netsukuku/src/netsukuku.c

/* This file is part of Netsukuku
 * (c) Copyright 2005 Andrea Lo Pumo aka AlpT <alpt@freaknet.org>
 *
 * This source code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * Please refer to the GNU Public License for more details.
 *
 * You should have received a copy of the GNU Public License along with
 * this source code; if not, write to:
 * Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * --
 * netsukuku.c:
 * Where main() resides.
 */

#include "includes.h"

#include "common.h"
#include "conf.h"
#include "libnetlink.h"
#include "ll_map.h"
#include "request.h"
#include "pkts.h"
#include "if.h"
#include "bmap.h"
#include "netsukuku.h"
#include "qspn.h"
#include "accept.h"
#include "daemon.h"
#include "crypto.h"
#include "andna_cache.h"
#include "andna.h"
#include "radar.h"
#include "hook.h"
#include "rehook.h"
#include "ntk-console-server.h"
#include <pthread.h>


extern int errno;
extern char *optarg;
extern int optind, opterr, optopt;

int destroy_netsukuku_mutex;
int pid_saved;

int options_parsed = 0;			/* How many times parse_options() has been called */

void
save_pid(void)
{
	FILE *fd;

	if (!(fd = fopen(server_opt.pid_file, "w")))
		error("Couldn't create pid file \"%s\": %s",
			  server_opt.pid_file, strerror(errno));
	fprintf(fd, "ntkd %ld\n", (long) getpid());

	fclose(fd);
	pid_saved = 1;
}

/*
 * is_ntkd_already_running
 *
 * Returns 1 if there's already a ntkd running
 */
int
is_ntkd_already_running(void)
{
	pid_t oldpid;
	FILE *fd;

	if (!(fd = fopen(server_opt.pid_file, "r"))) {
		if (errno != ENOENT)
			error("Cannot read pid file \"%s\": %s",
				  server_opt.pid_file, strerror(errno));
		return 0;
	}

	fscanf(fd, "ntkd %d\n", &oldpid);
	if (ferror(fd)) {
		error("error reading pid file \"%s\": %s\n",
			  server_opt.pid_file, strerror(errno));
		fclose(fd);
		return 0;
	}
	fclose(fd);

	return !kill(oldpid, 0);
}

int
ntk_load_maps(void)
{
	if (file_exist(server_opt.int_map_file) &&
		(me.int_map = load_map(server_opt.int_map_file, &me.cur_node)))
		debug(DBG_NORMAL, "Internal map loaded");
	else
		me.int_map = init_map(0);

#if 0
	/* Don't load the bnode map, it's useless */
	if ((me.bnode_map = load_bmap(server_opt.bnode_map_file, me.ext_map,
								  FAMILY_LVLS, &me.bmap_nodes))) {
		debug(DBG_NORMAL, "Bnode map loaded");
	} else
#endif
		bmap_levels_init(BMAP_LEVELS(FAMILY_LVLS), &me.bnode_map,
						 &me.bmap_nodes);
	bmap_counter_init(BMAP_LEVELS(FAMILY_LVLS), &me.bmap_nodes_closed,
					  &me.bmap_nodes_opened);

	if (file_exist(server_opt.ext_map_file) &&
		(me.ext_map = load_extmap(server_opt.ext_map_file, &me.cur_quadg)))
		debug(DBG_NORMAL, "External map loaded");
	else
		me.ext_map = init_extmap(FAMILY_LVLS, 0);

	return 0;
}

int
ntk_save_maps(void)
{
	debug(DBG_NORMAL, "Saving the internal map");
	save_map(me.int_map, me.cur_node, server_opt.int_map_file);

#ifdef DEBUG
	debug(DBG_NORMAL, "Saving the border nodes map");
	save_bmap(me.bnode_map, me.bmap_nodes, me.ext_map, me.cur_quadg,
			  server_opt.bnode_map_file);
#endif

	debug(DBG_NORMAL, "Saving the external map");
	save_extmap(me.ext_map, MAXGROUPNODE, &me.cur_quadg,
				server_opt.ext_map_file);

	return 0;
}

int
ntk_free_maps(void)
{
	bmap_levels_free(me.bnode_map, me.bmap_nodes);
	bmap_counter_free(me.bmap_nodes_closed, me.bmap_nodes_opened);
	free_extmap(me.ext_map, FAMILY_LVLS, 0);
	free_map(me.int_map, 0);

