Package net.i2p.client

Interface I2PSession

  • All Known Implementing Classes:
    I2PSessionImpl, I2PSessionImpl2, I2PSessionMuxedImpl, I2PSimpleSession, SubSession
    public interface I2PSession

    Define the standard means of sending and receiving messages on the I2P network by using the I2CP (the client protocol). This is done over a bidirectional TCP socket. End to end encryption in I2PSession was disabled in release 0.6. Periodically the router will ask the client to authorize a new set of tunnels to be allocated to the client, which the client can accept by sending a LeaseSet signed by the Destination. In addition, the router may on occasion provide the client with an updated clock offset so that the client can stay in sync with the network (even if the host computer's clock is off).

    • Method Detail

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload)
             throws I2PSessionException
        Send a new message to the given destination, containing the specified payload, returning true if the router feels confident that the message was delivered. WARNING: It is recommended that you use a method that specifies the protocol and ports.
        Parameters:
        dest - location to send the message
        payload - body of the message to be sent (unencrypted)
        Returns:
        whether it was accepted by the router for delivery or not
        Throws:
        I2PSessionException

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    int offset,
                    int size)
             throws I2PSessionException
        Send a new message to the given destination, containing the specified payload, returning true if the router feels confident that the message was delivered. WARNING: It is recommended that you use a method that specifies the protocol and ports.
        Parameters:
        dest - location to send the message
        payload - body of the message to be sent (unencrypted)
        Returns:
        success
        Throws:
        I2PSessionException

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    int proto,
                    int fromport,
                    int toport)
             throws I2PSessionException
        See I2PSessionMuxedImpl for proto/port details.
        Returns:
        success
        Throws:
        I2PSessionException
        Since:
        0.7.1

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    SessionKey keyUsed,
                    Set<SessionTag> tagsSent)
             throws I2PSessionException
        End-to-End Crypto is disabled, tags and keys are ignored! Like sendMessage above, except the key used and the tags sent are exposed to the application.

        If some application layer message delivery confirmation is used, rather than i2p's (slow) built in confirmation via guaranteed delivery mode, the application can update the SessionKeyManager, ala: 

           SessionKeyManager.getInstance().tagsDelivered(dest.getPublicKey(), keyUsed, tagsSent);
        If an application is using guaranteed delivery mode, this is not useful, but for applications using best effort delivery mode, if they can know with certainty that a message was delivered and can update the SessionKeyManager appropriately, a significant performance boost will occur (subsequent message encryption and decryption will be done via AES and a SessionTag, rather than ElGamal+AES, which is 1000x slower).
        Parameters:
        dest - location to send the message
        payload - body of the message to be sent (unencrypted)
        keyUsed - UNUSED, IGNORED. Session key delivered to the destination for association with the tags sent. This is essentially an output parameter - keyUsed.getData() is ignored during this call, but after the call completes, it will be filled with the bytes of the session key delivered. Typically the key delivered is the same one as the key encrypted with, but not always. If this is null then the key data will not be exposed.
        tagsSent - UNUSED, IGNORED. Set of tags delivered to the peer and associated with the keyUsed. This is also an output parameter - the contents of the set is ignored during the call, but afterwards it contains a set of SessionTag objects that were sent along side the given keyUsed.
        Returns:
        success
        Throws:
        I2PSessionException

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    int offset,
                    int size,
                    SessionKey keyUsed,
                    Set<SessionTag> tagsSent,
                    long expire)
             throws I2PSessionException
        End-to-End Crypto is disabled, tags and keys are ignored.
        Parameters:
        keyUsed - UNUSED, IGNORED.
        tagsSent - UNUSED, IGNORED.
        expire - absolute expiration timestamp, NOT interval from now
        Returns:
        success
        Throws:
        I2PSessionException
        Since:
        0.7.1

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    int offset,
                    int size,
                    SessionKey keyUsed,
                    Set<SessionTag> tagsSent,
                    int proto,
                    int fromPort,
                    int toPort)
             throws I2PSessionException
        See I2PSessionMuxedImpl for proto/port details. End-to-End Crypto is disabled, tags and keys are ignored.
        Parameters:
        keyUsed - UNUSED, IGNORED.
        tagsSent - UNUSED, IGNORED.
        proto - 1-254 or 0 for unset; recommended: I2PSession.PROTO_UNSPECIFIED I2PSession.PROTO_STREAMING I2PSession.PROTO_DATAGRAM 255 disallowed
        fromPort - 1-65535 or 0 for unset
        toPort - 1-65535 or 0 for unset
        Returns:
        success
        Throws:
        I2PSessionException
        Since:
        0.7.1

