9bcac48403
Started by grepping call_dissector_with_data, call_dissector_only and call_dissector and traced the handles passed into them to a find_dissector within the dissector. Then replaced find_dissector with find_dissector_add_dependency and added the protocol id from the dissector. "data" dissector was not considered to be a dependency. Change-Id: I15d0d77301306587ef8e7af5876e74231816890d Reviewed-on: https://code.wireshark.org/review/14509 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
468 lines
17 KiB
C
468 lines
17 KiB
C
/* packet-xot.c
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* Routines for X.25 over TCP dissection (RFC 1613)
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*
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* Copyright 2000, Paul Ionescu <paul@acorp.ro>
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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 "packet-tcp.h"
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#include <epan/prefs.h>
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#define TCP_PORT_XOT 1998
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#define XOT_HEADER_LENGTH 4
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#define XOT_VERSION 0
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#define XOT_PVC_SETUP 0xF5
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/* Some X25 macros from packet-x25.c - some adapted code as well below */
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#define X25_MIN_HEADER_LENGTH 3
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#define X25_MIN_M128_HEADER_LENGTH 4
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#define X25_NONDATA_BIT 0x01
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#define PACKET_IS_DATA(type) (!(type & X25_NONDATA_BIT))
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#define X25_MBIT_MOD8 0x10
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#define X25_MBIT_MOD128 0x01
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void proto_register_xot(void);
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void proto_reg_handoff_xot(void);
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static const value_string vals_x25_type[] = {
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{ XOT_PVC_SETUP, "PVC Setup" },
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{ 0, NULL}
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};
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static const value_string xot_pvc_status_vals[] = {
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{ 0x00, "Waiting to connect" },
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{ 0x08, "Destination disconnected" },
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{ 0x09, "PVC/TCP connection refused" },
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{ 0x0A, "PVC/TCP routing error" },
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{ 0x0B, "PVC/TCP connect timed out" },
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{ 0x10, "Trying to connect via TCP" },
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{ 0x11, "Awaiting PVC-SETUP reply" },
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{ 0x12, "Connected" },
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{ 0x13, "No such destination interface" },
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{ 0x14, "Destination interface is not up" },
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{ 0x15, "Non-X.25 destination interface" },
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{ 0x16, "No such destination PVC" },
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{ 0x17, "Destination PVC configuration mismatch" },
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{ 0x18, "Mismatched flow control values" },
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{ 0x19, "Can't support flow control values" },
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{ 0x1A, "PVC setup protocol error" },
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{ 0, NULL}
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};
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static gint proto_xot = -1;
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static gint ett_xot = -1;
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static gint hf_xot_version = -1;
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static gint hf_xot_length = -1;
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static gint hf_x25_gfi = -1;
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static gint hf_x25_lcn = -1;
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static gint hf_x25_type = -1;
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static gint hf_xot_pvc_version = -1;
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static gint hf_xot_pvc_status = -1;
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static gint hf_xot_pvc_init_itf_name_len = -1;
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static gint hf_xot_pvc_init_lcn = -1;
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static gint hf_xot_pvc_resp_itf_name_len = -1;
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static gint hf_xot_pvc_resp_lcn = -1;
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static gint hf_xot_pvc_send_inc_window = -1;
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static gint hf_xot_pvc_send_out_window = -1;
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static gint hf_xot_pvc_send_inc_pkt_size = -1;
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static gint hf_xot_pvc_send_out_pkt_size = -1;
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static gint hf_xot_pvc_init_itf_name = -1;
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static gint hf_xot_pvc_resp_itf_name = -1;
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static dissector_handle_t xot_handle;
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static dissector_handle_t x25_handle;
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/* desegmentation of X.25 over multiple TCP */
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static gboolean xot_desegment = TRUE;
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/* desegmentation of X.25 packet sequences */
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static gboolean x25_desegment = FALSE;
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static guint get_xot_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb,
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int offset, void *data _U_)
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{
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guint16 plen;
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int remain = tvb_captured_length_remaining(tvb, offset);
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if ( remain < XOT_HEADER_LENGTH){
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/* We did not get the data we asked for, use up what we can */
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return remain;
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}
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/*
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* Get the length of the X.25-over-TCP packet.
