From Mithun Roy:
This is a patch for a new dissector that decodes LTP (Licklider Transmission Protocol) data according to RFC 5326. svn path=/trunk/; revision=31120
This commit is contained in:
Jaap Keuter
parent
e9fd4a430e
commit
c795dd1af5
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@ -701,6 +701,7 @@ set(DISSECTOR_SRC
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dissectors/packet-loop.c
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dissectors/packet-lpd.c
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dissectors/packet-lsc.c
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dissectors/packet-ltp.c
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dissectors/packet-lwapp.c
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dissectors/packet-lwres.c
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dissectors/packet-m2pa.c
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@ -606,6 +606,7 @@ DISSECTOR_SRC = \
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packet-loop.c \
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packet-lpd.c \
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packet-lsc.c \
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packet-ltp.c \
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packet-lwapp.c \
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packet-lwres.c \
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packet-m2pa.c \
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@ -46,11 +46,8 @@
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void proto_reg_handoff_bundle(void);
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static void dissect_tcp_bundle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static void dissect_udp_bundle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_complete_bundle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static int dissect_primary_header(packet_info *pinfo, proto_tree *primary_tree, tvbuff_t *tvb);
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static int dissect_admin_record(proto_tree *primary_tree, tvbuff_t *tvb, int offset);
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static int evaluate_sdnv(tvbuff_t *tvb, int offset, int *bytecount);
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static gint64 evaluate_sdnv_64(tvbuff_t *tvb, int offset, int *bytecount);
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static int dissect_payload_header(proto_tree *tree, tvbuff_t *tvb, int bundle_offset, int *lastheader);
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static int display_metadata_block(proto_tree *tree, tvbuff_t *tvb, int bundle_offset, int *lastheader);
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static int dissect_contact_header(tvbuff_t *tvb, packet_info *pinfo,
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@ -600,7 +597,7 @@ dissect_tcp_convergence_data_header(tvbuff_t *tvb, proto_tree *tree)
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* otherwise the length of the bundle.
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*/
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static int
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int
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dissect_complete_bundle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *primary_item = NULL;
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@ -1994,7 +1991,7 @@ display_metadata_block(proto_tree *tree, tvbuff_t *tvb, int offset, int *lasthea
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#define SDNV_MASK 0x7f
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/*3rd arg is number of bytes in field (returned)*/
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static int
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int
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evaluate_sdnv(tvbuff_t *tvb, int offset, int *bytecount)
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{
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int value = 0;
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@ -2028,7 +2025,7 @@ evaluate_sdnv(tvbuff_t *tvb, int offset, int *bytecount)
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}
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/* Special Function to evaluate 64 bit SDNVs */
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static gint64
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gint64
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evaluate_sdnv_64(tvbuff_t *tvb, int offset, int *bytecount)
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{
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gint64 value = 0;
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@ -133,3 +133,9 @@
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#define BLOCK_CONTROL_EID_REFERENCE 0x40
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#define IPN_SCHEME_STR "ipn"
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int evaluate_sdnv(tvbuff_t *tvb, int offset, int *bytecount);
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gint64 evaluate_sdnv_64(tvbuff_t *tvb, int offset, int *bytecount);
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int dissect_complete_bundle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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@ -0,0 +1,853 @@
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/* packet-ltp.c
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* Routines for LTP dissection
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* Copyright 2009, Mithun Roy <mithunroy13@gmail.com>
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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 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include "packet-dtn.h"