	return 0;
}

void
usage(void)
{
	printf("Usage:\n"
		   "     ntkd [-hvaldrRD46] [-i net_interface] [-c conf_file] [-l logfile]\n\n"
		   " -4	ipv4\n"
		   " -6	ipv6\n"
		   " -i	Specify the interface after this\n\n"
		   " -a	Prevents running the ANDNA daemon\n"
		   " -R	Prevents editting /etc/resolv.conf\n"
		   " -D	Prevents running as daemon (Does not fork to the background)\n"
		   "\n"
		   " -r	Runs in restricted mode\n"
		   " -I	Share your internet connection with other nodes\n"
		   "\n"
		   " -c	configuration file\n"
		   " -l	Enables logging to file\n"
		   "\n"
		   " -d	Debug (Add more ds to get more info)\n"
		   " -h	Shows this help\n"
		   " -v	Shows the version you are using\n"
		   " -k     Kills the running instance of ntkd\n"
		   " -C	 Runs the console server for Ntk-Console to connect to\n"
		   " -e     Excludes an interface from usage I.E all interfaces except this one\n");
}

/*
 * fill_default_options: fills the default values in the server_opt struct
 */
void
fill_default_options(void)
{
	setzero(&server_opt, sizeof(server_opt));

	server_opt.family = AF_INET;

	server_opt.config_file = NTK_CONFIG_FILE;
	server_opt.pid_file = NTK_PID_FILE;

	server_opt.int_map_file = INT_MAP_FILE;
	server_opt.ext_map_file = EXT_MAP_FILE;
	server_opt.bnode_map_file = BNODE_MAP_FILE;

	server_opt.andna_hnames_file = ANDNA_HNAMES_FILE;
	server_opt.snsd_nodes_file = SNSD_NODES_FILE;
	server_opt.andna_cache_file = ANDNA_CACHE_FILE;
	server_opt.lclkey_file = LCLKEY_FILE;
	server_opt.lcl_file = LCL_FILE;
	server_opt.rhc_file = RHC_FILE;
	server_opt.counter_c_file = COUNTER_C_FILE;

	server_opt.daemon = 1;
	server_opt.dbg_lvl = 0;

	server_opt.disable_andna = 0;
	server_opt.disable_resolvconf = 0;
	server_opt.restricted = 0;
	server_opt.restricted_class = 0;

	server_opt.use_shared_inet = 1;

	server_opt.ip_masq_script = IPMASQ_SCRIPT_FILE;
	server_opt.tc_shaper_script = TCSHAPER_SCRIPT_FILE;

	server_opt.max_connections = MAX_CONNECTIONS;
	server_opt.max_accepts_per_host = MAX_ACCEPTS;
	server_opt.max_accepts_per_host_time = FREE_ACCEPT_TIME;
}

/*
 * fill_loaded_cfg_options
 *
 * stores in server_opt the options loaded from the configuration file
 */
void
fill_loaded_cfg_options(void)
{
	char *value;

	CONF_GET_STRN_VALUE(CONF_NTK_INT_MAP_FILE, &server_opt.int_map_file,
						NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_NTK_BNODE_MAP_FILE,
						&server_opt.bnode_map_file, NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_NTK_EXT_MAP_FILE, &server_opt.ext_map_file,
						NAME_MAX - 1);

	CONF_GET_STRN_VALUE(CONF_ANDNA_HNAMES_FILE,
						&server_opt.andna_hnames_file, NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_SNSD_NODES_FILE, &server_opt.snsd_nodes_file,
						NAME_MAX - 1);

	CONF_GET_STRN_VALUE(CONF_ANDNA_CACHE_FILE,
						&server_opt.andna_cache_file, NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_ANDNA_LCLKEY_FILE, &server_opt.lclkey_file,
						NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_ANDNA_LCL_FILE, &server_opt.lcl_file,
						NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_ANDNA_RHC_FILE, &server_opt.rhc_file,
						NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_ANDNA_COUNTER_C_FILE,
						&server_opt.counter_c_file, NAME_MAX - 1);

