C++ call_dissector函数代码示例

//.........这里部分代码省略.........
             }
        } else {
            dissect_ncp_request(next_tvb, pinfo, nw_connection,
                header.sequence, header.type, ncp_tree);
        }
        break;

    case NCP_SERVICE_REPLY:        /* Server NCP Reply */
        next_tvb = tvb_new_subset_remaining(tvb, commhdr);
        nds_defrag(next_tvb, pinfo, nw_connection, header.sequence,
            header.type, ncp_tree, &ncp_tap);
        break;

    case NCP_POSITIVE_ACK:        /* Positive Acknowledgement */
        /*
         * XXX - this used to call "nds_defrag()", which would
         * clear out "frags".  Was that the right thing to
         * do?
         */
        next_tvb = tvb_new_subset_remaining(tvb, commhdr);
        dissect_ncp_reply(next_tvb, pinfo, nw_connection,
            header.sequence, header.type, ncp_tree, &ncp_tap);
        break;

    case NCP_WATCHDOG:        /* Watchdog Packet */
        /*
         * XXX - should the completion code be interpreted as
         * it is in "packet-ncp2222.inc"?  If so, this
         * packet should be handled by "dissect_ncp_reply()".
         */
        proto_tree_add_item(ncp_tree, hf_ncp_completion_code,
            tvb, commhdr + 6, 1, ENC_LITTLE_ENDIAN);
        proto_tree_add_item(ncp_tree, hf_ncp_connection_status,
            tvb, commhdr + 7, 1, ENC_LITTLE_ENDIAN);
        proto_tree_add_item(ncp_tree, hf_ncp_slot,
            tvb, commhdr + 8, 1, ENC_LITTLE_ENDIAN);
        proto_tree_add_item(ncp_tree, hf_ncp_control_code,
            tvb, commhdr + 9, 1, ENC_LITTLE_ENDIAN);
        /*
         * Display the rest of the packet as data.
         */
        if (tvb_offset_exists(tvb, commhdr + 10)) {
            call_dissector(data_handle,
                tvb_new_subset_remaining(tvb, commhdr + 10),
                pinfo, ncp_tree);
        }
        break;

    case NCP_BURST_MODE_XFER:    /* Packet Burst Packet */
        if (flags & SYS) {
            /*
             * System packet; show missing fragments if there
             * are any.
             */
            while (missing_fraglist_count != 0) {
                proto_tree_add_item(ncp_tree, hf_ncp_missing_data_offset,
                    tvb, offset, 4, ENC_BIG_ENDIAN);
                offset += 4;
                proto_tree_add_item(ncp_tree, hf_ncp_missing_data_count,
                    tvb, offset, 2, ENC_BIG_ENDIAN);
                offset += 2;
                missing_fraglist_count--;
            }
        } else {
            /*
             * XXX - do this by using -1 and -1 as the length
             * arguments to "tvb_new_subset()" and then calling
             * "tvb_set_reported_length()"?  That'll throw an
             * exception if "data_len" goes past the reported
             * length of the packet, but that's arguably a
             * feature in this case.
             */
            length_remaining = tvb_length_remaining(tvb, offset);
            if (length_remaining > data_len)
                length_remaining = data_len;
            if (data_len != 0) {
                call_dissector(data_handle,
                    tvb_new_subset(tvb, offset,
                    length_remaining, data_len),
                    pinfo, ncp_tree);
            }
        }
        break;

    case NCP_LIP_ECHO:        /* LIP Echo Packet */
        proto_tree_add_text(ncp_tree, tvb, commhdr, -1,
            "Lip Echo Packet");
        break;

    default:
        expert_item = proto_tree_add_text(ncp_tree, tvb, commhdr + 6, -1,
            "%s packets not supported yet",
            val_to_str(header.type, ncp_type_vals,
                "Unknown type (0x%04x)"));
        if (ncp_echo_err) {
            expert_add_info_format(pinfo, expert_item, &ei_ncp_type, "%s packets not supported yet", val_to_str(header.type, ncp_type_vals, "Unknown type (0x%04x)"));
        }
        break;
    }
}

/*
 * Call this method to actually dissect the multipart body.
 * NOTE - Only do so if a boundary string has been found!
 */
static int dissect_multipart(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
    proto_tree *subtree;
    proto_item *ti;
    proto_item *type_ti;
    multipart_info_t *m_info = get_multipart_info(pinfo, (const char*)data);
    gint header_start = 0;
    gint body_index = 0;
    gboolean last_boundary = FALSE;

    if (m_info == NULL) {
        /*
         * We can't get the required multipart information
         */
        proto_tree_add_expert(tree, pinfo, &ei_multipart_no_required_parameter, tvb, 0, -1);
        call_dissector(data_handle, tvb, pinfo, tree);
        return tvb_reported_length(tvb);
    }
    /* Clean up the memory if an exception is thrown */
    /* CLEANUP_PUSH(cleanup_multipart_info, m_info); */

    /* Add stuff to the protocol tree */
    ti = proto_tree_add_item(tree, proto_multipart,
                             tvb, 0, -1, ENC_NA);
    subtree = proto_item_add_subtree(ti, ett_multipart);
    proto_item_append_text(ti, ", Type: %s, Boundary: \"%s\"",
                           m_info->type, m_info->boundary);

    /* Show multi-part type as a generated field */
    type_ti = proto_tree_add_string(subtree, hf_multipart_type,
                                    tvb, 0, 0, pinfo->match_string);
    PROTO_ITEM_SET_GENERATED(type_ti);

    /*
     * Make no entries in Protocol column and Info column on summary display,
     * but stop sub-dissectors from clearing entered text in summary display.
     */
    col_set_fence(pinfo->cinfo, COL_INFO);

    /*
     * Process the multipart preamble
     */
    header_start = process_preamble(subtree, tvb, m_info, &last_boundary);
    if (header_start == -1) {
        call_dissector(data_handle, tvb, pinfo, subtree);
        /* Clean up the dynamically allocated memory */
        cleanup_multipart_info(m_info);
        return tvb_reported_length(tvb);
    }
    /*
     * Process the encapsulated bodies
     */
    while (last_boundary == FALSE) {
        header_start = process_body_part(subtree, tvb, m_info,
                                         pinfo, header_start, body_index++, &last_boundary);
        if (header_start == -1) {
            /* Clean up the dynamically allocated memory */
            cleanup_multipart_info(m_info);
            return tvb_reported_length(tvb);
        }
    }
    /*
     * Process the multipart trailer
     */
    if (tvb_reported_length_remaining(tvb, header_start) > 0) {
        proto_tree_add_item(subtree, hf_multipart_trailer, tvb, header_start, -1, ENC_NA);
    }
    /* Clean up the dynamically allocated memory */
    cleanup_multipart_info(m_info);
    return tvb_reported_length(tvb);
}

