mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
247 lines
6.0 KiB
C
247 lines
6.0 KiB
C
/*
|
|
* fsmagic - magic based on filesystem info - directory, special files, etc.
|
|
*
|
|
* Copyright (c) Ian F. Darwin, 1987.
|
|
* Written by Ian F. Darwin.
|
|
*
|
|
* This software is not subject to any license of the American Telephone
|
|
* and Telegraph Company or of the Regents of the University of California.
|
|
*
|
|
* Permission is granted to anyone to use this software for any purpose on
|
|
* any computer system, and to alter it and redistribute it freely, subject
|
|
* to the following restrictions:
|
|
*
|
|
* 1. The author is not responsible for the consequences of use of this
|
|
* software, no matter how awful, even if they arise from flaws in it.
|
|
*
|
|
* 2. The origin of this software must not be misrepresented, either by
|
|
* explicit claim or by omission. Since few users ever read sources,
|
|
* credits must appear in the documentation.
|
|
*
|
|
* 3. Altered versions must be plainly marked as such, and must not be
|
|
* misrepresented as being the original software. Since few users
|
|
* ever read sources, credits must appear in the documentation.
|
|
*
|
|
* 4. This notice may not be removed or altered.
|
|
*/
|
|
|
|
#include "file.h"
|
|
#include <string.h>
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#include <stdlib.h>
|
|
/* Since major is a function on SVR4, we can't 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 1.36 2002/07/03 19:00:41 christos Exp $")
|
|
#endif /* lint */
|
|
|
|
int
|
|
fsmagic(const char *fn, struct stat *sb)
|
|
{
|
|
int ret = 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 (!lflag)
|
|
ret = lstat(fn, sb);
|
|
else
|
|
#endif
|
|
ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
|
|
|
|
if (ret) {
|
|
ckfprintf(stdout,
|
|
/* Yes, I do mean stdout. */
|
|
/* No \n, caller will provide. */
|
|
"can't stat `%s' (%s).", fn, strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
if (iflag) {
|
|
if ((sb->st_mode & S_IFMT) != S_IFREG) {
|
|
ckfputs("application/x-not-regular-file", stdout);
|
|
return 1;
|
|
}
|
|
}
|
|
else {
|
|
#ifdef S_ISUID
|
|
if (sb->st_mode & S_ISUID) ckfputs("setuid ", stdout);
|
|
#endif
|
|
#ifdef S_ISGID
|
|
if (sb->st_mode & S_ISGID) ckfputs("setgid ", stdout);
|
|
#endif
|
|
#ifdef S_ISVTX
|
|
if (sb->st_mode & S_ISVTX) ckfputs("sticky ", stdout);
|
|
#endif
|
|
}
|
|
|
|
switch (sb->st_mode & S_IFMT) {
|
|
case S_IFDIR:
|
|
ckfputs("directory", stdout);
|
|
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 (sflag)
|
|
break;
|
|
#ifdef HAVE_ST_RDEV
|
|
# ifdef dv_unit
|
|
(void) printf("character special (%d/%d/%d)",
|
|
major(sb->st_rdev),
|
|
dv_unit(sb->st_rdev),
|
|
dv_subunit(sb->st_rdev));
|
|
# else
|
|
(void) printf("character special (%ld/%ld)",
|
|
(long) major(sb->st_rdev), (long) minor(sb->st_rdev));
|
|
# endif
|
|
#else
|
|
(void) printf("character special");
|
|
#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 (sflag)
|
|
break;
|
|
#ifdef HAVE_ST_RDEV
|
|
# ifdef dv_unit
|
|
(void) printf("block special (%d/%d/%d)",
|
|
major(sb->st_rdev),
|
|
dv_unit(sb->st_rdev),
|
|
dv_subunit(sb->st_rdev));
|
|
# else
|
|
(void) printf("block special (%ld/%ld)",
|
|
(long) major(sb->st_rdev), (long) minor(sb->st_rdev));
|
|
# endif
|
|
#else
|
|
(void) printf("block special");
|
|
#endif
|
|
return 1;
|
|
#endif
|
|
/* TODO add code to handle V7 MUX and Blit MUX files */
|
|
#ifdef S_IFIFO
|
|
case S_IFIFO:
|
|
ckfputs("fifo (named pipe)", stdout);
|
|
return 1;
|
|
#endif
|
|
#ifdef S_IFDOOR
|
|
case S_IFDOOR:
|
|
ckfputs("door", stdout);
|
|
return 1;
|
|
#endif
|
|
#ifdef S_IFLNK
|
|
case S_IFLNK:
|
|
{
|
|
char buf[BUFSIZ+4];
|
|
int nch;
|
|
struct stat tstatbuf;
|
|
|
|
if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
|
|
ckfprintf(stdout, "unreadable symlink (%s).",
|
|
strerror(errno));
|
|
return 1;
|
|
}
|
|
buf[nch] = '\0'; /* readlink(2) forgets this */
|
|
|
|
/* If broken symlink, say so and quit early. */
|
|
if (*buf == '/') {
|
|
if (stat(buf, &tstatbuf) < 0) {
|
|
ckfprintf(stdout,
|
|
"broken symbolic link to %s", buf);
|
|
return 1;
|
|
}
|
|
}
|
|
else {
|
|
char *tmp;
|
|
char buf2[BUFSIZ+BUFSIZ+4];
|
|
|
|
if ((tmp = strrchr(fn, '/')) == NULL) {
|
|
tmp = buf; /* in current directory anyway */
|
|
}
|
|
else {
|
|
strcpy (buf2, fn); /* take directory part */
|
|
buf2[tmp-fn+1] = '\0';
|
|
strcat (buf2, buf); /* plus (relative) symlink */
|
|
tmp = buf2;
|
|
}
|
|
if (stat(tmp, &tstatbuf) < 0) {
|
|
ckfprintf(stdout,
|
|
"broken symbolic link to %s", buf);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Otherwise, handle it. */
|
|
if (lflag) {
|
|
process(buf, strlen(buf));
|
|
return 1;
|
|
} else { /* just print what it points to */
|
|
ckfputs("symbolic link to ", stdout);
|
|
ckfputs(buf, stdout);
|
|
}
|
|
}
|
|
return 1;
|
|
#endif
|
|
#ifdef S_IFSOCK
|
|
#ifndef __COHERENT__
|
|
case S_IFSOCK:
|
|
ckfputs("socket", stdout);
|
|
return 1;
|
|
#endif
|
|
#endif
|
|
case S_IFREG:
|
|
break;
|
|
default:
|
|
error("invalid mode 0%o.\n", sb->st_mode);
|
|
/*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 (!sflag && sb->st_size == 0) {
|
|
ckfputs(iflag ? "application/x-empty" : "empty", stdout);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|