1 /*- 2 * Copyright (c) 2015 M. Warner Losh 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/lib/libstand/uuid_from_string.c 300264 2016-05-20 05:33:26Z imp $ 27 */ 28 29 /* 30 * Note: some comments taken from lib/libc/uuid/uuid_from_string.c 31 * Copyright (c) 2002 Marcel Moolenaar 32 * Copyright (c) 2002 Hiten Mahesh Pandya 33 */ 34 35 36 #include <uuid.h> 37 #include "stand.h" 38 39 static int 40 hex2int(int ch) 41 { 42 if (ch >= '0' && ch <= '9') 43 return ch - '0'; 44 if (ch >= 'a' && ch <= 'f') 45 return 10 + ch - 'a'; 46 if (ch >= 'A' && ch <= 'F') 47 return 10 + ch - 'A'; 48 return 16; 49 } 50 51 static uint32_t 52 fromhex(const char *s, int len, int *ok) 53 { 54 uint32_t v; 55 int i, h; 56 57 if (!*ok) 58 return 0; 59 v = 0; 60 for (i = 0; i < len; i++) { 61 h = hex2int(s[i]); 62 if (h == 16) { 63 *ok = 0; 64 return v; 65 } 66 v = (v << 4) | h; 67 } 68 return v; 69 } 70 71 /* 72 * uuid_from_string() - convert a string representation of an UUID into 73 * a binary representation. 74 * See also: 75 * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm 76 * 77 * NOTE: The sequence field is in big-endian, while the time fields are in 78 * native byte order. 79 * 80 * 01234567-89ab-cdef-0123-456789abcdef 81 * 000000000011111111112222222222333333 82 * 012345678901234567890123456789012345 83 * - - - - 84 * hhhhhhhh-hhhh-hhhh-bbbb-bbbbbbbbbbbb 85 * 86 */ 87 void 88 uuid_from_string(const char *s, uuid_t *u, uint32_t *status) 89 { 90 int ok = 1; 91 int n; 92 93 if (s == NULL || *s == '\0') { 94 uuid_create_nil(u, status); 95 return; 96 } 97 98 if (status != NULL) 99 *status = uuid_s_invalid_string_uuid; 100 if (strlen(s) != 36) 101 return; 102 /* Only support new format, check for all the right dashes */ 103 if (s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-') 104 return; 105 /* native byte order */ 106 u->time_low = fromhex(s , 8, &ok); 107 u->time_mid = fromhex(s + 9, 4, &ok); 108 u->time_hi_and_version = fromhex(s + 14, 4, &ok); 109 /* Big endian, but presented as a whole number so decode as such */ 110 u->clock_seq_hi_and_reserved = fromhex(s + 19, 2, &ok); 111 u->clock_seq_low = fromhex(s + 21, 2, &ok); 112 u->node[0] = fromhex(s + 24, 2, &ok); 113 u->node[1] = fromhex(s + 26, 2, &ok); 114 u->node[2] = fromhex(s + 28, 2, &ok); 115 u->node[3] = fromhex(s + 30, 2, &ok); 116 u->node[4] = fromhex(s + 32, 2, &ok); 117 u->node[5] = fromhex(s + 34, 2, &ok); 118 if (!ok) 119 return; 120 121 /* We have a successful scan. Check semantics... */ 122 n = u->clock_seq_hi_and_reserved; 123 if ((n & 0x80) != 0x00 && /* variant 0? */ 124 (n & 0xc0) != 0x80 && /* variant 1? */ 125 (n & 0xe0) != 0xc0) { /* variant 2? */ 126 if (status != NULL) 127 *status = uuid_s_bad_version; 128 } else { 129 if (status != NULL) 130 *status = uuid_s_ok; 131 } 132 } 133