int main(int argc, char *argv[]) {
const char *id = NULL;
int retval = EXIT_SUCCESS;
int r;
/* This is mostly intended to be used for scripts which want
* to detect whether we are being run in a virtualized
* environment or not */
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
switch (arg_mode) {
case ANY_VIRTUALIZATION: {
int v;
v = detect_virtualization(&id);
if (v < 0) {
log_error("Failed to check for virtualization: %s", strerror(-v));
return EXIT_FAILURE;
}
retval = v != VIRTUALIZATION_NONE ? EXIT_SUCCESS : EXIT_FAILURE;
break;
}
case ONLY_CONTAINER:
r = detect_container(&id);
if (r < 0) {
log_error("Failed to check for container: %s", strerror(-r));
return EXIT_FAILURE;
}
retval = r > 0 ? EXIT_SUCCESS : EXIT_FAILURE;
break;
case ONLY_VM:
r = detect_vm(&id);
if (r < 0) {
log_error("Failed to check for vm: %s", strerror(-r));
return EXIT_FAILURE;
}
retval = r > 0 ? EXIT_SUCCESS : EXIT_FAILURE;
break;
}
if (!arg_quiet)
puts(id ? id : "none");
return retval;
}
static int generate(char id[34]) {
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 */
fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd >= 0) {
k = loop_read(fd, id, 32, false);
close_nointr_nofail(fd);
if (k >= 32) {
id[32] = '\n';
id[33] = 0;
log_info("Initializing machine ID from D-Bus machine ID.");
return 0;
}
}
/* 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 */
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) {
r = shorten_uuid(id, uuid);
if (r >= 0) {
log_info("Initializing machine ID from KVM UUID.");
return 0;
}
}
}
}
/* If that didn't work either, see if we are running in a
* container, and a machine ID was passed in via
* $container_uuid the way libvirt/LXC does it */
r = detect_container(NULL);
if (r > 0) {
char *e;
r = getenv_for_pid(1, "container_uuid", &e);
if (r > 0) {
if (strlen(e) >= 36) {
r = shorten_uuid(id, e);
if (r >= 0) {
log_info("Initializing machine ID from container UUID.");
free(e);
return 0;
}
}
free(e);
}
}
/* 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.bytes, q = id; p < buf.bytes + sizeof(buf); p++, q += 2) {
q[0] = hexchar(*p >> 4);
q[1] = hexchar(*p & 15);
}
id[32] = '\n';
id[33] = 0;
log_info("Initializing machine ID from random generator.");
return 0;
}