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#define LTP_MIN_DATA_BUFFER 5
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#define LTP_MAX_HDR_EXTN 16
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#define LTP_MAX_TRL_EXTN 16
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void proto_reg_handoff_ltp(void);
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/* Initialize the protocol and registered fields */
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static int proto_ltp = -1;
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/* LTP Header variables */
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static int hf_ltp_version = -1;
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static int hf_ltp_type = -1;
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static int hf_ltp_session_id = -1;
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static int hf_ltp_session_orig = -1;
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static int hf_ltp_session_no = -1;
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static int hf_ltp_hdr_extn_cnt = -1;
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static int hf_ltp_trl_extn_cnt = -1;
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/* LTP Data Segment variable */
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static int hf_ltp_data_clid = -1;
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static int hf_ltp_data_offset = -1;
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static int hf_ltp_data_length = -1;
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static int hf_ltp_data_chkp = -1;
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static int hf_ltp_data_rpt = -1;
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static int hf_ltp_data_clidata = -1;
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/* LTP Report Segment variable */
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static int hf_ltp_rpt_sno = -1;
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static int hf_ltp_rpt_chkp = -1;
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static int hf_ltp_rpt_ub = -1;
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static int hf_ltp_rpt_lb = -1;
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static int hf_ltp_rpt_clm_cnt = -1;
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static int hf_ltp_rpt_clm_off = -1;
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static int hf_ltp_rpt_clm_len = -1;
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/* LTP Report Ack Segment Variable */
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static int hf_ltp_rpt_ack_sno = -1;
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/* LTP Session Management Segment Variable */
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static int hf_ltp_cancel_code = -1;
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/* LTP Header Extension Segment */
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static int hf_ltp_hdr_extn_tag = -1;
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static int hf_ltp_hdr_extn_len = -1;
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static int hf_ltp_hdr_extn_val = -1;
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/* LTP Trailer Extension Segment */
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static int hf_ltp_trl_extn_tag = -1;
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static int hf_ltp_trl_extn_len = -1;
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static int hf_ltp_trl_extn_val = -1;
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static const value_string ltp_type_codes[] = {
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{0x0, "Red data, NOT {Checkpoint, EORP or EOB}"},
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{0x1, "Red data, Checkpoint, NOT {EORP or EOB}"},
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{0x2, "Red data, Checkpoint, EORP, NOT EOB"},
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{0x3, "Red data, Checkpoint, EORP, EOB"},
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{0x4, "Green data, NOT EOB"},
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{0x5, "Green data, undefined"},
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{0x6, "Green data, undefined"},
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{0x7, "Green data, EOB"},
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{0x8, "Report segment"},
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{0x9, "Report-acknowledgment segment"},
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{0xa, "Control segment, undefined"},
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{0xb, "Control segment, undefined"},
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{0xc, "Cancel segment from block sender"},
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{0xd, "Cancel-acknowledgment segment to block sender"},
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{0xe, "Cancel segment from block receiver"},
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{0xf, "Cancel-acknowledgment segment to block receiver"},
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{0,NULL}
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};
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static const value_string ltp_type_col_info[] = {
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{0x0, "Red data"},
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{0x1, "Red data"},
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{0x2, "Red data"},
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{0x3, "Red data"},
