--- /dev/null
+/*
+ This file is part of GNUnet.
+ (C) 2010,2011 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ 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.
+*/
+
+/**
+ * @file transport/gnunet-service-transport_neighbours.c
+ * @brief neighbour management
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_ats_service.h"
+#include "gnunet-service-transport_neighbours.h"
+#include "gnunet-service-transport_plugins.h"
+#include "gnunet-service-transport_validation.h"
+#include "gnunet-service-transport_clients.h"
+#include "gnunet-service-transport.h"
+#include "gnunet_peerinfo_service.h"
+#include "gnunet_constants.h"
+#include "transport.h"
+
+
+/**
+ * Size of the neighbour hash map.
+ */
+#define NEIGHBOUR_TABLE_SIZE 256
+
+/**
+ * How often must a peer violate bandwidth quotas before we start
+ * to simply drop its messages?
+ */
+#define QUOTA_VIOLATION_DROP_THRESHOLD 10
+
+/**
+ * How often do we send KEEPALIVE messages to each of our neighbours?
+ * (idle timeout is 5 minutes or 300 seconds, so with 90s interval we
+ * send 3 keepalives in each interval, so 3 messages would need to be
+ * lost in a row for a disconnect).
+ */
+#define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 90)
+
+
+/**
+ * Entry in neighbours.
+ */
+struct NeighbourMapEntry;
+
+/**
+ * Message a peer sends to another to indicate its
+ * preference for communicating via a particular
+ * session (and the desire to establish a real
+ * connection).
+ */
+struct SessionConnectMessage
+{
+ /**
+ * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Always zero.
+ */
+ uint32_t reserved GNUNET_PACKED;
+
+ /**
+ * Absolute time at the sender. Only the most recent connect
+ * message implies which session is preferred by the sender.
+ */
+ struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+};
+
+
+struct SessionDisconnectMessage
+{
+ /**
+ * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Always zero.
+ */
+ uint32_t reserved GNUNET_PACKED;
+
+ /**
+ * Purpose of the signature. Extends over the timestamp.
+ * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
+ */
+ struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
+
+ /**
+ * Absolute time at the sender. Only the most recent connect
+ * message implies which session is preferred by the sender.
+ */
+ struct GNUNET_TIME_AbsoluteNBO timestamp;
+
+ /**
+ * Public key of the sender.
+ */
+ struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
+
+ /**
+ * Signature of the peer that sends us the disconnect. Only
+ * valid if the timestamp is AFTER the timestamp from the
+ * corresponding 'CONNECT' message.
+ */
+ struct GNUNET_CRYPTO_RsaSignature signature;
+
+};
+
+
+/**
+ * For each neighbour we keep a list of messages
+ * that we still want to transmit to the neighbour.
+ */
+struct MessageQueue
+{
+
+ /**
+ * This is a doubly linked list.
+ */
+ struct MessageQueue *next;
+
+ /**
+ * This is a doubly linked list.
+ */
+ struct MessageQueue *prev;
+
+ /**
+ * Once this message is actively being transmitted, which
+ * neighbour is it associated with?
+ */
+ struct NeighbourMapEntry *n;
+
+ /**
+ * Function to call once we're done.
+ */
+ GST_NeighbourSendContinuation cont;
+
+ /**
+ * Closure for 'cont'
+ */
+ void *cont_cls;
+
+ /**
+ * The message(s) we want to transmit, GNUNET_MessageHeader(s)
+ * stuck together in memory. Allocated at the end of this struct.
+ */
+ const char *message_buf;
+
+ /**
+ * Size of the message buf
+ */
+ size_t message_buf_size;
+
+ /**
+ * At what time should we fail?
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+};
+
+enum State
+{
+ /* fresh peer or completely disconnected */
+ S_NOT_CONNECTED = 0,
+ /* sent CONNECT message to other peer, waiting for CONNECT_ACK */
+ S_CONNECT_SENT = 1,
+ /* received CONNECT message to other peer, sending CONNECT_ACK */
+ S_CONNECT_RECV = 4,
+ /* sent CONNECT_ACK message to other peer, wait for ACK or payload */
+ S_CONNECT_RECV_ACK_SENT = 8,
+ /* received ACK or payload */
+ S_CONNECTED = 16,
+ S_DISCONNECTED = 32
+};
+
+/**
+ * Entry in neighbours.
+ */
+struct NeighbourMapEntry
+{
+
+ /**
+ * Head of list of messages we would like to send to this peer;
+ * must contain at most one message per client.
+ */
+ struct MessageQueue *messages_head;
+
+ /**
+ * Tail of list of messages we would like to send to this peer; must
+ * contain at most one message per client.
+ */
+ struct MessageQueue *messages_tail;
+
+ /**
+ * Performance data for the peer.
+ */
+ //struct GNUNET_ATS_Information *ats;
+
+ /**
+ * Are we currently trying to send a message? If so, which one?
+ */
+ struct MessageQueue *is_active;
+
+ /**
+ * Active session for communicating with the peer.