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*/
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plen = tvb_get_ntohs(tvb, offset + 2);
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return XOT_HEADER_LENGTH + plen;
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}
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static guint get_xot_pdu_len_mult(packet_info *pinfo _U_, tvbuff_t *tvb,
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int offset, void *data _U_)
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{
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int offset_before = offset; /* offset where we start this test */
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int offset_next = offset + XOT_HEADER_LENGTH + X25_MIN_HEADER_LENGTH;
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int tvb_len;
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while (tvb_len = tvb_captured_length_remaining(tvb, offset), tvb_len>0){
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guint16 plen = 0;
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int modulo;
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guint16 bytes0_1;
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guint8 pkt_type;
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gboolean m_bit_set;
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int offset_x25 = offset + XOT_HEADER_LENGTH;
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/* Minimum where next starts */
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offset_next = offset_x25 + X25_MIN_HEADER_LENGTH;
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if (tvb_len < XOT_HEADER_LENGTH) {
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return offset_next-offset_before;
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}
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/*
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* Get the length of the current X.25-over-TCP packet.
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*/
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plen = get_xot_pdu_len(pinfo, tvb, offset, NULL);
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offset_next = offset + plen;
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/* Make sure we have enough data */
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if (tvb_len < plen){
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return offset_next-offset_before;
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}
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/*Some minor code copied from packet-x25.c */
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bytes0_1 = tvb_get_ntohs(tvb, offset_x25+0);
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pkt_type = tvb_get_guint8(tvb, offset_x25+2);
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/* If this is the first packet and it is not data, no sequence needed */
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if (offset == offset_before && !PACKET_IS_DATA(pkt_type)) {
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return offset_next-offset_before;
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}
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/* Check for data, there can be X25 control packets in the X25 data */
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if (PACKET_IS_DATA(pkt_type)){
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modulo = ((bytes0_1 & 0x2000) ? 128 : 8);
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if (modulo == 8) {
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m_bit_set = pkt_type & X25_MBIT_MOD8;
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} else {
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m_bit_set = tvb_get_guint8(tvb, offset_x25+3) & X25_MBIT_MOD128;
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}
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if (!m_bit_set){
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/* We are done with this sequence when the mbit is no longer set */
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return offset_next-offset_before;
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}
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}
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offset = offset_next;
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offset_next += XOT_HEADER_LENGTH + X25_MIN_HEADER_LENGTH;
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}
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/* not enough data */
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pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
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return offset_next - offset_before;
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}
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static int dissect_xot_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int offset = 0;
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guint16 version;
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guint16 plen;
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guint8 pkt_type;
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proto_item *ti = NULL;
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proto_tree *xot_tree = NULL;
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tvbuff_t *next_tvb;
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/*
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* Dissect the X.25-over-TCP packet.
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*/
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "XOT");
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version = tvb_get_ntohs(tvb, offset + 0);
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plen = tvb_get_ntohs(tvb, offset + 2);
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col_add_fstr(pinfo->cinfo, COL_INFO, "XOT Version = %u, size = %u",
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version, plen);
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if (offset == 0 &&
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tvb_reported_length_remaining(tvb, offset) > XOT_HEADER_LENGTH + plen )
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col_append_fstr(pinfo->cinfo, COL_INFO, " TotX25: %d",
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tvb_reported_length_remaining(tvb, offset));
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if (tree) {
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ti = proto_tree_add_protocol_format(tree, proto_xot, tvb, offset, XOT_HEADER_LENGTH,
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"X.25 over TCP");
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xot_tree = proto_item_add_subtree(ti, ett_xot);
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proto_tree_add_uint(xot_tree, hf_xot_version, tvb, offset, 2, version);
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proto_tree_add_uint(xot_tree, hf_xot_length, tvb, offset + 2, 2, plen);
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}
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offset += XOT_HEADER_LENGTH;
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/*
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* Construct a tvbuff containing the amount of the payload we have
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* available. Make its reported length the amount of data in the
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* X.25-over-TCP packet.
