*
* for information on Modbus/TCP.
*
- * $Id: packet-mbtcp.c,v 1.7 2001/12/10 00:25:30 guy Exp $
+ * $Id: packet-mbtcp.c,v 1.11 2002/08/28 21:00:20 jmayer Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
- *
+ *
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
/* TODO:
* Analysis of the payload of the Modbus packet.
- * -- Based on the function code in the header, and the fact that the packet is
- * either a query or a response, the different fields in the payload can be
+ * -- Based on the function code in the header, and the fact that the packet is
+ * either a query or a response, the different fields in the payload can be
* interpreted and displayed.
*/
#include <stdlib.h>
#include <string.h>
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
-#ifdef HAVE_NETINET_IN_H
-# include <netinet/in.h>
-#endif
-
#include <glib.h>
-#ifdef NEED_SNPRINTF_H
-# include "snprintf.h"
-#endif
+#include <epan/packet.h>
-#include "packet.h"
-
-#define DEBUG
+#define DEBUG
#define TCP_PORT_MBTCP 502 /* Modbus/TCP located on TCP port 502 */
/* Initialize the subtree pointers */
static gint ett_mbtcp = -1;
static gint ett_modbus_hdr = -1;
-
+
static int
classify_packet(packet_info *pinfo)
{
if ( ( 502 == pinfo->srcport && 502 != pinfo->destport ) ||
( 502 != pinfo->srcport && 502 == pinfo->destport ) ) {
/* the slave is receiving queries on port 502 */
- if ( 502 == pinfo->srcport )
+ if ( 502 == pinfo->srcport )
return response_packet;
- else if ( 502 == pinfo->destport )
+ else if ( 502 == pinfo->destport )
return query_packet;
}
/* else, cannot classify */
return cannot_classify;
}
-/* returns string describing function, as given on p6 of
+/* returns string describing function, as given on p6 of
* "Open Modbus/TCP Specification", release 1 by Andy Swales. */
static char *
function_string(guint16 func_code)
char *func_string = "", pkt_type_str[9] = "";
char err_str[100] = "";
int packet_type;
- guint32 packet_num = 0; /* num to uniquely identify different mbtcp
+ guint32 packet_num = 0; /* num to uniquely identify different mbtcp
* packets in one TCP packet */
guint8 exception_code = 0, exception_returned = 0;
-
+
/* Make entries in Protocol column on summary display */
- if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Modbus/TCP");
if (check_col(pinfo->cinfo, COL_INFO))
/* Make entries in Info column on summary display (updated after building proto tree) */
tvb_memcpy(tvb, (guint8 *)&mh, offset, sizeof(mbtcp_hdr));
- mh.transaction_id = ntohs(mh.transaction_id);
- mh.protocol_id = ntohs(mh.protocol_id);
- mh.len = ntohs(mh.len);
+ mh.transaction_id = g_ntohs(mh.transaction_id);
+ mh.protocol_id = g_ntohs(mh.protocol_id);
+ mh.len = g_ntohs(mh.len);
if ( mh.mdbs_hdr.function_code & 0x80 ) {
mh.mdbs_hdr.function_code ^= 0x80;
exception_returned = 1;
{
packet_type = classify_packet(pinfo);
switch ( packet_type ) {
- case query_packet : strcpy(pkt_type_str, "query");
+ case query_packet : strcpy(pkt_type_str, "query");
break;
- case response_packet : strcpy(pkt_type_str, "response");
+ case response_packet : strcpy(pkt_type_str, "response");
break;
case cannot_classify : strcpy(err_str, "Unable to classify as query or response.");
strcpy(pkt_type_str, "unknown");
}
if ( exception_returned )
strcpy(err_str, "Exception returned ");
- col_add_fstr(pinfo->cinfo, COL_INFO,
- "%8s [%2u pkt(s)]: trans: %5u; unit: %3u, func: %3u: %s. %s",
- pkt_type_str, 1, mh.transaction_id, (unsigned char) mh.mdbs_hdr.unit_id,
+ col_add_fstr(pinfo->cinfo, COL_INFO,
+ "%8s [%2u pkt(s)]: trans: %5u; unit: %3u, func: %3u: %s. %s",
+ pkt_type_str, 1, mh.transaction_id, (unsigned char) mh.mdbs_hdr.unit_id,
(unsigned char) mh.mdbs_hdr.function_code, func_string, err_str);
- }
+ }
/* build up protocol tree */
do {
/* Avoids alignment problems on many architectures. */
tvb_memcpy(tvb, (guint8 *)&mh, offset, sizeof(mbtcp_hdr));
- mh.transaction_id = ntohs(mh.transaction_id);
- mh.protocol_id = ntohs(mh.protocol_id);
- mh.len = ntohs(mh.len);
-
+ mh.transaction_id = g_ntohs(mh.transaction_id);
+ mh.protocol_id = g_ntohs(mh.protocol_id);
+ mh.len = g_ntohs(mh.len);
+
if ( mh.mdbs_hdr.function_code & 0x80 ) {
tvb_memcpy(tvb, (guint8 *)&exception_code, offset + sizeof(mbtcp_hdr), 1);
mh.mdbs_hdr.function_code ^= 0x80;
exception_returned = 1;
- } else
+ } else
exception_code = 0;
-
+
packet_type = classify_packet(pinfo);
-
+
/* if a tree exists, perform operations to add fields to it */
