forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Cast away some implicit 64-bit-to-32-bit conversion errors due to use of sizeof. Cast away some implicit 64-bit-to-32-bit conversion errors due to use of strtol() and strtoul(). Change some data types to avoid those implicit conversion warnings. When assigning a constant to a float, make sure the constant isn't a double, by appending "f" to the constant. Constify a bunch of variables, parameters, and return values to eliminate warnings due to strings being given const qualifiers. Cast away those warnings in some cases where an API we don't control forces us to do so. Enable a bunch of additional warnings by default. Note why at least some of the other warnings aren't enabled. randpkt.c and text2pcap.c are used to build programs, so they don't need to be in EXTRA_DIST. If the user specifies --enable-warnings-as-errors, add -Werror *even if the user specified --enable-extra-gcc-flags; assume they know what they're doing and are willing to have the compile fail due to the extra GCC warnings being treated as errors. svn path=/trunk/; revision=46748
584 lines
20 KiB
C
584 lines
20 KiB
C
/* packet-reload-framing.c
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* Routines for REsource LOcation And Discovery (RELOAD) Framing
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* Author: Stephane Bryant <sbryant@glycon.org>
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* Copyright 2010 Stonyfish Inc.
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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
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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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* Please refer to the following specs for protocol detail:
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* - draft-ietf-p2psip-base-15
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*/
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#include "config.h"
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#include <epan/conversation.h>
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#include <epan/expert.h>
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#include <packet-tcp.h>
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/* Initialize the protocol and registered fields */
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static int proto_reload_framing = -1;
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static int hf_reload_framing_type = -1;
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static int hf_reload_framing_sequence = -1;
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static int hf_reload_framing_ack_sequence = -1;
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static int hf_reload_framing_message = -1;
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static int hf_reload_framing_message_length = -1;
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static int hf_reload_framing_message_data = -1;
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static int hf_reload_framing_received = -1;
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static int hf_reload_framing_parsed_received = -1;
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static int hf_reload_framing_duplicate = -1;
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static int hf_reload_framing_response_in = -1;
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static int hf_reload_framing_response_to = -1;
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static int hf_reload_framing_time = -1;
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static dissector_handle_t reload_handle;
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/* Structure containing transaction specific information */
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typedef struct _reload_frame_t {
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guint32 data_frame;
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guint32 ack_frame;
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nstime_t req_time;
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} reload_frame_t;
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/* Structure containing conversation specific information */
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typedef struct _reload_frame_conv_info_t {
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emem_tree_t *transaction_pdus;
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} reload_conv_info_t;
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/* RELOAD Message classes = (message_code & 0x1) (response = request +1) */
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#define DATA 128
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#define ACK 129
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/* Initialize the subtree pointers */
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static gint ett_reload_framing = -1;
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static gint ett_reload_framing_message = -1;
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static gint ett_reload_framing_received = -1;
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#define UDP_PORT_RELOAD 6084
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#define TCP_PORT_RELOAD 6084
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#define MIN_HDR_LENGTH 9
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#define MIN_RELOADDATA_HDR_LENGTH 38
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#define RELOAD_TOKEN 0xd2454c4f
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static const value_string types[] = {
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{DATA, "DATA"},
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{ACK, "ACK"},
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{0x00, NULL}
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};
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static guint
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get_reload_framing_message_length(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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/* Get the type */
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guint32 length = 9;
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if (tvb_get_guint8(tvb, offset) == DATA) {
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length = 1 + 4 + 3 + tvb_get_ntoh24(tvb, 1 + 4);
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}
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return length;
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}
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static int
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dissect_reload_framing_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *reload_framing_tree;
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guint32 relo_token;
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guint32 message_length = 0;
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emem_tree_key_t transaction_id_key[4];
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guint32 *key_save, len_save;
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guint32 sequence;
