feab79e328
svn path=/trunk/; revision=18196
2563 lines
78 KiB
C
2563 lines
78 KiB
C
/* packet-x25.c
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* Routines for X.25 packet disassembly
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* Olivier Abad <oabad@noos.fr>
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*
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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
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <glib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <epan/llcsaps.h>
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#include <epan/packet.h>
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#include <epan/circuit.h>
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#include <epan/reassemble.h>
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#include <epan/prefs.h>
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#include <epan/emem.h>
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#include <epan/nlpid.h>
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#include <epan/x264_prt_id.h>
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/*
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* Direction of packet.
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*/
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typedef enum {
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X25_FROM_DCE, /* DCE->DTE */
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X25_FROM_DTE, /* DTE->DCE */
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X25_UNKNOWN /* direction unknown */
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} x25_dir_t;
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/*
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* 0 for data packets, 1 for non-data packets.
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*/
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#define X25_NONDATA_BIT 0x01
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#define X25_CALL_REQUEST 0x0B
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#define X25_CALL_ACCEPTED 0x0F
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#define X25_CLEAR_REQUEST 0x13
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#define X25_CLEAR_CONFIRMATION 0x17
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#define X25_INTERRUPT 0x23
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#define X25_INTERRUPT_CONFIRMATION 0x27
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#define X25_RESET_REQUEST 0x1B
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#define X25_RESET_CONFIRMATION 0x1F
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#define X25_RESTART_REQUEST 0xFB
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#define X25_RESTART_CONFIRMATION 0xFF
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#define X25_REGISTRATION_REQUEST 0xF3
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#define X25_REGISTRATION_CONFIRMATION 0xF7
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#define X25_DIAGNOSTIC 0xF1
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#define X25_RR 0x01
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#define X25_RNR 0x05
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#define X25_REJ 0x09
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#define X25_DATA 0x00
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#define PACKET_IS_DATA(type) (!(type & X25_NONDATA_BIT))
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#define PACKET_TYPE_FC(type) (type & 0x1F)
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#define X25_MBIT_MOD8 0x10
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#define X25_MBIT_MOD128 0x01
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#define X25_ABIT 0x8000
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#define X25_QBIT 0x8000
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#define X25_DBIT 0x4000
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#define X25_FAC_CLASS_MASK 0xC0
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#define X25_FAC_CLASS_A 0x00
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#define X25_FAC_CLASS_B 0x40
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#define X25_FAC_CLASS_C 0x80
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#define X25_FAC_CLASS_D 0xC0
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#define X25_FAC_COMP_MARK 0x00
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#define X25_FAC_REVERSE 0x01
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#define X25_FAC_THROUGHPUT 0x02
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#define X25_FAC_CUG 0x03
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#define X25_FAC_CALLED_MODIF 0x08
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#define X25_FAC_CUG_OUTGOING_ACC 0x09
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#define X25_FAC_THROUGHPUT_MIN 0x0A
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#define X25_FAC_EXPRESS_DATA 0x0B
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#define X25_FAC_BILATERAL_CUG 0x41
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#define X25_FAC_PACKET_SIZE 0x42
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#define X25_FAC_WINDOW_SIZE 0x43
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#define X25_FAC_RPOA_SELECTION 0x44
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#define X25_FAC_TRANSIT_DELAY 0x49
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#define X25_FAC_CALL_TRANSFER 0xC3
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#define X25_FAC_CALLED_ADDR_EXT 0xC9
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#define X25_FAC_ETE_TRANSIT_DELAY 0xCA
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#define X25_FAC_CALLING_ADDR_EXT 0xCB
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#define X25_FAC_CALL_DEFLECT 0xD1
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#define X25_FAC_PRIORITY 0xD2
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static int proto_x25 = -1;
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static int hf_x25_gfi = -1;
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static int hf_x25_abit = -1;
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static int hf_x25_qbit = -1;
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static int hf_x25_dbit = -1;
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static int hf_x25_mod = -1;
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static int hf_x25_lcn = -1;
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static int hf_x25_type = -1;
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static int hf_x25_type_fc_mod8 = -1;
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static int hf_x25_type_data = -1;
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static int hf_x25_p_r_mod8 = -1;
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static int hf_x25_p_r_mod128 = -1;
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static int hf_x25_mbit_mod8 = -1;
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static int hf_x25_mbit_mod128 = -1;
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static int hf_x25_p_s_mod8 = -1;
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static int hf_x25_p_s_mod128 = -1;
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static gint ett_x25 = -1;
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static gint ett_x25_gfi = -1;
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static gint ett_x25_fac = -1;
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static gint ett_x25_fac_unknown = -1;
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static gint ett_x25_fac_mark = -1;
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static gint ett_x25_fac_reverse = -1;
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static gint ett_x25_fac_throughput = -1;
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static gint ett_x25_fac_cug = -1;
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static gint ett_x25_fac_called_modif = -1;
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static gint ett_x25_fac_cug_outgoing_acc = -1;
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static gint ett_x25_fac_throughput_min = -1;
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static gint ett_x25_fac_express_data = -1;
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static gint ett_x25_fac_bilateral_cug = -1;
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static gint ett_x25_fac_packet_size = -1;
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static gint ett_x25_fac_window_size = -1;
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static gint ett_x25_fac_rpoa_selection = -1;
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static gint ett_x25_fac_transit_delay = -1;
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static gint ett_x25_fac_call_transfer = -1;
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static gint ett_x25_fac_called_addr_ext = -1;
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static gint ett_x25_fac_ete_transit_delay = -1;
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static gint ett_x25_fac_calling_addr_ext = -1;
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static gint ett_x25_fac_call_deflect = -1;
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static gint ett_x25_fac_priority = -1;
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static gint ett_x25_user_data = -1;
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static gint ett_x25_segment = -1;
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static gint ett_x25_segments = -1;
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static gint hf_x25_segments = -1;
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static gint hf_x25_segment = -1;
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static gint hf_x25_segment_overlap = -1;
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static gint hf_x25_segment_overlap_conflict = -1;
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static gint hf_x25_segment_multiple_tails = -1;
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static gint hf_x25_segment_too_long_segment = -1;
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static gint hf_x25_segment_error = -1;
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static const value_string vals_modulo[] = {
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{ 1, "8" },
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{ 2, "128" },
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{ 0, NULL}
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};
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static const value_string vals_x25_type[] = {
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{ X25_CALL_REQUEST, "Call" },
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{ X25_CALL_ACCEPTED, "Call Accepted" },
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{ X25_CLEAR_REQUEST, "Clear" },
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{ X25_CLEAR_CONFIRMATION, "Clear Confirmation" },
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{ X25_INTERRUPT, "Interrupt" },
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{ X25_INTERRUPT_CONFIRMATION, "Interrupt Confirmation" },
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{ X25_RESET_REQUEST, "Reset" },
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{ X25_RESET_CONFIRMATION, "Reset Confirmation" },
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{ X25_RESTART_REQUEST, "Restart" },
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{ X25_RESTART_CONFIRMATION, "Restart Confirmation" },
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{ X25_REGISTRATION_REQUEST, "Registration" },
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{ X25_REGISTRATION_CONFIRMATION, "Registration Confirmation" },
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{ X25_DIAGNOSTIC, "Diagnostic" },
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{ X25_RR, "RR" },
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{ X25_RNR, "RNR" },
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{ X25_REJ, "REJ" },
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{ X25_DATA, "Data" },
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{ 0, NULL}
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};
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static struct true_false_string m_bit_tfs = {
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"More data follows",
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"End of data"
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};
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static const fragment_items x25_frag_items = {
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&ett_x25_segment,
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&ett_x25_segments,
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&hf_x25_segments,
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&hf_x25_segment,
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&hf_x25_segment_overlap,
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&hf_x25_segment_overlap_conflict,
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&hf_x25_segment_multiple_tails,
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&hf_x25_segment_too_long_segment,
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&hf_x25_segment_error,
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NULL,
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"segments"
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};
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static dissector_handle_t ip_handle;
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static dissector_handle_t clnp_handle;
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static dissector_handle_t ositp_handle;
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static dissector_handle_t qllc_handle;
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static dissector_handle_t data_handle;
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/* Preferences */
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static gboolean payload_is_qllc_sna = FALSE;
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static gboolean reassemble_x25 = TRUE;
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/* Reassembly of X.25 */
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static GHashTable *x25_segment_table = NULL;
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static GHashTable *x25_reassembled_table = NULL;
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static dissector_table_t x25_subdissector_table;
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static heur_dissector_list_t x25_heur_subdissector_list;
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static void
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x25_hash_add_proto_start(guint16 vc, guint32 frame, dissector_handle_t dissect)
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{
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circuit_t *circuit;
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/*
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* Is there already a circuit with this VC number?
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*/
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circuit = find_circuit(CT_X25, vc, frame);
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if (circuit != NULL) {
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/*
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* Yes - close it, as we're creating a new one.
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*/
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close_circuit(circuit, frame - 1);
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}
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/*
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* Set up a new circuit.
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*/
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circuit = circuit_new(CT_X25, vc, frame);
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/*
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* Set its dissector.
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*/
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circuit_set_dissector(circuit, dissect);
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}
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static void
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x25_hash_add_proto_end(guint16 vc, guint32 frame)
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{
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circuit_t *circuit;
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/*
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* Try to find the circuit.
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*/
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circuit = find_circuit(CT_X25, vc, frame);
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/*
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* If we succeeded, close it.
