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/*
** Copyright (C) 2006 Olivier DEMBOUR
** $Id: options.c,v 1.18.4.1 2009/12/03 16:28:37 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 <strings.h>
#include <string.h>
#include <stdlib.h>
#include "server.h"
#include "dns.h"
#include "list.h"
#include "my_config.h"
#include "debug.h"
#include "log.h"
/**
* @brief Usage
* @param[in] program name
**/
static void usage(char *name)
{
fprintf(stderr, "Usage : %s [ -i IP ] [ -F ] [ -d debug_level ] [ -f config-file ] [ -p pidfile ]\n", name);
fprintf(stderr, "\t -F : dns2tcpd will run in foreground\n");
}
/**
* @brief check for missing parameters
* @param[in] conf configuration
* @retval 0 on success
* @retval -1 on error
**/
static int check_mandatory_param(t_conf *conf)
{
if (!conf->port)
conf->port = 53;
if (!conf->resources)
{
LOG("Need at least one resource \n");
return (-1);
}
if (!conf->my_domain)
{
LOG("Need a domain name\n");
return (-1);
}
return (0);
}
/**
* @brief add a ressource
* @param[in] conf configuration
* @param[in] value ressource to add
* @retval 0 on success
* @retval -1 on error
**/
static int add_resource(t_conf *conf, char *value)
{
t_list *cell;
char *port;
if (!(port = strrchr(value, ':')))
return (-1);
*port++ = 0;
if (!strchr(value, ':'))
return (-1);
if (!(cell = list_create_cell()))
return (-1);
if (!conf->resources)
conf->resources = cell;
else
list_add_cell(conf->resources, cell);
strncpy(cell->data, value, MAX_DNS_LEN-1);
cell->info.port = atoi(port);
DPRINTF(1, "Add resource %s port %d\n", value, cell->info.port);
free(value);
return (0);
}
/**
* @brief copy a parameter into conf structure
* @param[in] conf configuration
* @param[in] token parameter
* @param[in] value value
* @retval 0 on success
* @retval -1 on error
**/
static int server_copy_param(void *my_conf, char *token, char *value)
{
char *buffer = 0;
t_conf *conf;
conf = (t_conf *)my_conf;
if (token)
{
/* Integer value */
if (!strcmp(token, "debug_level"))
return (debug ? 0 : (debug = atoi(value)));
if (!strcmp(token, "port"))
return (conf->port = atoi(value));
if (!(buffer = strdup(value)))
{
LOG("Memory error\n");
exit (-1);
}
/* String value */
if (!strcmp(token, "chroot"))
return ((conf->chroot = buffer) > 0);
if (!strcmp(token, "key"))
return ((conf->key = buffer) > 0);
if (!strcmp(token, "user"))
return ((conf->user = buffer) > 0);
if (!strcmp(token, "domain"))
return ((conf->my_domain = buffer) > 0);
if (!strcmp(token, "pid_file"))
return ((conf->pid_file = buffer) > 0);
if (!strcmp(token, "listen"))
return ((conf->my_ip ? 0 : (conf->my_ip = buffer) > 0));
if (!strcmp(token, "resources"))
return (add_resource(conf, buffer));
if (!strcmp(token, "ressources"))
{
fprintf(stderr, "Warning : Incorrect resources syntax in config file (should be resources)\n");
return (add_resource(conf, buffer));
}
}
if (buffer)
free(buffer);
return (-1);
}
/**
* @brief get options for command line and file configuration
* @param[in] argc number command line arguments
* @param[in] argv command line arguments
* @param[in] conf configuration
* @retval 0 on success
* @retval -1 on error
**/
int get_option(int argc, char **argv, t_conf *conf)
{
int c;
char config_file[CONFIG_FILE_LEN];
bzero(conf, sizeof(t_conf));
config_file[0] = 0;
debug = 0;
while (1)
{
c = getopt (argc, argv, "hFf:i:d:p:");
if (c == -1)
break;
switch (c) {
case 'f':
if (strlen(optarg) > (CONFIG_FILE_LEN - 10))
return (-1);
strncpy(config_file, optarg, CONFIG_FILE_LEN-1);
break;
case 'd':
debug = atoi(optarg);
break;
case 'F':
conf->foreground = 1;
break;
case 'i':
conf->my_ip = optarg;
break;
case 'p':
conf->pidfile = optarg;
break;
case 'h':
default :
usage(argv[0]);
return(-1);
}
}
read_config(config_file, conf, server_copy_param, ".dns2tcpdrc");
if (check_mandatory_param(conf) == -1)
{
usage(argv[0]);
return (-1);
}
return (0);
}
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