1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/malloc.h> 33 34 #include <geom/geom.h> 35 #include <geom/label/g_label.h> 36 37 #define NTFS_A_VOLUMENAME 0x60 38 #define NTFS_FILEMAGIC ((uint32_t)(0x454C4946)) 39 #define NTFS_VOLUMEINO 3 40 41 struct ntfs_attr { 42 uint32_t a_type; 43 uint32_t reclen; 44 uint8_t a_flag; 45 uint8_t a_namelen; 46 uint8_t a_nameoff; 47 uint8_t reserved1; 48 uint8_t a_compression; 49 uint8_t reserved2; 50 uint16_t a_index; 51 uint16_t a_datalen; 52 uint16_t reserved3; 53 uint16_t a_dataoff; 54 uint16_t a_indexed; 55 } __packed; 56 57 struct ntfs_filerec { 58 uint32_t fr_hdrmagic; 59 uint16_t fr_hdrfoff; 60 uint16_t fr_hdrfnum; 61 uint8_t reserved[8]; 62 uint16_t fr_seqnum; 63 uint16_t fr_nlink; 64 uint16_t fr_attroff; 65 uint16_t fr_flags; 66 uint32_t fr_size; 67 uint32_t fr_allocated; 68 uint64_t fr_mainrec; 69 uint16_t fr_attrnum; 70 } __packed; 71 72 struct ntfs_bootfile { 73 uint8_t reserved1[3]; 74 uint8_t bf_sysid[8]; 75 uint16_t bf_bps; 76 uint8_t bf_spc; 77 uint8_t reserved2[7]; 78 uint8_t bf_media; 79 uint8_t reserved3[2]; 80 uint16_t bf_spt; 81 uint16_t bf_heads; 82 uint8_t reserver4[12]; 83 uint64_t bf_spv; 84 uint64_t bf_mftcn; 85 uint64_t bf_mftmirrcn; 86 int8_t bf_mftrecsz; 87 uint32_t bf_ibsz; 88 uint32_t bf_volsn; 89 } __packed; 90 91 static void 92 g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size) 93 { 94 struct g_provider *pp; 95 struct ntfs_bootfile *bf; 96 struct ntfs_filerec *fr; 97 struct ntfs_attr *atr; 98 off_t voloff; 99 size_t recoff; 100 char *filerecp; 101 int8_t mftrecsz; 102 char vnchar; 103 int recsize, j; 104 105 g_topology_assert_not(); 106 107 label[0] = '\0'; 108 pp = cp->provider; 109 bf = NULL; 110 filerecp = NULL; 111 112 if (pp->sectorsize < sizeof(*bf)) 113 goto done; 114 115 bf = g_read_data(cp, 0, pp->sectorsize, NULL); 116 if (bf == NULL || strncmp(bf->bf_sysid, "NTFS ", 8) != 0) 117 goto done; 118 119 mftrecsz = bf->bf_mftrecsz; 120 recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : 121 (1 << -mftrecsz); 122 if (recsize <= 0 || recsize > maxphys || recsize % pp->sectorsize != 0) 123 goto done; 124 125 voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps + 126 recsize * NTFS_VOLUMEINO; 127 if (voloff % pp->sectorsize != 0) 128 goto done; 129 130 filerecp = g_read_data(cp, voloff, recsize, NULL); 131 if (filerecp == NULL) 132 goto done; 133 fr = (struct ntfs_filerec *)filerecp; 134 if (fr->fr_hdrmagic != NTFS_FILEMAGIC) 135 goto done; 136 137 for (recoff = fr->fr_attroff; 138 recoff <= recsize - 2 * sizeof(uint32_t); 139 recoff += atr->reclen) { 140 atr = (struct ntfs_attr *)(filerecp + recoff); 141 if (atr->a_type == -1) 142 break; 143 if (atr->reclen < sizeof(*atr)) 144 break; 145 if (recsize - recoff < atr->reclen) 146 break; 147 if (atr->a_type == NTFS_A_VOLUMENAME) { 148 if (atr->a_dataoff > atr->reclen || 149 atr->a_datalen > atr->reclen - atr->a_dataoff) 150 break; 151 152 /* 153 * UNICODE to ASCII. 154 * Should we need to use iconv(9)? 155 */ 156 if (atr->a_datalen >= size * 2 || 157 atr->a_datalen % 2 != 0) 158 break; 159 for (j = 0; j < atr->a_datalen; j++) { 160 vnchar = ((char *)atr)[atr->a_dataoff + j]; 161 if (j & 1) { 162 if (vnchar) { 163 label[0] = 0; 164 goto done; 165 } 166 } else { 167 label[j / 2] = vnchar; 168 } 169 } 170 label[j / 2] = 0; 171 break; 172 } 173 } 174 done: 175 g_free(bf); 176 g_free(filerecp); 177 } 178 179 struct g_label_desc g_label_ntfs = { 180 .ld_taste = g_label_ntfs_taste, 181 .ld_dirprefix = "ntfs/", 182 .ld_enabled = 1 183 }; 184 185 G_LABEL_INIT(ntfs, g_label_ntfs, "Create device nodes for NTFS volumes"); 186