Class UnknownI2NPMessage

  • All Implemented Interfaces:
    I2NPMessage

    public class UnknownI2NPMessage
    extends FastI2NPMessageImpl
    This is similar to DataMessage or GarlicMessage but with a variable message type. This is defined so routers can route messages they don't know about. We don't extend those classes so that any code that does (instanceof foo) won't return true for this type. Load tests use DataMessage, for example. Also, those classes include an additional length field that we can't use here. See InboundMessageDistributor. There is no setData() method, the only way to create one of these is to read it with readMessage() (i.e., it came from some other router) As of 0.8.12 this class is working. It is used at the IBGW to reduce the processing required. For zero-hop IB tunnels, the convert() method is used to reconstitute a standard message class.
    Since:
    0.7.12 but broken before 0.8.12
    • Constructor Detail

      • UnknownI2NPMessage

        public UnknownI2NPMessage​(I2PAppContext context,
                                  int type)
        Parameters:
        type - 0-255
    • Method Detail

      • readMessage

        public void readMessage​(byte[] data,
                                int offset,
                                int dataSize,
                                int type)
                         throws I2NPMessageException
        Description copied from interface: I2NPMessage
        Read the body into the data structures, after the initial type byte and the uniqueId / expiration, using the current class's format as defined by the I2NP specification
        Parameters:
        data - data to read from
        offset - where to start in the data array
        dataSize - how long into the data to read
        type - I2NP message type
        Throws:
        IllegalStateException - if data previously set, to protect saved checksum
        I2NPMessageException - if the stream doesn't contain a valid message that this class can read.
      • calculateWrittenLength

        protected int calculateWrittenLength()
        calculate the message body's length (not including the header and footer
        Specified by:
        calculateWrittenLength in class I2NPMessageImpl
      • writeMessageBody

        protected int writeMessageBody​(byte[] out,
                                       int curIndex)
        write the message body to the output array, starting at the given index
        Specified by:
        writeMessageBody in class I2NPMessageImpl
        Returns:
        the index into the array after the last byte written (NOT the length)
      • getType

        public int getType()
        Note that this returns the "true" type, so that the IBGW can correctly make drop decisions.
        Returns:
        0-255
      • convert

        public I2NPMessage convert()
                            throws I2NPMessageException
        Attempt to convert this message to a known message class. This does the delayed verification using the saved checksum. Used by TunnelGatewayZeroHop.
        Throws:
        I2NPMessageException - if the conversion fails
        Since:
        0.8.12
      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class Object