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    int offset,
                    int size,
                    SessionKey keyUsed,
                    Set<SessionTag> tagsSent,
                    long expire,
                    int proto,
                    int fromPort,
                    int toPort)
             throws I2PSessionException
        See I2PSessionMuxedImpl for proto/port details. End-to-End Crypto is disabled, tags and keys are ignored.
        Parameters:
        keyUsed - UNUSED, IGNORED.
        tagsSent - UNUSED, IGNORED.
        expire - absolute expiration timestamp, NOT interval from now
        proto - 1-254 or 0 for unset; recommended: I2PSession.PROTO_UNSPECIFIED I2PSession.PROTO_STREAMING I2PSession.PROTO_DATAGRAM 255 disallowed
        fromPort - 1-65535 or 0 for unset
        toPort - 1-65535 or 0 for unset
        Returns:
        success
        Throws:
        I2PSessionException
        Since:
        0.7.1

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    int offset,
                    int size,
                    SessionKey keyUsed,
                    Set<SessionTag> tagsSent,
                    long expire,
                    int proto,
                    int fromPort,
                    int toPort,
                    int flags)
             throws I2PSessionException
        See I2PSessionMuxedImpl for proto/port details. End-to-End Crypto is disabled, tags and keys are ignored.
        Parameters:
        keyUsed - UNUSED, IGNORED.
        tagsSent - UNUSED, IGNORED.
        expire - absolute expiration timestamp, NOT interval from now
        proto - 1-254 or 0 for unset; recommended: I2PSession.PROTO_UNSPECIFIED I2PSession.PROTO_STREAMING I2PSession.PROTO_DATAGRAM 255 disallowed
        fromPort - 1-65535 or 0 for unset
        toPort - 1-65535 or 0 for unset
        Returns:
        success
        Throws:
        I2PSessionException
        Since:
        0.8.4

      • sendMessage

        boolean sendMessage​(Destination dest,
                    byte[] payload,
                    int offset,
                    int size,
                    int proto,
                    int fromPort,
                    int toPort,
                    SendMessageOptions options)
             throws I2PSessionException
        See I2PSessionMuxedImpl for proto/port details. See SendMessageOptions for option details.
        Parameters:
        proto - 1-254 or 0 for unset; recommended: I2PSession.PROTO_UNSPECIFIED I2PSession.PROTO_STREAMING I2PSession.PROTO_DATAGRAM 255 disallowed
        fromPort - 1-65535 or 0 for unset
        toPort - 1-65535 or 0 for unset
        options - to be passed to the router
        Returns:
        success
        Throws:
        I2PSessionException
        Since:
        0.9.2

      • sendMessage

        long sendMessage​(Destination dest,
                 byte[] payload,
                 int offset,
                 int size,
                 int proto,
                 int fromPort,
                 int toPort,
                 SendMessageOptions options,
                 SendMessageStatusListener listener)
          throws I2PSessionException
        Send a message and request an asynchronous notification of delivery status. Notifications will be delivered at least up to the expiration specified in the options, or 60 seconds if not specified. See I2PSessionMuxedImpl for proto/port details. See SendMessageOptions for option details.
        Parameters:
        proto - 1-254 or 0 for unset; recommended: I2PSession.PROTO_UNSPECIFIED I2PSession.PROTO_STREAMING I2PSession.PROTO_DATAGRAM 255 disallowed
        fromPort - 1-65535 or 0 for unset
        toPort - 1-65535 or 0 for unset
        options - to be passed to the router
        Returns:
        the message ID to be used for later notification to the listener
        Throws:
        I2PSessionException - on all errors
        Since:
        0.9.14

      • receiveMessage

        byte[] receiveMessage​(int msgId)
               throws I2PSessionException
        Receive a message that the router has notified the client about, returning the payload. This may only be called once for a given msgId (until the counter wraps)
        Parameters:
        msgId - message to fetch
        Returns:
        unencrypted body of the message, or null if not found
        Throws:
        I2PSessionException

      • reportAbuse

        void reportAbuse​(int msgId,
                 int severity)
          throws I2PSessionException
        Instruct the router that the message received was abusive (including how abusive on a 1-100 scale) in the hopes the router can do something to minimize receiving abusive messages like that in the future. Unused. Not fully implemented.
        Parameters:
        msgId - message that was abusive (or -1 for not message related)
        severity - how abusive
        Throws:
        I2PSessionException

      • setSessionListener

        void setSessionListener​(I2PSessionListener lsnr)
        Instruct the I2PSession where it should send event notifications WARNING: It is recommended that you use a method that specifies the protocol and ports.
        Parameters:
        lsnr - listener to retrieve events

      • addSubsession

        I2PSession addSubsession​(InputStream privateKeyStream,
                         Properties opts)
                  throws I2PSessionException
        Parameters:
        privateKeyStream - null for transient, if non-null must have same encryption keys as primary session and different signing keys
        opts - subsession options if any, may be null
        Returns:
        a new subsession, non-null
        Throws:
        I2PSessionException
        Since:
        0.9.21

      • removeSubsession

        void removeSubsession​(I2PSession session)
        Since:
        0.9.21

      • getSubsessions

        List<I2PSession> getSubsessions()
        Returns:
        a list of subsessions, non-null, does not include the primary session
        Since:
        0.9.21

      • connect

        void connect()
      throws I2PSessionException
        Actually connect the session and start receiving/sending messages. Connecting a primary session will not automatically connect subsessions. Connecting a subsession will automatically connect the primary session if not previously connected.
        Throws:
        I2PSessionException

      • isClosed

        boolean isClosed()
        Have we closed the session?
        Returns:
        true if the session is closed, OR connect() has not been called yet

      • getMyDestination

        Destination getMyDestination()
        Retrieve the Destination this session serves as the endpoint for. Returns null if no destination is available.

