/* Find the current conversation or make a new one if required */
static ts2_conversation* ts2_get_conversation(packet_info *pinfo)
{
    conversation_t *conversation;
    ts2_conversation *conversation_data;
    conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
    if(conversation)
    {

        conversation_data = (ts2_conversation*)conversation_get_proto_data(conversation, proto_ts2);
    }
    else
    {
        conversation_data = g_mem_chunk_alloc(conv_vals);
        conversation_data->last_inorder_server_frame=0; /* sequence number should never be zero so we can use this as an initial number */
        conversation_data->last_inorder_client_frame=0;
        conversation_data->server_port=pinfo->srcport;
        conversation_data->server_frag_size=0;
        conversation_data->server_frag_num=0;
        conversation_data->client_frag_size=0;
        conversation_data->client_frag_num=0;
        conversation = conversation_new(pinfo->fd->num,  &pinfo->src, &pinfo->dst, pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
        conversation_add_proto_data(conversation, proto_ts2, (void *)conversation_data);
    }
    return conversation_data;
}

static gwtb_entry_t* dissect_gwtb_get_data(packet_info* pinfo)
{
	conversation_t *conversation;
	gwtb_entry_t *data_ptr;

	/*
	 * Do we have a conversation for this connection?
	 */
	conversation = find_or_create_conversation(pinfo);

	/*
	 * Do we already have a state structure for this conv
	 */
	data_ptr = (gwtb_entry_t*)conversation_get_proto_data(conversation, proto_gwtb);
	if (!data_ptr) {
		/*
         * No.  Attach that information to the conversation, and add
		 * it to the list of information structures.
		 */
		data_ptr = (gwtb_entry_t*)se_alloc(sizeof(gwtb_entry_t));
		data_ptr->greeting = NULL;
		data_ptr->request_key[0] = NULL;
		data_ptr->request_key[1] = NULL;
		data_ptr->response_key[0] = NULL;
		data_ptr->response_key[1] = NULL;
		data_ptr->request_rc4 = NULL;
		data_ptr->response_rc4 = NULL;

		conversation_add_proto_data(conversation, proto_gwtb, data_ptr);
	}

	return data_ptr;
}

static ipmi_packet_data_t *
get_packet_data(packet_info * pinfo)
{
	ipmi_packet_data_t * data;

	/* get conversation data */
	conversation_t * conv = find_or_create_conversation(pinfo);

	/* get protocol-specific data */
	data = (ipmi_packet_data_t *)
			conversation_get_proto_data(conv, proto_ipmi);

	if (!data) {
		/* allocate per-packet data */
		data = wmem_new0(wmem_file_scope(), ipmi_packet_data_t);

		/* allocate request list and frame tree */
		data->frame_tree = wmem_tree_new(wmem_file_scope());
		data->request_list = wmem_list_new(wmem_file_scope());

		/* add protocol data */
		conversation_add_proto_data(conv, proto_ipmi, data);
	}

	/* check if packet has changed */
	if (pinfo->num != data->curr_frame_num) {
		data->curr_level = 0;
		data->next_level = 0;
	}

	return data;
}

static lbmtcp_transport_t * lbmtcp_transport_add(const address * address1, guint16 port1, const address * address2, guint16 port2, guint32 frame)
{
    lbmtcp_transport_t * entry;
    conversation_t * conv = NULL;

    conv = find_conversation(frame, address1, address2, PT_TCP, port1, port2, 0);
    if (conv == NULL)
    {
        conv = conversation_new(frame, address1, address2, PT_TCP, port1, port2, 0);
    }
    entry = (lbmtcp_transport_t *) conversation_get_proto_data(conv, lbmpdm_tcp_protocol_handle);
    if (entry != NULL)
    {
        return (entry);
    }
    entry = wmem_new(wmem_file_scope(), lbmtcp_transport_t);
    copy_address_wmem(wmem_file_scope(), &(entry->addr1), address1);
    entry->port1 = port1;
    copy_address_wmem(wmem_file_scope(), &(entry->addr2), address2);
    entry->port2 = port2;
    lbmtcp_order_key(entry);
    entry->channel = lbm_channel_assign(LBM_CHANNEL_TCP);
    conversation_add_proto_data(conv, lbmpdm_tcp_protocol_handle, (void *) entry);
    return (entry);
}