//.........这里部分代码省略.........
		proto_tree_add_uint(fh_tree, etype_id, tvb,
				    offset_after_etype - 2, 2, etype);
	}

	/* Get the captured length and reported length of the data
	   after the Ethernet type. */
	captured_length = tvb_length_remaining(tvb, offset_after_etype);
	reported_length = tvb_reported_length_remaining(tvb,
							offset_after_etype);

	/* Remember how much data there is after the Ethernet type,
	   including any trailer and FCS. */
	length_before = reported_length;

	/* Construct a tvbuff for the payload after the Ethernet type.
	   If the FCS length is positive, remove the FCS.
	   (If it's zero, there's no FCS; if it's negative,
	   we don't know whether there's an FCS, so we'll
	   guess based on the length of the trailer.) */
	if (fcs_len > 0) {
		if (captured_length >= 0 && reported_length >= 0) {
			if (reported_length >= fcs_len)
				reported_length -= fcs_len;
			if (captured_length > reported_length)
				captured_length = reported_length;
		}
	}
	next_tvb = tvb_new_subset(tvb, offset_after_etype, captured_length,
				  reported_length);

	pinfo->ethertype = etype;

	/* Look for sub-dissector, and call it if found.
	   Catch exceptions, so that if the reported length of "next_tvb"
	   was reduced by some dissector before an exception was thrown,
	   we can still put in an item for the trailer. */
	saved_proto = pinfo->current_proto;
	pd_save = pinfo->private_data;
	TRY {
		dissector_found = dissector_try_uint(ethertype_dissector_table,
						     etype, next_tvb, pinfo, tree);
	}
	CATCH(BoundsError) {
		/* Somebody threw BoundsError, which means that:

		   1) a dissector was found, so we don't need to
		   dissect the payload as data or update the
		   protocol or info columns;

		   2) dissecting the payload found that the packet was
		   cut off by a snapshot length before the end of
		   the payload.  The trailer comes after the payload,
		   so *all* of the trailer is cut off, and we'll
		   just get another BoundsError if we add the trailer.

		   Therefore, we just rethrow the exception so it gets
		   reported; we don't dissect the trailer or do anything
		   else. */
		RETHROW;
	}
	CATCH(OutOfMemoryError) {
		RETHROW;
	}
	CATCH_ALL {
		/* Somebody threw an exception other than BoundsError, which
		   means that a dissector was found, so we don't need to
		   dissect the payload as data or update the protocol or info
		   columns.  We just show the exception and then drive on
		   to show the trailer, after noting that a dissector was
		   found and restoring the protocol value that was in effect
		   before we called the subdissector. */
		show_exception(next_tvb, pinfo, tree, EXCEPT_CODE, GET_MESSAGE);

		/*  Restore the private_data structure in case one of the
		 *  called dissectors modified it (and, due to the exception,
		 *  was unable to restore it).
		 */
		pinfo->private_data = pd_save;
		dissector_found = TRUE;
		pinfo->current_proto = saved_proto;
	}
	ENDTRY;

	if (!dissector_found) {
		/* No sub-dissector found.
		   Label rest of packet as "Data" */
		call_dissector(data_handle,next_tvb, pinfo, tree);

		/* Label protocol */
		col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "0x%04x", etype);

		description = match_strval(etype, etype_vals);
		if (description) {
			col_add_str(pinfo->cinfo, COL_INFO, description);
		}
	}

	add_dix_trailer(pinfo, tree, fh_tree, trailer_id, tvb, next_tvb, offset_after_etype,
			length_before, fcs_len);
}

static void
dissect_hci_h4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	guint8      type;
	tvbuff_t    *next_tvb;
	proto_item  *ti = NULL;
	proto_tree  *hci_h4_tree = NULL;
	void        *pd_save;
	hci_data_t  *hci_data;

	col_set_str(pinfo->cinfo, COL_PROTOCOL, "HCI H4");
	switch (pinfo->p2p_dir) {

	case P2P_DIR_SENT:
		col_add_fstr(pinfo->cinfo, COL_INFO, "Sent ");
		break;

	case P2P_DIR_RECV:
		col_add_fstr(pinfo->cinfo, COL_INFO, "Rcvd ");
		break;

	case P2P_DIR_UNKNOWN:
		break;

	default:
		col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown direction %d ",
				pinfo->p2p_dir);
		break;
	}

	type = tvb_get_guint8(tvb, 0);

	if(tree){
		ti = proto_tree_add_item(tree, proto_hci_h4, tvb, 0, 1, ENC_NA);
		hci_h4_tree = proto_item_add_subtree(ti, ett_hci_h4);
	}

	pd_save = pinfo->private_data;
	hci_data = ep_alloc(sizeof(hci_data_t));
	hci_data->interface_id = HCI_INTERFACE_H4;
	hci_data->adapter_id = HCI_ADAPTER_DEFAULT;
	hci_data->chandle_to_bdaddr_table = chandle_to_bdaddr_table;
	hci_data->bdaddr_to_name_table = bdaddr_to_name_table;
	hci_data->localhost_bdaddr = localhost_bdaddr;
	hci_data->localhost_name = localhost_name;
	pinfo->private_data = hci_data;

	ti=proto_tree_add_uint(hci_h4_tree, hf_hci_h4_direction, tvb, 0, 0, pinfo->p2p_dir);
	PROTO_ITEM_SET_GENERATED(ti);

	proto_tree_add_item(hci_h4_tree, hf_hci_h4_type,
		tvb, 0, 1, ENC_LITTLE_ENDIAN);
	col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
			val_to_str(type, hci_h4_type_vals, "Unknown HCI packet type 0x%02x"));

	next_tvb = tvb_new_subset_remaining(tvb, 1);
	if(!dissector_try_uint(hci_h4_table, type, next_tvb, pinfo, tree)) {
		call_dissector(data_handle, next_tvb, pinfo, tree);
	}

	pinfo->private_data = pd_save;
}

//.........这里部分代码省略.........
						/* n_s */
						proto_tree_add_item( netrom_tree, hf_netrom_n_s, tvb, offset, 1, ENC_BIG_ENDIAN );
						offset += 1;

						/* n_r */
						proto_tree_add_item( netrom_tree, hf_netrom_n_r, tvb, offset, 1, ENC_BIG_ENDIAN );
						offset += 1;

						break;
			case NETROM_INFOACK	:
						/* your cct index */
						proto_tree_add_item( netrom_tree, hf_netrom_your_cct_index, tvb, offset, 1, ENC_BIG_ENDIAN );
						offset += 1;

						/* your cct id */
						proto_tree_add_item( netrom_tree, hf_netrom_your_cct_id, tvb, offset, 1, ENC_BIG_ENDIAN );
						offset += 1;

						/* unused */
						offset += 1;