	CONF_GET_STRN_VALUE(CONF_NTK_PID_FILE, &server_opt.pid_file,
						NAME_MAX - 1);
	CONF_GET_INT_VALUE(CONF_NTK_MAX_CONNECTIONS,
					   server_opt.max_connections);
	CONF_GET_INT_VALUE(CONF_NTK_MAX_ACCEPTS_PER_HOST,
					   server_opt.max_accepts_per_host);
	CONF_GET_INT_VALUE(CONF_NTK_MAX_ACCEPTS_PER_HOST_TIME,
					   server_opt.max_accepts_per_host_time);

	CONF_GET_INT_VALUE(CONF_DISABLE_ANDNA, server_opt.disable_andna);
	CONF_GET_INT_VALUE(CONF_DISABLE_RESOLVCONF,
					   server_opt.disable_resolvconf);
	CONF_GET_INT_VALUE(CONF_NTK_RESTRICTED_MODE, server_opt.restricted);
	CONF_GET_INT_VALUE(CONF_NTK_RESTRICTED_CLASS,
					   server_opt.restricted_class);

	CONF_GET_INT_VALUE(CONF_NTK_INTERNET_CONNECTION,
					   server_opt.inet_connection);
	if ((value = CONF_GET_VALUE(CONF_NTK_INTERNET_GW))) {
		if (str_to_inet_gw(value, &server_opt.inet_gw,
						   &server_opt.inet_gw_dev))
			fatal
				("Malformed `%s' option: \"%s\". Its syntax is \"IP:dev\"",
				 config_str[CONF_NTK_INTERNET_GW], value);
	}
	CONF_GET_INT_VALUE(CONF_NTK_INTERNET_UPLOAD, server_opt.my_upload_bw);
	CONF_GET_INT_VALUE(CONF_NTK_INTERNET_DOWNLOAD,
					   server_opt.my_dnload_bw);
	if (server_opt.my_upload_bw && server_opt.my_dnload_bw)
		me.my_bandwidth =
			bandwidth_in_8bit((server_opt.my_upload_bw +
							   server_opt.my_dnload_bw) / 2);

	if ((value = CONF_GET_VALUE(CONF_NTK_INTERNET_PING_HOSTS))) {
		server_opt.inet_hosts = parse_internet_hosts(value,
													 &server_opt.
													 inet_hosts_counter);
		if (!server_opt.inet_hosts)
			fatal("Malformed `%s' option: \"%s\". "
				  "Its syntax is host1:host2:...",
				  config_str[CONF_NTK_INTERNET_PING_HOSTS], value);
	}
	CONF_GET_INT_VALUE(CONF_SHARE_INTERNET, server_opt.share_internet);
	CONF_GET_INT_VALUE(CONF_SHAPE_INTERNET, server_opt.shape_internet);
	CONF_GET_INT_VALUE(CONF_USE_SHARED_INET, server_opt.use_shared_inet);
	CONF_GET_STRN_VALUE(CONF_NTK_IP_MASQ_SCRIPT,
						&server_opt.ip_masq_script, NAME_MAX - 1);
	CONF_GET_STRN_VALUE(CONF_NTK_TC_SHAPER_SCRIPT,
						&server_opt.tc_shaper_script, NAME_MAX - 1);

	/* Clean the enviroment */
	clear_config_env();
}

void
free_server_opt(void)
{
	int i;

	if (server_opt.config_file != NTK_CONFIG_FILE)
		xfree(server_opt.config_file);
	if (server_opt.pid_file != NTK_PID_FILE)
		xfree(server_opt.pid_file);

	if (server_opt.int_map_file != INT_MAP_FILE)
		xfree(server_opt.int_map_file);
	if (server_opt.ext_map_file != EXT_MAP_FILE)
		xfree(server_opt.ext_map_file);
	if (server_opt.bnode_map_file != BNODE_MAP_FILE)
		xfree(server_opt.bnode_map_file);

	if (server_opt.andna_hnames_file != ANDNA_HNAMES_FILE)
		xfree(server_opt.andna_hnames_file);
	if (server_opt.snsd_nodes_file != SNSD_NODES_FILE)
		xfree(server_opt.snsd_nodes_file);
	if (server_opt.andna_cache_file != ANDNA_CACHE_FILE)
		xfree(server_opt.andna_cache_file);
	if (server_opt.lclkey_file != LCLKEY_FILE)
		xfree(server_opt.lclkey_file);
	if (server_opt.lcl_file != LCL_FILE)
		xfree(server_opt.lcl_file);
	if (server_opt.rhc_file != RHC_FILE)
		xfree(server_opt.rhc_file);
	if (server_opt.counter_c_file != COUNTER_C_FILE)
		xfree(server_opt.counter_c_file);