/* Set up an MSRP conversation using the info given */
void msrp_add_address( packet_info *pinfo,
                       address *addr, int port,
                       const gchar *setup_method, guint32 setup_frame_number)
{
	address null_addr;
	conversation_t* p_conv;
	struct _msrp_conversation_info *p_conv_data = NULL;

	/*
	 * If this isn't the first time this packet has been processed,
	 * we've already done this work, so we don't need to do it
	 * again.
	 */
	if (pinfo->fd->flags.visited)
	{
		return;
	}

	SET_ADDRESS(&null_addr, AT_NONE, 0, NULL);

	/*
	 * Check if the ip address and port combination is not
	 * already registered as a conversation.
	 */
	p_conv = find_conversation( pinfo->fd->num, addr, &null_addr, PT_TCP, port, 0,
	                            NO_ADDR_B | NO_PORT_B);

	/*
	 * If not, create a new conversation.
	 */
	if (!p_conv) {
		p_conv = conversation_new( pinfo->fd->num, addr, &null_addr, PT_TCP,
		                           (guint32)port, 0,
		                           NO_ADDR2 | NO_PORT2);
	}

	/* Set dissector */
	conversation_set_dissector(p_conv, msrp_handle);

	/*
	 * Check if the conversation has data associated with it.
	 */
	p_conv_data = conversation_get_proto_data(p_conv, proto_msrp);

	/*
	 * If not, add a new data item.
	 */
	if (!p_conv_data) {
		/* Create conversation data */
		p_conv_data = se_alloc0(sizeof(struct _msrp_conversation_info));
		conversation_add_proto_data(p_conv, proto_msrp, p_conv_data);
	}

	/*
	 * Update the conversation data.
	 */
	p_conv_data->setup_method_set = TRUE;
	g_strlcpy(p_conv_data->setup_method, setup_method, MAX_MSRP_SETUP_METHOD_SIZE);
	p_conv_data->setup_frame_number = setup_frame_number;
}

/* Packet dissection routine called by tcp (& udp) when port 873 detected */
static int
dissect_rsync_encap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
                    gboolean desegment _U_)
{
    conversation_t                 *conversation;
    struct rsync_conversation_data *conversation_data;
    struct rsync_frame_data        *rsync_frame_data_p;
    proto_item                     *ti;
    proto_tree                     *rsync_tree;
    enum rsync_who                  me;
    int                             offset = 0;
    guint                           buff_length;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "RSYNC");

    col_clear(pinfo->cinfo, COL_INFO);

    me = pinfo->srcport == glb_rsync_tcp_port ? SERVER : CLIENT;

    conversation = find_or_create_conversation(pinfo);

    conversation_data = (struct rsync_conversation_data *)conversation_get_proto_data(conversation, hfi_rsync->id);

    if (conversation_data == NULL) { /* new conversation */
    conversation_data = wmem_new(wmem_file_scope(), struct rsync_conversation_data);
    conversation_data->client_state = RSYNC_INIT;
    conversation_data->server_state = RSYNC_SERV_INIT;
    conversation_add_proto_data(conversation, hfi_rsync->id, conversation_data);
    }

lbttcp_transport_t * lbttcp_transport_add(const address * source_address, guint16 source_port, guint32 session_id, guint32 frame)
{
    lbttcp_transport_t * entry = NULL;
    conversation_t * conv = NULL;
    lbttcp_transport_conv_data_t * conv_data = NULL;

    conv = find_conversation(frame, source_address, &lbttcp_null_address, PT_TCP, source_port, 0, 0);
    if (conv == NULL)
    {
        conv = conversation_new(frame, source_address, &lbttcp_null_address, PT_TCP, source_port, 0, 0);
    }
    conv_data = (lbttcp_transport_conv_data_t *) conversation_get_proto_data(conv, proto_lbttcp);
    if (conv_data == NULL)
    {
        conv_data = wmem_new(wmem_file_scope(), lbttcp_transport_conv_data_t);
        conv_data->frame_tree = wmem_tree_new(wmem_file_scope());
        conv_data->session_tree = wmem_tree_new(wmem_file_scope());
        conversation_add_proto_data(conv, proto_lbttcp, (void *) conv_data);
    }
    entry = (lbttcp_transport_t *) wmem_tree_lookup32(conv_data->session_tree, session_id);
    if (entry != NULL)
    {
        return (entry);
    }
    entry = lbttcp_transport_create(source_address, source_port, session_id);
    wmem_tree_insert32(conv_data->session_tree, session_id, (void *) entry);
    wmem_tree_insert32(conv_data->frame_tree, frame, (void *) entry);
    return (entry);
}