+ */
+ struct Session *session;
+
+ /**
+ * Name of the plugin we currently use.
+ */
+ char *plugin_name;
+
+ /**
+ * Address used for communicating with the peer, NULL for inbound connections.
+ */
+ void *addr;
+
+ /**
+ * Number of bytes in 'addr'.
+ */
+ size_t addrlen;
+
+ /**
+ * Identity of this neighbour.
+ */
+ struct GNUNET_PeerIdentity id;
+
+ /**
+ * ID of task scheduled to run when this peer is about to
+ * time out (will free resources associated with the peer).
+ */
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+
+ /**
+ * ID of task scheduled to send keepalives.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier keepalive_task;
+
+ /**
+ * ID of task scheduled to run when we should try transmitting
+ * the head of the message queue.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier transmission_task;
+
+ /**
+ * Tracker for inbound bandwidth.
+ */
+ struct GNUNET_BANDWIDTH_Tracker in_tracker;
+
+ /**
+ * Timestamp of the 'SESSION_CONNECT' message we got from the other peer
+ */
+ struct GNUNET_TIME_Absolute connect_ts;
+
+ /**
+ * How often has the other peer (recently) violated the inbound
+ * traffic limit? Incremented by 10 per violation, decremented by 1
+ * per non-violation (for each time interval).
+ */
+ unsigned int quota_violation_count;
+
+ /**
+ * Number of values in 'ats' array.
+ */
+ //unsigned int ats_count;
+
+ /**
+ * Are we already in the process of disconnecting this neighbour?
+ */
+ int in_disconnect;
+
+ /**
+ * Do we currently consider this neighbour connected? (as far as
+ * the connect/disconnect callbacks are concerned)?
+ */
+ int is_connected;
+
+ int state;
+
+};
+
+
+/**
+ * All known neighbours and their HELLOs.
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
+
+/**
+ * Closure for connect_notify_cb and disconnect_notify_cb
+ */
+static void *callback_cls;
+
+/**
+ * Function to call when we connected to a neighbour.
+ */
+static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
+
+/**
+ * Function to call when we disconnected from a neighbour.
+ */
+static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
+
+/**
+ * counter for connected neighbours
+ */
+static int neighbours_connected;
+
+/**
+ * Lookup a neighbour entry in the neighbours hash map.
+ *
+ * @param pid identity of the peer to look up
+ * @return the entry, NULL if there is no existing record
+ */
+static struct NeighbourMapEntry *
+lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
+{
+ return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
+}
+
+#define change_state(n, state, ...) change (n, state, __LINE__)
+
+static int
+change (struct NeighbourMapEntry * n, int state, int line)
+{
+ char * old;
+ char * new;
+
+ switch (n->state) {
+ case S_CONNECTED:
+ old = "S_CONNECTED";
+ break;
+ case S_CONNECT_RECV:
+ old = "S_CONNECT_RECV";
+ break;
+ case S_CONNECT_RECV_ACK_SENT:
+ old = "S_CONNECT_RECV_ACK_SENT";
+ break;
+ case S_CONNECT_SENT:
+ old = "S_CONNECT_SENT";
+ break;
+ case S_DISCONNECTED:
+ old = "S_DISCONNECTED";
+ break;
+ case S_NOT_CONNECTED:
+ old = "S_NOT_CONNECTED";
+ break;
+ default:
+ GNUNET_break (0);
+ break;
+ }
+
+ switch (state) {
+ case S_CONNECTED:
+ new = "S_CONNECTED";
+ break;
+ case S_CONNECT_RECV:
+ new = "S_CONNECT_RECV";
+ break;
+ case S_CONNECT_RECV_ACK_SENT:
+ new = "S_CONNECT_RECV_ACK_SENT";
+ break;
+ case S_CONNECT_SENT:
+ new = "S_CONNECT_SENT";
+ break;
+ case S_DISCONNECTED:
+ new = "S_DISCONNECTED";
+ break;
+ case S_NOT_CONNECTED:
+ new = "S_NOT_CONNECTED";
+ break;
+ default:
+ GNUNET_break (0);
+ break;
+ }
+
+ /* allowed transitions */
+ switch (n->state) {
+ case S_NOT_CONNECTED:
+ if (state == S_CONNECT_RECV)
+ break;
+ if (state == S_CONNECT_SENT)
+ break;
+ case S_CONNECT_RECV:
+ if (state == S_CONNECT_RECV_ACK_SENT)
+ break;
+ case S_CONNECT_SENT:
+ if (state == S_NOT_CONNECTED)
+ break;
+ if (state == S_CONNECTED)
+ break;
+ case S_CONNECTED:
+ case S_DISCONNECTED:
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Illegal state transition from `%s' to `%s' in line %u \n",
+ old, new, line);
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ n->state = state;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "State for neighbour `%s' %X changed from `%s' to `%s' in line %u\n",
+ GNUNET_i2s (&n->id), n, old, new, line);
+ return GNUNET_OK;
+}
+
+/**
+ * Task invoked to start a transmission to another peer.
