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/>.
25 #include "hexdecoct.h"
26 #include "id128-util.h"
28 #include "stdio-util.h"
30 char *id128_to_uuid_string(sd_id128_t id, char s[37]) {
35 /* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */
37 for (n = 0; n < 16; n++) {
39 if (IN_SET(n, 4, 6, 8, 10))
42 s[k++] = hexchar(id.bytes[n] >> 4);
43 s[k++] = hexchar(id.bytes[n] & 0xF);
53 bool id128_is_valid(const char *s) {
61 /* Plain formatted 128bit hex string */
63 for (i = 0; i < l; i++) {
66 if (!(c >= '0' && c <= '9') &&
67 !(c >= 'a' && c <= 'z') &&
68 !(c >= 'A' && c <= 'Z'))
76 for (i = 0; i < l; i++) {
79 if (IN_SET(i, 8, 13, 18, 23)) {
83 if (!(c >= '0' && c <= '9') &&
84 !(c >= 'a' && c <= 'z') &&
85 !(c >= 'A' && c <= 'Z'))
96 int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
101 assert(f < _ID128_FORMAT_MAX);
103 /* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both
104 * optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they
105 * aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you
108 l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */
111 if (l == 0) /* empty? */
116 case 33: /* plain UUID with trailing newline */
117 if (buffer[32] != '\n')
121 case 32: /* plain UUID without trailing newline */
128 case 37: /* RFC UUID with trailing newline */
129 if (buffer[36] != '\n')
133 case 36: /* RFC UUID without trailing newline */
134 if (f == ID128_PLAIN)
144 return sd_id128_from_string(buffer, ret);
147 int id128_read(const char *p, Id128Format f, sd_id128_t *ret) {
148 _cleanup_close_ int fd = -1;
150 fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
154 return id128_read_fd(fd, f, ret);
157 int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) {
163 assert(f < _ID128_FORMAT_MAX);
165 if (f != ID128_UUID) {
166 sd_id128_to_string(id, buffer);
170 id128_to_uuid_string(id, buffer);
175 r = loop_write(fd, buffer, sz, false);
187 #if 0 /// UNNEEDED by elogind
188 int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) {
189 _cleanup_close_ int fd = -1;
191 fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444);
195 return id128_write_fd(fd, f, id, do_sync);
198 void id128_hash_func(const void *p, struct siphash *state) {
199 siphash24_compress(p, 16, state);
202 int id128_compare_func(const void *a, const void *b) {
203 return memcmp(a, b, 16);
206 const struct hash_ops id128_hash_ops = {
207 .hash = id128_hash_func,
208 .compare = id128_compare_func,