						/* n_r */
						proto_tree_add_item( netrom_tree, hf_netrom_n_r, tvb, offset, 1, ENC_BIG_ENDIAN );
						offset += 1;

						break;
			default			:
						offset += 1;
						offset += 1;
						offset += 1;
						offset += 1;

						break;
			}

		/* type */
		dissect_netrom_type(	tvb,
					offset,
					pinfo,
					netrom_tree,
					hf_netrom_type,
					ett_netrom_type,
					&netrom_type_items
					);
		offset += 1;

		switch ( op_code )
			{
			case NETROM_PROTOEXT	:
						break;
			case NETROM_CONNREQ	:
						/* proposed window size */
						proto_tree_add_item( netrom_tree, hf_netrom_pwindow, tvb, offset, 1, ENC_BIG_ENDIAN );
						offset += 1;

						proto_tree_add_item( netrom_tree, hf_netrom_user, tvb, offset, AX25_ADDR_LEN, ENC_NA );
						offset += AX25_ADDR_LEN;

						proto_tree_add_item( netrom_tree, hf_netrom_node, tvb, offset, AX25_ADDR_LEN, ENC_NA );
						offset += AX25_ADDR_LEN;

						break;
			case NETROM_CONNACK	:
						/* accepted window size */
						proto_tree_add_item( netrom_tree, hf_netrom_awindow, tvb, offset, 1, ENC_BIG_ENDIAN );
						offset += 1;

						break;
			case NETROM_DISCREQ	:
						break;
			case NETROM_DISCACK	:
						break;
			case NETROM_INFO	:
						break;
			case NETROM_INFOACK	:
						break;
			default			:
						break;
			}
		}

	/* Call sub-dissectors here */

	next_tvb = tvb_new_subset_remaining(tvb, offset);

	switch ( op_code )
		{
		case NETROM_PROTOEXT	:
					if ( cct_index == NETROM_PROTO_IP && cct_id == NETROM_PROTO_IP )
						call_dissector( ip_handle , next_tvb, pinfo, tree );
					else
						call_dissector( data_handle , next_tvb, pinfo, tree );

					break;
		case NETROM_INFO	:
		default			:
					call_dissector( data_handle , next_tvb, pinfo, tree );
					break;
		}
}

/*
 * Dissect SNAP header; used elsewhere, e.g. in the Frame Relay dissector.
 */
void
dissect_snap(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
	     proto_tree *snap_tree, int control, int hf_oui, int hf_type, int hf_pid,
	     int bridge_pad)
{
	guint32		oui;
	guint16		etype;
	tvbuff_t	*next_tvb;
	oui_info_t	*oui_info;
	dissector_table_t subdissector_table;
	int		hf;
	int		mesh_header_len;

	/*
	 * XXX - what about non-UI frames?
	 */
	oui =	tvb_get_ntoh24(tvb, offset);
	etype = tvb_get_ntohs(tvb, offset+3);

	col_append_fstr(pinfo->cinfo, COL_INFO,
		    "; SNAP, OUI 0x%06X (%s), PID 0x%04X",
		    oui, val_to_str_const(oui, oui_vals, "Unknown"), etype);

	proto_tree_add_uint(snap_tree, hf_oui, tvb, offset, 3, oui);

	switch (oui) {

	case OUI_HP_2:
		oui_info = get_snap_oui_info(oui);
		hf = *oui_info->field_info->p_id;
		proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2, etype);
		next_tvb = tvb_new_subset_remaining(tvb, offset+5);

		if(!dissector_try_uint(hpteam_subdissector_table,etype, next_tvb, pinfo, tree))
	 		call_dissector(data_handle, next_tvb, pinfo, tree);
		break;

	case OUI_ENCAP_ETHER:
	case OUI_CISCO_90:
	case OUI_APPLE_ATALK:
		/* No, I have no idea why Apple used
		   one of their own OUIs, rather than
		   OUI_ENCAP_ETHER, and an Ethernet
		   packet type as protocol ID, for
		   AppleTalk data packets - but used
		   OUI_ENCAP_ETHER and an Ethernet
		   packet type for AARP packets. */
		if (XDLC_IS_INFORMATION(control)) {
			if (tree) {
				proto_tree_add_uint(snap_tree, hf_type,
				    tvb, offset+3, 2, etype);
			}
			next_tvb = tvb_new_subset_remaining(tvb, offset+5);
			if (!dissector_try_uint(ethertype_subdissector_table,
			    etype, next_tvb, pinfo, tree))
				call_dissector(data_handle, next_tvb, pinfo,
				    tree);
		} else {
			next_tvb = tvb_new_subset_remaining(tvb, offset+5);
			call_dissector(data_handle, next_tvb, pinfo, tree);
		}
		break;

	case OUI_IEEE_802_1:
		/*
		 * MAC frames bridged over ATM (RFC 2684) or Frame Relay
		 * (RFC 2427).
		 *
		 * We have to figure out how much padding to put
		 * into the frame.  We were handed a "bridge_pad"
		 * argument which should be 0 for Frame Relay and
		 * 2 for ATM; we add to that the amount of padding
		 * common to both bridging types.
		 */
		if (tree) {
			proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2,
			    etype);
		}

		switch (etype) {

		case BPID_ETH_WITH_FCS:
			next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
			call_dissector(eth_withfcs_handle, next_tvb, pinfo,
			    tree);
			break;

		case BPID_ETH_WITHOUT_FCS:
			next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
			call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
			break;

		case BPID_802_5_WITH_FCS:
		case BPID_802_5_WITHOUT_FCS:
			/*
			 * We treat the last padding byte as the Access
			 * Control byte, as that's what the Token
//.........这里部分代码省略.........

/* Code to actually dissect the packets */
static void
dissect_ehdlc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	int  offset = 4;

	col_set_str(pinfo->cinfo, COL_PROTOCOL, "EHDLC");
	col_clear(pinfo->cinfo, COL_INFO);

	while (tvb_reported_length_remaining(tvb, offset) > 0) {
		proto_item *ti            = NULL;
		proto_tree *ehdlc_tree    = NULL;
		guint16     len, msg_type;
		tvbuff_t   *next_tvb;
		guint16     control;
		gboolean    is_response   = FALSE, is_extended = TRUE;
		gint        header_length = 2; /* Address + Length field */

