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