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Diffstat (limited to 'src/libsystemd/sd-id128/sd-id128.c')
-rw-r--r--src/libsystemd/sd-id128/sd-id128.c114
1 files changed, 25 insertions, 89 deletions
diff --git a/src/libsystemd/sd-id128/sd-id128.c b/src/libsystemd/sd-id128/sd-id128.c
index d9c0116f60..1470e4c01a 100644
--- a/src/libsystemd/sd-id128/sd-id128.c
+++ b/src/libsystemd/sd-id128/sd-id128.c
@@ -25,6 +25,7 @@
#include "fd-util.h"
#include "hexdecoct.h"
+#include "id128-util.h"
#include "io-util.h"
#include "macro.h"
#include "random-util.h"
@@ -93,117 +94,52 @@ _public_ int sd_id128_from_string(const char s[], sd_id128_t *ret) {
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;
+ static thread_local sd_id128_t saved_machine_id = {};
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 (sd_id128_is_null(saved_machine_id)) {
+ r = id128_read("/etc/machine-id", ID128_PLAIN, &saved_machine_id);
+ if (r < 0)
+ return r;
- if (a < 0 || b < 0)
- return -EIO;
-
- t.bytes[j] = a << 4 | b;
+ if (sd_id128_is_null(saved_machine_id))
+ return -EINVAL;
}
- saved_machine_id = t;
- saved_machine_id_valid = true;
-
- *ret = t;
+ *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;
- 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;
+ static thread_local sd_id128_t saved_boot_id = {};
int r;
assert_return(ret, -EINVAL);
- if (saved_boot_id_valid) {
- *ret = saved_boot_id;
- return 0;
+ 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;
}
- 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;
+ *ret = saved_boot_id;
+ return 0;
+}
- t.bytes[j] = a << 4 | b;
+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 */
- p += 2;
- }
+ /* Set UUID version to 4 --- truly random generation */
+ id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40;
- saved_boot_id = t;
- saved_boot_id_valid = true;
+ /* Set the UUID variant to DCE */
+ id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80;
- *ret = t;
- return 0;
+ return id;
}
_public_ int sd_id128_randomize(sd_id128_t *ret) {