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*/
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if (plen >= X25_MIN_HEADER_LENGTH) {
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pkt_type = tvb_get_guint8(tvb, offset + 2);
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if (pkt_type == XOT_PVC_SETUP) {
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guint init_itf_name_len, resp_itf_name_len, pkt_size;
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gint hdr_offset = offset;
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col_set_str(pinfo->cinfo, COL_INFO, "XOT PVC Setup");
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proto_item_set_len(ti, XOT_HEADER_LENGTH + plen);
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/* These fields are in overlay with packet-x25.c */
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proto_tree_add_item(xot_tree, hf_x25_gfi, tvb, hdr_offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(xot_tree, hf_x25_lcn, tvb, hdr_offset, 2, ENC_BIG_ENDIAN);
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hdr_offset += 2;
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proto_tree_add_item(xot_tree, hf_x25_type, tvb, hdr_offset, 1, ENC_BIG_ENDIAN);
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hdr_offset += 1;
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proto_tree_add_item(xot_tree, hf_xot_pvc_version, tvb, hdr_offset, 1, ENC_BIG_ENDIAN);
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hdr_offset += 1;
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proto_tree_add_item(xot_tree, hf_xot_pvc_status, tvb, hdr_offset, 1, ENC_BIG_ENDIAN);
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hdr_offset += 1;
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proto_tree_add_item(xot_tree, hf_xot_pvc_init_itf_name_len, tvb, hdr_offset, 1, ENC_BIG_ENDIAN);
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init_itf_name_len = tvb_get_guint8(tvb, hdr_offset);
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hdr_offset += 1;
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proto_tree_add_item(xot_tree, hf_xot_pvc_init_lcn, tvb, hdr_offset, 2, ENC_BIG_ENDIAN);
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hdr_offset += 2;
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proto_tree_add_item(xot_tree, hf_xot_pvc_resp_itf_name_len, tvb, hdr_offset, 1, ENC_BIG_ENDIAN);
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resp_itf_name_len = tvb_get_guint8(tvb, hdr_offset);
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hdr_offset += 1;
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proto_tree_add_item(xot_tree, hf_xot_pvc_resp_lcn, tvb, hdr_offset, 2, ENC_BIG_ENDIAN);
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hdr_offset += 2;
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proto_tree_add_item(xot_tree, hf_xot_pvc_send_inc_window, tvb, hdr_offset, 1, ENC_BIG_ENDIAN);
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hdr_offset += 1;
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proto_tree_add_item(xot_tree, hf_xot_pvc_send_out_window, tvb, hdr_offset, 1, ENC_BIG_ENDIAN);
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hdr_offset += 1;
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pkt_size = 1 << tvb_get_guint8(tvb, hdr_offset);
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proto_tree_add_uint(xot_tree, hf_xot_pvc_send_inc_pkt_size, tvb, hdr_offset, 1, pkt_size);
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hdr_offset += 1;
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pkt_size = 1 << tvb_get_guint8(tvb, hdr_offset);
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proto_tree_add_uint(xot_tree, hf_xot_pvc_send_out_pkt_size, tvb, hdr_offset, 1, pkt_size);
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hdr_offset += 1;
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proto_tree_add_item(xot_tree, hf_xot_pvc_init_itf_name, tvb, hdr_offset, init_itf_name_len, ENC_ASCII|ENC_NA);
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hdr_offset += init_itf_name_len;
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proto_tree_add_item(xot_tree, hf_xot_pvc_resp_itf_name, tvb, hdr_offset, resp_itf_name_len, ENC_ASCII|ENC_NA);
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} else {
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next_tvb = tvb_new_subset(tvb, offset,
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MIN(plen, tvb_captured_length_remaining(tvb, offset)), plen);
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call_dissector(x25_handle, next_tvb, pinfo, tree);
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}
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}
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return tvb_captured_length(tvb);
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}
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static int dissect_xot_mult(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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int offset = 0;
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int len = get_xot_pdu_len_mult(pinfo, tvb, offset, NULL);
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tvbuff_t *next_tvb;
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int offset_max = offset+MIN(len,tvb_captured_length_remaining(tvb, offset));
