703 lines
22 KiB
C
703 lines
22 KiB
C
/* packet-tpkt.c
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*
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* Routine to check for RFC 1006 TPKT header and to dissect TPKT header
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* Copyright 2000, Philips Electronics N.V.
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* Andreas Sikkema <h323@ramdyne.nl>
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*
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* Routine to dissect RFC 1006 TPKT packet containing OSI TP PDU
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* Copyright 2001, Martin Thomas <Martin_A_Thomas@yahoo.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/exceptions.h>
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#include <epan/prefs.h>
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#include <epan/show_exception.h>
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#include "packet-tpkt.h"
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void proto_register_tpkt(void);
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void proto_reg_handoff_tpkt(void);
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/* TPKT header fields */
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static int proto_tpkt = -1;
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static protocol_t *proto_tpkt_ptr;
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static int hf_tpkt_version = -1;
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static int hf_tpkt_reserved = -1;
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static int hf_tpkt_length = -1;
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static int hf_tpkt_continuation_data = -1;
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/* TPKT fields defining a sub tree */
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static gint ett_tpkt = -1;
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/* desegmentation of OSI over TPKT over TCP */
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static gboolean tpkt_desegment = TRUE;
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#define TCP_PORT_TPKT_RANGE "102"
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/* find the dissector for OSI TP (aka COTP) */
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static dissector_handle_t osi_tp_handle;
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static dissector_handle_t tpkt_handle;
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#define DEFAULT_TPKT_PORT_RANGE "102"
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static range_t *tpkt_tcp_port_range;
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/*
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* Check whether this could be a TPKT-encapsulated PDU.
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* Returns -1 if it's not, and the PDU length from the TPKT header
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* if it is.
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*
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* "min_len" is the minimum length of the PDU; the length field in the
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* TPKT header must be at least "4+min_len" in order for this to be a
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* valid TPKT PDU for the protocol in question.
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*/
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int
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is_tpkt(tvbuff_t *tvb, int min_len)
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{
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guint16 pkt_len;
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/*
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* If TPKT is disabled, don't dissect it, just return -1, meaning
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* "this isn't TPKT".
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*/
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if (!proto_is_protocol_enabled(proto_tpkt_ptr))
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return -1;
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/* There should at least be 4 bytes left in the frame */
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if (tvb_captured_length(tvb) < 4)
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return -1; /* there aren't */
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/*
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* The first octet should be 3 and the second one should be 0
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* The H.323 implementers guide suggests that this might not
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* always be the case....
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*/
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if (!(tvb_get_guint8(tvb, 0) == 3 && tvb_get_guint8(tvb, 1) == 0))
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return -1; /* they're not */
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/*
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* Get the length from the TPKT header. Make sure it's large
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* enough.
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*/
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pkt_len = tvb_get_ntohs(tvb, 2);
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if (pkt_len < 4 + min_len)
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return -1; /* it's not */
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/*
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* Return the length from the header.
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*/
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return pkt_len;
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}
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guint16
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is_asciitpkt(tvbuff_t *tvb)
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{
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guint16 count;
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/*
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* If TPKT is disabled, don't dissect it, just return -1, meaning
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* "this isn't TPKT".
