void
_lgtd_err(void (*errfn)(int, const char *, ...),
int eval,
const char *fmt,
...)
{
int errsave = errno;
va_list ap;
va_start(ap, fmt);
// lgtd_cleanup is probably going to free some of the arguments we got, so
// let's print to a buffer before we call err.
char errmsg[LGTD_ERROR_MSG_BUFSIZE];
vsnprintf(errmsg, sizeof(errmsg), fmt, ap);
va_end(ap);
lgtd_cleanup();
lgtd_log_header("ERR", false);
errno = errsave;
errfn(eval, errmsg);
}
static void
lgtd_usage(const char *progname)
{
printf(
"Usage: %s ...\n\n"
" [-l,--listen addr:port] Listen for JSON-RPC commands over TCP at\n"
" this address (can be repeated).\n"
" [-c,--command-pipe /command/fifo] Open an unidirectional JSON-RPC\n"
" command pipe at this location (can be\n"
" repeated).\n"
" [-s,--socket /unix/socket] Open an Unix socket at this location\n"
" (can be repeated).\n"
" [-d,--daemonize] Fork in the background.\n"
" [-p,--pidfile /path/to/pid.file] Write lightsd's pid in the given file.\n"
" [-u,--user user] Drop privileges to this user (and the\n"
" group of this user if -g is missing).\n"
" [-g,--group group] Drop privileges to this group (-g requires\n"
" the -u option to be used).\n"
" [-S,--syslog] Divert logging from the console to syslog.\n"
" [-F,--syslog-facility] Facility to use with syslog (defaults to\n"
" daemon, other possible values are user and\n"
" local0-7, see syslog(3)).\n"
" [-I,--syslog-ident] Identifier to use with syslog (defaults to\n"
" lightsd).\n"
" [-t,--no-timestamps] Disable timestamps in the console logs.\n"
" [-h,--help] Display this.\n"
" [-V,--version] Display version and build information.\n"
" [-v,--verbosity debug|info|warning|error]\n"
"\nor,\n\n"
" --prefix Display the install prefix for lightsd.\n"
"\nor,\n\n"
" --rundir Display the runtime directory for lightsd.\n",
progname
);
lgtd_cleanup();
exit(0);
}
int
main(int argc, char *argv[], char *envp[])
{
char progname[32] = { 0 };
memcpy(progname, argv[0], LGTD_MIN(sizeof(progname) - 1, strlen(argv[0])));
lgtd_daemon_setup_proctitle(argc, argv, envp);
lgtd_configure_libevent();
lgtd_setup_signal_handling();
static const struct option long_opts[] = {
{"listen", required_argument, NULL, 'l'},
{"command-pipe", required_argument, NULL, 'c'},
{"socket", required_argument, NULL, 's'},
{"foreground", no_argument, NULL, 'f'},
{"daemonize", no_argument, NULL, 'd'},
{"pidfile", required_argument, NULL, 'p'},
{"user", required_argument, NULL, 'u'},
{"group", required_argument, NULL, 'g'},
{"syslog", no_argument, NULL, 'S'},
{"syslog-facility", required_argument, NULL, 'F'},
{"syslog-ident", required_argument, NULL, 'I'},
{"no-timestamps", no_argument, NULL, 't'},
{"help", no_argument, NULL, 'h'},
{"verbosity", required_argument, NULL, 'v'},
{"version", no_argument, NULL, 'V'},
{"prefix", no_argument, NULL, 'P'},
{"rundir", no_argument, NULL, 'r'},
{NULL, 0, NULL, 0}
};
const char short_opts[] = "l:c:s:fdp:u:g:SF:I:thv:V";
if (argc == 1) {
lgtd_usage(progname);
}
for (int rv = getopt_long(argc, argv, short_opts, long_opts, NULL);
rv != -1;