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{0x4, "Green data"},
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{0x5, "Green data"},
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{0x6, "Green data"},
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{0x7, "Green data"},
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{0x8, "Report segment"},
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{0x9, "Report ack segment"},
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{0xa, "Control segment"},
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{0xb, "Control segment"},
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{0xc, "Cancel segment"},
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{0xd, "Cancel ack segment"},
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{0xe, "Cancel segment"},
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{0xf, "Cancel ack segment"},
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{0, NULL}
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};
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static const value_string ltp_cancel_codes[] = {
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{0x00, "Client service canceled session"},
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{0x01, "Unreachable client service"},
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{0x02, "Retransmission limit exceeded"},
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{0x03, "Miscolored segment"},
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{0x04, "A system error"},
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{0x05, "Exceeded the Retransmission-Cycles limit"},
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{0, NULL}
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};
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static const value_string extn_tag_codes[] = {
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{0x00, "LTP authentication extension"},
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{0x01, "LTP cookie extension"},
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{0, NULL}
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};
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static guint ltp_port = 1113;
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/* Initialize the subtree pointers */
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static gint ett_ltp = -1;
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static gint ett_ltp_hdr = -1;
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static gint ett_hdr_session = -1;
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static gint ett_hdr_extn = -1;
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static gint ett_data_segm = -1;
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static gint ett_data_data_segm = -1;
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static gint ett_rpt_segm = -1;
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static gint ett_rpt_clm = -1;
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static gint ett_rpt_ack_segm = -1;
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static gint ett_session_mgmt = -1;
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static gint ett_trl_extn = -1;
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static int
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dissect_data_segment(proto_tree *ltp_tree, tvbuff_t *tvb,packet_info *pinfo,int frame_offset){
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guint64 client_id;
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guint64 offset;
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guint64 length;
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guint64 chkp_sno;
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guint64 rpt_sno;
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int segment_offset = 0;
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int client_id_size;
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int offset_size;
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int length_size;
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int chkp_sno_size;
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int rpt_sno_size;
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int bundle_size = 0;
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int dissected_data_size = 0;
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int data_count = 1;
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proto_item *ltp_data_item;
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proto_item *ltp_data_data_item;
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proto_tree *ltp_data_tree;
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proto_tree *ltp_data_data_tree;
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tvbuff_t *datatvb;
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/* Extract the info for the data segment */
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client_id = evaluate_sdnv_64(tvb,frame_offset + segment_offset,&client_id_size);
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segment_offset+= client_id_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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/* This would mean the data segment is incomplete */
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return 0;
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}
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offset = evaluate_sdnv_64(tvb,frame_offset + segment_offset,&offset_size);
