/* main.c - init
 *
 * Copyright (C) 2007 Borislav Sapundzhiev
 *
 * 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 2 of the License, or (at
 * your option) any later version.
 *
 */

#include "calipso.h"
#ifdef USE_SSL
#include "cpo_io_ssl.h"
#endif

#ifdef _WIN32
#include "getopt.h"
#define CALIPSO_DEFAULT_CONFIG "calipso.conf"
#else
#define CALIPSO_DEFAULT_CONFIG "../doc/calipso.conf"
#endif

#define CALIPSO_PID_FILE	"/var/run/calipso.pid"

static void usage(int);
static void calipso_suppress_stdio(void);
static int calipso_setup_server_user(const char *user);
static int calipso_write_pidfile(pid_t pid);
static void print_info();

int main(int argc, char **argv)
{
    int opt, i;
    /*load all modules true by default*/
    int load_mod_flag = 1;
    int deamonize = 0;
    int check_config = 0;
    int show_info = 0;
    const char *configfile = CALIPSO_DEFAULT_CONFIG;
    calipso_config_t *config = NULL;
    const char * user = NULL;

    while ((opt = getopt(argc, argv, "f:dMCSlhvi?")) != -1) {

        switch (opt) {
        case 'c':
        case 'f':
            configfile = optarg;
            break;
        case 'd':
            fprintf(stderr, "starting calipso httpd...");
            deamonize = 1;
            break;
        case 'M':
            fprintf(stderr, "loaded modules:\n");
            load_mod_flag = 0;
            break;
        case 'v':
            usage(1);
            break;
        case 'C':
            check_config = 1;
            break;
        case 'S':
            calipso_suppress_stdio();
            break;
        case 'i':
            show_info = 1;
            break;
        case 'h':
        case '?':
        default:
            usage(0);
        }
    }

    /* init server */
    calipso_init();
#ifdef USE_SSL
    calipso_ssl_init();
#endif
    /* init coniguration */
    config = calipso_config_alloc();
    config_parse_file(config, configfile);

    if (check_config) {
        config_list_dump(config);
        exit(0);
    }

    calipso_set_config(config);

    /* init signal handlers */
    calipso_init_all_signal_handlers();

    /* loading modules */
    calipso_modules_init(config, load_mod_flag);
    /* debug hooks */
    if (show_info) {
        print_info();
        for (i = 0; i < NR_HOOKS; i++)
            calipso_hook_dump(i);
        calipso_destroy();
        exit(0);
    }

    /* HOOKS init all modules */
    calipso_trigger_hook(HOOK_INIT);
    calipso_trigger_hook(HOOK_CONFIGURE);

    if (deamonize) {

        if (daemon(0, 1) < 0) {
            TRACE("daemon() call failure.");
            exit(EXIT_FAILURE);
        } else {
            calipso_write_pidfile(getpid());
        }

        calipso_suppress_stdio();
    }

    user = config_get_option(config, "user", NULL);
    if (user) {
        calipso_setup_server_user(user);
    }

    /* init events */
    cpo_events_init();
    /* config should not be used anymore*/
    config_unalloc(calipso->config);
    calipso->config = NULL;
    /* main loop */
    cpo_events_loop();

    return 0;
}

void calipso_suppress_stdio()
{
    /* close stdin and stdout, as they are not needed */
    /* move stdin to /dev/null */
    int fd;
    if (-1 != (fd = open(DEVNULL, O_RDONLY))) {
        close(STDIN_FILENO);
        dup2(fd, STDIN_FILENO);
        close(fd);
    }

    /* move stdout to /dev/null */
    if (-1 != (fd = open(DEVNULL, O_WRONLY))) {
        close(STDOUT_FILENO);
        dup2(fd, STDOUT_FILENO);
        close(fd);
    }

    fflush(stdin);
    fflush(stdout);
}

int calipso_setup_server_user(const char *user)
{
#ifndef _WIN32
    struct passwd *pw;
    /*
     * XXX: Valgrind shows memory leak on getpwnam
     */
    pw = getpwnam(user);
    if (pw == NULL) {
        printf("Error: Unknown username '%s'\n", user);
        exit(EXIT_FAILURE);
    }

    if (setuid(pw->pw_uid) != 0) {
        perror("setuid()");
        if (EPERM == errno) {
            printf("continue with current uid %d\n", getuid());
        } else
            exit(EXIT_FAILURE);
    } else {
        printf("server sarted as user: %s UID: %d == %d (getuid %d)\n",
               pw->pw_name, pw->pw_uid, geteuid(), getuid());
    }
#endif
    return CPO_OK;
}

int calipso_write_pidfile(pid_t pid)
{
    FILE *fp = fopen(CALIPSO_PID_FILE, "w+");
    if (fp) {
        fprintf(fp, "%d", pid);
        fclose(fp);
        return CPO_OK;
    }

    return CPO_ERR;
}

static void print_info()
{
    printf("CALIPSO_DEFAULT_POOLSIZE %d\n", CALIPSO_DEFAULT_POOLSIZE);
    printf("INPUTBUFSZ: %d pagesize %d\n", INPUTBUFSZ, getpagesize());
    printf("listener hash table(size= %d buckets)...\n",
           (int)hash_table_get_size(calipso->listeners));
    printf("m_handler hash table(size= %d buckets)...\n",
           (int)hash_table_get_size(calipso->m_handler));
    printf("calipso hooks = %d \n", calipso_hook_get_NR_HOOKS());
}

void usage(int version)
{
    if (version) {
        printf("Calipso - lightweight http server (%s, Ver:%s, Date:%s)\n", OS,
               VERSION, __DATE__);
        printf(
            "Autor: (c) 2007,2013 Borislav Sapundzhiev <BSapundjiev@gmail.com>\n");
        printf(
            "License:This program is released under the terms of the GPLv2\n\n");
        exit(EXIT_FAILURE);
    }

    printf("\nUsage:\tcalipso [-f <file> -CMdHSh]\n");
    printf("\nOptions:\n"
           "\t-f <config> - configuration file\n"
           "\t-C - check config file for errors\n"
           "\t-M - list loaded modules\n"
           "\t-d - service mode (deamon)\n"
           "\t-i - show core values and\n"
           "\t-S - disable console output\n"
           "\t-v - version\n"
           "\t-h - this page\n"
           "\n");

    exit(EXIT_FAILURE);
}