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proto_item *ti;
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proto_tree *xot_tree;
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if (tree) {
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/* Special header to show segments */
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ti = proto_tree_add_protocol_format(tree, proto_xot, tvb, offset, offset_max-offset,
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"X.25 over TCP - X.25 Sequence");
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xot_tree = proto_item_add_subtree(ti, ett_xot);
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proto_tree_add_uint(xot_tree, hf_xot_length, tvb, offset, offset_max, len);
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}
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while (offset <= offset_max - XOT_HEADER_LENGTH){
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int plen = get_xot_pdu_len(pinfo, tvb, offset, NULL);
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next_tvb = tvb_new_subset(tvb, offset,plen, plen);
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/*MIN(plen,tvb_captured_length_remaining(tvb, offset)),plen*/
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dissect_xot_pdu(next_tvb, pinfo, tree, data);
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offset += plen;
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}
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return tvb_captured_length(tvb);
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}
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static int dissect_xot_tcp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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int tvb_len = tvb_captured_length(tvb);
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int len = 0;
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if (tvb_len >= 2 && tvb_get_ntohs(tvb,0) != XOT_VERSION) {
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return 0;
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}
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if (!x25_desegment || !xot_desegment){
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tcp_dissect_pdus(tvb, pinfo, tree, xot_desegment,
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XOT_HEADER_LENGTH,
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get_xot_pdu_len,
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dissect_xot_pdu, data);
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len=get_xot_pdu_len(pinfo, tvb, 0, NULL);
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} else {
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/* Use length version that "peeks" into X25, possibly several XOT packets */
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tcp_dissect_pdus(tvb, pinfo, tree, xot_desegment,
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XOT_HEADER_LENGTH,
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get_xot_pdu_len_mult,
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dissect_xot_mult, data);
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len=get_xot_pdu_len_mult(pinfo, tvb, 0, NULL);
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}
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/*As tcp_dissect_pdus will not report the success/failure, we have to compute
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again */
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if (len < XOT_HEADER_LENGTH) {
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/* TCP has reported bounds error */
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len = 0;
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} else if (tvb_len < XOT_HEADER_LENGTH) {
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pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
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len=tvb_len - XOT_HEADER_LENGTH; /* bytes missing */
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} else if (tvb_len < len) {
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if (x25_desegment){
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/* As the "fixed_len" is not fixed here, just request new segments */
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pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
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} else {
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pinfo->desegment_len = len - tvb_len;
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}
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len=tvb_len - len; /* bytes missing */
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}
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return len;
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_xot(void)
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{
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static hf_register_info hf[] = {
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{ &hf_xot_version,
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{ "Version", "xot.version", FT_UINT16, BASE_DEC,
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NULL, 0, "Version of X.25 over TCP protocol", HFILL }},
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{ &hf_xot_length,