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segment_offset+= offset_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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/* This would mean the data segment is incomplete */
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return 0;
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}
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length = evaluate_sdnv_64(tvb,frame_offset + segment_offset,&length_size);
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segment_offset+= length_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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/* This would mean the data segment is incomplete */
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return 0;
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}
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chkp_sno = evaluate_sdnv_64(tvb,frame_offset + segment_offset,&chkp_sno_size);
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segment_offset+= chkp_sno_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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/* This would mean the data segment is incomplete */
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return 0;
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}
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rpt_sno = evaluate_sdnv_64(tvb,frame_offset + segment_offset,&rpt_sno_size);
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segment_offset+= rpt_sno_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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/* This would mean the data segment is incomplete */
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return 0;
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}
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/* Adding size of the data */
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segment_offset+= length;
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if((unsigned)(frame_offset + segment_offset) > tvb_length(tvb)){
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/* This would mean the data segment is incomplete */
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return 0;
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}
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/* Create a subtree for data segment and add the other fields under it */
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ltp_data_item = proto_tree_add_text(ltp_tree, tvb,frame_offset, segment_offset, "Data Segment");
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ltp_data_tree = proto_item_add_subtree(ltp_data_item, ett_data_segm);
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proto_tree_add_uint64(ltp_data_tree,hf_ltp_data_clid, tvb, frame_offset,client_id_size,client_id);
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frame_offset += client_id_size;
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proto_tree_add_uint64(ltp_data_tree, hf_ltp_data_offset, tvb, frame_offset,offset_size, offset);
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frame_offset += offset_size;
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proto_tree_add_uint64(ltp_data_tree,hf_ltp_data_length, tvb, frame_offset,length_size,length);
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frame_offset += length_size;
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proto_tree_add_uint64(ltp_data_tree, hf_ltp_data_chkp, tvb, frame_offset,chkp_sno_size, chkp_sno);
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frame_offset += chkp_sno_size;
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proto_tree_add_uint64(ltp_data_tree, hf_ltp_data_rpt, tvb, frame_offset,rpt_sno_size, rpt_sno);
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frame_offset += rpt_sno_size;
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while((unsigned)dissected_data_size < length)
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{
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ltp_data_data_item = proto_tree_add_text(ltp_data_tree, tvb,frame_offset, 0, "Data[%d]",data_count);
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ltp_data_data_tree = proto_item_add_subtree(ltp_data_data_item, ett_data_data_segm);
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datatvb = tvb_new_subset(tvb, frame_offset, length - dissected_data_size, tvb_length(tvb));
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bundle_size = dissect_complete_bundle(datatvb, pinfo, ltp_data_data_tree);
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if(bundle_size == 0) { /*Couldn't parse bundle*/
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col_set_str(pinfo->cinfo, COL_INFO, "Dissection Failed");
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return 0; /*Give up*/
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}
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frame_offset += bundle_size;
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dissected_data_size += bundle_size;
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data_count++;
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}
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return segment_offset;
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}
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static int
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dissect_report_segment(proto_tree *ltp_tree, tvbuff_t *tvb,int frame_offset){
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guint64 rpt_sno;
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guint64 chkp_sno;
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guint64 upper_bound;
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guint64 lower_bound;
