361 lines
9.3 KiB
C
361 lines
9.3 KiB
C
/*
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* Copyright (c) Ian F. Darwin 1986-1995.
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* Software written by Ian F. Darwin and others;
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* maintained 1995-present by Christos Zoulas and others.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* fsmagic - magic based on filesystem info - directory, special files, etc.
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*/
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#include "file.h"
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#ifndef lint
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FILE_RCSID("@(#)$File: fsmagic.c,v 1.64 2011/08/14 09:03:12 christos Exp $")
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#endif /* lint */
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#include "magic.h"
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdlib.h>
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/* Since major is a function on SVR4, we cannot use `ifndef major'. */
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#ifdef MAJOR_IN_MKDEV
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# include <sys/mkdev.h>
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# define HAVE_MAJOR
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#endif
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#ifdef MAJOR_IN_SYSMACROS
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# include <sys/sysmacros.h>
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# define HAVE_MAJOR
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#endif
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#ifdef major /* Might be defined in sys/types.h. */
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# define HAVE_MAJOR
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#endif
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#ifndef HAVE_MAJOR
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# define major(dev) (((dev) >> 8) & 0xff)
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# define minor(dev) ((dev) & 0xff)
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#endif
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#undef HAVE_MAJOR
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#ifdef S_IFLNK
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private int
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bad_link(struct magic_set *ms, int err, char *buf)
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{
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int mime = ms->flags & MAGIC_MIME;
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if ((mime & MAGIC_MIME_TYPE) &&
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file_printf(ms, "inode/symlink")
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== -1)
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return -1;
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else if (!mime) {
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if (ms->flags & MAGIC_ERROR) {
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file_error(ms, err,
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"broken symbolic link to `%s'", buf);
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return -1;
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}
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if (file_printf(ms, "broken symbolic link to `%s'", buf) == -1)
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return -1;
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}
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return 1;
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}
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#endif
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private int
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handle_mime(struct magic_set *ms, int mime, const char *str)
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{
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if ((mime & MAGIC_MIME_TYPE)) {
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if (file_printf(ms, "inode/%s", str) == -1)
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return -1;
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if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms,
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"; charset=") == -1)
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return -1;
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}
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if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms, "binary") == -1)
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return -1;
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return 0;
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}
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protected int
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file_fsmagic(struct magic_set *ms, const char *fn, struct stat *sb)
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{
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int ret = 0;
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int mime = ms->flags & MAGIC_MIME;
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#ifdef S_IFLNK
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char buf[BUFSIZ+4];
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ssize_t nch;
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struct stat tstatbuf;
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#endif
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if (ms->flags & MAGIC_APPLE)
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return 0;
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if (fn == NULL)
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return 0;
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/*
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* Fstat is cheaper but fails for files you don't have read perms on.
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* On 4.2BSD and similar systems, use lstat() to identify symlinks.
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*/
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#ifdef S_IFLNK
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if ((ms->flags & MAGIC_SYMLINK) == 0)
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ret = lstat(fn, sb);
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else
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#endif
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ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
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if (ret) {
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if (ms->flags & MAGIC_ERROR) {
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file_error(ms, errno, "cannot stat `%s'", fn);
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return -1;
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}
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if (file_printf(ms, "cannot open `%s' (%s)",
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fn, strerror(errno)) == -1)
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return -1;
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ms->event_flags |= EVENT_HAD_ERR;
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return -1;
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}
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if (!mime) {
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#ifdef S_ISUID
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if (sb->st_mode & S_ISUID)
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if (file_printf(ms, "setuid ") == -1)
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return -1;
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#endif
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#ifdef S_ISGID
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if (sb->st_mode & S_ISGID)
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if (file_printf(ms, "setgid ") == -1)
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return -1;
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#endif
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#ifdef S_ISVTX
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if (sb->st_mode & S_ISVTX)
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if (file_printf(ms, "sticky ") == -1)
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return -1;
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#endif
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}
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switch (sb->st_mode & S_IFMT) {
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case S_IFDIR:
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if (mime) {
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if (handle_mime(ms, mime, "directory") == -1)
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return -1;
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} else if (file_printf(ms, "directory") == -1)
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return -1;
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return 1;
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#ifdef S_IFCHR
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case S_IFCHR:
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/*
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* If -s has been specified, treat character special files
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* like ordinary files. Otherwise, just report that they
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* are block special files and go on to the next file.
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*/
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if ((ms->flags & MAGIC_DEVICES) != 0)
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break;
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if (mime) {
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if (handle_mime(ms, mime, "chardevice") == -1)
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return -1;
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} else {
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#ifdef HAVE_STAT_ST_RDEV
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# ifdef dv_unit
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if (file_printf(ms, "character special (%d/%d/%d)",
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major(sb->st_rdev), dv_unit(sb->st_rdev),
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dv_subunit(sb->st_rdev)) == -1)
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return -1;
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# else
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if (file_printf(ms, "character special (%ld/%ld)",
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(long)major(sb->st_rdev), (long)minor(sb->st_rdev))
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== -1)
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return -1;
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# endif
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#else
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if (file_printf(ms, "character special") == -1)
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return -1;
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#endif
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}
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return 1;
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#endif
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#ifdef S_IFBLK
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case S_IFBLK:
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/*
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* If -s has been specified, treat block special files
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* like ordinary files. Otherwise, just report that they
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* are block special files and go on to the next file.