	if (server_opt.ip_masq_script != IPMASQ_SCRIPT_FILE)
		xfree(server_opt.ip_masq_script);
	if (server_opt.tc_shaper_script != TCSHAPER_SCRIPT_FILE)
		xfree(server_opt.tc_shaper_script);

	if (server_opt.inet_gw_dev)
		xfree(server_opt.inet_gw_dev);

	for (i = 0; i < MAX_INTERFACES && server_opt.ifs[i]; i++)
		xfree(server_opt.ifs[i]);
}

/* Removes specified existing interface, Ntkd should populate the device list
 * prior to this.
 * returns 0 on success, And closes ntkd on error.
*/

int
exclude_interface(void)
{
	int i;
        
	printf("Number of Interfaces in Use: %d\n", me.cur_ifs_n);
        
        for (i = 0; i < me.cur_ifs_n; i++)
            printf("Interface names in Use: %s", me.cur_ifs[i].dev_name);

	for (i = 0; i < me.cur_ifs_n; i++) {
		if (strcmp(me.cur_ifs[i].dev_name, optarg) == 0) {
			printf("Interface %s removed, And replaced with %s",
			me.cur_ifs[i].dev_name, me.cur_ifs[me.cur_ifs_n].dev_name);
                        ifs_del(me.cur_ifs, &me.cur_ifs_n, i);
                        return 0;
		}
                else
                    fatal("Interface %s not found!", optarg);
	}
}

void
ntk_thread_creatation(void)
{
	int x;
	pthread_t console_recv_send_thread;
	if (pthread_create
		(&console_recv_send_thread, NULL, &console_recv_send, &x)) {
		fprintf(stderr, "Error creating thread\n");
		exit(-1);
	}
}

void
parse_options(int argc, char **argv)
{
	int c, saved_argc = argc;
	optind = 0;

	while (1) {
		int option_index = 0;
		static struct option long_options[] = {
			{"help", 0, 0, 'h'},
			{"iface", 1, 0, 'i'},
			{"ipv6", 0, 0, '6'},
			{"ipv4", 0, 0, '4'},

			{"conf", 1, 0, 'c'},
			{"logfile", 1, 0, 'l'},

			{"no_andna", 0, 0, 'a'},
			{"no_daemon", 0, 0, 'D'},
			{"no_resolv", 0, 0, 'R'},

			{"restricted", 0, 0, 'r'},
			{"share-inet", 0, 0, 'I'},

			{"debug", 0, 0, 'd'},
			{"version", 0, 0, 'v'},
			{"kill", 0, 0, 'k'},
			{"exclude", 1, 0, 'e'},
			{"console", 0, 0, 'C'},
			{0, 0, 0, 0}
		};

		c = getopt_long(argc, argv, "i:c:l:e:hvd64DRrIakC", long_options,
						&option_index);
		if (c == -1)
			break;

		switch (c) {
		case 'C':
			ntk_thread_creatation();
			break;

		case 'v':
			printf("%s\n", VERSION_STR);
			exit(0);
			break;
		case 'e':
			exclude_interface();
			break;
		case 'k':
			if (is_ntkd_already_running() == 1) {
				char process_name[256] = { 0 };
				pid_t pid;
				printf("...Closing ntkd...\n");
				FILE *fd = fopen(server_opt.pid_file, "r");
				while (fscanf(fd, "%s %d", process_name, &pid) != EOF) {
					if (strcmp(process_name, "ntkd") == 0) {
						kill(pid, SIGINT);
					}
				}
				fclose(fd);
				exit(0);
			} else if (is_ntkd_already_running() == 0) {
				printf("ntkd is not running\n ...Exiting...\n");
				exit(0);
			}
			break;
		case 'h':
			usage();
			exit(0);
			break;
		case '4':
			server_opt.family = AF_INET;
			break;
		case '6':
#ifdef IPV6_DISABLED
			fatal("The ipv6 is still not supported");
#endif
			loginfo
				("WARNING: The ipv6 support is still experimental and under "
				 "development, nothing is assured to work.");
			server_opt.family = AF_INET6;
			break;
		case 'c':
			server_opt.config_file = xstrndup(optarg, NAME_MAX - 1);
			break;
		case 'l':
			if (log_to_file(optarg) < 0)
				fatal(0);
			break;
		case 'i':
			break;
		case 'D':
			server_opt.daemon = 0;
			break;
		case 'a':
			server_opt.disable_andna = 1;
			break;
		case 'R':
			server_opt.disable_resolvconf = 1;
			break;
		case 'r':
			server_opt.restricted = 1;

