/*
This file is part of GNUnet.
- (C) 2009-2014 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
/**
* Version number of the transport API.
*/
-#define GNUNET_TRANSPORT_VERSION 0x00000001
-
-
-/**
- * Function called by the transport for each received message.
- *
- * @param cls closure
- * @param peer (claimed) identity of the other peer
- * @param message the message
- */
-typedef void
-(*GNUNET_TRANSPORT_ReceiveCallback) (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_MessageHeader *message);
-
-
-/**
- * Opaque handle to the service.
- */
-struct GNUNET_TRANSPORT_Handle;
-
-
-/**
- * Function called to notify transport users that another
- * peer connected to us.
- *
- * @param cls closure
- * @param peer the peer that connected
- */
-typedef void
-(*GNUNET_TRANSPORT_NotifyConnect) (void *cls,
- const struct GNUNET_PeerIdentity *peer);
-
-/**
- * Function called to notify transport users that another
- * peer disconnected from us.
- *
- * @param cls closure
- * @param peer the peer that disconnected
- */
-typedef void
-(*GNUNET_TRANSPORT_NotifyDisconnect) (void *cls,
- const struct GNUNET_PeerIdentity *peer);
-
-
-/**
- * Connect to the transport service. Note that the connection may
- * complete (or fail) asynchronously.
- *
- * @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, or NULL
- * @param nc function to call on connect events, or NULL
- * @param nd function to call on disconnect events, or NULL
- * @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);
-
-
-/**
- * Function called if we have "excess" bandwidth to a peer.
- * The notification will happen the first time we have excess
- * bandwidth, and then only again after the client has performed
- * some transmission to the peer.
- *
- * Excess bandwidth is defined as being allowed (by ATS) to send
- * more data, and us reaching the limit of the capacity build-up
- * (which, if we go past it, means we don't use available bandwidth).
- * See also the "max carry" in `struct GNUNET_BANDWIDTH_Tracker`.
- *
- * @param cls the closure
- * @param neighbour peer that we have excess bandwidth to
- */
-typedef void
-(*GNUNET_TRANSPORT_NotifyExcessBandwidth)(void *cls,
- const struct GNUNET_PeerIdentity *neighbour);
-
-
-/**
- * Connect to the transport service. Note that the connection may
- * complete (or fail) asynchronously.
- *
- * @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, or NULL
- * @param nc function to call on connect events, or NULL
- * @param nd function to call on disconnect events, or NULL
- * @param neb function to call if we have excess bandwidth to a peer
- * @return NULL on error
- */
-struct GNUNET_TRANSPORT_Handle *
-GNUNET_TRANSPORT_connect2 (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,
- GNUNET_TRANSPORT_NotifyExcessBandwidth neb);
-
-
-/**
- * Disconnect from the transport service.
- *
- * @param handle handle returned from connect
- */
-void
-GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle);
-
-
-/* ************************* Connections *********************** */
-
-/**
- * Opaque handle for a transmission-ready request.
- */
-struct GNUNET_TRANSPORT_TryConnectHandle;
-
-/**
- * Function to call with result of the try connect request.
- *
- * @param cls closure
- * @param result #GNUNET_OK if message was transmitted to transport service
- * #GNUNET_SYSERR if message was not transmitted to transport service
- */
-typedef void
-(*GNUNET_TRANSPORT_TryConnectCallback) (void *cls,
- const int result);
-
-
-/**
- * Ask the transport service to establish a connection to
- * the given peer.
- *
- * @param handle connection to transport service
- * @param target who we should try to connect to
- * @param cb callback to be called when request was transmitted to transport
- * service
- * @param cb_cls closure for the callback @a cb
- * @return a `struct GNUNET_TRANSPORT_TryConnectHandle` handle or
- * NULL on failure (@a cb will not be called)
- */
-struct GNUNET_TRANSPORT_TryConnectHandle *
-GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target,
- GNUNET_TRANSPORT_TryConnectCallback cb,
- void *cb_cls);
-
-
-/**
- * Cancel the request to transport to try a connect
- * Callback will not be called
- *
- * @param tch handle to cancel
- */
-void
-GNUNET_TRANSPORT_try_connect_cancel (struct GNUNET_TRANSPORT_TryConnectHandle *tch);
-
-
-/**
- * Ask the transport service to disconnect from the given peer.
