/*
    protocol.h -- header for protocol.c
    Copyright (C) 1999-2005 Ivo Timmermans <ivo@tinc-vpn.org>,
                  2000-2005 Guus Sliepen <guus@tinc-vpn.org>

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: protocol.h 1439 2005-05-04 18:09:30Z guus $
*/

#ifndef __TINC_PROTOCOL_H__
#define __TINC_PROTOCOL_H__

/* Protocol version. Different versions are incompatible,
   incompatible version have different protocols.
 */

#define PROT_CURRENT 17

/* Silly Windows */

#ifdef ERROR
#undef ERROR
#endif

/* Request numbers */

typedef enum request_t {
	ALL = -1,					/* Guardian for allow_request */
	ID = 0, METAKEY, CHALLENGE, CHAL_REPLY, ACK,
	STATUS, ERROR, TERMREQ,
	PING, PONG,
	ADD_SUBNET, DEL_SUBNET,
	ADD_EDGE, DEL_EDGE,
	KEY_CHANGED, REQ_KEY, ANS_KEY,
	PACKET,
	LAST						/* Guardian for the highest request number */
} request_t;

typedef struct past_request_t {
	char *request;
	time_t firstseen;
} past_request_t;

extern bool tunnelserver;

/* Maximum size of strings in a request */

#define MAX_STRING_SIZE 2048
#define MAX_STRING "%2048s"

#include "edge.h"
#include "net.h"
#include "node.h"
#include "subnet.h"

/* Basic functions */

extern bool send_request(struct connection_t *, const char *, ...) __attribute__ ((__format__(printf, 2, 3)));
extern void forward_request(struct connection_t *);
extern bool receive_request(struct connection_t *);
extern bool check_id(const char *);

extern void init_requests(void);
extern void exit_requests(void);
extern bool seen_request(char *);
extern void age_past_requests(void);

/* Requests */

extern bool send_id(struct connection_t *);
extern bool send_metakey(struct connection_t *);
extern bool send_challenge(struct connection_t *);
extern bool send_chal_reply(struct connection_t *);
extern bool send_ack(struct connection_t *);
extern bool send_status(struct connection_t *, int, const char *);
extern bool send_error(struct connection_t *, int,const  char *);
extern bool send_termreq(struct connection_t *);
extern bool send_ping(struct connection_t *);
extern bool send_pong(struct connection_t *);
extern bool send_add_subnet(struct connection_t *, const struct subnet_t *);
extern bool send_del_subnet(struct connection_t *, const struct subnet_t *);
extern bool send_add_edge(struct connection_t *, const struct edge_t *);
extern bool send_del_edge(struct connection_t *, const struct edge_t *);
extern bool send_key_changed(struct connection_t *, const struct node_t *);
extern bool send_req_key(struct connection_t *, const struct node_t *, const struct node_t *);
extern bool send_ans_key(struct connection_t *, const struct node_t *, const struct node_t *);
extern bool send_tcppacket(struct connection_t *, struct vpn_packet_t *);

/* Request handlers  */

extern bool id_h(struct connection_t *);
extern bool metakey_h(struct connection_t *);
extern bool challenge_h(struct connection_t *);
extern bool chal_reply_h(struct connection_t *);
extern bool ack_h(struct connection_t *);
extern bool status_h(struct connection_t *);
extern bool error_h(struct connection_t *);
extern bool termreq_h(struct connection_t *);
extern bool ping_h(struct connection_t *);
extern bool pong_h(struct connection_t *);
extern bool add_subnet_h(struct connection_t *);
extern bool del_subnet_h(struct connection_t *);
extern bool add_edge_h(struct connection_t *);
extern bool del_edge_h(struct connection_t *);
extern bool key_changed_h(struct connection_t *);
extern bool req_key_h(struct connection_t *);
extern bool ans_key_h(struct connection_t *);
extern bool tcppacket_h(struct connection_t *);

#endif							/* __TINC_PROTOCOL_H__ */