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/***
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 "sd-id128.h"
#include "fd-util.h"
#include "hexdecoct.h"
#include "id128-util.h"
#include "io-util.h"
#include "khash.h"
#include "macro.h"
#include "random-util.h"
#include "util.h"
_public_ char *sd_id128_to_string(sd_id128_t id, char s[SD_ID128_STRING_MAX]) {
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);
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;
if (ret)
*ret = t;
return 0;
}
_public_ int sd_id128_get_machine(sd_id128_t *ret) {
static thread_local sd_id128_t saved_machine_id = {};
int r;
assert_return(ret, -EINVAL);
if (sd_id128_is_null(saved_machine_id)) {
r = id128_read("/etc/machine-id", ID128_PLAIN, &saved_machine_id);
if (r < 0)
return r;
if (sd_id128_is_null(saved_machine_id))
return -EINVAL;
}
*ret = saved_machine_id;
return 0;
}
_public_ int sd_id128_get_boot(sd_id128_t *ret) {
static thread_local sd_id128_t saved_boot_id = {};
int r;
assert_return(ret, -EINVAL);
if (sd_id128_is_null(saved_boot_id)) {
r = id128_read("/proc/sys/kernel/random/boot_id", ID128_UUID, &saved_boot_id);
if (r < 0)
return r;
}
*ret = saved_boot_id;
return 0;
}
_public_ int sd_id128_get_invocation(sd_id128_t *ret) {
static thread_local sd_id128_t saved_invocation_id = {};
int r;
assert_return(ret, -EINVAL);
if (sd_id128_is_null(saved_invocation_id)) {
const char *e;
e = secure_getenv("INVOCATION_ID");
if (!e)
return -ENXIO;
r = sd_id128_from_string(e, &saved_invocation_id);
if (r < 0)
return r;
}
*ret = saved_invocation_id;
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_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;
}
_public_ int sd_id128_get_machine_app_specific(sd_id128_t app_id, sd_id128_t *ret) {
_cleanup_(khash_unrefp) khash *h = NULL;
sd_id128_t m, result;
const void *p;
int r;
assert_return(ret, -EINVAL);
r = sd_id128_get_machine(&m);
if (r < 0)
return r;
r = khash_new_with_key(&h, "hmac(sha256)", &m, sizeof(m));
if (r < 0)
return r;
r = khash_put(h, &app_id, sizeof(app_id));
if (r < 0)
return r;
r = khash_digest_data(h, &p);
if (r < 0)
return r;
/* We chop off the trailing 16 bytes */
memcpy(&result, p, MIN(khash_get_size(h), sizeof(result)));
*ret = make_v4_uuid(result);
return 0;
}
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