+ *
+ * @param cls the 'struct NeighbourMapEntry'
+ * @param tc scheduler context
+ */
+static void
+transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+
+/**
+ * We're done with our transmission attempt, continue processing.
+ *
+ * @param cls the 'struct MessageQueue' of the message
+ * @param receiver intended receiver
+ * @param success whether it worked or not
+ */
+static void
+transmit_send_continuation (void *cls,
+ const struct GNUNET_PeerIdentity *receiver,
+ int success)
+{
+ struct MessageQueue *mq;
+ struct NeighbourMapEntry *n;
+
+ mq = cls;
+ n = mq->n;
+ if (NULL != n)
+ {
+ GNUNET_assert (n->is_active == mq);
+ n->is_active = NULL;
+ if (success == GNUNET_YES)
+ {
+ GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
+ n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
+ }
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Sending message of type %u had result: %u\n",
+ ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type), success);
+
+ if (NULL != mq->cont)
+ mq->cont (mq->cont_cls, success);
+ GNUNET_free (mq);
+}
+
+
+/**
+ * Check the ready list for the given neighbour and if a plugin is
+ * ready for transmission (and if we have a message), do so!
+ *
+ * @param n target peer for which to transmit
+ */
+static void
+try_transmission_to_peer (struct NeighbourMapEntry *n)
+{
+ struct MessageQueue *mq;
+ struct GNUNET_TIME_Relative timeout;
+ ssize_t ret;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+
+ if (n->is_active != NULL)
+ {
+ GNUNET_break (0);
+ return; /* transmission already pending */
+ }
+ if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_break (0);
+ return; /* currently waiting for bandwidth */
+ }
+ while (NULL != (mq = n->messages_head))
+ {
+ timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
+ if (timeout.rel_value > 0)
+ break;
+ GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
+ n->is_active = mq;
+ mq->n = n;
+ transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
+ }
+ if (NULL == mq)
+ return; /* no more messages */
+
+ papi = GST_plugins_find (n->plugin_name);
+ if (papi == NULL)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
+ n->is_active = mq;
+ mq->n = n;
+
+ if ((n->session == NULL) && (n->addr == NULL) && (n->addrlen == 0))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No address for peer `%s'\n",
+ GNUNET_i2s (&n->id));
+ transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
+ GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
+ n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "try_transmission_to_peer\n");
+ papi = GST_plugins_find (n->plugin_name);
+ ret =
+ papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
+ 0 /* priority -- remove from plugin API? */ ,
+ timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
+ &transmit_send_continuation, mq);
+ if (ret == -1)
+ {
+ /* failure, but 'send' would not call continuation in this case,
+ * so we need to do it here! */
+ transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
+ }
+
+}
+
+
+/**
+ * Task invoked to start a transmission to another peer.
+ *
+ * @param cls the 'struct NeighbourMapEntry'
+ * @param tc scheduler context
+ */
+static void
+transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "transmission_task\n");
+ struct NeighbourMapEntry *n = cls;
+ GNUNET_assert (NULL != lookup_neighbour(&n->id));
+ n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
+ try_transmission_to_peer (n);
+}
+
+
+/**
+ * Initialize the neighbours subsystem.
+ *
+ * @param cls closure for callbacks
+ * @param connect_cb function to call if we connect to a peer
+ * @param disconnect_cb function to call if we disconnect from a peer
+ */
+void
+GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
+ GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
+{
+ callback_cls = cls;
+ connect_notify_cb = connect_cb;
+ disconnect_notify_cb = disconnect_cb;
+ neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
+}
+
+
+/**
+ * Disconnect from the given neighbour, clean up the record.
+ *
+ * @param n neighbour to disconnect from
+ */
+static void
+disconnect_neighbour (struct NeighbourMapEntry *n)
+{
+ struct MessageQueue *mq;
+
+ if (GNUNET_YES == n->in_disconnect)
+ return;
+ n->in_disconnect = GNUNET_YES;
+ while (NULL != (mq = n->messages_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
+ if (NULL != mq->cont)
+ mq->cont (mq->cont_cls, GNUNET_SYSERR);
+ GNUNET_free (mq);
+ }
+ if (NULL != n->is_active)
+ {
+ n->is_active->n = NULL;
+ n->is_active = NULL;
+ }
+ if (GNUNET_YES == n->is_connected)
+ {
+ n->is_connected = GNUNET_NO;
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->keepalive_task);
+ GNUNET_SCHEDULER_cancel (n->keepalive_task);
+ n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_assert (neighbours_connected > 0);
+ neighbours_connected--;
+ GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), -1,
+ GNUNET_NO);
+ disconnect_notify_cb (callback_cls, &n->id);
+ }
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (neighbours,
+ &n->id.hashPubKey, n));
+ if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (n->timeout_task);
+ n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
+ {
+ GNUNET_SCHEDULER_cancel (n->transmission_task);
+ n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != n->plugin_name)
+ {
+ GNUNET_free (n->plugin_name);
+ n->plugin_name = NULL;
+ }
+ if (NULL != n->addr)
+ {
+ GNUNET_free (n->addr);
+ n->addr = NULL;
+ n->addrlen = 0;
+ }
+ n->session = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Deleting peer `%4s', %X\n",
+ GNUNET_i2s (&n->id), n);
+ GNUNET_free (n);
+}
+
+
+/**
+ * Peer has been idle for too long. Disconnect.
