/*
This file is part of GNUnet.
- (C) 2009 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2009-2016 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
- * @file include/gnunet_transport_service.h
- * @brief low-level P2P IO
* @author Christian Grothoff
+ *
+ * @file
+ * Low-level P2P IO
+ *
+ * @defgroup transport Transport service
+ * Low-level P2P IO
+ *
+ * @see [Documentation](https://gnunet.org/transport-service)
+ *
+ * @{
*/
#ifndef GNUNET_TRANSPORT_SERVICE_H
#endif
#endif
-#include "gnunet_bandwidth_lib.h"
-#include "gnunet_configuration_lib.h"
-#include "gnunet_crypto_lib.h"
-#include "gnunet_connection_lib.h"
-#include "gnunet_scheduler_lib.h"
-#include "gnunet_time_lib.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_ats_service.h"
/**
* Version number of the transport API.
*/
-#define GNUNET_TRANSPORT_VERSION 0x00000000
+#define GNUNET_TRANSPORT_VERSION 0x00000003
+
+
+/* *************************** HELLO *************************** */
+
+/**
+ * Handle for a #GNUNET_TRANSPORT_offer_hello operation
+ */
+struct GNUNET_TRANSPORT_OfferHelloHandle;
/**
- * Enum defining all known property types for ATS Enum values are used
- * in the GNUNET_TRANSPORT_ATS_Information struct as
- * (key,value)-pairs.
+ * Offer the transport service the HELLO of another peer. Note that
+ * the transport service may just ignore this message if the HELLO is
+ * malformed or useless due to our local configuration.
*
- * Cost are always stored in uint32_t, so all units used to define costs
- * have to be normalized to fit in uint32_t [0 .. 4.294.967.295]
+ * @param cfg configuration
+ * @param hello the hello message
+ * @param cont continuation to call when HELLO has been sent,
+ * tc reason #GNUNET_SCHEDULER_REASON_TIMEOUT for fail
+ * tc reasong #GNUNET_SCHEDULER_REASON_READ_READY for success
+ * @param cont_cls closure for @a cont
+ * @return a `struct GNUNET_TRANSPORT_OfferHelloHandle` handle or NULL on failure,
+ * in case of failure @a cont will not be called
*
- * To keep the elements ordered
- * 1..1024 : Values with a relation to cost
- * 1025..2048 : Values with a relation to quality
- * 2049..3072 : Values with a relation to availability
+ */
+struct GNUNET_TRANSPORT_OfferHelloHandle *
+GNUNET_TRANSPORT_offer_hello (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_MessageHeader *hello,
+ GNUNET_SCHEDULER_TaskCallback cont,
+ void *cont_cls);
+
+
+/**
+ * Cancel the request to transport to offer the HELLO message
*
+ * @param ohh the `struct GNUNET_TRANSPORT_OfferHelloHandle` to cancel
*/
-enum GNUNET_TRANSPORT_ATS_Property
-{
+void
+GNUNET_TRANSPORT_offer_hello_cancel (struct GNUNET_TRANSPORT_OfferHelloHandle *ohh);
- /**
- * End of the array.
- */
- GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR = 0,
- /* Cost related values */
- /* =================== */
+/* *********************** Address to String ******************* */
- /**
- * Volume based cost in financial units to transmit data
- *
- * Note: This value is not bound to a specific currency or unit and only
- * used locally.
- * "cent" just refers the smallest amount of money in the respective
- * currency.
- *
- * Unit: [cent/MB]
- *
- * Interpretation: less is better
- *
- * Examples:
- * LAN: 0 [cent/MB]
- * 2G : 10 [cent/MB]
- */
- GNUNET_TRANSPORT_ATS_COST_FINANCIAL_PER_VOLUME = 1,
+/**
+ * Handle to cancel a pending address lookup.
+ */
+struct GNUNET_TRANSPORT_AddressToStringContext;
- /**
- * Time based cost in financial units to transmit data
- *
- * Note: This value is not bound to a specific currency or unit and only
- * used locally.
- * "cent" just refers the smallest amount of money in the respective
- * currency.
- *
- * Unit: [cent/h]
- *
- * Interpretation: less is better
- *
- * Examples:
- * LAN : 0 [cent/h]
- * Dialup: 10 [cent/h]
- */
- GNUNET_TRANSPORT_ATS_COST_FINANCIAL_PER_TIME = 2,
- /**
- * Computational costs
- *
- * Effort of preparing data to be sent with this transport
- * Includes encoding, encryption and conversion of data
- * Partial values can be summed up: c_sum = c_enc + c_enc + c_conv
- * Resulting values depend on local system properties, e.g. CPU
- *
- * Unit: [ms/GB]
- *
- * Interpretation: less is better
- *
- * Examples:
- *
- * HTTPS with AES CBC-256: 7,382
- * HTTPS with AES CBC-128: 5,279
- * HTTPS with RC4-1024: 2,652
- */
- GNUNET_TRANSPORT_ATS_COST_COMPUTATIONAL = 3,
+/**
+ * Function to call with a textual representation of an address. This
+ * function will be called several times with different possible
+ * textual representations, and a last time with @a address being NULL
+ * to signal the end of the iteration. Note that @a address NULL
+ * always is the last call, regardless of the value in @a res.
