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87d2c1ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
87d2c1ff LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
87d2c1ff | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
87d2c1ff LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
24 | #include <unistd.h> | |
25 | ||
87d2c1ff LP |
26 | #include "util.h" |
27 | #include "macro.h" | |
80514f9c | 28 | #include "sd-id128.h" |
87d2c1ff | 29 | |
000a2c98 | 30 | _public_ char *sd_id128_to_string(sd_id128_t id, char s[33]) { |
87d2c1ff LP |
31 | unsigned n; |
32 | ||
1ae464e0 | 33 | assert_return(s, NULL); |
87d2c1ff LP |
34 | |
35 | for (n = 0; n < 16; n++) { | |
36 | s[n*2] = hexchar(id.bytes[n] >> 4); | |
37 | s[n*2+1] = hexchar(id.bytes[n] & 0xF); | |
38 | } | |
39 | ||
40 | s[32] = 0; | |
41 | ||
42 | return s; | |
43 | } | |
44 | ||
aa96c6cb LP |
45 | _public_ int sd_id128_from_string(const char s[], sd_id128_t *ret) { |
46 | unsigned n, i; | |
87d2c1ff | 47 | sd_id128_t t; |
aa96c6cb | 48 | bool is_guid = false; |
87d2c1ff | 49 | |
1ae464e0 TA |
50 | assert_return(s, -EINVAL); |
51 | assert_return(ret, -EINVAL); | |
87d2c1ff | 52 | |
aa96c6cb | 53 | for (n = 0, i = 0; n < 16;) { |
87d2c1ff LP |
54 | int a, b; |
55 | ||
aa96c6cb LP |
56 | if (s[i] == '-') { |
57 | /* Is this a GUID? Then be nice, and skip over | |
58 | * the dashes */ | |
59 | ||
60 | if (i == 8) | |
61 | is_guid = true; | |
62 | else if (i == 13 || i == 18 || i == 23) { | |
63 | if (!is_guid) | |
64 | return -EINVAL; | |
65 | } else | |
66 | return -EINVAL; | |
67 | ||
68 | i++; | |
69 | continue; | |
70 | } | |
71 | ||
72 | a = unhexchar(s[i++]); | |
87d2c1ff LP |
73 | if (a < 0) |
74 | return -EINVAL; | |
75 | ||
aa96c6cb | 76 | b = unhexchar(s[i++]); |
87d2c1ff LP |
77 | if (b < 0) |
78 | return -EINVAL; | |
79 | ||
aa96c6cb | 80 | t.bytes[n++] = (a << 4) | b; |
87d2c1ff LP |
81 | } |
82 | ||
aa96c6cb LP |
83 | if (i != (is_guid ? 36 : 32)) |
84 | return -EINVAL; | |
85 | ||
86 | if (s[i] != 0) | |
87d2c1ff LP |
87 | return -EINVAL; |
88 | ||
89 | *ret = t; | |
90 | return 0; | |
91 | } | |
92 | ||
e4bac488 | 93 | static sd_id128_t make_v4_uuid(sd_id128_t id) { |
87d2c1ff LP |
94 | /* Stolen from generate_random_uuid() of drivers/char/random.c |
95 | * in the kernel sources */ | |
96 | ||
97 | /* Set UUID version to 4 --- truly random generation */ | |
98 | id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40; | |
99 | ||
100 | /* Set the UUID variant to DCE */ | |
101 | id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80; | |
102 | ||
103 | return id; | |
104 | } | |
105 | ||
000a2c98 | 106 | _public_ int sd_id128_get_machine(sd_id128_t *ret) { |
ec202eae SL |
107 | static thread_local sd_id128_t saved_machine_id; |
108 | static thread_local bool saved_machine_id_valid = false; | |
aa96c6cb LP |
109 | _cleanup_close_ int fd = -1; |
110 | char buf[33]; | |
87d2c1ff LP |
111 | ssize_t k; |
112 | unsigned j; | |
113 | sd_id128_t t; | |
114 | ||
1ae464e0 | 115 | assert_return(ret, -EINVAL); |
000a2c98 | 116 | |
