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120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/*
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* OpenMODBUS/TCP to RS-232/485 MODBUS RTU gateway
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*
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* conn.h - connections management procedures
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*
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* Copyright (c) 2002-2003, 2013, Victor Antonovich (v.antonovich@gmail.com)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: conn.h,v 1.3 2015/02/25 10:33:57 kapyar Exp $
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*/
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#ifndef _CONN_H
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#define _CONN_H
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#include "globals.h"
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#include "cfg.h"
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#include "sock.h"
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#include "modbus.h"
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#include "sig.h"
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#ifdef LOG
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#include "log.h"
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#endif
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/*
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* Default values
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*/
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#define DEFAULT_SERVERADDR "0.0.0.0"
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#define DEFAULT_SERVERPORT 502
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#define DEFAULT_MAXCONN 32
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#define DEFAULT_MAXTRY 3
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#define DEFAULT_RQSTPAUSE 100
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#define DEFAULT_RESPWAIT 500
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#define DEFAULT_CONNTIMEOUT 60
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/* Max simultaneous TCP connections to server */
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#ifndef MAX_MAXCONN
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# define MAX_MAXCONN 128
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#endif
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/* Max RTU device request retries */
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#ifndef MAX_MAXTRY
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# define MAX_MAXTRY 15
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#endif
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/* Max RTU device pause between requests, in msecs */
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#ifndef MAX_RQSTPAUSE
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# define MAX_RQSTPAUSE 10000
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#endif
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/* Max RTU device response wait, in msecs */
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#ifndef MAX_RESPWAIT
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# define MAX_RESPWAIT 10000
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#endif
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/* Max connection timeout, in secs */
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#ifndef MAX_CONNTIMEOUT
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# define MAX_CONNTIMEOUT 1000
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#endif
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#define CRCSIZE 2 /* size (in bytes) of CRC */
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#define HDRSIZE 6 /* size (in bytes) of header */
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#define BUFSIZE 256 /* size (in bytes) of MODBUS data */
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#define RQSTSIZE (HDRSIZE + BUFSIZE - 2) /* size (in bytes) of MODBUS request */
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/*
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* Client connection FSM states
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*/
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#define CONN_HEADER 0 /* reading frame header */
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#define CONN_RQST_FUNC 1 /* reading request function code */
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#define CONN_RQST_NVAL 2 /* reading request number of values (registers/coils) */
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#define CONN_RQST_TAIL 3 /* reading request tail */
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#define CONN_TTY 4 /* writing request to TTY */
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#define CONN_RESP 5 /* reading response from TTY */
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/*
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* Client connection related data storage structure
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*/
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typedef struct conn_t
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{
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struct conn_t *prev; /* linked list previous connection */
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struct conn_t *next; /* linked list next connection */
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int sd; /* socket descriptor */
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int state; /* current state */
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int timeout; /* timeout value, secs */
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char remote_addr[INET6_ADDRSTRLEN]; /* remote client address */
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int ctr; /* counter of data in the buffer */
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int read_len; /* length of modbus frame to read */
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unsigned char buf[HDRSIZE + BUFSIZE]; /* data buffer */
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} conn_t;
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/* prototypes */
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int conn_init(void);
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void conn_loop(void);
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void conn_open(void);
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conn_t *conn_close(conn_t *conn);
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#endif /* _CONN_H */
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