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Diffstat (limited to 'epan/dissectors/packet-cgmp.c')
| -rw-r--r-- | epan/dissectors/packet-cgmp.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/epan/dissectors/packet-cgmp.c b/epan/dissectors/packet-cgmp.c new file mode 100644 index 0000000000..d3611c7190 --- /dev/null +++ b/epan/dissectors/packet-cgmp.c @@ -0,0 +1,143 @@ +/* packet-cgmp.c + * Routines for the disassembly of the Cisco Group Management Protocol + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include "config.h" + +#include <stdlib.h> +#include <string.h> + +#include <glib.h> +#include <epan/packet.h> + +/* + * See + * + * http://www.barnett.sk/software/bbooks/cisco_multicasting_routing/chap04.html + * + * for some information on CGMP. + */ + +static int proto_cgmp = -1; +static int hf_cgmp_version = -1; +static int hf_cgmp_type = -1; +static int hf_cgmp_count = -1; +static int hf_cgmp_gda = -1; +static int hf_cgmp_usa = -1; + +static gint ett_cgmp = -1; + +static const value_string type_vals[] = { + { 0, "Join" }, + { 1, "Leave" }, + { 0, NULL }, +}; + +static void +dissect_cgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + proto_item *ti; + proto_tree *cgmp_tree = NULL; + int offset = 0; + guint8 count; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "CGMP"); + if (check_col(pinfo->cinfo, COL_INFO)) + col_set_str(pinfo->cinfo, COL_INFO, "Cisco Group Management Protocol"); + + if (tree) { + ti = proto_tree_add_item(tree, proto_cgmp, tvb, offset, -1, + FALSE); + cgmp_tree = proto_item_add_subtree(ti, ett_cgmp); + + proto_tree_add_item(cgmp_tree, hf_cgmp_version, tvb, offset, 1, + FALSE); + proto_tree_add_item(cgmp_tree, hf_cgmp_type, tvb, offset, 1, + FALSE); + offset += 1; + + offset += 2; /* skip reserved field */ + + count = tvb_get_guint8(tvb, offset); + proto_tree_add_uint(cgmp_tree, hf_cgmp_count, tvb, offset, 1, + count); + offset += 1; + + while (count != 0) { + proto_tree_add_item(cgmp_tree, hf_cgmp_gda, tvb, offset, 6, + FALSE); + offset += 6; + + proto_tree_add_item(cgmp_tree, hf_cgmp_usa, tvb, offset, 6, + FALSE); + offset += 6; + + count--; + } + } +} + +void +proto_register_cgmp(void) +{ + static hf_register_info hf[] = { + { &hf_cgmp_version, + { "Version", "cgmp.version", FT_UINT8, BASE_DEC, NULL, 0xF0, + "", HFILL }}, + + { &hf_cgmp_type, + { "Type", "cgmp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0F, + "", HFILL }}, + + { &hf_cgmp_count, + { "Count", "cgmp.count", FT_UINT8, BASE_DEC, NULL, 0x0, + "", HFILL }}, + + { &hf_cgmp_gda, + { "Group Destination Address", "cgmp.gda", FT_ETHER, BASE_NONE, NULL, 0x0, + "Group Destination Address", HFILL }}, + + { &hf_cgmp_usa, + { "Unicast Source Address", "cgmp.usa", FT_ETHER, BASE_NONE, NULL, 0x0, + "Unicast Source Address", HFILL }}, + }; + static gint *ett[] = { + &ett_cgmp, + }; + + proto_cgmp = proto_register_protocol("Cisco Group Management Protocol", + "CGMP", "cgmp"); + proto_register_field_array(proto_cgmp, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_cgmp(void) +{ + dissector_handle_t cgmp_handle; + + cgmp_handle = create_dissector_handle(dissect_cgmp, proto_cgmp); + dissector_add("llc.cisco_pid", 0x2001, cgmp_handle); + dissector_add("ethertype", 0x2001, cgmp_handle); +} |