		msg_type      = tvb_get_guint8(tvb, offset);
		len           = tvb_get_guint8(tvb, offset+1);
#if 0
		col_append_fstr(pinfo->cinfo, COL_INFO, "%s ",
		                val_to_str(msg_type, ehdlc_protocol_vals,
		                           "unknown 0x%02x"));
#endif
		if (tree) {
			/* Use MIN(...,...) in the following to prevent a premature */
			/* exception before we try to dissect whatever is available. */
			ti = proto_tree_add_protocol_format(tree, proto_ehdlc,
					tvb, offset, MIN(len, tvb_length_remaining(tvb,offset)),
					"Ericsson HDLC protocol, type: %s",
					val_to_str(msg_type, ehdlc_protocol_vals,
						   "unknown 0x%02x"));
			ehdlc_tree = proto_item_add_subtree(ti, ett_ehdlc);
			proto_tree_add_item(ehdlc_tree, hf_ehdlc_protocol,
					    tvb, offset, 1, ENC_BIG_ENDIAN);
#if 0
			proto_tree_add_item(ehdlc_tree, hf_ehdlc_sapi,
					    tvb, offset, 1, ENC_BIG_ENDIAN);
			proto_tree_add_item(ehdlc_tree, hf_ehdlc_c_r,
					    tvb, offset, 1, ENC_BIG_ENDIAN);
#endif
			proto_tree_add_item(ehdlc_tree, hf_ehdlc_data_len,
					    tvb, offset+1, 1, ENC_BIG_ENDIAN);
		}

		control = dissect_xdlc_control(tvb, offset+2, pinfo, ehdlc_tree, hf_ehdlc_control,
					       ett_ehdlc_control, &ehdlc_cf_items, &ehdlc_cf_items_ext,
					       NULL, NULL, is_response, is_extended, FALSE);
		header_length += XDLC_CONTROL_LEN(control, is_extended);

		if (XDLC_IS_INFORMATION(control)) {
			next_tvb = tvb_new_subset(tvb, offset+header_length,
						  len-header_length, len-header_length);

			switch (msg_type) {
			case 0x20:
				/* len == 4 seems to be some kind of ACK */
				if (len <= 4)
					break;
				call_dissector(sub_handles[SUB_RSL], next_tvb, pinfo, tree);
				break;
			case 0xbc:
			case 0xdc:
			case 0xa0:
			case 0xc0:
				/* len == 4 seems to be some kind of ACK */
				if (len <= 4)
					break;
				call_dissector(sub_handles[SUB_OML], next_tvb, pinfo, tree);
				break;
			default:
				call_dissector(sub_handles[SUB_DATA], next_tvb, pinfo, tree);
				break;
			}
		} else if (control == (XDLC_U | XDLC_XID)) {
			/* XID is formatted like ISO 8885, typically we see
 			 * something like
			 * 82		format identifier
			 * 80		group identifier
			 * 00 09 	length
			 * 07 01 05 	Window Size Tx
			 * 09 01 04	Ack Timer (msec)
			 * 08 01 05	Window Size Rx */
			proto_tree_add_item(ehdlc_tree, hf_ehdlc_xid_payload,
					    tvb, offset+header_length,
					    len-header_length, ENC_NA);
		}

		if (len == 0)
			len = 1;
		offset += len;
	}
}

static int
dissect_text_lines(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
	proto_tree	*subtree;
	proto_item	*ti;
	gint		offset = 0, next_offset;
	gint		len;
	const char	*data_name;
	int length = tvb_length(tvb);

	/* Check if this is actually xml
	 * If there is less than 38 characters this is not XML
	 * <?xml version="1.0" encoding="UTF-8"?>
	 */
	if(length > 38){
		if (tvb_strncaseeql(tvb, 0, "<?xml", 5) == 0){
			call_dissector(xml_handle, tvb, pinfo, tree);
			return length;
		}
	}

	data_name = pinfo->match_string;
	if (! (data_name && data_name[0])) {
		/*
		 * No information from "match_string"
		 */
		data_name = (char *)data;
		if (! (data_name && data_name[0])) {
			/*
			 * No information from dissector data
			 */
			data_name = NULL;
		}
	}

	if (data_name)
		col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)",
				data_name);

	if (tree) {
		ti = proto_tree_add_item(tree, proto_text_lines,
				tvb, 0, -1, ENC_NA);
		if (data_name)
			proto_item_append_text(ti, ": %s", data_name);
		subtree = proto_item_add_subtree(ti, ett_text_lines);
		/* Read the media line by line */
		while (tvb_offset_exists(tvb, offset)) {
			/*
			 * XXX - we need to be passed the parameters
			 * of the content type via data parameter,
			 * so that we know the character set.  We'd
			 * have to handle that character set, which
			 * might be a multibyte character set such
			 * as "iso-10646-ucs-2", or might require other
			 * special processing.
			 */
			len = tvb_find_line_end(tvb, offset,
					tvb_ensure_length_remaining(tvb, offset),
					&next_offset, FALSE);
			if (len == -1)
				break;

			/* We use next_offset - offset instead of len in the
			 * call to proto_tree_add_format_text() so it will include the
			 * line terminator(s) (\r and/or \n) in the display.
			 */
			proto_tree_add_format_text(subtree, tvb, offset, next_offset - offset);
			offset = next_offset;
		}
	}

	return length;
}

//.........这里部分代码省略.........
                pinfo->desegment_len = frame_len - bytes_remaining;
                return (TRUE);
            }
        }

        pflags = tvb_get_guint8 (tvb, start+8);

        if (tree) {
            if (FCIP_IS_SF (pflags)) {
                ti = proto_tree_add_protocol_format (tree, proto_fcip, tvb, 0,
                                                     FCIP_ENCAP_HEADER_LEN,
                                                     "FCIP");
            }
            else if (tvb_bytes_exist (tvb, offset, offset+frame_len-4)) {
                sof = tvb_get_guint8 (tvb, offset+FCIP_ENCAP_HEADER_LEN);
                eof = tvb_get_guint8 (tvb, offset+frame_len - 4);

                ti = proto_tree_add_protocol_format (tree, proto_fcip, tvb, 0,
                                                     FCIP_ENCAP_HEADER_LEN,
                                                     "FCIP (%s/%s)",
                                                     val_to_str (sof, fcip_sof_vals,
                                                                 "0x%x"),
                                                     val_to_str (eof, fcip_eof_vals,
                                                                 "0x%x"));
            }
            else {
                sof = tvb_get_guint8 (tvb, offset+FCIP_ENCAP_HEADER_LEN);

                ti = proto_tree_add_protocol_format (tree, proto_fcip, tvb, 0,
                                                     FCIP_ENCAP_HEADER_LEN,
                                                     "FCIP (%s/%s)",
                                                     val_to_str (sof, fcip_sof_vals,
                                                                 "0x%x"),
                                                     "NA");
            }
            fcip_tree = proto_item_add_subtree (ti, ett_fcip);
            /* Dissect the Common FC Encap header */
            dissect_fcencap_header (tvb, fcip_tree, offset);

            offset += FCIP_ENCAP_HEADER_LEN;

            if (!FCIP_IS_SF (pflags)) {
                /* print SOF */
                proto_tree_add_item (fcip_tree, hf_fcip_sof, tvb, offset, 1, ENC_BIG_ENDIAN);
                proto_tree_add_item (fcip_tree, hf_fcip_sof_c, tvb, offset+2, 1, ENC_BIG_ENDIAN);
                /* print EOF */

                offset += (frame_len-FCIP_ENCAP_HEADER_LEN-4);
                if (tvb_bytes_exist (tvb, offset, 4)) {
                    proto_tree_add_item (fcip_tree, hf_fcip_eof, tvb, offset, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item (fcip_tree, hf_fcip_eof_c, tvb, offset+2, 1, ENC_BIG_ENDIAN);
                }
            }
        }

