2013-08-15 03:47:37 +00:00
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/* packet-udt.c
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2013-10-13 19:56:52 +00:00
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*
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2013-08-15 03:47:37 +00:00
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* Routines for UDT packet dissection
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*
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* Copyright 2013 (c) chas williams <chas@cmf.nrl.navy.mil>
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2013-10-13 19:56:52 +00:00
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*
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2013-08-15 03:47:37 +00:00
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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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* Copied from packet-tftp.c
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/conversation.h>
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#include <epan/expert.h>
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/*
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* based on http://tools.ietf.org/html/draft-gg-udt-03
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*/
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#define UDT_TYPE_DATA 0
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#define UDT_TYPE_CONTROL 1
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#define UDT_PACKET_TYPE_HANDSHAKE 0x0000
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#define UDT_PACKET_TYPE_KEEPALIVE 0x0001
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#define UDT_PACKET_TYPE_ACK 0x0002
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#define UDT_PACKET_TYPE_NAK 0x0003
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#define UDT_PACKET_TYPE_SHUTDOWN 0x0005
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#define UDT_PACKET_TYPE_ACK2 0x0006
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#define UDT_HANDSHAKE_TYPE_STREAM 0
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#define UDT_HANDSHAKE_TYPE_DGRAM 1
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static const value_string udt_packet_types[] = {
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{UDT_PACKET_TYPE_HANDSHAKE, "handshake"},
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{UDT_PACKET_TYPE_KEEPALIVE, "keepalive"},
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{UDT_PACKET_TYPE_ACK, "ack"},
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{UDT_PACKET_TYPE_NAK, "nak"},
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{UDT_PACKET_TYPE_SHUTDOWN, "shutdown"},
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{UDT_PACKET_TYPE_ACK2, "ack2"},
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{0, NULL},
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};
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static const value_string udt_handshake_types[] = {
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{UDT_HANDSHAKE_TYPE_STREAM, "STREAM"},
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{UDT_HANDSHAKE_TYPE_DGRAM, "DGRAM"},
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{0, NULL},
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};
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static const value_string udt_types[] = {
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{UDT_TYPE_DATA, "DATA"},
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{UDT_TYPE_CONTROL, "CONTROL"},
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{0, NULL},
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};
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static int proto_udt = -1;
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static int hf_udt_iscontrol = -1;
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static int hf_udt_type = -1;
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static int hf_udt_seqno = -1;
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static int hf_udt_ack_seqno = -1;
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static int hf_udt_ackno = -1;
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static int hf_udt_msgno = -1;
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static int hf_udt_msgno_first = -1;
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static int hf_udt_msgno_last = -1;
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static int hf_udt_msgno_inorder = -1;
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static int hf_udt_timestamp = -1;
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static int hf_udt_id = -1;
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static int hf_udt_addinfo = -1;
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static int hf_udt_rtt = -1;
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static int hf_udt_rttvar = -1;
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static int hf_udt_bufavail = -1;
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static int hf_udt_rate = -1;
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static int hf_udt_linkcap = -1;
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static int hf_udt_handshake_version = -1;
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static int hf_udt_handshake_type = -1;
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static int hf_udt_handshake_isn = -1;
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static int hf_udt_handshake_mtu = -1;
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static int hf_udt_handshake_flow_window = -1;
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static int hf_udt_handshake_reqtype = -1;
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static int hf_udt_handshake_id = -1;
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static int hf_udt_handshake_cookie = -1;
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static int hf_udt_handshake_peerip = -1;
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static gint ett_udt = -1;
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static expert_field ei_udt_nak_seqno = EI_INIT;
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static dissector_handle_t udt_handle;
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static dissector_handle_t data_handle;
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static int
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dissect_udt(tvbuff_t * tvb, packet_info * pinfo, proto_tree * parent_tree,
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void *data _U_)
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{
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proto_tree *tree;
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proto_item *udt_item;
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int is_control, type;
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guint i;
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/* Ensure we have enough data */
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if (tvb_length(tvb) < 16)
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return 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "UDT");
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col_clear(pinfo->cinfo, COL_INFO);
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is_control = tvb_get_ntohl(tvb, 0) & 0x80000000;
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type = (tvb_get_ntohl(tvb, 0) >> 16) & 0x7fff;
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if (is_control)
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col_add_fstr(pinfo->cinfo, COL_INFO, "UDT type: %s id: %x",
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val_to_str(type, udt_packet_types,
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"Unknown Control Type (%x)"),
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tvb_get_ntohl(tvb, 12));
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else
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"UDT type: data seqno: %u msgno: %u id: %x",