+ *
+ * @param cls closure
+ * @param address NULL on end of iteration,
+ * otherwise 0-terminated printable UTF-8 string,
+ * in particular an empty string if @a res is #GNUNET_NO
+ * @param res result of the address to string conversion:
+ * if #GNUNET_OK: conversion successful
+ * if #GNUNET_NO: address was invalid (or not supported)
+ * if #GNUNET_SYSERR: communication error (IPC error)
+ */
+typedef void
+(*GNUNET_TRANSPORT_AddressToStringCallback) (void *cls,
+ const char *address,
+ int res);
- /**
- * Energy consumption
- *
- * Energy consumption using this transport when sending with a certain
- * power at a certain bitrate. This is only an approximation based on:
- * Energy consumption E = P / D
- *
- * with:
- * Power P in Watt (J/s)
- * Datarate D in MBit/s
- *
- * Conversion between power P and dBm used by WLAN in radiotap's dBm TX power:
- *
- * Lp(dbm) = 10 log10 (P/ 1mW)
- *
- * => P = 1 mW * 10^(Lp(dbm)/10)
- *
- * Unit: [mJ/MB]
- *
- * Interpretation: less is better
- *
- * Examples:
- *
- * LAN: 0
- * WLAN: 89 (600 mW @ 802.11g /w 54 MBit/s)
- * Bluetooth: 267 (100 mW @ BT2.0 EDR /w 3 MBit/s)
- */
- GNUNET_TRANSPORT_ATS_COST_ENERGY_CONSUMPTION = 4,
- /**
- * Connect cost
- * How many bytes are transmitted to initiate a new connection using
- * this transport?
- *
- * Unit: [bytes]
- *
- * Interpretation: less is better
- *
- * Examples:
- *
- * UDP (No connection) :
- * 0 bytes
- * TCP (TCP 3-Way handshake):
- * 220 bytes Ethernet, 172 bytes TCP/IP, 122 bytes TCP
- * HTTP (TCP + Header) :
- * 477 bytes Ethernet, 429 bytes TCP/IP, 374 bytes TCP, 278 bytes HTTP
- * HTTPS HTTP+TLS Handshake:
- * 2129 bytes Ethernet, 1975 bytes TCP/IP, 1755 bytes TCP, 1403 bytes HTTPS
- *
- * */
- GNUNET_TRANSPORT_ATS_COST_CONNECT = 5,
+/**
+ * Convert a binary address into a human readable address.
+ *
+ * @param cfg configuration to use
+ * @param address address to convert (binary format)
+ * @param numeric should (IP) addresses be displayed in numeric form
+ * (otherwise do reverse DNS lookup)
+ * @param timeout how long is the lookup allowed to take at most
+ * @param aluc function to call with the results
+ * @param aluc_cls closure for @a aluc
+ * @return handle to cancel the operation, NULL on error
+ */
+struct GNUNET_TRANSPORT_AddressToStringContext *
+GNUNET_TRANSPORT_address_to_string (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_HELLO_Address *address,
+ int numeric,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_TRANSPORT_AddressToStringCallback aluc,
+ void *aluc_cls);
- /**
- * Bandwidth cost
- *
- * How many bandwidth is available to consume?
- * Used to calculate which impact sending data with this transport has
- *
- * Unit: [kB/s]
- *
- * Interpretation: more is better
- *
- * Examples:
- * LAN: 12,800 (100 MBit/s)
- * WLAN: 6,912 (54 MBit/s)
- * Dial-up: 8 (64 Kbit/s)
- *
- */
- GNUNET_TRANSPORT_ATS_COST_BANDWITH_AVAILABLE = 6,
- /**
- * Network overhead
- *
- * How many bytes are sent over the wire when 1 kilobyte (1024 bytes)
- * of application data is transmitted?
- * A factor used with connect cost, bandwidth cost and energy cost
- * to describe the overhead produced by the transport protocol
- *
- * Unit: [bytes/kb]
- *
- * Interpretation: less is better
- *
- * Examples:
- *
- * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
- * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
- * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
- * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
- */
- GNUNET_TRANSPORT_ATS_COST_NETWORK_OVERHEAD = 7,
+/**
+ * Cancel request for address conversion.
+ *
+ * @param alc the context handle
+ */
+void
+GNUNET_TRANSPORT_address_to_string_cancel (struct GNUNET_TRANSPORT_AddressToStringContext *alc);
- /* Quality related values */
- /* ====================== */
+/* *********************** Monitoring ************************** */
- /* Physical layer quality properties */
+/**
+ * Possible state of a neighbour. Initially, we are #GNUNET_TRANSPORT_PS_NOT_CONNECTED.
