+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2011 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <fcntl.h>
-#include <unistd.h>
-
-#include "util.h"
-#include "macro.h"
-#include "sd-id128.h"
-
-_public_ char *sd_id128_to_string(sd_id128_t id, char s[33]) {
- unsigned n;
-
- assert_return(s, NULL);
-
- for (n = 0; n < 16; n++) {
- s[n*2] = hexchar(id.bytes[n] >> 4);
- s[n*2+1] = hexchar(id.bytes[n] & 0xF);
- }
-
- s[32] = 0;
-
- return s;
-}
-
-_public_ int sd_id128_from_string(const char s[], sd_id128_t *ret) {
- unsigned n, i;
- sd_id128_t t;
- bool is_guid = false;
-
- assert_return(s, -EINVAL);
- assert_return(ret, -EINVAL);
-
- for (n = 0, i = 0; n < 16;) {
- int a, b;
-
- if (s[i] == '-') {
- /* Is this a GUID? Then be nice, and skip over
- * the dashes */
-
- if (i == 8)
- is_guid = true;
- else if (i == 13 || i == 18 || i == 23) {
- if (!is_guid)
- return -EINVAL;
- } else
- return -EINVAL;
-
- i++;
- continue;
- }
-
- a = unhexchar(s[i++]);
- if (a < 0)
- return -EINVAL;
-
- b = unhexchar(s[i++]);
- if (b < 0)
- return -EINVAL;
-
- t.bytes[n++] = (a << 4) | b;
- }
-
- if (i != (is_guid ? 36 : 32))
- return -EINVAL;
-
- if (s[i] != 0)
- return -EINVAL;
-
- *ret = t;
- return 0;
-}
-
-static sd_id128_t make_v4_uuid(sd_id128_t id) {
- /* Stolen from generate_random_uuid() of drivers/char/random.c
- * in the kernel sources */
-
- /* Set UUID version to 4 --- truly random generation */
- id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40;
-
- /* Set the UUID variant to DCE */
- id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80;
-
- return id;
-}
-
-_public_ int sd_id128_get_machine(sd_id128_t *ret) {
- static thread_local sd_id128_t saved_machine_id;
- static thread_local bool saved_machine_id_valid = false;
- _cleanup_close_ int fd = -1;
- char buf[33];
- unsigned j;
- sd_id128_t t;
- int r;
-
- assert_return(ret, -EINVAL);
-
- if (saved_machine_id_valid) {
- *ret = saved_machine_id;
- return 0;
- }
-
- fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0)
- return -errno;
-
- r = loop_read_exact(fd, buf, 33, false);
- if (r < 0)
- return r;
- if (buf[32] !='\n')
- return -EIO;
-
- for (j = 0; j < 16; j++) {
- int a, b;
-
- a = unhexchar(buf[j*2]);
- b = unhexchar(buf[j*2+1]);
-
- if (a < 0 || b < 0)
- return -EIO;
-
- t.bytes[j] = a << 4 | b;
- }
-
- saved_machine_id = t;
- saved_machine_id_valid = true;
-
- *ret = t;
- return 0;
-}
-
-_public_ int sd_id128_get_boot(sd_id128_t *ret) {
- static thread_local sd_id128_t saved_boot_id;
- static thread_local bool saved_boot_id_valid = false;
- _cleanup_close_ int fd = -1;
- char buf[36];
- unsigned j;
- sd_id128_t t;
- char *p;
- int r;
-
- assert_return(ret, -EINVAL);
-
- if (saved_boot_id_valid) {
- *ret = saved_boot_id;
- return 0;
- }
-
- fd = open("/proc/sys/kernel/random/boot_id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0)
- return -errno;
-
- r = loop_read_exact(fd, buf, 36, false);
- if (r < 0)
- return r;
-
- for (j = 0, p = buf; j < 16; j++) {
- int a, b;
-
- if (p >= buf + 35)
- return -EIO;
-
- if (*p == '-') {
- p++;
- if (p >= buf + 35)
- return -EIO;
- }
-
- a = unhexchar(p[0]);
- b = unhexchar(p[1]);
-
- if (a < 0 || b < 0)
- return -EIO;
-
- t.bytes[j] = a << 4 | b;
-
- p += 2;
- }
-
- saved_boot_id = t;
- saved_boot_id_valid = true;
-
- *ret = t;
- return 0;
-}
-
-_public_ int sd_id128_randomize(sd_id128_t *ret) {
- sd_id128_t t;
- int r;
-
- assert_return(ret, -EINVAL);
-
- r = dev_urandom(&t, sizeof(t));
- if (r < 0)
- return r;
-
- /* Turn this into a valid v4 UUID, to be nice. Note that we
- * only guarantee this for newly generated UUIDs, not for
- * pre-existing ones. */
-
- *ret = make_v4_uuid(t);
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff