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