+ *
+ * Then, there are two main paths. If we receive a SYN message, we give
+ * the inbound address to ATS. After the check we ask ATS for a suggestion
+ * (#GNUNET_TRANSPORT_PS_CONNECT_RECV_ATS). If ATS makes a suggestion, we
+ * send our SYN_ACK and go to #GNUNET_TRANSPORT_PS_CONNECT_RECV_ACK.
+ * If we receive a ACK, we go to #GNUNET_TRANSPORT_PS_CONNECTED
+ * (and notify everyone about the new connection). If the operation times out,
+ * we go to #GNUNET_TRANSPORT_PS_DISCONNECT.
+ *
+ * The other case is where we transmit a SYN message first. We
+ * start with #GNUNET_TRANSPORT_PS_INIT_ATS. If we get an address, we send
+ * the SYN message and go to state #GNUNET_TRANSPORT_PS_CONNECT_SENT.
+ * Once we receive a SYN_ACK, we go to #GNUNET_TRANSPORT_PS_CONNECTED
+ * (and notify everyone about the new connection and send
+ * back a ACK). If the operation times out, we go to
+ * #GNUNET_TRANSPORT_PS_DISCONNECT.
+ *
+ * If the session is in trouble (i.e. transport-level disconnect or
+ * timeout), we go to #GNUNET_TRANSPORT_PS_RECONNECT_ATS where we ask ATS for a new
+ * address (we don't notify anyone about the disconnect yet). Once we
+ * have a new address, we enter #GNUNET_TRANSPORT_PS_RECONNECT_SENT and send a
+ * SYN message. If we receive a
+ * SYN_ACK, we go to #GNUNET_TRANSPORT_PS_CONNECTED and nobody noticed that we had
+ * trouble; we also send a ACK at this time just in case. If
+ * the operation times out, we go to #GNUNET_TRANSPORT_PS_DISCONNECT (and notify everyone
+ * about the lost connection).
+ *
+ * If ATS decides to switch addresses while we have a normal
+ * connection, we go to #GNUNET_TRANSPORT_PS_CONNECTED_SWITCHING_SYN_SENT
+ * and send a SESSION_CONNECT. If we get a ACK back, we switch the
+ * primary connection to the suggested alternative from ATS, go back
+ * to #GNUNET_TRANSPORT_PS_CONNECTED and send a ACK to the other peer just to be
+ * sure. If the operation times out
+ * we go to #GNUNET_TRANSPORT_PS_CONNECTED (and notify ATS that the given alternative
+ * address is "invalid").
+ *
+ * Once a session is in #GNUNET_TRANSPORT_PS_DISCONNECT, it is cleaned up and then goes
+ * to (#GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED). If we receive an explicit disconnect
+ * request, we can go from any state to #GNUNET_TRANSPORT_PS_DISCONNECT, possibly after
+ * generating disconnect notifications.
+ *
+ * Note that it is quite possible that while we are in any of these
+ * states, we could receive a 'SYN' request from the other peer.
+ * We then enter a 'weird' state where we pursue our own primary state
+ * machine (as described above), but with the 'send_connect_ack' flag
+ * set to 1. If our state machine allows us to send a 'SYN_ACK'
+ * (because we have an acceptable address), we send the 'SYN_ACK'
+ * and set the 'send_connect_ack' to 2. If we then receive a
+ * 'ACK', we go to #GNUNET_TRANSPORT_PS_CONNECTED (and reset 'send_connect_ack'
+ * to 0).
+ *
+ */
+enum GNUNET_TRANSPORT_PeerState
+{
/**
- * Signal strength on physical layer
- *
- * Unit: [dBm]
+ * Fresh peer or completely disconnected
*/
- GNUNET_TRANSPORT_ATS_QUALITY_PHY_SIGNAL_STRENGTH = 1025,
+ GNUNET_TRANSPORT_PS_NOT_CONNECTED = 0,
/**
- * Collision rate on physical layer
- *
- * Unit: [B/s]
+ * Asked to initiate connection, trying to get address from ATS
*/
- GNUNET_TRANSPORT_ATS_QUALITY_PHY_COLLISION_RATE = 1026,
+ GNUNET_TRANSPORT_PS_INIT_ATS,
/**
- * Error rate on physical layer
- *
- * Unit: [B/s]
+ * Sent SYN message to other peer, waiting for SYN_ACK
*/
- GNUNET_TRANSPORT_ATS_QUALITY_PHY_ERROR_RATE = 1027,
-
- /* Network layer quality properties */
+ GNUNET_TRANSPORT_PS_SYN_SENT,
/**
- * Delay
- * Time between when the time packet is sent and the packet arrives
- *
- * Unit: [ms]
- *
- * Examples:
- *
- * LAN : 1
- * WLAN : 2
- * Dialup: 500
+ * Received a SYN, asking ATS about address suggestions.