+ *
+ * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
+ * @param tc scheduler context
+ */
+static void
+neighbour_timeout_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct NeighbourMapEntry *n = cls;
+
+ n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ if (GNUNET_YES == n->is_connected)
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# peers disconnected due to timeout"), 1,
+ GNUNET_NO);
+ disconnect_neighbour (n);
+}
+
+
+/**
+ * Send another keepalive message.
+ *
+ * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
+ * @param tc scheduler context
+ */
+static void
+neighbour_keepalive_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct NeighbourMapEntry *n = cls;
+ struct GNUNET_MessageHeader m;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+
+ n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
+ &neighbour_keepalive_task,
+ n);
+ GNUNET_assert (GNUNET_YES == n->is_connected);
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# keepalives sent"), 1,
+ GNUNET_NO);
+ m.size = htons (sizeof (struct GNUNET_MessageHeader));
+ m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
+ papi = GST_plugins_find (n->plugin_name);
+ if (papi != NULL)
+ papi->send (papi->cls,
+ &n->id, (const void *) &m,
+ sizeof (m),
+ UINT32_MAX /* priority */ ,
+ GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
+ GNUNET_YES, NULL, NULL);
+}
+
+
+/**
+ * Disconnect from the given neighbour.
+ *
+ * @param cls unused
+ * @param key hash of neighbour's public key (not used)
+ * @param value the 'struct NeighbourMapEntry' of the neighbour
+ */
+static int
+disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct NeighbourMapEntry *n = value;
+
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
+ GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
+#endif
+ if (GNUNET_YES == n->is_connected)
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# peers disconnected due to global disconnect"), 1,
+ GNUNET_NO);
+ disconnect_neighbour (n);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Cleanup the neighbours subsystem.
+ */
+void
+GST_neighbours_stop ()
+{
+ GNUNET_assert (neighbours != NULL);
+
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (neighbours);
+ GNUNET_assert (neighbours_connected == 0);
+ neighbours = NULL;
+ callback_cls = NULL;
+ connect_notify_cb = NULL;
+ disconnect_notify_cb = NULL;
+}
+
+
+/**
+ * We tried to send a SESSION_CONNECT message to another peer. If this
+ * succeeded, we should mark the peer up. If it failed, we should tell
+ * ATS to not use this address anymore (until it is re-validated).
+ *
+ * @param cls the 'struct NeighbourMapEntry'
+ * @param success GNUNET_OK on success
+ */
+static void
+send_connect_continuation (void *cls,
+ int success)
+{
+ struct NeighbourMapEntry *n = cls;
+
+ GNUNET_assert (n != NULL);
+ if (GNUNET_YES == n->in_disconnect)
+ return; /* neighbour is going away */
+ if (GNUNET_YES != success)
+ {
+ change_state(n, S_NOT_CONNECTED);
+ GNUNET_ATS_address_destroyed (GST_ats,
+ &n->id,
+ n->plugin_name,
+ n->addr,
+ n->addrlen,
+ NULL);
+ disconnect_neighbour (n);
+ return;
+ }
+}
+
+
+/**
+ * For an existing neighbour record, set the active connection to
+ * the given address.
+ *
+ * @param peer identity of the peer to switch the address for
+ * @param plugin_name name of transport that delivered the PONG
+ * @param address address of the other peer, NULL if other peer
+ * connected to us
+ * @param address_len number of bytes in address
+ * @param session session to use (or NULL)
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ * @return GNUNET_YES if we are currently connected, GNUNET_NO if the
+ * connection is not up (yet)
+ */
+int
+GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
+ const char *plugin_name, const void *address,
+ size_t address_len, struct Session *session,
+ const struct GNUNET_ATS_Information
+ *ats, uint32_t ats_count)
+{
+ struct NeighbourMapEntry *n;
+ struct SessionConnectMessage connect_msg;
+ //int was_connected;
+
+ GNUNET_assert (neighbours != NULL);
+ n = lookup_neighbour (peer);
+ if (NULL == n)
+ {
+ if (NULL == session)
+ GNUNET_ATS_address_destroyed (GST_ats,
+ peer,
+ plugin_name, address,
+ address_len, NULL);
+ return GNUNET_NO;
+ }
+ /*
+ was_connected = n->is_connected;
+ n->is_connected = GNUNET_YES;
+ if (GNUNET_YES != was_connected)
+ n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
+ &neighbour_keepalive_task,
+ n);*/
+
+ change_state (n, S_CONNECT_SENT);
+
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
+ GNUNET_i2s (peer), plugin_name,
+ (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
+ address,
+ address_len),
+ session);
+#endif
+ GNUNET_free_non_null (n->addr);
+ n->addr = GNUNET_malloc (address_len);
+ memcpy (n->addr, address, address_len);
+ n->addrlen = address_len;
+ n->session = session;
+ GNUNET_free_non_null (n->plugin_name);
+ n->plugin_name = GNUNET_strdup (plugin_name);
+ GNUNET_SCHEDULER_cancel (n->timeout_task);
+ n->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ &neighbour_timeout_task, n);
+ connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
+ connect_msg.header.type =
+ htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
+ connect_msg.reserved = htonl (0);
+ connect_msg.timestamp =
+ GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
+ GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &send_connect_continuation,
+ n);
+ /*
+ if (GNUNET_YES == was_connected)
+ return GNUNET_YES;
+ // First tell clients about connected neighbours...