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*/
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if (!proto_is_protocol_enabled(proto_tpkt_ptr))
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return -1;
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/* There should at least be 8 bytes left in the frame */
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if (!tvb_bytes_exist(tvb, 0, 8))
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return -1; /* there aren't */
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/*
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* The first four octets should be alphanumeric ASCII
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*/
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for (count = 0; count <=7 ; count ++)
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{
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if(!g_ascii_isalnum(tvb_get_guint8(tvb,count)))
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{
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return 0;
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}
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}
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return 1;
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}
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static int
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parseLengthText ( guint8* pTpktData )
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{
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int value = 0;
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const guint8 * pData = pTpktData;
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int bitvalue = 0, count1 = 3;
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int count;
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for (count = 0; count <= 3; count++)
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{
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if (('0' <= *(pData + count)) && (*(pData + count) <= '9'))
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bitvalue = *(pData + count) - 48;
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else if (('a' <= *(pData + count)) && (*(pData + count) <= 'f' ))
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bitvalue = *(pData + count) - 87;
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else if (('A' <= *(pData + count)) && (*(pData + count) <= 'F' ))
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bitvalue = *(pData + count) - 55;
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value += bitvalue << (4*count1);
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count1--;
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}
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return value;
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}
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static int
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parseVersionText ( guint8* pTpktData )
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{
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int value = 0;
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guint8 * pData = pTpktData;
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int bitvalue = 0, count1 = 1;
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int count;
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for (count = 0; count <= 1; count++)
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{
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if (('0' <= *(pData + count)) && (*(pData + count) <= '9'))
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bitvalue = *(pData + count) - 48;
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else if (('a' <= *(pData + count)) && (*(pData + count) <= 'f' ))
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bitvalue = *(pData + count) - 87;
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else if (('A' <= *(pData + count)) && (*(pData + count) <= 'F' ))
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bitvalue = *(pData + count) - 55;
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value += bitvalue << (4*count1);
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count1--;
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}
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return value;
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}
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static int
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parseReservedText ( guint8* pTpktData )
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{
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int value = 0;
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guint8 * pData = pTpktData;
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int bitvalue = 0, count1 = 1;
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int count;
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for (count = 0; count <= 1; count++)
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{
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if (('0' <= *(pData + count)) && (*(pData + count) <= '9'))
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bitvalue = *(pData + count) - 48;
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else if (('a' <= *(pData + count)) && (*(pData + count) <= 'f' ))
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bitvalue = *(pData + count) - 87;
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else if (('A' <= *(pData + count)) && (*(pData + count) <= 'F' ))
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bitvalue = *(pData + count) - 55;
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value += bitvalue << (4*count1);
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count1--;
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}
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return value;
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}
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/*
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* Length of the TPKT text-layer header.
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*/
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static const int TEXT_LAYER_LENGTH = 9;
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/*
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* Dissect ASCII TPKT-encapsulated data in a TCP stream.
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*/
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void
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dissect_asciitpkt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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dissector_handle_t subdissector_handle)
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{
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proto_item *ti = NULL;
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proto_tree *tpkt_tree = NULL;
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volatile int offset = 0;
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int length_remaining;
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int data_len;
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volatile int mgcp_packet_len = 0;
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int mgcp_version = 0;
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int mgcp_reserved = 0;
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volatile int length;
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tvbuff_t *volatile next_tvb;
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const char *saved_proto;
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guint8 string[4];
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/*
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* If we're reassembling segmented TPKT PDUs, empty the COL_INFO
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* column, so subdissectors can append information
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* without having to worry about emptying the column.
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*
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* We use "col_add_str()" because the subdissector
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* might be appending information to the column, in
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* which case we'd have to zero the buffer out explicitly
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* anyway.
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*/
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if (tpkt_desegment)
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col_set_str(pinfo->cinfo, COL_INFO, "");
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while (tvb_reported_length_remaining(tvb, offset) != 0) {
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/*
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* Is the first byte of this putative TPKT header
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* a valid TPKT version number, i.e. 3?
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*/
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if (tvb_get_guint8(tvb, offset) != 48) {
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/*
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* No, so don't assume this is a TPKT header;
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* we might be in the middle of TPKT data,
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* so don't get the length and don't try to
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* do reassembly.
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*/
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPKT");
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col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_tpkt, tvb,
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offset, -1, ENC_NA);
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tpkt_tree = proto_item_add_subtree(ti, ett_tpkt);
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proto_tree_add_item(tpkt_tree, hf_tpkt_continuation_data, tvb, offset, -1, ENC_NA);
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}
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return;
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}
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length_remaining = tvb_captured_length_remaining(tvb, offset);
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/*
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* Get the length from the TPKT header.
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*/
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tvb_memcpy(tvb, (guint8 *)string, offset, 2);
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mgcp_version = parseVersionText(string);
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tvb_memcpy(tvb, (guint8 *)string, offset +2, 2);
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mgcp_reserved = parseReservedText(string);
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tvb_memcpy(tvb, (guint8 *)string, offset + 4, 4);
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mgcp_packet_len = parseLengthText(string);
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data_len = mgcp_packet_len;
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/*
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* Dissect the TPKT header.