*/
- GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY = 1028,
+ GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
/**
- * Jitter
- * Time variations of the delay
- * 1st derivative of a delay function
- *
- * Unit: [ms]
+ * SYN request from other peer was SYN_ACK'ed, waiting for ACK.
*/
- GNUNET_TRANSPORT_ATS_QUALITY_NET_JITTER = 1029,
+ GNUNET_TRANSPORT_PS_SYN_RECV_ACK,
/**
- * Error rate on network layer
- *
- * Unit: [B/s]
- *
- * Examples:
- *
- * LAN : 0
- * WLAN : 400
- * Bluetooth : 100
- * Note: This numbers are just assumptions as an example, not
- * measured or somehow determined
+ * Got our SYN_ACK/ACK, connection is up.
*/
- GNUNET_TRANSPORT_ATS_QUALITY_NET_ERRORRATE = 1030,
+ GNUNET_TRANSPORT_PS_CONNECTED,
/**
- * Drop rate on network layer
- * Bytes actively dismissed by a network component during transmission
- * Reasons for dropped data can be full queues, congestion, quota violations...
- *
- * Unit: [B/s]
- *
- * Examples:
- *
- * LAN : 0
- * WLAN : 400
- * Bluetooth : 100
- * Note: This numbers are just assumptions as an example, not
- * measured or somehow determined
+ * Connection got into trouble, rest of the system still believes
+ * it to be up, but we're getting a new address from ATS.
*/
- GNUNET_TRANSPORT_ATS_QUALITY_NET_DROPRATE = 1031,
+ GNUNET_TRANSPORT_PS_RECONNECT_ATS,
/**
- * Loss rate on network layer
- * Bytes lost during transmission
- * Reasons can be collisions, ...
- *
- * Unit: [B/s]
- *
- * Examples:
- *
- * LAN : 0
- * WLAN : 40
- * Bluetooth : 10
- * Note: This numbers are just assumptions as an example, not measured
- * or somehow determined
+ * Sent SYN over new address (either by ATS telling us to switch
+ * addresses or from RECONNECT_ATS); if this fails, we need to tell
+ * the rest of the system about a disconnect.
*/
- GNUNET_TRANSPORT_ATS_QUALITY_NET_LOSSRATE = 1032,
+ GNUNET_TRANSPORT_PS_RECONNECT_SENT,
/**
- * Throughput on network layer
- *
- * Unit: [kB/s]
- *
- * Examples:
- *
- * LAN : 3400
- * WLAN : 1200
- * Dialup: 4
- *
+ * We have some primary connection, but ATS suggested we switch
+ * to some alternative; we now sent a SYN message for the
+ * alternative session to the other peer and waiting for a
+ * SYN_ACK to make this our primary connection.
*/
- GNUNET_TRANSPORT_ATS_QUALITY_NET_THROUGHPUT = 1033,
-
- /**
- * Distance on network layer
- *
- * Unit: []
- */
- GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE = 1034,
-
-
- /* Availability related values */
- /* =========================== */
+ GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT,
/**
- * Is a peer reachable?
+ * Disconnect in progress (we're sending the DISCONNECT message to the
+ * other peer; after that is finished, the state will be cleaned up).
*/
- GNUNET_TRANSPORT_ATS_AVAILABILITY_REACHABLE = 2048,
+ GNUNET_TRANSPORT_PS_DISCONNECT,
/**
- * Is there a connection established to a peer using this transport
+ * We're finished with the disconnect; and are cleaning up the state
+ * now! We put the struct into this state when we are really in the
+ * task that calls 'free' on it and are about to remove the record
+ * from the map. We should never find a 'struct NeighbourMapEntry'
+ * in this state in the map. Accessing a 'struct NeighbourMapEntry'
+ * in this state virtually always means using memory that has been
+ * freed (the exception being the cleanup code in #free_neighbour()).
*/
- GNUNET_TRANSPORT_ATS_AVAILABILITY_CONNECTED = 2049
+ GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED
};
/**
- * struct used to communicate the transport's properties like cost and
- * quality of service as well as high-level constraints on resource
- * consumption.
- *
- * +---+
- * +-----------+ Constraints | | Plugin properties +---------+
- * | Highlevel |------------> |ATS| <------------------|Transport|
- * | Component | ATS struct | | ATS struct | Plugin |
- * +-----------+ | | +---------+
- * +---+
- *
- * This structure will be used by transport plugins to communicate
- * costs to ATS or by higher level components to tell ATS their
- * constraints. Always a pair of (GNUNET_TRANSPORT_ATS_Property,
- * uint32_t value). Value is always uint32_t, so all units used to
- * define costs have to be normalized to fit uint32_t.
+ * Convert a transport state to a human readable string.
+ *
+ * @param state the state
*/
-struct GNUNET_TRANSPORT_ATS_Information
-{
- /**
- * ATS property type, in network byte order.
