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/*
TACACS+ D-Bus Daemon code
Copyright (c) 2018-2019, AT&T Intellectual Property.
Copyright (c) 2015 Brocade Communications Systems, Inc.
SPDX-License-Identifier: GPL-2.0-only
*/
#include <pthread.h>
#include "global.h"
#include "main.h"
#include "statistics.h"
#include "tacplus_srv_conn.h"
/*
* TODO
* add license to all source files
*/
static int run = 1; /* Initially to enter while loop */
static int reload = 0;
static ConnectionControl _connControl = { .state = { .offline = false } };
ConnectionControl *connControl = &_connControl;
static void signal_wait(sigset_t *set)
{
int s, sig;
for (;;) {
s = sigwait(set, &sig);
if (s != 0) {
syslog(LOG_ERR, "Signal handler sigwait() call returned error");
}
syslog(LOG_DEBUG, "Signal handler received: %d\n", sig);
switch(sig) {
case SIGTERM:
syslog(LOG_DEBUG, "Signal handler caught SIGTERM");
run = 0;
return;
case SIGHUP:
syslog(LOG_DEBUG, "Signal handler caught SIGHUP");
reload = 1;
return;
default:
syslog(LOG_DEBUG, "Ignoring signal %d", sig);
break;
}
}
}
static int setup_service(const char *tacplus_cfg)
{
int ret = 0;
/* enable read timeout handling */
tac_enable_readtimeout(1);
#ifndef HAVE_LIBTAC_EVENT
/* libtac by default uses PAP auth method. tac_login is a global/extern variable of libtac */
strncpy(tac_login, "login", 5);
#endif
connControl->opts = tacplus_parse_reload_options(tacplus_cfg,
&connControl->opts);
if(connControl->opts == NULL) {
syslog(LOG_NOTICE, "No valid configuration");
ret = -1;
goto done;
}
/* Set global DSCP marking in libtac library */
tac_set_dscp(connControl->opts->dscp);
syslog(LOG_INFO, "Configuration loaded successfully");
ret = create_statistics(connControl->opts->n_servers);
if(ret != 0) {
syslog(LOG_ERR, "Failed to allocate statistics");
goto done;
}
syslog(LOG_DEBUG, "Statistics allocated successfully");
done:
return ret;
}
static int reload_service(const char *tacplus_cfg)
{
int ret;
reload = 0;
syslog(LOG_NOTICE, "Reloading");
dbus_service_pause();
free_statistics();
ret = setup_service(tacplus_cfg);
ret |= dbus_service_resume();
return ret;
}
int main(int argc, char *argv[])
{
int ret = 0;
sigset_t set;
char *tacplus_cfg;
char *tacplus_pid;
if (argc == 3) {
tacplus_cfg = argv[1];
tacplus_pid = argv[2];
}
else {
fprintf(stderr, "Insufficient arguments to the daemon\n");
return -1;
}
if (getenv("DEBUG"))
tac_debug_enable = 1;
if (!getenv("NODAEMON")) {
openlog("tacplusd", LOG_ODELAY, LOG_AUTH);
daemonize(tacplus_pid);
}
else
openlog("tacplusd", LOG_PERROR, LOG_AUTH);
/* from this point onwards, we're the child */
syslog(LOG_NOTICE, "Tacplusd daemonized successfully");
syslog(LOG_DEBUG, "Tacplusd started with %s\n", tacplus_cfg);
sigemptyset(&set);
sigaddset(&set, SIGQUIT);
sigaddset(&set, SIGKILL);
sigaddset(&set, SIGUSR1);
sigaddset(&set, SIGUSR2);
sigaddset(&set, SIGTERM);
sigaddset(&set, SIGHUP);
ret = pthread_sigmask(SIG_BLOCK, &set, NULL);
if (ret != 0) {
syslog(LOG_ERR, "Blocking signals failed");
goto done;
}
pthread_mutex_init(&connControl->state.lock, NULL);
dbus_service_init();
if (setup_service(tacplus_cfg) != 0) {
ret = -1;
goto done;
}
if (dbus_service_start() < 0) {
syslog(LOG_ERR, "Failed to start DBus service");
ret = -1;
goto done;
}
syslog(LOG_DEBUG, "DBus service setup successful");
/* Send an offline state change signal to indicate we have started up */
signal_offline_state_change();
while (run) {
if (reload && (ret = reload_service(tacplus_cfg)) != 0)
goto done;
signal_wait(&set);
ret = dbus_service_failed() ? 1 : 0;
}
done:
syslog(LOG_NOTICE, "Stopping");
dbus_service_stop();
dbus_service_wait();
dbus_service_deinit();
free_statistics();
cleanup_tacplus_options(&connControl->opts);
syslog(LOG_NOTICE, "Shutting down");
return ret;
}
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