![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
262 lines
7.5 KiB
C
262 lines
7.5 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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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.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_register_cnip(void);
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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 expert_field ei_cnip_type_unknown = EI_INIT;
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static dissector_table_t cnip_dissector_table;
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static int dissect_cnip (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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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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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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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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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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exth_len = tvb_get_guint8(tvb, 4);
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pf_pcode = tvb_get_guint8(tvb, 5) & 0x1F;
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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, ENC_NA);
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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, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cnip_tree, hf_cnip_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cnip_tree, hf_cnip_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cnip_tree, hf_cnip_exth, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_bitmask(cnip_tree, tvb, offset,
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hf_cnip_pf, ett_pf, pf_fields, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cnip_tree, hf_cnip_vcode, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cnip_tree, hf_cnip_sessid, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(cnip_tree, hf_cnip_seqno, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(cnip_tree, hf_cnip_tstamp, tvb, offset, 4, ENC_BIG_ENDIAN);
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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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next_tvb = tvb_new_subset_remaining(tvb, offset);
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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 tvb_captured_length(tvb);
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}
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else {
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expert_add_info_format(pinfo, cnip_tree, &ei_cnip_type_unknown,
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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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call_data_dissector(next_tvb, pinfo, tree);
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return tvb_captured_length(tvb);
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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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static ei_register_info ei[] = {
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{ &ei_cnip_type_unknown, { "cnip.type.unknown", PI_UNDECODED, PI_WARN, "This dissector doesn't yet decode packets of type", EXPFILL }},
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};
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expert_module_t* expert_cnip;
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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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expert_cnip = expert_register_protocol(proto_cnip);
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expert_register_field_array(expert_cnip, ei, array_length(ei));
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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", proto_cnip, FT_UINT8, BASE_DEC, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
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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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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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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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