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tvb_get_ntohl(tvb, 0) & 0x7fffffff,
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tvb_get_ntohl(tvb, 4) & 0x1fffffff,
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tvb_get_ntohl(tvb, 12));
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udt_item = proto_tree_add_item(parent_tree, proto_udt, tvb,
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0, -1, ENC_NA);
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tree = proto_item_add_subtree(udt_item, ett_udt);
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proto_tree_add_item(tree, hf_udt_iscontrol, tvb, 0, 4, ENC_BIG_ENDIAN);
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if (is_control) {
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proto_tree_add_item(tree, hf_udt_type, tvb, 0, 2,
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ENC_BIG_ENDIAN);
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switch (type) {
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case UDT_PACKET_TYPE_ACK:
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proto_tree_add_item(tree, hf_udt_ackno, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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break;
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case UDT_PACKET_TYPE_ACK2:
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proto_tree_add_item(tree, hf_udt_ackno, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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break;
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default:
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proto_tree_add_item(tree, hf_udt_addinfo, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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}
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proto_tree_add_item(tree, hf_udt_timestamp, tvb, 8, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_id, tvb, 12, 4,
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ENC_BIG_ENDIAN);
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switch (type) {
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case UDT_PACKET_TYPE_HANDSHAKE:
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proto_tree_add_item(tree, hf_udt_handshake_version, tvb,
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16, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_type, tvb,
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20, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_isn, tvb, 24,
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4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_mtu, tvb, 28,
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4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_flow_window,
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tvb, 32, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_reqtype, tvb,
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36, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_id, tvb, 40,
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4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_cookie, tvb,
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44, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_handshake_peerip, tvb,
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48, 16, ENC_NA);
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proto_item_set_len(udt_item, 64);
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break;
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case UDT_PACKET_TYPE_ACK:
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proto_tree_add_item(tree, hf_udt_ack_seqno, tvb, 16, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_rtt, tvb, 20, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_rttvar, tvb, 24, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_bufavail, tvb, 28, 4,
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ENC_BIG_ENDIAN);
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/* if not a light ack, decode the rate and link capacity */
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if (tvb_length(tvb) == 40) {
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proto_tree_add_item(tree, hf_udt_rate, tvb, 32,
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4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_linkcap, tvb,
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36, 4, ENC_BIG_ENDIAN);
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proto_item_set_len(udt_item, 40);
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}
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else
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{
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proto_item_set_len(udt_item, 32);
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}
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break;
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case UDT_PACKET_TYPE_NAK:
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for (i = 16; i < tvb_length(tvb); i = i + 4) {
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guint32 start, finish;
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int is_range;
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is_range = tvb_get_ntohl(tvb, i) & 0x80000000;
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start = tvb_get_ntohl(tvb, i) & 0x7fffffff;
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if (is_range) {
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finish = tvb_get_ntohl(tvb, i + 4) & 0x7fffffff;
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proto_tree_add_expert_format(tree, pinfo, &ei_udt_nak_seqno,
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tvb, i, 8, "Missing Sequence Number(s): %u-%u",
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start, finish);
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i = i + 4;
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} else {
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proto_tree_add_expert_format(tree, pinfo, &ei_udt_nak_seqno,
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tvb, i, 4, "Missing Sequence Number: %u",
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start);
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}
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}
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proto_item_set_len(udt_item, tvb_length(tvb));
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break;
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}
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} else {
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/* otherwise, a data packet */
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tvbuff_t *next_tvb;
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proto_tree_add_item(tree, hf_udt_seqno, tvb, 0, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_msgno_first, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_msgno_last, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_msgno_inorder, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_msgno, tvb, 4, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_timestamp, tvb, 8, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_udt_id, tvb, 12, 4,
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ENC_BIG_ENDIAN);
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next_tvb = tvb_new_subset_remaining(tvb, 16);
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call_dissector(data_handle, next_tvb, pinfo, parent_tree);
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}
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return tvb_length(tvb);
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}
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static gboolean
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dissect_udt_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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conversation_t *conv;
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/* Must have at least 20 bytes */