+ neighbours_connected++;
+ GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
+ GNUNET_NO);
+ connect_notify_cb (callback_cls, peer, ats, ats_count);
+ return GNUNET_YES;*/
+ /* connection not yet up */
+ return GNUNET_NO;
+}
+
+
+/**
+ * Create an entry in the neighbour map for the given peer
+ *
+ * @param peer peer to create an entry for
+ * @return new neighbour map entry
+ */
+static struct NeighbourMapEntry *
+setup_neighbour (const struct GNUNET_PeerIdentity *peer)
+{
+ struct NeighbourMapEntry *n;
+
+#if DEBUG_TRANSPORT
+#endif
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Unknown peer `%s', creating new neighbour\n",
+ GNUNET_i2s (peer));
+
+ n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
+ n->id = *peer;
+ n->state = S_NOT_CONNECTED;
+ GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
+ GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
+ MAX_BANDWIDTH_CARRY_S);
+ n->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ &neighbour_timeout_task, n);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (neighbours,
+ &n->id.hashPubKey, n,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ return n;
+}
+
+
+/**
+ * Try to create a connection to the given target (eventually).
+ *
+ * @param target peer to try to connect to
+ */
+void
+GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
+{
+ struct NeighbourMapEntry *n;
+
+ GNUNET_assert (neighbours != NULL);
+#if DEBUG_TRANSPORT
+#endif
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Trying to connect to peer `%s'\n",
+ GNUNET_i2s (target));
+
+ GNUNET_assert (0 !=
+ memcmp (target, &GST_my_identity,
+ sizeof (struct GNUNET_PeerIdentity)));
+ n = lookup_neighbour (target);
+ if ((NULL != n) && (GNUNET_YES == n->is_connected))
+ return; /* already connected */
+
+ if ((NULL != n) && (n->state > S_NOT_CONNECTED))
+ return; /* already connecting */
+
+ if (n == NULL)
+ n = setup_neighbour (target);
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asking ATS for suggested address to connect to peer `%s'\n",
+ GNUNET_i2s (&n->id));
+#endif
+ GNUNET_ATS_suggest_address (GST_ats, &n->id);
+}
+
+
+/**
+ * Test if we're connected to the given peer.
+ *
+ * @param target peer to test
+ * @return GNUNET_YES if we are connected, GNUNET_NO if not
+ */
+int
+GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
+{
+ struct NeighbourMapEntry *n;
+
+ GNUNET_assert (neighbours != NULL);
+
+ n = lookup_neighbour (target);
+ if ((NULL == n) || (n->is_connected != GNUNET_YES))
+ return GNUNET_NO; /* not connected */
+ return GNUNET_YES;
+}
+
+
+/**
+ * A session was terminated. Take note.
+ *
+ * @param peer identity of the peer where the session died
+ * @param session session that is gone
+ */
+void
+GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
+ struct Session *session)
+{
+ struct NeighbourMapEntry *n;
+
+ GNUNET_assert (neighbours != NULL);
+
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Session %X to peer `%s' ended \n",
+ session, GNUNET_i2s (peer));
+#endif
+ n = lookup_neighbour (peer);
+ if (NULL == n)
+ return;
+ if (session != n->session)
+ return; /* doesn't affect us */
+
+ n->session = NULL;
+ GNUNET_free (n->addr);
+ n->addr = NULL;
+ n->addrlen = 0;
+
+
+ if (GNUNET_YES != n->is_connected)
+ return; /* not connected anymore anyway, shouldn't matter */
+ /* fast disconnect unless ATS suggests a new address */
+ GNUNET_SCHEDULER_cancel (n->timeout_task);
+ n->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
+ &neighbour_timeout_task, n);
+ /* try QUICKLY to re-establish a connection, reduce timeout! */
+ GNUNET_ATS_suggest_address (GST_ats, peer);
+}
+
+
+/**
+ * Transmit a message to the given target using the active connection.
