sd-id128.c revision 87d2c1ff6a7375f03476767e6f59454bcc5cd04b
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "sd-id128.h"
#include "util.h"
#include "macro.h"
unsigned n;
assert(s);
for (n = 0; n < 16; n++) {
}
s[32] = 0;
return s;
}
unsigned n;
sd_id128_t t;
assert(s);
for (n = 0; n < 16; n++) {
int a, b;
a = unhexchar(s[n*2]);
if (a < 0)
return -EINVAL;
if (b < 0)
return -EINVAL;
t.bytes[n] = (a << 4) | b;
}
if (s[32] != 0)
return -EINVAL;
*ret = t;
return 0;
}
* in the kernel sources */
/* Set UUID version to 4 --- truly random generation */
/* Set the UUID variant to DCE */
return id;
}
static __thread bool saved_machine_id_valid = false;
int fd;
char buf[32];
ssize_t k;
unsigned j;
sd_id128_t t;
if (saved_machine_id_valid) {
*ret = saved_machine_id;
return 0;
}
if (fd < 0)
return -errno;
if (k < 0)
return (int) k;
if (k < 32)
return -EIO;
for (j = 0; j < 16; j++) {
int a, b;
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;
}
static __thread bool saved_boot_id_valid = false;
int fd;
char buf[36];
ssize_t k;
unsigned j;
sd_id128_t t;
char *p;
if (saved_boot_id_valid) {
*ret = saved_boot_id;
return 0;
}
if (fd < 0)
return -errno;
if (k < 0)
return (int) k;
if (k < 36)
return -EIO;
for (j = 0, p = buf; j < 16; j++) {
int a, b;
if (*p == '-')
p++;
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;
}
int fd;
ssize_t k;
sd_id128_t t;
if (fd < 0)
return -errno;
if (k < 0)
return (int) k;
if (k < 16)
return -EIO;
/* 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 = sd_id128_make_v4_uuid(t);
return 0;
}