        /* Call the FC Dissector if this is carrying an FC frame */
        if (!FCIP_IS_SF(pflags)) {
            /* Set the SOF/EOF flags in the packet_info header */
            fc_data.sof_eof = 0;

            if (sof) {
                if ((sof == FCIP_SOFi3) || (sof == FCIP_SOFi2) || (sof == FCIP_SOFi4)) {
                    fc_data.sof_eof = FC_DATA_SOF_FIRST_FRAME;
                }
                else if (sof == FCIP_SOFf) {
                    fc_data.sof_eof = FC_DATA_SOF_SOFF;
                }

                if (eof != FCIP_EOFn) {
                    fc_data.sof_eof |= FC_DATA_EOF_LAST_FRAME;
                }
                else if (eof != FCIP_EOFt) {
                    fc_data.sof_eof |= FC_DATA_EOF_INVALID;
                }
            }

            /* Special frame bit is not set */
            next_tvb = tvb_new_subset_remaining (tvb, FCIP_ENCAP_HEADER_LEN+4);
            if (fc_handle) {
                fc_data.ethertype = 0;
                call_dissector_with_data(fc_handle, next_tvb, pinfo, tree, &fc_data);
            }
            else if (data_handle) {
                call_dissector (data_handle, next_tvb, pinfo, tree);
            }
        }
        else {
            col_set_str(pinfo->cinfo, COL_INFO, "Special Frame");
            if (FCIP_IS_CH (pflags)) {
                col_append_str(pinfo->cinfo, COL_INFO, "(Changed)");
            }

            dissect_fcip_sf (tvb, fcip_tree, offset+4);
        }

        bytes_remaining -= frame_len;
    }

    return (TRUE);
}

/* Code to actually dissect the packets */
static void
dissect_sm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	proto_item *ti;
	proto_tree *sm_tree;
	tvbuff_t *next_tvb = NULL;
	guint32 sm_message_type;
	guint16 protocol;
	guint16 msg_type = 0;
	guint16 length;
	guint16 tag;
	int     offset = 0;

	sm_message_type = tvb_get_ntohl(tvb,offset);

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

	col_add_fstr(pinfo->cinfo, COL_INFO, "Cisco SM Packet (%s)",
		val_to_str(sm_message_type, sm_message_type_value_info,"reserved"));

	ti = proto_tree_add_item(tree, proto_sm, tvb, offset, 0, ENC_NA);
	sm_tree = proto_item_add_subtree(ti, ett_sm);

	proto_tree_add_uint_format(sm_tree, hf_sm_sm_msg_type, tvb, offset, 4, sm_message_type,
		"SM Message type: %s (0x%0x)", val_to_str(sm_message_type, sm_message_type_value, "reserved"), sm_message_type);

	offset = offset + 4;
	if (sm_message_type ==  MESSAGE_TYPE_PDU) {
		proto_tree_add_item(sm_tree, hf_sm_protocol, tvb, offset, 2, ENC_BIG_ENDIAN);
		protocol = tvb_get_ntohs(tvb,offset);
		offset = offset + 2;
		switch(protocol){
		case SM_PROTOCOL_X100:
		case SM_PROTOCOL_X122:
			if (!tree)
				return;
			/* Protocol 0x100/0x122 only contains a length and then an EISUP packet */
			proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
			length = tvb_get_ntohs(tvb,offset);
			offset = offset + 2;
			proto_item_set_len(ti, 8);

			/* This should be the EISUP dissector but we havent got one
			 * right now - so decode it as data for now ... */
			next_tvb = tvb_new_subset(tvb, offset, length, length);
			call_dissector(data_handle, next_tvb, pinfo, sm_tree);

			break;
		case SM_PROTOCOL_X101:
			if (!tree)
				return;
			/* XXX Reveres enginered so this may not be correct!!!
			 * EISUP - used between Cisco HSI and Cisco PGW devices,
			 * uses RUDP with default port number 8003.
			 * Protocol stack is RUDP->Cisco SM->SDP.
			 * This implementation is PROPRIETARY
			 */
			proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
			length = tvb_get_ntohs(tvb,offset);
			offset = offset + 2;
			proto_item_set_len(ti, length + offset);
			/* The next stuff seems to be IP addr */
			proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
			offset = offset + 4;
			/* This part looks to be the same per session */
			proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN);
			offset = offset +4;
			/* Some sort of message type? */
			proto_tree_add_item(sm_tree, hf_sm_eisup_msg_id, tvb, offset, 1, ENC_BIG_ENDIAN);
			offset = offset + 1;
			/* XXX Problem are tags 1 or two bytes???*/
			proto_tree_add_item(sm_tree, hf_sm_tag, tvb, offset, 2, ENC_BIG_ENDIAN);

			tag = tvb_get_ntohs(tvb,offset);
			offset = offset +2;
			if (tag== 0x01ac) {
				proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
				length = tvb_get_ntohs(tvb,offset);
				offset = offset +2;
				next_tvb = tvb_new_subset(tvb, offset, length, length);
				call_dissector(sdp_handle, next_tvb, pinfo, sm_tree);
				offset = offset+length;

			}
			/*return;*/
			break;
		case SM_PROTOCOL_X114:
			if (!tree)
				return;
			/* XXX Reveres enginered so this may not be correct!!! */
			proto_tree_add_item(sm_tree, hf_sm_len, tvb, offset, 2, ENC_BIG_ENDIAN);
			length = tvb_get_ntohs(tvb,offset);
			offset = offset + 2;
			proto_item_set_len(ti, length + offset);
			/* The next stuff seems to be IP addr */
			proto_tree_add_item(sm_tree, hf_sm_ip_addr, tvb, offset, 4, ENC_BIG_ENDIAN);
			offset = offset + 4;
			proto_tree_add_item(sm_tree, hf_sm_context, tvb, offset, 4, ENC_BIG_ENDIAN);
			offset = offset +4;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	}
	segment_offset+= (int)length;

	if ((segment_offset + frame_offset < segment_offset) || (segment_offset + frame_offset < frame_offset)) {
	/* Addition result has wrapped */
		return 0;
	}
	if((unsigned)(frame_offset + segment_offset) > tvb_captured_length(tvb)){
	/* This would mean the data segment is incomplete */
		return 0;
	}

