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 1.77 2017/05/24 19:17:50 christos Exp $")
44 /* Since major is a function on SVR4, we cannot use `ifndef major'. */
46 # include <sys/mkdev.h>
49 #ifdef MAJOR_IN_SYSMACROS
50 # include <sys/sysmacros.h>
53 #ifdef major /* Might be defined in sys/types.h. */
57 # define WIN32_LEAN_AND_MEAN
62 # define major(dev) (((dev) >> 8) & 0xff)
63 # define minor(dev) ((dev) & 0xff)
68 bad_link(struct magic_set *ms, int err, char *buf)
70 int mime = ms->flags & MAGIC_MIME;
71 if ((mime & MAGIC_MIME_TYPE) &&
72 file_printf(ms, "inode/symlink")
76 if (ms->flags & MAGIC_ERROR) {
78 "broken symbolic link to %s", buf);
81 if (file_printf(ms, "broken symbolic link to %s", buf) == -1)
88 handle_mime(struct magic_set *ms, int mime, const char *str)
90 if ((mime & MAGIC_MIME_TYPE)) {
91 if (file_printf(ms, "inode/%s", str) == -1)
93 if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms,
97 if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms, "binary") == -1)
103 file_fsmagic(struct magic_set *ms, const char *fn, struct stat *sb)
106 int mime = ms->flags & MAGIC_MIME;
107 int silent = ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION);
111 struct stat tstatbuf;
117 #define COMMA (did++ ? ", " : "")
119 * Fstat is cheaper but fails for files you don't have read perms on.
120 * On 4.2BSD and similar systems, use lstat() to identify symlinks.
123 if ((ms->flags & MAGIC_SYMLINK) == 0)
127 ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
131 HANDLE hFile = CreateFile((LPCSTR)fn, 0, FILE_SHARE_DELETE |
132 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0,
134 if (hFile != INVALID_HANDLE_VALUE) {
136 * Stat failed, but we can still open it - assume it's
137 * a block device, if nothing else.
140 sb->st_mode = S_IFBLK;
143 switch (GetFileType(hFile)) {
145 sb->st_mode |= S_IFCHR;
146 sb->st_mode &= ~S_IFREG;
149 sb->st_mode |= S_IFIFO;
150 sb->st_mode &= ~S_IFREG;
159 if (ms->flags & MAGIC_ERROR) {
160 file_error(ms, errno, "cannot stat `%s'", fn);
163 if (file_printf(ms, "cannot open `%s' (%s)",
164 fn, strerror(errno)) == -1)
170 if (!mime && !silent) {
172 if (sb->st_mode & S_ISUID)
173 if (file_printf(ms, "%ssetuid", COMMA) == -1)
177 if (sb->st_mode & S_ISGID)
178 if (file_printf(ms, "%ssetgid", COMMA) == -1)
182 if (sb->st_mode & S_ISVTX)
183 if (file_printf(ms, "%ssticky", COMMA) == -1)
188 switch (sb->st_mode & S_IFMT) {
191 if (handle_mime(ms, mime, "directory") == -1)
194 } else if (file_printf(ms, "%sdirectory", COMMA) == -1)
200 * If -s has been specified, treat character special files
201 * like ordinary files. Otherwise, just report that they
202 * are block special files and go on to the next file.
204 if ((ms->flags & MAGIC_DEVICES) != 0) {
209 if (handle_mime(ms, mime, "chardevice") == -1)
213 #ifdef HAVE_STRUCT_STAT_ST_RDEV
215 if (file_printf(ms, "%scharacter special (%d/%d/%d)",
216 COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev),
217 dv_subunit(sb->st_rdev)) == -1)
220 if (file_printf(ms, "%scharacter special (%ld/%ld)",
221 COMMA, (long)major(sb->st_rdev),
222 (long)minor(sb->st_rdev)) == -1)
226 if (file_printf(ms, "%scharacter special", COMMA) == -1)
235 * If -s has been specified, treat block special files
236 * like ordinary files. Otherwise, just report that they
237 * are block special files and go on to the next file.