- */
- uint32_t type;
-
- /**
- * ATS property value, in network byte order.
- */
- uint32_t value;
-};
-
+const char *
+GNUNET_TRANSPORT_ps2s (enum GNUNET_TRANSPORT_PeerState state);
/**
- * Function called by the transport for each received message.
+ * Check if a state is defined as connected
*
- * @param cls closure
- * @param peer (claimed) identity of the other peer
- * @param message the message
- * @param ats performance data
- * @param ats_count number of entries in ats (excluding 0-termination)
+ * @param state the state value
+ * @return #GNUNET_YES or #GNUNET_NO
*/
-typedef void (*GNUNET_TRANSPORT_ReceiveCallback) (void *cls,
- const struct
- GNUNET_PeerIdentity * peer,
- const struct
- GNUNET_MessageHeader *
- message,
- const struct
- GNUNET_TRANSPORT_ATS_Information
- * ats, uint32_t ats_count);
+int
+GNUNET_TRANSPORT_is_connected (enum GNUNET_TRANSPORT_PeerState state);
/**
- * Opaque handle to the service.
+ * Handle for a #GNUNET_TRANSPORT_monitor_peers operation.
*/
-struct GNUNET_TRANSPORT_Handle;
+struct GNUNET_TRANSPORT_PeerMonitoringContext;
/**
- * Function called to notify transport users that another
- * peer connected to us.
+ * Function to call with information about a peer
*
- * @param cls closure
- * @param peer the peer that connected
- * @param ats performance data
- * @param ats_count number of entries in ats (excluding 0-termination)
- */
-typedef void (*GNUNET_TRANSPORT_NotifyConnect) (void *cls,
- const struct GNUNET_PeerIdentity
- * peer,
- const struct
- GNUNET_TRANSPORT_ATS_Information
- * ats, uint32_t ats_count);
-
-/**
- * Function called to notify transport users that another
- * peer disconnected from us.
+ * If one_shot was set to #GNUNET_YES to iterate over all peers once,
+ * a final call with NULL for peer and address will follow when done.
+ * In this case state and timeout do not contain valid values.
*
- * @param cls closure
- * @param peer the peer that disconnected
- */
-typedef void (*GNUNET_TRANSPORT_NotifyDisconnect) (void *cls,
- const struct
- GNUNET_PeerIdentity * peer);
-
-
-/**
- * Function to call with a binary format of an address
+ * The #GNUNET_TRANSPORT_monitor_peers_cancel() call MUST not be called from
+ * within this function!
*
- * @param cls closure
- * @param address NULL on error, otherwise 0-terminated printable UTF-8 string
- */
-typedef void (*GNUNET_TRANSPORT_AddressLookUpCallback) (void *cls,
- const char *address);
-
-
-/**
- * Function to call with a binary format of an address
*
* @param cls closure
- * @param peer peer identity
- * @param transport transport plugin
- * @param addr address
- * @param addrlen address length
- */
-typedef void (*GNUNET_TRANSPORT_AddressLookUpBinaryCallback) (void *cls,
- const struct
- GNUNET_PeerIdentity
- * peer,
- const char
- *transport,
- const void *addr,
- size_t addrlen);
-
-
-/**
- * Connect to the transport service. Note that the connection may
- * complete (or fail) asynchronously.
+ * @param peer peer this update is about,
+ * NULL if this is the final last callback for a iteration operation
+ * @param address address, NULL if this is the final callback for iteration op
+ * @param state current state this peer is in
+ * @param state_timeout timeout for the current state of the peer
+ */
+typedef void
+(*GNUNET_TRANSPORT_PeerIterateCallback) (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_HELLO_Address *address,
+ enum GNUNET_TRANSPORT_PeerState state,
+ struct GNUNET_TIME_Absolute state_timeout);
+
+
+/**
+ * Return information about a specific peer or all peers currently known to
+ * transport service once or in monitoring mode. To obtain information about
+ * a specific peer, a peer identity can be passed. To obtain information about
+ * all peers currently known to transport service, NULL can be passed as peer
+ * identity.
*
- * @param cfg configuration to use
- * @param self our own identity (API should check that it matches
- * the identity found by transport), or NULL (no check)
- * @param cls closure for the callbacks
- * @param rec receive function to call
- * @param nc function to call on connect events
- * @param nd function to call on disconnect events
- * @return NULL on error
- */
-struct GNUNET_TRANSPORT_Handle *
-GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_PeerIdentity *self, void *cls,
- GNUNET_TRANSPORT_ReceiveCallback rec,
- GNUNET_TRANSPORT_NotifyConnect nc,
- GNUNET_TRANSPORT_NotifyDisconnect nd);
-
-
-/**
- * Disconnect from the transport service.
+ * For each peer, the callback is called with information about the address used
+ * to communicate with this peer, the state this peer is currently in and the
+ * the current timeout for this state.
