/* UNIX RFCNB (RFC1001/RFC1002) NetBIOS implementation
 * 
 * Version 1.0
 * RFCNB Defines
 * 
 * Copyright (C) Richard Sharpe 1996
 * 
 */

/*
 * 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.
 */

/* Defines we need */


#define GLOBAL extern

#include "rfcnb-error.h"
#include "rfcnb-common.h"
#include "byteorder.h"

#ifdef RFCNB_PORT
#define RFCNB_Default_Port RFCNB_PORT
#else
#define RFCNB_Default_Port 139
#endif

#define RFCNB_MAX_STATS 1

/* Protocol defines we need */

#define RFCNB_SESSION_MESSAGE 0
#define RFCNB_SESSION_REQUEST 0x81
#define RFCNB_SESSION_ACK 0x82
#define RFCNB_SESSION_REJ 0x83
#define RFCNB_SESSION_RETARGET 0x84
#define RFCNB_SESSION_KEEP_ALIVE 0x85

/* Structures      */

typedef struct redirect_addr *redirect_ptr;

struct redirect_addr {

    struct in_addr ip_addr;
    int port;
    redirect_ptr next;

};

typedef struct RFCNB_Con {

    int fd;			/* File descripter for TCP/IP connection */
    int rfc_errno;		/* last error                            */
    int timeout;		/* How many milli-secs before IO times out */
    int redirects;		/* How many times we were redirected     */
    struct redirect_addr *redirect_list;	/* First is first address */
    struct redirect_addr *last_addr;

} RFCNB_Con;

typedef char RFCNB_Hdr[4];	/* The header is 4 bytes long with  */
				    /* char[0] as the type, char[1] the */
				    /* flags, and char[2..3] the length */

/* Macros to extract things from the header. These are for portability
 * between architecture types where we are worried about byte order     */

#define RFCNB_Pkt_Hdr_Len        4
#define RFCNB_Pkt_Sess_Len       72
#define RFCNB_Pkt_Retarg_Len     10
#define RFCNB_Pkt_Nack_Len       5
#define RFCNB_Pkt_Type_Offset    0
#define RFCNB_Pkt_Flags_Offset   1
#define RFCNB_Pkt_Len_Offset     2	/* Length is 2 bytes plus a flag bit */
#define RFCNB_Pkt_N1Len_Offset   4
#define RFCNB_Pkt_Called_Offset  5
#define RFCNB_Pkt_N2Len_Offset   38
#define RFCNB_Pkt_Calling_Offset 39
#define RFCNB_Pkt_Error_Offset   4
#define RFCNB_Pkt_IP_Offset      4
#define RFCNB_Pkt_Port_Offset    8

/* The next macro isolates the length of a packet, including the bit in the
 * flags                                                                   */

#define RFCNB_Pkt_Len(p)  (PVAL(p, 3) | (PVAL(p, 2) << 8) |     \
                          ((PVAL(p, RFCNB_Pkt_Flags_Offset) & 0x01) << 16))

#define RFCNB_Put_Pkt_Len(p, v) (p[1] = ((v >> 16) & 1)); \
				(p[2] = ((v >> 8) & 0xFF)); \
				(p[3] = (v & 0xFF));

#define RFCNB_Pkt_Type(p) (CVAL(p, RFCNB_Pkt_Type_Offset))

/*typedef struct RFCNB_Hdr {
 * 
 * unsigned char type;
 * unsigned char flags;
 * int16 len;
 * 
 * } RFCNB_Hdr;
 * 
 * typedef struct RFCNB_Sess_Pkt {
 * unsigned char type;
 * unsigned char flags;
 * int16 length;
 * unsigned char n1_len;
 * char called_name[33];
 * unsigned char n2_len;
 * char calling_name[33];
 * } RFCNB_Sess_Pkt;
 * 
 * 
 * typedef struct RFCNB_Nack_Pkt {
 * 
 * struct RFCNB_Hdr hdr;
 * unsigned char error;
 * 
 * } RFCNB_Nack_Pkt;
 * 
 * typedef struct RFCNB_Retarget_Pkt {
 * 
 * struct RFCNB_Hdr hdr;
 * int dest_ip;
 * unsigned char port;
 * 
 * } RFCNB_Redir_Pkt; */

/* Static variables */

/* Only declare this if not defined */

#ifndef RFCNB_ERRNO
extern int RFCNB_errno;
extern int RFCNB_saved_errno;	/* Save this from point of error */
#endif