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guint effective_length;
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guint16 offset;
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conversation_t *conversation;
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reload_conv_info_t *reload_framing_info = NULL;
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reload_frame_t * reload_frame;
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guint8 type;
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offset = 0;
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effective_length = tvb_length(tvb);
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/* First, make sure we have enough data to do the check. */
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if (effective_length < MIN_HDR_LENGTH)
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return 0;
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conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
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if (conversation)
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reload_framing_info = conversation_get_proto_data(conversation, proto_reload_framing);
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/* Get the type
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* http://tools.ietf.org/html/draft-ietf-p2psip-base-12
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* 5.6.2. Framing Header
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*/
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type = tvb_get_guint8(tvb, 0);
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switch(type) {
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case DATA:
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/* in the data type, check the reload token to be sure this
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* is a reLoad packet
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*/
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if (effective_length < 12) /* [type + seq + length + token] */
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return 0;
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message_length = tvb_get_ntoh24(tvb, 1 + 4);
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if (message_length < MIN_RELOADDATA_HDR_LENGTH) {
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return 0;
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}
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relo_token = tvb_get_ntohl(tvb,1 + 4 + 3);
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if (relo_token != RELOAD_TOKEN) {
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return 0;
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}
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break;
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case ACK:
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/* Require previous ACK (i.e., reload_framing_info attached to conversation). */
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if (effective_length < 9 || ! reload_framing_info) {
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return 0;
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}
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break;
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default:
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return 0;
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}
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/* The message seems to be a valid RELOAD framing message! */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RELOAD Frame");
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col_clear(pinfo->cinfo, COL_INFO);
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/* Create the transaction key which may be used to track the conversation */
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sequence = tvb_get_ntohl(tvb, 1);
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transaction_id_key[0].length = 1;
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transaction_id_key[0].key = &sequence; /* sequence number */
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/* When the se_tree_* functions iterate through the keys, they
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* perform pointer arithmetic with guint32s, so we have to divide
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* our length fields by that to make things work, but we still want
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* to g_malloc and memcpy the entire amounts, since those both operate
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* in raw bytes. */
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if (type==DATA) {
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transaction_id_key[1].length = 1;
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transaction_id_key[1].key = &pinfo->srcport;
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transaction_id_key[2].length = (pinfo->src.len) / (guint)sizeof(guint32);
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transaction_id_key[2].key = g_malloc(pinfo->src.len);
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memcpy(transaction_id_key[2].key, pinfo->src.data, pinfo->src.len);
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}
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else {
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transaction_id_key[1].length = 1;
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transaction_id_key[1].key = &pinfo->destport;
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transaction_id_key[2].length = (pinfo->dst.len) / (guint)sizeof(guint32);
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transaction_id_key[2].key = g_malloc(pinfo->dst.len);
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memcpy(transaction_id_key[2].key, pinfo->dst.data, pinfo->dst.len);
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}
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transaction_id_key[3].length=0;
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transaction_id_key[3].key=NULL;
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/* The tree functions are destructive to this part of the key, so save the
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* proper values here and restore them after each call. */
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key_save = transaction_id_key[2].key;
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len_save = transaction_id_key[2].length;
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if (!conversation) {
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conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
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}
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/*
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* Do we already have a state structure for this conv
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*/
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if (!reload_framing_info) {
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/* No. Attach that information to the conversation, and add
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* it to the list of information structures.
