1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Takanori Watanabe 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 37 #include <geom/geom.h> 38 #include <geom/label/g_label.h> 39 40 #define NTFS_A_VOLUMENAME 0x60 41 #define NTFS_FILEMAGIC ((uint32_t)(0x454C4946)) 42 #define NTFS_VOLUMEINO 3 43 44 struct ntfs_attr { 45 uint32_t a_type; 46 uint32_t reclen; 47 uint8_t a_flag; 48 uint8_t a_namelen; 49 uint8_t a_nameoff; 50 uint8_t reserved1; 51 uint8_t a_compression; 52 uint8_t reserved2; 53 uint16_t a_index; 54 uint16_t a_datalen; 55 uint16_t reserved3; 56 uint16_t a_dataoff; 57 uint16_t a_indexed; 58 } __packed; 59 60 struct ntfs_filerec { 61 uint32_t fr_hdrmagic; 62 uint16_t fr_hdrfoff; 63 uint16_t fr_hdrfnum; 64 uint8_t reserved[8]; 65 uint16_t fr_seqnum; 66 uint16_t fr_nlink; 67 uint16_t fr_attroff; 68 uint16_t fr_flags; 69 uint32_t fr_size; 70 uint32_t fr_allocated; 71 uint64_t fr_mainrec; 72 uint16_t fr_attrnum; 73 } __packed; 74 75 struct ntfs_bootfile { 76 uint8_t reserved1[3]; 77 uint8_t bf_sysid[8]; 78 uint16_t bf_bps; 79 uint8_t bf_spc; 80 uint8_t reserved2[7]; 81 uint8_t bf_media; 82 uint8_t reserved3[2]; 83 uint16_t bf_spt; 84 uint16_t bf_heads; 85 uint8_t reserver4[12]; 86 uint64_t bf_spv; 87 uint64_t bf_mftcn; 88 uint64_t bf_mftmirrcn; 89 int8_t bf_mftrecsz; 90 uint32_t bf_ibsz; 91 uint32_t bf_volsn; 92 } __packed; 93 94 static void 95 g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size) 96 { 97 struct g_provider *pp; 98 struct ntfs_bootfile *bf; 99 struct ntfs_filerec *fr; 100 struct ntfs_attr *atr; 101 off_t voloff; 102 char *filerecp, *ap; 103 int8_t mftrecsz; 104 char vnchar; 105 int recsize, j; 106 107 g_topology_assert_not(); 108 109 label[0] = '\0'; 110 pp = cp->provider; 111 bf = NULL; 112 filerecp = NULL; 113 114 if (pp->sectorsize < sizeof(*bf)) 115 goto done; 116 117 bf = g_read_data(cp, 0, pp->sectorsize, NULL); 118 if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0) 119 goto done; 120 121 mftrecsz = bf->bf_mftrecsz; 122 recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz); 123 if (recsize == 0 || recsize % pp->sectorsize != 0) 124 goto done; 125 126 voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps + 127 recsize * NTFS_VOLUMEINO; 128 if (voloff % pp->sectorsize != 0) 129 goto done; 130 131 filerecp = g_read_data(cp, voloff, recsize, NULL); 132 if (filerecp == NULL) 133 goto done; 134 fr = (struct ntfs_filerec *)filerecp; 135 136 if (fr->fr_hdrmagic != NTFS_FILEMAGIC) 137 goto done; 138 139 for (ap = filerecp + fr->fr_attroff; 140 atr = (struct ntfs_attr *)ap, atr->a_type != -1; 141 ap += atr->reclen) { 142 if (atr->a_type == NTFS_A_VOLUMENAME) { 143 if(atr->a_datalen >= size *2){ 144 label[0] = 0; 145 goto done; 146 } 147 /* 148 *UNICODE to ASCII. 149 * Should we need to use iconv(9)? 150 */ 151 for (j = 0; j < atr->a_datalen; j++) { 152 vnchar = *(ap + atr->a_dataoff + j); 153 if (j & 1) { 154 if (vnchar) { 155 label[0] = 0; 156 goto done; 157 } 158 } else { 159 label[j / 2] = vnchar; 160 } 161 } 162 label[j / 2] = 0; 163 break; 164 } 165 } 166 done: 167 if (bf != NULL) 168 g_free(bf); 169 if (filerecp != NULL) 170 g_free(filerecp); 171 } 172 173 struct g_label_desc g_label_ntfs = { 174 .ld_taste = g_label_ntfs_taste, 175 .ld_dirprefix = "ntfs/", 176 .ld_enabled = 1 177 }; 178 179 G_LABEL_INIT(ntfs, g_label_ntfs, "Create device nodes for NTFS volumes"); 180