- *
- * @param handle connection to transport service
- * @param target who we should try to disconnect from
- * @param cb callback to be called when request was transmitted to transport
- * service
- * @param cb_cls closure for the callback @a cb
- * @return a `struct GNUNET_TRANSPORT_TryConnectHandle` handle or
- * NULL on failure (@a cb will not be called)
- */
-struct GNUNET_TRANSPORT_TryConnectHandle *
-GNUNET_TRANSPORT_try_disconnect (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target,
- GNUNET_TRANSPORT_TryConnectCallback cb,
- void *cb_cls);
-
-
-/**
- * Cancel the request to transport to disconnect.
- * Callback will not be called anymore.
- *
- * @param tch handle for operation to cancel
- */
-void
-GNUNET_TRANSPORT_try_disconnect_cancel (struct GNUNET_TRANSPORT_TryConnectHandle *tch);
-
-
-/* ************************* Sending *************************** */
-
-/**
- * Opaque handle for a transmission-ready request.
- */
-struct GNUNET_TRANSPORT_TransmitHandle;
-
-
-/**
- * Function called to notify a client about the connection begin ready
- * to queue more data. @a buf will be NULL and @a size zero if the
- * connection was closed for writing in the meantime.
- *
- * @param cls closure
- * @param size number of bytes available in @a buf
- * @param buf where the callee should write the message
- * @return number of bytes written to @a buf
- */
-typedef size_t
-(*GNUNET_TRANSPORT_TransmitReadyNotify) (void *cls,
- size_t size,
- void *buf);
-
-
-/**
- * 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 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 @a 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,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_TransmitReadyNotify notify,
- void *notify_cls);
-
-
-/**
- * Cancel the specified transmission-ready notification.
- *
- * @param th handle of the transmission notification request to cancel
- */
-void
-GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct GNUNET_TRANSPORT_TransmitHandle *th);
-
-
-
-/**
- * Checks if a given peer is connected to us
- *
- * @param handle connection to transport service
- * @param peer the peer to check
- * @return #GNUNET_YES (connected) or #GNUNET_NO (disconnected)
- */
-int
-GNUNET_TRANSPORT_check_peer_connected (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *peer);
-
-
-
-/* *********************** Metric manipulation ***************** */
-
-/**
- * Set transport metrics for a peer and a direction
- *
- * @param handle transport handle
- * @param peer the peer to set the metric for
- * @param inbound set inbound direction (#GNUNET_YES or #GNUNET_NO)
- * @param outbound set outbound direction (#GNUNET_YES or #GNUNET_NO)
- * @param ats the metric as ATS information
- * @param ats_count the number of metrics
- *
- * Supported ATS values:
- * #GNUNET_ATS_QUALITY_NET_DELAY (value in ms)
- * #GNUNET_ATS_QUALITY_NET_DISTANCE (value in count(hops))
- *
- * Example
- * To enforce a delay of 10 ms for peer p1 in sending direction use:
- *
- * struct GNUNET_ATS_Information ats;
- * ats.type = ntohl (GNUNET_ATS_QUALITY_NET_DELAY);
- * ats.value = ntohl (10);
- * GNUNET_TRANSPORT_set_traffic_metric (th, p1, TM_SEND, &ats, 1);
- *
- * Note:
- * Delay restrictions in receiving direction will be enforced with
- * 1 message delay.
- */
-void
-GNUNET_TRANSPORT_set_traffic_metric (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *peer,
- int inbound,
- int outbound,
- const struct GNUNET_ATS_Information *ats,
- size_t ats_count);
+#define GNUNET_TRANSPORT_VERSION 0x00000003
/* *************************** HELLO *************************** */
-
-/**
- * Function called whenever there is an update to the
- * HELLO of this peer.
- *
- * @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.
- */
-struct GNUNET_TRANSPORT_GetHelloHandle;
-
-
-/**
- * Obtain updates on changes to the HELLO message for this peer. The callback
- * given in this function is never called synchronously.
- *
- * @param handle connection to transport service
- * @param rec function to call with the HELLO
- * @param rec_cls closure for @a rec
- * @return handle to cancel the operation
- */
-struct GNUNET_TRANSPORT_GetHelloHandle *
-GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
- GNUNET_TRANSPORT_HelloUpdateCallback rec,
- void *rec_cls);
-
-
-/**
- * Stop receiving updates about changes to our HELLO message.
