Home | History | Annotate | Line # | Download | only in fstyp 
      1 /*	$NetBSD: ext2fs.c,v 1.1 2018/01/09 03:31:15 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2017 The NetBSD Foundation, Inc.
      5  * Copyright (c) 2016 The DragonFly Project
      6  * Copyright (c) 2005 Stanislav Sedov
      7  * Copyright (c) 2014 The FreeBSD Foundation
      8  * All rights reserved.
      9  *
     10  * This code is derived from software contributed to The NetBSD Foundation
     11  * by Tomohiro Kusumi <kusumi.tomohiro (at) gmail.com>.
     12  *
     13  * This software was developed by Edward Tomasz Napierala under sponsorship
     14  * from the FreeBSD Foundation.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  */
     37 #include <sys/cdefs.h>
     38 __RCSID("$NetBSD: ext2fs.c,v 1.1 2018/01/09 03:31:15 christos Exp $");
     39 
     40 #include <stdio.h>
     41 #include <stdint.h>
     42 #include <stdlib.h>
     43 #include <string.h>
     44 
     45 #include "fstyp.h"
     46 
     47 #define EXT2FS_SB_OFFSET	1024
     48 #define EXT2_SUPER_MAGIC	0xef53
     49 #define EXT2_DYNAMIC_REV	1
     50 
     51 typedef struct e2sb {
     52 	uint8_t		fake1[56];
     53 	uint16_t	s_magic;
     54 	uint8_t		fake2[18];
     55 	uint32_t	s_rev_level;
     56 	uint8_t		fake3[40];
     57 	char		s_volume_name[16];
     58 } e2sb_t;
     59 
     60 int
     61 fstyp_ext2fs(FILE *fp, char *label, size_t size)
     62 {
     63 	e2sb_t *fs;
     64 	char *s_volume_name;
     65 
     66 	fs = read_buf(fp, EXT2FS_SB_OFFSET, 512);
     67 	if (fs == NULL)
     68 		return 1;
     69 
     70 	/* Check for magic and versio n*/
     71 	if (fs->s_magic == EXT2_SUPER_MAGIC &&
     72 	    fs->s_rev_level == EXT2_DYNAMIC_REV) {
     73 		//G_LABEL_DEBUG(1, "ext2fs file system detected on %s.",
     74 		//    pp->name);
     75 	} else {
     76 		free(fs);
     77 		return 1;
     78 	}
     79 
     80 	s_volume_name = fs->s_volume_name;
     81 	/* Terminate label */
     82 	s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
     83 
     84 	if (s_volume_name[0] == '/')
     85 		s_volume_name += 1;
     86 
     87 	strlcpy(label, s_volume_name, size);
     88 	free(fs);
     89 
     90 	return 0;
     91 }
     92