java.lang.Object
net.i2p.router.tunnel.pool.BuildMessageProcessor
class BuildMessageProcessorextends Object
Receive the build message at a certain hop, decrypt its encrypted record, read the enclosed tunnel request, decide how to reply, write the reply, encrypt the reply record, and return a TunnelBuildMessage to forward on to the next hop.

There is only one of these. Instantiated by BuildHandler.

  • Field Details

    • ctx

      private final RouterContext ctx
      The router context the builds happen in.

    • log

      private final Log log
      Logger for this class.

    • _filter

      private final DecayingBloomFilter _filter
      Build ids already seen, to drop duplicates.

  • Constructor Details

    • BuildMessageProcessor

      public BuildMessageProcessor(RouterContext ctx)
      Creates a new BuildMessageProcessor.
      Parameters:
      ctx - the router context

  • Method Details

    • selectFilter

      private DecayingBloomFilter selectFilter()
      For N typical part tunnels and rejecting 50%, that's 12N requests per hour. This is the equivalent of (12N/600) KBps through the IVValidator filter.

      Target false positive rate is 1E-5 or lower.

      Returns:
      the IV filter sized for this router's memory and tunnel count

    • decrypt

      public BuildRequestRecord decrypt(TunnelBuildMessage msg, Hash ourHash, PrivateKey privKey)
      Decrypt the record targeting us, encrypting all of the other records with the included reply key and IV. The original, encrypted record targeting us is removed from the request message (so that the reply can be placed in that position after going through the decrypted request record).

      Note that this layer-decrypts the build records in-place. Do not call this more than once for a given message.

      Parameters:
      msg - the tunnel build message
      ourHash - our router hash
      privKey - our private key
      Returns:
      the current hop's decrypted record or null on failure