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{ "Length", "xot.length", FT_UINT16, BASE_DEC,
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NULL, 0, "Length of X.25 over TCP packet", HFILL }},
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/* These fields are in overlay with packet-x25.c */
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{ &hf_x25_gfi,
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{ "GFI", "x25.gfi", FT_UINT16, BASE_DEC,
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NULL, 0xF000, "General Format Identifier", HFILL }},
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{ &hf_x25_lcn,
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{ "Logical Channel", "x25.lcn", FT_UINT16, BASE_DEC,
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NULL, 0x0FFF, "Logical Channel Number", HFILL }},
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{ &hf_x25_type,
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{ "Packet Type", "x25.type", FT_UINT8, BASE_HEX,
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VALS(vals_x25_type), 0x0, NULL, HFILL }},
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{ &hf_xot_pvc_version,
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{ "Version", "xot.pvc.version", FT_UINT8, BASE_HEX,
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NULL, 0, NULL, HFILL }},
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{ &hf_xot_pvc_status,
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{ "Status", "xot.pvc.status", FT_UINT8, BASE_HEX,
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VALS(xot_pvc_status_vals), 0, NULL, HFILL }},
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{ &hf_xot_pvc_init_itf_name_len,
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{ "Initiator interface name length", "xot.pvc.init_itf_name_len", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL }},
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{ &hf_xot_pvc_init_lcn,
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{ "Initiator LCN", "xot.pvc.init_lcn", FT_UINT8, BASE_DEC,
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NULL, 0, "Initiator Logical Channel Number", HFILL }},
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{ &hf_xot_pvc_resp_itf_name_len,
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{ "Responder interface name length", "xot.pvc.resp_itf_name_len", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL }},
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{ &hf_xot_pvc_resp_lcn,
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{ "Responder LCN", "xot.pvc.resp_lcn", FT_UINT16, BASE_DEC,
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NULL, 0, "Responder Logical Channel Number", HFILL }},
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|
|
{ &hf_xot_pvc_send_inc_window,
|
|
{ "Sender incoming window", "xot.pvc.send_inc_window", FT_UINT8, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_xot_pvc_send_out_window,
|
|
{ "Sender outgoing window", "xot.pvc.send_out_window", FT_UINT8, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_xot_pvc_send_inc_pkt_size,
|
|
{ "Sender incoming packet size", "xot.pvc.send_inc_pkt_size", FT_UINT8, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_xot_pvc_send_out_pkt_size,
|
|
{ "Sender outgoing packet size", "xot.pvc.send_out_pkt_size", FT_UINT8, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_xot_pvc_init_itf_name,
|
|
{ "Initiator interface name", "xot.pvc.init_itf_name", FT_STRING, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_xot_pvc_resp_itf_name,
|
|
{ "Responder interface name", "xot.pvc.resp_itf_name", FT_STRING, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_xot
|
|
};
|
|
module_t *xot_module;
|
|
|
|
proto_xot = proto_register_protocol("X.25 over TCP", "XOT", "xot");
|
|
proto_register_field_array(proto_xot, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
xot_handle = register_dissector("xot", dissect_xot_tcp_heur, proto_xot);
|
|
xot_module = prefs_register_protocol(proto_xot, NULL);
|
|
|
|
prefs_register_bool_preference(xot_module, "desegment",
|
|
"Reassemble X.25-over-TCP messages spanning multiple TCP segments",
|
|
"Whether the X.25-over-TCP dissector should reassemble messages spanning multiple TCP segments. "
|
|
"To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings",
|
|
&xot_desegment);
|
|
prefs_register_bool_preference(xot_module, "x25_desegment",
|
|
"Reassemble X.25 packets with More flag to enable safe X.25 reassembly",
|
|
"Whether the X.25-over-TCP dissector should reassemble all X.25 packets before calling the X25 dissector. "
|
|
"If the TCP packets arrive out-of-order, the X.25 reassembly can otherwise fail. "
|
|
"To use this option, you should also enable \"Reassemble X.25-over-TCP messages spanning multiple TCP segments\", \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings and \"Reassemble fragmented X.25 packets\" in the X.25 protocol settings.",
|
|
&x25_desegment);
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_xot(void)
|
|
{
|
|
dissector_add_uint("tcp.port", TCP_PORT_XOT, xot_handle);
|
|
|
|
x25_handle = find_dissector_add_dependency("x.25", proto_xot);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 3
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=3 tabstop=8 expandtab:
|
|
* :indentSize=3:tabSize=8:noTabs=true:
|
|
*/
|