				/***
				 * This is a very dirty hack, but it handles
				 * the optional argument better than getopt.
				 *
				 * This is the problem:
				 * 	ntkd -abcrdefg
				 * If 'r' is an element that specifies an
				 * optional argument, then the "defg" string
				 * is taken as its arg, but this is not what
				 * we want because in this case '-r' is
				 * specified without its argument.
				 *
				 * So, what we do is checking if the argv
				 * next to the arg of 'r' begins with a '-'
				 * or not. If not, it is the option of '-r'
				 *
				 * The only thing that won't work is:
				 * 	ntkd -rOPTION
				 * it has to be specified in this way:
				 * 	ntkd -r OPTION
				 */
			if (argc > optind && argv[optind][0] != '-') {
				server_opt.restricted_class = atoi(argv[optind]);
				saved_argc--;
			}
			/**/ break;
		case 'I':
			server_opt.share_internet = 1;
			if (!server_opt.restricted) {
				loginfo("Share_internet=1. Assuming restricted=1");
				server_opt.restricted = 1;
			}
			if (!server_opt.inet_connection) {
				loginfo("Share_internet=1. Assuming inet_connection=1");
				server_opt.inet_connection = 1;
			}
			break;
		case 'd':
			server_opt.dbg_lvl++;
			break;
		default:
			usage();
			exit(1);
			break;
		}
	}

	if (optind < saved_argc && !options_parsed) {
		usage();
		exit(1);
	}

	options_parsed++;
}

void
check_conflicting_options(void)
{
#define FATAL_NOT_SPECIFIED(str) 	fatal("You didn't specified the `%s' " \
						"option in netsukuku.conf",    \
							(str));		       \

	if (!server_opt.pid_file)
		FATAL_NOT_SPECIFIED("pid_file");

	if (!server_opt.inet_hosts && server_opt.restricted)
		FATAL_NOT_SPECIFIED("internet_ping_hosts");


	if (server_opt.restricted && server_opt.share_internet &&
		!file_exist(server_opt.ip_masq_script))
		fatal("ip_masquerade_script \"%s\" is inexistent",
			  server_opt.ip_masq_script);

	if (server_opt.shape_internet &&
		!file_exist(server_opt.tc_shaper_script))
		fatal("tc_shaper_script \"%s\" is inexistent",
			  server_opt.ip_masq_script);

	if (!server_opt.restricted && server_opt.inet_connection)
		fatal("inet_connection=1 but ntk_restricted_mode=0. If you "
			  "want to be compatible with the Internet, "
			  "set the restricted mode in the options");

	if (!server_opt.restricted && (server_opt.share_internet))
		fatal("You want to share your Internet connection,"
			  "but I am not running in restricted mode (-r), "
			  "'cause I'm not sure of what you want... " "I'm aborting.");

	if (server_opt.share_internet && me.my_bandwidth < MIN_CONN_BANDWIDTH)
		fatal("You want to share your Internet connection but "
			  "your bandwidth is just TOO small. Do not share "
			  "it, or your connection will be saturated");

	if (!server_opt.inet_connection && server_opt.share_internet) {
		loginfo("You want to share your Internet connection,"
				"but `internet_connection' is set to 0."
				"We are assuming it is 1");
		server_opt.inet_connection = 1;
	}

	if (server_opt.shape_internet && !server_opt.inet_connection)
		fatal("The Internet traffic shaping option is set, but "
			  "the `internet_connection' is set to 0, please check "
			  "your options.");

#ifdef IPV6_DISABLED
	if (server_opt.inet_gw.family == AF_INET6)
		fatal("Ipv6 is not supported");
#endif
}

void
init_netsukuku(char **argv)
{
	xsrand();

	if (geteuid())
		fatal("Need root privileges");

	destroy_netsukuku_mutex = pid_saved = 0;
	sigterm_timestamp = sighup_timestamp = sigalrm_timestamp = 0;
	setzero(&me, sizeof(struct current_globals));

	if (is_ntkd_already_running())
		fatal("ntkd is already running. If it is not, remove \"%s\"",
			  server_opt.pid_file);
	else
		save_pid();

	my_family = server_opt.family;
	restricted_mode = server_opt.restricted;
	restricted_class =
		server_opt.restricted_class ? RESTRICTED_172 : RESTRICTED_10;

