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@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 51typedef 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 60int 61fstyp_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