void lbttcp_transport_sid_add(const address * source_address, guint16 source_port, guint32 frame, guint32 session_id)
{
    conversation_t * conv = NULL;
    lbttcp_transport_conv_data_t * conv_data = NULL;
    lbttcp_transport_t * transport = NULL;

    conv = find_conversation(frame, source_address, &lbttcp_null_address, PT_TCP, source_port, 0, 0);
    if (conv == NULL)
    {
        conv = conversation_new(frame, source_address, &lbttcp_null_address, PT_TCP, source_port, 0, 0);
    }
    conv_data = (lbttcp_transport_conv_data_t *) conversation_get_proto_data(conv, proto_lbttcp);
    if (conv_data == NULL)
    {
        conv_data = wmem_new(wmem_file_scope(), lbttcp_transport_conv_data_t);
        conv_data->frame_tree = wmem_tree_new(wmem_file_scope());
        conv_data->session_tree = wmem_tree_new(wmem_file_scope());
        conversation_add_proto_data(conv, proto_lbttcp, (void *) conv_data);
    }
    /* Lookup by frame */
    transport = (lbttcp_transport_t *) wmem_tree_lookup32_le(conv_data->frame_tree, frame);
    if (transport != NULL)
    {
        if (transport->session_id != session_id)
        {
            transport = NULL;
        }
    }
    if (transport == NULL)
    {
        transport = lbttcp_transport_create(source_address, source_port, session_id);
        wmem_tree_insert32(conv_data->session_tree, session_id, (void *) transport);
        wmem_tree_insert32(conv_data->frame_tree, frame, (void *) transport);
    }
}

static void
new_udp_conversation( socks_hash_entry_t *hash_info, packet_info *pinfo){

    conversation_t *conversation = conversation_new( pinfo->fd->num, &pinfo->src, &pinfo->dst,  PT_UDP,
            hash_info->udp_port, hash_info->port, 0);

    DISSECTOR_ASSERT( conversation);

    conversation_add_proto_data(conversation, proto_socks, hash_info);
    conversation_set_dissector(conversation, socks_udp_handle);
}

/* Set up an MSRP conversation using the info given */
void
msrp_add_address( packet_info *pinfo,
                       address *addr, int port,
                       const gchar *setup_method, guint32 setup_frame_number)
{
    address null_addr;
    conversation_t* p_conv;
    struct _msrp_conversation_info *p_conv_data = NULL;

    /*
     * If this isn't the first time this packet has been processed,
     * we've already done this work, so we don't need to do it
     * again.
     */
    if (pinfo->fd->flags.visited)
    {
        return;
    }

    clear_address(&null_addr);

    /*
     * Check if the ip address and port combination is not
     * already registered as a conversation.
     */
    p_conv = find_conversation( pinfo->num, addr, &null_addr, ENDPOINT_TCP, port, 0,
                                NO_ADDR_B | NO_PORT_B);

    /*
     * If not, create a new conversation.
     */
    if (!p_conv) {
        p_conv = conversation_new( pinfo->num, addr, &null_addr, ENDPOINT_TCP,
                                   (guint32)port, 0,
                                   NO_ADDR2 | NO_PORT2);
    }

    /* Set dissector */
    conversation_set_dissector(p_conv, msrp_handle);

    /*
     * Check if the conversation has data associated with it.
     */
    p_conv_data = (struct _msrp_conversation_info *)conversation_get_proto_data(p_conv, proto_msrp);