+ *
+ * @param target destination
+ * @param msg message to send
+ * @param msg_size number of bytes in msg
+ * @param timeout when to fail with timeout
+ * @param cont function to call when done
+ * @param cont_cls closure for 'cont'
+ */
+void
+GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
+ size_t msg_size, struct GNUNET_TIME_Relative timeout,
+ GST_NeighbourSendContinuation cont, void *cont_cls)
+{
+ struct NeighbourMapEntry *n;
+ struct MessageQueue *mq;
+
+ GNUNET_assert (neighbours != NULL);
+
+ n = lookup_neighbour (target);
+ /* FIXME */
+ if ((n == NULL) /* || (GNUNET_YES != n->is_connected)*/)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# messages not sent (no such peer or not connected)"),
+ 1, GNUNET_NO);
+#if DEBUG_TRANSPORT
+ if (n == NULL)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Could not send message to peer `%s': unknown neighbor",
+ GNUNET_i2s (target));
+ else if (GNUNET_YES != n->is_connected)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Could not send message to peer `%s': not connected\n",
+ GNUNET_i2s (target));
+#endif
+ if (NULL != cont)
+ cont (cont_cls, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "GST_neighbours_send %u\n", __LINE__);
+ if ((n->session == NULL) && (n->addr == NULL) && (n->addrlen ==0))
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# messages not sent (no such peer or not connected)"),
+ 1, GNUNET_NO);
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Could not send message to peer `%s': no address available\n",
+ GNUNET_i2s (target));
+#endif
+
+ if (NULL != cont)
+ cont (cont_cls, GNUNET_SYSERR);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "GST_neighbours_send %u\n", __LINE__);
+ GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# bytes in message queue for other peers"),
+ msg_size, GNUNET_NO);
+ mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
+ mq->cont = cont;
+ mq->cont_cls = cont_cls;
+ /* FIXME: this memcpy can be up to 7% of our total runtime! */
+ memcpy (&mq[1], msg, msg_size);
+ mq->message_buf = (const char *) &mq[1];
+ mq->message_buf_size = msg_size;
+ mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
+ GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
+
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "GST_neighbours_send %u\n", __LINE__);
+
+ if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
+ (NULL == n->is_active))
+ n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
+}
+
+
+/**
+ * We have received a message from the given sender. How long should
+ * we delay before receiving more? (Also used to keep the peer marked
+ * as live).
+ *
+ * @param sender sender of the message
+ * @param size size of the message
+ * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
+ * GNUNET_NO if the neighbour is not connected or violates the quota,
+ * GNUNET_SYSERR if the connection is not fully up yet
+ * @return how long to wait before reading more from this sender
+ */
+struct GNUNET_TIME_Relative
+GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
+ *sender, ssize_t size, int *do_forward)
+{
+ struct NeighbourMapEntry *n;
+ struct GNUNET_TIME_Relative ret;
+
+ GNUNET_assert (neighbours != NULL);
+
+ n = lookup_neighbour (sender);
+ if (n == NULL)
+ {
+ GST_neighbours_try_connect (sender);
+ n = lookup_neighbour (sender);
+ if (NULL == n)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# messages discarded due to lack of neighbour record"),
+ 1, GNUNET_NO);
+ *do_forward = GNUNET_NO;
+ return GNUNET_TIME_UNIT_ZERO;
+ }
+ }
+ if (GNUNET_YES != n->is_connected)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Plugin gave us %d bytes of data but somehow the session is not marked as UP yet!\n"),
+ (int) size);
+ *do_forward = GNUNET_SYSERR;
+ return GNUNET_TIME_UNIT_ZERO;
+ }
+ if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
+ {
+ n->quota_violation_count++;
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
+ n->in_tracker.available_bytes_per_s__,
+ n->quota_violation_count);
+#endif
+ /* Discount 32k per violation */
+ GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
+ }
+ else
+ {
+ if (n->quota_violation_count > 0)
+ {
+ /* try to add 32k back */
+ GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
+ n->quota_violation_count--;
+ }
+ }
+ if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# bandwidth quota violations by other peers"),
+ 1, GNUNET_NO);
+ *do_forward = GNUNET_NO;
+ return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
+ }
+ *do_forward = GNUNET_YES;
+ ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
+ if (ret.rel_value > 0)
+ {
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
+ (unsigned long long) n->in_tracker.
+ consumption_since_last_update__,
+ (unsigned int) n->in_tracker.available_bytes_per_s__,
+ (unsigned long long) ret.rel_value);
+#endif
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# ms throttling suggested"),
+ (int64_t) ret.rel_value, GNUNET_NO);
+ }
+ return ret;
+}
+
+
+/**
+ * Keep the connection to the given neighbour alive longer,
+ * we received a KEEPALIVE (or equivalent).
+ *
+ * @param neighbour neighbour to keep alive
+ */
+void
+GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
+{
+ struct NeighbourMapEntry *n;
+
+ GNUNET_assert (neighbours != NULL);
+
+ n = lookup_neighbour (neighbour);
+ if (NULL == n)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# KEEPALIVE messages discarded (not connected)"),
+ 1, GNUNET_NO);
+ return;
+ }
+ GNUNET_SCHEDULER_cancel (n->timeout_task);
+ n->timeout_task =
+ GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ &neighbour_timeout_task, n);
+}
+
+
+/**
+ * Change the incoming quota for the given peer.
