forked from osmocom/wireshark
134 lines
3.6 KiB
C
134 lines
3.6 KiB
C
/* packet-rgmp.c
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* Routines for IGMP/RGMP packet disassembly
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* Copyright 2006 Jaap Keuter
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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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/*
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Based on RFC3488
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This is a setup for RGMP dissection, a simple protocol bolted on IGMP.
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The trick is to have IGMP dissector call this function (which by itself is not
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registered as dissector). IGAP and other do the same.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include "packet-igmp.h"
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#include "packet-rgmp.h"
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void proto_register_rgmp(void);
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static int proto_rgmp = -1;
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static int hf_type = -1;
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static int hf_checksum = -1;
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static int hf_checksum_bad = -1;
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static int hf_maddr = -1;
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static int ett_rgmp = -1;
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static const value_string rgmp_types[] = {
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{IGMP_RGMP_LEAVE, "Leave"},
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{IGMP_RGMP_JOIN, "Join"},
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{IGMP_RGMP_BYE, "Bye"},
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{IGMP_RGMP_HELLO, "Hello"},
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{0, NULL}
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};
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/* This function is only called from the IGMP dissector */
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int
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dissect_rgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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proto_tree *tree;
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proto_item *item;
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guint8 type;
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if (!proto_is_protocol_enabled(find_protocol_by_id(proto_rgmp))) {
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/* we are not enabled, skip entire packet to be nice
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to the igmp layer. (so clicking on IGMP will display the data)
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*/
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return offset + tvb_length_remaining(tvb, offset);
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}
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item = proto_tree_add_item(parent_tree, proto_rgmp, tvb, offset, -1, ENC_NA);
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tree = proto_item_add_subtree(item, ett_rgmp);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RGMP");
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col_clear(pinfo->cinfo, COL_INFO);
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type = tvb_get_guint8(tvb, offset);
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(type, rgmp_types, "Unknown Type: 0x%02x"));
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proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
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offset += 1;
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/* reserved */
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offset += 1;
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igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
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offset += 2;
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proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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return offset;
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}
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void
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proto_register_rgmp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_type,
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{ "Type", "rgmp.type", FT_UINT8, BASE_HEX,
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VALS(rgmp_types), 0, "RGMP Packet Type", HFILL }
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},
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{ &hf_checksum,
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{ "Checksum", "rgmp.checksum", FT_UINT16, BASE_HEX,
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NULL, 0, NULL, HFILL }
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},
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{ &hf_checksum_bad,
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{ "Bad Checksum", "rgmp.checksum_bad", FT_BOOLEAN, BASE_NONE,
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NULL, 0x0, NULL, HFILL }
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},
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{ &hf_maddr,
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{ "Multicast group address", "rgmp.maddr", FT_IPv4, BASE_NONE,
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NULL, 0, NULL, HFILL }
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}
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};
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static gint *ett[] = {
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&ett_rgmp
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};
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proto_rgmp = proto_register_protocol
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("Router-port Group Management Protocol", "RGMP", "rgmp");
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proto_register_field_array(proto_rgmp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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