    /*
     * If not, add a new data item.
     */
    if (!p_conv_data) {
        /* Create conversation data */
        p_conv_data = wmem_new0(wmem_file_scope(), struct _msrp_conversation_info);
        conversation_add_proto_data(p_conv, proto_msrp, p_conv_data);
    }

static lbttcp_client_transport_t * lbttcp_client_transport_add(lbttcp_transport_t * transport, const address * receiver_address, guint16 receiver_port, guint32 frame)
{
    lbttcp_client_transport_t * entry;
    conversation_t * client_conv = NULL;
    wmem_tree_t * session_tree = NULL;

    if (transport == NULL)
    {
        return (NULL);
    }
    entry = lbttcp_client_transport_find(transport, receiver_address, receiver_port, frame);
    if (entry != NULL)
    {
        return (entry);
    }
    entry = wmem_new(wmem_file_scope(), lbttcp_client_transport_t);
    copy_address_wmem(wmem_file_scope(), &(entry->receiver_address), receiver_address);
    entry->receiver_port = receiver_port;
    entry->id = transport->next_client_id++;

    /* See if a conversation for this address/port pair exists. */
    client_conv = find_conversation(frame, &(transport->source_address), receiver_address, PT_TCP, transport->source_port, receiver_port, 0);
    if (client_conv == NULL)
    {
        client_conv = conversation_new(frame, &(transport->source_address), receiver_address, PT_TCP, transport->source_port, receiver_port, 0);
        session_tree = wmem_tree_new(wmem_file_scope());
        conversation_add_proto_data(client_conv, proto_lbttcp, (void *) session_tree);
    }
    session_tree = (wmem_tree_t *) conversation_get_proto_data(client_conv, proto_lbttcp);
    if (session_tree == NULL)
    {
        session_tree = wmem_tree_new(wmem_file_scope());
        conversation_add_proto_data(client_conv, proto_lbttcp, (void *) session_tree);
    }
    wmem_tree_insert32(session_tree, transport->session_id, (void *) entry);

    /* Add this client to the transport. */
    wmem_list_append(transport->client_list, (void *) entry);
    return (entry);
}

static void mark_pmproxy_exchange_complete(packet_info *pinfo) {
    conversation_t *conversation;
    pmproxy_conversation_info_t *pmproxy_conversation;

    conversation = find_or_create_conversation(pinfo);
    pmproxy_conversation = (pmproxy_conversation_info_t *)conversation_get_proto_data(conversation, proto_pmproxy);

    if(pmproxy_conversation == NULL) {
        pmproxy_conversation = wmem_new(wmem_file_scope(), pmproxy_conversation_info_t);
    }
    pmproxy_conversation->last_proxy_frame = pinfo->num;
    conversation_add_proto_data(conversation, proto_pmproxy, pmproxy_conversation);
}

/* returns TRUE if this TCP segment carries a MPA REQUEST and FLASE otherwise */
static gboolean
is_mpa_req(tvbuff_t *tvb, packet_info *pinfo)
{
	conversation_t *conversation = NULL;
	mpa_state_t *state = NULL;
	guint8 mcrres;

	if (tvb_get_ntoh64(tvb, 0) != MPA_REQ_REP_FRAME
			|| tvb_get_ntoh64(tvb, 8) != MPA_ID_REQ_FRAME)
		return FALSE;

	conversation = find_conversation(pinfo->fd->num, &pinfo->src,
			&pinfo->dst, pinfo->ptype, pinfo->srcport,
			pinfo->destport, 0);

	if (!conversation) {
		conversation = conversation_new(pinfo->fd->num, &pinfo->src,
				&pinfo->dst, pinfo->ptype, pinfo->srcport,
				pinfo->destport, 0);
	}

	if (!get_mpa_state(conversation)) {

		/* associate a MPA connection state to this conversation if
		 * there is no MPA state already associated to this connection
		 */
		state = init_mpa_state();

		/* anaylize MPA connection parameter and record them */
		mcrres = tvb_get_guint8(tvb, 16);
		state->ini_exp_m_res = mcrres & MPA_MARKER_FLAG;
		state->crc = mcrres & MPA_CRC_FLAG;
		state->revision = tvb_get_guint8(tvb, 17);
		state->req_frame_num = pinfo->fd->num;
		state->minfo[MPA_INITIATOR].port = pinfo->srcport;
		state->minfo[MPA_RESPONDER].port = pinfo->destport;

		conversation_add_proto_data(conversation, proto_iwarp_mpa, state);