rv = getopt_long(argc, argv, short_opts, long_opts, NULL)) {
switch (rv) {
case 'l':
(void)0;
char *sep = strrchr(optarg, ':');
if (!sep || !sep[1]) {
lgtd_usage(progname);
}
*sep = '\0';
if (!lgtd_listen_open(optarg, sep + 1)) {
exit(1);
}
break;
case 'c':
if (!lgtd_command_pipe_open(optarg)) {
exit(1);
}
break;
case 's':
if (!lgtd_listen_unix_open(optarg)) {
exit(1);
}
break;
case 'f':
lgtd_opts.foreground = true;
break;
case 'd':
lgtd_opts.foreground = false;
break;
case 'p':
lgtd_opts.pidfile = optarg;
break;
case 'u':
lgtd_opts.user = optarg;
break;
case 'g':
lgtd_opts.group = optarg;
break;
case 'S':
lgtd_opts.syslog = true;
break;
case 'F':
lgtd_opts.syslog_facility = lgtd_daemon_syslog_facilitytoi(optarg);
break;
case 'I':
lgtd_opts.syslog_ident = optarg;
break;
case 't':
lgtd_opts.log_timestamps = false;
break;
case 'h':
lgtd_usage(progname);
case 'v':
for (int i = 0;;) {
const char *verbose_levels[] = {
"debug", "info", "warning", "error"
};
if (!strcasecmp(optarg, verbose_levels[i])) {
lgtd_opts.verbosity = i;
break;
}
if (++i == LGTD_ARRAY_SIZE(verbose_levels)) {
lgtd_errx(1, "Unknown verbosity level: %s", optarg);
}
}
break;
case 'V':
printf("%s %s\n", progname, LGTD_VERSION);
lgtd_cleanup();
return 0;
case 'P':
printf(
"%s%s\n", LGTD_INSTALL_PREFIX, LGTD_INSTALL_PREFIX[
LGTD_ARRAY_SIZE(LGTD_INSTALL_PREFIX) - 1
] != '/' ? "/" : ""
);
return 0;
case 'r':
printf(
"%s%s\n", LGTD_RUNTIME_DIRECTORY, LGTD_RUNTIME_DIRECTORY[
LGTD_ARRAY_SIZE(LGTD_RUNTIME_DIRECTORY) - 1
] != '/' ? "/" : ""
);
return 0;
default:
lgtd_usage(progname);
}
}
argc -= optind;
argv += optind;
// Ideally we should parse the syslog relation options first and call that
// before anything can be logged:
lgtd_log_setup();
if (lgtd_opts.user) {
lgtd_daemon_set_user(lgtd_opts.user);
lgtd_daemon_set_group(lgtd_opts.group);
// create the pidfile before we drop privileges:
if (lgtd_opts.pidfile
&& !lgtd_daemon_write_pidfile(lgtd_opts.pidfile)) {
lgtd_warn("couldn't write pidfile at %s", lgtd_opts.pidfile);
}
lgtd_daemon_drop_privileges();
} else if (lgtd_opts.group) {
lgtd_errx(1, "please, specify an user with the -u option");
}
lgtd_daemon_die_if_running_as_root_unless_requested(lgtd_opts.user);
lgtd_lifx_wire_setup();
if (!lgtd_lifx_discovery_setup() || !lgtd_lifx_broadcast_setup()) {
lgtd_err(1, "can't setup lightsd");
}
if (!lgtd_opts.foreground) {
lgtd_info("forking into the background now...");
if (!lgtd_daemon_unleash()) {
lgtd_err(1, "can't fork to the background");
}
}
// update the pidfile after we've forked:
if (lgtd_opts.pidfile && !lgtd_daemon_write_pidfile(lgtd_opts.pidfile)) {
lgtd_warn("couldn't write pidfile at %s", lgtd_opts.pidfile);
}
lgtd_lifx_discovery_start();
// update at least once: so that if no bulbs are discovered we still get a
// clear status line.
lgtd_daemon_update_proctitle();
event_base_dispatch(lgtd_ev_base);
if (lgtd_last_signal_received) {
lgtd_info(
"received signal %d (%s), exiting...",
lgtd_last_signal_received, strsignal(lgtd_last_signal_received)
);
}
lgtd_cleanup();
return 0;
}