      • getDecryptionKey

        PrivateKey getDecryptionKey()
        Retrieve the decryption PrivateKey associated with the Destination

      • getPrivateKey

        SigningPrivateKey getPrivateKey()
        Retrieve the signing SigningPrivateKey associated with the Destination. As of 0.9.38, this will be the transient key if offline signed.

      • isOffline

        boolean isOffline()
        Does this session have offline and transient keys?
        Since:
        0.9.38

      • getOfflineExpiration

        long getOfflineExpiration()
        Get the offline expiration
        Returns:
        Java time (ms) or 0 if not initialized or does not have offline keys
        Since:
        0.9.38

      • getOfflineSignature

        Signature getOfflineSignature()
        Returns:
        null on error or if not initialized or does not have offline keys
        Since:
        0.9.38

      • getTransientSigningPublicKey

        SigningPublicKey getTransientSigningPublicKey()
        Returns:
        null on error or if not initialized or does not have offline keys
        Since:
        0.9.38

      • lookupDest

        Destination lookupDest​(String name)
                throws I2PSessionException
        Ask the router to lookup a Destination by hostname. Blocking. Waits a max of 10 seconds by default. This only makes sense for a b32 address, OR outside router context. Inside router context, just query the naming service. Outside router context, this does NOT query the context naming service. Do that first if you expect a local addressbook. This will log a warning for non-b32 in router context. Suggested implementation: 
          if (name.length() == 60 && name.toLowerCase(Locale.US).endsWith(".b32.i2p")) {
      if (session != null)
          return session.lookup(Hash.create(Base32.decode(name.toLowerCase(Locale.US).substring(0, 52))));
      else
          return ctx.namingService().lookup(name); // simple session for xxx.b32.i2p handled by naming service (optional if you need lookup w/o an existing session)
  } else if (ctx.isRouterContext()) {
      return ctx.namingService().lookup(name); // hostname from router's naming service
  } else {
      Destination d = ctx.namingService().lookup(name); // local naming svc, optional
      if (d != null)
          return d;
      if (session != null)
          return session.lookup(name);
      // simple session (optional if you need lookup w/o an existing session)
      Destination rv = null;
      I2PClient client = new I2PSimpleClient();
      Properties opts = new Properties();
      opts.put(I2PClient.PROP_TCP_HOST, host);
      opts.put(I2PClient.PROP_TCP_PORT, port);
      I2PSession session = null;
      try {
          session = client.createSession(null, opts);
          session.connect();
          rv = session.lookupDest(name);
      } finally {
          if (session != null)
              session.destroySession();
      }
      return rv;
  }
        Requires router side to be 0.9.11 or higher. If the router is older, this will return null immediately.
        Throws:
        I2PSessionException
        Since:
        0.9.11

      • lookupDest2

        LookupResult lookupDest2​(String name,
                         long maxWait)
                  throws I2PSessionException
        Ask the router to lookup a Destination by hostname. Blocking. See above for details. Same as lookupDest() but with a failure code in the return value
        Parameters:
        maxWait - ms
        Returns:
        non-null
        Throws:
        I2PSessionException
        Since:
        0.9.43

      • updateOptions

        void updateOptions​(Properties options)
        Pass updated options to the router. Does not remove properties previously present but missing from this options parameter. Fails silently if session is not connected.
        Parameters:
        options - non-null
        Since:
        0.8.4

      • getRouterVersion

        String getRouterVersion()
        Always valid in RouterContext. Returns null if not yet connected in I2PAppContext.
        Returns:
        null if unknown
        Since:
        0.9.46

      • addSessionListener

        void addSessionListener​(I2PSessionListener lsnr,
                        int proto,
                        int port)
        Listen on specified protocol and port. An existing listener with the same proto and port is replaced. Only the listener with the best match is called back for each message.
        Parameters:
        proto - 1-254 or PROTO_ANY (0) for all; recommended: I2PSession.PROTO_STREAMING I2PSession.PROTO_DATAGRAM 255 disallowed
        port - 1-65535 or PORT_ANY (0) for all
        Since:
        0.7.1

      • addMuxedSessionListener

        void addMuxedSessionListener​(I2PSessionMuxedListener l,
                             int proto,
                             int port)
        Listen on specified protocol and port, and receive notification of proto, fromPort, and toPort for every message.
        Parameters:
        proto - 1-254 or PROTO_ANY (0) for all; 255 disallowed
        port - 1-65535 or PORT_ANY (0) for all
        Since:
        0.7.1

      • removeListener

        void removeListener​(int proto,
                    int port)
        removes the specified listener (only)
        Since:
        0.7.1