203 lines
7.0 KiB
C
203 lines
7.0 KiB
C
/* packet-vmlab.c
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* Routines for VMware Lab Manager Frame Dis-assembly
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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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/* History
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*
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* Apr 4, 2010 - David Aggeler
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*
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* - Initial version based on packet-vlan.c
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*
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* VMware Lab Manager is using this encapsulation directly as Ethernet Frames
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* or inside VLANs. The Ethernet type was originally registered to Akimbi, but VMware
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* acquired this company in 2006. No public information found, so the decoding here
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* is an educated guess. Since one of the features of Lab Manager is to separate
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* VMs with equal host name, IP and MAC Address, I expect the upper layer dissectors
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* (namely ARP, ICMP, IP, TCP) to create false alerts, since identical configurations
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* may communicate at the same time. The main goal of this dissector is to be able
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* to troubleshoot connectivity, preferably pings. It's also a little to understand
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* as to how host spanning fenced configurations actually talk.
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*
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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/addr_resolv.h>
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#include <epan/etypes.h>
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void proto_register_vmlab(void);
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void proto_reg_handoff_vmlab(void);
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static dissector_handle_t ethertype_handle;
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static int proto_vmlab = -1;
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static int hf_vmlab_flags_part1 = -1; /* Unknown so far */
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static int hf_vmlab_flags_fragment = -1;
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static int hf_vmlab_flags_part2 = -1; /* Unknown so far */
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static int hf_vmlab_portgroup = -1;
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static int hf_vmlab_eth_src = -1;
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static int hf_vmlab_eth_dst = -1;
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static int hf_vmlab_eth_addr = -1;
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static int hf_vmlab_etype = -1;
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static int hf_vmlab_trailer = -1;
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static gint ett_vmlab = -1;
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static const value_string fragment_vals[] = {
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{ 0, "Not set" },
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{ 1, "Set" },
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{ 0, NULL }
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};
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static int
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dissect_vmlab(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree* vmlab_tree;
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proto_item* ti;
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guint32 offset=0;
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guint8 attributes;
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guint8 portgroup;
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ethertype_data_t ethertype_data;
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guint16 encap_proto;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "VMLAB");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_vmlab, tvb, 0, 24, ENC_NA);
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vmlab_tree = proto_item_add_subtree(ti, ett_vmlab);
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/* Flags*/
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attributes = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(vmlab_tree, hf_vmlab_flags_part1, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(vmlab_tree, hf_vmlab_flags_fragment, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(vmlab_tree, hf_vmlab_flags_part2, tvb, offset, 1, ENC_BIG_ENDIAN);
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if (attributes & 0x04) {
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proto_item_append_text(ti, ", Fragment");
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}
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offset += 1;
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/* Portgroup*/
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portgroup = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(vmlab_tree, hf_vmlab_portgroup, tvb, offset, 1, portgroup);
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proto_item_append_text(ti, ", Portgroup: %d", portgroup);
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offset += 1;
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/* The next two bytes were always 0x0000 as far as I could tell*/
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offset += 2;
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/* Not really clear, what the difference between this and the next MAC address is
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Both are usually equal*/
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proto_tree_add_item(vmlab_tree, hf_vmlab_eth_addr, tvb, offset, 6, ENC_NA);
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offset += 6;
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proto_tree_add_item(vmlab_tree, hf_vmlab_eth_dst, tvb, offset, 6, ENC_NA);
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offset += 6;
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/* Source MAC*/
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proto_tree_add_item(vmlab_tree, hf_vmlab_eth_src, tvb, offset, 6, ENC_NA);
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offset += 6;
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proto_item_append_text(ti, ", Src: %s, Dst: %s",
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tvb_address_with_resolution_to_str(wmem_packet_scope(), tvb, AT_ETHER, offset-6),
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tvb_address_with_resolution_to_str(wmem_packet_scope(), tvb, AT_ETHER, offset-12));
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/* Encapsulated Ethertype is also part of the block*/
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encap_proto = tvb_get_ntohs(tvb, offset);
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offset += 2;
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/* Now call whatever was encapsulated*/
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ethertype_data.etype = encap_proto;
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ethertype_data.offset_after_ethertype = offset;
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ethertype_data.fh_tree = vmlab_tree;
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ethertype_data.etype_id = hf_vmlab_etype;
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ethertype_data.trailer_id = hf_vmlab_trailer;
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ethertype_data.fcs_len = 0;
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call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_vmlab(void)
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{
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static hf_register_info hf[] = {
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{ &hf_vmlab_flags_part1, { "Unknown", "vmlab.unknown1",
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FT_UINT8, BASE_HEX, NULL, 0xF8, NULL, HFILL }},
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{ &hf_vmlab_flags_fragment, { "More Fragments", "vmlab.fragment",
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FT_UINT8, BASE_DEC, VALS(fragment_vals), 0x04, NULL, HFILL }},
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{ &hf_vmlab_flags_part2, { "Unknown", "vmlab.unknown2",
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FT_UINT8, BASE_HEX, NULL, 0x03, NULL, HFILL }},
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{ &hf_vmlab_portgroup, { "Portgroup", "vmlab.pgrp",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
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{ &hf_vmlab_eth_src, { "Source", "vmlab.src",
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FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_vmlab_eth_dst, { "Destination", "vmlab.dst",
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FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_vmlab_eth_addr, { "Address", "vmlab.addr",
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FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_vmlab_etype, { "Encapsulated Type", "vmlab.subtype",
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FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }},
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{ &hf_vmlab_trailer, { "Trailer", "vmlab.trailer",
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FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}
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};
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static gint *ett[] = {
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&ett_vmlab
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};
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proto_vmlab = proto_register_protocol("VMware Lab Manager", "VMLAB", "vmlab");
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proto_register_field_array(proto_vmlab, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_vmlab(void)
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{
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dissector_handle_t vmlab_handle;
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vmlab_handle = create_dissector_handle(dissect_vmlab, proto_vmlab);
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dissector_add_uint("ethertype", ETHERTYPE_VMLAB, vmlab_handle);
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ethertype_handle = find_dissector_add_dependency("ethertype", proto_vmlab);
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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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