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/* packet-cnip.c
* Traffic analyzer for the CN/IP (EIA-852) protocol
* Daniel Willmann <daniel@totalueberwachung.de>
* (c) 2011 Daniel Willmann
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#define DATA_PACKET 0x01
#define CNIP_UDP_PORT_RANGE "1628-1629" /* Not IANA registered */
static const value_string type_tuple[]=
{
{0x01, "Data Packet"},
{0x63, "Device Configuration Request"},
{0x03, "Device Registration"},
{0x71, "Device Configuration"},
{0x64, "Channel Membership Request"},
{0x04, "Channel Membership"},
{0x66, "Send List Request"},
{0x06, "Send List"},
{0x68, "Channel Routing Request"},
{0x08, "Channel Routing"},
{0x07, "Acknowledge"},
{0x7F, "Segment"},
{0x60, "Status/Health/Statistics Request"},
{0x70, "Status/Health/Statistics Response"},
{0, NULL}
};
void proto_register_cnip(void);
void proto_reg_handoff_cnip(void);
static dissector_handle_t cnip_handle;
static int hf_cnip_len;
static int hf_cnip_ver;
static int hf_cnip_type;
static int hf_cnip_exth;
static int hf_cnip_pf;
static int hf_cnip_pf_sec;
static int hf_cnip_pf_pcode;
static int hf_cnip_vcode;
static int hf_cnip_sessid;
static int hf_cnip_seqno;
static int hf_cnip_tstamp;
static int proto_cnip;
static int ett_cnip;
static int ett_pf;
static expert_field ei_cnip_type_unknown;
static dissector_table_t cnip_dissector_table;
static int dissect_cnip (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
tvbuff_t *next_tvb;
int offset;
int type, exth_len, pf_pcode;
proto_tree *ti;
proto_tree *cnip_tree;
static int * const pf_fields[] = {
&hf_cnip_pf_sec,
&hf_cnip_pf_pcode,
NULL
};
col_set_str(pinfo->cinfo, COL_PROTOCOL, "CN/IP");
col_clear(pinfo->cinfo, COL_INFO);
type = tvb_get_uint8(tvb, 3);
col_add_fstr(pinfo->cinfo, COL_INFO,"Priority: %s Type: %s",
(pinfo->destport == 1629 )? "urgent":"normal",
val_to_str_const(type, type_tuple, "Unknown"));
exth_len = tvb_get_uint8(tvb, 4);
pf_pcode = tvb_get_uint8(tvb, 5) & 0x1F;
offset = 0;
/* Take whole packet for now, we'll adjust it later */
ti = proto_tree_add_item(tree, proto_cnip, tvb, offset, -1, ENC_NA);
cnip_tree = proto_item_add_subtree(ti, ett_cnip);
proto_tree_add_item(cnip_tree, hf_cnip_len, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(cnip_tree, hf_cnip_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cnip_tree, hf_cnip_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cnip_tree, hf_cnip_exth, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_bitmask(cnip_tree, tvb, offset,
hf_cnip_pf, ett_pf, pf_fields, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cnip_tree, hf_cnip_vcode, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(cnip_tree, hf_cnip_sessid, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(cnip_tree, hf_cnip_seqno, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(cnip_tree, hf_cnip_tstamp, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* Jump over any unknown header extensions */
offset += 4 * exth_len;
proto_item_set_len(ti, offset);
next_tvb = tvb_new_subset_remaining(tvb, offset);
if (type == DATA_PACKET) {
if (dissector_try_uint(cnip_dissector_table, pf_pcode, next_tvb, pinfo, tree))
return tvb_captured_length(tvb);
}
else {
expert_add_info_format(pinfo, cnip_tree, &ei_cnip_type_unknown,
"This dissector doesn't yet decode packets of type %s (0x%x)",
val_to_str_const(type, type_tuple, "Unknown"), type);
}
call_data_dissector(next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
void proto_register_cnip(void)
{
static hf_register_info hf[] =
{
{&hf_cnip_len,
{"Packet length", "cnip.len",
FT_UINT16, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{&hf_cnip_ver,
{"Version", "cnip.ver",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{&hf_cnip_type,
{"Packet type", "cnip.type",
FT_UINT8, BASE_HEX, VALS(type_tuple), 0,
NULL, HFILL }
},
{&hf_cnip_exth,
{"Ext. Header Size", "cnip.exth",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{&hf_cnip_pf,
{"Protocol Flags", "cnip.pf",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{&hf_cnip_pf_sec,
{"Protocol Flags", "cnip.sec",
FT_UINT8, BASE_DEC, NULL, 0x20,
NULL, HFILL }
},
{&hf_cnip_pf_pcode,
{"Protocol Code", "cnip.protocol",
FT_UINT8, BASE_DEC, NULL, 0x1F,
NULL, HFILL }
},
{&hf_cnip_vcode,
{"Vendor Code", "cnip.vendorcode",
FT_UINT16, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{&hf_cnip_sessid,
{"Session ID", "cnip.sessid",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{&hf_cnip_seqno,
{"Sequence Number", "cnip.seqno",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }
},
{&hf_cnip_tstamp,
{"Time Stamp", "cnip.tstamp",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }
}
};
static int *ett[] =
{
&ett_cnip,
&ett_pf
};
static ei_register_info ei[] = {
{ &ei_cnip_type_unknown, { "cnip.type.unknown", PI_UNDECODED, PI_WARN, "This dissector doesn't yet decode packets of type", EXPFILL }},
};
expert_module_t* expert_cnip;
proto_cnip = proto_register_protocol("Component Network over IP",
"CN/IP", "cnip");
proto_register_field_array(proto_cnip, hf, array_length (hf));
proto_register_subtree_array(ett, array_length (ett));
expert_cnip = expert_register_protocol(proto_cnip);
expert_register_field_array(expert_cnip, ei, array_length(ei));
/* Register table for subdissectors */
cnip_dissector_table = register_dissector_table("cnip.protocol",
"CN/IP Protocol", proto_cnip, FT_UINT8, BASE_DEC);
cnip_handle = register_dissector("cnip", dissect_cnip, proto_cnip);
}
void proto_reg_handoff_cnip(void)
{
dissector_add_uint_range_with_preference("udp.port", CNIP_UDP_PORT_RANGE, cnip_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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