239 if ((ms->flags & MAGIC_DEVICES) != 0) {
244 if (handle_mime(ms, mime, "blockdevice") == -1)
248 #ifdef HAVE_STRUCT_STAT_ST_RDEV
250 if (file_printf(ms, "%sblock special (%d/%d/%d)",
251 COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev),
252 dv_subunit(sb->st_rdev)) == -1)
255 if (file_printf(ms, "%sblock special (%ld/%ld)",
256 COMMA, (long)major(sb->st_rdev),
257 (long)minor(sb->st_rdev)) == -1)
261 if (file_printf(ms, "%sblock special", COMMA) == -1)
267 /* TODO add code to handle V7 MUX and Blit MUX files */
270 if((ms->flags & MAGIC_DEVICES) != 0)
273 if (handle_mime(ms, mime, "fifo") == -1)
276 } else if (file_printf(ms, "%sfifo (named pipe)", COMMA) == -1)
283 if (handle_mime(ms, mime, "door") == -1)
286 } else if (file_printf(ms, "%sdoor", COMMA) == -1)
292 if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
293 if (ms->flags & MAGIC_ERROR) {
294 file_error(ms, errno, "unreadable symlink `%s'",
299 if (handle_mime(ms, mime, "symlink") == -1)
302 } else if (file_printf(ms,
303 "%sunreadable symlink `%s' (%s)", COMMA, fn,
304 strerror(errno)) == -1)
308 buf[nch] = '\0'; /* readlink(2) does not do this */
310 /* If broken symlink, say so and quit early. */
312 if (stat(buf, &tstatbuf) < 0)
313 return bad_link(ms, errno, buf);
316 char buf2[BUFSIZ+BUFSIZ+4];
318 if ((tmp = strrchr(fn, '/')) == NULL) {
319 tmp = buf; /* in current directory anyway */
321 if (tmp - fn + 1 > BUFSIZ) {
322 if (ms->flags & MAGIC_ERROR) {
324 "path too long: `%s'", buf);
328 if (handle_mime(ms, mime,
329 "x-path-too-long") == -1)
332 } else if (file_printf(ms,
333 "%spath too long: `%s'", COMMA,
339 (void)strlcpy(buf2, fn, sizeof buf2);
340 buf2[tmp - fn + 1] = '\0';
341 /* plus (rel) link */
342 (void)strlcat(buf2, buf, sizeof buf2);
345 if (stat(tmp, &tstatbuf) < 0)
346 return bad_link(ms, errno, buf);
349 /* Otherwise, handle it. */
350 if ((ms->flags & MAGIC_SYMLINK) != 0) {
352 ms->flags &= MAGIC_SYMLINK;
353 p = magic_file(ms, buf);
354 ms->flags |= MAGIC_SYMLINK;
357 } else { /* just print what it points to */
359 if (handle_mime(ms, mime, "symlink") == -1)
362 } else if (file_printf(ms, "%ssymbolic link to %s",
372 if (handle_mime(ms, mime, "socket") == -1)
375 } else if (file_printf(ms, "%ssocket", COMMA) == -1)
382 * regular file, check next possibility
384 * If stat() tells us the file has zero length, report here that
385 * the file is empty, so we can skip all the work of opening and
387 * But if the -s option has been given, we skip this
388 * optimization, since on some systems, stat() reports zero
389 * size for raw disk partitions. (If the block special device
390 * really has zero length, the fact that it is empty will be
391 * detected and reported correctly when we read the file.)
393 if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) {
395 if (handle_mime(ms, mime, "x-empty") == -1)
398 } else if (file_printf(ms, "%sempty", COMMA) == -1)
406 file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
411 if (!silent && !mime && did && ret == 0) {
412 if (file_printf(ms, " ") == -1)