if (tree) {
packet_len = sizeof(mbtcp_hdr) - sizeof(modbus_hdr) + mh.len;
- mi = proto_tree_add_protocol_format(tree, proto_mbtcp, tvb, offset,
+ mi = proto_tree_add_protocol_format(tree, proto_mbtcp, tvb, offset,
packet_len, "Modbus/TCP");
mbtcp_tree = proto_item_add_subtree(mi, ett_mbtcp);
-
+
/* Add items to protocol tree */
/* Modbus/TCP */
- proto_tree_add_uint(mbtcp_tree, hf_mbtcp_transid, tvb, offset, 2,
+ proto_tree_add_uint(mbtcp_tree, hf_mbtcp_transid, tvb, offset, 2,
mh.transaction_id);
- proto_tree_add_uint(mbtcp_tree, hf_mbtcp_protid, tvb, offset + 2, 2,
+ proto_tree_add_uint(mbtcp_tree, hf_mbtcp_protid, tvb, offset + 2, 2,
mh.protocol_id);
- proto_tree_add_uint(mbtcp_tree, hf_mbtcp_len, tvb, offset + 4, 2,
+ proto_tree_add_uint(mbtcp_tree, hf_mbtcp_len, tvb, offset + 4, 2,
mh.len);
/* Modbus */
packet_end = mh.len;
- mf = proto_tree_add_text(mbtcp_tree, tvb, offset + 6, packet_end,
+ mf = proto_tree_add_text(mbtcp_tree, tvb, offset + 6, packet_end,
"Modbus");
- modbus_tree = proto_item_add_subtree(mf, ett_modbus_hdr);
- proto_tree_add_item(modbus_tree, hf_mbtcp_unitid, tvb, offset + 6, 1,
+ modbus_tree = proto_item_add_subtree(mf, ett_modbus_hdr);
+ proto_tree_add_item(modbus_tree, hf_mbtcp_unitid, tvb, offset + 6, 1,
mh.mdbs_hdr.unit_id);
- mi = proto_tree_add_item(modbus_tree, hf_mbtcp_functioncode, tvb, offset + 7, 1,
+ mi = proto_tree_add_item(modbus_tree, hf_mbtcp_functioncode, tvb, offset + 7, 1,
mh.mdbs_hdr.function_code);
func_string = function_string(mh.mdbs_hdr.function_code);
- if ( 0 == exception_code )
- proto_item_set_text(mi, "function %u: %s", mh.mdbs_hdr.function_code,
+ if ( 0 == exception_code )
+ proto_item_set_text(mi, "function %u: %s", mh.mdbs_hdr.function_code,
func_string);
- else
- proto_item_set_text(mi, "function %u: %s. Exception: %s",
- mh.mdbs_hdr.function_code, func_string, exception_string(exception_code));
-
+ else
+ proto_item_set_text(mi, "function %u: %s. Exception: %s",
+ mh.mdbs_hdr.function_code, func_string, exception_string(exception_code));
+
packet_end = mh.len - 2;
- proto_tree_add_text(modbus_tree, tvb, offset + 8, packet_end,
+ proto_tree_add_text(modbus_tree, tvb, offset + 8, packet_end,
"Modbus data");
}
offset = offset + sizeof(mbtcp_hdr) + (mh.len - sizeof(modbus_hdr));
packet_num++;
} while ( tvb_reported_length_remaining(tvb, offset) > 0 );
-
+
/* Update entries in Info column on summary display */
if (check_col(pinfo->cinfo, COL_INFO))
{
switch ( packet_type ) {
- case query_packet : strcpy(pkt_type_str, "query");
+ case query_packet : strcpy(pkt_type_str, "query");
break;
- case response_packet : strcpy(pkt_type_str, "response");
+ case response_packet : strcpy(pkt_type_str, "response");
break;
case cannot_classify : strcpy(err_str, "Unable to classify as query or response.");
strcpy(pkt_type_str, "unknown");
}
if ( exception_returned )
strcpy(err_str, "Exception returned ");
- col_add_fstr(pinfo->cinfo, COL_INFO,
- "%8s [%2u pkt(s)]: trans: %5u; unit: %3u, func: %3u: %s. %s",
- pkt_type_str, packet_num, mh.transaction_id, (unsigned char) mh.mdbs_hdr.unit_id,
- (unsigned char) mh.mdbs_hdr.function_code, func_string, err_str);
+ col_add_fstr(pinfo->cinfo, COL_INFO,
+ "%8s [%2u pkt(s)]: trans: %5u; unit: %3u, func: %3u: %s. %s",
+ pkt_type_str, packet_num, mh.transaction_id, (unsigned char) mh.mdbs_hdr.unit_id,
+ (unsigned char) mh.mdbs_hdr.function_code, func_string, err_str);
}
/* If this protocol has a sub-dissector call it here, see section 1.8 */
void
proto_register_modbus(void)
-{
+{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
/* Modbus/TCP header fields */
{ &hf_mbtcp_transid,
{ "transaction identifier", "modbus_tcp.trans_id",
- FT_UINT16, BASE_DEC, NULL, 0x0,
+ FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_mbtcp_protid,
{ "protocol identifier", "modbus_tcp.prot_id",
- FT_UINT16, BASE_DEC, NULL, 0x0,
+ FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_mbtcp_len,
{ "length", "modbus_tcp.len",
- FT_UINT16, BASE_DEC, NULL, 0x0,
+ FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
/* Modbus header fields */
{ &hf_mbtcp_unitid,
{ "unit identifier", "modbus_tcp.unit_id",
- FT_UINT8, BASE_DEC, NULL, 0x0,
+ FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_mbtcp_functioncode,
{ "function code ", "modbus_tcp.func_code",
- FT_UINT8, BASE_DEC, NULL, 0x0,
+ FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
}
};
git.samba.org / obnox / wireshark / wip.git / blobdiff