- *
- * @param ghh handle to cancel
- */
-void
-GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh);
-
-
/**
* Handle for a #GNUNET_TRANSPORT_offer_hello operation
*/
struct GNUNET_TRANSPORT_OfferHelloHandle;
+
/**
* 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 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 cls closure for continuation
- * @return a GNUNET_TRANSPORT_OfferHelloHandle handle or NULL on failure,
- * in case of failure cont will not be called
+ * @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
*
*/
struct GNUNET_TRANSPORT_OfferHelloHandle *
-GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
+GNUNET_TRANSPORT_offer_hello (const struct GNUNET_CONFIGURATION_Handle *cfg,
const struct GNUNET_MessageHeader *hello,
- GNUNET_SCHEDULER_Task cont, void *cls);
+ GNUNET_SCHEDULER_TaskCallback cont,
+ void *cont_cls);
/**
/**
* Cancel request for address conversion.
*
- * @param pic the context handle
+ * @param alc the context handle
*/
void
-GNUNET_TRANSPORT_address_to_string_cancel (struct GNUNET_TRANSPORT_AddressToStringContext *pic);
+GNUNET_TRANSPORT_address_to_string_cancel (struct GNUNET_TRANSPORT_AddressToStringContext *alc);
/* *********************** Monitoring ************************** */
/**
* Possible state of a neighbour. Initially, we are #GNUNET_TRANSPORT_PS_NOT_CONNECTED.
*
- * Then, there are two main paths. If we receive a CONNECT message, we give
+ * 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 CONNECT_ACK and go to #GNUNET_TRANSPORT_PS_CONNECT_RECV_ACK.
- * If we receive a SESSION_ACK, we go to #GNUNET_TRANSPORT_PS_CONNECTED
+ * 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 CONNECT message first. We
+ * 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 CONNECT message and go to state #GNUNET_TRANSPORT_PS_CONNECT_SENT.
- * Once we receive a CONNECT_ACK, we go to #GNUNET_TRANSPORT_PS_CONNECTED
+ * 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 SESSION_ACK). If the operation times out, we go to
+ * 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
- * CONNECT message. If we receive a
- * CONNECT_ACK, we go to #GNUNET_TRANSPORT_PS_CONNECTED and nobody noticed that we had
- * trouble; we also send a SESSION_ACK at this time just in case. If
+ * 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_CONNECT_SENT
- * and send a SESSION_CONNECT. If we get a SESSION_ACK back, we switch the
+ * 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 SESSION_ACK to the other peer just to be
+ * 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").
* generating disconnect notifications.
*
* Note that it is quite possible that while we are in any of these
- * states, we could receive a 'CONNECT' request from the other peer.
+ * 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 'CONNECT_ACK'
- * (because we have an acceptable address), we send the 'CONNECT_ACK'
+ * 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
- * 'SESSION_ACK', we go to #GNUNET_TRANSPORT_PS_CONNECTED (and reset 'send_connect_ack'
+ * 'ACK', we go to #GNUNET_TRANSPORT_PS_CONNECTED (and reset 'send_connect_ack'
* to 0).
*
*/
GNUNET_TRANSPORT_PS_INIT_ATS,
/**
- * Sent CONNECT message to other peer, waiting for CONNECT_ACK
+ * Sent SYN message to other peer, waiting for SYN_ACK
*/
- GNUNET_TRANSPORT_PS_CONNECT_SENT,
+ GNUNET_TRANSPORT_PS_SYN_SENT,
/**
- * Received a CONNECT, asking ATS about address suggestions.
+ * Received a SYN, asking ATS about address suggestions.
*/
- GNUNET_TRANSPORT_PS_CONNECT_RECV_ATS,
+ GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
/**
- * CONNECT request from other peer was CONNECT_ACK'ed, waiting for
- * SESSION_ACK.
+ * SYN request from other peer was SYN_ACK'ed, waiting for ACK.
*/
- GNUNET_TRANSPORT_PS_CONNECT_RECV_ACK,
+ GNUNET_TRANSPORT_PS_SYN_RECV_ACK,
/**
- * Got our CONNECT_ACK/SESSION_ACK, connection is up.
+ * Got our SYN_ACK/ACK, connection is up.
*/
GNUNET_TRANSPORT_PS_CONNECTED,
GNUNET_TRANSPORT_PS_RECONNECT_ATS,
/**
- * Sent CONNECT over new address (either by ATS telling us to switch
+ * 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.
*/
/**
* We have some primary connection, but ATS suggested we switch
- * to some alternative; we now sent a CONNECT message for the
+ * to some alternative; we now sent a SYN message for the
* alternative session to the other peer and waiting for a
- * CONNECT_ACK to make this our primary connection.