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*/
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if (circuit != NULL)
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close_circuit(circuit, frame);
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}
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static const char *clear_code(unsigned char code)
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{
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static char *buffer;
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if (code == 0x00 || (code & 0x80) == 0x80)
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return "DTE Originated";
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if (code == 0x01)
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return "Number Busy";
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if (code == 0x03)
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return "Invalid Facility Requested";
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if (code == 0x05)
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return "Network Congestion";
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if (code == 0x09)
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return "Out Of Order";
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if (code == 0x0B)
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return "Access Barred";
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if (code == 0x0D)
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return "Not Obtainable";
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if (code == 0x11)
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return "Remote Procedure Error";
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if (code == 0x13)
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return "Local Procedure Error";
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if (code == 0x15)
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return "RPOA Out Of Order";
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if (code == 0x19)
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return "Reverse Charging Acceptance Not Subscribed";
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if (code == 0x21)
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return "Incompatible Destination";
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if (code == 0x29)
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return "Fast Select Acceptance Not Subscribed";
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if (code == 0x39)
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return "Destination Absent";
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buffer=ep_alloc(32);
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g_snprintf(buffer, 32, "Unknown %02X", code);
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return buffer;
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}
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static const char *clear_diag(unsigned char code)
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{
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static char *buffer;
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if (code == 0)
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return "No additional information";
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if (code == 1)
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return "Invalid P(S)";
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if (code == 2)
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return "Invalid P(R)";
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if (code == 16)
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return "Packet type invalid";
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if (code == 17)
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return "Packet type invalid for state r1";
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if (code == 18)
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return "Packet type invalid for state r2";
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if (code == 19)
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return "Packet type invalid for state r3";
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if (code == 20)
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return "Packet type invalid for state p1";
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if (code == 21)
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return "Packet type invalid for state p2";
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if (code == 22)
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return "Packet type invalid for state p3";
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if (code == 23)
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return "Packet type invalid for state p4";
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if (code == 24)
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return "Packet type invalid for state p5";
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if (code == 25)
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return "Packet type invalid for state p6";
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if (code == 26)
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return "Packet type invalid for state p7";
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if (code == 27)
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return "Packet type invalid for state d1";
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if (code == 28)
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return "Packet type invalid for state d2";
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if (code == 29)
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return "Packet type invalid for state d3";
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if (code == 32)
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return "Packet not allowed";
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if (code == 33)
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return "Unidentifiable packet";
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if (code == 34)
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return "Call on one-way logical channel";
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if (code == 35)
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return "Invalid packet type on a PVC";
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if (code == 36)
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return "Packet on unassigned LC";
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if (code == 37)
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return "Reject not subscribed to";
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if (code == 38)
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return "Packet too short";
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if (code == 39)
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return "Packet too long";
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if (code == 40)
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return "Invalid general format identifier";
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if (code == 41)
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return "Restart/registration packet with nonzero bits";
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if (code == 42)
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return "Packet type not compatible with facility";
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if (code == 43)
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return "Unauthorised interrupt confirmation";
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if (code == 44)
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return "Unauthorised interrupt";
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if (code == 45)
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return "Unauthorised reject";
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if (code == 48)
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return "Time expired";
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if (code == 49)
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return "Time expired for incoming call";
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if (code == 50)
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return "Time expired for clear indication";
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if (code == 51)
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return "Time expired for reset indication";
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if (code == 52)
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return "Time expired for restart indication";
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if (code == 53)
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return "Time expired for call deflection";
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if (code == 64)
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return "Call set-up/clearing or registration pb.";
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if (code == 65)
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return "Facility/registration code not allowed";
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if (code == 66)
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return "Facility parameter not allowed";
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if (code == 67)
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return "Invalid called DTE address";
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if (code == 68)
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return "Invalid calling DTE address";
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if (code == 69)
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return "Invalid facility/registration length";
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if (code == 70)
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return "Incoming call barred";
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if (code == 71)
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return "No logical channel available";
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if (code == 72)
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return "Call collision";
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if (code == 73)
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return "Duplicate facility requested";
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if (code == 74)
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return "Non zero address length";
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if (code == 75)
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return "Non zero facility length";
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if (code == 76)
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return "Facility not provided when expected";
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if (code == 77)
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return "Invalid CCITT-specified DTE facility";
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if (code == 78)
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return "Max. nb of call redir/defl. exceeded";
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if (code == 80)
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return "Miscellaneous";
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if (code == 81)
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return "Improper cause code from DTE";
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if (code == 82)
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return "Not aligned octet";
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if (code == 83)
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return "Inconsistent Q bit setting";
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if (code == 84)
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return "NUI problem";
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if (code == 112)
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return "International problem";
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if (code == 113)
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return "Remote network problem";
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if (code == 114)
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return "International protocol problem";
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if (code == 115)
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return "International link out of order";
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if (code == 116)
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return "International link busy";
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if (code == 117)
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return "Transit network facility problem";
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if (code == 118)
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return "Remote network facility problem";
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if (code == 119)
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return "International routing problem";
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if (code == 120)
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return "Temporary routing problem";
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if (code == 121)
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return "Unknown called DNIC";
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if (code == 122)
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return "Maintenance action";
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if (code == 144)
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return "Timer expired or retransmission count surpassed";
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if (code == 145)
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return "Timer expired or retransmission count surpassed for INTERRUPT";
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if (code == 146)
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return "Timer expired or retransmission count surpassed for DATA "
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"packet transmission";
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if (code == 147)
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return "Timer expired or retransmission count surpassed for REJECT";
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if (code == 160)
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return "DTE-specific signals";
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if (code == 161)
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return "DTE operational";
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if (code == 162)
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return "DTE not operational";
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if (code == 163)
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return "DTE resource constraint";
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if (code == 164)
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return "Fast select not subscribed";
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if (code == 165)
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return "Invalid partially full DATA packet";
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if (code == 166)
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return "D-bit procedure not supported";
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if (code == 167)
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return "Registration/Cancellation confirmed";
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if (code == 224)
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return "OSI network service problem";
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if (code == 225)
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return "Disconnection (transient condition)";
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if (code == 226)
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return "Disconnection (permanent condition)";
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if (code == 227)
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return "Connection rejection - reason unspecified (transient "
|
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"condition)";
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if (code == 228)
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return "Connection rejection - reason unspecified (permanent "
|
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"condition)";
|
|
if (code == 229)
|
|
return "Connection rejection - quality of service not available "
|
|
"transient condition)";
|
|
if (code == 230)
|
|
return "Connection rejection - quality of service not available "
|
|
"permanent condition)";
|
|
if (code == 231)
|
|
return "Connection rejection - NSAP unreachable (transient condition)";
|
|
if (code == 232)
|
|
return "Connection rejection - NSAP unreachable (permanent condition)";
|
|
if (code == 233)
|
|
return "reset - reason unspecified";
|
|
if (code == 234)
|
|
return "reset - congestion";
|
|
if (code == 235)
|
|
return "Connection rejection - NSAP address unknown (permanent "
|
|
"condition)";
|
|
if (code == 240)
|
|
return "Higher layer initiated";
|
|
if (code == 241)
|
|
return "Disconnection - normal";
|
|
if (code == 242)
|
|
return "Disconnection - abnormal";
|
|
if (code == 243)
|
|
return "Disconnection - incompatible information in user data";
|
|
if (code == 244)
|
|
return "Connection rejection - reason unspecified (transient "
|
|
"condition)";
|
|
if (code == 245)
|
|
return "Connection rejection - reason unspecified (permanent "
|
|
"condition)";
|
|
if (code == 246)
|
|
return "Connection rejection - quality of service not available "
|
|
"(transient condition)";
|
|
if (code == 247)
|
|
return "Connection rejection - quality of service not available "
|
|
"(permanent condition)";
|
|
if (code == 248)
|
|
return "Connection rejection - incompatible information in user data";
|
|
if (code == 249)
|
|
return "Connection rejection - unrecognizable protocol indentifier "
|
|
"in user data";
|
|
if (code == 250)
|
|
return "Reset - user resynchronization";
|
|
|
|
buffer=ep_alloc(32);
|
|
g_snprintf(buffer, 32, "Unknown %d", code);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
static const char *reset_code(unsigned char code)
|
|
{
|
|
static char *buffer;
|
|
|
|
if (code == 0x00 || (code & 0x80) == 0x80)
|
|
return "DTE Originated";
|
|
if (code == 0x01)
|
|
return "Out of order";
|
|
if (code == 0x03)
|
|
return "Remote Procedure Error";
|
|
if (code == 0x05)
|
|
return "Local Procedure Error";
|
|
if (code == 0x07)
|
|
return "Network Congestion";
|
|