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if (tvb_reported_length(tvb) < 20)
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return 0;
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/* detect handshake control packet */
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if (tvb_get_ntohl(tvb, 0) != (0x80000000 | UDT_PACKET_TYPE_HANDSHAKE))
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return FALSE;
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/* must be version 4 */
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if ((tvb_get_ntohl(tvb, 16) != 4))
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return FALSE;
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/* must be datagram or stream */
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if ((tvb_get_ntohl(tvb, 20) != UDT_HANDSHAKE_TYPE_DGRAM)
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&& (tvb_get_ntohl(tvb, 20) != UDT_HANDSHAKE_TYPE_STREAM))
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return FALSE;
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2013-10-13 19:56:52 +00:00
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2013-08-15 03:47:37 +00:00
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conv = find_or_create_conversation(pinfo);
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conversation_set_dissector(conv, udt_handle);
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dissect_udt(tvb, pinfo, tree, data);
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return TRUE;
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}
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void proto_register_udt(void)
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{
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expert_module_t *expert_udt;
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static hf_register_info hf[] = {
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{&hf_udt_iscontrol, {
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"Type", "udt.iscontrol", FT_UINT32,
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BASE_DEC,
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VALS(udt_types), 0x80000000, NULL, HFILL}},
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{&hf_udt_type, {
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"Type", "udt.type", FT_UINT16, BASE_HEX,
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VALS(udt_packet_types), 0x7fff, NULL, HFILL}},
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{&hf_udt_seqno, {
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"Sequence Number", "udt.seqno", FT_UINT32,
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BASE_DEC,
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NULL, 0x7fffffff, NULL, HFILL}},
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{&hf_udt_addinfo, {
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"Additional Info", "udt.addinfo", FT_UINT32,
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BASE_DEC,
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NULL, 0, NULL, HFILL}},
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{&hf_udt_msgno, {
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"Message Number", "udt.msgno", FT_UINT32,
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BASE_DEC,
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NULL, 0x1fffffff, NULL, HFILL}},
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{&hf_udt_msgno_first, {
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"First Indicator", "udt.msg.first",
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FT_UINT32, BASE_DEC,
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NULL, 0x80000000, NULL, HFILL}},
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{&hf_udt_msgno_last, {
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|
|
|
"Last Indicator", "udt.msg.last",
|
|
|
|
FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0x40000000, NULL, HFILL}},
|
|
|
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|
|
|
|
{&hf_udt_msgno_inorder, {
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|
|
|
"In-Order Indicator", "udt.msg.order",
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|
|
|
FT_UINT32, BASE_DEC,
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|
|
|
NULL, 0x20000000, NULL, HFILL}},
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|
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|
|
|
|
{&hf_udt_timestamp, {
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|
"Timestamp", "udt.timestamp", FT_UINT32,
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|
|
|
BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
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|
|
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|
|
|
|
{&hf_udt_id, {
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|
|
"ID", "udt.id", FT_UINT32, BASE_HEX,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_ack_seqno, {
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|
"Ack Sequence Number", "udt.ack_seqno",
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|
|
|
FT_UINT32, BASE_DEC,
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|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_ackno, {
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|
|
|
"Ack Number", "udt.ackno", FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_rtt, {
|
|
|
|
"RTT (microseconds)", "udt.rtt", FT_UINT32,
|
|
|
|
BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_rttvar, {
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|
|
|
"RTT Variance (microseconds)", "udt.rttvar",
|
|
|
|
FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_bufavail, {
|
|
|
|
"Buffer Available (packets)", "udt.rttvar",
|
|
|
|
FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_rate, {
|
|
|
|
"Rate (packets/second)", "udt.rate", FT_UINT32,
|
|
|
|
BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_linkcap, {
|
|
|
|
"Link Capacity (packets/second)",
|
|
|
|
"udt.linkcap", FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_version, {
|
|
|
|
"Version", "udt.hs.version",
|
|
|
|
FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_type, {
|
|
|
|
"Type", "udt.hs.type", FT_UINT32,
|
|
|
|
BASE_DEC,
|
|
|
|
VALS(udt_handshake_types), 0, NULL,
|
|
|
|
HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_isn, {
|
|
|
|
"Initial Sequence Number",
|
|
|
|
"udt.hs.isn", FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_mtu, {
|
|
|
|
"MTU", "udt.hs.mtu", FT_UINT32,
|
|
|
|
BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_flow_window, {
|
|
|
|
"Flow Window",
|
|
|
|
"udt.hs.flow_window",
|
|
|
|
FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_reqtype, {
|
|
|
|
"Requested Type", "udt.hs.reqtype",
|
|
|
|
FT_INT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_id, {
|
|
|
|
"ID", "udt.hs.id", FT_UINT32, BASE_DEC,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_cookie, {
|
|
|
|
"SYN Cookie", "udt.hs.cookie",
|
|
|
|
FT_UINT32, BASE_HEX,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
|
|
|
|
{&hf_udt_handshake_peerip, {
|
|
|
|
"Peer IP Address", "udt.hs.peerip",
|
|
|
|
FT_BYTES, BASE_NONE,
|
|
|
|
NULL, 0, NULL, HFILL}},
|
|
|
|
};
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_udt,
|
|
|
|
};
|
|
|
|
|
|
|
|
static ei_register_info ei[] = {
|
|
|
|
{ &ei_udt_nak_seqno,
|
|
|
|
{ "udt.nak_seqno", PI_SEQUENCE, PI_NOTE,
|
|
|
|
"Missing Sequence Number(s)", EXPFILL }},
|
|
|
|
};
|
|
|
|
|
|
|
|
proto_udt = proto_register_protocol("UDT Protocol", "UDT", "udt");
|
|
|
|
proto_register_field_array(proto_udt, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
|
|
expert_udt = expert_register_protocol(proto_udt);
|
|
|
|
expert_register_field_array(expert_udt, ei, array_length(ei));
|
|
|
|
}
|
|
|
|
|
|
|
|
void proto_reg_handoff_udt(void)
|
|
|
|
{
|
|
|
|
data_handle = find_dissector("data");
|
|
|
|
udt_handle = new_create_dissector_handle(dissect_udt, proto_udt);
|
|
|
|
|
|
|
|
heur_dissector_add("udp", dissect_udt_heur, proto_udt);
|
|
|
|
dissector_add_handle("udp.port", udt_handle);
|
|
|
|
}
|