*
- * @param handle handle returned from connect
- */
-void
-GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle);
-
-
-/**
- * Ask the transport service to establish a connection to
- * the given peer.
+ * Upon completion, the #GNUNET_TRANSPORT_PeerIterateCallback is called one
+ * more time with `NULL`. After this, the operation must no longer be
+ * explicitly canceled.
+ *
+ * The #GNUNET_TRANSPORT_monitor_peers_cancel call MUST not be called in the
+ * the peer_callback!
*
- * @param handle connection to transport service
- * @param target who we should try to connect to
+ * @param cfg configuration to use
+ * @param peer a specific peer identity to obtain information for,
+ * NULL for all peers
+ * @param one_shot #GNUNET_YES to return the current state and then end (with NULL+NULL),
+ * #GNUNET_NO to monitor peers continuously
+ * @param peer_callback function to call with the results
+ * @param peer_callback_cls closure for @a peer_callback
*/
-void
-GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target);
+struct GNUNET_TRANSPORT_PeerMonitoringContext *
+GNUNET_TRANSPORT_monitor_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PeerIdentity *peer,
+ int one_shot,
+ GNUNET_TRANSPORT_PeerIterateCallback peer_callback,
+ void *peer_callback_cls);
/**
- * Set the share of incoming/outgoing bandwidth for the given
- * peer to the specified amount.
+ * Cancel request to monitor peers
*
- * @param handle connection to transport service
- * @param target who's bandwidth quota is being changed
- * @param quota_in incoming bandwidth quota
- * @param quota_out outgoing bandwidth quota
+ * @param pic handle for the request to cancel
*/
void
-GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target,
- struct GNUNET_BANDWIDTH_Value32NBO quota_in,
- struct GNUNET_BANDWIDTH_Value32NBO quota_out);
+GNUNET_TRANSPORT_monitor_peers_cancel (struct GNUNET_TRANSPORT_PeerMonitoringContext *pic);
-/**
- * Opaque handle for a transmission-ready request.
- */
-struct GNUNET_TRANSPORT_TransmitHandle;
-
+/* *********************** Blacklisting ************************ */
/**
- * Check if we could queue a message of the given size for
- * transmission. The transport service will take both its internal
- * buffers and bandwidth limits imposed by the other peer into
- * consideration when answering this query.
- *
- * @param handle connection to transport service
- * @param target who should receive the message
- * @param size how big is the message we want to transmit?
- * @param priority how important is the message? @deprecated - remove?
- * @param timeout after how long should we give up (and call
- * notify with buf NULL and size 0)?
- * @param notify function to call when we are ready to
- * send such a message
- * @param notify_cls closure for notify
- * @return NULL if someone else is already waiting to be notified
- * non-NULL if the notify callback was queued (can be used to cancel
- * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
- */
-struct GNUNET_TRANSPORT_TransmitHandle *
-GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity
- *target, size_t size, uint32_t priority,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_CONNECTION_TransmitReadyNotify
- notify, void *notify_cls);
-
-
-/**
- * Cancel the specified transmission-ready notification.
- *
- * @param th handle of the transmission notification request to cancel
+ * Handle for blacklisting peers.
*/
-void
-GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
- GNUNET_TRANSPORT_TransmitHandle
- *th);
-
+struct GNUNET_TRANSPORT_Blacklist;
/**
- * Function called whenever there is an update to the
- * HELLO of this peer.
+ * Function that decides if a connection is acceptable or not.
*
* @param cls closure
- * @param hello our updated HELLO
- */
-typedef void (*GNUNET_TRANSPORT_HelloUpdateCallback) (void *cls,
- const struct
- GNUNET_MessageHeader *
- hello);
-
-
-/**
- * Handle to cancel a 'GNUNET_TRANSPORT_get_hello' operation.
+ * @param pid peer to approve or disapproave
+ * @return #GNUNET_OK if the connection is allowed, #GNUNET_SYSERR if not
*/
-struct GNUNET_TRANSPORT_GetHelloHandle;
+typedef int
+(*GNUNET_TRANSPORT_BlacklistCallback) (void *cls,
+ const struct GNUNET_PeerIdentity *pid);
/**
- * Obtain updates on changes to the HELLO message for this peer.
+ * Install a blacklist callback. The service will be queried for all
+ * existing connections as well as any fresh connections to check if
+ * they are permitted. If the blacklisting callback is unregistered,
+ * all hosts that were denied in the past will automatically be
+ * whitelisted again. Cancelling the blacklist handle is also the
+ * only way to re-enable connections from peers that were previously
+ * blacklisted.
