bool master_running(void)
{
NihError *err;
/* is manager already running under cgmanager.lower */
server_conn = nih_dbus_connect(CGPROXY_DBUS_PATH, NULL);
if (server_conn) {
dbus_connection_unref (server_conn);
return true;
}
err = nih_error_get();
nih_free(err);
/* is manager running under cgmanager */
server_conn = nih_dbus_connect(CGMANAGER_DBUS_PATH, NULL);
if (server_conn) {
dbus_connection_unref (server_conn);
return true;
}
err = nih_error_get();
nih_free(err);
return false;
}
static bool daemon_running(void)
{
DBusConnection *server_conn;
NihError *err;
server_conn = nih_dbus_connect(CGMANAGER_DBUS_PATH, NULL);
if (server_conn) {
dbus_connection_unref (server_conn);
return true;
}
err = nih_error_get();
nih_free(err);
return false;
}
static void cgm_dbus_disconnected(DBusConnection *connection)
{
NihError *err;
dbus_connection_unref(connection);
while (1) {
server_conn = nih_dbus_connect(CGPROXY_DBUS_PATH, cgm_dbus_disconnected);
if (server_conn)
return;
err = nih_error_get();
nih_error("Failed to re-open connection to %s: %s",
CGPROXY_DBUS_PATH, err->message);
nih_free(err);
nih_error("re-trying in 5 seconds\n");
sleep(5);
}
}
bool lxc_init_cgmanager(void)
{
DBusError dbus_error;
DBusConnection *connection;
dbus_error_init(&dbus_error);
connection = nih_dbus_connect(CGMANAGER_DBUS_SOCK, cgmanager_disconnected);
if (!connection) {
NihError *nerr;
nerr = nih_error_get();
ERROR("Error opening cgmanager connection at %s: %s", CGMANAGER_DBUS_SOCK,
nerr->message);
nih_free(nerr);
dbus_error_free(&dbus_error);
return false;
}
dbus_connection_set_exit_on_disconnect(connection, FALSE);
dbus_error_free(&dbus_error);
cgroup_manager = nih_dbus_proxy_new(NULL, connection,
NULL /* p2p */,
"/org/linuxcontainers/cgmanager", NULL, NULL);
dbus_connection_unref(connection);
if (!cgroup_manager) {
NihError *nerr;
nerr = nih_error_get();
ERROR("Error opening cgmanager proxy: %s", nerr->message);
nih_free(nerr);
return false;
}
active_cg_ops = &cgmanager_ops;
// force fd passing negotiation
if (cgmanager_ping_sync(NULL, cgroup_manager, 0) != 0) {
NihError *nerr;
nerr = nih_error_get();
ERROR("Error pinging cgroup manager: %s", nerr->message);
nih_free(nerr);
}
return true;
}
int setup_proxy(void)
{
bool exists_upper = false, exists_lower = false;
NihError *err;
/* When running in container, /sys/fs/cgroup will have been
already mounted. But it may be ro */
if (is_ro_mount(CGDIR))
turn_mount_rw(CGDIR);
/*
* If /sys/fs/cgroup/cgmanager.lower exists,
* if /sys/fs/cgroup/cgmanager exists, then exit (proxy already running)
* start up, connect to .lower
* else
* if /sys/fs/cgroup/cgmanager exists, move it to /sys/fs/cgroup/cgmanager.lower
* start up and connect to .lower
*/
server_conn = nih_dbus_connect(CGMANAGER_DBUS_PATH, NULL);
if (server_conn) {
exists_upper = true;
dbus_connection_unref (server_conn);
} else {
err = nih_error_get();
nih_free(err);
}
server_conn = nih_dbus_connect(CGPROXY_DBUS_PATH, cgm_dbus_disconnected);
if (server_conn) {
exists_lower = true;
} else {
err = nih_error_get();
nih_free(err);
}
if (exists_upper && exists_lower) {
dbus_connection_unref (server_conn);
nih_fatal("proxy already running");
return -1; // proxy already running
}
if (exists_lower)
// we've got the sock we need, all set.