	/* Check if the DATA_DIR exists, if not create it */
	if (check_and_create_dir(DATA_DIR))
		fatal("Cannot access to the %s directory. Exiting.", DATA_DIR);

	/*
	 * Device initialization
	 */
	if (if_init_all(server_opt.ifs, server_opt.ifs_n,
					me.cur_ifs, &me.cur_ifs_n) < 0)
		fatal("Cannot initialize any network interfaces");

	/*
	 * ANDNA init
	 */
	if (!server_opt.disable_andna)
		andna_init();

	/*
	 * Initialize the Internet gateway stuff
	 */
	if (server_opt.my_upload_bw && server_opt.my_dnload_bw)
		me.my_bandwidth = bandwidth_in_8bit((server_opt.my_upload_bw +
											 server_opt.my_dnload_bw) / 2);
	init_internet_gateway_search();

	pkts_init(me.cur_ifs, me.cur_ifs_n, 0);
	qspn_init(FAMILY_LVLS);

	me.cur_erc = e_rnode_init(&me.cur_erc_counter);

	/* Radar init */
	rq_wait_idx_init(rq_wait_idx);
	first_init_radar();
	total_radars = 0;

	ntk_load_maps();

#if 0
	/* TODO: activate and test it !! */
	debug(DBG_NORMAL, "ACPT: Initializing the accept_tbl: \n"
		  "	max_connections: %d,\n"
		  "	max_accepts_per_host: %d,\n"
		  "	max_accept_per_host_time: %d",
		  server_opt.max_connections,
		  server_opt.max_accepts_per_host,
		  server_opt.max_accepts_per_host_time);
	init_accept_tbl(server_opt.max_connections,
					server_opt.max_accepts_per_host,
					server_opt.max_accepts_per_host_time);
#endif

	if (restricted_mode)
		loginfo("NetsukukuD is in restricted mode. "
				"Restricted class: %s",
				server_opt.
				restricted_class ? RESTRICTED_172_STR : RESTRICTED_10_STR);

	hook_init();
	rehook_init();

	me.uptime = time(0);
}

int
destroy_netsukuku(void)
{
	if (destroy_netsukuku_mutex)
		return -1;
	destroy_netsukuku_mutex = 1;

	unlink(server_opt.pid_file);

	ntk_save_maps();
	ntk_free_maps();
	if (!server_opt.disable_andna)
		andna_close();

	close_internet_gateway_search();
	last_close_radar();
	e_rnode_free(&me.cur_erc, &me.cur_erc_counter);
	destroy_accept_tbl();
	if_close_all();
	qspn_free();
	free_server_opt();

	return 0;
}

void
sigterm_handler(int sig)
{
	time_t cur_t;

	if (sigterm_timestamp == (cur_t = time(0)))
		return;
	sigterm_timestamp = time(0);

	if (!destroy_netsukuku())
		fatal("Termination signal caught. Dying, bye, bye");
}

void *
reload_hostname_thread(void *null)
{
	/*
	 * Reload the file where the hostnames to be registered are and
	 * register the new ones
	 */
	loginfo("Reloading the andna hostnames file");
	load_hostnames(server_opt.andna_hnames_file, &andna_lcl, &lcl_counter);
	load_snsd(server_opt.snsd_nodes_file, andna_lcl);
	andna_update_hnames(1);

	return 0;
}

void
sighup_handler(int sig)
{
	pthread_t thread;
	pthread_attr_t t_attr;

	time_t cur_t;

	if (sighup_timestamp == (cur_t = time(0)))
		return;
	sighup_timestamp = time(0);

	pthread_attr_init(&t_attr);
	pthread_attr_setdetachstate(&t_attr, PTHREAD_CREATE_DETACHED);
	pthread_create(&thread, &t_attr, reload_hostname_thread, 0);
}

void *
rh_cache_flush_thread(void *null)
{
	/*
	 * Flush the resolved hostnames cache.
	 */
	loginfo("Flush the resolved hostnames cache");
	rh_cache_flush();

	return 0;
}

void
sigalrm_handler(int sig)
{
	pthread_t thread;
	pthread_attr_t t_attr;

	time_t cur_t;

	if (sigalrm_timestamp == (cur_t = time(0)))
		return;
	sigalrm_timestamp = time(0);

	pthread_attr_init(&t_attr);
	pthread_attr_setdetachstate(&t_attr, PTHREAD_CREATE_DETACHED);
	pthread_create(&thread, &t_attr, rh_cache_flush_thread, 0);
}