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* Save and restore "pinfo->current_proto".
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*/
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saved_proto = pinfo->current_proto;
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pinfo->current_proto = "TPKT";
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPKT");
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/*
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* Don't add the TPKT header information if we're
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* reassembling segmented TPKT PDUs or if this
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* PDU isn't reassembled.
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*
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* XXX - the first is so that subdissectors can append
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* information without getting TPKT stuff in the middle;
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* why the second?
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*/
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if (!tpkt_desegment && !pinfo->fragmented) {
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"TPKT Data length = %u", data_len);
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_tpkt, tvb,
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offset, 8, ENC_NA);
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tpkt_tree = proto_item_add_subtree(ti, ett_tpkt);
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proto_item_set_text(ti, "TPKT");
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/* Version */
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proto_tree_add_uint(tpkt_tree, hf_tpkt_version, tvb,
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offset, 2, mgcp_version);
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/* Reserved octet*/
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proto_tree_add_uint(tpkt_tree, hf_tpkt_reserved, tvb,
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offset + 2, 2, mgcp_reserved);
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/* Length */
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proto_tree_add_uint(tpkt_tree, hf_tpkt_length, tvb,
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offset + 4, 4, mgcp_packet_len);
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}
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pinfo->current_proto = saved_proto;
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/* Skip the TPKT header. */
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offset += TEXT_LAYER_LENGTH;
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length = length_remaining - TEXT_LAYER_LENGTH;
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if (length > data_len)
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length = data_len;
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next_tvb = tvb_new_subset_length_caplen(tvb, offset,length, data_len);
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/*
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* Call the subdissector.
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*
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* If it gets an error that means there's no point in
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* dissecting any more TPKT messages, rethrow the
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* exception in question.
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*
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* If it gets any other error, report it and continue, as that
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* means that TPKT message got an error, but that doesn't mean
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* we should stop dissecting TPKT messages within this frame
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* or chunk of reassembled data.
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*/
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TRY {
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call_dissector(subdissector_handle, next_tvb, pinfo,
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tree);
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}
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CATCH_NONFATAL_ERRORS {
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show_exception(tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);
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}
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ENDTRY;
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/*
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* Skip the payload.
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*/
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offset += data_len;
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}
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}
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/*
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* Dissect TPKT-encapsulated data in a TCP stream.
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*/
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void
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dissect_tpkt_encap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean desegment, dissector_handle_t subdissector_handle)
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{
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proto_item *ti = NULL;
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proto_tree *tpkt_tree = NULL;
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volatile int offset = 0;
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int length_remaining;
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int data_len;
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volatile int length;
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tvbuff_t *volatile next_tvb;
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const char *saved_proto;
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/*
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* If we're reassembling segmented TPKT PDUs, empty the COL_INFO
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* column, so subdissectors can append information
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* without having to worry about emptying the column.
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*
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* We use "col_add_str()" because the subdissector
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* might be appending information to the column, in
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* which case we'd have to zero the buffer out explicitly
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* anyway.
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*/
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if (desegment)
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col_set_str(pinfo->cinfo, COL_INFO, "");
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while (tvb_reported_length_remaining(tvb, offset) != 0) {
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/*
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* Is the first byte of this putative TPKT header
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* a valid TPKT version number, i.e. 3?
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*/
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if (tvb_get_guint8(tvb, offset) != 3) {
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/*
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* No, so don't assume this is a TPKT header;
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* we might be in the middle of TPKT data,
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* so don't get the length and don't try to
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* do reassembly.
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*/
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPKT");
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col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_tpkt, tvb,
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offset, -1, ENC_NA);
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tpkt_tree = proto_item_add_subtree(ti, ett_tpkt);
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proto_tree_add_item(tpkt_tree, hf_tpkt_continuation_data, tvb, offset, -1, ENC_NA);
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}
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return;
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}
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length_remaining = tvb_captured_length_remaining(tvb, offset);
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/*
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* Can we do reassembly?