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int rcpt_clm_cnt;
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guint64 *offset;
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guint64 *length;
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int rpt_sno_size;
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int chkp_sno_size;
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int upper_bound_size;
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int lower_bound_size;
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int rcpt_clm_cnt_size;
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int *offset_size;
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int *length_size;
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int segment_offset = 0;
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int i;
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proto_item *ltp_rpt_item;
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proto_item *ltp_rpt_clm_item;
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proto_tree *ltp_rpt_tree;
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proto_tree *ltp_rpt_clm_tree;
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/* Extract the report segment info */
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rpt_sno = evaluate_sdnv_64(tvb,frame_offset, &rpt_sno_size);
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segment_offset+= rpt_sno_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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return 0;
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}
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chkp_sno = evaluate_sdnv_64(tvb,frame_offset + segment_offset, &chkp_sno_size);
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segment_offset+=chkp_sno_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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return 0;
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}
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upper_bound = evaluate_sdnv(tvb,frame_offset + segment_offset, &upper_bound_size);
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segment_offset += upper_bound_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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return 0;
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}
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lower_bound = evaluate_sdnv(tvb,frame_offset + segment_offset, &lower_bound_size);
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segment_offset += lower_bound_size;
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if((unsigned)(frame_offset + segment_offset) >= tvb_length(tvb)){
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return 0;
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}
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rcpt_clm_cnt = evaluate_sdnv(tvb,frame_offset + segment_offset, &rcpt_clm_cnt_size);
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segment_offset += rcpt_clm_cnt_size;
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if((unsigned)(frame_offset + segment_offset) > tvb_length(tvb)){
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return 0;
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}
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offset = ep_alloc(sizeof(guint64) * rcpt_clm_cnt);
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offset_size = ep_alloc(sizeof(int) * rcpt_clm_cnt);
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length = ep_alloc(sizeof(guint64) * rcpt_clm_cnt);
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length_size = ep_alloc(sizeof(int) * rcpt_clm_cnt);
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for(i = 0; i<rcpt_clm_cnt; i++){
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*(offset + i) = evaluate_sdnv(tvb,frame_offset + segment_offset, offset_size + i);
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segment_offset += *(offset_size + i);
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if((unsigned)(frame_offset + segment_offset) > tvb_length(tvb)){
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return 0;
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}
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*(length + i ) = evaluate_sdnv(tvb,frame_offset + segment_offset, length_size + i);
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segment_offset += *(length_size + i );
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if((unsigned)(frame_offset + segment_offset) > tvb_length(tvb)){
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return 0;
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}
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}
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|
||||
/* Create the subtree for report segment under the main LTP tree and all the report segment fields under it */
|
||||
ltp_rpt_item = proto_tree_add_text(ltp_tree, tvb,frame_offset, segment_offset, "Report Segment");
|
||||
ltp_rpt_tree = proto_item_add_subtree(ltp_rpt_item, ett_rpt_segm);
|
||||
|
||||
proto_tree_add_uint64(ltp_rpt_tree, hf_ltp_rpt_sno, tvb, frame_offset,rpt_sno_size, rpt_sno);
|
||||
frame_offset += rpt_sno_size;
|
||||
|
||||
proto_tree_add_uint64(ltp_rpt_tree, hf_ltp_rpt_chkp, tvb, frame_offset,chkp_sno_size, chkp_sno);
|
||||
frame_offset += chkp_sno_size;
|
||||
|
||||
proto_tree_add_uint64(ltp_rpt_tree, hf_ltp_rpt_ub, tvb, frame_offset,upper_bound_size, upper_bound);
|
||||
frame_offset += upper_bound_size;
|
||||
|
||||
proto_tree_add_uint64(ltp_rpt_tree, hf_ltp_rpt_lb, tvb, frame_offset,lower_bound_size, lower_bound);
|
||||
frame_offset += lower_bound_size;
|
||||
|
||||
proto_tree_add_uint(ltp_rpt_tree, hf_ltp_rpt_clm_cnt, tvb, frame_offset,rcpt_clm_cnt_size, rcpt_clm_cnt);
|
||||
frame_offset += rcpt_clm_cnt_size;
|
||||
|
||||
ltp_rpt_clm_item = proto_tree_add_text(ltp_rpt_tree, tvb,frame_offset, segment_offset - frame_offset, "Reception claims");
|
||||
ltp_rpt_clm_tree = proto_item_add_subtree(ltp_rpt_clm_item, ett_rpt_clm);
|
||||
|
||||
/* There can be multiple reception claims in the same report segment */
|
||||
for(i = 0; i<rcpt_clm_cnt; i++){
|
||||
proto_tree_add_uint64_format(ltp_rpt_clm_tree, hf_ltp_rpt_clm_off, tvb, frame_offset,*(offset_size + i), *(offset + i),
|
||||
"Offset[%d] : %"G_GINT64_MODIFIER"d", i, *(offset + i));
|
||||
frame_offset += *(offset_size + i);
|
||||
|
||||
proto_tree_add_uint64_format(ltp_rpt_clm_tree, hf_ltp_rpt_clm_len, tvb, frame_offset,*(length_size + i), *(length + i),
|
||||
"Length[%d] : %"G_GINT64_MODIFIER"d",i, *(length + i));
|
||||
frame_offset += *(length_size + i);
|
||||
}
|
||||
return segment_offset;
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
dissect_report_ack_segment(proto_tree *ltp_tree, tvbuff_t *tvb,int frame_offset){
|
||||
guint64 rpt_sno;
|
||||
|
||||
int rpt_sno_size;
|
||||
int segment_offset = 0;
|
||||
|
||||
proto_item *ltp_rpt_ack_item;
|
||||
proto_tree *ltp_rpt_ack_tree;
|
||||
|
||||
/* Extracing receipt serial number info */
|
||||
rpt_sno = evaluate_sdnv_64(tvb,frame_offset, &rpt_sno_size);
|
||||
segment_offset += rpt_sno_size;
|
||||
|
||||
if((unsigned)(frame_offset + segment_offset) > tvb_length(tvb)){
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Creating tree for the report ack segment */
|
||||
ltp_rpt_ack_item = proto_tree_add_text(ltp_tree, tvb,frame_offset, segment_offset, "Report Ack Segment");
|
||||
ltp_rpt_ack_tree = proto_item_add_subtree(ltp_rpt_ack_item, ett_rpt_ack_segm);
|
||||
|
||||
proto_tree_add_uint64(ltp_rpt_ack_tree, hf_ltp_rpt_ack_sno, tvb, frame_offset,rpt_sno_size, rpt_sno);
|
||||
return segment_offset;
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
dissect_cancel_segment(proto_tree * ltp_tree, tvbuff_t *tvb,int frame_offset){
|
||||
guint8 reason_code;
|
||||
|
||||
proto_item *ltp_cancel_item;
|
||||
proto_tree *ltp_cancel_tree;
|
||||
|
||||
/* The cancel segment has only one byte, which contains the reason code. */
|
||||
reason_code = tvb_get_guint8(tvb,frame_offset);
|
||||
|
||||
/* Creating tree for the cancel segment */
|
||||
ltp_cancel_item = proto_tree_add_text(ltp_tree, tvb,frame_offset, 1, "Cancel Segment");
|
||||
ltp_cancel_tree = proto_item_add_subtree(ltp_cancel_item, ett_session_mgmt);
|
||||
|
||||
proto_tree_add_uint_format_value(ltp_cancel_tree, hf_ltp_cancel_code, tvb, frame_offset, 1, reason_code,
|
||||
"%x (%s)", reason_code, val_to_str(reason_code,ltp_cancel_codes,"Reserved"));
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
dissect_header_extn(proto_tree *ltp_tree, tvbuff_t *tvb,int frame_offset,int hdr_extn_cnt){
|
||||
guint8 extn_type[LTP_MAX_HDR_EXTN];
|
||||
guint64 length[LTP_MAX_HDR_EXTN];
|
||||
guint64 value[LTP_MAX_HDR_EXTN];
|
||||
|
||||
int length_size[LTP_MAX_HDR_EXTN];
|
||||
int value_size[LTP_MAX_HDR_EXTN];
|
||||
|
||||
int i;
|
||||
int extn_offset = 0;
|
||||
|
||||
proto_item *ltp_hdr_extn_item;
|
||||
proto_tree *ltp_hdr_extn_tree;
|
||||
|
||||
/* There can be more than one header extensions */
|
||||
for(i = 0; i < hdr_extn_cnt; i++){
|
||||
extn_type[i] = tvb_get_guint8(tvb,frame_offset);
|
||||
extn_offset++;
|
||||
|
||||
if((unsigned)(frame_offset + extn_offset) >= tvb_length(tvb)){
|
||||
return 0;
|
||||
}
|
||||
length[i] = evaluate_sdnv_64(tvb,frame_offset,&length_size[i]);
|
||||
extn_offset += length_size[i];
|
||||
if((unsigned)(frame_offset + extn_offset) >= tvb_length(tvb)){
|
||||
return 0;
|
||||
}
|
||||
value[i] = evaluate_sdnv_64(tvb,frame_offset,&value_size[i]);
|
||||
extn_offset += value_size[i];
|
||||
if((unsigned)(frame_offset + extn_offset) >= tvb_length(tvb)){
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
ltp_hdr_extn_item = proto_tree_add_text(ltp_tree, tvb,frame_offset, extn_offset, "Header Extension");
|
||||
ltp_hdr_extn_tree = proto_item_add_subtree(ltp_hdr_extn_item, ett_hdr_extn);
|
||||
|
||||
for(i = 0; i < hdr_extn_cnt; i++){
|
||||
proto_tree_add_uint_format_value(ltp_hdr_extn_tree, hf_ltp_hdr_extn_tag, tvb, frame_offset, 1, extn_type[i], "%x (%s)", extn_type[i], val_to_str(extn_type[i],extn_tag_codes,"Unassigned/Reserved"));
|
||||
|
||||
proto_tree_add_uint64_format(ltp_hdr_extn_tree, hf_ltp_hdr_extn_len, tvb, frame_offset, length_size[i],length[i], "Length [%d]: %"G_GINT64_MODIFIER"d",i+1,length[i]);
|
||||
frame_offset += length_size[i];
|
||||
|
||||
proto_tree_add_uint64_format(ltp_hdr_extn_tree, hf_ltp_hdr_extn_val, tvb, frame_offset, value_size[i],value[i], "Value [%d]: %"G_GINT64_MODIFIER"d",i+1,value[i]);
|
||||
frame_offset += value_size[i];
|
||||
}
|
||||
return extn_offset;
|
||||
}
|
||||
|
||||
static int
|
||||
dissect_trailer_extn(proto_tree *ltp_tree, tvbuff_t *tvb,int frame_offset,int trl_extn_cnt){
|
||||
guint8 extn_type[LTP_MAX_TRL_EXTN];
|
||||
guint64 length[LTP_MAX_TRL_EXTN];
|
||||
guint64 value[LTP_MAX_TRL_EXTN];
|
||||
|
||||
int length_size[LTP_MAX_TRL_EXTN];
|
||||
int value_size[LTP_MAX_TRL_EXTN];
|
||||
|
||||
int i;
|
||||
int extn_offset = 0;
|
||||
|
||||
proto_item *ltp_trl_extn_item;
|
||||
proto_tree *ltp_trl_extn_tree;
|
||||
|
||||
DISSECTOR_ASSERT(trl_extn_cnt < LTP_MAX_TRL_EXTN);
|
||||
|
||||
for(i = 0; i < trl_extn_cnt; i++){
|
||||
extn_type[i] = tvb_get_guint8(tvb,frame_offset);
|
||||
extn_offset++;
|
||||
|
||||
if((unsigned)(frame_offset + extn_offset) >= tvb_length(tvb)){
|
||||
return 0;
|
||||
}
|
||||
|
||||
length[i] = evaluate_sdnv_64(tvb,frame_offset,&length_size[i]);
