1 /* $NetBSD: gpt_uuid.c,v 1.13 2015/12/06 00:39:26 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #if HAVE_NBTOOL_CONFIG_H 30 #include "nbtool_config.h" 31 #endif 32 33 #include <sys/cdefs.h> 34 #ifdef __RCSID 35 __RCSID("$NetBSD: gpt_uuid.c,v 1.13 2015/12/06 00:39:26 christos Exp $"); 36 #endif 37 38 #include <err.h> 39 #include <fcntl.h> 40 #include <stdio.h> 41 #include <unistd.h> 42 43 #include "map.h" 44 #include "gpt.h" 45 46 #if defined(HAVE_SYS_ENDIAN_H) || ! defined(HAVE_NBTOOL_CONFIG_H) 47 #include <sys/endian.h> 48 #endif 49 50 51 const gpt_uuid_t gpt_uuid_nil; 52 53 struct dce_uuid { 54 uint32_t time_low; 55 uint16_t time_mid; 56 uint16_t time_hi_and_version; 57 uint8_t clock_seq_hi_and_reserved; 58 uint8_t clock_seq_low; 59 uint8_t node[6]; 60 }; 61 62 static const struct { 63 struct dce_uuid u; 64 const char *n; 65 const char *d; 66 } gpt_nv[] = { 67 { GPT_ENT_TYPE_APPLE_HFS, "apple", "Apple HFS" }, 68 { GPT_ENT_TYPE_APPLE_UFS, "apple-ufs", "Apple UFS" }, 69 { GPT_ENT_TYPE_BIOS, "bios", "BIOS Boot" }, 70 { GPT_ENT_TYPE_EFI, "efi", "EFI System" }, 71 { GPT_ENT_TYPE_FREEBSD, "fbsd-legacy", "FreeBSD legacy" }, 72 { GPT_ENT_TYPE_FREEBSD_SWAP, "fbsd-swap", "FreeBSD swap" }, 73 { GPT_ENT_TYPE_FREEBSD_UFS, "fbsd-ufs", "FreeBSD UFS/UFS2" }, 74 { GPT_ENT_TYPE_FREEBSD_VINUM, "fbsd-vinum", "FreeBSD vinum" }, 75 { GPT_ENT_TYPE_FREEBSD_ZFS, "fbsd-zfs", "FreeBSD ZFS" }, 76 { GPT_ENT_TYPE_LINUX_DATA, "linux-data", "Linux data" }, 77 { GPT_ENT_TYPE_LINUX_RAID, "linux-raid", "Linux RAID" }, 78 { GPT_ENT_TYPE_LINUX_SWAP, "linux-swap", "Linux swap" }, 79 { GPT_ENT_TYPE_LINUX_LVM, "linux-lvm", "Linux LVM" }, 80 { GPT_ENT_TYPE_MS_BASIC_DATA, "windows", "Windows basic data" }, 81 { GPT_ENT_TYPE_MS_RESERVED, "windows-reserved", "Windows reserved" }, 82 { GPT_ENT_TYPE_NETBSD_CCD, "ccd", "NetBSD ccd component" }, 83 { GPT_ENT_TYPE_NETBSD_CGD, "cgd", "NetBSD Cryptographic Disk" }, 84 { GPT_ENT_TYPE_NETBSD_FFS, "ffs", "NetBSD FFSv1/FFSv2" }, 85 { GPT_ENT_TYPE_NETBSD_LFS, "lfs", "NetBSD LFS" }, 86 { GPT_ENT_TYPE_NETBSD_RAIDFRAME, "raid", 87 "NetBSD RAIDFrame component" }, 88 { GPT_ENT_TYPE_NETBSD_SWAP, "swap", "NetBSD swap" }, 89 }; 90 91 static void 92 gpt_uuid_to_dce(const gpt_uuid_t buf, struct dce_uuid *uuid) 93 { 94 const uint8_t *p = buf; 95 size_t i; 96 97 uuid->time_low = le32dec(p); 98 uuid->time_mid = le16dec(p + 4); 99 uuid->time_hi_and_version = le16dec(p + 6); 100 uuid->clock_seq_hi_and_reserved = p[8]; 101 uuid->clock_seq_low = p[9]; 102 for (i = 0; i < sizeof(uuid->node); i++) 103 uuid->node[i] = p[10 + i]; 104 } 105 106 static void 107 gpt_dce_to_uuid(const struct dce_uuid *uuid, uint8_t *buf) 108 { 109 uint8_t *p = buf; 110 size_t i; 111 112 le32enc(p, uuid->time_low); 113 le16enc(p + 4, uuid->time_mid); 114 le16enc(p + 6, uuid->time_hi_and_version); 115 p[8] = uuid->clock_seq_hi_and_reserved; 116 p[9] = uuid->clock_seq_low; 117 for (i = 0; i < sizeof(uuid->node); i++) 118 p[10 + i] = uuid->node[i]; 119 } 120 121 static int 122 gpt_uuid_numeric(char *buf, size_t bufsiz, const struct dce_uuid *u) 123 { 124 return snprintf(buf, bufsiz, 125 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 126 u->time_low, u->time_mid, u->time_hi_and_version, 127 u->clock_seq_hi_and_reserved, u->clock_seq_low, u->node[0], 128 u->node[1], u->node[2], u->node[3], u->node[4], u->node[5]); 129 } 130 131 132 static int 133 gpt_uuid_symbolic(char *buf, size_t bufsiz, const struct dce_uuid *u) 134 { 135 size_t i; 136 137 for (i = 0; i < __arraycount(gpt_nv); i++) 138 if (memcmp(&gpt_nv[i].u, u, sizeof(*u)) == 0) 139 return (int)strlcpy(buf, gpt_nv[i].n, bufsiz); 140 return -1; 141 } 142 143 static int 144 gpt_uuid_descriptive(char *buf, size_t bufsiz, const struct dce_uuid *u) 145 { 146 size_t i; 147 148 for (i = 0; i < __arraycount(gpt_nv); i++) 149 if (memcmp(&gpt_nv[i].u, u, sizeof(*u)) == 0) 150 return (int)strlcpy(buf, gpt_nv[i].d, bufsiz); 151 return -1; 152 } 153 154 int 155 gpt_uuid_snprintf(char *buf, size_t bufsiz, const char *fmt, 156 const gpt_uuid_t uu) 157 { 158 struct dce_uuid u; 159 gpt_uuid_to_dce(uu, &u); 160 161 if (fmt[1] == 's') { 162 int r; 163 if ((r = gpt_uuid_symbolic(buf, bufsiz, &u)) != -1) 164 return r; 165 } 166 if (fmt[1] == 'l') { 167 int r; 168 if ((r = gpt_uuid_descriptive(buf, bufsiz, &u)) != -1) 169 return r; 170 } 171 return gpt_uuid_numeric(buf, bufsiz, &u); 172 } 173 174 static int 175 gpt_uuid_parse_numeric(const char *s, struct dce_uuid *u) 176 { 177 int n; 178 179 if (s == NULL || *s == '\0') { 180 memset(u, 0, sizeof(*u)); 181 return 0; 182 } 183 184 n = sscanf(s, 185 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx", 186 &u->time_low, &u->time_mid, &u->time_hi_and_version, 187 &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0], 188 &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]); 189 190 /* Make sure we have all conversions. */ 191 if (n != 11) 192 return -1; 193 194 /* We have a successful scan. Check semantics... */ 195 n = u->clock_seq_hi_and_reserved; 196 if ((n & 0x80) != 0x00 && /* variant 0? */ 197 (n & 0xc0) != 0x80 && /* variant 1? */ 198 (n & 0xe0) != 0xc0) /* variant 2? */ 199 return -1; 200 return 0; 201 } 202 203 static int 204 gpt_uuid_parse_symbolic(const char *s, struct dce_uuid *u) 205 { 206 size_t i; 207 208 for (i = 0; i < __arraycount(gpt_nv); i++) 209 if (strcmp(gpt_nv[i].n, s) == 0) { 210 *u = gpt_nv[i].u; 211 return 0; 212 } 213 return -1; 214 } 215 216 int 217 gpt_uuid_parse(const char *s, gpt_uuid_t uuid) 218 { 219 struct dce_uuid u; 220 221 if (gpt_uuid_parse_numeric(s, &u) != -1) { 222 gpt_dce_to_uuid(&u, uuid); 223 return 0; 224 } 225 226 if (gpt_uuid_parse_symbolic(s, &u) == -1) 227 return -1; 228 229 gpt_dce_to_uuid(&u, uuid); 230 return 0; 231 } 232 233 void 234 gpt_uuid_help(const char *prefix) 235 { 236 size_t i; 237 238 for (i = 0; i < __arraycount(gpt_nv); i++) 239 printf("%s%18.18s\t%s\n", prefix, gpt_nv[i].n, gpt_nv[i].d); 240 } 241 242 void 243 gpt_uuid_create(gpt_type_t t, gpt_uuid_t u, uint16_t *b, size_t s) 244 { 245 gpt_dce_to_uuid(&gpt_nv[t].u, u); 246 if (b) 247 utf8_to_utf16((const uint8_t *)gpt_nv[t].d, b, s / sizeof(*b)); 248 } 249 250 int 251 gpt_uuid_generate(gpt_t gpt, gpt_uuid_t t) 252 { 253 struct dce_uuid u; 254 int fd; 255 uint8_t *p; 256 size_t n; 257 ssize_t nread; 258 259 /* Randomly generate the content. */ 260 fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC); 261 if (fd == -1) { 262 gpt_warn(gpt, "Can't open `/dev/urandom'"); 263 return -1; 264 } 265 for (p = (void *)&u, n = sizeof u; n > 0; p += nread, n -= (size_t)nread) { 266 nread = read(fd, p, n); 267 if (nread < 0) { 268 gpt_warn(gpt, "Can't read `/dev/urandom'"); 269 goto out; 270 } 271 if (nread == 0) { 272 gpt_warn(gpt, "EOF from /dev/urandom"); 273 goto out; 274 } 275 if ((size_t)nread > n) { 276 gpt_warnx(gpt, "read too much: %zd > %zu", nread, n); 277 goto out; 278 } 279 } 280 (void)close(fd); 281 282 /* Set the version number to 4. */ 283 u.time_hi_and_version &= (uint16_t)~0xf000; 284 u.time_hi_and_version |= 0x4000; 285 286 /* Fix the reserved bits. */ 287 u.clock_seq_hi_and_reserved &= (uint8_t)~0x40; 288 u.clock_seq_hi_and_reserved |= 0x80; 289 290 gpt_dce_to_uuid(&u, t); 291 close(fd); 292 return 0; 293 out: 294 return -1; 295 } 296