if (code == 0x09)
|
|
return "Remote DTE operational";
|
|
if (code == 0x0F)
|
|
return "Network operational";
|
|
if (code == 0x11)
|
|
return "Incompatible Destination";
|
|
if (code == 0x1D)
|
|
return "Network out of order";
|
|
|
|
buffer=ep_alloc(32);
|
|
g_snprintf(buffer, 32, "Unknown %02X", code);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
static const char *restart_code(unsigned char code)
|
|
{
|
|
static char *buffer;
|
|
|
|
if (code == 0x00 || (code & 0x80) == 0x80)
|
|
return "DTE Originated";
|
|
if (code == 0x01)
|
|
return "Local Procedure Error";
|
|
if (code == 0x03)
|
|
return "Network Congestion";
|
|
if (code == 0x07)
|
|
return "Network Operational";
|
|
if (code == 0x7F)
|
|
return "Registration/cancellation confirmed";
|
|
|
|
buffer=ep_alloc(32);
|
|
g_snprintf(buffer, 32, "Unknown %02X", code);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
static const char *registration_code(unsigned char code)
|
|
{
|
|
static char *buffer;
|
|
|
|
if (code == 0x03)
|
|
return "Invalid facility request";
|
|
if (code == 0x05)
|
|
return "Network congestion";
|
|
if (code == 0x13)
|
|
return "Local procedure error";
|
|
if (code == 0x7F)
|
|
return "Registration/cancellation confirmed";
|
|
|
|
buffer=ep_alloc(32);
|
|
g_snprintf(buffer, 32, "Unknown %02X", code);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
static void
|
|
dump_facilities(proto_tree *tree, int *offset, tvbuff_t *tvb)
|
|
{
|
|
guint8 fac, byte1, byte2, byte3;
|
|
guint32 len; /* facilities length */
|
|
proto_item *ti=0;
|
|
proto_tree *fac_tree = 0;
|
|
proto_tree *fac_subtree;
|
|
|
|
len = tvb_get_guint8(tvb, *offset);
|
|
if (len && tree) {
|
|
ti = proto_tree_add_text(tree, tvb, *offset, len + 1,
|
|
"Facilities");
|
|
fac_tree = proto_item_add_subtree(ti, ett_x25_fac);
|
|
proto_tree_add_text(fac_tree, tvb, *offset, 1,
|
|
"Facilities length: %d", len);
|
|
}
|
|
(*offset)++;
|
|
|
|
while (len > 0) {
|
|
fac = tvb_get_guint8(tvb, *offset);
|
|
switch(fac & X25_FAC_CLASS_MASK) {
|
|
case X25_FAC_CLASS_A:
|
|
switch (fac) {
|
|
case X25_FAC_COMP_MARK:
|
|
if (fac_tree)
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1,
|
|
"Code : 00 (Marker)");
|
|
switch (tvb_get_guint8(tvb, *offset + 1)) {
|
|
case 0x00:
|
|
if (fac_tree) {
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_mark);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter : 00 (Network complementary "
|
|
"services - calling DTE)");
|
|
}
|
|
break;
|
|
case 0xFF:
|
|
if (fac_tree) {
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_mark);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter : FF (Network complementary "
|
|
"services - called DTE)");
|
|
}
|
|
break;
|
|
case 0x0F:
|
|
if (fac_tree) {
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_mark);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter : 0F (DTE complementary "
|
|
"services)");
|
|
}
|
|
break;
|
|
default:
|
|
if (fac_tree) {
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_mark);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter : %02X (Unknown marker)",
|
|
tvb_get_guint8(tvb, *offset+1));
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
case X25_FAC_REVERSE:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Reverse charging / Fast select)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_reverse);
|
|
byte1 = tvb_get_guint8(tvb, *offset + 1);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter : %02X", byte1);
|
|
if (byte1 & 0xC0)
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"11.. .... = Fast select with restriction");
|
|
else if (byte1 & 0x80)
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"10.. .... = Fast select - no restriction");
|
|
else
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"00.. .... = Fast select not requested");
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
decode_boolean_bitfield(byte1, 0x01, 1*8,
|
|
"Reverse charging requested",
|
|
"Reverse charging not requested"));
|
|
}
|
|
break;
|
|
case X25_FAC_THROUGHPUT:
|
|
if (fac_tree) {
|
|
char *tmpbuf;
|
|
|
|
tmpbuf=ep_alloc(80);
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Throughput class negotiation)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_throughput);
|
|
byte1 = tvb_get_guint8(tvb, *offset + 1);
|
|
switch (byte1 >> 4)
|
|
{
|
|
case 3:
|
|
case 4:
|
|
case 5:
|
|
case 6:
|
|
case 7:
|
|
case 8:
|
|
case 9:
|
|
case 10:
|
|
case 11:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (%d bps)",
|
|
75*(1<<((byte1 >> 4)-3)));
|
|
break;
|
|
case 12:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (48000 bps)");
|
|
break;
|
|
case 13:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (64000 bps)");
|
|
break;
|
|
default:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (Reserved)");
|
|
}
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
decode_numeric_bitfield(byte1, 0xF0, 1*8, tmpbuf));
|
|
switch (byte1 & 0x0F)
|
|
{
|
|
case 3:
|
|
case 4:
|
|
case 5:
|
|
case 6:
|
|
case 7:
|
|
case 8:
|
|
case 9:
|
|
case 10:
|
|
case 11:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (%d bps)",
|
|
75*(1<<((byte1 & 0x0F)-3)));
|
|
break;
|
|
case 12:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (48000 bps)");
|
|
break;
|
|
case 13:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (64000 bps)");
|
|
break;
|
|
default:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (Reserved)");
|
|
}
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
decode_numeric_bitfield(byte1, 0x0F, 1*8, tmpbuf));
|
|
}
|
|
break;
|
|
case X25_FAC_CUG:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Closed user group selection)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_cug);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Closed user group: %02X", tvb_get_guint8(tvb, *offset+1));
|
|
}
|
|
break;
|
|
case X25_FAC_CALLED_MODIF:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Called address modified)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_called_modif);
|
|
proto_tree_add_text(fac_tree, tvb, *offset+1, 1,
|
|
"Parameter %02X", tvb_get_guint8(tvb, *offset+1));
|
|
}
|
|
break;
|
|
case X25_FAC_CUG_OUTGOING_ACC:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Closed user group with outgoing access selection)",
|
|
fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_cug_outgoing_acc);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Closed user group: %02X", tvb_get_guint8(tvb, *offset+1));
|
|
}
|
|
break;
|
|
case X25_FAC_THROUGHPUT_MIN:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Minimum throughput class)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_throughput_min);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter %02X", tvb_get_guint8(tvb, *offset+1));
|
|
}
|
|
break;
|
|
case X25_FAC_EXPRESS_DATA:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Negotiation of express data)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_express_data);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter %02X", tvb_get_guint8(tvb, *offset+1));
|
|
}
|
|
break;
|
|
default:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1,
|
|
"Code : %02X (Unknown class A)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_unknown);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Parameter %02X", tvb_get_guint8(tvb, *offset+1));
|
|
}
|
|
break;
|
|
}
|
|
(*offset) += 2;
|
|
len -= 2;
|
|
break;
|
|
case X25_FAC_CLASS_B:
|
|
switch (fac) {
|
|
case X25_FAC_BILATERAL_CUG:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Bilateral closed user group selection)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_bilateral_cug);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 2,
|
|
"Bilateral CUG: %04X",
|
|
tvb_get_ntohs(tvb, *offset+1));
|
|
}
|
|
break;
|
|
case X25_FAC_PACKET_SIZE:
|
|
if (fac_tree)
|
|
{
|
|
char *tmpbuf;
|
|
|
|
tmpbuf=ep_alloc(80);
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Packet size)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_packet_size);
|
|
byte1 = tvb_get_guint8(tvb, *offset + 1);
|
|
switch (byte1)
|
|
{
|
|
case 0x04:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (16)");
|
|
break;
|
|
case 0x05:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (32)");
|
|
break;
|
|
case 0x06:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (64)");
|
|
break;
|
|
case 0x07:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (128)");
|
|
break;
|
|
case 0x08:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (256)");
|
|
break;
|
|
case 0x0D:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (512)");
|
|
break;
|
|
case 0x0C:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (1024)");
|
|
break;
|
|
case 0x0E:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (2048)");
|
|
break;
|
|
case 0x0F:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (4096)");
|
|
break;
|
|
default:
|
|
g_snprintf(tmpbuf, 80, "From the called DTE : %%u (Unknown)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
decode_numeric_bitfield(byte1, 0x0F, 1*8, tmpbuf));
|
|
|
|
byte2 = tvb_get_guint8(tvb, *offset + 1);
|
|
switch (byte2)
|
|
{
|
|
case 0x04:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (16)");
|
|
break;
|
|
case 0x05:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (32)");
|
|
break;
|
|
case 0x06:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (64)");
|
|
break;
|
|
case 0x07:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (128)");
|
|
break;
|
|
case 0x08:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (256)");
|
|
break;
|
|
case 0x0D:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (512)");
|
|
break;
|
|
case 0x0C:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (1024)");
|
|
break;
|
|
case 0x0E:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (2048)");
|
|
break;
|
|
case 0x0F:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (4096)");
|
|
break;
|
|
default:
|
|
g_snprintf(tmpbuf, 80, "From the calling DTE : %%u (Unknown)");
|
|
break;
|
|
}
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
decode_numeric_bitfield(byte2, 0x0F, 1*8, tmpbuf));
|
|
}
|
|
break;
|
|
case X25_FAC_WINDOW_SIZE:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Window size)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_window_size);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
decode_numeric_bitfield(tvb_get_guint8(tvb, *offset+1),
|
|
0x7F, 1*8, "From the called DTE: %u"));
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
decode_numeric_bitfield(tvb_get_guint8(tvb, *offset+2),
|
|
0x7F, 1*8, "From the calling DTE: %u"));
|
|
}
|
|
break;
|
|
case X25_FAC_RPOA_SELECTION:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(RPOA selection)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_rpoa_selection);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 2,
|
|
"Data network identification code : %04X",
|
|
tvb_get_ntohs(tvb, *offset+1));
|
|
}
|
|
break;
|
|
case X25_FAC_TRANSIT_DELAY:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Transit delay selection and indication)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_transit_delay);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 2,
|
|
"Transit delay: %d ms",
|
|
tvb_get_ntohs(tvb, *offset+1));
|
|
}
|
|
break;
|
|
default:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1,
|
|
"Code : %02X (Unknown class B)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_unknown);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 2,
|
|
"Parameter %04X", tvb_get_ntohs(tvb, *offset+1));
|
|
}
|
|
break;
|
|
}
|
|
(*offset) += 3;
|
|
len -= 3;
|
|
break;
|
|
case X25_FAC_CLASS_C:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1,
|
|
"Code : %02X (Unknown class C)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_unknown);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 3,
|
|
"Parameter %06X",
|
|
tvb_get_ntoh24(tvb, *offset+1));
|
|
}
|
|
(*offset) += 4;
|
|
len -= 4;
|
|
break;
|
|
case X25_FAC_CLASS_D:
|
|
switch (fac) {
|
|
case X25_FAC_CALL_TRANSFER:
|
|
if (fac_tree) {
|
|
int i;
|
|
char *tmpbuf;
|
|
|
|
tmpbuf=ep_alloc(258);
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Call redirection or deflection notification)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_call_transfer);
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
if (byte1 < 2) {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Bogus length : %d", byte1);
|
|
return;
|
|
} else {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Length : %u", byte1);
|
|
}
|
|
byte2 = tvb_get_guint8(tvb, *offset+2);
|
|
if ((byte2 & 0xC0) == 0xC0) {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : call deflection by the originally "
|
|
"called DTE address");
|
|
}
|
|
else {
|
|
switch (byte2) {
|
|
case 0x01:
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : originally called DTE busy");
|
|
break;
|
|
case 0x07:
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : call dist. within a hunt group");
|
|
break;
|
|
case 0x09:
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : originally called DTE out of order");
|
|
break;
|
|
case 0x0F:
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : systematic call redirection");
|
|
break;
|
|
default:
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : unknown");
|
|
break;
|
|
}
|
|
}
|
|
byte3 = tvb_get_guint8(tvb, *offset+3);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+3, 1,
|
|
"Number of semi-octets in DTE address : %u",
|
|
byte3);
|
|
for (i = 0; (i<byte3)&&(i<256); i++) {
|
|
if (i % 2 == 0) {
|
|
tmpbuf[i] = ((tvb_get_guint8(tvb, *offset+4+i/2) >> 4)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
} else {
|
|
tmpbuf[i] = (tvb_get_guint8(tvb, *offset+4+i/2)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
}
|
|
}
|
|
tmpbuf[i] = 0;
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+4, byte1 - 2,
|
|
"DTE address : %s", tmpbuf);
|
|
}
|
|
break;
|
|
case X25_FAC_CALLING_ADDR_EXT:
|
|
if (fac_tree) {
|
|
int i;
|
|
char *tmpbuf;
|
|
|
|
tmpbuf=ep_alloc(258);
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Calling address extension)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_calling_addr_ext);
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
if (byte1 < 1) {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Bogus length : %d", byte1);
|
|
return;
|
|
} else {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Length : %u", byte1);
|
|
}
|
|
byte2 = tvb_get_guint8(tvb, *offset+2) & 0x3F;
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Number of semi-octets in DTE address : %u", byte2);
|
|
for (i = 0; (i<byte2)&&(i<256) ; i++) {
|
|
if (i % 2 == 0) {
|
|
tmpbuf[i] = ((tvb_get_guint8(tvb, *offset+3+i/2) >> 4)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
} else {
|
|
tmpbuf[i] = (tvb_get_guint8(tvb, *offset+3+i/2)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
}
|
|
}
|
|
tmpbuf[i] = 0;
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+3, byte1 - 1,
|
|
"DTE address : %s", tmpbuf);
|
|
}
|
|
break;
|
|
case X25_FAC_CALLED_ADDR_EXT:
|
|
if (fac_tree) {
|
|
int i;
|
|
char *tmpbuf;
|
|
|
|
tmpbuf=ep_alloc(258);
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Called address extension)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_called_addr_ext);
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
if (byte1 < 1) {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Bogus length : %d", byte1);
|
|
return;
|
|
} else {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Length : %u", byte1);
|
|
}
|
|
byte2 = tvb_get_guint8(tvb, *offset+2) & 0x3F;
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Number of semi-octets in DTE address : %u", byte2);
|
|
for (i = 0; (i<byte2)&&(i<256) ; i++) {
|
|
if (i % 2 == 0) {
|
|
tmpbuf[i] = ((tvb_get_guint8(tvb, *offset+3+i/2) >> 4)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
} else {
|
|
tmpbuf[i] = (tvb_get_guint8(tvb, *offset+3+i/2)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
}
|
|
}
|
|
tmpbuf[i] = 0;
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+3, byte1 - 1,
|
|
"DTE address : %s", tmpbuf);
|
|
}
|
|
break;
|
|
case X25_FAC_ETE_TRANSIT_DELAY:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(End to end transit delay)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_ete_transit_delay);
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Length : %u", byte1);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, byte1, "Value");
|
|
}
|
|
break;
|
|
case X25_FAC_CALL_DEFLECT:
|
|
if (fac_tree) {
|
|
int i;
|
|
char *tmpbuf;
|
|
|
|
tmpbuf=ep_alloc(258);
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1, "Code : %02X "
|
|
"(Call deflection selection)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti,
|
|
ett_x25_fac_call_deflect);
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
if (byte1 < 2) {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Bogus length : %d", byte1);
|
|
return;
|
|
} else {
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Length : %u", byte1);
|
|
}
|
|
byte2 = tvb_get_guint8(tvb, *offset+2);
|
|
if ((byte2 & 0xC0) == 0xC0)
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : call DTE originated");
|
|
else
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, 1,
|
|
"Reason : unknown");
|
|
byte3 = tvb_get_guint8(tvb, *offset+3);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+3, 1,
|
|
"Number of semi-octets in the alternative DTE address : %u",
|
|
byte3);
|
|
for (i = 0; (i<byte3)&&(i<256) ; i++) {
|
|
if (i % 2 == 0) {
|
|
tmpbuf[i] = ((tvb_get_guint8(tvb, *offset+4+i/2) >> 4)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
} else {
|
|
tmpbuf[i] = (tvb_get_guint8(tvb, *offset+4+i/2)
|
|
& 0x0F) + '0';
|
|
/* if > 9, convert to the right hexadecimal letter */
|
|
if (tmpbuf[i] > '9') tmpbuf[i] += ('A' - '0' - 10);
|
|
}
|
|
}
|
|
tmpbuf[i] = 0;
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+4, byte1 - 2,
|
|
"Alternative DTE address : %s", tmpbuf);
|
|
}
|
|
break;
|
|
case X25_FAC_PRIORITY:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1,
|
|
"Code : %02X (Priority)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_priority);
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Length : %u", byte1);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, byte1, "Value");
|
|
}
|
|
break;
|
|
default:
|
|
if (fac_tree) {
|
|
ti = proto_tree_add_text(fac_tree, tvb, *offset, 1,
|
|
"Code : %02X (Unknown class D)", fac);
|
|
fac_subtree = proto_item_add_subtree(ti, ett_x25_fac_unknown);
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+1, 1,
|
|
"Length : %u", byte1);
|
|
proto_tree_add_text(fac_subtree, tvb, *offset+2, byte1, "Value");
|
|
}
|
|
}
|
|
byte1 = tvb_get_guint8(tvb, *offset+1);
|
|
(*offset) += byte1+2;
|
|
len -= byte1+2;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
x25_ntoa(proto_tree *tree, int *offset, tvbuff_t *tvb,
|
|
packet_info *pinfo, gboolean is_registration)
|
|
{
|
|
int len1, len2;
|
|
int i;
|
|
char *addr1, *addr2;
|
|
char *first, *second;
|
|
guint8 byte;
|
|
int localoffset;
|
|
|
|
addr1=ep_alloc(16);
|
|
addr2=ep_alloc(16);
|
|
|
|
byte = tvb_get_guint8(tvb, *offset);
|
|
len1 = (byte >> 0) & 0x0F;
|
|
len2 = (byte >> 4) & 0x0F;
|
|
|
|
if (tree) {
|
|
proto_tree_add_text(tree, tvb, *offset, 1,
|
|
decode_numeric_bitfield(byte, 0xF0, 1*8,
|
|
is_registration ?
