forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
606 lines
20 KiB
C
606 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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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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* - RFC 6940 (does this incorporate all changes between
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* draft-ietf-p2psip-base-15 and RFC 6940, if any?)
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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/expert.h>
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#include <epan/tap.h>
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#include <epan/exported_pdu.h>
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#include "packet-tcp.h"
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void proto_register_reload_framing(void);
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void proto_reg_handoff_reload_framing(void);
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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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static gint exported_pdu_tap = -1;
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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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wmem_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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static expert_field ei_reload_no_dissector = EI_INIT;
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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,
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int offset, void *data _U_)
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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, gboolean from_dtls)
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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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wmem_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_captured_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(pinfo, 0);
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if (conversation)
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reload_framing_info = (reload_conv_info_t *)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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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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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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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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if (from_dtls && have_tap_listener(exported_pdu_tap)) {
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exp_pdu_data_t *exp_pdu_data = export_pdu_create_common_tags(pinfo, "reload-framing", EXP_PDU_TAG_PROTO_NAME);
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exp_pdu_data->tvb_captured_length = effective_length;
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exp_pdu_data->tvb_reported_length = tvb_reported_length(tvb);
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exp_pdu_data->pdu_tvb = tvb;
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tap_queue_packet(exported_pdu_tap, pinfo, exp_pdu_data);
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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 wmem_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 = (guint32 *)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 = (guint32 *)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->num, &pinfo->src, &pinfo->dst,
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conversation_pt_to_endpoint_type(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 = wmem_new(wmem_file_scope(), reload_conv_info_t);
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reload_framing_info->transaction_pdus = wmem_tree_new(wmem_file_scope());
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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 = (reload_frame_t *)
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wmem_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 = wmem_new(wmem_file_scope(), 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->abs_ts;
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wmem_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->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->num;
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}
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}
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}
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else {
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reload_frame=(reload_frame_t *)wmem_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 = wmem_new(wmem_packet_scope(), reload_frame_t);
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reload_frame->data_frame = (type==DATA) ? pinfo->num : 0;
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reload_frame->ack_frame = (type!=DATA) ? pinfo->num : 0;
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reload_frame->req_time = pinfo->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->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->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->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_length_caplen(tvb, offset, effective_length - offset, message_length);
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if (reload_handle == NULL) {
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expert_add_info(pinfo, ti, &ei_reload_no_dissector);
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return tvb_captured_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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unsigned 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 ((indx<32) && (received<<indx) != 0) {
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if (received &(1U<<(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 &(1U<<(31-indx+1))) {
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indx++;
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/* the previous one is also acked: in the middle of a range: skip */
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continue;
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}
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else {
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/* 1st acked in a series */
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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 ((indx>1) && (received &(1U<<(31-indx+1))) && (received &(1U<<(31-indx+2)))) {
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/* end of a series */
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if ((indx>2) && (received &(1U<<(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 ((indx>1) && (received &(1U<<(31-indx+1))) && (received &(1U<<(31-indx+2)))) {
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/* end of a series */
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if ((indx>2) && (received &(1U<<(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_captured_length(tvb);
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}
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static int
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dissect_reload_framing(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, FALSE);
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}
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static int
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dissect_reload_framing_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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/* XXX: Check if we have a valid RELOAD Frame Type ? */
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tcp_dissect_pdus(tvb, pinfo, tree, TRUE, MIN_HDR_LENGTH,
|
|
get_reload_framing_message_length, dissect_reload_framing, data);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
/* 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, FALSE) == 0) {
|
|
/*
|
|
* It wasn't a valid RELOAD message, and wasn't
|
|
* dissected as such.
|
|
*/
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
dissect_reload_framing_heur_dtls(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
if (dissect_reload_framing_message(tvb, pinfo, tree, TRUE) == 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,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_reload_no_dissector, { "reload_framing.no_dissector", PI_PROTOCOL, PI_WARN, "Can not find reload dissector", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_reload_framing;
|
|
|
|
/* 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));
|
|
expert_reload_framing = expert_register_protocol(proto_reload_framing);
|
|
expert_register_field_array(expert_reload_framing, ei, array_length(ei));
|
|
|
|
register_dissector("reload-framing", dissect_reload_framing, 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 = create_dissector_handle(dissect_reload_framing, proto_reload_framing);
|
|
|
|
reload_handle = find_dissector_add_dependency("reload", proto_reload_framing);
|
|
|
|
dissector_add_uint_with_preference("tcp.port", TCP_PORT_RELOAD, reload_framing_tcp_handle);
|
|
dissector_add_uint_with_preference("udp.port", UDP_PORT_RELOAD, reload_framing_udp_handle);
|
|
|
|
heur_dissector_add("udp", dissect_reload_framing_heur, "RELOAD Framing over UDP", "reload_framing_udp", proto_reload_framing, HEURISTIC_ENABLE);
|
|
heur_dissector_add("tcp", dissect_reload_framing_heur, "RELOAD Framing over TCP", "reload_framing_tcp", proto_reload_framing, HEURISTIC_ENABLE);
|
|
heur_dissector_add("dtls", dissect_reload_framing_heur_dtls, "RELOAD Framing over DTLS", "reload_framing_dtls", proto_reload_framing, HEURISTIC_ENABLE);
|
|
|
|
exported_pdu_tap = find_tap_id(EXPORT_PDU_TAP_NAME_LAYER_7);
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
*/
|