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Merge pull request #43 from temperednetworks/modbus-framing
modbus: read only a single frame at a time
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commit
f8b6448b08
@ -767,7 +767,7 @@ conn_loop(void)
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{
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rc = conn_read(curconn->sd,
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curconn->buf + curconn->ctr,
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RQSTSIZE - curconn->ctr);
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curconn->read_len - curconn->ctr);
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if (rc <= 0)
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{ /* error - drop this connection and go to next queue element */
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curconn = conn_close(curconn);
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@ -105,6 +105,7 @@ typedef struct conn_t
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int timeout; /* timeout value, secs */
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struct sockaddr_in sockaddr; /* connection structure */
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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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@ -32,6 +32,7 @@
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*/
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#include "modbus.h"
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#include "conn.h"
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/*
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* Check CRC of MODBUS frame
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@ -83,5 +84,6 @@ modbus_check_header(unsigned char *packet)
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return (MB_FRAME(packet, MB_PROTO_ID_H) == 0 &&
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MB_FRAME(packet, MB_PROTO_ID_L) == 0 &&
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MB_FRAME(packet, MB_LENGTH_H) == 0 &&
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MB_FRAME(packet, MB_LENGTH_L) > 0) ? RC_OK : RC_ERR;
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MB_FRAME(packet, MB_LENGTH_L) > 0 &&
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MB_FRAME(packet, MB_LENGTH_L) < BUFSIZE - CRCSIZE) ? RC_OK : RC_ERR;
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}
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@ -74,12 +74,14 @@ state_conn_set(conn_t *conn, int state)
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{
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case CONN_HEADER:
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conn->ctr = 0;
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conn->read_len = HDRSIZE;
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#ifdef DEBUG
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logw(5, "conn[%s]: state now is CONN_HEADER",
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inet_ntoa(conn->sockaddr.sin_addr));
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#endif
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break;
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case CONN_RQST_FUNC:
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conn->read_len = HDRSIZE + MB_FRAME(conn->buf, MB_LENGTH_L);
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#ifdef DEBUG
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logw(5, "conn[%s]: state now is CONN_RQST_FUNC",
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inet_ntoa(conn->sockaddr.sin_addr));
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