|
|
"DTE address length : %u" :
|
|
"Calling address length : %u"));
|
|
proto_tree_add_text(tree, tvb, *offset, 1,
|
|
decode_numeric_bitfield(byte, 0x0F, 1*8,
|
|
is_registration ?
|
|
"DCE address length : %u" :
|
|
"Called address length : %u"));
|
|
}
|
|
(*offset)++;
|
|
|
|
localoffset = *offset;
|
|
byte = tvb_get_guint8(tvb, localoffset);
|
|
|
|
first=addr1;
|
|
second=addr2;
|
|
for (i = 0; i < (len1 + len2); i++) {
|
|
if (i < len1) {
|
|
if (i % 2 != 0) {
|
|
*first++ = ((byte >> 0) & 0x0F) + '0';
|
|
localoffset++;
|
|
byte = tvb_get_guint8(tvb, localoffset);
|
|
} else {
|
|
*first++ = ((byte >> 4) & 0x0F) + '0';
|
|
}
|
|
} else {
|
|
if (i % 2 != 0) {
|
|
*second++ = ((byte >> 0) & 0x0F) + '0';
|
|
localoffset++;
|
|
byte = tvb_get_guint8(tvb, localoffset);
|
|
} else {
|
|
*second++ = ((byte >> 4) & 0x0F) + '0';
|
|
}
|
|
}
|
|
}
|
|
|
|
*first = '\0';
|
|
*second = '\0';
|
|
|
|
if (len1) {
|
|
if (check_col(pinfo->cinfo, COL_RES_DL_DST))
|
|
col_add_str(pinfo->cinfo, COL_RES_DL_DST, addr1);
|
|
if (tree)
|
|
proto_tree_add_text(tree, tvb, *offset,
|
|
(len1 + 1) / 2,
|
|
is_registration ?
|
|
"DCE address : %s" :
|
|
"Called address : %s",
|
|
addr1);
|
|
}
|
|
if (len2) {
|
|
if (check_col(pinfo->cinfo, COL_RES_DL_SRC))
|
|
col_add_str(pinfo->cinfo, COL_RES_DL_SRC, addr2);
|
|
if (tree)
|
|
proto_tree_add_text(tree, tvb, *offset + len1/2,
|
|
(len2+1)/2+(len1%2+(len2+1)%2)/2,
|
|
is_registration ?
|
|
"DTE address : %s" :
|
|
"Calling address : %s",
|
|
addr2);
|
|
}
|
|
(*offset) += ((len1 + len2 + 1) / 2);
|
|
}
|
|
|
|
static void
|
|
x25_toa(proto_tree *tree, int *offset, tvbuff_t *tvb,
|
|
packet_info *pinfo)
|
|
{
|
|
int len1, len2;
|
|
int i;
|
|
char *addr1, *addr2;
|
|
char *first, *second;
|
|
guint8 byte;
|
|
int localoffset;
|
|
|
|
addr1=ep_alloc(256);
|
|
addr2=ep_alloc(256);
|
|
|
|
len1 = tvb_get_guint8(tvb, *offset);
|
|
if (tree) {
|
|
proto_tree_add_text(tree, tvb, *offset, 1,
|
|
"Called address length : %u",
|
|
len1);
|
|
}
|
|
(*offset)++;
|
|
|
|
len2 = tvb_get_guint8(tvb, *offset);
|
|
if (tree) {
|
|
proto_tree_add_text(tree, tvb, *offset, 1,
|
|
"Calling address length : %u",
|
|
len2);
|
|
}
|
|
(*offset)++;
|
|
|
|
localoffset = *offset;
|
|
byte = tvb_get_guint8(tvb, localoffset);
|
|
|
|
/*
|
|
* XXX - the first two half-octets of the address are the TOA and
|
|
* NPI; process them as such and, if the TOA says an address is
|
|
* an alternative address, process it correctly (i.e., not as a
|
|
* sequence of half-octets containing digit values).
|
|
*/
|
|
first=addr1;
|
|
second=addr2;
|
|
for (i = 0; i < (len1 + len2); i++) {
|
|
if (i < len1) {
|
|
if (i % 2 != 0) {
|
|
*first++ = ((byte >> 0) & 0x0F) + '0';
|
|
localoffset++;
|
|
byte = tvb_get_guint8(tvb, localoffset);
|
|
} else {
|
|
*first++ = ((byte >> 4) & 0x0F) + '0';
|
|
}
|
|
} else {
|
|
if (i % 2 != 0) {
|
|
*second++ = ((byte >> 0) & 0x0F) + '0';
|
|
localoffset++;
|
|
byte = tvb_get_guint8(tvb, localoffset);
|
|
} else {
|
|
*second++ = ((byte >> 4) & 0x0F) + '0';
|
|
}
|
|
}
|
|
}
|
|
|
|
*first = '\0';
|
|
*second = '\0';
|
|
|
|
if (len1) {
|
|
if (check_col(pinfo->cinfo, COL_RES_DL_DST))
|
|
col_add_str(pinfo->cinfo, COL_RES_DL_DST, addr1);
|
|
if (tree)
|
|
proto_tree_add_text(tree, tvb, *offset,
|
|
(len1 + 1) / 2,
|
|
"Called address : %s",
|
|
addr1);
|
|
}
|
|
if (len2) {
|
|
if (check_col(pinfo->cinfo, COL_RES_DL_SRC))
|
|
col_add_str(pinfo->cinfo, COL_RES_DL_SRC, addr2);
|
|
if (tree)
|
|
proto_tree_add_text(tree, tvb, *offset + len1/2,
|
|
(len2+1)/2+(len1%2+(len2+1)%2)/2,
|
|
"Calling address : %s",
|
|
addr2);
|
|
}
|
|
(*offset) += ((len1 + len2 + 1) / 2);
|
|
}
|
|
|
|
static int
|
|
get_x25_pkt_len(tvbuff_t *tvb)
|
|
{
|
|
guint length, called_len, calling_len, dte_len, dce_len;
|
|
guint8 byte2, bytex;
|
|
|
|
byte2 = tvb_get_guint8(tvb, 2);
|
|
switch (byte2)
|
|
{
|
|
case X25_CALL_REQUEST:
|
|
bytex = tvb_get_guint8(tvb, 3);
|
|
called_len = (bytex >> 0) & 0x0F;
|
|
calling_len = (bytex >> 4) & 0x0F;
|
|
length = 4 + (called_len + calling_len + 1) / 2; /* addr */
|
|
if (length < tvb_reported_length(tvb))
|
|
length += (1 + tvb_get_guint8(tvb, length)); /* facilities */
|
|
|
|
return MIN(tvb_reported_length(tvb),length);
|
|
|
|
case X25_CALL_ACCEPTED:
|
|
/* The calling/called address length byte (following the packet type)
|
|
* is not mandatory, so we must check the packet length before trying
|
|
* to read it */
|
|
if (tvb_reported_length(tvb) == 3)
|
|
return(3);
|
|
bytex = tvb_get_guint8(tvb, 3);
|
|
called_len = (bytex >> 0) & 0x0F;
|
|
calling_len = (bytex >> 4) & 0x0F;
|
|
length = 4 + (called_len + calling_len + 1) / 2; /* addr */
|
|
if (length < tvb_reported_length(tvb))
|
|
length += (1 + tvb_get_guint8(tvb, length)); /* facilities */
|
|
|
|
return MIN(tvb_reported_length(tvb),length);
|
|
|
|
case X25_CLEAR_REQUEST:
|
|
case X25_RESET_REQUEST:
|
|
case X25_RESTART_REQUEST:
|
|
return MIN(tvb_reported_length(tvb),5);
|
|
|
|
case X25_DIAGNOSTIC:
|
|
return MIN(tvb_reported_length(tvb),4);
|
|
|
|
case X25_CLEAR_CONFIRMATION:
|
|
case X25_INTERRUPT:
|
|
case X25_INTERRUPT_CONFIRMATION:
|
|
case X25_RESET_CONFIRMATION:
|
|
case X25_RESTART_CONFIRMATION:
|
|
return MIN(tvb_reported_length(tvb),3);
|
|
|
|
case X25_REGISTRATION_REQUEST:
|
|
bytex = tvb_get_guint8(tvb, 3);
|
|
dce_len = (bytex >> 0) & 0x0F;
|
|
dte_len = (bytex >> 4) & 0x0F;
|
|
length = 4 + (dte_len + dce_len + 1) / 2; /* addr */
|
|
if (length < tvb_reported_length(tvb))
|
|
length += (1 + tvb_get_guint8(tvb, length)); /* registration */
|
|
|
|
return MIN(tvb_reported_length(tvb),length);
|
|
|
|
case X25_REGISTRATION_CONFIRMATION:
|
|
bytex = tvb_get_guint8(tvb, 5);
|
|
dce_len = (bytex >> 0) & 0x0F;
|
|
dte_len = (bytex >> 4) & 0x0F;
|
|
length = 6 + (dte_len + dce_len + 1) / 2; /* addr */
|
|
if (length < tvb_reported_length(tvb))
|
|
length += (1 + tvb_get_guint8(tvb, length)); /* registration */
|
|
|
|
return MIN(tvb_reported_length(tvb),length);
|
|
}
|
|
|
|
if (PACKET_IS_DATA(byte2))
|
|
return MIN(tvb_reported_length(tvb),3);
|
|
|
|
switch (PACKET_TYPE_FC(byte2))
|
|
{
|
|
case X25_RR:
|
|
return MIN(tvb_reported_length(tvb),3);
|
|
|
|
case X25_RNR:
|
|
return MIN(tvb_reported_length(tvb),3);
|
|
|
|
case X25_REJ:
|
|
return MIN(tvb_reported_length(tvb),3);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const value_string prt_id_vals[] = {
|
|
{PRT_ID_ISO_8073, "ISO 8073 COTP"},
|
|
{PRT_ID_ISO_8602, "ISO 8602 CLTP"},
|
|
{PRT_ID_ISO_10736_ISO_8073, "ISO 10736 in conjunction with ISO 8073 COTP"},
|
|
{PRT_ID_ISO_10736_ISO_8602, "ISO 10736 in conjunction with ISO 8602 CLTP"},
|
|
{0x00, NULL}
|
|
};
|
|
|
|
static const value_string sharing_strategy_vals[] = {
|
|
{0x00, "No sharing"},
|
|
{0x00, NULL}
|
|
};
|
|
|
|
static void
|
|
dissect_x25_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
x25_dir_t dir, gboolean side)
|
|
{
|
|
proto_tree *x25_tree=0, *gfi_tree=0, *userdata_tree=0;
|
|
proto_item *ti;
|
|
guint localoffset=0;
