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/* ============================================================================
* << File: protocol.h >>
* -------------------------
* Authors: Emiliano Castagnari (aka Torian) <ecastag@fi.uba.ar>
* Diego Essaya <dessaya@fi.uba.ar>
* Date: 31/12/03
* ============================================================================
* ============================================================================
*
* ChangeLog: View Changelog
*
* ============================================================================
* Copyright (C) 2003, 2004 Diego Essaya, Emiliano Castagnari
*
* This file is part of gems.
*
* gems 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.
*
* gems 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 Library 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.
* ============================================================================
*/
#ifndef _PROTOCOL_H_
#define _PROTOCOL_H_
#include "common.h"
/* Socket input/output buffer size: */
#define BUFSIZE 1024
/* TCP ports: */
#define DEFAULT_TCP_PORT 6666
#define PORT_MIN 1024
#define PORT_MAX 65535
/* Port range verification
* Ports lower than PORT_MIN are reserved by IANA */
#define port_range(p) ((p >= PORT_MIN) && (p <= PORT_MAX))
/* Message field sizes, in bytes: */
#define MSG_TYPE_SIZE 1
#define MSG_DATA_LEN_SIZE sizeof(int) /* should be 4 */
#define MSG_MAX_DATA_SIZE 1024
/* Message header total size: */
#define MSG_HEADER_SIZE ((MSG_TYPE_SIZE) + (MSG_DATA_LEN_SIZE))
/* Types of messages, and their respective codes: */
typedef char gems_msg_type_t;
#define GEMS_DATA ((gems_msg_type_t)0x00)
#define GEMS_WINSIZE ((gems_msg_type_t)0x01)
#define GEMS_VERSION ((gems_msg_type_t)0x02)
#define GEMS_ACK ((gems_msg_type_t)0x03)
#define GEMS_DISCONNECT ((gems_msg_type_t)0x04)
/* The size of message data is stored in an int (4 bytes): */
typedef unsigned int gems_msg_len_t;
/* Message structure: */
typedef struct
{
gems_msg_type_t type;
gems_msg_len_t len;
char *data;
}
t_gems_msg;
/* I/O buffers, declared here to be used in other modules: */
extern char gems_msg_buffer[];
extern char *gems_header_buffer;
extern char *gems_data_buffer;
fbool_t get_stream(int fd, char *buffer, int bytes);
fbool_t get_msg(int fd, t_gems_msg * msg);
fbool_t send_msg(int fd, t_gems_msg * msg);
fbool_t send_version(int fd);
fbool_t get_peer_version(int fd, char **version);
fbool_t send_ack(int fd);
fbool_t get_ack(int fd);
fbool_t send_disconnect(int fd);
fbool_t send_winsize(int fd);
fbool_t compare_winsize(int remote_cols, int remote_rows, char *appname);
fbool_t get_cols_rows(const t_gems_msg * msg, int *cols, int *rows);
fbool_t get_winsize(int fd, int *cols, int *rows);
#endif
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