+ *
+ * @param neighbour identity of peer to change qutoa for
+ * @param quota new quota
+ */
+void
+GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
+ struct GNUNET_BANDWIDTH_Value32NBO quota)
+{
+ struct NeighbourMapEntry *n;
+
+ GNUNET_assert (neighbours != NULL);
+
+ n = lookup_neighbour (neighbour);
+ if (n == NULL)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop
+ ("# SET QUOTA messages ignored (no such peer)"),
+ 1, GNUNET_NO);
+ return;
+ }
+ GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
+ if (0 != ntohl (quota.value__))
+ return;
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
+ GNUNET_i2s (&n->id), "SET_QUOTA");
+#endif
+ if (GNUNET_YES == n->is_connected)
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# disconnects due to quota of 0"), 1,
+ GNUNET_NO);
+ disconnect_neighbour (n);
+}
+
+
+/**
+ * Closure for the neighbours_iterate function.
+ */
+struct IteratorContext
+{
+ /**
+ * Function to call on each connected neighbour.
+ */
+ GST_NeighbourIterator cb;
+
+ /**
+ * Closure for 'cb'.
+ */
+ void *cb_cls;
+};
+
+
+/**
+ * Call the callback from the closure for each connected neighbour.
+ *
+ * @param cls the 'struct IteratorContext'
+ * @param key the hash of the public key of the neighbour
+ * @param value the 'struct NeighbourMapEntry'
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct IteratorContext *ic = cls;
+ struct NeighbourMapEntry *n = value;
+
+ if (GNUNET_YES != n->is_connected)
+ return GNUNET_OK;
+
+ ic->cb (ic->cb_cls, &n->id, NULL, 0, n->plugin_name, n->addr, n->addrlen);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Iterate over all connected neighbours.
+ *
+ * @param cb function to call
+ * @param cb_cls closure for cb
+ */
+void
+GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
+{
+ struct IteratorContext ic;
+
+ GNUNET_assert (neighbours != NULL);
+
+ ic.cb = cb;
+ ic.cb_cls = cb_cls;
+ GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
+}
+
+
+/**
+ * If we have an active connection to the given target, it must be shutdown.
+ *
+ * @param target peer to disconnect from
+ */
+void
+GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
+{
+ struct NeighbourMapEntry *n;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+ struct SessionDisconnectMessage disconnect_msg;
+
+ GNUNET_assert (neighbours != NULL);
+
+ n = lookup_neighbour (target);
+ if (NULL == n)
+ return; /* not active */
+ if (GNUNET_YES == n->is_connected)
+ {
+ /* we're actually connected, send DISCONNECT message */
+ disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
+ disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
+ disconnect_msg.reserved = htonl (0);
+ disconnect_msg.purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
+ sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
+ sizeof (struct GNUNET_TIME_AbsoluteNBO) );
+ disconnect_msg.purpose.purpose = htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
+ disconnect_msg.timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
+ disconnect_msg.public_key = GST_my_public_key;
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
+ &disconnect_msg.purpose,
+ &disconnect_msg.signature));
+
+ papi = GST_plugins_find (n->plugin_name);
+ if (papi != NULL)
+ papi->send (papi->cls, target, (const void *) &disconnect_msg,
+ sizeof (disconnect_msg),
+ UINT32_MAX /* priority */ ,
+ GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
+ GNUNET_YES, NULL, NULL);
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# peers disconnected due to external request"), 1,
+ GNUNET_NO);
+ n = lookup_neighbour (target);
+ if (NULL == n)
+ return; /* gone already */
+ }
+ disconnect_neighbour (n);
+}
+
+
+/**
+ * We received a disconnect message from the given peer,
+ * validate and process.
+ *
+ * @param peer sender of the message
+ * @param msg the disconnect message
+ */
+void
+GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *msg)
+{
+ struct NeighbourMapEntry *n;
+ const struct SessionDisconnectMessage *sdm;
+ GNUNET_HashCode hc;
+
+ if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
+ {
+ // GNUNET_break_op (0);
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# disconnect messages ignored (old format)"), 1,
+ GNUNET_NO);
+ return;
+ }
+ sdm = (const struct SessionDisconnectMessage* ) msg;
+ n = lookup_neighbour (peer);
+ if (NULL == n)
+ return; /* gone already */
+ if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <=
+ n->connect_ts.abs_value)
+ {
+ GNUNET_STATISTICS_update (GST_stats,
+ gettext_noop ("# disconnect messages ignored (timestamp)"), 1,
+ GNUNET_NO);
+ return;
+ }
+ GNUNET_CRYPTO_hash (&sdm->public_key,
+ sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
+ &hc);
+ if (0 != memcmp (peer,
+ &hc,
+ sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (ntohl (sdm->purpose.size) !=
+ sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
+ sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
+ sizeof (struct GNUNET_TIME_AbsoluteNBO))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CRYPTO_rsa_verify (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT,
+ &sdm->purpose,
+ &sdm->signature,
+ &sdm->public_key))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ GST_neighbours_force_disconnect (peer);
+}
+
+static void neighbour_connected (struct NeighbourMapEntry *n,
+ const struct GNUNET_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ /* LEGACY */
+ int was_connected;
+ was_connected = n->is_connected;
+ n->is_connected = GNUNET_YES;
+ /* END LEGACY */
+
+ if (GNUNET_YES != was_connected)
+ n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
+ &neighbour_keepalive_task,
+ n);
+ if (n->state == S_CONNECTED)
+ return;
+ // First tell clients about connected neighbours...