|
|
guint x25_pkt_len;
|
|
int modulo;
|
|
guint16 vc;
|
|
dissector_handle_t dissect = NULL;
|
|
gboolean toa; /* TOA/NPI address format */
|
|
guint16 bytes0_1;
|
|
guint8 pkt_type;
|
|
const char *short_name = NULL, *long_name = NULL;
|
|
tvbuff_t *next_tvb = NULL;
|
|
gboolean q_bit_set = FALSE;
|
|
gboolean m_bit_set;
|
|
gint payload_len;
|
|
guint32 frag_key;
|
|
void *saved_private_data;
|
|
fragment_data *fd_head;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "X.25");
|
|
|
|
bytes0_1 = tvb_get_ntohs(tvb, 0);
|
|
|
|
modulo = ((bytes0_1 & 0x2000) ? 128 : 8);
|
|
vc = (int)(bytes0_1 & 0x0FFF);
|
|
|
|
pinfo->ctype = CT_X25;
|
|
pinfo->circuit_id = vc;
|
|
|
|
if (bytes0_1 & X25_ABIT) toa = TRUE;
|
|
else toa = FALSE;
|
|
|
|
x25_pkt_len = get_x25_pkt_len(tvb);
|
|
if (x25_pkt_len < 3) /* packet too short */
|
|
{
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Invalid/short X.25 packet");
|
|
if (tree)
|
|
proto_tree_add_protocol_format(tree, proto_x25, tvb, 0, -1,
|
|
"Invalid/short X.25 packet");
|
|
return;
|
|
}
|
|
|
|
pkt_type = tvb_get_guint8(tvb, 2);
|
|
if (PACKET_IS_DATA(pkt_type)) {
|
|
if (bytes0_1 & X25_QBIT)
|
|
q_bit_set = TRUE;
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_x25, tvb, 0, x25_pkt_len, FALSE);
|
|
x25_tree = proto_item_add_subtree(ti, ett_x25);
|
|
ti = proto_tree_add_item(x25_tree, hf_x25_gfi, tvb, 0, 2, FALSE);
|
|
gfi_tree = proto_item_add_subtree(ti, ett_x25_gfi);
|
|
|
|
if (PACKET_IS_DATA(pkt_type)) {
|
|
proto_tree_add_boolean(gfi_tree, hf_x25_qbit, tvb, 0, 2,
|
|
bytes0_1);
|
|
}
|
|
else if (pkt_type == X25_CALL_REQUEST ||
|
|
pkt_type == X25_CALL_ACCEPTED ||
|
|
pkt_type == X25_CLEAR_REQUEST ||
|
|
pkt_type == X25_CLEAR_CONFIRMATION) {
|
|
proto_tree_add_boolean(gfi_tree, hf_x25_abit, tvb, 0, 2,
|
|
bytes0_1);
|
|
}
|
|
|
|
if (pkt_type == X25_CALL_REQUEST || pkt_type == X25_CALL_ACCEPTED ||
|
|
PACKET_IS_DATA(pkt_type)) {
|
|
proto_tree_add_boolean(gfi_tree, hf_x25_dbit, tvb, 0, 2,
|
|
bytes0_1);
|
|
}
|
|
proto_tree_add_uint(gfi_tree, hf_x25_mod, tvb, 0, 2, bytes0_1);
|
|
}
|
|
|
|
switch (pkt_type) {
|
|
case X25_CALL_REQUEST:
|
|
switch (dir) {
|
|
|
|
case X25_FROM_DCE:
|
|
short_name = "Inc. call";
|
|
long_name = "Incoming call";
|
|
break;
|
|
|
|
case X25_FROM_DTE:
|
|
short_name = "Call req.";
|
|
long_name = "Call request";
|
|
break;
|
|
|
|
case X25_UNKNOWN:
|
|
short_name = "Inc. call/Call req.";
|
|
long_name = "Incoming call/Call request";
|
|
break;
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s VC:%d", short_name, vc);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb,
|
|
0, 2, bytes0_1);
|
|
proto_tree_add_uint_format(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_CALL_REQUEST, "Packet Type: %s", long_name);
|
|
}
|
|
localoffset = 3;
|
|
if (localoffset < x25_pkt_len) { /* calling/called addresses */
|
|
if (toa)
|
|
x25_toa(x25_tree, &localoffset, tvb, pinfo);
|
|
else
|
|
x25_ntoa(x25_tree, &localoffset, tvb, pinfo, FALSE);
|
|
}
|
|
|
|
if (localoffset < x25_pkt_len) /* facilities */
|
|
dump_facilities(x25_tree, &localoffset, tvb);
|
|
|
|
if (localoffset < tvb_reported_length(tvb)) /* user data */
|
|
{
|
|
guint8 spi;
|
|
int is_x_264;
|
|
guint8 prt_id;
|
|
|
|
if (x25_tree) {
|
|
ti = proto_tree_add_text(x25_tree, tvb, localoffset, -1,
|
|
"User data");
|
|
userdata_tree = proto_item_add_subtree(ti, ett_x25_user_data);
|
|
}
|
|
|
|
/* X.263/ISO 9577 says that:
|
|
|
|
When CLNP or ESIS are run over X.25, the SPI
|
|
is 0x81 or 0x82, respectively; those are the
|
|
NLPIDs for those protocol.
|
|
|
|
When X.224/ISO 8073 COTP is run over X.25, and
|
|
when ISO 11570 explicit identification is being
|
|
used, the first octet of the user data field is
|
|
a TPDU length field, and the rest is "as defined
|
|
in ITU-T Rec. X.225 | ISO/IEC 8073, Annex B,
|
|
or ITU-T Rec. X.264 and ISO/IEC 11570".
|
|
|
|
When X.264/ISO 11570 default identification is
|
|
being used, there is no user data field in the
|
|
CALL REQUEST packet. This is for X.225/ISO 8073
|
|
COTP.
|
|
|
|
It also says that SPI values from 0x03 through 0x3f are
|
|
reserved and are in use by X.224/ISO 8073 Annex B and
|
|
X.264/ISO 11570. The note says that those values are
|
|
not NLPIDs, they're "used by the respective higher layer
|
|
protocol" and "not used for higher layer protocol
|
|
identification". I infer from this and from what
|
|
X.264/ISO 11570 says that this means that values in those
|
|
range are valid values for the first octet of an
|
|
X.224/ISO 8073 packet or for X.264/ISO 11570.
|
|
|
|
Annex B of X.225/ISO 8073 mentions some additional TPDU
|
|
types that can be put in what I presume is the user
|
|
data of connect requests. It says that:
|
|
|
|
The sending transport entity shall:
|
|
|
|
a) either not transmit any TPDU in the NS-user data
|
|
parameter of the N-CONNECT request primitive; or
|
|
|
|
b) transmit the UN-TPDU (see ITU-T Rec. X.264 and
|
|
ISO/IEC 11570) followed by the NCM-TPDU in the
|
|
NS-user data parameter of the N-CONNECT request
|
|
primitive.
|
|
|
|
I don't know if this means that the user data field
|
|
will contain a UN TPDU followed by an NCM TPDU or not.
|
|
|
|
X.264/ISO 11570 says that:
|
|
|
|
When default identification is being used,
|
|
X.225/ISO 8073 COTP is identified. No user data
|
|
is sent in the network-layer connection request.
|
|
|
|
When explicit identification is being used,
|
|
the user data is a UN TPDU ("Use of network
|
|
connection TPDU"), which specifies the transport
|
|
protocol to use over this network connection.
|
|
It also says that the length of a UN TPDU shall
|
|
not exceed 32 octets, i.e. shall not exceed 0x20;
|
|
it says this is "due to the desire not to conflict
|
|
with the protocol identifier field carried by X.25
|
|
CALL REQUEST/INCOMING CALL packets", and says that
|
|
field has values specified in X.244. X.244 has been
|
|
superseded by X.263/ISO 9577, so that presumably
|
|
means the goal is to allow a UN TPDU's length
|
|
field to be distinguished from an NLPID, allowing
|
|
you to tell whether X.264/ISO 11570 explicit
|
|
identification is being used or an NLPID is
|
|
being used as the SPI.
|
|
|
|
I read this as meaning that, if the ISO mechanisms are
|
|
used to identify the protocol being carried over X.25:
|
|
|
|
if there's no user data in the CALL REQUEST/
|
|
INCOMING CALL packet, it's COTP;
|
|
|
|
if there is user data, then:
|
|
|
|
if the first octet is less than or equal to
|
|
32, it might be a UN TPDU, and that identifies
|
|
the transport protocol being used, and
|
|
it may be followed by more data, such
|
|
as a COTP NCM TPDU if it's COTP;
|
|
|
|
if the first octet is greater than 32, it's
|
|
an NLPID, *not* a TPDU length, and the
|
|
stuff following it is *not* a TPDU.
|
|
|
|
Figure A.2 of X.263/ISO 9577 seems to say that the
|
|
first octet of the user data is a TPDU length field,
|
|
in the range 0x03 through 0x82, and says they are
|
|
for X.225/ISO 8073 Annex B or X.264/ISO 11570.
