/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: mqttd.c,v 1.5 2017/10/08 22:49:25 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"
#include "mqttd.h"
#include "rtlm.h"
#include "utils.h"
#include "daemon.h"


cfg_root_t cfg;
sessions_t Sessions;
sched_root_task_t *root;
sqlite3 *acc, *pub;
FILE *logg;
extern char compiled[], compiledby[], compilehost[];
static char szCfgName[MAXPATHLEN];
volatile intptr_t Kill;


static void
Usage(void)
{
	printf(	" -= MQTT Broker =- MQTT Service from ELWIX\n"
		"=== %s@%s === Compiled: %s ===\n\n"
		"\t-c <config>\tService config\n"
		"\t-b\t\tBatch mode\n"
		"\t-v\t\tVerbose (more -vvv, more verbose)\n"
		"\t-h\t\tHelp! This screen\n\n", 
		compiledby, compilehost, compiled);
}

static void
sigHand(int sig)
{
	int stat;

	switch (sig) {
		case SIGHUP:
			cfgUnloadConfig(&cfg);
			if (!cfgLoadConfig(szCfgName, &cfg)) {
				EVERBOSE(1, "Config reload OK!");
				break;
			}

			ELIBERR(cfg);
		case SIGINT:
		case SIGTERM:
			EVERBOSE(1, "Terminate MQTT service in progress");
			Kill++;
			break;
		case SIGCHLD:
			while (waitpid(-1, &stat, WNOHANG) > 0);
			break;
		case SIGPIPE:
			break;
	}
}


int
main(int argc, char **argv)
{
	char ch, batch = 0;
	register int i;
	int sock = -1, ret = 0;
	struct passwd *pass;
	struct sigaction sa;
	ait_val_t v;

	TAILQ_INIT(&Sessions);

	strlcpy(szCfgName, DEFAULT_CONFIG, sizeof szCfgName);
	while ((ch = getopt(argc, argv, "hvbc:")) != -1)
		switch (ch) {
			case 'c':
				strlcpy(szCfgName, optarg, sizeof szCfgName);
				break;
			case 'b':
				batch++;
				break;
			case 'v':
				e_incVerbose;
				EVERBS(2) elwix_Debug |= ELWIX_DEBUG_TRACE;
				break;
			case 'h':
			default:
				Usage();
				return 1;
		}
	argc -= optind;
	argv += optind;

	if (cfgLoadConfig(szCfgName, &cfg)) {
		printf("Error:: can't load #%d - %s\n", cfg_GetErrno(), cfg_GetError());
		return 1;
	}
	openlog("mqttd", LOG_PID | LOG_CONS, LOG_DAEMON);
	/* load 3 plugins */
	for (i = 0; i < 3; i++)
		if (!mqttLoadRTLM(&cfg, i)) {
			printf("Error:: Can't load RTL module\n");
			mqttUnloadRTLM(acc);
			mqttUnloadRTLM(pub);
			mqttUnloadRTLM(logg);
			cfgUnloadConfig(&cfg);
			closelog();
			return 2;
		}
	acc = call.OpenACC(&cfg);
	if (!acc) {
		ret = 3;
		goto end;
	}
	pub = call.OpenPUB(&cfg);
	if (!pub) {
		ret = 3;
		goto end;
	}
	logg = call.OpenLOG(&cfg);
	if (!logg) {
		ret = 3;
		goto end;
	}


	if (mqttMkDir(&cfg)) {
		printf("Error:: in statedir #%d - %s\n", errno, strerror(errno));
		ret = 3;
		goto end;
	}

	if (!batch)
		switch (fork()) {
			case -1:
				printf("Error:: in fork() #%d - %s\n", errno, strerror(errno));
				ret = 5;
				goto end;
			case 0:
				setsid();

				ret = open("/dev/null", O_RDWR);
				if (ret != -1) {
					dup2(ret, STDIN_FILENO);
					dup2(ret, STDOUT_FILENO);
					dup2(ret, STDERR_FILENO);
					close(ret);
				}
				EVERBOSE(2, "Welcome MQTT service into shadow land!");
				break;
			default:
				EVERBOSE(2, "MQTT service go to shadow land ...");
				sleep(1);
				ret = 0;
				goto end;
		}
	else
		EVERBOSE(1, "Start service in batch mode ...");

	memset(&sa, 0, sizeof sa);
	sigemptyset(&sa.sa_mask);
	sa.sa_handler = sigHand;
	sigaction(SIGHUP, &sa, NULL);
	sigaction(SIGINT, &sa, NULL);
	sigaction(SIGTERM, &sa, NULL);
	sigaction(SIGCHLD, &sa, NULL);
	sigaction(SIGPIPE, &sa, NULL);
	EVERBOSE(2, "Service is ready for starting engine ...");

	if ((sock = srv_Socket(&cfg)) == -1) {
		ret = 4;
		goto end;
	}

	cfg_loadAttribute(&cfg, "mqttd", "user", &v, MQTT_USER);
	pass = getpwnam(AIT_GET_STR(&v));
	AIT_FREE_VAL(&v);
	if (pass) {
		setgid(pass->pw_gid);
		setuid(pass->pw_uid);
		EVERBOSE(2, "Try to change group #%d and user #%d", pass->pw_gid, pass->pw_uid);
	}

	if (!(root = schedBegin())) {
		ELIBERR(sched);
		ret = 6;
		goto end;
	}

	/* go catch the cat ... */
	Run(sock);

	schedEnd(&root);
end:	/* free all resources */
	srv_Close(sock);
	call.CloseLOG(logg);
	call.ClosePUB(pub);
	call.CloseACC(acc);
	mqttUnloadRTLM(acc);
	mqttUnloadRTLM(pub);
	mqttUnloadRTLM(logg);
	cfgUnloadConfig(&cfg);
	closelog();
	return ret;
}