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/*
** Copyright (C) 2006 Olivier DEMBOUR
** $Id: session.c,v 1.5.4.3 2010/06/02 14:38:23 collignon 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 <string.h>
#include "mycrypto.h"
#include "client.h"
#include "myerror.h"
#include "requests.h"
#include "debug.h"
#include "rr.h"
#include "myrand.h"
#include "session.h"
/**
* @brief ask for a challenge
* @param[in] conf configuration
* @param[in] request request to use
* @param[out] buffer packet received
* @retval session id
**/
uint16_t request_challenge(t_conf *conf, t_request *request, char *buffer)
{
t_packet *packet;
int len;
DPRINTF(2, "Request challenge\n");
if ((len = transceive_query(conf, request, buffer, MAX_DNS_LEN )) == -1)
return (0);
packet = (t_packet *)buffer;
if (packet->type != OK)
return (0);
buffer[len] = 0;
DPRINTF(2,"Challenge = \'%s\'\n", (char *)(packet+1));
DPRINTF(1,"Session created (0x%x)\n", packet->session_id);
return (packet->session_id); /* Not my challenge */
}
/**
* @brief send the challenge response
* @param[in] conf configuration
* @param[out] request where to create the request
* @param[in] challenge challenge
* @retval 0 on success
* @retval -1 on error
**/
uint8_t send_response(t_conf *conf, t_request *request, char *challenge)
{
char buffer[MAX_DNS_LEN + 1];
t_packet *packet;
int len;
packet = (t_packet *) &(request->u.packet);
request->len = sign_challenge(challenge, CHALLENGE_SIZE, conf->key, (char *)(packet+1),
MAX_DNS_LEN - sizeof(t_packet)) + PACKET_LEN;
DPRINTF(2, "Sending response : '%s' (key = %s) \n", (char *)(packet+1), conf->key)
if ((len = transceive_query(conf, request, buffer, sizeof(buffer) -1)) == -1)
return (-1);
packet = (t_packet *) &buffer;
if (packet->type == OK)
return (0);
return (-1);
}
/**
* @brief try to open a session
* @param[in] conf configuration
* @retval 0 on error
* @retval session id
**/
uint16_t create_session(t_conf *conf)
{
char domain[MAX_DNS_LEN + 1];
t_request request;
t_packet *packet;
uint16_t session_id;
char challenge[MAX_DNS_LEN + 1];
if ((strlen(conf->domain) + sizeof(AUTH)) > MAX_DNS_LEN)
return (0);
strcpy(domain, AUTH);
strcat(domain, conf->domain);
request.domain = (char *)&domain;
request.type = conf->query_functions->type;
request.request_functions = conf->query_functions;
request.len = PACKET_LEN;
packet = &(request.u.packet);
packet->session_id = 0;
packet->ack_seq = 0;
packet->type = 0;
packet->seq = myrand();
if (!conf->disable_compression)
packet->type |= USE_COMPRESS;
if (!(session_id = request_challenge(conf, &request, (char *)&challenge)))
return (0);
packet->session_id = session_id;
if (send_response(conf, &request, &challenge[PACKET_LEN]))
{
fprintf(stderr, "Authentication failed\n");
return (0);
}
return (session_id);
}
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