|
|
|
|
However, X.264/ISO 11570 seems to imply that the length
|
|
field would be that of a UN TPDU, which must be less
|
|
than or equal to 0x20, and X.225/ISO 8073 Annex B seems
|
|
to indicate that the user data must begin with
|
|
an X.264/ISO 11570 UN TPDU, so I'd say that A.2 should
|
|
have said "in the range 0x03 through 0x20", instead
|
|
(the length value doesn't include the length field,
|
|
and the minimum UN TPDU has length, type, PRT-ID,
|
|
and SHARE, so that's 3 bytes without the length). */
|
|
spi = tvb_get_guint8(tvb, localoffset);
|
|
if (spi > 32 || spi < 3) {
|
|
/* First octet is > 32, or < 3, so the user data isn't an
|
|
X.264/ISO 11570 UN TPDU */
|
|
is_x_264 = FALSE;
|
|
} else {
|
|
/* First octet is >= 3 and <= 32, so the user data *might*
|
|
be an X.264/ISO 11570 UN TPDU. Check whether we have
|
|
enough data to see if it is. */
|
|
if (tvb_bytes_exist(tvb, localoffset+1, 1)) {
|
|
/* We do; check whether the second octet is 1. */
|
|
if (tvb_get_guint8(tvb, localoffset+1) == 0x01) {
|
|
/* Yes, the second byte is 1, so it looks like
|
|
a UN TPDU. */
|
|
is_x_264 = TRUE;
|
|
} else {
|
|
/* No, the second byte is not 1, so it's not a
|
|
UN TPDU. */
|
|
is_x_264 = FALSE;
|
|
}
|
|
} else {
|
|
/* We can't see the second byte of the putative UN
|
|
TPDU, so we don't know if that's what it is. */
|
|
is_x_264 = -1;
|
|
}
|
|
}
|
|
if (is_x_264 == -1) {
|
|
/*
|
|
* We don't know what it is; just skip it.
|
|
*/
|
|
localoffset = tvb_length(tvb);
|
|
} else if (is_x_264) {
|
|
/* It looks like an X.264 UN TPDU, so show it as such. */
|
|
if (userdata_tree) {
|
|
proto_tree_add_text(userdata_tree, tvb, localoffset, 1,
|
|
"X.264 length indicator: %u",
|
|
spi);
|
|
proto_tree_add_text(userdata_tree, tvb, localoffset+1, 1,
|
|
"X.264 UN TPDU identifier: 0x%02X",
|
|
tvb_get_guint8(tvb, localoffset+1));
|
|
}
|
|
prt_id = tvb_get_guint8(tvb, localoffset+2);
|
|
if (userdata_tree) {
|
|
proto_tree_add_text(userdata_tree, tvb, localoffset+2, 1,
|
|
"X.264 protocol identifier: %s",
|
|
val_to_str(prt_id, prt_id_vals,
|
|
"Unknown (0x%02X)"));
|
|
proto_tree_add_text(userdata_tree, tvb, localoffset+3, 1,
|
|
"X.264 sharing strategy: %s",
|
|
val_to_str(tvb_get_guint8(tvb, localoffset+3),
|
|
sharing_strategy_vals, "Unknown (0x%02X)"));
|
|
}
|
|
|
|
/* XXX - dissect the variable part? */
|
|
|
|
/* The length doesn't include the length octet itself. */
|
|
localoffset += spi + 1;
|
|
|
|
switch (prt_id) {
|
|
|
|
case PRT_ID_ISO_8073:
|
|
/* ISO 8073 COTP */
|
|
if (!pinfo->fd->flags.visited)
|
|
x25_hash_add_proto_start(vc, pinfo->fd->num, ositp_handle);
|
|
/* XXX - dissect the rest of the user data as COTP?
|
|
That needs support for NCM TPDUs, etc. */
|
|
break;
|
|
|
|
case PRT_ID_ISO_8602:
|
|
/* ISO 8602 CLTP */
|
|
if (!pinfo->fd->flags.visited)
|
|
x25_hash_add_proto_start(vc, pinfo->fd->num, ositp_handle);
|
|
break;
|
|
}
|
|
} else if (is_x_264 == 0) {
|
|
/* It doesn't look like a UN TPDU, so compare the first
|
|
octet of the CALL REQUEST packet with various X.263/
|
|
ISO 9577 NLPIDs, as per Annex A of X.263/ISO 9577. */
|
|
|
|
if (userdata_tree) {
|
|
proto_tree_add_text(userdata_tree, tvb, localoffset, 1,
|
|
"X.263 secondary protocol ID: %s",
|
|
val_to_str(spi, nlpid_vals, "Unknown (0x%02x)"));
|
|
}
|
|
|
|
if (!pinfo->fd->flags.visited) {
|
|
/*
|
|
* Is there a dissector handle for this SPI?
|
|
* If so, assign it to this virtual circuit.
|
|
*/
|
|
dissect = dissector_get_port_handle(x25_subdissector_table, spi);
|
|
if (dissect != NULL)
|
|
x25_hash_add_proto_start(vc, pinfo->fd->num, dissect);
|
|
}
|
|
|
|
/*
|
|
* If there's only one octet of user data, it's just
|
|
* an NLPID; don't try to dissect it.
|
|
*/
|
|
if (localoffset + 1 == tvb_reported_length(tvb))
|
|
return;
|
|
|
|
/*
|
|
* There's more than one octet of user data, so we'll
|
|
* dissect it; for some protocols, the NLPID is considered
|
|
* to be part of the PDU, so, for those cases, we don't
|
|
* skip past it. For other protocols, we skip the NLPID.
|
|
*/
|
|
switch (spi) {
|
|
|
|
case NLPID_ISO8473_CLNP:
|
|
case NLPID_ISO9542_ESIS:
|
|
case NLPID_ISO10589_ISIS:
|
|
case NLPID_ISO10747_IDRP:
|
|
case NLPID_SNDCF:
|
|
/*
|
|
* The NLPID is part of the PDU. Don't skip it.
|
|
* But if it's all there is to the PDU, don't
|
|
* bother dissecting it.
|
|
*/
|
|
break;
|
|
|
|
case NLPID_SPI_X_29:
|
|
/*
|
|
* The first 4 bytes of the call user data are
|
|
* the SPI plus 3 reserved bytes; they are not
|
|
* part of the data to be dissected as X.29 data.
|
|
*/
|
|
localoffset += 4;
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* The NLPID isn't part of the PDU - skip it.
|
|
* If that means there's nothing to dissect
|
|
*/
|
|
localoffset++;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case X25_CALL_ACCEPTED:
|
|
switch (dir) {
|
|
|
|
case X25_FROM_DCE:
|
|
short_name = "Call conn.";
|
|
long_name = "Call connected";
|
|
break;
|
|
|
|
case X25_FROM_DTE:
|
|
short_name = "Call acc.";
|
|
long_name = "Call accepted";
|
|
break;
|
|
|
|
case X25_UNKNOWN:
|
|
short_name = "Call conn./Call acc.";
|
|
long_name = "Call connected/Call accepted";
|
|
break;
|
|
}
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s VC:%d", short_name, vc);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, 0, 2, bytes0_1);
|
|
proto_tree_add_uint_format(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_CALL_ACCEPTED, "Packet Type: %s", long_name);
|
|
}
|
|
localoffset = 3;
|
|
if (localoffset < x25_pkt_len) { /* calling/called addresses */
|
|
if (toa)
|
|
x25_toa(x25_tree, &localoffset, tvb, pinfo);
|
|
else
|
|
x25_ntoa(x25_tree, &localoffset, tvb, pinfo, FALSE);
|
|
}
|
|
|
|
if (localoffset < x25_pkt_len) /* facilities */
|
|
dump_facilities(x25_tree, &localoffset, tvb);
|
|
break;
|
|
case X25_CLEAR_REQUEST:
|
|
switch (dir) {
|
|
|
|
case X25_FROM_DCE:
|
|
short_name = "Clear ind.";
|
|
long_name = "Clear indication";
|
|
break;
|
|
|
|
case X25_FROM_DTE:
|
|
short_name = "Clear req.";
|
|
long_name = "Clear request";
|
|
break;
|
|
|
|
case X25_UNKNOWN:
|
|
short_name = "Clear ind./Clear req.";
|
|
long_name = "Clear indication/Clear request";
|
|
break;
|
|
}
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s VC:%d %s - %s", short_name,
|
|
vc, clear_code(tvb_get_guint8(tvb, 3)),
|
|
clear_diag(tvb_get_guint8(tvb, 4)));
|
|
}
|
|
x25_hash_add_proto_end(vc, pinfo->fd->num);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, 0, 2, bytes0_1);
|
|
proto_tree_add_uint_format(x25_tree, hf_x25_type, tvb,
|
|
localoffset+2, 1, X25_CLEAR_REQUEST, "Packet Type: %s",
|
|
long_name);
|
|
proto_tree_add_text(x25_tree, tvb, 3, 1,
|
|
"Cause : %s", clear_code(tvb_get_guint8(tvb, 3)));
|
|
proto_tree_add_text(x25_tree, tvb, 4, 1,
|
|
"Diagnostic : %s", clear_diag(tvb_get_guint8(tvb, 4)));
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_CLEAR_CONFIRMATION:
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Clear Conf. VC:%d", vc);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, 0, 2, bytes0_1);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_CLEAR_CONFIRMATION);
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
|
|
if (localoffset < tvb_reported_length(tvb)) { /* extended clear conf format */
|
|
if (toa)
|
|
x25_toa(x25_tree, &localoffset, tvb, pinfo);
|
|
else
|
|
x25_ntoa(x25_tree, &localoffset, tvb, pinfo, FALSE);
|
|
}
|
|
|
|
if (localoffset < tvb_reported_length(tvb)) /* facilities */
|
|
dump_facilities(x25_tree, &localoffset, tvb);
|
|
break;
|
|
case X25_DIAGNOSTIC:
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Diag. %d",
|
|
(int)tvb_get_guint8(tvb, 3));
|
|
}
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_DIAGNOSTIC);
|
|
proto_tree_add_text(x25_tree, tvb, 3, 1,
|
|
"Diagnostic : %d", (int)tvb_get_guint8(tvb, 3));
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_INTERRUPT:
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Interrupt VC:%d", vc);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, 0, 2, bytes0_1);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_INTERRUPT);
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_INTERRUPT_CONFIRMATION:
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Interrupt Conf. VC:%d", vc);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, 0, 2, bytes0_1);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_INTERRUPT_CONFIRMATION);
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_RESET_REQUEST:
|
|
switch (dir) {
|
|
|
|
case X25_FROM_DCE:
|
|
short_name = "Reset ind.";
|
|
long_name = "Reset indication";
|
|
break;
|
|
|
|
case X25_FROM_DTE:
|
|
short_name = "Reset req.";
|
|
long_name = "Reset request";
|
|
break;
|
|
|
|
case X25_UNKNOWN:
|
|
short_name = "Reset ind./Reset req.";
|
|
long_name = "Reset indication/Reset request";
|
|
break;
|
|
}
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s VC:%d %s - Diag.:%d",
|
|
short_name, vc, reset_code(tvb_get_guint8(tvb, 3)),
|
|
(int)tvb_get_guint8(tvb, 4));
|
|
}
|
|
x25_hash_add_proto_end(vc, pinfo->fd->num);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, 0, 2, bytes0_1);
|
|
proto_tree_add_uint_format(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_RESET_REQUEST, "Packet Type: %s", long_name);
|
|
proto_tree_add_text(x25_tree, tvb, 3, 1,
|
|
"Cause : %s", reset_code(tvb_get_guint8(tvb, 3)));
|
|
proto_tree_add_text(x25_tree, tvb, 4, 1,
|
|
"Diagnostic : %d", (int)tvb_get_guint8(tvb, 4));
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_RESET_CONFIRMATION:
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Reset conf. VC:%d", vc);
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, 0, 2, bytes0_1);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_RESET_CONFIRMATION);
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_RESTART_REQUEST:
|
|
switch (dir) {
|
|
|
|
case X25_FROM_DCE:
|
|
short_name = "Restart ind.";
|
|
long_name = "Restart indication";
|
|
break;
|
|
|
|
case X25_FROM_DTE:
|
|
short_name = "Restart req.";
|
|
long_name = "Restart request";
|
|
break;
|
|
|
|
case X25_UNKNOWN:
|
|
short_name = "Restart ind./Restart req.";
|
|
long_name = "Restart indication/Restart request";
|
|
break;
|
|
}
