#include <fcntl.h>
#include <sys/mount.h>
+#include <systemd/sd-id128.h>
+
#include "machine-id-setup.h"
#include "macro.h"
#include "util.h"
#include "log.h"
+#include "virt.h"
static int generate(char id[34]) {
- int fd;
- char buf[16];
- char *p, *q;
+ int fd, r;
+ unsigned char *p;
+ sd_id128_t buf;
+ char *q;
ssize_t k;
+ const char *vm_id;
assert(id);
/* First, try reading the D-Bus machine id, unless it is a symlink */
- if ((fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW)) >= 0) {
+ fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd >= 0) {
- k = loop_read(fd, id, 33, false);
+ k = loop_read(fd, id, 32, false);
close_nointr_nofail(fd);
if (k >= 32) {
}
}
- /* If that didn't work, generate a random machine id */
- if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0) {
- log_error("Failed to open /dev/urandom: %m");
- return -errno;
- }
+ /* If that didn't work, see if we are running in qemu/kvm and a
+ * machine ID was passed in via -uuid on the qemu/kvm command
+ * line */
- k = loop_read(fd, buf, sizeof(buf), false);
- close_nointr_nofail(fd);
+ r = detect_vm(&vm_id);
+ if (r > 0 && streq(vm_id, "kvm")) {
+ char uuid[37];
+
+ fd = open("/sys/class/dmi/id/product_uuid", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fd >= 0) {
+ k = loop_read(fd, uuid, 36, false);
+ close_nointr_nofail(fd);
+
+ if (k >= 36) {
+ unsigned i, j;
+
+ for (i = 0, j = 0; i < 36 && j < 32; i++) {
+ int t;
+
+ t = unhexchar(uuid[i]);
+ if (t < 0)
+ continue;
+
+ id[j++] = hexchar(t);
+ }
- if (k != sizeof(buf)) {
- log_error("Failed to read /dev/urandom: %s", strerror(k < 0 ? -k : EIO));
- return k < 0 ? (int) k : -EIO;
+ if (i == 36 && j == 32) {
+ id[32] = '\n';
+ id[33] = 0;
+
+ log_info("Initializing machine ID from KVM UUID");
+ return 0;
+ }
+ }
+ }
+ }
+
+ /* If that didn't work, generate a random machine id */
+ r = sd_id128_randomize(&buf);
+ if (r < 0) {
+ log_error("Failed to open /dev/urandom: %s", strerror(-r));
+ return r;
}
- 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);
}
* will be owned by root it doesn't matter much, but maybe
* people look. */
- if ((fd = open("/etc/machine-id", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444)) >= 0)
+ fd = open("/etc/machine-id", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
+ if (fd >= 0)
writable = true;
else {
- if ((fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0) {
+ fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd < 0) {
umask(m);
log_error("Cannot open /etc/machine-id: %m");
return -errno;
/* Hmm, so, the id currently stored is not useful, then let's
* generate one */
- if ((r = generate(id)) < 0)
+ r = generate(id);
+ if (r < 0)
goto finish;
if (S_ISREG(st.st_mode) && writable) {
mkdir_p("/run/systemd", 0755);
- if ((r = write_one_line_file("/run/systemd/machine-id", id)) < 0) {
+ m = umask(0022);
+ r = write_one_line_file("/run/systemd/machine-id", id);
+ umask(m);
+
+ if (r < 0) {
log_error("Cannot write /run/systemd/machine-id: %s", strerror(-r));
unlink("/run/systemd/machine-id");