|
||||
extn_offset += length_size[i];
|
||||
|
||||
if((unsigned)(frame_offset + extn_offset) >= tvb_length(tvb)){
|
||||
return 0;
|
||||
}
|
||||
|
||||
value[i] = evaluate_sdnv_64(tvb,frame_offset,&value_size[i]);
|
||||
extn_offset += value_size[i];
|
||||
|
||||
if((unsigned)(frame_offset + extn_offset) >= tvb_length(tvb)){
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
ltp_trl_extn_item = proto_tree_add_text(ltp_tree, tvb,frame_offset, extn_offset, "Header Extension");
|
||||
ltp_trl_extn_tree = proto_item_add_subtree(ltp_trl_extn_item, ett_trl_extn);
|
||||
|
||||
for(i = 0; i < trl_extn_cnt; i++){
|
||||
proto_tree_add_uint_format_value(ltp_trl_extn_tree, hf_ltp_trl_extn_tag, tvb, frame_offset, 1, extn_type[i], "%x (%s)", extn_type[i], val_to_str(extn_type[i],extn_tag_codes,"Unassigned/Reserved"));
|
||||
|
||||
proto_tree_add_uint64_format(ltp_trl_extn_tree, hf_ltp_trl_extn_tag, tvb, frame_offset, length_size[i], length[i], "Length [%d]: %"G_GINT64_MODIFIER"d",i+1,length[i]);
|
||||
frame_offset += length_size[i];
|
||||
|
||||
proto_tree_add_uint64_format(ltp_trl_extn_tree, hf_ltp_trl_extn_val, tvb, frame_offset, value_size[i], value[i], "Value [%d]: %"G_GINT64_MODIFIER"d",i+0,value[i]);
|
||||
frame_offset += value_size[i];
|
||||
}
|
||||
return extn_offset;
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
dissect_ltp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
||||
{
|
||||
proto_item *ti = NULL;
|
||||
proto_tree *ltp_tree = NULL;
|
||||
int frame_offset;
|
||||
int header_offset;
|
||||
int segment_offset = 0;
|
||||
int hdr_extn_offset = 0;
|
||||
int trl_extn_offset = 0;
|
||||
|
||||
guint8 ltp_hdr;
|
||||
gint ltp_type;
|
||||
guint8 ltp_extn_cnt;
|
||||
gint hdr_extn_cnt;
|
||||
gint trl_extn_cnt;
|
||||
|
||||
guint64 engine_id;
|
||||
guint64 session_num;
|
||||
int engine_id_size;
|
||||
int session_num_size;
|
||||
|
||||
proto_item *ltp_header_item = NULL;
|
||||
proto_item *ltp_session_item = NULL;
|
||||
|
||||
proto_tree *ltp_header_tree = NULL;
|
||||
proto_tree *ltp_session_tree = NULL;
|
||||
|
||||
/* Check that there's enough data */
|
||||
if(tvb_length(tvb) < LTP_MIN_DATA_BUFFER){
|
||||
return 0;
|
||||
}
|
||||
frame_offset = 0;
|
||||
header_offset = 0;
|
||||
|
||||
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LTP Segment");
|
||||
|
||||
/* Extract all the header info from the packet */
|
||||
ltp_hdr = tvb_get_guint8(tvb, frame_offset);
|
||||
header_offset++;
|
||||
|
||||
engine_id = evaluate_sdnv_64(tvb,frame_offset + header_offset,&engine_id_size);
|
||||
header_offset += engine_id_size;
|
||||
if((unsigned)header_offset >= tvb_length(tvb)){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
|
||||
session_num = evaluate_sdnv_64(tvb,frame_offset + header_offset,&session_num_size);
|
||||
header_offset += session_num_size;
|
||||
if((unsigned)header_offset >= tvb_length(tvb)){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
|
||||
ti = proto_tree_add_item(tree, proto_ltp, tvb, 0, -1, FALSE);
|
||||
ltp_tree = proto_item_add_subtree(ti, ett_ltp);
|
||||
|
||||
/* Adding Header Subtree */
|
||||
ltp_header_item = proto_tree_add_text(ltp_tree, tvb, frame_offset, header_offset+1, "LTP Header");
|
||||
ltp_header_tree = proto_item_add_subtree(ltp_header_item, ett_ltp_hdr);
|
||||
|
||||
proto_tree_add_uint(ltp_header_tree,hf_ltp_version,tvb,frame_offset,1,hi_nibble(ltp_hdr));
|
||||
ltp_type = lo_nibble(ltp_hdr);
|
||||
proto_tree_add_uint_format_value(ltp_header_tree,hf_ltp_type,tvb,frame_offset,1,ltp_type,"%x (%s)",
|
||||
ltp_type,val_to_str(ltp_type,ltp_type_codes,"Invalid"));
|
||||
|
||||
frame_offset++;
|
||||
/* Adding the session id subtree */
|
||||
ltp_session_item = proto_tree_add_item(ltp_header_item,hf_ltp_session_id,tvb,frame_offset, engine_id_size + session_num_size,FALSE);
|
||||
ltp_session_tree = proto_item_add_subtree(ltp_session_item,ett_hdr_session);
|
||||
proto_tree_add_uint64(ltp_session_tree,hf_ltp_session_orig,tvb,frame_offset,engine_id_size,engine_id);
|
||||
frame_offset+=engine_id_size;
|
||||
proto_tree_add_uint64(ltp_session_tree,hf_ltp_session_no, tvb, frame_offset,session_num_size,session_num);
|
||||
frame_offset+=session_num_size;
|
||||
|
||||
/* Adding Extension count to the header tree */
|
||||
ltp_extn_cnt = tvb_get_guint8(tvb,frame_offset);
|
||||
hdr_extn_cnt = hi_nibble(ltp_extn_cnt);
|
||||
trl_extn_cnt = lo_nibble(ltp_extn_cnt);
|
||||
|
||||
proto_tree_add_uint(ltp_header_tree,hf_ltp_hdr_extn_cnt,tvb,frame_offset,1,hdr_extn_cnt);
|
||||
proto_tree_add_uint(ltp_header_tree,hf_ltp_trl_extn_cnt,tvb,frame_offset,1,trl_extn_cnt);
|
||||
frame_offset++;
|
||||
|
||||
if((unsigned)frame_offset >= tvb_length(tvb)){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Check if there are any header extensions */
|
||||
if(hdr_extn_cnt > 0){
|
||||
hdr_extn_offset = dissect_header_extn(ltp_tree, tvb, frame_offset,hdr_extn_cnt);
|
||||
if(hdr_extn_offset == 0){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
frame_offset += hdr_extn_offset;
|
||||
}
|
||||
|
||||
if((unsigned)frame_offset >= tvb_length(tvb)){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Call sub routines to handle the segment content*/
|
||||
if((ltp_type >= 0) && (ltp_type < 8)){
|
||||
segment_offset = dissect_data_segment(ltp_tree,tvb,pinfo,frame_offset);
|
||||
if(segment_offset == 0){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
else if(ltp_type == 8){
|
||||
segment_offset = dissect_report_segment(ltp_tree,tvb,frame_offset);
|
||||
if(segment_offset == 0){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
else if(ltp_type == 9){
|
||||
segment_offset = dissect_report_ack_segment(ltp_tree,tvb,frame_offset);
|
||||
if(segment_offset == 0){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