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s - Diag.:%d",
|
|
short_name,
|
|
restart_code(tvb_get_guint8(tvb, 3)),
|
|
(int)tvb_get_guint8(tvb, 3));
|
|
}
|
|
if (x25_tree) {
|
|
proto_tree_add_uint_format(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_RESTART_REQUEST, "Packet Type: %s", long_name);
|
|
proto_tree_add_text(x25_tree, tvb, 3, 1,
|
|
"Cause : %s", restart_code(tvb_get_guint8(tvb, 3)));
|
|
proto_tree_add_text(x25_tree, tvb, 4, 1,
|
|
"Diagnostic : %d", (int)tvb_get_guint8(tvb, 4));
|
|
}
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_RESTART_CONFIRMATION:
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Restart conf.");
|
|
if (x25_tree)
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_RESTART_CONFIRMATION);
|
|
localoffset = x25_pkt_len;
|
|
break;
|
|
case X25_REGISTRATION_REQUEST:
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Registration req.");
|
|
if (x25_tree)
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_REGISTRATION_REQUEST);
|
|
localoffset = 3;
|
|
if (localoffset < x25_pkt_len)
|
|
x25_ntoa(x25_tree, &localoffset, tvb, pinfo, TRUE);
|
|
|
|
if (x25_tree) {
|
|
if (localoffset < x25_pkt_len)
|
|
proto_tree_add_text(x25_tree, tvb, localoffset, 1,
|
|
"Registration length: %d",
|
|
tvb_get_guint8(tvb, localoffset) & 0x7F);
|
|
if (localoffset+1 < x25_pkt_len)
|
|
proto_tree_add_text(x25_tree, tvb, localoffset+1,
|
|
tvb_get_guint8(tvb, localoffset) & 0x7F,
|
|
"Registration");
|
|
}
|
|
localoffset = tvb_reported_length(tvb);
|
|
break;
|
|
case X25_REGISTRATION_CONFIRMATION:
|
|
if(check_col(pinfo->cinfo, COL_INFO))
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Registration conf.");
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb, 2, 1,
|
|
X25_REGISTRATION_CONFIRMATION);
|
|
proto_tree_add_text(x25_tree, tvb, 3, 1,
|
|
"Cause: %s", registration_code(tvb_get_guint8(tvb, 3)));
|
|
proto_tree_add_text(x25_tree, tvb, 4, 1,
|
|
"Diagnostic: %s", registration_code(tvb_get_guint8(tvb, 4)));
|
|
}
|
|
localoffset = 5;
|
|
if (localoffset < x25_pkt_len)
|
|
x25_ntoa(x25_tree, &localoffset, tvb, pinfo, TRUE);
|
|
|
|
if (x25_tree) {
|
|
if (localoffset < x25_pkt_len)
|
|
proto_tree_add_text(x25_tree, tvb, localoffset, 1,
|
|
"Registration length: %d",
|
|
tvb_get_guint8(tvb, localoffset) & 0x7F);
|
|
if (localoffset+1 < x25_pkt_len)
|
|
proto_tree_add_text(x25_tree, tvb, localoffset+1,
|
|
tvb_get_guint8(tvb, localoffset) & 0x7F,
|
|
"Registration");
|
|
}
|
|
localoffset = tvb_reported_length(tvb);
|
|
break;
|
|
default :
|
|
localoffset = 2;
|
|
if (PACKET_IS_DATA(pkt_type))
|
|
{
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
if (modulo == 8)
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Data VC:%d P(S):%d P(R):%d %s", vc,
|
|
(pkt_type >> 1) & 0x07,
|
|
(pkt_type >> 5) & 0x07,
|
|
(pkt_type & X25_MBIT_MOD8) ? " M" : "");
|
|
else
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Data VC:%d P(S):%d P(R):%d %s", vc,
|
|
tvb_get_guint8(tvb, localoffset+1) >> 1,
|
|
pkt_type >> 1,
|
|
(tvb_get_guint8(tvb, localoffset+1) & X25_MBIT_MOD128) ? " M" : "");
|
|
}
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, localoffset-2,
|
|
2, bytes0_1);
|
|
if (modulo == 8) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_p_r_mod8, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_boolean(x25_tree, hf_x25_mbit_mod8, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_uint(x25_tree, hf_x25_p_s_mod8, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type_data, tvb,
|
|
localoffset, 1, pkt_type);
|
|
}
|
|
else {
|
|
proto_tree_add_uint(x25_tree, hf_x25_p_r_mod128, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type_data, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_uint(x25_tree, hf_x25_p_s_mod128, tvb,
|
|
localoffset+1, 1,
|
|
tvb_get_guint8(tvb, localoffset+1));
|
|
proto_tree_add_boolean(x25_tree, hf_x25_mbit_mod128, tvb,
|
|
localoffset+1, 1,
|
|
tvb_get_guint8(tvb, localoffset+1));
|
|
}
|
|
}
|
|
if (modulo == 8) {
|
|
m_bit_set = pkt_type & X25_MBIT_MOD8;
|
|
localoffset += 1;
|
|
} else {
|
|
m_bit_set = tvb_get_guint8(tvb, localoffset+1) & X25_MBIT_MOD128;
|
|
localoffset += 2;
|
|
}
|
|
payload_len = tvb_reported_length_remaining(tvb, localoffset);
|
|
if (reassemble_x25) {
|
|
/*
|
|
* Reassemble received and sent traffic separately.
|
|
* We don't reassemble traffic with an unknown direction
|
|
* at all.
|
|
*/
|
|
frag_key = vc;
|
|
if (side) {
|
|
/*
|
|
* OR in an extra bit to distinguish from traffic
|
|
* in the other direction.
|
|
*/
|
|
frag_key |= 0x10000;
|
|
}
|
|
fd_head = fragment_add_seq_next(tvb, localoffset,
|
|
pinfo, frag_key,
|
|
x25_segment_table,
|
|
x25_reassembled_table,
|
|
payload_len, m_bit_set);
|
|
pinfo->fragmented = m_bit_set;
|
|
|
|
if (fd_head) {
|
|
if (fd_head->next) {
|
|
proto_item *frag_tree_item;
|
|
|
|
/* This is the last packet */
|
|
next_tvb = tvb_new_real_data(fd_head->data,
|
|
fd_head->len,
|
|
fd_head->len);
|
|
tvb_set_child_real_data_tvbuff(tvb, next_tvb);
|
|
add_new_data_source(pinfo, next_tvb, "Reassembled X.25");
|
|
show_fragment_seq_tree(fd_head,
|
|
&x25_frag_items,
|
|
x25_tree,
|
|
pinfo, next_tvb, &frag_tree_item);
|
|
}
|
|
}
|
|
|
|
if (m_bit_set && next_tvb == NULL) {
|
|
/*
|
|
* This isn't the last packet, so just
|
|
* show it as X.25 user data.
|
|
*/
|
|
proto_tree_add_text(x25_tree, tvb, localoffset, -1,
|
|
"User data (%u byte%s)", payload_len,
|
|
plurality(payload_len, "", "s"));
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Non-data packets (RR, RNR, REJ).
|
|
*/
|
|
switch (PACKET_TYPE_FC(pkt_type))
|
|
{
|
|
case X25_RR:
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
if (modulo == 8)
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "RR VC:%d P(R):%d",
|
|
vc, (pkt_type >> 5) & 0x07);
|
|
else
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "RR VC:%d P(R):%d",
|
|
vc, tvb_get_guint8(tvb, localoffset+1) >> 1);
|
|
}
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, localoffset-2,
|
|
2, bytes0_1);
|
|
if (modulo == 8) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_p_r_mod8, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type_fc_mod8, tvb,
|
|
localoffset, 1, X25_RR);
|
|
}
|
|
else {
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb,
|
|
localoffset, 1, X25_RR);
|
|
proto_tree_add_item(x25_tree, hf_x25_p_r_mod128, tvb,
|
|
localoffset+1, 1, FALSE);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case X25_RNR:
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
if (modulo == 8)
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "RNR VC:%d P(R):%d",
|
|
vc, (pkt_type >> 5) & 0x07);
|
|
else
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "RNR VC:%d P(R):%d",
|
|
vc, tvb_get_guint8(tvb, localoffset+1) >> 1);
|
|
}
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, localoffset-2,
|
|
2, bytes0_1);
|
|
if (modulo == 8) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_p_r_mod8, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type_fc_mod8, tvb,
|
|
localoffset, 1, X25_RNR);
|
|
}
|
|
else {
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb,
|
|
localoffset, 1, X25_RNR);
|
|
proto_tree_add_item(x25_tree, hf_x25_p_r_mod128, tvb,
|
|
localoffset+1, 1, FALSE);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case X25_REJ:
|
|
if(check_col(pinfo->cinfo, COL_INFO)) {
|
|
if (modulo == 8)
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "REJ VC:%d P(R):%d",
|
|
vc, (pkt_type >> 5) & 0x07);
|
|
else
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "REJ VC:%d P(R):%d",
|
|
vc, tvb_get_guint8(tvb, localoffset+1) >> 1);
|
|
}
|
|
if (x25_tree) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_lcn, tvb, localoffset-2,
|
|
2, bytes0_1);
|
|
if (modulo == 8) {
|
|
proto_tree_add_uint(x25_tree, hf_x25_p_r_mod8, tvb,
|
|
localoffset, 1, pkt_type);
|
|
proto_tree_add_uint(x25_tree, hf_x25_type_fc_mod8, tvb,
|
|
localoffset, 1, X25_REJ);
|
|
}
|
|
else {
|
|
proto_tree_add_uint(x25_tree, hf_x25_type, tvb,
|
|
localoffset, 1, X25_REJ);
|
|
proto_tree_add_item(x25_tree, hf_x25_p_r_mod128, tvb,
|
|
localoffset+1, 1, FALSE);
|
|
}
|
|
}
|
|
}
|
|
localoffset += (modulo == 8) ? 1 : 2;
|
|
}
|
|
|
|
if (localoffset >= tvb_reported_length(tvb))
|
|
return;
|
|
if (pinfo->fragmented)
|
|
return;
|
|
|
|
if (!next_tvb)
|
|
next_tvb = tvb_new_subset(tvb, localoffset, -1, -1);
|
|
|
|
saved_private_data = pinfo->private_data;
|
|
pinfo->private_data = &q_bit_set;
|
|
|
|
/* See if there's already a dissector for this circuit. */
|
|
if (try_circuit_dissector(CT_X25, vc, pinfo->fd->num, next_tvb, pinfo,
|
|
tree)) {
|
|
pinfo->private_data = saved_private_data;
|
|
return; /* found it and dissected it */
|
|
}
|
|
|
|
/* Did the user suggest QLLC/SNA? */
|
|
if (payload_is_qllc_sna) {
|
|
/* Yes - dissect it as QLLC/SNA. */
|
|
if (!pinfo->fd->flags.visited)
|
|
x25_hash_add_proto_start(vc, pinfo->fd->num, qllc_handle);
|
|
call_dissector(qllc_handle, next_tvb, pinfo, tree);
|
|
pinfo->private_data = saved_private_data;
|
|
return;
|
|
}
|
|
|
|
/* If the Call Req. has not been captured, let's look at the first
|
|
byte of the payload to see if this looks like IP or CLNP. */
|
|
switch (tvb_get_guint8(tvb, localoffset)) {
|
|
|
|
case 0x45:
|
|
/* Looks like an IP header */
|
|
if (!pinfo->fd->flags.visited)
|
|
x25_hash_add_proto_start(vc, pinfo->fd->num, ip_handle);
|
|
call_dissector(ip_handle, next_tvb, pinfo, tree);
|
|
pinfo->private_data = saved_private_data;
|
|
return;
|
|
|
|
case NLPID_ISO8473_CLNP:
|
|
if (!pinfo->fd->flags.visited)
|
|
x25_hash_add_proto_start(vc, pinfo->fd->num, clnp_handle);
|
|
call_dissector(clnp_handle, next_tvb, pinfo, tree);
|
|
pinfo->private_data = saved_private_data;
|
|
return;
|
|
}
|
|
|
|
/* Try the heuristic dissectors. */
|
|
if (dissector_try_heuristic(x25_heur_subdissector_list, next_tvb, pinfo,
|
|
tree)) {
|
|
pinfo->private_data = saved_private_data;
|
|
return;
|
|
}
|
|
|
|
/* All else failed; dissect it as raw data */
|
|
call_dissector(data_handle, next_tvb, pinfo, tree);
|
|
pinfo->private_data = saved_private_data;
|
|
}
|
|
|
|
/*
|
|
* X.25 dissector for use when "pinfo->pseudo_header" points to a
|
|
* "struct x25_phdr".