		/* update expert info */
		if (mcrres & MPA_RESERVED_FLAG)
			expert_add_info_format(pinfo, NULL, PI_REQUEST_CODE, PI_WARN,
					"Res field is NOT set to zero as required by RFC 5044");

		if (state->revision != 1)
			expert_add_info_format(pinfo, NULL, PI_REQUEST_CODE, PI_WARN,
					"Rev field is NOT set to one as required by RFC 5044");
	}
	return TRUE;
}

/* When seeing a broadcast talking about an open TCP port on a host, create
 * a conversation to dissect anything sent/received at that address.  Setup
 * protocol data so the TCP dissection knows what broadcast triggered it. */
static void
prepare_ldss_transfer_conv(ldss_broadcast_t *broadcast)
{
	conversation_t *transfer_conv;
	ldss_transfer_info_t *transfer_info;

	transfer_info = wmem_new0(wmem_file_scope(), ldss_transfer_info_t);
	transfer_info->broadcast = broadcast;

	/* Preparation for later push/pull dissection */
	transfer_conv = conversation_new (broadcast->num, &broadcast->broadcaster->addr, &broadcast->broadcaster->addr,
					  PT_TCP, broadcast->broadcaster->port, broadcast->broadcaster->port, NO_ADDR2|NO_PORT2);
	conversation_add_proto_data(transfer_conv, proto_ldss, transfer_info);
	conversation_set_dissector(transfer_conv, ldss_tcp_handle);
}

static usbip_conv_info_t *
usbip_get_usbip_conv(packet_info *pinfo)
{
    conversation_t *conversation;
    usbip_conv_info_t *usbip_info;

    conversation = find_or_create_conversation(pinfo);
    usbip_info = (usbip_conv_info_t *) conversation_get_proto_data(conversation,
                 proto_usbip);
    if (!usbip_info) {
        usbip_info = wmem_new(wmem_file_scope(), usbip_conv_info_t);
        usbip_info->pdus = wmem_tree_new(wmem_file_scope());
        conversation_add_proto_data(conversation, proto_usbip, usbip_info);
    }
    return usbip_info;
}

static void add_msproxy_conversation( packet_info *pinfo,
	hash_entry_t *hash_info){

/* check to see if a conversation already exists, if it does assume 	*/
/* it's our conversation and quit. Otherwise create a new conversation.	*/
/* Load the conversation dissector to our  dissector and load the	*/
/* conversation data structure with the info needed to call the TCP or 	*/
/* UDP port decoder.							*/

/* NOTE: Currently this assume that the conversation will be created 	*/
/* 	during a packet from the server.  If that changes, pinfo->src	*/
/*	and pinfo->dst will not be correct and this routine will have	*/
/*	to change.							*/

	conversation_t *conversation;
	redirect_entry_t *new_conv_info;

	if (pinfo->fd->flags.visited) {
		/*
		 * We've already processed this frame once, so we
		 * should already have done this.
		 */
		return;
	}

	conversation = find_conversation( pinfo->fd->num, &pinfo->src,
		&pinfo->dst, (port_type)hash_info->proto, hash_info->server_int_port,
		hash_info->clnt_port, 0);

	if ( !conversation) {
		conversation = conversation_new( pinfo->fd->num, &pinfo->src, &pinfo->dst,
			(port_type)hash_info->proto, hash_info->server_int_port,
			hash_info->clnt_port, 0);
	}
	conversation_set_dissector(conversation, msproxy_sub_handle);

	new_conv_info = se_new(redirect_entry_t);

	new_conv_info->remote_addr = hash_info->dst_addr;
	new_conv_info->clnt_port = hash_info->clnt_port;
	new_conv_info->remote_port = hash_info->dst_port;
	new_conv_info->server_int_port = hash_info->server_int_port;
	new_conv_info->proto = hash_info->proto;

	conversation_add_proto_data(conversation, proto_msproxy,
		new_conv_info);
}

static usb_i1d3_conversation_t *usb_i1d3_get_conversation(packet_info *pinfo) {
    conversation_t *conversation = find_or_create_conversation(pinfo);
    usb_i1d3_conversation_t* i1d3_conversation =
        (usb_i1d3_conversation_t *)conversation_get_proto_data(
                conversation, proto_usb_i1d3);
    if (!i1d3_conversation) {
        i1d3_conversation = wmem_new0(
                wmem_file_scope(), usb_i1d3_conversation_t);
        i1d3_conversation->request_to_transaction = wmem_map_new(
                wmem_file_scope(), g_direct_hash, g_direct_equal);
        i1d3_conversation->response_to_transaction = wmem_map_new(
                wmem_file_scope(), g_direct_hash, g_direct_equal);
        conversation_add_proto_data(
                conversation, proto_usb_i1d3, i1d3_conversation);
    }
    return i1d3_conversation;
}

struct udp_analysis *
get_udp_conversation_data(conversation_t *conv, packet_info *pinfo)
{
  int direction;
  struct udp_analysis *udpd=NULL;

