Class HopProcessor

java.lang.Object
net.i2p.router.tunnel.HopProcessor
Direct Known Subclasses:
InboundGatewayProcessor

class HopProcessor extends Object
Take a received tunnel message, verify that it isn't a duplicate, and translate it into what the next hop will want. The hop processor works the same on all peers - inbound and outbound participants, outbound endpoints, and inbound gateways (with a small modification per InboundGatewayProcessor).
  • Field Details

    • _context

      protected final I2PAppContext _context
    • _config

      protected final HopConfig _config
    • IV_LENGTH

      static final int IV_LENGTH
      as of i2p 0.6, the tunnel crypto changed to encrypt the IV both before and after using it at each hop so as to prevent a certain type of replay/confirmation attack. See: http://osdir.com/ml/network.i2p/2005-07/msg00031.html
      See Also:
  • Constructor Details

  • Method Details

    • process

      public boolean process(byte[] orig, int offset, int length, Hash prev)
      Process the data for the current hop, overwriting the original data with what should be sent to the next peer. This also validates the previous peer and the IV, making sure its not a repeat and not a loop.
      Parameters:
      orig - IV+data of the message
      offset - index into orig where the IV begins
      length - how long after the offset does the IV+message go for? Should always be 1024 bytes.
      prev - previous hop in the tunnel, or null if we are the gateway
      Returns:
      true if the message was updated and valid, false if it was not.
    • toString

      public String toString()
      Overrides:
      toString in class Object
      Since:
      0.8.12