java.lang.Object
net.i2p.router.transport.udp.IPThrottler
class IPThrottlerextends Object
Throttles connection attempts by IP address to prevent abuse. Counts and limits requests from individual IPs within a time window. Supports both IPv4 (direct IP) and IPv6 (hashed first 8 bytes) addresses.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    private class 
    IPThrottler.Cleaner
    Decays the per-IP counts on a schedule.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private final long
    _cleanTime
    How often the counts are decayed, in ms.
    private ObjectCounter<Integer>
    _counter
    Recent messages counted per IP address.
    private final int
    _max
    Most messages allowed from one IP in a window.

  • Constructor Summary

    Constructors
    Constructor
    Description
    IPThrottler(int max, long time)
    Create an IP throttler.

  • Method Summary

    Modifier and Type
    Method
    Description
    private static Integer
    hashCode(byte[] ip)
    Hash an IP address for throttling.
    boolean
    shouldThrottle(byte[] ip)
    Increments before checking.
    private static Integer
    toInt(byte[] ip)
    Reduces an IP address to a map key.

    Methods inherited from class Object

    clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • _counter

      private ObjectCounter<Integer> _counter
      Recent messages counted per IP address.

    • _max

      private final int _max
      Most messages allowed from one IP in a window.

    • _cleanTime

      private final long _cleanTime
      How often the counts are decayed, in ms.

  • Constructor Details

    • IPThrottler

      public IPThrottler(int max, long time)
      Create an IP throttler.
      Parameters:
      max - the maximum count before throttling
      time - the cleanup interval in ms

  • Method Details

    • shouldThrottle

      public boolean shouldThrottle(byte[] ip)
      Increments before checking.
      Parameters:
      ip - the IP address bytes
      Returns:
      true if the IP should be throttled

    • toInt

      private static Integer toInt(byte[] ip)
      Reduces an IP address to a map key.
      Parameters:
      ip - the address bytes
      Returns:
      the key for that address

    • hashCode

      private static Integer hashCode(byte[] ip)
      Hash an IP address for throttling.
      Parameters:
      ip - the raw address bytes, at least 8 bytes long
      Returns:
      the hash value used as the throttle map key