  /* Did the caller supply the conversation pointer? */
  if (conv == NULL)
    conv = find_or_create_conversation(pinfo);

  /* Get the data for this conversation */
  udpd=(struct udp_analysis *)conversation_get_proto_data(conv, hfi_udp->id);

  /* If the conversation was just created or it matched a
   * conversation with template options, udpd will not
   * have been initialized. So, initialize
   * a new udpd structure for the conversation.
   */
  if (!udpd) {
    udpd = init_udp_conversation_data();
    conversation_add_proto_data(conv, hfi_udp->id, udpd);
  }

  if (!udpd) {
    return NULL;
  }

  /* check direction and get ua lists */
  direction=CMP_ADDRESS(&pinfo->src, &pinfo->dst);
  /* if the addresses are equal, match the ports instead */
  if (direction == 0) {
    direction= (pinfo->srcport > pinfo->destport) ? 1 : -1;
  }
  if (direction >= 0) {
    udpd->fwd=&(udpd->flow1);
    udpd->rev=&(udpd->flow2);
  } else {
    udpd->fwd=&(udpd->flow2);
    udpd->rev=&(udpd->flow1);
  }

  return udpd;
}

/* returns TRUE if this TCP segment carries a MPA REQUEST and FLASE otherwise */
static gboolean
is_mpa_req(tvbuff_t *tvb, packet_info *pinfo)
{
	conversation_t *conversation = NULL;
	mpa_state_t *state = NULL;
	guint8 mcrres;

	if (tvb_get_ntoh64(tvb, 0) != MPA_REQ_REP_FRAME
			|| tvb_get_ntoh64(tvb, 8) != MPA_ID_REQ_FRAME)
		return FALSE;

	conversation = find_or_create_conversation(pinfo);

	if (!get_mpa_state(conversation)) {

		/* associate a MPA connection state to this conversation if
		 * there is no MPA state already associated to this connection
		 */
		state = init_mpa_state();

		/* anaylize MPA connection parameter and record them */
		mcrres = tvb_get_guint8(tvb, 16);
		state->ini_exp_m_res = mcrres & MPA_MARKER_FLAG;
		state->crc = mcrres & MPA_CRC_FLAG;
		state->revision = tvb_get_guint8(tvb, 17);
		state->req_frame_num = pinfo->fd->num;
		state->minfo[MPA_INITIATOR].port = pinfo->srcport;
		state->minfo[MPA_RESPONDER].port = pinfo->destport;

		conversation_add_proto_data(conversation, proto_iwarp_mpa, state);

		/* update expert info */
		if (mcrres & MPA_RESERVED_FLAG)
			expert_add_info(pinfo, NULL, &ei_mpa_res_field_not_set0);

		if (state->revision != 1)
			expert_add_info(pinfo, NULL, &ei_mpa_rev_field_not_set1);
	}
	return TRUE;
}

/* initialize the tap t38_info and the conversation */
static void
init_t38_info_conv(packet_info *pinfo)
{
	/* tap info */
	t38_info_current++;
	if (t38_info_current==MAX_T38_MESSAGES_IN_PACKET) {
		t38_info_current=0;
	}
	t38_info = &t38_info_arr[t38_info_current];

	t38_info->seq_num = 0;
	t38_info->type_msg = 0;
	t38_info->data_value = 0;
	t38_info->t30ind_value =0;
	t38_info->setup_frame_number = 0;
	t38_info->Data_Field_field_type_value = 0;
	t38_info->desc[0] = '\0';
	t38_info->desc_comment[0] = '\0';
	t38_info->time_first_t4_data = 0;
	t38_info->frame_num_first_t4_data = 0;


