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