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*/
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reload_framing_info = se_alloc(sizeof(reload_conv_info_t));
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reload_framing_info->transaction_pdus = se_tree_create_non_persistent(EMEM_TREE_TYPE_RED_BLACK,
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"reload_framing_transaction_pdus");
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conversation_add_proto_data(conversation, proto_reload_framing, reload_framing_info);
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}
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if (!pinfo->fd->flags.visited) {
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if ((reload_frame =
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se_tree_lookup32_array(reload_framing_info->transaction_pdus, transaction_id_key)) == NULL) {
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transaction_id_key[2].key = key_save;
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transaction_id_key[2].length = len_save;
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reload_frame = se_alloc(sizeof(reload_frame_t));
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reload_frame->data_frame = 0;
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reload_frame->ack_frame = 0;
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reload_frame->req_time = pinfo->fd->abs_ts;
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se_tree_insert32_array(reload_framing_info->transaction_pdus, transaction_id_key, (void *)reload_frame);
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}
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transaction_id_key[2].key = key_save;
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transaction_id_key[2].length = len_save;
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/* check whether the message is a request or a response */
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if (type == DATA) {
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/* This is a data */
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if (reload_frame->data_frame == 0) {
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reload_frame->data_frame = pinfo->fd->num;
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}
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}
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else {
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/* This is a catch-all for all non-request messages */
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if (reload_frame->ack_frame == 0) {
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reload_frame->ack_frame = pinfo->fd->num;
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}
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}
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}
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else {
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reload_frame=se_tree_lookup32_array(reload_framing_info->transaction_pdus, transaction_id_key);
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transaction_id_key[2].key = key_save;
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transaction_id_key[2].length = len_save;
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}
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g_free(transaction_id_key[2].key);
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if (!reload_frame) {
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/* create a "fake" pana_trans structure */
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reload_frame = ep_alloc(sizeof(reload_frame_t));
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reload_frame->data_frame = (type==DATA) ? pinfo->fd->num : 0;
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reload_frame->ack_frame = (type!=DATA) ? pinfo->fd->num : 0;
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reload_frame->req_time = pinfo->fd->abs_ts;
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}
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ti = proto_tree_add_item(tree, proto_reload_framing, tvb, 0, -1, ENC_NA);
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reload_framing_tree = proto_item_add_subtree(ti, ett_reload_framing);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str_const(type, types, "Unknown"));
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proto_item_append_text(ti, ": %s", val_to_str_const(type, types, "Unknown"));
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/* Retransmission control */
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if (type == DATA) {
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if (reload_frame->data_frame != pinfo->fd->num) {
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proto_item *it;
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it = proto_tree_add_uint(reload_framing_tree, hf_reload_framing_duplicate, tvb, 0, 0, reload_frame->data_frame);
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PROTO_ITEM_SET_GENERATED(it);
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}
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if (reload_frame->ack_frame) {
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proto_item *it;
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it = proto_tree_add_uint(reload_framing_tree, hf_reload_framing_response_in, tvb, 0, 0, reload_frame->ack_frame);
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PROTO_ITEM_SET_GENERATED(it);
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}
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}
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else {
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/* This is a response */
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if (reload_frame->ack_frame != pinfo->fd->num) {
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proto_item *it;
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it = proto_tree_add_uint(reload_framing_tree, hf_reload_framing_duplicate, tvb, 0, 0, reload_frame->ack_frame);
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PROTO_ITEM_SET_GENERATED(it);
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}
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if (reload_frame->data_frame) {
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proto_item *it;
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nstime_t ns;
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it = proto_tree_add_uint(reload_framing_tree, hf_reload_framing_response_to, tvb, 0, 0, reload_frame->data_frame);
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PROTO_ITEM_SET_GENERATED(it);
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nstime_delta(&ns, &pinfo->fd->abs_ts, &reload_frame->req_time);
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it = proto_tree_add_time(reload_framing_tree, hf_reload_framing_time, tvb, 0, 0, &ns);
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PROTO_ITEM_SET_GENERATED(it);
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}
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}
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/*
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* Message dissection
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*/
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proto_tree_add_item(reload_framing_tree, hf_reload_framing_type, tvb, offset , 1, ENC_BIG_ENDIAN);
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offset += 1;
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switch (type) {
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case DATA:
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{
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tvbuff_t *next_tvb;
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proto_item *ti_message;
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proto_tree *message_tree;
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proto_tree_add_item(reload_framing_tree, hf_reload_framing_sequence, tvb, offset , 4, ENC_BIG_ENDIAN);
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offset += 4;
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ti_message = proto_tree_add_item(reload_framing_tree, hf_reload_framing_message, tvb, offset, 3+message_length, ENC_NA);
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proto_item_append_text(ti_message, " (opaque<%d>)", message_length);
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message_tree = proto_item_add_subtree(ti_message, ett_reload_framing_message);
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proto_tree_add_item(message_tree, hf_reload_framing_message_length, tvb, offset, 3, ENC_BIG_ENDIAN);
