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authorLennart Poettering <lennart@poettering.net>2011-10-07 21:06:39 +0200
committerLennart Poettering <lennart@poettering.net>2011-10-07 22:02:05 +0200
commit87d2c1ff6a7375f03476767e6f59454bcc5cd04b (patch)
tree26824a2485942702b3472cc73191c01e78c622d1 /src/machine-id-setup.c
parent9a36607584bbd1d78775353e022a51794b4e27b1 (diff)
journal: add preliminary incomplete implementation
Diffstat (limited to 'src/machine-id-setup.c')
-rw-r--r--src/machine-id-setup.c40
1 files changed, 9 insertions, 31 deletions
diff --git a/src/machine-id-setup.c b/src/machine-id-setup.c
index 519521fe67..9b25b10438 100644
--- a/src/machine-id-setup.c
+++ b/src/machine-id-setup.c
@@ -31,21 +31,12 @@
#include "macro.h"
#include "util.h"
#include "log.h"
-
-static void make_v4_uuid(unsigned char *id) {
- /* Stolen from generate_random_uuid() of drivers/char/random.c
- * in the kernel sources */
-
- /* Set UUID version to 4 --- truly random generation */
- id[6] = (id[6] & 0x0F) | 0x40;
-
- /* Set the UUID variant to DCE */
- id[8] = (id[8] & 0x3F) | 0x80;
-}
+#include "sd-id128.h"
static int generate(char id[34]) {
- int fd;
- unsigned char buf[16], *p;
+ int fd, r;
+ unsigned char *p;
+ sd_id128_t buf;
char *q;
ssize_t k;
@@ -68,26 +59,13 @@ static int generate(char id[34]) {
}
/* If that didn't work, generate a random machine id */
- fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0) {
- log_error("Failed to open /dev/urandom: %m");
- return -errno;
- }
-
- k = loop_read(fd, buf, sizeof(buf), false);
- close_nointr_nofail(fd);
-
- if (k != sizeof(buf)) {
- log_error("Failed to read /dev/urandom: %s", strerror(k < 0 ? -k : EIO));
- return k < 0 ? (int) k : -EIO;
+ r = sd_id128_randomize(&buf);
+ if (r < 0) {
+ log_error("Failed to open /dev/urandom: %s", strerror(-r));
+ 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.*/
- make_v4_uuid(buf);
-
- for (p = buf, q = id; p < buf + sizeof(buf); p++, q += 2) {
+ for (p = buf.bytes, q = id; p < buf.bytes + sizeof(buf); p++, q += 2) {
q[0] = hexchar(*p >> 4);
q[1] = hexchar(*p & 15);
}