|
|
*/
|
|
static void
|
|
dissect_x25_dir(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_x25_common(tvb, pinfo, tree,
|
|
(pinfo->pseudo_header->x25.flags & FROM_DCE) ? X25_FROM_DCE :
|
|
X25_FROM_DTE,
|
|
pinfo->pseudo_header->x25.flags & FROM_DCE);
|
|
}
|
|
|
|
/*
|
|
* X.25 dissector for use when "pinfo->pseudo_header" doesn't point to a
|
|
* "struct x25_phdr".
|
|
*/
|
|
static void
|
|
dissect_x25(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int direction;
|
|
|
|
/*
|
|
* We don't know if this packet is DTE->DCE or DCE->DCE.
|
|
* However, we can, at least, distinguish between the two
|
|
* sides of the conversation, based on the addresses and
|
|
* ports.
|
|
*/
|
|
direction = CMP_ADDRESS(&pinfo->src, &pinfo->dst);
|
|
if (direction == 0)
|
|
direction = (pinfo->srcport > pinfo->destport)*2 - 1;
|
|
dissect_x25_common(tvb, pinfo, tree, X25_UNKNOWN, direction > 0);
|
|
}
|
|
|
|
static void
|
|
x25_reassemble_init(void)
|
|
{
|
|
fragment_table_init(&x25_segment_table);
|
|
reassembled_table_init(&x25_reassembled_table);
|
|
}
|
|
|
|
void
|
|
proto_register_x25(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_x25_gfi,
|
|
{ "GFI", "x.25.gfi", FT_UINT16, BASE_DEC, NULL, 0xF000,
|
|
"General format identifier", HFILL }},
|
|
{ &hf_x25_abit,
|
|
{ "A Bit", "x.25.a", FT_BOOLEAN, 16, NULL, X25_ABIT,
|
|
"Address Bit", HFILL }},
|
|
{ &hf_x25_qbit,
|
|
{ "Q Bit", "x.25.q", FT_BOOLEAN, 16, NULL, X25_QBIT,
|
|
"Qualifier Bit", HFILL }},
|
|
{ &hf_x25_dbit,
|
|
{ "D Bit", "x.25.d", FT_BOOLEAN, 16, NULL, X25_DBIT,
|
|
"Delivery Confirmation Bit", HFILL }},
|
|
{ &hf_x25_mod,
|
|
{ "Modulo", "x.25.mod", FT_UINT16, BASE_DEC, VALS(vals_modulo), 0x3000,
|
|
"Specifies whether the frame is modulo 8 or 128", HFILL }},
|
|
{ &hf_x25_lcn,
|
|
{ "Logical Channel", "x.25.lcn", FT_UINT16, BASE_DEC, NULL, 0x0FFF,
|
|
"Logical Channel Number", HFILL }},
|
|
{ &hf_x25_type,
|
|
{ "Packet Type", "x.25.type", FT_UINT8, BASE_HEX, VALS(vals_x25_type), 0x0,
|
|
"Packet Type", HFILL }},
|
|
{ &hf_x25_type_fc_mod8,
|
|
{ "Packet Type", "x.25.type", FT_UINT8, BASE_HEX, VALS(vals_x25_type), 0x1F,
|
|
"Packet Type", HFILL }},
|
|
{ &hf_x25_type_data,
|
|
{ "Packet Type", "x.25.type", FT_UINT8, BASE_HEX, VALS(vals_x25_type), 0x01,
|
|
"Packet Type", HFILL }},
|
|
{ &hf_x25_p_r_mod8,
|
|
{ "P(R)", "x.25.p_r", FT_UINT8, BASE_DEC, NULL, 0xE0,
|
|
"Packet Receive Sequence Number", HFILL }},
|
|
{ &hf_x25_p_r_mod128,
|
|
{ "P(R)", "x.25.p_r", FT_UINT8, BASE_DEC, NULL, 0xFE,
|
|
"Packet Receive Sequence Number", HFILL }},
|
|
{ &hf_x25_mbit_mod8,
|
|
{ "M Bit", "x.25.m", FT_BOOLEAN, 8, TFS(&m_bit_tfs), X25_MBIT_MOD8,
|
|
"More Bit", HFILL }},
|
|
{ &hf_x25_mbit_mod128,
|
|
{ "M Bit", "x.25.m", FT_BOOLEAN, 8, TFS(&m_bit_tfs), X25_MBIT_MOD128,
|
|
"More Bit", HFILL }},
|
|
{ &hf_x25_p_s_mod8,
|
|
{ "P(S)", "x.25.p_s", FT_UINT8, BASE_DEC, NULL, 0x0E,
|
|
"Packet Send Sequence Number", HFILL }},
|
|
{ &hf_x25_p_s_mod128,
|
|
{ "P(S)", "x.25.p_s", FT_UINT8, BASE_DEC, NULL, 0xFE,
|
|
"Packet Send Sequence Number", HFILL }},
|
|
{ &hf_x25_segment_overlap,
|
|
{ "Fragment overlap", "x25.fragment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment overlaps with other fragments", HFILL }},
|
|
|
|
{ &hf_x25_segment_overlap_conflict,
|
|
{ "Conflicting data in fragment overlap", "x25.fragment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Overlapping fragments contained conflicting data", HFILL }},
|
|
|
|
{ &hf_x25_segment_multiple_tails,
|
|
{ "Multiple tail fragments found", "x25.fragment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Several tails were found when defragmenting the packet", HFILL }},
|
|
|
|
{ &hf_x25_segment_too_long_segment,
|
|
{ "Fragment too long", "x25.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"Fragment contained data past end of packet", HFILL }},
|
|
|
|
{ &hf_x25_segment_error,
|
|
{ "Defragmentation error", "x25.fragment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"Defragmentation error due to illegal fragments", HFILL }},
|
|
|
|
{ &hf_x25_segment,
|
|
{ "X.25 Fragment", "x25.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
"X25 Fragment", HFILL }},
|
|
|
|
{ &hf_x25_segments,
|
|
{ "X.25 Fragments", "x25.fragments", FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"X.25 Fragments", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_x25,
|
|
&ett_x25_gfi,
|
|
&ett_x25_fac,
|
|
&ett_x25_fac_unknown,
|
|
&ett_x25_fac_mark,
|
|
&ett_x25_fac_reverse,
|
|
&ett_x25_fac_throughput,
|
|
&ett_x25_fac_cug,
|
|
&ett_x25_fac_called_modif,
|
|
&ett_x25_fac_cug_outgoing_acc,
|
|
&ett_x25_fac_throughput_min,
|
|
&ett_x25_fac_express_data,
|
|
&ett_x25_fac_bilateral_cug,
|
|
&ett_x25_fac_packet_size,
|
|
&ett_x25_fac_window_size,
|
|
&ett_x25_fac_rpoa_selection,
|
|
&ett_x25_fac_transit_delay,
|
|
&ett_x25_fac_call_transfer,
|
|
&ett_x25_fac_called_addr_ext,
|
|
&ett_x25_fac_ete_transit_delay,
|
|
&ett_x25_fac_calling_addr_ext,
|
|
&ett_x25_fac_call_deflect,
|
|
&ett_x25_fac_priority,
|
|
&ett_x25_user_data,
|
|
&ett_x25_segment,
|
|
&ett_x25_segments
|
|
};
|
|
module_t *x25_module;
|
|
|
|
proto_x25 = proto_register_protocol ("X.25", "X.25", "x.25");
|
|
proto_register_field_array (proto_x25, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
x25_subdissector_table = register_dissector_table("x.25.spi",
|
|
"X.25 secondary protocol identifier", FT_UINT8, BASE_HEX);
|
|
register_heur_dissector_list("x.25", &x25_heur_subdissector_list);
|
|
|
|
register_dissector("x.25_dir", dissect_x25_dir, proto_x25);
|
|
register_dissector("x.25", dissect_x25, proto_x25);
|
|
|
|
/* Preferences */
|
|
x25_module = prefs_register_protocol(proto_x25, NULL);
|
|
prefs_register_obsolete_preference(x25_module, "non_q_bit_is_sna");
|
|
prefs_register_bool_preference(x25_module, "payload_is_qllc_sna",
|
|
"Default to QLLC/SNA",
|
|
"If CALL REQUEST not seen or didn't specify protocol, dissect as QLLC/SNA",
|
|
&payload_is_qllc_sna);
|
|
prefs_register_bool_preference(x25_module, "reassemble",
|
|
"Reassemble fragmented X.25 packets",
|
|
"Reassemble fragmented X.25 packets",
|
|
&reassemble_x25);
|
|
register_init_routine(&x25_reassemble_init);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_x25(void)
|
|
{
|
|
dissector_handle_t x25_handle;
|
|
|
|
/*
|
|
* Get handles for various dissectors.
|
|
*/
|
|
ip_handle = find_dissector("ip");
|
|
clnp_handle = find_dissector("clnp");
|
|
ositp_handle = find_dissector("ositp");
|
|
qllc_handle = find_dissector("qllc");
|
|
data_handle = find_dissector("data");
|
|
|
|
x25_handle = find_dissector("x.25");
|
|
dissector_add("llc.dsap", SAP_X25, x25_handle);
|
|
}
|