	/*
		p_t38_packet_conv hold the conversation info in each of the packets.
		p_t38_conv hold the conversation info used to reassemble the HDLC packets, and also the Setup info (e.g SDP)
		If we already have p_t38_packet_conv in the packet, it means we already reassembled the HDLC packets, so we don't
		need to use p_t38_conv
	*/
	p_t38_packet_conv = NULL;
	p_t38_conv = NULL;

	/* Use existing packet info if available */
	 p_t38_packet_conv = (t38_conv *)p_get_proto_data(wmem_file_scope(), pinfo, proto_t38, 0);


	/* find the conversation used for Reassemble and Setup Info */
	p_conv = find_conversation(pinfo->fd->num, &pinfo->net_dst, &pinfo->net_src,
                                   pinfo->ptype,
                                   pinfo->destport, pinfo->srcport, NO_ADDR_B | NO_PORT_B);

	/* create a conv if it doen't exist */
	if (!p_conv) {
		p_conv = conversation_new(pinfo->fd->num, &pinfo->net_src, &pinfo->net_dst,
			      pinfo->ptype, pinfo->srcport, pinfo->destport, NO_ADDR_B | NO_PORT_B);

		/* Set dissector */
		conversation_set_dissector(p_conv, t38_udp_handle);
	}

	if (!p_t38_packet_conv) {
		p_t38_conv = (t38_conv *)conversation_get_proto_data(p_conv, proto_t38);

		/* create the conversation if it doen't exist */
		if (!p_t38_conv) {
			p_t38_conv = wmem_new(wmem_file_scope(), t38_conv);
			p_t38_conv->setup_method[0] = '\0';
			p_t38_conv->setup_frame_number = 0;

			p_t38_conv->src_t38_info.reass_ID = 0;
			p_t38_conv->src_t38_info.reass_start_seqnum = -1;
			p_t38_conv->src_t38_info.reass_data_type = 0;
			p_t38_conv->src_t38_info.last_seqnum = -1;
			p_t38_conv->src_t38_info.packet_lost = 0;
			p_t38_conv->src_t38_info.burst_lost = 0;
			p_t38_conv->src_t38_info.time_first_t4_data = 0;
			p_t38_conv->src_t38_info.additional_hdlc_data_field_counter = 0;
			p_t38_conv->src_t38_info.seqnum_prev_data_field = -1;

			p_t38_conv->dst_t38_info.reass_ID = 0;
			p_t38_conv->dst_t38_info.reass_start_seqnum = -1;
			p_t38_conv->dst_t38_info.reass_data_type = 0;
			p_t38_conv->dst_t38_info.last_seqnum = -1;
			p_t38_conv->dst_t38_info.packet_lost = 0;
			p_t38_conv->dst_t38_info.burst_lost = 0;
			p_t38_conv->dst_t38_info.time_first_t4_data = 0;
			p_t38_conv->dst_t38_info.additional_hdlc_data_field_counter = 0;
			p_t38_conv->dst_t38_info.seqnum_prev_data_field = -1;

			conversation_add_proto_data(p_conv, proto_t38, p_t38_conv);
		}

		/* copy the t38 conversation info to the packet t38 conversation */
		p_t38_packet_conv = wmem_new(wmem_file_scope(), t38_conv);
		g_strlcpy(p_t38_packet_conv->setup_method, p_t38_conv->setup_method, MAX_T38_SETUP_METHOD_SIZE);
		p_t38_packet_conv->setup_frame_number = p_t38_conv->setup_frame_number;

		memcpy(&(p_t38_packet_conv->src_t38_info), &(p_t38_conv->src_t38_info), sizeof(t38_conv_info));
		memcpy(&(p_t38_packet_conv->dst_t38_info), &(p_t38_conv->dst_t38_info), sizeof(t38_conv_info));

		p_add_proto_data(wmem_file_scope(), pinfo, proto_t38, 0, p_t38_packet_conv);
	}

	if (ADDRESSES_EQUAL(&p_conv->key_ptr->addr1, &pinfo->net_src)) {
		p_t38_conv_info = &(p_t38_conv->src_t38_info);
		p_t38_packet_conv_info = &(p_t38_packet_conv->src_t38_info);
	} else {
		p_t38_conv_info = &(p_t38_conv->dst_t38_info);
		p_t38_packet_conv_info = &(p_t38_packet_conv->dst_t38_info);
	}
//.........这里部分代码省略.........