// ndppd - NDP Proxy Daemon
// Copyright (C) 2011  Daniel Adolfsson <daniel@priv.nu>
//
// This program 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 3 of the License, or
// (at your option) any later version.
//
// This program 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.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
#include <iostream>
#include <fstream>
#include <string>

#include <getopt.h>
#include <sys/time.h>

#include <sys/types.h>
#include <unistd.h>

#include "ndppd.h"

using namespace ndppd;

int daemonize()
{
    pid_t pid = fork();

    if (pid < 0)
        return -1;

    if (pid > 0)
        exit(0);

    pid_t sid = setsid();

    if (sid < 0)
        return -1;

    close(STDIN_FILENO);
    close(STDOUT_FILENO);
    close(STDERR_FILENO);

    return 0;
}

int main(int argc, char *argv[], char *env[])
{
    std::string config_path("/etc/ndppd.conf");
    std::string pidfile;
    bool daemon = false;

    while (1) {
        int c, opt;

        static struct option long_options[] =
        {
            { "config", 1, 0, 'c' },
            { "daemon", 0, 0, 'd' },
            { 0, 0, 0, 0}
        };

        c = getopt_long(argc, argv, "c:dp:", long_options, &opt);

        if (c == -1)
            break;

        switch (c) {
        case 'c':
            config_path = optarg;
            break;

        case 'd':
            daemon = true;
            break;

        case 'p':
            pidfile = optarg;
            break;
        }
    }

    if (daemon) {
        log::syslog(true);

        if (daemonize() < 0) {
            ERR("Failed to daemonize process");
            return 1;
        }
    }

    if (!pidfile.empty()) {
        std::ofstream pf;
        pf.open(pidfile.c_str(), std::ios::out | std::ios::trunc);
        pf << getpid() << std::endl;
        pf.close();
    }

    NFO("ndppd (NDP Proxy Daemon) version " NDPPD_VERSION);

    NFO("Using configuration file '%s'", config_path.c_str());

    if (!conf::load(config_path))
        return -1;

    struct timeval t1, t2;

    gettimeofday(&t1, 0);

    while (iface::poll_all() >= 0) {
        int elapsed_time;
        gettimeofday(&t2, 0);

        elapsed_time =
            ((t2.tv_sec  - t1.tv_sec)  * 1000) +
            ((t2.tv_usec - t1.tv_usec) / 1000);

        t1.tv_sec  = t2.tv_sec;
        t1.tv_usec = t2.tv_usec;

        session::update_all(elapsed_time);
    }

    ERR("iface::poll_all() failed");

    return 0;
}