st_rdev
), dv_unit(sb
->st_rdev
),
220 dv_subunit(sb
->st_rdev
)) == -1)
223 if (file_printf(ms
, "%scharacter special (%ld/%ld)",
224 COMMA
, (long)major(sb
->st_rdev
),
225 (long)minor(sb
->st_rdev
)) == -1)
229 if (file_printf(ms
, "%scharacter special", COMMA
) == -1)
238 * If -s has been specified, treat block special files
239 * like ordinary files. Otherwise, just report that they
240 * are block special files and go on to the next file.
242 if ((ms
->flags
& MAGIC_DEVICES
) != 0) {
247 if (handle_mime(ms
, mime
, "blockdevice") == -1)
251 #ifdef HAVE_STRUCT_STAT_ST_RDEV
253 if (file_printf(ms
, "%sblock special (%d/%d/%d)",
254 COMMA
, major(sb
->st_rdev
), dv_unit(sb
->st_rdev
),
255 dv_subunit(sb
->st_rdev
)) == -1)
258 if (file_printf(ms
, "%sblock special (%ld/%ld)",
259 COMMA
, (long)major(sb
->st_rdev
),
260 (long)minor(sb
->st_rdev
)) == -1)
264 if (file_printf(ms
, "%sblock special", COMMA
) == -1)
270 /* TODO add code to handle V7 MUX and Blit MUX files */
273 if((ms
->flags
& MAGIC_DEVICES
) != 0)
276 if (handle_mime(ms
, mime
, "fifo") == -1)
279 } else if (file_printf(ms
, "%sfifo (named pipe)", COMMA
) == -1)
286 if (handle_mime(ms
, mime
, "door") == -1)
289 } else if (file_printf(ms
, "%sdoor", COMMA
) == -1)
295 if ((nch
= readlink(fn
, buf
, BUFSIZ
-1)) <= 0) {
296 if (ms
->flags
& MAGIC_ERROR
) {
297 file_error(ms
, errno
, "unreadable symlink `%s'",
302 if (handle_mime(ms
, mime
, "symlink") == -1)
305 } else if (file_printf(ms
,
306 "%sunreadable symlink `%s' (%s)", COMMA
, fn
,
307 strerror(errno
)) == -1)
311 buf
[nch
] = '\0'; /* readlink(2) does not do this */
313 /* If broken symlink, say so and quit early. */
316 * linux procfs/devfs makes symlinks like pipe:[3515864880]
317 * that we can't stat their readlink output, so stat the
318 * original filename instead.
320 if (stat(fn
, &tstatbuf
) < 0)
321 return bad_link(ms
, errno
, buf
);
324 if (stat(buf
, &tstatbuf
) < 0)
325 return bad_link(ms
, errno
, buf
);
328 char buf2
[BUFSIZ
+BUFSIZ
+4];
330 if ((tmp
= CCAST(char *, strrchr(fn
, '/'))) == NULL
) {
331 tmp
= buf
; /* in current directory anyway */
333 if (tmp
- fn
+ 1 > BUFSIZ
) {
334 if (ms
->flags
& MAGIC_ERROR
) {
336 "path too long: `%s'", buf
);
340 if (handle_mime(ms
, mime
,
341 "x-path-too-long") == -1)
344 } else if (file_printf(ms
,
345 "%spath too long: `%s'", COMMA
,
351 (void)strlcpy(buf2
, fn
, sizeof buf2
);
352 buf2
[tmp
- fn
+ 1] = '\0';
353 /* plus (rel) link */
354 (void)strlcat(buf2
, buf
, sizeof buf2
);
357 if (stat(tmp
, &tstatbuf
) < 0)
358 return bad_link(ms
, errno
, buf
);
362 /* Otherwise, handle it. */
363 if ((ms
->flags
& MAGIC_SYMLINK
) != 0) {
365 ms
->flags
&= MAGIC_SYMLINK
;
366 p
= magic_file(ms
, buf
);
367 ms
->flags
|= MAGIC_SYMLINK
;
370 } else { /* just print what it points to */
372 if (handle_mime(ms
, mime
, "symlink") == -1)
375 } else if (file_printf(ms
, "%ssymbolic link to %s",
385 if (handle_mime(ms
, mime
, "socket") == -1)
388 } else if (file_printf(ms
, "%ssocket", COMMA
) == -1)
395 * regular file, check next possibility
397 * If stat() tells us the file has zero length, report here that
398 * the file is empty, so we can skip all the work of opening and
400 * But if the -s option has been given, we skip this
401 * optimization, since on some systems, stat() reports zero
402 * size for raw disk partitions. (If the block special device
403 * really has zero length, the fact that it is empty will be
404 * detected and reported correctly when we read the file.)
406 if ((ms
->flags
& MAGIC_DEVICES
) == 0 && sb
->st_size
== 0) {
408 if (handle_mime(ms
, mime
, "x-empty") == -1)
411 } else if (file_printf(ms
, "%sempty", COMMA
) == -1)
419 file_error(ms
, 0, "invalid mode 0%o", sb
->st_mode
);
424 if (!silent
&& !mime
&& did
&& ret
== 0) {
425 if (file_printf(ms
, " ") == -1)
429 * If we were looking for extensions or apple (silent) it is not our
430 * job to print here, so don't count this as a match.
432 if (ret
== 1 && silent
)