1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2016 Lennart Poettering
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include "hexdecoct.h"
28 #include "id128-util.h"
30 #include "stdio-util.h"
32 char *id128_to_uuid_string(sd_id128_t id, char s[37]) {
37 /* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */
39 for (n = 0; n < 16; n++) {
41 if (IN_SET(n, 4, 6, 8, 10))
44 s[k++] = hexchar(id.bytes[n] >> 4);
45 s[k++] = hexchar(id.bytes[n] & 0xF);
55 bool id128_is_valid(const char *s) {
63 /* Plain formatted 128bit hex string */
65 for (i = 0; i < l; i++) {
68 if (!(c >= '0' && c <= '9') &&
69 !(c >= 'a' && c <= 'z') &&
70 !(c >= 'A' && c <= 'Z'))
78 for (i = 0; i < l; i++) {
81 if (IN_SET(i, 8, 13, 18, 23)) {
85 if (!(c >= '0' && c <= '9') &&
86 !(c >= 'a' && c <= 'z') &&
87 !(c >= 'A' && c <= 'Z'))
98 int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
103 assert(f < _ID128_FORMAT_MAX);
105 /* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both
106 * optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they
107 * aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you
110 l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */
113 if (l == 0) /* empty? */
118 case 33: /* plain UUID with trailing newline */
119 if (buffer[32] != '\n')
123 case 32: /* plain UUID without trailing newline */
130 case 37: /* RFC UUID with trailing newline */
131 if (buffer[36] != '\n')
135 case 36: /* RFC UUID without trailing newline */
136 if (f == ID128_PLAIN)
146 return sd_id128_from_string(buffer, ret);
149 int id128_read(const char *p, Id128Format f, sd_id128_t *ret) {
150 _cleanup_close_ int fd = -1;
152 fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
156 return id128_read_fd(fd, f, ret);
159 int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) {
165 assert(f < _ID128_FORMAT_MAX);
167 if (f != ID128_UUID) {
168 sd_id128_to_string(id, buffer);
172 id128_to_uuid_string(id, buffer);
177 r = loop_write(fd, buffer, sz, false);
185 r = fsync_directory_of_file(fd);
193 #if 0 /// UNNEEDED by elogind
194 int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) {
195 _cleanup_close_ int fd = -1;
197 fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444);
201 return id128_write_fd(fd, f, id, do_sync);
204 void id128_hash_func(const void *p, struct siphash *state) {
205 siphash24_compress(p, 16, state);
208 int id128_compare_func(const void *a, const void *b) {
209 return memcmp(a, b, 16);
212 const struct hash_ops id128_hash_ops = {
213 .hash = id128_hash_func,
214 .compare = id128_compare_func,