2 This file is part of systemd.
4 Copyright 2016 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include "hexdecoct.h"
25 #include "id128-util.h"
27 #include "stdio-util.h"
29 char *id128_to_uuid_string(sd_id128_t id, char s[37]) {
34 /* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */
36 for (n = 0; n < 16; n++) {
38 if (IN_SET(n, 4, 6, 8, 10))
41 s[k++] = hexchar(id.bytes[n] >> 4);
42 s[k++] = hexchar(id.bytes[n] & 0xF);
52 bool id128_is_valid(const char *s) {
60 /* Plain formatted 128bit hex string */
62 for (i = 0; i < l; i++) {
65 if (!(c >= '0' && c <= '9') &&
66 !(c >= 'a' && c <= 'z') &&
67 !(c >= 'A' && c <= 'Z'))
75 for (i = 0; i < l; i++) {
78 if ((i == 8 || i == 13 || i == 18 || i == 23)) {
82 if (!(c >= '0' && c <= '9') &&
83 !(c >= 'a' && c <= 'z') &&
84 !(c >= 'A' && c <= 'Z'))
95 int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
100 assert(f < _ID128_FORMAT_MAX);
102 /* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both
103 * optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they
104 * aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you
107 l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */
110 if (l == 0) /* empty? */
115 case 33: /* plain UUID with trailing newline */
116 if (buffer[32] != '\n')
120 case 32: /* plain UUID without trailing newline */
127 case 37: /* RFC UUID with trailing newline */
128 if (buffer[36] != '\n')
132 case 36: /* RFC UUID without trailing newline */
133 if (f == ID128_PLAIN)
143 return sd_id128_from_string(buffer, ret);
146 int id128_read(const char *p, Id128Format f, sd_id128_t *ret) {
147 _cleanup_close_ int fd = -1;
149 fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
153 return id128_read_fd(fd, f, ret);
156 int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) {
162 assert(f < _ID128_FORMAT_MAX);
164 if (f != ID128_UUID) {
165 sd_id128_to_string(id, buffer);
169 id128_to_uuid_string(id, buffer);
174 r = loop_write(fd, buffer, sz, false);
186 int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) {
187 _cleanup_close_ int fd = -1;
189 fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
193 return id128_write_fd(fd, f, id, do_sync);
196 void id128_hash_func(const void *p, struct siphash *state) {
197 siphash24_compress(p, 16, state);
200 int id128_compare_func(const void *a, const void *b) {
201 return memcmp(a, b, 16);
204 const struct hash_ops id128_hash_ops = {
205 .hash = id128_hash_func,
206 .compare = id128_compare_func,