return 0;
if (exists_upper) {
//move /sys/fs/cgroup/cgmanager to /sys/fs/cgroup/cgmanager.lower
if (mkdir(CGPROXY_DIR, 0755) < 0 && errno != EEXIST) {
nih_fatal("failed to create lower sock");
return -1;
}
if (mount(CGMANAGER_DIR, CGPROXY_DIR, "none", MS_MOVE, 0) < 0) {
/* it wasn't a mount, meaning we are at the host
* level on an old kernel. So rename it */
if (unlink(CGPROXY_SOCK) && errno != ENOENT)
nih_warn("failed to remove %s: %s", CGPROXY_SOCK,
strerror(errno));
if (rmdir(CGPROXY_DIR) && errno != ENOENT)
nih_warn("failed to remove %s: %s", CGPROXY_DIR,
strerror(errno));
if (rename(CGMANAGER_DIR, CGPROXY_DIR) < 0) {
nih_fatal("unable to rename the socket");
return -1;
}
if (mkdir(CGMANAGER_DIR, 0755) < 0) {
nih_fatal("unable to create socket dir");
return -1;
}
}
}
server_conn = nih_dbus_connect(CGPROXY_DBUS_PATH, cgm_dbus_disconnected);
if (!server_conn) {
err = nih_error_get();
nih_fatal("Failed to open connection to %s: %s",
CGPROXY_DBUS_PATH, err->message);
nih_free(err);
return -1;
}
return 0;
}
int
main (int argc,
char *argv[])
{
char ** args;
DBusConnection * connection;
struct udev * udev;
struct udev_monitor *udev_monitor;
int ret;
nih_main_init (argv[0]);
nih_option_set_synopsis (_("Bridge udev events into upstart"));
nih_option_set_help (
_("By default, upstart-udev-bridge does not detach from the "
"console and remains in the foreground. Use the --daemon "
"option to have it detach."));
args = nih_option_parser (NULL, argc, argv, options, FALSE);
if (! args)
exit (1);
/* Initialise the connection to Upstart */
connection = NIH_SHOULD (nih_dbus_connect (DBUS_ADDRESS_UPSTART, upstart_disconnected));
if (! connection) {
NihError *err;
err = nih_error_get ();
nih_fatal ("%s: %s", _("Could not connect to Upstart"),
err->message);
nih_free (err);
exit (1);
}
upstart = NIH_SHOULD (nih_dbus_proxy_new (NULL, connection,
NULL, DBUS_PATH_UPSTART,
NULL, NULL));
if (! upstart) {
NihError *err;
err = nih_error_get ();
nih_fatal ("%s: %s", _("Could not create Upstart proxy"),
err->message);
nih_free (err);
exit (1);
}
/* Initialise the connection to udev */
nih_assert (udev = udev_new ());
nih_assert (udev_monitor = udev_monitor_new_from_netlink (udev, "udev"));
nih_assert (udev_monitor_enable_receiving (udev_monitor) == 0);
udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
NIH_MUST (nih_io_add_watch (NULL, udev_monitor_get_fd (udev_monitor),
NIH_IO_READ,
(NihIoWatcher)udev_monitor_watcher,
udev_monitor));
/* Become daemon */
if (daemonise) {
if (nih_main_daemonise () < 0) {
NihError *err;
err = nih_error_get ();
nih_fatal ("%s: %s", _("Unable to become daemon"),
err->message);
nih_free (err);
exit (1);
}
/* Send all logging output to syslog */
openlog (program_name, LOG_PID, LOG_DAEMON);
nih_log_set_logger (nih_logger_syslog);
}
/* Handle TERM and INT signals gracefully */
nih_signal_set_handler (SIGTERM, nih_signal_handler);
NIH_MUST (nih_signal_add_handler (NULL, SIGTERM, nih_main_term_signal, NULL));
if (! daemonise) {
nih_signal_set_handler (SIGINT, nih_signal_handler);
NIH_MUST (nih_signal_add_handler (NULL, SIGINT, nih_main_term_signal, NULL));
}
ret = nih_main_loop ();
return ret;
}
int
main (int argc,
char *argv[])
{
char ** args;
DBusConnection * conn;
int fd, optval = 1, exitval = 1, ret;
DBusMessage *message = NULL, *reply = NULL;
DBusMessageIter iter;
dbus_uint32_t serial;;
nih_main_init (argv[0]);
nih_option_set_synopsis (_("Control group client"));
args = nih_option_parser (NULL, argc, argv, options, FALSE);
if (! args)
exit (1);
if (!controller)
usage(argv[0]);
if (pid == -1)
pid = getpid();
conn = nih_dbus_connect("unix:path=/tmp/cgmanager", NULL);
nih_assert (conn != NULL);
message = dbus_message_new_method_call(dbus_bus_get_unique_name(conn),
"/org/linuxcontainers/cgmanager",
"org.linuxcontainers.cgmanager0_0", "getPidCgroup");
if (!dbus_connection_get_socket(conn, &fd)) {
nih_dbus_error_raise_printf (DBUS_ERROR_INVALID_ARGS,
"Could not get socket");
return -1;
}
if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &optval, sizeof(optval)) == -1) {
perror("setsockopt");
return -1;
}
dbus_message_iter_init_append(message, &iter);
if (! dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING,
&controller)) {
nih_error_raise_no_memory ();
return -1;
}
dbus_message_iter_init_append(message, &iter);
if (! dbus_message_iter_append_basic (&iter, DBUS_TYPE_INT32,
&pid)) {
nih_error_raise_no_memory ();
return -1;
}
if (!dbus_connection_send(conn, message, &serial)) {
nih_error("failed to send dbus message");
return -1;
}
dbus_connection_flush(conn);
/* If we're sending our own pid, or if we're root, then
* we can send an SCM_CREDENTIAL
*/
if (pid == getpid() || geteuid() == 0) {
if (send_pid(fd, pid)) {
nih_error("Error sending pid over SCM_CREDENTIAL");
goto out;
}
}
while (!(reply = dbus_connection_pop_message(conn)))
dbus_connection_read_write(conn, -1);
if (dbus_message_get_reply_serial(reply) != serial) {
nih_error("wrong serial on reply");
goto out;
}
dbus_message_iter_init(reply, &iter);
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING) {
nih_error("Got bad reply type: %d", dbus_message_iter_get_arg_type(&iter));
goto out;
}
char *str_value;
dbus_message_iter_get_basic(&iter, &str_value);
printf("%s\n", str_value);
exitval = 0;
out:
if (message)
dbus_message_unref(message);
if (reply)
dbus_message_unref(reply);
dbus_connection_unref (conn);
exit(exitval);
}