	/* Create a subtree for data segment and add the other fields under it */
	ltp_data_tree = proto_tree_add_subtree(ltp_tree, tvb,frame_offset, segment_offset, ett_data_segm, NULL, "Data Segment");

	proto_tree_add_uint64(ltp_data_tree,hf_ltp_data_clid, tvb, frame_offset,client_id_size,client_id);
	frame_offset += client_id_size;

	proto_tree_add_uint64(ltp_data_tree, hf_ltp_data_offset, tvb, frame_offset,offset_size, offset);
	frame_offset += offset_size;

	proto_tree_add_uint64(ltp_data_tree,hf_ltp_data_length, tvb, frame_offset,length_size,length);
	frame_offset += length_size;

	if(ltp_type != 0 )
	{
		proto_tree_add_uint64(ltp_data_tree, hf_ltp_data_chkp, tvb, frame_offset,chkp_sno_size, chkp_sno);
		frame_offset += chkp_sno_size;

		proto_tree_add_uint64(ltp_data_tree, hf_ltp_data_rpt, tvb, frame_offset,rpt_sno_size, rpt_sno);
		frame_offset += rpt_sno_size;

		more_frags = FALSE;
		frag_msg = fragment_add_check(&ltp_reassembly_table,
			  tvb, frame_offset, pinfo, (guint32)session_num, NULL,
			  (guint32)offset, (guint32)length, more_frags);
	}
	else
	{
		more_frags = TRUE;
		frag_msg = fragment_add_check(&ltp_reassembly_table,
			 tvb, frame_offset, pinfo, (guint32)session_num, NULL,
			 (guint32)offset, (guint32)length, more_frags);

	}


	if(frag_msg)
	{
		/* Checking if the segment is completely reassembled */
		if(!(frag_msg->flags & FD_PARTIAL_REASSEMBLY))
		{
			/* if the segment has not been fragmented, then no reassembly is needed */
			if(!more_frags && offset == 0)
			{
				new_tvb = tvb_new_subset_remaining(tvb,frame_offset);
			}
			else
			{
				new_tvb = process_reassembled_data(tvb, frame_offset, pinfo, "Reassembled LTP Segment",
					frag_msg, &ltp_frag_items,NULL, ltp_data_tree);

			}
		}
	}

	if(new_tvb)
	{
		data_length = tvb_captured_length(new_tvb);
		while(dissected_data_size < data_length)
		{
			ltp_data_data_tree = proto_tree_add_subtree_format(ltp_data_tree, tvb,frame_offset, 0,
												ett_data_data_segm, NULL, "Data[%d]",data_count);

			datatvb = tvb_new_subset(new_tvb, data_offset, (int)data_length - dissected_data_size, tvb_captured_length(new_tvb));
			bundle_size = call_dissector(bundle_handle, datatvb, pinfo, ltp_data_data_tree);
			if(bundle_size == 0) {  /*Couldn't parse bundle*/
				col_set_str(pinfo->cinfo, COL_INFO, "Dissection Failed");
				return 0;           /*Give up*/
			}
			data_offset += bundle_size;
			dissected_data_size += bundle_size;
			data_count++;
		}
	}
	else
	{
		if(frag_msg && more_frags)
		{
			col_append_fstr(pinfo->cinfo, COL_INFO, "[Reassembled in %d] ",frag_msg->reassembled_in);
		}
		else
		{
			col_append_str(pinfo->cinfo, COL_INFO, "[Unfinished LTP Segment] ");
		}

	}

	return segment_offset;
}

//.........这里部分代码省略.........
        if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_START_POS) || BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) {

            proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_fragid, tvb, cur_off + new_off, 1, ENC_BIG_ENDIAN);

            new_off += 1;
        }
        if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_START_POS) && BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) {

            proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_totlength, tvb, cur_off + new_off, 2, ENC_BIG_ENDIAN);
            col_append_str(pinfo->cinfo, COL_INFO, "(frag) ");

            new_off += 2;
        }
        if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_START_POS)) {
            gse_proto = tvb_get_ntohs(tvb, cur_off + new_off);

            proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_proto, tvb, cur_off + new_off, 2, ENC_BIG_ENDIAN);

            new_off += 2;

            if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_LABELTYPE_POS1) && BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_LABELTYPE_POS2)) {
                /* 6 byte label */
                if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS))
                    col_append_str(pinfo->cinfo, COL_INFO, "6 ");

                proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_label6, tvb, cur_off + new_off, 6, ENC_NA);

                new_off += 6;
            } else if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_LABELTYPE_POS1) &&
                       BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_LABELTYPE_POS2)) {
                /* 3 byte label */
                if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS))
                    col_append_str(pinfo->cinfo, COL_INFO, "3 ");

                proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_label3, tvb, cur_off + new_off, 3, ENC_NA);

                new_off += 3;
            } else {
                /* 0 byte label */
                if (BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS))
                    col_append_str(pinfo->cinfo, COL_INFO, "0 ");
            }
            if (gse_proto < 0x0600 && gse_proto >= 0x100) {
                /* Only display optional extension headers */
                /* TODO: needs to be tested */

                /* TODO: implementation needs to be checked (len of ext-header??) */
                proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_exthdr, tvb, cur_off + new_off, 1, ENC_BIG_ENDIAN);

                new_off += 1;
            }
        }
        else
        {
            /* correct cinfo */
            col_append_str(pinfo->cinfo, COL_INFO, "(frag) ");
        }

        next_tvb = tvb_new_subset_remaining(tvb, cur_off + new_off);

        if (dvb_s2_full_dissection)
        {
            switch (gse_proto) {
            case ETHERTYPE_IP:
                new_off += call_dissector(ip_handle, next_tvb, pinfo, tree);
                break;
            case ETHERTYPE_IPv6:
                new_off += call_dissector(ipv6_handle, next_tvb, pinfo, tree);
                break;
            default:
                if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_START_POS) && BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) {
                    data_len = (gse_hdr & DVB_S2_GSE_HDR_LENGTH_MASK) - (new_off - DVB_S2_GSE_MINSIZE) - DVB_S2_GSE_CRC32_LEN;
                } else
                    data_len = (gse_hdr & DVB_S2_GSE_HDR_LENGTH_MASK) - (new_off - DVB_S2_GSE_MINSIZE);

                proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_data, tvb, cur_off + new_off, data_len, ENC_NA);
                new_off += data_len;
                break;
            }
        }
        else
        {
            if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_START_POS) && BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) {
                data_len = (gse_hdr & DVB_S2_GSE_HDR_LENGTH_MASK) - (new_off - DVB_S2_GSE_MINSIZE) - DVB_S2_GSE_CRC32_LEN;
            } else
                data_len = (gse_hdr & DVB_S2_GSE_HDR_LENGTH_MASK) - (new_off - DVB_S2_GSE_MINSIZE);

            proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_data, tvb, cur_off + new_off, data_len, ENC_NA);
            new_off += data_len;
        }