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*/
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if (desegment && pinfo->can_desegment) {
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/*
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* Yes - is the TPKT header split across segment
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* boundaries?
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*/
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if (length_remaining < 4) {
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/*
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* Yes. Tell the TCP dissector where the data
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* for this message starts in the data it
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* handed us and that we need "some more data."
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* Don't tell it exactly how many bytes we need
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* because if/when we ask for even more (after
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* the header) that will break reassembly.
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*/
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pinfo->desegment_offset = offset;
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pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
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return;
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}
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}
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/*
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* Get the length from the TPKT header.
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*/
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data_len = tvb_get_ntohs(tvb, offset + 2);
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/*
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* Can we do reassembly?
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*/
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if (desegment && pinfo->can_desegment) {
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/*
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* Yes - is the payload split across segment
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* boundaries?
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*/
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if (length_remaining < data_len) {
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/*
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* Yes. Tell the TCP dissector where
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* the data for this message starts in
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* the data it handed us, and how many
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* more bytes we need, and return.
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*/
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pinfo->desegment_offset = offset;
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pinfo->desegment_len =
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data_len - length_remaining;
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return;
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}
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}
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/*
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* Dissect the TPKT header.
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* Save and restore "pinfo->current_proto".
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*/
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saved_proto = pinfo->current_proto;
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pinfo->current_proto = "TPKT";
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPKT");
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/*
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* Don't add the TPKT header information if we're
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* reassembling segmented TPKT PDUs or if this
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* PDU isn't reassembled.
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*
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* XXX - the first is so that subdissectors can append
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* information without getting TPKT stuff in the middle;
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* why the second?
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*/
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if (!desegment && !pinfo->fragmented) {
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"TPKT Data length = %u", data_len);
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_tpkt, tvb,
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offset, 4, ENC_NA);
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tpkt_tree = proto_item_add_subtree(ti, ett_tpkt);
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proto_item_set_text(ti, "TPKT");
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/* Version */
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proto_tree_add_item(tpkt_tree, hf_tpkt_version, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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proto_item_append_text(ti, ", Version: 3");
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/* Reserved octet*/
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proto_tree_add_item(tpkt_tree, hf_tpkt_reserved, tvb,
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offset + 1, 1, ENC_BIG_ENDIAN);
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/* Length */
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proto_tree_add_uint(tpkt_tree, hf_tpkt_length, tvb,
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offset + 2, 2, data_len);
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proto_item_append_text(ti, ", Length: %u", data_len);
|
|
}
|
|
pinfo->current_proto = saved_proto;
|
|
|
|
/* Skip the TPKT header. */
|
|
offset += 4;
|
|
data_len -= 4;
|
|
|
|
/*
|
|
* Construct a tvbuff containing the amount of the payload
|
|
* we have available. Make its reported length the
|
|
* amount of data in this TPKT packet.
|
|
*
|
|
* XXX - if reassembly isn't enabled. the subdissector
|
|
* will throw a BoundsError exception, rather than a
|
|
* ReportedBoundsError exception. We really want
|
|
* a tvbuff where the length is "length", the reported
|
|
* length is "plen + 2", and the "if the snapshot length
|
|
* were infinite" length were the minimum of the
|
|
* reported length of the tvbuff handed to us and "plen+2",
|
|
* with a new type of exception thrown if the offset is
|
|
* within the reported length but beyond that third length,
|
|
* with that exception getting the "Unreassembled Packet"
|
|
* error.
|
|
*/
|
|
length = length_remaining - 4;
|
|
if (length > data_len)
|
|
length = data_len;
|
|
next_tvb = tvb_new_subset_length_caplen(tvb, offset, length, data_len);
|
|
|
|
/*
|
|
* Call the subdissector.
|
|
*
|
|
* If it gets an error that means there's no point in
|
|
* dissecting any more TPKT messages, rethrow the
|
|
* exception in question.
|
|
*
|
|
* If it gets any other error, report it and continue,
|
|
* as that means that TPKT message got an error, but
|
|
* that doesn't mean we should stop dissecting TPKT
|
|
* messages within this frame or chunk of reassembled
|
|
* data.