else if(ltp_type == 12 || ltp_type == 14){
|
||||
segment_offset = dissect_cancel_segment(ltp_tree,tvb,frame_offset);
|
||||
if(segment_offset == 0){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
frame_offset += segment_offset;
|
||||
col_set_str(pinfo->cinfo, COL_INFO, val_to_str(ltp_type,ltp_type_col_info,"Protocol Error"));
|
||||
/* Check to see if there are any trailer extensions */
|
||||
if(trl_extn_cnt > 0){
|
||||
if((unsigned)frame_offset >= tvb_length(tvb)){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
trl_extn_offset = dissect_trailer_extn(ltp_tree, tvb, frame_offset,trl_extn_cnt);
|
||||
if(trl_extn_offset == 0){
|
||||
col_set_str(pinfo->cinfo, COL_INFO, "Protocol Error");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
/* Return the amount of data this dissector was able to dissect */
|
||||
return tvb_length(tvb);
|
||||
}
|
||||
|
||||
/* Register the protocol with Wireshark */
|
||||
void
|
||||
proto_register_ltp(void)
|
||||
{
|
||||
module_t *ltp_module;
|
||||
|
||||
static hf_register_info hf[] = {
|
||||
{&hf_ltp_version,
|
||||
{"LTP Version","ltp.version",
|
||||
FT_UINT8,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_type,
|
||||
{"LTP Type","ltp.type",
|
||||
FT_UINT8,BASE_HEX,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_session_id,
|
||||
{"Session ID","ltp.session",
|
||||
FT_NONE,BASE_NONE,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_session_orig,
|
||||
{"Session originator","ltp.session.orig",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_session_no,
|
||||
{"Session number","ltp.session.number",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_hdr_extn_cnt,
|
||||
{"Header Extension Count","ltp.hdr.extn.cnt",
|
||||
FT_UINT8,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_trl_extn_cnt,
|
||||
{"Trailer Extension Count","ltp.trl.extn.cnt",
|
||||
FT_UINT8,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_data_clid,
|
||||
{"Client service ID","ltp.data.client.id",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_data_offset,
|
||||
{"Offset","ltp.data.offset",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_data_length,
|
||||
{"Length","ltp.data.length",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_data_chkp,
|
||||
{"Checkpoint serial number","ltp.data.chkp",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_data_rpt,
|
||||
{"Report serial number","ltp.data.rpt",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_data_clidata,
|
||||
{"Client service data","ltp.data.data",
|
||||
FT_BYTES,BASE_NONE,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_sno,
|
||||
{"Report serial number","ltp.rpt.sno",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_chkp,
|
||||
{"Checkpoint serial number","ltp.rpt.chkp",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_ub,
|
||||
{"Upper bound","ltp.rpt.ub",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_lb,
|
||||
{"Lower bound","ltp.rpt.lb",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_clm_cnt,
|
||||
{"Reception claim count","ltp.rpt.clm.cnt",
|
||||
FT_UINT8,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_clm_off,
|
||||
{"Offset","ltp.rpt.clm.off",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_clm_len,
|
||||
{"Length","ltp.rpt.clm.len",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_rpt_ack_sno,
|
||||
{"Report serial number","ltp.rpt.ack.sno",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_cancel_code,
|
||||
{"Cancel code","ltp.cancel.code",
|
||||
FT_UINT8,BASE_HEX,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_hdr_extn_tag,
|
||||
{"Extension tag","ltp.hdr.extn.tag",
|
||||
FT_UINT8,BASE_HEX,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_hdr_extn_len,
|
||||
{"Length","ltp.hdr.extn.len",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_hdr_extn_val,
|
||||
{"Value","ltp.hdr.extn.val",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_trl_extn_tag,
|
||||
{"Extension tag","ltp.hdr.extn.tag",
|
||||
FT_UINT8,BASE_HEX,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_trl_extn_len,
|
||||
{"Length","ltp.hdr.extn.len",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
},
|
||||
{&hf_ltp_trl_extn_val,
|
||||
{"Value","ltp.hdr.extn.val",
|
||||
FT_UINT64,BASE_DEC,NULL, 0x0, NULL, HFILL}
|
||||
}
|
||||
};
|
||||
|
||||
/* Setup protocol subtree array */
|
||||
static gint *ett[] = {
|
||||
&ett_ltp,
|
||||
&ett_ltp_hdr,
|
||||
&ett_hdr_session,
|
||||
&ett_hdr_extn,
|
||||
&ett_data_segm,
|
||||
&ett_data_data_segm,
|
||||
&ett_rpt_segm,
|
||||
&ett_rpt_clm,
|
||||
&ett_rpt_ack_segm,
|
||||
&ett_session_mgmt,
|
||||
&ett_trl_extn
|
||||
};
|
||||
|
||||
/* Register the protocol name and description */
|
||||
proto_ltp = proto_register_protocol("Licklider Transmission Protocol",
|
||||
"LTP", "ltp");
|
||||
|
||||
proto_register_field_array(proto_ltp, hf, array_length(hf));
|
||||
proto_register_subtree_array(ett, array_length(ett));
|
||||
ltp_module = prefs_register_protocol(proto_ltp, proto_reg_handoff_ltp);
|
||||
|
||||
prefs_register_uint_preference(ltp_module, "udp.port", "LTP UDP Port",
|
||||
"UDP Port to accept LTP Connections",
|
||||
10, <p_port);
|
||||
}
|
||||
|
||||
void
|
||||
proto_reg_handoff_ltp(void)
|
||||
{
|
||||
static gboolean initialized = FALSE;
|
||||
static dissector_handle_t ltp_handle;
|
||||
static int currentPort;
|
||||
|
||||
if (!initialized) {
|
||||
ltp_handle = new_create_dissector_handle(dissect_ltp, proto_ltp);
|
||||
initialized = TRUE;
|
||||
} else {
|
||||
dissector_delete("udp.port", currentPort, ltp_handle);
|
||||
}
|
||||
|
||||
currentPort = ltp_port;
|
||||
|
||||
dissector_add("udp.port", currentPort, ltp_handle);
|
||||
}
|
||||
Loading…
Reference in New Issue