forked from osmocom/wireshark
262 lines
6.5 KiB
C
262 lines
6.5 KiB
C
![]() |
/* packet-cnip.c
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* Traffic analyzer for the CN/IP (EIA-852) protocol
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* Daniel Willmann <daniel@totalueberwachung.de>
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* (c) 2011 Daniel Willmann
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/expert.h>
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#define DATA_PACKET 0x01
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static const value_string type_tuple[]=
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{
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{0x01, "Data Packet"},
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{0x63, "Device Configuration Request"},
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{0x03, "Device Registration"},
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{0x71, "Device Configuration"},
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{0x64, "Channel Membership Request"},
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{0x04, "Channel Membership"},
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{0x66, "Send List Request"},
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{0x06, "Send List"},
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{0x68, "Channel Routing Request"},
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{0x08, "Channel Routing"},
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{0x07, "Acknowledge"},
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{0x7F, "Segment"},
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{0x60, "Status/Health/Statistics Request"},
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{0x70, "Status/Health/Statistics Response"},
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{0, NULL}
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};
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void proto_reg_handoff_cnip(void);
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static gint hf_cnip_len = -1;
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static gint hf_cnip_ver = -1;
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static gint hf_cnip_type = -1;
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static gint hf_cnip_exth = -1;
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static gint hf_cnip_pf = -1;
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static gint hf_cnip_pf_sec = -1;
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static gint hf_cnip_pf_pcode = -1;
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static gint hf_cnip_vcode = -1;
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static gint hf_cnip_sessid = -1;
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static gint hf_cnip_seqno = -1;
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static gint hf_cnip_tstamp = -1;
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static gint proto_cnip = -1;
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static gint ett_cnip = -1;
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static gint ett_pf = -1;
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static dissector_table_t cnip_dissector_table;
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static dissector_handle_t data_handle;
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static void dissect_cnip (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb;
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gint offset;
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gint type, exth_len, pf_pcode;
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proto_tree *ti;
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proto_tree *cnip_tree;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CN/IP");
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col_clear(pinfo->cinfo, COL_INFO);
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type = tvb_get_guint8(tvb, 3);
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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col_add_fstr(pinfo->cinfo, COL_INFO,"Priority: %s Type: %s",
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(pinfo->destport == 1629 )? "urgent":"normal",
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val_to_str_const(type, type_tuple, "Unknown"));
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}
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exth_len = tvb_get_guint8(tvb, 4);
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pf_pcode = tvb_get_guint8(tvb, 5) & 0x1F;
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if (tree) {
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offset = 0;
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/* Take whole packet for now, we'll adjust it later */
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ti = proto_tree_add_item(tree, proto_cnip, tvb, offset, -1, FALSE);
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cnip_tree = proto_item_add_subtree(ti, ett_cnip);
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proto_tree_add_item(cnip_tree, hf_cnip_len, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(cnip_tree, hf_cnip_ver, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(cnip_tree, hf_cnip_type, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(cnip_tree, hf_cnip_exth, tvb, offset, 1, FALSE);
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offset += 1;
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{
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static const gint *pf_fields[] = {
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&hf_cnip_pf_sec,
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&hf_cnip_pf_pcode,
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NULL
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};
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proto_tree_add_bitmask(cnip_tree, tvb, offset, hf_cnip_pf,
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ett_pf, pf_fields, FALSE);
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}
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offset += 1;
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proto_tree_add_item(cnip_tree, hf_cnip_vcode, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(cnip_tree, hf_cnip_sessid, tvb, offset, 4, FALSE);
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offset += 4;
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proto_tree_add_item(cnip_tree, hf_cnip_seqno, tvb, offset, 4, FALSE);
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offset += 4;
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proto_tree_add_item(cnip_tree, hf_cnip_tstamp, tvb, offset, 4, FALSE);
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offset += 4;
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/* Jump over any unknown header extensions */
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offset += 4 * exth_len;
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proto_item_set_len(ti, offset);
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if (type != DATA_PACKET) {
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expert_add_info_format(pinfo, cnip_tree,
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PI_UNDECODED, PI_WARN,
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"This dissector doesn't yet decode packets of type %s (0x%x)",
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val_to_str_const(type, type_tuple, "Unknown"), type);
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}
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} else {
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offset = 20 + 4*exth_len;
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}
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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/* Try subdissectors only for data packets*/
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if (type == DATA_PACKET) {
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if (dissector_try_uint(cnip_dissector_table, pf_pcode, next_tvb, pinfo, tree))
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return;
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}
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call_dissector(data_handle, next_tvb, pinfo, tree);
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return;
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}
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void proto_register_cnip(void)
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{
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static hf_register_info hf[] =
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{
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{&hf_cnip_len,
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{"Packet length", "cnip.len",
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FT_UINT16, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{&hf_cnip_ver,
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{"Version", "cnip.ver",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{&hf_cnip_type,
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{"Packet type", "cnip.type",
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FT_UINT8, BASE_HEX, VALS(type_tuple), 0,
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NULL, HFILL }
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},
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{&hf_cnip_exth,
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{"Ext. Header Size", "cnip.exth",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{&hf_cnip_pf,
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{"Protocol Flags", "cnip.pf",
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FT_UINT8, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{&hf_cnip_pf_sec,
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{"Protocol Flags", "cnip.sec",
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FT_UINT8, BASE_DEC, NULL, 0x20,
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NULL, HFILL }
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},
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{&hf_cnip_pf_pcode,
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{"Protocol Code", "cnip.protocol",
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FT_UINT8, BASE_DEC, NULL, 0x1F,
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NULL, HFILL }
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},
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{&hf_cnip_vcode,
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{"Vendor Code", "cnip.vendorcode",
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FT_UINT16, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{&hf_cnip_sessid,
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{"Session ID", "cnip.sessid",
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FT_UINT32, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{&hf_cnip_seqno,
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{"Sequence Number", "cnip.seqno",
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FT_UINT32, BASE_DEC, NULL, 0,
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NULL, HFILL }
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},
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{&hf_cnip_tstamp,
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{"Time Stamp", "cnip.tstamp",
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FT_UINT32, BASE_DEC, NULL, 0,
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NULL, HFILL }
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}
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};
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static gint *ett[] =
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{
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&ett_cnip,
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&ett_pf
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};
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proto_cnip = proto_register_protocol("Component Network over IP",
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"CN/IP", "cnip");
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proto_register_field_array(proto_cnip, hf, array_length (hf));
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proto_register_subtree_array(ett, array_length (ett));
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/* Register table for subdissectors */
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cnip_dissector_table = register_dissector_table("cnip.protocol",
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"CN/IP Protocol", FT_UINT8, BASE_DEC);
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}
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void proto_reg_handoff_cnip(void)
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{
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dissector_handle_t cnip_handle;
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cnip_handle = create_dissector_handle(dissect_cnip, proto_cnip);
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data_handle = find_dissector("data");
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dissector_add_uint ("udp.port", 1628, cnip_handle);
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dissector_add_uint ("udp.port", 1629, cnip_handle);
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}
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