        /* add crc32 if last fragment */
        if (BIT_IS_CLEAR(gse_hdr, DVB_S2_GSE_HDR_START_POS) && BIT_IS_SET(gse_hdr, DVB_S2_GSE_HDR_STOP_POS)) {
            proto_tree_add_item(dvb_s2_gse_tree, hf_dvb_s2_gse_crc32, tvb, cur_off + new_off, DVB_S2_GSE_CRC32_LEN, ENC_NA);
            new_off += DVB_S2_GSE_CRC32_LEN;
        }
    }

    return new_off;
}

//.........这里部分代码省略.........
			PROTO_ITEM_SET_GENERATED(item);
			item = proto_tree_add_string(fh_tree, hf_file_color_filter_text, tvb,
						     0, 0, color_filter->filter_text);
			PROTO_ITEM_SET_GENERATED(item);
		}
	}

	if (pinfo->fd->flags.ignored) {
		/* Ignored package, stop handling here */
		col_set_str(pinfo->cinfo, COL_INFO, "<Ignored>");
		proto_tree_add_text (tree, tvb, 0, -1, "This record is marked as ignored");
		return;
	}

	/* Portable Exception Handling to trap Wireshark specific exceptions like BoundsError exceptions */
	TRY {
#ifdef _MSC_VER
		/* Win32: Visual-C Structured Exception Handling (SEH) to trap hardware exceptions
		   like memory access violations.
		   (a running debugger will be called before the except part below) */
                /* Note: A Windows "exceptional exception" may leave the kazlib's (Portable Exception Handling)
                   stack in an inconsistent state thus causing a crash at some point in the
                   handling of the exception.
                   See: https://www.wireshark.org/lists/wireshark-dev/200704/msg00243.html
                */
		__try {
#endif
			if (!dissector_try_uint(file_encap_dissector_table, pinfo->fd->lnk_t,
						tvb, pinfo, parent_tree)) {

				col_set_str(pinfo->cinfo, COL_PROTOCOL, "UNKNOWN");
				col_add_fstr(pinfo->cinfo, COL_INFO, "FTAP_ENCAP = %d",
					     pinfo->fd->lnk_t);
				call_dissector(data_handle,tvb, pinfo, parent_tree);
			}
#ifdef _MSC_VER
		} __except(EXCEPTION_EXECUTE_HANDLER /* handle all exceptions */) {
			switch(GetExceptionCode()) {
			case(STATUS_ACCESS_VIOLATION):
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       "STATUS_ACCESS_VIOLATION: dissector accessed an invalid memory address");
				break;
			case(STATUS_INTEGER_DIVIDE_BY_ZERO):
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       "STATUS_INTEGER_DIVIDE_BY_ZERO: dissector tried an integer division by zero");
				break;
			case(STATUS_STACK_OVERFLOW):
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       "STATUS_STACK_OVERFLOW: dissector overflowed the stack (e.g. endless loop)");
				/* XXX - this will have probably corrupted the stack,
				   which makes problems later in the exception code */
				break;
				/* XXX - add other hardware exception codes as required */
			default:
				show_exception(tvb, pinfo, parent_tree, DissectorError,
					       g_strdup_printf("dissector caused an unknown exception: 0x%x", GetExceptionCode()));
			}
		}
#endif
	}
	CATCH_BOUNDS_AND_DISSECTOR_ERRORS {
		show_exception(tvb, pinfo, parent_tree, EXCEPT_CODE, GET_MESSAGE);
	}
	ENDTRY;

    if(proto_field_is_referenced(tree, hf_file_protocols)) {

//.........这里部分代码省略.........
     && pktlen >= MDSHDR_TRAILER_SIZE ) {
        trailer_start = MDSHDR_HEADER_SIZE + pktlen - MDSHDR_TRAILER_SIZE; 
    
        eof = tvb_get_guint8 (tvb, trailer_start);
        tvb_set_reported_length (tvb, MDSHDR_HEADER_SIZE+pktlen);
    }
    else {
        eof = MDSHDR_EOF_UNKNOWN;
    }

    pinfo->src_idx = (tvb_get_ntohs (tvb, MDSHDR_SIDX_OFFSET) & 0x3FF);
    pinfo->dst_idx = (tvb_get_ntohs (tvb, MDSHDR_DIDX_OFFSET) & 0xFFC) >> 2;
    pinfo->vsan = vsan;
    pinfo->sof_eof = 0;

    if ((sof == MDSHDR_SOFi3) || (sof == MDSHDR_SOFi2) || (sof == MDSHDR_SOFi1)
        || (sof == MDSHDR_SOFi4)) {
        pinfo->sof_eof = PINFO_SOF_FIRST_FRAME;
    }
    else if (sof == MDSHDR_SOFf) {
        pinfo->sof_eof = PINFO_SOF_SOFF;      
    }

    if (eof != MDSHDR_EOFn) {
        pinfo->sof_eof |= PINFO_EOF_LAST_FRAME;
    }
    else if (eof != MDSHDR_EOFt) {
        pinfo->sof_eof |= PINFO_EOF_INVALID;
    }
    
    /* In the interest of speed, if "tree" is NULL, don't do any work not
       necessary to generate protocol tree items. */
    if (tree) {

        /* create display subtree for the protocol */
        ti_main = proto_tree_add_protocol_format (tree, proto_mdshdr, tvb, 0,
                                                  MDSHDR_HEADER_SIZE+pktlen,
                                                  "MDS Header(%s/%s)", 
						  val_to_str(sof, sof_vals, "Unknown(%u)"),
                                                  val_to_str(eof, eof_vals, "Unknown(%u)"));

        mdshdr_tree_main = proto_item_add_subtree (ti_main, ett_mdshdr);

        /* Add Header part as subtree first */
        ti_hdr = proto_tree_add_text (mdshdr_tree_main, tvb, MDSHDR_VER_OFFSET,
                                      MDSHDR_HEADER_SIZE, "MDS Header");

        mdshdr_tree_hdr = proto_item_add_subtree (ti_hdr, ett_mdshdr_hdr);
        hidden_item = proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_sof, tvb, MDSHDR_SOF_OFFSET,
                                    MDSHDR_SIZE_BYTE, 0);
        PROTO_ITEM_SET_HIDDEN(hidden_item);
        proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_pkt_len, tvb, MDSHDR_PKTLEN_OFFSET, 
                             MDSHDR_SIZE_INT16, 0);
        proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_dstidx, tvb, MDSHDR_DIDX_OFFSET,
                             MDSHDR_SIZE_INT16, 0);
        proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_srcidx, tvb, MDSHDR_SIDX_OFFSET,
                             MDSHDR_SIZE_INT16, 0);
        proto_tree_add_item (mdshdr_tree_hdr, hf_mdshdr_vsan, tvb, MDSHDR_VSAN_OFFSET,
                             MDSHDR_SIZE_INT16, 0);
        hidden_item = proto_tree_add_uint(mdshdr_tree_hdr, hf_mdshdr_span,
                                   tvb, MDSHDR_VSAN_OFFSET,
                                   MDSHDR_SIZE_BYTE, span_id);
        PROTO_ITEM_SET_HIDDEN(hidden_item);
        