/*
 * The main flow shall never be stopped, and the sand of time will be
 * revealed.
 */
int
main(int argc, char **argv)
{
	struct udp_daemon_argv ud_argv;
	u_short *port;
	pthread_t daemon_tcp_thread, daemon_udp_thread, andna_thread;
	pthread_t ping_igw_thread;
	pthread_attr_t t_attr;

	log_init(argv[0], 0, 1);

	/* Options loading... */
	fill_default_options();
	parse_options(argc, argv);

	/* reinit the logs using the new `dbg_lvl' value */
	log_init(argv[0], server_opt.dbg_lvl, 1);
	log_to_file(0);

	/* Load the option from the config file */
	load_config_file(server_opt.config_file);
	fill_loaded_cfg_options();

	/* If a same option was specified in the config file and in the
	 * command line, give priority to the latter */
	parse_options(argc, argv);

	check_conflicting_options();

	/* Initialize the whole netsukuku source code */
	init_netsukuku(argv);

	signal(SIGALRM, sigalrm_handler);
	signal(SIGHUP, sighup_handler);
	signal(SIGINT, sigterm_handler);
	signal(SIGTERM, sigterm_handler);
	signal(SIGQUIT, sigterm_handler);

	/* Angelic foreground or Daemonic background ? */
	if (server_opt.daemon) {
		loginfo("Forking to background");
		log_init(argv[0], server_opt.dbg_lvl, 0);
		if (daemon(0, 0) == -1)
			error("Impossible to daemonize: %s.", strerror(errno));

	}

	pthread_attr_init(&t_attr);
	pthread_attr_setdetachstate(&t_attr, PTHREAD_CREATE_DETACHED);
	setzero(&ud_argv, sizeof(struct udp_daemon_argv));
	port = xmalloc(sizeof(u_short));

	/*
	 * These are the daemons, the main threads that keeps NetsukukuD
	 * up & running.
	 */
	debug(DBG_NORMAL, "Activating all daemons");

	pthread_mutex_init(&udp_daemon_lock, 0);
	pthread_mutex_init(&tcp_daemon_lock, 0);

	debug(DBG_SOFT, "Evoking the netsukuku udp radar daemon.");
	ud_argv.port = ntk_udp_radar_port;
	pthread_mutex_lock(&udp_daemon_lock);
	pthread_create(&daemon_udp_thread, &t_attr, udp_daemon,
				   (void *) &ud_argv);
	pthread_mutex_lock(&udp_daemon_lock);
	pthread_mutex_unlock(&udp_daemon_lock);

	debug(DBG_SOFT, "Evoking the netsukuku tcp daemon.");
	*port = ntk_tcp_port;
	pthread_mutex_lock(&tcp_daemon_lock);
	pthread_create(&daemon_tcp_thread, &t_attr, tcp_daemon, (void *) port);
	pthread_mutex_lock(&tcp_daemon_lock);
	pthread_mutex_unlock(&tcp_daemon_lock);


	/* Now we hook in Netsukuku */
	netsukuku_hook(0, 0);

	/*
	 * If not disabled, start the ANDNA daemon
	 */
	if (!server_opt.disable_andna)
		pthread_create(&andna_thread, &t_attr, andna_main, 0);

	xfree(port);

	if (restricted_mode && (server_opt.share_internet ||
							server_opt.use_shared_inet)) {
		debug(DBG_SOFT, "Evoking the Internet Gateway Pinger daemon");
		pthread_create(&ping_igw_thread, &t_attr, igw_monitor_igws_t, 0);
	}

	/* We use this same process for the radar_daemon. */
	debug(DBG_SOFT, "Evoking radar daemon.");
	radar_daemon(0);

	/* Not reached, hahaha */
	loginfo("Cya m8");
	pthread_attr_destroy(&t_attr);
	destroy_netsukuku();

	exit(0);
}