+ * SYN_ACK to make this our primary connection.
*/
- GNUNET_TRANSPORT_PS_CONNECTED_SWITCHING_CONNECT_SENT,
+ GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT,
/**
* Disconnect in progress (we're sending the DISCONNECT message to the
* a final call with NULL for peer and address will follow when done.
* In this case state and timeout do not contain valid values.
*
- * The #GNUNET_TRANSPORT_monitor_peers_cancel call MUST not be called from
+ * The #GNUNET_TRANSPORT_monitor_peers_cancel() call MUST not be called from
* within this function!
*
*
* @param cls closure
* @param peer peer this update is about,
* NULL if this is the final last callback for a iteration operation
- * @param address address, NULL for disconnect notification in monitor mode
+ * @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
*/
* to communicate with this peer, the state this peer is currently in and the
* the current timeout for this state.
*
- * Upon completion, the 'GNUNET_TRANSPORT_PeerIterateCallback' is called one
- * more time with 'NULL'. After this, the operation must no longer be
+ * 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
* 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 timeout how long is the lookup allowed to take at most
* @param peer_callback function to call with the results
* @param peer_callback_cls closure for @a peer_callback
*/
GNUNET_TRANSPORT_monitor_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
const struct GNUNET_PeerIdentity *peer,
int one_shot,
- struct GNUNET_TIME_Relative timeout,
GNUNET_TRANSPORT_PeerIterateCallback peer_callback,
void *peer_callback_cls);
GNUNET_TRANSPORT_monitor_peers_cancel (struct GNUNET_TRANSPORT_PeerMonitoringContext *pic);
+/* *********************** Blacklisting ************************ */
+
/**
- * Handle for a #GNUNET_TRANSPORT_monitor_validation_entries() operation.
+ * Handle for blacklisting peers.
*/
-struct GNUNET_TRANSPORT_ValidationMonitoringContext;
+struct GNUNET_TRANSPORT_Blacklist;
/**
- * Current state of a validation process.
+ * Function that decides if a connection is acceptable or not.
*
- * FIXME: what state is used to indicate that a validation
- * was successful? If that is clarified/determined, "UGH" in
- * ~gnunet-peerinfo-gtk.c:1103 should be resolved.
+ * @param cls closure
+ * @param pid peer to approve or disapproave
+ * @return #GNUNET_OK if the connection is allowed, #GNUNET_SYSERR if not
*/
-enum GNUNET_TRANSPORT_ValidationState
+typedef int
+(*GNUNET_TRANSPORT_BlacklistCallback) (void *cls,
+ const struct GNUNET_PeerIdentity *pid);
+
+
+/**
+ * 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 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_Blacklist *
+GNUNET_TRANSPORT_blacklist (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_TRANSPORT_BlacklistCallback cb,
+ void *cb_cls);
+
+
+/**
+ * Abort the blacklist. Note that this function is the only way for
+ * removing a peer from the blacklist.
+ *
+ * @param br handle of the request that is to be cancelled
+ */
+void
+GNUNET_TRANSPORT_blacklist_cancel (struct GNUNET_TRANSPORT_Blacklist *br);
+
+
+/**
+ * Handle for a plugin session state monitor.
+ */
+struct GNUNET_TRANSPORT_PluginMonitor;
+
+/**
+ * Abstract representation of a plugin's session.
+ * Corresponds to the `struct GNUNET_ATS_Session` within the TRANSPORT service.
+ */
+struct GNUNET_TRANSPORT_PluginSession;
+
+
+/**
+ * Possible states of a session in a plugin.
+ */
+enum GNUNET_TRANSPORT_SessionState
{
+
/**
- * Undefined state
- *
- * Used for final callback indicating operation done
+ * The session was created (first call for each session object).
*/
- GNUNET_TRANSPORT_VS_NONE,
+ GNUNET_TRANSPORT_SS_INIT,
/**
- * Fresh validation entry
- *
- * Entry was just created, no validation process was executed
+ * Initial session handshake is in progress.
*/
- GNUNET_TRANSPORT_VS_NEW,
+ GNUNET_TRANSPORT_SS_HANDSHAKE,
/**
- * Updated validation entry
- *
- * This is an update for an existing validation entry
+ * Session is fully UP.
*/
- GNUNET_TRANSPORT_VS_UPDATE,
+ GNUNET_TRANSPORT_SS_UP,
/**
- * Timeout for validation entry
- *
- * A timeout occured during the validation process
+ * This is just an update about the session,
+ * the state did not change.