|
|
*/
|
|
TRY {
|
|
call_dissector(subdissector_handle, next_tvb, pinfo,
|
|
tree);
|
|
}
|
|
CATCH_NONFATAL_ERRORS {
|
|
show_exception(tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);
|
|
}
|
|
ENDTRY;
|
|
|
|
/*
|
|
* Skip the payload.
|
|
*/
|
|
offset += length;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dissect RFC 1006 TPKT, which wraps a TPKT header around an OSI TP
|
|
* PDU.
|
|
*/
|
|
static int
|
|
dissect_tpkt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
dissect_tpkt_encap(tvb, pinfo, tree, tpkt_desegment, osi_tp_handle);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
/*
|
|
* Dissect ASCII TPKT, which wraps a ASCII TPKT header around an OSI TP
|
|
* PDU.
|
|
*/
|
|
#if 0
|
|
static int
|
|
dissect_ascii_tpkt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
dissect_asciitpkt(tvb, pinfo, tree, osi_tp_handle);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
proto_register_tpkt(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{
|
|
&hf_tpkt_version,
|
|
{
|
|
"Version",
|
|
"tpkt.version",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"Version, only version 3 is defined", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_tpkt_reserved,
|
|
{
|
|
"Reserved",
|
|
"tpkt.reserved",
|
|
FT_UINT8,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"Reserved, should be 0", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_tpkt_length,
|
|
{
|
|
"Length",
|
|
"tpkt.length",
|
|
FT_UINT16,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
"Length of data unit, including this header", HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_tpkt_continuation_data,
|
|
{
|
|
"Continuation data",
|
|
"tpkt.continuation_data",
|
|
FT_BYTES,
|
|
BASE_NONE,
|
|
NULL,
|
|
0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
};
|
|
|
|
static gint *ett[] =
|
|
{
|
|
&ett_tpkt,
|
|
};
|
|
module_t *tpkt_module;
|
|
|
|
proto_tpkt = proto_register_protocol("TPKT - ISO on TCP - RFC1006", "TPKT", "tpkt");
|
|
proto_tpkt_ptr = find_protocol_by_id(proto_tpkt);
|
|
proto_register_field_array(proto_tpkt, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
tpkt_handle = register_dissector("tpkt", dissect_tpkt, proto_tpkt);
|
|
|
|
tpkt_module = prefs_register_protocol(proto_tpkt, proto_reg_handoff_tpkt);
|
|
prefs_register_bool_preference(tpkt_module, "desegment",
|
|
"Reassemble TPKT messages spanning multiple TCP segments",
|
|
"Whether the TPKT dissector should reassemble messages spanning multiple TCP segments. "
|
|
"To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&tpkt_desegment);
|
|
|
|
range_convert_str(wmem_epan_scope(), &tpkt_tcp_port_range, DEFAULT_TPKT_PORT_RANGE, MAX_TCP_PORT);
|
|
|
|
prefs_register_range_preference(tpkt_module, "tcp.ports", "TPKT TCP ports",
|
|
"TCP ports to be decoded as TPKT (default: "
|
|
DEFAULT_TPKT_PORT_RANGE ")",
|
|
&tpkt_tcp_port_range, MAX_TCP_PORT);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_tpkt(void)
|
|
{
|
|
static range_t *port_range = NULL;
|
|
|
|
osi_tp_handle = find_dissector("ositp");
|
|
dissector_add_uint_range_with_preference("tcp.port", TCP_PORT_TPKT_RANGE, tpkt_handle);
|
|
|
|
dissector_delete_uint_range("tcp.port", port_range, tpkt_handle);
|
|
wmem_free(wmem_epan_scope(), port_range);
|
|
|
|
port_range = range_copy(wmem_epan_scope(), tpkt_tcp_port_range);
|
|
dissector_add_uint_range("tcp.port", port_range, tpkt_handle);
|
|
|
|
/*
|
|
tpkt_ascii_handle = create_dissector_handle(dissect_ascii_tpkt, proto_tpkt);
|
|
dissector_add_uint("tcp.port", TCP_PORT_TPKT, tpkt_ascii_handle);
|
|
*/
|
|
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|