87d2c1ff LP |
117 | if (saved_machine_id_valid) { |
118 | *ret = saved_machine_id; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
123 | if (fd < 0) | |
124 | return -errno; | |
125 | ||
aa96c6cb | 126 | k = loop_read(fd, buf, 33, false); |
87d2c1ff LP |
127 | if (k < 0) |
128 | return (int) k; | |
129 | ||
aa96c6cb LP |
130 | if (k != 33) |
131 | return -EIO; | |
132 | ||
133 | if (buf[32] !='\n') | |
87d2c1ff LP |
134 | return -EIO; |
135 | ||
136 | for (j = 0; j < 16; j++) { | |
137 | int a, b; | |
138 | ||
139 | a = unhexchar(buf[j*2]); | |
140 | b = unhexchar(buf[j*2+1]); | |
141 | ||
142 | if (a < 0 || b < 0) | |
143 | return -EIO; | |
144 | ||
145 | t.bytes[j] = a << 4 | b; | |
146 | } | |
147 | ||
148 | saved_machine_id = t; | |
149 | saved_machine_id_valid = true; | |
150 | ||
151 | *ret = t; | |
152 | return 0; | |
153 | } | |
154 | ||
000a2c98 | 155 | _public_ int sd_id128_get_boot(sd_id128_t *ret) { |
ec202eae SL |
156 | static thread_local sd_id128_t saved_boot_id; |
157 | static thread_local bool saved_boot_id_valid = false; | |
aa96c6cb | 158 | _cleanup_close_ int fd = -1; |
87d2c1ff LP |
159 | char buf[36]; |
160 | ssize_t k; | |
161 | unsigned j; | |
162 | sd_id128_t t; | |
163 | char *p; | |
164 | ||
1ae464e0 | 165 | assert_return(ret, -EINVAL); |
000a2c98 | 166 | |
87d2c1ff LP |
167 | if (saved_boot_id_valid) { |
168 | *ret = saved_boot_id; | |
169 | return 0; | |
170 | } | |
171 | ||
172 | fd = open("/proc/sys/kernel/random/boot_id", O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
173 | if (fd < 0) | |
174 | return -errno; | |
175 | ||
176 | k = loop_read(fd, buf, 36, false); | |
87d2c1ff LP |
177 | if (k < 0) |
178 | return (int) k; | |
179 | ||
aa96c6cb | 180 | if (k != 36) |
87d2c1ff LP |
181 | return -EIO; |
182 | ||
183 | for (j = 0, p = buf; j < 16; j++) { | |
184 | int a, b; | |
185 | ||
cef35669 | 186 | if (p >= buf + k - 1) |
54c7d1f4 ZJS |
187 | return -EIO; |
188 | ||
cef35669 | 189 | if (*p == '-') { |
87d2c1ff | 190 | p++; |
cef35669 ZJS |
191 | if (p >= buf + k - 1) |
192 | return -EIO; | |
193 | } | |
87d2c1ff LP |
194 | |
195 | a = unhexchar(p[0]); | |
196 | b = unhexchar(p[1]); | |
197 | ||
198 | if (a < 0 || b < 0) | |
199 | return -EIO; | |
200 | ||
201 | t.bytes[j] = a << 4 | b; | |
202 | ||
203 | p += 2; | |
204 | } | |
205 | ||
206 | saved_boot_id = t; | |
207 | saved_boot_id_valid = true; | |
208 | ||
209 | *ret = t; | |
210 | return 0; | |
211 | } | |
212 | ||
000a2c98 | 213 | _public_ int sd_id128_randomize(sd_id128_t *ret) { |
87d2c1ff | 214 | sd_id128_t t; |
0f0e240c | 215 | int r; |
87d2c1ff | 216 | |
1ae464e0 | 217 | assert_return(ret, -EINVAL); |
87d2c1ff | 218 | |
0f0e240c LP |
219 | r = dev_urandom(&t, sizeof(t)); |
220 | if (r < 0) | |
221 | return r; | |
87d2c1ff LP |
222 | |
223 | /* Turn this into a valid v4 UUID, to be nice. Note that we | |
224 | * only guarantee this for newly generated UUIDs, not for | |
225 | * pre-existing ones.*/ | |
226 | ||
e4bac488 | 227 | *ret = make_v4_uuid(t); |
87d2c1ff LP |
228 | return 0; |
229 | } |