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offset += 3;
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proto_tree_add_item(message_tree, hf_reload_framing_message_data, tvb, offset, message_length, ENC_NA);
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next_tvb = tvb_new_subset(tvb, offset, effective_length - offset, message_length);
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if (reload_handle == NULL) {
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expert_add_info_format(pinfo, ti, PI_PROTOCOL, PI_WARN, "Can not find reload dissector");
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return tvb_length(tvb);
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}
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call_dissector_only(reload_handle, next_tvb, pinfo, tree, NULL);
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}
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break;
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case ACK:
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{
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proto_item *ti_received;
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proto_tree_add_uint(reload_framing_tree, hf_reload_framing_ack_sequence, tvb, offset , 4, sequence);
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offset += 4;
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ti_received = proto_tree_add_item(reload_framing_tree, hf_reload_framing_received, tvb, offset , 4, ENC_BIG_ENDIAN);
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{
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guint32 received;
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int last_received = -1;
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int indx = 0;
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proto_tree *received_tree;
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proto_item *ti_parsed_received = NULL;
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received = tvb_get_ntohl(tvb, offset);
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while ((received<<indx) != 0) {
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if (indx>=32) break;
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if (received &(0x1<<(31-indx))) {
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if (indx==0) {
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received_tree = proto_item_add_subtree(ti_received, ett_reload_framing_received);
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ti_parsed_received = proto_tree_add_item(received_tree, hf_reload_framing_parsed_received, tvb, offset, 4, ENC_NA);
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proto_item_append_text(ti_parsed_received, "[%u", (sequence -32+indx));
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last_received = indx;
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}
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else {
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if (received &(0x1<<(31-indx+1))) {
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indx++;
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/* range: skip */
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continue;
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}
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else {
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/* 1st acked in a serie */
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if (last_received<0) {
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/* 1st acked ever */
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received_tree = proto_item_add_subtree(ti_received, ett_reload_framing_received);
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ti_parsed_received = proto_tree_add_item(received_tree, hf_reload_framing_parsed_received, tvb, offset, 4, ENC_NA);
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proto_item_append_text(ti_parsed_received, "[%u",(sequence-32+indx));
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}
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else {
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proto_item_append_text(ti_parsed_received, ",%u",(sequence-32+indx));
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}
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last_received = indx;
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}
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}
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}
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else if (indx>0) {
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if ((received &(0x1<<(31-indx+1))) && (received &(0x1<<(31-indx+2)))) {
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/* end of a series */
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if ((received &(0x1<<(31-indx+3)))) {
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proto_item_append_text(ti_parsed_received,"-%u",(sequence-32+indx-1));
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}
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else {
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/* just a pair */
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proto_item_append_text(ti_received, ",%u", (sequence-32+indx-1));
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}
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}
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else {
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indx++;
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continue;
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}
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}
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indx++;
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}
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if (last_received>=0) {
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if ((received &(0x1<<(31-indx+1))) && (received &(0x1<<(31-indx+2)))) {
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/* end of a series */
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if ((received &(0x1<<(31-indx+3)))) {
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proto_item_append_text(ti_parsed_received,"-%u",(sequence-32+indx-1));
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}
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else {
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/* just a pair */
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proto_item_append_text(ti_parsed_received, ",%u", (sequence-32+indx-1));
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}
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}
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proto_item_append_text(ti_parsed_received, "]");
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PROTO_ITEM_SET_GENERATED(ti_parsed_received);
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}
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}
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}
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break;
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default:
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DISSECTOR_ASSERT_NOT_REACHED();
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}
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return tvb_length(tvb);
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}
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static int
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dissect_reload_framing_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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return dissect_reload_framing_message(tvb, pinfo, tree);
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}
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static void
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dissect_reload_framing_message_no_return(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_reload_framing_message(tvb, pinfo, tree);
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}
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static void
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dissect_reload_framing_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
/* XXX: Check if we have a valid RELOAD Frame Type ? */
|
|
tcp_dissect_pdus(tvb, pinfo, tree, TRUE, MIN_HDR_LENGTH,
|
|
get_reload_framing_message_length, dissect_reload_framing_message_no_return);
|
|
}
|
|
|
|
/* ToDo: If a TCP connection is identified heuristically as reload-framing, then
|
|
* the code should be such that reload-framing PDUs can be re-assembled (as is
|
|
* done for a TCP connection identified as reload-framing because of
|
|
* the TCP port used).
