From b9c87498868c88745df077108be224bf3771a6e3 Mon Sep 17 00:00:00 2001 From: Matthias Wachs Date: Tue, 25 Oct 2011 16:36:01 +0000 Subject: [PATCH] work in progress - neighbour management based on a FSM - 3-way connect handshake --- .../gnunet-service-transport_neighbours_fsm.c | 1588 +++++++++++++++++ 1 file changed, 1588 insertions(+) create mode 100644 src/transport/gnunet-service-transport_neighbours_fsm.c diff --git a/src/transport/gnunet-service-transport_neighbours_fsm.c b/src/transport/gnunet-service-transport_neighbours_fsm.c new file mode 100644 index 000000000..f9794967a --- /dev/null +++ b/src/transport/gnunet-service-transport_neighbours_fsm.c @@ -0,0 +1,1588 @@ +/* + 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) ? "" : 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 */ -- 2.25.1