*
- * @param handle connection to transport service
- * @param rec function to call with the HELLO
- * @param rec_cls closure for rec
- * @return handle to cancel the operation
+ * @param cfg configuration to use
+ * @param cb callback to invoke to check if connections are allowed
+ * @param cb_cls closure for @a cb
+ * @return NULL on error, otherwise handle for cancellation
*/
-struct GNUNET_TRANSPORT_GetHelloHandle *
-GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
- GNUNET_TRANSPORT_HelloUpdateCallback rec,
- void *rec_cls);
+struct GNUNET_TRANSPORT_Blacklist *
+GNUNET_TRANSPORT_blacklist (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_TRANSPORT_BlacklistCallback cb,
+ void *cb_cls);
/**
- * Stop receiving updates about changes to our HELLO message.
+ * Abort the blacklist. Note that this function is the only way for
+ * removing a peer from the blacklist.
*
- * @param ghh handle returned from 'GNUNET_TRANSPORT_get_hello')
+ * @param br handle of the request that is to be cancelled
*/
void
-GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh);
+GNUNET_TRANSPORT_blacklist_cancel (struct GNUNET_TRANSPORT_Blacklist *br);
/**
- * Offer the transport service the HELLO of another peer. Note that
- * the transport service may just ignore this message if the HELLO is
- * malformed or useless due to our local configuration.
- *
- * @param handle connection to transport service
- * @param hello the hello message
- * @param cont continuation to call when HELLO has been sent
- * @param cls closure for continuation
+ * Handle for a plugin session state monitor.
*/
-void
-GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_MessageHeader *hello,
- GNUNET_SCHEDULER_Task cont, void *cls);
-
+struct GNUNET_TRANSPORT_PluginMonitor;
/**
- * Handle to cancel a pending address lookup.
+ * Abstract representation of a plugin's session.
+ * Corresponds to the `struct GNUNET_ATS_Session` within the TRANSPORT service.
*/
-struct GNUNET_TRANSPORT_AddressLookupContext;
+struct GNUNET_TRANSPORT_PluginSession;
/**
- * Convert a binary address into a human readable address.
- *
- * @param cfg configuration to use
- * @param address address to convert (binary format)
- * @param addressLen number of bytes in address
- * @param numeric should (IP) addresses be displayed in numeric form
- * (otherwise do reverse DNS lookup)
- * @param nameTrans name of the transport to which the address belongs
- * @param timeout how long is the lookup allowed to take at most
- * @param aluc function to call with the results
- * @param aluc_cls closure for aluc
- * @return handle to cancel the operation, NULL on error
+ * Possible states of a session in a plugin.
*/
-struct GNUNET_TRANSPORT_AddressLookupContext *
-GNUNET_TRANSPORT_address_lookup (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const char *address, size_t addressLen,
- int numeric, const char *nameTrans,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressLookUpCallback aluc,
- void *aluc_cls);
+enum GNUNET_TRANSPORT_SessionState
+{
+ /**
+ * The session was created (first call for each session object).
+ */
+ GNUNET_TRANSPORT_SS_INIT,
-/**
- * Cancel request for address conversion.
- *
- * @param alc handle for the request to cancel
- */
-void
-GNUNET_TRANSPORT_address_lookup_cancel (struct
- GNUNET_TRANSPORT_AddressLookupContext
- *alc);
+ /**
+ * Initial session handshake is in progress.
+ */
+ GNUNET_TRANSPORT_SS_HANDSHAKE,
+ /**
+ * Session is fully UP.
+ */
+ GNUNET_TRANSPORT_SS_UP,
-/**
- * Handle to cancel a pending address lookup.
- */
-struct GNUNET_TRANSPORT_AddressLookupContext;
+ /**
+ * This is just an update about the session,
+ * the state did not change.
+ */
+ GNUNET_TRANSPORT_SS_UPDATE,
+ /**
+ * Session is being torn down and about to disappear.
+ * Last call for each session object.
+ */
+ GNUNET_TRANSPORT_SS_DONE
-/**
- * Return all the known addresses for a peer. FIXME: document better!
- * FIXME: use better name!
- *
- * @param cfg configuration to use
- * @param peer peer identity to look up the addresses of
- * @param timeout how long is the lookup allowed to take at most
- * @param peer_address_callback function to call with the results
- * @param peer_address_callback_cls closure for peer_address_callback
- */
-struct GNUNET_TRANSPORT_PeerAddressLookupContext *
-GNUNET_TRANSPORT_peer_address_lookup (const struct GNUNET_CONFIGURATION_Handle
- *cfg,
- const struct GNUNET_PeerIdentity *peer,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressLookUpCallback
- peer_address_callback,
- void *peer_address_callback_cls);
+};
/**
- * Cancel request for peer lookup.
- *
- * @param alc handle for the request to cancel
+ * Information about a plugin's session.
*/
-void
-GNUNET_TRANSPORT_peer_address_lookup_cancel (struct
- GNUNET_TRANSPORT_PeerAddressLookupContext
- *alc);
+struct GNUNET_TRANSPORT_SessionInfo
+{
+ /**
+ * New state of the session.
+ */
+ enum GNUNET_TRANSPORT_SessionState state;
-/**
- * Return all the known addresses. FIXME: document better!