|
|
*/
|
|
static gboolean
|
|
dissect_reload_framing_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
if (dissect_reload_framing_message(tvb, pinfo, tree) == 0) {
|
|
/*
|
|
* It wasn't a valid RELOAD message, and wasn't
|
|
* dissected as such.
|
|
*/
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
proto_register_reload_framing(void)
|
|
{
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_reload_framing_type,
|
|
{ "type (FramedMessageType)", "reload_framing.type", FT_UINT8,
|
|
BASE_DEC, VALS(types), 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_sequence,
|
|
{ "sequence (uint32)", "reload_framing.sequence", FT_UINT32,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_ack_sequence,
|
|
{ "ack_sequence (uint32)", "reload_framing.ack_sequence", FT_UINT32,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_message,
|
|
{ "message", "reload_framing.message", FT_NONE,
|
|
BASE_NONE, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_message_length,
|
|
{ "length (uint24)", "reload_framing.message.length", FT_UINT32,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_message_data,
|
|
{ "data", "reload_framing.message.data", FT_BYTES,
|
|
BASE_NONE, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_received,
|
|
{ "received (uint32)", "reload_framing.received", FT_UINT32,
|
|
BASE_HEX, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_parsed_received,
|
|
{ "Acked Frames:", "reload_framing.parsed_received", FT_NONE,
|
|
BASE_NONE, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_response_in,
|
|
{ "Response In", "reload_framing.response-in", FT_FRAMENUM,
|
|
BASE_NONE, NULL, 0x0, "The response to this RELOAD Request is in this frame", HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_response_to,
|
|
{ "Request In", "reload_framing.response-to", FT_FRAMENUM,
|
|
BASE_NONE, NULL, 0x0, "This is a response to the RELOAD Request in this frame", HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_time,
|
|
{ "Time", "reload_framing.time", FT_RELATIVE_TIME,
|
|
BASE_NONE, NULL, 0x0, "The time between the Request and the Response", HFILL
|
|
}
|
|
},
|
|
{ &hf_reload_framing_duplicate,
|
|
{ "Duplicated original message in", "reload_framing.duplicate", FT_FRAMENUM,
|
|
BASE_NONE, NULL, 0x0, "This is a duplicate of RELOAD message in this frame", HFILL
|
|
}
|
|
},
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_reload_framing,
|
|
&ett_reload_framing_message,
|
|
&ett_reload_framing_received,
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_reload_framing = proto_register_protocol("REsource LOcation And Discovery Framing", "RELOAD FRAMING", "reload-framing");
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_reload_framing, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_dissector("reload-framing", dissect_reload_framing_message_no_return, proto_reload_framing);
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_reload_framing(void)
|
|
{
|
|
|
|
dissector_handle_t reload_framing_tcp_handle;
|
|
dissector_handle_t reload_framing_udp_handle;
|
|
|
|
reload_framing_tcp_handle = create_dissector_handle(dissect_reload_framing_tcp, proto_reload_framing);
|
|
reload_framing_udp_handle = new_create_dissector_handle(dissect_reload_framing_udp, proto_reload_framing);
|
|
|
|
reload_handle = find_dissector("reload");
|
|
|
|
dissector_add_uint("tcp.port", TCP_PORT_RELOAD, reload_framing_tcp_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_RELOAD, reload_framing_udp_handle);
|
|
|
|
heur_dissector_add("udp", dissect_reload_framing_heur, proto_reload_framing);
|
|
heur_dissector_add("tcp", dissect_reload_framing_heur, proto_reload_framing);
|
|
heur_dissector_add("dtls", dissect_reload_framing_heur, proto_reload_framing);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|