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*/
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if ((ms->flags & MAGIC_DEVICES) != 0)
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break;
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if (mime) {
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if (handle_mime(ms, mime, "blockdevice") == -1)
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return -1;
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} else {
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#ifdef HAVE_STAT_ST_RDEV
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# ifdef dv_unit
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if (file_printf(ms, "block special (%d/%d/%d)",
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major(sb->st_rdev), dv_unit(sb->st_rdev),
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dv_subunit(sb->st_rdev)) == -1)
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return -1;
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# else
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if (file_printf(ms, "block special (%ld/%ld)",
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(long)major(sb->st_rdev), (long)minor(sb->st_rdev)) == -1)
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return -1;
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# endif
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#else
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if (file_printf(ms, "block special") == -1)
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return -1;
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#endif
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}
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return 1;
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#endif
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/* TODO add code to handle V7 MUX and Blit MUX files */
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#ifdef S_IFIFO
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case S_IFIFO:
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if((ms->flags & MAGIC_DEVICES) != 0)
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break;
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if (mime) {
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if (handle_mime(ms, mime, "fifo") == -1)
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return -1;
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} else if (file_printf(ms, "fifo (named pipe)") == -1)
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return -1;
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return 1;
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#endif
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#ifdef S_IFDOOR
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case S_IFDOOR:
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if (mime) {
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if (handle_mime(ms, mime, "door") == -1)
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return -1;
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} else if (file_printf(ms, "door") == -1)
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return -1;
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return 1;
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#endif
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#ifdef S_IFLNK
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case S_IFLNK:
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if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
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if (ms->flags & MAGIC_ERROR) {
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file_error(ms, errno, "unreadable symlink `%s'",
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fn);
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return -1;
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}
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if (mime) {
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if (handle_mime(ms, mime, "symlink") == -1)
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return -1;
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} else if (file_printf(ms,
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"unreadable symlink `%s' (%s)", fn,
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strerror(errno)) == -1)
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return -1;
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return 1;
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}
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buf[nch] = '\0'; /* readlink(2) does not do this */
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/* If broken symlink, say so and quit early. */
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if (*buf == '/') {
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if (stat(buf, &tstatbuf) < 0)
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return bad_link(ms, errno, buf);
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} else {
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char *tmp;
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char buf2[BUFSIZ+BUFSIZ+4];
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if ((tmp = strrchr(fn, '/')) == NULL) {
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tmp = buf; /* in current directory anyway */
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} else {
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if (tmp - fn + 1 > BUFSIZ) {
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if (ms->flags & MAGIC_ERROR) {
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file_error(ms, 0,
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"path too long: `%s'", buf);
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return -1;
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}
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if (mime) {
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if (handle_mime(ms, mime,
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"x-path-too-long") == -1)
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return -1;
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} else if (file_printf(ms,
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"path too long: `%s'", fn) == -1)
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return -1;
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return 1;
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}
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/* take dir part */
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(void)strlcpy(buf2, fn, sizeof buf2);
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buf2[tmp - fn + 1] = '\0';
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/* plus (rel) link */
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(void)strlcat(buf2, buf, sizeof buf2);
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tmp = buf2;
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}
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if (stat(tmp, &tstatbuf) < 0)
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return bad_link(ms, errno, buf);
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}
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/* Otherwise, handle it. */
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if ((ms->flags & MAGIC_SYMLINK) != 0) {
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const char *p;
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ms->flags &= MAGIC_SYMLINK;
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p = magic_file(ms, buf);
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ms->flags |= MAGIC_SYMLINK;
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return p != NULL ? 1 : -1;
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} else { /* just print what it points to */
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if (mime) {
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if (handle_mime(ms, mime, "symlink") == -1)
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return -1;
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} else if (file_printf(ms, "symbolic link to `%s'",
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buf) == -1)
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return -1;
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}
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return 1;
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#endif
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#ifdef S_IFSOCK
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#ifndef __COHERENT__
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case S_IFSOCK:
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if (mime) {
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if (handle_mime(ms, mime, "socket") == -1)
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return -1;
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} else if (file_printf(ms, "socket") == -1)
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return -1;
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return 1;
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#endif
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#endif
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case S_IFREG:
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break;
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default:
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file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
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return -1;
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/*NOTREACHED*/
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}
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/*
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* regular file, check next possibility
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*
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* If stat() tells us the file has zero length, report here that
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* the file is empty, so we can skip all the work of opening and
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* reading the file.
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* But if the -s option has been given, we skip this optimization,
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* since on some systems, stat() reports zero size for raw disk
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* partitions. (If the block special device really has zero length,
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* the fact that it is empty will be detected and reported correctly
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* when we read the file.)
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*/
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if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) {
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if (mime) {
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if (handle_mime(ms, mime, "x-empty") == -1)
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return -1;
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} else if (file_printf(ms, "empty") == -1)
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return -1;
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return 1;
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}
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return 0;
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}
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