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/*
** Copyright (C) 2006 Olivier DEMBOUR
** $Id: server.c,v 1.20.4.1 2010/01/06 12:50:40 dembour Exp $
**
**
** 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.
**
** 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, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <sys/select.h>
#include <sys/time.h>
#include <time.h>
#include <string.h>
#include "server.h"
#include "dns.h"
#include "list.h"
#include "myerror.h"
#include "requests.h"
#include "queue.h"
#include "debug.h"
#include "log.h"
#define SOCKET_TIMEOUT 0 /* 1s */
#define SOCKET_UTIMEOUT 500000 /* 1s */
/**
* @brief prepare the fd_set for select
* @param[in] conf configuration
* @param[in] rfds the fd_set
* @param[in] tv timeval structure
* @retval last file descriptor
*/
static int prepare_select(t_conf *conf, fd_set *rfds, struct timeval *tv)
{
int max_fd = 0;
t_simple_list *client;
FD_ZERO(rfds);
client = conf->client;
while (client)
{
if ((client->sd_tcp != -1) && (!(client->control.queue_full)))
{
FD_SET(client->sd_tcp, rfds);
max_fd = MAX(max_fd, client->sd_tcp);
}
client = client->next;
}
FD_SET(conf->sd_udp, rfds);
if (conf->foreground)
FD_SET(0, rfds);
max_fd = MAX(max_fd, conf->sd_udp);
tv->tv_sec = SOCKET_TIMEOUT;
tv->tv_usec = SOCKET_UTIMEOUT;
return (max_fd);
}
/**
* @brief delete a client
* @param[in] conf configuration
* @param[in] client client to delete
**/
int delete_client(t_conf *conf, t_simple_list *client)
{
t_simple_list *tmp;
if (conf->client == client)
{
tmp = client->next;
LOG("delete_client 0x%x %s\n", client->session_id,
client->control.authenticated ? "" : "(not authenticated)");
delete_queue(client->saved_queue);
list_destroy_simple_cell(conf->client);
conf->client = tmp;
return (0);
}
for (tmp = conf->client; tmp; tmp = tmp->next)
{
if (tmp->next == client)
{
tmp->next = client->next;
LOG("delete_client 0x%x\n", client->session_id);
delete_queue(client->saved_queue);
return (list_destroy_simple_cell(client));
}
}
return (-1);
}
/**
* @brief destroy dead client
* @param[in] conf configuration
**/
// Warning Zombie ahead
void delete_zombie(t_conf *conf)
{
t_simple_list *client;
t_simple_list *tmp;
struct timeval tv;
struct timezone tz;
if (!(gettimeofday(&tv, &tz)))
for (client = conf->client; client; client = tmp)
{
tmp = client->next;
if (tv.tv_sec > client->control.tv.tv_sec)
{
if (client->sd_tcp != -1)
close(client->sd_tcp);
delete_client(conf, client);
}
}
}
#define MINI_BUFF 64
/**
* @brief main loop
* @param[in] conf configuration
**/
int do_server(t_conf *conf)
{
fd_set rfds;
int retval;
int max_fd;
t_simple_list *client;
t_simple_list *tmp;
struct timeval tv;
struct timezone tz;
#ifdef DEBUG
char buffer[MINI_BUFF];
#endif
while (1)
{
max_fd = prepare_select(conf, &rfds, &tv);
retval = select(max_fd + 1 , &rfds, NULL, NULL, &tv);
queue_flush_expired_data(conf);
if (retval == -1)
{
perror("");
MYERROR("select");
return (-1);
}
if (!retval)
{
if (gettimeofday(&tv, &tz))
{
MYERROR("Time Error");
return (-1);
}
delete_zombie(conf);
continue;
}
#ifdef DEBUG
if ((conf->foreground) && (FD_ISSET(0, &rfds)))
{
read(0, buffer, MINI_BUFF);
queue_dump(conf->client);
continue;
}
#endif
if (FD_ISSET(conf->sd_udp, &rfds))
get_incoming_request(conf);
else
{
for (client = conf->client; client; client = tmp)
{
tmp = client->next;
if ((client->sd_tcp != -1) && (FD_ISSET(client->sd_tcp, &rfds)))
{
if (queue_read_tcp(conf, client))
{
if (client->sd_tcp != -1)
close(client->sd_tcp);
delete_client(conf, client);
}
}
}
}
delete_zombie(conf);
}
}
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