- * FIXME: use better name! FIXME: extend API to allow cancellation!
- *
- * @param cfg configuration to use
- * @param timeout how long is the lookup allowed to take at most
- * @param peer_address_callback function to call with the results
- * @param peer_address_callback_cls closure for peer_address_callback
- */
-void
-GNUNET_TRANSPORT_address_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressLookUpBinaryCallback
- peer_address_callback,
- void *peer_address_callback_cls);
+ /**
+ * #GNUNET_YES if this is an inbound connection,
+ * #GNUNET_NO if this is an outbound connection,
+ * #GNUNET_SYSERR if connections of this plugin
+ * are so fundamentally bidirectional
+ * that they have no 'initiator'
+ */
+ int is_inbound;
+ /**
+ * Number of messages pending transmission for this session.
+ */
+ uint32_t num_msg_pending;
-/**
- * Handle for blacklisting peers.
- */
-struct GNUNET_TRANSPORT_Blacklist;
+ /**
+ * Number of bytes pending transmission for this session.
+ */
+ uint32_t num_bytes_pending;
+ /**
+ * Until when does this plugin refuse to receive to manage
+ * staying within the inbound quota? ZERO if receive is
+ * active.
+ */
+ struct GNUNET_TIME_Absolute receive_delay;
-/**
- * Function that decides if a connection is acceptable or not.
- *
- * @param cls closure
- * @param pid peer to approve or disapproave
- * @return GNUNET_OK if the connection is allowed
- */
-typedef int (*GNUNET_TRANSPORT_BlacklistCallback) (void *cls,
- const struct
- GNUNET_PeerIdentity * pid);
+ /**
+ * At what time will this session timeout (unless activity
+ * happens)?
+ */
+ struct GNUNET_TIME_Absolute session_timeout;
+
+ /**
+ * Address used by the session. Can be NULL if none is available.
+ */
+ const struct GNUNET_HELLO_Address *address;
+};
/**
- * Install a blacklist callback. The service will be queried for all
- * existing connections as well as any fresh connections to check if
- * they are permitted. If the blacklisting callback is unregistered,
- * all hosts that were denied in the past will automatically be
- * whitelisted again. Cancelling the blacklist handle is also the
- * only way to re-enable connections from peers that were previously
- * blacklisted.
+ * Function called by the plugin with information about the
+ * current sessions managed by the plugin (for monitoring).
+ *
+ * @param cls closure
+ * @param session session handle this information is about,
+ * NULL to indicate that we are "in sync" (initial
+ * iteration complete)
+ * @param session_ctx storage location where the application
+ * can store data; will point to NULL on #GNUNET_TRANSPORT_SS_INIT,
+ * and must be reset to NULL on #GNUNET_TRANSPORT_SS_DONE
+ * @param info information about the state of the session,
+ * NULL if @a session is also NULL and we are
+ * merely signalling that the initial iteration is over;
+ * NULL with @a session being non-NULL if the monitor
+ * was being cancelled while sessions were active
+ */
+typedef void
+(*GNUNET_TRANSPORT_SessionMonitorCallback) (void *cls,
+ struct GNUNET_TRANSPORT_PluginSession *session,
+ void **session_ctx,
+ const struct GNUNET_TRANSPORT_SessionInfo *info);
+
+
+/**
+ * Install a plugin session state monitor callback. The callback
+ * will be notified whenever the session changes.
*
* @param cfg configuration to use
- * @param cb callback to invoke to check if connections are allowed
- * @param cb_cls closure for cb
+ * @param cb callback to invoke on events
+ * @param cb_cls closure for @a cb
* @return NULL on error, otherwise handle for cancellation
*/
-struct GNUNET_TRANSPORT_Blacklist *
-GNUNET_TRANSPORT_blacklist (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_TRANSPORT_BlacklistCallback cb,
- void *cb_cls);
+struct GNUNET_TRANSPORT_PluginMonitor *
+GNUNET_TRANSPORT_monitor_plugins (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_TRANSPORT_SessionMonitorCallback cb,
+ void *cb_cls);
/**
- * Abort the blacklist. Note that this function is the only way for
- * removing a peer from the blacklist.
+ * Cancel monitoring the plugin session state. The callback will be
+ * called once for each session that is up with the "info" argument
+ * being NULL (this is just to enable client-side cleanup).
*
- * @param br handle of the request that is to be cancelled
+ * @param pm handle of the request that is to be cancelled
*/
void
-GNUNET_TRANSPORT_blacklist_cancel (struct GNUNET_TRANSPORT_Blacklist *br);
+GNUNET_TRANSPORT_monitor_plugins_cancel (struct GNUNET_TRANSPORT_PluginMonitor *pm);
/* ifndef GNUNET_TRANSPORT_SERVICE_H */
#endif
+
+/** @} */ /* end of group */
+
/* end of gnunet_transport_service.h */