*/
- GNUNET_TRANSPORT_VS_TIMEOUT,
+ GNUNET_TRANSPORT_SS_UPDATE,
/**
- * Validation entry is removed
- *
- * The validation entry is getting removed due to a failed validation
+ * Session is being torn down and about to disappear.
+ * Last call for each session object.
*/
- GNUNET_TRANSPORT_VS_REMOVE
-};
+ GNUNET_TRANSPORT_SS_DONE
-
-/**
- * Function to call with validation information about a peer
- *
- * This function is called by the transport validation monitoring api to
- * indicate a change to a validation entry. The information included represent
- * the current state of the validation entry,
- *
- * If the monitoring was called with one_shot=GNUNET_YES, a final callback
- * with peer==NULL and address==NULL is executed.
- *
- * @param cls closure
- * @param peer peer this update is about,
- * NULL if this is the final last callback for a iteration operation
- * @param address address,
- * NULL for disconnect notification in monitor mode
- * @param last_validation when was this address last validated
- * @param valid_until when does this address expire
- * @param next_validation time of the next validation operation
- * @param state state in the validation state machine
- */
-typedef void
-(*GNUNET_TRANSPORT_ValidationIterateCallback) (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Address *address,
- struct GNUNET_TIME_Absolute last_validation,
- struct GNUNET_TIME_Absolute valid_until,
- struct GNUNET_TIME_Absolute next_validation,
- enum GNUNET_TRANSPORT_ValidationState state);
+};
/**
- * Convert validation state to human-readable string.
- *
- * @param state the state value
- * @return corresponding string
+ * Information about a plugin's session.
*/
-const char *
-GNUNET_TRANSPORT_vs2s (enum GNUNET_TRANSPORT_ValidationState state);
+struct GNUNET_TRANSPORT_SessionInfo
+{
+ /**
+ * New state of the session.
+ */
+ enum GNUNET_TRANSPORT_SessionState state;
-/**
- * Return information about pending address validation operations for a specific
- * or all peers
- *
- * @param cfg configuration to use
- * @param peer a specific peer identity to obtain validation entries for,
- * NULL for all peers
- * @param one_shot #GNUNET_YES to return all entries and then end (with NULL+NULL),
- * #GNUNET_NO to monitor validation entries continuously
- * @param timeout how long is the lookup allowed to take at most
- * @param validation_callback function to call with the results
- * @param validation_callback_cls closure for @a validation_callback
- */
-struct GNUNET_TRANSPORT_ValidationMonitoringContext *
-GNUNET_TRANSPORT_monitor_validation_entries (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_PeerIdentity *peer,
- int one_shot,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_ValidationIterateCallback validation_callback,
- void *validation_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;
-/**
- * Return information about all current pending validation operations
- *
- * @param vic handle for the request to cancel
- */
-void
-GNUNET_TRANSPORT_monitor_validation_entries_cancel (struct GNUNET_TRANSPORT_ValidationMonitoringContext *vic);
+ /**
+ * 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;
-/* *********************** Blacklisting ************************ */
+ /**
+ * At what time will this session timeout (unless activity
+ * happens)?
+ */
+ struct GNUNET_TIME_Absolute session_timeout;
-/**
- * Handle for blacklisting peers.
- */
-struct GNUNET_TRANSPORT_Blacklist;
+ /**
+ * Address used by the session. Can be NULL if none is available.
+ */
+ const struct GNUNET_HELLO_Address *address;
+};
/**
- * Function that decides if a connection is acceptable or not.
+ * Function called by the plugin with information about the
+ * current sessions managed by the plugin (for monitoring).
*
* @param cls closure
- * @param pid peer to approve or disapproave
- * @return #GNUNET_OK if the connection is allowed, #GNUNET_SYSERR if not
+ * @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 int
-(*GNUNET_TRANSPORT_BlacklistCallback) (void *cls,
- const struct GNUNET_PeerIdentity *pid);
+typedef void
+(*GNUNET_TRANSPORT_SessionMonitorCallback) (void *cls,
+ struct GNUNET_TRANSPORT_PluginSession *session,
+ void **session_ctx,
+ const struct GNUNET_TRANSPORT_SessionInfo *info);
/**
- * 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.
+ * 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 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 gnunet_transport_service.h */
+/** @} */ /* end of group */
+/* end of gnunet_transport_service.h */
projects / oweals / gnunet.git / blobdiff