+ //change_state (n, S_CONNECTED);
+
+ neighbours_connected++;
+ GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
+ GNUNET_NO);
+ connect_notify_cb (callback_cls, &n->id, ats, ats_count);
+}
+
+
+/**
+ * We received a 'SESSION_CONNECT_ACK' message from the other peer.
+ * Consider switching to it.
+ *
+ * @param message possibly a 'struct SessionConnectMessage' (check format)
+ * @param peer identity of the peer to switch the address for
+ * @param plugin_name name of transport that delivered the PONG
+ * @param address address of the other peer, NULL if other peer
+ * connected to us
+ * @param address_len number of bytes in address
+ * @param session session to use (or NULL)
+ * @param ats performance data
+ * @param ats_count number of entries in ats
+ */
+void
+GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_PeerIdentity *peer,
+ const char *plugin_name,
+ const char *sender_address, uint16_t sender_address_len,
+ struct Session *session,
+ const struct GNUNET_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ const struct SessionConnectMessage *scm;
+ struct GNUNET_TIME_Absolute ts;
+ struct NeighbourMapEntry *n;
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "GST_neighbours_handle_connect_ack\n");
+ if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ scm = (const struct SessionConnectMessage *) message;
+ GNUNET_break_op (ntohl (scm->reserved) == 0);
+ ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
+ n = lookup_neighbour (peer);
+ if (NULL == n)
+ n = setup_neighbour (peer);
+
+ if (n->state != S_CONNECT_SENT)
+ {
+ GNUNET_break (0);
+ return;
+ }
+
+ change_state (n, S_CONNECTED);
+ neighbour_connected (n, ats, ats_count);
+}
+
+
+/**
+ * We received a 'SESSION_CONNECT' message from the other peer.
+ * Consider switching to it.
+ *
+ * @param message possibly a 'struct SessionConnectMessage' (check format)
+ * @param peer identity of the peer to switch the address for
+ * @param plugin_name name of transport that delivered the PONG
+ * @param address address of the other peer, NULL if other peer
+ * connected to us
+ * @param address_len number of bytes in address
+ * @param session session to use (or NULL)
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+ */
+void
+GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_PeerIdentity *peer,
+ const char *plugin_name,
+ const char *sender_address, uint16_t sender_address_len,
+ struct Session *session,
+ const struct GNUNET_ATS_Information *ats,
+ uint32_t ats_count)
+{
+ const struct SessionConnectMessage *scm;
+ struct GNUNET_TIME_Absolute ts;
+ struct NeighbourMapEntry *n;
+ struct SessionConnectMessage connect_msg;
+ struct GNUNET_TRANSPORT_PluginFunctions *papi;
+ int ret;
+
+ if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ scm = (const struct SessionConnectMessage *) message;
+ GNUNET_break_op (ntohl (scm->reserved) == 0);
+ ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
+ n = lookup_neighbour (peer);
+ if (NULL == n)
+ n = setup_neighbour (peer);
+
+ if (n->state > S_NOT_CONNECTED)
+ return;
+
+ change_state (n, S_CONNECT_RECV);
+ /* send CONNECT_ACK */
+ connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
+ connect_msg.header.type =
+ htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
+ connect_msg.reserved = htonl (0);
+ connect_msg.timestamp =
+ GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
+
+ papi = GST_plugins_find (plugin_name);
+ ret = papi->send (papi->cls, &n->id, (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
+ 0,
+ GNUNET_TIME_UNIT_FOREVER_REL, NULL, sender_address, sender_address_len, GNUNET_YES,
+ NULL, NULL);
+
+ if (ret == GNUNET_SYSERR)
+ {
+ change_state (n, S_NOT_CONNECTED);
+ GNUNET_break (0);
+ return;
+ }
+
+ if (ts.abs_value > n->connect_ts.abs_value)
+ {
+ if (NULL != session)
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
+ "transport-ats",
+ "Giving ATS session %p of plugin %s for peer %s\n",
+ session,
+ plugin_name,
+ GNUNET_i2s (peer));
+ GNUNET_ATS_address_update (GST_ats,
+ peer,
+ plugin_name, sender_address, sender_address_len,
+ session, ats, ats_count);
+ n->connect_ts = ts;
+ }
+}
+
+
+/* end of file gnunet-service-transport_neighbours.c */
projects / oweals / gnunet.git / commitdiff