mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-28 11:57:28 +00:00
311 lines
8.1 KiB
C
311 lines
8.1 KiB
C
/*
|
|
* 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 1.45 2004/11/13 10:19:48 christos 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' (%s)",
|
|
fn, 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)strcpy(buf2, fn); /* take dir part */
|
|
buf2[tmp - fn + 1] = '\0';
|
|
(void)strcat(buf2, buf); /* 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;
|
|
}
|