        /* Add Mdshdr Trailer part */
        if (tvb_length (tvb) >= MDSHDR_HEADER_SIZE + pktlen
         && 0 != trailer_start) {
            ti_trlr = proto_tree_add_text (mdshdr_tree_main, tvb, trailer_start,
                                           MDSHDR_TRAILER_SIZE,
                                           "MDS Trailer");
            mdshdr_tree_trlr = proto_item_add_subtree (ti_trlr, ett_mdshdr_trlr);
        
            proto_tree_add_item (mdshdr_tree_trlr, hf_mdshdr_eof, tvb,
                                 trailer_start, MDSHDR_SIZE_BYTE, 0);
            proto_tree_add_item (mdshdr_tree_trlr, hf_mdshdr_fccrc, tvb,
                                 trailer_start+2, MDSHDR_SIZE_INT32, 0);
        }
        else {
            proto_tree_add_text (mdshdr_tree_main, tvb, 0, 0, "MDS Trailer: Not Found");        
        }
    }
    
    /* If this protocol has a sub-dissector call it here, see section 1.8 */
    if (tvb_length (tvb) >= MDSHDR_HEADER_SIZE + pktlen
     && 0 != pktlen /*if something wrong*/) {
        next_tvb = tvb_new_subset (tvb, MDSHDR_HEADER_SIZE, pktlen, pktlen);
        /* XXX what to do with the rest of this frame? --ArtemTamazov */
    }
    else {
        next_tvb = tvb_new_subset_remaining (tvb, MDSHDR_HEADER_SIZE);
    }

    /* Call the Fibre Channel dissector */
    if (fc_dissector_handle) {
        call_dissector (fc_dissector_handle, next_tvb, pinfo, tree);
    }
    else {
        call_dissector (data_handle, next_tvb, pinfo, tree);
    }
}

static void
dissect_clnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
  proto_tree     *clnp_tree = NULL;
  proto_item     *ti;
  guint8          cnf_proto_id;
  guint8          cnf_hdr_len;
  guint8          cnf_vers;
  guint8          cnf_ttl;
  guint8          cnf_type;
  char            flag_string[6+1];
  const char     *pdu_type_string;
  proto_tree     *type_tree;
  guint16         segment_length;
  guint16         du_id = 0;
  guint16         segment_offset = 0;
  guint16         cnf_cksum;
  cksum_status_t  cksum_status;
  int             offset;
  guchar          src_len, dst_len, nsel, opt_len = 0;
  const guint8   *dst_addr, *src_addr;
  guint           next_length;
  proto_tree     *discpdu_tree;
  gboolean        save_in_error_pkt;
  fragment_data  *fd_head;
  tvbuff_t       *next_tvb;
  gboolean        update_col_info = TRUE;
  gboolean        save_fragmented;

  col_set_str(pinfo->cinfo, COL_PROTOCOL, "CLNP");
  col_clear(pinfo->cinfo, COL_INFO);

  cnf_proto_id = tvb_get_guint8(tvb, P_CLNP_PROTO_ID);
  if (cnf_proto_id == NLPID_NULL) {
    col_set_str(pinfo->cinfo, COL_INFO, "Inactive subset");
    if (tree) {
      ti = proto_tree_add_item(tree, proto_clnp, tvb, P_CLNP_PROTO_ID, 1, ENC_NA);
      clnp_tree = proto_item_add_subtree(ti, ett_clnp);
      proto_tree_add_uint_format(clnp_tree, hf_clnp_id, tvb, P_CLNP_PROTO_ID, 1,
                                 cnf_proto_id,
                                 "Inactive subset");
    }
    next_tvb = tvb_new_subset_remaining(tvb, 1);
    if (call_dissector(ositp_inactive_handle, next_tvb, pinfo, tree) == 0)
      call_dissector(data_handle,tvb, pinfo, tree);
    return;
  }

  /* return if version not known */
  cnf_vers = tvb_get_guint8(tvb, P_CLNP_VERS);
  if (cnf_vers != ISO8473_V1) {
    call_dissector(data_handle,tvb, pinfo, tree);
    return;
  }

  /* fixed part decoding */
  cnf_hdr_len = tvb_get_guint8(tvb, P_CLNP_HDR_LEN);
  opt_len = cnf_hdr_len;

  if (tree) {
    ti = proto_tree_add_item(tree, proto_clnp, tvb, 0, cnf_hdr_len, ENC_NA);
    clnp_tree = proto_item_add_subtree(ti, ett_clnp);
    proto_tree_add_uint(clnp_tree, hf_clnp_id, tvb, P_CLNP_PROTO_ID, 1,
                        cnf_proto_id);
    proto_tree_add_uint(clnp_tree, hf_clnp_length, tvb, P_CLNP_HDR_LEN, 1,
                        cnf_hdr_len);
    proto_tree_add_uint(clnp_tree, hf_clnp_version, tvb, P_CLNP_VERS, 1,
                        cnf_vers);
    cnf_ttl = tvb_get_guint8(tvb, P_CLNP_TTL);
    proto_tree_add_uint_format(clnp_tree, hf_clnp_ttl, tvb, P_CLNP_TTL, 1,
                               cnf_ttl,
                               "Holding Time : %u (%u.%u secs)",
                               cnf_ttl, cnf_ttl / 2, (cnf_ttl % 2) * 5);
  }

  cnf_type = tvb_get_guint8(tvb, P_CLNP_TYPE);
  pdu_type_string = val_to_str(cnf_type & CNF_TYPE, npdu_type_abbrev_vals,
                               "Unknown (0x%02x)");
  flag_string[0] = '\0';
  if (cnf_type & CNF_SEG_OK)
    g_strlcat(flag_string, "S ", 7);
  if (cnf_type & CNF_MORE_SEGS)
    g_strlcat(flag_string, "M ", 7);
  if (cnf_type & CNF_ERR_OK)
    g_strlcat(flag_string, "E ", 7);
  if (tree) {
    ti = proto_tree_add_uint_format(clnp_tree, hf_clnp_type, tvb, P_CLNP_TYPE, 1,
                                    cnf_type,
                                    "PDU Type     : 0x%02x (%s%s)",
                                    cnf_type,
                                    flag_string,
                                    pdu_type_string);
    type_tree = proto_item_add_subtree(ti, ett_clnp_type);
    proto_tree_add_text(type_tree, tvb, P_CLNP_TYPE, 1, "%s",
                        decode_boolean_bitfield(cnf_type, CNF_SEG_OK, 8,
                                                "Segmentation permitted",
                                                "Segmentation not permitted"));
    proto_tree_add_text(type_tree, tvb, P_CLNP_TYPE, 1, "%s",
                        decode_boolean_bitfield(cnf_type, CNF_MORE_SEGS, 8,
                                                "More segments",
//.........这里部分代码省略.........