/* packet-cnip.c * Traffic analyzer for the CN/IP (EIA-852) protocol * Daniel Willmann * (c) 2011 Daniel Willmann * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #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: */