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